Bent Electrode Tab Layout for Uniform Battery Heat Distribution
Find Innovative SolutionsGenerate Solutions
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 bent negative and positive electrode tabs extending in opposite directions, with multiple tabs spaced apart to facilitate even heat distribution and reduce localized stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrode tabs are extended straight from the electrode, then the structure is simple and easy to manufacture, but internal heat generation causes localized deterioration
Solution Approach 1:
The electrode tab structure is segmented into multiple tabs (first and second negative electrode tabs, first and second positive electrode tabs) instead of using a single tab. These tabs are spaced apart from each other along the third direction, distributing the electrical connection points and heat generation sites throughout the battery structure, thereby preventing localized deterioration while maintaining manufacturing feasibility.
Solution Approach 2:
The electrode tabs are arranged in multiple spatial dimensions - extending in the first direction from the electrode, bent in the first direction or opposite direction, and spaced apart along the third direction. This three-dimensional arrangement distributes heat and stress more evenly throughout the battery, improving reliability without significantly complicating the manufacturing process.
2Reliability
If multiple electrode tabs are spaced apart, then heat distribution is equalized and localized stress is reduced, but the manufacturing process becomes more complex
Solution Approach 1:
The electrode assembly is segmented into multiple tabs spaced apart along the third direction, which equalizes heat distribution and reduces localized stress during charging and discharging. The segmentation is designed to align with standard manufacturing processes, where tabs can be formed and positioned using conventional electrode fabrication techniques.
Solution Approach 2:
Different regions of the battery are given different functions through the localized placement of tabs. The first and second tabs of each polarity are positioned at different locations along the third direction, creating local variations in electrical connection points that optimize heat distribution while maintaining overall structural integrity and manufacturability.
3Reliability
If electrode tabs are bent in opposite directions, then localized deterioration is equalized, but the structural complexity increases
Solution Approach 1:
The electrode tab system is segmented into pairs of tabs (first and second negative, first and second positive) with opposite bending directions. This segmentation creates a balanced configuration where the mechanical stress and heat generation from opposite bending directions counterbalance each other, equalizing deterioration across the battery structure.
Solution Approach 2:
Adjacent electrode tabs are bent in asymmetric directions - the first negative electrode tab and first positive electrode tab bend in opposite directions, as do the second tabs. This asymmetric configuration prevents uniform stress concentration and promotes even deterioration distribution, while the symmetry between tab pairs maintains overall structural balance.
Data Source
Figure 1
Figure 2
Figure 3
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.