Columnar Battery Terminal Insulation Structure for Gap-Free Sealing
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Solution Overview
Problem
The existing columnar batteries face a risk of short circuit 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 includes an integrally formed insulation sealing member that completely surrounds the terminal hole, with the internal insulation part and lower plastic component overlapping along the thickness direction of the end wall to eliminate gaps, and incorporates 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 an integrated insulating assembly where the lower plastic component is positioned within a recess of the insulating member. This integration eliminates gaps between separate components while maintaining structural simplicity, thereby improving insulation reliability without significantly increasing device complexity.
2Ease of manufacture
If the lower plastic component and insulating member are positioned separately, then the ease of manufacture is improved, but the reliability deteriorates due to potential gaps causing short circuits
Solution Approach 1:
The patent implements a nesting structure where the lower plastic component is positioned within a recess formed in the insulating member. This nested arrangement ensures that the two components fit together precisely without gaps, improving insulation reliability while maintaining ease of manufacture through straightforward assembly of nested parts.
3Reliability
If the insulating member completely surrounds the terminal hole, then the insulation reliability is improved, but the volume of the insulating member increases
Solution Approach 1:
The patent applies local quality by providing insulation specifically where needed - the insulating member surrounds the terminal hole and the lower plastic component is positioned within a recess at the specific location where insulation is critical. This localized approach ensures reliable insulation at the terminal connection point while minimizing the overall volume of the insulating member by not providing uniform insulation throughout the entire structure.
Data Source
AI summary
Disclosed are a secondary battery, a battery assembly, and an electronic device. The secondary battery includes a housing, an electrode assembly, a terminal, an insulation sealing member, and a lower plastic component. The housing includes an end wall, and the end wall is provided with a terminal hole. The terminal includes a columnar part, an outer flange, and an inner flange. The columnar part 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 insulation sealing member includes an integrally formed external insulation part, a hole insulation part, and an internal insulation part. The external insulation part is located between the outer flange and the end wall.