CN114035069A - Lithium battery full SOC compression modulus evaluation method - Google Patents
Lithium battery full SOC compression modulus evaluation method Download PDFInfo
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- CN114035069A CN114035069A CN202111292373.7A CN202111292373A CN114035069A CN 114035069 A CN114035069 A CN 114035069A CN 202111292373 A CN202111292373 A CN 202111292373A CN 114035069 A CN114035069 A CN 114035069A
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- compression modulus
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- 230000006835 compression Effects 0.000 title claims abstract description 27
- 238000007906 compression Methods 0.000 title claims abstract description 27
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 17
- 238000011156 evaluation Methods 0.000 title claims abstract description 7
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a lithium battery full SOC compression modulus evaluation method, which comprises the following steps: step 1, selecting two identical full discharge electric cores to respectively carry out constant pressure and constant gap tests; step 2, constant pressure testing: keeping the initial pressure unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording the corresponding battery cell thickness variation when the SOC of the battery cell gradually rises from 0% to 100% in real time; step 3, keeping the initial gap unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording a corresponding pressure value when the SOC of the battery cell gradually rises from 0% to 100%; and 4, obtaining the thickness variation and the pressure value of the battery cell under the corresponding SOC according to the steps 2 and 3, and drawing a strain-stress curve, wherein the slope of each point of the curve corresponds to the compression modulus of the SOC corresponding to the point. The method can obtain the compression modulus of the lithium battery in the full SOC state.
Description
Technical Field
The invention relates to the field of lithium battery performance measurement, in particular to a lithium battery full SOC compression modulus evaluation method.
Background
The expansion behavior of the lithium ion battery cell in the charging and discharging process has two expression forms: thickness and stress, accurate measurement help optimizing electric core design and promote the security performance of battery in the use.
The general method adopts a universal tester for testing, which is to measure the compression modulus of the battery cell under a fixed state (such as charging 10% and charging 20%), wherein a change curve of the compression modulus is a discrete point (namely, the SOC is the compression modulus corresponding to 10% and the SOC is the compression modulus corresponding to 20%), and the compression modulus of the battery cell under a continuous full SOC state (namely, when the SOC range is 0% to 100%, the compression modulus corresponding to the SOC can be found by arbitrarily taking an SOC value in the range) cannot be intuitively and accurately represented.
Object of the Invention
Aiming at the problems in the prior art, the invention aims to provide a method for evaluating the full SOC compression modulus of a lithium battery so as to obtain the compression modulus in a full SOC state.
In order to achieve the purpose, the invention adopts the technical scheme that:
a lithium battery full SOC compression modulus evaluation method comprises the following steps:
step 1, selecting two identical full discharge electric cores to respectively carry out constant pressure and constant gap tests;
step 2, constant pressure testing: applying an initial pressure to the cell to obtain the initial thickness of the cell under the constant pressure; then keeping the initial pressure unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording the corresponding battery cell thickness variation when the SOC of the battery cell gradually rises from 0% to 100% in real time;
step 3, constant gap testing: applying an initial pressure to the battery cell, and measuring a pressing plate gap of the battery cell to be an initial gap; keeping the initial gap unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording a pressure value corresponding to the gradual increase of the SOC of the battery cell from 0% to 100%; the pressure value is the pressure applied when the initial clearance of the battery core needs to be kept unchanged;
and 4, obtaining the thickness variation and the pressure value of the battery cell under the corresponding SOC according to the steps 2 and 3, drawing a strain-stress curve by taking the two parameters as the strain and the stress of the battery cell, wherein the slope of each point of the strain-stress curve corresponds to the compression modulus of the SOC corresponding to the point, and thus, the compression modulus of the lithium battery under the full SOC state is obtained.
In the step 2, after the battery cell thickness variation is recorded, a battery cell thickness variation-SOC curve is drawn.
In the step 3, after the voltage is recorded, a pressure-SOC curve is drawn.
By adopting the scheme, the compression modulus of the lithium battery in the full SOC state can be obtained, the mechanical property of the battery cell is evaluated, the manufacturing process is guided, and the formula is improved; and evaluating the aging degree of the battery cell through the complete compression modulus of the battery cell, and better knowing the circulation state of the battery cell.
Drawings
FIG. 1 is a plot of expansion for different SOCs at constant pressure and constant gap;
fig. 2 is a schematic stress-strain curve.
Detailed Description
The invention discloses a lithium battery full SOC compression modulus evaluation method, which comprises the following steps:
step 1, selecting two identical full discharge electric cores to respectively carry out constant pressure and constant gap tests.
The constant pressure test and the constant gap test can be realized by adopting an in-situ expansion analyzer.
Step 2, constant pressure testing: applying an initial pressure (e.g., 10 kg) to the cell to obtain an initial thickness of the cell at the constant pressure; then, the initial pressure is kept unchanged, the battery cell is charged from a fully discharged state to a fully charged state, data such as the battery cell thickness variation, the current, the voltage, the capacity and the like corresponding to the gradual increase of the SOC of the battery cell from 0% to 100% are recorded in real time, and a battery cell thickness variation-SOC curve is drawn (as shown in fig. 1).
Step 3, constant gap testing: applying an initial pressure (e.g., 10 kg) to the cell, and measuring the platen gap of the cell to be an initial gap; keeping the initial gap unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording a pressure value corresponding to the gradual increase of the SOC of the battery cell from 0% to 100%; the pressure value refers to data such as pressure, current, voltage, capacity and the like applied when the initial gap of the battery cell needs to be kept unchanged, and a pressure-SOC curve is drawn (as shown in fig. 1).
In the above steps 2 and 3, the data of current, voltage capacity, etc. and the variation-SOC curve and the pressure-SOC curve can be used to determine whether the result of the test data is normal.
And 4, obtaining the thickness variation and the pressure value of the battery cell under the corresponding SOC according to the steps 2 and 3, drawing a strain-stress curve (shown in fig. 2) by taking the two parameters as the strain and the stress of the battery cell, wherein the slope of each point of the curve corresponds to the compression modulus of the SOC corresponding to the point, and thus, the compression modulus of the lithium battery under the full SOC state is obtained.
In conclusion, the method can obtain the compression modulus of the lithium battery in the full SOC state, evaluate the mechanical property of the battery core, guide the manufacturing process and improve the formula; and evaluating the aging degree of the battery cell through the complete compression modulus of the battery cell, and better knowing the circulation state of the battery cell.
The above description is only exemplary of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above exemplary embodiments according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (3)
1. A lithium battery full SOC compression modulus evaluation method is characterized in that: the method comprises the following steps:
step 1, selecting two identical full discharge electric cores to respectively carry out constant pressure and constant gap tests;
step 2, constant pressure testing: applying an initial pressure to the cell to obtain the initial thickness of the cell under the constant pressure; then keeping the initial pressure unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording the corresponding battery cell thickness variation when the SOC of the battery cell gradually rises from 0% to 100% in real time;
step 3, constant gap testing: applying an initial pressure to the battery cell, and measuring a pressing plate gap of the battery cell to be an initial gap; keeping the initial gap unchanged, charging the battery cell from a fully discharged state to a fully charged state, and recording a pressure value corresponding to the gradual increase of the SOC of the battery cell from 0% to 100%; the pressure value is the pressure applied when the initial clearance of the battery core needs to be kept unchanged;
and 4, obtaining the thickness variation and the pressure value of the battery cell under the corresponding SOC according to the steps 2 and 3, drawing a strain-stress curve by taking the two parameters as the strain and the stress of the battery cell, wherein the slope of each point of the strain-stress curve corresponds to the compression modulus of the SOC corresponding to the point, and thus, the compression modulus of the lithium battery under the full SOC state is obtained.
2. The method for evaluating the full SOC compressive modulus of a lithium battery according to claim 1, wherein: in the step 2, after the battery cell thickness variation is recorded, a battery cell thickness variation-SOC curve is drawn.
3. The method for evaluating the full SOC compressive modulus of a lithium battery according to claim 1, wherein: in the step 3, after the voltage is recorded, a pressure-SOC curve is drawn.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119714183A (en) * | 2023-09-28 | 2025-03-28 | 宁德时代新能源科技股份有限公司 | Method, device and medium for determining stress-strain relation of battery cell |
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| CN111129386A (en) * | 2019-12-27 | 2020-05-08 | 苏州清陶新能源科技有限公司 | Foam type selection method for battery module and battery module |
| CN113504475A (en) * | 2021-04-29 | 2021-10-15 | 浙江南都电源动力股份有限公司 | Device and method for evaluating expansion behavior of lithium battery |
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2021
- 2021-11-03 CN CN202111292373.7A patent/CN114035069A/en active Pending
Patent Citations (6)
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| KR20130087042A (en) * | 2010-11-17 | 2013-08-05 | 미쓰이금속광업주식회사 | Copper foil for lithium ion secondary battery negative electrode collector, lithium ion secondary battery negative electrode material, and method for selecting lithium ion secondary battery negative electrode collector |
| CN107683301A (en) * | 2015-06-19 | 2018-02-09 | 宇部兴产株式会社 | Polyolefin microporous film, separator film for electrical storage device, and electrical storage device |
| CN105466777A (en) * | 2015-12-14 | 2016-04-06 | 成都慧成科技有限责任公司 | Method for detecting pressure resistant performance of microporous film |
| CN110783635A (en) * | 2018-07-30 | 2020-02-11 | 丰田自动车株式会社 | All-solid-state battery and method of making the same |
| CN111129386A (en) * | 2019-12-27 | 2020-05-08 | 苏州清陶新能源科技有限公司 | Foam type selection method for battery module and battery module |
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