Battery Cell Pressure Relief Structure to Prevent Vent Leakage
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Solution Overview
Problem
The pressure relief mechanism in existing battery technologies is prone to leakage due to welding defects and is susceptible to electrolyte creep deformation and external impacts, especially when used upside down, leading to reduced lifespan and increased risk of leakage.
Innovation Solution
The pressure relief mechanism is integrally formed with the shell at the lower portion, enhancing its rigidity and impact resistance, and features score grooves and depressed grooves to improve resistance to creep deformation and external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief mechanism is welded to the end cover, then it can be installed, but welding defects cause leakage and reduced reliability
Solution Approach 1:
The pressure relief mechanism is integrated into the shell as an integral structure, eliminating the need for separate welding operations. The shell and pressure relief mechanism form a unified component through integral forming, which removes welding defects as a source of leakage while maintaining installation capability.
2Ease of operation
If the pressure relief mechanism is located at the lower portion of the shell, then it can be positioned for pressure relief, but electrolyte creep deformation and external impacts increase leakage risk
Solution Approach 1:
The shell is constructed from high-density polyethylene material with enhanced mechanical properties, providing resistance to electrolyte creep deformation and external impacts. The integral structure combines the pressure relief mechanism with this durable material to withstand harsh operating conditions at the lower portion of the shell.
3Ease of manufacture
If the pressure relief mechanism is made separate and welded, then assembly is possible, but welding defects lead to leakage
Solution Approach 1:
The pressure relief mechanism is designed as an integral part of the shell, formed as a single piece. This eliminates the welding joint that causes leakage while maintaining the ability to assemble the pressure relief mechanism into the battery cell structure through non-welding methods.
4Reliability
If the pressure relief mechanism is integrally formed with the shell, then leakage from welding defects is avoided, but manufacturing complexity increases
Solution Approach 1:
The shell is designed with segmented features including the integrated pressure relief mechanism, score grooves, and depressed grooves that are formed as integral parts. This segmentation allows the complex integral structure to be manufactured through specialized molding processes while maintaining leakage resistance.
Data Source
AI summary
A battery cell, a battery and an electric device are provided. The battery cell includes electrode assemblies, a shell, and a pressure relief mechanism. The shell is used to accommodate the electrode assemblies. The pressure relief mechanism is provided on a lower portion of the shell and integrally formed with the shell. During normal use of the battery cell, the pressure relief mechanism is located at the lower portion of the shell.