electrical connection unit

Abstract

The electrical connection unit includes a heat dissipation member, a first electronic component, a first heat transfer member, a second electronic component, and a second heat transfer member. The first electronic component is disposed at a first side of the heat dissipation member. The first heat transfer member is disposed at a first side of the first electronic component and is configured to be disposed between the first electronic component and an external cooler. The second electronic component is disposed at a second side of the heat dissipation member. The second heat transfer member is disposed between the second electronic component and the heat dissipation member.

Description

Technical Field

[0001] Embodiments of the present invention relate to an electrical connection unit. Background Technology

[0002] It is known that electronic components such as relays and resistors are mounted on the mounting surface of the housing in the electrical connection unit.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-113184 Summary of the Invention

[0006] Incidentally, it is expected that the electrical connection unit will have improved thermal performance.

[0007] The embodiment provides an electrical connection unit that can improve thermal performance.

[0008] The electrical connection unit according to an embodiment includes a heat dissipation member, a first electronic component, a first heat transfer member, a second electronic component, and a second heat transfer member. The first electronic component is disposed on a first side of the heat dissipation member. The first heat transfer member is disposed on the first side of the first electronic component and configured to be disposed between the first electronic component and an external cooler. The second electronic component is disposed on a second side of the heat dissipation member. The second heat transfer member is disposed between the second electronic component and the heat dissipation member.

[0009] According to the embodiments, the thermal performance of the electrical connection unit can be improved. Attached Figure Description

[0010] Figure 1 This is a perspective view showing an electrical connection unit according to an embodiment.

[0011] Figure 2 This is a partially exploded perspective view showing the electrical connection unit according to an embodiment.

[0012] Figure 3 This is another partially exploded perspective view showing the electrical connection unit according to an embodiment.

[0013] Figure 4 This is a perspective view used to describe the electronic components and connecting components according to an embodiment.

[0014] Figure 5 This is a partially exploded perspective view of the first structure according to an embodiment.

[0015] Figure 6 This is a perspective view showing one of the wiring boards according to an embodiment.

[0016] Figure 7This is a top view showing one of the wiring boards according to an embodiment.

[0017] Figure 8 It is along Figure 7 The cross-sectional view of the structure taken by line F8-F8 in the diagram.

[0018] Figure 9 It is shown additionally Figure 8 A cross-sectional view of the electrical connection unit in the diagram.

[0019] Figure 10 This is a partially exploded perspective view of the second structure according to the embodiment.

[0020] Figure 11 This is an exploded perspective view showing the first structure and heat dissipation component according to the embodiment. Specific Implementation

[0021] Hereinafter, embodiments will be described with reference to the accompanying drawings. In the following description, structures having the same or similar functions are indicated by the same reference numerals. Redundant descriptions of these structures may be omitted. Note that the structures described below do not limit the scope of the embodiments.

[0022] In this disclosure, the terms are defined as follows. The term "connection" is not limited to mechanical connection and may include electrical connection. That is, "connection" is not limited to the case where two elements that are the objects of connection are directly connected, but may also include the case where another element is inserted between two elements that are the objects of connection. The term "accommodate" is not limited to the case where the entire component is accommodated, but may include the case where only a part of the component is accommodated (the state where the remaining part of the component protrudes). The terms "facing" and "overlapping" mean that when viewed from a particular direction, the virtual projected images of two target objects overlap each other. That is, the terms "facing" and "overlapping" are not limited to the case where two target objects face each other directly, but may include the case where two target objects face each other in a state where another component exists between the two target objects. "Parallel," "orthogonal," or "identical" may respectively include "substantially parallel," "substantially orthogonal," or "substantially identical." "Covering" may include "covering the main part while exposing a part."

[0023] In this disclosure, the +X direction, -X direction, +Y direction, -Y direction, +Z direction, and -Z direction are defined as follows. The +X direction is from the metal cover 70 described later (see...). Figure 1The first end 72e1 of the metal cap 70 faces the second end 72e2. The -X direction is the opposite of the +X direction. Hereinafter, the +X and -X directions will be simply referred to as the "X direction" without distinguishing between them. The +Y and -Y directions are directions that intersect (e.g., are orthogonal to) the X direction. The +Y direction is the direction from the third end 72e3 of the metal cap 70 described later toward the fourth end 72e4 (see [link to description]). Figure 1 The -Y direction is the direction opposite to the +Y direction. Hereinafter, without distinguishing between the +Y and -Y directions, it will be simply referred to as the "Y direction". The +Z and -Z directions are directions that intersect (e.g., are orthogonal) the X and Y directions. The +Z direction is the thickness direction of the top wall portion 72 of the metal cover 70 (see...). Figure 1 The -Z direction is the direction opposite to the +Z direction. Hereinafter, without distinguishing between the +Z and -Z directions, it will be simply referred to as the "Z direction". The Z direction is an example of the "first direction". The X direction is an example of the "second direction". The Y direction is an example of the "third direction". The "second direction" is not limited to the X direction and can be the Y direction or other directions. The "third direction" is not limited to the Y direction and is the direction that intersects with the "first direction" and the "second direction".

[0024] In the following text, when the X and Y directions are not distinguished from each other, the X and Y directions may be referred to as "horizontal directions". Hereinafter, the Z direction may sometimes be referred to as the "vertical direction". Hereinafter, the +Z direction side may sometimes be referred to as the "upper" side, and the -Z direction side as the "lower" side. However, these expressions are for ease of description and do not limit the direction of gravity of the electrical connection unit 100 (the mounting posture of the electrical connection unit 100).

[0025] (Example)

[0026] <1. Construction of the electrical connection unit>

[0027] The electrical connection unit 100 is, for example, an on-board device installed in a vehicle such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV). The electrical connection unit 100 may be referred to as an "electrical connection box" or "junction box." However, the electrical connection unit 100 is not limited to a box-shaped device.

[0028] like Figures 1 to 3 As shown, the electrical connection unit 100 includes, for example, a first structure 1A, a second structure 1B, and a plurality of connection busbars 47 (see...). Figure 2 ), second auxiliary component 48 (see Figure 2 ), metal cap 70, insulating sheet 91 (see Figure 3 ) and heat transfer component 92 (see Figure 3 The electrical connection unit 100 is configured to be in contact with the external cooler CM (see [reference]). Figure 9 The external cooler CM is, for example, a water jacket. The external cooler CM cools via the cooling surface CS of the cooler CM (see...). Figure 9 The device receives heat from the electrical connection unit 100 and cools the electrical connection unit 100. The electrical connection unit 100 may also, if necessary, include a cover that covers the second structure 1B from the +Z direction.

[0029] The first structure 1A is a unit that forms the first level part of the two-level hierarchical structure of the electrical connection unit 100. The second structure 1B is a unit that forms the second level part of the two-level hierarchical structure of the electrical connection unit 100.

[0030] In this embodiment, the electrical connection unit 100 includes a first region (first space) R1 and a second region (second space) R2 (see...). Figure 9 The first region R1 is, for example, a region where heat dissipation performance is emphasized. In the first region R1, for example, an electronic component 10S with a greater heat generation than the electronic component 10T described later is provided. On the other hand, the second region R2 is a region where performance other than heat dissipation performance is emphasized (e.g., improved operational stability of the installed electronic component 10, ease of component replacement, wiring, design flexibility, etc.). In the second region R2, for example, an electronic component 10T with a smaller heat generation than the electronic component 10S described later is provided. However, these aspects do not limit the content of the electrical connection unit 100 of this disclosure. For example, the heat generation of electronic component 10T may be greater than that of electronic component 10S. Hereinafter, electronic component 10S and electronic component 10T will not be distinguished from each other, and will be referred to as "electronic component 10".

[0031] <1.1 Construction of the First Structure>

[0032] like Figure 3 As shown, the first structure 1A in this embodiment is a unit that prioritizes heat dissipation performance. The first structure 1A includes multiple electronic components 10S, multiple connecting components 20, and a wiring board 40S. The multiple electronic components 10S are electrically connected to the wiring board 40S. The electronic components 10 (electronic components 10S) included in the first structure 1A are examples of "first electronic components".

[0033] The first structure 1A is disposed in the first region R1 of the aforementioned electrical connection unit 100 (see...). Figure 9 The first structure 1A faces the second surface 72b of the metal cover 70 described later in the Z direction (e.g., the first structure 1A faces the metal cover 70 from the -Z direction) (see...). Figure 9 The first structure 1A faces the cooler CM in the Z direction. The multiple electronic components 10S included in the first structure 1A are disposed on the second side (e.g., the +Z direction side) of the base member 41S (described later).

[0034] In this disclosure, the first side and the second side are defined as follows.

[0035] When the thickness direction of the top wall portion 72 included in the metal cover 70 is a first direction, the first side is one side along the first direction (e.g., the -Z direction side), and the second side is the other side along the first direction (e.g., the +Z direction side).

[0036] <1.2 Construction of the Second Structure>

[0037] like Figure 2 As shown, the second structure 1B in this embodiment is a unit that prioritizes performance different from heat dissipation. The second structure 1B includes multiple electronic components 10T, multiple busbars 42, and a cover member 40T. The electronic components 10T are electrically connected to the busbars 42 (described later). The electronic components 10 (electronic components 10T) in the second structure 1B are examples of "second electronic components".

[0038] The second structure 1B is disposed in the second region R2 of the aforementioned electrical connection unit 100 (see...). Figure 9 For example, the second structure 1B is disposed on the opposite side of the first structure 1A relative to the top wall portion 72 of the metal cover 70 (described later) (see [link]). Figure 9 The second structure 1B faces the first surface 72a of the metal cover 70 described later in the Z direction (e.g., the second structure 1B faces the metal cover 70 from the +Z direction side) (see... Figure 9 The second structure 1B includes a plurality of electronic components 10T disposed on the second side (e.g., the +Z direction side) of the cover member 40T (described later).

[0039] The first structure 1A can be composed of multiple units formed individually according to the application functions in the first structure 1A. The second structure 1B can be composed of multiple units formed individually according to the application functions in the second structure 1B.

[0040] <2. Detailed Construction of the First Structure>

[0041] Next, the construction of the first structure 1A included in the electrical connection unit 100 will be described in detail.

[0042] <2.1 Electronic Components 10S>

[0043] In this embodiment, the electrical connection unit 100 includes multiple electronic components 10, including electronic components 10S. For example, electronic component 10S is an electronic component that generates more heat when energized than electronic component 10T. Electronic component 10S is a relay (e.g., a mechanical relay or a semiconductor relay), a thermal fuse, etc. However, the types of electronic components 10S are not limited to the examples described above.

[0044] Figure 4 This is a perspective view showing the electronic component 10S and the connecting component 20. The electronic component 10S is, for example, an electronic component with a plurality of terminals 13 arranged at one end of the electronic component 10S. The electronic component 10S has, for example, a housing 11, a component body 12, a plurality of terminals 13 and a plurality of attachments.

[0045] (case)

[0046] The housing 11 is the outer component that forms most of the shape of the electronic component 10S. The housing 11 is made of, for example, synthetic resin and has insulating properties. The housing 11 houses the component body 12. The housing 11 and the component body 12 can be formed integrally.

[0047] In this embodiment, the housing 11 has an insulating rib 11a that projects in a horizontal direction (e.g., the X direction) and extends in a Z direction. The insulating rib 11a is, for example, plate-shaped, extending in both the horizontal (e.g., X direction) and Z direction. The insulating rib 11a extends, for example, along the entire length of the housing 11 in the Z direction. The insulating rib 11a is disposed between a plurality of terminals 13 (terminals 13A and 13B, described later). The insulating rib 11a electrically insulates the terminals 13A and 13B from each other. In this embodiment, a portion of the insulating rib 11a is disposed between the first portions 21 (described later) of two connecting members 20 connected to the electronic component 10S. The insulating rib 11a electrically insulates the first portions 21 of the two connecting members 20 connected to the electronic component 10S from each other.

[0048] (Main body of the component)

[0049] The component body 12 is the part that performs the main functions of the electronic component 10S. For example, if the electronic component 10S is a relay, the component body 12 includes a switch (e.g., a contact portion) that switches between an on and off state. For example, if the electronic component 10S is a fuse, the component body 12 includes a fuse portion that melts when an overcurrent flows. For example, if the electronic component 10S is a capacitor, the component body 12 includes a portion that accumulates charge.

[0050] (terminal)

[0051] Terminal 13 is an electrical connection exposed to the outside of housing 11. Terminal 13 is electrically connected to component body 12 inside housing 11. In this embodiment, electronic component 10S includes terminals 13A and 13B, which are a plurality of terminals 13. One of terminals 13A and 13B is a positive terminal. The other of terminals 13A and 13B is a negative terminal. In electronic component 10S, one of terminals 13A and 13B is an example of a "first terminal". The other of terminals 13A and 13B is an example of a "second terminal".

[0052] In the electronic component 10S of this embodiment, terminals 13A and 13B are disposed at one end of the electronic component 10S in a horizontal direction (e.g., the X direction). Terminals 13A and 13B are arranged in a horizontal direction (e.g., the Y direction). Each of terminals 13A and 13B points in the horizontal direction (e.g., the X direction). Each terminal 13 has an attachment hole 13h for attachment of a fastening member 96 (e.g., a screw or bolt, described later). The attachment hole 13h is open in the horizontal direction (e.g., the Y direction). The inner peripheral surface of the attachment hole 13h of the electronic component 10S has a threaded groove.

[0053] (Attached section)

[0054] The attachment portion 14 is used to secure the electronic component 10S. The attachment portion has fastening members 95 (e.g., screws, bolts, etc., see below) for later description. Figure 11 The attachment hole 14h is open in the Z direction. The attachment hole 14h is an insertion hole through which the fastening member 95 passes. The attachment hole 14h faces the attachment hole 73h of the fixing part 73 described later (see [link]). Figure 9 ). Attachment hole 14h is an example of "second attachment hole".

[0055] <2.2 Connecting Components>

[0056] Next, the connecting member 20 will be described. The connecting member 20 is a component that electrically connects the electronic component 10S to the wiring board 40S. For example, the connecting member 20 electrically connects an electronic component 10 (e.g., electronic component 10S) included in a plurality of electronic components 10 included in the first structure 1A to a busbar 42 included in the first structure 1A. The connecting member 20 forms part of a power path in the first structure 1A. The connecting member 20 in this disclosure is a component that forms a vertical power path. For example, the connecting member 20 forms a power path in the first structure 1A from the electronic component 10S toward the -Z direction side. The connecting member 20 is made of metal (e.g., copper, copper alloy, aluminum, or aluminum alloy). The connecting member 20 may also be referred to as a "vertical wiring component." Furthermore, the connecting member 20 may also be referred to as a "metal component."

[0057] In this embodiment, the connecting component 20 connects the electronic component 10S to the busbar 42 included in the wiring board 40S (see...). Figure 5 Electrical connection. In this embodiment, the length L12 of the connecting member 20 in the longitudinal direction (e.g., the Y direction) of the electronic component 10S is less than the length L11 of the electronic component 10S in that longitudinal direction. The connecting member 20 includes, for example, a first part 21 and a second part 22.

[0058] (Part 1)

[0059] The first portion 21 of the connecting member 20 is the portion that connects to the terminal 13 of the electronic component 10S. The first portion 21 is a plate-shaped or cuboid portion extending along the Z direction. The first portion 21 extends along one end (e.g., the end in the X direction) of the electronic component 10S in the Z direction. The first portion 21 is an upright portion that stands perpendicular to the wiring board 40S (e.g., relative to the busbar 42 described later) in the Z direction. The first portion 21 is adjacent to the electronic component 10S in the horizontal direction (e.g., the X direction). For example, the first portion 21 is adjacent to the terminal 13 of the electronic component 10S in the horizontal direction (e.g., the X direction) and connected to the terminal 13 of the electronic component 10S from the horizontal direction (e.g., the X direction).

[0060] The first portion 21 of the connecting member 20 has an attachment hole 21h through which a fastening member 96 (e.g., a screw or bolt) passes. The attachment hole 21h is open in a horizontal direction (e.g., the X direction). The fastening member 96, which has passed through the attachment hole 21h, engages with the attachment hole 13h of the terminal 13 of the electronic component 10S, and thus, the first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10S.

[0061] (Part Two)

[0062] The second part 22 of the connecting component 20 is the part that connects to the busbar 42 (see...) Figure 5 The second part 22 protrudes horizontally (e.g., in the X direction) from the end of the first part 21 on the -Z direction side. The second part 22 is a plate extending horizontally. The second part 22 is adjacent to the busbar 42 in the Z direction and is connected to the busbar 42 in the Z direction (see...). Figure 5 The second part 22 of the connecting component 20 is attached from the Z direction to a fastening member 43 (e.g., screw, bolt, etc., see +Z direction) protruding from the busbar 42. Figure 5 The connection is physically and electrically connected to the busbar 42. In this embodiment, the second portion 22 of the connecting member 20 has an attachment hole 22h through which the fastening member 43 passes. The attachment hole 22h opens in the Z direction. In the second portion 22, the fastening member 43 passes through the attachment hole 22h. A coupling member 44 (e.g., a nut; see...) Figure 5 , Figure 9 The first part 21 and the second part 22 engage with the end of the fastening member 43 that has passed through the attachment hole 22h, thereby securing the second part 22 to the busbar 42. In this embodiment, the first part 21 and the second part 22 form an L-shaped connecting member 20.

[0063] In this embodiment, the busbar 42 is positioned away from the terminal 13 of the electronic component 10S (e.g., away in the Z direction). The connecting member 20 is positioned between the electronic component 10S and the busbar 42. In this disclosure, the phrase "the connecting member is positioned between the electronic component and the busbar" is not limited to the case where a portion of the connecting member is located between the electronic component and the busbar when viewed from the X or Y direction. The phrase "the connecting member is positioned between the electronic component and the busbar" can correspond to the case where a portion of the connecting member is located between the electronic component and the busbar when viewed from a direction inclined relative to the X or Y direction. The connecting member 20 electrically connects the terminal 13 of the electronic component 10S to the busbar 42.

[0064] <2.3 Construction of the wiring board of the first structure>

[0065] The wiring board 40S in the first structure 1A will be described in detail.

[0066] Figure 5 This is a perspective view illustrating the wiring board 40S. The wiring board 40S is a component that forms a power path between the plurality of electronic components 10S included in the first structure 1A. In this embodiment, the wiring board 40S has a plate shape extending in the X and Y directions.

[0067] In this disclosure, "wiring board" refers to a board-shaped wiring board. "Board-shaped" means a plate-like shape that extends along a plane when viewed as a whole, and is not related to fine details. In this disclosure, the terms "plate-like," "sheet-like," or "plane" are not limited to the case of being completely flat, and may include cases where there are fixing structures, ribs, etc., that protrude in part along the Z-direction, or cases where there are uneven shapes on the surface that follow the thickness of the busbars, etc.

[0068] The wiring board 40S, for example, has a base member 41S, a plurality of busbars 42, and a plurality of fastening members 43. In this embodiment, the base member 41S and some of the busbars 42 are integrated by insert molding. For example, after the fastening members 43 are fixed to the busbars 42, the wiring board 40S is formed as an integral component by insert molding the busbars 42 with the base member 41S. That is, some of the busbars 42 are integrated with the base member 41S without using fastening members such as screws or bolts. Note that the wiring board 40S can be formed by using another structure instead of insert molding. A modified example of forming the wiring board 40S by using another structure will be described later.

[0069] Figure 6 This is a partially exploded perspective view of the wiring board 40S. In the following description, for ease of description, the base component 41S, busbar 42, and fastening component 43 will be described with reference to the partially exploded view of the wiring board 40S.

[0070] <2.3.1 Base Components>

[0071] The base member 41S is a support member that supports multiple electronic components 10S and / or multiple busbars 42. In this embodiment, the base member 41S supports the busbars 42 and indirectly supports multiple electronic components 10S via the connecting member 20. The multiple busbars 42 are arranged at certain intervals in the horizontal direction. The base member 41S electrically insulates the multiple busbars 42 from each other. The base member 41S includes, for example, a flat surface portion 51, a wall portion 52, and multiple openings 53. The base member 41S is made of, for example, synthetic resin and has insulating properties.

[0072] The base member 41S included in the wiring board 40S is an example of a "support member". The base member 41S supports one of the multiple busbars 42 included in the wiring board 40S that is electrically connected to the electronic component 10S (e.g., busbars 42A, 42B, 42C, 42D). Among the multiple busbars 42 included in the wiring board 40S, the busbar 42 electrically connected to the electronic component 10S is an example of a "first wiring member". In this embodiment, four busbars 42A, 42B, 42C, and 42D are "first wiring members" (see [link to documentation]). Figure 5 ).

[0073] (Flat surface portion)

[0074] The flat surface portion 51 is a plate-shaped portion formed in the base member 41S. The flat surface portion 51 is plate-shaped and extends horizontally. The flat surface portion 51 forms the main part of the base member 41S. The flat surface portion 51 forms the base portion (insulating base portion) of the base member 41S. In this embodiment, the flat surface portion 51 extends over the entire width of the base member 41S in the X direction and over the entire width of the base member 41S in the Y direction, except for the wall portion 52 of the base member 41S.

[0075] The flat surface portion 51 has a first surface 51a and a second surface 51b. The first surface 51a is a surface pointing in the +Z direction. The first surface 51a is a flat surface extending in the horizontal direction. The first surface 51a faces the plurality of electronic components 10S and faces the metal cover 70 (see...). Figure 9 The second surface 51b is located on the side opposite to the first surface 51a. The second surface 51b is a surface pointing in the -Z direction. The second surface 51b is a flat surface extending in the horizontal direction. The second surface 51b faces the external cooler CM (see...). Figure 9The thickness direction (plate thickness direction) of the flat surface portion 51 is the Z direction, which coincides with the opening direction of the base member 41S in the opening portion 53. In this embodiment, the thickness T11 of the flat surface portion 51 in the Z direction is less than the thickness T1 of the busbar 42 in the Z direction (for example, the thickness of the horizontal plate portion 42p in the Z direction described below) (see...). Figure 8 The thickness T11 of the flat surface portion 51 in the Z direction can be equal to or greater than the thickness T1 of the busbar 42 in the Z direction.

[0076] The flat surface portion 51 has, for example, one or more receiving portions 55 for accommodating some busbars 42. For example, in this embodiment, the flat surface portion 51 has a plurality of receiving portions 55. The plurality of receiving portions 55 are formed separately from each other in the X or Y direction. Each receiving portion 55 is, for example, a through hole penetrating the flat surface portion 51 in the Z direction. The receiving portion 55 may be a recess provided on the first surface 51a or the second surface 51b of the flat surface portion 51 and recessed in the Z direction, rather than a through hole. In this disclosure, the phrase "receiving portion penetrating the flat surface portion in the first direction (Z direction)" may include a portion of the entire length of the receiving portion 55 penetrating the flat surface portion 51 in the Z direction (e.g., the remaining portion of the receiving portion 55 may be a recessed portion in the Z direction, or may be provided inside the base member 41S and not exposed to the outside of the base member 41S). Similarly, in this disclosure, the phrase “receiving portion recessed in the first direction (Z direction)” can include a portion of the entire length of the receiving portion 55 that is recessed in the Z direction (e.g., the remainder of the receiving portion 55 may be a through hole penetrating the flat surface portion 51 in the Z direction, or may be disposed inside the base member 41S and not exposed to the outside of the base member 41S).

[0077] Each receiving portion 55, when viewed from the Z direction, has a shape corresponding to the shape of the busbar 42 to be received. The plurality of receiving portions 55 includes, for example, four receiving portions 55A, 55B, 55C, and 55D. Receiving portion 55A is provided corresponding to busbar 42A (described later) and receives at least a portion of busbar 42A. Receiving portion 55B is provided corresponding to busbar 42B (described later) and receives at least a portion of busbar 42B. Receiving portion 55C is provided corresponding to busbar 42C (described later) and receives at least a portion of busbar 42C. Receiving portion 55D is provided corresponding to busbar 42D (described later) and receives at least a portion of busbar 42D.

[0078] The flat surface portion 51 has one or more locking portions 56. The locking portions 56 are used to lock the metal cover 70 and the first structure 1A. An example of the locking portion 56 is a mating claw (also referred to as a "clamp engagement"). The mating claw includes an arm 56AR extending from the flat surface portion 51 in the +Z direction and a protrusion 56PR protruding as part of the arm 56AR. The protrusion 56PR protrudes from the arm 56AR in a direction intersecting the extending direction (+Z direction) of the arm 56AR. In this embodiment, the protrusion 56PR protrudes toward the metal cover 70 and is locked to the retaining portion 71h described later (see [link to documentation]). Figure 1 For example, the protrusion 56PR has an inclined surface that is tilted relative to the Z direction. During the process of attaching the first structure 1A to the metal cover 70, when the locking part 56 approaches the metal cover 70, the protrusion 56PR is pressed by the peripheral wall 71 (described later) of the metal cover 70, and the arm 56AR is thus elastically deformed in a predetermined direction. Then, once the protrusion 56PR reaches the retaining part 71h, the arm 56AR returns from the deformed state, thereby locking the protrusion 56PR to the retaining part 71h.

[0079] (Wall section)

[0080] A wall portion 52 is provided at the peripheral end of the base member 41S. The wall portion 52 is a reinforcing rib that protrudes in the +Z direction from the end of the flat surface portion 51. The wall portion 52 can be used to position the first structure 1A and the metal cover 70 during assembly. Note that the wall portion 52 can be omitted.

[0081] (Opening)

[0082] Opening 53 is an opening facing the attachment hole 73h of the fixing part 73 and the attachment hole 14h of the attachment part 14 (see...). Figure 5 , Figure 9 , Figure 11 (etc.). The opening 53 extends through the base member 41S in the Z direction. The fastening member 95 (e.g., a screw or bolt), described later, passes through the opening 53. This will be described later. The opening 53 may be an opening formed in a recessed shape through which the fastening member 95 (e.g., a screw or bolt) can be inserted.

[0083] The base member 41S may also have ribs 51L protruding from the flat surface portion 51 in the +Z direction around the opening 53. The ribs 51L can support the attachment portion 14 from the -Z direction (see...). Figure 9 Instead of the example above, the base member 41S may have a boss with an opening 53.

[0084] (First auxiliary component)

[0085] The wiring board 40S may also include one or more first auxiliary components 46 as needed. For example... Figure 5As also shown, the first auxiliary member 46 is a support member that assists in the three-dimensional wiring of some busbars 42 (e.g., busbars 42 corresponding to the "three-dimensional wiring member" described below). The first auxiliary member 46 supports the busbar 42 from the -Z direction side. The first auxiliary member 46 supports the second connection portion 62 of the busbar 42 at a position away from the first connection portion 61 of the busbar 42 (e.g., a position away in the Z direction). The first auxiliary member 46 is made of, for example, synthetic resin and has insulating properties.

[0086] The first auxiliary member 46 may also integrally support two or more busbars 42. For example, in this embodiment, busbars 42E and 42I, described later, are supported by a first auxiliary member 46. For example, in this embodiment, busbars 42F and 42H, described later, are supported by a first auxiliary member 46.

[0087] The first auxiliary member 46 can integrally support the busbar 42 and the connecting busbar 47. For example, in this embodiment, the connecting busbar 47A and the busbar 42W, described later, are supported by a first auxiliary member 46 (see [link]). Figure 1 , Figure 2 , Figure 3 ).

[0088] The first auxiliary member 46 is fixed to the base member 41S of the wiring board 40S, for example, by means of a snap-fit. With the first auxiliary member 46 fixed to the base member 41S, the assemblability of the first structure 1A is improved. Thereafter, any of the busbars 42 supported by the first auxiliary member 46 is connected via a fastening member 43 to the busbar 42 supported by the base member 41S (e.g., busbars 42A, 42B, 42C, and 42D corresponding to the "horizontal wiring members" described below).

[0089] The first auxiliary member 46 may have an opening. Any of the busbars 42 supported by the first auxiliary member 46 is exposed through the opening to the base member 41S on the -Z direction side of the first auxiliary member 46. For example, any busbar exposed from the first auxiliary member 46 is connected to the busbar 42 supported by the base member 41S via a fastening member 43.

[0090] The first auxiliary component 46 is positioned between the base component 41S and the busbar 42 (busbar 42E, 42F, 42G, 42H, 42I, 42V, 42W, etc.) corresponding to the "three-dimensional wiring component" described later when viewed from the X or Y direction.

[0091] <2.3.2 Busbar>

[0092] Next, the busbars 42 included in the wiring board 40S will be described. The busbars 42 are wiring components (electrical connection components) of the electrical connection unit 100. The busbars 42 included in the wiring board 40S are electrically connected, for example, to at least one electronic component 10S included in a plurality of electronic components 10S. For example, each of some busbars 42 electrically connects two electronic components 10 included in a plurality of electronic components 10 (e.g., a plurality of electronic components 10S). The busbars 42 are made of metal (e.g., copper, copper alloy, aluminum, or aluminum alloy) and are conductive.

[0093] In this embodiment, the plurality of busbars 42 in the first structure 1A includes, for example, 11 busbars 42A, 42B, 42C, 42D, 42E, 42F, 42G, 42H, 42I, 42V, and 42W (see [link to documentation]). Figure 5 , Figure 6 ).

[0094] For example Figure 6 As shown, four busbars 42A, 42B, 42C, and 42D are arranged at certain intervals in the horizontal direction. Each busbar 42A, 42B, 42C, and 42D includes portions disposed on the same plane. Each busbar 42A, 42B, 42C, and 42D is supported by a flat surface portion 51 of the base member 41S. In this disclosure, the phrase "busbars are supported by a flat surface portion" is not limited to the case where the busbar 42 is received in the receiving portion 55, but may also include the case where the busbar 42 is attached to a first surface 51a or a second surface 51b of the flat surface portion 51. The four busbars 42A, 42B, 42C, and 42D are integrated with the base member 41S by insert molding.

[0095] At least a portion of each busbar 42 is plate-shaped and extends horizontally.

[0096] For example, at least a portion of each of the four busbars 42A, 42B, 42C, and 42D is received in the receiving portion 55 and extends along the flat surface portion 51. That is, at least a portion of each of the four busbars 42A, 42B, 42C, and 42D extends along the first surface 51a of the flat surface portion 51. At least a portion of each of the four busbars 42A, 42B, 42C, and 42D extends horizontally in the receiving portion 55. Hereinafter, the portion of each of the four busbars 42 that extends in a plate-like shape in the horizontal direction may be referred to as a "horizontal plate portion 42p". The horizontal plate portion 42p is an example of a "plate portion". The four busbars 42A, 42B, 42C, and 42D are components that form a power path in the horizontal direction. The four busbars 42A, 42B, 42C, and 42D may be referred to as "horizontal wiring components". At least a portion of the busbar 42 corresponding to the "horizontal wiring component" extends horizontally in the receiving portion 55. Thus, a horizontally oriented power path is formed in the wiring board 40S.

[0097] For example, the four busbars 42A, 42B, 42C, and 42D are located on the first side (-Z direction side) relative to the electronic components 10 of the first structure 1A. That is, the four busbars 42A, 42B, 42C, and 42D are located on the side opposite to the top wall portion 72 of the metal cover 70 relative to the electronic components 10 of the first structure 1A.

[0098] Also Figure 5 As shown, seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W are arranged in three dimensions at certain intervals. The seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W are supported by a first auxiliary member 46. The first connection portion 61 and the second connection portion 62 of each of the seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W extend horizontally on the first auxiliary member 46. The seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W form a power path along the vertical direction. The seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W can be referred to as "three-dimensional wiring components". In the busbar 42 corresponding to the "three-dimensional wiring component", the second connection portion 62 of the busbar 42 is located away from the first connection portion 61 (for example, away in the Z direction). As a result, a vertical power path is formed in the wiring board 40S.

[0099] like Figures 5 to 7 As shown, each busbar 42 includes, for example, a first connecting portion 61, a second connecting portion 62, and an extension portion 63.

[0100] The first connection portion 61 is located in the middle of the busbar 42 or at the first end of the busbar 42. The first connection portion 61 is the portion that connects directly or via the connection member 20 to the electronic component 10 (e.g., electronic component 10S). Furthermore, instead of the above example, the first connection portion 61 can be connected to other busbars 42 (e.g., busbars 42 different from those connected to the electronic component 10). Alternatively, the first connection portion 61 (e.g., the first connection portion 61 of busbar 42W) can be connected to an external connection busbar 99 (see...). Figure 1 , Figure 2 and Figure 3 ).

[0101] Furthermore, the first connecting portion 61 includes, for example, a portion that overlaps with the connecting member 20 when viewed from the Z direction. The first connecting portion 61 is adjacent to the connecting member 20 in the Z direction and is connected to the connecting member 20 from the Z direction. Instead of the above example, for example, the first connecting portion 61 may be adjacent to the terminal 13 of the electronic component 10 in the Z direction and directly connected to the terminal 13 of the electronic component 10 from the Z direction.

[0102] The second connection portion 62 is located in the middle of the busbar 42 or at the second end of the busbar 42. The second connection portion 62 is the portion that connects directly or via the connection member 20 to the electronic component 10 (e.g., electronic component 10S). Instead of the above example, the second connection portion 62 can be connected to another busbar 42 (e.g., a different busbar 42 from the one connected to the electronic component 10). Furthermore, instead of the above example, the second connection portion 62 can be connected to a connecting busbar 47 or an external connecting busbar 99 (see...). Figure 1 and Figure 2 For example, the second connection 62 is connected to an external device via an external connection busbar 99. The external connection busbar 99 is an example of an "external connection component".

[0103] The extension 63 extends over the first connecting portion 61 and the second connecting portion 62. The extension 63 is disposed between the first connecting portion 61 and the second connecting portion 62. The extension 63 connects the first connecting portion 61 to the second connecting portion 62.

[0104] In this embodiment, the horizontal plate portion 42p includes at least the entire first connecting portion 61 and a portion of the extension portion 63. That is, in the four busbars 42A, 42B, 42C, and 42D, at least the entire first connecting portion 61 and a portion of the extension portion 63 are accommodated in the receiving portion 55 and are located on the same plane.

[0105] The following describes some wiring examples of the busbar 42 in the wiring board 40S. The plurality of electronic components 10S includes two electronic components 10A and 10B. The plurality of connection components 20 includes four connection components 20A, 20B, 20C, and 20D.

[0106] First, the four busbars 42A, 42B, 42C, and 42D will be explained.

[0107] Busbar 42A includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 is connected to the terminal 13A of the electronic component 10A via a connecting member 20A. The second connecting portion 62 is disposed on the -X direction side of the first connecting portion 61 and is connected to an external connecting busbar 99. The external connecting busbar 99 is supported from the -Z direction by a first auxiliary member 46. The extension portion 63 is received in a receiving portion 55 so that when viewed from the Z direction, it extends through the region R overlapping with the electronic component 10A on both sides of the region R (see [reference]). Figure 7 ).

[0108] Busbar 42B includes a first connecting portion 61, two second connecting portions 62, and an extension 63. The first connecting portion 61 is connected to the terminal 13B of the electronic component 10A via a connecting member 20B. The corresponding second connecting portions 62 are located on the -X direction side of the first connecting portion 61 and are connected to other busbars 42 (busbars 42E, 42F). The other busbars 42 (busbars 42E, 42F) are supported from the -Z direction by a first auxiliary member 46.

[0109] Busbar 42C includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 is connected to the terminal 13B of the electronic component 10B via a connecting member 20C. The second connecting portion 62 is disposed on the -Y direction side of the first connecting portion 61 and is connected to another busbar 42 (busbar 42G). The other busbar 42 (busbar 42G) is supported from the -Z direction by a first auxiliary member 46.

[0110] Busbar 42D includes a first connecting portion 61, two second connecting portions 62, and two extension portions 63. The first connecting portion 61 is connected to the terminal 13A of the electronic component 10B via a connecting member 20D. One of the two second connecting portions 62 is located on the +X direction side of the first connecting portion 61 and is connected to another busbar 42 (busbar 42H). The other of the two second connecting portions 62 is located on the -X direction side of the first connecting portion 61 and is connected to another busbar 42 (busbar 42I). The other busbars 42 (busbars 42H, 42I) are supported from the -Z direction by a first auxiliary member 46.

[0111] Next, the seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W will be described. The seven busbars 42E, 42F, 42G, 42H, 42I, 42V, and 42W are used for three-dimensional routing while supported by the first auxiliary member 46 in the -Z direction.

[0112] The busbar 42E includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 of the busbar 42E is connected to the second connecting portion 62 of the busbar 42A. The second connecting portion 62 is located on the +Z direction side of the first connecting portion 61 and is connected to an external connecting busbar 99. The second connecting portion 62 of the busbar 42E is exposed from the metal cover 70 toward the +Z direction side through the insertion portion 75 (described later) of the metal cover 70 (see [link]). Figure 2 , Figure 3 ).

[0113] Busbar 42F includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 of busbar 42F is connected to the second connecting portion 62 of busbar 42B. The second connecting portion 62 is located on the +Z direction side of the first connecting portion 61 and is connected to an external connecting busbar 99. Busbar 42F can be omitted. The second connecting portion 62 of busbar 42F is exposed from the metal cover 70 toward the +Z direction side through the insertion portion 75 (described later) of the metal cover 70 (see [link]). Figure 2 , Figure 3 ).

[0114] Busbar 42G includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 of busbar 42G is connected to the second connecting portion 62 of busbar 42C. The second connecting portion 62 is disposed on the +Z direction side of the first connecting portion 61 and is connected to the connecting busbar 47B. The second connecting portion 62 of busbar 42G extends from the metal cover 70 toward the +Z direction side (see [link to metal cover]) via the insertion portion 75 (described later) of the metal cover 70. Figure 2 , Figure 3 Exposure.

[0115] Busbar 42H includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 of busbar 42H is connected to the second connecting portion 62 of busbar 42D. The second connecting portion 62 is located on the +Z direction side of the first connecting portion 61 and is connected to an external connecting busbar 99. Busbar 42H can be omitted. The second connecting portion 62 of busbar 42H extends from the metal cover 70 toward the +Z direction side (see [link to relevant documentation]) via the insertion portion 75 of the metal cover 70 (described later). Figure 2 , Figure 3 Exposure.

[0116] Busbar 42I includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 of busbar 42I is connected to the second connecting portion 62 of busbar 42D. The second connecting portion 62 is disposed on the +Z direction side of the first connecting portion 61 and is connected to an external connecting busbar 99. The second connecting portion 62 of busbar 42I extends from the metal cover 70 toward the +Z direction side (see [link to metal cover]) via the insertion portion 75 of the metal cover 70 (described later). Figure 2 , Figure 3 Exposure.

[0117] Busbar 42V includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 of busbar 42V is connected to the second connecting portion 62 of busbar 42A. The second connecting portion 62 is located on the +Z direction side of the first connecting portion 61 and is connected to an external connecting busbar 99. The second connecting portion 62 of busbar 42V extends from the metal cover 70 toward the +Z direction side (see [link to metal cover]) via the insertion portion 75 of the metal cover 70 (described later). Figure 2 , Figure 3 Exposure.

[0118] The busbar 42W includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 and the second connecting portion 62 of the busbar 42W are connected to an external connecting busbar 99. The second connecting portion 62 is located on the +Z direction side of the first connecting portion 61. The first connecting portion 61 and the second connecting portion 62 of the busbar 42W are exposed from the metal cover 70 towards the +Z direction side via the insertion portion 75 (described later) of the metal cover 70 (see [link]). Figure 2 and Figure 3 ).

[0119] Busbar 42V and external connecting busbar 99 can be directly connected to each other using fastening components (e.g., bolts or screws), welding, etc. Because the second connection portion 62 of busbar 42V is exposed towards the +Z direction side (see...), Figure 2 Therefore, even after the first structure 1A is fixed to the metal cover 70, the external connecting busbar 99 can be connected from the +Z direction side. The busbar 42W and the external connecting busbar 99 can be directly connected to the busbar 42W using fastening members (e.g., bolts or screws), welding, etc. Since the first connecting portion 61 and the second connecting portion 62 of the busbar 42W are exposed towards the +Z direction side (see...), Figure 2 Therefore, even after the first structure 1A is fixed to the metal cover 70, it is possible to connect the external connection busbar 99 from the +Z direction side.

[0120] <2.3.3 Fastening Components>

[0121] Next, the fastening component 43 will be described.

[0122] Figure 8 It is along Figure 7 The cross-sectional view of the structure is taken along line F8-F8. Fastening member 43 is a component used to secure busbar 42 to the connecting member 20 corresponding to busbar 42. Alternatively, instead of the above example, fastening member 43 can be a component used to secure connecting busbar 47 or external connecting busbar 99, and busbar 42. Fastening member 43 is, for example, a riveting bolt fixed to busbar 42. Fastening member 43 is an example of a "fastening part". Figure 7 In the middle, the following was omitted. Figure 3 The third heat transfer component 92C (described later) and the fourth heat transfer component 92D (described later) are described in the middle.

[0123] In some of the busbars 42 in this embodiment, at least one of the first connecting portion 61 and the second connecting portion 62 of the busbar 42 has a through hole 43h (see Figure 6 A through-hole 43h extends through the busbar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft 43a and a head 43b. The circumferential surface of the shaft 43a has a threaded groove. The diameter of the head 43b is larger than the diameter of the shaft 43a. The head 43b of the fastening member 43 is riveted and fixed to the busbar 42 with the shaft 43a passing through the through-hole 43h. Through this fixing, the fastening member 43 is electrically and physically connected to the busbar 42 with the shaft 43a protruding from the through-hole 43h in the +Z direction. The fastening member 43 is not limited to riveting; it can also be fixed to the busbar 42 by welding or other methods.

[0124] In this embodiment, after the connecting member 20 is secured to the electronic component 10 via the fastening member 96, it is attached to the fastening member 43 in the Z direction. For example, the shaft 43a of the fastening member 43 is inserted into the attachment hole 22h of the second portion 22 in the connecting member 20. The engaging member 44 (e.g., a nut) engages with the shaft 43a of the fastening member 43, which protrudes from the attachment hole 22h of the second portion 22 of the connecting member 20. The engaging member 44 is attached to the shaft 43a in the Z direction. Through this engagement, the second portion 22 of the connecting member 20 is secured to the fastening member 43.

[0125] (Exposed structure of the four busbars on the upper surface side)

[0126] Apart from Figure 8 In addition to the cross-sectional view shown, Figure 9Also shown is a metal cap 70 and a second structure 1B. In this embodiment, at least a portion of each of the four busbars 42A, 42B, 42C, and 42D is exposed to the upper surface side of the base member 41S. For example, in the four busbars 42A, 42B, 42C, and 42D, the first connecting portion 61, the second connecting portion 62, and the extension portion 63 are exposed to the outside of the base member 41S on the upper surface side (the first surface 51a side of the flat surface portion 51). For example, the extension portion 63 of the busbar 42 is exposed to the outside of the base member 41S on the upper surface side of the base member 41S at least along its entire length between the first connecting portion 61 and the second connecting portion 62.

[0127] (Exposed structure of the four busbars on the lower surface side)

[0128] In this embodiment, at least a portion of each of the four busbars 42A, 42B, 42C, and 42D is exposed on the lower surface side of the base member 41S. For example, in the four busbars 42A, 42B, 42C, and 42D, at least a portion of the entire first connecting portion 61 and the extension portion 63 is exposed to the outside of the base member 41S on the lower surface side (the second surface 51b side of the flat surface portion 51). In this embodiment, a gap S1 is formed between the flat surface portion 51 of the base member 41S and the external cooler CM. The busbar 42 includes an exposed portion 42u exposed to the gap S1. The exposed portion 42u includes, for example, the entire first connecting portion 61 and at least a portion of the extension portion 63. For example, the exposed portion 42u may be covered by an insulating sheet 91 (first insulating sheet 91A).

[0129] <3. Detailed Construction of the Second Structure>

[0130] Next, the construction of the second structure 1B included in the electrical connection unit 100 will be described in detail.

[0131] <3.1 Electronic Components 10T>

[0132] In this embodiment, the electrical connection unit 100 includes multiple electronic components 10, including electronic component 10T. Electronic component 10T is an electronic component that generates less heat when energized than electronic component 10S. Electronic component 10T can be, for example, a connector, fuse, capacitor, branch component, any of various sensors (e.g., current sensor or voltage sensor), electronic control unit, or an electronic component unit composed of two or more of these. However, the types of electronic component 10T are not limited to the examples described above.

[0133] like Figure 10As shown, the electronic component 10T in this embodiment is, for example, a current sensor (e.g., a current sensor including a shunt resistor). The electronic component 10T includes an output port 16 protruding in the +Z direction. When an external device (e.g., a control board or measuring instrument) is attached to the output port 16, the current value flowing through the electrical connection unit 100 (e.g., the current flowing through the first structure 1A) is monitored. For example, the electronic component 10T is an electronic component with two terminals 13 separately disposed at both ends in the horizontal direction. The electronic component 10T includes, for example, a housing 11, a component body 12, a plurality of terminals 13 (terminals 13A and 13B), and the output port 16. Note that in the construction of the electronic component 10T, structures having functions similar to those of the electronic component 10S are indicated by the same reference numerals. In this case, in the description of the electronic component 10T, "electronic component 10S" can be replaced with "electronic component 10T" in the description of the electronic component 10S described above.

[0134] In electronic component 10T, terminals 13A and 13B are arranged separately from each other in the horizontal direction (e.g., the X direction). Each terminal 13 has an attachment hole 13h through which a fastening member 43 (e.g., a screw or bolt) passes. The attachment hole 13h opens in the Z direction. In electronic component 10T, one of terminals 13A and 13B is an example of a "third terminal". The other of terminals 13A and 13B is an example of a "fourth terminal".

[0135] <3.2 Cover Components>

[0136] The cover member 40T in the second structure 1B is described in detail.

[0137] The cover member 40T covers a portion of the busbar 42 in the second structure 1B. The cover member 40T includes, for example, a wall portion 81 and one or more locking portions 83. The cover member 40T is made of, for example, synthetic resin and has insulating properties.

[0138] The wall portion 81 is, for example, a wall having a plate-like portion extending in a horizontal direction. The wall portion 81 extends in a horizontal direction (e.g., the X direction) to cover the lower surface of the extension 63 (described later) of the connecting busbar 47. The wall portion 81 is not limited to a wall portion extending in the horizontal direction; it can be a lattice-like wall portion formed by multiple ribs extending in the Z direction. In this embodiment, a fastening member 43 for fixing to the busbar 42 is provided on the wall portion 81. Furthermore, the wall portion 81 may partially have steps. For example, in this embodiment, two connecting busbars 47 are attached to the busbar 42 of the second structure 1B. The two connecting busbars 47 intersect each other three-dimensionally due to the steps of the wall portion 81.

[0139] For example, the cover member 40T may also include a receiving portion 82 that opens towards the +Z direction. The receiving portion 82 is a through hole penetrating the wall portion 81 in the Z direction. When viewed from the Z direction, the receiving portion 82 has a shape corresponding to the shape of the heat transfer member 92 (e.g., the second heat transfer member 92B) described later. The receiving portion 82 surrounds and receives the second heat transfer member 92B (described later) attached to the top wall portion 72 (see [link]). Figure 2 , Figure 10 Note that, by Figure 10 The second heat transfer member 92B, indicated by the imaginary line, can be accommodated in the housing 82.

[0140] (Locking section)

[0141] The locking part 83 is used to lock the metal cover 70 and the second structure 1B. An example of the locking part 83 includes a mating claw. The mating claw includes an arm 83AR extending from the wall portion 81 in the -Z direction and a protrusion 83PR projecting as part of the arm 83AR (see [link to documentation]). Figure 2 The protrusion 83PR protrudes from the arm 83AR in a direction intersecting the extending direction (-Z direction) of the arm 83AR. In this embodiment, the protrusion 83PR protrudes toward the metal cover 70 and locks to the retaining portion 74 described later (see [link]). Figure 1 For example, the protrusion 83PR has an inclined surface that is tilted relative to the Z direction. During the attachment of the second structure 1B to the metal cover 70, when the locking part 83 approaches the metal cover 70, the protrusion 83PR is pressed by the metal cover 70, and the arm 83AR thus elastically deforms in a predetermined direction. Then, once the protrusion 83PR reaches the retaining part 74, the arm 83AR returns from its deformed state, thereby locking the protrusion 83PR to the retaining part 74.

[0142] <3.3 Busbar>

[0143] Next, the busbars 42 in the second structure 1B will be described. The multiple busbars 42 in the second structure 1B include, for example, four busbars 42J, 42K, 42L, and 42M (see...). Figure 10 ).

[0144] The busbar 42 in the second structure 1B that is electrically connected to the electronic component 10T is an example of a "second wiring component". In this embodiment, four busbars 42J, 42K, 42L and 42M are "second wiring components" (see [link to documentation]). Figure 10 ).

[0145] Four busbars 42J, 42K, 42L, and 42M are arranged horizontally and separately from each other. The four busbars 42J, 42K, 42L, and 42M are supported by the wall portion 81 of the cover member 40T. For example, with the movement of the busbars 42 restricted by ribs or the like of the cover member 40T, the four busbars 42 (busbars 42J, 42K, 42L, and 42M) are arranged at intervals in the horizontal direction. The busbars 42 are configured to partially overlap with the second heat transfer member 92B when viewed from the Z direction. This arrangement forms a heat transfer path from the busbars 42 to the metal cover 70 via the second heat transfer member 92B. The busbars 42 are, for example, located directly below the terminals 13 of the electronic component 10.

[0146] In this embodiment, busbars 42K and 42M are plate-shaped, extending horizontally along their entire length. Busbars 42K and 42M include a horizontal plate portion 42p. In this embodiment, the plurality of electronic components 10T includes two electronic components 10C and 10D.

[0147] The four busbars 42J, 42K, 42L, and 42M are wiring components (electrical connection components) at least partially covered by the cover member 40T. For example, the busbars 42 in the second structure 1B are electrically connected to at least one electronic component 10 included in the plurality of electronic components 10T. For example, each of some busbars 42 electrically connects two electronic components 10 included in the plurality of electronic components 10 (e.g., the plurality of electronic components 10T). The plurality of electronic components 10T in the second structure 1B are formed separately from each other in the horizontal direction (e.g., the X direction).

[0148] For example, four busbars 42J, 42K, 42L, and 42M, and multiple electronic components 10T are attached to the cover member 40T from the +Z direction. Fastening members 43 are secured to the four busbars 42J, 42K, 42L, and 42M. Note that the fastening members 43 are similar to those described in the wiring board 40S, therefore repeated descriptions will be omitted. Multiple fastening members 43 can be integrally provided with the cover member 40T by, for example, insert molding. Multiple fastening members 43 can be secured to the cover member 40T by methods other than insert molding.

[0149] The four busbars 42J, 42K, 42L, and 42M are described.

[0150] The first connecting portion 61 of the busbar 42J is attached to the cover member 40T from the +Z direction side, thereby covering the lower surface of the busbar 42J. The first connecting portion 61 of the busbar 42J is physically and electrically connected to the terminal 13A of the electronic component 10C. For example, the terminal 13A of the electronic component 10C is connected to the first connecting portion 61 of the busbar 42J via the fastening member 43 by attaching it from the +Z direction side to the first connecting portion 61.

[0151] The first connecting portion 61 of the busbar 42K is attached to the cover member 40T from the +Z direction side, such that the lower surface of the busbar 42K is partially covered. At this time, a portion of the busbar 42K is exposed from the receiving portion 82 toward the -Z direction. In this embodiment, the second heat transfer member 92B, housed in the receiving portion 82, is disposed directly below the first connecting portion 61 of the busbar 42K. The first connecting portion 61 of the busbar 42K is physically and electrically connected to the terminal 13B of the electronic component 10C via the fastening member 43. The second connecting portion 62 of the busbar 42K is connected to the connecting busbar 47 via the fastening member 43.

[0152] The first connecting portion 61 of the busbar 42L is attached to the cover member 40T from the +Z direction side, such that the lower surface of the busbar 42L is partially covered. The first connecting portion 61 of the busbar 42L is physically and electrically connected to the terminal 13A of the electronic component 10D. For example, the terminal 13A of the electronic component 10D is connected to the first connecting portion 61 of the busbar 42L via the fastening member 43 by attaching it from the +Z direction side.

[0153] The first connecting portion 61 of the busbar 42M is attached to the cover member 40T from the +Z direction side, such that the lower surface of the busbar 42M is partially covered. At this time, a portion of the busbar 42M is exposed from the receiving portion 82 toward the -Z direction. In this embodiment, the second heat transfer member 92B, housed in the receiving portion 82, is disposed directly below the first connecting portion 61 of the busbar 42M. The first connecting portion 61 of the busbar 42M is physically and electrically connected to the terminal 13B of the electronic component 10D via the fastening member 43. The second connecting portion 62 of the busbar 42M is connected to the connecting busbar 47 via the fastening member 43.

[0154] <4. Connect the busbar>

[0155] Next, the connection busbar 47 will be explained.

[0156] like Figure 10 As shown, the connecting busbar 47 is a wiring component used to connect and electrically connect the first structure 1A and the second structure 1B. At least one electronic component 10 of the plurality of electronic components 10S included in the first structure 1A and at least one electronic component 10 of the plurality of electronic components 10T included in the second structure 1B are electrically connected via the connecting busbar 47. In this embodiment, the plurality of connecting busbars 47 includes two connecting busbars 47A and 47B.

[0157] The connecting busbar 47 includes, for example, a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61, the second connecting portion 62, and the extension portion 63 are similar to those described in the wiring board 40S, so repeated descriptions will be omitted.

[0158] The connecting busbar 47A includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. In the connecting busbar 47A, the second connecting portion 62 is located on the -Z direction side of the first connecting portion 61. The extension portion 63 extends from the first connecting portion 61 to the second connecting portion 62 and is partially curved. The second connecting portion 62 of the connecting busbar 47A, together with the busbar 42W, is supported by a first auxiliary member 46.

[0159] The first connecting portion 61 of the connecting busbar 47A is attached from the +Z direction side to the second connecting portion 62 of the busbar 42M, and is connected to the busbar 42M via the fastening member 43. The external connecting busbar 99 is attached from the +Z direction side to the second connecting portion 62 and is connected to the second connecting portion 62 (see [link]). Figure 1 ).

[0160] The connecting busbar 47B includes a first connecting portion 61, a second connecting portion 62, and an extension portion 63. In the connecting busbar 47B, the second connecting portion 62 is located on the -Z direction side of the first connecting portion 61. The extension portion 63 extends from the first connecting portion 61 to the second connecting portion 62 and is partially curved. Due to this curvature, a portion of the connecting busbar 47A (e.g., a portion of the extension portion 63) intersects the connecting busbar 47B in three dimensions.

[0161] The first connecting portion 61 of the busbar 47B is attached from the +Z direction side to the second connecting portion 62 of the busbar 42K, and connected to the busbar 42M via the fastening member 43. The second connecting portion 62 is attached from the +Z direction side to the second connecting portion 62 of the busbar 42G, and connected via the fastening member 43 (see...). Figure 2 ) Connect to busbar 42G.

[0162] <5. Second Auxiliary Component>

[0163] like Figure 10 As shown, when two connecting busbars 47 are attached to busbars 42 (e.g., busbars 42K and 42M) of the second structure 1B, the two connecting busbars 47 can be adjacent to each other in the Z direction. In this case, a second auxiliary member 48 is disposed between the two adjacent connecting busbars 47. The second auxiliary member 48 provides electrical insulation between the two connecting busbars 47 that are adjacent to each other in the Z direction. The second auxiliary member 48 is made of, for example, synthetic resin and has insulating properties. The second auxiliary member 48 is slidable between the two adjacent connecting busbars 47.

[0164] The second auxiliary component 48 includes a support wall 481 and a limiting part 482.

[0165] The support wall 481 is, for example, a plate-shaped wall extending horizontally. The support wall 481 is an insulating wall that electrically insulates between two adjacent connecting busbars 47 in the Z direction. The support wall 481 forms the main part of the second auxiliary member 48. When viewed from the Z direction, the support wall 481 has a shape corresponding to the overlapping area of ​​the two connecting busbars 47.

[0166] The limiting portion 482 is, for example, a rib extending from the support wall 481 along the +Z direction. When viewed from the Z direction, the limiting portion 482 is located off-center from the area where the two connecting busbars 47 overlap. The limiting portion 482 includes a first limiting portion 482A and a second limiting portion 482B. The first limiting portion 482A is a rib extending in the +Z direction, traversing from the -X direction to the +X direction. The second limiting portion 482B is a rib extending in the +Z direction, traversing from the -Y direction to the +Y direction. Due to the presence of the first limiting portion 482A and the second limiting portion 482B, the second auxiliary member 48 slides according to the horizontal movement of one of the two adjacent connecting busbars 47 (e.g., connecting busbar 47A). The second auxiliary member 48 can be provided in an inverted manner. In other words, the limiting portion 482 can be a rib extending from the support wall 481 along the -Z direction.

[0167] <6. Construction of the metal cap>

[0168] Next, the construction of the metal cover 70 will be explained.

[0169] The metal cover 70 is a component used to ensure the rigidity of the electrical connection unit 100 and improve the heat dissipation performance of the electrical connection unit 100. At least a portion of the metal cover 70 is made of metal (e.g., aluminum or aluminum alloy). The metal cover 70 is an example of a "heat dissipation component". The metal cover 70 may be referred to as a "metal component" or a "rigid component".

[0170] like Figure 3 and Figure 11 As shown, in the electrical connection unit 100, the metal cover 70 covers the first structure 1A from the +Z direction. At this time, the lower surface (the second surface 51b of the flat surface portion 51) of the base member 41S of the first structure 1A is exposed without being covered by the metal cover 70. The metal cover 70 only needs to cover most of the main part of the first structure 1A (described later), and a part of the first structure 1A can be exposed through the insertion portion 75.

[0171] The metal cover 70 includes a peripheral wall 71, a top wall portion 72, a plurality of fixing portions 73, one or more retaining portions 74, and an insertion portion 75. The metal cover 70 covers the first structure 1A from the +Z direction, therefore the rigidity of the metal cover 70 is higher than that of the base member 41S. The peripheral wall 71 is plate-shaped, extending from the top wall portion 72 along the -Z direction. When viewed from the X or Y direction, the peripheral wall 71 is opposite to at least one electronic component 10S included in the plurality of electronic components 10S included in the first structure 1A. For example, the peripheral wall 71 may be made of metal in the same way as the top wall portion 72. The peripheral wall 71 is an example of a "second plate portion".

[0172] The peripheral wall 71 includes one or more retaining portions 71h. The retaining portions 71h are used to hold the metal cover 70 and the first structure 1A in a locked state by the locking portion 56. The retaining portions 71h are located corresponding to the locking portion 56. The retaining portions 71h are, for example, openings provided in the peripheral wall 71. The retaining portions 71h can also be recesses provided in the peripheral wall 71. Alternatively, instead of the above example, the retaining portions 71h can be protrusions extending from the peripheral wall 71 in a direction intersecting the extending direction (+Z direction) of the arm portion 56AR. When the locking portion 56 approaches the retaining portion 71h, one end of the peripheral wall 71 presses against the protrusion 56PR, causing the arm portion 56AR to elastically deform in a predetermined direction. Then, once the protrusion 56PR reaches the retaining portion 71h, the arm portion 56AR returns to its deformed state, thereby locking the protrusion 56PR and the retaining portion 71h. In this embodiment, since the retaining portion 71h is an opening, the edges of the protrusion 56PR and the retaining portion 71h are locked. Thus, the first structure 1A remains attached to the metal cover 70 (see...). Figure 2 ).

[0173] The top wall portion 72 is a plate-shaped portion formed within the metal cover 70. The top wall portion 72 is plate-shaped extending horizontally and, when viewed from the Z direction, has a generally rectangular shape extending along the X direction. The top wall portion 72 forms the main part of the metal cover 70. In this embodiment, the top wall portion 72 has a size that covers the entire first structure 1A from the +Z direction. Thus, the multiple electronic components 10S and multiple busbars 42 included in the first structure 1A are covered from above by the top wall portion 72. The top wall portion 72 faces the upper surface of the base member 41S (the first surface 51a of the flat surface portion 51). The top wall portion 72, as the main part of the metal cover 70, is made of metal. The top wall portion 72 is an example of a "first plate portion".

[0174] The insertion portion 75 is a notch or opening in the metal cover 70. When viewed from the Z-direction, the insertion portion 75 has a shape corresponding to the shape of the first auxiliary member 46 supporting the busbar 42 and / or connecting the busbar 47. In this embodiment, some busbars 42 are connected to an external connecting busbar 99 via the insertion portion 75 (see [link to external connection busbar 99]). Figure 1 and Figure 2 The connecting busbar 47 guides the connection between the first structure 1A and the second structure 1B through the insertion part 75 (see...). Figure 1 , Figure 2 In this embodiment, the metal cover 70 includes a plurality of insertion portions 75.

[0175] The top wall portion 72 has a first surface 72a and a second surface 72b. The first surface 72a is a surface pointing in the +Z direction. The first surface 72a is a flat surface extending in the horizontal direction. The first surface 72a faces the plurality of electronic components 10T included in the second structure 1B (see...). Figure 9 The second surface 72b is located on the side opposite to the first surface 72a. The second surface 72b is a surface pointing in the -Z direction. The second surface 72b is a flat surface extending in the horizontal direction. The second surface 72b faces the plurality of electronic components 10S included in the first structure 1A (see...). Figure 9 The thickness direction (plate thickness direction) of the top wall 72 is the Z direction.

[0176] The top wall portion 72 includes a first end portion 72e1, a second end portion 72e2, a third end portion 72e3, and a fourth end portion 72e4 (see [link to relevant documentation]). Figure 3 The first end 72e1 and the second end 72e2 are a pair of ends of the metal cover 70 in the longitudinal direction, spaced apart from each other in the X direction. The third end 72e3 and the fourth end 72e4 are a pair of ends of the metal cover 70 in the transverse direction, spaced apart from each other in the Y direction.

[0177] The fixing part 73 is used to directly fix the electronic components 10S included in the first structure 1A to the metal cover 70, without the base member 41S being inserted therein. The fixing part 73 is provided at a position corresponding to the attachment part 14 of each of the plurality of electronic components 10S when viewed from the Z direction. For example, in this embodiment, the attachment part 14, the fixing part 73, and the opening 53 are arranged on each of the axes AX1, AX2, AX3, and AX4 (see...). Figure 5 , Figure 9 and Figure 11 The fixing part 73 is a columnar or prismatic boss that protrudes along the -Z direction from the top wall part 72 toward each of the plurality of electronic components 10S included in the first structure 1A. For example, the fixing part 73 may be made of metal in the same way as the top wall part 72.

[0178] The fixing part 73 has a fastening member 95 (e.g., screw or bolt, see below) for later description. Figure 10 The attachment hole 73h is inserted. The attachment hole 73h is open in the Z direction. The attachment hole 73h is an insertion hole through which the fastening member 95 passes. The attachment hole 73h is an example of a "first attachment hole".

[0179] In this embodiment, when viewed from the first structure 1A toward the top wall portion 72 (e.g., along any one of axes AX1, AX2, AX3, and AX4), the attachment portion 14 is located in a region offset from the busbar 42 included in the first structure 1A (see [reference]). Figure 5 , Figure 7 , Figure 11 wait).

[0180] (Maintenance Department)

[0181] For example Figure 2 As shown, the retaining part 74 is used to maintain the locked state between the metal cover 70 and the second structure 1B by the locking part 83. The retaining part 74 is in a position corresponding to the locking part 83. The retaining part 74 includes a protrusion 74PR. The protrusion 74PR protrudes from the end of the retaining part 74 in a direction intersecting the extending direction (-Z direction) of the arm 83AR. In this embodiment, the protrusion 74PR protrudes toward the second structure 1B. When the locking part 83 approaches the retaining part 74, the protrusion 74PR presses against the protrusion 83PR, causing the arm 83AR to elastically deform in a predetermined direction. Then, once the protrusion 83PR reaches the retaining part 74, the arm 83AR returns from the deformed state, thereby locking the protrusion 83PR and the protrusion 74PR. Thus, the cover member 40T of the second structure 1B remains attached to the metal cover 70 (see Figure 1 ) state.

[0182] When the part of the first structure 1A that has the main electrical function is the main part of the first structure 1A, the main part of the first structure 1A is formed by the connection between the electronic component 10S and the first connection portion 61 of the busbar 42. In this embodiment, the main part of the first structure 1A is formed by the electronic component 10S and the aforementioned "first wiring member" (see...). Figure 6 At least the main portion of the first structure 1A is disposed on the -Z direction side of the metal cover 70 (see...). Figure 9 At least a major portion of the first structure 1A is disposed on the -Z direction side of the top wall portion 72 of the metal cover 70 (see...). Figure 9 In other words, at least one electronic component 10S included in the plurality of electronic components 10S is disposed on the -Z direction side of the metal cover 70. Furthermore, the busbar 42 of the first structure 1A is located on the side opposite to the top wall portion 72 of the metal cover 70 (the -Z direction side) relative to at least one electronic component 10S included in the plurality of electronic components 10S in the first structure 1A.

[0183] When the part of the second structure 1B that has the main electrical function is designated as the main part of the second structure 1B, the main part of the second structure 1B is formed by the connection between the electronic component 10T and the first connection portion 61 of the busbar 42 (see...). Figure 10 In this embodiment, the main part of the second structure 1B is formed by the electronic component 10T and the aforementioned "second wiring component" (see...). Figure 10 At least a major portion of the second structure 1B is disposed on the +Z direction side of the metal cover 70. In other words, at least one electronic component 10T included in the plurality of electronic components 10T is disposed on the +Z direction side of the metal cover 70. At least a major portion of the second structure 1B is disposed on the +Z direction side of the top wall portion 72 of the metal cover 70. Furthermore, the busbar 42 of the second structure 1B is located on the same side (-Z direction side) as the top wall portion 72 of the metal cover 70 relative to at least one electronic component 10T included in the plurality of electronic components 10T in the second structure 1B.

[0184] <7. Fastening Structure Between the First Structure and the Metal Cover>

[0185] like Figure 11 As shown, the metal cover 70 is positioned to cover the first structure 1A from the +Z direction. Then, the first structure 1A is locked to the metal cover 70 by the locking part 56 of the flat surface portion 51 of the base member 41S and the retaining part 71h of the peripheral wall 71 of the metal cover 70 (see...). Figure 2 After the metal cover 70 is locked to the first structure 1A, the first structure 1A is supported by the metal cover 70 via the retaining part 71h. Figure 11 In the middle, the following was omitted. Figure 3 The first insulating sheet 91A (described later) and the first heat transfer component 92A (described later) are included.

[0186] After locking, the fixing part 73 is located between the attachment part 14 of each of the plurality of electronic components 10S included in the first structure 1A and the top wall part 72. The plurality of electronic components 10S included in the first structure 1A are directly fixed to the metal cover 70 by fastening members 95 passing through the opening 53 of the base member 41S (see...). Figure 2 and Figure 11In other words, in this embodiment, the plurality of electronic components 10 (electronic components 10S) included in the first structure 1A are fixed to the metal cover 70 without the base member 41S sandwiched between them (i.e., the base member 41S is not inserted between them). In other words, each of the plurality of electronic components 10 included in the first structure 1A is individually fixed to the metal cover 70 by a fastening member 95 corresponding to each electronic component 10. In the first structure 1A, the electronic components 10S are electrically connected to the busbar 42 via connecting members 20. Since the plurality of electronic components 10S are directly fixed to the metal cover 70, the connecting members 20 connected to the electronic components 10S and the busbar 42 (the busbar 42 indirectly fixed to the electronic components 10S via other connecting members 20) are suspended in the metal cover 70.

[0187] <8. Connection between the first structure and the second structure>

[0188] Also Figure 10 As shown, the second structure 1B includes multiple busbars 42 disposed on the wall 81, and multiple electronic components 10T are attached to any of the busbars 42 from the +Z direction side. Subsequently, as... Figure 2 As shown, one end of the connecting busbar 47 (connecting busbars 47A and 47B) is connected to any one of the plurality of busbars 42 of the second structure 1B. In this way, the connecting busbar 47 is attached to the second structure 1B.

[0189] Subsequently, the second structure 1B, to which the connecting busbar 47 is attached, is locked to the metal cover 70 via the locking part 83 of the cover member 40T and the retaining part 74 of the metal cover 70. After the metal cover 70 and the second structure 1B are locked, the second structure 1B is supported by the metal cover 70. The other end of the connecting busbar 47 is connected to the busbar 42 of the first structure 1A or an external connecting busbar 99. At this time, in the second structure 1B, since the electronic component 10 and the busbar 42 are not fixed to the cover member 40T, the connecting busbar 47 connected to the busbar 42 of the second structure 1B can move in the horizontal direction. Since the connecting busbar 47 can move in the horizontal direction, the assembly tolerances generated during the assembly of the first structure 1A, the second structure 1B, and the metal cover 70 are absorbed. The first structure 1A and the second structure 1B are electrically connected in a state where the assembly tolerances are absorbed by the connecting busbar 47.

[0190] <9. Insulating sheets and heat transfer components>

[0191] Next, the insulating sheet 91 and the heat transfer component 92 will be described.

[0192] <9.1 Insulating Sheet>

[0193] For example Figure 3As shown, insulating sheet 91 is an insulating component used to insulate busbar 42. Insulating sheet 91 is a sheet extending in a horizontal direction. Insulating sheet 91 is made of synthetic resins such as polyester and polyimide, and has insulating properties.

[0194] Insulating sheet 91 includes a first insulating sheet 91A and a second insulating sheet 91B. Also as... Figure 9 As shown, the first insulating sheet 91A has a shape in the Z direction corresponding to the lower surface (second surface 51b of the flat surface portion 51) of the base member 41S. The first insulating sheet 91A is disposed on the -Z direction side of the first electronic component, and is disposed between the external cooler CM and the wiring board 40S. For example, in this embodiment, the first insulating sheet 91A is attached to the lower surface of the wiring board 40S. The first heat transfer member 92A is disposed directly below the first insulating sheet 91A.

[0195] Instead of the example above, a first insulating sheet 91A is provided between the external cooler CM and the heat transfer member 92 (e.g., the first heat transfer member 92A).

[0196] For example, the first insulating sheet 91A may also have an opening 53 for avoiding the base member 41S (see Figure 2 The first insulating sheet 91A may also have a notch or opening to avoid the head 43b of the fastening member 43. For example, the first insulating sheet 91A may also have a notch or opening to avoid the busbar 42 (e.g., the busbar 42 corresponding to the "horizontal wiring component") supported by the base member 41S. Furthermore, if the first heat transfer member 92A is insulating and the necessary insulation is ensured by the first heat transfer member 92A, the first insulating sheet 91A may be omitted.

[0197] The second insulating sheet 91B is disposed directly below the second heat transfer member 92B. The second heat transfer member 92B is disposed directly below the busbars 42 (busbars 42K, 42M) exposed from the receiving portion 82 along the -Z direction (see...). Figure 10 ).

[0198] For example, the second insulating sheet 91B may also have a notch or opening to avoid the head 43b of the fastening member 43. Furthermore, if the second heat transfer member 92B is insulating, and the necessary insulation is ensured by the second heat transfer member 92B, the second insulating sheet 91B may be omitted.

[0199] <9.2 Heat Transfer Components>

[0200] like Figure 3As shown. The heat transfer member 92 is a component used to transfer the heat generated by the electronic component 10 when energized and / or the heat (Joule heat) generated by the busbar 42 itself when energized to the external cooler CM and / or the metal cover 70. The heat transfer member 92 is, for example, a resilient heat transfer sheet (e.g., a thermally conductive silicon wafer). The heat transfer member 92 is made of a material with a higher thermal conductivity than the base member 41S and the cover member 40T. However, the heat transfer member 92 is not limited to the above example and may be a heat transfer member made of thermally conductive gel or another material.

[0201] The heat transfer component 92 includes a first heat transfer component 92A, a second heat transfer component 92B, a third heat transfer component 92C, and a fourth heat transfer component 92D.

[0202] The first heat transfer member 92A is disposed on the -Z direction side of the electronic component 10S, and is disposed between the electronic component 10S and the external cooler CM. For example, the first heat transfer member 92A is disposed in the Z direction between the busbar 42 connected to the electronic component 10S and the external cooler CM (see...). Figure 9 In this embodiment, the first heat transfer member 92A is partially disposed relative to the wiring board 40S attached to the first insulating sheet 91A. For example, the first heat transfer member 92A is disposed at a position that overlaps with a portion (e.g., the first connection portion 61) of the busbar 42 (e.g., the busbar 42 corresponding to the "horizontal wiring component") supported by the base member 41S when viewed from the Z direction. For example, the first heat conduction member 92A is disposed below or directly below the exposed portion 42u of the busbar 42 (see...). Figure 9 The first heat transfer member 92A transfers heat from the electronic component 10S to the busbar 42 and / or heat generated by the busbar 42 to the external cooler CM. In this way, the busbar 42 of the first structure 1A is thermally connected to the external cooler CM through the first heat transfer member 92A.

[0203] In this embodiment, a portion of the first heat transfer member 92A is positioned at a location that overlaps with the head 43b of the fastening member 43 when viewed from the Z direction, and is in contact with the head 43b of the fastening member 43 (see [link]). Figure 9 In this case, the heat transferred from the terminal 13 of the electronic component 10 to the connecting component 20 is easily transferred from the fastening member 43 to the external cooler CM.

[0204] Furthermore, the first heat transfer member 92A may have a shape corresponding to the lower surface (the second surface 51b of the flat surface portion 51) of the base member 41S and cover the lower surface.

[0205] The second heat transfer member 92B is disposed between the electronic component 10T and the top wall portion 72 of the metal cover 70. For example, the second heat transfer member 92B is disposed directly below the manifold 42 (manifold 42K, 42M) exposed from the receiving portion 82 in the -Z direction (see...). Figure 10 In this embodiment, the second heat transfer member 92B is configured to cover the manifold 42 (manifold 42M, 42K) partially exposed from the receiving portion 82 along the -Z direction (see...). Figure 2 , Figure 10 The second heat transfer member 92B transfers heat from the electronic component 10T to the busbar 42 and / or heat generated by the busbar 42 from the busbar 42 to the metal cover 70. In this way, the busbar 42 of the second structure 1B is thermally connected to the metal cover 70 through the second heat transfer member 92B.

[0206] The third heat transfer member 92C is disposed between the electronic component 10S and the top wall portion 72 of the metal cover 70. For example, the third heat transfer member 92C is disposed directly above the housing 11 of the electronic component 10S (see...). Figure 8 In this embodiment, the third heat transfer member 92C is arranged to fill the gap between the electronic component 10S of the first structure 1A and the top wall portion 72 (see [reference]). Figure 9 The third heat transfer member 92C transfers the heat generated by the electronic component 10S from the housing 11 to the metal cover 70. Thus, the electronic component 10S is thermally connected to the metal cover 70 via the third heat transfer member 92C. The third heat transfer member 92C can be horizontally sandwiched between the electronic component 10S and the peripheral wall 71 of the metal cover 70.

[0207] The fourth heat transfer member 92D is disposed between the connecting member 20 of the first structure 1A and the top wall portion 72 of the metal cover 70. For example, the fourth heat transfer member 92D is disposed directly above the first portion 21 of the connecting member 20 (see...). Figure 8 In this embodiment, the fourth heat transfer member 92D is provided to fill the gap between the connecting member 20 connected to the electronic component 10S and the top wall portion 72 (see [reference]). Figure 9 The fourth heat transfer member 92D transfers the heat generated by the electronic component 10S from the first part 21 to the metal cover 70. Thus, the connecting component 20 is thermally connected to the metal cover 70 via the fourth heat transfer member 92D. The fourth heat transfer member 92D can be horizontally sandwiched between the connecting component 20 and the peripheral wall 71 of the metal cover 70.

[0208] <10. Advantages>

[0209] In this embodiment, the electrical connection unit 100 includes a heat dissipation component (e.g., a metal cover 70), a first electronic component (e.g., electronic component 10S), a first heat transfer component 92A, a second electronic component (e.g., electronic component 10T), and a second heat transfer component 92B. The first electronic component is disposed on a first side (e.g., the -Z direction side) of the heat dissipation component. The first heat transfer component 92A is disposed on the first side (e.g., the -Z direction side) of the first electronic component and is located between the first electronic component and the external cooler CM. The second electronic component is disposed on a second side (e.g., the +Z direction side) of the heat dissipation component. The second heat transfer component 92B is located between the second electronic component and the heat dissipation component.

[0210] With this configuration, heat generated in the first electronic component is released to the external cooler CM via the first heat transfer member 92A. Furthermore, heat generated in the second electronic component is released to the heat dissipation member via the second heat transfer member 92B. Therefore, the thermal performance of the electrical connection unit 100 can be improved.

[0211] For example, heat from the first structure 1A located below the heat dissipation component is released to the external cooler CM via the first heat transfer member 92A. Heat from the second structure 1B located above the heat dissipation component is released to the heat dissipation component via the second heat transfer member 92B.

[0212] In this embodiment, the electrical connection unit 100 further includes a third heat transfer member 92C disposed between the first electronic component and the heat dissipation member. According to this configuration, the first electronic component is thermally connected to the heat dissipation member via the third heat transfer member 92C. Thus, a new heat transfer path from the first electronic component to the heat dissipation member is established via the third heat transfer member 92C. Therefore, cooling of the first electronic component is promoted, and the thermal performance of the electrical connection unit 100 is improved.

[0213] In this embodiment, the first electronic component is fixed to a heat dissipation member. With this configuration, the first electronic component is physically connected to the heat dissipation member located on the +Z direction side. Heat generated in the first electronic component is easily transferred to the heat dissipation member via the attachment portion 14. Therefore, cooling of the first electronic component is promoted, and the thermal performance of the electrical connection unit 100 is improved.

[0214] In this embodiment, the system further includes a connecting member 20 forming a power path from the first electronic component toward the first side, and a fourth heat transfer member 92D disposed between the connecting member 20 and the heat dissipation member. With this configuration, the connecting member 20 forming the power path from the first electronic component is thermally connected to the heat dissipation member via the fourth heat transfer member 92D. Thus, a new heat transfer path from the first electronic component to the heat dissipation member is established via the connecting member 20 and the fourth heat transfer member 92D. Therefore, cooling of the first electronic component is facilitated, and the thermal performance of the electrical connection unit 100 is improved.

[0215] In this embodiment, the electrical connection unit 100 further includes a first wiring member (e.g., busbar 42). The first wiring member is disposed on the side opposite to the heat dissipation member (e.g., the -Z direction side) relative to the first electronic component and is electrically connected to the first electronic component. The first wiring member is thermally connected to an external cooler CM via a first heat transfer member. According to this configuration, heat generated in the first electronic component and / or the first wiring member is released to the external cooler CM via the first heat transfer member 92A. When the first wiring member, which forms a power path with the first electronic component, is thermally connected to the external cooler CM via the first heat transfer member 92A, the thermal performance of the electrical connection unit 100 is improved.

[0216] In this embodiment, the heat dissipation component is made of metal. With this construction, heat is easily transferred to the heat dissipation component, and heat is less likely to be trapped in the electrical connection unit 100. Therefore, the thermal performance of the electrical connection unit 100 can be improved.

[0217] In this embodiment, the heat generated by the first electronic component is greater than that of the second electronic component. With this configuration, the first electronic component, which generates more heat than the second electronic component, can be easily thermally connected to the external cooler CM. Therefore, temperature management can be easily performed for each of the electronic components (the first and second electronic components) in the electrical connection unit 100.

[0218] <11. Modified Example>

[0219] Next, several modified examples will be described. Note that the constructions, except for those described in each modified example below, are the same as those in the above embodiments.

[0220] (First Modification Example)

[0221] The wiring board 40S is not limited to a structure in which the base member 41S and the busbar 42 are integrated by insert molding. For example, the busbar 42 can be provided in the receiving portion 55 after the base member 41S, which has a receiving portion 55 for accommodating the busbar 42, is molded. In this case, the busbar 42 can be fixed to the receiving portion 55 by mating or by means of adhesive. In these cases, potting can be performed to fill the gap between the busbar 42 and the receiving portion 55.

[0222] (Second Modification Example)

[0223] The base of the wiring board 40S is not limited to the base 41S including the plate-shaped flat surface portion 51. The wiring board 40S may be a base having a sheet-like flat surface portion 51 (e.g., an insulating sheet). In this case, the receiving portion 55 may be formed by a portion of the flat surface portion 51 that follows the shape of the busbar 42. In this disclosure, "sheet-like" or "sheet material" is not limited to components with a thickness of 1 mm or more, and components with a thickness of less than 1 mm (so-called films) may also be used.

[0224] (Third Modification Example)

[0225] The connection between the electronic component 10 and the busbar 42 is not limited to the connection using the connecting component 20. The electronic component 10 can be directly connected to the busbar 42 using fastening members (e.g., bolts or screws), welding, etc.

[0226] The above has described several embodiments and modifications. However, the embodiments and modifications are not limited to the examples described above. For example, the above modifications can be implemented in combination with each other.

[0227] Industrial application

[0228] According to the embodiments, the thermal performance of the electrical connection unit can be improved.

[0229] List of reference numerals

[0230] 100 electrical connection units

[0231] 1A First Structure

[0232] 1B Second Structure

[0233] 10, 10S, 10T electronic components

[0234] 13, 13A, 13B terminals

[0235] 14 Attachment

[0236] 14h attachment hole (second attachment hole)

[0237] 20 connecting parts

[0238] 40S wiring board

[0239] 41S base components

[0240] 40T cover components

[0241] 42 busbars

[0242] 46 First Auxiliary Component

[0243] 47, 47A, 47B connecting busbars

[0244] 48 Second auxiliary component

[0245] 51 Flat surface section

[0246] 51a First Surface

[0247] 51b Second Surface

[0248] 53 opening

[0249] 56 Locking Part

[0250] 61 First connecting part

[0251] 62 Second connecting part

[0252] 63 Extension

[0253] 70 Metal Cover (Heat Dissipation Components, Metal Components, and Rigid Components)

[0254] 71 Surrounding Wall

[0255] 71h maintenance section

[0256] 72 Top wall part

[0257] 72a First Surface

[0258] 72b Second Surface

[0259] 72e1 First end

[0260] 72e2 second end

[0261] 72e3 third end

[0262] 72e4 fourth end

[0263] 73 Fixing Part

[0264] 73h Attachment Hole (First Attachment Hole)

[0265] 74 Maintenance Department

[0266] 75 Insertion Section

[0267] 81 wall section

[0268] 82 Accommodation Department

[0269] 83 Locking Part

[0270] 91 insulating sheet

[0271] Heat transfer components 92, 92A, 92B, 92C, and 92D

[0272] 95 Fastening Components

[0273] 99 External Connection Busbars

[0274] R region

[0275] R1 First Region (First Space)

[0276] R2 Second Region (Second Space)

Claims

1. An electrical connection unit, comprising: Heat dissipation components; A first electronic component is disposed on a first side of the heat dissipation member; A first heat transfer member is disposed on a first side of the first electronic component and is configured to be disposed between the first electronic component and an external cooler; A second electronic component is disposed on the second side of the heat dissipation member; and The second heat transfer component is disposed between the second electronic component and the heat dissipation component.

2. The electrical connection unit according to claim 1, further comprising: A third heat transfer component is disposed between the first electronic component and the heat dissipation component.

3. The electrical connection unit according to claim 1, wherein, The first electronic component is fixed to the heat dissipation component.

4. The electrical connection unit according to any one of claims 1 to 3, further comprising: A connecting component that forms a power path from the first electronic component toward the first side; and A fourth heat transfer component is disposed between the connecting component and the heat dissipation component.

5. The electrical connection unit according to any one of claims 1 to 3, further comprising: A first wiring component is disposed on a side opposite to the heat dissipation component and electrically connected to the first electronic component. The first wiring component is configured to be thermally connected to the external cooler via the first heat transfer component.

6. The electrical connection unit according to any one of claims 1 to 3, wherein, The heat dissipation component is made of metal.

7. The electrical connection unit according to any one of claims 1 to 3, wherein, The heat generated by the first electronic component is greater than that generated by the second electronic component.

Images