Battery Cell Pressure-Relief Structure to Prevent Premature Vent Blasting
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Solution Overview
Problem
Batteries face the risk of pressure-relief blasting when thermal runaway does not occur, compromising safety and stability.
Innovation Solution
A battery cell design featuring a pressure-relief mechanism with a weak portion and a protective part that enhances connection strength between components, allowing controlled pressure release during thermal runaway, and includes a protective part that changes physical properties to facilitate timely breakage of the weak portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure-relief mechanism is designed with a weak portion to enable pressure release during thermal runaway, then safety during thermal runaway is improved, but the risk of premature pressure-relief blasting due to alternating fatigue aging increases
Solution Approach 1:
The pressure-relief mechanism is segmented into a weak portion and a protective part, where the weak portion enables pressure release during thermal runaway while the protective part reinforces the connection between the weak portion and the casing, preventing premature failure during normal use
Solution Approach 2:
The protective part is selectively applied to specific regions of the pressure-relief mechanism (the connection areas between the weak portion and casing) to provide localized reinforcement without affecting the overall pressure-relief function or the weak portion's ability to break under extreme conditions
2Reliability
If the protective part is designed to increase connection strength, then the stability during normal use is improved, but the timely breakage of the weak portion during thermal runaway may be delayed
Solution Approach 1:
The protective part is strategically positioned only at the connection interfaces between the weak portion and the casing, leaving the weak portion itself unprotected. This localized reinforcement strengthens connections during normal use while allowing the weak portion to break freely during thermal runaway
Solution Approach 2:
The pressure-relief mechanism is divided into functionally distinct segments: the weak portion for pressure release and the protective part for connection reinforcement. This segmentation allows each component to fulfill its specific function without interfering with the other
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 design ensures safe and stable operation by minimizing premature pressure-relief blasting due to alternating fatigue aging, enhancing safety and stability during normal use and thermal runaway conditions.
Implementation Method 1
the protective part is further configured to change in physical properties when the internal pressure of the casing reaches the threshold value so as to reduce or remove the force of connection of the protective part to the first portion or the second portion
Data Source
AI summary
A battery cell, a battery, an electrical device, and a method and equipment for manufacturing battery cells are provided. In some embodiments, the battery cell includes a casing, a pressure-relief mechanism and a protective part. The casing has a wall portion. The pressure-relief mechanism is provided on the wall portion. The pressure-relief mechanism includes a weak portion and a first portion and a second portion provided on two sides of the weak portion. The weak portion is used to connect the first portion and the second portion, and the pressure-relief mechanism is configured in such a way that the weak portion is broken to release pressure when the pressure in the casing reaches a threshold value. The protective part is arranged on the pressure-relief mechanism, and the protective part is used to connect the first portion and the second portion to increase strength of connection between the first portion and the second portion.