Tiered Battery Gas Sensing for Early Thermal Runaway Detection
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Solution Overview
Problem
Existing battery health monitoring techniques face challenges in early detection of thermal runaway and are susceptible to contamination and external influences, limiting their effectiveness in automotive and industrial applications.
Innovation Solution
A gas monitoring system that utilizes a thermal property primary sensor to detect changes indicative of battery failure, triggering a secondary gas sensor to verify the presence of volatile gases, thereby providing early detection and reducing contamination risks through controlled temperature operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If metal oxide sensors are used to detect volatile gases for early battery failure detection, then detection timing is improved, but sensor longevity deteriorates due to contamination from continuous heating
Solution Approach 1:
The patent implements periodic action by switching the metal oxide sensor between active heating/detection phases and cooling/rest phases. The sensor is heated to operating temperature only when needed for detection, then cooled down to prevent contamination accumulation. This periodic on-demand heating maintains early detection capability while significantly extending sensor longevity by reducing continuous thermal exposure that causes contamination.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the heating temperature and duration of the metal oxide sensor based on battery risk assessment. When battery parameters indicate normal operation, the sensor operates at lower temperatures or remains inactive. When battery parameters suggest potential failure risks, the sensor is heated to full operating temperature for accurate detection. This adaptive parameter adjustment optimizes both detection timing and sensor longevity.
2Measurement precision
If pressure sensors are used to monitor battery compartment pressure, then detection capability is improved, but detection timing deteriorates due to pressure equalization vents masking slow pressure changes
Solution Approach 1:
The patent introduces gas composition analysis as an intermediary detection method that operates independently of the pressure equalization vent system. Instead of relying on pressure changes that are masked by the vent, the system uses metal oxide sensors to directly detect volatile gas compositions produced by battery failure. This intermediary approach bypasses the limitation of pressure-based detection and enables early timing detection unaffected by venting mechanisms.
3Reliability
If continuous sensor operation is maintained to ensure reliable detection, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic action by operating sensors on-demand rather than continuously. The system monitors battery parameters and activates sensors only when failure risks are detected or during scheduled check intervals. This periodic operation maintains detection reliability for critical events while dramatically reducing average power consumption compared to continuous operation.
Solution Approach 2:
The patent applies dynamics by making sensor operation adaptive and flexible rather than static and continuous. The system dynamically adjusts sensor activation based on real-time battery condition assessment, environmental factors, and risk levels. This dynamic approach ensures reliable detection when needed while optimizing power consumption by keeping sensors inactive during normal operating conditions.
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
Enables early detection of battery failure and thermal runaway, increasing sensor longevity and reducing false readings, while maintaining reliability and power efficiency.
Implementation Method 1
monitoring a thermal property of an atmosphere in a battery compartment for a change indicative of battery failure
Implementation Method 2
In operation, the heated metal oxide layer of a metal oxide sensor can become contaminated
Data Source
AI summary
A gas monitoring system can include a chemical concentration secondary gas sensor, with a conductive heater element, which can be heated to a standby temperature slightly above an ambient temperature level of a gaseous ambient environment. A thermal characteristic of the environment can be monitored by a thermal property primary sensor and configured to provide a triggering output in response to a physical characteristic of the conductive heating element meeting at least one criterion. In response to the triggering output, the heater is controllable to heat the chemical concentration secondary gas sensor to a secondary operating temperature at which the chemical concentration secondary gas sensor can detect the presence of a specified gas in the environment.