JP2017069072A - Bus bar and method for manufacturing bus bar - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus bar capable of improving the yield of a material for punching a terminal section and also capable of ensuring stable conductivity, and a method for manufacturing a bus bar.SOLUTION: A bus bar includes: a tuning fork terminal section 10 connected to an electric component; a bus bar body section 20 formed of a metal plate with conductivity; and a laser-welded portion 30 which integrates the tuning fork terminal section 10 and the bus bar body section 20 and where a terminal side joining surface that is a lower end surface of the tuning fork terminal section 10 and a body side joining surface that is an upper end surface of the bus bar body section 20 are welded by laser welding.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bus bar that is housed in, for example, an electric connection box mounted on an automobile.

  For example, an engine room of an automobile is provided with an electric junction box for efficiently distributing electric power supplied from a battery to electric parts provided in various parts of the vehicle. Some of such electrical junction boxes distribute power to each electrical component through a bus bar housed inside.

  As shown in FIG. 5, the conventional bus bar 500 includes a terminal portion 510 that is a tuning fork terminal having a thickness t, and a body portion 520 that is the same thickness as the terminal portion 510 and has a height of 2 h. This is formed by punching a single conductive metal plate. For this reason, the conductive metal plates between the adjacent terminal portions 510 after being punched are discarded, and there is a problem that the yield of the conductive metal plates is poor.

  In order to solve such a problem, a bus bar including a terminal portion and a bus bar main body portion separately configured and a fixing portion that locks the terminal portion and the bus bar main body portion together is disclosed in Patent Document 1. Has been proposed.

  In the bus bar proposed in Patent Document 1, the terminal portion and the bus bar main body portion are configured separately, so that the terminal portion can be punched from the conductive metal plate without waste. It is said that the yield can be improved. In addition, by providing the fixing portion, the terminal portion and the bus bar main body portion can be easily assembled at a predetermined position, and the assembled terminal portion and the bus bar main body portion can be easily locked. It can be released and removed.

  However, in the bus bar proposed in Patent Document 1, since the terminal portion and the bus bar main body portion are detachable, the pressure applied to the terminal portion and the bus bar main body portion, the terminal portion, and the bus bar main body. Depending on the contact state with the part, the conductive contact surface was not stable. For this reason, it has been difficult to ensure stable conductivity. In addition, the terminal portion may be unintentionally detached from the bus bar main body due to vehicle vibration or the like.

JP 2009-171762 A

  In view of the above-described problems, an object of the present invention is to provide a bus bar that can improve the yield of a material for punching a terminal portion and can ensure stable conductivity, and a method for manufacturing the same.

  The present invention integrates a terminal portion connected to an electrical component, a bus bar main body portion formed of a conductive metal plate, the terminal portion and the bus bar main body portion, and the bus bar main body portion and the terminal. It is a bus bar comprised by the weld part by which the end surfaces which face a part were welded.

  Moreover, this invention is a manufacturing method of the bus bar which abuts the end face of the bus bar main body part comprised with the end surface of the terminal part connected with an electrical component, and the metal plate which has electroconductivity, and contacted the said end faces. It is characterized by that.

The bus bar includes a bus bar stored in an electrical connection box such as a relay box, a junction box, or a fuse box, a terminal block, or the like.
The terminal portion may have any shape as long as it can be directly or indirectly connected to the electrical component. For example, the terminal portion may be a female terminal or a male that is fitted and connected to a terminal through the connection with the electrical component. Includes terminals, tuning fork terminals, bolted terminals, etc. The electrical component includes electrical equipment and electronic equipment.

  The welding refers to welding in which the bus bar main body portion and the terminal portion are integrated, and includes, for example, laser welding, arc welding, resistance welding, ultrasonic welding, and the like.

According to the present invention, it is possible to provide a bus bar capable of improving the yield of the material for punching the terminal portion and ensuring stable conductivity, and a method for manufacturing the same.
More specifically, the terminal portion and the bus bar main body portion can be separately formed by punching from the conductive metal plate by configuring the terminal portion separately from the bus bar main body portion. That is, since the terminal portion and the bus bar main body portion can be punched out of the conductive metal plate in accordance with each shape, the bus bar formed integrally with the terminal portion and the bus bar main body portion is made of a single conductive material. Compared to the case of punching from a conductive metal plate, the yield of the conductive metal plate can be improved.

  In addition, since the bus bar main body portion and the terminal portion are integrally configured by the welded portion where the end surfaces of the bus bar main body portion and the terminal portion are welded together, stable continuity can be ensured, It can prevent that the said bus-bar main-body part and the said terminal part remove | eliminate unintentionally by vibration etc. Therefore, it is possible to reliably conduct to an electronic component or the like connected to a battery or the like via the bus bar.

  Furthermore, by adopting a configuration in which the opposite end surfaces of the bus bar main body portion and the terminal portion are welded together, for example, there is no need to provide a fixing portion for locking the terminal portion on the bus bar main body portion. The main body can be used for vehicles of different vehicle types and grades. That is, it is not necessary to perform a process of providing a fixing portion on the bus bar main body, and the bus bar main body can be used for various designs. Therefore, it is possible to reduce labor and cost for processing the bus bar main body.

Further, as an aspect of the present invention, the bus bar main body portion may be made of a copper alloy or pure copper having a higher conductivity than the terminal portion.
The copper alloy refers to a copper alloy containing a metal such as iron or zinc in addition to copper, and specific examples of the copper alloy include brass composed of copper and zinc, and copper and nickel. This refers to the white and white made up of and the like.

The pure copper refers to a material based on electric copper having a purity of 99.9% or more, and specifically refers to tough pitch copper, phosphorous deoxidized copper, oxygen-free copper, or the like.
The copper alloy or pure copper having a higher conductivity than the terminal portion described above may be any copper alloy or pure copper as long as it has a higher conductivity than the terminal portion. Pure copper showing excellent characteristics in terms of conductivity and heat conduction is more preferable.

According to the present invention, the electrical conductivity and thermal conductivity of the entire bus bar can be improved.
More specifically, the conventional bus bar is manufactured by punching a conductive metal plate having a low conductivity that forms the tuning fork terminal portion, so that the conductivity of the entire bus bar is lowered. However, by configuring the bus bar main body portion with a copper alloy having a higher conductivity than the tuning fork terminal portion, the conductivity of the entire bus bar is improved as compared with a conventional bus bar. Therefore, for example, it is possible to improve the transmission performance of electrical signals transmitted from the battery to the electrical components via the bus bar.

  In addition, since the thermal conductivity is improved as compared with the conventional bus bar, the amount of heat released from the bus bar main body also increases, and the thermal design of the board becomes easy. Therefore, the electric signal transmission performance can be improved and the probability of failure due to heat accumulation can be reduced.

As an aspect of the present invention, the terminal portion may be composed of a tuning fork terminal portion made of a copper alloy or pure copper, which is more elastic than the bus bar main body portion.
According to the present invention, the bus bar and the electrical component can be reliably connected.

  More specifically, the terminal portion is composed of a tuning fork terminal portion made of copper alloy or pure copper, which is more elastic than the bus bar main body portion, so that it is suitable for the tuning fork terminal without being influenced by the characteristics of the bus bar. A copper alloy or pure copper having high elastic properties can be selected. Accordingly, the tuning fork terminal can securely sandwich the terminal, and the bus bar and the electrical component can be reliably connected.

  In addition, since the tuning fork terminal can securely pinch the terminal, the tuning fork terminal portion and the terminal can be reliably fixed, so that contact resistance between the terminal connected to the electrical component and the tuning fork terminal can be suppressed. . Therefore, the contact resistance of the connecting portion of the terminal can be suppressed, and heating of the connecting portion can be prevented.

  Furthermore, for example, since the metal plate constituting the bus bar main body portion can be made of a copper alloy that is less expensive than the metal plate constituting the tuning fork terminal portion having elasticity, the material cost can be suppressed. .

Further, as an aspect of the present invention, the bus bar main body portion may have a plate thickness that is thicker than the thickness of the terminal portion.
According to the present invention, the bus bar can be made compact while maintaining the conductivity of the entire bus bar.

  More specifically, the volume of the bus bar main body can be increased by making the bus bar main body thicker than the terminal. As a result, the number of free electrons that can move inside the bus bar main body increases, and the conductivity of the bus bar can be improved. That is, even when the bus bar main body is made thicker than the terminal bar, the overall conductivity of the bus bar can be maintained. Therefore, the bus bar can be made compact, and the shape of the connection box that houses the bus bar can be made compact.

  Moreover, by making the thickness of the bus bar main body portion thicker than that of the terminal portion, the contact portion between the end surfaces of the terminal portion and the bus bar main body portion can be reliably ensured, and the end surfaces can be reliably connected by welding. Therefore, stable continuity between the battery and the electrical component via the bus bar can be ensured.

Moreover, as an aspect of the manufacturing method of the bus bar, the welding may be laser welding.
The laser welding refers to welding metals that have been abutted using laser light, and the type of laser light used for welding is not limited.

  According to the present invention, by using laser welding that can be welded in a short time even in a narrow range, the terminal portion having a fine structure with respect to the bus bar main body is accurately welded to the bus bar main body in a short time. can do. Therefore, an accurate bus bar can be formed with less distortion due to welding.

  According to the present invention, it is possible to provide a bus bar capable of improving the yield of the material for punching the terminal portion and ensuring stable conductivity, and a method for manufacturing the same.

The schematic perspective view of a bus bar. Explanatory drawing of a bus bar. Explanatory drawing of a tuning fork terminal part. Explanatory drawing of the manufacturing method of a bus bar. Explanatory drawing of the conventional bus bar.

  FIG. 1 is a schematic perspective view of the bus bar 1, and FIG. 2 is an explanatory diagram of the bus bar. Specifically, FIG. 2A shows a front view of the bus bar 1, and an AA line in the drawing shows a cutting position of the AA cross section of the bus bar 1 in FIG. 2B. FIG. 2B shows an enlarged cross-sectional view of the bus bar 1 along AA. In addition, the front view of FIG. 2A refers to a view when the bus bar 1 is viewed along the short direction from the right side in FIG.

  FIG. 3 is an explanatory diagram of the tuning fork terminal unit 10. Specifically, FIG. 3A shows a front view of the tuning fork terminal 10 in a state in which the tuning fork terminal portion 10 is punched from the metal band 100 for tuning fork terminals, and FIG. 3B shows an enlarged front view of the tuning fork terminal 10. .

  FIG. 4 is an explanatory diagram of a method for manufacturing the bus bar 1. Specifically, FIG. 4A shows an exploded perspective view of the tuning fork terminal portion 10 and the bus bar main body portion 20 before joining. The BB line in Fig.4 (a) shows the cutting position of the CC cross section of the bus bar 1 in FIG.4 (c). 4B is a schematic side view of the tuning fork terminal portion 10 and the bus bar main body 20 in an assembled state, and FIG. 4C is a schematic view of a welding situation between the tuning fork terminal portion 10 and the bus bar main body 20 BB. A cross-sectional view is shown.

  FIG. 5 is an explanatory diagram of a conventional bus bar 500. Specifically, FIG. 5A shows a schematic front view of the bus bar 500, and a BB line in the drawing shows a cutting position of the BB cross section of the bus bar 500 in FIG. 5B. FIG. 5B shows an enlarged cross-sectional view of the bus bar 500 taken along the line C-C.

The configuration of the bus bar 1 will be described below.
As shown in FIGS. 1 and 2, the bus bar 1 includes three tuning fork terminal portions 10 and a bus bar main body portion 20 that is a single rectangular plate. Further, the one surface forming the tuning fork terminal portion 10 and the one surface forming the bus bar main body portion 20 are flush with each other, and the tuning fork terminal portion 10 and the bus bar main body portion 20 are integrally formed via the laser welding portion 30. (See FIG. 2 (b)).

  In FIG. 2A, three tuning fork terminals 10 arranged side by side along the longitudinal direction of the bus bar body 20 are referred to as a tuning fork terminal 10a, a tuning fork terminal 10b, and a tuning fork terminal 10c from the left. The distance between the tuning fork terminal 10a and the tuning fork terminal 10b in the longitudinal direction of the bus bar body 20 is larger than the distance between the tuning fork terminal 10b and the tuning fork terminal 10c.

  In the present embodiment, the tuning fork terminals 10 constituting the bus bar 1 are not arranged at regular intervals, and the number of tuning fork terminals 10 is three, but the configuration of the bus bar 1 is not necessarily limited to this configuration. There is no need, and the number and interval are appropriately changed according to the vehicle type and grade.

  As shown in FIG. 3 (a), the tuning fork terminal portion 10 is a single tuning fork terminal made of a copper alloy having a conductivity t of 82% IACS and having a thickness greater than that of the bus bar main body portion 20 and having a thickness t. It is a tuning fork terminal formed by punching the metal strip 100, and a terminal side joint surface 11 which is a joint surface with the bus bar main body 20 is formed on the lower end surface thereof (see FIG. 4B).

  The conductivity is described on the basis of a standard in which the conductivity of annealed standard annealed copper adopted internationally is 100% IACS, and the description of IACS is omitted hereinafter.

  Further, as shown in FIGS. 2A and 3B, the tuning fork terminal portion 10 includes a base end portion 12 formed below and a pair of sandwiching pieces 13 extending vertically above the base end portion 12. And the connecting portion 14 disposed on the distal end side of the sandwiching piece 13 are integrally formed. As shown in FIG. 3B, a slit 40 is formed by the base end portion 12, the sandwiching piece 13, and the connecting portion 14. Forming.

The base end portion 12 is a plate-like portion that is formed on the lower end side of the tuning fork terminal portion 10 and has a substantially rectangular shape in front view.
As shown in FIG. 3B, the sandwiching piece 13 has a substantially trapezoidal shape in front view that tapers toward the upper end side above the base end portion 12, and one side of the sandwiching piece 13 is the base end in front view. It connects with the part 12, and it arrange | positions so that a hypotenuse may be located inside the tuning fork terminal part 10. FIG. In other words, it is arranged so that the oblique sides of the pair of sandwiching pieces 13 face each other, and is formed in a V shape so that the intersection is located in the center portion in front view. In addition, the intersection of the oblique sides of the pair of sandwiching pieces 13 forms a closed portion 13a that is rounded by chamfering.

  The connection portion 14 provided at the tip of the sandwiching piece 13 is a plate-like body having a substantially circular shape when viewed from the front, protrudes inward, and the pair of connection portions 14 are opposed to each other with a predetermined interval. Part 14a is formed.

  In the central portion of the tuning fork terminal portion 10 having such a configuration, a slit 40 is formed by the base end portion 12, the sandwiching piece 13 and the connection portion 14, for example, attached to the front end of a wire harness connected to an electrical component. The tab terminal can be fixed to the slit 40 by inserting the tab terminal or the like (not shown) from the opening portion 14a toward the closing portion 13a.

As shown in FIG. 2, the bus bar main body 20 has twice the thickness (thickness 2 t) of the tuning fork terminal 10 and is half the height (height) of the main body 520 constituting the conventional bus bar 500. h) A single plate, each corner being chamfered. Moreover, the main body side joining surface 21 which is a joining surface with the terminal side joining surface 11 is formed in the upper end surface of the bus bar main-body part 20 (refer Fig.4 (a)).
In addition, the material of the bus bar main-body part 20 is tough pitch copper whose purity of copper is 99.9% or more, and the electrical conductivity is 101%.

  As shown in FIG. 2, the laser welded portion 30 is a joint formed on the joint surface between the tuning fork terminal portion 10 and the bus bar main body 20, and is irradiated from a laser welding machine 200 (irradiation port 202) described later. It is a welded portion that integrally forms the tuning fork terminal portion 10 and the bus bar main body portion 20 by being welded with a YAG laser.

  In addition, the laser welding machine 200 can transmit the inside of the front-end | tip part 201 via the transmission tube with the YAG laser oscillated with the laser oscillation apparatus main body which is not shown in figure, and can irradiate it from the irradiation port 202 (FIG. 4 ( c)).

  The bus bar 1 having such a configuration is manufactured by welding the terminal side joining surface 11 which is the lower end surface of the tuning fork terminal portion 10 and the body side joining surface 21 which is the upper end surface of the bus bar main body portion 20. Hereinafter, the manufacturing method will be briefly described with reference to FIG.

  First, as shown in FIG. 4A, the tuning fork terminal portion 10 is formed by punching the tuning fork terminal metal strip 100 having a thickness t at a predetermined interval. Thus, unlike the conventional punching of the bus bar 500, the interval between the tuning fork terminal portions 10 can be minimized by punching the tuning fork terminal portion 10 from the metal band 100 for tuning fork terminals at a predetermined interval. Therefore, the negative yield of the tuning-fork terminal metal strip 100 can be improved.

In addition, after cutting a tough pitch copper plate having a thickness of 2 t to a desired length, each corner portion is chamfered to form the bus bar body 20.
In the present embodiment, the bus bar body 20 is a flat plate, but is not limited to this shape. For example, the bus bar body 20 may be formed by appropriately bending a plate. Specifically, a tough pitch copper plate that is chamfered into a desired shape after chamfering corners of a tough pitch copper plate cut to a desired length may be used.

  The tuning fork terminal portion 10 and the bus bar main body 20 thus formed are arranged so that predetermined surfaces (front surfaces in the drawing) are in contact with a flat surface, and the terminal-side joining surface 11 which is the lower end surface of the tuning fork terminal portion 10. And the main body side joining surface 21 which is the upper end surface of the bus bar main body portion 20 are arranged so as to oppose each other. Similarly, the plurality of tuning fork terminals 10 are arranged at predetermined positions along the longitudinal direction of the bus bar body 20.

  A laser welding portion 30 is formed by irradiating the YAG laser oscillated from the laser welding machine 200 to the joining portion between the terminal-side joining surface 11 and the body-side joining surface 21 which are abutted, and the tuning fork terminal portion 10 and the bus bar body portion. 20 are welded together.

  By performing this welding operation on each tuning fork terminal portion 10 arranged along the longitudinal direction of the bus bar main body portion 20, each tuning fork terminal portion 10 is welded to the bus bar main body portion 20, so that a plurality of tuning fork terminal portions 10 are provided. The bus bar 1 can be manufactured in which the bus bar body 20 is integrally formed.

  In the present embodiment, the tuning fork terminal portion 10 is welded to the plate-like bus bar main body portion 20, but the tuning fork terminal portion 10 may be welded to the bus bar main body portion 20 bent as described above. In this case, either bending or welding may be performed first.

  As described above, the tuning fork terminal portion 10 connected to the electrical component, the bus bar main body portion 20 formed of a tough pitch copper plate that is a conductive metal plate, and the tuning fork terminal portion 10 and the bus bar main body portion 20 are integrated. By making the bus bar 1 constituted by the laser welded portion 30 welded to the terminal-side joining surface 11 and the body-side joining surface 21 which are the opposing end surfaces of the bus bar main body portion 20 and the tuning fork terminal portion 10, The yield of the tuning-fork terminal metal strip 100 used for forming the tuning-fork terminal portion 10 can be improved, and stable conductivity can be ensured.

  More specifically, when the terminal portion 510 and the main body portion 520 are punched together as in the conventional bus bar 500 shown in FIG. 5, even if the adjacent terminal portions 510 are separated from each other, It is necessary to punch out the tuning fork terminal metal strip 100 while maintaining the interval, and the tuning fork terminal metal strip 100 corresponding to the interval is discarded.

  However, by configuring the tuning fork terminal portion 10 separately from the bus bar main body portion 20, the tuning fork terminal portion 10 can be formed by being punched from the tuning fork terminal metal strip 100 separately from the bus bar main body portion 20. 2B, even if there is a sufficient gap between the tuning fork terminal portion 10a and the tuning fork terminal portion 10b, the tuning fork terminal portion 10 is made to be a metal band for tuning fork terminals. Since it can be punched out at a minimum interval from 100, it is possible to reduce the discard amount of the metal strip 100 for tuning fork terminals.

  In this way, the bus bar 1 can improve the yield of the tuning fork terminal metal strip 100, which is a conductive metal plate, as compared with the conventional bus bar 500 formed by punching from one tuning fork terminal metal strip 100.

  Further, the tuning fork terminal portion 10 and the bus bar main body portion 20 are formed by the laser welding portion 30 that welds the terminal side joint surface 11 that is the end surface of the tuning fork terminal portion 10 and the main body side joint surface 21 that is the end surface of the bus bar main body portion 20. Since it is configured as a single body, stable conductivity can be ensured. Furthermore, it is possible to prevent the tuning fork terminal portion 10 from being unintentionally detached from the bus bar main body portion 20 due to vibrations of a vehicle or the like on which an electric connection box housing the bus bar 1 is mounted. Therefore, stable electrical conductivity can be ensured for an electronic component connected to a battery or the like via the bus bar 1.

  Furthermore, by adopting a configuration in which the opposing end surfaces of the tuning fork terminal portion 10 and the bus bar main body portion 20 are welded, there is no need to provide a fixing portion for locking the tuning fork terminal portion 10 to the bus bar main body portion 20, and the bus bar main body portion 20 can be used for vehicles of different vehicle types and grades. That is, it is not necessary to process the bus bar main body 20, and the bus bar main body 20 can be used for various designs. Therefore, it is possible to reduce labor and cost for processing the bus bar main body 20.

  Further, the tuning fork terminal portion 10 is constituted by a copper alloy tuning fork terminal having elasticity, and the bus bar main body portion 20 is constituted by a tough pitch copper plate which is pure copper having a higher conductivity than the copper alloy forming the tuning fork terminal portion 10. As a result, the electrical conductivity and thermal conductivity of the entire bus bar 1 can be improved while maintaining the elasticity of the tuning fork terminal portion 10.

  More specifically, by configuring the bus bar main body 20 with a tough pitch copper plate that is a copper alloy having a higher conductivity than that of the tuning fork terminal unit 10, the conductivity of the entire bus bar 1 can be improved. Thereby, for example, the transmission performance with respect to the electrical signal transmitted from the bus bar 1 to the electronic devices can be improved.

  Moreover, since the thermal conductivity of the bus bar main body 20 is also improved, the amount of heat released from the bus bar main body 20 is increased. This facilitates the thermal design of the substrate. Therefore, it is possible to improve the electric signal transmission performance and reduce the probability of failure due to heat accumulation.

  Furthermore, the metal plate constituting the bus bar main body 20 can be made of tough pitch copper, which is less expensive than the tuning fork terminal metal strip 100 that forms the tuning fork terminal portion 10 having elasticity, thereby reducing the manufacturing cost. be able to.

  Furthermore, the bus bar body 20 has a plate thickness that is thicker than the thickness of the tuning fork terminal 10, so that the bus bar 1 can be made compact while maintaining the overall conductivity of the bus bar 1. it can.

  More specifically, by making the thickness of the bus bar main body portion 20 thicker than the tuning fork terminal portion 10, the volume of the bus bar main body portion 20 as a whole can be increased. As a result, the number of free electrons that can move inside the bus bar main body 20 is increased, and the conductivity of the bus bar 1 can be improved. That is, even if the height of the bus bar main body 20 is lowered instead of increasing the thickness of the bus bar main body 20 relative to the thickness of the tuning fork terminal 10, the number of free electrons in the bus bar main body 20 can be reduced. The conductivity of the entire bus bar 1 can be maintained without changing the number of internal free electrons. Therefore, the bus bar 1 can be made compact, and the shape of the connection box that houses the bus bar 1 can be made compact.

  In addition, by making the thickness of the bus bar main body 20 thicker than that of the tuning fork terminal portion 10, the contact portion between the end surfaces of the tuning fork terminal portion 10 and the bus bar main body portion 20 can be reliably ensured, and the end surfaces are reliably welded together by welding. it can. Therefore, the stable continuity between the battery and the electrical component via the bus bar 1 can be further ensured.

  Furthermore, the welding for manufacturing the bus bar 1 is laser welding, so that the tuning fork terminal portion 10 having a fine structure with respect to the bus bar main body portion 20 can be welded in a short time even in a narrow range. The bus bar main body 20 can be accurately welded in a short time. Therefore, an accurate bus bar 1 can be formed with less distortion due to welding.

  Furthermore, the tuning fork terminal portion 10 and the bus bar main body portion 20 are arranged and welded so that one surface of the tuning fork terminal portion 10 and one surface (front surface) of the bus bar main body portion 20 are flush with each other. Can do.

  For example, since the bus bar described in Patent Document 1 has a fixing portion, the fixing portion protrudes in the vertical direction from the surface of the bus bar main body, and there is a possibility that the bus bar contacts with an adjacent bus bar or a terminal fixed to the adjacent bus bar. It was. Therefore, it is necessary to design an electrical junction box that is larger than the electrical junction box that houses the conventional bus bar.

  However, in the bus bar of the present invention, the tuning fork terminal portion 10 and the bus bar main body 20 are integrated so as to be flush with each other by welding the end surfaces of the tuning fork terminal portion 10 and the bus bar main body 20 to each other. Therefore, a part of the tuning fork terminal part 10 or a part of the bus bar main body part 20 does not jump out from the surface of the bus bar main body part 20 in the vertical direction, and there is no possibility of contacting with the adjacent bus bar 1 or the like.

  Further, by making the tuning fork terminal portion 10 and the bus bar main body 20 flush with each other, the thickness of the bus bar main body portion is increased in the opposite direction to the direction in which the bus bar main body portion is flush, and the height thereof is reduced. The connection position with the electrical component can be made the same as in the case of the conventional bus bar 500. Therefore, it can be used without changing the standard of the connection part of the electrical parts to the bus bar 500 used conventionally.

In correspondence between the configuration of the present invention and the above-described embodiment,
The terminal portion corresponds to the tuning fork terminal portion 10,
The welded part corresponds to the laser welded part 30,
The present invention is not limited only to the configuration of the above-described embodiment, and many embodiments can be obtained.

  For example, in the present embodiment, the terminal is the tuning fork terminal 10, but it is not necessarily a tuning fork terminal, and the shape may be changed according to the terminal connected to an electrical component or the like. Specifically, it may be a female terminal, a male terminal, a bolted terminal, and the like that are fitted and connected to a terminal through connection with an electrical component.

  In this embodiment, the electrical conductivity of the tuning fork terminal is set to 82%. However, the electrical conductivity of the tuning fork terminal is not limited to this electrical conductivity. May have a high conductivity.

  The bus bar 1 is welded with a YAG laser, which is a solid-state laser, but the laser used for welding need not be a YAG laser, and may be, for example, a gas laser, a solid-state laser, a semiconductor laser, or a liquid laser. That is, any laser may be used as long as the tuning fork terminal 10 and the bus bar body 20 can be welded.

  Furthermore, any welding method other than laser welding may be used as long as the tuning fork terminal 10 and the bus bar body 20 can be welded. For example, arc welding, laser welding, resistance welding, ultrasonic welding, etc. May be used for welding.

  Further, in the present embodiment, the thickness of the bus bar main body 20 is set to a thickness 2t that is twice the thickness t of the tuning fork terminal 10 and the height of the bus bar main body is set to a height h. The height and thickness of the bus bar body 20 are not limited to the thickness and height, and are appropriately changed depending on the conductive performance required by the vehicle type and the efficiency of heat exchange. Specifically, the thickness of the bus bar main body 20 may be 2t while the height may be 2h.

  Furthermore, in the present embodiment, the surface on which the tuning fork terminal portion 10 and the bus bar main body portion 20 are flush with each other is the right surface in FIG. Accordingly, the left side surfaces of the tuning fork terminal portion 10 and the bus bar body portion 20 in FIG. 1 may be welded as appropriate.

  If the tuning fork terminal portion 10 and the bus bar main body portion 20 are not flush with each other, some variation occurs in the joining position of the tuning fork terminal portion 10. Therefore, it is preferable that the tuning fork terminal portion 10 and the bus bar main body portion 20 be flush with each other so that the connection position with the electrical component can be reduced and the connection can be reliably performed.

DESCRIPTION OF SYMBOLS 1 ... Bus bar 10 ... Tuning fork terminal part 11 ... Terminal side joining surface 20 ... Bus bar main-body part 21 ... Main body side joining surface 30 ... Laser welding part 200 ... Laser welding machine 201 ... Tip part 202 ... Irradiation port 500 ... Bus bar 510 ... Terminal part 520 ... Main unit

Claims (7)

A terminal portion connected to an electrical component;
A bus bar body composed of a conductive metal plate;
The bus bar comprised of the welded portion in which the terminal portion and the bus bar main body portion are integrated and the end faces facing the bus bar main body portion and the terminal portion are welded to each other. The bus bar body is
The bus bar according to claim 1, wherein the bus bar is made of a copper alloy or pure copper having a higher conductivity than the terminal portion. The terminal portion is
Consists of a tuning fork terminal made of copper alloy having elasticity more than the bus bar body,
The bus bar according to claim 1 or claim 2. The bus bar body is
The bus bar according to any one of claims 1 to 3, wherein the bus bar is thicker than a thickness of the terminal portion. While matching the end face of the terminal part connected to the electrical component and the end face of the bus bar body part made of a conductive metal plate,
The manufacturing method of the bus bar which welds the said end surfaces which contacted. While making the said terminal part into an elastic copper alloy,
The bus bar manufacturing method according to claim 5, wherein the bus bar main body portion is made of a copper alloy having higher conductivity than the terminal portion. The bus bar manufacturing method according to claim 5, wherein the welding is laser welding.

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