Pouch Cell Connecting Sheet Layout for Higher Current Flow
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Solution Overview
Problem
The existing pouch battery packs have a small welding region between the connecting sheet and tabs, leading to higher internal resistance and reduced current flow, which fails to meet the requirements for efficient charging and discharging.
Innovation Solution
The cell design includes a connecting sheet with a pole post connecting portion and multiple tab connecting portions, allowing each tab to be electrically connected to at least two tab connecting portions, increasing the current flow area and reducing internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional connecting sheet with single tab connection is used, then the structure is simple, but the welding region area is small leading to high internal resistance
Solution Approach 1:
The connecting sheet is segmented into multiple tab connecting portions (first, second, third, fourth portions) instead of a single connection point. Each portion connects to different tabs or positions on the same tab, dividing the current path into multiple parallel channels. This segmentation increases the total welding region area and reduces internal resistance while maintaining structural organization.
Solution Approach 2:
The connecting sheet extends in multiple spatial dimensions with tab connecting portions distributed across different locations and orientations. Rather than a single-plane connection, the design utilizes multi-dimensional arrangement of connection points, increasing the effective welding area and current distribution capacity without proportionally increasing structural complexity.
2Reliability
If the welding region area is increased by using multiple tab connecting portions, then the internal resistance decreases, but the manufacturing complexity increases
Solution Approach 1:
Multiple tab connecting portions are merged into a single integrated connecting sheet structure. Instead of using separate connecting components for each tab connection, the design combines all connection functions into one piece, which simplifies the assembly process by reducing the number of parts to be handled and installed, while still providing multiple welding regions for reduced internal resistance.
3Reliability
If each tab is connected to at least two tab connecting portions, then the current flow area increases, but the welding complexity increases
Solution Approach 1:
Different tab connecting portions are designed with locally optimized characteristics. Each portion can be tailored with appropriate size, shape, and position according to the specific tab it connects to, allowing for optimized welding geometry at each local connection point. This local quality approach ensures reliable current flow distribution while accommodating variations in tab positions and orientations.
Data Source
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AI summary
The disclosure provides a cell (100) and a battery pack. The cell (100) includes a housing (10), a cell unit (20), and a plurality of connecting sheets (30); the housing (10) is provided with a pole post (11); the cell unit (20) is disposed in the housing (10) and provided with a plurality of tabs (21); and each of the connecting sheets (30) includes a pole post connecting portion (31) and a plurality of tab connecting portions (32) connected to the pole post connecting portion (31), the pole post (11) is electrically connected to the pole post connecting portion (31), and one of the plurality of tabs (21) is electrically connected to at least two of the tab connecting portions (32).