JP2015153694A - electrochemical cell - Google Patents

electrochemical cell Download PDF

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JP2015153694A
JP2015153694A JP2014028600A JP2014028600A JP2015153694A JP 2015153694 A JP2015153694 A JP 2015153694A JP 2014028600 A JP2014028600 A JP 2014028600A JP 2014028600 A JP2014028600 A JP 2014028600A JP 2015153694 A JP2015153694 A JP 2015153694A
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folded
electrochemical cell
electrode
peripheral
electrode body
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JP6266375B2 (en
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渡邊　俊二
Shunji Watanabe
俊二 渡邊
和美 田中
Kazumi Tanaka
和美 田中
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Seiko Instruments Inc
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Seiko Instruments Inc
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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

Abstract

PROBLEM TO BE SOLVED: To provide an electrochemical cell easy to have a thin structure.SOLUTION: A nonaqueous electrolyte secondary battery 110 includes an electrode body 11 having a positive electrode and a negative electrode and a pair of electrode terminals 13, and a casing body 21 formed by superimposing sheets for housing the electrode body 11. The casing body 21 has a housing part 23 in which the electrode body 11 is housed between the sheets, and a peripheral fringe part 29 formed by closely adhering three sides of the sheet in the periphery of the housing part 23. At least a part of the peripheral fringe part 29 is folded back to the housing part on the peripheral fringe part to form folded parts 30a, 30b, and the folded part 30 is thinner than the thickness of the housing part 23. The housing part 23 has a projecting part in the outside direction viewing from the electrode body 11, and the folded parts 30a,30b are folded back toward the projecting part side.

Description

本発明は、電気化学セルに関するものである。   The present invention relates to an electrochemical cell.

現在、電気化学セルは、各種デバイスの電源などに利用されている。電気化学セルの１つの形態として、例えば下記特許文献１および特許文献２のようなラミネートフィルム外装体からなる電池が提案されている。   Currently, electrochemical cells are used as power sources for various devices. As one form of the electrochemical cell, for example, a battery made of a laminate film outer package as in Patent Document 1 and Patent Document 2 below has been proposed.

特許文献１においては、外装体の周縁部を折り返し、接着テープ貼り付けることにより、電池本体の外形寸法を小さくしている。また、特許文献２においては、接着性を有する絶縁テープを用いてラミネートフィルム端面を保護することで、ラミネートフィルム端面に露出した金属箔が電池負極と短絡して腐食を起こす現象を防止している。   In Patent Document 1, the outer dimension of the battery body is reduced by folding back the peripheral portion of the exterior body and attaching the adhesive tape. Moreover, in patent document 2, the laminated film end surface is protected using the adhesive tape which has adhesiveness, and the metal foil exposed to the laminate film end surface prevents the phenomenon which short-circuits with a battery negative electrode and causes corrosion. .

さらに、図７を用いて従来例の概要を説明する。図７は、従来例の薄型の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は、第１直線２５での断面図である。
従来例では、図７に示す電極体１１の一対の側辺に近接する外装体２１の周縁部２９がある。周縁部２９のラミネートフィルム端面に露出した金属箔を被覆するために、２枚の絶縁テープ４１が貼り付けられている。絶縁テープ４１は、断面図（ｂ）に示すようにコの字形に貼られていることが多い。 Furthermore, the outline of the conventional example will be described with reference to FIG. 7A and 7B are schematic views of a conventional thin electrochemical cell, in which FIG. 7A is a plan view and FIG. 7B is a cross-sectional view taken along a first straight line 25.
In the conventional example, there is a peripheral edge portion 29 of the exterior body 21 close to a pair of side edges of the electrode body 11 shown in FIG. Two insulating tapes 41 are attached to cover the exposed metal foil on the end face of the laminated film at the peripheral edge 29. The insulating tape 41 is often attached in a U shape as shown in the cross-sectional view (b).

特開２００１−２５０５１６号公報JP 2001-250516 A 特開２００５−１９７２１８号公報JP-A-2005-197218

上述のような電気化学セルは、近年、電気化学セルを搭載する機器の薄型化により、より薄型の電気化学セルの要望が高まっているが、図７に示す周縁部の構造となっているため、面積的に小さく出来ない。   In recent years, the demand for a thinner electrochemical cell has been increased due to the thinning of the equipment on which the electrochemical cell is mounted. However, the electrochemical cell has a peripheral structure shown in FIG. Can not be small in area.

周縁部自体の面積を小さくすると、封止性が低下し、電気化学セル内への水分進入などにより性能が劣化することがある。そのため、周縁部の幅として３ｍｍ程度確保する必要がある。また、周縁部を図７の厚み方向に折り曲げる方法があるが、電極体を収納した収納部における厚さが３ｍｍ以下の電気化学セルの場合、セルの厚さ以上に折り返した周縁部が飛び出すことになり、外形寸法を薄型とすることが出来ないという課題があった。
そこで本発明は、薄型構造が容易な電気化学セルを提供するものである。 If the area of the peripheral edge itself is reduced, the sealing performance is lowered, and the performance may be deteriorated due to moisture intrusion into the electrochemical cell. Therefore, it is necessary to secure about 3 mm as the width of the peripheral portion. In addition, there is a method of bending the peripheral portion in the thickness direction of FIG. 7, but in the case of an electrochemical cell having a thickness of 3 mm or less in the storage portion storing the electrode body, the peripheral portion folded back more than the thickness of the cell pops out. Therefore, there is a problem that the outer dimensions cannot be reduced.
Therefore, the present invention provides an electrochemical cell having a thin structure.

上記の課題を解決するために、本発明の電気化学セルは、正極および負極を有し、１対の電極端子を有する電極体と、シートを重ね合わせて形成され、前記電極体を収納する外装体と、を備え、前記外装体は、前記シートの間に前記電極体を収納した収納部と、前記収納部の周囲において前記シートの３辺を密着させた周縁部と、を有し、前記周縁部の少なくとも一部は、前記周縁部上で前記収納部方向に折り返されて折り返し部を形成し、 前記折り返し部は、前記収納部の厚みより薄くなっており、前記収納部は、前記電極体から見て外側の方向に凸部を有し、前記折り返し部は前記凸部側に折り返されることを特徴とする。
この構成によれば、周縁部は、収納部方向に折り返されるため、電気化学セルの面積および外形寸法は小さくなる。また、折り返し部を特に凸部側に折り返し収納部より薄くすれば、折り返し部の厚みにより電気化学セルの厚みが増すことが無いため、結果として、薄型の電気化学セルを提供できる。 In order to solve the above-described problems, an electrochemical cell of the present invention has a positive electrode and a negative electrode, an electrode body having a pair of electrode terminals, and an outer package that is formed by overlapping sheets and accommodates the electrode body A body, and the exterior body has a housing part that houses the electrode body between the sheets, and a peripheral part that closely contacts the three sides of the sheet around the housing part, At least a part of the peripheral portion is folded back toward the storage portion on the peripheral portion to form a folded portion, and the folded portion is thinner than the thickness of the storage portion, and the storage portion is the electrode. A convex portion is provided in an outer direction when viewed from the body, and the folded portion is folded to the convex portion side.
According to this configuration, since the peripheral edge portion is folded back in the storage portion direction, the area and outer dimensions of the electrochemical cell are reduced. Further, if the folded portion is made thinner than the folded storage portion, particularly on the convex portion side, the thickness of the electrochemical cell does not increase due to the thickness of the folded portion, and as a result, a thin electrochemical cell can be provided.

さらに本発明の電気化学セルは、前記周縁部のうち、前記電極端子を出していない２辺の前記周縁部が交差する箇所に切り欠き部を設けることを特徴とする。
この構成によれば、当該箇所のみ、シートが過剰に重なることがなく、薄型構造を確保できるため、結果として、薄型の電気化学セルを提供できる。 Furthermore, the electrochemical cell of the present invention is characterized in that a cutout portion is provided at a location where the peripheral portions of the two sides that do not protrude the electrode terminal intersect.
According to this configuration, since the sheet does not overlap excessively only at the portion and a thin structure can be secured, as a result, a thin electrochemical cell can be provided.

さらに本発明の電気化学セルは、前記折り返し部が、再熱融着されていることを特徴とする。
この構成によれば、熱融着により硬化した樹脂層において、折り曲げにより生じた白化部が再熱融着により再融解するため、白化部の微小なクラックが解消される。そのため、樹脂層の微小なクラックをパスとする外部からの水分の侵入や、電解液の漏れなどを抑制できる。また、樹脂層の微小なクラックをパスとして金属箔が電解液と接触することにより生じる合金化反応を抑制できる。したがって、耐久性の高い電気化学セルを得ることができる。また、再熱融着時の加圧により、再融解した樹脂部がつぶれ、折り返し部の厚さを薄く出来るため、結果として、薄型の電気化学セルを提供できる。 Furthermore, the electrochemical cell of the present invention is characterized in that the folded portion is reheat-sealed.
According to this configuration, in the resin layer cured by heat fusion, the whitened portion generated by bending is remelted by reheat fusion, so that minute cracks in the whitened portion are eliminated. For this reason, it is possible to suppress entry of moisture from the outside through a minute crack in the resin layer or leakage of the electrolyte. Moreover, the alloying reaction which arises when a metal foil contacts electrolyte solution by making the micro crack of a resin layer into a path | pass can be suppressed. Therefore, a highly durable electrochemical cell can be obtained. In addition, the remelted resin portion is crushed by pressurization during reheat fusion, and the thickness of the folded portion can be reduced. As a result, a thin electrochemical cell can be provided.

さらに本発明の電気化学セルは、前記周縁部はシートの金属箔が露出した最端部を有し、前記最端部は絶縁テープで被覆されていることを特徴とする。
この構成によれば、最端部が被覆され、他の導電部との短絡をよりなくすことができる。また、折り返し部の開きを抑える役割も果たすため、電気化学セルを薄型に保つことも可能であるため、結果として、薄型の電気化学セルを提供できる。 Furthermore, the electrochemical cell of the present invention is characterized in that the peripheral portion has an endmost portion where the metal foil of the sheet is exposed, and the endmost portion is covered with an insulating tape.
According to this configuration, the outermost portion is covered, and a short circuit with other conductive portions can be further eliminated. In addition, since it plays a role of suppressing the opening of the folded portion, it is possible to keep the electrochemical cell thin, and as a result, a thin electrochemical cell can be provided.

さらに本発明の電気化学セルは、前記収納部の厚さが３ｍｍ以下であることを特徴とする。
この構成によれば、封止性を確保しつつ、薄型の電気化学セルを提供することできる。 Furthermore, the electrochemical cell of the present invention is characterized in that the storage portion has a thickness of 3 mm or less.
According to this structure, a thin electrochemical cell can be provided while ensuring sealing performance.

本発明の電気化学セルによれば、周縁部は、電極体側に折り返されるため、電気化学セルの面積は小さくなる。また、周縁部の端部を電極体にかからない位置とすれば、収納部の高さより高くなることがなく、結果として、薄型の電気化学セルを提供できる。また、周縁部の端部となるラミネートフィルム端面に金属箔が露出しない状態とすることもできるため、信頼性の高い電気化学セルを得ることができる。   According to the electrochemical cell of the present invention, since the peripheral portion is folded back to the electrode body side, the area of the electrochemical cell is reduced. Moreover, if the edge part of a peripheral part is made into the position which does not cover an electrode body, it will not become higher than the height of a storage part, As a result, a thin electrochemical cell can be provided. Moreover, since it can also be set as the state which does not expose metal foil to the laminated film end surface used as the edge part of a peripheral part, a highly reliable electrochemical cell can be obtained.

第１実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は断面図である。It is the schematic of the electrochemical cell of 1st Embodiment, (a) is a top view, (b) is sectional drawing. 第１実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は断面図である。It is the schematic of the electrochemical cell of 1st Embodiment, (a) is a top view, (b) is sectional drawing. 第２実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は断面図、（ｃ）は、周縁部を折り返す前の平面図である。It is the schematic of the electrochemical cell of 2nd Embodiment, (a) is a top view, (b) is sectional drawing, (c) is a top view before folding back a peripheral part. 第２実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は断面図である。It is the schematic of the electrochemical cell of 2nd Embodiment, (a) is a top view, (b) is sectional drawing. 第２実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は断面図である。It is the schematic of the electrochemical cell of 2nd Embodiment, (a) is a top view, (b) is sectional drawing. 第３実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は断面図、（ｃ）は、周縁部を折り返す前の平面図である。It is the schematic of the electrochemical cell of 3rd Embodiment, (a) is a top view, (b) is sectional drawing, (c) is a top view before turning up a peripheral part. 従来例の電気化学セルの概略図である。It is the schematic of the electrochemical cell of a prior art example.

以下、本発明の実施形態を図面に基づいて説明する。なお、以下の説明で用いる図面では、わかりやすくするために便宜上、絶縁テープ、再熱融着部にハッチングを付している。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings used in the following description, for the sake of simplicity, the insulating tape and the reheat fusion part are hatched for convenience.

（第１実施形態）
最初に、第１実施形態の電気化学セルについて説明する。
図１は、第１実施形態の電気化学セルの概略図である。図１において、（ａ）は平面図、（ｂ）は、第一直線２５で切った場合を仮定した断面図である。本実施形態は、電気化学セルとして、非水電解質二次電池１１０を例に挙げて説明する。 (First embodiment)
Initially, the electrochemical cell of 1st Embodiment is demonstrated.
FIG. 1 is a schematic view of an electrochemical cell according to the first embodiment. 1A is a plan view, and FIG. 1B is a cross-sectional view assuming that the first straight line 25 is cut. In the present embodiment, a nonaqueous electrolyte secondary battery 110 will be described as an example of an electrochemical cell.

図１に示すように、非水電解質二次電池１１０は、正極および負極を有する電極体１１と、ラミネートフィルムなどからなる外装体のシートを重ね合わせて形成され、電極体１１を収納する外装体２１と、を備える。外装体２１は、シートの間に電極体１１を収納した収納部２３と、収納部２３の周囲においてシートを熱融着させた周縁部２９と、を有する。   As shown in FIG. 1, a nonaqueous electrolyte secondary battery 110 is formed by stacking an electrode body 11 having a positive electrode and a negative electrode and a sheet of an exterior body made of a laminate film and the like, and housing the electrode body 11. 21. The exterior body 21 includes a storage portion 23 in which the electrode body 11 is stored between sheets, and a peripheral portion 29 in which the sheet is heat-sealed around the storage portion 23.

収納部２３は、前記シートのうち一方のシートを重ね合わせ方向から見て矩形状に、電極体から見て外側の方向に形成される。また、収納部２３には電極体１１を収納する凸部が一方に形成されていてもよい。また、シートが重ね合わされた周縁部２９は、電極体１１側に折り返され、折り返し部３０ａ、折り返し部３０ｂを構成する。この折り返し部３０ａ及び折り返し部３０ｂは、さらに凸部側に折り返されることが好ましい。   The storage portion 23 is formed in a rectangular shape when one of the sheets is viewed from the overlapping direction and in an outer direction when viewed from the electrode body. Further, the storage portion 23 may be formed with a convex portion for storing the electrode body 11 on one side. Further, the peripheral portion 29 on which the sheets are overlapped is folded back to the electrode body 11 side to constitute a folded portion 30a and a folded portion 30b. It is preferable that the folded portion 30a and the folded portion 30b are further folded toward the convex portion side.

電極体１１は、セパレータを介して互いに積層された正極および負極を含み、正極および負極は、電解液などの非水電解質に接している。また、電極体１１は、収納部２３から外装体２１の外部に引き出された１対の電極端子１３を有する。電極端子１３は、電極体１１の先端辺において一定の間隔で配置され、外装体２１の内部にて電極体１１の正極および負極とそれぞれ電気的に接続されており、周縁部２９と交差して外装体２１の外部へ導出されている。   The electrode body 11 includes a positive electrode and a negative electrode laminated on each other via a separator, and the positive electrode and the negative electrode are in contact with a nonaqueous electrolyte such as an electrolytic solution. In addition, the electrode body 11 has a pair of electrode terminals 13 that are drawn out of the exterior body 21 from the storage portion 23. The electrode terminals 13 are arranged at regular intervals on the tip side of the electrode body 11, and are electrically connected to the positive electrode and the negative electrode of the electrode body 11 inside the exterior body 21, respectively, and intersect with the peripheral edge 29. It is led out of the exterior body 21.

電極体１１の正極は、例えば、アルミニウムなどの金属箔の集電体に正極活物質を付着させたものである。正極活物質は、例えば、コバルト酸リチウム、チタン酸リチウムやマンガン酸リチウムなどのように、リチウムと遷移金属とを含む複酸化物である。負極は、銅などの金属箔の集電体に負極活物質を付着させたものである。負極活物質は、例えば、シリコン酸化物、グラファイト、ハードカーボン、チタン酸リチウム、ＬｉＡｌ等である。   The positive electrode of the electrode body 11 is obtained by attaching a positive electrode active material to a current collector made of metal foil such as aluminum. The positive electrode active material is a complex oxide containing lithium and a transition metal, such as lithium cobaltate, lithium titanate, and lithium manganate. The negative electrode is obtained by attaching a negative electrode active material to a current collector of a metal foil such as copper. Examples of the negative electrode active material include silicon oxide, graphite, hard carbon, lithium titanate, and LiAl.

セパレータは、リチウムイオンを通す特性を有する。セパレータは、例えば、樹脂ポーラスフィルム、ガラス製不織布、樹脂製不織布の１つ、または２以上の組み合わせを含む。この電極体１１は、正極と負極の一方から他方へリチウムイオンが移動することにより、電荷を蓄積（充電）したり電荷を放出（放電）したりすることができる。   The separator has a property of passing lithium ions. The separator includes, for example, one of a resin porous film, a glass nonwoven fabric, a resin nonwoven fabric, or a combination of two or more. The electrode body 11 can accumulate (charge) charges or release (discharge) charges by moving lithium ions from one of the positive electrode and the negative electrode to the other.

外装体２１は、電極体１１の厚み方向から見た外形が概ね矩形状である。外装体２１は、矩形状のシートを重ね合わせて形成されている。本実施形態では、外装体２１は１枚の矩形状のシートの第１シート部と第２シート部との間を二つ折りにして、その折り目を除く３辺に沿って第１シート部と第２シート部とを熱融着することで形成されている。   The outer shape of the exterior body 21 when viewed from the thickness direction of the electrode body 11 is generally rectangular. The exterior body 21 is formed by overlapping rectangular sheets. In the present embodiment, the exterior body 21 is folded in half between the first sheet portion and the second sheet portion of a single rectangular sheet, and the first sheet portion and the second sheet are formed along three sides excluding the fold. It is formed by heat-sealing two sheet parts.

シートはラミネートフィルムであり、、金属箔と、金属箔の内側面に設けられた樹脂層と、金属箔の外側面に設けられた保護層と、を有する。金属箔は、例えばアルミニウムなどの水分や酸素を遮断する金属材料を用いて形成されている。樹脂層は、例えば、ポリエチレンやポリプロピレン、アイオノマー、エチレン‐メタクリレート共重合樹脂などの熱可塑性樹脂を用いて形成される。保護層は、例えばポリエチレンテレフタレートなどのポリエステル樹脂、あるいはナイロン樹脂を用いて形成される。外装体２１は、樹脂層同士が接触するようにシートを重ね合わせて形成される。また、シートは、裁断などにより矩形状に形成されるため、その端部は金属箔の断面が露出した状態になっている。   A sheet | seat is a laminate film, and has metal foil, the resin layer provided in the inner surface of metal foil, and the protective layer provided in the outer surface of metal foil. The metal foil is formed using a metal material that blocks moisture and oxygen, such as aluminum. The resin layer is formed using a thermoplastic resin such as polyethylene, polypropylene, ionomer, or ethylene-methacrylate copolymer resin. The protective layer is formed using, for example, a polyester resin such as polyethylene terephthalate or a nylon resin. The exterior body 21 is formed by stacking sheets so that the resin layers are in contact with each other. Further, since the sheet is formed in a rectangular shape by cutting or the like, the end portion is in a state where the cross section of the metal foil is exposed.

図１に示すように、外装体２１は、シートの間に電極体１１を収納した収納部２３を有する。
収納部２３は、シートの重ね合わせ方向から見て矩形状に形成され、電極体１１の一つの辺がシートの折り目（図１においては、外装体１１の周縁部２９のない部分）に略一致するように配置されている。 As shown in FIG. 1, the exterior body 21 includes a storage portion 23 that stores the electrode body 11 between sheets.
The storage portion 23 is formed in a rectangular shape when viewed from the sheet stacking direction, and one side of the electrode body 11 substantially coincides with the fold of the sheet (the portion without the peripheral edge portion 29 of the exterior body 11 in FIG. 1). Are arranged to be.

収納部２３は、プレス成形等により、電極体１１を収容するための凸部を形成されることが好ましい。だが、電極体が、比較的薄い場合は、必ずしもプレス成形する必要はない。重ねあわせたシートの１面にたわみを持たせ、もう一面に張力を持たせたまま熱融着する等して、片面に平面部、もう片面に凸部を形成してもよい。なお、片面が完全な平面にならなかった場合は、周縁部２９からの凸が大きいほうを凸部として扱う。   The housing part 23 is preferably formed with a convex part for housing the electrode body 11 by press molding or the like. However, when the electrode body is relatively thin, it is not always necessary to press-mold. A flat portion may be formed on one surface and a convex portion may be formed on the other surface by giving a deflection to one surface of the stacked sheets and heat-sealing with the other surface having a tension. In addition, when one side does not become a perfect plane, the one where the convex from the peripheral part 29 is large is handled as a convex part.

図１に示すように、外装体２１は、収納部２３の周囲においてシートを重ね合わせた周縁部２９を有する。
周縁部２９は、電極端子１３が引き出される第１辺と、第１辺と交差する第２辺、さらに、第２辺と交差する第３辺と、を有する。また、周縁部２９は、収納部２３の周囲を密封するようにシートが熱融着された状態となっており、重ね合わせたシートの樹脂層同士を融点程度まで加熱することで形成される。 熱融着は、ヒーターにより過熱された加熱プレスにて行われる。本実施形態では、まず、外装体２１を平板状のステージ部材に載置し、ステージ部材と所定の温度に加熱したヒーターとで外装体２１の周縁部２９を挟み込んで、第１辺と対向する第３辺を熱融着する。こうすることで、周縁部２９の第２辺を開口とする袋状の外装体２１を形成する。そして、この開口からシートの内側に電解液を注入した後に、熱融着していない周縁部２９の第２辺を熱融着することで、収納部２３を密封する。なお、樹脂層が例えばポリプロピレンで形成された場合、ポリプロピレンの融点は一般に１２０度から１４０度であるため、ヒーターの温度は１５０度程度であることが望ましい。 As shown in FIG. 1, the exterior body 21 has a peripheral portion 29 in which sheets are stacked around the storage portion 23.
The peripheral portion 29 has a first side from which the electrode terminal 13 is drawn, a second side that intersects the first side, and a third side that intersects the second side. The peripheral portion 29 is in a state where the sheets are heat-sealed so as to seal the periphery of the storage portion 23, and is formed by heating the resin layers of the stacked sheets to the melting point. The heat fusion is performed by a heating press heated by a heater. In this embodiment, first, the exterior body 21 is placed on a flat stage member, and the peripheral portion 29 of the exterior body 21 is sandwiched between the stage member and a heater heated to a predetermined temperature so as to face the first side. The third side is heat-sealed. By doing so, the bag-shaped exterior body 21 having the second side of the peripheral edge portion 29 as an opening is formed. And after inject | pouring electrolyte solution into the inside of a sheet | seat from this opening, the accommodating part 23 is sealed by heat-seal | fusing the 2nd edge | side of the peripheral part 29 which is not heat-seal | fused. When the resin layer is made of, for example, polypropylene, the melting point of polypropylene is generally 120 to 140 degrees, so the heater temperature is desirably about 150 degrees.

次に、図１（ａ）に示すように、周縁部２９の第３辺を中間部から折り返し、折り返し部３０ｂを形成する。さらに周縁部２９の第２辺を中間部から折り返し、折り返し部３０ａを形成する。   Next, as shown to Fig.1 (a), the 3rd edge | side of the peripheral part 29 is return | folded from an intermediate part, and the return | turnback part 30b is formed. Further, the second side of the peripheral portion 29 is folded back from the intermediate portion to form a folded portion 30a.

図１（ｂ）に示すように、折り返し部３０ａを周縁部２９上に設け、収納部２３の手前にすることにより、折り返し部３０ａが収納部２３に乗り上げて電気化学セル１１０の厚さを増加させることはなくなる。
これらの構成により、外装体２１の面積を小さくすることができる効果がある。 As shown in FIG. 1 (b), the folded portion 30 a is provided on the peripheral edge portion 29 and placed in front of the storage portion 23, so that the folded portion 30 a rides on the storage portion 23 and increases the thickness of the electrochemical cell 110. It wo n’t let you.
With these configurations, there is an effect that the area of the exterior body 21 can be reduced.

周縁部２９の端部の折り返す前は、シートの金属箔が露出した状態であり他の導電部との短絡の危険があった。しかし、本実施例に示すように折り返し部を形成することにより、他の導電部との短絡の確率を下げることが出来る。   Before the end of the peripheral edge 29 is folded back, the metal foil of the sheet is exposed and there is a danger of short circuit with other conductive parts. However, by forming the folded portion as shown in the present embodiment, it is possible to reduce the probability of a short circuit with another conductive portion.

また、図２は周縁部に絶縁テープを貼った場合を示した第１実施形態の電気化学セルの概略図である。図２において、（ａ）は平面図、（ｂ）は、第一直線２５で切った場合を仮定した断面図である。図２（ａ）に示すように、折り返された周縁部２９の端部である折り返し部３０ａ、折り返し部３０ｂは、絶縁テープ４１で被覆されてもよい。これにより、周縁部２９の第２辺、第３辺の端部のシートの金属箔が露出した部分（最端部）が被覆され、他の導電部との短絡をよりなくすことができる。また、折り返し部の開きを抑える役割も果たすため、電気化学セルを薄型に保つことも可能である。
この絶縁テープ４１は、電気絶縁性に優れ、高強度を有する点で、例えばポリイミドテープが好適である。 Moreover, FIG. 2 is the schematic of the electrochemical cell of 1st Embodiment which showed the case where the insulating tape was affixed on the peripheral part. 2A is a plan view, and FIG. 2B is a cross-sectional view assuming that the first straight line 25 is cut. As shown in FIG. 2A, the folded portion 30 a and the folded portion 30 b that are the end portions of the folded peripheral edge portion 29 may be covered with an insulating tape 41. Thereby, the part (endmost part) where the metal foil of the sheet | seat of the edge part of the 2nd edge | side of the peripheral part 29 and the 3rd edge | side was exposed is coat | covered, and a short circuit with another electrically conductive part can be eliminated more. Moreover, since it also serves to suppress the opening of the folded portion, the electrochemical cell can be kept thin.
The insulating tape 41 is preferably a polyimide tape, for example, because it has excellent electrical insulation and high strength.

このように、本実施形態の非水電解質二次電池１１０は、正極および負極を有する電極体１１と、シートを重ね合わせて形成され、電極体１１を収納する外装体２１と、を備える。外装体２１は、シートの間に電極体１１を収納した収納部２３と、収納部２３の周囲においてシートを密着させた周縁部２９と、を有する。周縁部２９の少なくとも一部は、収納部２３方向へ折り返されており、必要に応じ絶縁テープ４１で被覆されている、ことを特徴とする。
本実施形態によれば、電気化学セル１１０の面積を小さくでき、外部との短絡を防止することができるため、小形で、高信頼性の非水電解質二次電池を得ることができる。 As described above, the nonaqueous electrolyte secondary battery 110 of the present embodiment includes the electrode body 11 having the positive electrode and the negative electrode, and the exterior body 21 that is formed by stacking the sheets and that houses the electrode body 11. The exterior body 21 includes a storage portion 23 in which the electrode body 11 is stored between sheets, and a peripheral portion 29 in which the sheet is closely attached around the storage portion 23. At least a part of the peripheral edge portion 29 is folded in the direction of the storage portion 23 and is covered with an insulating tape 41 as necessary.
According to this embodiment, since the area of the electrochemical cell 110 can be reduced and a short circuit with the outside can be prevented, a small and highly reliable nonaqueous electrolyte secondary battery can be obtained.

（第２実施形態）
次に第２実施形態の電気化学セルについて説明する。
図３、図４及び図５は、第２実施形態の電気化学セルの概略図である。図３において、（ａ）は平面図、（ｂ）は、第一直線２５で切った場合を仮定した断面図、（ｃ）は周縁部を折り返す前の平面図である。図４は、周縁部に絶縁テープを貼った場合を示しており、（ａ）は平面図、（ｂ）は、第一直線２５で切った場合を仮定した断面図である。図５は、周縁部を加熱し、再溶着部を形成した場合の概略図であり、（ａ）は平面図、（ｂ）は、第一直線２５で切った場合を仮定した断面図である。 (Second Embodiment)
Next, the electrochemical cell of 2nd Embodiment is demonstrated.
3, 4 and 5 are schematic views of the electrochemical cell of the second embodiment. 3, (a) is a plan view, (b) is a cross-sectional view assuming a case where the first straight line 25 is cut, and (c) is a plan view before the periphery is folded back. 4A and 4B show a case where an insulating tape is applied to the peripheral edge, where FIG. 4A is a plan view and FIG. 4B is a cross-sectional view assuming a case where the first straight line 25 is cut. 5A and 5B are schematic views when the peripheral portion is heated to form a re-welded portion, where FIG. 5A is a plan view and FIG. 5B is a cross-sectional view assuming a case where the first straight line 25 is cut.

第２実施形態の電気化学セルは、図３（ｃ）に示したように、折り返す前の周縁部に切り欠きを設けた点、図５に示したように折り返し部を再加熱した点が、第１実施形態と異なっている。なお、第１実施形態と同様の構成となる部分については、詳細な説明を省略する。   As shown in FIG. 3C, the electrochemical cell of the second embodiment is provided with a notch in the peripheral edge before folding, and the point where the folded part is reheated as shown in FIG. This is different from the first embodiment. Note that detailed description of portions having the same configuration as in the first embodiment is omitted.

まず、図３（ｃ）に周縁部２９を折り返す前の平面図を示した。周縁部の図中、右下となる周縁部の交差部に切り欠き部３２を設けた。第１折り返し線２７ａ、２７ｂから折り返すことにより、図３（ａ）の折り返し部３０ａ、３０ｂを形成した。切り欠き部３２により、図３（ａ）の右下の部分は、折り返し部３０ａ、３０ｂが重ならない。そのため、当該箇所のみ、シートが過剰に重なることがなく、薄型構造を確保できた。   First, FIG. 3C shows a plan view before the peripheral edge 29 is folded back. In the drawing of the peripheral portion, a notch 32 is provided at the intersection of the peripheral portion at the lower right. By folding back from the first folding lines 27a and 27b, the folded portions 30a and 30b in FIG. 3A were formed. Due to the notch 32, the folded portions 30a and 30b do not overlap in the lower right portion of FIG. Therefore, the sheet is not excessively overlapped only at the portion, and a thin structure can be secured.

次に、図４（ａ）に示すように、折り返された周縁部２９の端部を、絶縁テープ４１で被覆した。これにより、周縁部２９の第２辺、第３辺の端部のシートの金属箔が露出した部分は、被覆されたことになり、他の導電部との短絡をより確実になくすことができる。   Next, as shown in FIG. 4A, the end portion of the folded peripheral edge portion 29 was covered with an insulating tape 41. Thereby, the part where the metal foil of the sheet | seat of the edge part of the 2nd edge | side of the peripheral part 29 and the 3rd edge | side was exposed will be coat | covered, and a short circuit with another electrically conductive part can be eliminated more reliably. .

図５（ａ）および（ｂ）に示すように、第一の加熱を行い、熱融着により封止した後、折り返し部３０ａ、３０ｂを形成し、さらにその後当該箇所に対して第二の加熱を行い、再熱溶着部４４を形成した。第一の加熱で硬化した樹脂層において、折り返し部３０ａ、３０ｂを形成するための折り曲げにより生じた白化部が、第二の加熱による再熱融着により再融解するため、白化部の微小なクラックが解消される。そのため、樹脂層の微小なクラックをパスとする外部からの水分の侵入や、電解液の漏れなどを抑制できる。また、樹脂層の微小なクラックをパスとして金属箔が電解液と接触することにより生じる合金化反応を抑制できる。したがって、耐久性の高い電気化学セルを得ることができる。
また、第二の加熱の際、折り返し部３０ａ、３０ｂを挟み込み、加圧することにより、折り返し部の厚さを薄く出来る。さらに、折り返し部の形状保持にも効果がある。 As shown in FIGS. 5A and 5B, after the first heating is performed and sealing is performed by heat sealing, the folded portions 30a and 30b are formed, and then the second heating is performed on the portion. The reheat welding part 44 was formed. In the resin layer cured by the first heating, the whitened portion generated by the bending to form the folded portions 30a and 30b is remelted by the reheat fusion by the second heating, so that a minute crack in the whitened portion is generated. Is resolved. For this reason, it is possible to suppress entry of moisture from the outside through a minute crack in the resin layer or leakage of the electrolyte. Moreover, the alloying reaction which arises when a metal foil contacts electrolyte solution by making the micro crack of a resin layer into a path | pass can be suppressed. Therefore, a highly durable electrochemical cell can be obtained.
In addition, the thickness of the folded portion can be reduced by sandwiching and pressing the folded portions 30a and 30b during the second heating. Furthermore, it is effective in maintaining the shape of the folded portion.

このように、本実施形態における非水電解質二次電池２１０は、折り返し部形成による厚さの増加や作業性の低下を改善することを特徴とする。また、折り返し部を再熱融着することにより、信頼性を向上した電気化学セルを得ることができる。   As described above, the nonaqueous electrolyte secondary battery 210 according to the present embodiment is characterized in that an increase in thickness and a decrease in workability due to the formation of the folded portion are improved. Moreover, the electrochemical cell which improved reliability can be obtained by reheat-welding a folding | returning part.

なお、切り欠き部３２の形状は特に限定されるものではなく、周縁部の図中、右下となる周縁部の交差部の重なりが、切り欠き部を設けない場合より重なり数が少なくなる形状であればよい。切り欠き部を設ける前の電気化学セルの形状を矩形とすると、図３（ｃ）の切り欠き部３２を設けるためには、周縁部の図中、右下となる周縁部の交差部を直角三角形に切り取る必要がある。この切り取る形状は、矩形としても、扇形としてもよく特に限定されるものではない、切り欠き部を設けない場合の最大４重の折り返しが、それ以下となればよい。   In addition, the shape of the notch 32 is not particularly limited, and in the figure of the periphery, the overlap of the intersection of the periphery at the lower right is a shape in which the number of overlaps is less than when no notch is provided. If it is. If the shape of the electrochemical cell before providing the notch is rectangular, in order to provide the notch 32 shown in FIG. 3C, the intersection of the lower right edge in the figure of the periphery is a right angle. It needs to be cut into triangles. The shape to be cut out may be rectangular or fan-shaped, and is not particularly limited. It is sufficient that the maximum four-fold folding when no notch is provided is less than that.

（第３実施形態）
次に第３実施形態の電気化学セルについて説明する。
図６は、第３実施形態の電気化学セルの概略図であり、（ａ）は平面図、（ｂ）は、第一直線２５で切った場合を仮定した断面図、（ｃ）は、周縁部を折り返す前の平面図である。図６に示す第３実施形態では、折り返し部が多重になっている点で、第１実施形態および第２実施形態とは異なっている。なお、第１実施形態および第２実施形態と同様の構成となる部分については、詳細な説明を省略する。 (Third embodiment)
Next, the electrochemical cell of 3rd Embodiment is demonstrated.
6A and 6B are schematic views of the electrochemical cell according to the third embodiment, where FIG. 6A is a plan view, FIG. 6B is a cross-sectional view assuming that the first straight line 25 is cut, and FIG. It is a top view before turning up. The third embodiment shown in FIG. 6 is different from the first embodiment and the second embodiment in that the folded portion is multiplexed. In addition, detailed description is abbreviate | omitted about the part used as the structure similar to 1st Embodiment and 2nd Embodiment.

図６（ｃ）に周縁部２９を折り返す前の平面図を示した。周縁部の図中、右下となる周縁部の交差部に切り欠き部３２を設けた。第２折り返し線２８ａ、２８ｂから折り返し、
さらに第１折り返し線２７ａ、２７ｂから折り返すことにより、図６（ａ）の折り返し部３０ａ、３０ｂを形成した。 FIG. 6C shows a plan view before the peripheral edge 29 is folded back. In the drawing of the peripheral portion, a notch 32 is provided at the intersection of the peripheral portion at the lower right. Folded from the second folding lines 28a, 28b,
Further, the folded portions 30a and 30b of FIG. 6A were formed by folding back from the first folding lines 27a and 27b.

これにより、周縁部２９の第２辺、第３辺の端部のシートの金属箔が露出した部分は、シート表面の保護層と近接し被覆されたことになり、他の導電部との短絡をより確実になくすことができる。そのため、絶縁テープを削減することができる。また、この場合、折り返し部の厚みは、外装体２１を含めた収納部２３の厚みよりも薄ければ、何重に折り返してもよい。また、周縁部２９を多重に折り返ししているため、第一実施形態及び第二実施形態と比較して折り返し部がやや厚くなるため、図５で示した再溶着部を形成することは有効である。   As a result, the exposed portions of the metal foil of the sheet on the second side and the third side of the peripheral edge 29 are close to and covered with the protective layer on the sheet surface, and are short-circuited with other conductive parts. Can be eliminated more reliably. Therefore, the insulating tape can be reduced. In this case, the folded portion may be folded back multiple times as long as the thickness of the folded portion is smaller than the thickness of the storage portion 23 including the exterior body 21. In addition, since the peripheral portion 29 is folded back multiple times, the folded portion is slightly thicker than in the first embodiment and the second embodiment, so it is effective to form the re-welded portion shown in FIG. is there.

このように、本実施形態における非水電解質二次電池３１０は、折り返し部形成による厚さ増を改善することを特徴とする。また、絶縁テープを削減できるため、コスト的に優位な電気化学セルを得ることができる。   As described above, the nonaqueous electrolyte secondary battery 310 according to the present embodiment is characterized in that the increase in thickness due to the formation of the folded portion is improved. Moreover, since the insulating tape can be reduced, an electrochemical cell superior in cost can be obtained.

また、シートを熱融着して封止を行う電気化学セルの場合、周縁部自体の面積を小さくすると、封止性が低下し、電気化学セル内への水分進入などにより性能が劣化することがある。そのため、周縁部の幅として３ｍｍ程度は確保する必要がある。厚さが３ｍｍ以下の電気化学セルの場合は、従来のように周縁部を厚み方向に折り曲げると、電気化学セルよりはみ出すことになり、外形寸法を薄型とすることが出来ないという課題があった。そのため、本発明は、電極体を収納した収納部における厚さが３ｍｍ以下の電気化学セルの場合に、特に有効であり、封止性を確保しつつ、薄型の電気化学セルを提供することできる。   In addition, in the case of an electrochemical cell that is sealed by heat-sealing the sheet, if the area of the peripheral edge itself is reduced, the sealing performance is lowered, and the performance deteriorates due to moisture entering the electrochemical cell. There is. Therefore, it is necessary to ensure about 3 mm as the width of the peripheral portion. In the case of an electrochemical cell having a thickness of 3 mm or less, when the peripheral edge portion is bent in the thickness direction as in the prior art, it protrudes from the electrochemical cell and there is a problem that the outer dimensions cannot be reduced. . Therefore, the present invention is particularly effective in the case of an electrochemical cell having a thickness of 3 mm or less in the housing portion that houses the electrode body, and can provide a thin electrochemical cell while ensuring sealing properties. .

また、３辺の周縁部のうち少なくとも一つを折り返せば、面積削減の効果があるが、電極端子が出ていない２つを折り返せばより、面積を削減した電気化学セルが提供できるためより有効である。   In addition, if at least one of the three peripheral edges is folded, the area can be reduced. However, if the two that do not have electrode terminals are folded, an electrochemical cell with a reduced area can be provided, which is more effective. It is.

なお、この発明は上述した実施形態に限られるものではない。
例えば、上記実施形態においては、電気化学セルの一例として、非水電解質二次電池を例に挙げて説明したが、電気二重層キャパシタや一次電池であってもよい。 The present invention is not limited to the embodiment described above.
For example, in the above embodiment, a non-aqueous electrolyte secondary battery has been described as an example of an electrochemical cell, but an electric double layer capacitor or a primary battery may be used.

１１０、２１０、３１０…非水電解質二次電池（電気化学セル）
１１…電極体
１３…電極端子
２１…外装体
２３…収納部
２５…第１直線
２７ａ、２７ｂ…第１折り返し線
２８ａ、２８ｂ…第２折り返し線
２９…周縁部
３０ａ、３０ｂ…折り返し部
３２…切り欠き部
４１ａ、４１ｂ…絶縁テープ
４４…再熱融着部 110, 210, 310 ... non-aqueous electrolyte secondary battery (electrochemical cell)
DESCRIPTION OF SYMBOLS 11 ... Electrode body 13 ... Electrode terminal 21 ... Exterior body 23 ... Storage part 25 ... 1st straight line 27a, 27b ... 1st return line 28a, 28b ... 2nd return line 29 ... Peripheral part 30a, 30b ... Return part 32 ... Cut Notches 41a, 41b ... insulating tape 44 ... reheat fusion part

Claims (5)

正極および負極を有し、１対の電極端子を有する電極体と、
シートを重ね合わせて形成され、前記電極体を収納する外装体と、を備え、
前記外装体は、
前記シートの間に前記電極体を収納した収納部と、
前記収納部の周囲において前記シートの３辺を密着させた周縁部と、
を有し、
前記周縁部の少なくとも一部は、前記周縁部上で前記収納部方向に折り返されて折り返し部を形成し、
前記折り返し部は、前記収納部の厚みより薄くなっており、
前記収納部は、前記電極体から見て外側の方向に凸部を有し、
前記折り返し部は前記凸部側に折り返されることを特徴とする電気化学セル。 An electrode body having a positive electrode and a negative electrode and having a pair of electrode terminals;
Formed by overlapping sheets, and an exterior body that houses the electrode body,
The exterior body is
A storage section storing the electrode body between the sheets;
A peripheral portion in which the three sides of the sheet are in close contact with each other around the storage portion;
Have
At least a part of the peripheral part is folded back toward the storage part on the peripheral part to form a folded part,
The folded portion is thinner than the thickness of the storage portion,
The storage portion has a convex portion in an outer direction when viewed from the electrode body,
The electrochemical cell, wherein the folded portion is folded toward the convex portion side. 前記周縁部のうち、前記電極端子を出していない２辺の前記周縁部が交差する箇所に切り欠き部を設けることを特徴とする請求項１に記載の電気化学セル。   2. The electrochemical cell according to claim 1, wherein a cutout portion is provided at a location where the peripheral portions of two sides of the peripheral portion that do not protrude the electrode terminal intersect. 前記折り返し部が、再熱融着されていることを特徴とする請求項１または２に記載の電気化学セル。   The electrochemical cell according to claim 1 or 2, wherein the folded portion is reheat-sealed. 前記周縁部はシートの金属箔が露出した最端部を有し、前記最端部は絶縁テープで被覆されていることを特徴とする請求項１から３のいずれか一項に記載の電気化学セル。   4. The electrochemical according to claim 1, wherein the peripheral portion has an endmost portion where the metal foil of the sheet is exposed, and the endmost portion is covered with an insulating tape. cell. 前記収納部の厚さが３ｍｍ以下であることを特徴とする請求項１から４のいずれか一項に記載の電気化学セル。   The electrochemical cell according to any one of claims 1 to 4, wherein the storage portion has a thickness of 3 mm or less.
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