WO2020133681A1

WO2020133681A1 - Heating control method for power battery pack, and control system and automobile

Info

Publication number: WO2020133681A1
Application number: PCT/CN2019/076742
Authority: WO
Inventors: 吴建政
Original assignee: 北京宝沃汽车有限公司
Priority date: 2018-12-24
Filing date: 2019-03-01
Publication date: 2020-07-02
Also published as: DE112019006385T5; CN111355002A

Abstract

A heating control method for a power battery pack, and a control system and an automobile. The heating control method comprises: detecting a temperature difference of each power battery module in real time, wherein the temperature difference is determined by a difference value between the highest temperature and the lowest temperature of power battery cells in each power battery module in an initial unheated state; and determining, according to an increased amplitude of the temperature difference or the temperature difference, an adjustment method corresponding to each power battery module.

Description

Power battery pack heating control method, control system and automobile

Cross-reference of related applications

This application requires the priority of the Chinese patent application number "201811585166.9" filed by Beijing Baowo Automobile Co., Ltd. on December 24, 2018, with the invention titled "Power Battery Pack Heating Control Method, Control System and Power Vehicle" , The entire content of which is incorporated by reference in this application.

Technical field

The present disclosure relates to the field of power cars, and in particular, to a heating control method, control system and car for a power battery pack.

Background technique

Lithium-ion batteries have become the first choice for power batteries in electric vehicles due to many advantages. However, lithium-ion batteries have limited charging capacity in low-temperature environments, and heating measures must be taken to recharge to a reasonable charging temperature or recharge the lithium-ion batteries while heating the lithium-ion batteries. On the one hand, this heating measure can avoid the hidden danger of low-temperature charging, on the other hand, it can also effectively shorten the charging time. However, even so, taking heating measures still has the following technical defects: the heating circuit structure of the power battery module is easy to cause low heating efficiency and uneven heating problems, and charging under heating in a low temperature environment still requires a long time After heating, the temperature difference of the power battery module is large, and the energy consumption required for heating is high. For example, in an ideal situation, it is recommended that the maximum temperature difference of the power battery module be controlled within 5°C (preferably within 3°C), but in actual testing, a temperature difference of 8 to 10°C or even higher often occurs.

Therefore, the charging and heating scheme for lithium-ion batteries in low-temperature environments is an urgent technical problem to be solved in the field of pure electric vehicles. For this reason, in the low-temperature charging heating temperature difference control, the related technology provides the following two improved technical solutions:

Option one, usually optimize the mechanical structure of the heating circuit to achieve the temperature difference control of low temperature charging and heating. By heating the power battery module evenly during heating, the temperature difference of the power battery module after charging is reduced. However, the solution still has the following defects: increased production costs, and the size of the vehicle structure or battery pack structure cannot be changed.

Solution 2: Based on the heating characteristics of the heater to control the heating level, that is, based on the temperature control of the water inlet of the power battery module, when the water inlet temperature reaches a set threshold, the heating power is reduced, while the water inlet When the temperature drops to another set threshold, heating power is restored again. However, the technical defect of this solution is that the control is mainly based on the heating characteristics of the heater, the variable is single, the heating characteristics of the actual power battery module are not fully considered, and the temperature difference control effect is poor.

Based on the above analysis, under low temperature environment, the charging performance of lithium electronic power batteries will deteriorate sharply. At this time, if the heating function is not turned on, although the minimum temperature difference of the power battery module can be reasonably controlled, the charging time is longer due to the smaller actual charging current. If the heating function is turned on, the charging heating method provided in the related art still has the following technical defects:

(1) When the difference between the initial temperature of the power battery module and the heating stop threshold is large, the heating power level cannot be reasonably controlled. If the heating at the higher heating power level is continued, the temperature of the water will rise rapidly, which eventually makes the heating During the process, the temperature difference of the power battery module keeps increasing.

(2) Since the heating power level cannot be reasonably controlled, there will be a phenomenon that the temperature difference of the power battery module continues to rise after the heating is stopped, which wastes energy on the one hand and extends the thermal balance of the power battery module on the other time.

(3) During the charging process, if only the heating gear is adjusted according to the characteristics of the heater itself, the temperature difference of the power battery module cannot be effectively controlled.

In view of the above problems, no effective solution has been proposed yet.

Summary of the invention

The present disclosure adopts the following technical solutions:

At least some embodiments of the present disclosure provide a heating battery pack heating control method, control system, and power car to at least solve the problem that the heating and charging method provided for the lithium electronic power battery cannot reasonably control heating in a low temperature environment in the related art The heating method of the device not only prolongs the heat balance time of the power battery module but also increases the technical problems of charging and heating costs.

According to one embodiment of the present disclosure, a heating control method for a power battery pack is provided. The power battery pack includes: at least one power battery module; the method includes:

Real-time detection of the temperature difference of each power battery module, where the temperature difference is determined by the difference between the maximum temperature and the minimum temperature of the power battery cell in each power battery module in the initial unheated state; according to the increase of the temperature difference or the temperature difference Determine the corresponding adjustment method for each power battery module.

In some embodiments, determining the adjustment method corresponding to each power battery module according to the increase includes: when the increase reaches the first preset threshold, the heating power level of the heater is adjusted from the first level to the second level , And continue to heat at least one power battery module, where the first level and the second level differ by one level; when the increase does not reach the first preset threshold, the first level is maintained for at least one power battery Heating the module; or, when the increase reaches the second preset threshold, lower the heating power level of the heater from the second level to the third level, and continue to heat at least one power battery module, wherein, The second preset threshold is greater than the first preset threshold, and there is a difference between the second level and the third level; when the increase does not reach the second preset threshold, the second level is maintained at the second level for at least one power battery module Heating; or, when the increase reaches the third preset threshold, stop heating at least one power battery module, wherein the third preset threshold is greater than the second preset threshold; when the increase does not reach the third preset threshold At the time, keep at the third level to heat at least one power battery module.

In some embodiments, after the heating of the at least one power battery module is stopped, the method further includes: when the water temperature of the circulating water circuit of the at least one power battery module is lower than the fourth preset threshold or the increase range does not reach the third preset At the threshold, restart the heater to heat the at least one power battery module using the third level.

In some embodiments, when the power battery pack includes multiple power battery modules, determining the corresponding adjustment method for each power battery module according to the temperature difference includes: when the temperature difference is greater than a fifth preset threshold, according to each power battery module Group temperature grouping multiple power battery modules to obtain multiple groups of power battery modules, in which the temperature of power battery modules in the same group is in the same temperature range, and different groups of power battery modules correspond to different temperatures Interval; using different heating power levels to heat multiple sets of power battery modules, in which the same group of power battery modules use the same heating power level, between different sets of power battery modules, the critical value of the temperature interval The higher, the lower the heating power level used by the power battery modules in the corresponding group.

In some embodiments, before detecting the temperature difference of each power battery module in real time, the method further includes: acquiring an initial temperature of at least one power battery module, wherein the initial temperature is each power battery module in an unheated initial state The minimum temperature of the power battery cell in; when the initial temperature is lower than the sixth preset threshold, determine the corresponding heating method according to the temperature range where the initial temperature is located; and heat at least one power battery module according to the heating method.

In some embodiments, before determining the corresponding heating method according to the temperature interval where the initial temperature is, it further includes: dividing a plurality of temperature intervals within a temperature range less than the sixth preset threshold according to a preset heating accuracy requirement, wherein, Each temperature interval corresponds to a different heating power level, and the greater the difference between the critical value of each temperature interval and the sixth preset threshold, the lower the corresponding heating power level.

In some embodiments, determining the corresponding heating mode according to the temperature interval where the initial temperature is located includes: determining the heating power level of the heater according to the temperature interval where the initial temperature is located; obtaining the corresponding heating power value through the heating power level; Heating the at least one power battery module includes: controlling the heater to heat the at least one power battery module using the heating power value.

In some embodiments, after heating the at least one power battery module according to the heating method, the method further includes: detecting in real time whether the initial temperature is greater than or equal to the sixth preset threshold in the heating state, and determining that the initial temperature is greater than or equal to At the sixth preset threshold, the heating of at least one power battery module is stopped.

According to one embodiment of the present disclosure, there is also provided a power battery pack heating control system, the power battery pack heating control system is used to execute any one of the above-mentioned power battery pack heating control methods.

According to one of the embodiments of the present disclosure, there is also provided a power automobile, including: the heating control system of the power battery pack described above.

In at least some embodiments of the present disclosure, the temperature difference of each power battery module is detected in real time. The temperature difference is determined by the difference between the highest temperature and the lowest temperature of the power battery cell in each power battery module in the initial unheated state. The determination method is to determine the adjustment method corresponding to each power battery module through the increase of the temperature difference or the temperature difference, so as to achieve the purpose of reasonably determining the adjustment method corresponding to each power battery module according to the increase of the temperature difference or the temperature difference, so as to achieve The technical effect of reducing the heat balance time of the power battery module and the cost of charging and heating is reduced, which further solves the problem that the heating and charging method provided for the lithium electronic power battery cannot reasonably control the heating method of the heater in the low temperature environment in the related art. It not only extends the thermal equilibrium time of the power battery module but also increases the technical problems of charging and heating costs.

BRIEF DESCRIPTION

The drawings described herein are used to provide a further understanding of the present disclosure and form a part of the present application. The exemplary embodiments and descriptions of the present disclosure are used to explain the present disclosure and do not constitute an undue limitation on the present disclosure. In the drawings:

1 is a hardware block diagram of a heating control system of a power battery pack according to one embodiment of the present disclosure;

2 is a flowchart of a heating control method of a power battery pack according to one embodiment of the present disclosure;

3 is a structural block diagram of a heating control device for a power battery pack according to one embodiment of the present disclosure;

4 is a structural block diagram of a heating control device for a power battery pack according to one of the alternative embodiments of the present disclosure.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be described clearly and completely in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only It is a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present disclosure.

It should be noted that the terms “first”, “second”, etc. in the specification and claims of the present disclosure and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way are interchangeable under appropriate circumstances so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, processes, methods, systems, products or devices that contain a series of steps or units are not necessarily limited to those clearly listed Those steps or units, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or equipment.

According to one of the embodiments of the present disclosure, an embodiment of a heating control method for a power battery pack is provided. It should be noted that the steps shown in the flowchart in the drawings may be implemented in a computer system such as a set of computer-executable instructions. , And although the logical sequence is shown in the flowchart, in some cases, the steps shown or described may be performed in an order different from here.

This method embodiment may be implemented in an electric vehicle, which is provided with a heating control system of a power battery pack. FIG. 1 is a hardware block diagram of a heating control system of a power battery pack according to one embodiment of the present disclosure. As shown in FIG. 1, the heating control system of the power battery pack may include: a vehicle processor and at least one power battery module (Only one power battery module is used as an example for illustration), heater and heater controller. In some embodiments, the above electric vehicle may further include a memory for storing data, a transmission device for a communication function, and an input and output device. A person of ordinary skill in the art may understand that the structure shown in FIG. 1 is merely an illustration, which does not limit the structure of the heating control system of the power battery pack described above. For example, the heating control system of the power battery pack may further include more or fewer components than those shown in FIG. 1, or have a configuration different from that shown in FIG.

The memory can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the heating control method of the power battery pack in the embodiments of the present disclosure, and the processor executes the computer program stored in the memory to execute Various functional applications and data processing, that is, to realize the above-mentioned heating control method of the power battery pack. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory may further include memories remotely set with respect to the vehicle controller, and these remote memories may be connected to the heating control system of the power battery pack through a network. Examples of the aforementioned network include, but are not limited to, the Internet, intranet, local area network, mobile communication network, and combinations thereof.

The transmission device is used to receive or send data via a network. The specific example of the network described above may include a wireless network provided by a communication supplier of electric vehicles. In one example, the transmission device includes a network adapter (Network Interface Controller, referred to as NIC for short), which can be connected to other network devices through the base station to communicate with the Internet. In one example, the transmission device may be a radio frequency (Radio Frequency, RF for short) module, which is used to communicate with the Internet in a wireless manner.

In this embodiment, a heating control method for a power battery pack of a vehicle controller running in the heating control system of the power battery pack is provided. The power battery pack includes: at least one power battery module. FIG. 2 is a flowchart of a heating battery pack heating control method according to one embodiment of the present disclosure. As shown in FIG. 2, the method includes the following steps:

Step S23, detecting the temperature difference of each power battery module in real time, wherein the temperature difference is determined by the difference between the highest temperature and the lowest temperature of the power battery cell in each power battery module in the initial unheated state;

In step S24, the adjustment mode corresponding to each power battery module is determined according to the increase range of the temperature difference or the temperature difference.

Through the above steps, the temperature difference of each power battery module is detected in real time. The temperature difference is determined by the difference between the highest temperature and the lowest temperature of the power battery cell in each power battery module in the initial unheated state. The increase of the temperature difference or the temperature difference determines the corresponding adjustment method of each power battery module, which achieves the purpose of reasonably determining the adjustment method of each power battery module according to the increase of the temperature difference or the temperature difference, thereby reducing the power battery module The heat balance time of the group, the technical effect of reducing the cost of charging and heating, and thus solving the related art. In the low temperature environment, the heating and charging method provided for the lithium electronic power battery cannot reasonably control the heating method of the heater, not only extending the power battery mode Group heat balance time and increase the technical problems of charging and heating costs.

The above-mentioned power battery module refers to a combination of power battery cells connected in series or parallel and adding a protective circuit board and a housing, which can directly provide electric energy.

After obtaining the temperature value of each power battery cell in each power battery module in the initial unheated state, assuming that the minimum temperature in each power battery cell is T _min and the maximum temperature is T _max , then each power The initial temperature difference ΔT ₀ =T _max -T _{min of the} battery module. After controlling the heater to heat each power battery module with the heating power value, the increase of ΔT ₀ is detected in real time, and a corresponding adjustment strategy is taken according to the increase, and then based on the The real-time detection results of the temperature difference generated during the heating process flexibly adopt corresponding adjustment strategies (for example: adjust the current heating power level), which not only helps to reduce the thermal equilibrium time of each power battery module, but also reduces charging Heating costs.

In some embodiments, in step S24, determining the corresponding adjustment mode according to the increase in temperature difference may include the following execution steps:

Step S241, when the increase reaches the first preset threshold, lower the heating power level of the heater from the first level to the second level, and continue to heat at least one power battery module, wherein the first level is equal to There is a difference between the second levels; when the increase does not reach the first preset threshold, the first level is maintained to heat at least one power battery module.

Assuming that the heating power level of the heater determined according to the temperature range where the initial temperature is located is the Nth (N is a positive integer) gear, it is detected in real time whether the initial temperature difference ΔT _{0 of} each power battery module increases during the heating process. If ΔT ₁ (ie the above-mentioned first preset threshold) is further increased on the basis of the initial temperature difference ΔT ₀ of each power battery module, the heating power level of the control heater is adjusted from the Nth gear to the Nth gear -1 gear and continue to heat each power battery module, otherwise, maintain the Nth gear to heat each power battery module.

Step S242, when the increase reaches the second preset threshold, lower the heating power level of the heater from the second level to the third level, and continue to heat at least one power battery module, wherein the second preset The threshold is greater than the first preset threshold, and there is a difference between the second level and the third level; when the increase does not reach the second preset threshold, the second level is maintained to heat at least one power battery module.

After controlling the heating power level of the heater to be lowered from the Nth gear to the N-1th gear and continuing to heat each power battery module, the initial temperature difference △T of each power battery module is detected in real time during the heating process Whether ₀ increases. If ΔT ₂ (ie the above second preset threshold) is further increased on the basis of the initial temperature difference ΔT ₀ of each power battery module, the heating power level of the control heater is adjusted from the N-1th gear to Gear N-2 and continue to heat each power battery module, otherwise, keep heating power of each power battery module in gear N-1.

Step S243, when the increase reaches the third preset threshold, stop heating at least one power battery module, wherein the third preset threshold is greater than the second preset threshold; when the increase does not reach the third preset threshold , Keep at the third level to heat at least one power battery module.

After controlling the heating power level of the heater to be lowered from the N-1th gear to the N-2th gear and continuing to heat each power battery module, the initial temperature difference of each power battery module is detected in real time during the heating process Whether △T ₀ increases. If △T ₃ is further increased on the basis of the initial temperature difference ΔT ₀ of each power battery module (that is, the above third preset threshold), the heater is controlled to stop heating each power battery module, otherwise, Maintain the N-2 gear to heat each power battery module.

In some embodiments, in step S243, after stopping heating the at least one power battery module, the following execution steps may be further included:

Step S244, when the water temperature of the circulating water channel of the at least one power battery module is lower than the fourth preset threshold or the increase range does not reach the third preset threshold, restart the heater to perform the third level on the at least one power battery module heating.

After controlling the heater to stop heating each power battery module, it is still necessary to detect the circulating water temperature of each power battery module or the temperature difference of each power battery module in real time. If the temperature of the circulating water circuit of each power battery module is reduced to the fourth preset threshold or the temperature difference of the power battery module is reduced to within △T ₃ , the heater is controlled to turn on the heating function again, and the heating power level used is the first N-2 gear to achieve reasonable temperature difference control.

It should be noted that the above △T ₁ , △T ₂ , △T ₃ can be tested and calibrated according to reference factors such as the temperature rise characteristics of at least one power battery module and the heating power level of the heater to achieve a good charging and heating effect .

In some embodiments, when the power battery pack includes multiple power battery modules, in step S24, determining the corresponding adjustment mode according to the temperature difference may include the following execution steps:

Step S245: When the temperature difference is greater than the fifth preset threshold, group multiple power battery modules according to the temperature of each power battery module to obtain multiple sets of power battery modules, wherein the power battery modules in the same group The temperature of the group is in the same temperature range, and different groups of power battery modules correspond to different temperature ranges;

Step S246: heating multiple sets of power battery modules with different heating power levels, wherein the power battery modules in the same group use the same heating power level, and the temperature interval is critical between different sets of power battery modules The higher the value, the lower the heating power level used by the power battery modules in the corresponding group.

The temperature of each power battery module may include one of the following: the maximum temperature of power battery cells in each power battery module, the minimum temperature of power battery cells in each power battery module, and each power The average of the highest temperature and the lowest temperature of the power battery cells in the battery module. Just use the same temperature standard to determine the temperature of each power battery module.

When there are multiple power battery modules in the power battery pack and the temperature difference can be determined to be greater than the fifth preset threshold, the multiple power battery modules need to be grouped according to the temperature of each power battery module to obtain multiple sets of power Battery module. The temperature of the power battery modules in the same group is in the same temperature interval, and the power battery modules in different groups correspond to different temperature intervals. Further, the power battery modules in the same group use the same heating power level. That is, the power battery modules in the same group are heated with the same heating power value. Between different groups of power battery modules, the higher the critical value of the temperature interval, the lower the heating power level used by the power battery modules in the corresponding group. That is, the higher the temperature interval, the lower the heating power value used by the power battery modules in the group corresponding to the temperature interval.

In some embodiments, in step S23, before detecting the temperature difference of each power battery module in real time, the following execution steps may also be included:

Step S20: Acquire the initial temperature of at least one power battery module, where the initial temperature is the lowest temperature of the power battery cell in each power battery module in the unheated initial state;

Step S21, when the initial temperature is lower than the sixth preset threshold, determine the corresponding heating mode according to the temperature interval where the initial temperature is located;

Step S22, heating at least one power battery module according to a heating method.

Through the above steps, the initial temperature of at least one power battery module can be obtained. The initial temperature is the lowest temperature of the power battery cells in each power battery module in the unheated initial state. In the case of the sixth preset threshold, the corresponding heating method is determined according to the temperature interval where the initial temperature is located, and at least one power battery module is heated according to the heating method, so that the heater is reasonably controlled according to the temperature interval where the initial temperature is located The purpose of the heating method used.

In an alternative embodiment, first, the temperature value of each power battery cell in the power battery module in the initial unheated state is obtained; second, by comparing the temperature values of the individual power battery cells, the power battery cell The minimum temperature of is determined as the initial temperature of the power battery module; then, it is detected in real time whether the initial temperature is lower than the temperature T (that is, the above sixth preset threshold), if it is, the vehicle controller needs to send heating to the heater controller Request message to enable the heater controller to control the heater to start the heating function

In some embodiments, in step S21, before determining the corresponding heating mode according to the temperature range where the initial temperature is, the following execution steps may also be included:

Step S25: Divide a plurality of temperature intervals within a temperature range less than the sixth preset threshold according to the preset heating accuracy requirements, where each temperature interval corresponds to a different heating power level, and the critical value of each temperature interval is equal to The larger the difference of the sixth preset threshold, the lower the corresponding heating power level.

According to the preset heating accuracy requirements, the temperature range is flexibly divided within the temperature range less than T. The higher the preset heating accuracy requirement, the more temperature zones are divided, and the more corresponding heating power levels are. For example: for the case where the preset heating accuracy is high, the temperature range defined by it may include, but not limited to: ..., [T-6, T-4), [T-4, T-2), [ T-2,T). For the case where the preset heating accuracy requirement is low, the temperature range defined by it may include but not limited to: ..., [T-30, T-20), [T-20, T-10), [T- 10, T).

In an optional embodiment, the temperature interval divided within the temperature range less than T according to the preset heating accuracy requirements may include, but not limited to: ..., [T-15, T-10), [T-10, T -5), [T-5,T).

After controlling the heater to turn on the charging function, if the initial temperature is within the range of [T-5, T), the heater is controlled to heat the at least one power battery module at a higher power level; if the initial temperature is [T-10 , T-5), the heater is controlled to heat at least one power battery module at a medium power level; if the initial temperature is within the [T-15, T-10) interval, the heater is controlled to a lower power The level heats at least one power battery module. And so on.

In some embodiments, in step S21, determining the corresponding heating method according to the temperature interval where the initial temperature is located may include the following execution steps:

Step S211: Determine the heating power level of the heater according to the temperature interval where the initial temperature is located;

Step S212: Obtain the corresponding heating power value by the heating power level.

In the case where each power battery module is in the charging mode, the determination is reasonable based on the temperature range where the initial temperature of each power battery module is located (that is, the difference between the initial temperature of each power battery module and the temperature T) Heating power level to slow down the growth rate of water temperature, thus effectively avoiding the phenomenon that the actual temperature difference of each power battery module increases continuously due to the large difference between the water temperature and the temperature of each power battery module, and then reaches Each power battery module slows down the life of each power battery module while increasing its temperature.

In some embodiments, in step S22, heating the at least one power battery module according to the heating mode may include the following execution steps:

In step S221, the heater is controlled to heat the at least one power battery module using the heating power value.

After dividing a plurality of temperature intervals within the temperature range less than the sixth preset threshold according to the preset heating accuracy requirements, since each heating power level corresponds to a different heating power value, if the temperature can be based on the temperature at the initial temperature If the heating power level of the heater is determined in the interval, the corresponding heating power value can be obtained through the heating power level, and then the heater can be controlled to heat at least one power battery module according to the determined heating power value.

In some embodiments, in step S22, after heating the at least one power battery module according to the heating mode, the following execution steps may be further included:

In step S26, it is detected in real time whether the initial temperature in the heating state is greater than or equal to the sixth preset threshold, and when it is determined that the initial temperature is greater than or equal to the sixth preset threshold, the heating of the at least one power battery module is stopped.

In the process of controlling the heater to heat at least one power battery module, not only the real-time detection and detection of the increase of ΔT ₀ and corresponding adjustment strategies are required according to the increase, but also the real-time detection of the minimum power battery Whether the temperature is greater than or equal to the temperature T. If it can be determined that the minimum temperature of the power battery cell is greater than or equal to the temperature T, the heater needs to be controlled to stop heating the at least one power battery module and simply charge the at least one power battery module.

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware, but in many cases the former is Better implementation. Based on such an understanding, the technical solution of the present disclosure can be embodied in the form of a software product in essence or part that contributes to the existing technology, and the computer software product is stored in a storage medium (such as ROM/RAM, magnetic disk, The CD-ROM includes several instructions to enable a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the embodiments of the present disclosure.

In this embodiment, a heating control device for a power battery pack is also provided. The power battery pack includes: at least one power battery module. This device is used to implement the above-mentioned embodiments and preferred implementations, and those that have already been described will not be repeated. As used below, the term "module" may implement a combination of software and/or hardware that performs predetermined functions. Although the devices described in the following embodiments are preferably implemented in software, implementation of hardware or a combination of software and hardware is also possible and conceived.

3 is a structural block diagram of a heating control device for a power battery pack according to one embodiment of the present disclosure. As shown in FIG. 3, the device includes: a first detection module 10 for detecting the temperature difference of each power battery module in real time , Where the temperature difference is determined by the difference between the highest temperature and the lowest temperature of the power battery cells in each power battery module in the initial unheated state; the control module 20 is used to determine each power according to the increase in temperature difference or the temperature difference The corresponding adjustment mode of the battery module.

In some embodiments, the control module 20 is used to decrease the heating power level of the heater from the first level to the second level when the increase reaches the first preset threshold, and continue to control at least one power battery module Perform heating, where the first level and the second level differ by one level; when the increase does not reach the first preset threshold, keep at the first level to heat at least one power battery module; or, when the increase When the second preset threshold is reached, the heating power level of the heater is lowered from the second level to the third level, and heating of at least one power battery module is continued, wherein the second preset threshold is greater than the first preset Threshold, a difference between the second level and the third level; when the increase does not reach the second preset threshold, keep the second level to heat at least one power battery module; or, when the increase reaches the third Stop heating the at least one power battery module when the preset threshold is reached, where the third preset threshold is greater than the second preset threshold; when the increase does not reach the third preset threshold, it remains at the third level for at least one The power battery module is heated.

In some embodiments, the control module 20 is further configured to restart the heater by using the first method when the water temperature of the circulating water circuit of the at least one power battery module is lower than the fourth preset threshold or the increase range does not reach the third preset threshold. Three levels heat at least one power battery module.

In some embodiments, the control module 20 is also used to control the plurality of power battery modules according to the temperature of each power battery module when the power battery pack includes multiple power battery modules and the temperature difference is greater than a fifth preset threshold Group processing to obtain multiple sets of power battery modules, in which the temperature of power battery modules in the same group is in the same temperature range, different groups of power battery modules correspond to different temperature intervals; and different heating power levels are used Multiple groups of power battery modules are heated. Among them, the power battery modules in the same group use the same heating power level. Between different groups of power battery modules, the higher the critical value of the temperature interval, the corresponding power batteries in the group The lower the heating power level used by the module.

In some embodiments, FIG. 4 is a structural block diagram of a heating control device for a power battery pack according to an alternative embodiment of the present disclosure. As shown in FIG. 4, the device includes all the modules shown in FIG. The method includes: an acquisition module 30 for acquiring an initial temperature of at least one power battery module, wherein the initial temperature is the lowest temperature of the power battery cells in each power battery module in an unheated initial state; the determination module 40, It is used to determine the corresponding heating mode according to the temperature range where the initial temperature is when the initial temperature is lower than the sixth preset threshold; the heating module 50 is used to heat at least one power battery module according to the heating mode.

In some embodiments, as shown in FIG. 4, the above-mentioned device further includes: a dividing module 60, configured to divide a plurality of temperature intervals within a temperature range less than a sixth preset threshold according to a preset heating accuracy requirement, wherein each Each temperature interval corresponds to a different heating power level, and the greater the difference between the critical value of each temperature interval and the sixth preset threshold, the lower the corresponding heating power level.

In some embodiments, the determination module 40 is used to determine the heating power level of the heater according to the temperature range where the initial temperature is located, and to obtain the corresponding heating power value through the heating power level; the heating module 50 is used to control the heater to use heating The power value heats at least one power battery module.

In some embodiments, as shown in FIG. 4, the above-mentioned device further includes: a second detection module 70, configured to detect in real time whether the initial temperature is greater than or equal to the sixth preset threshold in the heating state, and determine that the initial temperature is greater than or equal to When it is equal to the sixth preset threshold, the heating of the at least one power battery module is stopped.

It should be noted that the above modules can be implemented by software or hardware, and the latter can be implemented by the following methods, but not limited to this: the above modules are all located in the same processor; or, the above modules can be combined in any combination The forms are located in different processors.

The sequence numbers of the above-mentioned embodiments of the present disclosure are for description only, and do not represent the merits of the embodiments.

In the above embodiments of the present disclosure, the description of each embodiment has its own emphasis. For a part that is not detailed in an embodiment, you can refer to the related descriptions of other embodiments.

In the several embodiments provided in this application, it should be understood that the disclosed technical content may be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the unit may be a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or may Integration into another system, or some features can be ignored, or not implemented. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, units or modules, and may be in electrical or other forms.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or software function unit.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present disclosure essentially or part of the contribution to the existing technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , Including several instructions to enable a computer device (which may be a personal computer, server, network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present disclosure. The aforementioned storage media include: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program code .

A power battery pack heating control method, the power battery pack includes: at least one power battery module; the method includes: real-time detection of the temperature difference of each power battery module, wherein the temperature difference is from the initial unheated state The difference between the highest temperature and the lowest temperature of the power battery cell in each power battery module is determined; the adjustment mode corresponding to each power battery module is determined according to the increase range of the temperature difference or the temperature difference.

Determining the adjustment method corresponding to each power battery module according to the increase amplitude includes: when the increase amplitude reaches the first preset threshold, lower the heating power level of the heater from the first level to the second level, and Continue to heat the at least one power battery module, wherein the first level and the second level differ by one level; when the increase does not reach the first preset threshold, keep at The first level heats the at least one power battery module; or, when the increase reaches the second preset threshold, the heating power level of the heater is lowered from the second level to the third level, And continue to heat the at least one power battery module, wherein the second preset threshold is greater than the first preset threshold, and there is a difference between the second level and the third level by one level; When the increase range does not reach the second preset threshold, keep heating the at least one power battery module at the second level; or, when the increase range reaches the third preset threshold, stop Heating the at least one power battery module, wherein the third preset threshold is greater than the second preset threshold; when the increase does not reach the third preset threshold, it remains at the third The level heats the at least one power battery module.

After the heating of the at least one power battery module is stopped, the method further includes: when the water temperature of the circulating water path of the at least one power battery module is lower than a fourth preset threshold or the increase range does not reach the third When the threshold is preset, the heater is restarted to heat the at least one power battery module using the third level.

When the power battery pack includes a plurality of power battery modules, determining the corresponding adjustment method for each power battery module according to the temperature difference includes: when the temperature difference is greater than a fifth preset threshold, according to each power battery module The temperature of the group groups the plurality of power battery modules to obtain multiple groups of power battery modules, wherein the temperature of the power battery modules in the same group is in the same temperature range, and different groups of power battery modules correspond to different Temperature range; using different heating power levels to heat the multiple groups of power battery modules, wherein the same group of power battery modules use the same heating power level, between different groups of power battery modules, the temperature The higher the threshold value of the interval, the lower the heating power level used by the power battery modules in the corresponding group.

Before detecting the temperature difference of each power battery module in real time, it further includes: acquiring the initial temperature of the at least one power battery module, wherein the initial temperature is in each power battery module in an unheated initial state The minimum temperature of the power battery cell; when the initial temperature is lower than the sixth preset threshold, determine the corresponding heating method according to the temperature interval where the initial temperature is located; according to the heating method for the at least one power The battery module is heated.

Before determining the corresponding heating method according to the temperature interval where the initial temperature is, it further includes: dividing a plurality of temperature intervals within a temperature range less than the sixth preset threshold according to a preset heating accuracy requirement, wherein each The temperature intervals correspond to different heating power levels, and the greater the difference between the critical value of each temperature interval and the sixth preset threshold, the lower the corresponding heating power level.

Determining the corresponding heating method according to the temperature interval where the initial temperature is located includes: determining the heating power level of the heater according to the temperature interval where the initial temperature is located; obtaining the corresponding heating power value through the heating power level; according to the heating Heating the at least one power battery module includes: controlling the heater to heat the at least one power battery module using the heating power value.

After heating the at least one power battery module according to the heating method, the method further includes: detecting in real time whether the initial temperature is greater than or equal to the sixth preset threshold in the heating state, and determining the initial When the temperature is greater than or equal to the sixth preset threshold, the heating of the at least one power battery module is stopped.

A heating control system for a power battery pack. The heating control system for a power battery pack is used to execute the heating control method for a power battery pack as described above.

An automobile includes: the heating control system of the power battery pack described above.

The above is only a preferred embodiment of the present disclosure. It should be pointed out that for those of ordinary skill in the art, without departing from the principles of the present disclosure, several improvements and retouches can also be made. These improvements and retouches also Should be regarded as the scope of protection of this disclosure.

Claims

A power battery pack heating control method, characterized in that the power battery pack includes: at least one power battery module; the method includes:

Real-time detection of the temperature difference of each power battery module, wherein the temperature difference is determined by the difference between the highest temperature and the lowest temperature of the power battery cell in each power battery module in the initial unheated state;

The adjustment mode corresponding to each power battery module is determined according to the increase range of the temperature difference or the temperature difference.
The heating control method according to claim 1, wherein determining the adjustment mode corresponding to each power battery module according to the increase range includes:

When the increase reaches the first preset threshold, the heating power level of the heater is reduced from the first level to the second level, and heating of the at least one power battery module is continued, wherein the There is a difference between a level and the second level; when the increase does not reach the first preset threshold, maintaining the first level to heat the at least one power battery module;

or,

When the increase reaches the second preset threshold, the heating power level of the heater is lowered from the second level to the third level, and the heating of the at least one power battery module is continued, wherein the first Two preset thresholds are greater than the first preset threshold, and the second level differs from the third level by one level; when the increase does not reach the second preset threshold, it remains at the The second level heats the at least one power battery module;

or,

When the increase reaches the third preset threshold, stop heating the at least one power battery module, wherein the third preset threshold is greater than the second preset threshold; when the increase is not When the third preset threshold is reached, the at least one power battery module is heated at the third level.
The heating control method according to claim 2, wherein after the heating of the at least one power battery module is stopped, the method further comprises:

When the water temperature of the circulating water channel of the at least one power battery module is lower than the fourth preset threshold or the increase range does not reach the third preset threshold, restart the heater and use the third level The at least one power battery module is heated.
The heating control method according to any one of claims 1 to 3, wherein when the power battery pack includes a plurality of power battery modules, the adjustment corresponding to each power battery module is determined according to the temperature difference The methods include:

When the temperature difference is greater than the fifth preset threshold, the plurality of power battery modules are grouped according to the temperature of each power battery module to obtain multiple sets of power battery modules, wherein the power batteries in the same group The temperature of the modules is in the same temperature range, and different groups of power battery modules correspond to different temperature ranges;

Different heating power levels are used to heat the multiple groups of power battery modules, wherein the power battery modules in the same group use the same heating power level, and the critical value of the temperature interval between different groups of power battery modules The higher, the lower the heating power level used by the power battery modules in the corresponding group.
The heating control method according to any one of claims 1 to 4, further comprising: before detecting the temperature difference of each power battery module in real time:

Acquiring the initial temperature of the at least one power battery module, wherein the initial temperature is the lowest temperature of the power battery cell in each power battery module in an unheated initial state;

When the initial temperature is lower than the sixth preset threshold, determine the corresponding heating mode according to the temperature interval where the initial temperature is located;

Heating the at least one power battery module according to the heating method.
The heating control method according to claim 5, characterized in that before determining the corresponding heating method according to the temperature interval in which the initial temperature is located, the method further comprises:

According to a preset heating accuracy requirement, a plurality of temperature intervals are divided within a temperature range less than the sixth preset threshold, wherein each temperature interval corresponds to a different heating power level, and the critical value of each temperature interval is The greater the difference between the sixth preset threshold, the lower the corresponding heating power level.
The heating control method according to claim 5 or 6, wherein determining the corresponding heating method according to the temperature interval in which the initial temperature is located comprises: determining the heating power level of the heater according to the temperature interval in which the initial temperature is located; Obtain the corresponding heating power value through the heating power level;

Heating the at least one power battery module according to the heating method includes: controlling the heater to heat the at least one power battery module using the heating power value.
The heating control method according to any one of claims 5-7, wherein after heating the at least one power battery module according to the heating method, the method further comprises:

Real-time detection of whether the initial temperature is greater than or equal to the sixth preset threshold in the heating state, and when it is determined that the initial temperature is greater than or equal to the sixth preset threshold, stopping the at least one power battery module The group is heated.
A power battery pack heating control system, characterized in that the power battery pack heating control system is used to execute the power battery pack heating control method according to any one of claims 1-8.
An automobile, characterized by comprising: the heating control system of the power battery pack of claim 9.