Fastening member and electrical connection unit

Abstract

A fastening member of the electrical connection unit has a shaft portion, a base portion, and a heat storage portion. The shaft portion is inserted into a first mounting hole of a first member and a second mounting hole of a second member in a state where the first mounting hole and the second mounting hole overlap in a first direction. The shaft part is provided with thread teeth. When a direction intersecting the first direction is a second direction, the width of the base portion in the second direction is larger than the width of the shaft portion in the second direction. The base portion faces the first member or the second member in the first direction. The heat storage part is provided on the opposite side from the shaft part with respect to the base part. The heat storage part and the base part are integrally formed.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to a fastening member and an electrical connection unit. BACKGROUND

[0002] An electrical connection unit having an electronic component and a bus bar electrically connected to the electronic component is known.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Publication No. 2024-037492 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] However, an improvement in thermal characteristics is expected for the electrical connection unit.

[0008] One embodiment provides a fastening member and an electrical connection unit capable of achieving an improvement in thermal characteristics.

[0009] MEANS FOR SOLVING THE PROBLEMS

[0010] A fastening member of one embodiment is used for an electrical connection unit. The fastening member has a shaft portion, a base portion, and a heat storage portion. The shaft portion is inserted into a first mounting hole of a first member and a second mounting hole of a second member in a state where the first mounting hole and the second mounting hole overlap in a first direction. The shaft portion has a thread. A width of the base portion in a second direction which is a direction intersecting the first direction is larger than that of the shaft portion. The base portion faces the first member or the second member in the first direction. The heat storage portion is provided on a side opposite to the shaft portion with respect to the base portion. The heat storage portion is formed integrally with the base portion.

[0011] An electrical connection unit of one embodiment has at least one of a first member and a second member and a fastening member. The fastening member has a shaft portion, a base portion, and a heat storage portion. The shaft portion is inserted into a first mounting hole of the first member and a second mounting hole of the second member in a state where the first mounting hole and the second mounting hole overlap in a first direction. The shaft portion has a thread. A width of the base portion in a second direction which is a direction intersecting the first direction is larger than that of the shaft portion. The base portion faces the first member or the second member in the first direction. The heat storage portion is provided on a side opposite to the shaft portion with respect to the base portion. The heat storage portion is formed integrally with the base portion.

[0012] The fastening member of one embodiment is used for an electric connection unit. The fastening member has a first portion and a second portion. The first portion is inserted into a first mounting hole of a first member and a second mounting hole of a second member in a state where the first mounting hole and the second mounting hole overlap in a first direction. The first portion has a thread and engages with a nut. In a case where a direction intersecting the first direction is a second direction, a width of the second portion in the second direction is greater than a width of the first portion. The second portion faces the first member or the second member in the first direction. The second portion has a volume twice or more as large as the nut.

[0013] An electric connection unit of one embodiment has at least one of a first member and a second member and a fastening member. The fastening member has a first portion and a second portion. The first portion is inserted into a first mounting hole of the first member and a second mounting hole of the second member in a state where the first mounting hole and the second mounting hole overlap in a first direction. The first portion has a thread and engages with a nut. In a case where a direction intersecting the first direction is a second direction, a width of the second portion in the second direction is greater than a width of the first portion. The second portion faces the first member or the second member in the first direction. The second portion has a volume twice or more as large as the nut.

[0014] An electric connection unit of one embodiment has a fastening member, a heat dissipation member, and a heat conduction member. The fastening member has a first portion and a second portion. The first portion is inserted into a first mounting hole of a first member and a second mounting hole of a second member in a state where the first mounting hole and the second mounting hole overlap in a first direction. The first portion has a thread. In a case where a direction intersecting the first direction is a second direction, a width of the second portion in the second direction is greater than a width of the first portion. The second portion faces the first member or the second member in the first direction. The heat dissipation member faces the second portion from a side opposite to the first member and the second member. The heat conduction member is provided between the second portion and the heat dissipation member.

[0015] Effects of Invention

[0016] According to one embodiment, improvement in thermal characteristics can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a cross-sectional view illustrating an electric connection unit of a first embodiment.

[0018] Figure 2 FIG. 4 is a perspective view for describing a main body portion of the first embodiment.

[0019] Figure 3 This is a perspective view used to illustrate a sub-unit of the first embodiment.

[0020] Figure 4 This is a perspective view showing the electronic components and connecting components of the first embodiment.

[0021] Figure 5 This is a perspective view illustrating the wiring substrate of the first embodiment.

[0022] Figure 6 This is a perspective view showing a portion of the wiring substrate of the first embodiment, disassembled.

[0023] Figure 7 It is along Figure 3 The cross-sectional view of the structure shown along line F7-F7.

[0024] Figure 8 It is along Figure 3 The cross-sectional view of the structure shown along line F8-F8.

[0025] Figure 9 This is a perspective view showing other sub-units of the first embodiment.

[0026] Figure 10 This is a front view showing the electronic components of the first embodiment.

[0027] Figure 11 This is a perspective view showing the base component of the first embodiment.

[0028] Figure 12 This is a top view showing a sub-unit of the first embodiment.

[0029] Figure 13 It is along Figure 12 The cross-sectional view of the structure shown along line F13-F13.

[0030] Figure 14 This is a perspective view used to illustrate the fastening component of the first embodiment.

[0031] Figure 15 It is along Figure 12 The cross-sectional view of the structure shown along line F15-F15.

[0032] Figure 16 This is a cross-sectional view of a sub-unit showing a modified example of the first embodiment.

[0033] Figure 17 This is a perspective view showing a fastening component of a modified example of the first embodiment.

[0034] Figure 18is a perspective view showing a part of the subunit of the second embodiment.

[0035] Figure 19 is a perspective view showing a part of the subunit of the third embodiment.

[0036] Figure 20 is a perspective view showing a part of the subunit of the third embodiment.

[0037] Figure 21 is a cross-sectional view showing the subunit of the third embodiment.

[0038] Figure 22 is a cross-sectional view showing the subunit of the fourth embodiment. DETAILED DESCRIPTION

[0039] Hereinafter, embodiments will be described with reference to the drawings. In the following description, structures having the same or similar functions are designated by the same reference numerals. Also, sometimes repeated description of these structures will be omitted. In addition, the structures described below do not limit the scope of the embodiments.

[0040] In the present disclosure, the terms are defined as follows. "Connection" is not limited to mechanical connection, and can include electrical connection. That is, "connection" is not limited to the case where two elements as connection objects are directly connected, and can include the case where two elements as connection objects are connected with other elements interposed therebetween. "Accommodation" is not limited to the case where the entirety of a component is accommodated, and can include the case where only a part of a component is accommodated (a state where another part of the component protrudes). "Facing" means that imaginary projected images of two objects overlap each other in the case of being observed from a particular direction. That is, "facing" is not limited to the case where two objects directly face each other, and can include the case where two objects face each other in a state where other components are present between the two objects. "Parallel", "orthogonal", or "identical" can respectively include the case of "approximately parallel", "approximately orthogonal", or "approximately identical".

[0041] 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 a direction from a first end portion 110e1 of a metal plate 110 described later toward a second end portion 110e2 (refer to FIG. 1). Figure 2 The -X direction is a direction opposite to the +X direction. Hereinafter, in the case where the +X direction and the -X direction are not distinguished, it is simply referred to as the "X direction". The +Y direction and the -Y direction are directions intersecting (for example, orthogonal to) the X direction. The +Y direction is a direction from a third end portion 110e3 of the metal plate 110 described later toward a fourth end portion 110e4 (refer to FIG. 1). Figure 2). The -Y direction is a direction opposite to the +Y direction. Hereinafter, in the case where the +Y direction and the -Y direction are not distinguished, the "Y direction" is simply referred to. The +Z direction and the -Z direction are directions intersecting (for example, orthogonal to) the X direction and the Y direction. The +Z direction is a direction from the metal plate 110 described later toward the main body portion MU (refer to FIG. 1). The -Z direction is a direction opposite to the +Z direction. Hereinafter, in the case where the +Z direction and the -Z direction are not distinguished, the "Z direction" is simply referred to. The Z direction is an example of the "first direction". One of the X direction and the Y direction is an example of the "second direction". The other of the X direction and the Y direction is an example of the "third direction". Figure 2 ). The -Z direction is a direction opposite to the +Z direction. Hereinafter, in the case where the +Z direction and the -Z direction are not distinguished, the "Z direction" is simply referred to. The Z direction is an example of the "first direction". One of the X direction and the Y direction is an example of the "second direction". The other of the X direction and the Y direction is an example of the "third direction".

[0042] Hereinafter, in the case where the X direction and the Y direction are not distinguished, the "horizontal direction" is sometimes referred to. Hereinafter, the Z direction is sometimes referred to as the "vertical direction". In addition, hereinafter, the +Z direction side is sometimes referred to as the "up", and the -Z direction side is sometimes referred to as the "down". However, these expressions are expressions for convenience of explanation, and do not limit the direction of gravity of the electrical connection unit 1 (the setting posture of the electrical connection unit 1).

[0043] (First Embodiment)

[0044] <1. Structure of Electrical Connection Unit>

[0045] Figure 1 is a cross-sectional view showing the electrical connection unit 1 of the embodiment. The electrical connection unit 1 is, for example, an on-vehicle device mounted on a vehicle such as an EV (Electric Vehicle), an HEV (Hybrid Electric Vehicle), or a PHEV (Plug-in Hybrid Electric Vehicle). The electrical connection unit 1 can also be referred to as an "electrical connection box" or a "junction box", for example. However, the electrical connection unit 1 is not limited to a box-type device.

[0046] The electrical connection unit 1 has, for example, a frame 5, a main body portion MU, a metal plate 110, a plurality of insulating covers 119 (refer to Figure 2 ), and a plurality of heat conductive members 120 (refer to Figure 2 ).

[0047] <2. Frame>

[0048] First, the frame 5 will be described. The frame 5 forms the outer shape of the electrical connection unit 1. The frame 5 includes, for example, a base 6 and a cover 7. The base 6 is a member that covers the main body portion MU and the metal plate 110 from below. The base 6 is, for example, a plate shape in the horizontal direction or a bowl shape that is open in the +Z direction. The base 6 is, for example, made of synthetic resin. The cover 7 is a member that covers the main body portion MU and the metal plate 110 from above. The cover 7 is, for example, a bowl shape that is open in the -Z direction. The cover 7 is, for example, made of synthetic resin. In the present embodiment, the frame 5 is formed in a box shape by combining the base 6 and the cover 7. In addition, the shape of the frame 5 is not limited to the above example. For example, the metal plate 110 described later can also function as part or all of the base 6. In addition, the frame 5 can be omitted.

[0049] In the present embodiment, the electrical connection unit 1 includes a first region (first space) R1 and a second region (second space) R2. The first region R1 is a region that places importance on heat dissipation. In the first region R1, for example, the electronic component 10S that generates a large amount of heat is disposed. On the other hand, the second region R2 is a region that places importance on mountability. In the second region R2, for example, the electronic component 10T that generates a smaller amount of heat than the electronic component 10S and / or requires a more complex mounting structure than the electronic component 10S is disposed. However, these contents do not limit the contents of the electrical connection unit 1 of the present disclosure. For example, the electronic component 10T can also generate a larger amount of heat than the electronic component 10S.

[0050] <3. Main Body Portion>

[0051] Next, the main body portion MU will be described.

[0052] Figure 2 is a perspective view for illustrating the main body portion MU. The main body portion MU is a portion that assumes a main function of the electrical connection unit 1 (for example, switching of the electrical connection state or overcurrent protection). In the present embodiment, the main body portion MU is divided into a plurality of sub-units SU. The main body portion MU is formed, for example, by connecting a plurality of sub-units SU. In the present embodiment, the main body portion MU has two sub-units SU (sub-units SUS, SUT). Each sub-unit SU can also be referred to as a "circuit structure".

[0053] The sub-unit SUS has a first function in terms of electricity. The sub-unit SUS includes, for example, a plurality of electronic components 10S and a wiring substrate 40S. The plurality of electronic components 10S are electrically connected to the wiring substrate 40S. The base plate 41S (described later) included in the sub-unit SUS is an example of a "first base member".

[0054] The sub-unit SUT has an electrical second function. The second function is, for example, a function different from the first function. The sub-unit SUT includes, for example, a plurality of electronic components 10T and a wiring structure 40T. The plurality of electronic components 10T are electrically connected to the wiring structure 40T. A base member 41T (described later) included in the sub-unit SUT is an example of a "second base member".

[0055] In the present embodiment, the sub-unit SUS is a sub-unit SU that places importance on heat dissipation. The sub-unit SUS is disposed in the first region R1 of the electrical connection unit 1 described above. The sub-unit SUS faces the first region A1 of the metal plate 110 described later in the Z direction.

[0056] On the other hand, the sub-unit SUT is a sub-unit SU that places importance on mountability. The sub-unit SUT is disposed, for example, on the +Y direction side with respect to the sub-unit SUS. The sub-unit SUT is disposed in the second region R2 of the electrical connection unit 1 described above. The sub-unit SUT faces the second region A2 of the metal plate 110 described later in the Z direction. Hereinafter, the electronic components 10S and the electronic components 10T are not distinguished and are simply referred to as "electronic components 10".

[0057] Further, instead of the example described above, the main body MU can not be divided into a plurality of sub-units SU. For example, the plurality of sub-units SU can be integrally formed. For example, the base plate 41S of the wiring substrate 40S and the base member 41T of the wiring structure 40T described later can be integrally formed from one piece of member.

[0058] <4. Configuration of sub-unit SUS>

[0059] Next, the structure of the sub-unit SUS will be described.

[0060] Figure 3 is a perspective view for illustrating the sub-unit SUS. The sub-unit SUS includes, for example, a plurality of electronic components 10, a plurality of connection members 20, and a wiring substrate 40S. The connection member 20 is a member that forms a vertical power supply path. The connection member 20 can also be referred to as a "vertical wiring member".

[0061] <4.1 Electronic component>

[0062] First, the electronic component 10 will be described. The electronic component 10 is an electronic component mounted in accordance with a function required for each sub-unit SU. The electronic component 10 is, for example, also a connector, a fuse, a relay (for example, a mechanical relay or a semiconductor relay), a capacitor, a branch member, various sensors (for example, a current sensor or a voltage sensor), an electronic control unit, or an electronic component unit in which two or more of these are unified. However, the type of the electronic component 10 is not limited to the example described above. The electronic component 10 is, for example, a heating component that generates heat when power is supplied.

[0063] In the present embodiment, the plurality of electronic components 10 includes an electronic component 10S that generates a large amount of heat at the time of energization. The electronic component 10S is a relay (for example, a mechanical relay or a semiconductor relay), a fuse, or a current sensor (for example, a current sensor having a shunt resistor), or the like. However, the kind of the electronic component 10S is not limited to the above-described examples.

[0064] Figure 4 is a perspective view that shows the electronic component 10 and the connecting component 20. The electronic component 10 is, for example, an electronic component in which a plurality of terminals 13 are arranged and disposed at one end portion of the electronic component 10. The electronic component 10 has, for example, a housing 11, a component main body portion 12, a plurality of terminals 13, and a plurality of mounting portions 14.

[0065] (Housing)

[0066] The housing 11 is an outer contour component that forms a large portion of the outer shape of the electronic component 10. The housing 11 is, for example, made of synthetic resin and has insulating properties. The housing 11 accommodates the component main body portion 12. In addition, the housing 11 and the component main body portion 12 can be integrally formed.

[0067] (Component main body portion)

[0068] The component main body portion 12 is a portion that bears the main function of the electronic component 10. For example, in the case where the electronic component 10 is a relay, the component main body portion 12 includes a switching portion (for example, a contact portion) that switches between an on state and an off state. For example, in the case where the electronic component 10 is a fuse, the component main body portion 12 includes a fuse portion that is fused in the case where an overcurrent flows. For example, in the case where the electronic component 10 is a capacitor, the component main body portion 12 includes a portion that accumulates electric charge.

[0069] (Terminal)

[0070] The terminal 13 is an electric connection portion that is exposed to the outside of the housing 11. The terminal 13 is electrically connected to the component main body portion 12 inside the housing 11. In the present embodiment, the electronic component 10 includes a terminal 13A and a terminal 13B as the plurality of terminals 13. One of the terminal 13A and the terminal 13B is a positive electrode side terminal. The other of the terminal 13A and the terminal 13B is a negative electrode side terminal. One of the terminal 13A and the terminal 13B is an example of a “first terminal”. The other of the terminal 13A and the terminal 13B is an example of a “second terminal”.

[0071] In the present embodiment, the terminal 13A and the terminal 13B are provided at one end portion in the horizontal direction (for example, the Y direction) of the electronic component 10. The terminal 13A and the terminal 13B are arranged side by side in the horizontal direction (for example, the X direction). The terminal 13A and the terminal 13B each face the horizontal direction (for example, the Y direction). Each of the terminals 13 has a mounting hole 13h in which a fastening member 71 (for example, a screw or a bolt) described later is installed. The mounting hole 13h is open in the horizontal direction (for example, the Y direction). An inner peripheral surface of the mounting hole 13h of the electronic component 10 has a screw groove. In addition, in the present disclosure, the "mounting hole" is not limited to a hole having a screw groove, and can be a hole having no screw groove. Further, in the present disclosure, the "mounting hole" is not limited to a hole having a bottom, and can be a through hole.

[0072] (Mounting portion)

[0073] The mounting portion 14 is a portion for fixing the electronic component 10. The mounting portion 14 has a mounting hole 14h in which a fastening member 116 (for example, a screw or a bolt, refer to Figure 8 ) described later is installed. The mounting hole 14h is open in the Z direction. The mounting hole 14h is a through hole through which the fastening member 116 passes. The object to be fixed by the mounting portion 14 is described later.

[0074] <4.2 Connection member>

[0075] Next, the connection member 20 is described. The connection member 20 is a member that electrically connects the electronic component 10 and the wiring substrate 40S. The connection member 20 forms a part of the power supply path in the subunit SUS. The connection member 20 is made of metal (for example, copper, copper alloy, aluminum, or aluminum alloy). The connection member 20 can also be referred to as a "metal member".

[0076] In the present embodiment, the connection member 20 electrically connects the electronic component 10 and the bus bar 42 (refer to Figure 3 ) included in the wiring substrate 40S. In the present embodiment, the length L12 of the connection member 20 in the longitudinal direction (for example, the Y direction) of the electronic component 10 is shorter than the length L11 of the electronic component 10 in the longitudinal direction. The connection member 20 has, for example, a first portion 21 and a second portion 22.

[0077] (First portion)

[0078] The first portion 21 of the connection member 20 is a portion connected to the terminal 13 of the electronic component 10. The first portion 21 is a plate-shaped or cuboid-shaped portion extending in the Z direction. The first portion 21 extends in the Z direction along one end portion (for example, an end portion in the Y direction) of the electronic component 10. The first portion 21 is a standing portion that stands in the Z direction with respect to the wiring substrate 40S (for example, with respect to the bus bar 42 described later). The first portion 21 is adjacent to the electronic component 10 in the horizontal direction (for example, the Y direction). For example, the first portion 21 is adjacent to the terminal 13 of the electronic component 10 in the horizontal direction (for example, the Y direction), and is connected to the terminal 13 of the electronic component 10 in the horizontal direction (for example, the Y direction).

[0079] The first portion 21 of the connection member 20 has a first mounting hole 21h through which the fastening member 71 (for example, a screw or a bolt) passes. The first mounting hole 21h is open in the horizontal direction (for example, the Y direction). The first portion 21 is physically and electrically connected to the terminal 13 of the electronic component 10 by the fastening member 71 passing through the first mounting hole 21h and engaging with the mounting hole 13h of the terminal 13 of the electronic component 10.

[0080] (Second portion)

[0081] The second portion 22 of the connection member 20 is a portion connected to the bus bar 42 (refer to Figure 3 ). The second portion 22 protrudes from the end portion of the first portion 21 on the -Z direction side toward the horizontal direction (for example, the Y direction). The second portion 22 is a plate portion along the horizontal direction. The second portion 22 is adjacent to the bus bar 42 in the Z direction, and is connected to the bus bar 42 in the Z direction. The second portion 22 of the connection member 20 is mounted from the Z direction to the fastening member 43 (for example, a screw or a bolt, refer to Figure 8 ) protruding in the +Z direction from the bus bar 42, and is physically and electrically connected to the bus bar 42. In the present embodiment, the second portion 22 of the connection member 20 has a second mounting hole 22h through which the fastening member 43 passes. The second mounting hole 22h is open in the Z direction. The fastening member 43 passes through the second mounting hole 22h of the second portion 22. Further, the second portion 22 is fixed to the bus bar 42 by the engagement member 44 (for example, a nut, refer to Figure 3 ) engaging with the end portion of the fastening member 43 passing through the second mounting hole 22h. In the present embodiment, the connection member 20 formed in an L shape by the first portion 21 and the second portion 22.

[0082] In the present embodiment, the bus bar 42 is arranged at a position (for example, a position apart in the Z direction) apart from the terminal 13 of the electronic component 10. The connection component 20 is arranged between the electronic component 10 and the bus bar 42. In the present disclosure, "the connection component is arranged between the electronic component and the bus bar" is not limited to a case where a part of the connection component is positioned between the electronic component and the bus bar when viewed in the X direction or the Y direction. "The connection component is arranged between the electronic component and the bus bar" can also correspond to a case where a part of the connection component is positioned between the electronic component and the bus bar when viewed in a direction inclined with respect to the X direction or the Y direction. The connection component 20 electrically connects the terminal 13 of the electronic component 10 and the bus bar 42.

[0083] <4.3 Wiring substrate>

[0084] Next, the wiring substrate 40S will be described.

[0085] Figure 5 is a perspective view for illustrating the wiring substrate 40S. The wiring substrate 40S is a component that forms at least a part of a power supply path between a plurality of electronic components 10 (for example, a plurality of electronic components 10S) and / or at least a part of a power supply path between an electronic component 10 (for example, an electronic component 10S) included in a subunit SUS and an electronic component 10 included in another subunit SU (for example, a subunit SUT). In the present disclosure, "wiring substrate" refers to a wiring structure of a substrate type. "Substrate type" refers to a board shape when viewed as a whole regardless of a fine shape. Note that, in the present disclosure, "board shape", "sheet shape", or "plane" are not limited to a case where it is completely flat, and can include a case where a fixed structure, a rib, or the like that locally projects in the Z direction is present, a case where a concave-convex shape following the thickness of a bus bar is present on a surface, or the like. In the present embodiment, the wiring substrate 40S is a board shape along the X direction and the Y direction.

[0086] The wiring substrate 40S includes, for example, a base plate 41S, one or more (for example, a plurality) bus bars 42, and a plurality of fastening components 43. In the present embodiment, the base plate 41S and the plurality of bus bars 42 are integrated by insert molding. For example, after the fastening component 43 is fixed to the bus bar 42, the bus bar 42 is insert molded with the base plate 41S, and thus the wiring substrate 40S is formed as a one-piece component. That is, the bus bar 42 is integrated with the base plate 41S without using a fastening component such as a screw or a bolt. Furthermore, the wiring substrate 40S can be formed by another structure instead of insert molding.

[0087] Figure 6This is a perspective view showing a portion of the wiring substrate 40S exploded. Hereinafter, for ease of explanation, the substrate 41S, busbar 42, and fastening member 43 will be described with reference to the exploded view of a portion of the wiring substrate 40S.

[0088] <4.3.1 Base plate>

[0089] The substrate plate 41S is a support component that integrally supports a plurality of busbars 42 arranged horizontally at intervals. The substrate plate 41S is, for example, made of synthetic resin and has insulating properties. The substrate plate 41S provides electrical insulation between the plurality of busbars 42. The substrate plate 41S is an example of a "substrate component." The substrate plate 41S can also be referred to as an "insulating substrate." The substrate plate 41S, for example, has a planar portion 51, a frame portion 52, and a plurality of fixing portions 53 (see reference). Figure 9 ).

[0090] (Plane section)

[0091] The planar portion 51 is a plate-shaped portion formed in the base plate 41S. The planar portion 51 is plate-shaped along the horizontal direction. The planar portion 51 forms the main portion of the base plate 41S. The planar portion 51 forms the base (insulating base) of the base plate 41S. In this embodiment, the planar portion 51 extends throughout the entire width of the base plate 41S in the X direction and throughout the entire width of the base plate 41S in the Y direction, except for the frame portion 52 of the base plate 41S.

[0092] The planar portion 51 has a first surface 51a and a second surface 51b (see reference). Figure 7 The first surface 51a is a surface facing the +Z direction. The first surface 51a is a plane along the horizontal direction. The first surface 51a faces multiple electronic components 10 (e.g., multiple electronic components 10S). The second surface 51b is located on the opposite side of the first surface 51a. The second surface 51b is a surface facing the -Z direction. The second surface 51b is a plane along the horizontal direction. The second surface 51b faces the metal plate 110 (see reference). Figure 2 The thickness direction (plate thickness direction) of the planar portion 51 is the Z direction. In this embodiment, the thickness T11 of the planar portion 51 in the Z direction is smaller than the thickness T1 of the busbar 42 in the Z direction (for example, the thickness of the horizontal plate portion 42p in the Z direction described later) (see reference). Figure 7 In addition, the thickness T11 of the planar portion 51 in the Z direction can be the same as the thickness T1 of the busbar 42 in the Z direction, or it can be larger than the thickness T1 of the busbar 42 in the Z direction.

[0093] The flat portion 51 has, for example, one or more (for example, a plurality of) accommodation portions 55 that accommodate the bus bars 42, respectively. The plurality of accommodation portions 55 are formed separately from each other in the X direction or the Y direction. Each of the accommodation portions 55 is, for example, a through-hole that penetrates the flat portion 51 in the Z direction. Note that the accommodation portion 55 can also be a recess provided to the first face 51a or the second face 51b of the flat portion 51 and recessed in the Z direction instead of a through-hole. Note that in the present disclosure, “the accommodation portion penetrates the flat portion in the first direction (Z direction)” can include a case where a part of the entire length of the accommodation portion 55 penetrates the flat portion 51 in the Z direction (for example, the remaining part of the accommodation portion 55 can be a recess recessed in the Z direction, or can be a form in which it is provided inside the base plate 41S without being exposed to the outside of the base plate 41S). Also, in the present disclosure, “the accommodation portion is recessed in the first direction (Z direction)” can include a case where a part of the entire length of the accommodation portion 55 is recessed in the Z direction (for example, the remaining part of the accommodation portion 55 can be a through-hole that penetrates the flat portion 51 in the Z direction, or can be a form in which it is provided inside the base plate 41S without being exposed to the outside of the base plate 41S). Each of the accommodation portions 55 has an outer shape that corresponds to the shape of the bus bar 42 accommodated therein, when viewed in the Z direction.

[0094] (ledge portion)

[0095] The ledge portion 52 is provided to the peripheral end portion of the base plate 41S. The ledge portion 52 is a rib for reinforcement that protrudes upward and downward from the end portion of the flat portion 51 (refer to Figure 7 ). The Z-direction width (thickness) H11 of the ledge portion 52 is, for example, less than half of the Z-direction width (thickness) H12 of the electronic component 10 (refer to Figure 7 ). Note that the ledge portion 52 can also be omitted.

[0096] (fixing portion)

[0097] The fixing portion 53 is a portion that is fixed to the metal plate 110 (refer to Figure 8 ). The fixing portion 53 has a mounting hole 53h that penetrates the base plate 41S in the Z direction. The fastening member 115 (for example, a screw or a bolt) described later passes through the mounting hole 53h. This will be described later.

[0098] <4.3.2 Bus bar>

[0099] The bus bar 42 is a wiring member (an electrical connection member) included in the wiring substrate 40S. The bus bar 42 is, for example, a wiring member for electrically connecting a plurality of electronic components (for example, a plurality of electronic components 10S). Alternatively, the bus bar 42 can be a wiring member for electrically connecting the electronic component 10 (for example, the electronic component 10S) and an electronic component 10 included in another sub unit SU (for example, the sub unit SUT). The bus bar 42 is made of metal (for example, copper, copper alloy, aluminum, or aluminum alloy) and has electrical conductivity.

[0100] At least a portion of each bus bar 42 is in a plate shape along the horizontal direction. At least a portion of each bus bar 42 is housed in the housing portion 55 and extends along the planar portion 51. That is, at least a portion of each bus bar 42 extends along the first face 51a of the planar portion 51. At least a portion of each bus bar 42 extends in the horizontal direction within the housing portion 55. Hereinafter, the portion of each bus bar 42 that extends in a plate shape along the horizontal direction will be sometimes referred to as a "horizontal plate portion 42p". The horizontal plate portion 42p is an example of a "plate portion". The bus bar 42 is a member that forms a current path in the horizontal direction. The bus bar 42 can also be referred to as a "horizontal wiring member". Each bus bar 42 has, for example, a connection portion 61, a connection portion 62, and an extension portion 63.

[0101] The connection portion 61 is located at the middle of the bus bar 42 or the first end portion of the bus bar 42. The connection portion 61 is a portion that is connected to the electronic component 10 (for example, the electronic component 10S) directly or via the connection member 20. The connection portion 61 includes, for example, a portion that overlaps the connection member 20 when viewed in the Z direction. The connection portion 61 is adjacent to the connection member 20 in the Z direction and is connected to the connection member 20 in the Z direction. Instead of the above example, the connection portion 61 can be, for example, adjacent to the terminal 13 of the electronic component 10 in the Z direction and be connected to the terminal 13 of the electronic component 10 directly in the Z direction.

[0102] The connection portion 62 is located at the middle of the bus bar 42 or the second end portion of the bus bar 42. The connection portion 62 is a portion that is connected to another electronic component 10 directly or via another connection member 20. Instead of the above example, the connection portion 62 can be connected to another bus bar 42 (for example, a bus bar 42 included in another sub unit SU) or a bus bar 76 for external connection (see Figure 2 ).

[0103] The extension portion 63 extends from the connection portion 61 in the X direction or the Y direction. The extension portion 63 is provided between the connection portion 61 and the connection portion 62. The extension portion 63 extends in a manner that covers the connection portion 61 and the connection portion 62. The extension portion 63 connects the connection portion 61 and the connection portion 62.

[0104] In the present embodiment, the horizontal plate portion 42p includes at least all of the connecting portion 61 and a part of the extending portion 63. That is, at least all of the connecting portion 61 and a part of the extending portion 63 are housed in the housing portion 55 and are located on the same plane.

[0105] <4.3.3 Fastening member>

[0106] Next, the fastening member 43 will be described.

[0107] Figure 7 is along the Figure 3 is a sectional view of the F7-F7 line of the structure shown in FIG. 7. The fastening member 43 is a member for fixing the bus bar 42 and the connecting member 20 corresponding to the bus bar 42. The fastening member 43 is, for example, a rivet bolt fixed to the bus bar 42. The fastening member 43 is an example of a "fastening portion".

[0108] In the present embodiment, at least one of the connecting portion 61 and the connecting portion 62 of the bus bar 42 has a mounting hole 42h. The mounting hole 42h is, for example, a through hole that penetrates the bus bar 42 in the Z direction. The fastening member 43 is, for example, a bolt having a shaft portion 43a and a head portion 43b. The peripheral surface of the shaft portion 43a has a screw groove. The diameter of the head portion 43b is larger than the diameter of the shaft portion 43a. The fastening member 43 is fixed to the bus bar 42 with the head portion 43b in a state where the shaft portion 43a penetrates the mounting hole 42h of the bus bar 42. By this fixing, the fastening member 43 is electrically and physically connected to the bus bar 42 in a state where the shaft portion 43a protrudes from the mounting hole 42h of the bus bar 42 in the +Z direction. In addition, the fastening member 43 is not limited to rivet fixing, but can be fixed to the bus bar 42 by welding or other methods.

[0109] In the present embodiment, the connecting member 20 is mounted to the fastening member 43 in the Z direction in a state where it is first fixed to the electronic member 10 by the fastening member 71. For example, the connecting member 20 causes the shaft portion 43a of the fastening member 43 to be inserted into the second mounting hole 22h of the second portion 22. Then, the engaging member 44 (for example, a nut) is caused to engage with the shaft portion 43a of the fastening member 43 protruding from the second mounting hole 22h of the second portion 22 of the connecting member 20. The engaging member 44 is mounted to the shaft portion 43a in the Z direction. By this engagement, the second portion 22 of the connecting member 20 is fixed to the fastening member 43.

[0110] (Thermally conductive member)

[0111] Here, the heat conducting member 120 is first described. The heat conducting member 120 is a member for transferring heat emitted from the electronic component 10 (e.g., the electronic component 10S) when energized and / or heat (Joule heat) emitted from the bus bar 42 itself when energized to the metal plate 110. The heat conducting member 120 is, for example, a heat conducting sheet (e.g., a heat conducting silicone sheet) having elasticity. The heat conducting member 120 is formed of a material having a higher thermal conductivity than the base plate 41S (or the base member 41T described later), for example. However, the heat conducting member 120 is not limited to the above example, and can be a heat conducting member formed of a heat conducting gel or another material. In the present embodiment, the heat conducting member 120 has insulating properties.

[0112] In the present embodiment, the heat conducting member 120 is provided locally in the wiring substrate 40S (refer to FIG. 8). For example, the heat conducting member 120 is disposed at a position overlapping a portion of the bus bar 42 when viewed in the Z direction. The heat conducting member 120 is disposed between the bus bar 42 and the planar portion 111 of the metal plate 110 described later. For example, the heat conducting member 120 is disposed between the exposed portion 42u of the bus bar 42 and the planar portion 111 of the metal plate 110, and is in contact with the exposed portion 42u of the bus bar 42 and the planar portion 111 of the metal plate 110, respectively. The heat conducting member 120 transfers heat transferred from the electronic component 10 (e.g., the electronic component 10S) to the bus bar 42 and / or heat emitted from the bus bar 42 from the bus bar 42 to the planar portion 111 of the metal plate 110. Figure 2

[0113] In the present embodiment, the heat conducting member 120 is disposed at a position overlapping a portion of the bus bar 42 when viewed in the Z direction in the vicinity of the electronic component 10 (e.g., the electronic component 10S). In the present embodiment, the heat conducting member 120 is disposed at a position overlapping the connection member 20 when viewed in the Z direction. In other words, the heat conducting member 120 is disposed at a position overlapping the connection portion 61 or the connection portion 62 of the bus bar 42 when viewed in the Z direction. The heat conducting member 120 transfers heat moved from the electronic component 10S to the bus bar 42 via the connection member 20 from the bus bar 42 to the planar portion 111 of the metal plate 110.

[0114] <4.4 Wiring Substrate and Electronic Component Fixing Structure>

[0115] Next, a fixing structure of the wiring substrate 40S and the electronic component 10 is described.

[0116] Figure 8 is a cross-sectional view along the F8-F8 line of the structure shown in FIG. 8. The metal plate 110 has a fixing portion 112 and a fixing portion 113, in addition to the planar portion 111 described later, for example. Figure 3

[0117] ​​The fixing portion 112 is a fixing portion for fixing the base plate 41S to the metal plate 110. The fixing portion 112 is provided at a position corresponding to the fixing portion 53 of the base plate 41S when viewed in the Z direction. The fixing portion 112 is a boss of a cylindrical shape or a prismatic shape that protrudes in the +Z direction from the planar portion 111 of the metal plate 110. The fixing portion 112 has an engagement hole 112h that is open in the +Z direction. The inner peripheral surface of the engagement hole 112h has a threaded groove.

[0118] As described above, the fixing portion 53 of the base plate 41S has the mounting hole 53h. The fastening member 115 (e.g., a screw or a bolt) passes through the mounting hole 53h. When the fastening member 115 that passes through the mounting hole 53h of the fixing portion 53 of the base plate 41S engages with the engagement hole 112h of the fixing portion 112 of the metal plate 110, the base plate 41S is fixed to the metal plate 110.

[0119] The fixing portion 113 is a fixing portion for directly fixing the electronic component 10 (e.g., the electronic component 10S) to the metal plate 110 without passing through the base plate 41S. The fixing portion 113 is provided at a position corresponding to the mounting portion 14 of the electronic component 10 when viewed in the Z direction. The fixing portion 113 is a boss of a cylindrical shape or a prismatic shape that protrudes in the +Z direction from the planar portion 111. The fixing portion 113 has an engagement hole 113h that is open in the +Z direction. The inner peripheral surface of the engagement hole 113h has a threaded groove.

[0120] In the present embodiment, the planar portion 51 of the base plate 41S has a through-hole 51h. The through-hole 51h penetrates the planar portion 51 in the Z direction. The through-hole 51h is provided at a position corresponding to the fixing portion 113 of the metal plate 110 when viewed in the Z direction. The fixing portion 113 of the metal plate 110 protrudes through the through-hole 51h of the base plate 41S to a position that is the same as the first face 51a of the planar portion 51 or a position that is on the +Z direction side of the first face 51a of the planar portion 51. The mounting portion 14 of the electronic component 10 contacts the fixing portion 113 at a position that is the same as the first face 51a of the planar portion 51 or a position that is on the +Z direction side of the first face 51a of the planar portion 51.

[0121] The fastening member 116 (e.g., a screw or a bolt) passes through the mounting hole 14h of the mounting portion 14 of the electronic component 10 from the +Z direction side. When the fastening member 116 that passes through the mounting hole 14h of the mounting portion 14 of the electronic component 10 engages with the engagement hole 113h of the fixing portion 113 of the metal plate 110, the electronic component 10 is fixed to the metal plate 110 without passing through the base plate 41S. Furthermore, instead of the example described above, the electronic component 10 can be fixed to a fixing portion provided in the base plate 41S.

[0122] <5. Structure of sub-unit SUT>

[0123] Next, the structure of the sub unit SUT will be described.

[0124] Figure 9 is a perspective view showing the sub unit SUT. The sub unit SUT includes, for example, a plurality of electronic components 10, a wiring structure body 40T, an auxiliary base member 101 (refer to Figure 13 ).

[0125] <5.1 Electronic Component>

[0126] First, the electronic component 10 will be described. The plurality of electronic components 10 includes a plurality of electronic components 10TA (only one is illustrated in Figure 9 ) and a plurality of electronic components 10TB (only one is illustrated in Figure 9 ). Further, the plurality of electronic components 10 can have only either of the electronic components 10TA and the electronic components 10TB.

[0127] The electronic component 10TA is one example of the above-described electronic component 10T. The electronic component 10TA is an electronic component whose heat generation amount at the time of energization is smaller than that of the electronic component 10S. On the other hand, the electronic component 10TB is another example of the above-described electronic component 10T. The electronic component 10TB is an electronic component whose mountability is poor (for example, a complicated implementation structure is required) compared to the electronic component 10S. The electronic component 10TB has, for example, a terminal 13 (refer to Figure 13 ) projecting in the -Z direction toward the planar portion 111 of the metal plate 110. The electronic component 10TB has, for example, a heat generation amount at the time of energization smaller than that of the electronic component 10S. Further, as described above, the heat generation amount of the electronic component 10T can be larger than that of the electronic component 10S.

[0128] Hereinafter, the electronic component 10TA and the electronic component 10TB will be simply referred to as "electronic component 10T" without distinguishing them. The electronic component 10T is, for example, also a connector, a fuse, a capacitor, a branch component, various sensors (for example, a current sensor or a voltage sensor), an electronic control unit, or an electronic component unit in which two or more of them are unitized. However, the kind of the electronic component 10T is not limited to the above-described examples.

[0129] Figure 10This is a front view showing the electronic component 10TA. The electronic component 10TA is, for example, an electronic component with multiple terminals 13 arranged at both ends in the horizontal direction of the electronic component 10TA. In this embodiment, terminals 13A and 13B are separately arranged at both ends in the Y direction of the electronic component 10TA. Terminals 13A and 13B protrude from the center of the housing 11 in the Z direction towards the horizontal direction (e.g., the +Y or -Y direction). Each terminal 13 is, for example, a plate portion along the horizontal direction. Each terminal 13 has a mounting hole 13h through which a fastening member 43 (e.g., a screw or bolt) or a fastening member 90 described later passes. The mounting hole 13h is open in the Z direction. The inner circumferential surface of the mounting hole 13h does not have a threaded groove. The mounting hole 13h is a through hole that passes through the terminal 13 in the Z direction.

[0130] <5.2 Wiring Structure>

[0131] Next, return Figure 9 The wiring structure 40T will be described below. The wiring structure 40T is a component that forms at least a portion of the power path between multiple electronic components 10 (e.g., multiple electronic components 10T) and / or at least a portion of the power path between electronic components 10 (e.g., electronic components 10T) included in a subunit SUT and electronic components 10 included in other subunits SU (e.g., subunit SUS). The wiring structure 40T includes, for example, a base component 41T, one or more (e.g., multiple) busbars 42, multiple fastening components 43, and a fastening component 90 with a heat storage function. Regarding the fastening component 43, since the content is the same as that described in the subunit SUS, repeated descriptions are omitted.

[0132] <5.2.1 Base Components>

[0133] Figure 11 This is a perspective view showing the base component 41T. The base component 41T is a support component that integrally supports a plurality of busbars 42 arranged horizontally and spaced apart from each other. The base component 41T is made of, for example, synthetic resin and has insulating properties. The base component 41T electrically insulates the plurality of busbars 42, for example, by ribs (not shown). The base component 41T can also be referred to as an "insulating substrate". The base component 41T has a three-dimensional structure that is thicker in the Z direction than the base plate 41S included in the subunit SUS. The base component 41T includes, for example, a support wall 81, a frame portion 85 (peripheral wall portion), and a fixing portion 87.

[0134] (Supporting wall)

[0135] The support wall 81 is, for example, a plate-like wall section along the horizontal direction. Multiple busbars 42 are disposed on the support wall 81 and supported from below by the support wall 81 (see reference). Figure 9Furthermore, the support wall 81 supporting the busbar 42 is not limited to a wall portion along the horizontal direction, but may also be a grid-like wall portion formed by multiple ribs extending in the Z direction. In this embodiment, fastening members 43 and 90 are installed on the support wall 81. Fastening members 43 and 90 protrude from the support wall 81 in the +Z direction.

[0136] (The housing section that contains electronic components)

[0137] In this embodiment, the base component 41T has a receiving portion 84A that opens towards the +Z direction. The receiving portion 84A is, for example, a recess in the Z direction of a part of the support wall 81, or a through hole that penetrates the support wall 81 in the Z direction. When viewed from the Z direction, the receiving portion 84A has a shape corresponding to the shape of the housing 11 (i.e., the main body portion 12) of the electronic component 10 (e.g., the electronic component 10T). At least a portion of the electronic component 10 (e.g., the electronic component 10T) (e.g., at least a portion of the main body portion 12) is received in the receiving portion 84A. At least a portion of the electronic component 10 received in the receiving portion 84A is located on the -Z direction side compared to the support wall 81.

[0138] (Frame)

[0139] A frame portion 85 is provided at the peripheral end of the base member 41T. The frame portion 85 is a rib (peripheral wall portion) extending in the Z direction at the peripheral end of the base member 41T. The width (thickness) H21 of the frame portion 85 (peripheral wall portion) in the Z direction is, for example, more than half of the width (thickness) H22 in the Z direction of the electronic component 10 (e.g., electronic component 10TA) (see reference). Figure 13 Additionally, the frame 85 can also be omitted.

[0140] (Fixed part)

[0141] The fixing part 87 is the part that is fixed to the metal plate 110 (see reference). Figure 13 The fixing part 87 faces the fixing part 112 of the metal plate 110 in the Z direction. The fixing part 87 has a mounting hole 87h that passes through the base member 41T in the Z direction. The fastening member 115 (e.g., a screw or bolt) passes through the mounting hole 87h. When the fastening member 115 passing through the mounting hole 87h engages with the engaging hole 112h of the fixing part 112 of the metal plate 110, the base member 41T is fixed to the metal plate 110.

[0142] <5.2.2 Busbar>

[0143] Next, the busbar 42 included in the wiring structure 40T will be described.

[0144] Figure 12is a plan view of the subunit SUT. The bus bars 42 are wiring members (electrical connection members) included in the wiring structure body 40T. The bus bars 42 are, for example, wiring members for electrically connecting a plurality of electronic components 10 (e.g., a plurality of electronic components 10T). Alternatively, the bus bars 42 can be wiring members for connecting the electronic components 10 (e.g., the electronic components 10T) to electronic components 10 included in other subunits SU (e.g., the subunit SUS). In the present embodiment, a plurality of bus bars 42 are supported from below by the base member 41T and are arranged at positions away from the metal plate 110. The bus bars 42 are, for example, arranged directly below the terminals 13 of the electronic components 10. The bus bars 42 overlap the component main body portions 12 of the electronic components 10 when viewed in the X direction or the Y direction (see FIG. 6). Figure 15

[0145] The plurality of bus bars 42 include, for example, four bus bars 42E, 42F, 42G, and 42I. The four bus bars 42E, 42F, 42G, and 42I are arranged in the horizontal direction at intervals from each other. The four bus bars 42E, 42F, 42G, and 42I include portions arranged on the same plane. At least a portion of each bus bar 42 is a horizontal plate portion 42p. In the present embodiment, each bus bar 42 is a plate shape extending in the horizontal direction. The horizontal plate portion 42p of each bus bar 42 includes a connection portion 61, a connection portion 62, and an extension portion 63. In the present embodiment, the subunit SUT has the electronic component 10D as one of the electronic components 10TA.

[0146] The connection portion 61 of the bus bar 42E is connected to a bus bar 42 included in the subunit SUS. Similarly, the connection portion 61 of the bus bar 42F is connected to a bus bar 42 included in the subunit SUS. The connection portion 62 of the bus bar 42F is physically and electrically connected to the terminal 13A of the electronic component 10D. For example, the terminal 13A of the electronic component 10D is placed on the horizontal plate portion 42p of the bus bar 42F, and thereby connected to the connection portion 62 of the bus bar 42F.

[0147] ​The connecting portion 61 of busbar 42G is physically and electrically connected to the terminal 13B of electronic component 10D. For example, the terminal 13B of electronic component 10D is connected to the connecting portion 61 of busbar 42G via a horizontal plate portion 42p mounted on busbar 42G. The connecting portion 61 of busbar 42G is an example of a "first connecting portion". The connecting portion 62 of busbar 42G is physically and electrically connected to the external connecting busbar 76. The connecting portion 62 of busbar 42G is connected to an external device via busbar 76. The connecting portion 62 of busbar 42G is an example of a "second connecting portion". Busbar 76 is an example of an "external connecting component". Alternatively, the connecting portion 62 of busbar 42G can also replace busbar 76 for physical and electrical connection to the terminals 13 of other electronic components 10.

[0148] The connecting portion 61 of busbar 42I is connected to busbar 42 included in subunit SUS. The connecting portion 62 of busbar 42I is physically and electrically connected to terminal 13A of electronic component 10T (not shown).

[0149] <5.3 Auxiliary Base Components>

[0150] Next, the auxiliary base component 101 will be described.

[0151] Figure 13 It is along Figure 12 The diagram shows a cross-sectional view along line F13-F13 of the structure. The auxiliary substrate component 101 is, for example, made of synthetic resin and has insulating properties. A plurality of wirings 102 are provided on the surface of the auxiliary substrate component 101. The wirings 102 are, for example, conductive layers (metal layers) provided on the surface of the auxiliary substrate component 101. The auxiliary substrate component 101 is disposed in the Z direction between the substrate component 41T and the planar portion 111 of the metal plate 110. The auxiliary substrate component 101 extends laterally towards the electronic component 10TB from the -Z direction. The terminals 13 of the electronic component 10TB are electrically connected to the wirings 102 provided on the auxiliary substrate component 101 at a position between the substrate component 41T and the planar portion 111 of the metal plate 110. The auxiliary substrate component 101 is an example of a "third substrate component".

[0152] <5.4 Fastening components with heat storage function>

[0153] <5.4.1 Functions of Fastening Components>

[0154] Next, the fastening component 90 with heat storage function will be described.

[0155] Figure 14This is a perspective view illustrating the fastening component 90. The fastening component 90 is a component used for fastening multiple components, possessing a greater heat storage capacity than a typical fastening component (e.g., fastening component 43), and for physically and electrically connecting them. The fastening component 90 is made of metal and is conductive. The material of the fastening component 90 may be copper, copper alloy, aluminum, aluminum alloy, steel, stainless steel, magnesium, magnesium alloy, titanium, or titanium alloy, but is not limited to these. The fastening component 90 may also be referred to as a "heat storage component" or a "metal component."

[0156] Fastening member 90 secures the first component to the second component. For example, fastening member 90 secures electronic component 10 to busbar 42. Electronic component 10 is an example of the "first component." Connecting member 20 is an example of the "second component." It should be noted that in this disclosure, "fastening" or "fixing" is not limited to the case of fastening or fixing by a single component (fastening member 90), but may also include the case of fastening or fixing by combining with other components (such as engaging member 44 such as a nut).

[0157] Furthermore, the first and second components are not limited to the examples described above. For example, the first component can be any one of the electronic component 10, a connecting component (e.g., connecting component 20) mounted on the electronic component 10, a busbar 42, or a busbar 76 for external connection. For example, the second connection can be any one of the electronic component 10, a connecting component (e.g., connecting component 20) mounted on the electronic component 10, a busbar 42, or a busbar 76 for external connection. For example, the fastening component 90 can secure the busbar 42 to other busbars 42 (or the busbar 76 for external connection), or it can fasten the connecting component 20 mounted on the electronic component 10 to the busbar 42.

[0158] Hereinafter, as an example of a fastening component 90, the fastening component 90 that fastens the electronic component 10 (first component) to the busbar 42 (second component) will be described. However, in the following description, the terms "electronic component 10" and "busbar 42" may be appropriately replaced with other components based on the above-mentioned principle.

[0159] like Figure 14 As shown, the terminal 13 of the electronic component 10 has a mounting hole 13h. The mounting hole 13h is, for example, a through hole that passes through the terminal 13 in the Z direction. The inner circumferential surface of the mounting hole 13h does not have a threaded groove. However, as described above, in this disclosure, "mounting hole" is not limited to a hole without a threaded groove, and can also be a hole with a threaded groove. Furthermore, in this disclosure, "mounting hole" is not limited to a through hole, and can also be a bottomed hole. For example, the mounting hole 13h can also be a hole with a threaded groove that engages with the shaft portion 91 of the fastening component 90. Additionally, the mounting hole 13h can also be a bottomed hole. The mounting hole 13h is an example of a "first mounting hole".

[0160] Likewise, the connecting portion 61 of the bus bar 42 has a mounting hole 42h. The mounting hole 42h is, for example, a through-hole that penetrates the bus bar 42 in the Z direction. The inner peripheral surface of the mounting hole 42h does not have a threaded groove. However, the mounting hole 42h can also be a hole having a threaded groove for engagement of the shaft portion 91 of the fastening member 90. In addition, the mounting hole 42h can also be a bottomed hole. The mounting hole 42h is an example of a "second mounting hole". In a case where either one of the mounting hole 13h of the electronic component 10 and the mounting hole 42h of the bus bar 42 is a hole having a threaded groove, the engagement member 44 can be omitted.

[0161] <5.4.2 Structure of fastening member>

[0162] Next, the structure of the fastening member 90 will be described. The fastening member 90 includes, for example, a shaft portion 91, a base portion 92, and a heat storage portion 93.

[0163] (SHAFT PORTION)

[0164] The shaft portion 91 is a cylindrical portion having a threaded tooth Sc on the outer peripheral surface. The shaft portion 91 extends in the Z direction. The shaft portion 91 is inserted into the mounting hole 13h of the electronic component 10 and the mounting hole 42h of the bus bar 42 in a state where the mounting hole 13h of the electronic component 10 and the mounting hole 42h of the bus bar 42 overlap in the Z direction. In the present embodiment, the tip end portion of the shaft portion 91 that passes through the mounting hole 13h of the electronic component 10 and the mounting hole 42h of the bus bar 42 passes through the washer 45 and engages with the engagement member 44 (e.g., a nut).

[0165] (BASE PORTION)

[0166] The base portion 92 is a portion that is thicker than the shaft portion 91 in the horizontal direction. The base portion 92 is, for example, a flat cylindrical shape. The width W2 (e.g., diameter) of the base portion 92 in the Y direction (or the X direction) is larger than the width W1 (e.g., diameter) of the shaft portion 91 in the Y direction (or the X direction). The width W2 (e.g., diameter) of the base portion 92 in the Y direction (or the X direction) is larger than the width W13h (e.g., diameter) of the mounting hole 13h of the electronic component 10 in the Y direction (or the X direction). The width W2 (e.g., diameter) of the base portion 92 in the Y direction (or the X direction) is larger than the width W42h (e.g., diameter) of the mounting hole 42h of the bus bar 42 in the Y direction (or the X direction). The base portion 92 is disposed on the -Z direction side with respect to the terminal 13 of the electronic component 10 and the bus bar 42. The base portion 92 faces the terminal 13 of the electronic component 10 or the bus bar 42 in the Z direction.

[0167] (HEAT STORAGE PORTION)

[0168] The heat storage portion 93 is a portion provided to secure a large heat capacity. The heat storage portion 93 is provided on the opposite side of the shaft portion 91 with respect to the base portion 92. The heat storage portion 93 is formed integrally with the base portion 92. In the present embodiment, the heat storage portion 93 is a solid cylindrical portion extending in the Z direction. In the present embodiment, the volume (heat capacity) of the heat storage portion 93 is two times or more the volume (heat capacity) of the engagement member 44 (e.g., nut).

[0169] In the present embodiment, the heat storage portion 93 bulges in the horizontal direction with respect to the base portion 92. The width W3 of the heat storage portion 93 in the Y direction (or the X direction) is larger than the width W2 of the base portion 92 in the Y direction (or the X direction). With this structure, a horizontal step ST is formed between the base portion 92 and the heat storage portion 93. However, the width W3 of the heat storage portion 93 in the Y direction (or the X direction) can be the same as the width W2 of the base portion 92 in the Y direction (or the X direction). That is, the step ST can not exist between the base portion 92 and the heat storage portion 93. In the present embodiment, the width W3 of the heat storage portion 93 in the Y direction (or the X direction) is two times or more the width W1 of the shaft portion 91 in the Y direction (or the X direction).

[0170] In the present embodiment, the thickness T3 of the heat storage portion 93 in the Z direction is larger than the thickness T2 of the base portion 92 in the Z direction. For example, the thickness T3 of the heat storage portion 93 in the Z direction is two times or more the thickness T2 of the base portion 92 in the Z direction. The end portion of the heat storage portion 93 on the -Z direction side is located in the vicinity of the planar portion 111 of the metal plate 110, for example, beyond the Z-directional midpoint between the bus bar 42 and the planar portion 111 of the metal plate 110 fastened by the fastening member 90.

[0171] In the present embodiment, the total of the thickness T2 of the base portion 92 in the Z direction and the thickness T3 of the heat storage portion 93 in the Z direction is larger than the thickness T1 of the horizontal plate portion 42p of the bus bar 42 in the Z direction (refer to Figure 15 ). For example, the thickness T3 of the heat storage portion 93 in the Z direction is larger than the thickness T1 of the horizontal plate portion 42p of the bus bar 42 in the Z direction. For example, the thickness T3 of the heat storage portion 93 in the Z direction is two times or more the thickness T1 of the horizontal plate portion 42p of the bus bar 42 in the Z direction.

[0172] According to another aspect, the fastening member 90 includes a first portion 90a and a second portion 90b.

[0173] The first portion 90a is a portion formed by the above-described shaft portion 91. The first portion 90a is a cylindrical portion extending in the Z direction. The outer peripheral surface of the first portion 90a has a screw thread Sc. The first portion 90a passes through the washer 45 and engages with the engagement member 44 (e.g., nut).

[0174] The second part 90b is formed by the base 92 and the heat storage part 93 described above. The second part 90b is a cylindrical part including a portion with an enlarged diameter having a step ST. In this embodiment, the volume (heat capacity) of the second part 90b is more than twice the volume (heat capacity) of the engaging member 44 (e.g., a nut).

[0175] Furthermore, the fastening member 90 may be provided instead of corresponding to one terminal 13 of the electronic component 10, and may be provided corresponding to both terminals 13A of the electronic component 10 respectively. This is also the case in the variations and other embodiments described below.

[0176] <5.4.3 Structures related to fastening components>

[0177] Figure 15 It is along Figure 12 The diagram shows a cross-sectional view along line F15-F15 of the structure. In this embodiment, the base component 41T has a retaining portion 88 that holds the heat storage portion 93. The retaining portion 88 includes, for example, a first portion 88a and a second portion 88b.

[0178] The first part 88a is located in the Z direction between the busbar 42 (or the terminal 13 of the electronic component 10) and the heat storage unit 93. The first part 88a is adjacent to the base 92 in the X or Y direction. The first part 88a faces the step ST between the base 92 and the heat storage unit 93 in the Z direction. The first part 88a faces the heat storage unit 93 in the Z direction and supports the heat storage unit 93 in the Z direction.

[0179] The second part 88b is, for example, a cylindrical portion extending from the periphery of the first part 88a in the -Z direction. The second part 88b faces the heat storage part 93 in the X or Y direction. The second part 88b surrounds the heat storage part 93 along its outer periphery. The second part 88b supports the heat storage part 93 in the horizontal direction.

[0180] In this embodiment, the fastening member 90 is integrally formed with the base member 41T by insert molding. For example, the fastening member 90 is integrally formed with the retaining portion 88 by insert molding and is supported by the retaining portion 88.

[0181] In the present embodiment, the heat storage portion 93 is located between the shaft portion 91 and the planar portion 111 of the metal plate 110. That is, the metal plate 110 faces the heat storage portion 93 from the opposite side of the terminal 13 or the bus bar 42 of the electronic component 10. The thermally conductive portion 120 is arranged between the heat storage portion 93 and the planar portion 111 of the metal plate 110. The thermally conductive portion 120 is in contact with the heat storage portion 93 and the planar portion 111 of the metal plate 110, for example. The thermally conductive portion 120 is elastically deformed while being sandwiched between the heat storage portion 93 and the planar portion 111 of the metal plate 110. The thermally conductive portion 120 thermally connects the heat storage portion 93 and the planar portion 111 of the metal plate 110.

[0182] The fastening member 90 is, for example, a heat absorbing member that increases the thermal capacity of the energization path included in the sub unit SUT. The fastening member 90, for example, stores (absorbs) a part of the heat from the external device toward the electronic component 10 (for example, the electronic component 10T) via the bus bar 76 for external connection. Instead of the above, the fastening member 90 can also store (absorb) at least a part of the heat emitted from the electronic component 10 and / or at least a part of the heat emitted from the bus bar 42 itself. In the case where the fastening member 90 is used as a heat storage member (heat absorbing member), the fastening member 90 can also not be thermally connected to the metal plate 110.

[0183] In the present embodiment, the fastening member 90 also functions as, for example, a thermally conductive portion that transmits a part of the heat from the external device toward the electronic component 10 (for example, the electronic component 10T) via the bus bar 76 for external connection to the planar portion 111 of the metal plate 110 described later. In the present embodiment, the fastening member 90 is provided in correspondence with the terminal 13B of the electronic component 10. According to this structure, a part of the heat from the bus bar 76 for external connection toward the electronic component 10 through the bus bar 42 is more likely to move to the fastening member 90 than to reach the electronic component 10.

[0184] Further, instead of the above, the fastening member 90 can also be a thermally conductive portion that transmits at least a part of the heat emitted from the electronic component 10 and / or at least a part of the heat emitted from the bus bar 42 itself to the planar portion 111 of the metal plate 110. The planar portion 111 of the metal plate 110 is arranged separately from the bus bar 42 in the Z direction. The planar portion 111 of the metal plate 110 faces the bus bar 42 in the Z direction. The planar portion 111 of the metal plate 110 is an example of the "opposite portion".

[0185] <5.4.4 Modification of the fastening member>

[0186] Next, a modification of the fastening member 90 will be described. Note that the structure other than the following description is the same as that of the first embodiment.

[0187] Figure 16is a sectional view showing a sub unit SUT of a modification example. The fastening member 90 has the shaft portion 91, the base portion 92, and the heat accumulating portion 93, like the first embodiment. In the example shown, the thickness T3 of the heat accumulating portion 93 in the Z direction is the same degree as the thickness T2 of the base portion 92 in the Z direction. However, in the present modification example, the thickness T3 of the heat accumulating portion 93 in the Z direction can be larger than the thickness T2 of the base portion 92 in the Z direction, like the first embodiment. Figure 16 In the example shown, the thickness T3 of the heat accumulating portion 93 in the Z direction is the same degree as the thickness T2 of the base portion 92 in the Z direction. However, in the present modification example, the thickness T3 of the heat accumulating portion 93 in the Z direction can be larger than the thickness T2 of the base portion 92 in the Z direction, like the first embodiment.

[0188] Figure 17 is a perspective view showing the fastening member 90 of a modification example. In the present modification example, the heat accumulating portion 93 is also bulged in the horizontal direction with respect to the base portion 92. The width W3 of the heat accumulating portion 93 in the Y direction (or the X direction) is larger than the width W2 of the base portion 92 in the Y direction (or the X direction).

[0189] In the present modification example, the base portion 92 has a shape of a true circle (a perfect circle) when viewed in the Z direction. On the other hand, the heat accumulating portion 93 is larger than the base portion 92 when viewed in the Z direction, and has a shape different from a true circle (a perfect circle) or a regular polygon. For example, the heat accumulating portion 93 includes four straight portions 93a and four corner portions 93b provided between the four straight portions 93a when viewed in the Z direction. The corner portions 93b are circular arc shapes bulged toward the outside in the horizontal direction. The heat accumulating portion 93 has a shape having an area (volume) larger than a true circle (a perfect circle) having the same maximum width in the X direction and the Y direction as the heat accumulating portion 93 when viewed in the Z direction. With this structure, the heat capacity of the fastening member 90 is further increased. In addition, the heat accumulating portion 93 can also have a shape of a regular polygon (for example, a regular quadrilateral) or the like when viewed in the Z direction.

[0190] <6. Metal plate and insulating cover>

[0191] Next, the metal plate 110 and the insulating cover 119 will be described. Figure 2

[0192] <6.1 Metal plate>

[0193] The metal plate 110 is a member that ensures the rigidity of the electrical connection unit 1 and improves the heat dissipation property of the electrical connection unit 1. The metal plate 110 is made of metal (for example, made of aluminum or an aluminum alloy). The metal plate 110 is an example of a "heat dissipation member". The metal plate 110 can also be referred to as a "metal member" or a "rigidity member".

[0194] ​The metal plate 110 is rectangular in the X direction and the Y direction. The metal plate 110 has a first end portion 110e1, a second end portion 110e2, a third end portion 110e3, and a fourth end portion 110e4. The first end portion 110e1 and the second end portion 110e2 are a pair of end portions in the long side direction of the metal plate 110, and are separated in the X direction. The third end portion 110e3 and the fourth end portion 110e4 are a pair of end portions in the short side direction of the metal plate 110, and are separated in the Y direction. The metal plate 110 includes, for example, a flat portion 111, the plurality of fixing portions 112 described above (refer to Figure 8 ), and the plurality of fixing portions 113 described above (refer to Figure 8 ).

[0195] The flat portion 111 is a portion of the metal plate 110 that is formed in a plate shape. The flat portion 111 is plate-shaped in the horizontal direction. The flat portion 111 forms a main portion of the metal plate 110. The flat portion 111 forms a base portion (metal base portion) of the metal plate 110. The flat portion 111 has a size that covers both of the sub-units SU from below.

[0196] In the present embodiment, the flat portion 111 has a first region A1 and a second region A2. The first region A1 is, for example, a region on the -Y direction side in the flat portion 111. The sub-unit SU described above faces the first region A1 of the flat portion 111 when viewed in the Z direction. That is, the plurality of electronic components 10S and the base plate 41S included in the sub-unit SU face the first region A1 of the flat portion 111 in the Z direction.

[0197] The second region A2 is, for example, a region on the +Y direction side in the flat portion 111. The sub-unit ST described above faces the second region A2 of the flat portion 111 when viewed in the Z direction. That is, the plurality of electronic components 10T and the base portion 41T included in the sub-unit ST face the second region A2 of the flat portion 111 in the Z direction.

[0198] <6.2 Insulating Cover>

[0199] The insulating cover 119 is a member for preventing a finger from contacting a power supply path of the sub-unit SU. The insulating cover 119 is, for example, made of synthetic resin, and has insulating properties. The insulating cover 119 is, for example, a box shape that is open on the -Z direction side. The insulating cover 119 has a plurality of air holes 119h. The insulating cover 119 covers a part or all of the corresponding sub-unit SU. In addition, the insulating cover 119 is not limited to a box-shaped member, and can be a sheet-shaped member that covers the power supply path of the main body portion MU. In addition, the insulating cover 119 can be omitted.

[0200] <7. Advantage>

[0201] As a comparative example, a structure in which the fastening member 90 is not present is considered. In such a structure, in a case where sufficient heat capacity is not ensured within the electric connection unit, a case where a large temperature rise occurs in a portion within the electric connection unit and / or thermal interference with the electronic component becomes large, and the like are likely to occur. For example, in a case where a large current flows through the transition, a case where a large temperature rise occurs in a portion within the electric connection unit and / or thermal interference with the electronic component becomes large, and the like are likely to occur. Therefore, it is sometimes difficult to achieve an improvement in the thermal characteristics of the electric connection unit.

[0202] In the present embodiment, the electric connection unit 1 has the fastening member 90. The fastening member 90 has the shaft portion 91, the base portion 92, and the heat storage portion 93. The shaft portion 91 is inserted into the first mounting hole of the first component (for example, the electronic component 10) and the second mounting hole of the second component (for example, the bus bar 42) in a state where the first mounting hole and the second mounting hole overlap in the first direction (Z direction). The shaft portion 91 has the screw thread Sc. The width of the base portion 92 in the X direction or the Y direction is larger than that of the shaft portion 91. The base portion 92 faces the first component or the second component in the Z direction. The heat storage portion 93 is provided on the opposite side of the shaft portion 91 with respect to the base portion 92. The heat storage portion 93 is formed integrally with the base portion 92.

[0203] According to such a structure, an improvement in the heat storage function (heat absorption function) can be achieved using the member used as the fastening member 90. According to the structure, at least a portion of the heat transferred in the bus bar 42 can be temporarily stored (absorbed) by the fastening member 90. According to the structure, a large temperature rise occurring in a portion within the electric connection unit 1 and / or thermal interference with the electronic component 10 becoming large can be suppressed. By this action, an increase in the number of components of the electric connection unit 1 can be suppressed, and an improvement in the thermal characteristics (for example, heat dissipation or heat storage) of the electric connection unit 1 can be achieved.

[0204] In the present embodiment, the width W3 of the heat storage portion 93 in the Y direction is larger than the width W2 of the base portion 92 in the Y direction. According to such a structure, it is easy to ensure a large heat capacity in the heat storage portion 93. In the structure, a further improvement in the thermal characteristics of the electric connection unit 1 can be achieved.

[0205] In the present embodiment, the thickness T3 of the heat storage portion 93 in the Z direction is larger than the thickness T2 of the base portion 92 in the Z direction. According to such a structure, it is easy to ensure a large heat capacity in the heat storage portion 93. In the structure, a further improvement in the thermal characteristics of the electric connection unit 1 can be achieved.

[0206] In the present embodiment, the heat storage portion 93 has an outer shape different from a circle and a regular polygon when viewed from the Z direction. According to such a structure, it is easy to secure a large heat capacity for the heat storage portion 93 in a limited arrangement area. In this structure, further improvement of the thermal characteristics of the electrical connection unit 1 can be achieved.

[0207] In the present embodiment, the base member 41T has a holding portion 88 that holds the heat storage portion 93. The holding portion 88 has a first portion 88a and a second portion 88b. The first portion 88a is located between the above-described first member and the heat storage portion 93 in the Z direction. The second portion 88b faces the heat storage portion 93 in the Y direction. According to such a structure, the holding portion 88 that holds the heat storage portion 93 is achieved by the difference in thickness between the base portion 92 and the heat storage portion 93. According to this structure, it is easy to achieve improvement in durability (for example, impact resistance) and the like of the electrical connection unit 1.

[0208] In the present embodiment, the electrical connection unit 1 has a metal plate 110 and a heat conducting member 120. The metal plate 110 faces the heat storage portion 93 from a side opposite to the above-described first member and the above-described second member. The heat conducting member 120 is arranged between the heat storage portion 93 and the metal plate 110. According to such a structure, it is easy to release heat moved from the above-described first member or the above-described second member to the fastening member 90 to the outside through the metal plate 110. According to this structure, further improvement of the thermal characteristics of the electrical connection unit 1 can be achieved.

[0209] In the present embodiment, the fastening member 90 has a first portion 90a and a second portion 90b. The first portion 90a is inserted into a first mounting hole (for example, the mounting hole 13h) of the first member (for example, the electronic member 10) and a second mounting hole (for example, the mounting hole 42h) of the second member (for example, the bus bar 42) in a state in which the first mounting hole and the second mounting hole overlap in the first direction (the Z direction). The first portion 90a has a screw thread Sc and is engaged with a nut (for example, the engagement member 44). The second portion 90b is larger in width in the X direction or the Y direction than the first portion 90a. The second portion 90b faces the above-described first member or the above-described second member in the Z direction. The second portion 90b has a volume twice or more as large as the above-described nut. According to such a structure, it is easy to secure a large heat capacity for the fastening member 90. With this structure, further improvement of the thermal characteristics of the electrical connection unit 1 can be achieved.

[0210] (Second Embodiment)

[0211] Next, the second embodiment will be described. The second embodiment differs from the first embodiment in that the fastening member 90 is mounted to the connection member 130. In addition, the structures described below are the same as those of the first embodiment.

[0212] Figure 18is a perspective view showing a part of the sub unit SUT of the second embodiment broken down. In the present embodiment, the electric connection unit 1 has a first electronic component 10A and a second electronic component 10B as the plurality of electronic components 10. The first electronic component 10A and the second electronic component 10B can be the same kind of electronic component 10, or can be different kinds of electronic component 10.

[0213] In the present embodiment, the electric connection unit 1 has a connection component 130. The connection component 130 is a component that is disposed between the electronic component 10 and the bus bar 42 and connects the electronic component 10 and the bus bar 42. In the present embodiment, the connection component 130 is a connection component that connects a plurality of electronic components (for example, the electronic components 10A, 10B) and one bus bar 42. In the present embodiment, the connection component 130 is an example of a "first component". The bus bar 42 is an example of a "second component". The connection component 130 is made of metal (for example, made of copper, made of copper alloy, made of aluminum, or made of aluminum alloy). The connection component 130 has, for example, a first portion 131, a second portion 132, and a third portion 133.

[0214] The first portion 131 is a portion that is physically and electrically connected to the terminal 13 of the first electronic component 10A. The first portion 131 is, for example, a plate portion along the horizontal direction. The first portion 131 faces the terminal 13 of the first electronic component 10A in the Z direction. The first portion 131 has a mounting hole 131h that faces the mounting hole 13h of the terminal 13 of the first electronic component 10A. The first portion 131 is fixed to the terminal 13 of the first electronic component 10A by, for example, the fastening component 43 that passes through the mounting hole 13h and the mounting hole 131h and the engagement component 44 that engages with the fastening component 43.

[0215] The second portion 132 is a portion that is physically and electrically connected to the terminal 13 of the second electronic component 10B. The second portion 132 is, for example, a plate portion along the horizontal direction. The second portion 132 faces the terminal 13 of the second electronic component 10B in the Z direction. The second portion 132 has a mounting hole 132h that faces the mounting hole 13h of the terminal 13 of the second electronic component 10B. The second portion 132 is fixed to the terminal 13 of the second electronic component 10B by, for example, the fastening component 43 that passes through the mounting hole 13h and the mounting hole 132h and the engagement component 44 that engages with the fastening component 43.

[0216] The third portion 133 is a portion that connects the first portion 131 and the second portion 132 and is physically and electrically connected to the fastening member 90. The third portion 133 is, for example, a plate portion in the horizontal direction. The third portion 133 is provided between the first portion 131 and the second portion 132. The third portion 133 has a mounting hole 133h that faces the mounting hole 42h of the bus bar 42. The inner peripheral surface of the mounting hole 133h has, for example, no thread groove. The mounting hole 133h is a through hole that penetrates the connection member 130 in the Z direction. However, the mounting hole 133h can also be a hole that has a thread groove and is engaged with the shaft portion 91 of the fastening member 90. In addition, the mounting hole 133h can also be a bottomed hole. In the present embodiment, the mounting hole 133h is an example of a "first mounting hole". The mounting hole 42h of the bus bar 42 is an example of a "second mounting hole".

[0217] In the present embodiment, the shaft portion 91 of the fastening member 90 is inserted into the mounting hole 313h of the connection member 130 and the mounting hole 42h of the bus bar 42 in a state in which the mounting hole 133h of the connection member 130 and the mounting hole 42h of the bus bar 42 overlap in the Z direction. The fastening member 90 is thermally connected to the plurality of electronic components 10A, 10B via the connection member 130.

[0218] In addition, in the present embodiment, as in the first embodiment, the fastening member 90 is thermally connected to the planar portion 111 of the metal plate 110 via the thermally conductive member 120. The fastening member 90 also functions, for example, as a thermally conductive member that collects a portion of the heat generated by the plurality of electronic components 10 and transmits it to the planar portion 111 of the metal plate 110.

[0219] According to such a structure, the temperature rise of the plurality of electronic components 10A, 10B can be suppressed by one fastening member 90. By this action, an improvement in the electrical characteristics of the electrical connection unit 1 can be achieved.

[0220] (Third Embodiment)

[0221] Next, the third embodiment will be described. The third embodiment differs from the first embodiment in that an additional heat storage member 140 is provided. In addition, the structures described below are the same as those of the first embodiment.

[0222] Figure 19 is a perspective view showing a portion of the sub-unit SUT of the third embodiment. Figure 20is a perspective view showing a part of the sub unit SUT of the third embodiment. In the present embodiment, the sub unit SUT has an additional heat storage member 140 in addition to the structure of the first embodiment. The heat storage member 140 is disposed on the side opposite to the fastening member 90 with respect to the terminal 13 of the electronic component 10. The heat storage member 140 is made of metal (for example, made of copper, copper alloy, aluminum, or aluminum alloy). The heat storage member 140 can also be referred to as a "metal member". The heat storage member 140 has a block 141 and a hole 142.

[0223] Figure 21 is a cross-sectional view showing the sub unit SUT of the third embodiment. The block 141 is a metal member having a cuboid shape. The height H41 of the block 141 in the Z direction is, for example, greater than half of the length LI of the shaft portion 91 of the fastening member 90 in the Z direction. The height H41 of the block 141 in the Z direction is, for example, greater than the length LI of the shaft portion 91 of the fastening member 90 in the Z direction.

[0224] The hole 142 is provided in the block 141. The hole 142 is a cylindrical hole extending in the Z direction. The hole 142 is open in the +Z direction. The diameter of the hole 142 is greater than the engaging member 44 and the washer 45. By providing the hole 142, the block 141 has a bottom portion 141a and a peripheral wall portion 141b.

[0225] The bottom portion 141a is a plate portion in the horizontal direction. The bottom portion 141a faces the terminal 13 of the electronic component 10 in the Z direction. For example, the bottom portion 141a is placed on the terminal 13 of the electronic component 10 from the +Z direction side. The bottom portion 141a has a mounting hole 140h facing the mounting hole 13h of the terminal 13 of the electronic component 10.

[0226] The inner peripheral surface of the mounting hole 140h does not have a screw groove, for example. The mounting hole 140h is a through hole passing through the bottom portion 141a in the Z direction. However, the mounting hole 140h can also be a hole having a screw groove and engaging with the shaft portion 91 of the fastening member 90. In addition, the mounting hole 140h can also be a bottomed hole open in the -Z direction. The peripheral wall portion 141b stands up from the bottom portion 141a in the +Z direction. The peripheral wall portion 141b surrounds the periphery of the hole 142. The peripheral wall portion 141b extends to the +Z direction side beyond the end portion of the shaft portion 91 of the fastening member 90 on the +Z direction side, for example.

[0227] In the present embodiment, the shaft portion 91 of the fastening member 90 is inserted into the mounting holes 42h, 13h, 140h in a state where the mounting hole 42h of the bus bar 42, the mounting hole 13h of the electronic component 10, and the mounting hole 140h of the heat accumulating member 140 overlap in the Z direction. The tip portion of the shaft portion 91 that passes through the mounting holes 42h, 13h, 140h passes through the washer 45 and is engaged with the engaging member 44. With this structure, the bus bar 42, the terminal 13 of the electronic component 10, and the heat accumulating member 140 are fixed integrally.

[0228] According to such a structure, by providing the additional heat accumulating member 140, further improvement of the thermal characteristics of the electric connection unit 1 can be achieved.

[0229] (Fourth Embodiment)

[0230] Next, the fourth embodiment will be described. The fourth embodiment differs from the first embodiment in that a fastening member 90 that fastens the electronic component 10 and the connection member 20 is provided. In addition, the structures described below are the same as those of the first embodiment.

[0231] Figure 22 is a cross-sectional view that shows a subunit SUS of the fourth embodiment. In the present embodiment, the electric connection unit 1 has a fastening member 90 instead of the fastening member 71 described above. The shaft portion 91 of the fastening member 90 is inserted into the mounting hole 13h of the electronic component 10S and the mounting hole 21h of the connection member 20 in a state where the mounting hole 13h of the electronic component 10S and the mounting hole 21h of the connection member 20 overlap. In the present embodiment, the shaft portion 91 of the fastening member 90 engages with the mounting hole 13h of the electronic component 10S. Thereby, the electronic component 10S and the connection member 20 are fixed.

[0232] According to such a structure, by providing the fastening member 90 that fastens the electronic component 10S and the connection member 20, an increase in the number of components of the electric connection unit 1 can be suppressed, and further improvement of the thermal characteristics of the electric connection unit 1 can be achieved.

[0233] The above describes several embodiments and modified examples. However, the embodiments and modified examples are not limited to the examples described above. For example, the above-described multiple embodiments and modified examples can be combined with each other to be implemented.

[0234] Explanation of Reference Numerals

[0235] 1… electric connection unit

[0236] SU, SUS, SUT… subunit

[0237] 10, 10S, 10T, 10TA, 10TB… electronic component

[0238] 13, 13A, 13B... terminal

[0239] 13h... mounting hole

[0240] 20... connecting member

[0241] 40S... wiring substrate

[0242] 40T... wiring structure

[0243] 41S... base plate

[0244] 41T... base member

[0245] 42... bus bar

[0246] 42h... mounting hole

[0247] 90... fastening member

[0248] 90a... first portion

[0249] 90b... second portion

[0250] 91... shaft portion

[0251] 92... base portion

[0252] 93... heat accumulating portion

[0253] 110... metal plate (heat radiating member)

[0254] 120... heat conducting member

[0255] 130... connecting member

[0256] 133h... mounting hole

Claims

1. A fastening component, characterized in that, Used for electrical connection units, and having: A shaft portion is inserted into the first mounting hole and the second mounting hole of the first component in a state where the first mounting hole of the first component and the second mounting hole of the second component overlap in a first direction, and the shaft portion has threaded teeth; The base, when the direction intersecting the first direction is set as the second direction, has a width in the second direction that is greater than the width of the shaft portion, and faces the first component or the second component in the first direction; as well as A heat storage section is disposed on the side opposite to the shaft portion relative to the base portion and is integrally formed with the base portion.

2. The fastening component according to claim 1, characterized in that, The width of the heat storage section in the second direction is greater than the width of the base in the second direction.

3. The fastening component according to claim 2, characterized in that, The thickness of the heat storage portion in the first direction is greater than the thickness of the base portion in the first direction.

4. The fastening component according to claim 2, characterized in that, When viewed from the first direction, the heat storage part has a shape that is different from that of a circle and a regular polygon.

5. An electrical connection unit, characterized in that, have: At least one of the first component and the second component; and The fastening component as described in claim 1 or 2.

6. The electrical connection unit according to claim 5, characterized in that, It also has an insulating base component. The width of the heat storage portion in the second direction is greater than the width of the base portion in the second direction. The base component has a retaining portion located between the first component and the heat storage portion in the first direction, and facing the heat storage portion in the first direction to retain the heat storage portion.

7. The electrical connection unit according to claim 5, characterized in that, It also has: A heat dissipation component, the heat dissipation component facing the heat storage section from a side opposite to the first component and the second component; and A heat-conducting component is disposed between the heat storage part and the heat dissipation component.

8. A fastening component, characterized in that, Used for electrical connection units, and having: The first part is inserted into the first mounting hole and the second mounting hole of the first component in a state where the first mounting hole of the first component and the second mounting hole of the second component overlap in a first direction. The first part has threads and engages with a nut. as well as The second part, in which the direction intersecting the first direction is set as the second direction, has a width in the second direction that is greater than the width in the second direction of the first part, the second part faces the first component or the second component in the first direction, and has a volume that is more than twice that of the nut.

9. An electrical connection unit, characterized in that, have: At least one of the first component and the second component; and The fastening component as described in claim 8.

10. An electrical connection unit, characterized in that, have: A fastening component, comprising: a first portion, wherein the first portion is inserted into the first mounting hole and the second mounting hole of the first component in a state where the first mounting hole and the second mounting hole of the second component overlap in a first direction, and has threads; and a second portion, wherein, when the direction intersecting the first direction is set as the second direction, the width of the second portion in the second direction is greater than the width of the first portion in the second direction, and the second portion faces the first component or the second component in the first direction. A heat dissipation component, the heat dissipation component facing the second portion from a side opposite to the first component and the second component; and A heat-conducting component is disposed between the second part and the heat dissipation component.

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