JP4781070B2 - Sealed battery and manufacturing method thereof - Google Patents

Sealed battery and manufacturing method thereof Download PDF

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JP4781070B2
JP4781070B2 JP2005282619A JP2005282619A JP4781070B2 JP 4781070 B2 JP4781070 B2 JP 4781070B2 JP 2005282619 A JP2005282619 A JP 2005282619A JP 2005282619 A JP2005282619 A JP 2005282619A JP 4781070 B2 JP4781070 B2 JP 4781070B2
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tab
current collecting
film
electrode
positive
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慎也 北濱
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Sanyo Electric Co Ltd
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    • Y02P70/50Manufacturing or production processes characterised by the final manufactured product

Description

本発明は電池ケースとしてラミネートフィルム等のフィルム状外装体を用いた電池に関する。   The present invention relates to a battery using a film-shaped outer package such as a laminate film as a battery case.

携帯電話やPDAなどのモバイル型電子機器への小型化の要求に伴い、その電源に用いられる電池には、より一層の薄型化および軽量化が要求されている。   With the demand for miniaturization of mobile electronic devices such as mobile phones and PDAs, batteries used for the power supply are required to be further thinner and lighter.

この要求に応えるべく、アルミニウム等の金属層と樹脂層とが積層されたラミネートフィルムを用いてなるフィルム状外装体を電池ケースとした軽量薄型電池が開発されている。このラミネートフィルムは、例えば、図5に示すように、金属層と樹脂層とが積層された構造であり、例えば図6に示すように、方形状のラミネートフィルムを筒状に成型し、フィルムの重なり合い部分(4d)及び上下端部(4e・4f)を熱圧着等により封止している。   In order to meet this demand, a lightweight and thin battery using a film-like outer package made of a laminate film in which a metal layer such as aluminum and a resin layer are laminated has been developed. For example, as shown in FIG. 5, this laminate film has a structure in which a metal layer and a resin layer are laminated. For example, as shown in FIG. 6, a rectangular laminate film is formed into a cylindrical shape, The overlapping portion (4d) and the upper and lower end portions (4e, 4f) are sealed by thermocompression bonding or the like.

この構成の電池では、タブ7・8が突出した封止部4eにおいて、ラミネートフィルムの内面の樹脂層と集電タブとが接着される構造であるが、樹脂層と金属との接着力が乏しいため、封止部4eの密着性が不十分となり、この部分から水分等が電池内部に侵入して、電池性能を劣化させるという問題がある。   In the battery of this configuration, the sealing layer 4e from which the tabs 7 and 8 protrude has a structure in which the resin layer on the inner surface of the laminate film and the current collecting tab are bonded, but the adhesive force between the resin layer and the metal is poor. For this reason, the adhesion of the sealing portion 4e becomes insufficient, and there is a problem that moisture or the like enters the inside of the battery from this portion and deteriorates the battery performance.

この問題を解決するため、特許文献1は、集電タブ7と外装体内面の樹脂層102との間に熱融着性の変性樹脂層5を介在させて封口する技術を提案している(図8(a)参照。)。   In order to solve this problem, Patent Document 1 proposes a technique of sealing by interposing a heat-sealable modified resin layer 5 between the current collecting tab 7 and the resin layer 102 on the inner surface of the exterior body ( (See FIG. 8 (a)).

特開平10-289696号公報Japanese Patent Laid-Open No. 10-289696

上記技術によると、熱融着性の変性樹脂層5が集電タブ7及び外装体内面の樹脂層102と十分に接着するので、集電タブが突出した封止部4eの封口性能を飛躍的に高めることができるとされる。   According to the above technique, since the heat-sealable modified resin layer 5 is sufficiently bonded to the current collecting tab 7 and the resin layer 102 on the inner surface of the exterior body, the sealing performance of the sealing portion 4e from which the current collecting tab protrudes is dramatically improved. It is said that it can be increased.

しかし、上記技術では、集電タブを折り曲げた際に、図8(b)に示すように、集電タブ7とラミネートフィルム端面に露出した金属層100とが接触し、極性を帯びた金属層100が腐食して封止性能を低下させるという問題があった。この問題を解決するため、図7及び図8(c)に示すように、外装体端部から突出した状態で絶縁性のタブフィルム(変性樹脂層)5を熱溶着し、集電タブ7と金属層100との接触を防止する技術が提案されている(図8(d)参照。)。
図7及び図8(d)に示すように、この絶縁性タブフィルムは、集電タブ5・6を折り曲げた場合においても、集電タブとラミネートフィルム端面の金属層100との接触を確実に防止するため、外装体端部からある程度突出させている(図7のLで示す長さ)。
However, in the above technique, when the current collecting tab is bent, as shown in FIG. 8 (b), the current collecting tab 7 and the metal layer 100 exposed on the end face of the laminate film are in contact with each other, and the metal layer having polarity is obtained. There was a problem that 100 corroded and the sealing performance deteriorated. In order to solve this problem, as shown in FIG. 7 and FIG. 8C, an insulating tab film (modified resin layer) 5 is heat-welded in a state of protruding from the end of the exterior body, A technique for preventing contact with the metal layer 100 has been proposed (see FIG. 8D).
As shown in FIGS. 7 and 8D, this insulating tab film ensures contact between the current collecting tab and the metal layer 100 on the end face of the laminated film even when the current collecting tabs 5 and 6 are bent. In order to prevent this, it protrudes to some extent from the end of the exterior body (the length indicated by L in FIG. 7).

ところで、絶縁性タブフィルム5・6が取り付けられた部分や、タブ突出封止部4aの厚みは、電極体が収納された部分の厚みよりも薄いため、このスペースを有効活用するために、保護回路等が配置される。この保護回路に電源を供給するためには、集電タブ7・8を折り曲げて、絶縁性フィルム5・6が取り付けられていない集電タブ本体7・8に、保護回路の配線や端子を接続する。しかし、タブフィルム突出長さLが過大であると、タブフィルムの弾性によって集電タブを折り曲げにくくなる(実質的に、タブフィルムが取り付けられていない部分からしか折り曲げることができなくなる)とともに、保護回路の配線や端子を集電タブ本体に取り付けることが難しくなり、保護回路等を組み込んだ電池パッケージとなす際の設計が難しくなる。しかしながら、現在の製造方法では突出長さLのバラツキが大きく、突出長さLを制御することが困難であるという課題を有していた。   By the way, the thickness of the portion where the insulating tab films 5 and 6 are attached and the thickness of the tab protruding sealing portion 4a is thinner than the thickness of the portion where the electrode body is housed. A circuit or the like is arranged. In order to supply power to the protection circuit, the current collecting tabs 7 and 8 are bent and the wiring and terminals of the protection circuit are connected to the current collecting tab bodies 7 and 8 to which the insulating films 5 and 6 are not attached. To do. However, if the tab film protrusion length L is excessive, the current collecting tab is difficult to bend due to the elasticity of the tab film (substantially it can be bent only from the portion where the tab film is not attached) and protection is provided. It becomes difficult to attach circuit wiring and terminals to the current collecting tab body, and it becomes difficult to design a battery package incorporating a protection circuit or the like. However, the current manufacturing method has a problem that the variation in the projecting length L is large, and it is difficult to control the projecting length L.

本発明は上記課題を解決するものであり、タブフィルムの突出長さを制御し得たフィルム状外装体を用いた電池を提供することを目的とする。   This invention solves the said subject, and it aims at providing the battery using the film-shaped exterior body which could control the protrusion length of a tab film.

上記課題を解決するための電池に係る本発明は、集電タブ本体に絶縁性タブフィルムが付された正極集電タブを備える正極と、集電タブ本体に絶縁性タブフィルムが付された負極集電タブを備える負極と、を有する電極体と、金属層と樹脂層とが積層されたラミネートフィルムからなり、その内部に前記電極体が収納された外装体であって、前記正負集電タブの先端側が外部に突出された状態で熱融着されたタブ突出封止部を有する外装体と、を備える封口電池において、前記正負集電タブが、少なくとも前記タブ突出封止部において集電タブ本体とタブフィルムとが接着され、前記タブ突出封止部近傍よりも先端側においては集電タブ本体とタブフィルムとが接着されていないことを特徴とする。   The present invention relating to a battery for solving the above problems includes a positive electrode including a positive electrode current collecting tab having an insulating tab film attached to the current collecting tab body, and a negative electrode having an insulating tab film attached to the current collecting tab body. A negative electrode having a current collecting tab, an electrode body having a laminate film in which a metal layer and a resin layer are laminated, and an electrode body in which the electrode body is housed, wherein the positive and negative current collecting tabs A sealing battery having a tab projecting sealing portion that is heat-sealed in a state in which the front end side of the current projecting portion protrudes to the outside, wherein the positive and negative current collecting tabs are at least the current collecting tabs in the tab projecting sealing portion. The main body and the tab film are bonded to each other, and the current collecting tab main body and the tab film are not bonded to each other on the tip side from the vicinity of the tab protruding sealing portion.

上記本発明を、図面を用いて説明する。図3に示すように、集電タブ7・8には、それぞれタブフィルム5・6が取り付けられており、このタブフィルム5・6は、タブ突出封止部4a側は集電タブ本体とタブフィルムとが接着され(5a・6a)、タブ突出封止部近傍よりも先端側においては集電タブ本体とタブフィルムとが接着されていない(5b・6b)。この構成の電池では、熱溶着されていない部分5b・6bを封止部4a側に折り返したり、切り取ったりすることにより、集電タブ7・8の折り曲げや、保護回路の配線・端子の取り付けが容易となる。   The present invention will be described with reference to the drawings. As shown in FIG. 3, tab films 5 and 6 are attached to the current collecting tabs 7 and 8, respectively. The tab films 5 and 6 are arranged on the tab protruding sealing portion 4a side and the current collecting tab body and the tab. The film is adhered (5a, 6a), and the current collector tab body and the tab film are not adhered on the tip side from the vicinity of the tab protruding sealing portion (5b, 6b). In the battery having this configuration, the current collecting tabs 7 and 8 can be folded and the wiring and terminals of the protective circuit can be attached by folding or cutting the portions 5b and 6b that are not heat-welded to the sealing portion 4a side. It becomes easy.

なお、図4(a)に示すように、タブフィルム5全体が熱溶着されていると、余剰なタブフィルム5を折り返したり、切断して取り除いたりすることができない。他方、初めからタブフィルム5の長さを短くしておくと、製造時のタブフィルムの突出長さLのバラツキが大きいため、突出長さLが必要最低限未満となって、集電タブとラミネートフィルムの金属層との絶縁性を確保できなくなるおそれがある。   In addition, as shown to Fig.4 (a), when the tab film 5 whole is heat-welded, the excess tab film 5 cannot be return | folded or cut and removed. On the other hand, if the length of the tab film 5 is shortened from the beginning, the variation in the protruding length L of the tab film at the time of manufacture is large. There is a risk that insulation with the metal layer of the laminate film cannot be secured.

また、上記課題を解決するための電池の製造方法に係る本発明は、集電タブ本体に絶縁性タブフィルムが付された正極集電タブを備える正極と、集電タブ本体に絶縁性タブフィルムが付された負極集電タブを備える負極と、を有する電極体と、金属層と樹脂層とが積層されたラミネートフィルムからなり、その内部に前記電極体が収納された外装体であって、前記正負集電タブの先端側が外部に突出された状態で熱融着されたタブ突出封止部を有する外装体と、を備える封口電池の製造方法において、前記製造方法は、前記タブ突出封止部に位置させる予定部位における集電タブ本体とタブフィルムとが接着され、前記予定部位とその近傍を除く先端側部分における集電タブ本体とタブフィルムが接着されていない構造の集電タブを、正負電極にそれぞれ取り付ける集電タブ取り付け工程と、前記正負集電タブが取り付けられた正負電極を用いて前記電極体を作製する電極体作製工程と、前記電極体形成工程の後、前記正負集電タブを外装体外に突出させた状態で、前記電極体を前記外装体内に収納し、しかる後に正負集電タブが突出した外装体開口部分を加熱溶着し封止してなるタブ突出封止部を形成するタブ突出部形成工程と、前記タブ突出部形成工程の後、外装体の端部から突出した部位であって集電タブ本体と接着されていない部位においてタブフィルムのみを切断し除去するタブフィルム切断除去工程とを備えることを特徴とする。   In addition, the present invention relating to a battery manufacturing method for solving the above-described problems includes a positive electrode including a positive electrode current collecting tab in which an insulating tab film is attached to the current collecting tab body, and an insulating tab film on the current collecting tab body. A negative electrode including a negative electrode current collector tab with a mark, and a laminate film in which a metal layer and a resin layer are laminated, and an exterior body in which the electrode body is housed, And an exterior body having a tab protruding sealing portion that is heat-sealed in a state in which the leading end side of the positive and negative current collecting tabs protrudes to the outside, and the manufacturing method includes the tab protruding sealing The current collecting tab main body and the tab film at the planned site to be positioned in the part are bonded, and the current collecting tab main body and the tab film at the tip side portion excluding the predetermined site and the vicinity thereof are not bonded. Positive and negative Current collector tab attaching step to be attached to each of the electrodes, an electrode body producing step of producing the electrode body using positive and negative electrodes to which the positive and negative current collector tabs are attached, and the positive and negative current collecting tabs after the electrode body forming step. The electrode body is accommodated in the exterior body in a state of projecting out of the exterior body, and then a tab projecting sealing portion is formed by heat welding and sealing the exterior body opening portion from which the positive and negative current collecting tabs project. Tab projection cutting step that cuts and removes only the tab film at a portion that protrudes from the end of the exterior body and is not bonded to the current collector tab body after the tab protrusion formation step and the tab protrusion formation step. And a removing step.

上記製造方法によると、図1に示すように、タブフィルム突出長さLを、切断除去工程によって必要最低限に制御できる。よって、集電タブ7・8の折り曲げや、保護回路の配線・端子の取り付けが容易な封口電池を提供できる。   According to the said manufacturing method, as shown in FIG. 1, the tab film protrusion length L can be controlled to the minimum necessary by a cutting removal process. Therefore, it is possible to provide a sealed battery in which the current collecting tabs 7 and 8 can be bent and the wiring and terminals of the protection circuit can be easily attached.

ここで、タブフィルム切断除去工程は、タブフィルムが集電タブと接着されている部分と、接着されていない部分の境界部分を切断除去するものを意味するのではなく、タブフィルム突出長さLが十分に集電タブと金属層との接触を防止できる長さに切断することを意味し、切断除去後のタブフィルムに接着されていない部分が残っていてもよい。   Here, the tab film cutting and removing step does not mean that the tab film is cut and removed at the boundary portion between the portion where the tab film is bonded to the current collecting tab and the portion where the tab film is not bonded. Means cutting to a length that can sufficiently prevent contact between the current collecting tab and the metal layer, and a portion that is not adhered to the tab film after cutting and removal may remain.

上記製造方法においては、金属とタブフィルムとの密着性を高めるために、タブフィルムを熱融着により接着することが好ましい。   In the said manufacturing method, in order to improve the adhesiveness of a metal and a tab film, it is preferable to adhere | attach a tab film by heat sealing | fusion.

上記本発明によると、タブフィルムの突出長さを必要最低限に設定できるため、集電タブとラミネートフィルムの金属層との接触を確実に防止でき、且つ集電タブ7・8の折り曲げや、保護回路の配線・端子の取り付けが容易な封口電池を実現できる。   According to the present invention, since the protruding length of the tab film can be set to the minimum necessary, contact between the current collecting tab and the metal layer of the laminate film can be reliably prevented, and the current collecting tabs 7 and 8 can be bent, It is possible to realize a sealed battery in which the wiring and terminals of the protection circuit can be easily attached.

(実施の形態)
以下に、本発明電池をリチウムイオン二次電池に適用した場合について、図面を用いながら説明する。
図3に示すように、本発明に係るリチウムイオン二次電池は、フィルム状外装体の一例であるアルミニウムラミネート材を用いたアルミニウムラミネート外装体3を有している。そして、集電タブ7・8には、絶縁性タブフィルム5・6が取り付けられており、絶縁性タブフィルムのタブ突出封止部4a側は集電タブ本体とタブフィルムとが接着され(5a・6a)、タブ突出封止部近傍よりも先端側においては集電タブ本体とタブフィルムとが接着されていない(5b・6b)。
(Embodiment)
The case where the battery of the present invention is applied to a lithium ion secondary battery will be described below with reference to the drawings.
As shown in FIG. 3, the lithium ion secondary battery according to the present invention has an aluminum laminate outer package 3 using an aluminum laminate material which is an example of a film-shaped outer package. Insulating tab films 5 and 6 are attached to the current collecting tabs 7 and 8, and the current collecting tab main body and the tab film are bonded to the tab protruding sealing portion 4a side of the insulating tab film (5a 6a) The current collector tab body and the tab film are not bonded to each other on the tip side of the vicinity of the tab protruding sealing portion (5b, 6b).

図1に、本発明の他の形態を示す。この形態は、上記図3に示す本発明に係るリチウムイオン二次電池の集電タブ本体とタブフィルムとが接着されていない部分5b・6bを切断除去したものである。   FIG. 1 shows another embodiment of the present invention. In this embodiment, the portions 5b and 6b where the current collector tab body and the tab film of the lithium ion secondary battery according to the present invention shown in FIG. 3 are not bonded are cut and removed.

このアルミニウムラミネート外装体3は、図1・図3に示すように、フィルムが折り返されてなる底部を有し、前記底部以外の扁平形状の3方が封止された3方封止構造である。そして、前記底部と3方の封止部4a・4b・4cで囲まれた本体部分の内側に収納空間2が形成されており(図2参照)、この収納空間2内に、扁平電極体1と、非水電解液が収納されている。   As shown in FIGS. 1 and 3, the aluminum laminate outer package 3 has a bottom portion formed by folding a film, and has a three-side sealing structure in which three flat shapes other than the bottom portion are sealed. . A storage space 2 is formed inside the main body surrounded by the bottom and the three sealing portions 4a, 4b, and 4c (see FIG. 2), and the flat electrode body 1 is formed in the storage space 2. And a non-aqueous electrolyte is stored.

次に、外装体3の構成材であるアルミニウムラミネート材について説明する。アルミニウムラミネート材は、図5の断面図に示すように、アルミニウムから成る厚さ35μmの金属層100の一方の面に、厚さ15μmのナイロン層101(電池外方に存在する層)が配され、この金属層100の他方の面に厚さ25μmのポリプロピレン層102(電池内方に存在する層)が配された構造をしている。そして、金属層100とナイロン層101とは、厚さ5μmのドライラミネート接着剤層103により接着され、他方、金属層100とポリプロピレン層102とは、ポリプロピレンにカルボキシル基が付加された厚さ5μmのカルボン酸変性ポリプロピレン層104によって接着された構造である。
なお、本発明の適用はこの構造のアルミニウムラミネート材を用いた外装体に限定されるものではないことは勿論である。
Next, an aluminum laminate material that is a constituent material of the exterior body 3 will be described. As shown in the cross-sectional view of FIG. 5, the aluminum laminate material has a 15 μm thick nylon layer 101 (a layer present outside the battery) disposed on one surface of a 35 μm thick metal layer 100 made of aluminum. The metal layer 100 has a structure in which a polypropylene layer 102 (a layer existing inside the battery) having a thickness of 25 μm is disposed on the other surface of the metal layer 100. The metal layer 100 and the nylon layer 101 are bonded by a dry laminate adhesive layer 103 having a thickness of 5 μm, while the metal layer 100 and the polypropylene layer 102 have a thickness of 5 μm in which a carboxyl group is added to polypropylene. The structure is bonded by the carboxylic acid-modified polypropylene layer 104.
Needless to say, the application of the present invention is not limited to the exterior body using the aluminum laminate material having this structure.

上記構造のリチウムイオン二次電池の作製方法について説明する。   A method for manufacturing the lithium ion secondary battery having the above structure will be described.

<正極の作製>
コバルト酸リチウム(LiCoO2)からなる正極活物質と、アセチレンブラックまたはグラファイト等の炭素系導電剤と、ポリビニリデンフルオライド(PVDF)からなる結着剤とを、質量比90:5:5の割合で量り採り、これらをN−メチル−2−ピロリドンからなる有機溶剤等に溶解させた後、混合し、正極活物質スラリーを調製した。
<Preparation of positive electrode>
A ratio of 90: 5: 5 mass ratio of a positive electrode active material made of lithium cobaltate (LiCoO 2 ), a carbon-based conductive agent such as acetylene black or graphite, and a binder made of polyvinylidene fluoride (PVDF). The sample was dissolved in an organic solvent composed of N-methyl-2-pyrrolidone and then mixed to prepare a positive electrode active material slurry.

次に、ダイコーターまたはドクターブレード等を用いて、幅(芯体の短手方向の長さ)が59mm、長さ(芯体の長手方向の長さ)が725mmのアルミニウム箔からなる正極芯体の両面に、この正極活物質スラリーを均一な厚みで塗布した。ただし、正極芯体の端部にはスラリーを塗布せず、その芯体を露出させた。   Next, using a die coater or a doctor blade, a positive electrode core made of an aluminum foil having a width (length in the short direction of the core) of 59 mm and a length (length in the longitudinal direction of the core) of 725 mm The positive electrode active material slurry was applied to both surfaces of the substrate with a uniform thickness. However, the slurry was not applied to the end portion of the positive electrode core body, and the core body was exposed.

この極板を乾燥機内に通して上記有機溶剤を除去し、塗布質量が450g/m2の乾燥極板を作製した。この乾燥極板を、ロールプレス機を用いて、その厚みが0.16mmとなるように圧延した。この後、前記芯体露出部に集電タブを取り付け、このタブのタブ突出封止部4aとなる位置及びその周縁に渡って、ポリプロピレン(PP)製のタブフィルムを取り付けた。なお、タブフィルムの取り付けは、図4(b)に示すように、電池内方側(図面下側)を正極集電タブ7に熱溶着し(5a)、正極集電タブ7の先端側(図面上側)は熱溶着しなかった(5b)。 This electrode plate was passed through a dryer to remove the organic solvent, and a dry electrode plate with a coating mass of 450 g / m 2 was produced. This dry electrode plate was rolled using a roll press so that its thickness was 0.16 mm. Thereafter, a current collecting tab was attached to the exposed core portion, and a tab film made of polypropylene (PP) was attached over the tab projection sealing portion 4a and the periphery thereof. As shown in FIG. 4B, the tab film is attached by thermally welding the inner side of the battery (the lower side of the drawing) to the positive electrode current collecting tab 7 (5a). The upper side of the drawing) was not thermally welded (5b).

本実施の形態にかかるリチウムイオン二次電池で用いる正極活物質としては、上記コバルト酸リチウム以外にも、例えばニッケル酸リチウム(LiNiO2)、マンガン酸リチウム(LiMn24)、鉄酸リチウム(LiFeO2)、またはこれらの酸化物に含まれる遷移金属の一部を他の元素で置換した酸化物等のリチウム含有遷移金属複合酸化物を単独で、あるいは二種以上を混合して用いることができる。 As the positive electrode active material used in the lithium ion secondary battery according to the present embodiment, for example, lithium nickelate (LiNiO 2 ), lithium manganate (LiMn 2 O 4 ), lithium ferrate ( LiFeO 2 ) or a lithium-containing transition metal composite oxide such as an oxide obtained by substituting a part of the transition metal contained in these oxides with other elements may be used alone or in combination of two or more. it can.

<負極の作製>
体積平均粒径20μmの人造黒鉛からなる負極活物質と、スチレンブタジエンゴムからなる結着剤と、カルボキシメチルセルロースからなる増粘剤とを、質量比98:1:1の割合で量り採り、これらを適量の水と混合し、負極活物質スラリーを調製した。
<Production of negative electrode>
A negative electrode active material made of artificial graphite having a volume average particle diameter of 20 μm, a binder made of styrene butadiene rubber, and a thickener made of carboxymethyl cellulose were weighed in a mass ratio of 98: 1: 1, and these were measured. A negative electrode active material slurry was prepared by mixing with an appropriate amount of water.

次に、ダイコーターまたはドクターブレード等を用いて、幅(芯体の短手方向の長さ)が61mm、長さ(芯体の長手方向の長さ)が715mmの銅箔からなる負極芯体の両面に、この負極活物質スラリーを均一な厚さで塗布した。ただし、負極芯体の端部にはスラリーを塗布せず、その芯体を露出させた。   Next, using a die coater or a doctor blade, a negative electrode core made of a copper foil having a width (length in the short direction of the core) of 61 mm and a length (length in the longitudinal direction of the core) of 715 mm The negative electrode active material slurry was applied to both surfaces of the substrate with a uniform thickness. However, the slurry was not applied to the end of the negative electrode core, and the core was exposed.

この極板を乾燥機内に通して水分を除去し、塗布質量が200g/m2の乾燥極板を作製した。その後、この乾燥極板を、ロールプレス機によりその厚みが0.14mmとなるように圧延した。この後、上記正極と同様にして、負極集電タブ8に、タブフィルム6を溶着部6aと、未溶着部6bとを有するように取り付けた。 The electrode plate was passed through a dryer to remove moisture, and a dry electrode plate having a coating mass of 200 g / m 2 was produced. Then, this dry electrode plate was rolled with a roll press so that the thickness became 0.14 mm. Thereafter, in the same manner as the positive electrode, the tab film 6 was attached to the negative electrode current collecting tab 8 so as to have a welded portion 6a and an unwelded portion 6b.

ここで、本実施の形態にかかるリチウムイオン二次電池で用いる負極材料としては、例えば天然黒鉛、カーボンブラック、コークス、ガラス状炭素、炭素繊維、あるいはこれらの焼成体等の炭素質物、または前記炭素質物と、リチウム、リチウム合金、およびリチウムを吸蔵・放出できる金属酸化物からなる群から選ばれる1種以上との混合物を用いることができる。   Here, as a negative electrode material used in the lithium ion secondary battery according to the present embodiment, for example, natural graphite, carbon black, coke, glassy carbon, carbon fiber, or a carbonaceous material such as a fired body thereof, or the carbon A mixture of the material and one or more selected from the group consisting of lithium, a lithium alloy, and a metal oxide capable of occluding and releasing lithium can be used.

<電極体の作製>
上記正極と負極とオレフィン系樹脂からなる微多孔膜のセパレータとを、巻き取り機により捲回し、絶縁性の巻き止めテープを設け、扁平電極体1を完成させた。なお、タブ保護テープやセパレータの材質は上記材質に特に限定されるものではない。
<Production of electrode body>
The positive electrode, the negative electrode, and a microporous membrane separator made of an olefin resin were wound by a winder, and an insulating anti-winding tape was provided to complete the flat electrode body 1. The material for the tab protection tape and the separator is not particularly limited to the above materials.

<電解液の作製>
エチレンカーボネート(EC)とプロピレンカーボネート(PC)とジエチルカーボネート(DEC)とを体積比1:1:8の割合(1気圧、25℃と換算した場合における)で混合した非水溶媒に、電解質塩としてのLiPF6を1.0M(モル/リットル)の割合で溶解したものを電解液とした。
<Preparation of electrolyte>
An electrolyte salt is added to a nonaqueous solvent in which ethylene carbonate (EC), propylene carbonate (PC), and diethyl carbonate (DEC) are mixed at a volume ratio of 1: 1: 8 (when converted to 1 atm and 25 ° C.). As an electrolytic solution, LiPF 6 as a solution was dissolved at a rate of 1.0 M (mol / liter).

ここで、本実施の形態にかかるリチウムイオン二次電池で用いる非水溶媒としては、上記の組み合わせに限定されるものではなく、例えばエチレンカーボネート、プロピレンカーボネート、ブチレンカーボネート、γ−ブチロラクトン等のリチウム塩の溶解度が高い高誘電率溶媒と、ジエチルカーボネート、ジメチルカーボネート、エチルメチルカーボネート、1,2−ジメトキシエタン、テトラヒドロフラン、アニソール、1,4−ジオキサン、4−メチル−2−ペンタノン、シクロヘキサノン、アセトニトリル、プロピオニトリル、ジメチルホルムアミド、スルホラン、蟻酸メチル、蟻酸エチル、酢酸メチル、酢酸エチル、酢酸プロピル、プロピオン酸エチル等の低粘性溶媒とを混合させて用いることができる。さらに、前記高誘電率溶媒や低粘性溶媒をそれぞれ二種以上の混合溶媒とすることもできる。また、電解質塩としては、上記LiPF6以外にも、例えばLiN(C25SO22、LiN(CF3SO22、LiClO4またはLiBF4等を単独で、あるいは2種以上混合して用いることができる。 Here, the non-aqueous solvent used in the lithium ion secondary battery according to the present embodiment is not limited to the above combinations, and for example, lithium salts such as ethylene carbonate, propylene carbonate, butylene carbonate, and γ-butyrolactone. A high-dielectric-constant solvent with high solubility of diethyl carbonate, dimethyl carbonate, ethyl methyl carbonate, 1,2-dimethoxyethane, tetrahydrofuran, anisole, 1,4-dioxane, 4-methyl-2-pentanone, cyclohexanone, acetonitrile, pro It can be used by mixing with a low viscosity solvent such as pionitrile, dimethylformamide, sulfolane, methyl formate, ethyl formate, methyl acetate, ethyl acetate, propyl acetate, ethyl propionate. Furthermore, the high dielectric constant solvent and the low viscosity solvent can be used as a mixed solvent of two or more. In addition to the LiPF 6 described above, for example, LiN (C 2 F 5 SO 2 ) 2 , LiN (CF 3 SO 2 ) 2 , LiClO 4, or LiBF 4 may be used alone or in combination of two or more. Can be used.

<電池の作製>
上記扁平電極体1と上記電解液とを、フィルムが折り返されてなる底部を有し、かつ前記底部以外の扁平形状の3方が封止された3方封止構造のアルミニウムラミネート外装体3の収納空間2内に挿入し、この外装体の開口部を封止して、図3に示す本発明電池を組み立てた。この後、タブフィルム5・6の未溶着部分5b・6bを、突出長さLが1.0mmとなるように切断除去して、図1に示す本実施の形態にかかるリチウムイオン二次電池を完成させた。
<Production of battery>
An aluminum laminate outer package 3 having a three-sided sealing structure in which the flat electrode body 1 and the electrolyte solution have a bottom portion formed by folding a film and three flat shapes other than the bottom portion are sealed. The battery of the present invention shown in FIG. 3 was assembled by inserting into the storage space 2 and sealing the opening of the outer package. Thereafter, the unwelded portions 5b and 6b of the tab films 5 and 6 are cut and removed so that the projecting length L becomes 1.0 mm, and the lithium ion secondary battery according to the present embodiment shown in FIG. Completed.

(実施例1)
本実施例は、上記実施の形態と同様にして作製した。
Example 1
This example was manufactured in the same manner as the above embodiment.

(比較例1)
タブフィルム全体を熱溶着し、電池組み立て後、タブフィルムの切断を行わなかったこと以外は、上記実施の形態と同様にして、図7に示す比較例1に係る電池を作製した。
(Comparative Example 1)
A battery according to Comparative Example 1 shown in FIG. 7 was produced in the same manner as in the above embodiment except that the entire tab film was thermally welded and the tab film was not cut after the battery was assembled.

〔タブフィルム突出長さの測定〕
上記実施例1および比較例1にかかる電池を30個用意し、タブフィルムがラミネートフィルムの端部から突出している部分の長さ(突出長さ)Lを測定した。この結果を下記表1に示す。
[Measurement of tab film protrusion length]
Thirty batteries according to Example 1 and Comparative Example 1 were prepared, and the length (protrusion length) L of the portion where the tab film protruded from the end portion of the laminate film was measured. The results are shown in Table 1 below.

Figure 0004781070
Figure 0004781070

上記表1から、タブフィルムに未溶着部分を設け、電池組み立て後この部分を切断した実施例1は、平均突出長さが1.0mmと、未溶着部分を設けず、切断を行わなかった比較例1の1.5mmよりも小さくできることがわかる。また、実施例1の標準偏差σが0.15mmと、比較例1の0.40mmよりもはるかにバラツキを小さくできたことがわかる。   From Table 1 above, Example 1 in which an unwelded portion was provided on the tab film, and this portion was cut after the battery was assembled, the average protrusion length was 1.0 mm, and the unwelded portion was not provided and the comparison was not performed. It can be seen that it can be smaller than 1.5 mm in Example 1. Further, it can be seen that the standard deviation σ of Example 1 was 0.15 mm, which was much smaller than that of Comparative Example 1 of 0.40 mm.

このことは、次のように考えられる。実施例1のように、電池組み立て後にタブフィルムを切断すると、突出長さLを小さくできるとともに、切断除去工程においてはタブフィルムの突出長さLを制御しやすい。これに対し、比較例1では、切断を行わないため突出長さが大きくなり、且つ突出長さLを制御できない。   This is considered as follows. When the tab film is cut after battery assembly as in Example 1, the protruding length L can be reduced, and the protruding length L of the tab film can be easily controlled in the cutting and removing process. On the other hand, in Comparative Example 1, since the cutting is not performed, the protruding length is increased, and the protruding length L cannot be controlled.

よって、実施例1によると、タブフィルムの突出長さを必要最低限に設定できるため、集電タブとラミネートフィルムの金属層との接触を確実に防止でき、且つ集電タブの折り曲げや、保護回路の配線・端子の取り付けが容易な封口電池が得られる。   Therefore, according to Example 1, since the protruding length of the tab film can be set to the minimum necessary, the contact between the current collecting tab and the metal layer of the laminate film can be reliably prevented, and the current collecting tab can be bent and protected. A sealed battery in which circuit wiring and terminals can be easily attached is obtained.

なお、上記実施例では、タブフィルムの未溶着部分5b・6bを全て切断する構成を用いて説明したが、切断後のタブフィルムに未溶着部分が残っていてもよい。   In addition, although the said Example demonstrated using the structure which cut | disconnects all the unwelded parts 5b * 6b of a tab film, the unwelded part may remain in the tab film after a cutting | disconnection.

以上説明したように、本発明によると、フィルム状外装体を有する電池におけるタブフィルムの外装体からの突出長さを必要最低限度に制御でき得る電池を提供できる。この電池を用いると、保護回路等を取り付けた電池パッケージとなすことが容易となるので、産業上の意義は大きい。   As described above, according to the present invention, it is possible to provide a battery that can control the protruding length of the tab film from the outer package in the battery having the film-shaped outer package to the minimum necessary level. When this battery is used, it is easy to make a battery package with a protection circuit or the like attached thereto, which is of great industrial significance.

図1は、本発明のフィルム状外装体を有する電池の正面図である。FIG. 1 is a front view of a battery having a film-like exterior body of the present invention. 図2は、図1に示す電池のA−A断面図である。FIG. 2 is a cross-sectional view of the battery shown in FIG. 図3は、本発明の他の態様を示す電池の正面図である。FIG. 3 is a front view of a battery showing another embodiment of the present invention. 図4は、タブフィルムが取り付けられた集電タブを示す図であって、図4(a)は比較例1、図4(b)は実施例1のものを示す。4A and 4B are diagrams showing a current collecting tab to which a tab film is attached. FIG. 4A shows the comparative example 1, and FIG. 4B shows the example 1. FIG. 図5は、フィルム外装体の構成材であるアルミニウムラミネートフィルムの断面構造を示す図である。FIG. 5 is a diagram showing a cross-sectional structure of an aluminum laminate film that is a constituent material of the film outer package. 図6は、特許文献1に係るフィルム状外装体を用いた電池の正面図である。FIG. 6 is a front view of a battery using the film-shaped exterior body according to Patent Document 1. FIG. 図7は、比較例1に係るフィルム状外装体を用いた電池の正面図である。FIG. 7 is a front view of a battery using the film-shaped exterior body according to Comparative Example 1. 図8は、タブ突出封止部における集電タブとラミネートフィルムの金属層との接触を示す図である。FIG. 8 is a diagram showing the contact between the current collecting tab and the metal layer of the laminate film in the tab protrusion sealing portion.

符号の説明Explanation of symbols

1 電極体
2 収納空間
3 フィルム状外装体
4a、4b、4c 封止部
5 正極タブフィルム
6 負極タブフィルム
7 正極集電タブ
8 負極集電タブ
100 金属層
101 ナイロン層
102 ポリプロピレン層
103 ドライラミネート接着剤層
104 カルボン酸変性ポリプロピレン層
DESCRIPTION OF SYMBOLS 1 Electrode body 2 Storage space 3 Film-shaped exterior body 4a, 4b, 4c Sealing part 5 Positive electrode tab film 6 Negative electrode tab film 7 Positive electrode current collection tab 8 Negative electrode current collection tab 100 Metal layer 101 Nylon layer 102 Polypropylene layer 103 Dry laminate adhesion Agent layer 104 Carboxylic acid-modified polypropylene layer

Claims (3)

集電タブ本体に絶縁性タブフィルムが付された正極集電タブを備える正極と、集電タブ本体に絶縁性タブフィルムが付された負極集電タブを備える負極と、を有する電極体と、
金属層と樹脂層とが積層されたラミネートフィルムからなり、その内部に前記電極体が収納された外装体であって、前記正負集電タブの先端側が外部に突出された状態で熱融着されたタブ突出封止部を有する外装体と、
を備える封口電池において、
前記正負集電タブが、少なくとも前記タブ突出封止部において集電タブ本体とタブフィルムとが接着され、前記タブ突出封止部近傍よりも先端側においては集電タブ本体とタブフィルムとが接着されていない、
ことを特徴とする封口電池。
An electrode body having a positive electrode having a positive electrode current collecting tab with an insulating tab film attached to the current collecting tab body, and a negative electrode having a negative electrode current collecting tab with an insulating tab film attached to the current collecting tab body;
It is an exterior body made of a laminate film in which a metal layer and a resin layer are laminated, and the electrode body is housed therein, and is heat-sealed with the positive and negative current collecting tabs protruding to the outside. An exterior body having a tab protruding sealing portion;
In a sealed battery comprising:
The positive and negative current collecting tabs are bonded to the current collecting tab body and the tab film at least in the tab protruding sealing portion, and the current collecting tab main body and the tab film are bonded closer to the tip side than the vicinity of the tab protruding sealing portion. It has not been,
A sealed battery characterized by that.
集電タブ本体に絶縁性タブフィルムが付された正極集電タブを備える正極と、集電タブ本体に絶縁性タブフィルムが付された負極集電タブを備える負極と、を有する電極体と、
金属層と樹脂層とが積層されたラミネートフィルムからなり、その内部に前記電極体が収納された外装体であって、前記正負集電タブの先端側が外部に突出された状態で熱融着されたタブ突出封止部を有する外装体と、
を備える封口電池の製造方法において、
前記製造方法は、
前記タブ突出封止部に位置させる予定部位における集電タブ本体とタブフィルムとが接着され、前記予定部位とその近傍を除く先端側部分における集電タブ本体とタブフィルムが接着されていない構造の集電タブを、正負電極にそれぞれ取り付ける集電タブ取り付け工程と、
前記正負集電タブが取り付けられた正負電極を用いて前記電極体を作製する電極体作製工程と、
前記電極体形成工程の後、前記正負集電タブを外装体外に突出させた状態で、前記電極体を前記外装体内に収納し、しかる後に正負集電タブが突出した外装体開口部分を加熱溶着し封止してなるタブ突出封止部を形成するタブ突出部形成工程と、
前記タブ突出部形成工程の後、外装体の端部から突出した部位であって集電タブ本体と接着されていない部位においてタブフィルムのみを切断し除去するタブフィルム切断除去工程と、
を備えることを特徴とする封口電池の製造方法。
An electrode body having a positive electrode having a positive electrode current collecting tab with an insulating tab film attached to the current collecting tab body, and a negative electrode having a negative electrode current collecting tab with an insulating tab film attached to the current collecting tab body;
It is an exterior body made of a laminate film in which a metal layer and a resin layer are laminated, and the electrode body is housed therein, and is heat-sealed with the positive and negative current collecting tabs protruding to the outside. An exterior body having a tab protruding sealing portion;
In a manufacturing method of a sealed battery comprising:
The manufacturing method includes:
The current collector tab main body and the tab film are bonded to each other at the planned portion to be positioned in the tab protruding sealing portion, and the current collector tab main body and the tab film are not bonded to each other at the tip side excluding the predetermined portion and the vicinity thereof. A current collecting tab mounting step for attaching the current collecting tabs to the positive and negative electrodes, respectively;
An electrode body manufacturing step of manufacturing the electrode body using positive and negative electrodes to which the positive and negative current collecting tabs are attached;
After the electrode body forming step, the electrode body is housed in the exterior body with the positive and negative current collecting tabs protruding outside the exterior body, and then the exterior body opening portion where the positive and negative current collection tabs are projected is heat-welded. And tab protruding portion forming step for forming a tab protruding sealing portion formed by sealing,
After the tab protruding portion forming step, a tab film cutting and removing step for cutting and removing only the tab film at a portion protruding from the end of the exterior body and not bonded to the current collecting tab main body,
A method for manufacturing a sealed battery, comprising:
前記接着が、熱融着である、
ことを特徴とする請求項2に記載の封口電池の製造方法。

The adhesion is thermal fusion;
The manufacturing method of the sealing battery of Claim 2 characterized by the above-mentioned.

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US20150125732A1 (en) * 2012-05-25 2015-05-07 Nec Energy Devices, Ltd. Positive electrode for non-aqueous electrolyte battery and non-aqueous electrolyte secondary battery
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