Electrical connection unit

Abstract

The electrical connection unit has a first electronic component, a base member, and a first bus bar. The first electronic component has a first terminal. The base member includes a planar portion, and when the thickness direction of the planar portion is defined as a first direction, the planar portion includes a housing portion that is recessed in the first direction or penetrates the planar portion in the first direction, and the base member is insulating. At least a portion of the first bus bar is housed in the housing portion, extends along the flat surface portion, and is electrically connected to the first electronic component. The planar portion has an opening that penetrates the planar portion in the first direction and is disposed along at least one of a portion of an outer shape of the bus bar and a portion of an outer shape of the first electronic component.

Description

Technical Field

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

[0002] This application claims priority to Japanese Patent Application No. 2024-087326, 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, which has a housing for accommodating electronic components and a busbar mounted in an upright position on 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 problem that the invention aims to solve

[0008] However, further reductions in the thickness of electrical connection units are expected.

[0009] One embodiment provides an electrical connection unit that enables thinning.

[0010] Technical solutions for solving the problem

[0011] One embodiment of the electrical connection unit includes a first electronic component, a base component, and a first busbar. The first electronic component has a first terminal. The base component includes a plate-like or sheet-like planar portion, wherein, with the thickness direction of the planar portion as a first direction, the planar portion includes a receiving portion recessed in the first direction or extending through the planar portion in the first direction, and the base component is insulating. At least a portion of the first busbar is received in the receiving portion and extends along the planar portion, and is electrically connected to the first electronic component. The planar portion has an opening extending through the planar portion in the first direction and is disposed along at least one of a portion of the outline of the first busbar and a portion of the outline of the first electronic component.

[0012] Invention Effects

[0013] According to one embodiment, the electrical connection unit can be made thinner. 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 portion of the sub-units of the implementation method exploded.

[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 embodiment.

[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 an exploded view of a portion 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 an exploded view of a portion of the connection unit in 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 It is along Figure 10 The cross-sectional view of the structure shown along line F14-F14. Detailed Implementation

[0028] 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.

[0029] 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."

[0030] 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 direction opposite to the +Z direction. Hereinafter, without distinguishing between the +Z and -Z directions, it will be simply referred to as the "Z direction." The Z direction is an example of the "first direction." The X direction is an example of the "second direction." The Y direction is an example of the "third direction." Furthermore, the "second direction" is not limited to the X direction; it can also be the Y direction or other directions. The "third direction" is not limited to the Y direction; it can also be a direction intersecting the "first direction" and the "second direction."

[0031] 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).

[0032] (First Implementation)

[0033] <1. Structure of the electrical connection unit>

[0034] Figure 1 This is a cross-sectional view showing the electrical connection unit 1 according to the first embodiment. The electrical connection unit 1 is, for example, an on-board device installed 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.

[0035] 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.

[0036] <2. Main Body>

[0037] First, let's explain the main body MU.

[0038] Figure 2 This is a perspective view illustrating the main body MU. The main body MU is the part that implements 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 (sub-units SUX, SUY, and SUZ). Each sub-unit SU can also be referred to as a "circuit structure".

[0039] The sub-unit SUX has a primary electrical function. The sub-unit SUX includes, for example, multiple electronic components 10X and a first wiring substrate 40X. The multiple electronic components 10X are electrically connected to the first wiring substrate 40X.

[0040] The subunit SUY has a secondary electrical function. This secondary function is different from the primary function. The subunit SUY includes, for example, multiple electronic components 10Y and a second wiring substrate 40Y. The multiple electronic components 10Y are electrically connected to the second wiring substrate 40Y.

[0041] The subunit SUZ has a third electrical function. This third function is different from the first and second functions. The subunit SUZ includes, for example, multiple electronic components 10Z and a third wiring substrate 40Z. The multiple electronic components 10Z are electrically connected to the third wiring substrate 40Z.

[0042] In this embodiment, three sub-units SUX, SUY, and SUZ are arranged in the X direction. For example, sub-unit SUX is positioned relative to sub-unit SUY in the +X direction. Sub-units SUX and SUY are electrically connected via multiple connecting busbars 75 spanning the first wiring substrate 40X and the second wiring substrate 40Y. On the other hand, sub-unit SUZ is positioned relative to sub-unit SUY in the -X direction. Sub-units SUZ and SUY are connected via multiple connecting busbars 75 spanning the third wiring substrate 40Z and the second wiring substrate 40Y (in... Figure 2 (Only one is shown in the figure) and electrically connected. The connecting busbar 75 is arranged on the side opposite to the metal plate 80 relative to the multiple sub-units SU.

[0043] In this embodiment, the three wiring substrates 40X, 40Y, and 40Z contained in the three subunits SUX, SUY, and SUZ are arranged on the same plane. In other words, the three wiring substrates 40X, 40Y, and 40Z are arranged at the same height position in the Z direction. Therefore, the three wiring substrates 40X, 40Y, and 40Z form a large wiring substrate 40M.

[0044] In this embodiment, the three subunits SUX, SUY, and SUZ have the same or similar basic structures. Therefore, the following detailed description will focus on one subunit SU. Hereinafter, without distinguishing between the subunit SUX, subunit SUY, and subunit SUZ, they will be simply referred to as "subunit SU". Furthermore, without distinguishing between electronic component 10X, electronic component 10Y, and electronic component 10Z, they will be simply referred to as "electronic component 10". Furthermore, without distinguishing between the first wiring substrate 40X, the second wiring substrate 40Y, and the third wiring substrate 40Z, they will be simply referred to as "wiring substrate 40". The single subunit SU included in the three subunits SUX, SUY, and SUZ is an example of a "first subunit". On the other hand, the other subunits SU included in the three subunits SUX, SUY, and SUZ are examples of "second subunits".

[0045] 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.

[0046] <3. Structure of Subunits>

[0047] Next, the structure of the subunit SU will be explained.

[0048] Figure 3 This is a three-dimensional diagram used to illustrate the subunit SU. Figure 4 This is a perspective view showing a portion of a subunit SU exploded. The subunit SU includes, for example, multiple electronic components 10, multiple connecting components 20 for connecting components, multiple connecting components 30 for external connections, and a wiring substrate 40. The connecting components 20 and 30 are components that form vertical power paths. The connecting components 20 and 30 can also be referred to as "vertical wiring components."

[0049] <3.1 Electronic components and connecting components for connecting components>

[0050] First, the electronic component 10 and the connecting component 20 for connecting the components will be described.

[0051] 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.

[0052] 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.

[0053] <3.1.1 Type 1 Electronic Components>

[0054] 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.

[0055] (case)

[0056] 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.

[0057] 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.

[0058] (Main body of the component)

[0059] 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.

[0060] (terminal)

[0061] 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 terminal on the positive side. The other of terminals 13A and 13B is a terminal on the negative side. One of terminals 13A and 13B is an example of a "first terminal". The other of terminals 13A and 13B is an example of a "second terminal".

[0062] 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.

[0063] (Installation Department)

[0064] 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 11 The mounting hole 14h is for installation. The mounting hole 14h is open in the Z direction. The mounting hole 14h is a through hole through which the fastening member 112 passes. The object to be fastened to the mounting part 14 will be described later.

[0065] <3.1.2 Type 1 Connecting Components>

[0066] 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 L12 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 L11 in the long side direction of the electronic component 10M. The connecting member 20M has, for example, a first portion 21 and a second portion 22.

[0067] (Part 1)

[0068] 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).

[0069] 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.

[0070] (Part Two)

[0071] The second part 22 of the connecting component 20M 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 20M 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 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 making the engaging member 44 (e.g., a nut, see...) Figure 3 The first part 21 engages with the end of the fastening member 43 passing through the second mounting hole 22h, thereby fixing the second part 22 to the busbar 42. In this embodiment, a connecting member 20M is formed in an L-shape by the first part 21 and the second part 22.

[0072] <3.1.3 Second Type of Electronic Components>

[0073] 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".

[0074] 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 member 72 (e.g., a screw or bolt), described later. 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 member 72 passes. One of terminals 13A and 13B is an example of a "first terminal". The other of terminals 13A and 13B is an example of a "second terminal".

[0075] <3.1.4 Second type of connecting component>

[0076] 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 L12 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 L11 in the long side direction of the electronic member 10N. The connecting member 20N has, for example, a first portion 21, a second portion 22, and a third portion 23.

[0077] (Part 1)

[0078] 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 erected 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 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.

[0079] (Part Two)

[0080] 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.

[0081] (Part Three)

[0082] 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.

[0083] <3.2 Connecting components for external connections>

[0084] Next, the connecting component 30 for external connection will be described.

[0085] 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.

[0086] (Part 1)

[0087] 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 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 mounting hole 31h of the first part 31, the first part 31 is physically and electrically connected to the external connection busbar 76.

[0088] (Part Two)

[0089] Part 2, 32, is related to busbar 42 (see reference). Figure 8 The 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.

[0090] (Part Three)

[0091] 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.

[0092] <3.3 Substrate for Wiring>

[0093] Next, the wiring substrate 40 will be described.

[0094] 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.

[0095] The wiring substrate 40 includes, for example, a base plate 41, one or more busbars 42, and a plurality of fastening members 43. In this embodiment, the base plate 41 and the plurality of busbars 42 are integrated by insert molding. For example, after the fastening members 43 are fixed to the busbars 42, the busbars 42 are insert-molded with the base plate 41, thereby forming the wiring substrate 40 into a sheet-like component. That is, the busbars 42 are integrated with the base plate 41 without using fastening members such as screws or bolts. Furthermore, the wiring substrate 40 may also be formed by other structures instead of insert molding. A variation of the wiring substrate 40 formed by another structure will be described later.

[0096] Figure 9 This is an exploded perspective view of a portion of the wiring substrate 40. Hereinafter, for ease of explanation, the substrate 41, busbar 42, and fastening member 43 will be described with reference to the exploded view of the wiring substrate 40.

[0097] (Substrate board)

[0098] The substrate 41 is a retaining member that integrally holds a plurality of busbars 42 arranged horizontally and spaced apart from each other. The substrate 41 is, for example, made of synthetic resin and has insulating properties. The substrate 41 provides electrical insulation between the plurality of busbars 42. The substrate 41 is an example of a "substrate component." The substrate 41 can also be referred to as an "insulating substrate." The substrate 41, for example, has a planar portion 51 and a plurality of fixing portions 52. The fixing portions 52 will be described later.

[0099] 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 part of the substrate plate 41. The planar portion 51 forms the base (insulating base) of the substrate plate 41. In this embodiment, the planar portion 51 extends throughout the entire range of the substrate plate 41 in the X direction, except for the four corners of the substrate plate 41, and extends throughout the entire range of the substrate plate 41 in the Y direction.

[0100] The planar portion 51 has a first surface 51a and a second surface 51b. 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 the plurality of electronic components 10 and faces the insulating cover 93 of the electrical connection unit 1 (see reference). Figure 1 The second surface 51b is located on the opposite side to 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 80 (see reference). Figure 1 The thickness direction (plate thickness direction) of the planar portion 51 is the Z direction.

[0101] The planar portion 51 may have one or more receiving portions 55, for example, each receiving a busbar 42. The multiple receiving portions 55 are formed separately from each other in the X or Y direction. Each receiving portion 55 is, for example, a through hole penetrating the planar portion 51 in the Z direction. It should be noted that the receiving portion 55 may also be a recess provided on the first surface 51a or the second surface 51b of the planar portion 51 and recessed in the Z direction, rather than a through hole. It should also be noted that in this disclosure, "the receiving portion penetrating 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 portion in the Z direction, or it may be a form provided inside the base plate 41 and not exposed to the outside of the base plate 41). Similarly, in this disclosure, "the receiving portion is recessed in the first direction (Z direction)" may also include a portion of the entire length of the receiving portion 55 that is recessed in the Z direction (for example, the remaining portion of the receiving portion 55 may be a through hole that penetrates the planar portion 51 in the Z direction, or it may be a form that is provided inside the base plate 41 and does not expose to the outside of the base plate 41).

[0102] Additionally, the planar portion 51 has one or more openings 121. The openings 121 are located along at least one of a portion of the busbar 42 and a portion of the outline of the electronic component 10. Furthermore, as... Figure 9 As shown, the opening 121, which is configured along a portion of the busbar 42, is also configured along a portion of the receiving section 55. The opening 121 will be described in detail later.

[0103] Viewed from the Z direction, each receiving portion 55 has a shape corresponding to the shape of the received busbar 42. In this embodiment, the planar portion 51 includes, for example, five receiving portions 55A, 55B, 55C, 55D, and 55E as a plurality of receiving portions 55. Receiving portion 55A is provided corresponding to busbar 42A (described later) and receives busbar 42A. Receiving portion 55B is provided corresponding to busbar 42B (described later) and receives busbar 42B. Receiving portion 55C is provided corresponding to busbar 42C (described later) and receives busbar 42C. Receiving portion 55D is provided corresponding to busbar 42D (described later) and receives busbar 42D. Receiving portion 55E is provided corresponding to busbar 42E (described later) and receives busbar 42E.

[0104] (Busbar)

[0105] 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. 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, for example, five busbars 42A, 42B, 42C, 42D, and 42E as a plurality of busbars 42. The five busbars 42A, 42B, 42C, 42D, and 42E are arranged horizontally with intervals between them. The five busbars 42A, 42B, 42C, 42D, and 42E include portions arranged on the same plane. The five busbars 42A, 42B, 42C, 42D, and 42E are held by the planar portion 51 of the substrate 41.

[0106] At least a portion of each busbar 42 is plate-shaped along the horizontal direction. At least a portion of each busbar 42 is housed in a housing portion 55 and extends along a planar portion 51. That is, at least a portion of each busbar 42 extends along a first surface 51a of the planar portion 51. At least a portion of each busbar 42 extends horizontally within the housing portion 55. In this embodiment, each busbar 42 is plate-shaped along the entire horizontal direction. Each busbar 42 is housed in a housing portion 55 and extends along the planar portion 51 along its entire length. Hereinafter, the portion of each busbar 42 housed in the housing portion 55 and extending along the planar portion 51 is sometimes referred to as "plate portion 42p". 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".

[0107] Figure 10 This is a top 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 on its plate portion 42p.

[0108] 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 adjacent to the first connecting member 20 in the Z direction and is connected to the first connecting member 20 from the Z direction.

[0109] 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.

[0110] 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.

[0111] The first connecting part 61 and the second connecting part 62 are examples of the "first connecting part" and also examples of the "second connecting part".

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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).

[0116] 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.

[0117] In this embodiment, at least one of the extension portion 63 and the extension portion 64 includes, for example, a straight portion 42s extending linearly in the second direction (X direction). The distance L1 between the opening 121 and the busbar 42, described later, is explained by the width 42w of the straight portion 42s in the third direction (Y direction). Furthermore, when the straight portion 42s of the busbar 42 extends in the Y direction, the distance L1 between the opening 121 and the busbar 42, described later, is explained by the width of the straight portion 42s in the second direction (X direction).

[0118] The following describes several layout examples of busbar 42. Furthermore, the plurality of electronic components 10 includes three electronic components 10A, 10B, and 10C. Electronic components 10A and 10B are, for example, first-type electronic components 10M. Electronic component 10C is, for example, second-type electronic components 10N. Moreover, the types of electronic components 10 are not limited to the examples described above. Additionally, the plurality of connecting components 20 includes six connecting components 20A, 20B, 20C, 20D, 20E, and 20F. The plurality of connecting components 30 includes two connecting components 30A and 30B. The plurality of connecting busbars 75 includes two connecting busbars 75A and 75B. The plurality of external connection busbars 76 includes two external connection busbars 76A and 76B.

[0119] (First deployment example)

[0120] First, a layout example related to busbar 42A will be described. Busbar 42A has a first connecting portion 61, a second connecting portion 62, and an extension portion 63. When viewed from the Z direction, the first connecting portion 61 is located on the +X direction side relative to the electronic component 10A. The first connecting portion 61 is electrically connected to the terminal 13A of the electronic component 10A via a connecting member 20A, which serves as a first connecting member 20. When viewed from the Z direction, the second connecting portion 62 is located on the -X direction side relative to the electronic component 10A. The second connecting portion 62 is electrically connected to other sub-units SU via connecting busbar 75A.

[0121] Since the extension 63 is housed in the housing 55, it extends through the region R that overlaps with the electronic component 10A when viewed from the Z direction and across both sides of the region R. For example, the extension 63 extends in a straight line along the X direction. The extension 63 extends through the region R that overlaps with the electronic component 10A when viewed from the Z direction and across the +X and -X direction sides of the region R. The busbar 42A is an example of a "first busbar". The housing 55A housing the busbar 42A is an example of a "first housing". The busbar 42A is, for example, the busbar included in the positive line PL of the electrical connection unit 1.

[0122] (Second deployment example)

[0123] Next, an example of the arrangement related to busbar 42B will be described. Busbar 42B has a first connecting portion 61, a second connecting portion 62, an extension portion 63, and an extension portion 64. The first connecting portion 61 is electrically connected to the terminal 13B of the electronic component 10A via a connecting member 20B, which is a first connecting member 20. The second connecting portion 62 is electrically connected to an external connection busbar 76A via a connecting member 30A, which is a second connecting member 30. When viewed from the Z direction, the extension portion 64 extends to the region R that overlaps with the electronic component 10A, and has an end portion 42e1 of busbar 42 at the position where it overlaps with the electronic component 10A. Furthermore, busbar 42B may also have an extension portion 63 similar to busbar 42A, which extends 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. Busbar 42B is another example of a "first busbar". The receiving portion 55B that receives busbar 42B is another example of a "first receiving portion". From another perspective, busbar 42B is an example of a "second busbar". Reception section 55B is another example of a "second reception section". Busbar 42B is, for example, the busbar included in the positive line PL of the electrical connection unit 1.

[0124] (Third deployment example)

[0125] Next, a layout example related to busbar 42C will be described. Busbar 42C has a first connecting portion 61, a second connecting portion 62, an extension portion 63, and an extension portion 64. The first connecting portion 61 is electrically connected to the terminal 13B of the electronic component 10B via a connecting member 20C, which serves as a first connecting member 20. The second connecting portion 62 is electrically connected to other sub-units SU via connecting busbar 75B. The extension portion 64 extends to a region R that overlaps with the electronic component 10B when viewed from the Z direction, and has an end portion 42e1 of busbar 42 at the position where it overlaps with the electronic component 10B when viewed from the Z direction. Busbar 42C is another example of a "first busbar". The receiving portion 55C that houses busbar 42C is another example of a "first receiving portion". Busbar 42C is, for example, a busbar included in the negative line NL of the electrical connection unit 1. From another perspective, busbar 42C is an example of a "third busbar". Containment Unit 55C is an example of the "Third Containment Unit".

[0126] (Fourth deployment example)

[0127] Next, a layout example related to busbar 42D will be described. Busbar 42D has a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 is electrically connected to terminal 13A of electronic component 10B via connecting member 20D, which is a first connecting member 20. The second connecting portion 62 is electrically connected to terminal 13B of electronic component 10C via connecting member 20E, which is a second connecting member 20. Busbar 42D is another example of a "first busbar". The receiving portion 55D that houses busbar 42D is another example of a "first receiving portion". Busbar 42D is, for example, a busbar included in the negative line NL of electrical connection unit 1. From another perspective, busbar 42D is another example of a "third busbar". The receiving portion 55D is another example of a "third receiving portion".

[0128] (Fifth Layout Example)

[0129] Next, a layout example related to busbar 42E will be described. Busbar 42E has a first connecting portion 61, a second connecting portion 62, and an extension portion 63. The first connecting portion 61 is electrically connected to the terminal 13A of the electronic component 10C via a connecting member 20F, which serves as a first connecting member 20. The second connecting portion 62 is electrically connected to an external connection busbar 76B via a connecting member 30B, which serves as a second connecting member 30. Busbar 42E is another example of a "first busbar". The receiving portion 55E that houses busbar 42E is another example of a "first receiving portion". Busbar 42E is, for example, a busbar included in the negative line NL of the electrical connection unit 1. From another perspective, busbar 42E is another example of a "third busbar". The receiving portion 55E is another example of a "third receiving portion".

[0130] (Fastening components)

[0131] Next, refer to again Figure 9 The fastening component 43 will now be described. The fastening component 43 is a component used to secure the busbar 42 to a connecting component (connecting component 20, connecting component 30, connecting busbar 75, or connecting component 100) of the busbar 42. The fastening component 43 is, for example, a riveting bolt fixed to the busbar 42. The fastening component 43 is an example of a "fastening part".

[0132] 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 penetrates the busbar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion 43a and a head 43b. The circumferential surface of the shaft portion 43a has a threaded groove. The diameter of the head 43b is larger than the diameter of the shaft portion 43a. With the shaft portion 43a passing through the through hole 42h of the busbar 42, the head 43b of the fastening member 43 is riveted to the busbar 42. Through this fixation, with the shaft portion 43a protruding from the through hole 42h of the busbar 42 in the +Z direction, the fastening member 43 is electrically and physically connected to the busbar 42. Furthermore, the fastening member 43 is not limited to riveting; it can also be fixed to the busbar 42 by welding or other methods.

[0133] 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 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 mounting hole 22h of the second part 22 of the connecting member 20. The engaging member 44 is mounted to the shaft portion 43a, for example, along the Z direction. Through this engagement, the second part 22 of the connecting member 20 is fixed to the fastening member 43.

[0134] <4. Metal plates, insulating sheets, heat-conducting components, and insulating covers>

[0135] Next, the metal plate 80, the insulating sheet 91, the heat-conducting component 92, and the insulating cover 93 will be described.

[0136] <4.1 Metal Plate>

[0137] Figure 11 This is a perspective view showing an exploded portion of the electrical connection unit 1. The metal plate 80 is a component used to ensure the rigidity of the electrical connection unit 1 and improve its heat dissipation. The metal plate 80 is made of metal (e.g., aluminum or aluminum alloy). The metal plate 80 may also be referred to as a "rigid component".

[0138] 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 and are 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 and are separated in the Y direction. The metal plate 80 includes, for example, a planar portion 81, a plurality of fixing portions 82, and a plurality of fixing portions 83.

[0139] 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 forms 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 has a gap S1 (see reference) between it and the second surface 51b of the planar portion 51 of each sub-unit SU. Figure 13 ), and the second surface 51b of the planar portion 51 facing each subunit SU. The gap S1 is an example of the "first gap".

[0140] The fixing part 82 is a fixing part used to fix the base plate 41 of each sub-unit SU to the metal plate 80. When viewed from the Z direction, the fixing part 82 is provided at a position corresponding to the fixing part 52 of the base plate 41 of each sub-unit SU. The fixing part 82 is a cylindrical or prismatic boss that protrudes from the flat part 81 of the metal plate 80 in the +Z direction.

[0141] The fixing part 83 is used to fix the electronic components 10 of each subunit SU directly to the metal plate 80 without passing through 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 subunit SU. The fixing part 83 is a cylindrical or prismatic boss that protrudes from the flat part 81 in the +Z direction.

[0142] <4.2 Insulating Sheets>

[0143] 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.

[0144] In this embodiment, the insulating sheet 91 is adhered to the flat portion 81 of the metal plate 80. The insulating sheet 91 has cutouts or openings to avoid the fixing portions 82 and 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.

[0145] <4.3 Thermal Conductive Components>

[0146] 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.

[0147] 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. For example, when viewed from the Z direction, the plurality of heat-conducting components 92 are arranged at a position overlapping a portion of the busbar 42. Furthermore, when viewed from the Z direction, the plurality of heat-conducting components 92 are arranged near the electronic components 10 (e.g., electronic components 10A, 10B) at a position overlapping a portion of the busbar 42. In this embodiment, when viewed from the Z direction, the plurality of heat-conducting components 92 are arranged at a position overlapping the connecting component 20.

[0148] Figure 13 It is along Figure 10 The diagram shows a cross-sectional view along line F13-F13 of the structure. In this embodiment, a heat-conducting component 92 is disposed between the metal plate 80 and the busbar 42. The heat-conducting component 92 transfers heat from the electronic component 10 to the busbar 42 and / or heat emitted by the busbar 42 from the busbar 42 to the metal plate 80.

[0149] In this embodiment, a portion of the heat-conducting component 92 contacts the busbar 42 at a location where it overlaps with the connecting component 20 when viewed from the Z direction. In this case, the heat-conducting component 92 can easily transfer heat from the terminal 13 of the electronic component 10 to the connecting component 20 via the busbar 42 from the connecting component 20 to the metal plate 80.

[0150] In this embodiment, a portion of the heat-conducting component 92 is positioned to overlap with and contact the head 43b of the fastening component 43 when viewed from the Z direction. In this case, the heat-conducting component 92 facilitates the transfer of heat from the terminal 13 of the electronic component 10 to the connecting component 20 from the fastening component 43 to the metal plate 80.

[0151] Furthermore, in this embodiment, a portion of the heat-conducting component 92 contacts the busbar 42 at a location where it overlaps with the electronic component 10 when viewed from the Z direction. In this case, the heat-conducting component 92 facilitates the transfer of heat from the electronic component 10 to the busbar 42, and then from the busbar 42 to the metal plate 80. Figure 13 In the example shown, the upper surface of the busbar 42 contacts the electronic component 10, thereby thermally connecting the busbar 42 and the electronic component 10. Furthermore, the portion of the busbar 42 that is thermally connected to the electronic component 10 can be either an extension 63 or an extension 64.

[0152] <4.4 Insulating Cover>

[0153] 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.

[0154] <5. Opening>

[0155] A more detailed description of the substrate plate 41 is provided. For example... Figure 4 As shown, the planar portion 51 of the base plate 41 has at least one opening 121. In the following description, representative openings 121 (e.g., openings 121A, 121B, 121C, 121D, 121E, 121F, 121G, 121H, 121K, 121L) will be described in detail. Furthermore, the sub-unit SUX will be used as an example, but other sub-units SUY and SUZ may also have the same opening 121. Additionally, the opening 121 provided in the electrical connection unit 1 may be only one.

[0156] The opening 121 extends through the planar portion 51 in the first direction (Z direction). For example... Figure 4 , Figure 10 and Figure 12As shown, openings 121A, 121B, 121C, 121D, 121E, 121F, 121G, 121H, 121K, and 121L are arranged along a portion of the outline of busbar 42. Additionally, opening 121H is arranged along a portion of the outline of the first electronic component 10. The distance L1 between opening 121 and busbar 42 is smaller than the width 42w of the third direction (Y direction) of the straight portion 42s included by busbar 42.

[0157] Furthermore, openings 121B, 121C, 121F, 121H, and 121L extend linearly along the aforementioned straight portion 42s in the second direction (X direction). Openings 121A, 121D, and 121G extend linearly along the width direction of the busbar 42 in the third direction (Y direction). Openings 121E and 121K extend partially along the busbar 42 in directions intersecting the second and third directions.

[0158] Furthermore, the opening 121 in this embodiment has a first opening extending along a portion of the busbar 42 and a second opening that is separated from the first opening and extends along another portion of the busbar 42. For example, if the first opening is designated as openings 121B, 121C, 121F, 121H, and 121L, then the second opening corresponds to openings 121A, 121D, 121E, 121G, and 121K. That is, two or more openings 121 are arranged along different portions of the shape of a busbar 42 and are separately provided around the busbar 42.

[0159] Here, the configuration of opening 121 will be explained. When the electrical connection unit 1 is mounted on a vehicle, various electronic components operate during vehicle operation (such as driving or charging). Due to the heat generated by the operating electronic components and the power supply busbar 42, the temperature of the electrical connection unit 1 gradually rises. The coefficient of linear expansion of the synthetic resin substrate 41 is greater than that of the metal plate 80. Therefore, during thermal expansion, the substrate 41 extends more than the metal plate 80. On the other hand, during thermal contraction, the substrate 41 contracts more significantly than the metal plate 80.

[0160] At this time, based on the coefficient of linear expansion, the deformation of the base plate 41 in a specified direction caused by temperature change is estimated. If the length of the base plate 41 between adjacent busbars 42 in the second or third direction is set as L2, then based on the coefficient of linear expansion α, the deformation of the base plate 41 between adjacent busbars 42 is as follows. The deformation of the base plate 41 between adjacent busbars 42 can also be described as the deformation of the planar portion 51 between adjacent receiving portions 55.

[0161] ΔL=αL2ΔT

[0162] ΔL: refers to the deformation of the base plate 41 between adjacent busbars 42 in a specified direction. The above deformation is the deformation in the specified direction.

[0163] ΔT: refers to the temperature change of electrical connection unit 1.

[0164] As mentioned above, for example, Figure 9 As shown, as L2 increases in the specified direction (e.g., the second or third direction), the deformation of a portion of the base plate 41 sandwiched between the two busbars 42 increases.

[0165] Furthermore, when the length of the base plate 41 between the side peripheral surface 41CS and the busbar 42 is set to L3, the deformation of the base plate 41 between the side peripheral surface 41CS and the busbar 42 increases as L3 in the specified direction (e.g., the second direction or the third direction). That is, as the busbar 42 moves away from the side peripheral surface 41CS, the deformation of the base plate 41 between the side peripheral surface 41CS and the busbar 42 increases. The side peripheral surface 41CS faces a direction intersecting the first direction (Z direction).

[0166] For example, as a comparative example, the case where the planar portion 51 does not have an opening 121 will be described. When the electrical connection unit 1 reaches a high temperature, the base plate 41 expands significantly. If the base plate 41 and the busbar 42 have the same dimensions in a predetermined direction, the deformation of the busbar 42 as the temperature of the electrical connection unit 1 rises is smaller than the deformation of the base plate 41. Therefore, a portion of the base plate 41 can locally expand at the contact point with the busbar 42. When the connection unit 1 returns to normal temperature, a space is formed between the base plate 41 and the busbar 42 due to the difference in the values ​​of the coefficients of linear expansion. Depending on the condition of this space, the busbar 42 may detach.

[0167] Therefore, the planar portion 51 of this embodiment has an opening 121 disposed along at least one of a portion of the outline of the busbar 42 and a portion of the outline of the first electronic component 10. The distance L1 between the opening 121 and the busbar 42 is smaller than the width 42w in the third direction (Y direction) of the straight portion 42s included by the busbar 42.

[0168] For example, in busbar 42, the end face of busbar 42 located on the +X direction side is designated as the first end face, and the end face of busbar 42 located on the -X direction side is designated as the second end face. Similarly, in busbar 42, the end face of busbar 42 located on the +Y direction side is designated as the third end face, and the end face of busbar 42 located on the -Y direction side is designated as the fourth end face. In this embodiment, when viewed from the center of busbar 42, the first connecting portion 61 is located on the first end face side, and when viewed from the center of busbar 42, the second connecting portion 62 is located on the second end face side.

[0169] Taking busbar 42D as an example, a first opening can be provided at a predetermined position starting from one end face of busbar 42D, and a second opening can be provided at a predetermined position starting from the other end face. The planar portion 51 has a first opening (e.g., opening 121H) within a width 42w starting from the first end face of busbar 42 (e.g., busbar 42D), and a second opening (e.g., opening 121G) within a width 42w starting from the second end face of busbar 42 (e.g., busbar 42D). Furthermore, the planar portion 51 has a third opening (e.g., opening 121C) within a width 42w starting from the third end face of busbar 42 (e.g., busbar 42B), and a fourth opening (e.g., opening 121B) within a width 42w starting from the fourth end face of busbar 42 (e.g., busbar 42B). The third opening is an example of the "first opening," and the fourth opening is an example of the "second opening."

[0170] Alternatively, the planar portion 51 may have openings 121 corresponding to the first, second, third, and fourth end faces of the busbar 42 (e.g., busbar 42D). In this case, at least four openings 121 are bridged by the planar portion 51. Furthermore, there may be two or more openings 121 corresponding to one end face. For example, the planar portion 51 may have openings 121F and 121L corresponding to the second end face of the busbar 42 (e.g., busbar 42D).

[0171] in addition, Figure 13 yes Figure 10 The structure shown is a cross-sectional view along line F13-F13.

[0172] The electrical connection unit 1 of this embodiment includes a metal plate 80, which is disposed with a gap S1 between it and the base plate 41, and faces the second surface 51b of the planar portion 51. A heat-conducting member 92 is present between the busbar 42 and the metal plate 80. In this structure, heat may accumulate in the gap S1 between the base plate 41 and the metal plate 80.

[0173] In this embodiment, the opening 121 also functions as a heat dissipation opening. The opening 121 extends through the planar portion 51 in the Z direction, communicates with the gap S1 between the planar portion 51 and the metal plate 80, and allows air to pass through. For example, when heated, the air in the gap S1 between the planar portion 51 and the metal plate 80 moves upward toward the planar portion 51 through the opening 121.

[0174] With this structure, heat is less likely to accumulate in the gap S1 between the base plate 41 and the metal plate 80. If heat is less likely to accumulate in the gap S1, the heat dissipation performance of the busbar 42 is improved. When the heat dissipation performance of the busbar 42 is improved, the heat dissipation performance of the electrical connection unit 1 can also be improved.

[0175] like Figure 10 as well as Figure 12 As shown, when viewed from the first direction, at least a portion of the opening 121 is positioned to overlap with the first electronic component 10. For example, the opening 121H conforms to the above description.

[0176] Figure 14 It is along Figure 10 The diagram shows a cross-sectional view along line F14-F14 of the structure. Opening 121H is described in detail. When the electronic component 10 is fixed across the two connecting members 20, the two busbars 42 (e.g., busbars 42D, 42E) receive heat from the electronic component 10 via the two connecting members 20. At this time, the thermal expansion of the base plate 41 between the two connecting members 20 becomes extremely large, and the electronic component 10 is repeatedly subjected to loads during repeated thermal expansion and contraction. In the case where the electronic component 10 is a fuse, the load sometimes acts on the fusible portion inside the fuse, shortening the lifespan of the electronic component 10.

[0177] Therefore, in this embodiment, when viewed from the first direction (Z direction), at least a portion of the opening 121 is positioned to overlap with the first electronic component 10.

[0178] <14. Advantages>

[0179] As a comparative example, consider an electrical connection unit in which the busbar is positioned upright relative to the lower wall of the housing. In such a comparative example, since the cross-sectional area of ​​the busbar is determined, for example, to realize its function as a wiring material, it is sometimes difficult to reduce the width (height) of the upright busbar. In this case, the width of the upright busbar becomes a bottleneck, and the thinning of the electrical connection unit may become difficult.

[0180] On the other hand, in this embodiment, the electrical connection unit 1 includes a first electronic component 10 and a wiring substrate 40. The wiring substrate 40 includes a base component 41 and a first busbar 42. The base component 41 has a plate-like or sheet-like planar portion 51, which has a first surface 51a facing the first electronic component 10. The planar portion 51 has a first receiving portion 55 that is recessed in the Z direction or extends through the planar portion 51 in the Z direction. At least a portion of the first busbar 42 is received in the first receiving portion 55 and extends along the planar portion 51. According to this structure, at least a portion of the wiring path is formed on a plane, and compared with the structure of the comparative example described above, the width of the busbar is less likely to become a bottleneck, making it easier to achieve a thinner electrical connection unit 1.

[0181] Furthermore, in this embodiment, the difference in the coefficients of linear expansion between the base plate 41 and the metal plate 80 is also considered. For example, as a comparative example, the case where the planar portion 51 does not have an opening 121 will be described. When the electrical connection unit 1 reaches a high temperature, the base plate 41 expands significantly. If the base plate 41 and the busbar 42 have the same dimensions in a predetermined direction, the deformation of the busbar 42 as the temperature of the electrical connection unit 1 rises is smaller than the deformation of the base plate 41. Therefore, a portion of the base plate 41 can locally expand at the contact point with the busbar 42. When the connection unit 1 returns to normal temperature, a space is formed between the base plate 41 and the busbar 42 due to the difference in the values ​​of the coefficients of linear expansion. Depending on the extent of this space, the busbar 42 may detach.

[0182] In this embodiment, the planar portion 51 has an opening 121 disposed along at least one of a portion of the outline of the busbar 42 and a portion of the outline of the first electronic component 10. Thus, the opening 121 absorbs the expansion of the substrate 41, making it less likely for local expansion of the substrate 41 to occur around the busbar 42. Furthermore, if the distance L1 between the opening 121 and the busbar 42 is smaller than the width 42w in the third direction (Y direction) of the straight portion 42s included in the busbar 42, the aforementioned local expansion is even less likely to occur around the busbar 42.

[0183] Furthermore, in this embodiment, at least a portion of the busbar 42 remains on the planar portion 51. By making the aforementioned local expansion less likely to occur around the busbar 42, the busbar 42 is more easily held on the planar portion 51.

[0184] In this embodiment, openings 121B, 121C, 121F, 121H, and 121L extend linearly along the aforementioned straight portion 42s in the second direction (X direction). With this structure, thermal expansion of the base plate 41 that may occur in the second direction (X direction) where the busbar 42 extends can be suppressed.

[0185] In this embodiment, the opening 121 has a first opening extending along a portion of the busbar 42 and a second opening that is separate from the first opening and extends along another portion of the busbar 42. With this structure, the aforementioned local expansion is less likely to occur in the first and second openings. By having two openings 121 that follow the outline of the busbar 42, a portion of the busbar 42 is easily held within the planar portion 51.

[0186] In this embodiment, when viewed from the first direction (Z direction), at least a portion of the opening 121 is positioned to overlap with the first electronic component 10. With this structure, thermal expansion of the substrate 41 is suppressed around the position overlapping with the first electronic component 10. If thermal expansion of the substrate 41 is suppressed, then when the electronic component 10 is a fuse, large loads are less likely to act on the fuse's internal fusible portion, thus extending the lifespan of the electronic component 10.

[0187] In this embodiment, the planar portion 51 has a first opening and a second opening. The first opening extends over a width 42w from the first end face (third end face) of the first busbar, and the second opening extends over a width 42w from the second end face (fourth end face) of the first busbar. With this structure, the two end faces (first and second end faces) of the busbar 42 in a predetermined direction (e.g., a second or third direction) are less prone to the aforementioned localized expansion. Since the two end faces at both ends of the busbar 42 face each other, the two openings 121 also face each other, thus easily maintaining the two ends of the busbar 42 within the planar portion 51.

[0188] In this embodiment, a second busbar including a second connecting portion (first connecting portion 61 or second connecting portion 62) is also provided. The first busbar has a first connecting portion (first connecting portion 61 or second connecting portion 62) for electrical connection with the first electronic component 10, the first external device, or other busbars, and the planar portion 51 has an opening 121 (opening 121B, 121H, 121L) between the first connecting portion 61 and the second connecting portion 62. With this structure, thermal expansion of the substrate 41 is suppressed around the location where the opening 121 is provided.

[0189] <15. Variations>

[0190] Next, several variations will be described. Furthermore, in each variation, the structure except as described below is the same as that of the first embodiment.

[0191] (First variation)

[0192] The wiring substrate 40 is not limited to a structure in which the base plate 41 and the busbar 42 are integrally formed by insert molding. For example, the busbar 42 may be disposed in the receiving portion 55 after the base plate 41, which is provided with a receiving portion 55 for receiving the busbar 42, has been formed. In this case, the busbar 42 may be fixed to the receiving portion 55 by fitting, or by adhesive or other fixing methods. In these cases, potting may also be performed to fill the gap between the busbar 42 and the receiving portion 55.

[0193] (Second variation)

[0194] 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 sheet-shaped planar portion 51 (e.g., an insulating sheet). 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-shaped" or "sheet" is not limited to a component with a thickness of 1 mm or more, and may also be a component with a thickness of less than 1 mm (a so-called film).

[0195] The connection between the electronic component 10 and the busbar 42 is not limited to the connection via the connecting member 20. The electronic component 10 may also be directly connected to the busbar 42 using fastening members (e.g., bolts, screws) or welding. For example, it is possible to make the terminal 13 of the electronic component 10 directly contact the busbar 42 by welding or the like.

[0196] 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.

[0197] [Potential for Industrial Applications]

[0198] According to the present invention, the electrical connection unit can be made thinner.

[0199] Explanation of reference numerals in the attached figures

[0200] 1…Electrical connection unit

[0201] SU… subunit

[0202] 10… Electronic components

[0203] 13, 13A, 13B…terminals

[0204] 20…Connecting parts

[0205] 21…Part 1

[0206] 21h…First mounting hole

[0207] 22…Part Two

[0208] 22h…Second mounting hole

[0209] 30…Connecting parts

[0210] 31…Part One

[0211] 32…Part Two

[0212] 40… Wiring substrate

[0213] 41…Base board

[0214] 41CS…Side circumferential surface

[0215] 42…Busbar

[0216] 42e1…End of busbar

[0217] 42p…board section

[0218] 42s…straight section

[0219] 42u…exposed area

[0220] 42ua…Part 1

[0221] 42ub…Part Two

[0222] 42w…width

[0223] 43… Fastening components (fastening parts)

[0224] 51…Planar portion (insulating base)

[0225] 51a…First page, third page

[0226] 51b…Second page, Fourth page

[0227] 52…Fixed part

[0228] 52a…Part 1, Part 3

[0229] 52b…Part Two, Part Four

[0230] 55…Containment Department

[0231] 56…Kahebu

[0232] 56a…concave

[0233] 61…First connecting part

[0234] 62…Second connecting part

[0235] 63… Extension

[0236] 64…Extension

[0237] 71…Fastening components

[0238] 72… Fastening components

[0239] 73… Fastening components

[0240] 80… metal sheet

[0241] 81…Flat section (metal base)

[0242] 82…Fixed part

[0243] 83…Fixed part

[0244] 92… Thermal conductive components

[0245] 92a…First heat conduction section

[0246] 92b…Second heat-conducting section

[0247] 100…Connecting parts

[0248] 111…Fastening components

[0249] 112… Fastening components

[0250] 121…opening

[0251] 131, 132… Maintaining Department

[0252] 141… Support section

[0253] L1… Distance between opening 121 and busbar 42

[0254] L2…the length of the base plate 41 between adjacent busbars 42 in the specified direction.

[0255] L3…Length of the base plate 41 between the side peripheral surface 41CS and the busbar 42.

Claims

1. An electrical connection unit, characterized in that, have: First electronic component; An insulating base component comprising a plate-shaped or sheet-shaped planar portion, wherein, with the thickness direction of the planar portion as a first direction, the planar portion includes a receiving portion recessed in the first direction or extending through the planar portion in the first direction; as well as A first busbar, at least a portion of which is housed within the housing portion and extends along the planar portion, and is electrically connected to the first electronic component. The planar portion has an opening that extends through the planar portion in the first direction and is disposed along at least one of a portion of the outline of the first busbar and a portion of the outline of the first electronic component.

2. The electrical connection unit as claimed in claim 1, characterized in that, When the direction intersecting the first direction is taken as the second direction, and the direction intersecting both the first and second directions is taken as the third direction, The first busbar includes a straight portion along the second direction, and The distance between the opening and the first busbar is smaller than the third-direction width of the straight section.

3. The electrical connection unit as described in claim 2, characterized in that, The opening extends linearly along the straight portion in the second direction.

4. The electrical connection unit as described in claim 1 or 2, characterized in that, The opening has: a first opening that extends along a portion of the first busbar; And a second opening, which is disposed away from the first opening and extends along another portion of the first busbar.

5. The electrical connection unit as described in claim 1 or 2, characterized in that, At least a portion of the opening is positioned to overlap with the first electronic component when viewed from the first direction.

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