Secondary Battery Pouch Structure for Direct Cooling Contact
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Solution Overview
Problem
The existing pouch-type secondary battery design limits cooling air transfer efficiency due to the double side folding (DSF) part, which prevents direct contact between the cooling member and the accommodation part, hindering effective heat dissipation.
Innovation Solution
A novel pouch structure with two first covers on both surfaces in the thickness direction and two second covers in the full-width direction, where the edge surfaces are sealed by a first sealing part and the end surfaces by a second sealing part, allowing the cooling member to be in close contact with the second covers for enhanced heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a double side folding (DSF) part is used to seal the pouch, then sealing force is improved, but cooling air transfer efficiency deteriorates
Solution Approach 1:
The pouch is divided into multiple sealing parts: a first sealing part that seals edge surfaces of covers, and a second sealing part that seals end surfaces of covers. This segmentation allows the cooling member to contact the pouch body directly while maintaining sealing integrity through distributed sealing structures.
Solution Approach 2:
The DSF part is removed from the pouch structure and replaced with a simplified sealing configuration. The sealing function is extracted and redistributed to specific sealing parts positioned at edge and end surfaces, eliminating the interference with cooling air transfer while preserving sealing capability.
2Reliability
If the DSF part is disposed between the cooling member and the accommodation part, then sealing is improved, but close contact between cooling member and accommodation part deteriorates
Solution Approach 1:
Sealing is applied locally at specific locations (edge surfaces and end surfaces of covers) rather than through a continuous DSF structure. This allows the pouch body to maintain direct contact with the cooling member in the cooling area, ensuring both sealing reliability at critical points and effective thermal contact where needed.
3Ease of manufacture
If the pouch structure is simplified to improve manufacturing, then manufacturing complexity is reduced, but cooling efficiency may deteriorate
Solution Approach 1:
The pouch employs an asymmetric sealing configuration where the first sealing part and second sealing part are positioned at different locations and serve different functions. This asymmetric design simplifies manufacturing compared to symmetric DSF structures while maintaining effective cooling contact through strategic placement of sealing elements.
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
This configuration improves cooling air transfer efficiency by ensuring direct contact between the cooling member and the pouch, effectively reducing the temperature of the electrode assembly and simplifying the manufacturing process.
Implementation Method 1
the two second covers are in close contact with on both the surfaces of the electrode assembly in the full-width direction
Data Source
AI summary
A secondary battery including an electrode assembly and a pouch configured to accommodate the electrode assembly. The pouch includes two first covers provided on both surfaces of the electrode assembly in a thickness direction and two second covers provided on both surfaces of the electrode assembly in a full-width direction. The edge surfaces of the first covers and the second covers are sealed by a first sealing part, and the end surfaces of the first covers and the second covers are sealed by a second sealing part. The two second covers are in close contact with both the surfaces of the electrode assembly in the full-width direction.