Deformable Pressure Relief Member for Repeated Battery Pack Venting
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Solution Overview
Problem
Battery packs face pressure buildup due to gas accumulation during use, which can affect their performance unless effectively relieved, and existing pressure relief devices often require replacement after each use, increasing costs.
Innovation Solution
A pressure relief device comprising a mounting seat, valve core, and deformable pressure relief member that opens and closes a pressure relief channel based on pressure thresholds, allowing for repeated use without damaging the device's structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pressure relief device is used to discharge gas from a battery pack, then the pressure inside the battery pack is reduced, but the device requires replacement after each use which increases cost
Solution Approach 1:
The pressure relief member is designed as a deformable component that dynamically changes its state between blocked and open based on pressure conditions. Under normal pressure, it remains blocked to seal the pressure relief channel. When pressure exceeds the preset threshold, it deforms to open the channel for gas discharge, then automatically returns to blocked state when pressure normalizes, enabling repeated use without replacement.
Solution Approach 2:
The pressure relief member utilizes material deformation properties to change its physical state in response to pressure parameter changes. The member deforms when pressure exceeds a predetermined threshold value, opening the pressure relief channel, and returns to its original state when pressure decreases, closing the channel again. This parameter-driven state change enables the device to achieve repeated pressure relief cycles.
2Reliability
If a deformable pressure relief member is used to enable repeated pressure relief, then the device can be reused multiple times, but the structure becomes more complex
Solution Approach 1:
The pressure relief member integrates multiple functions into a single component: it serves as both the sealing element and the pressure-responsive actuator. The member combines the sealing function (blocking the pressure relief channel) with the pressure-sensing and actuation function (deforming to open the channel when pressure exceeds threshold), eliminating the need for separate components and simplifying the overall device structure.
Solution Approach 2:
The pressure relief member is designed to automatically respond to pressure changes without external control. It self-activates by deforming when pressure exceeds the preset threshold, opens the pressure relief channel, and self-closes when pressure normalizes. This self-service mechanism eliminates the need for complex control systems, sensors, or external actuation mechanisms, achieving repeated use capability with minimal structural complexity.
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 device efficiently relieves pressure in battery packs by using the elasticity of the pressure relief member to open and close the pressure relief channel, allowing for multiple uses without structural damage and reducing costs by eliminating the need for frequent replacements.
Implementation Method 1
the pressure relief member is deformable and is configured to open and close the pressure relief channel by means of its deformation
Implementation Method 2
the pressure relief member is made of a material having a deformation property
Data Source
AI summary
A pressure relief device includes a mounting seat, a valve core, and a pressure relief member. The mounting seat is internally provided with a fluid channel, and the fluid channel is capable of communicating with an internal space of a component to be subject to pressure relief. The valve core is arranged to be aligned with the fluid channel in the mounting seat, and a pressure relief channel is formed between an outer edge of the valve core and an inner wall of the fluid channel of the mounting seat. The pressure relief member is sleeved on the outer edge of the valve core and is deformable and configured to open and close the pressure relief channel by means of its deformation. The pressure relief device of the present application utilizes the deformable property of the pressure relief member to achieve the effect of repeated use and multiple pressure reliefs of the pressure relief device.