CN110031679B - Internal resistance testing method based on chemical composition capacitance-grading power supply - Google Patents
Internal resistance testing method based on chemical composition capacitance-grading power supply Download PDFInfo
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- CN110031679B CN110031679B CN201910243065.1A CN201910243065A CN110031679B CN 110031679 B CN110031679 B CN 110031679B CN 201910243065 A CN201910243065 A CN 201910243065A CN 110031679 B CN110031679 B CN 110031679B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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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
Abstract
The invention relates to the technical field of digital power supplies, in particular to an internal resistance testing technology based on a component-capacitance-grading power supply, wherein a system of the invention is composed of a hardware power supply, a sampling system and a software control system, wherein the hardware power supply provides current, direct current is obtained through the software control system, and the sampling system is used for high-precision sampling of a battery side; the invention has high test precision, adopts high sampling grade combined with high current dynamic performance control, improves the detection precision from the scheme, reduces the measurement error caused by the polarization internal resistance of the battery, adopts a high-performance DSP chip as a control chip in a software scheme, adopts a hardware with an HPWM high-precision output module and 16-level SPI FIFO to support higher sampling communication, and has faster floating point operation performance. The consumption of a power battery internal resistance testing instrument is saved, the battery formation grading equipment belongs to common equipment, and the equipment cost is far lower than that of the testing instrument. And the large-scale detection of the battery can be realized. The production efficiency is accelerated on the premise of saving the cost.
Description
Technical Field
The invention relates to the technical field of digital power supplies, in particular to an internal resistance testing method based on a component-capacitance power supply.
Background
With the great popularization of new energy automobiles, the demand of power batteries used by the new energy automobiles is continuously increased. Because of the high safety standard of the dangerousness of the power battery, each battery must be subjected to a component-volume test, and a component-volume power supply of one of devices serving as the battery component-volume charge-discharge test task has a great proportion in the production and detection link of the power battery. With the continuous development of the battery management demand, the battery formation capacity-sharing power supply scheme is continuously and gradually improved, the application of the digital power supply technology to the formation capacity-sharing power supply is wider, and the digital power supply adopting a Digital Signal Processor (DSP) as a control unit is also widely applied due to the specific functions and performances of the digital power supply. The detection of the internal resistance of the battery is an important index in the battery test and always is a key difficulty of the battery test, the common battery internal resistance test is measured by adopting a special battery internal resistance analyzer, and the method for testing the internal resistance of the battery by adopting a circuit is widely used.
1. DSP (digital signal processor) digital power supply
Based on DSP microprocessor controller platform. The voltage and current sampling data of the circuit are directly sent to the controller to be used as control input, and the microprocessor is provided with a PWM driving control module and outputs PWM signals to control the circuit switch. Compared with the traditional MUC (microcontroller), all feedback and control functions in the power supply are completed in the DSP, and the unique multiplication unit can complete more tasks of multiplication in a single-cycle time, so that a stronger control algorithm is realized. For power supply control, the reaction speed and the output precision of control are improved, and the method is widely applied to the application of power batteries.
2. Battery internal resistance detection method and background technology
In the process of detecting the chemical composition and the content of the power battery, a large number of power supplies are needed to carry out charge-discharge cycle test on the power battery, and battery parameters such as the steady-state voltage of the battery, the capacity of the battery, the internal resistance of the battery, the direct-current impedance and the like are measured. The measurement of the internal resistance of the battery is complex and is easily influenced by various interference factors. The current common battery internal resistance detection mainly comprises a direct current internal resistance measurement method and an alternating current internal resistance measurement method.
1) Direct current internal resistance measuring method
The testing equipment enables the battery to pass through stable direct current in a short time, simultaneously measures the voltage before and after the current of the battery changes, and calculates the current internal resistance of the battery according to the ratio of the voltage change differential pressure to the passing current. The IEC test method requires that after a battery is fully charged, it is discharged at 0.2C for 10S and then at 1C for 1S. This test method has many limitations:
can only measure large-capacity batteries, and the small batteries can not meet the test conditions due to small load current
When the battery passes through large current, the electrode in the battery generates polarization phenomenon due to chemical property, so as to generate polarization internal resistance, and the test of the internal resistance of the battery is greatly influenced.
A large amount of overcurrent has an influence on battery performance.
2) Alternating current internal resistance measuring method
The testing equipment gives a constant-frequency small current (1 kHZ and 50mA small current are commonly used at present) to the battery, and the alternating current component is filtered and rectified by sampling the voltage of the battery.
The AC internal resistance sampling method has the advantages and disadvantages:
the method has the advantages of wide application range, convenient realization of low current test and low requirement on the battery.
The test requirement is high, and the current is easily interfered due to the high requirement on the sampling precision of the small current.
And a special testing instrument is required to realize the alternating current internal resistance test.
In the field of large-capacity battery testing, only a current measuring method can be adopted, but cannot be adopted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention discloses an internal resistance testing method based on a chemical composition capacity-grading power supply, which improves the traditional chemical composition capacity-grading power supply and realizes the testing of the large-scale battery chemical composition capacity-grading power supply on the internal resistance of the battery. The problem of measuring the internal resistance of the power battery is solved from the aspects of cost and application.
The invention is realized by the following technical scheme:
the internal resistance testing method based on the chemical composition capacity power supply is characterized in that a system of the internal resistance testing method is composed of a hardware power supply, a sampling system and a software control system, wherein the hardware power supply provides current, direct current is obtained through the software control system, and the sampling system is used for high-precision sampling of a battery side.
Preferably, the hardware power supply adopts a bidirectional DC-DCBuckboost circuit to complete level conversion from the input direct-current bus to the battery, so as to realize output control of the battery.
Preferably, the output end of the hardware power supply adopts LC filtering, so that output ripples are reduced, sampling noise is reduced, the power element adopts IGBT, and the drive adopts a PWM control mode.
Preferably, the sampling system is composed of a sampling chip, a communication circuit, an operational amplifier circuit filter circuit and a protection circuit.
Preferably, the sampling system samples the operating parameters of the main power circuit and the state of the power battery, receives the working mode and the initialization configuration information from the system software, transmits the sampling data to the main control system through SPI communication, and uploads the sampling data in real time after the power main circuit is successfully operated.
Preferably, the software control system uses a CLA processor, based on the dual processor operating mode, using feedforward control, feedforward filtering and pattern recognition.
Preferably, the software control system of the internal resistance testing method includes the following processing steps:
s1 test the pretreatment operation small quantity control, test the channel parameter of the base, and wait for the feedback data of the external sampling system.
S2 waits for the circuit to be in a stable initial state, and then performs output control to acquire sample data from the outside according to the input feed-forward mode parameter. 20
And S3, completing data acquisition and entering data processing.
S4, the feedforward control quantity is adjusted through a feedforward filtering algorithm, and fraction data from the influence of the bus load fluctuation are processed.
And S5, the new feedforward control data is used, the feedforward control test is started again, the test is completed according to the set test times, and the data are output through communication.
Preferably, in S1, if the operation is successful, the data is integrated and input into the feed-forward modeling module as the initialization data; the feedforward control feeds data to the CLA kernel, entering CLA control.
Preferably, in S3, the processing result is used for subsequent PI control and parameter optimization, and the subsequent PI control controls the circuit in a stable state and outputs the optimized parameter.
The invention has the beneficial effects that:
1) the testing precision is high, the high sampling level is combined with the high current dynamic performance control, the detection precision is improved from the scheme, and the measurement error caused by the polarization internal resistance of the battery is reduced.
As the core technical content of the invention, the sampling precision is increased by using an external special sampling module, and the control performance is greatly improved by a core control algorithm. And finally obtaining high-quality measurement precision of the internal resistance of the battery.
2) The software scheme adopts a high-performance DSP chip as a control chip, and hardware has an HPWM high-precision output module, a 16-level SPI FIFO supporting higher sampling communication and faster floating point operation performance.
3) The consumption of a power battery internal resistance testing instrument is saved, the battery formation grading equipment belongs to common equipment, and the equipment cost is far lower than that of the testing instrument.
4) The battery internal resistance test instrument is usually provided by instrument equipment manufacturers, and the use occasion is mainly a special battery internal resistance test. Not applicable to large-scale battery production test. The invention integrates the internal resistance testing function into the component capacity power supply, and can realize the large-scale detection of the battery. The production efficiency is accelerated on the premise of saving the cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic step diagram of the software control system of the present invention;
FIG. 2 is a schematic diagram of a hardware power supply circuit of the present invention;
FIG. 3 is a schematic diagram of a sampling comparison circuit of the sampling system of the present invention;
fig. 4 is a schematic diagram of a sampling chip communication circuit of the sampling system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment discloses an internal resistance testing method based on a chemical component capacity power supply, which is characterized in that a system of the internal resistance testing method is composed of a hardware power supply, a sampling system and a software control system, wherein the hardware power supply provides current, direct current is obtained through the software control system, and the sampling system is used for high-precision sampling of a battery side.
The hardware power supply adopts a bidirectional DC-DCBuckboost circuit to complete the level conversion from the input direct current bus to the battery and realize the output control of the battery.
The output end of the hardware power supply adopts LC filtering, output ripples are reduced, sampling noise is reduced, the power element adopts IGBT, and the drive adopts a PWM control mode.
The sampling system consists of a sampling chip, a communication circuit, an operational amplifier circuit filter circuit and a protection circuit.
The sampling system samples the operating parameters of the main circuit of the power supply and the state of the power battery, receives the working mode and the initialization configuration information from system software, transmits the sampling data to the master control system through SPI communication, and uploads the sampling data in real time after the power supply main circuit is successfully operated.
The software control system uses a CLA processor based on a dual processor operating mode using feedforward control, feedforward filtering and pattern recognition.
Example 2
The embodiment discloses a direct current internal resistance testing method based on a DSP digital power supply. By adding an external sampling detection scheme, the precision sampling of the battery is realized. And developing a system control unit to realize the precision control of the battery. And the internal resistance detection function of the power battery is realized through a software function. The system consists of a hardware power supply, a sampling system and a software control system.
1) Power supply hardware scheme
As shown in fig. 2, the hardware power supply uses a bidirectional DC-DC (direct current-direct current conversion) buck boost (up/down converter) circuit to complete level conversion from the input direct current bus to the battery, thereby realizing output control of the battery. And LC (passive filter) filtering is adopted at the output end for reducing output ripples and reducing sampling noise increase. The main power element adopts IGBT (insulated gate bipolar transistor), and the drive adopts PWM (pulse width modulation) control mode.
2) Sampling system
The sampling system consists of a sampling chip, a communication circuit, an operational amplifier circuit filter circuit and a protection circuit. The power supply main circuit operation parameter sampling and the power battery state sampling are achieved, the working mode and the initialization configuration information from system software are received, the sampling data are transmitted to the main control system through SPI communication, and the sampling data are uploaded in real time after successful operation.
The schematic diagram of the sampling comparison circuit is shown in fig. 3, and the schematic diagram of the sampling chip communication circuit is shown in fig. 4.
3) Software control system
The software control system is the core content of the invention. And basic control on a power supply, communication and management of a sampling system and implementation of a power battery internal resistance test software scheme are undertaken.
CLA (control law accelerator) is used as an independently operated processor, has an independent RAM space, can finish floating point operation in a single period, can synchronize the operation of a main core and independently undertake operation tasks.
Based on the dual processor operating mode, a core algorithm is used: feedforward control, feedforward filtering and mode identification.
The flow is shown in figure 1:
1) and (4) test preprocessing, namely firstly running small-quantity control, testing basic channel parameters, and waiting for feedback data of an external sampling system in the period. And if the operation is successful, integrating the data, and inputting the data into the feedforward modeling module as initialization data. The feedforward control feeds data to the CLA kernel, entering CLA control.
2) And the CLA kernel processing is to wait for the circuit to be in a stable initial state, then carry out output control according to the input feedforward mode parameters, and obtain sampling data from the outside after a period of time (1-2ms) of program operation. And finishing data acquisition and entering data processing. And the processing result is used for subsequent PI control and parameter optimization. And controlling the circuit in a stable state by subsequent PI control, and outputting the optimized parameters.
In the CLA kernel control phase, the influence from bus load fluctuation needs to be processed, and the part of data is adjusted by a feedforward filtering algorithm to the feedforward control quantity.
3) And repeating the iterative test, and using the new feedforward control data to enter the feedforward control test again. And finishing the test according to the set test times, and outputting the data through communication.
The embodiment integrates the internal resistance testing function on the battery formation capacity-grading power supply, and innovations are realized in function. The software control method is innovative. And a feedforward preprocessing link is added to realize the estimation of the battery parameters. And the battery current is controlled to obtain high dynamic performance by adopting an algorithm of pattern recognition feedforward parameters. And a parameter recursion mode is adopted to obtain battery internal resistance data with higher precision along with the new model parameters. And an independent sampling system is adopted, and high sampling precision is obtained by combining high dynamic performance control of battery current. One measurement is completed in a short time, so that the testing difficulty caused by the polarization internal resistance of the battery is avoided.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. The internal resistance testing method based on the chemical-composition capacity-sharing power supply is characterized in that a system of the internal resistance testing method is composed of a hardware power supply, a sampling system and a software control system, wherein the hardware power supply provides current, direct current is obtained through the software control system, and the sampling system is used for high-precision sampling of a battery side;
the hardware power supply adopts a bidirectional DC-DCBuckboost circuit to complete the level conversion from the input direct-current bus to the battery and realize the output control of the battery;
the output end of the hardware power supply adopts LC filtering, so that output ripples are reduced, sampling noise is reduced, the power element adopts IGBT, and the driving adopts a PWM control mode;
the software control system uses a CLA processor, and based on the working mode of a dual processor, uses feedforward control, feedforward filtering and mode identification;
the software control system of the internal resistance testing method comprises the following processing steps:
s1 testing preprocessing operation small quantity control, testing basic channel parameters, and waiting for feedback data of an external sampling system;
s2, waiting for the circuit to be in a stable initial state, then performing output control according to the input feedforward mode parameters, and acquiring sampling data from the outside;
s3, completing data acquisition and entering data processing;
s4, adjusting the feedforward control quantity through a feedforward filtering algorithm, and processing data influenced by the fluctuation of the bus load;
s5, using the updated feedforward control data, the method enters the feedforward filtering algorithm in the step S4 again, according to the set test times, the test is completed, and the data are output through communication.
2. The method for testing the internal resistance of the component-capacitive power supply according to claim 1, wherein the sampling system comprises a sampling chip, a communication circuit, an operational amplifier circuit, a filter circuit and a protection circuit.
3. The internal resistance testing method based on the chemical composition capacity power supply as claimed in claim 2, wherein the sampling system samples the operation parameters of the main circuit of the power supply and the state of the power battery, receives the working mode and the initialization configuration information from the system software, transmits the sampling data to the main control system through SPI communication, and uploads the sampling data in real time after the successful operation.
4. The method for testing internal resistance of a component-capacitive power supply according to claim 1, wherein in step S1, if the operation is successful, data is integrated and input to the feed-forward modeling module as initialization data; the feedforward control feeds data to the CLA kernel, entering CLA control.
5. The method according to claim 1, wherein in S3, the processing result is used for subsequent PI control and parameter optimization, and the subsequent PI control controls the circuit in a stable state and outputs the optimized parameter.
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| CN1181356C (en) * | 2001-09-12 | 2004-12-22 | 广州擎天实业有限公司电工分公司 | Auto asynchronous battery grading method |
| US10693415B2 (en) * | 2007-12-05 | 2020-06-23 | Solaredge Technologies Ltd. | Testing of a photovoltaic panel |
| CN102437629B (en) * | 2011-11-01 | 2013-07-24 | 电子科技大学 | Battery charging control device |
| CN102723762A (en) * | 2012-02-15 | 2012-10-10 | 西安胜唐电源有限公司 | Lithium ion storage battery formation circuit |
| CN203178367U (en) * | 2012-12-28 | 2013-09-04 | 深圳市沃特玛电池有限公司 | Internal resistance measuring circuit of battery capacity grading cabinet |
| CN206583938U (en) * | 2017-03-03 | 2017-10-24 | 惠州市鼎力智能科技有限公司 | Test switching circuit for component capacitive equipment |
| CN106932731A (en) * | 2017-05-05 | 2017-07-07 | 江苏金帆电源科技有限公司 | The detection method of each accumulator internal resistance in a kind of series-connected batteries |
| CN107231089B (en) * | 2017-05-23 | 2020-04-10 | 中国农业大学 | Bidirectional three-level H-bridge non-isolated DC-DC converter |
| CN108732524B (en) * | 2018-07-06 | 2020-01-03 | 山东大学 | Automatic calibration circuit and system for formation and grading test power supply |
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