JPH07263029A - Lithium ion secondary battery - Google Patents
Lithium ion secondary batteryInfo
- Publication number
- JPH07263029A JPH07263029A JP6055953A JP5595394A JPH07263029A JP H07263029 A JPH07263029 A JP H07263029A JP 6055953 A JP6055953 A JP 6055953A JP 5595394 A JP5595394 A JP 5595394A JP H07263029 A JPH07263029 A JP H07263029A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- negative electrode
- positive electrode
- parts
- secondary battery
- 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
Landscapes
- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
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の
端部とこの導電体を溶接して、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たことを特徴
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 respective conductors, In forming the ears of the positive and negative metal material, separate and bundle a plurality of each, sandwiched by this conductor, weld the end of the ears of the electrode and this conductor, A lithium ion secondary battery is characterized in that a current collector is formed and electricity is taken out through this 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, LixMn2OFour,
LixV2OFive, LixTiS2Etc. 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の端部とこの導電
体を溶接して、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 metal material of the positive electrode and the negative electrode, bundle a plurality of them, sandwich them with this conductor, and weld the end of the ears of the electrode and this conductor to form a current collector. And is configured to draw electricity through the conductor.
【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。上記の電極の耳の部分の端部とこれらの導電体の接
続を、溶接して集電体が形成される。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. The ends of the electrode ears and the connections between these conductors are welded to form a current collector.
【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、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 welding, for example, as shown in FIG. 1, two metal pieces 1 are sandwiched with the end portions of the ear portions of the bundled electrodes from both sides, and as shown in FIG. It is carried out by welding two metal pieces 1 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は溶接部、５は端子の金属片３と金属片１の溶接部、
６は非導電性スペーサー、７はセパレーター、８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９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、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,
4 is a welded portion, 5 is a welded portion of the metal piece 3 and the metal piece 1 of the terminal,
6 is a non-conductive spacer, 7 is a separator, and 8 is an electrode active material layer. The shape of the two metal pieces is such that the end portions of the ear portions of the bundled electrodes are sandwiched from both sides and the same effect as welding of the two metal pieces sandwiched between the tip of the end portions is welded. For example, as shown in FIG. 3, a slit 9 is opened in the metal piece 1 that is integrated with the metal piece 3 of the terminal, and as shown in FIG. It is also possible that the tip of this end and the slit of the metal piece are welded from the side of the tip of this end through the end.
【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１ｍｍ弱から１．５ｍｍ程度であるので、５〜１０
枚束ねるとすると、その電極等の層の厚みは５〜１５ｍ
ｍとなる。従って、単電池の電極等の層の厚さが４０ｍ
ｍ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,
3 to 30 sheets, preferably 5 to 10 sheets, are bundled and sandwiched between two metal pieces, and the tip of the end of the electrode's ear portion and the two metal pieces are welded from the side of the tip of this end. Then, a current collector is formed. 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:
Since it is usually less than 1 mm to about 1.5 mm, 5-10
If the sheets are bundled, the thickness of the layers such as the electrodes is 5 to 15 m.
m. Therefore, the thickness of the layers such as the electrodes of the unit cell is 40 m.
In the case of about m, the positive electrode and the negative electrode will collect current with about 4 sets of metal pieces.
【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メチルピロリドンに溶解したもの（２ｗｔ％濃
度）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１
２ｃｍ×１５ｃｍ、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２５ｍ
ｍ、右に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。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２０μ
ｍ、左に２５ｍｍ、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 was mixed with that dissolved in N-methylpyrrolidone (2 wt% concentration) to form a negative electrode mixture slurry, which was coated on both sides of a 20 μm thick copper foil, dried to evaporate the solvent, and subjected to roll treatment to form a negative electrode. make. The size of the negative electrode mixture application part is 1
The size was 2 cm × 15 cm, and the thickness was 250 μm on each side. The copper foil doesn't take much ears up and down, but to the left and right, 25m to the left
It is designed so that the negative electrode mixture is applied while leaving a 3 mm ear on the right side. In addition, the electrodes forming the end portions of the unit cells were prepared by coating the negative electrode mixture only on one surface and had a thickness of 20 μm.
m, with 25 mm on the left and 15 mm 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
ピロリドンに溶解したもの（２ｗｔ％濃度）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１２ｃ
ｍ×１５ｃｍ、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
２５ｍｍ、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
To 0 parts, as a conductive agent, 5 parts of acetylene black was added and mixed, and mixed with 5 parts of polyvinylidene fluoride dissolved in N-methylpyrrolidone (2 wt% concentration),
A positive electrode mixture slurry is applied to both sides of an aluminum foil having a thickness of 25 μm, dried to evaporate the solvent, and roll-processed to produce a positive electrode. The size of the positive electrode mixture application part is 12c
m × 15 cm, and the thickness was 250 μm on each side. The aluminum foil is designed so that the negative electrode mixture is applied on the left and right, leaving 25 mm on the right side and 3 mm on the left side, although the upper and lower ears are not particularly noticeable.
【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７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６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６を各正極の間に挟んで、積層する。スペ
ーサー６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６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 7, and a unit cell is assembled. At this time, the electrodes on both ends are prepared by applying the electrode mixture only on one surface.
Non-conductive spacers 6 are sandwiched between the negative electrodes on the left negative electrode ears, and non-conductive spacers 6 are sandwiched on the right positive electrode ears between the positive electrodes. . The spacer 6 is sandwiched in three places in the vertical direction on each of the negative electrode side and the positive electrode side. In this case, in order to improve workability, a non-conductive spacer 6 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 tip of the end of the ear portion of the copper foil and two sheets of copper foil. An elongated plate made of copper is welded by TIC welding from the tip side of this end. Similarly, 6 to 7 end portions of the ears of the aluminum foil of the positive electrode are bundled, and this is sandwiched between two thin aluminum plates (metal pieces),
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、１０は負極集電体金属箔、１１は負極端部集
電体金属箔、１０′，１０″は負極集電体金属箔の耳の
部分、１２は負極活物質合剤を示す。これらが負極を構
成する。１３は正極集電体金属箔、１４は正極端部集電
体金属箔、１３′，１３″は正極金属箔の耳の部分、１
５は正極活物質合剤を示す。これらが正極を構成する。
１６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, 10 is a negative electrode current collector metal foil, 11 is a negative electrode end current collector metal foil, 10 'and 10 "are ears of the negative electrode current collector metal foil, and 12 is a negative electrode active material mixture. These constitute a negative electrode, 13 is a positive electrode current collector metal foil, 14 is a positive electrode end current collector metal foil, 13 'and 13 "are ears of the positive electrode metal foil, 1
5 shows a positive electrode active material mixture. These constitute the positive electrode.
Reference numeral 16 indicates a coating range of the active material mixture of the negative electrode and the positive electrode.
【００３４】尚、１１には、片面のみ負極活物質合剤１
２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。１４には片面のみ正極活物質
合剤１５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。１７は負極集電体金属
片、１７′は１７と１０′の溶接部、１８は正極集電体
金属片、１８′は１８と１３′の溶接部を示す。６は非
導電性スペーサー、１９は非導電性締め付け枠、２０は
締め付けボルト、７はセパレーターを示す。２１は単電
池の負極端子、２２は単電池の正極端子を示す。Reference numeral 11 indicates a negative electrode active material mixture 1 on only one side.
2 is applied, and the dimensions are such that the positive electrode spacer can also be tightened. The positive electrode active material mixture 15 is applied to only one surface of the negative electrode 14, and the size is such that the negative electrode spacer can be tightened. Reference numeral 17 denotes a negative electrode current collector metal piece, 17 'denotes a welded portion between 17 and 10', 18 denotes a positive electrode current collector metal piece, and 18 'denotes a welded portion between 18 and 13'. 6 is a non-conductive spacer, 19 is a non-conductive tightening frame, 20 is a tightening bolt, and 7 is a separator. Reference numeral 21 indicates a negative electrode terminal of the single battery, and 22 indicates 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
又は水を送って、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 taken out from the battery case.) In addition, air or water is sent from the outside to the room with the terminal of the single battery 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）。３１は単電池、３２は電槽
の本体、３３は電槽の上蓋、３４は電槽の端子部のカバ
ー、３５は電槽の内部の隔壁を示す。２１は単電池の負
極端子、２２は単電池の正極端子、３８は単電池間の連
結体、３９は組電池の負極端子、４０は組電池の正極端
子を示す。４１は電解液の液面を示す。４２，４３は単
電池の端子室の空気又は水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 31 is a single cell, 32 is a body of the battery case, 33 is an upper lid of the battery case, 34 is a cover of the terminal portion of the battery case, and 35 is a partition wall inside the battery case. Reference numeral 21 is a negative electrode terminal of the single battery, 22 is a positive electrode terminal of the single battery, 38 is a connecting body between the single batteries, 39 is a negative electrode terminal of the assembled battery, and 40 is a positive electrode terminal of the assembled battery. 41 shows the liquid level of the electrolytic solution. Reference numerals 42 and 43 denote inlets and outlets of air or water in the terminal chamber of the unit cell. The electrolyte is propylene carbonate and demethoxyethane 1: 1.
A solution obtained by dissolving 1 mol / L of lithium hexafluorophosphate in the mixed solvent of 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 溶接部 ６ 非導電性スペーサー ７ セパレーター ８ 電極活物質層 １２ 負極活物質合剤 １５ 正極活物質合剤 １９ 非導電性締め付け枠 ２０ 締め付けボルト ２１ 単電池の負極端子 ２２ 単電池の正極端子 DESCRIPTION OF SYMBOLS 1 Metal piece 2 Metal foil 4 Welding portion 6 Non-conductive spacer 7 Separator 8 Electrode active material layer 12 Negative electrode active material mixture 15 Positive electrode active material mixture 19 Non-conductive tightening frame 20 Tightening bolt 21 Negative electrode terminal 22 of single cell 22 Single Battery positive 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Minor Inoue 1 Fukuda-cho, Joetsu City, Niigata Prefecture Naoetsu Plant, Mitsubishi Kasei Co., Ltd. (72) Tomiichi Koyama 1 Fukuda-cho, Joetsu City, Niigata Mitsubishi Kasei Co., Ltd. in the factory
Claims (4)
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
耳の部分の端部とこの導電体を溶接して、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た
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 the ear parts and bundle them together, sandwich them with this conductor, and weld the end of the electrode ear part and this conductor to form a current collector. A lithium-ion secondary battery characterized in that it is configured to take out.
が、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でなされた請求項１記載のリチウ
ム二次電池。2. The lithium secondary battery according to claim 1, wherein welding of the end portion of the ear portion of the electrode and the conductor 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記載のリチウム二次電池。3. The lithium secondary battery according to claim 1, wherein a spacer that restricts a gap between the electrodes is sandwiched between the ears of the metallic material of the electrodes when the unit cell is assembled.
部分に接着したものを使用してなる請求項３記載のリチ
ウム二次電池。4. The lithium secondary battery according to claim 3, wherein the spacer is made of a metal material which is previously bonded to the ears.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6055953A JPH07263029A (en) | 1994-03-25 | 1994-03-25 | Lithium ion secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6055953A JPH07263029A (en) | 1994-03-25 | 1994-03-25 | Lithium ion secondary battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07263029A true JPH07263029A (en) | 1995-10-13 |
Family
ID=13013445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6055953A Pending JPH07263029A (en) | 1994-03-25 | 1994-03-25 | Lithium ion secondary battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07263029A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999031746A1 (en) * | 1997-12-18 | 1999-06-24 | Mitsubishi Denki Kabushiki Kaisha | Nonaqueous battery electrode and battery using the electrode |
| JPH11274004A (en) * | 1998-03-23 | 1999-10-08 | Asahi Glass Co Ltd | Electrochemical element |
| KR100589391B1 (en) * | 2004-03-30 | 2006-06-14 | 삼성에스디아이 주식회사 | Electrodes assembly and secondary battery using the same |
| JP2006324333A (en) * | 2005-05-17 | 2006-11-30 | Honda Motor Co Ltd | Electrochemical element |
| US7489497B2 (en) | 2005-12-15 | 2009-02-10 | Tdk Corporation | Electrochemical device |
| US8337572B2 (en) | 2008-06-17 | 2012-12-25 | Panasonic Corporation | Battery and method for producing the same |
| WO2020075966A1 (en) * | 2018-10-10 | 2020-04-16 | 주식회사 엘지화학 | Bus bar frame assembly method |
| CN113258076A (en) * | 2021-04-27 | 2021-08-13 | 恒大新能源技术(深圳)有限公司 | Metal lithium cathode, preparation method thereof and lithium ion battery |
-
1994
- 1994-03-25 JP JP6055953A patent/JPH07263029A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999031746A1 (en) * | 1997-12-18 | 1999-06-24 | Mitsubishi Denki Kabushiki Kaisha | Nonaqueous battery electrode and battery using the electrode |
| JPH11274004A (en) * | 1998-03-23 | 1999-10-08 | Asahi Glass Co Ltd | Electrochemical element |
| KR100589391B1 (en) * | 2004-03-30 | 2006-06-14 | 삼성에스디아이 주식회사 | Electrodes assembly and secondary battery using the same |
| JP2006324333A (en) * | 2005-05-17 | 2006-11-30 | Honda Motor Co Ltd | Electrochemical element |
| JP4658683B2 (en) * | 2005-05-17 | 2011-03-23 | 本田技研工業株式会社 | Electrochemical element |
| US7489497B2 (en) | 2005-12-15 | 2009-02-10 | Tdk Corporation | Electrochemical device |
| US8337572B2 (en) | 2008-06-17 | 2012-12-25 | Panasonic Corporation | Battery and method for producing the same |
| WO2020075966A1 (en) * | 2018-10-10 | 2020-04-16 | 주식회사 엘지화학 | Bus bar frame assembly method |
| JP2021530080A (en) * | 2018-10-10 | 2021-11-04 | エルジー・ケム・リミテッド | Busbar frame assembly method |
| US11962039B2 (en) | 2018-10-10 | 2024-04-16 | Lg Energy Solution, Ltd. | Mounting method of bus-bar frame |
| CN113258076A (en) * | 2021-04-27 | 2021-08-13 | 恒大新能源技术(深圳)有限公司 | Metal lithium cathode, preparation method thereof and lithium ion battery |
| CN113258076B (en) * | 2021-04-27 | 2022-06-24 | 恒大新能源技术(深圳)有限公司 | Metal lithium cathode, preparation method thereof and lithium ion battery |
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