Circuit structure

Abstract

The present invention provides a circuit structure with a novel structure that can more reliably promote the heat dissipation of a heat-generating component with a short heat transfer path. The circuit structure (10) comprises: a heat-generating component (16); bus bars (34, 36) connected to the connecting portion (32a, 32b) of the heat-generating component (16); an insulating base member (28) for holding the heat-generating component (16) and the bus bars (34, 36); and a refrigerant flow path (104) disposed inside the base member (28) and for the refrigerant to flow, the bus bars (34, 36) being in thermal contact with the refrigerant flow path (104).

Description

Technical Field

[0001] The present disclosure relates to a circuit structure including a heat generating component. Background Art

[0002] Conventionally, a circuit structure including a heat generating component such as a relay is mounted on a vehicle. For example, Patent Document 1 discloses a circuit structure including a relay that disconnects or connects the power supply from a battery to a motor or a generator connected via an inverter as a load on the vehicle side.

[0003] Since a large current flows through the heat generating components such as relays used in this circuit structure, Joule heat proportional to the square of the current is generated, and the heat generation also increases. Therefore, in Patent Document 1, a structure is proposed for heat dissipation of the relay by using the middle part of a bus bar that connects the connection part of the relay housed in the housing to the connection terminal of the battery arranged outside the housing. Specifically, the following structure is disclosed: the heat generated by the relay is heat-conducted to the chassis or the housing by contacting the middle part of the bus bar extending outside the housing that houses the relay with the chassis, the housing that houses the entire power supply device, etc. through a heat transfer sheet.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2014-79093 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, the busbar constituting the conducting member connecting the relay to the battery needs to be thicker and larger in area to withstand large currents. Therefore, in the structure of Patent Document 1, a large busbar needs to be used to add a path for heat dissipation, which leads to problems such as increased material costs and processing costs. In addition, the large busbar needs to be led longer to other components provided outside the housing for heat dissipation, and it is inevitable that the distance between the connection part of the relay and the heat dissipation part becomes larger. Therefore, there is also the problem of not being able to efficiently dissipate the heat generated in the relay.

[0009] Therefore, a circuit structure having a novel structure capable of more reliably promoting heat dissipation of a heat-generating component through a short heat transfer path is disclosed.

[0010] Technical solutions to solve problems

[0011] The circuit structure disclosed in the present invention includes: a heat-generating component; a bus bar connected to a connection portion of the heat-generating component; an insulating base member for holding the heat-generating component and the bus bar; and a refrigerant flow path arranged inside the base member and through which the refrigerant flows, the bus bar being in thermal contact with the refrigerant flow path.

[0012] Effects of the Invention

[0013] According to the present disclosure, heat dissipation of a heat generating component can be more reliably promoted through a short heat transfer path. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is an exploded perspective view showing the circuit structure according to the first embodiment of the present disclosure.

[0015] Figure 2 yes Figure 1 A bottom view of the upper housing is shown.

[0016] Figure 3 This is a diagram schematically showing the electrical structure in the path from the power supply to the load.

[0017] Figure 4 yes Figure 1 The overall perspective view of the circuit structure shown.

[0018] Figure 5 yes Figure 4 A top view of the circuit structure shown.

[0019] Figure 6 yes Figure 5 Enlarged view of section VI-VI in FIG.

[0020] Figure 7 Yes Figure 1 2 is a cross-section of the upper shell and the lower shell in the assembled state, and is a diagram in which the refrigerant flow path is selected. DETAILED DESCRIPTION

[0021] <Description of Embodiments of the Present Disclosure>

[0022] First, embodiments of the present disclosure are listed for description.

[0023] The circuit structure disclosed in the present invention is:

[0024] (1) A circuit structure comprising: a heat generating component; a bus bar connected to a connection portion of the heat generating component; an insulating base member for holding the heat generating component and the bus bar; and a refrigerant flow path provided inside the base member and through which a refrigerant flows, the bus bar being in thermal contact with the refrigerant flow path.

[0025] According to the circuit structure disclosed in the present invention, a refrigerant flow path is provided inside a base member that holds a heat-generating component and a bus bar connected to a connecting portion of the heat-generating component, and the bus bar is in thermal contact with the refrigerant flow path. The bus bar that transfers heat from the heat-generating component can be brought into thermal contact with the refrigerant flow path for cooling, and the heat dissipation of the heat-generating component can be more reliably promoted with a short heat transfer path compared to the existing structure, thereby improving the heat dissipation performance of the circuit structure.

[0026] In particular, since the busbar that transfers heat from the heat generating components is cooled by the refrigerant flowing in the refrigerant flow path, the heat dissipation and cooling effects can be improved compared to the conventional structure in which the chassis and the housing that are in thermal contact with the busbar become high temperatures exceeding 70°C.

[0027] In addition, any refrigerant that circulates in the refrigerant flow path can be used as long as it is a refrigerant that can be used in the vehicle, such as radiator liquid. In addition, the thermal contact between the bus bar and the refrigerant flow path can be achieved by any structure such as arranging the bus bar around the refrigerant flow path or making the bus bar contact with the wall of the path that constitutes the refrigerant flow path. In addition, since the bus bar is connected to the connecting portion of the heat-generating component, the heat of the heat-generating component is advantageously transferred, but the bus bar connected to the connecting portion of the heat-generating component includes both a bus bar used as a conductive member and a bus bar used only for heat dissipation.

[0028] (2) Preferably, the base member has a passage wall portion constituting the refrigerant flow passage, and a portion of the bus bar is buried or pressed into the passage wall portion, thereby the bus bar is in thermal contact with the refrigerant flow passage. By burying or pressing a portion of the bus bar into the passage wall portion constituting the refrigerant flow passage, the bus bar can be in thermal contact with the refrigerant flow passage more reliably and stably, thereby further advantageously improving the heat dissipation performance of the circuit structure of the present disclosure.

[0029] (3) In the above (2), preferably, the base member includes a lower shell and an upper shell, the lower shell includes a lower passage wall portion, the upper shell includes an upper passage wall portion connected to the lower passage wall portion in a fluid-tight manner, and the refrigerant flow passage includes the lower passage wall portion and the upper passage wall portion connected in a fluid-tight manner. This is because the refrigerant flow passage can be formed in the base member with good space efficiency by a simple structure in which the lower passage wall portion provided in the lower shell constituting the base member is connected to the upper passage wall portion provided in the upper shell in a fluid-tight manner.

[0030] (4) In the above (3), preferably, the upper passage wall portion includes a cover portion and a protrusion portion, the cover portion covers the lower passage wall portion, the protrusion portion protrudes from the cover portion and protrudes into a groove divided by the lower passage wall portion and through which the refrigerant flows, and a portion of the bus bar is buried or pressed into the protrusion portion. Since the protrusion portion of the upper passage wall portion protrudes into the groove divided by the lower passage wall portion and through which the refrigerant flows, the protrusion portion is rapidly cooled by the refrigerant circulating around it. Furthermore, since a portion of the bus bar is buried or pressed relative to the protrusion portion, the bus bar can be rapidly cooled by the refrigerant, which can further advantageously promote the heat dissipation of the heat-generating components from the bus bar.

[0031] (5) In the above (3) or (4), preferably, at least one of the lower passage wall portion and the upper passage wall portion is constructed to include a sealing rubber receiving recess for receiving a sealing rubber, and the sealing rubber is compressed and in close contact with the sealing rubber receiving recess, thereby the lower passage wall portion and the upper passage wall portion are connected in a fluid-tight manner. The fluid-tight connection between the lower passage wall portion and the upper passage wall portion is reliably ensured by the sealing rubber received in the sealing rubber receiving recess, and the sealing rubber receiving recess is provided in at least one of the lower passage wall portion and the upper passage wall portion. Moreover, by receiving the sealing rubber in the sealing rubber receiving recess, the retention and positioning of the sealing rubber are ensured, and the assembly workability is also excellent.

[0032] (6) In any one of the above (1) to (5), preferably, a refrigerant input / output portion is protrudingly provided on the base member, one end of the refrigerant input / output portion is connected to the refrigerant flow path, and the other end is connected to an external refrigerant supply path. This is because a refrigerant such as radiator fluid that can be used in the vehicle can be easily supplied to the refrigerant flow path via the refrigerant input / output portion.

[0033] <Details of the embodiments of the present disclosure>

[0034] Specific examples of the circuit structure of the present disclosure are described below with reference to the drawings. In addition, the present disclosure is not limited to these examples, but is shown by the scope of the invention claims, and is intended to include all changes within the meaning and scope equivalent to the scope of the invention claims.

[0035] <Implementation Method 1>

[0036] Below, refer to Figure 1 to Figure 7 Embodiment 1 of the present disclosure will be described. The circuit structure 10 is mounted on a vehicle (not shown) such as an electric vehicle or a hybrid vehicle, and supplies and controls power from a power source 12 such as a battery to a load 14 such as a motor (see Figure 3). In addition, the circuit structure 10 can be arranged in any direction, but in the following description, the Z direction is upward, the Y direction is rightward in the longitudinal direction, and the X direction is forward in the width direction. In addition, sometimes, only some of the same components are marked with numbers, and the numbers are omitted for the other components.

[0037] <Schematic Circuit Structure of Circuit Structure 10>

[0038] like Figure 3 As shown, the circuit structure 10 includes a circuit structure 10a disposed on the positive electrode side and a circuit structure 10b disposed on the negative electrode side. The positive electrode side of the power supply 12 is connected to the input side of the circuit structure 10a, and the negative electrode side of the power supply 12 is connected to the input side of the circuit structure 10b. The positive electrode side of the load 14 is connected to the output side of the circuit structure 10a, and the negative electrode side of the load 14 is connected to the output side of the circuit structure 10b. A relay 16 as a heat generating component that connects the power supply 12 and the load 14 is connected between the input side and the output side of the circuit structure 10a and the circuit structure 10b, respectively. In addition, a pre-charging circuit 22 is connected to the relay 16 that connects the positive electrode side of the power supply 12 and the load 14, and the pre-charging resistor 18 and the pre-charging relay 20 of the pre-charging circuit 22 are connected in series in a manner of bypassing the relay 16. In addition, in Embodiment 1 of the present disclosure, as Figure 3 As shown, the pre-charging resistor 18 is connected to the input side of the pre-charging relay 20. In addition, the relay 16 connecting the negative side of the power supply 12 and the load 14 is also connected to the pre-charging circuit 22, but for easy understanding, in the embodiment 1 of the present disclosure, the illustration of the pre-charging circuit 22 connected to the relay 16 connecting the negative side of the power supply 12 and the load 14 is omitted. In addition, the relay 16 and the pre-charging relay 20 are relays that move the contact portion when the excitation coil is energized and switch the contact portion to on / off, and are controlled by the control circuit not shown in the figure for on / off. As described above, the circuit structure 10a and the circuit structure 10b have substantially the same structure.

[0039] <Circuit Structure 10>

[0040] For example, Figure 1 and Figure 6As shown, the circuit structure 10 includes a lower case 24 located at the bottom and an upper case 26 located at the top when mounted on a vehicle, and an insulating base member 28 is formed by the lower case 24 and the upper case 26. In the state where the lower case 24 and the upper case 26 are assembled, a bus bar 29 connecting the relay 16 to the pre-charge circuit 22 and a bus bar 30 connecting the inside of the pre-charge circuit 22 are accommodated therein. In addition, with respect to the base member 28 assembled with the lower case 24 and the upper case 26, two relays 16 and bus bars 34 and 36 connected to the connection parts 32a and 32b of the relay 16 are held.

[0041] <Lower housing 24>

[0042] The lower shell 24 is formed by injection molding an insulating synthetic resin into a predetermined shape. The synthetic resin constituting the lower shell 24 may contain fillers such as glass fiber. Figure 1 As shown, the lower housing 24 as a whole has a horizontally long flat block shape. Figure 1 As shown, threaded holes 37 with a rectangular cross-section and opening upward are respectively provided at the four corners of the lower housing 24 .

[0043] For example, Figure 1 As shown in FIG. 1 , the lower shell 24 is formed with grooves 38a and 38b extending along the periphery near the two peripheries in the width direction of the lower shell 24 and opening upward. The grooves 38a and 38b are connected at the center in the length direction by a connecting groove 40 extending in the width direction of the lower shell 24 and opening upward. The grooves 38a and 38b and the wall of the connecting groove 40 constitute a lower passage wall 42. In addition, on one side of the groove 38a in the length direction ( Figure 1 The dividing wall 44 is provided at the center of the groove 38a with a height dimension equal to the depth dimension of the groove 38a, and the groove 38a is divided into two parts by the dividing wall 44. The dividing wall 44 has a rectangular flat plate shape, and the end on one side in the length direction is connected to the wall of the groove 38a, and the other side in the length direction ( Figure 1 A recess 46 extending over the entire length in the vertical direction is formed at the end portion (left side in the figure). As described later, in order to form a refrigerant input and output portion 86 for installing two hoses for the inflow and outflow of refrigerant, the ends of the groove 38a divided into two strands are formed at different positions in the length direction. Moreover, a groove-shaped sealing rubber receiving recess 48 extending along the grooves 38a, 38b and the peripheral portion of the connecting groove 40 and opening upward is formed on the lower passage wall portion 42. The sealing rubber 50 made of rubber is received in the sealing rubber receiving recess 48.

[0044] In addition, for example, Figure 1 As shown, at four locations in the central part of the lower case 24, a square tube-shaped busbar fixing portion 52 is provided protruding upward to fasten the ends of the busbars 34 and 36 connected to the connection portions 32a and 32b of the relay 16 with bolts. A bolt insertion hole 54 with a rectangular cross-section shape opening upward is formed in the central portion of the protruding end surface of the busbar fixing portion 52. At six locations on the central side of the busbar fixing portion 52, a relay fixing portion 56 with a rectangular cross-section shape opening upward to fasten the leg portion 94 of the relay 16 described later with bolts is formed.

[0045] <Upper Shell 26>

[0046] The upper shell 26 is formed by injection molding an insulating synthetic resin into a predetermined shape. The synthetic resin constituting the upper shell 26 may contain fillers such as glass fiber. Figure 1 As shown, the upper housing 26 has a generally box-shaped opening upward, with a peripheral wall 60 protruding upward formed on the outer peripheral edge of a generally horizontally long rectangular flat plate-shaped upper wall 58. Bolt insertion holes 62 are formed at the four corners of the upper wall 58 of the upper housing 26 and penetrate the upper wall 58 in the plate thickness direction.

[0047] like Figure 1 As shown, the upper wall 58 of the upper shell 26 is provided with cover parts 64a, 64b in the shape of a groove opening downward, and the cover parts 64a, 64b cover the corresponding grooves 38a, 38b of the lower shell 24. In addition, the cover part covering the connecting groove 40 of the lower shell 24 is composed of an area A ( Figure 1 , 2 That is, the cover parts 64a, 64b and the area A of the upper wall 58 constitute the upper passage wall. Figure 2 As shown, the lower surfaces 66 of the covers 64a and 64b are provided with protruding portions 70a and 70b that protrude beyond the bottom surface 68 of the upper wall 58 of the upper housing 26. In the area A of the upper wall 58 of the upper housing 26, a protruding portion 76 is provided that protrudes from the bottom surface 68. The protruding portion 76 is formed at Figure 2 The two ends of the ferrule 70a and the ferrule 70b are connected integrally to the protrusions 70a and 70b. Figure 1 As shown, on the upper surfaces 72a, 72b of the cover parts 64a, 64b, slit-shaped bus bar receiving grooves 74a, 74b are formed in a manner that they are open on the upper surfaces 72a, 72b. In addition, the bus bar receiving grooves 74a, 74b are formed in the longitudinal direction ( Figure 1As described above, the upper passage wall portion is configured to include the cover portions 64a, 64b covering the lower passage wall portion 42 and the region A of the upper wall 58, and the protrusion portions 70a, 70b and the protrusion portion 76 protruding from the cover portions 64a, 64b and the region A.

[0048] In addition, for example, Figure 1 As shown, bus bar fixing portion opening windows 78 are provided through four locations in the central portion of the upper housing 26, and the bus bar fixing portion opening windows 78 allow the bus bar fixing portion 52 provided on the lower housing 24 to be exposed on the upper housing 26. In addition, six relay fixing portion opening windows 80 are provided through the upper housing 26, and the six relay fixing portion opening windows 80 allow the six relay fixing portions 56 provided on the lower housing 24 to be exposed on the upper housing 26. In addition, on one side ( Figure 1 The pre-charging resistor mounting portion 82 and the pre-charging relay mounting portion 84 for accommodating the pre-charging resistor 18 and the pre-charging relay 20 are provided with openings upward. Moreover, on the front side of the pre-charging relay mounting portion 84, a pair of refrigerant input and output portions 86, 86 for supplying refrigerant to the refrigerant flow passage 104 described later are formed. The pair of refrigerant input and output portions 86, 86 have a cylindrical shape open in the up-down direction, and are configured so that the refrigerant flows in and out through a hose (not shown) for supplying refrigerant installed in the upper opening portion via a metal hose joint 88.

[0049] <Relay 16>

[0050] The relay 16 is a mechanical relay, and is controlled to be turned on / off by a control circuit (not shown). Figure 1 , Figure 4 , Figure 5 As shown, the relay 16 includes a block-shaped relay body 90, a pair of annular connecting parts 32a, 32b, and a plurality of (three in this embodiment) legs 94. The relay body 90 has a contact part and a coil part (not shown) inside. On the front surface of the relay body 90, in the width direction ( Figure 1 , Figure 4 , Figure 5 A pair of connection parts 32a and 32b are arranged side by side on the left and right sides of the relay body 90. The pair of connection parts 32a and 32b generate heat by transferring heat generated at the contact parts when current flows between the pair of connection parts 32a and 32b via the contact parts of the relay body 90. Each connection part 32a and 32b has a bottomed cylindrical bolt insertion hole 92 extending toward the rear. The foot part 94 is respectively provided on one side in the width direction of the relay body 90 ( Figure 1 The side surface of the relay body 90 is formed with two flat plate-like protrusions facing outward, and the other side in the width direction of the relay body 90 ( Figure 1 The leg portion 94 has a bolt insertion hole 96 that penetrates in the up-down direction.

[0051] <Bus bars 34, 36>

[0052] The pair of bus bars 34 and 36 are formed by processing a conductive metal plate. Figure 1 As shown, each bus bar 34, 36 is formed in a U shape, and one end portion is a first connection portion 34a, 36a connected to the connection portion 32a, 32b of the relay 16, and has a bolt insertion hole 98 that penetrates in the plate thickness direction, that is, the front-back direction. The bus bars 34, 36 are electrically and thermally connected to the connection portions 32a, 32b of the relay 16 by bolt fastening with respect to the connection portions 32a, 32b of the relay 16. The other end portion of each bus bar 34, 36 extends in a straight line or L shape toward the rear, and a second connection portion 34b, 36b is formed at the extended end portion. The second connection portion 34b, 36b has a bolt insertion hole 100 that penetrates in the plate thickness direction, that is, the up-down direction. In addition, an extension portion 102 extending from the lower end portion of the first connection portion 34a, 36a in a direction away from each other is provided on a pair of bus bars 34, 36. In the first embodiment, of the pair of bus bars 34 and 36 , the bus bar 34 is connected to the connection portion 32 a on the positive electrode side of the relay 16 , and the bus bar 36 is connected to the connection portion 32 b on the negative electrode side of the relay 16 .

[0053] <Assembly Step of Circuit Structure 10>

[0054] Next, an example of an assembly process of the circuit structure 10 will be described. The assembly process of the circuit structure 10 is not limited to the following description.

[0055] First, prepare the lower shell 24 and the upper shell 26 constituting the base member 28. Next, the bus bar 29 connecting the relay 16 to the pre-charging circuit 22 and the bus bar 30 connecting the inside of the pre-charging circuit 22 are accommodated and configured relative to the lower shell 24 from above. Then, the sealing rubber 50 is accommodated and configured in the sealing rubber accommodation recess 48. Next, the upper shell 26 is placed from above relative to the lower shell 24 thus constructed, and is fastened to the threaded holes 37 of the lower shell 24 through the bolt insertion holes 62 of the upper shell 26 provided at the four corners using bolts not shown in the figure. Thus, the lower shell 24 and the upper shell 26 are assembled, and the insulation from other components outside the bus bars 29 and 30 is ensured.

[0056] After the lower case 24 and the upper case 26 are assembled, the legs 94 of the two relays 16 are placed on the relay fixing portion 56 exposed to the outside from the relay fixing portion opening window 80 of the upper case 26, and then fixed with bolts. Next, the bus bars 34 and 36 are respectively assembled to the two relays 16. More specifically, the first connection portions 34a and 36a of the bus bars 34 and 36 are respectively placed on the front side of the connection portions 32a and 32b of the relay 16. The second connection portions 34b and 36b of the bus bars 34 and 36 are respectively placed on the bus bar fixing portion 52 of the lower case 24 exposed to the outside from the bus bar fixing portion opening window 78. At the same time, the extension portions 102 of the bus bars 34 and 36 are respectively pressed into the bus bar receiving groove portions 74a and 74b provided on the cover portions 64a and 64b of the upper case 26. Finally, the first connection parts 34a and 36a of the busbars 34 and 36 are respectively fastened to the connection parts 32a and 32b of the relay 16 by bolts to be thermally and electrically connected. Thus, the second connection parts 34b and 36b of the busbars 34 and 36 are respectively fastened to the busbar fixing part 52 of the lower case 24 together with the busbar 29, thereby completing the circuit structure 10 of the present embodiment. The circuit structure 10 of the present embodiment configured in this way is arranged at a predetermined position of the vehicle, and is used in a state where a hose for supplying refrigerant is attached to a pair of refrigerant input and output parts 86 and 86 of the upper case 26 via a hose joint 88. That is, one end of each of the pair of refrigerant input and output parts 86 and 86 is connected to the refrigerant flow path 104 described later, and the other end is connected to an external refrigerant supply path not shown. In the present embodiment, by using a refrigerant that can be used in the vehicle, such as radiator fluid, the refrigerant can be easily supplied to the refrigerant flow path 104 via the pair of refrigerant input and output parts 86 and 86.

[0057] In the circuit structure 10 assembled in this way, for example, Figure 1 , Figure 5 , Figure 6As shown, with respect to the lower passage wall portion 42 formed by the wall portions of the grooves 38a, 38b and the wall portions connecting the grooves 40, the cover portions 64a, 64b of the upper shell 26 and the upper wall 58 constituting the upper passage wall portion are assembled from above and covered. At this time, the sealing rubber 50 accommodated in the sealing rubber accommodation recess 48 is compressed and in close contact with the sealing rubber accommodation recess 48 and the upper wall 58 of the upper shell 26, thereby, the lower passage wall portion 42 and the cover portions 64a, 64b of the upper shell 26 constituting the upper passage wall portion are connected in a fluid-tight manner. The refrigerant flow passage 104 is composed of the lower passage wall portion 42 and the cover portions 64a, 64b constituting the upper passage wall portion connected in a fluid-tight manner. The upper passage wall portion also includes protrusions 70a, 70b protruding from the cover portions 64a, 64b of the upper shell 26. The protrusions 70a and 70b protrude into the grooves 38a and 38b divided by the lower passage wall 42 and through which the refrigerant flows, and the protrusion ends abut against the bottom surfaces of the grooves 38a and 38b, thereby dividing the refrigerant flow passage 104 into two in the width direction. On the other hand, the lower passage wall 42 composed of the wall portion of the connecting groove 40 connecting the grooves 38a and 38b is also assembled from above and covers the area A of the upper wall 58 of the upper shell 26. In this case, the sealing rubber 50 accommodated in the sealing rubber accommodation recess 48 is compressed and closely contacts the sealing rubber accommodation recess 48 and the area A of the upper wall 58 of the upper shell 26, thereby the lower passage wall 42 and the area A of the upper wall 58 of the upper shell 26 are connected in a fluid-tight manner. The refrigerant flow passage connection portion 106 is composed of the lower passage wall 42 and the area A of the upper wall 58 of the upper shell 26 connected in a fluid-tight manner.

[0058] The protruding portion 76 protrudingly provided in the area A of the upper wall 58 of the upper shell 26 protrudes into the connecting groove 40 divided by the lower passage wall 42 and through which the refrigerant flows, and the protruding end abuts against the bottom surface of the connecting groove 40, thereby dividing the refrigerant flow passage connecting portion 106 into two in the left-right direction (see Figure 6 ). The above results in, for example, Figure 7As shown, a refrigerant flow path 108 is formed by the refrigerant flow path 104 and the refrigerant flow path connecting portion 106 which are divided into two parts, so that the refrigerant flowing in from one of the pair of refrigerant input and output parts 86, 86 flows out from the other of the pair of refrigerant input and output parts 86, 86. As a result, the refrigerant flows without stagnation, so that the refrigerant flow path 104 and the base member 28 near the refrigerant flow path connecting portion 106 can be efficiently cooled by the refrigerant. In this way, the circuit structure 10 has the refrigerant flow path 104 and the refrigerant flow path connecting portion 106 for the refrigerant to flow inside the base member 28. In addition, the extension portion 102 of the bus bar 34, 36 pressed into the bus bar receiving groove portion 74a, 74b of the protruding portion 70a, 70b is in thermal contact with the refrigerant flow path 104 via the protruding portion 70a, 70b, thereby also being able to efficiently cool the bus bar 34, 36. Here, for easy understanding, the refrigerant flow path 108 is shown by an imaginary line.

[0059] According to the circuit structure 10 of the present disclosure formed into such a structure, a refrigerant flow path 104 for refrigerant to flow is provided inside the base member 28. The extension portions 102 of the bus bars 34 and 36 are pressed into the bus bar receiving groove portions 74a and 74b of the protruding portions 70a and 70b protruding into the grooves 38a and 38b constituting the refrigerant flow path 104, and the bus bars 34 and 36 are in thermal contact with the refrigerant flow path 104 via the protruding portions 70a and 70b. As a result, the extension portions 102 of the bus bars 34 and 36 that transfer the heat of the relay 16, which is a heat generating component, via a pair of connecting portions 32a and 32b can be made to be in thermal contact with the refrigerant flow path 104 via the protruding portions 70a and 70b and efficiently cooled. Therefore, compared with the existing structure, the heat dissipation of the relay 16, which is a heat generating component, can be more reliably promoted with a short heat transfer path, so that the heat dissipation performance of the circuit structure 10 itself can be improved. Furthermore, since bus bars 34 and 36 are cooled by the refrigerant flowing through refrigerant flow path 104, heat dissipation and cooling effects can be improved compared to the conventional structure in which the chassis or the housing itself in thermal contact with bus bars 34 and 36 reaches a high temperature exceeding 70°C.

[0060] In addition, since the extension portions 102 of the bus bars 34 and 36 are pressed into and fixed to the bus bar receiving groove portions 74a and 74b of the protruding portions 70a and 70b, the bus bars 34 and 36 can be more reliably and stably brought into thermal contact with the refrigerant flow path 104. Therefore, the heat dissipation performance of the circuit structure 10 of the present disclosure can be advantageously improved. Moreover, by accommodating the sealing rubber 50 in the sealing rubber receiving recess 48 provided in the lower passage wall portion 42 and compressing the sealing rubber 50 using the cover portions 64a and 64b and the region A constituting the upper passage wall portion, the lower passage wall portion 42 and the upper passage wall portion can be connected in a fluid-tight manner with good space efficiency. Moreover, by accommodating the sealing rubber 50 in the sealing rubber receiving recess 48, the retention and positioning of the sealing rubber 50 are ensured, and the assembly workability is also excellent.

[0061] <Other Implementation Methods>

[0062] The technology described in this specification is not limited to the embodiments illustrated in the above description and drawings. For example, the following embodiments are also included in the technical scope of the technology described in this specification.

[0063] (1) In the above embodiment, the extension portions 102 of the bus bars 34 and 36 are pressed into the bus bar receiving groove portions 74a and 74b of the protruding portions 70a and 70b that protrude into the recessed grooves 38a and 38b constituting the refrigerant flow passage 104, so that the bus bars 34 and 36 are in thermal contact with the refrigerant flow passage 104 via the protruding portions 70a and 70b, but the present invention is not limited thereto. The thermal contact between the bus bars 34 and 36 and the refrigerant flow passage 104 may be achieved by arranging the bus bars 34 and 36 around the refrigerant flow passage 104, or by making the bus bars 34 and 36 contact with the lower passage wall portion 42 and the cover portions 64a and 64b constituting the refrigerant flow passage 104, etc.

[0064] (2) In the above embodiment, for example, the bus bars 34 and 36 are used as conductive members, but the present invention is not limited thereto and the bus bars may be used only for heat dissipation as long as they are connected to the connection portion of the heat generating component.

[0065] (3) In the above embodiment, the extension portions 102 of the bus bars 34 and 36 are pressed into the bus bar receiving groove portions 74a and 74b of the protruding portions 70a and 70b that protrude into the recessed grooves 38a and 38b that constitute the refrigerant flow passage 104, but the present invention is not limited thereto. Parts of the bus bars 34 and 36 may be embedded in the lower passage wall portion 42 and the cover portions 64a and 64b that constitute the upper passage wall portion by insert molding or the like.

[0066] (4) In the circuit structure 10 of the present disclosure, the lower passage wall 42 and the cover portions 64a and 64b constituting the upper passage wall are all in the shape of a groove, but the present invention is not limited thereto. Like the refrigerant flow passage connecting portion 106, the upper passage wall may also be constituted by the region A of the flat upper wall 58, and the shapes of the lower passage wall, the upper passage wall, and the refrigerant flow passage may be arbitrarily set.

[0067] (5) In the circuit structure 10 of the present disclosure, the sealing rubber housing recess 48 is provided on the lower case 24 side, but the present invention is not limited thereto and may be provided on the upper case 26 side or may be provided on both the lower case 24 and the upper case 26 .

[0068] Description of symbols

[0069] 10. Circuit structure;

[0070] 10a Circuit structure;

[0071] 10b circuit structure;

[0072] 12 Power supply;

[0073] 14 Load;

[0074] 16 relays (heat generating components);

[0075] 18 Pre-charge resistor;

[0076] 20 Pre-charge relay;

[0077] 22 pre-charge circuit;

[0078] 24 lower housing;

[0079] 26 upper housing;

[0080] 28 base member;

[0081] 29 busbars;

[0082] 30 busbars;

[0083] 32a, 32b connecting portion;

[0084] 34 busbars;

[0085] 34a a first connecting portion;

[0086] 34b a second connecting portion;

[0087] 36 busbars;

[0088] 36a a first connecting portion;

[0089] 36b a second connecting portion;

[0090] 37 threaded holes;

[0091] 38a, 38b grooves;

[0092] 40 connecting groove;

[0093] 42 lower passage wall;

[0094] 44 dividing wall portion;

[0095] 46 recess;

[0096] 48 sealing rubber receiving recess;

[0097] 50 Sealing rubber;

[0098] 52 bus bar fixing portion;

[0099] 54 bolt insertion hole;

[0100] 56 relay fixing part;

[0101] 58 upper wall;

[0102] 60 perimeter wall;

[0103] 62 bolt insertion holes;

[0104] 64a, 64b cover portion;

[0105] 66 lower surface;

[0106] 68 Bottom;

[0107] 70a, 70b protrusions;

[0108] 72a, 72b upper surface;

[0109] 74a, 74b bus bar receiving grooves;

[0110] 76 protrusion;

[0111] 78 busbar fixing portion opening window;

[0112] 80 Opening window of relay fixing part;

[0113] 82 pre-charge resistor installation part;

[0114] 84 Pre-charge relay installation part;

[0115] 86 refrigerant input and output part;

[0116] 88 Hose connector;

[0117] 90 relay body;

[0118] 92 bolt insertion holes;

[0119] 94 feet;

[0120] 96 bolt insertion holes;

[0121] 98 bolt insertion holes;

[0122] 100 Bolt through hole;

[0123] 102 extension;

[0124] 104 refrigerant flow path;

[0125] 106 refrigerant flow path connection portion;

[0126] 108 Refrigerant flow path.

Claims

1. A circuit structure, comprising: Heat generating components; A bus bar connected to the connecting portion of the heat generating component; An insulating base member for holding the heat generating component and the bus bar; and A refrigerant flow passage is provided inside the base member and allows the refrigerant to flow. The bus bar is in thermal contact with the refrigerant flow path, The base member has a passage wall portion constituting the refrigerant flow passage, and a portion of the bus bar is pressed into the passage wall portion, whereby the bus bar is in thermal contact with the refrigerant flow passage. The base member includes a lower shell and an upper shell, the lower shell includes a lower passage wall portion, the upper shell includes an upper passage wall portion connected to the lower passage wall portion in a fluid-tight manner, and the refrigerant flow path is composed of the lower passage wall portion and the upper passage wall portion connected in a fluid-tight manner. The upper passage wall portion includes a cover portion and a protrusion portion, wherein the cover portion covers the lower passage wall portion, the protrusion portion protrudes from the cover portion and protrudes into a groove divided by the lower passage wall portion and through which the refrigerant flows, and a portion of the bus bar is pressed into the protrusion portion.

2. The circuit structure according to claim 1, wherein: At least one of the lower passage wall and the upper passage wall includes a sealing rubber receiving recess for receiving a sealing rubber, and the sealing rubber is compressed and in close contact with the sealing rubber receiving recess, whereby the lower passage wall and the upper passage wall are connected in a fluid-tight manner.

3. The circuit structure according to claim 1 or 2, wherein: A refrigerant input / output portion is protrudingly provided on the base member, one end of the refrigerant input / output portion is connected to the refrigerant flow path, and the other end of the refrigerant input / output portion is connected to an external refrigerant supply path.

Images