Method for manufacturing electronic component, electronic component, and bus bar

Abstract

An electronic component (100) includes: a main body portion including an electronic component; a bus bar (120) electrically connected to the electronic component; and a cover section (130) that covers a part of the outer surface of the bus bar (120). A method for manufacturing an electronic component (100) includes a molding step. In the molding step, a pressing member having a pressing surface having unevenness is also used. In the molding step, the pressing member covers the other portion of the outer surface such that the pressing surface is pressed against the other portion, the cover material is disposed around the pressing member to mold the cover portion, and the pressing surface is pressed against the other portion to transfer irregularities to the other portion to form the irregularities structure (123).

Description

TECHNICAL FIELD

[0001] The present application relates to a manufacturing method of an electronic component, an electronic component manufactured by the manufacturing method, and a bus bar. BACKGROUND

[0002] A part of the bus bar for wiring is embedded with a resin. In relation to such a technique, a bus bar insert member (10) having a synthetic resin-made main body (12) and a bus bar (14) is disclosed in Patent Literature 1 below. The bus bar (14) includes a connection portion (18) connected to other components and protruding to the outside of the main body (12), and a buried portion (16) buried in the synthetic resin-made main body (12). The synthetic resin-made main body (12) of the bus bar insert member (10) in Patent Literature 1 is formed by insert molding.

[0003] On the other hand, in the bus bar, a concave-convex structure is formed on a contact surface that comes into contact with other components (hereinafter also referred to as connection target components) electrically connected to the bus bar. The concave-convex structure is sometimes formed by laser irradiation or press working, or the like.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2019-215997 SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] A bus bar having a concave-convex structure on a contact surface and a part of which is embedded in a synthetic resin or the like cover material is generally manufactured by sequentially going through a process of forming a concave-convex structure on the contact surface and a molding process of covering a part of the bus bar with the cover material. However, since a plurality of processes are involved, there is a problem that the manufacturing process becomes complicated.

[0009] The present application was made in view of the above-described problems, and provides a manufacturing method of an electronic component that is easy to manufacture, an electronic component, and a bus bar.

[0010] MEANS FOR SOLVING THE PROBLEMS

[0011] The present application is a manufacturing method of an electronic component including a main body portion including an electronic element, a bus bar electrically connected to the electronic element, and a cover portion covering a part of an outer surface of the bus bar, wherein the manufacturing method includes a molding step of molding the cover portion by disposing a cover material at the part, in the molding step, a pressing member having a pressing surface having a concave-convex is used, the pressing member covers another part of the outer surface in a manner that the pressing surface is pressed against the other part, the cover portion is molded by disposing the cover material around the pressing member, and the concave-convex is transferred to the other part by the pressing surface being pressed against the other part to form a concave-convex structure.

[0012] Further, the present application is an electronic component including a main body portion including an electronic element, a bus bar electrically connected to the electronic element, and a cover portion covering a part of an outer surface of the bus bar, characterized in that, in the outer surface, a concave-convex region having a concave-convex structure is formed in a contact portion exposed from the cover portion.

[0013] The present application is a bus bar characterized in that a part of an outer surface of the bus bar is covered by a cover portion, and a concave-convex structure is formed in another part of the outer surface.

[0014] A pressing member is pressed against the bus bar and covers a desired range of the outer surface of the bus bar. Thereby, it is possible to form a concave-convex structure in the range by pressing of the pressing member while the cover material is masked from the range and is molded into a desired shape.

[0015] Effects of the Invention

[0016] According to the manufacturing method of the electronic component of the present application, it is possible to perform the molding step and the transfer step at the same time. Thereby, the manufacturing process is reduced, and it is possible to make the manufacturing of the electronic component easy. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above objects and other objects, features and advantages of the present application will be more clearly understood from the following preferred embodiments thereof, and the appended drawings.

[0018] Figure 1 (a) of FIG. 1 is a perspective view showing an example of an electronic component of a first embodiment of the present application. Figure 1 (b) of FIG. 1 is a front view of a first bus bar in the electronic component of the first embodiment.

[0019] Figure 2 is a sectional view taken along the arrow line II-II of the electronic component of the first embodiment. Figure 1 (b) of FIG. 1 is a sectional view taken along the single-dot chain line of the section of (a) of FIG. 1.

[0020] Figure 3 (a) is the electronic component of the first embodiment. Figure 2 An enlarged sectional view of region X1 in (b). Figure 3 (b) is the electronic component of the first embodiment. Figure 2 An enlarged sectional view of region X2 in (b).

[0021] Figure 4 This is a cross-sectional view of the electronic components in the first embodiment when the second busbar is installed.

[0022] Figure 5 (a) is the electronic component of the first embodiment. Figure 4 An enlarged sectional view of region Y1 in the diagram. Figure 5 (b) is the electronic component of the first embodiment. Figure 4 An enlarged sectional view of region Y2 in the diagram.

[0023] Figure 6 This is a schematic cross-sectional view used to illustrate the manufacturing process of the electronic component according to the first embodiment.

[0024] Figure 7 This is a schematic cross-sectional view used to illustrate the manufacturing process of the electronic component of the first embodiment, and it is a diagram showing the state in which the pressing component is pressed against the first busbar. Detailed Implementation

[0025] The various constituent elements of the electronic components and busbars of the present invention do not need to exist independently. Multiple constituent elements are allowed to form a component, a constituent element is formed by multiple components, a constituent element is part of other constituent elements, a part of a constituent element is repeated by a part of other constituent elements, etc.

[0026] Furthermore, the manufacturing method of the electronic component of the present invention is sometimes described using multiple steps described sequentially, but the order of description does not limit the order or timing of performing the multiple steps. Therefore, when implementing the manufacturing method of the electronic component of the present invention, the order of the multiple steps can be changed without affecting the content, and some or all of the timing of performing the multiple steps can also be repeated.

[0027] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in the drawings, corresponding constituent elements are labeled with common reference numerals, and repetitive descriptions are omitted where appropriate.

[0028] Furthermore, in this embodiment, the x-direction, y-direction, and z-direction are specified for explanation as shown in the figure. However, this is a convenient specification for simply illustrating the relative relationships of the constituent elements and does not limit the direction during manufacturing or use of the product implementing the present invention.

[0029] Further, the planar surface in the present application means a shape physically formed as a target of the planar surface, and does not necessarily need to be a geometrically perfect planar surface.

[0030] <First Embodiment>

[0031] (Summary of Electronic Component)

[0032] Figure 1 is a schematic view showing an example of an electronic component 100 of the first embodiment of the present application.

[0033] First, a summary of the electronic component 100 of the present embodiment will be described.

[0034] The electronic component 100 includes a main body portion 110, a first bus bar 120, and a cover portion 130. The main body portion 110 includes an electronic element 111. The first bus bar 120 is electrically connected to the electronic element 111. The cover portion 130 covers a part of an outer surface of the first bus bar 120. The contact portion 122 is provided with a concave-convex region 122a having a concave-convex structure 123. The contact portion 122 is a part on the outer surface exposed from the cover portion 130.

[0035] The electronic component 100 has a shape that can be manufactured by the manufacturing method described later.

[0036] Next, the electronic component 100 of the present embodiment will be described in detail.

[0037] The electronic component 100 refers to a part including the electronic element 111 constituting an electronic circuit. In particular, a constituent element capable of being connected to or detached from a contact target component is referred to as the electronic component 100. The electronic element 111 is a constituent element included in the electronic component 100, and is a part constituting an electronic circuit including a core or a coil. The main function of the electronic component 100 is implemented by the electronic element 111. The electronic element 111 includes a core or a coil, and the entire electronic component 100 can be a coil component such as an inverter, an inductor, a transformer, or an antenna. The electronic component 100 in the present embodiment is a vehicle-mounted electronic component constituting an electrical device mounted on a vehicle body of an automobile or the like. More specifically, a battery device such as a lithium ion battery or an all-solid-state battery mounted on an electric vehicle is exemplified as the electrical device. As the electronic component 100, various reactors to which a current is applied at the time of charging or discharging in connection with the electrical device as the vehicle-mounted battery device are exemplified.

[0038] The main body portion 110 is a portion of the electronic component 100, and is a portion that contains the electronic element 111. The main body portion 110 preferably has the electronic element 111 inside. The entire main body portion 110 can also be covered with a molded resin or the like. In the present embodiment, the main body portion 110 is a component shaped such that the x-axis direction is the length direction, but the main body portion 110 can have any shape.

[0039] The bus bar is composed of a material having electrical conductivity, such as a metal including copper. In addition, it is preferable that the bus bar be a bus bar in which the area in the cross section (cross section when cut perpendicularly to the direction of current flow) is larger than that of a wire, and the overall shape is substantially rod-shaped or plate-shaped. In the present embodiment, the electronic component 100 or the electrical device 1 described later has a first bus bar 120 or a second bus bar 200 as the bus bar. Hereinafter, the direction having the largest dimension of the bus bar among the height direction, width direction, or thickness direction of the bus bar will be referred to as the length direction of the bus bar. In the present embodiment, the length direction of the first bus bar 120 is the z-axis direction, and the length direction of the second bus bar 200 (see FIG. 2) is the y-axis direction. The shape of the cross section of the bus bar can be a polygon such as a rectangle, or can be a circle or an ellipse. Figure 4 ) of the bus bar. The shape of the cross section of the bus bar can be a polygon such as a rectangle, or can be a circle or an ellipse.

[0040] The first bus bar 120 is a component for electrically connecting a contact target component connected to the electronic component 100 and the electronic element 111. In the present embodiment, a portion of the first bus bar 120 on the base end side (-z direction) is buried inside the main body portion 110, and another portion on the front end side (z direction) protrudes outside the main body portion 110. The first bus bar 120 in the present embodiment is a plate-shaped conductive component having main surfaces in the direction of the through hole 121 described later. In the present embodiment, the first bus bar 120 is electrically connected to the electronic element 111 inside the main body portion 110.

[0041] In the present embodiment, the electronic component 100 has one first bus bar 120, but the electronic component 100 can have a plurality of bus bars 120.

[0042] The cover portion 130 is formed of an insulating material such as resin (hereinafter, also referred to as a cover material), and is a member that covers a portion of the first bus bar 120. The insulating property or water resistance of the first bus bar 120 or the electronic component 100 can be improved by the cover portion 130. The cover portion 130 covers at least the outer surface of the first bus bar 120 at the adjacent portion 124 described later. The cover portion 130 is not limited to covering the adjacent portion 124, and can cover another portion of the outer surface of the first bus bar 120. For example, in the present embodiment, the cover portion 130 covers a portion of the end surface of the first bus bar 120 and a portion of the back surface 127 described later in addition to the adjacent portion 124. The cover portion 130 is preferably in close contact with the portion of the outer surface of the first bus bar 120 covered by the cover portion 130, but the cover portion 130 and the portion can be separated from each other. In the first bus bar 120, the contact portion 122 and a portion of the proximal end side described later are not covered by the cover portion 130 and are exposed from the cover portion 130. The portion of the proximal end side of the first bus bar 120 can also be covered by the cover portion 130.

[0043] The contact portion 122 is a portion of the outer surface of the first bus bar 120 as described above, and is exposed to the outside of the cover portion 130. The contact portion 122 refers to a portion of the surface area that contacts a contact target component (in the present embodiment, the second bus bar 200 described later (see FIG. 2)) or a portion of the surface area that is intended to contact the contact target component. The contact portion 122 can be composed only of the surface area that contacts or is intended to contact the contact target component, or can include a surface area around the surface area that does not contact or is not intended to contact the contact target component. In the present embodiment, the second bus bar 200 (particularly, the opposing surface 210 (see FIG. 2)) contacts substantially the entire region of the contact portion 122, but a portion of the outer edge side of the contact portion 122 does not contact the second bus bar 200. Figure 4 Figure 4

[0044] The concave-convex region 122a is a portion of the contact portion 122, and refers to a surface region in which the concave-convex structure 123 is formed. In other words, the concave-convex region 122a is a region in which the concave-convex ratio is larger than that of another region (for example, the outer peripheral portion 122b) adjacent to the outside of the concave-convex region 122a. The concave-convex region 122a is a planar region extending in the substantially extending direction of the contact portion 122.

[0045] ​​The uneven region 122a is a portion of a surface (facing the y-direction) on the outer surface of the first busbar 120 that has a contact portion 122. Preferably, the uneven region 122a is formed on a portion of this surface that overlaps with the second busbar 200 when viewed along the overlap direction (axial direction of the shaft member 140 described later) when engaged with the second busbar 200. That is, the outer edge of the uneven region 122a is preferably positioned at the center of the overlap between the second busbar 200 and the first busbar 120 when viewed from the overlap direction (axial direction of the shaft member 140 described later) when the second busbar 200 and the first busbar 120 are engaged.

[0046] The concave-convex structure 123 is a structure having multiple concave or convex portions. As described above, the concave-convex region 122a has the concave-convex structure 123 as a whole, thereby becoming a rough surface with a surface roughness greater than that of the surrounding region of the concave-convex region (such as the outer peripheral portion 122b described later).

[0047] Here, the recess in the concave-convex structure 123 refers to the portion protruding from the inner side of the first busbar 120 disposed in the concave-convex region 122a, and the convex portion (also referred to as the protrusion 123e described later) in the concave-convex region 122a refers to the portion protruding from the outer side of the first busbar 120 disposed in the concave-convex region 122a. Here, the direction from the outer surface of the first busbar toward the center is referred to as the protruding inner side, and the direction from the center of the first busbar toward the outer surface is referred to as the protruding outer side.

[0048] like Figure 1 As shown in (b), the uneven structure 123 in this embodiment is formed by two or more bottomed grooves 123a that run parallel to each other. The grooves 123a are formed by a bottom (groove bottom 123a1 (refer to...)). Figure 2 (b))) and clamping the bottom of the groove 123a1 (refer to) Figure 2 (b)) A pair of wall portions (groove wall portion 123a2 (refer to) Figure 2 The grooves 123a are divided into (b) sections. Here, "grooves 123a along each other" means that the extension directions of each groove 123a have the same directional component, and preferably the grooves 123a are approximately parallel to each other. The extension direction of the grooves 123a can be straight as in this embodiment, or it can be wavy. Alternatively, the shape of the multiple grooves 123a can also be concentric circles with different radii. That is, the extension direction of the grooves 123a can also be circular. When the shape of the grooves 123a is wavy or circular, it is also preferable that adjacent grooves 123a are along each other.

[0049] In this embodiment, such as Figure 1As shown in (b), a plurality of generally straight grooves 123a extend in a direction perpendicular to the length direction of the first busbar 120 (x-axis direction) and are continuously arranged in this length direction (z-axis direction). Figure 4 As shown, in this embodiment, a portion of the first busbar 120 and the second busbar 200 overlaps and contacts each other in the y-axis direction, and are arranged along the length direction (z-axis direction) of the first busbar 120. By arranging a plurality of grooves 123a continuously in a predetermined direction, lateral displacement of the contact surfaces of the first busbar 120 and the second busbar 200 in that predetermined direction can be suppressed. Alternatively, in this embodiment, the grooves 123a may extend along the length direction of the first busbar 120, and a plurality of grooves 123a may be arranged in a direction perpendicular to that length direction.

[0050] In addition, Figure 1 of (a), Figure 1 (b) Figure 2 , Figure 4 as well as Figure 6 In the middle, for convenience, and Figure 3 of (a), Figure 3 (b) Figure 5 (a) and Figure 5 Compared to the groove 123a in (b), the widths of the bottom 123a1 and top 123b of the groove and the inclination angle of the groove wall 123a2 have been changed.

[0051] In this embodiment, the concave-convex structure 123 is composed of a plurality of grooves 123a, but it can also be replaced by a plurality of dispersed protrusions.

[0052] Furthermore, in this embodiment, a portion of the surface area (including adjacent portions 124) covered by the cover portion 130 on the outer surface of the first busbar 120 is a non-formed area of ​​the uneven structure 123. That is, this portion of the surface area is planar.

[0053] like Figure 5 As shown in (a), the uneven structure 123 in this embodiment can also be described as having multiple protrusions 123e, as will be described later. Each protrusion 123e is a portion of the first busbar 120 that protrudes from the inner protrusion side toward the outer protrusion side. In this embodiment, the protrusion 123e is a portion of the first busbar 120 sandwiched between a groove 123a and another groove 123a adjacent to the first groove 123a. More specifically, the protrusion 123e is a portion of the first busbar 120 divided by the groove wall portion 123a2 that divides the groove 123a and the top 123b. In this embodiment, the protrusion 123e extends in a generally straight extending direction along the groove 123a.

[0054] The width of the protrusion 123e preferably decreases towards the protruding direction of the convex-concave structure 123. Furthermore, the protruding dimension of the protrusion 123e is preferably larger than the width dimension of the protrusion 123e (particularly the width dimension of the base end of the protrusion 123e). Therefore, in the joining process described later, the protrusion 123e can be easily embedded into the second busbar 200. Hereinafter, the protruding direction of the convex-concave structure 123 will sometimes be simply referred to as the protruding direction. The width direction of the protrusion 123e refers to any direction perpendicular to the protruding direction and is the direction in which the size of the protrusion 123e is smallest. The width dimension of the protrusion 123e refers to the dimension of the protrusion 123e in this width direction. In this embodiment, the width dimension of the protrusion 123e formed by a plurality of mutually adjacent grooves 123a in the convex-concave structure 123 refers to the dimension of the protrusion 123e in the direction in which the plurality of grooves 123a are arranged.

[0055] like Figure 3 (a) and Figure 3 As shown in (b), in this embodiment, the top 123b, which serves as the protruding front end in the concave-convex structure 123, is flat. In other words, the top 123b has a width of a predetermined size.

[0056] The top 123b refers to the portion disposed on the protruding outer side of the first busbar 120 in the convex-concave structure 123. In this embodiment, the area sandwiched between multiple grooves 123a is the top 123b, which extends in a direction substantially the same as the direction in which the grooves 123a extend (z-axis direction). The top 123b has a width of a predetermined dimension in the direction in which the grooves 123a are arranged (x-axis direction). When the convex-concave structure 123 is composed of scattered protrusions, the protruding ends of these protrusions are the top 123b.

[0057] Here, "flat" means planar, or the radius of curvature of the top 123b at the point where the protrusion is positioned closest to its outermost protrusion is greater than half the width of the protrusion (especially the width of the front end). That is, the top 123b can also be a curved surface that gently curves towards the outside or inside of the first busbar 120. Preferably, the radius of curvature of the top 123b is greater than the width of the protrusion. More preferably, the top 123b is planar.

[0058] Instead of the present embodiment, the shape of the top 123b can be a shape that is tapered toward the outside of the first bus bar 120. That is, the radius of curvature of the top 123b at the point of the protruding portion arranged most to the outside of the protruding portion can also be smaller than one-half of the width dimension of the protruding portion, particularly the width dimension of the protruding tip portion. By the top 123b being sharp, the top 123b easily embeds into the second bus bar 200 at the time of press bonding the first bus bar 120 and the second bus bar 200.

[0059] By the top 123b being flat, the top 123b comes into surface contact with the second bus bar 200 before the top 123b embeds into the second bus bar 200 in the joining process described later. Thus, the top 123b does not slip on the second bus bar 200. As a result, the first bus bar 120 and the second bus bar 200 can be continuously press bonded in the desired positional relationship. In addition, the top 123b is concentratedly press bonded to a prescribed portion on the surface of the second bus bar 200, and thus easily embeds into the prescribed portion.

[0060] In addition, in the case where the pitch of the grooves 123a is made constant, by the top 123b having a width, the inclination angle of the wall portion (groove wall portion 123a2 described later) that divides the grooves 123a with respect to the outer peripheral portion 122b can be increased compared to the case where the top 123b is substantially free of a width and is sharp. Thus, in the joining process described later, the oxidation film covering the groove wall portion 123a2 easily peels off.

[0061] In the present embodiment, the width of the top 123b sandwiched by the two grooves 123a is larger than the width of the bottom of the groove 123a (groove bottom 123al). In the present embodiment, the top 123b has a width of a prescribed dimension in the direction (x-axis direction) in which the grooves 123a are arranged. In addition, in the present embodiment, the groove bottom 123al has a width of a prescribed dimension in the direction (x-axis direction) in which the grooves 123a are arranged, but is not limited thereto. It can also be that the groove bottom 123al is substantially linear, and the width of the groove bottom 123al is substantially zero. In this case, the width of the top 123b is also larger than the width of the groove bottom 123al.

[0062] In this way, by making the width of the top 123b larger than the width of the groove bottom 123al, the width of the top 123b can be sufficiently ensured. Thus, as described above, the displacement of the first bus bar 120 and the second bus bar 200 in the joining process can be sufficiently prevented.

[0063] Furthermore, in the joining process described later, a portion of the second busbar 200 is pushed out to other locations by the insertion of the top 123b into the second busbar 200. By forming the groove 123a deeper until the width of the bottom 123a1 of the groove becomes sufficiently small, this portion of the second busbar 200 can enter the bottom side of the groove 123a without pushing the top 123b back. As a result, it is easy to maintain the state of the top 123b embedded in the second busbar 200. In addition, by the portion of the second busbar 200 entering the bottom side of the groove 123a, the contact area between the second busbar 200 and the first busbar 120 increases, thereby reducing the contact resistance.

[0064] Alternatively, the width of the top 123b can be the same as or smaller than the width of the bottom 123a1 of the groove, instead of this embodiment.

[0065] Furthermore, it is preferable that the width of the top 123b is smaller than the width of the groove 123a at the opening of the groove 123a. By making the width of the top 123b sufficiently small, the top 123b can be easily embedded into the second busbar 200 during the joining process described later.

[0066] In this embodiment, the first busbar 120 has a through hole 121 that opens at the contact portion 122. The through hole 121 is located on the back side 127 (see reference 127) opposite to the contact portion 122 in the inward direction of the first busbar 120. Figure 1 (a) is also open. That is, the through-hole 121 in this embodiment has the same through-direction as the thickness direction of the first busbar 120. In addition, the through-hole 121 also has the same through-hole axis as the shaft member 140 described later. The through-hole 121 is divided by the peripheral wall surface 121b, which is also part of the outer surface of the first busbar 120. The through-hole 121 preferably has the through-direction perpendicular to the length direction (z-axis direction) of the first busbar 120. Specifically, as Figure 4 As shown, the through-hole 121 is preferably in the same direction (y-axis direction) as the first busbar 120 and the contact target component (second busbar 200) that contacts the first busbar 120.

[0067] In this embodiment, the through hole 121 is circular in shape when viewed from the through direction, but is not limited to this. The shape can be a rectangle or other polygons, or it can be an ellipse other than a circle.

[0068] Electronic component 100 has a shaft component 140 that is inserted through a through hole 121. The shaft component 140 is a long strip having a shaft portion 142 that is inserted through a through hole 121 in the first busbar 120 and a hole provided in the second busbar 200. For example... Figure 4As shown, in the present embodiment, the shaft member 140 is a bolt. In the electrical apparatus 1 described later, the engagement of the first bus bar 120 and the second bus bar 200 is maintained by the shaft member 140. One end portion (end portion on the side of the shaft head portion 141 described later) of the shaft member 140 is disposed in the through-hole 121, and the shaft member 140 is erected in the through-hole 121. Here, the shaft member 140 being erected in the through-hole 121 means that the shaft member 140 is inserted through the through-hole 121 and the extending direction (axial direction) of the shaft member 140 is a direction intersecting the contact portion 122. It is preferable that the extending direction of the shaft member 140 be a perpendicular direction perpendicular to the contact portion 122.

[0069] When viewed in the axial direction of the shaft member 140, the concave-convex region 122a is disposed around the shaft member 140. When viewed in the axial direction of the shaft member 140, the concave-convex region 122a being disposed around the shaft member 140 means that a portion of the contact portion 122 near the shaft member 140 (the through-hole 121) is formed with the concave-convex region 122a. That is, it means that the shortest distance (the distance from the peripheral wall surface of the through-hole 121 to the peripheral edge of the concave-convex region 122a viewed in the axial direction of the shaft member 140) of the contact portion 122 on which the shaft member 140 and the concave-convex region 122a are in contact is small. This shortest distance coincides with the width of the inner peripheral portion 122c described later. More specifically, it is preferable that this shortest distance be smaller than the protruding dimension of the shaft head portion 141 described later. Here, the protruding dimension of the shaft head portion 141 means the height of the outer peripheral edge of the shaft head portion 141 from the peripheral surface of the shaft portion 142. Alternatively, it is preferable that this shortest distance be smaller than the radius of the through-hole 121. It is further preferable that this shortest distance be zero. By thus disposing the concave-convex region 122a around the shaft member 140, the shaft member 140 (particularly, the shaft head portion 141) can sufficiently apply stress for embedding the concave-convex structure 123 described later into a contact target member (the second bus bar 200 or the like).

[0070] In the present embodiment, the concave-convex region 122a is formed in a manner that surrounds the periphery of the shaft member 140 when viewed in the axial direction of the shaft member 140. In other words, the concave-convex region 122a is formed outside the entire orientation in the radial direction of the shaft member 140. Here, the radial direction of the shaft member 140 is a direction from the axial center of the shaft member 140 toward the peripheral surface of the shaft member 140. Instead of the present embodiment, the concave-convex region 122a can be formed outside a portion in the radial direction of the shaft member 140.

[0071] As Figure 1As shown in (b), the contact portion 122 includes an inner peripheral portion 122c, which is located on the side closer to the shaft member 140 than the uneven region 122a. The inner peripheral portion 122c is a portion of the surface area of ​​the contact portion 122. In this embodiment, where the contact portion 122 is arranged to surround the shaft member 140 when viewed along the axial direction of the shaft member 140, the inner peripheral portion 122c occupies the surface area on the side closer to the shaft member 140 than the inner peripheral edge of the uneven region 122a when viewed along the axial direction of the shaft member 140. In other words, in this embodiment, the inner peripheral portion 122c is arranged to surround the shaft member 140 when viewed along the axial direction of the shaft member 140, and the uneven region 122a is arranged to surround the inner peripheral portion 122c. More specifically, the contact portion 122c is located on the side closer to the shaft member 140 than the side closer to the shaft member 140 when viewed along the axial direction of the shaft member 140. Figure 1 The area between the inner periphery of the uneven region 122a shown in (b), i.e., the double-dotted line IV and the peripheral wall surface 121b, is the inner peripheral portion 122c. Alternatively, in the case where the uneven region 122a is formed only in a portion of the radial direction of the shaft member 140 and not in the other portion, the area between the peripheral wall surface 121b of the through hole 121 and the uneven region 122a when viewed axially along the shaft member 140 is the inner peripheral portion 122c.

[0072] like Figure 3 As shown in (a), the inner peripheral portion 122c is flat. Flatness of the inner peripheral portion 122c means that no uneven structure 123 is formed therein. Flatness of the inner peripheral portion 122c includes the inner peripheral portion 122c being a curved surface that bulges outward toward the protruding outer side of the first busbar 120 or is recessed toward the protruding inner side. Preferably, the inner peripheral portion 122c is planar.

[0073] Because the inner circumference 122c is flat, during the joining process described later, the inner circumference 122c abuts against the opposing surface 210 of the second busbar 200, enabling the positional relationship between the first busbar 120 and the second busbar 200 to be aligned. Specifically, at the beginning or during the pressing of the second busbar 200 and the first busbar 120, the inner circumference 122c contacts the opposing surface 210, and the contact portion 122 of the first busbar 120 is arranged parallel to the opposing surface 210 of the second busbar 200.

[0074] In this embodiment, as described later, the first busbar 120 bulges and bends in the protruding direction of the concave-convex structure 123. More specifically, the portion closest to the shaft member 140 bulges most in this protruding direction. Therefore, the surface of the protruding end 123b connecting the protrusion 123e, i.e., the imaginary surface II described later, is... Figure 3 (a) and Figure 3of the concavo-convex structure 123. Specifically, a portion of the imaginary surface II on the side close to the shaft member 140 is bulged toward the protruding direction the most. That is, in Figure 3 of (a) and Figure 3 of (b), the imaginary surface II is upwardly inclined from the lower left to the upper right in the drawing. In Figure 3 of (a) and Figure 3 of (b), the imaginary surfaces I and II illustrated in (a) and (b), respectively, are mutually connected surfaces.

[0075] In addition, in Figure 2 , the illustration of the curved shape of the first bus bar 120 is omitted and the first bus bar 120 is illustrated as a flat shape.

[0076] The curved shape of the first bus bar 120 (the curved shape of the imaginary surface II) can be formed by being cut or being applied with stress or the like at the time of forming the outer shape of the first bus bar 120. Alternatively, the shape can be formed by press-fitting the shaft member 140 in the through-hole 121.

[0077] The contact portion 122 includes an outer peripheral portion 122b disposed around the concavo-convex region 122a.

[0078] The outer peripheral portion 122b is a partial surface region of the contact portion 122 adjacent to the concavo-convex region 122a, and is a region in which the concavo-convex structure 123 is not formed. That is, the outer peripheral portion 122b is a region in which the surface is formed flatly compared to the concavo-convex region 122a. In addition, the outer peripheral portion 122b is a region on the outer side compared to the concavo-convex region 122a when viewed in the radial direction of the shaft member 140. For example, a partial surface region having a prescribed width along a portion of the outer edge of the concavo-convex region 122a is the outer peripheral portion 122b. In the present embodiment in which the concavo-convex region 122a is formed in a manner surrounding the periphery of the shaft member 140 when viewed in the axial direction of the shaft member 140, the outer peripheral portion 122b is a region formed in a manner surrounding the periphery of the concavo-convex region 122a when viewed in the axial direction and having a prescribed width in the radial direction of the shaft member 140. That is, the outer peripheral portion 122b is a region in which the surface is formed flatly compared to the concavo-convex region 122a when viewed in the axial direction of the shaft member 140. Figure 1 The region sandwiched by the outer edge of the concavo-convex region 122a and the side end surface of the cover portion 130 illustrated by the double-dot chain line III in (b) is the outer peripheral portion 122b. In the case where the concavo-convex region 122a is formed only in a portion of the radial direction of the shaft member 140 instead of the present embodiment, the region formed on the outer side of the concavo-convex region 122a in the portion of the radial direction of the shaft member 140 is the outer peripheral portion 122b.

[0079] In the present embodiment, the inner peripheral portion 122c protrudes more than the outer peripheral portion 122b in the protruding direction of the concave-convex structure 123. The protruding direction of the concave-convex structure 123 is a direction from the height of the concave portion 123a (the height of the groove bottom 123al) in the concave-convex structure 123 toward the height of the top portion 123b with the concave portion as the starting point. This protruding direction coincides with a direction (y direction) from the contact portion 122 toward the outside of the first bus bar 120 in a direction perpendicular to the contact portion 122 (the concave-convex region 122a).

[0080] The inner peripheral portion 122c protrudes more than the outer peripheral portion 122b in the protruding direction of the concave-convex structure 123, whereby in the joining process described later, the inner peripheral portion 122c comes into abutment with the second bus bar 200 before the outer peripheral portion 122b. In addition, the inner peripheral portion 122c continues to be press-contacted to the second bus bar 200 until the outer peripheral portion 122b starts to be press-contacted to the second bus bar 200. By being stressed from the second bus bar 200 in this way, the inner peripheral portion 122c deforms. Specifically, a portion of the inner peripheral portion 122c is press-contacted to the shaft member 140 on the radially inner side of the shaft member 140 (the direction from the periphery of the shaft member 140 toward the center axis). Thereby, the press-contacting force of the shaft member 140 to the peripheral wall surface 121b of the through-hole 121 becomes large, and the shaft member 140 and the first bus bar 120 are more firmly fixed.

[0081] Instead of the present embodiment, the inner peripheral portion 122c and the outer peripheral portion 122b can be disposed at the same height in the protruding direction of the concave-convex structure 123. In other words, the inner peripheral portion 122c and the outer peripheral portion 122b can be disposed on the same plane. If configured in this way, in the joining process described later, when the first bus bar 120 is press-contacted to the second bus bar 200, the first bus bar 120 comes into contact with the second bus bar 200 at substantially the same time in both a portion of the contact portion 122 near the shaft member 140 and a portion of the periphery side of the contact portion 122. Thereby, the first bus bar 120 and the second bus bar 200 can be press-contacted to each other while the relative positions of the first bus bar 120 and the second bus bar 200 are aligned.

[0082] In addition, instead of the present embodiment, the outer peripheral portion 122b can protrude more than the inner peripheral portion 122c in the protruding direction of the concave-convex structure 123.

[0083] As Figure 3 (a) and Figure 3As described above, the concave-convex structure 123 has a plurality of protrusions 123e in (b). The protruding end 123b (also the top portion 123b) of the protrusion 123e protrudes more than the inner circumferential portion 122c in the protruding direction of the concave-convex structure 123. It is enough that the entire of one protrusion 123e protrudes more than the inner circumferential portion 122c in the protruding direction of the concave-convex structure 123. As described above, the virtual plane II is disposed so as to be inclined upward from the lower left toward the upper right in the drawing. Therefore, in the present embodiment, the protruding end 123b of the protrusion 123e (and the like) on the right side in the drawing in (a) protrudes more than the inner circumferential portion 122c in the protruding direction of the concave-convex structure 123. The other protrusions 123e can or can not protrude more than the inner circumferential portion 122c in the protruding direction. In other words, the inner circumferential portion 122c can or can not protrude more than the other protrusions 123e in the protruding direction. In the present embodiment, the inner circumferential portion 122c protrudes more than the protrusion 123e disposed near the outer circumferential portion 122b in the protruding direction of the concave-convex structure 123. Figure 3

[0084] Instead of the present embodiment, the protruding end 123b of all of the protrusions 123e in the concave-convex structure 123 can protrude more than the inner circumferential portion 122c in the protruding direction of the concave-convex structure 123.

[0085] In the present embodiment, the protruding end 123b of the protrusion 123e protrudes more than the outer circumferential portion 122b in the protruding direction of the concave-convex structure 123.

[0086] By the protruding end 123b of the protrusion 123e protruding more than the inner circumferential portion 122c in the protruding direction of the concave-convex structure, the protruding end 123b of the protrusion 123e comes into contact with the second bus bar 200 before the inner circumferential portion 122c in the joining process described later. Therefore, the protrusion 123e including the protruding end 123b easily enters the second bus bar 200 in the joining process.

[0087] ​Alternatively, in this embodiment, the inner peripheral portion 122c may protrude in the protruding direction of the concave-convex structure 123 than the protruding end 123b of the protruding portion 123e. In this case, the outer peripheral portion 122b may protrude in the protruding direction of the concave-convex structure 123 than the protruding end 123b of the protruding portion 123e, and the protruding end of the protruding portion 123e may also protrude in this protruding direction than the outer peripheral portion 122b. By having the inner peripheral portion 122c protrude in the protruding direction of the concave-convex structure 123 than the protruding end 123b of the protruding portion 123e, in the joining process described later, the inner peripheral portion 122c first abuts against the opposing surface of the second busbar 200. As a result, as described above, the inner peripheral portion 122c deforms due to the stress from the second busbar 200, and the pressing force between the shaft member 140 and the peripheral wall surface 121b of the through hole 121 increases, thereby more firmly fixing the shaft member 140 and the first busbar 120. Furthermore, during the joining process, the flat inner circumference 122c abuts against the opposing surface of the second busbar 200 before the protruding end 123b, thereby aligning the relative positions of the first busbar 120 and the second busbar 200 as described above. In the manufacturing method described later, by making the part provided on the pressing member 300 (see reference 1222c)... Figure 6 ) clearance hole 330 (refer to) Figure 6 The size and shape of the inner circumference 122c are larger than the size and shape of the cross-section of the shaft component 140, so that the inner circumference 122c protrudes in the protruding direction of the protrusion 123 than the protrusion 123e.

[0088] Alternatively, instead of this embodiment, the inner peripheral portion 122c and the protruding end 123b may be arranged at approximately the same height in the protruding direction of the concave-convex structure 123.

[0089] As described above, the concave-convex structure 123 has a bottomed recess 123a (groove 123a). For example... Figure 3 (a) and Figure 3 As shown in (b), the depth dimension of a portion of the recess 123a is greater than the depth dimension of another portion of the recess 123a disposed on the side (hereinafter also simply referred to as the outer peripheral side) near the periphery (outer peripheral edge) of the concave-convex region 122a. Here, the depth of the recess 123a refers to the depth dimension of the bottom of the recess (groove bottom 123a1) based on the imaginary surface II connecting the protruding ends 123b of the plurality of protrusions 123e. As described above, in this embodiment, as Figure 3 (a) and Figure 3 As shown in (b), the imaginary line II is arranged sloping from the lower left to the upper right in the figure. In this case, the depth of the recess 123a can be set as the maximum depth dimension, minimum depth dimension, or average depth dimension of the bottom of the recess 123a based on the imaginary surface II.

[0090] In the present embodiment, the recess 123a is a groove 123a. The depth dimension of the recess 123a in the present embodiment can be set to the depth dimension from the upper end of one of the pair of groove wall portions 123a2 that divide the groove 123a (the end continuous with the top portion 123b) to the groove bottom portion 123al.

[0091] The depth dimension of a portion of the groove 123a being greater than the depth dimension of another portion of the groove 123a on the outer peripheral edge side means that the depth dimension of a length region of the groove 123a is greater than the depth dimension of another length region disposed at a position further on the outer peripheral edge side than the length region. Alternatively, the depth dimension of a portion of the groove 123a being greater than the depth dimension of another portion of the groove 123a on the outer peripheral edge side can also mean that the depth dimension of a length region of one groove 123a is greater than the depth dimension of a length region of another groove 123a disposed at a position further on the outer peripheral edge side than the length region.

[0092] The depth dimension of a portion of the recess 123a being greater than the depth dimension of another portion on the outer peripheral edge side, in other words, can be said to mean that the protruding dimension of one protrusion 123e is greater than the protruding dimension of another protrusion 123e on the outer peripheral edge side. Here, the protruding dimension of the protrusion 123e means the height of the protruding end 123b from the height of the base end of the protrusion 123e (the same height as the groove bottom portion 123al) as a reference in the protruding direction of the protruding and recessed structure 123.

[0093] As described later, the first bus bar 120 and the second bus bar 200 are fixed by being sandwiched by the shaft head portion 141 and the nut 143. Therefore, in the protruding and recessed region 122a, the region on the side closer to the shaft member 140 is pressed against the second bus bar 200 more strongly than the region further on the outer peripheral edge side than the region. Therefore, in the protruding and recessed region 122a, the closer the region is to the shaft member 140, the greater the depth dimension of the groove 123a, and thus it is possible to embed the second bus bar 200 deeper into the recess 123a in the region where the pressing force of the first bus bar 120 and the second bus bar 200 is strong.

[0094] As described above, the portion of the imaginary surface II on the side close to the shaft member 140 is bulged most toward the protruding direction of the concave-convex structure 123. That is, the protruding end 123b of one protrusion 123e protrudes more toward the protruding direction of the concave-convex structure 123 than the protruding ends 123b of the other protrusions 123e on the outer peripheral edge side. In addition, in the protruding direction of the concave-convex structure 123, the bottoms of the recesses 123a are arranged at a uniform height (a height indicated by the imaginary surface I). In other words, the groove bottoms 123al are the same height in the protruding direction in the entire length region of the recess 123a, and the heights of the groove bottoms 123al of the two adjacent recesses 123a are the same in the protruding direction.

[0095] The protruding end 123b of one protrusion 123e protrudes more toward the protruding direction of the concave-convex structure 123 than the protruding ends 123b of the other protrusions 123e on the outer peripheral edge side, whereby in the joining process described later, it is possible to sequentially insert from the protrusion 123e arranged on the shaft member 140 side to the second bus bar 200.

[0096] Instead of the present embodiment, the imaginary surface II can be a plane perpendicular to the axial direction of the shaft member 140. That is, in the protruding direction of the concave-convex structure 123, the heights of the protruding ends of the plurality of protrusions 123e can be the same as each other.

[0097] As Figure 5 As shown in (b) of FIG. 12, the outer surface of the first bus bar 120 includes a neighboring portion 124. The neighboring portion 124 is covered with the cover portion 130 while being adjacent to the outer peripheral portion 122b (the contact portion 122) when viewed in the axial direction of the shaft member 140. There is a step rising from the outer peripheral portion 122b toward the neighboring portion 124 between the outer peripheral portion 122b and the neighboring portion 124. In other words, the neighboring portion 124 protrudes more toward the protruding direction of the concave-convex structure 123 in the concave-convex structure 123 than the outer peripheral portion 122b, and the height of the boundary between the neighboring portion 124 and the outer peripheral portion 122b changes sharply in the protruding direction. The face rising with respect to the contact portion 122 at the boundary between the neighboring portion 124 and the outer peripheral portion 122b is referred to as a step face 124a (hereinafter, simply referred to as the step face 124a) of the step. The step face 124a is arranged intersecting the contact portion 122, and is preferably arranged perpendicularly to the contact portion 122. The step face 124a is continuous with the side end face (the inward side end face 131) of the cover portion 130. The inward side end face 131 is the side end face of the cover portion 130 on the side closer to the shaft member 140 (particularly, the shaft 142. Refer to FIG. 1). The neighboring portion 124 is arranged on the side closer to the shaft member 140 than the outer peripheral portion 122b. Figure 2The stepped surface 124a is the circumferentially opposite surface of the inner end face 131. The connection between the stepped surface 124a and the inner end face 131 means that there is substantially no step between the stepped surface 124a and the inner end face 131. Specifically, it is preferable that there is substantially no step between the inner end of the inner end face 131 (the end inside the protruding direction of the convex-concave structure 123) and the outer end face 124a (the end outside the protruding direction of the convex-concave structure 123). For example, it is preferable that the step between the stepped surface 124a and the inner end face 131 is smaller than the width of the bottom 123a1 of the groove. Alternatively, the stepped surface 124a and the inner end face 131 may be arranged such that the inner end of the inner end face 131 and the outer end face 124a are close to each other, and the stepped surface 124a and the inner end face 131 intersect each other.

[0098] By connecting the inner end face 131 to the stepped surface 124a, the second busbar 200 (see reference) can be easily connected during the joining process. Figure 6 The desired range (contact portion 122) is disposed on the outer surface of the first busbar 120.

[0099] The first busbar 120 includes a conductive portion 125 and an oxide coating 126. The oxide coating 126 covers the conductive portion 125. The conductive portion 125 refers to the portion of the first busbar 120 formed of a highly conductive component, including copper. The oxide coating 126 is a thin film formed on the surface of the conductive portion 125 by an oxide of the metal used for the conductive portion 125. The oxide coating 126 has insulating properties or a higher resistance than the conductive portion 125. The oxide coating 126 covers at least a portion of the conductive portion 125. In the first busbar 120 that is not coupled to the second busbar 200, the oxide coating 126 at least covers the entire contact surface 122. In the first busbar 120 that is not coupled to the second busbar 200, it is preferable that the thickness of the oxide coating 126 is substantially uniform throughout the entire area. Figure 3 of (a), Figure 3 (b) Figure 5 (a) and Figure 5 In (b), for convenience, the thickness of the oxide coating 126 is depicted as larger than the actual thickness of the oxide coating.

[0100] (Busbar)

[0101] The first busbar 120 may also be provided as a single unit without the main body 110. Figure 4 This is a cross-sectional view illustrating an example of electrical device 1. As described above, in the first busbar 120, a portion of the outer surface is covered by a cover 130. A textured surface 123 is formed on another portion of this outer surface.

[0102] (Electrical equipment)

[0103] The electronic component 100 of the present embodiment can be provided as an electrical device 1 having the electronic component 100. The electrical device 1 has the electronic component 100 and a second bus bar (second bus bar 200). The second bus bar 200 is in contact with the first bus bar 120. Specifically, the second bus bar 200 is in contact with the contact portion 122 on an opposing surface 210 that opposes the contact portion 122. As Figure 3 (a) and Figure 3 (b) of FIG. 10, the top portion 123b that is the protruding tip portion in the concave-convex structure 123 is embedded in the second bus bar 200.

[0104] The electrical device 1 is a device that includes the electronic component 100, and the electrical device 1 in the present embodiment is for use in a vehicle. The electrical device 1 can shut down the electronic circuit in the electrical device 1 itself, and the electrical device 1 can also be electrically connected to other electrical devices.

[0105] The second bus bar 200 is a bus bar that is electrically connected to the first bus bar 120. The second bus bar 200 can be a bus bar for connection to other electrical devices that are electrically connected to the electrical device 1, or can be a bus bar for connection to other electronic components included in the electrical device 1. As Figure 4 indicated in FIG. 11, the second bus bar 200 in the present embodiment is a rod-shaped bus bar. The axial direction of the second bus bar 200 is substantially in line with the axial direction of the shaft member 140.

[0106] The opposing surface 210 in the second bus bar 200 is a partial surface area of the outer surface of the second bus bar 200, and is a surface that includes a portion that is in contact with or is scheduled to be in contact with the first bus bar 120. The opposing surface 210 can also include only a portion or all of the surface that is in contact with or is scheduled to be in contact with the first bus bar 120. The opposing surface 210 can also include a portion of the surface that is disposed in the vicinity of the surface that is in contact with or is scheduled to be in contact with the first bus bar 120, and is not in contact with or is not scheduled to be in contact with the first bus bar 120.

[0107] The embedding of the portion (top portion 123b, etc.) of the first bus bar 120 into the second bus bar 200 means that the portion is disposed inside the maximum outer shape of the second bus bar 200. The maximum outer shape of the second bus bar 200 means the three-dimensional shape that includes the recesses formed on the surface of the second bus bar 200.

[0108] The portion of the first bus bar 120 that is embedded in the second bus bar 200 is not limited to the top portion 123b. It is preferable that not only the top portion 123b, but also a portion of the tip side (top portion 123b side) of the groove wall portion 123a2 is embedded in the second bus bar 200. It is more preferable that, as Figure 5 (a) or Figure 5As shown in (b), more than half of the front end side of the groove wall portion 123a2 is embedded in the second busbar 200. In other words, a portion of the bottom side of the groove wall portion 123a2 and the groove bottom 123a1 are disposed on the outside of the second busbar 200. Alternatively, the entire groove wall portion 123a2 may be embedded in the second busbar 200. In addition, a portion embedded in the second busbar 200 (in this embodiment, the top 123b and a portion of the groove wall portion 123a2) is in contact with the surface of the second busbar 200.

[0109] By embedding the top 123b into the second busbar 200, the contact area between the second busbar 200 and the first busbar 120 can be increased compared to the case where the top 123b is not embedded in the second busbar 200. This, in turn, reduces the contact resistance of the contact surface between the second busbar 200 and the first busbar 120.

[0110] like Figure 5 (a) and Figure 5 As shown in (b), in the electrical device 1 where the second busbar 200 is coupled to the first busbar 120, the first busbar 120 also includes a conductive portion 125 and an oxide coating 126. The oxide coating 126 covers at least a portion of the conductive portion 125. The extent of the conductive portion 125 covered by the oxide coating 126 in the electrical device 1 where the first busbar 120 is coupled to the second busbar 200 differs from the extent of the conductive portion 125 covered by the oxide coating 126 in the electronic component 100 where the second busbar 200 is not coupled. Specifically, the outer peripheral portion 122b is a covered portion covered by the oxide coating 126. On the other hand, at least a portion of the uneven structure 123 is an exposed portion protruding from the oxide coating 126. The exposed portion is embedded in the second busbar 200.

[0111] The covered portion refers to a surface area on the outer surface of the first busbar 120 where an oxide coating 126 is formed, but the conductive portion 125 is not exposed. The exposed portion refers to a surface area on the outer surface of the first busbar 120 where no oxide coating 126 is formed, and the conductive portion 125 is exposed. On the surface of the uneven structure 123, part or all of it is an exposed portion. In this embodiment, only a portion of the surface of the uneven structure 123 is an exposed portion, and the other portion is a covered portion.

[0112] The term "outer peripheral portion 122b is a covering portion" means that at least a portion of the outer peripheral portion 122b is a covering portion. Preferably, as in this embodiment, the outer peripheral portion 122b is substantially entirely a covering portion.

[0113] In addition, in this embodiment, a portion of the groove wall 123a2 becomes an exposed portion, and the rest of the outer surface of the first busbar 120 is a covered portion covered by an oxide coating 126, which will be described in detail later.

[0114] In the electrical apparatus 1 of the present embodiment in which the first bus bar 120 is joined to the second bus bar 200, at least a portion of the exposed portion in the first bus bar 120 is embedded into the second bus bar 200. In the present embodiment, substantially the entire exposed portion is embedded into the second bus bar 200. In the exposed portion embedded into the second bus bar 200, the conductor portion 125 in the first bus bar 120 is in contact with the second bus bar 200.

[0115] Generally, in order to prevent the formation of an oxide film and to make the conductivity good, and in order to protect the conductor portion, the bus bar is plated with a metal such as nickel. The exposed portion in which a portion of the surface of the concave-convex structure 123 is exposed by the conductor portion 125 is where the first bus bar 120 is in contact with the second bus bar 200 and is conductive. Thus, the electrical conductivity can be maintained well without plating with a metal, and therefore the manufacture of the first bus bar 120 can be made easy. Further, the conductor portion 125 is exposed in the concave-convex structure 123 that is in contact with the second bus bar 200, and the outer surface of the other portion in the first bus bar 120 is covered with the oxide film 126, and thus the conductor portion 125 is protected at that portion.

[0116] As shown in (a) of FIG. 1, (b) of FIG. 1, (a) of FIG. 2, and (b) of FIG. 2, the groove wall portion 123a2 is disposed obliquely with respect to the outer peripheral portion 122b. In the electrical apparatus 1 of the present embodiment, as shown in (a) of FIG. 3 and (b) of FIG. 3, at least a portion of the groove wall portion 123a2 is an exposed portion that is in contact with the second bus bar 200. Figure 3 Figure 3 As shown in (a) of FIG. 1, (b) of FIG. 1, (a) of FIG. 2, and (b) of FIG. 2, the groove wall portion 123a2 is disposed obliquely with respect to the outer peripheral portion 122b. In the electrical apparatus 1 of the present embodiment, as shown in (a) of FIG. 3 and (b) of FIG. 3, at least a portion of the groove wall portion 123a2 is an exposed portion that is in contact with the second bus bar 200. Figure 5 Figure 5 As shown in (a) of FIG. 1, (b) of FIG. 1, (a) of FIG. 2, and (b) of FIG. 2, the groove wall portion 123a2 is disposed obliquely with respect to the outer peripheral portion 122b. In the electrical apparatus 1 of the present embodiment, as shown in (a) of FIG. 3 and (b) of FIG. 3, at least a portion of the groove wall portion 123a2 is an exposed portion that is in contact with the second bus bar 200. Figure 5 Figure 5 As shown in (a) of FIG. 1, (b) of FIG. 1, (a) of FIG. 2, and (b) of FIG. 2, the groove wall portion 123a2 is disposed obliquely with respect to the outer peripheral portion 122b. In the electrical apparatus 1 of the present embodiment, as shown in (a) of FIG. 3 and (b) of FIG. 3, at least a portion of the groove wall portion 123a2 is an exposed portion that is in contact with the second bus bar 200.

[0117] In the present embodiment, a portion of the groove wall portion 123a2 on the side of the top portion 123b is an exposed portion, and a portion on the side of the groove bottom portion 123a1 is a covered portion. However, the covered portion can be disposed with the oxide film 126 remaining locally on the portion of the groove wall portion 123a2 on the side of the top portion 123b.

[0118] In the present embodiment, the first bus bar 120 is in contact with the second bus bar 200 at the top portion 123b and the groove wall portion 123a2 (particularly, the portion on the side of the top portion 123b), but the groove bottom portion 123a1 is separated from the second bus bar 200. In other words, in the vicinity of the groove bottom portion 123a1, a gap portion is provided inside the groove 123a, which is partitioned by the groove bottom portion 123a1, the groove wall portion 123a2, and the second bus bar 200. The groove bottom portion 123a1 that is separated from the second bus bar 200 is at least a portion of the covered portion.

[0119] ​​​like Figure 3 As shown in (b), the groove wall portion 123a2 is arranged obliquely relative to the outer peripheral portion 122b or the adjacent portion 124, so that in the joining process described later, the groove wall portion 123a2 is arranged obliquely relative to the thickness direction of the second busbar 200 pressing against the first busbar 120. Therefore, compared with the case where the groove wall portion 123a2 is perpendicular to the outer peripheral portion 122b (i.e., standing vertically) or parallel to the outer peripheral portion 122b, the oxide coating 126 on the groove wall portion 123a2 is more easily cut by the second busbar 200.

[0120] Furthermore, compared to the case where the groove wall portion 123a2 is perpendicular to or parallel to the outer peripheral portion 122b, the inclination relative to the outer peripheral portion 122b increases the contact area between the groove wall portion 123a2 and the second busbar 200 when the top 123b is embedded to the same depth in the second busbar 200. This reduces the contact resistance.

[0121] Furthermore, in this embodiment, at least a portion of the top 123b is a covered portion. The thickness of the oxide coating 126 in the top 123b is preferably less than the thickness of the oxide coating 126 in the bottom 123a1 of the groove. This ensures good conductivity between the first busbar 120 and the second busbar 200 at the top 123b. Alternatively, the entire top 123b may be an exposed portion with the conductor portion 125 exposed.

[0122] Alternatively, in this embodiment, the oxide coating 126 may remain on the surface of the uneven structure 123, with the entire area of ​​the uneven structure 123 being a covered portion by the oxide coating 126. In this case, the thickness of the oxide coating 126 may be substantially uniform or uneven in the uneven structure 123. For example, the oxide coating 126 embedded in the second busbar 200 may be thinner than the oxide coating 126 disposed on the outside of the second busbar 200. For example, the thickness of the oxide coating 126 covering a portion of the top 123b side of the groove wall 123a2 may be smaller than the thickness of the oxide coating 126 covering the bottom 123a1 of the groove.

[0123] like Figure 5 (a) or Figure 5 As shown in (b), the second busbar 200 includes a second conductor portion 220 and a second oxide coating 230 covering the second conductor portion 220. A portion of the outer surface of the second busbar 200 that contacts the first busbar 120 (a portion of the opposing surface 210) is a second exposed portion of the second conductor portion 220. Another portion of the outer surface of the second busbar 200 is a second covered portion covered by the second oxide coating 230.

[0124] The second conductor portion 220 refers to a portion formed of a member having good electrical conductivity, such as a metal including copper, in the second bus bar 200. The second oxide film 230 is a thin layer of film formed on the surface of the second conductor portion 220 by oxidation of the metal in the second conductor portion 220. The second oxide film 230 has insulating properties or has a higher electrical resistance than the second conductor portion 220. The second oxide film 230 covers at least a portion of the second conductor portion 220. The second oxide film 230 preferably covers substantially the entire second conductor portion 220. Here, the second oxide film 230 covering substantially the entire second conductor portion 220 includes a case where a small surface area (second exposed portion to be described later) of the second conductor portion 220 is exposed without being covered by the oxide film 126 in a portion of the opposing surface 210.

[0125] A portion or all of the portion of the opposing surface 210 that contacts the first bus bar 120 can be a second exposed portion in which the second conductor portion 220 is exposed, and a portion of the opposing surface 210 that does not contact the first bus bar 120 can be a second covered portion that is covered by the second oxide film 230. Specifically, a portion of the opposing surface 210 that contacts the groove wall portion 123a2 in opposition is the second exposed portion. In addition, a portion of the opposing surface 210 that contacts the top portion 123b or the outer peripheral portion 122b in opposition is the second covered portion. Also, a portion of the opposing surface 210 that is separated from the groove bottom portion 123al in opposition is also the second covered portion. The thickness of the second oxide film 230 in the second covered portion that is separated from the groove bottom portion 123al in opposition is preferably greater than the thickness of the second oxide film 230 in the portion that contacts the top portion 123b or the outer peripheral portion 122b in opposition.

[0126] By covering a portion of the outer surface of the second bus bar 200 with the second oxide film 230 other than the portion that contacts the first bus bar 120 as the second exposed portion, plating of the second bus bar 200 can not be needed.

[0127] As described above, the engagement of the first bus bar 120 and the second bus bar 200 is maintained by the shaft member 140. The shaft member 140 is a long member having a shaft portion 142 that is inserted through the through hole 121 of the first bus bar 120 and the hole provided in the second bus bar 200. As shown in FIG. 1, in the present embodiment, the shaft member 140 is a bolt. The shaft member 140 has a shaft head portion 141 having a larger diameter than the shaft portion 142 at one end of the shaft portion 142 that is inserted through the bus bars. Figure 6

[0128] ​In the present embodiment, the shaft portion 142 is provided with a helical thread groove, and the second bus bar 200 is provided with an internal thread portion (a bottomed recess or a through-hole) corresponding to the shape and size of the shaft portion 142 having the thread groove. The shaft portion 142 is fitted to the internal thread portion of the second bus bar 200. In a state in which the second bus bar 200 is engaged with the first bus bar 120, the shaft head portion 141 exerts a force on the first bus bar 120 toward the second bus bar 200, thereby engaging the first bus bar 120 with the second bus bar 200. The first bus bar 120 and the second bus bar 200 can also be fixed by press-bonding the shaft portion 142 to the peripheral wall surface of the bottomed recess or the through-hole defined by the peripheral wall surface provided in the second bus bar 200. Alternatively, the first bus bar 120 and the second bus bar 200 can also be fixed by engaging the shaft portion 142 with the bottomed recess or the peripheral wall surface defining the through-hole provided in the second bus bar 200 using an adhesive or the like.

[0129] Instead of the present embodiment, the second bus bar 200 can be a plate-shaped bus bar extending in substantially the same direction as the extension direction of the first bus bar 120. In this case, the first bus bar 120 and the second bus bar 200 can be fixed by inserting the shaft member 140 through the through-hole 121 of the first bus bar 120 and the through-hole provided in the second bus bar 200 and screwing a nut onto the other end of the shaft member 140 on the side opposite to the shaft head portion 141.

[0130] The shaft member 140 can not have the shaft head portion 141. In this case, for example, after the shaft portion 142 is inserted through the through-hole 121, the end portion of the shaft member 140 can be fixed to a portion of the first bus bar 120 by welding or the like. Alternatively, the end portion of the shaft member 140 can be fixed to a wall portion of another member by welding or the like.

[0131] (Method for manufacturing electronic component)

[0132] Hereinafter, a method (hereinafter, sometimes referred to as the present method) for manufacturing the electronic component 100 of the present embodiment will be described.

[0133] Figure 6 is a schematic cross-sectional view showing an intermediate stage of the molding step of the present method.

[0134] First, an outline of the present method will be described.

[0135] The electronic component 100 manufactured by the present method includes a main body portion 110 including an electronic element 111, a bus bar (first bus bar 120) electrically connected to the electronic element 111, and a cover portion 130 covering a portion (at least the adjacent portion 124) of the outer surface of the first bus bar 120. Details of the electronic component 100 will be described later.

[0136] This method includes a molding process in which a cover material is disposed on the cover portion to form the cover portion 130.

[0137] Next, this method will be explained in detail.

[0138] like Figure 6 As shown, in the molding process, a pressing member 300 with a pressing surface 310 is used, which has unevenness. The member pressing the member 300 is the part that presses onto the conductive material (hereinafter, the conductive material is sometimes referred to as the first busbar 120) used to form the first busbar 120. As will be described later, the cover portion 130 (see reference 120) is injection molded as in this embodiment. Figure 4 In the case of ( ), the pressing member 300 may also be a mold for injection molding. Alternatively, the pressing member 300 may also be a shielding member that covers and protects the contact portion 122 as described later.

[0139] During the molding process, the cover part 130 (refer to) Figure 4 ) is formed, and a concave-convex structure 123 is formed on the first busbar 120 (see reference) Figure 4 By forming the cover 130 in the molding process and forming the convex-concave structure 123 in the first busbar 120, it is not necessary to set up a process of imprinting the convex-concave structure 123 in the first busbar 120 outside the molding process, thus making the manufacturing of the electronic component 100 easier.

[0140] Specifically, the pressing member 300 covers the contact portion 122 by pressing the pressing surface 310 against another portion of the outer surface of the first busbar 120, and a cover 130 is formed by distributing a cover material around the pressing member 300. The other portion of the outer surface of the first busbar 120 pressed by the pressing surface 310 is a surface area including part or all of the contact portion 122. In other words, this other portion is a surface area including a predetermined portion 122a1 formed by a predetermined concave-convex region 122a. Sufficient force is applied to press the pressing surface 310 against the outer surface of the first busbar 120 to the extent that the concave-convex region of the pressing surface 310 is transferred to the outer surface of the first busbar 120, and to the extent that the cover material does not substantially penetrate between the pressing surface 310 and the first busbar 120. Specifically, the pressing member 300 in… Figure 6 It is pressed against the first busbar 120 in the direction of the arrow shown (pressing direction).

[0141] Here, "the cover material is arranged around the pressing member 300" means that the cover material is arranged around a part of the pressing member 300 having a pressing surface 310 that is pressed against the first busbar 120.

[0142] The cover material is used to form the cover portion 130 (refer to). Figure 4The cover member is a material that contains a liquid. The cover member is a fluid. Figure 7 In the present embodiment, the pressing member 300 is crimped to the first bus bar 120. In the present embodiment, a gap 340 is generated between the pressing member 300 and the first bus bar 120. In the present embodiment, the cover portion 130 is formed by injection molding. That is, the cover portion 130 is molded by injecting a cover member into the gap 340 between a molding die that is the pressing member 300 and the first bus bar 120. Figure 7 Instead of the present embodiment of the injection molding, the cover portion 130 can be formed by impregnating a portion of the first bus bar 120 and a portion of the pressing member 300 in the cover member while the pressing member 300 is crimped to the first bus bar 120, or the cover portion 130 can be formed by coating the cover member around the pressing member 300.

[0143] By being crimped to the contact portion 122 by the pressing surface 310, the concavo-convex of the pressing surface 310 is transferred to the contact portion 122 to form the concavo-convex structure 123 (see FIG. 3B).

[0144] Figure 4 As described above, the concavo-convex 320 is formed in the pressing surface 310. The concavo-convex 320 corresponds to the shape of the concavo-convex structure 123.

[0145] The protruding height of the convex portion in the concavo-convex 320 of the pressing surface 310 is preferably greater than the depth of the corresponding concave portion 123a (groove 123a) in the concavo-convex structure 123. The protruding height of the convex portion refers to the dimension of the convex portion in the direction in which the convex portion protrudes. The pressing surface 310 having the concavo-convex 320 with such a large protruding height can be pressed against the first bus bar 120 until only a portion of the front end side of each convex portion of the concavo-convex 320 is embedded in the first bus bar 120. In other words, the pressing surface 310 can be pressed against the first bus bar 120 to the extent that the concave portion formed between two convex portions of the pressing surface 310 is not completely embedded in the first bus bar 120.

[0146] Thus, the portion of the first bus bar 120 that is pushed out by the convex portion of the pressing surface 310 can enter the concave portion formed between the two convex portions. In this way, by providing a space for the portion of the first bus bar 120 that is pushed out to enter the concave portion, the situation in which the pressing member 300 is pushed back by the portion is reduced, and thus the concavo-convex structure 123 can be easily formed on the first bus bar 120 or the conductive material. In addition, if the portion of the first bus bar 120 that is pushed out by the convex portion of the pressing surface 310 retreats into the concave portion, the depth of the groove 123a formed becomes greater than the depth to which the convex portion is embedded in the first bus bar 120. Thus, a groove 123a of a sufficient depth can be formed while minimizing the force with which the pressing member 300 is pressed.

[0147] ​In the pressing surface 310, the concavo-convex 320 is preferably formed only in a part. Specifically, the pressing surface 310 preferably has a flat surface (hereinafter, also referred to as a flat surface) in which the concavo-convex 320 is not formed around the concavo-convex 320. By the flat surface, the above-described outer peripheral portion 122b is flatly formed. The convex portion in the concavo-convex 320 can protrude in a protruding direction of the concavo-convex 320 than the flat surface, or the flat surface can protrude in the protruding direction than the convex portion in the concavo-convex 320.

[0148] As described above, the electronic component 100 includes the shaft member 140 that is inserted through the first bus bar 120. In addition, the first bus bar 120 has the through-hole 121 that is opened in the contact portion 122 and the back surface 127 (refer to Figure 1 (a)) located on the opposite side in the front-rear direction of the contact portion 122. The through-hole 121 in the present embodiment has a shape and a size that are small to the extent that a portion of the first bus bar 120 interferes with the shaft member 140 when the shaft 142 of the shaft member 140 is inserted through. For example, in a case where the shape of the through-hole 121 in the through direction of the through-hole 121 is circular and the shape of the cross section of the shaft 142 is circular, the radius of the through-hole 121 is smaller than the radius of the cross section of the shaft 142. Thereby, it is possible to erect the shaft member 140 in the through-hole 121 as described later.

[0149] The present method can also include an insertion process performed before the molding process. In the insertion process, the shaft member 140 is inserted into the through-hole 121 from the back surface 127 toward the contact portion 122 side (in the y direction) while being pressed against the peripheral wall surface 121b that divides the through-hole 121 to be erected in the through-hole 121. The shaft member 140 is erected in the through-hole 121 means that the shaft member 140 is erected in a manner that intersects the contact portion 122, and is preferably perpendicularly erected. In the present embodiment, the shaft member 140 is inserted through the through-hole 121 from the other end on the side opposite the shaft head portion 141 and is inserted through the through-hole 121 from the lower side to the upper side in the z direction until the shaft head portion 141 abuts against the first bus bar 120. The shaft member 140 is inserted through the through-hole 121 in a state where the shaft head portion 141 is positioned in the through-hole 121. Figure 6 In the insertion process, the shaft member 140 is inserted into the through-hole 121 from the back surface 127 toward the contact portion 122 side (in the y direction) while being pressed against the peripheral wall surface 121b that divides the through-hole 121 to be erected in the through-hole 121. The shaft member 140 is erected in the through-hole 121 means that the shaft member 140 is erected in a manner that intersects the contact portion 122, and is preferably perpendicularly erected. In the present embodiment, the shaft member 140 is inserted through the through-hole 121 from the other end on the side opposite the shaft head portion 141 and is inserted through the through-hole 121 from the lower side to the upper side in the z direction until the shaft head portion 141 abuts against the first bus bar 120. The shaft member 140 is inserted through the through-hole 121 in a state where the shaft head portion 141 is positioned in the through-hole 121.

[0150] In addition, the pressing member 300 in the present embodiment has a relief hole 330 that receives the shaft member 140 in a molding process.

[0151] In the above-described molding process in which the pressing member 300 is press-bonded to the first bus bar 120 with the shaft member 140 inserted therethrough, as shown in Figure 6 , the shaft member 140 is received in the relief hole 330. The relief hole 330 is a bottomed hole or a through hole provided in the pressing member 300. The relief hole 330 extends in a direction in which the pressing member 300 is press-bonded to the first bus bar 120. The shape and size of a cross section of the relief hole 330 with respect to the extending direction are preferably substantially the same as the shape and size of the cross section of the shaft portion 142. Thus, the pressing member 300 can be press-bonded to a desired position in the first bus bar 120.

[0152] Instead of the present embodiment, the shape and size of the cross section of the relief hole 330 with respect to the extending direction can be made larger than the shape and size of the cross section of the shaft portion 142. Thus, a predetermined portion of the contact portion 122 that forms the inner peripheral portion 122c is not press-bonded by the press surface 310 of the pressing member 300. Thus, in the first bus bar 120 after the molding process, the inner peripheral portion 122c can protrude more than the outer peripheral portion 122b toward the protruding direction of the relief structure 123.

[0153] By inserting the shaft member 140 before the relief structure 123 is formed, deformation of the relief structure 123 or flattening of the relief structure 123 due to support of the outer surface of the first bus bar 120 by a jig is prevented, and the relief region 122a is prevented from being substantially flat.

[0154] In addition, the series of processes including the molding process or the insertion process in the present method can be used as a method for manufacturing the first bus bar 120, not as a method for manufacturing the electronic component 100 that is a part of the electronic component 100.

[0155] (Method for manufacturing electrical device)

[0156] Hereinafter, a method for manufacturing the electrical device 1 in the present embodiment (hereinafter, the method for manufacturing the electrical device 1 is sometimes referred to as the present method in addition to the method for manufacturing the electronic component 100) will be described. The present method includes a joining process for joining the first bus bar 120 and the second bus bar 200.

[0157] As shown in Figure 4 , in the joining process, first, the first bus bar 120 and the second bus bar 200 are arranged so that the contact portion 122 opposes the opposing surface 210 of the second bus bar 200. Here, the contact portion 122 opposing the opposing surface 210 means that Figure 4As shown, the contact portion 122 and the opposing surface 210 have the same directional components, but preferably the contact portion 122 and the opposing surface 210 are substantially parallel.

[0158] like Figure 5 (a) or Figure 5 As shown in (b), in the joining process, a portion of the concave-convex structure 123 is then embedded into the second busbar 200 by pressing the contact portion 122 against the opposing surface 210. The contact surface 122 and the opposing surface 210 are pressed together by applying stress to each other in a direction that intersects (preferably perpendicular to) the contact surfaces of the contact surface 122 and the opposing surface 210. Hereinafter, this direction will sometimes be referred to as the pressing direction of the contact surface 122 and the opposing surface 210, or simply as the pressing direction.

[0159] Here, the portion of the uneven structure 123 embedded in the second busbar 200 specifically refers to the top 123b. To allow the top 123b to embed into the second busbar 200, the contact portion 122 is pressed against the opposing surface 210 with sufficient force. At least the top 123b and a portion of the top 123b side of the recess wall portion 123a2 are embedded into the second busbar 200. The opposing surface 210, which was generally flat before embedding, is transferred to the opposing surface 210 through the embedding of the top 123b, thus making the opposing surface 210 a surface with unevenness in a portion.

[0160] The crimping of the contact portion 122 with the opposing surface 210 can also be performed by applying force to the first busbar 120 toward the second busbar 200 via the shaft head 141. Alternatively, the crimping of the contact portion 122 with the opposing surface 210 can also be performed by forcefully clamping the first busbar 120 and the second busbar 200 using a fixture (not shown).

[0161] As described above, the first busbar 120 includes a conductive portion 125 and an oxide coating 126 covering the conductive portion 125.

[0162] In this embodiment, during the bonding process described above, by pressing the contact portion 122 against the opposing surface 210, a portion of the oxide coating 126 pressed onto the second busbar 200 is removed, exposing a portion of the conductive portion 125. The exposed portion comes into contact with the second busbar 200.

[0163] In the process of pressing the contact portion 122 against the opposing surface 210 so as to embed a portion of the first bus bar 120, particularly the top portion 123b and a portion of the groove wall portion 123a2 on the top portion 123b side, into the second bus bar 200, the first bus bar 120 and the second bus bar 200 rub against each other. As a result, a portion of the surface of the oxidation film 126 that is rubbed by the second bus bar 200 is removed and thinned, or is completely removed so as to expose the conductor portion 125, in the oxidation film 126 that covers the outer surface of the first bus bar 120. Specifically, in the present embodiment, at least the top portion 123b and the groove wall portion 123a2 are pressed against each other and rub against each other with the second bus bar 200. As a result, the oxidation film 126 that covers the top portion 123b or the groove wall portion 123a2 is removed. More specifically, the oxidation film 126 that covers a portion of the groove wall portion 123a2 on the top portion 123b side is removed so as to expose the conductor portion 125 on the inner side, and a portion of the surface of the oxidation film 126 that covers the top portion 123b is removed and thinned.

[0164] The manner in which the oxidation film 126 is removed differs between the top portion 123b and the groove wall portion 123a2 because the manner in which the top portion 123b or the groove wall portion 123a2 is pressed against the opposing surface 210 differs between the two. Specifically, in the present embodiment, the flat top portion 123b is disposed substantially perpendicular to the pressing direction. On the other hand, the groove wall portion 123a2 is disposed parallel to or preferably obliquely with respect to the pressing direction. Therefore, the oxidation film 126 that covers the groove wall portion 123a2 is more easily peeled off by the pressing of the first bus bar 120 against the second bus bar 200, as compared to the oxidation film 126 that covers the top portion 123b. As a result, the oxidation film 126 that covers the groove wall portion 123a2 is sufficiently removed to the extent that the conductor portion 125 is exposed, and the oxidation film 126 that covers the top portion 123b is removed to the extent that the oxidation film 126 remains thinly.

[0165] The portion of the groove wall portion 123a2 on the top portion 123b side that is removed of the oxidation film 126 becomes an exposed portion. At the exposed portion of the groove wall portion 123a2, the second bus bar 200 directly contacts the conductor portion 125 of the first bus bar 120. At the top portion 123b, the oxidation film 126 in the first bus bar 120 contacts the second bus bar 200.

[0166] In the present embodiment, the oxidation film 126 that covers the top portion 123b remains thinly, but instead of the present embodiment, the oxidation film 126 that covers the top portion 123b can be completely removed so as to make the top portion 123b an exposed portion. In this case, in at least a portion of the top portion 123b that is removed of the oxidation film 126 and becomes an exposed portion, the conductor portion 125 directly contacts the second bus bar 200.

[0167] In addition, the outer peripheral portion 122b can or can not be in contact with the opposing surface 210 of the second bus bar 200. In the case where the outer peripheral portion 122b is in contact with the opposing surface 210 of the second bus bar 200, a portion of the surface of the oxidation film 126 covering the outer peripheral portion 122b opposing and in contact with the second bus bar 200 can be removed and thinned. Alternatively, the oxidation film 126 covering the portion of the outer peripheral portion 122b can also be removed to the extent that the conductive portion 125 is exposed.

[0168] Instead of the present embodiment, even if the second bus bar 200 is crimped, the oxidation film 126 can not be completely removed but can remain in the entire area of the concave-convex structure 123. Specifically, the oxidation film 126 that is thinned by being peeled off due to friction can also remain in the entire area of the concave-convex structure 123. In this case, the conduction between the second bus bar 200 and the first bus bar 120 becomes good through the thinned oxidation film 126. In addition, since the concave-convex structure 123 including the groove wall portion 123a2 and the like is the covering portion as a whole, the conductive portion 125 can be protected in substantially the entire area of the concave-convex structure 123.

[0169] As described above, the second bus bar 200 also includes a second conductive portion 220 and a second oxidation film 230 covering the second conductive portion 220. The second oxidation film 230 covering the second bus bar 200 is removed and thinned or peeled off to the extent that the conductive portion 125 is exposed by the top portion 123b and the groove wall portion 123a2 rubbing against the second bus bar 200. Specifically, in the present embodiment, a portion of the outer surface of the second bus bar 200 opposing the groove wall portion 123a2 after the joining process becomes a second exposed portion that is not covered by the second oxidation film 230. In addition, a portion of the outer surface of the second bus bar 200 opposing the top portion 123b after the joining process is thinned due to abrasion of the second oxidation film 230. The thickness of the second oxidation film 230 covering a portion of the outer surface of the second bus bar 200 opposing the top portion 123b is smaller than the thickness of the second oxidation film 230 covering a portion of the outer surface of the second bus bar 200 opposing the groove bottom portion 123al.

[0170] In addition, the present application is not limited to the above-described embodiments, and various modifications, improvements, and the like are included as long as the object of the present application can be achieved.

[0171] The following modified examples can be appropriately combined.

[0172] In the present embodiment, the electronic component 100 can also not have the shaft member 140 and the through-hole 121. In this case, the first bus bar 120 and the second bus bar 200 can also be joined by sandwiching the first bus bar 120 and the second bus bar 200 with other members.

[0173] The manufacturing method of the electronic component 100, the electrical apparatus 1, and the first bus bar 120 in the present embodiment is not limited to the above-described method.

[0174] For example, the insertion process can also be performed after the molding process. In this case, the groove 123a can also be formed deep enough. Thereby, even when the shaft member 140 is inserted through the through-hole 121 while the contact portion 122 of the first bus bar 120 is pressed and supported by a jig, the groove 123a can have a sufficient depth dimension.

[0175] In addition, the engraving process of forming the relief structure 123 can also be performed separately from the molding process. For example, the molding process can also be performed after the engraving process. In this case, the molding die used in the molding process so as not to dispose the cover member on the contact portion 122 can be a molding die in which the surface of the molding die presses the periphery (for example, the outer peripheral portion 122b) of the contact portion 122 and separates from the central side (the relief region forming predetermined portion 122a1) of the contact portion 122.

[0176] In addition, in the insertion process, the shaft member 140 can also be inserted through from the contact portion 122 toward the back surface 127 side. In this case, it is preferable that the shaft member 140 does not have the shaft head portion 141.

[0177] The above-described embodiments include the following technical ideas.

[0178] (1) A manufacturing method of an electronic component including: a main body portion including an electronic element; a bus bar electrically connected to the electronic element; and a cover portion covering a part of an outer surface of the bus bar, wherein the manufacturing method includes a molding process of disposing a cover member to mold the cover portion, in the molding process, a pressing member having a pressing surface with a relief is used, the pressing member covers another part of the outer surface in a manner that the pressing surface is pressed against the other part, the cover member is disposed around the pressing member to mold the cover portion, and the relief is transferred to the other part by the pressing surface being pressed against the other part to form a relief structure.

[0179] (2) The method of manufacturing an electronic component according to (1), wherein the electronic component includes a shaft member inserted through the bus bar having a through-hole open at the other portion and a back surface opposite to the other portion in a surface-depth direction of the other portion, the method of manufacturing an electronic component includes an insertion process of inserting the shaft member into the through-hole while pressing the shaft member against a peripheral wall surface dividing the through-hole to stand up in the through-hole from the back surface toward the other portion side before the molding process, the pressing member having a relief hole in which the shaft member is accommodated in the molding process.

[0180] (3) An electronic component including: a main body portion including an electronic element; a bus bar electrically connected to the electronic element; and a cover portion covering a part of an outer surface of the bus bar, wherein, in the outer surface, a concave-convex region having a concave-convex structure is formed in a contact portion exposed from the cover portion.

[0181] (4) The electronic component according to (3), wherein the bus bar has a through-hole open at the contact portion, the electronic component has a shaft member inserted through the through-hole, and the concave-convex region is disposed around the shaft member when viewed in an axial direction of the shaft member.

[0182] (5) The electronic component according to (4), wherein the contact portion includes an inner peripheral portion disposed on a side closer to the shaft member than the concave-convex region, and the inner peripheral portion is flat.

[0183] (6) The electronic component according to (5), wherein the contact portion includes an outer peripheral portion disposed around the concave-convex region, and the inner peripheral portion protrudes in a protruding direction of the concave-convex structure more than the outer peripheral portion.

[0184] (7) The electronic component according to (5) or (6), wherein the concave-convex structure has a plurality of protruding portions, and protruding ends of the protruding portions protrude in the protruding direction of the concave-convex structure more than the inner peripheral portion.

[0185] (8) The electronic component according to any one of (4) to (7), wherein the concave-convex structure has a bottomed concave portion, and a depth dimension of a part of the concave portion is larger than a depth dimension of another part of the concave portion disposed on a side closer to a peripheral edge of the concave-convex region.

[0186] (9) The electronic component according to any one of (4) to (8), wherein the contact portion includes a peripheral portion disposed around the uneven region, the outer surface of the bus bar includes an adjacent portion that is adjacent to the peripheral portion and is covered by the cover portion when viewed in the axial direction of the shaft member, and a step that rises from the peripheral portion toward the adjacent portion is present between the peripheral portion and the adjacent portion, and a step face of the step is continuous with a side end face of the cover portion.

[0187] (10) A bus bar in which a portion of an outer surface of the bus bar is covered by a cover portion, and an uneven structure is formed in another portion of the outer surface.

[0188] REFERENCE NUMERALS

[0189] 1: electrical equipment; 100: electronic component; 110: main body portion; 111: electronic element; 120: first bus bar; 121: through-hole; 121b: peripheral wall face; 122: contact portion; 122a: uneven region; 122a1: uneven region formation predetermined portion; 122b: peripheral portion; 122c: inner peripheral portion; 123: uneven structure; 123a: groove, recess; 123a1: groove bottom portion; 123a2: groove wall portion; 123b: top portion, protruding end; 123e: protruding portion; 124: adjacent portion; 124a: step face; 125: conductive body portion; 126: oxidation film; 127: back face; 130: cover portion; 131: inward side end face; 140: shaft member; 141: shaft head portion; 142: shaft portion; 143: nut; 200: second bus bar; 210: opposing face; 220: second conductive body portion; 230: second oxidation film; 300: pressing member; 310: pressing face; 320: unevenness; 330: avoidance hole; 340: gap.

Claims

1. A method for manufacturing an electronic component, the electronic component comprising: The main body, which contains electronic components; Busbar, which is electrically connected to the electronic components; and A cover portion that covers a portion of the outer surface of the busbar. in, The manufacturing method includes the following molding process: forming the cover portion by configuring the cover material on the portion. In the molding process, a pressing member with a pressing surface having concave and convex features is used. The pressing member covers another part of the outer surface by pressing the pressing surface against it. The cover material is arranged around the pressing member to form the cover portion, and the concave and convex features are transferred to the other part by pressing the pressing surface against it, thereby forming a concave and convex structure.

2. The method for manufacturing an electronic component according to claim 1, wherein, The electronic component includes a shaft component that is inserted through the busbar. The busbar has a through hole with an opening on the back side of the other part and on the opposite side in the inside-out direction of the other part. The manufacturing method includes the following insertion step: the insertion step is performed before the forming step, wherein the shaft component is pressed against the peripheral wall surface that defines the through hole on one side while being inserted from the back side toward the other part of the through hole and erected in the through hole. The pressing component has a clearance hole for receiving the shaft component during the molding process.

3. An electronic component comprising: The main body, which contains electronic components; Busbar, which is electrically connected to the electronic components; and A cover portion that covers a portion of the outer surface of the busbar. in, On the outer surface, a concave-convex region with an uneven structure is formed in the contact portion exposed from the cover.

4. The electronic component according to claim 3, wherein, The busbar has a through hole that opens at the contact portion. The electronic component has a shaft component that is inserted through the through hole. When viewed along the axial direction of the shaft component, the uneven regions are arranged around the shaft component.

5. The electronic component according to claim 4, wherein, The contact portion includes an inner peripheral portion located on the side closer to the shaft component than the uneven region. The inner periphery is flat.

6. The electronic component according to claim 5, wherein, The contact portion includes an outer peripheral portion disposed around the uneven region. The inner peripheral portion protrudes in the protruding direction of the concave-convex structure more than the outer peripheral portion.

7. The electronic component according to claim 5 or 6, wherein, The concave-convex structure has multiple protrusions. The protruding end of the protrusion protrudes in the protruding direction of the concave-convex structure more than the inner peripheral portion.

8. The electronic component according to any one of claims 4 to 7, wherein, The concave-convex structure has a bottomed concave portion. The depth dimension of a portion of the recess is greater than the depth dimension of another portion of the recess located on the side closest to the periphery of the convex-concave region.

9. The electronic component according to any one of claims 4 to 8, wherein, The contact portion includes an outer peripheral portion disposed around the uneven region. The outer surface of the busbar includes an adjacent portion that, when viewed along the axial direction of the shaft component, is adjacent to the outer peripheral portion and is covered by the cover portion. There is a step between the outer peripheral portion and the adjacent portion that rises from the outer peripheral portion toward the adjacent portion. The step surface of the step is connected to the side end face of the cover.

10. A busbar, wherein, A portion of the outer surface of the busbar is covered by a cover. Another part of the outer surface has an uneven texture.

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