Pouch Battery Sealing Structure for Double-Sided Cooling
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Solution Overview
Problem
Existing pouch-type secondary batteries face limitations in achieving high-energy density and efficient cooling, particularly due to manufacturing methods and one-sided cooling structures that compromise safety and spacing between electrode assemblies.
Innovation Solution
A pouch-type secondary battery design featuring a sealing portion with a horizontal and inclined protrusion configuration that allows for double-sided cooling, reducing unnecessary features that degrade energy density and ensuring sufficient spacing for electrode assembly connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-sided cooling is used, then the cooling structure is simplified, but the energy density and cooling performance are insufficient
Solution Approach 1:
The cooling structure is divided into two separate cooling plates (first cooling plate and second cooling plate) that contact opposite sides of the electrode assembly. This segmentation allows independent cooling channels on each side, enabling effective double-sided cooling while maintaining structural simplicity through modular design.
Solution Approach 2:
The cooling approach transitions from one-sided (single dimension) to double-sided (two dimensions) cooling by adding cooling capability on both sides of the electrode assembly. This dimensional expansion significantly improves heat dissipation efficiency without proportionally increasing structural complexity.
2Ease of manufacture
If lead tap is offset to one side, then manufacturing is simplified, but spacing distance between electrode assemblies is insufficient
Solution Approach 1:
The lead tap is intentionally positioned asymmetrically (offset to one side) rather than at the center. This asymmetric configuration simplifies the manufacturing process by eliminating the need for precise centering while the horizontal protrusion provides compensatory spacing functionality.
Solution Approach 2:
The horizontal protrusion acts as an intermediary element between the lead tap and the opposing electrode assembly. It provides the necessary spacing distance and physical separation, compensating for the offset position of the lead tap and ensuring adequate clearance for bonding processes.
3Ease of manufacture
If unnecessary features are retained, then manufacturing process is simpler, but energy density is degraded
Solution Approach 1:
The horizontal protrusion is extracted as a separate functional element from the traditional pouch sealing structure. By isolating this spacing-providing feature, the design eliminates unnecessary material in other areas, allowing for more efficient space utilization and higher energy density while maintaining manufacturing simplicity.
Data Source
AI summary
A pouch-type secondary battery includes an electrode assembly, and a pouch member in which the electrode assembly is accommodated and a sealing portion is formed on an edge of the pouch member, where the sealing portion protruding on one side surface extends in a diagonal direction towards the other side surface adjacent to the at least one side surface.