WO2017037843A1

WO2017037843A1 - Battery pack for two-wheel and three-wheel electric vehicles and device for charging said battery pack

Info

Publication number: WO2017037843A1
Application number: PCT/JP2015/074751
Authority: WO
Inventors: 正太郎鈴木; 裕良金子
Original assignee: 株式会社ベルニクス; 国立大学法人埼玉大学
Priority date: 2015-08-31
Filing date: 2015-08-31
Publication date: 2017-03-09
Also published as: CN209305372U

Abstract

Battery packs 30, 130 mounted in an electrically assisted bicycle, etc., wherein said battery packs 30, 130 are provided with an accommodating case 31 for accommodating battery cells, power receiving coils 40, 140 for non-contact feeding transformers fixed to an outer wall surface or an inner wall surface of the accommodating case 31 to charge the battery cells in a non-contact manner, and feeder coil mounting units for detachably mounting feeder coils for the non-contact feeding transformers at positions opposing the receiving coils. The battery packs perform non-contact charging as long as feeder cases 50 enclosed in the power receiving coils are mounted on the feeder coil mounting units of the battery packs while mounted on an electrically-assisted bicycle.

Description

Battery pack and charging device for electric motorcycles and tricycles

The present invention relates to a battery pack mounted on an electric two-wheeled or three-wheeled vehicle such as an electric assist bicycle or an electric motorcycle, and a charging device for charging the battery pack.

In recent years, electrically assisted bicycles have rapidly spread and various electrically assisted bicycles are commercially available from many manufacturers. In addition, there are increasing cases of renting out electric assist bicycles as rental bicycles.
Electric assist motorcycles and tricycles are equipped with a rechargeable battery pack, and a bicycle motor is rotated by electric power supplied from the battery pack.

Although the battery pack has a different shape for each manufacturer of the electric assist bicycle, as described in Patent Document 1 below, the battery pack has a structure as shown in FIG.
A handle 53 is integrally formed on the upper portion of the housing case 52 made of plastic, and the battery pack can be transported and taken in and out of the bicycle storage box with the handle 53. The housing case 52 houses a plurality of cell units 61 in which lead plates 65 are arranged on both end faces of a large number of parallel battery cells 62, and further houses a circuit board 71 and a connector 72.

In FIG. 15, the output connector 72 and the charging connector 73 are separately illustrated as connectors. However, Patent Document 1 describes that these may be shared by one.
A control circuit including a CPU is mounted on the circuit board 71, and a cable from the connector and a lead wire from the cell unit are connected, and the control circuit executes charging control of the battery cell.
The battery pack also includes an LED lamp 92 that displays the remaining charge when the switch 91 is pressed. The number of LED lamps 92 corresponding to the charging rate is lit. The control circuit also executes display control of the remaining charge amount.

However, in order to charge the battery pack, it takes much time to remove the battery pack from the bicycle and set it in the charger, or to attach the charged battery pack to the bicycle. In addition, when the plug at the end of the cord is inserted into the battery pack that is still attached to the bicycle for charging, a connector contact failure tends to occur due to frequent insertion and removal. Further, there is a risk that the conductive part exposed from the case of the battery pack gets wet due to rain water or car wash water, resulting in electric shock. Furthermore, the charger may be damaged due to a short circuit caused by rainwater.
In view of these points, Patent Document 2 below proposes an apparatus for charging a battery pack of an electrically assisted bicycle by non-contact power supply based on electromagnetic induction action.

By the way, the system which performs non-contact electric power feeding has the circuit structure shown in FIG. 16, as is well known.
The power supply side includes a DC supply unit 11 that supplies direct current, a high-frequency oscillation circuit (inverter or the like) 12 that converts direct current into high-frequency alternating current, a primary coil (power supply coil) 14 of a non-contact power supply transformer, and a high-frequency oscillation circuit. And a capacitor 13 connected between the primary side coil.
On the other hand, the power receiving side includes a secondary coil (power receiving coil) 15 of the non-contact power supply transformer, a rectifier circuit 17 that rectifies the alternating current received by the secondary coil, and a smoothing capacitor 18 that smoothes the output of the rectifier circuit. And a load 19 to which a rectified current is supplied, and a capacitor 16 connected between the secondary coil and the rectifier circuit. In the non-contact charging system, the load 19 is a battery pack.
The power supply side capacitor 13 and the power reception side capacitor 16 are connected to increase the power supply efficiency by compensating the leakage reactance of the non-contact power supply transformer having a gap between the primary side coil and the secondary side coil. As shown in FIG. 16, a system in which a series capacitor 13 is connected to the primary side and a parallel capacitor 16 is connected to the secondary side, a system in which series capacitors are connected to both the primary side and the secondary side, and the like are known. Yes.

In the non-contact power feeding device described in Patent Document 2, as shown in FIG. 17A, the battery pack 2 is disposed at the lower part of the saddle of the bicycle, and the secondary coil is accommodated in the lower space of the rear cargo bed. The power receiving unit 20 is disposed, and the battery pack 2 and the power receiving unit 20 are connected by a cable. The power supply side has a power supply stand 23 in which the high-frequency oscillation circuit 9 is built, and a power supply unit 21 that houses the primary side coil is connected to the power supply stand 23 by a cable 10.
As shown in FIG. 17B, the power feeding unit 21 has a resin case 22 that houses the primary coil 4, and the power receiving unit 20 has a resin case 26 that houses a pair of secondary coils 6. . The resin case 26 of the power receiving unit includes an insertion space S in which the resin case 22 of the power feeding unit is inserted between the pair of secondary coils 6, and the resin case 22 of the power feeding unit is inserted into the insertion space S. Thus, charging using non-contact power feeding (non-contact charging) is performed.

JP 2013-177106 A JP 2012-039831 A

Battery packs and chargers for electric-assisted bicycles that are currently on the market vary from bicycle manufacturer to bicycle manufacturer, so even if you try to charge the battery pack at the destination of the bicycle, you can bring a charger or a suitable charger. The battery cannot be charged unless it is available at the destination.
If power-assisted bicycle power supply stands are installed in public facilities and private facilities so that users can use them easily, it is expected that the convenience of electric-assisted bicycles will improve and the number of people who ride them will increase. Under the current situation where the battery packs and chargers of each manufacturer are not compatible, it is difficult to realize such a concept.

In addition, as described in Patent Document 2, non-contact charging of the battery pack for bicycles can be performed while mounted on the bicycle, there is no risk of electric shock, deterioration due to wear of the connector, etc. Although it has many advantages, it is unlikely that manufacturers that are trying to differentiate themselves from other companies to increase their share will adopt a standard battery pack for contactless charging.
Even if it is decided to adopt it, it will be necessary to continue to build old battery packs and chargers for maintenance of electric assist bicycles sold in the past, which will increase the burden on manufacturers.

The present invention has been created in view of such circumstances, and is mounted on an electric two-wheeled bicycle, an electric three-wheeled bicycle, or an electric motorcycle (in this specification, they are collectively referred to as “electric two-wheeled / tricycle”). Provided is a battery pack that can be contactlessly charged with a slight modification to an existing battery pack, and can be charged in a conventional manner, and the battery pack is charged. The object is to provide a charging device.

The present invention is a battery pack that is mounted on an electric motorcycle or tricycle and supplies electric power to a motor of the electric motorcycle or tricycle. The battery pack accommodates a battery case and a storage case for non-contact charging of the battery cell. A power receiving coil of a non-contact power supply transformer fixed to the outer wall surface or the inner wall surface of the side wall, and a power supply coil mounting portion in which the power supply coil of the non-contact power supply transformer is detachably mounted at a position facing the power receiving coil. It is characterized by.
This battery pack can be contactlessly charged while mounted on an electric motorcycle or tricycle.

Further, in the battery pack of the present invention, the power receiving case containing the power receiving coil is fixed in a state where one surface of the main plane is in surface contact with the outer wall surface of the side wall of the housing case, and the power feeding coil mounting portion is fixed to the power receiving case. It may be provided on the other exposed surface of the main plane.
In the battery pack of the present invention, the power receiving coil is fixed in a state of being in surface contact with the inner wall surface of the side wall of the housing case, and the side wall of the housing case is arranged so that the feeding coil mounting portion faces the power receiving coil through the side wall. It may be provided on the outer wall surface.
In either case, non-contact power feeding is possible by bringing the power supply case in which the power supply coil of the non-contact power supply transformer is built into surface contact with the position of the power receiving coil.

In the battery pack of the present invention, it is desirable to provide an engagement portion that engages with a power supply case with a built-in power supply coil in the power supply coil mounting portion.
By providing the engaging portion, the power receiving coil and the power feeding coil of the power feeding case are accurately opposed to each other at a specified position, and highly efficient non-contact charging is performed.

As the engaging portion, one or more protrusions or holes may be provided and engaged with holes or protrusions provided on the main plane of the power supply case.
Further, the engaging portion may be configured by a pair of L-shaped frames that support the power supply case, and the pair of L-shaped frames may be separated and opposed in a line-symmetric state.
By doing so, the power supply case can be stably held on the outer wall surface of the battery pack. Moreover, since the L-shaped frame is not connected, there is no possibility of rainwater collecting.

Further, as the engaging portion, an insertion hole into which the power supply case is inserted in contact with the outer wall surface of the housing case may be provided, and a gap may be provided on the bottom surface of the insertion hole that supports the lower surface of the power supply case.
By carrying out like this, a power feeding case can be stably hold | maintained on the outer wall surface of the storage case of a battery pack. Moreover, since there is a gap in the bottom surface of the insertion hole, there is no possibility of rainwater collecting.

Moreover, in the battery pack of this invention, a receiving coil and a feeding coil can be comprised with the coil wound flatly.
In the battery pack of the present invention, the power receiving coil and the power feeding coil may be wound around a flat core.

Further, in the present invention, when the battery pack is mounted on the electric motorcycle / tricycle, the receiving coil is fixed to the side wall of the housing case that appears on the side surface of the electric motorcycle / tricycle, and the feeding coil mounting portion faces the receiving coil. It is desirable to arrange.
When a battery pack is mounted on an electric motorcycle or tricycle, there may be a vehicle frame in the vicinity of the side wall in the front-rear direction of the electric motorcycle or tricycle among the side walls of the housing case. Since the frame does not exist on the side of the side wall that faces the side, it is easy to attach the power supply coil to the power supply coil mounting portion.

Moreover, the battery pack of this invention may be provided with the connector for electrically connecting with the charger for battery cell charge.
By doing so, it becomes possible to perform non-contact charging while the battery pack is attached to the electric motorcycle / tricycle, or to remove the battery pack from the electric motorcycle / tricycle and to charge the battery pack in a conventional manner using a charger.

In addition, the charging device of the present invention has a power supply case with a built-in power supply coil mounted on the power supply coil mounting portion of the battery pack, a high-frequency power source that generates high-frequency alternating current supplied to the power supply coil, and one end connected to the high-frequency power source The other end of which is connected to the power supply coil of the power supply case, a cord winding unit that winds the cord, and a case body that houses the high-frequency power source and the cord winding unit. The cord is pulled out from the case body so that the case reaches a battery pack mounted on the electric motorcycle / tricycle.
When charging the battery pack, pull the cord from the case body with the power supply case in your hand. When non-contact charging is completed, the cord is wound into the case body.

In addition, the charging device of the present invention has a riding board that is tilted around a fulcrum by the weight of the electric motorcycle or tricycle when the wheels of the electric motorcycle or tricycle ride on, and is fixed to the riding board, and the riding board tilts. A stand whose upper part approaches the side of the electric motorcycle / tricycle, and a power supply case holding part for holding a power supply case with a built-in power supply coil via a ball joint at the upper part of the stand. When a wheel of an electric two-wheeled or three-wheeled vehicle rides on, the main plane of the power supply case is in surface contact with a power supply coil mounting portion of a battery pack mounted on the electric two-wheeled or three-wheeled vehicle.
In this charging apparatus, when the wheel of an electric motorcycle or tricycle is placed on the riding board, the non-contact charging is automatically enabled.

According to the present invention, non-contact charging becomes possible by attaching a power receiving coil to the outer wall surface or inner wall surface of each bicycle manufacturer's battery pack. This battery pack also enables conventional charging by connecting the connector to the charger, allowing each bicycle manufacturer to add non-contact charging to the product while maintaining continuity with the previous product. You can have it. The individual user of the battery pack can continue to use the charger already possessed only by increasing the number of charging options, and does not suffer a disadvantage.
Therefore, standardization to non-contact charging can be easily realized using the battery pack of each bicycle manufacturer.
With this standardization, it is expected that many non-contact charging stations will be installed in public and private facilities, and the development and expansion of the charging environment for electric motorcycles and tricycles will further improve the convenience of electric motorcycles and tricycles. Let

This standardization also makes it possible to launch a rental system and a sharing system for electrically assisted bicycles at a low cost, so that electrically assisted bicycles can be used in various scenes.
The battery pack can be easily charged at the non-contact charging station without removing the battery pack from the electric motorcycle or tricycle. In addition, there is no risk of electric shock even when it gets wet in the rain, and there is no worry of poor connection due to deterioration of contact wear.
Therefore, it is possible to reduce the burden of management and monitoring in the bicycle parking lot of public facilities, private facilities, rental systems and sharing systems provided with non-contact charging stations.

The figure which shows the battery pack (a) (b) and electric power feeding case (c) which concern on embodiment of this invention. The figure which shows the state with which the battery pack of FIG. 1 was mounted in the electrically assisted bicycle. The figure which shows the circuit structure of the battery pack of FIG. The figure which shows the non-contact charging device which concerns on embodiment of this invention The figure which shows the circuit structure of the non-contact charging device of FIG. The figure which shows the flow of the magnetic flux of the non-contact electric power feeding transformer which consists of a flat feeding coil and a receiving coil The figure which shows the state which charges a battery pack with the non-contact charging device placed directly on the ground surface The figure which shows the state which installed the non-contact charging device of FIG. 7 on the stand The figure which shows the bicycle parking lot where the stand of Figure 8 is installed plurally The figure which shows the modification of a feeding coil and a receiving coil The figure which shows the other example of a feed coil and a receiving coil The figure which shows the modification 1 of an electric power feeding case holding part The figure which shows the modification 2 of an electric power feeding case holding part The figure which shows the stand which sets to non-contact charge automatically with the weight of the bicycle Diagram showing a conventional battery pack The figure which shows the circuit constitution of non-contact electric power feeding The figure which shows the bicycle which performs the conventional non-contact charge, and its non-contact electric power transformer

1 (a) and 1 (b) show battery packs 30 and 130 to which a non-contact charging function is added. In the battery pack 30 of FIG. 1A, a flat power receiving case 40 incorporating a power receiving coil of a non-contact power supply transformer is fixed to the outer wall surface of a housing case 31 that houses battery cells. Only the presence of the power receiving case 40 is different from the conventional battery pack.
Moreover, the battery pack 130 of FIG.1 (b) has the receiving coil fixed to the inner wall surface of the storage case 31, and in FIG.1 (b), the receiving coil fixing area | region 140 of the inner wall surface in which a receiving coil exists is shown with a dotted line. Is shown. The battery pack 130 is the same as the conventional battery pack except for a protrusion 143 described later.
As shown in FIG. 2, the outer wall surface of the housing case 31 to which the power receiving case 40 is fixed is the surface of the housing case that appears on the side surface of the battery-assisted bicycle when the battery pack 30 is mounted on the battery-assisted bicycle. The power receiving case 40 is fixed so that its main surface is in surface contact with the outer wall surface.
The same applies to the case where the power receiving coil is fixed to the inner wall surface of the housing case 31, and the flat power receiving coil is fixed to the inner wall surface of the housing case 31 that appears on the side surface of the electrically assisted bicycle in a surface contact state.
Hereinafter, the battery pack 30 having the power receiving case 40 fixed to the outer wall surface of the housing case 31 will be described, but the same applies to the battery pack 130 having the power receiving coil fixed to the inner wall surface of the housing case 31.

FIG. 3 shows a circuit configuration that enables a non-contact charging function added to the battery pack 30. The power receiving coil (secondary coil) 401 wound in a flat shape is connected to the rectifier circuit 17 with the capacitor 16 interposed therebetween, and the alternating current received by the power receiving coil 401 is converted into direct current. The DC output of the rectifier circuit 17 is smoothed by the smoothing capacitor 18 and input to the charge control circuit 42, and the charge control circuit 42 controls the charging of the battery cell 43. In addition, this circuit includes a remaining battery level circuit 44 that displays the remaining battery level using the LED 45.

In this circuit configuration, the power receiving coil 401 is accommodated in the power receiving case 40. The capacitor 16, the rectifier circuit 17, and the smoothing capacitor 18 are mounted on a circuit board in the housing case 31, for example, a circuit board 71 shown in FIG. The power receiving coil 401 is electrically connected to the circuit board 71 by an electric wire or the like that penetrates the side wall of the housing case 31.
The charge control circuit 42, the battery cell 43, the battery remaining amount circuit 44, and the remaining amount display LED 45 are provided in a conventional battery pack as shown in FIG. 15, and can be used.
Accordingly, the power receiving case 40 that houses the power receiving coil 401 is fixed to the outer wall surface of the housing case 31, and the capacitor 16, the rectifier circuit 17, and the smoothing capacitor 18 are added to the circuit board in the housing case 31, and the power receiving coil is added to the circuit board. If 401 is electrically connected, non-contact charging becomes possible.

On the other hand, as shown in FIG. 4A, the non-contact charging device 60 converts a commercial power supply AC power into a DC power, and then converts the AC power into a high-frequency AC, and a flat power supply incorporating a feeding coil. Case 50, a cord 58 that connects the power supply coil of power feeding case 50 and high-frequency power source 56, a cord winder 57 that winds this cord 58, and a plug that transmits AC power from a commercial power source to high-frequency power source 56 51 and a cord 54, and a high-frequency power source 56 and a cord winder 57 are accommodated in a case 55.
As shown in FIG. 4B, at the time of non-contact charging, the cord 58 is pulled out from the case 55 and the power supply case 50 is joined to the power receiving case 40 of the battery pack 30. The place where the power supply case 50 is joined in the power receiving case 40 is a “power supply coil mounting portion” in the claims.

As shown in FIGS. 1A and 1C, the exposed surface of the power receiving case 40 is provided with a protrusion 403 for engaging with the power supply case 50, and the protrusion 403 is fitted into the power supply case 50. A matching hole 503 is provided. At the time of non-contact charging, the hole 503 of the power supply case 50 is fitted to the protrusion 403 of the power reception case 40 to define the position of the power supply case 50 with respect to the power reception case 40.
Further, in the case of the battery pack 130 in which the power receiving coil is fixed to the inner wall surface of the housing case 31, a protrusion 143 is provided on the outer wall surface of the housing case 31 corresponding to the power receiving coil fixing region 140 as shown in FIG. Thus, a “feeding coil mounting portion” is formed, and the hole 503 of the feeding case 50 is fitted into the protrusion 143 to define the position of the feeding case 50 during non-contact charging.
The protrusion may be provided on the power supply case 50 side, and the hole may be provided on the outer wall surface of the power receiving case 40 or the housing case.

FIG. 5 shows an example of a circuit configuration of the non-contact charging device 60 that supplies power to the power receiving side circuit of FIG. 3.
The high-frequency power source 56 includes an AC adapter 561 that lowers the commercial AC voltage, a rectifier 562 that rectifies the output, a smoothing capacitor 563 that smoothes the pulsating current output from the rectifier 562, and a smoothed DC voltage. A DC-DC converter 564 to be changed and an inverter 12 for converting a direct current output from the DC-DC converter 564 into a high-frequency alternating current are provided. The high-frequency alternating current output from the inverter 12 is flattened through a capacitor. Is supplied to a feeding coil (primary coil) 501 wound around the wire.
FIG. 6 shows the flow of magnetic flux when power is fed by electromagnetic induction between the feeding coil 501 and the receiving coil 401 wound in a flat shape.

FIG. 7 schematically shows a state in which the power supply case 50 drawn out from the case 55 of the non-contact charging device is joined to the power receiving case 40 of the battery pack 30 mounted on the electric assist bicycle.
Further, as shown in FIG. 8A, the non-contact charging device can be detachably coupled to the stand 75 by inserting the foot 551 provided on the case 55 into the hole 751 provided on the upper side of the stand 75. (FIG. 8B).
FIG. 9 schematically shows a bicycle parking lot in which a plurality of stands 75 coupled with the case 55 of the non-contact charging device are installed to enable non-contact charging to a plurality of electrically assisted bicycles.

Thus, the battery pack 30 can be charged using the non-contact charging device 60 while being mounted on the electrically assisted bicycle. In the case of non-contact charging, the power supply case 50 is pulled out from the case 55 of the non-contact charging device connected to the commercial power source, and the power supply coil mounting part of the power receiving case 40 of the battery pack 30 or the power supply coil mounting part of the outer wall surface of the battery pack 30 is used. Because it only combines, it does not take much effort. It can be safely charged even if it rains or snows.
The battery pack 30 can also be charged by a conventional method in which the battery pack 30 is detached from the electrically assisted bicycle and electrically connected to a charger.

The non-contact charging device 60 can be used by placing the case 55 directly on the ground or floor, or by connecting the case 55 to a stand 75. The latter form is suitable for installing charging facilities in places where many people use, such as public facilities, private facilities, bicycle rental systems, and sharing systems. And expansion can be realized at low cost. In addition, the operation for charging the battery pack 30 mounted on the electrically assisted bicycle in a non-contact manner can be easily and safely performed by the user himself, so that a large burden is not required for managing the charging facility.

(Modification 1 of power receiving coil and power feeding coil)
The receiving coil and the feeding coil may have shapes other than those shown in FIG.
FIG. 10 shows a flat coil in which an electric wire is wound around a plate-shaped core.
10A, ferrite cores 411 constituting magnetic poles are arranged on both sides of a plate-like ferrite core 410, and an electric wire 420 is wound around the portion of the plate-like ferrite core 410 between the magnetic poles.
As shown in FIG. 10B, this flat coil enables efficient non-contact charging when the magnetic pole ferrite cores 411 of the power feeding coil and the power receiving coil face each other. Reference numeral 431 in FIG. 10B denotes a main magnetic flux that circulates between the power receiving coil and the power feeding coil during non-contact charging.
In this case, it is desirable to arrange the aluminum plate 430 in order to block the leakage magnetic flux leaking to the non-opposing side of the power receiving coil and the power feeding coil.
Further, as shown in FIG. 10C, the flat coil may be configured by winding an electric wire 420 around a portion excluding both ends of the plate ferrite core 410. In this case, both end portions of the plate-like ferrite core 410 become magnetic poles.
Further, as shown in FIG. 10D, the width dimension of the plate-like ferrite core 410 is set to the magnetic pole ferrite core 411 so that the plate-like ferrite core 410 and the magnetic pole ferrite core 411 form an H shape in a plan view. The flat coil may be formed by winding the wire 420 around the plate-like ferrite core 410 and shortening the length of the plate-like ferrite core 410.

(Modification 2 of a receiving coil and a feeding coil)
The power receiving coil built in the power receiving case 40 and the power feeding coil built in the power feeding case 50 may have a coil shape other than flat.
FIG. 11 shows a power receiving coil 402 configured by winding an electric wire around a rod-shaped core 481. On the other hand, the feeding coil 502 includes a core having a U-shaped cross section composed of plate-

like cores

582 and 583 facing each other in parallel, and a plate-like core 584 orthogonal thereto, and an electric wire wound around the plate-like core 584. It consists of
The power receiving coil 402 is positioned so as to enter between the opposing

plate cores

582 and 583 of the power feeding coil 502 during non-contact power feeding. Reference numeral 585 in FIG. 11 indicates a magnetic flux circulating between the power receiving coil 402 and the power feeding coil 502 during non-contact charging.

(Modification of the power supply case engaging part)
12 and 13 show a modification of the power supply case positioning engagement portion of the power supply coil mounting portion provided on the outer wall surface of the battery pack in which the power receiving coil is fixed to the inner wall surface.
The engaging portion of FIG. 12 includes a pair of L-shaped frames 180 fixed in a line-symmetric state on the outer wall surface corresponding to the power receiving coil fixing region 140 of the housing case 31 as shown in FIG. ing. Each L-shaped frame 180 is formed with a notch on the outer wall surface side so that a groove 181 corresponding to the thickness of the power supply case 50 (FIG. 12B) is formed between the L-shaped frame 180 and the outer wall surface of the housing case 31. ing. Further, the pair of L-shaped frames 180 are fixed to the outer wall surface with a gap so that a gap is formed between the lower frame portions.
When the power supply case 50 is inserted into the grooves 181 of the pair of L-shaped frames 180 from above, the power supply case 50 is held in close contact with the outer wall surface corresponding to the power receiving coil fixing region 140.
Moreover, since the lower side frame part of a pair of L-shaped flame | frame 180 is not connected, there is no possibility that rainwater will accumulate.

The engaging portion in FIG. 13 has a basic structure equivalent to that covering the front side of the L-shaped frame 180 in FIG. 12A, and as shown in FIG. The feeding case 50 is inserted and held in the inserted hole 182. Similar to the bottom frame portion of FIG. 12A, the bottom surface of the insertion hole 182 that supports the lower portion of the power supply case 50 is partially provided with a gap so that rainwater does not collect.
FIG. 13 (b) shows a part of the resin portion constituting the insertion hole 182 of the engaging portion removed. An aluminum plate 183 is embedded in the resin portion surrounding the front surface and the left and right side surfaces of the insertion hole 182, and leakage flux is blocked by the aluminum plate 183.
The engaging portion shown in FIGS. 12 and 13 can stably hold the power supply case 50 on the outer wall surface of the battery pack in which the power receiving coil is fixed to the inner wall surface.

(Modification of power supply side stand)
The power supply side stand shown in FIG. 14 is configured such that the power supply case 50 is automatically joined to the power supply coil mounting portion of the battery pack 30 according to the weight of the electrically assisted bicycle. Therefore, non-contact charging is possible without bothering human hands.
As shown in FIG. 14A, the power supply side stand includes a riding board 81 on which the rear wheel of the electric assist bicycle rides, an arm part 82 standing upright from an end part of the riding board 81, and an upper end of the arm part 82. A power supply case holding portion 83 for holding the power supply case 50, and the power supply case 50 is coupled to the power supply case holding portion 83 via a ball joint 84.
The riding board 81 is supported on the ground by a leg part 87 provided on the extension of the arm part 82, a spring 85 for supporting the end of the riding board 81 on the side where the arm part 82 does not exist, and a leg part 87. The projection 86 is located in the middle of the spring 85 and serves as a fulcrum when the riding board 81 tilts.

As shown in FIG. 14B, when the rear wheel 900 of the electrically assisted bicycle rides on the riding board 81, the spring 85 sinks by its weight, and the riding board 81 tilts with the protrusion 86 as a fulcrum. Therefore, the upper end of the arm portion 82 is closer to the electrically assisted bicycle, and the power supply case 50 held by the power supply case holding portion 83 is connected to the power receiving case 40 or the housing case 31 provided with the power supply coil mounting portion of the battery pack 30. It is pressed against the receiving coil fixing region 140. Since the power feeding case 50 is held by the power feeding case holding portion 83 via the ball joint 84, the angle can be freely changed. The power feeding case 50 pressed against the power receiving case 40 or the housing case 31 is It joins with the outer wall surface of the receiving case 40 or the receiving coil fixing area | region 140 in the state which the main surface contacts.
Therefore, highly efficient non-contact power feeding is performed between the power feeding coil housed in the power feeding case 50 and the power receiving coil housed in the power receiving case 40 or the power receiving coil fixed to the inner wall surface of the housing case 31.

In addition, although charging of an electrically assisted bicycle has been described here, the present invention can also be applied to a motorcycle such as an electric motorcycle. Further, the present invention can also be applied to an electric three-wheeled bicycle or an electric three-wheeled motorcycle having a single front wheel.

The battery pack and the charging device of the present invention enable non-contact charging that is easy to operate and highly safe, and can be widely used for electric bicycles, electric motorcycles, electric tricycles, electric tricycles, and the like.

30 Battery Pack 31 Storage Case 40 Power Receiving Case 42 Charge Control Circuit 43 Battery Cell 44 Battery Remaining Circuit 45 LED
50 Power Supply Case 51 Plug 52 Housing Case 54 Cord 55 Case 56 High Frequency Power Supply 57 Cord Winder 58 Cord 60 Non-Contact Charging Device 75 Stand 81 Riding Plate 82 Arm Portion 83 Power Feed Case Holding Portion 84 Ball Joint 85 Spring 86 Projection 87 Leg portion 130 Battery pack 140 Receiving coil fixing region 143 Protrusion 180 L-shaped frame 181 Groove 182 Insertion hole 183 Aluminum plate 401 Receiving coil (secondary coil)
402 Power receiving coil 403 Protrusion 410 Plate ferrite core 411 Ferrite core for magnetic pole 420 Electric wire 430 Aluminum plate 431 Magnetic flux 481 Rod core 501 Feed coil (primary coil)
502 Feeding coil 503 Hole 551 Foot 561 AC adapter 562 Rectifier 563 Smoothing capacitor 564 DC-DC converter 582 Plate-like core 583 Plate-like core 584 Plate-like core 585 Magnetic flux 751 Hole 900 Rear wheel

Claims

A battery pack that is mounted on an electric motorcycle / tricycle and supplies electric power to a motor of the electric motorcycle / tricycle,
A storage case for storing battery cells;
A power receiving coil of a non-contact power supply transformer fixed to an outer wall surface or an inner wall surface of a side wall of the housing case for non-contact charging the battery cell;
A power feeding coil mounting portion in which a power feeding coil of a non-contact power feeding transformer is detachably mounted at a position facing the power receiving coil;
A battery pack comprising:
2. The battery pack according to claim 1, further comprising a power receiving case including the power receiving coil, wherein the power receiving case is fixed in a state in which one surface of the main plane is in surface contact with the outer wall surface of the side wall, The battery pack, wherein the feeding coil mounting portion is provided on the other exposed surface of the main plane of the power receiving case.
2. The battery pack according to claim 1, wherein the power receiving coil is fixed in a state of surface contact with an inner wall surface of the side wall, and the power feeding coil mounting portion is opposed to the power receiving coil through the side wall. A battery pack provided on an outer wall surface of the side wall.
2. The battery pack according to claim 1, wherein the feeding coil mounting portion includes an engaging portion that engages with a feeding case in which the feeding coil is built.
5. The battery pack according to claim 4, wherein the engaging portion is one or more protrusions or holes, and the protrusions or holes are engaged with holes or protrusions provided on a main plane of the power supply case. Match
A battery pack characterized by that.
5. The battery pack according to claim 4, wherein the engaging portion is a pair of L-shaped frames that support the power supply case, and the pair of L-shaped frames are separated from each other in a line-symmetric state. Yes,
A battery pack characterized by that.
5. The battery pack according to claim 4, wherein the engaging portion is an insertion hole into which the power supply case is inserted in a state of being in contact with an outer wall surface of the side wall, and the insertion hole that supports a lower surface of the power supply case. There is a gap on the bottom,
A battery pack characterized by that.
The battery pack according to claim 1, wherein the power receiving coil and the power feeding coil are formed of a coil wound flatly.
A battery pack characterized by that.
The battery pack according to claim 1, wherein the power receiving coil and the power feeding coil are wound around a flat core.
A battery pack characterized by that.
2. The battery pack according to claim 1, wherein a side wall of the housing case in which the power receiving coil is fixed and the power feeding coil mounting portion is disposed to face the power receiving coil is configured to connect the battery pack to the electric motor. When mounted on a two-wheeled or tricycle, it is a side wall that appears on the side of the electric two-wheeled or tricycle.
A battery pack characterized by that.
The battery pack according to claim 1, further comprising a connector for electrically connecting to a battery cell charger.
A battery pack characterized by that.
A battery charger for non-contact charging the battery pack according to claim 1,
A power supply case with a built-in power supply coil mounted on the power supply coil mounting portion of the battery pack;
A high-frequency power source for generating high-frequency alternating current supplied to the feeding coil;
A cord having one end connected to the high-frequency power source and the other end connected to a feeding coil of the feeding case;
A cord winder for winding the cord;
A case main body for accommodating the high-frequency power source and the cord winding unit;
The cord is pulled out from the case body so that the power supply case reaches the battery pack mounted on the electric two-wheeled or tricycle at the time of non-contact charging.
A charging device characterized by that.
A battery charger for non-contact charging the battery pack according to claim 1,
A riding board that tilts around a fulcrum by the weight of the electric motorcycle / tricycle when the wheels of the electric motorcycle / tricycle get on,
A stand that is fixed to the riding board and the upper board approaches the electric motorcycle / tricycle when the riding board is inclined;
At the upper part of the stand, a power supply case holding part that holds a power supply case with a built-in power supply coil via a ball joint;
When a wheel of an electric two-wheeled or three-wheeled vehicle rides on the riding board, the main plane of the power supply case is in surface contact with a power supply coil mounting portion of a battery pack mounted on the electric two-wheeled or three-wheeled vehicle.
A charging device characterized by that.