Secondary batteries, electrode impregnation methods, and preparation methods of secondary batteries

By adjusting the electrode design and optimizing the electrolyte formulation, the electrolyte wettability problem of high-energy-density, large-size soft-pack lithium-ion batteries was solved, improving the battery's long-term cycle and high-temperature storage performance while maintaining production efficiency.

CN117525275BActive Publication Date: 2026-05-26CHONGQING TALENT NEW ENERGY CO LTD
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Patent Information

Application Number
CN202311592550.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-11-27
Publication Date
2026-05-26
Estimated Expiration
2043-11-27

AI Technical Summary

Technical Problem

Existing methods are insufficient to effectively improve the electrolyte wettability of high-energy-density, large-size pouch lithium-ion batteries, especially when the aspect ratio is small, which leads to a decrease in battery performance.

Method used

By establishing the correlation between electrode surface density, compaction density, number of stacked layers and electrode pore volume, the electrode surface density and compaction density can be reduced, the number of stacked layers can be increased, the electrolyte formulation can be optimized, the appropriate electrolyte injection volume can be determined, and electrolyte permeation channels and storage space can be provided.

Benefits of technology

It improves the wettability of the electrolyte, enhances the battery's long-term cycle and high-temperature storage performance, while maintaining production efficiency and manufacturing feasibility.

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Abstract

This invention relates to a secondary battery, an electrode wetting method, and a method for preparing the secondary battery. From a product design perspective, this invention reduces the areal density and compaction density of the electrode, increases the number of stacked layers, establishes a correlation between electrode areal density, compaction, and the number of stacked layers and the electrode pore volume, and directionally increases electrode pores to provide channels and storage space for electrolyte penetration. Based on this, the electrolyte formulation is optimized, thereby improving electrolyte wettability and ultimately enhancing the battery's long-term cycle life and high-temperature storage performance.
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