Electric vehicle and power supply structure

Abstract

To realize both of error arrangement of a wiring and suppression of an operation deterioration during connection in an electric vehicle having a wiring connected to a bus bar.SOLUTION: An motorcycle includes: a first bus bar 72A connected to a positive electrode side wiring 81; a second bus bar 72B connected to a negative electrode side wiring 84; a first bolt 76 having a first shaft part 76a with a first calling diameter and a first head part 76b that is adopted to a tool with a predetermined size, which fastens the positive electrode side wiring 81 to the first bus bar 72A; a second bolt 77 having a second shaft part 77a with a second calling diameter that is different from the first calling diameter and a second head part 77b that is adopted to the tool with the predetermined size, which fastens the negative electrode side wiring 84 to the second bus bar 72B. The positive electrode side wiring 81 comprises a first terminal 82 that having a first insertion hole 82a into which the first shaft part 76a is inserted. The negative electrode side wiring 84 comprises a second terminal 85 having a second insertion hole 85a into which the second shaft part 77a is inserted and which is formed so as to disable the insertion of the first shaft part 76a.SELECTED DRAWING: Figure 9

Description

[Technical field]

[0001] The present invention relates to an electric vehicle and a power supply structure. [Background technology]

[0002] In an electric vehicle using a motor as a drive source, positive and negative wirings through which a large current flows are provided in a power supply structure between a battery and the motor. If these wirings are connected incorrectly to the correct connection destination of the bus bar, malfunction or failure may occur. For this reason, a mechanism for avoiding incorrect wiring may be provided in conventional power supply structures (see, for example, Patent Document 1). Patent Document 1 discloses a configuration in which the diameter of the bolts differs for each connector in an electric cable connection structure in which the connectors of the electric cables are fixed to a terminal block provided on a housing of an electric device with bolts. With this configuration, if the connector of the electric cable is incorrectly placed on the terminal block, the terminal of the terminal block and the connector of the electric cable cannot be connected with the bolts, and therefore incorrect wiring can be prevented. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-053276 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, if different bolts are used for each wire, the multiple wires cannot be connected to the bus bar with a common tool. Therefore, in electric vehicles and power supply structures, there is a problem in preventing incorrect assembly of the wires to the bus bar while suppressing a decrease in workability when connecting the wires to the bus bar.

[0005] Therefore, an object of the present invention is to prevent incorrect assembly of wiring and suppress a decrease in workability when connecting wiring in an electric vehicle and power supply structure having wiring connected to a bus bar. [Means for solving the problem]

[0006] An electric vehicle according to a first aspect of the present invention includes a motor, a battery (50A, 50B) that stores power for driving the motor, an inverter (53) that converts DC power supplied from the battery (50A, 50B) into AC power and supplies the AC power to the motor, a positive electrode side wiring (81) and a negative electrode side wiring (84) that electrically connect the battery (50A, 50B) and the inverter (53), a first bus bar (72A) connected to a first wiring (81) of the positive electrode side wiring (81) and the negative electrode side wiring (84), a second bus bar (72B) connected to a second wiring (84) of the other of the positive electrode side wiring (81) and the negative electrode side wiring (84), and a first shaft portion (76a) having a first nominal diameter. a first bolt (76) having a first head (76b) that fits a tool of a predetermined size and fastens the first wiring (81) to the first bus bar (72A), and a second bolt (77) having a second shank (77a) of a second nominal diameter different from the first nominal diameter and a second head (77b) that fits a tool of the predetermined size and fastens the second wiring (84) to the second bus bar (72B), wherein the first wiring (81) comprises a first terminal (82) having a first insertion hole (82a) through which the first shank (76a) is inserted, and the second wiring (84) comprises a second terminal (85) having a second insertion hole (85a) through which the second shank (77a) is inserted and formed so that the first shank (76a) cannot be inserted.

[0007] According to the first aspect, the first bolt is restricted from being combined with the second terminal of the second wiring. This makes it possible to prevent the second terminal of the second wiring from being fastened by the first bolt to a first bus bar that is not a correct connection destination. This makes it possible to prevent erroneous assembly of the first wiring and the second wiring. In addition, since the first head of the first bolt and the second head of the second bolt fit a tool of the same size, the operation of fastening the first wiring to the first bus bar with the first bolt and the operation of fastening the second wiring to the second bus bar with the second bolt can be performed using the same tool. This makes it possible to prevent a decrease in workability when connecting the bus bar and the wiring.

[0008] An electric vehicle according to a second aspect of the present invention is the electric vehicle according to the first aspect, wherein the first bus bar (72A) has a first fastening hole (72Ac) through which the first shaft portion (76a) is inserted, and the second bus bar (72B) has a second fastening hole (72Bc) through which the second shaft portion (77a) is inserted and which is formed so that the first shaft portion (76a) cannot be inserted.

[0009] According to the second aspect, the combination of the first bolt with the second bus bar is restricted. This makes it possible to prevent the first terminal of the first wiring combined with the first bolt from being fastened by the first bolt to a second bus bar that is not a correct connection destination. This makes it possible to prevent erroneous combination of the first wiring and the second wiring.

[0010] An electric vehicle according to a third aspect of the present invention may be the electric vehicle according to the first or second aspect, further comprising: a support body (61) supporting the first bus bar (72A) and the second bus bar (72B); a first nut (74A) screwed onto the first shaft portion (76a) and held by the support body (61) in a state not screwed onto the first shaft portion (76a); and a second nut (74B) screwed onto the second shaft portion (77a) and held by the support body (61) in a state not screwed onto the second shaft portion (77a).

[0011] According to the third aspect, since the first nominal diameter and the second nominal diameter are different, the first bolt cannot be screwed into the second nut, and the second bolt cannot be screwed into the first nut. Therefore, the first bolt cannot be screwed into the second nut and combined with the second bus bar, and the second bolt cannot be screwed into the first nut and combined with the first bus bar. This prevents the first terminal of the first wiring combined with the first bolt from being fastened by the first bolt to a second bus bar that is not a correct connection destination. Also, the second terminal of the second wiring combined with the second bolt from being fastened by the second bolt to a first bus bar that is not a correct connection destination. Therefore, it is possible to prevent the first wiring and the second wiring from being erroneously assembled.

[0012] An electric vehicle according to a fourth aspect of the present invention is an electric vehicle according to any one of the first to third aspects described above, further comprising a fuse (70A, 70B) arranged below the battery (50A, 50B), and one of the first bus bar (72A) and the second bus bar (72B) may have a wiring connection surface (72Ae) facing in the vehicle width direction and connected to one of the first terminal (82) and the second terminal (85), and a fuse connection surface (72Ad) facing in the vertical direction and connected to the fuse (70A, 70B).

[0013] According to the fourth aspect, the connection portion between one bus bar and the wiring can be disposed on the outer side in the vehicle width direction below the battery, thereby improving workability when connecting the bus bar and the wiring.

[0014] An electric vehicle according to a fifth aspect of the present invention is the electric vehicle according to the fourth aspect, wherein the fuse (70A, 70B) is formed in a cylindrical shape extending in the vehicle width direction.

[0015] According to the fifth aspect, a pair of terminals of the fuse are arranged in a distributed manner in the vehicle width direction, so that the first wiring or the second wiring connected to the wiring connection surface can be prevented from coming into contact with the fuse in a manner that would short-circuit both ends of the fuse.

[0016] An electric vehicle according to a sixth aspect of the present invention is the electric vehicle according to the fifth aspect, wherein the fuses (70A, 70B) are provided in a plurality of parts in a direction perpendicular to the vehicle width direction.

[0017] According to the sixth aspect, since the plurality of cylindrical fuses are arranged in a direction perpendicular to the vehicle width direction with their axial directions aligned, it is possible to reduce the area occupied by the fuses in the vehicle width direction.

[0018] An electric vehicle according to a seventh aspect of the present invention is the electric vehicle according to the sixth aspect, wherein the fuse connection surface (72Ad) extends along the fore-and-aft direction of the vehicle and is connected to the plurality of fuses (70A, 70B).

[0019] According to the seventh aspect, a plurality of fuses can be connected together to a fuse connection surface having a simple shape, which prevents one of the bus bars connected to the fuses from having a complex shape and thus prevents the area occupied by the one of the bus bars from increasing.

[0020] An electric vehicle according to an eighth aspect of the present invention is an electric vehicle according to any one of the fourth to seventh aspects, further comprising a support (61) that supports the fuses (70A, 70B) and the one bus bar (72A), and fastening members (B1, B2) that fasten the fuses (70A, 70B) and the one bus bar (72A) together to the support (61).

[0021] According to the eighth aspect, it is possible to improve the work efficiency when attaching the fuse and the one bus bar to the support, as compared with a configuration in which the fuse and the one bus bar are fastened separately to the support.

[0022] An electric vehicle according to a ninth aspect of the present invention is the electric vehicle according to the eighth aspect, further comprising a nut (74A, 74B) screwed onto one of the first shaft portion (76a) and the second shaft portion (77a), wherein the support (61) has a nut insertion portion (68A, 68B) into which the nut (74A, 74B) is inserted, and one of the first bus bar (72A) and the second bus bar (72B) prevents the nut (74A, 74B) from falling off the nut insertion portion (68A, 68B).

[0023] According to the ninth aspect, since there is no need to separately provide a member for preventing the nut from falling off the nut insertion portion, it is possible to reduce the number of parts in a configuration in which the nut is held by the support body.

[0024] An electric vehicle according to a tenth aspect of the present invention is an electric vehicle according to any one of the fourth to eighth aspects, wherein the electric vehicle is a two-wheeled vehicle, and the wiring connection surface (72Ae) faces toward the right side of the vehicle.

[0025] According to the tenth aspect, when the vehicle body is raised using the side stand provided on the left side of the motorcycle, the right side of the vehicle body faces slightly upward, thereby improving workability when connecting the bus bar and wiring on the outer side in the vehicle width direction.

[0026] A power supply structure according to an eleventh aspect of the present invention includes a first wiring (81) and a second wiring (84), a first bus bar (72A) connected to the first wiring (81), a second bus bar (72B) connected to the second wiring (84), a first shaft portion (76a) having a first nominal diameter, and a first head portion (76b) adapted to a tool of a predetermined size, and a first bolt (76) for fastening the first wiring (81) to the first bus bar (72A), and a second shaft portion (77a) having a second nominal diameter different from the first nominal diameter. ), and a second bolt (77) having a second head (77b) that fits a tool of the specified size and fastens the second wiring (84) to the second bus bar (72B), wherein the first wiring (81) comprises a first terminal (82) having a first insertion hole (82a) through which the first shaft portion (76a) is inserted, and the second wiring (84) comprises a second terminal (85) through which the second shaft portion (77a) is inserted and having a second insertion hole (85a) formed so that the first shaft portion (76a) cannot be inserted.

[0027] According to the eleventh aspect, the first bolt is restricted from being combined with the second terminal of the second wiring. This makes it possible to prevent the second terminal of the second wiring from being fastened by the first bolt to a first bus bar that is not a correct connection destination. This makes it possible to prevent erroneous assembly of the first wiring and the second wiring. In addition, since the first head of the first bolt and the second head of the second bolt fit a tool of the same size, the operation of fastening the first wiring to the first bus bar with the first bolt and the operation of fastening the second wiring to the second bus bar with the second bolt can be performed using the same tool. This makes it possible to prevent a decrease in workability when connecting the bus bar and the wiring. Effect of the Invention

[0028] According to the present invention, in an electric vehicle and a power supply structure having wiring connected to a bus bar, it is possible to prevent incorrect assembly of wiring and suppress a decrease in workability when connecting the wiring. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a right side view of a motorcycle according to an embodiment. [Diagram 2] FIG. 2 is a circuit block diagram of an electrical system in the motorcycle according to the embodiment. [Diagram 3] FIG. 4 is a bottom view of the junction box and its surroundings. [Figure 4] FIG. 2 is a perspective view of the junction box alone as viewed from below. [Diagram 5] FIG. 2 is a perspective view of the junction box alone as viewed from above. [Figure 6] FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 5. [Figure 8] FIG. 4 is a right side view of the junction box alone. [Figure 9] FIG. 4 is a right side view of the junction box and its surroundings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the same reference numerals are used for components having the same or similar functions. Then, duplicated descriptions of those components may be omitted. In addition, directions such as front / rear, up / down, left / right, etc. in the following description are the same as directions in a vehicle described below. That is, the up / down direction coincides with the vertical direction, and the left / right direction coincides with the vehicle width direction. In addition, in the drawings used in the following description, the arrow UP indicates upward, the arrow FR indicates forward, and the arrow LH indicates left, respectively.

[0031] FIG. 1 is a right side view of a motorcycle according to an embodiment. As shown in Fig. 1, the motorcycle 1 of this embodiment is a scooter-type saddle-ride electric vehicle having a step floor 5 on which a rider seated on a seat 4 places his / her feet. The motorcycle 1 includes a front wheel 2, a rear wheel 3, a body frame 20, a vehicle cover 30, and a unit swing type rear suspension 40 including a power unit 41.

[0032] The front wheel 2 is journalled at the lower ends of a pair of left and right front forks 11 of a front wheel suspension 10. The front wheel suspension 10 is supported in a steerable manner at the front end of a body frame 20. A steering bar handle is attached to the upper part of the front wheel suspension 10.

[0033] The body frame 20 includes a head pipe 21, a down frame 22, a lower frame 23, and a rear frame 24, which are joined together by welding or the like. The head pipe 21 is disposed at the front end of the body frame 20. The down frame 22 is joined to the head pipe 21. The down frame 22 extends downward from the head pipe 21. A pair of lower frames 23 are provided on the left and right. The lower frames 23 are joined to lower ends of the down frames 22. The lower frames 23 extend rearward from the lower ends of the down frames 22. A pair of rear frames 24 are provided on the left and right. The rear frames 24 are joined to rear ends of the lower frames 23. The rear frames 24 extend upward and rearward from the rear ends of the pair of lower frames 23. The pair of rear frames 24 support the seat 4. A bracket (not shown) protruding rearward is provided at a front lower portion of each rear frame 24. However, the brackets may protrude rearward from the rear of the lower frame 23. The pair of brackets support a rear suspension 40 via a pivot shaft. The body frame 20 supports a side stand that is stored on the left side of the vehicle and can protrude.

[0034] The vehicle cover 30 is composed of a plurality of exterior panels. The vehicle cover 30 has a front cover 31, a handle cover 32, a leg shield 33, a lower cover 34, and a rear cover 35. The front cover 31 is provided so as to cover the head pipe 21. The handle cover 32 is provided so as to cover the center part of the bar handle. The leg shield 33 is provided so as to cover the down frame 22 and to cover the legs of the driver from the front. The lower cover 34 is provided so as to cover the lower frame 23. A step floor 5 on which the passenger places his / her feet is formed on the upper surface of the lower cover 34. The rear cover 35 extends rearward and upward from the lower cover 34. The rear cover 35 is provided so as to cover the rear frame 24 from the front and from the outside in the vehicle width direction. A seat 4 is disposed on the upper part of the rear cover 35. In addition, the multiple exterior panels that make up the vehicle cover 30 do not need to be divided into the above-mentioned parts, and may be arranged so as to straddle the boundaries between the parts, or each part may be composed of multiple exterior panels.

[0035] The rear suspension 40 includes a power unit 41 and a rear cushion interposed between the body frame 20 and the power unit 41. The power unit 41 is a swing-type power unit that integrates a traveling motor that is a drive source arranged on the left side of the rear wheel 3, a swing frame that supports the motor, and a power transmission mechanism that reduces the output of the motor and transmits it to the axle of the rear wheel 3. The power unit 41 is formed in an L-shape in a plan view, and is arranged from the space in front of the rear wheel 3 to the space to the left. The power unit 41 is supported on the body frame 20 via a pivot shaft so as to be able to swing up and down.

[0036] The motorcycle 1 further includes batteries 50A, 50B, a power control unit 53, and a junction box 60. Hereinafter, the power control unit will be referred to as the power control unit 53.

[0037] The batteries 50A, 50B are power sources for the power unit 41. The batteries 50A, 50B store power for driving the motor. The batteries 50A, 50B are detachably housed below the seat 4. In this embodiment, the batteries 50A, 50B are a first battery 50A and a second battery 50B. The first battery 50A and the second battery 50B are arranged side by side in the front-rear direction. The first battery 50A is arranged in front of the second battery 50B. However, the positional relationship between the first battery 50A and the second battery 50B may be reversed.

[0038] The PCU 53 converts electric power exchanged between the batteries 50A, 50B and the motor. The PCU 53 is disposed below the step floor 5.

[0039] The junction box 60 relays wiring connected to the batteries 50A, 50B, the PCU 53, etc. The junction box 60 is disposed below the batteries 50A, 50B. The junction box 60 is covered from the outside in the vehicle width direction by the lower cover 34 or the rear cover 35.

[0040] FIG. 2 is a circuit block diagram of an electrical system in the motorcycle according to the embodiment. As shown in FIG. 2, in addition to the first battery 50A, the second battery 50B and the PCU 53, the motorcycle 1 further includes a DC-DC converter 55, a contactor 57, a relay 59, a first fuse 70A and a second fuse 70B.

[0041] The first battery 50A and the second battery 50B are connected in series to each other via a contactor 57. The first battery 50A is connected to the positive electrode of the second battery 50B. In the following description, the first battery 50A and the second battery 50B connected in series to each other are referred to as a battery set 51. The battery set 51 functions as a single power source by closing the contactor 57.

[0042] The PCU 53 and the DC-DC converter 55 are each connected to the battery set 51. The PCU 53 and the DC-DC converter 55 are connected in parallel to each other. The PCU 53 converts the DC power supplied from the batteries 50A, 50B into three-phase AC power and supplies it to the motor, and also converts the AC power supplied from the motor into DC power and supplies it to the batteries 50A, 50B. The PCU 53 may convert the voltage of the power exchanged between the batteries 50A, 50B and the motor. The PCU 53 is realized by an electronic circuit including an inverter and the like. The DC-DC converter 55 converts the voltage of the DC power supplied from the batteries 50A, 50B and supplies it to various electrical components of the motorcycle 1.

[0043] The relay 59 is connected in parallel to the second battery 50B and the contactor 57. By opening the contactor 57 and closing the relay 59, the PCU 53 and the DC-DC converter 55 are connected to only the first battery 50A among the first battery 50A and the second battery 50B. When the smoothing capacitor included in the PCU 53 is charged, for example when the PCU 53 is started, the relay 59 is first closed to connect only the first battery 50A to the PCU 53 and apply the output voltage of the first battery 50A to the smoothing capacitor. By opening the relay 59 in a state in which the smoothing capacitor is charged by the first battery 50A, the smoothing capacitor is charged at a higher voltage by the first battery 50A and the second battery 50B. By providing the relay 59 in this way, the voltage applied to the smoothing capacitor can be increased as the charge amount of the smoothing capacitor in the PCU 53 increases, so that a smoothing capacitor with a relatively low withstand voltage can be used.

[0044] The first fuse 70A is connected between the first battery 50A and the PCU 53 and the DC-DC converter 55. The first fuse 70A is connected in series with each of the first battery 50A, the PCU 53, and the DC-DC converter 55. The first fuse 70A is provided in the junction box 60.

[0045] The second fuse 70B has a smaller rated current than the first fuse 70A. The second fuse 70B is connected between the first fuse 70A and the DC-DC converter 55. The second fuse 70B is connected in series with the first fuse 70A and the DC-DC converter 55, and is connected in parallel with the PCU 53 together with the DC-DC converter 55. The second fuse 70B is provided in the junction box 60.

[0046] Fig. 3 is a bottom view of the junction box and its surroundings, Fig. 4 is a perspective view of the junction box alone as viewed from below, and Fig. 5 is a perspective view of the junction box alone as viewed from above. As shown in Figures 3 to 5, the junction box 60 includes a support 61, a first fuse 70A, a second fuse 70B, a first bus bar 72A, a second bus bar 72B, a first nut 74A, and a second nut 74B.

[0047] The support body 61 forms the outer shape of the junction box 60. The support body 61 is formed in a rectangular parallelepiped shape that is flat in the vertical direction. The support body 61 is arranged with six side surfaces facing up, down, left, right, front, and back. The support body 61 is formed with fuse holding portions 63A, 63B and bus bar holding portions 66A, 66B.

[0048] The fuse holding portions 63A, 63B are a first fuse holding portion 63A in which the first fuse 70A is disposed, and a second fuse holding portion 63B in which the second fuse 70B is disposed. The fuse holding portions 63A, 63B are each a recess that opens downward. The fuse holding portions 63A, 63B each extend in the vehicle width direction. The first fuse holding portion 63A and the second fuse holding portion 63B are aligned in the front-rear direction.

[0049] The first fuse 70A and the second fuse 70B are each formed in a cylindrical shape and are arranged to extend along the vehicle width direction. The first fuse 70A and the second fuse 70B are arranged parallel to each other. The first fuse 70A and the second fuse 70B are arranged in the front-rear direction so as to overlap each other when viewed from the front-rear direction. Both ends of each fuse 70A, 70B are flat terminals having a thickness in the up-down direction. The terminals of each fuse 70A, 70B are each fastened to the support body 61 by a bolt. Specifically, one end (right end) of each fuse 70A, 70B is fastened together with the first bus bar 72A to the support body 61 by the bolts B1, B2, the other end (left end) of the first fuse 70A is fastened together with the wiring 90 to the support body 61 by the bolt B3, and the other end (left end) of the second fuse 70B is fastened together with the wiring 91 to the support body 61 by the bolt B4.

[0050] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 3 and 6, the first fuse holding portion 63A is provided with a claw 64A that holds the first fuse 70A. The claw 64A protrudes from the bottom surface of the first fuse holding portion 63A and is provided so as to sandwich the first fuse 70A. The second fuse holding portion 63B is provided with a claw 64B that holds the second fuse 70B. The claw 64B protrudes from the bottom surface of the second fuse holding portion 63B and is provided so as to sandwich the second fuse 70B.

[0051] As shown in FIGS. 4 and 5, busbar holding portions 66A, 66B are first busbar holding portion 66A on which first busbar 72A is arranged, and second busbar holding portion 66B on which second busbar 72B is arranged.

[0052] As shown in Fig. 3 to Fig. 5, the first bus bar 72A is connected to the first fuse 70A and the second fuse 70B. The first bus bar 72A forms a current path between the first fuse 70A and the second fuse 70B. The first bus bar 72A is connected to a positive electrode side wiring 81 described later, and forms a current path between the first fuse 70A and the PCU 53 together with the positive electrode side wiring 81 (see Fig. 2 and Fig. 3). The first bus bar 72A includes a lower surface portion 72Aa extending in a direction perpendicular to the up-down direction and disposed along the lower surface of the support body 61, and a side surface portion 72Ab extending in a direction perpendicular to the vehicle width direction and disposed along a side surface (right side surface) of the support body 61 facing the vehicle width direction.

[0053] As shown in FIG. 4, the lower surface portion 72Aa is flat with the front and back surfaces facing the up-down direction. The lower surface portion 72Aa is connected to the right terminals of the first fuse 70A and the second fuse 70B. The lower surface of the lower surface portion 72Aa is a fuse connection surface 72Ad that faces downward and overlaps with the right terminals of the first fuse 70A and the second fuse 70B. The lower surface portion 72Aa is disposed so as to be sandwiched between the terminal of the first fuse 70A and the support body 61, and is fastened together with the terminal of the first fuse 70A to the support body 61 by a bolt B1. The lower surface portion 72Aa is disposed so as to be sandwiched between the terminal of the second fuse 70B and the support body 61, and is fastened together with the terminal of the second fuse 70B to the support body 61 by a bolt B2.

[0054] As shown in FIG. 5, the side portion 72Ab is flat with its front and back surfaces facing the vehicle width direction. The side portion 72Ab is connected to the lower surface portion 72Aa via a bent portion. The side portion 72Ab extends upward from the right edge of the lower surface portion 72Aa. A first fastening hole 72Ac is formed in the side portion 72Ab, through which a first bolt 76 described later is inserted. The side portion 72Ab is connected to a first terminal 82 of the positive electrode side wiring 81 (see FIG. 9). The right surface of the side portion 72Ab is a wiring connection surface 72Ae that faces outward in the vehicle width direction and overlaps with the first terminal 82 of the positive electrode side wiring 81.

[0055] 3 to 5, the second bus bar 72B is connected to a negative electrode side wiring 84, which will be described later. The second bus bar 72B is electrically connected to the PCU 53 via the negative electrode side wiring 84 (also see FIG. 2). The second bus bar 72B is disposed rearward of the first bus bar 72A. The second bus bar 72B includes a lower surface portion 72Ba that extends in a direction perpendicular to the up-down direction and is disposed along the lower surface of the support body 61, and a side surface portion 72Bb that extends in a direction perpendicular to the vehicle width direction and is disposed along the side surface (right side surface) of the support body 61 facing in the vehicle width direction.

[0056] As shown in Fig. 4, the lower surface portion 72Ba is arranged side by side with the lower surface portion 72Aa of the first bus bar 72A in the front-rear direction. The lower surface portion 72Ba is flat with its front and back surfaces facing the up-down direction. As shown in Fig. 3, the lower surface portion 72Ba is arranged so as to be sandwiched between the terminals of the wiring 92, 93 and the support body 61, and is fastened together with the terminals of the wiring 92, 93 to the support body 61 by a bolt B5. The second bus bar 72B is connected to the DC-DC converter 55, the relay 59, and the negative electrode of the second battery 50B via the wiring 92 or the wiring 93 (also see Fig. 2).

[0057] As shown in FIG. 5, the side portion 72Bb is flat with its front and back surfaces facing the vehicle width direction. The side portion 72Bb is connected to the lower surface portion 72Ba via a bent portion. The side portion 72Bb extends upward from the right edge of the lower surface portion 72Ba. The side portion 72Bb is arranged in line with the side portion 72Ab of the first bus bar 72A in the front-rear direction. The side portion 72Bb is formed with a second fastening hole 72Bc through which a second bolt 77 described later is inserted. The side portion 72Bb is connected to the second terminal 85 of the negative electrode side wiring 84 (see FIG. 9). The right surface of the side portion 72Bb is a wiring connection surface 72Be that faces outward in the vehicle width direction and overlaps with the second terminal 85 of the negative electrode side wiring 84.

[0058] As shown in FIG. 3, the first busbar holding portion 66A receives the first busbar 72A moving in parallel from below the support 61 and approaching the support 61. The first busbar holding portion 66A includes a first holding portion 66Aa on which a lower surface portion 72Aa of the first busbar 72A is disposed, and a second holding portion 66Ab on which a side surface portion 72Ab of the first busbar 72A is disposed. The first holding portion 66Aa is formed in a concave shape that opens downward. The first holding portion 66Aa receives the lower surface portion 72Aa so as to restrict displacement in a direction perpendicular to the up-down direction. The second holding portion 66Ab is formed in a concave shape that opens to the right side (see FIG. 5). The second holding portion 66Ab is in communication with the first holding portion 66Aa. The second holding portion 66Ab receives the side surface portion 72Ab so as to expose the side surface portion 72Ab toward the right space of the junction box 60. The first terminal 82 of the positive electrode side wiring 81 is inserted into the second holding portion 66Ab from the outer side (right side) in the vehicle width direction.

[0059] The second busbar holding portion 66B receives the second busbar 72B moving in parallel from below the support 61 and approaching the support 61. The second busbar holding portion 66B includes a first holding portion 66Ba on which a lower surface portion 72Ba of the second busbar 72B is disposed, and a second holding portion 66Bb on which a side surface portion 72Bb of the second busbar 72B is disposed. The first holding portion 66Ba is formed in a concave shape that opens downward. The first holding portion 66Ba receives the lower surface portion 72Ba so as to restrict displacement in a direction perpendicular to the up-down direction. The second holding portion 66Bb is formed in a concave shape that opens to the right side (see FIG. 5). The second holding portion 66Bb is in communication with the first holding portion 66Ba. The second holding portion 66Bb receives the side surface portion 72Bb so as to expose the side surface portion 72Bb toward the right space of the junction box 60.

[0060] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. As shown in FIGS. 5 and 7, the support 61 is formed with a first nut insertion portion 68A in which the first nut 74A is disposed, and a second nut insertion portion 68B in which the second nut 74B is disposed.

[0061] The first nut insertion portion 68A is a recess that opens downward. The first nut insertion portion 68A is located on the left side of the second holding portion 66Ab of the first bus bar holding portion 66A, and opens to the right through the second holding portion 66Ab. The first nut insertion portion 68A allows the first nut 74A to be inserted from below or the right side.

[0062] The first nut 74A is disposed with the axis of the female thread aligned along the vehicle width direction. The first nut 74A is covered from above by the lower surface portion 72Aa of the first bus bar 72A, and is covered from the right side by the side surface portion 72Ab of the first bus bar 72A. As a result, the first nut 74A is prevented from falling off the first nut insertion portion 68A by the first bus bar 72A, and is held in the first nut insertion portion 68A without being screwed into the first bolt 76. The first nut 74A is non-rotatably engaged with at least one of the first nut insertion portion 68A and the first bus bar 72A.

[0063] The second nut insertion portion 68B is a recess that opens downward, similar to the first nut insertion portion 68A. The second nut insertion portion 68B is formed behind the first nut insertion portion 68A. The second nut insertion portion 68B is located on the left side of the second holding portion 66Bb of the second bus bar holding portion 66B, and opens to the right through the second holding portion 66Bb. The second nut insertion portion 68B allows the second nut 74B to be inserted from below or from the right side.

[0064] The second nut 74B is disposed with the axis of the female thread aligned along the vehicle width direction. The second nut 74B is covered from above by the lower surface portion 72Ba of the second bus bar 72B, and is covered from the right side by the side surface portion 72Bb of the second bus bar 72B. As a result, the second nut 74B is prevented from falling off the second nut insertion portion 68B by the second bus bar 72B, and is held in the second nut insertion portion 68B without being screwed into the second bolt 77. The second nut 74B is non-rotatably engaged with at least one of the second nut insertion portion 68B and the second bus bar 72B.

[0065] Fig. 8 is a right side view of the junction box alone, and Fig. 9 is a right side view of the junction box and its surroundings. As shown in FIG. 8 and FIG. 9, the first nut 74A is screwed onto the first bolt 76. The first bolt 76 and the first nut 74A fasten the first terminal 82 of the positive electrode side wiring 81 to the side surface portion 72Ab of the first busbar 72A. The first bolt 76 is a hexagonal bolt. The first bolt 76 has a first shaft portion 76a with a first nominal diameter and a first head portion 76b that fits a tool of a predetermined size. That is, the nominal diameter of the first nut 74A is the first nominal diameter. The first shaft portion 76a is inserted into the first fastening hole 72Ac of the first busbar 72A.

[0066] The second nut 74B is screwed into the second bolt 77. The second bolt 77 and the second nut 74B fasten the second terminal 85 of the negative electrode side wiring 84 to the side surface portion 72Bb of the second bus bar 72B. The second bolt 77 is a hexagonal bolt. The second bolt 77 has a second shaft portion 77a having a second nominal diameter different from the first nominal diameter and a second head portion 77b that fits a tool of a predetermined size. That is, the nominal diameter of the second nut 74B is the second nominal diameter. In this embodiment, the second nominal diameter is smaller than the first nominal diameter. The second shaft portion 77a is inserted into the second fastening hole 72Bc of the second bus bar 72B. The second fastening hole 72Bc is smaller than the first fastening hole 72Ac of the first bus bar 72A and is formed so that the first shaft portion 76a having a larger diameter than the second shaft portion 77a cannot be inserted therethrough.

[0067] The first head 76b and the second head 77b each have the same width across flats so that they are compatible with a tool of a predetermined size. This allows the first bolt 76 and the second bolt 77 to be tightened using a common tool (wrench). The tool of a predetermined size does not include a tool such as an adjustable wrench whose compatibility range can be changed. In other words, a tool of a predetermined size is one that is compatible with only one type of bolt. The bolt may be a hexagon socket bolt. If the bolt is a hexagon socket bolt, the first head and the second head only need to have the same hexagon socket width across flats so that the width across flats of the hexagonal bar wrench used to tighten them is the same.

[0068] As shown in Fig. 3, a plurality of wires forming the current path shown in Fig. 2 are connected to the junction box 60. The plurality of wires include a positive electrode side wire 81 and a negative electrode side wire 84. The positive electrode side wire 81 and the negative electrode side wire 84 electrically connect the battery set 51 and the DC-DC converter 55. A potential difference is generated between the positive electrode side wire 81 and the negative electrode side wire 84. The positive electrode side wire 81 and the negative electrode side wire 84 may be bundled together as a main harness.

[0069] As shown in FIG. 3 and FIG. 9, the positive electrode side wiring 81 is connected to the side surface portion 72Ab of the first bus bar 72A. The positive electrode side wiring 81 electrically connects the first fuse 70A and the PCU 53. That is, the positive electrode side wiring 81 forms a current path between the positive electrode of the battery set 51 and the PCU 53. The positive electrode side wiring 81 has a first terminal 82 fastened to the junction box 60. The first terminal 82 has a first insertion hole 82a through which the first shaft portion 76a of the first bolt 76 is inserted. The positive electrode side wiring 81 is fastened to the first bus bar 72A by the first bolt 76 and the first nut 74A in a state where it is sandwiched between the first head portion 76b of the first bolt 76 and the side surface portion 72Ab of the first bus bar 72A.

[0070] The negative electrode side wiring 84 is connected to the side surface portion 72Bb of the second bus bar 72B. The negative electrode side wiring 84 forms a current path between the negative electrode of the battery set 51 and the PCU 53. The negative electrode side wiring 84 has a second terminal 85 fastened to the junction box 60. The second terminal 85 has a second insertion hole 85a through which the second shaft portion 77a of the second bolt 77 is inserted. The second insertion hole 85a is formed so that the first shaft portion 76a having a larger diameter than the second shaft portion 77a cannot be inserted therethrough. The negative electrode side wiring 84 is fastened to the second bus bar 72B by the second bolt 77 and the second nut 74B while being sandwiched between the second head portion 77b of the second bolt 77 and the side surface portion 72Bb of the second bus bar 72B.

[0071] As described above, the motorcycle 1 and its power supply structure of this embodiment include the positive electrode side wiring 81 and the negative electrode side wiring 84 that electrically connect the battery set 51 and the PCU 53, the first bus bar 72A connected to the positive electrode side wiring 81, the second bus bar 72B connected to the negative electrode side wiring 84, the first bolt 76 having a first shaft portion 76a with a first nominal diameter and a first head portion 76b that fits a tool of a predetermined size and fastening the positive electrode side wiring 81 to the first bus bar 72A, and the second bolt 77 having a second shaft portion 77a with a second nominal diameter different from the first nominal diameter and a second head portion 77b that fits a tool of a predetermined size and fastening the negative electrode side wiring 84 to the second bus bar 72B. The positive electrode side wiring 81 includes a first terminal 82 having a first insertion hole 82a through which the first shaft portion 76a is inserted. The negative electrode side wiring 84 includes a second terminal 85 having a second insertion hole 85a through which the second shaft portion 77a is inserted and through which the first shaft portion 76a cannot be inserted. With this configuration, the first bolt 76 is restricted from being assembled with the second terminal 85 of the negative electrode side wiring 84. This makes it possible to prevent the second terminal 85 of the negative electrode side wiring 84 from being fastened by the first bolt 76 to the first bus bar 72A, which is not a correct connection destination. This makes it possible to prevent erroneous assembly of the positive electrode side wiring 81 and the negative electrode side wiring 84. In addition, since the first head 76b of the first bolt 76 and the second head 77b of the second bolt 77 fit a tool of the same size, the operation of fastening the positive electrode side wiring 81 to the first bus bar 72A by the first bolt 76 and the operation of fastening the negative electrode side wiring 84 to the second bus bar 72B by the second bolt 77 can be performed using the same tool. Therefore, deterioration in workability when connecting bus bars 72A, 72B and wirings 81, 84 can be suppressed.

[0072] The first busbar 72A has a first fastening hole 72Ac through which the first shaft portion 76a is inserted. The second busbar 72B has a second fastening hole 72Bc through which the second shaft portion 77a is inserted and which is formed so that the first shaft portion 76a cannot be inserted. This configuration restricts the first bolt 76 from being assembled to the second busbar 72B. This prevents the first terminal 82 of the positive electrode side wiring 81 assembled to the first bolt 76 from being fastened by the first bolt 76 to the second busbar 72B which is not the correct connection destination. This prevents the positive electrode side wiring 81 and the negative electrode side wiring 84 from being assembled incorrectly.

[0073] The motorcycle 1 further includes a first nut 74A that is screwed onto the first shaft portion 76a and is restricted from being displaced relative to the first bus bar 72A when not screwed onto the first shaft portion 76a, and a second nut 74B that is screwed onto the second shaft portion 77a and is restricted from being displaced relative to the second bus bar 72B when not screwed onto the second shaft portion 77a. According to this configuration, since the first nominal diameter and the second nominal diameter are different, the first bolt 76 cannot be screwed onto the second nut 74B, and the second bolt 77 cannot be screwed onto the first nut 74A. Therefore, it is restricted that the first bolt 76 is screwed onto the second nut 74B and assembled to the second bus bar 72B, and that the second bolt 77 is screwed onto the first nut 74A and assembled to the first bus bar 72A. This prevents the first terminal 82 of the positive wiring 81 combined with the first bolt 76 from being fastened to the second bus bar 72B, which is not the correct connection destination, by the first bolt 76. Also, the second terminal 85 of the negative wiring 84 combined with the second bolt 77 can be prevented from being fastened to the first bus bar 72A, which is not the correct connection destination, by the second bolt 77. This prevents the positive wiring 81 and the negative wiring 84 from being erroneously assembled.

[0074] The motorcycle 1 further includes fuses 70A, 70B disposed below the batteries 50A, 50B. The first bus bar 72A has a wiring connection surface 72Ae facing in the vehicle width direction and connected to a first terminal 82 of the positive electrode side wiring 81, and a lower surface portion 72Aa facing in the vertical direction and connected to the fuses 70A, 70B. With this configuration, the connection portion between one of the first bus bars 72A and the positive electrode side wiring 81 can be disposed on the outer side in the vehicle width direction below the batteries 50A, 50B, thereby improving the workability when connecting the first bus bar 72A and the positive electrode side wiring 81.

[0075] The fuses 70A, 70B are formed in a cylindrical shape extending in the vehicle width direction. With this configuration, the pair of terminals of each of the fuses 70A, 70B are arranged in the vehicle width direction, so that the positive electrode side wiring 81 connected to the side surface portion 72Ab of the first bus bar 72A can be prevented from contacting the fuses 70A, 70B in a manner that would short-circuit both ends of the fuses 70A, 70B.

[0076] The first fuse 70A and the second fuse 70B are provided in a direction perpendicular to the vehicle width direction. With this configuration, the multiple cylindrical fuses 70A, 70B are aligned in the direction perpendicular to the vehicle width direction with their axial directions aligned, which reduces the area occupied by the fuses 70A, 70B in the vehicle width direction.

[0077] The fuse connection surface 72Ad of the first bus bar 72A extends in the front-rear direction and is connected to the multiple fuses 70A, 70B. With this configuration, the multiple fuses 70A, 70B can be connected together to the simply shaped lower surface portion 72Aa. This prevents the shape of the first bus bar 72A connected to the fuses 70A, 70B from becoming complicated and prevents the area occupied by the first bus bar 72A from becoming larger.

[0078] Motorcycle 1 further includes support body 61 that supports fuses 70A, 70B and first bus bar 72A, and bolts B1, B2 that fasten fuses 70A, 70B and first bus bar 72A together to support body 61. This configuration improves the work efficiency when attaching fuses 70A, 70B and first bus bar 72A to support body 61, compared to a configuration in which the fuses and the first bus bar are individually fastened to the support body.

[0079] The motorcycle 1 further includes a first nut 74A screwed onto the first shaft portion 76a of the first bolt 76, and a second nut 74B screwed onto the second shaft portion 77a of the second bolt 77. The support 61 has a first nut insertion portion 68A into which the first nut 74A is inserted, and a second nut insertion portion 68B into which the second nut 74B is inserted. The first bus bar 72A prevents the first nut 74A from falling off from the first nut insertion portion 68A. The second bus bar 72B prevents the second nut 74B from falling off from the second nut insertion portion 68B. With this configuration, it is not necessary to separately provide a member that prevents the first nut 74A from falling off from the first nut insertion portion 68A and a member that prevents the second nut 74B from falling off from the second nut insertion portion 68B. Therefore, in a configuration in which the nuts 74A and 74B are held by the support 61, it is possible to reduce the number of parts.

[0080] Wiring connection surface 72Ae of first bus bar 72A faces the right side. With this configuration, when the vehicle body is stood upright using a side stand provided on the left side of motorcycle 1, the right side surface of the vehicle body faces slightly upward, improving the workability when connecting bus bars 72A, 72B and wiring 81, 84 at the outer portions in the vehicle width direction.

[0081] The present invention is not limited to the above-described embodiment explained with reference to the drawings, and various modifications are possible within the technical scope of the present invention. For example, although the present invention is applied to the motorcycle 1 in the above embodiment, the present invention may be applied to vehicles other than motorcycles. That is, the present invention may be applied to saddle-ride vehicles including motorcycles, three-wheeled vehicles, or four-wheeled vehicles such as buggies and ATVs (All Terrain Vehicles), and vehicles other than saddle-ride vehicles (passenger cars, buses, trucks, etc.).

[0082] In the above embodiment, the junction box 60 is disposed below the batteries 50A, 50B, but the position of the junction box is not particularly limited.

[0083] In the above embodiment, the first nominal diameter of the first bolt 76 is larger than the second nominal diameter of the second bolt 77, but is not limited to this configuration. In other words, the first nominal diameter of the first bolt may be smaller than the second nominal diameter of the second bolt.

[0084] In the above embodiment, the wiring connection surfaces of the bus bars 72A and 72B are arranged to face the right side, but the present invention is not limited to this configuration. For example, the wiring connection surfaces of the bus bars may be arranged to face the left side, downward, or rearward.

[0085] In the above embodiment, the second fastening hole 72Bc of the second bus bar 72B is formed so that the first bolt 76, which has a larger diameter than the second shaft portion 77a of the second bolt 77, cannot be inserted through the first shaft portion 76a. However, the first fastening hole of the first bus bar 72A and the second fastening hole of the second bus bar may be formed to be the same size so that the first shaft portion 76a can be inserted through the second fastening hole. Even in this case, as long as the nuts 74A, 74B are placed in predetermined positions when the bolts 76, 77 are attached, it is possible to prevent incorrect assembly of the positive electrode side wiring 81 and the negative electrode side wiring 84.

[0086] In the above embodiment, bolts 76, 77 are attached with nuts 74A, 74B held in advance by support body 61 of junction box 60. However, each nut may be configured to be screwed onto bolts 76, 77 that have been inserted in advance into the fastening holes of the bus bars. In this case, by forming the fastening hole of one bus bar so that the shank of one bolt cannot be inserted therethrough, it is possible to prevent the nut from being screwed onto the bolt when the bolt and bus bar are erroneously combined.

[0087] In addition, the components in the above-described embodiments can be replaced with well-known components as appropriate without departing from the spirit of the present invention. [Explanation of symbols]

[0088] 50A...first battery (battery) 50B...second battery (battery) 53...power control unit (inverter) 61...support 68A...first nut insertion portion (nut insertion portion) 68B...second nut insertion portion (nut insertion portion) 70A...first fuse (fuse) 70B...second fuse (fuse) 72A...first bus bar (one of the bus bars) 72Ac...first fastening hole 72Ad...fuse connection surface 72Ae...wiring connection surface 72B...second bus bar 72Bc...second fastening hole 74A...first nut (nut) 74B...second nut (nut) 76...first bolt 76a...first shaft portion 76b...first head portion 77...second bolt 77a...second shaft portion 77b...second head portion 81...positive wiring (first wiring) 82...first terminal 82a...First insertion hole 84...Negative electrode side wiring (second wiring) 85...Second terminal 85a...Second insertion hole B1, B2...Bolts (fastening members)

Claims

1. A motor; a battery (50A, 50B) for storing power for driving the motor; an inverter (53) that converts DC power supplied from the batteries (50A, 50B) into AC power and supplies the AC power to the motor; a positive electrode side wiring (81) and a negative electrode side wiring (84) electrically connecting the battery (50A, 50B) and the inverter (53); A first bus bar (72A) connected to a first wiring (81) of the positive electrode side wiring (81) and the negative electrode side wiring (84); A second bus bar (72B) connected to the other second wiring (84) of the positive electrode side wiring (81) and the negative electrode side wiring (84); a first bolt (76) having a first shaft portion (76a) with a first nominal diameter and a first head portion (76b) adapted to a tool of a predetermined size, and fastening the first wiring (81) to the first bus bar (72A); a second bolt (77) having a second shaft portion (77a) having a second nominal diameter different from the first nominal diameter and a second head portion (77b) adapted to a tool of the specified size, and fastening the second wiring (84) to the second bus bar (72B); Equipped with The first wiring (81) includes a first terminal (82) having a first insertion hole (82a) through which the first shaft portion (76a) is inserted, The second wiring (84) includes a second terminal (85) having a second insertion hole (85a) through which the second shaft portion (77a) is inserted and through which the first shaft portion (76a) cannot be inserted. Electric vehicle.

2. The first bus bar (72A) has a first fastening hole (72Ac) through which the first shaft portion (76a) is inserted, The second bus bar (72B) has a second fastening hole (72Bc) through which the second shaft portion (77a) is inserted and through which the first shaft portion (76a) cannot be inserted. The electric vehicle according to claim 1 .

3. A support (61) that supports the first bus bar (72A) and the second bus bar (72B); a first nut (74A) that is screwed onto the first shaft portion (76a) and is held by the support (61) in a state where it is not screwed onto the first shaft portion (76a); a second nut (74B) that is screwed onto the second shaft portion (77a) and is held by the support body (61) in a state where it is not screwed onto the second shaft portion (77a); The electric vehicle according to claim 1 or 2, further comprising:

4. The battery (50A, 50B) further includes a fuse (70A, 70B) disposed below the battery (50A, 50B), One of the first bus bar (72A) and the second bus bar (72B) is A wiring connection surface (72Ae) facing in the vehicle width direction and connected to one of the first terminal (82) and the second terminal (85); A fuse connection surface (72Ad) facing in the vertical direction and connected to the fuse (70A, 70B); having The electric vehicle according to claim 1 .

5. The fuse (70A, 70B) is formed in a cylindrical shape extending in the vehicle width direction. The electric vehicle according to claim 4.

6. The fuses (70A, 70B) are provided in a plurality of directions perpendicular to the vehicle width direction. The electric vehicle according to claim 5.

7. The fuse connection surface (72Ad) extends along the front-rear direction of the vehicle and is connected to the plurality of fuses (70A, 70B). The electric vehicle according to claim 6.

8. a support (61) supporting the fuses (70A, 70B) and the one bus bar (72A); fastening members (B1, B2) for fastening the fuse (70A, 70B) and the one bus bar (72A) together to the support body (61); The electric vehicle according to claim 4 , further comprising:

9. The drive shaft 70 further includes a nut (74A, 74B) screwed onto one of the first shaft portion (76a) and the second shaft portion (77a), The support (61) has nut insertion portions (68A, 68B) into which the nuts (74A, 74B) are inserted, one of the first bus bar (72A) and the second bus bar (72B) prevents the nut (74A, 74B) from falling off from the nut insertion portion (68A, 68B); The electric vehicle according to claim 8.

10. the electric vehicle is a two-wheeled vehicle, The wiring connection surface (72Ae) faces the right side of the vehicle. The electric vehicle according to claim 4.

11. A first wiring (81) and a second wiring (84), A first bus bar (72A) connected to the first wiring (81); A second bus bar (72B) connected to the second wiring (84); a first bolt (76) having a first shaft portion (76a) with a first nominal diameter and a first head portion (76b) adapted to a tool of a predetermined size, and fastening the first wiring (81) to the first bus bar (72A); a second bolt (77) having a second shaft portion (77a) having a second nominal diameter different from the first nominal diameter and a second head portion (77b) adapted to a tool of the specified size, and fastening the second wiring (84) to the second bus bar (72B); Equipped with The first wiring (81) includes a first terminal (82) having a first insertion hole (82a) through which the first shaft portion (76a) is inserted, The second wiring (84) includes a second terminal (85) having a second insertion hole (85a) through which the second shaft portion (77a) is inserted and through which the first shaft portion (76a) cannot be inserted. Power supply structure.

Images