Electrode Stack Side Protection to Prevent Peeling and Terminal Interference
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Solution Overview
Problem
The protective member including a curable resin may peel from the electrode stack, leading to inadequate protection, and extending it to cover the collector terminal side results in interference and reduced structural efficiency.
Innovation Solution
The protective member is disposed on side sections of a rectangular electrode stack formed by stacking preliminary electrode stacks, with the locations of the third and/or fourth side sections not matching in the in-plane direction, extending partway between the innermost and outermost preliminary electrode stacks to enhance anchoring and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the protective member is extended to cover the collector terminal side, then the anchoring strength is improved, but interference with the collector terminal occurs and structural efficiency deteriorates
Solution Approach 1:
The electrode stack is divided into multiple preliminary electrode stacks with different in-plane positions. The protective member is selectively extended only between the third and/or fourth side sections of these segmented stacks, rather than covering the entire collector terminal side, thus achieving anchoring without interference.
Solution Approach 2:
The protective member's extension is applied locally only to specific regions (between side sections of preliminary electrode stacks) rather than uniformly across the entire collector terminal side. This localized application provides anchoring strength precisely where needed while avoiding interference with collector terminals in other areas.
2Reliability
If the protective member is extended to cover the collector terminal side, then the peeling resistance is improved, but excess space must be provided which reduces structural efficiency
Solution Approach 1:
By segmenting the electrode stack into multiple preliminary electrode stacks and selectively extending the protective member only between specific side sections, the design achieves peeling resistance without requiring excess space across the entire structure, thereby maintaining structural efficiency.
Solution Approach 2:
Instead of extending the protective member excessively to cover the entire collector terminal side, the invention applies partial action by extending it only to the necessary extent between side sections of preliminary electrode stacks, achieving adequate peeling resistance without unnecessary space consumption.
Data Source
AI summary
The present disclosure provides an electrode stack with a protective member disposed on a side section, which is resistant to peeling, as well as a battery comprising the electrode stack which is resistant to interference between the collector terminal and protective member and also has satisfactory structural efficiency. The electrode stack 10 of the disclosure is formed by stacking a plurality of preliminary electrode stacks 10′. The locations of the third and/or fourth side sections of those do not mutually match in the in-plane direction of the electrode stack, (i) the protective member 20 extends at least partway between the third side section of the innermost preliminary electrode stack and the third side section of the outermost thereof, and/or (ii) the protective member extends at least partway between the fourth side section of the innermost preliminary electrode stack and the fourth side section of the outermost thereof.