STORAGE BATTERY DEVICE, STORAGE BATTERY DEVICE CONTROL METHOD, AND PROGRAM

A storage battery device (18) includes a first battery system(30a), a second battery system(30b), and a battery management unit (44). The first and the second battery systems (30a, 30b) include a plurality of first and second battery modules (46a, 46b) and a plurality of first and second monitoring units (48a, 48b) detecting module information that is information related to the first and the second battery modules (46a, 46b), and respectively having first and second identification information. The battery management unit (44) receives a lower-level communication frame containing the monitoring identification information and the module information from the first and the second monitoring units (48a, 48b). The battery management unit (44) transmits, to an upper-level device (28) of the battery management unit (44), an upper-level communication frame that contains individual identification information assigned to each of the first and the second monitoring units (48a, 48b) based on system identification information assigned to the first and the second battery systems (30a, 30b), and the first and the second monitoring identification information, that also contains the module information detected by the first or the second monitoring unit (48a, 48b) corresponding to the individual identification information, and that has a larger data size than the lower-level communication frame.