CN117491881A - Method and system for evaluating low-temperature performance matching performance of anode and cathode of lithium ion battery - Google Patents
Method and system for evaluating low-temperature performance matching performance of anode and cathode of lithium ion battery Download PDFInfo
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 67
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000012360 testing method Methods 0.000 claims abstract description 18
- 238000011156 evaluation Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 abstract description 12
- 238000005457 optimization Methods 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 7
- 238000011056 performance test Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000001453 impedance spectrum Methods 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000006467 substitution reaction 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]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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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
- G01R31/003—Environmental or reliability tests
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only voltage measurements
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a method and a system for evaluating low-temperature performance matching of a positive electrode and a negative electrode of a lithium ion battery, wherein the method comprises the following steps: the lithium ion battery to be evaluated is manufactured into a three-electrode battery; the lithium ion battery with the three electrodes is subjected to charge and discharge test at normal temperature, and potential values between the positive electrode and the reference electrode and between the negative electrode and the reference electrode are collected and recorded in the test process; charging and discharging the battery under the low-temperature condition by adopting the current same as normal temperature, and recording the potential of the positive electrode and the negative electrode; and judging that the electrode limits the low-temperature performance of the lithium ion battery according to the fact that the potential of the positive electrode or the negative electrode reaches the potential when normal-temperature charge and discharge are ended, and matching the positive electrode and the negative electrode when the positive electrode and the negative electrode reach the same time. The invention solves the technical problems of overlarge redundancy of battery design, unmatched low-temperature performance of the anode and the cathode, and difficult evaluation and optimization of the low-temperature performance weak links of the anode and the cathode of the battery.
Description
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a method and a system for evaluating low-temperature performance matching of an anode and a cathode of a lithium ion battery.
Background
Under the low temperature condition, the activity of various active materials of the lithium battery is reduced, the reaction rate of the battery electrode is low, the battery performance is very low, the actual charge quantity is small, and the service time of the battery is shortened during use.
The traditional lithium ion battery development means is to take the battery as an integral research, and the rationality of the battery design is reversely pushed through the appearance of the battery performance, and the method can often cause the conditions of uneven capacity and overlarge local redundancy among all components in the battery. Therefore, a method for evaluating the low-temperature performance matching performance of the lithium ion battery is needed, each component in the battery is separately researched, the weak link of the battery is found under the working condition state, the design is optimized, and the low-temperature characteristic and the energy density of the battery are comprehensively and uniformly improved.
The prior invention patent application publication No. CN106707185A discloses a method for evaluating the performance of a soft package lithium ion secondary battery, which comprises the following steps: manufacturing a three-electrode cell, wherein the three-electrode cell comprises a positive electrode and a negative electrode which are connected with a pole group and a reference electrode which is isolated from the pole group through a diaphragm; electrochemical impedance spectrum tests are carried out on three stages of the three-electrode cell before, during and after differentiation, and electrochemical impedance spectrums of the whole cell and the positive electrode and the negative electrode are respectively tested by connecting the positive electrode with the negative electrode, the positive electrode with the reference electrode and the negative electrode with the reference electrode in each stage: connecting electrodes before and after the electrochemical performance test in the electrode connection mode to obtain the electrochemical impedance maps of the whole battery cell, the anode and the cathode before and after the electrochemical performance test; and analyzing electrochemical impedance maps before, during and after formation and before and after electrochemical performance test, and establishing a relation model of manufacturing process map data and electrochemical performance. In the prior art, a three-electrode cell is manufactured by using a metal lithium foil as a reference electrode, electrochemical impedance maps of the whole cell, the anode and the cathode at different stages of testing formation and electrical performance are tested, and a relation model of manufacturing process map data and electrochemical performance can be established, but an analysis method and an analysis effect are not mentioned.
In summary, the prior art has the technical problems that the redundancy of the battery design is overlarge, the low-temperature performance of the anode and the cathode is not matched, and the evaluation and the optimization of the low-temperature performance weak links of the anode and the cathode of the battery are difficult.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: how to solve the technical problems of overlarge redundancy, unmatched low-temperature performance of the anode and the cathode of the battery and difficult evaluation and optimization of weak links of the low-temperature performance of the anode and the cathode of the battery.
The invention adopts the following technical scheme to solve the technical problems: the method for evaluating the low-temperature performance matching performance of the anode and the cathode of the lithium ion battery comprises the following steps:
s1, manufacturing a three-electrode battery by using a lithium ion battery to be evaluated, and monitoring and recording a potential value between a positive electrode and a reference electrode and a potential value between a negative electrode and the reference electrode by using a data acquisition device according to first temperature charging and discharging operations performed on the lithium ion battery to be evaluated by using preset battery charging and discharging equipment under a first temperature condition;
and S2, under a second temperature condition, performing second temperature charge and discharge operation on the three-electrode battery, recording a potential value between the positive electrode and the reference electrode and a potential value between the negative electrode and the reference electrode, processing according to the potential value to obtain an electrode limiting the charge and discharge low-temperature performance of the lithium ion battery, and judging to obtain a positive electrode and negative electrode charge and discharge low-temperature performance matching evaluation result.
The invention can accurately judge the weak links affecting the low-temperature characteristics of the lithium ion battery, pointedly optimize the battery design and regulate and control the lithium ion battery system with the best matching degree.
In a more specific technical solution, step S1 includes:
s11, the potential value between the positive electrode and the reference is recorded as Vp, and the potential value between the negative electrode and the reference is recorded as Vn;
s12, the positive electrode potential at the time of charging termination is recorded as VpC, and the negative electrode potential at the time of charging termination is recorded as VnC;
s13, the positive electrode potential at the end of discharge is denoted by VpD, and the negative electrode potential at the end of discharge is denoted by VnD.
In a more specific technical solution, in step S1, a sampling time selection range of the data acquisition device includes: [0.01s,10s ].
In a more specific technical scheme, in step S1, before testing a three-electrode battery, charging the three-electrode battery according to a preset charging current, and discharging the battery according to a preset discharging current; charge and discharge cycle three times; each cycle is one hour apart.
In a more specific technical scheme, in the discharging operation, the range of values of each interval time includes: the first temperature is normal temperature (25+ -3) deg.C, and the second temperature is low temperature of-10deg.C to-40deg.C.
In a more specific technical scheme, in step S2, the charging and discharging currents of the second temperature charging and discharging operation are consistent with those of the first temperature charging and discharging operation.
In a more specific technical solution, step S2 includes:
s21, under a second temperature condition, carrying out a charging test on the three-electrode battery;
s22, when the positive electrode potential reaches the positive electrode potential VpC at the time of normal-temperature charging termination, determining that the electrode limiting the low-temperature performance of the lithium ion battery is the positive electrode;
and S23, judging that the low-temperature performance electrode for limiting the charging of the lithium ion battery is the negative electrode when the negative electrode potential reaches the negative electrode potential VnC at the time of normal-temperature charging termination.
In a more specific technical scheme, in step S2, when the positive electrode and the negative electrode reach the positive electrode potential VpC at the time of normal-temperature charging termination and the negative electrode potential VnC at the time of normal-temperature charging termination, the lithium ion battery to be evaluated determines that the charging low-temperature performances of the positive electrode and the negative electrode are mutually matched.
In a more specific technical solution, step S2 further includes:
s21', discharge testing under a second temperature condition;
s22', when the positive electrode potential reaches the positive electrode potential VPD at the time of normal-temperature discharge termination, determining that the electrode limiting the discharge low-temperature performance of the lithium ion battery is positive;
s23', when the negative electrode potential reaches the negative electrode potential VnD at the time of normal-temperature discharge termination, judging that the electrode limiting the discharge low-temperature performance of the lithium ion battery is a negative electrode;
and S24', when the positive electrode and the negative electrode reach the positive electrode potential VPD at the time of normal-temperature discharge termination and the negative electrode potential VnD at the time of normal-temperature discharge termination, judging that the discharge low-temperature performances of the positive electrode and the negative electrode are mutually matched.
The invention can accurately judge the weak links affecting the low-temperature characteristics of the lithium ion battery, pointedly optimize the battery design and regulate the lithium ion battery system with the best low-temperature performance matching degree.
In a more specific technical scheme, the lithium ion battery anode-cathode low-temperature performance matching evaluation system comprises:
the charge and discharge testing module is used for manufacturing a three-electrode battery by utilizing a lithium ion battery to be evaluated, carrying out first temperature charge and discharge operation on the lithium battery to be evaluated under a first temperature condition by utilizing preset battery charge and discharge equipment, and monitoring and recording potential values between the positive electrode and a reference and potential values between the negative electrode and the reference by utilizing data acquisition equipment;
and the weak electrode and matching result determining module is used for performing second temperature charging and discharging operation on the three-electrode battery under a second temperature condition, recording positive electrode potential and negative electrode potential, processing to obtain a low-temperature performance electrode limiting the charging of the lithium ion battery, judging and obtaining a low-temperature performance matching evaluation result when the positive electrode and the negative electrode are charged, and connecting the weak electrode and matching result determining module with the charging and discharging testing module.
Compared with the prior art, the invention has the following advantages:
the invention can accurately judge the weak links affecting the low-temperature characteristics of the lithium ion battery, pointedly optimize the battery design and regulate and control the lithium ion battery system with the best matching degree.
According to the invention, the three-electrode battery is manufactured, the charge and discharge of the battery at low temperature are carried out, the positive and negative electrode potentials are monitored, and according to which electrode potential reaches the potential when normal-temperature charge and discharge is ended, the electrode is judged to limit the low-temperature performance of the lithium ion battery, and the low-temperature performance of the battery is a weak link, so that the design of the battery is optimized, the redundancy of the design of the battery is avoided, and the energy density of the battery is improved while the low-temperature performance of the battery is effectively improved.
The invention solves the technical problems of overlarge redundancy, unmatched low-temperature performance of the anode and the cathode, and difficult evaluation and optimization of the low-temperature performance weak links of the anode and the cathode of the battery in the prior art.
Drawings
Fig. 1 is a schematic diagram of basic steps of a method for evaluating low-temperature performance matching of an anode and a cathode of a lithium ion battery in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram showing the steps for analyzing the weak links for limiting the low-temperature charging capability of the lithium ion battery according to the embodiment 1 of the present invention;
FIG. 3 is a schematic diagram showing the steps for analyzing the weak links for limiting the low-temperature charging capability of the lithium ion battery according to the embodiment 1 of the present invention;
FIG. 4 is a schematic diagram of the charge anode-cathode potential-capacity under different temperature conditions in example 1 of the present invention;
FIG. 5 is a schematic diagram of the potential-capacity of the positive electrode charged under different temperature conditions according to example 1 of the present invention;
FIG. 6 is a schematic diagram of the potential-capacity of the charged anode under different temperature conditions according to example 1 of the present invention;
fig. 7 is a schematic diagram of specific implementation steps of the method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery in embodiment 2 of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
As shown in fig. 1, the method for evaluating the low-temperature performance matching of the anode and the cathode of the lithium ion battery provided by the invention comprises the following basic steps:
s1, manufacturing a lithium ion battery to be evaluated into a three-electrode battery, wherein the lithium ion battery with three electrodes adopts battery charging and discharging equipment to conduct charging and discharging test at normal temperature, and a data acquisition instrument is adopted to monitor and record potential values between an anode and a reference and between a cathode and a reference in the testing process;
in this embodiment, the potential value between the positive electrode and the reference is Vp, the potential value between the negative electrode and the reference is Vn, and the positive and negative electrode potentials are VpC and VnC when charging is terminated, respectively; the positive and negative electrode potentials at the time of discharge termination are VpD and VnD, respectively.
In this embodiment, the sampling time selection range of the data acquisition instrument includes, but is not limited to: [0.01s,10s ].
In this example, the pre-test three electrode cell was charged at a current of 0.33C and cycled 3 times at 1 hour intervals at a current of 0.5C.
And S2, charging and discharging the battery under the low-temperature condition, recording the electrode potential of the anode and the cathode, obtaining the potential when the electrode potential reaches the normal-temperature charge and discharge termination, and judging the low-temperature performance of the extremely-limited lithium ion battery.
In this embodiment, the charge-discharge current is the same as that at normal temperature.
As shown in fig. 2, in this embodiment, for the low-temperature charging performance, the specific steps of analyzing the weak link limiting the low-temperature charging capability of the lithium ion battery include:
s21, performing charging test under a low-temperature condition;
s22, if the positive electrode potential reaches the positive electrode potential VpC when normal-temperature charging is terminated, judging that the lithium ion battery is limited in charging low-temperature performance;
s23, judging that the lithium ion battery is limited in charging low-temperature performance if the negative electrode potential reaches the negative electrode potential VnC when normal-temperature charging is ended at first;
and S24, if the positive electrode and the negative electrode almost reach the positive electrode potential VpC and the negative electrode potential VnC at the normal-temperature charge termination at the same time, judging that the charging low-temperature performances of the positive electrode and the negative electrode are matched with each other.
As shown in fig. 3, 4, 5 and 6, in this embodiment, for the discharging low-temperature performance, the specific steps of analyzing the weak link limiting the low-temperature charging capability of the lithium ion battery further include:
s21', discharge test under low temperature condition;
s22', judging that the lithium ion battery is limited to discharge low-temperature performance if the positive electrode potential reaches the positive electrode potential VPD at the time of normal-temperature discharge termination at first;
s23', judging that the lithium ion battery is limited in discharge low-temperature performance if the negative electrode potential reaches the negative electrode potential VnD at the time of normal-temperature discharge termination at first;
s24', if the positive and negative electrodes almost simultaneously reach the positive electrode potential VpD at the termination of the normal-temperature discharge and the negative electrode potential VnD at the termination of the normal-temperature discharge, it is determined that the discharge low-temperature performances of the positive and negative electrodes match each other.
Example 2
In this example, a lithium ion battery with a reference electrode was fabricated with a rated capacity selected from: 80Ah. According to a 0.33C current charge, a 0.5C current discharge cycle is performed 3 times, each time interval may employ, for example: and 1 hour.
As shown in fig. 7, in this embodiment, the specific implementation steps of the method for evaluating the low-temperature performance matching performance of the positive electrode and the negative electrode of the lithium ion battery include:
s101, charging and discharging the battery by normal-temperature current of 0.5C, and monitoring the potential of the positive electrode and the negative electrode;
s102, the voltage of the rechargeable battery reaches 4.20V, the potential of the negative electrode is 0.05V, and the potential of the positive electrode is 4.25V;
and S103, charging at the same low temperature of-20 ℃, wherein the potential of the negative electrode reaches 0.05V when the charging capacity is 60Ah, the potential of the positive electrode is 4.18V, and if the potential of the positive electrode does not reach 4.25V, the negative electrode is judged to limit the discharge low temperature performance of the lithium ion battery.
In conclusion, the invention can accurately judge the weak links affecting the low-temperature characteristics of the lithium ion battery, pointedly optimize the battery design and regulate the lithium ion battery system with the best matching degree.
According to the invention, the three-electrode battery is manufactured, the charge and discharge of the battery at low temperature are carried out, the positive and negative electrode potentials are monitored, and according to which electrode potential reaches the potential when normal-temperature charge and discharge is ended, the electrode is judged to limit the low-temperature performance of the lithium ion battery, and the low-temperature performance of the battery is a weak link, so that the design of the battery is optimized, the redundancy of the design of the battery is avoided, and the energy density of the battery is improved while the low-temperature performance of the battery is effectively improved.
The invention solves the technical problems of overlarge redundancy, unmatched low-temperature performance of the anode and the cathode, and difficult evaluation and optimization of the low-temperature performance weak links of the anode and the cathode of the battery in the prior art.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the 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 scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for evaluating the low-temperature performance matching property of the anode and the cathode of the lithium ion battery is characterized by comprising the following steps of:
s1, manufacturing a three-electrode battery by using a lithium ion battery to be evaluated, and monitoring and recording a potential value between a positive electrode and a reference electrode and a potential value between a negative electrode and the reference electrode by using a data acquisition device through performing first temperature charging and discharging operation on the lithium battery to be evaluated under a first temperature condition by using a preset battery charging and discharging device;
and S2, under a second temperature condition, performing second temperature charge and discharge operation on the three-electrode battery, recording a potential value between the positive reference electrodes and a potential value between the negative reference electrodes, processing according to the potential values to obtain an electrode limiting the charge and discharge low-temperature performance of the lithium ion battery, and judging to obtain a low-temperature performance matching evaluation result when the positive electrode and the negative electrode are charged.
2. The method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery according to claim 1, wherein the step S1 comprises:
s11, the potential value between the positive electrode and the reference is recorded as Vp, and the potential value between the negative electrode and the reference is recorded as Vn;
s12, the positive electrode potential at the time of charging termination is recorded as VpC, and the negative electrode potential at the time of charging termination is recorded as VnC;
s13, the positive electrode potential at the end of discharge is denoted by VpD, and the negative electrode potential at the end of discharge is denoted by VnD.
3. The method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery according to claim 1, wherein in the step S1, the sampling time of the data acquisition device is selected from the range comprising: [0.01s,10s ].
4. The method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery according to claim 1, wherein in the step S1, before the three-electrode battery is tested, the three-electrode battery is charged according to a preset charging current, and the battery is discharged according to a preset discharging current; charge and discharge cycle three times; each cycle is one hour apart.
5. The method of claim 1, wherein the range of values for each interval in the discharging operation comprises:
the value range of the first temperature comprises: [22 ℃, 28+ ];
the value range of the second temperature comprises: [ -10 ℃, -40 ℃) ].
6. The method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery according to claim 1, wherein in the step S2, the charge and discharge currents of the second-temperature charge and discharge operation are identical to those of the first-temperature charge and discharge operation.
7. The method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery according to claim 1, wherein the step S2 comprises:
s21, under the second temperature condition, carrying out a charging test on the three-electrode battery;
s22, when the positive electrode potential reaches the positive electrode potential VpC at the time of normal-temperature charging termination, judging that the electrode limiting the low-temperature performance of the lithium ion battery charging is the positive electrode;
and S23, judging that the low-temperature performance electrode for limiting the charging of the lithium ion battery is a negative electrode when the negative electrode potential reaches the negative electrode potential VnC at the time of normal-temperature charging termination.
8. The method according to claim 1, wherein in the step S2, when the positive electrode and the negative electrode reach the positive electrode potential VpC at the time of termination of normal-temperature charging and the negative electrode potential VnC at the time of termination of normal-temperature charging, the lithium ion battery to be evaluated is determined that the charging low-temperature performances of the positive electrode and the negative electrode match each other.
9. The method for evaluating the low-temperature performance matching of the positive electrode and the negative electrode of the lithium ion battery according to claim 1, wherein the step S2 further comprises:
s21', discharge testing at the second temperature condition;
s22', when the positive electrode potential reaches the positive electrode potential VPD at the time of normal-temperature discharge termination, judging that the electrode limiting the discharge low-temperature performance of the lithium ion battery is positive;
s23', when the negative electrode potential reaches the negative electrode potential VnD at the time of ending the normal-temperature discharge, judging that the electrode limiting the discharge low-temperature performance of the lithium ion battery is a negative electrode;
and S24', judging that the discharge low-temperature performances of the positive electrode and the negative electrode are matched when the positive electrode and the negative electrode reach the positive electrode potential VPD at the time of normal-temperature discharge termination and the negative electrode potential VnD at the time of normal-temperature discharge termination.
10. Lithium ion battery positive negative pole low temperature performance matching nature evaluation system, its characterized in that, the system includes:
the charge and discharge testing module is used for manufacturing a three-electrode battery by utilizing a lithium ion battery to be evaluated, carrying out first temperature charge and discharge operation on the lithium battery to be evaluated under a first temperature condition by utilizing preset battery charge and discharge equipment, and monitoring and recording potential values between the positive electrode and a reference and potential values between the negative electrode and the reference by utilizing data acquisition equipment;
and the weak electrode and matching result determining module is used for performing second temperature charging and discharging operation on the three-electrode battery under a second temperature condition, recording positive electrode potential and negative electrode potential, processing to obtain a low-temperature performance electrode limiting the charging of the lithium ion battery according to the positive electrode potential and the negative electrode potential, judging and obtaining a low-temperature performance matching evaluation result when the positive electrode and the negative electrode are charged, and the weak electrode and matching result determining module is connected with the charging and discharging testing module.
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| CN202311507887.9A CN117491881A (en) | 2023-11-09 | 2023-11-09 | Method and system for evaluating low-temperature performance matching performance of anode and cathode of lithium ion battery |
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