Folded Sealing Part for Pouch Battery Volume Reduction
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Solution Overview
Problem
Pouch type secondary batteries face challenges in reducing the size of their sealing parts to enhance energy density and minimize device volume, as existing designs often result in larger battery modules and packs due to the width of the sealing part.
Innovation Solution
The sealing part of the pouch type secondary battery is folded downwardly at a 90-degree angle and adhered to the side surface, with its width equal to or less than the thickness of the battery, allowing for reduced size and improved energy density by minimizing the occupied space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of the sealing part is increased to ensure safety against swelling and gas, then reliability is improved, but the volume of the battery and device is increased
Solution Approach 1:
The sealing part is folded downwardly at a 90-degree angle from the surface of the pouch type exterior member, transforming the sealing structure from a planar configuration to a three-dimensional folded configuration. This dimensional change allows the sealing part to maintain its functional width for safety while reducing the projected area occupied on the battery surface, thereby decreasing the overall battery volume without compromising reliability.
2Volume of stationary object
If the width of the sealing part is reduced to decrease battery volume, then volume is reduced, but safety against swelling and gas may be compromised
Solution Approach 1:
By folding the sealing part downwardly at 90 degrees, the invention maintains the full width of the sealing part for safety functionality while reducing its footprint on the battery surface. The folded structure provides the necessary sealing capacity against swelling and gas without increasing the battery's external dimensions.
Data Source
AI summary
There is provided a secondary battery including an electrode assembly having a stack structure of an anode/a separation film/a cathode, a pouch type exterior member configured of a lower surface in which a receiving part is formed and an upper surface covering the receiving part, a single electrode assembly or a plurality of electrode assemblies being received in the receiving part, and an electrode terminal formed outwardly of the pouch type exterior member, the secondary battery including: a sealing part formed by bonding edges of the pouch type exterior member, wherein a portion of the sealing part formed on a surface of the pouch type exterior member on which the electrode terminal is not formed outwardly of the exterior member is folded downwardly at an angle of 90 degrees.