A battery management system state switching method

Abstract

The invention discloses a battery management system state shifting method. The battery management system state switching method is characterized in that a battery management system comprises a battery management system body and an awaking power circuit. The method comprises that in a working state, both the power management system body and a power supply circuit of the awaking power circuit and are switched on, and are provided with interior voltages, and the battery management system enters a working state; in a closed state, the voltages acted both on the battery management system body and on the awaking power circuit vanish, the battery management system enters a closed state; and in a dormant state, when the time is larger than t, the battery management system body has no working tasks, and the power supply circuit of the battery management system body is switched off. The battery management system state switching method has the advantages of saving energy consumption, prolonging service life of an electric vehicle, and ensuring that the situation that a battery set system is monitored in a long-distance mode is possible, wherein a long-distance monitoring system can awake the battery management system by sending controlled area network (CAN) signals, and ensures that the situation that the battery set system is monitored in a long-distance mode is possible.

Description

Technical field [0001] The invention relates to a working state switching method, in particular to a battery management system state switching method. Background technique [0002] The battery management system is composed of a master control unit, a slave control unit, a high-voltage unit, and an external relay array. The existing battery management system has only two states: working state and shutdown state. In many cases, only part of the modules of the battery management system are working, and most of the circuits are not working. For example, when the vehicle key is turned to the ON state, if the battery information does not need to be monitored for a long time, the battery management system in the working state is not needed at this time, and the power of the low-voltage power supply battery is wasted. [0003] And when the battery management system is used in the field of electric vehicles, due to the high requirements of the existing electric vehicle industry on the batt...

AI Technical Summary

Problems solved by technology

For example, when the vehicle key is in the ON state, if there is no need to monitor the battery information for a long time, the battery management system in the working state at this time is unnecessary, which wastes the power of the low-voltage power supply battery

[0003] And when the battery management system is applied to the field of electric vehicles, due to the high requirements of the existing electric vehicle industry on the battery management system, the following problems will also be faced: when the electric vehicle key is in the ON state (that is, when the electric vehicle is started), ), when the remote monitoring system needs to monitor the battery status information, the battery management system cannot be directly awakened by the CAN signal, and the purpose of intelligent remote monitoring cannot be achieved; when the electric vehicle key is turned off, if the battery needs to be charged, the battery management system cannot directly Wake up by CAN signal, at this time, the charger needs to provide low-voltage power to trigger the battery management system to work

If the low-voltage power supply of the charger is disconnected, the battery management system cannot work normally, and the battery status cannot be monitored. At this time, it is not easy to find out whether the battery management system is faulty or the charger is faulty, which is inconvenient for maintenance.

Images