CN212373187U - Battery self-heating device and vehicle - Google Patents
Battery self-heating device and vehicle Download PDFInfo
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- CN212373187U CN212373187U CN202020977728.0U CN202020977728U CN212373187U CN 212373187 U CN212373187 U CN 212373187U CN 202020977728 U CN202020977728 U CN 202020977728U CN 212373187 U CN212373187 U CN 212373187U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The utility model discloses a battery self-heating device and vehicle that has this battery self-heating device. Wherein, this battery self-heating device includes: the power battery pack comprises a first sub battery pack and a second sub battery pack connected with the first sub battery pack in series; the input end of the bidirectional DC-DC converter is connected with the first sub battery pack, and the output end of the bidirectional DC-DC converter is connected with the second sub battery pack; the control module is respectively connected with the first sub-battery pack, the second sub-battery pack and the bidirectional DC-DC converter, the control module controls the bidirectional DC-DC converter to work so as to carry out cyclic reciprocating mutual charging and discharging on the first sub-battery pack and the second sub-battery pack, and the generated alternating current enables the internal resistance of the first sub-battery pack and the internal resistance of the second sub-battery pack to generate heat. The utility model discloses can shorten battery intensification time under the cold environment greatly, make the battery can resume the charging ability in short time.
Description
Technical Field
The utility model relates to an electric automobile technical field especially relates to a battery self-heating device and vehicle that has this battery self-heating device.
Background
The power battery is used as a power source and is widely used in energy systems of pure electric series and hybrid power train types. However, the external characteristics of the power battery are affected by the low-temperature environment temperature, the endurance mileage is reduced, lithium deposition occurs during the dc charging process, permanent damage is caused to the battery, and the service life and capacity of the battery are reduced. Therefore, in a low-temperature environment, before the battery is used, especially before low-temperature charging, the power battery needs to be heated to raise the temperature of the battery cell, so that the charging capability of the battery is recovered to be normal.
In the related art, a PTC (Positive Temperature Coefficient) heating scheme is generally adopted, that is, a PTC heating water path is used to circularly transfer heat to a power battery through the water path, so that the Temperature of the battery module increases from the outer shell to the inner core, and a schematic diagram of the PTC heating scheme is shown in fig. 1. However, the battery is indirectly heated by the PTC heating water path, and the temperature rise time is long, which results in low heat exchange efficiency.
Disclosure of Invention
The object of the present invention is to solve at least one of the above mentioned technical problems to a certain extent.
In a first aspect, an embodiment of the present invention provides a battery self-heating device, including:
the power battery pack comprises a first sub battery pack and a second sub battery pack connected with the first sub battery pack in series;
a bidirectional DC-DC converter, an input end of the bidirectional DC-DC converter is connected with the first sub battery pack, and an output end of the bidirectional DC-DC converter is connected with the second sub battery pack;
the control module is respectively connected with the first sub-battery pack, the second sub-battery pack and the bidirectional DC-DC converter, the control module controls the bidirectional DC-DC converter to work so as to perform cyclic reciprocating mutual charging and discharging on the first sub-battery pack and the second sub-battery pack, and the generated alternating current enables the internal resistance of the first sub-battery pack and the internal resistance of the second sub-battery pack to generate heat.
The utility model discloses battery self-heating device, through dividing power battery group split into two parts, first sub battery group and second sub battery group promptly, through external two-way DC-DC converter, realize that divided two parts group battery carries out the reciprocal charge-discharge each other of circulation, produce alternating current at this in-process, the electric current passes through the battery internal resistance, make power battery group make the battery heat up rapidly because the internal resistance of inside battery produces thermal reason, reach the effect of battery self-heating, can shorten battery warm-up time under the cold environment greatly, make the battery can resume the charge capacity in short time.
In addition, the battery self-heating device according to the above embodiment of the present invention may further have the following additional technical features:
in the present invention, the bidirectional DC-DC converter is an isolated bidirectional DC-DC converter.
In the present invention, the isolated bidirectional DC-DC converter includes: a first bridge arm formed by connecting a first switch tube T1 and a second switch tube T2 in series, a second bridge arm formed by connecting a third switch tube T3 and a fourth switch tube T4 in series, a third bridge arm formed by connecting a fifth switch tube T5 and a sixth switch tube T6 in series, a fourth bridge arm formed by connecting a seventh switch tube T7 and an eighth switch tube T8 in series, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2 and a transformer T, wherein,
two ends of the first bridge arm are respectively connected to the positive end and the negative end of the first sub-battery pack, and the half-bridge midpoint of the first bridge arm is connected to one end of the first inductor L1; the other end of the first inductor L1 is connected to one end of the primary side of the transformer T; two ends of the second bridge arm are respectively connected to the positive end and the negative end of the first sub-battery pack, and the half-bridge midpoint of the second bridge arm is connected to the other end of the primary side of the transformer T through the first capacitor C1; one end of the secondary side of the transformer T is connected to the middle point of the half bridge of the fourth bridge arm through the second capacitor C2; the other end of the secondary side of the transformer T is connected to the midpoint of the half bridge of the third bridge arm through the second inductor L2; and two ends of the third bridge arm are respectively connected to the positive end and the negative end of the second sub-battery pack, and two ends of the fourth bridge arm are respectively connected to the positive end and the negative end of the second sub-battery pack.
The utility model discloses in, battery self-heating device still includes:
the temperature sensor is respectively connected with the power battery pack and the control module, and is used for measuring the temperature of the power battery pack and sending the measured temperature of the power battery pack to the control module;
the control module controls the bidirectional DC-DC converter to work according to the temperature of the power battery pack measured by the temperature sensor.
In the present invention, the control module controls the on/off operation of the switching tube in the bidirectional DC-DC converter based on a target pulse width modulation control signal when the temperature of the power battery pack measured by the temperature sensor is less than a first threshold value, so as to switch the bidirectional DC-DC converter between a forward operating state and a reverse operating state, and controls the bidirectional DC-DC converter to stop operating when the temperature of the power battery pack measured by the temperature sensor is greater than a second threshold value; wherein the second threshold is greater than the first threshold.
The present invention is directed to a bidirectional DC-DC converter, wherein the bidirectional DC-DC converter is in at least one of a first time period of a forward operation state and a second time period of a reverse operation state, and the first time period and the second time period are determined by an alternating current frequency that can be borne by a power battery pack at the maximum.
The present invention is directed to a power battery pack, wherein the sum of voltages of the first sub-battery pack and the second sub-battery pack is kept consistent with the total voltage of the power battery pack.
In the present invention, the total voltage of the first sub-battery group and the total voltage of the second sub-battery group are kept consistent.
In the present invention, a difference between a total voltage of the first sub-battery pack and a total voltage of the second sub-battery pack is smaller than a target value; wherein the target value is determined by a gain range of the bidirectional DC-DC converter.
In a second aspect, an embodiment of the present invention further provides a vehicle, which includes the battery self-heating apparatus in the above-mentioned embodiment of the first aspect.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a diagram illustrating an example of heating a battery pack by a PTC and a water circuit in the related art.
Fig. 2 is a first schematic structural diagram of a battery self-heating device according to an embodiment of the present invention.
Fig. 3 is a schematic circuit diagram of a battery self-heating device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram ii of a battery self-heating device according to an embodiment of the present invention.
Fig. 5 is an exemplary diagram of current flow when the isolated bidirectional DC-DC converter according to an embodiment of the present invention is in a forward operating state.
Fig. 6 is a first exemplary diagram of control waveforms of the switching tubes T1 to T8 according to the embodiment of the present invention.
Fig. 7 is an exemplary diagram of current flow when the isolated bidirectional DC-DC converter is in a reverse operating state according to an embodiment of the present invention.
Fig. 8 is a second exemplary diagram of control waveforms of the switching tubes T1 to T8 according to the embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a vehicle according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
The following describes a battery self-heating apparatus and a vehicle having the same according to embodiments of the present invention with reference to the drawings.
Fig. 2 is a schematic structural diagram of a battery self-heating device according to an embodiment of the present invention. As shown in fig. 2, the battery self-heating apparatus 100 may include: a power battery pack 10, a bidirectional DC-DC converter 20, and a control module 30. Wherein, the power battery pack 10 comprises a first sub-battery pack 11 and a second sub-battery pack 12, and the first sub-battery pack 11 is connected in series with the second sub-battery pack 12. The input terminal of the bidirectional DC-DC converter 20 is connected to the first sub-battery pack 11, and the output terminal of the bidirectional DC-DC converter 20 is connected to the second sub-battery pack 12. The control module 30 is connected to the first sub-battery pack 11, the second sub-battery pack 12, and the bidirectional DC-DC converter 20, respectively.
In the present invention, the control module 30 may be configured to control the bidirectional DC-DC converter 20 to operate to perform the reciprocal charging and discharging of the first sub-battery pack 11 and the second sub-battery pack 12, and the generated alternating current may generate heat in the internal resistance of the first sub-battery pack 11 and the second sub-battery pack 12. For example, the input end of the bidirectional DC-DC converter 20 may be connected in parallel to the positive and negative ends of the first sub-battery pack 11, and the output end of the bidirectional DC-DC converter 20 may be connected in parallel to the positive and negative ends of the second sub-battery pack 12, the bidirectional DC-DC converter 20 is controlled by the control module 30 to operate so as to perform cyclic reciprocal charging and discharging on the first sub-battery pack 11 and the second sub-battery pack 12, during which an alternating current may be generated, and when the generated alternating current flows through the internal resistances of the batteries in the first sub-battery pack 11 and the second sub-battery pack 12, the internal resistances of the batteries in the first sub-battery pack 11 and the second sub-battery pack 12 may generate heat, so that the temperature of the single batteries in the first sub-battery pack 11 and the second sub-battery pack 12 may be rapidly increased.
It should be noted that, in the present invention, the first sub-battery pack 11 and the second sub-battery pack 12 may be respectively composed of a plurality of single batteries. For example, the first sub-battery pack 11 may be composed of a plurality of single batteries connected in series; the second sub-battery 12 may also be composed of a plurality of single batteries connected in series. That is to say, the utility model discloses a split into two sub-batteries group with the power battery group, first sub-battery group 11 and second sub-battery group 12 establish ties and constitute power battery group 10. Wherein, the sum of the voltages of the first sub-battery pack 11 and the second sub-battery pack 12 is consistent with the total voltage of the power battery pack 10, that is, the total voltage V0 of the power battery pack 10, the voltage V1 of the first sub-battery pack 11, and the voltage V2 of the second sub-battery pack 12 satisfy the following relations: v0 ═ V1+ V2.
That is, the power battery pack 10 of the present invention can be formed by connecting a plurality of battery cells in series, and the present invention divides the power battery pack 10 formed by a plurality of battery cells into two parts, which are divided into a first sub-battery pack 11 and a second sub-battery pack 12, and connects the bidirectional DC-DC converter 20 between the first sub-battery pack 11 and the second sub-battery pack 12 in parallel, so that, in a low temperature environment, the control module 30 may start the bidirectional DC-DC converter 20 to operate, so that the first sub-battery pack 11 and the second sub-battery pack 12 are charged and discharged reciprocally, the current of the discharging sub-battery pack is direct current (low-temperature discharge has no influence on the performance of the battery pack), the current of the charging sub-battery pack is triangular wave or sine wave, thus, the power battery pack 10 has a cyclic and controllable alternating current flowing through it, so that its internal resistance is rapidly triggered.Heat and power P ═ I2And R, wherein I is an alternating current effective value, and R is the internal resistance of the battery of the power battery pack.
In order to ensure that the current obtained when the energy flows is consistent, optionally, in the present invention, the total voltage of the first sub-battery group 11 is consistent with the total voltage of the second sub-battery group 12. That is, the capacity of the first sub-battery pack 11 and the capacity of the second sub-battery pack 12 are substantially consistent, the total voltage of the first sub-battery pack 11 and the voltage level of the second sub-battery pack 12 are the same, and the total voltage of the first sub-battery pack 11 and the internal battery resistance of the second sub-battery pack 12 are substantially consistent, so that when the first sub-battery pack and the second sub-battery pack are cyclically charged and discharged with each other by using the bidirectional DC-DC converter, the current obtained when energy flows can be guaranteed to be consistent, and the performance of the power battery pack can be guaranteed.
Since there is a mapping relationship between the input and output voltages of the bidirectional DC-DC converter and the gain characteristic of the converter, in order to ensure that the current obtained when the energy flows is consistent, optionally, in the present invention, the difference between the total voltage of the first sub-battery pack 11 and the total voltage of the second sub-battery pack 12 may be smaller than a target value, wherein the magnitude of the target value is determined by the gain range of the bidirectional DC-DC converter. That is, due to the gain characteristic of the bidirectional DC-DC converter, there is a certain difference between the input voltage and the output voltage of the bidirectional DC-DC converter, and in order to ensure that the currents obtained when the energy flows are the same, there is a certain difference between the voltage of the first sub-battery pack 11 and the voltage of the second sub-battery pack 12, and the difference between the voltages of the two sub-battery packs is determined by the gain range of the bidirectional DC-DC converter.
In order to save costs and achieve the charging and discharging of the two battery packs separated by the power battery pack, the bidirectional DC-DC converter 20 may be an isolated bidirectional DC-DC converter. That is to say, the power battery pack can be divided into a first sub battery pack and a second sub battery pack, the two separated battery packs are charged and discharged mutually through an external isolation type bidirectional DC-DC converter, and the self-heating technology of heating through the internal resistance of the battery is adopted.
Fig. 3 is a schematic circuit diagram of a battery self-heating device according to an embodiment of the present invention. Among them, the isolated bidirectional DC-DC converter 21 may include: the first bridge arm is formed by connecting a first switching tube T1 and a second switching tube T2 in series, the second bridge arm is formed by connecting a third switching tube T3 and a fourth switching tube T4 in series, the third bridge arm is formed by connecting a fifth switching tube T5 and a sixth switching tube T6 in series, the fourth bridge arm is formed by connecting a seventh switching tube T7 and an eighth switching tube T8 in series, and the first inductor L1, the second inductor L2, the first capacitor C1, the second capacitor C2 and the transformer T are connected in series. Two ends of the first bridge arm are respectively connected to the positive end and the negative end of the first sub-battery pack 11, and the half-bridge midpoint of the first bridge arm is connected to one end of a first inductor L1; the other end of the first inductor L1 is connected to one end of the primary side of the transformer T; two ends of the second bridge arm are respectively connected to the positive end and the negative end of the first sub battery pack 11, and the half bridge midpoint of the second bridge arm is connected to the other end of the primary side of the transformer T through a first capacitor C1; one end of the secondary side of the transformer T is connected to the middle point of the half bridge of the fourth bridge arm through a second capacitor C2; the other end of the secondary side of the transformer T is connected to the midpoint of the half bridge of the third bridge arm through a second inductor L2; two ends of the third bridge arm are respectively connected to the positive end and the negative end of the second sub-battery pack 12, and two ends of the fourth bridge arm are respectively connected to the positive end and the negative end of the second sub-battery pack 12.
In the present invention, as shown in fig. 4, the battery self-heating apparatus 100 may further include: a temperature sensor 40. Wherein, the temperature sensor 40 can be respectively connected with the power battery pack 10 and the control module 30, and the temperature sensor 40 can be used for measuring the temperature of the power battery pack 10 and sending the measured temperature of the power battery pack 10 to the control module 30. The control module 30, upon receiving the temperature of the power battery pack 10 from the temperature sensor 40, may control the operation of the bidirectional DC-DC converter 20 according to the temperature of the power battery pack 10 measured by the temperature sensor 40. The temperature of the power battery pack 10 measured by the temperature sensor 40 may be an average temperature of the power battery pack 10, which may be obtained by averaging the temperatures of all the battery cells in the power battery pack 10.
For example, when receiving the temperature of the power battery pack 10 sent by the temperature sensor 40, the control module 30 may determine whether the power battery pack 10 needs to be heated by itself at present according to the current temperature of the power battery pack 10, for example, when determining that the current temperature of the power battery pack 10 is less than the first threshold, the power battery pack may be considered to be in a low-temperature environment at present, and at this time, the control module may control the on-off operation of the switching tube in the bidirectional DC-DC converter 20 based on the target pulse width modulation control signal, so as to switch the bidirectional DC-DC converter 20 between the forward operating state and the reverse operating state.
In the process of controlling the bidirectional DC-DC converter 20 to switch between the forward working state and the reverse working state through the control module 30, the temperature sensor 40 may measure the temperature of the power battery pack 10 in real time, and send the measured temperature to the control module 30, and when the control module 30 determines that the current temperature of the power battery pack 10 is greater than the second threshold (where the second threshold is greater than the first threshold), the bidirectional DC-DC converter 20 may be controlled to stop working, that is, the power battery pack 10 is heated up at this time, and the temperature of the core of the power battery pack may meet the use requirement, so that the charging capability of the power battery pack is recovered to be normal along with the temperature rise. That is, when the temperature T of the power battery pack reaches the second threshold, i.e., the preset temperature T1, the control module 30 may control the bidirectional DC-DC converter 20 to stop operating, and the charging and discharging processes of the first sub-battery pack and the second sub-battery pack are terminated. When no heating is required, the battery system is not affected because the bi-directional DC-DC converter is in an off state.
In the present invention, taking the bidirectional DC-DC converter as an isolated bidirectional DC-DC converter as an example, the current flow when the isolated bidirectional DC-DC converter is in the forward working state can be as shown in fig. 5. The control module can control a first switch tube T1, a second switch tube T2, a third switch tube T3 and a fourth switch tube T4 in the isolated bidirectional DC-DC converter to be switched on, a fifth switch tube T5, a sixth switch tube T6, a seventh switch tube T7 and an eighth switch tube T8 are switched off, and control waveforms of the switch tubes T1-T8 can be shown in FIG. 6, wherein the switch tubes T1 and T4 are in phase, and the switch tubes T2 and T3 are in phase. The control module can control the on-off operation of a switch tube in the isolated bidirectional DC-DC converter based on a pulse width modulation control signal as shown in FIG. 6, so as to adjust the gain of the converter and control the current by controlling the voltage in the circuit. During the forward operation of the isolated bidirectional DC-DC converter, the system energy flows from the primary to the secondary through the transformer T, and the first sub-battery pack 11 charges the second sub-battery pack 12 through the isolated bidirectional DC-DC converter 21. And setting the charging time period delta t1 for the second sub-battery pack 12 each time, and when the charging time period t is delta t1, controlling the isolated bidirectional DC-DC converter to stop the forward operation and switch to the reverse operation by the control module.
The current flow when the isolated bidirectional DC-DC converter is in the reverse operating state can be as shown in fig. 7. The control module can control a first switch tube T1, a second switch tube T2, a third switch tube T3 and a fourth switch tube T4 in the isolated bidirectional DC-DC converter to be switched off, a fifth switch tube T5, a sixth switch tube T6, a seventh switch tube T7 and an eighth switch tube T8 are switched on, and control waveforms of the switch tubes T1-T8 can be shown in FIG. 8, wherein the switch tubes T5 and T8 are in phase, and the switch tubes T6 and T7 are in phase. The control module can control the on-off operation of a switch tube in the isolated bidirectional DC-DC converter based on a pulse width modulation control signal as shown in FIG. 8, so as to adjust the gain of the converter and control the current by controlling the voltage in the circuit. During the reverse operation of the isolated bidirectional DC-DC converter, the system energy flows from the secondary to the primary through the transformer T, and the second sub-battery 12 charges the first sub-battery 11 through the isolated bidirectional DC-DC converter 21. Setting the charging time period delta t2 for the first sub battery pack 11 each time, and when the charging time period t is delta t2, the control module controls the isolated bidirectional DC-DC converter to stop reverse operation. And then, the isolated bidirectional DC-DC converter is controlled to switch between a forward working state and a reverse working state in a circulating and reciprocating mode, at the moment, forward and reverse flowing alternating currents are generated on the first sub battery pack and the second sub battery pack, and the alternating currents flow through the internal resistance of the power battery pack, so that the power consumption of the internal resistance can enable the temperature of the power battery pack to rise.
It is worth noting that in the utility model discloses in, two-way DC-DC converter is the same during the first time that is in forward operating condition at every turn and during the second time that is in reverse operating condition at every turn, and the first time is long and the second is long to be decided by the alternating current frequency that the power battery group can bear the biggest. That is, assuming that the charging period (i.e., the above-mentioned first period of time) is Δ t1 each time the first sub-battery pack is used to charge the second sub-battery pack (i.e., each time the bidirectional DC-DC converter is in the forward operation state), the charging period (i.e., the above-mentioned second period of time) is Δ t2 each time the second sub-battery pack is used to charge the first sub-battery pack (i.e., each time the bidirectional DC-DC converter is in the reverse operation state), Δ t1 and Δ t2 should satisfy: Δ t2 is Δ t 1. The first time period Δ t1 and the second time period Δ t2 may be determined by the maximum sustainable ac frequency of the power battery pack, which may be 100 hz, for example. It is understood that charging in a low temperature environment causes a great loss of the battery, and lithium precipitation occurs to reduce the life of the battery. For charging and discharging of the lithium ion battery for the vehicle, when the frequency is higher, the current is increased without causing any damage to the battery, and the lithium separation phenomenon is more difficult to generate when the frequency is higher. Therefore, based on this characteristic, in order to make the alternating current that produces the forward and reverse flow on first sub-group battery and second sub-group battery, make the internal resistance of group battery produce heat through the alternating current who produces to it is battery temperature rise, the utility model discloses in, this alternating current frequency can be 100 hertz.
According to the utility model discloses battery self-heating device, through dividing power battery group split into two parts, first sub battery group and second sub battery group promptly, through external two-way DC-DC converter, realize that divided two parts group battery carries out the reciprocal charge-discharge each other of circulation, produce alternating current at this in-process, the electric current passes through the battery internal resistance, make power battery group make the battery heat up rapidly because the internal resistance of inside battery produces thermal reason, reach the effect of battery self-heating, can shorten battery warm-up time under the cold environment greatly, make the battery can resume the charge capacity in short time.
It should be noted that, in an embodiment of the present invention, the power battery pack can be split into a plurality of parts, that is, into two or more sub-battery packs, and the two or more sub-battery packs are externally connected to a plurality of bidirectional DC-DC converters to realize the cyclic reciprocal charging and discharging of the two or more sub-battery packs. For example, the power battery pack can be split into 2N sub-battery packs, N is a positive integer, and a bidirectional DC-DC converter is connected in parallel between every two sub-battery packs, so that the two sub-battery packs connected in parallel with the bidirectional DC-DC converter can be charged and discharged in a reciprocating manner, alternating current is generated in the process, and the current passes through internal resistance of the battery, so that the internal resistance of every two sub-battery packs generates heat, and the effect of self-heating of the battery is achieved.
In order to realize the embodiment, the utility model also provides a vehicle.
Fig. 9 is a schematic structural diagram of a vehicle according to an embodiment of the present invention. As shown in fig. 9, the vehicle 90 may include: the battery self-heating device 100. The structural and functional descriptions of the battery self-heating device 100 can be referred to the structural and functional descriptions of the battery self-heating device according to any embodiment of the present invention, which are not repeated herein. It should be noted that the vehicle may be a pure electric vehicle, and may also be a hybrid electric vehicle.
According to the utility model discloses a vehicle, through with power battery group split into two parts, first sub battery group and second sub battery group promptly, through external two-way DC-DC converter, realize that divided two parts group battery carries out the reciprocal charge-discharge each other of circulation, produce alternating current at this in-process, the electric current passes through the battery internal resistance, make power battery group make the battery heat up rapidly because the internal resistance of inside battery produces thermal reason, reach the effect of battery self-heating, can shorten battery warm-up time under the cold environment greatly, make the battery can resume the charge capacity in short time.
In the description of the present invention, it is to be understood that the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any indication of the number of technical features indicated. Thus, features defined as "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art without departing from the scope of the present invention.
Claims (10)
1. A battery self-heating device, comprising:
the power battery pack comprises a first sub battery pack and a second sub battery pack connected with the first sub battery pack in series;
a bidirectional DC-DC converter, an input end of the bidirectional DC-DC converter is connected with the first sub battery pack, and an output end of the bidirectional DC-DC converter is connected with the second sub battery pack;
the control module is respectively connected with the first sub-battery pack, the second sub-battery pack and the bidirectional DC-DC converter, the control module controls the bidirectional DC-DC converter to work so as to perform cyclic reciprocating mutual charging and discharging on the first sub-battery pack and the second sub-battery pack, and the generated alternating current enables the internal resistance of the first sub-battery pack and the internal resistance of the second sub-battery pack to generate heat.
2. The battery self-heating apparatus according to claim 1, wherein the bidirectional DC-DC converter is an isolated bidirectional DC-DC converter.
3. The battery self-heating apparatus of claim 2, wherein the isolated bidirectional DC-DC converter comprises: a first bridge arm formed by connecting a first switch tube T1 and a second switch tube T2 in series, a second bridge arm formed by connecting a third switch tube T3 and a fourth switch tube T4 in series, a third bridge arm formed by connecting a fifth switch tube T5 and a sixth switch tube T6 in series, a fourth bridge arm formed by connecting a seventh switch tube T7 and an eighth switch tube T8 in series, a first inductor L1, a second inductor L2, a first capacitor C1, a second capacitor C2 and a transformer T, wherein,
two ends of the first bridge arm are respectively connected to the positive end and the negative end of the first sub-battery pack, and the half-bridge midpoint of the first bridge arm is connected to one end of the first inductor L1; the other end of the first inductor L1 is connected to one end of the primary side of the transformer T; two ends of the second bridge arm are respectively connected to the positive end and the negative end of the first sub-battery pack, and the half-bridge midpoint of the second bridge arm is connected to the other end of the primary side of the transformer T through the first capacitor C1; one end of the secondary side of the transformer T is connected to the middle point of the half bridge of the fourth bridge arm through the second capacitor C2; the other end of the secondary side of the transformer T is connected to the midpoint of the half bridge of the third bridge arm through the second inductor L2; and two ends of the third bridge arm are respectively connected to the positive end and the negative end of the second sub-battery pack, and two ends of the fourth bridge arm are respectively connected to the positive end and the negative end of the second sub-battery pack.
4. The battery self-heating apparatus according to claim 3, further comprising:
the temperature sensor is respectively connected with the power battery pack and the control module, and is used for measuring the temperature of the power battery pack and sending the measured temperature of the power battery pack to the control module;
the control module controls the bidirectional DC-DC converter to work according to the temperature of the power battery pack measured by the temperature sensor.
5. The battery self-heating device according to claim 4, wherein the control module controls a switching tube in the bidirectional DC-DC converter to be switched on and off based on a target PWM control signal when the temperature of the power battery pack measured by the temperature sensor is less than a first threshold value, so that the bidirectional DC-DC converter is switched between a forward operating state and a reverse operating state, and controls the bidirectional DC-DC converter to stop operating when the temperature of the power battery pack measured by the temperature sensor is greater than a second threshold value; wherein the second threshold is greater than the first threshold.
6. The battery self-heating apparatus according to claim 5, wherein a first time period of each time the bidirectional DC-DC converter is in the forward operation state and a second time period of each time the bidirectional DC-DC converter is in the reverse operation state are the same, and the first time period and the second time period are determined by the maximum sustainable alternating current frequency of the power battery pack.
7. The battery self-heating device according to any one of claims 1 to 6, wherein the sum of the voltages of the first sub-battery pack and the second sub-battery pack is in agreement with the total voltage of the power battery pack.
8. The battery self-heating apparatus according to claim 7, wherein the total voltage of the first sub-battery pack is kept identical to the total voltage of the second sub-battery pack.
9. The battery self-heating apparatus according to claim 7, wherein a difference between a total voltage of the first sub-battery pack and a total voltage of the second sub-battery pack is smaller than a target value; wherein the target value is determined by a gain range of the bidirectional DC-DC converter.
10. A vehicle, characterized by comprising: a battery self-heating apparatus as claimed in any one of claims 1 to 9.
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