JP4345141B2

JP4345141B2 - Method for manufacturing lead-acid battery terminal

Info

Publication number: JP4345141B2
Application number: JP18466599A
Authority: JP
Inventors: 澄石原
Original assignee: GS Yuasa Corp
Current assignee: GS Yuasa Corp
Priority date: 1999-06-30
Filing date: 1999-06-30
Publication date: 2009-10-14
Anticipated expiration: 2019-06-30
Also published as: JP2001015097A

Description

【０００１】
【発明の属する技術分野】
本発明は、鉛蓄電池端子部の製造方法に関するもので、詳しくはＰｂ−Ｃａ系合金の端子極柱と、Ｐｂ−Ｓｂ系合金の鉛ブッシングと、Ｐｂ−Ｓｂ系合金のＬ型端子とからなる鉛蓄電池端子部の製造方法に関する。
【０００２】
【従来の技術】
鉛蓄電池端子部の構造の一例を図４に基づいて説明する。１は電槽内に収納されている極群から立ち上がる円柱形の端子極柱、２は蓋３にインサート成形された鉛ブッシングであり、外周に数段の環状突起４が形成され、中心部に円柱形の極柱貫通孔５を有する。そして、該孔５に前記極柱１の上部が挿入されている。６はＬ型端子であり、垂直部６１にボルトを挿通する孔７が形成され、水平部６２に足し鉛１０を注入する孔８が形成されている。端子部は、該孔８に足し鉛（溶融鉛）１０を注入して極柱１と鉛ブッシング２の一部を溶かして極柱１と鉛ブッシング２とＬ型端子６の三者が導電接続されたものである。
【０００３】
この端子部を構成する極柱１と鉛ブッシング２とＬ型端子６は、足し鉛と共に、通常鉛を主体とするＰｂ−Ｓｂ系合金で作製されており、同系統の合金で溶着されていたため、溶着強度、溶着部表面の外観等において特に問題はなかった。しかし、近年自己放電を少なくする目的でＰｂ−Ｃａ系合金の極板が多く使用されてきた。この電池の端子極柱を従来通りＰｂ−Ｓｂ系合金にしてＣＯＳ（キャストオンストラップ）で作製しようとすると、ストラップもＰｂ−Ｓｂ系合金となり、ストラップと極板とが異種合金で溶着されることになり、溶着時にＣａとＳｂが混ざり合い、電池としての使用中に電解液の硫酸と反応してストラップと極板との溶着部が腐食し、極板がストラップから早期に脱落するという不具合があった。
【０００４】
上記不具合を解決するために、端子極柱とストラップをＰｂ−Ｃａ系合金とし、電解液に晒される鉛ブッシングもＳｂを含まない鉛合金にすることが提案された。しかし、これら部品や足し鉛にＰｂ−Ｃａ系合金を用いると、特開平３−２６３７５６号公報に記載されているように、溶湯の流れが極めて悪く、全体を隈なく溶着するのが難しかった。特に極柱と鉛ブッシングにＰｂ−Ｃａ系合金を用いると溶着が不完全になり、液密不良になることがあった。また、極柱と鉛ブッシングの溶着を完全にしようとすると、Ｌ型端子の孔８の内壁を溶融し過ぎ、該壁が崩れて足し鉛による溶着が不完全になるという不具合が発生した。これを防止するために、Ｌ型端子の水平部の肉厚を厚くすればよいが、溶湯の残滓が出易くなり、溶着後の外観が見苦しくなるという新たな問題点が発生した。
【０００５】
また、Ｌ型端子６をＰｂ−Ｃａ系合金や純鉛で作製すると、強度的に弱くなり、外部接続線を前記孔７にボルトで接続して外力が加わった場合に破損する恐れがあった。そのため、一般にＬ型端子は強度的に優れたＰｂ−Ｓｂ系合金とされていた。
【０００６】
すなわち、従来のＰｂ−Ｃａ系合金の極板を用いた鉛蓄電池では、端子部の溶着部の腐食を防止し、溶着を完全にすると共にＬ型端子の強度を優れたものにするために、極柱にＰｂ−Ｃａ系合金を用い、Ｌ型端子にＰｂ−Ｓｂ系合金を用い、しかも鉛ブッシングや足し鉛にＣａおよびＳｂを含まない鉛合金を用いていた。
【０００７】
【発明が解決しようとする課題】
しかし、上記鉛蓄電池の製造方法は、鉛ブッシング２の極柱貫通孔５に極柱１を挿入した後、該極柱の上方に水平部６２の孔８が重なるようにＬ型端子６を載せ、孔８内で足し鉛を溶融させて、極柱１と鉛ブッシング２とＬ型端子６の三者を足し鉛で溶接していたので、Ｌ型端子のＳｂと極柱のＣａが混ざり合い、溶着部が使用中に腐食するという問題点を完全には解決できなかった。
【０００８】
本発明は、上記問題点に鑑みてなされたものであって、その目的とするところは、端子部の溶着部が電池の使用中に腐食して漏液することのない鉛蓄電池の端子部の製造方法を提供することにある。
【０００９】
【課題を解決するための手段】
上記目的を達成するため、本発明は、Ｐｂ−Ｃａ系合金からなる端子極柱と、ＣａおよびＳｂを含まない鉛合金からなる鉛ブッシングと、Ｐｂ−Ｓｂ系合金からなるＬ型端子とをＣａおよびＳｂを含まない鉛合金からなる足し鉛で一体に溶着する鉛蓄電池端子部の製造方法において、前記端子極柱と鉛ブッシングとを溶着して、該溶着部が凝固した後に、前記足し鉛を加えて前記端子極柱と鉛ブッシングとＬ型端子を一体に溶着することを特徴とする。
【００１０】
【発明の実施の形態】
以下、本発明の実施例について図面を参照して説明する。
【００１１】
図１〜３は、本発明の一実施例を示す説明図であり、１はＰｂ−Ｃａ合金からなる円柱形の端子極柱、２は樹脂製の蓋３に一体に成形されたＰｂ−Ｓｎ合金からなる鉛ブッシングであり、周面に環状の突起４が形成され、中央に円柱形の孔５が形成されている。６はＬ型端子であり、垂直部６１に外部接続線と接続するためのボルト挿入孔７が形成され、水平部６２に溶融した足し鉛１０を注入する孔８が形成されている。９は筒状の治具であり、内径が鉛ブッシング２の孔５の径より大きく、かつ下部外形がＬ型端子６の孔８の径より小さく形成されている。
【００１２】
先ず、図１に示すように、電槽に収納された極群から立ち上がる端子極柱１を、該極柱の上面が鉛ブッシングの上面と略一致する程度まで鉛ブッシング２の孔５に挿入する。そして、この鉛ブッシング２が取り付けられた蓋３の上にＬ型端子６を載置し、鉛ブッシング２の孔５の上にＬ型端子６の孔８が重なるようにする。
【００１３】
次に、図２のように、Ｌ型端子６の孔８に治具９をはめ込み、上面からガスバーナーで極柱１と鉛ブッシング２の上面に火炎を当て、両者を溶かして接続する。溶着部分１１を図３の点線で示す。
【００１４】
次に、極柱１と鉛ブッシング２の溶着部が凝固した後、前記治具９を穴８から取り除き、該穴８にＰｂ−Ｓｎ合金からなる足し鉛１０の棒を近付け、前記ガスバーナーで該棒と、孔８の壁と、極柱１と鉛ブッシング２の溶着部１１上部とを溶かして、図３のように孔８を足し鉛１２で満たして極柱１と鉛ブッシング２と端子６を導電接続する。
【００１５】
この様にして作製した本発明に係る鉛蓄電池Ａと、従来方法により作製した鉛蓄電池Ｂをそれぞれ１０個ＳＢＡの寿命試験に供し、サイクル中の端子部からの漏液を観察した。その結果を表１に示す。
【００１６】
なお、電池Ａ，Ｂは、定格容量３５ＡＨ／５ＨＲのものである。
【００１７】
【表１】

【００１８】
表１より本発明に係る電池Ａは、寿命に至るサイクル数になっても漏液が見られなかった。しかし、従来方法による電池Ｂは、使用中に漏液が観察された。従って、本発明は、従来方法に比べ腐食を防止でき、液密性に優れる鉛蓄電池の端子部を形成できることがわかった。
【００１９】
なお、本実施例のように、足し鉛にＰｂ−Ｓｎ合金を用いると、溶着部の外観を綺麗にでき、硬度も確保できるので、品質の優れた鉛蓄電池の端子部が得られる。
【００２０】
【発明の効果】
本発明は、以上説明した通り、端子極柱にＰｂ−Ｃａ系合金を用い、Ｌ型端子のＰｂ−Ｓｂ系合金を用い、鉛ブッシングおよび足し鉛にＣａおよびＳｂを含まない鉛合金を用いた鉛蓄電池の端子部の形成方法を、最初に鉛ブッシングと極柱を溶着して凝固させ、次に足し鉛を用いて前記溶着部分にＬ型端子を溶着させる、いわゆる二段溶着方法とすることにより、電池の使用中に腐食が起こり難く、漏液の起こらない鉛蓄電池の端子部を提供できる。
【図面の簡単な説明】
【図１】鉛ブッシングと極柱の溶着部の上面にＬ型端子を載置した状態を示す本発明の説明図である。
【図２】鉛ブッシングと極柱の溶着部の上面に治具を用いてＬ型端子を溶着する方法を示す本発明の説明図である。
【図３】本発明により完成した鉛蓄電池の端子部の断面図である。
【図４】従来の方法で完成した鉛蓄電池の端子部の断面図である。
【符号の説明】
１端子極柱
２鉛ブッシング
６Ｌ型端子
１０足し鉛[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a lead-acid battery terminal, and more specifically, comprises a terminal pole of a Pb—Ca alloy, a lead bushing of a Pb—Sb alloy, and an L-type terminal of a Pb—Sb alloy. It is related with the manufacturing method of a lead storage battery terminal part.
[0002]
[Prior art]
An example of the structure of the lead storage battery terminal will be described with reference to FIG. 1 is a cylindrical terminal pole that rises from a pole group housed in the battery case, 2 is a lead bushing that is insert-molded on the lid 3, and several annular projections 4 are formed on the outer periphery, It has a cylindrical pole column through-hole 5. The upper part of the pole 1 is inserted into the hole 5. Reference numeral 6 denotes an L-type terminal, in which a hole 7 through which a bolt is inserted is formed in the vertical part 61, and a hole 8 into which the lead 10 is injected is formed in the horizontal part 62. The terminal part is added to the hole 8 and lead (molten lead) 10 is injected to melt a part of the pole 1 and lead bushing 2 so that the pole 1, lead bushing 2 and L-type terminal 6 are electrically connected. It has been done.
[0003]
The pole column 1, lead bushing 2 and L-type terminal 6 constituting this terminal part are made of Pb—Sb alloy mainly composed of lead together with additional lead, and are welded by the same type of alloy. There was no particular problem in the welding strength, the appearance of the welded portion surface, and the like. However, in recent years, Pb—Ca alloy electrode plates have been frequently used for the purpose of reducing self-discharge. If the terminal pole of this battery is made of a Pb-Sb alloy as before and made by COS (cast on strap), the strap will also be a Pb-Sb alloy, and the strap and the electrode plate will be welded with a different alloy. When Ca is welded, Ca and Sb mix, react with sulfuric acid in the electrolyte during use as a battery, and the weld between the strap and the electrode plate corrodes, causing the electrode plate to fall off the strap early. there were.
[0004]
In order to solve the above problem, it has been proposed that the terminal pole and the strap are made of a Pb—Ca alloy, and the lead bushing exposed to the electrolyte is also made of a lead alloy containing no Sb. However, when a Pb-Ca alloy is used for these parts and additional lead, as described in JP-A-3-263756, the flow of the molten metal is extremely poor, and it is difficult to weld the whole. In particular, when a Pb—Ca alloy is used for the pole column and the lead bushing, the welding may be incomplete, resulting in poor liquid tightness. Further, when trying to completely weld the pole pole and the lead bushing, the inner wall of the hole 8 of the L-type terminal was excessively melted, and the wall collapsed and added, resulting in incomplete welding with lead. In order to prevent this, the thickness of the horizontal portion of the L-shaped terminal may be increased, but a new problem arises that the residue of the molten metal is likely to appear and the appearance after welding becomes unsightly.
[0005]
Further, when the L-type terminal 6 is made of a Pb—Ca alloy or pure lead, the strength is weakened, and there is a possibility that the external connection wire is connected to the hole 7 with a bolt and damaged when an external force is applied. . Therefore, in general, the L-type terminal is a Pb—Sb alloy having excellent strength.
[0006]
That is, in the lead storage battery using the electrode plate of the conventional Pb-Ca alloy, in order to prevent corrosion of the welded portion of the terminal portion, to make the welding complete and to improve the strength of the L-type terminal, A Pb—Ca alloy was used for the pole column, a Pb—Sb alloy was used for the L-type terminal, and a lead bushing or a lead alloy containing no Ca and Sb in the lead was used.
[0007]
[Problems to be solved by the invention]
However, in the method of manufacturing the lead storage battery, after the pole column 1 is inserted into the pole column through hole 5 of the lead bushing 2, the L-type terminal 6 is mounted so that the hole 8 of the horizontal portion 62 overlaps the pole column. Since the lead 8 was melted in the hole 8 and the pole column 1, the lead bushing 2 and the L-type terminal 6 were added and welded with lead, the L-type terminal Sb and the pole column Ca were mixed together. The problem that the welded portion corrodes during use could not be completely solved.
[0008]
The present invention has been made in view of the above-mentioned problems, and the object of the present invention is to provide a lead-acid battery terminal portion in which the welded portion of the terminal portion does not corrode and leak during use of the battery. It is to provide a manufacturing method.
[0009]
[Means for Solving the Problems]
To achieve the above object, the present invention provides a terminal pole made of a Pb—Ca alloy, a lead bushing made of a lead alloy not containing Ca and Sb, and an L-type terminal made of a Pb—Sb alloy. And a lead-acid battery terminal part integrally welded with additional lead made of a lead alloy not containing Sb, the terminal pole and the lead bushing are welded, and after the welded part is solidified, the additional lead is added. In addition, the terminal pole, lead bushing, and L-type terminal are integrally welded.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0011]
1 to 3 are explanatory views showing an embodiment of the present invention, wherein 1 is a cylindrical terminal pole made of a Pb-Ca alloy, and 2 is a Pb-Sn molded integrally with a resin lid 3. It is a lead bushing made of an alloy, an annular projection 4 is formed on the peripheral surface, and a cylindrical hole 5 is formed in the center. Reference numeral 6 denotes an L-type terminal, in which a bolt insertion hole 7 for connecting to an external connection line is formed in the vertical portion 61, and a hole 8 for injecting molten lead 10 is formed in the horizontal portion 62. A cylindrical jig 9 has an inner diameter larger than the diameter of the hole 5 of the lead bushing 2 and a lower outer shape smaller than the diameter of the hole 8 of the L-type terminal 6.
[0012]
First, as shown in FIG. 1, the terminal pole 1 rising from the pole group housed in the battery case is inserted into the hole 5 of the lead bushing 2 to such an extent that the upper surface of the pole pillar substantially coincides with the upper surface of the lead bushing. . Then, the L-type terminal 6 is placed on the lid 3 to which the lead bushing 2 is attached, and the hole 8 of the L-type terminal 6 overlaps the hole 5 of the lead bushing 2.
[0013]
Next, as shown in FIG. 2, a jig 9 is fitted into the hole 8 of the L-shaped terminal 6, and a flame is applied to the upper surface of the pole column 1 and the lead bushing 2 with a gas burner from the upper surface, and both are melted and connected. The welded portion 11 is indicated by a dotted line in FIG.
[0014]
Next, after the welded portion between the pole 1 and the lead bushing 2 is solidified, the jig 9 is removed from the hole 8, and an additional lead 10 rod made of Pb—Sn alloy is brought close to the hole 8, and the gas burner is used. The rod, the wall of the hole 8 and the upper part of the welded part 11 of the pole column 1 and the lead bushing 2 are melted, and the hole 8 is added and filled with lead 12 as shown in FIG. 6 is conductively connected.
[0015]
Each of the lead storage battery A according to the present invention thus manufactured and the lead storage battery B manufactured by the conventional method was subjected to a life test of 10 SBAs, and leakage from the terminal portion during the cycle was observed. The results are shown in Table 1.
[0016]
The batteries A and B have a rated capacity of 35 AH / 5HR.
[0017]
[Table 1]

[0018]
From Table 1, the battery A according to the present invention showed no leakage even when the number of cycles reached the end of its life. However, leakage of the battery B according to the conventional method was observed during use. Therefore, it has been found that the present invention can form a terminal part of a lead storage battery that can prevent corrosion and is excellent in liquid tightness as compared with the conventional method.
[0019]
In addition, when a Pb—Sn alloy is used for the added lead as in this embodiment, the appearance of the welded portion can be made beautiful and the hardness can be secured, so that a terminal portion of a lead storage battery having excellent quality can be obtained.
[0020]
【The invention's effect】
As described above, the present invention uses a Pb—Ca alloy for the terminal pole, uses a Pb—Sb alloy for the L-type terminal, uses a lead bushing and a lead alloy containing no Ca and Sb in the lead. The lead storage battery terminal portion is formed by a so-called two-step welding method in which a lead bushing and a pole column are first welded and solidified, and then an L-shaped terminal is welded to the welded portion using lead. Thus, it is possible to provide a terminal portion of a lead storage battery that is unlikely to corrode during use of the battery and that does not leak.
[Brief description of the drawings]
FIG. 1 is an explanatory view of the present invention showing a state in which an L-type terminal is placed on the upper surface of a welded portion of a lead bushing and a pole column.
FIG. 2 is an explanatory view of the present invention showing a method of welding an L-type terminal using a jig on the upper surface of a welded portion of a lead bushing and a pole column.
FIG. 3 is a cross-sectional view of a terminal portion of a lead storage battery completed according to the present invention.
FIG. 4 is a cross-sectional view of a terminal portion of a lead storage battery completed by a conventional method.
[Explanation of symbols]
1 Terminal pole 2 Lead bushing 6 L-type terminal 10 Additional lead

Claims

A terminal pole made of a Pb—Ca alloy, a lead bushing made of a lead alloy not containing Ca and Sb, and an L-type terminal made of a Pb—Sb alloy, and a lead made of a lead alloy not containing Ca and Sb In the method of manufacturing a lead-acid battery terminal portion that is integrally welded with the lead electrode, the terminal pole column and the lead bushing are welded, and after the weld portion is solidified, the lead is added to the terminal pole column and the lead bushing and L. A method for manufacturing a lead-acid battery terminal part, wherein the mold terminals are welded together.