Crosslinked Electrode Adhesive for Wear-Resistant Battery Insulation
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Solution Overview
Problem
Secondary ion batteries face issues such as short-circuiting due to metal particle punctures and tab bending, which are caused by insufficient wear resistance and laser cutting of conventional insulating adhesive layers at the edge of positive electrode plates.
Innovation Solution
An adhesive composition comprising structural units A, B, C, and D, forming a three-dimensional crosslinked network with acrylic monomers, enhancing wear resistance and flexibility to prevent short circuits and metal particle splashes, and including insulating fillers to reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional insulating adhesive layer is used at the edge of the positive electrode plate, then it provides basic insulation, but it has poor wear resistance and is easily damaged by laser cutting
Solution Approach 1:
The patent uses a composite adhesive material containing acrylic resin as the base polymer, rubber particles for flexibility and wear resistance, and metal particles for enhanced mechanical strength. This composite formulation simultaneously achieves good insulation, wear resistance, and laser cutting resistance without compromising the adhesive's insulating properties.
Solution Approach 2:
The patent modifies the adhesive composition by incorporating specific ratios of rubber particles (5-20 parts by weight) and metal particles (5-20 parts by weight) relative to the acrylic resin (100 parts by weight). These parameter changes in material composition transform the adhesive from a conventional weak insulating layer to a robust protective layer with enhanced wear and laser resistance while maintaining insulation.
2Strength
If the insulating adhesive layer is made thicker to improve wear resistance, then protection is enhanced, but the flexibility and adhesive force to the current collector deteriorate
Solution Approach 1:
The incorporation of rubber particles into the acrylic resin matrix provides flexibility and elastic recovery, while metal particles enhance mechanical strength. This composite structure allows the adhesive layer to maintain both wear resistance and flexibility, enabling it to accommodate tab bending without losing adhesive force to the current collector.
Solution Approach 2:
The adhesive composition is designed with different components serving localized functions: acrylic resin provides the insulating matrix, rubber particles provide flexibility and shock absorption, and metal particles provide structural reinforcement. This local quality distribution within the composite material allows simultaneous achievement of wear resistance and flexibility without requiring increased thickness.
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 composition effectively isolates tab and electrode plate contact, prevents laser cutting damage, and mitigates metal particle splashes, improving safety and durability of secondary ion batteries.
Implementation Method 1
the structural unit A and the structural unit D form a three-dimensional crosslinked network through hydrogen bond interactions
Implementation Method 2
the structural unit B is provided by an acrylonitrile monomer, where the monomer is a hard monomer that can enhance the strength of an insulating adhesive layer
Implementation Method 3
the structural units A, C, and D are all acrylic monomers, where acrylic substances have high temperature resistance and are not easily decomposed
Data Source
AI summary
An adhesion substance is provided, along with an adhesive composition, a positive electrode plate, a secondary battery, and an electric apparatus. The adhesion substance includes an adhesive comprising structural units A, B, C, and D. Structural unit A has formula (1) and is at least partially crosslinked with structural unit D, which is selected from formula (9). Structural unit B is selected from formulas (2) (6), and structural unit C is selected from formula (7) or (8), where m2 and m2 are integers from 1 to 20. Each structural unit is independently defined, and specific crosslinking between A and D enhances adhesion performance. The adhesive composition may be used in electrochemical devices to improve bonding and durability.