Multi-Tab Battery Cell Layout for Uniform Current Density
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Solution Overview
Problem
Traditional lithium-ion batteries exhibit high resistance, poor thermal performance, and ununiform current density, which negatively impact safety and durability, particularly in elongate type battery cells with large sizes.
Innovation Solution
The battery cell design incorporates electrodes with multiple tabs in an alternating arrangement, stacked with separators, and connected by a busbar to achieve uniform current density and improved electrical resistance, utilizing a method of forming electrodes through precise coating and cutting processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional elongate electrode structures are used, then the battery cell can achieve large size in length direction, but the electric resistance increases and current density becomes ununiform
Solution Approach 1:
The electrode is divided into multiple segments with tabs distributed along the length direction. Each tab acts as an independent current collection point, segmenting the current flow path and reducing overall electric resistance while maintaining large battery cell length.
2Length of moving object
If traditional electrode structures are used, then the battery cell can achieve large size, but the current density becomes ununiform
Solution Approach 1:
Multiple tabs segment the electrode into distinct current collection zones, distributing current density more uniformly across the electrode surface and preventing localized overheating or performance degradation.
Solution Approach 2:
Tabs are strategically positioned at different locations along the electrode length, creating local current collection points that optimize current density distribution across different regions of the electrode.
3Length of moving object
If traditional electrode structures are used, then the battery cell can achieve large size, but the thermal performance deteriorates
Solution Approach 1:
The segmented tab structure divides the electrode into smaller thermal zones, improving heat dissipation efficiency and preventing thermal runaway propagation across the entire battery cell.
Solution Approach 2:
Tabs are positioned to create localized current collection and heat generation points, allowing for more uniform thermal distribution and improved overall thermal performance across the large battery cell structure.
Data Source
AI summary
A battery cell and a battery cell module and a method of forming batteries with improved electric resistance and uniform current density are provided. The battery cell includes a first and a second negative electrodes and a first and second positive electrodes, each having defined length and width, with multiple tabs extending outward from one side along the width direction. When stacked, the tabs of the first and second negative electrodes are located on the same side in an alternating arrangement, substantially covering the entire electrode length, and the tabs of the first and second positive electrodes are located on the opposite side in an alternating arrangement, substantially covering the entire electrode length. The battery cell further includes busbars with various configurations to ensure effective electrical connections.