Power management in electric vehicles

摘要

Various techniques described herein relate to electric vehicle power management system for managing a plurality of battery modules in a battery pack. Such electric vehicle power management system may include a plurality of battery management systems corresponding to a plurality of battery modules, and an energy management system for managing the plurality of battery management systems. The energy management system and the plurality of battery management systems may adopt master-slave wireless communication, and may use a single wireless frequency channel or a plurality of assigned wireless frequency channels.

主权项

1. An electric vehicle power management system used for managing a plurality of battery modules, the electric vehicle power management system comprising:
a plurality of battery modules; a plurality of battery management systems, each said battery management system comprising a battery management processor, a battery management communication module, and a unique battery management system address, wherein each of the plurality of battery management systems has a battery management system address, is connected to a corresponding battery module and is configured to manage one or more battery cells of its corresponding battery module; and an energy management system comprising an energy management processor and an energy management communication module, wherein the energy management system is operatively connected to the battery management systems via a set of wireless frequency channels such that the energy management system is connected to each of the plurality of the battery management systems via a wireless frequency channel that is in the set and that uniquely corresponds to the battery management system, and the energy management system is configured to:
set a communication interval time;
select a first battery management system from the plurality of battery management systems;transmit a first command to the first battery management systems using the wireless frequency channel corresponding to the first battery management system, the first command carrying an address identifying the first battery management system and requesting data from the first battery management system;after the requested data from the first battery management system having been received or the communication time interval has expired, determine whether a data request has been sent to a second battery management system; andwhen it is determined that a data request has not been sent to the second battery management system, transmit a second command to the second battery management systems using the wireless frequency channel corresponding to the second battery management system, the second command carrying an address identifying the second battery management system and requesting data from the second battery management system; and, wherein each of the plurality of battery management systems is further configured to use its respective battery management processor and battery management communication module to:
receive a command from the energy management system via the wireless frequency channel corresponding to the battery management system;compare an address in the command identifying a selected battery management system to its own battery management system address;determine, based on the comparison whether it is the selected battery management system; andupon determining that it is the selected battery management system, process and respond to the received command from the energy management system.