Columnar Battery Terminal Insulation Structure to Prevent Short Circuits
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Solution Overview
Problem
The existing columnar batteries face a risk of short circuits between the end wall and the current collector structure due to gaps between the lower plastic component and the insulation sealing member.
Innovation Solution
The secondary battery design incorporates an integrally formed insulation sealing member that completely surrounds the terminal hole, with overlapping projections of the internal insulation part and lower plastic component to eliminate gaps, and includes thinning structures and positioning gaps to enhance insulation and assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an integrated insulating member is used with a gap between the lower plastic component and the insulating member, then the device complexity is reduced, but the reliability deteriorates due to short circuit risk
Solution Approach 1:
The patent merges the lower plastic component and the insulating member into a single integrated component. The lower plastic component is designed with an insulating member forming portion that integrates both functions into one piece, eliminating the gap between separate components and ensuring reliable insulation while maintaining structural simplicity
Solution Approach 2:
The insulating member is nested within the lower plastic component structure. The insulating member forming portion is positioned inside the lower plastic component, with the seal wall extending downward to contact the upper surface of the lower plastic component, creating a nested configuration that ensures complete insulation coverage
2Ease of manufacture
If the insulating member and lower plastic component are separate with a gap between them, then the ease of manufacture is improved, but the reliability deteriorates due to short circuit risk
Solution Approach 1:
The patent combines the insulating member and lower plastic component into a single integrated component that can be manufactured as one piece. The insulating member forming portion is integrated into the lower plastic component, allowing for simplified manufacturing processes while ensuring reliable insulation without gaps
3Reliability
If the internal insulation part and lower plastic component overlap without thinning structure, then the insulation reliability is improved, but the volume increases due to overlap space occupation
Solution Approach 1:
The patent applies local quality by creating a thinning structure in the overlapping region between the internal insulation part and the lower plastic component. The insulating member forming portion has a reduced thickness in the overlap area, ensuring insulation reliability while minimizing the volume occupied by the overlap
Solution Approach 2:
The patent resolves the volume issue by changing the dimensional configuration in the overlapping region. The thinning structure reduces the thickness dimension of the insulating member forming portion where it overlaps with the lower plastic component, maintaining insulation coverage while reducing overall volume
Data Source
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AI summary
Disclosed are a secondary battery (100), a battery assembly (10), and an electronic device (1). The secondary battery includes a housing (110), an electrode assembly (120), a terminal (140), an insulation sealing member (150), and a lower plastic component (160). The housing includes an end wall (111), and the end wall is provided with a terminal hole (1111). The terminal includes a columnar part (142), an outer flange (143), and an inner flange (141). The columnar part (142) passes through the terminal hole. The outer flange is located outside the housing, and extends from the columnar part toward the outer periphery of the end wall. The inner flange is located inside the housing, and extends from the columnar part toward the outer periphery of the end wall. The external insulation part of the insulation sealing member is located between the outer flange and the end wall.