Battery cell and manufacturing method therefor, battery apparatus, and electrical apparatus

By limiting the tensile strength of the first end wall in the battery cell and designing the welding, the problem of insulation damage caused by protrusion at the welding point is solved, thereby improving the reliability and product quality of the battery device.

WO2026144273A1PCT designated stage Publication Date: 2026-07-09CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2025-09-15
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

How to improve the reliability of battery devices, especially to reduce the impact of external impacts on the internal structure of battery cells, and to prevent protrusions at welded parts from puncturing the insulation.

Method used

By limiting the room temperature tensile strength of the first end wall to the range of 250MPa to 2000MPa, setting the outer surface of the weld to an arc surface, ensuring that the weld does not protrude or protrudes slightly from the first surface and the side wall surface, and having an appropriate difference in thickness between the side wall and the first end wall, laser welding is used to ensure flatness and connection stability.

Benefits of technology

It improves the reliability and assembly consistency of individual battery cells, reduces the risk of damage to external structural components, and enhances the product quality and volumetric energy density of battery devices.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present application discloses a battery cell and a manufacturing method therefor, a battery apparatus, and an electrical apparatus. The battery cell comprises an outer housing and an electrode assembly. The outer housing comprises a housing body and a first end wall. The housing body is provided with an opening, and the first end wall closes the opening. The tensile strength of the first end wall at a temperature of 25°C is Rm, where 250 MPa≤Rm≤2000 Mpa is satisfied. The electrode assembly is disposed in the outer housing. The housing body comprises a side wall, and the first end wall and the side wall are connected by means of a weld mark. In the thickness direction of the first end wall, the first end wall has a first surface facing away from the electrode assembly, and in the thickness direction of the side wall, the side wall has a second surface facing away from the electrode assembly. The outer surface of the weld mark is an arc surface, and the outer surface of the weld mark is connected to the first surface and the second surface. The technical solution provided by the present application can effectively improve the reliability of the battery apparatus.
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