WO2016129385A1

WO2016129385A1 - Electrical energy storage device

Info

Publication number: WO2016129385A1
Application number: PCT/JP2016/052162
Authority: WO
Inventors: 光益加納; 真一浦野
Original assignee: 日立化成株式会社
Priority date: 2015-02-09
Filing date: 2016-01-26
Publication date: 2016-08-18
Also published as: JPWO2016129385A1; JP6344491B2

Abstract

This electrical energy storage device 10 comprises a storage battery board 11 and a battery pack 20 that is arranged on a supporting plate 19; and the battery pack 20 is provided with a cell group 23 that is composed of a plurality of cells 22 and a battery pack case 21 that contains the cell group 23. Within the battery pack case 21, a cooling wind passage, in which a cooling wind flows along the cells 22 from one end toward the other end, is formed. A cover 51 is arranged between a front wall 14 and the battery pack 20, and the cover 51 guides a cooling wind, which has flowed thereinto through an air intake port that is provided in the front wall, to the cooling wind passage.

Description

Power storage device

The present invention relates to a power storage device having a plurality of battery packs and a storage battery panel for housing the battery packs.

Power storage device is used to store power and supply the stored power to the outside. The power storage device includes battery cells such as a lead secondary battery (lead storage battery) and a lithium ion secondary battery, a lithium ion capacitor, and the like. When the power storage device, that is, the power storage system is used in a factory or an office building, the power can be backed up when the used power reaches a peak, and the battery cell can be charged when the used power is low. In addition, a power storage device is also used to stably use distributed renewable energy such as wind power generation and solar power generation while maintaining a power demand balance.

A plurality of battery cells are incorporated in the battery pack, and the battery pack is composed of a plurality of battery cells and a battery pack case. A plurality of battery packs are incorporated in the storage battery panel to constitute one power storage device. In the storage battery panel, an arbitrary number of power storage devices are arranged in a battery room or a container according to the storage power capacity, the output voltage, or the like. Since heat is generated in the battery cell during charging and discharging, it is necessary to cool the battery cell by flowing cooling air through a storage battery board in which a plurality of battery packs are incorporated.

Patent Document 1 describes a battery unit panel in which a battery unit incorporated in a casing is cooled by cooling air.

JP 2013-196908 A

As described in Patent Document 1, a cooling method for battery cells includes a type in which a cooling fan is attached to each battery pack that houses a battery unit (corresponding to the battery cell of the present invention), and a housing. There is a type in which a cooling fan that generates cooling air is attached to a housing and cooling air is introduced into a battery pack. If each battery pack is provided with a cooling fan, the size of the battery pack is increased, so that space saving becomes difficult. Furthermore, since the cooling fan is a consumable part, the number of maintenance inspections increases, and maintenance inspection is not easy with a large-capacity facility.

On the other hand, a cooling fan is provided in the housing to generate cooling air from the front intake port provided on the front wall of the housing toward the back side in the housing and cool it in the case inlet provided on the front surface of the battery pack. When the wind is introduced, the cooling air flowing in from the front intake port is introduced into the battery pack to cool the battery cells, and flows along the inner surface of the front wall through the outside of the battery pack. Later, it is branched into a detour flow discharged to the outside. For this reason, the ratio introduced into the battery pack is greatly reduced, and it is not possible to introduce all the cooling air flowing in from the front intake port into the battery pack.

In other words, in a storage battery panel of a type in which a cooling fan that generates cooling air in the housing is attached to the housing, the battery cells that should be cooled become airflow resistance of the cooling air, so cooling introduced into the battery pack There is a problem that the rate of wind decreases, the rate of bypass flow that passes through the outside of the battery pack increases, and the cooling performance of the storage battery panel that constitutes the power storage device cannot be improved.

An object of the present invention is to improve the cooling performance of the power storage device.

The power storage device includes a front battery wall, a rear wall, a top wall, and left and right side walls, and a plurality of support plates attached at intervals in the vertical direction, a battery cell group including a plurality of battery cells, and the battery A plurality of battery packs disposed on the support plate, and formed in the battery pack, the battery cells extending from one end to the other end of the battery pack case; A cooling air passage through which cooling air flows, a cover that is disposed between the front wall and the battery pack, and that guides the cooling air that has flowed from an air inlet provided in the front wall to the cooling air passage, Have

A cover is provided between the front wall and the battery pack, and the outside air flowing from the air inlet provided on the front wall, that is, the cooling air, does not flow around the gap between the front wall and the battery pack, Installed in the battery pack. Thereby, it becomes possible to cool efficiently the battery cell accommodated in the battery pack, and it can improve the cooling performance, ie, heat dissipation performance, of the power storage device.

It is a front view which shows the electric power storage apparatus which is one Embodiment. It is a perspective view which shows the power storage device of the state which opened the front wall of the storage battery panel. FIG. 2 is a cross-sectional view taken along line AA in FIG. It is a perspective view which shows one of the battery packs mounted in a storage battery board. It is a perspective view which shows the state which removed the cover from the battery pack. It is a perspective view which shows the back side of the cover shown by FIG. (A) is an expanded sectional view of the B section in Drawing 3, (B) is an expanded sectional view showing the same portion as (A) in the power storage device which is a comparative example. It is a top view which shows the case main body of a battery pack case. FIG. 9 is a sectional view taken along line CC in FIG. (A) is the schematic which shows the flow of the cooling wind in the electric power storage apparatus which is one Embodiment, (B) is the schematic which shows the flow of the cooling air in the electric power storage apparatus which is a comparative example. It is a heat dissipation characteristic diagram which shows the measurement result of cell calorific value and cell temperature about the electric power storage apparatus which is one Embodiment, and the electric power storage apparatus which is a comparative example. It is a perspective view which shows the battery pack of the electric power storage apparatus which is other embodiment. It is a perspective view which shows the battery pack of the electric power storage apparatus which is further another embodiment. It is a perspective view which shows the battery pack of the electric power storage apparatus which is further another embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 to 3, the power storage device 10 has a power storage housing, that is, a storage battery board 11. The storage battery panel 11 includes left and

right side walls

12 and 13, a front wall 14, a back wall 15, a top wall 16 and a bottom wall 17. As described above, each of the storage battery panels 11 has a rectangular parallelepiped shape having a rectangular wall, and the inside is a housing space 18.

As shown in FIG. 3, a plurality of support plates 19 are attached to the inside of the storage battery board 11 at intervals in the vertical direction. A plurality of battery packs 20 are disposed on each support plate 19. The power storage device 10 includes a storage battery board 11 provided with seven support plates 19 and battery packs 20 mounted on each of the support plates 19 in a total of 28 battery packs. 20 is incorporated in the storage battery panel 11. However, the number of support plates 19 attached to the storage battery board 11 is not limited to seven, and the number of battery packs 20 mounted on each support plate 19 is not limited to four, but one power storage device 10. The number of battery packs 20 constituting the is arbitrarily set.

FIG. 4 is a perspective view showing one of the battery packs 20, and the battery pack 20 includes a battery pack case 21 having a substantially rectangular parallelepiped shape. As shown in FIG. 8, a battery cell group 23 including a plurality of cylindrical battery cells 22 is accommodated in the battery pack case 21. Each battery cell 22 is a lithium ion secondary battery, and has a function of charging electric power and a function of discharging. The battery cell group 23 includes a lower cell group 23a composed of six battery cells 22 arranged in parallel and an upper cell group 23b composed of six battery cells 22 arranged in parallel. As described above, the battery cell group 23 includes 12 battery cells 22. However, the number of the battery cells 22 constituting the battery cell group 23 is not limited to 12 and is arbitrarily set. Moreover, as a cross-sectional shape of the battery cell 22, there exist a cross-sectional type and a cross-sectional square type as shown in the figure.

Terminal electrodes are provided on both end faces of the battery cell 22, and the battery cells 22 constituting the battery cell group 23 are connected in series. In order to connect in series, the terminal electrodes at both ends of the battery cells 22 adjacent in the horizontal direction have opposite polarities, and the terminal electrodes at both ends of the battery cells 22 adjacent in the vertical direction also have opposite polarities. ing. Terminal electrodes of adjacent battery cells 22 are connected by a bus bar (not shown). A positive output bus bar 25 and a negative output bus bar 26 are attached to the upper and lower battery cells 22 on the front side in the battery cell group 23. The

bus bars

25 and 26 are shown in FIG. The battery pack case 21 protrudes from the front surface.

As shown in FIG. 9, the battery pack case 21 for accommodating the battery cell 22 made of a lithium ion secondary battery has a resin bottom lid 31 and a top lid 32, respectively. A plate-like cell holder 33a extending in the front-rear direction of the lid 31 is provided so as to protrude upward. Three cell holders 33a are provided in correspondence with both ends and the center of the battery cell 22, and one cell holder 33a is shown in FIG. The upper lid 32 is provided with cell holders 33b extending in the front-rear direction of the upper lid 32 so as to protrude downward, and three cell holders 33b are provided corresponding to the cell holders 33a. A resin middle frame 34 is disposed between the bottom lid 31 and the top lid 32, and the middle frame 34 has a cell holder 33c sandwiched between the

cell holders

33a and 33b. Each of the cell holders 33a to 33c is formed with a semicircular concave surface 35, and each battery cell 22 is in a state in which both end portions and a central portion enter the concave surface 35, and the bottom lid 31 and the top lid 32 and the middle frame 34.

The bottom lid 31, the top lid 32, and the middle frame 34 constitute a case main body 21a having a skeleton structure that accommodates all the battery cells 22 with a gap therebetween. As shown in FIG. 4, a side plate 36 is attached to one side of the case body 21a, and a side plate 37 is attached to the other side. As shown in FIG. 9, a metal front plate 38 is attached to one end of the case body 21a, that is, the front side, and a back plate 39 is attached to the other end, that is, the back side. Thus, the front plate 38 and the back plate 39 are provided in the battery pack case 21 so as to be positioned between the

side plates

36 and 37, respectively. Under the state where the battery cell group 23 is sandwiched between the case main bodies 21 a, the respective battery cells 22 are accommodated in the battery pack case 21 so as to extend in the left-right direction of the battery pack case 21.

A bracket 41 is attached to the front surface of the front plate 38 with a screw member. The bracket 41 has a stopper portion 41a protruding above the battery pack case 21, and the battery pack 20 attached to the support plate 19 is fixed to the support plate 19 by a screw member by the stopper portion 41a. The bracket 41 is provided with a notch 42 for allowing the operator to insert one hand when the operator carries the battery pack 20.

As shown in FIGS. 1 and 2, the front wall 14 has two

doors

14 a and 14 b, and the battery pack 20 to the support plate 19 in a state where the

doors

14 a and 14 b are opened. And removal work from the support plate 19, that is, a detachment work is performed.

The storage battery panel 11 has a front wall 14 formed by opening and closing doors 14a to 14d, and a wall body that is opened when the battery pack 20 is attached to and detached from the housing space 18 is used as the front wall 14. A wall that faces and is not provided with an open / close door is defined as a back wall. The battery pack 20 has an end surface facing the front wall 14 as a front surface. The front, rear, left and right of the battery pack 20 indicate the positional relationship with respect to the storage battery panel 11 when the battery pack 20 is fixed to the support plate 19.

As shown in FIG. 9, a gap is provided between the lower cell group 23a and the upper cell group 23b, and a cooling air passage 44a is formed by the gap as indicated by an arrow. A gap is provided between the lower cell group 23a and the bottom lid 31 of the battery pack case 21, and a cooling air passage 44b is formed by the gap as indicated by an arrow. Similarly, a gap is provided between the upper cell group 23b and the upper lid 32 of the battery pack case 21, and a cooling air passage 44c is formed by this gap as indicated by an arrow.

As shown in FIG. 8 and FIG. 9, the battery cell group 23 composed of a plurality of battery cells 22 has two upper and lower stages, but the number of stages is not limited to two, and the number of stages is arbitrary. be able to. That is, it is important that a cooling air passage is formed in the battery pack.

An inlet 46 communicating with the battery pack case 21 is provided in the front plate 38. The front plate 38 is provided with two reinforcing

pieces

45a and 45b extending in the horizontal direction, that is, in the left-right direction. The inlet 46 is partitioned into a plurality of inlets 46a to 46c in the vertical direction by both the reinforcing

pieces

45a and 45b. It has been. Further, as shown in FIG. 5, the respective inlets 46a to 46c are divided into left and right by reinforcing pieces 45c extending in the vertical direction. The inlet 46a faces the cooling air passage 44a, the inlet 46b faces the cooling air passage 44b, and the inlet 46c faces the cooling air passage 44c. As shown in FIG. 5, the bracket 41 is provided with inflow ports corresponding to the inflow ports 46 a to 46 c formed in the front plate 38.

An outlet 48 communicating with the battery pack case 21 is provided on the back plate 39. As shown in FIG. 9, the back plate 39 is provided with two reinforcing

pieces

47a and 47b extending in the horizontal direction, and the outlet 48 is provided with a plurality of outlets in the vertical direction by both the reinforcing

pieces

47a and 47b. It is partitioned into 48a to 48c. The outlet 48a faces the inlet 46a, the outlet 48b faces the inlet 46b, and the outlet 48c faces the inlet 46c. The cooling air flows from the inlet 46 toward the outlet 48 in the horizontal direction from the front side to the back side in the battery pack case 21. Since the battery cell 22 is arranged in a direction crossing the cooling air passages 44 a to 44 c, the cooling air flows along the outer peripheral surface in a direction crossing the outer peripheral surface of the battery cell 22. Thereby, the battery cell 22 is cooled.

Note that the battery cell 22 can also be cooled in the battery pack 20 including the front plate 38 on which the reinforcing pieces 45a to 45c are not provided and the back plate 39 on which the reinforcing

pieces

47a and 47b are not provided.

In order to generate cooling air in each battery pack 20, three cooling fans 49 are arranged on the upper part of the storage battery panel 11. Each cooling fan 49 is fixed to the top wall 16. An exhaust passage 50 is provided on the back side of the storage battery board 11, and the exhaust passage 50 is formed between the back wall 15 and the back plate 39 of each battery pack 20. The outlet 48 provided on the other end of the battery pack 20, that is, on the back side, communicates with the exhaust passage 50, and the cooling air flowing out from the outlet 48 is guided to the outside by the exhaust passage 50.

In the space between the open /

close doors

14a and 14b constituting the front wall 14 and the front plate 38 which is one end of the battery pack case 21, as shown in FIG. 3 and FIG. 51 is arranged. The cover 51 guides the cooling air flowing from the air inlet 52 provided in the front wall to the cooling air passages 44a to 44c. As shown in FIG. 1, the opening /

closing doors

14 a and 14 are provided with 28 intake ports 52 corresponding to all the battery cells 22.

As shown in FIGS. 4 to 6, the cover 51 has a quadrilateral detachable frame portion 53 that is detachably attached to the front plate 38, that is, detachably attached. An engaging claw 54 is provided. A quadrilateral communication port 55 is provided in the detachable frame portion 53 so as to face the inlet 46 of the battery pack case 21. The detachable frame portion 53 is provided with two reinforcing

pieces

56a and 56b extending in the horizontal direction, and the communication port 55 is partitioned into a plurality of communication ports 55a to 55c in the vertical direction by both the reinforcing

pieces

56a and 56b. Yes. Further, as shown in FIG. 4, each of the communication ports 55a to 55c is divided into left and right by a reinforcing piece 56c extending in the vertical direction. The communication port 55a faces the inflow port 46a, the communication port 55b faces the inflow port 46b, and the communication port 55c faces the inflow port 46c.

Since the cover 51 is detachable from the battery pack 20, even when the battery pack 20 is replaced, the cover 51 can be reused and attached to the replaced battery pack 20. When the cover 51 is attached to the front plate 38, the reinforcing pieces 56a to 56c of the cover 51 are overlapped with the reinforcing pieces 45a to 45c of the front plate 38. If the cover 51 and the front plate 38 are of a type that is not provided with a reinforcing piece, the resistance of the outside air flowing into the battery pack 20 from the air inlet 52 can be reduced. The reinforcing piece is not the essence of the present invention, but may be added in consideration of the strength of the cover 51. However, if the cooling operation is hindered in actual operation, there can be a variation corresponding to the reduction or elimination of the reinforcing pieces.

The cover 51 has a quadrilateral introduction frame portion 58 provided with an introduction port 57, and the size of the introduction frame portion 58 in the vertical and horizontal directions is larger than that of the removable frame portion 53. A tapered portion 59 is provided between the introduction frame portion 58 and the detachable frame portion 53, and the tapered portion 59 is inclined inward from the introduction frame portion 58 toward the detachable frame portion 53. The cover 51 is integrally formed with a detachable frame portion 53, an introduction frame portion 58 and a taper portion 59. The length in the left-right direction of the introduction frame portion 58 of the cover 51 is shorter than the length in the left-right direction in accordance with the opening of the battery pack case 21, and the cover 51 is attached to the battery pack 20 as shown in FIG. When attached to the front wall 14, the front end surfaces of the

side plates

36 and 37 of the battery pack case 21 are exposed. FIG. 2 shows a state in which the cover 51 is not attached to the battery pack 20, and the energization member 27 for connecting the bus bars 25, 26 of the battery packs 20 adjacent to each other vertically is exposed on the front wall 14.

A quadrangular elastically deformable packing 60 made of rubber, soft resin or the like is provided on the introduction frame 58. The packing 60 abuts against the front wall 14 and seals between the inside and the outside of the introduction port 57. When the cover 51 is disposed between the battery pack 20 and the front wall 14, the cooling air flowing from the air inlet 52 reduces leakage to the outer surface of the battery pack 20 as much as possible, and is guided into the battery pack case 21 by the cover 51. Is done.

As shown in FIG. 1, each intake port 52 is formed by a plurality of slits 62. The number of slits 62 constituting the air inlet 52 corresponding to the lowermost battery pack 20, that is, the slit density is the largest, and the slit density constituting the air inlet 52 corresponding to the uppermost battery pack 20 is the smallest. The slit density gradually increases from the top to the bottom. As a result, the opening area of the intake port 52 formed by the plurality of slits 62 gradually increases from the uppermost intake port 52 toward the lowermost intake port 52. When the opening area of the intake port 52 is increased, the inflow resistance of outside air that flows into the battery pack case 21 through the intake port 52 from the outside, that is, the inflow resistance of cooling air, is decreased.

On the other hand, since the cooling fan 49 is provided in the upper part of the storage battery board 11, the flow path length of the cooling air flowing through the battery pack 20 from the inlet 52 to the cooling fan 49 passes through the lower battery pack 20. The cooling air that is used is longer than the cooling air that passes through the upper battery pack 20. When the flow path length of the cooling air is increased, the ventilation resistance of the cooling air is increased.

As shown in FIG. 1, when the opening area of the intake port 52 is gradually increased from the uppermost intake port 52 toward the lowermost intake port 52, the intake port 52 is inserted into the lower battery pack 20 having a large ventilation resistance. Therefore, the flow rate of the cooling air flowing through the battery pack 20 toward the cooling fan 49 can be made substantially uniform for all the battery packs 20.

FIG. 7B shows a power storage device 10a as a comparative example, and FIG. 7B shows a portion similar to FIG. 7A showing the power storage device 10 of one embodiment. . FIG. 10A is a schematic diagram showing the flow of cooling air in the power storage device 10, and FIG. 10B is a schematic diagram showing the flow of cooling air in the power storage device 10a as a comparative example.

In the power storage device 10 in which the cover 51 is disposed between the front wall 14 and the battery pack 20, all the outside air flowing into the storage battery panel 11 from the intake port is guided by the cover 51 as indicated by an arrow 63. Flow in the battery pack 20. The cooling air that has passed through each battery pack 20 is merged in the exhaust passage 50 provided on the back wall 15 side, and the merged cooling air is provided in the upper part of the storage battery panel 11 as indicated by an arrow 64. It is discharged to the outside through the fan 49.

On the other hand, in the power storage device 10a shown in the comparative example, the outside air that has flowed into the storage battery panel 11 from the air intake port, as indicated by the arrow 63, and the cooling air flowing through the battery pack 20 as indicated by the arrow 65, It is branched into a detour wind that flows upward through the gap between the front wall 14 and the battery pack 20. The bypass air 65 branched in this way is discharged to the outside without contributing to cooling of the battery pack 20.

Therefore, as shown in FIG. 10 (A), when all the outside air that has flowed into the storage battery panel 11 from the intake port is introduced into the battery pack 20 by the cover 51, and as shown in FIG. 10 (B), the intake port When the outside air that has flowed into the storage battery board 11 is branched into cooling air and bypass air, the cooling effect of the battery cells 22 can be enhanced by arranging the cover 51 in the storage battery board 11. . The cooling air 63 shown in FIG. 10 shows the flow of the cooling air passage 44a shown in FIG. 9, and the flows of the other cooling

air passages

44b and 44c are omitted in FIG.

FIG. 11 is a heat dissipation characteristic diagram showing the measurement results of the cell heat generation amount and the cell temperature for the power storage device 10 as an embodiment and the power storage device 10a as a comparative example. In FIG. 11, the thick line indicates the heat dissipation characteristic of the power storage device 10 according to the embodiment of the present invention, and the thin line indicates the heat dissipation characteristic of the power storage device 10a as the comparative example.

As apparent from FIG. 11, even when the heat generation amount of the battery cell in the power storage device 10 and the heat generation amount of the battery cell in the power storage device 10a are the same, the temperature of the battery cell in the power storage device 10 of the present invention is set. The cooling performance of the power storage device 10, that is, the heat dissipation performance can be improved. Further, when the cell temperature with respect to the cell heat generation amount is set to be the same as that in the comparative example, the cooling fan 49 can be reduced in size. In FIG. 11, the cell temperature indicates an average value of the temperatures of the outer peripheral surfaces of all the battery cells 22.

In addition to the function of introducing air into the battery pack 20 by the cover 51, as described above, the opening area of the intake port 52 is gradually increased from the uppermost intake port 52 toward the lowermost intake port 52 to When the flow rate of the cooling air that passes through the pack 20 toward the cooling fan 49 is made substantially uniform for all the battery packs 20, all the battery cells 22 accommodated in the battery pack 20 can be uniformly cooled. .

12 to 14 are perspective views showing battery packs of a power storage device according to another embodiment. In these drawings, members that are the same as those described above are given the same reference numerals.

12 is different from the cover 51 shown in FIGS. 4 to 6 in that the cover 51 is not provided with reinforcing

pieces

56a, 56b. Therefore, the communication port 55 formed in the detachable frame portion 53 is not partitioned by a plurality of communication ports. The size of the introduction frame portion 58 of the cover 51 shown in FIG. 12 is the same as that of the cover 51 shown in FIG.

13, the length of the introduction frame portion 58 in the left-right direction is almost the same as the length of the battery pack case 21 in the left-right direction. Thus, the introduction frame portion 58 covers the front surfaces of the

side plates

36 and 37 of the battery pack case 21, and the front surfaces of the bus bars 25 and 26 are covered by the introduction frame portion 58. The size and structure of the detachable frame portion 53 of the cover 51 shown in FIG. 13 are the same as those of the cover 51 shown in FIG. 4, and reinforcing

pieces

56 a and 56 b are provided on the detachable frame portion 53.

The cover 51 shown in FIG. 14 has the same size of the introduction frame 58 as the cover 51 shown in FIG. 13, and the detachable frame 53 is provided with reinforcing

pieces

56a and 56b like the cover 51 shown in FIG. It is not done.

The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. For example, in the embodiment, the cover 51 is attached to the battery pack 20, but the cover 51 may be attached to the front wall 14. Moreover, as a form of the battery cell 22, there are a lithium ion secondary battery, a lead secondary battery, and the like, but a storage cell such as a lithium ion capacitor may be used.

This power storage device is arranged in a power supply room provided in a factory or office building, and backs up the power when the power usage reaches a peak in the factory or the like, and charges the battery cell when the power usage is low.

Claims

A storage battery panel that includes a front wall, a back wall, a top wall, and left and right side walls, and a plurality of support plates are attached at intervals in the vertical direction;
A battery cell group comprising a plurality of battery cells, and a battery pack case that houses the battery cell group, and a plurality of battery packs disposed on the support plate;
A cooling air passage formed in the battery pack, in which cooling air flows along the battery cells from one end of the battery pack case toward the other end;
A cover that is disposed between the front wall and the battery pack and guides the cooling air flowing into the cooling air passage from an air inlet provided in the front wall;
A power storage device.
2. The power storage device according to claim 1, wherein the cover is provided with an engagement claw that is detachably engaged with one end of the battery pack case, and is provided with a communication port that communicates with the inside of the battery pack case. A power storage device comprising: a frame portion; and an introduction frame portion provided with an introduction port facing the intake port.
3. The power storage device according to claim 2, wherein a packing abutting against the front wall is provided on the introduction frame portion.
4. The power storage device according to claim 2 or 3, wherein the detachable frame portion has a reinforcing piece extending in a horizontal direction, and the communication port is partitioned into a plurality by the reinforcing piece.
The power storage device according to any one of claims 2 to 4, wherein the battery pack case includes left and right side plates, and a front plate provided between the side plates and provided at one end of the battery pack case. A power storage device for engaging the engaging claw with the front plate.
6. The power storage device according to claim 5, wherein a length of the introduction frame portion in a left-right direction is shorter than a length of the battery pack case in a left-right direction, and a side plate of the battery pack case is exposed to the front wall. apparatus.
6. The power storage device according to claim 5, wherein the introduction frame portion has a length in a left-right direction that covers a side plate of the battery pack case.
The power storage device according to any one of claims 1 to 7, wherein a cooling fan is provided on an upper portion of the storage battery panel, and the cooling fan generates cooling air flowing through the cooling air passage.
The power storage device according to any one of claims 1 to 8, wherein an exhaust passage for guiding cooling air flowing out from the other end of the battery pack case to the outside is formed on a back side of the battery panel. apparatus.
The power storage device according to any one of claims 1 to 9, wherein the battery cell group is an upper cell formed by arranging a plurality of the battery cells in parallel in a direction crossing the cooling air passage. A group and a lower cell group, between the upper cell group and the lower cell group, between the upper cell group and the battery pack case, and between the lower cell group and the battery pack case The electric power storage device that forms the cooling air passages respectively.
The power storage device according to any one of claims 1 to 10, wherein the front wall has an open / close door, and the battery pack is attached to the support plate with the open / close door open. A power storage device for attaching / detaching a pack and attaching / detaching the cover to / from the storage battery panel.