SYSTEM AND METHOD FOR COMMUNICATION BETWEEN MODULES OF A BATTERY SYSTEM

A battery system includes: a plurality of battery modules including a plurality of battery cells, wherein each battery module comprises a battery module monitor configured to monitor a state of the battery cells; a battery system monitor; and an optical communication system configured to connect the battery module monitors with the battery system monitor over at least two communication paths, wherein the optical communication system is configured to use at least two different wavelengths of light to differentiate between the communication paths.