Housing and electrical device

Abstract

A power conversion device has a housing. The housing has a housing main body (40) and a lower cover (50). A recess (60) is provided at a main body bottom plate portion (41) of the housing main body (40), the recess (60) is covered by the lower cover (50), thereby forming a bottom plate flow path. The bottom plate flow path has an upstream flow path (32a) and a downstream flow path (32b). The lower cover (50) has a joint plate portion (52, 53), a flow path plate portion (54), and a protrusion (55). The joint plate portion (52, 53) is arranged across the bottom plate flow path (32) in a width direction of the bottom plate flow path (32). The flow path plate portion (54) is provided between the joint plate portion (52, 53) in the width direction of the bottom plate flow path (32). The protrusion (55) is provided between the joint plate portion (52, 53) and the flow path plate portion (54), and extends in a direction intersecting the flow path plate portion (54).

Description

[0001] Citation of relevant applications

[0002] This application is based on Japanese Patent Application No. 2020-192577, filed on November 19, 2020, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The disclosure in this specification relates to a housing and an electrical device. Background Technology

[0004] Patent Document 1 discloses a housing having a flow path for refrigerant flow. This housing also functions as a cooler that internally houses reactors and the like. The housing has a main body with an open upper surface on one of the sides forming the flow path and a cover that covers the opening of the flow path. The cover engages with the main body via a friction-stirring engagement. This engagement extends around the flow path.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-125716 Summary of the Invention

[0008] However, in a housing with flow paths, it is believed that the pressure exerted on the housing by the refrigerant, i.e., the internal pressure, can sometimes increase. When the internal pressure from the refrigerant increases, the stress caused by this internal pressure concentrates in a portion, such as the inner circumferential end of the joint, and may cause plastic deformation of the cover. If plastic deformation of the cover occurs, the refrigerant cannot flow properly in the flow paths.

[0009] The main objective of this disclosure is to provide a housing or electrical device capable of maintaining the flow path for refrigerant flow in an appropriate state.

[0010] The various methods disclosed in this specification employ different technical means to achieve their respective objectives. Furthermore, the symbols enclosed in parentheses in the claims and their respective claims are merely examples of how to indicate the correspondence between a method and the specific elements described in the embodiments described below, and do not limit the scope of the technology.

[0011] To achieve the above objectives, one disclosed method is a shell.

[0012] The fluid flow path of the aforementioned housing is formed in such a way that it extends along its internal space, wherein the aforementioned housing includes:

[0013] The housing body has a main surface with a recess forming a flow path and an internal space; and

[0014] A plate-shaped flow path cover is installed on the main body surface to cover the recess, and together with the recess, forms a flow path.

[0015] The flow path cover has:

[0016] A pair of joining plate portions, the pair of such joining plate portions are joined to the main body surface through the joining portion, and are arranged across the flow path in the width direction of the flow path;

[0017] A flow path plate portion, wherein the flow path plate portion is disposed between a pair of mating plate portions, and is positioned opposite the recess across the flow path while extending in the width direction; and

[0018] The connecting portion is disposed between the joining plate portion and the flow path plate portion, is connected to the flow path plate portion, and extends in a direction intersecting the flow path plate portion.

[0019] According to the aforementioned housing, between the joining plate portion and the flow path plate portion, the connecting portion that connects to the flow path plate portion extends in a direction intersecting the flow path plate portion. In this structure, due to the contact between the connecting portion and the inner surface of the recess or the elastic deformation of the connecting portion, stresses generated by the internal pressure of the flow path or the linear expansion of the flow path cover are unlikely to concentrate in the flow path cover at a portion such as the inner circumferential end of the joining portion. Therefore, it is possible to suppress localized deformation of the flow path cover that could lead to plastic deformation. By suppressing the plastic deformation of the flow path cover in this way, the flow path for refrigerant flow can be maintained in an appropriate state.

[0020] One of the disclosed methods is an electrical device.

[0021] The aforementioned electrical device includes electrical components and a housing that encloses the electrical components within its internal space, and a flow path for fluid flow is formed in such a way that it extends along the electrical components, wherein,

[0022] The housing has:

[0023] The housing body has a main surface with a recess forming a flow path and an internal space; and

[0024] A plate-shaped flow path cover is installed on the main body surface to cover the recess, and together with the recess, forms a flow path.

[0025] The flow path cover has:

[0026] A pair of joining plate portions, the pair of such joining plate portions are joined to the main body surface through the joining portion, and are arranged across the flow path in the width direction of the flow path;

[0027] A flow path plate portion, wherein the flow path plate portion is disposed between a pair of mating plate portions, and is positioned opposite the recess across the flow path while extending in the width direction; and

[0028] The connecting portion is disposed between the joining plate portion and the flow path plate portion, is connected to the flow path plate portion, and extends in a direction intersecting the flow path plate portion.

[0029] The electrical device described above can achieve the same effect as the housing described above. Attached Figure Description

[0030] Figure 1 This is a top view of the power conversion device in the first embodiment.

[0031] Figure 2 yes Figure 1 Sectional view along line II-II.

[0032] Figure 3 This is a bottom view of the power conversion device.

[0033] Figure 4 This is a diagram used to illustrate the joint of an electric power conversion device.

[0034] Figure 5 yes Figure 2 VV-line sectional view.

[0035] Figure 6 yes Figure 3 The VI-VI line sectional view is a longitudinal sectional view of the bottom plate flow path.

[0036] Figure 7 yes Figure 6 Enlarged view of the area around the upstream wall side protrusion.

[0037] Figure 8 This is a longitudinal sectional view of the bottom plate flow path in the second embodiment.

[0038] Figure 9 yes Figure 8 Enlarged view of the periphery of the side ribs of the upstream fin.

[0039] Figure 10 This is a longitudinal sectional view of the bottom plate flow path in the third embodiment.

[0040] Figure 11 This is a longitudinal sectional view of the bottom plate flow path in the fourth embodiment.

[0041] Figure 12 yes Figure 11 Enlarged view of the area around the upstream wall side protrusion.

[0042] Figure 13 This is an enlarged view of the periphery of the upstream wall side protrusion in the fifth embodiment.

[0043] Figure 14 This is a longitudinal sectional view of the bottom plate flow path in the sixth embodiment.

[0044] Figure 15 yes Figure 14 Enlarged view of the periphery of the side ribs of the upstream fin.

[0045] Figure 16 This is an enlarged view of the periphery of the side protrusions of the upstream fin in the seventh embodiment.

[0046] Figure 17 This is a longitudinal sectional view of the bottom plate flow path in the eighth embodiment.

[0047] Figure 18 This is a longitudinal sectional view of the bottom plate flow path in the ninth embodiment.

[0048] Figure 19 This is a longitudinal sectional view of the bottom plate flow path in the tenth embodiment. Detailed Implementation

[0049] Hereinafter, various embodiments for implementing this disclosure will be described with reference to the accompanying drawings. In each embodiment, the same reference numerals are sometimes used to denote parts corresponding to those described in previous embodiments, and repeated descriptions are omitted. Where only a portion of the structure is described in each embodiment, other previously described embodiments can be applied to the remaining parts of the structure. Not only are combinations of combinable parts specifically and explicitly described in each embodiment, but even without explicit description, embodiments can be partially combined as long as they do not hinder combination.

[0050] <First Implementation>

[0051] Figure 1 The power conversion device 10 shown is included in the drive system. The drive system is, for example, installed in vehicles such as electric vehicles (EVs), hybrid electric vehicles (HVs), and fuel cell vehicles. In addition to the power conversion device 10, the drive system also includes an inverter, a battery, and an electric motor. The drive system is a system that drives the electric motor and drives the vehicle's drive wheels.

[0052] A battery is a DC voltage source composed of rechargeable and dischargeable secondary batteries. Examples of secondary batteries are lithium-ion batteries and nickel-metal hydride batteries. The drive system, as a battery, includes a high-voltage battery and a low-voltage battery. The high-voltage battery has a voltage of, for example, 100V, and the low-voltage battery has a voltage of, for example, 12V. The high-voltage battery is sometimes referred to as the first power source, and the low-voltage battery is sometimes referred to as the second power source.

[0053] An electric motor is a three-phase alternating current rotating machine. It has three phases: U, V, and W. The electric motor functions as the driving force for a vehicle. During regeneration, it functions as a generator.

[0054] An inverter device performs power conversion between a high-voltage battery and a motor. The inverter device is capable of bidirectional power conversion. It converts DC power from the high-voltage battery into AC power and supplies it to the motor. Conversely, it converts AC power generated by the motor into DC power and supplies it to the high-voltage battery. The inverter device includes an inverter circuit and capacitors. The inverter circuit is composed of multiple semiconductor switches. The capacitors, for example, are smoothing capacitors that smooth the DC voltage supplied from the high-voltage battery to the inverter circuit.

[0055] The power conversion device 10 is a converter device. The power conversion device 10 and the converter unit 15 described later are sometimes referred to as a DC-DC converter. The power conversion device 10 is capable of bidirectional power conversion. The power conversion device 10 converts DC voltage to different DC voltages. The power conversion device 10 performs power conversion between a high-voltage battery and a low-voltage battery. The power conversion device 10 steps down the DC voltage from the high-voltage battery and supplies it to the low-voltage battery. Furthermore, the power conversion device 10 performs power conversion between an inverter device and a low-voltage battery. The power conversion device 10 steps down the DC voltage from the inverter device and supplies it to the low-voltage battery.

[0056] The power conversion device 10 includes a converter circuit, a capacitor, and a reactor. The converter circuit is composed of multiple semiconductor switches. The capacitor, for example, is a filter capacitor that removes power supply noise from the high-voltage battery. The reactor, for example, boosts the voltage from the high-voltage battery as the semiconductor switches in the converter circuit switch on and off. Furthermore, the power conversion device 10 includes a control device for controlling the converter circuit. The control device is composed of an ECU, etc. ECU is short for Electronic Control Unit. Alternatively, the control device can be included in the inverter device, or a shared control device can be provided for both the power conversion device 10 and the inverter device.

[0057] Next, refer to Figure 1 , Figure 2 The structure of the power conversion device 10 will be described.

[0058] like Figure 1 , Figure 2 As shown, the power conversion device 10 includes a converter unit 15, a capacitor unit 16, a reactor unit 17, and a housing 20. The converter unit 15, capacitor unit 16, and reactor unit 17 correspond to electrical components, and the power conversion device 10 corresponds to an electrical device. The housing 20 is sometimes referred to as the converter housing. Additionally, in... Figure 2 In the diagram, the side view rather than the cross-section is shown for converter unit 15 and reactor unit 17.

[0059] The converter unit 15, capacitor unit 16, and reactor unit 17 are generally rectangular parallelepipeds and housed within the housing 20. The converter unit 15 has a switching element constituting a semiconductor switch of the converter circuit and a switch housing protecting the switching element. The capacitor unit 16 has a capacitor element constituting a filter capacitor and a capacitor housing protecting the capacitor element. The reactor unit 17 has a reactor element constituting a reactor and a reactor housing protecting the reactor element.

[0060] The housing 20 is generally formed into a rectangular cylindrical shape. The housing 20 has an internal space 21, a housing opening 22, a housing base plate 23, and a housing outer wall 24. In the housing 20, the housing opening 22 is located on the side opposite to the housing base plate 23, separated by the internal space 21. The housing outer wall 24 is rectangular cylindrical, forming the housing opening 22.

[0061] In this embodiment, mutually orthogonal directions are referred to as the X direction, Y direction, and Z direction. In the housing 20, the housing opening 22 and the housing base plate 23 are arranged along the Y direction. The housing base plate 23 extends in the X and Z directions, which are orthogonal to the Y direction. Both the housing 20 and the housing base plate 23 are formed to be flat, thinning along the Y direction, where the thickness direction of the housing 20 and the housing base plate 23 is the Y direction.

[0062] The bottom plate portion 23 separates the inside and outside of the housing 20. The upper surface 23a of the bottom plate portion 23 faces the housing opening 22 across the internal space 21 and serves as the bottom plate surface facing the internal space 21. The lower surface 23b of the bottom plate portion 23 faces the side opposite to the housing opening 22 and serves as the lower surface of the housing 20. The upper surface 23a and the lower surface 23b extend in a direction orthogonal to the Y direction. The outer wall 24 of the housing extends along the Y direction and, like the bottom plate portion 23, separates the inside and outside of the housing 20.

[0063] The converter unit 15, capacitor unit 16, and reactor unit 17 are all housed within the internal space 21 of the housing 20. These converter units 15, capacitor units 16, and reactor units 17 are arranged side-by-side laterally along the bottom plate portion 23 of the housing. For example, the reactor unit 17 and converter unit 15 are arranged along the X direction, and the reactor unit 17 and capacitor unit 16 are arranged along the Z direction.

[0064] The power conversion device 10 includes a cooler 30. The cooler 30 cools the internal space 21 of the housing 20, the converter unit 15, the capacitor unit 16, and the reactor unit 17 using a refrigerant. The cooler 30 forms a refrigerant flow path 31 for the refrigerant to flow through, and is equivalent to a flow path forming section. The refrigerant is a liquid such as water or a fluid such as air. The refrigerant exchanges heat with the air in the internal space 21 or with the converter unit 15, capacitor unit 16, and reactor unit 17 via the cooler 30, thereby achieving a cooling effect. The cooler 30 is formed by the housing 20 and components such as piping installed on the housing 20. That is, the cooler 30 is constructed including the housing 20.

[0065] Furthermore, the vehicle equipped with the power conversion device 10 is equipped with a cooling system comprising a cooler 30. The refrigerant system has a circulation path for refrigerant circulation and a pump for circulating the refrigerant within the circulation path. The circulation path includes a refrigerant flow path 31. In the cooling system, the refrigerant flows through the refrigerant flow path 31 by driving the pump.

[0066] The refrigerant flow path 31 includes a bottom plate flow path 32, an inlet path 33, and a outlet path 34. In the refrigerant flow path 31, the inlet path 33, the bottom plate flow path 32, and the outlet path 34 are arranged sequentially from upstream to downstream, and this arrangement direction is referred to as the upstream-downstream direction. In the refrigerant flow path 31, the inlet path 33 and the outlet path 34 can be directly connected to the bottom plate flow path 32, or indirectly connected via connecting paths, etc.

[0067] The bottom plate flow path 32 is formed by the bottom plate portion 23 of the housing. The bottom plate flow path 32 is disposed inside the bottom plate portion 23 and extends along the lower surface 23b of the bottom plate. The upstream and downstream directions of the bottom plate flow path 32 are orthogonal to the Y direction. The width direction of the bottom plate flow path 32 is orthogonal to both the Y direction and the upstream and downstream directions. The width directions of the upstream flow path 32a and the downstream flow path 32b are both in the Z direction. The bottom plate flow path 32 is equivalent to a "flow path for fluid flow".

[0068] The bottom plate flow path 32 bends along the lower surface 23b of the bottom plate. The bottom plate flow path 32 makes a U-shaped turn in a reciprocating manner along the lower surface 23b of the bottom plate, forming an overall U-shape. The bottom plate flow path 32 has an upstream flow path 32a, a downstream flow path 32b, and a bend 32c. In the upstream and downstream directions of the bottom plate flow path 32, the bend 32c is disposed between the upstream flow path 32a and the downstream flow path 32b, and connects these upstream and downstream flow paths 32a and 32b. In the bottom plate flow path 32, refrigerant flows from the upstream flow path 32a through the bend 32c into the downstream flow path 32b.

[0069] Upstream flow path 32a, curved flow path 32c, and downstream flow path 32b are arranged side-by-side along the lower surface 23b of the base plate. Upstream flow path 32a and downstream flow path 32b are arranged along the Z direction. Upstream flow path 32a, downstream flow path 32b, and curved flow path 32c are arranged along the X direction. Curved flow path 32c is located between upstream flow path 32a and downstream flow path 32b in the Y direction. Curved flow path 32c is curved in the X direction, bulging towards the opposite side of upstream flow path 32a and downstream flow path 32b, and is generally curved. In the X direction, the direction of refrigerant flowing through upstream flow path 32a is opposite to the direction of refrigerant flowing through downstream flow path 32b.

[0070] The base plate flow path 32 extends along the converter unit 15, capacitor unit 16, and reactor unit 17. The base plate flow path 32 is positioned in alignment with the converter unit 15 and reactor unit 17 along the Y direction. The reactor unit 17 is positioned across the upstream flow path 32a and the downstream flow path 32b. The converter unit 15 is positioned across the upstream flow path 32a, the downstream flow path 32b, and the bend in the path 32c.

[0071] like Figure 2 , Figure 3 As shown, the housing 20 has a housing body 40 and a lower cover 50. The housing body 40 and the lower cover 50 are formed of a metal material such as aluminum. For example, the housing body 40 and the lower cover 50 are molded bodies formed by die casting of aluminum. The housing body 40 and the lower cover 50 have thermal conductivity.

[0072] The housing body 40 forms the main part of the housing 20 and divides the internal space 21. In this embodiment, the inner surface of the housing body 40 becomes the inner surface of the housing 20 and forms the internal space 21. The housing body 40 has a main body base plate portion 41 and a main body outer wall 45. The main body base plate portion 41 is the portion of the housing body 40 included in the housing base plate portion 23. The upper surface of the main body base plate portion 41 is the upper surface 23a of the bottom plate of the housing 20. If the lower surface of the main body base plate portion 41 is referred to as the lower surface 41a, then the lower surface 41a is the lower surface 23b of the bottom plate of the housing 20. The main body outer wall 45 is the portion of the housing body 40 included in the housing outer wall 24. The lower surface 41a corresponds to the main body surface.

[0073] The housing base plate portion 23 is formed by the main body base plate portion 41 and the lower cover 50. The lower cover 50 is included in the housing base plate portion 23 together with the main body base plate portion 41. The lower cover 50 is generally plate-shaped and is mounted on the main body base plate portion 41. The lower cover 50 overlaps with the lower surface 41a of the main body. The lower cover 50 extends in a direction orthogonal to the Y direction. The direction orthogonal to the Y direction is the direction in which the lower cover 50 extends. The outer periphery of the lower cover 50 moves away from the outer periphery of the lower surface 41a of the main body towards the inner periphery. Therefore, the main body base plate portion 41 and the lower cover 50 together form the lower surface 23b of the housing 20.

[0074] A bottom plate flow path 32 is disposed in the bottom plate portion 23 of the housing between the main body bottom plate portion 41 and the lower cover 50. A recess 60 is provided on the lower surface 41a of the main body of the main body bottom plate portion 41. The opening of the recess 60 is covered by the lower cover 50, thereby forming the bottom plate flow path 32. The recess 60 forms the bottom plate flow path 32 and extends in a groove shape in the upstream and downstream direction of the bottom plate flow path 32. The recess 60 opens toward the side opposite to the upper surface 23a of the bottom plate. The recess 60 is recessed from the lower surface 41a of the main body toward the upper surface 23a of the bottom plate. The depth direction and the height direction of the recess 60 and the bottom plate flow path 32 are both in the Y direction.

[0075] The lower cover 50 covers the opening of the recess 60 from the side opposite to the upper surface 23a of the base plate. In the direction extending from the lower surface 23b of the base plate, the lower cover 50 extends further outward than the recess 60. The lower cover 50 has a portion opposite to the recess 60 and a portion overlapping the lower surface 41a of the main body. The portion of the lower cover 50 that overlaps with the lower surface 41a of the main body engages with the lower surface 41a of the main body. The lower cover 50 functions as a flow path cover. The thickness direction of the lower cover 50 is the Y direction.

[0076] like Figure 3 , Figure 5 , Figure 6 As shown, fins 70 are provided in the bottom plate flow path 32. The fins 70 extend from the inner surface 61 of the recess 60 toward the lower cover 50. The inner surface 61 is the inner surface of the recess 60. The fins 70 extend in the upstream and downstream direction of the bottom plate flow path 32. The fins 70 are part of the main body bottom plate portion 41. Multiple fins 70 are arranged in the width direction of the bottom plate flow path 32. The multiple fins 70 are arranged parallel to each other. Each of the multiple fins 70 extends continuously across the upstream flow path 32a and the downstream flow path 32b via a curved path 32c. By providing fins 70 in the bottom plate flow path 32, the surface area of ​​the inner surface 61 can be expanded.

[0077] The outer surface 71 of fin 70 includes a front fin face 72 and fin sides 73 and 74. The front fin face 72 faces the lower cover 50. The fin sides 73 and 74 are arranged in the width direction of the bottom plate flow path 32 via the front fin face 72. The fin sides 73 and 74 extend in a direction intersecting with the lower cover 50. The fin sides 73 and 74 extend from the concave bottom surface 62 toward the lower cover 50. The fin sides 73 and 74 are connected through the front fin face 72.

[0078] The height dimension of the fin 70 is the same as the depth dimension of the recess 60. The front end face 72 of the fin is arranged along the lower cover 50 on the lower surface 41a of the main body and is located at the same height as the lower surface 41a of the main body.

[0079] The inner surface 61 of the recess 60 includes a bottom surface 62 and wall surfaces 63 and 64. The bottom surface 62, wall surfaces 63 and 64 extend along the upstream and downstream direction of the bottom plate flow path 32 and along the lower cover 50. The bottom surface 62 faces the lower cover 50 across the bottom plate flow path 32. The wall surfaces 63 and 64 face each other across the bottom surface 62. The wall surfaces 63 and 64 are arranged along the width direction of the bottom plate flow path 32. The wall surfaces 63 and 64 extend in a direction intersecting with the lower cover 50. The wall surfaces 63 and 64 extend along the depth direction of the recess 60. The wall surfaces 63 and 64 extend from the bottom surface 62 toward the lower cover 50. The wall surfaces 63 and 64 form the periphery of the bottom plate flow path 32.

[0080] The main body base plate 41 has base plate wall portions 42 and 43. Base plate wall portions 42 and 43 are portions of the main body base plate 41 that form concave wall surfaces 63 and 64. Base plate wall portion 42 is a portion of the main body base plate 41 located along the lower cover 50 and the recess 60. Base plate wall portion 42 forms a concave wall surface 63, and base plate wall portion 43 forms a concave wall surface 64. Base plate wall portions 42 and 43 form the lower surface 41a of the main body.

[0081] The outer surface 71 of the fin, together with the concave bottom surface 62 and the concave wall surfaces 63 and 64, is contained within the concave inner surface 61. The fin 70 extends from the concave bottom surface 62 toward the lower cover 50. The front end surface 72 of the fin is located closer to the lower cover 50 than the concave bottom surface 62.

[0082] The fins 70 are positioned to separate the bottom plate flow path 32 in the width direction. The fin front end faces 72 are arranged side by side on the lower surface 41a of the main body along the lower cover 50 and are located at the same height as the lower surface 41a of the main body. The lower cover 50 overlaps with both the lower surface 41a of the main body and the fin front end faces 72.

[0083] like Figure 4As shown, a joint 37 exists in the bottom plate portion 23 of the housing. The joint 37 is the portion where the main body bottom plate portion 41 joins with the lower cover 50. The lower cover 50 is fixed to the main body bottom plate portion 41 via the joint 37. The joint 37 extends along the periphery of the bottom plate flow path 32. Furthermore, in Figure 4 In the diagram, the joint 37 is illustrated using dotted lines. Additionally, in... Figure 4 The illustration of fin 70 is omitted in the text.

[0084] The joint 37 includes a first joint 37a to a sixth joint 37f. The first joint 37a is disposed between the upstream flow path 32a and the downstream flow path 32b, and extends in the X direction along the inner periphery of the peripheral portion of the bottom plate flow path 32. The second joint 37b to the sixth joint 37f extend along the outer periphery of the peripheral portion of the bottom plate flow path 32. The second joint 37b extends in the Z direction along the upstream end of the upstream flow path 32a. The third joint 37c extends in the X direction along the upstream flow path 32a. The fourth joint 37d is curved such that it extends along the outer periphery of the curved path 32c. The fifth joint 37e extends in the X direction along the downstream flow path 32b. The sixth joint 37f extends in the Z direction along the downstream end of the downstream flow path 32b.

[0085] like Figure 3 , Figure 4 , Figure 6 As shown, the lower cover 50 has joining plate portions 52 and 53, a flow path plate portion 54, and a protrusion 55. These joining plate portions 52 and 53, flow path plate portions 54, and protrusion 55 are arranged along the main body bottom plate portion 41. The joining plate portions 52 and 53 are joined to the lower surface 41a of the main body via a joining portion 37. The joining plate portions 52 and 53 overlap with the lower surface 41a of the main body and extend along the lower surface 41a of the main body. The joining plate portions 52 and 53 extend along the periphery of the bottom plate flow path 32. The inner peripheral ends of the joining plate portions 52 and 53 extend along the inner peripheral ends of the joining portion 37. The joining plate portions 52 and 53 are located at positions separated from each other in the width direction of the bottom plate flow path 32. The joining plate portions 52 and 53 are arranged across the bottom plate flow path 32 in the width direction of the bottom plate flow path 32 and form a pair. In the width direction of the bottom plate flow path 32, the joining plate portion 52 is provided on the side of the concave wall surface 63, and the joining plate portion 53 is provided on the side of the concave wall surface 64.

[0086] A protrusion 55 and a flow path plate portion 54 are disposed between a pair of joining plates 52 and 53. The protrusion 55 and the flow path plate portion 54 are opposite to the recess 60 across the bottom plate flow path 32. The flow path plate portion 54 extends along the width direction of the bottom plate flow path 32 and is opposite to the concave bottom surface 62 of the recess 60. The flow path plate portion 54 is mounted on a plurality of fins 70 in the width direction of the bottom plate flow path 32. The flow path plate portion 54 is disposed side by side on the joining plates 52 and 53 along the main body bottom plate portion 41 and is located at the same height position as the joining plates 52 and 53. The flow path plate portion 54 overlaps with the front end surface 72 of the fin and extends along the front end surface 72 of the fin.

[0087] A protrusion 55 is disposed between at least one of the connecting plate portions 52 and 53 and the flow path plate portion 54. In this embodiment, the protrusion 55 is disposed between the connecting plate portion 52 and the flow path plate portion 54 in the connecting plate portions 52 and 53, and connects these connecting plate portions 52 and the flow path plate portion 54. The protrusion 55 is not disposed between the connecting plate portion 53 and the flow path plate portion 54. The protrusion 55 is connected to the flow path plate portion 54 and extends in a direction intersecting the flow path plate portion 54, corresponding to a connecting portion. The protrusion 55 extends along the periphery of the bottom plate flow path 32 in the upstream and downstream direction.

[0088] like Figure 6 As shown, the protrusion 55 extends toward the recess 60 in the lower cover 50 and is positioned to enter the interior of the recess 60. The protrusion 55 protrudes in a manner that bulges toward the interior of the recess 60 from the joining plate portions 52, 53 and the flow path plate portion 54. The longitudinal section of the protrusion 55 is curved.

[0089] like Figure 7 As shown, the protrusion 55 has an outer protrusion surface 56 and an inner protrusion surface 57. The outer protrusion surface 56 is the outer surface of the protrusion 55 and faces the recess 60. The outer protrusion surface 56 is a curved surface that bulges towards the recess 60. The outer protrusion surface 56 includes a protrusion front end face 56a and protrusion side faces 56b and 56c. The protrusion front end face 56a faces the recess bottom face 62 and extends along the recess bottom face 62. The protrusion side faces 56b and 56c extend in a direction intersecting with the connecting plate portions 52 and 53 and the flow path plate portion 54. The protrusion side face 56b extends from the connecting plate portions 52 and 53 toward the recess bottom face 62. On the other hand, the protrusion side face 56c extends from the flow path plate portion 54 toward the recess bottom face 62. The protrusion side faces 56b and 56c are connected by the protrusion front end face 56a.

[0090] The protrusion 55 is generally wide and flat, so that its width in the Z direction is greater than its height in the Y direction. In the outer surface 56 of the protrusion, the width in the Z direction is greater than the protrusion in the Y direction. For example, the separation distance between the protrusion sides 56b and 56c in the Z direction is greater than the separation distance between the joining plate portions 52 and 53 and the flow path plate portion 54 and the protrusion front end face 56a in the Y direction.

[0091] The inner surface 57 of the protrusion 55 is the inner surface of the protrusion 55 and faces the side opposite to the recess 60. The inner surface 57 of the protrusion 57 is a curved surface that is concave towards the recess 60. The inner surface 57 of the protrusion 57 is open towards the side opposite to the recess 60. The inner surface 57 of the protrusion 57 is in a state of entering the interior of the recess 60. In the Y direction, the recess dimension of the inner surface 57 of the protrusion 57 is greater than the thickness dimension of the joining plate portions 52, 53 and the flow path plate portion 54. The thickness dimension of the joining plate portions 52, 53 and the flow path plate portion 54 is the thickness dimension of the plate forming the lower cover 50. In a direction orthogonal to the upstream and downstream direction of the bottom plate flow path 32, the width dimension of the protrusion 55 is greater than the height dimension of the protrusion 55.

[0092] In this embodiment, as described above, in Figure 3 , Figure 6 In the bottom plate flow path 32, the flow path 32 is bent in a U-shape. One end of the bottom plate flow path 32 in the width direction is the outer peripheral end, and the other end is the inner peripheral end. In the lower cover 50, the outer peripheral joining plate portion 52 of the joining plate portions 52 and 53 is disposed on the outer peripheral side of the flow path plate portion 54. The inner peripheral joining plate portion 53 is disposed on the inner peripheral side of the flow path plate portion 54. A protrusion 55 is provided between the flow path plate portion 54 and the outer peripheral joining plate portion 52, connecting these flow path plate portions 54 and the outer peripheral joining plate portion 52. On the other hand, the protrusion 55 is not provided between the flow path plate portion 54 and the inner peripheral joining plate portion 53. These flow path plate portions 54 and the inner peripheral joining plate portion 53 are directly connected without being connected via the protrusion 55.

[0093] like Figure 3 , Figure 6 , Figure 7 As shown, in the protrusion 55, the outer peripheral protrusion side 56b of the protrusion sides 56b and 56c is disposed on the outer peripheral side of the protrusion front end face 56a. The inner peripheral protrusion side 56c is disposed on the inner peripheral side of the protrusion front end face 56a. In the recess 60, the outer peripheral recessed wall surface 63 of the recessed wall surfaces 63 and 64 is disposed on the outer peripheral side of the recessed bottom surface 62. The inner peripheral recessed wall surface 64 is disposed on the inner peripheral side of the recessed bottom surface 62. In the main body base plate portion 41, the outer peripheral base plate wall portion 42 of the base plate wall portions 42 and 43 is disposed on the outer peripheral side of the base plate flow path 32. The inner peripheral base plate wall portion 43 is disposed on the inner peripheral side of the base plate flow path 32. In the fin 70, the outer peripheral fin side surface 73 of the fin sides 73 and 74 is disposed on the outer peripheral side of the fin front end face 72. The inner peripheral fin side surface 74 is disposed on the inner peripheral side of the fin front end face 72.

[0094] like Figure 6 , Figure 7 As shown, in the width direction of the bottom plate flow path 32, the outer peripheral concave wall surface 63 of the recess 60 and the outer peripheral protruding side surface 56b of the protrusion 55 face each other. Additionally, the outer peripheral fin side surface 73 of the fin 70 and the inner peripheral protruding side surface 56c of the protrusion 55 face each other. In the depth direction of the recess 60, the outer peripheral concave wall surface 63 extends toward the outer peripheral joining plate portion 52, and the inner peripheral concave wall surface 64 extends toward the inner peripheral joining plate portion 53. The outer peripheral concave wall surface 63 and the inner peripheral concave wall surface 64 extend in a direction intersecting with the flow path plate portion 54. The outer peripheral concave wall surface 63 corresponds to both the intersecting surface and the peripheral wall surface.

[0095] The protrusion 55 is positioned in the width direction of the bottom plate flow path 32, contacting the outer peripheral concave wall surface 63 of the recess 60. The protrusion 55 is disposed between the outermost fin 70 and the outer peripheral bottom plate wall 42 among a plurality of fins 70. The outer peripheral protrusion side 56b of the protrusion 55 and the outer peripheral concave wall surface 63 are opposite to and in contact with each other. The inner peripheral protrusion side 56c of the protrusion 55 and the outer peripheral fin side 73 of the fin 70 adjacent to the protrusion 55 are opposite to each other and separated from each other in the width direction of the bottom plate flow path 32.

[0096] The protrusion 55 contacts the outer peripheral concave wall surface 63. Even assuming the protrusion 55 does not contact the outer peripheral concave wall surface 63, the protrusion 55 is positioned close to the outer peripheral concave wall surface 63 so that it contacts the outer peripheral concave wall surface 63 as the refrigerant expands linearly. In cases where heat is generated in electrical components such as the converter unit 15 or reactor unit 17, linear expansion of the refrigerant is sometimes caused by applying this heat to the refrigerant. During the linear expansion of the refrigerant, the refrigerant pushes the protrusion 55 toward the outer peripheral concave wall surface 63, thereby causing the lower cover 50 to elastically deform and bringing the protrusion 55 into contact with the outer peripheral concave wall surface 63.

[0097] As for the position where the protrusion 55 contacts the outer peripheral concave wall surface 63, there are contact positions where the protrusion 55 maintains contact with the outer peripheral concave wall surface 63 and contactable positions where the protrusion 55 can separate from the outer peripheral concave wall surface 63 within a range that allows it to contact the outer peripheral concave wall surface 63. In the structure where the protrusion 55 is positioned at the contactable position, as the lower cover 50 elastically deforms, the closer the protrusion 55 is to the outer peripheral concave wall surface 63, the smaller the separation distance between the protrusion 55 and the outer peripheral concave wall surface 63. In this embodiment, the protrusion 55 is provided at one of the contact positions and the contactable positions.

[0098] The protrusion 55 has front end bends 58a and 58b and base end bends 58c and 58d. The front end bends 58a and 58b are arranged along the width direction of the protrusion 55. In the protrusion 55, the front end bend 58a on the outer peripheral side connects the front end face 56a of the protrusion to the outer peripheral side face 56b. The front end bend 58b on the inner peripheral side connects the front end face 56a of the protrusion to the inner peripheral side face 56c. Both the front end bends 58a and 58b are bent in a manner that bulges towards the concave bottom surface 62.

[0099] The base-end bends 58c and 58d are arranged along the width direction of the protrusion 55. In the protrusion 55, the base-end bend 58c on the outer peripheral side connects the outer peripheral protrusion side 56b to the outer peripheral joining plate portion 52. The base-end bend 58d on the inner peripheral side connects the inner peripheral protrusion side 56c to the flow path plate portion 54. Both the base-end bends 58c and 58d are bent in a manner that bulges towards the side opposite to the concave bottom surface 62.

[0100] In the housing 20, the internal pressure applied to the recess 60 or the lower cover 50 by the refrigerant flowing through the bottom plate flow path 32 may sometimes increase. An example of this increased internal pressure in the bottom plate flow path 32 is the occurrence of pulsations in the refrigerant flow due to the driving of the pump used to flow the refrigerant. Another example is the linear expansion of the refrigerant caused by heat generated in the converter unit 15 or the reactor unit 17.

[0101] Unlike this embodiment, for example, it is assumed that the lower cover 50 does not have a protrusion 55 between the pair of connecting plates 52, 53. In this structure, the outer peripheral connecting plate 52 and the flow path plate 54 are directly connected without the protrusion 55, and the stress caused by the increased internal pressure of the bottom plate flow path 32 may concentrate in a part of the lower cover 50, such as at the inner peripheral end of the connecting portion 37. When the stress is concentrated in a part of the lower cover 50, it is assumed that the lower cover 50 will locally deform and undergo plastic deformation.

[0102] Furthermore, in the structure where the protrusion 55 is not provided in the lower cover 50, the boundary between the outer peripheral joint plate portion 52 and the flow path plate portion 54 is located near the inner peripheral end of the joint portion 37. Therefore, it is believed that the plastic deformation generated near the inner peripheral end of the joint portion 37 in the lower cover 50 is easily generated in such a way that the flow path plate portion 54 moves relative to the outer peripheral joint plate portion 52 toward the side opposite to the recess 60.

[0103] In contrast, in this embodiment, as described above, the protrusion 55 is positioned to contact the outer peripheral concave wall surface 63. In this structure, the stress generated by the increased internal pressure of the bottom plate flow path 32 acts to press the protrusion 55 against the outer peripheral concave wall surface 63, and is applied to the outer peripheral concave wall surface 63 via the protrusion 55. Thus, by applying stress from the lower cover 50 to the outer peripheral concave wall surface 63, it is difficult for stress concentration to occur in the lower cover 50 at a portion such as the inner peripheral end of the joint 37. Therefore, it is possible to suppress the localized deformation of the lower cover 50 due to stress concentration in a portion of the lower cover 50, thus preventing plastic deformation.

[0104] In this embodiment, protrusions 55 are provided for both the upstream flow path 32a and the downstream flow path 32b. The protrusion 55 for the upstream flow path 32a is also referred to as the upstream wall-side protrusion 551, and the protrusion 55 for the downstream flow path 32b is also referred to as the downstream wall-side protrusion 552. Regarding the outer peripheral joining plate portion 52, the portion for the upstream flow path 32a is also referred to as the upstream joining plate portion 521, and the portion for the downstream flow path 32b is also referred to as the downstream joining plate portion 522. Regarding the flow path plate portion 54, the portion for the upstream flow path 32a is also referred to as the upstream flow path plate portion 541, and the portion for the downstream flow path 32b is also referred to as the downstream flow path plate portion 542.

[0105] Regarding the recess 60, the portion forming the upstream flow path 32a is also called the upstream recess 601, and the portion forming the downstream flow path 32b is also called the downstream recess 602. Regarding the outer peripheral recessed wall surface 63, the portion forming the upstream flow path 32a is also called the upstream recessed wall surface 631, and the portion forming the downstream flow path 32b is also called the downstream recessed wall surface 632. Regarding the fin 70, the portion disposed in the upstream flow path 32a is also called the upstream fin 701, and the portion disposed in the downstream flow path 32b is also called the downstream fin 702. Regarding the outer peripheral bottom plate wall portion 42 of the main body bottom plate portion 41, the portion forming the upstream flow path 32a is also called the upstream bottom plate wall portion 421, and the portion forming the downstream flow path 32b is also called the downstream bottom plate wall portion 422.

[0106] The inner circumferential bottom plate wall 43 of the main body bottom plate portion 41 is disposed between the upstream recess 601 and the downstream recess 602. This inner circumferential bottom plate wall 43 separates the upstream flow path 32a and the downstream flow path 32b, and acts as a separator. The lower cover 50 is disposed across the inner circumferential bottom plate wall 43, spanning the upstream flow path 32a and the downstream flow path 32b. In other words, the lower cover 50 spans the inner circumferential bottom plate wall 43, the upstream recess 601, and the downstream recess 602, and is disposed between the upstream bottom plate wall 421 and the downstream bottom plate wall 422. In the lower cover 50, an inner circumferential connecting plate portion 53 is disposed between the upstream flow path plate portion 541 and the downstream flow path plate portion 542. This inner circumferential connecting plate portion 53 connects the upstream flow path plate portion 541 and the downstream flow path plate portion 542.

[0107] An upstream wall-side protrusion 551 is disposed at a position contacting the outer peripheral concave wall surface 63 of the upstream recess 601. The upstream wall-side protrusion 551 is disposed between the upstream joining plate portion 521 and the upstream flow path plate portion 541 in the width direction of the upstream flow path 32a, and connects these upstream joining plate portions 521 and the upstream flow path plate portion 541. A downstream wall-side protrusion 552 is disposed at a position contacting the outer peripheral concave wall surface 63 of the downstream recess 602. The downstream wall-side protrusion 552 is disposed between the downstream joining plate portion 522 and the downstream flow path plate portion 542 in the width direction of the downstream flow path 32b, and connects these downstream joining plate portions 522 and the downstream flow path plate portion 542.

[0108] Furthermore, upstream flow path 32a corresponds to the first flow path, and downstream flow path 32b corresponds to the second flow path. The Z direction corresponds to the arrangement direction of the first and second flow paths. Upstream joining plate portion 521 corresponds to the joining plate portion and the first joining plate portion, and downstream joining plate portion 522 corresponds to the joining plate portion and the second joining plate portion. Inner peripheral joining plate portion 53 corresponds to the joining plate portion and the separating joining plate portion. Upstream flow path plate portion 541 corresponds to the flow path plate portion and the first flow path plate portion, and downstream flow path plate portion 542 corresponds to the flow path plate portion and the second flow path plate portion. Upstream wall side protrusion 551 corresponds to the connecting portion, contact connecting portion, wall side connecting portion, and first connecting portion, and downstream wall side protrusion 552 corresponds to the connecting portion, contact connecting portion, wall side connecting portion, and second connecting portion. Upstream concave wall surface 631 corresponds to the intersecting surface and the first peripheral wall surface, and downstream concave wall surface 632 corresponds to the intersecting surface and the second peripheral wall surface.

[0109] Next, the manufacturing method of the housing 20 will be described as a method for manufacturing the power conversion device 10. The process of manufacturing the power conversion device 10 includes the process of manufacturing the housing 20 and the process of housing electrical components such as the converter unit 15 inside the housing 20.

[0110] In the manufacturing process of the housing 20, after the operator manufactures the housing body 40 and the lower cover 50 respectively, a temporary installation process is performed to temporarily install the lower cover 50 onto the housing body 40. In this temporary installation process, Figure 3 , Figure 6 In this configuration, the lower cover 50 is temporarily installed on the main body bottom plate portion 41 of the housing body 40, such that the upstream wall-side protrusion 551 enters the interior of the upstream recess 601, and the downstream wall-side protrusion 552 enters the interior of the downstream recess 602. In this configuration, the upstream wall-side protrusion 551 and the downstream wall-side protrusion 552 are fitted between the upstream recessed wall surface 631 and the downstream recessed wall surface 632. Therefore, by bringing the wall-side protrusions 551 and 552 into contact with the outer peripheral recessed wall surface 63, it is possible to suppress the positional displacement of the lower cover 50 relative to the housing body 40 in the Z direction.

[0111] After the temporary installation process, a joining process is performed. In this joining process, the housing body 40 and the lower cover 50 are fixed by friction stirring joining. Friction stirring joining is a method in which a high-speed rotating tool is pressed against the lower cover 50, and the lower cover 50 is joined to the base plate portion 41 of the main body by the frictional heat between the tool and the lower cover 50. During the manufacture of the housing 20, the joining portions 37 are formed in the order of first joining portion 37a to sixth joining portion 37f by continuously performing friction stirring joining along the periphery of the recess 60. Figure 4 As shown by the double-dotted line, the joint 37 is formed in a single stroke, starting from the beginning point 38A closest to the bend 32c in the first joint 37a and ending at the end point 38B closest to the upstream flow path 32a in the sixth joint 37f. Friction-stirring joint is sometimes referred to as FSW.

[0112] During the joining process, the main body base plate 41 and lower cover 50 of the housing body 40 may sometimes expand linearly due to the heat generated by frictional stirring. Unlike this embodiment, in a structure where the protrusion 55 is not provided in the lower cover 50, if linear expansion of the main body base plate 41 or the lower cover 50 occurs, the stress caused by this linear expansion may concentrate in the lower cover 50 at a portion such as the inner peripheral end of the joining portion 37. In this case, similar to the completed power conversion device 10, it is assumed that the stress will concentrate in a portion of the lower cover 50, causing local deformation of the lower cover 50 and resulting in plastic deformation.

[0113] In contrast, during the joining process, the wall-side protrusions 551 and 552 come into contact with the outer peripheral concave wall surface 63. Therefore, similar to the completed power conversion device 10, the stress generated by the linear expansion of the lower cover 50, etc., is applied from the wall-side protrusions 551 and 552 to the outer peripheral concave wall surface 63, thereby suppressing the plastic deformation of the lower cover 50.

[0114] Alternatively, the method of joining the housing body 40 and the lower cover 50 may not be friction stirring. For example, the housing body 40 and the lower cover 50 may also be joined by welding or adhesive materials.

[0115] According to the embodiment described above, the wall-side protrusions 551 and 552 extending in a direction intersecting the flow path plate portion 54 and the outer peripheral concave wall surface 63 extending in a direction intersecting the flow path plate portion 54 are in contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the bottom plate flow path 32 or linear expansion of the lower cover 50, this stress will be applied to the outer peripheral concave wall surface 63 from the wall-side protrusions 551 and 552. Therefore, it is possible to suppress the local deformation of the lower cover 50 due to stress concentration in a part of the lower cover 50. As a result, the bottom plate flow path 32 formed by the lower cover 50 can be maintained in an appropriate state.

[0116] According to this embodiment, the side protrusions 551 and 552 contact the outer peripheral concave wall surface 63. Therefore, even if stress is generated due to an increase in internal pressure in the bottom plate flow path 32, stress can be applied to the outer peripheral concave wall surface 63 from the side protrusions 551 and 552 without waiting for the elastic deformation of the lower cover 50 caused by the stress. Therefore, stress can be applied to the outer peripheral concave wall surface 63 from the lower cover 50 more reliably.

[0117] According to this embodiment, the outer peripheral concave wall surface 63, which contacts the wall-side protrusions 551 and 552, forms the periphery of the bottom plate flow path 32. In this structure, the stress applied to the outer peripheral concave wall surface 63 by the wall-side protrusions 551 and 552 is applied to the outer peripheral bottom plate wall portion 42 forming the outer peripheral concave wall surface 63. For example, compared to the fin 70, the outer peripheral bottom plate wall portion 42 has higher strength due to its larger volume or the formation of the lower surface 41a of the main body. Therefore, even if stress is applied to the outer peripheral concave wall surface 63 by the wall-side protrusions 551 and 552, it is difficult for the outer peripheral bottom plate wall portion 42 to deform due to the stress. Therefore, the bottom plate flow path 32 formed by the outer peripheral bottom plate wall portion 42 can be maintained in an appropriate state.

[0118] According to this embodiment, since the wall-side protrusions 551 and 552 are bent, the wall-side protrusions 551 and 552 are easily elastically deformed as a whole. Therefore, in cases where it is impossible to apply all the stress from the wall-side protrusions 551 and 552 to the peripheral concave wall surface 63, by causing the wall-side protrusions 551 and 552 to elastically deform as a whole, it is possible to suppress the concentration of residual stress on a portion of the wall-side protrusions 551 and 552.

[0119] According to this embodiment, since the outer peripheral protrusion side 56b of the wall-side protrusions 551 and 552 contacts the outer peripheral concave wall surface 63, the contact area between the wall-side protrusions 551 and 552 and the outer peripheral concave wall surface 63 is easily increased. Therefore, it is difficult for stress concentration to occur in a single area of ​​the contact portion between the wall-side protrusions 551 and 552 and the outer peripheral concave wall surface 63. Therefore, it is possible to suppress localized deformation of the wall-side protrusions 551 and 552 in contact with the outer peripheral concave wall surface 63, thus preventing plastic deformation of the wall-side protrusions 551 and 552.

[0120] According to this embodiment, in the upstream flow path 32a, the upstream wall-side protrusion 551 contacts the upstream concave wall surface 631, and in the downstream flow path 32b, the downstream wall-side protrusion 552 contacts the downstream concave wall surface 632. Therefore, stress caused by an increase in internal pressure in the bottom plate flow path 32 or linear expansion of the lower cover 50 is applied from the upstream wall-side protrusion 551 to the upstream concave wall surface 631, and from the downstream wall-side protrusion 552 to the downstream concave wall surface 632. Therefore, in either the upstream flow path 32a or the downstream flow path 32b, stress concentration on a portion of the lower cover 50, preventing localized deformation and plastic deformation of the lower cover 50, can be suppressed. Thus, either the upstream flow path 32a or the downstream flow path 32b formed by the lower cover 50 can be maintained in an appropriate state.

[0121] In this embodiment, the lower cover 50 is mounted on the upstream flow path 32a and the downstream flow path 32b via the inner peripheral bottom plate wall portion 43. In this lower cover 50, it is believed that stress generated by the increase in internal pressure of the bottom plate flow path 32 or the linear expansion of the lower cover 50 is easily transmitted from the central side to the outer periphery. Therefore, in the lower cover 50, stress concentration is more likely to occur in a portion such as the inner peripheral end of the joint portion 37 compared to the inner peripheral joint plate portion 53.

[0122] In contrast, according to this embodiment, the wall-side protrusions 551 and 552 are connected to the outer peripheral joint plate portion 52. In this way, the wall-side protrusions 551 and 552 are effective in suppressing the plastic deformation of the lower cover 50, especially in the outer peripheral joint plate portion 52 where stress tends to concentrate in the inner peripheral end of the joint portion 37.

[0123] <Second Implementation>

[0124] In the first embodiment described above, the protrusion 55 is positioned to contact the outer peripheral concave wall surface 63 of the recess 60. In contrast, in the second embodiment, the protrusion 55 is positioned to contact the inner peripheral fin side surface 74 of the fin 70. The structures, functions, and effects in the second embodiment, unless otherwise specified, are the same as in the first embodiment. The second embodiment will be described focusing on the differences from the first embodiment described above.

[0125] In this embodiment, such as Figure 8 , Figure 9As shown, the protrusion 55 is positioned at a location that is separated from the recessed wall surfaces 63 and 64 of the recess 60 in the width direction of the bottom plate flow path 32. Unlike the first embodiment described above, the lower cover 50 has a plurality of flow path plates 54. The flow path plates 54 are disposed between the protrusion 55 and the outer peripheral joining plate 52, and also between the protrusion 55 and the inner peripheral joining plate 53. The lower cover 50 is disposed between the flow path plates 54 located on the outer peripheral joining plate 52 side and the flow path plates 54 located on the inner peripheral joining plate 53 side, and connects these flow path plates 54. The flow path plates 54 located on the outer peripheral joining plate 52 side connect the outer peripheral joining plate 52 to the protrusion 55. The flow path plates 54 located on the inner peripheral joining plate 53 side connect the inner peripheral joining plate 53 to the protrusion 55.

[0126] A protrusion 55 is provided between two adjacent flow path plates 54 in the width direction of the bottom plate flow path 32, and connects these flow path plates 54. The protrusion 55 is connected to the two flow path plates 54 and extends in a direction that intersects with both of these flow path plates 54. In this embodiment, the protrusion 55 is not directly connected to either of the connecting plates 52, 53.

[0127] The protrusion 55 is positioned in the width direction of the bottom plate flow path 32, contacting the inner peripheral fin side surface 74 of the fin 70. The protrusion 55 is disposed between the innermost fin 70 and the inner peripheral bottom plate wall 43 among the plurality of fins 70. The outer peripheral protrusion side surface 56b of the protrusion 55 and the inner peripheral fin side surface 74 are in contact with each other in a mutually opposing state. The inner peripheral protrusion side surface 56c of the protrusion 55 and the inner peripheral concave wall surface 64 are separated in the width direction of the bottom plate flow path 32 in a mutually opposing state. Furthermore, the inner peripheral fin side surface 74 corresponds to both the intersecting surface and the fin side surface.

[0128] In this embodiment, since the protrusion 55 is positioned to contact the inner peripheral fin side surface 74, the stress caused by the increased internal pressure of the bottom plate flow path 32 acts by pressing against the inner peripheral fin side surface 74 via the protrusion 55, thereby applying stress to the inner peripheral fin side surface 74 via the protrusion 55. Thus, by applying stress to the inner peripheral fin side surface 74 from the lower cover 50, it is difficult for stress concentration to occur in the lower cover 50 at a portion such as the inner peripheral end of the joint 37. Therefore, similar to the first embodiment described above, it is possible to suppress stress concentration in a portion of the lower cover 50, preventing localized deformation of the lower cover 50 and subsequent plastic deformation.

[0129] In this embodiment, similar to the first embodiment described above, protrusions 55 are provided for the upstream flow path 32a and the downstream flow path 32b respectively. The protrusion 55 provided for the upstream flow path 32a is also called the upstream fin side protrusion 553, and the protrusion 55 provided for the downstream flow path 32b is also called the downstream fin side protrusion 554.

[0130] An upstream fin side protrusion 553 is disposed at a position contacting the inner circumferential fin side surface 74 of the upstream fin 701. The upstream fin side protrusion 553 is disposed between two adjacent upstream flow path plates 541 in the width direction of the upstream flow path 32a, and connects these upstream flow path plates 541. A downstream fin side protrusion 554 is disposed at a position contacting the inner circumferential fin side surface 74 of the downstream fin 702. The downstream fin side protrusion 554 is disposed between two adjacent downstream flow path plates 542 in the width direction of the downstream flow path 32b, and connects these downstream flow path plates 542. The fin side protrusions 553 and 554 correspond to a connecting portion, a contact connecting portion, and a fin side connecting portion, respectively.

[0131] Next, the manufacturing method of the housing 20 will be described. When the lower cover 50 is temporarily installed on the housing body 40 during the temporary installation process, the upstream fin side protrusion 553 and the downstream fin side protrusion 554 are fitted between the upstream fin 701 and the downstream fin 702. In this case, by contacting the fin side protrusions 553 and 554 with the inner peripheral fin side surface 74, the positional displacement of the lower cover 50 relative to the housing body 40 in the Z direction can be suppressed.

[0132] When the joining operation is performed after the temporary installation process, the fin side protrusions 553 and 554 are in contact with the inner peripheral fin side surface 74. Therefore, similar to the completed power conversion device 10, the stress generated by the linear expansion of the lower cover 50, etc., is applied from the fin side protrusions 553 and 554 to the inner peripheral fin side surface 74, thereby suppressing the plastic deformation of the lower cover 50.

[0133] According to this embodiment, the fin side protrusions 553 and 554 extending in the direction intersecting the flow path plate portion 54 and the inner peripheral fin side surface 74 extending in the direction intersecting the flow path plate portion 54 are in contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the bottom plate flow path 32 or linear expansion of the lower cover 50, this stress will be applied to the inner peripheral fin side surface 74 from the fin side protrusions 553 and 554. Therefore, plastic deformation of the lower cover 50 can be suppressed by the fin side protrusions 553 and 554.

[0134] According to this embodiment, the fin side protrusions 553 and 554 contact the inner peripheral fin side surface 74. Therefore, even if stress is generated due to an increase in internal pressure in the bottom plate flow path 32, stress can be applied to the inner peripheral fin side surface 74 from the fin side protrusions 553 and 554 without waiting for the elastic deformation of the lower cover 50 caused by the stress. Therefore, stress can be applied to the inner peripheral fin side surface 74 from the lower cover 50 more reliably.

[0135] According to this embodiment, the inner peripheral fin side surface 74 is contained within the outer fin surface 71 of the fin 70. In this structure, the stress applied to the inner peripheral fin side surface 74 from the fin side protrusions 553, 554 is applied to the fin 70. Therefore, the fin 70 can achieve both increasing the contact area between the inner recess 61 of the recess 60 and the refrigerant in the bottom plate flow path 32, thereby improving the cooling effect of the refrigerant, and suppressing local deformation of the lower cover 50.

[0136] According to this embodiment, since the fin side protrusions 553 and 554 are bent, the fin side protrusions 553 as a whole are easily elastically deformed. Therefore, in cases where it is impossible to apply all the stress to the inner circumferential fin side surface 74 from the fin side protrusions 553 and 554, by elastically deforming the fin side protrusions 553 and 554 as a whole, it is possible to suppress the concentration of residual stress on a portion of the fin side protrusions 553 and 554.

[0137] According to this embodiment, since the outer peripheral rib side surface 56b of the fin side ribs 553 and 554 contacts the inner peripheral fin side surface 74 of the fin 70, the contact area between the fin side ribs 553 and 554 and the fin 70 is easily increased. Therefore, it is difficult for stress to concentrate in a single area at the contact portion between the fin side ribs 553 and 554 and the inner peripheral fin side surface 74. Therefore, it is possible to suppress localized deformation of the fin side ribs 553 and 554 in contact with the fin 70, thus preventing plastic deformation of the fin side ribs 553 and 554.

[0138] <Third Implementation Method>

[0139] In the first embodiment described above, the protrusion 55 is positioned at the contact point with the outer peripheral concave wall surface 63. In the second embodiment described above, the protrusion 55 is positioned at the contact point with the inner peripheral fin side surface 74. In contrast, in the third embodiment, the protrusion 55 is positioned at both the contact point with the outer peripheral concave wall surface 63 and the contact point with the inner peripheral fin side surface 74. The structures, functions, and effects in the third embodiment that are not specifically described are the same as those in the first and second embodiments. The third embodiment will be described focusing on the differences from the first and second embodiments described above.

[0140] like Figure 10 As shown, multiple protrusions 55 are provided for both the upstream flow path 32a and the downstream flow path 32b. In the upstream flow path 32a, the multiple protrusions 55 are arranged along the width direction of the upstream flow path 32a, and fins 70 are provided between adjacent protrusions 55. In the downstream flow path 32b, the multiple protrusions 55 are arranged along the width direction of the downstream flow path 32b, and fins 70 are provided between adjacent protrusions 55. The multiple protrusions 55 include the wall-side protrusions 551 and 552 of the first embodiment and the fin-side protrusions 553 and 554 of the second embodiment.

[0141] In the upstream flow path 32a, a plurality of upstream fin side protrusions 553 are provided. These protrusions 553 are arranged along the width direction of the upstream flow path 32a and are respectively positioned to contact different upstream fins 701. For example, one of two adjacent upstream fin side protrusions 553 is positioned between the inner circumferential bottom plate wall portion 43 and the adjacent upstream fin 701, and contacts the inner circumferential fin side surface 74 of the upstream fin 701. The other of two adjacent upstream fin side protrusions 553 is positioned between two adjacent upstream fins 701 and contacts the inner circumferential fin side surface 74 of the upstream fin 701 located on the opposite side of the inner circumferential bottom plate wall portion 43.

[0142] In the downstream flow path 32b, a plurality of downstream fin side protrusions 554 are provided. These protrusions 554 are arranged along the width direction of the downstream flow path 32b and are respectively positioned to contact different downstream fins 702. For example, one of two adjacent downstream fin side protrusions 554 is positioned between the inner circumferential base plate wall portion 43 and the downstream fin 702 adjacent to it, and contacts the inner circumferential fin side surface 74 of that downstream fin 702. The other of two adjacent downstream fin side protrusions 554 is positioned between two adjacent downstream fins 702 and contacts the inner circumferential fin side surface 74 of the downstream fin 702 located on the opposite side of the inner circumferential base plate wall portion 43.

[0143] <Fourth Implementation>

[0144] In the fourth embodiment, the outer peripheral concave wall surface 63 of the recess 60 has an inclined surface 68. The structures, functions, and effects not specifically described in the fourth embodiment are the same as those in the first to third embodiments. The fourth embodiment will be described focusing on the differences from the third embodiment described above.

[0145] like Figure 11 , Figure 12As shown, the outer peripheral concave wall surface 63 of the recess 60 has a raised surface 67 and an inclined surface 68. The raised surface 67 forms an end face on the side of the concave bottom surface 62 in the outer peripheral concave wall surface 63. The raised surface 67 extends in the depth direction of the recess 60 in a direction intersecting with the lower cover 50. The inclined surface 68 is disposed on the side opposite to the concave bottom surface 62 in the depth direction of the recess 60, separated by the raised surface 67, and forms an end face on the side of the lower surface 41a of the main body in the outer peripheral concave wall surface 63. The inclined surface 68 extends in a direction inclined relative to both the raised surface 67 and the lower surface 41a of the main body, and connects the raised surface 67 to the lower surface 41a of the main body. The inclination of the inclined surface 68 relative to the depth direction of the recess 60 is greater than the inclination of the raised surface 67 relative to the depth direction of the recess 60. The longitudinal section of the recess 60 is such that the protruding corners of the outer peripheral concave wall surface 63 and the lower surface 41a of the main body are chamfered by the inclined surface 68.

[0146] In each of the upstream flow path 32a and the downstream flow path 32b, a plurality of protrusions 55 include protrusions 55 disposed at positions that contact the inclined surface 68 of the outer peripheral concave wall surface 63. For example, the upstream wall-side protrusion 551 and the downstream wall-side protrusion 552 are respectively disposed at positions that contact the inclined surface 68 of the outer peripheral concave wall surface 63.

[0147] Side protrusions 551 and 552 are positioned closer to the inclined surface 68 than the raised surface 67 in the depth direction of the recess 60. The side protrusions 551 and 552 and the raised surface 67 are arranged along the depth direction of the recess 60. The side protrusions 551 and 552 are arranged side-by-side on the inclined surface 68 in the width direction of the bottom plate flow path 32. At least a portion of the outer surface 56 of the side protrusions 551 and 552 contacts the inclined surface 68. The outer peripheral curved portion 58a of the side protrusions 551 and 552 is located closest to the inclined surface 68 and is most likely to contact it.

[0148] The inclined surface 68 is inclined in such a way that it extends along the front bend 58a of the outer peripheral side. Therefore, if the front bend 58a of the outer peripheral side contacts the inclined surface 68, the contact area between the wall-side protrusions 551, 552 and the outer peripheral concave wall surface 63 tends to increase. Therefore, by making the front bend 58a of the outer peripheral side contact the inclined surface 68, stress concentration in a single part of the contact area between the wall-side protrusions 551, 552 and the outer peripheral concave wall surface 63 can be suppressed. The inclined surface 68 is inclined relative to the outer peripheral protrusion side surface 56b and the inner peripheral protrusion side surface 56c of the wall-side protrusions 551, 552.

[0149] According to this embodiment, in the outer peripheral concave wall surface 63, the inclined surface 68 that contacts the wall side protrusions 551 and 552 is inclined relative to the depth direction of the recess 60. Therefore, even if the relative positions of the wall side protrusions 551 and 552 relative to the outer peripheral concave wall surface 63 are slightly offset in the width direction of the bottom plate flow path 32 due to manufacturing errors, the wall side protrusions 551 and 552 can easily contact the inclined surface 68 of the outer peripheral concave wall surface 63.

[0150] In the event that the lower cover 50 elastically deforms due to increased internal pressure in the bottom plate flow path 32, it is assumed that the wall-side protrusions 551 and 552 will tilt so that the opening of the inner surface 57 of the protrusion faces the outer peripheral concave wall surface 63. In this case, since the tilt angle of the outer peripheral protrusion side 56b is close to the tilt angle of the tilt surface 68, the outer peripheral protrusion side 56b of the wall-side protrusions 551 and 552 is more likely to come into contact with the tilt surface 68. For the lower cover 50, even if either the front end bend 58a of the outer periphery or the outer peripheral protrusion side 56b comes into contact with the tilt surface 68, the contact area between the wall-side protrusions 551 and 552 and the outer peripheral concave wall surface 63 is likely to increase. Therefore, even assuming that the lower cover 50 deforms, the tilt surface 68 can suppress the concentration of stress in a portion of the contact area between the wall-side protrusions 551 and 552 and the outer peripheral concave wall surface 63.

[0151] <Fifth Implementation>

[0152] In the fourth embodiment described above, the outer peripheral protruding side 56b of the protrusion 55 is inclined relative to the inclined surface 68 of the recess 60. In contrast, in the fifth embodiment, the outer peripheral protruding side 56b extends along the inclined surface 68. The structures, functions, and effects not specifically described in the fifth embodiment are the same as in the first to fourth embodiments. The fifth embodiment will be described focusing on the differences from the fourth embodiment described above.

[0153] like Figure 13 As shown, the longitudinal sections of the wall-side protrusions 551 and 552 are not curved, but are generally straight. Unlike the fourth embodiment described above, the wall-side protrusions 551 and 552 do not have curved portions 58a to 58d. In the wall-side protrusions 551 and 552, the front end face 56a and the outer peripheral protrusion side face 56b are directly connected without passing through the front end curved portion 58a on the outer peripheral side. The outer peripheral protrusion side face 56b and the outer peripheral joining plate portion 52 are directly connected without passing through the base end curved portion 58c on the outer peripheral side. The front end face 56a and the inner peripheral protrusion side face 56c are directly connected without passing through the front end curved portion 58b on the inner peripheral side. The inner peripheral protrusion side face 56c and the flow path plate portion 54 are directly connected without passing through the base end curved portion 58d on the inner peripheral side.

[0154] In the side protrusions 551 and 552, the outer peripheral protrusion side 56b and the inner peripheral protrusion side 56c are inclined relative to the depth direction of the recess 60. The outer peripheral protrusion side 56b extends along the inclined surface 68 of the outer peripheral recess wall surface 63. The inclination angles of the outer peripheral protrusion side 56b and the inclined surface 68 relative to the depth direction of the recess 60 are approximately the same. The outer peripheral protrusion side 56b and the inclined surface 68 extend parallel to each other and are opposite to each other.

[0155] When the side protrusions 551 and 552 contact the outer peripheral concave wall surface 63, the side surface 56b of the outer peripheral protrusions overlaps with the inclined surface 68 in contact. Thus, by making the side surface 56b of the outer peripheral protrusions contact the inclined surface 68, the contact area between the side protrusions 551 and 552 and the outer peripheral concave wall surface 63 increases. Therefore, by extending the side surface 56b of the outer peripheral protrusions along the inclined surface 68, stress concentration in a single area at the contact portion between the side protrusions 551 and 552 and the outer peripheral concave wall surface 63 can be suppressed.

[0156] <Sixth Implementation Method>

[0157] In the sixth embodiment, the inner peripheral fin side 74 of the fin 70 has an inclined surface 78. The structures, functions, and effects not specifically described in the sixth embodiment are the same as those in the first to third embodiments. The sixth embodiment will be described focusing on the differences from the third embodiment described above.

[0158] like Figure 14 , Figure 15 As shown, the inner peripheral fin side surface 74 of the fin 70 has a raised surface 77 and an inclined surface 78. The raised surface 77 forms an end face on the side of the concave bottom surface 62 in the inner peripheral fin side surface 74. The raised surface 77 extends in the depth direction of the concave portion 60 in a direction intersecting with the lower cover 50. The inclined surface 78 is disposed on the side opposite to the concave bottom surface 62 in the depth direction of the concave portion 60, separated by the raised surface 77, and forms an end face on the side of the fin front end surface 72 in the inner peripheral fin side surface 74. The inclined surface 78 extends in a direction inclined relative to both the raised surface 77 and the fin front end surface 72, and connects the raised surface 77 to the fin front end surface 72. The inclination of the inclined surface 78 relative to the depth direction of the concave portion 60 is greater than the inclination of the raised surface 77 relative to the depth direction of the concave portion 60. The longitudinal section of the fin 70 is such that the protruding corners of the inner peripheral fin side surface 74 and the fin front end surface 72 are chamfered by the inclined surface 78.

[0159] In each of the upstream flow path 32a and the downstream flow path 32b, a plurality of protrusions 55 include protrusions 55 disposed at positions that contact the inclined surfaces 78 of the inner circumferential fin side surface 74. For example, the upstream fin side protrusion 553 and the downstream fin side protrusion 554 are respectively disposed at positions that contact the inclined surfaces 78 of the inner circumferential fin side surface 74.

[0160] The fin side protrusions 553 and 554 are positioned closer to the inclined surface 78 than the upright surface 77 in the depth direction of the recess 60. The fin side protrusions 553 and 554 and the upright surface 77 are arranged along the depth direction of the recess 60. The fin side protrusions 553 and 554 are arranged side-by-side on the inclined surface 78 in the width direction of the bottom plate flow path 32. At least a portion of the outer surface 56 of the fin side protrusions 553 and 554 contacts the inclined surface 78. The front end bend 58a of the outer peripheral side of the fin side protrusions 553 and 554 is located closest to the inclined surface 78 and is most likely to contact the inclined surface 78.

[0161] The inclined surface 78 is inclined such that it extends along the front bend 58a of the outer peripheral side. Therefore, if the front bend 58a of the outer peripheral side contacts the inclined surface 78, the contact area between the fin side protrusions 553, 554 and the inner peripheral fin side surface 74 tends to increase. Therefore, by making the front bend 58a of the outer peripheral side contact the inclined surface 78, stress concentration in a single area at the contact portion between the protrusions 55 and the inner peripheral fin side surface 74 can be suppressed. The inclined surface 78 is inclined relative to the outer peripheral protrusion side surface 56b and the inner peripheral protrusion side surface 56c of the fin side protrusions 553, 554.

[0162] According to this embodiment, in the inner peripheral fin side surface 74, the inclined surface 78 that contacts the fin side protrusions 553, 554 is inclined relative to the depth direction of the recess 60. Therefore, even if the relative positions of the fin side protrusions 553, 554 with respect to the inner peripheral fin side surface 74 are slightly offset in the width direction of the bottom plate flow path 32 due to manufacturing errors, the fin side protrusions 553, 554 can easily contact the inclined surface 78 of the inner peripheral fin side surface 74.

[0163] In the event that the lower cover 50 elastically deforms due to increased internal pressure in the bottom plate flow path 32, it is assumed that the fin side protrusions 553 and 554 are inclined such that the opening of the inner surface 57 of the protrusion faces the inner peripheral fin side surface 74. In this case, since the inclination angle of the outer peripheral protrusion side surface 56b is close to the inclination angle of the inclined surface 78, the outer peripheral protrusion side surface 56b of the fin side protrusions 553 and 554 is more likely to come into contact with the inclined surface 78. For the lower cover 50, even if either the front end bend 58a of the outer peripheral side or the outer peripheral protrusion side surface 56b comes into contact with the inclined surface 78, the contact area between the fin side protrusions 553 and 554 and the inner peripheral protrusion side surface 74 is likely to increase. Therefore, even assuming that the lower cover 50 deforms, the inclination surface 78 can suppress the concentration of stress in a portion of the contact area between the protrusions 55 and the inner peripheral fin side surface 74.

[0164] <Seventh Implementation>

[0165] In the sixth embodiment described above, the outer peripheral protruding side 56b of the protrusion 55 is inclined relative to the inclined surface 78 of the fin 70. In contrast, in the seventh embodiment, the outer peripheral protruding side 56b extends along the inclined surface 78. The structures, functions, and effects in the seventh embodiment, unless otherwise specified, are the same as in the first to third and sixth embodiments. The seventh embodiment will be described focusing on the differences from the sixth embodiment described above.

[0166] In this embodiment, such as Figure 16 As shown, the shapes of the fin side protrusions 553 and 554 are substantially the same as those of the wall side protrusions 551 and 552 in the fifth embodiment described above. The fin side protrusions 553 and 554 are not curved and are generally straight. Similar to the wall side protrusions 551 and 552 in the fifth embodiment described above, the fin side protrusions 553 and 554 do not have curved portions 58a to 58d.

[0167] In the fin side protrusions 553 and 554, the outer circumferential protrusion side 56b and the inner circumferential protrusion side 56c are inclined relative to the depth direction of the recess 60. The outer circumferential protrusion side 56b extends along the inclined surface 78 of the inner circumferential fin side 74. The inclination angles of the outer circumferential protrusion side 56b and the inclined surface 78 relative to the depth direction of the recess 60 are approximately the same. The outer circumferential protrusion side 56b and the inclined surface 78 extend parallel to each other and are opposite to each other.

[0168] When the fin side protrusions 553 and 554 contact the inner circumferential fin side surface 74, the outer circumferential protrusion side surface 56b contacts the inclined surface 78 in an overlapping manner. Thus, by making the outer circumferential protrusion side surface 56b contact the inclined surface 78, the contact area between the fin side protrusions 553 and 554 and the inner circumferential protrusion side surface 74 is increased. Therefore, by extending the outer circumferential protrusion side surface 56b along the inclined surface 78, stress concentration in a single area at the contact portion between the fin side protrusions 553 and 554 and the inner circumferential protrusion side surface 74 can be suppressed.

[0169] <Eighth Implementation Method>

[0170] In the first to third embodiments described above, the outer peripheral protruding side 56b of the protrusion 55 contacts the outer peripheral concave wall surface 63 or the inner peripheral fin side surface 74. In contrast, in the eighth embodiment, the inner peripheral protruding side 56c of the protrusion 55 contacts the inner peripheral concave wall surface 64 or the outer peripheral fin side surface 73. The structures, functions, and effects not specifically described in the eighth embodiment are the same as in the first to third embodiments. In the eighth embodiment, the description will focus on the differences from the first to third embodiments described above.

[0171] like Figure 17As shown, side wall protrusions 551 and 552 are positioned to contact the inner peripheral concave wall surface 64 of the recess 60. Side wall protrusions 551 and 552 are arranged in the width direction of the bottom plate flow path 32 between the innermost fin 70 and the inner peripheral bottom plate wall 43. The inner peripheral protrusion side surface 56c of the side wall protrusions 551 and 552 and the inner peripheral concave wall surface 64 are opposite to and in contact with each other. The outer peripheral protrusion side surface 56b of the side wall protrusions 551 and 552 are opposite to the outer peripheral fin side surface 73 of the fin 70 adjacent to the side wall protrusions 551 and 552, and are separated from each other in the width direction of the bottom plate flow path 32. Furthermore, the inner peripheral concave wall surface 64 corresponds to both the intersecting surface and the peripheral wall surface.

[0172] In this embodiment, by bringing the side wall protrusions 551 and 552 into contact with the inner peripheral concave wall surface 64, the stress caused by the increased internal pressure of the bottom plate flow path 32 acts by pressing the side wall protrusions 551 and 552 against the inner peripheral concave wall surface 64, thereby applying stress to the inner peripheral concave wall surface 64 via the side wall protrusions 551 and 552. Thus, by applying stress to the inner peripheral concave wall surface 64 from the lower cover 50, it is difficult for stress concentration to occur in the lower cover 50 at a portion such as the inner peripheral end of the joint 37. Therefore, similar to the structure in the first and third embodiments described above where the side wall protrusions 551 and 552 contact the outer peripheral concave wall surface 63, it is possible to suppress stress concentration in a portion of the lower cover 50, preventing localized deformation of the lower cover 50 and subsequent plastic deformation.

[0173] The upstream wall-side protrusion 551 of the wall-side protrusions 551 and 552 is positioned in contact with the inner circumferential concave wall surface 64 of the upstream recess 601. The upstream wall-side protrusion 551 is positioned between the inner circumferential joining plate portion 53 and the upstream flow path plate portion 541 in the width direction of the upstream flow path 32a, and connects these inner circumferential joining plate portions 53 to the upstream flow path plate portion 541. The downstream wall-side protrusion 552 is positioned in contact with the inner circumferential concave wall surface 64 of the downstream recess 602. The downstream wall-side protrusion 552 is positioned between the inner circumferential joining plate portion 53 and the downstream flow path plate portion 542 in the width direction of the downstream flow path 32b, and connects these inner circumferential joining plate portions 53 to the downstream flow path plate portion 542.

[0174] Fin side protrusions 553 and 554 are positioned in contact with the outer peripheral fin side surface 73 of the fin 70. Multiple fin side protrusions 553 and 554 are arranged in the width direction of the bottom plate flow path 32. These multiple fin side protrusions 553 and 554 include: fin side protrusions 553 and 554 positioned between the outermost fin 70 and the outer peripheral concave wall surface 63; and fin side protrusions 553 and 554 positioned between two adjacent fins 70. The inner peripheral protrusion side surface 56c of the fin side protrusions 553 and 554 faces and contacts the outer peripheral fin side surface 73. The outer peripheral protrusion side surface 56b faces the outer peripheral concave wall surface 63 or the inner peripheral fin side surface 74 of the adjacent fin 70, and is separated from these outer peripheral concave wall surfaces 63 or inner peripheral fin side surfaces 74 in the width direction of the bottom plate flow path 32. In addition, the outer fin side surface 73 corresponds to the cross surface and the fin side surface.

[0175] In this embodiment, since the fin side protrusions 553 and 554 are in contact with the outer peripheral fin side surface 73, the stress caused by the increased internal pressure of the bottom plate flow path 32 acts by pressing the fin side protrusions 553 and 554 against the outer peripheral fin side surface 73. This stress is applied to the outer peripheral fin side surface 73 via the fin side protrusions 553 and 554. Thus, by applying stress to the outer peripheral fin side surface 73 from the lower cover 50, it is difficult for stress to concentrate in a part of the lower cover 50, such as the inner peripheral end of the joint 37. Therefore, similar to the structure in the second and third embodiments described above where the fin side protrusions 553 and 554 are in contact with the inner peripheral fin side surface 74, it is possible to suppress stress concentration in a part of the lower cover 50, which could cause local deformation of the lower cover 50 and plastic deformation.

[0176] The upstream fin side protrusion 553 is positioned in contact with the outer peripheral fin side surface 73 of the upstream fin 701. The downstream fin side protrusion 554 is positioned in contact with the outer peripheral fin side surface 73 of the downstream fin 702.

[0177] Next, the manufacturing method of the housing 20 in the eighth embodiment will be described. When the lower cover 50 is temporarily installed on the housing body 40 during the temporary installation process, the inner peripheral bottom plate wall portion 43 is fitted between the upstream wall side protrusion 551 and the downstream wall side protrusion 552. Furthermore, in this case, the upstream fin 701 and the downstream fin 702 are fitted between the upstream fin side protrusion 553 and the downstream fin side protrusion 554. In this state, by contacting the wall side protrusions 551 and 552 with the inner peripheral concave wall surface 64 and by contacting the fin side protrusions 553 and 554 with the outer peripheral fin side surface 73, the positional displacement of the lower cover 50 relative to the housing body 40 in the Z direction can be suppressed.

[0178] When the joining operation is performed after the temporary installation process, the wall-side protrusions 551 and 552 are in contact with the inner peripheral concave wall surface 64, and the fin-side protrusions 553 and 554 are in contact with the outer peripheral fin side surface 73. Therefore, similar to the completed power conversion device 10, the stress generated by the linear expansion of the lower cover 50, etc., is applied from the wall-side protrusions 551 and 552 to the inner peripheral concave wall surface 64, and is easily applied from the fin-side protrusions 553 and 554 to the outer peripheral fin side surface 73. As a result, plastic deformation of the lower cover 50 can be suppressed.

[0179] According to this embodiment, the wall-side protrusions 551 and 552 extending in a direction intersecting the flow path plate portion 54 and the inner peripheral concave wall surface 64 extending in a direction intersecting the flow path plate portion 54 are in contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the bottom plate flow path 32 or linear expansion of the lower cover 50, this stress will be applied to the inner peripheral concave wall surface 64 from the wall-side protrusions 551 and 552. Therefore, plastic deformation of the lower cover 50 can be suppressed by the wall-side protrusions 551 and 552.

[0180] According to this embodiment, the side protrusions 551 and 552 contact the inner peripheral concave wall surface 64. Therefore, even if stress is generated due to an increase in internal pressure in the bottom plate flow path 32, stress can be applied to the inner peripheral concave wall surface 64 from the side protrusions 551 and 552 without waiting for the elastic deformation of the lower cover 50 caused by the stress. Therefore, stress can be applied to the inner peripheral concave wall surface 64 from the lower cover 50 more reliably. Therefore, similar to the first embodiment described above, stress concentration on a portion of the lower cover 50 can be more reliably suppressed.

[0181] According to this embodiment, the inner peripheral concave wall surface 64 that contacts the wall-side protrusions 551 and 552 forms the periphery of the bottom plate flow path 32. In this structure, the stress applied to the inner peripheral concave wall surface 64 by the wall-side protrusions 551 and 552 is applied to the inner peripheral bottom plate wall portion 43 that forms the inner peripheral concave wall surface 64. For example, compared to the fin 70, the inner peripheral bottom plate wall portion 43 has higher strength due to its larger volume or the formation of the lower surface 41a of the main body. Therefore, even if stress is applied to the inner peripheral concave wall surface 64 by the wall-side protrusions 551 and 552, it is difficult for the inner peripheral bottom plate wall portion 43 to deform due to the stress. Therefore, the bottom plate flow path 32 formed by the inner peripheral bottom plate wall portion 43 can be maintained in an appropriate state.

[0182] According to this embodiment, since the inner peripheral protruding side surface 56c of the wall-side protrusions 551 and 552 contacts the inner peripheral concave wall surface 64, the contact area between the wall-side protrusions 551 and 552 and the outer peripheral protruding side surface 56b is easily increased. Therefore, it is difficult for stress concentration to occur in a single area at the contact portion between the wall-side protrusions 551 and 552 and the inner peripheral concave wall surface 64. Therefore, it is possible to suppress localized deformation of the wall-side protrusions 551 and 552 in contact with the inner peripheral concave wall surface 64, thus preventing plastic deformation of the wall-side protrusions 551 and 552.

[0183] According to this embodiment, the fin side protrusions 553, 554 extending in the direction intersecting the flow path plate portion 54 and the outer peripheral fin side surface 73 extending in the direction intersecting the flow path plate portion 54 are in contact with each other. Therefore, even if stress is generated due to an increase in the internal pressure of the bottom plate flow path 32 or linear expansion of the lower cover 50, this stress will be applied to the outer peripheral fin side surface 73 from the fin side protrusions 553, 554. Therefore, similar to the second embodiment described above, plastic deformation of the lower cover 50 can be suppressed.

[0184] According to this embodiment, the fin side protrusions 553 and 554 contact the outer peripheral fin side surface 73. Therefore, even if stress is generated due to an increase in internal pressure in the bottom plate flow path 32, stress can be applied from the fin side protrusions 553 and 554 to the outer peripheral fin side surface 73 without waiting for the elastic deformation of the lower cover 50 caused by the stress. Therefore, stress can be applied to the outer peripheral fin side surface 73 from the lower cover 50 more reliably. Therefore, similarly to the second embodiment described above, stress concentration on a portion of the lower cover 50 can be more reliably suppressed.

[0185] According to this embodiment, the outer peripheral fin side surface 73 is contained within the fin outer surface 71 of the fin 70. In this structure, the stress applied to the outer peripheral fin side surface 73 from the fin side protrusions 553, 554 is applied to the fin 70. Therefore, similarly to the second embodiment described above, the fin 70 can achieve both increasing the contact area between the inner surface 61 of the recess 60 and the refrigerant in the bottom plate flow path 32, thereby improving the cooling effect of the refrigerant, and suppressing local deformation of the lower cover 50.

[0186] According to this embodiment, since the inner peripheral rib side surface 56c of the fin side ribs 553 and 554 contacts the outer peripheral fin side surface 73 of the fin 70, the contact area between the fin side ribs 553 and 554 and the fin 70 is easily increased. Therefore, it is difficult for stress to concentrate in a single area at the contact portion between the fin side ribs 553 and 554 and the outer peripheral fin side surface 73. Therefore, similarly to the second embodiment described above, it is possible to suppress localized deformation of the fin side ribs 553 and 554 in contact with the fin 70, thus preventing plastic deformation of the fin side ribs 553 and 554.

[0187] As described in the fourth and sixth embodiments above, when the lower cover 50 elastically deforms due to an increase in internal pressure in the bottom plate flow path 32, it is assumed that the wall-side protrusions 551, 552 or the fin-side protrusions 553, 554 will tilt so that the opening of the inner surface 57 of the protrusion is oriented towards the outer peripheral concave wall surface 63. In this embodiment, when the wall-side protrusions 551, 552 are tilted, the inner peripheral protrusion side 56c or the front end bend 58b of the inner peripheral side of the wall-side protrusions 551, 552 is easily pressed against the inner peripheral concave wall surface 64. Therefore, a structure in which the wall-side protrusions 551, 552 reliably contact the inner peripheral concave wall surface 64 can be achieved. Similarly, when the fin-side protrusions 553, 554 are tilted, the inner peripheral protrusion side 56c or the front end bend 58b of the inner peripheral side of the fin-side protrusions 553, 554 is easily pressed against the outer peripheral protrusion side 73. Therefore, a structure can be achieved in which the fin side protrusions 553 and 554 reliably contact the outer peripheral fin side surface 73.

[0188] <Ninth Implementation Method>

[0189] In the first embodiment described above, the wall-side protrusions 551 and 552 are positioned in contact with the outer peripheral concave wall surface 63. In the eighth embodiment described above, the wall-side protrusions 551 and 552 are positioned in contact with the inner peripheral concave wall surface 64. In contrast, in the ninth embodiment, the wall-side protrusions 551 and 552 are positioned in contact with the outer peripheral concave wall surface 63 and the inner peripheral concave wall surface 64, respectively. The structures, functions, and effects not specifically described in the ninth embodiment are the same as in the first and eighth embodiments. The ninth embodiment will be described focusing on the differences from the first and eighth embodiments described above.

[0190] like Figure 18 As shown, multiple wall-side protrusions 551 and 552 are arranged in the width direction of the bottom plate flow path 32. In this embodiment, two wall-side protrusions 551 and 552 are arranged in the width direction of the bottom plate flow path 32. A flow path plate portion 54 is provided between two wall-side protrusions 551 and 552. The flow path plate portion 54 connects the two wall-side protrusions 551 and 552. The outer peripheral wall-side protrusions 551 and 552 are positioned in contact with the outer peripheral concave wall surface 63. The inner peripheral wall-side protrusions 551 and 552 are positioned in contact with the inner peripheral concave wall surface 64.

[0191] In the upstream flow path 32a, the upstream flow path plate portion 541 is disposed between two upstream wall side protrusions 551 and these upstream wall side protrusions 551 are connected. The outer peripheral upstream wall side protrusion 551 of the two upstream wall side protrusions 551 contacts the outer peripheral concave wall surface 63, and the inner peripheral upstream wall side protrusion 551 contacts the inner peripheral concave wall surface 64.

[0192] In the downstream flow path 32b, the downstream flow path plate portion 542 is disposed between two downstream wall side protrusions 552 and connects these downstream wall side protrusions 552. The outer peripheral downstream wall side protrusion 552 of the two downstream wall side protrusions 552 contacts the outer peripheral concave wall surface 63, and the inner peripheral downstream wall side protrusion 552 contacts the inner peripheral wall surface.

[0193] The flow path plate portion 54 is positioned at a different height than the connecting plate portions 52 and 53 in the depth direction of the recess 60. In this embodiment, the flow path plate portion 54 is positioned closer to the bottom surface 62 of the recess than the connecting plate portions 52 and 53 in the depth direction of the recess 60. The height dimension of the fin 70 is smaller than the depth dimension of the recess 60 in the depth direction of the recess 60. Similar to the first embodiment described above, the flow path plate portion 54 overlaps with the fin front end face 72 of the fin 70.

[0194] The wall-side protrusions 551 and 552 extend along the depth direction of the recess 60 in such a way that they are mounted on the connecting plate portions 52 and 53 and the flow path plate portion 54. The wall-side protrusions 551 and 552 extend from the flow path plate portion 54 toward the side opposite to the bottom surface 62 of the recess, and are in a state of extending from the connecting plate portions 52 and 53 toward the bottom surface 62 of the recess.

[0195] The wall-side protrusions 551 and 552 are curved in shape. The outer peripheral wall-side protrusions 551 and 552 are formed by the outer peripheral protrusion side surface 56b, the outer peripheral front end bend 58a, and the outer peripheral base bend 58c of the wall-side protrusions 551 and 552 in the first embodiment. The inner peripheral wall-side protrusions 551 and 552 are formed by the inner peripheral protrusion side surface 56c, the inner peripheral front end bend 58b, and the inner peripheral base bend 58d of the wall-side protrusions 551 and 552 in the first embodiment.

[0196] Next, the manufacturing method of the housing 20 in the ninth embodiment will be described. When the lower cover 50 is temporarily installed on the housing body 40 during the temporary installation process, the wall-side protrusions 551 and 552, together with the flow path plate portion 54, are fitted between the outer peripheral concave wall surface 63 and the inner peripheral concave wall surface 64 of the recess 60. In this case, by contacting the wall-side protrusions 551 and 552 with the concave wall surfaces 63 and 64, the positional displacement of the lower cover 50 relative to the housing body 40 in the Z direction can be suppressed.

[0197] <Tenth Implementation>

[0198] In the first and eighth embodiments described above, the protrusion 55 is positioned in contact with the concave wall surfaces 63 and 64. In the second and eighth embodiments described above, the protrusion 55 is positioned in contact with the fin side surfaces 73 and 74. In contrast, in the tenth embodiment, the protrusion 55 is positioned separately from both the concave wall surfaces 63 and 64 and the fin side surfaces 73 and 74. The structures, functions, and effects not specifically described in the tenth embodiment are the same as in the first, second, and eighth embodiments. The tenth embodiment will be described focusing on the differences from the first embodiment described above.

[0199] In this embodiment, such as Figure 19 As shown, the protrusion 55 is not positioned at either the location contacting the concave wall surfaces 63 and 64 or the location contacting the fin sides 73 and 74. The protrusion 55 is positioned in the width direction of the bottom plate flow path 32 at a location separate from both the concave wall surfaces 63 and 64 and the fin sides 73 and 74. That is, the protrusion 55 is positioned at a location that does not contact either the concave wall surfaces 63 and 64 or the fin sides 73 and 74.

[0200] The protrusions 55 that do not contact any of the concave wall surfaces 63 and 64 or the fin side surfaces 73 and 74 are also called separation protrusions 555 and 556. The upstream separation protrusion 555 is positioned for the upstream flow path 32a, and the downstream separation protrusion 556 is positioned for the downstream flow path 32b. The separation protrusions 555 and 556 correspond to the connecting portion and the separating connecting portion, respectively.

[0201] Multiple separation protrusions 555 and 556 are arranged in the width direction of the bottom plate flow path 32. A fin 70 is provided between adjacent separation protrusions 555 and 556 in the width direction of the bottom plate flow path 32. The separation protrusions 555 and 556 are not directly connected to the connecting plates 52 and 53, but are indirectly connected to them via the flow path plate 54. Adjacent separation protrusions 555 and 556 in the width direction of the bottom plate flow path 32 are connected via the flow path plate 54. As described for protrusion 55 in the first embodiment above, the separation protrusions 555 and 556 are generally curved.

[0202] According to this embodiment, even if stress is generated due to increased internal pressure in the bottom plate flow path 32 or linear expansion of the lower cover 50, the separation protrusions 555 and 556 are easily deformed by this stress. Thus, by applying stress to the separation protrusions 555 and 556, it is difficult for stress concentration to occur in the lower cover 50 at a portion such as the inner circumferential end of the joint 37. Therefore, it is possible to suppress the localized deformation of the joint plates 52 and 53 and the flow path plate 54 in the lower cover 50 due to stress concentration, thereby preventing plastic deformation.

[0203] According to this embodiment, because the separation protrusions 555 and 556 are bent, they are easily elastically deformed as a whole. Therefore, when stress is applied to the separation protrusions 555 and 556, the overall elastic deformation of the separation protrusions 555 and 556 makes it difficult for stress concentration to occur in a part of the separation protrusions 555 and 556. Therefore, it is possible to suppress the plastic deformation of the separation protrusions 555 and 556 due to localized deformation.

[0204] <Other Implementation Methods>

[0205] This disclosure is not limited to the illustrated embodiments. This disclosure includes illustrated embodiments and modifications made by those skilled in the art based thereon. For example, the disclosure is not limited to the combinations of components and elements shown in the embodiments, and various modifications can be made to implement it. The disclosure can be implemented in various combinations. This disclosure may have additional portions that can be added to the embodiments. The disclosure includes structures that omit components and elements of the embodiments. The disclosure includes substitutions or combinations of components and elements between one embodiment and another. The scope of the disclosure is not limited to the description of the embodiments. The scope of the disclosure is indicated by the description in the claims, and should be understood to also include all modifications within the meaning and scope equivalent to the description in the claims.

[0206] In the above embodiments, the protrusion 55 can extend in the direction intersecting with the flow path plate portion 54. It can extend from the flow path plate portion 54, the connecting plate portions 52 and 53 toward the interior of the recess 60, or it can extend toward the side opposite to the recess 60. For example, in the first embodiment described above, the protrusion 55 can also protrude in the lower cover 50 toward the side opposite to the recess 60. In addition, in the ninth embodiment described above, the protrusion 55 can also protrude from the flow path plate portion 54 toward the recess 60, and the protrusion 55 can also protrude from the connecting plate portions 52 and 53 toward the side opposite to the recess 60.

[0207] However, to achieve a structure in which the protrusion 55 contacts the concave wall surfaces 63, 64 or the fin side surfaces 73, 74, it is preferable that the protrusion 55 extends toward the concave portion 60 from at least one of the joining plate portions 52, 53 and the flow path plate portion 54. For example, if the outer surface 56 of the protrusion 55 extends toward the concave portion 60, a structure in which the protrusion 55 contacts the concave wall surfaces 63, 64 and the fin side surfaces 73, 74 can be achieved. In this structure, the protrusion 55 may also not have an inner surface 57, and the protrusion 55 may protrude in both directions toward the concave portion 60 and the side opposite to the concave portion 60.

[0208] In the above embodiments, the protrusion 55 may simply extend in the direction intersecting the flow path plate portion 54, and may not be curved. For example, as in the fifth and seventh embodiments described above, the longitudinal section of the protrusion 55 may be a straight shape. Alternatively, the protrusion 55 may be curved in at least a portion of its longitudinal section. For example, in the first embodiment described above, if the protrusion 55 has at least one of the front end curved portions 58a and 58b and the base end curved portions 58c and 58d, it is curved in at least a portion of its longitudinal section.

[0209] In the above embodiments, the protrusion 55 may not be a wide and flat shape, but rather a longitudinally elongated and flat shape. For example, in the protrusion 55, the height dimension in the Y direction may be greater than the width dimension in the Z direction. In this structure, by making the protrusion sides 56b and 56c as long as possible in the Y direction, the contact area between the protrusion sides 56b and 56c and the concave wall surfaces 63 and 64 and the fin sides 73 and 74 can be expanded.

[0210] In the above embodiments, multiple protrusions 55 may be provided in the flow path such as the bottom plate flow path 32, or only one may be provided. For example, in the first embodiment described above, the protrusion 55 may also be positioned across the curved path 32c and erected in the upstream flow path 32a and the downstream flow path 32b. In this structure, the portion of the protrusion 55 disposed in the upstream flow path 32a corresponds to the first connecting portion, and the portion disposed in the downstream flow path 32b corresponds to the second connecting portion. In addition, the protrusion 55 may also extend in a direction intersecting the upstream and downstream directions of the bottom plate flow path 32.

[0211] In the above embodiments, multiple fins 70 may be provided in the width direction of the bottom plate flow path 32, or only one may be provided. Furthermore, multiple fins 70 may be arranged in the upstream and downstream direction of the bottom plate flow path 32. The shape or size of the fin's front end face 72 may be such that it moves away from the lower cover 50 towards the concave bottom surface 62. Moreover, the fins 70 may not be positioned between adjacent protrusions 55 in the width direction of the bottom plate flow path 32. In other words, multiple protrusions 55 may be arranged between adjacent fins 70 in the width direction of the bottom plate flow path 32.

[0212] In the above embodiments, in the bottom plate flow path 32, the refrigerant flow directions in the upstream flow path 32a (which serves as the first flow path) and the downstream flow path 32b (which serves as the second flow path) may not be opposite. For example, the refrigerant flow directions in the upstream flow path 32a and the downstream flow path 32b may be the same. Furthermore, the first and second flow paths may not be arranged in the upstream-downstream direction, but rather arranged side-by-side relative to the upstream-downstream direction. In this case, for example, the portion of the bottom plate portion 41 where the lower cover 50 is joined by the joint portion 37 corresponds to a partition portion, and the portion of the lower cover 50 that is not joined corresponds to a fin.

[0213] In the above embodiments, the first flow path and the second flow path in the bottom plate flow path 32 may not be arranged side by side. For example, the bottom plate flow path 32 may have only one flow path extending in the X direction. In addition, the flow path may be curved or bent instead of extending straight like the upstream flow path 32a or the downstream flow path 32b.

[0214] In the above embodiments, the housing 20 can be formed as long as it can form a flow path for fluid flow, and it can also be formed of resin material or the like.

[0215] In the above embodiments, in the bottom plate portion 23 of the housing, the flow path cover such as the lower cover 50 may be formed as the upper surface 23a of the bottom plate instead of the lower surface 23b. That is, the opening of the recess 60 may not face the side opposite to the internal space 21, but rather face the internal space 21. In this case, in the housing body 40, the upper surface of the main body bottom plate portion 41 corresponds to the main body surface.

[0216] In the above embodiments, the portion of the housing 20 that divides the internal space 21 can be used, and the portion where the flow path is provided does not necessarily have to be the outer wall 24 of the housing. For example, the flow path can also be provided on the outer wall 24 of the housing. In addition, if the housing 20 has a top or partition portion that divides the internal space 21, the flow path can also be provided in these top or partition portions. For example, in a structure where the flow path is provided on the outer wall 24 of the housing, the flow path cover forms the inner or outer wall surface of the outer wall 24 of the housing.

[0217] In the above embodiments, if the fluid flowing in the flow path formed by the housing 20 can exchange heat with the air or electrical components inside the housing 20, a heating effect can be achieved instead of a cooling effect. In structures where the fluid achieves a heating effect, the device comprising the housing 20 is sometimes referred to as a heater rather than a cooler 30. Furthermore, the housing 20 or the power conversion device 10 may also be a structure not intended to allow heat exchange between the fluid and the air or electrical components inside the housing 20. For example, the thermal conductivity of the housing body 40 or the lower cover 50 may be reduced.

[0218] In the above embodiments, electrical components housed in the housing 20 may include, in addition to the converter unit 15, transformers, motors, busbars, terminal blocks, etc. Electrical devices including electrical components may include, in addition to the power conversion device 10, transformer devices including transformers, motor devices including motors, etc. Furthermore, power conversion devices 10 may include, in addition to converter devices, inverter devices, AC input DC output power supplies, DC input DC output power supplies, AC input AC output power supplies, etc.

[0219] In the above embodiments, vehicles equipped with the power conversion device 10 include passenger cars, buses, construction vehicles, and agricultural machinery vehicles. Furthermore, vehicles are one type of mobile body; besides vehicles, other mobile bodies equipped with the power conversion device 10 include trams and airplanes.

[0220] In the above embodiments, the power conversion device 10 and the housing 20 are mobile electrical devices and housings installed on mobile bodies such as vehicles, but they can also be fixed electrical devices and housings.

Claims

1. A housing having a flow path for fluid flow formed extending along its own internal space, the housing comprising: The housing body has a main surface and forms the internal space, and the main surface is provided with a recess forming the flow path; as well as A plate-shaped flow path cover is mounted on the main body surface to cover the recess, and together with the recess, forms the flow path. The flow path cover has: A pair of joining plate portions, the pair of joining plate portions being joined to the main body surface via a joining portion, and arranged across the flow path in the width direction of the flow path; A flow path plate portion is disposed between a pair of the connecting plate portions and is opposite to the recessed portion across the flow path while extending along the width direction; as well as A connecting portion is disposed between the joining plate portion and the flow path plate portion, connects to the flow path plate portion, and extends in a direction intersecting the flow path plate portion. The inner surface of the recess has an intersecting surface extending in a direction intersecting the flow path plate portion. As the connecting portion, the flow path cover has a contact connection portion that extends from the flow path plate portion toward the recess and is positioned to contact the intersecting surface. The intersecting surfaces have: A raised surface that extends along the depth direction of the recess; as well as An inclined surface is disposed between the upright surface and the connecting plate portion in the depth direction, and the inclination relative to the depth direction is greater than that of the upright surface. The contact connection portion is located at the position that contacts the inclined surface.

2. The housing as claimed in claim 1, characterized in that, The contact connection portion contacts the cross surface.

3. The housing as described in claim 1, characterized in that, The intersecting surface has a peripheral wall surface that forms the periphery of the flow path. As the contact connection portion, the flow path cover has a wall-side connection portion that connects the joining plate portion to the flow path plate portion and is disposed at a position that contacts the peripheral wall surface.

4. The housing as claimed in claim 1, characterized in that, The cross surface has a fin side extending from the inner surface of the recess toward the flow path cover, i.e., the fin side. The flow path plate portions are arranged in multiples along the width direction between a pair of the connecting plate portions. As the contact connection portion, the flow path cover has a fin-side connection portion, which connects two adjacent flow path plate portions in the width direction and is located at a position that contacts the side of the fin.

5. The housing as claimed in claim 1, characterized in that, The connecting portion is bent in a manner that bulges out in a direction that intersects with the flow path plate portion.

6. The housing as claimed in any one of claims 1 to 5, characterized in that, The flow path has a first flow path and a second flow path extending along the first flow path. The housing body has a partition portion disposed between the first flow path and the second flow path, thereby separating the first flow path from the second flow path. The flow path cover is erected across the partition between the first and second flow paths in the arrangement direction of the first and second flow paths. As the joining plate portion, the flow path cover has: A partition joint plate portion is disposed between the first flow path and the second flow path, and is engaged with the partition portion; A first joining plate portion is disposed on the side opposite to the separating joining plate portion, separated by the first flow path; as well as The second joining plate portion is disposed on the opposite side of the separating joining plate portion, separated by the second flow path. As the flow path plate portion, the flow path cover has: A first flow path plate portion is disposed between the first joining plate portion and the separating joining plate portion, and is opposite to the recessed portion across the first flow path while extending along the arrangement direction; as well as The second flow path plate portion is disposed between the second joining plate portion and the separating joining plate portion, and extends along the arrangement direction while facing the recess across the second flow path. As the connecting part, the flow path cover has: A first connecting portion is disposed between the first joining plate portion and the first flow path plate portion, is connected to the first flow path plate portion, and extends in a direction intersecting the first flow path plate portion; as well as The second connecting portion is disposed between the second joining plate portion and the second flow path plate portion, is connected to the second flow path plate portion, and extends in a direction intersecting the second flow path plate portion.

7. The housing as claimed in claim 6, characterized in that, The recess has: The first peripheral wall, on the side opposite to the partition portion across the first flow path, forms the periphery of the first flow path; as well as The second peripheral wall, on the side opposite to the partition portion across the second flow path, forms the peripheral edge of the second flow path. The first connecting portion connects the first joining plate portion to the first flow path plate portion, and is positioned at a contact point with the first peripheral wall surface. The second connecting portion connects the second joining plate portion to the second flow path plate portion and is positioned at a location that contacts the second peripheral wall surface.

8. An electrical device comprising electrical components and a housing containing the electrical components within its own internal space, and a flow path for fluid flow is formed extending along the electrical components. The housing has: A housing body having a main surface and forming the internal space, the main surface being provided with a recess forming the flow path; and A plate-shaped flow path cover is mounted on the main body surface to cover the recess, and together with the recess, forms the flow path. The flow path cover has: A pair of joining plate portions, the pair of joining plate portions being joined to the main body surface via a joining portion, and arranged across the flow path in the width direction of the flow path; A flow path plate portion is disposed between a pair of the connecting plate portions and is opposite to the recessed portion across the flow path while extending along the width direction; as well as A connecting portion is disposed between the joining plate portion and the flow path plate portion, connects to the flow path plate portion, and extends in a direction intersecting the flow path plate portion. The inner surface of the recess has an intersecting surface extending in a direction intersecting the flow path plate portion. As the connecting portion, the flow path cover has a contact connection portion that extends from the flow path plate portion toward the recess and is positioned to contact the intersecting surface. The intersecting surfaces have: A raised surface that extends along the depth direction of the recess; as well as An inclined surface is disposed between the upright surface and the connecting plate portion in the depth direction, and the inclination relative to the depth direction is greater than that of the upright surface. The contact connection portion is located at the position that contacts the inclined surface.

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