CN113009367A - Online testing device and method for battery health degree - Google Patents
Online testing device and method for battery health degree Download PDFInfo
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- CN113009367A CN113009367A CN202110202576.6A CN202110202576A CN113009367A CN 113009367 A CN113009367 A CN 113009367A CN 202110202576 A CN202110202576 A CN 202110202576A CN 113009367 A CN113009367 A CN 113009367A
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- 230000036541 health Effects 0.000 title claims abstract description 55
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 27
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000004364 calculation method Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims description 42
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 229910001416 lithium ion Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 238000000691 measurement method Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010219 correlation analysis Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
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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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Abstract
The invention discloses an on-line testing device and method for battery health degree, and belongs to the field of battery health degree testing. The invention aims to solve the problem that the battery in the prior art cannot realize normal work of the battery and realize on-line battery health degree. The invention includes battery management system, battery to be tested and high-speed voltage sampling device, several parallel connection are in connection with the discharge branch circuit of positive and negative pole both ends of the battery to be tested, the battery management system includes: the system comprises a control instruction module, a battery signal collection module, a direct current internal resistance calculation module and a battery health degree calculation module; the method and the device realize high-speed online measurement of the health degree in the working process of the battery.
Description
Technical Field
The invention relates to the field of battery health degree testing, in particular to an online testing device and method for battery health degree.
Background
At present, new energy automobiles at home and abroad are rapidly developed, the demand for batteries is increasingly large, and the requirements for the performance of the batteries are increasingly high. After the power battery is used for a period of time, the performance of the power battery is degraded, so that the test and the evaluation of the degradation degree are very important. In the prior art, in the field of electric vehicles, electric tools and the like, power batteries are applied to a battery system consisting of a plurality of batteries, wherein the battery system consists of a plurality of battery modules, and the battery modules consist of a plurality of battery monomers, so that the consistency of the batteries is an important parameter for describing the performance of the power batteries. The battery management system commonly used in the battery industry at present plays a role in detecting the working state of the battery and monitoring parameters of the battery, such as voltage, current, temperature and the like in real time in the application process of the battery, and when the working state of the battery exceeds a specified value, a sound-light alarm is started to prompt attention. When the charge states of the individual single batteries in the battery pack are inconsistent, the balancing function of the battery management system is started for balancing, so that the single batteries are kept in good consistency. The battery management system with the strong function also has a battery state of charge (SOC) estimation function, and the residual storage capacity of the power battery is calculated in real time.
The invention aims to enable a battery management system to have a power battery health degree evaluation function and provide scientific test data for the gradient utilization and recovery of power batteries.
The health degree of a power battery is an important parameter for describing the service life of the battery, the traditional method for testing the health degree of the power battery is to fully discharge the battery according to a specified current after the battery is fully charged, record the discharge capacity Q1 at the same time, and obtain the health degree of the current power battery by taking the percentage of the ratio of Q1 to the rated capacity of the battery as the health degree of the current power battery. The method needs to perform one-time full charge and one-time full discharge on the battery, thereby wasting a large amount of time and electric energy;
in the process of on-site operation of the battery, the power battery is discharged under a large current without a condition, and the current and voltage are difficult to be selected and sampled accurately and at high speed, so that the online test of the health degree of the power battery becomes a technical problem which is difficult to solve for a long time in the battery industry, namely, the online health degree test of the power battery in the traditional method cannot be realized.
And because the health degree test needs to test the power performance of the power battery under the condition of large current and needs to test the direct current internal resistance of the power battery, the conventional battery management system is difficult to realize and becomes a technical problem which is difficult to solve for a long time in the industry. Therefore, a method for testing the health condition of the power battery on line during work is urgently needed in the power battery industry, so that the power battery system can be maintained and replaced in time according to the health degree test result, and the safety and the service life of the power battery are ensured.
Disclosure of Invention
In order to solve the problems, the invention provides an online testing device and method for the health degree of a battery, which realize high-speed online measurement of the health degree of the battery in the working process.
The invention provides a battery health degree online testing device in a first aspect, which comprises a battery management system, a battery to be tested, a high-speed voltage sampling device and a plurality of discharging branches connected in parallel at the two ends of the anode and the cathode of the battery to be tested, wherein the battery management system comprises:
the control instruction module sends a control instruction to the discharging branch circuit to enable the discharging branch circuit to be connected or disconnected;
the battery signal collection module is used for collecting the current value of the discharge branch and the battery terminal voltage value under the current condition;
the direct current internal resistance calculation module is used for obtaining the equivalent internal resistance of the battery according to the current variation of each discharging branch and the variation of the terminal voltage of the battery;
a battery health calculation module that calculates a battery health SOHR according to the following equation:
SOHR＝1-(RDN-RD0)/RD0；
wherein R isD0Is the DC internal resistance R of the battery when leaving factoryDNThe equivalent internal resistance is obtained by adopting an online testing device with N branches.
Furthermore, the discharge branch comprises a discharge resistor, an electronic switch and a high-speed current collecting device which are sequentially connected in series.
Furthermore, the number of the discharge branches is more than or equal to 1.
Further, the equivalent internal resistance RDNComprises the following steps:
RDN＝(V2-V1)/(I2-I1)；
wherein, V1And I1The voltage and the current when the N discharging branches are disconnected; v2And I2The voltage and the current when the N discharge branches are switched on are obtained.
Furthermore, the battery to be tested is a single battery or a battery pack formed by connecting the single batteries in series and in parallel.
Furthermore, the battery to be tested is a lead-acid battery, a cadmium-nickel battery, a nickel-hydrogen battery, a lithium ion battery or a battery with a working principle based on a chemical power supply technology.
The second aspect of the present invention provides a method for online measuring battery health degree, which is implemented based on the device for online measuring battery health degree of the first aspect of the present invention, and comprises the following steps:
sending a control instruction to the discharging branch circuit to enable the discharging branch circuit to be connected or disconnected;
collecting a current value of a discharging branch and a battery terminal voltage value under the current condition;
obtaining the equivalent internal resistance of the battery according to the current variation of each discharging branch and the variation of the terminal voltage of the battery;
the battery health SOHR is calculated according to the following formula:
SOHR＝1-(RDN-RD0)/RD0；
wherein R isD0Is the DC internal resistance R of the battery when leaving factoryDNThe equivalent internal resistance is obtained by adopting an online testing device with N branches.
As described above, the online testing device and method for battery health degree provided by the present invention have the following effects:
1. the invention tests the health degree of the power battery pack when the power battery works on line, carries out instant heavy current discharge on the battery pack by adopting the discharge resistor controlled by the battery management system, collects the discharge current and the terminal voltage change of the battery pack at high speed, and obtains the direct current internal resistance health degree parameter of the power battery through analysis and calculation. The method for testing the health degree of the battery has strong operability, is easy to build the battery testing device, and has the characteristics of simple operation and strong feasibility.
2. The invention realizes the real-time health degree test of the battery to be tested under the normal working state without influencing the power battery.
3. The invention does not need to carry out full charging and full discharging operation on the power battery in the working process, saves a large amount of electric energy, consumes less energy and achieves the effects of energy conservation and emission reduction.
4. The method has high measurement speed, the traditional full charge-discharge method is about three hours at a time, and the method can be finished in only a few seconds.
5. The invention has high test accuracy, and the input and output signals of the battery contain large amount of information, thereby comprehensively reflecting the internal parameters and the characteristics of the battery.
Drawings
FIG. 1 is a schematic structural diagram of an on-line battery health testing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a battery management system according to an embodiment of the present invention;
fig. 3 is a flowchart of a battery health online testing method according to an embodiment of the invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
In the prior art, the two most important indexes for measuring the health index of the battery are capacity and internal resistance, and the internal resistance deterioration causes short discharging and charging time, and also causes the battery to work and generate heat and the power to be reduced. The internal resistance therefore occupies a major factor in the evaluation of the battery health. Especially under the condition of 'on-line measurement', the capacity measurement is difficult to realize, and the internal resistance degradation is very similar to the change rule and the time length of capacity attenuation.
As shown in fig. 1, the battery health online testing device of the present embodiment includes:
battery management system 100, battery management system 100 carries out monomer voltage sampling, monomer current sampling, temperature sampling and balanced control to the battery that awaits measuring and carries out conventional management, battery management system 100 includes:
the control instruction module 101 is used for sending a control instruction to the discharging branch circuit to enable the discharging branch circuit to be switched on or switched off;
the battery signal collection module 102 is used for collecting a current value of a discharging branch and a battery terminal voltage value under the current condition;
the direct current internal resistance calculation module 103 is used for obtaining the equivalent internal resistance of the battery according to the current variation of each discharging branch and the variation of the terminal voltage of the battery;
the battery health calculation module 104 calculates a battery health SOHR according to the following equation:
SOHR＝1-(RDN-RD0)/RD0；
wherein R isD0Is the DC internal resistance R of the battery when leaving factoryDNFor using N branches on-lineAnd testing the equivalent internal resistance obtained by the device.
The battery management system 100 employed in the present embodiment is a domestic ZM-300BMS-100A universal battery management system.
The invention relates to a battery 200 to be tested, which is a single battery or a battery pack formed by connecting single batteries in series and in parallel, wherein the battery to be tested is a lead-acid battery, a cadmium-nickel battery, a nickel-hydrogen battery, a lithium ion battery or a battery with a working principle based on a chemical power supply technology.
The high-speed voltage sampling device 300 is used for collecting the terminal voltage of the battery, and the high-speed voltage sampling device adopted in the implementation is an AD9643-250 analog-to-digital converter, and the sampling speed can reach 20 milliseconds.
The first discharging branch 400 and the second discharging branch 500 are connected in parallel to the positive and negative terminals of the battery to be tested, as shown in the figure, the first discharging branch 400 includes a discharging resistor 401, a first electronic switch 402 and a first high-speed current sampling device 403 which are connected in series, the second discharging branch 500 includes a discharging resistor 501, a second electronic switch 502 and a second high-speed current sampling device 503 which are connected in parallel, during measurement, the battery management system 100 sends a switching instruction to the first electronic switch 402 and the second electronic switch 502, and the first high-speed current sampling device 403 and the second high-speed current sampling device 503 collect the currents of the branches and transmit the currents to the battery management system 100 for calculating the equivalent internal resistance of the battery.
In this embodiment, the discharging resistor 401 is a 1.0 Ω/200W winding resistor, the discharging resistor 501 is a 0.5 Ω/200W winding resistor, and the first electronic switch 402 and the second electronic switch 502 are the siemens IGBT module BSM50GAL 120. The first high-speed current sampling device 403 and the second high-speed current sampling device 503 adopt I200ACE-P1-01 high-speed current transmitters, the response time can reach 10 microseconds, and the requirements on sampling precision and speed are met.
After the circuit is completed as shown in fig. 1, the battery management system 100 sends out a control signal to close the first electronic switch 402 and the second electronic switch 502 for a period T, and when the electronic switches are closedDuring the time, the battery 200 to be tested discharges with large current through the discharge resistors 401 and 501, which is equivalent to a negative pulse signal as an input signal applied to the positive and negative electrodes of the power battery pack. Meanwhile, the battery management system 100 starts the high-speed voltage sampling device 300 and the high-speed current sampling devices 403 and 503 to collect the terminal voltage and the output current of the battery 200 to be tested, and calculates the terminal voltage V through analysis2And an output current I2(ii) a The battery management system sends out a control signal to turn off the first electronic switch 402 and the second electronic switch 502 for a period T, and when the electronic switches are turned off, the battery management system 100 simultaneously starts the high-speed voltage sampling device 300, the high-speed current sampling devices 403 and 503 to collect the terminal voltage V of the battery 200 to be tested1And an output current I1The ohmic internal resistance, the polarization internal resistance, the direct current internal resistance and the health degree of the battery 200 to be tested can be accurately calculated.
The logging frequency of the internal resistance data of the battery is controlled by the BMS, the internal resistance of the battery changes slowly, the health degree of the battery also changes slowly, frequent measurement is not needed, the logging frequency of the data is usually once every 1 day, the workload of the BMS can be reduced, and the testing period can be prolonged or shortened by modifying the BMS software according to the condition that the battery to be tested is not used.
Based on the online measurement device for the battery health degree, the online measurement method for the battery health degree of the embodiment comprises the following steps:
s1, sending a control instruction to the discharging branch circuit to enable the discharging branch circuit to be switched on or switched off;
the control instruction module 101 of the battery management system 100 sends a switch control instruction to control the first electronic switch 402 to be turned off after being turned on for 3 seconds, when the first electronic switch 402 is turned on, the current of the battery 200 to be tested returns to the negative electrode of the battery from the positive electrode through the high-speed voltage sampling device 300, and simultaneously the battery management system 100 receives the battery terminal voltage V1 collected by the high-speed voltage sampling device 300, and simultaneously the current returns to the negative electrode of the battery to be tested through the first discharge resistor 401, the first electronic switch 402 and the first high-speed current sampling device 403, at this time, when the direct current internal resistance of the battery 200 to be tested is not considered, the magnitude of the discharge current is determined by the voltage of the power battery pack and the resistance value of the discharge resistor 301, namely, the current is 24V/1.0 Ω, and. When the internal resistance of the power battery is considered, the terminal voltage V1 of the power battery is less than 24V, the actual current I1 is equal to V1/1.0 Ω, and the battery management system 100 stores the actual current I1.
The control command module 101 of the battery management system 100 sends a switch command to control the second electronic switch 502 to be turned on for 3 seconds and then turned off, and when the second electronic switch 502 is turned on, the current of the battery 100 to be tested returns to the negative terminal of the battery 100 to be tested after passing through the high-speed voltage sampling device 300 from the positive electrode, the battery management system collects the current terminal voltage V2 of the battery 100 to be tested, meanwhile, the current returns to the negative electrode of the battery 100 to be tested through the second discharge resistor 501, the second electronic switch 502 and the second high-speed power sampling device 503, when the direct-current internal resistance of the power battery pack is not considered, the magnitude of the discharge current is determined by the voltage of the power battery pack and the resistance value of the discharge resistor 501, i.e., the current is 24V/0.5 omega, the size is 48A, when the internal resistance of the power battery is considered, the terminal voltage V2 of the power battery is further less than 24V, the actual current I2 is V2/0.5 Ω, and the battery management system 100 stores the actual current I2 at this time.
The embodiment is based on the electrochemical working principle of the power battery, when different signals are input, the battery is used as an electrochemical system, electrochemical reaction is generated inside the battery, and the characteristics of the reaction represent the characteristics of the battery. Various characteristic parameters inside the battery, including battery material composition, capacity, power characteristics, internal resistance, battery state of health, etc., can be reflected to a large extent. And exciting the battery by using different signal currents, and analyzing and calculating the required performance parameters of the power battery according to the response parameters of the measured battery voltage. The analysis and calculation method can adopt optimization algorithms such as differentiation, integration, correlation analysis algorithm, gradient method and the like in the automatic control field to determine the internal parameters of the battery. The purpose of testing the performance of the battery is achieved.
S2, collecting the current value of the discharging branch and the battery terminal voltage value under the current condition, where the battery signal receiving module 102 receives the terminal voltage and the actual current value obtained by the high-speed voltage sampling device and the high-speed current sampling device when the first discharging branch and the second discharging branch are closed.
S3, obtaining the equivalent internal resistance of the battery according to the current variation of each discharging branch and the variation of the battery terminal voltage;
in the embodiment, 2 branches are adopted to determine the equivalent internal resistance R of the battery in the current stateD2Comprises the following steps:
RD2＝(V2-V1)/(I2-I1)；
wherein V is1、I1Voltage and current when 2 branches are disconnected; v2、I2The voltage and current when 2 branches are switched on.
S4, calculating the SOHR according to the following formula:
SOHR＝1-(RD2-RD0)/RD0；
wherein R isD0Is the DC internal resistance R of the battery when leaving factoryD2The equivalent internal resistance is obtained by adopting an online testing device with 2 branches.
In practical application, the number of the discharge branches can be set as appropriate for different power battery systems and different requirements of measurement accuracy, and can be 1, 2 or 3 or more, the more the discharge branches are, the more the acquired data is, the higher the accuracy of the obtained battery health degree value is, but for some conditions with relatively low requirements on the accuracy of the health degree value, one discharge branch can be completely adopted for measurement.
When a plurality of branches are used, the discharge resistance of each branch is generally set to a resistance sequence spanning an order of 10K, 1K, 100 ohms, 10 ohms, 1 ohm, 0.5 ohms, 0.1 ohms. The specific resistance value is flexibly adjusted according to the measurement requirement, and the accurate and adjustable excitation current of the battery to be measured can be realized by only using a plurality of IO signals of the BMS. The accurate 1A- >100mA- >1mA adjustable current is given by an I/O pin of the BMS to realize the measurement of the battery performance and achieve the purpose of saving the hardware cost.
In a specific embodiment, when the number of the discharging branches is 4, the equivalent internal resistance R isD4Comprises the following steps:
RD4＝(V2-V1)/(I2-I1)；
wherein V1、I1Measured voltage and current for the 4 branches disconnected; v2、I2The measured voltage and current at which the 4 branches were switched on.
When four discharging branches are used, the obtained SOHR is as follows:
SOHR＝1-(RD4-RD0)/RD0；
wherein R isD4The equivalent internal resistance is obtained by adopting an online testing device with 2 branches.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a battery health degree on-line measuring device, includes battery management system, the battery that awaits measuring and high-speed voltage sampling device, its characterized in that still includes a plurality of parallelly connected connection and is in the branch road that discharges at the positive negative pole both ends of the battery that awaits measuring, battery management system includes:
the control instruction module sends a control instruction to the discharging branch circuit to enable the discharging branch circuit to be connected or disconnected;
the battery signal collection module is used for collecting the current value of the discharge branch and the battery terminal voltage value under the current condition;
the direct current internal resistance calculation module is used for obtaining the equivalent internal resistance of the battery according to the current variation of each discharging branch and the variation of the terminal voltage of the battery;
a battery health calculation module that calculates a battery health SOHR according to the following equation:
SOHR＝1-(RDN-RD0)/RD0；
wherein R isD0Is the DC internal resistance R of the battery when leaving factoryDNThe equivalent internal resistance is obtained by adopting an online testing device with N branches.
2. The on-line battery health measuring device of claim 1, wherein the discharging branch comprises a discharging resistor, an electronic switch and a high-speed current collecting device connected in series in sequence.
3. The on-line battery health measuring device of claim 1, wherein the number of the discharging branches is greater than or equal to 1.
4. The on-line battery health measurement device of claim 1, wherein the equivalent internal resistance RDNComprises the following steps:
RDN＝(V2-V1)/(I2-I1)；
wherein, V1And I1The voltage and the current when the N discharging branches are disconnected; v2And I2The voltage and the current when the N discharge branches are switched on are obtained.
5. The device of claim 1, wherein the battery to be measured is a single battery or a battery pack formed by connecting single batteries in series and parallel.
6. The device of claim 1, wherein the battery to be measured is a lead-acid battery, a cadmium-nickel battery, a nickel-hydrogen battery, a lithium-ion battery or a battery whose working principle is based on chemical power technology.
7. An online battery health degree measurement method, which is realized based on the online battery health degree measurement device of any one of claims 1 to 6, and comprises the following steps:
sending a control instruction to the discharging branch circuit to enable the discharging branch circuit to be connected or disconnected;
collecting a current value of a discharging branch and a battery terminal voltage value under the current condition;
obtaining the equivalent internal resistance of the battery according to the current variation of each discharging branch and the variation of the terminal voltage of the battery;
the battery health SOHR is calculated according to the following formula:
SOHR＝1-(RDN-RD0)/RD0；
wherein R isD0Is the DC internal resistance R of the battery when leaving factoryDNThe equivalent internal resistance is obtained by adopting an online testing device with N branches.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777501A (en) * | 2021-09-29 | 2021-12-10 | 东方电气集团科学技术研究院有限公司 | SOH estimation method of battery module |
| CN115036590A (en) * | 2022-03-29 | 2022-09-09 | 东莞新能安科技有限公司 | Secondary battery internal resistance detection method and device and electronic equipment |
| CN115308612A (en) * | 2022-08-02 | 2022-11-08 | 宁波拜特测控技术股份有限公司 | Module battery deep over-discharge testing system and method |
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