Battery Pack Thermal Runaway Detection via Circuit Break
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Solution Overview
Problem
Current battery packs face challenges in accurately detecting thermal runaway, leading to potential false signals and safety mishaps due to the limited scope of temperature monitoring within the battery module.
Innovation Solution
A battery pack design incorporating multiple battery modules with explosion-proof valves and a thermal alarm device connected to a battery management system, which triggers a circuit break upon thermal runaway, ensuring accurate detection and alarm signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature is only collected inside a battery module, then the monitoring scope is limited, but false signals occur leading to misjudgment
Solution Approach 1:
The invention divides the temperature monitoring system into multiple independent detection points: internal temperature sensors within battery modules and external temperature sensors positioned at battery pack boundaries. Each sensor independently monitors its local environment, allowing the system to distinguish between localized heating and genuine thermal runaway events, thereby reducing false alarms while maintaining detection accuracy.
Solution Approach 2:
The invention introduces external temperature sensors as intermediary detection elements positioned between the internal battery modules and the external environment. These sensors act as mediators that detect heat propagation from the outside in, providing an additional verification layer that helps distinguish genuine thermal runaway from internal sensor errors or localized anomalies.
2Measurement precision
If multiple temperature sensors are added inside and outside battery modules, then thermal runaway detection accuracy improves, but device complexity increases
Solution Approach 1:
The monitoring system is segmented into two independent but complementary subsystems: internal temperature monitoring within battery modules and external temperature monitoring at pack boundaries. This segmentation allows each subsystem to use simple, dedicated sensors without requiring complex integrated systems, reducing overall device complexity while maintaining high detection accuracy through the combination of both subsystems.
Solution Approach 2:
The temperature sensors serve multiple functions: they monitor normal operating temperatures, detect thermal runaway events, and provide data for battery management system optimization. By designing the sensing system to be multi-functional, the patent avoids adding separate specialized devices for each function, thereby controlling device complexity while achieving comprehensive monitoring capabilities.
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
This design enhances safety by providing timely and accurate reflection of thermal runaway status, reducing the risk of false alarms and improving overall battery safety through precise monitoring and alert mechanisms.
Implementation Method 1
when thermal runaway occurs in the battery module, a circuit break of the thermal alarm device is caused, thus the thermal runaway status of the battery pack can be accurately reflected
Data Source
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AI summary
The present application relates to the field of energy storage devices, and in particular to a battery pack. The battery pack comprises: two or more battery modules, each of the battery modules comprising a plurality of battery cells which are stacked in sequence, wherein each of the battery cells is provided with an explosion-proof valve; the battery pack further comprising a thermal alarm device and a battery management system, wherein the thermal alarm device is arranged corresponding to the explosion-proof valve; the thermal alarm device and the battery management system are connected to form a circuit; and a break of the circuit can be caused when the explosion-proof valve is exploded. The present application provides the thermal alarm device to correspond to the explosion-proof valve, and when thermal runaway occurs in the battery module, a circuit break is formed between the thermal alarm device and the battery management system, thus the thermal runaway status of the battery pack can be accurately reflected, and the safety of the battery is enhanced.