Pouch Battery Corner Indent Geometry for Capacity and Sealing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Pouch-type secondary batteries face a reduction in battery capacity due to the area occupied by the sealing portion, which limits their size and performance, especially when integrated into battery modules.
Innovation Solution
The design incorporates an indent portion with angled and rounded cutting edges in the sealing portion of the pouch-type secondary battery, allowing for increased capacity by optimizing the space usage and preventing folding or cracking, which includes a first cutting edge inclined at 10° to 50° and a second cutting edge at 5° to 15°, with a rounded edge radius of 2 mm to 8 mm, to accommodate the lead tab portion effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealing portion is made larger to ensure proper sealing and protection, then the reliability and protection of battery components is improved, but the battery capacity is reduced due to less internal space available
Solution Approach 1:
The sealing portion is divided into multiple functional zones: a first sealing region with a first sealing structure for primary sealing, and a second sealing region with a second sealing structure for secondary sealing. This segmentation allows each region to be optimized independently, ensuring reliable sealing while minimizing the overall space occupied by the sealing portion.
Solution Approach 2:
The sealing structures extend in multiple dimensions: the first sealing structure extends in a first direction from the edge of the accommodating portion, while the second sealing structure extends in a second direction (different from the first direction) from the edge. This multi-dimensional arrangement provides comprehensive sealing coverage without requiring a uniformly large sealing area, thus preserving battery capacity.
2Quantity of substance
If the sealing portion is made smaller to increase battery capacity, then the battery capacity is improved, but the reliability of sealing and protection deteriorates
Solution Approach 1:
The sealing portion is divided into multiple functional zones: a first sealing region with a first sealing structure for primary sealing, and a second sealing region with a second sealing structure for secondary sealing. This segmentation allows each region to be optimized independently, ensuring reliable sealing while minimizing the overall space occupied by the sealing portion.
Solution Approach 2:
The sealing structures extend in multiple dimensions: the first sealing structure extends in a first direction from the edge of the accommodating portion, while the second sealing structure extends in a second direction (different from the first direction) from the edge. This multi-dimensional arrangement provides comprehensive sealing coverage without requiring a uniformly large sealing area, thus preserving battery capacity.
3Quantity of substance
If the lead tab portion is positioned closer to the edge to maximize internal space, then the battery capacity is improved, but the sealing portion may be caught by protrusions in the housing causing reliability issues
Solution Approach 1:
The first and second sealing structures are formed in advance during the battery assembly process, creating a pre-formed sealing barrier before the battery is installed in the housing. This preliminary sealing structure prevents the lead tab portion from being caught by protrusions in the housing, ensuring reliable operation while allowing the lead tab to be positioned optimally for maximizing internal space and battery capacity.
Data Source
AI summary
A pouch-type secondary battery includes an electrode assembly; and a pouch member comprising an accommodating portion configured to accommodate the electrode assembly therein, a sealing portion formed at an edge of the accommodating portion, and an indent portion formed of a cutting edge cut at a plurality of angles and a rounded edge cut to connect the cutting edges adjacent to each other in a portion of the sealing portion corresponding to a vertex of the accommodating portion.