Secondary Battery Current Collector Tab Bundling
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Solution Overview
Problem
Current secondary battery designs face issues with current collector tab bending, which can lead to damage and reduced battery performance due to the lack of effective mechanisms to maintain tab shape and reduce stress within the battery case.
Innovation Solution
The secondary battery incorporates a configuration where current collector tabs are bundled in a stacked state at a location different from their joined portion, using solid phase joining or an adhesive layer to maintain a constant shape and reduce bending, and optionally employs a fixing member to further suppress bending and enhance tab stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current collector tabs are accommodated in the battery case without bundling, then the battery case can be simpler in structure, but the tabs are prone to bending and damage
Solution Approach 1:
Multiple current collector tabs are bundled together into a single integrated unit, merging several separate tabs into one consolidated structure that is more resistant to bending and damage while maintaining electrical connectivity
2Ease of manufacture
If current collector tabs are joined to current collector terminal at the same location where they are bundled, then the connection process is simpler, but the tabs experience larger bending loads and potential damage
Solution Approach 1:
The current collector tab assembly is divided into distinct functional segments: a bundling portion where tabs are consolidated, a middle portion that maintains constant shape, and a joined portion that connects to the terminal. This segmentation allows each portion to be optimized for its specific function without compromising the others
3Adaptability or versatility
If current collector tabs are allowed to bend freely in the battery case, then the tabs can adapt to space constraints, but the bending causes damage and reduces battery performance
Solution Approach 1:
The current collector tabs are pre-shaped and bundled into a constant shape configuration before being installed in the battery case. This preliminary formation of the desired shape prevents bending and deformation during installation and operation, ensuring optimal electrical connectivity and battery performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses tab bending, reduces damage risk, and maintains tab shape, thereby improving battery performance and resistance while accommodating the electrode body in the battery case.
Implementation Method 1
The plurality of current collector tabs are joined to each other by solid phase joining or with an adhesive layer at the bundled portion
Data Source
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AI summary
Provided is a technique for accommodating current collector tabs joined to current collector terminals inside a battery case in a better state. The secondary battery (100) disclosed herein has an electrode body (20), a battery case (10) that accommodates the electrode body (20), and current collector terminals (30, 40) attached to the battery case (10). The electrode body (20) comprises a plurality of current collector tabs (21t, 22t). The plurality of current collector tabs (21t, 22t) have a bundled portion (Tl) where the current collector tabs (21t, 22t) are bundled in a stacked state, and a joined portion (90) joined to the current collector terminal (30, 40).