Electrode Tab Layout for Uniform Heat in Secondary Batteries
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Solution Overview
Problem
Secondary batteries experience localized deterioration due to internal heat generation, which is not effectively addressed by existing technologies.
Innovation Solution
The electrode assembly design includes negative and positive electrode tabs that are bent in opposite directions, with multiple tabs spaced apart to facilitate better heat dissipation and equalize deterioration, and is integrated into a secondary battery and battery pack configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode tabs are arranged in a conventional configuration, then the battery structure is simple, but localized heat generation causes uneven deterioration
Solution Approach 1:
The electrode assembly is divided into multiple segments with separate negative electrode tabs and positive electrode tabs that are spatially distributed. This segmentation allows different regions of the battery to be independently managed thermally and electrically, preventing localized heat accumulation and ensuring uniform current distribution across the electrode assembly.
Solution Approach 2:
The negative electrode tabs and positive electrode tabs are configured in asymmetric positions relative to each other, with tabs extending from opposite sides of the electrode assembly. This asymmetric arrangement creates balanced current pathways and heat distribution patterns, eliminating the symmetry-induced hot spots that occur in conventional configurations.
2Temperature
If electrode tabs are bent in opposite directions, then heat distribution is equalized, but manufacturing complexity increases
Solution Approach 1:
The electrode tabs are pre-bent in opposite directions during the electrode assembly manufacturing process, before the battery is sealed and filled with electrolyte. This preliminary action ensures that the tabs are already positioned to create optimal heat distribution pathways, eliminating the need for post-assembly adjustments and simplifying the overall manufacturing workflow.
Solution Approach 2:
The bending direction and curvature radius of the electrode tabs are carefully controlled as manufacturing parameters. By optimizing these parameters, the tabs create extended heat dissipation pathways and balanced current distribution, achieving uniform temperature distribution while maintaining compatibility with standard manufacturing equipment and processes.
3Reliability
If multiple electrode tabs are spaced apart, then deterioration is equalized, but device volume increases
Solution Approach 1:
Instead of spacing tabs apart only in the planar direction, the invention utilizes the third dimension by bending tabs in opposite directions and arranging them at different heights and positions. This multi-dimensional arrangement achieves uniform current and heat distribution throughout the battery volume without requiring excessive lateral spacing, thus maintaining compact battery dimensions.
Solution Approach 2:
The multiple electrode tabs are arranged in a nested or interlaced pattern where negative and positive tabs alternate and interpenetrate in space. This nested configuration maximizes the utilization of available battery volume, allowing tabs to be closely spaced while maintaining proper electrical isolation and achieving uniform deterioration through optimized current pathways.
Data Source
AI summary
An electrode assembly, a secondary battery, and a battery pack are disclosed. An electrode assembly includes a first electrode, a second electrode facing the first electrode along a first direction, a negative electrode tab extending from the first electrode and bent in the first direction or in a direction opposite to the first direction, and a positive electrode tab extending from the second electrode and bent in the first direction or in the direction opposite to the first direction.