Button type battery

Abstract

To provide a button type battery capable of improving power receiving efficiency.SOLUTION: A button type battery 1 is generally configured to include a negative electrode housing 2 which is a negative electrode, a positive electrode housing 3 including a bottom portion 30 and a side portion 31 which is a positive electrode and rises from the bottom portion 30, a charging body 4 which is disposed in an internal space 10 formed by the negative electrode housing 2 and the positive electrode housing 3, and an antenna unit 5 which is disposed on the outer surface 301 of the bottom portion 30 of the positive electrode housing 3 and receives a power transmission signal transmitted from a power transmission device 9 for contactless power supply to the charging body 4.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a button battery. [Background technology]

[0002] As a conventional technology, there is known a button battery that includes a metal case consisting of an assembly of a positive electrode can and a negative electrode can, a receiving coil that generates AC power by contactlessly receiving power supplied from a power supply device, a power conversion unit that converts the AC power generated by the receiving coil into DC power, and a storage unit that charges based on the DC power generated by the power conversion unit and creates a potential difference between the positive electrode can and the negative electrode can by discharging (see, for example, Patent Document 1).

[0003] In this button battery, the power receiving coil, the power conversion unit, and the power storage unit are housed inside a metal case, and therefore, an electrode unit that functions as an electrode and an electromagnetically transparent unit that is formed between the electrode units and is electromagnetically transparent are formed on the bottom surface of at least one of the positive and negative electrode cans. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-171010 A Summary of the Invention [Problem to be solved by the invention]

[0005] Conventional button batteries have a receiving coil inside a metal case, so even if an electromagnetically transparent portion is formed, the electrode portion prevents the battery from receiving power supplied from a power supply device, reducing the power receiving efficiency.

[0006] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a button battery capable of improving power receiving efficiency. [Means for solving the problem]

[0007] One aspect of the present invention provides a button battery comprising a first housing which is a negative electrode, a bottom, and a second housing which is a positive electrode and has a side rising from the bottom, a charging body disposed in an internal space formed by the first housing and the second housing, and an antenna section disposed on the outer surface of the bottom of the second housing for receiving a power transmission signal transmitted from a power transmission device for contactless power supply to the charging body. Effect of the Invention

[0008] According to the present invention, it is possible to improve the power receiving efficiency. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1(a) is an example of a cross-sectional view of a button battery, and FIG. 1(b) is a diagram showing an example of a holder for the button battery. [Diagram 2] FIG. 2 is an example of a block diagram of a button battery and a power transmitting device. [Diagram 3] FIG. 3(a) is a diagram showing an example of an antenna unit, FIG. 3(b) is an example of a cross-sectional view of the antenna unit taken along line II(b)-II(b) in FIG. 3(a) as viewed from the direction of the arrow, and FIG. 3(c) is a cross-sectional view showing an example of an antenna unit according to a modified example. [Figure 4] FIG. 4(a) is a diagram showing an example in which antennas are arranged radially, and FIG. 4(b) is a diagram showing an example in which the antennas have different patterns on the first surface and the second surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] (Summary of the embodiment) The button battery of the embodiment is generally configured to include a first housing which is a negative electrode, a bottom, and a second housing which is a positive electrode and has a side rising from the bottom, a charging body disposed in the internal space formed by the first housing and the second housing, and an antenna section which is disposed on the outer surface of the bottom of the second housing and receives a power transmission signal transmitted from a power transmission device for contactless power supply to the charging body.

[0011] In this button battery, the antenna section is disposed on the outer surface of the bottom of the second housing, so that the antenna area can be maximized and power receiving efficiency is improved compared to a case in which this configuration is not adopted.

[0012] [Embodiment Mode] (Overview of Button Cell Battery 1) FIG. 1(a) is an example of a cross-sectional view of a button battery according to an embodiment, and FIG. 1(b) is a diagram showing an example of a holder for the button battery. FIG. 2 is an example of a block diagram of a button battery and a power transmitting device according to an embodiment. FIG. 3(a) is a diagram showing an example of an antenna unit according to an embodiment, and FIG. 3(b) is an example of a cross-sectional view of the antenna unit when a cross-section cut along line II(b)-II(b) in FIG. 3(a) is viewed from the direction of the arrow. FIG. 1(a) is a cross-section cut through the center of a button battery. In each of the figures according to the embodiments described below, the ratio and shape between figures may differ from the actual ratio and shape. In addition, "A to B" indicating a numerical range is used to mean A or more and B or less.

[0013] The button battery 1 is configured to be charged without the user being aware of it by receiving a power transmission signal transmitted from a power transmission device 9, even when the button battery 1 is, for example, housed in a battery holder 8 of a remote controller that enables remote operation of an electronic device, attached to the electronic device to store settings, or housed in an electronic key for opening and closing a vehicle door.

[0014] 1(a), this button battery 1 is generally configured to include a negative electrode housing 2 as a first housing that is a negative electrode, a positive electrode housing 3 as a second housing that is a positive electrode and has a bottom 30 and a side portion 31 that rises from the bottom 30, a charging body 4 disposed in an internal space 10 formed by the negative electrode housing 2 and the positive electrode housing 3, and an antenna unit 5 disposed on an outer surface 301 of the bottom 30 of the positive electrode housing 3 and that receives a power transmission signal transmitted from a power transmission device 9 for contactless power supply to the charging body 4. The internal space 10 is a space surrounded by the negative electrode housing 2 and the positive electrode housing 3, as shown by the dotted line in FIG.

[0015] Moreover, the antenna section 5 of this embodiment has a base 50 having a first surface 51 and a second surface 52 which is the opposite surface to the first surface 51, and has a first antenna 53 on the first surface 51 and a second antenna 54 on the second surface 52.

[0016] 2, the button battery 1 is configured to charge the charging body 4 by contactless power supply using a power transmission signal transmitted from a power transmitting device 9. The power transmitting device 9 of the present embodiment transmits power using microwaves 91 as the power transmission signal, for example.

[0017] As shown in Fig. 2, the button battery 1 further includes a conversion unit 11 and a control unit 12. The conversion unit 11 converts the microwaves 91 received by the antenna unit 5 into a direct current. The control unit 12 is a microcomputer including, for example, a CPU (Central Processing Unit) that performs calculations and processing on acquired data according to a stored program, and a RAM (Random Access Memory) and a ROM (Read Only Memory) that are semiconductor memories. The control unit 12 controls charging.

[0018] As an example, the power transmitting device 9 is roughly configured to include a transmitting antenna section 90, a transmitting conversion section 92, a power supply section 93, and a transmitting control section 94, as shown in FIG.

[0019] The transmitting antenna unit 90 is used to transmit microwaves 91 to the button battery 1. The transmitting conversion unit 92 converts power from a power supply unit 93 into microwaves 91. The power supply unit 93 supplies power for conversion into microwaves 91. This power supply unit 93 may be configured to use power supplied from an external power supply, or may be configured as a storage battery.

[0020] The transmission side control unit 94 is, for example, a microcomputer including a CPU, a RAM, a ROM, etc. The transmission side control unit 94 is configured to control the transmission side conversion unit 92 and the power supply unit 93.

[0021] Here, as a variant example, when the button battery 1 is configured to transmit a beacon signal indicating its own position, the power transmission device 9 may be configured to adjust the phase of the microwaves 91 based on the beacon signal received from the button battery 1 and transmit the microwaves 91 toward the button battery 1.

[0022] As an example, the button battery 1 is housed in a battery holder 8, as shown in FIG. 1(b). The battery holder 8 is generally configured to include a bottom 80, a circular side portion 81, a claw portion 82, a positive electrode holding portion 83, a positive electrode terminal 84, and a negative electrode terminal 85. A lid 86 is attached to the battery holder 8. The antenna portion 5 faces the lid 86. The battery holder 8 is formed using a resin material except for the positive electrode terminal 84 and the negative electrode terminal 85. The button battery 1 is configured such that at least the lid 86 is transparent to microwaves 91.

[0023] The bottom 80 is the bottom part of a cylinder, and is surrounded by a circular side 81. This circular side 81 has a shape corresponding to the side 31 of the button battery 1. The tabs 82 are provided at two locations on the circular side 81 and hold the button battery 1.

[0024] The positive electrode holding portion 83 holds a positive electrode terminal 84. The negative electrode terminal 85 is a terminal that is electrically connected to the negative electrode casing 2 of the button battery 1, i.e., the negative electrode side. The positive electrode terminal 84 is a terminal that is in contact with and electrically connected to the side portion 31 of the positive electrode casing 3 of the button battery 1. The positive electrode terminal 84 and the negative electrode terminal 85 are formed, for example, using a material obtained by plating a conductive metal such as copper or iron with nickel.

[0025] (Configuration of negative electrode housing 2) The negative electrode housing 2 is formed, for example, using a material obtained by plating a conductive metal such as copper or iron with nickel. This negative electrode housing 2 functions as a negative electrode and contacts and conducts with the negative electrode terminal 85 of the battery holder 8. The button battery 1 of this embodiment is not a primary battery that uses, for example, silver oxide as the positive electrode material, zinc as the negative electrode material, and an alkaline solution as the electrolyte, so the negative electrode housing 2 and the positive electrode housing 3 can be formed of a conductive metal such as iron or copper.

[0026] (Configuration of positive electrode housing 3) The positive electrode housing 3 is, for example, formed using the same material as the negative electrode housing 2. The positive electrode housing 3 is configured so that at least the side portion 31 functions as a positive electrode, and is in contact with and conductive with the positive electrode terminal 84 of the battery holder 8.

[0027] The positive electrode housing 3 has a circular bottom 30. The bottom 30 has a substrate 6 disposed on an inner surface 300 side, and an antenna unit 5 disposed on an outer surface 301 side. The outer surface 301 is a flat surface. Therefore, the installation surface of the antenna unit 5 is also a flat surface.

[0028] The bottom portion 30 is provided with an insertion opening 302 into which the end portion 55 of the antenna portion 5 is inserted. In the insertion opening 302, a packing for preventing foreign matter from entering the internal space 10 is disposed.

[0029] A gasket 7 is disposed between the negative electrode casing 2 and the positive electrode casing 3. This gasket 7 insulates the negative electrode casing 2 and the positive electrode casing 3, and also prevents foreign matter from entering the internal space 10.

[0030] (Configuration of charging body 4) The charging unit 4 is, for example, a secondary battery such as a lithium ion battery, a nickel metal hydride battery, or a nickel cadmium battery. In the present embodiment, the charging unit 4 is, for example, a lithium ion battery, but is not limited thereto. The charging unit 4 is charged by microwaves 91 transmitted from a power transmitting device 9.

[0031] (Configuration of antenna unit 5) As an example, the first antennas 53 of this embodiment have linear shapes and are arranged in the same direction as shown in Fig. 3(a). The second antennas 54 have linear shapes and are arranged in the same direction as the first antennas 53 so as to intersect with them. That is, the first antennas 53 and the second antennas 54 are arranged in a mesh shape. The first antennas 53 and the second antennas 54 are configured as monopole antennas with different directivities.

[0032] The antenna section 5 is disposed on the outer surface 301 of the bottom section 30, which is a plane extending from the side section 31, which is a positive electrode. The antenna section 5 is also provided on a first surface 51 and a second surface 52 of the base body 50, as shown in Fig. 3(a) and Fig. 3(b). The base body 50 is formed in a film shape using a flexible resin material such as polyimide or polyethylene terephthalate, for example, but is not limited to this.

[0033] The first antenna 53 on the first surface 51 and the second antenna 54 on the second surface 52 are formed as thin films of a conductive metal such as copper, for example. The first antenna 53 and the second antenna 54 are formed by printing, for example.

[0034] The lengths of the first antenna 53 and the second antenna 54 are determined based on half the wavelength (λ / 2) of the wavelength (λ) of the microwave 91. Furthermore, the button battery 1 has a limit on the length of the antenna due to the shape of the bottom 30 of the positive electrode case 3. In other words, the length of the antenna is made shorter than the diameter of the circular bottom 30. The first antenna 53 and the second antenna 54 of this embodiment are made of the same material, width, height, and length.

[0035] The microwaves 91 used for power transmission have a frequency of, for example, 5.7 to 24 GHz. Therefore, the first antenna 53 and the second antenna 54 each have a length of, for example, approximately 6 to 27 mm, making them mountable even on the smallest button battery 1.

[0036] As shown in Figs. 1(a) and 3(b), the first antenna 53 is a conductor, and is therefore disposed via an insulator 56 so as not to be electrically connected to the bottom 30. The insulator 56 is, for example, a double-sided tape, an adhesive, or an insulating member having insulating properties. In the present embodiment, the insulator 56 is, for example, a double-sided tape. When the first surface 51 of the base 50 is covered with an insulating film as an insulating member, the antenna unit 5 is attached to the bottom 30 with an adhesive or double-sided tape.

[0037] The first antennas 53 are arranged so as to have the same number and spacing as the second antennas 54. In addition, the first antennas 53 are arranged to cross the second antennas 54 at an angle of 90°.

[0038] Modifications of the antenna unit 5 The following describes modified examples of the antenna unit 5. Fig. 3(c) is a cross-sectional view showing an example of an antenna unit according to a modified example. Fig. 4(a) is a diagram showing an example in which antennas according to a modified example are radially arranged, and Fig. 4(b) is a diagram showing an example in which the antenna according to the modified example has different patterns on the first and second surfaces.

[0039] 3(c), no antenna is arranged on the first surface 51 in contact with the bottom 30 of the positive electrode housing 3, and a second antenna 54 is arranged on the second surface 52. In this manner, the antenna unit 5 may be configured such that an antenna is arranged on either the first surface 51 or the second surface 52.

[0040] In FIG. 4(a), the antenna unit 5 has antennas arranged radially and with a plurality of directivities. Specifically, the first antenna 53 and the second antenna 54 are arranged radially from the center of the bottom 30. In this modification, the first antenna 53 and the second antenna 54 are arranged offset from each other, but they may be arranged to coincide with each other. Also, as shown in FIG. 3(b), for example, the first antenna 53 and the second antenna 54 may be arranged on the second surface 52 so as not to contact the bottom 30. Note that the first antenna 53 and the second antenna 54 are insulated from each other by sandwiching an insulator between the antennas at the central portion where they intersect.

[0041] In this antenna unit 5, the first antenna 53 and the second antenna 54 are rotated at a certain angle and arranged with different directivities, so that compared to the case where an antenna with a single directivity is provided, microwaves 91 arriving from various directions can be received, improving the power receiving efficiency.

[0042] In Fig. 4(b), the first antenna 53 and the second antenna 54 have different patterns. As an example, the first antenna 53 is an antenna having a radial pattern. Also, as an example, the second antenna 54 is an antenna having a linear pattern arranged at equal intervals. In this case, the types of microwaves 91 that can be received by the first antenna 53 and the second antenna 54 increase, and thus the power receiving efficiency is improved compared to the case where an antenna with a single pattern is arranged.

[0043] As another modification, the button battery 1 may have the antenna unit 5 disposed in the internal space 10. In this modification, the bottom 30 of the button battery 1 is formed from a resin material that transmits microwaves 91, and the side 31 is formed from a conductive metal. Therefore, in the button battery 1, the positive electrode terminal 84 of the battery holder 8 and the side 31 of the positive electrode housing 3 come into contact with each other and are conductive, and the microwaves 91 pass through the bottom 30 and are received by the antenna unit 5.

[0044] (Configuration of Board 6) The substrate 6 is, for example, a rigid substrate. The conversion unit 11 and the control unit 12 are arranged on the substrate 6. As shown in FIG. 1(a), the substrate 6 also has a connector 303 arranged thereon, and an end 55 of the antenna unit 5 attached thereto. The end 55 has wiring electrically connected to the first antenna 53 and the second antenna 54 located thereon. Therefore, the antenna unit 5 is electrically connected to the conversion unit 11 and the control unit 12 via the connector 303.

[0045] (Effects of the embodiment) The button battery 1 according to the present embodiment can improve the power receiving efficiency. Specifically, the button battery 1 has the antenna unit 5 disposed on the outer surface 301 of the bottom 30 of the positive electrode case 3, so that the antenna area can be maximized and the power receiving efficiency is improved compared to a case where this configuration is not adopted.

[0046] In the button battery 1, the antenna part 5 is arranged on the outer surface 301 of the bottom 30 of the positive electrode housing 3, which has the largest area compared to the others, so that it is possible to maximize the length of the antenna and receive microwaves 91 with long wavelengths compared to a case in which this configuration is not adopted.

[0047] In the button battery 1, the first antenna 53 and the second antenna 54 can be arranged on the first surface 51 and the second surface 52 of the base body 50, so that it is easier to insulate the first antenna 53 and the second antenna 54 and it is easier to arrange antennas having different directivities than when they are arranged on only one surface, thereby improving the power receiving efficiency. In addition, since the button battery 1 can arrange antennas with different patterns on the first surface 51 and the second surface 52, it becomes easier to receive microwaves 91 with different wavelengths and microwaves 91 arriving from various directions than when this configuration is not adopted.

[0048] The button battery 1 is charged by microwaves 91 while housed in a battery holder 8 of a remote controller that enables remote operation of an electronic device, which reduces the risk of inoperability due to dead batteries and the hassle of battery replacement compared to when a battery capable of non-contact power supply is not used.

[0049] The button battery 1 is placed at the bottom 30 of the positive electrode casing 3 where microwaves 91 are not blocked by the electrode, rather than at the negative electrode casing 2 which is on the negative electrode terminal 85 side of the battery holder 8, so that the power receiving efficiency is improved compared to when this configuration is not adopted.

[0050] Although some embodiments and modifications of the present invention have been described above, these embodiments and modifications are merely examples and do not limit the invention according to the claims. These novel embodiments and modifications can be implemented in various other forms, and various omissions, substitutions, modifications, etc. can be made without departing from the gist of the present invention. In addition, not all combinations of features described in these embodiments and modifications are necessarily essential to the means for solving the problems of the invention. Furthermore, these embodiments and modifications are included in the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0051] 1...Button battery, 2...Negative electrode housing, 3...Positive electrode housing, 4...Charger, 5...Antenna section, 6...Substrate, 7...Gasket, 8...Battery holder, 9...Power transmission device, 10...Internal space, 11...Conversion section, 12...Control section, 30...Bottom, 31...Side section, 50...Base, 51...First surface, 52...Second surface, 53...First antenna, 54...Second antenna, 55...End section, 56...Insulator, 80...Bottom, 81...Circular side section, 82...Claw section, 83...Positive electrode holding section, 84...Positive electrode terminal, 85...Negative electrode terminal, 86...Cover, 90...Transmitting side antenna section, 91...Microwave, 92...Transmitting side conversion section, 93...Power supply section, 94...Transmitting side control section, 300...Inner surface, 301...Outer surface, 302...Insertion opening, 303...Connector

Claims

1. A first housing which is a negative electrode; a second housing having a bottom and a positive electrode having a side portion rising from the bottom; a charging body disposed in an internal space defined by the first housing and the second housing; an antenna unit that is disposed on an outer surface of the bottom of the second housing and receives a power transmission signal transmitted from a power transmitting device for contactless power supply to the charging body; A button cell battery comprising:

2. The antenna unit has a plurality of antennas arranged radially.

2. The button battery according to claim 1.

3. the antenna portion has a base having a first surface and a second surface opposite to the first surface, a first antenna on a first surface and a second antenna on the second surface; 2. The button battery according to claim 1.

4. The first antennas have linear shapes and are aligned in the same direction, The second antenna has a linear shape and is arranged in the same direction as the first antenna so as to intersect with the first antenna. The button battery according to claim 3 .

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