Battery Thermal Runaway Detection with Sensor Validity Switching
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Solution Overview
Problem
Existing battery systems face challenges in detecting thermal runaway, particularly when internal temperature measurements are unreliable due to communication errors or sensor failures, which can lead to missed detections and safety risks.
Innovation Solution
A thermal runaway detecting device comprising a first measuring module for temperature and voltage measurements, a second measuring module for output voltage monitoring, and a controller that determines detection validity and selectively uses temperature or voltage data to detect thermal runaway, ensuring redundancy in detection methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature sensors are used to detect thermal runaway, then detection precision is improved, but reliability deteriorates due to communication errors and sensor failures
Solution Approach 1:
The system performs preliminary self-diagnosis on temperature sensors and communication modules before thermal runaway detection. The control unit checks whether temperature values are within expected ranges and whether communication is functioning properly, preventing false detections due to sensor failures or communication errors.
Solution Approach 2:
The patent introduces voltage detection as an intermediary method between temperature sensors and thermal runaway determination. When temperature data is found to be unreliable through self-diagnosis, the system switches to voltage-based detection, which does not depend on temperature sensor functionality or communication module status.
2Reliability
If multiple measurement modules are added for redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions: it processes temperature data for thermal runaway detection, conducts self-diagnosis on temperature sensors, monitors communication module status, and executes voltage-based detection. This multi-functionality eliminates the need for separate dedicated modules for each function, maintaining reliability while controlling complexity.
Solution Approach 2:
The system performs self-diagnosis on its own measurement modules and communication systems. The control unit automatically detects sensor failures and communication errors, and switches detection methods without external intervention, ensuring continuous reliable operation.
3Measurement precision
If temperature-based detection is used exclusively, then measurement precision is improved, but adaptability deteriorates when sensors fail
Solution Approach 1:
The detection system dynamically switches between temperature-based and voltage-based detection methods based on real-time self-diagnosis results. When temperature sensors or communication modules are detected as faulty, the system automatically transitions to voltage detection, maintaining adaptability while preserving measurement precision through the appropriate method.
Data Source
AI summary
A thermal runaway detecting device for a battery system including a plurality of cells, including: a first measuring module for measuring temperature values of the plurality of cells via at least one temperature sensor; a second measuring module for measuring an output voltage value of the battery system; and a controller for determining validity of a temperature-based detection of thermal runaway by monitoring data received from the first measuring module, and detecting a thermal runaway of the battery system by selectively monitoring the temperature values or the output voltage value according to a result of the determining of validity of the temperature-based detection of thermal runaway.