Electric vehicle thermal runaway early warning system, control method and electric vehicle

Abstract

The invention provides an electric vehicle thermal runaway early warning system, a control method and an electric vehicle. The thermal runaway early warning system for the electric vehicle comprises an optical fiber, a light source emitter, a light source receiver, a thermal runaway detection system controller, an alarm system, a first beam splitter arranged between the light source emitter and the input end of the optical fiber, a detector arranged on an optical signal reflection path of the first beam splitter, a second beam splitter arranged between the optical fiber output end and the light source receiver, and an optical filter and a light source receiver are arranged on an optical signal output path. The optical fiber is arranged close to the outer surface of the battery module or the battery cell, or at least part of the optical fiber is in contact with the outer surface of the battery module or the battery cell; the input end of the optical fiber is connected with the light source emitter, and the output end of the optical fiber is connected with the light source receiver; and the temperature of the battery cell is accurately monitored, and early warning is performed before the thermal runaway of the electric vehicle spreads, so that personal and property safety is protected.

Description

technical field [0001] The invention relates to the field of early warning and monitoring of thermal runaway of an electric vehicle, in particular to a thermal runaway early warning system of an electric vehicle, a control method and the electric vehicle. Background technique [0002] With the development of technology and the promotion of national policies, electric vehicles have been widely used in my country. However, due to the frequent spontaneous combustion accidents of electric vehicles in recent years, the problem of thermal runaway of electric vehicles has been highly valued, and the instability of the chemical composition of power batteries is the main factor causing the problem. Internal short circuit of the battery pack, improper use of the battery, manufacturing defects or exposure of the battery to extreme high temperatures may cause thermal runaway. The inside of the battery pack usually releases a large amount of smoke and heat as well as burning liquid electr...

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Problems solved by technology

[0004] Embodiments of the present invention provide an electric vehicle thermal runaway warning system, a control method, and an electric vehicle, which are used to solve the problem of frequent thermal runaway of electric vehicles caused by inaccurate and untimely monitoring and judgment of battery pack or battery temperature status in the prior art The problem

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