Secondary Battery Tab Layout With Single Strip Terminal
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Solution Overview
Problem
Existing secondary battery designs face challenges in maximizing internal space utilization and battery capacity due to the thickness and number of substrate tabs, which affects the efficiency of current flow and energy storage.
Innovation Solution
The design incorporates a configuration where substrate tabs are formed in multiple regions, spaced apart horizontally, and welded to a single strip terminal, reducing the thickness and number of stacked tabs, allowing for increased internal space and improved capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If substrate tabs are formed in multiple regions and welded to a single strip terminal, then internal space utilization is improved and battery capacity increases, but the complexity of electrode assembly manufacturing increases
Solution Approach 1:
The substrate tabs are divided into multiple regions (first substrate tabs and second substrate tabs) that are spatially separated and welded to different locations on the strip terminal. This segmentation allows current to be collected from different areas of the electrode plate, increasing the effective current collection area and thus battery capacity, while the strip terminal integrates these multiple connection points into a single component
Solution Approach 2:
Multiple substrate tabs from different regions are welded to a single strip terminal, merging multiple current collection points into one integrated external connection. This combining approach increases the effective current collection area without increasing the number of external terminals, thereby improving battery capacity while maintaining simple external connectivity
2Volume of moving object
If substrate tabs are spaced apart horizontally in multiple regions, then internal space utilization is improved, but the difficulty of welding and assembly increases
Solution Approach 1:
Instead of stacking substrate tabs vertically (single dimension), the invention distributes them horizontally across multiple regions on the strip terminal (two-dimensional arrangement). This spatial distribution in another dimension reduces the vertical thickness of the tab stack, increasing internal space, while the horizontal arrangement allows for systematic welding patterns that manage assembly complexity
3Quantity of substance
If the number of substrate tabs is increased to improve current flow, then battery capacity increases, but the thickness of the tab stack increases reducing internal space
Solution Approach 1:
The invention transitions from a vertical stacking arrangement (single dimension) to a horizontal distribution arrangement (two dimensions) of substrate tabs. By spreading tabs across multiple regions horizontally on the strip terminal, the vertical thickness of the tab assembly is reduced, freeing up internal space while maintaining an increased total number of tabs for improved current collection and battery capacity
Data Source
AI summary
A secondary battery includes an electrode assembly including a negative electrode plate including a plurality of first negative electrode substrate tabs and a plurality of second negative electrode substrate tabs, a positive electrode plate including a plurality of first positive electrode substrate tabs and a plurality of second positive electrode substrate tabs, and a separator between the negative electrode plate and the positive electrode plate; a pouch accommodating the electrode assembly; a first strip terminal electrically connected to the plurality of first negative electrode substrate tabs and the plurality of second negative electrode substrate tabs; and a second strip terminal electrically connected to the plurality of first positive electrode substrate tabs and the plurality of second positive electrode substrate tabs.