Energy storage apparatus

1. An energy storage apparatus, comprising:

a module unit including one or more energy storage devices;

a module ease holding the one or more energy storage devices, the module case including a first case surface and a second case surface extending vertical to the first case surface; and

a first protrusion that protrudes from the first case surface of the module case so as to form a first space defined by the energy storage device bottom surface and a part of the first case surface, the energy storage device bottom surface including a bottom surface of at least one of the one or more energy storage devices, the first case surface being opposed to the energy storage device bottom surface, another part of the first case surface being in contact with the energy storage device bottom surface,

wherein the first case surface, the first protrusion, and the second case surface are integrally formed as one piece, and

wherein the first protrusion includes a central protrusion disposed at a position on the first case surface that corresponds to a central portion of the energy storage device bottom surface, the central protrusion being horizontally aligned, and longitudinally extending, along a longitudinal direction of the energy storage device bottom surface.

2. The energy storage apparatus according to claim 1 , wherein the first protrusion further includes other protrusions disposed at positions corresponding to at least two of four corners of the energy storage device bottom surface.

3. The energy storage apparatus according to claim 1 , wherein the first protrusion includes a central protrusion disposed at a position corresponding to a central portion of the energy storage device bottom surface.

4. The energy storage apparatus according to claim 1 , further comprising a second protrusion that protrudes from at least one of an energy storage device side surface and the second case surface of the module case so as to form a second space defined by the energy storage device side surface and the second case surface, the energy storage device side surface including a side surface of the at least one of the one or more energy storage devices, the second case surface being opposed to the energy storage device side surface.

5. The energy storage apparatus according to claim 4 , wherein the first space and the second space are communicated with each other.

6. The energy storage apparatus according to claim 1 , wherein the first case surface is devoid of a through-hole in a region corresponding to the energy storage device bottom surface.

7. The energy storage apparatus according to claim 1 , wherein the at least one of the one or more energy storage devices including the energy storage device bottom surface includes a sheet that covers side surfaces, the side surfaces bordering the energy storage device bottom surface.

8. The energy storage apparatus according to claims 1 , wherein the energy storage apparatus comprises the plurality of module units, and

wherein the energy storage apparatus further comprises a plate-like member on which the plurality of module units are mounted.

9. The energy storage apparatus according to claim 8 , wherein adjacently arranged module units included in the plurality of module units are electrically connected.

10. The energy storage apparatus according to claim 8 , wherein each of the plurality of module units includes a plurality of the energy storage devices housed in the module case, and

wherein the plurality of module units are arranged such that a direction of alignment thereof intersects a direction of alignment of the plurality of energy storage devices included in each of the plurality of module units.

11. The energy storage apparatus according to claim 8 , wherein the plate-like member includes first vertical wall at a first end of the plurality of module units in a direction of alignment of the plurality of module units and a second vertical wall at a second end of the plurality of module units in the direction of alignment, and

wherein the first vertical wall and the second vertical wall each include an opening communicating with the first space.

12. The energy storage apparatus according to claim 8 , further comprising a cooling apparatus that introduces a coolant into the module case included in each of the plurality of module units.

13. The energy storage apparatus according to claim 12 , wherein the cooling apparatus is opposed to, among the plurality of module units, an outermost module unit in a direction of alignment of the plurality of module units.

14. The energy storage apparatus according to claim 8 , wherein the module case included in each of the plurality of module units includes a side wall having a plurality of openings, and

wherein the side wall includes a pillar that partitions the plurality of openings and extends in a direction intersecting a direction of alignment of the plurality of module units.

15. The energy storage apparatus according to claim 14 , wherein the module case includes a pair of side walls that are opposed to each other and each include the pillar, and

wherein the pillar included in each of the pair of side walls is provided in a different position in the direction of alignment of the plurality of module units.

16. The energy storage apparatus according to claim 1 , wherein the first protrusion protrudes from the first case surface in a same direction that the second case surface protrudes from the first case surface.

17. The energy storage apparatus according to claim 1 , further comprising a second protrusion that protrudes from at least one of the second case surface of the module case and a side surface of the at least one of the one or more energy storage devices to form a second space defined by the side surface of the at least one of the one or more energy storage devices and the second case surface.

18. The energy storage apparatus according to claim 17 , wherein the second protrusion protrudes, orthogonal to the at least one of the second case surface of the module case and the side surface of the at least one of the one or more energy storage devices, from the at least one of the second case surface of the module case and the side surface of the at least one of the one or more energy storage devices.

19. The energy storage apparatus according to claim 17 , wherein the second protrusion is an integral part of the second case surface of the module case.

20. The energy storage apparatus according to claim 17 , wherein a longitudinal direction of an extension of the second protrusion is orthogonal to a longitudinal direction of an extension of the first protrusion.