Wound Electrode Body Structure for Easier Battery Recycling Separation
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Solution Overview
Problem
The existing techniques for recycling valuable metals from used electric storage devices face inefficiencies due to the need for increased separation processes, leading to reduced collection rates and higher reproduction costs, as both positive and negative electrode plate metals are present in the same metal solution.
Innovation Solution
The electrode body is designed with a specific configuration where the first and second separators are adhered to their respective electrode plates but not to each other, allowing for easy unwinding and separation of the electrode plates, enabling individual processing and improving metal collection efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If both positive and negative electrode plates are processed together in the same metal solution, then the reproduction process is simplified, but the collection rate of valuable metals decreases and reproduction cost increases
Solution Approach 1:
The electrode body is segmented into separate positive and negative electrode plate groups through the unwinding structure. The first separator is adhered to the first electrode plate but not the second electrode plate, creating distinct groups that can be processed separately. This segmentation allows for separate metal solution processing, improving collection rates while maintaining reasonable process complexity.
2Productivity
If multiple separation processings are implemented to collect valuable metals from mixed metal solution, then the collection rate of valuable metals improves, but the reproduction cost increases
Solution Approach 1:
The electrode body is prepared in advance with a specific winding structure where separators are selectively adhered to create pre-segregated electrode plate groups. This preliminary action of structural design enables easy separation during reproduction, avoiding the need for complex separation processings and reducing reproduction costs while maintaining high collection rates.
3Ease of operation
If the electrode body is designed with selective adhesion of separators to electrode plates, then the ease of separation improves, but the manufacturing complexity increases
Solution Approach 1:
The separator structure exhibits local quality differences through selective adhesion properties. The first separator is adhered to the first electrode plate but not the second electrode plate, creating localized adhesion zones. This local quality differentiation enables easy separation at specific locations while keeping the overall manufacturing process manageable.
Data Source
AI summary
A herein disclosed electrode body is a wound body in which, via a first separator 30A and a second separator 30B, a positive electrode plate 10 and a negative electrode plate 20 are wound therein. The first separator 30A is adhered to the positive electrode plate 10, but not adhered to the negative electrode plate 20. On the other hand, the second separator 30B is adhered to the negative electrode plate 20, but not adhered to the positive electrode plate 10. Then, both of a second terminal end part 30Be of the second separator 30B and a first terminal end part 30Ae of the first separator 30A are exposed to an outer surface of the wound body. In addition, a separator wound part 40s in which the first separator 30A and the second separator 30B are wound therein includes a non-adhesion area 30X where the separators are not adhered to each other. Then, on the outermost surface of the wound body, a first adhesive tape 80 is attached, and a first peeling part 82 is formed at one of end parts of the first adhesive tape 80. In accordance with such a configuration, it is possible to easily disassemble the electrode body so as to separate a pair of electrode plates.