Flexible Cell Monitoring Circuits for Thermal Runaway Detection
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Solution Overview
Problem
Existing battery management systems are vulnerable to thermal runaway and other safety issues due to lack of real-time monitoring at the individual battery cell level, which can lead to dangerous events such as rapid temperature rises during charging or physical shocks.
Innovation Solution
A battery cell monitoring system integrated onto a flexible substrate, comprising sensors and a computing device that generates status data by comparing real-time sensor signals with characteristic data values, enabling early detection of potential threats and controlling battery operations to prevent such events.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery management systems use traditional monitoring approaches, then system simplicity is maintained, but safety and reliability deteriorate due to lack of real-time cell-level monitoring
Solution Approach 1:
The patent divides the battery management system into individual cell-level monitoring units, each equipped with sensors and computing devices that independently monitor specific battery cells. This segmentation enables real-time detection of thermal and electrical anomalies at the cell level, significantly improving safety and reliability without requiring a completely complex centralized system.
Solution Approach 2:
The system performs preliminary monitoring and analysis of battery cell parameters using characteristic data values and sensor signals before dangerous conditions develop. By continuously comparing real-time measurements against predetermined thresholds and patterns, the system can detect early signs of thermal runaway or electrical faults and trigger preventive actions before safety issues arise.
2Measurement precision
If real-time sensor monitoring is implemented at battery cell level, then detection precision is improved, but device complexity increases due to integration of multiple components
Solution Approach 1:
The patent combines multiple monitoring functions into integrated circuit boards that are directly mounted on battery cells. Sensors for temperature, voltage, and other parameters are merged with computing devices and communication interfaces on the same substrate, enabling precise real-time measurement while reducing the overall number of discrete components and simplifying system architecture.
Solution Approach 2:
The monitoring system utilizes flexible circuit boards or thin film substrates that can be conformally attached to battery cell surfaces. This approach enables precise sensor placement for accurate measurement while maintaining a compact, low-profile structure that does not add significant bulk or complexity to the battery cell design.
3Measurement precision
If characteristic data values are stored in computing devices for comparison, then measurement precision is improved, but use of energy increases due to continuous data processing
Solution Approach 1:
The computing devices perform data comparison and analysis at periodic intervals rather than continuously, reducing energy consumption while maintaining adequate monitoring precision. Sensor signals are sampled and compared against characteristic data values at predetermined time intervals, allowing the system to balance accuracy requirements with power conservation in battery-operated monitoring units.
Solution Approach 2:
The monitoring system uses the battery cell's own operational parameters and characteristic data values to perform self-diagnosis and status assessment. By comparing real-time sensor readings against pre-stored characteristic values that represent normal operation ranges, the system can autonomously determine cell health status without requiring external reference systems or additional energy-intensive calibration procedures.
Data Source
AI summary
Battery cell monitoring systems comprising a flexible substrate and components integrated onto the flexible substrate, and methods of operating the same are disclosed. The components comprise a computing device and at least one sensor, where the at least one sensor is configured to generate sensor signals indicative of a physical state of the battery cell. The computing device is configured to hold characteristic data values which have been generated based on prior sensor signals. The computing device is configured to receive the sensor signals from the at least one sensor and to generate battery cell status data in dependence on the sensor signals and the characteristic data values.