WO2013011907A1 - Secondary-side power receiving apparatus, and charging stand and secondary-side power receiving apparatus - Google Patents

Secondary-side power receiving apparatus, and charging stand and secondary-side power receiving apparatus Download PDF

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Publication number
WO2013011907A1
WO2013011907A1 PCT/JP2012/067767 JP2012067767W WO2013011907A1 WO 2013011907 A1 WO2013011907 A1 WO 2013011907A1 JP 2012067767 W JP2012067767 W JP 2012067767W WO 2013011907 A1 WO2013011907 A1 WO 2013011907A1
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WO
WIPO (PCT)
Prior art keywords
power receiving
coil
power
receiving device
charging stand
Prior art date
Application number
PCT/JP2012/067767
Other languages
French (fr)
Japanese (ja)
Inventor
真一 板垣
玉井　幹隆
Original Assignee
三洋電機株式会社
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Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Publication of WO2013011907A1 publication Critical patent/WO2013011907A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/46—Accumulators structurally combined with charging apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/247—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for portable devices, e.g. mobile phones, computers, hand tools or pacemakers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0042—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by the mechanical construction
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present invention electromagnetically couples a power receiving coil of a secondary power receiving device mounted on a charging base and a power transmitting coil of the charging base, and carries power by magnetic induction from the power transmitting coil to the power receiving coil to charge a built-in battery.
  • the present invention relates to a possible secondary side power receiving device, and a combination of a charging base and a secondary side power receiving device that transmits power to the secondary side power receiving device.
  • Battery-driven devices represented by mobile devices such as mobile phones and portable music players are often driven by rechargeable batteries so that they are convenient to carry.
  • a battery-driven device stores a battery in a unit cell state or a battery pack state.
  • the battery-driven device is charged by connecting a contact to a charger in a state where the battery is accommodated.
  • a charging stand that charges the battery by transporting power to the receiving coil from the power transmission coil built in the charging stand using the action of electromagnetic induction without connecting the contacts in this way has been developed. (See Patent Document 1).
  • the charging base shown in Patent Literature 1 includes a power transmission coil 911 that is excited by an AC power supply in a charging base 910, and a power receiving coil 921 that is electromagnetically coupled to the power transmission coil 911 is connected to a battery pack 930.
  • the secondary battery cell 931 of the battery pack 930 is charged with electric power induced in the power receiving coil 921.
  • the battery pack 930 has a built-in charging circuit that rectifies the alternating current induced by the power receiving coil 921 and supplies it to the secondary battery cell 931 for charging.
  • the battery pack 930 is built in the battery driving device 920 for supplying power.
  • the battery pack 930 and the battery driving device 920 have a recess 922 for positioning with the charging base 910.
  • a convex portion 912 for positioning is provided at a position facing the concave portion 922.
  • the battery-driven device 920 is placed on the charging base 910, the concave portion 922 is inserted into the convex portion 912, and the secondary contact is made in a non-contact state without connecting a physical contact for electrical connection.
  • the battery cell 931 can be charged.
  • the battery driving device 920 and the battery pack 930 require a concave portion and a convex portion, the structure is not good in appearance.
  • the positioning disposed on the charging stand 100 as shown in FIG. Since the magnet 102 and the magnetic shield 37 are overlapped, the magnetic sheet 37 in this overlapping portion is saturated and the magnetic permeability is lowered, and the magnetic flux from the power transmission coil, the power receiving coil, and the positioning magnet 102 passes through the magnetic sheet 37, so that the magnetic The function of shielding the outer can of the secondary battery cell 12 disposed on the back surface of the body sheet 37 is impaired.
  • the power receiving coil 31 overlaps with a portion through which the magnetic flux of the magnetic shield 37 passes, and eddy current loss occurs in the outer can of the secondary battery cell 12 disposed on the back surface of the magnetic shield 37.
  • the inductance L value decreases, the contactless charging does not operate normally, and the loss increases.
  • the shielding effect of the magnetic sheet is enhanced, and even if the magnetic sheet is partially overlapped with the positioning magnet of the charging stand, sufficient shielding ability can be exhibited. Can be considered.
  • the present invention has been made to solve such conventional problems.
  • the main object of the present invention is to provide a secondary side power receiving device and a power receiving device capable of suppressing loss and charging even when placed on a charging stand using a positioning magnet without increasing the thickness of the magnetic sheet. It is to provide a power stand and a secondary power receiving device.
  • the secondary power receiving device is placed on a charging stand including a positioning magnet and can receive power from a power transmission coil built in the charging stand.
  • a secondary power receiving device which is a hollow power receiving coil 11 that can be electromagnetically coupled to the power transmitting coil 101 built in the charging stand 100, and a rectification control circuit that rectifies and outputs the power received by the power receiving coil 11.
  • the magnetic material sheet 17 disposed on the back surface of the power receiving coil 11 can be configured so that the hollow portion of the power receiving coil 11 and the positioning magnet 102 can be aligned by magnetic force. Thereby, since a magnetic material sheet is attracted
  • the inner diameter of the hollow portion of the power receiving coil 11 is made substantially equal to or larger than the outer diameter DM of the positioning magnet 102.
  • the power receiving coil 11 has a rectangular outer shape.
  • the rectangular power receiving coil can be further separated from the positioning magnet of the charging stand even with the same inner diameter as the circular power receiving coil.
  • the magnetic material sheet can be thinned by changing the shape of the coil.
  • the hollow portion of the power receiving coil 11 has an air-core shape.
  • the magnetic sheet can be exposed in the hollow portion of the power receiving coil, and the magnetic force of the positioning magnet can be directly received to increase the attractive force.
  • a thin wire can be used for the wire constituting the power receiving coil 11.
  • the wire diameter of the wire which can obtain required charging efficiency and resistance value can be made thinner than before.
  • the magnetic force of the positioning magnet can be directly received to increase the attractive force.
  • the magnetic sheet 17 is made of a soft magnetic ferrite that generates an attractive force by the magnetic force of the positioning magnet 102.
  • a magnetic material sheet can receive the magnetic force of a positioning magnet to the maximum by making it a ferrite of a soft magnetic material, and can increase an attractive force.
  • the power receiving device has a series capacitor 13 connected in series with the power receiving coil 11 to form a resonance circuit, and the capacitance of the series capacitor 13 is The power receiving coil 11 is adjusted to a value that provides a predetermined resonance frequency.
  • the secondary battery cell 12 installed on the back surface of the magnetic sheet 17 can be charged by the output from the rectification control circuit. Thereby, it can be set as the battery pack which made the secondary side power receiving apparatus and the secondary battery cell one set. Furthermore, the secondary battery cell can be prevented from being heated by the magnetic sheet.
  • the battery pack further includes a rechargeable secondary battery cell 12, and the secondary side power receiving device is connected to a battery driving device, While supplying electric power for driving the driving device from the secondary battery cell 12, the battery pack 10 is mounted on the charging stand 100 and can be charged by receiving electric power from a power transmission coil built in the charging stand 100.
  • the charging stand and the secondary power receiving device there is a charging stand 100 and a secondary power receiving device that is placed on the charging stand 100 and can receive power
  • the base 100 includes a positioning magnet 102 and a power transmission coil 101, and the secondary power receiving device receives the hollow power reception coil 11 that can be electromagnetically coupled to the power transmission coil 101 and the power reception coil 11.
  • a rectification control circuit that rectifies and outputs electric power, and a magnetic sheet 17 disposed on a back surface of the power receiving coil 11, and the power receiving coil 11 supplies the secondary power receiving device to the charging stand 100.
  • the inner diameter of the hollow portion of the power receiving coil 11 is substantially equal to or larger than the outer diameter DM of the positioning magnet 102 so that the positioning magnet can be disposed in the hollow portion of the power receiving coil 11 in the mounted state. It becomes Te. Thereby, when the battery pack is placed on the charging stand during charging, it is possible to avoid the overlapping of the positioning magnet and the power receiving coil, and to mitigate the influence of the magnetic properties of the magnetic material sheet and the power receiving coil being lowered by the positioning magnet.
  • FIG. 5A is a plan view illustrating a circular power receiving coil
  • FIG. 5B is a plan view illustrating a square power receiving coil according to the first embodiment.
  • FIG. 5A is a plan view illustrating a circular power receiving coil
  • FIG. 5B is a plan view illustrating a square power receiving coil according to the first embodiment.
  • each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
  • the contents described in some examples and embodiments may be used in other examples and embodiments.
  • the secondary-side power receiving device is a secondary-side power receiving device that can be electromagnetically coupled to the contactless primary-side charger.
  • This secondary-side power receiving device includes a power receiving coil and a rectification control circuit, and can be power that can supply power to an external load device.
  • a secondary-side power receiving device for example, a battery pack incorporating a secondary battery cell can be used.
  • the secondary-side power receiving device that is a battery pack supplies the power received from the charging stand to the secondary battery cell and charges it.
  • the secondary power receiving device is not limited to the one in which the battery pack is integrated, and may be an adapter that directly supplies power to the load device, for example. In the example of the secondary-side power receiving device shown in FIG.
  • a charging adapter 10 ′ including a power receiving coil that can be electromagnetically coupled to a power transmitting coil built in the charging stand 100 ′ is used.
  • the secondary power receiving device as the charging adapter 10 ′, the power transmitted from the charging stand 100 ′ without contact is supplied to the mobile phone that is the battery-driven device 50 ′ and is built in the mobile phone.
  • a secondary battery can be charged and a mobile phone can be driven.
  • charging can be performed by interposing a charging adapter that is a secondary power receiving device, and existing devices can be contactlessly charged. It can be.
  • the secondary power receiving device includes a power receiving coil that receives magnetic flux from the power transmitting coil, and further includes a magnetic sheet on the back of the power receiving coil.
  • a rectification control circuit including a sheet metal, a printed board, an electronic circuit, and the like that rectifies the power received by the power receiving coil is disposed.
  • the secondary side power receiving apparatus can use the induced electromotive force as the secondary power, and can further prevent the rectification control circuit from being heated by the magnetic flux by the magnetic sheet.
  • FIG. 1 is a perspective view of the battery pack placed on the charging stand according to the embodiment
  • FIG. 2 is a vertical sectional view of the charging stand and the battery pack shown in FIG. 1
  • FIG. 4 is a circuit diagram relating to a battery pack charging circuit
  • FIG. 5A is a plan view of a circular power receiving coil
  • FIG. 5B is a rectangular power receiving coil.
  • FIG. 6 is a perspective view showing a state in which the battery driving device to which the battery pack of FIG. 1 is connected is placed on the charging stand
  • FIG. 1 is a perspective view of the battery pack placed on the charging stand according to the embodiment
  • FIG. 2 is a vertical sectional view of the charging stand and the battery pack shown in FIG. 1
  • FIG. 4 is a circuit diagram relating to a battery pack charging circuit
  • FIG. 5A is a plan view of a circular power receiving coil
  • FIG. 5B is a rectangular power receiving coil.
  • FIG. 6 is a perspective view showing a state in which the battery driving device to
  • FIGS. 9 to 10 are drawing showing the battery driving device incorporating the battery pack according to the modification.
  • the perspective view which shows the mounted state is shown, respectively.
  • an example of a battery pack prototyped by the present inventors is shown in FIGS. 9 to 10 and will be described in comparison. (Charging stand 100)
  • FIG. 1 shows a battery pack 10 as a secondary power receiving device placed on a charging stand 100.
  • the charging stand 100 is a contactless charging stand that performs charging without contact.
  • the charging stand 100 is provided with a power input connector 103 as an input terminal for power. Further, power is supplied to the power input connector 103 by converting commercial power into DC power using an AC / DC adapter (not shown) and connecting the DC output connector 104 for supply.
  • the charging stand 100 is composed of a rectangular charging stand case 105 whose upper surface of the outer shape is a substantially flat mounting surface.
  • the charging stand case 105 can be made of, for example, a resin that does not disturb the magnetic flux.
  • the charging stand 100 has a high-frequency oscillation circuit that uses the power supplied from the power input connector 103 as high-frequency power.
  • This high frequency power is supplied as high frequency oscillated power to the power transmission coil 101 shown in the cross-sectional view of FIG.
  • the high-frequency oscillated power is energized in the power transmission coil 101 to generate magnetic flux, and an induced electromotive force can be generated in the power receiving coil 11 of the battery pack 10 disposed in proximity.
  • Parting magnet 102
  • the power transmission coil is a planar coil in which a hollow portion is formed at the center as shown in the plan view of FIG.
  • the charging stand 100 shown in the cross-sectional view of FIG. 2 has a positioning magnet 102 disposed in a hollow portion of the power transmission coil 101.
  • the positioning magnet 102 has a cylindrical shape with an outer diameter DM that is approximately the same as or slightly smaller than the size of the hollow portion of the power transmission coil 101.
  • the circular surface on the battery pack 10 side facing the upper surface of the charging base case 105 is an N pole or an S pole.
  • a power receiving coil 11 having a rectangular shape is used as the outer shape of the power receiving coil as shown in FIG.
  • the positioning magnet 102 performs positioning with the power receiving coil 11 of the battery pack 10 by using an attractive force due to magnetic force. Thereby, the power reception coil 11 in the battery pack 10 can be brought close to the transmission coil 101 of the charging stand 100, and the magnetic flux generated from the transmission coil 101 can be efficiently converted into an induced electromotive force.
  • the charging stand 100 using the positioning magnet 102 indicates the mounting position so that the battery pack or the battery driving device can be easily placed at a predetermined position on the upper surface of the charging stand case 105 as shown in FIG.
  • a mark 106 is preferably provided. The user places the battery pack or the battery-driven device in a rough position according to the mark 106 on the charging stand, whereby the battery pack or the battery-driven device can be positioned and electromagnetically coupled by the magnetic force of the positioning magnet 102.
  • the positioning magnet 102 used here preferably has a strong magnetic force.
  • the battery pack or the battery driving device placed on the mounting surface of the charging stand 100 can correct the position by magnetic force.
  • the weight of the battery pack or the battery driving device is set to a magnetic force that can move on the mounting surface of the charging stand 100, and preferably a neodymium positioning magnet 102.
  • the power receiving coil 11 is connected to the series capacitor 13 shown in FIG. 4 in series, and can be tuned to the power transmitting coil 101 to generate an induced electromotive force having a resonance frequency near the maximum.
  • This induced electromotive force can output and supply power to the secondary battery cell 12 via the synchronous rectification control circuit 14 as a rectification control circuit having a plurality of control circuits of the battery pack 10.
  • the synchronous rectification control circuit 14 converts high frequency power from the power receiving coil 11 and the series capacitor 13 into DC power by a rectification circuit and a smoothing circuit.
  • the secondary battery cell 12 can charge the converted DC power by a charging circuit (not shown) in the synchronous rectification control circuit 14.
  • the synchronous rectification control circuit 14 monitors the charging voltage, charging / discharging current, and battery temperature of the secondary battery cell 12. When the secondary battery cell 12 exceeds a predetermined threshold by this monitoring information, the charging of the secondary battery cell 12 can be stopped and the safety of the battery pack 10 can be improved.
  • the battery pack 10 in the embodiment shown in FIG. 2 has a magnetic sheet 17 that insulates the power receiving coil 11 from the secondary battery cell 12, and the power receiving coil 11 has a hollow space 16 in which the inner shape is hollow.
  • the exterior can be made of a resin such as plastic, or only the surface of the power receiving coil side where it joins the charging base can be a plastic film.
  • the secondary battery cell 12 built in the battery pack 10 is a rectangular parallelepiped that is thinner than the width, and can be formed as a metal case by forming an outer can in which each surface is integrally molded.
  • the metal case can be made of aluminum or the like, can be protected from exogenous impacts, and can have an excellent effect in terms of weight reduction and heat dissipation.
  • Such a secondary battery cell 12 is affected by electromagnetic induction as a component.
  • the secondary battery cell in this example uses a lithium ion secondary battery or a lithium polymer battery with a large volumetric energy density, so that the whole is light, thin, small and convenient, and further has an output power capacity. Since it can be enlarged, it has a feature that can be used for battery-powered devices.
  • the present invention is not limited to this, and the secondary battery cell can be any rechargeable secondary battery such as a nickel metal hydride battery or a nickel cadmium battery.
  • FIG. 9 to FIG. 10 show battery packs 30 and 40 made by the present inventors as prototypes.
  • the battery packs 30 and 40 can position the power receiving coils 31 and 41 using the attractive force of the positioning magnet 102 provided on the charging stand 100.
  • the magnetic sheet 37 is disposed between the secondary battery cell 12 and the power receiving coil 31, and the hollow portion of the power receiving coil 31 is used as an air-core-shaped gap 36.
  • the central axis of the power receiving coil 31 can be made to coincide with the central axes of the power transmitting coil 101 and the power receiving coil 31 by the attractive force of the positioning magnet 102.
  • the power transmission coil 101 and the power reception coil 31 can be electromagnetically coupled.
  • a part of the power receiving coil 31 is overlapped with the positioning magnet 102 arranged on the charging stand 100.
  • the positioning magnet 102 and the magnetic sheet 37 are integrated via the power receiving coil 31, the magnetic shield 37 is saturated and the magnetic permeability is lowered, and the magnetic flux from the power transmitting coil, the power receiving coil, and the positioning magnet 102 is magnetic.
  • the characteristic of the magnetic shield 37 is deteriorated and the function of shielding the outer can of the secondary battery cell 12 is impaired.
  • the L value of the inductance is reduced in a part of the power receiving coil 31. Loss. That is, the characteristics of the power receiving coil 31 are deteriorated.
  • the outer diameter D and inner diameter d ′ of the power receiving coil 31 and the outer diameter DM of the positioning magnet 102 are used.
  • the receiving coil 31 and the magnetic sheet 37 have an overlapping portion OL that overlaps the positioning magnet 102.
  • the thickness of the battery pack 30 is increased with respect to the tendency to reduce the thickness of battery-driven devices and the like, and there is a concern that the battery pack 30 may go backward.
  • Still another prototype battery pack 40 has a magnetic sheet 47 disposed between the secondary battery cell 12 and the power receiving coil 41 as shown in FIG.
  • the outer diameter D and inner diameter d of the power receiving coil 41 and the outer diameter DM of the positioning magnet 102 are used.
  • the power receiving coil 41 is provided with an air-core-shaped gap 46 in which the inner diameter d of the power receiving coil 41 is substantially equal to or larger than the outer diameter of the positioning magnet 102.
  • the magnetic material sheet 47 is widened in the magnetized state by the positioning magnet 102.
  • the battery pack 40 has a magnetic material sheet thickness t2 in which the magnetic sheet 47 is thinned because the attractive force to the positioning magnet 102 is increased by widening the range of the magnetized state.
  • the positioning magnet 102 of the charging stand 100 has an outer diameter DM of 15 mm, an overlapping portion OL that is an overlapping portion of about 5 mm is generated.
  • the thickness t3 of the magnetic material sheet 37 is required to be about 0.9 mm.
  • the outer diameter D of the circular power receiving coil 41 is 30 mm ⁇ , and the inner diameter d is 20 mm ⁇ .
  • the receiving coil 41 and the positioning magnet 102 can eliminate the overlapping portion OL which is an overlapping portion, and problems such as a decrease in the magnetic permeability of the magnetic material sheet 47 can be eliminated.
  • the power receiving coil 41 is formed into a flat circular coil, and has an outer diameter D and an inner diameter d.
  • the inner diameter d is substantially equal to or larger than the positioning magnet 102 of the charging stand 100.
  • the outer diameter is the same and the inner diameter is larger in FIG. The loss that occurs is improved.
  • the number of turns of the coil decreases, and the inductance decreases.
  • the receiving coil 11 having a rectangular shape is used for the outer shape of the receiving coil as shown in FIG. Therefore, in this embodiment, in order to efficiently perform electromagnetic coupling, it is preferable that the outer shape of the power receiving coil as shown in FIG.
  • the power receiving coil 11 has a length L on one side of the outer shape equal to the outer shape D of the power receiving coil 41, and a length l on one side of the inner shape equal to the inner diameter d of the power receiving coil 41.
  • the length l of one side of the inner shape of the power receiving coil 11 is about 1.27 times the area of the inner diameter d of the power receiving coil 41. Accordingly, the power receiving coil 11 shown in FIG.
  • the power receiving coil 11 can reduce the inductance reduction of the coil as the wire length increases as compared with the circular shape having the inner diameter d.
  • the wire used for the power receiving coil 11 is an insulated metal wire, a formal wire or an enamel wire in which the wire material skin is insulated with an insulating film.
  • a high-frequency current flows from a high-frequency power source, and a magnetic flux associated therewith is generated.
  • the power receiving coil 11 electromagnetically induces the magnetic flux to generate an induced electromotive force.
  • this high frequency for example, 20 kHz to 1 MHz is used.
  • the receiving coil 41 that receives high-frequency power can be more efficiently electromagnetically coupled to generate an induced electromotive force as the area receiving the magnetic flux is larger.
  • the rectangular power receiving coil 11 can widen the area for receiving the magnetic flux approximately 1.27 times that of the circular power receiving coil 41, so that a decrease in inductance can be suppressed, and the induced electromotive force can be reduced. It can be generated efficiently.
  • the length l of one side of the inner shape of the rectangular power receiving coil 11 is 20 mm, and the length L of one side of the outer shape is 30 mm.
  • the power receiving coil 11 and the positioning magnet 102 can be further separated from each other.
  • the thickness t1 of the magnetic material sheet 17 can be reduced to 0.52 mm.
  • the entire outer shape is a square shape, and the octagonal shape is chamfered at the corner, but the present invention is not limited to this example.
  • other rectangular shapes such as a rectangular shape and a hexagonal shape can be used.
  • the square coil has an advantage that the inductance can be increased because the coil wire is longer than the circular power receiving coil 41.
  • the thickness of the magnetic material sheet can be adjusted by adjusting the inner diameter or the inner shape of the power receiving coil.
  • the thing with the external shape chamfered as shown in FIG.5 (b) is also included in a "square-shaped coil.” (Void 16)
  • the power receiving coil 11 is provided with a magnetic sheet 17 between the secondary battery cells 12 and the hollow portion of the coil has an air core shape, which is used as a gap 16. Further, the magnetic sheet 17 of the power receiving coil 11 can receive the magnetic force of the positioning magnet 102 of the charging stand 100 directly in the absence of an obstacle by forming the space of the gap 16. As a result, the battery pack 11 placed on the charging stand 100 directly attracts the magnetic sheet 17 with the magnetic force of the positioning magnet 102 and aligns the central axis of the power receiving coil 11 with the central axis of the power transmitting coil 101. be able to.
  • the adjacent power transmission coil 101 and power reception coil 11 can be efficiently electromagnetically coupled and can generate an induced electromotive force.
  • the air gap 16 that is the air core of the power receiving coil 11 can be expanded more than the air gap 46 of the circular power receiving coil 41.
  • the positioning magnet 102 can further separate the power receiving coil 11, and the magnetic permeability of the magnetic sheet 17 due to the overlapping of the coil and the positioning magnet 102 is prevented from being lowered, and the influence on the outer can of the secondary battery cell 2 is prevented. Can be reduced. (Magnetic sheet 17)
  • the magnetic sheet used here is composed of a member having a low magnetic resistance, for example, a soft magnetic ferrite having a high magnetic permeability. Further, as the magnetic sheet, a sheet of ferrite can be used. In addition, a sheet in which a soft magnetic material powder or flake is applied and mixed in a resin can be used. Furthermore, it is preferable that the magnetic sheet suppresses the magnetic loss coefficient while increasing the magnetic permeability. Thus, the magnetic sheet can effectively prevent the outer can of the secondary battery pack 12 from being heated by eddy current loss due to electromagnetic induction.
  • the battery pack 10 having a thin magnetic sheet can make the battery pack itself thinner.
  • the magnetic sheet 17 in which the soft magnetic ferrite is formed into a sheet shape can efficiently use the magnetic force of the positioning magnet 102 of the charging stand 100 as an attractive force.
  • the resistance value of the receiving coil with the inner diameter d is lower than the inner diameter d ′, and the resistance loss of the receiving coil portion is reduced, and the charging efficiency is reduced. Is advantageous over the inner diameter d ′, but if the required charging efficiency and resistance equivalent to the inner diameter d ′ can be obtained, the wire diameter of the power receiving coil can be reduced.
  • the distance between the magnetic material sheet 17 and the positioning magnet 102 can be shortened, and the magnetic force of the positioning magnet 102 of the charging stand 100 can be efficiently used as the attractive force.
  • the battery pack or the battery driving device placed on the mounting surface of the charging stand 100 can correct the position by magnetic force.
  • the magnetic sheet can be a ferrite of a soft magnetic material that can convert the weight of the battery pack or the battery-driven device into a magnetic force that can move the weight of the battery pack or the battery driving device on the mounting surface of the charging stand 100. (Series capacitor 13)
  • the battery pack capable of contactless charging needs to match the inductance L value and the capacitance C value of the power receiving coil on the power receiving side and the series capacitor so as to be tuned to the resonance frequency from the transmitting coil of the charging stand.
  • the inner diameter of the power receiving coil is increased, in other words, when the air core diameter is increased, the number of turns of the power receiving coil is reduced and the inductance L value is relatively lowered.
  • the inductance L value decreases from 33 ⁇ H to 20 ⁇ H.
  • the LC series resonance frequency can be maintained by increasing the capacitance C value of the series capacitor 13 connected in series with the power receiving coil as shown in FIG.
  • the capacitance C value of the series capacitor is changed from 60 nF to 100 nF.
  • the resonance frequency of the battery pack can be tuned to the resonance frequency on the power transmission coil side.
  • the magnetic sheet 17 needs to be arranged in the thickness direction of the battery pack in order to cover the outer can of the secondary battery cell 12.
  • the arrangement position of the series capacitor is not limited to this, and can be arranged in the space in the battery pack. Therefore, the increase in the capacitance C value of the capacitor 13 has almost no effect on the thinning of the battery pack. Is obtained.
  • the battery pack 10 according to the embodiment can be used as a detachable battery pack as a power source of the battery driving device 50 such as a mobile phone or a portable music player.
  • FIG. 6 is a perspective view illustrating a state where the battery driving device 50 connected to the battery pack 10 of the embodiment is placed on the charging stand 100.
  • the battery pack 10 attached to the battery drive device 50 can be contactlessly charged by placing the battery drive device 50 on the charging stand 100.
  • the battery drive device 50 can be positioned by the magnetic force of the positioning magnet 102 by placing the battery drive device 50 at a rough position on the mark 106 indicating the placement position of the charging stand 100, for example. Can be electromagnetically coupled. Thereby, the user can easily place the battery-powered device 50 on the charging stand 100 and perform charging.
  • the battery pack 10 can be contactlessly charged alone, it can be prepared as a spare battery pack 10.
  • FIG. 7 is a perspective view showing a state in which a battery driving device incorporating a battery pack according to a modification is placed on a charging stand.
  • the battery drive device 60 in which the battery cannot be attached or detached can be charged by placing the battery pack 10 in the battery pack 10 and placing it on the contactless charging stand 100.
  • the battery-powered battery-powered device 60 is a battery built in the battery-powered device 60 by the magnetic force of the positioning magnet 102 by, for example, being placed at a rough position on the mark 106 indicating the mounting position of the charging stand 100.
  • the pack 10 can be positioned and electromagnetically coupled. Thereby, the user can easily place the battery-powered device 60 on the charging stand 100 and perform charging.
  • the battery pack 10 according to the present invention can be contactlessly charged by a conventional method by using such a magnetic sheet 17.
  • the magnetic material sheet 17 can be attracted by the magnetic force of the positioning magnet 102 of the charging stand 100. For this reason, this battery pack 10 can be positioned on the charging stand using another positioning magnet.
  • the battery drive devices 50 and 60 and the battery pack 10 can be charged even by using a charging stand 200 that allows the power transmission coil 201 to move in the XY directions.
  • the user can continue to use the same battery pack or battery-driven device even if the charging base is replaced with another standard.
  • the number of types of charging bases that can be used is increased, and an advantage of more convenient use can be obtained.
  • the secondary-side power receiving device and charging base and the secondary-side power receiving device according to the present invention can be suitably used as a battery pack and a charging base that can charge battery-operated devices such as mobile phones and portable music players in a contactless manner. .
  • secondary battery cell D outer diameter d (of power reception coil) ... (of power reception coil 41) ) Inner diameter d '... Inner diameter L (of receiving coil 31) ... Length of one side of outer shape (of receiving coil 11) ... Length of one side of inner shape (of receiving coil 11) DM ... outer diameter OL (of positioning magnet 102) ... overlapping portions t1, t2, t3 ... thickness of magnetic material sheet

Abstract

[Problem] Without thickening a magnetic body sheet, to enable charging and suppress loss even when placing on a charging stand that uses a positioning magnet. [Solution] A secondary-side power receiving apparatus is placed on a charging stand (100) provided with a positioning magnet and receives power from a power transmission coil (101) embedded in the charging stand (100). The secondary-side power receiving apparatus is provided with: a hollow power reception coil (11) that is capable of electromagnetic coupling with the power transmission coil (101) embedded in the charging stand (100); a rectification control circuit that rectifies and outputs the power received by the power reception coil (11); and a magnetic body sheet (17) that is disposed at the rear surface of the power reception coil (11). It is possible to position the hollow section of the power reception coil (11) and the positioning magnet (102) by means of magnetic force. As a result, the magnetic body sheet can be positioned by being attracted to the positioning magnet, and so there is no need to separately dispose a magnet, magnetic body, or the like.

Description

二次側受電機器及び充電台と二次側受電機器Secondary power receiving device and charging stand and secondary power receiving device
　本発明は、充電台に載せられた二次側受電機器の受電コイルと、充電台の送電コイルとを電磁結合し、送電コイルから受電コイルに磁気誘導作用で電力搬送して、内蔵電池を充電可能な二次側受電機器、及びこの二次側受電機器に送電する充電台と二次側受電機器の組み合わせに関する。 The present invention electromagnetically couples a power receiving coil of a secondary power receiving device mounted on a charging base and a power transmitting coil of the charging base, and carries power by magnetic induction from the power transmitting coil to the power receiving coil to charge a built-in battery. The present invention relates to a possible secondary side power receiving device, and a combination of a charging base and a secondary side power receiving device that transmits power to the secondary side power receiving device.
　携帯電話や携帯音楽プレーヤ等のモバイル機器に代表される電池駆動機器は、携帯に便利なように、充電できる電池により駆動されるものが多い。このような電池駆動機器は、電池を素電池の状態で、あるいは電池パックの状態で収納している。電池駆動機器は、電池を収納する状態で充電器に接点を接続して充電される。一方で、このように接点を接続することなく、電磁誘導の作用を利用して充電台に内蔵された送電コイルから、受電コイルに対して電力を搬送して、電池を充電する充電台が開発されている（特許文献１参照）。 Battery-driven devices represented by mobile devices such as mobile phones and portable music players are often driven by rechargeable batteries so that they are convenient to carry. Such a battery-driven device stores a battery in a unit cell state or a battery pack state. The battery-driven device is charged by connecting a contact to a charger in a state where the battery is accommodated. On the other hand, a charging stand that charges the battery by transporting power to the receiving coil from the power transmission coil built in the charging stand using the action of electromagnetic induction without connecting the contacts in this way has been developed. (See Patent Document 1).
　特許文献１に示す充電台は、図１１に示すように、充電台９１０に、交流電源で励磁される送電コイル９１１を内蔵し、この送電コイル９１１に電磁結合される受電コイル９２１を電池パック９３０に設けて、受電コイル９２１に誘導される電力で電池パック９３０の二次電池セル９３１を充電する。電池パック９３０は、受電コイル９２１に誘導される交流を整流し、これを二次電池セル９３１に供給して充電する充電回路を内蔵している。この電池パック９３０は、電力を供給のために電池駆動機器９２０に内蔵されている。これらの電池パック９３０や電池駆動機器９２０には、充電台９１０との位置決めのための凹部９２２を有している。さらに充電台９１０側には、この凹部９２２と対向する位置に、位置決めのための凸部９１２を有している。この構造によると、充電台９１０の上に電池駆動機器９２０を載せて、凹部９２２を凸部９１２に挿入させ、電気接続のための物理的な接点を接続することなく無接点な状態で二次電池セル９３１を充電できる。しかしながら、この電池駆動機器９２０や電池パック９３０には、凹部や凸部を必要とするために、外観的に見栄えが良くない構造となる。また、凸部が凹部に完全に挿入されない場合、電池駆動機器が充電台から浮き上がった状態となって、受電コイルと送電コイルの距離が離れて、電磁結合効率が悪くなるという問題もあった。 As shown in FIG. 11, the charging base shown in Patent Literature 1 includes a power transmission coil 911 that is excited by an AC power supply in a charging base 910, and a power receiving coil 921 that is electromagnetically coupled to the power transmission coil 911 is connected to a battery pack 930. The secondary battery cell 931 of the battery pack 930 is charged with electric power induced in the power receiving coil 921. The battery pack 930 has a built-in charging circuit that rectifies the alternating current induced by the power receiving coil 921 and supplies it to the secondary battery cell 931 for charging. The battery pack 930 is built in the battery driving device 920 for supplying power. The battery pack 930 and the battery driving device 920 have a recess 922 for positioning with the charging base 910. Further, on the charging base 910 side, a convex portion 912 for positioning is provided at a position facing the concave portion 922. According to this structure, the battery-driven device 920 is placed on the charging base 910, the concave portion 922 is inserted into the convex portion 912, and the secondary contact is made in a non-contact state without connecting a physical contact for electrical connection. The battery cell 931 can be charged. However, since the battery driving device 920 and the battery pack 930 require a concave portion and a convex portion, the structure is not good in appearance. In addition, when the convex portion is not completely inserted into the concave portion, there is a problem that the battery-driven device is lifted from the charging stand, the distance between the power receiving coil and the power transmitting coil is increased, and the electromagnetic coupling efficiency is deteriorated.
　このような無接点充電においては、充電台の送電コイルと、充電台に載置された電池駆動機器の受電コイルとを近接させること、言い換えるとこれらのコイル間の位置決めが重要となる。このような位置決めを実現するために、複数の方式が提案されており、例えば送電コイルを充電台の内部でＸＹ方向に移動させる方式、送電コイルを充電台に平面状に複数敷き詰めておき、この内で受電コイルと接近した送電コイルを選択させる方式、あるいはこのような送電コイルの位置を受電コイルの載置位置に合わせて調整する方式とは逆に、受電コイル側を送電コイルに合わせるため、例えば充電台に位置決め用の磁石を設けて、電池駆動機器側の金属板や磁性体シートや磁石と吸引させることで位置決めを行う方式などが開発されている。 In such contactless charging, it is important to bring the power transmission coil of the charging stand close to the power receiving coil of the battery drive device mounted on the charging stand, in other words, positioning between these coils. In order to realize such positioning, a plurality of methods have been proposed. For example, a method in which the power transmission coil is moved in the XY direction inside the charging base, a plurality of power transmission coils are laid flat on the charging base, In order to match the power receiving coil side with the power transmission coil, on the contrary, the method of selecting the power transmission coil close to the power receiving coil in the method or the method of adjusting the position of such power transmission coil according to the placement position of the power receiving coil, For example, a method has been developed in which a positioning magnet is provided on a charging stand, and positioning is performed by attracting the battery plate with a metal plate, a magnetic sheet, or a magnet on the battery drive device side.
　しかしながら、このような磁性体シートを配置した電池駆動機器に対して、上述した位置決め磁石を用いた位置決め方式で無接点充電を行う場合、図９に示すように、充電台１００に配置された位置決め磁石１０２と磁性体シールド３７が重なり、この重なり部分の磁性体シート３７が飽和し透磁率も低下し、送電コイル、受電コイル、位置決め磁石１０２からの磁束が磁性体シート３７を通過するため、磁性体シート３７の背面に配置した二次電池セル１２の外装缶を遮蔽する機能が損なわれる。さらに受電コイル３１の一部が磁性体シールド３７の磁束が通過する部分と重なり、磁性体シールド３７の背面に配置した二次電池セル１２の外装缶で渦電流損が発生する結果、受電コイル３１のインダクタンスＬ値が低下し、無接点充電が正常動作しなくなり、損失が大きくなるという問題がある。 However, in the case of performing contactless charging with the above-described positioning method using the positioning magnet for the battery-powered device in which such a magnetic sheet is disposed, the positioning disposed on the charging stand 100 as shown in FIG. Since the magnet 102 and the magnetic shield 37 are overlapped, the magnetic sheet 37 in this overlapping portion is saturated and the magnetic permeability is lowered, and the magnetic flux from the power transmission coil, the power receiving coil, and the positioning magnet 102 passes through the magnetic sheet 37, so that the magnetic The function of shielding the outer can of the secondary battery cell 12 disposed on the back surface of the body sheet 37 is impaired. Furthermore, a part of the power receiving coil 31 overlaps with a portion through which the magnetic flux of the magnetic shield 37 passes, and eddy current loss occurs in the outer can of the secondary battery cell 12 disposed on the back surface of the magnetic shield 37. There is a problem that the inductance L value decreases, the contactless charging does not operate normally, and the loss increases.
　このような問題を解決するには、磁性体シートの遮蔽効果を高め、部分的に磁性体シートが充電台の位置決め磁石と重なって配置されても、十分な遮蔽能力を発揮できるようにすることが考えられる。しかしながら、磁性体シートの遮蔽効果を高めるには、磁性体シートの厚さを厚くする必要があり、この場合は電池パックの厚さが厚くなり、電池パックの小型化を図れなくなるという問題があった。 In order to solve such problems, the shielding effect of the magnetic sheet is enhanced, and even if the magnetic sheet is partially overlapped with the positioning magnet of the charging stand, sufficient shielding ability can be exhibited. Can be considered. However, in order to enhance the shielding effect of the magnetic sheet, it is necessary to increase the thickness of the magnetic sheet. In this case, the thickness of the battery pack increases, which makes it impossible to reduce the size of the battery pack. It was.
特開２００８－１４１９４０号公報JP 2008-141940 A
　本発明は、従来のこのような問題点を解決するためになされたものである。本発明の主な目的は、磁性体シートの厚さを厚くすることなく、位置決め磁石を用いた充電台に載置しても、損失を抑制し、充電可能とした二次側受電機器及び受電台と二次側受電機器を提供することにある。 The present invention has been made to solve such conventional problems. The main object of the present invention is to provide a secondary side power receiving device and a power receiving device capable of suppressing loss and charging even when placed on a charging stand using a positioning magnet without increasing the thickness of the magnetic sheet. It is to provide a power stand and a secondary power receiving device.
課題を解決するための手段及び発明の効果Means for Solving the Problems and Effects of the Invention
　上記の目的を達成するため、本発明の第１の側面に係る二次側受電機器は、位置決め磁石を備える充電台に載置されて、充電台に内蔵される送電コイルから電力を受信可能な二次側受電機器であって、充電台１００に内蔵される送電コイル１０１と電磁結合可能な中空の受電コイル１１と、前記受電コイル１１で受けた電力を、整流して出力する整流制御回路と、前記受電コイル１１の背面に配置された磁性体シート１７と、を備え、前記受電コイル１１の中空部と、位置決め磁石１０２とを磁力により位置合わせ可能に構成できる。これにより、磁性体シートが、位置決め磁石に吸引されて位置決めできるので、別途、磁石、磁性体等を配置する必要がない。 In order to achieve the above object, the secondary power receiving device according to the first aspect of the present invention is placed on a charging stand including a positioning magnet and can receive power from a power transmission coil built in the charging stand. A secondary power receiving device, which is a hollow power receiving coil 11 that can be electromagnetically coupled to the power transmitting coil 101 built in the charging stand 100, and a rectification control circuit that rectifies and outputs the power received by the power receiving coil 11. The magnetic material sheet 17 disposed on the back surface of the power receiving coil 11 can be configured so that the hollow portion of the power receiving coil 11 and the positioning magnet 102 can be aligned by magnetic force. Thereby, since a magnetic material sheet is attracted | sucked and positioned by the positioning magnet, it is not necessary to arrange | position a magnet, a magnetic body, etc. separately.
　また第２の側面に係る二次側受電機器によれば、前記受電コイル１１の中空部の内径を、位置決め磁石１０２の外径ＤＭとほぼ等しく又はこれよりも大きくしてなる。これにより、電池パックを充電時に充電台に載置した際に、位置決め磁石と受電コイルとの重なりを回避して、位置決め磁石によって、電池駆動機器側に内蔵される磁性体シートおよび前記受電コイル１１の特性が低下する影響を緩和できる。この結果、電池パックの無接点充電方式を、位置決め磁石を用いて位置決めする方式と共用する場合でも、磁性体シートの厚さを薄く維持でき、電池パックの小型化が図られる。 Also, according to the secondary power receiving device according to the second side, the inner diameter of the hollow portion of the power receiving coil 11 is made substantially equal to or larger than the outer diameter DM of the positioning magnet 102. As a result, when the battery pack is placed on the charging base during charging, the positioning magnet and the power receiving coil are avoided from overlapping with each other, and the magnetic material sheet built in the battery driving device side by the positioning magnet and the power receiving coil 11. This can reduce the effect of lowering the characteristics. As a result, even when the contactless charging method of the battery pack is shared with the method of positioning using the positioning magnet, the thickness of the magnetic material sheet can be kept thin, and the battery pack can be downsized.
　さらにまた第３の側面に係る二次側受電機器によれば、前記受電コイル１１が、外形を角型状としてなる。これにより、角型状の受電コイルは、充電台の位置決め磁石に対し、円形状の受電コイルと同じ内径でも、より離すことができる。さらに、コイルの形状を変えることで磁性体シートを薄くできる。 Furthermore, according to the secondary power receiving device according to the third aspect, the power receiving coil 11 has a rectangular outer shape. Thus, the rectangular power receiving coil can be further separated from the positioning magnet of the charging stand even with the same inner diameter as the circular power receiving coil. Furthermore, the magnetic material sheet can be thinned by changing the shape of the coil.
　さらにまた第４の側面に係る二次側受電機器によれば、前記受電コイル１１の中空部が、空芯状である。これにより、受電コイルの中空部で磁性体シートを露出させ、位置決め磁石の磁力を直接受けて吸引力を高めることができる。 Furthermore, according to the secondary power receiving device according to the fourth aspect, the hollow portion of the power receiving coil 11 has an air-core shape. As a result, the magnetic sheet can be exposed in the hollow portion of the power receiving coil, and the magnetic force of the positioning magnet can be directly received to increase the attractive force.
　さらにまた第５の側面に係る二次側受電機器によれば、前記受電コイル１１を構成するワイヤに細線を用いることができる。これにより、必要とされる充電効率、抵抗値を得られるワイヤの線径を、従来よりも細くすることができる。またこの結果、、磁性体シートと位置決め磁石の距離が縮まるため、位置決め磁石の磁力を直接受けて吸引力を高めることができる。 Furthermore, according to the secondary side power receiving device according to the fifth aspect, a thin wire can be used for the wire constituting the power receiving coil 11. Thereby, the wire diameter of the wire which can obtain required charging efficiency and resistance value can be made thinner than before. As a result, since the distance between the magnetic sheet and the positioning magnet is reduced, the magnetic force of the positioning magnet can be directly received to increase the attractive force.
　さらにまた第６の側面に係る二次側受電機器によれば、前記磁性体シート１７を、位置決め磁石１０２の磁力により吸引力を発生させる軟磁性体のフェライトとしてなる。これにより、磁性体シートは、軟磁性体のフェライトとすることで、位置決め磁石の磁力を最大限に受けることができ、吸引力を増加させることができる。 Furthermore, according to the secondary side power receiving device according to the sixth aspect, the magnetic sheet 17 is made of a soft magnetic ferrite that generates an attractive force by the magnetic force of the positioning magnet 102. Thereby, a magnetic material sheet can receive the magnetic force of a positioning magnet to the maximum by making it a ferrite of a soft magnetic material, and can increase an attractive force.
　さらにまた第７の側面に係る二次側受電機器によれば、前記受電コイル１１と直列に接続されて共振回路を構成するための直列コンデンサ１３を有し、前記直列コンデンサ１３のキャパシタンスを、前記受電コイル１１と所定の共振周波数となる値に調整してなる。これにより、受電コイルの内径を従来よりも大きくして巻き数およびインダクタンスが低下する分を、直列コンデンサのキャパシタンスを増やし望ましい共振周波数に調整して、電力伝送を効率よくすることができる。 Furthermore, according to the secondary power receiving device according to the seventh aspect, the power receiving device has a series capacitor 13 connected in series with the power receiving coil 11 to form a resonance circuit, and the capacitance of the series capacitor 13 is The power receiving coil 11 is adjusted to a value that provides a predetermined resonance frequency. As a result, it is possible to increase the capacitance of the series capacitor and adjust the resonance frequency to a desirable resonance frequency by increasing the inner diameter of the power receiving coil as compared with the prior art and reducing the number of turns and the inductance, thereby efficiently transmitting power.
　さらにまた第８の側面に係る二次側受電機器によれば、前記整流制御回路からの出力にて、磁性体シート１７の背面に設置された二次電池セル１２を充電することができる。これにより、二次側受電機器と二次電池セルを一セットとした電池パックとすることができる。さらに、磁性体シートにより二次電池セルの加熱を防ぐことができる。 Furthermore, according to the secondary power receiving device according to the eighth aspect, the secondary battery cell 12 installed on the back surface of the magnetic sheet 17 can be charged by the output from the rectification control circuit. Thereby, it can be set as the battery pack which made the secondary side power receiving apparatus and the secondary battery cell one set. Furthermore, the secondary battery cell can be prevented from being heated by the magnetic sheet.
　さらにまた第９の側面に係る二次側受電機器によれば、さらに、充電可能な二次電池セル１２を備えており、前記二次側受電機器は、電池駆動機器に接続されて、該電池駆動機器を駆動する電力を前記二次電池セル１２から供給する一方、充電台１００に載置されて、充電台１００に内蔵される送電コイルから電力を受けて充電可能な電池パック１０とできる。 Furthermore, according to the secondary side power receiving device according to the ninth aspect, the battery pack further includes a rechargeable secondary battery cell 12, and the secondary side power receiving device is connected to a battery driving device, While supplying electric power for driving the driving device from the secondary battery cell 12, the battery pack 10 is mounted on the charging stand 100 and can be charged by receiving electric power from a power transmission coil built in the charging stand 100.
　さらにまた第１０の側面に係る充電台と二次側受電機器によれば、充電台１００と、前記充電台１００に載置されて、電力を受信可能な二次側受電機器あって、前記充電台１００は、位置決め磁石１０２と、送電コイル１０１と、を備えており、前記二次側受電機器は、前記送電コイル１０１と電磁結合可能な中空の受電コイル１１と、前記受電コイル１１で受けた電力を、整流して出力する整流制御回路と、前記受電コイル１１の背面に配置された磁性体シート１７と、を備え、前記受電コイル１１は、前記二次側受電機器を前記充電台１００に載置した状態で、前記受電コイル１１の中空部内に位置決め磁石を配置できるよう、前記受電コイル１１の中空部の内径を、位置決め磁石１０２の外径ＤＭとほぼ等しく又はこれよりも大きくしてなる。これにより、電池パックを充電時に充電台に載置した際に、位置決め磁石と受電コイルとの重なりを回避して、位置決め磁石によって磁性体シートおよび受電コイルの特性が低下する影響を緩和できる。 Furthermore, according to the charging stand and the secondary power receiving device according to the tenth aspect, there is a charging stand 100 and a secondary power receiving device that is placed on the charging stand 100 and can receive power, The base 100 includes a positioning magnet 102 and a power transmission coil 101, and the secondary power receiving device receives the hollow power reception coil 11 that can be electromagnetically coupled to the power transmission coil 101 and the power reception coil 11. A rectification control circuit that rectifies and outputs electric power, and a magnetic sheet 17 disposed on a back surface of the power receiving coil 11, and the power receiving coil 11 supplies the secondary power receiving device to the charging stand 100. The inner diameter of the hollow portion of the power receiving coil 11 is substantially equal to or larger than the outer diameter DM of the positioning magnet 102 so that the positioning magnet can be disposed in the hollow portion of the power receiving coil 11 in the mounted state. It becomes Te. Thereby, when the battery pack is placed on the charging stand during charging, it is possible to avoid the overlapping of the positioning magnet and the power receiving coil, and to mitigate the influence of the magnetic properties of the magnetic material sheet and the power receiving coil being lowered by the positioning magnet.
本発明の実施例に係る電池パックが充電台に設置された状態を示す斜視図である。It is a perspective view which shows the state in which the battery pack which concerns on the Example of this invention was installed in the charging stand. 図１に示す充電台と電池パックに係る垂直断面図である。It is a vertical sectional view concerning the charging stand and battery pack shown in FIG. 変形例に係るマークを表示した充電台を示す斜視図である。It is a perspective view which shows the charging stand which displayed the mark which concerns on a modification. 電池パックの回路に係る回路図である。It is a circuit diagram concerning the circuit of a battery pack. 図５（ａ）は円形状の受電コイル、図５（ｂ）は実施例１に係る角型状の受電コイルを、それぞれ示す平面図である。FIG. 5A is a plan view illustrating a circular power receiving coil, and FIG. 5B is a plan view illustrating a square power receiving coil according to the first embodiment. 図１の電池パックを接続した電池駆動機器を充電台に載置した状態を示す斜視図である。It is a perspective view which shows the state which mounted the battery drive apparatus which connected the battery pack of FIG. 1 on the charging stand. 変形例に係る電池パックを内蔵した電池駆動機器を充電台に載置した状態を示す斜視図である。It is a perspective view which shows the state which mounted the battery drive apparatus incorporating the battery pack which concerns on a modification on the charging stand. 従来の受電コイルをＸＹ方向に移動可能とした充電台へ実施例の電池パックを載置した斜視図である。It is the perspective view which mounted the battery pack of the Example on the charging stand which made the conventional receiving coil movable to XY direction. 本発明者らが試作した電池パックを充電台に載置した垂直断面図である。It is the vertical sectional view which mounted the battery pack made experimentally by the present inventors on the charging stand. 本発明の実施例に係る円形状受電コイルを備える電池パックを充電台に載置した垂直断面図である。It is the vertical sectional view which mounted the battery pack provided with the circular receiving coil concerning the example of the present invention on the charging stand. 従来の無接点充電にて電池駆動機器を充電台にセットした状態を示す垂直断面図である。It is vertical sectional drawing which shows the state which set the battery drive apparatus to the charging stand by the conventional non-contact charge. 本発明の他の実施例に係る二次側受電機器を電池駆動機器に接続し充電台に設置する状態を示す斜視図である。It is a perspective view which shows the state which connects the secondary side power receiving apparatus which concerns on the other Example of this invention to a battery drive apparatus, and is installed in a charging stand.
　以下、本発明の実施の形態を図面に基づいて説明する。ただし、以下に示す実施の形態は、本発明の技術思想を具体化するための二次側受電機器及び充電台と二次側受電機器を例示するものであって、本発明は二次側受電機器及び充電台と二次側受電機器を以下のものに特定しない。さらに、本明細書においては、特許請求の範囲を理解しやすいように、実施例に示される部材に対応する番号を、「特許請求の範囲」および「課題を解決するたの手段の欄」に示される部材に付記している。ただ、特許請求の範囲に示される部材を、実施の形態の部材に特定するものでは決してない。特に実施の形態に記載されている構成部材の寸法、材質、形状、その相対的配置等は、特定的な記載がない限りは、本発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。なお、各図面が示す部材の大きさや位置関係等は、説明を明確にするため誇張していることがある。さらに以下の説明において、同一の名称、符号については同一もしくは同質の部材を示しており、詳細説明を適宜省略する。さらに、本発明を構成する各要素は、複数の要素を同一の部材で構成して一の部材で複数の要素を兼用する態様としてもよいし、逆に一の部材の機能を複数の部材で分担して実現することもできる。また、一部の実施例、実施形態において説明された内容は、他の実施例、実施形態等に利用可能なものもある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a secondary side power receiving device, a charging stand and a secondary side power receiving device for embodying the technical idea of the present invention, and the present invention is a secondary side power receiving device. The equipment and charging stand and secondary power receiving equipment are not specified as follows. Further, in the present specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” columns. It is appended to the members shown. However, the members shown in the claims are not limited to the members in the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
　本発明の実施の形態に係る二次側受電機器は、無接点の一次側充電器と電磁結合できる二次側の受電機器である。この二次側受電機器は、受電コイルと整流制御回路を備えており、外部の負荷機器に電力を供給できる電力とすることができる。このような二次側受電機器としては、例えば二次電池セルを内蔵する電池パックが利用できる。電池パックとした二次側受電機器は、充電台から受信した電力を二次電池セルへ供給してこれを充電する。また二次側受電機器が電池パックを一体化したものに限らず、例えば負荷機器に直接電力を供給するアダプタとしてもよい。図１２に示す二次側受電機器の例では、充電台１００’に内蔵される送電コイルと電磁結合可能な受電コイルを内蔵した充電アダプタ１０’としている。二次側受電機器を充電アダプタ１０’とすることで、充電台１００’から無接点で送電される電力を、電池駆動機器５０’である携帯電話に対して供給し、携帯電話に内蔵される二次電池を充電したり、携帯電話を駆動することができる。この構成であれば、電池駆動機器５０’が無接点充電に対応していなくても、二次側受電機器である充電アダプタを介在させることで充電可能とでき、既存の機器を無接点充電対応とすることができる。 The secondary-side power receiving device according to the embodiment of the present invention is a secondary-side power receiving device that can be electromagnetically coupled to the contactless primary-side charger. This secondary-side power receiving device includes a power receiving coil and a rectification control circuit, and can be power that can supply power to an external load device. As such a secondary-side power receiving device, for example, a battery pack incorporating a secondary battery cell can be used. The secondary-side power receiving device that is a battery pack supplies the power received from the charging stand to the secondary battery cell and charges it. Further, the secondary power receiving device is not limited to the one in which the battery pack is integrated, and may be an adapter that directly supplies power to the load device, for example. In the example of the secondary-side power receiving device shown in FIG. 12, a charging adapter 10 ′ including a power receiving coil that can be electromagnetically coupled to a power transmitting coil built in the charging stand 100 ′ is used. By using the secondary power receiving device as the charging adapter 10 ′, the power transmitted from the charging stand 100 ′ without contact is supplied to the mobile phone that is the battery-driven device 50 ′ and is built in the mobile phone. A secondary battery can be charged and a mobile phone can be driven. With this configuration, even if the battery-powered device 50 ′ does not support contactless charging, charging can be performed by interposing a charging adapter that is a secondary power receiving device, and existing devices can be contactlessly charged. It can be.
　この二次側受電機器は、送電コイルから磁束を受ける受電コイルを備え、さらに受電コイルの背部に磁性体シートを備えている。この磁性体シートの背部には、受電コイルが受電した電力を整流する板金、プリント基板及び電子回路等を備えた整流制御回路を配置している。これにより、二次側受電機器は、誘導起電力を二次電力として利用することができ、さらに、磁性体シートにより磁束による整流制御回路の加熱等を防ぐことができる。 The secondary power receiving device includes a power receiving coil that receives magnetic flux from the power transmitting coil, and further includes a magnetic sheet on the back of the power receiving coil. On the back of the magnetic sheet, a rectification control circuit including a sheet metal, a printed board, an electronic circuit, and the like that rectifies the power received by the power receiving coil is disposed. Thereby, the secondary side power receiving apparatus can use the induced electromotive force as the secondary power, and can further prevent the rectification control circuit from being heated by the magnetic flux by the magnetic sheet.
　以下、二次側受電機器の例として、充電台に載置して無接点又はワイヤレスで充電可能な電池パックの例を、図１～図７に基づいて説明する。これらの図において、図１は実施例に係る充電台に載置された電池パックの斜視図、図２は図１に示す充電台と電池パックの垂直断面図、図３は変形例に係るマークを表示した充電台に係る斜視図、図４は電池パックの充電回路に係る回路図、図５（ａ）は円形状の受電コイルの平面図、図５（ｂ）は角型状の受電コイルの平面図、図６は図１の電池パックを接続した電池駆動機器を充電台に載置した状態を示す斜視図、図７は変形例に係る電池パックを内蔵した電池駆動機器を充電台に載置した状態を示す斜視図をそれぞれ示している。さらに、本発明者らが試作した電池パックの例を、図９から図１０に示し、対比して説明する。
（充電台１００） Hereinafter, as an example of the secondary power receiving device, an example of a battery pack that is placed on a charging stand and can be charged in a contactless manner or wirelessly will be described with reference to FIGS. In these drawings, FIG. 1 is a perspective view of the battery pack placed on the charging stand according to the embodiment, FIG. 2 is a vertical sectional view of the charging stand and the battery pack shown in FIG. 1, and FIG. FIG. 4 is a circuit diagram relating to a battery pack charging circuit, FIG. 5A is a plan view of a circular power receiving coil, and FIG. 5B is a rectangular power receiving coil. FIG. 6 is a perspective view showing a state in which the battery driving device to which the battery pack of FIG. 1 is connected is placed on the charging stand, and FIG. 7 is a drawing showing the battery driving device incorporating the battery pack according to the modification. The perspective view which shows the mounted state is shown, respectively. Furthermore, an example of a battery pack prototyped by the present inventors is shown in FIGS. 9 to 10 and will be described in comparison.
(Charging stand 100)
　図１は、充電台１００の上に載置された二次側受電機器としての電池パック１０を示している。この充電台１００は、無接点での充電を行う無接点充電台である。充電台１００には、電力の入力端子として電源入力コネクタ１０３を設けている。さらにこの電源入力コネクタ１０３への電力供給は、商用電源をＡＣ／ＤＣアダプタ（図示せず）により直流電力に変換し、ＤＣ出力コネクタ１０４を接続し供給している。 FIG. 1 shows a battery pack 10 as a secondary power receiving device placed on a charging stand 100. The charging stand 100 is a contactless charging stand that performs charging without contact. The charging stand 100 is provided with a power input connector 103 as an input terminal for power. Further, power is supplied to the power input connector 103 by converting commercial power into DC power using an AC / DC adapter (not shown) and connecting the DC output connector 104 for supply.
　さらに、この充電台１００は、その外形の上面をほぼ平坦面の載置面とした矩形状の充電台ケース１０５で構成されている。この充電台ケース１０５は、例えば磁束を阻害しない樹脂製等とすることができる。充電台１００には、図示はしないが、電源入力コネクタ１０３より供給された電力を高周波電力とする高周波発振回路を有している。 Furthermore, the charging stand 100 is composed of a rectangular charging stand case 105 whose upper surface of the outer shape is a substantially flat mounting surface. The charging stand case 105 can be made of, for example, a resin that does not disturb the magnetic flux. Although not shown, the charging stand 100 has a high-frequency oscillation circuit that uses the power supplied from the power input connector 103 as high-frequency power.
　この高周波電力は、図２の断面図に示す送電コイル１０１へ高周波発振された電力として供給される。この高周波発振された電力は、送電コイル１０１に通電されることにより、磁束を発生させ、近接して配置されている電池パック１０の受電コイル１１にて誘導起電力を発生させることができる。
（位置決め磁石１０２） This high frequency power is supplied as high frequency oscillated power to the power transmission coil 101 shown in the cross-sectional view of FIG. The high-frequency oscillated power is energized in the power transmission coil 101 to generate magnetic flux, and an induced electromotive force can be generated in the power receiving coil 11 of the battery pack 10 disposed in proximity.
(Positioning magnet 102)
　送電コイルは、図５の平面図に示すような、中心部分に中空部を形成した平面状コイルである。さらに、図２の断面図に示す充電台１００は、送電コイル１０１の中空部に、位置決め磁石１０２を配置している。この位置決め磁石１０２は、送電コイル１０１の中空部の大きさと略同等か少し小さい外径ＤＭとした円柱形の形状としている。例えばこの実施例の位置決め磁石１０２は、充電台ケース１０５の上面で対局する電池パック１０側の円面をＮ極又はＳ極としている。後述するように、図２においては、図５の（ｂ）のような受電コイルの外形を角型状の受電コイル１１を利用している。 The power transmission coil is a planar coil in which a hollow portion is formed at the center as shown in the plan view of FIG. Further, the charging stand 100 shown in the cross-sectional view of FIG. 2 has a positioning magnet 102 disposed in a hollow portion of the power transmission coil 101. The positioning magnet 102 has a cylindrical shape with an outer diameter DM that is approximately the same as or slightly smaller than the size of the hollow portion of the power transmission coil 101. For example, in the positioning magnet 102 of this embodiment, the circular surface on the battery pack 10 side facing the upper surface of the charging base case 105 is an N pole or an S pole. As will be described later, in FIG. 2, a power receiving coil 11 having a rectangular shape is used as the outer shape of the power receiving coil as shown in FIG.
　さらに、この位置決め磁石１０２は、磁力による吸引力を利用し、電池パック１０の受電コイル１１との位置決めを行っている。これにより、電池パック１０内の受電コイル１１は、充電台１００の送信コイル１０１と近接させることができ、送信コイル１０１より発生する磁束を効率よく誘導起電力に変換することができる。 Furthermore, the positioning magnet 102 performs positioning with the power receiving coil 11 of the battery pack 10 by using an attractive force due to magnetic force. Thereby, the power reception coil 11 in the battery pack 10 can be brought close to the transmission coil 101 of the charging stand 100, and the magnetic flux generated from the transmission coil 101 can be efficiently converted into an induced electromotive force.
　この位置決め磁石１０２を利用した充電台１００は、例えば図３に示すように充電台ケース１０５の上面に、所定の位置に電池パック又は電池駆動機器を載置し易いように、載置位置を示すマーク１０６を設けることが好ましい。ユーザーは、充電台のマーク１０６に従って、大まかな位置に電池パック又は電池駆動機器を載置することで、位置決め磁石１０２の磁力により、電池パック又は電池駆動機器が位置決めをでき、電磁結合できる。 The charging stand 100 using the positioning magnet 102 indicates the mounting position so that the battery pack or the battery driving device can be easily placed at a predetermined position on the upper surface of the charging stand case 105 as shown in FIG. A mark 106 is preferably provided. The user places the battery pack or the battery-driven device in a rough position according to the mark 106 on the charging stand, whereby the battery pack or the battery-driven device can be positioned and electromagnetically coupled by the magnetic force of the positioning magnet 102.
　さらにここで利用される位置決め磁石１０２は、強力な磁力を備えていることが好ましい。例えば、充電台１００の載置面に置かれる電池パック又は電池駆動機器が、磁力によってその位置を補正できる程度とすることが好ましい。言い換えれば、電池パック又は電池駆動機器の重量を、充電台１００の載置面上で移動できる程度の磁力とし、好ましくはネオジウム系の位置決め磁石１０２とする。
（電池パック） Furthermore, the positioning magnet 102 used here preferably has a strong magnetic force. For example, it is preferable that the battery pack or the battery driving device placed on the mounting surface of the charging stand 100 can correct the position by magnetic force. In other words, the weight of the battery pack or the battery driving device is set to a magnetic force that can move on the mounting surface of the charging stand 100, and preferably a neodymium positioning magnet 102.
(Battery pack)
　受電コイル１１は、図４に示す直列コンデンサ１３を直列に接続され、送電コイル１０１に同調し、共振周波数を最大付近とした誘導起電力を発生させることができる。この誘導起電力は、電池パック１０の複数の制御回路を有する整流制御回路としての同期整流制御回路１４を経由し、二次電池セル１２へ電力を出力、供給することができる。 The power receiving coil 11 is connected to the series capacitor 13 shown in FIG. 4 in series, and can be tuned to the power transmitting coil 101 to generate an induced electromotive force having a resonance frequency near the maximum. This induced electromotive force can output and supply power to the secondary battery cell 12 via the synchronous rectification control circuit 14 as a rectification control circuit having a plurality of control circuits of the battery pack 10.
　さらにこの同期整流制御回路１４は、図示はしないが、受電コイル１１及び直列コンデンサ１３からの高周波電力を、整流回路と平滑回路により直流電力に変換される。二次電池セル１２は、この変換された直流電力を同期整流制御回路１４内の充電回路（図示せず）により充電することができる。 Further, although not shown, the synchronous rectification control circuit 14 converts high frequency power from the power receiving coil 11 and the series capacitor 13 into DC power by a rectification circuit and a smoothing circuit. The secondary battery cell 12 can charge the converted DC power by a charging circuit (not shown) in the synchronous rectification control circuit 14.
　さらにまた、この同期整流制御回路１４は、二次電池セル１２の充電電圧、充放電電流及び電池温度を監視している。この監視情報により二次電池セル１２が所定の閾値を超えた場合は、二次電池セル１２への充電を停止することができ、電池パック１０の安全性を向上させることができる。 Furthermore, the synchronous rectification control circuit 14 monitors the charging voltage, charging / discharging current, and battery temperature of the secondary battery cell 12. When the secondary battery cell 12 exceeds a predetermined threshold by this monitoring information, the charging of the secondary battery cell 12 can be stopped and the safety of the battery pack 10 can be improved.
　この図２に示す実施例での電池パック１０は、受電コイル１１と二次電池セル１２とを絶縁している磁性体シート１７を有し、受電コイル１１の内形が中空状の空隙１６を有している。この実施例での電池パックは、外装をプラスチック等の樹脂製とすることができ、または受電コイル側が充電台との接合部分の面のみをプラスチックフィルムとすることもできる。
（二次電池セル１２） The battery pack 10 in the embodiment shown in FIG. 2 has a magnetic sheet 17 that insulates the power receiving coil 11 from the secondary battery cell 12, and the power receiving coil 11 has a hollow space 16 in which the inner shape is hollow. Have. In the battery pack in this embodiment, the exterior can be made of a resin such as plastic, or only the surface of the power receiving coil side where it joins the charging base can be a plastic film.
(Secondary battery cell 12)
　この電池パック１０に内蔵される二次電池セル１２は、幅よりも薄い角型の直方体で、各面を一体成型した外装缶で形成し、金属ケースとすることができる。たとえば、金属ケースは、アルミニウム等とすることができ、外因性の衝撃から保護することができ、さらに軽量化・放熱性にも優れた効果を得ることができる。このような二次電池セル１２は、部品として、電磁誘導の影響を受けるものである。 The secondary battery cell 12 built in the battery pack 10 is a rectangular parallelepiped that is thinner than the width, and can be formed as a metal case by forming an outer can in which each surface is integrally molded. For example, the metal case can be made of aluminum or the like, can be protected from exogenous impacts, and can have an excellent effect in terms of weight reduction and heat dissipation. Such a secondary battery cell 12 is affected by electromagnetic induction as a component.
　この実施例での二次電池セルは、体積エネルギー密度の大きいリチウムイオン二次電池又はリチウムポリマー電池を使用することで、全体を軽く、薄く、小さくして利便性を良く、さらに出力電力容量を大きくできるため、電池駆動機器等に利用できる特徴がある。ただこれに限るものではなく、二次電池セルは、ニッケル水素電池やニッケルカドミウム電池等の充電できる全ての二次電池とすることもできる。 The secondary battery cell in this example uses a lithium ion secondary battery or a lithium polymer battery with a large volumetric energy density, so that the whole is light, thin, small and convenient, and further has an output power capacity. Since it can be enlarged, it has a feature that can be used for battery-powered devices. However, the present invention is not limited to this, and the secondary battery cell can be any rechargeable secondary battery such as a nickel metal hydride battery or a nickel cadmium battery.
　図９から図１０に、本発明者らが試作した電池パック３０、４０を示す。この電池パック３０、４０は、充電台１００に設けた位置決め磁石１０２の吸引力を利用し、受電コイル３１、４１の位置決めができる。まず、図９の電池パック３０は、二次電池セル１２と受電コイル３１との間に、磁性体シート３７を配置し、受電コイル３１の中空部を空芯状の空隙３６としている。これにより磁性体シート３７は、充電台１００の位置決め磁石１０２により、吸引された状態となる。さらに、受電コイル３１の中心軸は、位置決め磁石１０２の吸引力により送電コイル１０１と受電コイル３１の中心軸と一致させることができる。これにより、送電コイル１０１と受電コイル３１は、電磁結合することができる。 FIG. 9 to FIG. 10 show battery packs 30 and 40 made by the present inventors as prototypes. The battery packs 30 and 40 can position the power receiving coils 31 and 41 using the attractive force of the positioning magnet 102 provided on the charging stand 100. First, in the battery pack 30 of FIG. 9, the magnetic sheet 37 is disposed between the secondary battery cell 12 and the power receiving coil 31, and the hollow portion of the power receiving coil 31 is used as an air-core-shaped gap 36. As a result, the magnetic sheet 37 is attracted by the positioning magnet 102 of the charging stand 100. Further, the central axis of the power receiving coil 31 can be made to coincide with the central axes of the power transmitting coil 101 and the power receiving coil 31 by the attractive force of the positioning magnet 102. Thereby, the power transmission coil 101 and the power reception coil 31 can be electromagnetically coupled.
　しかしながら、図９に示すように、受電コイル３１の一部が、充電台１００に配置された位置決め磁石１０２と重なる結果となる。このため、受電コイル３１を介して位置決め磁石１０２と磁性体シート３７とが一体化して磁性体シールド３７が飽和し透磁率が低下して、送電コイル、受電コイル、位置決め磁石１０２からの磁束が磁性体シート３７を通過するため、つまり、磁性体シールド３７の特性が低下し、二次電池セル１２の外装缶を遮蔽する機能が損なわれる結果、受電コイル３１の一部でインダクタンスのＬ値が低下し、損失を生じる。つまり、受電コイル３１の特性が低下する。この図では、受電コイル３１の外径Ｄと、内径ｄ’と、位置決め磁石１０２の外径ＤＭとしている。この図に示すように、受電コイル３１及び磁性体シート３７には、位置決め磁石１０２と重なった重置部ＯＬを生じてしまう。これを解決するためには、磁性体シート３７の厚みを増した磁性体シートの厚さｔ３とする必要性が生じる。これにより、電池駆動機器等の薄型化の傾向に対して、この電池パック３０の厚みが増す結果となり、逆行してしまう可能性が懸念される。 However, as shown in FIG. 9, a part of the power receiving coil 31 is overlapped with the positioning magnet 102 arranged on the charging stand 100. For this reason, the positioning magnet 102 and the magnetic sheet 37 are integrated via the power receiving coil 31, the magnetic shield 37 is saturated and the magnetic permeability is lowered, and the magnetic flux from the power transmitting coil, the power receiving coil, and the positioning magnet 102 is magnetic. In order to pass through the body sheet 37, that is, the characteristic of the magnetic shield 37 is deteriorated and the function of shielding the outer can of the secondary battery cell 12 is impaired. As a result, the L value of the inductance is reduced in a part of the power receiving coil 31. Loss. That is, the characteristics of the power receiving coil 31 are deteriorated. In this figure, the outer diameter D and inner diameter d ′ of the power receiving coil 31 and the outer diameter DM of the positioning magnet 102 are used. As shown in this figure, the receiving coil 31 and the magnetic sheet 37 have an overlapping portion OL that overlaps the positioning magnet 102. In order to solve this, it is necessary to increase the thickness of the magnetic sheet 37 to the thickness t3 of the magnetic sheet. As a result, the thickness of the battery pack 30 is increased with respect to the tendency to reduce the thickness of battery-driven devices and the like, and there is a concern that the battery pack 30 may go backward.
　さらに他の試作の電池パック４０は、図１０に示すように二次電池セル１２と受電コイル４１との間に、磁性体シート４７を配置している。この図では、受電コイル４１の外径Ｄと、内径ｄと、位置決め磁石１０２の外径ＤＭとしている。さらに、受電コイル４１は、受電コイル４１の内径ｄの寸歩が、位置決め磁石１０２の外径とほぼ等しく又はこれよりも大きく、空芯状の空隙４６を設けられている。このため磁性体シート４７は、位置決め磁石１０２により磁化状態となる範囲が広くなる。これにより、電池パック４０は、磁化状態の範囲を広くしたことにより、位置決め磁石１０２への吸引力が増すため、磁性体シート４７を薄くした磁性体シートの厚さｔ２とすることができる。この構成であれば、磁性体シートの特性を向上させずとも、十分な遮蔽効果を発揮できるため、高価な磁性体シートを利用することなく、安価に構成できる上、磁性体シートをより薄くすることができる。本発明者らの試作によれば、図９に示す電池パック３０の受電コイル３１は、内径ｄ’＝１０ｍｍφ、外径Ｄ＝３０ｍｍφの円形状のコイルを利用している。これに対し、充電台１００の位置決め磁石１０２は、外径ＤＭが１５ｍｍであったため、約５ｍｍの重なり部分である重置部ＯＬが発生した。これを抑制するために磁性体シート３７の厚さｔ３が約０．９ｍｍ必要であった。これに対して、図１０に示す電池パック４０は、円形状の受電コイル４１の外径Ｄを３０ｍｍφ、内径ｄを２０ｍｍφとした。これにより、受電コイル４１と位置決め磁石１０２とが、重なり部分である重置部ＯＬを無くすことができ、磁性体シート４７の透磁率の低下等の問題を無くすことがでる。このため、磁性体シート４７の厚さｔ２を０．６ｍｍ厚にまで薄型化することが可能となった。このように、受電コイルの空芯部分の内径である空隙４６を大きくすることで、磁性体シート４７の薄型化が可能となり、電池パックのより一層の薄型化が実現できる。 Still another prototype battery pack 40 has a magnetic sheet 47 disposed between the secondary battery cell 12 and the power receiving coil 41 as shown in FIG. In this figure, the outer diameter D and inner diameter d of the power receiving coil 41 and the outer diameter DM of the positioning magnet 102 are used. Further, the power receiving coil 41 is provided with an air-core-shaped gap 46 in which the inner diameter d of the power receiving coil 41 is substantially equal to or larger than the outer diameter of the positioning magnet 102. For this reason, the magnetic material sheet 47 is widened in the magnetized state by the positioning magnet 102. As a result, the battery pack 40 has a magnetic material sheet thickness t2 in which the magnetic sheet 47 is thinned because the attractive force to the positioning magnet 102 is increased by widening the range of the magnetized state. With this configuration, a sufficient shielding effect can be exhibited without improving the characteristics of the magnetic sheet, so that it can be configured at low cost without using an expensive magnetic sheet, and the magnetic sheet is made thinner. be able to. According to the prototype of the present inventors, the power receiving coil 31 of the battery pack 30 shown in FIG. 9 uses a circular coil having an inner diameter d ′ = 10 mmφ and an outer diameter D = 30 mmφ. On the other hand, since the positioning magnet 102 of the charging stand 100 has an outer diameter DM of 15 mm, an overlapping portion OL that is an overlapping portion of about 5 mm is generated. In order to suppress this, the thickness t3 of the magnetic material sheet 37 is required to be about 0.9 mm. On the other hand, in the battery pack 40 shown in FIG. 10, the outer diameter D of the circular power receiving coil 41 is 30 mmφ, and the inner diameter d is 20 mmφ. Thereby, the receiving coil 41 and the positioning magnet 102 can eliminate the overlapping portion OL which is an overlapping portion, and problems such as a decrease in the magnetic permeability of the magnetic material sheet 47 can be eliminated. For this reason, it has become possible to reduce the thickness t2 of the magnetic material sheet 47 to 0.6 mm. In this way, by increasing the gap 46 that is the inner diameter of the air core portion of the power receiving coil, the magnetic material sheet 47 can be thinned, and the battery pack can be further thinned.
　さらに、図５の（ａ）に示されるように受電コイル４１は、平面円形としたコイル形成をし、受電コイル４１の外径Ｄと内径ｄとしている。この受電コイル４１では、内径ｄが、充電台１００の位置決め磁石１０２とほぼ等しい又はこれよりも大きな径としている。上述の図９、図１０の比較においては、外径が同一で、図１０で内径が大きくなっていることより、内径が狭い場合に比べ線長が短くなる分抵抗が下がり、受電コイル４１で発生する損失は改善されている。一方で、コイルの巻き数が減少し、インダクタンスが低下することとなる。 Further, as shown in FIG. 5A, the power receiving coil 41 is formed into a flat circular coil, and has an outer diameter D and an inner diameter d. In the power receiving coil 41, the inner diameter d is substantially equal to or larger than the positioning magnet 102 of the charging stand 100. In the comparison between FIG. 9 and FIG. 10 described above, the outer diameter is the same and the inner diameter is larger in FIG. The loss that occurs is improved. On the other hand, the number of turns of the coil decreases, and the inductance decreases.
　図２においては、図５の（ｂ）のような受電コイルの外形を角型状の受電コイル１１を利用している。そこで、この実施例では、電磁結合を効率よく行うために、図５の（ｂ）のような受電コイルの外形を角型状の受電コイル１１とすることが好ましい。この受電コイル１１は、外形の一辺の長さＬが受電コイル４１の外形Ｄと等しく、更に内形の一辺の長さｌが受電コイル４１の内径ｄと等しくしている。受電コイル１１の内形の一辺の長さｌは、受電コイル４１の内径ｄの面積に対して、約１．２７倍の面積を有することになる。これにより、図２に示す受電コイル１１は、更に拡張した空芯部を形成することができ、充電台１００の位置決め磁石１０２から離間され、磁界の影響を減少させることができる。さらに受電コイル１１は、内径ｄの円形に比べ線長が増える分コイルのインダクタンス低下を低減することができる。 In FIG. 2, the receiving coil 11 having a rectangular shape is used for the outer shape of the receiving coil as shown in FIG. Therefore, in this embodiment, in order to efficiently perform electromagnetic coupling, it is preferable that the outer shape of the power receiving coil as shown in FIG. The power receiving coil 11 has a length L on one side of the outer shape equal to the outer shape D of the power receiving coil 41, and a length l on one side of the inner shape equal to the inner diameter d of the power receiving coil 41. The length l of one side of the inner shape of the power receiving coil 11 is about 1.27 times the area of the inner diameter d of the power receiving coil 41. Accordingly, the power receiving coil 11 shown in FIG. 2 can form a further expanded air core portion, is separated from the positioning magnet 102 of the charging base 100, and can reduce the influence of the magnetic field. Further, the power receiving coil 11 can reduce the inductance reduction of the coil as the wire length increases as compared with the circular shape having the inner diameter d.
　さらに、受電コイル１１に用いられる線材は、絶縁金属線とし線材表皮を絶縁皮膜で絶縁しているホルマル線やエナメル線としている。送電コイル１０１は、高周波電源により高周波電流が流れ、それに伴った磁束を発生させ、その磁束を受電コイル１１が電磁誘導することにより誘導起電力を生じることとなる。この高周波は、例えば２０ｋＨｚから１ＭＨｚが用いられる。このような、高周波電力を受ける受電コイル４１は、磁束を受ける面積が広ければ広いほど、効率よく電磁結合し誘導起電力を生じさせることができる。これにより、角型状の受電コイル１１は、円形状の受電コイル４１に対し、約１．２７倍の磁束を受ける面積を広くすることができるため、インダクタンスの低下を抑制でき、誘導起電力を効率よく生じさせることができる。 Further, the wire used for the power receiving coil 11 is an insulated metal wire, a formal wire or an enamel wire in which the wire material skin is insulated with an insulating film. In the power transmission coil 101, a high-frequency current flows from a high-frequency power source, and a magnetic flux associated therewith is generated. The power receiving coil 11 electromagnetically induces the magnetic flux to generate an induced electromotive force. As this high frequency, for example, 20 kHz to 1 MHz is used. The receiving coil 41 that receives high-frequency power can be more efficiently electromagnetically coupled to generate an induced electromotive force as the area receiving the magnetic flux is larger. As a result, the rectangular power receiving coil 11 can widen the area for receiving the magnetic flux approximately 1.27 times that of the circular power receiving coil 41, so that a decrease in inductance can be suppressed, and the induced electromotive force can be reduced. It can be generated efficiently.
　ここで、図２及び図５（ｂ）は、例えば四角形状の受電コイル１１の内形の一辺の長さｌを２０ｍｍ、外形の一辺の長さＬを３０ｍｍとしている。これによって、受電コイル１１と位置決め磁石１０２とを一層離間させることができる結果、磁性体シート１７の厚さｔ１は０．５２ｍｍまでに薄型化させることができた。なお図５（ｂ）の例では、全体の外形を正方形状としつつ、隅部を面取りした八角形状となっているが、この例に限定されるものでない。例えば長方形状や六角形状など、他の角型状とすることもできる。また、角型コイルの方が円形状の受電コイル４１よりもコイルの線材が長くなる分、インダクタンスを大きくできる利点も得られる。このように、受電コイルの内径又は内形を調整することによって、磁性体シートの厚さを調整できる。なお、本明細書においては、図５（ｂ）に示すように外形が面取りされた状態のものも、「角型状のコイル」に含める。
（空隙１６） Here, in FIGS. 2 and 5B, for example, the length l of one side of the inner shape of the rectangular power receiving coil 11 is 20 mm, and the length L of one side of the outer shape is 30 mm. As a result, the power receiving coil 11 and the positioning magnet 102 can be further separated from each other. As a result, the thickness t1 of the magnetic material sheet 17 can be reduced to 0.52 mm. In the example of FIG. 5B, the entire outer shape is a square shape, and the octagonal shape is chamfered at the corner, but the present invention is not limited to this example. For example, other rectangular shapes such as a rectangular shape and a hexagonal shape can be used. In addition, the square coil has an advantage that the inductance can be increased because the coil wire is longer than the circular power receiving coil 41. Thus, the thickness of the magnetic material sheet can be adjusted by adjusting the inner diameter or the inner shape of the power receiving coil. In addition, in this specification, the thing with the external shape chamfered as shown in FIG.5 (b) is also included in a "square-shaped coil."
(Void 16)
　さらに、受電コイル１１は、二次電池セル１２との間に磁性体シート１７を設置し、コイルの中空部が空芯状であり、これを間隙１６としている。さらに、受電コイル１１の磁性体シート１７は、充電台１００の位置決め磁石１０２の磁力を、間隙１６の空間形成により直接、障害物がない状態で受けることができる。これにより、充電台１００に載置された電池パック１１は、位置決め磁石１０２の磁力を直接的に磁性体シート１７を吸引し、送電コイル１０１の中心軸に、受電コイル１１の中心軸を一致させることができる。この近接した送電コイル１０１と受電コイル１１は、効率よく電磁結合することができ、誘導起電力を発生させることができる。 Further, the power receiving coil 11 is provided with a magnetic sheet 17 between the secondary battery cells 12 and the hollow portion of the coil has an air core shape, which is used as a gap 16. Further, the magnetic sheet 17 of the power receiving coil 11 can receive the magnetic force of the positioning magnet 102 of the charging stand 100 directly in the absence of an obstacle by forming the space of the gap 16. As a result, the battery pack 11 placed on the charging stand 100 directly attracts the magnetic sheet 17 with the magnetic force of the positioning magnet 102 and aligns the central axis of the power receiving coil 11 with the central axis of the power transmitting coil 101. be able to. The adjacent power transmission coil 101 and power reception coil 11 can be efficiently electromagnetically coupled and can generate an induced electromotive force.
　さらにまた、受電コイル１１の空芯部である空隙１６が、円形状の受電コイル４１の空隙４６よりも拡張することができる。このため、位置決め磁石１０２は、受電コイル１１を更に離間させることができ、コイルと位置決め磁石１０２の重なりによる磁性体シート１７の透磁率も低下を防ぎ、二次電池セル２の外装缶への影響を減少させることができる。
（磁性体シート１７） Furthermore, the air gap 16 that is the air core of the power receiving coil 11 can be expanded more than the air gap 46 of the circular power receiving coil 41. For this reason, the positioning magnet 102 can further separate the power receiving coil 11, and the magnetic permeability of the magnetic sheet 17 due to the overlapping of the coil and the positioning magnet 102 is prevented from being lowered, and the influence on the outer can of the secondary battery cell 2 is prevented. Can be reduced.
(Magnetic sheet 17)
　ここで使用される磁性体シートは、磁気抵抗が小さい部材、例えば透磁率の高い軟磁性体のフェライトで構成する。さらに磁性体シートは、フェライトをシート状としたものが利用できる。また、軟磁性材料の粉末や薄片を樹脂中に塗布、混入したシートを利用することもできる。さらにまた、磁性体シートは、透磁率を高くしつつ、磁気損失係数を抑えることが好ましい。これにより、電磁誘導による渦電流損で二次電池パック１２の外装缶が加熱される自体を磁性体シートによって効果的に阻止できる。 The magnetic sheet used here is composed of a member having a low magnetic resistance, for example, a soft magnetic ferrite having a high magnetic permeability. Further, as the magnetic sheet, a sheet of ferrite can be used. In addition, a sheet in which a soft magnetic material powder or flake is applied and mixed in a resin can be used. Furthermore, it is preferable that the magnetic sheet suppresses the magnetic loss coefficient while increasing the magnetic permeability. Thus, the magnetic sheet can effectively prevent the outer can of the secondary battery pack 12 from being heated by eddy current loss due to electromagnetic induction.
　さらに、磁性体シートを薄くした電池パック１０は、電池パック自体の薄型化を可能とすることができる。軟磁性体のフェライトをシート状とした磁性体シート１７は、充電台１００の位置決め磁石１０２の磁力を効率よく吸引力とすることができる。さらにまた、前述したように、外径が同一で、内径を大きくした内径ｄにおいては、内径ｄ’に比べて内径ｄの受電コイルの抵抗値は低くなり受電コイル部の抵抗損失が減り充電効率が内径ｄ’に比べ有利となっているが、内径ｄ’と同等の必要とされる充電効率・抵抗値を得られるた場合には、受電コイルの線径を細くすることが出来る。コイル線径を細くすることで磁性体シート１７と位置決め磁石１０２間の距離を縮めることができ、充電台１００の位置決め磁石１０２の磁力を効率よく吸引力とすることができる。例えば、充電台１００の載置面に置かれる電池パック又は電池駆動機器が、磁力によってその位置を補正できる程度とすることが好ましい。言い換えれば、磁性体シートは、電池パック又は電池駆動機器の重量を、充電台１００の載置面上で移動できる程度の磁力を吸引力に変換できる軟磁性体のフェライトすることができる。
（直列コンデンサ１３） Furthermore, the battery pack 10 having a thin magnetic sheet can make the battery pack itself thinner. The magnetic sheet 17 in which the soft magnetic ferrite is formed into a sheet shape can efficiently use the magnetic force of the positioning magnet 102 of the charging stand 100 as an attractive force. Furthermore, as described above, in the inner diameter d having the same outer diameter and the larger inner diameter, the resistance value of the receiving coil with the inner diameter d is lower than the inner diameter d ′, and the resistance loss of the receiving coil portion is reduced, and the charging efficiency is reduced. Is advantageous over the inner diameter d ′, but if the required charging efficiency and resistance equivalent to the inner diameter d ′ can be obtained, the wire diameter of the power receiving coil can be reduced. By reducing the coil wire diameter, the distance between the magnetic material sheet 17 and the positioning magnet 102 can be shortened, and the magnetic force of the positioning magnet 102 of the charging stand 100 can be efficiently used as the attractive force. For example, it is preferable that the battery pack or the battery driving device placed on the mounting surface of the charging stand 100 can correct the position by magnetic force. In other words, the magnetic sheet can be a ferrite of a soft magnetic material that can convert the weight of the battery pack or the battery-driven device into a magnetic force that can move the weight of the battery pack or the battery driving device on the mounting surface of the charging stand 100.
(Series capacitor 13)
　一方で、無接点充電可能な電池パックは、充電台の送信コイルからの共振周波数に、同調するよう受電側の受電コイルと直列コンデンサのインダクタンスＬ値とキャパシタンスＣ値を整合する必要性がある。受電コイルの内径を大きくすると、いいかえると空芯径を大きくすると、受電コイルの巻き数が少なくなってインダクタンスＬ値が相対的に低下する。例えば円形状の受電コイルの内径を、コイル線の長さが同じで、１５．５ｍｍφから１７．５ｍｍφに変化させると、インダクタンスＬ値は３３μＨから２０μＨに低下する。このため、図４に示すように受電コイルと直列に接続した直列コンデンサ１３のキャパシタンスＣ値を高めることで、ＬＣ直列共振周波数を維持できる。ここでは、直列コンデンサのキャパシタンスＣ値を６０ｎＦから１００ｎＦに変更している。これにより、電池パックの共振周波数は、送電コイル側の共振周波数に同調させることができる。磁性体シート１７は、図２に示すように、二次電池セル１２の外装缶を被覆するために、電池パックの厚さ方向に配置する必要がある。これに対し、直列コンデンサの配置位置は、このような制約がなく、電池パック内の空間内に配置できるので、コンデンサ１３のキャパシタンスＣ値の増加は電池パックの薄型化に殆ど影響を与えない利点が得られる。 On the other hand, the battery pack capable of contactless charging needs to match the inductance L value and the capacitance C value of the power receiving coil on the power receiving side and the series capacitor so as to be tuned to the resonance frequency from the transmitting coil of the charging stand. When the inner diameter of the power receiving coil is increased, in other words, when the air core diameter is increased, the number of turns of the power receiving coil is reduced and the inductance L value is relatively lowered. For example, when the inner diameter of the circular power receiving coil is changed from 15.5 mmφ to 17.5 mmφ with the same coil wire length, the inductance L value decreases from 33 μH to 20 μH. For this reason, the LC series resonance frequency can be maintained by increasing the capacitance C value of the series capacitor 13 connected in series with the power receiving coil as shown in FIG. Here, the capacitance C value of the series capacitor is changed from 60 nF to 100 nF. Thereby, the resonance frequency of the battery pack can be tuned to the resonance frequency on the power transmission coil side. As shown in FIG. 2, the magnetic sheet 17 needs to be arranged in the thickness direction of the battery pack in order to cover the outer can of the secondary battery cell 12. On the other hand, the arrangement position of the series capacitor is not limited to this, and can be arranged in the space in the battery pack. Therefore, the increase in the capacitance C value of the capacitor 13 has almost no effect on the thinning of the battery pack. Is obtained.
　実施例の電池パック１０は、携帯電話や携帯音楽プレーヤ等の電池駆動機器５０の動力源として、着脱可能な電池パックとして利用可能である。図６は、実施例の電池パック１０を接続した電池駆動機器５０を充電台１００に載置した状態を示す斜視図である。この電池駆動機器５０に装着された電池パック１０は、電池駆動機器５０を充電台１００に載置し、無接点充電が可能である。電池駆動機器５０は、例えば充電台１００の載置位置を示すマーク１０６に大まかな位置に載置することで、位置決め磁石１０２の磁力により、電池駆動機器５０内の電池パック１０が位置決めをでき、電磁結合できる。これにより、ユーザは容易に電池駆動機器５０を充電台１００に載置し充電を行うことができる。さらに、電池パック１０は、単体で無接点充電が可能なため、予備の電池パック１０として用意しておくことができる。 The battery pack 10 according to the embodiment can be used as a detachable battery pack as a power source of the battery driving device 50 such as a mobile phone or a portable music player. FIG. 6 is a perspective view illustrating a state where the battery driving device 50 connected to the battery pack 10 of the embodiment is placed on the charging stand 100. The battery pack 10 attached to the battery drive device 50 can be contactlessly charged by placing the battery drive device 50 on the charging stand 100. The battery drive device 50 can be positioned by the magnetic force of the positioning magnet 102 by placing the battery drive device 50 at a rough position on the mark 106 indicating the placement position of the charging stand 100, for example. Can be electromagnetically coupled. Thereby, the user can easily place the battery-powered device 50 on the charging stand 100 and perform charging. Furthermore, since the battery pack 10 can be contactlessly charged alone, it can be prepared as a spare battery pack 10.
　さらに、図７は、変形例に係る電池パックを内蔵した電池駆動機器を充電台に載置した状態を示す斜視図である。電池の着脱が不可能な電池駆動機器６０は、内部に電池パック１０を内蔵させておくことにより、無接点の充電台１００に載置することで充電することができる。この電池内蔵型の電池駆動機器６０は、例えば充電台１００の載置位置を示すマーク１０６に大まかな位置に載置することで、位置決め磁石１０２の磁力により、電池駆動機器６０に内蔵された電池パック１０が位置決めをでき、電磁結合できる。これにより、ユーザは容易に電池駆動機器６０を充電台１００に載置し充電を行うことができる。 Furthermore, FIG. 7 is a perspective view showing a state in which a battery driving device incorporating a battery pack according to a modification is placed on a charging stand. The battery drive device 60 in which the battery cannot be attached or detached can be charged by placing the battery pack 10 in the battery pack 10 and placing it on the contactless charging stand 100. The battery-powered battery-powered device 60 is a battery built in the battery-powered device 60 by the magnetic force of the positioning magnet 102 by, for example, being placed at a rough position on the mark 106 indicating the mounting position of the charging stand 100. The pack 10 can be positioned and electromagnetically coupled. Thereby, the user can easily place the battery-powered device 60 on the charging stand 100 and perform charging.
　さらにまた、本発明にかかる電池パック１０は、このような磁性体シート１７を用いることで、従来の方式による無接点充電も可能となる。上述した図２に示すように、磁性体シート１７を充電台１００の位置決め磁石１０２の磁力で吸引させることが可能である。このため、この電池パック１０は、他の位置決め磁石を用いた充電台への位置決めが可能である。 Furthermore, the battery pack 10 according to the present invention can be contactlessly charged by a conventional method by using such a magnetic sheet 17. As shown in FIG. 2 described above, the magnetic material sheet 17 can be attracted by the magnetic force of the positioning magnet 102 of the charging stand 100. For this reason, this battery pack 10 can be positioned on the charging stand using another positioning magnet.
　その一方で、図８に示すように、電池駆動機器５０、６０及び電池パック１０は、送電コイル２０１をＸＹ方向に移動可能とした充電台２００を用いても、充電できる。このように、電池パックを複数の充電規格に対応させることで、ユーザは、充電台を別の規格のものと交換しても、同じ電池パックや電池駆動機器を継続して使用できるようになる。また外出先等での充電に際しても、利用可能な充電台の種類が増え、より便利に使用できる利点が得られる。 On the other hand, as shown in FIG. 8, the battery drive devices 50 and 60 and the battery pack 10 can be charged even by using a charging stand 200 that allows the power transmission coil 201 to move in the XY directions. In this way, by making the battery pack compatible with a plurality of charging standards, the user can continue to use the same battery pack or battery-driven device even if the charging base is replaced with another standard. . In addition, when charging on the go or the like, the number of types of charging bases that can be used is increased, and an advantage of more convenient use can be obtained.
　本発明に係る二次側受電機器及び充電台と二次側受電機器は、携帯電話や携帯型音楽プレーヤ等の電池駆動機器を無接点で充電可能な電池パック及び充電台として、好適に利用できる。 The secondary-side power receiving device and charging base and the secondary-side power receiving device according to the present invention can be suitably used as a battery pack and a charging base that can charge battery-operated devices such as mobile phones and portable music players in a contactless manner. .
１０、３０、４０…電池パック
１０’…充電アダプタ
１１、３１、４１…受電コイル
１２…二次電池セル
１３…直列コンデンサ
１４…同期整流制御回路
１６、３６、４６…空隙
１７、３７、４７…磁性体シート
５０、５０’、６０…電池駆動機器
１００、１００’、２００…充電台
１０１、２０１…送電コイル
１０２…位置決め磁石
１０３…電源入力コネクタ
１０４…ＤＣ出力コネクタ
１０５…充電台ケース
１０６…マーク
９１０…充電台
９１１…送電コイル
９１２…凸部
９２０…電池駆動機器
９２１…受電コイル
９２２…凹部
９３０…電池パック
９３１…二次電池セル
Ｄ…（受電コイルの）外径
ｄ…（受電コイル４１の）内径
ｄ’…（受電コイル３１の）内径
Ｌ…（受電コイル１１の）外形の一辺の長さ
ｌ…（受電コイル１１の）内形の一辺の長さ
ＤＭ…（位置決め磁石１０２の）外径
ＯＬ…重置部
ｔ１、ｔ２、ｔ３…磁性体シートの厚さ DESCRIPTION OF SYMBOLS 10, 30, 40 ... Battery pack 10 '... Charge adapter 11, 31, 41 ... Receiving coil 12 ... Secondary battery cell 13 ... Series capacitor 14 ... Synchronous rectification control circuit 16, 36, 46 ... Gap 17, 37, 47 ... Magnetic material sheet 50, 50 ', 60 ... Battery drive device 100, 100', 200 ... Charging stand 101, 201 ... Power transmission coil 102 ... Positioning magnet 103 ... Power input connector 104 ... DC output connector 105 ... Charging stand case 106 ... mark 910 ... charging base 911 ... power transmission coil 912 ... convex part 920 ... battery drive device 921 ... power reception coil 922 ... concave part 930 ... battery pack 931 ... secondary battery cell D ... outer diameter d (of power reception coil) ... (of power reception coil 41) ) Inner diameter d '... Inner diameter L (of receiving coil 31) ... Length of one side of outer shape (of receiving coil 11) ... Length of one side of inner shape (of receiving coil 11) DM ... outer diameter OL (of positioning magnet 102) ... overlapping portions t1, t2, t3 ... thickness of magnetic material sheet

Claims (10)

  1. 　位置決め磁石を備える充電台に載置されて、充電台に内蔵される送電コイルから電力を受信可能な二次側受電機器であって、
    　充電台(100)に内蔵される送電コイル(101)と電磁結合可能な中空の受電コイル(11)と、
    　前記受電コイ・BR>・11)で受けた電力を、整流して出力する整流制御回路と、
    　前記受電コイル(11)の背面に配置された磁性体シート(17)と、
    を備え、
    　前記受電コイル(11)の中空部と、位置決め磁石(102)とを磁力により位置合わせ可能に構成してなることを特徴とする二次側受電機器。     A secondary-side power receiving device that is mounted on a charging stand having a positioning magnet and can receive power from a power transmission coil built in the charging stand,
    A hollow power receiving coil (11) electromagnetically coupled with a power transmitting coil (101) built in the charging stand (100);
    A rectification control circuit that rectifies and outputs the power received by the power receiving carp
    A magnetic sheet (17) disposed on the back surface of the power receiving coil (11);
    With
    A secondary-side power receiving device, characterized in that the hollow portion of the power receiving coil (11) and the positioning magnet (102) can be aligned by magnetic force.
  2. 　請求項１に記載の二次側受電機器であって、
    　前記受電コイル(11)の中空部の内径を、位置決め磁石(102)の外径(DM)とほぼ等しく又はこれよりも大きくしてなることを特徴とする二次側受電機器。     The secondary power receiving device according to claim 1,
    A secondary-side power receiving device, wherein an inner diameter of a hollow portion of the power receiving coil (11) is substantially equal to or larger than an outer diameter (DM) of a positioning magnet (102).
  3. 　請求項１または２に記載の二次側受電機器であって、
    　前記受電コイル(11)が、外形を角型状としてなることを特徴とする二次側受電機器。     The secondary power receiving device according to claim 1 or 2,
    The secondary power receiving device, wherein the power receiving coil (11) has a rectangular outer shape.
  4. 　請求項１から３のいずれか一に記載の二次側受電機器であって、
    　前記受電コイル(11)の中空部が、空芯状であることを特徴とする二次側受電機器。     The secondary power receiving device according to any one of claims 1 to 3,
    The secondary power receiving device, wherein the hollow portion of the power receiving coil (11) has an air core shape.
  5. 　請求項１から４のいずれか一に記載の二次側受電機器であって、
    　前記受電コイル(11)を構成するワイヤに細線を用いてなる
    ことを特徴とする二次側受電機器。     The secondary-side power receiving device according to any one of claims 1 to 4,
    A secondary-side power receiving device, characterized in that a thin wire is used as a wire constituting the power receiving coil (11).
  6. 　請求項１から５のいずれか一に記載の二次側受電機器であって、
    　前記磁性体シート(17)を、位置決め磁石(102)の磁力により吸引力を発生させる軟磁性体のフェライトとしてなることを特徴とする二次側受電機器。     The secondary-side power receiving device according to any one of claims 1 to 5,
    The secondary-side power receiving device, wherein the magnetic sheet (17) is made of a soft magnetic ferrite that generates an attractive force by the magnetic force of the positioning magnet (102).
  7. 　請求項１から６のいずれか一に記載の二次側受電機器であって、さらに、
    　前記受電コイル(11)と直列に接続されて共振回路を構成するための直列コンデンサ(13)を有し、
    　前記直列コンデンサ(13)のキャパシタンスを、前記受電コイル(11)と所定の共振周波数となる値に調整してなることを特徴とする二次側受電機器。     The secondary power receiving device according to any one of claims 1 to 6, further comprising:
    A series capacitor (13) for constituting a resonance circuit connected in series with the power receiving coil (11),
    A secondary-side power receiving device, wherein the capacitance of the series capacitor (13) is adjusted to a value that has a predetermined resonance frequency with the power receiving coil (11).
  8. 　請求項１から７のいずれか一に記載の二次側受電機器であって、
    　前記整流制御回路からの出力にて、磁性体シート(17)の背面に設置された二次電池セル(12)を充電することを特徴とする二次側受電機器。     The secondary power receiving device according to any one of claims 1 to 7,
    The secondary-side power receiving device, wherein the secondary battery cell (12) installed on the back surface of the magnetic material sheet (17) is charged by the output from the rectification control circuit.
  9. 　請求項１から８のいずれか一に記載の二次側受電機器であって、さらに、
    　充電可能な二次電池セル(12)を備えており、
    　前記二次側受電機器は、
    　　電池駆動機器に接続されて、該電池駆動機器を駆動する電力を前記二次電池セル(12)から供給する一方、
    　　充電台(100)に載置されて、充電台(100)に内蔵される送電コイルから電力を受けて充電可能な電池パック(10)であることを特徴とする二次側受電機器。     The secondary power receiving device according to any one of claims 1 to 8, further comprising:
    It has a rechargeable secondary battery cell (12),
    The secondary power receiving device is:
    While connected to a battery-driven device and supplying power for driving the battery-driven device from the secondary battery cell (12),
    A secondary-side power receiving device that is a battery pack (10) that is placed on the charging base (100) and can be charged by receiving power from a power transmission coil built in the charging base (100).
  10. 　充電台(100)と、
    　前記充電台(100)に載置されて、電力を受信可能な二次側受電機器あって、
    　前記充電台(100)は、
    　　位置決め磁石(102)と、
    　　送電コイル(101)と、
    を備えており、
    　前記二次側受電機器は、
    　　前記送電コイル(101)と電磁結合可能な中空の受電コイル(11)と、
    　　前記受電コイル(11)で受けた電力を、整流して出力する整流制御回路と、
    　　前記受電コイル(11)の背面に配置された磁性体シート(17)と、
    を備え、
    　前記受電コイル(11)は、前記二次側受電機器を前記充電台(100)に載置した状態で、前記受電コイル(11)の中空部内に位置決め磁石を配置できるよう、
    　前記受電コイル(11)の中空部の内径を、位置決め磁石(102)の外径(DM)とほぼ等しく又はこれよりも大きくしてなることを特徴とする充電台と二次側受電機器。     Charging stand (100),
    There is a secondary power receiving device mounted on the charging stand (100) and capable of receiving power,
    The charging stand (100)
    A positioning magnet (102);
    A power transmission coil (101),
    With
    The secondary power receiving device is:
    A hollow power receiving coil (11) electromagnetically coupled to the power transmitting coil (101),
    A rectification control circuit that rectifies and outputs the power received by the power receiving coil (11);
    A magnetic sheet (17) disposed on the back surface of the power receiving coil (11);
    With
    The power receiving coil (11) is a state where the secondary side power receiving device is placed on the charging stand (100) so that a positioning magnet can be disposed in the hollow portion of the power receiving coil (11).
    A charging stand and a secondary power receiving device, wherein an inner diameter of a hollow portion of the power receiving coil (11) is substantially equal to or larger than an outer diameter (DM) of a positioning magnet (102).
PCT/JP2012/067767 2011-07-20 2012-07-12 Secondary-side power receiving apparatus, and charging stand and secondary-side power receiving apparatus WO2013011907A1 (en)

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