Fault detection system, method and device for battery system and electric vehicle

Abstract

The present invention discloses a system, method and device of fault detection of a battery system and an electric vehicle. The pre-charge resistor in the battery system is in series with a pre-charge relay and then is in parallel with an anode relay; the first end of the anode relay is connected with the anode of a power supply module; the second end of the anode relay is connected with a capacitor; and a cathode relay is connected with the cathode of the power supply module. The fault detection system comprises: a first voltage measurement device which has one end connected with the connection node between the pre-charge resistor and the pre-charge relay and the other end connected with the cathode of the power supply module, and is configured to detect the faults of the cathode relay and / or the pre-charge resistor; a second voltage measurement device which has one end connected with the second end of the anode relay and the other end connected with the cathode of the power supply module, and is configured to detect the faults of the anode relay and / or the pre-charge relay. According to the invention, the technical problem is solved that the faults of a high-voltage relay in an electric vehicle battery system cannot be detected in the prior art so that the electric vehicle battery system has safety risks.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a battery system fault detection system, method and device, and an electric vehicle. Background technique [0002] With the rapid development of new energy technologies, the application of electric vehicles is becoming more and more extensive. The battery system of electric vehicles provides electric energy for electric vehicles. The battery system includes multiple high-voltage relays. The safety performance of each high-voltage relay directly determines the safety performance of the high-voltage battery system of electric vehicles. However, the electric vehicle in the related art cannot detect the fault of the high-voltage relay in the battery system before the high voltage is powered on, and cannot accurately locate the fault point of the high-voltage relay in the battery system, which leads to potential safety hazards in the battery system of the electric vehicle, which in turn leads...

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Problems solved by technology

[0004] Embodiments of the present invention provide a battery system fault detection system, method and device, and an electric vehicle, so as to at least solve the technical problem in the related art that the electric vehicle battery system has potential safety hazards due to the inability to detect the fault of the high-voltage relay in the electric vehicle battery system

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