A kind of lithium-ion battery aging capacity classification method

A lithium-ion battery, battery technology, applied in secondary batteries, electrochemical generators, secondary battery repair/maintenance, etc., can solve the problems of wasteful capacity dividing equipment production efficiency, poor stability, etc.

Active Publication Date: 2022-03-08
江西安驰新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the capacity stability of lithium batteries is poor for the first three to five times of 1C capacity division. It takes multiple times of capacity division to test the real capacity of the battery, which seriously wastes the production efficiency of capacity division equipment.

Method used

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  • A kind of lithium-ion battery aging capacity classification method
  • A kind of lithium-ion battery aging capacity classification method
  • A kind of lithium-ion battery aging capacity classification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The lithium-ion battery aging capacity classification method comprises the following steps:

[0030] S1. Aging at 40°C for 18h after battery injection and sealing;

[0031] S2, constant current and constant voltage 1C charge to 3.65V cut-off current 0.2C, then aging at 45°C for 18h;

[0032] S3, constant current 1C discharge for 10min;

[0033] S4, constant current constant voltage 1C charging to 3.65V cut-off current 0.2C;

[0034] S5, constant current 1C discharge to 1.85V;

[0035] S6, constant current constant voltage 1C charging to 3.65V cut-off current 0.2C;

[0036] S7, constant current 1C discharge to 2.5V;

[0037] S8, constant current 0.3C discharge to 2V, constant current 0.02C discharge to 2V;

[0038] S9, constant current 0.2C charging for 30min. That is, a lithium-ion battery with capacity separation is obtained.

Embodiment 2

[0040] The lithium-ion battery aging capacity classification method comprises the following steps:

[0041] S1. Aging at 50°C for 18 hours after battery injection and sealing;

[0042] S2, constant current and constant voltage 1C charge to 3.65V cut-off current 0.2C, then aging at 50°C for 18h;

[0043] S3, constant current 1C discharge for 10min;

[0044] S4, constant current constant voltage 1C charging to 3.65V cut-off current 0.2C;

[0045] S5, constant current 1C discharge to 1.9V;

[0046] S6, constant current constant voltage 1C charging to 3.65V cut-off current 0.2C;

[0047] S7, constant current 1C discharge to 2.5V;

[0048] S8, constant current 0.3C discharge to 2V, constant current 0.02C discharge to 2V;

[0049] S9. Charging at a constant current of 0.2C for 30 minutes; that is, a lithium-ion battery with capacity division is obtained.

Embodiment 3

[0051] The lithium-ion battery aging capacity classification method comprises the following steps:

[0052] S1. Aging at 50°C for 18 hours after battery injection and sealing;

[0053] S2, constant current and constant voltage 1C charge to 3.65V cut-off current 0.2C, then aging at 50°C for 18h;

[0054] S3, constant current 1C discharge for 5min;

[0055] S4, constant current constant voltage 1C charging to 3.65V cut-off current 0.2C;

[0056] S5, constant current 1C discharge to 2.5V;

[0057] S6, constant current constant voltage 1C charging to 3.65V cut-off current 0.2C;

[0058] S7, constant current 1C discharge to 2.5V;

[0059] S8, constant current 0.3C discharge to 2V, constant current 0.02C discharge to 2V;

[0060] S9, constant current 0.2C charging for 30min. That is, a lithium-ion battery with capacity separation is obtained.

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Abstract

The invention discloses a lithium-ion battery aging capacity classification method, which comprises the following steps: high-temperature aging of the aging battery for 18h-24h after liquid injection and sealing; 18h-24h high-temperature aging after 1C power supply to 3.65V; constant current 1C discharge for 5min-24h 10min; constant current and constant voltage 1C charge to 3.65V cut-off current 0.2C; constant current 1C discharge to 1.85V ~ 2V; constant current constant voltage 1C charge to 3.65V cut-off current 0.2C; constant current 1C discharge to 2V ~ 2.5V; Gradient small current discharge to 2V; constant current 0.2C charge for 30min. In the present invention, the low-voltage and high-voltage aging methods are used to ensure the compactness of the SEI film of the battery cell, and then the battery material activity is activated by shallow discharge, deep charge and deep discharge during the capacity division, and the difference between the discharge capacity of the first capacity division and the subsequent use capacity The difference is not big, and at the same time, the stability of the battery capacity in the long-term cycle is obviously better than that of the battery made by the original capacity separation process.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery aging and capacity classification method. Background technique [0002] In the prior art, the lithium-ion battery cell after formation is generally 20% to 35% SOC, but the CH in the SEI film 3 OCO 2 Li needs to be formed at a higher voltage, resulting in insufficient aging. Therefore, it is necessary to charge the battery to a fully charged state during the aging process. [0003] At present, the capacity stability of lithium batteries is poor for the first three to five times of 1C capacity division. It takes multiple times of capacity division to test the real capacity of the battery, which seriously wastes the production efficiency of capacity division equipment. [0004] Therefore, the present invention proposes a lithium-ion battery aging capacity classification method. Contents of the invention [0005] The purpose of the present in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/44H01M10/0525G01R31/385G01R31/387
CPCH01M10/446H01M10/0525G01R31/3865G01R31/387Y02E60/10
Inventor 张近钢阮江明白科黄浩游杰陈富源
Owner 江西安驰新能源科技有限公司
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