ELECTRICAL CONNECTION UNIT

Abstract

An electrical connection unit comprises a first electronic component, an insulating base element, and a first busbar. The base element includes a plate-shaped or sheet-shaped flat surface section with a first surface facing the first electronic component. If a thickness direction of the flat surface section is a first direction, the flat surface section includes a first receiving section that is recessed in the first direction or that penetrates the flat surface section in the first direction. The first busbar has a first connecting section that is electrically connected to the first electronic component, with at least a portion of the first busbar being received in the first receiving section and extending along the flat surface section.At least the first connecting section of the first busbar projects from the first surface in the first direction beyond the first receiving section.

Description

BACKGROUND OF THE INVENTION Area of ​​the invention

[0001] Embodiments of the present invention relate to an electrical connection unit. Description of relevant technology

[0002] An electrical connection unit with a housing that accommodates electronic components and a busbar that is vertically attached to the housing is known.

[0003] [Patent document 1] Japanese unexamined patent application, first publication no. 2024-037492 PRESENTATION OF THE INVENTION

[0004] Furthermore, the height of an electrical connection unit is to be reduced further.

[0005] One embodiment provides an electrical connection unit that enables a reduction in height.

[0006] An electrical connection unit according to one embodiment comprises a first electronic component, an insulating base element, and a first busbar. The base element comprises a plate-shaped or sheet-shaped flat surface section with a first surface facing the first electronic component. If a thickness direction of the flat surface section is a first direction, the flat surface section comprises a first receiving section that is recessed in the first direction or penetrates the flat surface section in the first direction. The first busbar has a first connecting section that is electrically connected to the first electronic component, wherein at least a portion of the first busbar is received in the first receiving section and extends along the flat surface section.At least the first connecting section of the first busbar projects from the first surface in the first direction beyond the first receiving section.

[0007] According to one embodiment, the height of an electrical connection unit can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a cross-sectional view illustrating an electrical connection unit of a first embodiment; Fig. Figure 2 is a perspective view to describe a main body of the first embodiment; Fig. Figure 3 is a perspective view to describe a subunit of the first embodiment; Fig. Figure 4 is a partially separated perspective view of the subunit of the first embodiment; Fig. Figure 5 is a perspective view to describe an electronic component and a connecting component of the first embodiment; Fig. Figure 6 is a perspective view to describe the electronic component and the connection component of the first embodiment; Fig. Figure 7 is a perspective view illustrating the connecting component of the first embodiment; Fig. Figure 8 is a perspective view illustrating a routing board of the first embodiment; Fig. 9 is a partially separated perspective view of the laying board according to the first embodiment; Fig. Figure 10 is a top view illustrating the laying board of the first embodiment; Fig. Figure 11 is a partially separated perspective view of a connecting unit of the first embodiment; Fig. 12 is a view from below illustrating the laying board of the first embodiment; Fig. 13 is a cross-sectional view along line F13-F13 of a Fig. 10 illustrated structures; Fig. 14 is a cross-sectional view along line F14-F14 of the in Fig. 10 illustrated structures; Fig. Figure 15 is a perspective view illustrating a three-dimensional routing structure of a busbar according to the first embodiment; Fig. Figure 16 is a top view illustrating a three-dimensional busbar routing structure according to the first embodiment; Fig. Figure 17 is a perspective view illustrating an insulating rib according to a second embodiment; and Fig. 18 is a cross-sectional view along line F18-F18 of the in Fig. 17 illustrated structures. DETAILED DESCRIPTION OF THE INVENTION

[0008] The following descriptions illustrate embodiments with reference to the drawings. In the following description, assemblies with the same or similar functions are named using the same reference numerals. Redundant descriptions of these assemblies may be omitted. Note that the assembly described below does not limit the scope of the embodiment.

[0009] In the present disclosure, the terms are defined as follows. The term "connection" is not limited to a mechanical connection and may also include an electrical connection. That is, the term "connection" is not limited to a case in which two elements that are connection targets are directly connected and may include a case in which two elements that are connection targets are connected by another, intervening element. The term "reception" is not limited to the case in which the entire component is received, but may also include the case in which only a part of the component is received (a state in which the remaining part of the component protrudes). The term "facing" indicates that the virtual projection images of two target objects overlap when viewed from a certain direction.This means that the term "facing" is not limited to the case where two target objects are directly facing each other, but can also include the case where two target objects are facing each other in a state in which another element is located between the two target objects. "Parallel," "orthogonal," or "equal" can each include "substantially parallel," "substantially orthogonal," or "substantially equal," respectively.

[0010] In the present disclosure, a +X direction, a -X direction, a +Y direction, a -Y direction, a +Z direction, and a -Z direction are defined as follows. The +X direction is a direction from a first end 80e1 to a second end 80e2 of a metal plate 80, which is described later (see Fig. 11) The -X direction is a direction opposite to the +X direction. When the +X and -X directions are not distinguished, the directions are referred to simply as the "X direction" in the following. The +Y direction and the -Y direction are directions that intersect the X direction (for example, orthogonal to it). The +Y direction is a direction from a third end 80e3 to a fourth end 80e4 of the metal plate 80, which is described later (see Fig. 11) The -Y direction is a direction opposite to the +Y direction. When the +Y and -Y directions are not distinguished, the directions are simply referred to as the "Y direction" in the following. The +Z direction and the -Z direction are directions that intersect the X and Y directions (for example, are orthogonal to them). The +Z direction is a direction from the metal plate 80, which is described later, to a principal body MU (see Fig. 1) The -Z direction is the opposite of the +Z direction. When the +Z and -Z directions are not distinguished, the directions are simply referred to as the "Z direction" in the following. The Z direction is an example of a "first direction." The X direction is an example of a "second direction." The "second direction" is not limited to the X direction but can also be the Y direction or other directions.

[0011] If the X and Y directions are not distinguished, the directions can be referred to as the "horizontal direction" in the following. The Z direction can be referred to as the "vertical direction" in the following. The side with the +Z direction can be referred to as "top" and the side with the -Z direction as "bottom". However, these terms are descriptive and do not define a gravity direction of an electrical connection unit 1 (an installation position of the electrical connection unit 1). (First embodiment)<1. Structure of the electrical connection unit>

[0012] Fig. Figure 1 is a cross-sectional view illustrating an electrical connection unit 1 in a first embodiment. The electrical connection unit 1 is, for example, an in-vehicle device attached to a vehicle such as an electric vehicle (EV), a hybrid electric vehicle (HEV), or a plug-in hybrid electric vehicle (PHEV). The electrical connection unit 1 can be referred to, for example, as an "electrical junction box" or "junction box." However, the electrical connection unit 1 is not limited to a box-shaped device.

[0013] The electrical connection unit 1 contains, for example, a main body MU, a metal plate 80, an insulating film 91 (see Fig. 11), a plurality of heat transfer elements 92 and an insulating cover 93. <2nd main body>

[0014] First, the main body MU is described.

[0015] Fig. Figure 2 is a perspective view illustrating the main body MU. The main body MU is a section that performs a main function (for example, switching electrical connection states or overcurrent protection) of the electrical connection unit 1. In the present embodiment, the main body MU is divided into a plurality of subunits SU. The main body MU is formed by connecting a plurality of subunits SU. In the present embodiment, the main body MU contains three subunits SU (SUX, SUY, SUZ). Each subunit SU can be referred to as a "circuit structure body".

[0016] The subunit SUX has a primary electrical function. For example, the subunit SUX contains a plurality of electronic components 10X and a primary distribution board 40X. The majority of the electronic components 10X are electrically connected to the primary distribution board 40X.

[0017] The subunit SUY has a secondary electrical function. This secondary function differs from the primary function. For example, the subunit SUY contains a plurality of electronic components 10Y and a secondary circuit board 40Y. The majority of the electronic components 10Y are electrically connected to the secondary circuit board 40Y.

[0018] The subunit SUZ has a third electrical function. This third function is distinct from the first and second functions. For example, the subunit SUZ contains a plurality of electronic components 10Z and a third routing board 40Z. The majority of the electronic components 10Z are electrically connected to the third routing board 40Z.

[0019] In the present embodiment, the three subunits SUX, SUY, and SUZ are arranged such that they lie in the X direction. For example, subunit SUX is arranged on the +X direction side with respect to subunit SUY. Subunit SUX and subunit SUY are electrically connected via a plurality of coupling busbars 75 extending between the first routing board 40X and the second routing board 40Y. Subunit SUZ, on the other hand, is arranged on the -X direction side with respect to subunit SUY. Subunit SUZ and subunit SUY are electrically connected via a plurality of coupling busbars 75 (in Fig. (Figure 2 is only illustrated) connected, extending between the third routing board 40Z and the second routing board 40Y. The coupling busbar 75 is located on the side opposite the metal plate 80 with respect to the majority of the subunits SU.

[0020] In the present embodiment, the three routing boards 40X, 40Y, and 40Z, contained in the three subunits SUX, SUY, and SUZ, are arranged in the same plane. In other words, the three routing boards 40X, 40Y, and 40Z are arranged at the same height in the Z-direction. Thus, the three routing boards 40X, 40Y, and 40Z form one large routing board 40M.

[0021] In the present embodiment, the three subunits SUX, SUY, and SUZ have the same or a similar basic structure. Therefore, one subunit SU will be described in detail below as a representative example. If the subunits SUX, SUY, and SUZ are not distinguished, they will simply be referred to as "subunit SU." If the electronic components 10X, 10Y, and 10Z are not distinguished, they will simply be referred to as "electronic component 10." If the first routing board 40X, the second routing board 40Y, and the third routing board 40Z are not distinguished, they will simply be referred to as "routing board 40." A subunit SU contained within the three subunits SUX, SUY, and SUZ is an example of a "first subunit."Another subunit SU, which is contained within the three subunits SUX, SUY and SUZ, is, however, an example of a "second subunit".

[0022] Note that the main body MU need not be subdivided into a plurality of subunits SU, as in the example described above. That is, the main body MU can be formed from a plurality of electronic components 10 and a distribution board 40. Furthermore, the two or more subunits SU are not limited to subunits SU with different functions, but can also be subunits SU with the same function. <3. Subunit Structure>

[0023] Next, the structure of the subunit SU will be described.

[0024] Fig. Figure 3 is a perspective view to describe subunit SU. Fig. Figure 4 is a partially disassembled perspective view of subunit SU. Subunit SU contains, for example, a plurality of electronic components 10, a plurality of connection components 20 for connecting components, a plurality of connection components 30 for external connection, and a routing board 40. The connection components 20 and 30 are elements that form a power supply path in the vertical direction. The connection components 20 and 30 can be referred to as "vertical routing elements". <3.1 Electronic component and connection component for connecting components>

[0025] First, the electronic component 10 and the connection component 20 for connecting components are described.

[0026] Electronic component 10 is an electronic component attached according to a function required for subunit SU. Electronic component 10 could be, for example, a terminal, a fuse, a relay (for example, a mechanical relay or a solid-state relay), a capacitor, a branching component, any of several different sensors (for example, a current sensor or a voltage sensor), an electronic control unit, or an electronic component assembly in which two or more of these components are combined. Note that the type of electronic component 10 is not limited to the above example. Electronic component 10 could, for example, be a heat-generating component that produces heat when energy is supplied.Below, an electronic component of the first kind 10M and an electronic component of the second kind 10N are described as examples of the electronic component 10.

[0027] The connection component 20 is a component that electrically connects the electronic component 10 to the routing board 40. The connection component 20 forms part of a power supply path in the subunit SU. The connection component 20 is made of a metal (for example, copper or a copper alloy). The connection component 20 can be referred to as a "metal component". A first-type connection component 20M and a second-type connection component 20N are described below as examples of the connection component 20. <3.1.1 Electronic component of the first kind>

[0028] Fig. Figure 5 is a perspective view illustrating the electronic component of the first type 10M and the connection component of the first type 20M. The electronic component of the first type 10M is an electronic component in which a plurality of terminals 13 are arranged at one end of the electronic component 10M. The electronic component 10M includes, for example, a housing 11, a component body 12, a plurality of terminals 13, and a plurality of mounting sections 14. (Housing)

[0029] The housing 11 is an outer element that forms most of the outer shape of the electronic component 10M. The housing 11 is made of, for example, synthetic resin and has insulating properties. The housing 11 contains the component body 12. The housing 11 and the component body 12 can be formed from a single piece.

[0030] In the present embodiment, the housing 11 has an insulating rib 11a that projects horizontally (for example, in the X-direction) and extends in the Z-direction. The insulating rib 11a has, for example, a plate-like shape formed horizontally (for example, in the X-direction) and in the Z-direction. The insulating rib 11a extends, for example, over the entire length of the housing 11 in the Z-direction. The insulating rib 11a is arranged between the plurality of terminals 13 (a terminal 13A and a terminal 13B, which will be described later). The insulating rib 11a electrically isolates terminal 13A from terminal 13B. In the present embodiment, a portion of the insulating rib 11a is arranged between first sections 21 (which will be described later) of two connection components 20M that are connected to the electronic component 10M.The insulating rib 11a electrically isolates the first sections 21 of the two connecting components 20M connected to the electronic component 10M from each other. (Component body)

[0031] The component body 12 is a section that performs a main function of the electronic component 10M. For example, if the electronic component 10M is a relay, the component body 12 contains a switch (for example, a contact) that toggles between a conductive and a non-conductive state. For example, if the electronic component 10M is a fuse, the component body 12 contains a melting section that blows when an overcurrent flows. For example, if the electronic component 10M is a capacitor, the component body 12 contains a section that stores electrical charge. (Connection)

[0032] Terminal 13 is an electrical connection section exposed to the outside of the housing 11. Terminal 13 is electrically connected to the component body 12 inside the housing 11. In the present embodiment, the electronic component 10M includes one terminal 13A and one terminal 13B as the plurality of terminals 13. One of the terminals 13A and 13B is a terminal on the positive electrode side. The other of the terminals 13A and 13B is a terminal on the negative electrode side. One of the terminals 13A and 13B is an example of a "first terminal." The other of the terminals 13A and 13B is an example of a "second terminal."

[0033] In the present embodiment, terminal 13A and terminal 13B are provided at one end of the electronic component 10M in a horizontal direction (for example, in the X-direction). Terminal 13A and terminal 13B are arranged such that they lie in the horizontal direction (for example, in the Y-direction). Each terminal 13 has a mounting hole 13h to which a fastening element 71 (for example, a screw or a bolt), which will be described later, is attached. The mounting hole 13h is open in the horizontal direction (for example, in the X-direction). An inner circumferential surface of the mounting hole 13h of the electronic component 10M has a groove for the screw. (Fortification section)

[0034] Mounting section 14 is a section for fixing the electronic component 10M. Mounting section 14 has a mounting hole 14h to which a fastening element 112 (for example, a screw or a bolt; see Fig. 11), which will be described later. The mounting hole 14h is open in the Z-direction. Mounting hole 14h is an insertion hole through which the fastening element 112 passes. A fixing target for the fastening section 14 will be described later. <3.1.2 First-type connection component>

[0035] The connecting component of the first type 20M is a component that electrically connects the electronic component of the first type 10M to the routing board 40. In the present embodiment, the connecting component 20M electrically connects the electronic component 10M to a busbar 42 (see Fig. 8), which is contained in the routing board 40. In the present embodiment, a width L12 of the connecting component 20M in a longitudinal direction (for example, the X-direction) of the electronic component 10M is smaller than a width L11 of the electronic component 10M in the longitudinal direction. The connecting component 20M includes, for example, a first section 21 and a second section 22. (First section)

[0036] The first section 21 of the connecting component 20M is a section connected to terminal 13 of the electronic component 10M. The first section 21 is a plate-shaped or rectangular parallelepiped section extending in the Z-direction. The first section 21 extends in the Z-direction along one end (for example, an end in the X-direction) of the electronic component 10M. The first section 21 is a vertical section oriented in the Z-direction with respect to the routing board 40 (for example, with respect to a busbar 42, which will be described later). The first section 21 is horizontally adjacent (for example, in the X-direction) to the electronic component 10M.For example, the first section 21 borders the terminal 13 of the electronic component 10M in a horizontal direction (for example, in the X direction) and is connected to the terminal 13 of the electronic component 10M from a horizontal direction (for example, in the X direction).

[0037] The first section 21 of the connecting component 20M has a first mounting hole 21h through which the fastening element 71 (for example, a screw or a bolt) passes. The first mounting hole 21h is open in the horizontal direction (for example, in the X direction). The first section 21 has a recess 25 around the first mounting hole 21h. The recess 25 is a receiving section that accommodates a head of the fastening element 71 that has been inserted into the first mounting hole 21h. The fastening element 71, passing through the first mounting hole 21h, is connected to the mounting hole 13h of the terminal 13 of the electronic component 10M, so that the first section 21 is physically and electrically connected to the terminal 13 of the electronic component 10M. The first section 21 need not have the recess 25. (Second Section)

[0038] The second section 22 of the connection component 20M is a section that is connected to the busbar 42 (see Fig. 8) The second section 22 projects horizontally (for example, in the X direction) from the end of the first section 21 on the -Z direction side. The second section 22 is a plate section provided in the horizontal direction. The second section 22 borders the busbar 42 in the Z direction and is connected to the busbar 42 in the Z direction. The second section 22 of the connecting component 20M is attached to the fastening element 43 (for example, a screw or a bolt; see Fig. 8) is attached, projecting from the busbar 42 in the +Z direction, and is physically and electrically connected to the busbar 42. In the present embodiment, the second section 22 of the connecting component 20M has a second mounting hole 22h through which the fastening element 43 passes. The second mounting hole 22h is open in the Z direction. In the second section 22, the fastening element 43 passes through the second mounting hole 22h. A coupling element 44 (for example, a nut; see Fig. 3) is coupled to the tip of the fastening element 43, which passes through the second fastening hole 22h, thereby fixing the second section 22 to the busbar 42. In the present embodiment, the first section 21 and the second section 22 form an L-shaped connecting component 20M. <3.1.3 Second type electronic component>

[0039] Fig. Figure 6 is a perspective view illustrating the second-order electronic component 10N and the second-order connection component 20N. The second-order electronic component 10N is an electronic component in which two terminals 13 are arranged separately at both ends in the horizontal direction of the electronic component 10N. The electronic component 10N includes, for example, a housing 11, a component body 12, and a plurality of terminals 13. Note that among the assemblies of the electronic component 10N, those assemblies that have similar functions to the electronic component 10M are named with the same reference numerals. In this case, in the description of the electronic component 10N, "electronic component 10M" can be replaced by "electronic component 10N" in the description of the electronic component 10M described above.

[0040] In electronic component 10N, terminals 13A and 13B are arranged separately at both ends of the electronic component 10N in a horizontal direction (for example, in the X-direction). Each terminal 13 has a mounting hole 13h to which a fastener 72 (for example, a screw or a bolt), described later, is attached. The mounting hole 13h is open in the Z-direction. For example, the mounting hole 13h of electronic component 10N is an insertion hole through which the fastener 72 passes. One of the terminals 13A and 13B is an example of a "first terminal." The other of the terminals 13A and 13B is an example of a "second terminal." <3.1.4 Second type connection component>

[0041] The connecting component of the second type 20N is a component that electrically connects the electronic component of the second type 10N to the routing board 40. In the present embodiment, the connecting component 20N electrically connects the electronic component 10N to the busbar 42 (see Fig. 8), which is contained in the routing board 40. In the present embodiment, a width L12 of the connecting component 20N in the longitudinal direction (for example, in the X-direction) of the electronic component 10N is smaller than a width L11 of the electronic component 10N in the longitudinal direction. The connecting component 20N includes, for example, a first section 21, a second section 22, and a third section 23. (First section)

[0042] The first section 21 of the connecting component 20N is a section connected to terminal 13 of the electronic component 10N. The first section 21 is a rectangular parallelepiped section extending in the Z-direction. The first section 21 is a vertical section oriented in the Z-direction relative to the routing board 40 (for example, relative to the busbar 42). The first section 21 borders terminal 13 of the electronic component 10N in the Z-direction and is connected to terminal 13 of the electronic component 10N in the Z-direction. The first section 21 of the connecting component 20N has a first mounting hole 21h into which the fastening element 72 engages. The first mounting hole 21h is open in the Z-direction. An inner circumferential surface of the first mounting hole 21h of the connecting component 20N has a groove for the screw.The fastening element 72, which passes through the mounting hole 13h of the terminal 13 of the electronic component 10N, is connected to the mounting hole 21h of the first section 21, so that the first section 21 is physically and electrically connected to the terminal 13 of the electronic component 10N. (Second Section)

[0043] The second section 22 of the connecting component 20N is a section that is connected to the busbar 42 (see Fig. 8) The second section 22 projects horizontally (for example, in the X direction) from the end of the first section 21 on the -Z direction side. The second section 22 is a plate section provided in the horizontal direction. The second section 22 borders the busbar 42 in the Z direction and is connected to the busbar 42 in the Z direction. The second section 22 of the connecting component 20N is attached in the Z direction to the fastening element 43 (for example, a screw or a bolt; see Fig. 8) is attached, projecting from the busbar 42 in the +Z direction, and is physically and electrically connected to the busbar 42. In the present embodiment, the second section 22 of the connecting component 20N has a second mounting hole 22h through which the fastening element 43 passes. The second mounting hole 22h is open in the Z direction. In the second section 22, the fastening element 43, which will be described later, passes through the second mounting hole 22h. A coupling element 44 (for example, a nut; see Fig. 3) is coupled to the tip of the fastening element 43, which passes through the second fastening hole 22h, thereby fixing the second section 22 to the busbar 42. (Third Section)

[0044] The third section 23 is a standing wall (side wall) extending horizontally in the +Z direction from both ends of the second section 22. The third section 23 is a wall provided in the Z direction. The third section 23 is connected to the first section 21 and also to the second section 22. For example, the third section 23 extends diagonally, increasing in the X direction while running in the -Z direction. The third section 23 can be provided in the connection component 20M described above. The connection component 20N, however, does not need to include the third section 23. <3.2 Connection component for external connection>

[0045] Next, the connection component 30 for the external connection will be described.

[0046] Fig. Figure 7 is a perspective view illustrating the connection component 30 for the external connection. The connection component 30 is a component that electrically connects an external busbar 76 to the distribution board 40. In the present embodiment, the connection component 30 electrically connects the external busbar 76 to the busbar 42 contained in the distribution board 40 (see Figure 7). Fig. 8) The external connecting busbar 76 is electrically connected to an external device. In the present disclosure, the “external device” is an electrical device that exists outside the electrical connecting unit 1. The external device is, for example, a battery attached to a vehicle or an inverter for driving a motor of the vehicle, but is not limited to these examples. The connecting component 30 includes, for example, a first section 31, a second section 32, and a third section 33. (First section)

[0047] The first section 31 is a section connected to the external busbar 76. The first section 31 is a rectangular parallelepiped section extending in the Z-direction. The first section 31 is a vertical section oriented in the Z-direction relative to the routing board 40 (for example, relative to the busbar 42). The first section 31 borders the external busbar 76 in the Z-direction and is connected to the external busbar 76 in the Z-direction. The first section 31 has a first mounting hole 31h through which a fastener 73 (for example, a screw or a bolt) passes. The first mounting hole 31h is open in the Z-direction. An inner circumferential surface of the first mounting hole 31h has a groove for the screw.The fastening element 73, which passes through the mounting hole 76h of the external connecting busbar 76, is coupled to the mounting hole 31h of the first section 31, so that the first section 31 is physically and electrically connected to the external connecting busbar 76. (Second Section)

[0048] The second section 32 is a section that is connected to the busbar 42 (see Fig. 8) The second section 32 projects horizontally (for example, in the X direction) from the end of the first section 31 on the -Z direction side. The second section 32 is a plate section provided in the horizontal direction. The second section 32 borders the busbar 42 in the Z direction and is connected to the busbar 42 in the Z direction. The second section 32 is attached in the Z direction to the fastening element 43 (for example, a screw or a bolt; see Fig. 8) is attached, projecting from the busbar 42 in the +Z direction, and is physically and electrically connected to the busbar 42. In the present embodiment, the second section 32 has a second mounting hole 32h through which the mounting element 43 passes. The second mounting hole 32h is open in the Z direction. In the second section 32, the mounting element 43, which will be described later, passes through the second mounting hole 32h. The coupling element 44 (for example, a nut; see Fig. 3) is coupled to the tip of the fastening element 43, which passes through the second fastening hole 32h, thereby fixing the second section 32 to the busbar 42. (Third Section)

[0049] The third section 33 is a standing wall (side wall) extending horizontally in the +Z direction from both ends of the second section 32. The third section 33 is a wall provided in the Z direction. The third section 33 is connected to the first section 31 and also to the second section 32. For example, the third section 33 extends diagonally to increase in the X direction (or Y direction) while running parallel in the -Z direction. The connecting component 30 does not need to include the third section 33. <3.3 Installation board>

[0050] Next, the routing board 40 will be described.

[0051] Fig. Figure 8 is a perspective view illustrating the routing board 40. The routing board 40 is a component that forms at least part of a power supply path between the plurality of electronic components 10 and / or at least part of a power supply path between the electronic component 10 and an external device. In the present disclosure, the “routing board” denotes a board-like routing structure. The term “board-like” denotes a plate-like shape along a plane when viewed as a whole, irrespective of any fine detail.In the present disclosure, the term "plate-shaped," "sheet-shaped," or "flat" shape is not limited to the case where it is completely flat and may include a case in which a fixing structure, a rib, or the like, projecting in the Z-direction, is partially present, a case in which a non-uniform shape, following the thickness of the busbar, is present on the surface, and the like. In the present embodiment, the routing board 40 has a plate-shaped form in the X and Y directions.

[0052] The distribution board 40 includes, for example, a base plate 41, one or more (for example, a plurality of) busbars 42, and a plurality of fastening elements 43. In the present embodiment, the base plate 41 and the plurality of busbars 42 are integrated by insert forming. For example, the distribution board 40 is formed as a single element by insert forming the busbar 42 with the base plate 41 after the fastening element 43 has been fixed to the busbar 42. That is, the busbar 42 is integrated with the base plate 41 without the use of a fastening element such as a screw or bolt. Note that the distribution board 40 can also be formed by a different structure instead of insert forming. A modification example in which the distribution board 40 is formed by a different structure is described later.

[0053] Fig. Figure 9 is a partially separated perspective view of the routing board 40. For the sake of simplicity, the base plate 41, the busbar 42 and the fastening element 43 are described below with reference to the drawings in which the routing board 40 is partially separated. (Base plate)

[0054] The base plate 41 is a retaining element that holds the majority of the busbars 42, arranged horizontally at intervals, in one piece. The base plate 41 is made, for example, of synthetic resin and has insulating properties. The base plate 41 electrically insulates the majority of the busbars 42 from each other. The base plate 41 is an example of a "base element." The base plate 41 can also be referred to as an "insulating substrate." The base plate 41 contains, for example, a flat surface section 51 and a plurality of fixing sections 52. The fixing section 52 will be described later.

[0055] The flat surface section 51 is a section formed in the base plate 41 in the form of a plate. The flat surface section 51 has the shape of a plate formed in the horizontal direction. The flat surface section 51 forms a main section of the base plate 41. The flat surface section 51 forms an (insulating) base section of the base plate 41. In the present embodiment, the flat surface section 51 extends over the entire width in the X direction of the base plate 41 and over the entire width in the Y direction of the base plate 41, with the exception of four corner sections of the base plate 41.

[0056] The flat surface section 51 has a first surface 51a and a second surface 51b. The first surface 51a is a surface oriented in the +Z direction. The first surface 51a is a flat surface provided in the horizontal direction. The first surface 51a faces the majority of electronic components 10 and is adjacent to the insulating cover 93 (see Fig. 1) facing the electrical connection unit 1. The second surface 51b is located on the side opposite the first surface 51a. The second surface 51b is a surface oriented in the -Z direction. The second surface 51b is a flat surface provided in the horizontal direction. The second surface 51b faces the metal plate 80 (see Fig. 1) One thickness direction (plate thickness direction) of the flat surface section 51 is the Z-direction.

[0057] The flat surface section 51 has, for example, one or more (e.g., a plurality of) receiving sections 55 in which the busbars 42 are each received. The plurality of receiving sections 55 are spaced apart from one another in the X or Y direction. Each of the receiving sections 55 is, for example, a through-hole that penetrates the flat surface section 51 in the Z direction. Note that the receiving section 55 can be a recess provided on the first surface 51a or the second surface 51b of the flat surface section 51 and is recessed in the Z direction, instead of a through-hole.In the present disclosure, the phrase “the receiving section penetrates the flat surface section in the first direction (Z-direction)” may include a case in which part of the total length of the receiving section 55 penetrates the flat surface section 51 in the Z-direction (for example, the remaining part of the receiving section 55 may be a recess in the Z-direction or be provided within the base plate 41 and not be exposed to the outside of the base plate 41).Similarly, in the present disclosure, the phrase “the receiving section is recessed in the first direction (Z direction)” may include a case in which part of the total length of the receiving section 55 is recessed in the Z direction (for example, a remaining part of the receiving section 55 may be a through hole penetrating the flat surface section 51 in the Z direction, or it may be provided within the base plate 41 and is not exposed to the outside of the base plate 41).

[0058] Each receiving section 55 has an outer shape that, viewed from the Z-direction, corresponds to the shape of the busbar 42 to be received. In the present embodiment, the flat surface section 51, for example, includes five receiving sections 55A, 55B, 55C, 55D, and 55E as the plurality of receiving sections 55. Receiving section 55A is provided to correspond to a busbar 42A, which will be described later, and receives the busbar 42A. Receiving section 55B is provided to correspond to a busbar 42B, which will be described later, and receives the busbar 42B. Receiving section 55C is provided to correspond to a busbar 42C, which will be described later, and receives the busbar 42C. Receiving section 55D is provided to correspond to a busbar 42D, which will be described later, and receives the busbar 42D.The receiving section 55E is provided in such a way that it corresponds to a busbar 42E, which will be described later, and accommodates the busbar 42E. (busbar)

[0059] The busbar 42 is a routing element (electrical connection element) contained in the routing board 40. The busbar 42 is, for example, a routing element for electrically connecting a plurality of electronic components 10. Alternatively, the busbar 42 can also be a routing element for connecting the electronic component 10 to an external device. The busbar 42 is made of a metal (for example, copper or a copper alloy) and is conductive. In the present embodiment, the routing board 40 contains, for example, five busbars 42A, 42B, 42C, 42D, and 42E as a plurality of busbars 42. The five busbars 42A, 42B, 42C, 42D, and 42E are arranged such that they are positioned at intervals in the horizontal direction. The five busbars 42A, 42B, 42C, 42D and 42E contain sections that are arranged in the same plane.The five busbars 42A, 42B, 42C, 42D and 42E are held by the flat surface section 51 of the base plate 41.

[0060] At least a portion of each busbar 42 has a plate-like shape extending horizontally. At least a portion of each busbar 42 is received in the receiving section 55 and extends along the flat surface section 51. That is, at least a portion of each busbar 42 extends along the first surface 51a of the flat surface section 51. At least a portion of each busbar 42 extends horizontally within the receiving section 55. In the present embodiment, each busbar 42 has a plate-like shape extending horizontally over its entire length. Each busbar 42 is received in the receiving section 55 over its entire length and extends along the flat surface section 51.A section of each busbar 42 that is received into the receiving section 55 and extends along the flat surface section 51 may be referred to below as the "plate section 42p". The busbar 42 is an element that forms a horizontal power supply path. The busbar 42 may also be referred to as the "horizontal routing element".

[0061] Fig. Figure 10 is a top view to illustrate the routing board 40. The board section 42p of each busbar 42 has, for example, a first connecting section 61, a second connecting section 62 and an extending section 63.

[0062] The first connection section 61 is a section connected to a connection component 20 (hereinafter referred to as "first connection component 20"). The first connection component 20 is a connection component that connects an electronic component 10 (hereinafter referred to as "first electronic component 10") to the busbar 42. The first connection section 61 is a section of the busbar 42 that overlaps the first connection component 20 when viewed from the Z-direction. The first connection section 61 is adjacent to the first connection component 20 in the Z-direction and is connected to the first connection component 20 in the Z-direction.

[0063] The second connection section 62 is a section that is connected to another connection component 20 (hereinafter referred to as "second connection component 20"). The second connection component 20 is a connection component that connects another electronic component 10 (hereinafter referred to as "second electronic component 10"), which is contained within the majority of the electronic components 10, to the busbar 42. The second connection section 62 is a section of the busbar 42 that overlaps the second connection component 20 when viewed from the Z-direction. The second connection section 62 is adjacent to the second connection component 20 in the Z-direction and is connected to the second connection component 20 in the Z-direction.

[0064] Note that the second connection section 62, instead of the example above, can also be a section connected to another connection component 30 (hereinafter referred to as "second connection component 30"). The connection component 30 is a connection component for connecting an external device to the busbar 42. In this case, the second connection section 62 is a section of the busbar 42 that overlaps the second connection component 30 as viewed from the Z-direction. The second connection section 62 is adjacent to the second connection component 30 in the Z-direction and is connected to the second connection component 30 in the Z-direction.

[0065] The second connection section 62 can be a section that is in contact with the coupling busbar 75 in order to be connected to a different subunit SU instead of the connection components 20 and 30. In this case, the second connection section 62 is a section of the busbar 42 that overlaps the coupling busbar 75 when viewed from the Z-direction. The second connection section 62 is adjacent to the coupling busbar 75 in the Z-direction and is connected to the coupling busbar 75 from the Z-direction.

[0066] The extending section 63 extends from the first connecting section 61 in the X-direction or in the Y-direction. The extending section 63 is provided between the first connecting section 61 and the second connecting section 62. The extending section 63 extends over the first connecting section 61 and the second connecting section 62. The extending section 63 connects the first connecting section 61 with the second connecting section 62.

[0067] In the present embodiment, the first connecting section 61, the second connecting section 62, and the extending section 63 have a plate-like shape formed in the horizontal direction. In the present embodiment, each busbar 42 is received in the receiving section 55 at least above the first connecting section 61 and the second connecting section 62 and extends along the flat surface section 51. For example, the first connecting section 61, the second connecting section 62, and the extending section 63 are received in the receiving section 55 and extend along the flat surface section 51.

[0068] In the present embodiment, the extending sections 63 of some busbars 42 are received in the receiving section 55 such that they extend over both sides of a region R, specifically through the region R that overlaps the electronic component 10 when viewed from the Z direction. For example, the extending section 63 extends linearly in the X direction. The extending section 63 extends over a region R that overlaps the electronic component 10 when viewed from the Z direction, over both the +X-direction and -X-direction sides of region R. That is, the busbar 42 is received in the receiving section 55 in such a way that it can easily be routed along a better path (for example, a path with a shorter distance) without being obstructed by the presence of the electronic component 10.

[0069] The one or more busbars 42 may, in addition to the first connecting section 61, the second connecting section 62, and the extending section 63, have an extension 64. The extension 64 is a section in which the busbar 42 extends to increase a heat dissipation area and / or to increase heat storage capacity (heat absorption). The extension 64 is a section that is not used for electrical connections. For example, the extension 64 is located on the side opposite the extending section 63 with respect to the first connecting section 61 (or the second connecting section 62). The extension 64 has a plate-like shape formed in the horizontal direction. The extension 64 is received in the receiving section 55 and extends along the flat surface section 51.The extension 64 extends to the region R, which overlaps the electronic component 10 as seen from the Z direction, and has an end 42e1 of the busbar 42 at a position which overlaps the electronic component 10 as seen from the Z direction.

[0070] Some routing examples for the busbar 42 are described below. The majority of electronic components 10 contain three electronic components 10A, 10B, and 10C. Electronic components 10A and 10B are, for example, type 10M. Electronic component 10C is, for example, type 10N. Note that the type of electronic component 10 is not limited to the example above. The majority of connection components 20 contain six connection components 20A, 20B, 20C, 20D, 20E, and 20F. The majority of connection components 30 contain two connection components 30A and 30B. The majority of coupling busbars 75 contain two coupling busbars 75A and 75B. The majority of the external coupling busbars 76 contain two external coupling busbars 76A and 76B. (First installation example)

[0071] First, a routing example for busbar 42A is described. Busbar 42A has a first connection section 61, a second connection section 62, and an extending section 63. Viewed from the Z-direction, the first connection section 61 is located in the +X direction relative to electronic component 10A. The first connection section 61 is electrically connected to terminal 13A of electronic component 10A via connection component 20A, which is the first connection component 20. Viewed from the Z-direction, the second connection section 62 is located in the -X direction relative to electronic component 10A. The second connection section 62 is electrically connected to another subunit SU via the coupling busbar 75A.

[0072] Extending section 63 is received in receiving section 55 such that, viewed from the Z-direction, it extends over both sides of region R through region R, which overlaps electronic component 10A. For example, extending section 63 extends linearly in the X-direction. Extending section 63 extends over region R, which overlaps electronic component 10A viewed from the Z-direction, over the +X-direction side and the -X-direction side of region R. Busbar 42A is an example of a "first busbar." Receiving section 55A, which receives busbar 42A, is an example of a "first receiving section." Busbar 42A is, for example, a busbar contained in the positive electrode line PL in electrical connection unit 1. (Second installation example)

[0073] Next, an installation example for busbar 42B is described. Busbar 42B has the first connection section 61, the second connection section 62, the extending section 63, and the extension 64. The first connection section 61 is electrically connected to terminal 13B of electronic component 10A via connection component 20B, which is the first connection component 20. The second connection section 62 is electrically connected to the external connection busbar 76A via connection component 30A, which is the second connection component 30. The extension 64 extends to region R, which overlaps electronic component 10A as viewed from the Z-direction, and has an end 42e1 of busbar 42 at a position that overlaps electronic component 10A.Similar to busbar 42A, busbar 42B can also have an extending section 63 that, viewed from the Z direction, extends through region R, which overlaps electronic component 10, and across both sides of region R. Busbar 42B is another example of a "first busbar." The receiving section 55B, which receives busbar 42B, is another example of a "first receiving section." Busbar 42B is, for example, a busbar contained in the positive electrode line PL in electrical connection unit 1. (Third laying example)

[0074] Next, an installation example for busbar 42C is described. Busbar 42C contains the first connecting section 61, the second connecting section 62, the extending section 63, and the extension 64. The first connecting section 61 is electrically connected to terminal 13B of electronic component 10B via connecting component 20C, which is the first connecting component 20. The second connecting section 62 is electrically connected to another subunit SU via coupling busbar 75B. The extension 64 extends to region R, which overlaps electronic component 10B as viewed from the Z-direction, and has an end 42e1 of busbar 42 at a position that overlaps electronic component 10B as viewed from the Z-direction. Busbar 42C is another example of a "first busbar".The receiving section 55C, which receives the busbar 42C, is another example of a "first receiving section". The busbar 42C is, for example, a busbar contained in the negative electrode line NL in the electrical connection unit 1. (Fourth laying example)

[0075] Next, an installation example for busbar 42D is described. Busbar 42D has a first connection section 61, a second connection section 62, and an extending section 63. The first connection section 61 is electrically connected to terminal 13A of electronic component 10B via connection component 20D, which is the first connection component 20. The second connection section 62 is electrically connected to terminal 13B of electronic component 10C via connection component 20E, which is the second connection component 20. Busbar 42D is another example of a "first busbar." The receiving section 55D, in which busbar 42D is received, is another example of a "first receiving section."For example, the busbar 42D is a busbar that is included in the negative electrode line NL in the electrical connection unit 1. (Fifth laying example)

[0076] Next, an installation example for busbar 42E is described. Busbar 42E has a first connection section 61, a second connection section 62, and an extending section 63. The first connection section 61 is electrically connected to terminal 13A of electronic component 10C via connection component 20F, which is the first connection component 20. The second connection section 62 is electrically connected to the external connection busbar 76B via connection component 30B, which is the second connection component 30. Busbar 42E is another example of a "first busbar." The receiving section 55E, in which busbar 42E is received, is another example of a "first receiving section."For example, the busbar 42E is a busbar that is contained in the negative electrode line NL in the electrical connection unit 1. (fastening element)

[0077] Next, the fastener 43 will be installed. Fig. 9 described. The fastening element 43 is a component for fixing the busbar 42 to a connection target component (the connection component 20, the connection component 30, the coupling busbar 75 or a connection component 100) of the busbar 42. The fastening element 43 is, for example, a crimping bolt fixed to the busbar 42. The fastening element 43 is, for example, a “fastening section”.

[0078] In the present embodiment, the first connecting section 61 and the second connecting section 62 of the busbar 42 each have a through-hole 42h. The through-hole 42h penetrates the busbar 42 in the Z-direction. The fastening element 43 is, for example, a bolt with a shank 43a and a head 43b. A circumferential surface of the shank 43a has a groove for the screw. The head 43b has a diameter larger than that of the shank 43a. The head 43b of the fastening element 43 is riveted and fixed to the busbar 42 in such a way that the shank 43a passes through the through-hole 42h of the busbar 42. With this fixing, the fastening element 43 is electrically and physically connected to the busbar 42, in a state in which the shaft 43a protrudes from the through hole 42h of the busbar 42 in the +Z direction.The fastening element 43 is not limited to fixing by riveting, but can also be fixed to the busbar 42 by welding or other methods.

[0079] In the present embodiment, the connecting component 20, having previously been fixed to the electronic component 10 via the fastening element 72 or the fastening element 71, is attached to the fastening element 43 in the Z-direction. For example, in the connecting component 20, the shaft section 43a of the fastening element 43 is inserted into the second fastening hole 22h of the second section 22. The coupling element 44 (for example, a nut) is connected to the shaft section 43a of the fastening element 43, which protrudes from the second fastening hole 22h of the second section 22 of the connecting component 20. The coupling element 44 is, for example, attached to the shaft 43a in the Z-direction. This coupling secures the second section 22 of the connecting component 20 to the fastening element 43. <4. Metal plate, insulating film, heat transfer element and insulating cover>

[0080] Next, the metal plate 80, the insulating film 91, the heat transfer element 92 and the insulating cover 93 are described. <4.1 Metal plate>

[0081] Fig. Figure 11 is a partially unfolded perspective view of the electrical connection unit 1. The metal plate 80 is an element for ensuring the rigidity of the electrical connection unit 1 and for improving its heat dissipation properties. The metal plate 80 is made of a metal (for example, aluminum or an aluminum alloy). The metal plate 80 can also be referred to as a "rigid element".

[0082] The metal plate 80 is rectangular in the X-direction when viewed from the Z-direction. The metal plate 80 has a first end 80e1, a second end 80e2, a third end 80e3, and a fourth end 80e4. The first end 80e1 and the second end 80e2 are a pair of ends of the metal plate 80 in the longitudinal direction and are separated in the X-direction. The third end 80e3 and the fourth end 80e4 are a pair of ends of the metal plate 80 in the lateral direction, separated from each other in the Y-direction. The metal plate 80 includes, for example, a flat surface section 81, a plurality of fixing sections 82, and a plurality of fixing sections 83.

[0083] The flat surface section 81 is a section formed in the metal plate 80 in a plate-like shape. The flat surface section 81 has a plate-like shape formed in the horizontal direction. The flat surface section 81 forms a main section of the metal plate 80. The flat surface section 81 forms a base section (metal base section) of the metal plate 80. In the present embodiment, the flat surface section 81 has a size that covers the three subunits SU from below. The flat surface section 81 faces the laying plates 40 of the three subunits SU. In the present embodiment, the metal plate 80 has a gap S1 formed between the metal plate 80 and the second surface 51b of the flat surface section 51 of each subunit SU (see Fig. 13) and faces the second surface 51b of the flat surface section 51 of each subunit SU. The gap S1 is an example of a ‘first gap’.

[0084] The fixing section 82 is a section for fixing the base plate 41 of each subunit SU to the metal plate 80. The fixing section 82 is provided in a position that, viewed from the Z-direction, corresponds to the fixing section 52 of the base plate 41 of each subunit SU. The fixing section 82 is a cylindrical or prismatic projection that extends in the +Z direction from the flat surface section 81 of the metal plate 80.

[0085] The fixing section 83 is a fixing section for directly fixing the electronic component 10 of each subunit SU to the metal plate 80 without the intermediate base plate 41. The fixing section 83 is provided in a position corresponding to the mounting section 14 of the electronic component 10 of each subunit SU when viewed from the Z-direction. The fixing section 83 is a cylindrical or prismatic projection that extends from the flat surface section 81 in the +Z direction. <4.2 Insulating film>

[0086] The insulating foil 91 is an insulator for the electrical insulation of the metal plate 80 and the busbar 42 of each subunit SU. The insulating foil 91 consists, for example, of a synthetic resin such as polyester or polyimide and has insulating properties. Viewed from the Z-direction, the insulating foil 91 has a rectangular shape. The insulating foil 91 has a sheet-like shape formed in the horizontal direction. The insulating foil 91 is arranged between the flat surface section 81 of the metal plate 80 and the busbar 40 of each subunit SU. For example, the insulating foil 91 is arranged between the flat surface section 81 of the metal plate 80 and the majority of the heat transfer elements 92.

[0087] In the present embodiment, the insulating film 91 is attached to the flat surface section 81 of the metal plate 80. The insulating film 91 has a notch or opening to bypass the fixing section 82 and the fixing section 83 of the metal plate 80. Note that instead of the above example, the insulating film 91 can also be provided between the routing board 40 of each subunit SU and the plurality of heat transfer elements 92. Note that if the heat transfer element 92 has an insulating property and the necessary insulating property is ensured by the heat transfer element 92, the insulating film 91 can be omitted. <4.3 Heat transfer element>

[0088] The heat transfer element 92 is an element for transferring the heat generated by the electronic component 10 at the time of energy supply and / or the heat generated by the busbar 42 itself at the time of energy supply (Joule heat) to the metal plate 80. The heat transfer element 92 is, for example, a heat transfer film (for example, a thermally conductive silicone film) that is elastic. The heat transfer element 92 is made, for example, of a material with a higher thermal conductivity than that of the base plate 41. However, the heat transfer element 92 is not limited to the above example, but can also be a heat transfer element made of a thermally conductive gel or another material.

[0089] Fig. Figure 12 is a bottom view illustrating the routing board 40. In the present embodiment, the majority of the heat transfer elements 92 are partially provided in the routing board 40. For example, the majority of the heat transfer elements 92 are arranged in positions that overlap a portion of the busbar 42 when viewed from the Z-direction. More precisely, the majority of the heat transfer elements 92 are arranged in positions that overlap a portion of the busbar 42 near the electronic component 10 (for example, electronic components 10A and 10B) when viewed from the Z-direction. In the present embodiment, the majority of the heat transfer elements 92 are arranged in positions that overlap the connecting component 20 when viewed from the Z-direction.

[0090] Fig. 13 is a cross-sectional view along line F13-F13 of the in Fig. The structure is illustrated in Figure 10. In the present embodiment, the heat transfer element 92 is arranged between the metal plate 80 and the busbar 42. The heat transfer element 92 transfers the heat transferred from the electronic component 10 to the busbar 42 and / or the heat generated by the busbar 42 from the busbar 42 to the metal plate 80. In this drawing, the electronic component 10 is arranged at a predetermined distance in the Z-direction from the base plate 41 by appropriately adjusting a dimension in the Z-direction of a fixing section 83, which will be described later, or by arranging a spacer or the like adjacent to the fixing section 83 in the Z-direction.

[0091] In the present embodiment, part of the heat transfer element 92 is in contact with the busbar 42 at a position that overlaps the connecting component 20 when viewed from the Z-direction. In this case, the heat transfer element 92 easily transfers the heat transferred from the terminal 13 of the electronic component 10 to the connecting component 20 from the connecting component 20 via the busbar 42 to the metal plate 80.

[0092] In the present embodiment, part of the heat transfer element 92 is arranged in a position that overlaps the head 43b of the fastening element 43 when viewed from the Z-direction and is in contact with the head 43b of the fastening element 43. In this case, the heat transfer element 92 easily transfers the heat transferred from the terminal 13 of the electronic component 10 to the connecting component 20 from the fastening element 43 to the metal plate 80.

[0093] In the present embodiment, part of the heat transfer element 92 is in contact with the busbar 42 at a position that overlaps the electronic component 10 when viewed from the Z-direction. In this case, the heat transfer element 92 readily transfers the heat transferred from the electronic component 10 to the busbar 42 from the busbar 42 to the metal plate 80. In the Fig. In the illustrated example 13, the upper surface of the busbar 42 is in contact with the electronic component 10, and thus the busbar 42 is thermally connected to the electronic component 10. Note that the busbar 42 can be thermally connected to the electronic component 10 at the extending section 63 or at the extension 64. <4.4 Insulating cover>

[0094] Referring to Fig. Section 1 describes the insulating cover 93. The insulating cover 93 prevents the main body MU from coming into contact with the energy supply path. The insulating cover 93 is made, for example, of a synthetic resin and has insulating properties. The insulating cover 93 has, for example, a box-shaped form that is open on the -Z side. The insulating cover 93 has a plurality of vent holes 93h. The insulating cover 93 is attached to the metal plate 80 in the Z direction. Note that the insulating cover 93 is not limited to a box-shaped form, but can also be a sheet-like element that covers the energy supply path of the main body MU. <5. Busbar exposure structure>

[0095] Next, an exposure structure of busbar 42 is described. <5.1 Exposure structure on the upper surface side of the busbar>

[0096] First, an exposure structure is created on the upper surface side of the busbar 42 with reference to Fig. 8 described. In the present embodiment, at least a part of the extending section 63 of the busbar 42 is exposed towards the outside of the base plate 41 on the upper surface side (the first surface side 51a of the flat surface section 51). For example, the extending section 63 of the busbar 42 is exposed towards the outside of the base plate 41 on the upper surface side at least in a part of region R (see Fig. 10) exposed, overlapping the electronic component 10 as seen from the Z direction.

[0097] In the present embodiment, the busbar 42 is received in the receiving section 55 at least over its entire length between the first connecting section 61 and the second connecting section 62 and extends along the first surface 51a of the flat surface section 51. The busbar 42 is exposed to the outside on the upper surface side of the base plate 41 at least over its entire length between the first connecting section 61 and the second connecting section 62.

[0098] In the present embodiment, the busbar 42 is received in the receiving section 55 over its entire length and extends along the first surface 51a of the flat surface section 51. The busbar 42 is exposed on its upper surface side over its entire length towards the outside of the base plate 41.

[0099] As in Fig. As illustrated in Figure 13, at least part of the extending section 63 of the busbar 42 is exposed not only on the upper surface side but also on the lower surface side (second surface side 51b) towards the outside of the base plate 41. For example, the busbar 42 is exposed along its entire length on the lower surface side towards the outside of the base plate 41.

[0100] As in Fig. As illustrated in Figure 14, the first connecting section 61, which is electrically connected to the first electronic component 10, projects from the first surface 51a in the first direction (Z-direction) beyond the receiving section 55. In other words, the first surface 51a is recessed in the Z-direction with respect to the first connecting section. In this case, part of the lateral circumferential surface 42CS of the busbar 42 is exposed towards the outside of the base plate 41. The lateral circumferential surface 42CS is oriented in a direction that intersects the first direction.

[0101] The thickness of the busbar 42 in the first direction (Z-direction) can be greater than the thickness of the first surface 51a of the base plate 41 in the Z-direction. This allows the cross-sectional area of ​​the busbar 42 to be increased compared to a case where the thickness of the busbar 42 and the thickness of the first surface 51a of the base plate 41 are equal. A higher rated current can then be used for the electrical connection unit 1 with the busbar 42. The rated current is obtained by substituting a cross-sectional area into the definition of an upper limit of a current density with respect to a rated current (“current density of a web-like conductor” according to JIS C 8480:2016). As described above, since part of the lateral circumferential surface 42CS is exposed to the outside of the base plate 41, the heat dissipation performance of the busbar 42 is improved.

[0102] It should be noted that the in Fig. The details described in section 14 can be applied to the second connection component 20 instead of the first connection component 20. As described above, the second connection component 20 electrically connects the second electronic component 10 or an external device to the busbar 42.

[0103] It should be noted that the in Fig. The details described in section 14 can be applied to the coupling busbar 75 instead of the first connecting component 20. As described above, the coupling busbar 75 electrically connects the busbars of the majority of subunits (e.g., the three subunits SUX, SUY, and SUZ) to the busbars 42. In this case, a contact surface between the coupling busbar 75 and the busbar 42 protrudes from the first surface 51a in the first direction (Z-direction). <5.2 Exposure structure on the lower surface side of the busbar>

[0104] The exposed structure on the lower surface side of busbar 42 is described with further reference to Fig. 13 described. In the present embodiment, the plate section 42p of the busbar 42 includes an exposed section 42u, which is exposed towards the outside of the base plate 41 on the lower surface side (the second surface side 51b of the flat surface section 51). In the present embodiment, the exposed section 42u of the busbar 42 extends over the entire length of the busbar 42. In the present embodiment, the heat transfer element 92 is arranged between the exposed section 42u of the busbar 42 and the metal plate 80. For example, the heat transfer element 92 is in contact with the exposed section 42u of the busbar 42.

[0105] In the present embodiment, at least a portion of the exposed section 42u of the busbar 42 is provided in a region that overlaps the connecting component 20 when viewed from the Z-direction. At least a portion of the heat transfer element 92 overlaps the exposed section 42u of the busbar 42 in a region that overlaps the connecting component 20 when viewed from the Z-direction. For example, at least a portion of the heat transfer element 92 is in contact with the exposed section 42u of the busbar 42 in a region that overlaps the connecting component 20 when viewed from the Z-direction.

[0106] In the present embodiment, the exposed section 42u of the busbar 42 includes a first section 42ua, which is arranged in a region that overlaps the connecting component 20 as seen from the Z direction, and a second section 42ub, which is arranged in a region that overlaps the electronic component 10 as seen from the Z direction.

[0107] The heat transfer element 92 comprises a first heat transfer section 92a and a second heat transfer section 92b. The first heat transfer section 92a overlaps the first section 42ua of the exposed section 42u of the busbar 42 in a region that overlaps the connecting component 20 as viewed from the Z direction. For example, the first heat transfer section 92a is in contact with the first section 42ua of the exposed section 42u of the busbar 42. On the other hand, the second heat transfer section 92b overlaps the second section 42ub of the exposed section 42u of the busbar 42 in a region that overlaps the electronic component 10 as viewed from the Z direction. For example, the second heat transfer section 92b is in contact with the second section 42ub of the exposed section 42u of the busbar 42.

[0108] As described above, at least part of the extending section 63 of the busbar 42 is exposed not only on the lower surface but also on the upper surface (first surface 51a) towards the outside of the base plate 41. For example, the busbar 42 is exposed along its entire length on the upper surface towards the outside of the base plate 41. For example, the second section 42ub of the exposed section 42u of the busbar 42 is exposed not only on the lower surface but also on the upper surface towards the outside of the base plate 41 and faces the electronic component 10. <6. Three-dimensional busbar routing structure>

[0109] Next, a three-dimensional routing structure CS of busbar 42 is described.

[0110] Fig. Figure 15 is a perspective view illustrating the three-dimensional laying structure CS of busbar 42. Fig. Figure 16 is a top view illustrating the three-dimensional routing structure CS of the busbar 42. The three-dimensional routing structure CS contains a busbar 42F, a busbar 42G, a busbar 42H, and a busbar 42I, as a plurality of busbars 42. Furthermore, the three-dimensional routing structure CS contains a plurality of connecting components 100. The three-dimensional routing structure CS contains a coupling busbar 75C and a coupling busbar 75D, as a plurality of coupling busbars 75.

[0111] Busbar 42F and busbar 42G are examples of busbars 42 contained in subunit SUY. The flat surface section 51 of the base plate 41 of subunit SUY contains a receiving section 55F and a receiving section 55G, as the plurality of receiving sections 55. Busbar 42F is received in receiving section 55F and extends along flat surface section 51. Busbar 42G is received in receiving section 55G and extends along flat surface section 51. Busbar 42F is an example of a "first busbar." Receiving section 55F, which receives busbar 42F, is an example of a "first receiving section." Receiving section 55G, which receives busbar 42G, is an example of a "fourth receiving section."Busbar 42F and busbar 42G are the busbars 42 located in the first layer (lower layer) of the three-dimensional installation structure CS.

[0112] In the present embodiment, the busbar 42F comprises a first section 42Fa extending in the X direction and a second section 42Fb, which is bent from the first section 42Fa and extends in the Y direction. The second section 42Fb extends along a boundary B between subunit SUY and subunit SUZ.

[0113] On the other hand, busbar 42H and busbar 42I, for example, are the busbars 42 contained in subunit SUZ. The flat surface section 51 of the base plate 41 of subunit SUZ contains a receiving section 55H and a receiving section 55I as a plurality of receiving sections 55. Busbar 42H is received in receiving section 55H and extends along the flat surface section 51. Busbar 42I is received in receiving section 55I and extends along the flat surface section 51. Busbar 42H and busbar 42I are the busbars 42 located in the first layer (bottom layer) of the three-dimensional installation structure CS.

[0114] The connecting component 100 has the same structure as the connecting component 30 described above for the external connection. For example, the connecting component 100 has a first section 101, a second section 102, and a third section 103. For details of the connecting component 100, in the above description of connecting component 30, "connecting component 30" can be replaced by "connecting component 100", "first section 31" can be replaced by "first section 101", "first mounting hole 31h" can be replaced by "first mounting hole 101h", "second section 32" can be replaced by "second section 102", "second mounting hole 32h" can be replaced by "second mounting hole 102h", and "third section 33" can be replaced by "third section 103". The connecting component 100 is an element that forms an energy supply path in a vertical direction.The connecting component 100 can be described as a “vertical installation element”.

[0115] The majority of connection components 100 contain a connection component 100A and a connection component 100B. Connection component 100A overlaps the second connection section 62 of busbar 42G in subunit SUY, viewed from the Z-direction. Connection component 100A borders the second connection section 62 of busbar 42G in the Z-direction and is connected to it from the Z-direction. Connection component 100A projects from busbar 42G in the +Z-direction. Connection component 100A is an example of a "third connection component".

[0116] The connecting component 100B overlaps the second connecting section 62 of the busbar 42I in the subunit SUZ, viewed from the Z-direction. The connecting component 100B is adjacent to the second connecting section 62 of the busbar 42I in the Z-direction and is connected to it from the Z-direction. The connecting component 100B projects from the busbar 42I in the +Z-direction.

[0117] One end of the coupling busbar 75C is adjacent to the second connection section 62 of busbar 42F in the Z-direction and is connected to the second connection section 62 of busbar 42F from the Z-direction in subunit SUY. The other end of the coupling busbar 75C lies next to the second connection section 62 of busbar 42H in the Z-direction and is connected to the second connection section 62 of busbar 42H from the Z-direction in subunit SUZ. In this configuration, busbar 42F of subunit SUY and busbar 42H of subunit SUZ are electrically connected via the coupling busbar 75C. The coupling busbar 75C is busbar 75, which is located in the first layer (bottom layer) of the three-dimensional installation structure CS.

[0118] On the other hand, the coupling busbar 75D in subunit SUY is adjacent to the first section 101 of the connecting component 100A in the Z direction and is connected to the first section 101 of the connecting component 100A from the Z direction. The other end of the coupling busbar 75D is adjacent to the first section 101 of the connecting component 100B in the Z direction in subunit SUZ and is connected to the first section 101 of the connecting component 100B from the Z direction.

[0119] The coupling busbar 75D is supported at a position remote from busbar 42F in the Z-direction by the first section 101 of connection component 100A and the first section 101 of connection component 100B. The coupling busbar 75D is supported by the first section 101 of connection component 100A and the first section 101 of connection component 100B and extends horizontally (for example, in the X-direction). The coupling busbar 75D is electrically connected to the first section 101 of connection component 100A and the first section 101 of connection component 100B. In this configuration, busbar 42F of subunit SUY and busbar 42I of subunit SUZ are electrically connected via the two connection components 100 and the coupling busbar 75D.

[0120] In the present embodiment, the coupling busbar 75D extends such that it spans the second section 42Fb of the busbar 42F at a position remote from the busbar 42F in the +Z direction. This creates a three-dimensional, intersecting structure formed by the coupling busbar 75D and the busbar 42F. In the present embodiment, the coupling busbar 75D extends such that it spans the boundary B of the majority of the subunits SU.

[0121] In the present embodiment, the three-dimensional routing structure CS of the busbar 42 is provided at a position spanning the boundary B of the plurality of subunits SU. According to this arrangement, the coupling structure between the plurality of subunits SU is reinforced by the three-dimensional routing structure CS. Note that the three-dimensional routing structure CS of the busbar 42 can be provided inside one or more subunits SU instead of being provided at the boundary B of the plurality of subunits SU. <7. Advantages>

[0122] As a comparative example, consider an electrical connection unit where a busbar is arranged in a vertical position relative to the lower wall of an enclosure. Since, for example, a specific cross-sectional area of ​​the busbar is determined to function as a routing element in such a configuration, reducing the width (height) of the vertical busbar can be challenging. In this case, the width of the vertical busbar becomes a bottleneck, and reducing the height of the electrical connection unit can be difficult.

[0123] On the other hand, in the present embodiment, the electrical connection unit 1 comprises the first electronic component 10 and the routing board 40. The routing board 40 comprises a base element 41 and a first busbar 42. The base element 41 has a plate-shaped or sheet-shaped flat surface section 51 with a first surface 51a facing the first electronic component 10. The flat surface section 51 has the first receiving section 55, which is recessed in the Z-direction or penetrates the flat surface section 51 in the Z-direction.The first busbar 42 has a first connection section (for example, a contact section corresponding to a contact area COS) that is electrically connected to the first electronic component 10, wherein at least a portion of the first busbar 42 is received in the first receiving section 55 and extends along the flat surface section 51, and wherein at least the first connection section projects from the first surface in the first direction beyond the first receiving section. According to such a configuration, the width of the busbar is less likely to be a bottleneck compared to the configuration of the comparison example, where at least part of the routing path is formed on a plane, and the height of the electrical connection unit 1 can be easily reduced.

[0124] In the present embodiment, an assembly state is also considered in which the first electronic component 10 and the busbar 42 are electrically connected via the first connection component 20 after the busbar 42 has been received in the receiving section 55. For example, if the first connection component 10 (or a terminal 13 according to a later described modification example) is in contact with both the busbar 42 and the base plate 41, and the first surface 51a of the base plate 41 protrudes in the first direction (Z-direction) with respect to a contact section (first connection section) corresponding to the contact surface COS, the first surface 51a pushes the first connection component 20 upwards in the +Z direction. The contact area of ​​the contact surface COS is less likely to be secure, and the electrical connection of the first electronic component 10 is less likely to be ensured.

[0125] In the present embodiment, the first connecting section 61 projects from the first surface 51a in the first direction (Z-direction) beyond the receiving section 55. According to this design, the first surface 51a barely pushes the first connecting component 20 upwards in the +Z-direction. Since the contact area of ​​the contact surface COS is easily secured, the electrical connection of the first electronic component 10 can be readily ensured.

[0126] In the present embodiment, the thickness of the busbar 42 is greater, at least in the first direction (Z-direction), than the thickness of the flat surface section 51 of the base element (for example, the base plate 41) in the first direction. According to this design, it is possible to increase the cross-sectional area of ​​the busbar 42 compared to a case where the thickness of the busbar 42 and the thickness of the first surface 51a of the base plate 41 have the same value. A higher rated current can be used for the electrical connection unit 1 with the busbar 42. The rated current is obtained by inserting a cross-sectional area into the definition of an upper limit of a current density with respect to a rated current ("current density of a linear conductor" according to JIS C 8480:2016).

[0127] In the present embodiment, a first connecting component 10 is further provided, which is located between the first electronic component 10 and the first connecting section 61 (alternatively the second connecting section 62), wherein the contact surface COS between the first connecting component 10 and the first connecting section is located outside the receiving section 55 and at a position that is a distance from the first surface 51a in the first direction (Z-direction). According to such a design, at least some of the heat generated by the energy input from the busbar 42 itself can be stored (absorbed) in the first connecting component 10. This distributes the amount of heat that is transferred from the busbar 42 via the receiving section 55 to the base element (for example, the base plate 41) within the first connecting component 10.Since the amount of heat transferred decreases, deformation of the base plate 41 due to thermal expansion or thermal contraction can be limited.

[0128] In the present embodiment, the busbar 42 is received in the receiving section 55 over its entire length, extends along the flat surface section 51, and is exposed to the outside of the base plate 41 on the side of the first surface 51a. According to this design, the heat dissipation properties of the electrical connection unit 1 can be further improved, since the wider section acts as a heat dissipation area.

[0129] In the present embodiment, a portion of the lateral circumferential surface 42CS of the busbar 42, which is oriented in the direction intersecting the first direction (Z-direction), is exposed outside the receiving section 55. According to such a design, the heat dissipation properties of the electrical connection unit 1 can be further improved, since a portion of the lateral circumferential surface 42CS acts as a heat dissipation area.

[0130] In the present embodiment, the busbar 42 is integrated with a base element (for example, the base plate 41). According to this design, it is possible to eliminate or reduce the effort required to manually attach the busbar 42 to the housing. Since it is less likely that the busbar 42 will fall off the receiving section 55, the ease of assembly of the electrical connection unit 1 can be further improved. For example, the busbar 42 is integrated with the base element (for example, the base plate 41) by means of an insert molding.

[0131] Furthermore, as a further comparative example, an electrical connection unit is considered in which a synthetic resin adheres to the upper surface of the busbar 42 by means of insert forming. With such a design of the comparative example, the contact area between the busbar 42 and the first connection component 20 is reduced, and it is difficult to secure an electrical connection.

[0132] In the present embodiment, a contact surface between the first connecting component and the first busbar projects from the first surface in the first direction. This design also incorporates a recess in the first direction relative to the contact surface. During the insert forming process, the resin can easily move from the upper surface of the busbar 42, which serves as the contact surface, to the first surface. Therefore, the resin is less likely to adhere to the upper surface of the busbar 42 during the insert forming process.

[0133] In the present embodiment, the busbar 42 is received in the receiving section 55 over its entire length and extends along the flat surface section 51. According to such a design, it is easy to reduce the height of the electrical connection unit 1 while simultaneously improving the ease of assembly of the electrical connection unit 1.

[0134] In the present embodiment, the busbar 42 is received in the receiving section 55 over its entire length, extends along the flat surface section 51, and is exposed to the outside of the base plate 41 on the side of the first surface 51a. According to this design, the heat dissipation properties of the electrical connection unit 1 can be further improved, since the wider section acts as a heat dissipation area.

[0135] In a modification example, which will be described later, the busbar 42 is covered with an insulating foil. According to such a design, it is easy to reduce the voltage drop and inductance of the uncoated busbar.

[0136] Furthermore, as a further comparative example, an electrical connection unit is considered in which a synthetic resin adheres to the upper surface of the busbar 42 by means of insert forming. With such a design of the comparative example, the contact area between the busbar 42 and the first connection component 20 is reduced, and it is difficult to secure an electrical connection.

[0137] In the present embodiment, a contact surface between the first connecting component and the first busbar projects from the first surface in the first direction. This design also incorporates a recess in the first direction relative to the contact surface. During the insert forming process, the resin can easily move from the upper surface of the busbar 42, which serves as the contact surface, to the first surface. Therefore, the resin is less likely to adhere to the upper surface of the busbar 42 during the insert forming process.

[0138] In the present embodiment, a second connecting component 20 is further provided, which has a section oriented with respect to the busbar 42 and electrically connects the second electronic component 20 or an external device to the busbar 42 (e.g., busbar 42B, busbar 42D, busbar 42E, or busbar 42G), wherein the contact surface between the second connecting component 20 and the busbar 42 projects out from the first surface 51a in the first direction (Z-direction). According to such a design, it is less likely that the first surface 51a of the base plate 41 will project out with respect to the contact surface in the Z-direction, and it is less likely that the first surface 51a will push the second connecting component 20 upwards in the +Z-direction.Since the contact area of ​​the contact surface is easily secured, the electrical connection of the second electronic component 20 can be easily ensured.

[0139] In the present embodiment, a second busbar (e.g., busbars of the three subunits SUX, SUY, and SUZ) and the coupling busbar 75, which electrically connects the second busbar to the busbar 42, are further provided, wherein a contact surface between the coupling busbar 75 and the busbars 42 (e.g., busbar 42A, busbar 42C, busbar 42F) projects from the first surface 51a in the first direction (Z-direction). According to such a design, it is less likely that the first surface 51a of the base plate 41 will project in the Z-direction with respect to the contact surface, and it is less likely that the first surface 51a will push the coupling busbar 75 upwards in the +Z-direction. Since the contact area of ​​the contact surface COS is easily secured, the electrical connection of the coupling busbar 75 can be readily ensured. (Second embodiment)

[0140] Next, a second embodiment is described. The second embodiment differs from the first in that an insulating rib 53 is provided between two adjacent busbars 42. Other configurations besides the one described below correspond to the configurations of the first embodiment.

[0141] Fig. Figure 17 is a perspective view illustrating the insulating rib 53. In the present embodiment, the base plate 41 incorporates the insulating rib 53. The insulating rib 53 is a rib projecting in the +Z direction from the first surface 51a of the flat surface section 51. The insulating rib 53 is made of a synthetic resin and has insulating properties. The insulating rib 53 is provided, for example, as part of the base plate 41. The insulating rib 53 is positioned between the two busbars 42 in such a way that their upper surface faces are exposed, and ensures an insulating gap between the two busbars 42.

[0142] In the present embodiment, the routing board 40 includes a busbar 42J and a busbar 42K as the plurality of busbars 42. Furthermore, the base plate 41 includes a receiving section 55J and a receiving section 55K as the plurality of receiving sections 55.

[0143] At least part of the busbar 42J is received in the receiving section 55J and extends along the flat surface section 51. The busbar 42J is electrically connected via the connecting component 20 to the terminal 13A of an electronic component 10 (hereinafter referred to in some cases as the "first electronic component 10"). The busbar 42J projects from the first surface 51a in the first direction (Z-direction), similar to the busbar 42 described in the first embodiment. The busbar 42J is an example of a "first busbar." The receiving section 55J is an example of a "first receiving section."

[0144] At least part of the busbar 42K is received in the receiving section 55K and extends along the flat surface section 51. The busbar 42K is electrically connected via a further connecting component 20 to the terminal 13 of another electronic component 10 (second electronic component). Alternatively, the busbar 42K can be electrically connected via another connecting component 20 to the terminal 13B of the first electronic component 10. The busbar 42K projects from the first surface 51a in the first direction (Z-direction), similar to the busbar 42 described in the first embodiment. The busbar 42K is an example of a "second busbar." The receiving section 55K is an example of a "second receiving section."

[0145] In the present embodiment, the subunit SU comprises the connecting component 30C and the connecting component 30D as the plurality of connecting components 30. The connecting component 30C abuts the busbar 42J in the Z-direction and is connected to the busbar 42J in the Z-direction. The connecting component 30C is electrically connected to a first external device via the external connecting busbar 76. The connecting component 30D abuts the busbar 42K in the Z-direction and is connected to the busbar 42K in the Z-direction. The connecting component 30D is electrically connected to the first external device or a second external device via a further external connecting busbar 76.In the present embodiment, part of the insulating rib 53 is arranged between the connection component 30C (first connection component) and the connection component 30D (second connection component) in order to electrically isolate the connection component 30C (first connection component) from the connection component 30D (second connection component).

[0146] Note that the first connection component is not limited to connection component 30 and can be connection component 20, which is connected to another electronic component 10 (third electronic component) contained in the same subunit SU. Likewise, the second connection component is not limited to connection component 30 and can be connection component 20, which is connected to another electronic component 10 (fourth electronic component) contained in the same subunit SU.

[0147] In the present embodiment, the insulating rib 53 projects from the first surface 51a in the +Z direction at a position between the receiving section 55J and the receiving section 55K. The insulating rib 53 is an example of a "first rib".

[0148] In the present embodiment, the busbar 42J is received in the receiving section 55J in a state in which it is exposed towards the upper surface (first surface 51a) and includes, for example, a first straight section 42Ja extending linearly in the X direction. The busbar 42K is received in the receiving section 55K in a state in which it is exposed towards the upper surface (first surface 51a) and includes, for example, a second straight section 42Ka extending linearly in the X direction. The first straight section 42Ja of the busbar 42J and the second straight section 42Ka of the busbar 42K are, for example, adjacent to each other in the Y direction. The second straight section 42Ka of the busbar 42K runs parallel to the first straight section 42Ja of the busbar 42J.

[0149] The insulating rib 53 is located, viewed from the Z-direction, between the first straight section 42Ja of the busbar 42J and the second straight section 42Ka of the busbar 42K, and extends parallel to the first straight section 42Ja of the busbar 42J and the second straight section 42Ka of the busbar 42K. The first straight section 42Ja of the busbar 42J, the second straight section 42Ka of the busbar 42K, and the insulating rib 53 can extend linearly in the Y-direction instead of in the X-direction.

[0150] Fig. 18 is a cross-sectional view along line F18-F18 of the in Fig. 17 illustrated structures. As in Fig.As illustrated in Figure 18, the insulating rib 53 is located between the lateral circumferential surface 42CS of the busbar 42J and the lateral circumferential surface 42CS of the busbar 42K in the Y-direction. The insulating rib 53 electrically insulates the lateral circumferential surface 42CS of the busbar 42J from the lateral circumferential surface 42CS of the busbar 42K.

[0151] According to this design, even when busbar 42J and busbar 42K are arranged within a predetermined distance, the necessary insulating distance can be ensured by the insulating rib 53. Therefore, the majority of busbars 42 can be arranged close together without difficulty. If the majority of busbars 42 can be easily arranged close together, the electrical connection unit 1 can be miniaturized. In the present embodiment, for example, the insulating rib 53 is located between the lateral circumferential surface 42CS of busbar 42J and the lateral circumferential surface 42CS of busbar 42K in the Y-direction. Thus, the provision of the insulating rib 53 allows busbar 42J and busbar 42K with their exposed lateral circumferential surface CS to be arranged close together without difficulty. <8. Modification Examples>

[0152] The following are some modification examples. Note that in each modification example, the structure differs from the one described below and corresponds to the structure of the first embodiment. (First modification example)

[0153] The routing board 40 is not limited to a structure in which the base plate 41 and the busbar 42 are integrated by insert forming. For example, the busbar 42 can be positioned in the receiving section 55 after the base plate 41, which provides the receiving section 55 for receiving the busbar 42, has been formed. In this case, the busbar 42 can be fitted to the receiving section 55 or fixed to the receiving section 55 by an adhesive or other fastener. In these cases, potting can be performed to fill any gap between the busbar 42 and the receiving section 55. (Second modification example)

[0154] A basic element of the busbar 40 is not limited to the base plate 41 with the plate-shaped, flat surface section 51. The busbar 40 can be a basic element (for example, an insulating film) with a sheet-like, flat surface section 51. In this case, the receiving section 55 can be formed by a portion of the flat surface section 51 that follows the outer shape of the busbar 42. In the present disclosure, the term "sheet-like" or "sheet" is not limited to an element with a thickness of 1 mm or more, and an element (a so-called film) with a thickness of less than 1 mm can also be used. (Third modification example)

[0155] The connection between the electronic component 10 and the busbar 42 is not limited to the connection via the connecting component 20. The electronic component 10 can be directly connected to the busbar 42 by a fastening element (for example, a bolt or a screw), by welding, or similar means. For example, it is conceivable that the terminal 13 of the electronic component 10 and the busbar 42 could be brought into direct contact with each other by welding or similar means. (Fourth modification example)

[0156] The base plate 41 of the routing board 40 can contain a plurality of elements (plate elements or sheet metal elements). These elements are provided to accommodate the plurality of busbars 42, which are arranged, for example, horizontally, from both sides in the Z-direction. For example, the plurality of elements are integrated by joining the plurality of busbars 42 together, for example, by laminate forming. The plurality of elements forms the flat surface section 51. In this case, the receiving section 55 can be formed in a hollow shape within the base plate 41 (between the plurality of elements). The plurality of elements can be a plurality of plate elements, a plurality of sheet metal elements, or a combination of a plate element and a sheet metal element. The plate element can, for example, be a flexible plate element.The flat surface section 51 formed by the majority of elements has an opening through which at least the first connecting section 61 and the second connecting section 62 of the busbar 42 are exposed. For example, in this case, the receiving section 55 formed between the majority of elements corresponds to an example of a "recessed receiving section in the first direction (Z-direction)."

[0157] Several embodiments and examples of modification have been described above. However, the embodiment and the examples of modification are not limited to the examples described above. For example, a plurality of embodiments can be implemented in combination with one another. The embodiments described above can be implemented in various other forms, and various additions, omissions, substitutions, and modifications can be made without departing from the concept of the present disclosure.

[0158] According to the present disclosure, the height of the electrical connection unit can be reduced. REFERENCE MARK LIST 1 electrical connection unit SU subunit 10 electronic components 13, 13A, 13B connection 20 connection components 21 first section 21h first mounting hole 22 second section 22h second mounting hole 30 connection components 31 first section 32 second section 40 installation board 41 Base plate 42 busbar 42e1 End of busbar 42p plate section 42u exposed section 42ua first section 42ub second section 43 Fastening element (fastening section) 51 flat surface section (insulating base section) 51a first surface, third surface 51b second surface, fourth surface 52 Fixing section 52a first section, third section 52b second section, fourth section 55 Recording section 56 Coupling section 56a In-depth study 61 first connecting section 62 second connecting section 63 extending section 64 Extension 71 Fastening element 72 Fastening element 73 Fastening element 80 metal plate 81 flat surface section (metal base section) 82 Fixing section 83 Fixing section 92 Heat transfer element 92a first heat transfer section 92b second heat transfer section 100 connection components 101 first section 102 second section 111 Fastening element 112 Fastening element QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited non-patent literature

[0000] JIS C 8480:2016

[0126]

Claims

[1] Electrical connection unit comprising: a first electronic component; an insulating base element with a plate-shaped or sheet-shaped flat surface section having a first surface facing the first electronic component; and a first busbar with a first connecting section that is electrically connected to the first electronic component, wherein the insulating base element is provided with a first receiving section which is recessed in a first direction or penetrates the flat surface section in the first direction if a thickness direction of the flat surface section is the first direction, and at least part of the first busbar is captured in the first recording section and extends along the flat surface section, and at least part of the first connecting section extends from the first surface in the first direction beyond the first recording section. [2] Electrical connection unit according to claim 1, wherein at least one thickness of the first connection section in the first direction is greater than one thickness of the flat surface section in the first direction. [3] Electrical connection unit according to claim 1 or 2, further comprising a first connection component provided between the first electronic component and the first connection section, wherein a contact surface between the first connection component and the first connection section is located outside the first receiving section and at a position away from the first surface in the first direction. [4] Electrical connection unit according to claim 1 or 2, wherein the first busbar is received in the first receiving section over the entire length of the first busbar and extends along the flat surface section and projects from the first surface in the first direction over the entire length of the first busbar beyond the first receiving section. [5] Electrical connection unit according to claim 1 or 2, wherein a part of a lateral circumferential surface of the first busbar, which is directed in a direction intersecting the first direction, is exposed outside the first receiving section. [6] Electrical connection unit according to claim 1 or 2, wherein the first busbar is integrated with the base element.

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