Secondary Battery Cap Plate Current Collector Integration
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Solution Overview
Problem
Rechargeable batteries face a trade-off between portability and capacity, where increasing portability reduces capacity and vice versa, making it challenging to achieve both high portability and high capacity simultaneously.
Innovation Solution
The design incorporates a first current collecting member integrally formed with the cap plate, bent inward to connect with the electrode, and a simplified configuration that increases internal space, allowing for a higher capacity battery while minimizing resistance and current loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery size is increased to increase capacity, then capacity is improved, but portability is deteriorated
Solution Approach 1:
The current collecting member is integrally formed with the cap plate, merging two previously separate components into one. This integration eliminates the need for separate connection structures, reduces internal space requirements, and allows for more efficient use of battery volume, thereby increasing capacity without proportionally increasing overall size
Solution Approach 2:
The current collecting member is bent into a three-dimensional configuration that extends from the cap plate into the battery interior. This spatial arrangement optimizes electrical connection efficiency while minimizing the volume occupied by current collecting structures, allowing better packing of active materials and improved capacity-to-volume ratio
2Volume of moving object
If the battery size is reduced to improve portability, then portability is improved, but capacity is reduced
Solution Approach 1:
The design changes the geometric parameters of the current collecting member by bending it into a specific configuration. This optimized shape reduces the volume required for current collection while maintaining electrical conductivity, allowing more space for active materials and improving capacity within a compact form factor
3Reliability
If a complex connection structure is used between electrode terminal and current collecting member, then connection reliability is improved, but device complexity increases
Solution Approach 1:
The cap plate and current collecting member are formed as a single integrated component, eliminating multiple connection interfaces and assembly steps. This integration maintains electrical connection reliability while significantly reducing structural complexity and the number of parts requiring precision assembly
4Loss of energy
If the internal structure is simplified to reduce resistance, then current loss is reduced, but connection strength may be weakened
Solution Approach 1:
The integral formation of the cap plate and current collecting member creates continuous metal pathways without intermediate connections or joints. This eliminates contact resistance at interfaces while the inherent material continuity maintains mechanical strength, achieving both low resistance and strong connection simultaneously
Data Source
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AI summary
A rechargeable battery according to an exemplary embodiment of the present invention includes: an electrode assembly that includes a first electrode, a second electrode, and a separator that is disposed between the first electrode and the second electrode; a case that receives the electrode assembly and includes an opening; a cap plate that is coupled to the opening and includes a cutout; and a first current collecting member that is integrally formed with the cap plate and thus is bent toward the inside of the case from the cap plate, and is electrically connected with the first electrode.