Power Storage Device with Weak Outer Layers for Internal Pressure Management
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Solution Overview
Problem
Conventional power storage devices face reliability issues due to internal pressure increases during reflow or use, which can lead to damage of the laminated body, compromising the device's functionality.
Innovation Solution
A power storage device design featuring a function unit with a laminated body of internal electrodes and a separator, where a portion of lower mechanical strength is formed in the outermost layers or as hollow portions, allowing preferential damage to these areas rather than the main laminated body with internal electrodes, thus maintaining the device's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the laminated body is made with uniform high mechanical strength throughout, then the structural integrity is improved, but the reliability deteriorates when gas is produced and internal pressure rises during reflow or use
Solution Approach 1:
The patent applies local quality by creating a weak portion with lower mechanical strength at specific locations (outermost layers or hollow portions) of the function unit, while the rest of the laminated body maintains high mechanical strength. This localized variation in strength allows the weak portion to preferentially absorb expansion stress from gas production, protecting the critical internal electrodes and separator from damage.
2Stability of the object's composition
If the mechanical strength is uniformly distributed, then the structural stability is improved, but the ability to withstand internal pressure without damage deteriorates
Solution Approach 1:
The patent converts the harmful effect of internal pressure expansion into a beneficial protective mechanism. The weak portion is designed to preferentially damage or deform under internal pressure, thereby absorbing the expansion stress and protecting the critical functional components (internal electrodes and separator) from damage. The harmful pressure that could damage the device is instead channeled to damage a non-critical weak portion.
Data Source
AI summary
A power storage device having a laminated body and a portion of lower mechanical strength than the laminated body.