JPH06260153A - Manufacture of square form sealed battery - Google Patents
Manufacture of square form sealed batteryInfo
- Publication number
- JPH06260153A JPH06260153A JP5039896A JP3989693A JPH06260153A JP H06260153 A JPH06260153 A JP H06260153A JP 5039896 A JP5039896 A JP 5039896A JP 3989693 A JP3989693 A JP 3989693A JP H06260153 A JPH06260153 A JP H06260153A
- Authority
- JP
- Japan
- Prior art keywords
- metal case
- die
- upper opening
- curl
- mold
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は角形密閉電池の製造方法
に関し、特にカール金型の形状を改良した角形密閉電池
の製造方法に係るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a prismatic sealed battery, and more particularly to a method for manufacturing a prismatic sealed battery having an improved curl mold shape.
【０００２】[0002]
【従来の技術】従来の角形密閉電池は、次のような方法
により製造されている。まず、有底角筒形の金属ケース
の上部開口部を拡口して段部を形成する。つづいて、前
記金属ケース内に正極と負極とをセパレータを介して積
層した電極体を収納する。ひきつづき、予め封口板が収
納された底部に矩形の穴を有する有底角筒形の絶縁ガス
ケットを前記金属ケースの前記段部に載置する。次い
で、角筒形の中空部が中央部に設けられ、かつ前記中空
部の下端内周面が外側に拡口して形成された絞りテーパ
部を有する絞り金型を前記金属ケースの前記上部開口部
に挿入し前記金属ケースの前記上部開口部を前記金属ケ
ースの胴部寸法まで縮径することにより前記絶縁ガスケ
ットを内方に圧縮する。ひきつづき、角筒形の中空部が
中央部に設けられ、かつ底部に前記中空部と連通すると
共に前記中空部より寸法の大きい角形凹部が形成された
カール金型を前記金属ケースの前記上部開口部の上端に
当接させて前記金属ケースの前記上部開口部の上端を内
方に折り曲げることにより前記封口板を前記絶縁ガスケ
ットを介して圧縮固定した後、前記中空部を上下動する
ナックアウトで前記封口板を押さえながら前記カール金
型を上昇させることにより前記カール金型を前記金属ケ
ースから取り出す方法により封口される。2. Description of the Related Art Conventional prismatic sealed batteries are manufactured by the following method. First, a step is formed by expanding the upper opening of a bottomed rectangular metal case. Subsequently, the electrode body, in which the positive electrode and the negative electrode are laminated via the separator, is housed in the metal case. Subsequently, a bottomed rectangular tubular insulating gasket having a rectangular hole at the bottom, in which a sealing plate is housed in advance, is placed on the stepped portion of the metal case. Next, a rectangular die is provided in the central part, and a lower end inner peripheral surface of the hollow part has an aperture taper portion formed by expanding the outer side to the upper end of the metal case. Part of the metal case and the upper opening of the metal case is reduced in diameter to the size of the body of the metal case to compress the insulating gasket inward. Continuing on, a curl mold having a square tubular hollow portion provided in the center and a bottom portion communicating with the hollow portion and having a rectangular concave portion having a size larger than the hollow portion is formed into the upper opening portion of the metal case. After the compression of the sealing plate through the insulating gasket by bending the upper end of the upper opening of the metal case in contact with the upper end of the metal case, the hollow portion is moved up and down by a knockout. The curl die is lifted while pressing the sealing plate, and the curl die is taken out from the metal case for sealing.
【０００３】しかしながら、前述した従来のカール金
型、すなわちストレート部が鉛直に設けられていた金型
を用いたカール工程において、前記カール金型の前記凹
部の内周面と前記金属ケースの前記上部開口部の外周全
体とが密着しているため、カール工程終了後前記カール
金型を前記金属ケースから取り外す際に摩擦力が大きく
なり、抜き出しが困難となる。従って、前記カール金型
を取り外す際に前記カール金型を上昇させると共に前記
ナックアウトで前記封口板を下方に強く押圧するため、
前記封口板並びに前記絶縁ガスケットが前記金属ケース
の前記段部よりずれ落ちたり前記絶縁ガスケットに割れ
が生じる。その結果、前記電池の気密性が低下する恐れ
がある。However, in a curling process using the above-mentioned conventional curl mold, that is, a mold in which a straight portion is provided vertically, the inner peripheral surface of the concave portion of the curl mold and the upper portion of the metal case. Since the entire outer periphery of the opening is in close contact, the frictional force becomes large when the curl die is removed from the metal case after the curling step, and it becomes difficult to extract the curl die. Therefore, when the curl die is removed, the curl die is raised and the sealing plate is strongly pressed downward by the knuckout,
The sealing plate and the insulating gasket may slip off the stepped portion of the metal case or the insulating gasket may be cracked. As a result, the airtightness of the battery may decrease.
【０００４】[0004]
【発明が解決しようとする課題】本発明は従来の問題を
解決するためになされたもので、縮径後の金属ケースの
上部開口部の上端を所望形状にカールすることができる
と共にカール金型を金属ケースから容易に取り外すこと
ができ、かつ気密性を向上することが可能な角形密閉電
池の製造方法を提供しようとするものである。SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and it is possible to curl the upper end of the upper opening of a metal case after the diameter is reduced to a desired shape and to curl the mold. An object of the present invention is to provide a method for manufacturing a prismatic sealed battery, which can be easily removed from a metal case and can improve airtightness.
【０００５】[0005]
【課題を解決するための手段】本発明は、上部開口部を
拡口することにより形成された段部を有する有底角筒形
の金属ケース内に発電要素を収納する工程と、予め金属
製封口板が収納された底部に矩形の穴を有する有底角筒
形の絶縁ガスケットを前記金属ケースの前記段部上に載
置する工程と、角筒形の中空部が中央部に設けられ、か
つ前記中空部の下端内周面が外側に拡口して形成された
絞りテーパ部を有する絞り金型を用い、前記絞り金型を
前記金属ケースの前記上部開口部に挿入し前記金属ケー
スの前記上部開口部を前記金属ケースの胴部にほぼ等し
い寸法まで縮径して前記絶縁ガスケットの立上がり壁を
内方に圧縮する工程と、角筒形の中空部が中央部に設け
られ、かつ底部に前記中空部と連通すると共に前記中空
部より寸法の大きい角形凹部が形成されたカール金型を
用い、前記カール金型を前記金属ケースの前記上部開口
部の上端に当接させて前記金属ケースの前記上部開口部
の上端を内方にカーリングすることにより前記封口板を
前記絶縁ガスケットを介して圧縮固定した後、前記中空
部を上下動するナックアウトで前記金属製封口板を押圧
しながら前記カール金型を上昇させることにより前記カ
ール金型を前記金属ケースから取り外す工程とを具備し
た角形密閉電池の製造方法において、前記カール金型の
前記凹部の下端内周面に０．５°〜１０°の抜きテーパ
が形成されていることを特徴とする角形密閉電池の製造
方法である。SUMMARY OF THE INVENTION According to the present invention, a step of housing a power generating element in a metal case having a bottomed rectangular tube shape having a step portion formed by expanding an upper opening portion, and the step of storing the power generating element in advance are made of metal. A step of placing a bottomed rectangular tubular insulating gasket having a rectangular hole in the bottom portion in which the sealing plate is housed on the stepped portion of the metal case, and a hollow portion of the rectangular tubular shape is provided in the central portion, Also, using a diaphragm die having a diaphragm taper portion formed by expanding the inner peripheral surface of the lower end of the hollow portion to the outside, the diaphragm die is inserted into the upper opening of the metal case, and A step of compressing the rising wall of the insulating gasket inward by reducing the diameter of the upper opening to a size approximately equal to the body of the metal case; Communicates with the hollow part and has a size larger than the hollow part. By using a curl mold in which a rectangular recess is formed, the curl mold is brought into contact with the upper end of the upper opening of the metal case, and the upper end of the upper opening of the metal case is curled inward. After the sealing plate is compression-fixed via the insulating gasket, the curl mold is lifted by pressing the metal sealing plate with a knuckout that moves up and down the hollow portion to raise the curl mold to the metal. In the method for manufacturing a prismatic sealed battery, which comprises a step of removing from a case, a prism having a draft of 0.5 ° to 10 ° is formed on an inner peripheral surface of a lower end of the recess of the curl mold. It is a method of manufacturing a sealed battery.
【０００６】前記絞り金型の前記絞りテーパ部は、前記
金属ケースの上部開口部を縮径する観点から、前記中空
部の下端内周面を外側に１°〜５°の範囲の角度で拡口
させて形成することが望ましい。From the viewpoint of reducing the diameter of the upper opening of the metal case, the tapered portion of the diaphragm die expands the inner peripheral surface of the lower end of the hollow portion to the outside at an angle in the range of 1 ° to 5 °. It is desirable to form by mouth.
【０００７】前記カール金型の前記凹部の下端内周面に
形成された抜きテーパの角度を前記範囲に限定したの
は、次のような理由によるものである。前記角度を０．
５°未満にすると、前記カール金型を前記金属ケースか
ら取り外すことが困難になる。これに対し、前記角度が
１０°を越えると、前記金属ケースの前記上部開口部の
上端を折り曲げることが困難になる。The angle of the draft taper formed on the inner peripheral surface of the lower end of the concave portion of the curl mold is limited to the above range for the following reason. If the angle is 0.
If the angle is less than 5 °, it becomes difficult to remove the curl mold from the metal case. On the other hand, when the angle exceeds 10 °, it becomes difficult to bend the upper end of the upper opening of the metal case.
【０００８】本発明は、前記絞り金型の前記中空部の各
コーナのアールの半径をｒ1 とし、前記カール金型の前
記凹部の各コーナのアールの半径をｒ2 とした時、下記
式 ｒ1 ＞ｒ2 を満たす絞り金型及びカール金型を用いることを許容す
る。According to the present invention, when the radius of the radius of each corner of the hollow portion of the drawing die is r 1 and the radius of the radius of each corner of the recess of the curl die is r 2 , the following formula is given: It is allowed to use a drawing die and a curl die satisfying r 1 > r 2 .
【０００９】[0009]
【作用】本発明によれば、角筒形の中空部が中央部に設
けられ、かつ底部に前記中空部と連通すると共に前記中
空部より寸法の大きい角形凹部が形成されたカール金型
の前記凹部の下端内周面に０．５°〜１０°の抜きテー
パを形成し、前記カール金型をかしめ固定のカール工程
にて用いることによって、絞り金型により縮径された金
属ケースの上部開口部の上端を所望形状にカールするこ
とができる。また、前記凹部の下端の内周面に前記抜き
テーパが形成されているため、前記カール金型を前記金
属ケースの前記上部開口部に挿入すると前記金属ケース
の前記上部開口部の下部周縁と前記凹部の下端との接触
面を小さくすることができる。このため、前記カール工
程終了後に前記カール金型を前記金属ケースから容易に
取り外すことができる。その結果、前記封口板の下落や
前記絶縁ガスケットの割れによる電池の気密性の低下を
防ぐことができる。According to the present invention, the curl mold described above is provided with a hollow cylindrical hollow portion at the center thereof, and at the bottom thereof a square recess communicating with the hollow portion and having a larger dimension than the hollow portion. An opening taper of 0.5 ° to 10 ° is formed on the inner peripheral surface of the lower end of the recess, and the curl mold is used in the curling step of caulking and fixing, whereby the upper opening of the metal case reduced in diameter by the drawing mold. The upper end of the part can be curled to the desired shape. Further, since the draft taper is formed on the inner peripheral surface of the lower end of the recess, when the curl mold is inserted into the upper opening of the metal case, the curl die and the lower peripheral edge of the upper opening of the metal case are The contact surface with the lower end of the recess can be reduced. Therefore, it is possible to easily remove the curl mold from the metal case after the curling step is completed. As a result, it is possible to prevent the airtightness of the battery from being lowered due to the fall of the sealing plate and the cracking of the insulating gasket.
【００１０】更に、前記絞り金型の中空部の各コーナの
アールの半径をｒ1 とし、前記カール金型の前記凹部の
各コーナのアールの半径をｒ2 とした時、ｒ1 ＞ｒ2 を
満たす絞り金型及びカール金型を用いることにより、縮
径後の前記金属ケースの前記上部開口部のコーナに前記
絞り金型と同寸法のアールをつけることができるため、
前記カール金型を前記金属ケースの前記上部開口部に挿
入しカールを行った際に前記金属ケースの前記上部開口
部のコーナーに作用する力を低減することができる。そ
の結果、メッキはがれや傷を防止できると共に及びナッ
クアウト時の抜き出しを容易にすることができるため、
気密性及び信頼性を高めることができる。Further, when the radius of the radius of each corner of the hollow portion of the drawing die is r 1 and the radius of the radius of each corner of the recess of the curl die is r 2 , r 1 > r 2 By using a diaphragm mold and a curl mold that satisfy the conditions, it is possible to add a radius of the same size as the diaphragm mold to the corner of the upper opening of the metal case after the diameter reduction,
A force acting on a corner of the upper opening of the metal case when the curl mold is inserted into the upper opening of the metal case and curled can be reduced. As a result, plating peeling and scratches can be prevented and extraction at the time of knockout can be facilitated,
Airtightness and reliability can be improved.
【００１１】[0011]
【実施例】以下、本発明の実施例を図面を参照して説明
する。 実施例１ まず、本発明の製造方法において用いられる絞り金型及
びカール金型について図１〜図１１を参照して説明す
る。Embodiments of the present invention will be described below with reference to the drawings. Example 1 First, a drawing die and a curling die used in the manufacturing method of the present invention will be described with reference to FIGS. 1 to 11.
【００１２】図１及び図２において、下型１はその上に
後述する金属ケース２が載置される。角筒形の中空部３
が中央部に設けられ、かつ前記中空部３の下端内周面４
が外側５°に拡口して形成された絞りテーパ部４を有す
る上下動自在な第１絞り金型５は前記下型１の上方に配
置されている。下部周縁に矩形枠状突起部６が形成され
たナックアウト７は、前記中空部３を上下動する。ま
た、図１０では前記ナックアウト７を図示せず、前記中
空部３の各コーナのアールの半径（ｒ1 ）は０．８１ｍ
ｍである。In FIGS. 1 and 2, the lower mold 1 has a metal case 2 to be described later placed thereon. Square tubular hollow part 3
Is provided in the central portion, and the lower end inner peripheral surface 4 of the hollow portion 3 is
A vertically movable first diaphragm die 5 having a diaphragm taper portion 4 formed by expanding to 5 ° outside is arranged above the lower die 1. A knuckout 7 having a rectangular frame-shaped projection 6 formed on the lower peripheral edge moves up and down in the hollow portion 3. Further, in FIG. 10, the knuckout 7 is not shown, and the radius (r 1 ) of the radius of each corner of the hollow portion 3 is 0.81 m.
m.
【００１３】図３及び図４において、角筒形の中空部８
が中央部に設けられ、かつ底部に前記中空部８と連通す
ると共に前記中空部より寸法の大きい角形凹部９が形成
された第１カール金型１０は前記下型１の上方に配置さ
れている。下部周縁に矩形枠状突起部１１が形成された
ナックアウト１２は、前記中空部８及び前記凹部９を上
下動する。図１２に示すように前記凹部９の下端内周面
に２°の抜きテーパ１３が形成されている。また、図１
１に示すように前記凹部９の各コーナのアールの半径
（ｒ2 ）は０．７９ｍｍである。In FIGS. 3 and 4, the hollow portion 8 having a rectangular tubular shape.
Is provided in the central part, and the first curl mold 10 is provided above the lower mold 1 and has a square recess 9 having a size larger than the hollow part and communicating with the hollow part 8 in the bottom part. . A knuckout 12 having a rectangular frame-shaped projection 11 formed on the lower peripheral edge moves up and down in the hollow portion 8 and the recess 9. As shown in FIG. 12, a 2 ° taper 13 is formed on the inner peripheral surface of the lower end of the recess 9. Also, FIG.
As shown in FIG. 1, the radius (r 2 ) of the radius of each corner of the recess 9 is 0.79 mm.
【００１４】図５及び図６において、角筒形の中空部１
４が中央部に設けられ、かつ前記中空部１４の下端内周
面１５が外側に４°拡口して形成された絞りテーパ部１
５を有する上下動自在な第１絞り金型１６は前記下型１
の上方に配置されている。下部周縁に矩形枠状突起部１
７が形成されたナックアウト１８は、前記中空部１４を
上下動する。また、前記中空部１４の各コーナのアール
の半径（ｒ3 ）は０．８１ｍｍである。In FIGS. 5 and 6, the hollow portion 1 having a rectangular tubular shape is shown.
4 is provided in the central portion, and the tapered inner peripheral surface 15 of the hollow portion 14 is formed by expanding the inner peripheral surface 15 by 4 ° to the outside.
A first diaphragm die 16 having a movable upper and lower 5 is the lower die 1
Is located above. Rectangular frame-shaped protrusion 1 on the lower edge
The knuckout 18 formed with 7 moves up and down in the hollow portion 14. The radius (r 3 ) of the radius of each corner of the hollow portion 14 is 0.81 mm.
【００１５】図７及び図８において、角筒形の中空部１
９が中央部に設けられ、かつ底部に前記中空部１９と連
通すると共に前記中空部１９より寸法の大きい角形凹部
２０が形成された第２カール金型２１は前記下型１の上
方に配置されている。下部周縁に矩形枠状突起部２２が
形成されたナックアウト２３は、前記中空部１９及び前
記凹部２０を上下動する。前記凹部２０の下端内周面に
２°の抜きテーパ２４が形成されている。また、前記凹
部２０の各コーナのアールの半径（ｒ4 ）は０．７９ｍ
ｍである。次に、本発明の製造方法を詳細に説明する。In FIGS. 7 and 8, the hollow portion 1 having a rectangular tubular shape is shown.
The second curl mold 21 is provided above the lower mold 1 and is provided at the center with a rectangular recess 20 communicating with the hollow 19 at the bottom and having a size larger than the hollow 19. ing. A knuckout 23 having a rectangular frame-shaped protrusion 22 formed on the lower peripheral edge moves up and down in the hollow portion 19 and the recess 20. A 2 ° draft taper 24 is formed on the inner peripheral surface of the lower end of the recess 20. In addition, the radius (r 4 ) of each corner of the recess 20 is 0.79 m.
m. Next, the manufacturing method of the present invention will be described in detail.
【００１６】前述した図１に示すように例えば胴部の長
い側の幅（Ｌ1 ）が１３．８ｍｍ（短い側の幅が６．８
ｍｍ）、肉厚が０．４ｍｍである有底角筒形の前記金属
ケース２の前記上部開口部を拡口させることにより段部
２５を形成すると共に、前記段部２５の上方側に長い側
の幅（Ｌ2 ）が１４．２ｍｍ（短い側の幅が７．２ｍ
ｍ）の立ち上がり部２６を形成した。つづいて、袋形状
のセパレータ２７に覆われた水酸化ニッケルを活物質と
して含む正極板２８と、水素吸蔵合金を活物質として含
む負極板２９とを積層した電極体３０を前記金属ケース
２内に収納した。ひきつづき、前記金属ケース２内にア
ルカリ電解液を収容した。さらに、底部に矩形の穴３１
が開口された有底角筒形の絶縁ガスケット３２に防爆機
能及び端子を兼ねる封口蓋群３３を載置し、前記絶縁ガ
スケット３２を前記金属ケース２の前記立ち上がり部２
６下の前記段部２５に載置した。前記封口蓋群３３は、
中央にガス抜き孔３４が開口された金属製の封口板３５
と、前記ガス抜き孔３４を覆うように載置され、例えば
合成ゴムからなる安全弁３６と、前記封口板３５と溶接
されることにより前記安全弁３６を包囲し、ガス抜き孔
３７が開口された金属製の帽子形端子板３８とから構成
されている。なお、一端が前記正極板２８と接続された
正極リード３９は、他端が前記封口板３５の下面と接続
されている。その後、前記金属ケース２を前記下型１に
載置し、前記第１絞り金型５を前記金属ケース２の上方
に配置した。As shown in FIG. 1 described above, for example, the width (L 1 ) on the long side of the body is 13.8 mm (the width on the short side is 6.8).
mm), the step portion 25 is formed by expanding the upper opening of the bottomed rectangular metal case 2 having a wall thickness of 0.4 mm, and a long side above the step portion 25. Width (L 2 ) of 14.2 mm (width on the short side is 7.2 m
The rising part 26 of m) was formed. Subsequently, an electrode body 30 in which a positive electrode plate 28 containing nickel hydroxide as an active material and covered with a bag-shaped separator 27 and a negative electrode plate 29 containing a hydrogen storage alloy as an active material were laminated was provided in the metal case 2. Stowed. Subsequently, the alkaline electrolyte was stored in the metal case 2. In addition, a rectangular hole 31 on the bottom
A sealing lid group 33 having an explosion-proof function and a terminal is placed on a bottomed rectangular tubular insulating gasket 32 having an opening, and the insulating gasket 32 is attached to the rising portion 2 of the metal case 2.
6 was placed on the step 25 below. The sealing lid group 33 is
A metal sealing plate 35 having a gas vent hole 34 in the center
A metal that is placed so as to cover the gas vent hole 34, and is surrounded by the safety valve 36 by being welded to the safety valve 36 made of, for example, synthetic rubber and the sealing plate 35, and the gas vent hole 37 is opened. And a cap-shaped terminal plate 38 made of steel. The positive electrode lead 39 having one end connected to the positive electrode plate 28 has the other end connected to the lower surface of the sealing plate 35. Then, the metal case 2 was placed on the lower die 1, and the first drawing die 5 was placed above the metal case 2.
【００１７】次いで、前述した図２に示すように前記第
１絞り金型５を下降させ前記ナックアウト７の前記突起
部６で前記金属ケース２の上部開口部の上端を押さえな
がら前記第１絞り金型５を前記金属ケース２の上部開口
部に挿入することにより、前記金属ケース２の上部開口
部を前記絶縁ガスケット３２の幅（Ｌ3 ）まで縮径して
前記絶縁ガスケット３２をやや圧縮し、かつ前記上部開
口部の前記段部２５を内方へ移動させた。つづいて、前
記第１絞り金型５を上昇させながら前記ナックアウト７
の前記突起部６で前記金属ケース２の前記上部開口部上
端を押し出して前記金属ケース２から取り外した後、前
述した図３に示すように前記凹部９の内周面に潤滑剤が
塗布された前記第１カール金型１０を前記金属ケース２
上方に配置した。Then, as shown in FIG. 2 described above, the first diaphragm die 5 is lowered to hold down the upper end of the upper opening of the metal case 2 with the protrusion 6 of the knuckout 7, and the first diaphragm. By inserting the mold 5 into the upper opening of the metal case 2, the diameter of the upper opening of the metal case 2 is reduced to the width (L 3 ) of the insulating gasket 32 to slightly compress the insulating gasket 32. The step 25 of the upper opening was moved inward. Subsequently, while raising the first drawing die 5, the knockout 7
After the upper end of the upper opening of the metal case 2 is pushed out by the protrusion 6 and removed from the metal case 2, a lubricant is applied to the inner peripheral surface of the recess 9 as shown in FIG. The first curl mold 10 is attached to the metal case 2
It was placed above.
【００１８】次いで、前述した図４に示すように前記第
１カール金型１０を下降させて前記ナックアウト１２の
前記突起部１１で前記封口板３５を当接しながら前記第
１カール金型１０の前記凹部９の内周面と前記金属ケー
ス２の上部開口部の上端を当接させることにより、前記
金属ケース２の上部開口部の上端と前記絶縁ガスケット
３２の立上がり部を内方に折り曲げた。つづいて、前述
した図５に示すように前記第１カール金型１０を上昇さ
せながら前記ナックアウト１２の前記突起部１１で前記
封口板３５上面を押すことにより前記第１カール金型１
０を前記金属ケース２から取り外した後、前記第２絞り
金型１６を前記金属ケース２の上方に配置した。Next, as shown in FIG. 4 described above, the first curl mold 10 is lowered while the protrusion 11 of the knuckout 12 is in contact with the sealing plate 35. By bringing the inner peripheral surface of the recess 9 into contact with the upper end of the upper opening of the metal case 2, the upper end of the upper opening of the metal case 2 and the rising portion of the insulating gasket 32 were bent inward. Subsequently, as shown in FIG. 5, the first curl mold 1 is pushed by pushing the upper surface of the sealing plate 35 with the protrusion 11 of the knuckout 12 while raising the first curl mold 10.
After removing 0 from the metal case 2, the second drawing die 16 was placed above the metal case 2.
【００１９】次いで、前述した図６に示すように前記第
１絞り金型１６を下降させ前記ナックアウト１８の前記
突起部１７で前記金属ケース２の上部開口部の上端を押
さえながら前記第１絞り金型１６を前記金属ケース２の
上部開口部に挿入することにより、前記金属ケース２の
上部開口部を前記金属ケース２胴部の幅（Ｌ1 ）とほぼ
等しくなるまで縮径し、前記金属ケース２の前記段部２
５を内方に移動させて幅がＬ4 の屈曲部４１を形成し
た。つづいて、前述した図７に示すように前記第２絞り
金型１６を上昇させながら前記ナックアウト１８の前記
突起部１７で金属ケース２の前記上部開口部上端を押し
出して前記第２絞り型１６を前記金属ケース２から取り
外した後、前記第２カール金型２１を前記金属ケース２
上方に配置した。Next, as shown in FIG. 6 described above, the first diaphragm die 16 is lowered to hold the upper end of the upper opening of the metal case 2 with the protrusion 17 of the knuckout 18, and the first diaphragm. By inserting the mold 16 into the upper opening of the metal case 2, the upper opening of the metal case 2 is reduced in diameter until it becomes substantially equal to the width (L 1 ) of the body of the metal case 2, Case 2 of Case 2
5 was moved inward to form a bent portion 41 having a width L 4 . Subsequently, as shown in FIG. 7, while the second drawing die 16 is being raised, the upper end of the upper opening of the metal case 2 is pushed out by the protrusion 17 of the knuckout 18 and the second drawing die 16 is pushed. After removing the second curl mold 21 from the metal case 2.
It was placed above.
【００２０】次いで、前述した図８に示すように前記第
１カール金型２１を下降させて前記第１カール金型２１
の前記凹部２０の内周面と前記金属ケース２の上部開口
部の上端を当接させることにより、前記金属ケース２の
上部開口部の上端をカールし前記絶縁ガスケット３２の
前記立ち上がり部を圧縮した。この後、前記第２カール
金型２１を上昇させると共に前記ナックアウト２３の前
記突起部２２で前記封口板３５を押し出して図９に示す
ように前記金属ケース２から前記第２カール金型及び前
記下型１を取り外し、封口工程を完了した。Next, as shown in FIG. 8 described above, the first curl mold 21 is lowered to move the first curl mold 21.
By bringing the inner peripheral surface of the recess 20 into contact with the upper end of the upper opening of the metal case 2, the upper end of the upper opening of the metal case 2 is curled and the rising portion of the insulating gasket 32 is compressed. . Then, the second curl mold 21 is raised, and the sealing plate 35 is pushed out by the projection 22 of the knuckout 23 to push the second curl mold and the second curl mold from the metal case 2 as shown in FIG. The lower mold 1 was removed, and the sealing process was completed.
【００２１】なお、前述した図９に示すような電池にお
いて、過充電や短絡等に起因して前記金属ケース２内に
ガスが発生し前記ガス圧力が前記封口板３５の前記ガス
抜き孔３４を通して前記安全弁３６に加わると、前記安
全弁３６は弾性材料からなるために持ち上げられ前記封
口板３５との間に隙間が生じる。その結果、前記ガスが
前記隙間及び前記帽子型端子板３８の前記ガス抜き孔３
７から外部へ逃散し前記電池の破裂を防止することがで
きる。In the battery as shown in FIG. 9 described above, gas is generated in the metal case 2 due to overcharge, short circuit, etc., and the gas pressure is passed through the gas vent hole 34 of the sealing plate 35. When added to the safety valve 36, the safety valve 36 is lifted because it is made of an elastic material, and a gap is created between the safety valve 36 and the sealing plate 35. As a result, the gas is discharged into the gap and the gas vent hole 3 of the cap-type terminal plate 38.
It is possible to prevent the battery from bursting by escaping from the outside to the outside.
【００２２】このような製造方法において前述した図４
及び図１１に示すように角筒形の中空部８が中央部に設
けられ、かつ底部に前記中空部８と連通すると共に前記
中空部８より寸法の大きい角形凹部９が形成された第１
カール金型１０の前記凹部９の下端内周面に抜きテーパ
１３を形成することによって、予め縮径された金属ケー
ス２の上部開口部の上端を所期形状に折り曲げることが
できる。また、前記金属ケース２の前記上部開口部の周
縁と前記凹部９の下端との接触面を低減することができ
るため、前記第１カール金型１０を上昇させて前記金属
ケース２から取り外す際に前記金属ケース２の前記上部
開口部の周縁と前記凹部９の内周面とに生じる摩擦を低
減することができる。その結果、前記金属ケース２から
前記第１カール金型１０を極めて容易に取り外すことが
できる。従って、気密性の低い恐れのない電池を製造す
ることができる。なお、第２カール金型２１も前記第１
カール金型１０と同様な効果を有する。The above-described manufacturing method shown in FIG.
And, as shown in FIG. 11, a rectangular tubular hollow portion 8 is provided in the central portion, and a rectangular concave portion 9 having a size larger than that of the hollow portion 8 is formed in the bottom portion so as to communicate with the hollow portion 8.
By forming the draft taper 13 on the inner peripheral surface of the lower end of the concave portion 9 of the curl mold 10, the upper end of the upper opening of the metal case 2 having a reduced diameter in advance can be bent into a desired shape. Further, since the contact surface between the peripheral edge of the upper opening of the metal case 2 and the lower end of the recess 9 can be reduced, when the first curl mold 10 is lifted and removed from the metal case 2. Friction generated between the peripheral edge of the upper opening of the metal case 2 and the inner peripheral surface of the recess 9 can be reduced. As a result, the first curl mold 10 can be removed from the metal case 2 very easily. Therefore, it is possible to manufacture a battery with low risk of airtightness. The second curl die 21 is also the first
It has the same effect as the curl die 10.
【００２３】更に、前述した図１０に示すように第１絞
り金型５の中空部３の各コーナのアールの半径をｒ
1 （０．８１ｍｍ）とし、前記第１カール金型１０の前
記凹部９の各コーナのアールの半径をｒ2 （０．７９ｍ
ｍ）とした時、ｒ1 ＞ｒ2 を満たす第１絞り金型５及び
第１カール金型１０を用いることにより、前記金属ケー
ス２の前記上部開口部のコーナに前記第１カール金型の
前記凹部９のコーナのアールよりやや大きいアールをつ
けながら縮径することができるため、次工程のカール工
程で前記金属ケース２の前記上部開口部のコーナにはほ
とんど触れることなくカーリングすることができる。そ
の結果、前記金属ケース２の前記上部開口部のコーナに
おける抵抗を小さくしてカーリングすることができるた
め、カール時に前記金属ケース２が変形するのを防止す
ることができる。また、前記コーナと前記第１カール金
型１０との食い付きがなくなることから、前記ナックア
ウト１２で前記封口板３５を過度に押圧せずに前記第１
カール金型を前記金属ケース２から取り外すことができ
る。その結果、前記封口板３５の反り及び前記絶縁ガス
ケット３２の割れに起因する気密性の低下を防ぐことが
できる。なお、第２絞り金型１６及び第２カール金型２
１も前記第１絞り金型５及び前記第１カール金型１０と
同様な効果を有する。事実、以下に説明する実験によっ
て実施例１で製造された電池が優れた特性を有すること
が確認された。Further, as shown in FIG. 10, the radius of the radius of each corner of the hollow portion 3 of the first drawing die 5 is r.
1 (0.81 mm) and the radius of the radius of each corner of the concave portion 9 of the first curl mold 10 is r 2 (0.79 m
m), the first curl die 5 and the first curl die 10 satisfying r 1 > r 2 are used, so that the corner of the upper opening of the metal case 2 can be formed by the first curl die. Since the diameter can be reduced while the radius of the corner of the recess 9 is slightly larger than that of the corner of the recess 9, curling can be performed in the curling step of the next step while barely touching the corner of the upper opening of the metal case 2. . As a result, curling can be performed by reducing the resistance at the corner of the upper opening of the metal case 2, and thus the metal case 2 can be prevented from being deformed during curling. Further, since there is no biting between the corner and the first curl mold 10, the first knock-out plate 12 does not excessively press the sealing plate 35 and the first curl mold 10 does not excessively press the first curl mold 10.
The curl mold can be removed from the metal case 2. As a result, it is possible to prevent the deterioration of the airtightness due to the warp of the sealing plate 35 and the crack of the insulating gasket 32. The second drawing die 16 and the second curling die 2
1 also has the same effect as the first drawing die 5 and the first curling die 10. In fact, the experiments described below confirmed that the battery manufactured in Example 1 had excellent characteristics.
【００２４】まず、比較例１の電池として、カール金型
の凹部の下端内周面に抜きテーパを形成しなかったこと
以外、実施例１と同様な製造方法により製造された電池
を用意した。ただし、カール工程後、前記カール金型を
上昇させると共に前記ナックアウトで前記封口板を下方
に強く押圧することにより前記カール金型を前記金属ケ
ースから取り外したために、前記封口板の反り及び前記
絶縁ガスケットの下落が認められた。First, as the battery of Comparative Example 1, a battery manufactured by the same manufacturing method as that of Example 1 was prepared, except that the tapered inner surface of the lower end of the concave portion of the curl mold was not formed. However, after the curling step, since the curl mold is removed from the metal case by raising the curl mold and strongly pressing the sealing plate downward with the knuckout, the warpage of the sealing plate and the insulation Falling of the gasket was observed.
【００２５】実施例１及び比較例１それぞれについて、
カール工程終了後前記カール金型を前記金属ケースから
取り外す際に前記ナックアウトで前記封口板を押圧する
力を測定したところ、実施例１では３５ｋｇであるのに
対し、比較例１では７０ｋｇであった。なお、カール金
型及び絞り金型の金属ケース表面と接する面には、摩擦
力を低減する潤滑剤があるとなお一層好ましい。For each of Example 1 and Comparative Example 1,
After the curling step, when the curl mold was detached from the metal case, the force of pressing the sealing plate with the knuckout was measured and found to be 35 kg in Example 1 and 70 kg in Comparative Example 1. It was It is even more preferable that a lubricant that reduces frictional force is provided on the surfaces of the curl mold and the drawing mold that come into contact with the metal case surface.
【００２６】[0026]
【発明の効果】以上詳述したように本発明によれば、縮
径後の金属ケースの上部開口部の上端を所期形状に折り
曲げることができると共にカール金型を金属ケースから
容易に取り外すことができ、封口板の反りなどに起因す
る信頼性の低下を防ぐことが可能な角形密閉電池の製造
方法を提供することができる。As described above in detail, according to the present invention, the upper end of the upper opening of the metal case after the diameter reduction can be bent into a desired shape and the curl mold can be easily removed from the metal case. Therefore, it is possible to provide a method for manufacturing a prismatic sealed battery capable of preventing the reliability from being lowered due to the warping of the sealing plate.
【図１】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 1 is a cross-sectional view showing a manufacturing process of a rectangular sealed battery of the present invention.
【図２】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 2 is a cross-sectional view showing a manufacturing process of a square sealed battery of the present invention.
【図３】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 3 is a cross-sectional view showing a manufacturing process of the prismatic sealed battery of the present invention.
【図４】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 4 is a cross-sectional view showing the manufacturing process of the prismatic sealed battery of the present invention.
【図５】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 5 is a cross-sectional view showing the manufacturing process of the prismatic sealed battery of the present invention.
【図６】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 6 is a cross-sectional view showing a manufacturing process of the prismatic sealed battery of the present invention.
【図７】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 7 is a cross-sectional view showing the manufacturing process of the prismatic sealed battery of the present invention.
【図８】本発明の角型密閉電池の製造工程を示す断面
図。FIG. 8 is a cross-sectional view showing the manufacturing process of the rectangular sealed battery of the present invention.
【図９】本発明の製造方法により製造された角型密閉電
池を示す断面図。FIG. 9 is a cross-sectional view showing a rectangular sealed battery manufactured by the manufacturing method of the present invention.
【図１０】図１の絞り金型のＡ−Ａ線に沿う断面図。10 is a cross-sectional view taken along the line AA of the drawing die in FIG.
【図１１】図３のカール金型のＢ−Ｂ線に沿う断面図。11 is a cross-sectional view of the curl die of FIG. 3 taken along the line BB.
【図１２】図３のＡ部の拡大図。FIG. 12 is an enlarged view of part A in FIG.
２…金属ケース、３…中空部、４…絞りテーパ、５…第
１絞り金型、７…ナックアウト、８…中空部、９…凹
部、１０…第１カール金型、１２…ナックアウト、１３
…抜きテーパ、１４…中空部、１５…絞りテーパ、１６
…第２絞り金型、１８…ナックアウト、１９…中空部、
２０…凹部、２１…第２カール金型、２３…ナックアウ
ト、２４…抜きテーパ、２５…段部、３１…矩形の穴、
３２…絶縁ガスケット、３５…封口板、３９…絶縁ガス
ケットの立上り部。2 ... Metal case, 3 ... Hollow part, 4 ... Drawing taper, 5 ... 1st drawing die, 7 ... Knuckout, 8 ... Hollow part, 9 ... Recessed part, 10 ... First curl die, 12 ... Nuckout, Thirteen
... Drawing taper, 14 ... Hollow part, 15 ... Drawing taper, 16
... second drawing die, 18 ... knuckout, 19 ... hollow part,
20 ... Recessed portion, 21 ... Second curl mold, 23 ... Knuckout, 24 ... Drain taper, 25 ... Stepped portion, 31 ... Rectangular hole,
32 ... Insulating gasket, 35 ... Sealing plate, 39 ... Rising part of insulating gasket.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 北爪 秀明 東京都品川区南品川３丁目４番10号 東芝 電池株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideaki Kitazume 3-4-10 Minamishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Battery Co., Ltd.
Claims (2)
れた段部を有する有底角筒形の金属ケース内に発電要素
を収納する工程と、予め金属製封口板が収納された底部
に矩形の穴を有する有底角筒形の絶縁ガスケットを前記
金属ケースの前記段部上に載置する工程と、角筒形の中
空部が中央部に設けられ、かつ前記中空部の下端内周面
が外側に拡口して形成された絞りテーパ部を有する絞り
金型を用い、前記絞り金型を前記金属ケースの前記上部
開口部に挿入し前記金属ケースの前記上部開口部を前記
金属ケースの胴部にほぼ等しい寸法まで縮径して前記絶
縁ガスケットの立上がり壁を内方に圧縮する工程と、角
筒形の中空部が中央部に設けられ、かつ底部に前記中空
部と連通すると共に前記中空部より寸法の大きい角形凹
部が形成されたカール金型を用い、前記カール金型を前
記金属ケースの前記上部開口部の上端に当接させて前記
金属ケースの前記上部開口部の上端を内方にカーリング
することにより前記封口板を前記絶縁ガスケットを介し
て圧縮固定した後、前記中空部を上下動するナックアウ
トで前記金属製封口板を押圧しながら前記カール金型を
上昇させることにより前記カール金型を前記金属ケース
から取り外す工程とを具備した角形密閉電池の製造方法
において、 前記カール金型の前記凹部の下端内周面に０．５°〜１
０°の抜きテーパが形成されていることを特徴とする角
形密閉電池の製造方法。1. A step of accommodating a power generating element in a metal case having a bottomed rectangular tube shape having a step formed by expanding the upper opening, and a step of accommodating a metal sealing plate in advance on the bottom. Placing a bottomed rectangular tubular insulating gasket having a rectangular hole on the stepped portion of the metal case; a hollow tubular hollow portion is provided in the center, and the lower end inner circumference of the hollow portion A diaphragm mold having a diaphragm taper portion whose surface is expanded outward is used, the diaphragm mold is inserted into the upper opening of the metal case, and the upper opening of the metal case is inserted into the metal case. And compressing the rising wall of the insulating gasket inward by reducing the diameter to a size approximately equal to the body of the hollow body, and a hollow hollow portion having a rectangular tubular shape is provided in the central portion and the bottom portion communicates with the hollow portion. A car having a rectangular recess having a size larger than that of the hollow part A metal mold, the curl mold is brought into contact with the upper end of the upper opening of the metal case, and the upper end of the upper opening of the metal case is curled inward to insulate the sealing plate. After compression and fixing via a gasket, a step of removing the curl die from the metal case by raising the curl die while pressing the metal sealing plate with a knuckout that moves up and down the hollow portion. In the method for manufacturing a prismatic sealed battery provided, 0.5 ° to 1 is formed on an inner peripheral surface of a lower end of the concave portion of the curl mold.
A method for manufacturing a prismatic sealed battery, characterized in that a 0 ° draft taper is formed.
アールの半径をｒ1とし、前記カール金型の前記凹部の
各コーナのアールの半径をｒ2 とした時、下記式 ｒ1 ＞ｒ2 を満たす絞り金型及びカール金型を用いることを特徴と
する請求項１記載の角形密閉電池の製造方法。2. When the radius of the radius of each corner of the hollow portion of the drawing die is r 1 and the radius of the radius of each corner of the recess of the curl die is r 2 , the following formula r 1 is obtained. The method for manufacturing a prismatic sealed battery according to claim 1, wherein a drawing die and a curl die satisfying> r 2 are used.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03989693A JP3253159B2 (en) | 1993-03-01 | 1993-03-01 | Manufacturing method of prismatic sealed battery |
| US08/095,429 US5372897A (en) | 1992-07-24 | 1993-07-23 | Rectangular nickel-metal hydride secondary cell |
| US08/298,662 US5490867A (en) | 1992-07-24 | 1994-08-31 | Method of making a rectangular nickel-metal hydride secondary cell |
| US08/298,670 US5537733A (en) | 1992-07-24 | 1994-08-31 | Method of manufacturing a nickel-metal hydride secondary cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03989693A JP3253159B2 (en) | 1993-03-01 | 1993-03-01 | Manufacturing method of prismatic sealed battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06260153A true JPH06260153A (en) | 1994-09-16 |
| JP3253159B2 JP3253159B2 (en) | 2002-02-04 |
Family
ID=12565731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03989693A Expired - Lifetime JP3253159B2 (en) | 1992-07-24 | 1993-03-01 | Manufacturing method of prismatic sealed battery |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3253159B2 (en) |
-
1993
- 1993-03-01 JP JP03989693A patent/JP3253159B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JP3253159B2 (en) | 2002-02-04 |
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