Battery Cell Side-Wall Venting for Shorter Pressure Release Paths
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Solution Overview
Problem
Lithium-ion batteries face challenges in safely releasing internal pressure when it exceeds a threshold, particularly in long battery cells where the pressure relief mechanism's path is inefficient, leading to potential explosions.
Innovation Solution
A pressure relief mechanism is strategically positioned on a first wall of the battery cell housing, opposite to the region between adjacent electrode assemblies, to create a short and effective path for pressure release, enhancing safety by ensuring efficient gas expulsion and reducing the risk of explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the pressure relief mechanism is positioned on the end wall of a long battery cell, then the pressure release path becomes excessively long, but positioning it on the side wall reduces the pressure release efficiency
Solution Approach 1:
The patent transitions from traditional end-wall pressure relief (one-dimensional path along cell length) to side-wall pressure relief (introducing a transverse dimension). By positioning the pressure relief mechanism on the side wall opposite to electrode assemblies, the pressure release path becomes a direct transverse path through the housing thickness, dramatically reducing path length while maintaining relief efficiency.
2Length of moving object
If the pressure relief mechanism is disposed on the first wall opposite to electrode assemblies, then the pressure release path is shortened, but the structural complexity of the housing increases
Solution Approach 1:
The side wall of the housing serves multiple functions: it provides mechanical containment for electrode assemblies and simultaneously houses the pressure relief mechanism. This multi-functional design avoids adding separate structural elements, thereby reducing overall complexity while achieving short pressure release paths.
3Reliability
If the pressure relief mechanism is located on the first wall opposite to adjacent electrode assemblies, then the pressure release efficiency is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The pressure relief mechanism is positioned at a specific location on the side wall that is naturally opposite to the region between electrode assemblies. This location-based quality ensures optimal pressure release efficiency while the housing structure itself provides natural alignment references, reducing the need for high-precision manufacturing tolerances.
Data Source
AI summary
A battery cell includes: a housing; a plurality of electrode assemblies, accommodated in the housing; and a pressure relief mechanism, disposed on a first wall of the housing and located at a position on the first wall, where the position is opposite to a middle region between two adjacent electrode assemblies among the plurality of electrode assemblies, and the pressure relief mechanism is configured to release an internal pressure of the battery cell when the internal pressure of the battery cell exceeds a threshold.