Storage battery apparatus

A storage battery apparatus comprising;

• a plurality of storage battery modules each of which includes:
• a battery module including a plurality of battery cells,
• a measurement circuit configured to measure voltages of the battery cells and a temperature of at least one portion of the battery module,
• a wireless transmission/reception module including an antenna configured to transmit and receive a radio wave having a polarization plane in any one of a first direction, a second direction, and a third direction orthogonal to one another in space, and
• an arithmetic processing apparatus configured to control operation of the measurement circuit and the wireless transmission/reception module;
• and
• a battery management unit which includes:
• a plurality of first wireless transmission/reception modules including an antenna configured to transmit and receive a radio wave having the polarization plane in the first direction, one or more second wireless transmission/reception modules including an antenna configured to transmit and receive a radio wave having the polarization plane in the second direction, and
• an arithmetic processing apparatus configured to control operation of the plurality of the first wireless transmission/reception module and the one or more second wireless transmission/reception module;
• wherein, when each of the storage battery modules emits a radio wave having a specific polarization plane in a state where the storage battery apparatus is installed, the first direction is a direction of a polarization plane in which reception power becomes largest at the antenna in the battery management unit, the number of the plurality of the first wireless transmission/reception modules included in the battery management unit is an equal number to the plurality of storage battery modules to be controlled by the battery management unit, a number of the one or more second wireless transmission/reception modules included in the battery management unit is equal to or larger than the number of a value obtained by dividing the number of the storage battery modules by 10,000 and is equal to or larger than one in a case where the value is smaller than 1, and the first direction, the second direction, and the third direction are directions orthogonal to one another in space.