Battery Cell Pressure Relief Member for Wear-Resistant Venting
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Solution Overview
Problem
Existing battery cells face issues of poor use stability and relatively short service life due to internal pressure management problems during thermal runaway.
Innovation Solution
A battery cell design featuring a housing with a pressure relief member that includes a weak structure, such as an indented groove, which does not extend beyond the first side surface of the housing, to manage internal pressure and prevent premature valve opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the weak structure of the pressure relief member extends beyond the first side surface in the thickness direction, then the pressure relief function is improved, but the structural strength is reduced and wear damage occurs during production and assembly
Solution Approach 1:
The pressure relief member is designed with non-uniform thickness, featuring a weak structure region with reduced thickness (e.g., through indented grooves or thinned regions) that does not extend beyond the first side surface. This local quality variation allows the protruding portion to provide pressure relief functionality while the recessed portion maintains structural strength and avoids wear damage during assembly and handling.
2Reliability
If the weak structure protrudes from the first side surface, then pressure relief capability is enhanced, but wear and damage occur during production, assembly, storage and transport
Solution Approach 1:
The pressure relief member incorporates a weak structure with reduced thickness (such as indented grooves or thinned regions) that creates a protruding portion for pressure relief while ensuring the overall structure does not extend beyond the first side surface in the thickness direction, thereby preventing wear and damage during production, assembly, storage and transport.
Solution Approach 2:
The weak structure is pre-designed with controlled thickness reduction in specific regions before the battery cell is assembled and put into service. This preliminary design ensures that the pressure relief member will function at the appropriate pressure threshold while avoiding premature wear and damage during manufacturing and handling processes.
3Reliability
If the weak structure extends beyond the first side surface, then pressure relief function is improved, but the use safety is reduced due to premature valve opening
Solution Approach 1:
The pressure relief member features a weak structure with reduced thickness (such as indented grooves or thinned regions) that is precisely controlled to not extend beyond the first side surface in the thickness direction. This design ensures the pressure relief function is achieved at the correct pressure threshold while preventing premature valve opening that would compromise battery safety.
Data Source
AI summary
A battery cell, a battery, an energy storage apparatus, and an electrical apparatus. The battery cell comprises a housing and a pressure relief member. The housing has a first wall, and the first wall has a first side surface facing the interior of the battery cell. The pressure relief member is disposed on the first wall. The pressure relief member has a weak structure. The pressure relief member is configured to relieve the internal pressure of the battery cell. In the thickness direction of the first wall, the weak structure does not go beyond the first side surface in a direction toward the interior of the battery cell.