Wound Battery Insulating Covers for Tab Isolation
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Solution Overview
Problem
Lithium ion secondary batteries face risks of electric shock and short circuits due to potential contact between current-collecting tabs, leads, and the outer can, especially under vibration or shock, which can lead to insulation failures and safety hazards.
Innovation Solution
The implementation of positive and negative electrode insulating covers made of U-shaped members with sandwiching members and insulating materials, such as polypropylene, to securely engage with the current-collecting tabs and leads, preventing contact with the outer can and maintaining insulation even under mechanical stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating structures are added to prevent contact between current-collecting tabs/leads and the outer can, then safety and insulation reliability are improved, but device complexity increases
Solution Approach 1:
The insulating cover is integrated into the sealing plate structure, forming a nested configuration where the insulating cover is positioned within or as part of the sealing plate assembly. This integration reduces the number of separate components while maintaining the insulation function, thereby improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The insulating cover is made from insulating material that can conform to the internal geometry of the battery, providing flexible insulation coverage. This allows effective insulation protection without requiring complex rigid structures, balancing reliability improvement with manageable structural complexity.
2Reliability
If insulating covers are added to secure current-collecting tabs and leads, then insulation reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating cover is combined with the sealing plate assembly, merging multiple functions (sealing and insulation) into a single integrated component. This reduces the total number of parts that need to be manufactured and assembled, thereby improving insulation reliability while minimizing the increase in manufacturing complexity.
Solution Approach 2:
The sealing plate assembly serves multiple functions: it provides sealing for the battery and simultaneously houses the insulating cover to prevent electrical contact. This multi-functionality reduces the need for separate dedicated insulating components, simplifying manufacturing while ensuring insulation reliability.
3Volume of moving object
If the battery uses a compact design without additional insulating components, then volumetric efficiency is improved, but the risk of electric shock and short circuit increases
Solution Approach 1:
The insulating cover is nested within the sealing plate assembly, utilizing the existing structural space rather than adding external protruding components. This maintains a compact overall battery volume while still providing the necessary insulation protection against electric shock and short circuits.
Solution Approach 2:
The insulating cover uses thin insulating material that provides effective electrical isolation without occupying significant volume. This allows the battery to maintain high volumetric efficiency while still protecting against harmful electrical contact under vibration or shock conditions.
Data Source
AI summary
According to one embodiment, there is provided a battery. The battery includes a metallic outer can, a wound electrode group, a positive electrode-lead, a negative electrode-lead, a positive electrode insulating cover, and a negative electrode insulating cover.