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Aging and capacity grading method for lithium ion battery
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A lithium-ion battery and battery technology, applied in the field of lithium-ion battery technology, can solve the problems of wasteful capacity dividing equipment, poor production efficiency, poor stability, etc.
Active Publication Date: 2021-05-18
江西安驰新能源科技有限公司
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[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.
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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;
[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 an aging and capacity grading method for a lithiumion battery. The method comprises the following steps: performing high-temperature aging on a to-be-aged battery for 18-24 hours after liquid injection and sealing; performing charging at 1C to 3.65 V, and performing aging at high temperature for 18-24 hours; performing discharging at constant current of 1C for 5-10 minutes; performing charging to 3.65 V at a constant current and a constant voltage of 1C and a cut-off current of 0.2 C; performing discharging to 1.85 V to 2V at a constant current of 1C; performing charging to 3.65 V at a constant current and a constant voltage of 1C and a cut-off current of 0.2 C; performing discharging at a constant current of 1C to 2V-2.5 V; discharging the gradient small current to 2V; and performing charging for 30 minutes at a constant current of 0.2 C. According to the method, the compactness of an SEI film of a battery cell is ensured by adopting a low-voltage aging mode and a high-voltage aging mode, and then the activity of a battery material is activated by adopting a shallow discharging, deep charging and deep discharging mode during capacity grading, so that the difference between the first capacity grading discharging capacity and the subsequent use capacity is small; meanwhile, the battery capacity stability is obviously superior to that of a battery prepared by an original capacity grading process in the aspect of long-term circulation.
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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