Electric automobile battery module thermorunaway safety fire extinguishing system and method

Abstract

The invention discloses an electric automobile battery module thermorunaway safety fire extinguishing system. The electric automobile battery module thermorunaway safety fire extinguishing system comprises battery cells (9), a housing (8), a liquid storage tank (4), fire protection valves (2), temperature sensors (5), pressure sensors (6), and a controller (1); a plurality of the battery cells (9) are connected in parallel so as to form a battery unit, and a plurality of the battery units are connected in parallel so as to form a battery module; fire-proof materials (7) are arranged in the housing (8) at equal intervals; the liquid storage tank (4) is used for cooling the battery module; the fire protection valves (2) are used for controlling flowing of liquid; the temperature sensors (5) and the pressure sensors (6) are used for monitoring the temperature and gas signals of the battery module, and sending the temperature and gas signals to the controller; and the controller (1) is used for controlling opening and closing of the fire protection valves (2) based on the temperature and gas signals so as to cool the battery module and inhibit battery cell thermorunaway. The invention also discloses a fire extinguishing method using the electric automobile battery module thermorunaway safety fire extinguishing system. The electric automobile battery module thermorunaway safety fire extinguishing system and the fire extinguishing method are capable of inhibiting thermorunaway of the battery module effectively, and are high in automation degree.

Description

technical field [0001] The invention belongs to the field of new energy and environmental protection industries, and more specifically relates to a thermal runaway safety fire protection system and method for an electric vehicle battery module. Background technique [0002] Modern electric vehicle power batteries generally use lithium batteries, and the types of lithium batteries used in electric vehicles are mainly cylindrical 18650 batteries and soft-pack polymer batteries. With the development of the new energy vehicle industry, people's demand for the mileage of lithium batteries has also become higher and higher. Under a certain quality, increasing the cruising range of electric vehicles requires increasing the energy density of the lithium battery itself. With the improvement of the energy density of the battery cell, it is becoming more and more difficult to guarantee the thermal stability of the battery, because there are more and more accidents of fire and explosio...

AI Technical Summary

Problems solved by technology

[0005] (1) The thermal runaway blocking structure of the battery module only separates the battery module with a simple heat insulating material, but does not point out how to reduce the risk of thermal runaway of the battery pack;

[0006] (2) There is no component involved in thermal management in the thermal runaway blocking structure of the battery module;

[0007] (3) The thermal runaway blocking structure of the battery module does not point out how to suppress the thermal runaway after the thermal runaway of the battery pack occurs, nor does it point out how to fire

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