Explosion-proof Valve Scoring for Battery Safety
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Solution Overview
Problem
Existing explosion-proof valves for batteries are prone to unstable welding, which can lead to unintended opening during pressure relief, compromising safety and affecting the reliability of the battery system.
Innovation Solution
The design of an explosion-proof valve with an oblong opening region and a scored groove structure, optimized to ensure a reasonable area for gas discharge and increased structural strength, thereby improving stability and safety.
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 unstable welding causes the entire valve to be blown open during pressure relief
Solution Approach 1:
The opening region is divided into multiple scored grooves (first straight line segment, arc segments, second straight line segment) that create segmented fracture paths. This segmentation ensures that only the scored groove portions open during pressure relief, preventing the entire valve from being blown open and maintaining welding stability.
Solution Approach 2:
The scored grooves are pre-formed in the opening region before the valve is subjected to pressure. These pre-formed grooves dictate the fracture path when pressure is applied, ensuring controlled opening at specific locations rather than unpredictable blow-out of the entire valve structure.
2Productivity
If the opening region area is increased to improve pressure relief speed, then gas discharge amount increases, but the structural strength of the opening region decreases
Solution Approach 1:
The opening region has non-uniform thickness created by the scored grooves. The grooves create localized thin regions that fracture easily for gas discharge, while the surrounding un-scored areas maintain full thickness and structural strength. This local quality variation allows both fast pressure relief and maintained strength.
Solution Approach 2:
The opening region employs asymmetric geometry with straight line segments and arc segments of different curvatures and lengths. This asymmetric design optimizes the stress distribution during pressure relief, allowing controlled fracture along the scored paths while maintaining overall structural integrity through the asymmetric reinforcement patterns.
Data Source
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AI summary
A vehicle, comprising a battery pack. The battery pack comprises a battery or a battery module. The battery comprises an explosion-proof valve. The explosion-proof valve comprises an explosion-proof valve body. The explosion-proof valve body has an opening region, and the opening region 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≥80mm2, and b≥6mm.