CN113924683A - Cooler-integrated battery tray for mobile body and battery device for mobile body - Google Patents

Abstract

A cooler-integrated battery tray (2) for a mobile body is provided with a recessed tray main body (20) which includes a bottom surface portion (21) and a side surface portion (22) for mounting a battery cell (1). The bottom surface portion integrally has a hollow region (50) surrounded by an upper surface plate (41), a lower surface plate (42), and a side wall (43). The bottom surface portion includes a refrigerant inlet (44) and a refrigerant outlet (45) that communicate with the hollow region, and a fin member (60) disposed in the hollow region.

Description

Cooler-integrated battery tray for mobile body and battery device for mobile body

Technical Field

The present invention relates to a cooler-integrated mobile battery tray and a mobile battery device, and more particularly to a cooler-integrated mobile battery tray and a mobile battery device that accommodate battery cells.

Background

Conventionally, a battery tray for a moving body that accommodates battery cells is known. Such a battery tray is disclosed in, for example, japanese patent laid-open publication No. 2015-137009.

In japanese patent application laid-open No. 2015-137009, a1 st tray and a2 nd tray are disposed on an automobile chassis, a battery pack is disposed on the 1 st tray, and a battery pack cooling device is disposed on the 2 nd tray. The battery pack includes a battery main body and an electronic device. The battery pack cooling device includes a cooling fan and an air duct, and cools the battery pack by supplying cooling air to the battery pack.

Documents of the prior art

Patent document

Patent document 1 Japanese laid-open patent publication No. 2015-

Disclosure of Invention

Technical problem to be solved by the invention

In particular, in a mobile body that can move using electric power as a main power source, a large battery device that houses a plurality of battery cells is required, and the size, weight, and power supply stability of the battery device are very important because they directly relate to the performance of the mobile body. In order to maintain a stable power supply, as described in japanese patent application laid-open No. 2015-137009, a structure for cooling the battery cells is provided.

However, in the above japanese patent application laid-open No. 2015-137009, not only the battery pack (battery cells) but also a cooling device needs to be provided on the battery tray. Therefore, there are inconveniences such as the battery device becomes large according to the area occupied by the cooling device, and the weight of the battery device increases according to the weight of the cooling device. In addition, since the battery device is provided with a wiring member and the like to ensure water tightness and have high sealing performance, circulation of cooling air from the cooling device is easily hindered. Since circulation of cooling air is hindered, temperature unevenness of the battery cells is likely to occur, and it is difficult to secure power supply stability.

Therefore, as a battery device mounted on a mobile body, it is necessary to reduce the size and weight and to improve the cooling performance of a battery cell for stable power supply.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a cooler-integrated battery tray for a mobile unit and a battery device for a mobile unit, which can reduce the size and weight of the battery device and improve the cooling performance of a battery cell.

Means for solving the technical problem

In order to achieve the above object, a cooler-integrated battery tray for a moving body according to claim 1 includes a recessed tray main body including a bottom surface portion on which a battery cell is provided and a side surface portion rising from a periphery of the bottom surface portion, the bottom surface portion including an upper panel, a lower panel, and a side wall disposed between the upper panel and the lower panel and integrally having a hollow region surrounded by the upper panel, the lower panel, and the side wall, the bottom surface portion including a refrigerant inlet and a refrigerant outlet communicating with the hollow region, and a fin member disposed in the hollow region.

In the cooler-integrated mobile body battery tray according to claim 1, the hollow region through which the coolant can flow is integrally formed in the bottom surface portion where the battery cells are provided, as described above. Thus, the bottom surface of the battery tray itself can be configured as a cooling device for the battery cells, and therefore, it is not necessary to separately dispose a cooling device on the upper portion of the battery tray. As a result, the space for the cooling device above the battery tray can be reduced, and therefore, the size of the battery device can be reduced. Further, since the bottom surface portion includes the hollow region in addition to the need for providing the cooling device, the weight of the battery device can be reduced as compared with a case where the entire bottom surface portion is formed of a solid plate member, for example. Further, since the battery cells can be cooled from the lower surface side of the battery cells by the bottom surface portions, the plurality of battery cells can be uniformly cooled without being affected by high sealing performance inside the battery device or the presence of wiring members and the like. Further, since the fin member is disposed in the hollow region through which the refrigerant flows, the strength of the hollow bottom portion can be enhanced, and the heat conduction performance of the bottom portion can be improved. By this, the size and weight of the battery device can be reduced, and the cooling performance of the battery cell can be improved.

In the above-described invention 1, the fin member preferably has portions extending in the direction along the bottom surface portion and in the direction intersecting each other. Here, the fin member not only improves the heat conduction performance of the bottom surface portion, but also functions as a reinforcing member in the hollow region because the fin member has high mechanical strength against a bending load in the direction in which the fin member extends. Therefore, as described above, the fin members extend in different directions in the plane along the bottom surface portion, and thus the mechanical strength of the entire bottom surface portion can be improved without depending on the direction in which the bending load acts. As a result, the bottom surface portion of the battery tray is formed to have a hollow structure, so that the battery tray can be reduced in weight and can easily secure mechanical strength necessary for holding a plurality of battery cells.

In this case, the fin member is preferably a corrugated fin extending in the 1 st direction and bent into a wave shape in the 2 nd direction orthogonal to the 1 st direction. The bending strength of the corrugated fin in the 1 st direction (the direction in which the fin members extend) is higher than the bending strength in the 2 nd direction in which the corrugated fin is formed into a corrugated shape. Therefore, by orienting the extending directions (1 st direction) of the fin members in the mutually intersecting directions, the mechanical strength of the bottom surface portion can be effectively improved.

When the fin member has portions extending in directions intersecting with each other, the fin member preferably includes a1 st fin and a2 nd fin arranged in the thickness direction of the bottom surface portion with respect to the 1 st fin, and the 1 st fin and the 2 nd fin extend in directions orthogonal to each other. With this configuration, the 1 st fin and the 2 nd fin are reinforced with each other, and therefore, the mechanical strength of the bottom surface portion can be effectively improved without depending on the direction in which the bending load acts, simply by arranging the fin members of the 1 st fin and the 2 nd fin so as to be orthogonal to each other. In this configuration, it is not necessary to form 1 fin member in a shape having portions extending in directions intersecting each other, and therefore the configuration of the fin member provided on the bottom surface portion can be simplified.

In the above-described configuration in which the fin member includes the 1 st fin and the 2 nd fin, the bottom surface portion preferably further includes a partition plate that is disposed between the upper surface plate and the lower surface plate and that partitions the hollow region into a1 st hollow region and a2 nd hollow region, the 1 st fin being disposed in the 1 st hollow region, and the 2 nd fin being disposed in the 2 nd hollow region. With this configuration, the hollow regions are partitioned by the partition plates, so that a plurality of laminated hollow regions (1 st hollow region, 2 nd hollow region) having the same basic structure can be provided in the bottom surface portion. Further, the mechanical strength of the bottom surface portion can be easily improved simply by changing the orientation of the fin members (the 1 st fin and the 2 nd fin) disposed in the plurality of hollow regions. Further, since the 1 st fin and the 2 nd fin are arranged as internal structures in the 1 st hollow region and the 2 nd hollow region partitioned by the separator, the separator can be integrated with the 1 st hollow region (the 1 st fin) and the 2 nd hollow region (the 2 nd fin) by brazing welding or the like, for example.

In this case, it is preferable that the 1 st hollow region is provided between the upper panel and the partition plate, and communicates with the refrigerant inlet and the refrigerant outlet, and the 2 nd hollow region is disposed on the lower surface side of the bottom surface portion than the 1 st hollow region, and is fluidly isolated from the 1 st hollow region. With this configuration, the following configuration can be adopted: the refrigerant is caused to flow only through the 1 st hollow region including the upper face plate for disposing the battery cells, and not through the 2 nd hollow region on the lower face side than the 1 st hollow region. Thus, the refrigerant flowing through the 1 st hollow region can effectively absorb the heat of the battery cells via the upper panel. Further, since the 2 nd hollow region does not need to form a flow path of the refrigerant, the structure can be simplified, and since it is not necessary to consider the flow of the refrigerant, the structure can be configured in which the weight reduction and the mechanical strength of the bottom surface portion are prioritized.

In the above-described invention 1, it is preferable that the refrigerant inlet and the refrigerant outlet are arranged along an edge portion of the hollow region, and the hollow region extends from the refrigerant inlet in a plane along the bottom surface portion, and then turns back at least once to be connected to the refrigerant outlet. With this configuration, the refrigerant inlet and the refrigerant outlet can be arranged on the same side of the hollow region. In the moving body, since the space margin is small, the restriction on the route design of the refrigerant pipe is large. Therefore, according to the above configuration, since the positions of the refrigerant inlet and the refrigerant outlet can be concentrated, the restriction on the path design of the refrigerant pipe in the cooler-integrated-for-moving-body battery tray can be alleviated.

In the above-described invention 1, the fin member is preferably formed in a range including an installation region of the plurality of battery cells in the bottom surface portion in a plane along the bottom surface portion. With this configuration, the fin member can be provided over a wide range including the installation region of the plurality of battery cells, thereby improving the heat conduction performance. Therefore, the temperature of each of the plurality of battery cells can be made uniform (temperature unevenness can be suppressed) over the entire region in which the battery cells are disposed. As a result, the operating temperatures of the respective battery cells can be made uniform, and therefore, the life of the battery cells can be extended and the power supply stability of the battery device can be improved.

The battery device for a mobile object according to claim 2 includes a battery cell, a battery tray for housing the battery cell, and a battery cover for covering the battery tray, the battery tray includes a concave tray main body including a bottom surface portion for housing the battery cell and a side surface portion rising from a periphery of the bottom surface portion, the bottom surface portion includes an upper panel, a lower panel, and a side wall disposed between the upper panel and the lower panel and integrally has a hollow region surrounded by the upper panel, the lower panel, and the side wall, and the bottom surface portion includes a refrigerant inlet and a refrigerant outlet communicating with the hollow region, and a fin member disposed in the hollow region.

In the mobile body battery device according to claim 2, as in the mobile body cooler-integrated battery tray according to claim 1, the size and weight of the battery device can be reduced and the cooling performance of the battery cells can be improved.

Effects of the invention

The size and weight of the battery device can be reduced and the cooling performance of the battery cell can be improved.

Drawings

Fig. 1 is a schematic perspective view showing a battery device according to the present embodiment.

Fig. 2 is a schematic exploded perspective view showing the battery tray.

Fig. 3 is a schematic sectional view showing an enlarged periphery of a fixing flange of a battery tray.

Fig. 4 is a schematic exploded perspective view for explaining the structure of the bottom surface portion.

Fig. 5 is a horizontal cross-sectional view showing a structural example of the 1 st hollow region.

Fig. 6 is a horizontal cross-sectional view showing a configuration example of the 2 nd hollow region.

Fig. 7 is a diagram for explaining a fluid circuit for supplying refrigerant to the battery device.

Fig. 8 is a diagram for explaining a relationship between the orientation of the fin member and the direction in which the bending load acts.

Fig. 9 is a horizontal cross-sectional view showing a bottom surface portion of a modification of the hollow region and the fin member.

Fig. 10 is a schematic diagram for explaining a modification in which a 3-stage hollow region is provided.

Fig. 11 is a horizontal cross-sectional view showing another modification of the hollow region.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The structure of a battery device 100 according to an embodiment will be described with reference to fig. 1 to 7. The battery device 100 is mounted on a mobile body 101 (see fig. 7), and is a device for storing electric power supplied to a motor and various electric power demand devices in the mobile body 101. The battery device 100 is an example of the "battery device for mobile body" in the claims.

The mobile body 101 includes an automobile, a railway vehicle, a ship, an airplane, and the like. In the present embodiment, the movable body 101 is an electric vehicle including an electric motor that operates using electric power as a main drive source, such as an electric vehicle, a hybrid vehicle, or a fuel cell vehicle.

As shown in fig. 1, the battery device 100 includes a battery cell 1, a battery tray 2, and a battery cover 3. The battery tray 2 is an example of the "cooler-integrated mobile battery tray" of the claims.

The battery cell 1 is a secondary battery. For example, the battery cell 1 is a lithium ion battery, but the type of battery is not particularly limited. In the present specification, a battery cell refers to a single cell. In the example of fig. 1, the battery cell 1 is an angular battery having a rectangular parallelepiped shape. The battery device 100 can accommodate a plurality of battery cells 1. The plurality of battery cells 1 are arranged on the battery tray 2.

The battery tray 2 and the battery cover 3 constitute a case that accommodates a plurality of battery cells 1. A plurality of battery cells 1 are disposed on the battery tray 2. The battery tray 2 constitutes a lower portion of the case and supports the lower surface side of the plurality of battery cells 1. The battery cover 3 constitutes an upper portion of the case, and is configured to be attachable to the upper surface of the battery tray 2 in a state of covering the upper surface of the battery tray 2. Each battery cell 1 is held in a fixed state in the case by a holder or a holding member (not shown) such as a bracket.

The battery tray 2 includes a concave tray main body 20 including a bottom surface portion 21 on which the plurality of battery cells 1 are provided, and a side surface portion 22 rising from a peripheral edge of the bottom surface portion 21. The upper surface of the bottom portion 21 has a plurality of installation regions 23 for the battery cells 1. The setting region 23 is a flat surface. The battery tray 2 may be configured to be able to provide devices other than the battery cells 1. For example, in fig. 1, the battery tray 2 has an installation area 24 for installing the electronic device 4 in addition to the installation area 23 of the battery cell 1. For example, the electronic device 4 includes a BMS (battery management system) of the battery device 100 and the like.

The battery cover 3 has an external shape corresponding to the battery tray 2 in a plan view. In the example of fig. 1, the battery cover 3 includes an upper surface portion 31, and a side surface portion 32 extending downward (on the battery tray 2 side) from the periphery of the upper surface portion 31.

The battery tray 2 and the battery cover 3 are configured to seal an internal space for disposing the battery cell 1 in a watertight state. The battery tray 2 and the battery cover 3 are made of, for example, aluminum alloy or aluminum.

Here, the battery device 100 of the present embodiment can receive the coolant 5 supplied from the outside and circulate the coolant in the battery tray 2. The battery device 100 is configured to be able to adjust the temperature of the battery cells 1 mounted on the battery tray 2 by the refrigerant 5 flowing through the battery tray 2. Hereinafter, a specific structure of the battery tray 2 will be described.

(Battery tray)

In the example shown in fig. 2, the tray main body 20 has the following structure: the cooling member 25 and the plate member 26 constituting the bottom surface portion 21 and the frame 27 constituting the side surface portion 22 are integrally welded to each other. Examples of the Welding method include melt Welding and solid-phase Welding, and examples of the solid-phase Welding include Friction Stir Welding (FSW).

The cooling member 25 and the plate member 26 have a flat plate shape. The cooling member 25 has a rectangular shape having a size corresponding to the installation region 23 of the plurality of battery cells 1. The plate member 26 has a trapezoidal shape having a size corresponding to the installation area 24 of the electronic apparatus 4. The plate member 26 is connected (welded) to the end surface of the cooling member 25 on the longitudinal side.

The frame 27 has a frame-like shape. The frame 27 surrounds the outer periphery of the bottom surface portion 21 in which the cooling member 25 and the plate member 26 are combined. The frame 27 extends upward (the battery cover 3 side) by a predetermined height. A plurality of screw holes 27b are provided in the upper end surface 27a of the frame 27. Further, fixing flange flanges 28 protruding outward are provided on both side surfaces of the frame 27 in the short side direction, respectively. The fixing flange 28 is provided with a fixing through-hole 28 a.

As shown in fig. 3, a flange 33 is formed on the side surface part 32 of the battery cover 3 to be attached to the upper end surface 27a of the frame 27. The battery cover 3 is mounted on the battery tray 2 by coupling the bolts 34 to the screw holes 27b through the through holes 33a formed in the flange portion 33. The fixing flange 28 of the frame 27 is disposed on a mounting portion 102 such as a chassis of the movable body 101, and is coupled to the mounting portion 102 by a bolt 103 inserted into the through hole 28 a. Thereby, the battery device 100 is fixed to the mobile body 101. The battery cells 1 in the battery device 100 are held in a state of close contact with the upper surface of the bottom surface portion 21 via the heat conductive sheet 90 and the like.

(bottom surface)

As shown in fig. 3, the bottom surface portion 21 includes an upper panel 41, a lower panel 42, and a side wall 43 disposed between the upper panel 41 and the lower panel 42, and integrally has a hollow region 50 surrounded by the upper panel 41, the lower panel 42, and the side wall 43. The bottom surface portion 21 includes a refrigerant inlet 44 and a refrigerant outlet 45 (see fig. 2) communicating with the inside of the hollow region 50, and a fin member 60 disposed in the hollow region 50.

In the present embodiment, the cooling member 25 shown in fig. 2 integrally includes an upper surface plate 41, a lower surface plate 42, and a hollow region 50 (see fig. 3) surrounded by a side wall 43 in the bottom surface portion 21, and has a structure including a refrigerant inlet 44 and a refrigerant outlet 45, and a fin member 60. The plate member 26 is a solid flat plate, and the plate member 26 may have the same structure as the cooling member 25.

The structure of the bottom surface portion 21 (cooling member 25) will be described with reference to fig. 4. Fig. 4 is a schematic diagram for explaining the configuration of the bottom surface portion 21 having the hollow region 50, and the configuration examples shown in fig. 1 and 2 do not match with the scale, the size ratio, and the like. In fig. 4, the refrigerant inlet 44 and the refrigerant outlet 45 are not shown.

The upper panel 41 and the lower panel 42 are flat plate members having the same shape in a plan view. In fig. 4, the upper panel 41 and the lower panel 42 have a rectangular shape. The upper panel 41 and the lower panel 42 face each other in the thickness direction of the bottom surface portion 21. The upper panel 41 is disposed at the uppermost portion (closest to the battery cover 3) of the bottom surface portion 21 (cooling member 25). The surface of the upper plate 41 constitutes the installation surface of the battery cell 1 on the bottom surface 21 (cooling member 25). The lower panel 42 is disposed at the lowermost portion of the bottom surface portion 21 (cooling member 25). The surface of the lower panel 42 constitutes the lower surface of the bottom surface portion 21.

The side wall 43 is provided between the upper panel 41 and the lower panel 42 along the peripheral edges of the upper panel 41 and the lower panel 42. In the example of fig. 4, the side wall 43 integrates 4 columnar members (side pillars) along each side of the upper panel 41 (lower panel 42) and has a rectangular frame-like shape.

The hollow region 50 is a space formed inside the bottom surface portion 21 (cooling member 25) by the upper panel 41, the lower panel 42, and the side wall 43. The hollow region 50 has a planar shape of the side wall 43 by an amount corresponding to less than the upper panel 41 (lower panel 42), and has a height corresponding to the thickness of the side wall 43.

The fin member 60 is constituted by a corrugated fin. That is, the fin member 60 is a plate member extending in the 1 st direction and bent in a wave shape toward the 2 nd direction orthogonal to the 1 st direction. As the corrugated fins constituting the fin member 60, for example, flat fins (straight fins) shown in fig. 4 can be used, but perforated fins, louver fins, herringbone fins (corrugated fins), zigzag fins (off-set fins), and the like may be used.

In the present embodiment, the fin member 60 has portions extending in the direction along the bottom surface portion 21 and in the direction intersecting each other. Specifically, the fin member 60 includes the 1 st fin 61 and the 2 nd fin 62 arranged in the thickness direction of the bottom surface portion 21 with respect to the 1 st fin 61. The 1 st fin 61 and the 2 nd fin 62 extend in directions orthogonal to each other.

In the configuration example of fig. 4, the bottom surface portion 21 has a plurality of hollow regions 50 stacked in the thickness direction, and the 1 st fin 61 and the 2 nd fin 62 are disposed in different hollow regions 50. That is, the bottom surface portion 21 is disposed between the upper panel 41 and the lower panel 42, and includes a partition plate 46 that partitions the hollow region 50 into a1 st hollow region 51 and a2 nd hollow region 52. Further, the 1 st fin 61 is disposed in the 1 st hollow region 51, and the 2 nd fin 62 is disposed in the 2 nd hollow region 52. In fig. 3 and 4, an example in which 1 partition 46 is provided between the upper surface plate 41 and the lower surface plate 42 to form 2-stage hollow regions (the 1 st hollow region 51 and the 2 nd hollow region 52) is shown, but 2 or more partitions 46 may be provided to form 3 or more-stage hollow regions 50.

The 1 st hollow region 51 is provided between the upper panel 41 and the partition plate 46. That is, the 1 st hollow region 51 is disposed at the uppermost stage of the multi-stage hollow region 50 and is adjacent to the upper panel 41. The 1 st hollow region 51 is adjacent to the battery cell 1 provided on the bottom surface portion 21 via the upper panel 41. The 1 st fin 61 disposed in the 1 st hollow region 51 is provided in contact with the top surface plate 41 and the partition plate 46, respectively. That is, the 1 st fin 61, which is a corrugated fin, is in contact with the upper panel 41 at the upper end of the corrugated cross section and in contact with the spacer 46 at the lower end of the corrugated cross section.

The 1 st hollow region 51 communicates with the refrigerant inlet 44 and the refrigerant outlet 45. As shown in fig. 2, the upper plate 41 is formed with through-holes constituting a refrigerant inlet 44 and a refrigerant outlet 45. The refrigerant inlet 44 and the refrigerant outlet 45 penetrate the upper panel 41 in the thickness direction and communicate with the 1 st hollow region 51 directly below the upper panel 41. Connectors 47 for connecting to pipes are provided at openings of the refrigerant inlet 44 and the refrigerant outlet 45, respectively.

Thereby, the refrigerant 5 flows into the 1 st hollow region 51 through the refrigerant inlet 44 from the outside, and the refrigerant 5 having passed through the 1 st hollow region 51 flows out from the refrigerant outlet 45 to the outside. The 1 st hollow region 51 is a refrigerant flow path of the bottom surface portion 21, and is a region for exchanging heat between the refrigerant 5 flowing inside and the battery cells 1 on the top panel 41.

The 2 nd hollow region 52 is disposed on the lower surface side of the bottom surface portion 21 with respect to the 1 st hollow region 51. In the example of fig. 4, the 2 nd hollow area 52 is divided by the partition 46 and the lower panel 42. When 3 or more hollow regions 50 are provided, the 2 nd hollow region 52 may be a space partitioned by the pair of opposing partition plates 46.

In fig. 4, the 2 nd fin 62 disposed in the 2 nd hollow region 52 is provided in contact with the partition plate 46 and the lower panel 42, respectively. That is, the 2 nd fin 62, which is a corrugated fin, is in contact with the spacer 46 at the upper end of the corrugated cross section and in contact with the lower panel 42 at the lower end of the corrugated cross section. When 3 or more hollow regions 50 are provided, the 2 nd fin 62 of the 2 nd hollow region 52 disposed in the middle is in contact with the upper and lower separators 46 facing each other.

In the present embodiment, the 2 nd hollow region 52 is fluidly isolated from the 1 st hollow region 51. That is, the partition 46 is not provided with a passage (through hole) for communicating the 1 st hollow region 51 with the 2 nd hollow region 52. The refrigerant 5 does not flow into the 2 nd hollow area 52.

The cooling member 25 has the following structure: the upper plate 41, the lower plate 42, the side wall 43, the spacer 46, and the fin member 60 (the 1 st fin 61 and the 2 nd fin 62) that partition the hollow region 50 are integrated by brazing. That is, the upper surface plate 41, the lower surface plate 42, the side wall 43, the spacer 46, and the fin member 60 are coated or coated with the brazing material. Specifically, the lower surface of the upper plate 41, the upper surface of the lower plate 42, and both surfaces of the separator 46 are weld surfaces, and a brazing material is applied or coated on these weld surfaces. As shown in fig. 4, the assembly in which the components are arranged is configured to form a hollow region 50, and the components constituting the cooling member 25 are welded at one time by heating the assembly to melt the brazing material and then cooling the assembly. The hollow region 50 is formed as a liquid-tight space by being integrated by brazing. In the present embodiment, only the 1 st hollow region 51 communicates with the outside via the refrigerant inlet 44 and the refrigerant outlet 45.

(example of hollow region construction)

Fig. 5 shows an example of the structure (planar shape) of the 1 st hollow region 51, and fig. 6 shows an example of the structure (planar shape) of the 2 nd hollow region 52. The longitudinal direction of the cooling member 25 is defined as the a direction, and the short direction is defined as the B direction.

In the present embodiment, the refrigerant inlet 44 and the refrigerant outlet 45 are arranged along the edge of the hollow region 50 (1 st hollow region 51), and the hollow region 50 extends from the refrigerant inlet 44 in a plane along the bottom surface portion 21, and then turns back at least once to be connected to the refrigerant outlet 45. In the present embodiment, the 1 st hollow region 51 of the hollow regions 50 has a folded structure.

As shown in fig. 5, the refrigerant inlet 44 and the refrigerant outlet 45 are arranged in the short side direction (direction B) at one end (end in the a1 direction) in the a direction of the hollow region 50 (the 1 st hollow region 51). The 1 st hollow region 51 has a partition wall 53 at the center in the short side direction (B direction). The partition wall 53 extends from a side wall 43a at the end in the a1 direction where the refrigerant inlet 44 and the refrigerant outlet 45 are arranged to the front of a side wall 43b at the end in the a2 direction in the a2 direction. The 1 st hollow region 51 is partitioned into U-shapes by a partition wall 53. The partition wall 53 is formed by integrating the columnar member with the upper panel 41 and the partition plate 46 by brazing, similarly to the side wall 43.

The 1 st hollow region 51 is partitioned into a side wall 43 and a partition wall 53, and has an outward path 51a, a connection path 51b, and a return path 51 c.

The outward path 51a extends linearly in the a direction from just below the refrigerant inlet 44. The outward path 51a is connected to the connection path 51b at an end on the a2 direction side.

The connection path 51b connects the outgoing path 51a and the return path 51 c. The connecting path 51B is provided at an end of the 1 st hollow region 51 in the a2 direction and extends in the B direction.

The circuit 51c extends straight in the a direction from the connecting path 51b at the end in the a2 direction to just below the refrigerant outlet 45.

The outward path 51a and the return path 51c are arranged in the direction B with a partition 53 therebetween. The outward path 51a and the return path 51c are provided with the 1 st fin 61, respectively. The 1 st fin 61 is provided substantially over the entire range of the outward path 51a and the return path 51c extending in the a direction.

In addition, the 1 st fin 61 is provided in the entire regions of the outward path 51a and the circuit 51c except for the distribution portion 51d immediately below the refrigerant inlet 44 in the outward path 51a and the collection portion 51e immediately below the refrigerant outlet 45 in the circuit 51 c. The distribution portion 51d extends in the direction B over the entire width of the outward path 51a, and is a flow path portion for distributing the refrigerant 5 flowing from the refrigerant inlet 44 in the region where the 1 st fin 61 is formed. The collecting portion 51e extends in the B direction over the entire width of the circuit 51c, and is a flow path portion for collecting the refrigerant 5 flowing out of the region where the 1 st fin 61 is formed at the refrigerant outlet 45.

The fin member 60 is formed in a region of the installation region 23 (dotted line portion) of the plurality of battery cells 1 including the bottom surface portion 21, in a plane along the bottom surface portion 21. That is, the 1 st fin 61 provided in the 1 st hollow region 51 has a length L1 in the a direction and a length L2 in the B direction. In addition, since the partition wall 53 is sufficiently small, it is included in the formation range of the 1 st fin 61. In fig. 5, for convenience, only a part of the 1 st fin 61 is illustrated, and the remaining part is omitted.

The installation region 23 of the battery cell 1 has a length L11 in the a direction and a length L12 in the B direction. The lengths L1 and L2 of the formation range of the 1 st fin 61 are equal to or longer than the lengths L11 and L12 of the installation region 23, respectively.

As shown in fig. 6, the partition wall 53 is not provided in the 2 nd hollow region 52, and the 2 nd hollow region 52 has a rectangular shape surrounded by the side wall 43 in a plan view. Since the refrigerant 5 does not flow through the 2 nd hollow region 52, the distribution portion 51d, the collection portion 51e, and the connection path 51b are not provided in the 2 nd hollow region 52. A2 nd fin 62 extending in the B direction is provided in the entire range of the 2 nd hollow region 52. Therefore, the 1 st fin 61 extending in the a direction in the 1 st hollow region 51 and the 2 nd fin 62 extending in the B direction in the 2 nd hollow region 52 extend in mutually orthogonal directions. In fig. 6, for convenience, only a part of the 2 nd fin 62 is illustrated, and the remaining part is omitted.

(connection to a fluid circuit)

As shown in fig. 7, the 1 st hollow region 51 is connected to a fluid circuit 110 provided in the mobile body 101 via a refrigerant inlet 44 and a refrigerant outlet 45. The fluid circuit 110 includes, for example, a pipe 111, a pump 112, and a heat exchanger 113. The pipe 111 is fluidly connected to the battery device 100 (the battery tray 2), the pump 112, and the heat exchanger 113, and thereby constitutes a circulation path of the refrigerant 5 among the pump 112, the heat exchanger 113, and the 1 st hollow space 51. The pump 112 circulates the refrigerant 5 in the circulation path. The heat exchanger 113 releases heat absorbed by the refrigerant 5 in the 1 st hollow region 51 by heat exchange. For example, the heat exchanger 113 may be a radiator of the mobile body 101, or may be a part of an air conditioner provided in the mobile body 101.

With such a configuration, the refrigerant 5 supplied to the battery tray 2 passes through the outward passage 51a, the connection passage 51b, and the return passage 51c in order in the 1 st hollow region 51 (see fig. 5), and exchanges heat with the battery cell 1 while passing therethrough. In each battery cell 1, heat generated during charge and discharge is absorbed by the refrigerant 5. The refrigerant 5 is sent from the battery tray 2 to the heat exchanger 113, releases the absorbed heat, and is circulated and supplied to the battery tray 2 again. Here, the cooling of the battery cell 1 will be described, and for example, in a low-temperature environment in winter, the heat absorbed by the refrigerant 5 in the heat exchanger 113 can be supplied to the battery cell 1 in a low-temperature state by heat exchange.

The refrigerant 5 is liquid. The refrigerant 5 may be water, an antifreeze solution containing water as a main component, or other liquid. In the present embodiment, the refrigerant 5 flows through the circulation path in a liquid phase, but may be caused to undergo a phase change (evaporation, condensation) during the circulation. That is, the battery tray 2 may be configured as an evaporator, or may be cooled by latent heat of vaporization of the refrigerant 5.

(Effect of the present embodiment)

In the present embodiment, the following effects can be obtained.

In the battery tray 2 and the battery device 100 according to the present embodiment, as described above, the bottom surface portion 21 includes the upper surface plate 41 and the lower surface plate 42, and the side wall 43 disposed between the upper surface plate 41 and the lower surface plate 42, and integrally has the hollow region 50 surrounded by the upper surface plate 41, the lower surface plate 42, and the side wall 43, and the bottom surface portion 21 includes the refrigerant inlet 44 and the refrigerant outlet 45 communicating with the inside of the hollow region 50, and the fin member 60 disposed in the hollow region 50. Therefore, a hollow region 50 through which a refrigerant can flow is integrally formed in the bottom surface portion 21 where the battery cell 1 is provided. Thus, the bottom surface portion 21 of the battery tray 2 itself can be configured as a cooling device for the battery cells 1, and therefore, it is not necessary to separately dispose a cooling device (such as a fan) above the battery tray 2. As a result, the space for the cooling device above the battery tray 2 can be reduced, and therefore, the size of the battery device 100 can be reduced. Further, since the bottom surface portion 21 includes the hollow region 50 in addition to the need for providing the cooling device, the weight of the battery device 100 can be reduced as compared with a case where the entire bottom surface portion 21 is formed of a solid plate member, for example. Moreover, since the battery cells 1 can be cooled from the lower surface side of the battery cells 1 by the bottom surface portions 21, the plurality of battery cells 1 can be uniformly cooled. Further, since the fin member 60 is disposed in the hollow region 50 through which the refrigerant flows, the strength of the hollow bottom portion 21 can be increased, and the heat conduction performance of the bottom portion 21 can be improved. By this, the size and weight of the battery device 100 can be reduced, and the cooling performance of the battery cell 1 can be improved.

In the present embodiment, the fin member 60 has portions extending in the direction along the bottom surface portion 21 and in the direction intersecting each other. Since the fin member 60 has high mechanical strength against the bending load in the direction in which the fin member 60 extends, the mechanical strength of the entire bottom surface portion 21 can be improved without depending on the direction in which the bending load acts. Therefore, by making the bottom surface portion 21 of the battery tray 2 hollow, it is possible to reduce the weight and easily secure the mechanical strength necessary for holding the plurality of battery cells 1.

In particular, in the corrugated fin having the corrugated shape shown in fig. 3, the bending strength in the longitudinal direction (direction in which the fin member 60 extends) formed in a straight line shape is structurally higher than the bending strength in the width direction formed in a corrugated shape. For example, as shown in fig. 8, the fin member 60 (the 1 st fin 61) extending in the a direction has high strength against the bending load F1 in the a direction. The fin member 60 (the 2 nd fin 62) extending in the B direction is high in strength against the bending load F2 in the B direction. Therefore, as shown in fig. 8, by orienting the extending directions of the fin members 60 in the directions (a direction and B direction) intersecting each other, the mechanical strength of the bottom surface portion 21 can be effectively improved. In fig. 8, the plurality of fin members 60 are oriented in the direction intersecting with each other, but the effect of improving the mechanical strength can be similarly obtained also in the case where 1 fin member 60 is bent to have a portion oriented in the direction intersecting with each other.

In the present embodiment, the fin members 60 include the 1 st fin 61 and the 2 nd fin 62, and the 1 st fin 61 and the 2 nd fin 62 extend in the directions orthogonal to each other, so that the mechanical strength of the bottom surface portion 21 can be improved simply by disposing the fin members 60 of the 1 st fin 61 and the 2 nd fin 62 so as to be orthogonal to each other. That is, as shown in fig. 8, the direction (B direction) in which the bending strength of the 1 st fin 61 is relatively low and the direction (B direction) in which the bending strength of the 2 nd fin 62 is relatively high coincide. The direction (direction a) in which the bending strength of the 2 nd fin 62 is relatively low coincides with the direction (direction a) in which the bending strength of the 1 st fin 61 is relatively high. As a result, the 1 st fin 61 and the 2 nd fin 62 reinforce each other, and therefore the mechanical strength of the bottom surface portion 21 can be effectively improved without depending on the direction in which the bending load acts. Further, in this configuration, it is not necessary to form 1 fin member 60 in a shape having portions extending in directions intersecting each other, and therefore the configuration of the fin member 60 provided on the bottom surface portion 21 can be simplified.

In the present embodiment, since the 1 st fin 61 is disposed in the 1 st hollow region 51 partitioned by the partition plate 46 and the 2 nd fin 62 is disposed in the 2 nd hollow region 52 partitioned by the partition plate 46, the plurality of laminated hollow regions 50 (the 1 st hollow region 51, the 2 nd hollow region 52) having the same basic configuration can be provided in the bottom surface portion 21 by partitioning the hollow regions 50 by the partition plate 46. Further, the mechanical strength of the bottom surface portion 21 can be easily improved simply by orienting the fin members 60 (the 1 st fin 61, the 2 nd fin 62) disposed in the plurality of hollow regions 50. Further, since the 1 st fin 61 and the 2 nd fin 62 are arranged as internal structures in the 1 st hollow region 51 and the 2 nd hollow region 52 partitioned by the partition plate 46, the partition plate 46 can be integrated with the 1 st hollow region 51 (the 1 st fin 61) and the 2 nd hollow region 52 (the 2 nd fin 62) by brazing welding or the like, for example.

In the present embodiment, the 1 st hollow region 51 is provided between the upper panel 41 and the partition plate 46 and communicates with the refrigerant inlet 44 and the refrigerant outlet 45, and the 2 nd hollow region 52 is disposed on the lower surface side of the bottom surface portion 21 with respect to the 1 st hollow region 51 and fluidly isolated from the 1 st hollow region 51, so that the following configuration can be adopted: the refrigerant is caused to flow only through the 1 st hollow region 51 including the upper surface plate 41 for disposing the battery cell 1, and is not caused to flow through the 2 nd hollow region 52 on the lower surface side than the 1 st hollow region 51. This enables the refrigerant flowing through the 1 st hollow region 51 to efficiently absorb heat of the battery cell 1 via the top plate 41. Further, since the 2 nd hollow region 52 does not need to form a refrigerant flow path, the structure can be simplified, and since it is not necessary to consider the flow of the refrigerant, the weight reduction and the mechanical strength of the bottom surface portion 21 can be prioritized.

In the present embodiment, the refrigerant inlet 44 and the refrigerant outlet 45 are arranged along the edge of the hollow region 50 (1 st hollow region 51), and the hollow region 50 (1 st hollow region 51) extends from the refrigerant inlet 44 in the plane along the bottom surface portion 21, and then turns back at least once to be connected to the refrigerant outlet 45, so that the refrigerant inlet 44 and the refrigerant outlet 45 can be arranged on the same side with respect to the hollow region 50. The above configuration in which the positions of the refrigerant inlet 44 and the refrigerant outlet 45 can be concentrated is particularly useful because the restriction on the piping path of the battery tray 2 for a mobile body can be alleviated because the amount of space remaining in the mobile body tends to be small and the restriction on the piping path of the refrigerant tends to be large. In fig. 5, although the 1 st hollow region 51 is shown as having a structure in which it is folded back once, the same effect can be obtained even if the 1 st hollow region 51 is folded back 2 times or more.

In the present embodiment, the fin members 60 are formed in the bottom surface portion 21 in the range of the installation region 23 including the plurality of battery cells 1 in the plane along the bottom surface portion 21, and therefore the heat conduction performance can be improved by installing the inner fin members 60 in a wide range of the installation region 23 including the plurality of battery cells 1. Therefore, the temperature of each of the plurality of battery cells 1 can be made uniform (temperature unevenness can be suppressed) over the entire installation region 23 of the battery cell 1. As a result, since the operating temperature of each battery cell 1 can be made uniform, the life of the battery cell 1 can be extended, and the power supply stability of the battery device 100 can be improved.

(modification example)

In addition, the embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present invention is defined by the claims, and is not limited to the description of the above embodiments, and includes all modifications (variations) that are equivalent to the meanings of the claims and that are within the scope.

For example, in the above-described embodiment, the example in which the hollow region 50 is partitioned into the 1 st hollow region 51 and the 2 nd hollow region 52 by providing the partition plate 46 is shown, but the present invention is not limited thereto. In the present embodiment, the partition plate 46 may not be provided. That is, only the 1 st hollow region 50 may be provided instead of the multi-stage hollow region 50 in which the 1 st hollow region 51 and the 2 nd hollow region 52 are provided.

In the above embodiment, the 1 st fin 61 is provided in the 1 st hollow region 51, and the 2 nd fin 62 is provided in the 2 nd hollow region 52, but the present invention is not limited to this. In the present invention, only 1 fin member 60 may be provided instead of the plurality of fin members 60 of the 1 st fin 61 and the 2 nd fin 62. In particular, in the structure in which only the 1-stage hollow region 50 is provided, only 1 fin member 60 may be provided.

In the above embodiment, the 1 st fin 61 and the 2 nd fin 62 extending in the mutually orthogonal directions are provided, but the present invention is not limited to this. In the present invention, instead of providing the plurality of fin members 60 of the 1 st fin 61 and the 2 nd fin 62 to extend in the mutually orthogonal directions, it is possible that the 1 st fin member 60 has a plurality of portions extending in the mutually orthogonal directions. For example, in the modification shown in fig. 9, 1 fin member 160 having a plurality of portions extending in mutually orthogonal directions is provided in 1 hollow region 50.

In fig. 9, the hollow area 50 is partitioned into curves by a plurality of partition walls 53, and the fin member 160 is provided so as to curve along the hollow area 50. The fin member 160 includes a1 st portion 160a extending in the B direction and a2 nd portion 160B extending in the a direction orthogonal to the 1 st portion 160 a. In this modification, the 1 st portion 160a has a high bending strength in the B direction, and the 2 nd portion 160B has a high bending strength in the a direction. Therefore, even with 1 fin member 160, the mechanical strength can be improved without depending on the direction in which the bending load acts.

In the above embodiment, the 2 nd hollow region 52 and the 1 st hollow region 51 are fluidly isolated from each other so that the refrigerant 5 flows only through the 1 st hollow region 51, but the present invention is not limited thereto. In the present invention, the 2 nd hollow region 52 and the 1 st hollow region 51 may be communicated (fluidly connected), and the refrigerant 5 may be caused to flow also through the 2 nd hollow region 52. In the configuration in which the plurality of second hollow regions 52 are provided by providing the plurality of partition plates 46, the second hollow region 52 in which the refrigerant 5 flows and the second hollow region 52 in which the refrigerant 5 does not flow may be provided. For example, in the modification of fig. 10, the bottom surface portion 21 includes a1 st hollow region 151 and 2 nd hollow regions 152a and 152 b. In the 1 st hollow region 151 and the 2 nd hollow region 152b on the lower surface plate 42 side, the refrigerant 5 flows through the through-holes 153 formed in the partition plates 46. The center 2-th hollow region 152a partitioned by the 2 partitions 46 is isolated from the flow path of the refrigerant 5 by the partitions 46 and the partition 53, and therefore the refrigerant 5 does not flow. In the modification of fig. 10, the 1 st fin of the 1 st hollow region 151 and the 2 nd fin of the 2 nd hollow region 152B extend in the a direction, and the 2 nd fin 62 of the 2 nd hollow region 152a extends in the B direction (direction orthogonal to the paper surface of fig. 10).

In the above embodiment, the 1 st hollow region 51 is extended from the refrigerant inlet 44 in the plane along the bottom surface portion 21, and then is turned back at least once to be connected to the refrigerant outlet 45, but the present invention is not limited to this. For example, in fig. 5, the 1 st hollow region 51 having no fold back may be formed by not providing the partition wall 53. In this case, the following configuration may be adopted: the refrigerant outlet 45 is disposed at the end portion in the a2 direction (the formation position of the connection path 51b in fig. 5), and the refrigerant 5 flows in the a2 direction from the refrigerant inlet 44 at the end portion in the a1 direction toward the refrigerant outlet 45 at the end portion in the a2 direction.

In the above-described embodiment, the cooling member 25 constituting the installation region 23 of the battery cell 1 and the plate member 26 constituting the installation region 24 of the electronic device 4 are welded and integrated to constitute the bottom surface portion 21, but the present invention is not limited thereto. For example, the bottom surface portion 21 may be configured by 1 cooling member 25 that configures both the installation region 23 of the battery cell 1 and the installation region 24 of the electronic device 4. In other words, the hollow region 50 may be formed so as to extend within a range including both the installation region 23 of the battery cell 1 and the installation region 24 of the electronic device 4.

For example, in the modification shown in fig. 11, the hollow region 250 may be formed as follows: after passing through the range overlapping with the setting region 23 of the battery cell 1, pass through the range overlapping with the setting region 24 of the electronic apparatus 4. That is, the hollow region 250 has the 1 st refrigerant passage portion 251 formed in a range that overlaps the installation region 23 of the battery cell 1 with the outward path 51a, the connection path 51b, and the circuit 51 c. Further, the hollow region 250 has the following 2 nd refrigerant passage portion 252: extends from the 1 st refrigerant passage portion 251 (end portion in the a1 direction of the circuit 51 c) to pass through a range overlapping with the installation region 24 of the electronic device 4. The refrigerant 5 supplied from the refrigerant inlet 44 exchanges heat with the battery cell 1 (cools the battery cell 1) while passing through the 1 st refrigerant passage portion 251, and then exchanges heat with the electronic equipment 4 (cools the electronic equipment 4) while passing through the 2 nd refrigerant passage portion 252, thereby being discharged from the refrigerant outlet 45. According to the battery tray 2 of this modification, not only the battery cells 1 but also the electronic devices 4 mounted on the battery device 100 can be cooled.

In the above-described embodiment, the example in which the battery tray 2 (bottom surface portion 21) is provided with not only the installation region 23 of the battery cell 1 but also the installation region 24 of the electronic device 4 is shown, but the present invention is not limited to this. In the present invention, the installation region 24 of the electronic device 4 may not be provided in the bottom surface portion 21. At least the installation region 23 of the battery cell 1 may be provided in the bottom surface portion 21. In addition, in the bottom surface portion 21, in addition to the installation region 23 in which the battery cell 1 is installed, an installation region other than the installation region 24 in the electronic device 4 may be installed.

The planar shape of the bottom surface portion 21 is arbitrary. In fig. 2, the bottom surface portion 21 is shown in a shape in which the rectangular cooling member 25 and the trapezoidal plate member 26 are combined, but the bottom surface portion 21 may have any shape such as a quadrangular shape, another polygonal shape, an elliptical shape, another rounded shape, a ring shape, or a U-shape in a plan view.

In the above embodiment, the refrigerant inlet 44 and the refrigerant outlet 45 are provided in the upper panel 41 of the bottom portion 21, but the present invention is not limited to this. The refrigerant inlet 44 and the refrigerant outlet 45 may be provided in any portion of the bottom surface 21 as long as they are formed to communicate with the hollow region 50 (the 1 st hollow region 51). For example, the refrigerant inlet 44 and the refrigerant outlet 45 may be provided in the lower panel 42 of the bottom portion 21 or in the side wall 43. For example, the refrigerant inlet 44 and the refrigerant outlet 45 may be provided so as to penetrate the side wall 43 and the frame 27 constituting the side surface portion 22 and open to the outside.

In the above-described embodiment, the battery cell 1 is an angular battery, but the present invention is not limited to this. The battery cell may be a battery cell other than a cylindrical battery having a cylindrical shape or a laminate battery having a pouch shape.

Description of the symbols

1-battery cell, 2-battery tray (cooler-integrated-type battery tray for mobile body), 3-battery lid, 5-refrigerant, 20-tray main body, 21-bottom surface portion, 22-side surface portion, 23-setting region, 41-upper panel, 42-lower panel, 43a, 43 b-side wall, 44-refrigerant inlet, 45-refrigerant outlet, 46-partition, 50, 250-hollow region, 51, 151-1 st hollow region, 52, 152a, 152 b-2 nd hollow region, 60, 160-fin member (corrugated fin), 61-1 st fin (corrugated fin), 62-2 nd fin (corrugated fin), 100-battery device (battery device for mobile body), 101-mobile body.

Claims (9)

1. A cooler-integrated battery tray for a mobile body, comprising:

a concave tray body including a bottom surface portion on which the battery cell is mounted and a side surface portion rising from a peripheral edge of the bottom surface portion,

the bottom surface portion includes an upper panel, a lower panel, and a side wall disposed between the upper panel and the lower panel and integrally has a hollow region surrounded by the upper panel, the lower panel, and the side wall,

the bottom surface portion includes a refrigerant inlet and a refrigerant outlet communicating with the hollow region, and a fin member disposed in the hollow region.

2. The cooler-integrated battery tray for a moving body according to claim 1, wherein,

the fin member has portions extending in a direction along the bottom surface portion and in directions intersecting each other.

3. The cooler-integrated battery tray for a moving body according to claim 2, wherein,

the fin member is a corrugated fin extending in a1 st direction and bent into a wave shape toward a2 nd direction orthogonal to the 1 st direction.

4. The cooler-integrated battery tray for a moving body according to claim 2, wherein,

the fin member includes a1 st fin and a2 nd fin arranged in the thickness direction of the bottom surface portion with respect to the 1 st fin,

the 1 st fin and the 2 nd fin extend in mutually orthogonal directions.

5. The cooler-integrated battery tray for a moving body according to claim 4, wherein,

the bottom surface portion further includes a partition plate disposed between the upper panel and the lower panel and dividing the hollow area into a1 st hollow area and a2 nd hollow area,

the 1 st fin is disposed in the 1 st hollow region,

the 2 nd fin is disposed in the 2 nd hollow region.

6. The cooler-integrated battery tray for a moving body according to claim 5,

the 1 st hollow region is provided between the upper panel and the partition plate and communicates with the refrigerant inlet and the refrigerant outlet,

the 2 nd hollow region is disposed at a position closer to a lower surface side of the bottom surface portion than the 1 st hollow region, and is fluidly isolated from the 1 st hollow region.

7. The cooler-integrated battery tray for a moving body according to claim 1, wherein,

the refrigerant inlet and the refrigerant outlet are arranged along an edge of the hollow region,

the hollow region extends from the refrigerant inlet in a plane along the bottom surface portion, and then turns back at least once to be connected to the refrigerant outlet.

8. The cooler-integrated battery tray for a moving body according to claim 1, wherein,

the fin member is formed in a plane along the bottom surface portion within a range of an installation region including the plurality of battery cells in the bottom surface portion.

9. A battery device for a mobile body, comprising:

a battery cell, a battery tray for arranging the battery cell and a battery cover for covering the battery tray,

the battery tray includes a concave tray main body including a bottom surface portion on which the battery cell is mounted and a side surface portion rising from a peripheral edge of the bottom surface portion,

the bottom surface portion includes an upper panel, a lower panel, and a side wall disposed between the upper panel and the lower panel and integrally has a hollow region surrounded by the upper panel, the lower panel, and the side wall,

the bottom surface portion includes a refrigerant inlet and a refrigerant outlet communicating with the hollow region, and a fin member disposed in the hollow region.

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