Battery Electrode Laminate Adhesive Pattern for Clean Separator Cutting
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Solution Overview
Problem
Conventional methods of producing laminates for secondary batteries result in separator peeling and curling during cutting, which compromises the integrity and safety of the battery structure.
Innovation Solution
A specific distribution of adhesive material is applied to the affixing surfaces of the negative electrode and separator, with higher coating weights in non-projected sections to inhibit separator curling and peeling, and the adhesive is strategically avoided at edge regions to prevent attachment to cutting tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive material is applied uniformly across the entire affixing surface, then the separator adheres well to the negative electrode, but the separator peels and curls during cutting
Solution Approach 1:
The patent applies adhesive material with different coating weights in different regions: a first coating weight in the projected section (where the positive electrode is located) and a second coating weight (higher by at least 0.02 g/m²) in the non-projected sections (first and second non-projected parts). This local differentiation prevents peeling at cut sections while maintaining adequate adhesion where needed, resolving the contradiction between adhesion strength and separator integrity during cutting.
2Strength
If adhesive material is applied at edge regions to prevent peeling, then adhesion improves, but the adhesive attaches to cutting tools during cutting
Solution Approach 1:
The patent strategically positions adhesive coating regions to provide adequate adhesion in the projected section and first/second non-projected parts while deliberately avoiding adhesive application at the extreme edge regions. This local differentiation prevents both peeling and adhesive attachment to cutting tools during the cutting process, resolving the contradiction between adhesion strength and manufacturing ease.
3Productivity
If the separator and negative electrode are cut to match the positive electrode size, then production efficiency improves, but safety is compromised
Solution Approach 1:
The patent enables the separator and negative electrode to be cut to the same size as the positive electrode (improving production efficiency) while compensating for safety concerns through localized adhesive application with enhanced coating weights in non-projected sections. This ensures the larger separator edges remain securely attached and do not peel or curl, maintaining safety while achieving efficient production.
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
The solution effectively inhibits separator curling and peeling during production, ensuring the integrity of the laminate and resulting secondary battery, thereby enhancing battery performance and safety.
Implementation Method 1
adhesion of battery members in production of a laminate for a secondary battery, such as adhesion of an electrode web and a separator web, is performed by producing a battery member that includes an adhesive material at a surface thereof
Data Source
AI summary
A method of producing a laminate includes: a step (A) of producing an affixed body including a negative electrode material and separator webs affixed to both surfaces of the negative electrode material or an affixed body including a negative electrode material, a first separator web, a positive electrode, and a second separator web affixed in stated order; and a step (B) of cutting the affixed body. The step (A) includes a step (al) of applying an adhesive material at affixing surfaces of the negative electrode material and the separator webs. The adhesive material is applied in the step (al) such that a first coated section including a region where the adhesive material is applied with a coating weight M1 and a second coated section including a region where the adhesive material is applied with a coating weight M2≥(M1+0.02 g/m2) are located alternately in a longitudinal direction.