Pouch Battery Sealing Layout to Prevent Gas-Induced Cracks
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Solution Overview
Problem
Pouch-type secondary batteries experience deformation, cracks, and wrinkles due to increased internal pressure from gases produced during charging and discharging, leading to insulation and sealing performance degradation.
Innovation Solution
A manufacturing method involving a first sealing step to form an edge sealing portion, a degassing step to vent collected gases, and a second sealing step to create a division sealing portion, with an additional sealing portion extended between the accommodation and collection portions, spaced apart from the division sealing portion to enhance mechanical rigidity and prevent overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sealing portions are formed to prevent deformation and cracks, then sealing performance is improved, but overlap between sealing portions occurs which degrades sealing performance
Solution Approach 1:
The sealing structure is divided into multiple distinct sealing portions (first sealing portion at the edge, second sealing portion at the corner, third sealing portion along the side) that are spatially separated and do not overlap. Each sealing portion serves a specific function in preventing deformation and cracks in different regions of the pouch-type outer packaging.
Solution Approach 2:
Different sealing portions are strategically positioned at different locations (edge, corner, side) of the pouch-type outer packaging to address local deformation and cracking issues in specific regions. The sealing portions have different orientations and positions tailored to the local structural requirements of each area.
2Strength
If sealing portions are formed to increase mechanical rigidity, then deformation and cracks are prevented, but the complexity of the sealing structure increases
Solution Approach 1:
The sealing structure is segmented into multiple sealing portions positioned at different locations and orientations. This segmentation allows each sealing portion to independently contribute to mechanical rigidity in its specific region, preventing deformation and cracks without requiring a single complex sealing structure.
Solution Approach 2:
The sealing portions are arranged in different spatial dimensions and orientations (edge sealing, corner sealing, side sealing) rather than stacking multiple seals in the same location. This multi-dimensional arrangement increases mechanical rigidity throughout the pouch structure without creating overlapping complexity.
Data Source
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AI summary
A method for manufacturing a secondary battery according to an embodiment of the present disclosure may include a first sealing step of sealing an edge of a pouch-type outer packaging by forming an edge sealing portion at the edge of the pouch-type outer packaging having an accommodation portion for accommodating an electrode assembly and a collection portion for collecting gases produced during charging and discharging of the electrode assembly, a degassing step of venting the gases collected in the collection portion during the charging and discharging of the electrode assembly to outside of the pouch-type outer packaging, and a second sealing step of forming a division sealing portion between the accommodation portion and the collection portion in the pouch-type outer packaging to divide the accommodation portion from the collection portion after the degassing step, wherein the first sealing step may further include forming an additional sealing portion extended from the edge sealing portion in a direction that runs between the accommodation portion and the collection portion, wherein the additional sealing portion may be disposed in the collection portion, spaced apart from the division sealing portion.