Electrical connection unit

Abstract

The electrical connection unit includes an electronic component, a heat dissipation member, a first conductive member, a second conductive member, a fastening member, and a heat conduction member. The heat dissipation component is separated from the electronic component in a first direction. The first conduction component is electrically connected with the electronic component. The second conduction component is provided with a connecting part. The connection portion is disposed between the first conductive member and the heat dissipation member in the first direction. The fastening member has a head portion and a shaft portion. The head portion is disposed between the connection portion and the heat dissipation member in the first direction. The shaft portion passes through the connection portion in the first direction and reaches the first conductive member. The heat conducting member is disposed between the head portion and the heat dissipating member in the first direction, and is in contact with the head portion.

Description

Technical Field

[0001] Embodiments of the present invention relate to electrical connection units.

[0002] This application claims priority to Japanese Patent Application No. 2024-087308, filed in Japan on May 29, 2024, the contents of which are incorporated herein by reference. Background Technology

[0003] An electrical connection unit is known to have a housing that accommodates electronic components. Busbars and heat storage material are held within the housing.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2024-037492 Summary of the Invention

[0007] The technical problem that the invention aims to solve

[0008] However, the connections between the busbars and the heat storage components generate heat as resistance increases. Ideally, heat-conducting components should be provided at the connections for heat dissipation. However, currently, bolts are inserted into the housing. Therefore, the surface difference between the busbars and the bolt heads is large, making it impossible to provide heat-conducting components throughout the bolts and busbars, resulting in insufficient thermal conductivity.

[0009] One embodiment provides an electrical connection unit that can improve thermal conductivity.

[0010] Technical means for solving problems

[0011] An electrical connection unit in one embodiment includes an electronic component, a heat dissipation component, a first conductive component, a second conductive component, a fastening component, and a heat-conducting component. The heat dissipation component is separated from the electronic component in a first direction. The first conductive component is electrically connected to the electronic component. The second conductive component has a connecting portion. The connecting portion is disposed in the first direction between at least a portion of the first conductive component and the heat dissipation component. The fastening component has a head and a shaft portion. The head is disposed in the first direction between the connecting portion and the heat dissipation component. The shaft portion passes through the connecting portion in the first direction to reach the first conductive component. At least a portion of the heat-conducting component is disposed in the first direction between the head and the heat dissipation component and contacts the head. The heat-conducting component transfers heat from the head to the heat dissipation component.

[0012] Invention Effects

[0013] According to one embodiment, thermal conductivity can be improved. Attached Figure Description

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

[0015] Figure 2 This is a perspective view of the main body used to illustrate the implementation method.

[0016] Figure 3 This is a perspective view of a subunit used to illustrate the implementation method.

[0017] Figure 4 This is a perspective view showing a partial decomposition of the sub-units of the implementation method.

[0018] Figure 5 This is a perspective view illustrating the electronic components and connecting components of the implementation method.

[0019] Figure 6 This is a perspective view illustrating the electronic components and connecting components of the implementation method.

[0020] Figure 7 This is a perspective view showing the connecting components of the implementation method.

[0021] Figure 8 This is a perspective view showing the wiring substrate according to the embodiment.

[0022] Figure 9 This is a perspective view showing a partial exploded view of the wiring substrate of the embodiment.

[0023] Figure 10 This is a top view showing the wiring substrate of the embodiment.

[0024] Figure 11 This is a perspective view showing a partial disassembly of the electrical connection unit of the embodiment.

[0025] Figure 12 This is a bottom view showing the wiring substrate of the embodiment.

[0026] Figure 13 It is along Figure 10 The cross-sectional view of the structure shown along line F13-F13.

[0027] Figure 14 This is an enlarged cross-sectional view of the fastening component that secures the connecting component to the busbar in the embodiment.

[0028] Figure 15 This is an enlarged sectional view showing a modified example.

[0029] Figure 16 This is an enlarged sectional view showing a modified example.

[0030] Figure 17 This is an enlarged sectional view showing a modified example.

[0031] Explanation of reference numerals in the attached figures

[0032] 1…Electrical connection unit

[0033] 10… Electronic components

[0034] 20…Connecting component (first conductive component)

[0035] 42…Busbar (Second Conductor Component)

[0036] 43… Fastening components

[0037] 43a…shaft portion

[0038] 43b…head

[0039] 61…First connecting part (connecting part)

[0040] 80… Metal plate (heat dissipation component)

[0041] 81… Planar part (base)

[0042] 92… Thermal conductive components

[0043] 92a…Part 1

[0044] 92b…Part Two Detailed Implementation

[0045] Hereinafter, embodiments will be described with reference to the accompanying drawings. In the following description, structures having the same or similar functions will be labeled with the same reference numerals. Furthermore, repeated descriptions of these structures may be omitted. Additionally, the structures described below do not limit the scope of the embodiments.

[0046] In this disclosure, the terms are defined as follows: "Connection" is not limited to mechanical connections and may include electrical connections. That is, "connection" is not limited to the case where two elements are directly connected, but may also include the case where two elements are connected by intervening other elements. "Containment" is not limited to the case where the entire component is contained, but may also include the case where only a portion of the component is contained (the remaining portion of the component protrudes). "Orientation" refers to the overlapping of imaginary projections of two objects when viewed from a specific direction. That is, "orientation" is not limited to the case where two objects are directly facing each other, but may also include the case where two objects are facing each other with other components present between them. "Parallel," "orthogonal," or "identical" may respectively include cases of "approximately parallel," "approximately orthogonal," or "approximately identical."

[0047] In this disclosure, the +X direction, -X direction, +Y direction, -Y direction, +Z direction, and -Z direction are defined as follows. The +X direction is the direction from the first end 80e1 of the metal plate 80 (described later) toward the second end 80e2 (see reference). Figure 11 The -X direction is the opposite of the +X direction. Hereinafter, without distinguishing between the +X and -X directions, it will be simply referred to as the "X direction". The +Y and -Y directions are directions that intersect (e.g., are perpendicular to) the X direction. The +Y direction is the direction from the third end 80e3 of the metal plate 80 described later toward the fourth end 80e4 (see reference). Figure 11 The -Y direction is the opposite of the +Y direction. Hereinafter, without distinguishing between the +Y and -Y directions, it will be simply referred to as the "Y direction". The +Z and -Z directions are directions that intersect (e.g., are orthogonal) the X and Y directions. The +Z direction is the direction from the metal plate 80 described later toward the main body MU (see reference). Figure 1 The -Z direction is the opposite of the +Z direction. Hereinafter, without distinguishing between the +Z and -Z directions, it will be simply referred to as the "Z direction." The Z direction is an example of the "first direction."

[0048] Hereinafter, without distinguishing between the X and Y directions, it will sometimes be referred to as the "horizontal direction". Hereinafter, the Z direction will sometimes be referred to as the "vertical direction". In addition, hereinafter, the +Z direction side will sometimes be referred to as "up" and the -Z direction side will sometimes be referred to as "down". However, these expressions are for ease of explanation and do not limit the direction of gravity of the electrical connection unit 1 (the setting posture of the electrical connection unit 1).

[0049] <1. Structure of the Electrical Connection Unit>

[0050] Figure 1 This is a schematic cross-sectional view illustrating the electrical connection unit 1 according to an embodiment. The electrical connection unit 1 is, for example, an on-board device mounted in vehicles such as EVs (Electric Vehicles), HEVs (Hybrid Electric Vehicles), or PHEVs (Plug-in Hybrid Electric Vehicles). The electrical connection unit 1 may also be referred to as an "electrical connection box" or "junction box." However, the electrical connection unit 1 is not limited to a box-shaped device.

[0051] Electrical connection unit 1, for example, includes a main body MU, a metal plate 80, and an insulating sheet 91 (see reference). Figure 11 ), multiple heat-conducting components 92 and an insulating cover 93.

[0052] <2. Main Body>

[0053] First, let's explain the main body MU.

[0054] Figure 2 This is a perspective view illustrating the main body MU. The main body MU is the part that performs the main functions of the electrical connection unit 1 (e.g., switching of electrical connection states or overcurrent protection). In this embodiment, the main body MU is divided into multiple sub-units SU. The main body MU is formed by connecting multiple sub-units SU. In this embodiment, the main body MU has 3 sub-units SU. Each sub-unit SU can also be referred to as a "circuit structure".

[0055] The three sub-units SU each have different electrical functions. Each sub-unit includes multiple electronic components 10 and a wiring board 40. The multiple electronic components 10 are electrically connected to the wiring board 40.

[0056] In this embodiment, the three sub-units SU are arranged in the X direction. For example, two adjacent sub-units SU in the X direction are electrically connected via a connecting busbar 75. The connecting busbar 75 is arranged on the side opposite to the metal plate 80 relative to the plurality of sub-units SU.

[0057] In this embodiment, three wiring substrates 40 are disposed on the same plane. In other words, the three wiring substrates 40 are disposed at the same height position in the Z direction. The three wiring substrates 40 form a large wiring substrate 40M.

[0058] In this embodiment, the three sub-units SU have the same or similar basic structure. Therefore, the following detailed description will focus on one sub-unit SU as an example.

[0059] Furthermore, instead of the above example, the main body MU may not be divided into multiple sub-units SU. That is, the main body MU may be formed from multiple electronic components 10 and a wiring substrate 40. In addition, two or more sub-units SU are not limited to sub-units SU with different functions, but may also be sub-units SU with the same function.

[0060] <3. Structure of Subunits>

[0061] Next, the structure of the subunit SU will be explained.

[0062] Figure 3 This is a three-dimensional diagram used to illustrate the subunit SU. Figure 4 This is a perspective view showing an exploded portion of a subunit SU. The subunit SU includes, for example, multiple electronic components 10, multiple connecting components 20 for connecting components, multiple connecting components 30 for external connections, a wiring substrate 40, a fastening component 43, and a locking component 44. Connecting components 20 and 30 are components that form vertical electrical paths. Connecting components 20 and 30 can also be referred to as "vertical wiring components." Connecting component 20 is an example of a "first conductive section."

[0063] <3.1 Electronic components and connecting components for connecting components>

[0064] First, the electronic component 10 and the connecting component 20 for connecting the components will be described.

[0065] Electronic component 10 is an electronic component mounted according to the functions required by the subunit SU. Electronic component 10 may be, for example, a connector, fuse, relay (e.g., a mechanical relay or a semiconductor relay), capacitor, branch component, various sensors (e.g., current sensors or voltage sensors), electronic control unit, or an electronic component unit composed of two or more of these. Furthermore, the types of electronic component 10 are not limited to the examples described above. Electronic component 10 may be, for example, a heat-generating component that generates heat when energized. Hereinafter, examples of electronic component 10 will be described, including a first type of electronic component 10M and a second type of electronic component 10N.

[0066] The connecting member 20 is a component that electrically connects the electronic component 10 to the wiring substrate 40. The connecting member 20 forms part of the power path in the subunit SU. The connecting member 20 is made of metal (e.g., copper or copper alloy). The connecting member 20 may also be referred to as a "metal component". Hereinafter, examples of the connecting member 20 will be described, including a first type of connecting member 20M and a second type of connecting member 20N.

[0067] <3.1.1 Type 1 Electronic Components>

[0068] Figure 5 This is a perspective view showing a first type of electronic component 10M and a first type of connecting component 20M. The first type of electronic component 10M is an electronic component in which a plurality of terminals 13 are arranged at one end. The electronic component 10M, for example, has a housing 11, a component body 12, a plurality of terminals 13, and a plurality of mounting portions 14.

[0069] (case)

[0070] The housing 11 is the outer contour component that forms most of the external shape of the electronic component 10M. The housing 11 is made of, for example, synthetic resin and has insulating properties. The housing 11 houses the main body portion 12 of the component. Alternatively, the housing 11 and the main body portion 12 of the component can be formed integrally.

[0071] In this embodiment, the housing 11 has an insulating rib 11a that protrudes in a horizontal direction (e.g., the X direction) and extends in a Z direction. The insulating rib 11a is, for example, plate-shaped along both the horizontal (e.g., X direction) and Z direction. The insulating rib 11a extends, for example, along the entire length of the housing 11 in the Z direction. The insulating rib 11a is disposed between a plurality of terminals 13 (terminals 13A and 13B, described later). The insulating rib 11a electrically insulates the terminals 13A and 13B from each other. Additionally, in this embodiment, a portion of the insulating rib 11a is disposed between the first portions 21 (described later) of two connecting members 20M connected to the electronic component 10M. The insulating rib 11a electrically insulates the first portions 21 of the two connecting members 20M connected to the electronic component 10M from each other.

[0072] (Main body of the component)

[0073] The main body 12 is the part that performs the main functions of the electronic component 10M. For example, if the electronic component 10M is a relay, the main body 12 includes a switching part (e.g., a contact part) that switches between an on and off state. For example, if the electronic component 10M is a fuse, the main body 12 includes a fuse-breaking part that melts when an overcurrent flows. For example, if the electronic component 10M is a capacitor, the main body 12 includes a part that stores charge.

[0074] (terminal)

[0075] Terminal 13 is an electrical connection portion exposed to the outside of housing 11. Terminal 13 is electrically connected to the main body 12 of component inside housing 11. In this embodiment, electronic component 10M includes terminals 13A and 13B as a plurality of terminals 13. One of terminals 13A and 13B is a positive terminal. The other of terminals 13A and 13B is a negative terminal.

[0076] In this embodiment, terminals 13A and 13B are disposed at one end of the electronic component 10M in the horizontal direction (e.g., the X direction). Terminals 13A and 13B are arranged side by side in the horizontal direction (e.g., the Y direction). Each terminal 13 has a mounting hole 13h for mounting a fastening member 71 (e.g., a screw or bolt) as described later. The mounting hole 13h is open in the horizontal direction (e.g., the X direction). The inner circumferential surface of the mounting hole 13h of the electronic component 10M has a threaded groove.

[0077] (Installation Department)

[0078] Mounting section 14 is a part used to fix electronic component 10M. Mounting section 14 has fastening components 112 (e.g., screws or bolts, see below) for fastening later. Figure 11The mounting hole 14h is open in the Z direction. The mounting hole 14h is a through hole through which the fastening member 112 passes. The mounting part 14 is directly fixed to the metal plate 80 by the fastening member 112.

[0079] <3.1.2 Type 1 Connecting Components>

[0080] The first type of connecting member 20M is a member that electrically connects the first type of electronic component 10M to the wiring substrate 40. In this embodiment, the connecting member 20M connects the electronic component 10M to the busbar 42 (see reference 40) included in the wiring substrate 40. Figure 8 Electrical connection. In this embodiment, the width of the connecting member 20M in the long side direction (e.g., the X direction) of the electronic component 10M is smaller than the width of the electronic component 10M in the long side direction. The connecting member 20M has, for example, a first portion 21 and a second portion 22.

[0081] (Part 1)

[0082] The first portion 21 of the connecting member 20M is the portion that connects to the terminal 13 of the electronic component 10M. The first portion 21 is a plate-shaped or cuboid portion extending along the Z direction. The first portion 21 extends along one end of the electronic component 10M (e.g., the end in the X direction). The first portion 21 is an erected portion in the Z direction relative to the wiring substrate 40 (e.g., relative to the busbar 42 described later). The first portion 21 is adjacent to the electronic component 10M in the horizontal direction (e.g., the X direction). For example, the first portion 21 is adjacent to the terminal 13 of the electronic component 10M in the horizontal direction (e.g., the X direction) and connected to the terminal 13 of the electronic component 10M from the horizontal direction (e.g., the X direction).

[0083] The first portion 21 of the connecting member 20M has a first mounting hole 21h through which a fastening member 71 (e.g., a screw or bolt) passes. The first mounting hole 21h is open in a horizontal direction (e.g., the X direction). Additionally, the first portion 21 has a recess 25 around the first mounting hole 21h. The recess 25 is a receiving portion that accommodates the head of the fastening member 71 inserted into the first mounting hole 21h. By engaging the fastening member 71 passing through the first mounting hole 21h with the mounting hole 13h of the terminal 13 of the electronic component 10M, the first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10M. Alternatively, the first portion 21 may not have the recess 25.

[0084] (Part Two)

[0085] The second part 22 of the connecting component 20M is connected to the busbar 42 (see reference). Figure 8The second part 22 protrudes horizontally (e.g., in the X direction) from the end of the first part 21 on the -Z direction side. The second part 22 is a plate portion along the horizontal direction. The second part 22 is adjacent to the busbar 42 in the Z direction and is connected to the busbar 42 in the Z direction. The second part 22 of the connecting member 20M is mounted from the Z direction to the fastening member 43 (e.g., screw or bolt, see below) which protrudes from the busbar 42 in the +Z direction. Figure 8 It is physically and electrically connected to the busbar 42. In this embodiment, the second portion 22 of the connecting member 20M 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 second mounting hole 22h of the second portion 22 is through which the fastening member 43 passes. And, by using the engaging member 44 (e.g., a nut, see below) described later. Figure 3 The first part 21 engages with the end of the fastening member 43 passing through the second mounting hole 22h, thereby fixing the second part 22 to the busbar 42. In this embodiment, a connecting member 20M is formed in an L-shape by the first part 21 and the second part 22.

[0086] <3.1.3 Second Type of Electronic Components>

[0087] Figure 6 This is a perspective view showing a second type of electronic component 10N and a second type of connecting component 20N. The second type of electronic component 10N is an electronic component with two terminals 13 separately disposed at both ends in the horizontal direction. The electronic component 10N, for example, has a housing 11, a main body 12, and a plurality of terminals 13. Furthermore, in the structure of the electronic component 10N, structures having the same function as electronic component 10M are labeled with the same reference numerals. In this case, for the description of the electronic component 10N, "electronic component 10M" in the above description of electronic component 10M will be replaced with "electronic component 10N".

[0088] In electronic component 10N, terminals 13A and 13B are separately disposed at opposite ends of electronic component 10N in the horizontal direction (e.g., the X direction). Each terminal 13 has a mounting hole 13h for mounting a fastening component 72 (e.g., a screw or bolt). The mounting hole 13h opens in the Z direction. For example, the mounting hole 13h of electronic component 10N is a through hole through which the fastening component 72 passes.

[0089] <3.1.4 Second type of connecting component>

[0090] The second type of connection member 20N is a member that electrically connects the second type of electronic component 10N to the wiring substrate 40. In this embodiment, the connection member 20N connects the electronic component 10N to the busbar 42 (see reference 40) included in the wiring substrate 40. Figure 8 Electrical connection. In this embodiment, the width of the connecting member 20N in the long side direction (e.g., the X direction) of the electronic member 10N is smaller than the width of the electronic member 10N in the long side direction. The connecting member 20N has, for example, a first portion 21, a second portion 22, and a third portion 23.

[0091] (Part 1)

[0092] The first portion 21 of the connecting member 20N is the portion that connects to the terminal 13 of the electronic component 10N. The first portion 21 is a cuboid portion extending in the Z direction. The first portion 21 is an upright portion that stands upright in the Z direction relative to the wiring substrate 40 (e.g., relative to the busbar 42). The first portion 21 is adjacent to the terminal 13 of the electronic component 10N in the Z direction and is connected to the terminal 13 of the electronic component 10N from the Z direction. The first portion 21 of the connecting member 20N has a first mounting hole 21h for engaging with the fastening member 72. The first mounting hole 21h is open in the Z direction. The inner peripheral surface of the first mounting hole 21h of the connecting member 20N has a threaded groove. By engaging the fastening member 72, which passes through the mounting hole 13h of the terminal 13 of the electronic component 10N, with the first mounting hole 21h of the first portion 21, the first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10N.

[0093] (Part Two)

[0094] The second part 22 of the connecting component 20N is connected to the busbar 42 (see reference). Figure 8 The second part 22 protrudes horizontally (e.g., in the X direction) from the end of the first part 21 on the -Z direction side. The second part 22 is a plate portion along the horizontal direction. The second part 22 is adjacent to the busbar 42 in the Z direction and is connected to the busbar 42 in the Z direction. The second part 22 of the connecting member 20N is mounted in the Z direction to a fastening member 43 (e.g., a screw or bolt, see reference 43) protruding from the busbar 42 in the +Z direction. Figure 8 It is physically and electrically connected to the busbar 42. In this embodiment, the second portion 22 of the connecting member 20N has a second mounting hole 22h through which the fastening member 43 passes. The second mounting hole 22h opens in the Z direction. In the second portion 22, the fastening member 43, described later, passes through the second mounting hole 22h. And, by engaging the engaging member 44 (e.g., a nut, see...) Figure 3 The second part 22 engages with the end of the fastening member 43 that passes through the second mounting hole 22h, thereby fixing the second part 22 to the busbar 42.

[0095] (Part Three)

[0096] The third part 23 is an upright wall (side wall) that rises from both ends of the second part 22 in the horizontal direction towards the +Z direction. The third part 23 is a wall along the Z direction. The third part 23 is connected to the first part 21 and to the second part 22. The third part 23 extends obliquely, for example, in a manner that widens in the X direction as it moves towards the -Z direction. Furthermore, the third part 23 may also be provided in the aforementioned connecting member 20M. On the other hand, the connecting member 20N may not have the third part 23.

[0097] <3.2 Connecting components for external connections>

[0098] Next, the connecting component 30 for external connection will be described.

[0099] Figure 7 This is a perspective view showing the connection member 30 for external connection. The connection member 30 is a component that electrically connects the external connection busbar 76 to the wiring substrate 40. In this embodiment, the connection member 30 connects the external connection busbar 76 to the busbar 42 (see reference 40) included in the wiring substrate 40. Figure 8 Electrical connection. The external connection is electrically connected to the external device via busbar 76. In this disclosure, "external device" refers to an electrical device located outside the electrical connection unit 1. External devices may be, for example, a battery cell mounted on a vehicle, or an inverter for driving a vehicle's motor, but are not limited to these examples. The connection component 30 may have, for example, a first portion 31, a second portion 32, and a third portion 33.

[0100] (Part 1)

[0101] The first part 31 is the portion connected to the external connection busbar 76. The first part 31 is a cuboid portion extending along the Z direction. The first part 31 is an erected portion that stands upright in the Z direction relative to the wiring substrate 40 (e.g., relative to the busbar 42). The first part 31 is adjacent to and connected to the external connection busbar 76 in the Z direction. The first part 31 has a first mounting hole 31h through which a fastening member 73 (e.g., a screw or bolt) passes. The first mounting hole 31h is open in the Z direction. The inner circumferential surface of the first mounting hole 31h has a threaded groove. By engaging the fastening member 73, which passes through the mounting hole 76h of the external connection busbar 76, with the first mounting hole 31h of the first part 31, the first part 31 is physically and electrically connected to the external connection busbar 76.

[0102] (Part Two)

[0103] Part 2, 32, is related to busbar 42 (see reference). Figure 8The second part 32 protrudes horizontally (e.g., in the X direction) from the end of the first part 31 on the -Z direction side. The second part 32 is a plate portion along the horizontal direction. The second part 32 is adjacent to and connected to the busbar 42 in the Z direction. The second part 32 is mounted in the Z direction to a fastening member 43 (e.g., a screw or bolt, see reference 42) protruding in the +Z direction from the busbar 42. Figure 8 The second part 32 is physically and electrically connected to the busbar 42. In this embodiment, the second part 32 has a second mounting hole 32h through which the fastening member 43 passes. The second mounting hole 32h opens in the Z direction. In the second part 32, the fastening member 43, described later, passes through the second mounting hole 32h. And, by engaging the locking member 44 (e.g., a nut, see...) Figure 3 The second part 32 engages with the end of the fastening member 43 that passes through the second mounting hole 32h, thereby fixing the second part 32 to the busbar 42.

[0104] (Part Three)

[0105] The third part 33 is an upright wall (side wall) that rises from both ends of the second part 32 in the horizontal direction toward the +Z direction. The third part 33 is a wall along the Z direction. The third part 33 is connected to the first part 31 and to the second part 32. The third part 33 extends obliquely, for example, in a manner that widens in the X direction (or Y direction) as it moves toward the -Z direction. Alternatively, the connecting member 30 may not have the third part 33.

[0106] <3.3 Substrate for Wiring>

[0107] Next, the wiring substrate 40 will be described.

[0108] Figure 8 This is a perspective view showing a wiring substrate 40. The wiring substrate 40 is a component that forms at least a portion of the power path between a plurality of electronic components 10 and / or at least a portion of the power path between an electronic component 10 and an external device. In this disclosure, "wiring substrate" refers to a substrate-type wiring structure. "Substrate-type" means that, regardless of its fine shape, it is plate-shaped along a plane when viewed as a whole. It should be noted that in this disclosure, "plate-shaped," "sheet-shaped," or "plane" is not limited to a completely flat case, and may include cases where there are fixing structures, ribs, etc., that protrude in the Z direction locally, or cases where there are uneven shapes on the surface that follow the thickness of the busbar, etc. In this embodiment, the wiring substrate 40 is plate-shaped along both the X and Y directions.

[0109] The wiring substrate 40 includes, for example, a base plate 41 and one or more busbars 42. In this embodiment, the base plate 41 and the multiple busbars 42 are integrated by insert molding. For example, after the fastening member 43 is fixed to the busbar 42, the busbar 42 is insert-molded with the base plate 41, thereby forming the wiring substrate 40 into a sheet-like component. That is, the busbar 42 is integrated with the base plate 41 without using fastening members such as screws or bolts.

[0110] Figure 9 This is an exploded perspective view of a portion of the wiring substrate 40. Hereinafter, for ease of explanation, the substrate 41 and busbar 42 will be described with reference to the exploded view of the wiring substrate 40.

[0111] (Substrate board)

[0112] The substrate 41 is a retaining member that holds together a plurality of busbars 42 arranged horizontally at intervals. The substrate 41 is, for example, made of synthetic resin and has insulating properties. The substrate 41 electrically insulates the plurality of busbars 42 from each other. The substrate 41 may also be referred to as an "insulating substrate". The substrate 41 is fixed to the metal plate 80, for example, by fastening components such as bolts and screws. The substrate 41, for example, has a flat portion 51.

[0113] The planar portion 51 is a plate-shaped portion formed in the substrate plate 41. The planar portion 51 is plate-shaped along the horizontal direction. The planar portion 51 forms the main portion of the substrate plate 41. The planar portion 51 is the base (insulating base) of the substrate plate 41. In this embodiment, the planar portion 51 extends across the entire width of the substrate plate 41 in the X direction and across the entire width of the substrate plate 41 in the Y direction, except for the four corners of the substrate plate 41. The thickness direction (plate thickness direction) of the planar portion 51 is the Z direction.

[0114] The planar portion 51 has multiple through holes 51h for inserting the fixing portion 83 (described later) of the metal plate 80. Additionally, the planar portion 51 has, for example, one or more receiving portions 55 that respectively receive the busbar 42. The multiple receiving portions 55 are formed separately from each other in the X or Y direction. For example, five receiving portions 55 are provided. Each receiving portion 55 has, for example, a through hole that penetrates the planar portion 51 in the Z direction. When viewed from the Z direction, each receiving portion 55 has a shape corresponding to the shape of the received busbar 42. It should be noted that in this invention, "the receiving portion penetrates the planar portion in the first direction (Z direction)" may also include a portion of the total length of the receiving portion 55 penetrating the planar portion 51 in the Z direction (for example, the remaining portion of the receiving portion 55 may be a recessed pit in the Z direction, or it may be a form provided inside the base plate 41 without being exposed to the outside of the base plate 41).

[0115] (Busbar)

[0116] Busbar 42 is a wiring component (electrical connection component) included in the wiring substrate 40. Busbar 42 is, for example, a wiring component for electrically connecting multiple electronic components 10. Busbar 42 is an example of a "second conductive component". Alternatively, busbar 42 can also be a wiring component for connecting electronic components 10 to external devices. Busbar 42 is made of metal (e.g., copper or copper alloy) and is conductive. In this embodiment, the wiring substrate 40 has one busbar 42 in each receiving portion 55. That is, in the illustrated example, the wiring substrate 40 has a total of five busbars 42. The five busbars 42 are arranged horizontally with a gap between them. The five busbars 42 include portions arranged on the same plane. The five busbars 42 are held by the flat portion 51 of the substrate 41.

[0117] At least a portion of each busbar 42 is plate-shaped along the horizontal direction. At least a portion of each busbar 42 is received in a receiving portion 55 and extends along a planar portion 51. At least a portion of each busbar 42 extends horizontally within the receiving portion 55. In this embodiment, each busbar 42 is plate-shaped along the entire horizontal direction. Each busbar 42 is received in the receiving portion 55 along its entire length and extends along the planar portion 51. The upper surface of each busbar 42 is exposed upwards, and the lower surface of each busbar 42 is exposed downwards. The busbar 42 is a component that forms a horizontal power path. The busbar 42 may also be referred to as a "horizontal wiring component".

[0118] Figure 10 This is a plan view showing the wiring substrate 40. Each busbar 42 has, for example, a first connecting portion 61, a second connecting portion 62, and an extension portion 63.

[0119] The first connecting portion 61 is the portion that contacts a connecting member 20 (hereinafter referred to as "first connecting member 20"). The first connecting member 20 is a connecting member that connects an electronic component 10 (hereinafter referred to as "first electronic component 10") to the busbar 42. The first connecting portion 61 is the portion of the busbar 42 that overlaps with the first connecting member 20 when viewed from the Z direction. The first connecting portion 61 is disposed in the Z direction between the second portion 22 of the first connecting member 20 and the metal plate 80. The first connecting portion 61 is an example of a "connecting portion". The first connecting portion 61 is adjacent to the first connecting member 20 in the Z direction and is connected to the first connecting member 20 from the Z direction.

[0120] The second connecting portion 62 is the portion that contacts other connecting members 20 (hereinafter referred to as "second connecting members 20"). The second connecting member 20 is a connecting member that connects other electronic components 10 (hereinafter referred to as "second electronic components 10") included in a plurality of electronic components 10 to the busbar 42. The second connecting portion 62 is the portion of the busbar 42 that overlaps with the second connecting member 20 when viewed from the Z direction. The second connecting portion 62 is adjacent to the second connecting member 20 in the Z direction and is connected to the second connecting member 20 from the Z direction.

[0121] Alternatively, the second connecting portion 62 may be a portion that contacts other connecting members 30 (hereinafter referred to as "second connecting member 30") instead of the example described above. The connecting member 30 is a connecting member used to connect an external device to the busbar 42. In this case, the second connecting portion 62 is the portion of the busbar 42 that overlaps with the second connecting member 30 when viewed from the Z direction. The second connecting portion 62 is adjacent to the second connecting member 30 in the Z direction and is connected to the second connecting member 30 from the Z direction.

[0122] Alternatively, the second connecting portion 62 may be a portion that contacts the connecting busbar 75 for connecting to other subunits SU without contacting the connecting members 20 and 30. In this case, the second connecting portion 62 is the portion of the busbar 42 that overlaps with the connecting busbar 75 when viewed from the Z direction. The second connecting portion 62 is adjacent to and connected to the connecting busbar 75 in the Z direction.

[0123] An extension 63 extends from the first connecting portion 61 along the X or Y direction. The extension 63 is disposed between the first connecting portion 61 and the second connecting portion 62. The extension 63 extends across the first connecting portion 61 and the second connecting portion 62. The extension 63 connects the first connecting portion 61 and the second connecting portion 62.

[0124] In this embodiment, the first connecting portion 61, the second connecting portion 62, and the extension portion 63 are plate-shaped along the horizontal direction. In this embodiment, each busbar 42 is housed in the housing portion 55 and extends along the planar portion 51, at least covering the first connecting portion 61 and the second connecting portion 62. For example, the first connecting portion 61, the second connecting portion 62, and the extension portion 63 are housed in the housing portion 55 and extend along the planar portion 51.

[0125] In this embodiment, some extensions 63 of the busbars 42 are housed in the housing 55, extending through the region R that overlaps with the electronic component 10 when viewed from the Z direction and across both sides of the region R. For example, the extensions 63 extend in a straight line along the X direction. The extensions 63 extend through the region R that overlaps with the electronic component 10 when viewed from the Z direction and across the +X and -X direction sides of the region R. That is, since the busbars 42 are housed in the housing 55, they are not hindered by the presence of the electronic component 10 and can be easily laid out with a better path (e.g., a shorter path).

[0126] In addition, one or more busbars 42 may have an extension 64 in addition to the first connecting portion 61, the second connecting portion 62, and the extension portion 63. The extension portion 64 is a portion of the busbar 42 extended for the purpose of increasing the heat dissipation area and / or increasing the heat capacity for heat storage (heat absorption). The extension portion 64 is not used for electrical connection. For example, the extension portion 64 is located on the side opposite to the extension portion 63 relative to the first connecting portion 61 (or the second connecting portion 62). The extension portion 64 is plate-shaped along the horizontal direction. 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 that overlaps with the electronic component 10 when viewed from the Z direction, and has the end 42e1 of the busbar 42 at the position where it overlaps with the electronic component 10 when viewed from the Z direction.

[0127] <3.4 Fastening and Engaging Components>

[0128] Next, fastening component 43 and engaging component 44 (see reference) Figure 3 The fastening component 43 is used to secure the busbar 42 to the connecting component (connecting component 20, connecting component 30, or connecting busbar 75) of the busbar 42. The structure of the fastening component 43 and the engaging component 44 will be described in detail later.

[0129] <4. Metal plates, insulating sheets, heat-conducting components, and insulating covers>

[0130] Next, the metal plate 80, the insulating sheet 91, the heat-conducting component 92, and the insulating cover 93 will be described.

[0131] <4.1 Metal Plate>

[0132] Figure 11 This is a perspective view showing a partial exploded view of the electrical connection unit 1. The metal plate 80 ensures the rigidity of the electrical connection unit 1. The metal plate 80 is an example of a "heat dissipation component" that improves the heat dissipation of the electrical connection unit 1. The metal plate 80 is made of metal (e.g., aluminum or aluminum alloy). The metal plate 80 can also be referred to as a "rigid component".

[0133] The metal plate 80 is rectangular in shape along the X direction when viewed from the Z direction. The metal plate 80 has a first end 80e1, a second end 80e2, a third end 80e3, and a fourth end 80e4. The first end 80e1 and the second end 80e2 are a pair of ends along the long side of the metal plate 80, separated in the X direction. The third end 80e3 and the fourth end 80e4 are a pair of ends along the short side of the metal plate 80, separated in the Y direction. The metal plate 80 is separated from the electronic component 10 in the Z direction. The metal plate 80 includes, for example, a planar portion 81 and a plurality of fixing portions 83.

[0134] The planar portion 81 is a plate-shaped portion formed in the metal plate 80. The planar portion 81 is plate-shaped along the horizontal direction. The planar portion 81 forms the main portion of the metal plate 80. The planar portion 81 is the base (metal base) of the metal plate 80. In this embodiment, the planar portion 81 has a size that covers three sub-units SU from below. The planar portion 81 faces the wiring substrate 40 of the three sub-units SU. In this embodiment, the metal plate 80 and the planar portion 51 of each sub-unit SU are separated by a gap S1 (see reference). Figure 13 ) location configuration.

[0135] The fixing part 83 is used to directly fix the electronic components 10 of each sub-unit SU to the metal plate 80 without passing through the base plate 41. The fixing part 83 is inserted into the through hole 51h of the flat part 51 of the base plate 41. When viewed from the Z direction, the fixing part 83 is provided at a position corresponding to the mounting part 14 of the electronic components 10 of each sub-unit SU. The fixing part 83 is a cylindrical or prismatic boss that protrudes from the flat part 81 in the +Z direction. The mounting part 14 of the electronic components 10 is fixed to the fixing part 83 by the fastening member 112.

[0136] <4.2 Insulating Sheets>

[0137] The insulating sheet 91 is an insulating component used to electrically insulate the metal plate 80 from the busbars 42 of each subunit SU. The insulating sheet 91 is made of a synthetic resin such as polyester or polyimide and has insulating properties. The insulating sheet 91 is rectangular in shape when viewed from the Z-direction. The insulating sheet 91 is sheet-like along the horizontal direction. The insulating sheet 91 is disposed between the planar portion 81 of the metal plate 80 and the wiring substrate 40 of each subunit SU. For example, the insulating sheet 91 is disposed between the planar portion 81 of the metal plate 80 and a plurality of heat-conducting components 92.

[0138] In this embodiment, the insulating sheet 91 is adhered to the flat portion 81 of the metal plate 80. The insulating sheet 91 has a cut or opening to avoid the portion protruding in the +Z direction, such as the fixing portion 83 of the metal plate 80. Alternatively, the insulating sheet 91 may be provided between the wiring substrate 40 of each subunit SU and the plurality of heat-conducting components 92, instead of the example described above. Furthermore, if the heat-conducting components 92 are insulating and the necessary insulation is ensured by the heat-conducting components 92, the insulating sheet 91 may be omitted.

[0139] <4.3 Thermal Conductive Components>

[0140] The thermally conductive component 92 is a component used to transfer heat generated by the electronic component 10 when energized and / or the heat (Joule heat) generated by the busbar 42 itself when energized to the metal plate 80. The thermally conductive component 92 is, for example, a flexible thermally conductive sheet (e.g., a thermally conductive silicone sheet). The thermally conductive component 92 is formed, for example, of a material with a higher thermal conductivity than the substrate plate 41. However, the thermally conductive component 92 is not limited to the above examples and may also be a thermally conductive component formed of thermally conductive gel or other materials.

[0141] Figure 12 This is a bottom view showing the wiring substrate 40. In this embodiment, a plurality of heat-conducting components 92 are partially disposed in the wiring substrate 40. The heat-conducting components 92 are mounted on the lower surface of each busbar 42. In addition, the width (e.g., the width in the Y direction) of the heat-conducting components 92 is designed to be slightly smaller than the width (e.g., the width in the Y direction) of the corresponding busbar 42. The configuration of the heat-conducting components 92 will be described in detail later.

[0142] <4.4 Insulating Cover>

[0143] return Figure 1 The insulating cover 93 will be described below. The insulating cover 93 is a component used to prevent contact with the electrical path of the main body MU. The insulating cover 93 is, for example, made of synthetic resin and has insulating properties. The insulating cover 93 is, for example, a box-shaped component open in the -Z direction. The insulating cover 93 has multiple vent holes 93h. The insulating cover 93 is mounted relative to the metal plate 80 along the Z direction. Furthermore, the insulating cover 93 is not limited to a box-shaped component; it can also be a sheet-shaped component that covers the electrical path of the main body MU.

[0144] <5. Related Structures of Connecting Components>

[0145] return Figure 3 The structure related to the connecting component 20 will be described.

[0146] In this embodiment, the connecting member 20 (e.g., connecting member 20M and connecting member 20N) is a heat storage member (heat absorption member) that increases the heat capacity of the energizing path of the electrical connection unit 1. The connecting member 20, for example, stores (absorbs) at least a portion of the heat emitted by the electronic component 10. Alternatively / otherwise, the connecting member 20 may also store (absorb) at least a portion of the heat emitted by the busbar 42 itself due to energizing. The connecting member 20 may also be referred to as a "heat storage member" or a "heat absorption member".

[0147] Figure 13 It is along Figure 10 The cross-sectional view of the structure shown is along line F13-F13.

[0148] In this embodiment, the busbar 42 is positioned away from the terminal 13 of the electronic component 10 (e.g., away in the Z direction). The connecting member 20 is positioned between the electronic component 10 and the busbar 42. In this invention, "the connecting member is positioned between the electronic component and the busbar" is not limited to the case where a portion of the connecting member is located between the electronic component and the busbar when viewed from the X or Y direction. "The connecting member is positioned between the electronic component and the busbar" can also be equivalent to the case where a portion of the connecting member is located between the electronic component and the busbar when viewed from a direction inclined relative to the X or Y direction. The connecting member 20 electrically connects the terminal 13 of the electronic component 10 to the busbar 42.

[0149] Additionally, return Figure 5 , Figure 6 In this embodiment, the thickness of at least a portion of the connecting member 20 is greater than the thickness (Z-direction thickness) T3 of the busbar 42. For example, the thickness T1 in the X-direction of at least a portion of the connecting member 20 is greater than the thickness T3 of the busbar 42. In this embodiment, the thickness T1 in the X-direction of the first portion 21 of the connecting member 20 is greater than the thickness T3 of the busbar 42. In this embodiment, the first portion 21 has a thickness T1 in the X-direction that is greater than the thickness T3 of the busbar 42 along its entire Z-direction length. The thickness T1 in the X-direction of the first portion 21 of the connecting member 20 is, for example, more than twice the thickness T3 of the busbar 42. Alternatively, in other embodiments, the thickness T2 in the Z-direction of the second portion 22 of the connecting member 20 may also be greater than the thickness T3 of the busbar 42.

[0150] In this embodiment, the thickness T1 in the X direction of the first portion 21 of the connecting member 20 is greater than the thickness T2 in the Z direction of the second portion 22 of the connecting member 20. In this embodiment, the first portion 21 has a thickness T1 in the X direction that is greater than the thickness T2 in the Z direction of the second portion 22, which is the thickness of the first portion 21 extending along its entire length in the Z direction.

[0151] Furthermore, the aforementioned dimensional relationships are also the same in the connecting member 30 for connecting the external busbar 76. For example, regarding the description of the connecting member 30, in the above description of the connecting member 20, simply replace "connecting member 20" with "connecting member 30", "first part 21" with "first part 31", and "second part 22" with "second part 32".

[0152] <6. Structure of the busbar>

[0153] Next, return Figure 13 The structure related to busbar 42 will be described below. Busbar 42 is formed to be slightly thicker than the substrate 41. That is, the thickness T3 of busbar 42 in the Z direction is greater than the thickness T4 of substrate 41 in the Z direction. The upper surface of busbar 42 is located slightly above the upper surface of substrate 41, and the lower surface of busbar 42 is located slightly below the lower surface of substrate 41. In the illustrated example, connecting components 20, 30 and electronic component 10 are mounted on busbar 42 and arranged with a slight gap relative to substrate 41. In addition, the thickness T3 of busbar 42 in the Z direction is equal to the thickness T4 of substrate 41 in the Z direction, and the upper surface of busbar 42 can be located on the same plane as the upper surface of substrate 41, and the lower surface of busbar 42 can be located on the same plane as the lower surface of substrate 41.

[0154] <7. Fastening components and the surrounding structure of the fastening components>

[0155] Next, the structure of the fastening component 43 and its surrounding area will be described. Hereinafter, the structure of the fastening component 43 and its surrounding area will be described using the fastening component 43, which fastens the first type of connecting component 20M to the busbar 42, as an example.

[0156] Fastening component 43 is a component used to secure the busbar 42 to the connecting component (connecting component 20, connecting component 30, or connecting busbar 75) of the busbar 42. Fastening component 43 is, for example, a riveting bolt fixed to the busbar 42.

[0157] In this embodiment, the first connecting portion 61 and the second connecting portion 62 of the busbar 42 each have a through hole 42h. The through hole 42h extends through the busbar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion 43a and a head 43b.

[0158] Figure 14 This is an enlarged cross-sectional view of the fastening member 43 that secures the connecting member 20 to the busbar 42 in the embodiment.

[0159] The shaft portion 43a passes through the first connecting portion 61 in the Z direction, reaching the second portion 22 of the connecting member 20. The circumferential surface of the shaft portion 43a has a threaded groove. The head 43b is disposed in the Z direction between the first connecting portion 61 of the busbar 42 and the metal plate 80. With the shaft portion 43a passing through the through hole 42h of the busbar 42, the head 43b of the fastening member 43 is riveted and fixed to the busbar 42. Through this fixation, with the shaft portion 43a protruding from the through hole 42h of the busbar 42 in the +Z direction, the fastening member 43 is electrically and physically connected to the busbar 42.

[0160] The head 43b is formed as a circular plate extending along the Z direction and along the XY direction. The diameter of the head 43b is larger than the diameter of the shaft portion 43a. Furthermore, the shape of the head 43b can be appropriately varied. For example, the head 43b can also be formed as a polygonal plate. However, the shape of the head 43b is preferably a circular plate. Additionally, the diameter (horizontal dimension) of the head 43b can be appropriately varied. The diameter of the head 43b can be smaller than, equal to, or larger than the diameter of the engaging member 44. The shaft portion 43a extends from the upper surface of the head 43b along the central axis of the head 43b in the +Z direction. The head 43b abuts against the first connecting portion 61 of the busbar 42 from the -Z direction. The thickness T5 of the head 43b in the Z direction is smaller than the plate thickness T3 of the first connecting portion 61. Furthermore, the thickness T5 of the head 43b in the Z direction is smaller than the plate thickness T4 of the base plate 41. Furthermore, the thickness T5 in the Z direction of the head 43b is smaller than the thickness T6 in the Z direction of the heat-conducting component 92. The head 43b is preferably designed to be as thin as possible in the Z direction.

[0161] In this embodiment, the connecting member 20 is first fixed to the electronic component 10 by the fastening member 71 or the fastening member 72, and then mounted to the fastening member 43 in the Z direction. For example, the connecting member 20 is used to insert the shaft portion 43a of the fastening member 43 into the second mounting hole 22h of the second part 22. Then, the engaging member 44 (e.g., a nut) engages with the shaft portion 43a of the fastening member 43, which protrudes from the second mounting hole 22h of the second part 22 of the connecting member 20. The engaging member 44 is mounted, for example, at the upper end of the shaft portion 43a along the Z direction. The head 43b of the fastening member 43 and the engaging member 44 press the connecting member 20 and the busbar 42 from both sides in the Z direction. Through this engagement, the connecting member 20 is fixed to the fastening member 43.

[0162] In this embodiment, the heat-conducting component 92 includes a first portion 92a and a second portion 92b. The first portion 92a is disposed in the Z direction between the head 43b and the metal plate 80 and contacts the head 43b. The second portion 92b is disposed in the Z direction between the first connecting portion 61 and the metal plate 80 and contacts the first connecting portion 61. The heat-conducting component 92 transfers heat from the head 43b toward the metal plate.

[0163] Furthermore, the heat-conducting component 92 is an elastic sheet. Therefore, the head 43b of the fastening component 43 is pressed into the heat-conducting component 92. In other words, the head 43b enters the recess 92c created by the pressing of the head 43b by the heat-conducting component 92.

[0164] <8. Advantages>

[0165] In the aforementioned electrical connection unit 1, heat is generated at the connection points between conductive components such as the connection member 20 (heat storage member) and the busbar 42, due to increased resistance. Therefore, it is necessary to dissipate the heat generated at the connection points between these conductive components to the outside.

[0166] Here, as a comparative example, consider an electrical connection unit in which the bolts securing the connecting component (heat storage component) to the busbar are inserted through the outside of the metal plate. In such a comparative example, for example, a heat-conducting component positioned between the busbar and the metal plate cannot be configured at the bolt mounting location. Therefore, it is sometimes impossible to efficiently release the heat generated at the connection between the connecting component and the busbar to the metal plate.

[0167] On the other hand, in this embodiment, the electrical connection unit 1 includes an electronic component 10, a metal plate 80, a connecting member 20, a busbar 42, a fastening member 43, and a heat-conducting member 92. The metal plate 80 is separated from the electronic component 10 in the Z direction. The connecting member 20 is electrically connected to the electronic component 10. The busbar 42 has a first connecting portion 61. The first connecting portion 61 is disposed in the Z direction between at least a portion of the connecting member 20 and the metal plate 80. The fastening member 43 has a head 43b and a shaft portion 43a. The head 43b is disposed in the Z direction between the first connecting portion 61 and the metal plate 80. The shaft portion 43a passes through the first connecting portion 61 in the Z direction and reaches the connecting member 20. At least a portion of the heat-conducting member 92 is disposed in the Z direction between the head 43b and the metal plate 80 and is in contact with the head 43b. The heat-conducting member 92 transfers heat from the head 43b to the metal plate 80.

[0168] With this structure, the first connecting portion 61 of the busbar 42 can abut against the head 43b of the fastening member 43. Due to this mounting position of the head 43b, the surface difference (height difference in the Z direction) between the first connecting portion 61 and the head 43b is reduced. Therefore, a heat-conducting member 92 can be disposed between the head 43b and the metal plate 80. This heat-conducting member 92 facilitates heat transfer from the electronic component 10 and the like to the metal plate 80. Therefore, the thermal conductivity of the electrical connection unit 1 is improved.

[0169] In this embodiment, the heat-conducting component 92 includes a first portion 92a and a second portion 92b. The first portion is disposed in the Z direction between the head 43b and the metal plate 80, and contacts the head 43b. The second portion 92b is disposed in the Z direction between the first connecting portion 61 of the busbar 42 and the metal plate 80, and contacts the first connecting portion 61. With this structure, the heat-conducting component 92 can be provided throughout both the busbar 42 and the fastening component 43. By configuring the heat-conducting component 92 in this way, heat from the busbar 42 can be easily transferred to the metal plate 80 via the heat-conducting component 92, thereby improving thermal conductivity.

[0170] In this embodiment, the thickness T5 in the Z direction of the head 43b is smaller than the plate thickness T3 of the first connecting portion 61. With this structure, the surface difference between the first connecting portion 61 of the busbar 42 and the head 43b of the fastening member 43 is further reduced, making it easier for heat to be transferred to the metal plate 80. Furthermore, heat-conducting members 92 can be easily provided throughout both the busbar 42 and the fastening member 43.

[0171] In this embodiment, the thickness T5 in the Z direction of the head 43b is smaller than the thickness T6 in the Z direction of the heat-conducting component 92. With this structure, the surface difference between the first connecting portion 61 of the busbar 42 and the head 43b of the fastening component 43 is further reduced, facilitating heat transfer to the metal plate 80. Furthermore, since the heat-conducting component 92 is thicker than the head 43b of the fastening component 43, it is easy to provide the heat-conducting component 92 throughout both the busbar 42 and the fastening component 43.

[0172] In this embodiment, the heat-conducting component 92 is a flexible heat-conducting sheet. With this structure, the heat-conducting component 92 can be positioned such that the head 43b of the fastening component 43 is embedded within it. This ensures that the heat-conducting component 92 is in close contact with the fastening component 43, thereby improving thermal conductivity. Furthermore, it helps to prevent the electrical connection unit 1 from becoming too large in the Z direction. Additionally, since the head 43b of the fastening component 43 enters the recess 92c of the heat-conducting component 92, the contact area between the head 43b and the heat-conducting component 92 will not become unstable.

[0173] In this embodiment, a metal plate 80 is used as an example of a heat dissipation component. The metal plate 80 includes a plate-shaped planar portion 81 (base) extending in a direction intersecting the Z direction. A heat-conducting component 92 is disposed in the Z direction between the head 43b and the planar portion 81 of the metal plate 80. With this structure, the rigidity of the electrical connection unit 1 is ensured, and heat within the electrical connection unit 1 is effectively released to the outside.

[0174] <9. Variations>

[0175] Next, several variations will be described. Furthermore, in each variation, the structure other than that described below is the same as the structure of the embodiment.

[0176] Figure 15 This is an enlarged sectional view showing a modified example. Figure 15 Corresponding to Figure 14 A sectional view. For example... Figure 15 As shown, the head 43b of the fastening component 43 can also be fixed to the busbar 42 by riveting, thereby partially or completely embedded in the first connecting portion 61 of the busbar 42. That is, part or all of the head 43b can also be disposed in the recess 45 on the lower surface of the busbar 42, in which case the surface difference (height difference in the Z direction) between the head 43b and the busbar 42 is further reduced.

[0177] In the above embodiments, a metal plate 80 is cited as an example of a heat dissipation component, but it is not limited to this. The heat dissipation component may be, for example, a resin plate. Furthermore, a first-type connecting member 20M is cited as an example of a first conductive component, and a busbar 42 is cited as an example of a second conductive component, but it is not limited to this. The first conductive component may also be a conductive component different from the first-type connecting member 20M mounted on the heat dissipation component (metal plate 80 in this embodiment) (e.g., a second-type connecting member 20N, connecting member 30, busbar 42, connecting busbar 75, etc.). The second conductive component may also be a conductive component different from the busbar 42 mounted on the heat dissipation component (metal plate 80 in this embodiment) (e.g., connecting member 20, connecting member 30, connecting busbar 75, etc.). Furthermore, a first connecting portion 61 of the busbar 42 is cited as an example of a connecting portion of the second conductive component, but it is not limited to this. The connecting portion of the second conductive component may also be a portion other than the first connecting portion 61 of the busbar 42, such as the second connecting portion 62 of the busbar 42.

[0178] Figure 16 This is an enlarged sectional view showing another variation. For example... Figure 16As shown, the structure of the fastening member 43 and the heat-conducting member 92 described above can also be used, for example, for the connection portion of the busbar 75 and the busbar 42. As described above, the connecting busbar 75 is a member that connects two adjacent sub-units SU. The connecting busbar 75 is electrically connected to the electronic component 10, for example, via the busbar 42. In this case, the connecting busbar 75 becomes the first conductive member, and the second connecting portion 62 of the busbar 42 becomes the connecting portion of the second conductive member. The head 43b of the fastening member 43 is disposed in the Z direction between the second connecting portion 62 of the busbar 42 and the metal plate 80. In addition, the shaft portion 43a of the fastening member 43 passes through the second connecting portion 62 and reaches the connecting busbar 75. The heat-conducting member 92 has a first portion 92a and a second portion 92b, similar to the case where it is disposed at the connection portion between the connecting member 20 and the busbar 42. The first portion 92a is disposed in the Z direction between the head 43b and the metal plate 80 and contacts the head 43b. The second part 92b contacts the second connecting portion 62 of the busbar 42 in the Z direction. The dimensional relationship of the head 43b is the same as in the embodiment described above.

[0179] Figure 17 This is an enlarged sectional view showing another variation. For example... Figure 17 As shown, the structure of the fastening member 43 and the heat-conducting member 92 described above can also be used, for example, for the connection portion between the external connection member 30 and the busbar 42. In this case, the connection member 30 becomes the first conductive member, and the second connecting portion 62 of the busbar 42 becomes the connecting portion of the second conductive member. The head 43b of the fastening member 43 is disposed in the Z direction between the second connecting portion 62 of the busbar 42 and the metal plate 80. In addition, the shaft portion 43a of the fastening member 43 passes through the second connecting portion 62 and reaches the connection member 30. The heat-conducting member 92 has a first portion 92a and a second portion 92b, similar to the case where it is disposed at the connection portion between the connection member 30 and the busbar 42. The first portion 92a is disposed in the Z direction between the head 43b and the metal plate 80 and contacts the head 43b. The second portion 92b contacts the second connecting portion 62 of the busbar 42 in the Z direction. In this case, the dimensional relationship of the head 43b is also the same as in the embodiment described above.

[0180] In addition, the structures of the fastening component 43 and the heat-conducting component 92 described above, besides the above-described embodiments and variations, can also be used, for example, for connecting the components 20 to each other.

[0181] Furthermore, the base component of the wiring substrate 40 is not limited to a base plate 41 having a plate-shaped planar portion 51. The wiring substrate 40 may also be a base component having a thin film-shaped planar portion 51 (e.g., an insulating film). In this case, the receiving portion 55 may be formed by making a portion of the planar portion 51 follow the shape of the busbar 42. It should be noted that in the present invention, "sheet-like" or "sheet" is not limited to a component with a thickness of 1 mm or more, and may also be a component with a thickness of less than 1 mm (a so-called film).

[0182] The substrate 41 of the wiring substrate 40 may include multiple components (plate components or sheet components). These multiple components are arranged such that multiple busbars 42 arranged horizontally are sandwiched between them, for example, from both sides in the Z direction. For example, the multiple components may be integrally formed by sandwiching the multiple busbars 42 together through lamination. The multiple components form a planar portion 51. In this case, a receiving portion 55 may also be formed hollow inside the substrate 41 (between the multiple components). The multiple components may be multiple plate components, multiple sheet components, or a combination of plate components and sheet components. A sheet component may, for example, be a flexible sheet component. The planar portion 51 formed by the multiple components has an opening that exposes at least the first connecting portion 61 and the second connecting portion 62 of the busbars 42. For example, in this case, the receiving portion 55 formed between the multiple components is equivalent to an example of a "receiving portion recessed in the first direction (Z direction)".

[0183] The above describes several embodiments and variations. However, the embodiments and variations are not limited to the examples described above. For example, multiple embodiments can be combined with each other. The above embodiments can be implemented in various other ways, and various additions, omissions, substitutions, and modifications can be made without departing from the spirit of the present invention.

[0184] [Potential for Industrial Applications]

[0185] According to the present invention, thermal conductivity can be improved.

Claims

1. An electrical connection unit, characterized in that, include: Electronic components; A heat dissipation component, which is separated from the electronic component in a first direction; A first conductive component is electrically connected to the electronic component; The second conductive component has a connection portion disposed in the first direction between at least a portion of the first conductive component and the heat dissipation component; A fastening component having: a head disposed in the first direction between the connecting portion and the heat dissipation component; and a shaft portion passing through the connecting portion in the first direction to reach the first conductive component; as well as A heat-conducting component, at least a portion of which is disposed between the head and the heat dissipation component in the first direction and in contact with the head to transfer heat from the head toward the heat dissipation component.

2. The electrical connection unit according to claim 1, characterized in that, The heat-conducting component includes: a first portion, which is disposed in the first direction between the head and the heat dissipation component and contacts the head; and a second portion, which is disposed in the first direction between the connecting portion and the heat dissipation component and contacts the connecting portion.

3. The electrical connection unit according to claim 1 or 2, characterized in that, The thickness of the head in the first direction is smaller than the thickness of the connector in the first direction.

4. The electrical connection unit according to claim 1 or 2, characterized in that, The thickness of the head in the first direction is smaller than the thickness of the heat-conducting component in the first direction.

5. The electrical connection unit according to claim 1 or 2, characterized in that, The heat-conducting component is an elastic heat-conducting sheet.

6. The electrical connection unit according to claim 1 or 2, characterized in that, The heat dissipation component is a metal plate comprising a plate-shaped base extending along a direction intersecting the first direction. The heat-conducting component is disposed in the first direction between the head and the base of the metal plate.

Images