JP2019040860A - Battery pack, wireless power transmission system and hearing aid - Google Patents

Abstract

To provide a battery pack, a wireless power transmission system and a hearing aid that can be miniaturized, and that are excellent in strength.SOLUTION: A battery pack 1 comprises: a secondary battery 2 that has a battery positive electrode terminal 18 and a battery negative electrode terminal 19; a coil member 28 arranged at an upper side of the secondary battery 2; a circuit board 29 arranged at the upper side of the secondary battery 2, and electrically connected with the battery positive electrode terminal 18, the battery negative electrode terminal 19 and the coil member 28; and a first insulation resin fixing part 8A for fixing the coil member 28 and the circuit board 29.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery pack, a wireless power transmission system including the battery pack, and a hearing aid.

  Conventionally, a secondary battery unit that can be charged wirelessly is known. Such a secondary battery unit is highly convenient because it can be charged wirelessly using a corresponding charger while attached to an electronic device.

  Such a secondary battery unit is disclosed in Patent Document 1, for example. FIG. 3 of Patent Document 1 illustrates a rechargeable battery unit including a battery component made of a secondary battery and an inductor component made of a winding coil and a charging circuit arranged on one surface in the thickness direction. .

US Pat. No. 6,498,455

  In the battery unit described in Patent Document 1, an inductor component is disposed on one surface in the thickness direction of the secondary battery. In the inductor component, only the wound coil and the charging circuit are accommodated in a casing. That is, since it is not necessary to cover the entire secondary battery with the casing, the size reduction is achieved.

  However, the winding coil and the charging circuit are not supported inside the casing of the inductor component, and the strength of the inductor component is inferior. Specifically, when the terminal of the electronic device is brought into contact with the terminal of the inductor component, the charging circuit and the wound coil inside the inductor component are greatly recessed in the thickness direction due to the pressure toward the other side of the thickness direction of the terminal of the electronic device. A malfunction occurs. As a result, the connectivity with the terminals of the electronic device is reduced, or the inductor component is damaged.

  An object of the present invention is to provide a battery pack, a wireless power transmission system, and a hearing aid that can be reduced in size and are excellent in strength.

  The present invention [1] includes a secondary battery having a battery positive terminal disposed on the upper side and a battery negative terminal disposed on the lower side, and a coil disposed on the upper side and / or the lower side of the secondary battery. A member, a circuit board disposed on an upper side and / or a lower side of the secondary battery, and electrically connected to the battery positive terminal, the battery negative terminal, and the coil member; and the coil member and the circuit board. A battery pack including an insulating resin fixing portion to be fixed is included.

  According to this battery pack, since the coil member and the circuit board are fixed by the insulating resin fixing portion, the strength is excellent. In addition, since the coil member and the circuit board are arranged on the upper side and / or the lower side of the battery and a casing that covers the side surface of the battery is not required, the size (small diameter) is excellent.

  The present invention [2] includes the battery pack according to [1], wherein the coil member is disposed on the upper side of the secondary battery, and the circuit board is disposed on the upper side of the secondary battery. .

  That is, the present invention [2] includes a secondary battery having a battery positive terminal disposed on the upper side and a battery negative terminal disposed on the lower side, a coil member disposed on the upper side of the secondary battery, A circuit board that is arranged on the upper side of the secondary battery and is electrically connected to the battery positive terminal, the battery negative terminal, and the coil member; and an insulating resin fixing portion that fixes the coil member and the circuit board. A battery pack is included.

  According to this battery pack, since the insulating resin fixing portion fixes the coil member and the circuit board, the coil member and the circuit can be used even when pressure toward the circuit board is applied to the coil member. The position with respect to the substrate hardly changes and the strength is improved. Therefore, when the terminal of the electronic device is contacted from the upper side of the battery pack, the coil member or the circuit board is recessed downward with respect to the pressure by which the terminal of the electronic device pushes the coil member and the circuit board downward. Can be suppressed. As a result, it is possible to suppress deterioration in connectivity with the electronic device and damage to the battery pack.

  In addition, since the coil member and the circuit board are arranged on the upper side of the secondary battery, it is not necessary to arrange protective members such as a housing for protecting the coil member on the side surface and the lower side of the secondary battery. Therefore, the battery pack can be downsized.

  The present invention [3] includes the battery pack according to [1] or [2], wherein the insulating resin fixing portion includes a coil member when projected in the vertical direction.

  According to this battery pack, since the insulating resin fixing portion is substantially the same as or larger than the coil member in plan view, the coil member can be stably fixed in the entire range of the coil member in plan view. it can. Therefore, the strength of the battery pack can be improved over a wide range in plan view.

  [4] The battery pack according to any one of [1] to [3], wherein the coil member is a sheet coil including an insulating sheet and a coil pattern disposed on the insulating sheet. It has.

  According to this battery pack, since the coil member is a sheet coil, the coil member is thinner in the vertical direction than the wound coil in which the copper wire is wound in the vertical direction. Therefore, further miniaturization is possible. Moreover, since the coil member is provided with the coil pattern, it is less likely to be deformed with respect to the pressure in the vertical direction as compared with the wound coil. Therefore, it is excellent in strength.

  The present invention [5] includes the battery pack according to [4], wherein the coil member includes a plurality of sheet coils, and the insulating resin fixing portion is disposed between the plurality of sheet coils. ing.

  According to this battery pack, since a plurality of sheet coils are provided, the power receiving efficiency is excellent. Moreover, since the insulating resin fixing | fixed part is arrange | positioned between several sheet coils, the fall of the power receiving efficiency by the axial shift of the center axis | shaft of several sheet coils can be suppressed. Therefore, excellent power receiving efficiency can be exhibited according to the number of sheet coils.

  The present invention [6] includes the battery pack according to any one of [1] to [5], further including a housing that is disposed on the upper side of the battery pack and accommodates the coil member and the circuit board. It is out.

  According to this battery pack, the coil member and the circuit board can be protected by the housing against an external impact.

  In the present invention [7], the ratio of the volume of the insulating resin fixing portion to the total volume of the volume of the insulating resin fixing portion arranged inside the housing and the volume of the gap inside the housing However, the battery pack described in [6] is included.

  According to this battery pack, since the insulating resin fixing portion is sufficiently present inside the housing, the strength of the battery pack can be improved more reliably.

  The present invention [8] includes the battery pack according to any one of [1] to [7], wherein the insulating resin fixing portion is a cured body of an insulating thermosetting sheet.

  According to this battery pack, since the insulating resin fixing portion is formed of an insulating thermosetting sheet, the vertical distance between the coil member and the circuit board can be made uniform in the sheet surface direction. . Therefore, it has excellent dimensional stability.

  The present invention [9] includes a wireless power transmission system including the battery pack according to any one of [1] to [8] and a power transmission device including a power transmission coil.

  According to this wireless power transmission system, by driving the power transmission device, it is possible to wirelessly transmit power to the secondary battery of the battery pack, so that the secondary battery can be wirelessly charged.

  This invention [10] is provided in the inside of the hearing aid housing | casing which has a battery pack as described in any one of [1]-[8], the accommodating part which accommodates the said battery pack, and the said hearing aid housing | casing. A hearing aid including a microphone means, an amplifying means, and a speaker unit is included.

  According to this hearing aid, downsizing can be achieved. Moreover, since the strength of the battery pack is excellent, the durability of the hearing aid is excellent.

  The battery pack and wireless power transmission system of the present invention can be miniaturized and have excellent strength. According to the hearing aid of the present invention, downsizing is possible and the durability is excellent.

1A-B are perspective views of a battery pack according to a first embodiment of the present invention. FIG. 1A is a perspective view as viewed from above, and FIG. 1B is a perspective view as viewed from below. FIG. 2 is a cross-sectional perspective view taken along line AA of the battery pack shown in FIG. 1A. 3A-B show a side cross-sectional view of the battery pack shown in FIG. 1A, FIG. 3A shows a cross-sectional side view along AA, and FIG. 3B shows a cross-sectional side view along BB. 4A and 4B are development views of a substrate with a coil used in the battery pack shown in FIG. 1A, FIG. 4A is a plan view, and FIG. 4B is a bottom view. FIG. 5 is a side sectional view taken along line AA of the substrate with a coil shown in FIG. 4A. 6 shows an exploded perspective view (excluding the resin fixing portion) of the battery pack shown in FIG. 1A. 7A-C show a process diagram in the manufacturing direction of the battery pack shown in FIG. 1A, FIG. 7A shows a process of fixing the first intermediate, and FIG. 7B fills the first intermediate with an insulating resin fixing part. FIG. 7C shows a step of obtaining a battery pack. FIG. 8 shows a block diagram of the first embodiment of the wireless power transmission system of the present invention. 9A-B show a first embodiment of the hearing aid of the present invention, FIG. 9A is a perspective view in an open state, and FIG. 9B is a perspective view in a closed state. FIG. 10 shows a side cross-sectional view (embodiment including a plurality of coil members) of a modification of the first embodiment of the battery pack of the present invention. 11A-B show a modification of the coiled substrate used in the first embodiment of the battery pack of the present invention, FIG. 11A is a development view of the coiled substrate used in the battery pack shown in FIG. 10, and FIG. The expanded view of the board | substrate with a coil which provides a coil pattern in the lower surface of a positive electrode terminal part is shown. 12A-B are perspective views of a second embodiment of the battery pack of the present invention, FIG. 12A is a perspective view viewed from the upper side, and FIG. 12B is a perspective view viewed from the lower side. FIG. 13 is a cross-sectional perspective view taken along line AA of the battery pack shown in FIG. 12A. 14A-E show a process diagram of the method for manufacturing the battery pack shown in FIG. 12A, FIG. 14A shows a process of placing a magnetic sheet on a substrate with a coil, and FIG. 14B shows an insulating thermosetting on the second intermediate. 14C is a step of compressing the second intermediate and the insulating thermosetting sheet, FIG. 14D is a step of curing the second intermediate and the insulating thermosetting sheet, and FIG. The process of arrange | positioning a secondary battery to a 3rd intermediate body is shown. FIG. 15 shows a schematic layout of each member of the third embodiment of the battery pack of the present invention. FIG. 16 shows a schematic layout of each member of the first embodiment of the battery pack of the present invention. FIG. 17 shows a schematic layout of each member of the fourth embodiment of the battery pack of the present invention. FIG. 18 is a schematic layout diagram of the fifth embodiment of the battery pack of the present invention. FIG. 19 shows a schematic layout of a modification of the third embodiment of the battery pack of the present invention (a configuration in which coil members are provided on the upper side and the lower side). FIG. 20 shows a schematic layout of a modification of the battery pack according to the third embodiment of the present invention (a mode in which a coil member and a circuit board are provided on the upper side and the lower side).

  Embodiments of a battery pack, a wireless power transmission system, and a hearing aid of the present invention will be described below with reference to the drawings. In FIG. 3B, the vertical direction of the paper surface is the vertical direction (thickness direction, first direction), the upper side of the paper surface is the upper side (one side in the thickness direction, the first direction side), and the lower side of the paper surface is the lower side (thickness direction). The other side, the other side in the first direction). In FIG. 3B, the left-right direction on the paper surface is the left-right direction (second direction orthogonal to the first direction), the left side on the paper surface is the left side (the second direction one side), and the right side on the paper surface is the right side (the other side in the second direction). It is. In FIG. 3B, the paper thickness direction is the front-rear direction (a third direction orthogonal to the first direction and the second direction), the front side of the paper is the front side (one side in the third direction), and the back side of the paper is the rear side (the first side). 3 direction other side). Specifically, it conforms to the direction arrow in each figure. These orientation definitions are not intended to limit the orientation of the battery pack, wireless power transmission system and hearing aid during manufacture and use. 4A-B and 11A-B, the first cover insulating layer, the second cover insulating layer, and the third cover insulating layer are omitted.

<First Embodiment>
1. Battery Pack A first embodiment of the battery pack of the present invention will be described with reference to FIGS. 1A to 6B. As shown in FIGS. 1A-B and 3, the battery pack 1 of the first embodiment includes a secondary battery 2, a substrate 3 with a coil, a magnetic sheet 4, a housing 5, an insulating adhesive layer 6, and a conductive bonding layer. 7 and an insulating resin fixing portion 8. Hereinafter, these members will be described.

(Secondary battery)
As shown in FIGS. 1A-B and 6, the secondary battery 2 is a chargeable / dischargeable battery and has a substantially cylindrical shape (particularly, a button shape). The secondary battery 2 has a step in the middle in the vertical direction so that the lower end of the secondary battery 2 is slightly smaller in diameter than the upper part.

  The secondary battery 2 includes a battery positive terminal 18 and a battery negative terminal 19.

  The battery positive terminal 18 is disposed on the upper side of the secondary battery 2. Specifically, the battery positive terminal 18 is formed on the upper surface and the upper peripheral side surface of the secondary battery 2.

  The battery negative terminal 19 is disposed on the lower side of the secondary battery 2. Specifically, the battery negative electrode terminal 19 is formed on the lower surface of the secondary battery 2 and the peripheral side surface of the lower end portion.

  Specific examples of the secondary battery 2 include a lithium ion secondary battery, a nickel hydride secondary battery, and a silver zinc secondary battery.

(Board with coil)
As shown in FIGS. 4A-B (development views), the coiled substrate 3 is integrally provided with a coil member 28 and a circuit substrate 29.

  The coil member 28 is a sheet coil that is a power receiving coil that receives power transmitted by a power transmitting device described later, and is specifically a power receiving coil that can generate power using a magnetic field generated from a power transmitting coil described later.

  4A-B and FIG. 5, the coil member 28 includes a first base insulating layer 10 as an insulating sheet, a first coil pattern 11 and a second coil pattern 12 as coil patterns, and a first coil cover. An insulating layer 13 and a second coil cover insulating layer 14 are provided.

  The first insulating base layer 10 forms the outer shape of the coil member 28 and has a substantially circular shape in plan view. The first insulating base layer 10 is formed to be slightly smaller than the outer shape of the secondary battery 2 when projected in the vertical direction (thickness direction).

  A via opening 15 penetrating in the up-down direction is formed in the approximate center of the first base insulating layer 10 in plan view. A coil via portion 16 made of a metal conduction portion is disposed in the via opening 15. The coil via part 16 is exposed from the upper surface and the lower surface of the first base insulating layer 10. The coil via part 16 is formed integrally with the first coil pattern 11 and the second coil pattern 12 and electrically connects them.

  The first base insulating layer 10 is made of an insulating material such as a synthetic resin such as a polyimide resin, a polyamideimide resin, an acrylic resin, a polyether nitrile resin, a polyether sulfone resin, a polyethylene terephthalate resin, a polyethylene naphthalate resin, or a polyvinyl chloride resin. Formed from material. Preferably, it is formed from a polyimide resin.

  The thickness of the 1st base insulating layer 10 is 1 micrometer or more, for example, Preferably, it is 5 micrometers or more, for example, is 100 micrometers or less, Preferably, it is 60 micrometers or less.

  The first coil pattern 11 is disposed on the upper surface of the first insulating base layer 10. Specifically, the first coil pattern 11 is disposed on the upper side of the first base insulating layer 10 so that the lower surface of the first coil pattern 11 is in contact with the upper surface of the first base insulating layer 10. The first coil pattern 11 is a coil-shaped wiring pattern made of the wiring 17.

  The first coil pattern 11 is formed in a spiral shape from the coil via portion 16 (radial center) outward in the radial direction in plan view. The first coil pattern 11 is formed in a spiral shape until reaching the outer peripheral end near the third joint base portion 35, and is connected (continuously) to the eighth connection wiring 57 at the outer peripheral end near the third joint base portion 35. ing.

  The side sectional view shape along the radial direction of the wiring 17 constituting the first coil pattern 11 is formed in a substantially rectangular shape as shown in FIG.

  The second coil pattern 12 is disposed on the lower surface of the first insulating base layer 10. Specifically, the second coil pattern 12 is disposed below the first base insulating layer 10 so that the upper surface of the second coil pattern 12 is in contact with the lower surface of the first base insulating layer 10. The second coil pattern 12 is a coil-shaped wiring pattern made of the wiring 17.

  As shown in FIG. 4B, the second coil pattern 12 is formed in a spiral shape from the coil via portion 16 toward the outside in the radial direction when viewed from the bottom. The second coil pattern 12 is formed in a spiral shape until reaching the outer peripheral end near the third joint base portion 35, and is connected to the first connection wiring 50 at the outer peripheral end near the third joint base portion 35.

  The side sectional view shape along the radial direction of the wiring 17 constituting the second coil pattern 12 is formed in a substantially rectangular shape.

  Examples of the material constituting the wiring 17 include conductive metals such as copper, silver, gold, nickel, solder, or alloys thereof. Preferably, copper is used.

  The bottom view shape (spiral shape pattern) in the intermediate portion of the second coil pattern 12 is substantially the same as the planar view shape in the intermediate portion of the first coil pattern 11. That is, the width L of the wiring 17 of the second coil pattern 12 and the interval S between the wirings 17 are substantially the same as the width L and the interval S of the wiring 17 of the first coil pattern 11. The number of turns is the same as the number of turns of the first coil pattern 11.

  In each of the first coil pattern 11 and the second coil pattern 12, the width L of the wiring 17 (the radial length of the wiring 17) is, for example, 5 μm or more, preferably 20 μm or more, and, for example, 400 μm or less. The thickness is preferably 200 μm or less.

  In each of the first coil pattern 11 and the second coil pattern 12, the thickness T of the wiring 17 is, for example, 3 μm or more, preferably 10 μm or more, and, for example, 200 μm or less, preferably 100 μm or less.

  In each of the first coil pattern 11 and the second coil pattern 12, the spacing S between the wirings 17 (the radial distance between the wirings 17 adjacent to each other) is, for example, 5 μm or more, preferably 20 μm or more. For example, it is 400 μm or less, preferably 200 μm or less.

  In each of the first coil pattern 11 and the second coil pattern 12, the number of turns of the coil is, for example, 1 or more, preferably 3 or more, and for example, 500 or less, preferably 300 or less.

  The first coil cover insulating layer 13 is disposed on the upper surface of the first coil pattern 11. Specifically, the first coil cover insulating layer 13 is formed so as to cover the upper surface and side surfaces of the first coil pattern 11 and the upper surface of the first base insulating layer 10 exposed from the first coil pattern 11. The coil pattern 11 and the first base insulating layer 10 are disposed on the upper side.

  The first coil cover insulating layer 13 has a substantially circular shape in plan view, and the first coil cover insulating layer 13 includes the first coil pattern 11 when projected in the vertical direction.

  The second coil cover insulating layer 14 is disposed on the lower surface of the second coil pattern 12. Specifically, the second coil cover insulating layer 14 is formed so as to cover the lower surface and side surfaces of the second coil pattern 12 and the lower surface of the first base insulating layer 10 exposed from the second coil pattern 12. The coil pattern 12 and the first base insulating layer 10 are disposed below.

  The second coil cover insulating layer 14 has a substantially circular shape in plan view, and the second coil cover insulating layer 14 includes the second coil pattern 12 when projected in the vertical direction.

  The first coil cover insulating layer 13 and the second coil cover insulating layer 14 are made of the same material as the insulating material described above for the first base insulating layer 10, and are preferably made of polyimide resin.

  The thicknesses of the first coil cover insulating layer 13 and the second coil cover insulating layer 14 are, for example, 2 μm or more, preferably 5 μm or more, and for example, 70 μm or less, preferably 60 μm or less.

  The circuit board 29 is a flexible wiring circuit board having flexibility, and is arranged on the right side of the coil member 28 so as to be continuous with the coil member 28.

  4A-B, the circuit board 29 is connected to the second insulating base layer 20, the control element 21, the battery side circuit positive terminal 22, the external circuit positive terminal 23, and the circuit negative terminal 24. A wiring pattern 25 and a third cover insulating layer 26 are provided.

  The second insulating base layer 20 includes a control circuit base 30, a negative terminal base 31, a positive terminal base 32, a first joint base 33, a second joint base 34, and a third joint base 35. ing.

  The control circuit base portion 30 is a base insulating portion for mounting a control element 21 (described later), and is arranged at the approximate center of the circuit board 29 in plan view. The control circuit base portion 30 has a substantially circular shape in plan view, and is formed to be smaller than the first insulating base layer 10.

  The control circuit base 30 is electrically connected to the connection wiring pattern 25 (first to ninth connection wirings 50 to 59 described later) and the control element 21 (rectifier 47, charge controller 48, and transformer 49 described later). A plurality of base via portions (first to tenth via portions 36 to 45) for connecting to are formed. Specifically, a first via portion 36 for connecting the rectifier 47 and the first connection wiring 50 in the vertical direction, and a second via portion 37 for connecting the rectifier 47 and the second connection wiring 51 in the vertical direction A third via portion 38 for connecting the rectifier 47 and the third connection wiring 52 in the vertical direction, a fourth via portion 39 for connecting the rectifier 47 and the fifth connection wiring 54 in the vertical direction, and a charge controller. A fifth via portion 40 for connecting the 48 and the third connection wiring 52 in the vertical direction, a sixth via portion 41 for connecting the charge controller 48 and the fourth connection wiring 53 in the vertical direction, and a charge controller A seventh via portion 42 for connecting the 48 and the ninth connection wiring 58 in the vertical direction, an eighth via portion 43 for connecting the transformer 49 and the sixth connection wiring 55 in the vertical direction, the transformer 49 and 7th connection wiring 56 A ninth via part 44 for connection in the downward direction, a second 10 via part 45 for connecting the transformer 49 and the tenth connecting wire 59 in the vertical direction is formed. In each of the base via portions 36 to 45, a via opening that penetrates in the vertical direction is formed in the second base insulating layer 20, and a metal conduction portion is disposed in the via opening.

  The negative terminal base portion 31 is a base insulating portion for disposing the circuit negative terminal 24, and is disposed on the front side of the control circuit base portion 30 with an interval. The negative electrode terminal base portion 31 has a substantially circular shape in plan view, and is formed to have substantially the same shape as the first base insulating layer 10.

  The positive terminal base portion 32 is a base insulating portion for disposing the external circuit positive terminal 23, and is disposed on the rear side of the control circuit base portion 30 with an interval. The positive terminal base portion 32 has a substantially circular shape in plan view, and is formed to have substantially the same shape as the first base insulating layer 10.

  The first joint base portion 33 is a base insulating portion for connecting the control circuit base portion 30 and the negative terminal base portion 31, and is disposed on the front side of the control circuit base portion 30. Specifically, the first joint base portion 33 is disposed between the first joint base portion 33 so that the front end thereof is integrally continuous with the negative electrode terminal base portion 31 and the rear end thereof is integrally continuous with the control circuit base portion 30. Has been. The first joint base portion 33 is formed in a substantially rectangular shape in plan view extending in the front-rear direction.

  In the middle of the first joint base portion 33 in the front-rear direction, a plurality (two) of first bent portions 60 are formed at intervals in the front-rear direction. The first bent portion 60 extends linearly in the left-right direction from the left end edge to the right end edge. The first bent portion 60 can be bent at a right angle toward the lower side.

  The second joint base portion 34 is a base insulating portion for connecting the control circuit base portion 30 and the positive terminal base portion 32, and is disposed on the rear side of the control circuit base portion 30. Specifically, the second joint base portion 34 is disposed between the front end of the second joint base portion 34 and the control circuit base portion 30 so that the rear end thereof is continuous with the positive terminal base portion 32. Has been. The 2nd joint base part 34 is formed in the planar view substantially rectangular shape extended in the front-back direction.

  In the middle of the second joint base portion 34 in the front-rear direction, a plurality of (two) second bent portions 61 are formed at intervals in the front-rear direction. The second bent portion 61 extends linearly in the left-right direction from the left end edge to the right end edge. The second bent portions 61 can be bent at right angles toward the upper side.

  The third joint base portion 35 is a base insulating portion for connecting the control circuit base portion 30 and the first base insulating layer 10, and is disposed on the left side of the control circuit base portion 30. Specifically, the third joint base portion 35 has a right end integrally connected to the control circuit base portion 30 and a left end integrally connected to the first base insulating layer 10 therebetween. Has been placed. The third joint base portion 35 is formed in a substantially rectangular shape in plan view extending in the left-right direction.

  The third joint base portion 35 is formed with an eleventh via portion 46 for connecting the second connection wiring 51 and the eighth connection wiring 57 in the vertical direction. The eleventh via portion 46 is formed with a via opening that penetrates the second insulating base layer 20 in the vertical direction, and the via opening is filled with a metal conduction portion.

  In the middle of the third joint base portion 35 in the left-right direction, a plurality (two) of third bent portions 62 are formed at intervals in the left-right direction. The third bent portion 62 extends linearly in the front-rear direction from the front end edge to the rear end edge. The third bent portion 62 can be bent at right angles toward the upper side.

  The battery-side circuit positive terminal 22 is a terminal for supplying the current from the coil member 28 to the battery positive terminal 18 of the secondary battery 2 through the first conductive bonding layer 7A during charging, and At the time of discharging, the current from the battery positive terminal 18 is supplied to the positive terminal (for example, to be described later) of an external electronic device (for example, a hearing aid 90 to be described later) via the first conductive bonding layer 7A and the external circuit positive terminal 23. This is a terminal for supplying to the external device positive terminal 96).

  The battery-side circuit positive terminal 22 is disposed so as to be in contact with the first conductive bonding layer 7A. Specifically, the battery-side circuit positive terminal 22 is disposed on the lower surface of the control circuit base portion 30 and the right front portion. The battery side circuit positive terminal 22 has a substantially circular shape in plan view.

  The external circuit positive terminal 23 is a terminal for supplying the current from the secondary battery 2 to the positive terminal of the external electronic device during discharging.

  The external circuit positive electrode terminal 23 is disposed so as to be in contact with the positive electrode terminal of the external electronic device. Specifically, the external circuit positive electrode terminal 23 has a lower surface of the positive electrode terminal base portion 32 and a substantially center in a bottom view (in the battery pack 1 and the bending circuit 69 shown in FIGS. 1A to 3B, FIG. 6, etc.) It is arranged on the upper surface of the terminal base 32 and the approximate center in plan view. The external circuit positive terminal 23 is formed in a substantially circular shape in plan view. The external circuit positive electrode terminal 23 is slightly smaller than the positive electrode terminal base portion 32 in a plan view, and is formed to have substantially the same shape as a terminal opening 73 (described later) of the housing 5.

  The circuit negative terminal 24 is a terminal for supplying the current from the coil member 28 to the battery negative terminal 19 of the secondary battery 2 at the time of charging, and the current from the battery negative terminal 19 at the time of discharging to the external electron This is a terminal for supplying to the negative terminal of the device.

  The circuit negative terminal 24 is disposed so as to be in contact with both the battery negative terminal 19 of the secondary battery 2 and the second conductive bonding layer 7B. Specifically, the circuit negative electrode terminal 24 is disposed so as to penetrate the negative electrode terminal base portion 31 in the vertical direction at the approximate center of the negative electrode terminal base portion 31 in plan view. That is, the circuit negative terminal 24 includes a terminal-side surface 24A exposed from the upper surface (the lower surface in the battery pack 1 and the bending circuit 69) of the negative electrode terminal base portion 31, and the lower surface (in the battery pack 1 and the bending circuit 69). A battery-side surface 24B exposed from the upper surface). The terminal-side surface 24A and the battery-side surface 24B each have a substantially circular shape in plan view, and are formed to have substantially the same shape.

  The connection wiring pattern 25 is a wiring that electrically connects each terminal (22, 23, 24), each coil pattern (11, 12), and the control element 21. The connection wiring pattern 25 includes a first connection wiring 50, a second connection wiring 51, a third connection wiring 52, a fourth connection wiring 53, a fifth connection wiring 54, a sixth connection wiring 55, a seventh connection wiring 56, and an eighth connection wiring. A connection wiring 57, a ninth connection wiring 58, and a tenth connection wiring 59 are provided.

  As shown in FIG. 2B, the first connection wiring 50 electrically connects the second coil pattern 12 and the rectifier 47. That is, one end of the first connection wiring 50 is connected to the second coil pattern 12, and the other end is connected to the first via portion 36. Specifically, the first connection wiring 50 is disposed so as to extend from the right end of the upper surface of the first base insulating layer 10 to the left end of the lower surface of the control circuit base portion 30 via the third joint base portion 35.

  The second connection wiring 51 electrically connects the first coil pattern 11 and the rectifier 47 via the eighth connection wiring 57 and the eleventh via portion 46. That is, one end of the second connection wiring 51 is connected to the second via portion 37 and the other end is connected to the eleventh via portion 46. Specifically, the second connection wiring 51 extends from the approximate center of the lower surface of the third joint base portion 35 to the left end of the lower surface of the control circuit base portion 30 and is positioned in front of the first connection wiring 50. Is arranged.

  The third connection wiring 52 electrically connects the rectifier 47 and the charge controller 48. That is, one end of the third connection wiring 52 is connected to the third via portion 38, and the other end is connected to the fifth via portion 40. Specifically, the third connection wiring 52 is disposed substantially at the center of the lower surface of the control circuit base 30.

  The fourth connection wiring 53 electrically connects the charge controller 48 and the battery side circuit positive terminal 22. That is, one end of the fourth connection wiring 53 is connected to the sixth via portion 41, and the other end is connected to the battery side circuit positive terminal 22. Specifically, the fourth connection wiring 53 is disposed on the lower surface of the control circuit base 30 from approximately the center to the right front side.

  The fifth connection wiring 54 electrically connects the rectifier 47 and the circuit negative terminal 24. That is, one end of the fifth connection wiring 54 is connected to the fourth via portion 39, and the other end is connected to the circuit negative terminal 24. Specifically, the fifth connection wiring 54 is arranged so as to reach from the approximate bottom surface of the control circuit base 30 to the approximate bottom surface of the negative terminal base 31 via the first joint base 33. .

  The sixth connection wiring 55 electrically connects the battery side circuit positive terminal 22 and the transformer 49. That is, one end of the sixth connection wiring 55 is connected to the battery-side circuit positive terminal 22, and the other end is connected to the eighth via portion 43. Specifically, the sixth connection wiring 55 is arranged on the right side of the lower surface of the control circuit base 30.

  The seventh connection wiring 56 electrically connects the transformer 49 and the external circuit positive terminal 23. That is, one end of the seventh connection wiring 56 is connected to the ninth via portion 44, and the other end is connected to the external circuit positive electrode terminal 23. Specifically, the seventh connection wiring 56 is disposed so as to reach the lower surface front end of the positive terminal base portion 32 via the second joint base portion 34 from the lower surface rear end of the control circuit base portion 30.

  The eighth connection wiring 57 electrically connects the first coil pattern 11 and the rectifier 47 via the second connection wiring 51 and the eleventh via portion 46. That is, one end of the eighth connection wiring 57 is connected to the first coil pattern 11, and the other end is connected to the eleventh via portion 46. Specifically, the eighth connection wiring 57 is disposed so as to extend from the right end of the top surface of the first base insulating layer 10 to the approximate center of the top surface of the third joint base portion 35.

  The ninth connection wiring 58 electrically connects the charge controller 48 and the circuit negative terminal 24. That is, one end of the ninth connection wiring 58 is connected to the seventh via portion 42, and the other end is connected to the circuit negative terminal 24. Specifically, the ninth connection wiring 58 is disposed so as to reach from the approximate bottom surface of the control circuit base 30 to the approximate bottom surface of the negative terminal base 31 via the first joint base 33. .

  The tenth connection wiring 59 electrically connects the transformer 49 and the circuit negative terminal 24. That is, one end of the tenth connection wiring 59 is connected to the tenth via portion 45, and the other end is connected to the circuit negative terminal 24. Specifically, the tenth connection wiring 59 is disposed so as to reach from the rear end of the lower surface of the control circuit base portion 30 to the substantially lower surface of the negative electrode terminal base portion 31 via the first joint base portion 33. .

  Examples of the material of the connection wiring pattern 25 include the same material as that of the wiring 17. Preferably, copper is used.

  The thickness of the connection wiring pattern 25 is, for example, 3 μm or more, preferably 10 μm or more, for example, 200 μm or less, preferably 100 μm or less.

  The control element 21 is an element that controls the power flowing through the connection wiring pattern 25 during charging or discharging. The control element 21 includes a rectifier 47, a charge controller 48, and a transformer 49.

  The rectifier 47 is an element (AC / DC converter) that converts alternating current transmitted from the coil member 28 into direct current during charging. The rectifier 47 is disposed on the upper surface of the control circuit base 30 and is disposed on the left side of the control circuit base 30 in plan view. The rectifier 47 is electrically connected to the first connection wiring 50, the second connection wiring 51, the third connection wiring 52, and the fifth connection wiring 54.

  The charging controller 48 is an element that controls the electric power converted into direct current by the rectifier 47 and transmits the electric power to the battery-side circuit positive terminal 22 during charging. The charge controller 48 has a communication function of monitoring the charge state of the secondary battery 2 as necessary to generate a communication signal and transmitting it to a power transmission device 81 (described later). The charging controller 48 is disposed on the upper surface of the control circuit base 30 and is disposed at substantially the center of the control circuit base 30 in plan view. The charge controller 48 is electrically connected to the third connection wiring 52, the fourth connection wiring 53, and the ninth connection wiring 58.

  The transformer 49 is an element for adjusting the voltage from the secondary battery 2 during discharging. The transformer 49 is disposed on the upper surface of the control circuit base 30 and is disposed on the rear side of the control circuit base 30 in plan view. The transformer 49 is electrically connected to the sixth connection wiring 55 and the seventh connection wiring 56.

  The third cover insulating layer 26 is disposed below the second base insulating layer 20 so as to correspond to the connection wiring pattern 25. Specifically, the third cover insulating layer 26 covers the connection wiring pattern 25 and the via portions (36 to 46), and exposes the battery side circuit positive terminal 22, the external circuit positive terminal 23, and the circuit negative terminal 24. In this way, it is disposed on the lower surface of the second insulating base layer 20 (see FIG. 5).

  The material and thickness for forming the third insulating cover layer 26 are the same as the material and thickness of the first insulating base layer 10.

  Such a substrate 3 with a coil can be manufactured, for example, by integrally manufacturing a coil member 28 and a circuit board 29 excluding the control element 21 and then mounting the control element 21 on the circuit board 29. it can.

  Specifically, the first coil pattern 11 and the connection wiring pattern 25 are formed on the upper surface of the base insulating layer (10, 20) by the subtractive method or the additive method, and the second coil pattern is formed on the lower surface of the base insulating layer. 12, a connection wiring pattern 25, a battery side circuit positive terminal 22 and an external circuit positive terminal 23 are formed. At this time, the via portions (16, 36 to 46) and the circuit negative terminal 24 are also formed at the same time.

  Next, the first coil cover insulating layer 13 is formed on the upper surface of the first base insulating layer 10 so as to cover the first coil pattern 11. The second coil cover insulating layer 14 is formed on the lower surface of the second base insulating layer 20 so as to cover the second coil pattern 12. Further, the third cover insulating layer 26 is formed so as to cover the connection wiring pattern 25 and the via portions 36 to 46 and to expose the battery side circuit positive terminal 22, the external circuit positive terminal 23, and the circuit negative terminal 24. To do.

  Next, on the upper surface of the control circuit base portion 30, the control element 21 (rectifier 47, charge controller 48 and transformer 49) is mounted on the corresponding base via portions 36 to 45 via solder or the like. Thereby, the control element 21 of the circuit board 29 is electrically connected to the first coil pattern 11 and the second coil pattern 12 of the coil member 28 via the connection wiring pattern 25.

  In the circuit board 29, the control circuit base portion 30, the control element 21, the battery side circuit positive terminal 22, the connection wiring pattern 25, and the third cover insulating layer 26 disposed on the upper and lower surfaces thereof, To do. The negative terminal base 31, the connection wiring pattern 25 and the third cover insulating layer 26 disposed on the lower surface thereof, and the circuit negative terminal 24 are referred to as a negative terminal 67. The positive terminal base portion 32 and the external circuit positive terminal 23, the connection wiring pattern 25, and the third cover insulating layer 26 disposed on the lower surface thereof are referred to as a positive terminal portion 68.

(Magnetic sheet)
As shown in FIG. 6, the magnetic sheet 4 has a substantially circular flat plate shape in plan view, and is formed to have substantially the same shape as the coil member 28 in plan view.

  The magnetic sheet 4 is a sheet containing a magnetic material, and examples thereof include a magnetic particle-containing resin sheet and a magnetic material sintered sheet.

  The magnetic particle-containing resin sheet is formed into a sheet shape from a composition containing magnetic particles and a resin component.

  Examples of the magnetic material constituting the magnetic particles include a soft magnetic material and a hard magnetic material, and a soft magnetic material is preferable. Examples of soft magnetic materials include magnetic stainless steel (Fe—Cr—Al—Si alloy), sendust (Fe—Si—Al alloy), permalloy (Fe—Ni alloy), silicon copper (Fe—Cu—Si alloy), Fe-Si alloy, Fe-Si-B (-Cu-Nb) alloy, Fe-Si-Cr-Ni alloy, Fe-Si-Cr alloy, Fe-Si-Al-Ni-Cr alloy, ferrite and the like can be mentioned. .

  Examples of the resin component include rubbery polymers such as butadiene rubber, styrene-butadiene rubber, isoprene rubber, acrylonitrile rubber, polyacrylic acid ester, ethylene-vinyl acetate copolymer, and styrene acrylate copolymer. In addition to the above, as the resin component, for example, a thermosetting resin such as an epoxy resin, a phenol resin, a melamine resin, and a urea resin, for example, polyolefin, polyvinyl acetate, polyvinyl chloride, polystyrene, polyamide, polycarbonate, Examples thereof include thermoplastic resins such as polyethylene terephthalate.

  The magnetic material sintered sheet is formed by sintering the above magnetic material to form a sheet, and examples thereof include a ferrite sheet.

  The thickness of the magnetic sheet 4 is, for example, 10 μm or more, preferably 50 μm or more, and for example, 500 μm or less, preferably 300 μm or less.

(Casing)
As shown in FIGS. 1A-B and FIG. 6, the housing 5 has a substantially cylindrical shape extending in the vertical direction, and integrally includes a cylindrical portion 70 and an upper portion 71.

  The cylindrical portion 70 has a cylindrical shape that opens upward and downward.

  A joint opening 72 is formed on the front side surface of the cylindrical portion 70. As shown in FIG. 1A, the joint opening 72 is formed so that the first joint base portion 33 can be disposed outside the housing 5 when the coiled substrate 3 and the magnetic sheet 4 are accommodated in the housing 5. Has been. Specifically, as shown in FIG. 5, the joint opening 72 is cut out in a substantially rectangular shape in a side view from the lower end to the upper end of the front side surface.

  The upper part 71 has an annular shape. The outer peripheral edge of the upper portion 71 is continuous with the upper end edge of the cylindrical portion 70.

  A terminal opening 73 having a substantially circular shape in plan view is formed in the upper portion 71. The circle defining the terminal opening 73 is concentric with the circle defining the outer peripheral edge of the upper portion 71. The terminal opening 73 is formed to have substantially the same shape as the external circuit positive electrode terminal 23.

(Insulating adhesive layer)
The insulating adhesive layer 6 has a substantially circular sheet shape in plan view. The insulating adhesive layer 6 is formed to have substantially the same shape as the magnetic sheet 4 in plan view.

  The insulating adhesive layer 6 is formed from an insulating adhesive. As an insulating adhesive, the adhesive mentioned later with the insulating resin fixing | fixed part 8 is mentioned, Preferably, a pressure sensitive adhesive is mentioned from a viewpoint that an assembly is easy.

  The thickness of the insulating adhesive layer 6 is, for example, 5 μm or more, preferably 10 μm or more, for example, 200 μm or less, preferably 100 μm or less.

(Conductive bonding layer)
The conductive bonding layer 7 includes a first conductive bonding layer 7A and a second conductive bonding layer 7B.

  The first conductive bonding layer 7A and the second conductive bonding layer 7B each have a substantially circular sheet shape in plan view, and are formed to have substantially the same shape as the control circuit portion 66 in plan view. Has been.

  The conductive bonding layer 7 is made of, for example, a conductive adhesive or solder.

  The conductive adhesive contains an adhesive resin and conductive particles.

  Examples of the adhesive resin include thermosetting resins such as epoxy resins, silicone resins, urethane resins, and polyimide resins, and thermoplastic resins such as acrylic resins, polyolefin resins, polyvinyl chloride resins, and styrene butadiene rubbers. It is done.

  Examples of the conductive particles include metal particles such as copper, silver, gold, nickel, and alloys thereof. Further, the conductive particles may be metal-coated resin particles obtained by coating the above metal with resin particles.

  The thicknesses of the first conductive bonding layer 7A and the second conductive bonding layer 7B are, for example, 20 μm or more, preferably 30 μm or more, for example, 200 μm or less, preferably 150 μm or less.

(Insulating resin fixing part)
The insulating resin fixing portion 8 has a substantially circular shape in plan view, is filled in the housing 5, and is formed to have substantially the same shape as the inner peripheral edge of the cylindrical portion 70 of the housing 5. The insulating resin fixing portion 8 is formed from an insulating adhesive.

  Examples of the insulating adhesive include a moisture curable adhesive, a thermosetting adhesive (thermosetting adhesive), a two-component mixed adhesive, and a pressure sensitive adhesive.

  Examples of moisture curable adhesives include silicone moisture curable adhesives, urethane moisture curable adhesives, and cyanoacrylate moisture curable adhesives.

  Examples of the thermosetting adhesive include an epoxy thermosetting adhesive and a phenol thermosetting adhesive.

  Examples of the two-component mixed adhesive include an epoxy-based two-component mixed adhesive, an acrylic two-component mixed adhesive, and a urea-based two-component mixed adhesive.

  Examples of the pressure-sensitive adhesive include acrylic pressure-sensitive adhesives and silicone-based pressure sensitive adhesives.

  The insulating adhesive is preferably a moisture curable adhesive or a thermosetting adhesive from the viewpoint of filling into the housing 5, uniform adhesiveness, etc. More preferably, the thermal load is reduced. From this point of view, a moisture curable adhesive is mentioned, and a silicone moisture curable adhesive is particularly preferred.

(Assembling the battery pack)
A first embodiment of assembly (manufacture) of the battery pack of the present invention will be described with reference to FIGS. The assembly of the battery pack 1 includes, for example, a preparation process, a housing process, and a filling process.

[Preparation process]
In the preparation step, the secondary battery 2, the coiled substrate 3, the magnetic sheet 4, and the housing 5 are prepared as members. An insulating adhesive and a conductive adhesive are also prepared.

[Containment process]
In the housing step, the coiled substrate 3 and the magnetic sheet 4 are housed in a space 75 where the secondary battery 2 and the housing 5 are partitioned. That is, the coiled substrate 3, the control circuit portion 66, the positive terminal portion 68, the second joint base portion 34, the third joint base portion 35 and the magnetic sheet 4 are accommodated in the space 75, while the negative terminal portion 67 and The first joint base portion 33 is disposed outside the space 75.

  (1) Specifically, first, as shown in FIG. 6, the coiled substrate 3 (see FIGS. 4A and 4B) is bent so that it can be accommodated in the housing 5. That is, the positive terminal portion 68, the control circuit portion 66, the second joint base portion 34, and the third joint base portion 35 are bent so that they can be accommodated in the housing 5.

  Specifically, in the substrate 3 with the coil, the two first bent portions 60 of the first joint base portion 33 are bent at right angles (mountain folds) to the lower side, and the negative terminal base portion 31 is controlled by the control circuit. It arrange | positions under the base part 30. FIG. In addition, the two third bent portions 62 of the third joint base portion 35 are bent upward at right angles (valley folds), and the coil member 28 is disposed above the control circuit base portion 30. Next, the two second bent portions 61 of the second joint base portion 34 are bent upward at right angles (valley folds), and the positive terminal base portion 32 is placed above the control circuit base portion 30 and the coil member 28. Deploy.

  As a result, as shown in FIG. 6, a bending circuit 69 is obtained in which the positive terminal portion 68, the coil member 28, the control circuit portion 66, and the negative terminal portion 67 are sequentially spaced from each other.

  In the bending circuit 69, the battery side of the external circuit positive terminal 23 of the positive terminal 68, the second coil pattern 12 of the coil member 28, the control element 21 of the control circuit 66, and the circuit negative terminal 24 of the negative terminal 67. The surface 24B is disposed so as to face upward. Further, the first coil pattern 11 of the coil member 28, the connection wiring pattern 25 of the control circuit section 66, the battery side circuit positive terminal 22, and the terminal side surface 24A of the circuit negative terminal 24 are directed downward. Be placed. That is, the positive electrode terminal portion 68, the coil member 28, and the negative electrode terminal portion 67 in the state of the battery pack shown in FIG. 1A are respectively the positive electrode terminal portion 68, the coil member 28, and the negative electrode terminal in the state of development shown in FIGS. The vertical direction is reversed with respect to the portion 67. Further, the positive electrode terminal portion 68 and the negative electrode terminal portion 67 are also reversed in the front-rear direction, and the coil member 28 is also reversed in the left-right direction.

  The positive electrode terminal portion 68, the coil member 28, the control circuit portion 66, and the negative electrode terminal portion 67 are arranged so as to be arranged in parallel in the plane direction (front-rear direction or left-right direction) with an interval in the vertical direction. The joint base part 33, the second joint base part 34, and the third joint base part 35 are arranged so as to extend in the vertical direction.

  (2) Next, as shown in FIG. 6, the secondary battery 2 is disposed between the control circuit portion 66 and the negative terminal portion 67.

  At this time, the control circuit portion 66 of the bending circuit 69 is disposed on the upper side of the battery positive terminal 18 of the secondary battery 2 via the first conductive bonding layer 7A, and the negative terminal portion 67 of the bending circuit 69 is disposed. The battery is disposed below the battery negative terminal 19 of the secondary battery 2 via the second conductive bonding layer 7B. That is, the first conductive bonding layer 7A is disposed on the battery positive electrode terminal 18 (upper surface) of the secondary battery 2, and then the control circuit unit 66 is connected to the battery-side circuit positive electrode terminal 22 with the first conductive bonding layer 7A. It arrange | positions on the upper surface of 7 A of 1st electroconductive joining layers so that it may contact. Further, the second conductive bonding layer 7B is disposed on the battery negative electrode terminal 19 (lower surface) of the secondary battery 2, and subsequently, the negative electrode terminal portion 67 and the battery side surface 24B of the negative electrode terminal portion 67 are second conductive. It arrange | positions on the lower surface of the 2nd electroconductive joining layer 7B so that the joining layer 7B may be contacted. Thereby, the control circuit part 66 and the negative electrode terminal part 67 are fixed to the secondary battery 2 via each conductive bonding layer 7.

  Examples of the arrangement of the conductive bonding layer 7 include a method of applying a liquid conductive adhesive, a method of applying a sheet made of a conductive adhesive (such as a conductive adhesive tape), and soldering.

  At this time, although not shown, the control circuit portion 66 and the negative electrode terminal portion 67 may be pressed firmly against the secondary battery 2 by using a pressing jig or the like to firmly fix them.

  (3) Next, the magnetic sheet 4 is disposed on the coil member 28.

  Specifically, the magnetic sheet 4 is disposed below the coil member 28 of the bending circuit 69 with the insulating adhesive layer 6 interposed therebetween. That is, the insulating adhesive layer 6 and the magnetic sheet 4 are sequentially arranged on the surface (the lower surface in FIG. 6) of the coil member 28 on the first coil pattern 11 side. Thereby, the magnetic sheet 4 is fixed to the coil member 28 via the insulating adhesive layer 6.

  Examples of the arrangement of the insulating adhesive layer 6 include a method of applying a liquid insulating adhesive and a method of applying a sheet (such as an adhesive tape) made of an insulating adhesive.

  (4) Next, the housing 5 is disposed on the secondary battery 2. That is, the casing 5 is disposed on the upper surface of the secondary battery 2, and the folding circuit 69 in which the magnetic sheet 4 and the like are disposed is accommodated in the casing 5.

  Specifically, the housing 5 is arranged on the upper surface of the secondary battery 2 so that the lower end edge of the cylindrical portion 70 is in contact with the peripheral edge of the upper surface (battery positive terminal 18) of the secondary battery 2. At this time, the positive terminal portion 68, the coil member 28, the control circuit portion 66, and the second joint base portion are exposed so that the first joint base portion 33 and the negative electrode terminal portion 67 are exposed to the outside from the joint opening 72 of the cylindrical portion 70. 34, the third joint base portion 35, the first conductive bonding layer 7 </ b> A, and the insulating adhesive layer 6 are accommodated in the housing 5. Further, the upper surface of the battery positive terminal 18 is in contact with the lower surface of the upper portion 71 of the housing 5.

  As a result, as shown in FIG. 7A, the first intermediate 100 is obtained. In the first intermediate 100, a space 75 defined by the upper surface of the secondary battery 2 and the inner peripheral surface of the housing 5 disposed on the upper surface of the secondary battery 2 is formed. In the space 75, a part of the substrate 3 with a coil (the positive terminal portion 68, the coil member 28, the control circuit portion 66, the second joint base portion 34, the third joint base portion 35), the first conductive bonding layer 7A, And the insulating contact bonding layer 6 is accommodated.

  At this time, although not shown, the positive terminal portion 68 may be fixed to the upper portion 71 of the housing 5 with an insulating adhesive.

[Filling process]
In the filling process, as shown in FIGS. 7A to 7C, the space 75 is filled with the insulating resin fixing portion 8.

  (1) First, as shown by the phantom line in FIG. 7A, the vertical direction of the first intermediate body 100 is fixed with the jig 101. That is, the secondary battery 2 and the housing 5 are fixed with the jig 101.

  The jig 101 includes a lower side portion 102 (battery side jig) and an upper side portion 103 (housing jig).

  A lower concave portion 104 is formed on the upper surface of the lower portion 102, and an upper concave portion 105 corresponding to the lower concave portion 104 is formed on the lower surface of the upper portion 103. The lower concave portion 104 and the upper concave portion 105 define the accommodating portion 106 that accommodates the first intermediate body 100. The vertical length (recessed portion length) of the housing portion 106 is substantially the same as the vertical length of the first intermediate body 100 (and thus the battery pack 1).

  By contacting the upper surface of the lower side portion 102 and the lower surface of the upper side portion 103, the first intermediate body 100 is accommodated in the accommodating portion 106 while being formed in the accommodating portion 106. Thereby, the vertical direction of the first intermediate body 100 is fixed by the jig 101.

  (2) Next, as shown in FIG. 7B, the insulating resin fixing portion 8 is filled into the space 75 of the first intermediate body 100. That is, an insulating adhesive is injected into the space 75 of the first intermediate 100 and solidified.

  First, the first intermediate body 100 is arranged so that the joint opening 72 faces upward. Specifically, the first intermediate body 100 is rotated together with the jig 101 so that the one joint opening 72 is on the upper side.

  Subsequently, after injecting the liquid insulating adhesive into the space 75 of the first intermediate body 100 through the joint opening 72, the insulating adhesive is solidified (cured).

  The solidification of the insulating adhesive is determined according to the type. For example, when an insulating thermosetting adhesive is used, heating is performed, and when a moisture curable insulating adhesive is used, it is left or heated as necessary to provide a two-component curable insulating property. When the adhesive is used, the two liquids (A liquid / B liquid) are injected and left to stand.

  Thereby, as shown in FIG. 7C, the insulating resin fixing portion 8 is arranged (filled) in the space 75, and the battery pack 1 is obtained.

(Battery pack)
In the battery pack 1, as shown in FIGS. 1A to 3B, a coiled substrate 3, a magnetic sheet 4, a housing 5, an insulating adhesive layer 6, a first conductive bonding layer 7 </ b> A and an insulating material are disposed on the upper side of the secondary battery 2. A conductive resin fixing portion 8 is disposed, and a substrate 3 with a coil, a magnetic sheet 4, an insulating adhesive layer 6, a first conductive bonding layer 7A, and an insulating resin fixing portion 8 are accommodated in a housing 5. ing. Specifically, in the housing 5, the positive terminal portion 68, the coil member 28, the insulating adhesive layer 6, the magnetic sheet 4, the control circuit portion 66, and the first conductive bonding layer 7 </ b> A are sequentially arranged from the top. Has been placed. These members are embedded in the insulating resin fixing portion 8, that is, these members are filled with the insulating resin fixing portion 8 in the space 75 between the housing 5 and the secondary battery 2. Further, the second conductive bonding layer 7 </ b> B and the negative electrode terminal portion 67 are disposed below the secondary battery 2.

  The positive terminal portion 68 is disposed so that the external circuit positive terminal 23 is positioned on the upper side. In the positive electrode terminal portion 68, the external circuit positive electrode terminal 23 is arranged above the coil member 28 and the secondary battery 2 so as to overlap the coil member 28 and the secondary battery 2 when projected in the vertical direction. Yes. Further, the external circuit positive terminal 23 is exposed from the terminal opening 73 of the housing 5.

  The coil member 28 is disposed below the positive electrode terminal portion 68 with a space from the positive electrode terminal portion 68. The first coil pattern 11 is disposed on the lower side, and the second coil pattern 12 is disposed on the upper side.

  The insulating adhesive layer 6 is disposed on the lower side of the coil member 28 so that the upper surface thereof is in contact with the lower surface of the coil member 28 and the lower surface thereof is in contact with the upper surface of the magnetic sheet 4.

  The magnetic sheet 4 is disposed below the insulating adhesive layer 6 so that the upper surface thereof is in contact with the lower surface of the insulating adhesive layer 6.

  The control circuit unit 66 is disposed below the magnetic sheet 4. The control circuit unit 66 is arranged such that the control element 21 is located on the upper side, and the battery side circuit positive terminal 22 and the connection wiring pattern 25 are located on the lower side.

  The first conductive bonding layer 7 </ b> A is disposed below the control circuit unit 66 so that the upper surface thereof is in contact with the lower surface of the control circuit unit 66 and the lower surface thereof is in contact with the upper surface of the secondary battery 2.

  As for the secondary battery 2, the center part of the upper surface (battery positive terminal 18) is in contact with the lower surface of the first conductive bonding layer 7A, and the center part of the lower surface (battery negative terminal 19) is the second conductive bonding layer 7B. Is disposed below the first conductive bonding layer 7A so as to be in contact with the upper surface of the first conductive bonding layer 7A. Thereby, the battery positive terminal 18 is electrically connected to the battery side circuit positive terminal 22 of the circuit board 29 via the first conductive bonding layer 7A, and the battery negative terminal 19 is connected to the second conductive bonding layer. The circuit negative electrode terminal 24 of the circuit board 29 is electrically connected via 7B. Further, the secondary battery 2 is disposed on the lower side of the casing 5 so that the peripheral edge of the upper surface thereof is in contact with the lower end edge of the casing 5 and the lower surface of the first conductive bonding layer 7A. The peripheral side surface of the secondary battery 2 is exposed from the housing 5.

  The insulating resin fixing portion 8 is disposed in a space 75 in which the housing 5 and the secondary battery 2 are partitioned. The insulating resin fixing portion 8 has a substantially circular shape in plan view. The insulating resin fixing portion 8 is included in the secondary battery 2 when projected in the vertical direction. Specifically, the insulating resin fixing portion 8 has a shape slightly smaller than that of the secondary battery 2 in plan view. The insulating resin fixing portion 8 includes the coil member 28, the control circuit portion 66, and the positive terminal portion 68 when projected in the vertical direction. Specifically, the insulating resin fixing portion 8 has a shape that is substantially the same as or larger than each of the coil member 28, the control circuit portion 66, and the positive electrode terminal portion 68 in plan view, and more specifically. Has a shape larger than those.

  The insulating resin fixing portion 8 is in contact with the secondary battery 2, the coiled substrate 3, the magnetic sheet 4, and the housing 5. Specifically, the insulating resin fixing portion 8 is integrally provided with a first insulating resin fixing portion 8A and a second insulating resin fixing portion 8B disposed on the upper side thereof.

  The first insulating resin fixing portion 8 </ b> A is disposed between the coil member 28 and the control circuit portion 66. The upper surface of the first insulating resin fixing portion 8A is in contact with the lower surface of the magnetic sheet 4 and the lower surface of the second insulating resin fixing portion 8B, and the lower surface of the first insulating resin fixing portion 8A is the upper surface of the control circuit portion 66. And it contacts the upper surface of the secondary battery 2. Further, the side surface of the first insulating resin fixing portion 8 </ b> A is in contact with the inner peripheral surface of the cylindrical portion 70. Thereby, the first insulating resin fixing portion 8A fixes the magnetic sheet 4, the control circuit portion 66, the secondary battery 2, and the housing 5, and consequently the coil member 28, the control circuit portion 66, and the second The secondary battery 2 and the housing 5 are fixed.

  The second insulating resin fixing portion 8 </ b> B is disposed between the positive terminal portion 68 and the coil member 28. The upper surface of the second insulating resin fixing portion 8B is in contact with the lower surface of the positive terminal portion 68 and the lower surface of the upper portion 71 of the housing 5, and the lower surface of the second insulating resin fixing portion 8B is the upper surface of the coil member 28 and the second upper surface. 1 It contacts the upper surface of the insulating resin fixing portion 8A. Further, the side surface of the second insulating resin fixing portion 8 </ b> B is in contact with the inner peripheral surface of the cylindrical portion 70. The second insulating resin fixing portion 8B is formed to have substantially the same shape as the first insulating resin fixing portion 8A in plan view. Thereby, the second insulating resin fixing portion 8B fixes the positive terminal portion 68, the coil member 28, and the housing 5.

  The insulating resin fixing portion 8 fills the entire space 75 defined by the inner peripheral surface of the housing 5 and the upper surface of the secondary battery 2. That is, in the space 75, there is substantially no gap (air layer: space in which no member exists).

Maximum thickness T ₁ of the first insulating resin fixing portion 8A (that is, the vertical distance between the uppermost end and the lowermost end of the first insulating resin fixing portion 8A) and the maximum thickness of the second insulating resin fixing portion 8B T ₂ (that is, the vertical distance between the uppermost end and the lowermost end of the second insulating resin fixing portion 8B) is, for example, 0.3 mm or more, preferably 0.5 mm or more, for example, 2 mm or less. Preferably, it is 1.5 mm or less.

Maximum thickness _{T 3} of the insulating resin fixing part 8, for example, 0.6 mm or more, preferably not less 1mm or more, for example, 4 mm or less, preferably 3mm or less.

  The second conductive bonding layer 7 </ b> B is disposed on the lower side of the secondary battery 2 such that the upper surface thereof is in contact with the lower surface of the secondary battery 2 (battery negative electrode terminal 19) and the lower surface thereof is in contact with the upper surface of the negative electrode terminal portion 67. Is arranged.

  The negative electrode terminal portion 67 is disposed on the lower side of the secondary battery 2 so that the upper surface of the negative electrode terminal portion 67 is in contact with the lower surface of the second conductive bonding layer 7B. The negative terminal portion 67 is arranged so that the battery side surface 24B of the circuit negative terminal 24 is located on the upper side and the terminal side surface 24A is located on the lower side.

  The first joint base portion 33 of the coiled substrate 3 is disposed so as to pass through the joint opening 72 in the middle in the vertical direction between the negative electrode terminal portion 67 and the control circuit portion 66. The first joint base portion 33 is disposed so as to contact the front peripheral side surface of the secondary battery 2.

  The second joint base portion 34 is disposed so as to contact the inner surface of the rear end of the cylindrical portion 70 in the middle in the vertical direction between the positive terminal portion 68 and the control circuit portion 66.

  The third joint base portion 35 is disposed so as to contact the inner surface of the left end of the cylindrical portion 70 in the middle of the coil member 28 and the control circuit portion 66 in the vertical direction.

3. Wireless Power Transmission System A first embodiment of a wireless power transmission system of the present invention will be described with reference to FIG.

  The wireless power transmission system 80 includes the battery pack 1 and a power transmission device 81.

  The power transmission device 81 includes a power transmission coil 82, an oscillation circuit 83, and external power supply connection means 84.

  Examples of the power transmission coil 82 include the coil member 28 described above, for example, a wound coil formed by winding a wire such as a copper wire.

  The oscillation circuit 83 is a circuit that generates power having a frequency of 1 MHz to 10 MHz (preferably 1 MHz to 5 MHz), for example. As the oscillation circuit 83, for example, any circuit of an LC oscillation circuit method, a CR oscillation circuit method, a crystal oscillation circuit method, and a switching circuit method may be used.

  The external power supply connecting means 84 is means that can be connected to the external power supply 85, and examples thereof include an AC adapter and a USB terminal.

  Power transmission by a magnetic field between the coil member 28 (power receiving coil) and the power transmission coil 82 may be either a magnetic field resonance method or an electromagnetic induction method. Preferably, the magnetic field resonance method is used from the viewpoint that the transmission distance can be increased and that the highly efficient power transmission is possible even with respect to the axial deviation of the coil.

3. Charging / discharging mechanism (during charging)
The power supplied to the oscillation circuit 83 by the external power supply 85 is converted into power having a frequency of 1 MHz to 10 MHz, for example, and a magnetic field is generated from the power transmission coil 82 by the power of that frequency. By the magnetic field generated by the power transmission coil 82, the coil member 28 (power reception coil) receives power at that frequency.

  The received power is converted into direct current by the control element 21 and controlled to a voltage not higher than a predetermined value, and is supplied to the secondary battery 2. That is, for example, alternating current of 1 MHz or more and 10 MHz or more is generated in the coil member 28, and the alternating current is converted into direct current by the rectifier 47 via the first connection wiring 50 and the second connection wiring 51. Then, the direct current reaches the charging controller 48 via the third connection wiring 52. Thereafter, the direct current controlled by the charge controller 48 reaches the battery positive terminal 18 of the secondary battery 2 via the fourth connection wiring 53 and the battery side circuit positive terminal 22. On the other hand, on the negative electrode side, the current reaches the charge controller 48 from the battery negative electrode terminal 19 (ground) of the secondary battery 2 via the circuit negative electrode terminal 24 and the ninth connection wiring 58.

  Thereby, the secondary battery 2 is charged.

(During discharge)
A current having a predetermined voltage (for example, 3.7 V) is discharged from the battery positive terminal 18 of the secondary battery 2, and the current is transformed via the battery side circuit positive terminal 22 and the sixth connection wiring 55. The container 49 is reached. Then, a current having a predetermined voltage is transformed to a desired voltage (for example, 1.2 V) by the transformer 49. Thereafter, the transformed current passes through the seventh connection wiring 56 and the external circuit positive terminal 23, and is connected to a positive terminal (for example, an external apparatus positive terminal 96 to be described later) of an external electronic apparatus (for example, a hearing aid 90 to be described later). ). On the other hand, on the negative electrode side, current reaches the battery negative electrode terminal 19 (ground) from the negative electrode terminal of the external electronic device (for example, an external device negative electrode terminal 97 described later) via the circuit negative electrode terminal 24, and the circuit. The current reaches the transformer 49 via the negative terminal 24 and the tenth connection wiring 59.

  Thereby, the secondary battery 2 is discharged, and an external electronic device is driven.

4). Applications The battery pack 1 and the wireless power transmission system 80 can be widely used in electronic devices using conventional secondary batteries and primary batteries. Examples of such electronic devices include wearable terminals such as hearing aids, smart glasses, and smart watches, for example, speakers, for example, medical devices.

  The battery pack 1 includes a first insulating resin fixing portion 8A that fixes the coil member 28 and the control circuit portion 66 of the circuit board 29. For this reason, even when a pressure from the upper side to the lower side is applied to the coil member 28, the vertical positions of the coil member 28 and the control circuit unit 66 hardly change, and the strength is improved. Therefore, when the terminal of an electronic device contacts from the upper side of the battery pack 1, it suppresses that the coil member 28 dents below with respect to the pressure which the terminal of an electronic device pushes the coil member 28 downward. be able to. As a result, damage to the battery pack 1 can be suppressed.

  In particular, the battery pack 1 further includes a second insulating resin fixing portion 8B that fixes the coil member 28 and the positive electrode terminal portion 68 of the circuit board 29. For this reason, even when a pressure from the upper side to the lower side is applied to the positive electrode terminal portion 68, the vertical positions of the coil member 28 and the positive electrode terminal portion 68 are not easily changed, and the strength is further improved. Yes. Therefore, when the terminal of the electronic device is contacted from the upper side of the battery pack 1, the positive terminal portion 68 is excessively recessed downward with respect to the pressure with which the terminal of the electronic device pushes the positive terminal portion 68 downward. This can be suppressed. As a result, it is possible to suppress poor contact between the positive electrode terminal portion 68 and the terminal of the battery device, that is, a decrease in connectivity with the electronic device.

  In the battery pack 1, the coil member 28 and the substrate 3 with the coil are disposed above the secondary battery 2. For this reason, it is not necessary to arrange protective members such as a housing for protecting the coil member 28 on the side surface and the lower side of the secondary battery 2. Therefore, the battery pack 1 can be downsized.

  Moreover, in this battery pack 1, the insulating resin fixing | fixed part 8 contains the coil member 28, when it projects on an up-down direction. That is, the insulating resin fixing portion 8 has substantially the same shape as the coil member 28 or a shape larger than that in the plan view. For this reason, the coil member 28 can be stably fixed over the entire range of the coil member 28 in plan view. Therefore, the strength of the battery pack can be improved over a wide range in plan view. As a result, even if the terminal of the electronic device is brought into contact with the positive electrode terminal portion 68 in the wide range of the positive electrode terminal portion 68, the connectivity with the electronic device can be reduced and the battery pack 1 can be prevented from being damaged.

  In the battery pack 1, the coil member 28 is a sheet coil that includes the first base insulating layer 10 and a first coil pattern and a second coil pattern disposed on the upper surface or the lower surface of the first base insulating layer 10. is there. That is, since the coil member 28 is a sheet coil, the coil member 28 is thinner in the vertical direction than the wound coil in which the copper wire is wound in the vertical direction. Therefore, further downsizing is possible. Moreover, since the coil member is provided with the coil pattern, it is less likely to be deformed with respect to the pressure in the vertical direction as compared with the wound coil. Therefore, it is excellent in strength.

  The battery pack 1 further includes a housing 5 that is disposed on the upper side of the battery pack 1 and accommodates the coil member 28 and the circuit board 29. For this reason, the coil member 28 and the circuit board 29 can be protected against an external impact.

  The wireless power transmission system 80 includes the battery pack 1 and a power transmission device 81 including a power transmission coil 82. For this reason, since electric power can be transmitted to the secondary battery 2 of the battery pack 1 wirelessly, the secondary battery 2 can be wirelessly charged.

  In the wireless power transmission system 80, the power transmission device 81 transmits power having a frequency of 1 MHz to 10 MHz. For this reason, the battery pack 1 can receive power with high frequency power of 1 MHz to 10 MHz, and the secondary battery 2 can be charged with high efficiency.

5. hearing aid
Next, a first embodiment of the hearing aid of the present invention will be described with reference to FIGS. 9A to 9C.

  The hearing aid 90 includes a battery pack 1, a hearing aid housing 91, a microphone unit 92, an amplification unit 93, a speaker unit 94, an external device positive terminal 96 and an external device negative terminal 97.

  As the transformer 49 mounted on the battery pack 1 used for the hearing aid 90, for example, a transformer capable of transforming to 1.2V is used.

  The hearing aid housing 91 includes a housing body 91A and an opening / closing mechanism 91B.

  The casing main body 91A accommodates therein a microphone unit 92, an amplifying unit 93, a speaker unit 94, an external device positive terminal 96, and an external device negative terminal 97.

  The external device positive electrode terminal 96 and the external device negative electrode terminal 97 are arranged to face each other with a space therebetween on the lower side of the housing main body 91A. The distance between the tip of the external device positive electrode terminal 96 (contact point with the external circuit positive electrode terminal 23) and the tip of the external device negative electrode terminal 97 (contact point with the battery negative electrode terminal 19) is the vertical length of the battery pack 1. (See FIGS. 1A and 6A).

  The microphone unit 92, the amplifying unit 93, and the speaker unit 94 are disposed inside the hearing aid housing 91, and these are electrically connected to the external device positive terminal 96 and the external device negative terminal 97.

  The opening / closing mechanism 91B is disposed at the lower end of the housing body 91A. The opening / closing mechanism 91B is a curved plate member having an arcuate side view and a U-shaped front view, and one end (fixed end) 98 of the opening / closing mechanism 91B is located at the lower end of the housing body 91A via a hinge part. And is rotatably fixed. The opening / closing mechanism portion 91 </ b> B forms a housing portion 95 together with a space between the external device positive electrode terminal 96 and the external device negative electrode terminal 97.

  The accommodating portion 95 has a space that can accommodate the battery pack 1. The accommodating portion 95 is configured to selectively accommodate the battery pack 1 or a commercially available primary battery (preferably a button-type primary battery).

  The accommodating portion 95 is accommodated inside the hearing aid housing 91 or exposed to the outside by rotating the opening / closing mechanism portion 91B with the fixed end portion 98 as a fulcrum. Specifically, as shown in FIG. 9A, the accommodation portion 95 is externally moved by moving the free end portion 99 (the other end opposite to the fixed end portion 98) of the opening / closing mechanism portion 91B downward. Exposed (open state). On the other hand, as shown in FIG. 9B, by moving the free end portion 99 upward, the accommodating portion 95 is accommodated inside the hearing aid housing 91 (closed state).

  When the opening / closing mechanism 91B is in the open state, the upper portion of the housing 95 is opened, and the battery pack 1 can be replaced. On the other hand, when the opening / closing mechanism 91 </ b> B is in the closed state, the size and shape of the inside of the housing portion 95 are substantially the same as the size and shape of the battery pack 1.

  The battery pack 1 is accommodated in the accommodating portion 95. Specifically, as shown in FIG. 9B, the battery pack 1 has an external device positive terminal 96 that passes through the terminal opening 73 and the external circuit positive terminal when the opening / closing mechanism 91B is in the closed state. 23, and the external device negative electrode terminal 97 is disposed inside the accommodating portion 95 so as to contact the terminal side surface 24 </ b> A of the circuit negative electrode terminal 24.

  The hearing aid 90 includes the battery pack 1, a hearing aid housing 91, a microphone unit 92, an amplification unit 93, and a speaker unit 94. Therefore, it is possible to reduce the size of the hearing aid 90, particularly the size of the housing portion 95. Moreover, since the strength of the battery pack 1 is excellent, when the hearing aid 90 is accommodated in the accommodating portion 95 of the battery pack 1 and the external device positive electrode terminal 96 is brought into contact with the external circuit positive electrode terminal 23, the external side The circuit board 29 such as the circuit positive terminal 23 and the coil member 28 are not easily recessed, and the durability of the hearing aid 90 is excellent.

  In this hearing aid 90, the housing part 95 can also house the primary battery. Therefore, since it can be driven using either a primary battery or a secondary battery, it is excellent in convenience.

6). Modified Examples of First Embodiment In the following modified examples, the same members and processes as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Moreover, each modification can be combined suitably. Furthermore, each modification can produce the same effects as those of the embodiment, unless otherwise specified.

  (1) In the embodiment shown in FIGS. 1A and 4A-B, the coiled substrate 3 includes one coil member 28. For example, as shown in FIGS. 10 and 11A, the coiled substrate 3 ( The bending circuit 69) may include a plurality (two) of coil members 28 (28A, 28B).

  In this embodiment, as shown in FIG. 11A, in the developed view, the plurality of coil members 28 are disposed adjacent to each other with a space between the positive terminal portion 68 and the control circuit portion 66. On the other hand, as shown in FIG. 10, in the battery pack 1, the positive electrode terminal portion 68, the plurality of coil members 28 (28 </ b> A, 28 </ b> B), and the control circuit portion 66 are arranged in parallel with each other in this order. Has been placed.

  The insulating resin fixing portion 8 further includes a third insulating resin fixing portion 8C in addition to the first insulating resin fixing portion 8A and the second insulating resin fixing portion 8B. The third insulating resin fixing portion 8C is disposed between the plurality of coil members 28 (28A, 28B). That is, the upper surface of the third insulating resin fixing portion 8C is in contact with the lower surface of the coil member 28B disposed on the upper side, and the lower surface of the third insulating resin fixing portion 8C is the lower surface of the coil member 28A disposed on the lower side. Touch the top surface.

  The axial misalignment between the coil member 28A and the coil member 28B (for example, the distance in the surface direction of the coil via 16) is, for example, 3 mm or less, preferably 2 mm or less, more preferably 1 mm or less.

  Also in the embodiment shown in FIGS. 10A and 11, the same effects as those of the embodiment shown in FIG. 1A are obtained. Moreover, in embodiment shown to FIG. 10A and FIG. 11, since the some coil member 28 is provided, the amount of received electric power increases. In addition, since the third insulating resin fixing portion 8C is disposed between the plurality of coil members 28 (28A, 28B), the plurality of coil members 28 can be moved in the vertical direction even with respect to the pressure in the vertical direction. In other words, it is possible to maintain the arrangement parallel to the surface direction with a gap therebetween, and to suppress a decrease in power reception efficiency (particularly, the L value) due to the axial deviation of the plurality of coil members 28.

  (2) In the embodiment shown in FIGS. 10 and 11A, the substrate 3 with a coil includes a plurality (two) of coil members 28 (28A, 28B), which are independent of the positive terminal portion 68. However, for example, as shown in FIG. 11B, the first coil pattern 11 may be formed on the lower surface of the positive electrode terminal portion 68.

  In this case, the positive terminal portion 68 is also a coil member.

  The embodiment shown in FIG. 11B also has the same operational effects as the embodiment shown in FIGS. 1A and 4A-B. Moreover, in embodiment shown to FIG. 11B, since the some coil member 28 is provided, the amount of received electric power increases. In addition, since the second insulating resin fixing portion 8B disposed between the positive electrode terminal portion 68 (coil member) and the coil member 28 is provided, the positive electrode terminal portion 68 (coil member), the coil member 28, Is capable of maintaining an arrangement that is spaced in the vertical direction and arranged in parallel to the surface direction even with respect to the pressure in the vertical direction, and that the power reception efficiency (particularly, the L value) due to the axial misalignment of the plurality of coil members 28 can be maintained. Can be suppressed.

  (3) In the embodiment shown in FIGS. 1A, 4A-B, and FIG. 5, the coil member 28 includes the first coil pattern 11 and the second coil pattern 12 on both surfaces of the first base insulating layer 10. For example, although not illustrated, the coil member 28 may include a coil pattern (the first coil pattern 11 or the second coil pattern 12) only on one surface of the first base insulating layer 10.

  From the viewpoint of power reception efficiency, the embodiments shown in FIGS. 1A, 4A-B, and FIG. 5 are preferable.

  (4) In the embodiment shown in FIGS. 1A and 4A-B, the battery pack 1 includes the coiled substrate 3 in which the coil member 28 and the circuit substrate 29 are integrally formed. However, the coil member 28 and the circuit board 29 can also be comprised from a separate member.

  In this embodiment, the coil member 28 includes a plurality (two) of terminals for electrical connection with the circuit board 29, and the circuit board 29 includes a plurality of (2 for electrical connection with the coil member 28). Terminal). These terminals are electrically connected and accommodated in the housing 5.

  (5) In the embodiment shown in FIGS. 1A and 3A-B, the coiled substrate 3 is integrally formed on the upper side of the secondary battery 2, and the coil member 28 and the circuit board 29 are integrally formed. Although not shown, a lower coil member and / or a lower circuit board disposed below the secondary battery 2 may be further provided.

  The lower coil member is the same as the coil member 28 arranged on the upper side, and the lower circuit board is the same as the circuit board 29 arranged on the upper side. Each of the lower coil member and / or the lower circuit board is electrically connected to the coiled substrate 3 disposed on the upper side.

 (6) In the embodiment shown in FIGS. 1A and 4A-B, the circuit board 29 includes the rectifier 47, the charge controller 48, and the transformer 49 as the control element 21. The substrate 29 may include an element (for example, an integrated circuit) in which two or three of the rectifier 47, the charge controller 48, and the transformer 49 are combined as one member. In addition, the circuit board 29 can further include other elements such as a capacitor for suppressing noise as the control element 21. The connection wiring pattern 25 and the base via portions 36 to 45 are appropriately changed according to the type and number of the control elements 21. Specifically, for example, when the rectifier 47, the charge controller 48, and the transformer 49 are used as one member (control element 21), the fifth connection wiring 54, the ninth connection wiring 58, and the tenth connection wiring. 59 is used as one connection wiring, and the circuit negative terminal 24 and the control element 21 can be electrically connected through this connection wiring.

  (7) In the embodiment shown in FIGS. 1A and 3A-B, the insulating resin fixing portion 8 fills the entire space 75 defined by the inner peripheral surface of the housing 5 and the upper surface of the secondary battery 2. ing. That is, in the space 75, there is substantially no gap (air layer: space where no member exists) (the actual filling rate described later is 100%).

  For example, although not shown, the insulating resin fixing portion 8 may fill a part of the space 75. That is, a gap may exist inside the space 75.

  In this case, the ratio of the volume of the insulating resin fixing portion 8 to the total volume of the volume of the insulating resin fixing portion 8 and the volume of the gap inside the space 75 (actual filling rate with respect to the space that can be filled) is, for example, 50% or more, preferably 80% or more, and more preferably 90% or more.

  Also in this embodiment, the same operation and effect as the embodiment shown in FIGS. 1A and 3A-B are achieved. Since the insulating resin fixing portion 8 is sufficiently present inside the housing 5, the embodiment shown in FIGS. 1A and 3A-B is preferable from the viewpoint of improving the strength of the battery pack 1 more reliably. Can be mentioned.

  (8) In the embodiment shown in FIGS. 1A and 2, the battery pack 1 includes the magnetic sheet 4 and the insulating adhesive layer 6. For example, although not shown, the battery pack 1 includes the magnetic sheet 4 and the insulating layer. The adhesive layer 6 may not be provided.

  In this embodiment, the upper surface of the second insulating resin fixing portion 8B contacts the lower surface of the coil member 28, whereby the second insulating resin fixing portion 8B directly fixes the coil member 28 and the control circuit portion 66. ing.

  From the viewpoint of power reception efficiency, the battery pack 1 preferably includes a magnetic sheet 4.

  In the embodiment shown in FIGS. 1A and 2, the battery pack 1 includes the insulating adhesive layer 6. However, for example, although not illustrated, the battery pack 1 may not include the magnetic sheet 4. In this embodiment, the upper surface of the magnetic sheet 4 is in contact with the lower surface of the coil member 28.

  (9) In the embodiment shown in FIG. 1A and FIG. 2, the battery pack 1 includes the conductive bonding layer 7 (7A, 7B). For example, although not shown, the conductive bonding layer 7 (7A, 7B) is provided. ) May not be provided. In this case, the battery positive terminal 18 is directly electrically connected to the battery side circuit positive terminal 22 of the circuit board 29, and the battery negative terminal 19 is connected to the circuit negative terminal 24 of the circuit board 29 via the conductive bonding layer 7B. And have a direct electrical connection.

  (10) In the embodiment shown in FIGS. 1A and 2, the secondary battery 2 used in the battery pack 1 does not include a negative electrode tab and a positive electrode tab. For example, although not shown, the secondary battery 2 is a battery. A positive electrode tab disposed on the upper surface of the positive electrode terminal 18 and / or a negative electrode tab disposed on the lower surface of the battery negative electrode terminal 19 may be provided. That is, the secondary battery 2 may be a battery with a tab. In this embodiment, the secondary battery 2 is electrically connected to the coiled substrate 3 via the positive electrode tab and / or the negative electrode tab.

  (11) In the battery pack manufacturing method shown in FIG. 6, first, after bending the coiled substrate 3, the magnetic sheet 4, the secondary battery 2, and the housing 5 are arranged in this order. It is not limited. For example, although not illustrated, the magnetic sheet 4 and the housing 5 are arranged on the substrate 3 with the coil before bending, and then the substrate 3 with the coil is arranged on the upper surface of the secondary battery 2 and then the substrate 3 with the coil is bent. May be.

Second Embodiment
A second embodiment of the battery pack of the present invention will be described with reference to FIGS. 12A to 14E. In the second embodiment, members similar to those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

1. Battery Pack As shown in FIGS. 12A to 13, the battery pack 1 of the second embodiment includes a secondary battery 2, a substrate 3 with a coil, a magnetic sheet 4, an insulating adhesive layer 6, a conductive bonding layer 7, and An insulating resin fixing portion 8 is provided. Further, the battery pack 1 does not include the housing 5.

  The secondary battery 2, the coiled substrate 3, the magnetic sheet 4, the insulating adhesive layer 6 and the conductive bonding layer 7 of the second embodiment are the same as those of the first embodiment.

  The insulating resin fixing portion 8 has a substantially circular shape in plan view. The insulating resin fixing portion 8 is formed so as to coincide with the outer shape of the secondary battery 2 when projected in the vertical direction. Specifically, the insulating resin fixing portion 8 is formed to have substantially the same shape as the outer shape of the secondary battery 2 in plan view.

  The insulating resin fixing portion 8 is formed from, for example, an insulating curable resin composition.

  Examples of the insulating curable resin composition include an insulating thermosetting resin composition, an insulating ultraviolet curable composition, and the like. Preferably, the gap between the control elements 21 can be reliably cured, and the battery pack. An insulating thermosetting resin composition is mentioned from a viewpoint that the intensity | strength of 1 is excellent.

  The insulating curable resin composition preferably has tackiness (pressure-sensitive adhesiveness). Thereby, at the time of manufacture of the battery pack 1, it can adhere | attach easily to each member (The coil member 28, the control circuit part 66, the positive electrode terminal part 68), and can suppress the position shift in the surface direction of each member. .

  The insulating thermosetting resin composition contains a thermosetting resin.

  Examples of the thermosetting resin include epoxy resin, phenol resin, melamine resin, vinyl ester resin, cyano ester resin, maleimide resin, and silicone resin. From the viewpoint of securely sealing and fixing each member, preferably, an epoxy resin and a phenol resin are used, and a combination of an epoxy resin and a phenol resin is used.

  The insulating thermosetting resin composition preferably further contains a thermoplastic resin from the viewpoint of tackiness.

  Examples of the thermoplastic resin include natural rubber, butyl rubber, isoprene rubber, chloroprene rubber, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-acrylic acid ester copolymer, polybutadiene resin, polycarbonate resin, Thermoplastic polyimide resin, polyamide resin (6-nylon, 6,6-nylon, etc.), phenoxy resin, acrylic resin, saturated polyester resin (PET, etc.), polyamideimide resin, fluororesin, styrene-isobutylene-styrene block copolymer Etc. Preferably, an acrylic resin is mentioned from a viewpoint of compatibility with a thermosetting resin and tackiness.

  The ratio of the thermoplastic resin is, for example, 60% by mass or more, preferably 80% by mass or more, and, for example, 99% by mass or less, preferably with respect to the total amount of the thermosetting resin and the thermoplastic resin. Is 95% by mass or less.

(Assembling the battery pack)
With reference to FIGS. 14A to 14E, a second embodiment of assembling (manufacturing) the battery pack of the present invention will be described.

  The assembly of the battery pack 1 includes, for example, a preparation process, a magnetic sheet arrangement process, an insulating thermosetting sheet arrangement, a curing process, and a battery arrangement process.

[Preparation process]
In the preparation step, the secondary battery 2, the coiled substrate 3, the magnetic sheet 4, and a plurality (two) of insulating thermosetting sheets 110 are prepared as members.

  A plurality (two) of insulating thermosetting sheets 110 (first insulating thermosetting sheet 110A and second insulating thermosetting sheet 110B) are each made from the above-described insulating thermosetting resin composition. It is formed in a shape.

  The insulating thermosetting sheet 110 has a circular shape in plan view. The insulating thermosetting sheet 110 includes the coil member 28 when projected in the vertical direction. Specifically, the insulating thermosetting sheet 110 has substantially the same shape as the coil member 28 or a larger shape in plan view.

  The thickness of the first insulating thermosetting sheet 110A and the second insulating thermosetting sheet 110B is, for example, 0.2 mm or more, preferably 0.8 mm or more, and for example, 2 mm or less, preferably Is 1.5 mm or less.

[Magnetic sheet placement process]
In the magnetic sheet arranging step, the magnetic sheet 4 is arranged on the coil member 28 as shown in FIG. 14A.

  First, the coiled substrate 3 is bent. Specifically, the second joint base portion 34 and the third joint base portion 35 are bent so that the positive electrode terminal portion 68, the coil member 28, and the control circuit portion 66 are arranged in parallel to each other in the surface direction. On the other hand, the first joint base portion 33 is not bent.

  At this time, in order to arrange the first insulating thermosetting sheet 110 </ b> A between the control circuit portion 66 and the coil member 28 in the insulating thermosetting sheet arrangement step described later, the coil member 28 and the control circuit base are arranged. The two portions of the third joint base part 35 are bent at right angles (valley folds) so that the distance from the part 30 is slightly wider. Similarly, in order to arrange the second insulating thermosetting sheet 110B between the coil member 28 and the positive electrode terminal portion 68, the interval between the coil member 28 and the positive electrode terminal base portion 32 is slightly widened. The two joint base portions 34 are bent so that they are at right angles (valley folds).

  In addition, the length of the 2nd joint base part 34 and the 3rd joint base part 35 is changed suitably so that the insulating thermosetting sheet 110 can be arrange | positioned.

  As a result, a partially folded circuit 69A that is partially folded is obtained.

  Subsequently, the magnetic sheet 4 is disposed on the coil member 28 of the partially folded circuit 69 </ b> A via the insulating adhesive layer 6. Specifically, it is the same as in the first embodiment.

  Thereby, the 2nd intermediate body 111 provided with the magnetic sheet 4, the insulating contact bonding layer 6, and the partial bending circuit 69A is obtained.

[Insulating curable sheet placement process]
In the insulating curable sheet arrangement, the insulating thermosetting sheet 110 is arranged on the second intermediate 111 as shown in FIG. 14B. That is, a plurality of insulating thermosetting sheets 110 are inserted between the circuit board 29 and the coil member 28.

  Specifically, in the second intermediate 111 </ b> A, the first insulating thermosetting sheet 110 </ b> A is inserted between the control circuit portion 66 and the coil member 28, and the coil member 28 and the positive electrode terminal portion 68 are interposed. Then, the second insulating thermosetting sheet 110B is inserted.

  Thereby, the insulating thermosetting sheet 110 is disposed on the second intermediate body 111.

[Curing process]
In the curing step, the heating step is performed while compressing the insulating thermosetting sheet 110 as shown in FIGS. 14C-D.

  First, as shown in FIG. 14C, a support plate 112, a second intermediate 111 with an insulating thermosetting sheet 110, a release film 113, a spacer 114, and a pressing plate 115 are prepared, and these are arranged in order.

  The support plate 112 is a substrate that supports the second intermediate body 111 from below, and is formed of a rigid material such as a stainless steel substrate, for example.

  The release film 113 is a film for sealing so that the insulating thermosetting sheet 110 does not melt and flow out of the obtained battery pack 1. For example, the release film 113 is a fluororesin film, and the surface is subjected to a release treatment. A film etc. are mentioned.

  The spacer 114 is a member for adjusting the insulating resin fixing portion 8 in the second intermediate body 111 into a desired shape, and has a through-hole 116 that penetrates the spacer 114.

  The through-hole 116 has a substantially circular shape in plan view, and is formed to have substantially the same shape as the secondary battery 2 in plan view.

  The thickness of the spacer 114 is substantially the same as the thickness of the insulating resin fixing portion 8 in the battery pack 1 to be obtained.

  The pressing plate 115 is a substrate that applies pressure to the insulating thermosetting sheet 110, and is formed of a rigid material such as a stainless steel substrate, for example.

  Next, as shown in FIG. 14C, the pressing plate 115 so that the second intermediate body 111 with the insulating thermosetting sheet 110 and the central portion of the release film 113 are accommodated in the through-hole 116 of the spacer 114. Is pressed toward the support plate 112.

  Next, as shown in FIG. 14D, a heating step is performed. Thereby, the insulating thermosetting sheet 110 is melted and cured.

  Specifically, the insulating thermosetting sheet 110 (the first insulating thermosetting sheet 110 </ b> A and the second insulating thermosetting sheet 110 </ b> B) is spread in the surface direction, and the upper and side surfaces of the control circuit unit 66. The upper surface, the side surface and the lower surface of the coil member 28, the side surface and the lower surface of the positive electrode terminal portion 68, and the entire side surface of the joint base portion (the second joint base portion 34 and the third joint base portion 35) are coated and cured.

  Thereby, the insulating resin fixing | fixed part 8 which is a hardening body of the insulating thermosetting sheet 110 (110A of 1st insulating thermosetting sheets and 110B of 2nd insulating thermosetting sheets) is formed. At this time, the insulating thermosetting sheet 110 spreads outward in the surface direction by heating and pressing, and covers (embeds) the entire surface around the second joint base portion 34 and the third joint base portion 35. On the other hand, the insulating thermosetting sheet 110 is slightly thinner in the vertical direction because it spreads outward in the surface direction. Further, since the second joint base portion 34 and the third joint base portion 35 are pressed outward in the surface direction, they are bent by two folds 61 and 62, respectively.

  As a result, the third intermediate body 117 including the partially folded circuit 69A, the insulating adhesive layer 6, the magnetic sheet 4, and the insulating resin fixing portion 8 is obtained.

[Battery placement process]
In the battery arranging step, the third intermediate 117 is arranged in the secondary battery 2 as shown in FIG. 14E. Specifically, the third intermediate 117 is disposed in the secondary battery 2 via the conductive bonding layer 7 (7A, 7B).

  First, in the third intermediate body 117, the two first bent portions 60 of the first joint base portion 33 are bent at right angles (mountain folds) so that the negative electrode terminal base portion 31 is located below the control circuit base portion 30. To place. As a result, a bending circuit 69 in which all the joint portions are bent is obtained.

  Next, the secondary battery 2 is disposed between the control circuit portion 66 and the negative electrode terminal portion 67.

  At this time, the control circuit portion 66 of the bending circuit 69 (substrate 3 with coil) is disposed on the battery positive terminal 18 of the secondary battery 2 via the first conductive bonding layer 7A, and the negative electrode of the bending circuit 69 is provided. The terminal portion 67 is disposed on the battery negative electrode terminal 19 of the secondary battery 2 via the second conductive bonding layer 7B. Specifically, it is the same as in the first embodiment.

  Thereby, as shown to FIG. 14E, the battery pack 1 is obtained.

(Battery pack)
In the battery pack 1, as shown in FIGS. 12A to 13, an insulating resin fixing portion 8 is disposed on the upper side of the secondary battery 2 via the first conductive bonding layer 7 </ b> A, and the insulating resin fixing is fixed. A part of the substrate with coil 3, the magnetic sheet 4, and the insulating adhesive layer 6 are embedded in the portion 8. Specifically, in the insulating resin fixing portion 8, the positive terminal portion 68, the coil member 28, the insulating adhesive layer 6, the magnetic sheet 4 and the control circuit portion 66 are arranged in order from above, and these The member is embedded in the insulating resin fixing portion 8. Further, the second conductive bonding layer 7 </ b> B and the negative electrode terminal portion 67 are disposed below the secondary battery 2.

  The configurations and arrangements of the substrate with coil 3, the magnetic sheet 4, the insulating adhesive layer 6, the first conductive bonding layer 7A, and the second conductive bonding layer 7B are the same as in the first embodiment.

  The insulating resin fixing portion 8 has a substantially circular shape in plan view. The insulating resin fixing portion 8 matches the secondary battery 2 when projected in the vertical direction. Specifically, the insulating resin fixing portion 8 has substantially the same shape as the secondary battery 2 in plan view. The insulating resin fixing portion 8 includes the coil member 28, the control circuit portion 66, and the positive terminal portion 68 when projected in the vertical direction. Specifically, the insulating resin fixing portion 8 has a shape larger than each of the coil member 28, the control circuit portion 66, and the positive electrode terminal portion 68 in plan view.

  The insulating resin fixing portion 8 is in contact with the secondary battery 2, the coiled substrate 3, the magnetic sheet 4, and the housing 5. Specifically, the insulating resin fixing portion 8 is integrally provided with a first insulating resin fixing portion 8A and a second insulating resin fixing portion 8B disposed on the upper side thereof.

  The insulating resin fixing part 8 defines the peripheral side surface of the upper part of the battery pack 1 and is exposed to the outside. The insulating resin fixing portion 8 is a cured body in which the first insulating thermosetting sheet 110 </ b> A and the second insulating thermosetting sheet 110 </ b> B are spread outward in the surface direction when heated.

  The first insulating resin fixing portion 8A is disposed between the coil member 28 and the control circuit portion 66, and the outer peripheral surface thereof is exposed over the entire surface.

  The second insulating resin fixing portion 8B is disposed between the positive terminal portion 68 and the coil member 28, and the outer peripheral surface thereof is exposed over the entire surface.

  The entire side surfaces of the second joint base portion 34 and the third joint base portion 35 of the substrate 3 with coil are covered with the insulating resin fixing portion 8.

  The battery pack 1 of this 2nd Embodiment also has the same effect as 1st Embodiment.

  In the battery pack 1, the insulating resin fixing portion 8 is made of a cured body of the insulating thermosetting sheet 110. For this reason, the insulating resin fixing portion 8 is arranged in the vertical direction between the coil member 28 and the positive terminal portion 68 and the vertical distance between the coil member 28 and the control circuit portion 66 in the insulating thermosetting sheet arrangement process at the time of manufacture. The distance can be made uniform (constant) compared to, for example, a case where a liquid insulating thermosetting composition is used. Therefore, it has excellent dimensional stability.

  Further, according to this battery pack 1, the entire periphery of the substrate 3 with the coil disposed on the upper surface of the secondary battery 2 is covered with the insulating resin fixing portion 8. For this reason, the coil member 28 and the circuit board 29 can be protected against an external impact.

2. Wireless power transmission system and hearing aid The second embodiment of the wireless power transmission system and the hearing aid of the present invention is the same as the first embodiment except that the second embodiment of the battery pack 1 is used. Further, the charging / discharging mechanism, application, operational effects and the like are the same as those in the first embodiment.

3. Modified Example of Second Embodiment Similarly, the modified examples (1) to (6) and (8) to (11) of the first embodiment can be applied as modified examples of the second embodiment.

  14A to 14E, an insulating thermosetting sheet is used. For example, although not shown, an insulating curable sheet such as an insulating ultraviolet curable sheet may be used. it can. In this case, the curing process is appropriately changed according to the type of curing.

  Also in this embodiment, there exists an effect similar to embodiment shown to FIG. 14A-E. Preferably, from the viewpoint that the gap between the control elements 21 can be reliably cured and the strength of the battery pack 1 is excellent, an embodiment shown in FIGS.

  In the battery pack manufacturing method shown in FIGS. 14A to 14E, the magnetic sheet 4 is first arranged after the coiled substrate 3 is bent, but the arrangement order thereof is not limited. For example, although not shown, after the magnetic sheet 4 is disposed on the coiled substrate 3 before being bent, the coiled substrate 3 may be bent.

<Other embodiments>
Other embodiments of the battery pack according to the present invention will be described with reference to FIGS. In the third to fifth embodiments, members similar to those in the first embodiment described above are denoted by the same reference numerals, and description thereof is omitted.

1. Battery Pack The battery pack 1 of the first embodiment includes the coil member 28 and the circuit board 29 (particularly, the control circuit unit 66) on the upper side of the secondary battery 2, but the upper and lower arrangement thereof is not limited, For example, the coil member 28 may be disposed on any of the upper side, the lower side, and both sides of the secondary battery 2, and the circuit board 29 (particularly, the control circuit unit 66) may be disposed on the upper side of the secondary battery 2, It may be arranged on either the lower side or both sides.

  For example, in the third embodiment, as illustrated in the schematic layout diagram of FIG. 15, the coil member 28 is disposed on the lower side of the secondary battery 2, and the circuit board 29 (specifically, the control circuit unit 66 is arranged). ) Is arranged on the upper side of the secondary battery 2. More specifically, the coil member 28 is disposed below the secondary battery 2 and above the negative electrode terminal portion 67. Further, the circuit board 29 (specifically, the control circuit portion 66 and the positive electrode terminal portion 68) is disposed on the upper side of the secondary battery 2 (on the battery positive electrode terminal 18 side). In particular, the coil member 28 and the circuit board 29 are electrically connected by a long third joint base portion 35. The control circuit section 66, the positive terminal section 68, and the coil member 28 of the circuit board 29 are fixed by the insulating resin fixing section 8 as shown in FIGS. 3A-B.

  For reference, a schematic layout of the first embodiment is shown in FIG. In the third embodiment and the fourth to fifth embodiments to be described later, forms other than this arrangement are the same as those in the first embodiment, and the configuration change accompanying the change in the arrangement is appropriately changed from the first embodiment. Applied.

  Further, for example, in the fourth embodiment, as shown in the schematic layout diagram of FIG. 17, the coil member 28 is disposed on the lower side of the secondary battery 2 and the circuit board 29 (specifically, the control circuit). The portion 66) is disposed below the secondary battery 2. More specifically, the coil member 28 is disposed below the secondary battery 2 and above the negative electrode terminal portion 67. In addition, the circuit board 29 (specifically, the control circuit unit 66) is disposed below the secondary battery 2 and above the negative electrode terminal unit 67. The control circuit portion 66 and the coil member 28 of the circuit board 29 are fixed by the insulating resin fixing portion 8 as shown in FIGS. 3A-B.

  Further, for example, in the fifth embodiment, as shown in the schematic layout diagram of FIG. 18, the coil member 28 is disposed on the upper side of the secondary battery 2, and the circuit board 29 (specifically, the control circuit unit). 66) is arranged below the secondary battery 2. More specifically, the coil member 28 is disposed above the secondary battery 2 and below the positive electrode terminal portion 68. In addition, the circuit board 29 (specifically, the control circuit unit 66) is disposed below the secondary battery 2 and above the negative electrode terminal unit 67. The control circuit portion 66 and the coil member 28 of the circuit board 29 are fixed by the insulating resin fixing portion 8 as shown in FIGS. 3A-B.

2. Wireless power transmission system and hearing aid The third to fifth embodiments of the wireless power transmission system and hearing aid of the present invention are the same as the first embodiment except that the third embodiment of the battery pack 1 is used. Further, the charging / discharging mechanism, application, operational effects and the like are the same as those in the first embodiment. The first embodiment is preferable from the viewpoint of further miniaturization and manufacturability.

3. Modifications of Third to Fifth Embodiments Modifications (1) to (11) of the first embodiment can be similarly applied as modifications of the third to fifth embodiments. Moreover, the aspect (form which does not provide a housing | casing) of 2nd Embodiment is also applicable as a modification of 3rd Embodiment.

  (12) In the embodiment shown in FIG. 15, the coil member 28 is not arranged on the upper side of the secondary battery 2. For example, as shown in FIG. 19, the coil member 28 is further arranged on the upper side of the secondary battery 2. You can also That is, the coil member 28 can be arranged on both the upper side and the lower side of the secondary battery 2.

  In this case, in the form shown in FIG. 19, the upper coil member 28 and the lower coil member 28 are directly electrically connected as shown by the solid line in the electrical connection between the upper member and the lower member. However, for example, as indicated by a broken line, the upper circuit board 29 and the lower coil member 28 may be directly electrically connected. It is also possible to employ both of these connections.

  Further, the relative position between the upper coil member 28 and the upper circuit board 29 is not limited. For example, although not shown, the upper coil member 28 is more than the upper circuit board 29 (particularly, the control circuit unit 68). Can also be arranged on the upper side.

  (13) In the embodiment shown in FIG. 19, the circuit board 29 is not disposed below the secondary battery 2. For example, as shown in FIG. 20, the circuit board 29 ( In particular, a control circuit part 68) can also be arranged. That is, the circuit board 29 (in particular, the control circuit unit 68) can be disposed on both the upper side and the lower side of the secondary battery 2.

  In this case, in the embodiment shown in FIG. 20, the upper coil member 28 and the lower coil member 28 are directly electrically connected as shown by the solid line in the electrical connection between the upper member and the lower member. However, as shown by a broken line, for example, the upper circuit board 29 and the lower coil member 28 may be directly electrically connected, and the upper coil member 28 and the lower circuit board 29 may be directly connected. And the upper circuit board 29 and the lower circuit board 29 may be directly electrically connected. These connections can be combined as appropriate.

  The relative position of the lower coil member 28 and the lower circuit board 29 is not limited. For example, although not shown, the lower coil member 28 is connected to the lower circuit board 29 (in particular, the control circuit). It can also be arranged below the part 68).

DESCRIPTION OF SYMBOLS 1 Battery pack 2 Secondary battery 3 Board | substrate 5 with a coil Case 8 Insulating resin fixing | fixed part 8A 1st insulating resin fixing | fixed part 10 1st base insulating layer 11 1st coil pattern 17 Wiring 18 Battery positive electrode terminal 19 Battery negative electrode terminal 23 External circuit positive electrode terminal 28 Coil member 29 Circuit board 80 Wireless power transmission system 81 Power transmission device 82 Power transmission coil 90 Hearing aid 91 Hearing aid housing 92 Microphone means 93 Amplifying means 94 Speaker part 95 Housing part 110 Insulating thermosetting sheet

Claims (10)

A secondary battery having a battery positive terminal disposed on the upper side and a battery negative terminal disposed on the lower side;
A coil member disposed on an upper side and / or a lower side of the secondary battery; and a coil member disposed on an upper side and / or a lower side of the secondary battery, and electrically connected to the battery positive terminal, the battery negative terminal, and the coil member A circuit board to be connected;
A battery pack comprising an insulating resin fixing portion for fixing the coil member and the circuit board. The coil member is disposed on an upper side of the secondary battery;
The battery pack according to claim 1, wherein the circuit board is disposed on an upper side of the secondary battery.   The battery pack according to claim 1, wherein the insulating resin fixing portion includes a coil member when projected in the vertical direction.   The said coil member is a sheet coil provided with an insulating sheet and the coil pattern arrange | positioned at the said insulating sheet, The battery pack as described in any one of Claims 1-3 characterized by the above-mentioned. The coil member includes a plurality of sheet coils,
The battery pack according to claim 4, wherein the insulating resin fixing portion is disposed between the plurality of sheet coils.   The battery pack according to claim 1, further comprising a housing that is disposed on the upper side of the battery pack and accommodates the coil member and the circuit board.   The ratio of the volume of the insulating resin fixing portion to the total volume of the volume of the insulating resin fixing portion arranged inside the housing and the volume of the gap inside the housing is 50% or more. The battery pack according to claim 6.   The battery pack according to claim 1, wherein the insulating resin fixing portion is a cured body of an insulating thermosetting sheet. A wireless power transmission system comprising the battery pack according to claim 1 and a power transmission device including a power transmission coil. The battery pack according to any one of claims 1 to 8,
A hearing aid housing having a housing for housing the battery pack;
A hearing aid comprising a microphone means, an amplifying means, and a speaker portion provided inside the hearing aid housing.

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