JP7327290B2 - Busbar joining method and busbar joining structure - Google Patents

Description

The present invention relates to a busbar joining method and a busbar joining structure.

Conventionally, terminals are electrically connected using a bus bar made of highly conductive metal. In order to allow a large current to flow through such a bus bar, it is necessary to increase the cross-sectional area of the bus bar. When the cross-sectional area of the busbar is increased, the rigidity of the busbar is increased and the busbar is less likely to deform. As a result, when the terminals to which the busbars are connected are misaligned, it is difficult to deform the busbars in accordance with the misalignment of the terminals, resulting in poor usability. On the other hand, the configuration disclosed in Patent Document 1 discloses a configuration of a bus bar in which a plurality of thin metal plates are superimposed and the end portions of the plurality of thin plates are collectively fastened to a terminal block with through bolts. It is According to this configuration, the intermediate portion of the busbar is formed by simply superimposing a plurality of thin plates, so that the intermediate portion can be easily changed. Therefore, even when the terminals to which the busbars are connected are misaligned, the intermediate portions of the busbars are deformed to absorb the misalignment of the terminals, thereby improving the assemblability of the busbars.

JP 2010-016945 A

However, in the configuration disclosed in Patent Literature 1, the end portions of the overlapping thin plates are collectively bolted to the terminal block. Therefore, the joints between the thin plates and the joints between the thin plate and the bolt are a set of points that are in point contact when viewed in detail, and if the bolt tightening torque is loose, the joint area at the joint is sufficiently secured. It becomes difficult for current to flow. In addition, when an oxide film is formed on the surfaces of the thin plates, current flow may be hindered both at the joints between the thin plates and at the joints between the thin plates and the bolt. As a result, the energization quality of the busbar may deteriorate.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a bus bar joining method that is easy to assemble and that exhibits high current quality.

One aspect of the present invention is a busbar joining method for joining a busbar to a plurality of terminals, comprising:
an integration step of forming a busbar by integrating the plurality of metal plates by overlapping a plurality of metal plates and joining portions of each of the plurality of metal plates to form a busbar joint portion; ,
In a state in which the bus bar is applied to the plurality of terminals along the overlapping direction of the plurality of metal plates, the bus bar is pressed against the terminal in order from the terminal closest to the bus bar joint portion among the plurality of terminals. a terminal joining step of joining the plurality of metal plates and the terminals to each other by welding or welding to form a terminal joint portion;
in a busbar joining method including

Another aspect of the present invention is a bus bar joint structure in which a plurality of terminals are joined to a bus bar formed by overlapping a plurality of metal plates,
a busbar joint portion formed by joining the plurality of metal plates to each other;
a terminal joint portion in which the plurality of metal plates and the plurality of terminals are joined to each other by welding or welding;
The busbar joint structure has a busbar joint structure in which the busbar joint portion is provided at a position different from that of the terminal joint portion in the direction in which the plurality of terminals are arranged.

According to the busbar joining method of the above aspect, in the busbars formed in the integration step, the metal plates are not joined to each other and are overlapped at portions other than the busbar joining portion where the plurality of metal plates are joined to each other. It is in a state of being alone. In the terminal joining process, the busbars are pressed against the terminals in order from the terminal closest to the busbar joining portion, so that if there is a deviation in the height position of the terminal, each metal plate will not be misaligned. Together, they can be relatively freely transformed individually. Therefore, the bus bar can be easily deformed in accordance with the misalignment of the terminals, and the assembly is excellent. Since each metal plate can be relatively freely deformed individually according to the positional displacement of the terminals, the occurrence of wrinkles and sagging in the middle portion between the terminal joint portions of the bus bar is suppressed. In addition, in the terminal joining process, multiple metal plates and terminals are joined together by welding or welding, so compared to the case of bolt fastening, a sufficient joint area between the multiple metal plates and terminals is ensured, allowing current flow. easier to flow. Furthermore, since the terminal joint portion is formed by welding or welding, even if an oxide film is formed on the surface of the metal plate, it is possible to suppress the obstruction of current flow. By these, the improvement of the electricity supply quality of a bus bar can be aimed at.

According to the busbar joint structure of the other aspect, the busbar joint portion where the plurality of metal plates are joined to each other is provided at a position different from the terminal joint portion where the terminals are joined in the direction in which the plurality of terminals are arranged. ing. Therefore, in the parts of the busbar where the terminal joints are not formed, the metal plates are not joined to each other but are simply superimposed on each other, except for the busbar joints. The metal plates can be individually deformed relatively freely. Therefore, the bus bar can be easily deformed in accordance with the misalignment of the terminals, and the assembly is excellent. In addition, since each metal plate can be relatively freely and individually deformed according to the positional displacement of the terminals, the occurrence of wrinkles and sagging in the middle portion between the terminal joint portions of the bus bar is suppressed. Moreover, since the plurality of metal plates and the terminals are joined to each other by welding or adhesion, a sufficient joint area between the plurality of metal plates and the terminals is ensured compared to the case of bolting, and current flows easily. Furthermore, since the terminal joint portion is formed by welding or welding, even if an oxide film is formed on the surface of the metal plate, it is possible to suppress the obstruction of current flow. By these, the improvement of the electricity supply quality of a bus bar can be aimed at.

As described above, according to the above-described aspect, it is possible to provide a busbar joining method that exhibits good assembling properties and high electrical quality.

FIG. 4 is a cross-sectional view showing a connection state of the bus bar to the terminals in the first embodiment; (a) to (d) are conceptual diagrams for explaining a busbar joining method in Embodiment 1. FIG. (a) to (d) are other conceptual diagrams for explaining the busbar joining method in the first embodiment. (a) to (d) are conceptual diagrams for explaining a busbar joining method in Embodiment 2. FIG. (a) to (d) are other conceptual diagrams for explaining the busbar joining method in the second embodiment. FIG. 10 is a top view of the bus bar in (a) Modified Mode 1, (b) Modified Mode 2, (c) Modified Mode 3, and (d) Modified Mode 4; (a) to (d) are conceptual diagrams for explaining a bus bar joining method in Embodiment 3. FIG.

Preferably, in the integration step, the busbar joints are formed by welding, welding or brazing. In this case, the metal plates are firmly bonded to each other at the busbar joints compared to the case where screws are used, so the contact resistance between the metal plates can be reduced, and the quality of current flow can be improved. can be done.

In the integration step, the plurality of metal plates can be integrated at the busbar joint portion, and the busbar and one of the plurality of terminals can be joined. In this case, the bonding for integrating the plurality of metal plates and the bonding for bonding the bus bar and one terminal can be performed at the same time, and the number of working steps can be reduced.

It is preferable that three or more terminals are provided. When three or more terminals are provided, the terminals are likely to be misaligned with each other. However, by the bus bar bonding method described above, the bus bars can be easily deformed according to the misalignment of the terminals, and the bus bar and the terminals can be connected. It is possible to suppress the occurrence of a gap between them, and it is possible to improve the assemblability and the energization quality.

(Embodiment 1)
An embodiment of the busbar joining method will be described with reference to FIGS. 1 to 3. FIG.
The busbar bonding method of the present embodiment is a method of bonding the busbar 10 to a plurality of terminals 31 to 34, and includes an integration step S1 shown in FIGS. and a terminal bonding step S2 shown in FIG. 3(d).
In the integration step S1 shown in FIG. 2, as shown in FIGS. 2(a) and 2(b), a plurality of metal plates 11 to 15 are overlapped and a part of each of the plurality of metal plates 11 to 15 is By joining the metal plates 11 to 15 together to form the busbar joint 20, the busbar 10 is formed by integrating the plurality of metal plates 11 to 15 as shown in FIGS. 2(c) and 2(d).
After that, in the terminal bonding step S2, as shown in FIG. 3A, the plurality of terminals 31 to 34 are joined while the bus bar 10 is placed against the terminals 31 to 34 along the direction in which the plurality of metal plates 11 to 15 are stacked. The plurality of metal plates 11 to 15 and the terminals 31 to 34 are welded or welded to each other while pressing the busbar 10 against the terminals 31 to 34 in order from the one closest to the busbar joint 20 to form the terminal joint. Form 21-24.
Then, the busbar joint structure 1 shown in FIG. 1 is formed by the busbar joint method of the present embodiment.

Hereinafter, the busbar joining method and the busbar joining structure 1 of this embodiment will be described in detail.
In the above-described busbar joint structure 1 shown in FIG. 1, the busbar 10 is composed of a plurality of metal plates 11-15. In this embodiment, the longitudinal direction of the bus bar 10 is defined as the width direction X, the width direction of the bus bar 10 is defined as the depth direction Y, and the stacking direction of the metal plates 11 to 15 in the bus bar 10 is defined as the thickness direction Z. In this embodiment, as shown in FIGS. 2(a) and 2(b), the material of the metal plates 11 to 15 constituting the bus bar 10 is not particularly limited, and may be copper, copper alloy, aluminum, aluminum alloy, or the like. A known material used as a busbar can be used.

As shown in FIGS. 2(c) and 2(d), the metal plates 11 to 15 are all elongated thin plates and have the same shape. The number of metal plates 11 to 15 is such that the total thickness of the metal plates 11 to 15 can be set according to the magnitude of the current flowing through the bus bar 10, and each metal plate 11 to 15 can be easily deformed. It can be set to be about the thickness. For example, the thickness of each metal plate 11-15 can be 0.05-2.0 mm, and 2-150 metal plates can be used. In this embodiment, five metal plates with a thickness of 1.0 mm are used.

As shown in FIG. 1, the metal plates 11 to 15 are joined to each other at busbar joints 20 . The joining method at the busbar joint 20 can be welding, welding or brazing. Examples of welding include laser welding, TIG welding, and MIG welding. Examples of welding include friction stir welding, high frequency welding, and ultrasonic welding. In the brazing welding, a known brazing material suitable for the material of the metal plates 11 to 15 as base materials can be used. In this embodiment, the busbar joint 20 is formed by laser welding.

The busbar joint portion 20 is provided in the busbar 10 at a different position from the terminal joint portions 21 to 24 described later. In other words, the busbar joint portion 20 includes the end portion of the busbar 10 in the direction in which the terminals 31 to 34 are arranged and the terminal joint portion 21 (24) closest to the end portion, or the adjacent terminal joint portions 21 to 21 (24). 24 can be provided in the intermediate portions 16-18. The busbar junction 20 is preferably provided in one of these areas. In this embodiment, as shown in FIG. 1, the busbar joint portion 20 is positioned closest to one end portion 10a of the busbar 10 and the end portion 10a in the width direction X, which is the direction in which the terminals 31 to 34 are arranged. It is provided in a region between the terminal joint portion 21 .

In this embodiment, as shown in FIG. 2B, the entire one end (one end 10a of the busbar 10) of the metal plates 11 to 15 in the width direction X is laser-welded to form a busbar joint. 20 are formed. The busbar joint 20 may be formed by performing a single weld, or by performing multiple welds in the region between the end 10a and the terminal joint 21 shown in FIG. may be formed by providing The busbar 10 is formed by fixing and integrating the metal plates 11 to 15 by the busbar joint portion 20 so as not to shift with each other. Before the bus bar 10 is connected to the terminals 31 to 34, the metal plates 11 to 15 are not joined at the portions other than the bus bar joining portion 20. FIG. As a result, before the bus bar 10 is connected to the terminals 31 to 34, the end portion 10a on the side where the bus bar joint portion 20 is formed serves as a fixed end where the metal plates 11 to 15 are fixed to each other. The end portion 10b opposite to the busbar joint portion 20 is a free end where the metal plates 11 to 15 are not fixed to each other. In this embodiment, as shown in FIG. 1, the area between the end portion 10a and the terminal joint portion 21 is provided. 18), a busbar joint 20 may be further provided in that region.

As shown in FIG. 1, the busbar 10 is joined to a plurality of terminals 31-34. The number of terminals 31 to 34 is two or more, preferably three or more. In this embodiment, four terminals 31-34 are provided. A plurality of terminals 31-34 are provided on electrical components 41-44. The electrical components 41 to 44 are not particularly limited, and battery cells, capacitors, reactors, coils, inverters, converters, and the like can be exemplified. The electrical components 41 to 44 may be of the same type or may be of different types. In this embodiment, the electrical components 41-44 are all battery cells. In this embodiment, the electrical components 41 to 44 are arranged along the width direction X. As shown in FIG.

As shown in FIG. 1, electrical components 41-44 have terminals 31-34 on the top. The electrical components 41 to 44 are arranged on the bottom surface of the case (not shown). Misalignment may occur. In this embodiment, as shown in FIG. 1, the second terminal 32 provided on the second electrical component 42 is slightly lower than the first terminal 31 provided on the first electrical component 41. in position. Also, the third terminal 33 provided on the third electrical component 43 is positioned slightly higher than the second terminal 32 . A fourth terminal 34 provided on the fourth electrical component 44 is positioned slightly lower than the third terminal 33 .

As shown in FIG. 1, the terminals 31-34 and the busbar 10 are joined together by terminal joint portions 21-24. The joining method for the terminal joining portions 21 to 24 is welding or welding. The welding and welding can be similar to the welding and welding in the busbar joint 20 described above.

Next, the work flow of the busbar joining method of this embodiment will be described with reference to FIGS. 2 and 3. FIG.
In the busbar joining method of the present embodiment, first, an integration step S1 shown in FIGS. 2(a) to 2(d) is performed. In the integration step S1, metal plates 11 to 15 are prepared as shown in FIG. 2(a). Then, as shown in FIG. 2(b), the metal plates 11 to 15 are overlapped in the thickness direction Z with their shapes aligned. After that, one end in the width direction X of the metal plates 11 to 15 which are overlapped is laser-welded as indicated by an arrow L in FIG. 2(b). In this embodiment, the laser is irradiated parallel to the thickness direction Z. As shown in FIG. As a result, a busbar joint portion 20 is formed in which one end portions of the metal plates 11 to 15 in the width direction X are joined together. By forming the busbar joint portion 20, the metal plates 11 to 15 are integrated to form the busbar 10 shown in FIGS. 2(c) and 2(d). In the present embodiment, the metal plates 11 to 15 are superimposed while aligning their shapes, but it is not necessary to align them. may

Thereafter, the terminal bonding step S2 shown in FIGS. 3(a) to 3(d) is performed. In the terminal joining step S2, as shown in FIG. 3A, the bus bar 10 is applied to the terminals 31 to 34 along the thickness direction Z, which is the direction in which the metal plates 11 are stacked. As a result, the bus bar 10 is temporarily placed on the terminals 31 to 34 such that the longitudinal direction of the bus bar 10 is parallel to the arrangement direction of the terminals 31 to 34 . Then, the bus bar 10 and the terminals 31 to 34 are joined while pressing the bus bar 10 against the terminals 31 to 34 in order from the terminals 31 to 34 closest to the bus bar joining portion 20 .

In this embodiment, first, as shown in FIG. 3A, the busbar 10 is pressed against the first terminal 31 of the terminals 31 to 34 that is closest to the busbar joint portion 20 via the jig 50. , the overlapping portion of the bus bar 10 and the first terminal 31 is irradiated with a laser in the thickness direction Z from the upper surface side of the bus bar 10 . As a result, the bus bar 10 and the first terminal 31 are melted together at the overlapping portion to form the first terminal joint portion 21, and the bus bar 10 and the first terminal 31 are joined to each other.

Next, as shown in FIG. 3B, the busbar 10 is pressed against the second terminal 32 located second closest to the busbar joint portion 20 among the terminals 31 to 34 via the jig 50 . As a result, the bus bar 10 is deformed downward in the height direction Z at the first intermediate portion 16 between the joint portion with the first terminal 31 and the joint portion with the second terminal 32 to form a bus bar. 10 abut against the second terminal 32 to bring them into surface contact with each other. In the present embodiment, since the third terminal 33 is positioned higher than the second terminal 32, the deformation of the first intermediate portion 16 causes the joint portion with the second terminal 32 and the third terminal to become deformed. The second intermediate portion 17 between the joint portion with 33 is also deformed upward in the height direction Z. As shown in FIG. Then, while the pressing by the jig 50 is maintained, the overlapping portion between the bus bar 10 and the second terminal 32 is irradiated with a laser from the upper surface side of the bus bar 10 in the thickness direction Z, and the overlapping portion is joined to the first terminal. A second terminal joint portion 22 is formed in the same manner as the portion 21, and the bus bar 10 and the second terminal 32 are jointed to each other.

After that, as shown in FIG. 3(c), the busbar 10 is pressed via a jig 50 against the third terminal 33, which is located third closest to the busbar joint portion 20 among the terminals 31-34. As a result, the second intermediate portion 17 is deformed so that the bus bar 10 abuts on the third terminal 33 and comes into surface contact with each other. Then, while the pressing by the jig 50 is maintained, the overlapping portion between the bus bar 10 and the third terminal 33 is irradiated with a laser from the upper surface side of the bus bar 10 in the thickness direction Z, and the overlapping portion is joined to the first terminal. A third terminal joint portion 23 is formed in the same manner as the portion 21, and the bus bar 10 and the third terminal 33 are jointed to each other.

After that, as shown in FIG. 3(d), the bus bar 10 is pressed through a jig 50 against the fourth terminal 34, which is the farthest from the bus bar joint portion 20, among the terminals 31 to 34 at the end. As a result, the bus bar 10 is deformed downward in the height direction Z at the third intermediate portion 18 between the joint portion with the third terminal 33 and the joint portion with the fourth terminal 34 to form a bus bar. 10 abut against the fourth terminal 34 to bring them into surface contact with each other. Then, while the pressing by the jig 50 is maintained, the overlapping portion between the bus bar 10 and the fourth terminal 34 is irradiated with a laser from the upper surface side of the bus bar 10 in the thickness direction Z, and the overlapping portion is joined to the first terminal. A fourth terminal joint portion 24 is formed in the same manner as the portion 21, and the bus bar 10 and the fourth terminal 34 are jointed to each other. Then, the pressing by the jig 50 is released, and the work flow ends. Thereby, the bus bar junction structure 1 shown in FIG. 1 is formed.

As shown in FIG. 1, the busbar joint structure 1 formed by the above-described integration step S1 and terminal joining step S2 includes a plurality of terminals 31 to 34 attached to a busbar 10 formed by overlapping a plurality of metal plates 11 to 15. Joined. The bus bar 10 has the plurality of metal plates 11 at positions (regions) different from the terminal joint portions 21 to 24 to which the terminals 31 to 34 are joined in the width direction X in which the plurality of terminals 31 to 34 are arranged. 15 to each other. In the busbar joint structure 1, as shown in FIG. 1, the metal plates 11 to 15 are relatively free at the first intermediate portion 16, the second intermediate portion 17 and the third intermediate portion 18 of the busbar 10. Since the metal plates 11 to 15 can be individually deformed, the generation of gaps between the metal plates 11 to 15 is suppressed. On the other hand, at the end of the busbar 10 opposite to the busbar joint 20, the positions of the ends of the metal plates 11 to 15 are varied.

Next, the effects of the busbar joining method of this embodiment will be described in detail.
According to the above-described bus bar joining method, the bus bar 10 formed in the integration step S1 is such that the metal plates 11 to 15 are not joined to each other in the portions other than the joining portions where the plurality of metal plates 11 to 15 are joined to each other. They are in a state of being superimposed on each other. Then, in the terminal bonding step S2, by pressing the bus bar 10 against the terminals 31 to 34 in order from the terminal closest to the bonding portion to bond the terminals 31 to 34, if there is a deviation in the height position of the terminals 31 to 34, each metal Since the plates 11 to 15 can be deformed individually and the bus bar 10 can be easily deformed according to the positional deviation, the assembly is excellent. By individually deforming the metal plates 11 to 15 according to the positional deviation of the terminals 31 to 34, the bus bar 10 can be prevented from wrinkling or sagging between the terminals 31 to 34. FIG. In addition, in the terminal joining step S2, the plurality of metal plates 11 to 15 and the terminals 31 to 34 are joined to each other by welding or welding. A sufficient bonding area with 34 is ensured, so that current can easily flow. Furthermore, since the terminal joints 21-24 are formed by welding, even if an oxide film is formed on the surfaces of the metal plates 11-15, it is possible to prevent the flow of current from being hindered. By these, the improvement of the electricity supply quality of the busbar 10 can be aimed at. It should be noted that even if the terminal joint portions 21 to 24 are formed by welding instead of welding, the same effect as welding can be obtained.

In addition, in the present embodiment, the busbar joints 20 are formed by welding in the integration step S1. As a result, the metal plates 11 to 15 are firmly adhered to each other at the busbar joint 20 compared to the case where screws are used, so that the contact resistance between the metal plates 11 to 15 can be reduced. Energization quality can be improved. It should be noted that even if the busbar joint portion 20 is formed by welding or brazing instead of welding, the same effect as that of welding can be obtained.

Further, in this embodiment, three or more terminals 31 to 34 are provided. As a result, the terminals 31 to 34 are likely to be misaligned. However, the busbar joining method of the present embodiment allows the busbar 10 to be easily deformed according to the misalignment of the terminals 31 to 34. and the terminals 31 to 34 can be suppressed, and the assemblability and the energization quality can be improved.

The busbar joint structure 1 according to the present embodiment is formed by joining a plurality of terminals 31 to 34 to a busbar 10 formed by stacking a plurality of metal plates 11 to 15, and the plurality of metal plates 11 to 15 are mutually It has a busbar joint portion 20 formed by joining, and terminal joint portions 21 to 24 formed by joining a plurality of metal plates 11 to 15 and a plurality of terminals 31 to 34 to each other by welding or welding. The busbar joint portion 20 is provided at a different position from the terminal joint portions 21 to 24 in the direction in which the terminals 31 to 34 are arranged. As a result, the portions of the busbar 10 where the terminal joint portions 21 to 24 are not formed are in a state in which the metal plates 11 to 15 are not joined to each other but overlapped with each other, except for the busbar joint portion 20. , the metal plates 11 to 15 can be relatively freely and individually deformed according to the positional deviation of the terminals 31 to 34 . Therefore, the bus bar 10 can be easily deformed according to the positional deviation of the terminals 31 to 34, and the assembly is excellent. In addition, since the metal plates 11 to 15 can be relatively freely deformed individually according to the positional deviation of the terminals 31 to 34, the intermediate portions 16 to 18 of the bus bar 10 are prevented from wrinkling or sagging. . Since the plurality of metal plates 11 to 15 and the terminals 31 to 34 are joined to each other by welding, the joint area between the plurality of metal plates 11 to 15 and the terminals 31 to 34 is sufficiently large as compared to bolt fastening. It is secured and the current flows easily. Furthermore, since the terminal joints 21-24 are formed by welding, even if an oxide film is formed on the surfaces of the metal plates 11-15, it is possible to prevent the flow of current from being hindered. By these, the improvement of the electricity supply quality of the busbar 10 can be aimed at. It should be noted that even if the terminal joint portions 21 to 24 are formed by welding instead of welding, the same effect as welding can be obtained.

As described above, according to the above-described aspect, it is possible to provide a busbar joining method that exhibits good assembling properties and high electrical quality.

(Embodiment 2)
In the first embodiment shown in FIGS. 2(a) to 2(d), the busbar joint 20 is provided at one end of the busbar 10 in the width direction X. In the busbar joining method, the busbar joining portion 20 is provided substantially at the center of the busbar 10 in the width direction X, as shown in FIGS. 4(b) to 4(d). In this embodiment, as shown in FIGS. 5(a) to 5(d), in the width direction X, the fourth electric component 44, the second electric component 42, the first electric component 41, the third electric component 3 electrical components 43 are arranged in this order. Therefore, in the width direction X, the fourth terminal 34, the second terminal 32, the first terminal 31, and the third terminal 33 are arranged in this order. Other components are the same as in the first embodiment, and the same reference numerals as in the first embodiment are used in the present embodiment, and the description thereof is omitted.

In the busbar joining method of the second embodiment, as shown in FIGS. 4(a) to 4(d), in the integration step S1, laser welding is performed at substantially the center of the overlapped metal plates 11 to 15 in the width direction X. Then, the busbar joint portion 20 is formed. Then, as shown in FIG. 5A, the second terminal 32, the third terminal 33, and the fourth terminal 34 are arranged in this order from the first terminal 31 located near the busbar joint 20. Join in the same manner as in 1. In the width direction X, after the first terminal 31 on one side of the busbar joint portion 20 is joined and the third terminal 33 is joined, the third terminal 33 on the other side of the busbar joint portion 20 is joined. The second terminal 32 may be joined and the fourth terminal 34 may be joined. Conversely, after joining the second terminal 32 on the other side with the busbar joint 20 as a reference and joining the fourth terminal 34, the first terminal on the one side with the busbar joint 20 as a reference is connected. 31 may be joined and a third terminal 33 may be joined. It should be noted that this embodiment also has the same effect as the case of the first embodiment.

In the above first embodiment, the metal plates 11 to 15 that are overlapped in the same shape are joined at one end in the width direction X to form the busbar joint 20. In the above embodiment 2, the center in the width direction X is the depth direction. Although the bus bar joint portion 20 is formed by joining along Y, the modified forms shown in FIGS. 6(a) to 6(d) may be used instead. In the modified example 1 shown in FIG. 6(a), a laser beam is irradiated only to the central portion in the depth direction Y of one end in the width direction X of the metal plates 11 to 15 that are superimposed with the same shape, and the bus bar is joined by irradiating it. A junction 20 is formed. 6(b), only two corners of one end in the width direction X of the metal plates 11 to 15 that are overlapped with the same shape are irradiated with a laser beam to join the bus bar. A junction 20 is formed. In addition, in the third modification shown in FIG. 6(c), only the central portion in the depth direction Y of the central portions in the width direction X of the metal plates 11 to 15 that are overlapped with the same shape is irradiated with a laser to join. The busbar joint portion 20 is formed by joining them together. 6(d), of the center portions in the width direction X of the metal plates 11 to 15 that are superimposed with the same shape, the depth direction Y is located between the front end portion and the Okukawa end portion. A busbar joint portion 20 is formed by irradiating a laser beam to a place and joining them. In any of Modified Embodiments 1 to 4, the same effects as in Embodiment 1 or Embodiment 2 are obtained.

(Embodiment 3)
In the first embodiment, as shown in FIG. 4(b), the metal plates 11 to 15 are joined together by forming the busbar joining portion 20 in the integration step S1. Instead, in the busbar joining method of the third embodiment, in the integration step S1, metal plates 11 to 15 are prepared as shown in FIG. The plates 11 to 15 are aligned with each other using a jig (not shown), overlapped in the thickness direction Z, and applied to the first terminal 31 by the jig 50 . Then, the overlapping portions of the metal plates 11 to 15 and the first terminal 31 are irradiated with a laser in the thickness direction Z from the upper surface side of the metal plates 11 to 15 . As a result, the metal plates 11 to 15 and the first terminal are melted together at the overlapping portions, and the busbar joints 20 for joining the metal plates 11 to 15 are formed to integrate the metal plates 11 to 15. The bus bar 10 is formed by Furthermore, the busbar 10 and the first terminal 31 are joined to each other at the busbar joint portion 20 . After that, as with the second terminal 32 to the fourth terminal 34 in the case of the first embodiment, as shown in FIGS. 4 terminals 34 are joined.

In the third embodiment, as described above, in the integration step S1, the plurality of metal plates 11 to 15 are integrated at the busbar joint portion 20, and the busbar 10 and one of the plurality of terminals 31 to 34 are joined. As a result, the bonding for integrating the plurality of metal plates 11 to 15 and the bonding for bonding the bus bar 10 and one terminal 31 can be performed at the same time, thereby reducing the number of work steps. It should be noted that this embodiment also has the same effect as the case of the first embodiment.

In the third embodiment, the busbar joint portion 20 is formed at the overlapping portion between the first terminal 31 and the metal plates 11 to 15 among the plurality of terminals 31 to 34. The busbar joints 20 may be formed at overlapping portions between any of the terminals 32-34 and the metal plates 11-15.

The present invention is not limited to the above embodiments, and can be applied to various embodiments without departing from the scope of the invention.

1 busbar joint structure 10 busbar 11-15 metal plate 16-18 intermediate portion 20 busbar joint portion 21-24 terminal joint portion 31-34 terminal

Claims (5)

A busbar joining method for joining a busbar to a plurality of terminals, comprising:
an integration step of forming a busbar by integrating the plurality of metal plates by overlapping a plurality of metal plates and joining portions of each of the plurality of metal plates to form a busbar joint portion; ,
In a state in which the bus bar is applied to the plurality of terminals along the overlapping direction of the plurality of metal plates, the bus bar is pressed against the terminal in order from the terminal closest to the bus bar joint portion among the plurality of terminals. a terminal joining step of joining the plurality of metal plates and the terminals to each other by welding or welding to form a terminal joint portion;
Busbar joining method including. 2. The busbar joining method according to claim 1, wherein in said integrating step, said busbar joining portion is formed by welding, welding or brazing. 3. The busbar joining method according to claim 1, wherein in said integrating step, said plurality of metal plates are integrated at said busbar joining portion and said busbar and one of said plurality of terminals are joined. The busbar joining method according to any one of claims 1 to 3, wherein three or more of the terminals are provided. A busbar joint structure in which a plurality of terminals are joined to a busbar formed by overlapping a plurality of metal plates,
a busbar joint portion formed by joining the plurality of metal plates to each other;
a terminal joint portion in which the plurality of metal plates and the plurality of terminals are joined to each other by welding or welding;
The busbar joint structure, wherein the busbar joint is provided at a position different from the terminal joint in a direction in which the plurality of terminals are arranged.

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