Battery Cell Sealing Structure for Cut-Surface Insulation
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Solution Overview
Problem
Conventional battery cells suffer from deteriorated insulation performance due to exposure of the second cut surface of the case, which compromises the electrical insulation when multiple cells are connected in series/parallel.
Innovation Solution
The battery cell design includes a bent first sealing part and a protruding side surface portion of the insulating member to cover both the first and second cut surfaces, enhancing insulation by covering the entire cut surfaces and preventing exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating member covers only the first cut surface, then the manufacturing process is simple, but the second cut surface is exposed causing deteriorated insulation performance
Solution Approach 1:
The insulating member is extended from covering only the first cut surface to also covering the second cut surface by adding a side surface portion that protrudes in the width direction. This dimensional extension ensures both cut surfaces are covered, resolving the insulation performance issue without requiring multiple separate components.
Solution Approach 2:
The insulating member is designed to perform multiple functions: covering the first cut surface, covering the second cut surface, and providing overall insulation. By making the insulating member universal for all cut surfaces, the patent avoids the need for additional separate insulating components while maintaining reliable insulation performance.
2Reliability
If additional components are added to cover exposed cut surfaces, then insulation performance is improved, but device complexity and component quantity increase
Solution Approach 1:
The insulating member is designed to perform multiple functions: covering the first cut surface, covering the second cut surface, and providing overall insulation. By making the insulating member universal for all cut surfaces, the patent avoids the need for additional separate insulating components while maintaining reliable insulation performance.
Solution Approach 2:
The patent merges the coverage of both cut surfaces into a single insulating member structure. The main body portion covers the first cut surface while the side surface portion covers the second cut surface, combining multiple protective functions into one integrated component, thus reducing the total number of parts.
Data Source
AI summary
A battery cell has a case accommodating an electrode assembly; an electrode lead protruding from the case at front and rear ends of the case; a first sealing part formed at both side ends of the case; a second sealing part connecting the first sealing part at a portion in which the electrode lead is formed; a first cut surface formed by cutting the first sealing part; a second cut surface formed by cutting the second sealing part; and an insulating member covering the sealing parts and the cut surfaces, wherein the first sealing part is bent in a direction of a first surface of the case, and a main portion of the insulating member is attached in a shape surrounding the first sealing part and the first cut surface, and wherein a side surface portion of the insulating member surrounds the second sealing part and the second cut surface.