Patent ID: 8389151

Claim:
A battery unit, comprising: a casing having a recess that extends into the casing between a first and a second stacked type battery contained inside the casing; the first and second stacked type batteries including a plurality of stacked battery elements having sheet electrodes on opposite sides of an electrolyte, housed in said casing; the first stacked type battery having a first plate-shaped collector electrode with a side facing towards the recess, wherein the first electrode has a first conductive, elastically deformable member that extends into the recess; the second stacked type battery having a second plate-shaped collector electrode with a side facing towards the recess, wherein the second electrode has a second conductive, elastically deformable member that extends into the recess; and a plug detachably inserted into the recess between said first and second stacked type batteries such that the plug is in contact with and electrically connecting the first and second conductive members.