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JP2009289418A - Manufacturing method of laminated secondary battery - Google Patents

Manufacturing method of laminated secondary battery Download PDF

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Publication number
JP2009289418A
JP2009289418A JP2008137467A JP2008137467A JP2009289418A JP 2009289418 A JP2009289418 A JP 2009289418A JP 2008137467 A JP2008137467 A JP 2008137467A JP 2008137467 A JP2008137467 A JP 2008137467A JP 2009289418 A JP2009289418 A JP 2009289418A
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Prior art keywords
separator
electrode plate
positive electrode
bag
secondary battery
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JP2008137467A
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Tetsuya Sato
哲也 佐藤
Masaharu Yoshinaga
雅治 吉長
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Tokin Corp
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NEC Tokin Corp
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/433—Casing-in, i.e. enclosing an element between two sheets by an outlined seam
    • B29C66/4332—Casing-in, i.e. enclosing an element between two sheets by an outlined seam by folding a sheet over
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • B29C66/81429—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth comprising a single tooth
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3468—Batteries, accumulators or fuel cells
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Secondary Cells (AREA)
  • Cell Separators (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide the manufacturing method of a laminated secondary battery enhancing productivity and capable of reducing the amount of material used. <P>SOLUTION: Positive electrode plates 4 are put on a separator in a state aligned at right angles to the winding-out direction of the separator 1, and then the separator is folded back 180°to seal the positive electrode plates. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は積層型二次電池の製造方法に関し、詳しくはセパレータと正極板および負極板との密着性に優れた積層型二次電池の製造方法に関する。   The present invention relates to a method for manufacturing a stacked secondary battery, and more particularly to a method for manufacturing a stacked secondary battery excellent in adhesion between a separator, a positive electrode plate, and a negative electrode plate.

近年、電気自動車の普及やハイブリット自動車の普及に伴ってリチウムイオン二次電池の高容量化と共に充放電サイクルにおける容量等電気的特性の向上への要求も高まっている。   In recent years, with the popularization of electric vehicles and hybrid vehicles, there has been an increasing demand for improvement in electrical characteristics such as capacity in charge / discharge cycles as well as higher capacity of lithium ion secondary batteries.

リチウムイオン二次電池の中でも積層型リチウムイオン二次電池は、正極および負極の各電極板がそれぞれ引き出し端子に接続されている独特の積層構造を持つことから内部抵抗が低い構造となっており、充放電レート特性が比較的優れていて、充放電サイクル特性や急速充放電特性にも優れたものとして近年注目されている。このような積層型リチウムイオン二次電池は、金属箔などからなる集電体上に活物質層を形成したシート状の正極板と負極板をセパレータを介して積層し、高いバリア性のラミネート外装材で覆ったのち、電解液を注液、封止する構造で構成される。   Among lithium ion secondary batteries, laminated lithium ion secondary batteries have a unique laminated structure in which the positive and negative electrode plates are connected to the lead terminals, respectively, and have a low internal resistance. In recent years, it has attracted attention as having relatively excellent charge / discharge rate characteristics and excellent charge / discharge cycle characteristics and rapid charge / discharge characteristics. Such a laminated type lithium ion secondary battery has a highly barrier laminate exterior in which a sheet-like positive electrode plate and a negative electrode plate having an active material layer formed on a current collector made of metal foil or the like are laminated via a separator. After covering with a material, the electrolyte solution is injected and sealed.

この正極板と負極板はセパレータを介して積層されるが、従来は２枚の同形状のセパレータを重ね合わせて３辺の外周部を熱溶着して袋状に形成させた後、正極板を挿入させる構造で、負極板とその正極板が入った袋状セパレータを交互に重ねて積層を行なっていた(例えば特許文献１〜４参照)。   The positive electrode plate and the negative electrode plate are laminated via a separator. Conventionally, two separators having the same shape are overlapped and the outer peripheral portions of three sides are heat-welded to form a bag shape. In the structure to be inserted, the negative electrode plates and the bag-like separators containing the positive electrode plates are alternately stacked to perform lamination (see, for example, Patent Documents 1 to 4).

図６は従来の積層型二次電池の製造工程を示す図であり、図６（ａ）は袋状セパレータを示す斜視図であり、図６（ｂ）は正極板入り袋状セパレータを示す斜視図である。従来、積層型二次電池の製造においては、図６（ａ）に示すように２枚のセパレータ１を上下重ねて３辺に溶着部１ａを形成して袋状セパレータを作製した後に、図６（ｂ）に示すように、袋状のセパレータ１１に正極板４を挿入し、その後、負極板と交互に積層して積層型二次電池を組み立てていた。   6A and 6B are diagrams showing a manufacturing process of a conventional multilayer secondary battery, FIG. 6A is a perspective view showing a bag-like separator, and FIG. 6B is a perspective view showing a bag-like separator with a positive electrode plate. FIG. Conventionally, in the production of a laminated secondary battery, as shown in FIG. 6A, two separators 1 are stacked one above the other to form a welded portion 1a on three sides, and a bag-like separator is produced. As shown in (b), the positive electrode plate 4 was inserted into the bag-shaped separator 11 and then laminated alternately with the negative electrode plate to assemble a stacked secondary battery.

特開平７−２７２７６１号公報Japanese Patent Laid-Open No. 7-272761 特開平９−１２９２１１号公報JP-A-9-129211 特開２００６−５９７１７号公報JP 2006-59717 A 特開２００８−９１１００号公報JP 2008-91100 A

従来方法で電池を作製する場合、図６に示すように２枚のセパレータを貼り合せた袋状のセパレータに正極板を挿入するが、正極板の端面とセパレータが接触して擦れると正極板に形成されている電極材料の滑落が生じる可能性があった。正極板の電極材料は正極活物質と導電剤に少量のバインダを混合して正極集電体上に塗布したのち、乾燥圧縮したものであるため、正極活物質の活物質同士あるいは正極集電体との結合力はバインダの結合力に依存している。またバインダの混合量は正極の重量に占める割合が重量比で少ないことから正極内での活物質同士の結合力は弱く、わずかな接触等でも活物質が滑落する状態となっている。この滑落した活物質の形状は０．１〜２．０ｍｍ程度の鋭角状の粒子状であり、滑落したあと、電極の上に存在している場合、セパレータを突き破り、正極と負極間が短絡する可能性を有しているため、負極間とのショートの原因となる生産性上の問題点を有していた。   When a battery is manufactured by a conventional method, the positive electrode plate is inserted into a bag-like separator in which two separators are bonded as shown in FIG. 6, but when the end face of the positive electrode plate and the separator are in contact with each other and rubbed, There is a possibility that the formed electrode material slips. The electrode material of the positive electrode plate is obtained by mixing a positive electrode active material and a conductive agent with a small amount of binder, applying the mixture onto the positive electrode current collector, and then drying and compressing the active material of the positive electrode active materials or the positive electrode current collector. The bond strength depends on the binder bond strength. In addition, since the proportion of the binder mixed in the weight of the positive electrode is small in weight ratio, the bonding force between the active materials in the positive electrode is weak, and the active material slides down even with slight contact. The shape of the slid down active material is an acute-angled particle shape of about 0.1 to 2.0 mm, and after slid down, if present on the electrode, it breaks through the separator and shorts between the positive electrode and the negative electrode. Because of this possibility, there was a problem in productivity that caused a short circuit between the negative electrodes.

また、従来方法で積層型電池を作製する場合、セパレータで作製した袋の内側へ正極板を入れた後、積層を行なっていくが、正極板のずれを防ぐために挿入辺側を除いた３辺を熱溶着するため、３辺の熱溶着部分を余分に使用することとなる。また、セパレータで袋を作製してから正極板を挿入するために挿入時の作業性を考慮してセパレータの熱溶着部の位置は正極板寸法よりも幅広とするため、袋状セパレータ内で、正極板の位置のばらつきが生じ、またその挿入代分セパレータの面積が大きくなることから、セパレータの使用量が多くなる問題があった。   In addition, when a stacked battery is manufactured by a conventional method, the positive electrode plate is put inside the bag manufactured by the separator and then stacked. However, in order to prevent displacement of the positive electrode plate, the three sides excluding the insertion side are excluded. In order to heat-weld, three portions of the heat-welded portion are used extra. In addition, in order to insert the positive electrode plate after making the bag with the separator, in consideration of the workability at the time of insertion, the position of the heat welded portion of the separator is wider than the positive electrode plate size, There is a problem that the position of the positive electrode plate varies and the area of the separator increases due to the insertion allowance, which increases the amount of separator used.

本発明の課題は、生産性に優れた、材料の使用量を低減できる積層型二次電池の製造方法を提供することにある。   The subject of this invention is providing the manufacturing method of the laminated type secondary battery which was excellent in productivity and can reduce the usage-amount of material.

上記課題を解決するため本発明の積層型二次電池の製造方法は、平板上にセパレータを配置し、その上にセパレータの巻き出し方向に対して直角に正極板を整列させて載せたあと、セパレータを１８０度折り返して正極板を封止する方法であり、即ち、帯状のセパレータ上に複数の矩形状の正極板を整列して配置する工程と、前記セパレータを、前記正極板を挟み込むように前記正極板の底辺部で折り返す工程と、前記正極板の側辺部に沿って前記セパレータに間欠的に溶着部を形成する工程と、前記溶着部に沿って前記セパレータを切断し正極板入り袋状セパレータを形成する工程と、前記正極板入り袋状セパレータと矩形状の負極板を積層する工程とを含むことを特徴とする。   In order to solve the above problems, the method for manufacturing a laminated secondary battery according to the present invention includes placing a separator on a flat plate and placing a positive electrode plate on the plate so as to be aligned at right angles to the unwinding direction of the separator. In this method, the positive electrode plate is sealed by folding the separator 180 degrees, that is, a step of arranging a plurality of rectangular positive electrode plates on a strip-shaped separator and arranging the positive electrode plate between the separator and the step. A step of folding back at the bottom side of the positive plate, a step of intermittently forming a welded portion on the separator along the side portion of the positive plate, and a bag containing the positive plate by cutting the separator along the welded portion And a step of laminating the bag-shaped separator with a positive electrode plate and a rectangular negative electrode plate.

本発明の積層型二次電池の製造方法によれば電極材料の滑落がなく正極板をセパレータに収納するため生産性がよく、また、挿入代を不要とするためセパレータの使用量を削減できる。   According to the method for manufacturing a laminated secondary battery of the present invention, there is no slipping of the electrode material, and the positive electrode plate is accommodated in the separator, so that the productivity is good.

以下、本発明を実施するための最良の形態について説明する。   Hereinafter, the best mode for carrying out the present invention will be described.

先ず本発明に使用する正極板および負極板について説明する。正極板および負極板の集電体としてはアルミニウム箔、銅箔等の金属箔を用いる。集電体の厚さは５μｍ〜５０μｍ程度である。この集電体は帯状でロール形状に巻き取られている。電極材料の集電体上への形成は活物質、バインダ、導電剤と溶媒を混合してペースト状になったスラリーを集電体表面にコーティング装置にて連続塗布し、その後加熱して溶媒のみを除去し乾燥する。このコーティング装置の選定においては特に限定しないが、集電体が帯状になっているため、ロールコーター、グラビアコーター、カーテンコーター、ダイコーター等、連続塗工できる装置が望ましい。また、電池として活物質からエネルギーを取り出す際に集電体から外部への取り出し用に端子を溶接する必要があるため、未塗布部を形成する。そのため、コーティング装置としては間欠塗工できる装置が望ましい。この活物質の形成は集電体の表裏に対しておこなうため、集電体表面の形成が完了したあとは裏面側にも同様の工事が行なわれる。   First, the positive electrode plate and the negative electrode plate used in the present invention will be described. A metal foil such as an aluminum foil or a copper foil is used as a current collector for the positive electrode plate and the negative electrode plate. The thickness of the current collector is about 5 μm to 50 μm. This current collector is strip-shaped and wound up in a roll shape. The electrode material is formed on the current collector by mixing the active material, binder, conductive agent and solvent into a paste-like slurry on the surface of the current collector using a coating device, and then heating to remove only the solvent. Remove and dry. Although there is no particular limitation on the selection of the coating apparatus, an apparatus capable of continuous coating such as a roll coater, a gravure coater, a curtain coater, and a die coater is desirable because the current collector has a strip shape. Moreover, since it is necessary to weld a terminal for taking out from an electrical power collector when taking out energy from an active material as a battery, an uncoated part is formed. Therefore, an apparatus capable of intermittent coating is desirable as the coating apparatus. Since this active material is formed on the front and back of the current collector, the same construction is performed on the back side after the formation of the current collector surface is completed.

集電体の両面にコーティング装置によって電極材料を塗布した後、形成された電極材料の密度を目的とする膜密度とするためプレス機にて塗布厚の４０％〜９０％までプレスを行ない、電極材料の圧縮を行なう。   After the electrode material is applied to both sides of the current collector by a coating device, the electrode material is pressed to 40% to 90% of the coating thickness with a press machine in order to make the density of the formed electrode material the desired film density. The material is compressed.

電極材料の圧縮後、正極板、負極板共に所定の幅にスリッターにて裁断して巻取りを行なう。スリッターの切断寸法においては正極板よりも負極板の方が切断幅を１〜１０ｍｍ程度大きくすることが望ましい。   After compression of the electrode material, both the positive electrode plate and the negative electrode plate are cut into a predetermined width with a slitter and wound. Regarding the slitting dimensions of the slitter, it is desirable that the negative electrode plate has a cutting width larger by about 1 to 10 mm than the positive electrode plate.

スリッティング加工後、正極板および負極板を所定の寸法にて打ち抜き、矩形状の電極板を作製する。打ち抜きにおいては各電極板を積層する際に、各電極の端子同士を溶接する必要があるため、未塗布部を含めて打ち抜き、未塗布部を端子部として使用するとよい。   After slitting, the positive electrode plate and the negative electrode plate are punched out with predetermined dimensions to produce a rectangular electrode plate. In punching, since it is necessary to weld the terminals of each electrode when laminating each electrode plate, it is preferable to punch out including the uncoated portion and use the uncoated portion as the terminal portion.

次に本発明の実施の形態について図面を参照して説明する。図１は本発明の積層型二次電池の製造方法におけるセパレータ上に正極板を配置する工程を示す斜視図である。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a step of arranging a positive electrode plate on a separator in the method for manufacturing a laminated secondary battery of the present invention.

上述のように電極板に打ち抜いた後、正極板をセパレータの上に載せる。図１に示すようにセパレータは帯状に巻き取られた状態になっており、その巻取りロールからセパレータ１を引き出して、平面の盤上に配置しておく。引き出したセパレータ１の幅方向の寸法は打ち抜いた正極板(端子部となる未塗布部を除く)の２〜２．１倍程度が望ましい。上記平面上に配置されたセパレータ１の上に打ち抜いた正極板４を載せる。この際、正極板を載せる位置はセパレータの端面側にオフセットして載せ、端子部４ａをセパレータからはみ出すように整列させて配置することが望ましい。   After punching into the electrode plate as described above, the positive electrode plate is placed on the separator. As shown in FIG. 1, the separator is in a state of being wound in a strip shape, and the separator 1 is pulled out from the winding roll and placed on a flat board. The dimension in the width direction of the drawn separator 1 is desirably about 2 to 2.1 times that of the punched positive electrode plate (excluding an uncoated portion serving as a terminal portion). The punched positive electrode plate 4 is placed on the separator 1 arranged on the plane. At this time, it is desirable that the position where the positive electrode plate is placed is offset and placed on the end face side of the separator, and the terminal portion 4a is arranged so as to protrude from the separator.

図２は本発明の積層型二次電池の製造方法におけるセパレータを折り返す工程を示す斜視図である。上述のように正極板をセパレータに配置した後、正極板が配置されていない側のセパレータを１８０度折り曲げて正極板を挟むように正極板の上側に覆い被せる。この際、折り曲げ線は正極板の底辺部４ｂ(図１参照)に合わせることが望ましい。   FIG. 2 is a perspective view showing a step of folding back the separator in the method for manufacturing a laminated secondary battery of the present invention. After the positive electrode plate is disposed on the separator as described above, the separator on the side where the positive electrode plate is not disposed is bent 180 degrees and covered on the upper side of the positive electrode plate so as to sandwich the positive electrode plate. At this time, it is desirable that the bend line is aligned with the bottom 4b (see FIG. 1) of the positive electrode plate.

図３は本発明の積層型二次電池の製造方法におけるセパレータに溶着部を形成する工程を示す斜視図である。セパレータを正極板の上に覆いかぶせた後、正極板とセパレータとの間に空隙ができないように密着させた後、正極板の側辺部４ｃ(図１参照)に沿ってヒートシール機２により間欠的に溶着部１ａを形成してセパレータの熱溶着を行なう。このヒートシールによるそれぞれの溶着部の寸法は長さ方向で５ｍｍ、幅方向で１ｍｍ程度が望ましい。   FIG. 3 is a perspective view showing a step of forming a welded portion on the separator in the method for manufacturing a laminated secondary battery of the present invention. After the separator is covered on the positive electrode plate, the separator is brought into close contact with the positive electrode plate and the separator, and then the heat sealer 2 along the side 4c (see FIG. 1) of the positive electrode plate. The welding part 1a is intermittently formed and the separator is thermally welded. The size of each welded part by heat sealing is preferably about 5 mm in the length direction and about 1 mm in the width direction.

図４は本発明の積層型二次電池の製造方法におけるセパレータを切断する工程を示す斜視図である。セパレータの熱溶着を行なった後、正極板の側辺部に沿って形成された溶着部１ａと平行にセパレータをカッター３により切断し、正極板入り袋状セパレータを形成する。   FIG. 4 is a perspective view showing a step of cutting the separator in the method for manufacturing a laminated secondary battery of the present invention. After heat-separating the separator, the separator is cut by the cutter 3 in parallel with the welded portion 1a formed along the side portion of the positive electrode plate to form a bag-shaped separator containing the positive electrode plate.

上述のように作製された正極板入り袋状セパレータと所定の寸法に打ち抜かれた負極板を交互に端子部が対向辺から引き出されるように積層した後、正極板および負極板の端子部をそれぞれ超音波または抵抗、あるいはレーザー溶接等の接続手段で接続させて電池素子とする。その後外装材に電池素子を挿入して注液を行なった後、封止して積層型二次電池とする。なお正極板と負極板の端子部が対向辺から引き出される形態で説明したが、それぞれの端子部となる電極材料未塗布部を電極材料塗布部の半分より狭い幅として、それぞれの端子部を同一辺から引き出すこともできる。   After laminating the positive electrode plate-containing bag-shaped separator and the negative electrode plate punched out to a predetermined size alternately so that the terminal portions are drawn out from the opposite sides, the positive electrode plate and the negative electrode plate terminal portions are respectively The battery element is formed by connection using connection means such as ultrasonic waves, resistance, or laser welding. Thereafter, the battery element is inserted into the exterior material and injected, and then sealed to obtain a laminated secondary battery. In addition, although the terminal part of the positive electrode plate and the negative electrode plate was explained in the form of being drawn out from the opposite side, the electrode material uncoated part that becomes each terminal part was made narrower than half of the electrode material coated part, and each terminal part was the same It can be pulled out from the side.

次に、本発明の実施例について図面を参照して説明する。図５は本発明の積層型二次電池の製造方法における正極板入り袋状セパレータを示す平面図である。   Next, embodiments of the present invention will be described with reference to the drawings. FIG. 5 is a plan view showing a bag-shaped separator with a positive electrode plate in the method for producing a laminated secondary battery of the present invention.

正極板として打ち抜き後の寸法が電極材料塗布部として長さ２１９ｍｍ、幅１０９ｍｍ、厚さ０．３ｍｍ、端子部となる電極材料未塗布部が長さ方向に１５ｍｍ引出されたものを用い、セパレータとしてＰＰ/ＰＥ/ＰＰの三層構造からなる厚さ２０μｍの幅４５０ｍｍのものを用いて、セパレータ上に正極板を１１２ｍｍ間隔で配置したのちセパレータを折り返して、正極板の側辺に沿ってセパレータを片側２箇所、両側で４箇所それぞれ長さ５ｍｍ、幅１ｍｍで溶着したのち切断し、正極板入り袋状セパレータを１００枚作製した。   As a separator, the dimensions after punching out as a positive electrode plate are 219 mm in length, 109 mm in width, 0.3 mm in thickness as the electrode material application part, and 15 mm in the length direction of the electrode material non-application part that becomes the terminal part. Using a PP / PE / PP three-layer structure with a thickness of 20 μm and a width of 450 mm, the positive electrode plates are arranged on the separator at intervals of 112 mm, and then the separator is folded, and the separator is placed along the side of the positive electrode plate. After welding at 2 places on one side and 4 places on both sides with a length of 5 mm and a width of 1 mm, respectively, cutting was performed to produce 100 sheet-like separators with a positive plate.

本実施例の正極板入り袋状セパレータにおいて正極板とセパレータの位置関係について寸法測定した。図５に示すセパレータの溶着部１ａと正極板４との幅方向距離５は０．０〜０．５ｍｍであった。またセパレータの折り返し部と正極板４との長さ方向距離６は０．０〜０．５ｍｍであった。また、袋状セパレータの長さ寸法８は２２５ｍｍ、幅寸法７は１１２ｍｍであった。   The dimensions of the positional relationship between the positive electrode plate and the separator were measured in the bag-shaped separator with the positive electrode plate of this example. The width direction distance 5 between the welded portion 1a of the separator and the positive electrode plate 4 shown in FIG. 5 was 0.0 to 0.5 mm. The distance 6 in the length direction between the folded portion of the separator and the positive electrode plate 4 was 0.0 to 0.5 mm. Moreover, the length dimension 8 of the bag-shaped separator was 225 mm, and the width dimension 7 was 112 mm.

(比較例)
図７は、従来の積層型二次電池の製造方法における正極板入り袋状セパレータを示す平面図である。正極板は実施例と同様のものを用いた。セパレータとしてＰＰ/ＰＥ/ＰＰの三層構造からなる厚さ２０μｍの長さ２３０ｍｍ幅１２０ｍｍのものを用いて、３辺にそれぞれ２箇所、それぞれ長さ５ｍｍ、幅１ｍｍで溶着部１ａを形成し袋状セパレータを作製した。この袋状セパレータに正極板を挿入した正極板入り袋状セパレータにの正極板とセパレータの位置関係について寸法測定した。図７に示すセパレータの溶着部１ａと正極板４との幅方向距離５は２．０〜４．０ｍｍであった。またセパレータの長さ方向の端部と正極板４との長さ方向距離６は３．０〜５．０ｍｍであった。また、袋状セパレータの長さ寸法８は２３０ｍｍ、幅寸法７は１２０ｍｍであった。 (Comparative example)
FIG. 7 is a plan view showing a bag-shaped separator with a positive electrode plate in a conventional method for manufacturing a laminated secondary battery. The positive electrode plate used was the same as in the example. Using a separator with a PP / PE / PP three-layer structure with a thickness of 20 μm, a length of 230 mm, and a width of 120 mm, the welded part 1a is formed on two sides, each with a length of 5 mm and a width of 1 mm. A separator was prepared. The dimensions of the positional relationship between the positive electrode plate and the separator in the bag-shaped separator with the positive electrode plate inserted into the bag-shaped separator were measured. A width direction distance 5 between the welded portion 1a of the separator and the positive electrode plate 4 shown in FIG. 7 was 2.0 to 4.0 mm. Further, the lengthwise distance 6 between the end in the lengthwise direction of the separator and the positive electrode plate 4 was 3.0 to 5.0 mm. Moreover, the length dimension 8 of the bag-shaped separator was 230 mm, and the width dimension 7 was 120 mm.

上記実施例と比較例で作製した正極板入り袋状セパレータにおけるセパレータの使用量について比較してみた。従来の袋状セパレータの寸法は長さ２３０ｍｍ、幅１２０ｍｍであり、その面積は２７６００ｍｍ2となった。本発明で作製した袋状セパレータの寸法は長さ２２５ｍｍ、幅１１２ｍｍでセレータを溶着することが可能となり、その面積は２５２００ｍｍ2となった。即ち本発明によるセパレータの使用量は比較例に対して９１．３％となり、従来の工法に対してセパレータの使用量を８．７％削減することができた。 The amount of separator used in the bag separator with a positive electrode plate produced in the above example and the comparative example was compared. The dimensions of the conventional bag-shaped separator were 230 mm in length and 120 mm in width, and the area was 27600 mm 2 . The size of the bag-shaped separator produced in the present invention was 225 mm in length and 112 mm in width, and it became possible to weld a serator, and the area was 25200 mm 2 . That is, the usage amount of the separator according to the present invention was 91.3% with respect to the comparative example, and the usage amount of the separator was reduced by 8.7% with respect to the conventional method.

また、従来は袋状セパレータ内に含有していた電極滑落物質について外観検査を行なったところ、３〜５％の割合でセパレータ袋内に電極滑落物質があることが判明している。本発明で作製した電池においてセパレータ内に電極滑落物質があるか確認したところ、電極滑落物質がある割合は０％であることが確認された。   Further, when an appearance inspection was performed on the electrode slipping material conventionally contained in the bag-shaped separator, it was found that the electrode slipping material was present in the separator bag at a ratio of 3 to 5%. When it was confirmed whether or not there was an electrode sliding substance in the separator in the battery produced in the present invention, it was confirmed that the ratio of the electrode sliding substance was 0%.

本発明の積層型二次電池の製造方法におけるセパレータ上に正極板を配置する工程を示す斜視図。The perspective view which shows the process of arrange | positioning a positive electrode plate on the separator in the manufacturing method of the laminated type secondary battery of this invention. 本発明の積層型二次電池の製造方法におけるセパレータを折り返す工程を示す斜視図。The perspective view which shows the process of folding back the separator in the manufacturing method of the laminated type secondary battery of this invention. 本発明の積層型二次電池の製造方法におけるセパレータに溶着部を形成する工程を示す斜視図。The perspective view which shows the process of forming a welding part in the separator in the manufacturing method of the laminated type secondary battery of this invention. 本発明の積層型二次電池の製造方法におけるセパレータを切断する工程を示す斜視図。The perspective view which shows the process of cut | disconnecting the separator in the manufacturing method of the laminated type secondary battery of this invention. 本発明の積層型二次電池の製造方法における正極板入り袋状セパレータを示す平面図。The top view which shows the bag-shaped separator with a positive electrode plate in the manufacturing method of the laminated type secondary battery of this invention. 従来の積層型二次電池の製造工程を示す図、図６（ａ）は袋状セパレータを示す斜視図、図６（ｂ）は正極板入り袋状セパレータを示す斜視図。The figure which shows the manufacturing process of the conventional laminated type secondary battery, FIG. 6 (a) is a perspective view which shows a bag-shaped separator, FIG.6 (b) is a perspective view which shows a bag-shaped separator with a positive electrode plate. 従来の積層型二次電池の製造方法における正極板入り袋状セパレータを示す平面図。The top view which shows the bag-shaped separator with a positive electrode plate in the manufacturing method of the conventional multilayer secondary battery.

符号の説明Explanation of symbols

１ セパレータ
１ａ 溶着部
２ ヒートシール機
３ カッター
４ 正極板
４ａ 端子部
４ｂ 底辺部
４ｃ 側辺部
５ 幅方向距離
６ 長さ方向距離
７ 幅寸法
８ 長さ寸法
９ 電極滑落物質 DESCRIPTION OF SYMBOLS 1 Separator 1a Welding part 2 Heat seal machine 3 Cutter 4 Positive electrode plate 4a Terminal part 4b Bottom part 4c Side part 5 Width direction distance 6 Length direction distance 7 Width dimension 8 Length dimension 9 Electrode sliding substance

Claims (1)

帯状のセパレータ上に複数の矩形状の正極板を整列して配置する工程と、前記セパレータを、前記正極板を挟み込むように前記正極板の底辺部で折り返す工程と、前記正極板の側辺部に沿って前記セパレータに間欠的に溶着部を形成する工程と、前記溶着部に沿って前記セパレータを切断し正極板入り袋状セパレータを形成する工程と、前記正極板入り袋状セパレータと矩形状の負極板を積層する工程とを含むことを特徴とする積層型二次電池の製造方法。   Arranging a plurality of rectangular positive plates on a strip-shaped separator in an aligned manner, a step of folding the separator at the bottom of the positive plate so as to sandwich the positive plate, and a side of the positive plate A step of intermittently forming a welded portion on the separator along the step, a step of cutting the separator along the welded portion to form a bag-like separator with a positive electrode plate, a bag-like separator with a positive electrode plate and a rectangular shape And a step of laminating the negative electrode plate. A method for producing a laminated secondary battery, comprising:
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