Battery Housing Inert Gas Control Using Oxygen Threshold Sensing
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Solution Overview
Problem
Electrical stored energy sources face challenges in managing thermal events, leading to the formation of combustible gas mixtures, which require large amounts of inert gas to prevent explosive conditions, resulting in increased weight, space, and cost.
Innovation Solution
A method that meters inert gas into the housing based on oxygen concentration measurements, ensuring the oxygen level remains below the limiting oxygen concentration, reducing the need for excessive inert gas storage and usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is completely flooded with inert gas to prevent explosive mixtures, then safety is improved, but the amount of inert gas required increases significantly
Solution Approach 1:
The patent changes the parameter of oxygen concentration from unlimited to controlled below the limiting oxygen concentration (LOC). By actively monitoring and controlling the oxygen concentration parameter rather than using complete flooding, the system achieves the same safety level with significantly reduced inert gas consumption.
Solution Approach 2:
The patent introduces an oxygen sensor that continuously monitors the oxygen concentration in the housing and provides feedback to the control unit. This feedback mechanism enables dynamic adjustment of inert gas metering to maintain oxygen concentration below the LOC, optimizing both safety and inert gas usage.
2Reliability
If large amounts of inert gas are stored ready for immediate use, then safety response capability is improved, but weight and space requirements increase
Solution Approach 1:
The patent transforms the safety approach from storing large volumes of inert gas to storing a controlled amount and regulating its release based on oxygen concentration parameters. The control unit meters inert gas from the storage container based on real-time oxygen sensor data, enabling effective safety response with minimal stored gas and reduced weight.
Solution Approach 2:
The patent introduces dynamic control through the control unit that adjusts inert gas metering based on real-time oxygen concentration measurements. This dynamic response system replaces static complete flooding with adaptive gas supplementation, reducing the required inert gas storage capacity and overall system weight.
3Reliability
If complete flooding with inert gas is used, then safety is improved, but production costs and operation costs increase
Solution Approach 1:
The patent changes the safety approach from complete flooding (high inert gas consumption) to oxygen concentration control below LOC (reduced inert gas consumption). This parameter-based control reduces both the quantity of inert gas needed and the complexity of the safety system, thereby reducing production and operational costs.
Solution Approach 2:
The patent implements a feedback-controlled system with oxygen sensing and automated inert gas metering. This intelligent control mechanism replaces the simpler but more resource-intensive complete flooding approach, reducing inert gas consumption and associated costs while maintaining safety effectiveness.
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
This approach allows for reliable operation with reduced inert gas demand, minimizing weight, space, and production costs while ensuring safety by maintaining oxygen levels below the combustion threshold.
Implementation Method 1
The oxygen concentration is ascertained by use of an oxygen sensor of the electrical stored energy source
Implementation Method 2
The threshold value is equal to or less than the limiting oxygen concentration, which is defined as the maximum oxygen concentration at which no combustion of the mixture of combustible gas, air, and inert gas in the electrical stored energy source is possible
Data Source
AI summary
A method for operating an electrical stored energy source having a housing and at least one storage cell which is situated inside the housing. The method includes: first, a malfunction of the at least one storage cell and/or of the electrical stored energy source is determined, in which malfunction a fuel gas-air mixture is formed inside the housing. Then, inert gas is metered into the housing by a metering device of the electrical stored energy source, wherein sufficient inert gas is metered into the housing that the oxygen concentration inside the housing assumes a threshold value. The oxygen concentration is detected by an oxygen sensor of the electrical stored energy source. The threshold value is less than or equal to the oxygen limit concentration, which is defined as the maximum oxygen concentration at which combustion of the mixture of fuel gas, air and inert gas in the electrical stored energy source is not possible.