Battery Cell Insulation Structure for Welding Mark Piercing Risk
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Solution Overview
Problem
Existing battery cells face challenges in maintaining effective insulation due to the risk of welding mark regions piercing through insulating members, leading to potential short circuits and safety hazards such as fires or explosions.
Innovation Solution
The battery cell design incorporates a first insulating member with a thickened region that covers the welding mark region on the housing, enhancing insulation by preventing penetration and improving coverage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard insulating member is used to cover the housing outer surface, then the insulation coverage is provided, but the welding mark region may pierce through the insulating member causing insulation failure
Solution Approach 1:
The insulating member is designed with a thickened region specifically at the welding mark region, creating local quality variation. This thickened region has greater thickness than other areas of the insulating member, providing enhanced protection against piercing while maintaining standard thickness in non-critical areas, thus resolving the contradiction between reliable insulation coverage and piercing resistance.
2Reliability
If the insulating member thickness is increased uniformly across the entire surface, then piercing resistance is improved, but material consumption and device complexity increase
Solution Approach 1:
Instead of uniform thickness increase, the insulating member features a localized thickened region only at the welding mark area. This approach provides enhanced piercing resistance where needed while minimizing insulating material consumption in non-critical areas, effectively resolving the contradiction between piercing resistance and material efficiency.
3Productivity
If the insulating member is covered in the circumferential direction of the housing, then production efficiency is improved, but alignment precision with the welding mark region may be compromised
Solution Approach 1:
The thickened region is pre-formed on the insulating member during the insulating member manufacturing process, before the insulating member is assembled to the housing. This preliminary action ensures that when the insulating member is rapidly assembled in the circumferential direction, the thickened region is already positioned correctly to cover the welding mark region, thus resolving the contradiction between production efficiency and alignment accuracy.
Data Source
AI summary
Provided are a battery cell, battery, and an electrical equipment. The battery cell includes a housing and a first insulating member. The housing provides a welding mark region. The first insulating member is arranged on an outer surface of the housing, and the first insulating member provides a first thickened region, wherein the first thickened region covers at least a portion of the welding mark region. This reduces the risk of the welding mark region piercing through the first insulating member, which could cause insulation failure of the battery cell. Thus, the insulation performance of the battery cell is improved.