Composite Battery Substrate With Buried Tabs for Low Contact Resistance
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Solution Overview
Problem
Rechargeable lithium batteries face challenges in achieving high energy density and capacity, particularly in ensuring adequate adhesive force and contact resistance between the tab and the composite substrate, which affects the overall performance and efficiency of the battery.
Innovation Solution
A composite substrate is designed with a support layer sandwiched between two metal layers, incorporating buried and exposed tabs to enhance the adhesive force and contact resistance, thereby improving the electrical connection and stability of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the tab is buried between the support layer and metal layer, then adhesive force is improved, but contact resistance increases
Solution Approach 1:
The tab is divided into two distinct portions: a buried portion embedded between the support layer and metal layer to provide adhesive force, and an exposed portion extending outward to ensure low contact resistance for electrical connection. This segmentation allows each portion to fulfill its specific function optimally.
Solution Approach 2:
Different portions of the tab are designed with different characteristics: the buried portion is optimized for adhesion to the support layer and metal layer, while the exposed portion is optimized for electrical contact. This local differentiation of properties resolves the contradiction between adhesive force and contact resistance.
2Reliability
If the tab is exposed on the metal layer surface, then contact resistance is reduced, but adhesive force decreases
Solution Approach 1:
The tab structure is segmented into buried and exposed portions, allowing the exposed portion to provide low contact resistance while the buried portion maintains adhesive force through embedding in the support layer.
Solution Approach 2:
The tab extends in multiple dimensions: vertically embedded in the support layer for adhesion, and horizontally exposed on the surface for electrical contact. This multi-dimensional configuration resolves the trade-off between adhesive force and contact resistance.
Data Source
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AI summary
Disclosed are composite substrates and rechargeable lithium batteries. The composite substrate includes a support layer, a first metal layer on a top surface of the support layer, a second metal layer on a bottom surface of the support layer, and at least one tab that is buried between the support layer and at least one of the first and second metal layers. The tab includes a buried portion and an exposed portion.