Flexible Battery Current Collector Structure for Heat and Welding Reliability
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Solution Overview
Problem
Existing secondary batteries face challenges in heat generation and damage during welding due to the use of thin metal films in current collectors, which can lead to reduced durability and efficiency.
Innovation Solution
The secondary battery employs a multi-layered metal thin film current collector with thicker sub-plates to increase cross-sectional area, facilitate bending, and prevent damage during welding, while maintaining high capacity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a metal thin film is used for the current collector, then the battery can be made lighter and more flexible, but the heat generation property deteriorates and damage during welding increases
Solution Approach 1:
The current collector is constructed as a composite structure combining a metal thin film (first main plate) with a thicker metal plate (first sub-plate). This composite design allows the thin film to provide light weight and flexibility while the thicker sub-plate provides sufficient cross-sectional area for heat dissipation and welding reliability.
2Ease of operation
If a metal thin film is used for the current collector, then the battery can be made more flexible and easier to bend, but the cross-sectional area is insufficient for heat dissipation
Solution Approach 1:
The current collector is segmented into functionally distinct parts: the first main plate made of metal thin film provides bending flexibility, while the first sub-plate made of thicker metal provides heat dissipation capability. This segmentation allows each part to optimize its specific function without compromising the other.
3Device complexity
If a metal thin film is used for the current collector, then the battery structure can be simplified, but damage during welding increases
Solution Approach 1:
The current collector applies local quality by using different metal thicknesses in different regions. The first main plate uses thin film for areas requiring flexibility, while the first sub-plate uses thicker metal specifically at the welding regions to prevent damage during welding operations.
Data Source
Figure 1~2
Figure 3~4
AI summary
The present disclosure relates to a secondary battery which is entirely made of a multi-layered metal thin film to increase the overall cross-sectional area, thereby improving a heat generation property, and facilitating bending. In an example, disclosed is a secondary battery comprising: an electrode assembly having a first electrode tab and a second electrode tab exposed to both sides, respectively; a first current collector coupled to the first electrode tab of the electrode assembly; a case accommodating the electrode assembly and the first collector and having both sides opened; a first cap plate sealing an opening of one side of the case; and a first terminal coupled to the first current collector and exposed to the outside of the first cap plate, wherein the first current collector includes a first main plate on which the multi-layered metal thin film is overlapped, and a first sub-plate surrounding both ends of the first main plate in the longitudinal direction, respectively.