High-power battery pole group

Through the multi-layer coating design of the electrode sheet and the diaphragm, the electro-hydraulic transmission and electrode sheet liquid absorption paths are optimized, and the problems of poor electro-hydraulic infiltration and lithium-ion failure during the charging and discharge of the large-scale battery cells are solved, which significantly extends the life of the battery cells.

CN119965370APending Publication Date: 2025-05-09中汽新能(天津)电池科技有限公司
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Patent Information

Application Number
CN202510035047.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-01-09
Publication Date
2025-05-09

AI Technical Summary

Technical Problem

During the charging and discharging process, existing large-scale battery cells are prone to poor electro-hydraulic infiltration, failure of circulating lithium and increased polarization, resulting in rapid attenuation of life.

Method used

Through different coating designs of the electrode sheet and the diaphragm, multi-dimensional liquid absorption and electro-hydraulic transmission of the upper and lower layers of the electrode sheet are realized, the liquid absorption path of the electrode sheet is optimized, and the blockage of the liquid absorption channel caused by the bending of the diaphragm is avoided through the segmented design of the diaphragm.

Benefits of technology

It ensures the life of high-power battery cells in all aspects, solves the problems of structural lithium-ion and liquid-absorbing lithium-ion, and extends the service life of the battery cells.

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Abstract

The invention discloses a high-power battery pole group which is characterized in that a middle-section coating of a positive plate is made of a lithium-intercalated and de-intercalated high-rate discharge active material, an upper-section coating and a lower-section coating are made of materials with insulation and liquid absorption capabilities, and the liquid absorption capability of the lower-section coating is greater than that of the upper-section coating; the negative plate upper-section coating is an active material for bearing rapid embedding of lithium ions, and the negative plate lower-section coating is a porous liquid absorption layer formed by an active material which contains a large-particle-size main body material and has rapid liquid absorption capability; the diaphragm upper-section coating and the diaphragm lower-section coating are made of a ceramic material which has liquid absorbing and retaining capabilities and can expand after absorbing liquid to fill a gap between a positive electrode and a negative electrode at the top end, the diaphragm middle-section coating does not have the liquid absorbing capability, and the porosity of a base membrane on which the diaphragm lower-section coating is positioned is greater than that of the base membrane of the middle-section coating and the upper-section coating. According to the invention, the problems of structural lithium precipitation and imbibition lithium precipitation are solved, and the service life of the high-power battery cell is guaranteed in all directions.
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