Battery Explosion-Proof Valve Groove Layout for Weld Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing explosion-proof valves in batteries are prone to unstable welding, which can lead to unintended opening during pressure relief, compromising safety due to insufficient area and structural strength of the opening region, resulting in potential explosions or burning.
Innovation Solution
An explosion-proof valve with a specifically designed opening region featuring an oblong shape and scored grooves, including straight and arc segments, ensures a minimum area of 80 mm^2 for efficient gas discharge and increased structural strength, preventing untimely opening and enhancing stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the explosion-proof valve is welded to the battery cover plate, then the valve can be mounted on the battery, but the welding stability is insufficient causing the valve to be blown open during pressure relief
Solution Approach 1:
The opening region is divided into multiple scored grooves (first scored groove, second scored groove, third scored groove) with different depths and positions. This segmentation allows the structure to deform in a controlled manner during pressure relief, distributing the stress and preventing the entire valve from being blown open while maintaining welding stability.
Solution Approach 2:
The scored grooves are pre-formed on the cover plate at specific locations and depths before the pressure relief event occurs. These pre-formed grooves create weak points that will preferentially fail under pressure, guiding the deformation pattern and preventing uncontrolled blowout of the welded valve.
2Productivity
If the opening region area is increased to improve pressure relief speed, then the gas discharge efficiency increases, but the structural strength decreases making the valve more prone to unintended opening
Solution Approach 1:
Different regions of the cover plate have different structural qualities through the scored grooves. The first scored groove (deeper) is located at the center to provide initial opening capability, while the second and third scored grooves (shallower) are positioned at the periphery to maintain structural strength. This local differentiation allows the opening region to have sufficient area for fast pressure relief while maintaining overall structural integrity through the peripheral grooves.
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 enhanced design allows for timely and effective pressure relief, improving safety by ensuring the structural integrity and reliability of the explosion-proof valve, reducing the risk of accidents such as battery explosions or burning.
Implementation Method 1
When the gas pressure in the battery exceeds the opening pressure of the explosion-proof valve, the explosion-proof valve can be opened to release the gas generated inside the battery
Data Source
AI summary
A explosion-proof valve body of a battery has an opening region, which is provided with an explosion-proof notched groove at the edge thereof. The explosion-proof notched groove comprises a first straight line section, two arc sections and at least one second straight line section. Two ends of the first straight line section are connected to the two arc sections, respectively; at least one of the ends of the second straight line section is connected to the arc section; and the first straight line section is arranged parallel to the second straight line section. In a depth direction of the explosion-proof notched groove, an orthographic projection of the opening region is in an oblong shape. An outer edge of the orthographic projection of the opening region is a predetermined opening boundary, and the area of the orthographic projection of the opening region is S, where S=a×b+π×b2/4, S≥80 mm2, and b≥6 mm.