BATTERY APPARATUS AND CURRENT SENSOR DIAGNOSIS METHOD

In the battery apparatus, a plurality of battery packs including a first battery pack and a second battery pack are connected in parallel, and a plurality of current sensors including a first current sensor measuring a current of a first battery pack and a second current sensor measuring a current of the second battery pack are provided. A processing circuitry diagnoses the first current sensor and the second current sensor based on a ratio between a current of the first battery pack and a current of the second battery pack that are calculated based on resistances or capacities of the plurality of battery packs, and a ratio between the current of the first battery pack and the current of the second battery pack that are measured by the plurality of current sensors.