JP4734826B2 - Assembled battery - Google Patents

Assembled battery Download PDF

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JP4734826B2
JP4734826B2 JP2003361035A JP2003361035A JP4734826B2 JP 4734826 B2 JP4734826 B2 JP 4734826B2 JP 2003361035 A JP2003361035 A JP 2003361035A JP 2003361035 A JP2003361035 A JP 2003361035A JP 4734826 B2 JP4734826 B2 JP 4734826B2
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battery
power generation
stacked
generation element
sheet
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JP2005129267A (en
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鈴木　　勲
岳人 松原
胸永　　訓良
稔 平田
聖治 根本
下薗　　武司
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GS Yuasa International Ltd
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    • 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

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  • Battery Mounting, Suspending (AREA)

Description

本発明は、アルミラミネートシート等のフレキシブルシート製の発電要素収納体を備えた電池及びこの電池を用いた組電池に関するものである。   The present invention relates to a battery including a power generation element housing made of a flexible sheet such as an aluminum laminate sheet and an assembled battery using the battery.

携帯用電子機器等では、発電要素をアルミラミネートシート製の発電要素収納体に収納することにより薄型軽量化を図った電池が従来から使用されている。アルミラミネートシートは、樹脂シートとアルミニウム箔をラミネート状に積層したフレキシブルなシート材であり、扁平状の発電要素をこのアルミラミネートシートで覆い、このアルミラミネートシートが重なり合った周縁部分等を両側から加熱溶着させることにより内部を密閉する。また、この際、端子は、アルミラミネートシートが重なり合い熱溶着された間を通して外部まで引き出されるようにしている。   In portable electronic devices and the like, batteries that have been made thin and lightweight by storing power generation elements in a power generation element storage body made of an aluminum laminate sheet have been conventionally used. The aluminum laminate sheet is a flexible sheet material in which a resin sheet and aluminum foil are laminated in a laminate. The flat power generation element is covered with this aluminum laminate sheet, and the peripheral part where this aluminum laminate sheet overlaps is heated from both sides. The inside is sealed by welding. At this time, the terminals are pulled out to the outside through the aluminum laminate sheets overlapped and thermally welded.

上記のようなフレキシブルな発電要素収納体で覆われた電池を複数個積み重ねて組電池として用いる場合、各電池における発電要素収納体の上下の平坦なシート部分を重ね合わせて積み上げてから端子間の接続作業を行い、その後に組電池ケース等に収容するので、電池を積み重ねる際に位置決めを正確に行うことができず、組み立て作業が煩わしいものになるという問題があった。しかも、組電池ケース等に収容した後も、各電池間の位置は固定されていないので、外部から振動や衝撃を受けると、これらの電池が位置ずれを起こす場合があり、各電池間で相互に接続された端子が引っ張られたり曲げや折れが生じて破損するおそれがあるという問題もあった。また、これらの問題は、１個の電池を電池ケースや機器の電池装着スペース等に収容した場合も同様である。即ち、この電池を電池ケース等にずれて収容すると、この電池から引き出された端子の接続ができなかったり、電池ケース等の蓋が取り付けられない場合が生じ、外部から振動や衝撃を受けた場合にも、この電池ケース等の内部で電池が位置ずれすることにより端子が破損するおそれが生じる。   When a plurality of batteries covered with the flexible power generation element storage body as described above are stacked and used as an assembled battery, the upper and lower flat sheet portions of the power generation element storage bodies in each battery are stacked and stacked, and then between the terminals. Since the connection work is performed and then accommodated in the assembled battery case or the like, there is a problem that the positioning cannot be performed accurately when the batteries are stacked, and the assembly work becomes troublesome. In addition, even after being housed in an assembled battery case, the position between the batteries is not fixed, so when subjected to vibrations or shocks from the outside, these batteries may be misaligned. There is also a problem that the terminal connected to the cable may be damaged by being pulled, bent or broken. These problems are the same when a single battery is accommodated in a battery case or a battery mounting space of a device. That is, if this battery is housed in a battery case or the like, the terminal drawn out from this battery may not be connected, or a cover such as a battery case may not be attached. In addition, there is a risk that the terminal may be damaged when the battery is displaced in the battery case or the like.

なお、上記組電池における問題を解消するために、この組電池の各電池をそれぞれ一対の枠体で挟んで固定するようにした発明が従来から提案されている（例えば、特許文献１参照。）。しかしながら、この場合には、各電池ごとに一対の枠体を用意する必要があり、組電池の部品点数が増加するだけでなく、この枠体の容積や重量分だけ容量密度が低下するという新たな問題が発生する。また、上記１個の電池における問題を解消するために、この電池の発電要素収納体を電池ケースの内面に接着することにより、振動や衝撃によってこの電池が位置ずれするのを防止するようにした発明が従来から提案されている（例えば、特許文献２参照。）。しかしながら、この場合には、接着剤による固定であるために十分な強度が得られなかったり、この接着剤が経年変化や電池の発熱によって劣化し易いという別の問題があった。さらに、発電要素収納体のアルミラミネートシートの表面を粗面化する等して摩擦係数を極めて大きなものにすることにより、振動や衝撃による位置ずれを防止することも考えられるが、この場合にも、電池を積み上げる際の位置決めや電池ケースに収容する場合の位置決めを行うことができないという問題を解消することはできなかった。
特開２００２−３１９３８３号公報 特開平１１−１１１２５０号公報 In addition, in order to solve the problem in the assembled battery, an invention in which each battery of the assembled battery is fixed by being sandwiched between a pair of frames has been proposed (for example, see Patent Document 1). . However, in this case, it is necessary to prepare a pair of frames for each battery, which not only increases the number of parts of the assembled battery, but also reduces the capacity density by the volume and weight of the frame. Problems occur. In addition, in order to solve the problem in the single battery, the battery power generation element housing is adhered to the inner surface of the battery case to prevent the battery from being displaced due to vibration or impact. The invention has been proposed in the past (for example, see Patent Document 2). However, in this case, there is another problem that sufficient strength cannot be obtained because of fixing with an adhesive, and that the adhesive is liable to be deteriorated due to aging or battery heat generation. Furthermore, it is possible to prevent displacement due to vibration and impact by making the friction coefficient extremely large by roughening the surface of the aluminum laminate sheet of the power generation element housing. The problem that the positioning when the batteries are stacked and the positioning when the batteries are accommodated in the battery case cannot be solved.
JP 2002-319383 A JP-A-11-111250

本発明は、フレキシブルシート内に発電要素を収納した電池を電池ケース等に収容する場合や組電池とするために複数個積み重ねる場合に位置決めすることができないという問題と、このような電池が振動や衝撃を受けた場合に位置ずれを起こして端子が破損するのを防止できないという問題を解決しようとするものである。   The present invention has a problem that a battery in which a power generation element is housed in a flexible sheet cannot be positioned when the battery is housed in a battery case or the like, or when a plurality of batteries are stacked to form an assembled battery. It is intended to solve the problem that it is not possible to prevent the terminal from being damaged due to an impact when receiving an impact.

請求項１の発明は、フレキシブルシート製の発電要素収納体を備え、前後方向の一方に正極側の端子が突出し他方に負極側の端子が突出した電池を複数個積み重ねて組み合わせた組電池において、各電池の発電要素収納体における積み重ね方向の一方の面を覆うシート部分に、外側に突出する凸部及び／又は内側に窪む凹部が形成されると共に、他方の面を覆うシート部分に、一方の面の対応する位置の凸部が嵌まり込む凹部及び／又は一方の面の対応する位置の凹部に嵌まり込む凸部が形成され、かつ前記凸部と前記凹部の形状が、前記複数個の電池を直列接続するときには、同じ向きに突出する端子の極性が正負交互となるように積み重ねたときにしか嵌まり込まない形状、又は前記複数個の電池を並列接続するときには、同じ向きに突出する端子の極性が同じとなるように積み重ねたときにしか嵌まり込まない形状、のいずれかの形状であることを特徴とする。 The invention of claim 1 includes a power generating element housed body made flexible sheet in a battery pack positive electrode terminal is terminal on the negative electrode side to protrude the other combined by stacking a plurality of battery protruding in one of the front-rear direction, The sheet portion covering one surface in the stacking direction of the power generation element storage body of each battery has a convex portion protruding outward and / or a concave portion recessed inward, and the sheet portion covering the other surface, A concave portion into which a convex portion at a corresponding position of the surface is fitted and / or a convex portion to be fitted into a concave portion at a corresponding position on one surface is formed, and the shape of the convex portion and the concave portion is the plurality of the concave portions. collision of the battery when connected in series, the shape is not written fits only when the polarity of the terminals projecting in the same direction are stacked so that the alternating positive and negative, or when connected in parallel the plurality of battery, in the same direction Wherein the polarity of the terminals to be is one of the shapes of, not written fits only when stacked so as to have the same.

請求項２の発明は、前記凸部は、前記発電要素収納体の積み重ね方向の一方の面を覆うシート部分において前後左右方向の全周が外側に突出していると共に、前記凹部は他方の面を覆うシート部分において前後左右方向の全周が内側に窪んでいることを特徴とする。 According to a second aspect of the present invention, in the sheet portion covering one surface in the stacking direction of the power generating element storage body, the convex portion protrudes outward in the front-rear and left-right directions, and the concave portion has the other surface. In the covering sheet portion, the entire circumference in the front-rear and left-right directions is recessed inward .

請求項１の発明によれば、電池を電池ケースや機器の電池装着スペース等に収容する場合に、フレキシブルシートの凸部や凹部をこの電池ケース等の内面に形成された凹部や凸部に嵌め込むことにより確実な位置決めを行うことができるようになり、電池の組み立てや装着作業を容易にすることができる。また、このようにして電池を電池ケース等に収容すると、外部から振動や衝撃を受けても位置ずれを起こすようなことがなくなり、フレキシブルシートから引き出された端子が破損するのを防止できるようになる。さらに、このような電池を複数個積み重ねて機器の電池装着スペース等に収容する場合やこれらの電池を組み合わせて組電池として使用する場合にも、電池のフレキシブルシートの凸部や凹部同士を嵌め込むことにより、確実な位置決めを行うと共に振動や衝撃による端子の破損を防止することができるようになる。   According to the first aspect of the present invention, when the battery is accommodated in the battery mounting space or the like of the battery case or device, the convex portion or concave portion of the flexible sheet is fitted into the concave portion or convex portion formed on the inner surface of the battery case or the like. As a result, reliable positioning can be performed, and battery assembly and mounting can be facilitated. In addition, when the battery is housed in the battery case or the like in this manner, the position will not be displaced even when subjected to vibration or impact from the outside, and the terminal pulled out from the flexible sheet can be prevented from being damaged. Become. Furthermore, when a plurality of such batteries are stacked and accommodated in a battery mounting space of the device, or when these batteries are combined and used as an assembled battery, the protrusions and recesses of the battery flexible sheet are fitted into each other. As a result, it is possible to perform reliable positioning and prevent damage to the terminal due to vibration or impact.

請求項２の発明によれば、複数個の電池を積み重ねる際に、例えば下側の電池のフレキシブルシートにおける上方の面を覆うシート部分の凸部や凹部を、上側の電池のフレキシブルシートにおける下方の面を覆うシート部分の凹部や凸部に嵌め込むことにより確実な位置決めを行うことができるようになり、組電池の組み立て作業を容易にすることができる。また、このようにして複数個の電池を積み重ねて組み合わせた組電池は、外部から振動や衝撃を受けても、各電池の間で位置ずれを起こすようなことがなくなるので、これらの各電池間で接続される端子が破損するのを防止できるようになる。   According to the invention of claim 2, when stacking a plurality of batteries, for example, a convex part or a concave part of the sheet part covering the upper surface of the flexible sheet of the lower battery is formed on the lower part of the flexible sheet of the upper battery. By fitting into the concave portion or convex portion of the sheet portion covering the surface, reliable positioning can be performed, and the assembly work of the assembled battery can be facilitated. In addition, an assembled battery in which a plurality of batteries are stacked and combined in this way does not cause positional displacement between the batteries even when subjected to vibration or impact from the outside. It becomes possible to prevent damage to the terminals connected by.

以下、本発明の最良の実施形態について説明する。   Hereinafter, the best embodiment of the present invention will be described.

本実施形態では、アルミラミネートシート製の発電要素収納体を備えた非水電解質二次電池を複数個組み合わせた組電池について説明する。図１に示すように、この非水電解質二次電池１は、扁平状の発電要素を上下２枚の方形のアルミラミネートシート２からなる発電要素収納体に収納したものである。発電要素は、正負の電極をセパレータを介して円筒形に巻回したものを側面から押し潰して扁平状の長円筒形に成形した巻回型のものを用いる。ただし、この発電要素の構成は任意であり、最初から長円筒形に巻回したものや積層型のものを用いることもできる。発電要素収納体のアルミラミネートシート２は、ＰＥＴ（ポリエチレンテレフタレート）等の樹脂シートとＰＥ（ポリエチレン）等の樹脂シートとの間にアルミニウム箔を挟んでラミネート状に積層したフレキシブルシートであり、表面のＰＥＴ層により強度を確保すると共に、中間層のアルミニウム箔によりガスや水分、非水電解液のバリア性を確保し、内面のＰＥ層により熱溶着を容易にしている。   In the present embodiment, an assembled battery in which a plurality of nonaqueous electrolyte secondary batteries including a power generation element housing made of an aluminum laminate sheet is combined will be described. As shown in FIG. 1, this non-aqueous electrolyte secondary battery 1 is a battery in which flat power generation elements are stored in a power generation element storage body composed of two upper and lower rectangular aluminum laminate sheets 2. As the power generation element, a winding type element is used in which a positive and negative electrode wound in a cylindrical shape via a separator is crushed from the side surface and formed into a flat long cylindrical shape. However, the configuration of the power generation element is arbitrary, and a configuration in which the power generation element is wound in a long cylindrical shape from the beginning or a stacked type can be used. The aluminum laminate sheet 2 of the power generation element housing is a flexible sheet laminated in a laminate with an aluminum foil sandwiched between a resin sheet such as PET (polyethylene terephthalate) and a resin sheet such as PE (polyethylene). The PET layer ensures strength, and the intermediate layer aluminum foil ensures gas, moisture, and non-aqueous electrolyte barrier properties, and the inner surface PE layer facilitates thermal welding.

上記発電要素収納体の上下２枚のアルミラミネートシート２は、間に発電要素を挟んで、四方の周縁部をＰＥ層が合わさるようにして重ね合わせられ、上下両側から加熱加圧して全周にわたり熱溶着させることにより内部が密閉される。従って、方形の２枚のアルミラミネートシート２は、四方の周縁部が互いに熱溶着して１枚のシート状に一体化し熱溶着部２ａが形成され、この熱溶着部２ａに囲まれた中央部分が内部の発電要素によって上下に膨らんでそれぞれ発電要素収納部２ｂとなる。また、この非水電解質二次電池１は、上下に積み重ねて組電池とするので、発電要素収納体における発電要素収納部２ｂの上面のアルミラミネートシート２が、この非水電解質二次電池１における積み重ね方向の上方の面を覆うシート部分となり、発電要素収納部２ｂの底面のアルミラミネートシート２が積み重ね方向の下方の面を覆うシート部分となる。そして、これら発電要素収納部２ｂの上面や底面のシート部分が非水電解質二次電池１を積み重ねた際に実際に当接する部分となる。   The two aluminum laminate sheets 2 on the upper and lower sides of the power generation element storage body are stacked with the power generation elements sandwiched therebetween so that the four peripheral edges are aligned with the PE layer, and heated and pressed from both upper and lower sides over the entire circumference. The inside is sealed by heat welding. Therefore, the two aluminum laminate sheets 2 having a square shape are heat-welded at the four peripheral edges and integrated into a single sheet to form a heat-welded portion 2a. The central portion surrounded by the heat-welded portions 2a Bulges up and down by the internal power generation elements to form power generation element storage portions 2b. In addition, since the nonaqueous electrolyte secondary battery 1 is stacked up and down to form an assembled battery, the aluminum laminate sheet 2 on the upper surface of the power generation element storage portion 2b in the power generation element storage body is attached to the nonaqueous electrolyte secondary battery 1. The sheet portion covers the upper surface in the stacking direction, and the aluminum laminate sheet 2 on the bottom surface of the power generation element storage portion 2b becomes the sheet portion covering the lower surface in the stacking direction. And the sheet | seat part of the upper surface and bottom face of these electric power generation element accommodating parts 2b becomes a part which actually contacts when the nonaqueous electrolyte secondary battery 1 is stacked.

また、上記発電要素収納体の２枚のアルミラミネートシート２の熱溶着の際には、発電要素の電極に接続された金属箔からなる端子３を予めこれらのアルミラミネートシート２の重なり合う間を通して外部まで伸ばしておくようにしている。そして、熱溶着によってこれらのアルミラミネートシート２と共にこの端子３も封止して、この端子３の先端部分が外部に引き出されるようにしている。図１では、発電要素を上下から挟んだアルミラミネートシート２の前方の熱溶着部２ａから正又は負極側の端子３が引き出されると共に、この図１では隠れて見えない後方の熱溶着部２ａからも逆極性側の端子３が引き出されている。なお、これらの熱溶着部２ａにおける端子３には、予め薄い樹脂フィルムを熱溶着してこの端子３の金属に馴染ませておくことにより、確実に封止できるようにしている。さらに、この発電要素収納体の内部には、アルミラミネートシート２を完全に封止する前に非水電解液が注入される。   Further, when the two aluminum laminate sheets 2 of the power generation element housing are thermally welded, the terminals 3 made of metal foil connected to the electrodes of the power generation elements are passed through the aluminum laminate sheets 2 in advance through the outside. I try to stretch it out. The terminals 3 are sealed together with the aluminum laminate sheet 2 by heat welding so that the tip portion of the terminals 3 is pulled out. In FIG. 1, the positive or negative terminal 3 is pulled out from the front thermal welding portion 2 a of the aluminum laminate sheet 2 sandwiching the power generation element from above and below, and from the rear thermal welding portion 2 a that is hidden and cannot be seen in FIG. 1. Also, the terminal 3 on the opposite polarity side is drawn out. It should be noted that a thin resin film is preliminarily heat-welded to the terminals 3 in these heat-welded portions 2a so as to be surely sealed by being familiar with the metal of the terminals 3. Further, a non-aqueous electrolyte is injected into the power generation element housing before the aluminum laminate sheet 2 is completely sealed.

上記発電要素収納体のアルミラミネートシート２は、ある程度フレキシブルではあるがほとんど伸びが生じないので、収納する発電要素によって膨らむことになる発電要素収納部２ｂを事前に型付けするために、予め絞り加工が施される。しかも、本実施形態では、この絞り加工の際に、上方のアルミラミネートシート２における上方に膨らんだ発電要素収納部２ｂの上面に、中央部を前後方向の端まで至る幅広の溝状に下方に窪ませた凹部２ｃを形成している。また、下方のアルミラミネートシート２における下方に膨らんだ発電要素収納部２ｂの底面にも、中央部を前後方向の端まで至る幅広の畦状に下方に突出させた凸部２ｄを形成している。そして、これらの凹部２ｃと凸部２ｄは、この凸部２ｄの突出部分が凹部２ｃの窪みに嵌合するような幅で形成される。なお、アルミラミネートシート２自体はある程度フレキシブルなものであるが十分に腰のある材質であるため、絞り加工によって凹部２ｃと凸部２ｄのエッジ部分を僅かな間隔で折り曲げたように成形して型付けすれば、発電要素を収納して熱溶着した後も、これら凹部２ｃと凸部２ｄの形状、特にエッジ部分の形状は確実に維持される。   The aluminum laminate sheet 2 of the power generation element storage body is flexible to some extent but hardly stretches. Therefore, in order to pre-type the power generation element storage portion 2b that will be inflated by the power generation element to be stored, a drawing process is performed in advance. Applied. Moreover, in this embodiment, during this drawing process, the upper surface of the power generation element storage portion 2b swelled upward in the upper aluminum laminate sheet 2 is formed downward in the shape of a wide groove extending to the end in the front-rear direction. A recessed portion 2c is formed. Also, a convex portion 2d is formed on the bottom surface of the power generation element storage portion 2b swelled downward in the lower aluminum laminate sheet 2 so that the central portion protrudes downward in a wide bowl shape extending to the end in the front-rear direction. . And these recessed part 2c and convex part 2d are formed in the width | variety which the protrusion part of this convex part 2d fits into the hollow of the recessed part 2c. The aluminum laminate sheet 2 itself is flexible to a certain extent, but is a sufficiently stiff material, so that the edge portions of the concave portion 2c and the convex portion 2d are formed by bending so as to be bent at a slight interval. Then, even after the power generation element is accommodated and heat-welded, the shape of the concave portion 2c and the convex portion 2d, particularly the shape of the edge portion, is reliably maintained.

上記構成の非水電解質二次電池１を複数個上下に積み重ねると、下側の非水電解質二次電池１における発電要素収納体の発電要素収納部２ｂの上面を覆うアルミラミネートシート２に、上側の非水電解質二次電池１における発電要素収納体の発電要素収納部２ｂの底面を覆うアルミラミネートシート２が載置されることになる。そして、従来であれば、これら発電要素収納部２ｂの上面や底面のアルミラミネートシート２が平坦であったために、単に載置されるだけで位置決めや固定ができなかった。しかしながら、本実施形態の場合には、上側の非水電解質二次電池１の底面のアルミラミネートシート２の凸部２ｄが下側の非水電解質二次電池１の上面のアルミラミネートシート２の凹部２ｃに嵌まり込むので、上下の非水電解質二次電池１の左右方向の位置を揃えると共に位置ずれを防止することもできるようになる。   When a plurality of nonaqueous electrolyte secondary batteries 1 having the above-described configuration are stacked one above the other, an aluminum laminate sheet 2 covering the upper surface of the power generation element storage portion 2b of the power generation element storage body in the lower nonaqueous electrolyte secondary battery 1 is placed on the upper side. The aluminum laminate sheet 2 that covers the bottom surface of the power generation element storage portion 2b of the power generation element storage body in the nonaqueous electrolyte secondary battery 1 is placed. And conventionally, since the aluminum laminate sheets 2 on the upper surface and the bottom surface of these power generation element storage portions 2b were flat, they could not be positioned or fixed simply by being placed. However, in the case of this embodiment, the convex portion 2d of the aluminum laminate sheet 2 on the bottom surface of the upper nonaqueous electrolyte secondary battery 1 is the concave portion of the aluminum laminate sheet 2 on the upper surface of the lower nonaqueous electrolyte secondary battery 1. Since it fits in 2c, the position of the upper and lower nonaqueous electrolyte secondary batteries 1 in the left-right direction can be aligned, and positional displacement can be prevented.

従って、本実施形態によれば、複数個の非水電解質二次電池１を上下に積み重ねる組電池の組み立て作業の際に、上側の非水電解質二次電池１の凸部２ｄを下側の非水電解質二次電池１の凹部２ｃに嵌め込むことができるので、これらの非水電解質二次電池１の左右方向の位置決めを容易に行うことができるようになる。また、これらの非水電解質二次電池１を積み重ねて組み合わせた組電池は、外部から振動や衝撃を受けても、個々の非水電解質二次電池１が位置ずれを起こすようなことがなくなる。つまり、左右方向には、凹部２ｃに凸部２ｄが噛み合うことにより位置ずれを防止し、前後方向にも、これら凹部２ｃと凸部２ｄの嵌め合いによる摩擦抵抗の増大によって位置ずれを防止することができる。このため、各非水電解質二次電池１間で接続された端子３が、これらの非水電解質二次電池１の位置ずれによって引っ張られたり曲げや折れを生じて破損するのを防止することができるようになる。   Therefore, according to the present embodiment, when assembling the assembled battery in which a plurality of nonaqueous electrolyte secondary batteries 1 are stacked one above the other, the convex portion 2d of the upper nonaqueous electrolyte secondary battery 1 is placed on the lower non-aqueous electrolyte secondary battery 1. Since it can be fitted into the recess 2c of the water electrolyte secondary battery 1, it is possible to easily position the non-aqueous electrolyte secondary battery 1 in the left-right direction. In addition, the assembled battery in which these nonaqueous electrolyte secondary batteries 1 are stacked and combined does not cause individual nonaqueous electrolyte secondary batteries 1 to be displaced even when subjected to vibration or impact from the outside. In other words, in the left-right direction, the convex portion 2d meshes with the concave portion 2c to prevent displacement, and in the front-back direction, the positional displacement is prevented by increasing the frictional resistance due to the fitting of the concave portion 2c and the convex portion 2d. Can do. For this reason, it is possible to prevent the terminals 3 connected between the non-aqueous electrolyte secondary batteries 1 from being pulled or bent or bent due to misalignment of the non-aqueous electrolyte secondary batteries 1 to be damaged. become able to.

なお、上記実施形態では、発電要素収納体のアルミラミネートシート２に前後方向の溝状の凹部２ｃと畦状の凸部２ｄを形成したために、積み重ねる非水電解質二次電池１の前後方向の位置決めができず、振動等によるこの前後方向への位置ずれも確実に防ぐことができない。そこで、例えば図２に示すように、下側の非水電解質二次電池１の発電要素収納部２ｂの上面を覆うアルミラミネートシート２の中央には、前後左右方向の全周がこの発電要素収納部２ｂの上面より下方に窪む凹部２ｃを形成すると共に、上側の非水電解質二次電池１の発電要素収納部２ｂの底面を覆うアルミラミネートシート２の中央には、前後左右方向の全周がこの発電要素収納部２ｂの底面より下方に突出する凸部２ｄを形成するようにすれば、左右方向だけでなく前後方向の位置決めもできるようになり、振動等によるこの前後方向への位置ずれも確実に防ぐことができるようになる。   In the above embodiment, the front and rear positioning of the nonaqueous electrolyte secondary battery 1 to be stacked is formed because the groove-shaped concave portion 2c and the hook-shaped convex portion 2d are formed in the aluminum laminate sheet 2 of the power generation element housing. This positional displacement in the front-rear direction due to vibration or the like cannot be reliably prevented. Therefore, for example, as shown in FIG. 2, the entire circumference in the front-rear and left-right directions is placed in the center of the aluminum laminate sheet 2 covering the upper surface of the power generation element storage portion 2 b of the lower nonaqueous electrolyte secondary battery 1. The center of the aluminum laminate sheet 2 that forms a recess 2c that is recessed below the top surface of the portion 2b and covers the bottom surface of the power generating element storage portion 2b of the upper nonaqueous electrolyte secondary battery 1 However, if the convex portion 2d that protrudes downward from the bottom surface of the power generation element storage portion 2b is formed, positioning in the front-rear direction as well as the left-right direction can be performed. Can be surely prevented.

しかも、この図２に示すように、上下の非水電解質二次電池１を特定の方向に向けた状態でなければ凸部２ｄが凹部２ｃに嵌まり込まないような形状（図２では略台形）にしておけば、端子３が前後逆になって積み重ねられるという作業ミスをなくすこともできる。即ち、本実施形態のように前後方向に正極側と負極側の端子３を引き出した非水電解質二次電池１の場合、直列接続するときには、同じ向きに突出する端子３の極性が正負交互となるように積み重ね、並列接続するときには、同じ向きに突出する端子３の極性が同じとなるように積み重ねるので、この非水電解質二次電池１の前後の向きを間違って積み重ねると組電池の接続ができないことになる。そこで、例えば図２では、直列接続を行うために、各非水電解質二次電池１の凹部２ｃの略台形の短辺側に正極側の端子３が突出し、凸部２ｄの略台形の短辺側に負極側の端子３が突出するというように、これらの凹部２ｃと凸部２ｄの略台形の向きが前後逆になるように形成することにより、上下に積み重ねた非水電解質二次電池１の端子３の極性が交互に変わるようにして、この作業ミスを防ぐようにしている。また、並列接続を行う場合には、これら凹部２ｃと凸部２ｄの略台形の向きを揃えるように形成すればよい。   In addition, as shown in FIG. 2, the convex portion 2d does not fit into the concave portion 2c unless the upper and lower nonaqueous electrolyte secondary batteries 1 are oriented in a specific direction (in FIG. 2, a substantially trapezoidal shape). ), It is possible to eliminate an operation error that the terminals 3 are stacked in the reverse direction. That is, in the case of the nonaqueous electrolyte secondary battery 1 in which the positive electrode side and the negative electrode side terminal 3 are pulled out in the front-rear direction as in the present embodiment, the polarity of the terminal 3 protruding in the same direction is alternately positive and negative when connected in series. When the non-aqueous electrolyte secondary battery 1 is stacked in the wrong direction, the connection of the assembled battery is caused because the terminals 3 projecting in the same direction are stacked so that the polarities of the terminals 3 are the same. It will not be possible. Thus, for example, in FIG. 2, in order to perform series connection, the positive-side terminal 3 protrudes from the substantially trapezoidal short side of the recess 2 c of each nonaqueous electrolyte secondary battery 1, and the approximately trapezoidal short side of the projection 2 d. The non-aqueous electrolyte secondary battery 1 stacked up and down is formed by forming the concave portions 2c and the convex portions 2d so that the directions of the substantially trapezoids are reversed in the front and rear direction so that the negative electrode side terminal 3 protrudes on the side. The polarity of the terminal 3 is alternately changed to prevent this operation error. Moreover, when performing parallel connection, what is necessary is just to form so that the direction of the substantially trapezoid of these recessed parts 2c and the convex parts 2d may be equalized.

また、これらの凹部２ｃと凸部２ｄの形状は、図１に示すような溝状と畦状や図２に示すような略台形状に限らず、長方形状や円形状、その他の任意の形状とすることができる。さらに、凸部２ｄが凹部２ｃに嵌まり込めばよいので、同じ形状である必要もない。即ち、例えば凹部２ｃが正方形で凸部２ｄがこれに内接するような円形であってもよい。さらに、これらの凹部２ｃや凸部２ｄは、１箇所ずつではなく、複数箇所ずつ形成することもでき、例えば同じ発電要素収納部２ｂの上面に凹部２ｃと凸部２ｄを混在して形成することもできる。そして、このような凹部２ｃと凸部２ｄを非対称的な形状にしたり、発電要素収納部２ｂの上面や底面の中央以外の位置に配置したり、複数箇所の凹部２ｃや凸部２ｄを非対称的な位置に配置する等により、図２に示した略台形状の凹部２ｃと凸部２ｄの場合と同様に、積み重ねる非水電解質二次電池１の向きを制限して作業ミスをなくすようにすることができる。   Further, the shape of the concave portion 2c and the convex portion 2d is not limited to the groove shape and the bowl shape as shown in FIG. 1 or the substantially trapezoidal shape as shown in FIG. 2, but is a rectangular shape, a circular shape, or any other shape. It can be. Furthermore, since the convex part 2d should just fit in the recessed part 2c, it does not need to be the same shape. In other words, for example, the concave portion 2c may be square and the convex portion 2d may be inscribed in the circle. Furthermore, these concave portions 2c and convex portions 2d can be formed at a plurality of locations instead of one at a time. For example, the concave portions 2c and the convex portions 2d are mixedly formed on the upper surface of the same power generation element storage portion 2b. You can also. And such a recessed part 2c and the convex part 2d are made into an asymmetrical shape, arrange | positioned in positions other than the center of the upper surface and bottom face of the electric power generation element accommodating part 2b, or several recessed parts 2c and the convex part 2d are asymmetrical. As in the case of the substantially trapezoidal concave portion 2c and convex portion 2d shown in FIG. 2, the orientation of the nonaqueous electrolyte secondary battery 1 to be stacked is limited to eliminate work mistakes. be able to.

さらに、上記実施形態では、これらの凹部２ｃや凸部２ｄが機械的に噛み合って位置決めを正確に行うことができるようにするために、発電要素収納部２ｂの上面や底面から垂直に突出したり窪む場合を示したが、エッジ部分がなだらかに突出したり窪むようになっていてもよい。即ち、例えばこれらの凹部２ｃや凸部２ｄが半球状や球面の一部の形状からなる突起や窪みであってもよい。   Further, in the above-described embodiment, the concave portions 2c and the convex portions 2d are mechanically engaged with each other so that the positioning can be performed accurately, so that the power generating element storage portion 2b protrudes vertically from the top surface or the bottom surface. However, the edge portion may be gently protruded or recessed. That is, for example, the concave portion 2c and the convex portion 2d may be protrusions or depressions having a hemispherical shape or a partial spherical shape.

さらに、上記実施形態では、これらの凹部２ｃや凸部２ｄを熱溶着前のアルミラミネートシート２の絞り加工時に形成する場合を示したが、形成方法は任意であり、形成時期も可能であれば熱溶着後であってもよい。   Furthermore, in the above-described embodiment, the case where the concave portions 2c and the convex portions 2d are formed at the time of drawing the aluminum laminate sheet 2 before heat welding is shown. However, if the formation method is arbitrary and the formation time is also possible. It may be after heat welding.

また、上記実施形態では、２枚のアルミラミネートシート２を重ね合わせて発電要素収納体とする場合を示したが、例えば１枚のアルミラミネートシートを２つ折りにしたり、封筒のように両端部と中央部で重ね合わせるようにした間に発電要素を収納してもよく、予めアルミラミネートシートを袋状にした発電要素収納体の中に発電要素を収納してもよい。さらに、このアルミラミネートシートの重ね合わせ部分は、熱溶着に代えて、接着等の他の方法により封止固着することもできる。さらに、上記実施形態では、発電要素収納体にアルミラミネートシートを用いる場合を示したが、十分な強度とバリア性を確保し確実な封止が可能なフレキシブルシートであれば材質は任意であり、ラミネートシートでなくてもよい。   Moreover, in the said embodiment, although the case where the two aluminum laminate sheets 2 were piled up and it was set as the electric power generation element storage body was shown, for example, one sheet of aluminum laminate sheet is folded in half, The power generation element may be accommodated while being overlapped at the center, or the power generation element may be accommodated in a power generation element storage body in which an aluminum laminate sheet is formed in a bag shape in advance. Furthermore, the overlapped portion of the aluminum laminate sheet can be sealed and fixed by other methods such as adhesion instead of heat welding. Furthermore, in the above-described embodiment, the case where an aluminum laminate sheet is used for the power generation element housing is shown, but the material is arbitrary as long as it is a flexible sheet that ensures sufficient strength and barrier properties and can be reliably sealed, It may not be a laminate sheet.

また、上記実施形態では、非水電解質二次電池１を上下方向に積み重ねる場合を例示したが、例えば前後方向や左右方向に積み重ねてもよく、このように積み重ねた複数個の非水電解質二次電池１を２列以上並べて配置してもよい。さらに、上記実施形態では、非水電解質二次電池１について示したが、本発明は電池の種類は問わない。   Moreover, in the said embodiment, although the case where the nonaqueous electrolyte secondary battery 1 was stacked in the up-down direction was illustrated, for example, you may stack in the front-back direction or the left-right direction, and several non-aqueous electrolyte secondary stacked in this way The batteries 1 may be arranged in two or more rows. Furthermore, in the said embodiment, although shown about the nonaqueous electrolyte secondary battery 1, the kind of battery does not ask | require this invention.

また、上記実施形態では、複数の電池を積み重ねた組電池の場合について説明したが、電池ケースや機器の電池装着スペース等に収容する１個以上の電池にも同様に実施可能である。この場合、複数の電池間では、凹部２ｃに凸部２ｄを嵌め込むことにより上記組電池の場合と同様となり、積み重ねた両端の電池や１個だけ収容する電池の場合には、電池ケース等の内面に対応する凹部や凸部を形成しておけば同様となる。しかも、これは組電池の組電池ケースの内面に凹部や凸部を形成した場合も同様である。   Moreover, although the said embodiment demonstrated the case of the assembled battery which laminated | stacked the some battery, it can implement similarly to the 1 or more battery accommodated in the battery mounting space etc. of a battery case or an apparatus. In this case, between the plurality of batteries, the protrusion 2d is fitted into the recess 2c, which is the same as in the case of the assembled battery. In the case of batteries stacked at both ends or only one battery, a battery case, etc. It is the same if a concave portion or a convex portion corresponding to the inner surface is formed. Moreover, the same applies to the case where a concave portion or a convex portion is formed on the inner surface of the assembled battery case of the assembled battery.

本発明の一実施形態を示すものであって、３個の非水電解質二次電池を積み重ねる組電池の組み立て作業工程を示す斜視図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating an assembling process of an assembled battery in which three nonaqueous electrolyte secondary batteries are stacked according to an embodiment of the present invention. 本発明の他の実施形態を示すものであって、３個の非水電解質二次電池を積み重ねる組電池の組み立て作業工程を示す斜視図である。FIG. 10 is a perspective view showing another embodiment of the present invention and showing an assembly work process of an assembled battery in which three nonaqueous electrolyte secondary batteries are stacked.

符号の説明Explanation of symbols

１ 非水電解質二次電池
２ アルミラミネートシート
２ｂ 発電要素収納部
２ｃ 凹部
２ｄ 凸部 DESCRIPTION OF SYMBOLS 1 Nonaqueous electrolyte secondary battery 2 Aluminum laminate sheet 2b Electric power generation element storage part 2c Concave part 2d Convex part

Claims (2)

フレキシブルシート製の発電要素収納体を備え、前後方向の一方に正極側の端子が突出し他方に負極側の端子が突出した電池を複数個積み重ねて組み合わせた組電池において、
各電池の発電要素収納体における積み重ね方向の一方の面を覆うシート部分に、外側に突出する凸部及び／又は内側に窪む凹部が形成されると共に、他方の面を覆うシート部分に、一方の面の対応する位置の凸部が嵌まり込む凹部及び／又は一方の面の対応する位置の凹部に嵌まり込む凸部が形成され、かつ前記凸部と前記凹部の形状が、前記複数個の電池を直列接続するときには、同じ向きに突出する端子の極性が正負交互となるように積み重ねたときにしか嵌まり込まない形状、又は前記複数個の電池を並列接続するときには、同じ向きに突出する端子の極性が同じとなるように積み重ねたときにしか嵌まり込まない形状、のいずれかの形状であることを特徴とする組電池。 Includes a power generating element housed body made flexible sheet in a battery pack positive electrode terminal is combined by stacking a plurality of battery terminals on the negative electrode side to protrude the other projecting in one of the front-rear direction,
The sheet portion covering one surface in the stacking direction of the power generation element storage body of each battery has a convex portion protruding outward and / or a concave portion recessed inward, and the sheet portion covering the other surface, A concave portion into which a convex portion at a corresponding position of the surface is fitted and / or a convex portion to be fitted into a concave portion at a corresponding position on one surface is formed, and the shape of the convex portion and the concave portion is the plurality of the concave portions. When connecting the batteries in series, the terminals that protrude in the same direction will only fit when stacked so that the polarity of the terminals will alternate between positive and negative , or when connecting the plurality of batteries in parallel, it will protrude in the same direction. A battery pack having a shape that fits only when stacked so that the polarities of the terminals to be stacked are the same. 前記凸部は、前記発電要素収納体の積み重ね方向の一方の面を覆うシート部分において前後左右方向の全周が外側に突出していると共に、前記凹部は他方の面を覆うシート部分において前後左右方向の全周が内側に窪んでいることを特徴とする請求項１に記載の組電池。 The convex portion protrudes outward in the front / rear / left / right direction in the seat portion covering one surface in the stacking direction of the power generating element housing, and the concave portion is in the front / rear / left / right direction in the seat portion covering the other surface. The assembled battery according to claim 1, wherein the entire circumference of the battery is recessed inward.
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