CN101847737B - Accumulator device for motorcycle - Google Patents

Abstract

The present invention provides a battery device for an electric motorcycle capable of lowering the center of gravity while maintaining waterproofness. The storage battery device of the electric two-wheeled vehicle is constituted by disposing the storage battery box (36) under the pedal part (F), installing an electric motor (50) for running and driving, and having a control system for controlling the driving of the electric motor (50). The device (34) is provided with a suction pipe (51) for introducing air into the battery box (36), and is provided with a discharge pipe (52) for discharging internal gas, wherein the suction pipe (51) and the discharge pipe (52) ) each opening (51k, 52k) is set above the foot rest (F).

Description

Battery device for electric two-wheeled vehicle

technical field

The invention relates to a storage battery device of an electric two-wheel vehicle.

Background technique

Conventionally, as a storage battery used for driving an electric vehicle, a structure for easily discharging gas generated from the storage battery to the outside has been proposed.

For example, there is known a configuration in which the storage battery is housed in a storage box, and a discharge path is provided in the upper part of the storage box for discharging gas leaked from the storage battery to the outside of the device.

Therefore, even if gas is generated due to overcharging or the like, an increase in the internal pressure of the storage battery can be prevented (see Patent Document 1).

Patent Document 1: (Japanese) Unexamined Patent Publication No. 2008-251308

However, although it is conceivable to use the storage battery of the above-mentioned structure for driving an electric two-wheeled vehicle, in the case of a two-wheeled vehicle, compared with a four-wheeled vehicle, there are more exposed parts, so it is necessary to take measures to improve waterproofness.

On the other hand, in order to lower the center of gravity of the battery, which is a heavy object, it is required to arrange it at a lower part of the vehicle.

Contents of the invention

Therefore, an object of the present invention is to provide a battery device for an electric motorcycle capable of lowering the center of gravity while maintaining waterproofness.

In order to achieve the above object, in the battery device of the electric two-wheeled vehicle of the first invention, the footrest (for example, the footrest F in the embodiment) supported by the frame (for example, the side frame 5 in the embodiment) A battery box (for example, the battery box 36 in the embodiment) is arranged below, and a battery (for example, the battery unit 37 in the embodiment) is accommodated inside the battery box, and a vehicle for driving by using electric power from the battery is installed. motor (for example, the electric motor 50 in the embodiment), and has a control section (for example, the control device 34 in the embodiment) that controls the driving of the motor, and is provided with a suction passage ( For example, the suction pipe 51 in the embodiment), and a discharge passage (for example, the discharge pipe 52 in the embodiment) is provided to discharge the internal air. The battery device is characterized in that the suction passage and the discharge passage The openings (for example, the openings 51k and 52k in the embodiment) are set higher than the footrest.

The battery device of the electric motorcycle according to the second aspect of the invention is characterized in that a suction fan (for example, sirocco fan 49 in the embodiment) is provided in the discharge passage.

The battery device for an electric motorcycle according to the third aspect of the invention is characterized in that a plurality of the suction passages are provided.

According to a fourth aspect of the invention, the battery device for an electric motorcycle is characterized in that the intake passage is connected to a lower portion of the battery case, and the discharge passage is connected to an upper portion of the battery case.

According to a fifth aspect of the invention, the battery device of an electric motorcycle is characterized in that the front ends of the suction passage and the discharge passage are curved, and the openings are directed downward.

According to a sixth aspect of the invention, the storage battery device for an electric motorcycle is characterized in that the suction passages are arranged on the left and right via a main frame of the vehicle (for example, the main frame 2 in the embodiment).

The storage battery device for an electric motorcycle according to claim 7 is characterized in that the suction passage and the discharge passage are located along the vehicle frame (for example, the side frame 5 in the embodiment) in the front and rear of the pedal portion. The shape extends upwards.

According to the invention described in claim 1, the center of gravity can be lowered by arranging the battery below the footrest, and the opening of the suction passage and the opening of the discharge passage are located above the footrest to prevent the battery case from being flooded.

According to the invention described in claim 2, air can be forcibly introduced from the suction passage to actively cool it, and even if gas is generated in the battery case, it can be forcibly discharged to the outside.

According to the invention described in claim 3, by increasing the actual cross-sectional area of the suction passage, it is possible to reduce the suction resistance and effectively cool the battery.

According to the invention described in claim 4, the air sucked in from the lower part of the storage battery is directed to the upper part, so that the wind can easily flow through the entire storage battery, so that the storage battery can be effectively cooled. In addition, when gas is generated from the storage battery Next, the generated gas can be effectively discharged from the upper part.

According to the invention described in claim 5, it is possible to make it more difficult for water to enter by forming the openings that open downward.

According to the invention described in claim 6, compared with the case where a single suction passage is formed, the space required for arranging each suction passage can be reduced, and it is difficult to be restricted by arrangement and easy to arrange.

According to the invention described in claim 7, it is possible to reduce the occupied space compared to the case of not following the vehicle frame.

Description of drawings

Fig. 1 is a side view of an electric motorcycle according to an embodiment of the present invention;

Fig. 2 is a perspective view of an electric motorcycle according to an embodiment of the present invention in a state where exterior parts are removed;

Figure 3 is a side view of the frame around the high voltage battery;

Fig. 4 is a perspective view of Fig. 3;

Fig. 5 is the top view of Fig. 3;

Fig. 6 is a sectional view along the A-A line of Fig. 8;

Fig. 7 is a sectional view along the B-B line of Fig. 8;

Fig. 8 is a perspective view schematically showing the inside of the battery case.

Explanation of reference signs

2 main frame 5 side frame (frame) 34 control device (control part)

36 battery box 37 battery assembly (battery)

49 sirocco fan (suction fan) 50 electric motor (electric motor)

51 Suction pipe (suction passage) 52 Discharge pipe (discharge passage)

51k, 52k Opening part F Pedal part

Detailed ways

Embodiments of the present invention will be described below based on the drawings.

Fig. 1 is a side view of an electric motorcycle according to an embodiment of the present invention. In addition, FIG. 2 is a perspective view showing a state of the electric motorcycle 1 with exterior components removed.

As shown in FIGS. 1 and 2 , the electric motorcycle 1 is a small motorized motorcycle having a pedal portion F, and the rear wheel WR is driven by the rotational driving force of the electric motor 50 for running driving built in the swing arm 12. . In addition, the high-voltage battery 31 that supplies electric power to the electric motor 50 is charged by connecting an external power supply to a charging port (not shown) provided in the vehicle body.

A head pipe 3 pivotally supporting a steering column 7 a is joined to a front end portion of the main frame 2 . A steering handle 7 is attached to the upper portion of the steering column 7a, and a pair of left and right front forks 4 are attached to the lower portion. A front wheel WF is rotatably supported on a lower end portion of the front fork 4 .

The upper ends of a pair of left and right side frames 5, 5 are connected to the approximately central portion of the main frame 2 in the vertical direction. Extending in the horizontal direction, a 72V high-voltage battery 31 that supplies electric power to the electric motor 50 is disposed so as to be sandwiched between the horizontal portions of the left and right side frames 5 , 5 . The horizontal parts of the side frames 5 and 5 stand obliquely rearward and bend upward of the vehicle body, and are connected to the rear frame 6 that supports the article storage room 17 and the like.

Between the side frames 5 , 5 , a low cross frame 24 is attached to the front side, and the lower end portion of the main frame 2 is connected to the center portion of the low cross frame 24 . At the rear of the low cross brace 24, a low cross brace rear frame 25 is installed between the side frames 5,5. Utilize the low cross brace 24 and the low cross brace rear frame 25 to clamp the high voltage battery 31 front and back. That is, the left and right side frames 5, 5, the low cross frame 24, and the low cross frame rear frame 25 surround the high voltage battery 31 and protect the high voltage battery 31 from external impact loads.

Here, on each side frame 5 , a side bracket 23 with a U-shaped cross section is attached to the side of the high-voltage battery 31 , and a side bracket 23 with a height extending from the vehicle width direction is installed across each side bracket 23 . The voltage battery 31 is fixed to the fixing plate 22 of the side frame 5 .

At the rear of the side frame 5 is mounted a pivot plate 20 on which the rocker pivot 11 is formed. The front end portion of the cantilevered swing arm 12 is rotatably supported on the swing arm pivot 11 , and the cantilevered swing arm 12 supports the rear wheel WR only by the left arm in the vehicle width direction. The rear wheel WR is rotatably supported on the rear portion of the swing arm 12 by the axle 19 , and the rear end portion of the swing arm 12 is suspended from the rear frame 6 by the rear buffer unit 13 .

Under the swing arm 12 , a power drive unit 35 that converts DC current supplied from the high-voltage battery 31 into AC current and supplies it to the electric motor 50 is housed in the cover member 21 . Electric power is supplied from the power drive unit 35 to the motor 50 via the wiring L, whereby the power is transmitted from the motor 50 to the axle 19 and the rear wheel WR via the first reduction gear G1 and the second reduction gear G2 sequentially. In addition, reference sign H denotes a smoothing capacitor.

On the front side of the vehicle body of the steering handle 7, a front cover 9 is provided as an exterior member, and an instrument unit 8 including a speedometer and the like is attached to an upper portion of the front cover 9. As shown in FIG.

A headlight 10 is provided on the vehicle body front side of the front cover 9 . In addition, a foot rest F on which the occupant puts his or her feet is formed on the upper portion of the high-voltage battery 31 , and a seat cover 15 is provided on the outer side of the rear frame 6 . A seat 14 that is opened and closed by a hinge on the front side of the vehicle body is attached to an upper portion of the seat cover 15 . In addition, a tail light device 16 is attached to a rear end portion of the seat cover 15 . A center bracket 18 having two leg portions divided in the vehicle width direction is attached to the pivot plate 20 .

On the right side of the head pipe 3 in the vehicle width direction, a 12V low-voltage battery 30 that supplies power to auxiliary mechanisms such as the headlight 10 and a control device 34 is placed in the battery box 30a and fixed to the battery box with a pressing plate 30b 30a. The low-voltage storage battery 30 is charged with the electric power of the high-voltage storage battery 31 . Inside the seat cover 15 , in front of the article storage room 17 , are disposed a DC-DC converter 32 for converting 72V of a high-voltage battery 31 to 12V, and a contactor box 33 for accommodating fuses, relays, and the like. Further, on the outer side of the rear frame 6 on the right side in the vehicle width direction, a control unit (ECU) 34 that controls the electric motor 50 via a power drive unit 35 and the like is disposed.

Fig. 3 is a side view of the framework around the high-voltage battery, Fig. 4 is a perspective view of Fig. 3, Fig. 5 is a top view of Fig. 3, Fig. 6 is a sectional view along line A-A of Fig. 8, Fig. 7 is a sectional view along line B-B of Fig. 8 Sectional view of the line.

As shown in FIGS. 3 to 5 , the high-voltage battery 31 includes a battery case 36 provided below the footrest F, and a battery unit 37 arranged inside the battery case 36 . On the upper part behind the low cross brace rear frame 25, a middle cross brace frame 26 is installed in a manner straddling between the side frames 5,5.

Here, on the low cross frame 24 and the low cross frame rear frame 25, a protective plate for protecting the high-voltage battery 31 when falling over or crossing an uneven road surface is provided to connect the two ends of each cross frame. 27. A pair of lower guards 28 (refer to FIG. 6 ) are attached in the front-rear direction across the low-bracket frame 24 and the low-bracket rear frame 25 and protect the bottom wall 36t of the battery case 36 .

A flange portion 36 f provided on the side of the battery case 36 is formed on the side bracket 23 so as to avoid the fixing plate 22 . The flange portion 36f is fixed to the top surface of the side bracket 23 welded to the side frame 5 with bolts 29 . Here, as shown in FIG. 6 , a buffer member 38 made of rubber is attached to a portion where the bolt 29 is fastened to the flange portion 36 f.

As shown in FIGS. 6 and 7 , the battery case 36 is composed of a bottomed box-shaped case body 39 and a cover 41 covering the upper opening 40 of the case body 39 . The box body 39 has ribs 36l for increasing rigidity on the bottom surface of the bottom wall 36t, and grooves 42 are formed on both side edges of the top surface of the bottom wall 36t. The aforementioned flange portions 36 f are formed on both side edges of the upper opening portion 40 of the case body 39 . A fitting groove 43 is formed on the periphery of the upper opening 40 of the box body 39, and a fitting portion 44 fitted to the fitting groove 43 is formed on the opening periphery of the cover 41, so that the fitting groove 43 of the box body 39 and the The fitting part 44 of the cover 41 is fitted to prevent water ingress from the connection part of the case body 39 and the cover 41, thereby ensuring watertightness.

A recess 45 is provided on the upper wall 41z of the cover 41 , and the battery pack 37 of the high-voltage battery 31 is press-fixed via the plate member P by the buffer rubber 46 provided on the back of the recess 45 .

In addition, as shown in FIG. 7 , a pair of left and right suction ports 47 are formed on the front of the case body 39 of the battery case 36 , specifically, on the lower portion of the front vertical wall 36 k. On the rear top surface of the cover 41 constituting the upper part of the battery box 36, that is, at the rear of the upper wall 41z, an opening 41h is provided, and a sirocco fan 49 as a suction fan having a discharge port 48 is attached to the opening 41h. .

As shown in FIGS. 3 to 5 , each suction port 47 of the battery box 36 is connected with a curved suction pipe 51 extending upward, and the upper end opening 51 k of the suction pipe 51 is located above the footrest F The connecting portion where the side frame 5 is connected to the main frame 2 is opened below.

In addition, a curved discharge pipe 52 extending upward is connected to the discharge port 48 of the sirocco fan 49 . The discharge pipe 52 also has an upper end opening 52 k above the footrest F and at the same height as the suction pipe 51 . Open your mouth. Here, the opening 51 k of the suction pipe 51 opens in the front cover 9 , and the opening 52 k of the discharge pipe 52 opens in the side cover 15 . In addition, the opening 51k of the suction pipe 51 is formed to have a circular cross section, and the opening 52k of the discharge pipe 52 is formed to have a quadrangular cross section. Here, the suction pipes 51 , 51 and the discharge pipe 52 are collectively arranged between the side frames 5 , 5 and extend upward in a shape substantially along the side frame 5 . In addition, the suction pipe 51 extends along the main frame 2 . Thereby, it may be arranged further inside the side frame 5, 5, and the occupied space can be saved compared to the case of not being along the side frame 5.

FIG. 8 schematically shows a state where the battery cells 54 , the battery cells 54 u , and the battery pack 37T are arranged inside the battery case 36 . In addition, in FIG. 7, FIG. 8, description of the plate member P, the recessed part 45, and the buffer rubber 46 in FIG. 6 is abbreviate|omitted.

As shown in FIGS. 6 to 8 , the battery unit 37 is configured by arranging three sets of single units 37T in the vehicle front-rear direction. The unit cell 54u is formed by sandwiching and supporting the cell 54 in two layers up and down by the battery holder 55 front and rear. Ten sets are arranged in the width direction to constitute the single unit 37T.

Here, the unit unit 37T has front and rear walls 37f and 37r, upper and lower walls 37u and 37l, and side walls 37s, and slits S are formed in the upper and lower walls 37u and 37l along the vehicle front and rear direction. Protrusions 53 that come into contact with the bottom wall 36t of the battery case 36 are provided at corners of the lower wall 37l. The protrusions 53 are formed at positions in contact with the corners 36d, specifically the four corners of the bottom wall 36t, where the corners 36d are the bottom wall 36t, front and rear walls 37f, 37r, and side walls 36s of the battery box 36. corners between. A gap 60 is formed between the bottom wall 36 t of the case body 39 and the lower wall 37 l of the battery pack 37 by the protrusion 53 .

The unit 37T secures a gap 58 between the vertical wall 36k of the battery case 36 and the adjacent unit 37T, and the rib 57 is provided in the gap 58 . Due to the ribs 57, the air does not escape upward from the gap 58, but is evenly distributed from the gap 60 in the lower part of the case body 39 of the battery case 36 toward the lower side of the lower wall 371 of each unit unit 37T. Next, the air flows uniformly upward from the slit S of the lower wall 37l of the cell unit 37T along the cell unit 54u. Here, the rib 57 is provided on the upper side of the suction port 47 , and the sucked air first flows toward the lower part of the battery case 36 .

According to the present embodiment, when the sirocco fan 49 is driven while the electric motorcycle 1 is running, air is forcibly sucked in from the opening 51k of the suction pipe 51 of the battery case 36 as indicated by the arrows in FIG. 7 . The sucked air is guided by the gap 60 between the bottom wall 36t of the battery case 36 and the battery module 37, more precisely, the gap 60 between the bottom wall 36t of the battery case 36 and the lower wall 37l of the unit 37T.

Here, since the rib 57 is provided at the gap 58 between the three unit units 37T disposed in the front-rear direction and the longitudinal wall 36k of the battery case 36, air does not flow upward from the gap 58, The introduced air spreads uniformly from the slit S of the lower wall 371 of the unit unit 37T to the lower part of each battery cell 54u, and goes upward from the lower part of each battery cell 54u around each battery cell 54 supported by the holding part 55. The battery cells 54 are cooled and flow upward from the slit S of the upper wall 37u. After that, it is discharged from the opening 41h of the upper wall 41z of the lid 41 of the battery case 36 through the discharge pipe 52 by the sirocco fan 49 from the opening 52k.

In particular, since the suction pipe 51 is connected to the lower portion of the longitudinal wall 36k on the front side of the battery box 36, and the discharge pipe 52 is connected to the sirocco fan 49 on the upper wall 41z of the cover 41 at the top of the battery box 36, the air flow from the battery box The air sucked in from the lower part of 36 is toward the upper part, thereby, relative to the whole interior of battery case 36, wind can be easily circulated, so that the battery pack 37 composed of each single pack 37T can be effectively cooled, and the self-battery pack 37 When gas is generated, the generated gas can be efficiently discharged from the upper part.

Here, since the high-voltage battery 31 is disposed below the footrest F, the center of gravity of the electric motorcycle 1 can be lowered. Moreover, since the openings 51k, 52k of the suction pipe 51 and the discharge pipe 52 are opened inside the front cover 9 and the inside of the seat cover 15, rainwater or the like does not enter these openings 51k, 52k from the outside. In addition, even if the electric motorcycle 1 is immersed in water to the vicinity of the footrest F, since the opening 51k of the suction pipe 51 and the opening 52k of the discharge pipe 52 are located above the footrest F, it is also possible to prevent water from entering the battery case. 36 immersion in water.

Furthermore, since the pair of suction pipes 51 for introducing air are provided, the cross-sectional area of the actual passage is increased and the suction resistance is reduced, so that the battery pack 37 can be effectively cooled. In addition, by dividing the suction pipe 51 into two, compared with the case of constituting one suction pipe, there is an advantage that the space required for the arrangement of each suction pipe can be reduced, and it is difficult to be restricted by the arrangement and easy. layout.

In addition, the present invention is not limited to the above-mentioned embodiment. For example, as shown by the dotted line in FIG. The openings 51k, 52k are directed downward, making it more difficult for water to enter. In addition, although the case where a pair (two) suction pipes 51 were provided was demonstrated, as long as there are several pipes, there may be two or more.

Claims (5)

1. the accumulator plant of an electric bicycle, in the below of the pedal position (F) supported by framework (5) configuration accumulator box (36), in the inside of this accumulator box storage storage battery (37), arrange and utilize the electric power from described storage battery to carry out the traveling drive motor (50) driven, and there is the control part (34) of the driving controlling described motor, be provided with the suction passage (51) air being introduced into described accumulator box, and be provided with the drain passageway (52) of being discharged by internal gas, the feature of this accumulator plant is,

By each peristome (51k, 52k) of described suction passage and described drain passageway, compare described pedal position and be more set in top,

Described suction passage is provided with multiple, and multiple described suction passage is arranged along body frame,

Further, the front end of described suction passage and described drain passageway bends, and this bending part is in identical height, and described each peristome points to below,

When electric bicycle (1) travels, when driving attraction fan (49), air sucks by force from the peristome (51k) of the suction passage (51) of accumulator box (36), the air be inhaled into, guided by the gap (60) between the diapire (36t) in the gap (60) between the diapire of accumulator box (36) (36t) and storage battery (37), i.e. accumulator box (36) and the lower wall (371) of unimodule (37T)

Between three each unimodules (37T) being arranged at fore-and-aft direction and and longitudinal wall (36k) of accumulator box (36) between gap (58) place be provided with rib (57), air can not flow upward from gap (58), the air be imported into from the slit (S) of the lower wall (371) of unimodule (37T) equably throughout the bottom of each single cell units (54u), and around each monocell (54) supported in maintained portion (55) from the bottom of each single cell units (54u) upwards effluent move, thus cool monocell (54) and upwards flow out side from the slit (S) of upper wall (37u), afterwards, utilize and attract fan (49), the peristome (41h) of lid (41) upper wall (41z) from accumulator box (36) is discharged from peristome (52k) by drain passageway (52).

2. the accumulator plant of electric bicycle as claimed in claim 1, is characterized in that, is provided with attracts fan (49) at described drain passageway.

3. the accumulator plant of electric bicycle as claimed in claim 1 or 2, it is characterized in that, the bottom of described suction passage and described accumulator box links, and the top of described drain passageway and described accumulator box links.

4. the accumulator plant of electric bicycle as claimed in claim 1, is characterized in that, described suction passage across vehicle body frame (2) and be configured at left and right.

5. the accumulator plant of electric bicycle as claimed in claim 1 or 2, is characterized in that, described suction passage and described drain passageway in the front and back of described pedal position to extend upward along the shape of car structure (5).