Battery Pack Pressure Relief Venting With Elastic Seat Control
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Solution Overview
Problem
Existing pressure relief devices for battery packs suffer from poor deformation consistency and bursting pressure reliability due to the use of composite gas-permeable membranes, making it difficult to ensure reliable pressure relief during thermal runaway.
Innovation Solution
A pressure relief device comprising a gas-permeable membrane, a valve body, an elastic seat assembly, and a protective cover, where the elastic seat assembly is movable to open or close a gas discharge channel, allowing for controlled gas discharge and improved pressure relief reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If composite gas-permeable membranes are used in pressure relief devices, then gas discharge functionality is provided, but deformation consistency and bursting pressure reliability deteriorate
Solution Approach 1:
The pressure relief device is divided into multiple functional components: a rupture disk for primary pressure relief, a membrane for controlled gas discharge, and a valve assembly with elastic seat. This segmentation allows each component to perform its specific function with optimized performance, avoiding the compromise inherent in using composite membranes for all functions.
Solution Approach 2:
The elastic seat assembly acts as an intermediary between the membrane and the valve body, providing a mechanical advantage system that amplifies the membrane's movement to reliably open the gas discharge channel. This intermediary mechanism ensures consistent actuation regardless of variations in membrane deformation.
2Ease of operation
If elastic seat assembly is made movable to open gas discharge channel, then controlled gas discharge is improved, but device complexity increases
Solution Approach 1:
The elastic seat assembly is designed to be movable rather than fixed, allowing it to dynamically respond to pressure changes by opening or closing the gas discharge channel. This dynamic capability enables controlled gas discharge while maintaining a relatively simple overall structure through the use of elastic deformation and mechanical leverage.
Solution Approach 2:
The elastic seat assembly automatically opens and closes the gas discharge channel in response to pressure changes without requiring external control mechanisms. The membrane's deformation directly actuates the elastic seat, creating a self-regulating system that simplifies the overall device architecture while achieving controlled gas discharge.
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 ensures reliable pressure relief by allowing for both controlled and rapid gas discharge based on the pressure changes in the battery pack, enhancing the consistency and reliability of the pressure relief process.
Implementation Method 1
a gas-permeable membrane (1), a valve body (2), an elastic seat assembly (3), and a protective cover (4); the gas-permeable membrane (1) is arranged at a side of the elastic seat assembly (3) and is configured for gas discharge
Implementation Method 2
the elastic seat assembly (3) is movable towards the protective cover (4) to define an gas discharge channel between the valve body (2) and the elastic seat assembly (3), or movable away from the protective cover (4) to close the gas discharge channel
Data Source
AI summary
A pressure relief device includes a gas-permeable membrane, a valve body, an elastic seat assembly, a protective cover and a baffle. The gas-permeable membrane is arranged at a side of the elastic seat assembly. The valve body is located at a side of the elastic seat assembly close to the gas-permeable membrane. The protective cover covers a side of the valve body away from the gas-permeable membrane. The elastic seat assembly is located between the valve body and the protective cover, and movable towards the protective cover to define a gas discharge channel or movable away from the protective cover to close the gas discharge channel. The baffle is arranged at a side of the gas-permeable membrane away from the elastic seat assembly. A reserved gap is arranged between the baffle and the gas-permeable membrane, and between the gas-permeable membrane and the elastic seat assembly.