Battery Explosion-Proof Valve Buffer Structure for Weak-Point Stress
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Solution Overview
Problem
Stress concentration in the weak explosive area of explosion-proof valves can affect their long-term reliability and reduce their service life due to procedures like ultrasonic welding and internal pressure variations in power battery cells.
Innovation Solution
An explosion-proof valve design featuring a mounting part and a body part with a weak part and a first buffer part, where the weak part is positioned at a minimum explosive pressure area, and the first buffer part is configured to provide flexible deformation, reducing stress concentration and enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional valve body with a valve hole is used, then the battery structure is simple, but explosive gas can directly contact the external environment causing safety hazards
Solution Approach 1:
The valve body is divided into an upper valve body and a lower valve body that can be separated. The upper valve body includes a valve hole, while the lower valve body includes a filter assembly. This segmentation allows the filter to be positioned between the battery interior and the external environment, blocking explosive gas while maintaining structural simplicity.
Solution Approach 2:
A filter assembly is introduced as an intermediary component between the battery interior and the external environment. The filter includes a filter plate with filter holes that allow gas passage while filtering out explosive particles, thus preventing direct contact between explosive gas and the external environment.
2Reliability
If the filter assembly is tightly fixed to prevent gas leakage, then sealing performance is improved, but cleaning and maintenance become difficult
Solution Approach 1:
The valve body is segmented into upper and lower parts that can be separated. The filter assembly is attached to the lower valve body, which can be detached from the upper valve body. This allows the filter to be accessed for cleaning by simply separating the valve body halves, maintaining both sealing performance and ease of maintenance.
Solution Approach 2:
The connection between the upper and lower valve bodies is designed to be dynamically separable. The valve bodies can be easily assembled and disassembled, allowing the filter assembly to be accessed for cleaning while maintaining tight sealing during operation. The dynamic nature of the connection enables transition between sealed operation mode and maintenance mode.
3Reliability
If a filter assembly is added to block explosive gas, then safety is improved, but the valve structure becomes more complex
Solution Approach 1:
The filter assembly is merged with the lower valve body as an integrated component. The filter plate is positioned within the lower valve body structure, combining the filtering function with the existing valve structure. This reduces overall complexity compared to adding a separate filter system while maintaining safety improvements.
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 flexible deformation of the buffer part buffers excessive stress, preventing rapid fatigue and prolonging the service life of the explosion-proof valve, while maintaining the opening threshold stability.
Implementation Method 1
a filter assembly (120) attached to the lower valve body (112), the filter assembly (120) comprising a filter plate (121) with a plurality of filter holes (121a)
Implementation Method 2
an elastic element (141) disposed inside the valve hole (113a) and configured to elastically deform in the second direction
Implementation Method 3
When an internal combustion engine is in a state of explosion, a pressure differential is generated between the inside and outside of the valve assembly (110) in the first direction
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The present application belongs to the technical field of power batteries, in particular to an explosion-proof valve, a top cover assembly and a battery. The explosion-proof valve includes a mounting part and a body part, the mounting part is arranged on a peripheral edge of the body part, the body part includes a weak part and a first buffer part, and the weak part is arranged between the mounting part and the first buffer part or the weak part is arranged on the first buffer part. The weak part is located at a position with a minimum explosive pressure on the explosion-proof valve, and is configured to open the explosion-proof valve when an air pressure in an inner space of the top cover assembly reaches an opening threshold of the explosion-proof valve. When the explosion-proof valve provided by the present application is influenced by external factors which are easy to cause stress concentration in the weak part, the first buffer part can generate flexible deformation, so as to provide a certain amount of flexible deformation to buffer the weak part, thereby avoiding excessive stress in the weak part, weakening the impact on the explosion-proof valve, ensuring application reliability of the explosion-proof valve and achieving a purpose of prolonging a service life of the explosion-proof valve.