Secondary Battery Adhesive Sealing for Low-Volume Airtight Modules
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Solution Overview
Problem
Conventional secondary battery modules using gaskets for assembling cell modules face challenges such as increased volume, difficulty in preventing micro-leakage, thermal strain differences, and weak acid resistance, especially at extreme temperatures.
Innovation Solution
A secondary battery module is developed using an adhesive to replace the gasket, with specific adhesive properties ensuring high adhesion and airtightness, including a peeling force of at least 300 gf/25 mm, viscosity between 100 and 20,000 cps, and pressure resistance up to 0.5 bar positive and -0.5 bar negative, utilizing acrylate-based or epoxy-based adhesives applied to the edges of carbon current collectors and frames.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gasket is used to bond the current collector to the frame, then airtightness is achieved, but the volume of the cell module increases
Solution Approach 1:
The invention extracts the gasket component from the assembly system and replaces it with an adhesive layer. The adhesive is applied directly to the frame or current collector surface, eliminating the need for a separate gasket component, thereby reducing overall volume while maintaining sealing function.
Solution Approach 2:
The adhesive combines multiple functions into a single material layer: bonding the current collector to the frame while simultaneously providing airtightness. This merging of bonding and sealing functions eliminates the need for separate gasket components and reduces assembly complexity.
2Reliability
If a gasket is used to ensure airtightness, then sealing is achieved, but micro-leakage due to scratches on the frame surface cannot be prevented
Solution Approach 1:
The adhesive provides localized compensation for surface defects. By applying the adhesive in a layer that covers the entire bonding interface, it fills in scratches and irregularities on the frame surface, creating a uniform sealing layer that prevents micro-leakage at defect locations.
Solution Approach 2:
The adhesive layer acts as a pre-applied cushioning layer that compensates for potential micro-leakage paths caused by surface scratches. The adhesive's viscoelastic properties allow it to conform to and seal over surface irregularities before operational stresses are applied.
3Strength
If a gasket is used to bond components, then assembly is achieved, but high pressure of 7,000N or higher is required
Solution Approach 1:
The invention replaces the mechanical gasket system that requires high compression forces with a chemical adhesive bonding system. The adhesive creates molecular-level bonds between the frame and current collector, eliminating the need for high mechanical assembly pressures while achieving equivalent or superior bonding strength.
Solution Approach 2:
The adhesive's chemical and physical parameters (adhesive strength, viscosity, curing characteristics) are optimized to achieve strong bonding without requiring high assembly forces. The adhesive formulation allows bonding at significantly lower pressures compared to gasket systems.
4Reliability
If a rubber resin gasket is used, then airtightness is achieved, but thermal strain differences with plastic frame cause airtightness loss at extreme temperatures
Solution Approach 1:
The adhesive is selected or formulated to have thermal expansion characteristics that match the plastic frame material. This homogeneity in thermal behavior ensures that the adhesive layer maintains its sealing integrity across a wide temperature range, preventing airtightness loss that occurs with rubber-gasket/plastic-frame combinations.
5Reliability
If a rubber resin gasket is used, then initial airtightness is achieved, but acid resistance is weak in acidic electrolyte solution
Solution Approach 1:
The adhesive material is selected or formulated with chemical resistance properties suitable for acidic environments. By changing the material composition from rubber resin to an adhesive with superior acid resistance, the sealing maintains its integrity when exposed to acidic electrolyte solutions.
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 solution reduces module volume, eliminates high-pressure assembly processes, maintains stable airtightness across temperatures, and enhances assembly efficiency by preventing micro-leakage and thermal strain issues.
Implementation Method 1
the first current collector and the frame are fixed to each other via a first adhesive member, wherein the second current collector and the frame are fixed to each other via a second adhesive member
Data Source
AI summary
Disclosed is an adhesive for a secondary battery: More specifically, disclosed is an adhesive for a secondary battery that replaces a gasket used when assembling a cell module of the secondary battery.