Online double-circuit power supply diagnosis circuit and method and storage medium

Abstract

The invention relates to an online double-circuit power supply diagnosis circuit and method and a storage medium. The online double-circuit power supply diagnosis circuit comprises a battery pack module and a battery management system module. The battery pack module comprises a first lithium battery and a relay; the battery management system module comprises a BAT power supply loop module electrically connected with a power supply and taking point A, a KL power supply loop module electrically connected with a power supply and taking point B and connected with the BAT power supply loop module in parallel, a diagnosis loop module electrically connected with the BAT power supply loop module and the KL power supply loop module, a second lithium battery electrically connected with the diagnosis loop module and the first lithium battery, and an MCU control module electrically connected with the BAT power supply loop module, the KL power supply loop module and the diagnosis loop module. The BMS battery management system automatic diagnosis can be realized, the relay does not need to be disconnected in the whole vehicle driving process, the online diagnosis is realized, and the diagnosis flexibility is high.

Description

technical field [0001] This application relates to the technical field of low-voltage battery management systems for new energy vehicles, and in particular to an online dual power supply diagnostic circuit, method and storage medium. Background technique [0002] In recent years, the new energy industry has developed rapidly. With the reduction of weight and the improvement of vehicle performance, lithium batteries are gradually used in vehicles to replace traditional lead-acid batteries as low-voltage power supply, and safety issues follow. Therefore, lithium batteries are generally equipped with BMS. (BATTERY MANAGEMENT SYSTEM-battery management system) monitors the status of lithium batteries in real time; warns in advance before a failure occurs or actively disconnects the discharge circuit to ensure the safety of the vehicle; usually a relay is added between the positive pole of the lithium battery and the positive pole of the battery pack so that the BMS can pass throug...

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Problems solved by technology

[0003] At present, in order to meet the functional requirements of the reverse connection function of the electrical test, the current dual power supply system adds a diode to each power supply input to prevent the short circuit of the dual power supply under certain circumstances; at present, there are problems with the dual-circuit diagnosis of the existing scheme: 1 .Requires the participation of an external DCDC (Direct Current-DC power converter), and the diagnostic logic is complex. It cannot be diagnosed when the DCDC is abnormal, and the reliability is poor; 2. The logic of the diagnostic part needs to be disconnected when the relay is disconnected, and it can only be performed during the parking process. Diagnosis, the diagnosis cannot be made during the use of the vehicle, the diagnosis flexibility is poor, and the problem cannot be diagnosed in real time when there is a fault in the driving process

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