Power battery thermal runaway detection and early warning system

Abstract

The invention provides a power battery thermal runaway detection and early warning system. The system comprises a battery management system, and a plurality of temperature sensors, a plurality of voltage detection circuits, a flame sensor, an air pressure sensor, a smoke sensor and a fire extinguisher which are respectively connected with the battery management system, wherein each of a plurality of temperature sensors is coupled with a corresponding battery tab; each of a plurality of voltage detection circuits is coupled with a positive electrode and a negative electrode of the corresponding battery; the smoke sensor, the flame sensor, the pressure sensor and the small fire extinguisher are all arranged in a battery box; and the battery management system receives detection signals detected by a plurality of temperature sensors, a plurality of voltage detection circuits, the flame sensor, the air pressure sensor and the smoke sensor, and calculates and judges whether thermal runaway management is triggered or not according to the detection signals.

Description

technical field [0001] The invention relates to a power battery, in particular to thermal runaway monitoring, early warning and fire extinguishing management of the power battery. Background technique [0002] In order to reduce air pollution and reduce carbon dioxide emissions, the country is vigorously developing the new energy vehicle industry. New energy vehicles are mainly driven by power batteries. Ternary lithium-ion power batteries have high specific energy density and good low temperature characteristics, and have been widely used in new energy vehicles. [0003] With the expansion of the number of new energy vehicles, a certain number of new energy vehicle spontaneous combustion incidents occur every year. Many new energy vehicle fires are related to power batteries. Power battery thermal runaway refers to the phenomenon of overheating, fire, and explosion caused by the rapid change of the self-temperature rise rate of the battery due to the heat release chain re...

AI Technical Summary

Problems solved by technology

Because the power battery is usually composed of hundreds of cells, usually several cells share a temperature point, so the temperature sensor cannot accurately detect the temperature rise

There will also be a delay in voltage detection, so the existing detection methods cannot effectively detect the occurrence of thermal runaway in advance

Moreover, after the thermal runaway is detected, there is no effective way to prevent the occurrence of thermal runaway

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