Lithium ion battery low-voltage selection method

A lithium-ion battery and battery technology, which is applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of low-voltage battery leakage and misjudgment of lithium-ion batteries, and achieves low leakage and misjudgment rate, strict standards, and reduced leakage. The effects of judgment and misjudgment

Pending Publication Date: 2021-09-10
DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a low-voltage selection method for lithium-ion batteries that can solve the problem of low-voltage battery leakage and misjudgment in the low-voltage selection method.

Method used

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  • Lithium ion battery low-voltage selection method
  • Lithium ion battery low-voltage selection method
  • Lithium ion battery low-voltage selection method

Examples

Experimental program
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Embodiment

[0032] like Figure 1-7 As shown, a lithium-ion battery low-voltage selection method includes a low-voltage selection process and a low-voltage selection standard, and the low-voltage selection process includes the following steps:

[0033] Step 1): Select A, B, and C batches of batteries according to time (batch / 24H);

[0034] Step 2): Charge the battery to full charge at a constant current and constant voltage of 0.5C, cut off the current at 0.03C, discharge to empty at a constant current of 0.5C, cycle the above process twice, and the second time is 0.5C Current constant current constant voltage charge to half charge 3750mV, cut-off current 0.03C;

[0035] Step 3): Put the battery charged in the above steps at room temperature for 2 days;

[0036] Step 4): Test the open circuit voltage OCV1 of the battery after the above steps are put on hold;

[0037] Step 5): Continue to store the battery after measuring OCV1 at room temperature for 7 days;

[0038] Step 6): Test the ...

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Abstract

The invention relates to a lithium ion battery low-voltage selection method. The method comprises the following steps: selecting different batches (A, B, C... N) of batteries; carrying out capacity grading charging on the batteries to cut-off voltage; placing the batteries at normal temperature or high temperature for 2-4 days; testing the open-circuit voltage OCV1 of the shelved batteries; continuously placing the batteries at normal temperature or high temperature for 6-10 days; testing the open-circuit voltage OCV2 of the shelved batteries; calculating the self-discharge rate K = (OCV1-OCV2) / T of the batteries, sorting OCV1 data and OCV2 data of (A, B, C... N) batches of batteries in an ascending order, determining curve inflection point positions V1 and V2, and judging the batteries with OCV1 smaller than V1 or OCV2 smaller than V2 to be low voltage; and determining the corresponding overall self-discharge rates of the A, B, C... N batches of batteries, and taking the overall self-discharge rate Kn of the previous batch of batteries as the self-discharge rate standard of the next batch of batteries until the batch ends; the method has the advantages of being strict in standard, high in accuracy and low in missed judgment rate.

Description

technical field [0001] The invention belongs to the technical field of manufacturing soft-pack lithium-ion batteries, and in particular relates to a low-voltage selection method for lithium-ion batteries. Background technique [0002] Today, with the rapid development of science and technology, lithium-ion batteries are widely used in mobile phones, notebook computers, digital cameras, electric vehicles, electric tools and new energy vehicles, and lithium-ion batteries have also rapidly developed into an important industry in the field of secondary batteries. An industry; lithium batteries far surpass other secondary batteries in terms of specific capacity, no memory effect, long life, and environmental protection. Control of moisture and impurities during processing, micro-short-circuit selection methods, etc.; low-voltage selection of lithium-ion batteries refers to testing the self-discharge rate of the processed lithium-ion battery, and judging whether there is a micro-s...

Claims

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Application Information

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IPC IPC(8): G01R31/378G01R31/385G01R31/367
CPCG01R31/378G01R31/3865G01R31/367Y02E60/10
Inventor 张向举赵跃林李伟杰王丹丹王震李晓美杨豪亮
Owner DO FLUORIDE NEW ENERGY TECHNOLOGY CO LTD
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