electrical junction box

Abstract

The electric junction box (10) comprises: an insulating housing (11); a relay (12) mounted on the housing (11); a bus bar (13) connected to a terminal (12a) of the relay (12); and a first heat dissipation component (51) connected to the relay (12) in a heat transfer manner, wherein the housing (11) comprises a first housing component (21) and a second housing component (22) connected to the first housing component (21) and forming a receiving space (27) between the first housing component (21) and the second housing component (22), the first heat dissipation component (51) having a first stacking portion (56) stacked on the first housing component (21) in the receiving space (27), and the bus bar (13) having a second stacking portion (15) stacked on the first housing component (21) and the first stacking portion (56) outside the housing (11).

Description

Technical Field

[0001] The present disclosure relates to an electrical junction box. Background Art

[0002] For example, in an automobile, to supply power from a battery to multiple onboard devices, wires from the battery are temporarily connected to an electrical junction box (also called a "junction box"), and wires are connected from the electrical junction box to each onboard device (see, for example, Patent Document 1).

[0003] The electrical junction box described in Patent Document 1 is housed within a battery case and comprises a device cover having an upper cover member and a lower cover member; a relay housed within the device cover; and a bus bar connected to the relay terminals. One end of the bus bar is connected to the relay terminals, while the other end is connected to connector terminals mounted on the device cover. These connector terminals are then connected to other devices such as the battery via electrical wires.

[0004] Relays generate heat due to the repeated opening and closing of their contacts. Therefore, in this type of electrical junction box, heat dissipation to the outside of the device cover is necessary. In the electrical junction box described in Patent Document 1, heat sinks are provided between the intermediate portion between one end of the busbar and the other end and the lower cover member, as well as between the lower cover member and the battery case. The busbar, one heat sink, the lower cover member, and the other heat sink are stacked one above the other. Furthermore, heat transferred from the relay terminals to the busbar is transferred to the battery case via the two heat sinks and the lower cover member, where it is dissipated.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-93713 Summary of the Invention

[0008] Problems to be solved by the invention

[0009] In the technology described in Patent Document 1, since the busbar is used for heat dissipation, the middle portion of the busbar must be located near the lower cover member, resulting in a complex and larger busbar structure. Furthermore, in recent years, heat generation from relays has tended to increase in electric and hybrid vehicles, leading to a demand for an electrical junction box with improved heat dissipation.

[0010] An object of the present disclosure is to provide an electrical junction box capable of efficiently dissipating heat from a relay without increasing the complexity and size of a bus bar.

[0011] Technical solutions to problems

[0012] The electrical junction box of the present disclosure comprises:

[0013] case;

[0014] a relay, mounted on the housing;

[0015] a bus bar connected to the terminals of the relay; and

[0016] A first heat dissipation component is connected to the relay in a heat transfer manner.

[0017] The housing includes a first housing member and a second housing member, wherein the second housing member is connected to the first housing member and forms a housing space between the second housing member and the first housing member.

[0018] The first heat dissipating component has a first stacking portion stacked on the first housing component in the accommodation space.

[0019] The bus bar includes a second laminated portion laminated on the first case member and the first laminated portion outside the case.

[0020] Effects of the Invention

[0021] According to the electrical junction box of the present disclosure, heat of the relay can be efficiently dissipated without increasing the size and complexity of the bus bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view of an electrical junction box according to the embodiment.

[0023] Figure 2 It is a plan view of the electrical junction box according to the embodiment.

[0024] Figure 3 This is a front view showing the relays and bus bars of the electrical junction box.

[0025] Figure 4 This is a perspective view of a portion of the lower casing member of the casing as viewed from an oblique upper side.

[0026] Figure 5 This is a perspective view of a portion of the upper casing member of the casing as viewed from an oblique upper side.

[0027] Figure 6 This is a perspective view of a portion of the upper casing member of the casing as viewed obliquely from below.

[0028] Figure 7 yes Figure 2 AA line section view.

[0029] Figure 8 yes Figure 2 BB line cross-sectional view.

[0030] Figure 9 It is a perspective view showing the components of the bus bar and the heat dissipation structure.

[0031] Figure 10 This is an exploded perspective view showing the components of the bus bar and heat dissipation structure.

[0032] Figure 11 yes Figure 2 CC line cross-sectional view.

[0033] Figure 12 yes Figure 8 Enlarged view of part D. DETAILED DESCRIPTION

[0034] [Summary of Embodiments of the Present Disclosure]

[0035] The embodiments of the present disclosure include at least the following as their gist.

[0036] (1) An electrical junction box according to an embodiment includes:

[0037] case;

[0038] a relay, mounted on the housing;

[0039] a bus bar connected to the terminals of the relay; and

[0040] A first heat dissipation component is connected to the relay in a heat transfer manner.

[0041] The housing includes a first housing member and a second housing member, wherein the second housing member is connected to the first housing member and forms a housing space between the second housing member and the first housing member.

[0042] The first heat dissipating component has a first stacking portion stacked on the first housing component in the accommodation space.

[0043] The bus bar includes a second laminated portion laminated on the first case member and the first laminated portion outside the case.

[0044] The electrical junction box structured as described above includes a first heat sink connected to the relay in a heat-transferable manner. Therefore, heat generated by the relay can be transferred not only to the busbar but also to the first heat sink, dissipating heat externally from the first heat sink. Consequently, the busbar can be made less complex and larger for heat dissipation. Because the second laminated portion of the busbar, the first housing member of the housing, and the first laminated portion of the first heat sink are stacked, the first housing member can be used to separate the power supply path on the busbar side from the heat dissipation path on the first heat sink side.

[0045] (2) Preferably, the electrical junction box further includes a second heat dissipating member in the housing space, the second heat dissipating member being disposed between the first stacking portion and the second case member and stacked on the first stacking portion and the second case member.

[0046] This structure allows heat from the relay to be transferred to the first heat sink, the second heat sink, and the second housing member, dissipating it from the second housing member to the outside, thereby suppressing heat transfer to the busbar. Furthermore, by sandwiching the first laminated portion of the first heat sink and the second heat sink between the first and second housing members, the first and second heat sinks are brought into close contact, enabling efficient heat transfer between the first and second heat sinks.

[0047] (3) Preferably, the first heat dissipation member is made of metal, and the second heat dissipation member is made of synthetic resin.

[0048] According to this configuration, the first laminated portion of the metal first heat dissipating member can compress the synthetic resin second heat dissipating member, thereby bringing the two members into close and firm contact with each other.

[0049] (4) Preferably, a protrusion that resists bending deformation is formed on the first shell member or the second shell member.

[0050] According to this structure, when the first stacked portion of the first heat dissipation component and the second heat dissipation component are sandwiched between the first shell component and the second shell component, the bending deformation of the first shell component or the second shell component is suppressed by the protrusion, and the first stacked portion and the second heat dissipation component can be reliably and evenly adhered to each other.

[0051] (5) Preferably, the protrusion is formed on a surface of the first case member on the first stacking portion side.

[0052] According to this structure, the ridges suppress bending deformation of the first housing member. By making the ridges of the first housing member contact the first laminated portion of the first heat dissipating member, the contact area between the two can be reduced, thereby suppressing heat transfer from the first heat dissipating member to the first housing member.

[0053] (6) Preferably, the shell has a protrusion, which protrudes in a second direction perpendicular to the first direction, the first direction is the stacking direction of the first stacking part and the second stacking part, the first stacking part and the second heat dissipation part of the first heat dissipation part are arranged on the protrusion, and the protrusion extends along the second direction.

[0054] According to this configuration, the front end side of the protrusion of the housing in the second direction is easily bent and deformed in the first direction. Therefore, by extending the ridge in the second direction, the bending deformation of the protrusion can be effectively suppressed.

[0055] (7) Preferably, the first heat dissipation component is connected to a terminal of the relay.

[0056] According to this configuration, heat generated at the contacts inside the relay can be efficiently transferred to the first heat dissipating member via the terminals.

[0057] (8) Preferably, the first heat dissipating member and the bus bar overlap at positions of terminals of the relay.

[0058] According to this configuration, a voltage can be applied from the terminal of the relay to the bus bar, and heat can be transferred from the terminal of the relay to the first heat dissipating member.

[0059] [Details of the embodiments of the present disclosure]

[0060] Hereinafter, details of the embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0061] [Overall structure of the electrical junction box]

[0062] Figure 1 It is a perspective view of an electrical junction box according to the embodiment. Figure 2 : is a top view of the electrical junction box according to the embodiment. In the following description, the descriptions of up, down, front, back, left and right follow the arrows shown in the drawings. For example, Figure 1 , among the mutually orthogonal arrows X, Y, and Z, the direction indicated by the arrow X (the third direction) is the left-right direction, the direction indicated by the arrow Y (the second direction) is the front-back direction, and the direction indicated by the arrow Z (the first direction) is the up-down direction. However, these descriptions are merely examples, and for example, the direction X may be replaced by the front-back direction or the up-down direction, the direction Y may be replaced by the left-right direction or the up-down direction, and the direction Z may be replaced by the front-back direction or the left-right direction.

[0063] The electrical junction box 10 is a component that connects the battery of a vehicle to a plurality of in-vehicle devices. The electrical junction box 10 is also called a junction box (JB). The electrical junction box 10 includes a housing 11, a relay 12, and a bus bar 13.

[0064] The shell 11 has concave and convex portions on the upper surface, but is generally formed into a box shape that is flat in the up-down direction Z. The shell 11 is formed into a roughly rectangular shape when viewed from above. In this embodiment, the long side L1 of the shell 11 is arranged along the left-right direction X, and the short side L2 is arranged along the front-to-back direction. Protrusions 25 that protrude in the front-to-back direction Y are provided on the front and rear surfaces of the shell 11. Boss portions 11a are provided at the four corners of the shell 11 and in the middle of the long side L1. The boss portion 11a is used to mount the shell 11 on a mounted component 100 such as a chassis of a vehicle or a battery box (see Figure 7 ).

[0065] The relay 12 is electrically connected between the battery and the vehicle-mounted device, and is a component that controls the on / off switching of the electrical signal from the battery to the vehicle-mounted device. The relay 12 is, for example, a mechanical relay, which contains a coil, a spring, etc. The relay 12 is mounted on the upper surface side of the housing 11, with the upper side exposed. In this embodiment, as shown in FIG. Figure 2 As shown, two relays 12 are mounted on the housing 11. Specifically, the two relays 12 are arranged side by side in the left-right direction X. The relay 12 on the left side has two terminals 12a on its front end. The relay 12 on the right side has two terminals 12a on its rear end. In each relay 12, the two terminals 12a are arranged side by side in the left-right direction X. The number of relays 12 mounted on the housing 11 is not particularly limited and can be one or three or more.

[0066] The relay 12 of this embodiment is a high-voltage relay capable of operating at a voltage higher than a typical voltage (e.g., 12V, 24V, etc.) (e.g., 30V or higher). The relay 12 is susceptible to high temperatures due to the application of high voltage. Therefore, the electrical junction box 10 includes a heat dissipation structure 50, described below.

[0067] Figure 3 This is a front view showing the relays and busbars of the electrical junction box. In particular, Figure 3 express Figure 2 The relay 12 and bus bar 13 on the left side.

[0068] like Figures 1 to 3 As shown, bus bar 13 is a conductive component with one end 14 electrically connected to relay 12 and the other end 15 electrically connected to other onboard equipment or the battery. Bus bar 13 is formed of a metal such as copper, a copper alloy, aluminum, or an aluminum alloy. When relay 12 is turned on, current flows through bus bar 13.

[0069] One bus bar 13 is attached to each of the two terminals 12a of the relay 12. The bus bar 13 is formed by bending a strip into an L shape. The bus bar 13 includes a first piece 14 and a second piece 15 that are orthogonal to each other. The first piece 14 is connected to the relay 12, and the second piece 15 is connected to other equipment. The first piece 14 is formed with a connection hole 14a for connecting to the relay 12 (see Figure 8 The second sheet 15 is provided with a connection hole 15a for connecting an electric wire to other devices.

[0070] Figure 8 yes Figure 2 BB line cross-sectional view.

[0071] One end portion (first piece 14) of busbar 13 is attached to terminal 12a of relay 12 via connecting member 16. In this embodiment, connecting member 16 is a screw. Connecting member 16 is inserted into connecting hole 14a of first piece 14 of busbar 13 and then attached to internally threaded hole 12b provided in terminal 12a of relay 12. Connecting member 16 is also used to attach heat sink (first heat sink) 51, described later, to terminal 12a of relay 12. In other words, connecting member 16 secures both busbar 13 and heat sink 51 to terminal 12a of relay 12.

[0072] like Figure 3 As shown, the second pieces 15 of the bus bars 13 arranged side by side have different heights in the vertical direction Z. Specifically, the second piece 15 of the right bus bar 13 is arranged at a higher position than the second piece 15 of the left bus bar 13.

[0073] [Structure of the housing]

[0074] Figure 4 This is a perspective view of a portion of the lower casing member of the casing as viewed from an oblique upper side. Figure 5 This is a perspective view of a portion of the upper casing member of the casing as viewed from an oblique upper side. Figure 6 This is a perspective view of a portion of the upper casing member of the casing as viewed obliquely from below. Figures 4 to 6 Show Figure 2 The shape of the housing 11 around the relay 12 and bus bar 13 on the left side of the figure. The structure of the housing 11 near the relay 12 and bus bar 13 will be described below.

[0075] The housing 11 is formed of an insulating material, for example, a synthetic resin material such as polypropylene containing glass fiber or talc. The housing 11 includes an upper housing member (first housing member) 21 and a lower housing member (second housing member) 22 .

[0076] like Figure 5 As shown, the upper housing member 21 includes a top plate 21a and an outer peripheral wall 21b provided on the outer periphery of the top plate 21a. A relay base 23 and a busbar base 24 are formed on the upper surface of the top plate 21a. The relay 12 is fixed to the relay base 23 in a mounted state. The second piece 15 of the busbar 13 is arranged on the busbar base 24 (see FIG. 2 ). Figure 3 The first piece 14 of the bus bar 13 is connected to the terminal 12a of the relay 12 fixed to the relay base 23. The upper surface of the protruding portion 25 of the housing 11 serves as the bus bar base 24.

[0077] like Figure 6As shown, a plurality of protrusions 44 and positioning protrusions (positioning portions) 45 are provided on the lower surface of the top plate 21a of the upper housing member 21. The plurality of protrusions 44 extend in the front-to-back direction Y and are arranged side by side in the left-to-right direction X. The plurality of protrusions 44 function as ribs to increase the rigidity of the upper housing member 21 against bending deformation.

[0078] Positioning protrusions 45 extend downward from the lower surface of top plate 21a. Positioning protrusions 45 are cylindrical in shape. Positioning protrusions 45 are used to position the various components that make up heat dissipation structure 50 (described later) relative to housing 11. The specific functions of protrusions 44 and positioning protrusions 45 will be described later.

[0079] like Figure 4 As shown, the lower shell member 22 has a bottom plate 22a and an outer peripheral wall 22b provided on the outer periphery of the bottom plate 22a. A sheet stage 58 is provided on the bottom plate 22a. The sheet stage 58 is formed into a rectangular shape when viewed from above. Figure 8 As shown, the bottom plate 22a of the lower housing member 22 is formed so that the portion of the tablet table 58 is slightly offset upward. Therefore, the upper surface 58a of the tablet table 58 protrudes upward from the upper surface of the bottom plate 22a surrounding it. The lower surface 58b of the tablet table 58 is recessed upward from the lower surface of the bottom plate 22a surrounding it.

[0080] Upper heat sinks (second heat sink components) 52 of the heat dissipation structure 50, described later, are located on the upper surface 58a of the wafer stage 58. Lower heat sinks (third heat sink components) 53 of the heat dissipation structure 50 are located on the lower surface 58b of the wafer stage 58. A protrusion 58c extending in the front-back direction Y is formed at the center of the upper surface 58a of the wafer stage 58 in the left-right direction X.

[0081] like Figure 2 As shown, the housing 11 has a plurality of connection portions 28 to 31 connecting the upper housing member 21 and the lower housing member 22. The first to fourth connection portions 28 to 31 near the two bus bars 13 connected to the left relay 12 will be described below.

[0082] The first connecting portion 28 connects the upper housing member 21 and the lower housing member 22 at the top end of the protrusion 25 of the housing 11. The second connecting portion 29 connects the upper housing member 21 and the lower housing member 22 at a position spaced apart from the first connecting portion 28 in the front-to-back direction Y. The second connecting portion 29 is arranged inward of the outer periphery of the housing 11. The third connecting portion 30 and the fourth connecting portion 31 connect the upper housing member 21 and the lower housing member 22 on both sides of the protrusion 25 in the left-right direction X.

[0083] The first connecting portion 28, the third connecting portion 30, and the fourth connecting portion 31 have the same structure, but are oriented in different directions. Therefore, the structure of the first connecting portion 28 will be described below as a representative.

[0084] like Figure 3 As shown, the first connection portion 28 includes an engaging portion 34 provided on the upper housing member 21 and an engaged portion 35 provided on the lower housing member 22 .

[0085] Also like Figure 5 and Figure 6 As shown in FIG. 1 , the engagement portion 34 is formed in a substantially U-shape in a front view. The engagement portion 34 has a claw receiving portion 34 a extending in the left-right direction X at its lower end.

[0086] Also like Figure 4 As shown, the engaged portion 35 includes a claw portion 35a that protrudes outward from the outer peripheral wall 22b of the lower housing member 22. The claw portion 35a engages with the claw receiving portion 34a from the upper side. This engagement connects the upper housing member 21 and the lower housing member 22 so that they cannot be separated in the vertical direction Z.

[0087] The third connection part 30 is provided on the left side of the protrusion 25 and has a structure that rotates the first connection part 28 90 degrees to the left. The fourth connection part 31 is provided on the right side of the protrusion 25 and has a structure that rotates the first connection part 28 90 degrees to the right.

[0088] like Figure 2 As shown, the second connecting portion 29 is arranged at two locations on the left and right corresponding to the two bus bars 13. Figure 8 As shown, the second connection portion 29 includes an engaging portion 37 provided on the upper housing member 21 and an engaged portion 38 provided on the lower housing member 22. Figure 6 As shown in FIG. 1 , the engaging portion 37 protrudes downward from the lower surface of the top plate 21a of the upper housing member 21. The engaging portion 37 is plate-shaped and is arranged perpendicularly to the front-rear direction Y. Figure 4 As shown, the engaged portion 38 protrudes upward from the bottom plate 22 a of the lower case member 22 .

[0089] Figure 12 yes Figure 8 Enlarged view of part D.

[0090] A rearwardly curved hook portion 37a is formed at the lower end of the engaging portion 37. A forwardly curved hook portion 38a is formed at the upper end of the engaged portion 38. The hook portion 37a of the engaging portion 37 and the hook portion 38a of the engaged portion 38 engage in the vertical direction Z. The engaging portion 37 is inserted into an opening 41 formed in the bottom plate 22a of the lower housing member 22. The engaged portion 38 is inserted into an opening 40 formed in the upper housing member 21. The engaging portion 37 is formed at the front edge of the opening 40, and the engaged portion 38 is formed at the rear edge of the opening 41.

[0091] The upper surface 37b of the hook portion 37a on the engaging portion 37 and the lower surface 38b of the hook portion 38a on the engaged portion 38 respectively form engaging surfaces. The two engaging surfaces 37b and 38b contact each other vertically. The two engaging surfaces 37b and 38b are inclined so that they are lower in the front and higher in the back. Therefore, for example, when the engaging portion 37 and the engaged portion 38 are engaged, if a force is applied to the upper housing member 21 and the lower housing member 22 to cause them to move apart vertically, the inclination of the engaging surfaces 37b and 38b pulls the engaging portion 37 and the engaged portion 38 toward each other. As a result, the engaging portion 37 and the engaged portion 38 are more firmly engaged, maintaining the connection between the upper housing member 21 and the lower housing member 22.

[0092] [Composition of heat dissipation structure]

[0093] Figure 7 yes Figure 2 AA line section view. Figure 9 It is a perspective view showing the components of the bus bar and the heat dissipation structure. Figure 10 This is an exploded perspective view showing the components of the bus bar and heat dissipation structure.

[0094] like Figure 7 and Figure 8 As shown, the heat dissipation structure 50 includes a heat dissipation plate (first heat dissipation component) 51, an upper heat dissipation fin (second heat dissipation component) 52, and a lower heat dissipation fin (third heat dissipation component) 53. Figure 10 As shown, two heat sinks 51 and two upper heat sinks 52 are provided corresponding to two bus bars 13. One lower heat sink 53 is provided corresponding to the two heat sinks 51 and two upper heat sinks 52 arranged side by side. Figure 7 and Figure 8 As shown, the lower portion of the heat dissipation plate 51 and the upper heat dissipation fins 52 are disposed in the accommodation space 27 formed between the upper housing member 21 and the lower housing member 22 .

[0095] The heat sink 51 is made of metal. Specifically, it is formed from the same material as the busbar 13, such as copper, a copper alloy, aluminum, or an aluminum alloy. The heat sink 51 is formed by bending a single strip into an L-shape. The heat sink 51 includes a first piece 55 and a second piece 56 that are orthogonal to each other.

[0096] like Figure 8 As shown, the first piece 55 of the heat sink 51 is attached to the terminal 12a of the relay 12 via the connecting member 16. Specifically, a connecting hole 55a is formed through the first piece 55, into which the connecting member 16 is inserted. The first piece 55 of the heat sink 51 overlaps the first piece 14 of the bus bar 13. The first piece 55 of the heat sink 51 is positioned between the first piece 14 of the bus bar 13 and the relay 12. Heat generated in the relay 12 is transferred from the terminal 12a to both the heat sink 51 and the bus bar 13.

[0097] The lower end of the first piece 55 of the heat dissipation plate 51 is disposed in the housing 11 through the slit 26 formed in the top plate 21 a of the upper housing member 21 .

[0098] The second piece 56 of the heat sink 51 is positioned below the second piece 15 of the bus bar 13. The top plate 21a of the upper housing member 21 is positioned between the second piece 56 of the heat sink 51 and the second piece 15 of the bus bar 13. Thus, the second piece 15 of the bus bar 13, the top plate 21a of the upper housing member 21, and the second piece 56 of the heat sink 51 are stacked in this order from top to bottom. The second piece 56 of the heat sink 51 constitutes a first stacked portion stacked on the top plate 21a of the upper housing member 21. The second piece 15 of the bus bar 13 constitutes a second stacked portion stacked on the top plate 21a of the upper housing member 21 and the first stacked portion 56.

[0099] like Figure 7 As shown, a plurality of protrusions 44 are formed on the lower surface of the top plate 21 a of the upper case member 21 , and the lower ends of the protrusions 44 are in contact with the upper surface of the second piece 56 of the heat sink 51 .

[0100] like Figure 7 and Figure 8 As shown, the upper heat sink 52 is stacked on the lower side of the second sheet 56 of the heat sink 51. Figure 10 As shown, the upper heat sink 52 is a sheet material formed into a rectangular shape when viewed from above. It is made of a thermally conductive synthetic resin, such as acrylic, other acrylic-based materials, or silicone-based materials. The upper heat sink 52 is bonded to the lower surface of the second sheet 56 of the heat sink 51. The upper heat sink 52 is placed on the sheet base 58 of the lower housing member 22. Thus, the upper heat sink 52 is sandwiched between the second sheet 56 of the heat sink 51 and the sheet base 58 of the lower housing member 22.

[0101] As described above, when the upper housing member 21 and the lower housing member 22 are connected by the first to fourth connecting portions 28 to 31, the second piece (first laminated portion) 56 of the heat sink 51 and the upper heat sink 52 are sandwiched and compressed between the upper housing member 21 and the lower housing member 22. As a result, the second piece 56 of the heat sink 51 and the upper heat sink 52 are in close contact with each other.

[0102] like Figure 7 and Figure 8 As shown, the lower heat sink 53 is stacked on the lower side of the sheet base 58 of the lower shell member 22. Therefore, the lower heat sink 53 is arranged on the portion of the lower surface of the bottom plate 22a of the lower shell member 22 that is recessed upward. Figure 10 As shown, the lower heat sink 53 is a sheet material formed into a rectangular shape in a plan view. The lower heat sink 53 is formed of a synthetic resin having thermal conductivity, such as acrylic, other acrylic materials, silicone materials, etc.

[0103] like Figure 7 and Figure 8 As shown, the lower surface of the lower heat sink 53 contacts the upper surface of the mounted component 100 to which the electrical junction box 10 is mounted. The lower heat sink 53 is fixed to the boss portion 11a (see FIG. 1 ) of the housing 11 by bolts or the like. Figure 1 ) is mounted on the mounted component 100 and is compressed between the plate 58 of the lower housing member 22 and the mounted component 100. As a result, the lower housing member 22 and the lower heat sink 53 are in close contact with each other, and the lower heat sink 53 and the mounted component 100 are in close contact with each other.

[0104] Relay 12 generates heat as its internal contacts open and close. The heat generated in relay 12 is transferred from terminal 12a to heat sink 51 and busbar 13. Heat sink 51 is stacked with upper fins 52, lower housing member 22, and lower fins 53. Because its heat capacity is greater than that of busbar 13, heat generated in relay 12 is transferred to heat sink 51 more than to busbar 13. The heat transferred to heat sink 51 is then transferred to mounted component 100 via upper fins 52, lower housing member 22 (plate 58), and lower fins 53, where it is dissipated externally.

[0105] The upper housing member 21 is disposed between the second piece 15 of the busbar 13 and the second piece 56 of the heat sink 51. The upper housing member 21 vertically divides the power supply path on the busbar 13 side and the heat dissipation path on the heat sink 51 side. This allows the heat generated by the relay 12 to be efficiently transferred to and dissipated by the heat sink 51 side.

[0106] The heat sink 51 and the upper fins 52 are sandwiched from above and below by the upper housing member 21 and the lower housing member 22, and are in close contact with each other. In particular, because the upper fins 52 are softer than the heat sink 51, they are compressed in the vertical direction Z and firmly adhere to the heat sink 51. This allows for efficient heat transfer between the heat sink 51 and the upper fins 52.

[0107] The upper housing member 21 has a protrusion 44 on the lower surface of the top plate 21a, which suppresses bending deformation such as warping of the top plate 21a. Therefore, the top plate 21a can evenly press the heat sink 51 against the upper fins 52, making the upper fins 52 closely attached to the heat sink 51.

[0108] The protrusion 44 of the top plate 21a extends in the protruding direction of the protrusion 25, that is, in the front-to-back direction Y. Since the top end (front end) of the protrusion 25 is easily bent and deformed in the up-down direction Z, the protrusion 25 can be effectively suppressed from bending and deforming by extending the protrusion 44 in the front-to-back direction Y.

[0109] Since the top plate 21a contacts the heat sink 51 at the tip of the protrusion 44, the contact area with the heat sink 51 can be reduced. Therefore, heat transfer from the heat sink 51 to the top plate 21a can be suppressed, and heat dissipation from the heat sink 51 to the upper heat sink 52 can be promoted.

[0110] The protrusions 44 may also be formed on the bottom plate 22a of the lower housing member 22. In this case, the protrusions 44 can suppress bending deformation such as warping of the lower housing member 22. Alternatively, the protrusions 44 may be formed on both the upper housing member 21 and the lower housing member 22. The protrusions 44 may also extend in the left-right direction X.

[0111] The housing 11 includes a first connecting portion 28 and a second connecting portion 29 that connect the upper housing member 21 and the lower housing member 22. The first connecting portion 28 and the second connecting portion 29 sandwich the heat sink 51 and the upper heat sink 52, which constitute the heat dissipation structure 50, and are arranged at intervals in the front-to-back direction Y. The first connecting portion 28 is provided on the outer periphery of the housing 11 (the top end of the protrusion 25), while the second connecting portion 29 is arranged further inward than the outer periphery of the housing 11. By providing such first connecting portion 28 and second connecting portion 29, the heat sink 51 and the upper heat sink 52 can be securely and tightly sandwiched between the upper and lower housing members 21 and 22, enabling efficient heat transfer between the two.

[0112] Furthermore, the housing 11 includes third and fourth connecting portions 30, 31 at the left and right ends of the protruding portion 25, which connect the upper housing member 21 and the lower housing member 22. Therefore, the upper housing member 21 and the lower housing member 22 are connected by the first to fourth connecting portions 28, 31 at positions surrounding the heat sink 51 and the upper heat sink 52 from all sides. This ensures that the heat sink 51 and the upper heat sink 52 are in close contact with each other more reliably.

[0113] like Figure 8 and Figure 12As shown, in the bottom plate 22a of the lower housing member 22, the engaged portion 38 of the second connecting portion 29 is formed near the opening 41 that penetrates the bottom plate 22a in the vertical direction Z. Figure 4 As shown, the lower housing member 22 has a wall portion 43 projecting upward toward the upper housing member 21 between the opening 41 and the heat sink 51. The wall portion 43 is located at the front edge of the opening 41. A gap t is formed between the upper end of the wall portion 43 and the top plate 21a of the upper housing member 21.

[0114] In this embodiment, the second connecting portion 29 is disposed behind the heat sink 51, and an opening 41 for inserting the engaging portion 37 of the second connecting portion 29 is formed in the lower housing member 22. Therefore, the heat sink 51 and the mounted component 100 are disposed close to each other with a space between them. The heat sink 51 is a conductive component, and due to the application of voltage from the terminal 12a of the relay 12, there is a possibility of a short circuit with the mounted component 100 across the space between them. In this embodiment, since the wall portion 43 is provided between the heat sink 51 and the mounted component 100, the insulation distance (creepage distance) between the heat sink 51 and the mounted component 100 can be extended, thereby improving the insulation between the heat sink 51 and the mounted component 100.

[0115] Figure 11 yes Figure 2 CC line cross-sectional view.

[0116] like Figure 8 and Figure 11 As shown, the positioning protrusion 45 provided on the top plate 21a of the upper housing member 21 penetrates the heat sink 51, the upper heat sink 52, the lower housing member 22 and the lower heat sink 53 in the vertical direction Z. Figure 10 As shown, positioning holes 56a, 52a, and 53a extending in the vertical direction Z are formed in the second sheet 56 of the heat sink 51, the upper heat sink 52, and the lower heat sink 53. Furthermore, positioning holes 58d extending in the vertical direction Z are also formed in the bottom plate 22a of the lower housing member 22. Positioning protrusions 45 of the upper housing member 21 are inserted into these positioning holes 56a, 52a, 53a, and 58d to relatively position the upper housing member 21, the heat sink 51, the upper heat sink 52, the lower housing member 22, and the lower heat sink 53. This ensures that these components are properly positioned.

[0117] The lower end portion 45a of the positioning protrusion 45 may not penetrate the lower heat sink 53 but may be inserted. Figure 8As shown by the imaginary line in the figure, the lower end portion 45a of the positioning protrusion 45 may protrude downward from the lower heat sink 53. In this case, the positioning protrusion 45 can be used to position the electrical junction box 10 relative to the mounted component 100 by fitting the lower end portion 45a of the positioning protrusion 45 into a recess (not shown) formed in the mounted component 100.

[0118] like Figure 10 As shown, the two heat sinks 51 arranged side by side have substantially the same outer shape. Therefore, when assembled into the housing 11, they can be assembled in reverse. In this embodiment, the two heat sinks 51 have positioning holes 56a formed at different positions. For example, the positioning holes 56a on the left heat sink 51 are offset to the right, while the positioning holes 56a on the right heat sink 51 are offset to the left. Therefore, even if the left and right heat sinks 51 are assembled in reverse, the positioning protrusions 45 of the upper housing member 21 cannot be inserted into the positioning holes 56a, thereby preventing incorrect assembly of the left and right heat sinks 51.

[0119] The positioning protrusions 45 may also be provided on the lower housing member 22. In this case, there may be a positioning protrusion that protrudes upward from the bottom plate 22a of the lower housing member 22 and is inserted into the upper heat sink 52, the heat sink 51, and the upper housing member 21, and a positioning protrusion that protrudes downward from the bottom plate 22a and is inserted into the lower heat sink 53.

[0120] like Figure 8 As shown, the heat sink 51 is connected to the terminal 12a of the relay 12. Therefore, the heat generated at the contact point in the relay 12 can be efficiently transferred from the terminal 12a to the heat sink 51.

[0121] In addition, if Figure 8 As shown, the heat sink 51 and the bus bar 13 overlap at the position of the terminal 12a of the relay 12. Therefore, a voltage can be applied from the terminal 12a to the bus bar 13, and heat can be transferred from the terminal 12a to the heat sink 51.

[0122] Supplementary Notes

[0123] In addition, about the above-mentioned embodiment and various modification examples, at least a part thereof can also be arbitrarily combined with each other. In addition, it should be considered that the embodiment disclosed this time is illustrative in all aspects and is not restrictive. The scope of this disclosure is represented by the scope of claim, and it is intended to include all changes within the meaning and scope equivalent to the scope of claim.

[0124] Description of Reference Numerals

[0125] 10: Electrical junction box

[0126] 11: Shell

[0127] 11a: Boss

[0128] L1: long side

[0129] L2: short side

[0130] 12: Relay

[0131] 12a: terminal

[0132] 12b: Internal threaded hole

[0133] 13: Busbar

[0134] 14: The first piece

[0135] 14a: Connection hole

[0136] 15: Second sheet (second laminated portion)

[0137] 15a: Connection hole

[0138] 16: Connecting parts

[0139] 21: Upper housing component (first housing component)

[0140] 21a: Top plate

[0141] 21b: Outer wall

[0142] 22: Lower housing component (second housing component)

[0143] 22a: Baseboard

[0144] 22b: Outer wall

[0145] 23: Relay station

[0146] 24: Busbar stand

[0147] 25: Protrusion

[0148] 26: Slit

[0149] 28: First connection

[0150] 29: Second connection

[0151] 30: Third connection

[0152] 31: Fourth connection

[0153] 34: snap-fit ​​part

[0154] 34a: Claw receiving portion

[0155] 35: Engaged part

[0156] 35a: Claw

[0157] 37: Engaging portion (second connecting portion)

[0158] 37a: Hook

[0159] 37b: Engagement surface

[0160] 38: Engaged part

[0161] 38a: Hook

[0162] 38b: snap-fit ​​surface

[0163] 40: Opening

[0164] 41: Opening

[0165] 43: Wall

[0166] 44: protrusion

[0167] 45: Positioning protrusion (positioning part)

[0168] 50: Heat dissipation structure

[0169] 51: heat sink (first heat sink component)

[0170] 52: Upper heat sink (second heat sink)

[0171] 52a: Positioning hole

[0172] 53: Lower heat sink (third heat sink)

[0173] 53a: Positioning hole

[0174] 55: The first piece

[0175] 55a: Connection hole

[0176] 56: Second sheet (first laminated portion)

[0177] 56a: Positioning hole

[0178] 58: Tablet (lower shell component)

[0179] 58a: Upper surface

[0180] 58b: lower surface

[0181] 58c: protrusion.

Claims

1. An electrical junction box comprising: case; a relay, mounted on the housing; a bus bar connected to the terminals of the relay; and A first heat dissipation component is connected to the relay in a heat transfer manner. The housing includes a first housing member and a second housing member, wherein the second housing member is connected to the first housing member and forms a housing space between the second housing member and the first housing member. The first heat dissipating component has a first stacking portion stacked on the first housing component in the accommodation space. The bus bar includes a second laminated portion laminated on the first case member and the first laminated portion outside the case.

2. The electrical junction box according to claim 1, wherein The accommodation space further includes a second heat dissipating member that is disposed between the first stacking portion and the second case member and stacked on the first stacking portion and the second case member.

3. The electrical junction box according to claim 2, wherein: The first heat dissipation component is made of metal. The second heat dissipating member is made of synthetic resin.

4. The electrical junction box according to claim 2 or 3, wherein: A protrusion that resists bending deformation is formed on the first housing member or the second housing member.

5. The electrical junction box according to claim 4, wherein The protrusion is formed on a surface of the first case member on the first stacking portion side.

6. The electrical junction box according to claim 4 or 5, wherein: The housing has a protruding portion that protrudes in a second direction perpendicular to a first direction, the first direction being a stacking direction in which the first stacking portion and the second stacking portion are stacked. The first stacked portion of the first heat dissipation member and the second heat dissipation member are arranged on the protruding portion, and the protrusion extends along the second direction.

7. The electrical junction box according to any one of claims 1 to 6, wherein: The first heat sink is connected to a terminal of the relay.

8. The electrical junction box according to claim 7, wherein The first heat dissipating member and the bus bar overlap at positions of terminals of the relay.

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