Routing substrate and electrical connection unit

Abstract

One embodiment provides a routing substrate and an electrical connection unit capable of reducing the height of the electrical connection unit.SOLUTION: A routing substrate according to an embodiment includes a base member having an insulating base portion, a first bus bar held by the insulating base portion and including a routing portion routed from a first portion to a second portion of the insulating base portion, and a second bus bar held by the first portion. A part of the first bus bar passes through a region overlapping the second bus bar, at least a part of the first bus bar extends in a plate shape along the insulating base, and at least a part of the second bus bar extends in a plate shape along the insulating base.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a wiring board and an electrical connection unit. [Background technology]

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

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

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

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

[0006] In one embodiment, the wiring board comprises a base member having an insulating base, a first bus bar held by the insulating base and including a wiring portion that is routed from a first portion to a second portion of the insulating base, and a second bus bar held by the first portion, wherein, when viewed in the thickness direction of the insulating base, a portion of the first bus bar passes through an area that overlaps with the second bus bar, at least a portion of the first bus bar extends in a plate-like shape along the insulating base, and at least a portion of the second bus bar extends in a plate-like shape along the insulating base. [Effects of the Invention]

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

[0008] [Figure 1] FIG. 2 is a perspective view showing an arrangement board according to an embodiment. [Figure 2] FIG. 2 is a perspective view illustrating an electronic component and a connecting component according to an embodiment. [Figure 3] FIG. 2 is a perspective view illustrating an electronic component and a connecting component according to an embodiment. [Figure 4] FIG. 1 is a perspective view showing a connecting part according to an embodiment. [Figure 5] 2 is a cross-sectional view of the structure shown in FIG. 1 taken along line AA. [Figure 6] FIG. 2 is a cross-sectional view of the structure shown in FIG. 1 taken along line BB. [Figure 7] 2 is a cross-sectional view of the structure shown in FIG. 1 taken along line CC. [Figure 8] FIG. 2 is a cross-sectional view of the structure shown in FIG. 1 taken along line DD. [Figure 9] FIG. 2 is a plan view showing the wiring board according to the embodiment; [Figure 10] FIG. 10 is a cross-sectional view showing a modified example of the embodiment. [Figure 11] FIG. 10 is a perspective view showing a modification of the embodiment. [Figure 12] FIG. 10 is a partially exploded perspective view of a first bus bar according to a modified example of the embodiment. DETAILED DESCRIPTION OF THE INVENTION

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

[0010] In this disclosure, terms are defined as follows: "Connection" is not limited to mechanical connection and may include electrical connection. In other words, "connection" is not limited to direct connection between two elements to be connected, but may include connection between two elements via another element interposed therebetween. "Facing" means that virtual projection images of two objects overlap when viewed from a specific direction. In other words, "facing" is not limited to two objects directly facing each other, but may include two objects facing each other with another component interposed between them. "Parallel," "orthogonal," or "same" may include "substantially parallel," "substantially perpendicular," or "substantially the same," respectively.

[0011] In the present disclosure, the +X direction, the −X direction, the +Y direction, the −Y direction, the +Z direction, and the −Z direction are defined as follows: The +X direction is the direction from the first end 40e1 to the second end 40e2 of the wiring board (described later) (see FIG. 1). The −X direction is the direction opposite to the +X direction. Hereinafter, when the +X direction and the −X direction are not distinguished, they will simply be referred to as the “X direction.” The +Y direction and the −Y direction are directions that intersect (e.g., are perpendicular to) the X direction. The +Y direction is the direction from the third end 40e3 to the fourth end 40e4 of the wiring board (described later) (see FIG. 1). The −Y direction is the direction opposite to the +Y direction. Hereinafter, when the +Y direction and the −Y direction are not distinguished, they will simply be referred to as the “Y direction.” The +Z direction and the −Z direction are directions that intersect (e.g., are perpendicular to) the X direction and the Y direction. The +Z direction is the thickness direction of the insulating base of the base member provided on the wiring board (see Figure 1). The -Z direction is the direction opposite to the +Z direction. Hereinafter, when there is no need to distinguish between the +Z direction and the -Z direction, they will simply be referred to as the "Z direction." The Z direction is an example of the "first direction." The X direction is an example of the "second direction." The Y direction is an example of the "third direction." Note that the "second direction" is not limited to the X direction, but may be the Y direction or another direction. The "third direction" is not limited to the Y direction, and is a direction that intersects the "first direction" and the "second direction."

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

[0013] (First embodiment) <1. Configuration of the electrical connection unit> 1 is a cross-sectional view showing an electrical connection unit 1 of a first embodiment. The electrical connection unit 1 is an in-vehicle device mounted on a vehicle such as an EV (Electric Vehicle), HEV (Hybrid Electric Vehicle), or PHEV (Plug-in Hybrid Electric Vehicle).

[0014] The electrical connection unit 1 has, for example, a main body MU. The electrical connection unit 1 may also include an outer casing member that covers the subunits SU included in the main body MU. The outer casing member is a member that ensures the rigidity of the electrical connection unit 1 and enhances the heat dissipation properties of the electrical connection unit 1. The outer casing member is made of metal (for example, aluminum or an aluminum alloy).

[0015] <2. Main body> First, the main body MU will be described. FIG. 1 is a perspective view illustrating the main body unit MU. The main body unit MU is a part that performs the main function of the electrical connection unit 1 (for example, switching the electrical connection state or overcurrent protection). In this embodiment, the main body unit MU has one subunit SU. The main body unit MU may also have multiple subunits SU. In this case, each subunit SU has the same or a similar basic structure. When multiple subunits SU are connected, the main body unit MU can perform the functions of each subunit SU. The subunit SU may also be referred to as a "circuit assembly."

[0016] The subunit SU has an electrical function. The subunit SU includes, for example, at least one electronic component 10, at least one connection component 20, at least one connection component 30, and a wiring board 40. The electronic component 10 is electrically connected to the wiring board 40. The connection components 20 and 30 are components that form a vertical current path. The connection components 20 and 30 may also be referred to as "vertical wiring components."

[0017] <3. Electronic components and connecting parts> First, the electronic component 10 and the connecting component 20 for connecting the components will be described. The electronic component 10 is an electronic component that is installed in the subunit SU according to the functions required. The electronic component 10 is, for example, a connector, a fuse, a relay (e.g., a mechanical relay or a semiconductor relay), a capacitor, a branching component, various sensors (e.g., a current sensor or a voltage sensor), an electronic control unit, or an electronic component unit that combines two or more of these. Note that the type of electronic component 10 is not limited to the above example. The electronic component 10 is, for example, a heat-generating component that generates heat when power is applied. Below, a first type electronic component 10M and a second type electronic component 10N will be described as examples of the electronic component 10.

[0018] The connection component 20 is a component that electrically connects the electronic component 10 and the wiring board 40. The connection component 20 forms part of the current path in the subunit SU. The connection component 20 is made of metal (for example, copper or a copper alloy). The connection component 20 may also be referred to as a "metal component." Below, a first type connection component 20M and a second type connection component 20N will be described as examples of the connection component 20.

[0019] <3.1 Type 1 Electronic Components> 2 is a perspective view showing a first type electronic component 10M and a first type connecting component 20M. The first type electronic component 10M is an electronic component having a plurality of terminals 13 arranged side by side at one end of the electronic component 10M. The electronic component 10M has, for example, a case 11, a component main body 12, a plurality of terminals 13, and a plurality of mounting portions 14.

[0020] (case) Case 11 is an outer shell member that forms most of the outer shape of electronic component 10M. Case 11 is made of, for example, synthetic resin and has insulating properties. Case 11 houses component main body 12. Note that case 11 and component main body 12 may be formed integrally.

[0021] In this embodiment, the case 11 has an insulating rib 11a that protrudes in a horizontal direction (e.g., the X direction) and extends in the Z direction. The insulating rib 11a is, for example, a plate-like shape that is aligned in the horizontal direction (e.g., the X direction) and the Z direction. The insulating rib 11a extends, for example, over the entire length of the case 11 in the Z direction. The insulating rib 11a is disposed between a plurality of terminals 13 (terminals 13A and 13B described below). The insulating rib 11a electrically insulates the terminals 13A from the terminals 13B. In this embodiment, a portion of the insulating rib 11a is disposed between first portions 21 (described below) of two connection parts 20M connected to the electronic component 10M. The insulating rib 11a electrically insulates the first portions 21 of the two connection parts 20M connected to the electronic component 10M.

[0022] (Component body) The component body 12 is a part that performs the main function of the electronic component 10M. For example, if the electronic component 10M is a relay, the component body 12 includes a switching part (e.g., a contact part) that switches between a conductive state and a non-conductive state. For example, if the electronic component 10M is a fuse, the component body 12 includes a fusing part that melts when an overcurrent flows. For example, if the electronic component 10M is a capacitor, the component body 12 includes a part that stores electric charge.

[0023] (Terminal) Terminal 13 is an electrical connection portion exposed to the outside of case 11. Terminal 13 is electrically connected to component main body 12 inside case 11. In this embodiment, electronic component 10M includes terminal 13A and terminal 13B as the multiple terminals 13. One of terminal 13A and terminal 13B is a positive terminal. The other of terminal 13A and terminal 13B is a negative terminal. One of terminal 13A and terminal 13B is an example of a "first terminal." The other of terminal 13A and terminal 13B is an example of a "second terminal."

[0024] In this embodiment, terminals 13A and 13B are provided at one end of electronic component 10M in the horizontal direction (e.g., the X direction). Terminals 13A and 13B are arranged side by side in the horizontal direction (e.g., the Y direction). Each terminal 13 has a mounting hole 13h to which a fastening member 71 (e.g., a screw or a bolt) described later is attached. Mounting hole 13h opens in the horizontal direction (e.g., the X direction). The inner circumferential surface of mounting hole 13h of electronic component 10M has a threaded groove.

[0025] (Mounting part) The mounting portion 14 is a portion for fixing the electronic component 10M when a protrusion or through-hole corresponding to the mounting hole 14h is present on the wiring board 40. For example, the mounting portion 14 has a mounting hole 14h to which a fastening member (e.g., a screw or a bolt) is attached. The mounting hole 14h is open in the Z direction. The mounting hole 14h is an insertion hole through which the fastening member or the protrusion is passed.

[0026] <3.2 Type 1 connection parts> The first-type connecting part 20M is a part that electrically connects the first-type electronic component 10M and the wiring board 40. In this embodiment, the connecting part 20M electrically connects the electronic component 10M and a bus bar 42 included in the wiring board 40. In this embodiment, the width L12 of the connecting part 20M in the longitudinal direction (e.g., the X direction) of the electronic component 10M is smaller than the width L11 of the electronic component 10M in the longitudinal direction. The connecting part 20M has, for example, a first portion 21 and a second portion 22.

[0027] (Part 1) The first portion 21 of the connecting part 20M is a portion that is connected to the terminal 13 of the electronic component 10M. The first portion 21 is a plate-like or rectangular parallelepiped portion that extends in the Z direction. The first portion 21 extends in the Z direction along one end (e.g., an end in the X direction) of the electronic component 10M. The first portion 21 is an upright portion that stands in the Z direction relative to the wiring board 40 (e.g., relative to a bus bar 42 described below). The first portion 21 is adjacent to the electronic component 10M in the horizontal direction (e.g., the X direction). For example, the first portion 21 is adjacent to the terminal 13 of the electronic component 10M in the horizontal direction (e.g., the X direction) and is connected to the terminal 13 of the electronic component 10M from the horizontal direction (e.g., the X direction).

[0028] The first portion 21 of the connecting part 20M has a first mounting hole 21h through which a fastening member 71 (e.g., a screw or a bolt) is passed. The first mounting hole 21h is open in the horizontal direction (e.g., the X direction). The first portion 21 also has a recess 25 around the first mounting hole 21h. The recess 25 is a receiving portion that receives the head of the fastening member 71 inserted into the first mounting hole 21h. The fastening member 71 passed through the first mounting hole 21h engages with the mounting hole 13h of the terminal 13 of the electronic component 10M, thereby physically and electrically connecting the first portion 21 to the terminal 13 of the electronic component 10M. Note that the first portion 21 does not necessarily have to have the recess 25.

[0029] (Second part) The second portion 22 of the connection part 20M is a portion that is connected to the bus bar 42. The second portion 22 protrudes in a horizontal direction (e.g., in the X direction) from the end of the first portion 21 on the -Z direction side. The second portion 22 is a plate portion that extends horizontally. The second portion 22 is adjacent to the bus bar 42 in the Z direction and is connected to the bus bar 42 from the Z direction. The second portion 22 of the connection part 20M is attached from the Z direction to a fastening member 43 (e.g., a screw or a bolt) that protrudes from the bus bar 42 in the +Z direction, and is physically and electrically connected to the bus bar 42. In this embodiment, the second portion 22 of the connection part 20M has a second mounting hole 22h through which the fastening member 43 is passed. The second mounting hole 22h is open in the Z direction. The fastening member 43 is passed through the second mounting hole 22h of the second portion 22. Then, a fastening element such as a nut engages with the tip of a fastening member 43 passed through the second mounting hole 22h, thereby fixing the second portion 22 to the bus bar 42. In this embodiment, the first portion 21 and the second portion 22 form an L-shaped, single-piece connecting part 20M.

[0030] <3.3 Second type of electronic components> FIG. 3 is a perspective view showing a second-type electronic component 10N and a second-type connecting component 20N. The second-type electronic component 10N is an electronic component in which two terminals 13 are arranged separately at both horizontal ends of the electronic component 10N. The electronic component 10N includes, for example, a case 11, a component main body 12, and a plurality of terminals 13. Note that, among the components of the electronic component 10N, components having the same function as the electronic component 10M are denoted by the same reference numerals. In this case, in the description of the electronic component 10N, "electronic component 10M" can be read as "electronic component 10N" in the description of the electronic component 10M described above.

[0031] In electronic component 10N, terminals 13A and 13B are arranged separately at both ends of electronic component 10N in the horizontal direction (e.g., the X direction). Each terminal 13 has a mounting hole 13h to which a fastening member 72 (e.g., a screw or a bolt) described below is attached. Mounting hole 13h opens in the Z direction. For example, mounting hole 13h of electronic component 10N is an insertion hole through which fastening member 72 is passed. One of terminal 13A and terminal 13B is an example of a "first terminal." The other of terminal 13A and terminal 13B is an example of a "second terminal."

[0032] <3.4 Second type of connecting parts> The second-type connection part 20N is a part that electrically connects the second-type electronic component 10N to the wiring board 40. For example, the connection part 20N electrically connects the electronic component 10N to a bus bar 42 included in the wiring board 40. In this embodiment, the width L12 of the connection part 20N in the longitudinal direction (e.g., the X direction) of the electronic component 10N is smaller than the width L11 of the electronic component 10N in the longitudinal direction. The connection part 20N has, for example, a first portion 21, a second portion 22, and a third portion 23.

[0033] (Part 1) The first portion 21 of the connection part 20N is a portion connected to the terminal 13 of the electronic component 10N. The first portion 21 is a rectangular parallelepiped portion extending in the Z direction. The first portion 21 is an upright portion that stands in the Z direction relative to the routing board 40 (e.g., relative to the bus bar 42). The first portion 21 is adjacent to the terminal 13 of the electronic component 10N in the Z direction and is connected to the terminal 13 of the electronic component 10N from the Z direction. The first portion 21 of the connection part 20N has a first mounting hole 21h with which a fastening member 72 engages. The first mounting hole 21h opens in the Z direction. The inner circumferential surface of the first mounting hole 21h of the connection part 20N has a thread groove. The first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10N by engaging the fastening member 72 passed through the mounting hole 13h of the terminal 13 of the electronic component 10N with the first mounting hole 21h of the first part 21.

[0034] (Second part) The second portion 22 of the connection part 20N is a portion connected to the bus bar 42. The second portion 22 protrudes horizontally (e.g., in the X direction) from the end of the first portion 21 on the -Z direction side. The second portion 22 is a plate portion extending horizontally. The second portion 22 is adjacent to the bus bar 42 in the Z direction and connected to the bus bar 42 from the Z direction. The second portion 22 of the connection part 20N is attached from the Z direction to a fastening member 43 (e.g., a screw or a bolt) protruding from the bus bar 42 in the +Z direction, and is physically and electrically connected to the bus bar 42. In this embodiment, the second portion 22 of the connection part 20N has a second mounting hole 22h through which the fastening member 43 is passed. The second mounting hole 22h is open in the Z direction. The fastening member 43, which will be described later, is passed through the second mounting hole 22h of the second portion 22. Then, a fastening element such as a nut is engaged with the tip of the fastening member 43 passed through the second mounting hole 22h, whereby the second portion 22 is fixed to the bus bar .

[0035] (3rd part) The third portion 23 is an upright wall (side wall) that stands in the +Z direction from both horizontal end portions of the second portion 22. The third portion 23 is a wall that extends along the Z direction. The third portion 23 is connected to the first portion 21 and also to the second portion 22. The third portion 23 extends at an incline that increases in the X direction as it progresses in the -Z direction, for example. The third portion 23 may be provided in the connection part 20M described above. On the other hand, the connection part 20N may not have the third portion 23.

[0036] <3.5 External connection parts> Next, the connecting part 30 for external connection will be described. FIG. 4 is a perspective view showing a connection part 30 for external connection. The connection part 30 is a part that electrically connects an external connection bus bar 76 and a wiring board 40. For example, the connection part 30 electrically connects the external connection bus bar 76 and a bus bar 42 included in the wiring board 40. The external connection bus bar 76 is electrically connected to an external device. In this disclosure, the term "external device" refers to an electrical device that exists outside the electrical connection unit 1. Examples of the external device include, but are not limited to, a battery unit mounted on a vehicle or an inverter for driving a vehicle motor. The connection part 30 has, for example, a first portion 31, a second portion 32, and a third portion 33.

[0037] (Part 1) The first portion 31 is a portion connected to the external connection busbar 76. The first portion 31 is a rectangular parallelepiped portion extending in the Z direction. The first portion 31 is an upright portion that stands in the Z direction relative to the wiring board 40 (e.g., relative to the busbar 42). The first portion 31 is adjacent to the external connection busbar 76 in the Z direction and is connected to the external connection busbar 76 from the Z direction. The first portion 31 has a first mounting hole 31h through which a fastening member 73 (e.g., a screw or a bolt) is passed. The first mounting hole 31h opens in the Z direction. The inner circumferential surface of the first mounting hole 31h has a thread groove. The first portion 31 is physically and electrically connected to the external connection busbar 76 by the fastening member 73 passed through the mounting hole 76h of the external connection busbar 76 engaging with the first mounting hole 31h of the first portion 31.

[0038] (Second part) The second portion 32 is a portion connected to the bus bar 42. The second portion 32 protrudes in a horizontal direction (e.g., in the X direction) from the end of the first portion 31 on the −Z direction side. The second portion 32 is a plate portion extending horizontally. The second portion 32 is adjacent to the bus bar 42 in the Z direction and connected to the bus bar 42 from the Z direction. The second portion 32 is attached from the Z direction to a fastening member 43 (e.g., a screw or a bolt) protruding from the bus bar 42 in the +Z direction, and is physically and electrically connected to the bus bar 42. In this embodiment, the second portion 32 has a second mounting hole 32h through which the fastening member 43 is passed. The second mounting hole 32h opens in the Z direction. The fastening member 43, which will be described later, is passed through the second mounting hole 32h of the second portion 32. A fastening element such as a nut engages with the tip of the fastening member 43 passed through the second mounting hole 32h, thereby fixing the second portion 32 to the bus bar 42.

[0039] (3rd part) The third portion 33 is an upright wall (side wall) that stands in the +Z direction from both horizontal ends of the second portion 32. The third portion 33 is a wall that extends along the Z direction. The third portion 33 is connected to the first portion 31 and also to the second portion 32. For example, in FIG. 4, the third portion 33 extends at an incline that increases in the X direction (or Y direction) as it progresses in the -Z direction. Note that the connecting part 30 does not necessarily have the third portion 33.

[0040] <3.6 Wiring board> Next, the wiring board 40 will be described. The wiring board 40 is a member that forms at least a portion of the electrical paths between multiple electronic components 10 and / or at least a portion of the electrical paths between the electronic components 10 and an external device. In this disclosure, the term "wiring board" refers to a board-type wiring structure. "Board-type" refers to a plate-like structure that is flat when viewed overall, regardless of its detailed shape. In this disclosure, "plate-like" or "flat" does not necessarily mean completely flat, but may also include cases where a fixing structure or rib protruding in the Z direction is present in some parts, or where the surface has an uneven shape that conforms to the thickness of the bus bar. In this embodiment, the wiring board 40 is flat and extends along the X and Y directions.

[0041] When viewed from the Z direction, the routing board 40 has a rectangular shape aligned with the X direction. The routing board 40 has a first end 40e1, a second end 40e2, a third end 40e3, and a fourth end 40e4. The first end 40e1 and the second end 40e2 are a pair of ends in the longitudinal direction of the routing board 40 and are spaced apart in the X direction. The third end 40e3 and the fourth end 40e4 are a pair of ends in the lateral direction of the routing board 40 and are spaced apart in the Y direction.

[0042] The wiring board 40 includes, for example, a base portion 41, a plurality of bus bars 42, and a plurality of fastening members 43. The plurality of bus bars 42 includes at least one first bus bar 42a and at least one second bus bar 42b. The composition ratio of the first bus bar 42a to the second bus bar 42b in the plurality of bus bars 42 varies appropriately depending on the three-dimensional wiring structure. For example, in this embodiment, the wiring board 40 includes two bus bars 42. The two bus bars 42 include the first bus bar 42a and the second bus bar 42b.

[0043] The first bus bar 42a is a first type bus bar 42 and is used for three-dimensional wiring. The second bus bar 42b is a second type bus bar 42 and is used for two-dimensional wiring. The first bus bar 42a and the base portion 41 are integrated by insert molding. For example, the wiring board 40 is formed as a single member by insert molding the first bus bar 42a with the base portion 41 after fastening members 43 are fixed to the first bus bar 42a. In other words, the first bus bar 42a is integrated with the base portion 41 without using fastening members such as screws or bolts.

[0044] The second bus bar 42b may be placed on the base portion 41 after a separate groove has been formed in the base portion 41. Alternatively, the second bus bar 42b and the base portion 41 may be integrated by insert molding. When the second bus bar 42b is integrated with the base portion 41, handling during assembly becomes easier.

[0045] The base portion 41, the bus bars 42 (first bus bar 42a, second bus bar 42b), and the fastening members 43 will be described below.

[0046] (base part) The base portion 41 is a holding member that integrally holds the plurality of bus bars 42 that are spaced apart and intersect three-dimensionally. The base portion 41 is made of, for example, a synthetic resin and has insulating properties. The base portion 41 electrically insulates the plurality of bus bars 42 from one another. The base portion 41 is an example of a "base member." The base portion 41 may also be referred to as an "insulating substrate." The base portion 41 has, for example, a flat portion 51.

[0047] The flat portion 51 is a plate-shaped portion of the base portion 41. The flat portion 51 is a plate-shaped portion extending in the horizontal direction. The flat portion 51 forms the main portion of the base portion 41. The flat portion 51 forms the base portion (insulating base portion) of the base portion 41. In this embodiment, the flat portion 51 extends across the entire width of the base portion 41 in the X direction and across the entire width of the base portion 41 in the Y direction.

[0048] As shown in FIGS. 5 to 8, the flat portion 51 has a first surface 51a and a second surface 51b. The first surface 51a is a surface facing the +Z direction. The first surface 51a is a plane extending along the horizontal direction. The first surface 51a faces at least one electronic component 10. The second surface 51b is located on the opposite side to the first surface 51a. The second surface 51b is a surface facing the -Z direction. The second surface 51b is a plane extending along the horizontal direction. The thickness direction (plate thickness direction) of the flat portion 51 is the Z direction.

[0049] For example, the planar portion 51 holds one of the plurality of bus bars 42 at a distance from the other bus bars 42 .

[0050] The planar portion 51 holds a portion of the wiring portion (described later) inside the base portion 41. At this time, a three-dimensional wiring structure (hereinafter also referred to as a "three-dimensional wiring structure") is maintained by the plurality of bus bars 42. Of the plurality of bus bars 42 included in the three-dimensional wiring structure, a specific bus bar 42 three-dimensionally intersects with the other bus bars 42. For example, in this embodiment, the specific bus bar 42 is the first bus bar 42a.

[0051] For example, the flat portion 51 may have a protrusion or a through-hole corresponding to the mounting hole 14h. The protrusion or the through-hole allows the electronic component 10M to be integrated with the wiring board 40. When the flat portion 51 has the protrusion, the electronic component 10M can be fixed by thermal caulking. Fixing the electronic component 10M by thermal caulking can reduce the number of parts required to fix the electronic component 10M. When the flat portion 51 has the through-hole, the electronic component 10M can be fixed by mechanical joining using fastening elements such as screws or bolts.

[0052] (busbar) The busbar 42 is a wiring member (electrical connection member) included in the wiring board 40. The busbar 42 has, for example, a first connection portion 61, a second connection portion 62, and a wiring portion 63. The busbar 42 is, for example, a wiring member for electrically connecting a plurality of electronic components 10. Alternatively, the busbar 42 may be a wiring member for connecting the electronic components 10 to an external device. The busbar 42 is made of metal (for example, copper or a copper alloy) and is conductive. The thickness of the busbar 42 is 1 mm or more (for example, 3 mm or more) to 20 mm. As described above, in this embodiment, the wiring board 40 has, for example, a first busbar 42a and a second busbar 42b as the plurality of busbars 42. The first busbar 42a and the second busbar 42b are arranged to intersect with each other at a distance. The first bus bar 42a and the second bus bar 42b include portions that are arranged on the same plane (see FIG. 10). For example, the first bus bar 42a and the second bus bar 42b are configured so that their first connection portions 61 are arranged on the same plane. In the present embodiment, for example, the first bus bar 42a and the second bus bar 42b are configured so that their second connection portions 62 are arranged on the same plane. However, the second connection portions 62 do not have to be on the same plane. Modified examples of the arrangement of the second connection portions 62 will be described later.

[0053] At least a portion of each bus bar 42 has a plate shape extending in the horizontal direction. At least a portion of each bus bar 42 extends along the flat portion 51. That is, at least a portion of each bus bar 42 extends in a plate shape along the first surface 51a of the flat portion 51. At least a portion of each bus bar 42 extends in the horizontal direction. In this embodiment, the extension portion 631 of the first bus bar 42a extends in a plate shape along the flat portion 51. In this case, the extension portion 631 of the first routing portion 63a is held by the lower portion LL of the base portion 41. The lower portion LL is an example of the second portion.

[0054] As shown in FIG. 9, when viewed in the thickness direction (Z direction), a portion of the extending portion 631 of the first routing portion 63a passes through an area overlapping with the second bus bar 42b. For example, in this embodiment, when viewed in the thickness direction (Z direction), a portion of the extending portion 631 of the first routing portion 63a passes through an area AR overlapping with the extending portion 631 of the second routing portion 63b. As shown in FIG. 8, the extending portion 631 of the first routing portion 63a is exposed from the base member (base portion 41) at a lower portion LL. The first bus bar 42a in this embodiment is a member that forms electrical paths in the horizontal and vertical directions. A bent portion 632, which will be described later, is used to form an electrical path in the vertical direction.

[0055] The second busbar 42b has a plate shape extending horizontally across the entire second busbar 42b. In the second busbar 42b, at least a portion of a second routing portion 63b (described later) is held by an upper portion SL of the base portion 41 and extends along the flat portion 51. The upper portion SL is an example of a first portion. In this embodiment, an extension portion 631 of the second busbar 42b extends in a plate shape along the flat portion 51. In this case, the extension portion 631 of the second routing portion 63b is held by the upper portion SL of the base portion 41. In this embodiment, the second busbar 42b is a member that forms a horizontal current path.

[0056] The first connection portion 61 is a portion that comes into contact with one connection component 20 (hereinafter referred to as the "first connection component 20"). The first connection component 20 is a connection component that connects one electronic component 10 (hereinafter referred to as the "first electronic component 10") and the bus bar 42. The first connection portion 61 is held by the upper portion SL of the base portion 41 and extends along the insulating base. The first connection portion 61 is a portion of the bus bar 42 that overlaps with the first connection component 20 when viewed from the Z direction. The first connection portion 61 is adjacent to the first connection component 20 in the Z direction and is connected to the first connection component 20 from the Z direction.

[0057] The second connection portion 62 is a portion that comes into contact with another connection component 20 (hereinafter referred to as the "second connection component 20"). The second connection component 20 is a connection component that connects another electronic component 10 (hereinafter referred to as the "second electronic component 10") included in the plurality of electronic components 10 to the bus bar 42. For example, the second connection portion 62 in this embodiment is held by the upper portion SL of the base portion 41 and extends along the insulating base. The second connection portion 62 is a portion of the bus bar 42 that overlaps with the second connection component 20 when viewed from the Z direction. The second connection portion 62 is adjacent to the second connection component 20 in the Z direction and is connected to the second connection component 20 from the Z direction.

[0058] Alternatively, the first connection portion 61 and / or the second connection portion 62 may be a portion that contacts another connection component 30 (hereinafter referred to as "second connection component 30") instead of the above example. The connection component 30 is a connection component for connecting an external device to the bus bar 42. In this case, the first connection portion 61 (second connection portion 62) is a portion of the bus bar 42 that overlaps with the second connection component 30 when viewed from the Z direction. The first connection portion 61 (second connection portion 62) is adjacent to the second connection component 30 in the Z direction and is connected to the second connection component 30 from the Z direction.

[0059] Furthermore, the first connection portion 61 may be a portion that contacts a connecting busbar for connecting to another subunit SU, instead of the connection parts 20, 30. In this case, the first connection portion 61 is a portion of the busbar 42 that overlaps with the connecting busbar when viewed from the Z direction. The first connection portion 61 is adjacent to the connecting busbar in the Z direction and is connected to the connecting busbar from the Z direction. The connecting busbar is an example of a third busbar.

[0060] Furthermore, second connection portion 62 may be a portion that contacts a connecting bus bar for connecting to another subunit SU, instead of connection parts 20, 30. In this case, second connection portion 62 is a portion of bus bar 42 that overlaps with the connecting bus bar when viewed from the Z direction. Second connection portion 62 is adjacent to the connecting bus bar in the Z direction and is connected to the connecting bus bar from the Z direction.

[0061] The wiring portion 63 is provided between the first connection portion 61 and the second connection portion 62. The wiring portion 63 extends across the first connection portion 61 and the second connection portion 62. The wiring portion 63 connects the first connection portion 61 and the second connection portion 62.

[0062] The first busbar 42a includes a first routing portion 63a as a first type routing portion 63. The first routing portion 63a of the first busbar 42a is routed from a first connection portion 61 at an upper portion SL of the insulating base to a lower portion LL. The first routing portion 63a includes an extending portion 631 and at least one bent portion 632. The extending portion 631 extends in the X direction or the Y direction and forms a horizontal current path. The bent portion 632 is a member that forms a current path that intersects with the extension direction of the extending portion 631. The bent portion 632 forms a current path in the Z direction. For example, in this embodiment, the first busbar 42a includes a first bent portion 632a and a second bent portion 632b as the bent portion 632. The first bent portion 632a bends from the first connection portion 61 toward the extending portion 631, electrically connecting the first connection portion 61 and the extending portion 631. The second bent portion 632b bends from the extending portion 631 toward the second connection portion 62, electrically connecting the extending portion 631 and the second connection portion 62. In the first bus bar 42a, the first routing portion 63a extends across the first connection portion 61 and the second connection portion 62. In the first bus bar 42a, the first connection portion 61, the first routing portion 63a, and the second connection portion 62 (the first connection portion 61, the first bent portion 632a, the extending portion 631, the second bent portion 632b, and the second connection portion 62) are electrically connected in this order.

[0063] The second busbar 42b includes a second routing portion 63b as a second type routing portion 63. The second routing portion 63b includes an extending portion 631. The second routing portion 63b of the second busbar 42b is routed in the X direction or the Y direction from the first connection portion 61. In the second busbar 42b, the first connection portion 61, the second routing portion 63b (extending portion 631), and the second connection portion 62 are electrically connected in this order.

[0064] In this embodiment, the routing portions 63 (first routing portion 63a, second routing portion 63b) of some bus bars 42 are held by the base portion 41, and extend through the region R that overlaps with the electronic component 10 when viewed from the Z direction, across both sides of the region R. For example, at least a portion of the routing portion 63 extends linearly along the X direction. At least a portion of the routing portion 63 extends through the region R that overlaps with the electronic component 10 when viewed from the Z direction, across the +X direction side and the −X direction side of the region R. For example, the extension portion 631 extends through the region R that overlaps with the electronic component 10 when viewed from the Z direction, across the +X direction side and the −X direction side of the region R.

[0065] 5 and 8, in this embodiment, at least a portion of the first connection portion 61 of the busbar 42 is exposed to the outside of the base portion 41 on the upper surface side (the side of the first surface 51a of the flat portion 51). For example, the first connection portion 61 of the busbar 42 is exposed from the base portion 41 in at least a portion of the region R that overlaps with the electronic component 10. That is, the first connection portion 61 protrudes from the first surface 51a in the first direction (Z direction). In other words, the first surface 51a is recessed in the Z direction relative to the first connection portion 61. At this time, a portion of the side peripheral surface 42CS of the busbar 42 is exposed from the base portion 41. The side peripheral surface 42CS faces a direction intersecting the first direction. With this configuration, the first surface 51a is less likely to push up the connection components 20, 30 or the connecting busbar in the +Z direction. Since the contact area at the contact point between the connecting parts 20, 30 or the connecting bus bar and the bus bar 42 is more easily secured, the electrical connection between the connecting parts 20, 30 or the connecting bus bar and the bus bar 42 is more easily ensured.

[0066] Below, several examples of how the bus bars 42 are arranged will be described.

[0067] (1st wiring example) First, an example of routing of the first bus bar 42a will be described. The first bus bar 42a has a first connection portion 61, a second connection portion 62, and a first routing portion 63a. As shown in FIG. 1 again, the first connection portion 61 is located on the +X direction side of the electronic component 10 (electronic component 10M). The first connection portion 61 is electrically connected to a terminal 13B of the electronic component 10 via a connection component 20B, which is a first connection component 20 (connection component 20M). The second connection portion 62 is located on the -X direction side of the electronic component 10 (electronic component 10M). The second connection portion 62 is electrically connected to another electronic component 10 via a connection component 20, an external device via a connection component 30, or another subunit SU via a connecting bus bar. Note that when the electronic component 10 electrically connected to the first connection portion 61 is electronic component 10N, the first connection portion 61 is located on the -X direction side of the electronic component 10N. The electronic component 10N is electrically connected to another wiring board 40.

[0068] The routing portion 63 (first routing portion 63a) passes through the region R overlapping with the electronic component 10 when viewed from the Z direction, and extends across both sides of the region R. The first routing portion 63a is routed from the upper portion (first portion) to the lower portion (second portion) of the insulating base, and an extension portion 631 of the first routing portion 63a is exposed from the second surface 51b. For example, a portion of the first routing portion 63a extends linearly along the X direction. In this embodiment, the extension portion 631 of the first routing portion 63a extends linearly along the X direction. The extension portion 631 of the first routing portion 63a extends across the region R overlapping with the electronic component 10 (electronic component 10M) when viewed from the Z direction, across both the +X direction side and the −X direction side of the region R.

[0069] (Second wiring example) Next, an example of routing of the second bus bar 42b will be described. The second bus bar 42b has a first connection portion 61, a second connection portion 62, and a second routing portion 63b. As shown in Fig. 1, the first connection portion 61 is electrically connected to a terminal 13A of the electronic component 10 via a connection component 20A, which is a first connection component 20 (connection component 20M). The second connection portion 62 is electrically connected to another electronic component 10 via the connection component 20, to an external device via the connection component 30, or to another subunit SU via a connecting bus bar.

[0070] The bus bar 42b has a routing portion 63 (second routing portion 63b) that passes through a region R that overlaps with the electronic component 10 (electronic component 10M) when viewed from the Z direction and extends to both sides of the region R. The extension portion 631 of the first routing portion 63a is aligned in the -Z direction with the second routing portion 63b.

[0071] (Fastening member) Next, returning to Fig. 1, fastening member 43 will be described. Fastening member 43 is a component for fastening bus bar 42 to a component to which bus bar 42 is to be connected (connection component 20, connection component 30, or a bus bar for connection). Fastening member 43 is, for example, a crimp bolt fixed to bus bar 42. Fastening member 43 is an example of a "fastening portion."

[0072] In this embodiment, each of the first connection portion 61 and the second connection portion 62 of the bus bar 42 has a through hole 42h. The through hole 42h penetrates the bus bar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion and a head. The circumferential surface of the shaft portion has a thread groove. The head portion has a larger diameter than the shaft portion. The fastening member 43 is fixed to the bus bar 42 by crimping with the shaft portion inserted through the through hole 42h of the bus bar 42. With this fixation, the fastening member 43 is electrically and physically connected to the bus bar 42 with the shaft portion protruding from the through hole 42h of the bus bar 42 in the +Z direction. Note that the fastening member 43 is not limited to being fixed by crimping, and may be fixed to the bus bar 42 by welding or other methods.

[0073] In this embodiment, the connection part 20 is first fixed to the electronic component 10 by the fastening member 71 or the fastening member 72, and then attached to the fastening member 43 from the Z direction. For example, the shaft of the fastening member 43 is inserted into the second mounting hole 22h of the second part 22 of the connection part 20. Then, a fastening element such as a nut is engaged with the shaft of the fastening member 43 protruding from the second mounting hole 22h of the second part 22 of the connection part 20. This engagement fixes the second part 22 of the connection part 20 to the fastening member 43.

[0074] <4. Advantages> Consider an electrical connection unit in which the busbars are arranged in an upright position relative to the bottom wall of the housing as Comparative Example A. In this comparative example configuration, it may be difficult to reduce the width (height) of the upright busbars, for example, because the cross-sectional area of ​​the busbars is determined in order to function as wiring materials. If the electrical connection unit has a complex wiring path, the width of the upright busbars can become a bottleneck, making it difficult to reduce the height of the electrical connection unit.

[0075] On the other hand, in this embodiment, the wiring board 40 constituting the electrical connection unit 1 includes a base member (base portion 41) having an insulating base, a first bus bar 42 a held by the insulating base and including a wiring portion 63 (first wiring portion 63 a) routed from a first portion (upper portion SL) to a second portion (lower portion LL) of the insulating base, and a second bus bar 42 b held by the first portion (upper portion SL) of the insulating base, where, when viewed in the thickness direction (Z direction) of the insulating base, a portion of the first bus bar 42 a passes through an area overlapping with the second bus bar 42 b, at least a portion of the first bus bar 42 a extends in a plate-like shape along the insulating base, and at least a portion of the second bus bar 42 b extends in a plate-like shape along the insulating base. With this configuration, the wiring path (bus bar 42) is incorporated into the base member, and the first bus bar 42 a can have a three-dimensional wiring structure relative to the second bus bar 42 b. In a three-dimensional wiring structure made up of multiple bus bars 42, the wiring path of the first bus bar 42a can be the shortest path. In this case, at least a portion of the wiring path is formed on a plane, so the width of the bus bar is less likely to become a bottleneck compared to the structure of Comparative Example A, making it easier to reduce the height of the electrical connection unit 1.

[0076] In this embodiment, the routing portion 63 (first routing portion 63a) has an extension 631. The extension 631 is held by the second portion (lower portion LL) of the insulating base. When viewed in the thickness direction (Z direction), a portion of the extension 631 extends through a region overlapping with the second bus bar 42b. With this configuration, the routing path (bus bar 42) is incorporated into the base member, and the first bus bar 42a can have a three-dimensional routing structure relative to the second bus bar 42b. In a three-dimensional routing structure formed by multiple bus bars 42, the routing path of the first bus bar 42a can be the shortest path. In this case, at least a portion of the routing path is formed on a plane. Therefore, compared to the structure of Comparative Example A, the width of the bus bar is less likely to become a bottleneck, making it easier to reduce the height of the electrical connection unit 1.

[0077] In this embodiment, the extension 631 of the first wiring portion 63a is exposed from the base member (base portion 41) at the second portion (lower portion LL). With this configuration, at least a portion of the bus bar 42 other than the first connection portion 61 and the second connection portion 62, which are connected to other components, is exposed to the outside of the base portion 41 and functions as a surface that releases heat. In this case, the heat dissipation performance of the electrical connection unit 1 can be improved.

[0078] In this embodiment, the first bus bar 42a includes a first connection portion 61 electrically connected to an electronic component, a device, or a third bus bar, and the first connection portion 61 is held by the first portion (upper portion SL) and extends along the insulating base. With this configuration, the wiring board 40 can be used alone or can be connected to another subunit SU as appropriate.

[0079] In this embodiment, the first bus bar 42a includes a second connection portion 62 that is electrically connected to an electronic component, a device, or a third bus bar, and the second connection portion 62 is held by the first portion (upper portion SL) and extends along the insulating base. With this configuration, the wiring board 40 can be used alone or can be connected to another subunit SU as appropriate.

[0080] In this embodiment, the first routing portion 63a has at least one bent portion 632, and in the first busbar 42a, the first routing portion 63a extends across the first connection portion 61 and the second connection portion 62. This configuration can improve the degree of freedom in routing the first busbar 42a in the three-dimensional routing structure.

[0081] In this embodiment, the first bus bar 42a is integrated with the base member (base portion 41). With this configuration, the first bus bar 42a is integrated with the base portion 41. This integration makes it easier for the first bus bar 42a to be three-dimensionally routed along a better path (for example, a path with a shorter distance) without being obstructed by the presence of the electronic component 10.

[0082] Furthermore, the first bus bar 42a and the base member (base portion 41) can be handled as a single unit, which improves the workability of attaching the bus bar 42. This integration improves the ease of assembly of the electrical connection unit 1.

[0083] In this embodiment, the electrical connection unit 1 includes the wiring board 40 and an electronic component 10 (electronic component 10M) electrically connected to the first bus bar 42a. With this configuration, at least a portion of the wiring path is formed on a plane. Compared to the structure of Comparative Example A, the width of the bus bar is less likely to become a bottleneck, making it easier to reduce the height of the electrical connection unit 1.

[0084] (First Modification) In the above disclosure, the second connection portion 62 of the first bus bar 42a is held by the first portion (upper portion SL) of the base portion 41 and extends along the insulating base. On the other hand, as a modified example, the second connection portion 62 of the first bus bar 42a may be held by the second portion (lower portion LL) of the base portion 41 and extend along the insulating base. This configuration further improves the degree of freedom in the three-dimensional wiring structure of the first bus bar 42a.

[0085] (Second Modification) In the above disclosure, the insulating substrate provides insulation between the first bus bar 42a and the second bus bar 42b. Utilizing this function, as a modified example, each bus bar in the wiring board 40 may function as either a positive line or a negative line. For example, the first bus bar 42a is a bus bar included in either the positive line or the negative line of the electrical connection unit 1. For example, the second bus bar 42b is a bus bar included in the other of the positive line or the negative line of the electrical connection unit 1.

[0086] (Third Modification) The connection component 30 disclosed above electrically connects the external connection bus bar 76 to the bus bar 42 included in the wiring board 40. On the other hand, as a modified example, the external connection bus bar 76 may be directly connected to the first connection portion 61 and / or the second connection portion 62.

[0087] (Fourth Modification) In the above disclosure, the first routing portion 63a of the first bus bar 42a has at least one bent portion 632. On the other hand, as a modified example, instead of forming a vertical current path by the bent portion 632, a vertical current path may be formed by the conductive member 44.

[0088] FIG. 11 shows a wiring board 40B as this modification. The wiring board 40B includes, for example, a base portion 41, a plurality of bus bars 42, and a plurality of fastening members 43. In this modification, the wiring board 40B includes two bus bars 42. The two bus bars 42 include a fourth bus bar 42aa and a fifth bus bar 42bb. Like the first bus bar 42a, the fourth bus bar 42aa is a member that forms horizontal and vertical electrical paths. The fourth bus bar 42aa includes a first connecting portion 61, a third wiring portion 63aa, and a second connecting portion 62 (not shown). The third wiring portion 63aa includes an extending portion 631, a conductive member 44, and a plate portion 46. The conductive member 44 is located from the first portion (upper portion SL) to the second portion (lower portion LL) of the insulating base.

[0089] The plate portion 46 includes an extending portion 631. The plate portion 46 has a through hole 45h with which the conductive member 44 can be engaged. The third routing portion 63aa has a through hole 45h with which the conductive member 44 can be engaged. Each through hole 45h is formed in a part of the extending portion 631 of the third routing portion 63aa and in a part of the extending portion 631 of the plate portion 46. When the third routing portion 63aa and the plate portion 46 are electrically connected via the conductive member 44, the fourth bus bar 42aa forms electrical paths in the horizontal and vertical directions.

[0090] The fifth bus bar 42bb, like the second bus bar 42b, is a member that forms a horizontal current path. The fifth bus bar 42bb includes a first connection portion 61 (not shown), a second routing portion 63b, a second connection portion 62 (not shown), and an extension portion 64. The extension portion 64 is a plate-like portion that extends horizontally. The extension portion 64 is held by the upper portion SL of the base portion 41 and extends along the flat portion 51. The extension portion 64 is a portion of the bus bar 42 that is extended for the purpose of increasing the heat dissipation area and / or the heat capacity for heat storage (heat absorption). The extension portion 64 is a portion that is not used for electrical connection.

[0091] In this modification, for the purpose of improving heat dissipation, the plate portion 46 of the fourth bus bar 42aa may be exposed from the base portion 41 in the second portion (lower portion LL) of the insulating base. In this modification, the multiple bus bars may include the first bus bar 42a, the second bus bar 42b, the fourth bus bar 42aa, and the fifth bus bar 42bb.

[0092] (Fifth Modification) One or more bus bars 42 may have an extension portion 64 in addition to the first connection portion 61, the second connection portion 62, and the extension portion 631.

[0093] (Sixth Modification) The connection between electronic component 10 and bus bar 42 is not limited to connection via connection component 20. Electronic component 10 may be directly connected to bus bar 42 using a fastening member (e.g., a bolt or a screw) or welding. For example, terminal 13 of electronic component 10 may be brought into direct contact with bus bar 42 by welding or the like.

[0094] Several embodiments and modifications have been described above. However, the embodiments and modifications are not limited to the above examples. For example, multiple embodiments may be realized in combination with each other. The above-described embodiments can be implemented in various other forms, and various additions, omissions, substitutions, and modifications can be made without departing from the spirit and scope of the present disclosure. [Explanation of symbols]

[0095] 1 Electrical Connection Unit 10. Electronic Components 11 cases 11a Insulation rib 12 Component body 13 terminals 13A terminal 13B terminal 13h Mounting hole 14 Mounting part 14h mounting hole 10 First Electronic Parts 10M Electronic Components 10N Electronic Components 20 Connecting parts 21 Part 1 21h First mounting hole 22 Part 2 22h Second mounting hole 23 Part 3 20 First connecting part 20 Second connecting part 20A connecting parts 20B Connection parts 20M connecting parts 20N connecting parts 30 Connecting parts 31 Part 1 31h First mounting hole 32 Part 2 32h Second mounting hole 33 Part 3 30 Second connecting part 40 Wiring board 40e1 1st end 40e2 2nd end 40e3 3rd end 40e4 4th end 41 Base 42 Busbar 40B wiring board 42a 1st bus bar 42aa 4th bus bar 42b Second bus bar 42bb 5th bus bar 42CS side surface 42h through hole 43 Fastening members 44 Conductive material 45h through hole 46 Board part 51 Plane part 51a 1st page 51b 2nd side 61 First connection part 62 Second connection part 63a First wiring section 63aa 3rd wiring section 63b 2nd wiring section 64 Extension 71 Fastening members 72 Fastening members 73 Fastening members 76 External connection bus bar 76h Mounting hole 631 Extension section 632 Bend 632a 1st bend 632b 2nd bend AR area R region LL bottom SL upper part MU main body SU subunit

Claims

1. a base member having an insulating base; a first bus bar held by the insulating base and including a wiring portion that is routed from a first portion to a second portion of the insulating base; a second bus bar held by the first portion; Equipped with When viewed from the thickness direction of the insulating base, a portion of the first bus bar passes through a region where the first bus bar overlaps with the second bus bar, At least a portion of the first bus bar extends in a plate shape along the insulating base, At least a portion of the second bus bar extends in a plate shape along the insulating base. Wiring board.

2. The wiring portion has an extension portion, the extension portion is held by the second portion, When viewed from the thickness direction, a part of the extension portion extends through a region overlapping with the second bus bar. The wiring board according to claim 1 .

3. The extension portion is exposed from the base member at the second portion. The wiring board according to claim 2 .

4. the wiring portion further includes a conductive member electrically connected to the extension portion, The conductive member is located across from the first portion to the second portion. The wiring board according to claim 2 .

5. the first bus bar includes a first connection portion electrically connected to an electronic component, a device, or a third bus bar; the first connection portion is held by the first portion and extends along the insulating base; The wiring board according to any one of claims 1 to 4.

6. the first bus bar includes a second connection portion electrically connected to an electronic component, a device, or a third bus bar; the second connection portion is held by the first portion and extends along the insulating base portion; The wiring board according to claim 5 .

7. The wiring portion has at least one bent portion, In the first bus bar, the routing portion extends across the first connection portion and the second connection portion. The wiring board according to claim 6.

8. the first bus bar is integrated with the base member; The wiring board according to any one of claims 1 to 4.

9. the first bus bar is a bus bar included in either a positive electrode line or a negative electrode line, the second bus bar is a bus bar included in the other of the positive electrode line and the negative electrode line, the insulating base provides insulation between the first bus bar and the second bus bar. The wiring board according to any one of claims 1 to 4.

10. The wiring board according to any one of claims 1 to 4, an electronic component electrically connected to the first bus bar; Equipped with Electrical connection unit.

Images