Rechargeable Battery Parallel Electrode Connection Stability
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Solution Overview
Problem
Existing rechargeable batteries face challenges in achieving high capacity and stability due to limitations in connecting electrode assemblies in parallel, leading to output and capacity decreases.
Innovation Solution
The described rechargeable battery design connects multiple electrode assemblies in parallel within a case, with specific lead tab configurations that include adhered, coupled, and welded portions to stabilize and securely connect uncoated regions, reducing output and capacity decreases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple electrode assemblies are connected in parallel to achieve high capacity, then the battery capacity increases, but the stability and reliability decrease due to connection issues
Solution Approach 1:
The battery is divided into multiple electrode assemblies connected in parallel, with each assembly having separate uncoated regions at different locations (center and edge). This segmentation allows independent connection points for each electrode assembly, improving connection reliability while maintaining high capacity through parallel configuration.
Solution Approach 2:
Different regions of the electrode assemblies are utilized with specific functions: uncoated regions at the center are connected to a first lead tab, while uncoated regions at the edge are connected to a second lead tab. This local differentiation optimizes the connection structure for each specific region, enhancing overall connection stability.
2Ease of manufacture
If lead tabs are simply connected to uncoated regions, then the manufacturing process is simple, but the connection stability and resistance to pressure/impact is insufficient
Solution Approach 1:
The lead tabs are designed with bent portions that can flex and adapt to mechanical stress. The first lead tab has a bent portion connecting the first electrode terminal to the first uncoated region, and the second lead tab has bent portions connecting the second electrode terminal to the second uncoated regions. This dynamic structure allows the lead tabs to absorb pressure and impact while maintaining electrical connection.
3Device complexity
If uncoated regions are disposed at the same location, then the connection structure is simple, but the battery experiences output and capacity decreases due to insufficient connection stability
Solution Approach 1:
The uncoated regions are asymmetrically distributed within the electrode assemblies, with some located at the center and others at the edge. This asymmetric arrangement creates multiple connection points at different locations, improving connection stability and preventing output/capacity decreases while maintaining reasonable structural complexity.
Data Source
AI summary
A rechargeable battery includes at least two electrode assemblies including electrodes on opposite surfaces of a separator, a case accommodating the electrode assemblies, a cap plate coupled to an opening of the case, first and second electrode terminals in the cap plate, and first and second lead tabs connected to respective first and second electrode terminals and to respective uncoated regions of the two electrode assemblies, wherein a first uncoated region of each of the two electrode assemblies is at a center of the case and is connected to the first lead tab, and wherein a second uncoated region of each of the two electrode assemblies is at an edge of the case and is connected to the second lead tab.