Electrode Piece Recessed Tab Layer to Limit Cell Thickness Buildup
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Solution Overview
Problem
Conventional lithium-ion batteries face issues with excessive thickness near the electrode tab, leading to reduced safety, poor charging and discharging rate performance, and lithium precipitation.
Innovation Solution
An electrode piece with a current collector and a functional layer, featuring a recessed area near the tab with a thickness less than the normal area, effectively reducing the thickness near the tab and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional electrode piece with uniform thickness is used, then the battery structure is simple and easy to manufacture, but the cell thickness near the tab becomes excessive, leading to lithium precipitation, increased internal resistance, and reduced safety
Solution Approach 1:
The electrode piece employs a non-uniform thickness design where the functional layer thickness varies across different regions. Specifically, the thickness at the tab region is reduced compared to other regions, creating local quality differences that prevent excessive cell thickness near the tab while maintaining adequate thickness in active areas for performance.
2Reliability
If the electrode piece thickness is uniformly reduced, then the cell thickness near the tab is controlled, but the active material capacity in other regions is reduced, affecting battery energy density
Solution Approach 1:
The functional layer is designed with spatially varying thickness where the thickness reduction is localized to the tab region only. The active material layer maintains sufficient thickness in regions away from the tab to preserve capacity, while the tab region has reduced thickness to control cell thickness. This local differentiation resolves the contradiction between thickness control and capacity preservation.
3Ease of operation
If adhesive tape is attached to the tab and surrounding areas, then the tab is securely fixed, but the cell thickness near the tab increases excessively, exceeding standard specifications
Solution Approach 1:
The electrode piece incorporates a reduced thickness zone at the tab region where adhesive tape will be applied. This pre-designed thickness reduction ensures that even after adhesive attachment, the overall cell thickness at the tab location remains within specification limits, while other regions maintain their full thickness for optimal performance.
Data Source
AI summary
Disclosed are an electrode piece and a battery. The electrode piece includes a current collector and a functional layer located on a first surface of the current collector, the first surface is provided with a tab, and the functional layer is composed of a normal area away from the tab and a recessed area near the tab, and a thickness of the recessed area is less than a thickness of the normal area. The present disclosure can effectively prevent problems such as excessive thickness of part of a cell near the tab, thereby improving battery qualities such as safety and charging/discharging rate.