Automatic fire extinguishing device of power battery system of new energy automobile based on multi-source information detection and control method

Abstract

The invention discloses an automatic fire extinguishing device of a power battery system of a new energy automobile based on multi-source information detection and a control method. The automatic fireextinguishing device is internally provided with a controller, is connected to an integrated sensor to input data and is connected to an electromagnetic valve to output a command. The integrated sensor detects temperature data, gas data and smog data in a battery pack. The controller has two stage threshold values. When the thermorunaway state of a battery reaches the first stage threshold value,a manual alarm switch starts to alarm. When the thermorunaway state of the battery reaches the second stage threshold value, a general electromagnetic valve and thermorunaway corresponding branch electromagnetic valves are started. An extinguishant passes through a fire extinguishing bottle to extinguish a copper tube and arrives at a collector and a three-way valve and is finally conveyed to thebattery pack through a fire extinguishing pipe. The automatic fire extinguishing device has the advantages of high thermorunaway pre-judging precision, long-term early warning and efficient control.

Description

technical field [0001] The invention relates to the technical field of new energy vehicle power battery system safety, in particular to an automatic fire extinguishing device and control method for a new energy vehicle power battery system based on multi-source information detection. Background technique [0002] When lithium-ion batteries are working, as the internal complex electrochemical reactions proceed, heat will gradually accumulate. Once the separator ruptures, the positive and negative electrode materials will short-circuit internally, which will cause heat to be unable to be discharged in a short period of time, resulting in thermal runaway. At the same time, if a new energy vehicle is punctured or collided while driving, it will cause the lithium-ion battery diaphragm to rupture instantly and directly trigger thermal runaway. According to incomplete statistics, since 2015, there have been 74 accidents involving the combustion and explosion of lithium-ion batteri...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems existing in the prior art, the present invention provides an automatic fire extinguishing device and its control method for the power battery system of new energy vehicles based on multi-source information detection, so as to solve the problem that the power battery system cannot be warned in time after thermal runaway occurs under extreme working conditions. and control issues

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