Pouch Case Structure to Eliminate Shark Fin Cooling Interference
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Solution Overview
Problem
Conventional pouch-type secondary batteries experience interference and reduced cooling efficiency due to shark fin protrusions on the planar side, which restricts design flexibility and affects the stacking and cooling of secondary batteries.
Innovation Solution
A pouch case design with forming portions for each end surface of the electrode assembly, notch portions to control protrusions, and a storing portion to cover the sides, ensuring intimate contact and preventing structural separation, thereby optimizing space and cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sealing is performed on all sides of the pouch case including the planar side, then the electrode assembly is fully enclosed and protected, but shark fin protrusions are formed that interfere with cooling plate contact and reduce cooling efficiency
Solution Approach 1:
The harmful sealing portion (planar side sealing) is extracted and removed from the pouch case structure. The patent specifically eliminates sealing on the planar side to prevent shark fin protrusion formation, while maintaining sealing on the essential sides to preserve electrode assembly enclosure and protection.
Solution Approach 2:
The patent converts the potential harm of incomplete sealing (which might seem like a defect) into a benefit by deliberately leaving the planar side unsealed. This prevents shark fin formation and enables direct contact between the pouch case and cooling plate, transforming what could be seen as a sealing deficiency into a cooling enhancement feature.
2Stability of the object's composition
If conventional sealing methods are used on the planar side, then complete enclosure is achieved, but design flexibility is restricted and stacking freedom is reduced
Solution Approach 1:
The restrictive planar side sealing is extracted and removed from the pouch case design. This elimination of sealing on the planar side releases the constraints on design flexibility and stacking arrangements, allowing for optimized module configurations without compromising essential enclosure functionality.
3Reliability
If shark fin protrusions are present on the pouch case, then complete sealing is achieved, but interference with cooling plate contact occurs and cooling efficiency is reduced
Solution Approach 1:
The shark fin protrusions are extracted and eliminated by removing the planar side sealing that causes them. This allows the pouch case surface to remain flat and in direct contact with the cooling plate, eliminating interference while maintaining sealing completeness on the essential sides through alternative sealing configurations.
Data Source
AI summary
A pouch case is provided which includes: a forming portion having a predetermined depth, and allowing each of a first end surface and a second end surface of the electrode assembly to be received therein; a notch portion extending from each of opposite ends of the forming portion so as to have a depth gradually decreasing from a depth defined by the thickness of the electrode assembly received in the forming portion; and a storing portion covering a remaining portion other than a portion of the electrode assembly received in the forming portion. By effectively controlling a protruding structure of the pouch case sealed on the first and second end surfaces of the electrode assembly received therein, it is possible to improve contact reliability between the stacked battery cells.