COMMUNICATION DELAY MEASUREMENT IN A BMS COMMUNICATION CHAIN

Disclosed is a a communication chain comprising a battery management unit (BMU) and a plurality of battery cell controllers (BCC), and method of operating the same, comprising: a most-remote BCCs transmitting a message towards the BMU and starting a local-clock counter; each of the other BCCs receiving and forwarding the message towards the BMU and starting a respective local-clock counter; the BMU receiving the message, starting a BMU-clock counter, transmitting a further message and stopping the BMU-clock counter to determine a BMU-interval-count; each of other BCCs receiving and forwarding the second message, and stopping the respective local-clock counter to determine a respective local-interval-count; the most-remote of the BCCs receiving the further message, and stopping the most-remote-local-clock counter to determine its local-interval-count; the BMU broadcasting the BMU-interval-count and the BCCs determining their respective communication delay