Secondary battery

By setting an auxiliary weld print area at the edge of the main weld print area of ​​the tab, multiple small-area second weld prints are formed, which solves the problem of cracking of the tab during welding, enhances the strength of the edge of the weld print area, and improves the stability and reliability of welding.

WO2025194774A1 Publication Date: 2025-09-25SUNWODA MOBILITY ENERGY TECHNOLOGY CO LTD
9 Cites 0 Cited by

Patent Information

Application Number
PCT/CN2024/127742
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-22
Filing Date
2024-10-28
Publication Date
2025-09-25

AI Technical Summary

Technical Problem

During the ultrasonic welding of the tabs, the edges of the weld marks are prone to cracking, and the tabs may slide and tear due to vibration.

Method used

The main weld print area and auxiliary weld print area of ​​the tab are designed, a large-area first weld print is formed in the main weld print area, and a small-area second weld print is formed in the auxiliary weld print area. By setting the auxiliary weld print area at the edge of the main weld print area, the tabs are partially or completely welded together to form multiple second welding structures, thereby enhancing the strength of the edge of the weld print area.

Benefits of technology

The deformation of the tab during welding is reduced, the risk of tab cracking is reduced, the strength of the edge of the weld mark area is improved, and the stability and reliability of welding are ensured.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

Disclosed in the present application is a secondary battery, comprising a cover plate, a battery cell, and a connecting piece; the connecting piece is connected to a pole column on the cover plate and a tab of the battery cell; the tab comprises a plurality of tab pieces, and a first face of the tab opposite to the connecting piece has a main welding area and an auxiliary welding area located at the edge of the main welding area; the tab is welded to the connecting piece so as to form a plurality of first welding marks on the main welding area, some of the tab pieces or all of the tab pieces are welded to form a plurality of second welding marks on the auxiliary welding area, and the area of the first welding marks is greater than the area of the second welding marks. In the present application, the tab pieces at the edge of the whole welding area are integrated, reducing deformation of the edge of the whole welding area during ultrasonic welding, increasing the strength of the tab pieces at the edge, and reducing the risk of the tab pieces cracking.
Need to check novelty before this filing date? Find Prior Art