Battery Fire Suppression Using Early Gas Detection and Cooling
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Solution Overview
Problem
Existing fire suppression systems for electrochemical units in vehicles, such as automotive batteries, fail to provide sufficient time for evacuation due to inadequate detection and response to overheating or fire, and lack redundancy and cost-effectiveness.
Innovation Solution
A fire suppression system with a fire extinguishing fluid container, outlet device, gas detector, and control unit that detects specific gas compounds or temperature changes to initiate the discharge of extinguishing fluid around the electrochemical unit, providing rapid and effective cooling and protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a temperature sensor is used for fire detection, then the system can detect overheating, but the detection time is delayed and insufficient for early evacuation
Solution Approach 1:
The gas detector device detects gas characters (such as CO, H2, or other gases) emitted during the early stages of thermal runaway, before temperature reaches critical levels. This preliminary detection enables earlier warning and evacuation time compared to temperature-based systems that only react when overheating is already severe.
Solution Approach 2:
The detection function is segmented into multiple independent sensors: a gas detector device for early chemical change detection and a temperature sensor for thermal monitoring. This segmentation allows the system to detect different stages of battery failure separately, with gas detection providing early warning and temperature detection providing backup confirmation.
2Reliability
If fire extinguishing fluid is discharged immediately upon detection, then fire is extinguished quickly, but the system may activate falsely without sufficient confirmation
Solution Approach 1:
The control unit receives feedback from both the gas detector device and temperature sensor, comparing their readings against predetermined thresholds. The system requires confirmation from multiple detection channels before activating the fire extinguishing fluid discharge, reducing false activations while maintaining rapid response when genuine threats are detected.
Solution Approach 2:
The system performs preliminary comparison of detected gas characters and temperature values against predetermined thresholds before triggering fluid discharge. This preliminary verification step ensures that activation only occurs when readings confirm a genuine thermal runaway event, not normal operation or minor anomalies.
3Reliability
If multiple detection mechanisms are added to improve detection accuracy, then reliability increases, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it processes gas detector signals, processes temperature sensor signals, compares readings against thresholds, and controls the fire extinguishing fluid discharge. By making the control unit multi-functional, the system achieves high detection reliability through multiple sensors without proportionally increasing overall system complexity.
Solution Approach 2:
The gas detector device and temperature sensor are integrated into a single fire suppression system with a unified control unit. This merging allows the system to benefit from multiple detection mechanisms while sharing common infrastructure (power supply, control logic, fluid discharge mechanism), thereby limiting the increase in overall complexity.
4Temperature
If fire extinguishing fluid is discharged fully around the electrochemical unit, then cooling effectiveness is maximized, but fluid consumption increases
Solution Approach 1:
The outlet device is positioned and configured to discharge fire extinguishing fluid specifically at locations where thermal runaway is detected or most likely to occur. This localized discharge approach concentrates cooling effectiveness at the critical heat source rather than uniformly cooling the entire battery pack, reducing overall fluid consumption while maintaining effective temperature control.
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 system effectively delays the development of fire, protects the electrochemical unit from damage, and provides longer evacuation time by rapidly detecting overheating and initiating extinguishing fluid discharge, enhancing reliability and redundancy.
Implementation Method 1
a gas detector device associated with the electrochemical unit and configured for detecting at least one gas character
Implementation Method 2
discharge the fire extinguishing fluid on and/or into and/or fully around and/or partly around the electrochemical unit... effectively reduces heat output and provides longer evacuation time... ensuring rapid and effective cooling
Data Source
AI summary
A fire suppression system including a gas detector device associated with an electrochemical unit and configured for detecting at least one gas character; a control unit coupled to the gas detector device and configured to, in a first comparison execution, compare said at least one gas character with at least one pre-set indicative gas character; wherein the control unit is configured to command an outlet device to discharge a fire extinguishing fluid over the electrochemical unit if the first comparison execution signifies that the detected gas character corresponds with the pre-set indicative gas character.