Awakening electric shock prevention device for electric vehicle

Abstract

The invention provides an awakening electric shock prevention device for an electric vehicle, which comprises an on-off module and a starting module, wherein the on-off module is used for grouped on-off of high-voltage power storage batteries of the electric vehicle, an output end of the on-off module is connected to the high-voltage power storage batteries of the electric vehicle, the starting module is used for starting and controlling the on-off module, an output end of the starting module is connected with an input end of the on-off module, and the starting module is provided with an awakening device for providing awakening voltage for the starting module. The awakening electric shock prevention device for the electric vehicle enables grouped on-off of the high-voltage power storage batteries of the electric vehicle, and the voltage of each high-voltage power storage battery group is the safety voltage for a human body, so that danger of high-voltage electric shock of staff in production and maintenance is reduced, and when the vehicle runs, the high-voltage power storage battery groups can be quickly connected together by the awakening electric shock prevention device for the electric vehicle, so that the high-voltage power supply requirement of the complete vehicle is met.

Description

technical field [0001] The invention relates to an electric shock protection device, in particular to a wake-up type electric shock protection device for an electric vehicle. Background technique [0002] In addition to the performance of electric vehicles, how to take into account the safety of users has become an important issue; because the power system of electric vehicles is different from that of traditional internal combustion engine vehicles, in addition to the general safety requirements of electric vehicles, there are special regulations for their electrical safety protection , the vehicle design process must meet the specification requirements to avoid potential risks of electric vehicles and ensure the safety of use. [0003] Compared with traditional internal combustion engine vehicles, the focus of attention on the safety of electric vehicles is also different. The first is whether the power source of electric vehicles-the high-voltage battery pack will cause t...

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Problems solved by technology

[0003] Compared with traditional internal combustion engine vehicles, the focus of attention on the safety of electric vehicles is also different. The first is whether the power source of electric vehicles-the high-voltage battery pack will cause the risk of electric shock to personnel. At present, the main power switch, key The switch is used to cut off the connection between the positive pole of the vehicle battery pack and the input power terminals of other electrical components, while the high-voltage battery pack remains completely connected, so there are the following disadvantages: 1. During the production process, with the continuous development of high-voltage multiple battery packs When the total voltage of the high-voltage battery packs connected in series exceeds the safe voltage value, the production personnel are prone to the danger of electric shock; second, if water enters the electric vehicle during driving, if the original high-voltage battery packs cannot be disconnected in time Open, the people in the car may easily cause electric shock hazards; third, during the maintenance of electric vehicles, due to electromagnetic compatibility problems, the electric components such as motor controllers, DC / DC, chargers, and air-conditioning controllers used in the car are all in the power supply. The positive and negative poles of the input terminal are respectively connected to the car body with a common-mode capacitor, so that the uncharged chassis is electrified. Although the voltage carried will not directly cause life danger, it will easily cause numbness in the hands of the car crew and cause psychological tension; The electric vehicle adopts the high-voltage power supply system of the high-voltage battery pack and the 12V low-voltage power supply system. The negative pole of the high-voltage battery pack must not have any connection with the electric chassis. The existence of the common-mode capacitor connects the high-voltage battery pack power supply system with the 12V low-voltage power supply system. Although there is only voltage on the common-mode capacitor in a steady state and no current passes through it, when people or other conductive objects touch the common-mode capacitor, It will break the balance and form a loop. At this time, a current will be generated to affect the safety of personnel. However, in order to meet the electromagnetic compatibility of electric vehicles, the common mode capacitor cannot be canceled

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