Split Electrode Tabs for Easier Bending in Battery Cells
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Solution Overview
Problem
The reliability of battery cells is compromised due to the difficulty in bending the tab bundles under pressure, which can lead to excessive deformation and increased gaps between the layers of the electrode assembly, affecting lithium ion migration and overall cell reliability.
Innovation Solution
The electrode plate design includes a current collector with tabs that are split into sub-tabs with a gap between them, weakening the bending strength and reducing the difficulty of bending, thereby minimizing the risk of excessive deformation and improving the reliability of the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tab is made as a single solid piece, then the structural strength is high, but the bending difficulty increases and excessive deformation occurs
Solution Approach 1:
The tab is divided into multiple sub-tabs (first sub-tab and second sub-tab) with a gap between them. This segmentation reduces the bending strength of the tab while maintaining its structural integrity, allowing the tab to bend more easily under pressure without causing excessive deformation to the main body.
2Ease of operation
If external force is applied to bend the tab, then the bending is achieved, but excessive force causes deformation of the main body
Solution Approach 1:
By dividing the tab into sub-tabs with gaps, the bending force is distributed across multiple smaller segments rather than concentrating stress on a single solid tab. This reduces the risk of excessive force being transmitted to the main body, preventing deformation while still achieving the necessary bending.
3Strength
If the tab bending strength is high, then the structural integrity is maintained, but the difficulty of bending under pressure increases
Solution Approach 1:
The tab structure is segmented into sub-tabs with gaps, which reduces the overall bending strength to a level that allows easy bending under pressure. The segmentation creates natural flex points that facilitate the bending process while maintaining sufficient structural integrity for the tab's functional requirements.
Data Source
AI summary
This application discloses an electrode plate, a battery cell, an electrode assembly, a battery, and an electrical device, and relates to the field of battery technology. The electrode plate includes a current collector. The current collector includes a main body and a plurality of tabs. The main body includes a first edge in a width direction of the main body. The tabs protrude from the first edge. The plurality of tabs are spaced apart along a length direction of the main body. The plurality of tabs include at least one first tab. The first tab includes a first sub-tab and a second sub-tab. A gap exists between the first sub-tab and the second sub-tab.