Improved electric automobile power cell insulation detection system and method

Abstract

The invention relates to an improved electric automobile power cell insulation detection system and method. The system is characterized by comprising a normally-opened relay K0 and a bias resistor R connected in series between a positive bus of a cell and a chassis, a normally-opened relay K1 and a bias resistor R are connected in series between a negative bus of the cell and the chassis, one ADC sampling channel of an STM32 high performance single-chip microcomputer is used for acquiring a voltage value U0 between the positive bus of the cell and the chassis through a voltage reduction unit, and another ADC sampling channel of the STM32 high performance single-chip microcomputer is used for acquiring a voltage value U1 between the negative bus of the cell and the chassis through a polarity conversion unit and the voltage reduction unit. The invention further provides an insulation detection method based on the improved electric automobile power cell insulation detection system. The system is advantaged in that when insulation performance of an electric automobile decreases, timely alarm can be realized, and thereby safety of the electric automobile is improved.

Description

technical field [0001] The invention relates to a power battery insulation detection system and a detection method using the system, in particular to a novel bridge-based electric vehicle insulation detection system and detection method. Background technique [0002] In order to solve global problems such as environmental pollution and oil crisis, pure electric vehicles have been developed rapidly. Pure electric vehicles generally use batteries as power batteries, and the voltage of the battery pack is usually above 200V, which is far beyond the safe range that the human body can bear. During the daily use of pure electric vehicles, harsh environments such as humidity, vibration, and sun exposure can easily cause aging and cracking of the high-voltage wiring harness of the battery, thereby reducing the insulation safety of the vehicle. When the positive and negative bus bars of the battery and the car body leak electricity, it will directly endanger the personal safety of t...

AI Technical Summary

Problems solved by technology

During the daily use of pure electric vehicles, harsh environments such as humidity, vibration, and exposure to the sun can easily cause aging and cracking of the high-voltage wiring harness of the battery, thereby reducing the insulation safety of the vehicle

When the positive and negative bus bars of the battery leak electricity from the car body, it will directly endanger the personal safety of the driver and passengers

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