Battery Explosion-Proof Valve Geometry for Directed Venting
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Solution Overview
Problem
Existing explosion-proof valves in batteries are prone to poor explosion-proof performance, where gas or liquid discharged from the battery can spray onto adjacent batteries, posing safety risks.
Innovation Solution
A battery design incorporating an explosion-proof valve with a fragile portion that protrudes toward the middle region of the battery casing, featuring specific geometric constraints to ensure controlled bursting and directed gas/liquid ejection, thereby preventing spray onto adjacent batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a sheet-like explosion-proof valve is used, then the structure is simple and easy to manufacture, but the explosion-proof performance is poor and gas/liquid spray to adjacent batteries
Solution Approach 1:
The explosion-proof valve is divided into a valve body and a separate fragile portion (burster). The fragile portion is designed as a distinct component that can be independently optimized for bursting characteristics, while the valve body provides the structural framework. This segmentation allows the burster to be specifically engineered for controlled fragmentation and directional ejection, improving explosion-proof performance without complicating the overall manufacturing process.
Solution Approach 2:
The fragile portion protrudes from the plane of the valve body toward the middle region of the battery, creating a three-dimensional structure. This dimensional change allows the burster to act as a guide for directing gas and liquid ejection away from adjacent batteries, solving the spray problem while maintaining structural simplicity.
2Object-affected harmful factors
If the fragile portion protrudes toward the middle region with specific geometric constraints, then the gas/liquid ejection is controlled and spray is prevented, but the device complexity increases
Solution Approach 1:
The fragile portion is designed with asymmetric geometry, protruding toward the middle region of the battery rather than being symmetrically positioned. This asymmetric design creates a specific ejection direction for gas and liquid, guiding them away from adjacent batteries. The asymmetric shape includes specific dimensional relationships (b≤20mm, 5mm³≤ab≤300mm³, 0.8≤b/c≤1.2) that optimize the bursting behavior and directional control.
Solution Approach 2:
Specific geometric parameters of the fragile portion are optimized to control bursting behavior: the protrusion distance b is limited to ≤20mm, the volume product ab is constrained between 5-300mm³, and the ratio b/c is maintained between 0.8-1.2. These parameter changes ensure controlled fragmentation and directional ejection while maintaining manufacturing feasibility.
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 solution enhances the explosion-proof performance by ensuring timely and controlled pressure release, improving safety and preventing damage to adjacent batteries.
Implementation Method 1
When the internal pressure of the battery casing reaches a certain level, the explosion-proof valve is burst open to realize pressure relief
Data Source
AI summary
A battery includes an explosion-proof valve and a battery casing. The explosion-proof valve is arranged in the battery casing. The explosion-proof valve is arranged on a first surface of the battery casing, the explosion-proof valve includes a fragile portion. The fragile portion protrudes toward a middle region of the first surface. The fragile portion includes a first end point and a second end point, and an area jointly enclosed by a connection line between the first end point and the second end point and the fragile portion between the first end point and the second end point is a. A minimum distance between the first end point and a circumferential edge of the first surface is b. A minimum distance between the second end point and the circumferential edge of the first surface is c.