JP6035796B2 - Manufacturing method of battery outer can and manufacturing method of secondary battery - Google Patents

Manufacturing method of battery outer can and manufacturing method of secondary battery Download PDF

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JP6035796B2
JP6035796B2 JP2012059251A JP2012059251A JP6035796B2 JP 6035796 B2 JP6035796 B2 JP 6035796B2 JP 2012059251 A JP2012059251 A JP 2012059251A JP 2012059251 A JP2012059251 A JP 2012059251A JP 6035796 B2 JP6035796 B2 JP 6035796B2
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manufacturing
rectangular
battery
sealing lid
secondary battery
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JP2013196777A (en
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和彦 塚田
和彦 塚田
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Toyo Seikan Kaisha Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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Description

本発明は、外装缶の製造方法、及び二次電池の製造方法、特に角形二次電池に用いられる外装缶の製造方法、及び角形二次電池の製造方法に関する。   The present invention relates to a method for manufacturing an outer can, and a method for manufacturing a secondary battery, in particular, a method for manufacturing an outer can used for a prismatic secondary battery, and a method for manufacturing a prismatic secondary battery.

近年、太陽光発電などの蓄電システムや電気自動車に向けた二次電池（蓄電池）が、需要の高まりを受けて普及している。これらの二次電池は、各システムや製品への適用性、収容性の観点から角形形状が採用されることが多い（以下、角形電池）。この角形電池は、例えば、金属製の外装缶と封口蓋で構成され、外装缶の開口部に封口蓋をレーザ溶着して密閉する構造が採用されている。   2. Description of the Related Art In recent years, secondary batteries (storage batteries) for power storage systems such as solar power generation and electric vehicles have become widespread in response to increasing demand. In these secondary batteries, a rectangular shape is often adopted from the viewpoint of applicability to each system or product and storage capacity (hereinafter referred to as a rectangular battery). This prismatic battery is composed of, for example, a metal outer can and a sealing lid, and employs a structure in which a sealing lid is laser-welded to an opening of the outer can and sealed.

そして、金属製の外装缶と封口蓋で構成される角形電池において、溶接時に封口蓋を位置決めする方法として、外装缶の開口部内周面に封口蓋の端部を載置する段差部を設ける方法が提案されている。例えば、特許文献１には、絞り加工により、開口端の隅部に段差部を付与した角形電池用外装缶が開示され、また、特許文献２には、深絞り加工により成形した開口端を拡口した金属角形容器を、しごきダイスに取り付けてしごきポンチでしごき加工を行って段部を形成した密閉型角形電池容器及びその製造方法が開示されている。さらに、特許文献３には、蓋の外装容器内への落下を防止するため、突き出し加工やエンボス加工によって容器内側に位置決め用の突起を形成した角形外装容器及びその製造方法が開示されている。   And in the rectangular battery composed of a metal outer can and a sealing lid, as a method of positioning the sealing lid at the time of welding, a method of providing a stepped portion for placing the end of the sealing lid on the inner peripheral surface of the opening of the outer can Has been proposed. For example, Patent Document 1 discloses a rectangular battery outer can in which a step portion is provided at the corner of the opening end by drawing, and Patent Document 2 expands the opening end formed by deep drawing. A closed prismatic battery container in which a mouthed metal square container is attached to an ironing die and subjected to ironing with an ironing punch to form a stepped portion, and a method for manufacturing the same are disclosed. Furthermore, Patent Document 3 discloses a rectangular outer container in which positioning protrusions are formed on the inner side of the container by extrusion or embossing in order to prevent the lid from falling into the outer container, and a manufacturing method thereof.

特開平９−２６５９６６号公報JP-A-9-265966 特開平９−２９３４８７号公報JP-A-9-293487 特開平１１−２１９６８８号公報Japanese Patent Laid-Open No. 11-219688

しかしながら、外装缶の開口部内周面に封口蓋の端部を載置する段差部を設ける方法において、特許文献１は、ポンチの隅部の形状を出っ張り形状として絞り成形を行い、外装缶の開口部に段差部を形成するものであり、一方、特許文献２は、深絞り加工により成形した開口端を拡口した金属角形容器を、しごきダイスに取り付けてしごきポンチでしごき加工を行って段部を形成するものである。このため、段差部、或いは段部において厚みが変化するため、段差部が基点となり成形中に亀裂、破断等が発生（破胴）し易く、生産性が低下する。   However, in the method of providing a stepped portion for placing the end portion of the sealing lid on the inner peripheral surface of the opening of the outer can, Patent Document 1 performs drawing with the shape of the corner of the punch as a protruding shape, and the opening of the outer can On the other hand, in Patent Document 2, a metal rectangular container with an open end formed by deep drawing is attached to an ironing die and subjected to ironing with an ironing punch to form a stepped part. Is formed. For this reason, since the thickness changes at the stepped portion or at the stepped portion, the stepped portion serves as a base point, and cracks, breaks, etc. are likely to occur (cylinder) during molding, and productivity is lowered.

また、特許文献３の突き出し加工等によって突起を内側に突出させる方法は、位置決め用の突起が収容スペースへ突出するため、収容スペースが減少する恐れがある。   Further, in the method of projecting the protrusions inward by the protrusion processing or the like of Patent Document 3, the positioning space protrudes into the storage space, so that the storage space may be reduced.

従って、本発明の目的は、封口蓋を載置する段差部を備えた外装缶の製造において、前記段差部の成形時の亀裂を防止すると共に生産性の向上を図り、また、収納スペースの減少を防止することができる外装缶の製造方法、及び該外装缶を用いた二次電池の製造方法を提供することである。   Accordingly, an object of the present invention is to prevent cracking at the time of molding of the stepped portion and improve productivity and reduce storage space in the manufacture of an outer can having a stepped portion on which a sealing lid is placed. It is providing the manufacturing method of the armored can which can prevent, and the manufacturing method of the secondary battery using this armored can.

前記目的を達成するために本発明の電池の外装缶の製造方法は、角形筒状部と底部から成り、前記角形筒状部の開口部内周に封口蓋を載置する段差部を備えた、電池の外装缶の製造方法において、前記角形筒状部の対向する上方外周面に、高さ方向に間隙を有する第一成形具をそれぞれ当接し、第二成形具を前記角形筒状部の上方内周面から第一成形具に押し込んで外方に突出する突出部を形成し、次いで、ケース内周面及び外周面に段差部として残存するように前記突出部のトリミングを行い、前記段差部を前記角形筒状部の開口部に形成することを特徴とする。
In order to achieve the above object, a method for manufacturing an outer can of a battery according to the present invention comprises a rectangular cylindrical portion and a bottom portion, and includes a stepped portion for placing a sealing lid on the inner periphery of the opening of the rectangular cylindrical portion . In the method for manufacturing the outer can of the battery, the first molding tool having a gap in the height direction is brought into contact with the upper outer peripheral surface facing the rectangular cylindrical part, and the second molding tool is placed above the rectangular cylindrical part. The protrusion is pushed from the inner peripheral surface into the first molding tool to protrude outward, and then the protrusion is trimmed so as to remain as a step portion on the inner peripheral surface and the outer peripheral surface of the case, and the step portion Is formed in the opening of the rectangular cylindrical portion.

本発明の電池の外装缶の製造方法は、次のように構成することもできる。
１．前記第一成形具の間隙によって前記突出部の高さ方向の長さを制御する。
２．前記角形筒状部の断面形状が矩形であって、前記段差部を開口部の対向する短辺領域にそれぞれ成形する。
３．前記突出部を形成する前の外装缶を、絞り、或いは絞り−しごき加工によって成形する。 The manufacturing method of the battery can of the present invention can also be configured as follows.
1. The length of the protrusion in the height direction is controlled by the gap between the first forming tools.
2. A cross-sectional shape of the rectangular cylindrical portion is rectangular, and the stepped portion is formed in a short side region facing the opening.
3. The outer can before forming the protruding portion is formed by drawing or drawing-ironing.

また、前記目的を達成するために本発明に係る二次電池の製造方法は、前記外装缶の製造方法によって得られた外装缶の段差部に、封口蓋を載置すると共に、前記封口蓋の外周端部及び外装缶の角形筒状部の上端周囲部をレーザ溶着することを特徴とする。   In order to achieve the above object, a method for manufacturing a secondary battery according to the present invention includes a sealing lid placed on a step portion of an outer can obtained by the outer can manufacturing method, Laser welding is performed on the outer peripheral end portion and the upper peripheral portion of the rectangular tubular portion of the outer can.

本発明の外装缶の製造方法によれば、外装缶の角形筒状部の厚みを維持して段差部を形成するため、段差部の成形において亀裂、破断等を有効に防止することができる。
また、段差部が外方に突出して形成されるため、外装缶の収容スペースの減少が防止される。 According to the method for manufacturing an outer can of the present invention, the stepped portion is formed while maintaining the thickness of the rectangular cylindrical portion of the outer can, and therefore cracks, breaks, and the like can be effectively prevented in forming the stepped portion.
In addition, since the stepped portion is formed to protrude outward, a reduction in the space for housing the outer can is prevented.

また、本発明の外装缶の製造方法によれば、第一成形具の間隙によって突出部の高さ方向の長さを制御することにより、段差部として残存させる突出部を所望の形状に容易に成形することができる。   In addition, according to the method for manufacturing an outer can of the present invention, by controlling the length in the height direction of the protruding portion by the gap of the first forming tool, the protruding portion remaining as a stepped portion can be easily formed into a desired shape. Can be molded.

また、本発明の外装缶の製造方法によれば、角形筒状部の断面形状が矩形の場合において、段差部を形成する箇所を開口部の対向する短辺領域とすることで、段差部の成形が容易であり、成形精度も向上するため、寸法が安定した正確な封口蓋の位置決め形状を付与することができる。また、突出部の形成箇所を短辺領域とし外形形状の変形量を少なくすることで、各システムや製品への適用性、収容性への影響を低減することができる。   Further, according to the manufacturing method of the outer can of the present invention, when the square cylindrical portion has a rectangular cross-sectional shape, the portion where the step portion is formed is the short-side region opposed to the opening portion. Since molding is easy and molding accuracy is improved, an accurate sealing lid positioning shape with stable dimensions can be provided. In addition, by forming the projecting portion at the short side region and reducing the amount of deformation of the outer shape, it is possible to reduce the applicability to each system and product and the effect on accommodation.

さらに、突出部の形成を絞り、或いは絞り−しごき加工とは別の工程で行うことにより、絞り、或いは絞り−しごき加工では発生しやすい前記突出部の亀裂、破断による生産ラインの停止が無くなるため、生産性の向上を図ることができる。   Furthermore, the formation of the protruding portion is performed in a process different from the drawing or drawing-ironing process, so that the production line is not stopped due to the crack or breakage of the protruding portion, which is likely to occur in the drawing or drawing-ironing process. , Productivity can be improved.

また、本発明の角形二次電池の製造方法によれば、外方に突出した段差部に封口蓋を載置してレーザ溶着を行うため、段差部における亀裂、破断、及び収容スペースの減少が防止された角形二次電池を得ることができ、さらに、上方から容易にレーザ溶着を行うことが可能となる。   In addition, according to the method for manufacturing a rectangular secondary battery of the present invention, since the sealing lid is placed on the stepped portion protruding outward and laser welding is performed, cracks, breakage, and reduction of the accommodation space in the stepped portion are reduced. A prevented prismatic secondary battery can be obtained, and laser welding can be easily performed from above.

本発明の製造方法によって得られた外装缶を用いた角形二次電池の模式図Schematic diagram of a prismatic secondary battery using an outer can obtained by the manufacturing method of the present invention 本発明の外装缶、角形二次電池の製造方法の模式図Schematic diagram of manufacturing method of outer can and prismatic secondary battery of the present invention 本発明の外装缶の製造方法に於ける突出部形成工程、トリミング工程の模式拡大図Schematic enlarged view of protruding portion forming step and trimming step in the manufacturing method of the outer can of the present invention 本発明の角形二次電池の製造方法におけるレーザ溶着工程の模式図Schematic diagram of laser welding process in manufacturing method of prismatic secondary battery of the present invention

以下に図面を参照して、本発明を実施するための実施形態を説明する。尚、本実施形態における構成の材質、形状それらの相対配置などは、適宜変更が可能であり、本発明の範囲を以下の本実施形態に限定するものではない。   Embodiments for carrying out the present invention will be described below with reference to the drawings. In addition, the material of the structure in this embodiment, a shape, those relative arrangement | positioning, etc. can be changed suitably, and the range of this invention is not limited to the following this embodiment.

（実施形態）
図１〜図４を参照して、本発明の外装缶、角形二次電池の製造方法の実施形態について説明する。 (Embodiment)
With reference to FIGS. 1-4, embodiment of the manufacturing method of the armored can and the square secondary battery of this invention is described.

＜角形二次電池の概略構成＞
図１は、本発明の製造方法によって得られた外装缶を用いた角形二次電池の模式図であって、角形二次電池１は、開口部２２を有する外装缶２と、該開口部２２を閉塞するための封口蓋３と、から構成される。 <Schematic configuration of prismatic secondary battery>
FIG. 1 is a schematic diagram of a rectangular secondary battery using an outer can obtained by the manufacturing method of the present invention. The square secondary battery 1 includes an outer can 2 having an opening 22 and the opening 22. And a sealing lid 3 for closing.

角形二次電池１を構成する外装缶２と封口蓋３は、例えば、アルミニウム合金等の金属板から成り、内部には電池を構成する種々の発電要素（例えば、電極やセパレータなど）が収納される。尚、金属板は、特に限定されるものではなく、例えばＳＰＣＥ（冷間圧延鋼板）やＳＵＳ（ステンレス鋼）、鉄ニッケル鋼板等の他の金属材料でもよい。   The outer can 2 and the sealing lid 3 constituting the rectangular secondary battery 1 are made of, for example, a metal plate such as an aluminum alloy, and various power generation elements (for example, electrodes, separators, etc.) constituting the battery are accommodated therein. The In addition, a metal plate is not specifically limited, For example, other metal materials, such as SPCE (cold rolled steel plate), SUS (stainless steel), an iron nickel steel plate, may be sufficient.

外装缶２は、角形筒状部２０と底部２１が一体に成形された有底筒状の構造を有している。角形筒状部２０の開口部２２の内周端には、封口蓋３の端部を載置するための段差部２３が設けられている。段差部２３は、略矩形の開口部２２の互いに対向する短辺領域に、それぞれに外方に突出するように形成されている。そして、外装缶２の開口部２２が封口蓋３によって閉塞されることにより角形二次電池１が形成される。   The outer can 2 has a bottomed cylindrical structure in which a rectangular cylindrical portion 20 and a bottom portion 21 are integrally formed. A step portion 23 for placing the end portion of the sealing lid 3 is provided at the inner peripheral end of the opening portion 22 of the rectangular tubular portion 20. The step portions 23 are formed in the short side regions of the substantially rectangular opening 22 facing each other so as to protrude outward. The rectangular secondary battery 1 is formed by closing the opening 22 of the outer can 2 with the sealing lid 3.

尚、本実施形態では、角形二次電池１（外装缶２）が、各面が長辺と短辺を有する長方形で構成された略直方体形状に構成されているが、例えば、各面が正方形で構成された略直方体形状であってもよい。   In the present embodiment, the prismatic secondary battery 1 (exterior can 2) is configured in a substantially rectangular parallelepiped shape in which each surface is formed of a rectangle having a long side and a short side. For example, each surface is a square. The substantially rectangular parallelepiped shape comprised by these may be sufficient.

＜外装缶、角形二次電池の製造方法＞
図２〜図４を参照して、本実施形態に係る外装缶２、角形二次電池１の製造方法について説明する。本製造方法は、概略、（１）金属板の絞り、或いは絞り−しごき工程（図示せず）、（２）突出部形成工程、（３）トリミング工程、（４）レーザ溶着工程から構成される。本発明における外装缶２の製造方法は、主として、（２）突出部形成工程と（３）トリミング工程により構成される。 <Manufacturing method of outer can and prismatic secondary battery>
With reference to FIGS. 2-4, the manufacturing method of the armored can 2 and the square secondary battery 1 which concern on this embodiment is demonstrated. This manufacturing method is roughly composed of (1) metal plate drawing or drawing-ironing process (not shown), (2) projecting portion forming process, (3) trimming process, and (4) laser welding process. . The manufacturing method of the outer can 2 according to the present invention mainly includes (2) a protruding portion forming step and (3) a trimming step.

（１）金属成形体製造工程
本工程は、図示しないが、従来公知の絞り、或いは絞り−しごき加工により、金属板材から底部２０１と該底部２０１から筒状に延びる断面形状が矩形の角形筒状部２０２とを備えた有底筒状の金属成形体を作成する。そして、この時点では、後述する段差部として残存させる突出部を角形筒状部２０２に成形する必要がなく、従来の絞り、或いは絞り−しごき加工に賦して容易に成形することができる。 (1) Metal molded body manufacturing process This process is not shown in the figure, but a rectangular cylinder having a rectangular cross section extending from the metal plate to the bottom 201 and from the bottom 201 by a conventionally known drawing or drawing-ironing process. A bottomed cylindrical metal molded body having a portion 202 is created. At this time, there is no need to form a protrusion that remains as a stepped portion, which will be described later, into the rectangular tubular portion 202, and it can be easily formed by applying to a conventional drawing or drawing-ironing process.

（２）突出部形成工程
本工程は、図２（Ａ）、（Ｂ）、図３（Ａ）、（Ｂ）に示す突出部形成装置４００を用いて行う。そして、図２（Ａ）、図３（Ａ）は、第二成形具を第一成形具に押し込む前（突出部形成前）、図２（Ｂ）、図３（Ｂ）は、第二成形具を第一成形具に押し込んだ後（突出部形成後）のそれぞれの状態を示す。 (2) Protrusion part formation process This process is performed using the protrusion part formation apparatus 400 shown to FIG. 2 (A), (B), FIG. 3 (A), (B). 2 (A) and 3 (A) show the second molding before pushing the second molding tool into the first molding tool (before the protrusion is formed), and FIG. 2 (B) and FIG. 3 (B) show the second molding. The respective states after the tool is pushed into the first forming tool (after the protrusion is formed) are shown.

突出部形成装置４００は、第一成形具のダイ４０１と、第二成形具のパンチ４０２と、を備え、パンチ４０２は後端に傾斜面を有しており、該傾斜面と摺動する傾斜面を有する
押出具４０３の上下動により、水平方向に押されて移動する構成となっている。 The protrusion forming device 400 includes a die 401 of a first forming tool and a punch 402 of a second forming tool. The punch 402 has an inclined surface at the rear end, and is inclined to slide with the inclined surface. The pusher 403 having a surface is moved in the horizontal direction by moving up and down.

図２（Ａ）、図３（Ａ）に示すように、金属成形体２００の角形筒状部２０２の短辺領域の外周面にダイ４０１を当接させ、内周面にパンチ４０２を当接させる。ダイ４０１は、底部２０１から所定の高さ位置で角形筒状部２０２の外周面に当接させる。各ダイ４０１は、一対の当接部を有するように構成されており、第１当接部４０１ａと第２当接部４０１ｂが、高さ方向（上下方向）に所定の間隙を空けて配置される。パンチ４０２は、第１当接部４０１ａと第２当接部４０１ｂの間の所定の高さに配置される。   2A and 3A, the die 401 is brought into contact with the outer peripheral surface of the short side region of the rectangular cylindrical portion 202 of the metal molded body 200, and the punch 402 is brought into contact with the inner peripheral surface. Let The die 401 is brought into contact with the outer peripheral surface of the rectangular tubular portion 202 at a predetermined height position from the bottom portion 201. Each die 401 is configured to have a pair of contact portions, and the first contact portion 401a and the second contact portion 401b are arranged with a predetermined gap in the height direction (vertical direction). The The punch 402 is disposed at a predetermined height between the first contact portion 401a and the second contact portion 401b.

そして、図２（Ｂ）、図３（Ｂ）に示すように、押出具４０３が下降することにより、両側のパンチ４０２が、それぞれ外側に向かって移動すると共に、第１当接部４０１ａと第２当接部４０１ｂの間隙に入り込むように移動する。これにより、金属成形体２００の角形筒状部２０２の一部が第１当接部４０１ａと第２当接部４０１ｂの間に押し込まれ角形筒状部２０２の所定の高さ位置に外方に突出する突出部２０４が形成される。
このように、段差部として残存させる角形筒状部２０２の突出部２０４は、ダイ４０１の間隙によって突出部の高さ方向の間隙を制御することにより容易に成形される。 Then, as shown in FIGS. 2B and 3B, when the pusher 403 is lowered, the punches 402 on both sides move outward, and the first contact portion 401a and the first 2 Move so as to enter the gap between the contact portions 401b. As a result, a part of the rectangular tubular portion 202 of the metal molded body 200 is pushed between the first contact portion 401a and the second contact portion 401b and outwards to a predetermined height position of the rectangular tubular portion 202. A protruding portion 204 that protrudes is formed.
As described above, the protruding portion 204 of the rectangular tubular portion 202 that remains as the stepped portion is easily formed by controlling the gap in the height direction of the protruding portion by the gap of the die 401.

ダイ４０１の第１当接部４０１ａと第２当接部４０１ｂの間隔ａ（図３（Ａ）参照）、パンチ４０２の押し込み量（移動量）は、突出部形成時の角形筒状部２０２における突出部２０４に亀裂が発生しない範囲（例えば、側壁厚みに対し５０乃至３００％）で適宜設定される。尚、本実施例では側壁厚みが０．６ｍｍであり、突出部２０４の突出高さは０．５ｍｍである。また、パンチ４０２の押し込み量は、摺動面の傾斜角度や押出具４０３の移動量を調整することで容易に調整することができる。   The distance a (see FIG. 3A) between the first contact portion 401a and the second contact portion 401b of the die 401 and the pushing amount (movement amount) of the punch 402 are the same as those in the rectangular cylindrical portion 202 when the protrusion is formed. The protrusion 204 is appropriately set within a range in which no crack is generated (for example, 50 to 300% with respect to the side wall thickness). In this embodiment, the side wall thickness is 0.6 mm, and the protruding height of the protruding portion 204 is 0.5 mm. Further, the pushing amount of the punch 402 can be easily adjusted by adjusting the inclination angle of the sliding surface and the moving amount of the pusher 403.

（３）トリミング工程
本工程は、図２（Ｃ）、図３（Ｃ）、（Ｄ）に示すように、前述した突出部形成工程により形成した角形筒状部２０２の突出部２０４のトリミングを行い、外装缶２の角形筒状部２０における開口部２２及び段差部２３を形成する。本工程により、図３（Ｄ）に示すように金属成形体２００から外装缶２が形成される。 (3) Trimming Step In this step, as shown in FIGS. 2C, 3C, and 3D, trimming of the protruding portion 204 of the rectangular cylindrical portion 202 formed by the above-described protruding portion forming step is performed. It performs and forms the opening part 22 and the level | step-difference part 23 in the square cylindrical part 20 of the exterior can 2. FIG. By this step, the outer can 2 is formed from the metal molded body 200 as shown in FIG.

本工程においては、金属成形体２００の角形筒状部２０２を、例えば、トリミングカッターによって切断し、外装缶２の角形筒状部２０として残す部分２０２ａと、トリミングにより取り除かれる不要部分２０２ｂとに分離され、角形筒状部２０２を分離する高さは、段差部２３における封口蓋３端面との接合面の所望の高さを考慮して設定される。具体的な高さは、例えば、封口蓋３の厚み（端面の幅）に応じて適宜設定される。   In this step, the rectangular cylindrical portion 202 of the metal molded body 200 is separated into, for example, a portion 202a that is left as the rectangular cylindrical portion 20 of the outer can 2 by cutting with a trimming cutter and an unnecessary portion 202b that is removed by trimming. The height at which the rectangular cylindrical portion 202 is separated is set in consideration of the desired height of the joint surface between the stepped portion 23 and the end surface of the sealing lid 3. The specific height is appropriately set according to the thickness (end face width) of the sealing lid 3, for example.

（４）レーザ溶着工程
本工程は、図２（Ｄ）、図４に示すように、前述したトリミング工程によって成形された外装缶２の内部に所定の収容物を収納後、封口蓋３を外装缶２の開口部２２に嵌入し、レーザ溶着によって、封口蓋３の外周端部と外装缶２の角形筒状部２０の上端周囲部とを溶着する。これにより、外装缶２に封口蓋３が溶着され、角形二次電池１が完成する。 (4) Laser welding process In this process, as shown in FIGS. 2 (D) and 4, after a predetermined container is stored in the exterior can 2 formed by the trimming process described above, the sealing lid 3 is exteriorized. It fits in the opening part 22 of the can 2, and the outer peripheral edge part of the sealing lid 3 and the upper end periphery part of the square cylindrical part 20 of the exterior can 2 are welded by laser welding. Thereby, the sealing lid 3 is welded to the outer can 2, and the rectangular secondary battery 1 is completed.

尚、本発明の実施形態において、段差部２３を設ける箇所は、角形筒状部の開口部２２の短辺領域全域に限定されず、封口蓋３の溶着の際に封口蓋３を支えることができる構成であれば良く、例えば、短辺領域に部分的に段差部２３を形成する構成でも良い。また、長辺領域全域、或いは部分的に形成する構成でも良い。   In the embodiment of the present invention, the place where the stepped portion 23 is provided is not limited to the entire short side region of the opening 22 of the rectangular tubular portion, and the sealing lid 3 is supported when the sealing lid 3 is welded. For example, a configuration in which the stepped portion 23 is partially formed in the short side region may be used. Moreover, the structure formed in the whole long side area | region or may be sufficient.

１ 角形二次電池
２ 外装缶
２０ 角形筒状部
２１ 底部
２２ 開口部
２３ 段差部
３ 封口蓋 DESCRIPTION OF SYMBOLS 1 Square secondary battery 2 Exterior can 20 Square cylindrical part 21 Bottom part 22 Opening part 23 Step part 3 Sealing lid

Claims (5)

角形筒状部と底部から成り、前記角形筒状部の開口部内周に封口蓋を載置する段差部を備えた、電池の外装缶の製造方法において、
前記角形筒状部の対向する上方外周面に、高さ方向に間隙を有する第一成形具をそれぞれ当接し、第二成形具を前記角形筒状部の上方内周面から第一成形具に押し込んで外方に突出する突出部を形成し、次いで、ケース内周面及び外周面に段差部として残存するように前記突出部のトリミングを行い、前記段差部を前記角形筒状部の開口部に形成することを特徴とする電池の外装缶の製造方法。 In a method for manufacturing an outer can of a battery, comprising a stepped portion comprising a rectangular tubular portion and a bottom portion, and placing a sealing lid on the inner periphery of the opening of the rectangular tubular portion,
A first molding tool having a gap in the height direction is brought into contact with the opposing upper outer peripheral surface of the rectangular cylindrical portion, and the second molding tool is moved from the upper inner peripheral surface of the rectangular cylindrical portion to the first molding tool. The protrusion is pushed out to form an outward protrusion, and then the protrusion is trimmed so as to remain as a stepped portion on the inner and outer peripheral surfaces of the case, and the stepped portion is opened to the rectangular cylindrical portion. A method for producing an outer can of a battery, comprising: 前記第一成形具の間隙によって前記突出部の高さ方向の長さを制御することを特徴とする請求項１に記載の電池の外装缶の製造方法。   The method for manufacturing a battery outer can according to claim 1, wherein the length of the protruding portion in the height direction is controlled by the gap between the first forming tools. 前記角形筒状部の断面形状が矩形であって、前記段差部を開口部の対向する短辺領域にそれぞれ成形することを特徴とする請求項１又は２に記載の電池の外装缶の製造方法。   3. The method for manufacturing an outer can of a battery according to claim 1, wherein the rectangular cylindrical portion has a rectangular cross-sectional shape, and the stepped portion is formed in a short-side region facing the opening, respectively. . 前記突出部を形成する前の外装缶を、絞り、或いは絞り−しごき加工によって成形することを特徴とする請求項１乃至３のいずれか１項に記載の電池の外装缶の製造方法。   The method for manufacturing an outer can of a battery according to any one of claims 1 to 3, wherein the outer can before forming the protruding portion is formed by drawing or drawing-ironing. 前記請求項１乃至４のいずれか１項に記載の電池の外装缶の製造方法によって得られた外装缶の段差部に、封口蓋を載置すると共に、前記封口蓋の外周端部及び外装缶の角形筒状部の上端周囲部をレーザ溶着することを特徴とする角形二次電池の製造方法。 A sealing lid is placed on a step portion of the outer can obtained by the method for manufacturing an outer can of a battery according to any one of claims 1 to 4, and an outer peripheral end of the sealing lid and the outer can A method for manufacturing a rectangular secondary battery, comprising laser welding the upper peripheral portion of the rectangular cylindrical portion.
JP2012059251A 2012-03-15 2012-03-15 Manufacturing method of battery outer can and manufacturing method of secondary battery Expired - Fee Related JP6035796B2 (en)

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