Electric connection unit

Abstract

To provide an electric connection unit that can be suppressed from getting large-sized.SOLUTION: An electric connection unit comprises an electronic component which has a terminal at a component end in a second direction, a wiring board which comprises a base member and a bus bar, and a connection component which comprises a first part having a first fitting hole and raised in a first direction relative to a first surface and a second part having a second fitting hole and protruding from a first surface-side end of the first part along the first surface, wherein the second fitting hole shifts from the position where it is aligned with the first fitting hole in the second direction in plan view from the first direction.SELECTED DRAWING: Figure 7

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 tend to become larger in size as the current through which they are used increases.

[0005] One embodiment provides an electrical connection unit that can suppress an increase in size. [Means for solving the problem]

[0006] In one embodiment, the electrical connection unit comprises: an electronic component having a terminal at an end of the component in a second direction; a base member having a first surface facing the electronic component and a plate- or sheet-like flat portion having a thickness in the first direction; a bus bar held on the flat portion, extending along the flat portion, and having a connection portion; and a connection component arranged between the electronic component and the bus bar, the connection component comprising: a first portion having a first mounting hole extending in the second direction and having an upright posture in the first direction relative to the first surface; and a second portion having a second mounting hole extending in the first direction and protruding along the first surface from an end of the first portion on the first surface side, the connection component electrically connecting the terminal and the connection portion; and in a plan view seen from the first direction, the position of the second mounting hole is offset from the position aligned in the second direction relative to the position of the first mounting hole. [Effects of the Invention]

[0007] According to one embodiment, it is possible to prevent the electrical connection unit from becoming too large. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view showing the electrical connection unit according to the embodiment. [Figure 2] FIG. 2 is a perspective view illustrating a main body of the embodiment. [Figure 3] FIG. 2 is a perspective view showing a subunit of the embodiment. [Figure 4] FIG. 2 is a partially exploded perspective view of a subunit according to the embodiment. [Figure 5] FIG. 2 is a partially exploded perspective view of the electronic component and the connecting component according to the embodiment. [Figure 6] FIG. 2 is an enlarged perspective view showing a main part of a subunit according to the embodiment. [Figure 7] FIG. 2 is an enlarged plan view showing a main part of the subunit according to the embodiment. [Figure 8] 11 is a cross-sectional view of the structure shown in FIG. 10 taken along line F8-F8. [Figure 9] FIG. 2 is a perspective view showing the wiring board according to the embodiment. [Figure 10]FIG. 2 is a plan view showing the wiring board according to the embodiment. [Figure 11] FIG. 2 is a partially exploded perspective view of the electrical connection unit according to the embodiment. [Figure 12] FIG. [Figure 13] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the embodiment. [Figure 14] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the embodiment. [Figure 15] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the embodiment. [Figure 16] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the embodiment. [Figure 17] 5A to 5C are cross-sectional views illustrating a method for manufacturing the electrical connection unit according to the embodiment. [Figure 18] 5A to 5C are diagrams illustrating the operation of the electrical connection unit according to the embodiment. 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 can include electrical connection. In other words, "connection" is not limited to direct connection between two elements to be connected, but can also include connection between two elements via another element interposed between them. "Containment" is not limited to entire components being contained, but can include only partial containment (with the remaining part 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 can include two objects facing each other with another component interposed between them. "Parallel," "orthogonal," and "same" can include "approximately parallel," "approximately perpendicular," and "approximately the same," respectively. "Sheet-like" or "sheet" is not limited to components with a thickness of 1 mm or more, but can also include components with a thickness of less than 1 mm (so-called films).

[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."

[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] (Embodiment) <1. Configuration of the electrical connection unit> FIG. 1 is a cross-sectional view showing an electrical connection unit 1 of this 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 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 the external device include, but are not limited to, a battery unit mounted on a vehicle or an inverter for driving a vehicle motor.

[0015] 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.

[0016] <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."

[0017] The subunit SUX has a first electrical function. The subunit SUX includes, for example, a plurality of electronic components 10X and a wiring board 40X. The plurality of electronic components 10X are electrically connected to the wiring board 40X.

[0018] 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 wiring board 40Y. The plurality of electronic components 10Y are electrically connected to the wiring board 40Y.

[0019] 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 wiring board 40Z. The plurality of electronic components 10Z are electrically connected to the wiring board 40Z.

[0020] In this embodiment, the three subunits SUX, SUY, and SUZ are arranged side by side in the X direction.

[0021] 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. The arrangement of these three wiring boards 40X, 40Y, and 40Z forms one large wiring board 40M.

[0022] In this embodiment, the three subunits SUX, SUY, and SUZ have the same or similar basic structures. Below, a detailed description will be given of one subunit SU as a representative. Below, subunits SUX, SUY, and SUZ will not be distinguished from one another and will simply be referred to as "subunit SU." Electronic components 10X, 10Y, and 10Z will not be distinguished from one another and will simply be referred to as "electronic component 10." Routing boards 40X, 40Y, and 40Z will not be distinguished from one another and will simply be referred to as "routing board 40."

[0023] <3. Subunit structure> Next, the configuration of the subunit SU will be described. 3 and 4, the subunit SU includes, for example, a plurality of electronic components 10, a plurality of connection components 20 for connecting the components, and a wiring board 40. Each connection component 20 is a component that forms a vertical current path. The connection components 20 may also be referred to as "vertical wiring components."

[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 mounted on the subunit SU according to the functions required of the subunit. 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 formed by unitizing two or more of these. The electronic component 10 is provided on the +Z direction side of the wiring board 40. 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 powered on.

[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 provided on the +Z direction side of the wiring board 40. 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."

[0026] <3.1.1 Electronic Components> 5, electronic component 10 is an electronic component in which multiple terminals 13 are arranged side by side at one component end 10e of electronic component 10. Electronic component 10 has, for example, case 11, component main body 12, multiple terminals 13, and multiple mounting portions 14.

[0027] (case) Case 11 is an outer shell member that forms most of the outer shape of electronic component 10. 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, a plate-like shape that is aligned in 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, which will be described later). The insulating rib 11a electrically insulates the terminals 13A and 13B. In this embodiment, a portion of the insulating rib 11a is disposed between first portions 21 (described later) of two connection parts 20 that are connected to the electronic component 10. The insulating rib 11a electrically insulates the first portions 21 of the two connection parts 20 that are connected to the electronic component 10.

[0029] (Component body) The component body 12 is a part that performs the main function of the electronic component 10. For example, if the electronic component 10 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 10 is a fuse, the component body 12 includes a fusing part that melts when an overcurrent flows. For example, if the electronic component 10 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 10 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 component end 10e in the horizontal direction (e.g., X direction) of electronic component 10. Terminals 13A and 13B are arranged side by side in the horizontal direction (e.g., Y direction). Each terminal 13 has a mounting hole 13h to which a fastening member 71 (e.g., a screw or bolt) described later is attached. Mounting hole 13h opens in the horizontal direction (e.g., X direction). The inner circumferential surface of mounting hole 13h of electronic component 10 has a threaded groove.

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

[0033] <3.1.2 Connecting parts> The connection part 20 is a part that electrically connects the electronic component 10 and the wiring board 40. In this embodiment, the connection part 20 electrically connects the electronic component 10 and a bus bar 42 (see FIG. 4 ) included in the wiring board 40. The connection part 20 has, for example, a first portion 21 and a second portion 22.

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

[0035] The first portion 21 of the connecting component 20 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 opens in the horizontal direction (e.g., the X direction). The fastening member 71 passed through the first mounting hole 21h engages with a mounting hole 13h in the terminal 13 of the electronic component 10, thereby physically and electrically connecting the first portion 21 to the terminal 13 of the electronic component 10. The fastening member 71 is an example of a first fastening portion.

[0036] (Second part) The second portion 22 of the connection component 20 is a portion that is connected to the bus bar 42 (see FIG. 8 ). The second portion 22 protrudes in the horizontal direction (e.g., the X direction) from the end 10f of the first portion 21 on the −Z direction side. The second portion 22 is a plate portion that extends horizontally and along the wiring board 40. 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 component 20 is attached from the +Z direction to a fastening member 43 (e.g., a screw or bolt, see FIG. 3 ) that protrudes from the bus bar 42 in the +Z direction, thereby being physically and electrically connected to the bus bar 42. In this embodiment, the second portion 22 of the connection component 20 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. 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 a single connecting part 20 that is L-shaped in a side view seen from the Y direction.

[0037] 6 and 7, the position of the second mounting hole 22h is shifted in the -Y direction relative to the position of the first mounting hole 21h in the connecting part 20. Specifically, as shown in Fig. 7, in a plan view seen from the Z direction (first direction), the position of the second mounting hole 22h is shifted from a position aligned in the X direction (second direction) relative to the position of the first mounting hole 21h. In other words, in a plan view seen from the Z direction, the hole center 22c of the second mounting hole 22h is shifted in the Y direction relative to an extension line LX1 of the axis of the first mounting hole 21h. Note that this positional relationship can also be said to be a shift in the Y direction of the axis of the second mounting hole 22h relative to the ZX plane including the axis of the first mounting hole 21h. For example, in a plan view seen from the Z direction, the position of second mounting hole 22h may be shifted in the Y direction so that hole center 22c of second mounting hole 22h is located farther from the inner circumference of first mounting hole 21h with respect to extension line LX1 of the axis of first mounting hole 21h. For example, in a side view seen from the X direction, the position of second mounting hole 22h may be shifted in the Y direction so that the axis of second mounting hole 22h is located outside first mounting hole 21h.

[0038] 7, for example, in a plan view seen from the Z direction, at least a portion of the fastening member 43 (including a head 43b and a shank 43a, described below) may overlap an outer diameter region RG1, which is a region obtained by extending a portion of the fastening member 71 having the outermost diameter in the X direction. Here, the "portion having the outermost diameter of the fastening member 71" may be the head of the fastening member 71. For example, in a plan view seen from the Z direction, at least a portion of the shank 43a of the fastening member 43 may overlap the outer diameter region RG1. For example, in a plan view seen from the first direction, an axial center 43c of the shank 43a of the fastening member 43 may overlap the outer diameter region RG1.

[0039] For example, in a plan view seen from the Z direction, second mounting hole 22h may be located on first center line LC1, which is the center line of second portion 22 extending in the X direction. For example, in a plan view seen from the Z direction, hole center 22c of second mounting hole 22h may be located on first center line LC1 of second portion 22 extending in the X direction. Here, first center line LC1 of second portion 22 is a symmetry axis that divides second portion 22 into line-symmetrical portions in a plan view seen from the Z direction.

[0040] For example, in a plan view seen from the Z direction, the first mounting hole 21h may be closer to the second center line LC2, which is the center line of the component end 10e of the electronic component 10 extending in the X direction, than the second mounting hole 22h. That is, in a plan view seen from the Z direction, the first mounting hole 21h may be closer to the second center line LC2, which extends in the X direction, of the component end 10e of the electronic component 10 than the second mounting hole 22h. Here, the second center line LC2 of the component end 10e is an axis of symmetry that divides the plane of the component end 10e in a side view seen from the X direction into linearly symmetrical portions.

[0041] For example, when two connecting parts 20 are attached to a component end 10e of an electronic component 10 side by side in the Y direction, in a plan view seen from the Z direction, the first mounting hole 21h of each connecting part 20 may be configured to be closer to the second center line LC2 of the component end 10e of the electronic component 10, which extends in the X direction, than the second mounting hole 22h. In other words, the distance between the first mounting holes 21h of the two connecting parts 20 may be closer than the distance between the second mounting holes 22h of the two connecting parts 20.

[0042] The connection parts 20 are heat storage members (heat absorption members) that increase the heat capacity of the current paths of the electrical connection unit 1. The connection parts 20 store (absorb) at least a portion of the heat generated by the electronic components 10, for example. Alternatively / in addition to this, the connection parts 20 may store (absorb) at least a portion of the heat generated by the bus bars 42 when current is applied. The connection parts 20 may also be referred to as "heat storage parts" or "heat absorption parts."

[0043] As shown in FIG. 8 , connection component 20 is disposed between electronic component 10 and 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 or 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 or Y direction. Connection component 20 electrically connects terminal 13 of electronic component 10 and bus bar 42.

[0044] In this embodiment, the thickness of at least a portion of the connection part 20 is greater than the thickness T3 of the bus bar 42. For example, the thickness T1 of at least a portion of the connection part 20 in the X direction is greater than the thickness T3 of the bus bar 42. In this embodiment, the thickness T1 of the first portion 21 of the connection part 20 in the X direction 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. From another perspective, the thickness T2 of the second portion 22 of the connection part 20 in the Z direction may be greater than the thickness T3 of the bus bar 42.

[0045] 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 that is greater than the thickness T2 of the second portion 22 over the entire length of the first portion 21 in the Z direction.

[0046] <3.2 Wiring board> Next, the wiring board 40 will be described. FIG. 9 is a perspective view showing a wiring board 40. The wiring board 40 is a member 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 and extends along a single plane when viewed as a whole, regardless of its detailed shape. In this disclosure, "plate-like" does not necessarily mean a completely flat structure, but may also include a structure that has fixing structures or ribs protruding in the Z direction. In this embodiment, the wiring board 40 is plate-like and extends along the X and Y directions.

[0047] 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 using another structure instead of insert molding.

[0048] (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.

[0049] 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.

[0050] 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.

[0051] (busbar) The busbars 42 are wiring members (electrical connection members) included in the wiring board 40. The busbars 42 are, for example, wiring members for electrically connecting a plurality of electronic components 10. Alternatively, the busbars 42 may be wiring 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 wiring board 40 includes a plurality of busbars 42 each having a portion that is arranged on the same plane. Each busbar 42 is held by a flat portion 51 of the base plate 41.

[0052] 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." Of the multiple bus bars 42, some bus bars 42 may be, for example, bus bars included in a positive electrode line of the electrical connection unit 1. Of the multiple bus bars 42, some bus bars 42 other than the bus bars included in the positive electrode line may be, for example, bus bars included in a negative electrode line of the electrical connection unit 1.

[0053] 10 is a plan view showing the wiring board 40. The plate portion 42p of each bus bar 42 has, for example, a connection portion 61 and an extension portion 63.

[0054] The connection portion 61 is a portion that comes into contact with one connection component 20. The connection component 20 is a connection component that connects one electronic component 10 and the bus bar 42. The connection portion 61 is a portion of the bus bar 42 that overlaps with the connection component 20 when viewed from the Z direction. The connection portion 61 is adjacent to the connection component 20 in the Z direction and is connected to the connection component 20 from the Z direction. For example, when viewed from the Z direction, each connection portion 61 is located on the +X direction side or the −X direction side of the electronic component 10. Each connection portion 61 is electrically connected to the terminal 13A or the terminal 13B of the electronic component 10 via the connection component 20.

[0055] The extending portion 63 extends in the X direction or the Y direction from the connecting portion 61. The extending portion 63 is connected to the connecting portion 61 continuously.

[0056] In this embodiment, the connection portion 61 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 connection portion 61 and the extension portion 63, and extends along the flat portion 51. For example, the connection portion 61 and the extension portion 63 are housed in the housing portion 55 and extend along the flat portion 51.

[0057] 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.

[0058] (Fastening member) Returning to Fig. 8, fastening member 43 is a component for fastening bus bar 42 and connection part 20. Fastening member 43 is, for example, a crimp bolt fixed to bus bar 42. Fastening member 43 is an example of a "second fastening portion."

[0059] In this embodiment, the connection portion 61 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. This fixation electrically and physically connects the fastening member 43 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.

[0060] In this embodiment, the connecting part 20 is first fixed to the electronic part 10 by the fastening member 71, and then attached to the fastening member 43 from the Z direction. For example, the shaft 43a of the fastening member 43 is inserted into the second 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 43a of the fastening member 43 protruding from the second mounting hole 22h of the second part 22 of the connecting part 20. The engaging member 44 is attached to the shaft 43a, for example, along the Z direction. This engagement fixes the second part 22 of the connecting part 20 to the fastening member 43.

[0061] <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.

[0062] <4.1 Metal Plate> FIG. 11 is a perspective view showing a partially exploded view of the electrical connection unit 1. The metal plate 80 is a member for ensuring the rigidity of the electrical connection unit 1 and for improving the heat dissipation 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." In this embodiment, the multiple subunits SU (for example, subunits SUX, SUY, SUZ) are each fixed to the metal plate 80. By this fixation, the multiple subunits SU (for example, subunits SUX, SUY, SUZ) are held by the single metal plate 80.

[0063] When viewed from the Z direction, the metal plate 80 has a rectangular shape aligned with 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 end portions 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 end portions 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 and a plurality of fixing portions 82 and 83.

[0064] The flat portion 81 is a portion of the metal plate 80 that is formed into a plate shape. The flat portion 81 is a plate shape that extends horizontally. The flat portion 81 forms the main portion of the metal plate 80. The flat portion 81 forms the base (metal base) of the metal plate 80. In this embodiment, the flat portion 81 is large enough to cover the three subunits SU from below. The flat portion 81 faces the wiring board 40 for the three subunits SU.

[0065] The fixing portion 82 is a fixing portion for fixing the base plate 41 of each subunit SU to the metal plate 80. When viewed from the Z direction, the fixing portion 82 is provided at a position corresponding to the fixing portion 52 of the base plate 41 of each subunit SU. The fixing portion 82 is a cylindrical or prismatic boss that protrudes from the flat portion 81 of the metal plate 80 in the +Z direction.

[0066] The fixing portion 83 is a fixing portion for fixing the electronic component 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 portion 83 is provided at a position corresponding to the mounting portion 14 of the electronic component 10 of each subunit SU. The fixing portion 83 is a cylindrical or prismatic boss that protrudes from the flat portion 81 in the +Z direction.

[0067] <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.

[0068] 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.

[0069] 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 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). 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 materials.

[0070] 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 in 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 in positions overlapping with portions of the bus bars 42 near the electronic components 10 when viewed from the Z direction. In this embodiment, the plurality of heat transfer members 92 are arranged in positions overlapping with the connecting parts 20 when viewed from the Z direction.

[0071] The heat transfer member 92 is disposed between the metal plate 80 and the bus bar 42. The heat transfer member 92 transfers heat transferred from the electronic component 10 to the bus bar 42 and / or heat generated in the bus bar 42 from the bus bar 42 to the metal plate 80.

[0072] 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.

[0073] 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.

[0074] Furthermore, 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 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. 8 , 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.

[0075] <4.4 Insulation cover> Returning to FIG. 1, the insulating cover 93 will be described. The insulating cover 93 is a member for ensuring the safety of 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 a plurality of ventilation holes 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.

[0076] <5. Manufacturing method of electrical connection unit> Next, a method for manufacturing the electrical connection unit 1 will be described. 13 to 17 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. With this integration, the wiring board 40 of each subunit SU is prepared in advance.

[0077] (1st step) 13 shows the first step. In the first step, the connecting part 20 is fixed to the terminal 13 of the electronic part 10 using the fastening member 71. This fixation forms an assembly SA in which the electronic part 10 and the connecting part 20 are integrated together.

[0078] The first step is performed, for example, as follows: First, electronic component 10 is placed on mounting table MP with mounting holes 13h of terminals 13 of electronic component 10 facing vertically. Next, connection component 20 is placed on electronic component 10 with first mounting holes 21h of connection component 20 facing vertically. Then, first mounting holes 21h of connection component 20 are aligned with mounting holes 13h of terminals 13 of electronic component 10. The first step is performed with electronic component 10 and connection component 20 in a first position. In the first position, mounting holes 13h and first mounting holes 21h face vertically.

[0079] Next, fastening member 71 is inserted vertically into first mounting hole 21h of connecting part 20. Then, fastening member 71 that has passed through first mounting hole 21h of connecting part 20 engages with mounting hole 13h of terminal 13 of electronic component 10. This engagement forms assembly SA in which electronic component 10 and connecting part 20 are integrated. The vertical direction is an example of a "first mounting direction."

[0080] (2nd process) 14 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 fixation electrically connects the electronic component 10 and the bus bar 42.

[0081] 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 engagement fixes the second portions 22 of the connection components 20 included in the assembly SA to the busbars 42. This fixation completes each subunit SU.

[0082] Here, the second step is performed, for example, as follows: First, the posture of the assembly SA is rotated 90 degrees from that in the first step. That is, the assembly SA is changed from a first posture (see FIG. 13) in which the mounting hole 13h and the first mounting hole 21h are oriented vertically to a second posture (see FIG. 14) in which the mounting hole 13h and the first mounting hole 21h are oriented horizontally and the second mounting hole 22h of the connecting part 20 is oriented vertically.

[0083] 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 engagement fixes the second portion 22 of the connection part 20 included in the assembly SA to the bus bar 42.

[0084] (3rd step) Figure 15 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 (see Figure 11) 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.

[0085] (4th step) 16 shows the fourth step, in which the mounting portion 14 of the electronic component 10 of each subunit SU is fixed to the fixing portion 83 of the metal plate 80 by the fastening member 112. Note that the fourth step may be performed together with the third step.

[0086] (5th step) 17 shows the fifth step. In the fifth step, the insulating cover 93 is attached to the metal plate 80 in the vertical direction. With this attachment, the electrical connection unit 1 is completed.

[0087] <6. Advantages> In this embodiment, in a plan view seen from the Z direction, the position of the second mounting hole 22h is shifted from the position aligned in the X direction relative to the position of the first mounting hole 21h. This positional relationship allows the electrical connection unit 1 to be configured so that the position of the second mounting hole 22h is closer to the terminal 13. This closer configuration reduces at least the dimension of the connection part 20 in the X direction. This prevents the electrical connection unit 1 from becoming larger.

[0088] As a comparative example, in a plan view seen from the Z direction, the position of the second mounting hole in the second part of the connecting part is aligned in the X direction with the position of the first mounting hole in the first part of the connecting part. In this positional relationship, the position where the fastening member of the second part is provided is limited to a virtual position PS1 as shown in Figure 18, which is sufficiently far away in the +X direction from the fastening member of the first part so that a fastening working space SPC can be secured for the fastening member of the second part. Due to this limitation, the dimension of the connecting part in the X direction is large in the comparative example.

[0089] In contrast to this comparative example, according to this embodiment, the fastening member 43 can be brought closer to the fastening member 71 by a distance equivalent to dX shown in Fig. 18 compared to the virtual position PS1. Therefore, as described above, the dimension of the connecting part 20 in the X direction is reduced.

[0090] Furthermore, by configuring each of the plurality of electronic components 10 so that the second mounting holes 22h are positioned closer to the terminals 13 as described above, the following actions and effects can be expected. For example, by configuring the plurality of electronic components 10 so that the terminals 13 face each other in one direction, the second mounting holes 22h can be spaced apart, and the distance between the second mounting holes 22h of two adjacent electronic components 10 can be maintained large. By maintaining such a distance, for example, it is possible to increase the insulation distance between the fastening members 43 attached to the second mounting holes 22h and to increase the distance between the engaging members 44 engaged with the fastening members 43. Therefore, insulation between the terminals of two adjacent electronic components 10 can be ensured.

[0091] Furthermore, if electronic component 10 is configured such that second mounting holes 22h are positioned closer to terminals 13 as described above, the following actions and effects can be expected. For example, if the above-described configuration is used in a case where there is another structure aligned opposite terminals 13 in one direction, the other structure can be separated from fastening members 43 and engaging members 44 attached to second mounting holes 22h. Therefore, an insulation distance can be ensured between the terminals of electronic component 10 and the other structure.

[0092] In this embodiment, the thickness of at least a portion of the connection part 20 is greater than the plate thickness T3 of the bus bar 42. With this configuration, the connection part 20 has a larger heat capacity per unit length than the bus bar 42. Due to this increased heat capacity, even when a large current flows through the electronic component 10 for a short period of time and the electronic component 10 generates heat, some of the heat generated by the electronic component 10 is stored in the connection part 20. This heat storage makes it possible to suppress temperature changes inside the electrical connection unit 1. Therefore, the thermal characteristics of the electrical connection unit 1 can be improved.

[0093] In this embodiment, the fastening member 71 and the fastening member 43 are positioned in a plan view from the Z direction such that at least a portion of the fastening member 43 overlaps with an outer diameter region RG1, which is a region obtained by extending a portion of the fastening member 71 having the outermost diameter in the X direction. This positional relationship allows the fastening member 43 to be closer to the fastening member 71. Therefore, the dimension of the connecting part 20 in the Y direction in a plan view is reduced.

[0094] In this embodiment, in a plan view seen from the Z direction, the second mounting hole 22h is located on the first center line LC1 of the second portion 22 extending in the X direction. If the second mounting hole 22h is located in such a position, the second portion 22 can be mounted to the connecting portion 61 on the center line of the second portion 22. Therefore, the connecting part 20 can be stably mounted to the bus bar 42.

[0095] In this embodiment, in a plan view seen from the Z direction, the first mounting hole 21h is closer to the second center line LC2 extending in the Z direction of the component end 10e of the electronic component 10 than the second mounting hole 22h. This positional relationship allows the first mounting hole 21h to be positioned closer to the center of the component end 10e of the electronic component 10. This configuration allows the dimension of the first portion 21 of the connecting component 20 in the Y direction to be reduced. This prevents the connecting component 20 from becoming larger.

[0096] In this embodiment, the thickness of the first portion 21 in the X direction is greater than the thickness of the second portion 22 in the X direction. With this configuration, a larger heat capacity can be ensured for the first portion 21 of the connection part 20. Therefore, the thermal characteristics of the electrical connection unit 1 can be further improved.

[0097] <7. Variations> Next, several modified examples will be described. Note that the configuration of each modified example is the same as that of the above-described embodiment except for the configuration described below.

[0098] In the above-described embodiment, in a plan view seen from the Z direction, the position of the second mounting hole 22h is shifted in the Y direction from the position aligned in the X direction relative to the position of the first mounting hole 21h to the side away from the second center line LC2 of the component end 10e. However, as long as the dimension of the connecting part 20 in the X direction is reduced, the position of the second mounting hole 22h may be shifted in any direction relative to the position of the first mounting hole 21h. As a variation, in a plan view seen from the Z direction, the position of the second mounting hole 22h may be shifted in the Y direction from the position aligned in the X direction relative to the position of the first mounting hole 21h to the side closer to the second center line LC2 of the component end 10e.

[0099] 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.

[0100] 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 (for example, an insulating sheet) having a sheet-shaped flat portion 51. In this case, a part of the flat portion 51 may conform to the outer shape of the bus bar 42 to form the accommodation portion 55.

[0101] 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]

[0102] 1 Electrical Connection Unit 10. Electronic Components 10e Component end 10f end 10X Electronic Components 10Y Electronic Components 10Z Electronic Components 11 cases 11a Insulating rib 12 Component body 13 terminals 13A terminal 13B terminal 13h Mounting hole 14 Mounting part 14h mounting hole 20 Connecting parts 21 Part 1 21h First mounting hole 22 Part 2 22c hole center 22h Second mounting hole 40 Wiring board 40M wiring board 40X wiring board 40Y wiring board 40Z wiring board 41 Base plate (base member) 42 Busbar 42h through hole 42p board part 43 Fastening member (second fastening portion) 43a Shaft 43b Head 43c axis center 44 Engagement member 51 Plane part 51a 1st page 51b 2nd side 52 Fixed part 55 Storage section 61 Connection 63 Stretching section 71 Fastening member (first fastening portion) 80 Metal Plate 80e1 1st end 80e2 2nd end 80e3 3rd end 80e4 4th end 81 Plane part 82 Fixed part 83 Fixed part 91 Insulation sheet 92 Heat transfer materials 93 Insulating cover 93h Ventilation hole 111 Fastening members 112 Fastening members LC1 1st center line LC2 2nd center line LX1 extension line MP mounting table MU main body PS1 Virtual Position R area RG1 outer diameter area SA assembly SPC fastening work space SU subunit SUX subunit SUY subunit SUZ subunit T1 Thickness T2 Thickness T3 plate thickness

Claims

1. an electronic component having a terminal at an end of the component in the second direction; a wiring board including: a base member having a plate-like or sheet-like planar portion having a first surface facing the electronic component and a thickness in a first direction; and a bus bar held on the planar portion, extending along the planar portion, and having a connection portion; a connection component including: a first portion having a first mounting hole extending in the second direction and standing in the first direction relative to the first surface; and a second portion having a second mounting hole extending in the first direction and protruding along the first surface from an end of the first portion on the first surface side, the connection component being disposed between the electronic component and the bus bar and electrically connecting the terminal and the connection portion; Equipped with In a plan view seen from the first direction, the position of the second mounting hole is shifted from the position aligned in the second direction with respect to the position of the first mounting hole. Electrical connection unit.

2. At least a part of the connection component has a thickness greater than the thickness of the bus bar. The electrical connection unit according to claim 1 .

3. a first fastening portion that is passed through the first mounting hole and attached to the terminal; the wiring board further includes a second fastening portion fixed to the bus bar and passed through the second mounting hole, In a plan view seen from the first direction, at least a portion of the second fastening portion overlaps an outer diameter region that is a region obtained by extending a portion of the first fastening portion having an outermost diameter in the second direction.

3. The electrical connection unit according to claim 1 or 2.

4. In the plan view, the second mounting hole is located on a first center line that is a center line of the second portion extending in the second direction.

3. The electrical connection unit according to claim 1 or 2.

5. In the plan view, the first mounting hole is closer to a second center line, which is a center line of the component end extending in the second direction, than the second mounting hole.

5. The electrical connection unit according to claim 4.

6. The thickness of the first portion in the second direction is greater than the thickness of the second portion in the first direction.

3. The electrical connection unit according to claim 1 or 2.

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