JP6935784B2 - How to manufacture a secondary battery - Google Patents

How to manufacture a secondary battery Download PDF

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JP6935784B2
JP6935784B2 JP2018096510A JP2018096510A JP6935784B2 JP 6935784 B2 JP6935784 B2 JP 6935784B2 JP 2018096510 A JP2018096510 A JP 2018096510A JP 2018096510 A JP2018096510 A JP 2018096510A JP 6935784 B2 JP6935784 B2 JP 6935784B2
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pressing plate
end portion
bent
secondary battery
bending
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JP2019200973A (en
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貞雄 藤崎
貞雄 藤崎
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Toyota Motor Corp
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

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  • Bending Of Plates, Rods, And Pipes (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Description

本願は二次電池の製造方法に関し、詳しくは折り曲げ部が形成された二次電池の製造方法である。 The present application relates to a method for manufacturing a secondary battery, and more particularly, a method for manufacturing a secondary battery in which a bent portion is formed.

ラミネート加工が施された全固体電池のエネルギー密度を向上させるために、ラミネート外装体の端部を折り曲げて全固体電池の体積効率を上げることは有効な手段である。外装体の構造上、内部に封入された電極体に向かう方向に折り曲げることが最も体積効率が高い。 In order to improve the energy density of the laminated all-solid-state battery, it is an effective means to bend the end portion of the laminated exterior body to increase the volumetric efficiency of the all-solid-state battery. Due to the structure of the exterior body, it is most volumetrically efficient to bend it in the direction toward the electrode body enclosed inside.

ここで、従来のラミネート外装体の折り曲げ方法について説明する。図7(A)は内部に電極体が封入されたラミネート外装体の端部に注目した断面図である。従来から行われている方法は、この端部をまず折り曲げ(図7(B))、そして内部電極体に向かって押し付け板を押し付ける(図7(C))ことにより、外装体に折り曲げ部を形成させている。しかしながら、ラミネート機能を保持したまま折り曲げを行うことが前提のため、従来の方法では端部をしっかりと折り曲げることができず、スプリングバックにより折り曲げ部が開く問題があった(図7(D))。 Here, a method of bending a conventional laminated exterior body will be described. FIG. 7A is a cross-sectional view focusing on the end portion of the laminated exterior body in which the electrode body is enclosed. In the conventional method, the bent portion is first bent (FIG. 7 (B)) and then the pressing plate is pressed toward the internal electrode body (FIG. 7 (C)) to form the bent portion on the outer body. It is forming. However, since it is premised that the bent portion is bent while maintaining the laminating function, the end portion cannot be bent firmly by the conventional method, and there is a problem that the bent portion is opened by the springback (FIG. 7 (D)). ..

そこで、特許文献1では折り曲げ部が開いてくる問題を解決する手段として、薄板で形成した容器に折り曲げ加工を施して縁曲げ部を形成する折り曲げ成形方法を開示している。具体的には、第一のプレス金型を形成するパンチの先端が縁曲げ部の折り曲げ基点を押圧しない位置に保持された後、パンチと対向するダイにより縁曲げ部の折り曲げ基点から折り曲げを行う予備曲げ工程と、予備曲げ工程で折り曲げられた縁曲げ部に対して、第二のプレス金型を形成するダイにより容器の側壁方向に加圧して、縁曲げ部を容器の側壁に対して鋭角に成形する鋭角折り曲げ工程とを有することを開示している。また、予備曲げ工程及び鋭角折り曲げ工程のそれぞれにおいて、温間加工を行うことも記載されている。これによれば、しっかりと端部を折り曲げることができるため、形成された縁曲げ部(折り曲げ部)が開くことが抑制されると考えられる。 Therefore, Patent Document 1 discloses a bending molding method in which a container formed of a thin plate is bent to form an edge bending portion as a means for solving the problem that the bent portion is opened. Specifically, after the tip of the punch forming the first press die is held at a position where the bending base point of the edge bending portion is not pressed, bending is performed from the bending base point of the edge bending portion by a die facing the punch. The pre-bending step and the edge-bent portion bent in the pre-bending step are pressed in the direction of the side wall of the container by the die forming the second press die, and the edge-bent portion is acutely angled with respect to the side wall of the container. It discloses that it has an acute-angled bending step of forming into. It is also described that warm working is performed in each of the preliminary bending step and the acute angle bending step. According to this, since the end portion can be bent firmly, it is considered that the formed edge bending portion (bending portion) is suppressed from opening.

特開2002−331309号公報Japanese Unexamined Patent Publication No. 2002-331309

しかしながら、特許文献1に記載の方法は折り曲げ部の形成に予備曲げ工程及び鋭角折り曲げ工程の2つの工程を要し、かつ、各工程で使用する金型もそれぞれ異なっており、方法の簡易化に改善の余地があった。また、特許文献1に記載の方法においても、図7(C)に記載したように内部の電極体に向かって押し付け板を押し付けているため、内部の電極体を破損する虞があった。 However, the method described in Patent Document 1 requires two steps, a preliminary bending step and an acute-angle bending step, for forming the bent portion, and the molds used in each step are also different, so that the method can be simplified. There was room for improvement. Further, also in the method described in Patent Document 1, since the pressing plate is pressed toward the internal electrode body as described in FIG. 7 (C), there is a risk of damaging the internal electrode body.

そこで、本願は簡易な方法で外装体の内部に封入されている電池要素へのダメージを抑制しつつ、端部に折り曲げ部を有する二次電池を製造する方法を提供することを課題とする。 Therefore, it is an object of the present application to provide a method for manufacturing a secondary battery having a bent portion at an end while suppressing damage to a battery element enclosed inside the exterior body by a simple method.

上記問題を解決するために、本発明者が鋭意検討した結果、押し付け板に2つの傾斜形状を設けることにより、外装体端部の折り曲げ工程及び押し付け工程を1つの工程に集約できることを知見した。また、端部を電極体に向かう方向に押し付ける際に、押し付け板と押さえ板とで端部を挟持することにより、押し付けによる内部の電池要素へのダメージを抑制できることを知見した。 As a result of diligent studies by the present inventor in order to solve the above problems, it has been found that by providing the pressing plate with two inclined shapes, the bending process and the pressing process of the end portion of the exterior body can be integrated into one process. It was also found that when the end portion is pressed in the direction toward the electrode body, the damage to the internal battery element due to the pressing can be suppressed by sandwiching the end portion between the pressing plate and the pressing plate.

よって、本願は上記知見に基づき、上記課題を解決するための一つの手段として、ラミネート加工をした二次電池の外装体において、少なくとも1つの端部に折り曲げ部を有する二次電池の製造方法であって、外装体の端部の折り曲げの基点に押さえ板を当接させる工程と、当接させる工程後、端部を挟むように押さえ板と押さえ板に対向する位置に配置されている押し付け板とを摺動させて、基点を中心に端部を折り曲げるとともに、押さえ板と押し付け板とで端部を挟持することにより折り曲げ部を形成する工程と、を備え、押し付け板の端部と摺動する面は、端部の折り曲げを行う傾斜面と端部を挟持する挟持面とを有し、傾斜面は押し付け板の幅方向に直交する断面において、押し付け板の断面積が摺動方向に狭まるように傾斜しており、傾斜面は前記幅方向に傾斜している、二次電池の製造方法を開示する。 Therefore, based on the above findings, as one means for solving the above problems, the present application is a method for manufacturing a secondary battery having a bent portion at at least one end in the exterior body of the laminated secondary battery. There is a step of bringing the holding plate into contact with the bending base point of the end of the exterior body, and after the step of bringing the holding plate into contact, the pressing plate is arranged at a position facing the holding plate and the holding plate so as to sandwich the end. The step of forming a bent portion by sandwiching the end portion between the pressing plate and the pressing plate while bending the end portion around the base point by sliding and sliding with the end portion of the pressing plate. The surface to be processed has an inclined surface for bending the end portion and a holding surface for sandwiching the end portion, and the inclined surface has a cross section orthogonal to the width direction of the pressing plate, and the cross-sectional area of the pressing plate is narrowed in the sliding direction. Disclosed is a method for manufacturing a secondary battery, which is inclined as described above and the inclined surface is inclined in the width direction.

本願が開示する二次電池の製造方法によれば、簡易な方法で外装体の内部に封入されている電池要素へのダメージを抑制しつつ、端部に折り曲げ部を有する二次電池を製造することができる。 According to the method for manufacturing a secondary battery disclosed in the present application, a secondary battery having a bent portion at an end is manufactured while suppressing damage to a battery element enclosed inside the exterior body by a simple method. be able to.

製造方法10のフローチャートである。It is a flowchart of manufacturing method 10. 外装体1を説明する図である。(A)は外装体1の概観図である。(B)は(A)においてXで示した部分の断面図である。(C)は(B)において折り曲げ部1cが形成された外装体1の端部を説明する図である。It is a figure explaining the exterior body 1. (A) is an overview view of the exterior body 1. (B) is a cross-sectional view of a portion represented by X in (A). (C) is a figure explaining the end portion of the exterior body 1 in which the bent portion 1c was formed in (B). 工程S1を説明する図である。(A)は基点Oに押さえ板2を当接させる前の様子を表している。(B)は基点Oに押さえ板2を当接させた後の様子を表している。It is a figure explaining process S1. (A) shows the state before the pressing plate 2 is brought into contact with the base point O. (B) shows the state after the pressing plate 2 is brought into contact with the base point O. 工程S2を説明する図である。(A)は工程S1を終えた状態を表している。(B)は基点Oを中心に端部1bを折り曲げる様子を表している。(C)は押さえ板2と押し付け板3とで端部1bを挟持する様子を表している。It is a figure explaining process S2. (A) represents a state in which step S1 is completed. (B) shows a state in which the end portion 1b is bent around the base point O. (C) shows a state in which the end portion 1b is sandwiched between the pressing plate 2 and the pressing plate 3. 押し付け板3の形状を説明する図である。(A)は押し付け板3の幅方向に直交する断面の図である。(B)は(A)のYの方向(紙面右側)から見た押し付け板3の側面図である。It is a figure explaining the shape of the pressing plate 3. (A) is a cross-sectional view of the pressing plate 3 orthogonal to the width direction. (B) is a side view of the pressing plate 3 as seen from the Y direction (right side of the paper surface) of (A). 押し付けバックアップ4を用いた場合の工程S2の概略図である。(A)は押し付けバックアップ4を配置し、押し付け方向への力を増大させた様子を示す図である。(B)は端部1bの折り曲げを鋭角化するために、押さえ板20を用いた図である。(C)は弾性を有する押し付け板32を用いた図である。It is the schematic of the process S2 when the pressing backup 4 is used. (A) is a figure which shows how the pressing backup 4 was arranged and the force in the pressing direction was increased. (B) is a figure which used the holding plate 20 in order to sharpen the bending of the end portion 1b. (C) is a figure using a pressing plate 32 having elasticity. 従来の折り曲げ部形成方法を説明する図である。(A)はラミネート外装体を示している。(B)はラミネート外装体の端部を折り曲げる様子を表している。(C)はラミネート外装体の端部を押し付け板で押し付けている様子を表している。(D)は形成された折り曲げ部が開いてくる様子を表している。It is a figure explaining the conventional bending part forming method. (A) shows a laminated exterior body. (B) shows how the end portion of the laminated exterior body is bent. (C) shows a state in which the end portion of the laminated exterior body is pressed by the pressing plate. (D) shows how the formed bent portion opens.

本願はラミネート加工をした二次電池の外装体において、少なくとも1つの端部に折り曲げ部を有する二次電池の製造方法を開示するものである。以下に、一つの態様である二次電池の製造方法10について説明する。 The present application discloses a method for manufacturing a secondary battery having a bent portion at at least one end in a laminated secondary battery exterior body. Hereinafter, a method 10 for manufacturing a secondary battery, which is one aspect, will be described.

1.二次電池の製造方法10
二次電池の製造方法10(以下、「製造方法10」ということがある。)は、外装体1の端部1bの折り曲げの基点Oに押さえ板2を当接させる工程S1(以下において、「工程S1」ということがある。)と、工程S1後、端部1bを挟むように押さえ板2と押さえ板2に対向する位置に配置されている押し付け板3とを摺動させて、基点Oを中心に端部1bを折り曲げるとともに、押さえ板2と押し付け板3とで端部1bを挟持することにより折り曲げ部1cを形成する工程S2(以下において、「工程S2」ということがある。」)と、を備えている。図1に製造方法10のフローチャートを示した。
1. 1. Secondary battery manufacturing method 10
The secondary battery manufacturing method 10 (hereinafter, may be referred to as “manufacturing method 10”) is a step S1 (hereinafter, referred to as “manufacturing method 10”) in which the pressing plate 2 is brought into contact with the bending base point O of the end portion 1b of the exterior body 1. Step S1 ”) and after step S1, the pressing plate 2 and the pressing plate 3 arranged at positions facing the pressing plate 2 are slid so as to sandwich the end portion 1b, and the base point O Step S2 (hereinafter, may be referred to as "step S2") in which the end portion 1b is bent around the center and the end portion 1b is sandwiched between the pressing plate 2 and the pressing plate 3 to form the bent portion 1c (hereinafter, may be referred to as "step S2"). And have. FIG. 1 shows a flowchart of the manufacturing method 10.

ここで、外装体1の概観図を図2(A)〜(C)に示した。外装体1はアルミニウム等の金属板にラミネート加工を施した薄板から形成されており、図2(A)に示したように、二次電池の構成要素(電極体等)を封入している凸部1aと、周縁部である端部1bとを備えている。また、端部1bの折り曲げの中心となる基点Oを破線で示した。外装体1の端部1bの厚みは、折り曲げを行う観点から0.5mm以下であることが好ましい。図2(B)は図2(A)においてXで示した部分の断面図である。また、図2(C)は、図2(B)において、基点Oを中心に端部1bが折り曲げられ、折り曲げ部1cが形成された外装体1を説明する図である。なお、凸部1aに封入された二次電池の構成要素は図示していない。
以下に、工程S1、S2について説明する。
Here, an overview view of the exterior body 1 is shown in FIGS. 2 (A) to 2 (C). The exterior body 1 is formed of a thin plate obtained by laminating a metal plate such as aluminum, and as shown in FIG. 2A, a convex body containing components (electrode body, etc.) of the secondary battery. A portion 1a and an end portion 1b which is a peripheral edge portion are provided. Further, the base point O which is the center of the bending of the end portion 1b is shown by a broken line. The thickness of the end portion 1b of the exterior body 1 is preferably 0.5 mm or less from the viewpoint of bending. FIG. 2B is a cross-sectional view of the portion indicated by X in FIG. 2A. Further, FIG. 2C is a diagram illustrating the exterior body 1 in which the end portion 1b is bent around the base point O and the bent portion 1c is formed in FIG. 2B. The components of the secondary battery enclosed in the convex portion 1a are not shown.
The steps S1 and S2 will be described below.

1.1.工程S1
工程S1では、外装体1の端部1bの基点Oに押さえ板2を当接させる。基点Oの位置は、二次電池の体積効率(エネルギー効率)を向上させる観点から、適宜設定することができる。
1.1. Process S1
In step S1, the pressing plate 2 is brought into contact with the base point O of the end portion 1b of the exterior body 1. The position of the base point O can be appropriately set from the viewpoint of improving the volumetric efficiency (energy efficiency) of the secondary battery.

図3(A)、(B)に工程S1を説明する図を示した。図3(A)、(B)は外装体1の1つの端部1bを含む部分に注目した断面図であり、図3(A)は基点Oに押さえ板2を当接させる前の様子を表し、図3(B)は基点Oに押さえ板2を当接させた後の様子を表している。 3 (A) and 3 (B) show diagrams for explaining step S1. 3 (A) and 3 (B) are cross-sectional views focusing on a portion of the exterior body 1 including one end 1b, and FIG. 3 (A) shows a state before the pressing plate 2 is brought into contact with the base point O. FIG. 3B shows a state after the pressing plate 2 is brought into contact with the base point O.

図3(A)に示したように、押さえ板2は基点Oに当接する薄い板状の部材であり、紙面奥手前方向に延びる部材である。また、押さえ板2の先端は基点Oに当接し易いように丸みを帯びた形状をしている。押さえ板2は外装体1の端部の上方に配置されており、折り曲げを開始するときに下降し、図3(B)に示したように基点Oに当接する。これにより、工程S2において、基点Oを中心に端部1bの折り曲げを行うことができるため、適切な位置から折り曲げられた折り曲げ部1cを形成することができる。 As shown in FIG. 3A, the pressing plate 2 is a thin plate-shaped member that abuts on the base point O, and is a member that extends toward the back and front of the paper surface. Further, the tip of the pressing plate 2 has a rounded shape so as to easily come into contact with the base point O. The pressing plate 2 is arranged above the end portion of the exterior body 1, lowers when bending is started, and abuts on the base point O as shown in FIG. 3 (B). As a result, in step S2, the end portion 1b can be bent around the base point O, so that the bent portion 1c bent from an appropriate position can be formed.

1.2.工程S2
工程S2は工程S1の後に行われ、端部1bを挟むように押さえ板2と押し付け板3とを摺動させて、基点Oを中心に端部1bを折り曲げるとともに、押さえ板2と押し付け板3とで端部1bを挟持することにより折り曲げ部1cを形成する。
1.2. Process S2
Step S2 is performed after step S1. The pressing plate 2 and the pressing plate 3 are slid so as to sandwich the end portion 1b, the end portion 1b is bent around the base point O, and the pressing plate 2 and the pressing plate 3 are bent. The bent portion 1c is formed by sandwiching the end portion 1b with and.

図4(A)〜(C)に工程S2を説明する図を示した。図4(A)は工程S1を終えた状態を表しており、図3(B)に押し付け板3を追加した図である。図4(B)は押さえ板2と押し付け板3とで端部1bを挟むように摺動させて、基点Oを中心に端部1bを折り曲げる様子を表しており、図4(C)は押さえ板2と押し付け板3とで端部1bを挟持する様子を表している。 FIGS. 4 (A) to 4 (C) show diagrams for explaining step S2. FIG. 4A shows a state in which the step S1 is completed, and is a diagram in which the pressing plate 3 is added to FIG. 3B. FIG. 4B shows a state in which the pressing plate 2 and the pressing plate 3 are slid so as to sandwich the end portion 1b, and the end portion 1b is bent around the base point O, and FIG. 4C shows the pressing plate. It shows a state in which the end portion 1b is sandwiched between the plate 2 and the pressing plate 3.

ここで、押し付け板3の形状について図5(A)、(B)を用いて説明する。図5(A)は押し付け板3の幅方向に直交する断面の図であり、図5(B)は図5(A)の矢印Yの方向から見た押し付け板3の側面図である。 Here, the shape of the pressing plate 3 will be described with reference to FIGS. 5A and 5B. FIG. 5A is a cross-sectional view of the pressing plate 3 orthogonal to the width direction of the pressing plate 3, and FIG. 5B is a side view of the pressing plate 3 seen from the direction of arrow Y in FIG. 5A.

また、押し付け板3の形状を説明するために、本願における方向を説明する。
図4(B)に表れているように、押さえ板2と押し付け板3とは端部1bを挟んで紙面上下方向に摺動する。そこで、本願ではこれらが摺動する方向を摺動方向とする。図5(A)における摺動方向も紙面上下方向である。また、図5(A)、(B)に表れているように、押し付け板3は図5(A)の紙面奥手前方向、図5(B)の左右方向に延びる部材である。よって、本願では押し付け板3の延びる方向を幅方向とする。さらに、図4(C)に表れているように、押し付け板3は外装体1の内部に向かう方向(紙面右方向)に押し付けを行っている。そこで、本願では当該押し付けの方向を押し付け方向という。図5(A)における押し付け方向も紙面右方向である。
Further, in order to explain the shape of the pressing plate 3, the direction in the present application will be described.
As shown in FIG. 4B, the pressing plate 2 and the pressing plate 3 slide in the vertical direction on the paper surface with the end portion 1b interposed therebetween. Therefore, in the present application, the sliding direction is defined as the sliding direction. The sliding direction in FIG. 5A is also the vertical direction of the paper surface. Further, as shown in FIGS. 5 (A) and 5 (B), the pressing plate 3 is a member extending in the front direction of the paper surface in FIG. 5 (A) and in the left-right direction in FIG. 5 (B). Therefore, in the present application, the extending direction of the pressing plate 3 is the width direction. Further, as shown in FIG. 4C, the pressing plate 3 is pressed in the direction toward the inside of the exterior body 1 (to the right of the paper surface). Therefore, in the present application, the pressing direction is referred to as a pressing direction. The pressing direction in FIG. 5A is also the right side of the paper.

押し付け板3は、図5(A)、(B)に示したように、端部1bを挟んで押さえ板2と押し付け板3とを摺動させる際に、端部1bと摺動する面である傾斜面3a及び挟持面3bを有している。傾斜面3aは端部1bの折り曲げを行う役割を有し、挟持面3bは端部1bを挟持する役割を有する。 As shown in FIGS. 5A and 5B, the pressing plate 3 is formed on a surface that slides with the end portion 1b when the pressing plate 2 and the pressing plate 3 are slid with the end portion 1b interposed therebetween. It has a certain inclined surface 3a and a holding surface 3b. The inclined surface 3a has a role of bending the end portion 1b, and the sandwiching surface 3b has a role of sandwiching the end portion 1b.

傾斜面3aは図5(A)、(B)に示したように、2方向に向かう傾斜を有している。1つ目は、図5(A)に示したように、押し付け板3の断面積が摺動方向上側に狭まる傾斜である。2つ目は、図5(B)に示したように、押し付け板3の幅方向に向かう傾斜である。言い換えると、傾斜面3aの上端(摺動方向上側の端部)を含み、かつ、押し付け方向に直交する断面において、押し付け板3の断面積が幅方向下側に狭まる傾斜である。このように傾斜面3aが2方向に向かう傾斜を有するにより、従来では2工程(折り曲げ工程及び押し付け工程)必要であったところ、これらを1つの工程に集約することが可能になる。また、端部1bの折り曲げを確実に行うことができる。これらについて、図4(A)〜(C)に戻って説明する。 As shown in FIGS. 5A and 5B, the inclined surface 3a has an inclination toward two directions. The first is an inclination in which the cross-sectional area of the pressing plate 3 narrows upward in the sliding direction, as shown in FIG. 5 (A). The second is the inclination of the pressing plate 3 in the width direction, as shown in FIG. 5 (B). In other words, in the cross section including the upper end (upper end in the sliding direction) of the inclined surface 3a and orthogonal to the pressing direction, the cross-sectional area of the pressing plate 3 is narrowed downward in the width direction. Since the inclined surface 3a has an inclination in two directions in this way, it is possible to consolidate these into one process, which conventionally required two steps (bending step and pressing step). In addition, the end portion 1b can be reliably bent. These will be described by returning to FIGS. 4A to 4C.

まず、図4(A)に示したように、工程S1が終了した状態において、押し付け板3は押さえ板2に対向する位置に配置されている。このとき押し付け板3は、押さえ板2と押し付け板3とで端部1bを挟持したときに、端部1bに押し付け方向の力が働くように配置する。そして、図4(B)に示したように、押し付け板3を摺動方向上側(紙面上側)に移動させることで、端部1bを挟むように押さえ板2と押し付け板3とを摺動させる。その際、まず端部1bの外側から傾斜面3aに当接し、押し付け板3の上昇に伴って、傾斜面3a全体に端部1bが当接する。これにより、端部1bの折り曲げを滑らかに行うことができる。そして、図4(B)の状態から押し付け板3がさらに上昇すると、端部1bの一部が挟持面3bに当接するようになり、最終的には図4(C)に示したように、押さえ板2と押し付け板3とで端部1bを挟持した状態となる。このとき、端部1bは押し付け板3に押し付け方向(紙面右側)に押し付けられている状態でもあるため、端部1bをしっかりと折り曲げることができる。また、押し付け板3による押し付け方向の力は押さえ板2が受け止めているため、押し付け板の押し付けが外装体1の内部に及ぶことも抑制されている。 First, as shown in FIG. 4A, the pressing plate 3 is arranged at a position facing the pressing plate 2 in the state where the step S1 is completed. At this time, the pressing plate 3 is arranged so that a force in the pressing direction acts on the end portion 1b when the end portion 1b is sandwiched between the pressing plate 2 and the pressing plate 3. Then, as shown in FIG. 4B, by moving the pressing plate 3 to the upper side in the sliding direction (upper side of the paper surface), the pressing plate 2 and the pressing plate 3 are slid so as to sandwich the end portion 1b. .. At that time, first, the end portion 1b comes into contact with the inclined surface 3a from the outside of the end portion 1b, and as the pressing plate 3 rises, the end portion 1b comes into contact with the entire inclined surface 3a. As a result, the end portion 1b can be smoothly bent. Then, when the pressing plate 3 is further raised from the state of FIG. 4 (B), a part of the end portion 1b comes into contact with the holding surface 3b, and finally, as shown in FIG. 4 (C). The end portion 1b is sandwiched between the pressing plate 2 and the pressing plate 3. At this time, since the end portion 1b is also in a state of being pressed against the pressing plate 3 in the pressing direction (right side of the paper surface), the end portion 1b can be bent firmly. Further, since the pressing plate 2 receives the force in the pressing direction by the pressing plate 3, it is also suppressed that the pressing of the pressing plate extends to the inside of the exterior body 1.

さらに、摺動時において、押し付け板3の傾斜面3aが図5(B)に示したように幅方向に傾斜しているため、端部1bを折り曲げる力を1点(幅方向に直交する断面において、傾斜面3a及び挟持面3bが接続されている点)に集中させることができる。よって、端部1bの確実な折り曲げが可能となる。 Further, since the inclined surface 3a of the pressing plate 3 is inclined in the width direction as shown in FIG. 5B during sliding, the force for bending the end portion 1b is applied to one point (cross section orthogonal to the width direction). The point where the inclined surface 3a and the holding surface 3b are connected) can be concentrated. Therefore, the end portion 1b can be reliably bent.

このように、押し付け板3が2つの方向に傾斜している傾斜面3aを有することにより、端部1bの折り曲げを円滑に行い、かつ、折り曲げる力を1点に集中させることができる。また、挟持面3bを有することにより、外装体の内部に向かう方向への押し付けも可能となる。これにより、従来では2工程(折り曲げ工程及び押し付け工程)必要であったところ、これらを1つの工程に集約することが可能になる。また、しっかりと端部1bを折り曲げることができるため、端部1bの加熱を要することなく、形成される折り曲げ部1cの開きを抑制することができる。さらに、押さえ板2と押し付け板3とを組み合わせることで、押し付け方向の力が外装体1の内部に及ぶことを抑制することができる。 By having the pressing plate 3 having the inclined surface 3a inclined in two directions in this way, the end portion 1b can be smoothly bent and the bending force can be concentrated at one point. Further, by having the holding surface 3b, it is possible to press the outer body in the direction toward the inside. This makes it possible to combine two steps (bending step and pressing step) into one step, which was conventionally required. Further, since the end portion 1b can be bent firmly, it is possible to suppress the opening of the bent portion 1c to be formed without requiring heating of the end portion 1b. Further, by combining the pressing plate 2 and the pressing plate 3, it is possible to suppress the force in the pressing direction from reaching the inside of the exterior body 1.

以上、製造方法10によれば、簡易な方法で外装体の内部に封入されている電池要素へのダメージを抑制しつつ、端部に折り曲げ部を有する二次電池を製造することができる。 As described above, according to the manufacturing method 10, it is possible to manufacture a secondary battery having a bent portion at an end while suppressing damage to the battery element enclosed inside the exterior body by a simple method.

ただし、本願が開示する二次電池の製造方法はこれに限定されない。例えば、押し付け板3の2つの傾斜形状は図5(A)、(B)に示したように直線状であるが、これに限定されず、凸R形状、凹R形状、あるいは折れ線形状でもよい。また、工程S1において、押さえ板2を移動させたが、これに限定されず、外装体1を移動させる形態でもよい。同様に工程S2において、押し付け板3を移動させたが、これに限定されず、外装体1及び押さえ板2を移動させる形態としても良い。 However, the method for manufacturing the secondary battery disclosed in the present application is not limited to this. For example, the two inclined shapes of the pressing plate 3 are linear as shown in FIGS. 5A and 5B, but the present invention is not limited to this, and may be a convex R shape, a concave R shape, or a polygonal line shape. .. Further, in step S1, the pressing plate 2 is moved, but the present invention is not limited to this, and the exterior body 1 may be moved. Similarly, in step S2, the pressing plate 3 is moved, but the present invention is not limited to this, and the exterior body 1 and the pressing plate 2 may be moved.

さらに、工程S2の押さえ板2と押し付け板3とで端部1bを挟持した状態(図4(C))において、さらに押し付け方向に力を加える構成としても良い。
例えば、図6(A)に示したように、押し付け板30の上方に押し付けバックアップ4を配置してもよい。図6(A)において、押し付けバックアップ4の形状は押し付け板30と当接する面が傾斜し、押し付け板30の上昇に伴って、押し付け板30が押し付け方向に押し付けられる形態である。これに伴って、押し付け板30の形状も押し付けバックアップ4と当接する部分が傾斜していることが好ましい。ただし、押し付けバックアップの形状はこれに限定されない。押し付けバックアップ4を用いることにより、さらに大きな力で端部1bの押し付けが可能となるため、形成された折り曲げ部1cの開きをさらに抑制することができる。
Further, in a state where the end portion 1b is sandwiched between the pressing plate 2 and the pressing plate 3 in step S2 (FIG. 4C), a force may be further applied in the pressing direction.
For example, as shown in FIG. 6A, the pressing backup 4 may be arranged above the pressing plate 30. In FIG. 6A, the shape of the pressing backup 4 is such that the surface in contact with the pressing plate 30 is inclined, and the pressing plate 30 is pressed in the pressing direction as the pressing plate 30 rises. Along with this, it is preferable that the shape of the pressing plate 30 also has an inclined portion in contact with the pressing backup 4. However, the shape of the pressed backup is not limited to this. By using the pressing backup 4, the end portion 1b can be pressed with a larger force, so that the opening of the formed bent portion 1c can be further suppressed.

また、押し付けバックアップ4を用いる場合、端部1bの折り曲げ角度を鋭角化させることもできる。具体的には、押し付け板を弾性材料から構成することにより折り曲げ角度の鋭角化が可能となる。また、押さえ板2の形状をL字型、テーパ形状、或いは斜め形状としても良い。
図6(B)に斜め形状を有する押さえ板20を用いた例を示した。これにより、押し付け方向の力から逃げるように押さえ板20の形状を設定できるため、折り曲げ角度の鋭角化とともに、押さえ板2の破損も抑制することができる。図6(A)等の押さえ板2は端部1bに対して直立しているため、押し付けバックアップ4を用いると破損する虞がある。なお、図6(B)に示したように、押し付け板31は鋭角化した折り曲げ部の形状に沿う傾斜面31cを有することが好ましい。
さらに、図6(C)に押さえ板20を用い、かつ、弾性を有する押し付け板32を用いた例を示した。
Further, when the pressing backup 4 is used, the bending angle of the end portion 1b can be made acute. Specifically, by forming the pressing plate from an elastic material, it is possible to sharpen the bending angle. Further, the shape of the holding plate 2 may be an L shape, a tapered shape, or an oblique shape.
FIG. 6B shows an example in which the holding plate 20 having an oblique shape is used. As a result, the shape of the pressing plate 20 can be set so as to escape from the force in the pressing direction, so that the bending angle can be sharpened and the pressing plate 2 can be suppressed from being damaged. Since the holding plate 2 shown in FIG. 6A or the like is upright with respect to the end portion 1b, there is a risk of damage when the pressing backup 4 is used. As shown in FIG. 6B, the pressing plate 31 preferably has an inclined surface 31c that follows the shape of the acute-angled bent portion.
Further, FIG. 6C shows an example in which the pressing plate 20 is used and the pressing plate 32 having elasticity is used.

なお、本願において押さえ板、押し付け板、及び押し付けバックアップの材料は特に限定されず、本願の製造方法を行うことができる程度の剛性又は弾性を有すればよい。好ましくは金属製である。 In the present application, the materials for the pressing plate, the pressing plate, and the pressing backup are not particularly limited, and may have enough rigidity or elasticity to carry out the manufacturing method of the present application. It is preferably made of metal.

2.二次電池の製造装置
次に二次電池の製造方法10を行う二次電池の製造装置について説明する。
二次電池の製造装置はラミネート加工が施された外装体において少なくとも1つの端部に折り曲げ部を有する二次電池を製造するための装置であり、具体的には以下の構成を有する。
すなわち、前記二次電池の製造装置は、
前記外装体の前記端部の折り曲げの基点に当接可能な押さえ板と、
前記押さえ板と前記押さえ板に対向する位置に配置されている押し付け板と、を備え、
前記押さえ板と前記押し付け板とは前記端部を挟むように摺動可能であり、
前記押さえ板と前記押し付け板とが摺動することにより、前記基点を中心に前記端部を折り曲げられるとともに、前記押さえ板と前記押し付け板とで前記端部を挟持することにより前記折り曲げ部を形成可能であり、
前記押し付け板の前記端部と摺動する面は、前記端部の折り曲げを行う傾斜面と前記端部を挟持する挟持面とを有し、
前記傾斜面は前記押し付け板の幅方向に直交する断面において、前記押し付け板の断面積が前記摺動方向に狭まるように傾斜しており、
前記傾斜面は前記幅方向に傾斜している。
2. Secondary Battery Manufacturing Device Next, a secondary battery manufacturing device for performing the secondary battery manufacturing method 10 will be described.
The secondary battery manufacturing device is a device for manufacturing a secondary battery having a bent portion at at least one end in a laminated exterior body, and specifically has the following configuration.
That is, the secondary battery manufacturing apparatus is
A holding plate capable of contacting the bending base point of the end portion of the exterior body, and
The holding plate and a pressing plate arranged at a position facing the holding plate are provided.
The pressing plate and the pressing plate are slidable so as to sandwich the end portion.
By sliding the pressing plate and the pressing plate, the end portion can be bent around the base point, and the bent portion is formed by sandwiching the end portion between the pressing plate and the pressing plate. It is possible and
The surface of the pressing plate that slides with the end portion has an inclined surface for bending the end portion and a holding surface for sandwiching the end portion.
The inclined surface is inclined so that the cross-sectional area of the pressing plate is narrowed in the sliding direction in a cross section orthogonal to the width direction of the pressing plate.
The inclined surface is inclined in the width direction.

これにより、従来よりも簡易な方法で外装体の内部に封入されている電池要素へのダメージを抑制しつつ、端部に折り曲げ部を有する二次電池を製造することができる。なお、二次電池の製造装置の詳しい構成、機能等は、上記の二次電池の製造方法10において説明されているため、ここでは省略する。 As a result, it is possible to manufacture a secondary battery having a bent portion at the end while suppressing damage to the battery element enclosed inside the exterior body by a simpler method than before. The detailed configuration, functions, and the like of the secondary battery manufacturing apparatus will be omitted here because they are described in the above secondary battery manufacturing method 10.

1 外装体
2、20 押さえ板
3、30、31、32 押し付け板
3a 傾斜面
3b 挟持面
4 押し付けバックアップ
1 Exterior body 2, 20 Pressing plate 3, 30, 31, 32 Pressing plate 3a Inclined surface 3b Holding surface 4 Pressing backup

Claims (1)

ラミネート加工をした二次電池の外装体において、少なくとも1つの端部に折り曲げ部を有する二次電池の製造方法であって、
前記外装体の前記端部の折り曲げの基点に押さえ板を当接させる工程と、
前記当接させる工程後、前記端部を挟むように前記押さえ板と前記押さえ板に対向する位置に配置されている押し付け板とを摺動させて、前記基点を中心に前記端部を折り曲げるとともに、前記押さえ板と前記押し付け板とで前記端部を挟持することにより前記折り曲げ部を形成する工程と、を備え、
前記押し付け板の前記端部と摺動する面は、前記端部の折り曲げを行う傾斜面と前記端部を挟持する挟持面とを有し、
前記傾斜面は前記押し付け板の幅方向に直交する断面において、前記押し付け板の断面積が前記摺動方向に狭まるように傾斜しており、
前記傾斜面は前記幅方向に傾斜している、
二次電池の製造方法。
A method for manufacturing a secondary battery having a bent portion at at least one end in a laminated secondary battery exterior body.
A step of bringing the pressing plate into contact with the bending base point of the end portion of the exterior body, and
After the abutting step, the pressing plate and the pressing plate arranged at a position facing the pressing plate are slid so as to sandwich the end portion, and the end portion is bent around the base point. A step of forming the bent portion by sandwiching the end portion between the pressing plate and the pressing plate.
The surface of the pressing plate that slides with the end portion has an inclined surface for bending the end portion and a holding surface for sandwiching the end portion.
The inclined surface is inclined so that the cross-sectional area of the pressing plate is narrowed in the sliding direction in a cross section orthogonal to the width direction of the pressing plate.
The inclined surface is inclined in the width direction,
How to manufacture a secondary battery.
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