Adhesive Layer for Battery Separator and Electrode Bonding
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Solution Overview
Problem
Conventional secondary battery members often experience deviations between electrodes and separators, leading to unsatisfactory assembly workability.
Innovation Solution
An adhesive layer is introduced between the separator and electrode, composed of a resin derived from α-olefins with 2 to 4 carbon atoms, occupying 10 to 80% of the layer, and optionally including a nonionic surfactant, applied in a composition with an organic solvent and water, to enhance bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If no adhesive layer is used between separator and electrode, then device complexity is reduced, but bonding strength is insufficient causing deviation between components
Solution Approach 1:
An adhesive layer comprising a resin with specific structural units (including units from vinyl esters of fatty acids with 4-22 carbon atoms) is introduced as an intermediary between the separator and electrode. This adhesive layer occupies 1-90% of the total layer area and provides sufficient bonding strength to prevent deviation, while maintaining relatively simple device structure.
2Strength
If adhesive layer with high resin content is used, then bonding strength is improved, but productivity decreases due to complex application process
Solution Approach 1:
The adhesive layer's composition parameters are optimized by specifying resin content occupying 1-90% of the layer and controlling the ratio of specific structural units (vinyl ester units from 4-22 carbon atom fatty acids). This parameter optimization achieves sufficient bonding strength while enabling efficient assembly processes with improved productivity.
3Strength
If adhesive layer is introduced, then bonding strength is improved, but device complexity increases
Solution Approach 1:
The adhesive layer is designed as a composite material containing a resin with specifically controlled structural units, including vinyl ester units from fatty acids with 4-22 carbon atoms. This composite structure provides enhanced bonding strength while the controlled composition helps manage the complexity of the layered battery structure.
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 adhesive layer effectively bonds the separator and electrode, improving the assembly workability of secondary batteries by ensuring sufficient strength and minimizing internal resistance.
Implementation Method 1
an adhesive layer disposed between a separator for a secondary battery and an electrode for a secondary battery
Data Source
AI summary
An adhesive layer disposed between a separator for a secondary battery and an electrode for a secondary battery, wherein the adhesive layer is obtained by bonding under pressure a layer containing a resin having a structural unit derived from an α-olefin having 2 to 4 carbon atoms, and an occupancy area of the resin in the adhesive layer is 10 to 80%.