Battery Cell Tab Geometry for Expansion-Induced Tear Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Battery cell expansion during charging affects reliability, leading to potential tab tearing and reduced safety.
Innovation Solution
Design tabs with a first dimension greater than or equal to the distance between their side edges, ensuring they remain in a relaxed state before and after electrode body expansion, thereby reducing the likelihood of being pulled and torn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode body thickness is reduced to a preset value or less, then the tab is in a relaxed state and less likely to be pulled and torn, but the battery cell capacity may be limited
Solution Approach 1:
The patent changes the thickness parameter of the electrode body to a preset value or less, which transforms the tab from a stressed state to a relaxed state. This parameter change prevents tab tearing during battery expansion while maintaining acceptable capacity through optimized electrode material composition and structure.
2Reliability
If the tab first dimension is increased to be greater than or equal to the distance between side edges, then the tab remains in a relaxed state during expansion, but the device complexity increases
Solution Approach 1:
The patent modifies the dimensional parameter of the tab (first dimension) to be greater than or equal to the distance between its side edges. This simple geometric parameter change ensures the tab maintains a relaxed state during battery expansion without introducing complex structural designs, achieving reliability improvement with minimal complexity increase.
3Quantity of substance
If the electrode body is allowed to expand freely during charging, then the charging capacity is maximized, but the tab may be pulled and torn reducing safety
Solution Approach 1:
The patent optimizes the electrode body thickness parameter to a preset value or less, which allows the battery to achieve high charging capacity while the tab simultaneously maintains a relaxed state that prevents tearing during expansion. This parameter optimization resolves the contradiction between capacity maximization and safety maintenance.
Solution Approach 2:
The patent pre-configures the tab dimensions (first dimension greater than or equal to distance between side edges) before battery operation. This preliminary dimensional design ensures the tab is already in a relaxed state that can accommodate expansion during charging without tearing, preventing safety issues before they occur.
Data Source
AI summary
A battery cell comprises an electrode body and tabs, the thickness of the electrode body is smaller than or equal to a preset thickness value, each tab has a first side edge and a second side edge which are opposite, and the first side edge of the tab is connected to the electrode body, wherein a first size of the tab is greater than or equal to a distance between the first side edge of the tab and the second side edge of the tab, and the first size is a length that the tab extends from the side where the first side edge is located to the side where the second side edge is located.