Battery Cell End Cover Venting to Avoid Electrode Terminal Contact
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current battery safety performance is compromised due to the risk of pressure relief structures overlapping with electrode terminals during pressure relief, potentially causing short circuits.
Innovation Solution
The end cover of a battery cell incorporates a pressure relief structure with a weak portion configured as an arc, where the curvature center is located away from the electrode terminal, allowing the structure to fold away from the terminal when cracking, reducing the risk of contact and enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief structure is provided in the end cover, then the internal pressure of the battery cell can be relieved when it reaches a threshold, but the pressure relief structure may overlap with or contact the electrode terminal during pressure relief, causing short circuits and compromising safety
Solution Approach 1:
The first weak portion is designed as an arc shape with its curvature center positioned on the side farther from the through hole, creating an asymmetric geometry that ensures the pressure relief structure folds away from the electrode terminal rather than toward it, eliminating the short circuit risk
Solution Approach 2:
The first weak portion is configured as an arc rather than a straight line, and the pressure relief structure is designed to fold along this curved path, ensuring that during pressure relief the structure moves in an arc away from the electrode terminal, preventing contact and short circuits
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design effectively prevents short circuits and improves battery safety by ensuring the pressure relief structure moves away from the electrode terminal, thereby enhancing the overall safety performance of the battery cell.
Implementation Method 1
the pressure relief structure is configured to crack along the first weak portion when an internal pressure of the battery cell reaches a threshold
Implementation Method 2
at least a portion of the pressure relief structure folds toward a side facing away from the through hole to relieve the internal pressure
Data Source
AI summary
An end cover of a battery cell includes a through hole and a pressure relief structure, where the through hole is used for disposing an electrode terminal. A first weak portion of the pressure relief structure is configured as an arc, and a curvature center of the first weak portion is located on a side farther away from the through hole, so that when the first weak portion cracks, the pressure relief structure enclosed by the arc-shaped first weak portion folds toward the curvature center of the first weak portion under stress to move away from the electrode terminal. This reduces the risk of the pressure relief structure enclosed by the first weak portion overlapping with the electrode terminal, and reduces the probability of the pressure relief structure coming into contact with the electrode terminal.