Battery Cell Sealing Portion Width Optimization for Drop Impact Resistance
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Solution Overview
Problem
Consumer electronic cells face safety risks due to drop resistance issues, as the impact from drops can cause the sealed edge of the aluminum-plastic film to break, leading to electrolyte leakage or fire, compromising the cell's safety and performance.
Innovation Solution
A cell design with a housing that includes a sealing portion with varying widths of sealing portions between the sealants and the housing sides, increasing the sealing strength and impact resistance without occupying inner space, thereby reducing the risk of cell failure and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing portion width is increased to improve impact resistance, then the cell safety is improved, but the cell dimensions and energy density are reduced
Solution Approach 1:
The patent applies local quality by creating different sealing portion widths at different locations. The first sealing portion (between the first sealant and first side surface) has a greater width than the second sealing portion (between the first sealant and second sealant), providing enhanced impact resistance at the more vulnerable first sealing portion while maintaining a compact overall structure.
Solution Approach 2:
The patent employs asymmetry by making the sealing portion widths non-uniform. Specifically, the first sealing portion width is designed to be greater than the second sealing portion width, creating an asymmetric sealing structure that optimizes impact resistance where needed while minimizing space consumption.
2Strength
If the sealing portion width is increased to improve impact resistance, then the sealing strength is improved, but the cell dimensions are increased
Solution Approach 1:
The patent applies local quality by creating different sealing portion widths at different locations. The first sealing portion (between the first sealant and first side surface) has a greater width than the second sealing portion (between the first sealant and second sealant), providing enhanced impact resistance at the more vulnerable first sealing portion while maintaining a compact overall structure.
Solution Approach 2:
The patent applies partial action by selectively increasing the sealing portion width only where needed (at the first sealing portion) rather than uniformly increasing all sealing portions. This targeted approach provides sufficient sealing strength improvement without the need to increase the overall cell dimensions.
3Ease of manufacture
If the sealing structure is simplified to reduce manufacturing complexity, then the manufacturing cost is reduced, but the impact resistance is reduced
Solution Approach 1:
The patent applies local quality by creating different sealing portion widths at different locations. The first sealing portion (between the first sealant and first side surface) has a greater width than the second sealing portion (between the first sealant and second sealant), providing enhanced impact resistance at the more vulnerable first sealing portion while maintaining a compact overall structure.
Data Source
AI summary
A cell includes an electrode assembly, a housing, tabs, a first sealant, and a second sealant. The housing includes a housing body and a sealing portion connected to the housing body. The sealing portion is disposed between the first side surface and the second side surface. The tabs protrude from the sealing portion and include a first tab and a second tab. The first sealant is used to sealably connect the first tab and the sealing portion. The second sealant is used to sealably connect the second tab and the sealing portion. The sealing portion between the first sealant and the first side surface is a first sealing portion, and the sealing portion between the first sealant and the second sealant is a second sealing portion. In a length direction of the housing, a width of the first sealing portion is greater than a width of the second sealing portion.