A battery pack comprising: a plurality of plate-shaped laminate batteries arranged in a direction vertical to a plate-shaped surface of one of the laminate batteries, wherein the laminate battery contains: a layered body including a negative electrode, a separator, and a positive electrode, the layered body being disposed parallel to the plate-shaped surface of the laminate battery; an outer packaging including a laminate film enclosing the layered body; and an electrode terminal which is electrically connected to the layered body and extends from a one side part of the outer packaging, the outer packaging has, in an inside thereof: a battery part having a space in which the layered body exists; and a bag part having a space a volume of which is changeable, and communicating to the battery part through a communication part, the bag part being disposed on another side part opposite to the one side part, the battery pack includes: the laminate batteries arranged in a manner to have the other side part on an upper side of the battery pack in the vertical direction, and to have the one side part on a lower side of the battery pack in the vertical direction; and a power cable for charging and discharging the battery pack is disposed in the lower side of the battery pack in the vertical direction. a plurality of plate-shaped laminate batteries arranged in a direction vertical to a plate-shaped surface of one of the laminate batteries, wherein the laminate battery contains: a layered body including a negative electrode, a separator, and a positive electrode, the layered body being disposed parallel to the plate-shaped surface of the laminate battery; an outer packaging including a laminate film enclosing the layered body; and an electrode terminal which is electrically connected to the layered body and extends from a one side part of the outer packaging, the outer packaging has, in an inside thereof: a battery part having a space in which the layered body exists; and a bag part having a space a volume of which is changeable, and communicating to the battery part through a communication part, the bag part being disposed on another side part opposite to the one side part, the battery pack includes: the laminate batteries arranged in a manner to have the other side part on an upper side of the battery pack in the vertical direction, and to have the one side part on a lower side of the battery pack in the vertical direction; and a power cable for charging and discharging the battery pack is disposed in the lower side of the battery pack in the vertical direction. a layered body including a negative electrode, a separator, and a positive electrode, the layered body being disposed parallel to the plate-shaped surface of the laminate battery; an outer packaging including a laminate film enclosing the layered body; and an electrode terminal which is electrically connected to the layered body and extends from a one side part of the outer packaging, the outer packaging has, in an inside thereof: a battery part having a space in which the layered body exists; and a bag part having a space a volume of which is changeable, and communicating to the battery part through a communication part, the bag part being disposed on another side part opposite to the one side part, the battery pack includes: the laminate batteries arranged in a manner to have the other side part on an upper side of the battery pack in the vertical direction, and to have the one side part on a lower side of the battery pack in the vertical direction; and a power cable for charging and discharging the battery pack is disposed in the lower side of the battery pack in the vertical direction. a battery part having a space in which the layered body exists; and a bag part having a space a volume of which is changeable, and communicating to the battery part through a communication part, the bag part being disposed on another side part opposite to the one side part, the battery pack includes: the laminate batteries arranged in a manner to have the other side part on an upper side of the battery pack in the vertical direction, and to have the one side part on a lower side of the battery pack in the vertical direction; and a power cable for charging and discharging the battery pack is disposed in the lower side of the battery pack in the vertical direction. the laminate batteries arranged in a manner to have the other side part on an upper side of the battery pack in the vertical direction, and to have the one side part on a lower side of the battery pack in the vertical direction; and a power cable for charging and discharging the battery pack is disposed in the lower side of the battery pack in the vertical direction.