Self-check method, device and system of high-voltage loop of power battery

Abstract

The invention provides a self-check method, device and method of a high-voltage loop of a power battery. When the high-voltage loop of the power battery is initialized, a timer is started; a first voltage, which is the voltage between the common end of the power battery and a pre-charged resistor and the common end of the power battery and a high-voltage main negative relay, is obtained; when a DC main positive relay and a DC main negative relay do not exist in the high-voltage loop of the power battery, a second voltage, which is the voltage between the common end of a pre-charged relay and a high-voltage main positive relay and the common end of a load and the high-voltage main negative relay, is obtained; whether the first voltage and the second voltage satisfy a first preset self-check condition is determined; if YES, it is determined that the high-voltage loop of the power battery passes self-check; and if NO, it is determined that the high-voltage loop of the power battery fails in self-check. Self-check for the high-voltage loop of the power battery is realized, faults after closing of the high-voltage loop of the power battery are prevented, and the safety of whole automobile is further ensured.

Description

technical field [0001] The present application relates to the field of new energy technologies, and in particular to a self-inspection method, device and system for a power battery high-voltage circuit. Background technique [0002] At present, as the world's oil resources are becoming more and more scarce, major international and domestic automobiles are devoting themselves to vigorously developing new energy vehicles to advocate energy saving and emission reduction. Among them, new energy vehicles with electric drive as the technical line have increasingly become the mainstream choice of major car companies. As one of the core components of new energy vehicles, the power battery has high voltage characteristics. Therefore, for users, the safety of the high-voltage circuit of the power battery is particularly important. [0003] The power battery high-voltage circuit self-inspection is a series of self-inspection processes for the power battery high-voltage circuit before ...

AI Technical Summary

Problems solved by technology

However, it is found that most of the high-voltage circuits of power batteries do not perform self-inspection processing at present. If the high-voltage circuits of power batteries do not perform self-inspection processing, a failure will occur later, which will increase the number of times the relays in the high-voltage circuit of the power battery are closed and disconnected, affecting The service life of the relay will bring loopholes to the safety of the high-voltage circuit of the power battery, which will seriously affect the safety of the whole vehicle

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