Internal Battery Sensing for Early Thermal Runaway Warning
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Solution Overview
Problem
Current energy storage device safety monitoring technologies rely heavily on external sensors that lag behind internal changes, making it challenging to provide early warnings for thermal runaway risks, especially in batteries with small intervals between safety valve opening and thermal runaway, due to damage structures and interference from safety valves.
Innovation Solution
An energy storage device detection system and method that includes a sensing module and an analyzing module to acquire and analyze internal temperature and pressure changes, using optical and electrical sensors implanted inside the device to determine the state of the energy storage device and trigger warnings for irreversible, internal short circuit, safety valve opening, and thermal runaway states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If external sensors are used to monitor energy storage devices, then the device structure remains simple and easy to manufacture, but the response speed lags behind internal changes and early warning capability is insufficient
Solution Approach 1:
The patent implements implantable sensors that are nested inside the energy storage device structure. The sensors are integrated within the device housing, allowing direct contact with internal components for real-time monitoring of temperature, pressure, and other critical parameters, thereby achieving fast response without significantly increasing external device complexity
Solution Approach 2:
The patent employs early warning mechanisms that detect critical changes in internal parameters before thermal runaway occurs. By monitoring trends in temperature, pressure, and other parameters and comparing them against predetermined thresholds, the system triggers warnings in advance, enabling preventive action before catastrophic failure
2Measurement precision
If implantable sensors are used to acquire internal information, then early and precise warnings can be achieved, but the device structure becomes more complex and manufacturing difficulty increases
Solution Approach 1:
The patent designs multi-functional implantable sensors that can simultaneously monitor multiple parameters such as temperature, pressure, and other critical indicators. This consolidation reduces the number of separate sensor components needed, simplifying the manufacturing process while maintaining high measurement precision for early warning detection
Solution Approach 2:
The patent utilizes sensors that detect changes in physical parameters (temperature, pressure, etc.) within the energy storage device. By monitoring these parameter changes and comparing them against predetermined thresholds, the system achieves precise measurement and early warning capability without requiring overly complex manufacturing processes
3Reliability
If external acoustic and gas signals are used for monitoring, then the monitoring system remains simple, but the warning accuracy is significantly affected by safety valve opening
Solution Approach 1:
The patent uses implantable sensors as intermediaries that directly measure internal parameters within the energy storage device. These sensors are positioned to detect temperature, pressure, and other critical changes before they manifest as external acoustic or gas signals, providing reliable warning information that is not affected by safety valve opening or other external interference
Data Source
AI summary
A method for detecting a state of an energy storage device (e.g. lithium-ion battery) is provided, which includes acquiring at least one of a change signal of a temperature or a change signal of a pressure inside the energy storage device, and determining the state of the energy storage device based thereon. The method may further include triggering a warning when the state of the energy storage device meets a preset condition, such as when the energy storage device is determined to be in an irreversible state, an internal short circuit state, a safety valve opening state, or a thermal runaway state. A detection device implementing the detection method is also provided, which comprises a sensing module and an analyzing module. The sensing module is arranged at an interior position of the energy storage device, and can include an optical sensor and/or an electrical sensor.