Thermal Laminated Cell Pouch Structure for Faster Electrolyte Wetting
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Solution Overview
Problem
The manufacturing process of thermal composite laminated cells faces difficulties in electrolyte injection and wetting due to the tight compression of cathode and anode plates, affecting battery performance.
Innovation Solution
A thermal composite laminated cell design featuring a composite unit with first and second separators forming pouch-like structures, where electrode plates are placed inside these structures and not directly attached to the separators, allowing for easier electrolyte injection and wetting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the separator is completely thermally laminated to the side surfaces of the anode plates or cathode plates with tight compression, then the structural integrity and thermal stability of the cell are improved, but the electrolyte injection becomes difficult and injection time increases
Solution Approach 1:
The separator is divided into multiple sections: fully laminated portions for thermal stability and non-laminated pouch-like structures for electrolyte injection. This segmentation allows different regions of the separator to serve different functions simultaneously.
Solution Approach 2:
Different regions of the separator have different properties: some areas are fully thermally laminated to cathode/anode plates for structural stability, while other areas remain non-laminated to form pouch-like structures that facilitate electrolyte injection and wetting.
2Stability of the object's composition
If the separator is completely thermally laminated to the electrode plates with tight compression, then the thermal stability is improved, but the electrolyte wetting becomes difficult
Solution Approach 1:
The separator is segmented into fully laminated regions and non-laminated pouch-like regions, allowing electrolyte to effectively wet the electrode plates through the non-laminated areas while maintaining thermal stability in laminated areas.
Solution Approach 2:
The separator exhibits local quality variation with non-laminated pouch-like structures providing pathways for electrolyte wetting while laminated portions provide thermal stability, resolving the contradiction between these two requirements.
3Strength
If the cathode plates and anode plates are pressed very tightly during thermal lamination, then the structural integrity is improved, but the difficulty in electrolyte injection increases
Solution Approach 1:
The cell structure is segmented into tightly compressed laminated regions for structural integrity and non-laminated pouch-like regions with larger spacing that facilitate electrolyte injection, allowing both requirements to be met simultaneously.
Solution Approach 2:
Different regions of the cell have different compression levels: high compression in laminated areas for structural strength, and low compression in pouch-like areas for ease of electrolyte injection.
Data Source
AI summary
A thermal composite laminated cell and a battery are disclosed. The thermal composite laminated cell is formed by folding a composite unit, and the composite unit includes a first separator, a second separator, first electrode plates and second electrode plates. Portions of the first separator and the second separator are fixedly connected to form pouch-like structures each with an opening. The first electrode plates are placed inside the respective pouch-like structures, and the second electrode plates are alternately arranged at a side of the first separator away from the first electrode plates and at a side of the second separator away from the first electrode plates along the length direction of the composite unit.