Wound Electrode Assembly With Same-End Tabs for Lower Resistance
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Solution Overview
Problem
Existing battery technologies face issues with internal resistance and heat dissipation due to housing resistance and heat generation, which affect battery performance and fast-charging capabilities.
Innovation Solution
The electrode assembly design features positive and negative electrode tabs located on the same side of the winding structure, with increased lengths along the winding direction, allowing for overlapping and neat arrangement, reducing internal resistance and improving heat dissipation by eliminating the need for housing conductivity and enhancing tab separation and welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If tabs extend from two ends of the winding structure, then current collection is achieved, but housing resistance increases and heat dissipation deteriorates
Solution Approach 1:
Instead of extending tabs from both ends of the winding structure as in conventional designs, this patent inverts the approach by having all tabs (positive and negative) extend from the same end of the winding structure. This eliminates the need for current to pass through the housing, thereby eliminating housing resistance and improving heat dissipation while maintaining effective current collection.
2Temperature
If tab lengths are increased along winding direction, then heat dissipation improves, but tab arrangement complexity increases
Solution Approach 1:
The patent applies local quality by varying the tab lengths along the winding direction according to the specific requirements of each winding layer. Tabs connected to different winding layers have different lengths, with inner layers having shorter tabs and outer layers having longer tabs. This localized differentiation optimizes heat dissipation for each layer while maintaining neat arrangement and avoiding excessive complexity.
3Productivity
If multiple tabs are placed at same end, then current collection efficiency improves, but tab separation difficulty increases
Solution Approach 1:
The patent segments the tabs by connecting them to different winding layers at the same end of the winding structure. Positive tabs and negative tabs are separately connected to positive and negative electrode plates respectively, and tabs from different layers are spaced apart along the winding direction. This segmentation approach improves current collection efficiency while maintaining ease of separation and welding during manufacturing.
Data Source
AI summary
An electrode assembly includes a body portion, including positive and negative electrode plates and a separator plate wound into a winding structure along a winding direction; multiple positive electrode tabs separately connected to at least two positive electrode plate winding layers and spaced apart along the winding direction; and multiple negative electrode tabs separately connected to at least two negative electrode plate winding layers and spaced apart along the winding direction. The multiple positive electrode tabs and the multiple negative electrode tabs are located at a same end portion of the body portion in a direction perpendicular to the winding direction, and a length of the positive electrode tabs connected to the respective positive electrode plate winding layers in the winding direction and a length of the negative electrode tabs connected to the respective negative electrode plate winding layers in the winding direction both increase along the winding direction.