Electrical connection unit

Abstract

The electrical connection unit has a rigid member, a first electronic component, a first base member, a first bus bar, a second electronic component, a second base member, and a second bus bar. The rigid member includes a first region and a second region. The first electronic component faces the first region in a first direction. The first base member faces the first region in the first direction, includes a planar portion, and is insulating. The second electronic component faces the second region in the first direction, and a calorific value is smaller than that of the first electronic component. The second base member has a three-dimensional structure facing the second region in the first direction and thicker than the first base member in the first direction, and is insulating.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to 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 electrical connection unit is desired to achieve a balance between heat dissipation and mountability.

[0008] One embodiment provides an electrical connection unit capable of achieving a balance between heat dissipation and mountability.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] One embodiment of an electrical connection unit has a rigid member, a first electronic component, a first base member, a first bus bar, a second electronic component, a second base member, and a second bus bar. The rigid member includes a first region and a second region. The first electronic component faces the first region in a first direction. The first base member faces the first region in the first direction and includes a flat portion that is insulative. The first bus bar is supported by the flat portion and electrically connected to the first electronic component. The second electronic component faces the second region in the first direction and has a smaller heat generation amount than the first electronic component. The second base member has a three-dimensional structure that faces the second region in the first direction and is thicker than the first base member in the first direction, and is insulative. The second bus bar is supported by the second base member and electrically connected to the second electronic component.

[0011] EFFECT OF THE INVENTION

[0012] According to one embodiment, a balance between heat dissipation and mountability can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a cross-sectional view showing an electrical connection unit of an embodiment.

[0014] Figure 2 is a perspective view for explaining a main body portion of an embodiment.

[0015] Figure 3is a perspective view of one subunit of the embodiment for explanation.

[0016] Figure 4 is a perspective view of an electronic component and a connecting component of the embodiment.

[0017] Figure 5 is a perspective view of a wiring substrate of the embodiment for explanation.

[0018] Figure 6 is a perspective view of a part of the wiring substrate of the embodiment, which is exploded.

[0019] Figure 7 is a plan view of a subunit of the embodiment.

[0020] Figure 8 is a sectional view along the F8-F8 line of the structure shown in Figure 7

[0021] Figure 9 is a sectional view along the F9-F9 line of the structure shown in Figure 7

[0022] Figure 10 is a plan view of a first shape example of a bus bar of the embodiment for explanation.

[0023] Figure 11 is a plan view of a second shape example of a bus bar of the embodiment for explanation.

[0024] Figure 12 is a perspective view of another subunit of the embodiment.

[0025] Figure 13 is a front view of an electronic component of the embodiment.

[0026] Figure 14 is a perspective view of a base component of the embodiment.

[0027] Figure 15 is a plan view of a subunit of the embodiment.

[0028] Figure 16 is a sectional view along the F16-F16 line of the structure shown in Figure 15

[0029] is a sectional view along the F17-F17 line of the structure shown in Figure 17 Figure 15 is a sectional view along the F18-F18 line of the structure shown in

[0030] Figure 18 Figure 15

[0031] ​​​​​Figure 19 is a cross-sectional view showing a subunit of a first modification example of the embodiment.

[0032] Figure 20 is a cross-sectional view showing a subunit of a second modification example of the embodiment.

[0033] Figure 21 is a cross-sectional view showing a subunit of a third modification example of the embodiment.

[0034] Figure 22 is a cross-sectional view showing a subunit of a fourth modification example of the embodiment.

[0035] Figure 23 is a perspective view showing a connection structure between a plurality of subunits of the embodiment.

[0036] Figure 24 is a cross-sectional view along F24-F24 line of the structure shown in Figure 15 DETAILED DESCRIPTION

[0037] Hereinafter, the embodiment will be described with reference to the drawings. In the following description, the same reference numerals are assigned to structures having the same or similar functions. Also, sometimes repeated description of these structures is omitted. In addition, the structures described below do not limit the scope of the embodiment.

[0038] In the present disclosure, the terms are defined as follows. The "connection" is not limited to a mechanical connection, and can include an electrical connection. That is, the "connection" is not limited to a case where two elements as connection objects are directly connected, and can include a case where two elements as connection objects are connected with other elements interposed therebetween. The "accommodation" is not limited to a case where the entirety of a component is accommodated, and can include a case where only a part of a component is accommodated (a state where another part of the component protrudes). The "facing" means that imaginary projected images of two objects overlap each other in a case where they are observed from a particular direction. That is, the "facing" is not limited to a case where two objects directly face each other, and can include a case where two objects face each other in a state where other components are present between the two objects. The "parallel", "orthogonal", or "identical" can respectively include a case where "approximately parallel", "approximately orthogonal", or "approximately identical" is satisfied.

[0039] In the present disclosure, the +X direction, the -X direction, the +Y direction, the -Y direction, the +Z direction, and the -Z direction are defined as follows. The +X direction is a direction from a first end portion 110e1 of a metal plate 110 described later toward a second end portion 110e2 (refer to FIG. 1). The -X direction is a direction opposite to the +X direction. The +Y direction is a direction perpendicular to the +X direction and the -X direction. The -Y direction is a direction opposite to the +Y direction. The +Z direction is a direction perpendicular to the +X direction and the +Y direction. The -Z direction is a direction opposite to the +Z direction. Figure 2 ​) The -X direction is a direction opposite to the +X direction. Hereinafter, the +X direction and the -X direction are not distinguished, and are simply referred to as the "X direction". The +Y direction and the -Y direction are directions intersecting (for example, orthogonal to) the X direction. The +Y direction is a direction from the third end portion 110e3 of the metal plate 110 described later toward the fourth end portion 110e4 (refer to FIG. 1). The -Y direction is a direction opposite to the +Y direction. Hereinafter, the +Y direction and the -Y direction are not distinguished, and are simply referred to as the "Y direction". The +Z direction and the -Z direction are directions intersecting (for example, orthogonal to) the X direction and the Y direction. The +Z direction is a direction from the metal plate 110 described later toward the main body portion MU (refer to FIG. 1). The -Z direction is a direction opposite to the +Z direction. Hereinafter, the +Z direction and the -Z direction are not distinguished, and are 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". Figure 2 ) The -Y direction is a direction opposite to the +Y direction. Hereinafter, the +Y direction and the -Y direction are not distinguished, and are simply referred to as the "Y direction". The +Z direction and the -Z direction are directions intersecting (for example, orthogonal to) the X direction and the Y direction. The +Z direction is a direction from the metal plate 110 described later toward the main body portion MU (refer to Figure 2 ) The -Z direction is a direction opposite to the +Z direction. Hereinafter, the +Z direction and the -Z direction are not distinguished, and are 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".

[0040] Hereinafter, the X direction and the Y direction are not distinguished, and are sometimes referred to as the "horizontal direction". Hereinafter, the Z direction is sometimes referred to as the "vertical direction". In addition, hereinafter, the +Z direction side is sometimes referred to as "up", and the -Z direction side is sometimes referred to as "down". However, these expressions are expressions for convenience of explanation, and do not limit the direction of gravity of the electrical connection unit 1 (the setting posture of the electrical connection unit 1).

[0041] (Embodiment)

[0042] <1. Structure of Electrical Connection Unit>

[0043] Figure 1 is a cross-sectional view showing the electrical connection unit 1 of the embodiment. The electrical connection unit 1 is, for example, an on-vehicle device mounted on a vehicle such as an EV (Electric Vehicle), an HEV (Hybrid Electric Vehicle), or a PHEV (Plug-in Hybrid Electric Vehicle). The electrical connection unit 1 can also be referred to as an "electrical connection box" or a "junction box", for example. However, the electrical connection unit 1 is not limited to a box-type device.

[0044] The electrical connection unit 1 has, for example, a frame 5, a main body portion MU, a metal plate 110, a plurality of heat-conductive members 120 (refer to Figure 2 ), and a plurality of insulating covers 130 (refer to Figure 2 ).

[0045] <2. Frame>

[0046] First, the frame 5 will be described. The frame 5 forms the outer shape of the electrical connection unit 1. The frame 5 includes, for example, a base 6 (first member) and a cover 7 (second member). The base 6 is a member that covers the main body portion MU and the metal plate 110 from below. The base 6 is, for example, a plate shape in the horizontal direction or a bowl shape that is open in the +Z direction. The base 6 is, for example, made of synthetic resin. The cover 7 is a member that covers the main body portion MU and the metal plate 110 from above. The cover 7 is, for example, a bowl shape that is open in the -Z direction. The cover 7 is, for example, made of synthetic resin. In the present embodiment, the frame 5 is formed in a box shape 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 can also function as part or all of the base 6. In addition, the frame 5 can be omitted.

[0047] In the present 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 a region that places importance on heat dissipation. In the first region R1, for example, the electronic component 10S that generates a large amount of heat is disposed. On the other hand, the second region R2 is a region that places importance on mountability. In the second region R2, for example, the electronic component 10T that generates a smaller amount of heat than the electronic component 10S and / or requires a more complex mounting structure than the electronic component 10S is disposed. However, these contents do not limit the contents of the electrical connection unit 1 of the present disclosure. For example, the electronic component 10T can also generate a larger amount of heat than the electronic component 10S.

[0048] <3. Main Body Portion>

[0049] Next, the main body portion MU will be described.

[0050] Figure 2 is a perspective view for illustrating the main body portion MU. The main body portion MU is a portion that assumes a main function of the electrical connection unit 1 (for example, switching of the electrical connection state or overcurrent protection). In the present embodiment, the main body portion MU is divided into a plurality of sub-units SU. The main body portion MU is formed, for example, by connecting a plurality of sub-units SU. In the present embodiment, the main body portion MU has two sub-units SU (sub-units SUS, SUT). Each sub-unit SU can also be referred to as a "circuit structure".

[0051] The sub-unit SUS has a first function in terms of electricity. The sub-unit SUS includes, for example, a plurality of electronic components 10S and a wiring substrate 40S. The plurality of electronic components 10S are electrically connected to the wiring substrate 40S. The base plate 41S (described later) included in the sub-unit SUS is an example of a "first base member".

[0052] The sub-unit SUT has an electrical second function. The second function is, for example, a function different from the first function. The sub-unit SUT includes, for example, a plurality of electronic components 10T and a wiring structure 40T. The plurality of electronic components 10T are electrically connected to the wiring structure 40T. A base member 41T (described later) included in the sub-unit SUT is an example of a "second base member".

[0053] In the present embodiment, the sub-unit SUS is a sub-unit SU that places importance on 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 described later in the Z direction.

[0054] On the other hand, the sub-unit SUT is a sub-unit SU that places importance on mountability. The sub-unit SUT is disposed, for example, on the +Y direction side with respect to the sub-unit SUS. The sub-unit SUT is disposed in the second region R2 of the electrical connection unit 1 described above. The sub-unit SUT faces the second region A2 of the metal plate 110 described later in the Z direction. Hereinafter, the electronic components 10S and the electronic components 10T are not distinguished and are simply referred to as "electronic components 10".

[0055] Further, instead of the example described above, the main body MU can not be divided into a plurality of sub-units SU. For example, the plurality of sub-units SU can be integrally formed. For example, the base plate 41S of the wiring substrate 40S and the base member 41T of the wiring structure 40T described later can be integrally formed from one piece of member.

[0056] <4. Configuration of sub-unit SUS>

[0057] Next, the structure of the sub-unit SUS will be described.

[0058] Figure 3 is a perspective view for illustrating the sub-unit SUS. The sub-unit SUS includes, for example, a plurality of electronic components 10, a plurality of connection members 20, and a wiring substrate 40S. The connection member 20 is a member that forms a vertical power supply path. The connection member 20 can also be referred to as a "vertical wiring member".

[0059] <4.1 Electronic component>

[0060] First, the electronic component 10 will be described. The electronic component 10 is an electronic component mounted in accordance with a function required for each sub-unit SU. The electronic component 10 is, for example, also a connector, a fuse, a relay (for example, a mechanical relay or a semiconductor relay), a capacitor, a branch member, various sensors (for example, a current sensor or a voltage sensor), an electronic control unit, or an electronic component unit in which two or more of these are unified. However, the type of the electronic component 10 is not limited to the example described above. The electronic component 10 is, for example, a heating component that generates heat when power is supplied.

[0061] In the present embodiment, the plurality of electronic components 10 includes an electronic component 10S that generates a large amount of heat when energized. The electronic component 10S is a relay (for example, a mechanical relay or a semiconductor relay), a fuse, or a current sensor (for example, a current sensor having a shunt resistor), or the like. However, the type of the electronic component 10S is not limited to the above examples.

[0062] Figure 4 is a perspective view showing the electronic component 10S and the connection component 20. The electronic component 10S is, for example, an electronic component in which a plurality of terminals 13 are arranged at one end portion of the electronic component 10S. The electronic component 10S has, for example, a housing 11, a component main body portion 12, a plurality of terminals 13, and a plurality of mounting portions 14.

[0063] (Housing)

[0064] The housing 11 is an outer member that forms a large portion of the outer shape of the electronic component 10S. The housing 11 is, for example, made of synthetic resin and has insulating properties. The housing 11 accommodates the component main body portion 12. Further, the housing 11 and the component main body portion 12 can be integrally formed.

[0065] In the present embodiment, the housing 11 has an insulating rib 11a that protrudes in the horizontal direction (for example, the Y direction) and extends in the Z direction. The insulating rib 11a is, for example, plate-shaped in the horizontal direction (for example, the Y direction) and the Z direction. The insulating rib 11a extends, for example, over the entire length of the housing 11 in the Z direction. The insulating rib 11a is arranged between the plurality of terminals 13 (terminals 13A and 13B described later). The insulating rib 11a electrically insulates the terminal 13A from the terminal 13B. In the present embodiment, a portion of the insulating rib 11a is arranged between the first portions 21 (described later) of the two connection components 20 connected to the electronic component 10S. The insulating rib 11a electrically insulates the first portions 21 of the two connection components 20 connected to the electronic component 10S from each other.

[0066] (Component main body portion)

[0067] The component main body portion 12 is a portion that assumes the main function of the electronic component 10S. For example, in the case where the electronic component 10S is a relay, the component main body portion 12 includes a switching portion (for example, a contact portion) that switches between an on state and an off state. For example, in the case where the electronic component 10S is a fuse, the component main body portion 12 includes a fuse portion that melts in the case where an overcurrent flows. For example, in the case where the electronic component 10S is a capacitor, the component main body portion 12 includes a portion that accumulates electric charge.

[0068] (Terminal)

[0069] The terminal 13 is an electric connection portion exposed to the outside of the housing 11. The terminal 13 is electrically connected to the component main body portion 12 inside the housing 11. In the present embodiment, the electronic component 10S includes a terminal 13A and a terminal 13B as the plurality of terminals 13. One of the terminal 13A and the terminal 13B is a terminal on the positive electrode side. The other of the terminal 13A and the terminal 13B is a terminal on the negative electrode side. One of the terminal 13A and the terminal 13B is an example of a "first terminal". The other of the terminal 13A and the terminal 13B is an example of a "second terminal".

[0070] In the present embodiment, the terminal 13A and the terminal 13B are provided at one end portion in the horizontal direction (for example, the Y direction) of the electronic component 10S. The terminal 13A and the terminal 13B are arranged side by side in the horizontal direction (for example, the X direction). The terminal 13A and the terminal 13B each face the horizontal direction (for example, the Y direction). Each of the terminals 13 has a mounting hole 13h in which a fastening member 71 (for example, a screw or a bolt) described later is installed. The mounting hole 13h is open in the horizontal direction (for example, the Y direction). An inner peripheral surface of the mounting hole 13h of the electronic component 10S has a screw groove.

[0071] (Mounting portion)

[0072] The mounting portion 14 is a portion for fixing the electronic component 10S. The mounting portion 14 has a mounting hole 14h in which a fastening member 116 (for example, a screw or a bolt, refer to Figure 9 ) described later is installed. 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 fixing object of the mounting portion 14 is described later.

[0073] <4.2 Connection member>

[0074] Next, the connection member 20 is described. The connection member 20 is a member that electrically connects the electronic component 10S and the wiring substrate 40S. The connection member 20 forms a part of the power supply path in the subunit SUS. The connection member 20 is made of metal (for example, copper, copper alloy, aluminum, or aluminum alloy). The connection member 20 can also be referred to as a "metal member".

[0075] In the present embodiment, the connection member 20 electrically connects the electronic component 10S and a bus bar 42 (refer to Figure 3 ) included in the wiring substrate 40S. In the present embodiment, the length L12 of the connection member 20 in the longitudinal direction (for example, the Y direction) of the electronic component 10S is shorter than the length L11 of the electronic component 10S in the longitudinal direction. The connection member 20 has, for example, a first portion 21 and a second portion 22.

[0076] (First portion)

[0077] The first portion 21 of the connection member 20 is a portion connected to the terminal 13 of the electronic component 10S. The first portion 21 is a plate-shaped or cuboid-shaped portion extending in the Z direction. The first portion 21 extends in the Z direction along one end portion (for example, an end portion in the Y direction) of the electronic component 10S. The first portion 21 is a standing portion standing in the Z direction with respect to the wiring substrate 40S (for example, with respect to the bus bar 42 described later). The first portion 21 is adjacent to the electronic component 10S in the horizontal direction (for example, the Y direction). For example, the first portion 21 is adjacent to the terminal 13 of the electronic component 10S in the horizontal direction (for example, the Y direction), and is connected to the terminal 13 of the electronic component 10S in the horizontal direction (for example, the Y direction).

[0078] The first portion 21 of the connection member 20 has a first mounting hole 21h through which the fastening member 71 (for example, a screw or a bolt) passes. The first mounting hole 21h is open in the horizontal direction (for example, the Y direction). The first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10S by the fastening member 71 passing through the first mounting hole 21h and engaging with the mounting hole 13h of the terminal 13 of the electronic component 10S.

[0079] (Second portion)

[0080] The second portion 22 of the connection member 20 is a portion connected to the bus bar 42 (refer to Figure 3 ). The second portion 22 protrudes from the end portion of the first portion 21 on the -Z direction side toward the horizontal direction (for example, the Y direction). The second portion 22 is a plate portion along the horizontal direction. The second portion 22 is adjacent to the bus bar 42 in the Z direction, and is connected to the bus bar 42 in the Z direction. The second portion 22 of the connection member 20 is mounted from the Z direction to the fastening member 43 (for example, a screw or a bolt, refer to Figure 8 ) protruding in the +Z direction from the bus bar 42, and is physically and electrically connected to the bus bar 42. In the present embodiment, the second portion 22 of the connection 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. Further, the second portion 22 is fixed to the bus bar 42 by the engaging member 44 (for example, a nut, refer to Figure 3 ) engaging with the end portion of the fastening member 43 passing through the second mounting hole 22h. In the present embodiment, the connection member 20 formed in an L shape by the first portion 21 and the second portion 22.

[0081] In the present embodiment, the bus bar 42 is disposed at a position (e.g., a position apart in the Z direction) apart from the terminal 13 of the electronic component 10S. The connection member 20 is disposed between the electronic component 10S and the bus bar 42. In the present disclosure, "the connection member is disposed between the electronic component and the bus bar" is not limited to a case where a part of the connection member is positioned between the electronic component and the bus bar when viewed in the X direction or the Y direction. "The connection member is disposed between the electronic component and the bus bar" can also correspond to a case where a part of the connection member is positioned between the electronic component and the bus bar when viewed in a direction inclined with respect to the X direction or the Y direction. The connection member 20 electrically connects the terminal 13 of the electronic component 10S and the bus bar 42.

[0082] <4.3 Wiring substrate>

[0083] Next, the wiring substrate 40S will be described.

[0084] Figure 5 is a perspective view for illustrating the wiring substrate 40S. The wiring substrate 40S is a member that forms at least a part of a power supply path between a plurality of electronic components 10 (e.g., a plurality of electronic components 10S) and / or at least a part of a power supply path between an electronic component 10 (e.g., an electronic component 10S) included in a subunit SUS and an electronic component 10 included in another subunit SU (e.g., a subunit SUT). In the present disclosure, "wiring substrate" refers to a wiring structure of a substrate type. "Substrate type" refers to a board shape when viewed as a whole regardless of a fine shape. Note that, in the present disclosure, "board shape", "sheet shape", or "plane" are not limited to a case where it is completely flat, and can include a case where a fixed structure, a rib, or the like that locally projects in the Z direction is present, a case where a concave-convex shape following the thickness of a bus bar is present on a surface, or the like. In the present embodiment, the wiring substrate 40S is a board shape along the X direction and the Y direction.

[0085] The wiring substrate 40S includes, for example, a base plate 41S, one or more (e.g., a plurality of) bus bars 42, and a plurality of fastening members 43. In the present embodiment, the base plate 41S and the plurality of bus bars 42 are integrated by insert molding. For example, after the fastening members 43 are fixed to the bus bars 42, the bus bars 42 are insert molded with the base plate 41S, and thus the wiring substrate 40S is formed as a one-piece member. That is, the bus bars 42 are integrated with the base plate 41S without using fastening members such as screws or bolts. Furthermore, the wiring substrate 40S can be formed by another structure instead of insert molding. Variations of the wiring substrate 40S formed by another structure will be described later.

[0086] 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.

[0087] <4.3.1 Base plate>

[0088] 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 ).

[0089] (Plane section)

[0090] 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.

[0091] 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.

[0092] The planar portion 51 has, for example, one or more (for example, a plurality of) accommodation portions 55 that accommodate the bus bars 42, respectively. The plurality of accommodation portions 55 are formed separately from each other in the X direction or the Y direction. Each accommodation portion 55 is, for example, a through-hole that penetrates the planar portion 51 in the Z direction. Note that the accommodation portion 55 can also be a recess provided to the first face 51a or the second face 51b of the planar portion 51 and recessed in the Z direction instead of a through-hole. Note that in the present disclosure, “the accommodation portion penetrates the planar portion in the first direction (Z direction)” can include a case where a part of the entire length of the accommodation portion 55 penetrates the planar portion 51 in the Z direction (for example, the remaining part of the accommodation portion 55 can be a recess recessed in the Z direction, or can be a form in which it is provided inside the base plate 41S without being exposed to the outside of the base plate 41S). Likewise, in the present disclosure, “the accommodation portion is recessed in the first direction (Z direction)” can include a case where a part of the entire length of the accommodation portion 55 is recessed in the Z direction (for example, the remaining part of the accommodation portion 55 can be a through-hole that penetrates the planar portion 51 in the Z direction, or can be a form in which it is provided inside the base plate 41S without being exposed to the outside of the base plate 41S).

[0093] Each accommodation portion 55 has an outer shape that corresponds to the shape of the bus bar 42 accommodated therein, when viewed from the Z direction. The plurality of accommodation portions 55 include, for example, four accommodation portions 55A, 55B, 55C, and 55D. The accommodation portion 55A is provided corresponding to the bus bar 42A described later, and accommodates at least a part of the bus bar 42A. The accommodation portion 55B is provided corresponding to the bus bar 42B described later, and accommodates at least a part of the bus bar 42B. The accommodation portion 55C is provided corresponding to the bus bar 42C described later, and accommodates at least a part of the bus bar 42C. The accommodation portion 55D is provided corresponding to the bus bar 42D described later, and accommodates at least a part of the bus bar 42D.

[0094] (Box portion)

[0095] The box portion 52 is provided to the peripheral end portion of the base plate 41S. The box portion 52 is a rib for reinforcement that protrudes upward and downward from the end portion of the planar portion 51 (see Figure 8 ). The width (thickness) H11 of the box portion 52 in the Z direction is, for example, less than half of the width (thickness) H12 of the electronic component 10 in the Z direction (see Figure 8 ). Note that the box portion 52 can also be omitted.

[0096] (Fixing portion)

[0097] The fixing portion 53 is a portion that is fixed to the metal plate 110 (see Figure 9 ). The fixing portion 53 has a mounting hole 53h that penetrates the base plate 41S in the Z direction. The fastening member 115 (for example, a screw or a bolt) described later passes through the mounting hole 53h. This will be described later.

[0098] <4.3.2 Bus Bars>

[0099] The bus bar 42 is a wiring member (an electrical connection member) included in the wiring substrate 40S. The bus bar 42 is, for example, a wiring member for electrically connecting a plurality of electronic components (for example, a plurality of electronic components 10S). Alternatively, the bus bar 42 can be a wiring member for electrically connecting the electronic component 10 (for example, the electronic component 10S) and an electronic component 10 included in another subunit SU (for example, the subunit SUS). The bus bar 42 is made of metal (for example, copper, a copper alloy, aluminum, or an aluminum alloy) and has electrical conductivity. In the present embodiment, a plurality of bus bars 42, for example, four bus bars 42A, 42B, 42C, and 42D are included. The four bus bars 42A, 42B, 42C, and 42D are arranged in the horizontal direction at intervals from each other. The four bus bars 42A, 42B, 42C, and 42D include portions arranged on the same plane as each other. The four bus bars 42A, 42B, 42C, and 42D are supported by the planar portion 51 of the base plate 41S. Note that, in the present disclosure, “a bus bar is supported by a planar portion” is not limited to a case where the bus bar 42 is housed in the housing portion 55, and can include a case where the bus bar 42 is mounted on the first face 51a or the second face 51b of the planar portion 51, and the like.

[0100] At least a portion of each bus bar 42 is in a plate shape along the horizontal direction. At least a portion of each bus bar 42 is housed in the housing portion 55 and extends along the planar portion 51. That is, at least a portion of each bus bar 42 extends along the first face 51a of the planar portion 51. At least a portion of each bus bar 42 extends in the horizontal direction within the housing portion 55. Hereinafter, a portion of each bus bar 42 that extends in a plate shape along the horizontal direction will be sometimes referred to as a “horizontal plate portion 42p”. The horizontal plate portion 42p is an example of a “plate portion”. The bus bar 42 is a member that forms a current path in the horizontal direction. The bus bar 42 can also be referred to as a “horizontal wiring member”.

[0101] Figure 7 FIG. 19 is a plan view that shows the subunit SUS. Each bus bar 42 has, for example, a connection portion 61, a connection portion 62, and an extension portion 63.

[0102] The connection portion 61 is located at the middle of the bus bar 42 or at the first end portion of the bus bar 42. The connection portion 61 is a portion that is connected to the electronic component 10 (for example, the electronic component 10S) directly or via the connection member 20. The connection portion 61 includes, for example, a portion that overlaps the connection member 20 when viewed in the Z direction. The connection portion 61 is adjacent to the connection member 20 in the Z direction and is connected to the connection member 20 from the Z direction. Instead of the above example, the connection portion 61 can also be connected to the terminal 13 of the electronic component 10 directly from the Z direction, for example, while being adjacent to the terminal 13 of the electronic component 10 in the Z direction.

[0103] The connection portion 62 is located at the middle of the bus bar 42 or the second end portion of the bus bar 42. The connection portion 62 is a portion that is connected to the other electronic component 10 directly or via the other connection member 20. Instead of the above example, the connection portion 62 can be connected to another bus bar 42 (for example, a bus bar 42 included in another subunit SU) or a bus bar 76 for external connection (see Figure 15 ).

[0104] The extension portion 63 extends from the connection portion 61 in the X direction or the Y direction. The extension portion 63 is provided between the connection portion 61 and the connection portion 62. The extension portion 63 extends in a manner that covers the connection portion 61 and the connection portion 62. The extension portion 63 connects the connection portion 61 and the connection portion 62.

[0105] In the present embodiment, the horizontal plate portion 42p described above includes at least all of the connection portion 61 and a part of the extension portion 63. That is, at least all of the connection portion 61 and a part of the extension portion 63 are housed in the housing portion 55 and are located on the same plane.

[0106] In the present embodiment, the extension portions 63 of several bus bars 42 are housed in the housing portion 55, thereby extending in a manner that passes through the region R overlapping the electronic component 10 when viewed in the Z direction and across both sides of the region R. For example, the extension portion 63 extends in a manner that passes across the -Y direction side and the +Y direction side of the region R overlapping the electronic component 10 when viewed in the Z direction. That is, the bus bar 42 is housed in the housing portion 55, thereby not being hindered by the presence of the electronic component 10 and easily routed in a better path (for example, a path with a shorter distance).

[0107] In addition, one or more bus bars 42 can have an extension portion 64 in addition to the connection portion 61, the connection portion 62, and the extension portion 63. The extension portion 64 is a portion in which the bus bar 42 is extended for the purpose of expanding the heat dissipation area and / or expanding the heat capacity for heat storage (heat absorption). The extension portion 64 is a portion that is not used for electrical connection. For example, the extension portion 64 is located on the side opposite the extension portion 63 with respect to the connection portion 61 (or the connection portion 62). The extension portion 64 is plate-shaped in the horizontal direction. The extension portion 64 is included in the horizontal plate portion 42p. The extension portion 64 is housed in the housing portion 55 and extends along the planar portion 51. The extension portion 64 extends to the region R overlapping the electronic component 10 when viewed in the Z direction and has an end portion 42el of the bus bar 42 at a position overlapping the electronic component 10 when viewed in the Z direction.

[0108] Hereinafter, several examples of the arrangement of the bus bar 42 will be described. In addition, the plurality of electronic components 10S includes three electronic components 10A, 10B, 10C. The plurality of connection members 20 includes five connection members 20A, 20B, 20C, 20D, 20E.

[0109] The bus bar 42A has a connection portion 61, a connection portion 62, and an extension portion 63. The connection portion 61 is connected to the terminal 13A of the electronic component 10A via the connection member 20A. The connection portion 62 is disposed at the end portion on the +Y direction side of the sub unit SUS, and is connected to the bus bar 42 included in the other sub unit SU. The extension portion 63 extends across both sides of the region R in which the electronic component 10A is overlapped, by being housed in the housing portion 55.

[0110] The bus bar 42B has a connection portion 61, a connection portion 62, an extension portion 63, and an extension portion 64. The connection portion 61 is connected to the terminal 13B of the electronic component 10A via the connection member 20B. The connection portion 62 is connected to the terminal 13A of the electronic component 10B via the connection member 20C. The extension portion 64 extends to the region R in which the electronic component 10B is overlapped, as viewed in the Z direction, and has an end portion 42e1 of the bus bar 42 at a position in which the electronic component 10B is overlapped.

[0111] The bus bar 42C has a connection portion 61, a second connection portion 62, and an extension portion 63. The connection portion 61 is connected to the terminal 13B of the electronic component 10B via the connection member 20D. The connection portion 62 is disposed at the end portion on the +Y direction side of the sub unit SUS, and is connected to the bus bar 42 included in the other sub unit SU.

[0112] The bus bar 42D has a connection portion 61, a connection portion 62, and an extension portion 63. The connection portion 61 is connected to the terminal 13A of the electronic component 10C via the connection member 20E. The connection portion 62 is disposed at the end portion on the +Y direction side of the sub unit SUS, and is connected to the bus bar 42 included in the other sub unit SU.

[0113] (Exposure structure on the upper surface side of each bus bar)

[0114] In the present embodiment, at least a portion of the bus bar 42 is exposed on the upper surface side of the base plate 41S. For example, the connection portion 61, the connection portion 62, and the extension portion 63 of the bus bar 42 are exposed to the outside of the base plate 41S on the upper surface side (the first face 51a side of the planar portion 51) of the base plate 41S. For example, the extension portion 63 of the bus bar 42 is exposed to the outside of the base plate 41S on the upper surface side of the base plate 41S at least over the entire length between the connection portion 61 and the connection portion 62.

[0115] (Exposure structure on the lower surface side of each bus bar)

[0116] In the present embodiment, at least a portion of the bus bar 42 is exposed on the lower surface side of the base plate 41S. For example, the entire connection portion 61 and at least a portion of the extension portion 63 are exposed on the lower surface side (the second face 51b side of the planar portion 51) of the base plate 41S to the outside of the base plate 41S. In the present embodiment, a gap S1 (refer to Figure 8 ) is formed between the planar portion 51 of the base plate 41S and the metal plate 110. The bus bar 42 includes an exposed portion 42u (refer to Figure 8 ) exposed on the gap S1. The exposed portion 42u includes, for example, the entire connection portion 61 and at least a portion of the extension portion 63.

[0117] <4.3.3 Fastening member>

[0118] Next, the fastening member 43 will be described.

[0119] Figure 8 is a cross-sectional view along the F8-F8 line of the structure shown in Figure 7 . The fastening member 43 is a member for fixing the bus bar 42 and the connection member 20 corresponding to the bus bar 42. The fastening member 43 is, for example, a rivet bolt fixed to the bus bar 42. The fastening member 43 is an example of a "fastening portion".

[0120] In the present embodiment, at least one of the connection portion 61 and the connection portion 62 of the bus bar 42 has a through-hole 42h. The through-hole 42h penetrates the bus bar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion 43a and a head portion 43b. The peripheral surface of the shaft portion 43a has a screw groove. The diameter of the head portion 43b is larger than the diameter of the shaft portion 43a. The fastening member 43 is fixed to the bus bar 42 with the head portion 43b in a state where the shaft portion 43a passes through the through-hole 42h of the bus bar 42. By this fixing, the fastening member 43 is electrically and physically connected to the bus bar 42 in a state where the shaft portion 43a protrudes from the through-hole 42h of the bus bar 42 in the +Z direction. In addition, the fastening member 43 is not limited to rivet fixing, but can be fixed to the bus bar 42 by welding or other methods.

[0121] In the present embodiment, the connection member 20 is mounted to the fastening member 43 in a state where it is first fixed to the electronic member 10 by the fastening member 71. For example, the connection member 20 causes the shaft portion 43a of the fastening member 43 to be inserted into the second mounting hole 22h of the second portion 22. Then, the engagement member 44 (for example, a nut) is caused to engage with the shaft portion 43a of the fastening member 43 protruding from the second mounting hole 22h of the second portion 22 of the connection member 20. The engagement member 44 is mounted to the shaft portion 43a along the Z direction. By this engagement, the second portion 22 of the connection member 20 is fixed to the fastening member 43.

[0122] (Thermally conductive member)

[0123] Here, the heat-conducting component 120 will be described first.

[0124] 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.

[0125] 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.

[0126] 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.

[0127] <4.4 Wiring substrate and electronic component mounting structure>

[0128] Next, the fixing structure of the wiring substrate 40S and the electronic component 10 will be described.

[0129] 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.

[0130] The fixing portion 112 is a fixing portion for fixing the base plate 41S to the metal plate 110. The fixing portion 112 is provided at a position corresponding to the fixing portion 53 of the base plate 41S when viewed in the Z direction. The fixing portion 112 is a boss of a cylindrical or prismatic shape protruding in the +Z direction from the planar portion 111 of the metal plate 110. The fixing portion 112 has an engagement hole 112h which is open in the +Z direction. The inner peripheral surface of the engagement hole 112h has a threaded groove.

[0131] As described above, the fixing portion 53 of the base plate 41S has the mounting hole 53h. The fastening member 115 (e.g., a screw or a bolt) passes through the mounting hole 53h. When the fastening member 115 passing through the mounting hole 53h of the fixing portion 53 of the base plate 41S engages with the engagement hole 112h of the fixing portion 112 of the metal plate 110, the base plate 41S is fixed to the metal plate 110.

[0132] The fixing portion 113 is a fixing portion for directly fixing the electronic component 10 (e.g., the electronic component 10S) to the metal plate 110 without passing through the base plate 41S. The fixing portion 113 is provided at a position corresponding to the mounting portion 14 of the electronic component 10 when viewed in the Z direction. The fixing portion 113 is a boss of a cylindrical or prismatic shape protruding in the +Z direction from the planar portion 111. The fixing portion 113 has an engagement hole 113h which is open in the +Z direction. The inner peripheral surface of the engagement hole 113h has a threaded groove.

[0133] In the present embodiment, the planar portion 51 of the base plate 41S has a through-hole 51h. The through-hole 51h penetrates the planar portion 51 in the Z direction. The through-hole 51h is provided at a position corresponding to the fixing portion 113 of the metal plate 110 when viewed in the Z direction. The fixing portion 113 of the metal plate 110 protrudes through the through-hole 51h of the base plate 41S to the same position as the first face 51a of the planar portion 51 or a position on the +Z direction side from the first face 51a of the planar portion 51. The mounting portion 14 of the electronic component 10 contacts the fixing portion 113 at the same position as the first face 51a of the planar portion 51 or a position on the +Z direction side from the first face 51a of the planar portion 51.

[0134] The fastening member 116 (e.g., a screw or a 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 engagement 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. In addition, instead of the above-described example, the electronic component 10 can be fixed to the fixing portion provided at the base plate 41S.

[0135] <5. Shape example of bus bar>

[0136] Next, a shape example of the bus bar 42 will be described.

[0137] <5.1 First Shape Example of Bus Bar>

[0138] Figure 10 is a plan view for illustrating a first shape example of the bus bar 42. In the present embodiment, the bus bar 42A is an example of the "first bus bar". The connection portion 61 of the bus bar 42A is an example of the "first connection portion". The extension portion 63 of the bus bar 42A includes a first straight portion 63a extending in the Y direction from the connection portion 61 of the bus bar 42A 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 bus bar 42A is an example of the "first extension portion". The connection member 20A is an example of the "first connection member".

[0139] The X-direction width W11 of the connection portion 61 of the bus bar 42A is larger than the X-direction width W12 (for example, the X-direction width W12 of the first straight portion 63a) of the extension portion 63 of the bus bar 42A. In the present embodiment, the connection portion 61 and the first straight portion 63a of the extension portion 63 are housed in the housing portion 55. Also, inside the housing portion 55, the X-direction width W11 of the connection portion 61 of the bus bar 42A is larger than the X-direction width W12 of the extension portion 63 of the bus bar 42A. The width W11 is, for example, the minimum X-direction width of the connection portion 61. The width W12 is, for example, the minimum X-direction width of the extension portion 63 (for example, the minimum X-direction width of the first straight portion 63a).

[0140] In the present embodiment, the X-direction width W12 of the extension portion 63 of the bus bar 42A (for example, the X-direction width W12 of the first straight portion 63a) is the same as or smaller than the X-direction width W13 (refer to Figure 7 ) of the connection member 20A. On the other hand, the X-direction width W11 of the connection portion 61 is larger than the X-direction width W13 of the connection member 20A. The width W13 is, for example, the minimum X-direction width of the connection member 20A.

[0141] The connection portion 61 has an edge 61e1 extending in the Y direction and an edge 61e2 located on the side opposite to the edge 61e1 in the X direction and extending in the Y direction. The edge 61e1 is an example of the "first edge". The edge 61e2 is an example of the "second edge".

[0142] The extension portion 63 (for example, the first straight portion 63a) has an edge 63e1 extending in the Y direction and an edge 63e2 located on the side opposite to the edge 63e1 in the X direction and extending in the Y direction. The edge 63e1 is an example of the "third edge". The edge 63e2 is an example of the "fourth edge".

[0143] 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.

[0144] 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".

[0145] 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).

[0146] 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).

[0147] In the present embodiment, the width W11 of the connecting portion 61 of the bus bar 42A in the X direction is the same as the width W21 of the connecting portion 61 of the bus bar 42B in the X direction. On the other hand, the width W12 of the extension portion 63 of the bus bar 42A in the X direction is smaller than the width W22 of the extension portion 63 of the bus bar 42B in the X direction. The bus bar 42B has, for example, a larger heat dissipation property or a larger heat storage property than the bus bar 42A.

[0148] In the present embodiment, the thermally conductive member 120 has a size that overlaps the connecting portion 61 of the bus bar 42A and the connecting portion 61 of the bus bar 42B when viewed in the Z direction. The thermally conductive member 120 thermally connects the bus bar 42A and the bus bar 42B. Thus, in a case where the temperature of the bus bar 42B is lower than the temperature of the bus bar 42A, a part of the heat of the bus bar 42A moves to the bus bar 42B via the thermally conductive member 120. According to such a structure, by the heat equalization of the plurality of bus bars 42, further improvement of the heat dissipation property of the electrical connection unit 1 can be achieved.

[0149] <5.2 Second Shape Example of Bus Bar>

[0150] Figure 11 is a plan view for illustrating a second shape example of the bus bar 42. In the present embodiment, the electronic component 10A is one example of a "first electronic component". The electronic component 10B is one example of a "second electronic component". The connecting portion 61 of the bus bar 42B is an example of a "first connecting portion". The connecting portion 62 of the bus bar 42B is an example of a "second connecting portion". In the present embodiment, the extension portion 63 of the bus bar 42B has, for example, a first straight portion 63a, a second straight portion 63b, and a third straight portion 63c.

[0151] The first straight portion 63a extends from the connecting portion 61 in a direction different from a direction in which the connecting portion 61 of the bus bar 42B faces the connecting portion 62 at the shortest distance. The first straight portion 63a extends, for example, in the Y direction. The first straight portion 63a is an example of a "first extension portion".

[0152] The first straight portion 63a includes a first end portion (first part) 63aa connected to the connecting portion 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 with respect to the connecting portion 62 in the extension direction (Y direction) of the first straight portion 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) with respect to the connecting portion 62 in the extension direction (Y direction) of the first straight portion 63a.

[0153] In the present embodiment, at least a portion of the first linear portion 63a overlaps the electronic component 10A in the Z direction. For example, the first linear portion 63a extends across the region R in which the electronic component 10A overlaps from the -Y direction side and the +Y direction side of the region R when viewed from the Z direction.

[0154] The second linear portion 63b extends from the second end portion 63ab of the first linear portion 63a toward the connection portion 62 of the bus bar 42B. However, the second linear portion 63b extends, for example, from the second end portion 63ab in a direction different from the direction in which the connection portion 62 of the bus bar 42B is oriented at the shortest distance from the second end portion 63ab of the first linear portion 63a. The second linear portion 63b, for example, is bent from the first linear portion 63a and extends in the X direction. The second linear portion 63b is an example of a "second extension portion". The second linear portion 63b does not overlap any electronic component 10 when viewed from the Z direction.

[0155] The third linear portion 63c extends from the second linear portion 63b toward the connection portion 62 of the bus bar 42B. The third linear portion 63c, for example, extends in the Y direction. In other words, the third linear portion 63c extends in parallel with the first linear portion 63a. The third linear portion 63c is an example of a "third extension portion".

[0156] In the present embodiment, the connection portion 61, the connection portion 62, the first linear portion 63a, the second linear portion 63b, and the third linear portion 63c of the bus bar 42B are included in the horizontal plate portion 42p and are located on the same plane. The connection portion 61, the connection portion 62, the first linear portion 63a, the second linear portion 63b, and the third linear portion 63c of the bus bar 42B are, for example, housed in the housing portion 55.

[0157] In the present embodiment, the width W23 of the second linear portion 63b of the bus bar 42B in the Y direction is greater than the width W22 of the first linear portion 63a of the bus bar 42B in the X direction. The width W22 is, for example, the width of the portion of the bus bar 42B that is located in the region R that overlaps the electronic component 10A when viewed from the Z direction. The width W22 is, for example, the minimum width of the first linear portion 63a in the X direction. The width W23 is, for example, the minimum width of the second linear portion 63b in the Y direction.

[0158] In the present embodiment, at least a portion (for example, all) of the first linear portion 63a and at least a portion (for example, all) of the second linear portion 63b are housed in the housing portion 55. Also, the width W23 of the second linear portion 63b in the Y direction is greater than the width W22 of the first linear portion 63a in the X direction inside the housing portion 55.

[0159] Further, in another view, in the present embodiment, the width W23 of the second straight portion 63b of the bus bar 42B in the Y direction is larger than the width W13 (see Figure 7 ) of the connecting member 20B in the X direction.

[0160] <6. Structure of subunit SUT>

[0161] Next, the structure of the subunit SUT will be described.

[0162] Figure 12 is a perspective view showing the subunit SUT. The subunit SUT includes, for example, a plurality of electronic components 10, a wiring structure body 40T, an auxiliary base member 101 (see Figure 16 ), and a metal member 90 (see Figure 14 ).

[0163] <6.1 Electronic component>

[0164] First, the electronic component 10 will be described. The plurality of electronic components 10 includes a plurality of electronic components 10TA (only one is illustrated in Figure 12 ) and a plurality of electronic components 10TB (only one is illustrated in Figure 12 ). Further, the plurality of electronic components 10 can have only either of the electronic components 10TA and 10TB.

[0165] The electronic component 10TA is one example of the electronic component 10T described above. The electronic component 10TA is an electronic component having a smaller amount of heat generation at the time of energization than the electronic component 10S. On the other hand, the electronic component 10TB is another example of the electronic component 10T described above. The electronic component 10TB is an electronic component having poor mountability (for example, requiring a complicated implementation structure) compared to the electronic component 10S. The electronic component 10TB has, for example, a terminal 13 (see Figure 16 ) projecting in the -Z direction toward the planar portion 111 of the metal plate 110. The electronic component 10TB has, for example, a smaller amount of heat generation at the time of energization than the electronic component 10S.

[0166] Hereinafter, the electronic component 10TA and the electronic component 10TB will be referred to simply as "electronic component 10T" without distinction. The electronic component 10T is, for example, also a connector, a fuse, a capacitor, a branch member, various sensors (for example, a current sensor or a voltage sensor), an electronic control unit, or an electronic component unit in which two or more of them are unitized. However, the type of the electronic component 10T is not limited to the above examples.

[0167] Figure 13is a front view showing the electronic component 10TA. The electronic component 10TA is, for example, an electronic component in which a plurality of terminals 13 are arranged apart from each other at both ends in the horizontal direction of the electronic component 10TA. In the present embodiment, the terminal 13A and the terminal 13B are arranged apart from each other at both ends in the Y direction of the electronic component 10TA. The terminal 13A and the terminal 13B protrude from the central portion in the Z direction of the housing 11 toward the horizontal direction (for example, the +Y direction or the -Y direction). Each terminal 13 has a mounting hole 13h through which a fastening member 43 (for example, a screw or a bolt) passes. The mounting hole 13h is open in the Z direction.

[0168] <6.2 Wiring structure>

[0169] Next, the wiring structure 40T will be described. Figure 12 The wiring structure 40T is a member that forms at least a portion of a power supply path between a plurality of electronic components 10 (for example, a plurality of electronic components 10T) and / or at least a portion of a power supply path between an electronic component 10 (for example, an electronic component 10T) included in a subunit SUT and an electronic component 10 included in another subunit SU (for example, a subunit SUS). The wiring structure 40T includes, for example, a base member 41T, one or more (for example, a plurality of) bus bars 42, and a plurality of fastening members 43. In addition, regarding the fastening members 43, the same content as that of the fastening members 43 described in the subunit SUS is omitted from the description.

[0170] <6.2.1 Base member>

[0171] Figure 14 is a perspective view showing the base member 41T. The base member 41T is a support member that integrally supports a plurality of bus bars 42 arranged apart from each other in the horizontal direction. The base member 41T is, for example, made of synthetic resin and has insulating properties. The base member 41T electrically insulates the plurality of bus bars 42 from each other, for example, by ribs or the like not shown. The base member 41T can also be referred to as an "insulating base material". The base member 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 member 41T has, for example, a support wall 81, a frame portion 85 (a peripheral wall portion), and a fixing portion 87.

[0172] (Support wall)

[0173] The support wall 81 is, for example, a plate-shaped wall portion in the horizontal direction. The plurality of bus bars 42 are arranged on the support wall 81 and are supported from below by the support wall 81 (see Figure 12). In addition, the support wall 81 that supports the bus bar 42 is not limited to a wall portion along the horizontal direction, and can be a lattice-shaped wall portion formed by a plurality of ribs extending in the Z direction, or the like. In the present embodiment, the fastening member 43 is attached to the support wall 81. The fastening member 43 protrudes from the support wall 81 in the +Z direction.

[0174] (Housing portion that houses an electronic component)

[0175] In the present embodiment, the base member 41T has a housing portion 84A that is open to the +Z direction side. The housing portion 84A is, for example, a recess in which a portion of the support wall 81 is recessed in the Z direction, or a through-hole that penetrates the support wall 81 in the Z direction. The housing portion 84A has an outer shape that corresponds to the shape of the housing 11 (i.e., the component main body portion 12) of the electronic component 10 (e.g., the electronic component 10T) when viewed from the Z direction. At least a portion of the electronic component 10 (e.g., the electronic component 10T), such as at least a portion of the component main body portion 12, is housed in the housing portion 84A. At least a portion of the electronic component 10 housed in the housing portion 84A is located on the -Z direction side compared to the support wall 81.

[0176] (Housing portion that houses a metal portion)

[0177] In the present embodiment, the base member 41T has a housing portion 84B that is open to the +Z direction side. The housing portion 84B is, for example, a recess in which a portion of the support wall 81 is recessed in the Z direction, or a through-hole that penetrates the support wall 81 in the Z direction. The housing portion 84B has an outer shape that corresponds to the shape of the metal portion 90 described later when viewed from the Z direction. At least a portion of the metal portion 90 is housed in the housing portion 84B. At least a portion of the metal portion 90 housed in the housing portion 84B is located on the -Z direction side compared to the support wall 81.

[0178] (Box portion)

[0179] The box portion 85 is provided at the peripheral end portion of the base member 41T. The box portion 85 is a rib (peripheral wall portion) that extends in the Z direction at the peripheral end portion of the base member 41T. The width (thickness) H21 of the box portion 85 (peripheral wall portion) in the Z direction is, for example, one-half or more of the width (thickness) H22 of the electronic component 10 (e.g., the electronic component 10TA) in the Z direction (refer to FIG. 17). In addition, the box portion 85 can be omitted. Figure 16 ). In addition, the box portion 85 can be omitted.

[0180] (Fixing portion)

[0181] The fixing portion 87 is a portion that is fixed to the metal plate 110 (refer to FIG. 17). The fixing portion 87 is, for example, a portion of the support wall 81 that is fixed to the metal plate 110. The fixing portion 87 is, for example, a portion of the support wall 81 that is fixed to the metal plate 110. Figure 16). The fixing portion 87 faces the fixing portion 112 of the metal plate 110 in the Z direction. The fixing portion 87 has a mounting hole 87h that penetrates the base member 41T in the Z direction. A fastening member 115 (e.g., a screw or a bolt) passes through the mounting hole 87h. When the fastening member 115 that passes through the mounting hole 87h engages with the engagement hole 112h of the fixing portion 112 of the metal plate 110, the base member 41T is fixed to the metal plate 110.

[0182] <6.2.2 Bus Bar>

[0183] Next, the bus bar 42 included in the wiring structure 40T will be described.

[0184] Figure 15 is a plan view that shows the subunit SUT. The bus bar 42 is a wiring member (an electrical connection member) included in the wiring structure 40T. The bus bar 42 is, for example, a wiring member for electrically connecting a plurality of electronic components 10 (e.g., a plurality of electronic components 10T). Alternatively, the bus bar 42 can be a wiring member for connecting an electronic component 10 (e.g., an electronic component 10T) with an electronic component 10 included in another subunit SU (e.g., a subunit SUS). In the present embodiment, a plurality of bus bars 42 are supported from below by the base member 41T and are arranged at positions away from the metal plate 110. The bus bar 42 is, for example, arranged directly below the terminal 13 of the electronic component 10. The bus bar 42 overlaps the component main body portion 12 of the electronic component 10 when viewed in the X direction or the Y direction (see Figure 17 ).

[0185] The plurality of bus bars 42 include, for example, four bus bars 42E, 42F, 42G, and 42I. The four bus bars 42E, 42F, 42G, and 42I are arranged in the horizontal direction at intervals from each other. The four bus bars 42E, 42F, 42G, and 42I include portions that are arranged on the same plane as each other. At least a portion of each bus bar 42 is a horizontal plate portion 42p. In the present embodiment, each bus bar 42 is plate-shaped along the horizontal direction over the entire length. The horizontal plate portion 42p of each bus bar 42 includes a connection portion 61, a connection portion 62, and an extension portion 63. In the present embodiment, the subunit SUT has the electronic component 10D as one of the electronic components 10TA.

[0186] The connection portion 61 of the bus bar 42E is connected with a bus bar 42 included in the subunit SUS. Likewise, the connection portion 61 of the bus bar 42F is connected with a bus bar 42 included in the subunit SUS. The connection portion 62 of the bus bar 42F is physically and electrically connected with the terminal 13A of the electronic component 10D. For example, the terminal 13A of the electronic component 10D is placed on the horizontal plate portion 42p of the bus bar 42F, and thereby connected with the connection portion 62 of the bus bar 42F.

[0187] The connection portion 61 of the bus bar 42G is physically and electrically connected to the terminal 13B of the electronic component 10D. For example, the terminal 13B of the electronic component 10D is connected to the connection portion 61 of the bus bar 42G by being placed on the horizontal plate portion 42p of the bus bar 42G. The connection portion 61 of the bus bar 42G is an example of the "first connection portion". The connection portion 62 of the bus bar 42G is physically and electrically connected to the bus bar 76 for external connection. The connection portion 62 of the bus bar 42G is connected to an external device via the bus bar 76. The connection portion 62 of the bus bar 42G is an example of the "second connection portion". The bus bar 76 is an example of the "external connection component". In addition, the connection portion 62 of the bus bar 42G can be physically and electrically connected to the terminal 13 of another electronic component 10 instead of the bus bar 76.

[0188] The connection portion 61 of the bus bar 42I is connected to the bus bar 42 included in the sub unit SUS. The connection portion 62 of the bus bar 42I is physically and electrically connected to the terminal 13A of the electronic component 10T, which is not shown.

[0189] <6.3 Auxiliary base component>

[0190] Next, the auxiliary base component 101 will be described.

[0191] Figure 16 is a cross-sectional view along the F16-F16 line of the structure shown in Figure 15 The auxiliary base component 101 is, for example, made of synthetic resin and has insulating properties. A plurality of wirings 102 are provided on the surface of the auxiliary base component 101. The wiring 102 is, for example, a conductive layer (metal layer) provided on the surface of the auxiliary base component 101. The auxiliary base component 101 is disposed in the Z direction between the base component 41T and the planar portion 111 of the metal plate 110. The auxiliary base component 101 faces the electronic component 10TB from the -Z direction side. The terminal 13 of the electronic component 10TB is electrically connected to the wiring 102 provided on the auxiliary base component 101 at a position between the base component 41T and the planar portion 111 of the metal plate 110. The auxiliary base component 101 is an example of the "third base component".

[0192] <6.4 Metal portion>

[0193] <6.4.1 Structure of metal portion>

[0194] Next, with reference to Figure 14 The metal portion 90 will be described. The metal portion 90 is, for example, a structure that reduces thermal interference from an external device on the electronic component 10 included in the sub unit SUT.

[0195] The metal portion 90 is, for example, a heat conducting portion that transmits a part of heat from the external device toward the electronic component 10 (for example, the electronic component 10T) via the bus bar 76 to the planar portion 111 of the metal plate 110 described later. Instead of the above, the metal portion 90 can also be a heat conducting portion that transmits at least a part of heat emitted from the electronic component 10 and / or at least a part of heat emitted from the bus bar 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 bus bar 42 in the Z direction. The planar portion 111 of the metal plate 110 faces the bus bar 42 in the Z direction. The planar portion 111 of the metal plate 110 is an example of the "opposite portion".

[0196] The metal portion 90 is, for example, a heat storage component (heat absorbing component) that increases the heat capacity of the energization path included in the sub unit SUT. The metal portion 90 is, for example, a heat storage component (heat absorbing component) that stores (absorbs) a part of heat from the external device toward the electronic component 10 (for example, the electronic component 10T) via the bus bar 76. Instead of the above, the metal portion 90 can also store (absorb) at least a part of heat emitted from the electronic component 10 and / or at least a part of heat emitted from the bus bar 42 itself. In the case where the metal portion 90 is used as a heat storage component, the metal portion 90 can not be thermally connected to the metal plate 110.

[0197] Figure 17 is a cross-sectional view taken along the F17-F17 line of the structure shown in Figure 15 Figure 18 is a cross-sectional view taken along the F18-F18 line of the structure shown in Figure 15 In the present embodiment, the metal portion 90 is provided separately from the metal plate 110. The metal portion 90 is, for example, a solid metal block. In addition, the shape of the metal portion 90 is not limited to the above example. The metal portion 90 can also be a component having a cross-sectional shape of an I-letter shape, an L-letter shape, or a C-letter shape. The metal portion 90 can also be formed integrally with the base component 41T by insert molding.

[0198] The thickness H31 of the metal portion 90 in the Z direction is thicker than the thickness T1 of the horizontal plate portion 42p of the bus bar 42 in the Z direction. For example, the thickness H31 of the metal portion 90 in the Z direction is twice or more the thickness T1 of the horizontal plate portion 42p of the bus bar 42 in the Z direction.

[0199] In the present embodiment, the width W31 of the metal portion 90 in the X direction is larger than the width W32 of the electronic component 10 in the X direction (refer to Figure 15 In other views, the width W31 of the metal portion 90 in the X direction (refer to Figure 15 ) is larger than the thickness H31 of the metal portion 90 in the Z direction (refer to Figure 18 ).

[0200] ​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.

[0201] 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.

[0202] 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.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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.

[0207] <6.4.2 Examples of Deformations in the Metal Part>

[0208] Next, a deformation example of the metal portion 90 will be described. In each of the deformation examples, the structures other than those described below are the same as those of the first embodiment.

[0209] (First deformation example)

[0210] Figure 19 is a cross-sectional view showing a subunit SUT of the first deformation example. In the above-described embodiment, the metal portion 90 is thermally connected to the metal plate 110 and functions as a heat conduction portion. On the other hand, in the present deformation example, the metal portion 90 is not thermally connected to the metal plate 110. The metal portion 90 functions as a heat storage member (heat absorbing member). For example, a portion of the base member 41T is provided between the metal portion 90 and the metal plate 110.

[0211] (Second deformation example)

[0212] Figure 20 is a cross-sectional view showing a subunit SUT of the second deformation example. In the above-described embodiment, the metal portion 90 is formed separately from the metal plate 110. On the other hand, in the present deformation example, the metal portion 90 and the metal plate 110 are formed as one piece. The metal portion 90 is provided as a portion of the metal plate 110 and is formed integrally with the flat portion 111. The metal portion 90 is a protruding portion that protrudes from the flat portion 111 toward the bus bar 42. In the example shown in Figure 20 , the heat conduction member 120 is arranged between the metal portion 90 and the bus bar 42.

[0213] (Third deformation example)

[0214] Figure 21 is a cross-sectional view showing a subunit SUT of the third deformation example. In the present deformation example, the metal portion 90 is provided by deforming a portion of the flat portion 111 of the metal plate 110 in the +Z direction side by press working or the like. In the present deformation example, the metal portion 90 is also provided as a portion of the metal plate 110 and is formed integrally with the flat portion 111. The metal portion 90 is a protruding portion that protrudes from the flat portion 111 toward the bus bar 42. In the example shown in Figure 21 , the heat conduction member 120 is arranged between the metal portion 90 and the bus bar 42.

[0215] (Fourth deformation example)

[0216] Figure 22is a sectional view showing a subunit SUT of the fourth modification example. In the above-described embodiment, the metal portion 90 is fixed to the extension portion 63 of the bus bar 42. Instead, the metal portion 90 can be fixed to at least one of the connection portion 61 and the connection portion 62 of the bus bar 42. For example, the terminal 13 of the electronic component 10 and the connection portion 61 of the bus bar 42 can be fastened together by the fastening member 117 that fastens the bus bar 42 and the metal portion 90, and the bus bar 76 for external connection and the connection portion 62 of the bus bar 42 can be fastened together. In addition, the metal portion 90 provided in correspondence with the connection portion 61 or the connection portion 62 of the bus bar 42 can have any of the configurations of the first to third modification examples described above.

[0217] <7. Connection structure of subunits>

[0218] Next, the connection structure between the plurality of subunits SU is described.

[0219] Figure 23 is a perspective view showing the connection structure of the subunit SUS and the subunit SUT. In the present embodiment, a step ST based on the difference in height in the Z direction between the base plate 41S of the subunit SUS and the base member 41T of the subunit SUT is formed between the subunit SUS and the subunit SUT. Furthermore, with the step ST, a cross structure in which the bus bar 42 included in the subunit SUS and the bus bar 42 included in the subunit SUT are three-dimensionally crossed is realized.

[0220] For example, the bus bars 42E, 42F, 42I included in the subunit SUT maintain the height in the Z direction supported by the base member 41T and extend to a position overlapping the base plate 41S of the subunit SUS in the Z direction in the -Y direction. The connection portion 61 of each of the bus bars 42E, 42F, 42I is away from the base plate 41S of the subunit SUS in the Z direction and faces the base plate 41S of the subunit SUS in the Z direction.

[0221] On the other hand, the connection portion 62 of the bus bar 42A included in the subunit SUS is raised in the +Z direction with respect to the extension portion 63 of the bus bar 42A and contacts the connection portion 61 of the bus bar 42E from the -Z direction side. The connection portion 62 of the bus bar 42A and the connection portion 61 of the bus bar 42E are fixed by the fastening member 43 and the engagement member 44.

[0222] Similarly, the connection portion 62 of the bus bar 42C included in the subunit SUS is raised in the +Z direction with respect to the extension portion 63 of the bus bar 42C and contacts the connection portion 61 of the bus bar 42I from the -Z direction side. The connection portion 62 of the bus bar 42C and the connection portion 61 of the bus bar 42I are fixed by the fastening member 43 and the engagement member 44.

[0223] The extension 63 of the bus bar 42D included in the sub unit SUS extends in the X direction through between the planar portion 111 of the metal plate 110 and the bus bar 42I. For example, the extension 63 of the bus bar 42D extends across the +X direction side and the -X direction side of the bus bar 42I, passing through a region overlapping the bus bar 42I when viewed in the Z direction. The connection portion 62 of the bus bar 42D is raised in the +Z direction with respect to the extension 63 of the bus bar 42D, and contacts the connection portion 61 of the bus bar 42F from the -Z direction side. The connection portion 62 of the bus bar 42D and the connection portion 61 of the bus bar 42F are fixed by the fastening member 43 and the engagement member 44.

[0224] <8. Extension structure of bus bar>

[0225] Figure 24 is along Figure 15 A cross-sectional view of the F24-F24 line of the structure shown in FIG. 24. In the present embodiment, one bus bar 42 (bus bar 42K) is disposed between the base member 41T and the planar portion 111 of the metal plate 110, extending in the Y direction in the gap S2 between the base member 41T and the planar portion 111 of the metal plate 110. The bus bar 42K extends, for example, across the -Y direction side and the +Y direction side of the base member 41T. The connection portion 61 of the bus bar 42K is physically and electrically connected to the bus bar 42 included in the sub unit SUS. The connection portion 62 of the bus bar 42K is physically and electrically connected to the bus bar 76 for external connection. The bus bar 42K is an example of a "third bus bar".

[0226] <9. Metal plate and insulating cover>

[0227] Next, returning to Figure 2 , the metal plate 110 and the insulating cover 130 will be described.

[0228] <9.1 Metal plate>

[0229] The metal plate 110 is a member that ensures the rigidity of the electrical connection unit 1 and improves the heat dissipation property of the electrical connection unit 1. The metal plate 110 is made of metal (for example, aluminum or an aluminum alloy). The metal plate 110 is an example of a "rigidity member". The metal plate 110 can also be referred to as a "metal member" or a "heat dissipation member".

[0230] The metal plate 110 is rectangular in the X direction and the Y direction. The metal plate 110 has a first end portion 110e1, a second end portion 110e2, a third end portion 110e3, and a fourth end portion 110e4. The first end portion 110e1 and the second end portion 110e2 are a pair of end portions in the long side direction of the metal plate 110, and are separated in the X direction. The third end portion 110e3 and the fourth end portion 110e4 are a pair of end portions 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 flat portion 111, the plurality of fixing portions 112 described above (refer to Figure 9 ), and the plurality of fixing portions 113 described above (refer to Figure 9 ).

[0231] The flat portion 111 is a portion of the metal plate 110 that is formed in a plate shape. The flat portion 111 is plate-shaped in the horizontal direction. The flat portion 111 forms a main portion of the metal plate 110. The flat portion 111 forms a base portion (metal base portion) of the metal plate 110. The flat portion 111 has a size that covers both of the sub-units SU from below.

[0232] In the present embodiment, the flat portion 111 has a first region A1 and a second region A2. The first region A1 is, for example, a region on the -Y direction side in the flat portion 111. The sub-unit SU described above faces the first region A1 of the flat portion 111 when viewed in the Z direction. That is, the plurality of electronic components 10S and the base plate 41S included in the sub-unit SU face the first region A1 of the flat portion 111 in the Z direction.

[0233] The second region A2 is, for example, a region on the +Y direction side in the flat portion 111. The sub-unit ST described above faces the second region A2 of the flat portion 111 when viewed in the Z direction. That is, the plurality of electronic components 10T and the base portion 41T included in the sub-unit ST face the second region A2 of the flat portion 111 in the Z direction.

[0234] <9.2 Insulating cover>

[0235] The insulating cover 130 is a member for preventing a finger from contacting a power supply path of the sub-unit SU. The insulating cover 130 is, for example, made of synthetic resin, and has insulating properties. The insulating cover 130 is, for example, a box shape that is open on the -Z direction side. The insulating cover 130 has a plurality of air holes 130h. The insulating cover 130 covers a portion or all of the corresponding sub-unit SU. In addition, the insulating cover 130 is not limited to a box-shaped member, and can be a sheet-shaped member that covers the power supply path of the main body portion MU. In addition, the insulating cover 130 can be omitted.

[0236] <10. Advantages>

[0237] <A. Advantages related to the division of a plurality of regions in the electrical connection unit>

[0238] As a comparative example, a structure in which an electronic component that should be prioritized in heat dissipation and an electronic component that should be prioritized in mountability are mounted to one base member is considered. In such a structure, in the case of using a thin base member, it is sometimes difficult to improve mountability, and in the case of using a relatively thick base member, it is sometimes difficult to improve heat dissipation.

[0239] On the other hand, the electric connection unit (for example, the electric connection unit 1) of the present embodiment includes a rigid member (for example, the metal plate 110), a first electronic component (for example, the electronic component 10S), a first base member (for example, the base plate 41S), a first bus bar (for example, the bus bars 42A, 42B, 42C, 42D), a second electronic component (for example, the electronic component 10T), a second base member (for example, the base member 41T), and a second bus bar (for example, the bus bars 42E, 42F, 42G, 42I). The above-described rigid member includes a first region (for example, the first region A1) and a second region (for example, the second region A2). The above-described first electronic component faces the above-described first region in a first direction. The above-described first base member faces the above-described first region in the above-described first direction, has a planar portion (for example, the planar portion 51), and is insulative. The above-described first bus bar is supported by the above-described planar portion and is electrically connected to the above-described first electronic component. The above-described second electronic component faces the above-described second region in the above-described first direction and has a smaller heat generation amount than the above-described first electronic component. The above-described second base member has a three-dimensional structure that faces the above-described second region in the above-described first direction and is thicker than the above-described first base member in the above-described first direction, and is insulative. The above-described second bus bar is supported by the above-described second base member and is electrically connected to the above-described second electronic component.

[0240] According to such a structure, by using the first base member having the planar portion, it is possible to arrange the first electronic component that prioritizes heat dissipation in the vicinity of the rigid member and promote the release of heat using the rigid member as a heat dissipation member. On the other hand, by using the second base member having a three-dimensional structure that is thicker in the first direction, it is possible to appropriately mount the second electronic component that prioritizes mountability. By using such regions in a differentiated manner, it is possible to provide an electric connection unit that achieves a balance between heat dissipation and mountability.

[0241] In the present embodiment, the above-described first electronic component faces the above-described planar portion. The above-described second base member has a housing portion (for example, the housing portion 84A) that is recessed toward the above-described first direction or that penetrates the above-described second base member in the above-described first direction. At least a portion of the above-described second electronic component is housed in the above-described housing portion. According to such a structure, it is possible to expose the first electronic component that prioritizes heat dissipation to the outside of the first base member to improve heat dissipation, and arrange the second electronic component in the housing portion of the second base member. According to this structure, even in the case of using a relatively thick second base member, it is possible to achieve thinning of the entire electric connection unit.

[0242] In the present embodiment, the above-described electric connection unit further has a heat conducting member (for example, the heat conducting member 120). The above-described first bus bar includes an exposed portion (for example, the exposed portion 42u) exposed at a gap between the above-described planar portion and the above-described rigid member. The above-described heat conducting member is disposed between the exposed portion of the above-described first bus bar and the above-described rigid member. According to such a structure, the first electronic component, which is valued for heat dissipation, and the rigid member can be more stably thermally connected. Through such thermal connection, further improvement of heat dissipation can be achieved.

[0243] In the present embodiment, the above-described first electronic component has a terminal (for example, the terminal 13) oriented in a second direction different from the above-described first direction. The above-described second electronic component has a terminal (for example, the terminal 13) oriented in the above-described first direction and protruding toward the above-described rigid member. Here, the second electronic component having a terminal oriented in the above-described first direction and protruding toward the above-described rigid member is an electronic component whose mounting structure is likely to become complex. However, by using the second base member portion thicker in the above-described first direction, even the second electronic component whose mounting structure is likely to become complex can be easily and appropriately mounted. Through such a mounting structure, improvement of mountability can be achieved.

[0244] In the present embodiment, the above-described electric connection unit further has a third base member portion (for example, the auxiliary base member portion 101). The above-described third base member portion is disposed between the above-described second base member portion and the above-described rigid member in the above-described first direction, and is provided with a wiring (for example, the wiring 102) electrically connected to a terminal of the above-described second electronic component. According to such a structure, by disposing the above-described third base member portion between the above-described second base member portion and the above-described rigid member, even the second electronic component whose mounting structure is likely to become complex can be easily and appropriately mounted. Through such a mounting structure, improvement of mountability can be achieved.

[0245] In the present embodiment, the above-described second bus bar protrudes from the above-described second base member portion to a position overlapping the above-described first base member portion in the above-described first direction. The above-described first bus bar extends through between the above-described rigid member and the above-described second bus bar. According to such a structure, a crossing structure in which the first bus bar and the second bus bar cross three-dimensionally can be achieved using a difference in thickness between the above-described first base member portion and the above-described second base member portion. Through such a crossing structure, a degree of freedom of wiring and / or a degree of freedom of component disposition within the electric connection unit can be improved.

[0246] In the present embodiment, the above-described electric connection unit further has a third bus bar (for example, 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. According to such a structure, the third bus bar can be disposed using the gap between the above-described second base member and the above-described rigid member. By the disposition of the bus bar, the degree of freedom of the wiring within the electric connection unit and / or the degree of freedom of the component disposition can be improved.

[0247] <B. Advantages Related to the Metal Portion>

[0248] As a comparative example, a structure in which the metal portion 90 is not provided is considered. In such a structure, for example, in a case where 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 disturbance to the electronic component 10 can become large. Therefore, it is sometimes difficult to achieve an improvement in the thermal characteristics.

[0249] On the other hand, the electric connection unit (for example, electric connection unit 1) of the present embodiment has a first electronic component (for example, electronic component 10), a bus bar (for example, bus bar 42), and a metal portion (for example, metal portion 90). The above-described bus bar includes a plate portion (for example, horizontal plate portion 42p) that is electrically connected to the above-described first electronic component. The above-described metal portion faces the above-described bus bar in a thickness direction of the above-described plate portion, that is, a first direction, and is thermally connected to the above-described bus bar. A thickness of the above-described metal portion in the above-described first direction (for example, thickness H31) is two times or more the thickness of the above-described plate portion (for example, thickness T1). According to such a structure, at least a portion of the heat transferred to the above-described bus bar is stored (absorbed) by the above-described metal portion. By this storage action, an improvement in the thermal characteristics of the electric connection unit can be achieved.

[0250] In the present embodiment, the above-described bus bar includes a first connection portion (for example, connection portion 61), a second connection portion (for example, connection portion 62), and an extension portion (for example, extension portion 63). The above-described first connection portion is electrically connected to the above-described first electronic component (for example, electronic component 10). The above-described second connection portion is electrically connected to a second electronic component (for example, electronic component 10) or an external connection component (for example, 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 portion of the above-described metal portion faces the above-described extension portion of the above-described bus bar. According to such a structure, the above-described metal portion can be disposed without interfering with the fastening structure provided to the above-described first connection portion or the above-described second connection portion. By this structure, the degree of freedom of the shape or size of the above-described metal portion is high, and a further improvement in the thermal characteristics of the electric connection unit can be achieved.

[0251] In the present embodiment, in a case where the extending direction of the bus bar 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 metal portion in the third direction is larger than the width of the first electronic component in the third direction. According to such a structure, the metal portion having a larger width than the bus bar is provided, and the heat capacity can be greatly increased by the metal portion. By the increase in the heat capacity, further improvement in the thermal characteristics of the electrical connection unit can be achieved.

[0252] In the present embodiment, the electrical connection unit has a rigid member (for example, the metal plate 110) in addition to the first electronic component, the bus bar, and the metal portion. The rigid member includes an opposing portion (for example, the flat portion 111) facing the bus bar in the first direction. The metal portion is provided as a part of the metal member or separately from the metal member. The metal portion is disposed between the bus bar and the opposing portion in the first direction. According to such a structure, the metal portion can move at least a part of the heat of the bus bar to the rigid member, and the rigid member can be used as a heat dissipation member to emit heat. By the heat dissipation, further improvement in the thermal characteristics of the electrical connection unit can be achieved.

[0253] In the present embodiment, the electrical connection unit further has a heat conductive member. The heat conductive member is disposed between the bus bar and the metal portion, or between the metal portion and the opposing portion. According to such a structure, the thermal connection between the bus bar and the rigid member can be made more robust. By the thermal connection, further improvement in the thermal characteristics of the electrical connection unit can be achieved.

[0254] In the present embodiment, the electrical connection unit further has a base member (for example, the base member 41T). The base member is disposed between the bus bar and the opposing portion in the first direction. The base member supports the bus bar and is insulating. The base member has a housing portion (for example, the housing portion 84B) opening in the first direction. At least a part of the metal portion is disposed in the housing portion. According to such a structure, even if the metal portion is provided, the electrical connection unit can be prevented from being large-sized. By this structure, the electrical connection unit can be easily made small-sized (for example, thin).

[0255] In the present embodiment, the metal portion is a metal block provided separately from the rigid member. According to such a structure, the heat capacity can be more greatly increased by the metal portion. By the increase in the heat capacity, further improvement in the thermal characteristics of the electrical connection unit can be achieved.

[0256] In the present embodiment, the metal portion is a protruding portion provided as a part of the rigid member and protruding from the opposing portion toward the first direction. According to such a structure, the metal portion can be provided using a part of the rigid member. With this structure, it is possible to achieve cost reduction of the electrical connection unit.

[0257] <C. Advantages related to the first shape example of the bus bar>

[0258] As a comparative example, a bus bar in which the width of the connection portion 61 is the same as the width of the extension portion 63 is considered. In such a structure, the temperature locally rises at the connection portion 61 that connects the electronic component 10, compared to the extension portion 63, and sometimes it is difficult to achieve improvement of the thermal characteristics of the electrical connection unit.

[0259] On the other hand, the bus bar of the present embodiment (for example, the bus bar 42) has a first connection portion (for example, the connection portion 61) and a first extension portion (for example, the first linear portion 63a of the extension portion 63). The first connection portion is connected to a first terminal (for example, the terminal 13A) of an electronic component (for example, the electronic component 10) directly or via a first connection member (for example, the connection member 20A). The first extension portion extends from the first connection portion. In a case where 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 (for example, the width W11) of the first connection portion in the third direction is larger than the width (for example, W12) of the first extension portion in the third direction.

[0260] According to such a structure, the width of the first connection portion that connects the electronic component is expanded, and the thermal characteristics (for example, heat storage and / or heat dissipation) of the first connection portion are improved. With this structure, compared to the first extension portion, it is possible to suppress the temperature from locally rising at the first connection portion, and it is possible to achieve improvement of the thermal characteristics of the electrical connection unit.

[0261] In the present embodiment, the first connecting portion has a first edge (e.g., edge 61e1) extending in the second direction and a second edge (e.g., edge 61e2) extending in the second direction on the side opposite the first edge in the third direction. The first extension portion has a third edge (e.g., edge 63e1) extending in the second direction and a fourth edge (e.g., edge 61e2) extending in the second direction on the side opposite the third edge in the third 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. According to such a structure, the width of the first connecting portion is enlarged compared to the first extension portion, and it is easy to arrange other components (e.g., electronic components 10 or bus bars 42) along the first edge and the third edge that are continuous in a straight line. With this structure, it is possible to achieve miniaturization of the electrical connection unit.

[0262] In the present embodiment, the electrical connection unit has a base member (e.g., base plate 41S) in addition to the bus bars. The base member includes a planar portion (e.g., planar portion 51) and is insulating. The base member has a housing portion (e.g., housing portion 55) that is recessed in the first direction or that penetrates the base member in the first direction. At least a portion of the first connecting portion and at least a portion of the first extension portion are housed in the housing portion. Inside the housing portion, the width of the first connecting portion in the third direction is greater than the width of the first extension portion in the third direction. According to such a structure, at least a portion of the first connecting portion and at least a portion of the first extension portion are housed in the housing portion of the base member, so even if the width of the first connecting portion is enlarged compared to the first extension portion, it is not easy for a dead space to occur inside the electrical connection unit. With this structure, it is possible to provide an electrical connection unit that is more advantageous for miniaturization.

[0263] In the present embodiment, the electrical connection unit also has a first connecting member (e.g., connecting member 20A). The width of the first extension portion in the third direction is the same as or smaller than the width (e.g., width W13) of the first connecting member in the third direction. 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. According to such a structure, the first connecting portion is enlarged beyond the width that is originally required. With this structure, it is possible to achieve further improvement of the thermal characteristics of the electrical connection unit.

[0264] The above-described electric connection unit also has a second bus bar (for example, bus bar 42B). The above-described second bus bar includes a second connecting portion (for example, connecting portion 61) and a second extending portion (for example, first linear portion 63a of extending portion 63). The above-described second connecting portion is adjacent to the above-described first connecting portion in the above-described third direction, and is connected to a second terminal (for example, terminal 13B) of the above-described electronic component directly or via a second connecting member (for example, connecting member 20B). The above-described second extending portion is adjacent to the above-described first extending portion in the above-described third direction, and extends from the above-described second connecting portion in the above-described second direction. The above-described first connecting portion projects to a side opposite to the above-described second bus bar with respect to the above-described first extending portion. The above-described second connecting portion projects to a side opposite to the above-described first bus bar with respect to the above-described second extending portion. According to such a structure, even in a case where the first connecting portion of the first bus bar and the second connecting portion of the second bus bar are enlarged in the third direction, respectively, it is possible to arrange the first bus bar and the second bus bar close to each other. With this structure, further miniaturization of the electric connection unit can be achieved.

[0265] <D. Advantages related to the second shape example of the bus bar>

[0266] As a comparative example, a bus bar is considered in which extending portion 63 extends from connecting portion 61 toward connecting portion 62 at the shortest distance. In such a structure, heat easily transfers from connecting portion 61 to connecting portion 62, and sometimes it is difficult to achieve an improvement in the thermal characteristics of the electric connection unit.

[0267] On the other hand, the bus bar (for example, bus bar 42) of the present embodiment has a first connecting portion (for example, connecting portion 61), a second connecting portion (for example, connecting portion 62), a first extending portion (for example, first linear portion 63a of extending portion 63), and a second extending portion (for example, second linear portion 63b of extending portion 63). The above-described first connecting portion is connected to a first electronic component (for example, electronic component 10A) directly or via a connecting member (for example, connecting member 20B). The above-described second connecting portion is connected to a second electronic component (for example, electronic component 10B) directly or via a connecting member (for example, connecting member 20C). The above-described first extending portion extends from the above-described first connecting portion in a direction different from a direction from the above-described first connecting portion toward the above-described second connecting portion. The above-described first extending portion includes a first portion and a second portion. The above-described first portion is connected to the above-described first extending portion. The above-described second portion is located on a side opposite to the above-described first portion with respect to the above-described second connecting portion in an extending direction of the above-described first extending portion. The above-described second extending portion extends from the above-described second portion of the above-described first extending portion toward a direction close to the above-described second connecting portion.

[0268] According to such a structure, the first extension portion does not extend from the first connection portion toward the second connection portion in the shortest distance, but intentionally extends while making a detour. If the bus bar has an extension portion that extends while making a detour, it is possible to improve the thermal characteristics (for example, heat storage and / or heat dissipation) of the portion of the bus bar that extends while making a detour. With this structure, it is possible to achieve an improvement in the thermal characteristics of the electrical connection unit.

[0269] In the present embodiment, the bus bar described above further has a third extension portion (for example, third straight portion 63c). The second extension portion described above extends in a direction different from a direction in which the second portion of the first extension portion extends toward the second connection portion in the shortest distance, in a direction in which the second portion of the first extension portion approaches the second connection portion. According to such a structure, the second extension portion does not extend from the first extension portion toward the second connection portion in the shortest distance, but intentionally extends while making a detour. With this structure, it is possible to further improve the thermal characteristics (for example, heat storage and / or heat dissipation) of the bus bar, and to achieve a further improvement in the thermal characteristics of the electrical connection unit.

[0270] In the present embodiment, the first extension portion described above and the second extension portion described above are located on the same plane. In a case where a thickness direction of the first extension portion and the second extension portion is set as a first direction, an extension direction of the first extension portion is set as a second direction, and an extension direction of the second extension portion is set as a third direction, a width (for example, width W23) of the second extension portion in a direction intersecting the first direction and the third direction is larger than a width (for example, width W22) of the first extension portion in a direction intersecting the first direction and the second direction. According to such a structure, the width of the second extension portion is expanded, and the thermal characteristics (for example, heat storage and / or heat dissipation) of the second extension portion are improved. With this structure, it is possible to suppress a local temperature rise at the first connection portion or the second connection portion, and to achieve an improvement in the thermal characteristics of the electrical connection unit.

[0271] In the present embodiment, the electrical connection unit described above further has an insulating base member (for example, base plate 41S) including a planar portion (for example, planar portion 51). The base member has a housing portion (for example, housing portion 55) that is recessed in a first direction that is a thickness direction of the plate portion or that penetrates the base member in the first direction. At least a portion of the first extension portion and at least a portion of the second extension portion are housed in the housing portion. Inside the housing portion, the width of the second extension portion is larger than the width of the first extension portion. According to such a structure, at least a portion of the first extension portion and at least a portion of the second extension portion are housed in the housing portion of the base member, so even if the width of the second extension portion is expanded compared to the first extension portion, it is not easy to cause a dead space within the electrical connection unit. With this structure, it is possible to provide an electrical connection unit that is more advantageous for miniaturization.

[0272] In the present embodiment, in a case where a thickness direction of the above-described board portion is set as a first direction, at least a part of the above-described first extension portion overlaps the above-described first electronic component in the above-described one direction, and the above-described second extension portion does not overlap the above-described first electronic component and the above-described second electronic component in the above-described first direction. According to such a structure, the width of the above-described second extension portion is expanded in a region where the electronic component does not overlap (a region where the electronic component does not easily hinder heat dissipation). With this structure, heat can be favorably released from the above-described second extension portion whose width is expanded, and further improvement of the thermal characteristics of the electrical connection unit can be achieved.

[0273] <11. Modification>

[0274] Next, several modifications will be described. In each of the modifications, structures other than those described below are the same as those of the above-described embodiment.

[0275] (First Modification)

[0276] The wiring substrate 40S is not limited to a structure in which the base plate 41S and the bus bar 42 are integrated by insert molding. For example, the bus bar 42 can be disposed in the housing portion 55 of the base plate 41S after the base plate 41S is molded with the housing portion 55 provided. In this case, the bus bar 42 can be fixed to the housing portion 55 by fitting or can be fixed to the housing portion 55 by an adhesive or other fixing means. In these cases, potting that fills the gap between the bus bar 42 and the housing portion 55 can be performed.

[0277] (Second Modification)

[0278] The base member of the wiring substrate 40S is not limited to the base plate 41S having the plate-shaped planar portion 51. The wiring substrate 40S can also be a base member (for example, an insulating sheet) having a sheet-shaped planar portion 51. In this case, a part of the planar portion 51 can be formed into the housing portion 55 so as to follow the outer shape of the bus bar 42. Note that in the present disclosure, “sheet-shaped” or “sheet” is not limited to a member having a thickness of 1 mm or more and can also be a member (so-called film) having a thickness of less than 1 mm.

[0279] (Third Modification)

[0280] The base plate 41S of the wiring substrate 40S can include a plurality of members (plate members or sheet members). The plurality of members are provided in a manner of sandwiching the plurality of bus bars 42 arranged in the horizontal direction. For example, the plurality of members are integrated by sandwiching the plurality of bus bars 42, for example, by lamination molding. The plurality of members form the flat portion 51. In this case, the housing portion 55 can also be formed in a hollow shape inside the base plate 41S (between the plurality of members). The plurality of members can be a plurality of plate members, a plurality of sheet members, or a combination of plate members and sheet members. The sheet members can be, for example, sheet members having flexibility. The flat portion 51 formed by the plurality of members has an opening that exposes at least the first connection portion 61 and the second connection portion 62 of the bus bar 42.

[0281] (Fourth Modification)

[0282] The connection of the electronic component 10 to the bus bar 42 is not limited to the connection via the connection member 20. The electronic component 10 can also be directly connected to the bus bar 42 using a fastening member (for example, a bolt, a screw), welding, or the like.

[0283] The above describes several embodiments and modifications. However, the embodiments and modifications are not limited to the above-described examples. For example, the above-described plurality of modifications can be combined with each other.

[0284] Explanation of Reference Numerals

[0285] 1... electrical connection unit

[0286] SU, SUS, SUT... sub unit

[0287] 10, 10S, 10T, 10TA, 10TB... electronic component

[0288] 13, 13A, 13B... terminal

[0289] 20... connection member

[0290] 40S... wiring substrate

[0291] 40T... wiring structure

[0292] 41S... base plate

[0293] 41T... base member

[0294] 42... bus bar

[0295] 51... flat portion

[0296] 52... frame portion

[0297] 55... housing portion

[0298] 61... connection portion

[0299] 62 … connecting portion

[0300] 63 … extending portion

[0301] 63a … first straight portion

[0302] 63aa … first end portion (first part)

[0303] 63ab … second end portion (second part)

[0304] 63b … second straight portion

[0305] 63c … third straight portion

[0306] 84A, 84B … housing portion

[0307] 85 … frame portion

[0308] 90 … metal portion

[0309] 101 … auxiliary base member

[0310] 102 … wiring

[0311] 110 … metal plate (rigid member, metal member, heat dissipation member)

[0312] 111 … flat portion (opposite part)

[0313] 120 … heat conductive member

Claims

1. An electrical connection unit, characterized in that, have: A rigid component, the rigid component comprising a first region and a second region; A first electronic component, the first electronic component facing the first region in a first direction; An insulating first substrate component, the first substrate component facing the first region in the first direction, and including a planar portion; A first busbar, which is supported by the planar portion and electrically connected to the first electronic component; A second electronic component faces the second region in the first direction and generates less heat than the first electronic component; An insulating second substrate component, the second substrate component facing the second region in the first direction, having a three-dimensional structure that is thicker than the first substrate component in the first direction; as well as The second busbar is supported by the second base component and electrically connected to the second electronic component.

2. The electrical connection unit according to claim 1, characterized in that, The first electronic component faces the planar portion in the first direction. The second base component has a receiving portion 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 housed in the housing.

3. The electrical connection unit according to claim 1 or 2, characterized in that, The electrical connection unit also includes a heat-conducting component. The first busbar includes an exposed portion that protrudes from the gap between the planar portion and the rigid member. The heat-conducting component is disposed between the exposed portion of the first busbar and the rigid component.

4. The electrical connection unit according to claim 1 or 2, characterized in that, The first electronic component has terminals oriented in a second direction different from the first direction. The second electronic component has a terminal that protrudes toward the rigid component in the first direction.

5. The electrical connection unit according to claim 4, characterized in that, The electrical connection unit further includes a third base component, which is disposed between the second base component and the rigid component in the first direction, and is provided with wiring that is electrically connected to the terminals of the second electronic component.

6. The electrical connection unit according to claim 1 or 2, characterized in that, The second busbar protrudes from the second base component to a position where it overlaps with the first base component in the first direction. The first busbar extends through the rigid member and the second busbar.

7. The electrical connection unit according to claim 1 or 2, characterized in that, The electrical connection unit further includes a third busbar, which is disposed between the second base component and the rigid component in the first direction and is electrically connected to the first busbar.

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