JP2012130177A - Charging system, electric apparatus provided with power reception device, and charger provided with power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a structure which can efficiently cool a power reception device without causing the size increase of the power reception device in a charging unit which delivers and accepts power in a non-contact manner by using the power reception device having a power reception part and a battery and a power supply device having a power supply part.SOLUTION: A charging system (1) includes: a device (3)(power reception device) having a power reception coil (11) (power reception part) and a battery (12); and a charger (2) (power supply device) having a power supply coil (21) supplying power to the power reception coil (11) in a non-contact manner. A contact part (13a)(heat conductive part) is provided at a portion of the device (3) which contacts with the charger (2) for transmitting heat generated in the device (3) to the charger (2). The charger (2) has a contact part (23a) contacting with the contact part (13a) of the device (3) and a heat sink (24)(heat radiation part) for radiating heat of the contact part (23a) to the exterior.

Description

  The present invention relates to a charging system including a power receiving device having a power receiving unit and a battery, and a power feeding device having a power feeding unit that supplies electric power to the power receiving unit in a non-contact manner, an electric device including the power receiving device, and The present invention relates to a charger including the power supply device.

  2. Description of the Related Art Conventionally, a charging system including a power receiving device having a power receiving unit and a battery and a power feeding device having a power feeding unit that supplies power to the power receiving unit in a non-contact manner is known. As such a charging system, for example, as disclosed in Patent Document 1, electric power is supplied from a power transmission device (power feeding device) to an electronic device (power receiving device) in a non-contact manner, and a battery in the electronic device is charged. The structure to do is known.

  In Patent Document 1, the electronic device and the power transmission device each have a coil, and a current is passed through the coil on the electronic device side using a magnetic field generated when a current is passed through the coil of the power transmission device. The structure which charges a battery by what is called electromagnetic induction is disclosed.

  In such a configuration, the electronic device and the power transmission device generate heat inside and become high temperature. Therefore, in the configuration disclosed in Patent Document 1, a heat spreader is provided in the electronic device, while a heat sink is provided in the power transmission device so that heat inside the electronic device and the power transmission device is released to the outside.

JP 2003-272938

  By the way, as described above, if a heat spreader for heat dissipation is also provided on the power receiving device side, the size of the device increases accordingly. If it is a large device, there is no particular problem even if a heat spreader is provided. However, since a small device such as an IC tag or a hearing aid is required to be small and lightweight, a heat radiating part such as a heat spreader is provided. It ’s difficult.

  However, in the configuration in which power is transferred by electromagnetic induction using a coil as described above, the temperature inside the device rises due to the coil, and thus cooling means is required even for a small device.

  Therefore, in the present invention, in a charging unit that transfers power in a contactless manner using a power receiving device having a power receiving unit and a battery and a power feeding device having a power feeding unit, the power receiving device does not increase in size. An object of the present invention is to obtain a configuration capable of efficiently cooling the above.

  A charging unit according to an embodiment of the present invention includes a power receiving unit for receiving power, a power receiving device having a battery charged by the power received by the power receiving unit, and a power receiving unit of the power receiving device. A power supply device having a power supply unit that supplies power by contact, and the power receiving device has a heat conducting portion at a portion in contact with the power supply device so as to transmit heat generated in the power reception device to the power supply device. The power supply device is provided with a contact portion that is in contact with the heat conducting portion of the power receiving device, and is thermally connected to the contact portion, and heat dissipation for radiating the heat of the contact portion to the outside. (First configuration).

  With the above configuration, heat generated in the power receiving unit or the like in the power receiving device is transmitted to the contact portion of the power feeding device through the heat conducting unit of the power receiving device. The heat transmitted to the contact portion is radiated to the outside from the heat radiating portion of the power feeding device. As a result, since the heat in the power receiving device can be radiated to the outside via the power feeding device without providing heat radiating means in the power receiving device, the power receiving device can be prevented without increasing the size of the power receiving device. Temperature rise can be suppressed.

  In the first configuration, it is preferable that the power receiving unit is thermally connected to a heat conducting unit of the power receiving device, and the power feeding unit is thermally connected to a heat radiating unit of the power feeding device. (Second configuration).

  Thereby, the heat which generate | occur | produced in the power receiving part and the electric power feeding part can be efficiently transmitted to the heat conduction part of a power receiving apparatus, and the thermal radiation part of a power feeding apparatus, respectively. Therefore, the power receiving unit and the power feeding unit can be efficiently cooled.

  In the first or second configuration, the heat conducting unit of the power receiving device and the contact unit of the power feeding device are preferably made of a material having a thermal conductivity of 1.0 W / m · K or more (first 3 configuration). In general, the thermal conductivity of the thermal conductive resin is 1.0 W / m · K or more, and the material having such thermal conductivity constitutes the thermal conduction portion of the power receiving device and the contact portion of the power feeding device. Thus, heat can be efficiently transferred from the power receiving device to the power feeding device. Therefore, heat generated in the power receiving device can be efficiently radiated from the power feeding device to the outside.

  In any one of the first to third configurations, the heat conducting portion of the power receiving device and the contact portion of the power feeding device are respectively provided in a part of a casing of the power receiving device and the power feeding device. The heat conducting part and the contact part are preferably made of a material having a higher thermal conductivity than the other parts of the casing of the power receiving device and the power feeding device (fourth configuration).

  Thereby, since only the heat conduction part of the power receiving device and the contact part of the power feeding device are made of a material having high thermal conductivity, the other parts of the power receiving device and the power feeding device are made of inexpensive ordinary resin. Can do. Therefore, an increase in manufacturing cost of the entire charging system can be suppressed.

  In addition, since a part of the power receiving device and the power feeding device is made of a material having high thermal conductivity, heat can be efficiently radiated from the part, and heat can be prevented from being transmitted to other parts. Therefore, with the above configuration, heat can be prevented from being transmitted to components such as a battery in the power receiving device.

  In any one of the first to fourth configurations, it is preferable that the heat conduction portion of the power receiving device and the contact portion of the power feeding device each have an arithmetic average roughness of a contact surface of 1 μm or less ( Fifth configuration). By doing so, the contact area between the heat conducting portion of the power receiving device and the contact portion of the power feeding device can be increased, and the heat in the power receiving device can be efficiently transmitted to the power feeding device side. Thereby, the heat in the power receiving device can be efficiently radiated to the outside via the power feeding device.

  In any one of the first to fifth configurations, it is preferable that at least one of the heat conducting portion of the power receiving device and the contact portion of the power feeding device is made of a heat conductive elastomer (sixth). Configuration). By adopting such a configuration, at least one of the heat conducting portion of the power receiving device and the contact portion of the power feeding device made of elastomer easily deforms, so that the heat conducting portion and the contact portion are more closely attached. Can do. Therefore, the air layer formed between the heat conducting portion and the contact portion is reduced. Thus, when heat is conducted from the power receiving device side to the power feeding device side, it is difficult to be affected by the air layer, so that heat can be efficiently transmitted from the power receiving device to the power feeding device side.

  In any one of the first to sixth configurations, it is preferable that the power supply device includes a blower unit for sending air to the contact surface of the contact unit (seventh configuration). By carrying out like this, the contact surface of the contact part of an electric power feeder can be cooled. Thereby, the heat transmitted from the power receiving device to the contact portion of the power feeding device can be radiated to the outside more efficiently.

  In any one of the first to seventh configurations, it is preferable that the power feeding device has a suction portion for sucking the power receiving device on a contact surface of the contact portion (eighth configuration). Thereby, the heat conducting part of the power receiving apparatus can be more closely attached to the contact part of the power feeding apparatus. Therefore, the heat generated in the power receiving device can be more reliably transmitted to the heat radiating portion of the power feeding device via the heat conducting portion and the contact portion, and the heat of the power receiving device can be efficiently radiated to the outside.

  In any one of the first to eighth configurations, the power reception unit of the power reception device and the power supply unit of the power supply device are each configured by a coil so as to transmit and receive electric power by electromagnetic induction. Is preferable (9th structure).

  In this way, when the power receiving unit of the power receiving device and the power feeding unit of the power feeding device are each configured by a coil and power is transmitted and received by electromagnetic induction, heat is generated in the coil, so that the inside of the power receiving device and the power feeding device Temperature rises easily. In such a configuration, by applying the first to eighth configurations described above, heat generated in the power receiving unit in the power receiving device can be efficiently radiated from the heat radiating unit in the power feeding device to the outside. In addition, heat generated by the coil constituting the power feeding unit in the power feeding device can be radiated to the outside from the heat radiating unit in the power feeding device.

  An electrical apparatus according to an embodiment of the present invention includes the power receiving device according to any one of claims 1 to 9 (tenth configuration).

  The charger concerning one Embodiment of this invention is equipped with the electric power feeder as described in any one of Claim 1 to 9 (11th structure).

  According to the charging unit according to the embodiment of the present invention, the power receiving unit including the power receiving unit and the battery is provided with the heat conducting unit, and the power feeding unit including the power feeding unit that supplies power to the power receiving unit in a non-contact manner. In addition, a contact portion that is in contact with the heat conducting portion and a heat radiating portion that is thermally connected to the contact portion are provided. Accordingly, heat generated in the power receiving device can be efficiently radiated from the power feeding device to the outside while preventing an increase in size of the power receiving device.

FIG. 1 is a diagram illustrating a schematic configuration of a charging system according to the first embodiment. FIG. 2 is a diagram illustrating a schematic configuration of devices in the charging system according to the modification of the first embodiment. FIG. 3 is a diagram illustrating a schematic configuration of a charger in the charging system according to the second embodiment. FIG. 4 is a diagram illustrating a schematic configuration of the charging system according to the third embodiment. FIG. 5 is a top view showing a schematic configuration of the charger.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals and description thereof will not be repeated.

[Embodiment 1]
(overall structure)
FIG. 1 is a diagram showing a schematic configuration of a charging system 1 according to Embodiment 1 of the present invention. The charging system 1 includes a charger 2 (power feeding device) and a device 3 (a power receiving device, an electric device) including a charging unit 10 that charges the battery 4 with the power supplied by the charger 2. The device 3 is a small device having a battery inside, such as an IC tag or a hearing aid. In addition, in FIG. 1, while omitting description of the wiring etc. in the charger 2 and the apparatus 3, the internal structure is simplified and shown.

  The charging system 1 is configured to transmit and receive electric power in a contactless manner between the charger 2 and the charging unit 10 on the device 3 side. Specifically, the charger 2 has a power supply side coil 21 (power supply unit) connected to a power source (not shown) via an AC adapter 26, while the charging unit 10 is connected to the battery 4. It has the power receiving side coil 11 (power receiving part) which comprises a part of circuit. With this configuration, the charging system 1 is configured to supply power from the charger 2 to the charging unit 10 using electromagnetic induction. Here, non-contact power transmission / reception means power transmission / reception between two devices without a terminal.

  Specifically, the charger 2 includes a power supply side coil 21, a drive circuit 22 for controlling a current flowing through the power supply side coil 21, and a housing 23 in which the power supply side coil 21 and the drive circuit 22 are housed. It has. The housing 23 is mainly made of a resin material such as polycarbonate resin (PC). Further, as will be described later, a high thermal conductivity resin having a higher thermal conductivity than other portions is used for a part of the housing 23. The power supply side coil 21 is disposed in the housing 23 so as to be thermally connected to a portion made of the high thermal conductivity resin.

  A heat sink 24 (heat dissipating part) for dissipating heat generated in the charger 2 is provided in the housing 23 of the charger 2. As will be described later, the heat sink 24 is thermally connected to a portion of the casing 23 of the charger 2 that is made of a high thermal conductivity resin.

  The device 3 includes a power receiving coil 11, a control circuit 12 for controlling a current flowing from the power receiving coil 11 to the battery 4, and a housing 13 in which the power receiving coil 11 and the control circuit 12 are housed. I have. Similarly to the case 23 of the charger 2 described above, the case 13 is also made of, for example, a PC resin, and a part of the case 13 is made of a high thermal conductivity resin having a higher thermal conductivity than other parts. . In addition, as will be described in detail later, the casing 13 of the device 3 has a portion that contacts the casing 23 of the charger 2 made of the above-described high thermal conductivity resin. Moreover, the power receiving side coil 11 is arrange | positioned in the housing | casing 13 so that it may be thermally connected with respect to the part comprised with this high thermal conductivity resin.

  The battery 4 has a case formed in a columnar shape by combining two members having a bottomed cylindrical shape, for example, although not particularly illustrated. In this case, an electrode body in which a plurality of flat positive electrodes and negative electrodes are alternately stacked is housed.

In the positive electrode, positive electrode active material layers containing a positive electrode active material are provided on both surfaces of a positive electrode current collector made of a metal foil such as aluminum. Specifically, the positive electrode is formed by applying a positive electrode mixture containing a positive electrode active material, a conductive auxiliary agent, a binder, and the like, which is a lithium-containing oxide capable of inserting and extracting lithium ions, onto a positive electrode current collector made of aluminum foil or the like. And dried. As the lithium-containing oxide as the positive electrode active material, for example, a lithium composite oxide such as lithium cobalt oxide such as LiCoO ₂ , lithium manganese oxide such as LiMn ₂ O ₄ , lithium nickel oxide such as LiNiO ₂ is used. Is preferred. Note that only one type of material may be used as the positive electrode active material, or two or more types of materials may be used. Further, the positive electrode active material is not limited to those described above.

  In the negative electrode, negative electrode active material layers containing a negative electrode active material are provided on both surfaces of a negative electrode current collector made of a metal foil such as copper. Specifically, the negative electrode is formed by applying and drying a negative electrode mixture containing a negative electrode active material capable of occluding and releasing lithium ions, a conductive additive and a binder on a negative electrode current collector made of copper foil or the like. Is done. As the negative electrode active material, for example, it is preferable to use a carbon material (such as graphite, pyrolytic carbon, coke, or glassy carbon) that can occlude and release lithium ions. The negative electrode active material is not limited to those described above.

  Therefore, the battery 4 in the present embodiment is a so-called lithium ion battery that performs charge and discharge by moving electrons between the positive electrode and the negative electrode by lithium ions.

  Each positive electrode is electrically connected to one member constituting the case of the battery 4. On the other hand, each negative electrode is electrically connected to the other member constituting the case of the battery 4. Thereby, the electrode body inside the battery 4 is electrically connected to the case of the battery 4.

(Cooling structure)
Next, a cooling structure of the charging system 1 having the above configuration will be described with reference to FIG.

  In the charging system 1, contact portions 23 a and 13 a made of a high thermal conductivity material having higher thermal conductivity than other portions are formed on the casing 23 of the charger 2 and the casing 13 of the device 3, respectively. Yes. These contact portions 23a and 13a constitute part of the casings 23 and 13, respectively. In addition, the contact part 13a provided in the housing | casing 13 of the apparatus 3 respond | corresponds to the heat conductive part of this invention.

  As described above, the power supply side coil 21 of the charger 2 is disposed in the casing 23 so as to be thermally connected to the contact portion 23a of the casing 23. Further, the power receiving side coil 11 of the device 3 is disposed in the casing 13 so as to be thermally connected to the contact portion 13a of the casing 13. Thereby, the heat generated in the power supply side coil 21 of the charger 2 is transmitted to the contact portion 23a of the casing 23, and the heat generated in the power reception side coil 11 of the device 3 is transmitted to the contact portion 13a of the casing 13. .

  Here, in the above-described charging system 1, the device 3 is placed on the charger 2 such that the contact portion 13 a of the housing 13 contacts the contact portion 23 a of the housing 23 in the charger 2. Thereby, the power receiving side coil 11 of the device 3 is positioned above the power feeding side coil 21 of the charger 2, and power can be efficiently supplied from the charger 2 to the device 3 side. In addition, the heat generated in the device 3 can be efficiently transferred to the contact portion 23a of the housing 23 of the charger 2 via the contact portion 13a of the housing 13 of the device 3.

  The heat sink 24 disposed in the housing 23 of the charger 2 is thermally connected to the contact portion 23 a of the housing 23. Thereby, the heat of the contact portion 23a is radiated from the heat sink 24 to the outside. The heat generated in the power supply side coil 21 of the charger 2 is transmitted to the contact portion 23 a of the case 23 of the charger 2, and the heat generated in the power receiving side coil 11 of the device 3 is also transmitted to the case 13 of the device 3. It is transmitted through the contact part 13a. These heats are radiated to the outside through the heat sink 24 that is thermally connected to the contact portion 23 a of the housing 23.

The high thermal conductivity resin constituting the contact portion 23a of the housing 23 of the charger 2 and the contact portion 13a of the housing 13 of the device 3 is based on polyphenylene sulfide resin (PPS), silicon carbide (SiC), aluminum nitride ( AlN), boron nitride (BN), silicon nitride (SiN), beryllium oxide (BeO), magnesium oxide (MgO), aluminum oxide (Al ₂ O ₃ ), crystalline silicon dioxide (SiO ₂ ) or fusible dioxide A filler having a high thermal conductivity such as silicon (SiO ₂ ) is added. Since the PPS resin is used as a base, the flowability is high even when the filler as described above is added, so that the formed resin has a certain degree of strength while having excellent moldability.

  Here, the above-described high thermal conductivity resin has a thermal conductivity equal to or higher than the thermal conductivity (1.0 W / m · K) of a general thermal conductive resin in which an insulating filler is added to the base resin. Is preferred. More preferably, the high thermal conductivity resin has a thermal conductivity equal to or higher than that of glass (about 1.5 W / m · K). More preferably, the thermal conductivity is 10 W / m · K or more. As described above, a resin having a thermal conductivity of 10 W / m · K or higher is generally called an ultra-high thermal conductive resin and has a thermal conductivity equal to or higher than that of titanium (Ti). This ultra-high thermal conductive resin has a metal phase composed of a low-melting-point alloy made of an alloy such as Ag, Bi, Al, Mg, Zn, or Sn inside, and the metal phase constitutes a heat transfer path. ing. The thermal conductivity of the PC resin used for the casings 13 and 23 is about 0.2 W / m · K.

  Moreover, as for the contact part 23a of the housing | casing 23 of the charger 2, and the contact part 13a of the housing | casing 13 of the apparatus 3, the surface roughness of a contact surface is 1 micrometer or less by arithmetic mean roughness Ra, respectively. That is, the surface roughness of the contact surface is preferably set to the same level as the surface roughness of the sliding surface, not the surface roughness of the normal contact surface (surface roughness Ra greater than 1 μm). By making such a surface roughness, the contact area between the contact portion 23a of the charger 2 and the contact portion 13a of the device 3 can be increased, and heat can be efficiently transferred from the device 3 to the charger 2. Can do. Therefore, the heat generated in the device 3 can be efficiently radiated to the outside. The surface roughness of the contact surface is more preferably 0.4 μm or less in terms of Ra.

(Effect of Embodiment 1)
As described above, in this embodiment, the heat sink 24 as the heat radiating means is provided only on the charger 2 side, and the heat of the charger 2 and the device 3 is transmitted to the heat sink 24. Thereby, the heat generated in the device 3 can be radiated to the outside without providing the device 3 with a heat dissipating means. Therefore, an increase in temperature of the device 3 can be suppressed while suppressing an increase in size of the device 3.

  Moreover, since the contact portion 23a of the housing 23 of the charger 2 and the contact portion 13a of the housing 13 of the device 3 are made of high thermal conductivity resin, heat can be efficiently transferred by the contact portions 23a and 13a. It is possible to prevent heat from being transmitted to other parts. Therefore, in the case 23 of the charger 2 and the case 13 of the device 3, heat is transmitted to parts other than the portion constituted by the high thermal conductivity resin, and the components in the charger 2 and the device 3 become high temperature. Can be prevented.

(Modification of Embodiment 1)
FIG. 2 shows a modification of the first embodiment. In this modified example, not only the contact portion between the charger 2 and the device 3 but also the entire components constituting a part of each housing of the charger 2 and the device 3 are formed of a high thermal conductivity resin. In addition, although FIG. 2 shows the case where it applies to the housing | casing of the apparatus 3 as an example, it can apply similarly to the housing | casing of the charger 2. FIG.

  Specifically, the housing 16 includes an upper housing 14 that constitutes the upper half of FIG. 2 and a lower housing 15 that constitutes the lower half of FIG. That is, the casing 16 is configured by combining the upper casing 14 and the lower casing 15. And only the lower housing | casing 15 which contacts the housing | casing 23 of the charger 2 is comprised by the high thermal conductivity resin used in Embodiment 1. FIG.

  Thereby, the part which contacts the housing | casing 23 of the charger 2 by combining the upper housing | casing 14 comprised with normal resin (for example, PC resin) and the lower housing | casing 15 comprised with high thermal conductivity resin. It is possible to easily realize the casing 16 made of a high thermal conductivity resin.

[Embodiment 2]
FIG. 3 shows a schematic configuration of the charger 30 of the charging system according to the second embodiment. The charger 30 has the same configuration as that of the above-described first embodiment except that it includes a blower mechanism 35 that sends air to the contact surface with the device 3. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In addition, since the structure of the apparatus 3 is the same as the above-mentioned Embodiment 1, illustration and description are abbreviate | omitted.

  Specifically, the charger 30 has a blower mechanism 35 (blower part) for sending wind to the contact part 31a of the casing 31 with which the device 3 contacts. The blower mechanism 35 is configured by a blower such as a fan, for example. The blower mechanism 35 is disposed in the housing 31 of the charger 30. Therefore, the casing 31 of the charger 30 is provided with a blowout port 31b for sending the air discharged from the blower mechanism 35 to the contact portion 31a on the surface where the contact portion 31a is provided. Specifically, the air outlet 31b is provided so as to flow air toward the contact portion 31a side of the housing 31 through the through hole 31c provided in the housing 31 and the peripheral portion of the through hole 31c. It is comprised by the guide part 31d. In FIG. 3, the wind flow is indicated by arrows.

(Effect of Embodiment 2)
As described above, according to this embodiment, the charger 30 is provided with the air blowing mechanism 35 that sends the wind to the contact portion 31a of the casing 31 with which the device 3 contacts. Therefore, the contact portion 31a can be efficiently cooled. . Thereby, the heat generated in the device 3 and the charger 30 can be radiated not only from the heat sink 24 in the charger 30 but also from the contact portion 31a of the housing 31. Therefore, the device 3 and the charger 30 can be cooled more efficiently.

[Embodiment 3]
FIG. 4 shows a schematic configuration of the charger 40 of the charging system 50 according to the third embodiment. The charger 40 has the same configuration as that of the above-described first embodiment except that a suction mechanism 45 for sucking the device 3 to the contact portion 41a is provided. Therefore, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. In addition, since the structure of the apparatus 3 is the same as that of the above-mentioned Embodiment 1, description is abbreviate | omitted.

  Specifically, as shown in FIG. 4, a suction mechanism 45 (suction part) for sucking the device 3 to the contact part 41 a of the case 41 is provided in the case 41 of the charger 40. Yes. The suction mechanism 45 includes a suction unit 46 configured by, for example, a pump and a plurality of suction pipes 47 connected to the suction 46. Each suction pipe 47 is connected to a plurality of suction ports 41 b provided in the contact portion 41 a of the housing 41. As shown in FIG. 5, the suction port 41b is provided at the four corners of the rectangular contact portion 41a in plan view.

  In such a configuration, when the suction part 46 is driven, air inside the suction pipe 47 is sucked by the suction part 46, so that the suction part is provided from the plurality of suction ports 41 b provided in the contact part 41 a of the housing 41. Air is sucked toward 46. Thereby, since a suction force is generated around the suction port 41b, the device 3 positioned on the contact portion 41a of the housing 41 can be adsorbed to the contact portion 41a side (in the direction of the white arrow in FIG. 4). . Therefore, the contact portion 13a of the housing 13 of the device 3 and the contact portion 41a of the housing 41 of the charger 40 can be brought into close contact with each other.

  The suction unit 46 of the suction mechanism 45 is controlled so as to suck air only when the battery 4 in the device 3 is charged. Therefore, the suction part 46 stops the operation when the charging of the battery 4 of the device 3 is completed.

(Effect of Embodiment 3)
As described above, according to this embodiment, since the charger 40 is provided with the suction mechanism 45 for sucking the device 3 to the contact portion 41a of the housing 41, the contact portion 13a of the housing 13 of the device 3 is charged. The contact portion 41a of the housing 41 of the container 40 can be securely attached. Thereby, the heat generated in the device 3 is more reliably transferred to the heat sink 24 in the charger 40 via the contact portion 13a of the housing 13 of the device 3 and the contact portion 41a of the housing 41 of the charger 40. Can tell. Therefore, the heat in the device 3 can be radiated to the outside more efficiently by the heat sink 24 on the charger 40 side.

(Other embodiments)
While the embodiments of the present invention have been described above, the above-described embodiments are merely examples for carrying out the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the spirit of the invention.

  In each of the above embodiments, the configuration of the electromagnetic induction method has been described as the configuration for exchanging power without contact. However, any other configuration such as a radio wave method may be used as long as it can transmit and receive power without contact.

  In each said embodiment, the contact parts 23a, 31a, 41a of the chargers 2, 30, and 40 and the contact part 13a of the apparatus 3 are comprised by high thermal conductivity resin. However, the contact portions 13a, 23a, 31a, and 41a may be made of other materials such as metal as long as the material can efficiently transfer the heat of the device 3 to the chargers 2, 30, and 40 side.

  In each said embodiment, contact part 13a, 23a, 31a, 41a is comprised with high thermal conductivity resin. However, you may comprise the contact parts 13a, 23a, 31a, 41a with a heat conductive elastomer. In this case, when the device 3 is placed on the chargers 2, 30, and 40, the contact portions 13a, 23a, 31a, and 41a are deformed. Therefore, the device 3 and the chargers 2, 30, and 40 are more connected. It is possible to ensure close contact. Therefore, the air layer between the contact part 13a of the device 3 and the contact parts 13a, 23a, 31a, 41a of the chargers 2, 30, 40 can be reduced, and the influence of the air layer on heat conduction is reduced. be able to. Therefore, the heat of the device 3 can be efficiently transmitted to the chargers 2, 30 and 40 and efficiently radiated to the outside. Note that the above-described thermally conductive elastomer is a material in which a silicon rubber, an acrylic rubber, an ethylene propylene rubber, or the like is filled with a heat conductive substance such as aluminum oxide or boron nitride.

  In each of the above embodiments, the chargers 2, 30, 40 and a part of the casings 23, 31, 41, 13 of the device 3 are configured by the high thermal conductivity resin. However, you may comprise the housing | casing 23, 31, 41, 13 whole with high heat conductivity resin.

  In each of the above embodiments, the battery 4 is configured as a lithium ion battery. However, the battery 4 may be a battery other than a lithium ion battery as long as it is a rechargeable secondary battery. The shape of the battery is not limited to a coin shape, and may be any shape such as a columnar shape or a rectangular parallelepiped shape.

  In the second embodiment, a fan is used as the blower mechanism 35. However, the present invention is not limited to this, and any configuration can be used as long as it can send air to the contact portion 31a of the charger 30. Also good.

  In the third embodiment, the suction mechanism 45 is configured to suck air from the suction port 41 b provided in the contact part 41 a of the housing 41 by the suction part 46. However, for example, a material that can be easily adsorbed by the device 3 may be provided on the surface of the contact portion, or a material that adsorbs both may be disposed between the contact portion and the device 3.

  The charging unit according to the present invention can be used in a configuration including a power reception device having a battery and a power reception unit, and a power supply device having a power supply unit that supplies power to the power reception unit in a contactless manner.

1,50 charging system, 2,30,40 charger (power supply device), 3 device (electrical device), 4 battery, 10 charging unit (power receiving device), 11 power receiving side coil (power receiving unit), 13, 23, 31 , 41 housing, 13a contact part (heat conduction part), 21 power supply side coil (power supply part), 23a, 31a, 41a contact part, 24 heat sink (heat radiation part), 31b outlet, 35 blower mechanism (blower part), 45 Adsorption mechanism (adsorption part)

Claims (11)

A power receiving device for receiving power, and a power receiving device having a battery charged by the power received by the power receiving unit;
A power supply device having a power supply unit that supplies power to the power reception unit of the power reception device in a contactless manner, and
The power receiving device is provided with a heat conducting portion at a portion in contact with the power feeding device so as to transmit heat generated in the power receiving device to the power feeding device.
The power feeding device includes a contact portion that contacts the heat conducting portion of the power receiving device, and a heat radiating portion that is thermally connected to the contact portion and radiates heat of the contact portion to the outside. There is a charging system. The charging system according to claim 1,
The power receiving unit is thermally connected to a heat conducting unit of the power receiving device,
The charging system, wherein the power supply unit is thermally connected to a heat dissipation unit of the power supply device. The charging system according to claim 1 or 2,
The charging system, wherein the heat conducting unit of the power receiving device and the contact unit of the power feeding device are made of a material having a thermal conductivity of 1.0 W / m · K or more. The charging system according to any one of claims 1 to 3,
The heat conducting portion of the power receiving device and the contact portion of the power feeding device are respectively provided in a part of the casing of the power receiving device and the power feeding device,
The charging system, wherein the heat conducting unit and the contact unit are made of a material having a higher thermal conductivity than other parts of the power receiving device and the power feeding device. In the charging system according to any one of claims 1 to 4,
Each of the heat conducting unit of the power receiving device and the contact unit of the power feeding device is a charging system in which an arithmetic average roughness of a contact surface is 1 μm or less. The charging system according to any one of claims 1 to 5,
The charging system, wherein the heat conducting unit of the power receiving device and the contact unit of the power feeding device are made of a thermally conductive elastomer. The charging system according to any one of claims 1 to 6,
The power feeding device includes a blowing unit for sending air to a contact surface of the contact unit. The charging system according to any one of claims 1 to 7,
The power feeding device includes a suction unit for sucking the power receiving device on a contact surface of the contact unit. The charging system according to any one of claims 1 to 8,
The charging system, wherein the power reception unit of the power reception device and the power supply unit of the power supply device are each configured by a coil so as to exchange power by electromagnetic induction.   An electric device comprising the power receiving device according to claim 1.   The charger provided with the electric power feeder as described in any one of Claim 1 to 9.

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