Battery Vent Valve Sensing for Trace Gas Thermal Runaway Warning
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Solution Overview
Problem
Conventional analyte sensors are unable to detect relatively low concentrations of chemicals, such as those released from batteries, which limits their applicability in preventing potential thermal runaway and explosions.
Innovation Solution
A battery safety system that includes a flow valve and a sensing device with a carbon-based sensor capable of detecting analytes through resonant impedance spectroscopy, allowing for early detection of hazardous gases and triggering alerts or remediation actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional analyte sensors are used, then the device complexity is low, but the measurement precision is insufficient for detecting low concentrations of analytes
Solution Approach 1:
The patent replaces conventional mechanical/chemical sensor systems with an acoustic resonance-based detection system. The sensing device uses acoustic resonators that change their resonant frequency or quality factor when exposed to analytes, enabling detection of concentrations below 1 ppb through acoustic property changes rather than traditional chemical or electrical measurements
Solution Approach 2:
The patent changes the detection parameter from conventional electrical or chemical signals to acoustic resonance parameters (frequency, quality factor). By monitoring changes in acoustic resonance characteristics of the sensing material when analytes are present, the system achieves ultra-low concentration detection with enhanced precision
2Reliability
If conventional sensors are used, then the device complexity is low, but the reliability of detecting early thermal runaway signs is insufficient
Solution Approach 1:
The patent implements preliminary detection by positioning the sensing device to monitor analytes before thermal runaway occurs. The acoustic resonance sensor detects trace analyte concentrations in the headspace that precede thermal runaway events, providing early warning that enables preventive action before the battery enters a dangerous state
Solution Approach 2:
The patent introduces acoustic resonance as an intermediary detection mechanism between the analytes and the detection system. The acoustic resonator acts as a mediator that amplifies the presence of trace analytes through measurable changes in resonance characteristics, enabling reliable early detection without requiring direct contact with or high concentrations of the analytes
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 analytes at concentrations below 1 part per billion, providing sufficient warning for users to mitigate potential battery failures and preventing thermal runaway events.
Implementation Method 1
the sensing device may include a sensing material configured to resonate at a frequency in response to an electromagnetic signal received from an external device
Implementation Method 2
detection of the presence of the one or more analytes may be based at least in part on a frequency response of the sensing material to the electromagnetic signal
Data Source
AI summary
A battery safety system includes a flow valve and a sensing device. The flow valve is disposed on a housing of the battery and includes a first valve that is embedded inside the housing and a second valve that intersects the housing. The first valve includes a cavity through which analytes released upon electrochemical reactions within the battery flow towards the second valve. The second valve extends through the housing to the outside, and defines an opening through which the released analytes exit the housing. The sensing device is disposed within the cavity of the first valve of the valve and is situated in a manner to be in fluidic contact with the released analytes as they flow from the inside of the battery to the outside. In some aspects, the battery safety system can detect a minute presence of one or more analytes.