Electrode Tab Welding Structure With a Thinned Region
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Solution Overview
Problem
The reliability of connections between electrode tabs and terminals in batteries decreases with increasing tab thickness, leading to poor welding, reduced production efficiency, and yield due to higher welding power requirements and increased cold joint possibilities.
Innovation Solution
An electrode assembly with a welding portion that includes a thinned region, where the sub electrode tabs are welded to form a reliable connection, and a recessed thinned region is used to enhance the electrical connection between the electrode tab and terminal, reducing the risk of cold joints and improving manufacturing ease.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electrode tab thickness is increased to enhance current conveyance capacity, then current conveyance capacity is improved, but welding reliability deteriorates due to higher welding power requirements and increased cold joint possibilities
Solution Approach 1:
The electrode tab structure implements local quality by creating a thinned region at the welding portion while maintaining greater thickness in other areas. This allows the welding area to have optimized thickness for reliable connection, while other regions maintain sufficient thickness for current conveyance capacity.
Solution Approach 2:
The electrode tab is segmented into different regions with different thickness characteristics - a thinned region at the welding portion and thicker regions elsewhere. This segmentation allows each region to be optimized for its specific function: welding reliability at the connection point and current conveyance in the main body.
2Power
If electrode tab thickness is increased to enhance current conveyance capacity, then current conveyance capacity is improved, but production efficiency and yield deteriorate due to poor welding and cold joints
Solution Approach 1:
By creating a thinned region specifically at the welding portion, the invention enables reliable welding with standard welding parameters, eliminating the need for increased welding power that would reduce production efficiency. The localized thickness modification ensures high yield without compromising overall current conveyance capacity.
3Power
If electrode tab thickness is increased to enhance current conveyance capacity, then current conveyance capacity is improved, but connection reliability deteriorates due to higher risk of cold joints
Solution Approach 1:
The thinned region at the welding portion creates optimal conditions for reliable electrical connection by providing appropriate thickness for welding penetration and bond strength, thereby eliminating cold joints. The thicker regions elsewhere maintain the necessary current conveyance capacity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the reliability and efficiency of electrical connections, reducing the risk of cold joints and improving production yield by ensuring strong and consistent welding between electrode tabs and terminals, thereby increasing battery energy density and production efficiency.
Implementation Method 1
The plurality of sub electrode tabs are connected by welding and form a welding portion
Implementation Method 2
the welding portion includes a thinned region, and a thickness of the thinned region is less than a maximum thickness of the welding portion
Implementation Method 3
the thinned region is configured to be recessed relative to at least one surface of the welding portion and form at least one recess
Data Source
AI summary
The application provides an electrode assembly, a battery cell, a battery and an electric device. The electrode assembly includes a main body and at least one electrode tab. The electrode tab includes a plurality of sub electrode tabs extending from an end of the main body and arranged in stacked layers. The plurality of sub electrode tabs are connected by welding and forming a welding portion. The welding portion includes a thinned region. A thickness of the thinned region is less than a maximum thickness of the welding portion. The production efficiency and yield of batteries can be enhanced.