JP5314837B2 - Lead wire coated film material for battery and film coated lead wire for battery - Google Patents

Lead wire coated film material for battery and film coated lead wire for battery Download PDF

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JP5314837B2
JP5314837B2 JP2006186816A JP2006186816A JP5314837B2 JP 5314837 B2 JP5314837 B2 JP 5314837B2 JP 2006186816 A JP2006186816 A JP 2006186816A JP 2006186816 A JP2006186816 A JP 2006186816A JP 5314837 B2 JP5314837 B2 JP 5314837B2
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lead wire
film
battery
container
heat
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JP2008016337A5 (en
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美道 宮島
広治 南谷
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Showa Denko Packaging Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Description

本発明は、電池用リード線被覆フィルム材および電池用フィルム被覆リード線に関する。   The present invention relates to a battery lead wire covering film material and a battery film covering lead wire.

なお、この明細書において、発電要素とは、密封容器内に収納せられている正極、負極、隔膜および電解液等をいう。また、密封容器には、一対のフランジ付トレイ状成形容器半体を合着してなる容器の外に一対のフィルムの周縁部を接合してなる袋も含まれる。   In this specification, the power generation element refers to a positive electrode, a negative electrode, a diaphragm, an electrolytic solution, and the like housed in a sealed container. Further, the sealed container includes a bag formed by joining the peripheral portions of a pair of films outside a container formed by joining a pair of flanged tray-shaped molded container halves.

従来の電池とくに薄型のポリマー電池用リード線は、発電要素密封容器内部の正極および負極にそれぞれ接続せられかつ容器外部に端部が取り出されており、容器が、金属層および熱可塑性合成樹脂層を含む一対の容器半体を熱可塑性合成樹脂層どうし内側にし、その周縁部において熱融着せしめてなるものであり、リード線の長さの中間が両容器半体周縁部の合わせ目に介在されている。
リード線の前記合わせ目相当部分は、2枚の熱可塑性樹脂フィルムで挾まれ、これらがリード線に熱融着被覆せられており、この被覆フィルムにより、リード線は両容器半体周縁部にその合わせ目で熱融着せられる。
Conventional batteries, particularly thin polymer battery leads, are connected to the positive and negative electrodes inside the power generation element sealed container, respectively, and the ends are taken out of the container. The container is made of a metal layer and a thermoplastic synthetic resin layer. A pair of container halves including the inner side of the thermoplastic synthetic resin layer are heat-sealed at the periphery thereof, and the middle of the length of the lead wire is interposed at the joint of the periphery of both container halves Has been.
The portion corresponding to the seam of the lead wire is sandwiched between two thermoplastic resin films, which are heat-sealed and coated on the lead wire. With this coating film, the lead wire is placed on the periphery of both container halves. It is heat-sealed at the joint.

上記ポリマー電池は、近年用途の拡大により出力の増大が要求され、電池寸法が大型化の傾向にあり、それにともなって電池に用いられる帯板状リード線も大型化してきている。そのため、従来の被覆フィルムは、これをリード線に熱融着させる場合、高い熱融着条件が必要となり、その結果、熱可塑性樹脂の流れ出し量が大きくなってリード線のエッジが露出し、リード線と容器半体中の金属層間の絶縁性が不十分なことにより、短絡が発生することがある。   In recent years, the polymer battery has been required to increase its output due to the expansion of applications, and the size of the battery tends to increase, and accordingly, the strip-shaped lead wire used for the battery has also increased in size. Therefore, when the conventional coated film is heat-sealed to the lead wire, a high heat-sealing condition is required. As a result, the amount of the thermoplastic resin flowing out becomes large and the lead wire edge is exposed, leading to the lead wire. A short circuit may occur due to insufficient insulation between the wire and the metal layers in the container half.

そこで、この短絡を防止するために、下記特許文献1に開示されているように、容器半体中の金属層と熱可塑性合成樹脂層との間に、熱融着時に溶融しない絶縁層が介在されているものが知られている。しかしながら、これは容器半体の製造時に余分に絶縁層を設けるための工程が増え、コスト高となる欠点がある。   Therefore, in order to prevent this short circuit, an insulating layer that does not melt at the time of thermal fusion is interposed between the metal layer in the container half and the thermoplastic synthetic resin layer as disclosed in Patent Document 1 below. What is being known. However, this has the disadvantage that the number of steps for providing an extra insulating layer during the production of the container half increases and the cost is increased.

この欠点を解消するため、絶縁層を設けることなく、リード線と容器半体中の金属層間に短絡が発生しないようにしたものとして、下記特許文献2に開示されているように、金属層および熱可塑性合成樹脂層を含む一対の容器半体の熱可塑性合成樹脂層に絶縁性粒子が散在含有せしめられているものが提案せられている。
特開平9−283100号公報 特開2000−173558号公報
In order to eliminate this defect, as disclosed in Patent Document 2 below, the metal layer and the metal layer in the container half are prevented from being short-circuited without providing an insulating layer. It has been proposed that insulating particles are interspersed in a thermoplastic synthetic resin layer of a pair of container halves including a thermoplastic synthetic resin layer.
JP-A-9-283100 JP 2000-173558 A

なるほど、特許文献2に開示の提案によれば、容器半体一対を絶縁性粒子含有熱可塑性合成樹脂層どうし内側にし、リード続を挟んでその周縁部において熱融着すると、リード線と容器半体の金属層との間に絶縁性粒子が介在し、リード線と金属層との短絡するおそれがない。しかしながら、絶縁性粒子含有熱可塑性合成樹脂層では、リード線との熱融着が十分でなく、発電要素密封容器の気密性が低下し、電解液の漏洩や水分の浸透による電池性能の低下のおそれがある。   Indeed, according to the proposal disclosed in Patent Document 2, when a pair of container halves are placed inside the insulating synthetic resin-containing thermoplastic synthetic resin layers, and are thermally fused at the peripheral edge of the lead connection, the lead wire and the container half Insulating particles are interposed between the metal layer of the body and there is no possibility of short circuit between the lead wire and the metal layer. However, in the thermoplastic synthetic resin layer containing insulating particles, heat fusion with the lead wire is not sufficient, the hermeticity of the power generation element sealed container is lowered, and the battery performance is reduced due to leakage of electrolyte and penetration of moisture. There is a fear.

本発明の目的は、発電要素密封容器の気密性を低下させることなく、リード線と容器半体中の金属層とが短絡するおそれのない電池用リード線を提供するにある。   The objective of this invention is providing the lead wire for batteries which does not have a possibility that a lead wire and the metal layer in a container half may short-circuit, without reducing the airtightness of a power generation element sealed container.

請求項1の発明による電池用リード線被覆フィルム材は、電池の発電要素密封容器が、金属層および熱可塑性合成樹脂層を含む一対の容器半体を熱可塑性合成樹脂層どうし内側にし、その周縁部において熱融着せしめられてなるものであり、容器内部の正極および負極にそれぞれ接続せられかつ両容器半体周縁部の合わせ目から容器外部に端部が取り出されるリード線の少なくとも合わせ目相当部分に局部的に熱融着被覆せられ、両容器半体周縁部に熱融着するためのフィルム材であって、フィルム材が少なくとも外層、中間層および内層の3層の熱可塑性合成樹脂層からなり、そのうち中間層全体に粒径5〜1 0 0μmの絶縁性微粒子が散在含有せしめられかつ中間層の熱可塑性合成樹脂に対する絶縁性微粒子の含有割合が、1〜30重量%であることを特徴とするものである。 The lead wire covering film material for a battery according to the invention of claim 1 is such that the power generation element sealed container of the battery has a pair of container halves including a metal layer and a thermoplastic synthetic resin layer inside the thermoplastic synthetic resin layers, and its peripheral edge At least the seam corresponding to the lead wire connected to the positive electrode and the negative electrode inside the container and having the end part taken out from the joint of the peripheral part of both container halves to the outside of the container. A film material that is locally heat-sealed and coated on the peripheral portions of both container halves, wherein the film material comprises at least three outer layers, an intermediate layer, and an inner layer of a thermoplastic synthetic resin layer Among them, insulating fine particles having a particle diameter of 5 to 100 μm are dispersed and contained in the entire intermediate layer, and the content ratio of the insulating fine particles to the thermoplastic synthetic resin in the intermediate layer is 1 to 30 weights. % .

上記フィルム材を構成する少なくとも3層の熱可塑性合成樹脂の具体例としては、ポリエチレン、低密度ポリエチレン、高密度ポリエチレン、酸変性ポリエチレン、ブロックポリプロピレン、ランダムポリプロピレン、酸変性ポリプロピレン、アイオノマー等の熱融着性に優れた樹脂であることが好ましい。
上記少なくとも3層は同じ熱可塑性合成樹脂でもよいし、異なる熱可塑性合成樹脂でもよい。
Specific examples of at least three layers of thermoplastic synthetic resin constituting the film material include heat fusion of polyethylene, low density polyethylene, high density polyethylene, acid-modified polyethylene, block polypropylene, random polypropylene, acid-modified polypropylene, ionomer, and the like. It is preferable that it is resin excellent in property.
The at least three layers may be the same thermoplastic synthetic resin or different thermoplastic synthetic resins.

上記リード線は、通常電極と同材質のものが使用されるが、異なる材質のものであってもよい。一般的には、正極材にアルミニウムが、負極材にニッケルや銅が使用されるので、正極に接続せられるリード線にはアルミニウムが、負極に接続せられるリード線にはニッケルや銅が使用される。   The lead wire is usually made of the same material as the electrode, but may be made of a different material. Generally, aluminum is used for the positive electrode material, and nickel or copper is used for the negative electrode material. Therefore, aluminum is used for the lead wire connected to the positive electrode, and nickel or copper is used for the lead wire connected to the negative electrode. The

上記絶縁性微粒子の素材の具体例としては、酸化ケイ素、酸化マグネシウム、酸化アルミニウム、炭酸カルシウム、ポリエチレンテレフタレート、ポリアマイド、フェノール樹脂、エポキシ樹脂等が挙げられる。これら絶縁性微粒子の粒径は5〜1 0 0μmに限定したのは、粒径が5μm未満であると、リード線と容器半体中の金属層とが短絡するおそれがあり、100μmを超えると、絶縁性微粒子含有熱可塑性合成樹脂層の厚さを不必要に大きくしなければならないからである。 Specific examples of the material for the insulating fine particles include silicon oxide, magnesium oxide, aluminum oxide, calcium carbonate, polyethylene terephthalate, polyamide, phenol resin, and epoxy resin. The particle size of these insulating fine particles is limited to 5 to 100 μm. If the particle size is less than 5 μm, the lead wire and the metal layer in the container half may be short-circuited. , Ru der the thickness of the insulating fine particles containing thermoplastic synthetic resin layer do not have to be unnecessarily large.

記において、中間層の熱可塑性合成樹脂に対する絶縁性微粒子の含有割合を1〜30重量%に限定したのは、1重量%未満では、リード線と容器半体中の金属層とが短絡するおそれがあり、逆に30重量%を超えると、絶縁性微粒子含有熱可塑性合成樹脂層の強度が弱くなり、同様にリード線と容器半体中の金属層とが短絡するおそれがあるからである。1〜30重量%のなかでもとくに好ましくは、5〜15重量%である。 In the above SL, The reason for limiting the content of the insulating fine particles to the thermoplastic synthetic resin of the intermediate layer to 30 wt%, in less than 1 wt%, and the metal layer of the lead wire and the container half in a short circuit On the contrary, if it exceeds 30% by weight, the strength of the insulating synthetic fine particle-containing thermoplastic synthetic resin layer becomes weak, and there is a possibility that the lead wire and the metal layer in the container half are similarly short-circuited. . Especially preferably, it is 5 to 15 weight% in 1 to 30 weight%.

請求項2の発明による電池用フィルム被覆リード線は、請求項1記載の電池用リード線被覆フィルム材より得た一対の対向状フィルムで1本のリート゛線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挟まれ、両フィルムがリード線に熱融着せられるとともに、リード線の両側方に突出した両フィルムの縁部どうしが熱融着せられてリード線がフィルムにより局部的に被覆されていることを特徴とするものである。 The film-coated lead wire for a battery according to the invention of claim 2 is a pair of opposed films obtained from the battery lead-wire-coated film material according to claim 1 and is a peripheral edge of both container halves within the length of one lead wire. A predetermined portion including a portion corresponding to the joint of the portions is sandwiched, and both films are heat-sealed to the lead wire, and the edges of both films protruding to both sides of the lead wire are heat-sealed to lead wire Is locally covered with a film.

請求項3の発明による電池用フィルム被覆リード線は、請求項1記載の電池用リード線被覆フィルム材より得た一対の対内状フィルムで所定間隔をおいた2本のリード線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挟まれ、両フィルムがリード線に熱融着せられるとともに、2本のリード線の間および両側方に突出した両フィルムの縁部どうしが熱融着せられて2本のリード線がフィルムにより局部的に被覆されていることを特徴とするものである。 A battery film-coated lead wire according to the invention of claim 3 is a length of two lead wires spaced apart by a pair of inward films obtained from the battery lead wire-coated film material of claim 1. A predetermined portion including a portion corresponding to the joint between the peripheral edges of both container halves is sandwiched, both films are heat-sealed to the lead wires, and the edges of both films projecting between the two lead wires and on both sides The two parts are heat-sealed and the two lead wires are locally covered with a film.

請求項4の発明による電池用フィルム被覆リード線は、請求項1記載の電池用リード線被覆フィルム材より得た2つ折りフィルムでリード線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挟まれ、2つ折りフィルムの両半分がリード線に熱融着せられるとともに、リード線の一側方に突出した縁部どうしが熱融着せられてリード線がフィルムにより局部的に被覆されていることを特徴とするものである。 The film-covered lead wire for a battery according to the invention of claim 4 is a half-fold film obtained from the lead wire-covered film material for battery according to claim 1 , and is a joint between the peripheral edges of both container halves in the length of the lead wire. A predetermined part including the corresponding part is sandwiched, and both halves of the two-fold film are heat-sealed to the lead wire, and the edges protruding to one side of the lead wire are heat-sealed so that the lead wire is made of film. It is characterized by being covered locally.

請求項5の発明による電池用フィルム被覆リード線は、請求項1記載の電池用リード線被覆フィルム材より得た2つ折りフィルムで所定間隔をおいた2本のリード線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挾まれ、2つ折りフィルムの両半分がリード線に熱融着せられるとともに、2本のリード線の間および片方のリード線の一側方に突出した縁部どうしが熱融着せられて2本のリード線がフィルムにより局部的に被覆されていることを特徴とするものである。 The battery-coated lead wire for a battery according to the invention of claim 5 is a container in which the two lead wires are separated from each other by a two-fold film obtained from the battery lead wire-covered film material of claim 1 with a predetermined interval. A predetermined portion including a portion corresponding to the joint of the peripheral edge of the half body is sandwiched, and both halves of the two-fold film are thermally fused to the lead wire, and between the two lead wires and one side of one of the lead wires The edge portions protruding in the direction are heat-sealed, and two lead wires are locally covered with a film.

請求項1の発明による電池用リード線被覆フィルム材を用いた請求項2ないし5のいずれかの発明による電池用フィルム被覆リード線によれば、発電要素密封容器の気密性が低下することなく、リード線と容器半体中の金属層とが短絡するおそれもない。 According to the battery film-coated lead wire according to any one of claims 2 to 5 using the battery lead wire-coated film material according to the invention of claim 1 , the airtightness of the power generation element sealed container is not reduced. There is no possibility that the lead wire and the metal layer in the container half are short-circuited.

本発明を実施するための最良の形態を、以下図面を参照して説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図1に示す薄型ポリマー電池の発電要素密封容器(1)は、図2および図3に示すように、外側から順に表面保護層となる熱可塑性合成樹脂層(4)、バリア層となるアルミニウム箔層(5)および融着層となる熱可塑性合成樹脂層(6)よりなる一対のフランジ付トレイ状成形容器半体(7)(8)の内面熱可塑性合成樹脂層(6)どうしを内側にし、フランジ部分であるその周縁部(9)(10)において熱融着せられてなるものであり、電池用フィルム被覆リード線(2)(3)は、容器(1)内部の正極および負極(図示略)にそれぞれ接続せられかつ両容器半体(7)(8)周縁部の合わせ目から容器(1)外部に端部が取り出されている。各リード線(2)(3)は、図5に示すように、予め周縁部(9)(10)の幅を含みその外側まで突出しかつその両側面を覆いうる大きさの1対のフィルム(11)(12)で挾まれて局部的に熱融着被覆せられている。フィルム(11)(12)は、外層(13)、中間層(14)および内層(15)の3層の部可塑性合成樹脂からなり、そのうち中間層(14)に絶縁性微粒子(16)が散在含有せしめられている図4の電池用リード線被覆フィルム材(F)から前記大きさに裁断して得られたものである。   As shown in FIGS. 2 and 3, the power generation element sealed container (1) of the thin polymer battery shown in FIG. 1 is composed of a thermoplastic synthetic resin layer (4) that serves as a surface protective layer and an aluminum foil that serves as a barrier layer. The inner surface thermoplastic synthetic resin layers (6) of the pair of flanged tray-shaped molded container halves (7) and (8) comprising the layer (5) and the thermoplastic synthetic resin layer (6) to be the fusion layer are placed inside. The film-coated lead wires (2) and (3) for the battery are coated with a positive electrode and a negative electrode (shown in the figure). And ends of the container halves (7) and (8) are taken out from the joints of the peripheral edges of the container (1). As shown in FIG. 5, each lead wire (2) (3) includes a pair of films (including a width of the peripheral portion (9) (10)) that protrudes to the outside and covers both sides thereof. 11) It is encased in (12) and locally heat-sealed. The films (11) and (12) are made of a three-layered plastic synthetic resin comprising an outer layer (13), an intermediate layer (14), and an inner layer (15), of which insulating fine particles (16) are scattered in the intermediate layer (14). It is obtained by cutting into the above size from the battery lead wire covering film material (F) of FIG. 4 contained.

上記実施形態では、各リード線(2)(3)を被覆するために一対のフィルム(11)(12)が用いられたが、図6に示すように、図4に示す電池用リード線被覆フィルム材(F)から裁断して得た2つ折りフィルム(17)で各リード線(2)(3)を挟み、局部的に熱融着被覆してもよい。
さらに、図1の鎖線で示すように、電池用リード縁被覆フィルム材(F)から得た一対の対向状フィルムで所定間隔をおいた2本のリード線(2)(3)を挾み、両フィルムを2本のリード線(2)(3)に熱融着するとともに、2本のリード線(2)(3)の間および両側方に突出した両フィルムの縁部どうしを融着し、2本のリード線(2)(3)をフィルムによりともに局部的に被覆してもよい。2つ折りフィルムの場合も、2本のリード線(2)(3)をフィルムによりともに局部的に被覆することができる。
In the above embodiment, a pair of films (11) and (12) are used to cover each lead wire (2) and (3). However, as shown in FIG. 6, the battery lead wire coating shown in FIG. The lead wires (2) and (3) may be sandwiched between two folded films (17) obtained by cutting from the film material (F), and may be locally heat-sealed.
Furthermore, as shown by the chain line in FIG. 1, the two lead wires (2) and (3) spaced by a pair of opposed films obtained from the battery lead edge covering film material (F) are sandwiched, Both films are heat-sealed to the two lead wires (2) and (3), and the edges of both films protruding between the two lead wires (2) and (3) and both sides are fused. The two lead wires (2) and (3) may be locally covered with a film. Also in the case of a two-fold film, the two lead wires (2) and (3) can be locally covered together with the film.

一対のフィルム(11)(12)の素材である電池用リード線被覆フィルム材(F)の厚さは、150μmであり、外層(13)の厚さは25μmで、熱可塑性合成樹脂としてランダムポリプロピレンが用いられており、中間層(14)の厚さは100μmで、熱可塑性合成樹脂としてブロックポリプロピレンが用いられ、これに絶縁性微粒子(16)として平均粒径30μmの酸化マグネシウムがブロックポリプロピレンに対し10重量%含有せしめられて散在せしめられており、内層(15)の厚さは25μmで、熱可塑性合成樹脂として酸変性ポリプロピレンが用いられている。   The battery lead wire covering film material (F), which is the material of the pair of films (11) and (12), has a thickness of 150 μm, the outer layer (13) has a thickness of 25 μm, and is a random polypropylene as a thermoplastic synthetic resin. The thickness of the intermediate layer (14) is 100 μm, block polypropylene is used as the thermoplastic synthetic resin, and magnesium oxide having an average particle size of 30 μm as the insulating fine particles (16) is compared to the block polypropylene. The inner layer (15) has a thickness of 25 μm, and acid-modified polypropylene is used as a thermoplastic synthetic resin.

正極に接続せられるリード線(2)として、厚さ200μmで幅10mmのアルミニウム製薄帯板が用いられ、負極に接続せられるリード線(3)として、同寸法のニッケル製薄帯板が用いられた。   An aluminum ribbon having a thickness of 200 μm and a width of 10 mm is used as the lead wire (2) connected to the positive electrode, and a nickel ribbon having the same dimensions is used as the lead wire (3) connected to the negative electrode. It was.

各リード線(2)(3)をそれぞれ上記大きさの1対のフィルム(11)(12)の間に介在させ、250°Cで10秒間、0.2Mpaの加圧条件で局部的に熱融着被覆し、電池用フィルム被覆リード線となした。   Each lead wire (2) (3) is interposed between a pair of films (11) and (12) each having the above-mentioned size, and heated locally at 250 ° C. for 10 seconds under a pressure of 0.2 Mpa. The film was coated by fusion bonding to form a film-coated lead wire for a battery.

外層(13)の熱可塑性合成樹脂として低密度ポリエチレンが用いられ、中間層(14)の熱可塑性合成樹脂として高密度ポリエチレンが用いられ、内層(15)の熱可塑性合成樹脂として酸変性ポリエチレンが用いられた以外は、実施例1と同じである。   Low density polyethylene is used as the thermoplastic synthetic resin of the outer layer (13), high density polyethylene is used as the thermoplastic synthetic resin of the intermediate layer (14), and acid-modified polyethylene is used as the thermoplastic synthetic resin of the inner layer (15). Example 1 is the same as Example 1.

比較例1Comparative Example 1

中間層の熱可塑性合成樹脂に絶縁性微粒子が合有せしめられていない以外は、実施例2と同じである。   Example 2 is the same as Example 2 except that the insulating fine particles are not combined with the thermoplastic synthetic resin of the intermediate layer.

比較例2Comparative Example 2

一対のフィルムとして、各1層のみからなるアイオノマーが用いられた以外は、実施例1と同じである。   Example 1 is the same as Example 1 except that an ionomer consisting of only one layer is used as the pair of films.

上記各例のフィルムが被覆された正極および負極に接続せられる2本のリード線を評価試料として10組用意し、各リード線を外側から順に表面保護層となる熱可塑性合成樹脂層、バリア層となる金属層および融着層となる熱可塑性合成樹脂層よりなる容器を構成する一対のフランジ付トレイ状成形容器半体の周縁部間に挟み、250°Cの加熱下で10秒間、0.2Mpaで圧着した。
容器半体のバリア層となる金属層端面と、リード線の介在させられている被覆フィルムとの直列抵抗値を三和電気製作所マルチテスターJR-8Dにより測定し、その直列抵抗値がKΩの試料を被覆フィルムの絶縁性が正常で短絡が発生していないものとし、この値を超える試料を絶縁性が不十分で短絡が発生しているものとして評価した。その結果を表1に示す。なお表1には、試料組数を分母に、短絡発生試料組数を分子として示した。
Ten sets of two lead wires connected to the positive electrode and the negative electrode coated with the film of each of the above examples are prepared as evaluation samples, and each lead wire is a thermoplastic synthetic resin layer and a barrier layer serving as a surface protective layer in order from the outside. Sandwiched between the peripheral edges of a pair of flanged tray-shaped molded container halves constituting a container composed of a metal layer to become a thermoplastic synthetic resin layer to be a fusion layer, and heated at 250 ° C. for 10 seconds, 0. Crimped at 2 MPa.
The series resistance value of the metal layer end face serving as the barrier layer of the container half and the covering film with the lead wires interposed therebetween is measured by Sanwa Electric Multi-tester JR-8D, and the series resistance value is 0 KΩ. The samples were evaluated as those in which the insulation of the coating film was normal and no short circuit occurred, and the samples exceeding this value were evaluated as having insufficient insulation and causing a short circuit. The results are shown in Table 1. Table 1 shows the number of sample sets as a denominator and the number of short-circuited sample sets as a numerator.

Figure 0005314837
Figure 0005314837

表1に示すように、実施例1および実施例2では、いずれも短絡の発生が見られなかったが、比較例1および比較例2では、短絡が高い確率で見られた。   As shown in Table 1, in Example 1 and Example 2, no short circuit was observed, but in Comparative Example 1 and Comparative Example 2, a short circuit was observed with a high probability.

電池の発電要素密封容器内部の正極および負極にそれぞれ接続せられかつ容器外部に端部が取り出されているフィルム被覆リード線を示す平面図である。It is a top view which shows the film covering lead wire which was connected to the positive electrode and the negative electrode inside a power generation element sealing container of a battery, respectively, and the edge part was taken out outside the container. 図1の一部を切り欠いた部分拡大側面図である。FIG. 2 is a partially enlarged side view in which a part of FIG. 1 is cut away. 図2のIII−III線にそう断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 2. 電池用リード線被覆フィルム材の部分垂直断面図である。It is a partial vertical sectional view of a lead wire covering film material for a battery. 一対の対向状フィルムで局部的に被覆された電池用フィルム被覆リード線の部分斜視図である。It is a fragmentary perspective view of the film-coated lead wire for a battery locally covered with a pair of opposed films. 2つ折りフィルムで局部的に被覆された電池用フィルム被覆リード線の部分斜視図である。It is a fragmentary perspective view of the film-coated lead wire for batteries locally covered with the double fold film.

(1) 電池の発電要素密封容器
(2)(3) 電池用フィルム被覆リード線
(4) 表面保護層となる熱可塑性合成樹脂層
(5) バリア層となる金属層
(6) 融着層となる熟可塑性合成樹脂層
(7)(8) 容器半体
(9)(10) 容器半体の周縁部
(11)(12) フィルム
(13) フィルムの外層
(14) フィルムの中間層
(15) フィルムの内層
(16) 絶縁性微粒子
(17) 2つ折りフィルム
(F) 電池用リード線被覆フィルム材
(1) Battery power generation element sealed container (2) (3) Film-coated lead wire for battery (4) Thermoplastic synthetic resin layer to be a surface protective layer (5) Metal layer to be a barrier layer (6) Fusion layer and Mature plastic synthetic resin layer (7) (8) Container half (9) (10) Perimeter of container half (11) (12) Film (13) Film outer layer (14) Film intermediate layer (15) Inner layer of film (16) Insulating fine particles (17) Folded film (F) Lead wire covering film material for battery

Claims (5)

電池の発電要素密封容器が、金属層および熱可塑性合成樹脂層を含む一対の容器半体を熱可塑性合成樹脂層どうし内側にし、その周縁部において熱融着せしめられてなるものであり、容器内部の正極および負極にそれぞれ接続せられかつ両容器半体周縁部の合わせ目から容器外部に端部が取り出されるリード線の少なくとも合わせ目相当部分に局部的に熱融着被覆せられ、両容器半体周縁部に熱融着するためのフィルム材であって、フィルム材が少なくとも外層、中間層および内層の3層の熱可塑性合成樹脂層からなり、そのうち中間層全体に粒径5〜1 0 0μmの絶縁性微粒子が散在含有せしめられかつ中間層の熱可塑性合成樹脂に対する絶縁性微粒子の含有割合が、1〜30重量%であることを特徴とする電池用リード線被覆フィルム材。   A battery power generation element sealed container is formed by placing a pair of container halves including a metal layer and a thermoplastic synthetic resin layer inside the thermoplastic synthetic resin layers and heat-sealing at the peripheral edge thereof. Are connected to the positive electrode and the negative electrode of the container, and at least a portion corresponding to the joint of the lead wire from which the end of the container half is taken out to the outside of the container is locally heat-sealed. A film material for heat-sealing to a peripheral part of a body, the film material comprising at least three thermoplastic synthetic resin layers of an outer layer, an intermediate layer, and an inner layer, of which the intermediate layer has a particle size of 5 to 100 μm The lead wire covering film material for a battery, wherein the insulating fine particles are dispersed and the content ratio of the insulating fine particles to the thermoplastic synthetic resin of the intermediate layer is 1 to 30% by weight . 請求項1記載の電池用リード線被覆フィルム材より得た一対の対向状フィルムで1本のリード線の長さのうち所定箇所が挟まれ、両フィルムがリード線に熱融着せられるとともに、リード線の両側方に突出した両フィルムの縁部どうしが熱融着せられてリード線がフィルムにより局部的に被覆されていることを特徴とする電池用フィルム被覆リード線。   A predetermined portion of the length of one lead wire is sandwiched between a pair of opposing films obtained from the lead wire covering film material for a battery according to claim 1, and both films are thermally fused to the lead wire, and the lead A film-coated lead wire for a battery, characterized in that edges of both films protruding on both sides of the wire are heat-sealed and the lead wire is locally covered with the film. 請求項1記載の電池用リード線被覆フィルム材より得た一対の対向状フィルムで所定間隔をおいた2本のリード線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挟まれ、両フィルムがリード線に熱融着せられるとともに、2本のリード線の間および両側方に突出した両フィルムの縁部どうしが熱融着せられて2本のリード線がフィルムにより局部的に被覆されていることを特徴とする電池用フィルム被覆リード線。   A portion corresponding to the joint of the peripheral edge portions of both container halves of the length of two lead wires spaced apart from each other by a pair of opposed films obtained from the lead wire covering film material for a battery according to claim 1. A predetermined part including the film is sandwiched, and both films are heat-sealed to the lead wire, and the edges of both films protruding between the two lead wires and both sides are heat-sealed to form the two lead wires. A film-coated lead wire for a battery, which is locally covered with a film. 請求項1記載の電池用リード線被覆フィルム材より得た2つ折りフィルムで1本のリード線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挟まれ、2つ折りフィルムの両半分がリード線に融着せられるとともに、リード線の一側方に突出した2つ折りフィルムの両半分の縁部どうしが熱融着せられてリード線がフィルムにより局部的に被覆されていることを特徴とする電池用フィルム被覆リード線。   A two-fold film obtained from the battery lead wire covering film material according to claim 1 sandwiches a predetermined portion including a portion corresponding to the joint of the peripheral portions of both container halves out of the length of one lead wire, Both halves of the double-fold film are fused to the lead wire, and the edges of the two halves of the double-fold film protruding to one side of the lead wire are heat-sealed to locally cover the lead wire with the film. A film-coated lead wire for a battery. 請求項1記載の電池用リード線被覆フィルム材より得た2つ折りフィルムで所定間隔をおいた2本のリード線の長さのうち両容器半体周縁部の合わせ目に相当する部分を含む所定箇所が挟まれ、2つ折りフィルムの両半分がリード線に熱融着せられるとともに、2本のリード線の間および片方のリード線の一側方に突出した2つ折りフィルムの両半分の縁部どうしが熱融着せられて2本のリード線がフィルムにより局部的に被覆されていることを特徴とする電池用フィルム被覆リード線。   A predetermined portion including a portion corresponding to the joint between the peripheral portions of both container halves out of the lengths of two lead wires separated from each other by a two-fold film obtained from the battery lead wire covering film material according to claim 1. The two halves of the folded film are heat-sealed to the lead wire, and the edges of the two folded film halves projecting between the two lead wires and one side of the one lead wire. A film-coated lead wire for a battery, wherein the two lead wires are locally covered with a film.
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