Battery Insulating Wrap Stitching for Unobstructed Safety Venting
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Solution Overview
Problem
Secondary batteries face challenges in maintaining the operating pressure of safety vents due to the interference caused by insulating members, which can disrupt the normal functioning of the safety vent mechanism.
Innovation Solution
Incorporating a stitch or perforations in a partial region of the insulating member corresponding to the safety vent, ensuring that the insulating member does not alter the operating pressure and allowing the safety vent to function normally by being easily ruptured along with it.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating member is attached to the safety vent, then insulation is provided, but the safety vent cannot function normally due to interference
Solution Approach 1:
The insulating member is divided by a stitch into separate portions, creating an opening that allows the safety vent to operate freely. The segmented structure removes the interference that would otherwise prevent safety vent operation while maintaining insulation coverage in the surrounding areas.
Solution Approach 2:
A portion of the insulating member is effectively removed or disconnected at the stitch location, extracting the interfering part of the insulating material from the safety vent operation zone. This allows the safety vent to function normally while the remaining insulating portions continue to provide insulation.
2Reliability
If a complete insulating member is used to cover the case, then insulation performance is maximized, but the safety vent operating pressure changes
Solution Approach 1:
The insulating member is segmented with a stitch that creates an opening, reducing the overall constraint on the safety vent. This segmentation allows the safety vent to maintain its original operating pressure while the rest of the insulating member continues to provide comprehensive insulation coverage.
Solution Approach 2:
The insulating member exhibits local quality variation where most areas provide full insulation but the stitch region provides reduced or no insulation constraint. This local differentiation allows the safety vent operating pressure to remain unchanged while maintaining overall insulation performance.
Data Source
Figure 1A~1B
Figure 2A~2B
Figure 2C~2D
AI summary
A secondary battery (100) including: a case (110) having a safety vent (115); an electrode assembly (120) in the case (110); a pair of terminals (131, 132) electrically connected to the electrode assembly (120) and respectively coupled at opposite ends of the case (110); and an insulating member (140) wrapped around the case (110) and having with a stitch (141) in a region corresponding to the safety vent (115).