Lithium Battery Separator With Penetrating Adhesive Dots
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Solution Overview
Problem
Conventional lithium battery separators with porous coating layers on porous bases often experience weak adhesion to electrodes, leading to separation and deformation during battery cell assembly, which affects the battery's lifetime characteristics.
Innovation Solution
A separator design featuring a porous coating layer with a first adhesive layer comprising dots that penetrate through the coating layer to the base, enhancing adhesion to the electrode, and a second adhesive layer on the opposite side, improving the separator's interaction with the electrolyte and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a porous coating layer is disposed on a porous base to improve ion conductivity, then the battery capacity is improved, but the adhesion to the electrode deteriorates causing separation and deformation
Solution Approach 1:
The adhesive layer is configured with a dot pattern rather than a continuous layer, creating local adhesive regions distributed across the separator surface. This local quality approach maintains ion conductivity in non-adhesive areas while providing targeted adhesion at dot locations, resolving the contradiction between ion conductivity and electrode adhesion
Solution Approach 2:
The adhesive layer is designed with a porous structure that allows electrolyte penetration and ion transport through the adhesive dots. This porous configuration enables the adhesive regions to maintain both bonding function and ion conductivity, simultaneously achieving improved adhesion and preserved battery capacity
2Ease of manufacture
If the separator structure is simplified to reduce manufacturing complexity, then the ease of manufacture is improved, but the adhesion and structural stability deteriorate
Solution Approach 1:
The adhesive layer is segmented into multiple discrete dots rather than a continuous layer, simplifying the manufacturing process while maintaining structural stability. The dot pattern is easier to manufacture than a continuous adhesive layer with controlled porosity, yet provides sufficient adhesion and structural support through the distributed adhesive regions
Solution Approach 2:
The separator comprises a composite structure combining the porous base, porous coating layer, and dot-patterned adhesive layer. This composite material approach achieves structural stability and adhesion through material composition rather than complex structural design, simplifying manufacturing while maintaining strength
Data Source
AI summary
A separator for a lithium battery includes a porous coating layer disposed on a surface of a porous base, and a first adhesive layer including a plurality of dots disposed at intervals at a surface of the porous coating layer, the plurality of dots of the first adhesive layer penetrating through the porous coating layer to be on the surface of the porous base.