Cover plate structure and battery

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By designing the cylindrical connection edges and the mounting steps in the cover plate structure, the problem of low welding yield between the steel shell and the steel cover plate is solved, and higher welding reliability and yield are achieved.

WO2025066179A1 Publication Date: 2025-04-03SVOLT ENERGY TECHNOLOGY CO LTD

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Patent Information

Application Number: PCT/CN2024/093497
Authority / Receiving Office: WO · WO
Patent Type: Applications
Current Assignee / Owner
Priority Date: 2023-09-28
Filing Date: 2024-05-15
Publication Date: 2025-04-03

Application Information

Patent Timeline

28 Sep 2023

Priority

15 May 2024

Application

PCT/CN2024/093497

03 Apr 2025

Publication

WO2025066179A1

IPC: H01M50/147; H01M50/169

CPC: Y02E60/10; H01M50/169; H01M50/147; H01M50/15; H01M50/103; H01M50/159; H01M50/119; H01M50/276

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Application Domain

Cell lids/covers

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AI Technical Summary

Technical Problem

The welding yield of existing steel shells and steel cover plates is low and the welding effect is poor, resulting in thermal runaway and rupture of the battery cell.

Method used

A cover plate structure is designed, including the cover plate main body and the connecting edge. The connecting edge is cylindrical, and a snapping step is set on the outside, and the side wall of the shell is embedded in the snapping step to increase the connection area and improve welding reliability.

Benefits of technology

By increasing the area between the steel cover plate and the steel shell, the reliability of welding is improved, the concave phenomenon during welding is avoided, and the welding yield is improved.

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Abstract

The present application relates to the field of battery structures, and in particular to a cover plate structure and a battery. The cover plate structure is used for connecting to a casing of a battery. The cover plate structure comprises a cover plate main body and a connection edge, a circle of the connection edge being arranged on the circumferential edge of the cover plate main body, and an L-shaped connection structure being formed between the edge of the cover plate main body and the connection edge. A fitting step is provided on the outer side of the end of the connection edge away from the cover plate main body, the side wall of the casing surrounding the connection edge in the circumferential direction and fitting into the fitting step. The cover plate structure provided by the present application can increase the area of connecting the inner side wall of the steel casing and the fitting step, so as to further improve the connection reliability of the steel cover plate and the steel casing, thereby improving the yield of welding the steel casing and the steel cover plate and preventing welds from being recessed inwards during tool press fitting in welding.

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