CN219917652U - Bus bar structure - Google Patents

Abstract

The utility model provides a bus bar structure capable of realizing good mechanical and electrical connectivity without complicating a connection process. A bus bar structure connected to an electronic component, comprising: a main body (10); a first bus bar (20) assembled in the main body portion and connected to the electronic component; and second bus bars (30, 40) arranged on the surface of the main body, wherein the first bus bars have connection portions (201-206) exposed on the surface (101) of the main body, the connection portions have a first base portion (202 a) surrounded by the main body and a second base portion (202 b) protruding from the first base portion, and the second bus bars are connected to the second base portion (202 b) of the connection portions.

Description

Bus bar structure

Technical Field

The present utility model relates to a bus bar structure connected to an electronic component.

Background

Patent document 1 discloses an example of a connection structure between an electronic component and a wiring member. According to patent document 1, a flat terminal having a convex portion is provided on an upper surface of an electronic component main body, and a through hole is provided at a connection portion of a wiring member. The flat terminal and the wiring member are electrically connected by inserting the convex portion of the flat terminal into the through hole of the wiring member and melting the convex portion.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2018-206550

Disclosure of Invention

Problems to be solved by the utility model

However, in the connection structure of patent document 1, since the convex portions of the flat terminals on the upper surface of the electronic component main body are inserted into the through holes of the wiring member to be fusion-connected, the connection process becomes complicated, and the resin may enter between the flat terminals and the wiring member to impair adhesion. If the adhesion is impaired, the welding strength is lowered and the resistance is increased, and good mechanical and electrical connectivity cannot be obtained.

It is therefore an object of the present utility model to provide a busbar construction which enables good mechanical and electrical connectivity without complicating the connection process.

Means for solving the problems

According to a first aspect of the present utility model, there is provided a bus bar structure for connecting to an electronic component, comprising: a main body portion; a first bus bar assembled in the main body portion and connected to the electronic component; and a second bus bar disposed on a surface of the main body, the first bus bar having a connection portion exposed on the surface of the main body, the connection portion having a first base portion surrounded by the main body and a second base portion protruding from the first base portion, the second bus bar being connected to the second base portion of the connection portion.

In a second aspect of the first aspect of the present utility model, the second base portion has a connection surface connected to the second bus bar on a surface intersecting a direction in which the second base portion protrudes from the first base portion, the connection surface being located closer to the direction in which the second base portion protrudes from the first base portion than a surface of the main body portion.

In a third aspect according to the first aspect of the present utility model, the second bus bar is closely connected to the second base portion of the connecting portion.

In a fourth aspect according to the first aspect of the present utility model, the first bus bar has a first thickness in a direction in which the second base portion protrudes, and the second bus bar has a second thickness in a direction in which the second base portion protrudes, the first thickness being thicker than the second thickness.

In a fifth aspect according to the first aspect of the present utility model, at least two or more of the first bus bars are assembled in the main body portion, one of the first bus bars is connected to at least one electronic component, the other of the first bus bars is connected to at least one other electronic component, and the second bus bar is connected to the second base portion of the respective connection portion of the one of the first bus bars and the other of the first bus bars.

In a sixth aspect according to the first to fourth aspects of the present utility model, the electronic component is a plurality of at least two or more, and the first bus bar has: a first bus bar connected to one of at least one of the electronic components; and another first bus bar connected with another one of the at least one electronic component, the second bus bar being connected with the second base of each of the one first bus bar and the another first bus bar.

In a seventh aspect according to the sixth aspect of the present utility model, the second bus bar has at least two second connecting portions connected to the connecting portions, one of the second connecting portions is connected to the second base portion of the one first bus bar, and the other of the second connecting portions is connected to the second base portion of the other first bus bar.

In an eighth aspect according to the first aspect of the present utility model, characterized in that the second base portion of the first bus bar and the second bus bar are connected by welding.

In a ninth aspect according to the first aspect of the present utility model, the main body portion is formed of a resin by insert molding in which the first bus bar is held inside.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present utility model, good mechanical and electrical connectivity can be achieved without complicating the connection process.

Drawings

Fig. 1 is an exploded perspective view of a sensor unit employing a bus bar structure according to an embodiment of the present utility model.

Fig. 2 is a perspective view showing the structure of an embedded bus bar assembled in the main body portion of the bus bar structure of the present embodiment.

Fig. 3 is a perspective view of the embedded bus bar shown in fig. 2 with a sensor connected thereto.

Fig. 4 is a top view of the embedded bus bar shown in fig. 2 and a bridging bus bar connected to the embedded bus bar.

Fig. 5 is a plan view showing correspondence between the connection portion of the body portion surface to which the embedded bus bar shown in fig. 2 is assembled and the connection portion of the bridging bus bar.

Fig. 6 is an enlarged plan view of the connection portion in the bus bar structure of the present embodiment.

Fig. 7 is a sectional view taken along line A-A of the connection portion shown in fig. 6.

Fig. 8 is a B-B sectional view of the connection portion shown in fig. 6.

Fig. 9 is a cross-sectional view of the connection portion shown in fig. 8 illustrating a welded portion.

Fig. 10 is a perspective view of a sensor unit employing the bus bar structure of the present embodiment.

Fig. 11 is an exploded perspective view of a final sensor unit in which a cover is attached to a sensor unit employing the bus bar structure of the present embodiment.

In the figure:

1-a busbar structure; 10-a main body; 101-surface; 102-a peripheral wall portion; 103-107—an opening; 108. 109—positioning projections; 110-a movement suppressing portion; 111-a bracket; 112-an electrode lead frame body; 20-an embedded bus bar (first bus bar); 201-206—a connection portion; 205 A-A first base; 205 b-a second base (protrusion); 210-connection point for output; 211—a connection point for ground; 212-connection point for power supply; 220-224-bus bars; 225-229-output lead terminals; 230-232 bus bars; 235-a lead terminal for grounding; 240-242-bus bars; 245-a power supply lead terminal; S1-S5-sensor electrode parts; 30—a bridging busbar (second busbar); 301-303-a second connection portion; 310. 311, 313—extensions; 312—a bend; 314—a through hole; 320-323-front end protrusions; 40-bridging bus bar (second bus bar); 401 to 403-second connection portions; 410-414—extensions; 415-a through hole; 420-422-front end protruding part; 50—sensors (electronic components); 501-an output terminal; 502-a ground terminal; 503-power supply terminals.

Detailed Description

Hereinafter, embodiments of the present utility model will be described in detail with reference to fig. 1 to 11. However, the constituent elements described in the following embodiments are merely examples, and are not intended to limit the technical scope of the present utility model.

In fig. 1 to 11, for convenience of explanation, three axes orthogonal to each other are set as an X axis, a Y axis, and a Z axis. Here, as an example, the XY plane is a horizontal plane, and the Z axis is a vertical direction orthogonal to the horizontal plane. However, in the present specification, the vertical direction, the horizontal direction, the upper side, the lower side, the X/Y/Z axis direction, the positive direction and the negative direction of each axis direction are only simple names for explaining the relative positional relationship of each part. The actual arrangement relationship may be an arrangement relationship other than the arrangement relationship shown by the name.

1. Main body structure

As illustrated in fig. 1, a bus bar structure 1 according to an embodiment of the present utility model includes a main body 10, an embedded bus bar 20 as a first bus bar, and bridge bus bars 30 and 40 as second bus bars. The main body 10 is made of an insulating material such as resin, and the embedded bus bar 20 is assembled therein. The main body 10 has a surface 101 (here, in the XY plane direction), and a peripheral wall 102 is formed around the surface 101. As described later, the openings 103 to 107, the positioning protrusions 108 and 109, and the movement suppressing portion 110 are provided on the surface 101 of the main body portion 10, and the connection portions 201 to 206 of the embedded bus bar 20 are exposed. The bridge bus bars 30 and 40 are disposed on the surface 101 of the main body 10, and are connected to connection portions 201 to 206 of the embedded bus bar 20 as described later.

The openings 103 to 107 penetrate the main body 10 in the Z-axis direction to form an electronic component housing, and electronic component connection electrodes of the embedded bus bar 20 described later are exposed. The positioning protrusions 108 and 109 have a positioning function when the bridging bus bars 30 and 40 are arranged, respectively. The movement suppressing portion 110 has a function of suppressing movement of the bridge bus bars 30 and 40 in the direction of the surface 101. The bridge bus bar 30 is connected to the connection portions 201 to 203, and the bridge bus bar 40 is connected to the connection portions 204 to 206. The bridging bus bars 30 and 40 will be described later (fig. 4 and 5).

The main body 10 includes a bracket 111 and an electrode lead frame 112, and a lead terminal of an embedded bus bar 20 described later is accommodated in the electrode lead frame 112.

2. Embedded bus bar (first bus bar) < structure of bus bar >

As illustrated in fig. 2 to 4, the embedded bus bar 20 is made of a conductive material such as metal, and is assembled and fixed in the main body 10. As described in detail below, the embedded bus bar 20 is constituted by a plurality of bus bars. One of the bus bars included in the embedded bus bar 20 is connected to at least one electronic component, and the other bus bar is connected to other electronic components. In addition, another bus bar included in the embedded bus bar 20 is connected to the connection portion of at least one electronic component and the bridge bus bar 30 or 40.

Hereinafter, as the electronic component, the sensor 50 is exemplified, and the sensor 50 has an output terminal 501 (shown by O), a ground terminal 502 (shown by G), and a power supply terminal 503 (shown by P). As shown in fig. 3, five sensors 50 (1) to 50 (5) are connected to the embedded bus bar 20.

In fig. 2, the embedded bus bar 20 has sensor electrode portions S1 to S5, and is connected to the sensors 50 (1) to 50 (5), respectively. The output terminal 501, the ground terminal 502, and the power supply terminal 503 of the sensor 50 are identical in terminal arrangement. In the sensor electrode section S1, the output terminal 501 of the sensor 50 (1) is connected to the output connection point 210 (1), the ground terminal 502 is connected to the ground connection point 211 (1), and the power supply terminal 503 is connected to the power supply connection point 212 (1). The same applies to the sensor electrode portions S2 to S5. In the sensor electrode portion Sx (x is an integer of 1 to 5), the output terminal 501 of the sensor 50 (x) is connected to the output connection point 210 (x), the ground terminal 502 is connected to the ground connection point 211 (x), and the power supply terminal 503 is connected to the power supply connection point 212 (x).

Output connection points 210 (1) to 210 (5) of the sensor electrode portions S1 to S5 are connected to output lead terminals 225 to 229 via individual bus bars 220 to 224, respectively. Therefore, the output signals of the respective sensors can be extracted from the output lead terminals 225 to 229, respectively.

The connection point 211 (1) for grounding of the sensor electrode portion S1 is connected to the connection point 211 (5) for grounding of the sensor electrode portion S5 via the bus bar 230, and the bus bar 230 is connected to the connection portion 203. The power supply connection point 212 (1) of the sensor electrode portion S1 is connected to the power supply connection points 212 (4) and 212 (5) of the sensor electrode portions S4 and S5 via the bus bar 240, and the bus bar 240 is connected to the connection portion 206.

The connection point 211 (2) for grounding of the sensor electrode portion S2 is connected to the connection point 211 (3) for grounding of the sensor electrode portion S3 via a bus bar 232, and the bus bar 232 is connected to the connection portion 201. The power supply connection point 212 (2) of the sensor electrode portion S2 is connected to the connection portion 205 via the bus bar 241.

The connection point 211 (4) for grounding of the sensor electrode portion S4 is connected to the lead terminal 235 for grounding via the bus bar 231, and the bus bar 231 is connected to the connection portion 202.

As described above, the connection portion 201 is connected to the connection points 211 (2) and 211 (3) for grounding of the sensor electrode portions S2 and S3, the connection portion 202 is connected to the connection point 211 (4) for grounding of the sensor electrode portion S4, and is connected to the lead terminal 235 for grounding, and the connection portion 203 is connected to the connection points 211 (1) and 211 (5) for grounding of the sensor electrode portions S1 and S5. That is, the connection portions 201 to 203 are connection portions for common ground.

On the other hand, the connection portion 204 is connected to the power supply connection point 212 (3) of the sensor electrode portion S3, and is connected to the power supply lead terminal 245, the connection portion 205 is connected to the power supply connection point 212 (2) of the sensor electrode portion S2, and the connection portion 206 is connected to the power supply connection points 212 (1), 212 (4), and 212 (5) of the sensor electrode portions S1, S4, and S5. That is, the connection portions 204 to 206 are connection portions for a common power source.

Therefore, as shown in fig. 1 and 4, by connecting the bridge bus bar 30 to the connection portions 201 to 203, all the connection points for grounding of the sensor electrode portions can be connected to the lead terminal 235 for grounding. Further, by connecting the bridge bus bar 40 to the connection portions 204 to 206, all the power supply connection points of the sensor electrode portions can be connected to the power supply lead terminal 245. However, the number and arrangement of the connection portions for the common ground and the common power supply are not limited to the above number and arrangement, as long as the most reasonable number and arrangement are provided in consideration of the number and arrangement of the sensors and the electrode structure of each sensor.

Structure of connecting part

The shape of the connection portion 205 is shown as an example in fig. 2. The connection portion 205 has a first base portion 205a and a second base portion 205b protruding from a central portion thereof. As will be described later, the periphery of the first base 205a is surrounded by the insulating material of the main body 10, and the upper surface in the Z-axis direction is exposed to the surface 101 of the main body 10. Since the second base 205b protrudes in the Z-axis direction from the surface of the first base 205a, a connection surface intersecting the direction in which the second base 205b protrudes (Z-axis direction) is located at a position protruding from the surface 101 of the main body 10. As will be described later, the protruding connection surface of the second base 205b is engaged with the connection portions of the bridging bus bars 30 and 40. The connection portion 205 in fig. 2 is rectangular, but is not limited thereto.

As shown in fig. 4, the connection portions 201 to 206 basically have the same configuration as the connection portion 205 described above. That is, each connecting portion has the first base portion and a second base portion protruding in the Z-axis direction of the first base portion. Hereinafter, the first base portion of each connecting portion is denoted by the reference numeral "a", and the second base portion is denoted by the reference numeral "b". Specifically, the connection portion 201 is constituted by a first base portion 201a and a second base portion 201b, and the connection portion 202 is constituted by a first base portion 202a and a second base portion 202b, and the same applies to the following.

3. Bridging busbar (second busbar)

The bridge bus bar (second bus bar) in the present embodiment has a plurality of second connection portions and at least one extension portion, and the number and arrangement of the plurality of second connection portions correspond to the number and arrangement of connection portions of the embedded bus bar 20 exposed on the surface 101 of the main body portion 10, respectively.

The bridge bus bar 30 in the present embodiment has second connection portions 301 to 303. The shape and arrangement of the extension portions 310, 311, and 313 and the bent portion 312 are designed such that the second connection portions 301 to 303 are in a positional relationship to be engaged with the connection portions 201, 202, and 203 of the embedded bus bar 20, respectively. As an example, the extension portion 310 and the extension portion 311 extending in the X-axis direction are connected via a bending portion 312 for position adjustment in the Y-axis direction. The tip protruding portion 320 of the extension portion 310 protrudes in the X-axis direction, and the second connecting portion 301 is provided at a tip portion that is away from the tip protruding portion 320 in the positive direction of the X-axis direction.

Further, an extension portion 313 is connected in parallel to the extension portion 311 extending in the X-axis direction, and a through hole 314 is formed between the extension portion 311 and the extension portion 313. In the present embodiment, the through-hole 314 has a rectangular shape having a long side in the X-axis direction, but is not limited thereto. In addition, the through hole 314 has a shape similar to the planar shape of the positioning protrusion 108 provided on the surface 101 of the main body portion 10. However, the rectangular shape may be any shape having a positioning function, and the longitudinal direction of the rectangle is not limited to the X-axis direction.

In addition, at a portion of the extension 311 connected to the bent portion 312, a second connection portion 302 and a tip protruding portion 321 are provided in the negative direction of the Y-axis direction. The second connection portion 303 is provided at an end portion of the extension portion 311 opposite to the bending portion 312, and distal end protruding portions 322 and 323 are provided in the Y-axis direction from the second connection portion 303.

The bridging busbar 30 is positioned by penetrating the positioning protrusion 108 on the surface 101 through the through-hole 314, and the front-end protrusion 320 is restrained from moving in the direction of the surface 101 by the movement restraining part 110 on the surface 101. By positioning in this manner, the second connection portions 301 to 303 of the bridge bus bar 30 can be overlapped with the connection portions 201 to 203 of the embedded bus bar 20 exposed on the surface 101, respectively, and the second connection portions 301 to 303 can be joined by a joining method such as welding without deviating from the connection portions 201 to 203. More specifically, the second connection portions 301 to 303 of the bridge bus bar 30 are overlapped and joined with the protruding second base portions 201b, 202b, and 203b of the connection portions 201 to 203, respectively.

The bridge bus bar 40 in the present embodiment has second connection portions 401 to 403. The shape and arrangement of the extension portions 410 to 413 are designed such that the second connection portions 401 to 403 are in a positional relationship to be engaged with the connection portions 204, 205, and 206 of the embedded bus bar 20, respectively. As an example, the extension portion 410 and the extension portion 411 extending in the negative direction of the X-axis direction are connected via the extension portion 412 for position adjustment in the Y-axis direction. The distal end protruding portion 420 of the extending portion 410 protrudes in the X-axis direction, and the second connecting portion 401 is provided at a distal end portion that is away from the distal end protruding portion 420 in the positive direction in the X-axis direction. The front end protruding portion 421 of the extending portion 411 protrudes in the negative direction of the Y-axis direction, and the second connecting portion 402 is provided at an end portion separated from the front end protruding portion 421 in the positive direction of the Y-axis direction.

Further, an extension portion 414 is connected in parallel to the extension portion 412 extending in the Y-axis direction, and a through hole 415 is formed between the extension portion 412 and the extension portion 414. In the present embodiment, the through-hole 415 has a rectangular shape having a long side in the Y-axis direction, but is not limited thereto. In addition, the through hole 415 has a shape similar to the planar shape of the positioning protrusion 109 provided on the surface 101 of the main body portion 10. However, the rectangular shape may be any shape having a positioning function, and the longitudinal direction of the rectangle is not limited to the Y-axis direction.

Further, an extension 413 extending in the positive direction of the X-axis direction is connected to a portion of the extension 412 extending in the Y-axis direction, a tip protruding portion 422 of the extension 413 protrudes in the X-axis direction, and a second connection portion 403 is provided at a tip portion separated from the tip protruding portion 422 in the negative direction of the X-axis direction.

The bridging busbar 40 is positioned by penetrating the positioning projection 109 on the surface 101 through the through-hole 415, and the front-end projection 421 is restrained from moving in the direction of the surface 101 by the movement restraining portion 110 on the surface 101. Thereby, the second connection portions 401 to 403 of the bridge bus bar 40 are respectively joined to the connection portions 204 to 206 of the embedded bus bar 20 exposed on the surface 101. More specifically, the second connection portions 401 to 403 are overlapped and joined with the protruding second base portions 204b, 205b, and 206b of the connection portions 204 to 205, respectively.

4. Structure of connecting part

As illustrated in fig. 2, the connection portions 201 to 206 exposed on the surface 101 of the main body 10 include first base portions 201a to 206a and second base portions 201b to 206b protruding from the central portions thereof, respectively. The connection structure between the second connection portions of the bridge bus bars 30 and 40 and the connection portion of the embedded bus bar 20 exposed on the surface 101 will be described below with reference to fig. 6 to 9. The connection structure between the connection portion 202 and the second connection portion 302 will be described as an example, but other connection portions have the same structure.

As shown in fig. 6 in an enlarged manner, the connection portion 202 exposed on the surface 101 of the main body portion 10 has the first base portion 202a and the second base portion 202b protruding from the central portion thereof as described above. If the second connecting portion 302 of the bridging busbar 30 is disposed above the connecting portion 202 in the Z-axis direction, the second connecting portion 302 is in close contact engagement with the protruding second base portion 202b of the connecting portion 202. Hereinafter, fig. 7 to 9 are cross-sectional views of the connection portion. The Z-axis direction is the up-down direction, the height direction, or the thickness direction.

In fig. 7, the body 10 is made of an insulating material such as resin, and the bus bars 220 and 231 of the embedded bus bar 20 are assembled by insert molding, for example. The first base 202a of the connection portion 202 of the embedded bus bar 20 is exposed on the surface 101 of the main body portion 10, and is formed such that the upper surface of the first base 202a is flush with the surface 101. Therefore, the second base 202b protrudes from the surface 101 by a height d, and a surface of the second base 202b intersecting the Z-axis direction, that is, a connection surface, is located higher than the surface 101 by the height d. The forming method of the protruding second base 202b is not limited. For example, the protruding portion serving as the second base 202b can be formed by pressing (press working or the like) the center portion of the metal plate having the thickness D1 serving as the first base 202 a.

When the second connection portion 302 of the bridge bus bar 30 is disposed on the connection portion 202 of the embedded bus bar 20, the second connection portion 302 is brought into contact with the upper surface of the second base portion 202b, and in this state, as shown in fig. 9, laser welding 601 is performed, whereby the connection portion 202 and the second connection portion 302 can be bonded in close contact. At this time, since the second base 202b protrudes from the surface 101, it is possible to prevent resin from entering the joint portion of the second base 202b and the second connecting portion 302 when insert molding of the main body portion 10 is performed. This can prevent the strength of the welded portion from being lowered and unstable due to the spread of the resin to the welded portion, and can improve the reliability of the mechanical and electrical connection.

In addition, as shown in fig. 7, it is preferable that the thickness D1 of the first base 202a in the connection portion 202 of the embedded bus bar 20 is thicker than the thickness D2 of the second connection portion 302 of the bridging bus bar 30. As a result, as shown in fig. 9, the influence on the connection portion 202 of the embedded bus bar 20, which is the lower bus bar, can be avoided when performing laser welding.

The connection surface, which is a surface of the second base 202b intersecting the Z-axis direction, is located higher than the surface 101 by a height d, and is connected to the second connection portion 302 of the bridge bus bar 30 via the protruding connection surface. Since the connection is made through the surface in this way, there is an advantage that the connection strength is high and the resistance is small as compared with the connection through the point. In particular, according to the present embodiment, the protruding connection surface of the second base 202b is in surface contact with the second connection portion 302 of the bridge bus bar 30, so that the connection strength and electrical connectivity are improved.

5. Sensor module

As shown in fig. 10, by disposing and joining the bridge bus bars 30 and 40, the connection portions 201 to 203 exposed at the surface 101 of the main body portion 10 are commonly grounded via the bridge bus bar 30, and the connection portions 204 to 206 are commonly electrically connected via the bridge bus bar 40. In the case of a sensor module having the sensors 50 (1) to 50 (5) as electronic components, as shown in fig. 2 and 3, the sensors 50 (1) to 50 (5) are connected to the respective sensor electrode portions S1 to S5 from below the bus bar structure 1. The electrode connection can be easily performed through the openings 103 to 107. Finally, as shown in fig. 11, the protective cover 11 is fixed to the inside of the peripheral wall 102 of the main body 10, whereby a sensor module can be obtained.

In the case of the sensor module, as shown in fig. 2 and 3, by connecting the ground lead terminal 235 and the power supply lead terminal 245 to a power supply, it is possible to operate all the sensors and take out the sensor outputs from the output lead terminals 225 to 229. Therefore, by adopting the bus bar structure 1 of the present embodiment, a sensor module composed of N (N is an integer of 2 or more) sensors can be driven with a small number of lead terminals (n+2).

In such a sensor module, since the drive current of all the sensors flows through the power supply lead terminal 245 and the ground lead terminal 235, if adhesion of the bus bar connection portion is deteriorated and resistance value is increased due to the entry of resin or the like, heat generation or the like occurs. The bus bar structure 1 according to the present embodiment can prevent insufficient welding strength and can prevent heat generation due to insufficient adhesion.

Industrial applicability

The present utility model can be applied to a bus bar connection portion of a bus bar structure.

Claims (9)

1. A bus bar structure connected to an electronic component, comprising:

a main body portion;

a first bus bar assembled in the main body portion and connected to the electronic component; and

a second bus bar arranged on the surface of the main body,

the first bus bar has a connecting portion exposed at a surface of the main body portion,

the connecting portion has a first base portion surrounded by the main body portion and a second base portion protruding from the first base portion,

the second bus bar is connected with the second base portion of the connecting portion.

2. The bus bar structure as set forth in claim 1, wherein,

the second base portion has a connection surface to be connected to the second bus bar on a surface intersecting a direction in which the second base portion protrudes from the first base portion,

the connection surface is located in a direction protruding from the first base portion closer to the second base portion than the surface of the main body portion.

3. The bus bar structure as set forth in claim 1, wherein,

the second bus bar is tightly connected with the second base part of the connecting part.

4. The bus bar structure as set forth in claim 1, wherein,

the first bus bar has a first thickness in a direction in which the second base portion protrudes,

the second bus bar has a second thickness in a direction in which the second base portion protrudes,

the first thickness is thicker than the second thickness.

5. The bus bar structure as set forth in claim 1, wherein,

at least two or more of the first bus bars are assembled in the main body portion,

one of the first bus bars is connected with at least one electronic component,

the other of said first bus bars is connected to at least one other electronic component,

the second bus bar is connected to the second base portion of the connection portion of each of the one of the first bus bars and the other of the first bus bars.

6. The bus bar structure as set forth in any one of claims 1 to 4, wherein,

the electronic component is a plurality of at least two or more,

the first bus bar has:

a first bus bar connected to one of at least one of the electronic components; and

another first bus bar connected to another one of at least one of the electronic components,

the second bus bar is connected to the second base portion of each of the one first bus bar and the other first bus bar.

7. The bus bar structure as set forth in claim 6, wherein,

the second bus bar has at least two second connection portions connected with the connection portions,

one of the second connection portions is connected with the second base portion of the one first bus bar,

the other of the second connection portions is connected to the second base portion of the other first bus bar.

8. The bus bar structure as set forth in claim 1, wherein,

the second base portion of the first bus bar and the second bus bar are connected by welding.

9. The bus bar structure as set forth in claim 1, wherein,

the main body portion is formed of resin by insert molding that holds the first bus bar inside.