JP5486486B2 - Battery unit - Google Patents

Description

  The present invention relates to a battery unit including a chargeable / dischargeable battery and a substrate on which components and the like constituting a circuit are mounted.

  2. Description of the Related Art Conventionally, a battery unit is known that includes a chargeable / dischargeable battery and a board on which components and the like constituting a control circuit for controlling charging and the like of the battery are mounted. As such a battery unit, for example, as disclosed in Patent Document 1, one surface of a coin-type electric element (battery) is connected to a flat substrate by soldering, while the coin-type electric element is A configuration in which a lead plate connected to the other surface is soldered to a substrate is known.

JP 2002-298804 A

  Incidentally, as described above, in the case of a configuration in which a battery is electrically connected to a flat substrate, a connecting member such as a lead plate is required. Therefore, the entire battery unit is equivalent to the lead plate. Increase in size. Specifically, since it is necessary to route the lead plate to the outside of the battery, the size of the battery unit increases accordingly. Further, in order to fix the lead plate on the substrate, it is necessary to secure the connection area of the lead plate on the substrate, and the area of the substrate increases accordingly.

  Therefore, an object of the present invention is to realize a more compact configuration in a battery unit including a chargeable / dischargeable battery and a substrate on which components and the like constituting a circuit are mounted.

  A battery unit according to an embodiment of the present invention includes a battery case partly functioning as a positive electrode terminal and a negative electrode terminal, respectively, configured to be chargeable / dischargeable, and a component for controlling charging of the battery And a substrate provided with a plurality of contacts respectively connected to the positive electrode terminal and the negative electrode terminal of the battery case, and the substrate is connected directly to the positive electrode terminal and the negative electrode terminal of the battery case, respectively. As shown, it is bent along the battery case (first configuration).

  With the above configuration, since the substrate is bent along the battery case, the contact of the substrate can be directly connected to the positive terminal and the negative terminal of the battery case. This eliminates the need for a lead plate or the like for electrically connecting the battery and the substrate, thereby reducing the size of the battery unit. In addition, the manufacturing cost of the battery unit can be reduced because the lead plate or the like is unnecessary.

  Here, the contact is directly connected to the positive terminal and the negative terminal of the battery case, not only when the contact directly contacts the terminal without using a lead wire or the like, but also with an adhesive or double-sided tape. The case where it is bonded and fixed by an adhesive member such as the above is also included.

  In the first configuration, the battery case has a plurality of surfaces, the positive electrode terminal and the negative electrode terminal are respectively configured by different surfaces of the battery case, and the substrate includes the contact points. Are preferably bent so as to be positioned on two surfaces of the battery case constituting the positive electrode terminal and the negative electrode terminal (second configuration).

  Thereby, since different surfaces on the battery case function as a positive electrode terminal and a negative electrode terminal, respectively, it is possible to prevent a short circuit from occurring between the positive electrode terminal and the negative electrode terminal. In addition, in such a configuration, since the substrate is bent so that the respective contacts come into contact with the surface on which the positive electrode terminal and the negative electrode terminal are formed, each contact of the substrate is directly connected to the positive electrode terminal and the negative electrode terminal. It becomes possible to do.

  In the first or second configuration, the battery case is formed in a columnar shape, the positive electrode terminal and the negative electrode terminal are each configured by an end surface of the battery case, and the substrate is the battery case. It is preferable that the battery case is bent so as to be in contact with both end faces and sandwich the battery case in the thickness direction (third configuration).

  Thus, in the configuration in which the positive electrode terminal and the negative electrode terminal are respectively formed on both end surfaces of the battery case formed in the columnar shape, each contact of the substrate can be directly connected to the positive electrode terminal and the negative electrode terminal of the battery case. . Therefore, a board | substrate can be arrange | positioned compactly with respect to a battery, and size reduction of the size of a battery unit can be achieved.

  In the first or second configuration, the battery case is formed in a columnar shape, and one of the positive electrode terminal and the negative electrode terminal is configured by at least a side surface of the battery case, and the positive electrode terminal and the negative electrode It is preferable that the other of the terminals is constituted by an end face of the battery case, and the substrate is bent so as to be positioned on the end face and the side face of the battery case (fourth structure).

  Thereby, when the end surface and the side surface of the columnar battery case function as terminals, the substrate can be disposed compactly with respect to the battery by disposing the substrate on the end surface and side surface of the battery case. it can. In addition, since the battery does not need to be sandwiched between the substrates, the substrate can be made smaller by that amount. Thereby, the manufacturing cost of the battery unit can be reduced and the size of the battery unit can be reduced.

  In the third or fourth configuration, the substrate includes a terminal contact portion that contacts the positive electrode terminal or the negative electrode terminal of the battery case, a side surface portion that is located on a side surface of the battery case, and the side surface portion from the side surface portion. It is preferable to have an extending portion extending along the side surface of the battery case (fifth configuration).

  With such a configuration, in addition to the terminal connection portion that contacts the positive electrode terminal or the negative electrode terminal of the battery case and the side surface portion that is located on the side surface of the battery case, the extension extending from the side surface portion along the side surface of the battery case. It is possible to mount components and the like on the part. That is, with the above-described configuration, the mountable area on the substrate can be increased.

  In any one of the third to fifth configurations, the substrate has a terminal contact portion that contacts the positive electrode terminal or the negative electrode terminal constituted by an end surface of the battery case, and the battery case in a plan view. It is preferable that the size is equal to or smaller than that of the end face (sixth configuration).

  Thereby, the size of the substrate can be reduced. Therefore, the battery unit can be made compact.

  In any one of the first to sixth configurations, it is preferable that the component is mounted on a surface of the substrate opposite to the battery (seventh configuration). Thereby, it is possible to prevent components mounted on the substrate from interfering with the battery. That is, with the above-described configuration, when a component or the like is mounted on the substrate, the degree of freedom of layout of the component or the like can be improved.

  In any one of the first to seventh configurations, the battery case is formed in a columnar shape, and at least one of the positive electrode terminal and the negative electrode terminal is configured by an end surface of the battery case. The substrate includes a terminal contact portion that contacts an end surface of the battery case that constitutes at least one of the positive electrode terminal and the negative electrode terminal, and a side surface portion that is located on a side surface of the battery case, and the side surface portion includes Is preferably provided with a connection terminal electrically connectable to a terminal of an electric device on the surface opposite to the battery (eighth configuration).

  By doing so, it is possible to easily connect the substrate of the battery unit and the outside. Therefore, when the battery unit is disposed in the electrical device, the electrical connection between the electrical device and the battery unit can be easily performed.

  In addition, by providing the connection terminal on the side surface portion of the substrate, it is possible to prevent interference between the component or the like and the terminal of the electric device even when the component or the like is mounted on the terminal contact portion. Here, when a component or the like is mounted on the terminal contact portion of the substrate and a connection terminal is provided, there is a possibility that the terminal of the electrical device and the component or the like cause interference. On the other hand, since the connection terminal and the terminal of the electric device can be connected on the side surface of the battery by forming the connection terminal on the side surface portion of the substrate as described above, the terminal of the electric device is on the end surface of the battery. It is possible to prevent interference with components to be arranged.

  In any one of the first to eighth configurations, it is preferable that at least one of the positive electrode terminal and the negative electrode terminal of the battery case is bonded and fixed to the contact by an adhesive member (9th). Configuration).

  Thereby, the positive electrode terminal and negative electrode terminal of a battery can be more reliably connected with respect to the contact of a board | substrate. Moreover, since it is not necessary to put the battery in a reflow furnace as in the case of fixing with solder, the thermal stress on the battery can be reduced.

  In any one of the first to ninth configurations, the battery has a unit case for housing the battery and the substrate, and the substrate is arranged to cover at least a part of the battery case. An elastic member for biasing the substrate is provided between the substrate and the inner surface of the unit case so that the contact of the substrate is in close contact with the positive terminal and the negative terminal of the battery case. It is preferable (tenth configuration).

  By doing so, the substrate and the battery can be electrically connected without bonding the substrate and the battery with the adhesive member. That is, the substrate and the battery are arranged in the unit case, and the substrate is urged by the elastic member so that the terminal of the substrate is in close contact with the positive terminal and the negative terminal of the battery in the unit case. Thus, the substrate and the battery can be electrically connected.

  Moreover, since it is not necessary to put a battery in a reflow furnace like the case where it connects using solder by the above-mentioned structure, it can prevent that a thermal stress is added to this battery.

  In any one of the first to tenth configurations, the substrate is preferably formed of a deformable flexible substrate (an eleventh configuration). Thereby, since the substrate can be easily deformed so that the contact point of the substrate is directly connected to the positive electrode terminal and the negative electrode terminal of the battery, each of the above-described configurations can be easily realized.

  According to the battery unit of one embodiment of the present invention, since the substrate is bent along the battery case so that the contact of the substrate is directly connected to the positive terminal and the negative terminal of the battery case, the lead plate Etc., and a compact battery unit can be realized.

1 is a perspective view illustrating a schematic configuration of a battery unit according to Embodiment 1. FIG. FIG. 2 is a diagram in which illustration of components and connection terminals is omitted in the section taken along line II-II in FIG. FIG. 3 is a plan view showing a schematic configuration of the flexible substrate. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a partial cross-sectional view illustrating a schematic configuration of the battery unit according to the first modification of the first embodiment. FIG. 6 is a plan view illustrating a schematic configuration of the flexible substrate of the battery unit according to the second modification of the first embodiment. FIG. 7 is a partial cross-sectional view illustrating a schematic configuration of the battery unit according to the second embodiment. FIG. 8 is a plan view showing a schematic configuration of the flexible substrate.

  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]
(overall structure)
FIG. 1 is a perspective view showing a schematic configuration of a battery unit 1 according to Embodiment 1 of the present invention. The battery unit 1 includes a battery 2 configured to be chargeable / dischargeable and a flexible substrate 3 disposed so as to sandwich the battery 2. Specifically, the battery unit 1 is configured by arranging a flexible substrate 3 with respect to a flat coin-type battery 2 so as to sandwich the battery 2 in the thickness direction. As will be described later, components and the like for configuring a circuit for controlling charging of the battery 2 are mounted on the flexible substrate 3. FIG. 1 shows a state where only one component 4 is mounted on the flexible substrate 3 as an example.

  As shown in FIG. 2, 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, a positive electrode can 10, and a negative electrode can 20. And an electrode body 40 accommodated in a space formed between the negative electrode can 10 and the positive electrode can 20. Therefore, by combining the positive electrode can 10 and the negative electrode can 20, the battery 2 becomes a substantially cylindrical shape having a plurality of surfaces, more precisely, a flat coin shape. In the space formed between the positive electrode can 10 and the negative electrode can 20 of the battery 2, in addition to the electrode body 40, a nonaqueous electrolytic solution (not shown) is also enclosed. Here, the battery case 2 a is configured by the positive electrode can 10 and the negative electrode can 20.

  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. The positive electrode can 10 includes a circular bottom portion 11 (end surface) and a cylindrical peripheral wall portion 12 (side surface) formed continuously with 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. 2). In the state where the gasket 30 is sandwiched between the positive electrode can 10 and the negative electrode can 20, the opening end side of the peripheral wall portion 12 is bent inward to be caulked against the negative electrode can 20.

  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. 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 flat portion 21 (end surface) that closes one of the openings. Similar to the positive electrode can 10, the peripheral wall portion 22 is also provided so as to extend substantially perpendicular to the flat portion 21 in a longitudinal sectional view. Note that the peripheral wall portion 22 is formed so that the diameter on the opening end portion side becomes larger in a step shape than the base end portion on the flat portion 21 side. The open end side of the peripheral wall portion 12 of the positive electrode can 10 is bent and crimped to the step portion of the peripheral wall portion 22.

  The gasket 30 is made of polypropylene (PP). The gasket 30 is molded on the peripheral wall portion 22 of the negative electrode can 20 so as to be sandwiched between the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20. The material of the gasket 30 is not limited to PP, and a resin composition containing an olefin elastomer in polyphenylene sulfide (PPS), polytetrafluoroethylene (PFA), a polyamide resin, or the like may be used.

  The electrode body 40 is formed by laminating a plurality of substantially disc-shaped positive electrodes 41 and substantially disc-shaped negative electrodes 42 accommodated in a bag-shaped separator 46 in the thickness direction. Thereby, the electrode body 40 has a substantially cylindrical shape as a whole. In addition, the electrode body 40 has a plurality of positive electrodes 41 and negative electrodes 42 laminated so that both end faces are negative electrodes.

  In the positive electrode 41, positive electrode active material layers containing a positive electrode active material such as lithium cobalt oxide are respectively disposed on both surfaces of a positive electrode current collector made of a metal foil such as aluminum.

  In the negative electrode 42, negative electrode active material layers containing a negative electrode active material such as graphite are arranged on both surfaces of a negative electrode current collector made of a metal foil such as copper. The negative electrodes positioned at both ends in the axial direction of the substantially cylindrical electrode body 40 are negative electrode active materials only on one surface side of the negative electrode current collector so that the negative electrode current collector is positioned at the end in the axial direction of the electrode body 40. Has a layer. That is, the substantially cylindrical electrode body 40 has negative electrode current collectors exposed at both ends thereof. One negative electrode current collector of the electrode body 40 abuts on the flat portion 21 of the negative electrode can 20 in a state where the electrode body 40 is disposed between the positive electrode can 10 and the negative electrode can 20. The other negative electrode current collector of the electrode body 40 is positioned on the bottom 11 of the positive electrode can 10 via the insulating sheet 43.

  The separator 46 is a bag-like member formed in a substantially circular shape in plan view, and is formed in a size that can accommodate the substantially disk-shaped positive electrode 41. The separator 46 is constituted by a microporous thin film made of polyethylene having excellent insulating properties. In this way, by forming the separator 46 with a microporous thin film, lithium ions can pass through the separator 46. The separator 46 is formed by wrapping the positive electrode 41 with a single sheet of a rectangular microporous thin film and bonding the overlapping portions of the sheet material by thermal welding or the like.

  The positive electrode current collector of the positive electrode 41 is integrally formed with a conductive positive electrode lead 44 extending outward from the positive electrode current collector in a plan view. The positive electrode current collector side of the positive electrode lead 44 is also covered with a separator 46.

  The negative electrode current collector of the negative electrode 42 is integrally formed with a conductive negative electrode lead 45 extending outward from the negative electrode current collector in a plan view.

  As shown in FIG. 2, the positive electrode 41 and the negative electrode 42 are arranged such that the positive electrode lead 44 of each positive electrode 41 is located on one side and the negative electrode lead 45 of each negative electrode 42 is located on the opposite side of the positive electrode lead 44. Is laminated.

  In the state where the plurality of positive electrodes 41 and the negative electrodes 42 are laminated in the thickness direction as described above, the plurality of positive electrode leads 44 are overlapped at the tip side in the thickness direction and connected to the bottom 11 of the positive electrode can 10 by ultrasonic welding or the like. Is done. Thereby, the plurality of positive electrodes 41 and the bottom 11 of the positive electrode can 10 are electrically connected via the plurality of positive electrode leads 44. On the other hand, the plurality of negative electrode leads 45 are also connected to each other by ultrasonic welding or the like with the leading end side overlapped in the thickness direction. Thereby, the plurality of negative electrodes 42 are electrically connected to each other via the plurality of negative electrode leads 45.

  With the above configuration, in the battery 2, the positive electrode can 10 functions as a positive electrode terminal, while the negative electrode can 20 functions as a negative electrode terminal. In particular, in this embodiment, the bottom portion 11 of the positive electrode can 10 constitutes the positive electrode terminal of the battery 2, and the flat portion 21 of the negative electrode can 20 constitutes the negative electrode terminal of the battery 2.

  As shown in FIGS. 1 and 2, the flexible substrate 3 is electrically connected to the bottom portion 11 of the positive electrode can 10 and the flat portion 21 of the negative electrode can 20 with respect to the flat battery 2 having the above-described configuration. Are arranged to be. Specifically, as shown in FIGS. 1 and 3, the flexible substrate 3 includes two circular terminal contact portions 51 and a connection portion 52 (side surface portion) that connects the terminal contact portions 51 to each other. Yes. As shown in FIG. 2, one of the two terminal contact portions 51 is fixed on the bottom 11 (end surface) of the positive electrode can 10 of the battery 2 by an adhesive 53 (adhesive member) and two The other of the terminal contact portions 51 is fixed on the flat portion 21 (end surface) of the negative electrode can 20 of the battery 2 by an adhesive 53. That is, in the state of FIG.1 and FIG.2, it deform | transforms so that the connection part 52 which connects two terminal contact parts 51 may be bent, and the two terminal contact parts 51 are on the bottom part 11 of the positive electrode can 10, respectively. It is positioned on the flat surface portion 21 of the negative electrode can 20. On the other hand, the deformed connecting portion 52 is located on the side surface of the battery case 2 a, that is, on the peripheral wall portion 12 of the positive electrode can 10 and the peripheral wall portion 22 of the negative electrode can 20.

  Thus, by sticking the terminal contact portion 51 of the flexible substrate 3 to the battery 2, it is possible to prevent the flexible substrate 3 having a small thickness and a low strength from being easily deformed or damaged. In addition, by fixing the terminal contact portion 51 of the flexible substrate 3 using the adhesive 53, it is not necessary to put the battery 2 in a reflow furnace or the like as in the case of fixing by solder, and thermal stress is applied to the battery 2. This can be prevented. The conductive adhesive 53 is usually a thermosetting type, but there is an adhesive that cures at a low temperature of about 25 to 60 degrees, so that it is possible to prevent the battery 2 from being subjected to a large thermal stress.

  The two terminal contact portions 51 of the flexible substrate 3 are formed in the same size as the planar portion 21 of the negative electrode can 20 in plan view. Thereby, the terminal contact part 51 of the flexible substrate 3 can be made smaller than the battery 2, and the flexible substrate 3 can be arranged compactly in the battery 2. Therefore, the battery unit 1 can be made more compact. And since the terminal contact part 51 of the flexible substrate 3 does not protrude from the battery 2, the deformation | transformation and damage of this flexible substrate 3 can be prevented more reliably.

  In the present embodiment, the size of the terminal contact portion 51 is the same as that of the flat portion 21 of the negative electrode can 20 in a plan view, but is not limited thereto, and is larger than that of the flat portion 21 of the negative electrode can 20 in a plan view. It may be small. In addition, if the size of the battery unit 1 can be reduced as compared with the conventional configuration and the flexible substrate 3 can be prevented from being damaged, the size of the terminal contact portion 51 of the flexible substrate 3 can be reduced in plan view. It may be larger than the flat portion 21 of the negative electrode can 20.

  As shown in FIG. 4, the flexible substrate 3 includes a substrate main body 55 made of a film-like resin, and a contact 56 made of a copper foil provided in a central portion of the substrate main body 55 in a plan view of the terminal contact portion 51. And an insulating sheet 57 that covers the other contacts 56 and the substrate body 55 while exposing the central portion of the contacts 56. For example, the thickness of the insulating sheet 57 is 30 μm including the adhesive. Although not particularly illustrated, the substrate main body 55 is electrically connected to the contact 56 and a component (component 4 in this embodiment) mounted on the opposite side of the substrate main body 55 from the contact 56. A through hole is formed.

  As described above, the terminal contact portion 51 of the flexible substrate 3 is fixed to the bottom portion 11 of the positive electrode can 10 and the flat portion 21 of the negative electrode can 20 of the battery 2 with the adhesive 53, thereby being exposed at the terminal contact portion 51. The contact 56 is connected to the positive electrode can 10 and the negative electrode can 20 through the adhesive 53. Here, the adhesive 53 is made of a conductive epoxy resin (for example, TB3380B manufactured by Three Bond Co., Ltd.). Thereby, each contact 56 of the flexible substrate 3 is electrically connected to the positive electrode can 10 and the negative electrode can 20 of the battery 2.

  In the present embodiment, an insulating sheet 57 that covers a part of the contact 56 and the substrate body 55 is provided, and the contact 56 and the bottom portion 11 of the positive electrode can 10 and the flat surface portion 21 of the negative electrode can 20 of the battery 2 are bonded by an adhesive 53. Connected. However, without providing the insulating sheet 57, a conductive double-sided tape (synthetic resin adhesive: for example, No. 5060 (thickness 80 μm) manufactured by Sliontec Co., Ltd.) or the like can be used. The bottom part 11 of the positive electrode can 10 and the flat part 21 of the negative electrode can 20 may be connected. In addition, as shown in Modification 1 described later, the insulating sheet 57 is also provided when the contact 56 of the flexible substrate 3 and the bottom 11 of the positive electrode can 10 and the flat surface 21 of the negative electrode can 20 of the battery 2 are in direct contact. Preferably not. Thus, when the contact 56 of the flexible substrate 3 and the bottom 11 of the positive electrode can 10 of the battery 2 and the flat portion 21 of the negative electrode can 20 are fixed using a double-sided tape or directly contacted, By not providing the insulating sheet 57, the two can be more reliably brought into close contact with each other.

  Further, as described above, when the conductive double-sided tape is used or when the flexible substrate 3 and the battery 2 are brought into direct contact as in Modification 1 described later, the conductive adhesive 53 is used. Since there is no need for heating as in the case, heat stress on the battery 2 can be eliminated.

  On the side of the flexible substrate 3 opposite to the side where the battery 2 is attached, that is, on the side opposite to the side where the contact 56 is exposed, the components 4 constituting a control circuit for controlling the charging of the battery 2 etc. Is implemented (see FIG. 1). In the example of the present embodiment, the component 4 or the like is mounted on the terminal contact portion 51 of the flexible substrate 3. Moreover, in the connection part 52 of the flexible substrate 3, the connection which contacts the terminal of the electric equipment which the battery 2 supplies electric power to the surface on the opposite side to this battery 2 in the state which attached this flexible substrate 3 to the battery 2. A terminal 5 is provided. That is, the connection terminal 5 is provided on the same surface as the component 4 in the flexible substrate 3.

  In this way, by providing the component 4 and the connection terminal 5 on the surface of the flexible substrate 3 opposite to the battery 2, the flexible substrate 3 can be arranged compactly with respect to the battery 2, while the flexible substrate 3 is placed on the flexible substrate 3. The degree of freedom in the layout of the components 4 and the connection terminals 5 provided in the above can be improved. In addition, since the connection terminal 5 is provided on the connection portion 52 of the flexible substrate 3 located on the side surface of the battery 2, the contact with the terminal of the electric device can be realized on the side of the battery 2. However, it is possible to prevent interference with the component 4 mounted on the terminal contact portion 51 of the flexible substrate 3.

(Effect of Embodiment 1)
As described above, according to this embodiment, the contact point 56 of the flexible substrate 3 is bonded and fixed to the bottom portion 11 of the positive electrode can 10 and the flat surface portion 21 of the negative electrode can 20 by the conductive adhesive 53. Thereby, since the flexible substrate 3 can be arrange | positioned so that the positive electrode can 10 and the negative electrode can 20 of the battery 2 may be covered, the flexible substrate 3 can be arrange | positioned compactly with respect to this battery 2. FIG. Accordingly, the entire battery unit 1 can be configured in a compact manner.

  Moreover, the battery unit 1 as a whole can be made more compact by providing the parts 4 and the like constituting the control circuit and the connection terminals 5 on the surface of the flexible substrate 3 opposite to the battery 2. Moreover, since the components 4 and the like and the connection terminals 5 do not interfere with the battery 2 by using the above-described configuration, the degree of freedom in layout of the components 4 and the like and the connection terminals 5 on the flexible substrate 3 can be improved.

(Modification 1 of Embodiment 1)
FIG. 5 shows a first modification of the first embodiment. In the first modification, the battery 2 and the flexible substrate 3 are placed in the unit case 61 in order to connect the contact 56 of the flexible substrate 3 to the bottom 11 of the positive electrode can 10 and the flat portion 21 of the negative electrode can 20. The arrangement differs from that of the first embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Specifically, as shown in FIG. 5, in addition to the battery 2 and the flexible substrate 3, the battery unit 60 includes a unit case 61 and a flexible substrate 3 disposed so as to cover the unit case 61 and the battery 2. And an elastic body 62 (elastic member) positioned between the two.

  The unit case 61 is a resin or metal member, for example, and has a space 61a so that the battery 2 and the flexible substrate 3 can be accommodated therein. In addition, the unit case 61 is configured to be partly separable, and has a configuration that can be sealed in a state where the battery 2 is disposed in the internal space 61a.

  The elastic body 62 is configured to be able to bias the flexible substrate 3 toward the battery 2 by the inner surface of the unit case 61 in a state where the battery 2 and the flexible substrate 3 are disposed in the unit case 61. The elastic body 62 is configured by a member having an elastic restoring force such as rubber or a spring. The elastic body 62 is arranged in the unit case 61 so as to sandwich the battery 2 covered with the flexible substrate 3 in the thickness direction. Further, before the elastic body 62 is arranged in the unit case 61, the entire height of the elastic body 62 is set so that the battery 2 covered with the flexible substrate 3 is sandwiched in the thickness direction. It is formed so as to be larger than the height. As a result, when the battery 2 covered with the flexible substrate 3 is inserted into the unit case 61 while being sandwiched in the thickness direction by the elastic body 62, the flexible substrate 3 is attached to the battery 2 side by the elastic restoring force of the elastic body 62. Be energized by. Therefore, the flexible substrate 3 can be pressed against the battery 2 in the unit case 61 with the above-described configuration, and the contact 56 of the flexible substrate 3 is connected to the bottom portion 11 of the positive electrode can 10 and the flat portion 21 of the negative electrode can 20. Can be connected to.

  As described above, when the contact 56 of the flexible substrate 3 is brought into direct contact with the bottom portion 11 of the positive electrode can 10 and the flat surface portion 21 of the negative electrode can 20 of the battery 2, as shown in FIG. The insulating sheet 57 is preferably omitted. By doing so, the contact 56 of the flexible substrate 3 can be exposed to the outermost surface, and the contact 56 and the bottom portion 11 of the positive electrode can 10 of the battery 2 and the flat portion 21 of the negative electrode can 20 can be brought into contact with each other more reliably. Can do.

(Modification 2 of Embodiment 1)
FIG. 6 shows a second modification of the first embodiment. In the second modification, the configuration of the flexible substrate that covers the battery 2 is different from the configuration of the first embodiment. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Specifically, as shown in FIG. 6, the flexible substrate 70 has two extending portions 73 formed integrally with a connecting portion 72 that connects the two terminal contact portions 71 to each other. These extending portions 73 are at least one of the side surfaces of the battery 2 in a state in which the terminal contact portion 71 of the flexible substrate 70 is attached to the bottom portion 11 of the positive electrode can 10 and the flat surface portion 21 of the negative electrode can 20. It extends from the connection part 72 so as to cover the part.

  By providing the extending portion 73 as described above, it is possible to mount components and the like on the extending portion 73. Therefore, by providing the extension part 73, the mounting area of components and the like in the battery unit can be increased.

  In this modification, two extending portions 73 are provided. However, the present invention is not limited to this, and only one extending portion 73 may be provided. The number and length of the extending portions 73 are appropriately determined according to the components, terminals, etc. provided on the flexible substrate 70.

[Embodiment 2]
FIG. 7 shows a schematic configuration of the battery unit 80 according to the second embodiment. This battery unit 80 is different from the configuration of the first embodiment in that the flexible substrate 81 is in electrical contact with the side surface of the battery 2. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Specifically, as shown in FIGS. 7 and 8, the flexible substrate 81 includes a terminal contact portion 82 connected to the flat portion 21 of the negative electrode can 20 of the battery 2 and a tongue extending from the terminal contact portion 82. Part 83. Since the terminal contact part 82 is the same structure as the terminal contact part 51 of Embodiment 1, description is abbreviate | omitted. As shown in FIG. 8, the tongue 83 is formed in a substantially rectangular shape in plan view, and is configured such that the contact 85 is exposed in a substantially rectangular range. In addition, the cross-sectional structure of the tongue part 83 is the same as that of the terminal contact part 82, ie, the terminal contact part 51 of Embodiment 1, and detailed description is abbreviate | omitted.

  In the terminal contact portion 82 of the flexible substrate 81, the contact 84 is bonded and fixed to the flat portion 21 of the negative electrode can 20 of the battery 2 with an adhesive 53, similarly to the terminal contact portion 51 of the first embodiment. Thereby, the contact 84 of the flexible substrate 81 and the flat part 21 of the negative electrode can 20 of the battery 2 are electrically connected.

  In the tongue 83 of the flexible substrate 81, a contact 85 exposed in a substantially rectangular range is bonded and fixed to the peripheral wall 12 of the positive electrode can 10 of the battery 2 by an adhesive 53. That is, in this embodiment, the flexible substrate 81 is electrically connected to the peripheral wall portion 12 (side surface of the battery case 2a), not the bottom portion 11 of the positive electrode can 10. Here, in the present embodiment, the peripheral wall portion 12 of the positive electrode can 10 constitutes the positive electrode terminal of the battery 2.

  In this embodiment as well, the extension portion 73 similar to that of the second modification of the first embodiment may be provided on the tongue portion 83. By providing the extension part 73 as in the second modification of the first embodiment, it is possible to increase the area where components and the like can be mounted.

  Also in this embodiment, as in the first embodiment, components or the like may be mounted on the terminal contact portion 82 or a connection terminal may be provided on the tongue portion 83.

(Effect of Embodiment 2)
As described above, according to this embodiment, the flexible substrate 81 is configured to be connected to the flat portion 21 of the negative electrode can 20 of the battery 2 and the peripheral wall portion 12 of the positive electrode can 10. That is, the flexible substrate 81 is configured to have a terminal contact portion 82 connected to the flat portion 21 of the negative electrode can 20 and a tongue portion 83 connected to the peripheral wall portion 12 of the positive electrode can 10. Thereby, the battery 2 and the substrate can be connected without using a lead wire or the like, and the flexible substrate 81 can be disposed compactly with respect to the battery 2.

  Moreover, in the configuration of this embodiment, it is not necessary to extend the flexible substrate 81 to the bottom 11 of the positive electrode can 10 of the battery 2, so that the size of the flexible substrate 81 can be reduced. As a result, the manufacturing cost can be reduced and the battery unit 80 can be made more compact as the flexible substrate 81 to be used becomes smaller.

(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, the flexible substrates 3, 70, 81 are used as the substrate to be arranged with respect to the battery 2. However, a rigid substrate may be used as the substrate.

  In each of the above embodiments, the terminal contact portions 51, 71, 82 of the flexible substrates 3, 70, 81 are formed in a substantially circular shape in plan view. However, the shape of the terminal contact portions 51, 71, 82 may be any shape such as a substantially rectangular shape. Similarly, the shapes of the contacts 56 and 84 provided in the terminal contact portions 51, 71, and 82 may be other than a circle, and the shape of the contact 85 provided in the tongue 83 may be a shape other than a rectangle. .

  In each said embodiment, when the flexible substrate 3 and the battery 2 are connected with a double-sided tape, or when both contact directly, the insulation sheet 57 is made omissible. However, the insulating sheet 57 may be omitted in the case of other configurations.

  In each of the above embodiments, the battery 4 is configured as a lithium ion battery. However, the battery 4 may be a battery other than a lithium ion battery as long as it is a rechargeable secondary battery. The shape of the battery is not limited to a coin shape, and may be any shape such as a columnar shape or a rectangular parallelepiped shape.

  In each of the embodiments, the sealing can is a negative electrode can and the outer can is a positive electrode can. However, the sealed can may be a positive electrode can and the outer can may be a negative electrode can. In this case, the electrode body 40 inside the battery is disposed upside down.

  The battery unit according to the present invention can be used in a configuration including a chargeable / dischargeable battery and a substrate on which components and the like constituting a circuit are mounted.

1, 60, 80: battery unit, 2: battery, 2a: battery case, 3, 70, 81: flexible substrate, 4: component, 5: connection terminal, 10: positive electrode can, 11: bottom (end face), 12: Peripheral wall portion, 20: negative electrode can, 21: flat surface portion (end surface), 22: peripheral wall portion, 51, 71, 82: terminal contact portion, 52, 72: connection portion, 53: adhesive (adhesive member), 61: unit Case 62: Elastic body (elastic member) 73: Extension part 56, 84, 85: Contact

Claims (11)

A battery part of which has a battery case that functions as a positive electrode terminal and a negative electrode terminal, respectively, and is configured to be chargeable / dischargeable,
A substrate provided with a part for controlling charging of the battery and a plurality of contacts respectively connected to a positive terminal and a negative terminal of the battery case ;
A connection terminal provided on the substrate and electrically connectable with a terminal of the electrical device ;
The substrate is bent along the battery case such that the contacts are directly connected to the positive terminal and the negative terminal of the battery case, respectively .
A battery unit in which the substrate is interposed between the connection terminal and the battery case . The battery unit according to claim 1,
The battery case has a plurality of surfaces,
Each of the positive terminal and the negative terminal is configured by different surfaces of the battery case,
The battery unit is a battery unit that is bent so that the respective contacts are positioned on two surfaces of the battery case constituting the positive electrode terminal and the negative electrode terminal. The battery unit according to claim 1 or 2,
The battery case is formed in a columnar shape,
Each of the positive terminal and the negative terminal is constituted by an end face of the battery case,
The battery unit is a battery unit that is in contact with both end faces of the battery case and is bent so as to sandwich the battery case in the thickness direction. The battery unit according to claim 1 or 2,
The battery case is formed in a columnar shape,
One of the positive electrode terminal and the negative electrode terminal is configured by at least a side surface of the battery case, and the other of the positive electrode terminal and the negative electrode terminal is configured by an end surface of the battery case,
The battery unit is a battery unit that is bent so as to be positioned on an end surface and a side surface of the battery case. The battery unit according to claim 3 or 4,
The substrate is
A terminal contact portion that contacts the positive terminal or the negative terminal of the battery case;
A side surface located on a side surface of the battery case;
A battery unit comprising: an extension portion extending from the side surface portion along the side surface of the battery case. The battery unit according to any one of claims 3 to 5,
The battery unit is a battery unit in which a terminal contact portion that contacts the positive electrode terminal or the negative electrode terminal constituted by an end surface of the battery case has a size equal to or smaller than that of the end surface of the battery case in a plan view. The battery unit according to any one of claims 1 to 6,
The component is a battery unit mounted on a surface of the substrate opposite to the battery. The battery unit according to any one of claims 1 to 7,
The battery case is formed in a columnar shape,
At least one of the positive terminal and the negative terminal is constituted by an end face of the battery case,
The substrate includes a terminal contact portion that contacts an end surface of the battery case that constitutes at least one of the positive electrode terminal and the negative electrode terminal, and a side surface portion that is positioned on a side surface of the battery case,
The battery unit, wherein the side surface is provided with the connection terminal on a surface opposite to the battery. The battery unit according to any one of claims 1 to 8,
A battery unit in which at least one of a positive electrode terminal and a negative electrode terminal of the battery case is bonded and fixed to the contact by an adhesive member. The battery unit according to any one of claims 1 to 9,
A unit case for housing the battery and the substrate;
The substrate is disposed so as to cover at least a part of the battery case,
A battery is provided between the substrate and the inner surface of the unit case, and an elastic member that biases the substrate so that the contact of the substrate is in close contact with the positive terminal and the negative terminal of the battery case. unit. The battery unit according to any one of claims 1 to 10,
The said board | substrate is a battery unit comprised by the flexible board | substrate which can deform | transform.

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