JP2006261100A - Bus bar and electric circuit system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent stress from concentrating on a potting surface in fastening a bus bar when the bus bar is potted. <P>SOLUTION: A bus bar 239 is composed by connecting a plate-like bus bar 220 to a bent-structure bus bar 240 with a bolt 222. The bent-structure bus bar 240 is composed of two thin metal plates 242 and 244 each having a bent part 246; and the metal plates 242 and 244 are potted to a capacitor 200. Since the two thin metal plates 242 and 244 disperse forces to roots 250 thereof and the bent parts 246 are easily deformed, stress acting between the roots 250 and the potting surfaces can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bus bar that forms a power transmission path, and more particularly to a structure of the bus bar.

  In an electric circuit, a bus bar made of a conductor piece such as copper or aluminum and forming a power transmission path is often used. For example, in an electric vehicle, a bus bar is used for connection between a DC power source and an inverter, and between an inverter and a motor, and a large amount of electric power is transmitted. The bus bar usually has terminal portions at both ends thereof, and each terminal portion is fastened to a corresponding external terminal, thereby electrically connecting the external terminals.

  FIG. 11 is a diagram for explaining an example when it is assumed that a general bus bar having a simple structure is used for a power supply system of an electric vehicle. This electric system relates to a power supply system including a capacitor 200, an IPM (intelligent power module) 202, and a boost converter 204. The capacitor 200 functions as a DC power source, and the IPM 202 includes an inverter that converts DC power into AC. Boost converter 204 has a function of increasing the voltage of DC power sent from the DC power supply.

  A bus bar 270 is attached to the capacitor 200. The bus bar 270 is formed of an elongated plate-like metal plate, and one end thereof is connected to the capacitor 200 and is potted to the capacitor 200 and fixed with resin. The other end of the plate-like bus bar 270 is overlapped with the terminal 224 of the IPM 202 and the plate-like bus bar 226 connecting the IPM 202 and the boost converter 204 and fastened by a bolt 228. The bus bar 270 is strongly pressed near the tip toward the IPM 202 by this fastening.

  Patent Document 1 below discloses a technique in which a spring structure in which a metal is bent is provided on a part of a bus bar connected to a current extraction terminal of a fuel cell, and a thermal expansion / contraction difference between the stacked cell and the bus bar is absorbed.

  The following Patent Document 2 discloses a bus bar that also serves as a reinforcing body for preventing deformation of the device board. This bus bar is provided with a structure that is repeatedly bent to the left and right or an arc-shaped structure, so that distortion is absorbed when the bus bar thermally expands.

  Patent Document 3 below describes a wiring material in which a plate-like bus bar and a net-like conductor are combined. This technique secures the degree of freedom of the relative positions of devices to which the wiring members are coupled by utilizing the flexibility and stretchability of the mesh conductor.

JP-A-61-193376 (especially page 6 of the specification, FIG. 1) Japanese Patent Laid-Open No. 7-55877 (particularly, paragraphs 0008, 0016, FIGS. 1, 4 and 5) JP 2003-157722 A

  The bus bar 270 shown in FIG. 11 is strongly pressed against the IPM 202 side when the bolt 228 is fastened. However, the bus bar 270 cannot sufficiently absorb this large force, and stress concentrates on the potting surface with which the base portion 272 of the bus bar 270 contacts. For this reason, a large burden is imposed on the resin, for example, a resin crack is likely to occur around the root portion 272.

  On the other hand, in the bus bars shown in Patent Documents 1 and 2, stress is absorbed by simply providing a curved stretchable region. However, these techniques are not intended to reduce the load on the resin around the potted bus bar, and the effects on prevention and suppression of resin cracking are unknown. Further, with the technique of Patent Document 3, there is a concern that the manufacturing cost increases.

  An object of the present invention is to develop a bus bar having improved characteristics for releasing stress.

  Another object of the present invention is to introduce a new structure for relieving stress on the bus bar.

  Another object of the present invention is to reduce the load between the bus bar and the resin that acts when the bus bar is potted with resin.

  The bus bar of the present invention is a bus bar formed using a conductor having two terminal parts and a main body part connecting the terminal parts, and one end side of the main body part is fixed by a resin filled in the surroundings. The non-fixed area of the main body is provided with a deformable structure that is easily bent and deformed.

  The bus bar may be created using an integral member, or may be created through fastening or welding of a plurality of members. The fixed area refers to a portion that is covered with resin by potting and is fixed to a device or the like. At the end of the fixed area (near the potting surface), a large stress is applied with the fastening of the bus bar and the like, so that the resin is easily deteriorated such as a resin crack. In order to prevent or reduce this, a variable structure (hereinafter sometimes referred to as a variable portion) is provided in the non-fixed area. Typically, the main body portion is formed in a long plate shape extending between the terminal portions, but may be formed in other shapes such as a rod shape or a square shape.

  In one embodiment of the bus bar of the present invention, the deformable structure is a vent structure. That is, at least one curved portion (bent portion) is included, and stress is absorbed by the ease of bending of this portion.

  In one aspect of the bus bar of the present invention, the deformable structure is a structure in which a plurality of conductors are disposed so as to face each other. That is, the deformable structure is formed by using a plurality of plate-shaped conductors. The plurality of sheets are typically two sheets, but of course, three or more sheets may be used. In general, a portion made of a plurality of thin plates can absorb stress more than a portion made of a single thick plate (the same is true when a plurality of thin plates are fixed to be substantially one piece). The degree of each plate pressure is not particularly limited, but it is preferably thinner than the plate pressure of the non-variable structure portion in order to enhance the stress absorption effect. Further, from the viewpoint of making the electric resistance of the steady current to be approximately the same as that of the non-variable structure portion, it is desirable that the total cross-sectional area of each plate pressure is approximately the same as that of the non-variable structure portion. However, when high-frequency power is supplied, there is a possibility that the surface area should be approximately the same considering the display effect.

  Various materials and thicknesses of the plurality of conductors can be set. However, it can be said that it is better to make the materials and thicknesses of the conductors uniform and to set the conductors substantially in parallel from the viewpoint of making the bendability easier. The conductors may be arranged at a distance where they are in contact with each other. In general, it is considered that the bendability is improved by increasing the distance so as not to contact each other. When the deformable structure has both a vent structure and a structure composed of a plurality of conductors, typically, each of the plurality of conductors is provided with a vent structure. At this time, the bending size and position of the bent structure of each conductor may be the same or different. Further, the direction of the bending may be the same or different. As a result, there is room for designing a structure that can flexibly absorb bending stress in either direction of bending or rolling. On the other hand, as described above, from the viewpoint of aligning the properties of the respective conductors, it is preferable that the structure be curved in the same shape and in the same direction.

  This bus bar is different from a plurality of independent thin bus bars. When installing a plurality of independent bus bars, a satisfactory result is not necessarily obtained in terms of space saving and man-hours during installation. In the present invention, it is assumed that at least a part of the bus bar is formed of a single metal, or formed so that a plurality of bus bars are fixed and regarded as a single sheet.

  In one aspect of the bus bar of the present invention, the plurality of conductors extend to a fixed region. That is, one end side of each small conductor path is fixed by the resin filled in the periphery. Thereby, dispersion | distribution of the force which acts on resin (especially potting surface) is achieved. Each of the plurality of conductors may extend to the terminal portion on the fixed area side. In this way, when a plurality of conductors are connected to the same external terminal, it can be considered that each conductor constitutes one terminal portion.

  In one aspect of the bus bar of the present invention, the terminal portion on the non-fixed area side has a structure fastened to the external terminal by a bolt. When a bus bar is used, first, the terminal portion on the fixed area side is first electrically connected to the terminal of the first device, and is resin-fixed to the first device, and then to the second device. The electrical connection is made. In the bus bar shown here, the electrical connection to the second device is made by bolting. Bolt tightening is excellent in that it can be easily performed. However, when the bolt is tightened, a bending stress acts on the bus bar, and particularly a large stress is applied to the potting surface. However, this bus bar has a deformable structure and releases stress to reduce the load on the potting surface. As a reaction of the load on the potting surface, the force acting in the direction of loosening the bolt with respect to the bolt fastening portion can also be reduced. Therefore, it is possible to reduce the size of the bolt and the size of the second device.

  An electric circuit system of the present invention includes a first device, a second device, and the bus bar, and the bus bar is electrically connected to a terminal of the first device at a terminal portion on a fixed area side. The fixed region is fixed to the first device by the resin filled around, and the terminal portion on the non-fixed region side is electrically connected to the terminal of the second device. For example, the electric circuit system can be employed as a power supply system for an electric vehicle. In this case, for example, the first device can be a capacitor and the second device can be an IPM (inverter).

  In addition, as the bus bar of the present invention, various modes as described below can be adopted, and it is also effective to combine one or more of these modes with the above mode.

  In one aspect of the bus bar of the present invention, the bus bar has a long shape formed of a conductor, and is provided on at least two terminal portions that are electrically connected to an external circuit and a main body portion sandwiched between the terminal portions. And a deformable portion that is easily bent and deformed.

  The shape of the bus bar is not particularly limited as long as it is a long shape, and may be a prism, a cylinder, or the like in addition to a plate shape. Moreover, the inside may be hollow. The terminal portions are typically provided at both ends of the bus bar and are respectively connected to external circuits. Moreover, although the connection of a terminal part is normally performed by fastening using a volt | bolt, you may be performed by other means, such as welding. The body portion sandwiched between the terminal portions is provided with a deformable portion. The deformable portion is configured to be easily deformed. The deformation may be elastic deformation or plastic deformation. By allowing the deformable portion to relieve the stress, it is possible to prevent loosening of the bolt and avoid a reduction in the contact area of the terminal portion. Further, since an excessive force is not applied near the terminals of the external circuit, no damage is caused in the vicinity of the terminals.

  In one aspect of the bus bar of the present invention, the deformable portion has a smaller cross-sectional area than other regions of the main body portion. For example, the cross-sectional area can be reduced by reducing the plate width by constricting the side surface of the plate, or by reducing the plate pressure by adding a dent to the plate surface. A portion having a small cross-sectional area is easily deformed and functions as a deformable portion.

  In one aspect of the bus bar of the present invention, the deformable portion has a hole, whereby the deformable portion has a smaller cross-sectional area than other regions of the body portion. By providing a hole penetrating from the front to the back, the cross-sectional area of the portion was reduced to reduce the strength and facilitate deformation.

  In one aspect of the bus bar of the present invention, the deformable portion is formed using a material that can be easily bent and deformed as compared with other regions of the main body portion. The material that can be easily bent and deformed refers to a material that is easily configured to bend and deformed by, for example, different types of metals and alloys, crystal structures, and the like, and different manufacturing processes from surrounding materials. What is necessary is just to join by welding etc., when manufacturing a deformable part and the other area | region of a main body separately and combining. When the electric resistance of the deformable portion increases, it is possible to reduce the resistance by making the cross-sectional area of the deformable portion larger than the cross-sectional area of other regions of the main body.

  In one aspect of the bus bar of the present invention, the deformable portion includes a plurality of conductor paths each having a smaller cross-sectional area than the other regions of the main body and extending in the long side direction. The plurality of conductor paths may be formed by combining conductor paths made separately, or may be formed by making elongated holes in the plate.

  In one embodiment of the bus bar of the present invention, the deformable portion is composed of a set of thin conductor wires. That is, it is formed by bundling or braiding the conductor wires.

  In one aspect of the bus bar of the present invention, the deformable portion has at least one curved portion. The curved part is a part that is usually formed in a straight line shape, but it is formed in a mountain shape (a valley shape if you change the way of view) like a “U” shape or a “U” shape. Refers to the part. That is, it refers to a series of shapes that are bent outward at one end and then bent inward again to return to the original position.

  In one aspect of the bus bar of the present invention, the deformable portion has at least two curved portions having different shapes. Different shapes refer to shapes that are not similar or similar but different in size. The at least two curved portions may be mountain-shaped and valley-shaped connections, mountain-shaped and mountain-shaped connections, or a linear portion may be provided between them. In general, curved portions having different shapes have different easiness of bending and different natural frequencies. By combining these, a bus bar capable of absorbing the stress accompanying various displacements is formed.

  The power supply system of the present invention is a power supply system for an electric vehicle that includes a DC power supply and an inverter that converts electric power supplied from the power supply to AC, and the bus bar is used in an electric supply path from the DC power supply to the inverter. . In particular, it is effective to use the bus bar of the present invention when the bus bar is fastened by bolting and greatly deformed. In general, in the power source of an electric vehicle, it is also desired to remove the stress that acts by causing a large amount of power to flow through the bus bar and causing a large thermal expansion or receiving vibration of the vehicle. Therefore, the bus bar of the present invention demonstrates its power.

  The first to fifth embodiments are shown below. These do not need to be performed independently of each other. For example, one or a plurality of techniques shown in the first to third modes can be incorporated into the fourth mode and the fifth mode. It is. In addition, here, a bus bar used in a power system of an electric vehicle will be described as an example, but it goes without saying that the present invention is not limited to this and can be used in various electric circuits.

[First embodiment]
The first embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram corresponding to FIG. 11, and the same components are denoted by the same reference numerals and description thereof is omitted.

  Here, the capacitor 200 is connected to the IPM 202 and the boost converter 204 using the bus bar 10 instead of the bus bar 270. Here, it is assumed that the bus bar 10 has a total length of about 10 cm, a width of 1 to 2 cm, and a thickness of about 2 to 3 mm. The bus bar 10 is provided with two curved portions 12 and 14, which are combined to form a mountain and a valley to form an S-shape.

  FIG. 2 is a perspective view of the bus bar 10. The bus bar 10 is an elongated plate formed by punching a metal flat plate, and the curved portions 12 and 14 are formed by plastic deformation as shown in FIG. Near the upper end of the bus bar 10 is a terminal portion 16 for electrical connection with the IPM 202 and the boost converter 204, and a bolt hole 20 for fastening with a bolt 228 is provided near the center of the terminal portion 16. ing. Further, the vicinity of the lower end of the bus bar 10 is a terminal portion 18 to be attached to the capacitor 200.

  The curved portions 12 and 14 occupy most of the main body between the terminal portions 16 and 18. The curved portions 12 and 14 are provided with elongated holes 22. For this reason, the cross-sectional area at the location where the elongated hole 22 is provided is smaller than the cross-sectional area near the region 24 of the main body, which is a portion where the elongated hole 22 is not provided.

  The curved portions 12 and 14 and the elongated holes 22 function as deformable portions. That is, here, the effect of facilitating the bending deformation due to the curvature and the effect of facilitating the bending deformation due to the small cross-sectional area are combined to make the bending deformation very easy. Yes. Then, the deformable portion releases stress caused by the fastening, so that, for example, stress concentration on the root portion 30 where the bus bar 10 is attached to the capacitor 200 in FIG. 1 can be avoided. Further, the terminal portion 16 is attached in close contact with the plate-like bus bar 226 to ensure a sufficient contact area, and thus the bolt 228 is not loosened.

  As a modification of this aspect, an example in which a plurality of small holes are provided in place of the elongated holes 22 to reduce the cross-sectional area, or the thickness and width are reduced to reduce the cross-sectional area, thereby reducing the strength. be able to. In addition, since an electrical resistance becomes large generally in the location where a cross-sectional area is small, it is desirable to design so that sufficient electrical conductivity can be ensured in the location where this cross-sectional area is small.

[Second form]
Next, the bus bar 40 according to the second embodiment will be described with reference to FIG. FIG. 3 is a diagram corresponding to FIG. 11, and the same components as those in FIG. The bus bar 40 includes a small curved portion 42 and a large curved portion 44, which are combined to form a mountain and a valley to form an asymmetric S-shape.

  The small bending portion 42 has a small lateral displacement (a low mountain height) and a short bending length. In contrast, the large bending portion 44 has a large lateral displacement and a long bending length. For this reason, the small bending portion 42 and the large bending portion 44 are different in ease of bending. For example, in the small curved portion 42, since stress that causes bending deformation is relatively concentrated, it can be expected to quickly respond and deform even when small stress is applied, but the bending region is also small. Therefore, it is considered that the amount of deformation is small. On the other hand, in the large curved part 44, since the area | region to bend is large, it becomes possible to deform | transform large according to the stress which is going to cause a deformation | transformation.

  In this manner, the ease of bending is improved by providing the curved portions 42 and 44 having different shapes. Note that since the degree of ease of bending depends on the magnitude of the curvature, it is also effective to set the curvature distribution so as to obtain the optimum bending. In general, when the curvature is large (the radius of curvature is small), stress that causes bending deformation tends to concentrate in the vicinity thereof, and since the bending is large, the curved shape tends to be small.

  In the bus bar 40 shown here, sufficient bending easiness can already be ensured by providing curved portions having different shapes. However, in order to further improve the ease of bending, a configuration that reduces the cross-sectional area, such as providing elongated holes in the curved portions 42 and 44, may be incorporated.

[Third embodiment]
Subsequently, the bus bar 50 according to the third embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a diagram corresponding to FIG. 11, and the same components as those in FIG. FIG. 5 is a partial perspective view of the bus bar 50 shown in FIG.

  The bus bar 50 includes plate-like portions 52 and 56 formed in a plane and a metal wire bundle portion 54 sandwiched therebetween. The metal wire bundle portion 54 is made by braiding a thin metal wire (copper wire), and is welded to the plate-like portions 52 and 56 at both ends. The length of the metal wire bundle portion 54 is about 1 cm here, but this length may be set according to the degree of deformation.

  For this reason, the metal wire bundle portion 54 is easily deformed (mainly plastic deformation) when subjected to stress. In the example shown in FIG. 4, the plate-like portions 52 and 56 maintain a planar shape, whereas the metal wire bundle portion 54 is bent and connects the two.

  In this way, it is possible to form a deformable portion that is easier to deform than the surroundings by braiding or bundling thin metal wires as a metal material that is easy to bend. In the set of thin metal wires, a gap is formed between the thin wires, so that the actual cross-sectional area is smaller than that of a metal plate or the like. Therefore, when an increase in electrical resistance becomes a problem, it is effective to make it apparently thicker than the surrounding metal plate.

[Fourth form]
A bus bar 209 according to the fourth embodiment will be described with reference to FIGS. 6 and 7 correspond to FIG. 11, and the same components are denoted by the same reference numerals and description thereof is omitted. 6 is a diagram illustrating a state immediately before the connection of the bus bar 209 is completed, and FIG. 7 is a diagram illustrating a state after the connection of the bus bar 209 is completed.

  The bus bar 209 is formed by connecting a bent bus bar 210 and a plate-like bus bar 220 with bolts 222. The vent structure bus bar 210 is attached to the capacitor 200. The vent structure bus bar 210 is composed of two metal plates 212 and 214 arranged in parallel, and includes a vent portion 216 that is bent in a gentle arc shape in the middle thereof. A plate-like bus bar 220 is connected to the vicinity of the tip of the vent structure bus bar 210. The connection is performed by sandwiching one end of the plate-like bus bar 220 between the two metal plates 212 and 214 and fastening with the bolt 222. The other end of the plate-like bus bar 220 is overlapped with the terminal 224 of the IPM 202 and the plate-like bus bar 226 connecting the IPM 202 and the boost converter 204 and fastened by a bolt 228. A slight gap is provided between the terminal 224 and the plate-like bus bar 226, and between the plate-like bus bar 226 and the plate-like bus bar 220, and consideration is given so that the arrangement of the respective components before installation is performed smoothly. .

  FIG. 7 is a diagram illustrating a state after the connection of the bus bars is completed in the electrical system illustrated in FIG. 6. Here, the plate-like bus bars 220 and 226 and the terminals 224 are fastened and in close contact with the bolts 228. The vent structure bus bar 210 and the plate-like bus bar 220 are pressed against the IPM 202 side by bolts 228. At this time, the bent portion 216 has a role of releasing stress acting on the bent structure bus bar 210 and the plate-like bus bar 220 by being bent flexibly.

[Fifth embodiment]
Next, the bus bar 239 according to the fifth embodiment will be described with reference to FIGS. The bus bar 239 corresponds to a modification of the bus bar 209 according to the fourth embodiment. 8 and 9 correspond to FIGS. 6 and 7 (and FIG. 11), and the same components are denoted by the same reference numerals and description thereof is omitted. FIG. 8 is a diagram illustrating a state immediately before the connection of the bus bar 239 is completed, and FIG. 7 is a diagram illustrating a state after the connection of the bus bar 239 is completed.

  The bus bar 239 is formed by connecting a bent bus bar 240 and a plate-like bus bar 220 with bolts 222. The main structure of the bus bar 239 is the same as that of the bus bar 209 shown in FIGS. That is, the vent structure bus bar 240 is constituted by two metal plates 242 and 244 having a vent portion 246 and arranged in parallel, and the metal plates 242 and 244 are potted on the capacitor 200. However, here, the thicknesses of the metal plates 242 and 244 are about half of the thickness of the plate-like bus bar 220, respectively. This is because the electric resistance by the two metal plates 242 and 244 is secured to the same level as that of the plate-like bus bar 220, and the ease of bending deformation of the vent portion 246 is aimed at.

  As shown in FIG. 8, the bus bar 239 is slightly tilted in a direction away from the IPM 202 and is fixed to the capacitor 200. The inclination is set so that the plate-like bus bar 220, the plate-like bus bar 226, and the terminal 224 are finally in parallel with each other. FIG. 9 is a view showing a state in which the bus bar 239 is fastened by the bolt 228 and is tightly fixed to the plate-like bus bar 226 or the like. In this state, if the inclination is not set, the plate-like bus bars 226 fixed by the bolts 228 are not parallel to each other. Therefore, in order to bring the plate bus bar 226 and the like into close contact with each other in parallel, it is necessary to increase the fastening force of the bolt 228 and to deform the plate bus bar 226 and the like. However, the inclination is set here as shown in the figure, and these can be brought into close contact with each other without deforming the plate-like bus bar 226 and the like. As a result, it is possible to prevent loosening of bolts in these portions and reduction in the area of the electrical connection surface.

Here, when comparing the force required to bend a certain bus bar and two bus bars having half the thickness to the same extent, it will be explained that the latter can be about 1/4 of the former. . According to the theory of cantilever beams in material mechanics, in the elastic region, when the displacement of the beam is δ, the load is P, the length of the beam is l, the Young's modulus is E, and the secondary moment of inertia is I,
δ = Pl ³ / (3EI)
The relationship is established. This equation states that P is proportional to I if δ is the same. Further, the cross-sectional secondary moment I is expressed as follows: b is the width of the beam and h is the thickness of the beam.
I = 1/12 × bh ³
It is. That is, when the thickness h becomes 1/2, I, that is, the force required for bending becomes 1/8. In this embodiment, since two bus bars having a half thickness are prepared, the force required to bend the bus bar is 1/4 that is doubled 1/8.

  As can be seen from the above, in order to improve the ease of bending of the bus bar, it is effective to provide a portion composed of a plurality of metal plates thinner than others. In particular, as in the case of the bus bar 239 shown here, when a bent portion 246 that is susceptible to bending deformation force is provided for each of a plurality of thin metal plates, the force absorption effect can be further improved. I can expect.

  Further, the bus bar 239 is fixed by potting two metal plates 242 and 244 arranged at a distance from the capacitor 200. As a result, the force exerted on the resin around the base can be reduced to about half compared to the case of simply potting a single metal plate. Therefore, resin cracks and the like are less likely to occur, and durability is improved and life is extended. In this way, when the bus bar is fixed by filling the periphery of the bus bar with the resin, the bus bar is branched to a plurality of metal plates arranged at a distance, and the metal plate is fixed to the resin by resin fixing. It is possible to disperse the acting force.

  FIG. 10 is a reference diagram for contrasting the advantages described above. The bus bar 260 shown in FIG. 10 is formed by closely contacting two flat metal plates 262 and 264. The base side terminal portion is electrically connected to the terminal of the capacitor 200, and the base side is potted and fixed to the capacitor 200. However, when this mode is adopted, there is a risk that the vicinity of the tips of both metal plates 262 and 264 may be slightly opened due to tolerances. For this reason, in order to facilitate the assembly, it is necessary to make the gap with the plate-like bus bar 226 of the assembly destination a little wider. As a result, when fastening with bolts is performed, the amount of bending of the bus bar 260 increases, and a large force is exerted on the resin of the root portion 266. In addition, when the two metal plates 262 and 264 are brought into close contact by fastening with bolts, a force to open the two metal plates 262 and 264 also acts on the base portion 266 side to compress the surrounding resin. Become. Thus, in the vicinity of the root portion 266 of the metal plates 262 and 264, as in the vicinity of the root portion 272 of the bus bar 270 shown in FIG. 11, a large force acts on the resin at the same location, so that resin cracking is likely to occur.

It is the schematic which shows the structural example concerning the 1st aspect of the bus bar used for an electric vehicle. It is a perspective view of the bus bar shown in FIG. It is the schematic which shows the structural example of the bus-bar concerning a 2nd aspect. It is the schematic which shows the structural example of the bus bar concerning a 3rd aspect. FIG. 5 is a partial perspective view of the bus bar shown in FIG. 4. It is the schematic which shows the structural example of the bus-bar concerning a 4th aspect. It is a figure which shows the state after performing bolting in FIG. It is the schematic which shows the structural example of the bus-bar concerning a 5th aspect. It is a figure which shows the state after bolting in FIG. It is a figure which shows the structure of the bus bar used as a reference example. It is a figure which shows the structure of the bus bar used as a reference example.

Explanation of symbols

  10, 40, 50, 209, 239, 260, 270 Bus bar, 12, 14, 42, 44 Curved portion, 16, 18 Terminal portion, 20 Bolt hole, 22 Slotted hole, 24 region, 30 Root portion, 52, 56 Plate Shaped part, 54 metal wire bundle part, 200 capacitor, 204 boost converter, 210, 240 vent structure bus bar, 212, 214, 242, 244, 262, 264 metal plate, 216, 246 vent part, 220, 226 plate shaped bus bar, 222 , 228 volts, 224 terminals, 230, 266, 272 Root portion, 232 Contact portion.

Claims (6)

A bus bar formed using a conductor having two terminal parts and a main body part connecting the terminal parts,
One end side of the main body is a fixed area fixed by the resin filled in the surroundings
A bus bar characterized in that a deformable structure that is easily bent and deformed is provided in a non-fixed area of the main body. The bus bar according to claim 1,
A bus bar characterized in that the deformable structure is a vent structure. The bus bar according to claim 1 or 2,
The deformable structure is a bus bar having a structure in which a plurality of conductors are arranged to face each other. The bus bar according to claim 3,
The bus bar, wherein the plurality of conductors extend to a fixed area. The bus bar according to claim 1,
The non-fixed area side terminal part has a structure fastened to an external terminal by a bolt. A first device;
A second device;
The bus bar according to any one of claims 1 to 5,
With
The bus bar has a fixed area side terminal portion electrically connected to a terminal of the first device, and the fixed area is fixed to the first device by a resin filled around the non-fixed area side terminal portion. An electrical circuit system, wherein the electrical circuit system is electrically connected to a terminal of a second device.

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