Thermorunaway detection and protection device and method of power battery pack of electric automobile

Abstract

The invention discloses a thermorunaway detection and protection device and method of a power battery pack of an electric automobile, and relates to the field of failure detection and safety protection of electric automobiles. The device mainly comprises a microcontroller, a temperature detection circuit, a voltage detection circuit, a thermorunaway protection circuit, a local area network transceiver and a thermorunaway protection plate. Through cooperation with a battery management system, a main positive relay, a main negative relay and a vehicle-mounted data terminal of the electric automobile, by means of the special control method and protection measures, when the thermorunaway risk exists in the power battery pack, an alarm is given immediately, after the thermorunaway phenomenon happens, protection measures can be taken for the battery pack in time, and therefore the accident risk is reduced, and equipment consumption is reduced.

Description

technical field [0001] The invention relates to the field of fault detection and safety protection of electric vehicles, in particular to a thermal runaway detection and protection device and method for a power battery pack of an electric vehicle. Background technique [0002] Due to the market demand for electric vehicles with longer cruising range, this will lead to higher and higher energy density of supporting power battery packs. The higher the energy density of the battery, the worse its chemical stability, and the more temperature and heat will accumulate during operation. If there is a problem with the heat dissipation of the battery pack cooling system, it is easy to achieve thermal runaway. Once this happens, it will directly threaten personal safety. If the thermal runaway phenomenon cannot be detected in real time before it occurs and dealt with in time after it occurs, on the one hand it will cause loss of the power battery pack; Serious problems bring danger t...

AI Technical Summary

Problems solved by technology

But these methods have disadvantages: the alarm type can only be alarmed when thermal runaway occurs, and at this time there is not much time left for the drivers and passengers on the car to escape; and the preventive type cannot be 100% preventive. Thermal runaway does not happen at all, as long as there is a probability to happen once, it can cause huge damage to the drivers and passengers in the car

Therefore, these methods are not conducive to reducing the potential safety hazards of driving, and are also not conducive to the promotion of the entire electric vehicle industry.

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