JP2001297748A - Nonaqueous electrolyte secondary battery - Google Patents
Nonaqueous electrolyte secondary batteryInfo
- Publication number
- JP2001297748A JP2001297748A JP2000114886A JP2000114886A JP2001297748A JP 2001297748 A JP2001297748 A JP 2001297748A JP 2000114886 A JP2000114886 A JP 2000114886A JP 2000114886 A JP2000114886 A JP 2000114886A JP 2001297748 A JP2001297748 A JP 2001297748A
- Authority
- JP
- Japan
- Prior art keywords
- resin layer
- lead
- melting point
- secondary battery
- outer case
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000011255 nonaqueous electrolyte Substances 0.000 title claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 38
- 239000011347 resin Substances 0.000 claims abstract description 38
- 239000004840 adhesive resin Substances 0.000 claims abstract description 25
- 229920006223 adhesive resin Polymers 0.000 claims abstract description 25
- 238000002844 melting Methods 0.000 claims description 33
- 230000008018 melting Effects 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 24
- 239000002184 metal Substances 0.000 claims description 24
- 239000003792 electrolyte Substances 0.000 claims description 7
- 229920005672 polyolefin resin Polymers 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000002075 main ingredient Substances 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 51
- 239000011888 foil Substances 0.000 description 18
- 239000007788 liquid Substances 0.000 description 9
- 230000002265 prevention Effects 0.000 description 8
- 239000004743 Polypropylene Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 7
- -1 polypropylene Polymers 0.000 description 7
- 229920001155 polypropylene Polymers 0.000 description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 229920013716 polyethylene resin Polymers 0.000 description 5
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000003960 organic solvent Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 230000003405 preventing effect Effects 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 239000011149 active material Substances 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 229910021469 graphitizable carbon Inorganic materials 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 3
- 229920005606 polypropylene copolymer Polymers 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- BQCIDUSAKPWEOX-UHFFFAOYSA-N 1,1-Difluoroethene Chemical compound FC(F)=C BQCIDUSAKPWEOX-UHFFFAOYSA-N 0.000 description 2
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- HCDGVLDPFQMKDK-UHFFFAOYSA-N hexafluoropropylene Chemical group FC(F)=C(F)C(F)(F)F HCDGVLDPFQMKDK-UHFFFAOYSA-N 0.000 description 2
- 238000004898 kneading Methods 0.000 description 2
- VZCYOOQTPOCHFL-UPHRSURJSA-N maleic acid Chemical compound OC(=O)\C=C/C(O)=O VZCYOOQTPOCHFL-UPHRSURJSA-N 0.000 description 2
- 239000011976 maleic acid Substances 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- KMTRUDSVKNLOMY-UHFFFAOYSA-N Ethylene carbonate Chemical compound O=C1OCCO1 KMTRUDSVKNLOMY-UHFFFAOYSA-N 0.000 description 1
- 229910015118 LiMO Inorganic materials 0.000 description 1
- 229910013870 LiPF 6 Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 102100031083 Uteroglobin Human genes 0.000 description 1
- 108090000203 Uteroglobin Proteins 0.000 description 1
- 239000006230 acetylene black Substances 0.000 description 1
- 238000010306 acid treatment Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- 239000005001 laminate film Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052723 transition metal Inorganic materials 0.000 description 1
- 150000003624 transition metals Chemical class 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、薄い樹脂フィルム
主体のラミネートシートで袋状外装ケースを構成し、こ
れで扁平な電池要素を包みこんだ非水電解質二次電池に
関するもので、さらに詳しくは、気密、液密性と短絡防
止機能に優れたリードを用いた非水電解質二次電池に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-aqueous electrolyte secondary battery in which a bag-shaped outer case is formed of a laminate sheet mainly composed of a thin resin film, and which wraps a flat battery element. The present invention relates to a non-aqueous electrolyte secondary battery using a lead excellent in airtightness, liquid tightness and short-circuit prevention function.
【０００２】[0002]
【従来の技術】近年、ノートパソコン、携帯電話等のコ
ードレス機器が普及するに伴い、それらの電源として、
より小型で高エネルギー密度を有し、繰り返し充放電が
可能である高性能のリチウムイオン二次電池が要望され
るようになってきた。2. Description of the Related Art In recent years, as cordless devices such as notebook personal computers and mobile phones have become widespread, their power sources are:
There has been a demand for a high-performance lithium ion secondary battery that is smaller, has a higher energy density, and can be repeatedly charged and discharged.
【０００３】このようなリチウムイオン二次電池として
は、ＬｉＭＯ2（ＭはＣｏ、Ｍｎ、Ｎｉ等の遷移金属）
を活物質とした正極とリチウムを吸蔵、放出できる易黒
鉛化炭素を活物質とした負極板をセパレータを介して構
成される電池要素を非水電解液と共に金属ケースに収納
したものが知られている。As such a lithium ion secondary battery, LiMO 2 (M is a transition metal such as Co, Mn and Ni) is used.
It is known that a battery element composed of a positive electrode made of an active material and a negative electrode plate made of graphitizable carbon that can occlude and release lithium as an active material via a separator is housed in a metal case together with a non-aqueous electrolyte. I have.
【０００４】また、これらを用いた機器の小型化、薄型
化が進むに従い、円筒型よりも体積効率が高く、薄型化
が可能な角型リチウムイオン電池の需要が増加している
が、特開平３−６２４４７号公報に開示されているよう
に、更なる電池の薄型化のために、外装ケースに従来の
金属ケースに代わり、電池要素に接する内側から樹脂接
着層、金属箔層、樹脂表面層からなる、いわゆる金属箔
を樹脂層で挟みこみ積層一体化したラミネートフィルム
を使用する方法が開示されている。In addition, as devices using these devices have become smaller and thinner, there has been an increasing demand for prismatic lithium-ion batteries which have higher volumetric efficiency than cylindrical types and can be made thinner. As disclosed in Japanese Patent Application Laid-Open No. 3-62447, in order to further reduce the thickness of the battery, a resin adhesive layer, a metal foil layer, and a resin surface layer are provided from the inside in contact with the battery element instead of the conventional metal case as the outer case. A method of using a laminated film composed of a so-called metal foil sandwiched between resin layers and laminated and integrated is disclosed.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、ラミネ
ートフィルムを電池の外装ケースとして使用する場合、
極板群と外装ケースを直接導通させ、ケース自体を電極
として使用する従来のアルミニウム製ケースと異なり、
構造上、外装ケースを外部接続端子とすることが困難で
あり、極板群からそれぞれアルミニウム、銅、ニッケル
等の金属製のリード端子を電池外部に取り出す方法が採
用されているが、熱溶着時にリード端子と金属箔層とが
短絡するといった課題があった。However, when a laminate film is used as an outer case of a battery,
Unlike the conventional aluminum case that directly connects the electrode group and the outer case and uses the case itself as an electrode,
Due to its structure, it is difficult to use the outer case as an external connection terminal, and a method of taking out metal lead terminals of aluminum, copper, nickel, etc. from the electrode plate group to the outside of the battery has been adopted. There was a problem that the lead terminal and the metal foil layer were short-circuited.
【０００６】このリード端子と金属箔層との短絡を防止
する方法として、外装ケースのシール部と接するリード
表面を絶縁処理する方法が、特開平１０−２８９６９６
号公報に開示されているが、リード端子と外装ケースの
金属箔層との短絡防止機能と、リード端子と外装ケース
内面との気密性、液密性が不十分である。As a method of preventing a short circuit between the lead terminal and the metal foil layer, a method of insulating the surface of the lead in contact with the seal portion of the outer case is disclosed in Japanese Patent Laid-Open No. Hei 10-289696.
Although it is disclosed in Japanese Patent Application Laid-Open Publication No. H10-284, the function of preventing a short circuit between the lead terminal and the metal foil layer of the outer case and the airtightness and liquid tightness between the lead terminal and the inner surface of the outer case are insufficient.
【０００７】本発明は、気密、液密性と短絡防止機能に
優れたリードを用いた非水電解質二次電池を提供するこ
とを主たる目的とする。An object of the present invention is to provide a non-aqueous electrolyte secondary battery using a lead having excellent airtightness, liquid tightness and short-circuit prevention function.
【０００８】[0008]
【課題を解決するための手段】上記の課題を解決するた
めの本発明は、それぞれシート状またはフィルム状の正
極板、電解質を保持するセパレータおよび負極板を積層
した扁平な電池要素を、樹脂フィルム主体のラミネート
シートで形成された袋状外装ケース内に収納するととも
に、前記正極板および負極板にそれぞれ一端が接続され
た正極リード及び負極リードを、前記外装ケースのシー
ル部より外部に引き出した電池において、少なくとも前
記外装ケースのシール部と接するリード表面が金属接着
性樹脂層、高融点樹脂層、低融点接着性樹脂層を順に積
層一体化されたリードを用いることにより、気密、液密
性と短絡防止機能に優れた非水電解質二次電池を提供す
るものである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a flat battery element comprising a sheet-like or film-like positive electrode plate, a separator holding an electrolyte, and a negative electrode plate laminated on a resin film. A battery that is housed in a bag-shaped outer case formed of a main laminate sheet, and has a positive electrode lead and a negative electrode lead, one ends of which are connected to the positive electrode plate and the negative electrode plate, respectively, drawn out of a sealing portion of the outer case. In, at least the surface of the lead in contact with the sealing portion of the outer case is a metal adhesive resin layer, a high melting point resin layer, by using a lead in which a low melting point adhesive resin layer is sequentially laminated and integrated, air tightness, liquid tightness and An object of the present invention is to provide a non-aqueous electrolyte secondary battery having an excellent short-circuit prevention function.
【０００９】[0009]
【発明の実施の形態】以下、本発明の実施の形態につい
て図面を参照しながら説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１０】図１および図２は本発明の非水電解質二次
電池の上面図および断面図である。正極１は正極活物質
と導電剤および結着剤兼電解液保持剤としてのポリマー
を有機溶媒に混練分散したペーストをＡｌ箔製集電体２
の両面に塗着、乾燥、圧延し、正極合剤層３としたもの
である。この２枚の正極の間に、前記ポリマーからなる
セパレ−タ９を介してリチウムを吸蔵、放出できる易黒
鉛化炭素と前記結着剤兼電解液保持剤としてのポリマー
を有機溶媒に混練分散したペーストをＣｕ箔製集電体６
に塗着、乾燥、圧延し、負極合剤層７を形成した負極５
を配設し、全体が図２に示すように積層されて電池要素
１０が構成される。４は正極の集電部に設けたリード取
り付け部であり、ここには正極リード１１が溶接されて
いる。８は負極の集電部に設けたリード取り付け部であ
り、ここには負極リード１２が溶接されている。FIGS. 1 and 2 are a top view and a sectional view of a non-aqueous electrolyte secondary battery of the present invention. The positive electrode 1 is made of a paste obtained by kneading and dispersing a positive electrode active material, a polymer as a conductive agent and a binder and an electrolyte retainer in an organic solvent, and forming a collector 2 made of Al foil.
, Dried, and rolled to form a positive electrode mixture layer 3. Between the two positive electrodes, a graphitizable carbon capable of inserting and extracting lithium through a separator 9 made of the polymer and a polymer as a binder and an electrolyte retainer were kneaded and dispersed in an organic solvent. Paste Cu foil current collector 6
, Dried and rolled to form a negative electrode mixture layer 7 on the negative electrode 5
And the whole is stacked as shown in FIG. 2 to form the battery element 10. Reference numeral 4 denotes a lead mounting portion provided on the current collecting portion of the positive electrode, to which a positive electrode lead 11 is welded. Reference numeral 8 denotes a lead mounting portion provided on a current collecting portion of the negative electrode, to which a negative electrode lead 12 is welded.
【００１１】図３は本発明の正極リード１１、負極リー
ド１２の詳細断面図である。２３、２４はそれぞれＡｌ
箔、Ｃｕ箔で、２０、２１、２２はその両外側に順に配
設された金属接着性樹脂層、高融点樹脂層、低融点接着
性樹脂層であり、これらは積層一体化されている。FIG. 3 is a detailed sectional view of the positive electrode lead 11 and the negative electrode lead 12 of the present invention. 23 and 24 are Al
A foil, a Cu foil, and reference numerals 20, 21 and 22 denote a metal adhesive resin layer, a high melting point resin layer, and a low melting point adhesive resin layer which are sequentially disposed on both outer sides thereof, and these are laminated and integrated.
【００１２】金属接着性樹脂層２０は、Ａｌ箔２３及び
Ｃｕ箔２４との密着性が要求されるために、厚みが２〜
１５μｍの酸変性処理、特にマレイン酸処理されたオレ
フィン樹脂が好ましく、融点が１００℃〜１５０℃のも
のが最適である。高融点樹脂層２１は、リードと外装ケ
ースの金属箔との短絡防止性が要求されるために厚みが
２０〜５０μｍのポリエチレン樹脂やポリプロピレン樹
脂等のポリオレフィン樹脂、これらの共重合体や酸変性
されたものが好ましい。低融点接着性樹脂層２２は、外
装ケース１３の内面との密着性が要求されるために、厚
みが２〜１５μｍのポリエチレン樹脂やポリプロピレン
樹脂等のポリオレフィン樹脂、これらの共重合体や酸変
性されたものが好ましく、外装ケースの金属箔との短絡
防止性から高融点樹脂層２１よりも融点が３０℃以上低
い樹脂層であることが好ましい。The metal adhesive resin layer 20 is required to have good adhesion to the Al foil 23 and the Cu foil 24,
An olefin resin which has been subjected to an acid-denaturation treatment of 15 μm, particularly a maleic acid treatment, is preferable, and an olefin resin having a melting point of 100 ° C. to 150 ° C. is optimal. The high melting point resin layer 21 is required to have a short-circuit preventing property between the lead and the metal foil of the outer case, so that a polyolefin resin such as a polyethylene resin or a polypropylene resin having a thickness of 20 to 50 μm, a copolymer thereof, or an acid-modified resin is used. Are preferred. The low-melting adhesive resin layer 22 is required to have an adhesive property with the inner surface of the outer case 13, and therefore has a thickness of 2 to 15 μm, such as a polyolefin resin such as a polyethylene resin or a polypropylene resin, a copolymer thereof, or an acid-modified resin. The resin layer is preferably a resin layer having a melting point lower than that of the high-melting resin layer 21 by 30 ° C. or more from the viewpoint of preventing short circuit with the metal foil of the outer case.
【００１３】発電要素１０を内部に収納する外装ケース
１３は、電解液、水のバリアー性が要求されるために２
０〜５０μｍのアルミニウム製箔からなる金属箔層の外
側に、耐電解液性、機械的強度が要求されるために厚さ
が１０μｍ〜５０μｍのポリアミド（ナイロン）樹脂
層、内側に熱溶着性とリードとの短絡防止性が要求され
るためにポリエチレン樹脂やポリプロピレン樹脂等のポ
リオレフィン樹脂、これらの共重合体や酸変性された樹
脂層からなる外装ケースが好ましい。The outer case 13 for housing the power generating element 10 therein is required to have a barrier property of an electrolytic solution and water.
A polyamide (nylon) resin layer having a thickness of 10 μm to 50 μm on the outside of a metal foil layer made of an aluminum foil having a thickness of 0 to 50 μm because electrolyte resistance and mechanical strength are required. An outer case made of a polyolefin resin such as a polyethylene resin or a polypropylene resin, a copolymer thereof, or an acid-modified resin layer is preferable because short-circuit prevention with a lead is required.
【００１４】発電要素１０を外装ケース１３の内部に収
納した後、外装ケース１３の開口部より所定量の電解液
注入した後に、熱溶着により封口される。After the power generation element 10 is housed in the outer case 13, a predetermined amount of electrolyte is injected from the opening of the outer case 13, and then sealed by heat welding.
【００１５】[0015]
【実施例】本発明を実施例、比較例を用いて詳しく説明
する。The present invention will be described in detail with reference to examples and comparative examples.
【００１６】（実施例１）正極１は活物質であるＬｉＣ
ｏＯ2と導電剤としてアセチレンブラック、および結着
剤兼電解液保持剤としてのポリマーであるフッ化ビニリ
デン（ＶＤＦ）とヘキサフルオロプロピレン（ＨＦＰ）
との共重合体Ｐ（ＶＤＦ−ＨＦＰ）をＮＭＰ（Ｎ−メチ
ル−２−ピロリドン）からなる有機溶媒に混練分散した
ペーストをラス加工したＡｌ箔製集電体２に塗着、乾
燥、圧延して、正極合剤層３としたものである。この２
枚の正極の間に、前記Ｐ（ＶＤＦ−ＨＦＰ）のフィルム
からなるセパレ−タ９を介してリチウムを吸蔵、放出で
きる易黒鉛化炭素と前記Ｐ（ＶＤＦ−ＨＦＰ）の粉末を
アセトンとシクロヘキサノンからなる混合有機溶媒に混
練分散したペーストをＣｕ箔製集電体６に塗着、乾燥、
圧延して、負極合剤層７を形成した負極５を配設し、全
体が図２に示すように積層されて電池要素１０が構成さ
れる。４は正極の集電部に設けたリード取り付け部であ
り、ここには外装ケースのシール部と接する箇所に、融
点が１３８℃で厚さが１０μｍのマレイン酸変性ポリプ
ロピレン樹脂からなる金属接着性樹脂層２０、融点が１
７０℃で厚さが３２μｍのポリエチレン−ポリプロピレ
ン共重合体からなる高融点樹脂層２１、融点が１１８℃
で厚さが４μｍのポリエチレン樹脂からなる低融点接着
性樹脂層２２であり、これらを積層一体化した樹脂層で
被覆されているＡｌ箔製正極リード１１が溶接されてい
る。８は負極の集電部に設けたリード取り付け部であ
り、ここにもＡｌ箔製正極リード１１と同様の金属接着
性樹脂層２０、高融点樹脂層２１、低融点接着性樹脂層
２２を順に積層一体化した樹脂層で被覆されているＣｕ
製負極リード１２が溶接されている。(Example 1) The positive electrode 1 is made of LiC as an active material.
oO 2 , acetylene black as a conductive agent, and vinylidene fluoride (VDF) and hexafluoropropylene (HFP), which are polymers as a binder and an electrolyte retainer
A paste obtained by kneading and dispersing a copolymer P (VDF-HFP) with an organic solvent composed of NMP (N-methyl-2-pyrrolidone) is applied to a lath-processed Al foil current collector 2, dried and rolled. Thus, the positive electrode mixture layer 3 was obtained. This 2
A graphitizable carbon capable of absorbing and releasing lithium and the powder of P (VDF-HFP) and acetone and cyclohexanone between the positive electrodes through a separator 9 made of the P (VDF-HFP) film. The paste kneaded and dispersed in the mixed organic solvent is applied to a current collector 6 made of Cu foil, dried,
The negative electrode 5 on which the negative electrode mixture layer 7 is formed by rolling is provided, and the whole is laminated as shown in FIG. 2 to form the battery element 10. Reference numeral 4 denotes a lead mounting portion provided on the current collecting portion of the positive electrode, in which a metal adhesive resin made of a maleic acid-modified polypropylene resin having a melting point of 138 ° C. and a thickness of 10 μm is provided at a portion in contact with the sealing portion of the outer case. Layer 20, melting point 1
High melting point resin layer 21 made of polyethylene-polypropylene copolymer having a thickness of 32 μm at 70 ° C., melting point of 118 ° C.
Is a low-melting adhesive resin layer 22 made of polyethylene resin having a thickness of 4 μm, and a positive electrode lead 11 made of Al foil covered with a resin layer obtained by laminating and integrating these is welded. Reference numeral 8 denotes a lead mounting portion provided on the current collecting portion of the negative electrode. Here, a metal adhesive resin layer 20, a high melting point resin layer 21, and a low melting point adhesive resin layer 22 similar to those of the Al foil positive electrode lead 11 are sequentially arranged. Cu covered with a laminated and integrated resin layer
The negative electrode lead 12 is welded.
【００１７】これらのリードを有する電池要素１０を外
装ケース１３の内部に収納した後、外装ケース１３の開
口部よりエチレンカーボネートとエチルメチルカーボネ
ートを体積比１：３の混合溶媒にＬｉＰＦ6を１〜１．
５モル／ｌ溶解した電解液を所定量を注入した後に、熱
溶着により封口して、非水電解質二次電池を作製した。After the battery element 10 having these leads is housed in the outer case 13, ethylene carbonate and ethyl methyl carbonate are mixed with a mixed solvent of LiPF 6 at a volume ratio of 1: 3 from the opening of the outer case 13. 1.
After injecting a predetermined amount of the electrolytic solution dissolved at 5 mol / l, the solution was sealed by heat welding to produce a non-aqueous electrolyte secondary battery.
【００１８】（実施例２）金属接着性樹脂層２０に融点
が１５０℃で厚さ１０μｍのマレイン酸変性ポリプロピ
レン樹脂、高融点樹脂層２１に融点が１７５℃で厚さ２
６μｍのポリエチレン−ポリプロピレン共重合体、低融
点接着性樹脂層２２に融点が１３８℃で厚さ４μｍのポ
リエチレン−ポリプロピレン共重合体を用いた以外は実
施例１と同様にして非水電解質二次電池を作製した。Example 2 A maleic acid-modified polypropylene resin having a melting point of 150.degree. C. and a thickness of 10 .mu.m was formed on the metal adhesive resin layer 20, and a high melting point resin layer 21 having a melting point of 175.degree.
Non-aqueous electrolyte secondary battery in the same manner as in Example 1 except that a polyethylene-polypropylene copolymer of 6 μm and a polyethylene-polypropylene copolymer having a melting point of 138 ° C. and a thickness of 4 μm were used for the low-melting adhesive resin layer 22. Was prepared.
【００１９】（比較例１）低融点接着樹脂層２２に融点
が１１８℃で厚さ４０μｍのポリエチレン樹脂、金属接
着性樹脂層２０にはマレイン酸変性していないポリプロ
ピレン樹脂を設けた以外は実施例１と同様にして非水電
解質二次電池を作製した。(Comparative Example 1) An Example except that the low melting point adhesive resin layer 22 was provided with a polyethylene resin having a melting point of 118 ° C. and a thickness of 40 μm, and the metal adhesive resin layer 20 was provided with a polypropylene resin not modified with maleic acid. A non-aqueous electrolyte secondary battery was produced in the same manner as in Example 1.
【００２０】（比較例２）金属接着性樹脂層２０に融点
が１３８℃で厚さ４μｍのマレイン酸変性ポリプロピレ
ン樹脂、高融点樹脂層２１には何も設けなかった以外は
実施例１と同様にして非水電解質二次電池を作製した。COMPARATIVE EXAMPLE 2 A maleic acid-modified polypropylene resin having a melting point of 138.degree. C. and a thickness of 4 .mu.m was provided on the metal adhesive resin layer 20, and nothing was provided on the high melting point resin layer 21. Thus, a non-aqueous electrolyte secondary battery was manufactured.
【００２１】実施例１、実施例２、比較例１、比較例２
で得られた電池を各２０セル用意して、気密性、液密性
と短絡防止性を評価した。Example 1, Example 2, Comparative Example 1, Comparative Example 2
Each of the batteries obtained in the above was prepared for 20 cells, and the airtightness, liquid tightness, and short circuit prevention were evaluated.
【００２２】気密性、液密性の評価は、温度６０℃、湿
度９０％の恒温恒湿中に１０００時間放置した場合のふ
くれ量を測定し、ふくれ量が初期厚みの１０％を超える
ものを気密性、液密性ＮＧと判定した。The airtightness and liquid tightness were evaluated by measuring the amount of blister when left for 1000 hours in a constant temperature and humidity condition of a temperature of 60 ° C. and a humidity of 90%. If the blister amount exceeded 10% of the initial thickness, It was judged as airtight and liquid tight NG.
【００２３】短絡防止性の評価はアルミニウム箔層の端
面と正極リード端子間の電圧を測定し、電圧の有無で短
絡の有無を判定した。短絡していない場合は０Ｖであ
る。For the evaluation of short-circuit prevention, the voltage between the end surface of the aluminum foil layer and the positive electrode lead terminal was measured, and the presence or absence of the voltage was used to determine the presence or absence of a short circuit. When there is no short circuit, it is 0V.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１から高融点樹脂層のない比較例１の場
合は、熱溶着時に金属箔層とリード端子間の電圧が発生
し短絡したものが１２／２０個発生した。また、低融点
接着樹脂層がない比較例２の場合は、低融点接着層と外
装ケースの内側の界面から水分が侵入し、電池要素と反
応したふくれが１０／２０個発生した。これに対して、
実施例１、実施例２の場合は、気密性、液密性と短絡防
止機能に優れていることが明らかになった。From Table 1, in the case of Comparative Example 1 having no high melting point resin layer, 12/20 short-circuits occurred due to the occurrence of a voltage between the metal foil layer and the lead terminal during thermal welding. In Comparative Example 2 having no low-melting-point adhesive resin layer, moisture penetrated from the interface between the low-melting-point adhesive layer and the inside of the outer case, and 10/20 blisters reacted with the battery element were generated. On the contrary,
In the case of Example 1 and Example 2, it became clear that they were excellent in airtightness, liquid tightness and short-circuit prevention function.
【００２６】[0026]
【発明の効果】以上の説明のとおり本発明の薄い樹脂フ
ィルム主体のラミネートシートからなる袋状外装ケース
を有する非水電解質二次電池によれば、少なくとも袋状
外装ケースのシール部と接するリード表面が金属接着性
樹脂層、高融点樹脂層、低融点接着性樹脂層を順に積層
一体化されたリードを用いることにより、気密性、液密
性と短絡防止機能の両方に優れた非水電解質二次電池を
提供することができる。As described above, according to the nonaqueous electrolyte secondary battery of the present invention having a bag-shaped outer case made of a laminated sheet mainly composed of a thin resin film, at least the lead surface in contact with the seal portion of the bag-shaped outer case. Uses a lead in which a metal adhesive resin layer, a high-melting-point resin layer, and a low-melting-point adhesive resin layer are sequentially laminated and integrated, so that the non-aqueous electrolyte has excellent airtightness, liquid tightness, and short-circuit prevention function. A secondary battery can be provided.
【図１】本発明の一実施形態における電池の上面図FIG. 1 is a top view of a battery according to an embodiment of the present invention.
【図２】同電池の断面図FIG. 2 is a sectional view of the battery.
【図３】本発明の一実施形態におけるリードの詳細断面
図FIG. 3 is a detailed sectional view of a lead according to an embodiment of the present invention.
１ 正極 ２ 正極集電体 ３ 正極合剤層 ４ 正極リード取り付け部 ５ 負極 ６ 負極集電体 ７ 負極合剤層 ８ 負極リード取り付け部 ９ セパレータ １０ 電池要素 １１ 正極リード １２ 負極リード １３ 外装ケース ２０ 金属接着性樹脂層 ２１ 高融点樹脂層 ２２ 低融点接着性樹脂層 ２３ Ａｌ箔 ２４ Ｃｕ箔 DESCRIPTION OF SYMBOLS 1 Positive electrode 2 Positive electrode collector 3 Positive electrode mixture layer 4 Positive electrode lead attachment part 5 Negative electrode 6 Negative electrode collector 7 Negative electrode mixture layer 8 Negative electrode lead attachment part 9 Separator 10 Battery element 11 Positive electrode lead 12 Negative electrode lead 13 Outer case 20 Metal Adhesive resin layer 21 High melting point resin layer 22 Low melting point adhesive resin layer 23 Al foil 24 Cu foil
フロントページの続き (72)発明者 吉尾 英明 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 5H011 AA03 AA17 CC10 5H022 AA09 BB03 CC03 CC05 EE06 5H029 AJ01 AJ15 AK03 AL06 AL07 AM03 AM07 BJ04 BJ12 CJ06 DJ02 DJ05 EJ11 EJ12 HJ14Continuation of front page (72) Inventor Hideaki Yoshio 1006 Kadoma Kadoma, Osaka Prefecture F-term (reference) 5H011 AA03 AA17 CC10 5H022 AA09 BB03 CC03 CC05 EE06 5H029 AJ01 AJ15 AK03 AL06 AL07 AM03 AM12 BJ04 CJ06 DJ02 DJ05 EJ11 EJ12 HJ14
Claims (3)
極板、電解質を保持するセパレータおよび負極板を積層
した扁平な電池要素を、樹脂フィルム主体のラミネート
シートで形成された袋状外装ケース内に収納するととも
に、前記正極板および負極板にそれぞれ一端が接続され
た正極リード及び負極リードを、前記外装ケースのシー
ル部より外部に引き出した電池において、前記リード
は、少なくとも前記外装ケースのシール部と接するリー
ド表面が金属接着性樹脂層、高融点樹脂層、低融点接着
性樹脂層を順に積層一体化されたリードであることを特
徴とする非水電解質二次電池。1. A flat battery element in which a sheet-like or film-like positive electrode plate, a separator holding an electrolyte, and a negative electrode plate are laminated is housed in a bag-shaped outer case formed of a laminate sheet mainly composed of a resin film. In a battery in which a positive electrode lead and a negative electrode lead, one ends of which are connected to the positive electrode plate and the negative electrode plate, respectively, are drawn out of a sealing portion of the outer case, the lead is at least a lead contacting the sealing portion of the outer case. A non-aqueous electrolyte secondary battery characterized in that the surface is a lead in which a metal adhesive resin layer, a high melting point resin layer, and a low melting point adhesive resin layer are sequentially laminated and integrated.
ン樹脂であることを特徴とする請求項１に記載の非水電
解質二次電池。2. The non-aqueous electrolyte secondary battery according to claim 1, wherein the metal adhesive resin layer is an acid-modified olefin resin.
との融点差が３０℃以上であることを特徴とする請求項
１に記載の非水電解質二次電池。3. The non-aqueous electrolyte secondary battery according to claim 1, wherein a difference in melting point between the high melting point resin layer and the low melting point adhesive resin layer is 30 ° C. or more.
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|---|---|---|---|
| JP2000114886A JP3596420B2 (en) | 2000-04-17 | 2000-04-17 | Non-aqueous electrolyte secondary battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000114886A JP3596420B2 (en) | 2000-04-17 | 2000-04-17 | Non-aqueous electrolyte secondary battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001297748A true JP2001297748A (en) | 2001-10-26 |
| JP3596420B2 JP3596420B2 (en) | 2004-12-02 |
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ID=18626616
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|---|---|---|---|
| JP2000114886A Expired - Fee Related JP3596420B2 (en) | 2000-04-17 | 2000-04-17 | Non-aqueous electrolyte secondary battery |
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|---|---|---|---|---|
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| JP2006107894A (en) * | 2004-10-05 | 2006-04-20 | Gs Yuasa Corporation:Kk | Battery |
| JP2008192451A (en) * | 2007-02-05 | 2008-08-21 | Sony Corp | Sealant film for lead, and nonaqueous electrolyte battery |
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| KR101238976B1 (en) | 2006-01-10 | 2013-03-04 | 스미토모덴키고교가부시키가이샤 | Electrical part, nonaqueous-electrolyte cell, and lead conductor with insulating coating layer and sealed vessel each for use in these |
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