Bus bar and electrical connection unit

Abstract

The bus bar has a first connection portion and a first extension portion. The first connection portion is connected to a first terminal of an electronic component directly or via a first connection member. The first extension portion extends from the first connection portion. The thickness direction of the first extension portion is set as a first direction, the extension direction of the first extension portion is set as a second direction, and a direction intersecting the first direction and the second direction is set as a third direction. The width of the first connecting part in the third direction is larger than the width of the first extending part in the third direction.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a bus bar and an electrical connection unit. BACKGROUND

[0002] An electrical connection unit having an electronic component and a bus bar electrically connected to the electronic component is known.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2024-037492 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, an improvement in thermal characteristics is expected for the electrical connection unit.

[0008] One embodiment provides a bus bar and an electrical connection unit capable of achieving an improvement in thermal characteristics.

[0009] TECHNICAL MEANS FOR SOLVING THE PROBLEM

[0010] A bus bar of one embodiment has a first connection portion and a first extension portion. The first connection portion is connected to a first terminal of an electronic component directly or via a first connection member. The first extension portion extends from the first connection portion. In a case where a thickness direction of the first extension portion is set to a first direction, an extension direction of the first extension portion is set to a second direction, and a direction intersecting the first direction and the second direction is set to a third direction, a width of the third direction of the first connection portion is greater than a width of the third direction of the first extension portion.

[0011] An electrical connection unit of one embodiment has an electronic component and a bus bar. The bus bar has a first connection portion and a first extension portion. The first connection portion is connected to a first terminal of the electronic component directly or via a first connection member. The first extension portion extends from the first connection portion. In a case where a thickness direction of the first extension portion is set to a first direction, an extension direction of the first extension portion is set to a second direction, and a direction intersecting the first direction and the second direction is set to a third direction, a width of the third direction of the first connection portion is greater than a width of the third direction of the first extension portion.

[0012] EFFECT OF THE INVENTION

[0013] According to one embodiment, an improvement in thermal characteristics can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1is a sectional view showing the electrical connection unit of the embodiment.

[0015] Figure 2 is a perspective view for explaining the main body portion of the embodiment.

[0016] Figure 3 is a perspective view for explaining one subunit of the embodiment.

[0017] Figure 4 is a perspective view showing the electronic component and the connecting component of the embodiment.

[0018] Figure 5 is a perspective view for explaining the wiring substrate of the embodiment.

[0019] Figure 6 is a perspective view showing a part of the wiring substrate of the embodiment, which is exploded.

[0020] Figure 7 is a plan view showing the subunit of the embodiment.

[0021] Figure 8 is a sectional view along the F8-F8 line of the structure shown in Figure 7 .

[0022] Figure 9 is a sectional view along the F9-F9 line of the structure shown in Figure 7 .

[0023] Figure 10 is a plan view for explaining a first shape example of the bus bar of the embodiment.

[0024] Figure 11 is a plan view for explaining a second shape example of the bus bar of the embodiment.

[0025] Figure 12 is a perspective view showing another subunit of the embodiment.

[0026] Figure 13 is a front view showing the electronic component of the embodiment.

[0027] Figure 14 is a perspective view showing the base component of the embodiment.

[0028] Figure 15 is a plan view showing the subunit of the embodiment.

[0029] Figure 16 is a sectional view along the F16-F16 line of the structure shown in Figure 15 .

[0030] Figure 17 is a sectional view along the F17-F17 line of the structure shown in Figure 15The cross-sectional view of the structure shown along line F17-F17.

[0031] Figure 18 It is along Figure 15 The cross-sectional view of the structure shown along line F18-F18.

[0032] Figure 19 This is a cross-sectional view of a sub-unit of a first modified example of the embodiment.

[0033] Figure 20 This is a cross-sectional view of a sub-unit of a second variation of the embodiment.

[0034] Figure 21 This is a cross-sectional view of a sub-unit of a third variation of the embodiment.

[0035] Figure 22 This is a cross-sectional view of a sub-unit of a fourth modified embodiment.

[0036] Figure 23 This is a perspective view showing the connection structure between multiple sub-units in an embodiment.

[0037] Figure 24 It is along Figure 15 The cross-sectional view of the structure shown along line F24-F24. Detailed Implementation

[0038] Hereinafter, embodiments will be described with reference to the accompanying drawings. In the following description, structures having the same or similar functions will be labeled with the same reference numerals. Furthermore, repeated descriptions of these structures will sometimes be omitted. Additionally, the structures described below do not limit the scope of the embodiments.

[0039] In this disclosure, the terms are defined as follows: "Connection" is not limited to mechanical connections, but may include electrical connections. That is, "connection" is not limited to the case where two elements are directly connected, but may also include the case where two elements are connected by intervening other elements. "Containment" is not limited to the case where the entire component is contained, but may also include the case where only a part of the component is contained (the other part of the component protrudes). "Facing" refers to the case where the imaginary projected images of two objects overlap when viewed from a specific direction. That is, "facing" is not limited to the case where two objects directly face each other, but may also include the case where two objects face each other with other components between them. "Parallel," "orthogonal," or "identical" may respectively include cases of "approximately parallel," "approximately orthogonal," or "approximately identical."

[0040] 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 the direction from the first end 110e1 of the metal plate 110 (described later) toward the second end 110e2 (see reference). Figure 2 The -X direction is the opposite of the +X direction. Hereinafter, without distinguishing between the +X and -X directions, it will be simply referred to as the "X direction". The +Y and -Y directions are directions that intersect (e.g., are orthogonal) the X direction. The +Y direction is the direction from the third end 110e3 of the metal plate 110 described later toward the fourth end 110e4 (see reference). Figure 2 The -Y direction is the opposite of 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 direction from the metal plate 110 described later toward the main body MU (see reference). Figure 2 The -Z direction is the opposite of 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 Y direction is an example of the "second direction." The X direction is an example of the "third direction."

[0041] Hereinafter, without distinguishing between the X and Y directions, it will sometimes be referred to as the "horizontal direction". Hereinafter, the Z direction will sometimes be referred to as the "vertical direction". In addition, hereinafter, the +Z direction side will sometimes be referred to as "up" and the -Z direction side will sometimes be referred to as "down". However, these expressions are for ease of explanation and do not limit the direction of gravity of the electrical connection unit 1 (the installation posture of the electrical connection unit 1).

[0042] (Example)

[0043] <1. Structure of the electrical connection unit>

[0044] Figure 1 This is a cross-sectional view illustrating the electrical connection unit 1 of an embodiment. The electrical connection unit 1 is, for example, an on-board device mounted in vehicles such as EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), or PHEVs (Plug-in Hybrid Electric Vehicles). The electrical connection unit 1 may also be referred to as an "electrical connection box" or "junction box." However, the electrical connection unit 1 is not limited to a box-shaped device.

[0045] Electrical connection unit 1, for example, has a frame 5, a main body MU, a metal plate 110, and multiple heat-conducting components 120 (see reference). Figure 2 ) and multiple insulating covers 130 (refer to) Figure 2 ).

[0046] <2. Frame>

[0047] First, the frame 5 will be described. The frame 5 forms the outline of the electrical connection unit 1. The frame 5 includes, for example, a base 6 (first component) and a cover 7 (second component). The base 6 is a component that covers the main body MU and the metal plate 110 from below. The base 6 is, for example, a plate-shaped component along the horizontal direction or a bowl-shaped component that opens in the +Z direction. The base 6 is, for example, made of synthetic resin. The cover 7 is a component that covers the main body MU and the metal plate 110 from above. The cover 7 is, for example, a bowl-shaped component that opens in the -Z direction. The cover 7 is, for example, made of synthetic resin. In this embodiment, a box-shaped frame 5 is formed by combining the base 6 and the cover 7. In addition, the shape of the frame 5 is not limited to the above example. For example, the metal plate 110 described later may also function as part or entirely of the base 6. Alternatively, the frame 5 may be omitted.

[0048] In this embodiment, the electrical connection unit 1 includes a first region (first space) R1 and a second region (second space) R2. The first region R1 is an area where heat dissipation is important. For example, an electronic component 10S that generates a large amount of heat is disposed in the first region R1. On the other hand, the second region R2 is an area where installation is important. For example, an electronic component 10T that generates less heat than the electronic component 10S and / or requires a more complex installation structure than the electronic component 10S is disposed in the second region R2. However, these descriptions do not limit the content of the electrical connection unit 1 of this disclosure. For example, the heat generation of the electronic component 10T may be greater than that of the electronic component 10S.

[0049] <3. Main Body>

[0050] Next, the main body MU will be explained.

[0051] Figure 2 This is a perspective view illustrating the main body MU. The main body MU is the part that performs the main functions of the electrical connection unit 1 (e.g., switching of electrical connection states or overcurrent protection). In this embodiment, the main body MU is divided into multiple sub-units SU. The main body MU is formed, for example, by connecting multiple sub-units SU. In this embodiment, the main body MU has two sub-units SU (sub-units SUS and SUT). Each sub-unit SU can also be referred to as a "circuit structure".

[0052] The subunit SUS has a primary electrical function. The subunit SUS includes, for example, multiple electronic components 10S and a wiring substrate 40S. The multiple electronic components 10S are electrically connected to the wiring substrate 40S. The substrate 41S (described later) included in the subunit SUS is an example of a "first substrate component".

[0053] The subunit SUT has a secondary electrical function. This secondary function is, for example, a function different from the primary function. The subunit SUT includes, for example, multiple electronic components 10T and a wiring structure 40T. The multiple electronic components 10T are electrically connected to the wiring structure 40T. The base component 41T (described later) included in the subunit SUT is an example of a "secondary base component".

[0054] In this embodiment, the sub-unit SUS is a sub-unit SU that prioritizes heat dissipation. The sub-unit SUS is disposed in the first region R1 of the electrical connection unit 1 described above. The sub-unit SUS faces the first region A1 of the metal plate 110, which will be described later, in the Z direction.

[0055] On the other hand, the sub-unit SUT is a sub-unit SU that prioritizes installation. The sub-unit SUT is, for example, disposed on the +Y direction side relative to the sub-unit SUS. The sub-unit SUT is disposed in the second region R2 of the aforementioned electrical connection unit 1. The sub-unit SUT faces the second region A2 of the metal plate 110, which will be described later, in the Z direction. Hereinafter, without distinguishing between electronic component 10S and electronic component 10T, it will be simply referred to as "electronic component 10".

[0056] Furthermore, instead of the above examples, the main body MU may not be divided into multiple sub-units SU. For example, multiple sub-units SU may be formed integrally. For example, the base plate 41S of the wiring substrate 40S and the base component 41T of the wiring structure 40T, which will be described later, may also be formed integrally from a single component.

[0057] <4. Composition of Subunit SUS>

[0058] Next, the structure of the subunit SUS will be explained.

[0059] Figure 3 This is a perspective view illustrating a subunit SUS. The subunit SUS includes, for example, multiple electronic components 10, multiple connecting components 20, and a wiring substrate 40S. The connecting components 20 are components that form vertical power paths. The connecting components 20 can also be referred to as "vertical wiring components."

[0060] <4.1 Electronic Components>

[0061] First, the electronic component 10 will be described. The electronic component 10 is an electronic component mounted according to the functions required by each subunit SU. The electronic component 10 may be, for example, a connector, fuse, relay (e.g., a mechanical relay or a semiconductor relay), capacitor, branch component, various sensors (e.g., current sensors or voltage sensors), electronic control unit, or an electronic component unit composed of two or more of these. However, the type of electronic component 10 is not limited to the examples described above. For example, the electronic component 10 may be a heat-generating component that generates heat when energized.

[0062] In this embodiment, the plurality of electronic components 10 includes electronic components 10S that generate significant heat when energized. Electronic components 10S are relays (e.g., mechanical relays or semiconductor relays), fuses, or current sensors (e.g., current sensors with shunt resistors), etc. However, the types of electronic components 10S are not limited to the examples described above.

[0063] 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 mounting parts 14.

[0064] (case)

[0065] The housing 11 is the outermost part that forms 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 main body 12 of the component. Alternatively, the housing 11 and the main body 12 of the component may be formed integrally.

[0066] In this embodiment, the housing 11 has an insulating rib 11a that protrudes in a horizontal direction (e.g., the Y direction) and extends in a Z direction. The insulating rib 11a is, for example, plate-shaped along both the horizontal (e.g., Y direction) and Z directions. 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. Additionally, 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.

[0067] (Main body of the component)

[0068] The main body 12 of the component is the part that performs the main functions of the electronic component 10S. For example, if the electronic component 10S is a relay, the main body 12 includes a switching part (e.g., a contact part) for switching between on and off states. For example, if the electronic component 10S is a fuse, the main body 12 includes a fuse-breaking part that melts when an overcurrent flows. For example, if the electronic component 10S is a capacitor, the main body 12 includes a part for storing charge.

[0069] (terminal)

[0070] Terminal 13 is an electrical connection portion exposed to the outside of housing 11. Terminal 13 is electrically connected to the main body 12 of component inside housing 11. In this embodiment, electronic component 10S includes terminals 13A and 13B as a plurality of terminals 13. One of terminals 13A and 13B is a terminal on the positive side. The other of terminals 13A and 13B is a terminal on the negative side. 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".

[0071] In this embodiment, terminals 13A and 13B are disposed at one end of the electronic component 10S in the horizontal direction (e.g., the Y direction). Terminals 13A and 13B are arranged side by side in the horizontal direction (e.g., the X direction). Terminals 13A and 13B are respectively oriented towards the horizontal direction (e.g., the Y direction). Each terminal 13 has a mounting hole 13h for mounting with a fastening member 71 (e.g., a screw or bolt) described later. The mounting hole 13h is open in the horizontal direction (e.g., the Y direction). The inner peripheral surface of the mounting hole 13h of the electronic component 10S has a threaded groove.

[0072] (Installation Department)

[0073] Mounting section 14 is a part used to fix electronic component 10S. Mounting section 14 has fastening components 116 (e.g., screws or bolts, see below) for fastening later. Figure 9 The mounting hole 14h is for installation. The mounting hole 14h is open in the Z direction. The mounting hole 14h is a through hole through which the fastening member 116 passes. The object to be fastened to the mounting part 14 will be described later.

[0074] <4.2 Connecting Components>

[0075] Next, the connecting member 20 will be described. The connecting member 20 is a member that electrically connects the electronic component 10S to the wiring substrate 40S. The connecting member 20 forms part of the power path in the sub-unit SUS. 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 "metal component".

[0076] In this embodiment, the connecting member 20 connects the electronic component 10S to the busbar 42 (see reference) included in the wiring substrate 40S. Figure 3 Electrical connection. In this embodiment, the length L12 of the connecting member 20 in the long side direction (e.g., the Y direction) of the electronic component 10S is smaller than the length L11 in the long side direction of the electronic component 10S. The connecting member 20 has, for example, a first portion 21 and a second portion 22.

[0077] (Part 1)

[0078] 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 of the electronic component 10S (e.g., the end in the Y direction). The first portion 21 is an erected portion in the Z direction relative to the wiring substrate 40S (e.g., relative to the busbar 42 described later). The first portion 21 is adjacent to the electronic component 10S in the horizontal direction (e.g., the Y 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 Y direction) and connected to the terminal 13 of the electronic component 10S from the horizontal direction (e.g., the Y direction).

[0079] The first portion 21 of the connecting member 20 has a first mounting hole 21h through which a fastening member 71 (e.g., a screw or bolt) passes. The first mounting hole 21h is open in a horizontal direction (e.g., the Y direction). The first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10S by engaging the fastening member 71 passing through the first mounting hole 21h with the mounting hole 13h of the terminal 13 of the electronic component 10S.

[0080] (Part Two)

[0081] The second part 22 of the connecting component 20 is connected to the busbar 42 (see reference). Figure 3 The second part 22 protrudes horizontally (e.g., in the Y direction) from the end of the first part 21 on the -Z direction side. The second part 22 is a plate portion along the horizontal direction. The second part 22 is adjacent to the busbar 42 in the Z direction and is connected to the busbar 42 from the Z direction. The second part 22 of the connecting member 20 is mounted from the Z direction to a fastening member 43 (e.g., a screw or bolt, see reference 43) protruding from the busbar 42 in the +Z direction. Figure 8 The connector 20 is physically and electrically connected to the busbar 42. In this embodiment, the second portion 22 of the connecting member 20 has a second mounting hole 22h through which the fastening member 43 passes. The second mounting hole 22h is open in the Z direction. The fastening member 43 passes through the second mounting hole 22h of the second portion 22. Furthermore, it is secured by a locking member 44 (e.g., a nut, see...). Figure 3 The first part 21 engages with the end of the fastening member 43 passing through the second mounting hole 22h, thereby fixing the second part 22 to the busbar 42. In this embodiment, the connecting member 20 is an L-shaped piece formed by the first part 21 and the second part 22.

[0082] 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 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 connecting member is positioned between the electronic component and the busbar" can also be equivalent 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.

[0083] <4.3 Substrate for Wiring>

[0084] Next, the wiring substrate 40S will be described.

[0085] Figure 5 This is a perspective view illustrating the wiring substrate 40S. The wiring substrate 40S is a component that forms at least a portion of the power transmission path between a plurality of electronic components 10 (e.g., a plurality of electronic components 10S) and / or at least a portion of the power transmission path between an electronic component 10 (e.g., electronic component 10S) included in a subunit SUS and an electronic component 10 included in another subunit SU (e.g., subunit SUT). In this disclosure, "wiring substrate" refers to a substrate-type wiring structure. "Substrate-type" means that, when viewed as a whole regardless of fine shape, it is plate-shaped along a plane. It should be noted that in this disclosure, "plate-shaped," "sheet-shaped," or "plane" is not limited to a completely flat case, and may include cases where there are fixing structures, ribs, etc., that protrude in the Z direction locally, or cases where there are uneven shapes on the surface that follow the thickness of the busbar, etc. In this embodiment, the wiring substrate 40S is plate-shaped along both the X and Y directions.

[0086] The wiring substrate 40S includes, for example, a base plate 41S, one or more busbars 42, and multiple fastening members 43. In this embodiment, the base plate 41S and the multiple busbars 42 are integrated by insert molding. For example, after the fastening members 43 are fixed to the busbars 42, the busbars 42 are insert molded with the base plate 41S, thereby forming the wiring substrate 40S as a single piece. That is, the busbars 42 are integrated with the base plate 41S without using fastening members such as screws or bolts. Furthermore, the wiring substrate 40S can also be formed by other structures instead of insert molding. A variation of the wiring substrate 40S formed by another structure will be described later.

[0087] Figure 6This is a perspective view showing a portion of the wiring substrate 40S exploded. Hereinafter, for ease of explanation, the substrate 41S, busbar 42, and fastening member 43 will be described with reference to the exploded view of a portion of the wiring substrate 40S.

[0088] <4.3.1 Base plate>

[0089] The substrate plate 41S is a support component that integrally supports a plurality of busbars 42 arranged horizontally at intervals. The substrate plate 41S is, for example, made of synthetic resin and has insulating properties. The substrate plate 41S provides electrical insulation between the plurality of busbars 42. The substrate plate 41S is an example of a "substrate component." The substrate plate 41S can also be referred to as an "insulating substrate." The substrate plate 41S, for example, has a planar portion 51, a frame portion 52, and a plurality of fixing portions 53 (see reference). Figure 9 ).

[0090] (Plane section)

[0091] The planar portion 51 is a plate-shaped portion formed in the base plate 41S. The planar portion 51 is plate-shaped along the horizontal direction. The planar portion 51 forms the main portion of the base plate 41S. The planar portion 51 forms the base (insulating base) of the base plate 41S. In this embodiment, the planar portion 51 extends throughout the entire width of the base plate 41S in the X direction and throughout the entire width of the base plate 41S in the Y direction, except for the frame portion 52 of the base plate 41S.

[0092] The planar portion 51 has a first surface 51a and a second surface 51b (see reference). Figure 9 The first surface 51a is a surface facing the +Z direction. The first surface 51a is a plane along the horizontal direction. The first surface 51a faces multiple electronic components 10 (e.g., multiple electronic components 10S). The second surface 51b is located on the opposite side of the first surface 51a. The second surface 51b is a surface facing the -Z direction. The second surface 51b is a plane along the horizontal direction. The second surface 51b faces the metal plate 110 (see reference). Figure 2 The thickness direction (plate thickness direction) of the planar portion 51 is the Z direction. In this embodiment, the thickness T11 of the planar portion 51 in the Z direction is smaller 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 later) (see reference). Figure 8 In addition, the thickness T11 of the planar portion 51 in the Z direction can be the same as the thickness T1 of the busbar 42 in the Z direction, or it can be larger than the thickness T1 of the busbar 42 in the Z direction.

[0093] The planar portion 51, for example, has one or more receiving portions 55 that respectively receive the busbar 42. The multiple 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 planar portion 51 in the Z direction. It should be noted that the receiving portion 55 may also be a recess provided on the first surface 51a or the second surface 51b of the planar portion 51 and recessed in the Z direction instead of a through hole. It should be noted that in this disclosure, "the receiving portion penetrating the planar portion in the first direction (Z direction)" may include a portion of the total length of the receiving portion 55 penetrating the planar portion 51 in the Z direction (for example, the remaining portion of the receiving portion 55 may be a recessed portion in the Z direction, or it may be a form provided inside the base plate 41S and not exposed to the outside of the base plate 41S). Similarly, in this disclosure, "the receiving portion is recessed in the first direction (Z direction)" may include a portion of the entire length of the receiving portion 55 being recessed in the Z direction (for example, the remaining portion of the receiving portion 55 may be a through hole that penetrates the planar portion 51 in the Z direction, or it may be a form that is provided inside the base plate 41S and does not expose to the outside of the base plate 41S).

[0094] Viewed from the Z-direction, each receiving section 55 has a shape corresponding to the shape of the received busbar 42. The plurality of receiving sections 55 includes, for example, four receiving sections 55A, 55B, 55C, and 55D. Receiving section 55A is provided corresponding to busbar 42A (described later) and receives at least a portion of busbar 42A. Receiving section 55B is provided corresponding to busbar 42B (described later) and receives at least a portion of busbar 42B. Receiving section 55C is provided corresponding to busbar 42C (described later) and receives at least a portion of busbar 42C. Receiving section 55D is provided corresponding to busbar 42D (described later) and receives at least a portion of busbar 42D.

[0095] (Frame)

[0096] The frame portion 52 is provided at the peripheral end of the base plate 41S. The frame portion 52 is a reinforcing rib that protrudes upward and downward from the end of the flat portion 51 (see reference). Figure 8 The width (thickness) H11 in the Z direction of the frame 52 is, for example, less than half the width (thickness) H12 in the Z direction of the electronic component 10 (see reference). Figure 8 Alternatively, the frame 52 can be omitted.

[0097] (Fixed part)

[0098] The fixing part 53 is the part that is fixed to the metal plate 110 (see reference). Figure 9 The fixing part 53 has a mounting hole 53h that penetrates the base plate 41S in the Z direction. The fastening member 115 (e.g., a screw or bolt), described later, passes through the mounting hole 53h. This will be explained later.

[0099] <4.3.2 Busbar>

[0100] Busbar 42 is a wiring component (electrical connection component) included in the wiring substrate 40S. Busbar 42 is, for example, a wiring component for electrically connecting multiple electronic components (e.g., multiple electronic components 10S). Alternatively, busbar 42 can also be a wiring component for electrically connecting electronic components 10 (e.g., electronic components 10S) to electronic components 10 included in other sub-units SU (e.g., sub-units SUT). Busbar 42 is made of metal (e.g., copper, copper alloy, aluminum, or aluminum alloy) and is conductive. In this embodiment, multiple busbars 42 are included, for example, four busbars 42A, 42B, 42C, and 42D. The four busbars 42A, 42B, 42C, and 42D are arranged horizontally with a gap between them. The four busbars 42A, 42B, 42C, and 42D include portions arranged on the same plane. The four busbars 42A, 42B, 42C, and 42D are supported by the flat portion 51 of the base plate 41S. It should be noted that in this disclosure, "the busbars are supported by the flat portion" is not limited to the case where the busbars 42 are housed in the housing portion 55, but may also include cases where the busbars 42 are mounted on the first surface 51a or the second surface 51b of the flat portion 51.

[0101] At least a portion of each busbar 42 is plate-shaped along the horizontal direction. At least a portion of each busbar 42 is housed in a housing portion 55 and extends along a planar portion 51. That is, at least a portion of each busbar 42 extends along a first surface 51a of the planar portion 51. At least a portion of each busbar 42 extends horizontally within the housing portion 55. Hereinafter, the portion of each busbar 42 that extends horizontally in a plate-like shape is sometimes referred to as a "horizontal plate portion 42p". The horizontal plate portion 42p is an example of a "plate portion". The busbar 42 is a component that forms a horizontal power path. The busbar 42 can also be referred to as a "horizontal wiring component".

[0102] Figure 7 This is a top view showing the subunit SUS. Each busbar 42 has, for example, a connecting portion 61, a connecting portion 62, and an extension portion 63.

[0103] The connection portion 61 is located midway through the busbar 42 or at its first end. The connection portion 61 is the part that connects directly to or via the connection member 20 to the electronic component 10 (e.g., electronic component 10S). The connection portion 61 may include, for example, a portion that overlaps with the connection member 20 when viewed from the Z direction. The connection portion 61 is adjacent to and connected to the connection member 20 in the Z direction. Alternatively, the connection portion 61 may also be adjacent to a terminal 13 of the electronic component 10 in the Z direction, and directly connected to the terminal 13 of the electronic component 10 in the Z direction.

[0104] The connection portion 62 is located midway through the busbar 42 or at the second end of the busbar 42. The connection portion 62 is the part that connects directly or via other connecting parts 20 to other electronic components 10. Instead of the above example, the connection portion 62 may be connected to another busbar 42 (e.g., a busbar 42 included in another subunit SU) or to a busbar 76 for external connections (see [link to relevant documentation]). Figure 15 ).

[0105] An extension 63 extends from the connecting portion 61 along the X or Y direction. The extension 63 is disposed between the connecting portion 61 and the connecting portion 62. The extension 63 extends in a manner that extends throughout both the connecting portion 61 and the connecting portion 62. The extension 63 connects the connecting portion 61 and the connecting portion 62.

[0106] In this embodiment, the horizontal plate portion 42p described above includes at least all of the connecting portion 61 and a portion of the extension portion 63. That is, at least all of the connecting portion 61 and a portion of the extension portion 63 are housed in the receiving portion 55 and are located on the same plane.

[0107] In this embodiment, extensions 63 of several busbars 42 are housed in a housing 55, extending through the region R that overlaps with the electronic component 10 when viewed from the Z direction and across both sides of the region R. For example, the extensions 63 extend across the -Y and +Y directions of the region R that overlap with the electronic component 10 when viewed from the Z direction. That is, by being housed in the housing 55, the busbars 42 are not obstructed by the presence of the electronic component 10, and can be easily wired along a better path (e.g., a shorter path).

[0108] In addition to the connecting portion 61, connecting portion 62, and extension portion 63, one or more busbars 42 may also have an extension portion 64. The extension portion 64 is a portion of the busbar 42 extended for the purpose of increasing the heat dissipation area and / or increasing the heat capacity for heat storage (heat absorption). The extension portion 64 is not used for electrical connection. For example, the extension portion 64 is located on the side opposite to the extension portion 63 relative to the connecting portion 61 (or connecting portion 62). The extension portion 64 is plate-shaped along the horizontal direction. The extension portion 64 is included in the horizontal plate portion 42p. The extension portion 64 is received in the receiving portion 55 and extends along the planar portion 51. The extension portion 64 extends to the region R that overlaps with the electronic component 10 when viewed from the Z direction, and has the end portion 42e1 of the busbar 42 at the position where it overlaps with the electronic component 10 when viewed from the Z direction.

[0109] The following describes several examples of the busbar 42 layout. Furthermore, the plurality of electronic components 10S includes three electronic components 10A, 10B, and 10C. The plurality of connecting components 20 includes five connecting components 20A, 20B, 20C, 20D, and 20E.

[0110] Busbar 42A has a connecting portion 61, a connecting portion 62, and an extension portion 63. The connecting portion 61 is connected to the terminal 13A of the electronic component 10A via a connecting member 20A. The connecting portion 62 is disposed at the end of the subunit SUS on the +Y direction side and is connected to the busbars 42 included in other subunits SU. The extension portion 63 is housed in a housing portion 55 and extends across both sides of the region R that overlaps with the electronic component 10A when viewed from the Z direction.

[0111] Busbar 42B has a connecting portion 61, a connecting portion 62, an extension portion 63, and an extension portion 64. The connecting portion 61 is connected to the terminal 13B of the electronic component 10A via a connecting member 20B. The connecting portion 62 is connected to the terminal 13A of the electronic component 10B via a connecting member 20C. When viewed from the Z direction, the extension portion 64 extends to the region R overlapping with the electronic component 10B, and has an end portion 42e1 of the busbar 42 at the position overlapping with the electronic component 10B.

[0112] Busbar 42C has a connecting portion 61, a second connecting portion 62, and an extension portion 63. The connecting portion 61 is connected to the terminal 13B of the electronic component 10B via the connecting member 20D. The connecting portion 62 is disposed at the end of the subunit SUS on the +Y direction side and is connected to the busbars 42 included in other subunits SU.

[0113] Busbar 42D has a connecting portion 61, a connecting portion 62, and an extension portion 63. The connecting portion 61 is connected to the terminal 13A of the electronic component 10C via a connecting member 20E. The connecting portion 62 is disposed at the end of the subunit SUS on the +Y direction side and is connected to the busbars 42 included in other subunits SU.

[0114] (Exposed structures on the upper surface of each busbar)

[0115] In this embodiment, at least a portion of the busbar 42 is exposed on the upper surface side of the base plate 41S. For example, the connecting portion 61, the connecting portion 62, and the extension portion 63 of the busbar 42 are exposed to the outside of the base plate 41S on the upper surface side (first surface 51a side of the planar portion 51). For example, the extension portion 63 of the busbar 42 extends at least along its entire length between the connecting portion 61 and the connecting portion 62 and is exposed to the outside of the base plate 41S on the upper surface side.

[0116] (Exposed structures on the lower surface of each busbar)

[0117] In this embodiment, at least a portion of the busbar 42 is exposed on the lower surface side of the base plate 41S. For example, the entirety of the connecting portion 61 and at least a portion of the extension portion 63 are exposed to the outside of the base plate 41S on the lower surface side (second surface 51b side of the planar portion 51). In this embodiment, a gap S1 is formed between the planar portion 51 of the base plate 41S and the metal plate 110 (see reference). Figure 8 The busbar 42 includes an exposed portion 42u exposed in the gap S1 (see reference). Figure 8 The exposed portion 42u includes, for example, all of the connecting portion 61 and at least a portion of the extension portion 63.

[0118] <4.3.3 Fastening Components>

[0119] Next, the fastening component 43 will be described.

[0120] Figure 8 It is along Figure 7 The diagram shows a cross-sectional view along line F8-F8 of the structure. Fastening component 43 is a component used to secure the busbar 42 and the corresponding connecting component 20. Fastening component 43 is, for example, a riveting bolt fixed to the busbar 42. Fastening component 43 is an example of a "fastening part".

[0121] In this embodiment, at least one of the connecting portion 61 and the connecting portion 62 of the busbar 42 has a through hole 42h. The through hole 42h penetrates the busbar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion 43a and a head 43b. The circumferential surface of the shaft portion 43a has a threaded groove. The diameter of the head 43b is larger than the diameter of the shaft portion 43a. With the shaft portion 43a passing through the through hole 42h of the busbar 42, the head 43b is riveted to the busbar 42. Through this fixation, with the shaft portion 43a protruding from the through hole 42h of the busbar 42 in the +Z direction, the fastening member 43 is electrically and physically connected to the busbar 42. Furthermore, the fastening member 43 is not limited to riveting; it can also be fixed to the busbar 42 by welding or other methods.

[0122] In this embodiment, the connecting member 20 is first fixed to the electronic component 10 by the fastening member 71, and then mounted to the fastening member 43 in the Z direction. For example, the connecting member 20 is used to insert the shaft portion 43a of the fastening member 43 into the second mounting hole 22h of the second part 22. Then, the engaging member 44 (e.g., a nut) engages with the shaft portion 43a of the fastening member 43, which protrudes from the second mounting hole 22h of the second part 22 of the connecting member 20. The engaging member 44 is mounted to the shaft portion 43a in the Z direction. Through this engagement, the second part 22 of the connecting member 20 is fixed to the fastening member 43.

[0123] (Heat-conducting components)

[0124] Here, the heat-conducting component 120 will be described first.

[0125] The thermally conductive component 120 is a component used to transfer heat generated by the electronic component 10 (e.g., electronic component 10S) when energized and / or the heat (Joule heat) generated by the busbar 42 itself when energized to the metal plate 110. The thermally conductive component 120 is, for example, a resilient thermally conductive sheet (e.g., a thermally conductive silicone sheet). The thermally conductive component 120 is, for example, formed of a material with a higher thermal conductivity than the substrate plate 41S (or the substrate component 41T described later). However, the thermally conductive component 120 is not limited to the above examples and may also be a thermally conductive component formed of thermally conductive gel or other materials. In this embodiment, the thermally conductive component 120 is insulating.

[0126] In this embodiment, the heat-conducting component 120 is partially disposed in the wiring substrate 40S (see reference). Figure 2 For example, the heat-conducting component 120 is positioned to overlap a portion of the busbar 42 when viewed from the Z-direction. The heat-conducting component 120 is disposed between the busbar 42 and the planar portion 111 of the metal plate 110 (described later). For example, the heat-conducting component 120 is disposed between the exposed portion 42u of the busbar 42 and the planar portion 111 of the metal plate 110, and contacts both the exposed portion 42u of the busbar 42 and the planar portion 111 of the metal plate 110. The heat-conducting component 120 transfers heat from the electronic component 10 (e.g., electronic component 10S) to the busbar 42 and / or heat emitted by the busbar 42 from the busbar 42 to the planar portion 111 of the metal plate 110.

[0127] In this embodiment, the heat-conducting component 120, when viewed from the Z-direction, is positioned near the electronic component 10 (e.g., electronic component 10S) at a location overlapping a portion of the busbar 42. In this embodiment, the heat-conducting component 120, when viewed from the Z-direction, is positioned at a location overlapping the connecting component 20. In other words, the heat-conducting component 120, when viewed from the Z-direction, is positioned at a location overlapping the connecting portion 61 or the connecting portion 62 of the busbar 42. The heat-conducting component 120 transfers heat moving from the electronic component 10S to the busbar 42 via the connecting component 20 from the busbar 42 to the planar portion 111 of the metal plate 110.

[0128] <4.4 Wiring substrate and electronic component mounting structure>

[0129] Next, the fixing structure of the wiring substrate 40S and the electronic component 10 will be described.

[0130] Figure 9 It is along Figure 7 The structure shown is a cross-sectional view along line F9-F9. The metal plate 110, for example, has a fixing part 112 and a fixing part 113 in addition to the planar part 111 described later.

[0131] The fixing part 112 is used to fix the base plate 41S to the metal plate 110. Viewed from the Z direction, the fixing part 112 is positioned corresponding to the fixing part 53 of the base plate 41S. The fixing part 112 is a cylindrical or prismatic boss protruding from the flat portion 111 of the metal plate 110 in the +Z direction. The fixing part 112 has a locking hole 112h that opens in the +Z direction. The inner circumferential surface of the locking hole 112h has a threaded groove.

[0132] As described above, the fixing part 53 of the base plate 41S has a mounting hole 53h. A fastening member 115 (e.g., a screw or bolt) passes through the mounting hole 53h. When the fastening member 115 passing through the mounting hole 53h of the fixing part 53 of the base plate 41S engages with the engaging hole 112h of the fixing part 112 of the metal plate 110, the base plate 41S is fixed to the metal plate 110.

[0133] The fixing part 113 is used to directly fix the electronic component 10 (e.g., electronic component 10S) to the metal plate 110 without passing through the base plate 41S. Viewed from the Z direction, the fixing part 113 is positioned corresponding to the mounting part 14 of the electronic component 10. The fixing part 113 is a cylindrical or prismatic boss protruding from the flat part 111 in the +Z direction. The fixing part 113 has a locking hole 113h that opens in the +Z direction. The inner circumferential surface of the locking hole 113h has a threaded groove.

[0134] In this embodiment, the planar portion 51 of the substrate 41S has a through hole 51h. The through hole 51h penetrates the planar portion 51 in the Z direction. When viewed from the Z direction, the through hole 51h is located at a position corresponding to the fixing portion 113 of the metal plate 110. The fixing portion 113 of the metal plate 110 protrudes through the through hole 51h of the substrate 41S to a position at the same location as the first surface 51a of the planar portion 51, or at a position closer to the +Z direction side than the first surface 51a of the planar portion 51. The mounting portion 14 of the electronic component 10 contacts the fixing portion 113 at a position at the same location as the first surface 51a of the planar portion 51, or at a position closer to the +Z direction side than the first surface 51a of the planar portion 51.

[0135] A fastening member 116 (e.g., a screw or bolt) passes through the mounting hole 14h of the mounting portion 14 of the electronic component 10 from the +Z direction side. When the fastening member 116 passing through the mounting hole 14h of the mounting portion 14 of the electronic component 10 engages with the engaging hole 113h of the fixing portion 113 of the metal plate 110, the electronic component 10 is fixed to the metal plate 110 without passing through the base plate 41S. Alternatively, instead of the above example, the electronic component 10 may also be fixed to a fixing portion provided on the base plate 41S.

[0136] <5. Examples of busbar shapes>

[0137] Next, the shape of the busbar 42 will be described.

[0138] <5.1 Example of the first shape of a busbar>

[0139] Figure 10 This is a top view illustrating a first shape example of the busbar 42. In this embodiment, the busbar 42A is an example of a "first busbar". The connecting portion 61 of the busbar 42A is an example of a "first connecting portion". The extension portion 63 of the busbar 42A includes a first straight portion 63a extending from the connecting portion 61 of the busbar 42A in the Y direction and a second straight portion 63b bent from the first straight portion 63a and extending in the X direction. The first straight portion 63a of the busbar 42A is an example of a "first extension". The connecting member 20A is an example of a "first connecting member".

[0140] The width W11 in the X direction of the connecting portion 61 of the busbar 42A is greater than the width W12 in the X direction of the extension portion 63 of the busbar 42A (e.g., the width W12 in the X direction of the first straight portion 63a). In this embodiment, the connecting portion 61 and the first straight portion 63a of the extension portion 63 are housed in the housing portion 55. Furthermore, inside the housing portion 55, the width W11 in the X direction of the connecting portion 61 of the busbar 42A is greater than the width W12 in the X direction of the extension portion 63 of the busbar 42A. Width W11 is, for example, the minimum width in the X direction of the connecting portion 61. Width W12 is, for example, the minimum width in the X direction of the extension portion 63 (e.g., the minimum width in the X direction of the first straight portion 63a).

[0141] In this embodiment, the width W12 in the X direction of the extension 63 of the busbar 42A (for example, the width W12 in the X direction of the first straight portion 63a) and the width W13 in the X direction of the connecting member 20A (refer to...) Figure 7 The width of the connecting portion 61 in the X direction is the same as or smaller than that of the connecting member 20A. On the other hand, the width W11 of the connecting portion 61 in the X direction is larger than the width W13 of the connecting member 20A in the X direction. The width W13 is, for example, the minimum width of the connecting member 20A in the X direction.

[0142] The connecting portion 61 has an edge 61e1 extending in the Y direction and an edge 61e2 located on the opposite side of edge 61e1 in the X direction and extending in the Y direction. Edge 61e1 is an example of a "first edge". Edge 61e2 is an example of a "second edge".

[0143] The extension 63 (e.g., the first straight section 63a) has an edge 63e1 extending in the Y direction and an edge 63e2 located on the opposite side of edge 63e1 in the X direction and extending in the Y direction. Edge 63e1 is an example of a "third edge". Edge 63e2 is an example of a "fourth edge".

[0144] In this embodiment, the edges 61e1 of the connecting portion 61 and 63e1 of the extension portion 63 are continuous in a straight line in the Y direction. On the other hand, there is a step 42st in the X direction between the edge 61e2 of the connecting portion 61 and the edge 63e2 of the extension portion 63.

[0145] In this embodiment, busbar 42B is an example of a "second busbar". The connecting portion 61 of busbar 42B is an example of a "second connecting portion". The extension portion 63 of busbar 42B includes a first straight portion 63a extending from the connecting portion 61 of busbar 42B in the Y direction and a second straight portion 63b bent from the first straight portion 63a and extending in the X direction. The first straight portion 63a of the extension portion 63 of busbar 42B is an example of a "second extension". The connecting member 20B is an example of a "second connecting member".

[0146] In this embodiment, the width W21 of the connecting portion 61 of the busbar 42B in the X direction is larger than the width W22 of the extension portion 63 of the busbar 42B in the X direction (e.g., the width W22 of the first straight portion 63a in the X direction). In this embodiment, the connecting portion 61 and the first straight portion 63a of the extension portion 63 are housed in the housing portion 55. Furthermore, inside the housing portion 55, the width W21 of the connecting portion 61 of the busbar 42B in the X direction is larger than the width W22 of the extension portion 63 of the busbar 42B in the X direction. The width W21 is, for example, the minimum width of the connecting portion 61 in the X direction. The width W22 is, for example, the minimum width of the extension portion 63 in the X direction (e.g., the minimum width of the first straight portion 63a in the X direction).

[0147] like Figure 10 As shown, the connecting portion 61 of busbar 42A and the connecting portion 61 of busbar 42B are adjacent in the X direction. The first straight portion 63a of the extension portion 63 of busbar 42A and the first straight portion 63a of the extension portion 63 of busbar 42B are adjacent in the X direction. Furthermore, in this embodiment, the connecting portion 61 of busbar 42A protrudes relative to the first straight portion 63a of the extension portion 63 of busbar 42A towards the side opposite to busbar 42B (-X direction side). On the other hand, the connecting portion 61 of busbar 42B protrudes relative to the first straight portion 63a of the extension portion 63 of busbar 42B towards the side opposite to busbar 42A (+X direction side).

[0148] In this embodiment, the width W11 of the connecting portion 61 of busbar 42A in the X direction is the same as the width W21 of the connecting portion 61 of busbar 42B in the X direction. On the other hand, the width W12 of the extension portion 63 of busbar 42A in the X direction is smaller than the width W22 of the extension portion 63 of busbar 42B in the X direction. Busbar 42B, for example, has greater heat dissipation or heat storage capacity compared to busbar 42A.

[0149] In this embodiment, the heat-conducting component 120 has a size that extends across the connecting portions 61 of busbar 42A and busbar 42B. For example, when viewed from the Z direction, the heat-conducting component 120 overlaps with the connecting portions 61 of busbar 42A and busbar 42B. The heat-conducting component 120 thermally connects busbar 42A and busbar 42B. Therefore, when the temperature of busbar 42B is lower than the temperature of busbar 42A, a portion of the heat from busbar 42A moves to busbar 42B via the heat-conducting component 120. With this structure, the heat dissipation performance of the electrical connection unit 1 can be further improved by homogenizing the heat of the multiple busbars 42.

[0150] <5.2 Example of the second shape of the busbar>

[0151] Figure 11 This is a top view illustrating a second shape example of busbar 42. In this embodiment, electronic component 10A is an example of a "first electronic component." Electronic component 10B is an example of a "second electronic component." Connecting portion 61 of busbar 42B is an example of a "first connecting portion." Connecting portion 62 of busbar 42B is an example of a "second connecting portion." In this embodiment, the extension 63 of busbar 42B, for example, has a first straight portion 63a, a second straight portion 63b, and a third straight portion 63c.

[0152] The first straight section 63a extends from the connecting section 61 in a direction different from the direction from the connecting section 61 of the busbar 42B toward the connecting section 62 with the shortest distance. The first straight section 63a extends, for example, in the Y direction. The first straight section 63a is an example of a "first extension".

[0153] The first straight section 63a includes a first end portion (first part) 63aa connected to the connecting part 61 and a second end portion (second part) 63ab located on the side opposite to the first end portion 63aa. For example, the first end portion 63aa is located on the -Y direction side relative to the connecting part 62 in the extending direction (Y direction) of the first straight section 63a. On the other hand, the second end portion 63ab is located on the side opposite to the first end portion 63aa (+Y direction side) relative to the connecting part 62 in the extending direction (Y direction) of the first straight section 63a.

[0154] In this embodiment, at least a portion of the first straight section 63a overlaps with the electronic component 10A in the Z direction. For example, the region R in which the first straight section 63a overlaps with the electronic component 10A when viewed from the Z direction extends across the -Y and +Y directions of the region R.

[0155] The second straight section 63b extends from the second end 63ab of the first straight section 63a toward the connecting portion 62. However, the second straight section 63b extends from the second end 63ab in a direction different from the direction from the second end 63ab of the first straight section 63a toward the connecting portion 62 of the busbar 42B with the shortest distance. The second straight section 63b bends from the first straight section 63a and extends in the X direction. The second straight section 63b is an example of a "second extension". When viewed from the Z direction, the second straight section 63b does not overlap with any electronic component 10.

[0156] The third straight section 63c extends from the second straight section 63b toward the connection portion 62 of the busbar 42B. The third straight section 63c extends, for example, along the Y direction. In other words, the third straight section 63c extends parallel to the first straight section 63a. The third straight section 63c is an example of a "third extension".

[0157] In this embodiment, the connecting portion 61, connecting portion 62, first straight portion 63a, second straight portion 63b, and third straight portion 63c of the busbar 42B are included in the horizontal plate portion 42p and are located on the same plane. The connecting portion 61, connecting portion 62, first straight portion 63a, second straight portion 63b, and third straight portion 63c of the busbar 42B are, for example, housed in the housing portion 55.

[0158] In this embodiment, the width W23 in the Y direction of the second straight section 63b of the busbar 42B is greater than the width W22 in the X direction of the first straight section 63a of the busbar 42B. Width W22 is, for example, the width in the X direction of the portion of the busbar 42B located in the region R overlapping with the electronic component 10A when viewed from the Z direction. Width W22 is, for example, the minimum width in the X direction of the first straight section 63a. Width W23 is, for example, the minimum width in the Y direction of the second straight section 63b.

[0159] In this embodiment, at least a portion (e.g., all) of the first straight section 63a and at least a portion (e.g., all) of the second straight section 63b are housed in the housing section 55. Furthermore, inside the housing section 55, the width W23 of the second straight section 63b in the Y direction is greater than the width W22 of the first straight section 63a in the X direction.

[0160] In another viewpoint, in this embodiment, the width W23 of the second straight portion 63b of the busbar 42B in the Y direction is greater than the width W13 of the connecting member 20B in the X direction (see reference). Figure 7 )big.

[0161] <6. Structure of Subunit SUT>

[0162] Next, the structure of the subunit SUT will be explained.

[0163] Figure 12 This is a perspective view showing the subunit SUT. The subunit SUT includes, for example, multiple electronic components 10, wiring structures 40T, and auxiliary base components 101 (see reference). Figure 16 ) and metal part 90 (refer to) Figure 14 ).

[0164] <6.1 Electronic Components>

[0165] First, the electronic component 10 will be described. The plurality of electronic components 10 includes a plurality of electronic components 10TA (in... Figure 12 (Only one is shown in the image) and multiple electronic components totaling 10TB (in Figure 12 (Only one is shown in the figure). In addition, the multiple electronic components 10 may also have only one of electronic component 10TA and electronic component 10TB.

[0166] Electronic component 10TA is an example of the aforementioned electronic component 10T. Electronic component 10TA generates less heat when energized than electronic component 10S. On the other hand, electronic component 10TB is another example of the aforementioned electronic component 10T. Electronic component 10TB is an electronic component with poorer mounting characteristics (e.g., requiring a complex implementation structure) compared to electronic component 10S. Electronic component 10TB, for example, has a terminal 13 protruding in the -Z direction toward the planar portion 111 of the metal plate 110 (see reference). Figure 16 The electronic component 10TB generates less heat when powered on, for example, than the electronic component 10S.

[0167] Hereinafter, without distinguishing between electronic component 10TA and electronic component 10TB, it will be referred to simply as "electronic component 10T". Electronic component 10T may also be, for example, a connector, fuse, capacitor, branch component, 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 mentioned above.

[0168] Figure 13This is a front view showing the electronic component 10TA. The electronic component 10TA is, for example, an electronic component with multiple terminals 13 arranged at both ends in the horizontal direction of the electronic component 10TA. In this embodiment, terminals 13A and 13B are separately arranged at both ends in the Y direction of the electronic component 10TA. Terminals 13A and 13B protrude from the center of the housing 11 in the Z direction towards the horizontal direction (e.g., the +Y direction or the -Y direction). Each terminal 13 has a mounting hole 13h through which a fastening member 43 (e.g., a screw or bolt) passes. The mounting hole 13h is open in the Z direction.

[0169] <6.2 Wiring Structure>

[0170] Next, return Figure 12 The wiring structure 40T will be described below. The wiring structure 40T is a component that forms at least a portion of the power path between multiple electronic components 10 (e.g., multiple electronic components 10T) and / or at least a portion of the power path between electronic components 10 (e.g., electronic components 10T) included in a subunit SUT and electronic components 10 included in other subunits SU (e.g., subunit SUS). The wiring structure 40T includes, for example, a base component 41T, one or more busbars 42, and multiple fastening components 43. Regarding the fastening components 43, since the content is the same as that described in the subunit SUS, repeated descriptions are omitted.

[0171] <6.2.1 Base Components>

[0172] Figure 14 This is a perspective view showing the base component 41T. The base component 41T is a support component that integrally supports a plurality of busbars 42 arranged horizontally and spaced apart from each other. The base component 41T is made of, for example, synthetic resin and has insulating properties. The base component 41T electrically insulates the plurality of busbars 42, for example, by ribs (not shown). The base component 41T can also be referred to as an "insulating substrate". The base component 41T has a three-dimensional structure that is thicker in the Z direction than the base plate 41S included in the subunit SUS. The base component 41T includes, for example, a support wall 81, a frame portion 85 (peripheral wall portion), and a fixing portion 87.

[0173] (Supporting wall)

[0174] The support wall 81 is, for example, a plate-like wall section along the horizontal direction. Multiple busbars 42 are disposed on the support wall 81 and supported from below by the support wall 81 (see reference). Figure 12Furthermore, the support wall 81 supporting the busbar 42 is not limited to a wall portion along the horizontal direction, but may also be a grid-like wall portion formed by multiple ribs extending in the Z direction. In this embodiment, a fastening member 43 is installed on the support wall 81. The fastening member 43 protrudes from the support wall 81 in the +Z direction.

[0175] (Containment section for electronic components)

[0176] In this embodiment, the base component 41T has a receiving portion 84A that opens towards the +Z direction. The receiving portion 84A is, for example, a recess in the Z direction of a part of the support wall 81, or a through hole that penetrates the support wall 81 in the Z direction. When viewed from the Z direction, the receiving portion 84A has a shape corresponding to the shape of the housing 11 (i.e., the main body portion 12) of the electronic component 10 (e.g., the electronic component 10T). At least a portion of the electronic component 10 (e.g., the electronic component 10T) (e.g., at least a portion of the main body portion 12) is received in the receiving portion 84A. At least a portion of the electronic component 10 received in the receiving portion 84A is located on the -Z direction side compared to the support wall 81.

[0177] (The containment department of the metal containment unit)

[0178] In this embodiment, the base component 41T has a receiving portion 84B that opens towards the +Z direction. The receiving portion 84B is, for example, a recess in the Z direction of a portion of the support wall 81, or a through hole extending through the support wall 81 in the Z direction. When viewed from the Z direction, the receiving portion 84B has a shape corresponding to the shape of the metal portion 90 described later. At least a portion of the metal portion 90 is received in the receiving portion 84B. The at least portion of the metal portion 90 received in the receiving portion 84B is located on the -Z direction side compared to the support wall 81.

[0179] (Frame)

[0180] A frame portion 85 is provided at the peripheral end of the base member 41T. The frame portion 85 is a rib (peripheral wall portion) extending in the Z direction at the peripheral end of the base member 41T. The width (thickness) H21 of the frame portion 85 (peripheral wall portion) in the Z direction is, for example, more than half of the width (thickness) H22 in the Z direction of the electronic component 10 (e.g., electronic component 10TA) (see reference). Figure 16 Additionally, the frame 85 can also be omitted.

[0181] (Fixed part)

[0182] The fixing part 87 is the part that is fixed to the metal plate 110 (see reference). Figure 16The fixing part 87 faces the fixing part 112 of the metal plate 110 in the Z direction. The fixing part 87 has a mounting hole 87h that passes through the base member 41T in the Z direction. The fastening member 115 (e.g., a screw or bolt) passes through the mounting hole 87h. When the fastening member 115 passing through the mounting hole 87h engages with the engaging hole 112h of the fixing part 112 of the metal plate 110, the base member 41T is fixed to the metal plate 110.

[0183] <6.2.2 Busbar>

[0184] Next, the busbar 42 included in the wiring structure 40T will be described.

[0185] Figure 15 This is a top view showing the subunit SUT. Busbar 42 is a wiring component (electrical connection component) included in the wiring structure 40T. Busbar 42 is, for example, a wiring component for electrically connecting multiple electronic components 10 (e.g., multiple electronic components 10T). Alternatively, busbar 42 can also be a wiring component for connecting electronic components 10 (e.g., electronic components 10T) to electronic components 10 included in other subunits SU (e.g., subunit SUS). In this embodiment, multiple busbars 42 are supported from below by the base component 41T and are positioned away from the metal plate 110. Busbar 42 is, for example, positioned directly below the terminals 13 of the electronic components 10. The busbar 42 overlaps with the component body 12 of the electronic components 10 when viewed from the X or Y direction (see reference). Figure 17 ).

[0186] The plurality of busbars 42 includes, for example, four busbars 42E, 42F, 42G, and 42I. The four busbars 42E, 42F, 42G, and 42I are arranged horizontally with intervals between them. The four busbars 42E, 42F, 42G, and 42I include portions arranged on the same plane. At least a portion of each busbar 42 is a horizontal plate portion 42p. In this embodiment, each busbar 42 is plate-shaped, extending horizontally along its entire length. The horizontal plate portion 42p of each busbar 42 includes a connecting portion 61, a connecting portion 62, and an extension portion 63. Furthermore, in this embodiment, the sub-unit SUT has an electronic component 10D as one of the electronic components 10TA.

[0187] The connecting portion 61 of busbar 42E is connected to the busbar 42 included in subunit SUS. Similarly, the connecting portion 61 of busbar 42F is connected to the busbar 42 included in subunit SUS. The connecting portion 62 of busbar 42F is physically and electrically connected to the terminal 13A of electronic component 10D. For example, the terminal 13A of electronic component 10D is mounted on the horizontal plate portion 42p of busbar 42F, thereby connecting to the connecting portion 62 of busbar 42F.

[0188] The connecting portion 61 of busbar 42G is physically and electrically connected to the terminal 13B of electronic component 10D. For example, the terminal 13B of electronic component 10D is connected to the connecting portion 61 of busbar 42G via a horizontal plate portion 42p mounted on busbar 42G. The connecting portion 61 of busbar 42G is an example of a "first connecting portion". The connecting portion 62 of busbar 42G is physically and electrically connected to the external connecting busbar 76. The connecting portion 62 of busbar 42G is connected to an external device via busbar 76. The connecting portion 62 of busbar 42G is an example of a "second connecting portion". Busbar 76 is an example of an "external connecting component". Alternatively, the connecting portion 62 of busbar 42G can also replace busbar 76 for physical and electrical connection to the terminals 13 of other electronic components 10.

[0189] The connecting portion 61 of busbar 42I is connected to busbar 42 included in subunit SUS. The connecting portion 62 of busbar 42I is physically and electrically connected to terminal 13A of electronic component 10T (not shown).

[0190] <6.3 Auxiliary Base Components>

[0191] Next, the auxiliary base component 101 will be described.

[0192] Figure 16 It is along Figure 15 The diagram shows a cross-sectional view along line F16-F16 of the structure. The auxiliary substrate component 101 is made of, for example, synthetic resin and is insulating. A plurality of wirings 102 are provided on the surface of the auxiliary substrate component 101. The wirings 102 are, for example, conductive layers (metal layers) provided on the surface of the auxiliary substrate component 101. The auxiliary substrate component 101 is disposed in the Z direction between the substrate component 41T and the planar portion 111 of the metal plate 110. The auxiliary substrate component 101 extends laterally towards the electronic component 10TB in the -Z direction. The terminals 13 of the electronic component 10TB are electrically connected to the wirings 102 provided on the auxiliary substrate component 101 at a position between the substrate component 41T and the planar portion 111 of the metal plate 110. The auxiliary substrate component 101 is an example of a "third substrate component".

[0193] <6.4 Metal Department>

[0194] <6.4.1 Structure of the Metal Part>

[0195] Next, refer to Figure 14 The metal part 90 will be described below. The metal part 90 is, for example, a structure that reduces thermal interference from external devices to the electronic components 10 contained in the subunit SUT.

[0196] The metal portion 90 is, for example, a heat-conducting portion that transfers a portion of the heat from an external device via the busbar 76 toward the electronic component 10 (e.g., electronic component 10T) to the planar portion 111 of the metal plate 110, described later. Alternatively, the metal portion 90 may also be a heat-conducting portion that transfers at least a portion of the heat emitted by the electronic component 10 and / or at least a portion of the heat emitted by the busbar 42 itself to the planar portion 111 of the metal plate 110. The planar portion 111 of the metal plate 110 is disposed separately from the busbar 42 in the Z direction. The planar portion 111 of the metal plate 110 faces the busbar 42 in the Z direction. The planar portion 111 of the metal plate 110 is an example of an "opposite portion".

[0197] The metal part 90 is, for example, a heat storage component (heat absorption component) that increases the heat capacity of the electrical path included in the subunit SUT. The metal part 90, for example, stores (absorbs) a portion of the heat from an external device via the busbar 76 toward the electronic component 10 (e.g., electronic component 10T). Alternatively, the metal part 90 may also store (absorb) at least a portion of the heat emitted by the electronic component 10 and / or at least a portion of the heat emitted by the busbar 42 itself. When using the metal part 90 as a heat storage component, the metal part 90 may not be thermally connected to the metal plate 110.

[0198] Figure 17 It is along Figure 15 The cross-sectional view of the structure shown along line F17-F17. Figure 18 It is along Figure 15 The diagram shows a cross-sectional view along line F18-F18 of the structure. In this embodiment, the metal part 90 and the metal plate 110 are separate components. The metal part 90 is, for example, a solid metal block. Furthermore, the shape of the metal part 90 is not limited to the example described above. The metal part 90 can also be a component with an I-shaped, L-shaped, or C-shaped cross-sectional shape. The metal part 90 can also be integrally formed with the base component 41T by insert molding.

[0199] The thickness H31 of the metal part 90 in the Z direction is greater than the thickness T1 of the horizontal plate part 42p of the busbar 42 in the Z direction. For example, the thickness H31 of the metal part 90 in the Z direction is more than twice the thickness T1 of the horizontal plate part 42p of the busbar 42 in the Z direction.

[0200] In this embodiment, the width W31 of the metal part 90 in the X direction is larger than the width W32 of the electronic component 10 in the X direction (see reference). Figure 15 In other viewpoints, the width W31 in the X direction of the metal part 90 (see reference) Figure 15 The thickness H31 in the Z direction of the metal part 90 is greater than that of the metal part 90 (refer to...). Figure 18 ).

[0201] In this embodiment, the base component 41T is disposed between the busbar 42 and the planar portion 111 of the metal plate 110. The base component 41T has a receiving portion 84B that opens in the Z direction. At least a portion of the metal portion 90 is received in the receiving portion 84B.

[0202] The metal part 90 is disposed in the Z direction between the busbar 42 and the flat part 111 of the metal plate 110. The metal part 90 faces the busbar 42 from the Z direction and is thermally connected to the busbar 42.

[0203] In this embodiment, the metal part 90 is disposed, for example, between the extension 63 of the busbar 42 and the planar part 111 of the metal plate 110. The metal part 90 faces the extension 63 of the busbar 42 from the Z direction and is thermally connected to the extension 63 of the busbar 42.

[0204] In this embodiment, the metal part 90 has a locking hole 90h opening in the +Z direction. The inner circumferential surface of the locking hole 90h has a threaded groove. The extension 63 of the busbar 42 has a through hole 42h opposite to the locking hole 90h. A fastening member 117 (e.g., a screw or bolt) passes through the through hole 42h of the busbar 42 from the +Z direction side. When the fastening member 117 passing through the through hole 42h of the busbar 42 engages with the locking hole 90h of the metal part 90, the extension 63 of the busbar 42 is fixed to the metal part 90.

[0205] In this embodiment, a heat-conducting member 120 is disposed between the metal part 90 and the planar part 111 of the metal plate 110. Alternatively, the heat-conducting member 120 may be disposed between the metal part 90 and the busbar 42.

[0206] like Figure 15 As shown, when viewed from the Z direction, the metal part 90 is disposed between the terminal 13B of the electronic component 10 and the busbar 76 for external connection. Therefore, heat from the busbar 76 toward the electronic component 10 via the busbar 42 can easily move to the metal part 90 before reaching the electronic component 10.

[0207] The metal portion 90 includes, for example, a first portion 91 and a second portion 92. Viewed from the Z direction, the first portion 91 is located on the +Y direction side relative to the terminal 13B of the electronic component 10. Viewed from the Z direction, the second portion 92 is located on the -X direction side or the +X direction side relative to the terminal 13B of the electronic component 10. The first portion 91 and the second portion 92 are integrally formed. With this structure, it is easier to ensure a larger volume of the metal portion 90 compared to a cuboid shape.

[0208] <6.4.2 Examples of Deformations in the Metal Part>

[0209] Next, a modified example of the metal part 90 will be described. Furthermore, in each modified example, the structure other than that described below is the same as the structure of the first embodiment.

[0210] (First variation)

[0211] Figure 19 This is a cross-sectional view showing the subunit SUT of the first modified example. In the above embodiment, the metal part 90 is thermally connected to the metal plate 110 and functions as a heat-conducting part. On the other hand, in this modified example, the metal part 90 is not thermally connected to the metal plate 110. The metal part 90 functions as a heat storage member (heat-absorbing member). For example, a portion of the base member 41T is provided between the metal part 90 and the metal plate 110.

[0212] (Second variation)

[0213] Figure 20 This is a cross-sectional view showing the subunit SUT of the second modified example. In the above embodiment, the metal part 90 and the metal plate 110 are formed separately. On the other hand, in this modified example, the metal part 90 and the metal plate 110 are formed as a single piece. The metal part 90 is provided as part of the metal plate 110 and is integrally formed with the planar part 111. The metal part 90 is a protrusion that protrudes from the planar part 111 toward the busbar 42. Figure 20 In the example shown, the heat-conducting component 120 is disposed between the metal part 90 and the busbar 42.

[0214] (Third variation)

[0215] Figure 21 This is a cross-sectional view of the subunit SUT showing the third modified example. In this modified example, the metal part 90 is provided by deforming a portion of the planar part 111 of the metal plate 110 towards the +Z direction using a stamping process or the like. In this modified example, the metal part 90 is also provided as part of the metal plate 110 and is integrally formed with the planar part 111. The metal part 90 is a protrusion that projects from the planar part 111 toward the busbar 42. Figure 21 In the example shown, the heat-conducting component 120 is disposed between the metal part 90 and the busbar 42.

[0216] (Fourth variation)

[0217] Figure 22This is a cross-sectional view of the subunit SUT showing the fourth variation. In the above embodiment, the metal part 90 is fixed to the extension 63 of the busbar 42. Alternatively, the metal part 90 may also be fixed to at least one of the connecting part 61 and the connecting part 62 of the busbar 42. For example, the terminal 13 of the electronic component 10 and the connecting part 61 of the busbar 42 may be fastened together by the fastening member 117 that fixes the busbar 42 and the metal part 90, or the external connection busbar 76 may be fastened together with the connecting part 62 of the busbar 42. In addition, the metal part 90 provided corresponding to the connecting part 61 or the connecting part 62 of the busbar 42 may also have any of the forms in the first to third variations described above.

[0218] <7. Connection Structure of Sub-units>

[0219] Next, the connection structure between multiple sub-units SU will be explained.

[0220] Figure 23 This is a perspective view showing the connection structure between subunit SUS and subunit SUT. In this embodiment, a step ST is formed between subunit SUS and subunit SUT based on the height difference in the Z direction between the base plate 41S of subunit SUS and the base component 41T of subunit SUT. Moreover, the step ST is used to achieve a three-dimensional intersection structure where the busbars 42 included in subunit SUS and the busbars 42 included in subunit SUT intersect.

[0221] For example, the busbars 42E, 42F, and 42I included in the subunit SUT maintain a height in the Z direction supported by the base member 41T and extend in the -Y direction to a position where they overlap with the base plate 41S of the subunit SUS in the Z direction. The connecting portions 61 of each of the busbars 42E, 42F, and 42I are away from the base plate 41S of the subunit SUS in the Z direction and face the base plate 41S of the subunit SUS in the Z direction.

[0222] On the other hand, the connecting portion 62 of the busbar 42A included in the subunit SUS protrudes in the +Z direction relative to the extension portion 63 of the busbar 42A, and contacts the connecting portion 61 of the busbar 42E from the -Z direction side. The connecting portion 62 of the busbar 42A and the connecting portion 61 of the busbar 42E are fixed by the fastening member 43 and the engaging member 44.

[0223] Similarly, the connecting portion 62 of the busbar 42C included in the subunit SUS protrudes in the +Z direction relative to the extension portion 63 of the busbar 42C, and contacts the connecting portion 61 of the busbar 42I from the -Z direction side. The connecting portion 62 of the busbar 42C and the connecting portion 61 of the busbar 42I are fixed by the fastening member 43 and the engaging member 44.

[0224] The extension 63 of busbar 42D included in subunit SUS extends in the X direction between the flat portion 111 of metal plate 110 and busbar 42I. For example, the extension 63 of busbar 42D passes through the area overlapping with busbar 42I when viewed from the Z direction, extending across the +X and -X direction sides of busbar 42I. The connecting portion 62 of busbar 42D protrudes in the +Z direction relative to the extension 63 of busbar 42D, and contacts the connecting portion 61 of busbar 42F from the -Z direction side. The connecting portion 62 of busbar 42D and the connecting portion 61 of busbar 42F are fixed by fastening member 43 and engaging member 44.

[0225] <8. Extension Structure of Busbar>

[0226] Figure 24 It is along Figure 15 The diagram shows a cross-sectional view along line F24-F24 of the structure. In this embodiment, a busbar 42 (busbar 42K) is disposed between the base member 41T and the planar portion 111 of the metal plate 110, extending along the Y direction in the gap S2 between the base member 41T and the planar portion 111 of the metal plate 110. The busbar 42K extends, for example, across the -Y direction side and the +Y direction side of the base member 41T. The connecting portion 61 of the busbar 42K is physically and electrically connected to the busbar 42 included in the subunit SUS. The connecting portion 62 of the busbar 42K is physically and electrically connected to the busbar 76 for external connection. The busbar 42K is an example of a "third busbar".

[0227] <9. Metal Plates and Insulating Covers>

[0228] Next, return Figure 2 The metal plate 110 and the insulating cover 130 will be described.

[0229] <9.1 Metal Plate>

[0230] The metal plate 110 is a component that ensures the rigidity of the electrical connection unit 1 and improves its heat dissipation. The metal plate 110 is made of metal (e.g., aluminum or aluminum alloy). The metal plate 110 is an example of a "rigid component". The metal plate 110 may also be referred to as a "metal component" or a "heat dissipation component".

[0231] The metal plate 110 is rectangular along the X direction and the Y direction. The metal plate 110 has a first end 110e1, a second end 110e2, a third end 110e3, and a fourth end 110e4. The first end 110e1 and the second end 110e2 are a pair of ends in the long side direction of the metal plate 110 and are separated in the X direction. The third end 110e3 and the fourth end 110e4 are a pair of ends in the short side direction of the metal plate 110 and are separated in the Y direction. The metal plate 110 includes, for example, a planar portion 111, the plurality of fixing portions 112 (refer to Figure 9 ) as described above, and the plurality of fixing portions 113 (refer to Figure 9 ) as described above.

[0232] The planar portion 111 is a portion of the metal plate 110 formed in a plate shape. The planar portion 111 is in a plate shape along the horizontal direction. The planar portion 111 forms the main portion of the metal plate 110. The planar portion 111 forms the base portion (metal base portion) of the metal plate 110. The planar portion 111 has a size that covers the two sub-units SU from below.

[0233] In the present embodiment, the planar portion 111 has a first region A1 and a second region A2. The first region A1 is, for example, the region on the -Y direction side in the planar portion 111. When viewed from the Z direction, the above-mentioned sub-unit SUS faces the first region A1 of the planar portion 111. That is, the plurality of electronic components 10S and the base plate 41S included in the sub-unit SUS face the first region A1 of the planar portion 111 in the Z direction.

[0234] The second region A2 is, for example, the region on the +Y direction side in the planar portion 111. When viewed from the Z direction, the above-mentioned sub-unit SUT faces the second region A2 of the planar portion 111. That is, the plurality of electronic components 10T and the base member 41T included in the sub-unit SUT face the second region A2 of the planar portion 111 in the Z direction.

[0235] <9.2 Insulation Cover>

[0236] The insulation cover 130 is a component for preventing fingers from contacting the current-carrying path of the sub-unit SU. The insulation cover 130 is made of, for example, synthetic resin and has insulation properties. The insulation cover 130 is, for example, in a box shape with an open side on the -Z direction. The insulation cover 130 has a plurality of ventilation holes 130h. The insulation cover 130 covers a part or all of the corresponding sub-unit SU. In addition, the insulation cover 130 is not limited to a box-shaped component and may also be a sheet-shaped component that covers the current-carrying path of the main body portion MU. In addition, the insulation cover 130 may be omitted.

[0237] <10. Advantages>

[0238] <A. Advantages Related to the Division of Multiple Regions in the Electrical Connection Unit>

[0239] As a comparative example, consider a structure in which electronic components that require priority in heat dissipation and electronic components that require priority in mounting are mounted on a single base component. In such a structure, it is sometimes difficult to improve mounting performance when using a thin base component, and sometimes it is difficult to improve heat dissipation when using a thicker base component.

[0240] On the other hand, the electrical connection unit (e.g., electrical connection unit 1) of this embodiment includes a rigid component (e.g., metal plate 110), a first electronic component (e.g., electronic component 10S), a first base component (e.g., base plate 41S), a first busbar (e.g., busbars 42A, 42B, 42C, 42D), a second electronic component (e.g., electronic component 10T), a second base component (e.g., base component 41T), and a second busbar (e.g., busbars 42E, 42F, 42G, 42I). The rigid component includes a first region (e.g., first region A1) and a second region (e.g., second region A2). The first electronic component faces the first region in a first direction. The first base component faces the first region in the first direction, has a planar portion (e.g., planar portion 51), and is insulating. The first busbar is supported by the planar portion and electrically connected to the first electronic component. The second electronic component faces the second region in the first direction and generates less heat than the first electronic component. The second base component has a three-dimensional structure that faces the second region in the first direction and is thicker than the first base component in the first direction, and is insulating. The second busbar is supported by the second base component and is electrically connected to the second electronic component.

[0241] With this structure, by utilizing a first base component having a planar portion, a first electronic component prior to heat dissipation can be positioned near a rigid component, and the rigid component can be used as a heat dissipation component to promote heat release. On the other hand, by utilizing a second base component having a three-dimensional structure that is thicker in the first direction, a second electronic component prior to installation can be appropriately mounted. By using such a differentiated area, an electrical connection unit that achieves both heat dissipation and installation feasibility can be provided.

[0242] In this embodiment, the first electronic component faces the planar portion. The second base component has a receiving portion (e.g., receiving portion 84A) that is recessed in the first direction or extends through the second base component in the first direction. At least a portion of the second electronic component is received in the receiving portion. With this structure, the first electronic component, which is important for heat dissipation, can be exposed to the outside of the first base component to improve heat dissipation, and the second electronic component can be disposed in the receiving portion of the second base component. With this structure, even when using a relatively thick second base component, the overall thinness of the electrical connection unit can be achieved.

[0243] In this embodiment, the electrical connection unit further includes a heat-conducting component (e.g., heat-conducting component 120). The first busbar includes an exposed portion (e.g., exposed portion 42u) exposed in the gap between the planar portion and the rigid component. The heat-conducting component is disposed between the exposed portion of the first busbar and the rigid component. With this structure, a more secure thermal connection can be made between the first electronic component, which requires heat dissipation, and the rigid component. Through such a thermal connection, heat dissipation can be further improved.

[0244] In this embodiment, the first electronic component has a terminal (e.g., terminal 13) oriented in a second direction different from the first direction. The second electronic component has a terminal (e.g., terminal 13) protruding toward the rigid component in the first direction. Here, the second electronic component with a terminal protruding toward the rigid component in the first direction is prone to having a complex mounting structure. However, by utilizing a second base component that is thicker in the first direction, even this second electronic component, which is prone to having a complex mounting structure, can be easily and appropriately mounted. This mounting structure improves mountability.

[0245] In this embodiment, the electrical connection unit further includes a third base component (e.g., auxiliary base component 101). This third base component is disposed between the second base component and the rigid component in the first direction and is provided with wiring (e.g., wiring 102) that is electrically connected to the terminals of the second electronic component. With this structure, by distributing the third base component between the second base component and the rigid component, even a second electronic component whose mounting structure is prone to becoming complex can be easily and appropriately mounted. This mounting structure improves installability.

[0246] In this embodiment, the second busbar protrudes from the second base component to a position overlapping the first base component in the first direction. The first busbar extends through the space between the rigid component and the second busbar. With this structure, a three-dimensional intersection structure of the first and second busbars can be achieved by utilizing the thickness difference between the first and second base components. This intersection structure improves the freedom of wiring and / or component configuration within the electrical connection unit.

[0247] In this embodiment, the above-described electrical connection unit further includes a third bus bar (e.g., bus bar 42K). The above-described third bus bar is disposed between the above-described second base member and the above-described rigid member in the above-described first direction and is electrically connected to the above-described first bus bar. With such a structure, it is possible to dispose the third bus bar using the gap between the above-described second base member and the above-described rigid member. By this disposition of the bus bar, it is possible to increase the degree of freedom in wiring layout and / or the degree of freedom in component disposition within the electrical connection unit.

[0248] <B. Advantages related to the metal part>

[0249] As a comparative example, consider a structure in which the metal part 90 is not provided. In such a structure, for example, when the bus bar 42 does not have a sufficiently large heat capacity, when heat is transferred from the bus bar 76 to the bus bar 42, the thermal interference to the electronic component 10 may become large. Therefore, it is sometimes difficult to achieve improvement in thermal characteristics.

[0250] On the other hand, the electrical connection unit (e.g., electrical connection unit 1) of this embodiment has a first electronic component (e.g., electronic component 10), a bus bar (e.g., bus bar 42), and a metal part (e.g., metal part 90). The above-described bus bar includes a plate portion (e.g., horizontal plate portion 42p) and is electrically connected to the above-described first electronic component. The above-described metal part faces the above-described bus bar in the thickness direction of the above-described plate portion, i.e., the first direction, and is thermally connected to the above-described bus bar. The thickness (e.g., thickness H31) of the above-described metal part in the above-described first direction is 2 times or more the thickness (e.g., thickness T1) of the above-described plate portion. With such a structure, at least a part of the heat transferred to the above-described bus bar is stored (absorbed) by the above-described metal part. Through this heat storage effect, it is possible to achieve improvement in the thermal characteristics of the electrical connection unit.

[0251] In this embodiment, the above-described bus bar includes a first connection portion (e.g., connection portion 61), a second connection portion (e.g., connection portion 62), and an extension portion (e.g., extension portion 63). The above-described first connection portion is electrically connected to the above-described first electronic component (e.g., electronic component 10). The above-described second connection portion is electrically connected to a second electronic component (e.g., electronic component 10) or an external connection component (e.g., bus bar 76). The above-described extension portion extends between the above-described first connection portion and the above-described second connection portion. At least a part of the above-described metal part faces the above-described extension portion of the above-described bus bar. With such a structure, it is possible to dispose the above-described metal part without interfering with the fastening structure provided in the above-described first connection portion or the above-described second connection portion. Through this structure, the degree of freedom in the shape or size of the above-described metal part becomes high, and it is possible to further improve the thermal characteristics of the electrical connection unit.

[0252] In this embodiment, when the extension direction of the busbar is designated as the second direction, and the direction intersecting the first and second directions is designated as the third direction, the width of the third direction of the metal portion is larger than the width of the third direction of the first electronic component. With this structure, by configuring the metal portion with a width larger than that of the busbar, the heat capacity can be significantly increased. This increase in heat capacity further improves the thermal characteristics of the electrical connection unit.

[0253] In this embodiment, the electrical connection unit, in addition to the first electronic component, the busbar, and the metal portion described above, also includes a rigid component (e.g., a metal plate 110). The rigid component includes an opposing portion (e.g., a flat portion 111) facing the busbar in a first direction. The metal portion is either part of the metal component or separate from it. The metal portion is disposed between the busbar and the opposing portion in the first direction. With this structure, the metal portion allows at least a portion of the heat from the busbar to move toward the rigid component, enabling the rigid component to function as a heat dissipation component and release heat. Through this heat dissipation effect, the thermal characteristics of the electrical connection unit can be further improved.

[0254] In this embodiment, the electrical connection unit also includes a heat-conducting component. This heat-conducting component is disposed between the busbar and the metal portion, or between the metal portion and the opposing portion. This structure allows for a more robust thermal connection between the busbar and the rigid component. This thermal connection further improves the thermal characteristics of the electrical connection unit.

[0255] In this embodiment, the electrical connection unit further includes a base component (e.g., base component 41T). The base component is disposed between the busbar and the opposing portion in the first direction. The base component supports the busbar and is insulating. The base component has a receiving portion (e.g., receiving portion 84B) that opens in the first direction. At least a portion of the metal portion is disposed in the receiving portion. With this structure, even with the metal portion, the electrical connection unit can be kept from becoming large. This structure facilitates miniaturization (e.g., thinning) of the electrical connection unit.

[0256] In this embodiment, the aforementioned metal part is a metal block separately disposed from the aforementioned rigid component. With this structure, the heat capacity can be easily increased through the aforementioned metal part. This increase in heat capacity allows for further improvement in the thermal characteristics of the electrical connection unit.

[0257] In this embodiment, the metal part is provided as a part of the rigid member and is a protruding part that protrudes from the opposing part in the first direction. With such a structure, the metal part can be provided using a part of the rigid member. Through this structure, cost reduction of the electrical connection unit can be achieved.

[0258] <C. Advantages Related to the First Shape Example of the Bus Bar>

[0259] As a comparative example, consider a bus bar in which the width of the connection part 61 is the same as the width of the extension part 63. In such a structure, compared with the extension part 63, the temperature locally rises at the connection part 61 connected to the electronic component 10, and it is sometimes difficult to improve the thermal characteristics of the electrical connection unit.

[0260] On the other hand, the bus bar (for example, the bus bar 42) of this embodiment has a first connection part (for example, the connection part 61) and a first extension part (for example, the first straight part 63a of the extension part 63). The first connection part is directly connected to the first terminal (for example, the terminal 13A) of the electronic component (for example, the electronic component 10) or via a first connection member (for example, the connection member 20A). The first extension part extends from the first connection part. When the thickness direction of the first extension part is set as the first direction, the extension direction of the first extension part is set as the second direction, and the direction crossing the first direction and the second direction is set as the third direction, the width (for example, the width W11) of the first connection part in the third direction is larger than the width (for example, W12) of the first extension part in the third direction.

[0261] With such a structure, the width of the first connection part connected to the electronic component is enlarged, and the thermal characteristics (for example, heat storage property and / or heat dissipation property) of the first connection part are improved. Through this structure, compared with the first extension part, local temperature rise at the first connection part can be suppressed, and improvement of the thermal characteristics of the electrical connection unit can be achieved.

[0262] In this embodiment, the first connecting portion has a first edge (e.g., edge 61e1) extending along the second direction and a second edge (e.g., edge 61e2) located on the side opposite to the first edge in the third direction and extending along the second direction. The first extension has a third edge (e.g., edge 63e1) extending along the second direction and a fourth edge (e.g., edge 61e2) located on the side opposite to the third edge in the third direction and extending along the second direction. The first edge and the third edge are continuous in a straight line in the first direction. There is a step in the third direction between the second edge and the fourth edge. With this structure, the width of the first connecting portion is increased compared to the first extension, and other components (e.g., electronic component 10 or busbar 42) can be easily arranged along the continuous first and third edges. With this structure, miniaturization of the electrical connection unit can be achieved.

[0263] In this embodiment, the electrical connection unit, in addition to the aforementioned busbar, also includes a base component (e.g., base plate 41S). The base component includes a planar portion (e.g., planar portion 51) and is insulating. The base component has a receiving portion (e.g., receiving portion 55) that is recessed in the first direction or extends through the base component in the first direction. At least a portion of the first connecting portion and at least a portion of the first extension are received within the receiving portion. Inside the receiving portion, the width of the first connecting portion in the third direction is greater than the width of the first extension in the third direction. With this structure, since at least a portion of the first connecting portion and at least a portion of the first extension are received within the receiving portion of the base component, even if the width of the first connecting portion is increased compared to the first extension, a dead zone is less likely to be generated within the electrical connection unit. This structure provides an electrical connection unit that is more conducive to miniaturization.

[0264] In this embodiment, the electrical connection unit further includes a first connecting member (e.g., connecting member 20A). The width of the third direction of the first extension is the same as or smaller than the width of the third direction of the first connecting member (e.g., width W13). On the other hand, the width of the first connecting portion in the third direction is greater than the width of the first connecting member in the third direction. With this structure, the first connecting portion is enlarged beyond the originally required width. This structure enables a further improvement in the thermal characteristics of the electrical connection unit.

[0265] The above-mentioned electrical connection unit further includes a second bus bar (such as bus bar 42B). The second bus bar includes a second connection portion (such as connection portion 61) and a second extension portion (such as the first straight portion 63a of extension portion 63). The second connection portion is adjacent to the first connection portion in the third direction and is directly or indirectly connected to the second terminal (such as terminal 13B) of the electronic component via a second connection component (such as connection component 20B). The second extension portion is adjacent to the first extension portion in the third direction and extends from the second connection portion in the second direction. The first connection portion protrudes from the first extension portion to the side opposite to the second bus bar. The second connection portion protrudes from the second extension portion to the side opposite to the first bus bar. According to such a structure, even when the first connection portion of the first bus bar and the second connection portion of the second bus bar are respectively enlarged in the third direction, the first bus bar and the second bus bar can be arranged close to each other. Through this structure, further miniaturization of the electrical connection unit can be achieved.

[0266] <D. Advantages related to the second shape example of the bus bar>

[0267] As a comparative example, consider a bus bar in which the extension portion 63 extends from the connection portion 61 to the connection portion 62 at the shortest distance. In such a structure, heat is easily transferred from the connection portion 61 to the connection portion 62, and it is sometimes difficult to improve the thermal characteristics of the electrical connection unit.

[0268] On the other hand, the bus bar (such as bus bar 42) of the present embodiment includes a first connection portion (such as connection portion 61), a second connection portion (such as connection portion 62), a first extension portion (such as the first straight portion 63a of extension portion 63), and a second extension portion (such as the second straight portion 63b of extension portion 63). The first connection portion is directly or indirectly connected to the first electronic component (such as electronic component 10A) via a connection component (such as connection component 20B). The second connection portion is directly or indirectly connected to the second electronic component (such as electronic component 10B) via a connection component (such as connection component 20C). The first extension portion extends from the first connection portion in a direction different from the direction from the first connection portion to the second connection portion. The first extension portion includes a first part and a second part. The first part is connected to the first extension portion. The second part is located on the side opposite to the first part with respect to the second connection portion in the extension direction of the first extension portion. The second extension portion extends from the second part of the first extension portion in a direction approaching the second connection portion.

[0269] With this structure, the first extension does not extend from the first connection to the second connection with the shortest distance, but is deliberately extended in a circuitous manner. If the busbar has an extension that extends in a circuitous manner, the thermal characteristics (e.g., heat storage and / or heat dissipation) of the circuitous extension portion in the busbar can be improved. With this structure, the thermal characteristics of the electrical connection unit can be improved.

[0270] In this embodiment, the busbar also has a third extension (e.g., a third straight section 63c). The second extension extends in a direction from the second portion of the first extension toward the second connecting portion, and in a direction different from the direction from the second portion of the first extension toward the second connecting portion with the shortest distance. With this structure, the second extension does not extend from the first extension toward the second connecting portion with the shortest distance, but is intentionally extended in a circuitous manner. This structure further improves the thermal characteristics of the busbar (e.g., heat storage and / or heat dissipation), and further enhances the thermal characteristics of the electrical connection unit.

[0271] In this embodiment, the first extension and the second extension are located on the same plane. When the thickness direction of the first and second extensions is designated as a first direction, the extension direction of the first extension as a second direction, and the extension direction of the second extension as a third direction, the width of the second extension (e.g., width W23) in the direction intersecting the first and third directions is larger than the width of the first extension (e.g., width W22) in the direction intersecting the first and second directions. With this structure, the width of the second extension is increased, and its thermal characteristics (e.g., heat storage and / or heat dissipation) are improved. This structure can suppress localized temperature rise at the first or second connection portion, thereby improving the thermal characteristics of the electrical connection unit.

[0272] In this embodiment, the electrical connection unit further includes an insulating base component (e.g., a base plate 41S) including a planar portion (e.g., planar portion 51). The base component has a receiving portion (e.g., a receiving portion 55) that is recessed in a first direction, which is the thickness direction of the plate portion, or extends through the base component in the first direction. At least a portion of the first extension and at least a portion of the second extension are received in the receiving portion. Inside the receiving portion, the width of the second extension is greater than the width of the first extension. With this structure, since at least a portion of the first extension and at least a portion of the second extension are received in the receiving portion of the base component, even if the width of the second extension is increased compared to the first extension, dead zones are less likely to occur within the electrical connection unit. This structure provides an electrical connection unit that is more conducive to miniaturization.

[0273] In this embodiment, when the thickness direction of the aforementioned plate portion is set as the first direction, at least a portion of the first extension overlaps with the first electronic component in the aforementioned direction, while the second extension does not overlap with either the first or second electronic component in the aforementioned first direction. With this structure, the width of the second extension is increased in the region where it does not overlap with the electronic component (the region where the electronic component is less likely to obstruct heat dissipation). This structure allows for better heat dissipation from the widened second extension, further improving the thermal characteristics of the electrical connection unit.

[0274] <11. Variations>

[0275] Next, several variations will be described. Furthermore, in each variation, the structures other than those described below are the same as those in the embodiments described above.

[0276] (First variation)

[0277] The wiring substrate 40S is not limited to a structure in which the base plate 41S and the busbar 42 are integrally formed by insert molding. For example, the busbar 42 may be disposed in the receiving portion 55 after the base plate 41S, which is provided with a receiving portion 55 for receiving the busbar 42, has been formed. In this case, the busbar 42 may be fixed to the receiving portion 55 by fitting, or by adhesive or other fixing means. In these cases, potting may also be performed to fill the gap between the busbar 42 and the receiving portion 55.

[0278] (Second variation)

[0279] The base component of the wiring substrate 40S is not limited to the base plate 41S having a plate-shaped planar portion 51. The wiring substrate 40S may also be a base component having a sheet-shaped planar portion 51 (e.g., an insulating sheet). In this case, a portion of the planar portion 51 may be formed to follow the shape of the busbar 42 to form a receiving portion 55. It should be noted that in this disclosure, "sheet-shaped" or "sheet" is not limited to a component with a thickness of 1 mm or more, and may also be a component with a thickness of less than 1 mm (a so-called film).

[0280] (Third variation)

[0281] The substrate 41S of the wiring substrate 40S may include multiple components (plate components or sheet components). These multiple components are arranged to hold multiple busbars 42 arranged in a horizontal direction. For example, the multiple components may be integrally formed by holding the multiple busbars 42 together through lamination. The multiple components form a planar portion 51. In this case, the receiving portion 55 may also be formed hollow inside the substrate 41S (between the multiple components). The multiple components may be multiple plate components, multiple sheet components, or a combination of plate components and sheet components. The sheet components may, for example, be flexible sheet components. The planar portion 51 formed by the multiple components has an opening that exposes at least the first connecting portion 61 and the second connecting portion 62 of the busbars 42.

[0282] (Fourth variation)

[0283] The connection between the electronic component 10 and the busbar 42 is not limited to the connection via the connecting member 20. The electronic component 10 may also be directly connected to the busbar 42 using fastening members (e.g., bolts, screws) or welding.

[0284] The above describes several embodiments and modifications. However, the embodiments and modifications are not limited to the examples described above. For example, the various modifications described above can also be combined with each other to achieve the desired effect.

[0285] Explanation of reference numerals in the attached figures

[0286] 1…Electrical connection unit

[0287] SU, SUS, SUT… sub-units

[0288] 10, 10S, 10T, 10TA, 10TB… Electronic components

[0289] 13, 13A, 13B…terminals

[0290] 20…Connecting parts

[0291] 40S… Wiring substrate

[0292] 40T… Wiring Structure

[0293] 41S…Matrix plate

[0294] 41T…Base Components

[0295] 42…Busbar

[0296] 51… Planar section

[0297] 52… Frame

[0298] 55…Containment Department

[0299] 61…Connecting part

[0300] 62…Connecting part

[0301] 63… Extension

[0302] 63a…First straight section

[0303] 63aa…First end (first part)

[0304] 63ab…Second end (second part)

[0305] 63b…Second straight section

[0306] 63c…Third straight section

[0307] 84A, 84B... Containment Department

[0308] 85…frame

[0309] 90…Metal Department

[0310] 101…Auxiliary base components

[0311] 102… wiring

[0312] 110… Metal plate (rigid components, metal components, heat dissipation components)

[0313] 111…Flat section (opposite section)

[0314] 120… Thermal conductive components

Claims

1. A busbar, characterized in that, have: A first connecting portion, the first connecting portion being directly or via a first connecting member connected to a first terminal of an electronic component; and A first extension portion extends from the first connecting portion. When the thickness direction of the first extension is set as the first direction, the extension direction of the first extension is set as the second direction, and the direction intersecting the first direction and the second direction is set as the third direction, the width of the third direction of the first connecting portion is greater than the width of the third direction of the first extension.

2. The busbar according to claim 1, characterized in that, The first connecting portion has a first edge extending along the second direction and a second edge located on the side opposite to the first edge in the third direction and extending along the second direction. The first extension has a third edge extending along the second direction and a fourth edge located on the side opposite to the third edge in the third direction and extending along the second direction. The first edge and the third edge are continuous in a straight line in the second direction. There is a third-direction step between the second edge and the fourth edge.

3. An electrical connection unit, characterized in that, have: The busbar as described in claim 1 or 2; and The electronic component.

4. The electrical connection unit according to claim 3, characterized in that, The electrical connection unit also includes an insulating base component with a planar portion. The base component has a receiving portion that is recessed in the first direction or extends through the base component in the first direction. At least a portion of the first connecting portion and at least a portion of the first extension portion are received within the receiving portion. Inside the receiving portion, the third-direction width of the first connecting portion is greater than the third-direction width of the first extension portion.

5. The electrical connection unit according to claim 3, characterized in that, The electrical connection unit also includes the first connection component. The third-direction width of the first extension is the same as or less than the third-direction width of the first connecting member. The third-direction width of the first connecting portion is greater than the third-direction width of the first connecting component.

6. The electrical connection unit according to claim 3, characterized in that, In the case where the busbar is the first busbar, a second busbar is also provided. The second busbar includes: a second connecting portion adjacent to the first connecting portion in the third direction and connected directly or via the second connecting portion to a second terminal of the electronic component; and a second extension portion adjacent to the first extension portion in the third direction and extending from the second connecting portion along the second direction. The first connecting portion protrudes to the side opposite to the second busbar relative to the first extension portion. The second connecting portion protrudes to the side opposite to the first busbar relative to the second extension portion.

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