SAFETY PREVENTION AND CONTROL SYSTEM AND CONTROL METHOD OF POWER BATTERY PACK FOR ELECTRIC VEHICLE

The present application relates to a safety prevention and control system and control method of a power battery pack for an electric vehicle. The safety prevention and control system of a power battery pack includes a signal acquisition device, a main controller, and a step-by-step prevention and control execution device. The main controller includes a fault diagnosis device, a cell thermal runaway determination device and a battery pack thermal runaway propagation determination device, which are respectively electrically connected to the step-by-step prevention and control execution device to send different control instructions to the step-by-step prevention and control execution device. The step-by-step prevention and control execution device can execute prevention and control actions of different levels according to the different control instructions sent by the fault diagnosis device, the cell thermal runaway determination device and the battery pack thermal runaway propagation determination device. The safety prevention and control system of a power battery pack for an electric vehicle can provide an active prevention and control measure and a passive prevention and control measure, and according to the actual situation of a specific accident and the prevention and control ability of the prevention and control system, accurately start a prevention and control mechanism, maximize a safety protection effect, and ensure the safety of an electric vehicle occupant.