JP5996361B2 - Battery unit - Google Patents

Battery unit Download PDF

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Publication number
JP5996361B2
JP5996361B2 JP2012227957A JP2012227957A JP5996361B2 JP 5996361 B2 JP5996361 B2 JP 5996361B2 JP 2012227957 A JP2012227957 A JP 2012227957A JP 2012227957 A JP2012227957 A JP 2012227957A JP 5996361 B2 JP5996361 B2 JP 5996361B2
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Prior art keywords
substrate
battery
receiving coil
flat battery
case
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JP2014082054A (en
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恭平 竹内
恭平 竹内
恵一 谷井
恵一 谷井
慎也 小松
慎也 小松
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Hitachi Maxell Energy Ltd
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Hitachi Maxell Energy Ltd
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Priority to JP2012227957A priority Critical patent/JP5996361B2/en
Priority to PCT/JP2013/077670 priority patent/WO2014061564A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/216—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for button or coin cells
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/005—Mechanical details of housing or structure aiming to accommodate the power transfer means, e.g. mechanical integration of coils, antennas or transducers into emitting or receiving devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Description

本発明は、充放電可能な扁平形電池及び基板を備えた電池ユニットに関する。   The present invention relates to a chargeable / dischargeable flat battery and a battery unit including a substrate.

従来より、充放電可能な扁平形電池及び基板を備えた電池ユニットが知られている。このような構成としては、例えば特許文献１に開示されるように、角形の電池パック本体を収納する外装ケース内に、平滑回路及び非接触充電用の誘導コイルを配置した構成が知られている。これにより、外装ケース内に収納された電池パック本体に対し、誘電コイルを介して受電した電力を充電することができる。   Conventionally, a battery unit including a chargeable / dischargeable flat battery and a substrate is known. As such a configuration, for example, as disclosed in Patent Document 1, a configuration in which a smoothing circuit and an induction coil for non-contact charging are arranged in an outer case that houses a rectangular battery pack body is known. . Thereby, the electric power received via the dielectric coil can be charged with respect to the battery pack main body accommodated in the exterior case.

特開平９−６３６５５号公報JP-A-9-63655

ところで、上述のような角形の電池パックは、一般的に、外装缶及び封口缶を組み合わせてなる例えばコイン形電池のような扁平形電池に比べて、電池自体のサイズが大きい。そのため、角形の電池パックでは、外装ケース内に回路や誘導コイル等を配置することが可能である。しかしながら、前記扁平形電池は、主に小型機器などに用いられるため、基板を含んだ電池ユニット全体の小型化が要求される。   By the way, the rectangular battery pack as described above is generally larger in size of the battery itself than a flat battery such as a coin-type battery in which an outer can and a sealing can are combined. Therefore, in a rectangular battery pack, it is possible to arrange a circuit, an induction coil, etc. in the exterior case. However, since the flat battery is mainly used for a small device or the like, downsizing of the entire battery unit including the substrate is required.

一方、前記特許文献１に開示される構成のように非接触充電を行う構成の場合、電池ユニット側に受電コイルが必要になる。そのため、受電コイルの分、電池ユニットのサイズが大きくなってしまう。   On the other hand, in the case of a configuration in which contactless charging is performed as in the configuration disclosed in Patent Document 1, a power receiving coil is required on the battery unit side. For this reason, the size of the battery unit is increased by the amount of the power receiving coil.

本発明の目的は、扁平形電池及び基板を備え、該扁平形電池を非接触によって充電可能な電池ユニットにおいて、コンパクトな構成を得ることにある。   An object of the present invention is to obtain a compact configuration in a battery unit that includes a flat battery and a substrate and can charge the flat battery in a non-contact manner.

本発明の一実施形態に係る電池ユニットは、充放電可能な扁平形電池と、前記扁平形電池の充電を制御するための回路部品が実装された基板と、前記扁平形電池に充電する電力を、給電コイルから非接触で受電する受電コイルとを備え、前記扁平形電池は、有底筒状の外装缶と、該外装缶に対して開口を覆うように組み合わされる有底筒状の封口缶とを有し、前記扁平形電池、前記基板及び前記受電コイルは、前記扁平形電池の厚み方向に積層されている（第１の構成）。   A battery unit according to an embodiment of the present invention includes a chargeable / dischargeable flat battery, a board on which circuit components for controlling charging of the flat battery are mounted, and electric power for charging the flat battery. The flat battery has a bottomed cylindrical outer can and a bottomed cylindrical sealing can combined with the outer can to cover the opening The flat battery, the substrate, and the power receiving coil are stacked in the thickness direction of the flat battery (first configuration).

これにより、扁平形電池、基板及び受電コイルを、コンパクトに配置することができる。すなわち、扁平形電池及び基板は厚み方向のサイズが横方向のサイズよりも小さい。そのため、扁平形電池、基板及び受電コイルを厚み方向に積層することにより、電池ユニット全体として小型化を図れる。   Thereby, a flat battery, a board | substrate, and a receiving coil can be arrange | positioned compactly. That is, the flat battery and the substrate are smaller in size in the thickness direction than in the horizontal direction. Therefore, the battery unit as a whole can be reduced in size by stacking the flat battery, the substrate, and the power receiving coil in the thickness direction.

前記第１の構成において、前記基板及び前記受電コイルは、前記扁平型電池を厚み方向に挟んで反対側に配置されるのが好ましい（第２の構成）。これにより、基板と扁平形電池との電気的な接続、及び該扁平形電池と受電コイルとの電気的な接続をそれぞれ確保しつつ、受電コイルを電池ユニットの外方側に配置することができる。しかも、電池ユニットの外方側に位置する基板に、機器と接触する外部端子を設けることも可能になる。よって、扁平形電池を非接触充電によって効率良く充電しつつ、外部機器との接続構造を簡略化することのできる電池ユニットが得られる。   In the first configuration, it is preferable that the substrate and the power receiving coil are disposed on opposite sides of the flat battery in the thickness direction (second configuration). Accordingly, the power receiving coil can be arranged on the outer side of the battery unit while ensuring the electrical connection between the substrate and the flat battery and the electrical connection between the flat battery and the power receiving coil. . Moreover, it is possible to provide an external terminal in contact with the device on the substrate located on the outer side of the battery unit. Therefore, a battery unit capable of simplifying a connection structure with an external device while efficiently charging a flat battery by non-contact charging is obtained.

前記第２の構成において、前記回路部品は、前記基板における前記扁平形電池側の面に実装されているのが好ましい（第３の構成）。これにより、基板に実装された回路部品が露出するのを防止できる。よって、回路部品が衝撃を受けて故障したり、使用者等が回路部品に直接触れたりするのを防止できる。   In the second configuration, the circuit component is preferably mounted on a surface of the substrate on the flat battery side (third configuration). Thereby, it is possible to prevent the circuit component mounted on the substrate from being exposed. Therefore, it is possible to prevent the circuit component from being damaged due to an impact or the user or the like from directly touching the circuit component.

前記第２または第３の構成において、前記基板には、前記扁平形電池とは反対側の面に外部端子が設けられているのが好ましい（第４の構成）。これにより、基板の外方側に位置する面に外部端子が形成されるため、該外部端子が機器と接触する電池ユニットの外部端子として機能する。これにより、電池ユニットの端子構造を簡略化することができるとともに、電池ユニットの外部端子を機器の端子に容易に且つより確実に接触させることができる。   In the second or third configuration, it is preferable that the substrate is provided with an external terminal on a surface opposite to the flat battery (fourth configuration). Thereby, since an external terminal is formed in the surface located in the outer side of a board | substrate, this external terminal functions as an external terminal of the battery unit which contacts an apparatus. Thereby, the terminal structure of the battery unit can be simplified, and the external terminal of the battery unit can be easily and more reliably brought into contact with the terminal of the device.

前記第１から第４の構成のうちいずれか一つの構成において、前記扁平形電池、前記基板及び前記受電コイルを収納可能なケースをさらに備えるのが好ましい（第５の構成）。これにより、扁平形電池、基板及び受電コイルを備えた電池ユニットの強度を向上することができる。   In any one of the first to fourth configurations, it is preferable to further include a case capable of storing the flat battery, the substrate, and the power receiving coil (fifth configuration). Thereby, the intensity | strength of the battery unit provided with the flat battery, the board | substrate, and the receiving coil can be improved.

前記第５の構成において、前記ケースは、前記基板を前記扁平形電池に対して所定距離、離間した状態で保持可能な保持部を有するのが好ましい（第６の構成）。これにより、扁平形電池に対して基板を所定距離、離間した状態で保持することができる。しかも、保持部は、ケースに設けられているため、保持部材を別に設ける必要がない。よって、ケース内に扁平形電池及び基板を収納することにより、保持部によって、該扁平形電池に対して基板を所定距離、離間した状態で保持することができる。   In the fifth configuration, it is preferable that the case has a holding portion that can hold the substrate in a state of being separated from the flat battery by a predetermined distance (sixth configuration). Thereby, a board | substrate can be hold | maintained in the state spaced apart by the predetermined distance with respect to the flat battery. And since the holding | maintenance part is provided in the case, it is not necessary to provide a holding member separately. Therefore, by storing the flat battery and the substrate in the case, the substrate can be held at a predetermined distance from the flat battery by the holding portion.

前記第６の構成において、前記ケースは、筒状に形成されていて、前記保持部は、前記ケースの筒軸方向の一方の端部よりも筒軸方向内方の位置に、該ケースの内方に突出するように設けられていて、前記基板は、前記ケース内に前記保持部よりも前記一方の端部側に配置され、前記扁平形電池及び前記受電コイルは、前記ケース内に前記保持部よりも筒軸方向の他方の端部側に配置されるのが好ましい（第７の構成）。   In the sixth configuration, the case is formed in a cylindrical shape, and the holding portion is located at a position inward of the cylindrical axis with respect to one end in the cylindrical axis direction of the case. The board is disposed in the case on the one end side of the holding part, and the flat battery and the power receiving coil are held in the case. It is preferable to be disposed on the other end side in the cylinder axis direction than the portion (seventh configuration).

これにより、第６の構成を実現できる。すなわち、ケースに設けた保持部によって、扁平形電池と基板とを離間させて配置することが可能になる。   Thereby, the sixth configuration can be realized. In other words, the flat battery and the substrate can be spaced apart by the holding portion provided in the case.

前記第７の構成において、前記保持部には、前記受電コイルまたは前記基板が通過可能な切欠き部が設けられているのが好ましい（第８の構成）。   In the seventh configuration, it is preferable that the holding portion is provided with a notch through which the power receiving coil or the substrate can pass (eighth configuration).

これにより、受電コイルと基板とを接続した状態で、ケースと組み合わせることが可能になる。すなわち、受電コイルと基板とが接続されている構成の場合には、前記保持部によって基板が扁平形電池に対して離間して配置されるようにケース内に受電コイル、基板及び扁平型電池を積層して収納する際に、受電コイルと基板との接続部分がケースと干渉してしまう。これに対し、上述のようにケースに切欠き部を設けて、受電コイル及び基板をケースと組み合わせる際に受電コイルまたは基板を切欠き部に通過させることにより、受電コイルと基板との接続部分がケースと干渉するのを防止できる。   Thereby, it becomes possible to combine with a case in the state which connected the receiving coil and the board | substrate. That is, in the case of a configuration in which the power receiving coil and the substrate are connected, the power receiving coil, the substrate, and the flat battery are placed in the case so that the substrate is separated from the flat battery by the holding portion. When stacked and stored, the connection portion between the power receiving coil and the substrate interferes with the case. On the other hand, when the notch is provided in the case as described above and the receiving coil or the substrate is passed through the notch when the receiving coil and the substrate are combined with the case, the connection portion between the receiving coil and the substrate is reduced. Interference with the case can be prevented.

本発明の一実施形態に係る電池ユニットによれば、充放電可能な扁平形電池、該扁平形電池の充電を制御する回路部品が実装された基板、及び、扁平形電池に充電する電力を非接触で受電する受電コイルを厚み方向に積層する。これにより、コンパクトな構成の電池ユニットが得られる。   According to the battery unit of one embodiment of the present invention, a chargeable / dischargeable flat battery, a substrate on which circuit components for controlling charging of the flat battery are mounted, and electric power for charging the flat battery are A power receiving coil that receives power by contact is stacked in the thickness direction. Thereby, the battery unit of a compact structure is obtained.

図１は、実施形態に係る電池ユニットの概略構成を示す断面図である。FIG. 1 is a cross-sectional view illustrating a schematic configuration of the battery unit according to the embodiment. 図２は、電池ユニットを基板側から見た平面図である。FIG. 2 is a plan view of the battery unit as viewed from the substrate side. 図３は、扁平形電池の概略構成を示す断面図である。FIG. 3 is a cross-sectional view showing a schematic configuration of the flat battery. 図４は、ケースの概略構成を示す斜視図である。FIG. 4 is a perspective view showing a schematic configuration of the case. 図５は、電池ユニットの製造方法を示す図である。FIG. 5 is a diagram showing a battery unit manufacturing method. 図６は、電池ユニットの製造方法を示す図である。FIG. 6 is a diagram showing a battery unit manufacturing method. 図７は、電池ユニットの製造方法を示す図である。FIG. 7 is a diagram showing a battery unit manufacturing method. 図８は、電池ユニットの製造方法を示す図である。FIG. 8 is a diagram showing a battery unit manufacturing method.

以下、図面を参照し、本発明の実施の形態を詳しく説明する。図中の同一または相当部分については同一の符号を付してその説明は繰り返さない。   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.

（全体構成）
図１は、本発明の実施形態に係る電池ユニット１の概略構成を示す斜視図である。図２は、電池ユニット１の平面図である。図１及び図２に示すように、電池ユニット１は、充放電可能に構成された扁平形電池２と、回路部品５１が実装された基板３と、非接触で電力を受電するための受電コイル４とを備える。また、電池ユニット１は、扁平形電池２、基板３及び受電コイル４を収納する概略円筒状のケース５と、該ケース５内に扁平形電池２、基板３及び受電コイル４を収納した状態で、それらを一体化させるためのチューブ６とを備える。チューブ６は、例えばＰＥＴ（ポリエチレンテレフタレート）など、熱によって収縮する樹脂材料からなり、扁平形電池２、基板３、充電コイル４及びケース５の外周側を覆っている。 (overall structure)
FIG. 1 is a perspective view showing a schematic configuration of a battery unit 1 according to an embodiment of the present invention. FIG. 2 is a plan view of the battery unit 1. As shown in FIGS. 1 and 2, the battery unit 1 includes a flat battery 2 configured to be chargeable / dischargeable, a substrate 3 on which circuit components 51 are mounted, and a receiving coil for receiving power in a non-contact manner. 4. The battery unit 1 includes a substantially cylindrical case 5 that houses the flat battery 2, the substrate 3, and the power receiving coil 4, and a state in which the flat battery 2, the substrate 3, and the power receiving coil 4 are housed in the case 5. And a tube 6 for integrating them. The tube 6 is made of a resin material that shrinks by heat, such as PET (polyethylene terephthalate), and covers the outer peripheral side of the flat battery 2, the substrate 3, the charging coil 4, and the case 5.

電池ユニット１では、図１に示すように、扁平状のコイン型の扁平形電池２に対し、該扁平形電池２を挟んで厚み方向の反対側に基板３及び受電コイル４がそれぞれ配置されている。具体的には、電池ユニット１では、受電コイル４、扁平形電池２及び基板３の順に、該扁平形電池２の厚み方向に積層されている。   In the battery unit 1, as shown in FIG. 1, a substrate 3 and a receiving coil 4 are respectively arranged on the opposite side in the thickness direction with respect to the flat coin-shaped flat battery 2. Yes. Specifically, in the battery unit 1, the power receiving coil 4, the flat battery 2, and the substrate 3 are stacked in the thickness direction of the flat battery 2 in this order.

図３に示すように、扁平形電池２は、有底円筒状の外装缶としての正極缶１０と、該正極缶１０の開口を覆う封口缶としての負極缶２０と、正極缶１０と負極缶２０との間に挟みこまれるガスケット３０と、負極缶１０及び正極缶２０の間に形成される空間内に収納される電極体４０とを備える。したがって、扁平形電池２は、正極缶１０と負極缶２０とを合わせることによって、扁平なコイン状となる。扁平形電池２の正極缶１０及び負極缶２０の間に形成される空間内には、電極体４０以外に、非水電解液（図示省略）も封入されている。   As shown in FIG. 3, 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 covering the opening of the positive electrode can 10, and the positive electrode can 10 and the negative electrode can. 20 and a gasket 30 sandwiched between the electrode 20 and the electrode body 40 housed in a space formed between the negative electrode can 10 and the positive electrode can 20. Therefore, the flat battery 2 becomes a flat coin shape by combining the positive electrode can 10 and the negative electrode can 20. In the space formed between the positive electrode can 10 and the negative electrode can 20 of the flat battery 2, in addition to the electrode body 40, a non-aqueous electrolyte (not shown) is also enclosed.

正極缶１０は、ステンレスなどの金属材料からなり、プレス成形によって有底円筒状に形成されている。正極缶１０は、略円形状の底部１１と、その外周に該底部１１と連続して形成される円筒状の周壁部１２とを備える。この周壁部１２は、図３に示す縦断面視で、底部１１の外周端からほぼ垂直に延びるように設けられている。正極缶１０は、負極缶２０との間にガスケット３０を挟んだ状態で、周壁部１２の開口端側が内側に折り曲げられて、該負極缶２０に対してかしめられている。   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 substantially circular bottom portion 11 and a cylindrical peripheral wall portion 12 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 shown in FIG. 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.

負極缶２０も、正極缶１０と同様、ステンレスなどの金属材料からなり、プレス成形によって有底円筒状に形成されている。負極缶２０は、正極缶１０の周壁部１２よりも外形が小さい円筒状の周壁部２２と、その一方の開口を塞ぐ略円形状の平面部２１と、を有する。この周壁部２２も、正極缶１０と同様、縦断面視で、平面部２１に対してほぼ垂直に延びるように設けられている。なお、周壁部２２は、開口端部側の径が平面部２１側の基端部に比べて段状に大きくなるように形成されている。この周壁部２２の段部分に対して、正極缶１０の周壁部１２の開口端側が折り曲げられてかしめられている。   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 substantially circular flat portion 21 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.

ガスケット３０は、ポリプロピレン（ＰＰ）からなる。ガスケット３０は、正極缶１０の周壁部１２と負極缶２０の周壁部２２との間に挟みこまれるように、例えば負極缶２０の周壁部２２にモールド成形されている。なお、ガスケット３０の材料としては、ＰＰに限らず、ポリフェニレンサルファイド（ＰＰＳ）にオレフィン系エラストマーを含有した樹脂組成物や、ポリテトラフルオロエチレン（ＰＦＡ）、ポリアミド系樹脂などを用いてもよい。   The gasket 30 is made of polypropylene (PP). For example, 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.

図３に示すように、電極体４０は、袋状のセパレータ４６内に収容された略円板状の正極４１と、略円板状の負極４２と、を厚み方向に交互に複数、積層してなる。これにより、電極体４０は、全体として略円柱状の形状を有する。また、電極体４０は、両端面が負極になるように、複数の正極４１及び負極４２が積層されている。   As shown in FIG. 3, 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. It becomes. Thereby, the electrode body 40 has a substantially columnar 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.

正極４１は、コバルト酸リチウム等の正極活物質を含有する正極活物質層を、アルミニウム等の金属箔製の正極集電体の両面にそれぞれ配置したものである。   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.

負極４２は、黒鉛等の負極活物質を含有する負極活物質層を、銅等の金属箔製の負極集電体の両面にそれぞれ配置したものである。略円柱状の電極体４０の軸方向両端に位置する負極は、それぞれ、負極集電体が電極体４０の軸方向端部に位置するように、負極集電体の一面側のみに負極活物質層を有する。すなわち、略円柱状の電極体４０は、その両端に負極集電体が露出している。この電極体４０の一方の負極集電体は、該電極体４０が正極缶１０と負極缶２０との間に配置された状態で、該負極缶２０の平面部２１に当接する。電極体４０の他方の負極集電体は、絶縁シート４３を介して正極缶１０の底部１１上に位置づけられる。   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.

セパレータ４６は、平面視で略円形状に形成された袋状の部材であり、略円板状の正極４１を収納可能な大きさに形成されている。セパレータ４６は、絶縁性に優れたポリエチレン製の微多孔性薄膜によって構成されている。このように、セパレータ４６を微多孔性薄膜によって構成することで、リチウムイオンが該セパレータ４６を透過することができる。セパレータ４６は、一枚の微多孔性薄膜のシート材によって正極４１を包み込んで、該シート材の重なっている部分を熱溶着等によって接着することにより形成される。   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 material of a microporous thin film and bonding the overlapping portions of the sheet material by heat welding or the like.

図３に示すように、正極４１の正極集電体には、平面視で該正極集電体の外方に向かって延びる導電性の正極リード４４が一体形成されている。なお、この正極リード４４の正極集電体側も、セパレータ４６によって覆われている。   As shown in FIG. 3, 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.

負極４２の負極集電体には、平面視で該負極集電体の外方に向かって延びる導電性の負極リード４５が一体形成されている。   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.

図３に示すように、正極４１及び負極４２は、各正極４１の正極リード４４が一方側に位置し、且つ、各負極４２の負極リード４５が該正極リード４４とは反対側に位置するように、積層される。   As shown in FIG. 3, the positive electrode 41 and the negative electrode 42 are such that the positive electrode lead 44 of each positive electrode 41 is positioned on one side and the negative electrode lead 45 of each negative electrode 42 is positioned on the opposite side of the positive electrode lead 44. Is laminated.

上述のように複数の正極４１及び負極４２を厚み方向に積層した状態で、複数の正極リード４４は、先端側を厚み方向に重ね合わされて、超音波溶接等によって正極缶１０の底部１１に接続される。これにより、複数の正極リード４４を介して複数の正極４１と正極缶１０の底部１１とが電気的に接続される。一方、複数の負極リード４５も、先端側を厚み方向に重ね合わされて超音波溶接等によって互いに接続される。これにより、複数の負極リード４５を介して複数の負極４２が互いに電気的に接続される。   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.

以上の構成により、扁平形電池２では、正極缶１０が正極端子として機能する一方、負極缶２０が負極端子として機能する。この実施形態の電池ユニット１では、正極缶１０の底部１１及び周壁部１２が扁平形電池２の正極端子として機能し、負極缶２０の平面部２１が扁平形電池２の負極端子として機能する。   With the above configuration, in the flat 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 the battery unit 1 of this embodiment, the bottom portion 11 and the peripheral wall portion 12 of the positive electrode can 10 function as a positive electrode terminal of the flat battery 2, and the flat portion 21 of the negative electrode can 20 functions as a negative electrode terminal of the flat battery 2.

基板３は、図１及び図２に示すように、樹脂材料からなる略円盤状の部材である。基板３は、扁平形電池２の正極缶１０の底部１１の外径よりも大きい外径を有する。基板３は、扁平形電池２の厚み方向に、負極缶２０の平面部２１に対向するように配置される。すなわち、基板３は、後述する概略円筒状のケース５の一方の端部に配置される。   As shown in FIGS. 1 and 2, the substrate 3 is a substantially disk-shaped member made of a resin material. The substrate 3 has an outer diameter larger than the outer diameter of the bottom 11 of the positive electrode can 10 of the flat battery 2. The substrate 3 is disposed in the thickness direction of the flat battery 2 so as to face the flat portion 21 of the negative electrode can 20. That is, the substrate 3 is disposed at one end of a substantially cylindrical case 5 described later.

基板３には、一方の面に、複数の回路部品５１が実装されている。すなわち、基板３において回路部品５１が実装された面が、回路部品実装面である。回路部品５１は、例えば、扁平形電池２を充電する際に充電を制御する充電ＩＣや保護ＩＣ等である。基板３は、回路部品５１が実装された回路部品実装面が扁平形電池２の負極缶２０の平面部２１に対向するように配置される。   A plurality of circuit components 51 are mounted on one surface of the substrate 3. That is, the surface on which the circuit component 51 is mounted on the substrate 3 is the circuit component mounting surface. The circuit component 51 is, for example, a charging IC or a protection IC that controls charging when the flat battery 2 is charged. The substrate 3 is arranged such that the circuit component mounting surface on which the circuit component 51 is mounted faces the flat portion 21 of the negative electrode can 20 of the flat battery 2.

基板３には、他方の面に、正極外部端子５５（外部端子）及び負極外部端子５６（外部端子）が設けられている。すなわち、正極外部端子５５及び負極外部端子５６は、基板３において扁平形電池２とは反対側の面に設けられている。これにより、図１及び図２に示すように、正極外部端子５５及び負極外部端子５６は、電池ユニット１の外方に露出している。   The substrate 3 is provided with a positive external terminal 55 (external terminal) and a negative external terminal 56 (external terminal) on the other surface. That is, the positive external terminal 55 and the negative external terminal 56 are provided on the surface of the substrate 3 opposite to the flat battery 2. Thereby, as shown in FIGS. 1 and 2, the positive electrode external terminal 55 and the negative electrode external terminal 56 are exposed to the outside of the battery unit 1.

正極外部端子５５及び負極外部端子５６は、それぞれ銅箔からなる。本実施形態では、負極外部端子５６は、円盤状の基板３の中央部分に、略円形状に形成されている。正極外部端子５５は、負極外部端子５６を囲むようにリング状に形成されている。   The positive external terminal 55 and the negative external terminal 56 are each made of copper foil. In the present embodiment, the negative electrode external terminal 56 is formed in a substantially circular shape at the center portion of the disk-shaped substrate 3. The positive external terminal 55 is formed in a ring shape so as to surround the negative external terminal 56.

このように、負極外部端子５６を略円形状に形成するとともに、負極外部端子５６を囲むように正極外部端子５５をリング状に形成することで、図示しない機器に電池ユニット１を組み込んだ際に、正極外部端子５５及び負極外部端子５６を機器の端子により確実に接触させることができる。すなわち、上述の構成により、電池ユニット１の周方向の位置に関係なく、機器の端子を電池ユニット１の正極外部端子５５及び負極外部端子５６に電気的に接触させることができる。   In this way, the negative electrode external terminal 56 is formed in a substantially circular shape, and the positive electrode external terminal 55 is formed in a ring shape so as to surround the negative electrode external terminal 56, so that when the battery unit 1 is incorporated in a device (not shown). The positive external terminal 55 and the negative external terminal 56 can be reliably brought into contact with the terminal of the device. That is, with the above-described configuration, the terminal of the device can be brought into electrical contact with the positive external terminal 55 and the negative external terminal 56 of the battery unit 1 regardless of the position in the circumferential direction of the battery unit 1.

なお、正極外部端子を略円形状に形成して、その周りを囲むように負極外部端子を略リング状に形成してもよい。また、負極外部端子及び正極外部端子の形状は、円形状及びリング状以外の形状であってもよい。例えば、正極外部端子及び負極外部端子を、それぞれ矩形状や扇状などの円形以外の形状に形成してもよいし、並べて設けてもよい。   The positive external terminal may be formed in a substantially circular shape, and the negative external terminal may be formed in a substantially ring shape so as to surround it. Moreover, shapes other than circular shape and a ring shape may be sufficient as the shape of a negative electrode external terminal and a positive electrode external terminal. For example, the positive electrode external terminal and the negative electrode external terminal may be formed in a shape other than a circle such as a rectangular shape or a fan shape, or may be provided side by side.

基板３には、扁平形電池２の正極缶１０の底部１１に接続された正極接続端子５７が電気的に接続されているとともに、扁平形電池２の負極缶２０の平面部２１に接続された負極接続端子５８が電気的に接続されている。すなわち、基板３と扁平形電池２とは、正極接続端子５７及び負極接続端子５８によって、電気的に接続されている。   A positive electrode connection terminal 57 connected to the bottom 11 of the positive electrode can 10 of the flat battery 2 is electrically connected to the substrate 3, and is connected to the flat portion 21 of the negative electrode can 20 of the flat battery 2. The negative electrode connection terminal 58 is electrically connected. That is, the substrate 3 and the flat battery 2 are electrically connected by the positive electrode connection terminal 57 and the negative electrode connection terminal 58.

正極接続端子５７及び負極接続端子５８は、それぞれ、平板状の導電性の金属材料を折り曲げることにより形成される。正極接続端子５７及び負極接続端子５８は、それぞれ、一方の端部が扁平形電池２に対して溶接によって接続されているとともに、他方の端部が基板３に半田付けによって接続されている。   The positive electrode connection terminal 57 and the negative electrode connection terminal 58 are each formed by bending a flat conductive metal material. One end of each of the positive electrode connection terminal 57 and the negative electrode connection terminal 58 is connected to the flat battery 2 by welding, and the other end is connected to the substrate 3 by soldering.

受電コイル４は、銅線を巻回することによりリング状に形成される。受電コイル４は、扁平形電池２の外径と同等の外径を有する。受電コイル４は、図示しない充電器の送電コイルから生じる磁束の影響を受けて、電流が流れる。これにより、受電コイル４は、充電器から非接触で電力を受電することができる。すなわち、本実施形態では、電池ユニット１では、非接触充電によって扁平形電池２が充電される。   The power receiving coil 4 is formed in a ring shape by winding a copper wire. The power receiving coil 4 has an outer diameter equivalent to the outer diameter of the flat battery 2. A current flows through the power receiving coil 4 under the influence of magnetic flux generated from a power transmission coil of a charger (not shown). Thereby, the receiving coil 4 can receive electric power non-contactingly from a charger. That is, in the present embodiment, the battery unit 1 charges the flat battery 2 by non-contact charging.

受電コイル４の銅線の端部は、基板３に電気的に接続されている。すなわち、受電コイル４の銅線は、端部から所定長さが該受電コイル４から引き出されて、基板３に半田付けによって接続されている。なお、受電コイル４から引き出された銅線は、図１に示すように、基板３と受電コイル４との間に扁平形電池２を挟み込めるような長さを有する。   The end of the copper wire of the receiving coil 4 is electrically connected to the substrate 3. That is, a predetermined length of the copper wire of the power receiving coil 4 is drawn from the power receiving coil 4 from the end portion, and is connected to the substrate 3 by soldering. Note that the copper wire drawn out from the power receiving coil 4 has such a length that the flat battery 2 can be sandwiched between the substrate 3 and the power receiving coil 4 as shown in FIG.

受電コイル４と扁平形電池２との間には、扁平形電池２に受電コイル４の磁束の影響が及ぶのを防止するための磁性シート７が配置されている。   Between the power receiving coil 4 and the flat battery 2, a magnetic sheet 7 for preventing the flat battery 2 from being affected by the magnetic flux of the power receiving coil 4 is disposed.

（ケース）
次に、ケース５の構成を、図１及び図４を用いて詳細に説明する。 (Case)
Next, the configuration of the case 5 will be described in detail with reference to FIGS. 1 and 4.

ケース５は、樹脂材料からなる概略円筒状の部材である。具体的には、ケース５は、基板３、扁平形電池２及び受電コイル４の積層体の側面を覆う円筒部６１と、該円筒部６１の一方の端部の内周面に沿うように該円筒部６１と一体形成されたフランジ部６２（保持部）とを有する。なお、本実施形態では、ケース５を樹脂材料によって構成しているが、磁性材料によって構成してもよい。   The case 5 is a substantially cylindrical member made of a resin material. Specifically, the case 5 includes a cylindrical portion 61 that covers a side surface of the laminate of the substrate 3, the flat battery 2, and the power receiving coil 4, and an inner peripheral surface of one end portion of the cylindrical portion 61. It has the flange part 62 (holding part) integrally formed with the cylindrical part 61. FIG. In this embodiment, the case 5 is made of a resin material, but may be made of a magnetic material.

フランジ部６２は、円筒部６１の筒軸方向から見て概略リング状に形成されている。また、フランジ部６２は、円筒部６１の前記一方の端部において、円筒部６１の端面から基板３の厚み分だけ該円筒部６１の筒軸方向内方に位置するように設けられている。これにより、図１に示すように、フランジ部６２上で且つ円筒部６１の前記一方の端部に基板３を位置付けることができる。一方、扁平形電池２及び受電コイル４は、フランジ部６２を挟んで基板３とは反対側、すなわち、円筒部６１の内方に配置される。   The flange portion 62 is formed in a substantially ring shape when viewed from the cylinder axis direction of the cylindrical portion 61. Further, the flange portion 62 is provided at the one end portion of the cylindrical portion 61 so as to be located inward in the cylinder axis direction of the cylindrical portion 61 by the thickness of the substrate 3 from the end surface of the cylindrical portion 61. Thereby, as shown in FIG. 1, the substrate 3 can be positioned on the flange portion 62 and at the one end portion of the cylindrical portion 61. On the other hand, the flat battery 2 and the power receiving coil 4 are arranged on the opposite side of the substrate 3 with the flange portion 62 interposed therebetween, that is, on the inside of the cylindrical portion 61.

これにより、フランジ部６２によって、扁平形電池２に対して基板３を所定距離、離間させた状態で配置することができる。この所定距離は、扁平形電池２に対して基板３を配置した状態で、基板３に実装された回路部品５１が扁平形電池２と干渉しないような距離である。よって、上述の構成により、扁平形電池２と基板３との干渉を防止することができる。   Thereby, the board | substrate 3 can be arrange | positioned with the flange part 62 in the state spaced apart with the predetermined distance with respect to the flat battery 2. FIG. The predetermined distance is a distance such that the circuit component 51 mounted on the substrate 3 does not interfere with the flat battery 2 in a state where the substrate 3 is disposed with respect to the flat battery 2. Therefore, the above-described configuration can prevent interference between the flat battery 2 and the substrate 3.

また、フランジ部６２は、扁平形電池２の正極缶１０と負極缶２０との段差、すなわち扁平形電池２の肩部に沿うように、円筒部６１の径方向に所定の寸法を有する。これにより、図１に示すように、扁平形電池２を円筒部６１内に収納した状態で、該扁平形電池２の肩部がフランジ部６２に接触する。よって、扁平形電池２がケース５内で径方向に移動するのを抑制することができる。   Further, the flange portion 62 has a predetermined dimension in the radial direction of the cylindrical portion 61 so as to follow the step between the positive electrode can 10 and the negative electrode can 20 of the flat battery 2, that is, along the shoulder portion of the flat battery 2. Thereby, as shown in FIG. 1, the shoulder portion of the flat battery 2 comes into contact with the flange portion 62 in a state where the flat battery 2 is housed in the cylindrical portion 61. Therefore, it is possible to suppress the flat battery 2 from moving in the radial direction within the case 5.

図４に示すように、フランジ部６２には、互いに対向する位置に、一対の切欠き部６２ａ，６２ａが形成されている。これらの切欠き部６２ａ，６２ａは、フランジ部６２の内周縁から円筒部６１の径方向外方に向かって延びている。切欠き部６２ａ，６２ａは、後述するように、ケース５に対して基板３及び受電コイル４を組み合わせる際に、該受電コイル４が通過する。すなわち、切欠き部６２ａ，６２ａは、受電コイル４を図６のようにフランジ部６２に対して立てた状態で、該受電コイル４が通過可能な寸法に形成されている。詳しくは、切欠き部６２ａ，６２ａは、幅が受電コイル４の厚みよりも大きく、一方の切欠き部６２ａの径方向最外周側と他方の切欠き部６２ａの径方向最外周側との間隔が受電コイル４の外径よりも大きい。   As shown in FIG. 4, the flange portion 62 is formed with a pair of notches 62a and 62a at positions facing each other. These notches 62 a and 62 a extend from the inner peripheral edge of the flange portion 62 toward the radially outer side of the cylindrical portion 61. The notch portions 62a and 62a pass through the power receiving coil 4 when the substrate 3 and the power receiving coil 4 are combined with the case 5 as will be described later. That is, the notches 62a and 62a are formed to have dimensions that allow the power receiving coil 4 to pass in a state where the power receiving coil 4 stands with respect to the flange portion 62 as shown in FIG. Specifically, the notches 62a and 62a have a width larger than the thickness of the power receiving coil 4, and the distance between the radially outermost side of one notch 62a and the radially outermost side of the other notch 62a. Is larger than the outer diameter of the power receiving coil 4.

また、円筒部６１及びフランジ部６２には、該円筒部６１を筒軸方向から見て切欠き部６２ａ，６２ａとは９０度異なる位置に、第１凹部５ａが形成されている。この第１凹部５ａは、円筒部６１の径方向外周側の一部のみを残すように、ケース５の内周側に凹状に形成されている。すなわち、第１凹部５ａは、フランジ部６２だけでなく、円筒部６１の径方向内周側も部分的に除去されたような形状を有する。第１凹部５ａは、後述するように、ケース５内に扁平形電池２を配置する際に、該ケース５に組み合わされた受電コイル４の銅線を収納可能に構成されている。これにより、受電コイル４を扁平形電池２と干渉しないようにケース５の外周側に寄せることが可能となる。   In addition, the first recessed portion 5a is formed in the cylindrical portion 61 and the flange portion 62 at a position that is 90 degrees different from the notches 62a and 62a when the cylindrical portion 61 is viewed from the cylinder axis direction. The first concave portion 5 a is formed in a concave shape on the inner peripheral side of the case 5 so as to leave only a part of the cylindrical portion 61 on the outer peripheral side in the radial direction. That is, the first concave portion 5a has a shape such that not only the flange portion 62 but also the radially inner peripheral side of the cylindrical portion 61 is partially removed. As will be described later, the first recess 5 a is configured to be able to store the copper wire of the power receiving coil 4 combined with the case 5 when the flat battery 2 is disposed in the case 5. As a result, the power receiving coil 4 can be moved toward the outer periphery of the case 5 so as not to interfere with the flat battery 2.

さらに、円筒部６１及びフランジ部６２には、第１凹部５ａと対向する位置に、第２凹部５ｂが形成されている。この第２凹部５ｂも、第１凹部５ａと同様、円筒部６１の径方向外周側の一部のみを残すように、ケース５の内周側に凹状に形成されている。なお、第２凹部５ｂは、円筒部６１の周方向の幅が、第１凹部５ａの幅よりも小さい。   Further, the cylindrical portion 61 and the flange portion 62 are formed with a second concave portion 5b at a position facing the first concave portion 5a. Similarly to the first concave portion 5a, the second concave portion 5b is also formed in a concave shape on the inner peripheral side of the case 5 so as to leave only a part of the cylindrical portion 61 on the outer peripheral side in the radial direction. In addition, the 2nd recessed part 5b has the width | variety of the circumferential direction of the cylindrical part 61 smaller than the width | variety of the 1st recessed part 5a.

第２凹部５ｂ内には、扁平形電池２と基板３とを電気的に接続する正極接続端子５７が配置される。   A positive electrode connection terminal 57 that electrically connects the flat battery 2 and the substrate 3 is disposed in the second recess 5b.

（電池ユニットの製造方法）
次に、上述のような構成を有する電池ユニット１の製造方法を、図５から図８を用いて説明する。 (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.

まず、図５に示すように、受電コイル４の銅線の端部を、回路部品５１が実装され且つ正極外部端子５５及び負極外部端子５６が形成された基板３に対して、電気的に接続する。これにより、受電コイル４及び基板３は、図５に示すように略Ｃ字状に接続される。   First, as shown in FIG. 5, the end of the copper wire of the power receiving coil 4 is electrically connected to the substrate 3 on which the circuit component 51 is mounted and the positive external terminal 55 and the negative external terminal 56 are formed. To do. Thereby, the receiving coil 4 and the board | substrate 3 are connected in a substantially C shape, as shown in FIG.

次に、受電コイル４を、ケース５の切欠き部６２ａ，６２ａに対して該受電コイル４の径方向外方側から挿入する。すなわち、受電コイル４を、ケース５のフランジ部６２に対して交差するように立てた状態で、該フランジ部６２が設けられたケース５の一方の端部から該ケース５の内方に向かって、切欠き部６２ａ，６２ａに挿入する（図６の白抜き矢印参照）。   Next, the power receiving coil 4 is inserted into the notches 62 a and 62 a of the case 5 from the radially outer side of the power receiving coil 4. That is, in a state where the power receiving coil 4 is erected so as to intersect with the flange portion 62 of the case 5, from one end portion of the case 5 provided with the flange portion 62 toward the inside of the case 5. And inserted into the notches 62a and 62a (see white arrows in FIG. 6).

受電コイル４を、フランジ部６２の切欠き部６２ａ，６２ａに対して通過させた後、基板３をフランジ部６２上に配置する。このとき、図７に示すように、受電コイル４がケース５の外周側に位置付けられるように、受電コイル４及び基板３はケース５に対して径方向外方にスライド移動される（図７の白抜き矢印参照）。そして、受電コイル４から回路部品５１に引き出された銅線は、ケース５の第１凹部５ａ内に位置付けられる。   After the power receiving coil 4 is passed through the notches 62 a and 62 a of the flange portion 62, the substrate 3 is disposed on the flange portion 62. At this time, as shown in FIG. 7, the receiving coil 4 and the substrate 3 are slid radially outward with respect to the case 5 so that the receiving coil 4 is positioned on the outer peripheral side of the case 5 (see FIG. 7). (See the white arrow). The copper wire drawn from the power receiving coil 4 to the circuit component 51 is positioned in the first recess 5 a of the case 5.

正極接続端子５７及び負極接続端子５８が取り付けられた扁平形電池２を、ケース５内に収納した後、受電コイル４を扁平形電池２に対して重ね合わせる（図８の矢印参照）。このとき、受電コイル４と扁平形電池２との間に、磁性シート７を挟み込む。また、扁平形電池２に接続された正極接続端子５７及び負極接続端子５８は、基板３に対して半田付けされる。   After the flat battery 2 to which the positive electrode connection terminal 57 and the negative electrode connection terminal 58 are attached is housed in the case 5, the power receiving coil 4 is overlaid on the flat battery 2 (see the arrow in FIG. 8). At this time, the magnetic sheet 7 is sandwiched between the power receiving coil 4 and the flat battery 2. Further, the positive electrode connection terminal 57 and the negative electrode connection terminal 58 connected to the flat battery 2 are soldered to the substrate 3.

そして、ケース５の外周側をフィルム状のチューブ６によって覆うことにより、図１に示す電池ユニット１が得られる。   And the battery unit 1 shown in FIG. 1 is obtained by covering the outer peripheral side of the case 5 with the film-like tube 6.

（実施形態の効果）
この実施形態では、扁平形電池２に対して基板３及び受電コイル４を厚み方向に積層することにより、電池ユニット１を構成する。これにより、非接触充電によって充電される扁平形電池２を備えた電池ユニット１をコンパクトな構成によって実現できる。 (Effect of embodiment)
In this embodiment, the battery unit 1 is configured by stacking the substrate 3 and the power receiving coil 4 in the thickness direction on the flat battery 2. Thereby, the battery unit 1 provided with the flat battery 2 charged by non-contact charge is realizable with a compact structure.

しかも、基板３及び受電コイル４は、扁平形電池２を厚み方向に挟み込むように配置される。よって、基板３と受電コイル４との電気的な接続を確保しつつ、扁平形電池２と基板３との電気的な接続も確保することができる。しかも、受電コイル４が電池ユニット１の筒軸方向の外方側に位置するため、給電コイルで発生する磁束によって受電コイル４に効率良く電流を流すことができる。   Moreover, the substrate 3 and the power receiving coil 4 are arranged so as to sandwich the flat battery 2 in the thickness direction. Therefore, it is possible to ensure electrical connection between the flat battery 2 and the substrate 3 while securing electrical connection between the substrate 3 and the power receiving coil 4. Moreover, since the power receiving coil 4 is located on the outer side of the battery unit 1 in the cylinder axis direction, a current can be efficiently passed through the power receiving coil 4 by the magnetic flux generated by the power feeding coil.

また、上述の構成により、基板３も、電池ユニット１の筒軸方向の外方側に位置するため、正極外部端子５５及び負極外部端子５６が設けられる面を外方側に位置付けることにより、機器との電気的な接続が容易になる。さらに、基板３の回路部品５１が実装された回路実装面は、電池ユニット１の内方側に位置付けられるため、回路部品５１が損傷を受けたり、使用者等が回路部品に触れたりするのを防止できる。   Moreover, since the board | substrate 3 is also located in the outer side of the cylinder axis direction of the battery unit 1 by the above-mentioned structure, by positioning the surface in which the positive electrode external terminal 55 and the negative electrode external terminal 56 are provided in an outer side, apparatus The electrical connection with is easy. Furthermore, since the circuit mounting surface on which the circuit component 51 of the substrate 3 is mounted is positioned on the inner side of the battery unit 1, the circuit component 51 is damaged or a user or the like touches the circuit component. Can be prevented.

扁平形電池２、基板３及び受電コイル４を収納するケース５は、円筒部６１と、該円筒部６１の一方の端部に設けられるフランジ部６２とを有する。そして、フランジ部６２上の該一方の端部側に、基板３を配置する一方、円筒部６１内に扁平形電池２及び受電コイル４を配置する。これにより、フランジ部６２によって、扁平形電池２に対して基板３を所定距離、離間させた状態で配置することができる。よって、扁平形電池２に対して、該扁平形電池２と基板３との間に回路部品５１を配置可能なスペースを形成するように、該基板３を配置することができ、扁平形電池２と回路部品５１との干渉を防止できる。   The case 5 that houses the flat battery 2, the substrate 3, and the power receiving coil 4 includes a cylindrical portion 61 and a flange portion 62 that is provided at one end of the cylindrical portion 61. Then, the substrate 3 is disposed on the one end side on the flange portion 62, while the flat battery 2 and the power receiving coil 4 are disposed in the cylindrical portion 61. Thereby, the board | substrate 3 can be arrange | positioned with the flange part 62 in the state spaced apart with the predetermined distance with respect to the flat battery 2. FIG. Therefore, with respect to the flat battery 2, the substrate 3 can be disposed so as to form a space in which the circuit component 51 can be disposed between the flat battery 2 and the substrate 3. And the circuit component 51 can be prevented from interfering with each other.

また、ケース５のフランジ部６２に、受電コイル４が通過可能な一対の切欠き部６２ａ，６２ａを設けることで、受電コイル４及び基板３を接続した状態でケース５と組み合わせることが可能になる。   Further, by providing the flange portion 62 of the case 5 with a pair of notches 62a and 62a through which the power receiving coil 4 can pass, the case 5 can be combined with the power receiving coil 4 and the substrate 3 in a connected state. .

さらに、ケース５のフランジ部６２に第１凹部５ａを設けることにより、受電コイル４と扁平形電池２との干渉を防止しつつ、該扁平形電池２をケース５内に配置することが可能になる。また、第１凹部５ａ内に、受電コイル４と基板３とを接続する該受電コイル４の銅線を位置付けることができ、電池ユニット１のコンパクト化を図れる。さらに、ケース５のフランジ部６２に第２凹部５ｂを設けることにより、第２凹部５ｂ内に、扁平形電池２と基板３と接続する正極接続端子５７を位置付けることができ、電池ユニット１のコンパクト化を図れる。   Furthermore, by providing the first recess 5 a in the flange portion 62 of the case 5, the flat battery 2 can be disposed in the case 5 while preventing interference between the power receiving coil 4 and the flat battery 2. Become. In addition, the copper wire of the power receiving coil 4 that connects the power receiving coil 4 and the substrate 3 can be positioned in the first recess 5a, and the battery unit 1 can be made compact. Further, by providing the second recessed portion 5b in the flange portion 62 of the case 5, the positive electrode connection terminal 57 for connecting the flat battery 2 and the substrate 3 can be positioned in the second recessed portion 5b, and the battery unit 1 is compact. Can be realized.

（その他の実施形態）
以上、本発明の実施の形態を説明したが、上述した実施の形態は本発明を実施するための例示に過ぎない。よって、上述した実施の形態に限定されることなく、その趣旨を逸脱しない範囲内で上述した実施の形態を適宜変形して実施することが可能である。 (Other embodiments)
Although 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.

前記実施形態では、ケース５において円筒部６１とフランジ部６２とを一体に形成している。しかしながら、円筒部６１とフランジ部６２とを別体で形成してもよい。すなわち、扁平形電池２、基板３及び受電コイル４を収納する収納部材と、扁平形電池２と基板３との間に配置されるスペーサとを別々に設けてもよい。   In the above embodiment, the cylindrical portion 61 and the flange portion 62 are integrally formed in the case 5. However, the cylindrical portion 61 and the flange portion 62 may be formed separately. That is, a storage member that stores the flat battery 2, the substrate 3, and the power receiving coil 4, and a spacer that is disposed between the flat battery 2 and the substrate 3 may be provided separately.

前記実施形態では、ケース５に一対の切欠き部６２ａ，６２ａを設け、銅線によって接続された受電コイル４及び基板３をケース５に対して組み合わせる際に、該切欠き部６２ａ，６２ａに受電コイル４を挿入している。しかしながら、ケースに切欠き部６２ａ，６２ａを設けずに、ケースに対して基板３及び受電コイル４を組み合せた後、該基板３と受電コイル４とを電気的に接続してもよい。また、ケースに切欠き部６２ａ，６２ａを設けずに、第１凹部５ａまたは第２凹部５ｂで円筒部６１を分断して、受電コイル４と基板３とを接続する該受電コイル４の銅線を通過可能な構成にしてもよい。   In the embodiment, when the case 5 is provided with a pair of notches 62a and 62a and the receiving coil 4 and the substrate 3 connected by the copper wire are combined with the case 5, the notches 62a and 62a receive power. The coil 4 is inserted. However, the board 3 and the power receiving coil 4 may be electrically connected after the board 3 and the power receiving coil 4 are combined with the case without providing the notches 62a and 62a. Further, the copper wire of the power receiving coil 4 that connects the power receiving coil 4 and the substrate 3 by dividing the cylindrical portion 61 by the first concave portion 5a or the second concave portion 5b without providing the notches 62a and 62a in the case. You may make it the structure which can pass through.

前記実施形態では、ケース５に、受電コイル４が通過可能な切欠き部６２ａ，６２ａを設けている。しかしながら、ケース５に、基板３が通過可能な切欠き部を設けてもよい。すなわち、ケース５に対して受電コイル４を通過させるのではなく、基板３を通過させてもよい。   In the embodiment, the case 5 is provided with the notches 62a and 62a through which the power receiving coil 4 can pass. However, the case 5 may be provided with a notch through which the substrate 3 can pass. That is, instead of passing the power receiving coil 4 through the case 5, the substrate 3 may be passed through.

前記実施形態では、ケース５に、筒軸方向から見て切欠き部６２ａ，６２ａに対して略９０度の位置に第１凹部５ａを設けるとともに、該第１凹部５ａと対向する位置に第２凹部５ｂを設けている。しかしながら、第１凹部５ａ及び第２凹部５ｂは、それぞれ、受電コイル４の銅線及び正極接続端子５７を収納可能な位置であれば、ケース５のどの位置に設けてもよい。   In the embodiment, the case 5 is provided with the first recess 5a at a position of approximately 90 degrees with respect to the notches 62a and 62a when viewed from the cylinder axis direction, and the second at a position facing the first recess 5a. A recess 5b is provided. However, the first recess 5a and the second recess 5b may be provided at any position of the case 5 as long as the copper wire and the positive electrode connection terminal 57 of the power receiving coil 4 can be accommodated.

前記実施形態では、基板３及び受電コイル４は、扁平形電池２を挟んでその厚み方向に配置されている。しかしながら、扁平形電池２、基板３及び受電コイル４は、該扁平形電池２の厚み方向に積層されていれば、どのような配置であってもよい。   In the said embodiment, the board | substrate 3 and the receiving coil 4 are arrange | positioned in the thickness direction on both sides of the flat battery 2. As shown in FIG. However, the flat battery 2, the substrate 3, and the power receiving coil 4 may be arranged in any manner as long as they are stacked in the thickness direction of the flat battery 2.

前記実施形態では、二次電池としてコイン形状の扁平形電池２を用いているが、この限りではなく、どのような形状の二次電池であってもよい。   In the embodiment, the coin-shaped flat battery 2 is used as the secondary battery. However, the secondary battery is not limited to this, and may be any shape of secondary battery.

前記実施形態では、外装缶を正極缶１０とし、封口缶を負極缶２０としているが、この限りではなく、外装缶を負極缶とし、封口缶を正極缶としてもよい。   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.

本発明による電池ユニットは、充放電可能な扁平形電池及び基板を備えた構成に利用可能である。   The battery unit by this invention can be utilized for the structure provided with the flat battery and board | substrate which can be charged / discharged.

１：電池ユニット、２：扁平形電池、３：基板、４：受電コイル、５：ケース、１０：正極缶（外装缶）、２０：負極缶（封口缶）、５１：回路部品、５５：正極外部端子（外部端子）、５６：負極外部端子（外部端子）、６１：円筒部、６２：フランジ部（保持部）、６２ａ：切欠き部 1: battery unit, 2: flat battery, 3: substrate, 4: receiving coil, 5: case, 10: positive electrode can (outer can), 20: negative electrode can (sealing can), 51: circuit component, 55: positive electrode External terminal (external terminal), 56: negative electrode external terminal (external terminal), 61: cylindrical portion, 62: flange portion (holding portion), 62a: notch

Claims (6)

充放電可能な扁平形電池と、
前記扁平形電池の充電を制御するための回路部品と、外部端子とが実装された基板と、
前記扁平形電池に充電する電力を、給電コイルから非接触で受電する受電コイルとを備え、
前記扁平形電池は、有底筒状の外装缶と、該外装缶に対して開口を覆うように組み合わされる有底筒状の封口缶とを有し、
前記扁平形電池、前記基板及び前記受電コイルは、前記扁平形電池の厚み方向に積層され、
前記回路部品は、前記基板における前記扁平形電池側の面のみに実装され、
前記外部端子は、前記基板における前記扁平形電池とは反対側の面のみに実装されている、電池ユニット。 A chargeable / dischargeable flat battery;
A circuit component for controlling charging of the flat battery, and a board on which external terminals are mounted;
A power receiving coil for receiving the electric power for charging the flat battery in a non-contact manner from a power feeding coil;
The flat battery has a bottomed cylindrical outer can and a bottomed cylindrical sealing can combined with the outer can so as to cover the opening,
The flat battery, the substrate and the power receiving coil are laminated in the thickness direction of the flat battery ,
The circuit component is mounted only on the flat battery side surface of the substrate,
The external terminal is a battery unit that is mounted only on the surface of the substrate opposite to the flat battery. 請求項１に記載の電池ユニットにおいて、
前記基板及び前記受電コイルは、前記扁平型電池を厚み方向に挟んで反対側に配置される、電池ユニット。 The battery unit according to claim 1,
The substrate and the power receiving coil are battery units arranged on opposite sides of the flat battery in the thickness direction. 請求項１または２に記載の電池ユニットにおいて、
前記扁平形電池、前記基板及び前記受電コイルを収納可能なケースをさらに備える、電池ユニット。 The battery unit according to claim 1 or 2 ,
A battery unit further comprising a case capable of housing the flat battery, the substrate, and the power receiving coil. 請求項３に記載の電池ユニットにおいて、
前記ケースは、前記基板を前記扁平形電池に対して所定距離、離間した状態で保持可能な保持部を有する、電池ユニット。 The battery unit according to claim 3 ,
The case is a battery unit having a holding portion capable of holding the substrate in a state of being separated from the flat battery by a predetermined distance. 請求項４に記載の電池ユニットにおいて、
前記ケースは、筒状に形成されていて、
前記保持部は、前記ケースの筒軸方向の一方の端部よりも筒軸方向内方の位置に、該ケースの内方に突出するように設けられていて、
前記基板は、前記ケース内に前記保持部よりも前記一方の端部側に配置され、
前記扁平形電池及び前記受電コイルは、前記ケース内に前記保持部よりも筒軸方向の他方の端部側に配置される、電池ユニット。 The battery unit according to claim 4 ,
The case is formed in a cylindrical shape,
The holding portion is provided to protrude inward of the case at a position inward of the cylindrical axis from one end portion in the cylindrical axis direction of the case,
The substrate is disposed in the case on the one end side than the holding portion,
The said flat battery and the said receiving coil are battery units arrange | positioned in the said case at the other edge part side of a cylinder axial direction rather than the said holding | maintenance part. 請求項５に記載の電池ユニットにおいて、
前記保持部には、前記受電コイルまたは前記基板が通過可能な切欠き部が設けられている、電池ユニット。 The battery unit according to claim 5 , wherein
The battery unit, wherein the holding portion is provided with a notch through which the power receiving coil or the substrate can pass.
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