Pouch Battery Sealing Structure for Compact Cooling Layout
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Solution Overview
Problem
Existing pouch secondary batteries face challenges in achieving high energy density, reduced volume, and extended lifespan, particularly when exposed to high temperatures, and require improved cooling efficiency.
Innovation Solution
A pouch secondary battery design with a reduced volume casing that seals on three sides and includes an adhesion portion and extending portions, allowing electrode tabs to protrude, made from materials like aluminum or aluminum alloy, and a method of fabrication that forms a concave portion for enhanced cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sealing portion volume is reduced to achieve higher energy density, then the battery volume decreases, but the sealing reliability may deteriorate
Solution Approach 1:
The sealing portion is divided into multiple sealing regions (first sealing region, second sealing region, third sealing region) that seal different sides of the electrode assembly separately. This segmentation allows each sealing region to be optimized independently, maintaining reliable sealing while minimizing overall volume.
Solution Approach 2:
The sealing portions extend in multiple spatial dimensions (length and width directions) to enclose the electrode assembly from different sides. This multi-dimensional sealing approach achieves comprehensive sealing coverage with reduced overall sealing volume compared to traditional single-direction sealing.
2Volume of moving object
If the casing volume is reduced to increase energy density, then the battery occupies less space, but the cooling efficiency may deteriorate
Solution Approach 1:
Cooling plates are arranged in both the length direction and width direction of the battery, creating a multi-dimensional cooling network. This allows efficient heat dissipation from electrode tabs located at different positions, maintaining cooling efficiency while reducing overall casing volume.
Solution Approach 2:
Cooling plates are strategically positioned at specific locations (first cooling plate at first electrode tab location, second cooling plate at second electrode tab location) to provide localized cooling where heat generation is highest, optimizing cooling efficiency within reduced volume.
3Volume of moving object
If the sealing portion is minimized to reduce battery volume, then energy density improves, but the structural complexity increases
Solution Approach 1:
The sealing structure is segmented into distinct sealing portions (first, second, third sealing regions) that can be independently formed and controlled, simplifying the manufacturing process while achieving compact volume.
Solution Approach 2:
The casing includes an adhesion portion that adheres to the electrode assembly, providing flexible sealing accommodation. This allows the sealing structure to adapt to electrode assembly variations without increasing overall complexity or volume.
Data Source
AI summary
A pouch secondary battery is disclosed. One aspect of the present invention provides a pouch secondary battery including a casing configured to accommodate an electrode assembly from which electrode tabs are led; and the casing includes a sealing portion formed on three sides of four sides of the pouch secondary battery and an adhesion portion formed on the remaining one side; and an extending portion protruding perpendicularly with respect to the adhesion portion is formed in a portion adjacent to the adhesion portion in the sealing portion.