Battery module and battery system

According to one embodiment, a battery includes a battery group, a case, a metal plate, an insulator and an electrical connection path. The battery group includes a plurality of batteries, and each of the batteries includes an electrode group and a metal exterior container made in which the electrode group is housed. The metal plate is provided between the battery group and the base and forms a clearance between the metal plate and the base. The insulator has plasticity and an electrical insulating property, and is sandwiched between the battery group and the metal plate. The insulator electrically insulates between the exterior container of each of the batteries and the metal plate. The electrical connection path electrically connects the metal plate to the base.