JP4876323B2 - Lead acid battery - Google Patents

Lead acid battery Download PDF

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Publication number
JP4876323B2
JP4876323B2 JP2001105457A JP2001105457A JP4876323B2 JP 4876323 B2 JP4876323 B2 JP 4876323B2 JP 2001105457 A JP2001105457 A JP 2001105457A JP 2001105457 A JP2001105457 A JP 2001105457A JP 4876323 B2 JP4876323 B2 JP 4876323B2
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Japan
Prior art keywords
lead
alloy
acid battery
pole
copper
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Expired - Fee Related
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JP2001105457A
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JP2002304982A (en
Inventor
勲 井門
宗良 野田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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    • 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

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Description

【０００１】
【発明の属する技術分野】
本発明は電池、特に極柱端子部の電気抵抗を考慮して内部に銅もしくは銅合金を鋳込んだ構成の極柱を備えた鉛蓄電池に関するものである。
【０００２】
【従来の技術】
鉛蓄電池の端子部の構造の一つとして、図２に示したような極柱本体の主体を構成する鉛合金１に銅もしくは銅合金からなる芯金２の一部を埋没させ、芯金２の頂面２ａを鉛合金１から露出させた構造の端子が特に大容量の鉛蓄電池において使用されている。これは端子の電気抵抗を低減させるとともに、ボルト３あるいはナット部４等で接続板５等の接続手段を形成することを主な目的とし、芯金２を鉛合金１に鋳込むことによって製造される。このような芯金２は電槽内部で極板耳を集合溶接する棚部に接合され、電槽蓋６に設けた貫通孔６ａを通して電池外部に取り出される。
【０００３】
ここで芯金２と鉛合金１との密着性を確保することは鉛蓄電池の信頼性を確保する上で重要である。特に芯金２と鉛合金１との密着性が損なわれた場合には極柱の電気抵抗が大きくなり、大電流が取り出せなくなる。また、芯金２はボルト締め付け時の締め付けトルクを受ける。このような締め付けトルクによって芯金２と鉛合金１との間の密着性が低下する場合があった。このような芯金２と鉛合金１との間の密着性の低下を避けるために芯金表面にハンダ合金層を形成した後に芯金を鉛合金に鋳込むことが行われている。そしてこの芯金と鉛合金との間の密着性を確保するためにハンダ合金層の厚みを少なくとも３０μｍ以上とすることが必要であり、ハンダ合金を用いる分、部品コストが高くなってしまっていた。
【０００４】
【発明が解決しようとする課題】
本発明はコストを上げることなく前記したような課題、すなわち、芯金と極柱本体の主体を構成する鉛合金との密着性の低下を抑制して電気抵抗の少ない極柱構造を備えた鉛蓄電池を提供するものである。
【０００５】
【課題を解決するための手段】
前記した課題を解決するため、請求項１に記載の発明は銅製もしくは銅合金製の芯金の表面の少なくとも一部にフラックス剤を塗布し、前記芯金のフラックス剤を塗布した面の少なくとも一部を鉛合金に鋳込んで構成される極柱を備え、前記芯金の極柱本体を構成する鉛合金によって覆われる表面に銅層を備えるとともに、前記銅層の表面に鉛合金層を備えた鉛蓄電池を示すものである。
【０００７】
本発明の請求項２に記載の発明は、前記鉛合金層は鉛と錫の合金であり、芯金を鋳込む極柱本体の主体を構成する鉛合金中の錫の含有率は前記鉛合金層中の錫の含有率よりも少なくしたことを特徴とする請求項１に記載の鉛蓄電池を示すものである。
【０００８】
本発明の請求項３に記載の発明は前記鉛合金層を２０μｍ以下の厚みに形成したことを特徴とする請求項１ないし２のいずれかに記載の鉛蓄電池を示すものである。
【０００９】
本発明の請求項４に記載の発明は、前記フラックス剤は有機ロジンとしたことを特徴とする請求項１ないし３のいずれかに記載の鉛蓄電池を示すものである。
【００１０】
本発明の請求項５に記載の発明は前記芯金を銅−亜鉛合金製とすることを特徴とする請求項１ないし４のいずれかに記載の鉛蓄電池を示すものである。
【００１１】
【発明の実施の形態】
以下に本発明の実施の形態について記載する。
【００１２】
図１は本発明による鉛蓄電池の極柱１０の断面の構成を示す図である。銅と亜鉛との合金である黄銅製の芯金１１には少なくとも極柱１０本体の主体を構成する鉛合金１２によって覆われる面に銅層１３を設け、さらに銅層１３上の少なくとも鉛合金１２によって覆われる面に鉛合金層１４が設けてある。すなわち黄銅製の芯金１１の表面には銅層１３と鉛合金層１４が形成されている。ここで銅層１３と鉛合金層１４は電解メッキによって形成されており、芯金１１と銅層１３および銅層１３と鉛合金層１４間の密着性は強固となっている。よって芯金１１と鉛合金１２の密着性は、鉛合金層１４と鉛合金１２との密着性をいかに強固にするかにかかっている。これまでは鉛合金層１４の厚みを厚くすることで対応してきた。
【００１３】
本発明の極柱１０はこの銅層１３，鉛合金層１４を形成した芯金１１を少なくとも鉛合金１２によって覆われる面の一部にフラックス剤として有機ロジンをイソプロピルアルコールに溶かした溶剤を塗布し、鉛合金１２に鋳込むことで形成される。このように有機ロジンを塗布した後に鋳造を行うことで厚みが比較的薄い鉛合金層１４であっても有機ロジンが鋳込む際に鉛合金層１４の表面の酸化被膜を取り除く働きがあるために、鉛合金層１４と鉛合金１２とを強固に密着させることが可能である。
【００１４】
このようにして得た鉛蓄電池極柱を用いて鉛蓄電池を構成することにより、本発明の鉛蓄電池を得ることができる。
【００１５】
【実施例】
以下に本発明の効果を示す実施例について説明する。
【００１６】
黄銅製の芯金１１に銅メッキを施した後、芯金１１の表面に５０質量％鉛−５０質量％錫のハンダ層（鉛−錫合金層）を電解メッキにより形成した。この鉛−錫合金層の厚みは表１に示したように変化させ、その表面にフラックス剤として有機ロジンのイソプロピルアルコール溶液を塗布した。その後、芯金１１を鋳型に装着し、鉛−２．０質量％錫合金（極柱本体の主体を構成する鉛−錫合金）を流し込むことにより、鉛−錫合金層の周囲を鉛−錫合金で鋳込むことにより図１に示した鉛蓄電池極柱を作製した。
【００１７】
なお、芯金１１は６角柱（サイズＭ１６）形状であって、その頂面にナット部１５を形成している。極柱外形は３８．０ｍｍとした。極柱頂面と芯金頂面とは同一面とする。
【００１８】
ここで比較のために鉛−錫合金層を形成しないもの、フラックス剤を塗布しないものを作製した。これらの鉛蓄電池極柱の構成を表１に示す。
【００１９】
【表１】

Figure 0004876323
【００２０】
表１に示した鉛蓄電池極柱について芯金と芯金を鋳込む鉛−錫合金との密着性を評価した。評価方法は芯金１１の頂面に設けたナット部１５にボルト（図示せず）をトルクレンチで締め付け、芯金１１のがたつきが発生するトルクを確認した。これらの結果を表１に示す。
【００２１】
表１に示した結果によればフラックス剤塗布の有無により、最適な鉛−錫合金層の厚みが変化していることがわかる。特に本発明の構成によれば、従来例の構成に比較して鉛−錫合金層の厚さを薄くしても芯金と極柱本体の主体を構成する鉛−錫合金との間の密着性を改善することができることがわかる。
【００２２】
【発明の効果】
以上のように本発明によれば、鉛合金のメッキ厚みを厚くすることなく芯金と鉛合金の密着性に優れ、この間の電気抵抗の増大を抑制した鉛蓄電池極柱を用いた鉛蓄電池を安価に提供することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態による鉛蓄電池の極柱の断面図
【図２】従来例による鉛蓄電池の極柱の断面図
【符号の説明】
１，１２ 鉛合金
２，１１ 芯金
２ａ 芯金２の頂面
３ ボルト
４，１５ ナット部
５ 接続板
６ 電槽蓋
６ａ 貫通孔
１０ 極柱
１３ 銅層
１４ 鉛合金層[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery, and more particularly to a lead-acid battery including a pole column having a structure in which copper or a copper alloy is cast inside in consideration of electric resistance of a pole column terminal portion.
[0002]
[Prior art]
As one of the structures of the terminal part of the lead-acid battery, a part of the core metal 2 made of copper or copper alloy is buried in the lead alloy 1 constituting the main body of the pole body as shown in FIG. A terminal having a structure in which the top surface 2a is exposed from the lead alloy 1 is used particularly in a large-capacity lead-acid battery. The main purpose of this is to reduce the electrical resistance of the terminal and to form a connection means such as a connection plate 5 with bolts 3 or nuts 4 or the like. The Such a metal core 2 is joined to a shelf portion for collectively welding the electrode plate ears inside the battery case, and is taken out of the battery through a through hole 6 a provided in the battery case cover 6.
[0003]
Here, securing the adhesion between the cored bar 2 and the lead alloy 1 is important in securing the reliability of the lead-acid battery. In particular, when the adhesion between the cored bar 2 and the lead alloy 1 is impaired, the electric resistance of the pole column increases and a large current cannot be taken out. Further, the core metal 2 receives a tightening torque at the time of bolt tightening. In some cases, the adhesion between the metal core 2 and the lead alloy 1 may be reduced by such tightening torque. In order to avoid such a decrease in adhesion between the cored bar 2 and the lead alloy 1, a cored bar is cast into the lead alloy after a solder alloy layer is formed on the surface of the cored bar. And, in order to secure the adhesion between the core metal and the lead alloy, it is necessary to make the thickness of the solder alloy layer at least 30 μm or more, and the cost of parts is increased by using the solder alloy. .
[0004]
[Problems to be solved by the invention]
The present invention has the above-described problem without increasing the cost, that is, lead having a pole column structure with low electrical resistance by suppressing a decrease in adhesion between the core metal and the lead alloy constituting the main body of the pole column body. A storage battery is provided.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a flux agent is applied to at least a part of the surface of a copper or copper alloy core bar, and at least one of the surfaces of the core bar coated with the flux agent. A pole column formed by casting a part into a lead alloy, a copper layer on the surface covered with the lead alloy constituting the pole column body of the cored bar, and a lead alloy layer on the surface of the copper layer The lead acid battery is shown.
[0007]
According to a second aspect of the present invention, the lead alloy layer is an alloy of lead and tin, and the content of tin in the lead alloy constituting the main body of the pole column body into which the core metal is cast is the lead alloy. The lead storage battery according to claim 1, wherein the content of tin is smaller than the content of tin in the layer .
[0008]
The invention according to claim 3 of the present invention shows the lead-acid battery according to any one of claims 1 to 2, wherein the lead alloy layer is formed to a thickness of 20 μm or less.
[0009]
The invention according to claim 4 of the present invention is the lead storage battery according to any one of claims 1 to 3 , wherein the fluxing agent is an organic rosin.
[0010]
According to a fifth aspect of the present invention, there is provided the lead-acid battery according to any one of the first to fourth aspects, wherein the cored bar is made of a copper-zinc alloy.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
[0012]
FIG. 1 is a diagram showing a cross-sectional configuration of a pole 10 of a lead storage battery according to the present invention. A brass core 11 made of copper and zinc is provided with a copper layer 13 on a surface covered with at least a lead alloy 12 constituting the main body of the pole column 10, and at least a lead alloy 12 on the copper layer 13. A lead alloy layer 14 is provided on the surface covered by That is, a copper layer 13 and a lead alloy layer 14 are formed on the surface of the brass cored bar 11. Here, the copper layer 13 and the lead alloy layer 14 are formed by electrolytic plating, and the adhesion between the core metal 11 and the copper layer 13 and between the copper layer 13 and the lead alloy layer 14 is strong. Therefore, the adhesion between the core metal 11 and the lead alloy 12 depends on how strong the adhesion between the lead alloy layer 14 and the lead alloy 12 is. Until now, this has been dealt with by increasing the thickness of the lead alloy layer 14.
[0013]
In the pole column 10 of the present invention, a metal bar 11 on which the copper layer 13 and the lead alloy layer 14 are formed is coated on at least a part of the surface covered with the lead alloy 12 with a solvent obtained by dissolving an organic rosin in isopropyl alcohol as a flux agent. The lead alloy 12 is cast. Since casting is performed after coating the organic rosin in this manner, even if the lead alloy layer 14 is relatively thin, the organic rosin has a function of removing the oxide film on the surface of the lead alloy layer 14 when casting. The lead alloy layer 14 and the lead alloy 12 can be firmly adhered.
[0014]
The lead storage battery of the present invention can be obtained by configuring the lead storage battery using the thus obtained lead storage battery pole.
[0015]
【Example】
Examples showing the effects of the present invention will be described below.
[0016]
After the brass metal core 11 was plated with copper, a 50 mass% lead-50 mass% tin solder layer (lead-tin alloy layer) was formed on the surface of the metal core 11 by electrolytic plating. The thickness of the lead-tin alloy layer was changed as shown in Table 1, and an isopropyl alcohol solution of organic rosin was applied to the surface as a fluxing agent. Thereafter, the core metal 11 is mounted on a mold, and lead-2.0 mass% tin alloy (lead-tin alloy constituting the main body of the pole pole body) is poured into the lead-tin alloy layer so as to surround the lead-tin alloy layer. The lead-acid battery pole shown in FIG. 1 was produced by casting with an alloy.
[0017]
The cored bar 11 has a hexagonal prism (size M16) shape, and a nut portion 15 is formed on the top surface thereof. The outer shape of the pole column was 38.0 mm. The top surface of the pole column and the top surface of the core bar are the same surface.
[0018]
Here, for comparison, a lead-tin alloy layer and a flux agent were not applied. Table 1 shows the structure of these lead storage battery poles.
[0019]
[Table 1]
Figure 0004876323
[0020]
The lead-acid battery poles shown in Table 1 were evaluated for adhesion between the cored bar and the lead-tin alloy into which the cored bar was cast. In the evaluation method, a bolt (not shown) was fastened to the nut portion 15 provided on the top surface of the core metal 11 with a torque wrench, and the torque at which the shakiness of the core metal 11 occurred was confirmed. These results are shown in Table 1.
[0021]
According to the results shown in Table 1, it can be seen that the optimum lead-tin alloy layer thickness varies depending on whether or not the flux agent is applied. In particular, according to the configuration of the present invention, the adhesion between the cored bar and the lead-tin alloy constituting the main body of the pole column body even if the thickness of the lead-tin alloy layer is reduced compared to the configuration of the conventional example. It can be seen that the property can be improved.
[0022]
【Effect of the invention】
As described above, according to the present invention, there is provided a lead-acid battery using a lead-acid battery pole column that has excellent adhesion between the core metal and the lead alloy without increasing the plating thickness of the lead alloy and suppresses an increase in electrical resistance during this period. It can be provided at low cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pole column of a lead-acid battery according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of a pole column of a lead-acid battery according to a conventional example.
DESCRIPTION OF SYMBOLS 1,12 Lead alloy 2,11 Core metal 2a Top surface 3 of core metal 2 Bolt 4,15 Nut part 5 Connection plate 6 Battery case cover 6a Through hole 10 Polar pillar 13 Copper layer 14 Lead alloy layer

Claims (5)

銅製もしくは銅合金製の芯金の表面の少なくとも一部にフラックス剤を塗布し、前記芯金のフラックス剤を塗布した面の少なくとも一部を極柱本体の主体を構成する鉛合金に鋳込んで構成した極柱を備え、前記芯金の極柱本体を構成する鉛合金によって覆われる表面に銅層を備えるとともに、前記銅層の表面に鉛合金層を備えたことを特徴とする鉛蓄電池。A flux agent is applied to at least a part of the surface of a copper or copper alloy core metal, and at least a part of the surface of the core metal coated with the flux agent is cast into a lead alloy constituting the main body of the pole pole body. A lead-acid battery comprising a pole pole configured, a copper layer on a surface covered with a lead alloy constituting the pole pole main body of the core metal, and a lead alloy layer on the surface of the copper layer . 前記鉛合金層は鉛と錫の合金であり、前記芯金を鋳込む極柱本体の主体を構成する鉛合金中の錫の含有率は前記芯金の表面に形成された前記鉛合金層中の錫の含有率よりも少なくしたことを特徴とする請求項１に記載の鉛蓄電池。 The lead alloy layer is an alloy of lead and tin , and the content of tin in the lead alloy constituting the main body of the pole column body into which the core metal is cast is in the lead alloy layer formed on the surface of the core metal. The lead acid battery according to claim 1, wherein the content of tin is less than the content of tin. 前記鉛合金層を２０μｍ以下の厚みに形成したことを特徴とする請求項１ないし２のいずれかに記載の鉛蓄電池。Lead-acid battery according to any one of claims 1 to 2, characterized in that the formation of the lead alloy layer to a thickness of less than 20 [mu] m. 前記フラックス剤は有機ロジンとしたことを特徴とする請求項１ないし３のいずれかに記載の鉛蓄電池。The fluxing agent is a lead acid battery according to any one of claims 1 to 3, characterized in that the organic rosin. 前記芯金は銅−亜鉛合金製とした請求項１ないし４のいずれかに記載の鉛蓄電池。The lead acid battery according to any one of claims 1 to 4 , wherein the core metal is made of a copper-zinc alloy.
JP2001105457A 2001-04-04 2001-04-04 Lead acid battery Expired - Fee Related JP4876323B2 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4749098B2 (en) * 2005-09-16 2011-08-17 古河電池株式会社 Storage battery terminal formation method
CN102139363B (en) * 2010-12-20 2013-06-05 湖北润阳新能源有限公司 Mould for casting post lead part of lead-acid storage battery

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JPS57182965A (en) * 1981-05-07 1982-11-11 Matsushita Electric Ind Co Ltd Manufacture of lead acid battery
JPH01124954A (en) * 1987-11-09 1989-05-17 Yuasa Battery Co Ltd Lead-acid battery
JP3057994B2 (en) * 1994-01-17 2000-07-04 新神戸電機株式会社 Pole for lead storage battery and method of manufacturing the same
JP3714428B2 (en) * 1995-12-15 2005-11-09 株式会社ユアサコーポレーション Lead acid battery terminal
JPH10172535A (en) * 1996-12-05 1998-06-26 Japan Storage Battery Co Ltd Lead-acid battery
JP2002025536A (en) * 2000-07-10 2002-01-25 Yuasa Corp Terminal for lead-acid battery

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