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Energy Storage: Multi-battery Charge Equalization Circuits
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Patent US10131246
Issued 2018-11-20
Communication System For Battery Management Systems In Electric Or Hybrid Vehicles
A circuit can include a CAN bus and multiple nodes. The multiple nodes can reboot at the same time so that a Time 0 is set at boot for each node. Each node can store an ID node and determine from its ID node one time slot of a plurality of periodic time slots starting from Time 0 in which to transmit on the CAN bus. Each node can transmit messages on the CAN bus in its determined time slot subsequent to Time 0.
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- 1. A communication system for battery management systems in a vehicle, the communication system comprising:
a communication bus; and a plurality of battery management systems configured to communicate with one another via the communication bus and reboot at the same time so that a reboot time is set at boot of the plurality of battery management systems, the plurality of battery management systems comprising a first battery management system and a second battery management system, wherein the first battery management system is configured to:
determine from a first identifier a first time slot of a plurality of time slots starting from the reboot time in which to transmit via the communication bus,
monitor a first battery, and
subsequent to the reboot time, transmit a first message via the communication bus in the first time slot and not in the plurality of time slots other than the first time slot, the first message comprising first information about the first battery,
wherein the second battery management system is configured to:
determine from a second identifier a second time slot of the plurality of time slots starting from the reboot time in which to transmit via the communication bus, the second identifier being different from the first identifier,
monitor a second battery different from the first battery, the second battery and the first battery being configured to individually and together power an electronic device, and
subsequent to the reboot time, transmit a second message via the communication bus in the second time slot and not in the plurality of time slots other than the second time slot, the second message comprising second information about the second battery.
- 25. A method of operating a vehicle comprising a communication bus and a plurality of battery management systems, the method comprising:
rebooting the plurality of battery management systems at the same time; setting a reboot time at boot of the plurality of battery management systems; determining, by a first battery management system of the plurality of battery management systems, from a first identifier a first time slot of a plurality of time slots starting from the reboot time in which to transmit via the communication bus; monitoring, by the first battery management system, a first battery; subsequent to the reboot time, transmitting, by the first battery management system, a first message via the communication bus in the first time slot and not in the plurality of time slots other than the first time slot, the first message comprising first information about the first battery; determining, by a second battery management system of the plurality of battery management systems, from a second identifier a second time slot of a plurality of time slots starting from the reboot time in which to transmit via the communication bus, the second identifier being different from the first identifier; monitoring, by the second battery management system, a second battery different from the first battery; subsequent to the reboot time, transmitting, by the second battery management system, a second message via the communication bus in the second time slot and not in the plurality of time slots other than the second time slot, the second message comprising second information about the second battery; and powering the vehicle with the first battery and the second battery.
