JP5561775B2 - Film-clad battery and manufacturing method thereof - Google Patents
Film-clad battery and manufacturing method thereof Download PDFInfo
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- JP5561775B2 JP5561775B2 JP2010186175A JP2010186175A JP5561775B2 JP 5561775 B2 JP5561775 B2 JP 5561775B2 JP 2010186175 A JP2010186175 A JP 2010186175A JP 2010186175 A JP2010186175 A JP 2010186175A JP 5561775 B2 JP5561775 B2 JP 5561775B2
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- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 22
- 239000002184 metal Substances 0.000 claims description 22
- 239000011347 resin Substances 0.000 claims description 16
- 229920005989 resin Polymers 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 6
- 238000004049 embossing Methods 0.000 claims description 4
- 238000009751 slip forming Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 31
- 239000000463 material Substances 0.000 description 22
- 238000003466 welding Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 239000011888 foil Substances 0.000 description 3
- -1 moisture Substances 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
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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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- Sealing Battery Cases Or Jackets (AREA)
Description
本発明は、電池要素をフィルムで包み込んだフィルム外装型電池、およびその製造方法に関する。 The present invention relates to a film-clad battery in which battery elements are wrapped with a film, and a method for manufacturing the same.
近年、電気自動車やハイブリッド自動車の普及に伴って、これらの駆動用電源としてリチウムイオン二次電池に代表される非水電解液二次電池の開発が盛んに行われている。このような電池は、一般的に、複数の正極シートと複数の負極シートがセパレータを介して積層された電池要素を、外装材に収容した構造となっている。2層構造の外装材で電池要素を包み込んだ電池が特許文献1に開示されている。 In recent years, with the widespread use of electric vehicles and hybrid vehicles, non-aqueous electrolyte secondary batteries represented by lithium ion secondary batteries have been actively developed as power sources for driving them. Such a battery generally has a structure in which a battery element in which a plurality of positive electrode sheets and a plurality of negative electrode sheets are laminated via a separator is accommodated in an exterior material. Patent Document 1 discloses a battery in which a battery element is wrapped with a two-layer exterior material.
図5は、特許文献1に開示されたシート材型電池の構成を示す断面図である。図5に示すシート材型電池100は、電池用発電要素40を挟み込む凹凸板材18、20を有する。凹凸板材18、20には、電池用発電要素40を挟み込む面と反対側の面に凹凸形状が形成されている。凹凸板材18の凹凸形状に沿ってシート材22が凹凸板材18に積層され、凹凸板材20の凹凸形状に沿ってシート材23が凹凸板材20に積層されている。これにより、シート材22、23の外表面に、凸部30と凹部32とからなる凸凹形状が形成される。この凸凹形状により、電池用発電要素40の表面部分の放熱面積が増大するので、放熱性を改善することが可能となる。
FIG. 5 is a cross-sectional view showing the configuration of the sheet material type battery disclosed in Patent Document 1. As shown in FIG. The sheet
電気自動車やハイブリッド自動車の駆動用電源として用いられる電池の開発においては、軽量化、薄型化が強く要求されている。そのため、電池要素の外装材に関しても、軽量化、薄型化を実現するために金属缶ケースに代わってフィルムが使用され始めている。外装材がフィルムの場合、フィルムが柔らかいため、フィルムの外表面全体が平坦であると搬送工程や検査工程で傷や打痕が付きやすくなる。特許文献1に記載のシート材22、23では、凸部30の先端が丸みを帯びているので、外表面全体が平坦なフィルムに比べ傷や打痕が付きにくい。しかし、シート部材22、23に形成された凹凸形状では、凸部30が分散して配置され、平坦な凹部32がシート部材22、23の大部分を占めている。したがって、特許文献1に記載のフィルム外装型電池は、傷や打痕による損傷の防止効果が低い。
In the development of a battery used as a driving power source for an electric vehicle or a hybrid vehicle, weight reduction and thinning are strongly demanded. For this reason, a film has begun to be used in place of a metal can case in order to achieve a reduction in weight and thickness of a battery element exterior material. When the exterior material is a film, since the film is soft, if the entire outer surface of the film is flat, scratches and dents are easily formed in the transport process and the inspection process. In the
そこで、本発明は、傷や打痕による損傷の防止効果を高めることが可能なフィルム外装型電池およびその製造方法を提供することを目的とする。 Then, an object of this invention is to provide the film exterior type | mold battery which can raise the prevention effect of the damage by a damage | wound or a dent, and its manufacturing method.
上記目的を達成するため本発明によるフィルム外装型電池は、電池要素と、前記電池要素を包み込んだフィルムと、を有し、前記フィルムの外表面全体に、先端が丸みを帯びた凸形状が連続して形成され、前記フィルムの内表面が平坦である。 In order to achieve the above object, a film-clad battery according to the present invention has a battery element and a film enclosing the battery element, and a convex shape with a rounded tip is continuously formed on the entire outer surface of the film. The inner surface of the film is flat .
また、上記目的を達成するため本発明によるフィルム外装型電池の製造方法は、フィルムの外表面全体に、先端が丸みを帯びた凸形状を連続して形成する工程と、前記凸形状が形成され、かつ内表面が平坦なフィルムで、電池要素を包み込む工程と、を有する。 In addition, in order to achieve the above object, the film-clad battery manufacturing method according to the present invention includes a step of continuously forming a convex shape with a rounded tip on the entire outer surface of the film, and the convex shape is formed. And wrapping the battery element with a film having a flat inner surface .
本発明によれば、フィルムの外表面に形成された凸形状は、先端部が丸みを帯び、かつ連続している。そのため、凸部が分散して配置された構造に比べ、フィルムの外表面に傷や打痕が付きにくくなる。よって、傷や打痕による損傷の防止効果を高めることが可能となる。 According to the present invention, the convex shape formed on the outer surface of the film has a rounded tip and is continuous. Therefore, compared with the structure where the convex portions are dispersed and arranged, the outer surface of the film is less likely to be scratched or dented. Therefore, it is possible to enhance the effect of preventing damage due to scratches and dents.
図1は、本発明のフィルム外装型電池の一実施形態を示す分解斜視図である。まず、本実施形態のフィルム外装型電池の構成について説明する。 FIG. 1 is an exploded perspective view showing an embodiment of a film-clad battery of the present invention. First, the structure of the film-clad battery of this embodiment will be described.
図1に示すフィルム外装型電池1は、一対のフィルム2を有する。各フィルム2には、窪みが形成されている。各フィルム2の外周部(窪みの周辺部)は、熱融着にて気密に接着される。フィルム2の接着時に、フィルム2の窪みによって内部空間が形成される。その内部空間には電池要素3が収容されている。電池要素3の両端部の各々からは正極集電部4と負極集電部5とが引き出されている。正極集電部4には正極タブ6が接続されている。負極集電部5には負極タブ7が接続されている。 A film-clad battery 1 shown in FIG. 1 has a pair of films 2. Each film 2 is formed with a depression. The outer peripheral part (periphery part of a hollow) of each film 2 is adhere | attached airtightly by heat sealing | fusion. When the film 2 is bonded, an internal space is formed by the depression of the film 2. The battery element 3 is accommodated in the internal space. A positive electrode current collector 4 and a negative electrode current collector 5 are drawn out from both ends of the battery element 3. A positive electrode tab 6 is connected to the positive electrode current collector 4. A negative electrode tab 7 is connected to the negative electrode current collector 5.
電池要素3では、複数の正極シートおよび複数の負極シートが、セパレータを介して(挟んで)積層されている。各正極シートおよび各負極シートは、金属箔などからなる集電体上の所定の領域に活物質層を均一に塗布することによって形成される。 In the battery element 3, a plurality of positive electrode sheets and a plurality of negative electrode sheets are stacked with (separated) via separators. Each positive electrode sheet and each negative electrode sheet are formed by uniformly applying an active material layer to a predetermined region on a current collector made of a metal foil or the like.
正極集電部4は、電池要素3の一端側で、複数の正極シート同士を接続するように構成されている。負極集電部5は、電池要素3の他端側で、複数の負極シート同士を接続するように構成されている。正極シート同士の接続は、各正極シートにおける金属箔の活物質未塗布部分を、正極タブ6と共に超音波溶接等の溶接により一括して行われる。一方、負極シート同士の接続も、同様に、各負極シートにおける金属箔の活物質未塗布部分を、負極タブ7と共に超音波溶接等の溶接により一括して行われる。正極集電部4における正極タブ6と超音波溶接による接続部分と、正極タブ6の端部とを覆う領域には、保護シート8が貼り付けられている。正極タブ6および負極タブ7は、フィルム2同士の接合部分である外周部から外側に延出している。 The positive electrode current collector 4 is configured to connect a plurality of positive electrode sheets on one end side of the battery element 3. The negative electrode current collector 5 is configured to connect a plurality of negative electrode sheets on the other end side of the battery element 3. The positive electrode sheets are connected together by welding, such as ultrasonic welding, together with the positive electrode tab 6 on the active material uncoated portion of the metal foil in each positive electrode sheet. On the other hand, the connection between the negative electrode sheets is also collectively performed by welding, such as ultrasonic welding, together with the negative electrode tab 7 on the non-coated portion of the metal foil in each negative electrode sheet. A protective sheet 8 is attached to a region covering the positive electrode tab 6, the connection portion by ultrasonic welding, and the end of the positive electrode tab 6 in the positive electrode current collector 4. The positive electrode tab 6 and the negative electrode tab 7 extend outward from the outer peripheral portion which is a joint portion between the films 2.
図2は、フィルム2の構造を示す断面図である。図2に示すように、フィルム2は、金属層10の両面に樹脂層11(第1の樹脂層)と、樹脂層12(第2の樹脂層)とが個別に積層された3層構造のラミネートフィルムである。 FIG. 2 is a cross-sectional view showing the structure of the film 2. As shown in FIG. 2, the film 2 has a three-layer structure in which a resin layer 11 (first resin layer) and a resin layer 12 (second resin layer) are individually laminated on both surfaces of a metal layer 10. Laminated film.
金属層10は、薄いアルミニウム膜からなる。なお、金属層10の材料は、アルミニウムに限定されるものではなく、電池要素3に注入される電解液、水分、およびガスの透過を防止することが可能な金属であればよい。金属層10において、樹脂層11が積層される面(一方の面)には、複数の凸部13が形成されている。各凸部13は、図2に示すように、先端が丸みを帯びている。また、各凸部13は、連続している(互いに隣接している)。 The metal layer 10 is made of a thin aluminum film. The material of the metal layer 10 is not limited to aluminum, and may be any metal that can prevent permeation of the electrolyte, moisture, and gas injected into the battery element 3. In the metal layer 10, a plurality of convex portions 13 are formed on the surface (one surface) on which the resin layer 11 is laminated. As shown in FIG. 2, each convex portion 13 has a rounded tip. Moreover, each convex part 13 is continuing (it adjoins mutually).
樹脂層11は、凸部13の形状に沿って金属層10に積層されている。樹脂層11は、フィルム2の外表面を構成し、金属層10の保護層として機能する。樹脂層12は、金属層10における樹脂層11が積層された面と反対側の面(他方の面)に積層されている。樹脂層12は、外周部分が熱融着され、ヒートシール層として機能する。樹脂層11、12の材料としては、ナイロン、ポリエチレン、ポリプロピレンに代表されるプラスチックが適用できる。 The resin layer 11 is laminated on the metal layer 10 along the shape of the convex portion 13. The resin layer 11 constitutes the outer surface of the film 2 and functions as a protective layer for the metal layer 10. The resin layer 12 is laminated on the surface (the other surface) opposite to the surface on which the resin layer 11 of the metal layer 10 is laminated. The outer peripheral portion of the resin layer 12 is heat-sealed and functions as a heat seal layer. As the material of the resin layers 11 and 12, plastics represented by nylon, polyethylene, and polypropylene can be applied.
次に、フィルム外装型電池1の製造方法について説明する。 Next, the manufacturing method of the film-clad battery 1 is demonstrated.
まず、金属層10に上述した凸部13をシボ加工で形成する。図3は、本実施形態におけるシボ加工の方法を示す模式図である。本実施形態では、図3に示すように、エアーブラスト(サンドブラスト)14が噴射材15を金属層10の表面に投射することによって、凸部13が形成される。なお、凸部13の高さH(図3参照)は、金属層10の厚さを考慮して0.020mm以下とすることが望ましい。金属層10に凸部13を形成した後は、樹脂層11、12の各々が金属層10に積層される。これによりフィルム2が完成する。 First, the convex part 13 mentioned above is formed in the metal layer 10 by embossing. FIG. 3 is a schematic diagram showing the embossing method in the present embodiment. In the present embodiment, as shown in FIG. 3, the air blast (sand blast) 14 projects the spray material 15 onto the surface of the metal layer 10, whereby the convex portion 13 is formed. The height H (see FIG. 3) of the convex portion 13 is preferably 0.020 mm or less in consideration of the thickness of the metal layer 10. After forming the convex portion 13 on the metal layer 10, each of the resin layers 11 and 12 is laminated on the metal layer 10. Thereby, the film 2 is completed.
続いて、1対のフィルム2で電池要素3を収納する(包み込む)。そして、電池要素3に電解液を注入した後、樹脂膜12の外周部を熱融着して電池要素3を気密に封止する。これにより、図4に示すようにフィルム外装型電池1が完成する。 Subsequently, the battery element 3 is housed (wrapped) with a pair of films 2. And after inject | pouring electrolyte solution into the battery element 3, the outer peripheral part of the resin film 12 is heat-sealed, and the battery element 3 is sealed airtightly. Thereby, the film-clad battery 1 is completed as shown in FIG.
上述した工程を経て製造されたフィルム外装型電池1では、フィルム2の外表面に、先端部が丸みを帯びた凸形状が連続して形成されている。そのため、図5に示す凹凸形状に比べ、傷、打痕で金属層10が損傷しにくくなる。そのため、フィルム2の絶縁性の低下、および亀裂などによる空気の侵入という問題を防止することができる。その結果、電池の長期信頼性が向上する効果が得られる。 In the film-clad battery 1 manufactured through the above-described steps, a convex shape with a rounded tip is continuously formed on the outer surface of the film 2. Therefore, compared to the uneven shape shown in FIG. 5, the metal layer 10 is less likely to be damaged by scratches and dents. Therefore, it is possible to prevent the problem of air intrusion due to a decrease in insulating properties of the film 2 and cracks. As a result, an effect of improving the long-term reliability of the battery can be obtained.
また、フィルム2の外表面に形成された凸形状が摩擦抵抗となり、フィルム2の外表面が滑りにくくなるので、持ち運びの際に落下しにくくなる。 Moreover, since the convex shape formed on the outer surface of the film 2 becomes a frictional resistance and the outer surface of the film 2 becomes less slippery, it becomes difficult to fall during carrying.
1 フィルム外装型電池
2 フィルム
3 電池要素
4 正極集電部
5 負極集電部
6 正極タブ
7 負極タブ
8 保護シート
10 金属層
11、12 樹脂層
13 凸部
14 エアーブラスト
15 噴射剤
18、20 凹凸板材
22、23 シート材
30 凸部
32 凹部
40 電池用発電要素
100 シート材型電池
DESCRIPTION OF SYMBOLS 1 Film exterior type battery 2 Film 3 Battery element 4 Positive electrode current collection part 5 Negative electrode current collection part 6 Positive electrode tab 7 Negative electrode tab 8 Protective sheet 10 Metal layer 11, 12 Resin layer 13 Convex part 14 Air blast 15
Claims (4)
前記電池要素を包み込んだフィルムと、を有し、
前記フィルムの外表面全体に、先端が丸みを帯びた凸形状が連続して形成され、かつ前記フィルムの内表面が平坦である、フィルム外装型電池。 A battery element;
A film enclosing the battery element,
A film-clad battery in which a convex shape having a rounded tip is continuously formed on the entire outer surface of the film and the inner surface of the film is flat .
前記凸形状が形成され、かつ内表面が平坦なフィルムで、電池要素を包み込む工程と、
を有する、フィルム外装型電池の製造方法。 A step of continuously forming a rounded convex shape on the entire outer surface of the film;
A process in which the convex shape is formed and the inner surface is flat and the battery element is wrapped;
A method for producing a film-clad battery, comprising:
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