Power conversion systems and power storage systems

Abstract

The problem to be solved by the present invention is to provide a power conversion system and a power storage system that make it difficult for foreign matter such as dust to enter the internal space of a housing from an air inlet. The power conversion system (2) is provided with: a housing (external housing (3)); and a power converter (7). The power converter (7) is arranged in the internal space (300) of the housing. An air inlet (31) and an air outlet (32) are formed on the outer peripheral surface (301) of the housing. The air outlet (32) is connected to the air inlet (31) through the internal space (300) of the housing and is located below the air inlet (31).

Description

Technical Field

[0001] The present disclosure relates generally to a power conversion system and a power storage system, and more particularly to a power conversion system including a housing and a power converter disposed in an inner space of the housing, and a power storage system including the power conversion system. Background Art

[0002] The fuel cell system disclosed in Patent Document 1 is an exemplary known system, which includes a housing and a power converter arranged in the internal space of the housing. In the above-mentioned fuel cell system, the power converter is housed in the housing. The housing has multiple faces, one of which constitutes a maintenance surface that can be removed or opened and closed. Only the maintenance surface is provided with: an air intake port, through which the oxidant gas is introduced into the housing; an exhaust port, through which the exhaust gas discharged from the fuel cell module is discharged from the housing; and a ventilation inlet (inlet) and a ventilation outlet (outlet), through which the internal space of the housing is ventilated with air. The ventilation outlet is arranged above the ventilation inlet.

[0003] However, in the fuel cell system of Patent Document 1, dust and other foreign matter may enter the internal space of the housing through the ventilation inlet, and it is sometimes necessary to reduce this possibility.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-171005 Summary of the invention

[0007] Therefore, an object of the present disclosure is to provide a power conversion system and a power storage system in which the possibility of foreign matter such as dust entering the internal space of a housing through an air inlet is reduced.

[0008] According to one aspect of the present disclosure, a power conversion system includes a housing and a power converter. The power converter is arranged in the internal space of the housing. An air inlet and an air outlet are arranged on the outer peripheral surface of the housing. The air outlet is connected to the air inlet via the internal space of the housing and is located below the air inlet.

[0009] According to another aspect of the present disclosure, a power storage system includes the above power conversion system and a storage battery. The storage battery is to be electrically connected to the power converter. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a cross-sectional view of a power storage system including a power conversion system according to an exemplary embodiment, viewed from above the power storage system.

[0011] Figure 2This is a perspective view of the power conversion system as viewed from below the power conversion system.

[0012] Figure 3 1 is a perspective view of the power conversion system as viewed from above the power conversion system, and illustrates a state in which the cover thereof is opened.

[0013] Figure 4 It is a cross-sectional view of the power conversion system as viewed from the right side of the power conversion system.

[0014] Figure 5 It is a perspective view showing the main parts of the internal casing of the power conversion system.

[0015] Figure 6 It is along Figure 4 A cross-sectional view taken along the plane X1-X1 shown.

[0016] Figure 7 (A) is along Figure 4 A cross-sectional view taken along the plane X2-X2 shown. Figure 7 (B) is composed of Figure 7 This is an enlarged view of the portion indicated by the single-dot chain circle in (A).

[0017] Figure 8 Analysis results of air flow and air temperature distribution in a power conversion system according to an exemplary embodiment are shown.

[0018] Fig. 9 (A) is a schematic diagram of a power conversion system. Fig. 9 (B) is a schematic diagram of a power conversion system according to a first modification example. Fig. 9 (C) is a schematic diagram of a power conversion system according to a second modification.

[0019] Fig.10 is a perspective view of a power conversion system according to a third modification, and illustrates a state in which a cover thereof is opened. DETAILED DESCRIPTION

[0020] A power conversion system and a power storage system according to an exemplary embodiment will now be described with reference to the accompanying drawings. Note that the embodiment to be described later is only an exemplary embodiment of the various embodiments of the present disclosure and should not be construed as limiting. Rather, the exemplary embodiment can be easily changed in various ways according to design choices or any other factors without departing from the scope of the present disclosure. The drawings referred to in the following description of the embodiments are all schematic diagrams. That is, the ratios of the sizes (including thickness) of the various constituent elements illustrated in the drawings do not always reflect their actual size ratios.

[0021] like Figure 1As shown, the power storage system 1 according to the present embodiment includes a power conversion system 2 and a plurality of (for example, Figure 1 In the example shown, there are three) storage batteries 11. Figure 2 and Figure 3 As shown, the power conversion system 2 includes an external housing 3 (housing) and a power converter 7 .

[0022] The power converter 7 is implemented as a power conditioner. The power converter 7 is electrically connected to a plurality of storage batteries 11. The plurality of storage batteries 7 are connected in series, in parallel, or in series and parallel. The power converter 7 converts the DC power supplied from the plurality of storage batteries 11 into AC power, and outputs the AC power to a commercial power grid or a load. In addition, the power converter 7 also converts the AC power supplied from an external power source such as a commercial power grid into DC power, and outputs the DC power to the plurality of storage batteries 11. The number of storage batteries 11 provided may be single or multiple as required.

[0023] The power converter 7 does not necessarily have to be electrically connected to the single or multiple storage batteries 11. Alternatively, the power converter 7 may also be electrically connected to a power source such as a solar cell or a fuel cell.

[0024] The outer shell 3 includes a main body 4 and a cover 5. The main body 4 is formed in the shape of a hollow rectangular parallelepiped. One surface 401 of the main body 4 has an opening 48. The cover 5 is mounted on the main body 4. The cover 5 covers the opening 48. In addition, the cover 5 can be used to cover and expose the opening 48. Specifically, the cover 5 is provided via a plurality of (for example, in Figure 2 The cover 5 is provided with a plurality of hinges 99 (four in the example shown) mounted on the main body 4, and rotates with the plurality of hinges 99 as rotation axes to cover and expose the opening 48. That is, the cover 5 serves as a door of the external housing 3. The cover 5 is not necessarily such a door, but may also be, for example, a panel screwed on the main body 4. If the cover 5 is screwed on the main body 4, the cover 5 can be removed from the main body 4 by unscrewing the threaded portion.

[0025] The power converter 7 includes an inverter, a DC / DC converter, a plurality of switches and a plurality of circuit breakers, and an internal housing 8. The inverter may be implemented as, for example, a non-insulated three-phase inverter. Figure 4As shown, the power converter 7 is arranged in the internal space 300 of the external housing 3. That is, the internal housing 8 is arranged in the internal space 300 of the external housing 3. More specifically, the internal housing 8 is housed in the main body 4 of the external housing 3 and covered by the cover 5. The power converter 7 includes a heat-generating component that generates heat. Specifically, the power converter 7 includes a transformer 71 as a heat-generating component. The transformer 71 is a component of the DC / DC converter of the power converter 7. The heat-generating component is arranged in the internal space 800 of the internal housing 8. The internal space 800 of the internal housing 8 forms a part of the internal space 300 of the external housing 3. Optionally, the power converter 7 may include an AC reactor (which is also a heat-generating component) as a component of the inverter (DC / AC converter). The AC reactor may be arranged in, for example, the following space: In the present embodiment, the space (i.e., the first separated space 810) in which the transformer 71 is arranged. In the first separated space 810, both the transformer 71 and the AC reactor may be arranged, or one of the transformer 71 or the AC reactor may be arranged.

[0026] The external housing 3 (power conversion system 2) is installed outdoors. For example, the external housing 3 may be housed in a box called a "housing". In the housing, a plurality of storage batteries 11 (see Figure 1 ) and an external housing 3. Optionally, an air conditioning device such as an air conditioner may also be installed in the housing. In addition, the number of batteries 11 housed in the housing may be single or multiple as required, and the same is true for the number of power conversion systems 2 housed in the housing.

[0027] The external housing 3 can be installed in a place with a shed or a place without a shed as needed. For example, the external housing 3 can be set on a base set on the ground. Alternatively, the external housing 3 can also be hung on the wall of a building, for example. Nevertheless, the power converter 7 according to the present embodiment is a device for converting high-voltage power, and therefore has a heavier weight than a device for converting low-voltage power. Therefore, the external housing 3 is suitable for being installed in a housing or being set on a base set on the ground.

[0028] The cover 5 of the external housing 3 includes a cover body 51, a shutter 52, and an exhaust hood 53. The external housing 3 is provided with an air inlet 31 and an air outlet 32. More specifically, in the cover 5 of the external housing 3, the cover body 51 is provided with the air inlet 31, and the exhaust hood 53 is provided with the air outlet 32. The air outlet 32 ​​is communicated with the air inlet 31 via the internal space 300 of the external housing 3. The air that has entered the internal space 300 of the external housing 3 through the air inlet 31 is discharged through the air outlet 32.

[0029] The air outlet 32 ​​is located below the air inlet 31. That is, the air inlet 31 is located above the air outlet 32. Compared with the situation where the up-and-down positional relationship between the air inlet 31 and the air outlet 32 ​​is reversed, this reduces the possibility of foreign matter such as sand, dirt, water droplets and dust entering the internal space 300 of the external shell 3 through the air inlet 31. As used in this article, "upper / above" and "lower / below" refer to the position when the external shell 3 is set in the installation position. For example, the installation position can be inside the shell or on the base. The longitudinal axis of the external shell 3 and the longitudinal axis of the internal shell 8 are consistent with the up-and-down direction.

[0030] In addition, the air near the ground may be heated by sunlight reflected from the ground. Even in this case, since the air inlet 31 is located above the air outlet 32, this configuration reduces the possibility of heated air entering through the air inlet 31. This allows the power converter 7 to be effectively cooled using the air sucked in through the air inlet 31.

[0031] In addition, arranging the air inlet 31 above the air outlet 32 ​​reduces the possibility that the air inlet 31 is blocked by snow when it snows.

[0032] In the following description of the power conversion system 2, the cover 5 is assumed to be located “in front” of the inner case 8 when viewed from the inner case 8, and the inner case 8 is assumed to be located “behind” the cover 5 when viewed from the cover 5. In addition, right / left are defined herein relative to the power conversion system 2 when viewed from the front.

[0033] The main body 4 may be formed of, for example, an iron plate. Figure 3 and Figure 4 As shown, the main body 4 has a rear wall 41, an upper wall 42, a lower wall 43, a right wall 44 and a left wall 45. From the periphery of the rectangular rear wall 41, the upper wall 42, the lower wall 43, the right wall 44 and the left wall 45, which are also rectangular, all protrude forward.

[0034] The cover body 51 can be formed of, for example, an iron plate. The cover body 51 has a rectangular plate shape. The cover body 51 is mounted on the front end of the left wall 45 via a plurality of hinges 99. The cover body 51 has a recess 511. The recess 511 of the cover body 51 is recessed from the inner surface 515 of the cover body 51 toward its outer surface 516. The recess 511 is provided near the upper end of the cover body 51. The bottom surface of the recess 511 is lattice-shaped with a plurality of elongated holes 512. The longitudinal axis of the plurality of elongated holes 512 is consistent with the left-right direction.

[0035] The shutter 52 of the cover 5 is installed on the outer surface 516 of the cover body 51. The shutter 52 overlaps with the recess 511 in the front-to-back direction. The shutter 52 includes a plurality of blades 521. The plurality of blades 521 each extend obliquely downward toward the outside of the external shell 3 from the periphery of the associated elongated hole 512 among the plurality of elongated holes 512. The plurality of blades 521 are arranged up and down in parallel along the up-down direction. The plurality of blades 521 are arranged parallel to each other in a manner that a space is left between each pair of blades 521. The environment outside the external shell 3 is connected to the internal space 300 of the external shell 3 via the space between the plurality of blades 521 and the plurality of elongated holes 512 provided through the cover body 51.

[0036] The plurality of elongated holes 512 provided through the cover body 51 together form the air inlet 31. That is, air enters the inner space 300 of the outer housing 3 from the outside of the outer housing 3 through the spaces between the plurality of blades 521 and the plurality of elongated holes 512.

[0037] As used herein, the air inlet 31 may be defined as including the spaces between the plurality of blades 521 and the plurality of elongated holes 512 provided through the cover body 51. In this case, the air inlet 31 is provided over the outer surface of the louver 52, which forms a portion of the outer peripheral surface 301 of the outer shell 3, and over the area of ​​the outer surface 516 of the cover body 51 that faces the louver 52 in the front-to-rear direction. In addition, in this case, if the air inlet 31 is located above the air outlet 32, it means that both the spaces between the plurality of blades 521 and the plurality of elongated holes 512 are located above the air outlet 32.

[0038] Optionally, a dust filter may be installed at the air inlet 31. The dust filter may be installed in, for example, a recess 511 provided through the cover body 51.

[0039] The exhaust hood 53 of the cover 5 has a hollow pyramid shape. An opening portion 531 is provided at the rear end of the exhaust hood 53. The exhaust hood 53 is mounted on the cover body 51 in a manner of protruding forward from the cover body 51. More specifically, an opening portion 514 is provided through the cover body 51, and the peripheral edge portion of the exhaust hood 53 around the opening portion 531 is embedded in the opening portion 514 provided through the cover body 51. The forward protrusion amount of the exhaust hood 53 measured relative to the cover body 51 increases as the distance from the bottom of the exhaust hood 53 decreases.

[0040] The exhaust hood 53 is provided with not only the opening portion 531 but also the air outlet 32. The opening portion 531 and the air outlet 32 ​​are connected to each other via the internal space of the exhaust hood 53. The air outlet 32 ​​is provided to penetrate the lower surface of the exhaust hood 53. The air outlet 32 ​​restricts the air flow blown from the internal space 300 of the external housing 3 toward the outside of the external housing 3 to be downward. This reduces the intrusion of rainwater through the air outlet 32.

[0041] The air outlet 32 ​​is located below the air inlet 31. Therefore, as in the present embodiment, the air outlet 32 ​​restricts the air flow blown out from the internal space 300 of the outer housing 3 toward the outside of the outer housing 3 to be downward, and the air discharged from the air outlet 32 ​​is blown away from the air inlet 31 (i.e., in the opposite direction of the air inlet 31) (i.e., not upward but downward). This reduces the possibility that the air discharged from the air outlet 32 ​​is sucked in through the air inlet 31.

[0042] The outer surface 516 of the cover body 51, the outer surface of the louver 52, the outer surface of the exhaust hood 53, the outer surface of the right wall 44 of the main body 4, the outer surface of the left wall 45 of the main body 4, and the outer surface of the rear wall 41 of the main body 4 together form the outer peripheral surface 301 of the outer shell 3. That is, the "outer peripheral surface 301 of the outer shell 3" refers to all outer surfaces of the outer shell 3 except its upper surface 302 and lower surface 303. The air inlet 31 is provided to penetrate the area facing the louver 52 in the outer surface 516 of the cover body 51. The air outlet 32 ​​is provided to penetrate the outer surface of the exhaust hood 53 that forms a part of the outer peripheral surface 301.

[0043] The air inlet 31 and the air outlet 32 ​​are arranged to penetrate an area located on one side in one direction in the outer peripheral surface 301 of the external shell 3. In addition, the air inlet 31 and the opening portion 514 connected to the air outlet 32 ​​are arranged to penetrate the same surface in the outer peripheral surface 301 of the external shell 3. Specifically, the air inlet 31 and the air outlet 32 ​​are both arranged to penetrate the cover 5. In this case, "one direction" is the front-to-back direction, and "one side in one direction" is the front side. The cover 5 of the external shell 3 is a constituent member of the external shell 3 located on the front side, and covers the internal space 300 of the external shell 3 from the front.

[0044] The air inlet 31 and the air outlet 32 ​​are arranged to penetrate the front area of ​​the outer peripheral surface 301 of the outer shell 3. Figure 1 As shown, around the outer shell 3, only the front of the outer shell 3 (i.e., in the drawing Figure 1 The space SP1 is left at the bottom of the paper surface of the outer shell 3, without leaving any space on the right, left or rear of the outer shell 3. That is, even if any device such as the battery 11 or the wall 12 (such as a structural part of the shell) is arranged on the right, left or rear of the outer shell 3, air can still be sucked in through the air inlet 31 and discharged through the air outlet 32. Compared with the case where the air inlet 31 is arranged to penetrate the front area of ​​the outer peripheral surface 301 of the outer shell 3 and the air outlet 32 ​​is arranged to penetrate the right area, left area or rear area of ​​the outer peripheral surface 301, this can reduce the space left around the outer shell 3.

[0045] In addition, when operating or maintaining the power conversion system 2, the operator opens and closes the cover 5. In this case, the opened cover 5 is located in the space SP1 in front of the outer case 3. This allows the operator to enter the space SP1 and approach the power converter 7. Thus, there is no need to leave any space on the right, left, or rear of the outer case 3.

[0046] In addition, to form the air inlet 31 and the air outlet 32, only the cover 5 needs to be processed. This can reduce the processing cost of the outer case 3 compared to the case where one of the air inlet 31 and the air outlet 32 ​​is provided through the cover 5 and the other is provided through the body 4.

[0047] like Figure 3 and Figure 4 As shown, the power conversion system 2 further includes a deformable portion 21 that can be extended and retracted. The deformable portion 21 is a bellows having a square tube shape. The deformable portion 21 can be extended and retracted in the axial direction. The deformable portion 21 can be made of a combination of materials such as rubber and metal or resin and metal. The first end of the deformable portion 21 is mounted on the periphery of the opening 514 provided through the cover body 51. Figure 3 As shown, when the opening 48 provided through the body 4 is not covered by the cover 5, the second end of the deformed portion 21 does not contact any member and the deformed portion 21 is not compressed. The deformed portion 21 does not necessarily have a square tube shape, but may also have a cylindrical shape, for example.

[0048] like Figure 5 As shown, the inner shell 8 includes an outer wall 81 and a frame 82 supporting the outer wall 81. The outer wall 81 can be formed of, for example, an iron plate. An opening 83 (see FIG. 1 ) is provided through one of the outer walls 81 of the inner shell 8. Figure 3 ).like Figure 4 As shown, when the opening 48 provided through the main body 4 is covered by the cover 5, the second end of the deformed portion 21 contacts the periphery of the opening 83 of the outer wall 81. In this case, the deformed portion 21 is sandwiched between the cover main body 51 and the inner shell 8 to be compressed and deformed. This makes the second end of the deformed portion 21 in close contact with the inner shell 8.

[0049] like Figure 4 and Figure 6 As shown, an air flow path F1 located between the air inlet 31 and the air outlet 32 ​​is formed in the internal space 300 of the external housing 3. The space (flow path F11) located between the internal housing 8 and the external housing 3 forms a part of the flow path F1. That is, there is a gap between each surface of the internal housing 8 (except the lower surface) and the external housing 3, and the gap constitutes the flow path F11. The flow path F11 is formed at least above, behind, to the right and to the left of the internal housing 8. The flow path F1 is a first area through which the air sucked in through the air inlet 31 flows.

[0050] The presence of air in flow path F11 reduces the transfer of heat from the outside of outer case 3 to inner case 8 of power converter 7. This suppresses a rise in the temperature of power converter 7 when, for example, outer case 3 becomes hot due to sunlight.

[0051] The air inlet 31 is at least partially located above the inner shell 8. More specifically, the upper end of the air inlet 31 is located above the inner shell 8. This makes it easier for the air that has entered the inner space 300 of the outer shell 3 through the air inlet 31 to pass through the space above the inner shell 8. Therefore, the air can flow through the inner space 300 more smoothly.

[0052] The internal space (flow path F13) of the deformed portion 21 forms a part of the flow path F1 and communicates with the air outlet 32. The flow of air from the space between the front surface of the inner housing 8 and the inner surface of the front side of the outer housing 3 toward the air outlet 32 ​​is blocked by the peripheral surface of the deformed portion 21. Thus, the air that has entered the internal space 300 of the outer housing 3 through the air inlet 31 flows toward the air outlet 32 ​​via the internal space 800 of the inner housing 8 as will be described later. That is, the deformed portion 21 restricts the flow path of the air.

[0053] like Figure 4 and Figure 5 As shown, the power converter 7 further includes a duct 74 , a first partition plate 75 , and a second partition plate 76 . The duct 74 , the first partition plate 75 , and the second partition plate 76 are disposed in the inner space 800 of the inner housing 8 .

[0054] The internal space 800 of the internal housing 8 includes a first partition space 810 (first area), a second partition space 820 (second area) and a third partition space 830 (second area). The first partition space 810 forms a part of the flow path F1. The air sucked in through the air inlet 31 passes through the first partition space 810. The first partition space 810 is arranged at the rear end of the lower part of the internal housing 8. A transformer 71 as a heat generating component is arranged in the first partition space 810. In the present embodiment, the transformer 71 is a three-wire transformer for alternating current. The transformer 71 is fixed to the second partition plate 76 by screws. The second partition space 820 is arranged in front of the first partition space 810. The first partition space 810 and the second partition space 820 are separated from each other by the first partition plate 75. The power converter 7 includes a plurality of circuit components 77 arranged in the second partition space 820. The first partition plate 75 is a printed circuit board for assembling a plurality of circuit components 77 together. The plurality of circuit components 77 may include, for example, switches and circuit breakers as components of the power converter 7. These switches and circuit breakers are connected to wiring for outputting AC power to a commercial power grid or a load. The third partition space 830 is arranged below the first partition space 810. The first partition space 810 and the third partition space 830 are separated from each other by a second partition plate 76. The power converter 7 includes a plurality of circuit components 78 arranged in the third partition space 830. The plurality of circuit components 78 can be, for example, capacitors. The second partition space 820 and the third partition space 830 are connected to each other.

[0055] As used herein, "partitioning" means providing a space with a wall or any other partitioning member to divide the space into a plurality of spaces separated from each other by the wall or any other partitioning member. The plurality of spaces may be separated from each other by the wall or any other partitioning member in a manner that leaves no gaps therebetween to prevent air from flowing back and forth therebetween. Alternatively, air may flow back and forth between the plurality of spaces.

[0056] The power converter 7 also includes a control box 79. The control box 79 is used to connect the power converter 7 to the plurality of storage batteries 11 (see Figure 1 ), the commercial power grid and the load are selectively electrically connected or disconnected. The control box 79 covers the second partition space 820 from the front. The control box 79 has a door 791. The door 791 forms a part of the front surface of the inner housing 8. The door 791 faces the cover 5.

[0057] The first partition space 810 is separated from the second partition space 820 and the third partition space 830 by the first partition plate 75, the second partition plate 76 and the outer wall 81 of the inner housing 8. Optionally, the first partition space 810 may be communicated with the second partition space 820 and the third partition space 830 via a hole through which a wiring connected to the circuit component 77 or 78 passes. The gap between the inner edge of the hole and the wiring is appropriately closed with a sealing member made of a material such as silicone rubber.

[0058] like Figure 5 As shown, the outer wall 81 of the inner shell 8 has a plurality of (for example, Figure 5 In the example shown, there are three through holes 811. The plurality of through holes 811 open the first partition space 810, which forms a part of the internal space 800 of the internal shell 8, relative to the space (flow path F11) between the internal shell 8 and the external shell 3. The plurality of through holes 811 are arranged to penetrate the rear surface, the right surface and the left surface of the internal shell 8. The direction from the space (flow path F11) between the internal shell 8 and the external shell 3 to the internal space 800 (first partition space 810) of the internal shell 8 via any one of the three through holes 811 is different from each other for the three through holes 811. Specifically, the direction from the flow path F11 to the first partition space 810 is the front direction when passing through the through hole 811 arranged through the rear surface of the internal shell 8, the left direction when passing through the through hole 811 arranged through the right surface of the internal shell 8, and the right direction when passing through the through hole 811 arranged through the left surface of the internal shell 8. That is, the air in the flow path F11 flows through the three through holes 811 in three different directions before entering the first partition space 810. The plurality of through holes 811 are separated from each other by the frame 82. Alternatively, the plurality of through holes 811 may be communicated with each other.

[0059] exist Figure 4 , the internal space (flow path F12) of the pipe 74 forms a part of the flow path F1 between the air inlet 31 and the air outlet 32. The pipe 74 includes: a first cylindrical portion 741 extending in the up-down direction; a second cylindrical portion 742 extending in the front-back direction; and a connecting portion 743, which connects the upper end of the first cylindrical portion 741 and the rear end of the second cylindrical portion 742 together. In the first cylindrical portion 741 and the second cylindrical portion 742, the pipe 74 has a rectangular cross-sectional shape. As used herein, "the cross-sectional shape of the pipe 74" refers to the cross-sectional shape of a plane cut perpendicular to the axis of the flow path of the pipe 74. The flow path F12 inside the pipe 74 is connected to the first partition space 810 at the lower end of the first cylindrical portion 741. The flow path F12 is also connected to the flow path F13 inside the deformation portion 21 at the front end of the second cylindrical portion 742 of the pipe 74. The flow path F12 inside the duct 74 communicates with the gas outlet 32 ​​via the flow path F13 inside the deforming portion 21 .

[0060] like Figure 7 (A) and Figure 7 As shown in (B), the power conversion system 2 includes a plurality of (for example, Figure 7 In the example shown in (A), there are three stacked components 90. Each of the plurality of stacked components 90 includes a power device 91 as a heat generating component generating heat, a plurality of condensers 92, and a radiator 93 serving as a heat dissipation component. That is, the power conversion system 2 includes a plurality of (for example, Figure 7 In the example shown in (A), there are three heat sinks 93. Each of the plurality of heat sinks 93 includes a support member 931 and a plurality of heat sinks 932. The support member 931 has a plate shape. The support member 931 has a first surface 901 and a second surface 902 as both side surfaces thereof in the thickness direction. The plurality of heat sinks 932 protrude from the first surface 901 of the support member 931.

[0061] In each of the plurality of radiators 93, the support member 931 forms a portion of the second barrel portion 742 of the pipe 74. More specifically, one of the plurality of (three) radiators 93 includes a portion of the upper surface of the second barrel portion 742, another radiator 93 includes a portion of the left surface of the second barrel portion 742, and the remaining radiator 93 includes a portion of the right surface of the second barrel portion 742. In each radiator 93, a plurality of fins 932 protrude from the support member 931 toward the inner side of the pipe 74. A plurality of fins 932 are arranged in the flow path F12 inside the pipe 74, on the inner side of the second barrel portion 742. Optionally, a plurality of fins 932 may protrude from the inner circumferential surface of the second barrel portion 742.

[0062] In the area where the plurality of heat sinks 932 are arranged, the direction of travel of the flow path F12 inside the pipe 74 is the front-to-back direction. The thickness direction of the plurality of heat sinks 932 intersects with the direction of travel of the flow path F12 inside the pipe 74. In the radiator 93 among the plurality of (for example, three) heat sinks 93 that includes a portion of the upper surface of the second barrel 742, the thickness direction of the plurality of heat sinks 932 is the left-right direction. In the remaining two radiators 93 among the plurality of heat sinks 93, the thickness direction of the plurality of heat sinks 932 is the up-down direction. In addition, the protruding direction of the plurality of heat sinks 932 from the support member 931 intersects with the direction of travel of the flow path F12 inside the pipe 74. Configuring the plurality of heat sinks 932 in a wall shape allows the formation of a plurality of grooves. That is, a plurality of grooves are formed whose bottoms are defined by the support member 931 and whose side surfaces are defined by the plurality of heat sinks 932. The extension direction of the plurality of grooves (i.e., the direction in which the observer looks directly at the drawing) is the same as that of the support member 931. Figure 7 The direction of the paper surface of (B) is the direction along the flow path F12. Along the flow path F12, the air passes through the gaps between the plurality of heat sinks 932.

[0063] In each of the plurality of stacked members 90, a power device 91 and a plurality of condensers 92 are mounted on a second surface 902 of a support member 931 of a heat sink 93. The power device 91 may be, for example, an insulated gate bipolar transistor (IGBT) or a metal oxide semiconductor field effect transistor (MOSFET). The plurality of power devices 91 and the plurality of condensers 92 of the plurality of stacked members 90 together form an inverter of the power converter 7. The second surface 902 is the opposite surface of the flow path F12 inside the pipe 74. That is, the plurality of heat sinks 93 are arranged along the flow path F12 (first region), while the power device 91 and the plurality of condensers 92 are arranged in the space 840 (second region) around and above the flow path F12. The pipe 74 separates the flow path F12 from the space 840.

[0064] A plurality of circuit components 94 are arranged above the power device 91 and the plurality of condensers 92. The plurality of circuit components 94 may include, for example, switches and circuit breakers as components of the power converter 7. These switches and circuit breakers are connected to the plurality of storage batteries 11 (see Figure 1 )Wiring connection for supplying DC power.

[0065] Figure 8 The analysis results of the air flow and the air temperature distribution in the power conversion system 2 are shown. The air that has entered the internal space 300 of the external housing 3 through the air inlet 31 passes through the flow path F11 between the internal housing 8 and the external housing 3, and flows into the first partition space 810 through the plurality of through holes 811. The air that has entered the first partition space 810 passes through the flow path F12 inside the duct 74, the flow path F13 inside the deformation portion 21, and the internal space of the exhaust hood 53, and is then discharged through the air outlet 32. According to the analysis results, the air in the flow path F12 inside the duct 74 has a higher temperature than the air near the air inlet 31 and the air in the flow path F11. In addition, the air at the air outlet 32 ​​has a higher temperature than the plurality of heat sinks 93 (see FIG. 9 ) in the flow path F12. Figure 4 )The air temperature behind is high.

[0066] Will explain in further detail Figure 8Temperature distribution of the air shown. Outside the outer shell 3, the temperature of the air to be sucked in through the air inlet 31 falls within the first temperature range from 24.97°C to 28.86°C. The temperature of the air in the flow path F11 falls within the first temperature range. The temperature of the air in the flow path F12 inside the duct 74 falls within the combined range of the first temperature range, the second temperature range from 28.86°C to 32.76°C, and the third temperature range from 32.76°C to 36.65°C. The temperature of the air in the inner space of the exhaust hood 53 falls within the combined range of the second temperature range, the third temperature range, and the fourth temperature range from 36.65°C to 40.54°C. The temperature of the air discharged from the air outlet 32 ​​falls within the combined range of the first temperature range, the second temperature range, and the third temperature range. The first separated space 810 has air whose temperature is even higher than the fourth temperature range.

[0067] like Figure 3 and Figure 4 As shown, the power conversion system 2 also includes multiple (for example, in Figure 3 In the example shown, there are six fans 95. The plurality of fans 95 are arranged in the internal space 300 of the outer housing 3. The plurality of fans 95 generate airflow from the air inlet 31 to the air outlet 32 ​​via the internal space 300 of the outer housing 3. In the internal space 300, the plurality of fans 95 are arranged to face the cover 5. More specifically, the plurality of fans 95 are arranged at the front end of the second cylinder portion 742 of the duct 74. Figure 3 As shown, when the cover 5 does not cover the opening 48 provided through the main body 4, the plurality of fans 95 are exposed to the outside from the inner housing 8. Figure 4 As shown, when the cover 5 covers the opening 48 of the main body 4, the plurality of fans 95 are disposed between the air outlet 32 ​​and the plurality of heat sinks 93. More specifically, when the cover 5 covers the opening 48 of the main body 4, the plurality of fans 95 are disposed between the deformation portion 21 and the plurality of heat sinks 93. The plurality of fans 95 blow the air in the inner space of the duct 74 toward the air outlet 32.

[0068] Fig. 9 (A) schematically illustrates the configuration of each constituent element in the power conversion system 2 . Fig. 9 (A) is a right side view of the power conversion system 2. The flow path F11 between the inner housing 8 and the outer housing 3 communicates with the first partition space 810 that forms a part of the inner space 800 of the inner housing 8. The first partition space 810 communicates with the pipe 74 (see Figure 4 ) is connected to the flow path F12 inside. In the first partition space 810, a transformer 71 serving as a heat generating component is disposed. In the flow path F12, a plurality of stacked members 90 (see Figure 7The flow path F12 is connected to the air outlet 32. A plurality of fans 95 are arranged between the flow path F12 and the air outlet 32 ​​(see Figure 3 ). In addition, in the space 840 around and above the flow path F12 in the internal space 800 of the internal housing 8, a plurality of circuit components 94 including switches and circuit breakers are arranged. In the second partition space 820 below the flow path F12, a control box 79 and a plurality of circuit components 77 are arranged. In the third partition space 830 below the first partition space 810, a circuit component 78 (capacitor) is arranged. A partition is provided between each of the space 840, the second partition space 820, and the third partition space 830 and the flow path F1.

[0069] like Figure 4 As shown, the straight-line distance L1 between the transformer 71, which is a heat-generating component, and the air inlet 31 is longer than the straight-line distance L2 between the transformer 71 and the air outlet 32. Therefore, compared with the case where the length relationship between the straight-line distances L1 and L2 is opposite (that is, the straight-line distance L1 is shorter than the straight-line distance L2), this allows the air that has absorbed the heat generated by the transformer 71 to reach the air outlet 32 ​​over a shorter distance. This improves the efficiency of dissipating heat from the transformer 71 to the outside of the external housing 3. In this case, the straight-line distance L1 can be defined as, for example, the straight-line distance between the point on the transformer 71 closest to the air inlet 31 to the point on the air inlet 31 closest to the transformer 71. The straight-line distance L2 can be defined as, for example, the straight-line distance between the point on the transformer 71 closest to the air outlet 32 ​​to the point on the air outlet 32 ​​closest to the transformer 71.

[0070] In addition, along the flow path F1 (see Fig. 9 (A)) The route (curve or combination of straight line and curve) connecting the transformer 71 and the air inlet 31 is longer than the route connecting the transformer 71 and the air outlet 32 ​​along the flow path F1.

[0071] In addition, the plurality of stacked components 90 each include a power device 91 and a plurality of condensers 92 as heat generating components and a heat sink 93 as a heat dissipation component. The straight-line distance between each of the plurality of stacked components 90 and the air inlet 31 is longer than the straight-line distance between the stacked component 90 and the air outlet 32. Figure 4 , there is also shown a straight-line distance L3 between one stack member 90 and the air inlet 31, and a straight-line distance L4 between the stack member 90 and the air outlet 32. In addition, the route (curve or a combination of straight line and curve) connecting each of the plurality of stack members 90 with the air inlet 31 along the flow path F1 is longer than the route connecting the stack member 90 with the air outlet 32 ​​along the flow path F1.

[0072] In the internal space 800 of the internal housing 8, the second area (including the second partition space 820, the third partition space 830 and the space 840) is separated from the first area (flow path F1) through which the air sucked in through the air inlet 31 passes. Therefore, the possibility of collecting foreign matter such as sand, mud, water droplets and dust when the circuit components 77, 78, 94, etc. are arranged in the second area is less than when they are arranged in the first area. On the other hand, since the air sucked in through the air inlet 31 passes through the first area, the transformer 71 and the plurality of heat sinks 93 can be cooled more smoothly when they are arranged in the first area than when they are arranged in the second area.

[0073] (Modifications of the Exemplary Embodiment)

[0074] Next, modifications of the exemplary embodiment will be described. Optionally, the modifications described below may be adopted in combination as needed. In the following description of the modifications, duplicate description will be omitted for the same configuration as the power conversion system 2 according to the exemplary embodiment described above.

[0075] Fig. 9 FIG. 2B shows a power conversion system 2B according to a first modification. Fig. 9 As shown in (B), the outer shell 3B may have multiple (for example, in Fig. 9 In the example shown in (B), there are two) air outlets 32. In addition, in the internal space 800B of the internal housing 8B, a plurality of (for example, in Fig. 9 (B) shows two) flow paths F15. The first end of each of the multiple flow paths F15 is connected to the flow path F11 between the internal shell 8B and the external shell 3B, and the second end thereof is connected to the associated air outlet 32. In each of the multiple flow paths F15, at least a portion of a single or multiple components 96 (for example, a transformer used as a heat-generating component and a radiator used as a heat-dissipating component) and a single or multiple fans 95 are configured. In addition, multiple circuit components 97 are configured between and around the multiple flow paths F15. The multiple circuit components 97 correspond to the circuit components 77, 78 and 94 according to the above-described exemplary embodiment.

[0076] Fig. 9 (C) shows a power conversion system 2C according to a second modification. Fig. 9 (B) and Fig. 9 As shown in (C), the flow path F15 connecting the flow path F11 between the inner shell 8C and the outer shell 3C and the internal space of the exhaust hood 53 may be a straight line. Fig. 9 As shown in (C), a plurality of members 96 may be arranged side by side in the direction of travel of the flow path 15 .

[0077] Fig.10 A power conversion system 2D according to a third modification is shown. Fig.10 As shown, instead of being mounted on the cover 5, the deformation portion 21 may be mounted on the internal housing 8. In this case, when the opening portion 48 provided through the main body 4 is not covered by the cover 5, the first end of the deformation portion 21 does not contact any other member. The second end of the deformation portion 21 is mounted on the internal housing 8. When the opening portion 48 provided through the main body 4 is covered by the cover 5, the first end of the deformation portion 21 contacts the periphery of the opening portion 514 of the cover main body 51. In addition, the deformation portion 21 is sandwiched between the cover 5 and the internal housing 8 and compressed by the cover 5 and the internal housing 8.

[0078] According to another modification, the battery or batteries 11 need not be installed outside the outer case 3 but may be arranged in the inner space 300 of the outer case 3. Optionally, the battery or batteries 11 may also be arranged in the flow path F1 provided in the inner space 300 of the outer case 3.

[0079] In addition, the deformation part 21 according to the above exemplary embodiment has a bellows shape. That is, the deformation part 21 is compressed and folded and stretched by returning from the folded state to the unfolded state. Alternatively, the deformation part 21 may also be a member that expands and contracts due to elasticity, for example.

[0080] In addition, the air outlet 32 ​​does not necessarily have to be provided through the exhaust cover 53. Alternatively, the air outlet 32 ​​may be, for example, an opening provided through the cover body 51.

[0081] Optionally, a plurality of fans 95 may be mounted to the cover 5 .

[0082] In addition, the power converter 7 does not necessarily have to be implemented as a power conditioner. Optionally, the power converter 7 can also be implemented as a DC / DC converter. The power converter 7 used as a DC / DC converter can be connected between a DC power source and a single or multiple storage batteries 11, for example.

[0083] (summary)

[0084] The above-described embodiments and their modifications may be specific implementations of the following aspects of the present disclosure.

[0085] The power conversion system 2 (or 2B, 2C, 2D) according to the first aspect includes a housing (external housing 3, 3B or 3C) and a power converter 7. The power converter 7 is arranged in the internal space 300 of the housing. The outer peripheral surface 301 of the housing is provided with an air inlet 31 and an air outlet 32. The air outlet 32 ​​is connected to the air inlet 31 via the internal space 300 of the housing and is located below the air inlet 31.

[0086] According to the above configuration, the air inlet 31 is located above the air outlet 32 ​​, thereby reducing the possibility of foreign matter such as dust entering the internal space 300 of the housing (external housing 3 , 3B or 3C) through the air inlet 31 .

[0087] In the power conversion system 2 (or 2B, 2C, 2D) according to the second aspect which can be implemented in combination with the first aspect, the internal space 300 of the shell (external shell 3, 3B or 3C) is provided with a flow path F1 to allow air to flow between the air inlet 31 and the air outlet 32.

[0088] The above configuration allows the components of the power converter 7 provided in the flow path F1 to be cooled more efficiently than in the case where the flow path F1 is not provided.

[0089] In the power conversion system 2 (or 2B, 2C, 2D) according to the third aspect that can be implemented in combination with the second aspect, the power converter 7 includes an internal housing 8 (or 8B, 8C). The internal housing 8 (or 8B, 8C) is arranged in the internal space 300 of the housing (external housing 3, 3B or 3C). The space (flow path F11) between the internal housing 8 (or 8B, 8C) and the housing forms at least a part of the flow path F1.

[0090] According to the above configuration, air exists in the flow path F11 between the inner housing 8 (or 8B, 8C) and the housing (the outer housing 3, 3B or 3C), thereby reducing the transfer of heat from the outside of the housing to the inner housing 8 (or 8B, 8C). This suppresses the increase in the temperature of the power converter 7.

[0091] According to the fourth aspect, the power conversion system 2 (or 2B, 2C, 2D) that can be implemented in combination with the third aspect also includes a deformation portion 21. The deformation portion 21 is capable of expansion and contraction. The deformation portion 21 forms a local flow path F13 arranged between the air outlet 32 ​​and the internal space 800 (or 800B) of the internal shell 8 (or 8B, 8C). The local flow path F13 forms a part of the flow path F1. The shell (external shell 3, 3B or 3C) includes a main body 4 and a cover 5. The main body 4 has an opening 48. The power converter 7 is accommodated in the main body 4. The cover 5 is mounted on the main body 4 and can cover and expose the opening 48. The cover 5 is provided with an air outlet 32. The deformation portion 21 is mounted on the cover 5 or the internal shell 8 (or 8B, 8C), and is compressed and deformed by being sandwiched between the cover 5 and the internal shell 8 (or 8B, 8C).

[0092] When the opening 48 provided through the main body 4 is closed by the cover 5, the above-mentioned structure allows the deformation portion 21 to be compressed and deformed by being sandwiched between the cover 5 and the internal shell 8 (or 8B, 8C). Therefore, if the deformation portion 21 is mounted to the cover 5, the deformation portion 21 and the internal shell 8 (or 8B, 8C) can be in close contact with each other, for example, even if the deformation portion 21 is not connected to the internal shell 8 (or 8B, 8C) by screwing. Similarly, if the deformation portion 21 is mounted to the internal shell 8 (or 8B, 8C), the deformation portion 21 and the cover 5 can be in close contact with each other, for example, even if the deformation portion 21 is not connected to the cover 5 by screwing.

[0093] In the power conversion system 2 (or 2B, 2C, 2D) according to the fifth aspect, which can be implemented in combination with the third aspect or the fourth aspect, the air inlet 31 is at least partially located above the inner housing 8 (or 8B, 8C).

[0094] The above configuration reduces the possibility that the air flow that has entered the internal space 300 of the housing (the external housing 3 , 3B, or 3C) through the air inlet 31 is blocked by the internal housing 8 (or 8B, 8C).

[0095] In the power conversion system 2 (or 2B, 2C, 2D) according to the sixth aspect that can be implemented in combination with any one of the third to fifth aspects, a portion of the flow path F1 is located in the internal space 800 (or 800B) of the internal housing 8 (or 8B, 8C). The internal housing 8 (or 8B, 8C) has at least three through holes 811. The plurality of through holes 811 open the internal space 800 (or 800B) of the internal housing 8 (or 8B, 8C) relative to the space (flow path F11) between the internal housing 8 (or 8B, 8C) and the housing (external housing 3, 3B or 3C). The space (flow path F11) forms a portion of the flow path F1. The direction from the space between the internal shell 8 (or 8B, 8C) and the shell (flow path F11) via one of at least three through holes 811 to the internal space 800 (or 800B) of the internal shell 8 (or 8B, 8C) is different from the direction from the space between the internal shell 8 (or 8B, 8C) and the shell (flow path F11) via another of at least three through holes 811 to the internal space 800 (or 800B) of the internal shell 8 (or 8B, 8C).

[0096] The above-described configuration allows the components of the power converter 7 arranged in the internal space 800 (or 800B) of the internal case 8 (or 8B, 8C) to be ventilated from at least three directions and cooled.

[0097] In the power conversion system 2 (or 2B, 2C, 2D) according to the seventh aspect that can be implemented in combination with any one of the second to sixth aspects, the power converter 7 includes: a heat-generating component (power device 91 and condenser 92) that generates heat; and a heat sink 93 that serves as a heat dissipation member. The heat sink 93 includes a support member 931 and a plurality of heat sinks 932. The heat-generating component is mounted on the support member 931. The plurality of heat sinks 932 protrude from the support member 931 and are arranged in the flow path F1. The thickness direction defined relative to the plurality of heat sinks 932 intersects with the travel direction of the flow path F1.

[0098] The above-described configuration allows heat generated by heat-generating components such as the power device 91 and the condenser 92 to be efficiently dissipated by the heat sink 93 .

[0099] In the power conversion system 2 (or 2B, 2C, 2D) according to the eighth aspect that can be implemented in combination with any one of the first to seventh aspects, the internal space 300 of the housing (external housing 3, 3B or 3C) includes a first area (flow path F1) and a second area (a second partition space 820, a third partition space 830 and a space 840). The air sucked in through the air inlet 31 flows through the first area. The second area is separated from the first area by a partition. The power converter 7 includes at least one of a heat dissipation member (heat sink 93) and a heat generating component (transformer 71) that generates heat. At least one of the heat dissipation member and the heat generating component is at least partially configured in the first area.

[0100] According to the above configuration, in the first region (flow path F1) into which air enters through the air inlet 31, at least one member selected from the group consisting of a heat dissipation member (heat sink 93) and a heat generating component (transformer 71) is at least partially arranged, thereby allowing at least one of the heat dissipation member and the heat generating component to be effectively cooled. In addition, the air that has flowed in through the air inlet 31 does not easily enter the second region (the second partition space 820, the third partition space 830, and the space 840) separated from the first region by a partition. When the components are arranged in the second region, this reduces the possibility of those components arranged in the second region collecting foreign matter such as dust.

[0101] In the power conversion system 2 (or 2B, 2C, 2D) according to the ninth aspect which can be implemented in combination with any one of the first to eighth aspects, the air outlet 32 ​​limits the air flow blowing from the internal space 300 of the shell (external shell 3, 3B or 3C) to the outside of the shell to a downward direction.

[0102] The above configuration reduces the possibility that the hot air exhausted from the air outlet 32 ​​returns to the air inlet 31 , thereby allowing the power converter 7 to be effectively cooled.

[0103] In the power conversion system 2 (or 2B, 2C, 2D) according to the tenth aspect which can be implemented in combination with any one of the first to ninth aspects, an air inlet 31 and an air outlet 32 ​​are provided for an area of ​​the outer peripheral surface 301 of the housing (external housing 3, 3B or 3C). The area is located on one side in one direction.

[0104] According to the above configuration, both the air inlet 31 and the air outlet 32 ​​are provided for the region located on one side in one direction in the outer peripheral surface 301 of the housing (external housing 3, 3B or 3C). Thus, for any region other than the region located at the one side, it is not necessary to leave a surrounding space for the purpose of sucking or exhausting air. This can reduce the space left around the housing compared to the case where the air inlet 31 is provided on one side in one direction and the air outlet 32 ​​is provided on the other side in one direction.

[0105] In the power conversion system 2 (or 2B, 2C, 2D) according to the eleventh aspect that can be implemented in combination with the tenth aspect, the housing (external housing 3, 3B or 3C) includes a main body 4 and a cover 5. The main body 4 has an opening 48. The power converter 7 is accommodated in the main body 4. The cover 5 is mounted on the main body 4 and can cover and expose the opening 48. The air inlet 31 and the air outlet 32 ​​are provided through the cover 5.

[0106] According to the above configuration, the air inlet 31 and the air outlet 32 ​​are provided through the cover 5. This allows the space around the cover 5 to be used as both a space for inhaling and exhausting air and a space that allows an operator to enter in order to expose the opening 48 provided through the main body 4 by opening the cover 5 and operate or maintain the components inside the housing (external housing 3, 3B or 3C). This can reduce the space left around the housing compared to a case where at least one of the air inlet 31 and the air outlet 32 ​​is provided for a component other than the cover 5.

[0107] The power conversion system 2 (or 2B, 2C, 2D) according to the twelfth aspect, which can be implemented in combination with any one of the first to eleventh aspects, further includes a fan 95. The fan 95 is disposed in the internal space 300 of the housing (external housing 3, 3B or 3C).

[0108] The above-described configuration allows power converter 7 to be cooled more efficiently.

[0109] In the power conversion system 2 (or 2B, 2C, 2D) according to the thirteenth aspect that can be implemented in combination with the twelfth aspect, the housing (external housing 3, 3B or 3C) includes a main body 4 and a cover 5. The main body 4 has an opening 48. The power converter 7 is accommodated in the main body 4. The cover 5 is mounted on the main body 4 and can cover and expose the opening 48. In the internal space 300 of the housing, the fan 95 is arranged to face the cover 5.

[0110] The above-described configuration allows an operator to easily perform maintenance including replacement and repair of the fan 95 by opening the cover 5 to expose the opening portion 48 provided through the main body 4 .

[0111] In the power conversion system 2 (or 2B, 2C, 2D) according to the fourteenth aspect which can be implemented in combination with any one of the first to thirteenth aspects, the power converter 7 includes a heat dissipation member (heat sink 93) and a heat generating component (transformer 71, power device 91, and condenser 92) that generates heat. The distance (straight-line distance L1 or L3) from the air inlet 31 to one member selected from the group consisting of the heat dissipation member and the heat generating component is longer than the distance (straight-line distance L2 or L4) from the air outlet 32 ​​to the one member.

[0112] Compared to the case where the distance (straight-line distance L1 or L3) from the air inlet 31 to one member selected from the group consisting of the heat dissipating member (heat sink 93) and the heat generating component (transformer 71, power device 91, and condenser 92) is shorter than the distance (straight-line distance L2 or L4) from the air outlet 32 ​​to the one member, the above-mentioned configuration allows the air whose heat has been absorbed into the one member to reach the air outlet 32 ​​via a shorter distance. This allows the heat to be effectively dissipated from the one member to the outside of the housing (external housing 3, 3B, or 3C). In this case, the distance from the air inlet 31 to the one member and the distance from the air outlet 32 ​​to the one member may be a straight-line distance or a distance measured along a line drawn along the flow path F1 as required.

[0113] Note that components other than the components in the first aspect are not essential components for the power conversion system 2 (or 2B, 2C, 2D) and may be omitted as necessary.

[0114] The power storage system 1 according to the fifteenth aspect includes the power conversion system 2 (or 2B, 2C, 2D) according to any one of the first to fourteenth aspects and a storage battery 11. The storage battery 11 is electrically connected to the power converter 7.

[0115] According to the above-mentioned structure, in the shell (external shell 3, 3B or 3C) of the power conversion system 2 (or 2B, 2C, 2D), the air inlet 31 is located above the air outlet 32, thereby reducing the possibility of foreign matter such as dust entering the internal space 300 of the shell through the air inlet 31.

[0116] Description of Reference Numerals

[0117] 1 Power storage system

[0118] 2.2B, 2C, 2D Power Conversion System

[0119] 21 Deformation

[0120] 3, 3B, 3C External shell (shell)

[0121] 31 Air Inlet

[0122] 32 Air outlet

[0123] 300 Interior Space

[0124] 301 Outer surface

[0125] 4 Main Body

[0126] 48 Opening

[0127] 5. Cover

[0128] 7 Power Converters

[0129] 71 Transformer (heat generating component)

[0130] 8, 8B, 8C Inner housing

[0131] 800, 800B Internal Space

[0132] 811 Through Hole

[0133] 820 Second partition space (second area)

[0134] 830 The third partition space (the second area)

[0135] 840 Space (Second Area)

[0136] 91 Power devices (heat generating components)

[0137] 92 Condenser (heat generating component)

[0138] 93 Radiator (heat dissipation component)

[0139] 931 Supporting member

[0140] 932 Heat sink

[0141] 95 Fan

[0142] F1 flow path (first area)

[0143] F11 Flow path (space)

[0144] F13 flow path

[0145] L1, L2, L3, L4 straight line distance (distance)

Claims

1. A power conversion system, comprising: case; A power converter disposed in the interior space of the housing; and A deformable part capable of extension and contraction, The outer peripheral surface of the housing is provided with: Air intake; and an air outlet, which is configured to communicate with the air inlet via the internal space of the housing and is located below the air inlet, The inner space of the housing is provided with a flow path configured to allow air to flow between the air inlet and the air outlet, The internal space of the deformation portion forms a part of the flow path.

2. The power conversion system according to claim 1, characterized in that: The power converter includes an inner housing disposed in an inner space of the housing, and A space between the inner housing and the housing forms at least a portion of the flow path.

3. The power conversion system according to claim 2, characterized in that: The deformed portion forms a partial flow path as a part of the flow path, which is provided between the air outlet and the inner space of the inner shell. The housing comprises: a main body having an opening portion and configured to accommodate the power converter; and a cover mounted on the main body and configured to cover and expose the opening portion, The cover is provided with the air outlet, and The deformation portion is mounted on the cover or the inner case, and is configured to be compression-deformed by being sandwiched between the cover and the inner case.

4. The power conversion system according to claim 2 or 3, characterized in that: The air inlet is at least partially located above the inner shell.

5. The power conversion system according to claim 2 or 3, characterized in that: A portion of the flow path is located in the inner space of the inner shell, The inner shell has at least three through holes configured to open the inner space of the inner shell relative to a space between the inner shell and the shell that forms a part of the flow path, and A direction from the space between the inner shell and the shell through each of the at least three through holes to the inner space of the inner shell is different from a direction from the space between the inner shell and the shell through any other through hole of the at least three through holes to the inner space of the inner shell.

6. The power conversion system according to claim 2 or 3, characterized in that: The power converter includes: a heat generating component configured to generate heat; and a heat sink serving as a heat dissipation member, The heat sink includes: a support member on which the heat generating component is mounted; and a plurality of heat sinks protruding from the support member and arranged in the flow path, and A thickness direction defined with respect to the plurality of fins intersects with a traveling direction of the flow path.

7. The power conversion system according to claim 1 or 2, characterized in that: The inner space of the housing includes: a first area through which the air sucked in through the air inlet flows; and a second area separated from the first area by a partition. The power converter includes at least one of a heat dissipation member and a heat generating component configured to generate heat, and At least one of the heat dissipating member and the heat generating component is at least partially arranged in the first region.

8. The power conversion system according to claim 1 or 2, characterized in that: The air outlet is configured to restrict a flow of air, which is blown from an internal space of the housing to the outside of the housing, downward.

9. The power conversion system according to claim 1 or 2, characterized in that: The air inlet and the air outlet are provided for an area of ​​the outer peripheral surface of the housing, and the area is located on one side in one direction.

10. The power conversion system according to claim 9, characterized in that: The housing comprises: a main body having an opening portion and configured to accommodate the power converter; and A cover is mounted on the main body and is configured to cover and expose the opening, and the air inlet and the air outlet are provided through the cover.

11. The power conversion system according to claim 1 or 2, characterized in that: The power conversion system further includes a fan disposed in the interior space of the housing.

12. The power conversion system according to claim 11, characterized in that: The housing comprises: a main body having an opening portion and configured to accommodate the power converter; and A cover is mounted on the main body and is configured to cover and expose the opening portion, and the fan is arranged to face the cover in the inner space of the housing.

13. The power conversion system according to claim 1 or 2, characterized in that: The power converter includes at least one of a heat dissipating member and a heat generating component configured to generate heat, and A distance from the air inlet to one member selected from the group consisting of the heat dissipating member and the heat generating component is longer than a distance from the air outlet to the one member.

14. An electric power storage system comprising: The power conversion system according to any one of claims 1 to 13; and A storage battery is electrically connected to the power converter.

Images