Electrode Post Frangible Venting for Battery Pressure Relief
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Solution Overview
Problem
Existing electrochemical devices face safety hazards such as explosions and fires due to pressure buildup, and existing pressure relief mechanisms often compromise the structural integrity of the shell when a frangible portion is formed on it.
Innovation Solution
A frangible portion is created on the electrode post within the electrochemical device, which breaks to relieve pressure when internal pressure reaches a threshold, avoiding structural impairment of the shell and enhancing safety without the complexity of forming the frangible portion on the shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a frangible portion is provided on the shell to relieve pressure, then pressure relief function is improved, but structural strength and structural integrity of the shell deteriorate
Solution Approach 1:
The invention divides the pressure relief function from the shell structure by placing the frangible portion on the electrode post rather than the shell. This segmentation allows the shell to maintain its structural integrity while the electrode post's frangible portion handles pressure relief, resolving the contradiction between pressure relief function and structural strength.
Solution Approach 2:
The electrode post serves as an intermediary component that transfers the pressure relief function away from the shell. By forming the frangible portion on the electrode post (which is already a separate component with its own structural requirements), the shell's structural integrity is preserved while still achieving effective pressure relief through the intermediary electrode post.
2Reliability
If a frangible portion is provided on the shell, then pressure relief function is improved, but the process complexity increases
Solution Approach 1:
By segmenting the pressure relief function to the electrode post rather than the shell, the invention simplifies the overall process. The electrode post can be manufactured with the frangible portion using existing electrode post processing techniques, avoiding the need for additional complex shell modification processes.
3Strength
If the frangible portion is provided on the electrode post, then structural integrity of the shell is maintained, but the pressure relief effectiveness may be reduced
Solution Approach 1:
The electrode post acts as an effective intermediary for pressure relief because it is directly connected to the internal environment of the electrochemical device. When the frangible portion on the electrode post breaks, it creates an opening that allows rapid pressure release, maintaining high pressure relief effectiveness while preserving shell integrity.
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
The solution effectively reduces the risk of explosions and fires by allowing pressure relief through the electrode post's frangible portion, improving the safety performance of the electrochemical device while maintaining the structural integrity of the shell.
Implementation Method 1
when a pressure in the shell reaches a threshold, the frangible portion is configured to be burst open... so as to implement communication between inside and outside of the shell to relieve the pressure
Data Source
AI summary
An electrochemical device includes a shell, an electrode post, and an electrode assembly. A through-hole is provided on the shell. The electrode post is disposed on the shell and at least partially accommodated in the through-hole. The electrode post is electrically connected to the electrode assembly. A frangible portion is provided at a position corresponding to the through-hole on the electrode post. The frangible portion is configured to be burst open when a pressure in the shell reaches a threshold, so as to implement communication between inside and outside of the shell to relieve the pressure. Provided on the electrode post, the frangible portion can be broken when the pressure in the electrochemical device reaches the threshold, so as to relieve the pressure in the electrochemical device.