JPH0888021A - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JPH0888021A JPH0888021A JP6220345A JP22034594A JPH0888021A JP H0888021 A JPH0888021 A JP H0888021A JP 6220345 A JP6220345 A JP 6220345A JP 22034594 A JP22034594 A JP 22034594A JP H0888021 A JPH0888021 A JP H0888021A
- Authority
- JP
- Japan
- Prior art keywords
- negative electrode
- positive electrode
- secondary battery
- ion secondary
- electrode
- 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.)
- Pending
Links
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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、リチウムイオン二次電
池に関するものであり、特に、電気自動車用、電力のロ
ードレベリング用など、大容量でエネルギー密度が高
く、且つメンテナンスフリーの要求が高い分野で使用さ
れうるリチウム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 lithium-ion secondary battery, and particularly to a field of large capacity, high energy density, and high maintenance-free demand for electric vehicles, load leveling of electric power, and the like. The present invention relates to a lithium secondary battery that can be used in.
【０００２】[0002]
【従来の技術】近年、電子機器の小型化、軽量化に対応
して、その電源として、軽量で小型としては容量の大き
い、エレクトロニクス用のリチウムイオン二次電池が実
用化され、ハンディビデオカメラや携帯用パソコン等に
使われている。しかし、その容量は大きくて、５〜２０
Ｗｈ程度であり、円筒型が多い。一方、環境問題等から
電気自動車が世の中の注目を引いており、又、夜間電力
を有効活用するための電力のロードレベリングの必要性
が高まっている。従って、これらに必要な大容量で、コ
ストが安く、メンテナンスフリーの二次電池に対する要
求が高まっている。2. Description of the Related Art In recent years, in response to the miniaturization and weight reduction of electronic equipment, a lithium-ion secondary battery for electronics, which is lightweight and small in size and has a large capacity, has been put into practical use as a power source for handheld video cameras and It is used in portable personal computers. However, its capacity is large, 5-20
It is about Wh, and there are many cylindrical types. On the other hand, electric vehicles are attracting public attention due to environmental issues and the need for load leveling of electric power to effectively use nighttime electric power is increasing. Therefore, there is an increasing demand for a secondary battery which has a large capacity, is inexpensive, and is maintenance-free, which is required for these.
【０００３】しかし、この分野で広く使われている鉛蓄
電池は、エネルギー密度が低く、重くて使いにくい。更
に、メンテナンスの面でも、補水など手間がかかるう
え、充放電サイクル寿命も６００サイクル程度と寿命が
短く、結果的に電池にかかるコストも高くなっている。
一部にニッケル・カドミウム電池も使用されているが、
エネルギー密度も充分に高くなく、鉛蓄電池と較べてコ
ストが高いので、余り広く使われていない。However, lead-acid batteries widely used in this field have a low energy density, are heavy and are difficult to use. Further, in terms of maintenance, it takes time and labor such as replenishing water, and the life of the charge / discharge cycle is as short as about 600 cycles, resulting in high cost of the battery.
Nickel-cadmium batteries are also used in some parts,
The energy density is not high enough and the cost is higher than that of the lead storage battery, so it is not widely used.
【０００４】これらの他、ニッケル亜鉛電池、ナトリウ
ム・硫黄電池も試験的に電気自動車用に使用されている
が、前者は充放電サイクル寿命が短いこと、後者は危険
性が高いなどの問題点を含んでいる。リチウムイオン二
次電池はエネルギー密度が高く、且つ密閉型でメンテナ
ンスフリーであるので、これらの用途に対して適してい
るが、従来は大型のものは実用化されていない。これら
の用途に供するには１０００〜５０００Ｗｈ程度の容量
のものが必要であり、従来実用化されているものの１０
０倍以上の容量のものを作る必要がある。In addition to these, nickel-zinc batteries and sodium-sulfur batteries have also been experimentally used for electric vehicles. However, the former has a short charge / discharge cycle life, and the latter has a high risk. Contains. The lithium ion secondary battery has a high energy density, is a sealed type, and is maintenance-free, and thus is suitable for these applications, but a large-sized lithium ion secondary battery has not been put into practical use in the past. In order to be used for these purposes, it is necessary to have a capacity of about 1000 to 5000 Wh.
It is necessary to make one with a capacity of 0 times or more.
【０００５】従来実用化されているリチウムイオン二次
電池は円筒型が主流であるが、電気自動車用、ロードレ
ベリング用などに必要な１０００〜５０００Ｗｈ級のも
のは金属箔等に正極活物質合剤を塗布した正極と金属箔
等に負極活物質合剤を塗布した負極をセパレーターを挟
んで交互に積層する構造の３〜４Ｖの単電池を２個以上
直列に接続して組電池を構成する角型電池となる。この
ような角形リチウムイオン二次電池はまだ実用化されて
いない。また、電気自動車用に適した、大型で、強靱
性、耐振動性、耐衝撃性の優れたリチウムイオン二次電
池も実用化されていない。Cylindrical type has been the mainstream of lithium ion secondary batteries that have been put into practical use, but the 1000 to 5000 Wh class required for electric vehicles, load leveling, etc. is a positive electrode active material mixture on a metal foil or the like. A corner that forms a battery pack by connecting two or more unit cells of 3 to 4 V having a structure in which a positive electrode coated with and a negative electrode coated with a negative electrode active material mixture on a metal foil or the like are alternately stacked with a separator interposed therebetween. Type battery. Such a prismatic lithium ion secondary battery has not yet been put to practical use. In addition, a large-sized lithium ion secondary battery suitable for electric vehicles and excellent in toughness, vibration resistance and impact resistance has not been put into practical use.
【０００６】[0006]
【発明が解決しようとする課題】リチウムイオン二次電
池と電気自動車やロードレベリング用などに必要な大容
量の二次電池として使用する場合、先ず、これを大容量
化することが必要である。その場合、リチウムイオン二
次電池は通常所謂、角型となる。それは、構成する各単
電池は数十枚から１００枚前後の電極を負極・正極交互
にセパレーターを挟んで積層したものとなり、普通この
単電池を直列に接続したものを組電池とすることとな
る。When used as a lithium ion secondary battery and a large-capacity secondary battery required for electric vehicles, load leveling, etc., it is first necessary to increase the capacity. In that case, the lithium ion secondary battery is usually a so-called prismatic type. It consists of several tens to about 100 electrodes of each unit cell, which are laminated with alternating negative and positive electrodes with a separator sandwiched between them. Normally, these cells are connected in series to form an assembled battery. .
【０００７】特に電気自動車等に使用する場合は、大型
化すると共に、その強靱性、耐振動性、耐衝撃性が要求
される。そのためには、電極そのものの充放電サイクル
寿命、強靱性、耐振動性、耐衝撃性が高いことが必要で
あるが、電極を多層積層した単電池の構造も、強靱性、
耐振動性、耐衝撃性が高くなるように工夫する必要があ
る。In particular, when it is used in an electric vehicle or the like, it is required to have a large size and toughness, vibration resistance and impact resistance. For that purpose, the charge / discharge cycle life of the electrode itself, toughness, vibration resistance, and impact resistance are required to be high, but the structure of the single cell in which the electrodes are laminated in multiple layers also has toughness,
It is necessary to devise so that vibration resistance and impact resistance are high.
【０００８】このように、リチウムイオン二次電池を大
型化し、強靱性、耐振動性、耐衝撃性を高めることが求
められている。そこで、本発明者は、この目的のために
積層する正極の金属箔の耳の部分及び積層する負極の金
属箔の耳の部分を分離して別々に導電体のスペーサーを
挟んで締め付けこのスペーサーを通して電気を集電する
構造のものが適していることを見出したが、単電池を組
み立てる際に、手間が掛かり、生産性が十分でないのが
問題である。また、スペーサーを電極の金属箔の耳の部
分に挟み込む際に、電極活物質の粉などを噛み込み、導
電性及び伝熱性の悪い部分が発生することがあるという
問題がある。そこで、本発明者は、さらにこれらの課題
をも解決すべく種々検討を行ない本発明に到達した。As described above, it is required to increase the size of the lithium ion secondary battery and enhance the toughness, vibration resistance and impact resistance. Therefore, the inventor of the present invention separates the edge portion of the positive electrode metal foil to be laminated and the edge portion of the negative electrode metal foil to be laminated for this purpose, and separately tightens the spacers of the conductors to tighten the spacers. It has been found that a structure that collects electricity is suitable, but it is troublesome when assembling the unit cells, and the productivity is not sufficient. Further, when the spacer is sandwiched between the ears of the metal foil of the electrode, powder of the electrode active material or the like may be caught, and a part having poor conductivity and heat conductivity may be generated. Therefore, the present inventor has made various investigations in order to solve these problems and has reached the present invention.
【０００９】[0009]
【課題を解決するための手段】すなわち、本発明の要旨
は、金属材料に正極活物質合剤を塗布した正極と金属材
料に負極活物質合剤を塗布した負極をセパレーターを挟
んで交互に積層する構造の単電池からなるリチウムイオ
ン二次電池において、電極を多層積層し、電極の金属材
料の耳の部分を、正極及び負極に分離してそれぞれ導電
体に電気的に接続し、集電体を形成するに当たり、正極
及び負極の金属材料の耳の部分を、分離してそれぞれ複
数枚束ねて、この導電体で挟み、その電極の耳の部分と
この導電体を機械的に締め付けて、集電体を形成し、こ
の導電体を通して電気を取り出すように構成してなるこ
とを特徴とするリチウムイオン二次電池にある。That is, the gist of the present invention is that a positive electrode in which a positive electrode active material mixture is applied to a metal material and a negative electrode in which a negative electrode active material mixture is applied to a metal material are alternately laminated with a separator interposed therebetween. In a lithium-ion secondary battery composed of a single cell having a structure described above, the electrodes are laminated in multiple layers, and the ears of the metal material of the electrodes are separated into a positive electrode and a negative electrode and electrically connected to a conductor, respectively, and a current collector. To form the positive electrode and the negative electrode, separate the metal tabs of the positive electrode and the negative electrode, bundle them together, and sandwich them with this conductor.Mechanically tighten the tabs of the electrode and this conductor to collect them. A lithium ion secondary battery is characterized in that an electric body is formed and electricity is taken out through the electric conductor.
【００１０】以下、本発明を詳細に説明する。まず、本
発明におけるリチウムイオン二次電池の構成要素は、少
なくとも負極、正極、セパレーター、非水電解液からな
り、負極活物質としてはリチウムをインターカーレーシ
ョン又はドーピングできる炭素材が一般的であり、正極
活物質とはリチウムを吸蔵又はインターカーレーション
できるＬｉx ＣｏＯ2 等の金属酸化物系化合物、Ｌｉx
ＴｉＳ2 等のカルコゲナイト系化合物等である。The present invention will be described in detail below. First, the constituent elements of the lithium-ion secondary battery in the present invention are at least a negative electrode, a positive electrode, a separator, a non-aqueous electrolyte solution, the negative electrode active material is generally a carbon material capable of intercalation or doping of lithium, The positive electrode active material is a metal oxide compound such as Li x CoO 2 that can occlude or intercalate lithium, Li x
Examples thereof include chalcogenite compounds such as TiS 2 .
【００１１】負極は負極活物質と粘結剤（バインダー）
〔負極合剤〕を溶媒でスラリー化したものを銅等の金属
の箔等に塗布し、乾燥したもので、場合によってはロー
ル処理等を施したものである。正極は正極活物質と粘結
剤（バインダー）と導電剤〔正極合剤〕を溶媒でスラリ
ー化したものをアルミニウム等の金属の箔等に塗布し、
乾燥したもので、場合によってはロール処理等を施した
ものである。The negative electrode is a negative electrode active material and a binder.
A slurry of [negative electrode mixture] in a solvent is applied to a foil of a metal such as copper, dried, and optionally roll-treated. The positive electrode is obtained by applying a slurry of a positive electrode active material, a binder (binder), and a conductive agent [positive electrode mixture] in a solvent to a metal foil such as aluminum or the like,
It is dried and, if necessary, roll-treated.
【００１２】セパレーターとしては、多孔性の合成樹脂
の薄膜、例えば２５μｍ厚さのポリプロピレン樹脂の多
孔性の薄膜、２０μｍ厚さのポリエチレン樹脂の多孔性
の薄膜等が使用されるが、これらに限るものではない。
非水電解液は、リチウム塩を有機溶媒に溶解したものが
使用される。リチウム塩は特に限定されないが、例え
ば、ＬｉＰＦ6 、ＬｉＢＦ4 、ＬｉＣｌＯ4 、ＬｉＡｓ
Ｆ6 、ＬｉＣＦ3 ＳＯ3 等が挙げられる。有機溶媒は特
に限定されないが、例えば、カーボネート類、エーテル
類、ケトン類、スルホラン系化合物、ラクトン類、ニト
リル類、塩素化炭化水素類、アミン類、エステル類、ア
ミド類、燐酸エステル系化合物、等を使用することがで
きる。As the separator, a thin film of a porous synthetic resin, for example, a thin film of a polypropylene resin having a thickness of 25 μm, a thin film of a polyethylene resin having a thickness of 20 μm, or the like is used, but is not limited to these. is not.
As the non-aqueous electrolyte, a solution obtained by dissolving a lithium salt in an organic solvent is used. The lithium salt is not particularly limited, and examples thereof include LiPF 6 , LiBF 4 , LiClO 4 , and LiAs.
F 6, LiCF 3 SO 3, and the like. The organic solvent is not particularly limited, for example, carbonates, ethers, ketones, sulfolane compounds, lactones, nitriles, chlorinated hydrocarbons, amines, esters, amides, phosphate ester compounds, etc. Can be used.
【００１３】これらの代表的なものを列挙すると、プロ
ピレンカーボネート、エチレンカーボネート、ビニレン
カーボネート、テトラヒドロフラン、２メチルテトラヒ
ドロフラン、１，４ジオキサン、４メチル・２ペンタノ
ン、スルホラン、３メチルスルホラン、γブチロラクト
ン、ジメトキシエタン、ジエトキシエタン、アセトニト
リル、プロピオニトリル、ベンゾニトリル、ブチロニト
リル、バレロニトリル、１，２ジクロロエタン、ジメチ
ルホルムアミド、ジメチルスルホキシド、燐酸トリメチ
ル、燐酸トリエチル等及びこれらの混合溶媒がある。Typical examples of these are propylene carbonate, ethylene carbonate, vinylene carbonate, tetrahydrofuran, 2 methyltetrahydrofuran, 1,4 dioxane, 4methyl / 2pentanone, sulfolane, 3methylsulfolane, γ-butyrolactone and dimethoxyethane. , Diethoxyethane, acetonitrile, propionitrile, benzonitrile, butyronitrile, valeronitrile, 1,2 dichloroethane, dimethylformamide, dimethylsulfoxide, trimethyl phosphate, triethyl phosphate and the like and mixed solvents thereof.
【００１４】負極・正極の粘結剤としては、例えば、ポ
リフッ化ビニリデン、ポリテトラフッ化エチレン、ＥＰ
ＤＭ（エチレン−プロピレン−ジエン三元共重合体）、
ＳＢＲ（スチレン−ブタジエンゴム）、ＮＢＲ（アクリ
ロニトリル−ブタジエンゴム）、フッ素ゴム、等が使用
されるが、これらに限るものではない。正極の導電剤と
しては、黒鉛の微粒子、アセチレンブラック等のカーボ
ンブラック、ニードルコークス等無定形炭素の微粒子、
等が使用されるが、これらに限るものではない。As the binder for the negative electrode and the positive electrode, for example, polyvinylidene fluoride, polytetrafluoroethylene, EP
DM (ethylene-propylene-diene terpolymer),
SBR (styrene-butadiene rubber), NBR (acrylonitrile-butadiene rubber), fluororubber and the like are used, but not limited to these. As the positive electrode conductive agent, fine particles of graphite, carbon black such as acetylene black, fine particles of amorphous carbon such as needle coke,
Etc. are used, but not limited to these.
【００１５】負極の負極合剤、正極の正極合剤をスラリ
ーにする溶媒としては、通常は粘結剤を溶解する有機溶
媒が使用される。例えば、Ｎメチルピロリドン、ジメチ
ルホルムアミド、ジメチルアセンアミド、メチルエチル
ケトン、シクロヘキサノン、酢酸メチル、アクリル酸メ
チル、ジエチルトリアミン、ＮＮジメチルアミノプロピ
ルアミン、エチレンオキシド、テトラヒドロフラン、等
が使用されるが、これらに限るものではない。As a solvent for making the negative electrode mixture of the negative electrode and the positive electrode mixture of the positive electrode into a slurry, an organic solvent capable of dissolving the binder is usually used. For example, N-methylpyrrolidone, dimethylformamide, dimethylacenamide, methylethylketone, cyclohexanone, methyl acetate, methyl acrylate, diethyltriamine, NN dimethylaminopropylamine, ethylene oxide, tetrahydrofuran, etc. are used, but not limited to these. .
【００１６】又、水に分散剤、増粘剤等を加えたもので
負極合剤、正極合剤をスラリー化して、或いは、ＳＢＲ
等のラテックスで電極活物質等をスラリー化して、これ
を金属の箔等に塗布し、電極を製造する場合もある。負
極活物質はリチウムをインターカーレーション又はドー
ピング出来る炭素材であり、この炭素材は特に限定され
ないが、例えば、黒鉛及び、石炭系コークス、石油系コ
ークス、石炭系ピッチの炭化物、石油系ピッチの炭化
物、ニードルコークス、ピッチコークス、フェノール樹
脂・結晶セルローズ等の炭化物、等及びこれらを一部黒
鉛化した炭素材、ファーネスブラック、アセチレンブラ
ック、ピッチ系炭素繊維、等が挙げられる。Further, the negative electrode mixture and the positive electrode mixture are slurried with water to which a dispersant, a thickener and the like are added, or SBR.
In some cases, the electrode active material or the like is slurried with a latex such as the above and applied to a metal foil or the like to manufacture an electrode. The negative electrode active material is a carbon material capable of intercalating or doping with lithium, and the carbon material is not particularly limited, and examples thereof include graphite and coal-based coke, petroleum-based coke, carbide of coal-based pitch, and carbide of petroleum-based pitch. Carbides such as needle coke, pitch coke, phenol resin and crystalline cellulose, and the like, and carbon materials obtained by partially graphitizing these, furnace black, acetylene black, pitch-based carbon fiber, and the like.
【００１７】正極活物質はリチウムを吸蔵又はインター
カーレーション出来る金属酸化物系化合物、カルコゲナ
イト系化合物等であり、特に限定されないが、例えば、
Ｌｉ x ＣｏＯ2 、Ｌｉx ＭｎＯ2 、Ｌｉx Ｍｎ2 Ｏ4 、
Ｌｉx Ｖ2 Ｏ5 、Ｌｉx ＴｉＳ2 等が使用される。負極
の集電体の材質としては、銅、ニッケル、ステンレス
鋼、ニッケルメッキ鋼、等が使用され、正極の集電体の
材質としては、アルミニウム、ステンレス鋼、ニッケル
メッキ鋼、等が使用されるが、いずれもこれらに限るも
のではない。The positive electrode active material occludes or intercalates lithium.
Metal oxide compounds that can be curated, chalcogena
Ito-based compounds and the like, but are not particularly limited, for example,
Li xCoO2 , LixMnO2 , LixMn2 OFour ,
LixV2 OFive , LixTiS2 Etc. are used. Negative electrode
The current collector materials are copper, nickel, and stainless steel.
Steel, nickel-plated steel, etc. are used for the positive electrode current collector.
Materials are aluminum, stainless steel, nickel
Plated steel, etc. are used, but are not limited to these
Not of.
【００１８】本発明におけるリチウムイオン二次電池
は、金属材料に正極活物質合剤を塗布した正極と金属材
料に負極活物質合剤を塗布した負極をセパレーターを挟
んで交互に積層する単電池からなる。この積層は、目的
に応じ選定しうるが、電池を大型化するには、電極を十
数枚以上、場合によっては１００枚前後多層積層する必
要がある。The lithium ion secondary battery according to the present invention comprises a single battery in which a positive electrode in which a positive electrode active material mixture is applied to a metal material and a negative electrode in which a negative electrode active material mixture is applied to a metal material are alternately laminated with a separator interposed therebetween. Become. This stacking can be selected according to the purpose, but in order to increase the size of the battery, it is necessary to stack a dozen or more electrodes, and in some cases about 100 electrodes in multiple layers.
【００１９】正又は負の活物質合剤を塗布する金属材料
としては、金属箔、金属板、金属多孔板、金網等の薄い
材料が好適である。本発明においては、この金属材料の
電極活物質合剤が塗布されていない部分である耳の部分
を、正極及び負極に分離してそれぞれ導電体に電気的に
接続し、集電体を形成するに当たり、正極及び負極の金
属材料の耳の部分を分離してそれぞれ複数枚束ねて、こ
の導電体で挟み、その電極の耳の部分とこの導電体を機
械的に締めつけて、この導電体を通して電気を取り出す
ように構成される。As a metal material for applying the positive or negative active material mixture, a thin material such as a metal foil, a metal plate, a metal perforated plate or a wire net is suitable. In the present invention, the ear portion, which is a portion of the metal material on which the electrode active material mixture is not applied, is separated into a positive electrode and a negative electrode and electrically connected to a conductor to form a current collector. In this case, separate the ears of the positive and negative metal materials and bundle them together, sandwich them with this conductor, mechanically tighten the ears of the electrode and this conductor, and pass electricity through this conductor. Is configured to take out.
【００２０】ここで、導電体は、通常は棒状の金属片で
あるが、この棒に放熱用のフィン状のものが付いた金属
片、単電池の間を接続するように加工した金具なども含
まれ、場合によっては炭素を加工した導電体も含まれ
る。機械的に締め付ける方法としては、導電体で挟んだ
電極の耳の部分の積層体にリベットを通しこれをかしめ
て締め付けるのが好適である。この積層体にボルトを通
し、ナットで締め付けることもできる。また、この積層
体をクランプで締め付けることもできる。たとえば、図
１は導電体で挟んだ電極の耳の部分の積層体にリベット
を通し、これをかしめて締め付けたものを示す。さら
に、電極の耳の部分とこの導電体を機械的に締め付ける
とともに、電極の耳の部分の端部とこの導電体を溶接し
て電極と導電体の接続を更に強固にすることができる。Here, the conductor is usually a rod-shaped metal piece, but a metal piece having a fin-shaped member for heat dissipation attached to this rod, a metal fitting processed to connect between the single cells, and the like are also included. Included, and in some cases, carbon-processed conductors are also included. As a method of mechanically tightening, it is preferable to pass a rivet through the laminated body of the electrode ears sandwiched between the conductors and crimp the rivet to tighten. Bolts can be passed through this laminate and tightened with nuts. Further, this laminated body can be clamped. For example, FIG. 1 shows a structure in which a rivet is passed through the laminated body of the electrode ears sandwiched between conductors, and the rivet is caulked and tightened. Further, the ear portion of the electrode and this conductor can be mechanically tightened, and the end portion of the electrode ear portion and this conductor can be welded to further strengthen the connection between the electrode and the conductor.
【００２１】溶接方法としては、ＴＩＧ（タングステン
−イナートガス）溶接、高周波溶接又は超音波溶接が好
適である。溶接は、たとえば、図１に示すように、２枚
の金属片１に、束ねた電極の耳の部分の端部を両側から
挟み込み、リベットを通してかしめて締め付け、図２に
示すように、この端部の先端と挟んだ２枚の金属片１
を、この端部の先端の側から溶接することにより行われ
る。As a welding method, TIG (tungsten-inert gas) welding, high frequency welding or ultrasonic welding is suitable. For example, as shown in FIG. 1, welding is performed by sandwiching the ends of the ear portions of the bundled electrodes on two metal pieces 1 from both sides, crimping them with rivets, and tightening the ends as shown in FIG. Two metal pieces 1 sandwiched between the tip of the part
Is welded from the tip side of this end.
【００２２】この図１及び図２は、２枚の金属片の溶接
前と溶接後を表わし、２は金属箔、３は端子の金属片、
４はリベット、５は溶接部、６は端子の金属片３と金属
片１の溶接部、７は非導電性スペーサー、８はセパレー
ター、９は電極活物質層を示す。２枚の金属片の形状
は、束ねた電極の耳の部分の端部を両側から挟み込み、
端部の先端と挟んだ２枚の金属片を溶接するのと同様の
効果を有する形状のものであればよく、例えば、図３に
示すように、端子の金属片３と一体となっている金属片
１にスリット１０を開け、図４に示すように、これに束
ねた電極の耳の部分の端部を通してリベット４でかしめ
て締め付け、この端部の先端と金属片のスリット部を、
この端部の先端の側から溶接する形のものでもよい。1 and 2 show before and after welding of two metal pieces, 2 is a metal foil, 3 is a metal piece of a terminal,
Reference numeral 4 is a rivet, 5 is a welded portion, 6 is a welded portion between the metal piece 3 and the metal piece 1 of the terminal, 7 is a non-conductive spacer, 8 is a separator, and 9 is an electrode active material layer. The shape of the two metal pieces is such that the ends of the ear portions of the bundled electrodes are sandwiched from both sides,
Any shape may be used as long as it has the same effect as welding two metal pieces sandwiched between the tip of the end and the metal piece 3 of the terminal, for example, as shown in FIG. A slit 10 is opened in the metal piece 1, and as shown in FIG. 4, the end of the ear portion of the electrode bundled in the metal piece 1 is caulked and fastened with a rivet 4, and the tip of this end and the slit portion of the metal piece are
The shape of welding from the tip side of this end may be used.
【００２３】この図３及び４は、スリット型金属片を用
いた場合の溶接前と溶接後を表わす。本発明において
は、たとえば、正極及び負極の金属材料の耳の部分を、
夫々３〜３０枚、好ましくは５〜１０枚束ねて、２枚の
金属片で挟みその電極の耳の部分と２枚の金属片の積層
体に孔をあけリベットを通し、かしめて締め付け、更
に、その電極の耳の部分の端部の先端と２枚の金属片を
この端部の先端の側から溶接して、集電体を形成する。
例えば、負極、セパレーター、正極、セパレーター、負
極と積層した場合の負極−負極間の間隔は、通常０．５
ｍｍ弱から１．５ｍｍ程度であるので、５〜２０枚束ね
るとすると、その電極等の層の厚みは５〜１５ｍｍとな
る。従って、単電池の電極等の層の厚さが４０ｍｍ程度
の場合、正極・負極それぞれ４組程度の金属片で集電す
ることとなる。FIGS. 3 and 4 show before welding and after welding when a slit type metal piece is used. In the present invention, for example, the ear portion of the metal material of the positive electrode and the negative electrode,
Bundling 3 to 30 sheets, preferably 5 to 10 sheets each, sandwiching them with two metal pieces, punching holes in the electrode ear portion and the laminated body of the two metal pieces, passing rivets, caulking and tightening, Then, the tip of the end of the ear portion of the electrode and the two metal pieces are welded from the side of the tip of this end to form a current collector.
For example, when the negative electrode, the separator, the positive electrode, the separator and the negative electrode are laminated, the distance between the negative electrode and the negative electrode is usually 0.5.
Since the thickness is slightly less than mm to about 1.5 mm, if 5 to 20 sheets are bundled, the thickness of the layers such as the electrodes is 5 to 15 mm. Therefore, when the thickness of the layer such as the electrode of the unit cell is about 40 mm, the current is collected by about 4 sets of metal pieces for each of the positive electrode and the negative electrode.
【００２４】本発明においては、単電池を堅固な構造と
するために、正極と負極をセパレーターを挟んで交互に
積層するに当たり、正極−正極間、負極−負極間の間隔
を一定に保つために、非導電性のスペーサーを挟んで積
層し、非導電性の枠で単電池の電極の層を外側から締め
付ける構造とするのが好適である。単電池をこのような
構造にすることにより、より強靱で、耐振動性、耐衝撃
性により優れたものとなる。In the present invention, in order to make the unit cell to have a solid structure, in order to keep the positive electrode and the negative electrode alternately stacked with the separator in between, in order to keep the intervals between the positive electrode and the positive electrode and between the negative electrode and the negative electrode constant. It is preferable to have a structure in which non-conductive spacers are sandwiched between layers and the electrode layers of the unit cell are clamped from the outside with a non-conductive frame. By making the unit cell have such a structure, the unit cell is tougher and is excellent in vibration resistance and impact resistance.
【００２５】非導電性の枠としては、ポリプロピレン等
の合成樹脂製のもの、金属製でその表面の正極及び負極
と接触し、絶縁に必要な部分を非導電性材料で覆ったも
の等が用いられる。電極の間にスペーサーを挟み込むに
際しては、生産性の観点からたとえば次のような方法を
採用するのが好ましい。As the non-conductive frame, one made of synthetic resin such as polypropylene, or one made of metal which is in contact with the positive electrode and the negative electrode on the surface of the frame and which is covered with a non-conductive material is used. To be When sandwiching the spacer between the electrodes, it is preferable to adopt the following method from the viewpoint of productivity.
【００２６】（ｉ）正極及び負極の金属箔等の耳の部分
に、予め、スペーサーを接着剤で張りつけたものを使用
する。このようにすることにより、正極、セパレータ
ー、負極、セパレーター、正極の順に積層する作業を行
うことにより、スペーサーが挟み込まれた単電池が出来
上がるので、スペーサーを挟み込む作業が省かれ、リチ
ウムイオン二次電池の製造工程の生産性が著しく向上す
る。 （ii）スペーサーとして、電極の耳の長さ方向の長さに
見合う細長いスペーサーを使用する。このようにするこ
とにより、小さいスペーサーを挟み込む作業の回数が減
り、作業性も向上する。(I) A metal foil or the like of the positive electrode and the negative electrode, to which a spacer is attached in advance with an adhesive, is used. By doing so, by stacking the positive electrode, the separator, the negative electrode, the separator, and the positive electrode in this order, a single cell with the spacer sandwiched is completed, so the spacer sandwiching operation is omitted, and the lithium ion secondary battery is eliminated. The productivity of the manufacturing process is significantly improved. (Ii) As the spacer, an elongated spacer that matches the length of the electrode in the lengthwise direction is used. By doing so, the number of operations for sandwiching the small spacer is reduced, and the workability is also improved.
【００２７】[0027]
【実施例】以下、実施例により本発明を更に詳しく説明
するが、本発明はこれらに限られるものではない。 実施例１ （負極）石炭系ニードルコークスを粉砕し、平均粒径１
０μｍとしたもの９０部を、ポリフッ化ビニリデン１０
部をＮメチルピロリドン１５０部に溶解したものと混合
し、負極合剤スラリーとし、２０μｍ厚さの銅箔の両面
の塗布し、乾燥して溶媒を蒸発させ、ロール処理をして
負極を作る。負極合剤の塗布部の大きさは１２ｃｍ×１
５ｃｍ、厚さは片面２５０μｍとした。銅箔は上下には
特に耳を取らないが、左右には、左に２５ｍｍ、右に３
ｍｍの耳を残して負極合剤を塗布するように設計してあ
る。尚、単電池の端の部分を構成する電極は負極合剤を
片面のみに塗布したもので、厚さは２０μｍ、左に２５
ｍｍ、右に１５ｍｍの耳のあるものを使用する。EXAMPLES The present invention will be described in more detail with reference to examples below, but the present invention is not limited thereto. Example 1 (Negative electrode) Coal-based needle coke was crushed to have an average particle size of 1
90 parts of 0 μm was added to polyvinylidene fluoride 10
Part is mixed with 150 parts of N-methylpyrrolidone to form a negative electrode mixture slurry, and both sides of a copper foil having a thickness of 20 μm are applied, dried to evaporate the solvent, and subjected to roll treatment to form a negative electrode. Size of the negative electrode mixture application part is 12 cm x 1
The thickness was 5 cm and the thickness was 250 μm on each side. The copper foil doesn't take much attention to the top and bottom, but to the left and right, 25mm to the left and 3 to the right.
It is designed to be applied with the negative electrode mixture leaving the mm ear. In addition, the electrode forming the end portion of the unit cell was prepared by applying the negative electrode mixture only on one surface, and had a thickness of 20 μm and a thickness of 25 to the left.
mm, with a 15 mm ear on the right.
【００２８】（正極）炭酸リチウム１モルと炭酸コバル
ト２モルをボールミルで混合粉砕し、８５０℃で５時間
空気中で加熱処理した後、再度ボールミルで混合粉砕
し、更に８５０℃で５時間空気中で加熱処理したもの９
０部に、導電剤として、アセチレンブラックを５部加え
て混合したものをポリフッ化ビニリデン５部をＮメチル
ピロリドン１５０部に溶解したものと混合し、正極合剤
スラリーとし、２５μｍ厚さのアルミニウム箔の両面に
塗布し、乾燥して溶媒を蒸発させ、ロール処理をして正
極を作る。正極合剤の塗布部の大きさは１２ｃｍ×１５
ｃｍ、厚さは片面２５０μｍとした。アルミニウム箔は
上下には特に耳を取らないが、左右には、右に２５ｍ
ｍ、左に３ｍｍの耳を残して負極合剤を塗布するように
設計してある。(Positive electrode) 1 mol of lithium carbonate and 2 mol of cobalt carbonate were mixed and pulverized in a ball mill, heat-treated in air at 850 ° C. for 5 hours, mixed and pulverized again in a ball mill, and further 850 ° C. in air for 5 hours. Heat-treated with 9
A mixture of 0 part and 5 parts of acetylene black as a conductive agent and a mixture of 5 parts of polyvinylidene fluoride dissolved in 150 parts of N-methylpyrrolidone was used as a positive electrode mixture slurry, and an aluminum foil having a thickness of 25 μm. Is coated on both surfaces, dried to evaporate the solvent and roll-processed to prepare a positive electrode. The size of the part where the positive electrode mixture is applied is 12 cm x 15
cm, and the thickness was 250 μm on each side. The aluminum foil doesn't take much ears up and down, but 25m to the right on the left and right
It is designed so that the negative electrode mixture is applied while leaving a 3 mm left ear.
【００２９】尚、単電池の端の部分を構成する電極は正
極合剤を片面のみに塗布したもので、厚さは２５μｍ、
左に１５ｍｍ、右に２５ｍｍの耳のあるものを使用す
る。 （単電池の組立）上記の負極と正極を交互に２５μｍ厚
さの多孔性ポリプロピレンシートをセパレーター８とし
て挟んで積層して、単電池を組み立てる。その際、両端
の電極は電極合剤を片面のみ塗布したものを使用する。
左側の負極の耳の部分には非導電性のスペーサー７を各
負極の間に挟んで、右側の正極の耳の部分にも非導電性
のスペーサー７を各正極の間に挟んで、積層する。スペ
ーサー７は負極側、正極側各々縦方向に３ヶ所に挟み込
む。この場合、作業性を良くするために、電極の耳の部
分に非導電性のスペーサー７を接着したものを使用し、
積層する。It should be noted that the electrodes forming the end portion of the unit cell are obtained by applying the positive electrode mixture only on one surface and have a thickness of 25 μm.
Use one with 15 mm ears on the left and 25 mm on the right. (Assembly of Unit Cell) The above-mentioned negative electrode and positive electrode are alternately laminated to sandwich a porous polypropylene sheet having a thickness of 25 μm as a separator 8 to assemble a unit cell. At this time, the electrodes on both ends are prepared by applying the electrode mixture only on one surface.
Non-conductive spacers 7 are sandwiched between the negative electrodes on the left negative electrode ears, and non-conductive spacers 7 are also sandwiched on the right positive electrode ears between the positive electrodes. . The spacer 7 is sandwiched at three locations in the vertical direction on the negative electrode side and the positive electrode side. In this case, in order to improve workability, a non-conductive spacer 7 is adhered to the ear portion of the electrode,
Stack.
【００３０】次いで、負極の銅箔の耳の部分の端部を６
〜７枚束ね（図面は３枚束ねた例を示している。）、こ
れを２枚の銅製の細長い板（金属片）で挟み、銅箔の耳
の部分と２枚の銅製の細長い板の積層体に孔をあけ、リ
ベットを通し、かしめて締め付ける。次いで銅箔の耳の
部分の端部の先端と２枚の銅製の細長い板をこの端部の
先端の側からＴＩＣ溶接で溶接する。同様に、正極のア
ルミニウム箔の耳の部分の端部を６〜７枚束ね、これを
２枚のアルミニウム製の細長い板（金属片）で挟み、ア
ルミニウム箔の耳の部分と２枚のアルミニウム製の細い
板の積層体に孔をあけ、リベットを通し、かしめて締め
付ける。次いでアルミニウム箔の耳の部分の端部の先端
と２枚のアルミニウム製の細長い板をこの端部の先端の
側からＴＩＧ溶接で溶接する。単電池１個当たり、負
極、正極それぞれ４組（図面は２組の例を示してい
る。）の金属箔と金属片と溶接したものを作成する。こ
の金属片に金属棒を溶接し、負極及び正極を分離して別
々に（並列に）接続する。このようにして、負極と正
極、それぞれ別々に電気的に接続された集電体が形成さ
れる。Then, the end portion of the ear portion of the copper foil of the negative electrode is 6
~ 7 sheets are bundled (the drawing shows an example in which 3 sheets are bundled), sandwiched between two copper strips (metal pieces), and the copper foil ears and the two copper strips are separated. Drill holes in the stack, pass rivets, crimp and tighten. Then, the tip of the end of the ear portion of the copper foil and the two thin strips made of copper are welded by TIC welding from the side of the tip of this end. Similarly, 6 to 7 end portions of the ears of the aluminum foil of the positive electrode are bundled and sandwiched between two thin aluminum plates (metal pieces), and the ears of the aluminum foil and the two aluminum pieces are made. Make a hole in the stack of thin plates, insert a rivet, crimp and tighten. Next, the tip of the end of the ear portion of the aluminum foil and the two thin strips made of aluminum are welded by TIG welding from the side of the tip of this end. For each single cell, four sets of negative electrodes and four sets of positive electrodes (two sets are shown in the drawing) are welded to the metal foil and the metal piece, respectively, to prepare one. A metal rod is welded to this metal piece, and the negative electrode and the positive electrode are separated and connected separately (in parallel). In this way, the negative electrode and the positive electrode are separately connected to form a current collector.
【００３１】尚、単電池は積層する方向を非導電体の枠
を以て締め付ける。このようにして、強靱で、耐振動
性、耐衝撃性に優れた大容量のリチウムイオン二次電池
の単電池を作ることができる。上記の大きさの電極を２
６組と半分（両端の電極は片面のみ電極合剤が塗布して
あるので半分となる）積層すると、約３５０Ｗｈの充放
電容量を持った単電池となる。The unit cells are fastened in the stacking direction with a non-conductive frame. In this way, a large-capacity unit cell of a lithium ion secondary battery that is tough and has excellent vibration resistance and impact resistance can be manufactured. 2 electrodes of the above size
By stacking 6 pairs and half (the electrodes on both ends are half because the electrode mixture is applied on only one side), a single cell having a charge / discharge capacity of about 350 Wh is obtained.
【００３２】尚、単電池から電気を取り出す端子は、上
記金属片に溶接した金属棒で、この場合、単電池１個当
たり、負極、正極それぞれ４本（図面は２本の例を示し
ている。）となり、これらが電池の容器の上蓋から突き
出る形となり、上蓋の上で、４本を並列に接続する。The terminal for extracting electricity from the unit cell is a metal rod welded to the metal piece. In this case, each unit cell has four negative electrodes and four positive electrodes (the drawings show two examples). .), And these are projected from the top lid of the battery container, and four pieces are connected in parallel on the top lid.
【００３３】図５及び６は、このようにして得られたリ
チウムイオン二次電池の単電池を示す。図５は正面図
（図６のＡ断面）、図６は平面図（図５のＢ断面）であ
る。図中、１１は負極集電体金属箔、１２は負極端部集
電体金属箔、１１′，１１″は負極集電体金属箔の耳の
部分、１３は負極活物質合剤を示す。これらが負極を構
成する。１４は正極集電体金属箔、１５は正極端部集電
体金属箔、１４′，１４″は正極金属箔の耳の部分、１
６は正極活物質合剤を示す。これらが正極を構成する。
１７は負極及び正極の活物質合剤の塗布範囲を示す。FIGS. 5 and 6 show a lithium-ion secondary battery cell thus obtained. 5 is a front view (cross section A in FIG. 6), and FIG. 6 is a plan view (cross section B in FIG. 5). In the figure, 11 is a negative electrode current collector metal foil, 12 is a negative electrode end current collector metal foil, 11 'and 11''are ears of the negative electrode current collector metal foil, and 13 is a negative electrode active material mixture. These constitute a negative electrode. 14 is a positive electrode current collector metal foil, 15 is a positive electrode end current collector metal foil, 14 'and 14 "are ears of the positive electrode metal foil, 1
6 shows a positive electrode active material mixture. These constitute the positive electrode.
Reference numeral 17 denotes the application range of the active material mixture for the negative electrode and the positive electrode.
【００３４】なお、１２には、片面のみ負極活物質合剤
１３が塗布してあり、正極のスペーサーも締め付けられ
るような寸法となっている。１５には片面のみ正極活物
質合剤１６が塗布してあり、負極のスペーサーも締め付
けられるような寸法となっている。１８は負極集電体金
属片、４はリベット、１８′は１８と１１′の溶接部、
１９は正極集電体金属片、４はリベット、１９′は１９
と１４′の溶接部を示す。７は非導電性スペーサー、２
０は非導電性締め付け枠、２１は締め付けボルト、８は
セパレーターを示す。２２は単電池の負極端子、２３は
単電池の正極端子を示す。It is to be noted that the negative electrode active material mixture 13 is applied to only one side of the surface 12, and the size is such that the positive electrode spacer can be tightened. The positive electrode active material mixture 16 is applied to only one surface of the negative electrode 15, and the size of the negative electrode spacer 16 can be tightened. 18 is a metal piece for the negative electrode current collector, 4 is a rivet, 18 'is a welded portion between 18 and 11',
19 is a metal piece for the positive electrode current collector, 4 is a rivet, and 19 'is 19
And 14 'welds are shown. 7 is a non-conductive spacer, 2
0 is a non-conductive tightening frame, 21 is a tightening bolt, and 8 is a separator. Reference numeral 22 represents a negative electrode terminal of the single battery, and 23 represents a positive electrode terminal of the single battery.
【００３５】（組電池の組み立て）上記単電池１０個を
隔壁を備えたポリプロピレン製の容器に収納し、電解液
を注入して、上蓋を閉める。この時、上蓋を貫通して、
各単電池の負極の端子、正極の端子が容器の上部に突き
出した形となる。単電池１個当たり、負極の端子４本、
正極の端子４本、合計８０本の端子が突き出した形とな
る。この端子を上蓋の貫通部分で、適当な封止剤を以て
封止し、容器を密閉する。各単電池の端子を直列に端子
の連結金具（連結体）で接続し、カバーを取り付ける。(Assembly of battery pack) The above-mentioned 10 cells are placed in a polypropylene container having a partition wall, an electrolytic solution is injected, and the upper lid is closed. At this time, penetrate the upper lid,
The negative electrode terminal and the positive electrode terminal of each unit cell are projected to the upper part of the container. 4 negative electrode terminals per cell,
Four terminals of the positive electrode, a total of 80 terminals, are projected. The terminal is sealed with an appropriate sealant at the penetrating portion of the upper lid to seal the container. Connect the terminals of each cell in series with the terminal connection fittings (connector), and attach the cover.
【００３６】組電池全体の正極及び負極の端子は電槽の
横から電池の外に出す。（電槽の上から出すことも出来
る。） 尚、単電池の端子のある部屋には、外部から空気又は冷
媒を送って、電池の内部で発生した熱を放散する。The positive and negative terminals of the whole assembled battery are brought out of the battery from the side of the battery case. (It can also be discharged from the top of the battery case.) In addition, air or a refrigerant is sent from the outside to the room having the terminal of the unit cell to dissipate the heat generated inside the battery.
【００３７】図７〜９にこのようにして得られたリチウ
ムイオン二次電池の組電池を示す（図７は正面図、図８
は平面図、図９は側面図）。３２は単電池、３３は電槽
の本体、３４は電槽の上蓋、３５は電槽の端子部のカバ
ー、３６は電槽の内部の隔壁を示す。２２は単電池の負
極端子、２３は単電池の正極端子、３９は単電池間の連
結体、４０は組電池の負極端子、４１は組電池の正極端
子を示す。４２は電解液の液面を示す。４３，４４は単
電池の端子室の空気又は冷媒の入口及び出口を示す。電
解液はプロピレンカーボネートとデメトキシエタン１：
１の混合溶媒に６フッ化燐リチウム塩を１モル／Ｌ溶解
したものを使用する。このリチウムイオン二次電池の充
放電容量は３５００Ｗｈ、電池電圧は３５Ｖ、エネルギ
ー密度は１２５Ｗｈ／ｋｇである。7 to 9 show the assembled battery of the lithium ion secondary battery thus obtained (FIG. 7 is a front view, FIG. 8).
Is a plan view and FIG. 9 is a side view). Reference numeral 32 is a single cell, 33 is a main body of the battery case, 34 is an upper lid of the battery case, 35 is a cover of a terminal portion of the battery case, and 36 is a partition wall inside the battery case. Reference numeral 22 is a negative electrode terminal of the unit cell, 23 is a positive electrode terminal of the unit cell, 39 is a connecting body between the unit cells, 40 is a negative electrode terminal of the assembled battery, and 41 is a positive electrode terminal of the assembled battery. 42 indicates the liquid surface of the electrolytic solution. Reference numerals 43 and 44 denote inlets and outlets of air or refrigerant in the terminal chamber of the unit cell. The electrolyte is propylene carbonate and demethoxyethane 1:
A solution obtained by dissolving 1 mol / L of lithium hexafluorophosphate in the mixed solvent of 1 is used. The charge / discharge capacity of this lithium-ion secondary battery is 3500 Wh, the battery voltage is 35 V, and the energy density is 125 Wh / kg.
【００３８】[0038]
【発明の効果】本発明によれば、大型化に好適なリチウ
ムイオン二次電池を得ることができる。EFFECTS OF THE INVENTION According to the present invention, a lithium ion secondary battery suitable for upsizing can be obtained.
【図１】本発明における金属箔と金属片の溶接前の状態
（平面図）を示す。FIG. 1 shows a state (plan view) of a metal foil and a metal piece before welding in the present invention.
【図２】図１における溶接後の状態（平面図及び側面
図）を示す。FIG. 2 shows a state (a plan view and a side view) after welding in FIG.
【図３】本発明における金属箔と金属片を溶接する際
に、スリット型金属片を用いたときの溶接前の状態（正
面図、側面図及び平面図）を示す。FIG. 3 shows a state before welding (a front view, a side view and a plan view) when a slit type metal piece is used when welding a metal foil and a metal piece in the present invention.
【図４】図３における溶接後の状態（正面図、側面図及
び平面図）を示す。FIG. 4 shows a state (front view, side view, and plan view) after welding in FIG.
【図５】本発明におけるリチウムイオン電池の単電池の
一例を示す（正面図図６のＡ断面）。FIG. 5 shows an example of a single cell of the lithium-ion battery according to the present invention (front cross-section A in FIG. 6).
【図６】図５における平面図を示す（図５のＢ断面）。6 shows a plan view of FIG. 5 (B cross section of FIG. 5).
【図７】本発明におけるリチウムイオン電池の組電池の
一例を示す（正面図）。FIG. 7 shows an example of an assembled battery of a lithium ion battery according to the present invention (front view).
【図８】図７における平面図を示す。FIG. 8 shows a plan view of FIG.
【図９】図７における側面図を示す。FIG. 9 shows a side view in FIG.
１ 金属片 ２ 金属箔 ４ リベット ５ 溶接部 ７ 非導電性スペーサー ８ セパレーター ９ 電極活物質層 １３ 負極活物質合剤 １６ 正極活物質合剤 ２０ 非導電性締め付け枠 ２１ 締め付けボルト ２２ 単電池の負極端子 ２３ 単電池の正極端子 DESCRIPTION OF SYMBOLS 1 Metal piece 2 Metal foil 4 Rivet 5 Welding part 7 Non-conductive spacer 8 Separator 9 Electrode active material layer 13 Negative electrode active material mixture 16 Positive electrode active material mixture 20 Non-conducting tightening frame 21 Tightening bolt 22 Negative electrode terminal of single cell 23 Positive cell terminal
フロントページの続き (72)発明者 井上 実 新潟県上越市福田町１番地 三菱化成株式 会社直江津工場内 (72)発明者 小山 富一 新潟県上越市福田町１番地 三菱化成株式 会社直江津工場内Front Page Continuation (72) Minor Inoue 1 Fukuda-cho, Joetsu City, Niigata Prefecture Inside the Naoetsu Plant, Mitsubishi Kasei Co., Ltd. (72) Tomiichi Koyama 1 Fukuda-cho, Joetsu City, Niigata Prefecture Inside the Naoetsu Plant, Mitsubishi Kasei Co., Ltd.
Claims (6)
極と金属材料に負極活物質合剤を塗布した負極をセパレ
ーターを挟んで交互に積層する構造の単電池からなるリ
チウムイオン二次電池において、電極を多層積層し、電
極の金属材料の耳の部分を、正極及び負極に分離してそ
れぞれ導電体に電気的に接続し、集電体を形成するに当
たり、正極及び負極の金属材料の耳の部分を、分離して
それぞれ複数枚束ねて、この導電体で挟み、その電極の
耳の部分とこの導電体を機械的に締め付けて、集電体を
形成し、この導電体を通して電気を取り出すように構成
してなることを特徴とするリチウムイオン二次電池。1. A lithium ion secondary battery comprising a unit cell having a structure in which a positive electrode in which a positive electrode active material mixture is applied to a metal material and a negative electrode in which a negative electrode active material mixture is applied to a metal material are alternately laminated with a separator interposed therebetween. In, the electrodes are laminated in multiple layers, the ears of the metal material of the electrodes are separated into the positive electrode and the negative electrode and electrically connected to the conductors respectively, and when forming the current collector, the metal materials of the positive electrode and the negative electrode are Separate and bundle multiple ear parts, sandwich them with this conductor, mechanically tighten the ear part of this electrode and this conductor to form a current collector, and apply electricity through this conductor. A lithium-ion secondary battery, which is configured to be taken out.
に、リベットを通し、これをかしめて機械的に締め付け
る請求項１記載のリチウムイオン二次電池。2. The lithium-ion secondary battery according to claim 1, wherein a rivet is passed through the laminated body of the ears of the electrode sandwiched between the conductors, and the rivet is caulked and mechanically tightened.
る請求項１又は２記載のリチウムイオン二次電池。3. The lithium ion secondary battery according to claim 1, wherein an end portion of an ear portion of the electrode is welded to a conductor.
トガス）溶接、高周波溶接又は超音波溶接でなされた請
求項３記載のリチウムイオン二次電池。4. The lithium ion secondary battery according to claim 3, wherein the welding is performed by TIG (tungsten-inert gas) welding, high frequency welding or ultrasonic welding.
の耳の部分に電極間の間隔を規制するスペーサーが挟み
込まれた請求項１，２又は３記載のリチウムイオン二次
電池。5. The lithium ion secondary battery according to claim 1, wherein a spacer for controlling a gap between the electrodes is sandwiched between the ears of the metallic material of the electrodes when assembling the unit cell.
部分に接着したものを使用してなる請求項５記載のリチ
ウムイオン二次電池。6. The lithium ion secondary battery according to claim 5, wherein the spacer is made of a metal material which is previously bonded to the ear portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6220345A JPH0888021A (en) | 1994-09-14 | 1994-09-14 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6220345A JPH0888021A (en) | 1994-09-14 | 1994-09-14 | Lithium ion secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0888021A true JPH0888021A (en) | 1996-04-02 |
Family
ID=16749693
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6220345A Pending JPH0888021A (en) | 1994-09-14 | 1994-09-14 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0888021A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5995130A (en) * | 1995-08-11 | 1999-11-30 | Hitachi Koki Co., Ltd. | Laser beam scanning apparatus and method providing controllable print density |
| DE10100626B4 (en) * | 2000-01-10 | 2004-03-04 | Delphi Technologies, Inc., Troy | Lithium Ion Battery |
| FR2869463A1 (en) * | 2004-04-27 | 2005-10-28 | Cyril Bergeaud | Lithium-polymer storage batteries assembling system, has blocks with batteries connected to plates delimiting compartments, for connecting batteries with each other, where plates are fixed on sides to connect blocks |
| JP2013105672A (en) * | 2011-11-15 | 2013-05-30 | Toyota Industries Corp | Secondary battery, vehicle, and method for manufacturing secondary battery |
-
1994
- 1994-09-14 JP JP6220345A patent/JPH0888021A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5995130A (en) * | 1995-08-11 | 1999-11-30 | Hitachi Koki Co., Ltd. | Laser beam scanning apparatus and method providing controllable print density |
| DE10100626B4 (en) * | 2000-01-10 | 2004-03-04 | Delphi Technologies, Inc., Troy | Lithium Ion Battery |
| FR2869463A1 (en) * | 2004-04-27 | 2005-10-28 | Cyril Bergeaud | Lithium-polymer storage batteries assembling system, has blocks with batteries connected to plates delimiting compartments, for connecting batteries with each other, where plates are fixed on sides to connect blocks |
| JP2013105672A (en) * | 2011-11-15 | 2013-05-30 | Toyota Industries Corp | Secondary battery, vehicle, and method for manufacturing secondary battery |
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