Cylindrical Battery Case Connection for Low-Resistance Current Collection
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Solution Overview
Problem
Conventional secondary batteries face challenges in reducing internal resistance and improving current collection efficiency, particularly in designs that require separate electrode tabs, which can lead to increased costs and reliability issues due to tab-related cracks or deformations.
Innovation Solution
The secondary battery design incorporates a negative electrode extension uncoated portion that is folded and connected to the case, eliminating the need for a separate negative electrode tab, and features a protrusion that protrudes downward, reducing internal resistance and enhancing current collection efficiency while preventing tab-related issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate negative electrode tab is used, then electrical connection is achieved, but device complexity and cost increase
Solution Approach 1:
The negative electrode tab function is merged with the case structure itself. The case includes a negative electrode plate that serves as both the structural housing and the electrical connection component, eliminating the need for separate tabs and reducing overall device complexity while maintaining reliable electrical connection.
Solution Approach 2:
The case is designed to perform multiple functions: it provides structural protection as a housing while simultaneously serving as the negative electrode for electrical connection. This multi-functionality reduces the number of separate components needed and simplifies the overall battery structure.
2Reliability
If a separate negative electrode tab is used, then electrical connection is achieved, but manufacturing cost increases
Solution Approach 1:
The negative electrode tab function is merged with the case structure itself. The case includes a negative electrode plate that serves as both the structural housing and the electrical connection component, eliminating the need for separate tabs and reducing overall device complexity while maintaining reliable electrical connection.
Solution Approach 2:
The case is designed to perform multiple functions: it provides structural protection as a housing while simultaneously serving as the negative electrode for electrical connection. This multi-functionality reduces the number of separate components needed and simplifies the overall battery structure.
3Reliability
If conventional electrode design is used, then electrode function is achieved, but internal resistance is high
Solution Approach 1:
The negative electrode plate extends in multiple dimensions within the case structure, creating extensive surface area contact with the electrolyte and improving current collection pathways. This dimensional arrangement reduces internal resistance by providing multiple parallel current collection routes rather than relying on traditional tab connections.
Data Source
AI summary
A secondary battery including an electrode assembly including a positive electrode plate having a positive electrode uncoated portion, a negative electrode plate having a negative electrode uncoated portion, and a separator between the positive electrode plate and the negative electrode plate, a case including a side plate with a cylindrical body, the case accommodating the electrode assembly and a lower plate, the lower plate sealing a lower portion of the side plate, and a cap assembly coupled to an upper portion of the case and electrically connected to the positive electrode plate, the negative electrode uncoated portion including a negative electrode extension uncoated portion of which one end portion is folded, extends downward from the electrode assembly, and is connected to the lower plate of the case.