Battery Cell Cover Structure for Corner Sealing Stability
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Solution Overview
Problem
Existing battery cell designs face challenges in maintaining effective sealing at the corner portions of the cover member and preventing displacement due to factors like vibration or vacuuming, which can lead to issues such as short-circuiting of current collectors.
Innovation Solution
The battery cell design incorporates a cover member with protruding portions at the corners that are perpendicular to the battery element's end surface, enhancing sealing and suppressing displacement by pressing against the element, while allowing current collectors to overlap and be accommodated in gaps, with specific area and thickness ratios optimized for improved sealing and space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the exterior film is simply wound around the battery element and the cover member, then the manufacturing process is simple, but the sealing property of the corner portion of the cover member deteriorates
Solution Approach 1:
The cover member is divided into a flat plate portion and a side plate portion that protrudes from it. This segmentation creates distinct functional zones: the flat plate provides a stable base for exterior film winding, while the side plate extends to improve sealing at the corner portions where the exterior film makes contact.
Solution Approach 2:
The side plate protrudes in a direction extending from the flat plate, adding a dimensional element that allows the exterior film to wrap around and contact both the flat plate and the side plate. This creates enhanced sealing at the corner portions without complicating the winding process itself.
2Device complexity
If the exterior film is simply wound around the battery element and the cover member, then the device structure is simple, but the displacement of the cover member cannot be suppressed
Solution Approach 1:
The cover member is segmented into a flat plate portion and a side plate portion. The side plate acts as a stabilizing element that prevents displacement by providing additional contact points and structural support, while the flat plate maintains the primary covering function.
Solution Approach 2:
The side plate has a curved surface that allows the exterior film to wrap around smoothly. This curvature design enables the film to conform to the shape while the side plate maintains its position, preventing displacement during operation or vacuuming processes.
3Reliability
If the protruding portion is added to the cover member, then the sealing property of the corner portion is improved, but the device complexity increases
Solution Approach 1:
The cover member is divided into functional segments: the flat plate portion for basic covering and the side plate protruding portion for enhanced sealing. This segmentation allows each part to perform its specific function efficiently without requiring complex integrated designs.
Solution Approach 2:
The side plate extends in a direction from the flat plate, utilizing an additional spatial dimension to achieve improved sealing. This approach adds functionality without requiring complex modifications to the existing flat plate structure, maintaining relative simplicity while enhancing performance.
Data Source
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AI summary
The battery cell (10) includes a battery element (100), a front cover member (210) that covers an end surface of the battery element (100), and an exterior film (300) wound around the battery element (100) and the front cover member (210). The front cover member (210) includes at least one corner portion covered with the exterior film (300) and a front protruding portion (214) that protrudes from at least a part of the corner portion. The front protruding portion (214) and the end surface of the battery element (100) are arranged in a direction perpendicular to the end surface of the battery element (100).