Electrical connection unit

Abstract

To provide an electrical connection unit that can reduce its height.SOLUTION: An electrical connection unit of an embodiment has a first electronic component and a substrate for routing. The first electronic component has a first terminal. The substrate for routing includes a base member and a first bus bar. The base member has a plate-like or sheet-like plane part having a first surface facing the first electronic component. The first bus bar is held on the plane part and electrically connected to the first terminal of the first electronic component. When a thickness direction of the plane part is defined as a first direction, the plane part has a first storage part that is recessed in the first direction or penetrates the plane part in the first direction. At least part of the first bus bar is stored in the first storage part and extends along the plane part.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION An embodiment of the present invention relates to an electrical connection unit. [Background technology]

[0002] 2. Description of the Related Art An electrical connection unit is known that has a housing that houses electronic components and a bus bar attached to the housing in an upright position. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2024-037492 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, electrical connection units are expected to become even thinner.

[0005] One embodiment provides an electrical connection unit that can be made low-profile. [Means for solving the problem]

[0006] In one embodiment, the electrical connection unit includes a first electronic component and a wiring board. The first electronic component has a first terminal. The wiring board includes a base member and a first bus bar. The base member has a plate-like or sheet-like planar portion with a first surface facing the first electronic component. The first bus bar is held by the planar portion and electrically connected to the first terminal of the first electronic component. When the thickness direction of the planar portion is defined as a first direction, the planar portion has a first accommodating portion that is recessed in the first direction or that penetrates the planar portion in the first direction. At least a portion of the first bus bar is accommodated in the first accommodating portion and extends along the planar portion. [Effects of the Invention]

[0007] According to one embodiment, the electrical connection unit can be made low-profile. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view showing the electrical connection unit of the first embodiment. [Figure 2] FIG. 2 is a perspective view illustrating a main body of the first embodiment. [Figure 3] FIG. 2 is a perspective view illustrating a subunit according to the first embodiment. [Figure 4] FIG. 2 is a partially exploded perspective view of the subunit of the first embodiment. [Figure 5] FIG. 2 is a perspective view illustrating an electronic component and a connecting component according to the first embodiment. [Figure 6] FIG. 2 is a perspective view illustrating an electronic component and a connecting component according to the first embodiment. [Figure 7] FIG. 2 is a perspective view showing a connecting part according to the first embodiment. [Figure 8] FIG. 2 is a perspective view showing the wiring board of the first embodiment. [Figure 9] FIG. 2 is a partially exploded perspective view of the wiring board according to the first embodiment. [Figure 10] FIG. 2 is a plan view showing the wiring board of the first embodiment. [Figure 11] FIG. 2 is a partially exploded perspective view of the connection unit according to the first embodiment. [Figure 12] FIG. 2 is a bottom view showing the wiring board of the first embodiment. [Figure 13] 11 is a cross-sectional view of the structure shown in FIG. 10 taken along line F13-F13. [Figure 14] FIG. 4 is a cross-sectional view showing a modification of the first embodiment. [Figure 15] FIG. 4 is a cross-sectional view showing a modification of the first embodiment. [Figure 16] FIG. 4 is a cross-sectional view showing a modification of the first embodiment. [Figure 17] FIG. 4 is a cross-sectional view showing a modification of the first embodiment. [Figure 18] 1 is a perspective view showing a three-dimensional bus bar wiring structure according to a first embodiment; [Figure 19] FIG. 2 is a plan view showing the three-dimensional busbar wiring structure of the first embodiment. [Figure 20] 11 is a cross-sectional view of the structure shown in FIG. 10 taken along line F20-F20. [Figure 21] FIG. 4 is a cross-sectional view illustrating a heat dissipation path related to the fixing portion of the first embodiment. [Figure 22] FIG. 10 is a cross-sectional view illustrating a heat dissipation path in a modified example of the first embodiment. [Figure 23] FIG. 4 is a cross-sectional view illustrating a structure for absorbing thermal expansion / contraction related to the fixing portion of the first embodiment. [Figure 24] 5A and 5B are cross-sectional views showing the operation of the absorbent structure of the first embodiment. [Figure 25] FIG. 2 is a perspective view illustrating a first mode of an insulating rib according to the first embodiment. [Figure 26] FIG. 10 is a perspective view for explaining a first modified example of the first aspect of the first embodiment. [Figure 27] FIG. 10 is a cross-sectional view illustrating a second modified example of the first aspect of the first embodiment. [Figure 28] FIG. 4 is a perspective view illustrating a second mode of the insulating rib of the first embodiment. [Figure 29] FIG. 2 is a cross-sectional view illustrating the structure of the connecting part according to the first embodiment. [Figure 30] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the first embodiment. [Figure 31] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the first embodiment. [Figure 32] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the first embodiment. [Figure 33] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the first embodiment. [Figure 34] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the first embodiment. [Figure 35] FIG. 10 is a perspective view illustrating a subunit according to a second embodiment. [Figure 36] 36 is a cross-sectional view of the structure shown in FIG. 35 taken along line F36-F36. [Figure 37] FIG. 10 is a perspective view illustrating a subunit according to a third embodiment. [Figure 38] FIG. 10 is a perspective view illustrating a subunit according to a fourth embodiment. [Figure 39] A cross-sectional view of the structure shown in Figure 38 taken along line F39-F39. [Figure 40] FIG. 10 is a cross-sectional view showing a modification of the fourth embodiment. [Figure 41] FIG. 13 is a perspective view illustrating a subunit according to a fifth embodiment. [Figure 42] 42 is a cross-sectional view of the structure shown in FIG. 41 taken along line F42-F42. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. In the following description, components having the same or similar functions will be assigned the same reference numerals. Duplicate descriptions of those components may be omitted. Note that the configurations described below do not limit the scope of the embodiments.

[0010] In this disclosure, terms are defined as follows: "Connection" is not limited to mechanical connection and may include electrical connection. In other words, "connection" is not limited to direct connection between two elements to be connected, but may include connection between two elements via another element interposed therebetween. "Containment" is not limited to containment of the entire component, but may include containment of only a portion of the component (with the remaining portion of the component protruding). "Facing" means that virtual projections of two objects overlap when viewed from a specific direction. In other words, "facing" is not limited to two objects directly facing each other, but may include cases where two objects face each other with another component interposed between them. "Parallel," "orthogonal," or "same" may include "approximately parallel," "approximately perpendicular," or "approximately the same," respectively.

[0011] In the present disclosure, the +X direction, the −X direction, the +Y direction, the −Y direction, the +Z direction, and the −Z direction are defined as follows: The +X direction is the direction from the first end 80e1 to the second end 80e2 of the metal plate 80 (described later) (see FIG. 11). The −X direction is the direction opposite to the +X direction. Hereinafter, when there is no need to distinguish between the +X direction and the −X direction, they will simply be referred to as the “X direction.” The +Y direction and the −Y direction are directions that intersect (e.g., are perpendicular to) the X direction. The +Y direction is the direction from the third end 80e3 to the fourth end 80e4 of the metal plate 80 (described later) (see FIG. 11). The −Y direction is the direction opposite to the +Y direction. Hereinafter, when there is no need to distinguish between the +Y direction and the −Y direction, they will simply be referred to as the “Y direction.” The +Z direction and the −Z direction are directions that intersect (e.g., are perpendicular to) the X direction and the Y direction. The +Z direction is the direction from the metal plate 80 described later toward the main body portion MU (see FIG. 1). The -Z direction is the direction opposite to the +Z direction. Hereinafter, when there is no need to distinguish between the +Z direction and the -Z direction, they will simply be 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." Note that the "second direction" is not limited to the X direction, but may be the Y direction or another direction.

[0012] In the following, when there is no distinction between the X direction and the Y direction, they may be referred to as the "horizontal direction." In the following, the Z direction may be referred to as the "vertical direction." In addition, in the following, the +Z direction side may be referred to as "up" and the -Z direction side may be referred to as "down." However, these expressions are used for the convenience of explanation and do not limit the direction of gravity of the electrical connection unit 1 (the installation posture of the electrical connection unit 1).

[0013] (First embodiment) <1. Configuration of the electrical connection unit> FIG. 1 is a cross-sectional view showing an electrical connection unit 1 of a first embodiment. The electrical connection unit 1 is an in-vehicle device mounted on a vehicle such as an EV (Electric Vehicle), HEV (Hybrid Electric Vehicle), or PHEV (Plug-in Hybrid Electric Vehicle). The electrical connection unit 1 may also be referred to as an "electrical connection box" or a "junction box," for example. However, the electrical connection unit 1 is not limited to a box-shaped device.

[0014] The electrical connection unit 1 includes, for example, a main body MU, a metal plate 80, an insulating sheet 91 (see FIG. 11), a plurality of heat transfer members 92, and an insulating cover 93.

[0015] <2. Main body> First, the main body MU will be described. FIG. 2 is a perspective view illustrating the main body unit MU. The main body unit MU is a part that performs the main function of the electrical connection unit 1 (for example, switching the electrical connection state or overcurrent protection). In this embodiment, the main body unit MU is divided into multiple subunits SU. The main body unit MU is formed by connecting multiple subunits SU. In this embodiment, the main body unit MU has three subunits SU (subunits SUX, SUY, SUZ). Each subunit SU may be referred to as a "circuit assembly."

[0016] The subunit SUX has a first electrical function. The subunit SUX includes, for example, a plurality of electronic components 10X and a first wiring board 40X. The plurality of electronic components 10X are electrically connected to the first wiring board 40X.

[0017] The subunit SUY has a second electrical function. The second function is different from the first function. The subunit SUY includes, for example, a plurality of electronic components 10Y and a second wiring board 40Y. The plurality of electronic components 10Y are electrically connected to the second wiring board 40Y.

[0018] The subunit SUZ has a third electrical function. The third function is different from the first and second functions. The subunit SUZ includes, for example, a plurality of electronic components 10Z and a third wiring board 40Z. The plurality of electronic components 10Z are electrically connected to the third wiring board 40Z.

[0019] In this embodiment, the three subunits SUX, SUY, and SUZ are arranged side by side in the X direction. For example, the subunit SUX is arranged on the +X direction side of the subunit SUY. The subunits SUX and SUY are electrically connected via a plurality of coupling bus bars 75 that extend between the first routing board 40X and the second routing board 40Y. On the other hand, the subunit SUZ is arranged on the -X direction side of the subunit SUY. The subunits SUZ and SUY are electrically connected via a plurality of coupling bus bars 75 (only one is shown in FIG. 2 ) that extend between the third routing board 40Z and the second routing board 40Y. The coupling bus bar 75 is arranged on the opposite side of the metal plate 80 from the plurality of subunits SU.

[0020] In this embodiment, the three wiring boards 40X, 40Y, and 40Z included in the three subunits SUX, SUY, and SUZ are arranged on the same plane. In other words, the three wiring boards 40X, 40Y, and 40Z are arranged at the same height in the Z direction. As a result, the three wiring boards 40X, 40Y, and 40Z form one large wiring board 40M.

[0021] 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, when there is no need to distinguish between subunits SUX, SUY, and SUZ, they will simply be referred to as "subunits SU." Furthermore, when there is no need to distinguish between electronic component 10X, electronic component 10Y, and electronic component 10Z, they will simply be referred to as "electronic component 10." Furthermore, when there is no need to distinguish between first routing board 40X, second routing board 40Y, and third routing board 40Z, they will simply be referred to as "routing board 40." One subunit SU included in the three subunits SUX, SUY, and SUZ is an example of a "first subunit." Meanwhile, another subunit SU included in the three subunits SUX, SUY, and SUZ is an example of a "second subunit."

[0022] Note that, instead of the above example, the main body MU does not have to be divided into multiple subunits SU. That is, the main body MU may be formed by multiple electronic components 10 and one wiring board 40. Furthermore, the two or more subunits SU are not limited to subunits SU having different functions, and may be subunits SU having the same function.

[0023] <3. Subunit structure> Next, the configuration of the subunit SU will be described. Fig. 3 is a perspective view illustrating the subunit SU. Fig. 4 is a perspective view showing the subunit SU partially exploded. The subunit SU includes, for example, a plurality of electronic components 10, a plurality of connection components 20 for component connection, a plurality of connection components 30 for external connection, and a wiring board 40. The connection components 20 and 30 are members that form a vertical current path. The connection components 20 and 30 may also be referred to as "vertical wiring members."

[0024] <3.1 Electronic components and connecting parts> First, the electronic component 10 and the connecting component 20 for connecting the components will be described. The electronic component 10 is an electronic component that is installed in the subunit SU according to the functions required. The electronic component 10 is, for example, a connector, a fuse, a relay (e.g., a mechanical relay or a semiconductor relay), a capacitor, a branching component, various sensors (e.g., a current sensor or a voltage sensor), an electronic control unit, or an electronic component unit that combines two or more of these. Note that the type of electronic component 10 is not limited to the above example. The electronic component 10 is, for example, a heat-generating component that generates heat when power is applied. Below, a first type electronic component 10M and a second type electronic component 10N will be described as examples of the electronic component 10.

[0025] The connection component 20 is a component that electrically connects the electronic component 10 and the wiring board 40. The connection component 20 forms part of the current path in the subunit SU. The connection component 20 is made of metal (for example, copper or a copper alloy). The connection component 20 may also be referred to as a "metal component." Below, a first type connection component 20M and a second type connection component 20N will be described as examples of the connection component 20.

[0026] <3.1.1 Type 1 Electronic Components> 5 is a perspective view showing a first type electronic component 10M and a first type connecting component 20M. The first type electronic component 10M is an electronic component having a plurality of terminals 13 arranged side by side at one end of the electronic component 10M. The electronic component 10M has, for example, a case 11, a component main body 12, a plurality of terminals 13, and a plurality of mounting portions 14.

[0027] (case) Case 11 is an outer shell member that forms most of the outer shape of electronic component 10M. Case 11 is made of, for example, synthetic resin and has insulating properties. Case 11 houses component main body 12. Note that case 11 and component main body 12 may be formed integrally.

[0028] In this embodiment, the case 11 has an insulating rib 11a that protrudes in a horizontal direction (e.g., the X direction) and extends in the Z direction. The insulating rib 11a is, for example, plate-shaped and extends along the horizontal direction (e.g., the X direction) and the Z direction. The insulating rib 11a extends, for example, over the entire length of the case 11 in the Z direction. The insulating rib 11a is disposed between a plurality of terminals 13 (terminals 13A and 13B described below). The insulating rib 11a electrically insulates the terminals 13A from the terminals 13B. In this embodiment, a portion of the insulating rib 11a is disposed between first portions 21 (described below) of two connection parts 20M connected to the electronic component 10M. The insulating rib 11a electrically insulates the first portions 21 of the two connection parts 20M connected to the electronic component 10M.

[0029] (Component body) The component body 12 is a part that performs the main function of the electronic component 10M. For example, if the electronic component 10M is a relay, the component body 12 includes a switching part (e.g., a contact part) that switches between a conductive state and a non-conductive state. For example, if the electronic component 10M is a fuse, the component body 12 includes a fusing part that melts when an overcurrent flows. For example, if the electronic component 10M is a capacitor, the component body 12 includes a part that stores electric charge.

[0030] (Terminal) Terminal 13 is an electrical connection portion exposed to the outside of case 11. Terminal 13 is electrically connected to component main body 12 inside case 11. In this embodiment, electronic component 10M includes terminal 13A and terminal 13B as the multiple terminals 13. One of terminal 13A and terminal 13B is a positive terminal. The other of terminal 13A and terminal 13B is a negative terminal. One of terminal 13A and terminal 13B is an example of a "first terminal." The other of terminal 13A and terminal 13B is an example of a "second terminal."

[0031] In this embodiment, terminals 13A and 13B are provided at one end of 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 to which a fastening member 71 (e.g., a screw or a bolt) described later is attached. Mounting hole 13h opens in the horizontal direction (e.g., the X direction). The inner circumferential surface of mounting hole 13h of electronic component 10M has a threaded groove.

[0032] (Mounting part) Mounting portion 14 is a portion for fixing electronic component 10M. Mounting portion 14 has mounting holes 14h to which fastening members 112 (e.g., screws or bolts, see FIG. 11) described later are attached. Mounting holes 14h are open in the Z direction. Mounting holes 14h are insertion holes through which fastening members 112 are passed. The destination to which mounting portion 14 is fixed will be described later.

[0033] <3.1.2 Type 1 connection parts> The first-type connecting part 20M is a part that electrically connects the first-type electronic component 10M and the wiring board 40. In this embodiment, the connecting part 20M electrically connects the electronic component 10M and a bus bar 42 (see FIG. 8) included in the wiring board 40. In this embodiment, the width L12 of the connecting part 20M in the longitudinal direction (e.g., X direction) of the electronic component 10M is smaller than the width L11 of the electronic component 10M in the longitudinal direction. The connecting part 20M has, for example, a first portion 21 and a second portion 22.

[0034] (Part 1) The first portion 21 of the connecting part 20M is a portion that is connected to the terminal 13 of the electronic component 10M. The first portion 21 is a plate-like or rectangular parallelepiped portion that extends in the Z direction. The first portion 21 extends in the Z direction along one end (e.g., an end in the X direction) of the electronic component 10M. The first portion 21 is an upright portion that stands in the Z direction relative to the wiring board 40 (e.g., relative to a bus bar 42 described below). 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 is connected to the terminal 13 of the electronic component 10M from the horizontal direction (e.g., the X direction).

[0035] The first portion 21 of the connecting part 20M has a first mounting hole 21h through which a fastening member 71 (e.g., a screw or a bolt) is passed. The first mounting hole 21h is open in the horizontal direction (e.g., the X direction). The first portion 21 also has a recess 25 around the first mounting hole 21h. The recess 25 is a receiving portion that receives the head of the fastening member 71 inserted into the first mounting hole 21h. The fastening member 71 passed through the first mounting hole 21h engages with the mounting hole 13h of the terminal 13 of the electronic component 10M, thereby physically and electrically connecting the first portion 21 to the terminal 13 of the electronic component 10M. Note that the first portion 21 does not necessarily have to have the recess 25.

[0036] (Second part) The second portion 22 of the connection part 20M is a portion that is connected to the bus bar 42 (see FIG. 8). The second portion 22 protrudes horizontally (e.g., in the X direction) from the end of the first portion 21 on the −Z direction side. The second portion 22 is a plate portion that extends horizontally. The second portion 22 is adjacent to the bus bar 42 in the Z direction and is connected to the bus bar 42 from the Z direction. The second portion 22 of the connection part 20M is attached from the Z direction to a fastening member 43 (e.g., a screw or bolt, see FIG. 8) that protrudes from the bus bar 42 in the +Z direction, and is physically and electrically connected to the bus bar 42. In this embodiment, the second portion 22 of the connection part 20M has a second mounting hole 22h through which the fastening member 43 is passed. The second mounting hole 22h is open in the Z direction. The fastening member 43 is passed through the second mounting hole 22h of the second portion 22. Then, an engaging member 44 (e.g., a nut, see FIG. 3) engages with the tip of a fastening member 43 passed through the second mounting hole 22h, thereby fixing the second portion 22 to the bus bar 42. In this embodiment, the first portion 21 and the second portion 22 form an L-shaped, single-piece connecting part 20M.

[0037] <3.1.3 Second type electronic components> FIG. 6 is a perspective view showing a second-type electronic component 10N and a second-type connecting component 20N. The second-type electronic component 10N is an electronic component in which two terminals 13 are arranged separately at both horizontal ends of the electronic component 10N. The electronic component 10N includes, for example, a case 11, a component main body 12, and a plurality of terminals 13. Note that, among the components of the electronic component 10N, components having the same function as the electronic component 10M are denoted by the same reference numerals. In this case, in the description of the electronic component 10N, "electronic component 10M" can be read as "electronic component 10N" in the description of the electronic component 10M described above.

[0038] In electronic component 10N, terminals 13A and 13B are arranged separately at both ends of electronic component 10N in the horizontal direction (e.g., the X direction). Each terminal 13 has a mounting hole 13h to which a fastening member 72 (e.g., a screw or a bolt) described below is attached. Mounting hole 13h opens in the Z direction. For example, mounting hole 13h of electronic component 10N is an insertion hole through which fastening member 72 is passed. One of terminal 13A and terminal 13B is an example of a "first terminal." The other of terminal 13A and terminal 13B is an example of a "second terminal."

[0039] <3.1.4 Second type of connecting parts> The second-type connecting part 20N is a part that electrically connects the second-type electronic component 10N and the wiring board 40. In this embodiment, the connecting part 20N electrically connects the electronic component 10N and a bus bar 42 (see FIG. 8) included in the wiring board 40. In this embodiment, the width L12 of the connecting part 20N in the longitudinal direction (e.g., X direction) of the electronic component 10N is smaller than the width L11 of the electronic component 10N in the longitudinal direction. The connecting part 20N has, for example, a first portion 21, a second portion 22, and a third portion 23.

[0040] (Part 1) The first portion 21 of the connection part 20N is a portion connected to the terminal 13 of the electronic component 10N. The first portion 21 is a rectangular parallelepiped portion extending in the Z direction. The first portion 21 is an upright portion that stands in the Z direction relative to the routing board 40 (e.g., relative to the bus bar 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 connection part 20N has a first mounting hole 21h with which a fastening member 72 engages. The first mounting hole 21h opens in the Z direction. The inner circumferential surface of the first mounting hole 21h of the connection part 20N has a thread groove. The first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10N by engaging the fastening member 72 passed through the mounting hole 13h of the terminal 13 of the electronic component 10N with the mounting hole 21h of the first part 21.

[0041] (Second part) The second portion 22 of the connection part 20N is a portion that is connected to the bus bar 42 (see FIG. 8). The second portion 22 protrudes horizontally (e.g., in the X direction) from the end of the first portion 21 on the −Z direction side. The second portion 22 is a plate portion that extends horizontally. The second portion 22 is adjacent to the bus bar 42 in the Z direction and is connected to the bus bar 42 from the Z direction. The second portion 22 of the connection part 20N is attached from the Z direction to a fastening member 43 (e.g., a screw or bolt, see FIG. 8) that protrudes from the bus bar 42 in the +Z direction, and is physically and electrically connected to the bus bar 42. In this embodiment, the second portion 22 of the connection part 20N has a second mounting hole 22h through which the fastening member 43 is passed. The second mounting hole 22h is open in the Z direction. The fastening member 43, which will be described later, is passed through the second mounting hole 22h of the second portion 22. Then, second portion 22 is fixed to bus bar 42 by engaging an engaging member 44 (for example, a nut, see FIG. 3) with the tip of fastening member 43 passed through second mounting hole 22h.

[0042] (3rd part) The third portion 23 is an upright wall (side wall) that stands in the +Z direction from both horizontal end portions of the second portion 22. The third portion 23 is a wall that extends along the Z direction. The third portion 23 is connected to the first portion 21 and also to the second portion 22. The third portion 23 extends at an incline that increases in the X direction as it progresses in the -Z direction, for example. The third portion 23 may be provided in the connection part 20M described above. On the other hand, the connection part 20N may not have the third portion 23.

[0043] <3.2 External connection parts> Next, the connecting part 30 for external connection will be described. FIG. 7 is a perspective view showing a connection part 30 for external connection. The connection part 30 is a part that electrically connects an external connection bus bar 76 and a wiring board 40. In this embodiment, the connection part 30 electrically connects the external connection bus bar 76 and a bus bar 42 (see FIG. 8) included in the wiring board 40. The external connection bus bar 76 is electrically connected to an external device. In this disclosure, the term "external device" refers to an electrical device that exists outside the electrical connection unit 1. Examples of external devices include, but are not limited to, a battery unit mounted on a vehicle or an inverter for driving a vehicle motor. The connection part 30 has, for example, a first portion 31, a second portion 32, and a third portion 33.

[0044] (Part 1) The first portion 31 is a portion connected to the external connection busbar 76. The first portion 31 is a rectangular parallelepiped portion extending in the Z direction. The first portion 31 is an upright portion that stands in the Z direction relative to the wiring board 40 (e.g., relative to the busbar 42). The first portion 31 is adjacent to the external connection busbar 76 in the Z direction and is connected to the external connection busbar 76 from the Z direction. The first portion 31 has a first mounting hole 31h through which a fastening member 73 (e.g., a screw or a bolt) is passed. The first mounting hole 31h opens in the Z direction. The inner circumferential surface of the first mounting hole 31h has a thread groove. The first portion 31 is physically and electrically connected to the external connection busbar 76 by the fastening member 73 passed through the mounting hole 76h of the external connection busbar 76 engaging with the mounting hole 31h of the first portion 31.

[0045] (Second part) The second portion 32 is a portion that is connected to the bus bar 42 (see FIG. 8). The second portion 32 protrudes horizontally (e.g., in the X direction) from the end of the first portion 31 on the −Z direction side. The second portion 32 is a plate portion that extends horizontally. The second portion 32 is adjacent to the bus bar 42 in the Z direction and is connected to the bus bar 42 from the Z direction. The second portion 32 is attached from the Z direction to a fastening member 43 (e.g., a screw or bolt, see FIG. 8) that protrudes from the bus bar 42 in the +Z direction, and is physically and electrically connected to the bus bar 42. In this embodiment, the second portion 32 has a second mounting hole 32h through which the fastening member 43 is passed. The second mounting hole 32h is open in the Z direction. The fastening member 43, which will be described later, is passed through the second mounting hole 32h of the second portion 32. Then, second portion 32 is fixed to bus bar 42 by engaging an engaging member 44 (for example, a nut, see FIG. 3) with the tip of fastening member 43 passed through second mounting hole 32h.

[0046] (3rd part) The third portion 33 is an upright wall (side wall) that stands at +Z angle from both horizontal ends of the second portion 32. The third portion 33 is a wall that extends along the Z direction. The third portion 33 is connected to the first portion 31 and also to the second portion 32. The third portion 33 extends at an incline that increases in the X direction (or Y direction) as it progresses in the -Z direction. Note that the connection part 30 does not necessarily have the third portion 33.

[0047] <3.3 Wiring board> Next, the wiring board 40 will be described. FIG. 8 is a perspective view of a wiring board 40. The wiring board 40 is a component that forms at least a portion of the electrical paths between multiple electronic components 10 and / or at least a portion of the electrical paths between the electronic components 10 and an external device. In this disclosure, the term "wiring board" refers to a board-type wiring structure. "Board-type" refers to a plate-like structure that is flat when viewed overall, regardless of its detailed shape. In this disclosure, "plate-like," "sheet-like," or "flat" does not necessarily mean a completely flat structure, but may also include a surface that partially contains a fixing structure or rib that protrudes in the Z direction, or a surface that has an uneven shape that conforms to the thickness of the bus bar. In this embodiment, the wiring board 40 is a plate-like structure that is flat in the X and Y directions.

[0048] The wiring board 40 includes, for example, a base plate 41, one or more (e.g., a plurality of) bus bars 42, and a plurality of fastening members 43. In this embodiment, the base plate 41 and the plurality of bus bars 42 are integrated by insert molding. For example, the wiring board 40 is formed as a single member by insert molding the bus bars 42 with the base plate 41 after the fastening members 43 are fixed to the bus bars 42. In other words, the bus bars 42 are integrated with the base plate 41 without using fastening members such as screws or bolts. Note that the wiring board 40 may be formed by another structure instead of insert molding. A modified example in which the wiring board 40 is formed by another structure will be described later.

[0049] 9 is a perspective view showing a partly exploded view of the wiring board 40. For convenience of explanation, the base plate 41, the bus bar 42, and the fastening member 43 will be described below with reference to the partly exploded view of the wiring board 40.

[0050] (base plate) The base plate 41 is a holding member that integrally holds together a plurality of bus bars 42 that are arranged horizontally at intervals from one another. The base plate 41 is made of, for example, synthetic resin and has insulating properties. The base plate 41 electrically insulates the plurality of bus bars 42 from one another. The base plate 41 is an example of a "base member." The base plate 41 may also be referred to as an "insulating substrate." The base plate 41 has, for example, a flat portion 51 and a plurality of fixing portions 52. The fixing portions 52 will be described later.

[0051] The flat surface portion 51 is a plate-shaped portion of the base plate 41. The flat surface portion 51 is a plate-shaped portion extending in the horizontal direction. The flat surface portion 51 forms the main portion of the base plate 41. The flat surface portion 51 forms the base portion (insulating base portion) of the base plate 41. In this embodiment, the flat surface portion 51 extends across the entire width of the base plate 41 in the X direction and across the entire width of the base plate 41 in the Y direction, excluding the four corner portions of the base plate 41.

[0052] The flat 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 flat surface extending along the horizontal direction. The first surface 51a faces the multiple electronic components 10 and also faces the insulating cover 93 (see FIG. 1) of the electrical connection unit 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 flat surface extending along the horizontal direction. The second surface 51b faces the metal plate 80 (see FIG. 1). The thickness direction (plate thickness direction) of the flat portion 51 is the Z direction.

[0053] The flat portion 51 has, for example, one or more (e.g., multiple) accommodating portions 55 that each accommodate a bus bar 42. The multiple accommodating portions 55 are formed spaced apart from one another in the X direction or the Y direction. Each accommodating portion 55 is, for example, a through-hole that penetrates the flat portion 51 in the Z direction. Note that, instead of a through-hole, the accommodating portion 55 may be a recess that is provided on the first surface 51a or the second surface 51b of the flat portion 51 and recessed in the Z direction. Note that in the present disclosure, the phrase "an accommodating portion penetrates the flat portion in the first direction (Z direction)" may also include a case where only a portion of the entire length of the accommodating portion 55 penetrates the flat portion 51 in the Z direction (for example, the remaining portion of the accommodating portion 55 may be a recess that is recessed in the Z direction, or may be provided inside the base plate 41 and not exposed to the outside of the base plate 41). Similarly, in the present disclosure, "the storage section is recessed in the first direction (Z direction)" may also include the case where only a portion of the overall length of the storage section 55 is recessed in the Z direction (for example, the remaining portion of the storage section 55 may be a through hole that penetrates the planar section 51 in the Z direction, or may be provided inside the base plate 41 and not exposed to the outside of the base plate 41).

[0054] When viewed from the Z direction, each accommodating portion 55 has an outer shape corresponding to the shape of the bus bar 42 to be accommodated. In this embodiment, the planar portion 51 includes the plurality of accommodating portions 55, for example, five accommodating portions 55A, 55B, 55C, 55D, and 55E. The accommodating portion 55A is provided corresponding to a bus bar 42A (described later) and accommodates the bus bar 42A. The accommodating portion 55B is provided corresponding to a bus bar 42B (described later) and accommodates the bus bar 42B. The accommodating portion 55C is provided corresponding to a bus bar 42C (described later) and accommodates the bus bar 42C. The accommodating portion 55D is provided corresponding to a bus bar 42D (described later) and accommodates the bus bar 42D. The accommodating portion 55E is provided corresponding to a bus bar 42E (described later) and accommodates the bus bar 42E.

[0055] (busbar) The busbars 42 are routing members (electrical connection members) included in the routing board 40. The busbars 42 are, for example, routing members for electrically connecting multiple electronic components 10. Alternatively, the busbars 42 may be routing members for connecting the electronic components 10 to an external device. The busbars 42 are made of metal (for example, copper or a copper alloy) and are electrically conductive. In this embodiment, the routing board 40 has, as the multiple busbars 42, for example, five busbars 42A, 42B, 42C, 42D, and 42E. The five busbars 42A, 42B, 42C, 42D, and 42E are arranged horizontally at intervals from one another. The five busbars 42A, 42B, 42C, 42D, and 42E include portions that are arranged on the same plane. The five bus bars 42A, 42B, 42C, 42D, and 42E are held by a flat portion 51 of the base plate 41.

[0056] At least a portion of each busbar 42 has a plate shape extending in the horizontal direction. At least a portion of each busbar 42 is housed in the housing portion 55 and extends along the flat portion 51. That is, at least a portion of each busbar 42 extends along the first surface 51a of the flat portion 51. At least a portion of each busbar 42 extends horizontally within the housing portion 55. In this embodiment, each busbar 42 has a plate shape extending in the horizontal direction over the entire length of the busbar 42. Each busbar 42 is housed in the housing portion 55 over the entire length of the busbar 42 and extends along the flat portion 51. Hereinafter, the portion of each busbar 42 housed in the housing portion 55 and extending along the flat portion 51 may be referred to as a "plate portion 42p." The busbar 42 is a component that forms a horizontal current path. The busbar 42 may also be referred to as a "horizontal routing component."

[0057] 10 is a plan view showing the wiring board 40. The plate portion 42p of each bus bar 42 has, for example, a first connection portion 61, a second connection portion 62, and an extension portion 63.

[0058] The first connection portion 61 is a portion that comes into contact with one connection component 20 (hereinafter referred to as the "first connection component 20"). The first connection component 20 is a connection component that connects one electronic component 10 (hereinafter referred to as the "first electronic component 10") to the bus bar 42. The first connection portion 61 is a portion of the bus bar 42 that overlaps with the first connection component 20 when viewed from the Z direction. The first connection portion 61 is adjacent to the first connection component 20 in the Z direction and is connected to the first connection component 20 from the Z direction.

[0059] The second connection portion 62 is a portion that comes into contact with another connection component 20 (hereinafter referred to as the "second connection component 20"). The second connection component 20 is a connection component that connects another electronic component 10 (hereinafter referred to as the "second electronic component 10") included in the plurality of electronic components 10 to the bus bar 42. The second connection portion 62 is a portion of the bus bar 42 that overlaps with the second connection component 20 when viewed from the Z direction. The second connection portion 62 is adjacent to the second connection component 20 in the Z direction and is connected to the second connection component 20 from the Z direction.

[0060] Alternatively, the second connection portion 62 may be a portion that comes into contact with another connection component 30 (hereinafter referred to as the "second connection component 30") instead of the above example. The connection component 30 is a connection component for connecting an external device to the bus bar 42. In this case, the second connection portion 62 is a portion of the bus bar 42 that overlaps with the second connection component 30 when viewed from the Z direction. The second connection portion 62 is adjacent to the second connection component 30 in the Z direction and is connected to the second connection component 30 from the Z direction.

[0061] Furthermore, the second connection portion 62 may be a portion that comes into contact with the coupling bus bar 75 for connecting to another subunit SU, instead of the connection parts 20 and 30. In this case, the second connection portion 62 is a portion of the bus bar 42 that overlaps with the coupling bus bar 75 when viewed from the Z direction. The second connection portion 62 is adjacent to the coupling bus bar 75 in the Z direction, and is connected to the coupling bus bar 75 from the Z direction.

[0062] The extending portion 63 extends in the X direction or the Y direction from the first connecting portion 61. The extending portion 63 is provided between the first connecting portion 61 and the second connecting portion 62. The extending portion 63 extends across the first connecting portion 61 and the second connecting portion 62. The extending portion 63 connects the first connecting portion 61 and the second connecting portion 62.

[0063] In this embodiment, the first connection portion 61, the second connection portion 62, and the extension portion 63 are plate-shaped and extend in the horizontal direction. In this embodiment, each bus bar 42 is housed in the housing portion 55 across at least the first connection portion 61 and the second connection portion 62, and extends along the flat portion 51. For example, the first connection portion 61, the second connection portion 62, and the extension portion 63 are housed in the housing portion 55 and extend along the flat portion 51.

[0064] In this embodiment, the extension portions 63 of some of the bus bars 42 are accommodated in the accommodation portion 55, and thereby pass through the region R that overlaps with the electronic component 10 when viewed from the Z direction, and extend to both sides of the region R. For example, the extension portions 63 extend linearly along the X direction. The extension portions 63 extend through the region R that overlaps with the electronic component 10 when viewed from the Z direction, and extend to both the +X direction side and the −X direction side of the region R. In other words, by accommodating the bus bars 42 in the accommodation portion 55, they can be more easily routed along a better route (for example, a route with a shorter distance) without being obstructed by the presence of the electronic component 10.

[0065] Furthermore, one or more bus bars 42 may have an extension portion 64 in addition to the first connection portion 61, the second connection portion 62, and the extension portion 63. The extension portion 64 is a portion of the bus bar 42 extended for the purpose of increasing the heat dissipation area and / or the heat capacity for heat storage (heat absorption). The extension portion 64 is a portion not used for electrical connection. For example, the extension portion 64 is located on the opposite side of the extension portion 63 from the first connection portion 61 (or the second connection portion 62). The extension portion 64 has a plate shape extending horizontally. The extension portion 64 is housed in the housing portion 55 and extends along the flat portion 51. The extension portion 64 extends to a region R that overlaps with the electronic component 10 when viewed from the Z direction, and has an end 42e1 of the bus bar 42 at a position that overlaps with the electronic component 10 when viewed from the Z direction.

[0066] Below, several examples of busbar 42 routing will be described. The plurality of electronic components 10 includes three electronic components 10A, 10B, and 10C. Electronic component 10A and electronic component 10B are, for example, a first-type electronic component 10M. Electronic component 10C is, for example, a second-type electronic component 10N. The types of electronic components 10 are not limited to the above examples. The plurality of connection components 20 include six connection components 20A, 20B, 20C, 20D, 20E, and 20F. The plurality of connection components 30 include two connection components 30A and 30B. The plurality of coupling bus bars 75 include two coupling bus bars 75A and 75B. The plurality of external connection bus bars 76 include two external connection bus bars 76A and 76B.

[0067] (1st wiring example) First, an example of wiring of bus bar 42A will be described. Bus bar 42A has a first connection portion 61, a second connection portion 62, and an extension portion 63. When viewed from the Z direction, first connection portion 61 is located on the +X direction side of electronic component 10A. First connection portion 61 is electrically connected to terminal 13A of electronic component 10A via connection component 20A, which is first connection component 20. Second connection portion 62 is located on the −X direction side of electronic component 10A when viewed from the Z direction. Second connection portion 62 is electrically connected to another subunit SU via coupling bus bar 75A.

[0068] By being accommodated in accommodation portion 55, extension portion 63 passes through region R that overlaps with electronic component 10A when viewed from the Z direction, and extends to both sides of region R. For example, extension portion 63 extends linearly along the X direction. Extension portion 63 extends through region R that overlaps with electronic component 10A when viewed from the Z direction, to both the +X direction side and the −X direction side of region R. Bus bar 42A is an example of a “first bus bar.” Accommodation portion 55A that accommodates bus bar 42A is an example of a “first accommodation portion.” Bus bar 42A is, for example, a bus bar included in a positive electrode line PL of electrical connection unit 1.

[0069] (Second wiring example) Next, an example of wiring of the busbar 42B will be described. The busbar 42B has a first connection portion 61, a second connection portion 62, an extension portion 63, and an extension portion 64. The first connection portion 61 is electrically connected to a terminal 13B of the electronic component 10A via a connection component 20B, which is the first connection component 20. The second connection portion 62 is electrically connected to an external connection busbar 76A via a connection component 30A, which is the second connection component 30. The extension portion 64 extends to a region R that overlaps with the electronic component 10A when viewed from the Z direction, and has an end 42e1 of the busbar 42 at a position that overlaps with the electronic component 10A. Note that, like the busbar 42A, the busbar 42B may have an extension portion 63 that passes through the region R that overlaps with the electronic component 10A when viewed from the Z direction and extends to both sides of the region R. The busbar 42B is another example of a "first busbar." The accommodation portion 55B that accommodates the bus bar 42B is another example of a "first accommodation portion." From another perspective, the bus bar 42B is an example of a "second bus bar." The accommodation portion 55B is another example of a "second accommodation portion." The bus bar 42B is, for example, a bus bar included in the positive electrode line PL of the electrical connection unit 1.

[0070] (3rd wiring example) Next, an example of wiring of the busbar 42C will be described. The busbar 42C has a first connection portion 61, a second connection portion 62, an extension portion 63, and an extension portion 64. The first connection portion 61 is electrically connected to a terminal 13B of the electronic component 10B via a connection component 20C, which is the first connection component 20. The second connection portion 62 is electrically connected to another subunit SU via a coupling 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 42e1 of the busbar 42 at a position that overlaps with the electronic component 10B when viewed from the Z direction. The busbar 42C is another example of a "first busbar." The accommodation portion 55C that accommodates the busbar 42C is another example of a "first accommodation portion." The busbar 42C is, for example, a busbar included in the negative electrode line NL of the electrical connection unit 1. From another perspective, bus bar 42C is an example of a “third bus bar.” Container portion 55C is an example of a “third container portion.”

[0071] (4th wiring example) Next, an example of wiring of the busbar 42D will be described. The busbar 42D has a first connection portion 61, a second connection portion 62, and an extension portion 63. The first connection portion 61 is electrically connected to a terminal 13A of the electronic component 10B via a connection part 20D, which is a first connection part 20. The second connection portion 62 is electrically connected to a terminal 13B of the electronic component 10C via a connection part 20E, which is a second connection part 20. The busbar 42D is another example of a "first busbar." The accommodation portion 55D that accommodates the busbar 42D is another example of a "first accommodation portion." The busbar 42D is, for example, a busbar included in the negative electrode line NL of the electrical connection unit 1. From another perspective, the busbar 42D is another example of a "third busbar." The accommodation portion 55D is another example of a "third accommodation portion."

[0072] (5th wiring example) Next, an example of wiring of the busbar 42E will be described. The busbar 42E has a first connection portion 61, a second connection portion 62, and an extension portion 63. The first connection portion 61 is electrically connected to a terminal 13A of the electronic component 10C via a connection part 20F, which is a first connection part 20. The second connection portion 62 is electrically connected to an external connection busbar 76B via a connection part 30B, which is a second connection part 30. The busbar 42E is another example of a "first busbar." The accommodation portion 55E that accommodates the busbar 42E is another example of a "first accommodation portion." The busbar 42E is, for example, a busbar included in the negative electrode line NL of the electrical connection unit 1. From another perspective, the busbar 42E is another example of a "third busbar." The accommodation portion 55E is another example of a "third accommodation portion."

[0073] (Fastening member) Next, returning to Fig. 9, fastening member 43 will be described. Fastening member 43 is a component for fastening bus bar 42 to a component to be connected to bus bar 42 (connection component 20, connection component 30, coupling bus bar 75, or connection component 100). Fastening member 43 is, for example, a crimp bolt fixed to bus bar 42. Fastening member 43 is an example of a "fastening portion."

[0074] In this embodiment, each of the first connection portion 61 and the second connection portion 62 of the bus bar 42 has a through hole 42h. The through hole 42h penetrates the bus bar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion 43a and a head portion 43b. The circumferential surface of the shaft portion 43a has a thread groove. The head portion 43b has a larger diameter than the shaft portion 43a. The fastening member 43 is fixed to the bus bar 42 by crimping, with the shaft portion 43a passing through the through hole 42h of the bus bar 42. With this fixation, the fastening member 43 is electrically and physically connected to the bus bar 42, with the shaft portion 43a protruding from the through hole 42h of the bus bar 42 in the +Z direction. Note that the fastening member 43 is not limited to being fixed by crimping, and may be fixed to the bus bar 42 by welding or other methods.

[0075] In this embodiment, the connecting part 20 is first fixed to the electronic part 10 by the fastening member 71 or the fastening member 72, and then attached to the fastening member 43 from the Z direction. For example, the shaft portion 43a of the fastening member 43 is inserted into the mounting hole 22h of the second part 22 of the connecting part 20. Then, an engaging member 44 (e.g., a nut) is engaged with the shaft portion 43a of the fastening member 43 protruding from the mounting hole 22h of the second part 22 of the connecting part 20. The engaging member 44 is attached to the shaft portion 43a, for example, along the Z direction. This engagement fixes the second part 22 of the connecting part 20 to the fastening member 43.

[0076] <4. Metal plates, insulating sheets, heat transfer members, and insulating covers> Next, the metal plate 80, the insulating sheet 91, the heat transfer member 92, and the insulating cover 93 will be described.

[0077] <4.1 Metal Plate> 11 is a partially exploded perspective view of the electrical connection unit 1. The metal plate 80 is a member that ensures the rigidity of the electrical connection unit 1 and also enhances the heat dissipation properties of the electrical connection unit 1. The metal plate 80 is made of metal (for example, aluminum or an aluminum alloy). The metal plate 80 may also be referred to as a "rigid member."

[0078] When viewed from the Z direction, the metal plate 80 has a rectangular shape extending along the X 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 in the longitudinal direction of the metal plate 80 and are spaced apart in the X direction. The third end 80e3 and the fourth end 80e4 are a pair of ends in the lateral direction of the metal plate 80 and are spaced apart in the Y direction. The metal plate 80 includes, for example, a flat portion 81, a plurality of fixing portions 82, and a plurality of fixing portions 83.

[0079] The flat surface portion 81 is a portion of the metal plate 80 that is formed into a plate shape. The flat surface portion 81 is a plate-like portion that extends horizontally. The flat surface portion 81 forms the main portion of the metal plate 80. The flat surface portion 81 forms the base (metal base) of the metal plate 80. In this embodiment, the flat surface portion 81 is large enough to cover the three subunits SU from below. The flat surface portion 81 faces the wiring board 40 of the three subunits SU. In this embodiment, the metal plate 80 faces the second surface 51b of the flat surface portion 51 of each subunit SU, with a gap S1 (see FIG. 13) between it and the second surface 51b of the flat surface portion 51 of each subunit SU. The gap S1 is an example of a "first gap."

[0080] The fixing portions 82 are fixing portions for fixing the base plate 41 of each subunit SU to the metal plate 80. When viewed from the Z direction, the fixing portions 82 are provided at positions corresponding to the fixing portions 52 of the base plate 41 of each subunit SU. The fixing portions 82 are cylindrical or prismatic bosses that protrude in the +Z direction from the flat portion 81 of the metal plate 80. The fixing portions 82 will be described in detail later.

[0081] The fixing portions 83 are fixing portions for fixing the electronic components 10 of each subunit SU directly to the metal plate 80 without using the base plate 41. When viewed from the Z direction, the fixing portions 83 are provided at positions corresponding to the mounting portions 14 of the electronic components 10 of each subunit SU. The fixing portions 83 are cylindrical or prismatic bosses that protrude in the +Z direction from the flat portion 81. The fixing portions 83 will be described in detail later.

[0082] <4.2 Insulation sheet> The insulating sheet 91 is an insulating member for electrically insulating the metal plate 80 from the bus bars 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 has a rectangular shape when viewed from the Z direction. The insulating sheet 91 has a sheet shape that extends horizontally. The insulating sheet 91 is disposed between the flat surface 81 of the metal plate 80 and the wiring board 40 of each subunit SU. For example, the insulating sheet 91 is disposed between the flat surface 81 of the metal plate 80 and a plurality of heat transfer members 92.

[0083] In this embodiment, the insulating sheet 91 is attached 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. Note that, instead of the above example, the insulating sheet 91 may be provided between the wiring board 40 of each subunit SU and the plurality of heat transfer members 92. Note that if the heat transfer members 92 have insulating properties and the necessary insulation is ensured by the heat transfer members 92, the insulating sheet 91 may be omitted.

[0084] 4.3 Heat transfer materials The heat transfer member 92 is a member for transferring heat generated by the electronic component 10 when current is applied and / or heat (Joule heat) generated by the bus bar 42 itself when current is applied to the metal plate 80. The heat transfer member 92 is, for example, an elastic heat transfer sheet (for example, a thermally conductive silicone sheet). The heat transfer member 92 is formed of, for example, a material with higher thermal conductivity than the base plate 41. However, the heat transfer member 92 is not limited to the above example, and may be a heat transfer member formed of a thermally conductive gel or other material.

[0085] 12 is a bottom view showing the wiring board 40. In this embodiment, the plurality of heat transfer members 92 are provided partially on the wiring board 40. For example, the plurality of heat transfer members 92 are arranged at positions overlapping with portions of the bus bars 42 when viewed from the Z direction. Furthermore, the plurality of heat transfer members 92 are arranged at positions overlapping with portions of the bus bars 42 near the electronic components 10 (e.g., electronic components 10A and 10B) when viewed from the Z direction. In this embodiment, the plurality of heat transfer members 92 are arranged at positions overlapping with the connecting components 20 when viewed from the Z direction.

[0086] Fig. 13 is a cross-sectional view taken along line F13-F13 of the structure shown in Fig. 10. In this embodiment, heat transfer member 92 is disposed between metal plate 80 and bus bar 42. Heat transfer member 92 transfers heat transferred from electronic component 10 to bus bar 42 and / or heat generated in bus bar 42 from bus bar 42 to metal plate 80.

[0087] In this embodiment, a portion of the heat transfer member 92 contacts the bus bar 42 at a position that overlaps the connection component 20 when viewed from the Z direction. In this case, the heat transfer member 92 makes it easier to transfer heat that is transferred from the terminal 13 of the electronic component 10 to the connection component 20 from the connection component 20 to the metal plate 80 via the bus bar 42.

[0088] In this embodiment, a portion of the heat transfer member 92 is disposed at a position overlapping with the head 43b of the fastening member 43 when viewed from the Z direction, and is in contact with the head 43b of the fastening member 43. In this case, the heat transfer member 92 facilitates the transfer of heat, which is transferred from the terminal 13 of the electronic component 10 to the connecting part 20, from the fastening member 43 to the metal plate 80.

[0089] In this embodiment, a portion of the heat transfer member 92 contacts the bus bar 42 at a position that overlaps the electronic component 10 when viewed from the Z direction. In this case, the heat transfer member 92 makes it easier to transfer heat, which is transferred from the electronic component 10 to the bus bar 42, from the bus bar 42 to the metal plate 80. In the example shown in FIG. 13 , the upper surface of the bus bar 42 contacts the electronic component 10, so that the bus bar 42 is thermally connected to the electronic component 10. Note that the portion of the bus bar 42 that is thermally connected to the electronic component 10 may be the extension portion 63 or the extension portion 64.

[0090] (Variation) 14 is a cross-sectional view showing one modified example. In this modified example, an air layer AS, which is a gap, exists between the bus bar 42 and the electronic component 10. The bus bar 42 is thermally connected to the electronic component 10 via the air layer AS. With this configuration, heat generated by the electronic component 10 transfers to the bus bar 42 through the air layer AS. The heat transferred to the bus bar 42 is transferred to the metal plate 80 via the heat transfer member 92 and dissipated there.

[0091] (Variation) FIG. 15 is a cross-sectional view showing another modified example. In this modified example, a heat transfer member 98 is provided between the bus bar 42 and the electronic component 10. The heat transfer member 98 is interposed between the bus bar 42 and the electronic component 10 in the Z direction. The bus bar 42 is thermally connected to the electronic component 10 via the heat transfer member 98. The heat transfer member 98 transfers heat generated by the electronic component 10 to the bus bar 42. The heat transfer member 98 is, for example, an elastic heat transfer sheet (e.g., a thermally conductive silicone sheet). However, the heat transfer member 98 is not limited to the above example and may be a heat transfer member made of a thermally conductive gel or other material. With this configuration, heat generated by the electronic component 10 is efficiently transferred to the bus bar 42 via the heat transfer member 98. The heat transferred to the bus bar 42 is transferred to the metal plate 80 via the heat transfer member 92 and dissipated there.

[0092] <4.4 Insulation cover> Returning to FIG. 1, the insulating cover 93 will be described. The insulating cover 93 is a member for preventing fingers from touching the electrical paths of the main body unit MU. The insulating cover 93 is made of, for example, synthetic resin and has insulating properties. The insulating cover 93 is, for example, box-shaped with an open side in the -Z direction. The insulating cover 93 has multiple air vents 93h. The insulating cover 93 is attached to the metal plate 80 along the Z direction. Note that the insulating cover 93 is not limited to a box-shaped member, and may be a sheet-shaped member that covers the electrical paths of the main body unit MU.

[0093] <5. Exposed busbar structure> Next, the exposed structure of the bus bar 42 will be described.

[0094] <5.1 Exposed structure on the top side of the busbar> First, the exposed structure of the upper surface side of the busbar 42 will be described with reference to Fig. 8. In this embodiment, at least a portion of the extension portion 63 of the busbar 42 is exposed to the outside of the base plate 41 on the upper surface side (the side of the first surface 51a of the flat portion 51). For example, the extension portion 63 of the busbar 42 is exposed to the outside of the base plate 41 on the upper surface side at least in a part of the region R (see Fig. 10) that overlaps with the electronic component 10 when viewed from the Z direction.

[0095] In this embodiment, the bus bar 42 is accommodated in the accommodation portion 55 over at least the entire length between the first connection portion 61 and the second connection portion 62 and extends along the first surface 51a of the flat portion 51. The bus bar 42 is exposed to the outside of the base plate 41 on the upper surface side over at least the entire length between the first connection portion 61 and the second connection portion 62.

[0096] In this embodiment, bus bar 42 is accommodated in accommodation portion 55 over the entire length of bus bar 42 and extends along first surface 51a of flat portion 51. Bus bar 42 is exposed to the outside of base plate 41 on the upper surface side over the entire length of bus bar 42.

[0097] 13, at least a portion of the extending portion 63 of the bus bar 42 is exposed to the outside of the base plate 41 not only on the upper surface side but also on the lower surface side (the side facing the second surface 51b). For example, the lower surface side of the bus bar 42 is exposed to the outside of the base plate 41 over the entire length of the bus bar 42.

[0098] (Variation) 16 is a cross-sectional view showing one modified example. In this modified example, the flat portion 51 of the base plate 41 has a cover portion 51v on the lower surface side (the second surface 51b side) that covers at least a part of the extension portion 63 of the bus bar 42. In the area covered by the cover portion 51v, the bus bar 42 is not exposed on the lower surface side. The cover portion 51v may be provided over the entire length of the bus bar 42. Note that the cover portion 51v does not have to be provided in an area that overlaps with, for example, the heat transfer member 92 when viewed from the Z direction.

[0099] <5.2 Exposed structure of the underside of the busbar> Next, the exposed structure of the lower surface side of the busbar 42 will be described with reference to Fig. 13. In this embodiment, the plate portion 42p of the busbar 42 includes an exposed portion 42u on the lower surface side (the second surface 51b side of the flat portion 51) that is exposed to the outside of the base plate 41. In this embodiment, the exposed portion 42u of the busbar 42 extends over the entire length of the busbar 42. In this embodiment, the heat transfer member 92 is disposed between the exposed portion 42u of the busbar 42 and the metal plate 80. For example, the heat transfer member 92 contacts the exposed portion 42u of the busbar 42.

[0100] In this embodiment, at least a portion of the exposed portion 42u of the bus bar 42 is provided in a region that overlaps with the connection part 20 when viewed from the Z direction. At least a portion of the heat transfer member 92 overlaps with the exposed portion 42u of the bus bar 42 in a region that overlaps with the connection part 20 when viewed from the Z direction. For example, at least a portion of the heat transfer member 92 is in contact with the exposed portion 42u of the bus bar 42 in a region that overlaps with the connection part 20 when viewed from the Z direction.

[0101] In this embodiment, the exposed portion 42u of the busbar 42 includes a first portion 42ua arranged in an area that overlaps with the connecting component 20 when viewed from the Z direction, and a second portion 42ub arranged in an area that overlaps with the electronic component 10 when viewed from the Z direction.

[0102] The heat transfer member 92 includes a first heat transfer portion 92a and a second heat transfer portion 92b. The first heat transfer portion 92a overlaps with the first portion 42ua of the exposed portion 42u of the busbar 42 in a region that overlaps with the connection part 20 when viewed from the Z direction. For example, the first heat transfer portion 92a contacts the first portion 42ua of the exposed portion 42u of the busbar 42. On the other hand, the second heat transfer portion 92b overlaps with the second portion 42ub of the exposed portion 42u of the busbar 42 in a region that overlaps with the electronic component 10 when viewed from the Z direction. For example, the second heat transfer portion 92b contacts the second portion 42ub of the exposed portion 42u of the busbar 42.

[0103] As described above, at least a portion of the extending portion 63 of the bus bar 42 is exposed to the outside of the base plate 41 not only on the lower surface side but also on the upper surface side (first surface 51a side). For example, the bus bar 42 is exposed to the outside of the base plate 41 on the upper surface side over the entire length of the bus bar 42. For example, the second portion 42ub of the exposed portion 42u of the bus bar 42 is exposed to the outside of the base plate 41 not only on the lower surface side but also on the upper surface side, and faces the electronic component 10.

[0104] (Variation) 17 is a cross-sectional view showing one modified example. In this modified example, the planar portion 51 of the base plate 41 has a cover portion 51v on the upper surface side (first surface 51a side) that covers at least a part of the extension portion 63 of the bus bar 42. In the area covered by the cover portion 51v, the bus bar 42 is not exposed on the upper surface side. The cover portion 51v may be provided over the entire length of the bus bar 42. The cover portion 51v does not have to be provided in the area that overlaps with the first connection portion 61 and the second connection portion 62 when viewed from the Z direction, for example.

[0105] <6. Three-dimensional busbar wiring structure> Next, the three-dimensional wiring structure CS of the bus bar 42 will be described. Fig. 18 is a perspective view showing the three-dimensional wiring structure CS of the busbar 42. Fig. 19 is a plan view showing the three-dimensional wiring structure CS of the busbar 42. The three-dimensional wiring structure CS has busbar 42F, busbar 42G, busbar 42H, and busbar 42I as the multiple busbars 42. The three-dimensional wiring structure CS also includes multiple connecting parts 100. The three-dimensional wiring structure CS also includes coupling busbar 75C and coupling busbar 75D as the multiple coupling busbars 75.

[0106] The busbar 42F and the busbar 42G are, for example, busbars 42 included in the subunit SUY. The flat portion 51 of the base plate 41 of the subunit SUY has a plurality of housing portions 55, namely, housing portion 55F and housing portion 55G. The busbar 42F is housed in housing portion 55F and extends along the flat portion 51. The busbar 42G is housed in housing portion 55G and extends along the flat portion 51. The busbar 42F is an example of a "first busbar." The housing portion 55F that houses the busbar 42F is an example of a "first housing portion." The busbar 42G is an example of a "fourth busbar." The housing portion 55G that houses the busbar 42G is an example of a "fourth housing portion." The busbar 42F and the busbar 42G are busbars 42 located in the first layer (lower layer) of the three-dimensional wiring structure CS.

[0107] In this embodiment, bus bar 42F has a first portion 42Fa extending in the X direction and a second portion 42Fb bending from first portion 42Fa and extending in the Y direction. Second portion 42Fb extends along boundary B between subunit SUY and subunit SUZ.

[0108] On the other hand, busbar 42H and busbar 42I are, for example, busbars 42 included in subunit SUZ. Planar portion 51 of base plate 41 of subunit SUZ has housing portion 55H and housing portion 55I as the multiple housing portions 55. Busbar 42H is housed in housing portion 55I and extends along planar portion 51. Busbar 42H is housed in housing portion 55I and extends along planar portion 51. Busbar 42H and busbar 42I are busbars 42 located in the first layer (lower layer) of three-dimensional wiring structure CS.

[0109] The connecting component 100 has a configuration similar to the connecting component 30 for external connection described above. For example, the connecting component 100 has a first portion 101, a second portion 102, and a third portion 103. Details of the connecting component 100 can be obtained by replacing "connecting component 30" with "connecting component 100," "first portion 31" with "first portion 101," "first mounting hole 31h" with "first mounting hole 101h," "second portion 32" with "second portion 102," "second mounting hole 32h" with "second mounting hole 102h," and "third portion 33" with "third portion 103" in the description of the connecting component 30 described above. The connecting component 100 is a component that forms a vertical electrical path. The connecting component 100 may also be referred to as a "vertical routing component."

[0110] The multiple connection parts 100 include connection part 100A and connection part 100B. When viewed from the Z direction, connection part 100A overlaps with the second connection part 62 of bus bar 42G in subunit SUY. Connection part 100A is adjacent to the second connection part 62 of bus bar 42G in the Z direction and is connected to the second connection part 62 of bus bar 42G from the Z direction. Connection part 100A stands upright from bus bar 42G in the +Z direction. Connection part 100A is an example of a "third connection part."

[0111] When viewed from the Z direction, connection part 100B overlaps with second connection part 62 of bus bar 42I in subunit SUZ. Connection part 100B is adjacent to second connection part 62 of bus bar 42I in the Z direction, and is connected to second connection part 62 of bus bar 42I from the Z direction. Connection part 100B stands upright in the +Z direction from bus bar 42I.

[0112] One end of the connecting busbar 75C is adjacent to the second connection portion 62 of the busbar 42F in the Z direction in the subunit SUY and is connected to the second connection portion 62 of the busbar 42F from the Z direction. The other end of the connecting busbar 75C is adjacent to the second connection portion 62 of the busbar 42H in the subunit SUZ in the Z direction and is connected to the second connection portion 62 of the busbar 42H from the Z direction. With this configuration, the busbar 42F of the subunit SUY and the busbar 42H of the subunit SUZ are electrically connected via the connecting busbar 75C. The connecting busbar 75C is the busbar 75 located in the first layer (lower layer) of the three-dimensional wiring structure CS.

[0113] On the other hand, in subunit SUY, coupling bus bar 75D is adjacent to first portion 101 of connection part 100A in the Z direction and is connected to first portion 101 of connection part 100A from the Z direction. The other end of coupling bus bar 75D is adjacent to first portion 101 of connection part 100B in the Z direction and is connected to first portion 101 of connection part 100B from the Z direction in subunit SUZ.

[0114] The coupling bus bar 75D is supported by the first portion 101 of the connection part 100A and the first portion 101 of the connection part 100B at a position spaced apart from the bus bar 42F in the Z direction. The coupling bus bar 75D is supported by the first portion 101 of the connection part 100A and the first portion 101 of the connection part 100B and extends horizontally (e.g., in the X direction). The coupling bus bar 75D is electrically connected to the first portion 101 of the connection part 100A and the first portion 101 of the connection part 100B. With this configuration, the bus bar 42F of the subunit SUY and the bus bar 42I of the subunit SUZ are electrically connected via the two connection parts 100 and the coupling bus bar 75D. The coupling bus bar 75D is an example of a "fifth bus bar."

[0115] In the present embodiment, coupling bus bar 75D extends so as to straddle second portion 42Fb of bus bar 42F at a position spaced apart from bus bar 42F in the +Z direction. This forms a three-dimensional intersection structure between coupling bus bar 75D and bus bar 42F. In the present embodiment, coupling bus bar 75D extends so as to straddle boundaries B between multiple subunits SU.

[0116] In this embodiment, the three-dimensional routing structure CS of the busbar 42 is provided at a position that straddles the boundary B between the plurality of subunits SU. With this arrangement, the three-dimensional routing structure CS reinforces the connection structure between the plurality of subunits SU. Note that instead of being provided at the boundary B between the plurality of subunits SU, the three-dimensional routing structure CS of the busbar 42 may be provided inside one or more of the subunits SU.

[0117] <7. Fixed structure> Next, the anchoring structure of the subunit SU will be described.

[0118] <7.1 Structure of Metal Plate> Fig. 20 is a cross-sectional view taken along line F20-F20 of the structure shown in Fig. 10. The metal plate 80 has the fixing portion 82 and the fixing portion 83, as described above.

[0119] The fixing portion 82 is a boss that protrudes in the +Z direction from the flat portion 81 of the metal plate 80. The fixing portion 82 protrudes, for example, further in the +Z direction than the first surface 51a of the flat portion 51 of the base plate 41. In this embodiment, the fixing portion 82 protrudes more in the +Z direction than the fixing portion 83, which will be described later. The fixing portion 82 faces the fixing portion 52 of the base plate 41 in the Z direction. The fixing portion 82 has an engagement hole 82h that opens in the +Z direction. The inner surface of the engagement hole 82h has a thread groove. The fixing portion 82 is an example of a "first fixing portion." The engagement hole 82h is an example of a "first engagement hole."

[0120] The fixing portion 83 is a boss protruding from the flat portion 81 in the +Z direction. The fixing portion 83 is inserted into a through hole 51h (described later) in the flat portion 51 of the base plate 41. For example, the fixing portion 83 passes through the through hole 51h in the flat portion 51 and protrudes to a position flush with the first surface 51a of the flat portion 51 or to a position beyond the first surface 51a of the flat portion 51 (a position on the +Z direction side of the first surface 51a). The fixing portion 83 faces the mounting portion 14 of the electronic component 10 in the Z direction. The fixing portion 83 has an engagement hole 83h that opens in the +Z direction. The inner circumferential surface of the engagement hole 83h has a thread groove. The fixing portion 83 is an example of a "second fixing portion." The engagement hole 83h is an example of a "second engagement hole."

[0121] A fastening member 112 (e.g., a screw or a bolt) is passed through the mounting hole 14h of the mounting portion 14 of the electronic component 10 from the +Z direction side. When the fastening member 112 passed through the mounting hole 14h of the mounting portion 14 of the electronic component 10 engages with the engaging hole 83h of the fixing portion 83 of the metal plate 80, the electronic component 10 is fixed to the metal plate 80 without using the base plate 41. The fastening member 112 is an example of a "second fastening member."

[0122] <7.2 Structure of wiring board> The base plate 41 has a fixed portion 52 that is fixed to the fixed portion 82 of the metal plate 80. The fixed portion 52 has, for example, an upright plate portion 52a and a horizontal plate portion 52b.

[0123] The upright plate portion 52a stands in the +Z direction from the end of the flat portion 51 of the base plate 41. The upright plate portion 52a is a plate portion extending along the Y and Z directions. The thickness direction of the upright plate portion 52a is the X direction.

[0124] The horizontal plate portion 52b extends horizontally from the +Z-direction end of the upright plate portion 52a. The horizontal plate portion 52b is a plate portion that extends horizontally. The horizontal plate portion 52b faces the fixed portion 82 of the metal plate 80 in the Z direction. The horizontal plate portion 52b has an insertion hole 52h that faces the engagement hole 82h of the fixed portion 82 of the metal plate 80. A fastening member 111 (e.g., a screw or bolt) is passed through the insertion hole 52h. When the fastening member 111 passed through the insertion hole 52h of the fixed portion 52 of the base plate 41 engages with the engagement hole 82h of the fixed portion 82 of the metal plate 80, the base plate 41 is fixed to the metal plate 80. The fastening member 111 is an example of a "first fastening member."

[0125] Furthermore, the flat surface portion 51 of the base plate 41 has the above-described through hole 51h. The through hole 51h penetrates the flat surface portion 51 in the Z direction. When viewed from the Z direction, the through hole 51h is provided at a position corresponding to the fixing portion 83 of the metal plate 80. The fixing portion 83 of the metal plate 80 passes through the through hole 51h of the base plate 41 and protrudes to the same position as the first surface 51a of the flat surface portion 51 or further in the +Z direction than the first surface 51a of the flat surface portion 51. The mounting portion 14 of the electronic component 10 is fixed to the fixing portion 83 at the same position as the first surface 51a of the flat surface portion 51 or further in the +Z direction than the first surface 51a of the flat surface portion 51.

[0126] <8. Heat dissipation paths related to the fixed structure> Next, the heat dissipation path associated with the fixing portion 83 of the metal plate 80 will be described. FIG. 21 is a cross-sectional view illustrating a heat dissipation path associated with the fixing portion 83 of the metal plate 80. In this embodiment, the fixing portion 83 of the metal plate 80 is not in contact with a high-temperature portion (e.g., the terminal 13) of the electronic component 10. In this embodiment, a gap S2 through which air can pass is provided between the fixing portion 83 and the inner circumferential surface 51ha of the through hole 51h of the base plate 41. The through hole 51h may be opened wide so that a portion of the through hole 51h does not overlap with the mounting portion 14 of the electronic component 10 when viewed from the Z direction (so that a portion of the through hole 51h is located on the outer periphery of the mounting portion 14 when viewed from the Z direction). The fixing portion 83 is an example of a "protrusion."

[0127] In this embodiment, the temperature of the fixing portion 83 of the metal plate 80 tends to be lower than the temperature of the bus bar 42. In this case, convection occurs due to the temperature difference between the fixing portion 83 of the metal plate 80 (low temperature) and the bus bar 42 (high temperature).

[0128] Specifically, in response to the generation of an upward flow of warm air (see arrow A1) around the bus bar 42, a downward flow (see arrow A2) is generated around the fixing portion 83 of the metal plate 80, passing through the through hole 51h of the base plate 41 and heading downward toward the base plate 41. When this downward flow is generated, an upward flow (see arrow A3) is generated by being pushed out by the air moving with the downward flow. This upward flow is generated near the inner circumferential surface 51ha of the through hole 51h, so as to move the warm air in the gap S1 between the metal plate 80 and the base plate 41 upward (outside the gap S1). This prevents warm air from being trapped in the gap S1 between the metal plate 80 and the base plate 41, and promotes heat dissipation from the electrical connection unit 1.

[0129] (Variation) FIG. 22 is a cross-sectional view illustrating a modified example of the heat dissipation path. In this modified example, the metal plate 80 has a protrusion 84 instead of / in addition to the fixing portion 83. The protrusion 84 is a protrusion for heat dissipation. The protrusion 84 does not have to be used for the fixing structure. The protrusion 84 is a cylindrical or prismatic boss protruding in the +Z direction from the flat portion 81 of the metal plate 80. The protrusion 84 is inserted into the through-hole 51h of the flat portion 51 of the base plate 41. For example, the protrusion 84 passes through the through-hole 51h of the flat portion 51 and protrudes to a position flush with the first surface 51a of the flat portion 51 or to a position beyond the first surface 51a of the flat portion 51 (a position on the +Z direction side of the first surface 51a).

[0130] According to the configuration of this modified example, the temperature of the protruding portion 84 of the metal plate 80 tends to be lower than the temperature of the bus bar 42. In this case, convection occurs due to the temperature difference between the protruding portion 84 of the metal plate 80 (low temperature) and the bus bar 42 (high temperature). This causes air flows in the directions of the arrows A1 to A3 described above, and promotes heat dissipation from the electrical connection unit 1.

[0131] <9. Thermal expansion / contraction absorption structure related to the fixing structure> Next, the structure for absorbing thermal expansion / contraction related to the fixing structure will be described. FIG. 23 is a cross-sectional view illustrating a structure for absorbing thermal expansion / contraction associated with the fixing portion 82. In this embodiment, the wiring board 40 of the subunit SUX includes a base plate 41 and a bus bar 42. The flat portion 51 of the base plate 41 includes a housing portion 55 for housing the bus bar 42. The fixing portion 52 of the base plate 41 includes an upright plate portion 52a that stands in the Z direction from the flat portion 51 and a horizontal plate portion 52b that extends horizontally from the +Z-direction end of the upright plate portion 52a. The horizontal plate portion 52b is disposed at a position different from the first surface 51a in the Z direction. The horizontal plate portion 52b includes an insertion hole 52h through which a fastening member 111 is passed. The horizontal plate portion 52b is fixed to the fixing portion 82 of the metal plate 80 by the fastening member 111.

[0132] The metal plate 80 has a fixing portion 83 that protrudes from the flat portion 81 of the metal plate 80 and is inserted into the through-hole 51h of the base plate 41 to fix the electronic component 10. The length L1 in the Z direction of the standing plate portion 52a is greater than the length L2 in the Z direction of the fixing portion 83.

[0133] The bus bar 42 of the subunit SUX is an example of a "first bus bar." The base plate 41 of the subunit SUX is an example of a "first base member." The flat portion 51 of the subunit SUX is an example of a "first flat portion." The upright plate portion 52a of the subunit SUX is an example of a "first portion." The horizontal plate portion 52b of the subunit SUX is an example of a "second portion." The fixing portion 82 of the metal plate 80 is an example of a "first fixing portion." The fixing portion 83 of the metal plate 80 is an example of a "second fixing portion."

[0134] In this embodiment, the wiring board 40 of the subunit SUY has a base plate 41 and a bus bar 42. The flat portion 51 of the base plate 41 has an accommodation portion 55 that accommodates the bus bar 42. The fixing portion 52 of the base plate 41 has an upright plate portion 52a that stands in the Z direction from the flat portion 51 and a horizontal plate portion 52b that extends horizontally from the +Z direction end of the upright plate portion 52a. The horizontal plate portion 52b is disposed at a position different from the first surface 51a in the Z direction. The horizontal plate portion 52b of the base plate 41 of the subunit SUY overlaps with the horizontal plate portion 52b of the base plate 41 of the subunit SUX. The horizontal plate portion 52b of the base plate 41 of the subunit SUY has an insertion hole 52h through which the fastening member 111 is passed. The horizontal plate portion 52b of the base plate 41 of the subunit SUY is fastened together with the base plate 41 and horizontal plate portion 52b of the subunit SUX to the fixing portion 82 of the metal plate 80 by fastening members 111.

[0135] The bus bar 42 of the subunit SUY is an example of a "second bus bar." The base plate 41 of the subunit SUY is an example of a "second base member." The planar portion 51 of the subunit SUY is an example of a "second planar portion." The first surface 51a of the planar portion 51 of the subunit SUY is an example of a "third surface." The second surface 51b of the planar portion 51 of the subunit SUY is an example of a "fourth surface." The upright plate portion 52a of the subunit SUY is an example of a "third portion." The horizontal plate portion 52b of the subunit SUY is an example of a "fourth portion."

[0136] 24 is a cross-sectional view showing the function of the absorption structure. Here, the linear expansion coefficient of base plate 41, which is made of synthetic resin, is greater than that of metal plate 80, which is made of metal. Therefore, during thermal expansion, base plate 41 tends to expand more than metal plate 80. On the other hand, during thermal contraction, base plate 41 tends to contract more than metal plate 80.

[0137] In this embodiment, the fixing portion 52 of the base plate 41 has an upright plate portion 52a. With such upright plate portion 52a, during thermal expansion, the upright plate portion 52a bends in the X direction, thereby preventing a large load from being applied to the flat portion 51 and / or the fixing portion 52 of the base plate 41. Similarly, during thermal contraction, the upright plate portion 52a bends in the X direction, thereby preventing a large load from being applied to the flat portion 51 and / or the fixing portion 52 of the base plate 41.

[0138] 10. Fixed structures associated with multiple subunits Next, a fixing structure related to the plurality of subunits SU will be described with reference back to Fig. 11. In this embodiment, the main body MU is divided into a plurality of subunits SU (for example, three subunits SUX, SUY, and SUZ).

[0139] The subunit SUX includes a plurality of electronic components 10X, a base plate 41, and a plurality of bus bars 42. The plurality of bus bars 42 include portions that are arranged on the same plane as one another and are electrically connected to the plurality of electronic components 10X. The subunit SUX is an example of a "first subunit." The electronic components 10X are an example of a "first electronic component." The base plate 41 of the subunit SUX is an example of a "first base member." The planar portion 51 of the base plate 41 of the subunit SUX is an example of a "first planar portion."

[0140] The subunit SUY includes a plurality of electronic components 10Y, a base plate 41, and a plurality of bus bars 42. The plurality of bus bars 42 include portions that are arranged on the same plane as one another and are electrically connected to the plurality of electronic components 10Y. The subunit SUY is electrically connected to the subunit SUX, for example, via a connecting bus bar 75. The subunit SUY is an example of a "second subunit." The electronic components 10Y are an example of a "second electronic component." The base plate 41 of the subunit SUY is an example of a "second base member." The planar portion 51 of the base plate 41 of the subunit SUY is an example of a "second planar portion."

[0141] The subunit SUZ includes a plurality of electronic components 10Z, a base plate 41, and a plurality of bus bars 42. The plurality of bus bars 42 include portions that are arranged on the same plane as one another and are electrically connected to the plurality of electronic components 10Z. The subunit SUZ is electrically connected to the subunit SUY, for example, via a plurality of connecting bus bars 75. The subunit SUZ is an example of a "third subunit." The electronic components 10Z are an example of a "third electronic component." The base plate 41 of the subunit SUZ is an example of a "third base member." The planar portion 51 of the base plate 41 of the subunit SUZ is an example of a "third planar portion."

[0142] In this embodiment, the plurality of subunits SU (for example, three subunits SUX, SUY, and SUZ) are each fixed to a metal plate 80. As a result, the plurality of subunits SU (for example, three subunits SUX, SUY, and SUZ) are held together by the single metal plate 80.

[0143] In this embodiment, the longitudinal direction of the subunit SUX is the X direction. The longitudinal direction of the subunit SUY is the X direction. The longitudinal direction of the subunit SUZ is the X direction. Multiple subunits SU (e.g., three subunits SUX, SUY, and SUZ) are adjacent to each other in the X direction and are aligned in a row in the X direction. The longitudinal direction of the metal plate 80 is the X direction. The length of the metal plate 80 in the X direction is greater than the total length of the multiple subunits SU (e.g., three subunits SUX, SUY, and SUZ) in the X direction.

[0144] In this embodiment, the fixing portion 52 of the subunit SUX and the fixing portion 52 of the subunit SUY are arranged in positions that overlap in the Z direction. The fixing portion 52 of the subunit SUX and the fixing portion 52 of the subunit SUY are fixed together to the fixing portion 82 of the metal plate 80 by one fastening member 111. The fixing portion 52 of the subunit SUX is an example of a "first fixing portion." The fixing portion 52 of the subunit SUY is an example of a "second fixing portion."

[0145] Similarly, the fixing portion 52 of the subunit SUY and the fixing portion 52 of the subunit SUZ are arranged in positions where they overlap in the Z direction. The fixing portion 52 of the subunit SUY and the fixing portion 52 of the subunit SUZ are fixed together to the fixing portion 82 of the metal plate 80 by one fastening member 111.

[0146] In this embodiment, heat generated by electronic component 10X and bus bar 42 included in subunit SUX is conducted to metal plate 80 via one or more heat transfer members 92 facing subunit SUX. Similarly, heat generated by electronic component 10Y and bus bar 42 included in subunit SUY is conducted to metal plate 80 via one or more heat transfer members 92 facing subunit SUY. Heat generated by electronic component 10Z and bus bar 42 included in subunit SUZ is conducted to metal plate 80 via one or more heat transfer members 92 facing subunit SUZ.

[0147] In this embodiment, the multiple subunits SU (for example, three subunits SUX, SUY, and SUZ) may have different amounts of heat generated. Even when the multiple subunits SU have different amounts of heat generated, a single large metal plate 80 can be used to promote cooling of the multiple subunits SU (for example, three subunits SUX, SUY, and SUZ). For example, when the multiple subunits SU have different amounts of heat generated, a single large metal plate 80 can be used to uniformly heat the multiple subunits SU.

[0148] <11. Structure of insulating ribs> Next, the structure of the insulating rib 53 will be described.

[0149] <11.1 First embodiment of insulating rib> FIG. 25 is a perspective view illustrating a first mode of the insulating rib 53. In this embodiment, the base plate 41 has the insulating rib 53. The insulating rib 53 is a rib that stands up in the +Z direction from the first surface 51a of the flat portion 51. The insulating rib 53 is made of synthetic resin and has insulating properties. The insulating rib 53 is provided, for example, as a part of the base plate 41. The insulating rib 53 is arranged between two bus bars 42 that are arranged side by side with their upper surfaces (first surface 51a sides) exposed, and ensures an insulating distance between the two bus bars 42. In this embodiment, the first surface 51a is an example of the "first surface." The second surface 51b is an example of the "second surface."

[0150] In this embodiment, wiring board 40 has bus bar 42J and bus bar 42K as the plurality of bus bars 42. Furthermore, base plate 41 has housing portion 55J and housing portion 55K as the plurality of housing portions 55.

[0151] At least a portion of busbar 42J is housed in housing portion 55J and extends along flat portion 51. Busbar 42J is electrically connected to terminal 13A of one electronic component 10 (hereinafter sometimes referred to as "first electronic component 10") via connecting part 20. Busbar 42J is an example of a "first busbar." Housing portion 55J is an example of a "first housing portion."

[0152] At least a portion of busbar 42K is accommodated in accommodation portion 55K and extends along flat portion 51. Busbar 42K is electrically connected to terminal 13 of another electronic component 10 (second electronic component) via another connection component 20. Alternatively, busbar 42J may be electrically connected to terminal 13B of first electronic component 10 via the other connection component 20. Busbar 42K is an example of a "second busbar." Accommodation portion 55K is an example of a "second accommodation portion."

[0153] In this embodiment, the insulating rib 53 protrudes in the +Z direction from the first surface 51a at a position between the accommodation portion 55J and the accommodation portion 55K. The insulating rib 53 is an example of an "insulating wall" and an example of a "first rib."

[0154] In this embodiment, the busbar 42J is accommodated in the accommodation portion 55J while exposed on the upper surface side (the first surface 51a side) and includes a first straight portion 42Ja extending linearly in, for example, the X direction. The busbar 42K is accommodated in the accommodation portion 55K while exposed on the upper surface side (the first surface 51a side) and includes a second straight portion 42Ka extending linearly in, for example, the X direction. The first straight portion 42Ja of the busbar 42J and the second straight portion 42Ka of the busbar 42K are adjacent to each other in, for example, the Y direction. The second straight portion 42Ka of the busbar 42K extends parallel to the first straight portion 42Ja of the busbar 42J.

[0155] When viewed from the Z direction, the insulating rib 53 is located between the first straight portion 42Ja of the bus bar 42J and the second straight portion 42Ka of the bus bar 42K, and extends parallel to the first straight portion 42Ja of the bus bar 42J and the second straight portion 42Ka of the bus bar 42K. The first straight portion 42Ja of the bus bar 42J, the second straight portion 42Ka of the bus bar 42K, and the insulating rib 53 may extend linearly in the Y direction instead of the X direction.

[0156] In the present embodiment, the subunit SU has a connection part 30C and a connection part 30D as the multiple connection parts 30. The connection part 30C is adjacent to the bus bar 42J in the Z direction and is connected to the bus bar 42J from the Z direction. The connection part 30C is electrically connected to a first external device via an external connection bus bar 76. The connection part 30D is adjacent to the bus bar 42K in the Z direction and is connected to the bus bar 42K from the Z direction. The connection part 30D is electrically connected to the first external device or the second external device via another external connection bus bar 76. In the present embodiment, a portion of the insulating rib 53 is disposed between the connection part 30C (first connection part) and the connection part 30D (second connection part) and electrically insulates the connection part 30C (first connection part) from the connection part 30D (second connection part).

[0157] The first connecting part is not limited to the connecting part 30, but may be a connecting part 20 connected to another electronic part 10 (third electronic part) included in the same sub-unit SU. Similarly, the second connecting part is not limited to the connecting part 30, but may be a connecting part 20 connected to another electronic part 10 (fourth electronic part) included in the same sub-unit SU.

[0158] (First Modification) FIG. 26 is a perspective view illustrating a first modified example of the first aspect of the insulating rib 53. In this modified example, the insulating rib 53 is a rib that stands in the -Z direction from the second surface 51b of the flat portion 51. The insulating rib 53 is provided, for example, as part of the base plate 41. The insulating rib 53 is arranged between two bus bars 42 that are arranged side by side with their lower surfaces (second surface 51b sides) exposed, and ensures an insulating distance between the two bus bars 42. In this modified example, the second surface 51b is an example of a "first surface." The first surface 51a is an example of a "second surface." The insulating rib 53 is an example of an "insulating wall."

[0159] In this modification, bus bar 42J is accommodated in accommodation portion 55J with its lower surface (second surface 51b side) exposed, and includes, for example, a first straight portion 42Ja extending linearly in the X direction. Bus bar 42K is accommodated in accommodation portion 55K with its lower surface (second surface 51b side) exposed, and includes, for example, a second straight portion 42Ka extending linearly in the X direction. When viewed from the Z direction, insulating rib 53 is located between the first straight portion 42Ja of bus bar 42J and the second straight portion 42Ka of bus bar 42K, and extends parallel to the first straight portion 42Ja of bus bar 42J and the second straight portion 42Ka of bus bar 42K.

[0160] (Second Modification) 27 is a cross-sectional view illustrating a second modified example of the first aspect of the insulating wall. In this modified example, an insulating wall 53A is provided between the second surface 51b of the flat portion 51 of the base plate 41 and the flat portion 81 of the metal plate 80. The insulating wall 53A is provided on the second surface 51b of the flat portion 51. In this modified example, the second surface 51b is an example of the "first surface." The first surface 51a is an example of the "second surface." In this disclosure, "provided on a surface" is not limited to being formed integrally with a member that includes the surface, but may also include being formed as a separate body and then disposed in contact with the surface, thereby being present in relation to the surface.

[0161] In this modification, the insulating wall 53A extends in the Z direction across, for example, the second surface 51b of the flat portion 51 of the base plate 41 and the flat portion 81 of the metal plate 80. The insulating wall 53A is made of synthetic resin and has insulating properties. The insulating wall 53A is formed, for example, by compressing an elastic insulating member between the base plate 41 and the metal plate 80. Similar to the insulating rib 53 of the first modification, the insulating wall 53A is disposed between two bus bars 42 that are arranged side by side with their lower surfaces exposed, and ensures an insulating distance between the two bus bars 42. The other configuration of the insulating wall 53A is similar to that of the insulating rib 53 of the first modification.

[0162] <11.2 Second mode of insulating rib> FIG. 28 is a perspective view illustrating a second mode of insulating rib 53. In this embodiment, subunit SU has a plurality of connection parts 20, including connection part 20G and connection part 20H. Connection part 20G is connected to terminal 13A of electronic component 10. Connection part 20G is adjacent to bus bar 42J in the Z direction and is connected to bus bar 42J from the Z direction. Connection part 20H is connected to terminal 13B of electronic component 10. Connection part 20H is adjacent to bus bar 42K in the Z direction and is connected to bus bar 42K from the Z direction. In this embodiment, a portion of insulating rib 53 is disposed between connection part 20G (first connection part) and connection part 20H (second connection part) to electrically insulate connection part 20G (first connection part) from connection part 20H (second connection part).

[0163] In this embodiment, the electronic component 10 has the insulating rib 11a described above. The insulating rib 11a is an example of a "rib" and an example of a "second rib." In this embodiment, the insulating rib 53 provided on the base plate 41 and the insulating rib 11a of the electronic component 10 are connected. As a result, the insulating rib 11a of the electronic component 10 and the insulating rib 53 form a continuous insulating rib.

[0164] In this embodiment, the insulating rib 53 provided on the base plate 41 has an engaging portion 56 that engages with the insulating rib 11a of the electronic component 10. The engaging portion 56 has, for example, a recess 56a. The recess 56a is recessed in the protruding direction of the insulating rib 11a (X direction) and extends in the Z direction. The recess 56a is open in the +Z direction. The insulating rib 11a of the electronic component 10 can be inserted into the recess 56a along the Z direction. Furthermore, the electronic component 10 can move in the Z direction with the insulating rib 11a inserted into the recess 56a and guided by the recess 56a. The electronic component 10 is positioned in the X and Y directions by inserting the insulating rib 11a into the recess 56a.

[0165] <12. Structure of connecting parts> Next, the structure of the connection part 20 will be described. FIG. 29 is a cross-sectional view illustrating the structure of the connection part 20. In this embodiment, the connection part 20 (e.g., connection part 20M and connection part 20N) is a heat storage member (heat absorption member) that increases the heat capacity of the current path of the electrical connection unit 1. The connection part 20 stores (absorbs) at least a portion of the heat generated by the electronic component 10, for example. Alternatively / in addition to this, the connection part 20 may store (absorb) at least a portion of the heat generated by the bus bar 42 itself when current is applied. The connection part 20 may also be referred to as a "heat storage part" or a "heat absorption part."

[0166] In this embodiment, the bus bar 42 is disposed at a position away from the terminal 13 of the electronic component 10 (for example, at a position away in the Z direction). The connection component 20 is disposed between the electronic component 10 and the bus bar 42. In the present disclosure, "the connection component is disposed between the electronic component and the bus bar" is not limited to the case where a part of the connection component is located between the electronic component and the bus bar when viewed from the X direction or the Y direction. "The connection component is disposed between the electronic component and the bus bar" may also apply to the case where a part of the connection component is located between the electronic component and the bus bar when viewed from a direction oblique to the X direction or the Y direction. The connection component 20 electrically connects the terminal 13 of the electronic component 10 and the bus bar 42.

[0167] In this embodiment, the thickness of at least a portion of the connection part 20 is greater than the thickness (thickness in the Z direction) T3 of the bus bar 42. For example, the thickness T1 in the X direction of at least a portion of the connection part 20 is greater than the thickness T3 of the bus bar 42. In this embodiment, the thickness T1 in the X direction of the first portion 21 of the connection part 20 is greater than the thickness T3 of the bus bar 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 bus bar 42 over the entire length of the first portion 21 in the Z direction. The thickness T1 in the X direction of the first portion 21 of the connection part 20 is, for example, at least twice the thickness T3 of the bus bar 42. From another perspective, the thickness T2 in the Z direction of the second portion 22 of the connection part 20 may be greater than the thickness T3 of the bus bar 42.

[0168] In this embodiment, the thickness T1 in the X direction of the first portion 21 of the connecting part 20 is greater than the thickness T2 in the Z direction of the second portion 22 of the connecting part 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 over the entire length of the first portion 21 in the Z direction.

[0169] The above-described dimensional relationships also apply to the connection component 30 to which the external connection bus bar 76 is connected and / or the connection component 100 to which the coupling bus bar 75 is connected. For example, in the description of the connection component 30, in the description of the connection component 20 described above, "connection component 20" can be read as "connection component 30," "first portion 21" can be read as "first portion 31," and "second portion 22" can be read as "second portion 32." Similarly, in the description of the connection component 100, in the description of the connection component 20 described above, "connection component 20" can be read as "connection component 100," "first portion 21" can be read as "first portion 101," and "second portion 22" can be read as "second portion 102."

[0170] <13. Electrical Connection Unit Manufacturing Method> Next, a method for manufacturing the electrical connection unit 1 will be described. 30 to 34 are cross-sectional views illustrating a manufacturing method of the electrical connection unit 1. In the wiring board 40 of each subunit SU, the base plate 41 and the multiple bus bars 42 are integrated by insert molding or another method, with the fastening members 43 fixed to the bus bars 42. In this way, the wiring board 40 of each subunit SU is prepared in advance.

[0171] (1st step) 30 shows the first step. In the first step, the connecting component 20 is fixed to the terminal 13 of the electronic component 10 using the fastening member 71 or the fastening member 72. This forms an assembly SA in which the electronic component 10 and the connecting component 20 are integrated together.

[0172] The first step for electronic component 10M is performed, for example, as follows: First, electronic component 10M is placed on mounting base MP with mounting holes 13h of terminals 13 of electronic component 10M facing vertically. Next, connecting component 20M is placed on electronic component 10M with first mounting holes 21h of connecting component 20M facing vertically. Then, first mounting holes 21h of connecting component 20M are aligned with mounting holes 13h of terminals 13 of electronic component 10M. The first step is performed with electronic component 10M and connecting component 20M in a first position. In the first position, mounting holes 13h and first mounting holes 21h face vertically.

[0173] Next, fastening member 71 is inserted vertically into first mounting hole 21h of connecting part 20M. Then, fastening member 71 that has passed through mounting hole 21h of connecting part 20M engages with mounting hole 13h of terminal 13 of electronic component 10. This forms assembly SA in which electronic component 10M and connecting part 20M are integrated. The vertical direction is an example of a "first mounting direction."

[0174] (2nd process) 31 shows the second step. In the second step, the assembly SA is fixed to the wiring board 40 of each subunit SU. For example, the connection component 20 included in the assembly SA is fixed to the bus bar 42 included in the wiring board 40. This electrically connects the electronic component 10 and the bus bar 42.

[0175] The second step is performed, for example, as follows. As described above, in the wiring board 40, the fastening members 43 are fixed to the busbars 42. The fastening members 43 protrude vertically from the busbars 42. Then, the assembly SA is placed on the wiring board 40 so that the fastening members 43 are inserted vertically into the second mounting holes 22h of the second portions 22 of the connection components 20. Next, an engaging member 44 (e.g., a nut) is engaged with the upper end of the fastening members 43 from the vertical direction. This fixes the second portions 22 of the connection components 20 included in the assembly SA to the busbars 42. This completes each subunit SU.

[0176] Here, the second step for electronic component 10M is performed, for example, as follows: First, the posture of assembly SA is rotated 90 degrees from that in the first step. That is, the posture is changed from a first posture (see FIG. 30) in which mounting hole 13h and first mounting hole 21h are oriented vertically to a second posture (see FIG. 31) in which mounting hole 13h and first mounting hole 21h are oriented horizontally and second mounting hole 22h of connecting component 20 is oriented vertically.

[0177] Then, in the second posture, the assembly SA is placed on the wiring board 40 by inserting the fastening member 43 vertically into the second mounting hole 22h of the second portion 22 of the connection part 20. Next, the engaging member 44 (e.g., a nut) is engaged with the upper end of the fastening member 43 from the vertical direction. This fixes the second portion 22 of the connection part 20M included in the assembly SA to the bus bar 42.

[0178] (3rd step) 32 shows the third step. In the third step, each subunit SU is attached to the metal plate 80. The third step is performed, for example, as follows. First, an insulating sheet 91 is attached to the surface of the flat portion 81 of the metal plate 80. Next, a heat transfer member 92 is fixed to the underside of each subunit SU using an adhesive or the like. Next, each subunit SU is placed on the metal plate 80 with the insulating sheet 91 and the heat transfer member 92 interposed therebetween. Then, the fixing portion 52 of each subunit SU is fixed to the fixing portion 82 of the metal plate 80 using fastening members 111.

[0179] (4th step) 33 shows the fourth step, in which the mounting portions 14 of the electronic components 10 of each subunit SU are fixed to the fixing portions 83 of the metal plate 80 by fastening members 112. Note that the fourth step may be performed together with the third step.

[0180] (5th step) 34 shows the fifth step, in which the insulating cover 93 is attached to the metal plate 80 in the vertical direction. This completes the electrical connection unit 1.

[0181] In addition, the assembly SA may be an assembly in which the connection bus bar 75 and the connection component 100 are integrated, or an assembly in which the external connection bus bar 76 and the connection component 30 are integrated, instead of / in addition to the assembly in which the electronic component 10 and the connection component 20 are integrated. Each of the electronic component 10, the connection bus bar 75, and the external connection bus bar 76 is an example of a "component to be connected". Therefore, the "electronic component 10" in the above description may be read as the "connection bus bar 75" or the "external connection bus bar 76". Also, the "connection component 20" in the above description may be read as the "connection component 100" or the "connection component 30".

[0182] <14. Advantages> <A. Advantages regarding the wiring board> As a comparative example, consider an electrical connection unit in which a bus bar is arranged in a standing posture with respect to the lower wall of the housing. In the configuration of such a comparative example, for example, since the cross-sectional area of the bus bar is determined to perform the function as a wiring material, it may be difficult to reduce the width (height) of the standing bus bar. In this case, the width of the standing bus bar becomes a bottleneck, and it may be difficult to reduce the height of the electrical connection unit.

[0183] On the other hand, in the present embodiment, the electrical connection unit 1 includes the first electronic component 10 and the wiring board 40. The wiring board 40 includes a base plate 41 and a first bus bar 42. The base plate 41 has a plate-shaped flat portion 51 having a first surface area 51a facing the first electronic component 10. The flat portion 51 has a first accommodating portion 55 that is recessed in the Z direction or penetrates the flat portion 51 in the Z direction. At least a part of the first bus bar 42 is accommodated in the first accommodating portion 55 and extends along the flat portion 51. According to such a configuration, at least a part of the wiring path is formed on a plane, and compared with the structure of the above comparative example, the width of the bus bar is less likely to become a bottleneck, and it becomes easier to reduce the height of the electrical connection unit 1.

[0184] In this embodiment, the electrical connection unit 1 has a first connection component 20. The first connection component 20 electrically connects the first electronic component 10 and a first bus bar 42. The first bus bar 42 has a first connection portion 61 that contacts the first connection component 20. The first connection portion 61 is housed in the first housing portion 55 and extends along the planar portion 51. With this configuration, a larger portion of the wiring path is formed on a flat surface, making it easier to reduce the height of the electrical connection unit 1.

[0185] In this embodiment, the electrical connection unit 1 has a second connection component 20. The second connection component 20 electrically connects a second electronic component or an external device to a first bus bar 42. The first bus bar 42 has a second connection portion 62 that contacts the second connection component 20. The first bus bar 42 is housed in the first housing portion 55 across at least the first connection portion 61 and the second connection portion 62 and extends along the flat portion 51. With this configuration, a larger portion of the wiring path is formed on a flat surface, making it easier to reduce the height of the electrical connection unit 1.

[0186] In this embodiment, the first bus bar 42 has an extension portion 63 between the first connection portion 61 and the second connection portion 62. The extension portion 63 is accommodated in the first housing portion 55 and extends through the region R that overlaps with the electronic component 10 when viewed from the Z direction, so as to span both sides of the region R. With this configuration, since the extension portion 63 is accommodated in the first housing portion 55, the presence of the electronic component 10 is less likely to restrict the wiring layout. This enables a wiring layout that provides more advantageous electrical characteristics, such as making it easier to extend the extension portion 63 linearly. Furthermore, it is possible to avoid routing the bus bar in a way that bypasses the electronic component 10. This improves the electrical characteristics of the electrical connection unit 1 and / or reduces the size of the electrical connection unit 1.

[0187] In this embodiment, when viewed from the Z direction, the first bus bar 42 has an extension 64 that extends to the region R that overlaps with the first electronic component 10 and has an end 42e1 at a position that overlaps with the first electronic component 10. The extension 64 is housed in the first housing portion 55 and extends along the flat portion 51. With this configuration, housing the extension 64 in the first housing portion 55 makes it possible to reduce the height of the electrical connection unit 1 while disposing a metallic heat dissipation portion (extension 64) below the first electronic component 10 to promote heat dissipation and / or heat storage of the first electronic component 10. This makes it possible to reduce the height of the electrical connection unit 1 while improving the heat dissipation and / or heat storage properties of the electrical connection unit 1.

[0188] In this embodiment, the first bus bar 42 is accommodated in the first accommodating portion 55 over the entire length of the first bus bar 42 and extends along the flat portion 51. With this configuration, a larger portion of the wiring path is formed on a flat surface, making it easier to reduce the height of the electrical connection unit 1.

[0189] In this embodiment, the electrical connection unit 1 has a second bus bar 42 electrically connected to the second terminal 13B of the first electronic component 10. The flat portion 51 has a second accommodating portion 55 that is recessed in the Z direction or that penetrates the flat portion 51 in the Z direction, at a position away from the first accommodating portion 55. At least a portion of the second bus bar 42 is accommodated in the second accommodating portion 55 and extends along the flat portion 51. With this configuration, a larger portion of the wiring path including the multiple bus bars 42 is held flat by the single base plate 41, further facilitating the reduction in height of the electrical connection unit 1.

[0190] In this embodiment, the electrical connection unit 1 has a third bus bar 42. The first bus bar 42 is a bus bar included in the positive electrode line PL. The third bus bar 42 is a bus bar included in the negative electrode line NL. The flat portion 51 has a third housing portion 55 that is recessed in the Z direction or that penetrates the flat portion 51 in the Z direction, at a position away from the first housing portion 55. At least a portion of the third bus bar 42 is housed in the third housing portion 55 and extends along the flat portion 51. With this configuration, a larger portion of the wiring paths that form the positive electrode lines PL and the negative electrode lines NL is held flat by a single base plate 41, making it easier to reduce the height of the electrical connection unit 1.

[0191] In this embodiment, the electrical connection unit 1 includes a fourth bus bar 42, a fifth bus bar 42, and a third connection component 100 that electrically connects the fourth bus bar 42 and the fifth bus bar 42. The flat portion 51 includes a fourth housing portion 55 that is recessed in the Z direction or penetrates the flat portion 51 in the Z direction, located at a position away from the first housing portion 55. At least a portion of the fourth bus bar 42 is housed in the fourth housing portion 55 and extends along the flat portion 51. The third connection component 100 includes a portion that stands upright relative to the fourth bus bar 42. The fifth bus bar 42 is supported by the third connection component 100 at a position away from the first bus bar 42 in the Z direction and extends parallel to the first surface 51a. This configuration facilitates the formation of a three-dimensional wiring path using the fourth bus bar 42, the third connection component 100, and the fifth bus bar 42. This allows the electrical connection unit 1 to be easily assembled. Furthermore, by arranging the fourth bus bar 42 in the receiving portion 55 of the base plate 41, a part of the three-dimensional wiring path is formed within the thickness of the base plate 41. This makes it even easier to reduce the height of the electrical connection unit 1.

[0192] In the present embodiment, the fifth bus bar 42 extends so as to straddle the first bus bar 42 at a position away from the first bus bar 42 in the Z direction. According to such a configuration, it is easy to form a wiring path that is three-dimensionally crossed with the first bus bar 42 by the third connecting component 100 and the fifth bus bar 42. Thereby, the electrical connection unit 1 excellent in assemblability can be provided.

[0193] <B. Advantages Regarding Flat Bus Bars> As a comparative example, consider an electrical connection unit in which a bus bar is arranged in a standing posture with respect to the lower wall of the housing. In the configuration of such a comparative example, it is necessary to fix the bus bar to the housing in a standing posture, and it is difficult to improve the workability regarding the attachment of the bus bar. In this case, it may be difficult to improve the assemblability of the electrical connection unit 1.

[0194] On the other hand, in the present embodiment, the electrical connection unit 1 has a base plate 41 and a bus bar 42. The base plate 41 includes a plate-shaped flat portion 51. The flat portion 51 has a first accommodating portion 55 that is recessed in the Z direction or penetrates the flat portion 51 in the Z direction. At least a part of the bus bar 42 is accommodated in the first accommodating portion 55 and extends along the flat portion 51. According to such a configuration, it becomes easy to handle the base plate 41 and the bus bar 42 integrally, and the workability regarding the attachment of the bus bar can be improved as compared with the configuration of the above comparative example. Thereby, the assemblability of the electrical connection unit 1 can be improved.

[0195] In the present embodiment, the bus bar 42 is accommodated in the accommodating portion 55 over the entire length of the bus bar 42 and extends along the flat portion 51. According to such a configuration, while improving the assemblability of the electrical connection unit 1, it becomes easy to reduce the height of the electrical connection unit 1.

[0196] In this embodiment, the bus bar 42 is integrated with the base plate 41 by insert molding. According to such a configuration, the operation of manually attaching the bus bar 42 to the housing can be eliminated or reduced. Thereby, further improvement in the assemblability of the electrical connection unit 1 can be achieved.

[0197] In this embodiment, it has a fastening member 43 protruding in the Z direction from the bus bar 42, and connection components 20 and 30 attached to the fastening member 43 from the Z direction. The connection components 20 and 30 electrically connect the electronic component 10 or the external device to the bus bar 42. According to such a configuration, it becomes easier to align the direction of the operation of attaching the connection target component to the bus bar 42 in the Z direction. If the direction of the operation can be aligned, further improvement in the assemblability of the electrical connection unit 1 can be achieved.

[0198] In this embodiment, the connection component 20 is connected to the electronic component 10 from the X direction (or Y direction). According to such a configuration, for the electronic component 10 that requires connection from the X direction, by using the connection component 20, the connection direction of the electronic component 10 with respect to the bus bar 42 can be converted to the Z direction. Thereby, further improvement in the assemblability of the electrical connection unit 1 can be achieved.

[0199] <C. Advantages Regarding the Exposed Structure on the Upper Surface Side of the Bus Bar> As a comparative example, consider an electrical connection unit in which the upper surface side of the bus bar 42 is covered with a synthetic resin. In such a configuration of the comparative example, it may be difficult to improve the heat dissipation of the electrical connection unit.

[0200] On the other hand, in this embodiment, the electrical connection unit 1 includes a first electronic component 10, a base plate 41, and a bus bar 42. The base plate 41 includes a plate-shaped flat portion 51 having a first surface 51a facing the first electronic component 10 and a second surface 51b located on the opposite side of the first surface 51a. The flat portion 51 includes a housing portion 55 recessed in the Z direction or penetrating the flat portion 51 in the Z direction. At least a portion of the bus bar 42 includes a plate portion 42p housed in the housing portion 55 and extending along the flat portion 51. The plate portion 42p includes a first connection portion 61 overlapping the first connecting component 20 when viewed in the Z direction, and an extension portion 63 extending from the first connection portion 61 in a direction intersecting the Z direction. At least a portion of the extension portion 63 is exposed to the outside of the base plate 41 on the side of the first surface 51a. With this configuration, at least a portion of the bus bar 42 other than the connection portions 61, 62 that are connected to other components is exposed to the outside of the base plate 41 and functions as an area that dissipates heat. In this case, the heat dissipation performance of the electrical connection unit 1 can be improved.

[0201] In this embodiment, the extension 63 is exposed to the outside of the base plate 41 on the first surface 51a side in at least a part of the region R that overlaps with the first electronic component 10 when viewed from the Z direction. This configuration makes it easier for the part of the extension 63 to function as a heat dissipation part that transfers heat from the first electronic component 10. In this case, the heat dissipation performance of the electrical connection unit 1 can be improved.

[0202] In this embodiment, the first bus bar 42 has a second connection portion 62 that overlaps with the second connection components 20, 30 when viewed in the Z direction. The first bus bar 42 is housed in the housing portion 55 and extends along the flat portion 51 over at least the entire length between the first connection portion 61 and the second connection portion 62, and is exposed to the outside of the base plate 41 on the first surface 51a side. With this configuration, a wider portion functions as a heat dissipation area, thereby further improving the heat dissipation performance of the electrical connection unit 1.

[0203] In the present embodiment, the bus bar 42 is housed in the housing portion 55 over the entire length of the bus bar 42, extends along the flat portion 51, and is exposed outside the base plate 41 on the side of the first surface 51a. According to such a configuration, a wider portion functions as a heat dissipation area, so that the heat dissipation performance of the electrical connection unit 1 can be further improved.

[0204] At least a part of the extension portion 63 is exposed outside the base plate 41 not only on the side of the first surface 51a but also on the side of the second surface 51b. According to such a configuration, a wider portion functions as a heat dissipation area, so that the heat dissipation performance of the electrical connection unit 1 can be further improved.

[0205] In a modification of the present embodiment, the electrical connection unit 1 includes a metal plate 80 facing the flat portion 51 with a gap S1 therebetween, and a heat transfer member 92 disposed between the bus bar 42 and the metal plate 80. The base plate 41 has a cover portion 51v that covers at least a part of the extension portion 63 on the side of the second surface 51b. According to such a configuration, even when heat is likely to accumulate in the gap S1 between the base plate 41 and the metal plate 80, the provision of the cover portion 51v can suppress the likelihood of heat accumulation in the gap S1.

[0206] <D. Advantages Regarding the Exposed Structure on the Lower Surface Side of the Bus Bar> As a comparative example, consider an electrical connection unit in which the lower surface side of the bus bar 42 is covered with a synthetic resin. In such a configuration of the comparative example, it may be difficult to improve the heat dissipation performance of the electrical connection unit.

[0207] On the other hand, in this embodiment, the electrical connection unit 1 includes a first electronic component 10, a base plate 41, and a bus bar 42. The base plate 41 has a plate-shaped flat portion 51 having a first surface 51a facing the first electronic component 10 and a second surface 51b located on the opposite side of the first surface 51a. The flat portion 51 has an accommodation portion 55 that is recessed in the Z direction or penetrates the flat portion 51 in the Z direction. At least a portion of the bus bar 42 has a plate portion 42p that is accommodated in the accommodation portion 55 and extends along the flat portion 51. The plate portion 42p includes an exposed portion 42u that is exposed to the outside of the base plate 41 on the second surface 51b side. With this configuration, at least a portion of the plate portion 42p of the bus bar 42 is exposed to the outside of the base plate 41 and functions as an area for dissipating heat. This improves the heat dissipation performance of the electrical connection unit 1. From this viewpoint, the heat transfer member 92 does not necessarily have to be in contact with the exposed portion 42u.

[0208] In this embodiment, at least a portion of the exposed portion 42u of the bus bar 42 is disposed in a region that overlaps with the connection component 20 when viewed from the Z direction. This configuration makes it easier for heat from the connection component 20 to be dissipated by the exposed portion 42u of the bus bar 42. This further improves the heat dissipation performance of the electrical connection unit 1.

[0209] In this embodiment, the electrical connection unit 1 further includes a metal plate 80 and a heat transfer member 92. The metal plate 80 faces the second surface 51b of the flat surface portion 51 with a gap S1 between it and the flat surface portion 51. The heat transfer member 92 is disposed between the exposed portion 42u of the bus bar 42 and the metal plate 80. With this configuration, heat from the bus bar 42 can be easily transferred to the metal plate 80 via the heat transfer member 92 and dissipated. This further improves the heat dissipation performance of the electrical connection unit 1.

[0210] In this embodiment, at least a portion of the exposed portion 42u of the bus bar 42 is disposed in a region that overlaps with the connection component 20 when viewed from the Z direction. At least a portion of the heat transfer member 92 overlaps with the exposed portion 42u of the bus bar 42 in a region that overlaps with the connection component 20 when viewed from the Z direction. This configuration makes it easier to transfer heat from the electronic component 10 to the metal plate 80 via the heat transfer member 92 and dissipate it. This further improves the heat dissipation performance of the electrical connection unit 1.

[0211] Alternatively or additionally to the above example, at least a portion of the heat transfer member 92 overlaps with the exposed portion 42u of the bus bar 42 in the region that overlaps with the connection part 30 when viewed from the Z direction. With this configuration, even when heat is received from an external device via the external connection bus bar 76, the received heat can be easily transferred and dissipated by the metal plate 80. This further improves the heat dissipation performance of the electrical connection unit 1.

[0212] In this embodiment, the exposed portion 42u of the busbar 42 includes a first portion 42ua arranged in a region overlapping the connection component 20 when viewed from the Z1 direction, and a second portion 42ub arranged in a region overlapping the first electronic component 10 when viewed from the Z direction. The heat transfer member 92 has a first heat transfer portion 92a overlapping the first portion 42ua of the exposed portion 42u when viewed from the Z direction, and a second heat transfer portion 92b overlapping the second portion 42ub of the exposed portion 42u when viewed from the Z direction. This configuration makes it easier to more efficiently transfer and dissipate heat from the first electronic component 10 to the metal plate 80 via the heat transfer member 92. This further improves the heat dissipation performance of the electrical connection unit 1.

[0213] In this embodiment, the second portion 42ub of the exposed portion 42u of the bus bar 42 is exposed to the outside of the base plate 41 not only on the second surface 51b side but also on the first surface 51a side, facing the first electronic component 10. This configuration makes it easier to efficiently transfer and dissipate heat from the first electronic component 10 to the metal plate 80 via the heat transfer member 92. This further improves the heat dissipation performance of the electrical connection unit 1.

[0214] In this embodiment, the bus bar 42 is accommodated in the accommodating portion 55 over the entire length thereof, extends along the flat portion 51, and is exposed outside the base plate 41 on the second surface 51b side. According to such a configuration, a wider portion functions as a heat dissipation area, so that the heat dissipation performance of the electrical connection unit 1 can be further improved.

[0215] <E. Advantages of the insulating wall> As a comparative example, consider an electrical connection unit in which no insulating wall is provided between adjacent bus bars in the vicinity within a predetermined distance. In such a configuration of the comparative example, in order to ensure the insulation distance between the bus bars, it is necessary to separate the bus bars by a predetermined distance or more. If it is necessary to separate the bus bars by a predetermined distance or more, it may be difficult to miniaturize the electrical connection unit.

[0216] On the other hand, in this embodiment, the base plate 41 has a first accommodating portion 55J, a second accommodating portion 55K, and an insulating wall (for example, an insulating rib 53 or an insulating wall 53A). The first accommodating portion 55J is recessed in the Z direction or penetrates the flat portion 51 in the Z direction, and accommodates at least a part of the first bus bar 42J in a state of being exposed to the first surface 51a side. The second accommodating portion 55K is recessed in the Z direction or penetrates the flat portion 51 in the Z direction, and is accommodated in a state where at least a part of the second bus bar 42 is exposed to the first surface 51a side. The insulating wall is provided on the first surface 51a at a position between the first accommodating portion 55J and the second accommodating portion 55K. According to such a configuration, even when the first accommodating portion 55J and the second accommodating portion 55K are arranged within a predetermined distance, the necessary insulation distance can be ensured by the insulating wall. Therefore, it becomes easy to arrange the plurality of bus bars 42 close to each other. When it becomes easy to arrange the plurality of bus bars 42 close to each other, the electrical connection unit 1 can be miniaturized.

[0217] Further, in this embodiment, the upward flow of the air heated by each bus bar 42 can be rectified by the insulating wall. Thereby, the heat dissipation performance of the electrical connection unit 1 can also be improved.

[0218] In this embodiment, the first bus bar 42J includes a first straight portion 42Ja that is housed in the first housing portion 55J and extends linearly while being exposed on the first surface 51a. The second bus bar 42K includes a second straight portion 42Ka that is housed in the second housing portion 55K and extends linearly parallel to the first straight portion 42Ja while being exposed on the first surface 51a. When viewed from the Z direction, the insulating wall is disposed between the first straight portion 42Ja and the second straight portion 42Ka and extends parallel to the first straight portion 42Ja and the second straight portion 42Ka. This configuration makes it easier to arrange the first straight portion 42Ja and the second straight portion 42Ka close to each other, facilitating further miniaturization of the electrical connection unit 1.

[0219] In this embodiment, the electrical connection unit 1 includes a first connection component (e.g., connection component 20 or connection component 30) and a second connection component (e.g., connection component 20 or connection component 30). The first connection component is connected to the first bus bar 42J and electrically connects the first bus bar 42J to a third electronic component or a first external device. The second connection component is connected to the second bus bar 42K and electrically connects the second bus bar 42K to a fourth electronic component, a first external device, or a second external device. A portion of the insulating wall is disposed between the first connection component and the second connection component. With this configuration, even when the first connection component and the second connection component are disposed within a predetermined distance, the insulating wall can ensure a necessary insulation distance between the first connection component and the second connection component. This makes it easier to arrange the first connection component and the second connection component close to each other. Easier arrangement of the first connection component and the second connection component close to each other facilitates further miniaturization of the electrical connection unit 1.

[0220] In this embodiment, the electrical connection unit 1 includes a first connection component (e.g., connection component 20) and a second connection component (e.g., connection component 20). The first connection component is attached to the first bus bar 42J and electrically connects the first bus bar 42J to the first terminal 13A of the first electronic component 10. The second connection component is attached to the second bus bar 42K and electrically connects the second bus bar 42K to the second terminal 13B of the first electronic component 10. A portion of the insulating wall is disposed between the first connection component and the second connection component. With this configuration, even when the first connection component and the second connection component connected to the same electronic component 10 are disposed within a predetermined distance, the insulating wall ensures a necessary insulation distance between the first connection component and the second connection component. This makes it easier to arrange the first connection component and the second connection component close to each other. Easier arrangement of the first connection component and the second connection component close to each other facilitates further miniaturization of the electrical connection unit 1.

[0221] In this embodiment, the first electronic component 10 has an insulating rib 11a located between the first terminal 13A and the second terminal 13B. The insulating rib 53 has an engaging portion 56 that engages with the insulating rib 11a of the first electronic component 10. With this configuration, the electronic component 10 can be aligned by engaging the insulating rib 11a of the electronic component 10 with the insulating rib 53. This improves the ease of assembly of the electrical connection unit 1. Furthermore, with this configuration, a continuous insulating wall can be formed by the insulating rib 53 and the insulating rib 11a of the first electronic component 10. This makes it easier to arrange multiple electrical paths close to each other within the electrical connection unit 1. Easier arrangement of multiple electrical paths close to each other makes it easier to further miniaturize the electrical connection unit 1.

[0222] In this embodiment, the engaging portion 56 of the insulating rib 53 has a recess 56a into which the insulating rib 11a of the electronic component 10 is inserted. With this configuration, the insulating rib 11a of the electronic component 10 is inserted into the recess 56a of the insulating rib 53, thereby facilitating the alignment of the electronic component 10. This further improves the ease of assembly of the electrical connection unit 1.

[0223] <Advantages Related to the Fixing Structure of Electronic Components> As a comparative example, consider the case where the mounting portion 14 of the electronic component 10 is fixed to the base plate 41. In the configuration of such a comparative example, since the base plate 41 is made of synthetic resin, it is difficult to ensure the rigidity around the mounting portion 14. Also, in the configuration of the comparative example, due to the linear expansion coefficient of the base plate 41 being larger than that of the electronic component 10, there is a possibility that the position of the electronic component 10 will move significantly during thermal expansion / contraction.

[0224] On the other hand, in the present embodiment, there are a base plate 41, a bus bar 42, a metal plate 80, and an electronic component 10. The base plate 41 has a plate-shaped planar portion 51 having a first surface 51a facing the first electronic component 10 and a second surface 51b located on the side opposite to the first surface 51a. The planar portion 51 has a housing portion 55 recessed in the Z direction or penetrating the planar portion 51 in the Z direction, and a through hole 51h penetrating the planar portion 51 in the Z direction. At least a part of the bus bar 42 is housed in the housing portion 55 and extends along the planar portion 51. The metal plate 80 has a plate-shaped planar portion 81 facing the second surface 51b, a first fixing portion 82 to which the base plate 41 is fixed, and a second fixing portion 83 protruding in the Z direction from the planar portion 81 and inserted into the through hole 51h. The electronic component 10 faces the first surface 51a, is electrically connected to the bus bar 42, and is fixed to the second fixing portion 83. According to such a configuration, the base plate 41 and the electronic component 10 are each fixed to the metal plate 80. In this case, since the metal plate 80 is made of metal, it becomes easier to ensure the rigidity around the mounting portion 14. Thereby, the durability of the electrical connection unit 1 can be improved. Also, in this configuration, since the linear expansion coefficient of the metal plate 80 is smaller than that of the base plate 41, it is possible to suppress the position of the electronic component 10 from moving significantly during thermal expansion / contraction.

[0225] In this embodiment, the second fixing portion 83 protrudes through the through hole 51h in the Z direction to a position at the same level as the first surface 51a or beyond the first surface 51a. The electronic component 10 is fixed to the second fixing portion 83 on the first surface 51a side. With this configuration, the second fixing portion 83 protrudes near the first surface 51a, making it easier to fix the electronic component 10 to the second fixing portion 83. This further improves the ease of assembly of the electrical connection unit 1. Furthermore, by protruding the second fixing portion 83 and inserting it into the through hole 51h, it becomes easier to arrange the base plate 41 closer to the metal plate 80. Making it easier to arrange the base plate 41 closer to the metal plate 80 makes it easier to reduce the height of the electrical connection unit 1.

[0226] In this embodiment, the first fixing portion 82 opens in the Z direction and has a first engagement hole 82h that engages with a first fastening member 111 that fixes the base plate 41 to the metal plate 80. The second fixing portion 83 opens in the Z direction and has a second engagement hole 83h that engages with a second fastening member 112 that fixes the electronic component 10 to the metal plate 80. With this configuration, the direction of the work to fix the base plate 41 to the first fixing portion 82 and the direction of the work to fix the electronic component 10 to the second fixing portion 83 can be aligned in the same direction. Having these work directions be the same further improves the ease of assembly of the electrical connection unit 1.

[0227] In this embodiment, the electrical connection unit 1 has a connection part 20 that electrically connects the electronic component 10 and the bus bar 42. The connection part 20 is fixed to the electronic component 10 and also to the bus bar 42. With this configuration, the electronic component 10 is fixed to the metal plate 80, and is also fixed to the bus bar 42 via the connection part 20. This makes it possible to further strengthen the fixing structure of the electronic component 10.

[0228] In this embodiment, the electrical connection unit 1 has a fastening member 43 protruding in the Z direction from the bus bar 42. The connecting component 20 is attached to the fastening member 43 from the Z direction and is connected to the bus bar 42. According to such a configuration, the working direction of the operation of fixing the base plate 41 to the first fixing portion 82, the working direction of the operation of fixing the electronic component 10 to the second fixing portion 83, and the working direction of the operation of fixing the connecting component 20 fixed to the electronic component 10 to the bus bar 42 can be aligned in the same direction. When these working directions are the same, further improvement in the assemblability of the electrical connection unit 1 can be achieved.

[0229] <Advantages regarding the convection generation structure> As a comparative example, when a metal plate 80 facing the second surface 51b of the flat portion 51 of the base plate 41 is provided, heat may accumulate in the gap S1 between the flat portion 51 of the base plate 41 and the metal plate 80. When heat accumulates in the gap S1, the heat dissipation performance of the electrical connection unit 1 may decrease.

[0230] On the other hand, in this embodiment, the electrical connection unit 1 includes a base plate 41, a bus bar 42, and a metal plate 80. The base plate 41 has a plate-shaped flat portion 51. The flat portion 51 has a housing portion 55 recessed in the Z direction or penetrating the flat portion 51 in the Z direction, and a through hole 51h penetrating the flat portion 51 in the Z direction. At least a part of the bus bar 42 is housed in the housing portion 55 and extends along the flat portion 51. The metal plate 80 has a flat portion 81 and a protruding portion (for example, the second fixing portion 83 or the protruding portion 84). The flat portion 81 is plate-shaped and faces the second surface 51b with a first gap S1 left between it and the second surface 51b. The protruding portion protrudes in the Z direction from the flat portion 81 and is inserted into the through hole 51h, leaving a second gap S2 through which air can pass between it and the inner peripheral surface 51ha of the through hole 51h. According to such a configuration, the air flows indicated by the arrows A1 to A3 described above occur, and the heat dissipation performance of the electrical connection unit 1 can be improved.

[0231] In this embodiment, the protruding portion protrudes in the Z direction through the through hole 51h to the same position as the first surface 51a or beyond the first surface 51a. According to such a configuration, the air flows indicated by the above-described arrows A1 to A3 are more likely to occur. Therefore, further improvement in the heat dissipation performance of the electrical connection unit 1 can be achieved.

[0232] In this embodiment, the protruding portion is the fixing portion 83 to which the electronic component 10 is fixed. According to such a configuration, the air flows indicated by the above-described arrows A1 to A3 are caused to occur more by utilizing the fixing portion 83 to which the electronic component 10 is fixed. Thereby, while achieving miniaturization, improvement in the heat dissipation performance of the electrical connection unit 1 can be achieved.

[0233] <H. Advantages regarding the protection structure related to thermal expansion / contraction> As a comparative example, consider a configuration having a fixing portion 52 without the upright plate portion 52a. In such a configuration of the comparative example, due to the expansion / contraction of the synthetic resin at high / low temperatures, a difference can occur in the length between the fixing positions of the base plate 41 and the metal plate 80, and there is a possibility that the vicinity of the fixing portion 52 of the base plate 41 may be damaged.

[0234] On the other hand, in this embodiment, the electrical connection unit 1 includes a metal plate 80, a first electronic component 10, a first bus bar 42, and a first base plate 41. The first base plate 41 includes a first flat portion 51, an upright plate portion 52a, and a horizontal plate portion 52b. The first flat portion 51 has a first surface 51a facing the electronic component 10 and a second surface 51b located opposite the first surface 51a and facing the metal plate 80, and is a plate-like portion that holds the first bus bar 42. The upright plate portion 52a is a plate-like portion that extends from the first flat portion 51 in the Z direction intersecting with the first surface 51a. The horizontal plate portion 52b is supported by the upright plate portion 52a and is positioned at a position different from the first surface 51a in the Z direction, and is fixed to the metal plate 80. With this configuration, thermal expansion / contraction of the base plate 41 can be absorbed by displacement of the first plate portion 52a. This reduces the possibility of breakage occurring near the fixing portion 52 of the base plate 41. This improves the durability of the electrical connection unit 1.

[0235] In this embodiment, the metal plate 80 has a flat portion 81 facing the second surface 51b of the flat portion 51, and a first fixing portion 82 that protrudes from the flat portion 81 in the Z direction and to which the horizontal plate portion 52b of the first base plate 41 is fixed. This configuration makes it easier to fix the horizontal plate portion 52b to the metal plate 80. Furthermore, the provision of the first plate portion 52a makes it easier to ensure insulation between the fixing portion 52 of the metal plate 80 and the bus bar 42.

[0236] In this embodiment, the first base plate 41 has a through hole 51h that penetrates the flat portion 51 in the Z direction. The metal plate 80 has a fixing portion 83 that protrudes from the flat portion 81 in the Z direction and is inserted into the through hole 51h of the first base plate 41 to fix the first electronic component 10. The length L1 of the standing plate portion 52a in the Z direction is greater than the length L2 of the fixing portion 83 in the Z direction. With this configuration, the presence of the large standing plate portion 52a makes it easier to absorb thermal expansion / contraction of the base plate 41.

[0237] In this embodiment, the electrical connection unit 1 further includes a second base plate 41. The second base plate 41 has a second flat portion 51, a standing plate portion 52a, and a horizontal plate portion 52b. The second flat portion 51 is a plate-shaped member that holds the second bus bar 42 and has a third surface 51a facing the second electronic component and a fourth surface 51b located on the opposite side of the third surface 51a and facing the metal plate 80. The second flat portion 51 is plate-shaped and extends from the second flat portion 51 in the Z direction. The horizontal plate portion 52b is supported by the standing plate portion 52a and is arranged at a position different from the first surface 51a in the Z direction. The horizontal plate portion 52b of the second base plate is overlapped with the horizontal plate portion 52b of the first base plate and fixed to the metal plate 80. According to such a configuration, the horizontal plate portions 52b of the two base plates 41 are fixed to one fixing portion 82. Thereby, the electrical connection unit 1 can be miniaturized.

[0238] <I. Advantages Regarding the Manufacturing Method> As a comparative example, consider a configuration in which an electronic component and a bus bar are directly attached. In such a configuration of the comparative example, the following states (1) or (2) may occur. (1) When the bus bar is first fastened to the electronic component and then assembled into the housing, when storing the bus bar to be wired in the housing, it is necessary to check the contact with peripheral components and the assembly of the bus bar, and the workability may be reduced. (2) When the electronic component and the bus bar are each stored in the housing and then the electronic component and the bus bar are fastened, a space for fastening in the horizontal direction is required, and there may be a wasteful space in the electrical connection unit.

[0239] On the other hand, in this embodiment, the manufacturing method of the electrical connection unit 1 includes preparing a wiring board 40, forming an assembly SA, and connecting a connection component (connection component 20, connection component 30, or connection component 100) to a bus bar 42. The wiring board 40 includes a base plate 41 having a plate-shaped flat portion 51 and a bus bar 42 held by the flat portion 51. The flat portion 51 has a housing portion 55 that is recessed in the Z direction or that penetrates the flat portion 51 in the Z direction. At least a portion of the bus bar 42 is housed in the housing portion 55 and extends along the flat portion 51. Forming the assembly SA includes fixing the connection component to a connection target component (electronic component 10, coupling bus bar 75, or external connection bus bar 76) using a first fastening member (fastening member 71, fastening member 72, or fastening member 73) to form an assembly SA in which the connection target component and the connection component are integrated. Connecting the connection components to the bus bar 42 includes, after forming the assembly SA, connecting the connection components included in the assembly SA to the bus bar 42 using second fastening members (e.g., fastening members 43). This configuration can improve the ease of assembling the connection target components and the connection components to the bus bar 42. This can improve the ease of assembling the electrical connection unit 1.

[0240] The second fastening member is not limited to fastening member 43 protruding from bus bar 42. When a mounting hole (e.g., a screw hole) is formed in bus bar 42, the second fastening member may be a fastening member (e.g., a bolt or a screw) that passes through an insertion hole provided in the component to be connected and engages with the mounting hole in bus bar 42.

[0241] In this embodiment, an example of the component to be connected is electronic component 10. The connection component is fixed to terminal 13 of electronic component 10 using the first fastening member. With this configuration, by forming assembly SA using electronic component 10 and connection component 20, it is possible to improve the ease of assembling electronic component 10 and connection component 20 to bus bar 42. This improves the ease of assembly of electrical connection unit 1.

[0242] In this embodiment, the operation of fixing the connection component to the connection target component using the first fastening member is performed with the connection target component and the connection component in a first position. The operation of fixing the connection component included in the assembly SA to the bus bar 42 using the second fastening member is performed with the connection target component and the connection component in a second position different from the first position. With this configuration, even if the connection direction between the connection target component and the connection component is horizontal after the electrical connection unit 1 is assembled, the connection target component and the connection component can be attached in a direction different from the horizontal during assembly, thereby reducing the burden on the worker and improving the ease of assembly of the electrical connection unit 1.

[0243] In this embodiment, the connection component has a first mounting hole into which the first fastening member is inserted and a second mounting hole that opens in a direction different from the first mounting hole and into which the second fastening member is inserted. The first position is a position in which the first mounting hole faces a first mounting direction. The second position is a position in which the first mounting hole faces a direction different from the first mounting direction and the second mounting hole faces the first mounting direction. With this configuration, even if the connection direction between the connection target component and the connection component is horizontal, the mounting direction between the connection target component and the connection component and the assembly direction of the assembly SA relative to the bus bar 42 can be aligned in the same direction. This further reduces the burden on the worker and further improves the ease of assembly of the electrical connection unit 1.

[0244] In this embodiment, the connection component 20 has a first portion 21 to which the first fastening member is attached and connected to the electronic component 10, and a second portion 22 to which the second fastening member is attached and connected to the bus bar 42. The thickness T1 of the first portion 21 in the X direction is greater than the thickness of the second portion 22 in the Z direction. According to such a configuration, the connection component 20 has a larger heat capacity per unit length than the bus bar 42. Therefore, even when a short-term large current flows through the electronic component 10 and the electronic component 10 becomes temporarily high in temperature, part of the heat generated by the electronic component 10 is stored by the connection component 20. Thereby, the temperature change inside the electrical connection unit 1 can be suppressed. Thereby, the thermal characteristics (for example, heat resistance) of the electrical connection unit 1 can be improved.

[0245] From another perspective, in this embodiment, the connection component 20 is disposed between the first terminal 13 of the electronic component 10 and the bus bar 42. The connection component 20 electrically connects the electronic component 10 and the bus bar 42. At least a part of the thickness of the connection component 20 is greater than the plate thickness of the bus bar 42 in the Z direction. According to such a configuration, the connection component 20 has a larger heat capacity per unit length than the bus bar 42. Therefore, even when a short-term large current flows through the electronic component 10 and the electronic component 10 becomes temporarily high in temperature, part of the heat generated by the electronic component 10 is stored by the connection component 20. Thereby, the temperature change inside the electrical connection unit 1 can be suppressed. Thereby, the thermal characteristics (for example, heat resistance) of the electrical connection unit 1 can be improved.

[0246] <J. Advantages of the split structure> As a comparative example, consider a configuration in which there is no metal plate 80 in a configuration where the main body portion MU is divided into a plurality of sub-units SU. In such a configuration of the comparative example, in order to ensure the rigidity of the connection portion of the plurality of sub-units SU, it may be necessary to increase the plate thickness of the base plate 41 or add reinforcing components. In this case, it may be difficult to reduce the height of the electrical connection unit 1.

[0247] On the other hand, in this embodiment, the electrical connection unit 1 includes a first subunit SU, a second subunit SU electrically connected to the first subunit SU, and a metal plate 80. The first subunit SU includes a plurality of first electronic components (e.g., a plurality of electronic components 10), a plurality of first bus bars (e.g., a plurality of bus bars 42), and a first base member (e.g., a base plate 41). The plurality of first bus bars include portions arranged on the same plane as one another and are electrically connected to the plurality of first electronic components. The first base member includes a plate-shaped first flat portion that holds the plurality of first bus bars. The second subunit SU includes a plurality of second electronic components (e.g., a plurality of electronic components 10), a plurality of second bus bars (e.g., a plurality of bus bars 42), and a second base member (e.g., a base plate 41). The plurality of second bus bars include portions arranged on the same plane as one another and are electrically connected to the plurality of second electronic components. The second base member includes a plate-shaped second flat portion that holds the plurality of second bus bars. The first subunit SU and the second subunit SU are fixed to the metal plate 80, which holds the first subunit SU and the second subunit SU together. With this configuration, the rigidity of the connection between the first subunit SU and the second subunit SU can be ensured by the metal plate 80. This eliminates or reduces the need to increase the thickness of the base plate 41 or add reinforcing parts, and allows the electrical connection unit 1 to have a lower height than if the metal plate 80 were not present.

[0248] In this embodiment, the first flat portion has a plurality of first accommodating portions that are recessed in the Z direction or that penetrate the first flat portion in the Z direction and accommodate a plurality of first bus bars. The second flat portion has a plurality of second accommodating portions that are recessed in the Z direction or that penetrate the second flat portion in the Z direction and accommodate a plurality of second bus bars. This configuration allows the electrical connection unit 1 to be further reduced in height.

[0249] In this embodiment, the longitudinal direction of the first subunit SU is the X direction. The longitudinal direction of the second subunit SU is the X direction. The second subunit SU is adjacent to the first subunit SU in the X direction. The longitudinal direction of the metal plate 80 is the X direction. The length of the metal plate 80 in the X direction is greater than the sum of the length of the first subunit SU in the X direction and the length of the second subunit SU in the second direction. With this configuration, the metal plate 80 can more firmly hold the first subunit SU and the second subunit SU.

[0250] In this embodiment, the electrical connection unit 1 further includes a coupling bus bar 75 that electrically connects the first subunit SU and the second subunit SU. The coupling bus bar 75 is disposed on the opposite side of the metal plate 80 with respect to the first subunit SU and the second subunit SU. With this configuration, the metal plate 80 and the coupling bus bar 75 reinforce the coupling portion between the first subunit SU and the second subunit SU from both sides in the Z direction (the +Z direction side and the −Z direction side). This allows the metal plate 80 to be made thinner, and the electrical connection unit 1 to be made even thinner.

[0251] In this embodiment, the first subunit SU has a first fixing portion 52. The second subunit SU has a second fixing portion 52 that overlaps with the first fixing portion 52 when viewed from the Z direction. The first fixing portion 52 and the second fixing portion 52 are fixed to the metal plate 80 by a single fastening member 111. With this configuration, it is possible to reduce the size of the electrical connection unit 1 in the X direction, and also to reduce costs by reducing the number of parts.

[0252] <15. Variations> Next, several modified examples will be described. Note that in each modified example, the configuration other than that described below is the same as that of the first embodiment.

[0253] (First Modification) The wiring board 40 is not limited to a structure in which the base plate 41 and the bus bar 42 are integrated by insert molding. For example, the base plate 41 may be molded with a housing portion 55 for housing the bus bar 42, and then the bus bar 42 may be placed in the housing portion 55. In this case, the bus bar 42 may be fixed to the housing portion 55 by fitting, or may be fixed to the housing portion 55 by adhesive or other fixing means. In these cases, potting may be applied to fill the gap between the bus bar 42 and the housing portion 55.

[0254] (Second Modification) The base member of the wiring board 40 is not limited to the base plate 41 having the plate-shaped flat portion 51. The wiring board 40 may be a base member having a sheet-shaped flat portion 51 (for example, an insulating sheet). In this case, the accommodation portion 55 may be formed by a portion of the flat portion 51 conforming to the outer shape of the bus bar 42. In this disclosure, the term "sheet-shaped" or "sheet" is not limited to a member having a thickness of 1 mm or more, and may also refer to a member having a thickness of less than 1 mm (so-called film).

[0255] (Third Modification) The base plate 41 of the wiring board 40 may include multiple members (plate members or sheet members). The multiple members are arranged to sandwich the multiple bus bars 42 arranged in the horizontal direction. For example, the multiple members are integrated by sandwiching the multiple bus bars 42, for example, by lamination molding. The multiple members form a planar portion 51. In this case, the accommodating portion 55 may be formed hollow inside the base plate 41 (between the multiple members). The multiple members may be multiple plate members, multiple sheet members, or a combination of plate members and sheet members. The sheet member may be, for example, a flexible sheet member. The planar portion 51 formed by the multiple members has openings that expose at least the first connection portion 61 and the second connection portion 62 of the bus bars 42.

[0256] (Fourth Modification) The connection between the electronic component 10 and the bus bar 42 is not limited to the connection via the connection component 20. The electronic component 10 may be directly connected to the bus bar 42 using a fastening member (for example, a bolt or a screw), welding, or the like.

[0257] (Second embodiment) Next, a second embodiment will be described. The second embodiment differs from the first embodiment in that a heat dissipation opening 121 is provided in the base plate 41. Note that the configuration other than that described below is the same as that of the first embodiment.

[0258] Fig. 35 is a perspective view illustrating a subunit SU of the second embodiment. Fig. 36 is a cross-sectional view taken along line F36-F36 of the structure shown in Fig. 35. As in the first embodiment, the electrical connection unit 1 of the second embodiment has a metal plate 80 that is disposed with a gap S1 between it and the base plate 41 and faces the second surface 51b of the flat portion 51. A heat transfer member 92 is present between the bus bar 42 and the metal plate 80. In this configuration, heat may be trapped in the gap S1 between the base plate 41 and the metal plate 80.

[0259] In this embodiment, the flat surface portion 51 of the base plate 41 has an opening 121 for heat dissipation. The opening 121 penetrates the flat surface portion 51 in the Z direction, communicates with the gap S1 between the flat surface portion 51 and the metal plate 80, and allows air to pass through. The air in the gap S1 between the flat surface portion 51 and the metal plate 80 moves upward through the opening 121 as it is heated, for example.

[0260] This configuration makes it difficult for heat to be trapped in the gap S1 between the base plate 41 and the metal plate 80. When heat is less likely to be trapped in the gap S1, the heat dissipation performance of the bus bar 42 is improved. When the heat dissipation performance of the bus bar 42 is improved, the heat dissipation performance of the electrical connection unit 1 can be improved.

[0261] (Third embodiment) Next, a third embodiment will be described. The third embodiment differs from the first embodiment in that an insulating portion is provided to improve insulation between adjacent bus bars 42. Note that the configuration other than that described below is the same as that of the first embodiment.

[0262] FIG. 37 is a perspective view illustrating a subunit SU of the third embodiment. In the third embodiment, the base plate 41 has a cover portion 51v. The cover portion 51v is an insulating portion that covers a portion of the bus bar 42 on at least one of the first surface 51a side and the second surface 51b side. The cover portion 51v covers, for example, at least a portion of the extension portion 63 of the bus bar 42. Alternatively / in addition to the above example, the cover portion 51v covers at least a portion of the extension portion 64 of the bus bar 42. The cover portion 51v is provided, for example, in a portion where two bus bars 42 are adjacent to each other within a predetermined distance.

[0263] This configuration improves the insulation between adjacent bus bars 42, making it easier to ensure an insulation distance between adjacent bus bars 42. Note that cover portion 51v may be formed by insert molding, for example, like other portions of flat portion 51. Alternatively, cover portion 51v may be formed by applying an insulating material to the surface of bus bar 42 or by attaching an insulating sheet. Cover portion 51v may be provided as part of base plate 41, or may be formed by a component that is provided separately from base plate 41 and then attached to base plate 41.

[0264] (Fourth embodiment) Next, a fourth embodiment will be described. The fourth embodiment differs from the first embodiment in that a holding portion 131 is provided to support the bus bar 42. Note that the configuration other than that described below is the same as that of the first embodiment.

[0265] Fig. 38 is a perspective view illustrating a subunit SU of the fourth embodiment. Fig. 39 is a cross-sectional view taken along line F39-F39 of the structure shown in Fig. 38. In the fourth embodiment, base plate 41 has holding portions 131 and 132 that overlap with portions of busbar 42 when viewed from the Z direction and support busbar 42 in the Z direction. Note that only one of holding portion 131 and holding portion 132 may be provided.

[0266] The holding portion 131 is disposed adjacent to the first surface 51a of the flat portion 51, for example, and above the bus bar 42, supporting the bus bar 42 from above. The holding portion 131 holds the bus bar 42 to prevent it from falling off upward. On the other hand, the holding portion 132 is disposed adjacent to the second surface 51b of the flat portion 51 and supports the bus bar 42 from below. The holding portion 132 holds the bus bar 42 to prevent it from falling off downward. The holding portions 131 and 132 are provided, for example, on the extending portion 63 or the extending portion 64 of the bus bar 42. However, the holding portions 131 and 132 may also be provided on the first connecting portion 61 or the second connecting portion 62 of the bus bar 42.

[0267] With this configuration, even if a gap may occur between housing portion 55 and bus bar 42 during thermal expansion due to a difference between the linear expansion coefficients of base plate 41 and bus bar 42, bus bar 42 is less likely to fall off base plate 41. This improves the heat resistance of electrical connection unit 1.

[0268] The holding portions 131 and 132 may be formed by insert molding, for example, in the same manner as other portions of the flat portion 51. Alternatively, the holding portions 131 and 132 may be formed as separate parts that are attached to the base plate 41 after being provided separately from the base plate 41.

[0269] (Variation) 40 is a cross-sectional view showing a modification of the fourth embodiment. In this modification, the upper surface of busbar 42 has a recess 42g recessed in the -Z direction. Recess 42g extends, for example, in the Y direction. Similarly, the lower surface of busbar 42 has a recess 42g recessed in the +Z direction. Recess 42g extends, for example, in the Y direction.

[0270] In this modification, holding portion 131 is provided in recess 42g on the upper surface of bus bar 42. Similarly, holding portion 132 is provided in recess 42g on the lower surface of bus bar 42. For example, holding portions 131 and 132 are formed within the thickness of bus bar 42 in the Z direction. This configuration makes it even easier to reduce the height of electrical connection unit 1.

[0271] (Fifth embodiment) Next, a fifth embodiment will be described. The fifth embodiment differs from the first embodiment in that a support portion 141 is provided to press the bus bar 42 toward the heat transfer member 92. Note that the configuration other than that described below is the same as that of the first embodiment.

[0272] Fig. 41 is a perspective view illustrating a subunit SU of the fifth embodiment. Fig. 42 is a cross-sectional view taken along line F42-F42 of the structure shown in Fig. 41. In the fifth embodiment, base plate 41 has support parts 141 that are arranged on the opposite side of bus bar 42 from heat transfer member 92 and press bus bar 42 toward heat transfer member 92.

[0273] In this embodiment, the heat transfer member 92 has elasticity. Therefore, by pressing the bus bar 42 toward the heat transfer member 92 and increasing the adhesion between the bus bar 42 and the heat transfer member 92, heat dissipation can be improved. The plurality of support portions 141 includes, for example, a support portion 141A and a support portion 141B. Note that only one of the support portion 141A and the support portion 141B may be provided.

[0274] Support portion 141A is, for example, disposed adjacent to first surface 51a of flat portion 51, disposed above bus bar 42, and supports bus bar 42 from above. When viewed from the Z direction, support portion 141A overlaps with at least a portion of heat transfer member 92. When viewed from the Z direction, support portion 141A presses bus bar 42 toward heat transfer member 92 in the region overlapping with heat transfer member 92.

[0275] Support portion 141B is, for example, disposed adjacent to first surface 51a of flat portion 51, disposed above bus bar 42, and supports bus bar 42 from above. When viewed from the Z direction, support portion 141B overlaps with at least a portion of electronic component 10. When viewed from the Z direction, support portion 141B presses bus bar 42 toward heat transfer member 92 in the region overlapping with electronic component 10.

[0276] Note that support portion 141 is not limited to support portion 141A or support portion 141B described above, and may be a support portion that presses bus bar 42 toward heat transfer member 92 at another location.

[0277] With this configuration, bus bar 42 is pressed toward heat transfer member 92 by support portion 141, thereby improving the adhesion between bus bar 42 and heat transfer member 92. This can further improve the heat dissipation performance of electrical connection unit 1.

[0278] The support portion 141 may be formed by insert molding, for example, in the same manner as other portions of the flat portion 51. Alternatively, the support portion 141 may be formed as a separate part that is attached to the base plate 41 after being provided separately from the base plate 41.

[0279] Several embodiments and modifications have been described above. However, the embodiments and modifications are not limited to the above examples. For example, multiple embodiments may be realized in combination with each other. [Explanation of symbols]

[0280] 1...Electrical connection unit SU...subunit 10...Electronic components 13, 13A, 13B...Terminals 20...Connection parts 21…Part 1 21h...First mounting hole 22…Second part 22h: Second mounting hole 30...Connection parts 31…Part 1 32…Second part 40...Wiring board 41...Base plate 42...Busbar 42e1...busbar end 42p…board part 42u…Exposed part 42ua…1st part 42ub…Second part 43... Fastening member (fastening portion) 51...Flat surface portion (insulating base portion) 51a…1st side, 3rd side 51b…2nd side, 4th side 52…Fixed part 52a...first part, third part 52b...Second part, fourth part 55...Storage section 56...Engagement portion 56a...depression 61...First connection part 62...Second connection part 63…Extension part 64...Extension part 71...Fastening member 72...Fastening member 73...Fastening member 80...Metal plate 81…Plane part (metal base) 82…Fixed part 83…Fixed part 92...Heat transfer member 92a...First heat transfer section 92b...Second heat transfer section 100...Connection parts 101…Part 1 102…Second part 111...Fastening member 112...Fastening member 121…opening 131, 132… Maintaining Department 141… Support Department

Claims

1. a first electronic component having a first terminal; an arrangement board including an insulating base member having a plate-like or sheet-like flat portion with a first surface facing the first electronic component, and a first bus bar held on the flat portion and electrically connected to the first terminal of the first electronic component, wherein, when a thickness direction of the flat portion is defined as a first direction, the flat portion has a first accommodating portion that is recessed in the first direction or that penetrates the flat portion in the first direction, and at least a portion of the first bus bar is accommodated in the first accommodating portion and extends along the flat portion; An electrical connection unit comprising:

2. a first connection component that electrically connects the first electronic component and the first bus bar; the first bus bar has a first connection portion that contacts the first connection component, The first connection portion is accommodated in the first accommodation portion and extends along the planar portion. The electrical connection unit according to claim 1 .

3. a second connection component for electrically connecting a second electronic component or an external device to the first bus bar; the first bus bar has a second connection portion that contacts the second connection part, the first bus bar is accommodated in the first accommodating portion across at least the first connection portion and the second connection portion and extends along the planar portion; 3. The electrical connection unit according to claim 2.

4. the first bus bar has an extension portion between the first connection portion and the second connection portion, the extension portion is accommodated in the first accommodation portion and extends across a region overlapping with the first electronic component when viewed from the first direction, to both sides of the region.

4. The electrical connection unit according to claim 3.

5. the first bus bar includes an extension portion that extends to a region overlapping with the first electronic component when viewed from the first direction and has an end at a position overlapping with the first electronic component; The extension portion is accommodated in the first accommodation portion and extends along the planar portion.

4. The electrical connection unit according to claim 3.

6. the first bus bar is accommodated in the first accommodating portion over the entire length of the first bus bar and extends along the flat portion; An electrical connection unit according to any one of claims 1 to 5.

7. a second bus bar electrically connected to a second terminal of the first electronic component; the planar portion has a second housing portion at a position away from the first housing portion, the second housing portion being recessed in the first direction or penetrating the planar portion in the first direction, At least a portion of the second bus bar is accommodated in the second accommodation portion and extends along the planar portion. An electrical connection unit according to any one of claims 1 to 5.

8. Further comprising a third bus bar; the first bus bar is a bus bar included in a positive electrode line, the third bus bar is a bus bar included in a negative electrode line, the planar portion has a third housing portion at a position away from the first housing portion, the third housing portion being recessed in the first direction or penetrating the planar portion in the first direction, At least a portion of the third bus bar is accommodated in the third accommodation portion and extends along the planar portion. An electrical connection unit according to any one of claims 1 to 5.

9. a fourth bus bar; A fifth bus bar; a third connection part that electrically connects the fourth bus bar and the fifth bus bar; Furthermore, the planar portion has a fourth housing portion at a position away from the first housing portion, the fourth housing portion being recessed in the first direction or penetrating the planar portion in the first direction, At least a portion of the fourth bus bar is accommodated in the fourth accommodation portion and extends along the planar portion, the third connection component includes a portion that stands upright relative to the fourth bus bar, the fifth bus bar is supported by the third connection component at a position spaced apart from the first bus bar in the first direction, and extends parallel to the first surface; An electrical connection unit according to any one of claims 1 to 5.

10. the fifth bus bar extends across the first bus bar at a position spaced apart from the first bus bar in the first direction; 10. The electrical connection unit of claim 9.

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