Electric vehicle power battery box liquid leakage control system and control method

Abstract

The invention relates to an electric vehicle power battery box liquid leakage control system and a control method. The power battery box liquid leakage control system comprises a liquid leakage detection device, a temperature sensor, a gas concentration parameter processor, a displayer, a battery relay and a whole-vehicle driving controller, wherein the liquid leakage device is used for detectingvoltage signals which change along with change of a gas concentration; the temperature sensor is used for detecting temperature signals in the power battery box; the gas concentration parameter processor is used for receiving the temperature signals and the voltage signals, finding out a current gas concentration value according to the temperature signals and the voltage signals, calculating according to the current gas concentration value and the last gas concentration value, judging whether alarm signals are sent according to a gas concentration change rate and sending power failure signalsor power reducing signals; the displayer is used for receiving and displaying alarm signals; the battery relay is used for receiving the power failure signals and cutting off power supply of a power battery; the whole-vehicle driving controller is used for receiving the power reducing signals to reduce power supply of the power battery. The liquid leakage control system and the method disclosed bythe invention can judge whether liquid leakage happens to the power battery by detecting the gas concentration and take corresponding measures.

Description

technical field [0001] The invention relates to the field of electric vehicle power batteries, in particular to an electric vehicle liquid leakage detection device, a control system and a control method. Background technique [0002] The electric vehicle power battery provides the power source for the electric vehicle, which mainly includes: battery cover, positive electrode, diaphragm, negative electrode, organic electrolyte, and battery case. Electric vehicle power batteries are usually lithium batteries. [0003] However, at present, the burning of lithium batteries can easily lead to the danger of electric vehicles and drivers. The main reason for the burning of lithium batteries is: the power battery is vibrated and collided, the battery case leaks, the electrolyte flows out, an oxidation reaction occurs, and metal lithium is precipitated. In contact with air, combustion occurs. The electrolyte consists of three parts: lithium salt, organic solvent and additives. When ...

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Problems solved by technology

[0003] However, at present, the burning of lithium batteries can easily lead to the danger of electric vehicles and drivers. The main reason for the burning of lithium batteries is: the power battery is vibrated and collided, and the battery case leaks, which leads to the outflow of electrolyte, oxidation reaction, and the precipitation of metal lithium. In contact with air, combustion occurs. The electrolyte consists of three parts: lithium salt, organic solvent and additives. When the battery case leaks, the organic solvent volatilizes. Conventional organic solvents include alkyl carbonates, ethers, and esters. At this time , the battery box is filled with volatile organic gas

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