Secondary Battery Electrode Folding Line Design
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving optimal electrical contact between current collectors and uncoated parts of the electrode assembly, leading to subpar performance.
Innovation Solution
The introduction of a folding line or groove in the uncoated parts of the electrode assembly, with supporting elements or plates to facilitate better contact with current collectors, increasing the contact area and improving uniformity and ease of formation of the electrode assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the uncoated part is made flat and simple, then the manufacturing process is easy, but the electrical contact area with the current collector is insufficient
Solution Approach 1:
The uncoated part is designed with a folded structure containing folding lines instead of being flat. This curvature/folding increases the surface area that contacts the current collector, improving electrical contact quality without adding complex external components to the electrode assembly.
Solution Approach 2:
The uncoated part is divided into multiple regions by folding lines, creating a segmented folded structure. This segmentation increases the effective contact area with the current collector while maintaining the simplicity of the electrode assembly as a single integrated component.
2Reliability
If the contact area between current collector and uncoated part is increased, then electrical contact is improved, but the formation process becomes more difficult
Solution Approach 1:
The folding lines are pre-formed in the uncoated part during electrode assembly manufacturing, before the formation process. This preliminary structuring ensures proper contact geometry is already in place, making the subsequent formation process easier rather than more difficult.
Solution Approach 2:
The folded structure with increased surface area is built into the uncoated part design itself, so the increased contact area is achieved through geometry rather than complex assembly steps during formation, maintaining ease of manufacture.
3Stability of the object's composition
If supporting elements are added to the penetration holes, then the folding part is better supported, but the device complexity increases
Solution Approach 1:
The supporting elements are integrated within the electrode assembly structure itself, utilizing the existing uncoated part and folding line geometry. The support function is merged into the structural design rather than being a separate external component system.
Solution Approach 2:
The folding structure with supporting elements is designed to self-support during the formation and operation processes. The geometry of the folded uncoated part itself provides the necessary support, eliminating the need for additional active support mechanisms or complex control systems.
Data Source
AI summary
A secondary battery including an electrode assembly, the electrode assembly including electrode plates and a separator interposed between the electrode plates, at least one of the electrode plates including a coated part, the coated part including a metallic plate having an active material coated thereon, and an uncoated part, the uncoated part including a metallic plate without active material coated thereon, the uncoated part including a folding line in the uncoated part, and a folding part with an end portion folded with respect to the folding line; and a current collector electrically contacting the folding part.