Method for detecting liquid absorption state of lithium ion battery pole group

By setting the temperature and vacuum degree, calculating the liquid suction speed, observing the liquid suction lines and electrolyte residue, disassembly the battery at intervals to judge the liquid suction status, adjusting the air pressure value and liquid injection holding time, the problem of low efficiency of the existing lithium-ion battery pole group liquid suction performance detection method is solved, and the optimal liquid suction effect and performance improvement of the battery is achieved.

CN119716614APending Publication Date: 2025-03-28FIRST NEW ENERGY GRP CO LTD
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Patent Information

Application Number
CN202510021880.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-07
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

The existing lithium-ion battery pole group liquid absorption performance detection methods have a long detection time and low efficiency, which affects battery performance and development progress.

Method used

By placing the lithium-ion battery in a container filled with electrolyte, setting the temperature and vacuum degree, calculating the liquid absorption speed, observing the liquid absorption lines and the residual amount of electrolyte, disassembly the battery at intervals to judge the liquid absorption state, adjusting the air pressure value and liquid injection holding time to achieve the best liquid absorption effect.

Benefits of technology

It realizes a simple, timely and effective judgment of the liquid-absorbing interface of the electrode sheet, ensuring that the electrolyte is completely immersed in the electrode sheet, improving the safety performance, electrical performance and cycle life of the battery, and avoiding storage testing problems caused by excessive or too little electrolyte.

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Abstract

The invention discloses a lithium ion battery pole group liquid absorption state detection method, which belongs to the technical field of lithium ion batteries, and specifically comprises the following steps: 1) putting a lithium ion battery into a container filled with electrolyte, and setting the temperature and vacuum degree of the electrolyte; (2) taking out the liquid-injected lithium ion battery, and analyzing the liquid absorption speed of the liquid-injected lithium ion battery; (3) disassembling the lithium ion battery which well absorbs the liquid, observing the liquid absorption lines on the positive and negative pole pieces, and observing whether the positive and negative pole pieces have long strip-shaped lines which obviously become white and are larger in area or not at the same time; (4) respectively disassembling the batteries again every 24 hours, 48 hours and 72 hours, disassembling 3 pcs each time, and observing by the same method; 5, the air pressure value and the liquid injection holding time are adjusted in time according to the result, so that the liquid absorption state of the pole piece reaches the optim.The method solves the problems that due to the fact that the electrolyte is excessive, the storage test gas production rate is large, CID overturning is not passed, or due to the fact that the electrolyte is too little, circulation diving is caused, and meanwhile unnecessary resource waste is avoided.
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