Safety monitoring and controlling method for li-ion power battery thermorunaway and device thereof

Abstract

The invention discloses a safety monitoring and controlling method for li-ion power battery thermorunaway and a device thereof. When a li-ion power battery suffers from thermorunaway, a composite medium with cooling and fire-extinguishing effects is used as a safety monitoring and controlling medium to enter a power battery box or battery tank in an injection mode. The safety monitoring and controlling medium is composed of chemical substances which are formed by C, F, H and O elements and have cooling and fire-extinguishing effects. A li-ion battery safety monitoring and controlling device based on the above safety monitoring and controlling method comprises a shell and a safety monitoring and controlling medium filling port, a pressure meter connector, a nozzle and a safety valve pressure relief opening which are arranged on the shell. The safety monitoring and controlling device can effectively prevent or reduce the li-ion battery thermorunaway risk, reduce fire probability of the li-ion battery box (tank), control and extinguish initial fire, and has functions of starting operation for many times and extinguishing re-ignited fire of the power battery box.

Description

Technical field [0001] The invention relates to a safety prevention and control method and device, in particular to a prevention and control method and device for preventing or reducing the risk of thermal runaway of a lithium ion battery. Background technique [0002] Currently, lithium-ion batteries have been widely used in military and civilian applications such as mobile phones, electric vehicles, and ships. Due to inevitable manufacturing defects and other internal and external reasons, lithium-ion batteries often suffer from thermal runaway, leading to accidents such as combustion and explosion. In particular, lithium-ion power batteries used in vehicles and ships have a large number of single batteries and complex assembly and connection methods. In the power battery compartment of large battery buses, the number of lithium-ion batteries is often more than 5,000. The probability of thermal runaway of single lithium-ion battery is generally more than five parts per million...

AI Technical Summary

Problems solved by technology

Due to the large amount of dust in the dry powder fire extinguishing device, the battery box and the battery compartment will be seriously polluted when the fire is extinguished

Aerosol is a multi-phase mixed fire extinguishing agent, which is highly corrosive and conductive, and will cause a short circuit of the power battery. At the same time, as a combustion-type fire extinguishing method, it will aggravate the thermal damage of the battery box or battery compartment

N 2 , CO 2 Such inert gases need to work under relatively high pressure. The fire extinguishing device and system belong to the category of medium and high pressure containers. There are potential safety hazards in the process of vehicle movement and daily duty processing. At the same time, the volume is generally large and requires a large space, which is not suitable for for electric vehicles

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