Wound Battery Electrode Adhesive Layer Positioning During Winding
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Solution Overview
Problem
Conventional battery manufacturing methods for wound electrode bodies face challenges in maintaining adhesive layer integrity and positioning, leading to increased costs and reduced reliability due to the need for frequent adjustments in adhesive layer placement across varying battery sizes and configurations.
Innovation Solution
A method involving the formation of a first and second adhesive layer on specific surfaces of the positive electrode sheet and separators, allowing for controlled placement and bonding during the winding process, thereby ensuring the adhesive layer is not damaged and can be precisely positioned, enhancing the formability and reliability of the wound electrode body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separator with an adhesive layer is wound around a reel and then unwound for fabricating a wound electrode body, then the adhesive layer may be damaged or deformed, but this conventional method allows for initial adhesive layer preparation
Solution Approach 1:
The adhesive layer is formed on the separator before the winding process, allowing the separator to be prepared in advance with the adhesive already in place. This preliminary action ensures the adhesive layer is properly positioned and protected during subsequent manufacturing steps, eliminating the need to handle pre-adhesived separators that could get damaged during reel winding and unwinding operations.
2Manufacturing precision
If the position of the adhesive layer is changed for each electrode body size, then the adhesive layer can be precisely positioned, but the cost increases due to frequent adjustments
Solution Approach 1:
The adhesive layer is applied to specific local regions of the separator rather than uniformly across the entire surface. This localized adhesive application allows the same separator design to be used across different battery sizes, as the adhesive is only placed where needed for bonding the electrode sheets, eliminating the need to reposition or redesign the entire adhesive layer for each battery configuration.
3Reliability
If the adhesive layer is formed before winding, then the adhesive layer quality is improved and damage is prevented, but the manufacturing process complexity increases
Solution Approach 1:
The adhesive layer formation step is merged with the separator preparation process, combining two operations into one integrated step. The adhesive is applied directly to the separator during its initial preparation, rather than being added as a separate subsequent step, which simplifies the overall manufacturing process while ensuring high adhesive layer quality from the outset.
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 approach improves the quality and reliability of the adhesive layer, allowing for more consistent and reliable battery production across different sizes and configurations, reducing costs associated with frequent adhesive layer adjustments.
Implementation Method 1
the positive electrode sheet and the first separator are bonded to each other by a first adhesive layer, and the positive electrode sheet and the second separator are bonded to each other by a second adhesive layer
Data Source
AI summary
The present disclosure provides a method for manufacturing includes: an adhesive layer formation step of forming a first adhesive layer on a surface of at least one of a positive electrode sheet and a first separator and forming a second adhesive layer on a surface of at least one of the positive electrode sheet and a second separator; and a wound electrode body fabrication step of fabricating a wound electrode body by winding the first separator, the positive electrode sheet, second separator, and the negative electrode sheet.