Battery, battery pack, and electric device

By adjusting the ratio between the weld and the insulating film, the problems of edge curling and insufficient structural strength caused by weld protrusion were solved, thus achieving stable sealing and insulation of the battery.

CN122246378APending Publication Date: 2026-06-19CALB GROUP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CALB GROUP CO LTD
Filing Date
2026-05-19
Publication Date
2026-06-19

AI Technical Summary

⚠Technical Problem

In existing batteries, the weld seam protrudes from the top cover, making it difficult for the insulating film to adhere tightly, which affects the insulation effect. At the same time, the weld seam structure is not strong enough and is prone to failure due to repeated tearing.

⚗Method used

By limiting the ratio between the maximum spacing R of the weld along the height axis and the maximum dimension L of the insulation film extension along the short side, the insulation film is ensured to fit tightly against the top cover, enhancing the structural strength and tear resistance of the weld and preventing warping and failure.

🎯Benefits of technology

It improves the structural strength and tear resistance of the weld, reduces the risk of battery seal failure, and ensures the stability and protective effect of the insulating film.

✦ Generated by Eureka AI based on patent content.

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Abstract

This disclosure provides a battery, a battery pack, and an electrical device. The battery includes a casing and a top cover, with a weld seam formed at the welding joint area between the top cover and the casing. An insulating film is covered on the battery, comprising a main body and an extension. At the short side of the upper end face, the weld seam protrudes from the upper end face by a maximum dimension R mm along the height axis, and the extension seam has a maximum dimension L mm along a first axis, where 0.003 ≤ R / L ≤ 0.08. Compared with related technologies, this disclosure ensures that the ratio between the maximum spacing R of the weld seam along the height axis and the maximum dimension L of the extension seam at the short side of the upper end face satisfies 0.003 ≤ R / L ≤ 0.08. This ensures that the extension seam of the insulating film fits tightly against the top cover, preventing the risk of damage due to edge lifting; simultaneously, it ensures that the weld seam has sufficient structural strength and tear resistance, reducing the risk of battery seal failure.
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