Battery management system and method for updating firmware of slave devices of battery management system

An operation method for a battery management system in a power-saving mode, wherein a master device and N slave devices of the battery management system form a wireless daisy chain network topology, and the operation method includes:

• the master device transmitting a power-saving mode command to an n-th slave device among the N slave devices, wherein N is a positive integer and n is a positive integer between 1 and N;
• the n-th slave device forwarding the received power-saving mode command to an (n+k)−th slave device among the N slave devices according to a predetermined forwarding order, wherein k is a positive integer between 1 and N−1, and the n-th slave device entering a deep sleep mode according to the power-saving mode command;
• and
• in the others slave devices, operating sequentially to forward the power-saving mode command from one slave device to another slave device according to the predetermined forwarding order, and to enter the deep sleep mode of the one slave device, until a last-stage slave device in the predetermined forwarding order receives the power-saving mode command and enters the deep sleep mode;
• wherein, when the one or more slave devices in the predetermined forwarding order, are in the deep sleep mode, only a power management unit of each of the one or more slave devices remains in operation, and wherein, the power management unit of the one or more slave devices exits the deep sleep mode within a preset time interval, to enter a listening mode for detecting and receiving a wake-up message when transmitted from the master device.

A battery management system, including:

• a master device;
• and
• N slave devices connected in series wirelessly, each of the N slave devices including a power management unit, wherein N is a positive integer;
• wherein the master device and the N slave devices form a wireless daisy chain network topology, and the battery management system enters a power-saving mode by:
• the master device transmitting a power-saving mode command to an n-th slave device among the N slave devices, wherein n is a positive integer between 1 and N;
• the n-th slave device forwarding the received power-saving mode command to an (n+k)−th slave device among the N slave devices according to a predetermined forwarding order, wherein k is a positive integer between 1 and N−1, and the n-th slave device entering a deep sleep mode according to the power-saving mode command;
• in the others slave devices, sequentially forwarding the power-saving mode command from one slave device to another slave device according to the predetermined forwarding order, and entering the deep sleep mode of the one slave device, until a last-stage slave device in the predetermined forwarding order receives the power-saving mode command and enters the deep sleep mode;
• and
• wherein, when one or more of the slave devices in the predetermined forwarding order are in the deep sleep mode, only the power management unit of each of the one or more slave devices remains in operation, and wherein the power management unit of each of the one or more slave devices exits the deep sleep mode within a preset time interval to enter a listening mode, for detecting and receiving a wake-up message when transmitted from the master device.