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Unit cells are held in a plate frame to form a cell module. A plurality of the cell modules is laminated in a thickness direction of the frame to form a laminated structure of unit cells. The cell unit is pressurized with heat sinks from both sides in the direction of the lamination, and is integral

Unit cells are held in a plate frame to form a cell module. A plurality of the cell modules is laminated in a thickness direction of the frame to form a laminated structure of unit cells. The cell unit is pressurized with heat sinks from both sides in the direction of the lamination, and is integrally held to form a battery.

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What is claimed is: 1. A battery comprising: a plurality of cell modules, wherein the cell modules are joined to each other, each of the cell modules having a plurality of flat unit cells, wherein each flat unit cell has a power generation element and a film as an exterior material for the power ge

What is claimed is: 1. A battery comprising: a plurality of cell modules, wherein the cell modules are joined to each other, each of the cell modules having a plurality of flat unit cells, wherein each flat unit cell has a power generation element and a film as an exterior material for the power generation element, wherein electrode tabs are drawn out from the exterior material; and plate frames each having holders, each holder having a center portion surrounded by a peripheral supporter, the center portion defining a bottom side and a top side that are open, wherein each holder holds one of the flat unit cells within each cell module such that the flat unit cells within each module are arrayed on a virtual plane as defined by a plate frame, wherein the plate frames are laminated in a direction intersecting the virtual plane; and wherein an external surface of each given flat unit cell is brought into direct contact with an external surface of an adjacent flat unit cell adjacent to the given flat unit cell in the lamination direction. 2. A battery according to claim 1, wherein the flat unit cells are not electrically connected to each other within each cell module; and wherein each flat unit cell is electrically connected to a corresponding flat unit cell included by an adjacent cell module. 3. A battery according to claim 1, wherein each plate frame holds its respective plurality of flat unit cells, and wherein the plate frames are laminated to form a laminated structure. 4. A battery according to claim 1, further comprising pressurizing holders each of which integrally holds the unit cells by pressurizing the unit cells. 5. A battery according to claim 3, wherein the peripheral supporter of each holder supports a part of a periphery of its respective flat unit cell and positions the flat unit cell therein. 6. A battery according to claim 1, wherein the peripheral supporter of each holder supports a part of a periphery of its respective flat unit cell and positions its respective flat unit cell. 7. A battery according to claim 3, wherein each plate frame has a first connector that electrically connects one electrode tab of one of its respective plurality of flat unit cells being held in the plate frame to one electrode tab of an adjacent flat unit cell being held in another plate frame adjacent thereto in the lamination direction. 8. A battery according to claim 1, wherein each plate frame has a first connector that electrically connects one electrode tab of one of its respective plurality of flat unit cells being held in the plate frame to one electrode tab of an adjacent flat unit cell being held in another plate frame adjacent thereto in the lamination direction. 9. A battery according to claim 1, wherein each plate frame has a second connector that electrically connects one electrode tab of one of its respective plurality of flat unit cells being held in the plate frame to one electrode tab of an adjacent flat unit cell being held in the same plate frame. 10. A battery according to claim 3, wherein each plate frame has a voltage detecting terminal that detects a voltage of a given flat unit cell being held in the plate frame and that is electrically connected to one of the electrode tabs of the given flat unit cell. 11. A battery according to claim 1, wherein each plate frame has a voltage detecting terminal that detects a voltage of a given flat unit cell being held in the frame and that is electrically connected to one of the electrode tabs of the given flat unit cell. 12. A battery according to claim 4, wherein the pressurizing holders function as a pressurizing unit that applies a surface pressure in the lamination direction to all the flat unit cells, and function as a cooler that cools the battery by dissipating heat generated from the unit cells. 13. A battery according to claim 4, wherein the pressurizing holders have a third connector that electrically connects one laminated structure of cell modules to another laminated structure of cell modules. 14. A battery according to claim 1, wherein at least one cooler is interposed between the laminated plate frames. 15. A battery according to claim 1, wherein the flat unit cells are held in plate frames such that polarities of the electrode tabs of the flat unit cells are alternately arranged in the lamination direction. 16. A battery according to claim 1, wherein the flat unit cells laid out in one given plate frame are held in the given plate frame such that polarities of the electrode tabs of the flat unit cells within the given plate frame are alternately arranged in a layout direction. 17. A battery according to claim 1, wherein the power generation element of each flat unit cell has positive electrode plates and negative electrode plates laminated inside in order; and wherein the flat unit cells are laminated in the same direction as the lamination direction of the positive electrode plates and the negative electrode plates of the power generation element. 18. A battery according to claim 1, wherein all the flat unit cells are electrically connected in series.