Battery Module Valve Member Pressure Relief
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Solution Overview
Problem
High-capacity rechargeable batteries in sealed housings can explode due to insufficient internal pressure relief, as the gas exhaust mechanism is not effective in rapidly releasing internal gases, leading to increased pressure and potential ignition.
Innovation Solution
A battery module design featuring a housing with a gas exhaust hole and a valve member that opens at a pressure lower than the threshold pressure of the rechargeable batteries, allowing for rapid gas release and improved safety by maintaining a lower internal pressure within the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rechargeable batteries are positioned in a sealed housing, then the housing maintains its sealing integrity, but the internal pressure of the housing increases and gas cannot be rapidly exhausted
Solution Approach 1:
A valve member is pre-installed on the housing to cover the gas exhaust hole, creating a pressure relief mechanism before any dangerous pressure buildup occurs. This preliminary safety feature ensures that when pressure does increase, the system can rapidly exhaust gas through the pre-positioned valve, resolving the contradiction between maintaining sealing and preventing pressure buildup.
2Reliability
If the pressure for opening the valve member is set high, then the housing maintains sealing at normal pressures, but gas cannot be rapidly exhausted when battery pressure reaches threshold
Solution Approach 1:
The opening pressure parameter of the valve member is specifically set to be lower than the threshold pressure of the battery's gas exhaust member (between 60%-90% of battery threshold pressure). This parameter change ensures the valve opens early enough to rapidly exhaust gas before the battery vent activates, maintaining both sealing integrity and rapid gas exhaust capability.
3Productivity
If the valve member opening pressure is lower than battery threshold pressure, then gas can be rapidly exhausted, but the valve may open at inappropriate times
Solution Approach 1:
The valve member operates based on real-time pressure feedback from the housing interior. When internal pressure reaches the valve's opening pressure (set below battery threshold), the valve automatically opens to exhaust gas, and closes when pressure drops. This pressure-driven feedback mechanism ensures the valve opens only when genuinely needed, preventing inappropriate activation while maintaining rapid exhaust capability.
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 enables rapid and controlled gas exhaust from the battery module, reducing the risk of explosion and ensuring safer operation by setting the valve member's opening pressure between 60% and 90% of the battery's threshold pressure, thus maintaining the housing's sealing while allowing for efficient pressure relief.
Implementation Method 1
a pressure for opening the valve member is lower than the threshold pressure
Implementation Method 2
a housing holding the rechargeable batteries and having a gas exhaust hole
Data Source
AI summary
A battery module includes a plurality of rechargeable batteries each having a gas exhaust member openable at a threshold pressure; a housing holding the rechargeable batteries and having a gas exhaust hole; and a valve member covering the gas exhaust hole, wherein a pressure for opening the valve member is lower than the threshold pressure.