Pressure Relief Valve Structure for Battery Pack Thermal Shock
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Solution Overview
Problem
Existing pressure relief valves for vehicle battery packs lack robustness and convenience in connection and testing, and they fail to maintain effective bidirectional gas exchange and pressure balance under varying conditions, especially during thermal shock.
Innovation Solution
A pressure relief valve design featuring a valve body, a valve cover, a flexible element with a compression portion, and a breathable film, which forms two fluid channels for gas exchange. The flexible element is deformable to open the second fluid channel when internal pressure exceeds a threshold, ensuring effective pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional pressure relief valve structure is used, then the basic pressure relief function is achieved, but the connection robustness and testing convenience are insufficient
Solution Approach 1:
The pressure relief valve is divided into separate components including a valve body, valve cover, flexible element, and breathable film. This segmentation allows for easier assembly, disassembly, and testing of individual components while maintaining overall connection robustness through precise mating surfaces and sealing interfaces between segments.
Solution Approach 2:
A flexible element with compression portion and breathable film is used instead of rigid traditional valve mechanisms. The flexible element can deform under pressure differential to open or close the valve, providing robust sealing when closed while allowing easy deformation for opening, thus improving connection reliability without complex mechanical structures.
2Adaptability or versatility
If a simple valve structure is used, then manufacturing is easier, but bidirectional gas exchange and pressure balance under varying conditions cannot be maintained
Solution Approach 1:
The pressure relief valve is designed to perform multiple functions: bidirectional gas exchange under normal conditions and pressure relief during thermal shock. The single valve structure with flexible element and two fluid channels achieves both functions without requiring separate valves, maintaining adaptability while controlling complexity.
Solution Approach 2:
The valve incorporates a flexible element that can dynamically change its state between open and closed positions based on pressure differential. This dynamic response allows the valve to automatically adapt to varying conditions, enabling bidirectional gas exchange when pressure is balanced and closing to relieve pressure when thermal shock occurs.
3Reliability
If a rigid valve structure is used, then structural stability is achieved, but effective pressure relief during thermal shock cannot be ensured
Solution Approach 1:
The valve uses a flexible element with compression portion and breathable film instead of rigid components. This flexible structure can rapidly deform in response to pressure differential during thermal shock, ensuring effective pressure relief while the overall valve body and cover maintain structural stability through their rigid construction and secure connection.
Solution Approach 2:
The valve relies on changes in the physical state and position of the flexible element in response to pressure differential. When pressure differential exceeds a threshold, the flexible element deforms and moves to open the valve for pressure relief. This parameter-based response ensures reliable pressure relief during thermal shock while the stable valve body provides a consistent structural framework.
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 proposed pressure relief valve maintains bidirectional gas exchange and pressure balance under conventional conditions and effectively reduces pressure in the battery pack during thermal shock, ensuring reliable operation and safety.
Implementation Method 1
the flexible element has a compression portion at least partially surrounding the through hole and configured to be deformable to make the flexible element displace relative to the valve body
Implementation Method 2
a breathable film covering the through hole; wherein the breathable film forms a first fluid channel of the pressure relief valve
Data Source
AI summary
A pressure relief valve includes a valve body; a valve cover matched with the valve body; a flexible element positioned between the valve body and the valve cover and having a through hole; and a breathable film covering the through hole. The flexible element has a compression portion at least partially surrounding the through hole and configured to be deformable to make the flexible element displace relative to the valve body. A battery pack can use the pressure relief valve. Due to the use of the pressure relief valve, internal pressure of the battery pack can be controlled.