Battery Pouch Unit Notch Structure to Suppress Sheet Bending
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The deepening of the accommodation space in pouch sheet batteries leads to increased differences in stretching between layers, causing bending issues during the attachment and sealing process, which complicates the assembly of battery cells.
Innovation Solution
A pouch unit with a notch portion on its inner surface adjacent to the accommodation and gas chamber portions is introduced, which alleviates bending by redistributing forces and improving the structural integrity of the pouch sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the accommodation space in the pouch sheet is deepened to increase energy density, then the energy density is improved, but the pouch sheet experiences increased bending due to differential stretching between layers
Solution Approach 1:
The pouch sheet is segmented into multiple layers with different thicknesses. The first pouch sheet has a first thickness and the second pouch sheet has a second thickness different from the first, allowing each layer to accommodate different degrees of stretching and reducing differential stress between layers during deepening of the accommodation space.
Solution Approach 2:
Different regions of the pouch sheet structure have different thickness properties. The first pouch sheet and second pouch sheet have different thicknesses at corresponding positions, creating local quality variations that allow the structure to better handle the stress distribution when the accommodation space is deepened, preventing bending while maintaining high energy density.
2Quantity of substance
If the accommodation space is deepened to increase energy density, then the energy density is improved, but the attachment and sealing process becomes more difficult
Solution Approach 1:
The pouch sheet is divided into multiple layers with different thicknesses, which reduces differential stretching and bending during the attachment and sealing process. This segmentation allows the sealing process to proceed more easily even when the accommodation space is deepened for higher energy density.
3Device complexity
If a single-layer pouch sheet structure is used, then the structure is simple, but bending occurs when the accommodation space is deepened
Solution Approach 1:
The pouch sheet uses a composite structure consisting of a first pouch sheet and a second pouch sheet with different thicknesses. This composite material approach allows the structure to resist bending when the accommodation space is deepened, while the overall design remains relatively simple with only two layers.
Data Source
AI summary
A pouch unit and a battery cell including the same are disclosed. The pouch unit comprises a pouch sheet having an inner surface and an outer surface opposite the inner surface, an accommodation portion formed on the pouch sheet, the accommodation portion forming an accommodation space that is open in a direction in which the inner surface faces, a perimeter portion formed on the pouch sheet, the perimeter portion being positioned between a perimeter of the pouch sheet and the accommodation portion, and a notch portion formed alongside a side of the accommodation portion at the perimeter portion, the notch portion being concave on the inner surface.