Battery cells and devices, electric devices, energy storage devices and systems, charging networks

By using graphite with high BET specific surface area and graphite materials with specific interlayer spacing in battery cells, combined with large cross-sectional area electrode terminals and multi-level stepped sealing structure, the sealing failure problem during thermal runaway of battery cells is solved, thereby improving the structural reliability and service life of battery cells.

CN120565948BActive Publication Date: 2025-11-25CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202511056287.4
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-07-30
Publication Date
2025-11-25
Estimated Expiration
2045-07-30

AI Technical Summary

Technical Problem

When a battery cell experiences thermal runaway, the internal pressure increases rapidly, leading to seal failure and affecting the sealing performance of the battery casing structure.

Method used

The graphite has a BET specific surface area greater than 2.25 m²/g and an interlayer spacing variation rate of 8.3%≤M≤9.1%. Combined with the fact that the cross-sectional area of ​​the first connection part of the electrode terminal is larger than that of the mounting hole, and with the addition of a sealing ring and a multi-stage stepped structure, the sealing reliability is enhanced.

Benefits of technology

It effectively reduces the risk of structural and sealing failures in battery cells, improves the structural reliability and overall performance of battery cells, and extends their service life.

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Abstract

The application provides a battery monomer and device, an electric device, an energy storage device and system, and a charging network, and belongs to the battery field. The battery monomer comprises a shell, an electrode assembly, and a end cover assembly; the shell comprises a containing cavity with an opening, the electrode assembly is arranged in the containing cavity, and the electrode assembly comprises a negative plate containing graphite; the end cover assembly comprises a cover plate and an electrode terminal, the cover plate covers the opening, and the cover plate is provided with a mounting hole; the electrode terminal comprises a first connecting part and a second connecting part, the first connecting part is located on the side of the cover plate facing the electrode assembly and is electrically connected with the electrode assembly, the second connecting part is arranged through the mounting hole and protrudes from the surface of the cover plate, the cross-sectional area of the first connecting part is larger than the area of the mounting hole, the BET specific surface area of the graphite is greater than 2.25 m² / g, and the change rate M of the interlayer spacing of the graphite before and after charging of the battery monomer satisfies 8.3%≤M≤9.1%. The battery monomer provided by the application can improve the reliability of sealing and structure and improve the comprehensive performance of the battery monomer.
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