Battery Vent Sealing Detection for Thermal Runaway Warning
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Solution Overview
Problem
Current thermal runaway detection systems in battery modules primarily detect secondary effects such as voltage, current, and temperature changes, rather than the thermal runaway itself, leading to potential false warnings and inadequate protection, as these measurements can be impaired by thermal propagation and are not universally applicable across different battery geometries.
Innovation Solution
A thermal runaway detection system incorporating a venting device with a sealing body that opens to release gases during abnormal pressure conditions, monitored by a detection circuit that outputs signals based on the sealing body's position, allowing for direct detection of thermal runaway independent of internal battery measurements, with a reversible design to prevent false warnings and enable reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal cell measurements (voltage, current, temperature) are used for thermal runaway detection, then the detection system can identify abnormal conditions, but the detection may produce false warnings and is impaired by thermal propagation
Solution Approach 1:
The patent extracts the detection function from internal cell measurements and relocates it to external pressure monitoring. The venting device with sealing body is positioned outside the battery cell, monitoring pressure changes in the surrounding environment rather than internal electrical parameters. This extraction eliminates the interference of thermal propagation on measurement accuracy while maintaining reliable thermal runaway detection capability.
2Adaptability or versatility
If trigger thresholds are set based on specific battery system models to avoid false warnings, then false warnings are reduced, but the system is not universally applicable across different battery geometries
Solution Approach 1:
The patent implements a universal detection mechanism based on pressure monitoring that applies to all battery geometries. The venting device with sealing body monitors pressure changes in the external environment, which is a universal physical phenomenon regardless of battery shape or internal configuration. This eliminates the need for geometry-specific calibration while maintaining reliable detection without false warnings.
3Reliability
If a venting device with sealing body is used to directly detect thermal runaway, then detection reliability is improved and false warnings are reduced, but the device complexity increases
Solution Approach 1:
The patent merges the detection function with the existing venting device structure. The sealing body that already serves to close the venting passage is integrated with detection circuitry to simultaneously perform sealing and detection functions. This combination eliminates the need for separate detection components, reducing overall device complexity while improving reliability through direct thermal runaway detection.
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 immediate and reliable detection of thermal runaway, reducing the risk of false warnings and allowing for timely countermeasures, as the system directly monitors pressure changes within the battery module, providing a quick response to venting events and protecting against overheating.
Implementation Method 1
A thermal runaway detection system incorporates a venting device with a sealing body that opens to release gases during abnormal pressure conditions
Implementation Method 2
monitored by a detection circuit that outputs signals based on the sealing body's position
Data Source
AI summary
A thermal runaway detection system includes: a venting device including a sealing body in a venting passage and a thermal runaway detection circuit. The sealing body being configured to close the venting passage in a first position and to open the venting passage in a second position different from the first position. The thermal runaway detection circuit being configured to monitor a position of the sealing body and to output a signal corresponding to the position of the sealing body.