JP6363286B2 - Battery unit - Google Patents

Description

  The present invention relates to a battery unit including a battery and a substrate.

  Conventionally, a battery unit including a battery and a substrate is known. As such a configuration, for example, as disclosed in Patent Document 1, a configuration in which a protection circuit or the like is disposed above a battery case is known.

JP 2009-152183 A

  By the way, in the case of the structure disclosed in Patent Document 1, a battery pack having a relatively large size is used. Therefore, there is a sufficient space for arranging the protection circuit above the battery case. However, when a small battery such as a coin-type battery is used, the battery unit is increased in size by the protection circuit. For example, as a configuration of the battery unit including the battery and the substrate, a configuration in which the substrate is arranged in the thickness direction with respect to the battery is conceivable. In this case, the thickness of the battery unit increases by the amount of the substrate. Thus, when a battery unit becomes large in the thickness direction, the thickness of the small apparatus using this battery unit will also increase.

  Therefore, an object of the present invention is to obtain a compact configuration in a battery unit including a battery and a substrate.

  A battery unit according to an embodiment of the present invention includes: a columnar battery; a substrate disposed on a side of the battery so that one surface in a thickness direction faces at least a part of the side surface of the battery; A holder for holding the battery and the substrate (first configuration);

  Thus, by arranging the substrate on the side of the columnar battery, the substrate or the like is not arranged in the thickness direction of the battery. Therefore, compared with the structure which arrange | positions a board | substrate in the thickness direction of a battery, a battery unit can be made into a compact structure in the thickness direction.

  Moreover, by arranging the substrate on the side of the battery so that one surface in the thickness direction faces at least a part of the side surface of the battery, the substrate can be disposed closer to the battery. Thereby, the size of the battery unit in the direction intersecting with the axis of the battery can be made compact.

  Therefore, with the above-described configuration, the battery unit including the battery and the substrate can be made compact.

  In the first configuration, the holder preferably includes a battery storage unit that stores the battery, and an opening that holds the substrate so that the other surface of the substrate is exposed (second configuration). ).

  Accordingly, the battery and the substrate can be held in the arrangement as in the first configuration by the holder having a simple configuration. Therefore, the first configuration can be realized with a simple configuration.

  In the second configuration, it is preferable that the substrate has an external terminal electrically connected to the device on the other surface (third configuration).

  By doing so, the battery unit can be easily electrically connected to the external device.

  In the third configuration, the substrate preferably includes a circuit component mounted on the one surface (fourth configuration).

  Thereby, circuit components are not exposed to the outside of the battery unit. Therefore, it is possible to prevent the circuit component from being damaged or the user or the like from touching the circuit component.

  In any one of the second to fourth configurations, the substrate has a protruding portion protruding from a peripheral portion, the holder is provided in the opening, and the protruding portion of the substrate is It is preferable to further include a notch to hold (fifth configuration).

  In this way, the peripheral edge of the substrate can be easily held at the opening of the holder. That is, the substrate can be easily held at the opening of the holder by a simple configuration in which the protruding portion of the substrate is held by the notch portion of the holder.

  In any one of the first to fifth configurations, the holder is disposed so as to overlap a side surface of the battery when the battery is viewed from a side without covering an end face in an axial direction of the battery. Preferably (sixth configuration).

  Thereby, the axial thickness of the battery in the battery unit can be made as small as possible. That is, since the end face in the axial direction of the battery is not covered with the holder, the battery unit can be downsized as compared with the configuration in which the end face in the axial direction of the battery is covered with the holder.

  In any one of the second to sixth configurations, the device further includes a plurality of connection terminals that electrically connect the substrate and the battery, and the plurality of connection terminals have one end on the one surface. It is preferable that the other end side includes a connection terminal sandwiched between the side surface of the battery and the battery housing portion (seventh configuration).

  In this way, by sandwiching the other end side of the connection terminal whose one end side is connected to the substrate between the battery and the holder, the battery and the substrate can be electrically connected by the connection terminal. Therefore, with the above-described configuration, electrical connection between the battery and the substrate can be easily performed.

  In the first configuration, the holder has a U-shape when viewed from the thickness direction of the battery, the battery has a circular shape when viewed from the thickness direction, and is disposed on a curved portion of the holder. Is preferably disposed in the opening of the holder as viewed from the thickness direction of the battery (eighth configuration).

  Thereby, a battery can be hold | maintained at the curved part of a U-shaped holder. And a board | substrate can be hold | maintained in the opening part of a holder. Therefore, with the above configuration, the battery and the substrate can be held by a holder having a simple configuration.

  In any one of the first to eighth configurations, the battery further includes a wireless power feeding coil stacked in a thickness direction with respect to the battery, and the holder includes the battery, the wireless power feeding coil, and It is preferable to hold the substrate (9th configuration).

  Thereby, the battery unit provided with the coil for wireless power feeding can be realized with a compact configuration.

  According to the battery unit of one embodiment of the present invention, in a state where the substrate is arranged on the side of the columnar battery so that one surface in the thickness direction is parallel to at least a part of the side surface of the battery. The battery and the substrate are held by a holder. Thereby, a compact battery unit is obtained.

1 is a perspective view illustrating a schematic configuration of a battery unit according to Embodiment 1. FIG. FIG. 2 is a top view of the battery unit. FIG. 3 is a cross-sectional view of the cross section taken along the line III-III in FIG. 2 except for the battery. FIG. 4 is a cross-sectional view showing a schematic configuration of the battery. FIG. 5 is a perspective view illustrating a schematic configuration of the battery unit according to the second embodiment. FIG. 6 is a cross-sectional view of the cross section along line VI-VI in FIG. 5 except for the battery.

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

<Embodiment 1>
FIG. 1 is a diagram illustrating a schematic configuration of a battery unit 1 according to the first embodiment. The battery unit 1 includes a battery 2 as a flat secondary battery, a substrate 3 on which a charge control circuit for controlling the charging of the battery 2 and the like, a holder 4 that holds the battery 2, the substrate 3, and the like are connected. Terminals 5 and 6, a wireless power feeding coil 7, and a magnetic shielding sheet 8 are provided. That is, the battery unit 1 is configured to charge the battery 2 with power supplied from a wireless power supply device (not shown) via the wireless power supply coil 7. In addition, such a battery unit 1 is used as a power source for small devices such as a pedometer, a hearing aid, an automobile electronic key, an IC tag, and a sensor unit.

  The battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7 constitute a laminated body 9 by being laminated in the thickness direction thereof (see FIG. 3). As shown in FIGS. 1 and 2, the laminated body 9 is disposed on the curved portion of the substantially U-shaped holder 4. The substrate 3 is held in the opening portion of the substantially U-shaped holder 4. The holder 4 holds the laminated body 9 including the battery 2 on the side surface of the laminated body 9 and holds the substrate 3 so that one surface in the thickness direction faces at least a part of the side surface of the battery 2. To do. Accordingly, the substrate 3 is positioned on the battery 2 side on one side and is parallel to the axis L of the battery 2.

  By arranging the substrate 3 with respect to the battery 2 as described above, the battery unit 1 can be made more compact in the thickness direction than when the substrate is arranged in the thickness direction with respect to the battery. Also, as described above, the substrate 3 is arranged so that one surface in the thickness direction faces at least a part of the side surface of the battery 2, whereby the battery unit 1 is placed in the radial direction of the battery 2 (the axis L of the battery 2 and The structure can be made compact in the crossing direction).

  Below, each structure of the battery 2, the board | substrate 3, the holder 4, and the connection terminals 5 and 6 is demonstrated in detail.

  The battery 2 is a coin-shaped flat battery. As shown in FIG. 4, the battery 2 includes a positive electrode can 10 as a bottomed cylindrical outer can, a negative electrode can 20 as a sealing can covering the opening of the positive electrode can 10, an outer peripheral side of the positive electrode can 10, and a negative electrode A gasket 30 disposed between the outer periphery of the can 20 and an electrode body 40 accommodated in a space formed between the positive electrode can 10 and the negative electrode can 20 are provided. Therefore, the battery 2 is formed into a flat coin shape by combining the positive electrode can 10 and the negative electrode can 20 together. In the space formed between the positive electrode can 10 and the negative electrode can 20, in addition to the electrode body 40, a nonaqueous electrolytic solution (not shown) is also enclosed. Although not described in detail in this embodiment, the electrode body 40 is configured by a laminate of a positive electrode and a negative electrode, for example, as shown in FIG. The battery 2 is configured as, for example, a lithium ion battery.

  The positive electrode can 10 is made of a metal material such as stainless steel, and is formed into a bottomed cylindrical shape by press molding. As shown in FIG. 4, the positive electrode can 10 includes a circular bottom portion 11, and a cylindrical peripheral wall portion 12 formed continuously from the bottom portion 11 on the outer periphery thereof. The peripheral wall portion 12 is provided so as to extend substantially vertically from the outer peripheral end of the bottom portion 11 in a longitudinal sectional view (the state illustrated in FIG. 4). As described later, the positive electrode can 10 is crimped to the negative electrode can 20 by bending the opening end side of the peripheral wall portion 12 inward with the gasket 30 sandwiched between the positive electrode can 20 and the negative electrode can 20. Therefore, the bottom 11 of the positive electrode can 10 constitutes the bottom surface of the battery 2.

  Similarly to the positive electrode can 10, the negative electrode can 20 is made of a metal material such as stainless steel and is formed in a bottomed cylindrical shape by press molding. As shown in FIG. 4, the negative electrode can 20 includes a cylindrical peripheral wall portion 22 whose outer shape is smaller than that of the peripheral wall portion 12 of the positive electrode can 10, and a circular plane portion 21 that closes one of the openings. Therefore, the flat surface portion 21 of the negative electrode can 20 constitutes the upper surface of the battery 2.

  Similar to the positive electrode can 10, the peripheral wall portion 22 of the negative electrode can 20 is also provided so as to extend substantially perpendicular to the flat surface portion 21 in a longitudinal sectional view. The peripheral wall portion 22 is formed with an enlarged diameter portion 22b whose diameter is increased stepwise compared to the base end portion 22a on the flat surface portion 21 side. That is, the peripheral wall portion 22 is formed with a step portion 22c between the base end portion 22a and the enlarged diameter portion 22b. As shown in FIG. 4, the open end side of the peripheral wall portion 12 of the positive electrode can 10 is bent and caulked with respect to the step portion 22c. That is, the positive electrode can 10 has the opening end side of the peripheral wall portion 12 fitted to the step portion 22 c of the negative electrode can 20.

  As shown in FIG. 1, the substrate 3 has a substantially rectangular shape. The substrate 3 has a length in the longitudinal direction equivalent to the diameter of the battery 2. The length of the substrate 3 in the short direction is equal to the thickness of the laminated body 9 including the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7. As will be described later, the substrate 3 is arranged so that both ends in the longitudinal direction are held in the opening 4c of the holder 4 formed in a substantially U shape. That is, the length of the substrate 3 in the longitudinal direction is equal to the interval between the linear portions 4 b of the holder 4 in the opening 4 c of the holder 4.

  The board | substrate 3 has the protrusion part 3a which protrudes in a surface direction outward in the both ends of a longitudinal direction. The protruding portion 3 a has a protruding length equivalent to the thickness of the holder 4. The protrusion 3 a of the substrate 3 is fitted into a notch 4 d described later provided in the opening 4 c of the holder 4. As a result, the substrate 3 is fixed to the opening 4 c of the holder 4.

  As described above, the substrate 3 is disposed on the side of the battery 2 such that one surface in the thickness direction faces at least a part of the side surface of the battery 2. That is, the substrate 3 is fixed to the opening 4 c of the substantially U-shaped holder 4 disposed on the side surface of the battery 2 so that the one surface is parallel to the axis L of the battery 2.

  As shown in FIG. 2, the substrate 3 includes a circuit component 50 mounted on a surface (one surface) located on the battery 2 side. The circuit component 50 constitutes a part of a charge control circuit that controls charging of the battery 2. By mounting the circuit component 50 on the surface of the substrate 3 located on the battery 2 side, the circuit component 50 can be prevented from being exposed to the outside of the battery unit 1. Therefore, it is possible to prevent the circuit component 50 from being damaged or the user or the like from touching the circuit component 50 to get an electric shock. Although not particularly illustrated, a plurality of circuit components 50 may be provided on the surface of the substrate 3 located on the battery 2 side.

  As shown in FIG. 1, the substrate 3 has a plurality of external terminals electrically connected to the device on the surface opposite to the battery 2 in the thickness direction of the substrate 3, that is, on the exposed surface (the other surface). Have Specifically, the substrate 3 has a positive terminal 51 and a negative terminal 52 as external terminals on the exposed surface. Other terminals such as communication terminals may be provided on the exposed surface of the substrate 3.

  Furthermore, the substrate 3 is provided with two terminal notches 3b at the end in the short direction where the wireless power feeding coil 7 is located in a state of being disposed on the side of the laminate 9. These terminal cutouts 3 b are provided at the end of the substrate 3 in the short-side direction and aligned in the longitudinal direction of the substrate 3. Each terminal notch 3b is formed in a semicircular shape when the substrate 3 is viewed from the thickness direction. In addition, each terminal notch 3b is provided with a coil connection terminal (not shown) made of copper plating on the inner surface. With the end portions of the wireless power feeding coil 7 to be described later positioned in the notch portions 3b for each terminal, these end portions are fixed to the coil connection terminals by soldering.

  Further, one end side of the connection terminal 5 formed in a substantially L shape is connected to the exposed surface of the substrate 3. That is, an electrode to which one end side of the connection terminal 5 is connected is formed on the exposed surface of the substrate 3, and one end side of the connection terminal 5 is fixed to the electrode by soldering.

  Here, the connection terminal 5 has a substantially L-shaped shape in which a rectangular flat plate member is bent in the thickness direction at a predetermined position in the longitudinal direction. The connection terminal 5 has one end disposed on the exposed surface of the substrate 3 and the other end positioned on the upper surface of the battery 2, that is, the flat portion 21 of the negative electrode can 20. Arranged with respect to the battery 2. That is, the substantially L-shaped connection terminal 5 is arranged so that a part thereof is located on the exposed surface of the substrate 3 and the remaining part extends in the thickness direction of the substrate 3. The other end of the connection terminal 5 located on the battery 2 is welded to the battery 2.

  As shown in FIG. 2, one end side of a connection terminal 6 formed in a substantially L shape is connected to the surface of the substrate 3 located on the battery 2 side. That is, an electrode to which one end side of the connection terminal 6 is connected is formed on the surface of the substrate 3 located on the battery 2 side, and one end side of the connection terminal 6 is fixed to the electrode by soldering.

  Here, like the connection terminal 5, the connection terminal 6 has a substantially L-shape in which a rectangular flat plate member is bent in the thickness direction at a predetermined position in the longitudinal direction. The connection terminal 6 is disposed on the surface of the substrate 3 on the battery 2 side of the substrate 3, and the other end is positioned on the peripheral wall portion 12 of the positive electrode can 10 of the battery 2. 3 and the battery 2. That is, the substantially L-shaped connection terminal 6 is arranged such that a part thereof is located on the surface of the substrate 3 on the battery 2 side and the remaining part extends in the thickness direction of the substrate 3. The other end portion of the connection terminal 6 positioned on the peripheral wall portion 12 of the positive electrode can 10 of the battery 2 is sandwiched between the peripheral wall portion 12 and a linear portion 4b (to be described later) of the holder 4 while being in contact with the peripheral wall portion 12. It is.

  As described above, the battery 2 and the substrate 3 can be electrically connected in the battery unit 1 by electrically connecting the battery 2 and the substrate 3 with the connection terminals 5 and 6.

  Although not particularly illustrated, the circuit board 50 is electrically connected to the circuit component 50, the positive terminal 51, the negative terminal 52, the connection terminals 5 and 6, and the end of the wireless power feeding coil 7. Yes.

  The holder 4 is made of a resin material such as ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin) and is formed in a substantially U shape as a whole. As shown in FIGS. 1 and 3, the holder 4 has a thickness equivalent to the thickness of the laminated body 9 including the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7. That is, the thickness of the holder 4 is equal to the length of the substrate 3 in the short direction. The holder 4 is formed in an arc shape having a radius of curvature that can hold the coin-shaped battery 2 at the curved portion. The opening portion of the holder 4 has a size capable of arranging the substrate 3.

  Specifically, as shown in FIGS. 1 and 2, the holder 4 includes a substantially semicircular curved portion 4a as viewed from the thickness direction, and a pair of linear portions 4b extending from both ends of the curved portion 4a. The curved portion 4a and the straight portion 4b constitute a battery housing portion that houses the battery 2. Moreover, the opening part 4c of the holder 4 is formed of the edge part of a pair of linear part 4b. The curved portion 4 a has an inner surface with a radius of curvature equal to or smaller than the radius of the battery 2. Thereby, the curved part 4a can be arrange | positioned so that the side surface of the battery 2 may be followed, and the battery 2 can be hold | maintained by this curved part 4a. The pair of linear portions 4b have an interval equal to or smaller than the length in the longitudinal direction of the substrate 3 in the opening 4c. Thereby, in the opening part 4c, the board | substrate 3 can be pinched | interposed and hold | maintained by a pair of linear part 4b.

  As shown in FIG. 1, a notch portion 4 d is formed in each of the pair of linear portions 4 b constituting the opening 4 c of the holder 4. Each notch portion 4d is formed in a substantially rectangular shape when the holder 4 is viewed from the side surface at the central portion in the thickness direction of the end portion of each linear portion 4b. Each notch 4d is formed in a size that allows the protrusion 3a provided on the substrate 3 to be fitted. The board 3 is fixed to the holder 4 by fitting the protrusions 3 a of the board 3 into the notches 4 d.

  As shown in FIG. 2, the pair of straight portions 4b of the holder 4 are arranged on the substrate 3 on which the laminate 9 is arranged in the opening 4c in a state where the laminate 9 is arranged in the semicircular curved portion 4a. It has a length that does not interfere with the circuit component 50.

  The connection terminal 6 having one end connected to the substrate 3 is sandwiched between the end of the straight portion 4b of the holder 4 and the peripheral wall 12 of the positive electrode can 10 of the battery 2. ing.

  The wireless power supply coil 7 is formed by winding a wire member such as a copper wire in a donut shape. The wireless power supply coil 7 has a diameter equivalent to the diameter of the battery 2 so as to have a size equivalent to the outer shape of the battery 2. The wireless power feeding coil 7 is laminated on the battery 2 in the thickness direction of the battery 2. Note that one end of the wire member of the wireless power feeding coil 7 is connected to a coil connection terminal (not shown) by soldering while being positioned in one terminal notch 3b provided on the substrate 3. Is done. The other end of the wire member of the wireless power feeding coil 7 is connected to a coil connection terminal (not shown) by soldering while being positioned in the other terminal notch 3b provided on the substrate 3. Is done.

  Between the wireless power feeding coil 7 and the battery 2, for example, a magnetic shielding sheet 8 made of a magnetic material is disposed. The magnetic shield sheet 8 suppresses the magnetic field generated by the wireless power feeding coil 7 from affecting the battery 2. Like the battery 2 and the wireless power feeding coil 7, the magnetic shield sheet 8 is formed in a substantially circular shape and has the same size as the battery 2 and the wireless power feeding coil 7.

  The magnetic shielding sheet 8 is bonded to the wireless power feeding coil 7 with an adhesive. The magnetic shielding sheet 8 and the wireless power feeding coil 7 are also held by the curved portion 4 a of the holder 4, as with the battery 2.

  With the above-described configuration, the substrate 3 can be disposed with respect to the battery 2 so that the battery unit 1 is compact in the thickness direction. In addition, by storing the wireless power feeding coil 7 in the thickness direction with respect to the battery 2 in the holder 4, the compact battery unit 1 for wireless power feeding can be realized.

  Next, a method for manufacturing the battery unit 1 will be described.

  First, the end portion (the other end portion) of the substantially L-shaped connection terminal 5 is fixed on the upper surface of the battery 2 (the flat portion 21 of the negative electrode can 20) by welding. On the other hand, the circuit component 50 is mounted on one surface of the substrate 3 and one end of the substantially L-shaped connection terminal 6 is fixed by soldering. The magnetic shielding sheet 8 and the wireless power supply coil 7 are bonded with an adhesive.

  A laminated body 9 of the battery 2, the magnetic shielding sheet 8 and the wireless power feeding coil 7 is arranged in the holder 4. At this time, the laminated body 9 is held by the curved portion 4 a of the holder 4.

  With the laminated body 9 disposed in the holder 4, the substrate 3 is disposed in the opening 4 c of the holder 4. The substrate 3 is attached to the opening 4 c of the holder 4 so that one surface thereof faces at least a part of the side surface of the battery 2. At this time, each protrusion 3 a of the substrate 3 is fitted into a notch 4 d provided in each of the pair of straight portions 4 b of the holder 4. Further, one end of the connection terminal 5 fixed to the flat portion 21 of the negative electrode can 20 of the battery 2 is positioned on the exposed surface of the substrate 3 and fixed to the substrate 3 by soldering. On the other hand, the other end portion of the connection terminal 6 fixed to the substrate 3 is sandwiched between the battery 2 and the straight portion 4 b of the holder 4.

  Thereby, the battery unit 1 as shown in FIG. 1 is obtained.

(Effect of Embodiment 1)
In this embodiment, the substrate 3 is disposed on the side of the battery 2 so that one surface in the thickness direction faces at least a part of the side surface of the battery 2. Thereby, compared with the structure which arrange | positions the board | substrate 3 in the thickness direction of the battery 2, the size of the thickness direction of the battery unit 1 can be made compact. Further, by holding the battery 2 and the substrate 3 by the substantially U-shaped holder 4, the battery unit 1 in which the battery 2 and the substrate 3 are arranged as described above can be realized with a simple configuration.

  Moreover, by making the holder 4 substantially U-shaped, the battery 2 can be held by the curved portion 4a and the straight portion 4b, and the holder 4 can be made as compact as possible.

  Further, by stacking the wireless power feeding coil 7 on the battery 2 in the thickness direction and holding the wireless power feeding coil 7 by the holder 4, the battery unit 1 for wireless power feeding can be realized with a simple configuration.

  Further, by mounting the circuit component 50 on the surface of the substrate 3 located on the battery 2 side, the circuit component 50 can be prevented from being exposed to the outside of the battery unit 1. Thereby, it is possible to prevent the circuit component 50 from being damaged, or a user or the like from touching the circuit component 50 to be electrocuted.

  Moreover, the battery unit 1 and an apparatus can be easily connected by providing the exposed surface of the board | substrate 3 with the positive electrode terminal 51 and the negative electrode terminal 52 as an external terminal connected with an apparatus.

  Further, in the present embodiment, the protrusion 3 a is provided at the longitudinal end of the substrate 3, and the notch 4 c is provided at the tip of the linear portion 4 b located at the opening 4 c of the holder 4. The protrusion 3a is fitted into the portion 4c. Thereby, the board | substrate 3 can be easily fixed to the opening part 4c of the holder 4. FIG.

<Embodiment 2>
FIG. 5 shows a schematic configuration of the battery unit 100 according to the second embodiment. The second embodiment is different from the first embodiment in that the holder 101 is formed in a substantially box shape. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, the description thereof is omitted, and only components different from those in the first embodiment are described.

  As shown in FIGS. 5 and 6, the holder 101 is formed in a substantially box shape so as to cover the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7. Specifically, in the holder 101, the top plate 102 and the bottom plate 103 that cover the laminated body 9 of the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7 on both sides in the thickness direction are integrated with the holder 4 shown in the first embodiment. It has a formed configuration. That is, the holder 101 is formed in a substantially box shape having an opening 101a at a portion where the substrate 3 is disposed. Therefore, the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7 are accommodated in the holder 101 so as not to be exposed to the outside.

  Although not particularly illustrated, as in the first embodiment, the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7 are disposed in the curved portion of the side wall of the holder 101, while the substrate 3 is disposed in the opening 101 a of the holder 101. Be placed. In the opening 101a of the holder 101, a notch 101b into which the protruding portion 3a of the substrate 3 is fitted is formed as in the first embodiment.

  The battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7 are inserted into the holder 101 through the opening 101 a of the holder 101. The connection terminals 5 and 6 are arranged in the holder 101 so as to come into contact with the battery 2 when the substrate 3 is attached to the holder 101 while being fixed to the substrate 3 by soldering.

(Effect of Embodiment 2)
In this embodiment, the holder 101 is formed in a substantially box shape that covers the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7. Thereby, the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7 can be more reliably held in the holder 101. In addition, since the battery 2, the wireless power feeding coil 7, the circuit component 50, and the like are sealed in the holder 101, the components in the battery unit 100 are not exposed. Thereby, it can suppress that the components in the battery unit 100 receive an external influence.

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

  In each of the embodiments described above, a coin-shaped flat battery is used as the battery 2, but this is not a limitation, and any shape of secondary battery may be used. When the battery has a shape other than the coin shape, the holders 4 and 101 are preferably matched to the shape of the battery so that the battery can be easily held. The battery may be a primary battery. When the battery is a primary battery, the wireless power feeding coil 7 and the magnetic shielding sheet 8 are not necessary, and a capacitor or the like is mounted on the substrate 3.

  In each of the above-described embodiments, the substrate 3 has a length in the longitudinal direction equivalent to the diameter of the battery 2, and a length in the short direction of the laminate 9 including the battery 2, the magnetic shielding sheet 8, and the wireless power feeding coil 7. It is equivalent to the thickness. However, the substrate 3 may have any size. The size and shape of the holder are preferably matched to the size and shape of the substrate 3.

  In each of the embodiments described above, the connection terminals 6 that connect the positive electrode of the battery 2 and the substrate 3 are arranged so as to extend from the surface of the substrate 3 on the battery 2 side to the side surface of the battery 2. However, similarly to the connection terminal 5, the connection terminal 5 may be disposed so as to extend from the exposed surface of the substrate 3 to the bottom surface of the battery 2, that is, the bottom portion 11 of the positive electrode can 10. That is, the connection terminals 5 and 6 may be arranged so as to sandwich the battery 2.

  In each of the above-described embodiments, the protrusion 3a is provided on the substrate 3, the notches 4d and 101b are provided on the holder 4, 101, and the protrusion 3a is fitted into the notches 4d and 101b. However, the substrate 3 may not be provided with the protruding portion 3a, and the holders 4 and 101 may not be provided with the notched portions 4d and 101b.

  In each of the above embodiments, the exposed surface of the substrate 3 is provided with the positive terminal 51 and the negative terminal 52 as external terminals that are electrically connected to the device. However, the positive electrode terminal 51 and the negative electrode terminal 52 may not be provided on the substrate 3. In this case, an external terminal that is electrically connected to the device may be provided in addition to the substrate 3 or a connection wiring may be drawn from the substrate 3.

  In each of the above embodiments, the magnetic shielding sheet 8 is formed in a circular shape according to the battery 2 and the wireless power feeding coil 7. However, the present invention is not limited to this, and a semicircle and a rectangle are formed according to the shape of the holders 4 and 101. It is good also as a connected shape. As a result, the battery 2 and the wireless power feeding coil 7 can be more reliably separated from each other by the magnetic shielding sheet in the holder 4, 101. Accordingly, it is possible to more reliably prevent the magnetic flux generated from the wireless power feeding coil 7 from affecting the battery 2 and the like.

  The battery unit by this invention can be utilized for the structure provided with the battery and the board | substrate.

DESCRIPTION OF SYMBOLS 1,100: Battery unit, 2: Battery, 3: Board | substrate, 3a: Protrusion part, 4,101: Holder, 4a: Curved part (battery storage part), 4b: Straight part (battery storage part), 4c, 101a: Opening, 4d, 101b: Notch, 5, 6: Connection terminal, 7: Coil for wireless power feeding, 50: Circuit component, 51: Positive terminal (external terminal), 52: Negative terminal (external terminal), L: Axis

Claims (4)

A flat battery having a circular shape when viewed from the thickness direction, the thickness being smaller than the diameter;
On the side of the battery, a circuit board on which a charge control circuit that controls charging of the battery is disposed so that one surface in the thickness direction faces at least part of the side surface of the battery;
A holder for holding the battery and the circuit board;
Longitudinal length of the circuit board held in the holder, Ri diameter equal der of the battery,
The holder has a top plate and a bottom plate, and covers the battery from both sides in the thickness direction of the battery with the top plate and the bottom plate so that the battery is not exposed to the outside.
Battery unit used as a power source for small equipment. The size and shape of the holder, the circuit has been tailored to the size and shape of the substrate, a battery unit used as a power source for small devices of claim 1. The battery used as a power source of a small device according to claim 1 or 2 , wherein a length of the circuit board held by the holder in a short direction is smaller than a height of the holder at a position where the circuit board is held. unit. The battery unit used as a power source of the small device according to claim 1 , wherein the small device is a hearing aid.

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