Vehicle-mounted high voltage insulation detection device and method

Abstract

The invention relates to a vehicle-mounted high voltage insulation detection device which comprises an MCU unit, a high voltage insulation detection circuit, a high voltage diagnostic circuit and an isolating CAN unit, wherein the isolating CAN unit, the high voltage insulation detection circuit and the high voltage diagnostic circuit are connected to the MCU unit; the high voltage insulation detection circuit is connected to two ends of the to-be-detected battery pack; the high voltage diagnostic circuit is connected to two ends of a to-be-detected high voltage apparatus; and the MCU unit collects the voltages of the to-be-detected battery pack and / or the to-be-detected high voltage apparatus and the voltages are transmitted to a BMS master control unit through the isolating CAN unit.

Description

technical field [0001] The invention relates to the field of vehicle battery detection, in particular to a vehicle-mounted high-voltage insulation detection device and method. Background technique [0002] Since the power source of the car in the electric car is the power battery, it is different from the traditional car in that it uses high voltage ranging from 300V to 700V to supply power for the vehicle power system and air conditioning and other systems. From the perspective of electrical safety, the high-voltage system must be electrically isolated from the low-voltage system (including the body), and there are national standards for insulation performance. If the insulation performance of the high-voltage and low-voltage system decreases, it will cause bodily harm to the vehicle and the occupants. Therefore, it is of great significance to perform high-voltage sampling and diagnosis of high-voltage components on the power battery, as well as sampling the insulation resi...

AI Technical Summary

Problems solved by technology

[0004] The existing problems in the existing technology include: a single function, which can only realize current or insulation resistance or voltage sampling; no coding output function, which requires the BMS main control unit to do secondary judgment or calculation; scattered functions, which need to consider installation, design, maintenance, etc. Many factors, or the function is concentrated in the BMS main control unit, resulting in the high design cost of the BMS main control unit, complex circuits, and the coexistence of high and low voltage on one circuit board, which has certain potential safety hazards

Most of the insulation resistance measurement and high voltage detection are integrated on the BMS main control board, or only the insulation resistance detection has no other functions when using independent unit measurement, such as CN201710316037.9, "A Electric Vehicle Battery Pack Insulation Resistance Detection System , Method and Electric Vehicle" program only gives the measurement method of insulation resistance, and this method is integrated in the main control unit, without multiple functions such as diagnosis, communication, and coding.

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