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Lithium battery attenuation model based on EIS test

An attenuation model and lithium battery technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve problems such as limiting online life estimation, and achieve the effects of increased ohmic internal resistance, short time, and high efficiency

Pending Publication Date: 2022-02-11
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the real vehicle environment, it is difficult to fully charge and discharge to obtain the capacity of the battery, thus limiting the use of capacity for online life estimation

Method used

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  • Lithium battery attenuation model based on EIS test
  • Lithium battery attenuation model based on EIS test
  • Lithium battery attenuation model based on EIS test

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Select two batches of IFP27175200 battery cells as the battery cells to be tested, numbered as batch 1, and let the above-mentioned battery cells to be tested stand for 4 weeks to ensure that the battery cells are fully charged and have no overcharge phenomenon .

[0051] S11: First, perform 1C / 1C capacity calibration on the cell to be tested at 25°C, and record the discharge capacity;

[0052] S12: Place the above cells to be tested in an incubator at 25°C for 2 hours at a constant temperature, then place the cells to be tested on a multi-channel battery EIS impedance tester for EIS testing, the frequency range of EIS testing is 0.01-10Hz, and collect EIS data;

[0053] S13: After the EIS test, perform the 1C / 1C charge-discharge cycle test on the above-mentioned cells to be tested at 25°C;

[0054] S14: When the cycle capacity of the battery cell decays by 5%, place the cell at the end of the cycle in S13 in a 25°C incubator for 2 hours, then place it on t...

Embodiment 2

[0058] Select two batches of IFP27175200 type cells as the cells to be tested, numbered as batch 2. Let the above-mentioned batteries to be tested stand for 4 weeks to ensure that the batteries are fully charged and there is no overcharging.

[0059] S21: First, calibrate the 1C / 1C capacity of the cell under test at 45°C, and record the discharge capacity;

[0060] S22: Place the above-mentioned cells to be tested in a constant temperature box at 45°C for 2 hours, and then place the cells to be tested on a multi-channel battery EIS impedance tester for EIS testing. The frequency range of the EIS test is 0.01-10Hz. Collect EIS data;

[0061]S23: After the EIS test, perform a 1C / 1C charge-discharge cycle test on the above-mentioned cells to be tested at 45°C;

[0062] S24: When the cycle capacity of the cell decays by 5%, place the cell at the end of the cycle in 13 in a 45°C incubator for 2 hours, then place it on the fixture for EIS testing, and collect EIS data. When the ce...

Embodiment 3

[0066] Select two batches of IFP27175200 type cells as the cells to be tested, numbered as batch 3. Let the above-mentioned batteries to be tested stand for 4 weeks to ensure that the batteries are fully charged and there is no overcharging.

[0067] S31: First, calibrate the 1C / 1C capacity of the cell under test at 55°C, and record the discharge capacity;

[0068] S32: Place the above-mentioned cells to be tested in a constant temperature box at 55°C for 2 hours at a constant temperature, then place the cells to be tested on a multi-channel battery EIS impedance tester for EIS testing, the frequency range of EIS testing is 0.01-10Hz, and collect EIS data;

[0069] S33: After the EIS test, perform a 1C / 1C charge-discharge cycle test on the above-mentioned cells to be tested at 55°C;

[0070] S34: When the cycle capacity of the cell decays by 5%, place the cycle-end cell in S3 in a 55°C incubator for 2 hours, then place it on the fixture for EIS testing, and collect EIS data....

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Abstract

The invention discloses a lithium battery attenuation model based on an EIS test. The lithium battery attenuation model comprises the following steps of S1, carrying out capacity calibration on a to-be-tested battery cell; S2, placing the calibrated to-be-tested battery cell on a multi-channel battery EIS impedance tester for EIS test, and collecting EIS data; S3, performing charge-discharge cycle testing on the to-be-tested battery cell at different set environment temperatures; S4, when the cycle capacity of the to-be-tested battery cell in the step S3 is attenuated by a set value A every time, after standing for a set time, entering the step S2 to carry out an EIS test, and collecting EIS data; S5, the steps S3 to S4 being cycled till the cycle capacity of the to-be-tested battery cell is attenuated to a set value B, and the cycle test and the EIS test being ended; S6, comparing the circulation curve of the to-be-measured battery cell at different set temperatures with the EIS curve before and after circulation to obtain a linear relation between the ohmic impedance and the capacity attenuation rate at different set temperatures, and constructing an attenuation model. The lithium battery attenuation model estimates the attenuation degree of the battery by using the internal resistance, and qualitative prediction accuracy of the service life of the lithium battery is high.

Description

technical field [0001] The invention relates to the field of lithium battery preparation technology, in particular to a lithium battery decay model based on EIS testing. Background technique [0002] At present, the maturity of electric vehicle technology is increasing day by day. For electric vehicles, the problem of vehicle battery attenuation has attracted much attention. Accurately predicting battery state of health and remaining useful life is critical. [0003] At present, the common method of battery attenuation estimation is mainly to calculate the current life of the battery by obtaining the decreasing law of the capacity parameters and life of the battery. In the real vehicle environment, it is difficult to fully charge and discharge to obtain the capacity of the battery, thus limiting the use of capacity for online life estimation. Contents of the invention [0004] Based on the technical problems existing in the background technology, the present invention pr...

Claims

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Application Information

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IPC IPC(8): G01R31/392G01R31/389
CPCG01R31/392G01R31/389
Inventor 张婷婷杨思文厉运杰
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY