JP2004235020A

JP2004235020A - Method of manufacturing lead-acid battery

Info

Publication number: JP2004235020A
Application number: JP2003022227A
Authority: JP
Inventors: Masashi Iwata; 政司岩田; Masataka Omura; 雅孝大村
Original assignee: Japan Storage Battery Co Ltd
Current assignee: Japan Storage Battery Co Ltd
Priority date: 2003-01-30
Filing date: 2003-01-30
Publication date: 2004-08-19

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently melt an electrode lug group and a seat of an electrode poles , unite both to obtain a strap having a good welding state, and provide a welding method capable of confirming a welding state in a method of manufacturing a lead-acid battery forming the strap with a comb shape by a burner method, and joining the seat of electrode poles and the electrode lug group. <P>SOLUTION: Welding capability is improved by using the seat in which an inclined part descends toward the side part of the electrode lug group, the comb shape in which a recessed part is formed in a part coming in contact with the lower part of the comb-shaped seat is used, and the welding state is checked from the shape of a projecting part in the lower part of the seat after solidified produced by an inflow state to the recessed part of molten lead of the seat. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は鉛蓄電池の製造方法、特にストラップ形成に関する。
【０００２】
【従来の技術】
鉛蓄電池の発電要素は、複数の正極板、負極板およびセパレータからなり、正極板の極板耳群同士及び負極板の極板耳群同士をバーナー法等により部分的に溶融してストラップを形成し、互いに電気的に接続される。図１は、バーナー法によりストラップを形成する状態を示す要部斜視図、図２は、その側断面図で、１は極板耳群、２は完成後のストラップ、３は極柱（ポール）、４は台座、４１は極板耳群側の台座側部、５は櫛状の切込みを有する溶接補助具（通常、櫛形と称している。以降、櫛形と記載）、６は櫛状の切込み部、７はバーナー、８は足し鉛、９は堰をそれぞれ示す。
【０００３】
図１および図２に示すように、櫛形５の櫛状切込み部６に極板耳群１をその上部が櫛形５の上面よりも上に突出するように嵌合した後、櫛形５の上面に所定のストラップ形状になるように極板耳群１を囲むようにして金属ブロック等の堰９を載置して極板耳群１および台座４をバーナー７であぶって部分的に溶融し、さらに場合によってはその堰９の中に足し鉛８を溶融しながら流し込み、ストラップ２を形成すると共に台座４とストラップ２とを一体に溶接・接合する。
【０００４】
【発明が解決しようとする課題】
ところが、上記のような従来の製造方法では、図２に示すように、台座側部４１と極板耳群１との間にほとんど隙間がなく、しかも前記台座側部４１が垂直に立ち上がっているため、バーナー７の炎が前記台座側部４１に十分に当たらず、台座４と極板耳群１が十分に相互溶融されない。そのため、極板耳群１が一部溶融し、足し鉛を供給することによってストラップは形成されたが、極板耳群１と台座側部４１とが十分に溶接されていない不具合が発生する。図３は、そのような不具合状態を模式的に示した要部側断面図で、１０は極板耳群１と台座側部４１との間に形成された隙間（不完全溶接部）を示す。他の構成部材は図１と同じ番号を付記する。
【０００５】
図３に示すように、バーナー側の表面では台座４とストラップ２とは一体に溶接されているが、内部では隙間１０が存在し、台座４とストラップ２とが十分に溶接されておらず強度的に弱い。また、蓄電池の使用中に、特に正極板において、該隙間１０に電解液である希硫酸が上昇し、その部分で腐食が進行し、ストラップが破断する問題を抱えていた。
【０００６】
したがって、本発明が解決しようとする課題は、バーナー法により台座４と極板耳群１とを部分的に溶融してストラップを形成して一体に接合する際に、極板耳群１および台座４が十分に相互溶融され、良好な溶接状態が得られ、両者が完全に一体になったストラップが形成されると共に、その溶接状態が確認可能な溶接方法を提供することにある。
【０００７】
【課題を解決するための手段】
本発明の課題を解決するための手段として、請求項１によれば、櫛形を用いバーナー法によりストラップを形成して極柱の台座と極板耳群とを接合する鉛蓄電池の製造方法において、
前記台座の極板耳群側の側部が極板耳方向に向かって下降する傾斜部を有することを特徴とするものである。
【０００８】
請求項２によれば、櫛形を用いバーナー法によりストラップを形成して極柱の台座と極板耳群とを接合する鉛蓄電池の製造方法において、
櫛形の台座下部に当接する部分に凹部を設けたことを特徴とするものである。
【０００９】
【発明の実施の形態】
図２に示すように、バーナー７で台座側部４１および極板耳群１を部分的に溶融する際に、両者の間に隙間がなく、しかも台座側部４１が垂直に立ち上がっているために、バーナー７の炎が台座側部４１の下部まで行き届かず、台座４と極板耳群１の相互溶融が不完全な状態でストラップ２が形成されてしまい、図３に示すような隙間１０が形成されることが明らかになった。
【００１０】
請求項１の発明はそのことに鑑みてなされたもので、台座４の極板耳側の台座側部４１に極板耳群方向に向かって下降する傾斜部を形成することを特徴とするもので、そのことにより、バーナーの炎が台座側面にあたり易くなり、均一に溶融されると共に、溶融した鉛あるいは鉛合金は傾斜部に添って下部に流れ、絶えず新しい鉛面が露出するので台座が十分に溶融され、極板耳群と一体化されやすく良好な溶接状態が得られる。したがって、従来のように溶接後、ストラップと台座との間に隙間１０が発生するといったことがなくなる。
【００１１】
台座側部４１の傾斜部は図４（ａ）に示すようにバーナー側の上部に部分的に形成してもよいし、図４（ｂ）に示すように台座４の上部全面に形成してもよい。傾斜角度については、台座厚みやバーナーの炎の強度を勘案して適宜設定することができるが、台座の水平面に対する角度を７０度より大きくした場合、極板群と台座側部との間隔が小さくなりバーナーの炎が入り難くなる傾向にあり本発明の効果が低減する。また、傾斜角度を２５度より小さくした場合は、台座面がフラットに近づき傾斜部の効果が小さくなり、これも本発明の効果の低減になることを試験溶接により確認した。したがって、傾斜角度としては２５〜７０度の範囲が好ましいといえる。
【００１２】
台座４と極板耳群１とを相互溶融しながらストラップ２を形成する際に、本発明の傾斜部を設けた台座を用いて溶接を行うと、溶接状態の良好なストラップが形成されるが、本願発明者はさらに、この溶接状態を確認可能な方法を見出した。
【００１３】
すなわち、請求項２に記載の発明によれば、溶接時に台座側部４１が十分に溶融されておれば、溶融した鉛あるいは鉛合金の一部は、台座４の下部に設けた櫛形の凹部１２ａに流れ込み、該溶融鉛が固化した際には、台座４の下部面に凸部が形成されることになる。したがって、該凸部の有無、ないしは形状を確認することによって溶接状態を知ることができる。すなわち、前記凸部形状が櫛形に形成した凹部の形状と同じ形状をしておれば、台座４の鉛あるいは鉛合金が十分に溶融され、溶接状態が良好であると判断できる。反対に、凸部が櫛形の凹部の形状と対応せず、例えば、一部が欠けていたりすると、台座４の鉛あるいは鉛合金が十分に溶融されておらず、溶接状態が良好でないと判断できる。
【００１４】
尚、櫛形に形成する凹部の数、形状、大きさ等は必要に応じて適宜設定しうる設計事項である。
【００１５】
【実施例】
本発明を実施例により詳細に説明する。
【００１６】
図５は、本発明の実施例１を示す要部側面図で、図４（ａ）に示す台座と極板耳群とをバーナー法により一体に溶接してストラップを形成する状態を示すもので、３は極柱、４ａは台座４の側部４１に形成された極板耳群１方向に向かって下降する傾斜部をそれぞれ示す。他の構成部材は図１と同じ番号を付記する。
【００１７】
図５に示すように、台座側面４１に傾斜部４ａを設けることによってバーナー７の炎が台座表面にあたり易くなり台座側面４１が均一に溶融される。また傾斜面に沿って溶融した鉛あるいは鉛合金は下部に流れ、絶えず新しい鉛面が露出するので、台座が十分に溶融され、台座と極板耳群とが一体化されやすく良好な溶接状態の得られることが理解できる。
【００１８】
図６は、本発明の傾斜部４ａを設けた台座４と極板耳群１とを溶接する際に、櫛形５ａの上面の台座下部に当接する部分に凹部１２ａを設けた櫛形を用いて溶接する状態を示す実施例２の要部側断面図である。他の構成部材は図５と同じ番号を付記する。
【００１９】
図６に示すように、櫛形５ａに凹部１２ａを設けた場合、バーナー７で溶融された鉛あるいは鉛合金の一部は、前記凹部１２ａに流入し、最終的に固化して台座４の下部に凸部が形成される。図７は、上記方法によって形成された凸部１２ｂを示す要部側断面図である。図７に示す凸部１２ｂの形状を観察し、その形状が櫛形５ａに設けた凹部１２ａと同じ形状を有しておれば、台座が十分に溶融され、溶接状態が良好であると判断できる。反対に、その形状が完全でないと台座が十分に溶融されておらず、溶接状態がよくないと判断できる。
【００２０】
次に、本発明の効果を具体的に示すために、Ｐｂ−０．０６質量％Ｃａ−１．５質量％Ｓｎ合金からなる正・負極格子に通常の正・負極活物質をそれぞれ充填・熟成・乾燥して未化成正・負極板を作製し、正極板８枚、負極板９枚をセパレータを介して積層して、公称電圧２Ｖ、定格容量２００Ａｈ（１０ｈＲ）用の極板群を作製した。
【００２１】
該極板群の正極板耳群と図２に示す従来の極柱が一体になった台座とをバーナー法により溶接を行い形成した２００個のストラップをＡとし、同様のエレメントの正極板耳群と本発明の実施例１の傾斜部４ａを設けた台座４とをバーナー法で溶接して形成したストラップ２００個をＢとする。これらサンプルの極板耳群をストラップ下部の位置で切断し、油圧式引張試験機の一方の保持部にストラップをクランプし、もう一方の保持部に台座をクランプして両者を引っ張って台座がストラップから剥離したときの力（ＭＰａ）を記録した。その結果を表１に示す。
【００２２】
【表１】

【００２３】
表１に示すように、従来品Ａの引張強度の平均値が２６ＭＰａで、最小値に１７ＭＰａといった低い値のものが発生しているのに対して、本発明品Ｂの平均値は３０ＭＰａと大きい値を示し、台座側部４１に傾斜部４ａを設け、溶接時にバーナーの炎が台座側部４１にあたり易い形状にすることによって台座が十分に溶融され、ストラップ２と台座４が確実に溶接されていることが明らかになった。
【００２４】
次に、実施例２に示す台座の下部に当接する櫛形上面部分に凹部１２ａを設けた櫛形５ａを用いて溶接した場合の効果を明らかにするために以下の試験を行った。
【００２５】
台座には従来品と本発明の傾斜部４ａを有する台座の２種類について溶接を実施し、各サンプルはそれぞれ２００個作製した。従来の台座を用いたものをＡＡ、本発明の台座を用いたものＢＢとし、これらサンプルを溶接・固化後、凹部１２ａによって台座の下部に形成された凸部１２ｂの形状を観察し、該凸部の形状が不完全な台座の個数を求めた。その結果を表２に示す。
【００２６】
【表２】

【００２７】
表２に示すように、凸部１２ｂの形状を観察した結果、従来の台座を用いたものは、不完全な凸部形状が１１個発生し、台座と極板耳群との溶接が十分でないものが多く発生していることが推察される。一方、台座側部に傾斜部４ａを設けたものも１個と僅かではあるが形状の不完全なものが発生した。ＡＡの形状不完全品１１個とＢＢの不完全品１個とを表１の場合と同じ条件で引張試験に供した。その結果を表３に示す。
【００２８】
【表３】

【００２９】
表３に示すように、凸部形状が不完全なものはいずれも引張強度が低く、溶接状態が良好でないことが明らかになり、凸部の観察が、溶接状態を判断する手段として適切であることが明らかになった。
【００３０】
本発明の台座側部に傾斜部を設けたものも、極僅かではあるが形状の不完全なものが発見されているので、本発明１と本発明２とを組み合わせることによって溶接状態の完全なものが得られることが分かった。
【００３１】
【発明の効果】
極柱が一体になった台座と極板耳群とをバーナーにより部分的に相互溶融してストラップを形成する際に、その構造上、台座にバーナーの炎が当たり難く、台座が十分に溶融されないままストラップが形成され、ストラップと台座の間に往々にして隙間ができ、ストラップ部の機械的強度が低くなると共に、その隙間を起点に腐食が進行し、蓄電池が短寿命になる問題を抱えていた。それに対して、本発明によれば、台座側部に極板耳群方向に向かって下降する傾斜部を設けた台座を用いることによって、バーナーの炎が台座側部全体にあたり易く均一に溶融されると共に、傾斜がついているので溶融した鉛あるいは鉛合金は下部に流れ、絶えず新しい鉛面が露出するので台座が十分に溶融され、台座と極板耳群とが一体化され易く良好な溶接状態が得られる。
【００３２】
さらに、確実な溶接状態を得るために、台座下部に当接する櫛形上面部分に凹部を設けた櫛形を用い、台座が溶融した際に、溶融鉛の一部が該凹部に流入する方式を採用し、ストラップの固化後、台座下部に形成される凸部の形状を観察することによって溶接状態を知ることができ、バーナー法による溶接精度が大幅に改善されその工業的効果が極めて大である。
【００３３】
【図面の簡単な説明】
【図１】バーナー法によりストラップを形成する状態を示す要部斜視図。
【図２】バーナー法によりストラップを形成する状態を示す要部側断面図。
【図３】バーナー法により溶接した際のストラップ部の不具合状態を示す要部側面図。
【図４】本発明の実施例１の台座を示す要部側面図（ａ）および（ｂ）。
【図５】実施例１によるストラップを形成する状態を示す要部側断面図。
【図６】請求項２に基づく実施例２のストラップを形成する状態を示す要部側断面図。
【図７】実施例２により得られたストラップおよび台座の形状を示す要部側断面図。
【符号の説明】
１極板耳群
２ストラップ
３極柱（ポール）
４台座
４１台座側部
４ａ台座側部に設けた傾斜部
５櫛形
５ａ上面に凹部を設けた櫛形
７バーナー
１２ａ櫛形に設けた凹部
１２ｂ台座下面に形成された凸部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for manufacturing a lead storage battery, and more particularly to a strap formation.
[0002]
[Prior art]
The power-generating element of a lead-acid battery is composed of a plurality of positive plates, negative plates and separators, and the straps are formed by partially melting the positive plate lugs and the negative plate lugs by a burner method or the like. And are electrically connected to each other. FIG. 1 is a perspective view of a main part showing a state in which a strap is formed by a burner method, and FIG. 2 is a side sectional view thereof. 1 is an electrode plate group, 2 is a completed strap, and 3 is a pole. Reference numeral 4 denotes a pedestal, 41 denotes a side of the pedestal on the side of the electrode plate group, 5 denotes a welding aid having a comb-like cut (generally referred to as a comb, hereinafter referred to as a comb), and 6 denotes a comb-like cut. Reference numeral 7 denotes a burner, 8 denotes an additional lead, and 9 denotes a weir.
[0003]
As shown in FIG. 1 and FIG. 2, after the electrode plate group 1 is fitted to the comb-shaped cut portion 6 of the comb shape 5 so that the upper part thereof protrudes above the upper surface of the comb shape 5, A weir 9 such as a metal block is placed so as to surround the electrode plate group 1 so as to have a predetermined strap shape, and the electrode plate group 1 and the pedestal 4 are partially melted by a burner 7 and further melted. Is added to the weir 9 while the lead 8 is melted and poured to form the strap 2, and the base 4 and the strap 2 are integrally welded and joined.
[0004]
[Problems to be solved by the invention]
However, in the conventional manufacturing method as described above, as shown in FIG. 2, there is almost no gap between the pedestal side portion 41 and the electrode plate ear group 1, and the pedestal side portion 41 stands upright. Therefore, the flame of the burner 7 does not sufficiently hit the pedestal side portion 41, and the pedestal 4 and the electrode plate ear group 1 are not sufficiently fused to each other. For this reason, although the electrode plate ear group 1 is partially melted and the strap is formed by supplying additional lead, a problem occurs in that the electrode plate ear group 1 and the pedestal side 41 are not sufficiently welded. FIG. 3 is a sectional side view of a main part schematically showing such a defective state. Reference numeral 10 denotes a gap (incompletely welded portion) formed between the electrode lug group 1 and the pedestal side 41. . Other components are denoted by the same reference numerals as in FIG.
[0005]
As shown in FIG. 3, the pedestal 4 and the strap 2 are integrally welded on the surface on the burner side, but there is a gap 10 inside, and the pedestal 4 and the strap 2 are not sufficiently welded to each other, and the strength is low. Weak. Further, during use of the storage battery, particularly in the positive electrode plate, there is a problem that the diluted sulfuric acid as the electrolytic solution rises in the gap 10 and corrosion progresses in that portion, and the strap is broken.
[0006]
Therefore, the problem to be solved by the present invention is that when the pedestal 4 and the electrode plate group 1 are partially melted by the burner method to form a strap and joined together, the electrode plate group 1 and the pedestal The present invention is to provide a welding method that can sufficiently confirm the welding condition while forming a strap in which both are sufficiently fused and a good welding condition is obtained and the two are completely integrated.
[0007]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a method for manufacturing a lead storage battery, comprising: forming a strap by a burner method using a comb, and joining a pedestal of a pole to a group of pole plates;
A side portion of the pedestal on the side of the electrode plate ears has an inclined portion descending toward the electrode plate ears.
[0008]
According to claim 2, in a method of manufacturing a lead storage battery in which a strap is formed by a burner method using a comb shape to join a pedestal of a pole and a group of pole plates,
A concave portion is provided in a portion abutting on a lower portion of the comb-shaped pedestal.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
As shown in FIG. 2, when the burner 7 partially melts the pedestal side portion 41 and the electrode plate ear group 1, there is no gap between the two and the pedestal side portion 41 rises vertically. 3, the flame of the burner 7 does not reach the lower portion of the pedestal side portion 41, and the strap 2 is formed in a state in which the pedestal 4 and the electrode plate group 1 are incompletely melted, and the gap 10 shown in FIG. Was formed.
[0010]
The invention of claim 1 has been made in view of the above, and is characterized in that an inclined portion descending in the direction of the electrode plate ear group is formed on the pedestal side portion 41 of the pedestal 4 on the electrode plate ear side. As a result, the flame of the burner easily hits the side of the pedestal, melts uniformly, and the molten lead or lead alloy flows down along the sloped part, and a new lead surface is constantly exposed, so the pedestal is sufficient. And it is easy to be integrated with the electrode lug group, and a good welding state is obtained. Therefore, the gap 10 does not occur between the strap and the pedestal after welding as in the related art.
[0011]
The inclined portion of the pedestal side portion 41 may be formed partially on the upper side of the burner as shown in FIG. 4A, or may be formed on the entire upper surface of the pedestal 4 as shown in FIG. Is also good. The inclination angle can be appropriately set in consideration of the pedestal thickness and the intensity of the flame of the burner, but when the angle of the pedestal to the horizontal plane is larger than 70 degrees, the interval between the electrode group and the pedestal side is small. Therefore, the flame of the burner tends to be hard to enter, and the effect of the present invention is reduced. In addition, it was confirmed by test welding that when the inclination angle was smaller than 25 degrees, the pedestal surface approached flat, and the effect of the inclined portion was reduced, which also reduced the effect of the present invention. Therefore, it can be said that the inclination angle is preferably in the range of 25 to 70 degrees.
[0012]
When forming the strap 2 while mutually melting the pedestal 4 and the electrode lug group 1, if welding is performed using the pedestal provided with the inclined portion of the present invention, a strap in a good welding state is formed. Further, the inventor of the present application has found a method capable of confirming the welding state.
[0013]
That is, according to the second aspect of the present invention, if the pedestal side portion 41 is sufficiently melted at the time of welding, a part of the molten lead or lead alloy becomes a comb-shaped concave portion 12a provided at the lower portion of the pedestal 4. When the molten lead is solidified, a projection is formed on the lower surface of the pedestal 4. Therefore, the welding state can be known by checking the presence or absence or the shape of the projection. That is, if the convex portion has the same shape as the comb-shaped concave portion, it can be determined that the lead or lead alloy of the pedestal 4 is sufficiently melted and the welding state is good. Conversely, if the convex portion does not correspond to the shape of the comb-shaped concave portion and, for example, is partially missing, the lead or lead alloy of the pedestal 4 is not sufficiently melted, and it can be determined that the welding state is not good. .
[0014]
The number, shape, size, and the like of the comb-shaped recesses are design items that can be appropriately set as needed.
[0015]
【Example】
The present invention will be described in detail with reference to examples.
[0016]
FIG. 5 is a side view showing a main part of the first embodiment of the present invention, in which a pedestal shown in FIG. 4A and an electrode plate group are integrally welded by a burner method to form a strap. Reference numeral 3 denotes an pole, and reference numeral 4a denotes an inclined portion formed on the side portion 41 of the pedestal 4 and descending toward the electrode plate ear group 1. Other components are denoted by the same reference numerals as in FIG.
[0017]
As shown in FIG. 5, by providing the inclined portion 4 a on the pedestal side surface 41, the flame of the burner 7 easily hits the pedestal surface, and the pedestal side surface 41 is uniformly melted. In addition, the molten lead or lead alloy along the inclined surface flows to the lower part, and a new lead surface is constantly exposed, so that the pedestal is sufficiently melted and the pedestal and the electrode plate group are easily integrated, and a good welding state is obtained. It can be understood that it can be obtained.
[0018]
FIG. 6 shows a case where the pedestal 4 provided with the inclined portion 4a of the present invention and the electrode plate group 1 are welded using a comb having a concave portion 12a in a portion of the upper surface of the comb 5a which is in contact with the lower portion of the pedestal. FIG. 10 is a side sectional view of a main part of a second embodiment, showing a state in which it is performed. The other components are denoted by the same reference numerals as in FIG.
[0019]
As shown in FIG. 6, when the concave portion 12 a is provided in the comb shape 5 a, a part of the lead or the lead alloy melted by the burner 7 flows into the concave portion 12 a, and finally solidifies and is formed in the lower portion of the pedestal 4. A projection is formed. FIG. 7 is a cross-sectional side view of a main part showing the protrusion 12b formed by the above method. By observing the shape of the convex portion 12b shown in FIG. 7, if the shape has the same shape as the concave portion 12a provided in the comb 5a, it can be determined that the pedestal is sufficiently melted and the welding state is good. Conversely, if the shape is not perfect, the pedestal is not sufficiently melted and it can be determined that the welding state is not good.
[0020]
Next, in order to specifically show the effect of the present invention, the positive and negative electrode grids made of a Pb-0.06% by mass Ca-1.5% by mass Sn alloy are filled and aged with ordinary positive and negative electrode active materials, respectively. Drying to prepare unformed positive / negative plates, and stacking 8 positive plates and 9 negative plates via a separator to prepare a group of electrodes for a nominal voltage of 2 V and a rated capacity of 200 Ah (10 hR). .
[0021]
A set of 200 straps formed by welding the positive electrode plate ears of the electrode plate group and the conventional pedestal with the integrated pole as shown in FIG. B is defined as 200 straps formed by welding the pedestal 4 provided with the inclined portion 4a according to the first embodiment of the present invention with a burner method. The electrode plate ears of these samples were cut at the lower part of the strap, the strap was clamped on one holding part of the hydraulic tensile tester, the pedestal was clamped on the other holding part, and both were pulled, and the pedestal was strapped. The force (MPa) when peeled from the substrate was recorded. Table 1 shows the results.
[0022]
[Table 1]

[0023]
As shown in Table 1, the average value of the tensile strength of the conventional product A was 26 MPa, and a low value such as the minimum value of 17 MPa occurred, whereas the average value of the product B of the present invention was as large as 30 MPa. Value, the pedestal side portion 41 is provided with an inclined portion 4a, and the flame of the burner is made to easily hit the pedestal side portion 41 during welding, so that the pedestal is sufficiently melted, and the strap 2 and the pedestal 4 are securely welded. It became clear that there was.
[0024]
Next, the following test was conducted to clarify the effect of welding using the comb 5a having the concave portion 12a provided on the upper surface of the comb abutting on the lower portion of the base shown in Example 2.
[0025]
Welding was performed on two types of pedestals, a conventional product and a pedestal having the inclined portion 4a of the present invention, and 200 samples were produced for each sample. AA using the conventional pedestal was designated as AA, and BB using the pedestal of the present invention. After welding and solidifying these samples, the shape of the convex portion 12b formed at the lower portion of the pedestal by the concave portion 12a was observed. The number of pedestals with incomplete part shapes was determined. Table 2 shows the results.
[0026]
[Table 2]

[0027]
As shown in Table 2, as a result of observing the shape of the convex portion 12b, when the conventional pedestal was used, eleven incomplete convex portions were generated, and the welding between the pedestal and the electrode plate group was not sufficient. It is presumed that many things are occurring. On the other hand, the one provided with the inclined portion 4a on the side of the pedestal also had a slight but incomplete shape as one. Eleven incomplete AA products and one incomplete BB product were subjected to a tensile test under the same conditions as in Table 1. Table 3 shows the results.
[0028]
[Table 3]

[0029]
As shown in Table 3, it was clarified that all of the incomplete convex portions had a low tensile strength and the welding state was not good, and observation of the convex portions was appropriate as a means for judging the welding state. It became clear.
[0030]
In the case of the present invention in which the inclined portion is provided on the side of the pedestal, a very small but incomplete shape has been found. It turned out that things could be obtained.
[0031]
【The invention's effect】
When a pedestal with integrated poles and an electrode plate ear group are partially melted by a burner to form a strap, the flame of the burner does not easily hit the pedestal due to its structure, and the pedestal is not sufficiently melted. A strap is formed, leaving a gap between the strap and the pedestal. Was. On the other hand, according to the present invention, the flame of the burner is easily and uniformly melted by hitting the entire pedestal side portion by using the pedestal provided with the inclined portion descending toward the electrode plate group on the pedestal side portion. At the same time, the molten lead or lead alloy flows to the lower part due to the slope, and a new lead surface is constantly exposed, so that the pedestal is sufficiently melted, and the pedestal and the electrode plate group are easily integrated and a good welding condition is obtained. can get.
[0032]
Furthermore, in order to obtain a reliable welding state, a method is used in which a comb is provided with a concave portion on the upper surface portion of the comb which contacts the lower portion of the pedestal, and when the pedestal is molten, a part of the molten lead flows into the concave portion. After the solidification of the strap, the welding state can be known by observing the shape of the projection formed at the lower part of the pedestal, and the welding accuracy by the burner method is greatly improved, and the industrial effect is extremely large.
[0033]
[Brief description of the drawings]
FIG. 1 is an essential part perspective view showing a state where a strap is formed by a burner method.
FIG. 2 is a side sectional view showing a state where a strap is formed by a burner method.
FIG. 3 is a side view of a main part showing a malfunction state of the strap part when welding is performed by a burner method.
FIGS. 4A and 4B are main part side views showing a pedestal according to the first embodiment of the present invention.
FIG. 5 is a side sectional view showing a state where a strap according to the first embodiment is formed.
FIG. 6 is a side sectional view showing a state where a strap according to a second embodiment of the present invention is formed;
FIG. 7 is a sectional side view of a main part showing shapes of a strap and a pedestal obtained according to the second embodiment.
[Explanation of symbols]
1 Pole plate ear group 2 Strap 3 Pole
4 Pedestal 41 Pedestal side 4a Inclined part 5 provided on pedestal side Comb 5a Comb 7 provided with recess on upper surface Burner 12a Comb provided recess 12b Convex formed on bottom of pedestal

Claims

In a method of manufacturing a lead storage battery in which a strap is formed by a burner method using a comb shape and a pedestal of a pole and a group of pole plates are joined,
A method of manufacturing a lead storage battery, characterized in that a side portion of the pedestal on the side of the electrode plate group has an inclined portion descending toward the direction of the electrode plate.

In a method of manufacturing a lead storage battery in which a strap is formed by a burner method using a comb shape and a pedestal of a pole and a group of pole plates are joined,
A method for manufacturing a lead-acid battery, wherein a concave portion is provided in a portion abutting on a lower portion of a comb-shaped pedestal.