JP2020116973A - Power assisted bicycle - Google Patents

Abstract

To provide a power assisted bicycle which has a battery unit invisible from the exterior, and which facilitates taking the battery unit in and out relative to the storage portion of the battery unit.SOLUTION: A battery device 5 loaded on a power assisted bicycle includes: a storage portion which is provided in a top tube 11, and which includes a connection terminal electrically connected to an auxiliary drive device; a lid plate 7 that can be opened and closed to block off an opening 60 opened in the outer circumference surface of the top tube 11; and a battery unit 50 that is taken in and out relative to the storage portion through the opening 60. The battery unit 50 includes: batteries that are the power source of the auxiliary drive device; a battery storage case that stores therein the batteries; a charging terminal for charging the batteries; and a drive terminal which is in contact with the connection terminal when the battery unit 50 is stored in the storage portion, and which electrically connects the auxiliary drive device to the batteries.SELECTED DRAWING: Figure 3

Description

The present invention relates to an electrically assisted bicycle equipped with an auxiliary drive device, and more particularly to an electrically assisted bicycle capable of traveling by adding the auxiliary drive force generated by the auxiliary drive device to the drive force by the pedaling force of a petal. The invention particularly relates to a structure for assembling a battery unit for supplying power to an auxiliary drive device to a vehicle body.

In the electrically assisted bicycle, a rechargeable battery such as a lithium ion battery is used as a battery unit. A large-capacity battery is used for this type of battery unit, which is heavy, and the battery unit is installed in the vicinity of the center of gravity of the electrically assisted bicycle in consideration of the balance of the vehicle body (for example, Patent Document 1). Reference 1).

In recent years, a foldable foldable bicycle equipped with an auxiliary drive device has been proposed. Since this type of power-assisted bicycle has a foldable structure, the mounting position of the battery unit is further restricted.For example, the battery unit is mounted on the rear surface of the seat tube near the center of gravity of the vehicle body or the upper surface of the back fork. Has been.

JP, 9-58563, A

A foldable electrically assisted bicycle is required to be simple and convenient to carry. Therefore, weight reduction of the vehicle body is the most important. In order to extend the travelable distance, it is necessary to increase the battery capacity, resulting in an increase in weight and size of the battery unit. However, considering the convenience of a foldable bicycle, if the minimum necessary travel distance (for example, about 10 km) can be secured, the user's request is generally satisfied, and thus the foldable electric drive is possible. In the assisted bicycle, the battery unit can be downsized.

Due to the miniaturization of the battery unit, an electric assist bicycle having a structure in which the battery unit is incorporated inside the top tube and the battery unit is taken in and out from the two-folded portion of the top tube forming the folding structure has been proposed. In this electrically-assisted bicycle, the battery unit is stored in the vehicle body and cannot be seen from the outside, so that it has the advantages that it looks good and the battery unit is hard to be stolen.

Since the battery unit is taken out of the vehicle body and carried when the vehicle is stopped, it is necessary that the battery unit can be easily taken in and out of the vehicle body. However, in the structure in which the battery unit is put in and taken out from the two-folded portion of the top tube, it is difficult to put in and take out the battery unit, and in order to take out the battery unit, it is necessary to fold the vehicle body, which is troublesome.

The present invention has been made in view of the above problems. In addition to the battery unit being housed in the vehicle body and invisible from the outside and having a good appearance, the battery unit can be easily put in and taken out from the battery unit storage section. The purpose of the present invention is to provide a simple electric assist bicycle.

An electrically assisted bicycle according to the present invention is equipped with an auxiliary drive device and a battery device, and the battery device has a connection terminal provided inside a frame member forming a vehicle body and electrically connected to the auxiliary drive device. The battery unit storage unit includes a battery unit storage unit, an openable/closable lid plate unit for closing an opening formed on the outer peripheral surface of the frame member, and a battery unit that is inserted into and removed from the battery unit storage unit. The battery unit includes a battery, a charging terminal for charging the battery, and a driving terminal that contacts the connecting terminal when stored in the battery unit storage section to electrically connect the auxiliary driving device and the battery. ..

In the power-assisted bicycle having the above-described configuration, the battery unit is inserted into the battery unit storage section through the opening of the frame member, and the opening is closed by the cover plate section. Since the opening is formed on the outer peripheral surface of the frame member, the work of inserting the battery unit into the battery unit storage portion is easy. In the state where the battery unit is stored, the drive terminal of the battery unit comes into contact with the connection terminal of the battery unit storage section to conduct electricity, and power is supplied from the battery to the auxiliary drive device. Further, in the battery storage state, the battery unit is invisible from the outside and has a good appearance.
When the vehicle is stopped, the cover plate is removed from the opening of the frame member and the battery unit is taken out from the battery unit storage. Since the opening is formed on the outer peripheral surface of the frame member, it is easy to take out the battery unit from the battery unit housing. In a foldable electric assist bicycle, it is not necessary to fold the vehicle body to take out the battery unit. The battery unit taken out can be carried, and the battery unit can be charged by connecting an external power supply to the charging terminal.

In a preferred embodiment, the lid plate portion is supported on the peripheral edge of the opening and constitutes the outer peripheral surface of the frame member in the lid-covered state.

It is preferable that the frame member has an opening formed on either the upward facing surface or the laterally facing surface of the outer peripheral surface. When the opening is provided on the surface of the outer peripheral surface facing upward, the battery unit is taken in and out from above. When the opening is provided on the side surface of the outer peripheral surface, the battery unit is taken in and out from the side.

In a foldable power-assisted bicycle, the frame member is preferably a top tube, and has a two-fold portion and a joint portion connecting the two-fold portions at an intermediate position in the longitudinal direction, and the frame member is The battery unit storage and the opening are provided at the front position.

In a power-assisted bicycle that does not fold, the frame member is preferably a down tube, and the battery unit storage portion and the opening portion are provided at an intermediate position in the length direction.

A battery unit according to a preferred embodiment has a battery storage case that stores a battery, and the lid plate portion constitutes a part of a wall of the battery storage case. According to this embodiment, the lid plate portion is integrated with the battery storage case, but the present invention is not limited to such an integrated structure, and the lid plate portion and the battery storage case may be separate and independent. Good.

The power-assisted bicycle according to the present invention further includes a holding mechanism portion that holds the lid plate portion in the covered state.

In a preferred embodiment, the holding mechanism portion is provided with a latch bolt that is provided at one end of the battery unit storage portion and is biased to project into the battery unit storage portion, and a member that engages with the latch bolt provided in the battery unit. It includes a dowel hole and a release operation mechanism that retracts the latch bolt to release the engagement with the engagement hole.

According to this embodiment, the latch bolt and the engagement hole are engaged by accommodating the battery unit in the battery unit storage portion, and the battery unit is held in the battery unit storage portion. By operating the release operation mechanism, the latch bolt retracts and the engagement with the engagement hole is released, so that the battery unit can be taken out from the battery unit storage portion. The holding mechanism is not limited to the mechanism in which the latch bolt engages with the engagement hole as long as the holding mechanism can prevent the battery unit from coming out of the battery unit storage.

The release operation mechanism includes, for example, a cylinder lock, and the cylinder lock includes a key hole that opens on the outer peripheral surface of the frame member, and a cylinder that rotates by operating a key inserted into the key hole to retract the latch bolt. Equipped with.

According to this embodiment, the engagement between the latch bolt and the engagement hole cannot be released unless the proper key is inserted and operated in the key hole, so there is no risk of a battery unit being pulled out by a third party. It should be noted that it is not always necessary to use a lock mechanism as the release operation mechanism, and a mechanism that can retract the latch bolt by manual operation, such as a knob or a lever, may be used. The lock mechanism is not limited to the cylinder lock, but a dial lock or the like can be used.

The power-assisted bicycle according to the present invention further includes a push-out mechanism that is provided at one end of the battery unit storage portion and urges one end of the battery unit toward the opening.

If the pushing mechanism is provided, when the holding mechanism section releases the holding of the lid plate section, the battery unit is pushed by the pushing mechanism and pushed out from the battery unit storing section, so that the battery unit can be easily taken out. it can.

According to the present invention, the battery unit is housed in the vehicle body and cannot be seen from the outside, and the appearance is good, and the battery unit can be easily put in and taken out of the battery unit housing portion. With a foldable electric assist bicycle, it is not necessary to fold the vehicle body to take out the battery unit.

It is a front view showing the appearance of one embodiment of an electrically-assisted bicycle. It is a front view which shows the external appearance of other embodiment of an electrically assisted bicycle. It is a perspective view which expands and shows a part of top tube with which the battery device was incorporated. It is sectional drawing which follows the AA line of FIG. It is a front view of a battery unit. It is a side view which shows the one end part of a battery unit. It is a side view which shows the other end part of a battery unit. It is an exploded perspective view showing composition of a battery unit. It is a top view which shows a battery unit storage part. It is a perspective view which shows one end part of a battery unit storage part. It is a perspective view which shows the other end part of a battery unit storage part.

1 to 11 show an embodiment of an electrically assisted bicycle of the present invention. The electrically assisted bicycle 1 is capable of traveling by adding the auxiliary driving force generated by the auxiliary driving device 4 to the driving force generated by the pedaling force of the petal 33a. 1 and 2 show two embodiments of the power-assisted bicycle 1, both of which are equipped with an auxiliary drive device 4 and a battery device 5 for supplying power to the auxiliary drive device 4. ing.

The embodiment shown in FIG. 1 is an electrically assisted bicycle 1 having a folding structure, and a battery device 5 is incorporated inside a top tube 11. The embodiment shown in FIG. 2 is an electrically assisted bicycle 1 that does not have a folding structure, and the battery device 5 is incorporated inside the down tube 18. The location where the battery device 5 is incorporated is not necessarily limited to the top tube 11 and the down tube 18 as long as it is inside the hollow frame member that constitutes the vehicle body frame 10.

In the foldable electric assist bicycle 1 of FIG. 1, the top tube 11 forming the center of the vehicle body frame 10 has a structure capable of being folded in two at a position closer to the rear part from the central part of the length. A joint portion 2 is provided in the two-folded portion, and the top tube 11 divided into front and rear is joined by the joint portion 2. The joint portion 2 has a lever 20, and the joint portion 2 is coupled or disengaged by operating the lever.

At the rear end of the top tube 11, there are provided a seat tube 12 that faces the up and down direction and back forks 13 and 13 that form a pair of left and right. Front forks 15, 15 forming a left-right pair are provided at the front end portion of the top tube 11 via a head tube 14 that faces in the vertical direction. The head tube 14 has a structure capable of being folded in two for folding. The two folded parts are joined by a joint part 21 having a lever 22.

A seat post 16 is supported on the seat tube 12 so that its height can be adjusted. A saddle 16a is attached to the upper end of the seat post 16. A stem 17 is supported on the head tube 14 so that its height can be adjusted. A handle 17a is provided at the upper end of the stem 17. The left and right back forks 13 extend obliquely rearward. The rear wheel 3 is rotatably supported between the rear ends of the back forks 13. The left and right front forks 15 are directed obliquely downward, and the front wheels 30 are rotatably supported between the lower ends.

Below the rear part of the top tube 11, a bearing tube 31 attached to the back forks 13L and 13R is located. The bearing cylinder 31 rotatably supports the drive shaft 32. Crank arms 33 are attached to both ends of the drive shaft 32, respectively. A pedal 33a is attached to the tip of each crank arm 33. The rotation of the drive shaft 32 and the crank arm 33 is transmitted to the rear wheel 3 via the sprocket 34 and the chain 35.

Hollow frame members such as the top tube 11, the seat tube 12, the back fork 13, the head tube 14, and the front fork 15 constitute the vehicle body frame 10 that forms the skeleton of the electrically assisted bicycle 1. Each frame member is made of an expanded material of aluminum alloy.

The auxiliary drive device 4 includes a motor drive unit 40, a controller 41, a torque detector (not shown), and the like. The motor drive unit 40 is incorporated in the hub 36 of the front wheel 30. The controller 41 is incorporated in a position on the rear side of the joint portion 2 of the top tube 11. The torque detector is provided at the position of the crank arm 33. The controller 41 takes in the torque detected by the torque detector and causes the motor drive unit 40 to generate an auxiliary driving force according to the magnitude of the detected torque. A battery device 5 for supplying electric power to the auxiliary drive device 4 is incorporated in a position on the front side of the joint portion 2 of the top tube 11.

The power-assisted bicycle 1 shown in FIG. 2 includes a top tube 11 and a down tube 18 that form the center of a body frame 10. A seat tube 12 oriented vertically is provided between the rear ends of the top tube 11 and the down tube 18, and a head tube 14 oriented vertically is provided between the front ends.
A seat post 16 is supported on the upper end of the seat tube 12 so that the height thereof can be adjusted. A saddle 16a is attached to the upper end of the seat post 16. A stem 17 is connected to the upper end of the head tube 14. A handle 17a is provided at the upper end of the stem 17.

The upper end of the seat tube 12 is connected to the front ends of the pair of left and right seat stays 19a and 19a, and the lower end thereof is connected to the front ends of the left and right pair of chain stays 19b and 19b. The seat stay 19a and the chain stay 19b extend backward and are connected to each other, and the rear wheel 3 is rotatably supported between the connecting portions.
Left and right front forks 15 are connected to the lower end of the head tube 14. The front fork 15 is directed obliquely downward, and the front wheel 30 is rotatably supported between the lower ends thereof.

A bearing sleeve 31 is located at the lower end of the seat tube 12, and a drive shaft 32 is rotatably supported by the bearing sleeve 31. Crank arms 33 are attached to both ends of the drive shaft 32, respectively. A pedal 33a is attached to the tip of each crank arm 33. The rotation of the drive shaft 32 and the crank arm 33 is transmitted to the rear wheel 3 via the sprocket 34 and the chain 35.

Hollow frame members such as the top tube 11, the down tube 18, the seat tube 12, the head tube 14, the front fork 15, the seat stay 19a, and the chain stay 19b configure the vehicle body frame 10 that forms the skeleton of the power-assisted bicycle 1. Each frame member is made of an expanded material of aluminum alloy.

The auxiliary drive device 4 includes a motor drive unit 40, a controller 41, a torque detector (not shown), and the like. The motor drive unit 40 is incorporated in the hub 37 of the rear wheel 3. The controller 41 is incorporated in an intermediate position of the down tube 18. The torque detector is provided at the position of the crank arm 33. The controller 41 takes in the torque detected by the torque detector and causes the motor drive unit 40 to generate an auxiliary driving force according to the magnitude of the detected torque. A battery device 5 for supplying electric power to the auxiliary drive device 4 is incorporated in an intermediate position of the down tube 18.

In each of the electrically assisted bicycles 1 shown in FIGS. 1 and 3, the battery device 5 is electrically connected to the motor drive unit 40, the controller 41, and the torque detector that form the auxiliary drive device 4 by a cord wire (not shown). Further, the controller 41 is electrically connected to the motor drive unit 40 and the torque detector by a cord wire (not shown).

FIG. 3 shows the external appearance of the battery device 5 assembled to the top tube 11 of the electrically assisted bicycle 1 of FIG.
As shown in FIG. 4, the battery device 5 faces a battery unit storage section (hereinafter, simply referred to as “storage section”) 6 formed inside the hollow of the top tube 11 and an outer peripheral surface of the top tube 11 upward. A lid plate portion 7 that can be opened and closed to close the opening 60 formed in the surface 11a is provided. The outer peripheral surface of the top tube 11 is rounded, and the cross-sectional shape in the direction orthogonal to the length direction is substantially rectangular. The storage portion 6 is surrounded by the side wall surface and the bottom surface that face each other, and has a substantially rectangular cross-sectional shape in the direction orthogonal to the length direction.

The opening 60 has an opening width smaller than the width of the top tube 11, and is formed in a long rectangular shape along the length direction of the top tube 11. The top surface of the lid plate portion 7 has the same roundness as the outer peripheral surface of the top tube 11, and the planar shape is a rectangular shape slightly larger than the opening portion 60. The lid plate portion 7 and the top tube 11 are made of the same material, and the surface of the lid plate portion 7 is colored with the same color as the top tube 11. In the lid-covered state, the lid plate portion 7 is supported on the peripheral edge of the opening 60 of the top tube 11 and constitutes the outer peripheral surface of the top tube 11. The lid-covered state is held by a holding mechanism section 70 described later. The opening portion 60 communicates with the storage portion 6 and is located directly above the storage portion 6, and the battery unit 50, which will be described later, is taken in and out from above.
The opening 60 may be provided on the surface 11b facing the side of the top tube 11, and in this case, the battery unit 50 described later is taken in and out from the side.

The battery device 5 includes a battery unit 50 that is inserted into and removed from the storage portion 6 through the opening 60. As shown in FIGS. 4 to 8, the battery unit 50 includes a battery 51 that is a power source of the auxiliary drive device 4, and a battery storage case 8 that stores the battery 51 in a sealed state.

The battery storage case 8 has a metal casing 80 whose upper surface and both ends are open, and first and second synthetic resin end plate portions 81 attached to the open portions of both ends of the casing 80. , 82. The lid plate portion 7 is mounted so as to close the open portion of the upper surface of the housing portion 80, and constitutes a part of the outer wall of the battery storage case 8, that is, the upper plate portion. The housing 80 has side plates 80a and 80b and a bottom plate 8c, and the length and width are set smaller than the opening length and opening width of the opening 60, and the height is set smaller than the depth of the storage section 6. Thus, the battery storage case 8 can be inserted into and removed from the storage portion 6 through the opening 60. The housing portion 80 may include an upper plate portion that is continuous with the both side plate portions 80a and 80b. In this case, the lid plate portion 7 also needs to serve as the upper plate portion of the battery storage case 8. There is no.

The battery 51 is composed of a plurality of lithium ion batteries and can be charged, and a charging terminal 83 is provided on one side surface of the second end plate portion 82 as shown in FIGS. 5 and 8. ing. Charging can be performed by connecting the charging terminal 83 to an external power source via a charging device.

As shown in FIG. 8, the battery 51 is housed inside the battery housing case 8 together with the protective plate 52 and the printed circuit board 53. The open portions at both ends of the casing 80 are closed by the first and second end plate portions 81 and 82. Although not shown in FIG. 8, a power switch and a plurality of LEDs for gradually lighting up and displaying the remaining battery level are mounted on the printed circuit board 53. The cover plate portion 7 is provided with one large circular hole 72 and four small circular holes 73. As shown in FIG. 3, the power switch 55 and the LED 54 are located in these holes 72, 73. By doing so, it is possible to operate and view from the outside.

The printed circuit board 53 is further provided with an LED display circuit for controlling the lighting operation of the LED 54, a charging/discharging circuit for controlling charging and discharging of the battery 51, and a USB terminal 84 provided on the outer surface of the first end plate portion 81 (see FIG. 7). A power supply circuit that outputs a power supply voltage from the battery 51 to the reference). The USB terminal 84 is capable of supplying power by connecting an external device such as a smartphone.

As shown in FIG. 6, a trapezoidal convex portion 85 for alignment and a plate-shaped driving terminal 86 on the inner side surfaces of the plurality of grooves are provided on the outer surface of the first end plate portion 81, respectively. And a socket 87 arranged therein. As shown in FIG. 7, the outer surface of the second end plate portion 82 is provided with an engagement hole 88 into which a later-described latch bolt 68 is engaged and the above-mentioned USB terminal 84.

FIG. 9 shows the storage unit 6 in which the battery unit 50 is stored. The storage portion 6 is a space having a rectangular planar shape surrounded by side wall portions 61 and 62 along the length direction, a front wall portion 63 and a rear wall portion 64 made of synthetic resin.
As shown in FIG. 10, the rear wall portion 64 is provided with a plug 66 including a plurality of connecting terminals 65 and a recess 67 for alignment. Each connection terminal 65 can be inserted into and removed from each groove of the socket 87 of the battery unit 50. When each connection terminal 65 comes into contact with the drive terminal 86 and becomes conductive, the auxiliary drive device 4 and the battery 51 are electrically connected. The positioning concave portion 67 fits the positioning convex portion 85 of the battery unit 50, and when both are fitted, the battery unit 50 is properly set in the storage portion 6.

As shown in FIG. 11, the front wall portion 63 is provided with a latch bolt 68 and a pushing mechanism 9. The latch bolt 68 is biased forward by a spring (not shown) and projects from the wall surface. When the battery unit 50 is fitted into the storage portion 6, the latch bolt 68 is retracted and then receives the spring force to project and engage with the engagement hole 88 of the battery unit 50. The battery unit 50 is held in the storage portion 6 by the engagement of the latch bolt 68 and the engagement hole 88, and the battery unit 50 cannot be taken out from the storage portion 6.

Inside the top tube 11, a cylinder lock (not shown) that constitutes the release operation mechanism 71 is provided. The release operation mechanism 71 is a means for releasing the engagement between the latch bolt 68 and the engagement hole 88, and the cylinder lock rotates the key hole 69 opened on the side surface of the top tube 11 and the key inserted into the key hole 69. Accordingly, a cylinder (not shown) that rotates integrally to retract the latch bolt 68 is provided. When a proper key is inserted into the key hole 69 and rotated while the latch bolt 68 and the engagement hole 88 are engaged with each other, the cylinder rotates integrally and is connected to the end portion of the cylinder (Fig. (Not shown) are interlocked with each other to retract the latch bolt 68, whereby the engagement between the latch bolt 68 and the engagement hole 88 is released. The actuating mechanism has the same structure as the mechanism for rotating the door knob to retract the latch bolt, and is well known, and therefore, detailed illustration of the structure and its description are omitted here. The latch bolt 68, the engagement hole 88, and the release operation mechanism 71 constitute a holding mechanism section 70.

As shown in FIG. 11, the pushing mechanism 9 includes a pin 90 that is supported so as to be vertically movable, and a spring (not shown) that biases the pin 90 upward. When the battery unit 50 is fitted into the storage portion 6, the pin 90 is pushed against the lower surface of the stepped portion 82a (shown in FIG. 7) of the second end plate portion 82 of the battery unit 50. When the latch bolt 68 is retracted by the key operation and disengaged from the engagement hole 88, the front end side of the battery unit 50 is pushed up by the pin 90 and pushed out from the storage section 6. This allows the battery unit 50 to be grasped and taken out by hand. The push-out mechanism 9 is not limited to the mechanically-operated structure described above, but may be an electrically-operated structure such as an electromagnetic solenoid or a piezoelectric element. The electromagnetic solenoid or piezoelectric element is energized by operation.

The electrically assisted bicycle 1 of the embodiment shown in FIG. 2 is different from the electrically assisted bicycle 1 of FIG. 1 in that the battery device 5 is assembled to the down tube 18, but the specific configuration of the battery device 5 is as shown in FIG. Since it is the same as the first embodiment, the description thereof is omitted here.

Prior to running the electrically assisted bicycle 1, after connecting a charging device to the charging terminal 83 provided in the battery storage case 8 to charge the battery 51, the battery unit 50 is inserted from the opening 60 of the top tube 11 into the storage portion 6. When the cover plate portion 7 is fitted into the opening 60 and the opening 60 is closed, the latch bolt 68 of the holding mechanism 70 is engaged with the engagement hole 88 to maintain the lid-covered state. Since the opening portion 60 is formed on the outer peripheral surface of the top tube 11, the work of inserting the battery unit 50 into the storage portion 6 is easy. In the state where the battery unit 50 is stored, the drive terminal 86 of the battery unit 50 comes into contact with the connection terminal 65 of the storage unit 6 to conduct electricity, and the battery 51 supplies power to the auxiliary drive device 4. Further, in the battery storage state, the battery unit 50 is invisible from the outside and has a good appearance.

When the vehicle is stopped, the latch bolt 68 of the holding mechanism portion 70 is disengaged from the engagement hole 88 by a key operation, the lid plate portion 7 is removed from the opening 60 of the top tube 11, and the battery unit 50 is stored in the storage portion 6. Take out more. In this case, in the foldable electric assist bicycle of FIG. 2, it is not necessary to fold the vehicle body to take out the battery unit 50. The battery unit 50 can be carried around by being taken out from the storage unit 6, and the battery unit 50 can be charged by connecting an external power supply to the charging terminal 83.

DESCRIPTION OF SYMBOLS 1 Electric power assisted bicycle 2 Joint part 4 Auxiliary drive device 5 Battery device 6 Battery unit storage part 7 Cover plate part 8 Battery storage case 9 Extrusion mechanism 11 Top tube 18 Down tube 50 Battery unit 51 Battery 60 Opening 65 Connection terminal 68 Latch Bolt 69 Keyhole 70 Holding mechanism 71 Release operation mechanism 83 Charging terminal 86 Driving terminal 88 Engagement hole

Claims (10)

An electrically assisted bicycle equipped with an auxiliary drive device and a battery device,
The battery device closes an opening formed in the outer peripheral surface of the frame member and a battery unit storage portion provided inside a frame member forming a vehicle body, the battery unit storage portion having a connection terminal electrically connected to the auxiliary drive device. An openable and closable lid plate portion, and a battery unit that is inserted into and removed from the battery unit storage portion through the opening,
The battery unit includes a battery, a charging terminal for charging the battery, and a drive for electrically connecting the auxiliary drive device and the battery by contacting the connection terminal when stored in the battery unit storage section. Electric assisted bicycle equipped with a terminal. The electric power-assisted bicycle according to claim 1, wherein the lid plate portion is supported on a peripheral edge of the opening portion and constitutes an outer peripheral surface of a frame member in a covered state. The electric assisted bicycle according to claim 1, wherein the frame member has the opening formed on one of an outer peripheral surface of the frame member facing upward and a lateral surface thereof. The frame member is a top tube, has a folded portion and a joint portion that joins the folded portion at an intermediate position in the longitudinal direction, and the battery unit storage portion and the battery unit storage portion at a position on the front side with respect to the joint portion. The electrically assisted bicycle according to claim 1, wherein the opening is provided. The said frame member is a down tube, The said battery unit storage part and the said opening part are provided in the intermediate position of a length direction, The electrically-assisted bicycle of Claim 1 or 3. The electric assist bicycle according to claim 1, wherein the battery unit has a battery storage case for storing a battery, and the lid plate portion constitutes a part of a wall of the battery storage case. The electric assist bicycle according to any one of claims 1 to 6, further comprising a holding mechanism section that holds a cover state of the cover plate section. The holding mechanism section includes a latch bolt that is provided at one end of the battery unit storage section and that is biased to project into the battery unit storage section, and an engaging member that is provided in the battery unit and that can engage with the latch bolt. The electric assist bicycle according to claim 7, further comprising a dowel hole and a release operation mechanism that retracts the latch bolt to release the engagement with the engagement hole. The release operation mechanism includes a cylinder lock, and the cylinder lock is rotated by operating a key hole opened on the outer peripheral surface of the frame member and a key inserted into the key hole to retract the latch bolt. The electric assist bicycle according to claim 8, further comprising a cylinder. The electric power-assisted bicycle according to any one of claims 7 to 9, further comprising a push-out mechanism that is provided at one end of the battery unit storage section and urges one end of the battery unit toward the opening. Electric assisted bicycle.