Battery Cell Connecting Sheet Structure for Higher Current Flow
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Solution Overview
Problem
The existing pouch battery packs face challenges with limited current transmission areas due to smaller welding regions between connecting sheets and tabs, leading to higher internal resistance and reduced current flow capabilities, which affects the performance and efficiency of the cells.
Innovation Solution
The design incorporates connecting sheets with pole post and tab connecting portions, featuring multiple tab connecting portions to enhance current flow areas, reduce internal resistance, and improve stability by symmetrically arranging welding regions, ensuring balanced force distribution and efficient assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the welding region between connecting sheets and tabs is kept compact, then the assembly is simpler and easier to manufacture, but the current transmission area is limited leading to higher internal resistance
Solution Approach 1:
The connecting sheet is divided into multiple tabs, with each tab having separate welding regions. This segmentation increases the total current transmission area by distributing the current flow across multiple parallel paths, thereby reducing internal resistance while maintaining manageable assembly complexity through modular welding regions
Solution Approach 2:
The connecting sheet extends in multiple spatial dimensions with tabs arranged in different directions. This dimensional expansion increases the effective welding area without proportionally increasing assembly complexity, as the extended structure naturally provides multiple connection points for current transmission
2Reliability
If multiple tab connecting portions are added to increase current flow area, then internal resistance is reduced, but the assembly process becomes more complex
Solution Approach 1:
Multiple tab connecting portions are merged into a single integrated connecting sheet structure. This merging allows the current to flow through multiple parallel paths within one component, reducing internal resistance while simplifying the assembly process by requiring only one connecting sheet installation rather than multiple separate components
Solution Approach 2:
The connecting sheet serves multiple functions simultaneously: it provides electrical connection between tabs and pole posts, acts as a current distribution network with multiple welding regions, and structurally binds the cell components together. This multi-functionality increases current flow capability without adding separate assembly steps
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design increases the current flow area, reduces internal resistance, enhances the current flow capability, improves assembly efficiency, and ensures stable connections, thereby improving the overall performance and reliability of the battery cells.
Implementation Method 1
the pole post is electrically connected to the pole post connecting portion, and one of the plurality of tabs is electrically connected to at least two of the tab connecting portions
Data Source
AI summary
The disclosure provides a cell and a battery pack. The cell includes a housing, a cell unit, and a plurality of connecting sheets; the housing is provided with a pole post; the cell unit is disposed in the housing and provided with a plurality of tabs; and each of the connecting sheets includes a pole post connecting portion and a plurality of tab connecting portions connected to the pole post connecting portion, the pole post is electrically connected to the pole post connecting portion, and one of the plurality of tabs is electrically connected to at least two of the tab connecting portions.