Battery Cell Connecting Member Insulation Near the Housing
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Solution Overview
Problem
Existing battery cells face challenges in improving internal insulation performance, leading to potential short circuits and reduced reliability due to insufficient insulation between connecting members and the housing, especially in high-integration manufacturing processes.
Innovation Solution
Incorporating multiple insulating layers and portions on the connecting member surfaces to enhance insulation, including first, second, and third insulating layers on different connecting portions, and using a bent connecting portion for flexible electrode terminal positioning, with insulating layers disposed between the connecting member and housing to prevent electrification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the connecting member is positioned close to the housing to reduce space, then the battery cell integration is improved, but the insulation performance deteriorates causing potential electrification of the housing
Solution Approach 1:
An insulating component is introduced as an intermediary element between the connecting member and the housing. This insulating component includes an insulating portion that contacts the connecting member and an insulating layer disposed between the insulating portion and the housing, effectively mediating the spatial relationship while maintaining electrical insulation even when the connecting member is positioned close to the housing.
Solution Approach 2:
The insulating component is constructed using composite material structure combining an insulating portion (such as insulating tape wrapped around the connecting member) and an insulating layer (disposed between the insulating portion and housing). This composite structure provides enhanced insulation performance in the limited space between the connecting member and housing.
2Reliability
If insulating components are added to improve insulation performance, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The insulating component merges multiple insulation functions into a single integrated component. The insulating portion (wrapped around the connecting member) and the insulating layer (between the insulating portion and housing) work together as a unified insulation system, simplifying the overall structure while maintaining reliable insulation performance.
3Adaptability or versatility
If insulating components are disposed after pre-assembly of connecting member and housing, then the manufacturing flexibility is maintained, but the processing efficiency deteriorates due to difficulty in disposition
Solution Approach 1:
The insulating component is pre-prepared with the insulating portion wrapped around the connecting member before assembly. This preliminary preparation of the insulating component facilitates easier and more efficient installation during the assembly process, improving processing efficiency while maintaining manufacturing flexibility.
Data Source
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AI summary
Embodiments of this application provide a battery cell and a preparation method thereof, a battery, an electric apparatus, and an energy storage apparatus, improving the internal insulation performance of the battery cell. The battery cell includes: a housing; an electrode assembly, where the electrode assembly is accommodated in the housing; an electrode terminal, where the electrode terminal is disposed on the housing; and a connecting member, where the connecting member is configured to connect the electrode terminal and the electrode assembly and a first insulating portion is disposed on at least a portion of a surface of the connecting member facing the housing.