Battery device that holds batteries

A battery device configured to hold a plurality of batteries, each battery of the plurality of batteries has a first end face and a second end face opposite to the first end face, each battery of the plurality of batteries has a side face, the battery device comprising:

• a holding base plate located parallel to the first and second end faces of the plurality of batteries;
• and
• a plurality of restriction members protruded from the holding base plate in an axial direction of the plurality of batteries, the plurality of restriction members are located respectively in a plurality of spaces, each space of the plurality of spaces is between adjacent batteries of plurality of batteries, wherein
• each of the plurality of restriction members comprises:
• a tapered surface which is inclined to the axial direction, and the tapered surface is configured to be in line contact with an outer periphery of one of the first and second end faces of a first battery of the adjacent batteries when the each restriction member is located in a space of the plurality of spaces, wherein the space where the each restriction member is located is between the first battery and a second battery of the adjacent batteries, so as to apply a force to move the first battery in a radial direction of the first battery;
• and
• a support surface which supports, by surface contact, a side face of the second battery of the adjacent batteries, wherein the second battery is not in contact with the tapered surface of the each restriction member between the first battery and the second battery, wherein
• the support surface is configured to receive a moving force in the radial direction of the first battery from the tapered surface and support the side face of the second battery by a reactive force due to the moving force, wherein
• the plurality of restriction members are formed of a hard resin material, or of a metal material coated with an insulating resin, wherein the hard resin material includes polyphenylene sulfide or potting resin,
• in a cross sectional view through the each restriction member between the first battery and the second battery of the adjacent batteries:
• the support surface, which supports the side face of the second battery, is non-inclined to the axial direction of the plurality of batteries,
• the tapered surface, which supports the side face of the first battery, is inclined to the axial direction of the plurality of batteries.