Battery Pack Gas Sensing for Early Thermal Runaway Detection
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Solution Overview
Problem
Existing Battery Management Systems (BMS) often fail to detect thermal runaway events in large battery packs, leading to potential fires or explosions, and do not provide early warnings to operators or drivers of electric vehicles.
Innovation Solution
A gas sensing system comprising sensors, a fan, tubes with aspirating points, and a control unit that pulls gases and particulates from the battery pack and directs them onto sensors to detect changes in physical stimuli, such as gas concentration, which helps in identifying thermal runaway events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional BMS is used to monitor battery status, then the system can detect overcharge, undercharge, and over-temperature conditions, but it fails to detect thermal runaway events early enough to prevent fires or explosions
Solution Approach 1:
The system performs preliminary action by continuously monitoring gas concentrations inside the battery enclosure before thermal runaway occurs. The gas sensor detects early signs of thermal runaway (such as CO, CO2, or other decomposition gases) and triggers an alarm, enabling preventive action before the actual thermal runaway event happens.
Solution Approach 2:
The patent introduces an intermediary gas sensor that detects thermal runaway events by monitoring gas composition changes inside the battery enclosure. This intermediary detection method bridges the gap between traditional electrical parameters monitoring and actual thermal runaway detection, providing early warning through gas analysis.
2Reliability
If gas sensors are placed inside the battery enclosure to detect thermal runaway, then early detection capability is improved, but the system complexity and cost increase
Solution Approach 1:
The control unit serves multiple functions: it controls the fan operation, processes gas sensor signals, determines thermal runaway events, and triggers alarms. By making the control unit multi-functional, the system avoids adding separate dedicated components for each function, thereby reducing overall system complexity while maintaining high detection reliability.
Solution Approach 2:
The system uses the battery pack's own internal environment (the enclosure space where gases are naturally generated during thermal runaway) as the detection chamber. The existing battery structure serves the dual purpose of containing batteries and providing the sensing environment, eliminating the need for separate sensing chambers or complex sample collection systems.
3Measurement precision
If a fan and tube system is added to pull gases onto sensors, then detection sensitivity is improved, but the device complexity and power consumption increase
Solution Approach 1:
The fan operates periodically rather than continuously - it is activated only when the control unit determines that a thermal runaway event is occurring or suspected. This periodic operation significantly reduces power consumption compared to continuous operation, while still maintaining high detection sensitivity when needed.
Solution Approach 2:
The system uses pneumatic principles by employing a fan to create air flow that pulls gases through tubes onto the sensor. This pneumatic approach is simpler and more energy-efficient than alternative methods such as heating elements for gas extraction or complex mechanical pumping systems, achieving good sensitivity with moderate power consumption.
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 detects thermal runaway events by monitoring gas and particulate concentrations, providing early warnings through an alarm system, thus enhancing safety by preventing potential fires or explosions.
Implementation Method 1
The control unit is configured to control the fan to pull, through the plurality of tubes, gases and/or particulates generated in the battery pack
Implementation Method 2
The at least one gas sensor is configured to detect a change in one or more physical stimuli associated with the battery pack based on the pulled gases and/or particulates
Data Source
AI summary
Disclosed herein is a sensing system that comprises a sensor positioned inside an enclosure of a battery pack, a fan positioned in a vicinity of the sensor, a plurality of tubes each connected between the fan and the battery pack, and a control unit connected to the fan and the sensor. The control unit is configured to control the fan to pull, through the plurality of tubes, gases and/or particulates generated in the battery pack, and control the fan to throw the pulled gases and/or particulates onto the sensor. The sensor is configured to detect a change in one or more physical stimuli associated with the battery pack based on the pulled gases and/or particulates. Thereafter, the control unit is configured to detect an occurrence of a thermal runaway event in the battery pack based on the detected change in the one or more physical stimuli.