JP5470754B2 - Non-aqueous electrolyte electricity storage device with lead member - Google Patents

Non-aqueous electrolyte electricity storage device with lead member Download PDF

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JP5470754B2
JP5470754B2 JP2008160035A JP2008160035A JP5470754B2 JP 5470754 B2 JP5470754 B2 JP 5470754B2 JP 2008160035 A JP2008160035 A JP 2008160035A JP 2008160035 A JP2008160035 A JP 2008160035A JP 5470754 B2 JP5470754 B2 JP 5470754B2
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insulating film
lead member
packaging material
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JP2010003485A (en
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圭太郎 宮澤
浩介 田中
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Sumitomo Electric Industries 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
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本発明は、包材で密閉した非水電解質蓄電デバイスに用いられるリード部材、そのリード部材付非水電解質蓄電デバイス及びリード部材の製造方法に関する。   The present invention relates to a lead member used for a nonaqueous electrolyte electricity storage device sealed with a packaging material, a nonaqueous electrolyte electricity storage device with a lead member, and a method for producing the lead member.

携帯電話やデジタルオーディオプレーヤなどの小型電子機器に用いられるシート状非水電解質蓄電デバイス用リード線部材に関して、テープ状のオレフィン系樹脂フィルムを、リボン状金属の送り方向に直交して供給し、プレス機で加圧しつつ加熱することによりリボン状金属に接着する技術が知られている（例えば、特許文献１参照）。   For lead wire members for sheet-like non-aqueous electrolyte electricity storage devices used in small electronic devices such as mobile phones and digital audio players, tape-like olefin-based resin films are supplied perpendicular to the ribbon metal feed direction and pressed A technique for bonding to a ribbon-like metal by heating while pressing with a machine is known (for example, see Patent Document 1).

特開２００１−２９７７４９号公報Japanese Patent Application Laid-Open No. 2001-277749

小型電子機器に用いられる非水電解質蓄電デバイスには、正極、負極及び電解質媒体を包材で被覆し、リード部材をこの包材から一部突出させた状態として包材を密閉することにより製造されるものがある。このような非水電解質蓄電デバイスの場合、電子機器内の収納スペースへの収納のため、リード部材を折り曲げた状態で使用されることがある。   Non-aqueous electrolyte electricity storage devices used in small electronic devices are manufactured by covering a positive electrode, a negative electrode, and an electrolyte medium with a packaging material, and sealing the packaging material with the lead member partially protruding from the packaging material. There is something. In the case of such a nonaqueous electrolyte electricity storage device, the lead member may be used in a folded state for storage in a storage space in the electronic device.

ところで、リード部材に貼る絶縁フィルムは絶縁性を確保する上である程度の厚さが必要である。このため、リード部材の絶縁フィルム位置での折り曲げは、加工性が悪く、また、絶縁フィルムの弾性によって折り曲げが元に戻ってしまうことがあり、形状保持性が悪かった。これに対して、リード部材を絶縁フィルムが無い金属箔の位置で折り曲げると、形状保持性は良いものの、金属箔が絶縁フィルムで保護されていないため、破断を生じる可能性があり、信頼性に劣ってしまう。   By the way, the insulating film to be attached to the lead member needs to have a certain thickness in order to ensure insulation. For this reason, the bending of the lead member at the position of the insulating film is poor in workability, and the bending may return to the original state due to the elasticity of the insulating film, resulting in poor shape retention. On the other hand, if the lead member is bent at the position of the metal foil without the insulating film, the shape retainability is good, but the metal foil is not protected by the insulating film, so there is a possibility of breakage, and reliability. It will be inferior.

そこで、本発明の目的は、形状保持性と信頼性とを両立できるリード部材、リード部材付非水電解質蓄電デバイス及びリード部材の製造方法を提供することにある。   Therefore, an object of the present invention is to provide a lead member, a non-aqueous electrolyte electricity storage device with a lead member, and a method for manufacturing the lead member that can achieve both shape retention and reliability.

上記課題を解決することのできる本発明のリード部材は、帯状の金属箔の長さ方向の中間部に、第一の絶縁フィルムが前記金属箔の一方の側面から接着され、第二の絶縁フィルムが前記金属箔の他方の側面から接着されて、前記第一の絶縁フィルムと前記第二の絶縁フィルムとが貼り合わされてなるリード部材であって、
前記第一の絶縁フィルムの前記金属箔の長さ方向の一方の端部が、前記第二の絶縁フィルムの同側の端部からずらされていることを特徴とする。 In the lead member of the present invention capable of solving the above-mentioned problems, a first insulating film is bonded from one side surface of the metal foil to an intermediate portion in the length direction of the strip-shaped metal foil, and the second insulating film Is a lead member that is bonded from the other side surface of the metal foil, and the first insulating film and the second insulating film are bonded together,
One end of the first insulating film in the length direction of the metal foil is shifted from the same end of the second insulating film.

また、本発明のリード部材付非水電解質蓄電デバイスは、本発明のリード部材が接続された正極及び負極が電解質媒体とともに包材で密封され、前記リード部材が前記第一の絶縁フィルムと前記第二の絶縁フィルムで前記包材に密着されてなるリード部材付非水電解質蓄電デバイスであって、
前記リード部材は、前記第一の絶縁フィルムの端部が前記包材から突出し、前記第二の絶縁フィルムの端部が前記包材から前記第一の絶縁フィルムよりも小さく突出しているかまたは前記包材の端部と同位置にあることを特徴とする。
なお、非水電解質蓄電デバイスとしては、例えばリチウムイオン電池等の非水電解質電池や電気二重層キャパシタ等の非水電解質キャパシタが挙げられる。非水電解質蓄電デバイスは、非水電解質媒体を備えており、非水電解質媒体としては、非水溶媒に電解質（例えばリチウム化合物）を溶解した非水電解液やポリエチレンオキサイド、ポリプロピレンオキサイド等からなる固体電解質が用いられる。 In the non-aqueous electrolyte electricity storage device with a lead member of the present invention, the positive electrode and the negative electrode to which the lead member of the present invention is connected are sealed together with an electrolyte medium with a packaging material, and the lead member is the first insulating film and the first member. A non-aqueous electrolyte electricity storage device with a lead member formed in close contact with the packaging material with two insulating films,
In the lead member, an end portion of the first insulating film protrudes from the packaging material, and an end portion of the second insulating film protrudes smaller than the first insulating film from the packaging material or the packaging member. It is characterized by being in the same position as the end of the material.
In addition, as a nonaqueous electrolyte electrical storage device, nonaqueous electrolyte capacitors, such as nonaqueous electrolyte batteries, such as a lithium ion battery, and an electric double layer capacitor, are mentioned, for example. The non-aqueous electrolyte electricity storage device includes a non-aqueous electrolyte medium. As the non-aqueous electrolyte medium, a non-aqueous electrolyte solution in which an electrolyte (for example, a lithium compound) is dissolved in a non-aqueous solvent, a solid made of polyethylene oxide, polypropylene oxide, or the like. An electrolyte is used.

また、前記リード部材が、前記第二の絶縁フィルムの前記端部の位置で折り曲げられていることが好ましい。   Moreover, it is preferable that the said lead member is bend | folded in the position of the said edge part of a said 2nd insulating film.

また、本発明のリード部材の製造方法は、帯状の金属箔の長さ方向の中間部に、第一の絶縁フィルムを前記金属箔の一方の側面から接着し、第二の絶縁フィルムを前記金属箔の他方の側面から接着して、前記第一の絶縁フィルムと前記第二の絶縁フィルムとを貼り合わせるリード部材の製造方法であって、
前記第一の絶縁フィルムの前記金属箔の長さ方向の一方の端部を、前記第二の絶縁フィルムの同側の端部からずらして前記第一の絶縁フィルムと前記第二の絶縁フィルムとを貼り合わせることを特徴とする。 In the method for producing a lead member of the present invention, the first insulating film is bonded from one side surface of the metal foil to the middle portion in the length direction of the strip-shaped metal foil, and the second insulating film is attached to the metal. Adhering from the other side surface of the foil, a method for producing a lead member for bonding the first insulating film and the second insulating film,
One end of the metal foil of the first insulating film in the length direction is shifted from the same end of the second insulating film, and the first insulating film and the second insulating film It is characterized by sticking together.

本発明によれば、第一の絶縁フィルムの金属箔の長さ方向の一方の端部が、第二の絶縁フィルムの同側の端部からずらされているので、金属箔と片側のみの絶縁フィルムとを折り曲げることが可能となる。よって、金属箔と両面側の絶縁フィルムとを折り曲げる場合と比べて加工性が良く、しかも、絶縁フィルムの弾性によって折り曲げが元に戻ることを抑制できる。また、金属箔のみを折り曲げる場合と比べて、絶縁フィルムによって金属箔が保護されているため、破断を抑制できる。これにより、形状保持性と信頼性とを両立できる。   According to the present invention, since one end in the length direction of the metal foil of the first insulating film is shifted from the end on the same side of the second insulating film, the insulation of only one side from the metal foil is performed. It becomes possible to bend the film. Therefore, the workability is better than when the metal foil and the insulating film on both sides are folded, and it is possible to suppress the folding from returning due to the elasticity of the insulating film. Moreover, compared with the case where only metal foil is bent, since metal foil is protected by the insulating film, a fracture | rupture can be suppressed. Thereby, both shape retention and reliability can be achieved.

以下、本発明の一実施形態について図１から図５を参照して説明する。
図１の（ａ）はリード部材を示す側面図であり、（ｂ）はリード部材を示す平面図、図２はリード部材付非水電解質蓄電デバイスを示す透過平面図、図３はリード部材付非水電解質蓄電デバイスを示す部分断面図、図４及び図５はリード部材付非水電解質蓄電デバイスを示すリード部材を折り曲げた状態の部分断面図である。 Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
1A is a side view showing a lead member, FIG. 1B is a plan view showing the lead member, FIG. 2 is a transparent plan view showing a nonaqueous electrolyte electricity storage device with a lead member, and FIG. 3 is with a lead member. FIG. 4 and FIG. 5 are partial cross-sectional views showing a state in which the lead member showing the non-aqueous electrolyte power storage device with a lead member is bent.

図１に示すように、リード部材１０は、帯状の金属箔１１と、この金属箔１１の長さ方向の中間部の両面側に配置される二枚の絶縁フィルム１２，１３とからなっている。リード部材１０は、金属箔１１の長さ方向の中間部に、第一の絶縁フィルム１２が金属箔１１の一方の側面から接着され、第二の絶縁フィルム１３が金属箔１１の他方の側面から接着されて、第一の絶縁フィルム１２と第二の絶縁フィルム１３とが貼り合わされてなるものである。   As shown in FIG. 1, the lead member 10 is composed of a strip-shaped metal foil 11 and two insulating films 12 and 13 disposed on both sides of the intermediate portion in the length direction of the metal foil 11. . In the lead member 10, the first insulating film 12 is bonded from one side surface of the metal foil 11 to the middle portion of the metal foil 11 in the length direction, and the second insulating film 13 is bonded from the other side surface of the metal foil 11. The first insulating film 12 and the second insulating film 13 are bonded and bonded together.

金属箔１１は、アルミニウム等の導電性金属材料からなっており、一定幅かつ一定厚さをなしている。例えば、金属箔１１の厚さは０．１ｍｍであり、幅は５ｍｍである。   The metal foil 11 is made of a conductive metal material such as aluminum and has a constant width and a constant thickness. For example, the thickness of the metal foil 11 is 0.1 mm, and the width is 5 mm.

絶縁フィルム１２，１３は、例えば、架橋ポリオレフィン樹脂からなる架橋層と、例えば、熱可塑性ポリオレフィン樹脂からなる熱可塑層の２層構造とされている。そして、これらの絶縁フィルム１２，１３は、熱可塑層側を金属箔１１側として熱融着されることで相互に接着しかつ金属箔１１に接着する。   The insulating films 12 and 13 have a two-layer structure of, for example, a crosslinked layer made of a crosslinked polyolefin resin and a thermoplastic layer made of, for example, a thermoplastic polyolefin resin. The insulating films 12 and 13 are bonded to each other and bonded to the metal foil 11 by being thermally fused with the thermoplastic layer side as the metal foil 11 side.

第一の絶縁フィルム１２は、幅及び厚さが一定であり、第二の絶縁フィルム１３も、幅及び厚さが一定となっている。両絶縁フィルム１２，１３は、幅及び厚さがそれぞれ同等となっている。また、両絶縁フィルム１２，１３の長さは、第一の絶縁フィルム１２の方が、第二の絶縁フィルム１３よりも長くなっている。例えば、第一の絶縁フィルム１２の厚さは０．１ｍｍ、長さは５ｍｍであり、第二の絶縁フィルム１３の厚さは０．１ｍｍ、長さは３〜５ｍｍである。   The width and thickness of the first insulating film 12 are constant, and the width and thickness of the second insulating film 13 are also constant. Both insulating films 12 and 13 have the same width and thickness. Further, the lengths of both insulating films 12 and 13 are longer in the first insulating film 12 than in the second insulating film 13. For example, the first insulating film 12 has a thickness of 0.1 mm and a length of 5 mm, and the second insulating film 13 has a thickness of 0.1 mm and a length of 3 to 5 mm.

そして、これらの絶縁フィルム１２，１３を、それぞれの幅の中心位置を金属箔１１の幅の中心位置に合わせ、長さ方向の同じ側の端部１２ａ，１３ａの位置が互いに長さ方向にずれるように配置した状態で金属箔１１に接着し、第一の絶縁フィルム１２と第二の絶縁フィルム１３とを貼り合わせる。このとき、両絶縁フィルム１２，１３は、長さ方向同じ側の端部１２ａ，１３ａの位置が長さ方向にずれるようにして金属箔１１に接着される。なお、長さ方向逆側についても、長さ方向の同じ側の端部１２ｂ，１３ｂの位置を、長さ方向の一側と対称になるようにずらした状態としても良い。あるいは、長さ方向逆側については、長さ方向の同じ側の端部１２ｂ，１３ｂの位置を互いに一致させた状態としても良い。   And these insulating films 12 and 13 match | combine the center position of each width | variety with the center position of the width | variety of the metal foil 11, and the position of edge part 12a, 13a of the same side of a length direction mutually shifts in the length direction. In this state, the first insulating film 12 and the second insulating film 13 are bonded to each other by being bonded to the metal foil 11. At this time, both insulating films 12 and 13 are bonded to the metal foil 11 such that the positions of the end portions 12a and 13a on the same side in the length direction are shifted in the length direction. Note that the positions of the end portions 12b and 13b on the same side in the length direction may be shifted so as to be symmetric with respect to one side in the length direction also on the opposite side in the length direction. Or about the reverse side of a length direction, it is good also as a state which made the position of edge part 12b, 13b of the same side of a length direction correspond mutually.

第一の絶縁フィルム１２の端部１２ａと第二の絶縁フィルム１３の端部１３ａをずらす量は、理論上は少しでも（０．１ｍｍでも）ずれていれば折り曲げ性は格段に良くなる。ただし、ずれ量が小さすぎると現実的には結局第一の絶縁フィルム１２の端部１２ａで金属箔１１のみが曲がってしまって断線する可能性が大きくなると考えられる。第一の絶縁フィルム１２が金属箔１１とともに折り曲げられることを考慮すると、絶縁フィルムの厚さの２倍以上両絶縁フィルム１２，１３の端部をずらすと第二の絶縁フィルム１３の端部１３ａで金属箔１１が第一の絶縁フィルム１２とともに折り曲げられると考えられる。絶縁フィルムの厚さの５倍以上両絶縁フィルム１２，１３の端部をずらすと第一の絶縁フィルム１２とともに金属箔１１が折り曲げられることがさらに確実であり、断線の可能性がない。
一方、絶縁フィルムのずれが長くなれば、リード部材１０の折り曲げ部を絶縁フィルムが完全に覆ってしまうことになる。リード部材１０は機器の端子に接続されるが、端子の位置はリード部材１０の折り曲げ位置とされることが多い。したがって、絶縁フィルムが完全にリード部材１０を覆ってしまうと、その箇所は電気的接点とはならないので、端子の位置設計の自由度を下げてしまい好ましくない。絶縁フィルムのずれは５ｍｍ以下とするのが好ましい。 If the amount of shifting the end portion 12a of the first insulating film 12 and the end portion 13a of the second insulating film 13 is theoretically slightly shifted (even 0.1 mm), the bendability is remarkably improved. However, if the amount of deviation is too small, it is practically considered that the possibility that only the metal foil 11 is bent at the end 12a of the first insulating film 12 and is broken is increased. Considering that the first insulating film 12 is bent together with the metal foil 11, if the end portions of both the insulating films 12 and 13 are shifted more than twice the thickness of the insulating film, the end portion 13 a of the second insulating film 13 It is considered that the metal foil 11 is bent together with the first insulating film 12. If the end portions of both insulating films 12 and 13 are shifted by 5 times or more the thickness of the insulating film, it is further certain that the metal foil 11 is bent together with the first insulating film 12, and there is no possibility of disconnection.
On the other hand, if the displacement of the insulating film becomes long, the insulating film completely covers the bent portion of the lead member 10. The lead member 10 is connected to a terminal of the device, and the position of the terminal is often the bending position of the lead member 10. Therefore, if the insulating film completely covers the lead member 10, the portion does not become an electrical contact, which lowers the degree of freedom in the terminal position design, which is not preferable. The displacement of the insulating film is preferably 5 mm or less.

上記のように金属箔１１に絶縁フィルム１２，１３を接着して一体化された２本のリード部材１０が、図２に示すように、リード部材付非水電解質蓄電デバイス２０の端子として使用される。リード部材付非水電解質蓄電デバイス２０は、シート状のポリマー電池であり、正極２１、負極２２、隔膜２３及び電解質媒体２４が包材２５で密封されたものである。包材２５は、アルミニウムを樹脂でラミネートしたラミネート材からなる。一方のリード部材１０が正極２１に、他方のリード部材１０が負極２２にそれぞれ接続される。リード部材１０は、絶縁フィルム１２，１３の端部１２ｂ，１３ｂ側が、正極２１あるいは負極２２に接続される。そして、これらのリード部材１０が、包材２５から一端側が導出された状態で包材２５が熱融着で封止される。その際に、包材２５に対して、リード部材１０は絶縁フィルム１２，１３の位置で熱融着により接着される。   The two lead members 10 integrated by bonding the insulating films 12 and 13 to the metal foil 11 as described above are used as terminals of the non-aqueous electrolyte electricity storage device 20 with lead members as shown in FIG. The The non-aqueous electrolyte electricity storage device 20 with a lead member is a sheet-like polymer battery in which a positive electrode 21, a negative electrode 22, a diaphragm 23, and an electrolyte medium 24 are sealed with a packaging material 25. The packaging material 25 is made of a laminate material obtained by laminating aluminum with a resin. One lead member 10 is connected to the positive electrode 21, and the other lead member 10 is connected to the negative electrode 22. In the lead member 10, the end portions 12 b and 13 b of the insulating films 12 and 13 are connected to the positive electrode 21 or the negative electrode 22. Then, the packaging material 25 is sealed by thermal fusion in a state where one end side of the lead member 10 is led out from the packaging material 25. At that time, the lead member 10 is bonded to the packaging material 25 at the positions of the insulating films 12 and 13 by heat fusion.

リード部材１０は、表裏の絶縁フィルム１２，１３の端部１２ａ，１３ａの位置が相違している。このことから、リード部材１０は、包材２５への接着時に、図３に示すように、第一の絶縁フィルム１２の端部１２ａが包材２５から突出し、第二の絶縁フィルム１３の端部１３ａが包材２５から第一の絶縁フィルム１２よりも小さく突出するか、または、包材２５の端部と同位置となるように配置される（図示例は包材２５の端部と同位置となっている）。なお、正極２１に接続されるリード部材１０および負極２２に接続されるリード部材１０は、何れも、包材２５に対して厚さ方向の同じ側に第一の（長い方の）絶縁フィルム１２が配置され、第一の絶縁フィルム１２が包材２５から同じ長さ突出するように配置された状態で、包材２５に接着される。   In the lead member 10, the positions of the end portions 12a and 13a of the insulating films 12 and 13 on the front and back sides are different. From this, when the lead member 10 is bonded to the packaging material 25, the end portion 12 a of the first insulating film 12 protrudes from the packaging material 25 as shown in FIG. 13a protrudes smaller than the first insulating film 12 from the packaging material 25, or is disposed so as to be at the same position as the end of the packaging material 25 (the illustrated example is the same position as the end of the packaging material 25). ) Note that the lead member 10 connected to the positive electrode 21 and the lead member 10 connected to the negative electrode 22 are both on the same side in the thickness direction with respect to the packaging material 25, the first (longer) insulating film 12. And the first insulating film 12 is adhered to the packaging material 25 in a state where the first insulating film 12 is disposed so as to protrude from the packaging material 25 by the same length.

そして、リード部材付非水電解質蓄電デバイス２０は、図４に示すように、リード部材１０が、第二の絶縁フィルム１３の長さ方向の外側の端部１３ａの位置となる折り曲げ位置Ｘで、第二の絶縁フィルム１３の配置側に折り曲げられて使用される。つまり、リード部材１０は、第一の絶縁フィルム１２の長さ方向の中間位置及び金属箔１１の長さ方向の中間位置が一緒に、第二の絶縁フィルム１３の側に折り曲げられて使用される。   And as shown in FIG. 4, the non-aqueous electrolyte electricity storage device 20 with a lead member is a bending position X where the lead member 10 is the position of the outer end portion 13a in the length direction of the second insulating film 13, The second insulating film 13 is used by being folded to the arrangement side. That is, the lead member 10 is used by being bent together with the intermediate position in the length direction of the first insulating film 12 and the intermediate position in the length direction of the metal foil 11 toward the second insulating film 13. .

以上に述べた本実施形態によれば、リード部材１０の両側の絶縁フィルム１２，１３の長さ方向のそれぞれ一方の端部１２ａ，１３ａの位置が、絶縁フィルム１２，１３の厚さの５倍以上長さ方向にずれている。そして、このようなリード部材１０が、第一の絶縁フィルム１２の端部１２ａが包材２５から突出し、第二の絶縁フィルム１３の端部１３ａが包材２５から第一の絶縁フィルム１２よりも小さく突出するかまたは包材２５の端部と同位置となるようにリード部材付非水電解質蓄電デバイス２０に配置されている。このようなリード部材１０を、その第二の絶縁フィルム１３を折り曲げずに、金属箔１１と第一の絶縁フィルム１２とを折り曲げて使用する。折り曲げの内側には絶縁フィルムが存在しないので、金属箔１１と両側の絶縁フィルム１２，１３とを折り曲げる場合と比べて、絶縁フィルムの弾性によってリード部材１０の折れ曲がりが元に戻ってしまうことを抑制できる。また、折り曲げも容易となり、折り曲げ作業の作業性も向上できる。また、金属箔１１のみを折り曲げる場合と比べて、金属箔１１を折り曲げた外側を第一の絶縁フィルム１２によって保護できるため、リード部材１０の破断を抑制できる。したがって、形状保持性と信頼性とを両立できる。   According to the present embodiment described above, the positions of the end portions 12a and 13a in the length direction of the insulating films 12 and 13 on both sides of the lead member 10 are five times the thickness of the insulating films 12 and 13, respectively. It has shifted in the length direction. In such a lead member 10, the end portion 12 a of the first insulating film 12 protrudes from the packaging material 25, and the end portion 13 a of the second insulating film 13 extends from the packaging material 25 more than the first insulating film 12. It is arranged in the nonaqueous electrolyte electricity storage device 20 with a lead member so as to protrude small or to be at the same position as the end of the packaging material 25. Such a lead member 10 is used by bending the metal foil 11 and the first insulating film 12 without bending the second insulating film 13. Since there is no insulating film inside the bend, it is possible to prevent the bending of the lead member 10 from returning to its original state due to the elasticity of the insulating film, as compared with the case where the metal foil 11 and the insulating films 12 and 13 on both sides are folded. it can. Further, the folding can be facilitated, and the workability of the bending work can be improved. Moreover, since the outer side which bent the metal foil 11 can be protected by the 1st insulating film 12, compared with the case where only the metal foil 11 is bent, the fracture | rupture of the lead member 10 can be suppressed. Accordingly, both shape retention and reliability can be achieved.

また、リード部材１０が、第二の絶縁フィルム１３の端部１３ａの位置で、第二の絶縁フィルム１３の側に折り曲げられている。このため、金属箔１１の折り曲げ側による折り曲げ部の外側を第一の絶縁フィルム１２で保護しつつ、折り曲げ部の内側を第二の絶縁フィルム１３の端部１３ａで保護できる。   Further, the lead member 10 is bent toward the second insulating film 13 at the position of the end portion 13 a of the second insulating film 13. For this reason, the inner side of the bent part can be protected by the end portion 13 a of the second insulating film 13 while the outer side of the bent part on the bent side of the metal foil 11 is protected by the first insulating film 12.

図５に示すように、リード部材１０が、第二の絶縁フィルム１３の端部１３ａの位置で、第一の絶縁フィルム１２の側に折り曲げられていてもよい。折り曲げる部分に第一の絶縁フィルム１２しかなく第二の絶縁フィルム１３がないことに変わらないので折り曲げやすさ及び復元率は同様である。この場合、第一の絶縁フィルム１２が包材２５に接触するので、包材２５にバリがある場合も包材２５中の金属（アルミニウム）層にリード部材１０の金属箔１１が接触して短絡することがない。   As shown in FIG. 5, the lead member 10 may be bent toward the first insulating film 12 at the position of the end portion 13 a of the second insulating film 13. Since it does not change that there is only the 1st insulating film 12 in the part to be bent, and there is no 2nd insulating film 13, folding ease and a recovery rate are the same. In this case, since the first insulating film 12 is in contact with the packaging material 25, the metal foil 11 of the lead member 10 is in contact with the metal (aluminum) layer in the packaging material 25 even when the packaging material 25 has burrs and short-circuited. There is nothing to do.

なお、両絶縁フィルム１２，１３の全体が長さ方向に対称形状をなすようにすれば、金属箔１１を含めたリード部材１０の全体を長さ方向に対称形状とすることができる。すると、リード部材１０の包材２５への装着の向きの間違いをなくすことができる。なお、絶縁フィルム１２，１３は、長さ方向の一側の端部１２ａ，１３ａのみが上記のようにずれていても良く、この場合、ずれている側を外側にして包材２５に接着されることになる。   If the entire insulating films 12 and 13 are symmetrical in the length direction, the entire lead member 10 including the metal foil 11 can be symmetrical in the length direction. Then, it is possible to eliminate an error in the mounting direction of the lead member 10 to the packaging material 25. The insulating films 12 and 13 may be displaced as described above only at one end 12a and 13a on one side in the length direction. In this case, the insulating films 12 and 13 are bonded to the packaging material 25 with the displaced side being outside. Will be.

次に、本発明のリード部材、リード部材付非水電解質蓄電デバイス及びリード部材の製造方法に係る実施例について説明する。
図６は復元率試験を示す図、図７は屈曲耐久性試験を示す図、図８の（ａ）から（ｆ）はそれぞれリード部材付非水電解質蓄電デバイスの部分断面図である。なお、実施例４は、参考例１と読み替えるものとする。 Next, the lead member of this invention, the nonaqueous electrolyte electrical storage device with a lead member, and the Example which concerns on the manufacturing method of a lead member are demonstrated.
6 is a diagram showing a restoration rate test, FIG. 7 is a diagram showing a bending durability test, and FIGS. 8A to 8F are partial cross-sectional views of a nonaqueous electrolyte electricity storage device with a lead member. In addition, Example 4 shall be read as Reference Example 1.

アルミニウム箔からなる厚さ０．１ｍｍの金属箔１１を５ｍｍ幅に切断し、厚さ０．１ｍｍの絶縁フィルム１２と、厚さ０．１ｍｍの絶縁フィルム１３とを熱融着してリード部材１０を作成した。   A 0.1 mm thick metal foil 11 made of aluminum foil is cut to a width of 5 mm, and a 0.1 mm thick insulating film 12 and a 0.1 mm thick insulating film 13 are heat-sealed to lead member 10. It was created.

そして、復元率試験及び屈曲耐久性試験を行った。
復元率試験は、図６に示すように、リード部材１０を所定の折り曲げ位置Ｘで９０°折り曲げ、１分経過後に、戻った角度θを測定した。そして、復元率をθ／９０×１００（％）で算出し、復元率が１０％以下を合格とし、復元率が１０％を超えると不合格とした。なお、この復元率試験は、図９に示すように、リード部材１０を第一の絶縁フィルム１２の側に折り曲げて行ってもよい。 And the restoration rate test and the bending durability test were done.
In the restoration rate test, as shown in FIG. 6, the lead member 10 was bent 90 ° at a predetermined bending position X, and the returned angle θ was measured after 1 minute. Then, the restoration rate was calculated by θ / 90 × 100 (%), the restoration rate of 10% or less was accepted, and the restoration rate exceeded 10% was rejected. This restoration rate test may be performed by bending the lead member 10 toward the first insulating film 12 as shown in FIG.

また、屈曲耐久性試験は、リード部材１０を、所定の折り曲げ位置Ｘで、図７に矢印（１）で示すように一方向に９０°折り曲げた後、図７に矢印（２）で示すように元に戻す。次に、図７に矢印（３）で示すように逆方向に９０°折り曲げた後、図７に矢印（４）で示すように元に戻す。以上のような往復の曲げ戻しを一回とし、これを６回繰り返して金属箔１１の破断の有無を確認した。金属箔１１に破断が生じなければ合格とし、金属箔１１に破断が生じた場合を不合格とした。   In the bending durability test, the lead member 10 is bent at a predetermined bending position X by 90 ° in one direction as indicated by an arrow (1) in FIG. 7, and then as indicated by an arrow (2) in FIG. Return to the original. Next, after being bent by 90 ° in the reverse direction as shown by the arrow (3) in FIG. 7, it is restored as shown by the arrow (4) in FIG. The reciprocal bending back as described above was performed once, and this was repeated 6 times to confirm whether or not the metal foil 11 was broken. If the metal foil 11 did not break, it was accepted, and the case where the metal foil 11 broke was rejected.

実施例１では、図８（ａ）に示すように、長さ５．０ｍｍの絶縁フィルム１２及び長さ４．５ｍｍの絶縁フィルム１３を用いた。第一の絶縁フィルム１２を包材２５の際から２．０ｍｍ突出させ、第二の絶縁フィルム１３を包材２５の際から１．５ｍｍ突出させた。そして、包材２５からの突出量が小さい第二の絶縁フィルム１３の端部１３ａの位置を折り曲げ位置Ｘとして、復元率試験及び屈曲耐久性試験を行った。   In Example 1, as shown to Fig.8 (a), the insulating film 12 of length 5.0mm and the insulating film 13 of length 4.5mm were used. The first insulating film 12 was protruded 2.0 mm from the case of the packaging material 25, and the second insulating film 13 was protruded 1.5 mm from the case of the packaging material 25. Then, the restoration rate test and the bending durability test were performed with the position of the end portion 13a of the second insulating film 13 having a small protrusion amount from the packaging material 25 as the bending position X.

また、実施例２では、図８（ｂ）に示すように、長さ５．０ｍｍの絶縁フィルム１２及び長さ４．０ｍｍの絶縁フィルム１３を用いた。第一の絶縁フィルム１２を包材２５の際から２．０ｍｍ突出させ、第二の絶縁フィルム１２を包材２５の際から１．０ｍｍ突出させた。そして、包材２５からの突出量が小さい第二の絶縁フィルム１３の端部１３ａの位置を折り曲げ位置Ｘとして、復元率試験及び屈曲耐久性試験を行った。   Moreover, in Example 2, as shown in FIG.8 (b), the insulating film 12 of length 5.0mm and the insulating film 13 of length 4.0mm were used. The first insulating film 12 was protruded by 2.0 mm from the case of the packaging material 25, and the second insulating film 12 was protruded by 1.0 mm from the case of the packaging material 25. Then, the restoration rate test and the bending durability test were performed with the position of the end portion 13a of the second insulating film 13 having a small protrusion amount from the packaging material 25 as the bending position X.

また、実施例３では、図８（ｃ）に示すように、長さ５．０ｍｍの絶縁フィルム１２及び長さ３．５ｍｍの絶縁フィルム１３を用いた。第一の絶縁フィルム１２を包材２５の際から２．０ｍｍ突出させ、第二の絶縁フィルム１２を包材２５の際から０．５ｍｍ突出させた。そして、包材２５からの突出量が小さい第二の絶縁フィルム１３の端部１３ａの位置を折り曲げ位置Ｘとして、復元率試験及び屈曲耐久性試験を行った。   Moreover, in Example 3, as shown in FIG.8 (c), the insulating film 12 of length 5.0mm and the insulating film 13 of length 3.5mm were used. The first insulating film 12 was protruded 2.0 mm from the case of the packaging material 25, and the second insulating film 12 was protruded 0.5 mm from the case of the packaging material 25. Then, the restoration rate test and the bending durability test were performed with the position of the end portion 13a of the second insulating film 13 having a small protrusion amount from the packaging material 25 as the bending position X.

また、実施例４では、図８（ｄ）に示すように、長さ５．０ｍｍの絶縁フィルム１２及び長さ３．０ｍｍの絶縁フィルム１３を用いた。第一の絶縁フィルム１２を包材２５の際から２．０ｍｍ突出させ、第二の絶縁フィルム１３を包材２５の際と一致させた。そして、包材２５からの突出量が小さい第二の絶縁フィルム１３の端部１３ａの位置を折り曲げ位置Ｘとして、復元率試験及び屈曲耐久性試験を行った。   Moreover, in Example 4, as shown in FIG.8 (d), the insulating film 12 of length 5.0mm and the insulating film 13 of length 3.0mm were used. The first insulating film 12 was protruded 2.0 mm from the case of the packaging material 25, and the second insulating film 13 was matched with the case of the packaging material 25. Then, the restoration rate test and the bending durability test were performed with the position of the end portion 13a of the second insulating film 13 having a small protrusion amount from the packaging material 25 as the bending position X.

また、比較例１は、図８（ｅ）に示すように、長さ５．０ｍｍの絶縁フィルム１２及び長さ５．０ｍｍの絶縁フィルム１３を用いた。第一の絶縁フィルム１２を包材２５の際から２．０ｍｍ突出させ、第二の絶縁フィルム１３も包材２５の際から２．０ｍｍ突出させた。そして、比較例１では、絶縁フィルム１２，１３の端部１２ａ，１３ａの位置を折り曲げ位置Ｘとして、復元率試験及び屈曲耐久性試験を行った。なお、この比較例１が従来構造である。   Moreover, as shown in FIG.8 (e), the comparative example 1 used the insulating film 12 of length 5.0mm, and the insulating film 13 of length 5.0mm. The first insulating film 12 was protruded 2.0 mm from the case of the packaging material 25, and the second insulating film 13 was also protruded 2.0 mm from the case of the packaging material 25. And in the comparative example 1, the position of the edge parts 12a and 13a of the insulating films 12 and 13 was made into the bending position X, and the restoration rate test and the bending durability test were done. In addition, this comparative example 1 is a conventional structure.

また、比較例２は、図８（ｆ）に示すように、長さ５．０ｍｍの絶縁フィルム１２及び長さ５．０ｍｍの絶縁フィルム１３を用いた。第一の絶縁フィルム１２を包材２５の際から２．０ｍｍ突出させ、第二の絶縁フィルム１３も包材２５の際から２．０ｍｍ突出させた。そして、比較例２では、包材２５の端部の位置を折り曲げ位置Ｘとして、復元率試験及び屈曲耐久性試験を行った。   In Comparative Example 2, as shown in FIG. 8F, an insulating film 12 having a length of 5.0 mm and an insulating film 13 having a length of 5.0 mm were used. The first insulating film 12 was protruded 2.0 mm from the case of the packaging material 25, and the second insulating film 13 was also protruded 2.0 mm from the case of the packaging material 25. And in the comparative example 2, the position of the edge part of the packaging material 25 was made into the bending position X, and the restoration rate test and the bending durability test were done.

以上の復元率試験及び屈曲耐久性試験の結果は、次表の通りである。   The results of the above restoration rate test and bending durability test are as shown in the following table.

Figure 0005470754
Figure 0005470754

上記結果から明らかなように、実施例１〜４では、復元率試験がすべて合格（○）となり、屈曲耐久性試験もすべて合格（○）となった。
これに対して、比較例１では、復元率試験は合格であったものの、屈曲耐久性試験が不合格となった。
また、比較例２では、９０°屈曲させること自体が困難であり、復元率試験はθが大きく戻って不合格（×）となった。そして、屈曲耐久性試験は、９０°屈曲させることが困難なため測定不能であった。 As apparent from the above results, in Examples 1 to 4, all the restoration rate tests passed (◯), and all the bending durability tests passed (◯).
On the other hand, in Comparative Example 1, although the restoration rate test passed, the bending durability test failed.
Further, in Comparative Example 2, it was difficult to bend by 90 °, and the restoration rate test was unacceptable (x) because θ greatly returned. The bending durability test was not possible because it was difficult to bend 90 °.

以上の実施例１〜４から、第一の絶縁フィルム１２と第二の絶縁フィルム１３の長さ方向の端部１２ａ，１３ａの位置が、絶縁フィルム１２，１３の厚さ（０．１ｍｍ）の５倍（０．５ｍｍ）以上、長さ方向にずれていれば良いことが確認された。
上記の実施例では、絶縁フィルム１２，１３と包材２５とを密着（溶着）する部分の長さはいずれも３ｍｍであるが、包材２５中の電解質が外に漏れないためには、絶縁フィルム１２，１３と包材２５との密着（溶着）部分の長さを１ｍｍ以上とすればよい。第一の絶縁フィルム１２と第二の絶縁フィルム１３とが貼り合わされている部分の長さは絶縁フィルム１２，１３と包材２５との密着部分の長さ以上とする。 From the above Examples 1 to 4, the positions of the end portions 12a and 13a in the length direction of the first insulating film 12 and the second insulating film 13 are the thickness (0.1 mm) of the insulating films 12 and 13. It was confirmed that it should have shifted | deviated to the length direction 5 times (0.5 mm) or more.
In the above embodiment, the lengths of the portions where the insulating films 12 and 13 and the packaging material 25 are in close contact (welding) are 3 mm. However, in order to prevent the electrolyte in the packaging material 25 from leaking outside, insulation is required. What is necessary is just to let the length of the adhesion | attachment (welding) part of the films 12 and 13 and the packaging material 25 be 1 mm or more. The length of the portion where the first insulating film 12 and the second insulating film 13 are bonded together is equal to or greater than the length of the contact portion between the insulating films 12 and 13 and the packaging material 25.

本発明に係るリード部材の実施形態の例を示すもので（ａ）は側面図、（ｂ）は平面図である。The example of embodiment of the lead member which concerns on this invention is shown, (a) is a side view, (b) is a top view. 本発明に係るリード部材付非水電解質蓄電デバイスの実施形態の例を示す透過平面図である。It is a permeation | transmission top view which shows the example of embodiment of the nonaqueous electrolyte electrical storage device with a lead member which concerns on this invention. 図２のリード部材付非水電解質蓄電デバイスを示す部分断面図である。It is a fragmentary sectional view which shows the nonaqueous electrolyte electrical storage device with a lead member of FIG. 図２のリード部材付非水電解質蓄電デバイスをにおけるリード部材を折り曲げた状態の部分断面図である。It is a fragmentary sectional view of the state where the lead member in the nonaqueous electrolyte electricity storage device with a lead member of FIG. 2 was bent. 図２のリード部材付非水電解質蓄電デバイスをにおけるリード部材を折り曲げた状態の部分断面図である。It is a fragmentary sectional view of the state where the lead member in the nonaqueous electrolyte electricity storage device with a lead member of FIG. 2 was bent. 復元率試験を示す図である。It is a figure which shows a restoration rate test. 屈曲耐久性試験を示す図である。It is a figure which shows a bending durability test. 実施例および比較例におけるリード部材付非水電解質蓄電デバイスの部分断面図である。It is a fragmentary sectional view of the nonaqueous electrolyte electrical storage device with a lead member in an example and a comparative example. 復元率試験を示す別の図である。It is another figure which shows a restoration rate test.

符号の説明Explanation of symbols

１０：リード部材、１１：金属箔、１２：第一の絶縁フィルム、１３：第二の絶縁フィルム、１２ａ，１３ａ：一方の端部、２０：リード部材付非水電解質蓄電デバイス、２１：正極、２２：負極、２３：隔膜、２４：電解質媒体、２５：包材   10: lead member, 11: metal foil, 12: first insulating film, 13: second insulating film, 12a, 13a: one end, 20: nonaqueous electrolyte electricity storage device with lead member, 21: positive electrode, 22: negative electrode, 23: diaphragm, 24: electrolyte medium, 25: packaging material

Claims (2)

帯状の金属箔の長さ方向の中間部に、第一の絶縁フィルムが前記金属箔の一方の側面から接着され、第二の絶縁フィルムが前記金属箔の他方の側面から接着されて、前記第一の絶縁フィルムと前記第二の絶縁フィルムとが貼り合わされてなるリード部材を有するとともに、前記リード部材が接続された正極及び負極が電解質媒体とともに包材で密封され、前記リード部材が前記第一の絶縁フィルムと前記第二の絶縁フィルムで前記包材に密着されてなるリード部材付非水電解質蓄電デバイスであって、
前記包材は、金属層を樹脂でラミネートしたラミネート材であり、
前記リード部材は、前記第一の絶縁フィルムの前記金属箔の長さ方向の一方の端部が、前記第二の絶縁フィルムの同側の端部からずらされており、さらに、
前記リード部材は、前記第一の絶縁フィルムの端部が前記包材から突出し、前記第二の絶縁フィルムの端部が前記包材から前記第一の絶縁フィルムよりも小さく突出していることを特徴とするリード部材付非水電解質蓄電デバイス。 A first insulating film is bonded from one side surface of the metal foil, and a second insulating film is bonded from the other side surface of the metal foil to an intermediate portion in the length direction of the strip-shaped metal foil, and the first A lead member formed by laminating one insulating film and the second insulating film; a positive electrode and a negative electrode connected to the lead member are sealed together with an electrolyte medium with a packaging material; and the lead member is the first member A non-aqueous electrolyte electricity storage device with a lead member formed in close contact with the packaging material with the insulating film and the second insulating film,
The packaging material is a laminate material in which a metal layer is laminated with a resin,
In the lead member, one end in the length direction of the metal foil of the first insulating film is shifted from the same end of the second insulating film, and
In the lead member, an end portion of the first insulating film protrudes from the packaging material, and an end portion of the second insulating film protrudes smaller than the first insulating film from the packaging material. A non-aqueous electrolyte electricity storage device with a lead member. 前記リード部材が、前記第二の絶縁フィルムの前記端部の位置で折り曲げられていることを特徴とする請求項１に記載のリード部材付非水電解質蓄電デバイス。   The non-aqueous electrolyte electricity storage device with a lead member according to claim 1, wherein the lead member is bent at a position of the end portion of the second insulating film.
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