JP2017117705A - Lead member and battery employing the lead member - Google Patents

Lead member and battery employing the lead member Download PDF

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Publication number
JP2017117705A
JP2017117705A JP2015253412A JP2015253412A JP2017117705A JP 2017117705 A JP2017117705 A JP 2017117705A JP 2015253412 A JP2015253412 A JP 2015253412A JP 2015253412 A JP2015253412 A JP 2015253412A JP 2017117705 A JP2017117705 A JP 2017117705A
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Prior art keywords
conductor
lead member
parallel
thickness
gradually decreasing
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Inventor
聡 岡野
Satoshi Okano
聡 岡野
圭太郎 宮澤
Keitaro Miyazawa
圭太郎 宮澤
貴章 島田
Takaaki Shimada
貴章 島田
基之 宮森
Motoyuki Miyamori
基之 宮森
岡田　智之
Tomoyuki Okada
智之 岡田
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Priority to JP2015253412A priority Critical patent/JP2017117705A/en
Priority to CN201611204723.9A priority patent/CN106920915B/en
Priority to KR1020160177543A priority patent/KR101958523B1/en
Publication of JP2017117705A publication Critical patent/JP2017117705A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

PROBLEM TO BE SOLVED: To provide a lead member capable of appropriately adhering a conductor and an insulation resin film without increasing thickness of an adhesive layer of the insulation resin film more than needed, and a battery.SOLUTION: The present invention relates to a lead member configured by sticking a pair of insulation resin films 5 each including an adhesive layer 5a in a part of a conductor 4 of a metal foil in a length direction. In the lead member, the conductor 4 includes, on cross sections in a width direction: parallel parts 41 in which both the faces are in parallel; gradual reduction parts 42 in which thickness is gradually reduced from the parallel parts 41 to end portions; and edge end portions 43 further closer to the end portions than the gradual reduction parts 42. The gradual reduction part 42 has an inclination equal to or smaller than 45 degrees in relative to the parallel part 41, and the edge end portion 43 has an inclination equal to or larger than 45 degrees in relative to the parallel part 41. The parallel part 41 is four to ten times as thick as the adhesive layer 5a, a boundary portion between the gradual reduction part 42 and the edge end portion 43 is 0.4 to 0.7 times as thick as the parallel part 41, and a value obtained by dividing a contact area between each of the insulation resin films 5 and the conductor 4 with thickness of the adhesive layer 5a is equal to or greater than 2,000.SELECTED DRAWING: Figure 3

Description

本発明は、電池から電気を取り出す端子として用いられるアルミニウム箔からなるリード部材および該リード部材を用いた電池に関する。   The present invention relates to a lead member made of an aluminum foil used as a terminal for taking out electricity from a battery, and a battery using the lead member.

特許文献１は、ポリマー型の薄型電池に係る発明であって、バリやカエリのない集電端子を用いることで、短絡や電池内部への水分や酸素の侵入を阻止することが開示されている。
特許文献２は、シート電池に係る発明であって、シート状の外装部材から電池外部へと突出するリード端子を備え、当該リード端子の横断面の形状をリード端子の外側に先細り状とすることが開示されている。
特許文献３は、ポリマー電池のタブ構造に係る発明であって、所定の断面形状を備えた厚さ５０〜５００μｍのタブを用いることが開示されている。 Patent Document 1 discloses an invention related to a polymer-type thin battery, and discloses that a current collector terminal without burrs and burrs is used to prevent short circuit and intrusion of moisture and oxygen into the battery. .
Patent Document 2 is an invention relating to a sheet battery, and includes a lead terminal that protrudes from the sheet-shaped exterior member to the outside of the battery, and the cross-sectional shape of the lead terminal is tapered outside the lead terminal. Is disclosed.
Patent Document 3 discloses an invention relating to a tab structure of a polymer battery, and discloses that a tab having a predetermined cross-sectional shape and a thickness of 50 to 500 μm is used.

特開２０００−２８５９０３号公報JP 2000-285903 A 特開２０００−７７０４４号公報JP 2000-77044 A 特開２００１−５７２０３号公報JP 2001-57203 A

近年、リチウムイオン電池の容量増大の技術が進んでおり、それに伴い、当該電池に用いられるタブリード（リード部材）の導体抵抗がネックになりつつある。この対策としては、リード導体の断面積を大きくするために、リード部材の幅巾を広げたり厚さを増やすことが考えられる。しかし、幅巾を広げると電池サイズが大きくなってしまい、厚さを増やすと導体と絶縁樹脂フィルムとの適切な接着がなされない場合がある。   In recent years, techniques for increasing the capacity of lithium ion batteries have progressed, and accordingly, the conductor resistance of tab leads (lead members) used in the batteries is becoming a bottleneck. As a countermeasure, it is conceivable to increase the width or thickness of the lead member in order to increase the cross-sectional area of the lead conductor. However, when the width is increased, the battery size increases, and when the thickness is increased, the conductor and the insulating resin film may not be properly bonded.

本発明は、リード部材の導体が厚くても絶縁樹脂フィルムの接着層の厚さを必要以上に増すことなく、導体と絶縁樹脂フィルムとが適切に接着可能なリード部材とこれを用いた電池の提供を目的とする。   The present invention provides a lead member capable of appropriately bonding a conductor and an insulating resin film without increasing the thickness of the adhesive layer of the insulating resin film more than necessary even when the conductor of the lead member is thick, and a battery using the lead member. For the purpose of provision.

本発明によるリード部材は、
金属箔からなる導体の両面から前記導体の長さ方向の両端部以外の箇所に一対の絶縁樹脂フィルムが貼り合わされたリード部材であって、
前記一対の絶縁樹脂フィルムは、前記導体と接する側に接着層を備えるとともに、前記導体の前記長さ方向に直交する幅方向において前記導体の外方にはみ出るように配置されて、前記導体の外方にはみ出した部分の前記接着層が互いに貼り合わされ、
前記導体は、前記幅方向に沿った断面において、
前記幅方向の両端部以外の箇所であって前記導体の両面が平行となっている平行部と、
前記平行部から前記幅方向の前記両端部に向けて厚さが漸減する漸減部と、
前記漸減部よりもさらに前記幅方向の前記両端部側に設けられた縁端部と、
を備え、
前記漸減部は前記平行部に対して４５度以下の傾きを有する一方、前記縁端部は前記平行部に対して４５度以上の傾きを有し、
前記平行部の厚さが前記接着層の厚さの４倍以上１０倍以下であり、
前記漸減部と前記縁端部との境界部分の厚さが前記平行部の厚さの０．４倍以上０．７倍以下であり、
前記一対の絶縁樹脂フィルムのいずれかと前記導体との接触面積（ｍｍ２）を前記接着層の厚さ（ｍｍ）で割った値が２０００（ｍｍ）以上である。 The lead member according to the present invention is
It is a lead member in which a pair of insulating resin films are bonded to locations other than both ends in the length direction of the conductor from both sides of a conductor made of metal foil,
The pair of insulating resin films includes an adhesive layer on a side in contact with the conductor, and is disposed so as to protrude outward from the conductor in a width direction orthogonal to the length direction of the conductor. The adhesive layers of the protruding part are stuck together,
In the cross section along the width direction, the conductor,
A parallel part where both sides of the conductor are parallel to each other at both ends in the width direction;
A gradually decreasing portion in which the thickness gradually decreases from the parallel portion toward the both end portions in the width direction;
Edge portions provided on the both end sides in the width direction further than the gradually decreasing portion; and
With
The gradually decreasing part has an inclination of 45 degrees or less with respect to the parallel part, while the edge part has an inclination of 45 degrees or more with respect to the parallel part,
The parallel part has a thickness of 4 to 10 times the thickness of the adhesive layer,
The thickness of the boundary portion between the gradually decreasing portion and the edge portion is not less than 0.4 times and not more than 0.7 times the thickness of the parallel portion,
A value obtained by dividing the contact area (mm 2 ) between one of the pair of insulating resin films and the conductor by the thickness (mm) of the adhesive layer is 2000 (mm) or more.

また、本発明による電池は、
上記に記載のリード部材を有する電池であって、
発電素子が包材内に収容され、
前記リード部材が前記発電素子の電極と接続され、
前記リード部材と前記一対の絶縁樹脂フィルムの長さ方向の一端が前記包材の外側に配置されている。 The battery according to the present invention is
A battery having the lead member described above,
The power generation element is contained in the packaging material,
The lead member is connected to an electrode of the power generation element;
One end of the lead member and the pair of insulating resin films in the length direction is disposed outside the packaging material.

本発明によれば、リード部材の導体が厚くても絶縁樹脂フィルムの接着層の厚さを必要以上に増すことなく、導体と絶縁樹脂フィルムとが適切に接着可能なリード部材とこれを用いた電池を提供することができる。   According to the present invention, even if the conductor of the lead member is thick, the lead member capable of appropriately bonding the conductor and the insulating resin film without increasing the thickness of the adhesive layer of the insulating resin film more than necessary is used. A battery can be provided.

本発明によるリード部材の使用形態の一例を示す図である。It is a figure which shows an example of the usage condition of the lead member by this invention. （ａ），（ｂ）は、比較例に係るリード部材の構造を説明する図である。(A), (b) is a figure explaining the structure of the lead member which concerns on a comparative example. （ａ）は、絶縁樹脂フィルムが貼り付けられる前の導体の幅方向における一部拡大断面図であり、（ｂ）は、図１（ｃ）のＩＩＩ−ＩＩＩ線断面図である。(A) is the partially expanded sectional view in the width direction of the conductor before an insulating resin film is affixed, (b) is the III-III sectional view taken on the line of FIG.1 (c). （ａ）〜（ｄ）は、変形例１〜４に係るリード部材の導体の一部断面図である。(A)-(d) is a partial cross section figure of the conductor of the lead member which concerns on the modifications 1-4.

〈本発明の実施形態の概要〉
最初に本発明の実施形態の概要を説明する。
本発明にかかるリード部材の一実施形態は、
（１）金属箔からなる導体の両面から前記導体の長さ方向の両端部以外の箇所に一対の絶縁樹脂フィルムが貼り合わされたリード部材であって、
前記一対の絶縁樹脂フィルムは、前記導体と接する側に接着層を備えるとともに、前記導体の前記長さ方向に直交する幅方向において前記導体の外方にはみ出るように配置されて、前記導体の外方にはみ出した部分の前記接着層が互いに貼り合わされ、
前記導体は、前記幅方向に沿った断面において、
前記幅方向の両端部以外の箇所であって前記導体の両面が平行となっている平行部と、
前記平行部から前記幅方向の前記両端部に向けて厚さが漸減する漸減部と、
前記漸減部よりもさらに前記幅方向の前記両端部側に設けられた縁端部と、
を備え、
前記漸減部は前記平行部に対して４５度以下の傾きを有する一方、前記縁端部は前記平行部に対して４５度以上の傾きを有し、
前記平行部の厚さが前記接着層の厚さの４倍以上１０倍以下であり、
前記漸減部と前記縁端部との境界部分の厚さが前記平行部の厚さの０．４倍以上０．７倍以下であり、
前記一対の絶縁樹脂フィルムのいずれかと前記導体との接触面積（ｍｍ２）を前記接着層の厚さ（ｍｍ）で割った値が２０００（ｍｍ）以上である。
この構成によれば、接着層の厚さを必要以上に増すことなく、導体と絶縁樹脂フィルムとが適切に接着可能である。 <Outline of Embodiment of the Present Invention>
First, an outline of an embodiment of the present invention will be described.
One embodiment of the lead member according to the present invention is:
(1) A lead member in which a pair of insulating resin films are bonded to a portion other than both end portions in the length direction of the conductor from both sides of a conductor made of metal foil,
The pair of insulating resin films includes an adhesive layer on a side in contact with the conductor, and is disposed so as to protrude outward from the conductor in a width direction orthogonal to the length direction of the conductor. The adhesive layers of the protruding part are stuck together,
In the cross section along the width direction, the conductor,
A parallel part where both sides of the conductor are parallel to each other at both ends in the width direction;
A gradually decreasing portion in which the thickness gradually decreases from the parallel portion toward the both end portions in the width direction;
Edge portions provided on the both end sides in the width direction further than the gradually decreasing portion; and
With
The gradually decreasing part has an inclination of 45 degrees or less with respect to the parallel part, while the edge part has an inclination of 45 degrees or more with respect to the parallel part,
The parallel part has a thickness of 4 to 10 times the thickness of the adhesive layer,
The thickness of the boundary portion between the gradually decreasing portion and the edge portion is not less than 0.4 times and not more than 0.7 times the thickness of the parallel portion,
A value obtained by dividing the contact area (mm 2 ) between one of the pair of insulating resin films and the conductor by the thickness (mm) of the adhesive layer is 2000 (mm) or more.
According to this configuration, the conductor and the insulating resin film can be appropriately bonded without increasing the thickness of the adhesive layer more than necessary.

（２）前記幅方向に沿った前記漸減部の幅は、前記導体の幅の１〜１０％であることが好ましい。
漸減部の幅をなるべく短くすることで、導体の断面積をできるだけ大きくすることができ、電池の容量増大を促進させることができる。 (2) The width of the gradually decreasing portion along the width direction is preferably 1 to 10% of the width of the conductor.
By reducing the width of the gradually decreasing portion as much as possible, the cross-sectional area of the conductor can be increased as much as possible, and the increase in battery capacity can be promoted.

（３）前記漸減部および前記縁端部の表面に有機酸を含む樹脂と金属塩の複合皮膜層が形成されていて、前記複合皮膜層が前記接着層に密着していることが好ましい。
漸減部および縁端部を表面処理することで、導体と絶縁フィルムとの密着を向上させることができる。 (3) It is preferable that a composite coating layer of a resin containing an organic acid and a metal salt is formed on the surface of the gradually decreasing portion and the edge portion, and the composite coating layer is in close contact with the adhesive layer.
By surface-treating the gradually decreasing portion and the edge portion, adhesion between the conductor and the insulating film can be improved.

（４）前記導体は、質別記号がＯであるものであることが好ましい。
Ｏ材を使用することで、リード部材を電池内外の他の金属部材に溶接する場合に、不良とならず、また、リード部材を電池外で折り曲げた場合にリード部材が折れ曲がり部で破断することがない。 (4) It is preferable that the said conductor is what the classification code is O.
By using O material, when the lead member is welded to other metal members inside and outside the battery, it does not become defective, and when the lead member is bent outside the battery, the lead member bends and breaks at the bent portion. There is no.

（５）前記導体は、前記平行部の硬度と前記漸減部の硬度とが同等であることが好ましい。
導体の硬度をできるだけ均一化することで、導体抵抗の増加を抑えることができる。 (5) In the conductor, it is preferable that the parallel portion has the same hardness as the gradually decreasing portion.
By making the hardness of the conductor as uniform as possible, an increase in conductor resistance can be suppressed.

また、本発明にかかる電池の一実施形態は、
（６）上記の（１）から（５）に記載のリード部材を有する電池であって、
発電素子が包材内に収容され、
前記リード部材が前記発電素子の電極と接続され、
前記リード部材と前記一対の絶縁樹脂フィルムの長さ方向の一端が前記包材の外側に配置されている。
この構成によれば、小型で容量の大きな電池を提供することができる。 Moreover, one embodiment of the battery according to the present invention is:
(6) A battery having the lead member according to (1) to (5) above,
The power generation element is contained in the packaging material,
The lead member is connected to an electrode of the power generation element;
One end of the lead member and the pair of insulating resin films in the length direction is disposed outside the packaging material.
According to this configuration, a small battery having a large capacity can be provided.

〈本発明の実施形態の詳細〉
以下、本発明に係るリード部材および電池の実施の形態の例を、図面を参照して説明する。なお、本発明はこれらの例示に限定されるものではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 <Details of Embodiment of the Present Invention>
Examples of embodiments of a lead member and a battery according to the present invention will be described below with reference to the drawings. In addition, this invention is not limited to these illustrations, is shown by the claim, and intends that all the changes within the meaning and range equivalent to a claim are included.

図１および２を参照して、本発明によるリード部材の概略とその使用形態を説明する。図１（ａ）は、電池の外観を示す図であり、図１（ｂ）は、リード部材の封着状態を示す図であり、図１（ｃ）は、リード部材の平面図である。   With reference to FIG. 1 and 2, the outline of the lead member by this invention and its usage form are demonstrated. FIG. 1A is a view showing the appearance of the battery, FIG. 1B is a view showing a sealed state of the lead member, and FIG. 1C is a plan view of the lead member.

図１（ａ）に示すように、電池１は、金属箔を含む多層フィルムからなる封入体２（包材の一例）を備えている。本実施形態における電池１は、例えばリチウムイオン電池等の非水電解質電池である。封入体２は、図示省略するが、正極板と負極板とをセパレータを介して積層した積層電極群（発電素子の一例）および電解液を収納している。正極板にはリード部材３が接続され、負極板にはリード部材３’が接続されている。   As shown to Fig.1 (a), the battery 1 is equipped with the enclosure 2 (an example of a packaging material) which consists of a multilayer film containing metal foil. The battery 1 in the present embodiment is a nonaqueous electrolyte battery such as a lithium ion battery. Although not shown, the enclosure 2 contains a laminated electrode group (an example of a power generation element) in which a positive electrode plate and a negative electrode plate are laminated via a separator, and an electrolytic solution. A lead member 3 is connected to the positive electrode plate, and a lead member 3 'is connected to the negative electrode plate.

封入体２は、電池１の外装ケースとなるもので、例えば、矩形状の２枚の多層フィルム周辺の外周部分を熱溶着してシール部６とすることにより密封される。図１（ｂ）に示すように、封入体２は、少なくとも３層の積層体である多層フィルムから構成されている。最内層フィルム２ａは、電解液で溶解されずシール部６から電解液が漏出するのを防止するのに適したものとしてポリオレフィン樹脂（例：無水マレイン酸変性低密度ポリエチレンまたはポリプロピレン）が用いられる。金属箔層２ｂは、アルミニウム、銅、ステンレス等の金属箔が用いられ、電解液に対する密封性を高めている。最外層フィルム２ｃは、ポリエチレンテレフタレート（ＰＥＴ）等で形成され、薄い金属箔層２ｂを保護している。   The enclosure 2 serves as an outer case of the battery 1. For example, the enclosure 2 is sealed by thermally welding the outer peripheral portion around the two rectangular multilayer films to form the seal portion 6. As shown in FIG.1 (b), the enclosure 2 is comprised from the multilayer film which is a laminated body of at least 3 layers. For the innermost layer film 2a, a polyolefin resin (eg, maleic anhydride-modified low-density polyethylene or polypropylene) is used as a material suitable for preventing the electrolyte solution from leaking from the seal portion 6 without being dissolved by the electrolyte solution. The metal foil layer 2b is made of a metal foil such as aluminum, copper, or stainless steel, and enhances the sealing performance against the electrolytic solution. The outermost layer film 2c is formed of polyethylene terephthalate (PET) or the like and protects the thin metal foil layer 2b.

図１（ｃ）に示すように、リード部材３（３’）は、薄い金属箔が略長方形状にカットされた導体４（４’）を備えている。リード部材３（３’）には、絶縁樹脂フィルム５が予め熱溶着により接合されている。この絶縁樹脂フィルム５と封入体２とが熱融着されることで、リード部材３（３’）と封入体２とが密着される。リード部材３（３’）は封入体２に密封され、リード部材３およびリード部材３’の先端部は、絶縁樹脂フィルム５を介して封入体２のシール部６から突出している。本実施形態においては、リード部材３（３’）が封入体２のシール部６から突出する方向（図１（ｃ）の縦方向）をリード部材３（３’）の長さ方向とし、当該長さ方向と直交する方向（図１（ｃ）の横方向）をリード部材３（３’）の幅方向とする。   As shown in FIG. 1C, the lead member 3 (3 ') includes a conductor 4 (4') obtained by cutting a thin metal foil into a substantially rectangular shape. An insulating resin film 5 is previously bonded to the lead member 3 (3 ') by heat welding. The insulating resin film 5 and the enclosure 2 are heat-sealed, whereby the lead member 3 (3 ') and the enclosure 2 are brought into close contact with each other. The lead member 3 (3 ′) is sealed in the enclosure 2, and the lead member 3 and the leading end of the lead member 3 ′ protrude from the seal portion 6 of the enclosure 2 through the insulating resin film 5. In the present embodiment, the direction in which the lead member 3 (3 ′) protrudes from the seal portion 6 of the enclosure 2 (the vertical direction in FIG. 1C) is the length direction of the lead member 3 (3 ′). A direction orthogonal to the length direction (lateral direction in FIG. 1C) is defined as the width direction of the lead member 3 (3 ′).

導体４（４’）は、リード部材３（３’）が用いられる電池の形状や容量により異なるが、例えば、長さが２０ｍｍ〜７０ｍｍ、幅が１ｍｍ〜９０ｍｍである。導体４（４’）は、長さより幅の方が大きい場合もある。   The conductor 4 (4 ') varies depending on the shape and capacity of the battery in which the lead member 3 (3') is used, but has a length of 20 mm to 70 mm and a width of 1 mm to 90 mm, for example. The conductor 4 (4 ') may have a width larger than the length.

導体４（４’）の長さ方向の両端を除く部分（中間部分）は、絶縁樹脂フィルム５で覆われ、その長さ方向における上端部４ａと下端部４ｂとが露出されている。導体４（４’）の上端部４ａは、封入体２から外側に露出され外部装置等への接続端子とされ、下端部４ｂは、封入体２内で電池１の電極板リード７との接続部とされる。   A portion (intermediate portion) excluding both ends in the length direction of the conductor 4 (4 ') is covered with an insulating resin film 5, and an upper end portion 4a and a lower end portion 4b in the length direction are exposed. The upper end 4a of the conductor 4 (4 ′) is exposed to the outside from the enclosure 2 and serves as a connection terminal to an external device or the like, and the lower end 4b is connected to the electrode plate lead 7 of the battery 1 within the enclosure 2. Part.

絶縁樹脂フィルム５は、図１（ｂ）に示すように、導体４（４’）の両面に位置を合わせて貼り合わされる。絶縁樹脂フィルム５は、導体４（４’）の長さより短く、導体４の幅より広いものが用いられる。絶縁樹脂フィルム５は、例えば、長さが１０ｍｍ〜２０ｍｍ、幅は導体４（４’）の幅よりも１ｍｍ〜１０ｍｍ程度大きいものが用いられる。   As shown in FIG. 1B, the insulating resin film 5 is bonded to both sides of the conductor 4 (4 ') in alignment. The insulating resin film 5 is shorter than the length of the conductor 4 (4 ') and wider than the width of the conductor 4. For example, the insulating resin film 5 having a length of 10 mm to 20 mm and a width of about 1 mm to 10 mm larger than the width of the conductor 4 (4 ') is used.

絶縁樹脂フィルム５は、導体４（４’）の両面にそれぞれ接着される接着層５ａと、耐熱性を有し封入体２（の最内層フィルム２ａ）と融着される耐熱層５ｂとの２層で形成されている。接着層５ａは、加熱溶融により導体４（４’）に密着させて、導体界面における良好な密封封止を形成する。耐熱層５ｂは、接着層５ａの融点より高い融点のものが用いられ、導体４（４’）との密封封止時には溶融が生じないようにして形状を保持する。そして、封入体２とのシール時に、耐熱層５ｂと封入体２と融着させることで、封入体２内の金属箔層２ｂと導体４（４’）が電気的に短絡しないようにすることができる。
なお、絶縁樹脂フィルムは一層または三層以上から構成されてもよい。 The insulating resin film 5 includes an adhesive layer 5a bonded to both surfaces of the conductor 4 (4 '), and a heat-resistant layer 5b having heat resistance and an encapsulated body 2 (the innermost layer film 2a). Formed of layers. The adhesive layer 5a is brought into close contact with the conductor 4 (4 ′) by heating and melting to form a good hermetic seal at the conductor interface. The heat-resistant layer 5b has a melting point higher than that of the adhesive layer 5a, and maintains its shape so that it does not melt when sealed with the conductor 4 (4 ′). And when sealing with the enclosure 2, the heat-resistant layer 5 b and the enclosure 2 are fused to prevent the metal foil layer 2 b and the conductor 4 (4 ′) in the enclosure 2 from being electrically short-circuited. Can do.
The insulating resin film may be composed of one layer or three or more layers.

図１（ｃ）に示すように、絶縁樹脂フィルム５は、導体４（４’）の長さ方向の両端部４ａ，４ｂが露出された状態で、導体４（４’）の幅方向において導体４（４’）の外方にはみ出るように配置されている。そして、絶縁樹脂フィルム５は、導体４（４’）の外方にはみ出した部分が互いに貼り合わされている。   As shown in FIG. 1C, the insulating resin film 5 has a conductor in the width direction of the conductor 4 (4 ′) in a state where both end portions 4a and 4b in the length direction of the conductor 4 (4 ′) are exposed. 4 (4 ') is arranged so as to protrude outward. The insulating resin film 5 is bonded to each other at the portion protruding outward from the conductor 4 (4 ').

図２（ａ）は、比較例に係るリード部材の幅方向の断面図であり、（ｂ）は、比較例に係るリード部材の平面図である。
図２（ａ）、（ｂ）に示すように、比較例に係るリード部材１０３は、導体１０４と、接着層１０５ａおよび耐熱層１０５ｂを有する絶縁樹脂フィルム１０５とを備えている。導体１０４は、その幅方向の断面において、絶縁樹脂フィルム１０５（の接着層１０５ａ）が貼り付けられる上面１０４ａおよび下面１０４ｂと、上面１０４ａおよび下面１０４ｂと垂直な側面１０４ｃとからなる長方形状を有している。このように断面長方形状の導体１０４を備えたリード部材１０３では、導体１０４の厚さに対して絶縁樹脂フィルム１０５の接着層１０５ａの厚さが不十分であると、図２（ａ）に示すように、導体１０４の側面１０４ｃと接着層１０５ａとの間に隙間が空いてしまい、導体の両脇を接着剤で密封することができない。 FIG. 2A is a cross-sectional view in the width direction of the lead member according to the comparative example, and FIG. 2B is a plan view of the lead member according to the comparative example.
As shown in FIGS. 2A and 2B, the lead member 103 according to the comparative example includes a conductor 104 and an insulating resin film 105 having an adhesive layer 105a and a heat-resistant layer 105b. In the cross section in the width direction, the conductor 104 has a rectangular shape including an upper surface 104a and a lower surface 104b to which the insulating resin film 105 (adhesive layer 105a) is attached, and a side surface 104c perpendicular to the upper surface 104a and the lower surface 104b. ing. In the lead member 103 including the conductor 104 having a rectangular cross section in this way, the thickness of the adhesive layer 105a of the insulating resin film 105 is insufficient with respect to the thickness of the conductor 104, as shown in FIG. As described above, a gap is left between the side surface 104c of the conductor 104 and the adhesive layer 105a, so that both sides of the conductor cannot be sealed with an adhesive.

なお、導体１０４の側面１０４ｃと接着層１０５ａとの間に隙間が空かないようにするためには、接着層１０５ａを厚くすることが考えられる。しかし、接着層１０５ａの厚さを増やし過ぎると、図２（ｂ）に示すように、絶縁樹脂フィルム１０５を導体１０４の両面から貼り合わせる際に、耐熱層１０５ｂの外側に接着層１０５ａがはみ出してしまう。このはみ出した接着層１０５ａにより、リード部材１０３と集電体（不図示）とを溶接したり、リード部材１０３と他のリード部材とを溶接したりする際に、不具合が生じるおそれがある。   In order to prevent a gap between the side surface 104c of the conductor 104 and the adhesive layer 105a, it is conceivable to increase the thickness of the adhesive layer 105a. However, if the thickness of the adhesive layer 105a is increased too much, the adhesive layer 105a protrudes outside the heat-resistant layer 105b when the insulating resin film 105 is bonded from both sides of the conductor 104, as shown in FIG. End up. Due to the protruding adhesive layer 105a, there may be a problem when the lead member 103 and the current collector (not shown) are welded or when the lead member 103 and another lead member are welded.

そこで、本出願の発明者は、上記事情を総合的に考慮して、リード部材の導体が厚くても絶縁樹脂フィルムの接着層の厚さを必要以上に増すことなく、導体と絶縁樹脂フィルムとが適切に接着可能な構成を見出した。以下に、その構成について詳述する。   Therefore, the inventor of the present application comprehensively considers the above circumstances, without increasing the thickness of the adhesive layer of the insulating resin film more than necessary, even if the conductor of the lead member is thick, the conductor and the insulating resin film Found a structure that can be properly bonded. The configuration will be described in detail below.

図３（ａ）は、絶縁樹脂フィルム５が貼り付けられる前の導体４（４’）の幅方向における一部拡大断面図であり、図３（ｂ）は、図１（ｃ）に示されるリード部材３（３’）のＩＩＩ−ＩＩＩ線断面図である。
図３（ａ）に示すように、本実施形態に係る導体４（４’）は、その幅方向断面（導体４の長さ方向に垂直な断面）において、平行部４１と、漸減部４２と、縁端部４３と、を備えている。
平行部４１は、導体４（４’）の幅方向における両端部以外の箇所であって、導体４（４’）の両面（上面と下面）が略平行となっている部分である。平行部４１の厚さＴ１は、例えば、０.１ｍｍ〜０.４ｍｍである。 Fig.3 (a) is a partial expanded sectional view in the width direction of the conductor 4 (4 ') before the insulating resin film 5 is affixed, FIG.3 (b) is shown by FIG.1 (c). It is the III-III sectional view taken on the line of lead member 3 (3 ').
As shown in FIG. 3 (a), the conductor 4 (4 ′) according to the present embodiment has a parallel section 41, a gradually decreasing section 42, and a width-direction section (a section perpendicular to the length direction of the conductor 4). The edge part 43 is provided.
The parallel portion 41 is a portion other than both end portions in the width direction of the conductor 4 (4 ′), and is a portion where both surfaces (upper surface and lower surface) of the conductor 4 (4 ′) are substantially parallel. The thickness T 1 of the parallel portions 41 is, for example, 0.1 mm to 0.4 mm.

漸減部４２は、平行部４１から幅方向の両端部に向けて導体４（４’）の厚さが漸減する部分である。漸減部４２は、平行部４１に対して４５度以下の傾きを有している、すなわち、平行部４１の延長線と漸減部４２との角度θ１が４５度以下となる。漸減部４２が平行部４１に対して４５度よりも大きい傾きを有していると、絶縁樹脂フィルム５の接着層５ａの厚さをかなり厚くしないと導体の両脇を接着層で密封することができない。 The gradually decreasing portion 42 is a portion where the thickness of the conductor 4 (4 ′) gradually decreases from the parallel portion 41 toward both end portions in the width direction. The gradually decreasing portion 42 has an inclination of 45 degrees or less with respect to the parallel portion 41, that is, the angle θ 1 between the extension line of the parallel portion 41 and the gradually decreasing portion 42 is 45 degrees or less. When the gradually decreasing portion 42 has an inclination larger than 45 degrees with respect to the parallel portion 41, both sides of the conductor are sealed with the adhesive layer unless the thickness of the adhesive layer 5a of the insulating resin film 5 is considerably increased. I can't.

導体４（４’）の幅方向における漸減部４２の長さ（幅）は１〜３ｍｍであることが好ましい。導体４（４’）の幅が３０ｍｍであれば、導体幅に対する漸減部４２の幅の割合は３．３〜１０％である。導体４（４’）の幅が１０ｍｍであれば、導体幅に対する漸減部４２の幅の割合は１〜３％である。合わせると漸減部４２の幅は導体幅の１〜１０％であることが好ましい。漸減部４２の幅が平行部４１の幅の１％よりも短いと、導体４（４’）の両面から絶縁樹脂フィルム５を貼り合わせた場合に導体４（４’）と接着層５ａとの間に隙間が空きやすくなる。漸減部４２の幅が平行部４１の幅の３％程度あれば、接着層５ａによる良好な密封封止が十分に実現可能である。漸減部４２の幅をなるべく短くすることで、導体４（４’）の断面積をできるだけ大きくすることができ、電池１の容量増大を促進させることができる。なお、図３（ａ）に示す例では、導体４（４’）の上面側（図３（ａ）の上側）の漸減部４２の傾きと下面側（図３（ａ）の下側）の漸減部４２の傾きとは同一であるが、この傾きが多少異なっていても良い。   The length (width) of the gradually decreasing portion 42 in the width direction of the conductor 4 (4 ') is preferably 1 to 3 mm. If the width of the conductor 4 (4 ') is 30 mm, the ratio of the width of the gradually decreasing portion 42 to the conductor width is 3.3 to 10%. If the width of the conductor 4 (4 ') is 10 mm, the ratio of the width of the gradually decreasing portion 42 to the conductor width is 1 to 3%. In total, the width of the gradually decreasing portion 42 is preferably 1 to 10% of the conductor width. When the width of the gradually decreasing portion 42 is shorter than 1% of the width of the parallel portion 41, the insulating resin film 5 is bonded to both sides of the conductor 4 (4 ′) and the conductor 4 (4 ′) and the adhesive layer 5a are bonded. It becomes easy to leave a gap between them. If the width of the gradually decreasing portion 42 is about 3% of the width of the parallel portion 41, good sealing and sealing with the adhesive layer 5a can be sufficiently realized. By reducing the width of the gradually decreasing portion 42 as much as possible, the cross-sectional area of the conductor 4 (4 ') can be increased as much as possible, and the increase in the capacity of the battery 1 can be promoted. In the example shown in FIG. 3A, the slope of the gradually decreasing portion 42 on the upper surface side (the upper side of FIG. 3A) and the lower surface side (the lower side of FIG. 3A) of the conductor 4 (4 ′). Although the inclination of the gradual reduction portion 42 is the same, this inclination may be slightly different.

縁端部４３は、漸減部４２よりもさらに導体４（４’）の両端部側の部分であって、本例においては、上面側の漸減部４２の端部と下面側の漸減部４２の端部とを直線的につないでいる部分である。縁端部４３は、平行部４１の延びる面と直交する傾きを有している、すなわち、平行部４１の延長線と縁端部４３との角度θ２が９０度である。縁端部４３（漸減部４２と縁端部４３との境界部分）の厚さＴ２は、平行部４１の厚さＴ１の０．４倍以上０．７倍以下である。縁端部４３の厚さＴ２が平行部４１の厚さＴ１の０．４倍よりも薄いと、漸減部４２の幅を長くする必要があり導体４（４’）の断面積が小さくなってしまう。一方、縁端部４３の厚さＴ２が平行部４１の厚さＴ１の０．４倍よりも厚いと、導体４（４’）の両面から絶縁樹脂フィルム５を貼り合わせた場合に、縁端部４３と接着層５ａとの間に隙間が空きやすくなる。 The edge portion 43 is a portion on both ends of the conductor 4 (4 ′) further than the gradually decreasing portion 42. In this example, the end portion of the gradually decreasing portion 42 on the upper surface side and the gradually decreasing portion 42 on the lower surface side are provided. It is the part which connects the end part linearly. Edge end portion 43 has an inclination perpendicular to the plane of extension of the parallel portion 41, i.e., the angle theta 2 is 90 degrees of extension and edge end portion 43 of the parallel portion 41. Edge end portion 43 the thickness T 2 of the (boundary portion between the tapering portion 42 and the edge end portion 43) is 0.7 times or less 0.4 or more times the thickness T 1 of the parallel portions 41. If the thickness T 2 of the edge end portion 43 is smaller than 0.4 times the thickness T 1 of the parallel portions 41, small cross-sectional area of the width it is necessary to lengthen the conductor 4 of the tapering portion 42 (4 ') turn into. On the other hand, if thicker than 0.4 times the thickness T 1 of the second thickness T 2 parallel portion 41 of the edge end portion 43, when the both sides of the conductor 4 (4 ') bonded to the insulating resin film 5, A gap is easily formed between the edge portion 43 and the adhesive layer 5a.

また、本例においては、導体４（４’）と各絶縁樹脂フィルム５との接触面積（ｍｍ２）を接着層５ａの厚さ（ｍｍ）で割った値が２０００（ｍｍ）以上となるように、導体４（４’）の幅と、絶縁樹脂フィルム５の長さと、接着層５ａの厚さを規定している。すなわち、導体４（４’）の幅をＤ（図１（ｃ）参照）とし、絶縁樹脂フィルム５の長さをＬ（図１（ｃ）参照）とし、接着層５ａの厚さをＴａ（図３（ｂ）参照）とした場合、式「（Ｄ×Ｌ）／Ｔａ≧２０００」を満たすことが好ましい。例えば、導体４（４’）の幅Ｄが４０ｍｍ、絶縁樹脂フィルム５の長さＬが５ｍｍである場合、接着層５ａの厚さＴａは、式「Ｔａ≦（４０×５）／２０００」から、最大でも０．１ｍｍと規定される、すなわち接着層５ａの厚さＴａは０．１ｍｍあれば十分である。 Further, in this example, the value obtained by dividing the contact area (mm 2 ) between the conductor 4 (4 ′) and each insulating resin film 5 by the thickness (mm) of the adhesive layer 5a is 2000 (mm) or more. In addition, the width of the conductor 4 (4 ′), the length of the insulating resin film 5, and the thickness of the adhesive layer 5a are defined. That is, the width of the conductor 4 (4 ′) is D (see FIG. 1C), the length of the insulating resin film 5 is L (see FIG. 1C), and the thickness of the adhesive layer 5a is T a. In the case of (see FIG. 3B), it is preferable to satisfy the formula “(D × L) / T a ≧ 2000”. For example, if the width D of the conductor 4 (4 ') is 40 mm, the length L is 5mm insulating resin film 5, the thickness T a of the adhesive layer 5a have the formula "T a ≦ (40 × 5) / 2000 from ", 0.1 mm to be defined at the most, that is, the thickness T a of the adhesive layer 5a is a sufficient 0.1 mm.

なお、導体４（４’）の漸減部４２を形成する際には、導体４（４’）を圧延して形成する方法の他、導体４（４’）をテーパ状の鋳型に入れてから押出したり、導体４（４’）の端部を切削したりする方法を用いることができる。   In addition, when forming the gradually decreasing portion 42 of the conductor 4 (4 ′), in addition to a method of rolling the conductor 4 (4 ′), the conductor 4 (4 ′) is placed in a tapered mold. A method of extruding or cutting an end of the conductor 4 (4 ′) can be used.

導体４（４’）は表面処理して絶縁フィルムとの密着を向上させるのが好ましい。導体４（４’）がアルミニウムの場合は、酸化被膜層を形成すること（例えば、ベーマイト処理）や、有機酸を含む樹脂と金属塩の複合被膜層を形成するのが好ましい。導体４（４’）が銅（メッキされた銅を含む）の場合は、有機酸を含む樹脂と金属塩の複合被膜を形成するのが好ましい。被膜層は、導体４（４’）の表面全体に形成してもよいが、特に漸減部４２と縁端部４３の表面に形成することが好ましい。   The conductor 4 (4 ') is preferably surface-treated to improve adhesion with the insulating film. When the conductor 4 (4 ') is aluminum, it is preferable to form an oxide film layer (for example, boehmite treatment) or to form a composite film layer of a resin containing an organic acid and a metal salt. When the conductor 4 (4 ') is copper (including plated copper), it is preferable to form a composite film of a resin containing an organic acid and a metal salt. The coating layer may be formed on the entire surface of the conductor 4 (4 ′), but it is particularly preferable to form the coating layer on the surfaces of the gradually decreasing portion 42 and the edge portion 43.

導体４（４’）の幅方向の端部をテーパ形状にする（導体端部に向けて厚さが漸減する漸減部４２を形成する）場合は、当該端部をテーパ形状にした後に導体４（４’）を表面処理するのが好ましい。端部をテーパ形状にする加工（テーパ加工）により導体４（４’）の表面が削られることがあるが、テーパ加工後に表面処理すると、全面が表面処理された導体４（４’）を確実に得られる。特に、導体４（４’）をテーパ状の鋳型に入れてから押出す場合や、導体４（４’）の端部を切削する場合は、それらの加工後に導体４（４’）を表面処理するのが好ましい。導体４（４’）の幅方向端部をテーパ形状に加工することと導体４（４’）の表面処理とが相乗効果を奏して、導体４（４’）の幅方向端部で導体４（４’）と絶縁樹脂フィルム５とが強固に密着し、かつ隙間が生じない。したがって、電池１内部の電解液が漏れることがない。   When the end portion in the width direction of the conductor 4 (4 ′) is tapered (the gradually decreasing portion 42 whose thickness gradually decreases toward the conductor end portion is formed), the conductor 4 is formed after the end portion is tapered. (4 ′) is preferably surface-treated. The surface of the conductor 4 (4 ′) may be scraped by processing the end to be tapered (taper processing). However, if the surface treatment is performed after the taper processing, the conductor 4 (4 ′) whose entire surface has been surface treated is ensured. Is obtained. In particular, when the conductor 4 (4 ′) is extruded after being put into a tapered mold, or when the end of the conductor 4 (4 ′) is cut, the conductor 4 (4 ′) is subjected to a surface treatment after the processing. It is preferable to do this. Processing the end portion in the width direction of the conductor 4 (4 ′) into a tapered shape and the surface treatment of the conductor 4 (4 ′) have a synergistic effect, and the conductor 4 at the end portion in the width direction of the conductor 4 (4 ′). (4 ′) and the insulating resin film 5 are firmly adhered to each other and no gap is generated. Therefore, the electrolytic solution inside the battery 1 does not leak.

導体４（４’）は、焼きなまししたものが好ましい。例えば、導体４（４’）は、ＩＳＯ２１０７：２００７に定められる質別記号がＯであるもの（Ｏ材）が好ましい。Ｏ材を使用することで、リード部材３（３’）を電池内外の他の金属部材に溶接する場合に、不良とならない。Ｏ材を使用することで、リード部材３（３’）を電池外で折り曲げた場合にリード部材が折れ曲がり部で破断することがない。   The conductor 4 (4 ') is preferably annealed. For example, the conductor 4 (4 ') is preferably a conductor whose material classification symbol defined in ISO 2107: 2007 is O (O material). By using the O material, when the lead member 3 (3 ') is welded to other metal members inside and outside the battery, it does not become defective. By using the O material, when the lead member 3 (3 ') is bent outside the battery, the lead member is not bent and broken at the bent portion.

導体４（４’）の幅方向端部のテーパ加工により、その部分の導体（金属）が圧縮されて硬度が大きくなると、導体抵抗が増して好ましくない。そのため、導体４（４’）は、圧縮せずに切削するか、圧延加工した後に焼きなまして、テーパ加工された部分（漸減部４２）の硬度をテーパ加工されていない部分（平行部４１）と同等（例えば漸減部４２と平行部４１との硬度差が１５％以内）にするのが好ましい。導体４（４’）にＯ材を使用した場合は、切削するだけの場合にも焼きなまし効果があり、また、導体４（４’）の圧延後に焼きなました場合にも焼きなまし効果が大きい。   If the conductor (metal) at the end of the conductor 4 (4 ') in the width direction is compressed and the hardness of the conductor (metal) is increased, the conductor resistance is increased, which is not preferable. Therefore, the conductor 4 (4 ′) is cut without being compressed, or annealed after being rolled, and the hardness of the tapered portion (gradual decreasing portion 42) is not tapered (the parallel portion 41). It is preferable to make them equal (for example, the hardness difference between the gradually decreasing portion 42 and the parallel portion 41 is within 15%). When the O material is used for the conductor 4 (4 '), there is an annealing effect even when only the cutting is performed, and also when the conductor 4 (4') is annealed after rolling, the annealing effect is great.

以上説明したように、本実施形態に係るリード部材３（３’）において、導体４（４’）は、その長さ方向に垂直な断面において、幅方向の両端部以外の箇所であって導体４（４’）の両面が平行となっている平行部４１と、平行部４１から幅方向の両端部に向けて厚さが漸減する漸減部４２と、漸減部４２よりもさらに幅方向の両端部側に設けられた縁端部４３と、を備えている。漸減部４２は、平行部４１に対して４５度以下の傾きを有する一方、縁端部４３は平行部４１に対して９０度の傾きを有している。そして、導体４（４’）は、平行部４１の厚さＴ１が絶縁樹脂フィルム５の接着層５ａの厚さＴａの４倍以上１０倍以下であり、縁端部４３の厚さＴ２は平行部４１の厚さＴ１の０．４倍以上０．７倍以下であり、片面側の絶縁樹脂フィルム５と導体４（４’）との接触面積（ｍｍ２）を接着層５ａの厚さＴａ（ｍｍ）で割った値が２０００（ｍｍ）以上であるように構成されている。このような構成により、絶縁樹脂フィルム５の接着層５ａの厚さを必要以上に増すことなく、導体４（４’）と絶縁樹脂フィルム５とを隙間なく適切に接着することが可能となる。 As described above, in the lead member 3 (3 ′) according to the present embodiment, the conductor 4 (4 ′) is a portion other than both end portions in the width direction in the cross section perpendicular to the length direction. 4 (4 ') both sides of the parallel part 41, the gradually decreasing part 42 whose thickness gradually decreases from the parallel part 41 toward both ends in the width direction, and both ends in the width direction further than the gradually decreasing part 42 And an edge portion 43 provided on the portion side. The gradual reduction part 42 has an inclination of 45 degrees or less with respect to the parallel part 41, while the edge part 43 has an inclination of 90 degrees with respect to the parallel part 41. Then, the conductor 4 (4 ') is the thickness T 1 of the parallel portions 41 is less than 10 times more than four times the thickness T a of the adhesive layer 5a of the insulating resin film 5, the thickness T of the edge end portion 43 2 is not less than 0.4 times and not more than 0.7 times the thickness T 1 of the parallel portion 41, and the contact area (mm 2 ) between the insulating resin film 5 on one side and the conductor 4 (4 ′) is determined as the adhesive layer 5a. The thickness divided by the thickness T a (mm) is 2000 (mm) or more. With such a configuration, the conductor 4 (4 ′) and the insulating resin film 5 can be appropriately bonded without a gap without increasing the thickness of the adhesive layer 5a of the insulating resin film 5 more than necessary.

（変形例１）
図４（ａ）は、変形例１に係るリード部材の導体の一部拡大断面図である。
図４（ａ）に示すように、変形例１に係る導体４Ａは、平行部４１Ａと、漸減部４２Ａと、縁端部４３Ａと、を備えている。変形例１においては、漸減部４２Ａは、平行部４１Ｂから幅方向の各端部に向けて導体４Ａの厚さが漸減する略円弧形状の部分であって、平行部４１Ａに対して４５度以下の傾きを有している。そして、平行部４１Ａの延長線に対して４５度の角度θＡを有する接線と交差する部分から導体４Ａの端部側を縁端部４３Ａとする。縁端部４３Ａは、上面側の漸減部４２Ａと下面側の漸減部４２Ａとの間で略円弧形状に形成されている。縁端部４３Ａは、平行部４１Ａに対して４５度以上の傾きを有している。漸減部４２Ａと縁端部４３Ａの境界部分の厚さＴＡは、平行部４１Ａの厚さＴ１の０．４倍以上０．７倍以下となるように規定されている。このような構成とすることで、変形例１に係る導体４Ａを備えたリード部材においても、絶縁樹脂フィルム５の接着層５ａの厚さを必要以上に増すことなく導体４Ａと絶縁樹脂フィルム５とを隙間なく適切に接着することができる。 (Modification 1)
FIG. 4A is a partially enlarged cross-sectional view of the conductor of the lead member according to the first modification.
As shown in FIG. 4A, the conductor 4A according to Modification 1 includes a parallel part 41A, a gradually decreasing part 42A, and an edge part 43A. In Modification 1, the gradually decreasing portion 42A is a substantially arc-shaped portion in which the thickness of the conductor 4A gradually decreases from the parallel portion 41B toward each end in the width direction, and is 45 degrees or less with respect to the parallel portion 41A. Has a slope of. Then, the edge end portion 43A of the end of the conductor 4A from the portion intersecting the tangent line having an angle theta A of 45 degrees with respect to the extension line of the parallel portion 41A. The edge portion 43A is formed in a substantially arc shape between the gradually decreasing portion 42A on the upper surface side and the gradually decreasing portion 42A on the lower surface side. The edge part 43A has an inclination of 45 degrees or more with respect to the parallel part 41A. The thickness T A of the boundary portion of the tapering portion 42A and the edge end portion 43A is defined to be equal to or less than 0.7 times 0.4 times or more the thickness T 1 of the parallel portion 41A. By adopting such a configuration, even in the lead member including the conductor 4A according to the modification 1, the conductor 4A and the insulating resin film 5 can be used without increasing the thickness of the adhesive layer 5a of the insulating resin film 5 more than necessary. Can be properly bonded without gaps.

（変形例２）
図４（ｂ）は、変形例２に係るリード部材の導体の一部拡大断面図である。
図４（ｂ）に示すように、変形例２に係る導体４Ｂは、平行部４１Ｂと、漸減部４２Ｂと、縁端部４３Ｂと、を備えている。漸減部４２Ｂは、平行部４１Ｂから幅方向の各端部に向けて導体４Ａの厚さが漸減する直線状の部分であり、平行部４１Ｂに対して４５度以下の傾きを有している。縁端部４３Ｂは、漸減部４２Ｂよりも導体４Ｂの両端部側の部分であって、上面側の漸減部４２Ｂと下面側の漸減部４２Ｂとの間で略円弧形状に形成されている。縁端部４３Ｂは、平行部４１Ｂに対して４５度以上の傾きを有している。漸減部４２Ｂと縁端部４３Ｂとの境界部分の厚さＴＢは、平行部４１Ｂの厚さＴ１の０．４倍以上０．７倍以下となるように規定されている。このような構成とすることで、変形例２に係る導体４Ｂを備えたリード部材においても、絶縁樹脂フィルム５の接着層５ａの厚さを必要以上に増すことなく導体４Ｂと絶縁樹脂フィルム５とを隙間なく適切に接着することができる。 (Modification 2)
FIG. 4B is a partially enlarged cross-sectional view of the conductor of the lead member according to the second modification.
As shown in FIG. 4B, the conductor 4B according to Modification 2 includes a parallel part 41B, a gradually decreasing part 42B, and an edge part 43B. The gradually decreasing portion 42B is a linear portion where the thickness of the conductor 4A gradually decreases from the parallel portion 41B toward each end in the width direction, and has an inclination of 45 degrees or less with respect to the parallel portion 41B. The edge portion 43B is a portion closer to both ends of the conductor 4B than the gradually decreasing portion 42B, and is formed in a substantially arc shape between the gradually decreasing portion 42B on the upper surface side and the gradually decreasing portion 42B on the lower surface side. The edge part 43B has an inclination of 45 degrees or more with respect to the parallel part 41B. The thickness T B of the boundary between the tapering portion 42B and the edge end portion 43B is defined to be equal to or less than 0.7 times 0.4 times or more the thickness T 1 of the parallel portion 41B. By adopting such a configuration, even in the lead member including the conductor 4B according to the modified example 2, the conductor 4B and the insulating resin film 5 can be used without increasing the thickness of the adhesive layer 5a of the insulating resin film 5 more than necessary. Can be properly bonded without gaps.

（変形例３）
図４（ｃ）は、変形例３に係るリード部材の導体の一部拡大断面図である。
図４（ｃ）に示すように、変形例３に係る導体４Ｃは、平行部４１Ｃと、漸減部４２Ｃと、縁端部４３Ｃと、を備えている。漸減部４２Ｃは、平行部４１Ｃから幅方向の両端部に向けて導体４Ｃの厚さが漸減する直線状の部分であり、平行部４１Ｃに対して４５度以下の傾きを有している。縁端部４３Ｃは、漸減部４２Ｃよりも導体４Ｃの両端部側の部分であって、漸減部４２Ｃよりも平行部４１Ｃに対する傾きが大きい第一縁端部４３Ｃ１と、上面側の第一縁端部４３Ｃ１と下面側の第一縁端部４３Ｃ１との間を直線的につなぐ第二縁端部４３Ｃ２とを有している。第一縁端部４３Ｃ１は、平行部４１Ｃに対して４５度以上の傾きを有しており、第二縁端部４３Ｃ２は、平行部４１Ｃに対して９０度の傾きを有している。漸減部４２Ｃと第一縁端部４３Ｃ１との境界部分の厚さＴｃは、平行部４１Ｃの厚さＴ１の０．４倍以上０．７倍以下となるように規定されている。このような構成とすることで、変形例３に係る導体４Ｃを備えたリード部材においても、絶縁樹脂フィルム５の接着層５ａの厚さを必要以上に増すことなく導体４Ｃと絶縁樹脂フィルム５とを隙間なく適切に接着することができる。 (Modification 3)
FIG. 4C is a partially enlarged cross-sectional view of the conductor of the lead member according to the third modification.
As shown in FIG. 4C, the conductor 4C according to the modification 3 includes a parallel part 41C, a gradually decreasing part 42C, and an edge part 43C. The gradually decreasing portion 42C is a linear portion in which the thickness of the conductor 4C gradually decreases from the parallel portion 41C toward both ends in the width direction, and has an inclination of 45 degrees or less with respect to the parallel portion 41C. The edge portion 43C is a portion closer to both ends of the conductor 4C than the gradually decreasing portion 42C, and has a first edge portion 43C1 having a larger inclination with respect to the parallel portion 41C than the gradually decreasing portion 42C, and a first edge on the upper surface side. A second edge portion 43C2 that linearly connects the portion 43C1 and the first edge portion 43C1 on the lower surface side. The first edge part 43C1 has an inclination of 45 degrees or more with respect to the parallel part 41C, and the second edge part 43C2 has an inclination of 90 degrees with respect to the parallel part 41C. The thickness T c of the tapering portion 42C and the boundary between the first edge portion 43C1 is defined to be equal to or less than 0.7 times 0.4 times or more the thickness T 1 of the parallel portion 41C. By adopting such a configuration, even in the lead member including the conductor 4C according to the modification 3, the conductor 4C and the insulating resin film 5 can be used without increasing the thickness of the adhesive layer 5a of the insulating resin film 5 more than necessary. Can be properly bonded without gaps.

（変形例４）
図４（ｄ）は、変形例４に係るリード部材の導体の一部拡大断面図である。
図４（ｄ）に示すように、変形例４に係る導体４Ｄは、平行部４１Ｄと、漸減部４２Ｄと、縁端部４３Ｄと、を備えている。漸減部４２Ｄは、上面側の平行部４１Ｃから幅方向の各端部に向けて導体４Ｄの厚さが漸減する直線状の部分であり、平行部４１Ｄに対して４５度以下の傾きを有している。すなわち、変形例４にかかる導体４Ｄでは、漸減部４２Ｄは片面側のみに設けられている。縁端部４３Ｄは、漸減部４２Ｄの端部と下面側の平行部４１Ｄの端部との間を直線的につなぐ部分であって、平行部４１Ｄに対して９０度の傾きを有している。漸減部４２Ｄと縁端部４３Ｄとの境界部分（すなわち、漸減部４２Ｄの端部と下面側の平行部４１Ｄの端部との間）の厚さＴDは、上面側の平行部４１Ｄと下面側の平行部４１Ｄとの間の厚さＴ１の０．４倍以上０．７倍以下となるように規定されている。このような構成とすることで、変形例４に係る導体４Ｄを備えたリード部材においても、絶縁樹脂フィルム５の接着層５ａの厚さを必要以上に増すことなく導体４Ｄと絶縁樹脂フィルム５とを隙間なく適切に接着することができる。 (Modification 4)
FIG. 4D is a partially enlarged cross-sectional view of the conductor of the lead member according to Modification 4.
As shown in FIG. 4D, the conductor 4D according to the modification 4 includes a parallel part 41D, a gradually decreasing part 42D, and an edge part 43D. The gradually decreasing portion 42D is a linear portion where the thickness of the conductor 4D gradually decreases from the parallel portion 41C on the upper surface side toward each end in the width direction, and has an inclination of 45 degrees or less with respect to the parallel portion 41D. ing. That is, in the conductor 4D according to the modified example 4, the gradually decreasing portion 42D is provided only on one side. The edge portion 43D is a portion that linearly connects between the end portion of the gradually decreasing portion 42D and the end portion of the parallel portion 41D on the lower surface side, and has an inclination of 90 degrees with respect to the parallel portion 41D. . Boundary between the tapering portion 42D and the edge end portion 43D (i.e., between the end of the parallel portion 41D of the end portion and the lower surface of the tapering portion 42D) thickness T D of the parallel portion 41D and the lower surface of the upper surface It is defined to be equal to or less than 0.7 times 0.4 times or more the thickness T 1 of between parallel portion 41D side. By adopting such a configuration, even in the lead member including the conductor 4D according to the modification 4, the conductor 4D and the insulating resin film 5 can be used without increasing the thickness of the adhesive layer 5a of the insulating resin film 5 more than necessary. Can be properly bonded without gaps.

以上、本発明を詳細にまた特定の実施態様を参照して説明したが、本発明の精神と範囲を逸脱することなく様々な変更や修正を加えることができることは当業者にとって明らかである。また、上記説明した構成部材の数、位置、形状等は上記実施の形態に限定されず、本発明を実施する上で好適な数、位置、形状等に変更することができる。   While the invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention. In addition, the number, position, shape, and the like of the constituent members described above are not limited to the above-described embodiments, and can be changed to a number, position, shape, and the like that are suitable for carrying out the present invention.

１：電池
２：封入体
２ａ：最内層フィルム
２ｂ：金属箔層
２ｃ：最外層フィルム
３：正極側のリード部材
３’：負極側のリード部材
４，４’，４Ａ，４Ｂ，４Ｃ，４Ｄ：導体
４ａ：上端部
４ｂ：下端部
５：絶縁樹脂フィルム
５ａ：接着層
５ｂ：耐熱層
６：シール部
７：電極板リード
４１：平行部
４２：漸減部
４３：縁端部 1: Battery 2: Enclosure 2a: Innermost layer film 2b: Metal foil layer 2c: Outermost layer film 3: Positive electrode side lead member 3 ′: Negative electrode side lead member 4, 4 ′, 4A, 4B, 4C, 4D: Conductor 4a: upper end portion 4b: lower end portion 5: insulating resin film 5a: adhesive layer 5b: heat-resistant layer 6: seal portion 7: electrode plate lead 41: parallel portion 42: gradually decreasing portion 43: edge portion

Claims (6)

金属箔からなる導体の両面から前記導体の長さ方向の両端部以外の箇所に一対の絶縁樹脂フィルムが貼り合わされたリード部材であって、
前記一対の絶縁樹脂フィルムは、前記導体と接する側に接着層を備えるとともに、前記導体の前記長さ方向に直交する幅方向において前記導体の外方にはみ出るように配置されて、前記導体の外方にはみ出した部分の前記接着層が互いに貼り合わされ、
前記導体は、前記幅方向に沿った断面において、
前記幅方向の両端部以外の箇所であって前記導体の両面が平行となっている平行部と、
前記平行部から前記幅方向の前記両端部に向けて厚さが漸減する漸減部と、
前記漸減部よりもさらに前記幅方向の前記両端部側に設けられた縁端部と、
を備え、
前記漸減部は前記平行部に対して４５度以下の傾きを有する一方、前記縁端部は前記平行部に対して４５度以上の傾きを有し、
前記平行部の厚さが前記接着層の厚さの４倍以上１０倍以下であり、
前記漸減部と前記縁端部との境界部分の厚さが前記平行部の厚さの０．４倍以上０．７倍以下であり、
前記一対の絶縁樹脂フィルムのいずれかと前記導体との接触面積（ｍｍ２）を前記接着層の厚さ（ｍｍ）で割った値が２０００（ｍｍ）以上である、リード部材。 It is a lead member in which a pair of insulating resin films are bonded to locations other than both ends in the length direction of the conductor from both sides of a conductor made of metal foil,
The pair of insulating resin films includes an adhesive layer on a side in contact with the conductor, and is disposed so as to protrude outward from the conductor in a width direction orthogonal to the length direction of the conductor. The adhesive layers of the protruding part are stuck together,
In the cross section along the width direction, the conductor,
A parallel part where both sides of the conductor are parallel to each other at both ends in the width direction;
A gradually decreasing portion in which the thickness gradually decreases from the parallel portion toward the both end portions in the width direction;
Edge portions provided on the both end sides in the width direction further than the gradually decreasing portion; and
With
The gradually decreasing part has an inclination of 45 degrees or less with respect to the parallel part, while the edge part has an inclination of 45 degrees or more with respect to the parallel part,
The parallel part has a thickness of 4 to 10 times the thickness of the adhesive layer,
The thickness of the boundary portion between the gradually decreasing portion and the edge portion is not less than 0.4 times and not more than 0.7 times the thickness of the parallel portion,
A lead member, wherein a value obtained by dividing a contact area (mm 2 ) between one of the pair of insulating resin films and the conductor by a thickness (mm) of the adhesive layer is 2000 (mm) or more. 前記幅方向に沿った前記漸減部の幅は、前記導体の幅の１〜１０％である、請求項１に記載のリード部材。   The lead member according to claim 1, wherein a width of the gradually decreasing portion along the width direction is 1 to 10% of a width of the conductor. 前記漸減部および前記縁端部の表面に有機酸を含む樹脂と金属塩の複合皮膜層が形成されていて、前記複合皮膜層が前記接着層に密着している、請求項１または請求項２に記載のリード部材。   The composite film layer of resin and metal salt containing an organic acid is formed on the surface of the gradually decreasing portion and the edge portion, and the composite film layer is in close contact with the adhesive layer. The lead member according to 1. 前記導体は、質別記号がＯであるものである、請求項１から請求項３のいずれか一項に記載のリード部材。   The lead member according to any one of claims 1 to 3, wherein the conductor has a classification symbol of O. 前記導体は、前記平行部の硬度と前記漸減部の硬度とが同等である、請求項１から請求項４のいずれか一項に記載のリード部材。   The lead member according to any one of claims 1 to 4, wherein the conductor has a hardness of the parallel portion and a hardness of the gradually decreasing portion. 請求項１から請求項５のいずれか一項に記載のリード部材を有する電池であって、
発電素子が包材内に収容され、
前記リード部材が前記発電素子の電極と接続され、
前記リード部材と前記一対の絶縁樹脂フィルムの長さ方向の一端が前記包材の外側に配置されている、電池。 A battery having the lead member according to any one of claims 1 to 5,
The power generation element is contained in the packaging material,
The lead member is connected to an electrode of the power generation element;
One end in the length direction of the lead member and the pair of insulating resin films is disposed outside the packaging material.
JP2015253412A 2015-12-25 2015-12-25 Lead member and battery employing the lead member Pending JP2017117705A (en)

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