BATTERY APPARATUS

A battery apparatus may include: a plurality of battery cells, each of the battery cells having a positive electrode and a negative electrode; and a plurality of battery tabs. Each of the battery tabs has at least one cell-connection part, which is electrically connected to the positive electrode or the negative electrode of a respective one of the plurality of battery cells, and a sheet part, which is integrally formed with the at least one cell-connection part. Each of the battery tabs may be either a first-type battery tab or a second-type battery tab. The sheet thickness of at least one portion of the first-type battery tab may be larger than the sheet thickness of at least one portion of the second-type battery tab.