JP2002208380A - Battery and its manufacturing method - Google Patents
Battery and its manufacturing methodInfo
- Publication number
- JP2002208380A JP2002208380A JP2001001384A JP2001001384A JP2002208380A JP 2002208380 A JP2002208380 A JP 2002208380A JP 2001001384 A JP2001001384 A JP 2001001384A JP 2001001384 A JP2001001384 A JP 2001001384A JP 2002208380 A JP2002208380 A JP 2002208380A
- Authority
- JP
- Japan
- Prior art keywords
- battery
- battery case
- annular groove
- opening
- cylindrical
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、電池ケース内に電
極群や電解液等の発電要素を封入してなる密閉型の電池
とその製造方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealed battery in which a power generation element such as an electrode group and an electrolyte is sealed in a battery case, and a method for manufacturing the same.
【0002】[0002]
【従来の技術】近年では、各種ポータブル型の電気機器
の発達に伴い、その駆動電源となる電池が重要なキーデ
バイスの1つとしてその開発が重要視されている。その
電池のうちでも充電可能なニッケル水素蓄電池やリチウ
ムイオン二次電池といった小型二次電池は、携帯電話や
ノートパソコンあるいはビデオカメラ等を始めとして、
近年ではハイブリッド電気自動車の駆動電源等としての
用途にも開発が進み、益々その需要が拡がりつつある。2. Description of the Related Art In recent years, with the development of various types of portable electric equipment, development of a battery serving as a driving power source has been regarded as important as one of the important key devices. Among these batteries, small rechargeable batteries such as rechargeable nickel-metal hydride batteries and lithium-ion rechargeable batteries are widely used in mobile phones, notebook computers, video cameras, etc.
In recent years, development has been advanced for use as a drive power source of a hybrid electric vehicle, and the demand has been increasing.
【0003】このような電池は、円筒型と角型とに大別
される。円筒型電池は、帯状の正極板1と負極板2との
間にセパレータ3を介在させた電極群4を渦巻き状に巻
回して電池ケース5内に収容する(本実施形態を示す図
2参照)構造のため、単位体積当たりのエネルギ密度が
高い。一方、角型電池は図7に示すように、正極板1と
負極板2との間にセパレータ3を介在させた電極群4を
積層して電池ケース5内に収容する構造が一般的であ
り、この点を比較すれば円筒型電池は生産性に優れ、低
コストである。ところが、複数本をパックケースに収容
して電池パックを構成する場合等では円筒型電池は、無
駄な残空間つまりデッドスペースが多くなって空間効率
が悪い(本実施形態の比較例を示す図5参照)上に、収
納空間内での安定性も悪いので、電気機器の小型化や薄
型化に対し不向きである。[0003] Such batteries are roughly classified into a cylindrical type and a square type. In the cylindrical battery, an electrode group 4 having a separator 3 interposed between a strip-shaped positive electrode plate 1 and a negative electrode plate 2 is spirally wound and housed in a battery case 5 (see FIG. 2 showing this embodiment). ) Due to the structure, the energy density per unit volume is high. On the other hand, as shown in FIG. 7, a prismatic battery generally has a structure in which an electrode group 4 in which a separator 3 is interposed between a positive electrode plate 1 and a negative electrode plate 2 is stacked and housed in a battery case 5. Comparing this point, the cylindrical battery is excellent in productivity and low in cost. However, in the case where a battery pack is formed by accommodating a plurality of battery packs in a pack case, for example, a cylindrical battery has a wasteful remaining space, that is, a dead space, and thus has poor space efficiency (see FIG. 5 showing a comparative example of this embodiment). In addition, since the stability in the storage space is poor, it is not suitable for miniaturization and thinning of electric equipment.
【0004】これに対し角型電池は、空間効率が高い上
に収納空間内に安定した状態で収容できるものの、前記
積層構造のため、電池容量を高めるために極板の積層枚
数を多くすると接続線6(図7)の数が多くなる等、生
産コストもかかってしまう。その上、円筒型電池と比較
して密閉化が困難であり、信頼性が劣るという短所を有
している。[0004] On the other hand, prismatic batteries have a high space efficiency and can be stably accommodated in a storage space. However, due to the above-mentioned laminated structure, if the number of laminated electrode plates is increased in order to increase the battery capacity, connection is made. For example, the number of the lines 6 (FIG. 7) increases and the production cost increases. In addition, it has the disadvantage that sealing is difficult and the reliability is inferior to cylindrical batteries.
【0005】この密閉化の方法として角型電池では封口
板とケース開口部との接合部をレーザー溶接する方法が
一般的であるが、この方法は製造コストが高くなる上
に、溶接状態を安定化させるためのレーザーの条件管理
が難しく、信頼性が高い方法であるとはいえない。さら
に図7のような角型電池において封口体10と開口部を
円筒型電池と同様にかしめ方式により封口する方法が、
特開昭63−221551号公報等に開示されている。
しかしこの方法では、封口体10により密閉するための
電池ケースの側面への環状溝の形成が困難であり、さら
に角筒状のケース開口端部をかしめる際に各角部にゆが
みが生じやすいため、円筒型電池をかしめる場合よりも
密閉性が低いという問題がある。[0005] As a method of sealing, in a square battery, a method of laser welding a joint between a sealing plate and a case opening is generally used. However, this method increases the manufacturing cost and stabilizes the welding state. It is difficult to control the conditions of the laser to make the laser lighter, and it cannot be said that the method is highly reliable. Further, in a rectangular battery as shown in FIG. 7, a method of closing the sealing body 10 and the opening by a caulking method in the same manner as the cylindrical battery,
It is disclosed in JP-A-63-221551 and the like.
However, according to this method, it is difficult to form an annular groove in the side surface of the battery case for hermetic sealing with the sealing body 10, and further, when the end portion of the rectangular tubular case is swaged, distortion is likely to occur at each corner. Therefore, there is a problem that the sealing performance is lower than in the case where the cylindrical battery is crimped.
【0006】そこで図9に示すように角筒状の胴部12
を有する電池ケースの開口頭部11を円筒状に形成し、
その円筒状部分をかしめる方法が考えられる。このかし
め方法として、例えば特開昭58−112259号公報
に開示されているかしめ方法(図8を参照)を用いた電
池の製造方法を説明する。Therefore, as shown in FIG.
The opening head 11 of the battery case having a cylindrical shape;
A method of caulking the cylindrical portion is conceivable. As this caulking method, for example, a method of manufacturing a battery using a caulking method (see FIG. 8) disclosed in Japanese Patent Application Laid-Open No. 58-112259 will be described.
【0007】電池ケース5に前記電極群を収容後、ホル
ダ部7に電池ケース5の底部を挿入し、電池ケース5を
その底部側から軸方向に押圧力を付与した状態で、上部
固定部8にて電池ケース5の開口部を固定化し、その後
所定の回転数で上部固定部8を回転させて電池ケース5
を回転させる。この状態で、電池ケース5を底部側から
軸方向に押圧しながら、溝付け用ローラ9を所定の圧力
で電池ケース5の側面に圧接することによって開口部近
傍に環状溝5aを形成する。そしてこの環状溝5aの形
成により内方に膨出した環状支持部5bに封口体10
(図9)を支持させると共に、電池ケース5の開口部を
内方に折り曲げて、この開口端部と前記環状支持部5b
との間に封口体10をかしめ固定することにより電池内
を密閉している。After the electrode group is accommodated in the battery case 5, the bottom of the battery case 5 is inserted into the holder 7, and the battery case 5 is pressed from the bottom side in the axial direction with the upper fixing portion 8 To fix the opening of the battery case 5, and then rotate the upper fixing portion 8 at a predetermined rotation speed to
To rotate. In this state, while pressing the battery case 5 from the bottom side in the axial direction, the groove forming roller 9 is pressed against the side surface of the battery case 5 with a predetermined pressure to form the annular groove 5a near the opening. The annular support 5b bulged inward by the formation of the annular groove 5a is inserted into the sealing body 10b.
(FIG. 9), the opening of the battery case 5 is bent inward, and the opening end and the annular support portion 5b are bent.
The inside of the battery is hermetically sealed by caulking and fixing the sealing body 10 in between.
【0008】[0008]
【発明が解決しようとする課題】ところが上記従来例に
用いる環状溝の形成方法を、図9に示すような角筒状の
胴部12と円筒状の開口頭部11を有する電池の製造方
法に用いた場合には、電池ケース5の底部側から軸方向
に押圧力が付与されているので、角筒状の胴部12側か
ら環状溝5aへの材料供給がスムーズに行われないた
め、環状溝5aを開口頭部11と胴部12の境界部に形
成した場合には、材料供給が殆ど無い状態で溝付け用ロ
ーラ9によって局部的に延ばされてしまい、その部分の
肉厚が薄くなり変形や切断という問題が生じる。However, the method of forming the annular groove used in the above-mentioned conventional example is changed to a method of manufacturing a battery having a square tubular body 12 and a cylindrical opening head 11 as shown in FIG. When used, since the pressing force is applied in the axial direction from the bottom side of the battery case 5, the material is not smoothly supplied to the annular groove 5a from the rectangular cylindrical body 12 side. When the groove 5a is formed at the boundary between the opening head 11 and the body 12, the material is locally extended by the grooving roller 9 with almost no material supply, and the thickness of that portion is thin. This causes problems such as deformation and cutting.
【0009】そこで、電池ケース5の底部側から押圧す
る従来の方法により、環状溝5aを形成する場合には、
材料供給のために環状溝5aの下部にいくらかの円筒状
部分5cを残した状態(本実施形態との比較例図6
(b)参照)で環状溝5aを形成させなければならず、
環状溝5aの下部の円筒状部分5cの内側は無駄な空間
となり、電池ケース5の内部空間の損失という問題が生
じる。Therefore, when the annular groove 5a is formed by a conventional method of pressing from the bottom side of the battery case 5,
A state in which some cylindrical portions 5c are left under the annular groove 5a for material supply (see FIG.
(See (b))) to form the annular groove 5a,
The inside of the cylindrical portion 5c below the annular groove 5a is a useless space, which causes a problem of loss of the internal space of the battery case 5.
【0010】そこで本発明は、複数本を収納する際の空
間効率が良い角型電池の特徴を活かした上で、電池ケー
スの内部空間の損失を招かない位置に形成した環状溝を
利用したかしめ加工により、信頼性の高い密閉化を行え
ることのできる電池とその製造方法を提供することを目
的とする。Therefore, the present invention takes advantage of the features of a rectangular battery having a good space efficiency when storing a plurality of batteries, and uses an annular groove formed at a position that does not cause loss of the internal space of the battery case. An object of the present invention is to provide a battery capable of performing highly reliable sealing by processing and a method for manufacturing the battery.
【0011】[0011]
【課題を解決するための手段】上記目的を達成するため
に本発明の電池は、電池ケースの角筒状の胴部内に電極
群および電解液が収容され、前記電池ケースの円筒状の
開口頭部側面に環状溝が形成されることによって内方に
膨出した環状支持部に、封口体が支持されると共に、電
池ケースの開口端部を内方に折り曲げ、この開口端部と
前記環状支持部との間に前記封口体をかしめ固定するこ
とにより密閉された電池であって、前記環状溝は、円筒
状の開口頭部と角筒状の胴部の境界部に位置しているこ
とを特徴としている。In order to achieve the above object, a battery according to the present invention comprises a battery case in which an electrode group and an electrolyte are accommodated in a rectangular cylindrical body, and a cylindrical opening of the battery case. The sealing body is supported by the annular support portion that bulges inward due to the formation of the annular groove on the side surface of the battery case, and the open end of the battery case is bent inward. Wherein the annular groove is located at a boundary between a cylindrical opening head and a rectangular tubular body. Features.
【0012】この電池によれば、空間効率が高く収納空
間内に安定した状態で収容できる角型電池の特徴を発揮
しながら、円筒状の開口頭部に環状溝が形成され、その
環状溝の形成により内方に膨出した環状支持部と電池ケ
ースの開口端部との間に、円筒型電池と同様のかしめ方
式により封口体がかしめ固定されているので、封口が容
易であり密閉性にも優れたものとなる。また環状溝は、
円筒状の開口頭部と、電極群と電解液が収容される角筒
状の胴部との境界部に位置しているので、電池ケースの
内部空間の損失が少ない。According to this battery, an annular groove is formed in the cylindrical opening head while exhibiting the characteristics of a rectangular battery which has a high space efficiency and can be stably housed in the housing space. The sealing body is caulked and fixed by the same caulking method as that of the cylindrical battery between the annular support bulging inward by the formation and the opening end of the battery case, so that the sealing is easy and the airtightness is improved. Will also be excellent. The annular groove is
Since it is located at the boundary between the cylindrical opening head and the prismatic body that contains the electrode group and the electrolytic solution, loss of the internal space of the battery case is small.
【0013】上記電池において、電池ケースの胴部の各
角部を所定のアール形状に形成した略正方形状の横断面
形状を有するようにすれば、ケース加工が容易であると
共に、前記円筒状の開口頭部や前記環状溝の形成の際に
塑性変形が容易であり、過充電や過放電時の内圧上昇に
対する耐圧性にも優れている。また、複数個を並置状態
でパックケースに収納して電池パックを構成する場合ま
たは電気機器の電池収納部に収納する場合に、電池同士
が互いに接触した際に損傷や打痕が発生するといった不
具合を未然に防止できる。In the above battery, if each corner of the body of the battery case has a substantially square cross-sectional shape in which a predetermined round shape is formed, the case can be easily processed and the cylindrical shape can be obtained. Plastic deformation is easy during the formation of the opening head and the annular groove, and the pressure resistance against an increase in internal pressure during overcharge or overdischarge is excellent. In addition, when a plurality of batteries are housed side by side in a pack case to form a battery pack or when housed in a battery housing of an electric device, damage or dents occur when batteries come into contact with each other. Can be prevented beforehand.
【0014】また上記電池において、電極群を、帯状の
正極板と負極板との間にセパレータを介在させて巻回
し、電池ケースの胴部の横断面形状に対応した横断面形
状に形成すれば、生産性が良くなり、単位体積当たりの
エネルギ密度が高くなる。In the above battery, the electrode group may be wound with a separator interposed between the belt-like positive electrode plate and the negative electrode plate to form a cross-sectional shape corresponding to the cross-sectional shape of the body of the battery case. The productivity is improved, and the energy density per unit volume is increased.
【0015】上記目的を達成するために本発明の電池の
製造方法は、横断面形状が各角部に所定のアール形状部
を有する略正方形状の電池ケース内に電極群を収容し、
前記電池ケースの開口頭部を円筒状に圧縮成形した後、
電池ケースに開口部側から軸方向に押圧力を付与した状
態で、電池ケースを回転させながら溝付け用ローラを、
前記開口頭部の側面に側方から押し付けることによって
環状溝を形成し、その内方に膨出した環状支持部に、封
口体を支持させた後に電解液を注入し、電池ケースの開
口端部を内方に折り曲げ、この開口端部と前記環状支持
部との間に前記封口体をかしめ固定することにより電池
内を密閉することを特徴としている。In order to achieve the above object, a method of manufacturing a battery according to the present invention is characterized in that a group of electrodes is accommodated in a substantially square battery case having a predetermined rounded portion at each corner.
After compression molding the opening head of the battery case into a cylindrical shape,
While applying a pressing force to the battery case from the opening side in the axial direction, rotate the grooved roller while rotating the battery case.
An annular groove is formed by pressing against the side surface of the opening head from the side, and an annular electrolyte is injected into the annular support portion bulging inward after supporting the sealing body, and the opening end of the battery case is opened. Is bent inward, and the inside of the battery is sealed by caulking and fixing the sealing body between the opening end and the annular support portion.
【0016】この電池の製造方法によれば、円筒状の開
口頭部に環状溝を形成し、その環状溝の形成により内方
に膨出した環状支持部と電池ケースの開口端部との間
に、円筒型電池と同様のかしめ方式により封口体をかし
め固定させることができるので、封口が容易であり密閉
性にも優れた電池を、空間効率が高く収納空間内に安定
した状態で収容できる角型電池の特徴を維持した上で製
造することができる。また、電池ケースの開口部側から
押圧しながら環状溝を形成しているので、環状溝を形成
するための充分な材料の供給を図ることができ、ほぼ均
一な肉厚で寸法安定性に優れた環状溝を、円筒状の開口
頭部と角筒状の胴部との境界部に確実に形成することが
できる。したがって、底部側から押圧していた従来例の
ように境界部の下部に材料供給のための円筒状部分を残
す必要がなく、電池ケースの内部空間の損失が少なくな
る。しかも電極群を、横断面が各角部に所定のアール形
状部を有する略正方形状の電池ケースに収容するので、
前記円筒状の開口頭部や前記環状溝の形成の際に塑性変
形が容易になるし、また過充電や過放電時の内圧上昇に
対する耐圧性にも優れ、複数個を並置状態でパックケー
スに収納して電池パックを構成する場合または電気機器
の電池収納部に収納する場合に、電池同士が互いに接触
した際に損傷や打痕が発生するといった不具合を未然に
防止できる電池を製造することができる。According to this battery manufacturing method, the annular groove is formed in the cylindrical opening head, and the annular groove is formed between the annular support bulged inward by the formation of the annular groove and the open end of the battery case. In addition, since the sealing body can be caulked and fixed by the same caulking method as the cylindrical battery, the battery that is easily sealed and has excellent sealing performance can be stably housed in the storage space with high space efficiency. It can be manufactured while maintaining the characteristics of the prismatic battery. In addition, since the annular groove is formed while being pressed from the opening side of the battery case, it is possible to supply a sufficient amount of material for forming the annular groove, and to have a substantially uniform thickness and excellent dimensional stability. The formed annular groove can be reliably formed at the boundary between the cylindrical opening head and the rectangular cylindrical body. Therefore, there is no need to leave a cylindrical portion for supplying the material below the boundary as in the conventional example pressed from the bottom side, and the loss of the internal space of the battery case is reduced. In addition, since the electrode group is housed in a substantially square battery case having a predetermined round shape at each corner,
Plastic deformation is facilitated during the formation of the cylindrical opening head or the annular groove, and the pressure resistance against internal pressure rise at the time of overcharge or overdischarge is excellent. In the case where the battery pack is housed to form a battery pack or when housed in the battery housing section of an electric device, it is possible to manufacture a battery that can prevent damages and dents when the batteries come into contact with each other. it can.
【0017】尚、前記アール形状部の曲率半径を例えば
4〜7mmに設定すると好適である。It is preferable that the radius of curvature of the rounded portion is set to, for example, 4 to 7 mm.
【0018】また上記方法において、電極群を、帯状の
正極板と負極板との間にセパレータを介在させて巻回し
て円柱状とした後、これが電池ケースの横断面形状に対
応した横断面形状となるように圧縮成形を施してから、
電池ケース内に圧入状態で挿入すれば、その挿入の際に
緊迫度が僅かに緩んで円形状への復元力で膨れ出る状態
に僅かに変形し、上述したアール形状部の内側にデッド
スペースを残さずに電池ケースの内面に対しそれぞれ密
接することにより、単位体積当たりのエネルギ密度が高
い電池を生産性良く製造することができる。Further, in the above method, the electrode group is wound into a columnar shape with a separator interposed between a strip-shaped positive electrode plate and a strip-shaped negative electrode plate. After performing compression molding so that
If it is inserted into the battery case in a press-fitted state, the degree of tension is slightly loosened at the time of insertion and it is slightly deformed into a state of swelling due to the restoring force to a circular shape, and a dead space inside the above-mentioned round shape portion By closely contacting the inner surface of the battery case without leaving any, a battery having a high energy density per unit volume can be manufactured with high productivity.
【0019】[0019]
【発明の実施の形態】以下、本発明の好ましい実施の形
態について図面を参照しながら具体的に説明する。尚、
従来例と同様の部分は同符号を付して説明する。また本
発明は下記実施形態に限定されるものではなく、その要
旨を変更しない範囲において適宜変更して実施すること
が可能なものである。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below with reference to the drawings. still,
The same parts as those in the conventional example will be described with the same reference numerals. In addition, the present invention is not limited to the following embodiments, and can be implemented with appropriate changes within the scope of the present invention.
【0020】図1は本発明の実施形態の電池を示す斜視
図、図2は図1のA−A’線断面図である。この電池
は、各角部が所定のアール形状に形成された略正方形状
の横断面形状を有する有底角筒状の電池ケース5の胴部
12の内部に、帯状の正極板1と負極板2とこれらの間
にセパレータ3を介在して巻回してなる電極群4が収容
され、電池ケース5内に電解液が注入される。FIG. 1 is a perspective view showing a battery according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA 'of FIG. This battery has a band-shaped positive electrode plate 1 and a negative electrode plate inside a body 12 of a bottomed rectangular cylindrical battery case 5 having a substantially square cross-sectional shape in which each corner is formed in a predetermined round shape. 2 and a group of electrodes 4 wound with a separator 3 interposed therebetween are accommodated, and an electrolyte is injected into the battery case 5.
【0021】電池ケース5の開口頭部11は円筒状に形
成され、その側面に形成した環状溝5aにより内方に膨
出した環状支持部5bに、絶縁ガスケット13を介して
封口体10が載置支持された後、開口頭部11の開口端
部を内方に折り曲げ、この開口端部と環状支持部5bと
の間に封口体10をかしめ固定することにより、電池内
が密閉された構造になっている。The opening head 11 of the battery case 5 is formed in a cylindrical shape, and the sealing body 10 is mounted via an insulating gasket 13 on an annular support portion 5b bulging inward by an annular groove 5a formed on the side surface thereof. After being placed and supported, the opening end of the opening head 11 is bent inward, and the sealing body 10 is caulked and fixed between the opening end and the annular support portion 5b, whereby the inside of the battery is sealed. It has become.
【0022】電極群4は、それぞれ帯状となった正極板
1、負極板2およびセパレータ3を渦巻き状に巻回して
円柱状とした後に、これに金型による圧縮成形を施すこ
とにより、電池ケース5の横断面形状に対応する略正方
形状にして、電池ケース5内に圧入状態で挿入されてい
る。これにより、電極群4は胴部12内に挿入されたと
きに、緊迫度が僅かに緩んで元の円形状への復元力で膨
れ出る状態に僅かに変形して、電池ケース5の内面に対
しそれぞれ密接する。The electrode group 4 is formed by spirally winding a strip of the positive electrode plate 1, the negative electrode plate 2, and the separator 3 into a columnar shape, and then performing compression molding with a mold on the battery case. 5, and is inserted into the battery case 5 in a press-fit state. As a result, when the electrode group 4 is inserted into the body portion 12, the electrode group 4 slightly deforms to a state in which the degree of tension is slightly loosened and swells due to a restoring force to the original circular shape, and Against each other.
【0023】またこの電池は、電池ケース5の各角部が
所定のアール形状、例えば曲率半径が4〜7mmに形成
されたアール形状部5dを有しているので、ケース加工
が容易であると共に、円筒状の開口頭部11や環状溝5
aの形成の際に塑性変形が容易であり、過充電や過放電
時の内圧上昇に対する耐圧性にも優れている。また上述
のように円柱状に巻回した電極群4を圧縮成形して電池
ケース5内に圧入する際にもデッドスペースを残さな
い。さらに図5に後述するように、複数個を並置状態で
パックケースに収納して電池パック17を構成する場合
または電気機器の電池収納部に収納する場合には、電池
同士が互いに接触した際に損傷や打痕が発生するといっ
た不具合を未然に防止できる。In this battery, since each corner of the battery case 5 has a predetermined radius shape, for example, a radius-shaped portion 5d having a radius of curvature of 4 to 7 mm, the case processing is facilitated. , Cylindrical opening head 11 and annular groove 5
It is easy to plastically deform when forming a, and has excellent pressure resistance against internal pressure rise during overcharge or overdischarge. Further, even when the electrode group 4 wound in a columnar shape as described above is compression molded and pressed into the battery case 5, no dead space is left. Further, as described later in FIG. 5, when a plurality of batteries are housed side by side in a pack case to form the battery pack 17 or when housed in a battery housing of an electric device, when the batteries come into contact with each other, Problems such as damage and dents can be prevented beforehand.
【0024】図3は、本実施形態の製造方法を工程順に
示した斜視図である。まず、(a)に示すように、電池
ケース5を上述したようなアール形状部5dを有する横
断面形状が略正方形状の有底角筒状に形成する。そして
電極群4を、正極板1と負極板2とこれらの間にセパレ
ータ3を介在して重ね合わせた状態で渦巻き状に巻回し
た後に、電池ケース5の横断面形状に対応する横断面略
正方形状に圧縮成形する。この電極群4の上端面には、
正極集電体16が溶接され、正極集電体16の上には上
方に突出した正極リード片14が溶接されている。ま
た、電極群4の下端面には、負極リード片15と一体に
なった負極集電体(図2)が下方に溶接されている。こ
のように形成された電極群4を電池ケース5内に挿入す
る。FIG. 3 is a perspective view showing the manufacturing method of this embodiment in the order of steps. First, as shown in (a), the battery case 5 is formed in the shape of a bottomed rectangular tube having a substantially square cross section and having a rounded portion 5d as described above. After the electrode group 4 is spirally wound in a state where the electrode group 4 is overlapped with the positive electrode plate 1 and the negative electrode plate 2 and the separator 3 interposed therebetween, the cross section corresponding to the cross sectional shape of the battery case 5 is substantially reduced. Compression molding into a square shape. On the upper end surface of this electrode group 4,
The positive electrode current collector 16 is welded, and a positive electrode lead piece 14 projecting upward is welded onto the positive electrode current collector 16. On the lower end surface of the electrode group 4, a negative electrode current collector (FIG. 2) integrated with the negative electrode lead piece 15 is welded downward. The electrode group 4 thus formed is inserted into the battery case 5.
【0025】電極群4を電池ケース5内に挿入した後
に、電極群4の中央の孔から溶接用電極棒を挿入して、
負極集電体15のリード片を押圧させて下方に突出させ
ると共に電池ケース5の底面に抵抗溶接させる。After inserting the electrode group 4 into the battery case 5, a welding electrode rod is inserted from the center hole of the electrode group 4,
The lead piece of the negative electrode current collector 15 is pressed so as to project downward, and is resistance-welded to the bottom surface of the battery case 5.
【0026】次に、電池ケース5に対し、その開口部の
近傍箇所に対して金型による圧縮成形が施して、(b)
に示すように、円筒状の開口頭部11を形成し、その内
側に絶縁ガスケット13を嵌め込む。Next, the battery case 5 is subjected to compression molding by a metal mold at a portion near the opening, and (b)
As shown in (1), a cylindrical opening head 11 is formed, and an insulating gasket 13 is fitted inside the opening head.
【0027】その後、(c)に示すように開口頭部11
の側面に環状溝5aを形成し、電池ケース5内に電極群
4を固定するが、環状溝5aの形成方法について図4を
参照して説明する。Thereafter, as shown in FIG.
The electrode group 4 is fixed in the battery case 5 by forming an annular groove 5a on the side surface of the battery case 5. A method of forming the annular groove 5a will be described with reference to FIG.
【0028】まずホルダ部7に電池ケース5の底部を挿
入した後、上部固定部8をホルダ部7に所定の圧力で押
圧し、上部固定部8にて開口頭部11を固定化し、所定
の回転数でホルダ部7を回転させて電池ケース5を回転
させる。この状態で電池ケース5を開口部側から軸方向
に所定の押圧力を付与した状態で、電池ケース5を回転
させながら溝付け用ローラ9を、開口頭部11の側面に
側方から押し付けることによって環状溝5aを形成す
る。その後、電池ケース5内に、図3(c)に示す電極
群4の中央の孔から所定量のアルカリ電解液を注入した
後、環状溝5aによって内方に膨出した環状支持部5b
に、絶縁ガスケット13を介して封口体10を支持させ
る。First, after the bottom of the battery case 5 is inserted into the holder 7, the upper fixing portion 8 is pressed against the holder 7 with a predetermined pressure to fix the opening head 11 by the upper fixing portion 8, and The battery case 5 is rotated by rotating the holder 7 at the rotation speed. In this state, while the battery case 5 is applied with a predetermined pressing force in the axial direction from the opening side, the groove forming roller 9 is pressed against the side surface of the opening head 11 from the side while rotating the battery case 5. Thereby, an annular groove 5a is formed. Thereafter, a predetermined amount of alkaline electrolyte is injected into the battery case 5 from the center hole of the electrode group 4 shown in FIG. 3C, and then the annular support portion 5b bulged inward by the annular groove 5a.
Next, the sealing body 10 is supported via the insulating gasket 13.
【0029】そしてこの状態で図3(d)に示すよう
に、開口頭部11の開口端部を内方に折り曲げ、この開
口端部と環状支持部5bとの間に封口体10をかしめ固
定することにより、電池内を密閉化して電池を構成す
る。In this state, as shown in FIG. 3D, the opening end of the opening head 11 is bent inward, and the sealing body 10 is caulked and fixed between the opening end and the annular support portion 5b. By doing so, the inside of the battery is sealed to form the battery.
【0030】(実施例)以下に本発明の一実施例につい
て詳細な説明を行う。この実施例において電池を以下の
ようにして製作した。(Embodiment) An embodiment of the present invention will be described in detail below. In this example, a battery was manufactured as follows.
【0031】すなわち水酸化ニッケルを活物質として含
む、高さ34mm、幅250mm、厚み0.62mmで
ある帯状の正極板と、水素吸蔵合金を活物質として含
む、高さ34mm、幅310mm、厚み0.36mmで
ある帯状の負極板とを親水化処理を施したポリプロピレ
ン製のセパレータを介在させて巻回し、上部に正極集電
体を下部に負極集電体を溶接して電極群を構成した。That is, a band-shaped positive electrode plate having a height of 34 mm, a width of 250 mm and a thickness of 0.62 mm containing nickel hydroxide as an active material, and a height of 34 mm, a width of 310 mm and a thickness of 0 containing a hydrogen storage alloy as an active material. An electrode group was formed by winding a band-shaped negative electrode plate having a width of .36 mm with a polypropylene separator subjected to a hydrophilic treatment interposed therebetween, and welding a positive electrode current collector on the upper part and a negative electrode current collector on the lower part.
【0032】電池ケースとしては、各角部をR6でアー
ル形状にした1辺21mmの略正方形状の断面を有する
肉厚0.3mm、高さ45mmである鉄にニッケルメッ
キを施した金属製ケースを用いて、図3で説明した製造
工程および図4で説明した環状溝の形成方法によって電
池を製作した。尚、開口頭部11は上部7mmにあたる
部分までを直径21mmの円筒状に圧縮成形を施した。As the battery case, a metal case made of nickel-plated iron having a thickness of 0.3 mm and a height of 45 mm having a substantially square cross section of 21 mm on a side with each corner formed in a round shape of R6. Using the method described above, a battery was manufactured by the manufacturing process illustrated in FIG. 3 and the method of forming the annular groove illustrated in FIG. Note that the opening head 11 was compression-molded into a cylindrical shape having a diameter of 21 mm up to a portion corresponding to 7 mm in the upper part.
【0033】上記によって得られた電池に初充放電を行
い、高さ42mm、横断面の正方形の1辺が21mm、
標準容量3600mAhである電池Aを製作した。The battery obtained as described above was subjected to initial charge / discharge, and a height of 42 mm, a side of a square having a cross section of 21 mm,
Battery A having a standard capacity of 3600 mAh was manufactured.
【0034】(比較例1)上記のようにして製作した電
池Aと、比較例として高さ42mm、直径21mm、標
準容量3000mAhである円筒型電池Bを、組電池と
した際の電池パック17内での空間効率の違いを以下に
比較する。COMPARATIVE EXAMPLE 1 A battery pack 17 was prepared by combining a battery A manufactured as described above and a cylindrical battery B having a height of 42 mm, a diameter of 21 mm and a standard capacity of 3000 mAh as a comparative example. The differences in space efficiency in the following are compared.
【0035】1例として図5に、電動工具用の電池パッ
ク17に電池Aと比較例の電池Bをそれぞれ9本ずつ収
納した場合をそれぞれ(a)、(b)に示している。電
池Bの場合と比べて、本実施例の電池Aを収納した電池
パック17は、残空間が少なく空間効率が優れていると
云う角型電池の特徴を発揮している。しかも、本実施例
の電池Aは、上記実施形態で示したようにアール形状部
5dを有しているので、このような電池パック17を構
成する場合または電気機器の電池収納部に収納する場合
に、電池同士が互いに接触した際に損傷や打痕が発生す
るといった不具合を未然に防止できる。その上、一般的
な円筒型電池のかしめ方式を採用できるように、開口頭
部11を円筒状にし、その円筒状部分を封口するための
環状溝5aの形成方法を、環状溝5aより下方が角筒状
をした電池の形状を考慮して押圧方向を変えているの
で、胴部12が角筒状の角型電池の構造を有しながら生
産性が良く、封口部分への信頼性が高い円筒型電池の特
徴も発揮できる。As an example, FIGS. 5 (a) and (b) show a case where nine batteries A and nine batteries B of the comparative example are stored in the battery pack 17 for a power tool, respectively. Compared with the case of the battery B, the battery pack 17 containing the battery A of the present embodiment exhibits the feature of a rectangular battery that has a small remaining space and excellent space efficiency. In addition, since the battery A of the present example has the rounded portion 5d as shown in the above embodiment, when the battery pack 17 is configured or stored in the battery storage portion of the electric device. In addition, it is possible to prevent problems such as damage and dents when batteries come into contact with each other. In addition, the opening head 11 is formed into a cylindrical shape so that a general cylindrical battery caulking method can be employed, and the method of forming the annular groove 5a for sealing the cylindrical portion is described below. Since the pressing direction is changed in consideration of the shape of the prismatic battery, the productivity is good while the body 12 has the structure of the prismatic battery with the prismatic shape, and the reliability to the sealing portion is high. The characteristics of cylindrical batteries can also be demonstrated.
【0036】以下、この環状溝部分の構造について従来
の環状溝の形成方法を用いたものと比較して説明する。Hereinafter, the structure of the annular groove portion will be described in comparison with a structure using a conventional annular groove forming method.
【0037】(比較例2)この比較例2においては、環
状溝を形成するために、従来例の図8で示したような電
池ケースの底部側から押圧(実施例では図4で示したよ
うに電池ケースの開口部側から押圧)した状態で、溝付
け用ローラを開口頭部と胴部との境界部の側面に圧接さ
せる方法を採ったこと以外は、上記実施例と同様の方法
にて電池を製作した。(Comparative Example 2) In Comparative Example 2, in order to form an annular groove, pressing was performed from the bottom side of the battery case as shown in FIG. 8 of the conventional example (in the example, as shown in FIG. 4). In the same manner as in the above embodiment, except that the groove-forming roller is pressed against the side surface of the boundary between the opening head and the body in the state of being pressed from the opening side of the battery case. Battery.
【0038】その結果、底部側からは材料が殆ど供給さ
れないので、環状溝の部分が溝付け用ローラによって局
部的に延ばされてしまい、肉厚が均一にならないために
その一部が切断したり、あるいは変形したりするものが
多発し、安定した環状溝を形成させることができなかっ
た。そのため、開口頭部が円筒状で胴部が角筒状の電池
に環状溝を形成するには、図1のB−B’線で断面した
要部拡大図である図6(b)に示すように、材料供給の
ために環状溝5aの下部にいくらかの円筒状部分5cを
残した状態で環状溝5aを形成させなければならない
が、これでは環状溝5aの下部の円筒状部分5cの内側
は無駄な空間となり、電池ケース5の内部空間の損失と
いう問題が生じていた。そこで本実施例では図6(a)
に示すように、電池ケース5の開口部側から押圧するこ
とで環状溝5aを形成するための充分な材料供給を図る
ことができるので、円筒状の開口頭部11と角筒状の胴
部12との境界部に、均一な肉厚を確保し、寸法安定性
に優れた環状溝5aを確実に形成することができ、前記
内部空間の損失が少なくなる。As a result, since little material is supplied from the bottom side, the annular groove portion is locally extended by the grooving roller, and a portion thereof is cut off because the thickness is not uniform. Many of them were deformed or deformed, and a stable annular groove could not be formed. For this reason, in order to form an annular groove in a battery having a cylindrical opening head and a square tubular body, FIG. 6B is an enlarged view of a main part taken along line BB ′ of FIG. As described above, the annular groove 5a must be formed with some cylindrical portion 5c left under the annular groove 5a for material supply, but this requires the inside of the cylindrical portion 5c below the annular groove 5a. Is a wasteful space, and there is a problem that the internal space of the battery case 5 is lost. Therefore, in this embodiment, FIG.
As shown in FIG. 5, a sufficient material supply for forming the annular groove 5a can be achieved by pressing from the opening side of the battery case 5, so that the cylindrical opening head 11 and the square tubular body 12, a uniform thickness can be ensured, the annular groove 5a having excellent dimensional stability can be reliably formed, and the loss of the internal space is reduced.
【0039】尚、上記実施例では正極板にニッケル極を
用い、負極板に水素吸蔵合金極を用いたニッケル水素蓄
電池の場合について説明を行ったが、他の電池、例えば
ニッケルカドミウム蓄電池やリチウムイオン二次電池等
についても同様の効果が得られる。In the above embodiment, a nickel-metal hydride storage battery using a nickel electrode for the positive electrode plate and a hydrogen-absorbing alloy electrode for the negative electrode plate has been described. Similar effects can be obtained for secondary batteries and the like.
【0040】[0040]
【発明の効果】以上のように本発明によれば、複数本を
収納する際の空間効率が良い角型電池の特徴を活かした
上で、円筒状の開口頭部と角筒状の胴部との境界位置に
形成した環状溝を利用したかしめ加工によって、電池ケ
ースの内部空間の損失を少なくし、信頼性の高い密閉化
を行えることのできる電池とその製造方法を提供するこ
とができる。As described above, according to the present invention, while taking advantage of the characteristics of a square battery having good space efficiency when storing a plurality of batteries, a cylindrical opening head and a square tubular body are utilized. A battery capable of reducing the loss of the internal space of the battery case and achieving highly reliable sealing by caulking using an annular groove formed at a boundary position between the battery case and the manufacturing method thereof can be provided.
【図1】本発明の実施形態に係る電池を示す斜視図。FIG. 1 is a perspective view showing a battery according to an embodiment of the present invention.
【図2】図1のA−A’線断面図。FIG. 2 is a sectional view taken along line A-A ′ of FIG. 1;
【図3】同実施形態の製造工程を順に示した斜視図。FIG. 3 is an exemplary perspective view showing the manufacturing steps of the embodiment in order;
【図4】同実施形態に用いる環状溝の形成方法を示す断
面図。FIG. 4 is an exemplary sectional view showing the method of forming the annular groove used in the embodiment;
【図5】本発明の実施例の電池と円筒型電池とを比較し
た上面図。FIG. 5 is a top view comparing the battery of the example of the present invention with a cylindrical battery.
【図6】同実施例の電池と従来の環状溝の形成方法を用
いた角型電池とを比較するため、図1のB−B’線で断
面した要部拡大図。FIG. 6 is an enlarged view of a main part taken along line BB ′ of FIG. 1 to compare the battery of the example with a prismatic battery using a conventional annular groove forming method.
【図7】従来の角型電池の1例を示す斜視図。FIG. 7 is a perspective view showing an example of a conventional prismatic battery.
【図8】円筒型電池に用いる従来の環状溝の形成方法を
示す断面図。FIG. 8 is a cross-sectional view showing a conventional method of forming an annular groove used for a cylindrical battery.
【図9】従来の環状溝の形成方法を用いた角型電池を示
す斜視図。FIG. 9 is a perspective view showing a prismatic battery using a conventional annular groove forming method.
1 正極板 2 負極板 3 セパレータ 4 電極群 5 電池ケース 5a 環状溝 5b 環状支持部 5c 環状溝より下部の円筒状部分(従来例) 5d アール形状部 9 溝付け用ローラ 10 封口体 11 開口頭部 12 胴部 13 絶縁ガスケット 14 正極リード片 15 負極集電体 16 正極集電体 DESCRIPTION OF SYMBOLS 1 Positive electrode plate 2 Negative electrode plate 3 Separator 4 Electrode group 5 Battery case 5a Annular groove 5b Annular support part 5c Cylindrical part below annular groove (conventional example) 5d R-shaped part 9 Slotting roller 10 Sealing body 11 Opening head 12 Body 13 Insulating gasket 14 Positive electrode lead piece 15 Negative current collector 16 Positive current collector
───────────────────────────────────────────────────── フロントページの続き (72)発明者 宮久 正春 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 (72)発明者 坊木 義廣 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Fターム(参考) 5H011 AA03 AA09 AA17 CC06 DD03 DD05 DD06 DD15 KK03 5H028 AA01 AA07 BB01 BB03 BB04 BB07 CC07 CC12 HH05 5H029 AJ14 AJ15 AM01 BJ02 BJ14 CJ01 CJ03 CJ06 CJ07 CJ13 DJ02 DJ14 EJ01 HJ03 HJ12 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masaharu Miyahisa 1006 Kazuma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. F-term (reference) 5H011 AA03 AA09 AA17 CC06 DD03 DD05 DD06 DD15 KK03 5H028 AA01 AA07 BB01 BB03 BB04 BB07 CC07 CC12 HH05 5H029 AJ14 AJ15 AM01 BJ02 BJ14 CJ01 CJ03 CJ06 CJ07 HJ12 DJ02
Claims (6)
よび電解液が収容され、前記電池ケースの円筒状の開口
頭部側面に環状溝が形成されることによって内方に膨出
した環状支持部に、封口体が支持されると共に、電池ケ
ースの開口端部を内方に折り曲げ、この開口端部と前記
環状支持部との間に前記封口体をかしめ固定することに
より密閉された電池であって、前記環状溝は、円筒状の
開口頭部と角筒状の胴部の境界部に位置していることを
特徴とする電池。1. An electrode group and an electrolytic solution are accommodated in a rectangular cylindrical body of a battery case, and swelled inward by forming an annular groove on a side surface of a cylindrical opening of the battery case. The sealing member was supported by the annular support portion, and the opening end of the battery case was bent inward, and the sealing member was caulked and fixed between the opening end portion and the annular support portion, thereby sealing the battery case. A battery according to claim 1, wherein said annular groove is located at a boundary between a cylindrical opening head and a rectangular tubular body.
ール形状に形成された略正方形状の横断面形状を有して
いる請求項1記載の電池。2. The battery according to claim 1, wherein the body of the battery case has a substantially square cross section in which each corner is formed in a predetermined round shape.
にセパレータを介在させて巻回し、電池ケースの胴部の
横断面形状に対応した横断面形状に形成されている請求
項1または2記載の電池。3. The electrode group is wound with a separator interposed between a strip-shaped positive electrode plate and a negative electrode plate, and formed in a cross-sectional shape corresponding to the cross-sectional shape of the body of the battery case. 3. The battery according to 1 or 2.
部を有する略正方形状の電池ケース内に電極群を収容
し、前記電池ケースの開口頭部を円筒状に圧縮成形した
後、電池ケースに開口部側から軸方向に押圧力を付与し
た状態で、電池ケースを回転させながら溝付け用ローラ
を、前記開口頭部の側面に側方から押し付けることによ
って環状溝を形成し、その内方に膨出した環状支持部
に、封口体を支持させた後に電解液を注入し、電池ケー
スの開口端部を内方に折り曲げ、この開口端部と前記環
状支持部との間に前記封口体をかしめ固定することによ
り電池内を密閉することを特徴とする電池の製造方法。4. An electrode group is accommodated in a substantially square battery case having a predetermined rounded portion at each corner, and the opening of the battery case is compression-molded into a cylindrical shape. While applying a pressing force in the axial direction from the opening side to the battery case, the grooved roller is pressed from the side against the side surface of the opening head while rotating the battery case to form an annular groove. After the sealing body is supported on the inwardly swelling annular support portion, the electrolytic solution is injected, and the open end of the battery case is bent inward. A method for producing a battery, comprising sealing the inside of a battery by caulking and fixing a sealing body.
ある請求項4記載の電池の製造方法。5. The method for manufacturing a battery according to claim 4, wherein the radius of curvature of the radius-shaped portion is 4 to 7 mm.
にセパレータを介在させて巻回して円柱状とした後、こ
れが電池ケースの横断面形状に対応した横断面形状とな
るように圧縮成形を施してから、電池ケース内に圧入状
態で挿入する請求項4または5記載の電池の製造方法。6. The electrode group is wound into a column shape with a separator interposed between a strip-shaped positive electrode plate and a negative electrode plate so that the electrode group has a cross-sectional shape corresponding to the cross-sectional shape of the battery case. 6. The method for producing a battery according to claim 4, wherein the battery is subjected to compression molding and then inserted into the battery case in a press-fit state.
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