JP2003045474A - Sealed battery - Google Patents
Sealed batteryInfo
- Publication number
- JP2003045474A JP2003045474A JP2001235916A JP2001235916A JP2003045474A JP 2003045474 A JP2003045474 A JP 2003045474A JP 2001235916 A JP2001235916 A JP 2001235916A JP 2001235916 A JP2001235916 A JP 2001235916A JP 2003045474 A JP2003045474 A JP 2003045474A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- positive electrode
- active material
- thickness
- material layer
- 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
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、密閉型電池に関
し、特に集電体上に活物質層を形成した正極電極および
負極電極をセパレータを介して対向させるとともに、少
なくともいずれか一方を巻回、あるいは折り曲げて構成
した密閉型電池に関する。
【０００２】
【従来の技術】小型の電子機器の電源として各種の電池
が用いられている。携帯電話、ノートパソコン、カムコ
ーダ等の電源としては、小型で大容量の密閉型電池であ
るリチウムイオン二次電池等の非水電解液電池が用いら
れている。これらの非水電解液電池としては、円筒型、
角型の構造を有したものが用いられている。小型の電子
機器の電源として用いられているリチウムイオン電池に
おいては、正極集電体および負極集電体にそれぞれ活物
質を塗布した後に、セパレータを介在させて巻回して電
池缶内に収納して密閉したものが用いられている。
【０００３】電池使用機器は一般には直方体状の形状の
電池収納部を有しており、このような電池収納部に収納
する電池としては、円筒形状の電池では無効な容積が大
きくなるという問題があった。さらに、電池収納部分の
厚さによって円筒型の電池の径が制限を受けるので、小
型、あるいは薄型の機器においては、厚みの薄い角柱状
の角型電池が用いられている。これらの電池は、一般に
は、正極電極と負極電極とをセパレータを介して糸巻き
状に巻回した後に、扁平状に成形して金属製の角型の容
器に収納したり可撓性の部材によって被覆している。ま
た、電気自動車用等の大容量の電池においても円筒形の
電池と共に、糸巻き状の巻回体を扁平に成形した電池と
共に、少なくとも一方の電極を折り曲げて対極と積層し
たり、少なくとも一方の電極を九十九折り状に折り曲げ
てセパレータを介して対極を配置することが行われてい
る。
【０００４】図６は、従来の巻回型の角型電池を説明す
る図であり、電池要素の中心部を説明する図である。電
池要素１は、正極電極２と負極電極３がセパレータ４を
介して配置されて巻回されている。具体的には、正極電
極２の両面にセパレータ４を配置して負極電極３とを対
向させて巻回をした後に扁平状に成形を行っている。巻
回した電池要素１の正極電極２の中心部曲面５は、径が
小さな曲面を描くために、正極集電体６の内側部７と外
側部８との間には歪みが生じ、中心部曲面５で正極電極
２の活物質層と集電体との付着特性に問題が生じ、甚だ
しい場合には、正極活物質層が剥がれ落ちたり、あるい
は正極活物質層がひび割れや切断、正極電極が集電体を
含めて切断するという問題点があった。
【０００５】そこで、こうした問題点を解決した電池が
特開平５−２８３１０７号公報、特開平６−１８７９９
８号公報に提案されている。これらは、図７に、従来例
として示すように、電池要素１を構成する正極電極２、
および負極電極３には、活物質層が間欠的に塗布されて
おり、中心部曲面５の正極集電体９、および中心部曲面
１０の負極電極３の負極集電体１１には、正極活物質層
および負極活物質層が形成されていないものである。こ
のような手段によって、正極電極あるいは負極電極の曲
面部、折り曲げ部における電極活物質の剥がれや切断と
いう問題点を解決することが可能であるものの、曲面あ
るいは折り曲げ部には活物質層が形成されていないの
で、電池としての容量が小さなものとなる。しかも、リ
チウムイオン電池のような電池においては、正極活物質
層と負極活物質層が形成されていない部分の位置関係に
よっては、負極電極側に電流が集中する個所が生じ、充
電時に金属リチウムが析出する等の危険性もあった。
【０００６】
【発明が解決しようとする課題】本発明は、正極電極と
負極電極をセパレータを介して対向させて巻回、折り曲
げて配置した電池において、巻回部、あるいは折り曲げ
部において、正極電極、負極電極のひび割れ、切断、あ
るいは集電体表面からの電池活物質の剥離、切断等の問
題が生じることがない特性の優れた密閉型電池を提供す
ることを課題とするものである。
【０００７】
【課題を解決するための手段】本発明の課題は、正極電
極と負極電極をセパレータを介して対向させて巻回ある
いは折り曲げた角型電池において、正極電極、負極電極
の少なくともいずれか一方は、導電性基体上に形成され
た塗布層を有し、曲面部あるいは折り曲げ部の少なくと
も一部の内側の塗布層の厚みが曲面部あるいは折り曲げ
部以外の部分のの塗布層の厚みよりも厚みが小さい密閉
型電池によって解決することができる。また、正極電極
と負極電極をセパレータを介して対向させて巻回あるい
は折り曲げた角型電池において、正極電極、負極電極の
少なくともいずれか一方は、導電性基体上に形成された
塗布層を有し、曲面部あるいは折り曲げ部の少なくとも
一部の塗布層は、内側の厚み外側の厚みよりも小さい密
閉型電池によって解決することができる。また、正極電
極と負極電極をセパレータを介して対向させたものを扁
平な糸巻き状に巻回した電池要素を有する密閉型電池で
ある。少なくとも一方の電極が少なくとも一回折り曲げ
られたものである前記の密閉型電池である。正極電極ま
たは負極電極の少なくともいずれか一方は、集電体上に
形成した電極活物質層が、吐出開口部の大きさが調整可
能な塗布装置によって厚みを変化させて形成したもので
ある前記の密閉型電池である。正極電極または負極電極
の少なくともいずれか一方は、集電体上に形成した厚み
変化した塗布層を有する電極を、可撓性部材からなる表
面層を有する圧縮ロールによって圧縮したものである前
記の密閉型電池である。また、リチウムイオン電池であ
る前記の密閉型電池である。
【０００８】
【発明の実施の形態】本発明の密閉型電池は、電極に形
成される曲面部、折り曲げ部の少なくとも一部を、曲面
部または折り曲げ部の内側に位置する活物質層の厚さ
を、曲面部または折り曲げ部以外の部分の厚みに比べて
厚みを小さくすることによって、曲面部あるいは折り曲
げ部を形成した場合においても、曲面部または折り曲げ
部の活物質層が切断したり、電池電極が切れることがな
く、また曲面部に活物質を塗布しない電池のように充放
電容量が低下することがない密閉型電池を提供したもの
である。
【０００９】以下に図面を参照して本発明を説明する。
図１は、本発明の一実施例を説明する図であり、電池要
素の中心部を説明する図である。電池要素１は、正極電
極２と負極電極３がセパレータ４を介して配置されて巻
回されている。正極電極２の両面にセパレータ４を配置
して負極電極３とを対向させて糸巻き状に巻回をした後
に扁平状に押圧して成形を行ったものである。巻回した
電池要素１の中心部に位置し、正極電極２の中心部曲面
５の径が小さな弧を描く部分は、内側活物質層１２の厚
みがその他の部分の厚みに比べて小さく、また、外側活
物質層１３の厚みに比べて厚みが小さく形成したもので
ある。このため、糸巻き状に巻回の後に押圧して扁平に
成形した場合であっても活物質層の変形等を防止するこ
とが可能となる。
【００１０】図２は、本発明の他の実施例を説明する図
であり、電池要素の中心部を説明する図である。電池要
素１は、正極電極２と負極電極３がセパレータ４を介し
て配置されて巻回されている。正極電極２の両面にセパ
レータ４を配置して負極電極３とを対向させて糸巻き状
に巻回をした後に扁平状に押圧して成形を行ったもので
ある。巻回した電池要素１の中心部に位置し、正極電極
２の中心部曲面５の径が小さな円弧を描く部分は、内側
活物質層１２の厚みが、その他の部分の厚みに比べて小
さく、更に外側活物質層１３の厚みに比べて厚みが小さ
く形成されている。更に負極電極３の中心部曲面１４
は、内側活物質層１５が外側活物質層１６に比べて厚み
が小さく形成されている。このため、糸巻き状に巻回の
後に押圧して扁平に成形した場合であっても、中心部の
正極電極および負極電極の曲面部での活物質層の変形、
正極電極および負極電極の切断等を防止することが可能
となる。
【００１１】本発明の密閉型電池は、曲面部に形成する
活物質層の内側の厚みを、その他の部分の厚みに比べて
小さくし、また外側の厚みよりも小さく形成したもので
あるが、電極の巻回体のすべての曲面部に対して適用し
ても良いが、中心部の曲率半径が小さく、巻回の際の影
響を大きく受ける部分のみに適用したものであっても良
い。また、曲面部の内側の厚みが薄い部分の厚みは、形
成される曲面部の曲率、形成される活物質層の厚み等に
よって異なるが、例えば、集電体上に１５０μｍの厚み
で活物質層を形成する場合には、厚みの小さな部分は１
００μｍ程度とすることができる。
【００１２】図３は、本発明の他の実施例を説明する図
である。電池要素１は、九十九折り状に折り曲げた負極
電極３の両面に九十九折り状に折り曲げてセパレータ４
を配置し、セパレータ４を介して負極電極３に対向して
正極電極２を配置し、正極電極、セパレータ、負極電極
を密着して電池要素を作製するものである。そして、負
極電極３の折り曲げ部の内側活物質層１５が他の部分の
活物質層に比べて厚みが薄くされている。その結果、九
十九折り状に折り曲げられた部分の負極電極が切れた
り、あるいは活物質層が剥がれるという問題点は生じな
くなる。また、図３においては、正極電極２について
は、個別の電極を配置する例を示したが、正極電極も九
十九折り状であっても良く、その場合には正極電極の折
り曲げ部の内側活物質層の厚みが他の部分に比べて厚み
が薄くされる。
【００１３】図４は、本発明の密閉型電池に用いる電極
を説明する図である。図４（Ａ）は、本発明の密閉型電
池に用いる正極電極の断面図であり、図４（Ｂ）は、従
来の電極を説明する断面図である。図４（Ｃ）は、製造
工程の一例を説明する図である。従来の電極が図４
（Ｂ）に示すように、正極活物質層２１が正極集電体９
の表面に一様な厚さで形成されているのに対して、本発
明の正極電極は、図４（Ａ）に示すように、本発明の正
極電極２には、正極集電体９の両面に形成した正極活物
質層２１に厚みの薄い部分２２が設けられている。厚み
の薄い部分と通常の厚みの部分との間には、徐々に厚み
が変化するような傾斜部２３を設け、急峻な段差が形成
されないようにすることが好ましい。このような、厚み
が変化した正極電極は、図４（Ｃ）に一例を示す塗布装
置３０によって形成することができる。塗布装置３０に
おいて回転するバックアップロール３１上を走行する集
電体９は、正極用の活物質層形成組成物３２をドクター
３３とシャッター３４によって形成される塗布ヘッドに
よって塗布される。ドクター３３をカム３５の動作によ
って上下に位置を変化させることによって形成される正
極活物質層２１に厚みの薄い部分２２が形成される。電
池電極は、集電体上に活物質層を形成し乾燥を行った後
に、活物質層を圧縮して、活物質層の充填密度を高める
と共に集電体との導電接触特性を高めることが行われ
る。一般には、活物質層の厚みに比べて充分に径が大き
な金属製のロールによって圧縮が行われている。
【００１４】図５は、圧縮装置による圧縮方法を説明す
る図であり、図５（Ａ）は従来の圧縮装置による方法を
示し、図５（Ｂ）は本発明の圧縮装置による方法を示
す。図５（Ａ）に示すように、従来の圧縮装置では、圧
縮装置４０のロール４１によって正極電極２を圧縮する
と、正極活物質層２１の厚みの薄い部分２２には、圧縮
装置のロール４１は接触しないので、正極電極２に形成
された厚みの薄い部分２２には、ロール４１によって圧
縮は行われず、しかも厚みの薄い部分と通常の厚みの部
分との間が圧縮によって変形も生じる。ところが、図５
（Ｂ）に示すように本発明の圧縮装置４０では、金属製
のロール４１の表面には、ゴムなど可撓性部材層４２が
設けられている。このため、厚みの薄い部分２１の形成
によって、正極電極２の表面に凹部が生じた部分にも均
等に圧縮力が印加される。また、ロール表面に形成する
可撓性部材層４２は、電極の厚みの薄い部分の形状に合
致する形状としたものであっても良い。このようにする
ことによってより確実な圧縮が可能となる。例えば、集
電体上に１４０μｍの厚みで活物質層を形成し、厚みの
小さな部分は６０μｍとした場合には、圧縮によってそ
れぞれ８０μｍ、４０μｍの厚さとすることができる。
また、内側の厚みが小さな部分に対向する曲面部の外側
の厚みは、曲面部以外の部分と同一の厚みでも良いが、
曲面部の厚みをその他の部分に比べて厚みを小さくして
も良い。
【００１５】
【発明の効果】本発明の密閉型電池は、電池要素の巻回
体の少なくとも中心部に形成される曲面部おいて、内側
に形成する活物質層の厚みを曲面部以外の部分の活物質
層の厚みに比べて小さくしたので、電池要素の巻回体の
中心部の曲率半径の小さな部分においても、電池電極が
切断したりあるいは活物質層の亀裂や剥がれ等が生じる
ことがなく、電気的特性に優れ、信頼性の高い密閉型電
池を提供することができる。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a sealed battery, and in particular, a positive electrode and a negative electrode each having an active material layer formed on a current collector are opposed to each other via a separator. Also, the present invention relates to a sealed battery formed by winding or bending at least one of them. 2. Description of the Related Art Various batteries are used as power supplies for small electronic devices. Non-aqueous electrolyte batteries such as lithium ion secondary batteries, which are small, large-capacity sealed batteries, are used as power sources for mobile phones, notebook computers, camcorders, and the like. These nonaqueous electrolyte batteries include a cylindrical type,
Those having a square structure are used. In a lithium ion battery used as a power source for a small electronic device, an active material is applied to each of a positive electrode current collector and a negative electrode current collector, and then wound with a separator interposed therebetween and stored in a battery can. Sealed ones are used. Battery-equipped equipment generally has a rectangular parallelepiped battery housing. The battery housed in such a battery housing has the problem that a cylindrical battery has an ineffective volume. there were. Furthermore, since the diameter of a cylindrical battery is limited by the thickness of the battery housing portion, a prismatic battery having a small thickness is used in a small or thin device. In general, these batteries are formed by winding a positive electrode and a negative electrode in a thread-wound form via a separator, then forming the flat electrode into a flat shape and storing it in a metal square container or by using a flexible member. Coated. In addition, in a large-capacity battery for an electric vehicle or the like, at least one electrode is folded and laminated with a counter electrode together with a cylindrical battery, and a battery in which a wound wound body is formed into a flat shape, or at least one electrode. Is folded in a 99-fold form, and a counter electrode is arranged via a separator. FIG. 6 is a view for explaining a conventional wound rectangular battery, and is a view for explaining a central portion of a battery element. The battery element 1 is wound with a positive electrode 2 and a negative electrode 3 arranged with a separator 4 interposed therebetween. Specifically, the separator 4 is disposed on both surfaces of the positive electrode 2, the negative electrode 3 is opposed to the separator 4, and the resultant is wound into a flat shape. Since the curved surface 5 at the center of the positive electrode 2 of the wound battery element 1 has a small diameter, a distortion occurs between the inner portion 7 and the outer portion 8 of the positive electrode current collector 6, and The curved surface 5 causes a problem in the adhesion characteristics between the active material layer of the positive electrode 2 and the current collector, and in severe cases, the positive electrode active material layer is peeled off, or the positive electrode active material layer is cracked or cut. There was a problem of cutting including the current collector. [0005] To solve such problems, Japanese Patent Application Laid-Open Nos. Hei 5-283107 and Hei 6-18799 disclose a battery.
No. 8 has been proposed. These are, as shown in FIG. 7 as a conventional example, a positive electrode 2 constituting a battery element 1,
An active material layer is intermittently applied to the negative electrode 3 and the positive electrode current collector 9 of the central curved surface 5 and the negative electrode current collector 11 of the negative electrode 3 of the central curved surface 10. The material layer and the negative electrode active material layer are not formed. By such means, it is possible to solve the problem of peeling or cutting of the electrode active material at the curved surface portion or the bent portion of the positive electrode or the negative electrode, but the active material layer is formed on the curved surface or the bent portion. The battery capacity is small. Moreover, in a battery such as a lithium ion battery, depending on the positional relationship between the portion where the positive electrode active material layer and the negative electrode active material layer are not formed, a portion where current concentrates on the negative electrode side occurs, and metallic lithium is generated during charging. There was also a risk of precipitation. SUMMARY OF THE INVENTION The present invention relates to a battery in which a positive electrode and a negative electrode are wound and bent with the separator facing each other with a separator interposed therebetween. It is an object of the present invention to provide a sealed battery excellent in characteristics that does not cause problems such as cracking and cutting of a negative electrode, and peeling and cutting of a battery active material from a current collector surface. SUMMARY OF THE INVENTION An object of the present invention is to provide a prismatic battery in which a positive electrode and a negative electrode are wound or bent so as to face each other with a separator interposed therebetween, and at least one of the positive electrode and the negative electrode is provided. One has a coating layer formed on the conductive substrate, and the thickness of the coating layer inside at least a part of the curved surface portion or the bent portion is larger than the thickness of the coating layer in the portion other than the curved surface portion or the bent portion. The problem can be solved by a sealed battery having a small thickness. Further, in a prismatic battery in which a positive electrode and a negative electrode are wound or bent so as to face each other with a separator interposed therebetween, at least one of the positive electrode and the negative electrode has a coating layer formed on a conductive substrate. The coating layer of at least a part of the curved surface portion or the bent portion can be solved by a sealed battery having a smaller inner thickness than an outer thickness. In addition, the sealed battery has a battery element in which a positive electrode and a negative electrode are opposed to each other with a separator interposed therebetween, and wound in a flat thread form. The sealed battery according to the above, wherein at least one electrode is bent at least once. At least one of the positive electrode and the negative electrode is formed by changing the thickness of the electrode active material layer formed on the current collector by a coating apparatus in which the size of the discharge opening is adjustable. It is a sealed battery. At least one of the positive electrode and the negative electrode is obtained by compressing an electrode having a coating layer with a changed thickness formed on a current collector by a compression roll having a surface layer made of a flexible member. Type battery. Further, the above sealed battery is a lithium ion battery. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a sealed battery according to the present invention, at least a part of a curved surface portion and a bent portion formed on an electrode has a thickness of an active material layer located inside the curved surface portion or the bent portion. By reducing the thickness compared to the thickness of the portion other than the curved portion or the bent portion, even when the curved portion or the bent portion is formed, the active material layer of the curved portion or the bent portion may be cut, or the battery electrode may be cut. The present invention provides a sealed battery in which the battery does not break and the charge / discharge capacity does not decrease unlike a battery in which an active material is not applied to a curved surface portion. The present invention will be described below with reference to the drawings.
FIG. 1 is a view for explaining one embodiment of the present invention, and is a view for explaining a central portion of a battery element. The battery element 1 is wound with a positive electrode 2 and a negative electrode 3 arranged with a separator 4 interposed therebetween. The separator 4 is disposed on both surfaces of the positive electrode 2, the negative electrode 3 is opposed to the negative electrode 3, the wire is wound in a pin winding shape, and then pressed flat to form. A portion located in the center of the wound battery element 1 and drawing an arc where the diameter of the center curved surface 5 of the positive electrode 2 is small is smaller in thickness of the inner active material layer 12 than the thickness of the other portions. , Formed to have a thickness smaller than the thickness of the outer active material layer 13. For this reason, even if it is pressed and then flattened into a wound shape, deformation of the active material layer can be prevented. FIG. 2 is a view for explaining another embodiment of the present invention, and is a view for explaining a central portion of a battery element. The battery element 1 is wound with a positive electrode 2 and a negative electrode 3 arranged with a separator 4 interposed therebetween. The separator 4 is disposed on both surfaces of the positive electrode 2, the negative electrode 3 is opposed to the negative electrode 3, the wire is wound in a pin winding shape, and then pressed flat to form. In the central portion of the wound battery element 1, the portion where the diameter of the central curved surface 5 of the positive electrode 2 draws a small arc, the thickness of the inner active material layer 12 is smaller than the thickness of the other portions, Further, the thickness is formed smaller than the thickness of the outer active material layer 13. Further, the central curved surface 14 of the negative electrode 3
The thickness of the inner active material layer 15 is smaller than that of the outer active material layer 16. For this reason, even if it is pressed and wound flat after being wound into a wound shape, deformation of the active material layer at the curved portions of the central positive electrode and the negative electrode,
It is possible to prevent disconnection of the positive electrode and the negative electrode. In the sealed battery according to the present invention, the thickness of the inside of the active material layer formed on the curved surface portion is made smaller than the thickness of other portions and smaller than the outside thickness. The present invention may be applied to all the curved surface portions of the wound body of the electrode, or may be applied only to a portion having a small radius of curvature at the center portion and greatly affected by winding. The thickness of the thin portion inside the curved surface portion varies depending on the curvature of the curved surface portion to be formed, the thickness of the active material layer to be formed, and the like. For example, the active material layer has a thickness of 150 μm on the current collector. Is formed, the portion having a small thickness is 1
It can be about 00 μm. FIG. 3 is a diagram for explaining another embodiment of the present invention. The battery element 1 is folded in 99-fold form on both sides of the negative electrode 3 folded in 99-fold form, and the separator 4
Is disposed, the positive electrode 2 is disposed so as to face the negative electrode 3 with the separator 4 interposed therebetween, and the positive electrode, the separator, and the negative electrode are adhered to each other to produce a battery element. The thickness of the inner active material layer 15 in the bent portion of the negative electrode 3 is smaller than that of the other active material layers. As a result, the problem that the negative electrode in the portion folded in a 99-fold form is cut or the active material layer is peeled off does not occur. FIG. 3 shows an example in which individual electrodes are arranged for the positive electrode 2. However, the positive electrode may have a ninety-nine fold shape. The thickness of the active material layer is reduced as compared with other portions. FIG. 4 is a diagram illustrating electrodes used in the sealed battery of the present invention. FIG. 4A is a cross-sectional view of a positive electrode used in the sealed battery of the present invention, and FIG. 4B is a cross-sectional view illustrating a conventional electrode. FIG. 4C is a diagram illustrating an example of a manufacturing process. Figure 4 shows a conventional electrode
As shown in (B), the positive electrode active material layer 21 is
4A, the positive electrode of the present invention has a positive electrode current collector 9 on the positive electrode 2 of the present invention, as shown in FIG. A thin portion 22 is provided on a positive electrode active material layer 21 formed on both surfaces. It is preferable that an inclined portion 23 having a gradually changing thickness is provided between a portion having a small thickness and a portion having a normal thickness so that a steep step is not formed. Such a positive electrode having a changed thickness can be formed by a coating apparatus 30 shown in FIG. 4C as an example. The current collector 9 running on the backup roll 31 rotating in the coating device 30 is coated with the active material layer forming composition 32 for the positive electrode by a coating head formed by a doctor 33 and a shutter 34. The thin portion 22 is formed in the positive electrode active material layer 21 formed by changing the position of the doctor 33 up and down by the operation of the cam 35. After forming an active material layer on a current collector and drying the battery electrode, the active material layer is compressed to increase the packing density of the active material layer and to improve the conductive contact characteristics with the current collector. Done. Generally, compression is performed by a metal roll having a diameter sufficiently larger than the thickness of the active material layer. FIG. 5 is a diagram for explaining a compression method by a compression device. FIG. 5A shows a method by a conventional compression device, and FIG. 5B shows a method by a compression device of the present invention. As shown in FIG. 5A, in the conventional compression device, when the positive electrode 2 is compressed by the roll 41 of the compression device 40, the roll 41 of the compression device is attached to the thin portion 22 of the positive electrode active material layer 21. Since there is no contact, the thin portion 22 formed on the positive electrode 2 is not compressed by the roll 41, and the deformation between the thin portion and the normal thickness portion is also caused by the compression. However, FIG.
As shown in (B), in the compression device 40 of the present invention, a flexible member layer 42 such as rubber is provided on the surface of a metal roll 41. For this reason, by forming the thin portion 21, the compressive force is evenly applied to the portion where the concave portion is formed on the surface of the positive electrode 2. Further, the flexible member layer 42 formed on the roll surface may have a shape that matches the shape of the thin portion of the electrode. This enables more reliable compression. For example, in the case where an active material layer is formed with a thickness of 140 μm on a current collector and a portion having a small thickness is set to 60 μm, the thickness can be reduced to 80 μm and 40 μm by compression, respectively.
In addition, the thickness of the outside of the curved surface portion facing the portion where the inside thickness is small may be the same thickness as the portion other than the curved surface portion,
The thickness of the curved surface portion may be smaller than that of the other portions. According to the sealed battery of the present invention, the thickness of the active material layer formed on the inner side of the curved portion formed at least at the center of the wound body of the battery element is other than the curved portion. Since the thickness of the active material layer is smaller than the thickness of the active material layer, the battery electrode may be cut or the active material layer may be cracked or peeled off even at a small radius of curvature at the center of the wound body of the battery element. In addition, a highly reliable sealed battery having excellent electrical characteristics and high reliability can be provided.
【図面の簡単な説明】
【図１】図１は、本発明の一実施例を説明する図であ
る。
【図２】図２は、本発明の他の実施例を説明する図であ
る。
【図３】図３は、本発明の他の実施例を説明する図であ
る。
【図４】図４は、本発明の密閉型電池に用いる電極を説
明する図である。
【図５】図５は、圧縮装置による圧縮方法を説明する図
である。
【図６】図６は、従来の巻回型の密閉型電池を説明する
図である。
【図７】図７は、従来の巻回型の密閉型電池を説明する
図である。
【符号の説明】
１…電池要素、２…正極電極、３…負極電極、４…セパ
レータ、５…中心部曲面、１０…中心部曲面、１１…負
極集電体、１２…内側活物質層、１３…外側活物質層、
１４…中心部曲面、１５…内側活物質層、１６…外側活
物質層、２１…正極活物質層、２２…厚みの薄い部分、
２３…傾斜部、３０…塗布装置、３１…バックアップロ
ール、３２…活物質層形成組成物、３３…ドクター、３
４…シャッター、３５…カム、４０…圧縮装置、４１…
ロールBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an embodiment of the present invention. FIG. 2 is a diagram illustrating another embodiment of the present invention. FIG. 3 is a diagram for explaining another embodiment of the present invention. FIG. 4 is a diagram illustrating electrodes used in the sealed battery of the present invention. FIG. 5 is a diagram illustrating a compression method by a compression device. FIG. 6 is a diagram illustrating a conventional wound sealed battery. FIG. 7 is a diagram illustrating a conventional wound sealed battery. DESCRIPTION OF SYMBOLS 1 ... Battery element, 2 ... Positive electrode, 3 ... Negative electrode, 4 ... Separator, 5 ... Central curved surface, 10 ... Central curved surface, 11 ... Negative electrode current collector, 12 ... Inner active material layer, 13 ... outer active material layer,
14 ... Central surface, 15 ... Inner active material layer, 16 ... Outer active material layer, 21 ... Positive electrode active material layer, 22 ... Thin portion,
Reference numeral 23: inclined portion, 30: coating device, 31: backup roll, 32: active material layer forming composition, 33: doctor, 3
4 Shutter, 35 Cam, 40 Compression device, 41
roll
フロントページの続き (72)発明者 堀内 丈太郎 栃木県宇都宮市針ヶ谷町484番地 エヌイ ーシーモバイルエナジー株式会社内 Ｆターム(参考） 5H028 CC10 CC12 CC15 HH05 5H050 AA02 AA19 BA17 DA04 FA05 FA06 HA04 Continuation of front page (72) Inventor Jotaro Horiuchi 484 Harigaya-cho, Utsunomiya-shi, Tochigi Within the Mobile Mobile Energy Co., Ltd. F-term (reference) 5H028 CC10 CC12 CC15 HH05 5H050 AA02 AA19 BA17 DA04 FA05 FA06 HA04
Claims (1)
て対向させて巻回あるいは折り曲げた角型電池におい
て、正極電極、負極電極の少なくともいずれか一方は、
導電性基体上に形成された塗布層を有し、曲面部あるい
は折り曲げ部の少なくとも一部の内側の塗布層の厚み
は、曲面部あるいは折り曲げ部以外の部分の塗布層の厚
みよりも小さいことを特徴とする密閉型電池。Claims 1. In a prismatic battery in which a positive electrode and a negative electrode are wound or bent with a separator interposed therebetween with at least one of a positive electrode and a negative electrode,
Having a coating layer formed on the conductive substrate, the thickness of the coating layer inside at least a part of the curved surface portion or the bent portion is smaller than the thickness of the coating layer other than the curved surface portion or the bent portion. Features sealed batteries.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001235916A JP2003045474A (en) | 2001-08-03 | 2001-08-03 | Sealed battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001235916A JP2003045474A (en) | 2001-08-03 | 2001-08-03 | Sealed battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2003045474A true JP2003045474A (en) | 2003-02-14 |
Family
ID=19067278
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001235916A Pending JP2003045474A (en) | 2001-08-03 | 2001-08-03 | Sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003045474A (en) |
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