Electrode Tab Welding Thickness Control for Battery Resistance
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Solution Overview
Problem
The excessive welding thickness in electrode tab structures leads to increased welding resistance, affecting the performance of both the electrode tab and the overall battery, causing defects such as deformation and reduced reliability.
Innovation Solution
The electrode tab structure is designed with a welding thickness limited to no more than 1.5 times the sum of the electrode tab substrate and current collector thickness, with specific constraints on welding area, spot density, and layout to optimize the welding process, ensuring suitable thickness and reducing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the welding thickness is increased to ensure sufficient connection between electrode tab substrate and current collector, then the connection strength is improved, but the welding resistance increases which deteriorates battery performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the welding thickness parameter within a specific range (0.5-1.5 times the sum of substrate and current collector thickness). This quantitative parameter optimization resolves the contradiction by finding the optimal thickness value that provides sufficient mechanical strength while minimizing welding resistance to maintain battery performance.
2Reliability
If the welding thickness is reduced to decrease welding resistance, then the battery performance is improved, but the connection strength may be insufficient
Solution Approach 1:
The patent establishes a minimum threshold for welding thickness (0.5 times the sum of substrate and current collector thickness) to ensure adequate connection strength. This parameter boundary definition resolves the contradiction by preventing excessive thinning while allowing sufficient reduction to minimize welding resistance and improve battery performance.
Solution Approach 2:
The patent references and adopts established thickness ratio parameters from prior welding standards and industry practices. By copying proven parameter relationships (0.5-1.5 times ratio), the invention ensures both connection strength and performance optimization without requiring extensive new experimentation.
3Strength
If the welding area is increased to improve connection reliability, then the mechanical strength is enhanced, but the welding resistance increases due to larger contact area
Solution Approach 1:
The patent applies local quality by creating multiple localized welding spots rather than a single large weld area. Each welding spot concentrates the connection function in specific locations, providing sufficient mechanical strength through distributed bonding points while minimizing overall welding resistance by reducing the total contact area between electrode tab substrate and current collector.
Data Source
AI summary
The present application provides an electrode tab structure and a battery, the electrode tab structure includes: an electrode tab substrate; a current collector connected with the electrode tab substrate, a largest thickness after the electrode tab substrate being welded with the current collector is less than or equal to 1.5 times of a sum of a thickness of the electrode tab substrate and a thickness of the current collector. In the present application, the thickness of the electrode tab structure is suitably limited with respect to the sum of the thickness of the electrode tab substrate and the current collector, which avoids defect of too large welding resistance caused by too large thickness of the electrode tab structure, so as to improve internal symmetry of the cell, increase the reliability of the electrode tab structure, and avoid from deforming, which thereby improving the overall performance of the battery.