JP5530381B2 - Battery unit - Google Patents

Description

  The present invention relates to a battery unit including a flat battery.

  Conventionally, a configuration in which a battery and a protection circuit or the like are unitized 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 arranged on a battery case is known.

JP 2009-152183 A

  By the way, in the case of the above-described configuration, in order to configure a battery unit by arranging a circuit unit such as a protection circuit on the battery case, in addition to the circuit board, circuit components, and wiring that configure the circuit unit, the circuit Many parts such as a holding material for arranging the parts are required, and resin molding for covering these parts is also required. As the number of parts increases and the structure becomes complicated, the battery unit manufacturing process also becomes complicated. In a small battery such as a flat battery such as a coin-type battery, if it is attempted to provide a circuit portion in the same manner, it becomes difficult to manufacture a small battery unit, or the entire battery unit is considerably larger than the battery. There is a possibility of becoming. For example, when a battery unit using a flat battery becomes large, it becomes difficult to use the battery unit for a small device using a flat battery.

  Therefore, an object of the present invention is to obtain a battery unit having a simple and compact configuration in a battery unit including a flat battery and a substrate on which a circuit is formed.

  A battery unit according to an embodiment of the present invention includes a flat battery having a flat shape having an upper surface and a bottom surface, a substrate disposed on one of the upper surface and the bottom surface of the flat battery, and the substrate as described above. A housing having a flat portion sandwiched between the flat battery and a side wall portion extending from the outer peripheral side of the flat portion in the thickness direction of the flat portion and fitting to the side surface of the flat battery. The housing is provided with an output terminal electrically connected to the flat battery via the substrate (first configuration).

  With the above configuration, the flat battery and the substrate can be easily integrated by the housing. That is, in the above-described configuration, by fitting the side wall portion of the housing to the side surface of the flat battery, the housing is sandwiched between the flat battery and the flat surface portion of the housing. A flat battery and a substrate can be held.

  Moreover, in the above configuration, the substrate is also housed in the housing together with the flat battery, so that the battery unit as a whole can be made compact and the user can be prevented from touching the substrate directly.

  In addition, since the output terminal is provided in the housing, the flat battery can be discharged through the output terminal.

  In the first configuration, the output terminal is formed on a flat portion of the casing, and is electrically connected to one surface of the flat battery covered with the substrate. The other surface that functions as one electrode of the battery and is not covered by the casing of the flat battery functions as the other electrode of the flat battery (second configuration).

  Thereby, since an electrode exists in both surfaces of a battery unit, it becomes possible to use this battery unit in the aspect similar to the conventional flat battery.

  In the first or second configuration, positive and negative charging terminals electrically connected to the flat battery are provided on the planar portion (third configuration). By doing so, it becomes possible to charge the flat battery by connecting to the terminal of the charging device on the flat surface side of the housing.

  In the third configuration, the flat battery includes a bottomed cylindrical outer can and a sealing can that covers an opening side of the outer can. A connection wiring for electrically connecting the side surface of the outer can of the battery and the substrate is provided (fourth configuration).

  Thereby, it becomes possible to electrically connect the board | substrate arrange | positioned in a housing | casing and the exterior can of a flat battery. That is, in the housing, the substrate and one surface of the flat battery are electrically connected, while the connection wiring provided on the side wall portion of the housing allows the side surface of the flat battery outer can and the substrate to be connected to each other. Are electrically connected. This makes it possible to electrically connect both electrodes of the flat battery and the substrate.

  In any one of the first to fourth configurations, a circuit component is mounted on a surface of the substrate on the plane portion side, and a circuit mounted on the substrate is mounted on the plane portion. A hole in which the component is positioned inward is formed (fifth configuration).

  Thereby, it can prevent that the circuit components mounted on the board | substrate interfere with the plane part of a housing | casing. In addition, since the substrate and the housing can be arranged more compactly by the above-described configuration, the battery unit as a whole can be made compact.

  In the fifth configuration, the output terminal is formed in a peripheral portion of the hole in the planar portion, and the substrate has an outer periphery of the substrate in plan view so as to be in contact with the output terminal. An output terminal electrode is provided on the side (sixth configuration).

  With such a configuration, the output terminal provided on the flat portion of the housing and the output terminal electrode provided on the substrate can be efficiently contacted.

  In the fifth configuration, a positive electrode and a negative electrode charging terminal electrically connected to the flat battery are respectively provided in a peripheral portion of the hole portion formed in the flat portion, and the substrate is provided on the substrate. Are provided with a plurality of charging terminal electrodes on the outer peripheral side of the substrate in a plan view so as to be in contact with the respective charging terminals (seventh configuration).

  With such a configuration, in the configuration in which the positive and negative charging terminals are provided on the flat portion of the casing, the charging terminal and the charging terminal electrode provided on the substrate can be efficiently brought into contact with each other.

  In any one of the first to seventh configurations, the side wall of the housing is formed over the entire side surface of the flat battery so as to cover the side surface of the flat battery. (Eighth configuration).

  By doing so, the area of the side wall portion of the housing that fits with the side surface of the flat battery is increased, so that the flat battery can be more reliably held by the side wall portion. Moreover, since the side surface of the flat battery is covered with the casing by the above-described configuration, the user can be surely prevented from touching the substrate and the appearance of the battery unit can be improved.

  According to the battery unit of one embodiment of the present invention, the flat battery and the substrate are integrated by fitting the housing to the side surface of the flat battery so that the substrate is sandwiched between the flat battery. Can be Thereby, a compact battery unit can be realized with a simple configuration.

FIG. 1 is a perspective view illustrating a schematic configuration of the battery unit according to the embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. 1 excluding the flat battery. 3 is a cross-sectional view taken along the line III-III in FIG. 1 excluding the flat battery. FIG. 4 is a cross-sectional view showing a schematic configuration of a flat battery. FIG. 5 is a plan view showing a schematic configuration of the circuit board. FIG. 6 is a diagram illustrating an example of a battery unit manufacturing method. FIG. 7 is a diagram illustrating an example of a battery unit manufacturing method.

  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.

(overall structure)
FIG. 1 is a diagram showing a schematic configuration of a battery unit 1 according to an embodiment of the present invention. In the battery unit 1, the flat battery 2 and the circuit unit 3 are integrated by housing the coin-shaped flat battery 2 and the circuit unit 3 in a substantially bottomed cylindrical casing 4. Is a unit. The battery unit 1 is used as a power source for small devices using a coin-type battery such as a pedometer, hearing aid, automobile electronic key, IC tag, sensor unit, and the like.

  Specifically, as shown in FIG. 2, the battery unit 1 includes the flat battery 2 in a state in which the circuit unit 3 is disposed on the upper surface of the flat battery 2 (a flat portion 21 of the negative electrode can 20 described later). On the other hand, it is configured by fitting a substantially bottomed cylindrical housing 4 with the circuit portion 3 sandwiched therebetween. Thus, in the battery unit 1, the upper surface side of the flat battery 2 is covered with the circuit portion 3, while the bottom surface (the bottom portion 11 of the positive electrode can 10 described later) side of the flat battery 2 is exposed.

  As shown in FIG. 4, the flat battery 2 includes a positive electrode can 10 as a bottomed cylindrical outer can, a negative electrode can 20 as a sealing can that covers the opening of the positive electrode can 10, and an outer peripheral side of the positive electrode can 10. And the outer periphery of the negative electrode can 20, and an electrode body 40 accommodated in a space formed between the positive electrode can 10 and the negative electrode can 20. Therefore, the flat 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. Moreover, the flat battery 2 is comprised, for example as 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 flat 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 has 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. Yes. Therefore, the flat part 21 of the negative electrode can 20 constitutes the upper surface of the flat 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 FIGS. 1 to 3 and 5, the circuit unit 3 includes a disk-shaped circuit board 51 and a plurality of circuit components 52 mounted on the circuit board 51. The circuit board 51 has a diameter smaller than the inner diameter of the casing 4 so that the circuit board 51 can be arranged inside a substantially bottomed cylindrical casing 4 described later. In addition, a plurality of circuit components 52 are mounted on one surface of the circuit board 51, and the other surface is in electrical contact with the upper surface of the flat battery 2 (the flat portion 21 of the negative electrode can 20). Connection terminals (not shown) are formed. Although not particularly illustrated, the circuit board 51 is formed with a through hole for electrically connecting the connection terminal and the circuit component 52 described above.

  Further, as shown in FIG. 5, on the surface of the circuit board 51 on which the circuit component 52 is mounted, a plurality of electrodes that are in contact with various terminals 65 to 67, which will be described later, provided on the casing 4 are provided on the outer peripheral side portion. 53 to 55 are formed. Specifically, a pair of output terminal electrodes 53 are provided on the surface of the circuit board 51 on which the circuit component 52 is mounted at a position facing each other across the central portion of the circuit board 51 in plan view. . On the surface of the circuit board 51 on which the circuit component 52 is mounted, charging terminal electrodes 54 and 55 are provided between the pair of output terminal electrodes 53 in the circumferential direction of the circuit board 51 in plan view. ing.

  The output terminal electrode 53 is electrically connected to the contact terminal (not shown) via the circuit component 52. Therefore, the output terminal electrode 53 is electrically connected to the negative electrode of the flat battery 2, that is, the negative electrode can 20 through the circuit component 52 and the contact terminal (not shown). Thereby, the output terminal electrode 53 functions as a negative electrode. Each output terminal electrode 53 is in contact with each output terminal 65 (described later) that supplies power to an electric device (not shown) (see FIG. 2).

  The charging terminal electrode 54 is electrically connected to the contact terminal (not shown) via the circuit component 52. Therefore, the charging terminal electrode 54 is electrically connected to the negative electrode of the flat battery 2, that is, the negative electrode can 20 through the circuit component 52 and the contact terminal (not shown). Thereby, the charging terminal electrode 54 functions as a negative electrode. The charging terminal electrode 54 is in contact with a charging terminal 66 (described later) that contacts a terminal of a charging device (not shown).

  The charging terminal electrode 55 is electrically connected to a connection wiring 71 described later via the circuit component 52. As will be described later in detail, the connection wiring 71 is electrically connected to the positive electrode of the flat battery 2, that is, the peripheral wall portion 12 of the positive electrode can 10. Therefore, the charging terminal electrode 55 is electrically connected to the positive electrode side of the flat battery 2 via the circuit component and the connection wiring 71. Thus, the charging terminal electrode 55 functions as a positive electrode. The charging terminal electrode 55 is in contact with a charging terminal 67, which will be described later, in contact with a terminal of a charging device (not shown).

  Further, as shown in FIG. 5, the surface on which the circuit component 52 is mounted on the circuit board 51 is opposed to the charging terminal electrodes 54 and 55 across the central portion of the circuit board 51 in plan view. A connection electrode 56 that contacts the connection wiring 71 is provided at the position. The connection electrode 56 is electrically connected to the circuit component 52. Therefore, the connection electrode 56 electrically connects the positive electrode side of the flat battery 2 and the circuit component 52 via the connection wiring 71. Thereby, the connection electrode 56 electrically connects the flat battery 2 and the circuit unit 3 to form a positive-side charging circuit.

  The housing 4 is made of a resin material (for example, ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin), PP (polypropylene), or the like) formed in a substantially bottomed cylindrical shape. Specifically, as shown in FIGS. 1 to 3, the housing 4 extends in a thickness direction of the flat surface portion 61 on the substantially circular flat surface portion 61 and on the outer peripheral side of the flat surface portion 61. The flat surface portion 61 and the side wall portion 62 are formed integrally.

  The flat portion 61 is formed in a circular shape having a larger diameter than the circuit board 51 described above. Further, the flat portion 61 is provided with a hole 61a in the center portion. That is, the flat surface portion 61 is formed in a donut shape having a hole portion 61a in the central portion. In the hole 61a, when the circuit board 51 is arranged in the housing 4, the circuit component 52 mounted on the circuit board 51 is positioned. Thereby, since the housing | casing 4 and the circuit part 3 can be arrange | positioned more compactly, the battery unit 1 whole can be made compact.

  As shown in FIG. 1, the planar portion 61 has a pair of output terminals 65 that are in contact with terminals of an electrical device (not shown) so as to surround the hole 61 a (in the peripheral portion of the hole 61 a) in plan view. And charging terminals 66 and 67 that are in contact with terminals of a charging device (not shown). Specifically, the pair of output terminals 65 are provided at positions facing the flat surface portion 61 across the hole 61a in plan view. The charging terminals 66 and 67 are provided side by side between the pair of output terminals 65 in the circumferential direction of the plane portion 61. Thus, by forming the pair of output terminals 65 and the charging terminals 66 and 67 on the plane portion 61, the output terminal 65 and the charging terminals 66 and 67 can be easily distinguished.

  The pair of output terminals 65 and charging terminals 66 and 67 are made of a conductive metal material, and are arranged so as to penetrate the flat portion 61 of the housing 4 in the thickness direction (the output terminals in FIG. 2). Only 65 examples are shown). Here, the housing | casing 4 is shape | molded, for example by insert molding so that the plane part 61, the output terminal 65, and the charge terminals 66 and 67 may be integrated. In this embodiment, the housing 4 is insert-molded so that the housing 4 is integrated with the output terminal 65 and the charging terminals 66 and 67. However, the present invention is not limited to this, and the housing 4 is molded. After that, the output terminal 65 and the charging terminals 66 and 67 may be attached to the flat portion 61 of the housing 4.

  As shown in FIG. 2, the output terminal 65 is provided on the flat surface portion 61 so as to be in contact with the output terminal electrode 53 formed on the circuit board 3 in a state where the circuit board 3 is disposed in the housing 4. It has been. As a result, the output terminal 65 provided on the flat portion 61 is electrically connected to the negative electrode side of the flat battery 2 via the output terminal electrode 53 of the circuit board 3 and the circuit formed on the circuit board 3. Has been. Therefore, the output terminal 65 functions as an output terminal on the negative electrode side. In the present embodiment, as will be described later, the bottom surface of the positive electrode can 10 of the battery 2 functions as an output terminal on the positive electrode side.

  Although not particularly shown, the charging terminal 66 is provided on the flat surface portion 61 so as to come into contact with the charging terminal electrode 54 formed on the circuit board 3 in a state where the circuit board 3 is disposed in the housing 4. Yes. As a result, the charging terminal 66 provided on the flat portion 61 is electrically connected to the negative electrode side of the flat electrode 2 via the charging terminal electrode 54 of the circuit board 3 and the circuit formed on the circuit board 3. Has been. Therefore, the charging terminal 66 functions as a charging terminal on the negative electrode side.

  Although not particularly shown, the charging terminal 67 is provided on the flat surface portion 61 so as to come into contact with the charging terminal electrode 55 formed on the circuit board 3 in a state where the circuit board 3 is disposed in the housing 4. Yes. As a result, the charging terminal 67 provided on the flat portion 61 is electrically connected to the positive electrode side of the flat electrode 2 via the charging terminal electrode 55 of the circuit board 3 and the circuit formed on the circuit board 3. Has been. Therefore, the charging terminal 67 functions as a charging terminal on the positive electrode side.

  As shown in FIGS. 2 and 3, the side wall 62 has an inner diameter equal to or less than the outer diameter of the positive electrode can 10 so that the side wall 62 can be fitted to the peripheral wall 12 of the positive electrode can 10 of the flat battery 2. It has a cylindrical shape. Further, the side wall 62 is formed such that its length in the cylinder axis direction is equal to or less than the thickness of the flat battery 2. Thereby, when the housing 4 is fitted to the flat battery 2 from the negative electrode can 20 side, the bottom surface of the positive electrode can 10 of the flat battery 2 is exposed. Therefore, in the battery unit 1, the bottom surface of the positive electrode can 10 of the flat battery 2 functions as an output terminal on the positive electrode side.

  Further, as shown in FIG. 3, the side wall 62 is provided with connection wiring 71 for electrically connecting the peripheral wall 12 of the positive electrode can 10 of the flat battery 2 and the circuit board 51. The connection wiring 71 has a substantially L-shaped cross section, and is provided on the inner side of the housing 4 across the side wall portion 62 and the flat surface portion 61. Specifically, the connection wiring 71 includes a first wall portion 71 a located on the side wall portion 62 of the housing 4 and a second wall portion 71 b located on the flat surface portion 61 of the housing 4. The first wall 71a of the connection wiring 71 is in contact with the peripheral wall 12 of the positive electrode can 10 of the flat battery 2 at one end side. The second wall 71b of the connection wiring 71 is in contact with the connection electrode 56 formed on the circuit board 51 on one end side (see FIG. 3). Thereby, the connection wiring 71 can electrically connect the positive electrode can 10 that is the positive electrode of the flat battery 2 and the connection electrode 56 of the circuit board 51.

  The side wall portion 62 is also formed by, for example, an insert mold so as to be integrated with the connection wiring 71 as in the above-described flat portion 61. However, the present invention is not limited to this, and the connection wiring 71 may be provided on the inner surface of the side wall 62 after the side wall 62 is formed.

  With the above-described configuration, the flat battery 2 and the circuit unit 3 can be compactly unitized. Moreover, since the battery unit 1 is configured by housing the flat battery 2 and the circuit unit 3 in the housing 4, the battery unit 1 can be realized with a simple configuration, and the battery unit 1 can be easily obtained. it can.

  In addition, since the casing 4 is formed in a substantially bottomed cylindrical shape, the positive electrode can of the flat battery 2 is obtained when the casing 4 is fitted to the flat battery 2 from the negative electrode can 20 side. The bottom surface of 10 is exposed. Therefore, the bottom surface of the positive electrode can 10 can be used as it is as a battery electrode. Therefore, the battery unit 1 can be used in the same manner as a conventional flat battery by bringing both surfaces of the battery unit 1 into contact with the terminals on the electric device side in the electric device.

  Further, by providing charging terminals 66 and 67 on the positive electrode side and the negative electrode side on the flat surface portion 61 of the housing 4, charging can be performed by bringing the flat surface portion 61 side into contact with a terminal of a charging device (not shown).

(Battery unit manufacturing method)
Next, a method for manufacturing the battery unit 1 having the above-described configuration will be described with reference to FIGS.

  First, after forming the substantially bottomed cylindrical casing 4 by insert molding, the casing 4 is arranged such that the flat surface portion 61 is on the lower side. Then, as shown in FIG. 6, the circuit unit 3 is arranged on the plane unit 61 in the housing 4. At this time, the circuit part 52 of the circuit unit 3 is positioned in the hole 61 a formed in the flat part 61 of the housing 4 and the circuit board 51 of the circuit part 3 is in contact with the flat part 61. 3 is arranged in the housing 4. At this time, although not particularly illustrated, the output terminal electrode 53 formed on the circuit board 51 is in contact with the output terminal 65 provided on the flat surface 61 and the charging terminal electrode 54 formed on the circuit board 51, The circuit board 51 is positioned with respect to the flat portion 61 of the housing 4 so that 55 contacts the charging terminals 66 and 67 provided on the flat portion 61. In order to facilitate such positioning, positioning irregularities may be provided on the circuit board 51 and the flat portion 61.

  Then, as shown in FIG. 7, the flat battery 2 is inserted into the housing 4 with the negative electrode can 20 facing down. At this time, the flat battery 2 is pushed inward of the housing 4 until the flat portion 21 of the negative electrode can 20 of the flat battery 2 contacts the circuit board 51. Thereby, the flat battery 2 can be reliably fitted by the housing 4 and the negative electrode side of the flat battery 2 can be electrically connected to the circuit board 51 by a contact terminal (not shown).

  In addition, you may fix the flat battery 2, the circuit part 3, and the housing | casing 4 with an adhesive agent, an adhesive tape, etc., respectively. Thereby, since the flat battery 2, the circuit part 3, and the housing | casing 4 can be joined more firmly, it can prevent that the flat battery 2 and the circuit part 3 detach | leave from the housing | casing 4. FIG.

(Effect of embodiment)
As described above, according to this embodiment, the flat battery 2 and the circuit section 3 are sandwiched between the casing 4 and the flat battery 2 in the substantially bottomed cylindrical casing 4. Therefore, the flat battery 2 and the circuit unit 3 can be unitized with a simple configuration. Moreover, since the battery unit 1 can be configured simply by fitting the housing 4 to the flat battery 2 and the circuit unit 3 with the above-described configuration, the battery unit 1 can be easily obtained.

  Further, as described above, since the casing 4 is substantially bottomed cylindrical, in the battery unit 1 obtained by fitting the casing 4 to the flat battery 2 from the negative electrode can 20 side, The bottom surface of the positive electrode can 10 of the flat battery 2 is exposed. On the other hand, the flat portion 61 of the housing 4 is provided with an output terminal 65 on the negative electrode side that is electrically connected to the negative electrode can 20 of the flat battery 2. Thereby, since terminals exist on both surfaces of the battery unit 1, the battery unit 1 can be used in an electric device in the same manner as a conventional flat battery.

  Further, by storing the flat battery 2 and the circuit unit 3 in the housing 4, the strength of the battery unit 1 as a whole can be improved, and the user can be prevented from touching the circuit components 52 in the battery unit 1. .

  Further, since the flat portion 61 of the housing 4 is provided with a hole 61a in which the circuit component 52 of the circuit portion 3 is positioned, the circuit portion 3 and the housing 4 can be more compact without interfering with each other. Can be arranged.

(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 the above-described embodiment, the casing 4 has a substantially bottomed cylindrical shape, but is not limited thereto, and may have other shapes as long as the bottomed cylindrical shape can accommodate the flat battery 2 and the circuit unit 3. .

  In the said embodiment, although the side wall part 62 of the housing | casing 4 is made into cylindrical shape, if it is a structure which can be fitted to the side surface of the flat battery 2 and can hold | maintain this flat battery 2, it will be a side wall. Only a part may be provided.

  In the embodiment, the flat portion 61 of the housing 4 is provided with the hole portion 61a for positioning the circuit component 52 inward. However, without providing the hole portion 61a, for example, a concave portion that does not interfere with the circuit component 52 and the flat surface portion 61 may be provided.

  In the embodiment, the output terminal 65 and the charging terminals 66 and 67 are provided on the flat surface portion 61 of the housing 4. However, the present invention is not limited thereto, and the output terminal 65 and the charging terminals 66, At least one of 67 may be provided.

  In the embodiment, the housing 4 is provided with the two output terminals 65 and the charging terminals 66 and 67. However, the present invention is not limited to this, and the output terminal and the charging terminal may be shared by some or all of them. It may be. In this case, the number of terminals provided in the housing 4 can be reduced.

  In the embodiment, the outer can is the positive electrode can 10 and the sealed can is the negative electrode can 20. However, the present invention is not limited to this, and the outer can may be the negative electrode can and the sealed can may be the positive electrode can.

  In the said embodiment, the flat battery 2 is comprised as a lithium ion battery. However, the flat battery 2 may be a battery other than a lithium ion battery as long as it is a rechargeable secondary battery. Moreover, in the said embodiment, although the flat battery 2 has the electrode body 40 of the laminated structure, it is not restricted to this, An internal electrode structure may be another structure. Further, the flat battery 2 may be a primary battery instead of a secondary battery. When the flat battery 2 is a primary battery, a capacitor or the like is mounted as a circuit unit.

  The battery unit according to the present invention can be used in a configuration including a substrate on which a circuit is formed and a flat battery mounted on a small device.

1: battery unit, 2: flat battery, 3: circuit unit, 4: housing, 10: positive electrode can (outer can), 20: negative electrode can (sealing can), 51: circuit board (substrate), 52: circuit Parts, 53, 54: Output terminal electrode, 54, 55: Charging terminal electrode, 56: Connection electrode, 61: Plane portion, 61a: Hole portion, 62: Side wall portion, 65: Output terminal, 66, 67: Charging terminal 71: Connection wiring

Claims (8)

A flat battery with a flat shape having a top surface and a bottom surface;
A substrate disposed on one of the top and bottom surfaces of the flat battery;
A housing having a flat part sandwiching the substrate between the flat battery and a side wall part extending from the outer peripheral side of the flat part in the thickness direction of the flat part and fitting to a side surface of the flat battery. With body,
The battery unit, wherein the housing is provided with an output terminal electrically connected to the flat battery via the substrate. The battery unit according to claim 1,
The output terminal is formed on the flat portion of the casing, and is electrically connected to one surface of the flat battery covered by the substrate, thereby serving as one electrode of the flat battery. Function,
The other surface of the flat battery that is not covered by the housing functions as the other electrode of the flat battery. The battery unit according to claim 1 or 2,
The battery unit, wherein the planar portion is provided with positive and negative charge terminals electrically connected to the flat battery, respectively. The battery unit according to claim 3,
The flat battery has a bottomed cylindrical outer can and a sealing can that covers the opening side of the outer can,
A battery unit, wherein a connection wiring for electrically connecting a side surface of the outer can of the flat battery and the substrate is provided on a side wall portion of the casing. In the battery unit according to any one of claims 1 to 4,
A circuit component is mounted on the surface of the substrate on the side of the planar portion,
The battery unit, wherein the flat portion is formed with a hole portion in which a circuit component mounted on the substrate is positioned inward. The battery unit according to claim 5, wherein
The output terminal is formed in a peripheral portion of the hole portion in the planar portion,
A battery unit, wherein the substrate is provided with an output terminal electrode on an outer peripheral side of the substrate in plan view so as to be in contact with the output terminal. The battery unit according to claim 5, wherein
The peripheral part of the hole formed in the flat part is provided with positive and negative charging terminals electrically connected to the flat battery,
The battery unit, wherein the substrate is provided with a plurality of charging terminal electrodes on an outer peripheral side of the substrate in a plan view so as to be in contact with the charging terminals. The battery unit according to any one of claims 1 to 7,
The side wall part of the said housing | casing is a battery unit currently formed over the side surface periphery of this flat battery so that the side surface of the said flat battery may be covered.

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