Wound Battery Cell Tab Layout for Uniform Thickness
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Solution Overview
Problem
Battery cells face challenges in increasing energy density and safety performance due to the protrusion of electrode tabs, which leads to increased thickness and potential lithium precipitation from uneven local stresses.
Innovation Solution
The battery cell design incorporates a wound electrode assembly with a tab structure where the tab protrudes from the electrode plate in a specific direction, avoiding overlap with the winding terminating section, allowing for efficient use of space and reducing thickness differences, thereby enhancing energy density and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the tab protrudes from the electrode plate surface in the straight region, then the volumetric energy density is improved, but the thickness uniformity deteriorates
Solution Approach 1:
The tab is positioned in the straight region and arranged in a specific direction such that when viewed in the second direction (thickness direction), the tab and winding terminating section do not overlap. This spatial arrangement in multiple dimensions allows the tab to protrude and utilize empty space without increasing the overall thickness of the battery cell, thereby improving volumetric energy density while maintaining thickness uniformity.
2Volume of moving object
If the tab is positioned in the straight region, then the space utilization is improved, but the local stress uniformity deteriorates
Solution Approach 1:
The tab is specifically positioned in the straight region where the electrode assembly has more uniform structural properties. This location provides better mechanical support and more uniform stress distribution compared to other regions, allowing the tab to utilize empty space effectively while maintaining local stress uniformity and preventing lithium precipitation.
3Shape
If the tab and winding terminating section overlap when viewed in the second direction, then the structural compactness is improved, but the energy density deteriorates
Solution Approach 1:
Instead of arranging the tab to overlap with the winding terminating section in the planar view (first direction), the invention positions the tab in the straight region and controls its orientation such that in the thickness direction (second direction), their projections do not overlap. This dimensional arrangement allows both components to coexist without interfering with each other, maximizing space utilization and energy density while maintaining structural integrity.
Data Source
AI summary
An electrode assembly of a battery cell includes a first electrode plate and a first tab. The first tab is electrically connected to the first electrode plate. The first tab is located in a straight region. The first tab at least partially protrudes from a surface of the first electrode plate in a second direction. The first electrode plate includes a first winding terminating section located in the straight region and a first bending section located in a bending region. One end of the first winding terminating section is connected to the first bending section, and another end of the first winding terminating section is a first winding terminating end of the first electrode plate. When viewed in the second direction, the first tab and the first winding terminating section do not overlap.