Battery Case Structure for Uniform Electrode Assembly Pressure
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Solution Overview
Problem
Existing secondary batteries face issues with non-uniform pressure distribution on the electrode assembly due to varying gas pressures, leading to accelerated deterioration and reduced lifespan.
Innovation Solution
The secondary battery design incorporates a case with distinct regions of varying material properties and thicknesses to evenly distribute pressure on the electrode assembly, ensuring consistent force application regardless of gas accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the case is made with uniform material properties and thickness, then the manufacturing process is simple, but the pressure distribution on the electrode assembly becomes non-uniform leading to accelerated deterioration
Solution Approach 1:
The case is designed with different material properties or thicknesses in different regions. Specifically, the first region (opposite the vent) has different properties than the second region, allowing the case to compensate for gas pressure accumulation and achieve uniform pressure distribution on the electrode assembly, thereby extending battery lifespan without excessive complexity
Solution Approach 2:
The case is divided into distinct regions (first region and second region) with different characteristics. This segmentation allows each region to serve a specific function: the first region compensates for gas pressure while the second region provides structural support, resolving the contradiction between reliability and complexity
2Stress or pressure
If gas accumulates in the case, then the internal pressure increases, but the pressure distribution becomes non-uniform causing accelerated electrode deterioration
Solution Approach 1:
The case design changes the physical parameters (material properties, thickness) in different regions to compensate for gas accumulation. The first region has specific properties that counteract the harmful effects of gas pressure, transforming the harmful factor into a controllable parameter that maintains uniform pressure distribution
Solution Approach 2:
The design accepts gas accumulation as inevitable but converts its harmful effect into a beneficial outcome by strategically designing the first region to leverage gas pressure for maintaining uniform distribution, thereby protecting the electrode assembly and extending battery life
Data Source
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AI summary
A secondary battery includes an electrode assembly and a case accommodating the electrode assembly, at least a portion of the case including a first region and a second region different from the first region, the second region having a different pressing force on the electrode assembly than the first region.