JP2003282044A - Secondary battery - Google Patents
Secondary batteryInfo
- Publication number
- JP2003282044A JP2003282044A JP2002084941A JP2002084941A JP2003282044A JP 2003282044 A JP2003282044 A JP 2003282044A JP 2002084941 A JP2002084941 A JP 2002084941A JP 2002084941 A JP2002084941 A JP 2002084941A JP 2003282044 A JP2003282044 A JP 2003282044A
- Authority
- JP
- Japan
- Prior art keywords
- positive electrode
- electrode current
- current collecting
- current collector
- positive
- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、二次電池に係り、
特に、金属箔からなる集電体が集電部材の側面に沿って
配置・溶接された二次電池に関する。TECHNICAL FIELD The present invention relates to a secondary battery,
In particular, the present invention relates to a secondary battery in which a current collector made of metal foil is arranged and welded along the side surface of a current collecting member.
【０００２】[0002]
【従来の技術】従来、一般に広く用いられている溶接に
は、ガス溶接、アーク溶接、レーザビーム溶接、スポッ
ト溶接、超音波圧接などがある。二次電池、特に金属箔
を集電体として用いる二次電池においては、集電体と集
電部材との溶接にはスポット溶接や超音波圧接を用いた
ものが主流である。このような二次電池において、集電
体と集電部材との接合にスポット溶接を使用する場合に
は、集電体の厚さが５０μｍ以上の比較的厚いものを使
用し、かつ集電体が単数からなっていることが多い。一
方、集電体と集電部材との接合に超音波圧接を使用する
場合に、集電体の厚さが比較的厚いときには、単数の集
電体を接合することが主流であり、集電体の厚さが５０
μｍ以下の比較的薄いときには、複数の集電体を接合す
ることが主流である。2. Description of the Related Art Conventionally and widely used welding includes gas welding, arc welding, laser beam welding, spot welding and ultrasonic pressure welding. In a secondary battery, especially a secondary battery using a metal foil as a current collector, spot welding or ultrasonic pressure welding is mainly used for welding the current collector and the current collecting member. In such a secondary battery, when spot welding is used to join the current collector and the current collector, a current collector having a relatively large thickness of 50 μm or more is used, and the current collector is used. Are often singular. On the other hand, when ultrasonic pressure welding is used to join the current collector and the current collector, when the thickness of the current collector is relatively large, it is the mainstream to join a single current collector. Body thickness is 50
When the thickness is less than μm and is relatively thin, it is mainstream to join a plurality of current collectors.
【０００３】特に、大容量のリチウム二次電池では、集
電性能を向上させるために電極面積が広く、集電体から
導出されたタブ状集電体が多数となり、一度の溶接で複
数の集電体を溶接する必要があるため、集電体と集電部
材との溶接には超音波圧接を使用することが一般的であ
る。Particularly, in a large-capacity lithium secondary battery, the electrode area is large in order to improve the current collecting performance, the number of tab-shaped current collectors derived from the current collector is large, and a plurality of current collectors can be welded once. Since it is necessary to weld the current collector, ultrasonic welding is generally used for welding the current collector and the current collector member.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記複
数の金属箔集電体を超音波圧接により溶接する場合に、
一度に溶接される集電体本数の増加に伴って、集電体の
加圧力や印加エネルギーを大きくする必要がある。加圧
力や印加エネルギーを大きくすると、厚さ５０μｍ以下
の金属箔は、突刺強度や引っ張り強度などが小さいた
め、集電部材に集電体が溶接される溶接部で亀裂や破断
が生じたり、溶接部に印加された超音波振動が集電体の
溶接部以外の部分に伝わり、集電体の特に集電部材の角
部と接触している部分で亀裂や破断が生ずる、という問
題があった。溶接部での亀裂や破断は、集電体と溶接機
の溶接端子との間に保護材を介することにより防止する
ことができるが、配置した保護材の角部と集電体との接
触部で亀裂や破断が生ずる、という新たな問題がある。However, when welding the plurality of metal foil current collectors by ultrasonic pressure welding,
As the number of current collectors welded at once increases, it is necessary to increase the pressing force and applied energy of the current collectors. When the applied pressure or applied energy is increased, the metal foil having a thickness of 50 μm or less has small puncture strength, tensile strength, etc., and therefore cracks or fractures may occur at the welded portion where the current collector is welded to the current collector member, There was a problem that the ultrasonic vibration applied to the part was transmitted to the part of the current collector other than the welded part, and cracks and fractures occurred especially in the part of the current collector that was in contact with the corners of the current collector. . Cracks and breaks in the weld can be prevented by interposing a protective material between the current collector and the welding terminal of the welding machine, but the contact portion between the corner of the placed protective material and the current collector. There is a new problem that cracks and fractures occur at.
【０００５】本発明は上記事案に鑑み、生産性かつ集電
性能に優れた二次電池を提供することを課題とする。In view of the above problems, it is an object of the present invention to provide a secondary battery having excellent productivity and current collecting performance.
【０００６】[0006]
【課題を解決するための手段】上記課題を解決するため
に、本発明は、金属箔からなる集電体が集電部材の側面
に沿って配置・溶接された二次電池であって、前記集電
部材の前記集電体が沿う角部は、面取り又はＲ付けされ
ている。In order to solve the above problems, the present invention relates to a secondary battery in which a current collector made of a metal foil is arranged and welded along a side surface of a current collecting member. The corner of the current collecting member along which the current collector extends is chamfered or rounded.
【０００７】金属箔からなる集電体が集電部材の側面に
沿って配置・溶接されるときに、集電体は集電部材の角
部に接触する。本発明では、集電部材の集電体が沿う角
部が面取り又はＲ付けされているので、集電部材の集電
体が沿う角部との接触による集電体の損傷の発生を抑制
でき、集電体に亀裂又は破断が生ずることを防止するこ
とができる。When the current collector made of metal foil is arranged and welded along the side surface of the current collector, the current collector comes into contact with the corners of the current collector. In the present invention, since the corner portion of the current collecting member along which the current collector extends is chamfered or rounded, the occurrence of damage to the current collector due to contact with the corner portion along which the current collector of the current collecting member follows can be suppressed. It is possible to prevent the current collector from cracking or breaking.
【０００８】この場合において、集電体には、アルミニ
ウム箔又は銅箔を用いることが好ましく、更に、集電体
の厚さが２０μｍ以下のときは、集電体が薄く亀裂又は
破断が生じやすいので、集電体が沿う角部が面取り又は
Ｒ付けされていることが好ましい。また、集電部材及び
集電体の超音波圧接時に、集電体を保護するように集電
体の最外側面に沿って保護材を配置し、最外側面側の集
電体に亀裂又は破断が生ずることを防止するために、保
護材の集電体が沿う角部を面取り又はＲ付けすることが
より好ましい。In this case, it is preferable to use an aluminum foil or a copper foil for the current collector. Further, when the thickness of the current collector is 20 μm or less, the current collector is thin and cracks or breakage easily occur. Therefore, it is preferable that the corners along which the current collector extends are chamfered or rounded. Further, during ultrasonic pressure contact of the current collector and the current collector, a protective material is arranged along the outermost surface of the current collector to protect the current collector, and the current collector on the outermost surface side is cracked or In order to prevent breakage, it is more preferable to chamfer or round the corners along which the current collector of the protective material extends.
【０００９】[0009]
【発明の実施の形態】（第１実施形態）以下、図面を参
照して、本発明を角型リチウム二次電池に適用した第１
の実施の形態について、電池の作製手順に従って説明す
る。BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) Hereinafter, with reference to the drawings, a first embodiment in which the present invention is applied to a prismatic lithium secondary battery
The embodiment will be described in accordance with a battery manufacturing procedure.
【００１０】（正、負極板の作製）図１に示すように、
正極活物質としてリチウムマンガン複酸化物粉末と、導
電剤として鱗片状黒鉛と、結着剤としてポリフッ化ビニ
リデンとを例えば８６：９：５などの所定重量比で配合
し、これに分散溶媒としてＮ−メチルピロリドンを添
加、混練して正極スラリとした。正極スラリを厚さ３０
μｍ以下のニッケル箔やアルミニウム箔などの正極集電
体の両面に塗布し、その後、乾燥、プレス、裁断して所
定寸法の正極板を得た。なお、正極板の一端には、集電
のための矩形状の正極集電タブ２を形成した。(Production of Positive and Negative Electrode Plates) As shown in FIG.
Lithium-manganese mixed oxide powder as a positive electrode active material, scaly graphite as a conductive agent, and polyvinylidene fluoride as a binder were mixed at a predetermined weight ratio such as 86: 9: 5, and N was added as a dispersion solvent. -Methylpyrrolidone was added and kneaded to obtain a positive electrode slurry. Thickness of positive electrode slurry is 30
A positive electrode current collector having a thickness of μm or less, such as a nickel foil or an aluminum foil, was coated on both surfaces, and then dried, pressed, and cut to obtain a positive electrode plate having a predetermined size. A rectangular positive electrode current collecting tab 2 for current collection was formed at one end of the positive electrode plate.
【００１１】一方、負極活物質として炭素粉末と、結着
剤としてポリフッ化ビニリデンとを例えば９２：８など
の所定重量比で配合し、これに添加剤としてカーボンブ
ラックを、固形分中の割合（重量％）が５重量％になる
ように添加し、分散溶媒としてＮ−メチルピロリドンを
添加、混練して正極スラリとした。正極スラリを厚さ３
０μｍ以下の銅箔などの負極集電体の両面に塗布し、そ
の後、乾燥、プレス、裁断して所定寸法の負極板を得
た。なお、負極板の一端には、集電のための矩形状の負
極集電タブを形成した。On the other hand, carbon powder as a negative electrode active material and polyvinylidene fluoride as a binder are mixed at a predetermined weight ratio of, for example, 92: 8, and carbon black as an additive is added to this in a proportion of solid content ( (% By weight) to be 5% by weight, N-methylpyrrolidone was added as a dispersion solvent and kneaded to obtain a positive electrode slurry. Positive electrode slurry thickness 3
A negative electrode current collector such as a copper foil having a thickness of 0 μm or less was coated on both sides, and then dried, pressed and cut to obtain a negative electrode plate having a predetermined size. In addition, a rectangular negative electrode current collecting tab for current collection was formed at one end of the negative electrode plate.
【００１２】（電池の作製）上記のように作製した正極
板と負極板とをそれぞれ５０枚、５１枚使用して、正極
板と負極板とを厚さ４０μｍのポリエチレン製セパレー
タを介して交互に積層し積層体１を得た。このとき、積
層体１の上面の一方に正極集電タブを、他方に負極集電
タブを集合させて正極板及び負極板を配設した。(Production of Battery) Using 50 and 51 positive electrode plates and 51 negative electrode plates respectively prepared as described above, the positive electrode plate and the negative electrode plate are alternately placed through a polyethylene separator having a thickness of 40 μm. Layered to obtain a layered product 1. At this time, the positive electrode current collecting tabs were assembled on one side of the upper surface of the laminate 1, and the negative electrode current collecting tabs were assembled on the other side to arrange the positive electrode plate and the negative electrode plate.
【００１３】次に、正極集電タブ２と、正極外部端子５
との溶接について詳述する。正極外部端子５は、正極集
電タブ２と同一材質で上部側にネジが螺設されており、
下部側に断面略矩形状の正極集電体接合部５ａが突出し
た形状を有している。まず、５０枚の正極集電タブ２を
枚数がほぼ同数となるように図１に示す側面方向で左右
２つに集合させて積層し、積層体１の上部に突出した左
右２つの正極集電タブ積層部を形成した。次に、右側の
正極集電タブ積層部の内側（正極集電体接合部５ａの
側）の側面に沿うように、正極集電タブ２と同一材質で
正極集電タブ２が沿う角部が面取りされた正極集電部材
面取り部４ａを有する正極集電部材４を配置すると共
に、右側の正極集電タブ積層部の最外側面に沿うよう
に、正極集電タブ２と同一材質で正極集電タブ積層部の
最外側面を保護する板状の保護材３を配置した。そし
て、正極集電部材４の更に内側にアンビルを、保護材３
の更に外側に超音波溶接端子をそれぞれ配設して、正極
集電部材４、右側の正極集電タブ積層部及び保護材３を
超音波圧接し、左側の正極集電タブ積層部も同様に超音
波圧接して電極群を得た。なお、正極集電部材４と同形
状で銅製の負極集電部材、負極板から導出された銅箔の
負極集電タブ及び銅製で板状の保護材の超音波圧接も同
様に行った。Next, the positive electrode current collector tab 2 and the positive electrode external terminal 5
Weld in detail. The positive electrode external terminal 5 is made of the same material as the positive electrode current collecting tab 2 and has a screw screwed on the upper side,
The positive electrode current collector joining portion 5a having a substantially rectangular cross section has a protruding shape on the lower side. First, 50 positive electrode current collector tabs 2 are gathered in a lateral direction as shown in FIG. The tab laminated portion was formed. Next, a corner portion along which the positive electrode current collector tab 2 extends is made of the same material as the positive electrode current collector tab 2 so as to extend along the inner side surface (on the side of the positive electrode current collector joining portion 5a) of the positive electrode current collector tab laminated portion on the right side. The positive electrode current collecting member 4 having the chamfered positive electrode current collecting member chamfered portion 4a is arranged, and the positive electrode current collecting tab 2 is made of the same material as the positive electrode current collecting tab 2 along the outermost surface of the right positive electrode current collecting tab laminated portion. A plate-shaped protective member 3 for protecting the outermost surface of the electric tab laminated portion was arranged. Then, an anvil is provided inside the positive electrode current collecting member 4 and the protective material 3
The ultrasonic welding terminals are respectively disposed further outside, and the positive electrode current collecting member 4, the right side positive electrode current collecting tab laminated portion and the protective material 3 are ultrasonically pressure-welded, and the left side positive electrode current collecting tab laminated portion is similarly subjected. The electrode group was obtained by ultrasonic pressure contact. Note that the copper negative electrode current collector member having the same shape as the positive electrode current collector member 4, the negative electrode current collector tab of the copper foil led out from the negative electrode plate, and the copper plate-shaped protective material were also ultrasonically welded in the same manner.
【００１４】次に、正極集電体接合部５ａの両側面に、
正極集電タブ積層部が超音波圧接された正極集電部材４
を配設して、それぞれ正極集電体接合部５ａの側面と正
極集電部材４とを溶接した。なお、負極集電部材と、正
極外部端子５と同形状で銅製の負極外部端子とも同様に
溶接した。Next, on both side surfaces of the positive electrode collector joint portion 5a,
The positive electrode current collecting member 4 in which the positive electrode current collecting tab laminated portion is ultrasonically pressure-welded
And the side surface of the positive electrode current collector joining portion 5a and the positive electrode current collector member 4 were welded to each other. The negative electrode current collecting member and the negative electrode external terminal made of copper and having the same shape as the positive electrode external terminal 5 were similarly welded.
【００１５】従って、正極外部端子５の下部側の正極集
電体接合部５ａの両外側面に、正極集電部材面取り部４
ａを有する正極集電部材４がそれぞれ溶接されて配設さ
れており、正極集電部材面取り部４ａは正極集電タブ２
側の下端部に形成されている。また、正極集電部材４の
外側面に沿って、正極集電タブ２が積層された正極集電
タブ積層部が、超音波圧接されて配設されている。更
に、正極集電タブ積層部の最外側面に、板状の保護材３
が、超音波圧接されて配設されている。これのため、正
極外部端子５と正極板とは導通されている。なお、それ
ぞれ負極外部端子、負極集電部材、負極集電タブ及び保
護材も同様に導通されている。Therefore, the positive electrode current collecting member chamfered portion 4 is formed on both outer surfaces of the positive electrode current collector joining portion 5a on the lower side of the positive electrode external terminal 5.
The positive electrode current collecting members 4 having a are respectively welded and arranged, and the positive electrode current collecting member chamfered portion 4 a is provided in the positive electrode current collecting tab 2
Is formed at the lower end of the side. Further, along the outer surface of the positive electrode current collecting member 4, a positive electrode current collecting tab laminated portion in which the positive electrode current collecting tabs 2 are laminated is disposed by ultrasonic pressure contact. Further, a plate-shaped protective material 3 is provided on the outermost surface of the positive electrode current collector tab laminated portion.
, Are arranged in pressure contact with ultrasonic waves. Therefore, the positive electrode external terminal 5 and the positive electrode plate are electrically connected. In addition, the negative electrode external terminal, the negative electrode current collecting member, the negative electrode current collecting tab, and the protective material are also electrically connected.
【００１６】（電池の組立）正極外部端子５に薄い円環
状の下パッキン８を介して電池蓋６を当接載置し、更
に、電池蓋６に薄い円環状の上パッキン７を当接載置
し、上パッキン７を歯付きワッシャ９を介してナット１
０を締め付けて、電池蓋６に正極外部端子５を固定し
た。負極外部端子も同様に電池蓋６に固定した。上パッ
キン７及び下パッキン８を介在させることにより、正、
負極外部端子と電池蓋６との絶縁性を確保した。その
後、電池蓋６に固定された電極群を角型の電池缶１１に
挿入し、電池蓋６と電池缶１１とを溶接し、電解液を所
定量注入後、液口栓により注液口を封口することにより
角型リチウム二次電池２０を得た。なお、電解液には、
エチレンカーボネート（ＥＣ）とジメチルカーボネート
（ＤＭＣ）の混合溶液中に６フッ化リン酸リチウム（Ｌ
ｉＰＦ６）を１モル／リットル溶解したものを用いた。(Assembly of Battery) The battery lid 6 is placed on the positive electrode external terminal 5 through the thin annular lower packing 8, and the thin annular upper packing 7 is placed on the battery lid 6. The upper packing 7 through the toothed washer 9 and the nut 1
0 was tightened to fix the positive electrode external terminal 5 to the battery lid 6. The negative electrode external terminal was similarly fixed to the battery lid 6. By interposing the upper packing 7 and the lower packing 8,
The insulation between the negative electrode external terminal and the battery lid 6 was ensured. After that, the electrode group fixed to the battery lid 6 is inserted into the rectangular battery can 11, the battery lid 6 and the battery can 11 are welded, a predetermined amount of electrolytic solution is injected, and then the injection port is opened by the liquid port plug. A rectangular lithium secondary battery 20 was obtained by sealing. The electrolyte contains
In a mixed solution of ethylene carbonate (EC) and dimethyl carbonate (DMC), lithium hexafluorophosphate (L
iPF 6 ) was used at a concentration of 1 mol / liter.
【００１７】（作用）次に、本実施形態の角型リチウム
二次電池２０の作用等について説明する。(Operation) Next, the operation of the prismatic lithium secondary battery 20 of this embodiment will be described.
【００１８】本実施形態の角型リチウム二次電池２０で
は、ニッケル箔又はアルミニウム箔の正極集電タブ２が
正極集電部材４の側面に沿って超音波圧接されるとき
に、正極集電タブ２は正極集電部材４の角部に接触す
る。本実施形態の電池では、正極集電部材４が正極集電
部材面取り部４ａを有しているので、超音波圧接時に正
極集電タブ２が正極集電部材面取り部４ａに接触しても
正極集電タブ２の損傷の発生を抑制でき、正極集電タブ
２に亀裂又は破断が生ずることを防止することができ
る。なお、負極集電タブの亀裂又は破断も同様に抑制す
るこができる。従って、正、負極集電タブの亀裂又は破
断が抑制されるので、生産性かつ集電性能に優れた電池
を得ることができる。In the prismatic lithium secondary battery 20 of the present embodiment, when the positive electrode current collector tab 2 of nickel foil or aluminum foil is ultrasonically pressure contacted along the side surface of the positive electrode current collector member 4, the positive electrode current collector tab 2 is formed. 2 contacts the corner of the positive electrode current collecting member 4. In the battery of this embodiment, since the positive electrode current collecting member 4 has the positive electrode current collecting member chamfered portion 4a, even if the positive electrode current collecting tab 2 contacts the positive electrode current collecting member chamfered portion 4a during ultrasonic pressure welding, It is possible to suppress the occurrence of damage to the current collecting tab 2 and prevent the positive electrode current collecting tab 2 from cracking or breaking. It should be noted that cracking or breakage of the negative electrode current collecting tab can be similarly suppressed. Therefore, cracking or breakage of the positive and negative electrode current collecting tabs is suppressed, and thus a battery having excellent productivity and current collecting performance can be obtained.
【００１９】また、本実施形態では、ニッケル箔又はア
ルミニウム箔の正極集電体を用いたが、アルミニウム箔
は、ニッケル箔に比べ融点が低いために、小さい超音波
エネルギーでそれぞれ正、負極集電部材に超音波圧接す
ることができるので、超音波圧接時の正、負極集電タブ
の破断をより抑制することができる。In the present embodiment, the positive electrode current collector made of nickel foil or aluminum foil was used. However, since aluminum foil has a lower melting point than nickel foil, positive and negative electrode current collectors can be collected with small ultrasonic energy. Since it is possible to apply ultrasonic pressure to the member, it is possible to further suppress breakage of the positive and negative electrode current collector tabs during ultrasonic pressure contact.
【００２０】更に、本実施形態では、ニッケル箔、アル
ミニウム箔の正極集電体及び銅箔の負極集電体の厚さを
３０μｍ以下と薄くしたために、超音波圧接により、
正、負極集電タブの亀裂や破断がより生じやすくなる
が、正、負極集電部材の角部に正、負極集電部材面取り
部が形成されているので、正、負極集電タブの破断や亀
裂を防止することができる。Further, in this embodiment, since the thickness of the positive electrode current collector of nickel foil and aluminum foil and the thickness of the negative electrode current collector of copper foil are reduced to 30 μm or less, ultrasonic pressure welding is used.
Positive, negative electrode current collector tabs are more likely to crack or break, but positive, negative electrode current collector member chamfers are formed at the corners of the negative electrode current collector member, so positive and negative electrode current collector tabs break And cracks can be prevented.
【００２１】更にまた、本実施形態では、正、負極集電
部材と正、負極集電タブとの超音波圧接時に、正、負極
集電タブ積層部の最外側面を保護するために正、負極集
電タブ積層部の最外側面に沿って保護材を配置して超音
波圧接したので、超音波溶接端子と正、負極集電タブと
の溶接箇所の損傷を抑制することができる。Furthermore, in the present embodiment, when positive and negative electrode current collecting members and positive and negative electrode current collecting tabs are ultrasonically pressure-bonded, positive and positive in order to protect the outermost surface of the negative electrode current collecting tab laminated portion, Since the protective material is disposed along the outermost surface of the negative electrode current collector tab laminated portion and ultrasonic pressure welding is performed, it is possible to suppress damage to the welding portion between the ultrasonic welding terminal and the positive and negative electrode current collector tabs.
【００２２】なお、本実施形態では、正、負極集電部材
のそれぞれ正、負極集電タブが沿う角部を面取りして
正、負極集電部材面取り部を形成した例を示したが、こ
れに限定されるものではなく、例えば、面取りをする代
わりにＲ付けをするようにしてもよい。In this embodiment, the positive and negative electrode current collecting members are respectively chamfered at the corners along which the positive and negative electrode current collecting tabs are chamfered to form the positive and negative electrode current collecting member chamfers. The present invention is not limited to this, and for example, R may be attached instead of chamfering.
【００２３】また、本実施形態では、正、負極集電体接
合部の両側面に、正、負極集電部材が溶接した例を示し
たが、予め正、負極集電体接合部の下端角部に面取り又
はＲ付けしておき、その後、直接正、負極集電体接合部
の両側面に正、負極集電タブを超音波圧接するようにし
てもよい。In this embodiment, the positive and negative electrode current collector members are welded to both side surfaces of the positive and negative electrode current collector joints. The portions may be chamfered or rounded, and then the positive and negative electrode current collector tabs may be ultrasonically pressure-contacted to both side surfaces of the positive and negative electrode current collector joint portions.
【００２４】更に、本実施形態では、下部側にそれぞれ
断面略矩形状の正、負極集電体接合部を有する正、負極
外部端子を例示したが、正、負極外部端子の形状はこれ
に限定されるものではなく、例えば、正、負極集電体接
合部の形状を断面略Ｕ字状の形状にしてもよい。Further, in the present embodiment, the positive and negative electrode external terminals having the positive and negative electrode current collector joints each having a substantially rectangular cross section on the lower side are exemplified, but the shapes of the positive and negative electrode external terminals are not limited to this. However, for example, the positive and negative electrode current collector joints may have a substantially U-shaped cross section.
【００２５】また更に、本実施形態では、正、負極板を
それぞれ５０、５１枚使用して枚数がほぼ同数となるよ
うに２つに集合して積層し、正、負極集電部材にそれぞ
れ超音波圧接した例を示したが、それぞれ正、負極板の
枚数は限定されるものではない。Furthermore, in the present embodiment, 50 and 51 positive and negative electrode plates are used, respectively, and the positive and negative electrode current collecting members are stacked so that the number of the positive and negative electrode plates is approximately the same. An example in which sonic pressure welding is performed is shown, but the number of positive and negative electrode plates is not limited.
【００２６】（第２実施形態）次に、本発明を角型リチ
ウム二次電池に適用した第２の実施の形態について説明
する。本実施形態は、正、負極集電タブに沿う角部がＲ
付けされた保護材を用いたものである。なお、本実施形
態において、上述した第１実施形態と同一の構成要素に
は同一の符号を付してその説明を省略し、異なる箇所の
み説明する。(Second Embodiment) Next, a second embodiment in which the present invention is applied to a prismatic lithium secondary battery will be described. In this embodiment, the corners along the positive and negative electrode current collecting tabs are rounded.
It uses a protective material attached. In the present embodiment, the same components as those in the above-described first embodiment are designated by the same reference numerals, the description thereof will be omitted, and only different portions will be described.
【００２７】図２に示すように、本実施形態では、正極
集電タブを保護するために、正極集電タブ積層部の最外
側面に沿って、正極集電タブに沿う角部がＲ付けされた
保護材Ｒ付け部３ａを有する板状の保護材３を配置し
た。保護材３の材質にはニッケル又はアルミニウムが用
いられている。保護材３の更に外側に超音波溶接端子を
配置して、正極集電部材、正極集電タブ積層部及び保護
材３を超音波圧接して、角型リチウム二次電池３０を作
製した。As shown in FIG. 2, in this embodiment, in order to protect the positive electrode current collecting tab, a corner portion along the positive electrode current collecting tab is rounded along the outermost surface of the positive electrode current collecting tab laminated portion. The plate-shaped protective material 3 having the protective material R attaching portion 3a thus arranged was arranged. The protective material 3 is made of nickel or aluminum. An ultrasonic welding terminal was arranged further outside of the protective material 3, and the positive electrode current collector member, the positive electrode current collector tab laminated portion and the protective material 3 were ultrasonically pressure-welded to produce a square lithium secondary battery 30.
【００２８】従って、正極集電タブ積層部の最外側面
に、正極集電タブ積層部の最外側面が沿う角部がＲ付け
された保護材Ｒ付け部３ａを有する板状の保護材３が、
超音波圧接されて配設されている。Therefore, the plate-like protective material 3 having the protective material R attaching portion 3a in which the corner portion along which the outermost surface of the positive electrode current collector tab laminated portion is rounded is attached to the outermost surface of the positive electrode current collector tab laminated portion. But,
It is disposed so as to be ultrasonically pressed.
【００２９】本実施形態では、正、負極集電部材及び
正、負極集電タブの超音波圧接時に、正、負極集電タブ
を保護するように正、負極集電タブの最外側面に沿って
保護材３を配置して超音波圧接したので、超音波溶接端
子と正、負極集電タブとの溶接箇所の損傷を抑制できる
と共に、保護材３の角部が保護材Ｒ付け部３ａを有して
いるので、保護材Ｒ付け部３ａとの接触により正、負極
集電タブに亀裂又は破断が生ずることを防止することが
できる。従って、更に、生産性かつ集電性能に優れた電
池を得ることができる。In the present embodiment, the positive and negative electrode current collecting members and the positive and negative electrode current collecting tabs are welded along the outermost surface of the positive and negative electrode current collecting tabs so as to protect the positive and negative electrode current collecting tabs by ultrasonic pressure welding. Since the protective material 3 is arranged and ultrasonically pressure-welded, damage to the welded portion between the ultrasonic welding terminal and the positive and negative electrode current collecting tabs can be suppressed, and the corner portion of the protective material 3 forms the protective material R attaching portion 3a. Since it has, it is possible to prevent the positive and negative electrode current collecting tabs from cracking or breaking due to contact with the protective material R attaching portion 3a. Therefore, it is possible to further obtain a battery having excellent productivity and current collecting performance.
【００３０】なお、本実施形態では、保護材３が保護材
Ｒ付け部３ａを有する例を示したが、これに限定される
ものではなく、保護材３をＲ付けする代わりに面取りを
するようにしても同様の効果を得ることができる。In the present embodiment, the example in which the protective material 3 has the protective material R attaching portion 3a is shown, but the present invention is not limited to this, and the protective material 3 may be chamfered instead of being R-attached. However, the same effect can be obtained.
【００３１】[0031]
【実施例】次に、上述した実施形態に従って作製した実
施例の角型リチウム二次電池について説明する。比較の
ために作製した比較例の電池についても併記する。EXAMPLE Next, a prismatic lithium secondary battery of an example manufactured according to the above-described embodiment will be described. The batteries of Comparative Examples prepared for comparison are also shown.
【００３２】（実施例１）下表１に示すように、実施例
１では、正、負極集電体にそれぞれ厚さ３０μｍのニッ
ケル箔、銅箔を用い、正、負極集電部材にそれぞれ厚さ
約２ｍｍ、角部に０．５ｍｍの面取りをしたニッケル
板、銅板を用い、正、負極の保護材にそれぞれ厚さ約
０．１ｍｍのニッケル板、銅板（Ｒ付けなし）を用いて
電池を作製した。(Example 1) As shown in Table 1 below, in Example 1, positive and negative electrode current collectors were made of nickel foil and copper foil having a thickness of 30 μm, respectively, and positive and negative electrode current collector members were made thick respectively. A battery with a nickel plate and a copper plate each having a chamfer of about 2 mm and a corner of 0.5 mm is used, and a nickel plate and a copper plate (without R) having a thickness of about 0.1 mm are respectively used as the positive and negative electrode protective materials. It was made.
【００３３】[0033]
【表１】 [Table 1]
【００３４】（実施例２）表１に示すように、実施例２
では、正極集電体に厚さ３０μｍのアルミニウム箔を用
いた以外は実施例１と同様に電池を作製した。Example 2 As shown in Table 1, Example 2
Then, a battery was produced in the same manner as in Example 1 except that an aluminum foil having a thickness of 30 μm was used as the positive electrode current collector.
【００３５】（実施例３）表１に示すように、実施例３
では、正、負極集電体にそれぞれ厚さ２０μｍのアルミ
ニウム箔、銅箔を用いた以外は実施例１と同様に電池を
作製した。Example 3 As shown in Table 1, Example 3
Then, a battery was produced in the same manner as in Example 1 except that aluminum foil and copper foil each having a thickness of 20 μm were used as the positive and negative electrode current collectors.
【００３６】（実施例４）表１に示すように、実施例４
では、正極集電体に厚さ１５μｍのアルミニウム箔、負
極集電体に厚さ１０μｍの銅箔を用いた以外は実施例１
と同様に電池を作製した。Example 4 As shown in Table 1, Example 4
In Example 1, except that a 15 μm thick aluminum foil was used for the positive electrode current collector and a 10 μm thick copper foil was used for the negative electrode current collector.
A battery was prepared in the same manner as in.
【００３７】（実施例５）表１に示すように、実施例５
では、正極集電体に厚さ３０μｍのアルミニウム箔を用
い、正、負極集電部材にそれぞれ厚さ約２ｍｍ、角部に
０．５ｍｍのＲ付けをしたニッケル板、銅板を用いた以
外は実施例１と同様に電池を作製した。Example 5 As shown in Table 1, Example 5
Then, except that an aluminum foil having a thickness of 30 μm was used as the positive electrode current collector, and a nickel plate and a copper plate each having a thickness of about 2 mm and a corner of 0.5 mm having a radius R were used for the positive and negative electrode current collecting members. A battery was prepared in the same manner as in Example 1.
【００３８】（実施例６）表１に示すように、実施例６
では、正極集電体に厚さ３０μｍのアルミニウム箔を用
い、正、負極の保護材にそれぞれ下端部を曲げてＲ付け
をした厚さ０．１ｍｍのアルミニウム箔、銅箔を用いた
以外は実施例１と同様に電池を作製した。(Example 6) As shown in Table 1, Example 6 was used.
Then, except that an aluminum foil having a thickness of 30 μm was used as the positive electrode current collector, and a 0.1 mm thick aluminum foil and a copper foil each having a lower end portion bent and rounded as a protective material for the positive and negative electrodes were used. A battery was prepared in the same manner as in Example 1.
【００３９】（実施例７）表１に示すように、実施例７
では、正、負極集電体にそれぞれ厚さ２０μｍのアルミ
ニウム箔、銅箔を用い、正、負極の保護材に下端部を曲
げてＲ付けをした厚さ０．１ｍｍのアルミニウム箔、銅
箔を用いた以外は実施例１と同様に電池を作製した。(Example 7) As shown in Table 1, Example 7
Then, aluminum foil and copper foil with a thickness of 20 μm are used for the positive and negative electrode current collectors respectively, and an aluminum foil and a copper foil with a thickness of 0.1 mm are formed by bending the lower ends of the positive and negative electrode protective materials and attaching R. A battery was made in the same manner as in Example 1 except that it was used.
【００４０】（比較例１〜４）表１に示すように、比較
例１では、正極集電部材に厚さ約２ｍｍのニッケル板を
用い、比較例２〜比較例４では、正極集電部材にそれぞ
れ厚さ約２ｍｍのアルミニウム板を用いた以外はそれぞ
れ実施例１〜実施例４と同様に電池を作製した。(Comparative Examples 1 to 4) As shown in Table 1, in Comparative Example 1, a nickel plate having a thickness of about 2 mm was used for the positive electrode current collecting member, and in Comparative Examples 2 to 4, the positive electrode current collecting member was used. Batteries were produced in the same manner as in Examples 1 to 4 except that an aluminum plate having a thickness of about 2 mm was used for each.
【００４１】（試験・評価）次に、上述した実施例及び
比較例の電池を解体して、正、負極集電部材の角部に接
触する部分の正、負極集電タブと、保護材の角部に接触
する部分の正、負極集電タブと、について亀裂や破断の
状態を目視観察し、亀裂などの発生率を比較した。試験
の結果を下表２に示す。(Test / Evaluation) Next, the batteries of the above-mentioned Examples and Comparative Examples were disassembled, and the positive and negative electrode current collecting tabs of the portions contacting the corners of the positive and negative electrode current collecting members and the protective material were The positive and negative electrode current collecting tabs in contact with the corners were visually observed for cracks and fractures, and the rates of occurrence of cracks were compared. The test results are shown in Table 2 below.
【００４２】[0042]
【表２】 [Table 2]
【００４３】表２に示すように、実施例１〜実施例５及
び比較例１〜実施例４を比較することにより、実施例１
〜実施例５の電池では、正、負極板とも正、負極集電部
材の角部を面取り又はＲ付けすることによって、正、負
極集電タブに発生する亀裂や破断の発生率が１０〜５０
ポイント低下することが分かった。また、実施例１及び
２と比較例１及び２とを比較することにより、正、負極
集電体に用いる金属箔には、ニッケル箔より銅箔やアル
ミニウム箔を用いた方が亀裂や破断が発生しにくく、
正、負極集電部材の角部を面取り又はＲ付けすることの
効果も大きいことが分かった。また、実施例２〜実施例
４及び比較例２〜実施例４を比較することにより、アル
ミニウム箔、銅箔共に２０μｍ以下の厚さで、更に、
正、負極集電部材の角部を面取り又はＲ付けすることに
よる効果が大きいことも判明した。更に、実施例２、
３、６及び７より、実施例６及び実施例７の電池では、
保護材の角部を曲げてＲ付けすることによって、正、負
極集電タブに発生する亀裂や破断の発生率をより確実に
抑制できることが明らかとなった。これらの結果、実施
例の二次電池により、正、負極集電タブの亀裂又は破断
を防止することで生産性を向上し、かつ集電性能に優れ
た電池を提供することができることが分かった。As shown in Table 2, by comparing Example 1 to Example 5 and Comparative Example 1 to Example 4, Example 1
-In the battery of Example 5, both positive and negative electrode plates are positive, and by chamfering or rounding the corners of the negative electrode current collecting member, the incidence rate of cracks and fractures occurring in the positive and negative electrode current collecting tabs is 10 to 50.
It turns out that the points will drop. Moreover, by comparing Examples 1 and 2 with Comparative Examples 1 and 2, cracks and fractures were more likely to occur in the metal foils used for the positive and negative electrode current collectors than copper foils or aluminum foils rather than nickel foils. Less likely to occur,
It was found that the effect of chamfering or rounding the corners of the positive and negative electrode current collecting members was also great. Moreover, by comparing Examples 2 to 4 and Comparative Examples 2 to 4, both the aluminum foil and the copper foil have a thickness of 20 μm or less,
It was also found that the effect of chamfering or rounding the corners of the positive and negative electrode current collecting members was great. Furthermore, Example 2,
From 3, 6, and 7, the batteries of Example 6 and Example 7
It has been revealed that by bending and rounding the corners of the protective material, it is possible to more reliably suppress the occurrence rate of cracks and fractures that occur in the positive and negative electrode current collector tabs. As a result, it was found that the secondary battery of the example can improve productivity by preventing cracking or breakage of the positive and negative electrode current collecting tabs, and can provide a battery having excellent current collecting performance. .
【００４４】[0044]
【発明の効果】以上説明したように、本発明によれば、
集電部材の集電体が沿う角部が面取り又はＲ付けされて
いるので、集電部材の集電体が沿う角部との接触による
集電体の損傷の発生を抑制でき、集電体に亀裂又は破断
が生ずることを防止することができる、という効果を得
ることができる。As described above, according to the present invention,
Since the corners of the current collecting member along which the current collectors are chamfered or rounded, it is possible to prevent damage to the current collectors due to contact with the corners along which the current collectors of the current collectors follow. It is possible to obtain an effect that it is possible to prevent cracks or fractures from occurring in the.
【図１】本発明が適用可能な第１の実施の形態の角型リ
チウム二次電池の側断面図である。FIG. 1 is a side sectional view of a prismatic lithium secondary battery according to a first embodiment of the present invention.
【図２】本発明が適用可能な第２の実施の形態の角型リ
チウム二次電池の側断面図である。FIG. 2 is a side sectional view of a prismatic lithium secondary battery according to a second embodiment of the present invention.
２ 正極集電タブ（集電体の一部） ３ 保護材 ３ａ 保護材Ｒ付け部 ４ 正極集電部材（集電部材の一部） ４ａ 正極集電部材面取り部 ５ 正極外部端子（集電部材の一部） ５ａ 正極集電体接合部 ２０、３０ 角型リチウム二次電池（二次電池） 2 Positive electrode current collector tab (part of current collector) 3 protective materials 3a Protective material R attachment part 4 Positive electrode current collector (a part of current collector) 4a Positive electrode current collecting member chamfer 5 Positive electrode external terminal (part of current collector) 5a Positive electrode current collector junction 20, 30 Square lithium secondary battery (secondary battery)
Claims (4)
に沿って配置・溶接された二次電池であって、前記集電
部材の前記集電体が沿う角部は、面取り又はＲ付けされ
ていることを特徴とする二次電池。1. A secondary battery in which a current collector made of a metal foil is arranged and welded along a side surface of a current collecting member, and a corner portion along which the current collector of the current collecting member is chamfered or A secondary battery characterized by being marked with R.
あることを特徴とする請求項１に記載の二次電池。2. The secondary battery according to claim 1, wherein the current collector is an aluminum foil or a copper foil.
ことを特徴とする請求項１又は請求項２に記載の二次電
池。3. The secondary battery according to claim 1, wherein the current collector has a thickness of 20 μm or less.
波圧接時に前記集電体を保護するように該集電体の最外
側面に沿って配置される保護材を更に備え、前記保護材
の前記集電体が沿う角部が面取り又はＲ付けされている
ことを特徴とする請求項１乃至請求項３のいずれか１項
に記載の二次電池。4. The welding is ultrasonic pressure welding, and further comprising a protective material arranged along an outermost surface of the current collector so as to protect the current collector during the ultrasonic pressure welding, The secondary battery according to any one of claims 1 to 3, wherein a corner of the material along which the current collector is provided is chamfered or rounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002084941A JP2003282044A (en) | 2002-03-26 | 2002-03-26 | Secondary battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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|---|---|---|---|---|
| KR100740568B1 (en) | 2006-02-22 | 2007-07-18 | 주식회사 나래나노텍 | Improved method for manufacturing multi-layered electrode module and unit cell and multi-layered electrode module and unit cell manufactured by using the same |
| JP2008034356A (en) * | 2006-07-06 | 2008-02-14 | Enax Inc | Sheet-shaped secondary battery and its manufacturing method |
| US8119277B2 (en) | 2007-09-28 | 2012-02-21 | Sanyo Electric Co., Ltd. | Stack type battery |
| JP2012209269A (en) * | 2006-07-06 | 2012-10-25 | Enax Inc | Method for manufacturing sheet-like secondary battery |
| WO2013032194A3 (en) * | 2011-08-31 | 2013-04-25 | 주식회사 엘지화학 | Interconnector assembly and method for forming interconnector assembly in battery module |
| JP2013161686A (en) * | 2012-02-06 | 2013-08-19 | Toyota Industries Corp | Electricity storage device and vehicle |
| WO2013159454A1 (en) * | 2012-04-24 | 2013-10-31 | 实联长宜中国控股有限公司 | High-capacity cylindrical lithium ion battery and production method thereof |
| US8846240B2 (en) | 2012-02-16 | 2014-09-30 | Lg Chem, Ltd. | Battery cell interconnect and voltage sensing assembly and method of manufacturing the assembly |
| US8974938B2 (en) | 2011-08-30 | 2015-03-10 | Lg Chem, Ltd. | Battery system and method for coupling a battery cell assembly to an electrically non-conductive base member |
| US9178192B2 (en) | 2011-05-13 | 2015-11-03 | Lg Chem, Ltd. | Battery module and method for manufacturing the battery module |
| US9496544B2 (en) | 2011-07-28 | 2016-11-15 | Lg Chem. Ltd. | Battery modules having interconnect members with vibration dampening portions |
| US9620761B2 (en) | 2014-09-09 | 2017-04-11 | Lg Chem, Ltd. | Battery cell interconnect and voltage sensing assembly and a battery module |
| US9905892B2 (en) | 2015-02-09 | 2018-02-27 | Lg Chem, Ltd. | Battery module and method of coupling first and second electrical terminals of first and second battery cells to first and second voltage sense members of an interconnect assembly |
| US10020483B2 (en) | 2015-02-09 | 2018-07-10 | Lg Chem, Ltd. | Battery module and method of coupling first and second electrical terminals of first and second battery cells to a voltage sense member of an interconnect assembly |
| JP2018137166A (en) * | 2017-02-23 | 2018-08-30 | トヨタ自動車株式会社 | Lithium ion secondary battery |
| US10734655B2 (en) | 2012-05-10 | 2020-08-04 | Gs Yuasa International Ltd. | Electric storage device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR100740568B1 (en) | 2006-02-22 | 2007-07-18 | 주식회사 나래나노텍 | Improved method for manufacturing multi-layered electrode module and unit cell and multi-layered electrode module and unit cell manufactured by using the same |
| JP2008034356A (en) * | 2006-07-06 | 2008-02-14 | Enax Inc | Sheet-shaped secondary battery and its manufacturing method |
| JP2012209269A (en) * | 2006-07-06 | 2012-10-25 | Enax Inc | Method for manufacturing sheet-like secondary battery |
| US8119277B2 (en) | 2007-09-28 | 2012-02-21 | Sanyo Electric Co., Ltd. | Stack type battery |
| US9178192B2 (en) | 2011-05-13 | 2015-11-03 | Lg Chem, Ltd. | Battery module and method for manufacturing the battery module |
| US9496544B2 (en) | 2011-07-28 | 2016-11-15 | Lg Chem. Ltd. | Battery modules having interconnect members with vibration dampening portions |
| US8974938B2 (en) | 2011-08-30 | 2015-03-10 | Lg Chem, Ltd. | Battery system and method for coupling a battery cell assembly to an electrically non-conductive base member |
| WO2013032194A3 (en) * | 2011-08-31 | 2013-04-25 | 주식회사 엘지화학 | Interconnector assembly and method for forming interconnector assembly in battery module |
| CN103733386A (en) * | 2011-08-31 | 2014-04-16 | 株式会社Lg化学 | Interconnector assembly and method for forming interconnector assembly in battery module |
| US8871376B2 (en) | 2011-08-31 | 2014-10-28 | Lg Chem, Ltd. | Interconnection assemblies and methods for forming the interconnection assemblies in a battery module |
| JP2013161686A (en) * | 2012-02-06 | 2013-08-19 | Toyota Industries Corp | Electricity storage device and vehicle |
| US8846240B2 (en) | 2012-02-16 | 2014-09-30 | Lg Chem, Ltd. | Battery cell interconnect and voltage sensing assembly and method of manufacturing the assembly |
| KR101571950B1 (en) * | 2012-04-24 | 2015-12-04 | 시리엔 아펙스 차이나 홀딩 컴퍼니 리미티드 | High-capacity cylindrical lithium ion battery and production method thereof |
| WO2013159454A1 (en) * | 2012-04-24 | 2013-10-31 | 实联长宜中国控股有限公司 | High-capacity cylindrical lithium ion battery and production method thereof |
| US10734655B2 (en) | 2012-05-10 | 2020-08-04 | Gs Yuasa International Ltd. | Electric storage device |
| US9620761B2 (en) | 2014-09-09 | 2017-04-11 | Lg Chem, Ltd. | Battery cell interconnect and voltage sensing assembly and a battery module |
| US9905892B2 (en) | 2015-02-09 | 2018-02-27 | Lg Chem, Ltd. | Battery module and method of coupling first and second electrical terminals of first and second battery cells to first and second voltage sense members of an interconnect assembly |
| US10020483B2 (en) | 2015-02-09 | 2018-07-10 | Lg Chem, Ltd. | Battery module and method of coupling first and second electrical terminals of first and second battery cells to a voltage sense member of an interconnect assembly |
| JP2018137166A (en) * | 2017-02-23 | 2018-08-30 | トヨタ自動車株式会社 | Lithium ion secondary battery |
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