Power battery pack safety preventing and controlling system for electric vehicle

Abstract

The invention relates to a power battery pack safety preventing and controlling system for an electric vehicle. The power battery pack safety preventing and controlling system comprises a signal collecting device, a main controller and a stepwise preventing and controlling executor. The main controller comprises a fault diagnosis device, a single thermal runway judging device and a battery pack thermal runway spreading judging device which are electrically connected with the stepwise preventing and controlling executor separately and send different control instructions to the stepwise preventing and controlling executor. The stepwise preventing and controlling executor can execute different levels of preventing and controlling motions according to different control instructions sent by thefault diagnosis device, the single thermal runway judging device and the battery pack thermal runway spreading judging device. By means of the power battery pack safety preventing and controlling system for the electric vehicle, an active preventing and controlling measure and a passive preventing and controlling measure can be provided, a preventing and controlling mechanism can be accurately started in combination with the preventing and controlling capability of the preventing and controlling system aiming at actual situations of specific accidents, the safety protecting effect is maximized, and the passenger safety of the electric vehicle is guaranteed.

Description

technical field [0001] The invention relates to the technical field of electric vehicles and batteries, in particular to a safety prevention and control system for power battery packs used in electric vehicles. Background technique [0002] Electric vehicles are the main body of new energy vehicles, and power batteries are the core energy source of electric vehicles. Power batteries generally need to be grouped to meet the driving needs of electric vehicles. The vehicle power battery pack should be equipped with a safety prevention and control system to ensure the safety of the vehicle power battery pack during use. [0003] Generally, safety accidents of electric vehicles are characterized by multi-stages. The first stage is that the battery system fails, which causes the thermal runaway of the battery cells; the second stage is that the battery cells in the battery system have thermal runaway, and Local fires may occur; the third stage is the spread of thermal runaway in...

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a power battery pack safety prevention and control system for electric vehicles in view of the problems that traditional technical solutions cannot actively and directly monitor the faults of the battery system of electric vehicles, and cannot comprehensively improve the safety of electric vehicle battery packs.

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