Joining method, method for producing motor control device, joining structure, and motor control device

Abstract

In one aspect, a joining method according to the present invention is for joining first conductive parts of a first member and a second conductive part of a second member in a first direction. The first member has a plurality of first conductive parts, which are disposed spaced apart in a second direction that intersects with the first direction. The method comprises: attaching, to the plurality of first conductive parts and the second conductive part, a cap having a holding part which at least partially surrounds an axis extending in a third direction that intersects the first direction and the second direction, so as to hold the plurality of first conductive parts and the second conductive part together with the holding part; applying an external force in the first direction to the holding part at a position between adjacent first conductive parts to cause deformation, and fixing a plurality of joining parts of the first conductive parts and the second conductive part; and welding the plurality of joining parts.

Description

Bonding method, method for manufacturing a motor control device, bonding structure, and motor control device

[0001] The present invention relates to a bonding method, a method for manufacturing a motor control device, a bonding structure, and a motor control device.

[0002] Electronic components typified by film capacitors generally have lead wire types with linear terminals. In the case of high voltage and large current, welding is often used for bonding with a bus bar that serves as an energization path. However, in welding a lead wire and a bus bar, it is necessary to suppress variations in bonding strength and have a bonding strength that can withstand impacts and vibrations. For this purpose, it is desirable to align the lead wire and the bus bar at an appropriate position and then perform welding in a state where they are in contact with each other and surface pressure is applied.

[0003] Japanese Patent Application Laid-Open No. 2014-050118 discloses a configuration for welding bus bars together by joining two members using a C-shaped cap composed of intersecting straight lines and a method for joining and fixing two members using low melting point plating or the like.

[0004] Japanese Patent Application Laid-Open: Japanese Patent Application Laid-Open No. 2014-050118

[0005] For example, when joining a member having two lead wires such as a film capacitor to a bus bar, it is necessary to align the two lead wires with respect to the bus bar respectively. However, in Patent Document 1, the members to be joined are one by one, and it cannot be applied when joining independently at a plurality of locations. Therefore, when joining independently in a state where a plurality of locations are in contact with each other and surface pressure is applied, there is a problem that it takes time to adjust the positions of the two members and productivity decreases.

[0006] The present invention has been made in consideration of the above points, and an object thereof is to provide a bonding method, a method for manufacturing a motor control device, a bonding structure, and a motor control device that can easily bond two members in a state where a plurality of locations are in contact with each other and surface pressure is applied.

[0007] One aspect of the joining method of the present invention is a joining method for joining a first conductive portion of a first member and a second conductive portion of a second member in a first direction, wherein the first member has a plurality of first conductive portions arranged at intervals in a second direction intersecting the first direction, and a cap having a holding portion that surrounds at least a part of the periphery of an axis extending in a third direction intersecting the first and second directions is attached to the plurality of first conductive portions and the second conductive portions, the plurality of first conductive portions and the second conductive portions are held together by the holding portion, an external force in the first direction is applied to the holding portion at a position between adjacent first conductive portions to deform it, the plurality of joining locations of the first conductive portions and the second conductive portions are fixed, and the plurality of joining locations are welded.

[0008] One aspect of the present invention relates to a method for manufacturing a motor control device, which controls the supply of power to a motor via a plurality of first conductive parts of a capacitor joined by welding and a second conductive part of a busbar, and includes joining the plurality of first conductive parts of the capacitor and the second conductive part of the busbar by the joining method of one aspect of the above-described joining method.

[0009] One aspect of the joining structure of the present invention is a joining structure for joining a first conductive portion of a first member and a second conductive portion of a second member in a first direction, wherein the first member has a plurality of first conductive portions arranged at intervals in a second direction intersecting the first direction, and is equipped with a cap having a holding portion that surrounds at least a part of the periphery of an axis extending in a third direction that intersects the first and second directions respectively, and a deformed portion that is provided when an external force in the first direction is applied to the holding portion and deforms, wherein the plurality of first conductive portions and second conductive portions are held together by the holding portion, and the plurality of joining locations of the first conductive portions and second conductive portions are welded in a fixed state by the holding portions located on both sides in the second direction, sandwiching the deformed portion that is deformed in the first direction between adjacent first conductive portions.

[0010] One aspect of the motor control device of the present invention is a motor control device that controls the supply of power to a motor via a plurality of first conductive parts of a joined capacitor and a second conductive part of a busbar, wherein the plurality of first conductive parts of the capacitor and the second conductive part of the busbar are joined in the joining structure of the above aspect.

[0011] According to one aspect of the present invention, two members can be easily joined together while in contact with each other at multiple points and under surface pressure.

[0012] Figure 1 is a diagram showing the control system of the motor control device of this embodiment. Figure 2 is an exploded perspective view of the inverter module of this embodiment. Figure 3 is an external perspective view of the inverter module of this embodiment. Figure 4 is a plan view of the cover member as seen from the third direction D3. Figure 5 is a cross-sectional view taken along line A-A in Figure 3. Figure 6 is a cross-sectional view taken along line B-B in Figure 3. Figure 7 is a diagram showing the procedure of the first embodiment of the method for joining the terminal and the connection part. Figure 8 is a perspective view showing the joining structure between the terminal and the connection part. Figure 9 is a plan view of the joining structure between the terminal and the connection part as seen from above. Figure 10 is a side view of the joining structure as seen from the left side (-D1 side). Figure 11 is a plan view of the joining structure as seen from above after the first part has been deformed. Figure 12 is a diagram showing the procedure of the second embodiment of the method for joining the terminal and the connection part. Figure 13 is a diagram showing the procedure of the third embodiment of the method for joining the terminal and the connection part. Figure 14 is a cross-sectional view taken along line A-A in Figure 13. Figure 15 is a diagram showing a modified example of the joining structure. Figure 16 is a diagram showing a modified example of the joining structure.

[0013] The joining method, motor control device manufacturing method, joining structure, and motor control device according to embodiments of the present invention will be described below with reference to the drawings. Note that the scope of the present invention is not limited to the following embodiments, and modifications can be made as appropriate within the scope of the technical concept of the present invention. Furthermore, in the following drawings, the scale and number of components in each structure may differ from the actual structure in order to make the components easier to understand.

[0014] In the following description, the first direction D1 will be shown in each figure as appropriate. In this embodiment, the first direction D1 is the left-right direction of the motor control device 100. In the following description, the side to which the arrow of the first direction D1 points (+D1 side) will be referred to as the "right side". The side opposite to the side to which the arrow of the first direction D1 points (-D1 side) will be referred to as the "left side".

[0015] In the following description, the third direction D3 will be shown in each figure as appropriate. In this embodiment, the third direction D3 is the vertical direction of the motor control device 100. In the following description, the side to which the arrow of the third direction D3 points (+D3 side) will be referred to as "one side of the third direction D3" or "upper side". The side opposite to the side to which the arrow of the third direction D3 points (-D3 side) will be referred to as "the other side of the third direction D3" or "downward side".

[0016] In the following explanation, the second direction D2 will be shown in each figure as appropriate. The second direction D2 is perpendicular to both the first direction D1 and the third direction D3. The second direction D2 is the front-to-back direction of the motor control device 100. In the following explanation, the side in which the arrow of the second direction D2 points (+D2 side) will be referred to as the "front side". The side opposite to the side in which the arrow of the second direction D2 points (-D2 side) will be referred to as the "rear side".

[0017] Note that the terms "upper side," "lower side," "right side," "left side," "front side," and "rear side" are merely names used to describe the relative positional relationships of each part, and the actual arrangement may differ from those indicated by these names.

[0018] Figure 1 shows the control system of the motor control device 100. In this embodiment, the motor control device 100 has an inverter module 10. The inverter module 10 is a power conversion device. The inverter module 10 converts the DC current supplied from the external power supply 101 into AC current and supplies it to the motor M.

[0019] Motor M is, for example, a drive device mounted on a vehicle that rotates the vehicle's axle. Motor M is driven by current supplied from inverter module 10. Vehicles on which motor M is mounted are vehicles that use motor M as a power source, such as hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (PHEVs), and electric vehicles (EVs).

[0020] The inverter module 10 includes a capacitor module 20. Figure 2 is an exploded perspective view of the capacitor module 20.

[0021] The capacitor module 20 smooths the current supplied to the motor M. The capacitor module 20 comprises a case 21, a capacitor (first component) 36, a busbar (second component) 40, and insulating paper 46.

[0022] The case 21 holds the capacitor 36 and the busbar 40, respectively. The case 21 has a housing section 30 and a lid member 22. The housing section 30 is the lower part of the case 21. The housing section 30 is a roughly rectangular tube that protrudes in the third direction D3. The housing section 30 is open on the upper side.

[0023] Figure 3 is an external perspective view of the capacitor module 20. As shown in Figure 3, multiple capacitors 36 (five in Figure 3) are housed inside the housing 30 along the second direction D2. The housing 30 is made of metal. In this embodiment, the housing 30 is made of aluminum as an example.

[0024] The lid member 22 is the upper part of the case 21. In this embodiment, the lid member 22 is made of resin, for example. The lid member 22 has a cover portion 23 and two busbar fixing portions 28c and 28d.

[0025] The cover portion 23 is plate-shaped and extends in a direction perpendicular to the third direction D3. Viewed from the third direction D3, the cover portion 23 is substantially rectangular in shape, with its longer side extending in the second direction D2. The cover portion 23 is positioned above the housing portion 30. The cover portion 23 is provided with a first hole 24a, a second hole 24b, a first protruding wall 25a, a second protruding wall 25b, and a cover hole 26.

[0026] Figure 4 is a plan view of the lid member 22 as seen from the third direction D3. As shown in Figure 4, the first hole 24a is a hole that penetrates the cover portion 23 in the third direction D3. Viewed from the third direction D3, the first hole 24a is a substantially rectangular hole with its longer side extending in the second direction D2. Multiple first holes 24a (five in Figure 4) are provided at intervals along the left edge of the cover portion 23.

[0027] Figure 5 is a cross-sectional view taken along line A-A in Figure 3. As shown in Figure 5, the dimensions in the first direction D1 and the second direction D2 of the first hole 24a decrease as they move upward, and then extend upward at a constant value.

[0028] The second hole 24b is a hole that penetrates the cover portion 23 in the third direction D3. As shown in Figure 4, when viewed from the third direction D3, the second hole 24b is a substantially rectangular hole with its longer side extending in the second direction D2. Multiple second holes 24b (five in Figure 4) are provided at intervals along the right edge of the cover portion 23.

[0029] Figure 6 is a cross-sectional view taken along line B-B in Figure 3. The dimensions in the first direction D1 and the second direction D2 of the second hole 24b decrease as they move upward, and then extend upward at a constant value.

[0030] The cover hole 26 is a hole that penetrates the cover portion 23 in the third direction D3. As shown in Figure 4, when viewed from the third direction D3, the cover hole 26 is a substantially rectangular hole with its long side extending in the first direction D1. In this embodiment, the cover portion 23 is provided with five cover holes 26. Each cover hole 26 is provided spaced apart from one another along the second direction D2.

[0031] As shown in Figure 5, the first protruding wall 25a protrudes upward (towards +D1) from the cover portion 23. As shown in Figure 4, the first protruding wall 25a is a rectangular ring that surrounds the first hole portion 24a when viewed from the third direction D3. The first hole portion 24a penetrates the first protruding wall 25a upward with a constant dimension in the second direction D2.

[0032] The second protruding wall 25b projects upward (towards +D1) from the cover portion 23. When viewed from the third direction D3, the second protruding wall 25b is C-shaped and surrounds the second hole portion 24b. Of the five second protruding walls 25b, the second protruding wall 25b located furthest towards -D3 opens towards -D2. Of the five second protruding walls 25b, the four second protruding walls 25b located towards +D3 open towards +D2.

[0033] The busbar fixing portion 28c protrudes from the cover portion 23 toward the -D3 direction. When viewed from the third direction D3, the busbar fixing portion 28c is substantially rectangular in shape. The busbar fixing portion 28d protrudes from the cover portion 23 toward the left side (-D1 side). When viewed from the third direction D3, the busbar fixing portion 28d is substantially rectangular in shape. Each of the busbar fixing portions 28c and 28d is provided with a female screw hole that penetrates toward the third direction D3.

[0034] The capacitor 36 acts as a smoothing capacitor that smooths the current supplied from the external power supply 101. In this embodiment, the capacitor module 20 comprises a plurality of capacitors 36. In this embodiment, the capacitor module 20 comprises five capacitors 36. The number of capacitors 36 in the capacitor module 20 may be four or fewer, or six or more. Each capacitor 36 has a capacitor body 37 and a terminal (first conductive part) 38.

[0035] The capacitor body 37 is a roughly rectangular parallelepiped extending in the third direction D3. As shown in Figures 5 and 6, the capacitor body 37 is positioned below the cover portion 23. Each capacitor body 37 is housed in the housing portion 30. That is, the housing portion 30 houses the capacitor body 37. Each capacitor 36 is positioned along the second direction D2. The capacitor body 37 is fixed to the housing portion 30 by adhesive, for example, with an adhesive.

[0036] Terminal 38 electrically connects the capacitor body 37 and the busbar 40. As shown in Figure 2, terminal 38 extends upward from the capacitor body 37, i.e., to one side of the third direction D3 (+D1 side). Terminal 38 is conductive. Terminal 38 is, for example, a linear lead wire.

[0037] Each capacitor 36 has a plurality of terminals 38. More specifically, each capacitor 36 has two terminals 38. The plurality of terminals 38 include a first terminal 38a and a second terminal 38b. Multiple first terminals 38a and multiple second terminals 38b are provided in each capacitor 36. In this embodiment, each of the first terminals 38a and the second terminals 38b has two lead wires.

[0038] In this embodiment, the first terminal 38a is the positive terminal. The second terminal 38b is the negative terminal. The first terminal 38a may also be the negative terminal. In this case, the second terminal 38b is the positive terminal. In this embodiment, the first terminal 38a is connected to the right side (+D2 side) of the capacitor body 37. The second terminal 38b is connected to the left side (-D2 side) of the capacitor body 37.

[0039] As shown in Figure 6, each first terminal 38a is passed through the second hole 24b from below in the third direction D3. The upper end of each first terminal 38a is located above the second protruding wall 25b. As shown in Figure 5, each second terminal 38b is passed through the first hole 24a from below in the third direction D3. The upper end of each second terminal 38b is located above the first protruding wall 25a.

[0040] The busbar 40 electrically connects the multiple capacitors 36 and the motor M. The busbar 40 is a plate-shaped member. The busbar 40 is made of metal. In this embodiment, the busbar 40 is made of copper. As shown in Figure 6, the busbar 40 is positioned above the cover portion 23. When viewed from the third direction D3, the busbar 40 overlaps with the cover portion 23 in at least part.

[0041] As shown in Figure 2, the busbar 40 has a busbar body portion 40a and a connection portion 40c. In this embodiment, the capacitor module 20 includes a plurality of busbars 40. The plurality of busbars 40 include a first busbar 41 and a second busbar 44. In this embodiment, the first busbar 41 is a positive busbar. The second busbar 44 is a negative busbar. The first busbar 41 may also be a negative busbar. In this case, the second busbar 44 is a positive busbar.

[0042] The first bus bar 41 has a first main body portion 41a, a first connection portion 41d, a third terminal 41e, and a fourth terminal 41f. The first main body portion 41a is plate-shaped and extends in a direction perpendicular to the third direction D3. When viewed from the third direction D3, the first main body portion 41a is substantially rectangular with its long side extending in the second direction D2. As shown in FIGS. 5 and 6, the first main body portion 41a contacts the cover portion 23 in the third direction D3. Thereby, the cover portion 23 supports the first main body portion 41a from below. As shown in FIG. 2, a first through hole 41c is provided in the first main body portion 41a.

[0043] The first through hole 41c is a hole that penetrates the first main body portion 41a in the third direction D3. When viewed from the third direction D3, the first through hole 41c is a substantially rectangular hole. In the present embodiment, four first through holes 41c are provided in the first main body portion 41a. Each first through hole 41c is provided at the central portion of the first main body portion 41a in the first direction D1. Each first through hole 4bc is provided at intervals along the second direction D2. A second protruding wall 25b is disposed inside the first through hole 41c. A first terminal 38a is passed through the first through hole 41c in the third direction D3.

[0044] As shown in FIG. 2, the first connection portion 41d is plate-shaped and protrudes upward from the first main body portion 41a, that is, from one side (+D3 side) in the third direction D3. The first connection portion 41d is connected to the first main body portion 41a. The plate surface of the first connection portion 41d faces the first direction D1. When viewed from the first direction D1, the first connection portion 41d is substantially rectangular with its long side extending in the third direction D3. In the present embodiment, the first bus bar 41 has five first connection portions 41d.

[0045] When viewed from the third direction D3, the four first connection portions 41d located on the +D2 side are disposed at the edges of different first hole portions 24a. As shown in FIG. 6, different first terminals 38a are joined to each first connection portion 41d. That is, each first terminal 38a is joined to a different first connection portion 41d. In the present embodiment, the first terminal 38a and the first connection portion 41d are joined by welding (details will be described later).

[0046] The first bus bar 41 has a through hole 41g on the -D1 side of the first through hole 41c. A plurality (four in FIG. 2) of through holes 41g are provided at intervals in the second direction D2. The lid member 22 has projections 23a on the cover portion 23. There are four projections 23a at positions respectively facing the four through holes 41g in the third direction D3. The four projections 23a are inserted into and fitted into the four through holes 41g. By fitting the four projections 23a into the four through holes 41g respectively, the position of the first bus bar 41 relative to the cover portion 23 can be accurately determined.

[0047] The third terminal 41e is plate-shaped and protrudes from the first main body portion 41a to the left side (-D1 side). The plate surface of the third terminal 41e faces the third direction D3. The third terminal 41e is fixed to the bus bar fixing portion 28d of the lid member 22 together with a first external bus bar (not shown) electrically connected to an external power source. Thereby, the first bus bar 41 is electrically connected to the external power source 101. Also, the first bus bar 41 is fixed to the lid member 22. Thereby, the first bus bar 41 is held in the case 21.

[0048] The fourth terminal 41f is plate-shaped and protrudes from the first main body portion 41a to the right side (+D1 side). The plate surface of the fourth terminal 41f faces the third direction D3. The first bus bar 41 has three fourth terminals 41f. The respective fourth terminals 41f are arranged at intervals along the second direction D2.

[0049] The second bus bar 44 is arranged above the first main body portion 41a. As shown in FIG. 4, the second bus bar 44 has a second main body portion 44a, a second connection portion 44d, a fifth terminal 44e, and a sixth terminal 44f. The second main body portion 44a is plate-shaped and extends in a direction orthogonal to the third direction D3. When viewed from the third direction D3, the second main body portion 44a is substantially rectangular with its long side extending in the second direction D2. A second through hole 44c is provided in the second main body portion 44a.

[0050] The second through-hole 44c is a hole that penetrates the second main body portion 44a in the third direction D3. Viewed from the third direction D3, the second through-hole 44c is a substantially rectangular hole. In this embodiment, the second main body portion 44a is provided with four second through-holes 44c. Each second through-hole 44c is located in the center of the second main body portion 44a in the first direction D1. Four second through-holes 44c are provided spaced apart from each other along the second direction D2. As shown in Figures 3 and 6, the first connecting portion 41d and the first terminal 38a pass through the second through-hole 44c in the third direction D3.

[0051] As shown in Figure 2, the second connecting portion 44d is plate-shaped and protrudes upward from the second main body portion 44a, that is, to one side in the third direction D3 (+D3 side). The second connecting portion 44d connects to the second main body portion 44a. The plate surface of the second connecting portion 44d faces the first direction D1. Viewed from the first direction D1, the second connecting portion 44d is substantially rectangular in shape, with its longer side extending in the third direction D3. In this embodiment, the second busbar 44 has five second connecting portions 44d.

[0052] Viewed from the third direction D3, each second connecting portion 44d is positioned on the left edge (-D1 side) of the second main body portion 44a. As shown in Figure 5, a second terminal 38b is joined to each second connecting portion 44d. In this embodiment, the second terminal 38b and the second connecting portion 44d are joined by welding (details will be described later).

[0053] The fifth terminal 44e is plate-shaped and protrudes rearward (towards -D2) from the second main body portion 44a. The plate surface of the fifth terminal 44e faces the third direction D3. The fifth terminal 44e, together with a second external busbar (not shown) electrically connected to the external power supply 101, is fixed to the busbar fixing portion 28c of the lid member 22. As a result, the second busbar 44 is electrically connected to the external power supply. The second busbar 44 is also fixed to the lid member 22. As a result, the second busbar 44 is held in the case 21. As described above, the first busbar 41 is held in the case 21. Thus, the case 21 holds the busbar 40.

[0054] The sixth terminal 44f is plate-shaped and protrudes to the right (+D1 side) from the second main body 44a. The plate surface of the sixth terminal 44f faces the third direction D3. The second busbar 44 has three sixth terminals 44f. Each sixth terminal 44f is spaced apart from the others along the second direction D2.

[0055] The insulating paper 46 insulates the first busbar 41 and the second busbar 44. In this embodiment, the insulating paper 46 is made of, for example, kraft pulp, Manila hemp, and cotton. The insulating paper 46 has a third main body portion 46a and a projection portion 46f. The third main body portion 46a extends in a direction perpendicular to the third direction D3. Viewed from the third direction D3, the third main body portion 46a is substantially rectangular in shape, with its long side extending in the second direction D2. As shown in Figures 5 and 6, in the third direction D3, the third main body portion 46a is positioned between the first main body portion 41a and the second main body portion 44a. The third main body portion 46a insulates the first main body portion 41a and the second main body portion 44a. As shown in Figure 4, the third main body portion 46a is provided with a third through hole 46d.

[0056] The third through-hole 46d is a hole that penetrates the third main body portion 46a in the third direction D3. Viewed from the third direction D3, the third through-hole 46d is a substantially rectangular hole. In this embodiment, the third main body portion 46a is provided with four third through-holes 46d. Each third through-hole 46d is provided in the center of the third main body portion 46a in the first direction D1. Each third through-hole 46d is provided spaced apart from each other along the second direction D2. As shown in Figure 6, the first connecting portion 41d and the first terminal 38a pass through the third through-hole 46d in the third direction D3.

[0057] As shown in Figure 2, the protruding portion 46f protrudes upward from the third main body portion 46a. Viewed from the first direction D1, the protruding portion 46f is substantially rectangular in shape. In this embodiment, the insulating paper 46 has five protruding portions 46f. As shown in Figure 6, each protruding portion 46f is positioned between the first connecting portion 41d and the second main body portion 44a. As a result, the protruding portion 46f insulates the first connecting portion 41d and the second main body portion 44a.

[0058] In this embodiment, the busbar 40 has a plurality of connection portions 40c. In this embodiment, the plurality of connection portions 40c include a first connection portion 41d and a second connection portion 44d. As described above, the first connection portion 41d protrudes upward from the first main body portion 41a. The second connection portion 44d protrudes upward from the second main body portion 44a. As a result, the connection portions 40c protrude upward from the busbar main body portion 40a, that is, to one side of the third direction D3 (+D3 side). The connection portions 40c are also connected to the busbar main body portion 40a.

[0059] The above-described method for manufacturing the motor control device 100 is a method for manufacturing a motor control device 100 that controls the supply of power to a motor M via a plurality of terminals 38 of a capacitor 36 joined by welding and a connection portion 40c of a busbar 40, and includes joining the plurality of terminals 38 of the capacitor 36 and the connection portion 40c of the busbar 40 by the following joining method.

[0060] [First Embodiment of Joining Method and Joining Structure] As described above, the first terminal 38a is joined to the first connecting portion 41d. The second terminal 38b is joined to the second connecting portion 44d. Thus, the terminal 38 is joined to the connecting portion 40c. The following describes a first embodiment of the joining method between the terminal 38 and the connecting portion 40c, that is, the joining method between the first terminal 38a and the first connecting portion 41d, and the joining method between the second terminal 38b and the second connecting portion 44d.

[0061] Figure 7 shows the procedure for joining terminals 38 and connection parts 40c. As shown in Figure 7, the method for joining terminals 38 and connection parts 40c is a joining method for joining a plurality of terminals 38 and connection parts 40c, which are spaced apart in a second direction D2, in a first direction D1, and includes: attaching a cap 50 having a holding part 51 that surrounds at least a part of the periphery of an axis extending in a third direction D3 to the plurality of terminals 38 and connection parts 40c, and holding the plurality of terminals 38 and connection parts 40c together with the holding part 51 (step S1); applying an external force in the first direction D1 to the holding part 51 at a position between adjacent terminals 38 to deform it and fix each of the plurality of joining points 55 of the terminals 38 and connection parts 40c (step S2); and welding each of the plurality of joining points 55 (step S3).

[0062] Figure 8 is a perspective view showing the joining structure 60 between the terminal 38 and the connecting portion 40c. In the joining structure 60, the terminal 38 and the connecting portion 40c are joined in the first direction D1 using a cap 50. In Figure 8, the structure around the first connecting portion 41d and the first terminal 38a of the terminal 38 and connecting portion 40c is typically shown.

[0063] As shown in Figure 8, the connecting portion 40c has a projection 61, a recess 62, and a stepped portion 63. The recess 62 is located in the center of the connecting portion 40c in the second direction D2. The recess 62 is recessed downward from the upper end of the connecting portion 40c. The recess 62 penetrates the connecting portion 40c in the first direction D1.

[0064] The stepped portion 63 is provided on both sides of the connection portion 40c in the second direction D2. The stepped portion 63 is recessed downward from the upper end of the connection portion 40c. The stepped portion 63 penetrates the connection portion 40c in the first direction D1. The connection portion 40c has a recess 62 and a stepped portion 63 at its upper end, so that projections 61 are provided on both sides of the recess 62 in the second direction D2. The position of the projection 61 in the second direction D2 is opposite to the terminal 38 that extends upward from the capacitor body 37 in the first direction D1. Multiple terminals 38 (two in Figure 8) are arranged at intervals in the second direction D2. The projection 61 faces each of the two terminals 38 in the first direction D1.

[0065] Figure 9 is a plan view of the joint structure 60 between the terminal 38 and the connecting portion 40c, viewed from above. As shown in Figures 8 and 9, the cap 50 has a retaining portion 51 that surrounds at least a part of the periphery of the axis J extending in the third direction D3. The retaining portion 51 in this embodiment is a rectangular tubular shape that surrounds the periphery of the axis J all the way around and extends in the third direction D3.

[0066] The material constituting the cap 50 is not particularly limited as long as it does not interfere with the welding of the terminal 38 and the connection part 40c. As mentioned above, the lead wire and busbar are often made of copper, and considering the stability of the welding, it is preferable that the terminal 38, the connection part 40c, and the cap 50 are made of the same material. On the other hand, costs can be reduced by selecting steel, for example, as the material for the cap 50. Furthermore, in the case of steel (iron), since its melting point is higher than that of copper, the retaining part 51 is more likely to remain after welding, making it easier to maintain the joined state between the terminal 38 and the connection part 40c.

[0067] Viewed in the third direction D3, the holding portion 51 has a first portion 51A, a second portion 51B, a third portion 51C, and a fourth portion 51D. The first portion 51A and the second portion 51B extend in the second direction D2 and are spaced apart in the first direction D1. The third portion 51C and the fourth portion 51D extend in the first direction D1 and are spaced apart in the second direction D2.

[0068] The holding portion 51 is provided with a rectangular holding space 51E, as viewed from above, which is enclosed by a first portion 51A, a second portion 51B, a third portion 51C, and a fourth portion 51D. The holding space 51E penetrates the holding portion 51 in the third direction D3.

[0069] The dimension of the holding space 51E in the second direction D2 is greater than the maximum dimension in the second direction D2 of the two projections 61 that are spaced apart in the second direction D2, and less than the maximum dimension of the two stepped portions 63 that are spaced apart in the second direction D2. The dimension of the holding space 51E in the first direction D1 is greater than the sum of the maximum dimension in the first direction D1 at the terminal 38 and the maximum dimension in the first direction D1 at the connection portion 40c.

[0070] Therefore, in step S1, when the cap 50 is attached to the two terminals 38 and the connection portion 40c from above and the two terminals 38 and the connection portion 40c are inserted into the holding space 51E, as shown in Figure 9, the holding portion 51 surrounds the two terminals 38 and the connection portion 40c and holds the two terminals 38 and the connection portion 40c together.

[0071] Figure 10 is a side view of the joint structure 60 as seen from the left side (-D1 side). As shown in Figure 10, when the cap 50 is attached, the retaining portion 51 is supported by contacting the stepped portion 63 from above. As shown in Figure 8, the dimension W in the third direction D3 of the retaining portion 51 is smaller than the dimension H in the third direction from the upper end of the projection 61, which is the tip of the connecting portion 40c, to the stepped portion 63. Therefore, when the cap 50 is attached, the two terminals 38 and the upper end of the connecting portion 40c (projection 61) protrude above the retaining portion 51, making it easier to weld the two terminals 38 and the connecting portion 40c, as described later.

[0072] In step S2, an external force is applied to the first portion 51A of the holding portion 51, which is located to the left (-D1 side) of the first direction D1, at a position between two adjacent terminals 38, as shown by the white arrow in Figure 9, to the right (+D1 side), which is the other side of the first direction D1, thereby deforming the first portion 51A. The external force on the first portion 51A is applied, for example, by a crimping process.

[0073] Figure 11 is a plan view of the joint structure 60 after the first portion 51A has been deformed, as seen from above. As shown in Figure 11, when an external force is applied to the right (+D1 side) at a position facing the recess 62 in the first direction D1, a part of the first portion 51A plastically deforms to the right (+D1 side) to become a deformed portion 52 that protrudes into the recess 62. By the first portion 51A being plastically deformed by an external force applied to the right (+D1 side), the multiple joint locations 55 of the terminal 38 and the connection portion 40c can be fixed.

[0074] Furthermore, by deforming the first portion 51A on the side where the two terminals 38 with lower bending strength in the first direction D1 are located, the terminals 38 can be easily fixed to the connection portion 40c. In addition, by applying an external force to the planar first portion 51A, the terminals 38 and the connection portion 40c can maintain contact with each other while surface pressure is generated.

[0075] Furthermore, considering the plastic deformation of the first portion 51A, the thickness of the plate at the location where the deformed portion 52 occurs when an external force in the first direction is applied to the first portion 51A may be made thinner than the thickness of the plate at other locations. By adopting this configuration, the first portion 51A can be plastically deformed quickly and stably with a small external force.

[0076] In step S3, the terminals 38 and the connection portion 40c, which were fixed in step S2 under surface pressure, are each welded to multiple joint points 55. At this time, the dimension W of the holding portion 51 is smaller than the dimension H from the upper end of the projection 61 to the stepped portion 63, and the two terminals 38 and the upper ends of the connection portion 40c (projection 61) protrude above the holding portion 51, making welding easy.

[0077] The welding method is not particularly limited, but laser welding, TIG welding, resistance welding, etc., can be selected as appropriate. When using laser welding, multiple holding parts 51 can be deformed together in advance in a preceding process and then welded together. When using TIG welding or resistance welding, gripping the object to be welded is required during welding, so the holding part 51 can be deformed during gripping, which can improve the efficiency of the welding process.

[0078] As described above, in this embodiment, two terminals 38 and a connecting portion 40c are held together by a single holding portion 51, and an external force is applied to the right side (+D1 side), which is the other side of the first direction D1, at a position between two adjacent terminals 38 to deform the first portion 51A, thereby fixing multiple joining points 55 of the terminals 38 and the connecting portion 40c, and then the joining points 55 are welded. Therefore, in this embodiment, compared to the case in which the terminals 38 and the connecting portion 40c are joined and fixed under surface pressure at each joining point before welding, the two members can be efficiently positioned and joined under surface pressure at multiple points.

[0079] Furthermore, in this embodiment, the procedure involves temporarily holding and fixing the two terminals 38 and the connecting portion 40c together with the holding portion 51, and then deforming the holding portion 51 to permanently fix them. Therefore, even if the dimensions (wire diameter) of the terminals 38 change for each model, the two terminals 38 and the connecting portion 40c can be held together with the holding portion 51, thereby increasing versatility. In addition, multiple types of caps 50 with different sizes of holding space 51E depending on the dimensions (wire diameter) of the terminals 38 may be prepared.

[0080] Furthermore, in this embodiment, since the holding space 51E penetrates the holding portion 51 in the third direction D3, three-dimensional processing is unnecessary, and the cap 50 can be easily manufactured by punching with a press or the like.

[0081] Furthermore, the holding space 51E may not penetrate the holding portion 51 in the third direction D3, and there may be a lid portion above the holding portion 51 that closes off the holding space 51E. In this configuration, the molten lid portion can contribute to the welding of the terminal 38 and the connection portion 40c.

[0082] [Second Embodiment of Joining Method and Joining Structure] Next, a second embodiment of the joining method will be described with reference to Figure 12. In this figure, elements identical to those in the first embodiment shown in Figures 1 to 11 are denoted by the same reference numerals, and their descriptions are omitted.

[0083] Figure 12 shows the procedure of a second embodiment of the method for joining the terminal 38 and the connection portion 40c. As shown in Figure 12, in the joining method and joining structure 60 of this embodiment, an external force is applied to the right side (+D1 side), which is the other side of the first direction D1, of the holding portion 51 to deform the first portion 51A, causing the deformed portion 52 to protrude into the recess 62. At the same time, an external force is applied to the left side (-D1 side), which is one side of the first direction, of the second portion 51B, which is located to the right side (+D1 side), which is the other side of the first direction, of the holding portion 51B, causing the deformed portion 52A to protrude into the recess 62. The other configurations are the same as in the first embodiment described above.

[0084] In this embodiment, in addition to obtaining the same effects and advantages as in the first embodiment, by deforming both the first portion 51A and the second portion 51B in a direction that brings them closer together, it becomes possible to more firmly join and fix the two terminals 38 and the connecting portion 40c.

[0085] [Third Embodiment of Joining Method] Next, a third embodiment of the joining method will be described with reference to Figures 13 and 14. In these figures, elements identical to those in the first embodiment shown in Figures 1 to 11 are denoted by the same reference numerals, and their descriptions are omitted.

[0086] Figure 13 is a plan view showing the procedure of a third embodiment of the method for joining the terminal 38 and the connection portion 40c. Figure 14 is a cross-sectional view taken along line A-A in Figure 13. As shown in Figure 13, the holding portion 51 of this embodiment has a plate-like portion 53. The plate-like portion 53 extends from the center of the second direction D2 in the first portion 51A to the right (+D1 side). As shown in Figure 14, the plate-like portion 53 extends from the lower end of the first portion 51A through the recess 62 to the right (+D1 side). The position of the bottom surface in the recess 62 in the third direction D3 is the same as the position of the stepped portion 63 in the third direction D3. The position of the bottom surface in the recess 62 in the third direction D3 may be lower than the position of the stepped portion 63 in the third direction D3.

[0087] The plate-like portion 53 has a claw portion 54 at its right (+D1) end. The claw portion 54 protrudes upward (+D3) from the end of the plate-like portion 53. The claw portion 54 has a contact surface 58 facing the right (+D1) side of the second portion 51B. The thickness of the claw portion 54 in the second direction D2 decreases as it moves upward (+D3). The other configurations are the same as in the first embodiment described above.

[0088] When an external force in the first direction is applied to the first portion 51A of the holding portion 51 in the above configuration, causing it to deform to the right (+D1 side), the contact surface 58 of the claw portion 54 contacts the side surface of the second portion 51B of the holding portion 51 from the right (+D1 side). The contact surface 58 of the claw portion 54 contacts the side surface of the second portion 51B from the right (+D1 side), preventing the first portion 51A from moving to the left (-D1 side).

[0089] Therefore, in this embodiment, in addition to obtaining the same effects and advantages as in the first embodiment, it is possible to suppress the movement of the first portion 51A to the left side (-D1 side) due to the reaction force between the two terminals 38 and the connecting portion 40c under surface pressure, thereby preventing a decrease in surface pressure between the terminals 38 and the connecting portion 40c.

[0090] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but it goes without saying that the present invention is not limited to these examples. The shapes and combinations of the constituent members shown in the above examples are merely examples, and can be modified in various ways based on design requirements, etc., without departing from the spirit of the present invention.

[0091] In the above embodiment, the retaining portion 51 of the cap 50 is shown as surrounding the entire circumference of the axis J extending in the third direction D3, but the configuration is not limited to this. For example, a part of the retaining portion 51 may be cut out in the circumferential direction, so as to surround a part of the circumference of the axis J.

[0092] Furthermore, in the above embodiment, the holding portion 51 of the cap 50 has a linear first portion 51A, a second portion 51B, a third portion 51C, and a fourth portion 51D, and the configuration in which the first portion 51A, the second portion 51B, the third portion 51C, and the fourth portion 51D are perpendicular to each other was illustrated, but the embodiment is not limited to this configuration. For example, as shown in the modified example in Figure 15, a configuration in which an r-chamfered portion 56 may be provided at the points where the first portion 51A, to which an external force is applied, intersects with the third portion 51C and the fourth portion 51D. Also, a configuration in which an r-chamfered portion 57 may be provided at the point in the first portion 51A that becomes a deformed portion 52.

[0093] When the holding portion 51 of the above configuration is used, and an external force is applied to the right (+D1 side) at a position between two adjacent terminals 38 in the first portion 51A, thereby deforming the first portion 51A, the plastically deformed deformed portion 52 protrudes into the recess 62, as shown in the modified example in Figure 16. At this time, since the first portion 51A is provided with r-chamfered portions 56 and 57, stress concentration during deformation is mitigated. Therefore, in the modified example described above, it becomes possible to stably fix the two terminals 38 and the connecting portion 40c. In Figure 16, a configuration in which both the deformed portion 52 and the deformed portion 52A are provided is illustrated, but a configuration in which only the deformed portion 52 is provided and the deformed portion 52A is not provided is also possible.

[0094] In the above embodiment, the terminals of the capacitor's lead wires were exemplified as the first conductive part, and the busbar connection part was exemplified as the second conductive part, but the configuration is not limited to this. For example, both the first and second conductive parts may be busbar connection parts, and the busbar connection parts may be welded together.

[0095] Furthermore, although the above embodiment illustrates a configuration in which two lead wires are joined to one connection portion 40c, the configuration is not limited to this, and a configuration in which three or more lead wires are joined may also be used.

[0096] Furthermore, although the above embodiment illustrates a configuration in which the recess 62 penetrates the connecting portion 40c in the first direction D1, the configuration is not limited to this. In the case where the deformable portion 52A is not provided and only the deformable portion 52 is provided, the recess 62 may not penetrate the connecting portion 40c in the first direction D1, but rather be recessed to the right.

[0097] Furthermore, this technology can be configured as follows: (1) A joining method for joining a first conductive portion of a first member and a second conductive portion of a second member in a first direction, wherein the first member has a plurality of first conductive portions arranged at intervals in a second direction intersecting the first direction, and a cap having a holding portion that surrounds at least a part of the periphery of an axis extending in a third direction intersecting the first and second directions is attached to the plurality of first conductive portions and the second conductive portions, the holding portion holds the plurality of first conductive portions and the second conductive portions together, an external force in the first direction is applied to the holding portion at a position between adjacent first conductive portions to deform it, fixing the plurality of joining locations of the first conductive portions and the second conductive portions, and welding the plurality of joining locations. (2) The joining method according to (1), wherein a recess is provided in the holding portion at a position opposite the position where the external force is applied in the first direction to the position of the second conductive portion, and at least a part of the deformed portion that is deformed by applying the external force in the first direction to the holding portion is made to protrude into the recess. (3) The joining method according to (2), wherein the recess penetrates the second conductive portion in the first direction, and the deformation of the holding portion by applying the external force in the first direction is performed by applying the external force to the other side in the first direction to the first portion of the holding portion located on one side in the first direction to the second conductive portion, causing it to protrude into the recess, and by applying the external force to the one side in the first direction to the second portion of the holding portion located on the other side in the first direction to the second conductive portion, causing it to protrude into the recess. (4) A joining method according to any one of (1) to (3), wherein a stepped portion is provided on both sides of the second conductive portion in the second direction, sandwiching the second conductive portion, and is recessed on the other side in the third direction than the tip located on one side in the third direction of the second conductive portion, and supports the holding portion from the other side in the third direction, and the dimension of the holding portion in the third direction is smaller than the dimension of the second conductive portion in the third direction from the tip to the stepped portion. (5) A joining method according to any one of (1) to (4), wherein the material of the first conductive portion, the second conductive portion and the cap are the same. (6) A joining method according to any one of (1) to (5), wherein multiple joining locations are welded by TIG welding or resistance welding.(7) The joining method according to any one of (1) to (6), wherein the thickness of the holding portion at the position where an external force in the first direction is applied and deformed is thinner than the thickness of other parts. (8) The joining method according to any one of (1) to (7), wherein the first portion of the holding portion located on one side in the first direction from the second conductive portion has a plate-like portion extending to the other side in the first direction, and the plate-like portion has a claw portion that contacts the second portion of the holding portion located on the other side in the first direction from the other side in the first direction when the holding portion is deformed by applying the external force in the other side in the first direction from the other side in the first direction from the second conductive portion. (9) The joining method according to any one of (1) to (8), wherein the first conductive portion is a linear lead wire, and the second conductive portion is a plate-like member. (10) A method for manufacturing a motor control device that controls the supply of power to a motor via a plurality of first conductive parts of a capacitor joined by welding and a second conductive part of a busbar, the method comprising joining the plurality of first conductive parts of the capacitor and the second conductive part of the busbar by the joining method described in any one of (1) to (9). (11) A joining structure for joining a first conductive portion of a first member and a second conductive portion of a second member in a first direction, wherein the first member has a plurality of first conductive portions arranged at intervals in a second direction intersecting the first direction, and a cap having a holding portion that surrounds at least a part of the periphery of an axis extending in a third direction that intersects the first direction and the second direction, and a deformed portion that is provided when an external force in the first direction is applied to the holding portion and deforms, wherein the plurality of first conductive portions and second conductive portions are held together by the holding portion, and the plurality of joining locations of the first conductive portions and second conductive portions are welded in a fixed state by the holding portions located on both sides in the second direction, sandwiching the deformed portion that is deformed in the first direction between adjacent first conductive portions. (12) The joining structure according to (11), wherein the second conductive portion has a recess at a position facing the deformed portion in the first direction, and at least a part of the deformed portion protrudes into the recess.(13) The joint structure according to (12), wherein the recess penetrates the second conductive portion in the first direction, and the cap has a deformed portion in which a first portion of the retaining portion located on one side in the first direction from the second conductive portion is deformed to the other side in the first direction when an external force in the first direction is applied, and a second deformed portion in which a second portion of the retaining portion located on the other side in the first direction from the second conductive portion is deformed to the one side in the first direction when an external force in the first direction is applied. (14) The joint structure according to any one of (11) to (13), wherein a stepped portion is provided on both sides of the second conductive portion in the second direction, sandwiching the second conductive portion, on the other side in the third direction from the tip located on one side in the third direction of the second conductive portion, and the stepped portion supports the retaining portion from the other side in the third direction, and the dimension of the retaining portion in the third direction is smaller than the dimension of the second conductive portion from the tip to the stepped portion in the third direction. (15) The joining structure according to any one of (11) to (14), wherein the material of the first conductive part, the second conductive part, and the cap are the same. (16) The joining structure according to any one of (11) to (15), wherein the thickness of the deformed part is thinner than the thickness of other parts of the cap. (17) The joining structure according to any one of (11) to (16), wherein the first part of the holding part located on one side in the first direction from the second conductive part has a plate-like part extending to the other side in the first direction, and the plate-like part has a claw that contacts the second part of the holding part located on the other side in the first direction from the other side in the first direction when an external force in the first direction is applied to the holding part and it is deformed to the other side in the first direction. (18) The joining structure according to any one of (11) to (17), wherein the first conductive part is a linear lead wire and the second conductive part is a plate-like member. (19) A motor control device that controls the supply of power to a motor via a plurality of first conductive parts of a joined capacitor and a second conductive part of a busbar, wherein the plurality of first conductive parts of the capacitor and the second conductive part of the busbar are joined in a joining structure according to any one of (11) to (18).

[0098] 10...Inverter module, 36...Capacitor (first component), 38...Terminal (first conductive part), 40...Busbar (second component), 40c...Connection part (second conductive part), 50...Cap, 51...Holding part, 51A...First part, 51B...Second part, 52...Deformable part, 53...Plate-shaped part, 54...Claw part, 60...Joint structure, 62...Recess, 63...Stepped part, 100...Motor control device, D1...First direction, D2...Second direction, D3...Third direction, J...Axis, M...Motor

Claims

1. A joining method for joining a first conductive portion of a first member and a second conductive portion of a second member in a first direction, wherein the first member has a plurality of first conductive portions arranged at intervals in a second direction intersecting the first direction, and a cap having a holding portion surrounding at least a part of the periphery of an axis extending in a third direction intersecting the first and second directions is attached to the plurality of first conductive portions and the second conductive portions, and the plurality of first conductive portions and the second conductive portions are held together by the holding portion; an external force in the first direction is applied to the holding portion at a position between adjacent first conductive portions to deform it, thereby fixing a plurality of joining locations of the first conductive portions and the second conductive portions; and the plurality of joining locations are welded.

2. The joining method according to claim 1, wherein a recess is provided in the holding portion at a position opposite to the position where the external force is applied in the first direction to the second conductive portion, and at least a part of the deformed portion that is deformed by applying the external force in the first direction to the holding portion protrudes into the recess.

3. The joining method according to claim 2, wherein the recess penetrates the second conductive portion in the first direction, and the external force applied to the holding portion in the first direction is deformed by applying the external force to the other side in the first direction to the first portion of the holding portion located on one side in the first direction from the second conductive portion, causing it to protrude into the recess, and by applying the external force to the one side in the first direction to the second portion of the holding portion located on the other side in the first direction from the second conductive portion, causing it to protrude into the recess.

4. The joining method according to claim 1, wherein the second member is provided with stepped portions on both sides in the second direction, sandwiching the second conductive portion, which are recessed on the other side in the third direction than the tip located on one side in the third direction of the second conductive portion, and which support the holding portion from the other side in the third direction, and the dimension of the holding portion in the third direction is smaller than the dimension of the second conductive portion in the third direction from the tip to the stepped portion.

5. The joining method according to claim 1, wherein the materials of the first conductive part, the second conductive part, and the cap are the same.

6. The joining method according to claim 1, wherein each of the multiple joining points is welded by TIG welding or resistance welding.

7. The joining method according to claim 1, wherein the thickness of the holding portion at the position where an external force in the first direction is applied and deformed is thinner than the thickness of other parts.

8. The joining method according to claim 1, wherein the first portion of the holding portion located on one side in the first direction from the second conductive portion has a plate-like portion extending on the other side in the first direction, and the plate-like portion has a claw portion that contacts the second portion of the holding portion located on the other side in the first direction from the other side in the first direction when the external force is applied to the holding portion on the other side in the first direction and deformed.

9. The joining method according to claim 1, wherein the first conductive part is a linear lead wire and the second conductive part is a plate-shaped member.

10. A method for manufacturing a motor control device that controls the supply of power to a motor via a plurality of first conductive parts of a capacitor joined by welding and a second conductive part of a busbar, comprising joining the plurality of first conductive parts of the capacitor and the second conductive part of the busbar by the joining method described in any one of claims 1 to 9.

11. A joining structure for joining a first conductive portion of a first member and a second conductive portion of a second member in a first direction, wherein the first member has a plurality of first conductive portions arranged at intervals in a second direction intersecting the first direction, and is equipped with a cap having a holding portion that surrounds at least a part of the circumference of an axis extending in a third direction that intersects the first and second directions respectively, and a deformed portion that is provided when an external force in the first direction is applied to the holding portion and deforms, wherein the plurality of first conductive portions and second conductive portions are held together by the holding portion, and the plurality of joining locations of the first conductive portions and second conductive portions are welded in a fixed state by the holding portions located on both sides in the second direction, sandwiching the deformed portion that is deformed in the first direction between adjacent first conductive portions.

12. The joint structure according to claim 11, wherein the second conductive portion has a recess at a position facing the deformed portion in the first direction, and at least a part of the deformed portion protrudes into the recess.

13. The joint structure according to claim 12, wherein the recess penetrates the second conductive portion in the first direction, and the cap has a deformed portion in which a first portion of the holding portion located on one side of the second conductive portion in the first direction is deformed to the other side of the first direction when an external force in the first direction is applied, and a second deformed portion in which a second portion of the holding portion located on the other side of the first direction of the second conductive portion is deformed to one side of the first direction when an external force in the first direction is applied.

14. The joining structure according to claim 11, wherein a recessed portion is provided on both sides of the second conductive portion in the second direction, on the other side in the third direction than the tip located on one side in the third direction of the second conductive portion, and the holding portion is supported from the other side in the third direction, and the dimension of the holding portion in the third direction is smaller than the dimension of the second conductive portion in the third direction from the tip to the stepped portion.

15. The bonding structure according to claim 11, wherein the material of the first conductive part, the second conductive part, and the cap are the same.

16. The joining structure according to claim 11, wherein the thickness of the deformed portion is thinner than the thickness of other parts of the cap.

17. The joining structure according to claim 11, wherein the first portion of the holding portion located on one side in the first direction from the second conductive portion has a plate-like portion extending to the other side in the first direction, and when an external force in the first direction is applied to the holding portion and it is deformed to the other side in the first direction, the plate-like portion has a claw portion that contacts the second portion of the holding portion located on the other side in the first direction from the other side in the first direction from the other side in the first direction.

18. The joining structure according to claim 11, wherein the first conductive part is a linear lead wire and the second conductive part is a plate-shaped member.

19. A motor control device for controlling the supply of power to a motor via a plurality of first conductive parts of a joined capacitor and a second conductive part of a busbar, wherein the plurality of first conductive parts of the capacitor and the second conductive part of the busbar are joined in the joining structure according to any one of claims 11 to 18.

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