Battery Sealing Member Elasticity for High-Compression Electrolyte Sealing
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Solution Overview
Problem
Existing sealing members for batteries with non-aqueous electrolytic solutions face challenges in suppressing electrolyte permeation and preventing damage, particularly when attached in a compressed state, leading to potential cracking and reduced battery performance over time.
Innovation Solution
A sealing member with a compression rate of 50% or more, made from an elastic material such as a VdF-based fluoroelastomer, is designed to satisfy the condition Eb≥a×βb, where Eb is the elongation at break, β is the cross-sectional aspect ratio, and a and b are specific constants, to minimize permeation and damage risk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compression rate of the sealing member is increased to suppress electrolyte permeation, then the sealing performance is improved, but the incidence of damage to the sealing member increases
Solution Approach 1:
The patent changes the material parameters of the sealing member by specifying the elongation at break (Eb) and cross-sectional aspect ratio (β) relationship (Eb≥a×βb), where a and b are specific constants. This parameter optimization allows the sealing member to achieve both high sealing performance and damage resistance under compression rates of 50% or more, resolving the contradiction between sealing effectiveness and structural integrity.
2Loss of substance
If the compression rate is increased to improve sealing performance, then electrolyte permeation is suppressed, but the sealing member is more prone to cracking
Solution Approach 1:
The patent optimizes the material parameters by establishing the relationship Eb≥a×βb between elongation at break and cross-sectional aspect ratio. This parameter control enables the sealing member to maintain high resistance to electrolyte permeation while preventing cracking and damage, even when attached at compression rates of 50% or more.
3Reliability
If a high compression rate is used to ensure tight sealing, then leakage is suppressed, but the sealing member durability decreases
Solution Approach 1:
The patent changes and optimizes the material parameters by specifying the relationship between elongation at break (Eb) and cross-sectional aspect ratio (β) as Eb≥a×βb. This parameter optimization allows the sealing member to achieve both effective leakage suppression and extended durability, maintaining performance over the battery's service life even under high compression rates of 50% or more.
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 reduces electrolyte permeation and incidence of damage, ensuring the sealing member's durability and maintaining battery performance over extended periods.
Implementation Method 1
a material constituting the sealing member comprises an elastic material
Data Source
AI summary
A sealing member that exhibits both the effect of suppressing permeation and leakage of an electrolytic solution and the effect of decreasing the incidence of damage to the sealing member is provided. A sealing member for a battery includes a non-aqueous electrolytic solution, where a material constituting the sealing member contains an elastic material. A compression rate R of the sealing member when attached is 50% or more. The sealing member satisfies Eb≥a×βb, where Eb is an elongation at break of the material constituting the sealing member as measured in accordance with JIS K 6251, β is a cross-sectional aspect ratio, a=6.919×R−2.066, and b=2.278×R−1.767.