JP6199156B2 - Battery unit and charging system - Google Patents

Description

  The present invention relates to a battery unit compatible with a primary battery used in an electronic device, and a charging system including the battery unit.

  2. Description of the Related Art Conventionally, there is known an electronic device that includes a rechargeable secondary battery and can charge the secondary battery in a contactless manner. For example, Patent Document 1 discloses an electronic device including a secondary battery and a power receiving coil. The secondary battery of this electronic device is charged by a charger having a feeding coil. Specifically, when an electronic device is inserted into the insertion portion of the charger and a voltage is applied to the power feeding coil, an induced current flows through the power receiving coil in the electronic device due to the influence of magnetic flux generated in the power feeding coil. When this current flows through the secondary battery, the secondary battery is charged.

JP 2008-206287 A

  By the way, about the electronic device in which the primary battery is used, it may be required to replace the primary battery with a secondary battery. However, in this case, the primary battery cannot be simply replaced with the secondary battery, and there is a problem that the electronic device needs to be changed, for example, by adding a charging circuit.

  Then, this invention makes it a subject to provide a battery unit which does not require a change of an electronic device, and a charging system provided with this, at the time of replacement | exchange with the primary battery used for the electronic device.

  The present invention is for solving the above-described problems, and is a battery unit that is compatible with a primary battery used in an electronic device, and receives a secondary battery and electric power supplied from the outside of the battery unit. A first circuit board that is electrically connected to the power receiving coil, the secondary battery and the power receiving coil, and charges the secondary battery using the power received by the power receiving coil, the secondary battery, the power receiving coil, and the first A case that accommodates the circuit board, a first circuit board that is electrically connected to the positive output terminal provided at a position corresponding to the positive electrode of the primary battery, and a first circuit board that is electrically connected to the primary battery. And a negative electrode output terminal provided at a position corresponding to the negative electrode of the battery.

  The battery unit according to the present invention includes not only a secondary battery but also a power receiving coil and a first circuit board necessary for charging the secondary battery. For this reason, when replacing the primary battery of an electronic device with a battery unit, it is not necessary to add a structure required for charging a secondary battery to the electronic device. Further, the positive electrode output terminal and the negative electrode output terminal of the battery unit are provided at positions corresponding to the positive electrode and the negative electrode of the primary battery to be replaced, respectively. Accordingly, the primary battery of the electronic device can be replaced with the battery unit without changing the positions of the positive electrode input terminal and the negative electrode input terminal of the electronic device. Thus, the battery unit according to the present invention can be replaced with a primary battery of an electronic device without changing the electronic device.

  In the battery unit, the first circuit board, the secondary battery, and the power receiving coil may be stacked in this order along the central axis direction of the case. According to this configuration, the first circuit board and the power receiving coil are disposed at the end of the stacked body of the first circuit board, the secondary battery, and the power receiving coil. For this reason, it is possible to easily connect the first circuit board to the positive electrode output terminal and the negative electrode output terminal, and it is also possible to easily perform power reception by the power receiving coil.

  At least one of the positive electrode output terminal and the negative electrode output terminal is preferably provided at a position that does not overlap the power receiving coil when viewed from the stacking direction of the first circuit board, the secondary battery, and the power receiving coil. According to this configuration, interference between the magnetic flux generated in the power receiving coil and the output terminal can be reduced.

  At least one of the positive electrode output terminal and the negative electrode output terminal includes an upper portion provided along the upper surface of the laminate of the first circuit board, the secondary battery, and the power receiving coil, and a bottom portion provided along the bottom surface of the laminate, A connecting portion that is provided along the side surface of the stacked body and connects the upper portion and the bottom portion may be included. According to this configuration, since the output terminal is provided along the surface of the laminate, the entire battery unit can be made compact.

  In the direction perpendicular to the stacking direction of the first circuit board, the secondary battery, and the power receiving coil, the size of the power receiving coil can be made smaller than the size of the secondary battery. According to this configuration, interference between the magnetic flux generated in the power receiving coil and the positive output terminal or the negative output terminal can be more reliably reduced.

  In the battery unit, at least one of the positive electrode output terminal and the negative electrode output terminal may be a metal foil provided on the surface of the first circuit board. Thus, by reducing the thickness of the output terminal, the battery unit as a whole can be made compact.

  The battery unit may further include a voltage regulator that converts a voltage output from the secondary battery and outputs a voltage having a magnitude equivalent to the voltage output from the primary battery. According to this configuration, even when the output voltage of the primary battery is different from the output voltage of the secondary battery of the battery unit, the primary battery can be replaced with the battery unit.

  In the battery unit, the case preferably has an outer diameter and dimensions equivalent to those of the primary battery. According to this configuration, it is not necessary to use a spacer or the like when arranging the secondary battery in the primary battery housing portion of the electronic device, and the primary battery can be replaced with the battery unit more easily.

  The charging system according to the present invention includes a battery unit configured as described above, a power supply coil that supplies power to the power receiving coil, and a second circuit that is electrically connected to the power supply coil and supplies power to the power supply coil. A substrate.

  In the above charging system, when the power feeding coil is disposed so as to face the power receiving coil of the battery unit and power is supplied from the second circuit board to the power feeding coil, magnetic flux is generated in the power feeding coil, and an induced current flows in the power receiving coil. By flowing this induced current through the secondary battery, the secondary battery can be charged in a non-contact manner.

It is a perspective view of the battery unit which concerns on 1st Embodiment of this invention. It is a front view of the battery unit of FIG. It is a top view of the battery unit of FIG. It is a bottom view of the battery unit of FIG. FIG. 2 is a vertical sectional view schematically showing the battery unit of FIG. 1 in an exploded state. It is a vertical sectional view showing an outline of the battery unit of FIG. 1 in an assembled state. FIG. 2 is a vertical cross-sectional view showing an outline of the battery unit in FIG. It is a vertical sectional view showing the outline of the charging device according to the first embodiment. It is a front view of the battery unit which concerns on 2nd Embodiment of this invention. FIG. 10 is a plan view of the battery unit of FIG. 9.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, about the same and an equivalent structure, the same code | symbol is attached | subjected and the same description is not repeated. For convenience of explanation, in each figure, a direction indicated by an arrow U is referred to as an upward direction, and a direction indicated by an arrow D is referred to as a downward direction.

<First Embodiment>
[Configuration of battery unit]
As shown in FIGS. 1 to 4, the battery unit 10 according to the first embodiment includes a secondary battery 1, a power receiving coil 2, a circuit board 3, a positive output terminal 41, a negative output terminal 51, and a transparent The case 6 is provided. The battery unit 10 can be replaced with a primary battery used in an electronic device.

(Secondary battery)
As shown in FIGS. 1 and 2, in the first embodiment, the secondary battery 1 is a coin-type lithium ion secondary battery, and is fitted into a bottomed cylindrical outer can 11 and an opening of the outer can 11. And a sealing can 12 that covers the opening. A gasket (not shown) is disposed between the inner peripheral edge of the opening of the outer can 11 and the sealing can 12. In a space formed between the outer can 11 and the sealing can 12, an electrode body (not shown) is disposed and a non-aqueous electrolyte (not shown) is injected.

  The outer can 11 and the sealing can 12 are formed of a metal material such as stainless steel. The outer can 11 functions as a positive electrode terminal by being electrically connected to a positive electrode (not shown) of the electrode body. The sealing can 12 functions as a negative electrode terminal by being electrically connected to the negative electrode (not shown) of the electrode body. Since the structure of the electrode body of a lithium ion secondary battery is well-known, detailed description is abbreviate | omitted.

  As shown in FIG. 2, the secondary battery 1 is electrically connected to the circuit board 3 through a positive electrode connection terminal 42 and a negative electrode connection terminal 52.

  Specifically, the positive electrode connection terminal 42 is made of a conductive metal material and is formed in a plate shape. The positive electrode connection terminal 42 includes a vertical portion 42 a that extends upward and vertically from the circuit board 3, and a horizontal portion 42 b that extends horizontally from the upper end of the vertical portion 42 a along the surface of the outer can 11 of the secondary battery 1. The lower end of the vertical portion 42 a is soldered to the circuit board 3, and the lower surface of the horizontal portion 42 b is welded to the outer can 11.

  The negative electrode connection terminal 52 is disposed so as to face the positive electrode connection terminal 42. The negative electrode connection terminal 52 is made of a conductive metal material and is formed in a plate shape. The negative electrode connection terminal 52 includes a vertical portion 52 a that extends upward and vertically from the circuit board 3, and a horizontal portion 52 b that extends horizontally from the upper end of the vertical portion 52 a along the surface of the sealing can 12 of the secondary battery 1. The lower end portion of the vertical portion 52 a is soldered to the circuit board 3, and the upper surface of the horizontal portion 52 b is welded to the sealing can 12.

(Receiving coil)
The power receiving coil 2 receives power supplied from the outside of the battery unit 10, and is disposed above the secondary battery 1 as shown in FIGS. 1 and 2. As shown in FIG. 3, the power receiving coil 2 has an outer diameter smaller than the outer diameter of the secondary battery 1, and the position of the central axis is the same as the position of the central axis of the secondary battery 1 in plan view. I have not done it. That is, the power receiving coil 2 is disposed near the peripheral edge of the secondary battery 1 in plan view. Between the receiving coil 2 and the secondary battery 1, a magnetic shielding sheet (not shown) for preventing the magnetic flux generated in the receiving coil 2 from affecting the secondary battery 1 is disposed.

  The power receiving coil 2 is formed in an annular shape by winding a wire such as a copper wire. As shown in FIG. 2, the end portion 21 of the wire constituting the power receiving coil 2 extends downward and is soldered to the circuit board 3. Thereby, the power receiving coil 2 is electrically connected to the circuit board 3.

(Circuit board)
As shown in FIGS. 2 and 4, the circuit board 3 has a disk shape and is disposed below the secondary battery 1. The outer diameter of the circuit board 3 is larger than the outer diameter of the secondary battery 1 and is substantially equal to the outer diameter of the case 6. As described above, the circuit board 3 is electrically connected to the secondary battery 1 and the power receiving coil 2.

  A plurality of circuit components 31 are mounted on the upper surface of the circuit board 3. That is, the circuit board 3 is disposed so that the surface on which the circuit component 31 is mounted faces the secondary battery 1. The circuit component 31 includes a voltage regulator that converts a voltage output from the secondary battery 1 and outputs a voltage having the same magnitude as the voltage output from the replaced primary battery. The circuit component 31 includes, for example, a charging IC and a protection IC for controlling charging of the secondary battery 1.

(Positive output terminal)
The positive electrode output terminal 41 has a plate shape, and as shown in FIG. 2, an upper portion 41 a provided along the upper surface of the multilayer body L of the circuit board 3, the secondary battery 1, and the power receiving coil 2, It includes a bottom portion 41b provided along the lower surface, and a connecting portion 41c that connects the upper portion 41a and the bottom portion 41b. The upper part 41a of the positive electrode output terminal 41 is arranged at a position corresponding to the positive electrode of the primary battery to be replaced.

  In the first embodiment, the upper surface of the upper portion 41a is positioned slightly above the upper surface of the power receiving coil 2 positioned at the upper end of the multilayer body L, but is not particularly limited thereto. For example, the upper surface of the upper portion 41a and the upper surface of the power receiving coil 2 may be located on the same plane, and the upper surface of the upper portion 41a is the upper surface of the secondary battery 1 and the upper surface of the power receiving coil 2 in the vertical direction. It may be located between.

  As shown in FIGS. 3 and 4, the upper portion 41 a and the bottom portion 41 b of the positive electrode output terminal 41 extend from the peripheral portion of the case 6 toward the power receiving coil 2, but do not reach the power receiving coil 2. That is, the positive electrode output terminal 41 is provided at a position that does not overlap the power receiving coil 2 when viewed from the stacking direction of the circuit board 3, the secondary battery 1, and the power receiving coil 2.

  The positive output terminal 41 is electrically connected to the circuit board 3. Specifically, the positive electrode output terminal 41 is a conductive metal plate, and the bottom 41 b is soldered to the circuit board 3. The metal plate constituting the positive electrode output terminal 41 is made of, for example, copper phosphate, and may be plated with gold or tin.

(Negative output terminal)
The negative electrode output terminal 51 is provided at a position corresponding to the negative electrode of the primary battery to be replaced. Specifically, as shown in FIG. 4, the negative electrode output terminal 51 has a disk shape and is provided near the peripheral edge of the circuit board 3 on the lower surface of the circuit board 3.

  The negative output terminal 51 is electrically connected to the circuit board 3. Specifically, the negative electrode output terminal 51 is a conductive metal foil or a metal plate, and is soldered to the copper foil pattern of the circuit board 3. The metal foil or metal plate constituting the negative electrode output terminal 51 can be formed of phosphor bronze or the like, for example, and may be plated with gold or tin. Alternatively, the negative electrode output terminal 51 may be only a copper foil pattern without using a conductive metal foil or metal plate. The copper foil pattern in this case may be subjected to solder plating or gold plating.

  Note that the positions of the positive electrode output terminal 41 and the negative electrode output terminal 51 can be appropriately changed according to the positions of the positive electrode and the negative electrode of the primary battery to be replaced. Moreover, the shape of the positive electrode output terminal 41 and the negative electrode output terminal 51 is not limited to the above-mentioned thing, For example, the position or shape of the positive electrode input terminal and negative electrode output terminal of an electronic device, or the battery provided in the electronic device It can be changed in consideration of various factors such as the size or shape of the arrangement space.

(Case)
The case 6 accommodates the secondary battery 1, the power receiving coil 2, and the circuit board 3, and has a side wall 61 and is formed in a substantially cylindrical shape as shown in FIGS. 1 and 2. The circuit board 3, the secondary battery 1, and the power receiving coil 2 are stacked in this order along the central axis direction of the case 6.

  Case 6 has the same outer diameter and dimensions as the primary battery to be replaced. Thereby, it becomes possible to replace the primary battery with the battery unit 10 without arranging a spacer or the like in the arrangement space of the battery provided in the electronic device. The material of the case 6 is not particularly limited, and examples thereof include an acrylic resin or PP (polypropylene).

  As shown in FIGS. 5 and 6, the case 6 includes a battery housing portion 62 and a coil housing portion 63 provided above the battery housing portion 62. The battery housing portion 62 and the coil housing portion 63 are hollow portions that house the secondary battery 1 and the power receiving coil 2, respectively. The size of the battery housing portion 62 is larger than the size of the coil housing portion 63. That is, the coil housing part 63 is defined by a side surface 63 a provided so as to surround the power receiving coil 2, and the battery housing part 62 is provided below the coil housing part 63 with the secondary battery 1 having a larger outer diameter than the power receiving coil 2. It is defined by a side surface 62a provided to surround. Above the battery accommodating part 62, parts other than the coil accommodating part 63 are solid (solid part 64). Here, the “solid” portion refers to a portion having no space inside. In the case 6, most of the side surface 63 a of the coil housing portion 63 is located inside the side surface 62 a of the battery housing portion 62, but a part thereof is located outside the side surface 62 a. Thereby, the mounting part 65 which can mount a part of receiving coil 2 is formed between the side surface 62a and the side surface 63a.

  The case 6 is provided with an output terminal accommodating portion 66 that accommodates the positive output terminal 41 and a wire material accommodating portion 67 that accommodates an end portion of the wire constituting the power receiving coil 2. The case 6 is also provided with connection terminal accommodating portions 68 and 69 for accommodating the positive electrode connection terminal 42 and the negative electrode connection terminal 52, respectively.

  More specifically, the output terminal accommodating portion 66 has concave portions 66a, 66b, and 66c in which the upper portion 41a, the bottom portion 41b, and the connecting portion 41c of the positive electrode output terminal 41 are respectively disposed. The recess 66 a is formed on the upper surface of the solid portion 64, and the recess 66 b is formed on the lower end surface of the side wall 61. The recess 66c is formed to extend in the vertical direction on the outer peripheral surface of the side wall 61, and is continuous with the recesses 66a and 66b. Instead of the recess 66c, a hole penetrating the side wall 61 in the vertical direction and continuing to the recesses 66a and 66b may be provided.

  The wire rod accommodating portion 67 is provided at a position facing the output terminal accommodating portion 66, and has recesses 67a, 67b, and 67c. The recess 67 a is formed on the upper end surface of the side wall 61, and the recess 67 b is formed on the lower end surface of the side wall 61. The recess 67c is formed to extend in the vertical direction on the outer peripheral surface of the side wall 61, and is continuous with the recesses 67a and 67b. In addition, the wire accommodating part 67 may be a recess provided on the inner peripheral surface of the side wall 61 and extending in the vertical direction, or may be a hole penetrating the side wall 61 in the vertical direction.

  The connection terminal accommodating portions 68 and 69 are concave portions formed on the inner peripheral surface of the side wall 61 and extending in the vertical direction, and are disposed at positions facing each other. A vertical portion 42 a of the positive electrode output terminal 42 is disposed in the connection terminal accommodating portion 68, and a vertical portion 52 a of the negative electrode output terminal 52 is disposed in the connection terminal accommodating portion 69. The connection terminal accommodating portions 68 and 69 may be holes that extend upward from the lower end surface of the side wall 61 and open to the inner peripheral surface.

[Battery unit assembly method]
Next, a method for assembling the battery unit 10 configured as described above will be described.

  As shown in FIG. 5, first, the negative electrode output terminal 51 and the circuit board 3 are electrically connected by soldering. Moreover, the secondary battery 1 and the circuit board 3 are electrically connected through the positive electrode connection terminal 42 and the negative electrode connection terminal 52 by soldering and welding. A magnetic shielding sheet (not shown) is disposed on the upper surface of the secondary battery 1.

  Next, the connected secondary battery 1 and circuit board 3 are inserted into the battery housing portion 62 from below the case 6. At this time, the positive electrode connection terminal 42 and the negative electrode connection terminal 52 are disposed in the connection terminal accommodating portions 68 and 69, respectively. Further, since the outer diameter of the circuit board 3 is substantially equal to the outer diameter of the case 6, the upper surface of the circuit board 3 comes into contact with the lower end surface of the side wall 61 of the case 6.

  On the other hand, the power receiving coil 2 is inserted into the coil housing portion 63 from above the case 6. At this time, a part of the power receiving coil 2 is placed on the placement unit 65, and the other part is placed on the secondary battery 1 via a magnetic shielding sheet (not shown). The magnetic shielding sheet may be disposed on the bottom surface of the receiving coil 2 with the same size as the receiving coil 2 or may be disposed on the upper surface of the secondary battery 1 with the same size as the secondary battery 1. The latter has a greater magnetic shielding effect. In addition, in order to protect the receiving coil 2, it is preferable to cover the opening at the upper end of the case 6 with a protective film (not shown) or the like.

  Further, as shown in FIGS. 5 and 6, the end portion 21 of the wire constituting the power receiving coil 2 is passed through the recesses 67 a, 67 b and 67 c of the wire accommodating portion 67 and soldered to the upper surface of the circuit board 3. Further, the upper portion 41a, the bottom portion 41b, and the connecting portion 41c of the positive electrode output terminal 41 are disposed in the recesses 66a, 66b, and 66c of the output terminal accommodating portion 66, respectively, and the bottom portion 41b is soldered to the upper surface of the circuit board 3. .

  Thereafter, a shrink tube (not shown) made of a heat-shrinkable resin material such as PET (polyethylene terephthalate) is placed on the outer peripheral surface of the case 6 and heated to cause heat shrinkage. The secondary battery 1, the power receiving coil 2, the circuit board 3, the positive electrode output terminal 41, the negative electrode output terminal 51, and the case 6 are integrated by the shrink tube after heat shrinkage, and the battery unit 10 is completed. The shrink tube after the heat shrinkage covers the side surfaces of the battery unit 10 and the peripheral portions of the top surface and the bottom surface, but at least a part of each of the upper portion 41a of the positive electrode output terminal 41 and the negative electrode output terminal 51 is exposed from the shrink tube. In addition, the means for integrating the components of the battery unit 10 is not limited to the shrink tube. For example, the components may be integrated with an adhesive or the like.

[Inserting battery units into electronic devices]
As described above, the battery unit 10 is provided with the positive electrode output terminal 41 and the negative electrode output terminal 51 at positions corresponding to the positive electrode and the negative electrode of the primary battery in order to be compatible with the primary battery used in the electronic device. Yes. Therefore, when the battery unit 10 is inserted into the electronic device instead of the primary battery, as shown in FIG. 7, the positive output terminal 41 contacts the positive input terminal P of the electronic device, and the negative output terminal 51 becomes the electronic device. Contact the negative input terminal N of the device.

  The battery unit 10 attached to the electronic device supplies power necessary for the operation of the electronic device to the electronic device. At this time, the battery unit 10 converts the output voltage of the secondary battery 1 by the circuit component 31 (voltage regulator) provided on the circuit board 3, and generates a voltage equivalent to the output voltage of the replaced primary battery. Output. For this reason, even if the output voltage of the secondary battery 1 and the output voltage of the replaced primary battery are different, there is no problem with the operation of the electronic device. In addition, what is necessary is just to select an appropriate voltage regulator according to the output voltage of the secondary battery 1, and the voltage (output voltage of a primary battery) which should be output with respect to an electronic device.

[Charging electronic devices]
In the electronic device in which the battery unit 10 is inserted, the secondary battery 1 can be charged in a non-contact manner. As shown in FIG. 8, the charging system 20 for charging the secondary battery 1 includes a battery unit 10, a power feeding coil 7, and a circuit board 8.

  The power feeding coil 7 supplies power to the power receiving coil 2 of the battery unit 10. The feeding coil 7 is formed in an annular shape by winding a wire such as a copper wire. The end portions of the wire constituting the power supply coil 7 are soldered to the circuit board 8 so that the power supply coil 7 and the circuit board 8 are electrically connected.

  The circuit board 8 supplies power to the power feeding coil 7, and a plurality of circuit components 81 are mounted on the upper surface thereof. The circuit component 81 includes a power supply IC for controlling power supply of the power supply coil 7 to the power receiving coil 2.

  When charging the secondary battery 1 of the battery unit 10 inserted in the electronic device, the power feeding coil 7 is disposed so as to face the power receiving coil 2. When power is supplied from the circuit board 8 to the power supply coil 7 in this state, a magnetic flux is generated in the power supply coil 7, and an induced current flows through the power receiving coil 2 due to the influence of this magnetic flux. The induced current flowing in the power receiving coil 2 is supplied to the secondary battery 1 via the circuit board 3. In this way, the secondary battery 1 of the battery unit 10 is charged in a non-contact manner.

  As described above, the battery unit 10 according to the first embodiment includes the power receiving coil 2 and the circuit board 3 necessary for charging the secondary battery 1. Moreover, in the battery unit 10, the positive electrode and negative electrode output terminals 41 and 51 are provided at positions corresponding to the positive electrode and the negative electrode of the primary battery inserted into the electronic device, respectively. Therefore, the primary battery of the electronic device can be replaced with the battery unit 10 without changing the electronic device.

  In the battery unit 10, the positive output terminal 41 is provided so as not to overlap the power receiving coil 2 when viewed from the stacking direction of the circuit board 3, the secondary battery 1, and the power receiving coil 2. Thereby, it is possible to reduce the interference of the magnetic flux generated in the power receiving coil 2 with the positive electrode output terminal 41 when an induced current flows through the power receiving coil 2.

Second Embodiment
Hereinafter, the battery unit 10 </ b> A according to the second embodiment will be described with reference to FIGS. 9 and 10. The battery unit 10A is the same as the battery unit 10 except for the configuration of the positive electrode output terminal 41A and the case 6A from the battery unit 10 according to the first embodiment.

  The positive output terminal 41A is provided along the outer peripheral surface of the side wall 61A of the case 6A and over the half circumference of the side wall 61A. The lower end of the positive output terminal 41A is soldered to the upper surface of the circuit board 3. A convex portion 41Ad extending in the vertical direction is formed on the inner peripheral surface of the positive electrode output terminal 41A. A concave output terminal accommodating portion 66A extending in the vertical direction is formed on the outer peripheral surface of the side wall 61A of the case 6A. By arranging the convex portion 41Ad of the positive electrode output terminal 41A in the output terminal accommodating portion 66A, the positive electrode output terminal 41A is supported by the case 6A.

  In addition, 41 A of positive electrode output terminals should just be able to contact the positive electrode input terminal of an electronic device, when battery unit 10A is inserted in an electronic device. For example, the length in the circumferential direction of the positive electrode output terminal 41A may be longer or shorter than the half length of the side wall 61A, or the positive electrode output terminal 41A may be provided over the entire circumference of the side wall 61A.

  As in the first embodiment, the positive electrode output terminal 41A of the battery unit 10A is provided at a position corresponding to the positive electrode of the primary battery to be replaced. That is, although not particularly illustrated, when the battery unit 10A is inserted into an electronic device instead of the primary battery, the positive electrode output terminal 41A contacts the positive electrode input terminal of the electronic device. For this reason, the battery unit 10A can also be replaced with a primary battery of the electronic device without changing the electronic device. As described above, the positive electrode output terminal 41A can be integrated with other components by an adhesive or the like. Further, after components other than the positive electrode output terminal 41A are integrated by the shrink tube and the positive electrode output terminal 41A is arranged so as to sandwich the upper and lower sides of the components integrated by the shrink tube from the outside of the shrink tube, the positive electrode output terminal 41A is You may solder to the bottom face of the circuit board 3.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the circuit board, the secondary battery, and the power receiving coil are laminated in this order along the central axis direction of the case, but the present invention is not limited thereto, and the secondary battery, the circuit board are not limited thereto. , And the receiving coil can be laminated in this order.

  In the above embodiment, the outer diameter of the power receiving coil is smaller than the outer diameter of the secondary battery. However, the outer diameter of the power receiving coil may be equal to the outer diameter of the secondary battery. It may be larger than the outer diameter of the secondary battery. Further, the positions of the central axes of the secondary battery and the power receiving coil may or may not match in plan view.

  In the said embodiment, although the case was cylindrical, it is not limited to this in particular. The case can have various shapes such as a cylindrical shape having a horizontal cross section of a polygon, an ellipse, or a fan.

  In the said embodiment, although the circuit board, the secondary battery, and the receiving coil were circular in planar view, these shapes can be changed suitably. For example, at least one of the circuit board, the secondary battery, and the power receiving coil may have a polygonal shape or the like in plan view. The shape of the secondary battery is not limited to the coin shape, and may be a flat shape other than the coin shape, a cylindrical shape, a prismatic shape, or the like.

  In the above embodiment, the secondary battery of the battery unit is a lithium secondary ion battery, and the outer can functions as the positive electrode terminal and the sealing can functions as the negative electrode terminal. May function as a positive electrode terminal. The secondary battery may be other than a lithium secondary ion battery.

  In the above embodiment, the positive electrode output terminal is disposed along the upper surface or the side surface of the case, and the negative electrode output terminal is disposed along the lower surface of the circuit board, but the position of the positive electrode output terminal and the position of the negative electrode output terminal are It can also be replaced. Moreover, both a positive electrode and a negative electrode output terminal may be provided along the lower surface of a board | substrate, and may be provided along the upper surface or side surface of a case. That is, when viewed from the stacking direction of the circuit board, the secondary battery, and the receiving coil, the negative output terminal may be configured not to overlap the receiving coil, or both the positive output terminal and the negative output terminal may be the receiving coil. You may comprise so that it may not overlap. From the viewpoint of the magnetic flux of the power receiving coil and each output terminal, it is preferable that at least one of the output terminals does not overlap with the power receiving coil when viewed from the product bidirectional direction, but both output terminals overlap with the power receiving coil. It is also possible to provide it.

10, 10A Battery unit 1 Secondary battery 2 Power receiving coil 3 First circuit board 31 Circuit component 41 Positive output terminal 41a Upper part 41b Bottom part 41c Connection part 51 Negative output terminal 6, 6A Case 20 Charging system 7 Feeding coil 8 Second coil Circuit board

Claims (7)

A battery unit compatible with a primary battery used in an electronic device,
A secondary battery,
A power receiving coil for receiving power supplied from outside the battery unit;
A first circuit board that is electrically connected to the secondary battery and the power receiving coil and charges the secondary battery using the power received by the power receiving coil;
A case for housing the secondary battery, the power receiving coil, and the first circuit board;
A positive output terminal electrically connected to the first circuit board and provided at a position corresponding to the positive electrode of the primary battery;
A negative output terminal electrically connected to the first circuit board and provided at a position corresponding to the negative electrode of the primary battery;
Bei to give a,
The first circuit board, the secondary battery, and the power receiving coil are stacked in this order along the central axis direction of the case,
At least one of the positive electrode output terminal and the negative electrode output terminal is located outside the outer shape of the power receiving coil when viewed from the stacking direction of the first circuit board, the secondary battery, and the power receiving coil. A battery unit is provided . The battery unit according to claim 1 ,
At least one of the positive output terminal and the negative output terminal is
An upper portion provided along an upper surface of a laminate of the first circuit board, the secondary battery, and the power receiving coil;
A bottom provided along the bottom surface of the laminate;
A connecting portion that is provided along a side surface of the laminate, and connects the top and the bottom;
Including a battery unit. The battery unit according to claim 1 or 2 ,
The battery unit, wherein a dimension of the power receiving coil is smaller than a dimension of the secondary battery in a direction perpendicular to the stacking direction. The battery unit according to any one of claims 1 to 3 ,
The other of the positive electrode output terminal and the negative output terminal is a metal foil provided on the surface of the first circuit board, the battery unit. The battery unit according to any one of claims 1 to 4 , further comprising:
A battery unit comprising a voltage regulator that converts a voltage output from the secondary battery and outputs a voltage having a magnitude equivalent to a voltage output from the primary battery. The battery unit according to any one of claims 1 to 5 ,
The case is a battery unit having an outer diameter and dimensions equivalent to those of the primary battery. The battery unit according to any one of claims 1 to 6 ,
A power supply coil for supplying power to the power reception coil;
A second circuit board that is electrically connected to the power supply coil and supplies power to the power supply coil;
A charging system comprising:

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