Battery Electrode Tab Structure With Joined Separators at Bend Boundary
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Solution Overview
Problem
Electrode tab groups in batteries are prone to damage at the boundary portion between the active material layer and the tab exposed area, leading to potential mechanical weakness.
Innovation Solution
The battery design incorporates a laminate structure with separators joined together at specific points to disperse the load applied to the electrode tab group, particularly at the softer bend portion, enhancing mechanical strength and inhibiting damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the electrode tab group is bent to arrange along the side wall for compact battery design, then the battery volume is reduced, but the boundary portion of the electrode tab is prone to damage
Solution Approach 1:
The separator is pre-folded along the bending line before the electrode tab is bent, creating a cushioning structure in advance. This preliminary folding action prepares the separator to absorb and disperse the load that will be applied during subsequent bending operations, preventing damage to the electrode tab boundary portion while enabling compact battery design
Solution Approach 2:
The folded separator creates a cushioning layer between the bending stress and the electrode tab boundary portion. This beforehand cushioning structure disperses the concentrated load that would otherwise damage the electrode tab, allowing the tab to be bent into a compact configuration without compromising its structural integrity or reliability
2Strength
If the separator is folded to create a cushioning effect, then the load dispersion and mechanical strength are improved, but the manufacturing process complexity increases
Solution Approach 1:
The separator is divided into distinct functional zones: a folding section with the bend line where folds are created to provide cushioning, and a remaining section that maintains its original structure. This segmentation allows the complex cushioning function to be localized to a specific portion of the separator, simplifying the overall manufacturing process while achieving the desired mechanical strength enhancement
Data Source
AI summary
A battery is provided in which damage of the electrode tab group is suitably inhibited. In a suitable embodiment of the herein disclosed battery, the positive electrode tab includes a boundary portion between a forming area in which a protective layer is disposed and a tab exposed area in which the positive electrode tab is exposed. At least a part of the separators among the separators configuring the electrode body having a laminate structure are joined to each other, and at least a part of the join part is closer to the boundary portion.