CN117289151A - Battery electrical performance testing method and system - Google Patents
Battery electrical performance testing method and system Download PDFInfo
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- CN117289151A CN117289151A CN202311255647.4A CN202311255647A CN117289151A CN 117289151 A CN117289151 A CN 117289151A CN 202311255647 A CN202311255647 A CN 202311255647A CN 117289151 A CN117289151 A CN 117289151A
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- 238000012360 testing method Methods 0.000 title claims abstract description 86
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000012544 monitoring process Methods 0.000 claims abstract description 24
- 238000007599 discharging Methods 0.000 claims abstract description 15
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000011056 performance test Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000011159 matrix material Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 238000005056 compaction Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000013508 migration Methods 0.000 description 2
- 230000005012 migration Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000003475 lamination Methods 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
- 239000007773 negative electrode material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- 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
-
- 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 a battery electrical performance test method and a system, wherein the method comprises the following steps: respectively arranging reference electrodes at a plurality of positions of a negative electrode plate of the three-electrode battery; performing charging test on the three-electrode battery with a first preset multiplying power, and monitoring the potential of a plurality of reference electrodes in the charging test process; calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good; charging and discharging the three-electrode battery by using currents with different multiplying powers, monitoring the potential of the negative electrode by using a reference electrode, wherein the charging end negative electrode potential is reduced to zero, and the corresponding charging multiplying power is the maximum multiplying power of the negative electrode; the invention has the advantages that: and the electrical property uniformity and the multiplying power performance of the battery pole piece are accurately analyzed, and the design is optimized in pertinence.
Description
Technical Field
The invention relates to the field of battery testing, in particular to a battery electrical performance testing method and system.
Background
The electrical performance test of the battery includes a uniformity test and a rate performance test. The pole piece is used as an important component of the lithium ion battery, the uniformity of the electrode performance of the pole piece has great influence on the battery, and the electric performance of the whole battery such as rate capability, capacity, lithium precipitation and the like can be influenced by the poor electric performance of the individual position of the pole piece. At present, the uniformity of the thickness of a pole piece is monitored at the end of a coating and rolling process, for example, an electroplating method of a reference electrode and a battery disclosed in Chinese patent publication No. CN115679398A are adopted, and the reference electrode is electroplated at the positive side and the negative side of the battery to be treated, so that a uniform and compact metal coating is formed on the surface of the reference electrode; or calculating the uniformity of the compaction density by adopting a pole piece weighing method. The method for measuring the thickness of the pole piece and calculating the compaction density can only obtain the data of the thickness and the compaction density of the pole piece, but the two parameters cannot accurately represent the uniformity of the electrical performance of the battery pole piece, so that the method has limitations in the aspect of monitoring the uniformity of the electrical performance of the pole piece.
The charge-discharge rate of a lithium ion battery determines how fast it is possible to store certain energy into the battery or how fast it is possible to release energy from the battery. The charge-discharge rate performance of the lithium battery can be influenced by the anode and the cathode as well as the electrolyte. The charge-discharge rate performance of a lithium battery is directly related to the migration capability of lithium ions at the positive electrode, the negative electrode, the electrolyte and the interface between the positive electrode and the negative electrode, and all factors influencing the migration speed of the lithium ions (the influencing factors can be equivalent to the internal resistance of the battery) can influence the charge-discharge rate performance of the lithium battery. The full battery can test the multiplying power performance, only the overall performance can be tested, the multiplying power performance of the anode and the cathode can not be tested, the main factors influencing the multiplying power performance of the battery can not be tested, and the targeted optimal design can not be realized. Thus, each influencing factor needs to be tested separately; the negative electrode is one of the factors, and thus the rate performance of the negative electrode needs to be tested separately.
Disclosure of Invention
The technical problem to be solved by the invention is that the monitoring parameters of the battery electrical performance monitoring method in the prior art cannot accurately represent the electrical performance uniformity of the battery pole piece, have limitations, and cannot test main factors influencing the rate performance of the battery, so that the battery cannot be designed in a targeted and optimized manner.
The invention solves the technical problems by the following technical means: a battery electrical property testing method comprises the following steps:
step a, testing the uniformity of the electrical property of the battery;
respectively arranging reference electrodes at a plurality of positions of a negative electrode plate of the three-electrode battery; performing charging test on the three-electrode battery with a first preset multiplying power, and monitoring the potential of a plurality of reference electrodes in the charging test process; calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good;
step b, testing the multiplying power performance of the battery;
and charging and discharging the three-electrode battery by using currents with different multiplying powers, monitoring the potential of the negative electrode by using a reference electrode, and when the potential of the negative electrode drops to zero after charging, setting the corresponding charging multiplying power as the maximum multiplying power of the negative electrode.
Further, the calculation formula of the variation coefficient is cov=σ/Vi, wherein COV is the variation coefficient, vi is the average value of all the test potentials, σ is the standard deviation of all the test potentials, and the larger the variation coefficient is, the larger the difference of the electrode performance of the electrode plates at different tested positions is indicated.
Further, the three-electrode battery is a laminate or square.
Further, a plurality of reference electrodes are transversely and/or longitudinally arranged on the negative electrode plate of the three-electrode battery.
Furthermore, a plurality of reference electrodes are transversely and/or longitudinally arranged on the negative electrode plate of the three-electrode battery in a matrix arrangement mode.
Further, before the three-electrode battery is subjected to the charging test in the step a, the three-electrode battery is charged according to a first preset current, a second preset current is discharged for a preset number of times, and preset time is spaced each time.
Further, the value range of the first preset current is 0.30-0.36 ℃, the value range of the second preset current is 0.4-0.6 ℃, the preset times are at least 3, and the range of the preset time is 1-2 hours.
Further, the range of the first preset multiplying power is 0.3-3C.
Further, the first preset multiplying power has a value of 0.33C, 0.5C, 1C, 1.5C, 2C or 2.5C.
Further, before charging and discharging the three-electrode battery with the current with different multiplying power in the step b, the method comprises the following steps:
and charging and discharging the battery for a plurality of times by adopting a third preset current, wherein each cycle is at preset time intervals.
Further, the step b includes:
and (3) starting to perform charge and discharge test on the three-electrode battery from the current of the second preset multiplying power, monitoring the potential of the negative electrode, if the potential is always greater than zero, increasing the current to perform test, and when the potential of the negative electrode reaches zero when charging is not finished, reducing the multiplying power of the charging current to the third preset multiplying power to perform test continuously.
The invention also provides a battery electrical property test system, comprising:
the uniformity judging module is used for respectively arranging reference electrodes at a plurality of positions of a negative electrode plate of the three-electrode battery; performing charging test on the three-electrode battery with a first preset multiplying power, and monitoring the potential of a plurality of reference electrodes in the charging test process; calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good;
and the multiplying power performance testing module is used for charging and discharging the three-electrode battery by using different multiplying power currents, monitoring the potential of the negative electrode by using the reference electrode, and when the potential of the negative electrode drops to zero after charging, the corresponding charging multiplying power is the maximum multiplying power of the negative electrode.
Further, the calculation formula of the variation coefficient is cov=σ/Vi, wherein COV is the variation coefficient, vi is the average value of all the test potentials, σ is the standard deviation of all the test potentials, and the larger the variation coefficient is, the larger the difference of the electrode performance of the electrode plates at different tested positions is indicated.
Further, the three-electrode battery is a laminate or square.
Further, a plurality of reference electrodes are transversely and/or longitudinally arranged on the negative electrode plate of the three-electrode battery.
Furthermore, a plurality of reference electrodes are transversely and/or longitudinally arranged on the negative electrode plate of the three-electrode battery in a matrix arrangement mode.
Further, before the uniformity judging module performs a charging test on the three-electrode battery, the three-electrode battery is charged according to a first preset current, a second preset current is discharged for a preset number of times, and preset time is spaced each time.
Further, the value range of the first preset current is 0.30-0.36 ℃, the value range of the second preset current is 0.4-0.6 ℃, the preset times are at least 3, and the range of the preset time is 1-2 hours.
Further, the range of the first preset multiplying power is 0.3-3C.
Further, the first preset multiplying power has a value of 0.33C, 0.5C, 1C, 1.5C, 2C or 2.5C.
Further, before the three-electrode battery is charged and discharged by using the currents with different multiplying powers in the multiplying power performance testing module, the multiplying power performance testing module comprises:
and charging and discharging the battery for a plurality of times by adopting a third preset current, wherein each cycle is at preset time intervals.
Further, the rate performance test module is further configured to:
and (3) starting to perform charge and discharge test on the three-electrode battery from the current of the second preset multiplying power, monitoring the potential of the negative electrode, if the potential is always greater than zero, increasing the current to perform test, and when the potential of the negative electrode reaches zero when charging is not finished, reducing the multiplying power of the charging current to the third preset multiplying power to perform test continuously.
The invention has the advantages that:
(1) According to the invention, the counter electrode is provided with the plurality of reference electrodes, the variation coefficient is calculated according to the potential of the reference electrodes, the electrical property uniformity of the negative electrode plate is judged according to the variation coefficient, and the difference of the potentials at different positions can be accurately reflected through the variation coefficient, so that the electrical property uniformity of the battery electrode plate is accurately reflected. And the three-electrode battery is charged and discharged by using the currents with different multiplying powers, the potential of the negative electrode after the charging is reduced to zero, the corresponding charging multiplying power is the maximum multiplying power of the negative electrode, and the main factors influencing the multiplying power performance of the battery are effectively tested, so that the specific optimization design is realized.
(2) According to the invention, through accurately testing the uniformity of the electrical performance of the battery negative electrode plate, the position of weak electrical performance in the electrode plate can be found, so that the accurate optimization of design and manufacturing process parameters is facilitated.
(3) According to the invention, through accurately testing the uniformity of the battery negative electrode plate electrode performance, defects of the slurry mixing and coating processes can be timely found and timely optimized, and whether the battery assembly process has abnormality and abnormal positions can be also found, so that the battery production efficiency and the yield are improved.
(4) The invention uses the current of different multiplying power to charge and discharge the three-electrode battery, takes the corresponding charging multiplying power when the potential of the charged negative electrode drops to zero as the maximum multiplying power of the negative electrode, can test the multiplying power of the negative electrode under the conditions of different temperatures, different negative electrode materials and different manufacturing process parameters, avoids the influence of other factors such as the positive electrode and the like, and can purposefully optimize design and set reasonable charging process parameters according to the parameters of the three-electrode battery under the maximum multiplying power, optimize the battery performance and improve the quality of the battery.
Drawings
Fig. 1 is a flowchart of a battery electrical performance testing method disclosed in embodiment 1 of the present invention;
fig. 2 is a schematic diagram showing a reference electrode setting position in a battery electrical performance test method according to embodiment 1 of the present invention;
FIG. 3 is a graph showing the variation of the charge current 0.33C negative electrode potential with the SOC in the method for testing the electrical performance of a battery according to embodiment 2 of the present invention;
fig. 4 is a plot of the charge current 2C negative electrode potential versus SOC in a method for testing battery electrical performance according to 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 and 2, embodiment 1 of the present invention provides a method for testing electrical performance of a battery, which mainly tests electrical performance uniformity of the battery, and mainly includes the following steps:
s101, manufacturing a three-electrode battery by using a certain type of laminated 100AH battery, wherein the three-electrode battery comprises a negative electrode plate 1 and a plurality of reference electrodes, the plurality of reference electrodes are respectively arranged corresponding to any 12 positions of the negative electrode plate 1 in FIG. 2, the battery is manufactured according to a normal battery manufacturing process, a schematic diagram of the negative electrode plate 1 of the three-electrode battery in the prior art is shown in FIG. 2, two lugs 2 are arranged on the side edge of the negative electrode plate 1, monitoring positions 3 arranged on the surface of the negative electrode plate 1 in practical application can be in matrix arrangement, or can be in simple linear arrangement, irregular arrangement, circular array arrangement and the like, the number of the monitoring positions 3 is not particularly limited, and the number of the monitoring positions 3 is adjusted according to practical conditions, and in the embodiment, 20 monitoring positions 3 in matrix arrangement are arranged on the surface of the negative electrode plate 1; charging the three-electrode battery according to the current of 0.33C, discharging the current of 0.5C for 3 times at intervals of 1 hour, then performing a charging test on the three-electrode battery with the multiplying power of 0.5C, and monitoring the potentials of a plurality of reference electrodes in the charging test process; the potentials at each position when the voltage was charged to 3.65 volts are shown in Table 1.
Table 1 reference electrode potential data sheet
S102, calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate 1 of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good. The specific process is as follows:
the calculation formula of the variation coefficient is COV=sigma/Vi, wherein COV is the variation coefficient, vi is the average value of all the test potentials, sigma is the standard deviation of all the test potentials, and the larger the variation coefficient is, the larger the difference of the electrode performance of the electrode plates of different tested positions is indicated. In this example, the standard deviation and the coefficient of variation were calculated from the data in table 1, the standard deviation was 0.000765, and the coefficient of variation was 0.0076. In this embodiment, the preset threshold value 0.0090,0.0076 is smaller than the preset threshold value, so that it is determined that the electrical property uniformity of the battery negative electrode sheet 1 meets the requirement.
According to the technical scheme, the plurality of reference electrodes are arranged on the counter electrode, the variation coefficient is calculated according to the potential of the reference electrodes, the electrical property uniformity of the negative electrode pole piece 1 is judged according to the variation coefficient, and the difference of the potentials at different positions can be accurately reflected through the variation coefficient, so that the electrical property uniformity of the battery pole piece is accurately reflected.
Example 2
As shown in fig. 3 and 4, embodiment 2 of the present invention provides a method for testing electrical performance of a battery, which mainly tests the rate performance of a negative electrode of the battery, and mainly includes the following steps:
s201, manufacturing a three-electrode battery according to a battery production process.
S202, charging current of 0.2C, discharging current of 0.5C and charging and discharging cycle of 3 times, wherein each time interval is 1 hour. And the charge current is 0.5C, the discharge current is 0.5C, the charge and discharge test is carried out on the battery cell to monitor the potential of the negative electrode, and the change of the potential of the negative electrode is shown in figure 3. If the potential is always greater than zero, the current is increased for testing, and when the potential of the negative electrode reaches zero after the charging is not finished, the charging current multiplying power is reduced for testing. As can be seen from fig. 3, the negative electrode potential is always greater than zero, and the charging rate is increased for testing.
And the charge current is 2.5C, the discharge current is 0.5C, and the battery cell is subjected to charge and discharge test to monitor the potential of the negative electrode, wherein the change of the potential of the negative electrode is shown in figure 4. As can be seen from fig. 4, the negative electrode potential has reached zero at the SOC (state of charge) of 80%, and therefore the charging rate needs to be reduced for further testing. And continuously adjusting and testing by the method until the potential of the negative electrode drops to zero after the charging is finished, namely the charging multiplying power at the moment is the maximum multiplying power of the negative electrode. In this embodiment, the test conditions may be different temperatures, different anode materials, and different parameters during the process. The testing is carried out under different testing conditions, so that main factors influencing the multiplying power performance of the battery are effectively tested, and the design is optimized.
Example 3
Embodiment 3 of the present invention further provides a system for testing electrical performance of a battery, including:
the uniformity judging module is used for respectively arranging reference electrodes at a plurality of positions of a negative electrode plate of the three-electrode battery; performing charging test on the three-electrode battery with a first preset multiplying power, and monitoring the potential of a plurality of reference electrodes in the charging test process; calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good;
and the multiplying power performance testing module is used for charging and discharging the three-electrode battery by using different multiplying power currents, monitoring the potential of the negative electrode by using the reference electrode, and when the potential of the negative electrode drops to zero after charging, the corresponding charging multiplying power is the maximum multiplying power of the negative electrode.
Specifically, the calculation formula of the variation coefficient is cov=σ/Vi, wherein COV is the variation coefficient, vi is the average value of all the test potentials, σ is the standard deviation of all the test potentials, and the larger the variation coefficient is, the larger the difference of the electrode performance of the electrode plates at different tested positions is indicated.
Specifically, the three-electrode battery is a lamination or square.
Specifically, a plurality of reference electrodes are transversely and/or longitudinally arranged on the negative electrode plate 1 of the three-electrode battery.
More specifically, a plurality of reference electrodes are transversely and/or longitudinally arranged on the negative electrode plate 1 of the three-electrode battery according to a matrix arrangement mode.
Specifically, before the uniformity judging module performs a charging test on the three-electrode battery, the three-electrode battery is charged according to a first preset current, a second preset current is discharged for a preset number of times, and preset time is spaced each time.
More specifically, the value range of the first preset current is 0.30-0.36 ℃, the value range of the second preset current is 0.4-0.6 ℃, the preset times are at least 3 times, and the range of the preset time is 1-2 hours.
Specifically, the range of the first preset multiplying power is 0.3-3C.
More specifically, the value of the first preset multiplying factor is 0.33C, 0.5C, 1C, 1.5C, 2C or 2.5C.
Specifically, before the three-electrode battery is charged and discharged by using the current with different multiplying power in the multiplying power performance testing module, the multiplying power performance testing module comprises:
and charging and discharging the battery for a plurality of times by adopting a third preset current, wherein each cycle is at preset time intervals.
Specifically, the rate performance test module is further configured to:
and (3) starting to perform charge and discharge test on the three-electrode battery from the current of the second preset multiplying power, monitoring the potential of the negative electrode, if the potential is always greater than zero, increasing the current to perform test, and when the potential of the negative electrode reaches zero when charging is not finished, reducing the multiplying power of the charging current to the third preset multiplying power to perform test continuously.
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 battery electrical property testing method is characterized by comprising the following steps:
step a, testing the uniformity of the electrical property of the battery;
respectively arranging reference electrodes at a plurality of positions of a negative electrode plate of the three-electrode battery; performing charging test on the three-electrode battery with a first preset multiplying power, and monitoring the potential of a plurality of reference electrodes in the charging test process; calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good;
step b, testing the multiplying power performance of the battery;
and charging and discharging the three-electrode battery by using currents with different multiplying powers, monitoring the potential of the negative electrode by using a reference electrode, and when the potential of the negative electrode drops to zero after charging, setting the corresponding charging multiplying power as the maximum multiplying power of the negative electrode.
2. The method for testing electrical properties of a battery according to claim 1, wherein the calculation formula of the variation coefficient is cov=σ/Vi, wherein COV is the variation coefficient, vi is the average value of all the test potentials, σ is the standard deviation of all the test potentials, and the larger the variation coefficient is, the larger the difference of the electrical properties of the electrode plates at different tested positions is indicated.
3. The method of claim 1, wherein the three-electrode cell is a laminate or square.
4. The method for testing electrical properties of a battery according to claim 1, wherein a plurality of reference electrodes are transversely and/or longitudinally arranged on a negative electrode plate of the three-electrode battery.
5. The method according to claim 1, wherein before the step a of performing the charge test on the three-electrode battery, the three-electrode battery is charged according to a first preset current, and a second preset current is discharged for a preset number of times, each time with a preset interval.
6. The method according to claim 5, wherein the first preset current has a value ranging from 0.30C to 0.36C, the second preset current has a value ranging from 0.4C to 0.6C, the preset number of times is at least 3, and the preset time ranges from 1 hour to 2 hours.
7. The method of claim 1, wherein the first predetermined rate is in the range of 0.3C to 3C.
8. The method according to claim 1, wherein before the step b of charging and discharging the three-electrode battery with the current of different multiplying power, the method comprises:
and charging and discharging the battery for a plurality of times by adopting a third preset current, wherein each cycle is at preset time intervals.
9. The method for testing electrical properties of a battery according to claim 1, wherein the step b comprises:
and (3) starting to perform charge and discharge test on the three-electrode battery from the current of the second preset multiplying power, monitoring the potential of the negative electrode, if the potential is always greater than zero, increasing the current to perform test, and when the potential of the negative electrode reaches zero when charging is not finished, reducing the multiplying power of the charging current to the third preset multiplying power to perform test continuously.
10. A battery electrical performance testing system, comprising:
the uniformity judging module is used for respectively arranging reference electrodes at a plurality of positions of a negative electrode plate of the three-electrode battery; performing charging test on the three-electrode battery with a first preset multiplying power, and monitoring the potential of a plurality of reference electrodes in the charging test process; calculating a variation coefficient of the battery according to the measured potential, and judging that the electrical property uniformity of the negative electrode plate of the three-electrode battery is poor when the variation coefficient is larger than a preset threshold value, otherwise, the electrical property uniformity is good;
and the multiplying power performance testing module is used for charging and discharging the three-electrode battery by using different multiplying power currents, monitoring the potential of the negative electrode by using the reference electrode, and when the potential of the negative electrode drops to zero after charging, the corresponding charging multiplying power is the maximum multiplying power of the negative electrode.
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Cited By (1)
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| CN118091436A (en) * | 2024-04-26 | 2024-05-28 | 山东电工时代能源科技有限公司 | Test method and test system of all-vanadium redox flow battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118091436A (en) * | 2024-04-26 | 2024-05-28 | 山东电工时代能源科技有限公司 | Test method and test system of all-vanadium redox flow battery |
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