Control system and detection method for power battery relay of new energy vehicles

Abstract

The invention relates to a control system for a power battery relay of new energy vehicles. A pre-charge relay is connected in series with a pre-charge resistor, and then connected in parallel with atotal positive relay, and connected to a positive pole of a power battery; a total negative relay is connected to a negative pole of the power battery, and a voltmeter in a first voltage measuring device measures the voltage across the power battery; a voltmeter in a second voltage measuring device measures the voltage between the total positive relay and the total negative relay; the power battery outputs voltage outward, and the range of the voltage value depends on the battery design value and the current battery state, and a vehicle load is connected between the output voltages. An advantage of the present invention is that the system can properly respond to requests for closing and opening relays of a vehicle, and when the relay itself fails, the system is capable of identifying faults and reporting them under certain operating conditions.

Description

technical field [0001] The invention relates to the technical field of electronic control of new energy vehicles, in particular to a control system and a detection method for a relay of a power battery management system of a new energy vehicle. Background technique [0002] New energy vehicles are gradually transitioning from research and development to mass production, so higher requirements are put forward for the rational use of various components and timely detection of failures. New energy vehicles mainly include pure electric vehicles and hybrid vehicles, no matter which type of vehicle requires a power battery as an energy storage device for kinetic energy recovery and energy optimization. The relay of the power battery is different from the relay used in traditional cars. It has the characteristics of high carrying voltage, large current carrying load, and complex control logic. Therefore, how to reasonably control the opening and closing of the relay and detect the ...

AI Technical Summary

Problems solved by technology

The relay of the power battery is different from the relay used in the traditional car. It has the characteristics of high carrying voltage, large current carrying load, and complex control logic. Therefore, how to reasonably control the opening and closing of the relay and detect the fault state of the relay is easy. appears to be particularly important

[0003] The switch state and fault diagnosis of the relay are related to the high-voltage electrical safety of the car, and the reliability of the relay with feedback is poor, and the failure is often reported by mistake. Therefore, most domestic enterprises currently use high-voltage relays without feedback.

In terms of high-voltage battery control, companies have done a lot of research on power battery management systems, but there is no in-depth research on the control and fault detection of relays without state feedback. Some researchers have conducted some research on relay fault detection, but they are all in the theoretical research stage

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