JP4073674B2 - Method for producing lead-acid battery - Google Patents

Method for producing lead-acid battery Download PDF

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Publication number
JP4073674B2
JP4073674B2 JP2002020382A JP2002020382A JP4073674B2 JP 4073674 B2 JP4073674 B2 JP 4073674B2 JP 2002020382 A JP2002020382 A JP 2002020382A JP 2002020382 A JP2002020382 A JP 2002020382A JP 4073674 B2 JP4073674 B2 JP 4073674B2
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Japan
Prior art keywords
electrode plate
plate group
cover
battery case
lead
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JP2003223925A (en
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光 坂本
淳 緑川
淳 古川
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Furukawa Battery Co Ltd
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Furukawa Battery 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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  • Connection Of Batteries Or Terminals (AREA)

Description

【０００１】
【発明の属する技術分野】
この発明は鉛蓄電池、特にシール型鉛蓄電池の製造方法に関する。
【０００２】
【従来の技術】
従来から、シール型鉛蓄電池は合成樹脂で形成された電槽が用いられ、その内部が仕切りられて形成されたセル室の個々にその上部から極板群を挿入し、次いで隣り合うセル室内の極板群のストラップの立ち上がり部相互をセル室に設けた貫通孔を介して抵抗溶接で接続し、その後電槽の上部に蓋をしこの蓋体をヒートシールにより電槽の周囲の上部および中仕切りの上部に溶着することでその製造が行われている。
【０００３】
こうした鉛蓄電池の製造に当たっては、極板群の挿入に際して極板群の端部が電槽の上部に接触し、この接触で極板群のペーストが脱落するといった問題が往々にして生じていた。そこで、セル室の上部に極板群挿入用ガイドを差し込み、この挿入用ガイドを通してセル室内に極板群を挿入し、極板群挿入後にこの挿入用ガイドを抜き取ることが一般に行なわれている。
【０００４】
ところで、この従来の鉛蓄電池の製造方法では、抵抗溶接法によってセル間を極板のストラップの立ち上がり相互で接続するとき、アーク発生による接続不良が発生することがあった。特に、極板群挿入後の圧迫度が５０kgf/dm2以上である場合は接続不良がより多く発生することが認められたものである。
【０００５】
これについて調査したところ、電槽のセルに極板群を挿入する際に、最も外側に位置する極板が電槽のセルの隔壁にこすれて活物質の粉が脱落し、これがセル間接続をするために設けた貫通孔の部分の内側に付着し、抵抗溶接を妨げる原因となっていることが分かった。特に、シール型電池では長寿命化を図るために極板群の圧迫強度を５０kgf/dm2以上とすることが試みられているが、このようにすると極板群がセル隔壁に強くこすれるために発生する活物質が多くなり、それによってセル間に設けた貫通孔の内側に付着する粉の量が多く著しく抵抗溶接を妨げることになっていた。
【０００６】
【発明が解決しようとする課題】
この発明は、電槽の隔壁に設けた貫通孔の部分に覆いをして、電槽のセルに極板群を挿入する際に、極板群が電槽の隔壁に接触して極板群の活物質の一部が脱落しても、それがセル間の貫通孔内に付着して抵抗溶接を妨げ、セル間接続で不良を生じないようにするものである。
【０００７】
【課題を解決するための手段】
この発明は、電槽に極板群を挿入する際に、一対の側板が互いにテーパ状に拡がって対向する導入部と、この導入部の下端に連なって一対の側板が互いに平行を保って対向するガイド部とからなる極板群の挿入用ガイドを電槽に設け、
この挿入用ガイドの側板に密着して覆いを設け、この覆いで抵抗溶接法によるセル間接続をするために設けた電槽内の中仕切りの貫通孔を予め覆って塞ぎ、その後極板群を挿入してから前記覆いを取除き、次いで抵抗溶接法によりセル間接続を行うことを特徴とする鉛蓄電池の製造方法（請求項１）、前記貫通孔の部分の覆いが極板群挿入時のガイドを兼ねることを特徴とする請求項１記載の鉛蓄電池の製造方法（請求項２）および極板群の圧迫度を５０kgf/dm2以上とすることを特徴とする請求項１記載の鉛蓄電池の製造方法（請求項３）である。
【０００８】
【作用】
この発明によると極板群挿入時にセル間接続用の貫通孔の部分を覆うことによりこの貫通孔の部分に活物質の侵入・付着を防ぐことができて、その後の抵抗溶接の不良を抑制することができる。また、この覆いは極板群の挿入のガイドも兼ねることになり極板群の挿入を滑らかにする作用もあって、この点からも活物質の脱落による粉の発生を抑制して抵抗溶接の信頼性を高めることになる。さらに、この覆いは電槽隔壁上端部での活物質粉の付着によるヒートシートの不良を防ぐ作用もある。
【０００９】
【発明の実施の形態】
以下、この発明の一実施形態について図１乃至図３を参照して説明する。
【００１０】
図１は、蓄電池の主要部材である電槽１、極板群２と、電槽１に極板群２を挿入するときに使用するときに用いる極板群の挿入用ガイド３を示している。電槽１は合成樹脂で形成され、内部が平行に並ぶ複数の中仕切り４により複数のセル室５に仕切られている。
【００１１】
このセル室５の中に挿入される極板群２は、それぞれ複数枚の正極板と負極板とセパレータとを交互に積層してなり、その各正極板の耳部の相互、及び各負極板の耳部の相互がそれぞれストラップ６で接続され、かつそのストラップ６の端部上面にセル間接続用の立ち上がり部７が形成された構成となっている。なお、図には一方のストラップ６及び立ち上がり部７のみが示してある。電槽１の中仕切り４の上部には、隣り合うセル室５内に収容された一方の極板群２におけるストラップ６の立ち上がり部７と図示しない他方の極板群におけるストラップの立ち上がり部とを抵抗溶接により接続するためのセル間接続用の貫通孔８が形成されている。
【００１２】
極板群２の挿入用ガイド３は、一対の側板１０が互いにテーパ状に拡がって対向する導入部１１と、この導入部１１の下端に連なって一対の側板１０が互いに平行を保って対向するガイド部１３とで構成されている。
【００１３】
さらに、覆い１４が中仕切り４，４の上部の貫通孔８，８を塞ぐようにして、側板１０に密着して設けられている。この覆い１４の上端は、挿入用ガイド３の導入部１１を構成する側板１０の上端と同じにし、下端は側板１０のガイド部１３の下端に設けられている中仕切り４の貫通孔８を覆ってさらにその下部に達するようにする。ここにおける覆い１４は、例えばポリプロピレンシートで厚さを０．５mmとする。この覆いは予め挿入用ガイド３に接着しておくと、挿入用ガイド３をセル室５の上部内側に差し込むと同時に貫通孔８が覆われる。
【００１４】
このようにした後に、図１に示すように挿入用ガイド３の導入部１１からガイド部１３を通して極板群２を挿入する。図２はセル室５に極板群２が挿入された状態を示したものである。この状態でガイド部１３を用いて電槽１のセル室５に極板群２を挿入すると、極板群の挿入に際して極板群が電槽の隔壁に接触して極板に付着している活物質の一部が脱落しても、それがセル間の貫通孔内に付着するのを回避することが出来るものである。極板群２の挿入後は挿入用ガイド３を抜き取る。
【００１５】
このような工程で電槽１の各セル室５内に順次極板群２を挿入して収容する。各セル室５内に極板群２を収容した後には、隣り合うセル室５内における極板群２のストラップ６の立ち上がり部７相互を貫通孔８を介して溶接してセル間接続を行ない、この後、電槽１の上部に図示しない蓋体を被嵌し、この蓋体をヒートシールにより電槽１の周壁の上部および中仕切り４の上部に溶着する。
【００１６】
なお、従来から極板群挿入に際して用いる極板群２の挿入用ガイド３が、極板群挿入時にセルの中仕切り４の面に圧着されて極板群の挿入後に抜き取り困難となることがあった。これを避けるために、図３に示すようセル室の中仕切り４の上部１５の両側に、極板群挿入用の逃げしろ用の切り欠き部１６を設けることが提案されている（特願平１１−２３０６７５号）。この場合でも、図３に示すように同じようにして覆い１４を用いることができる。図４は図３の中仕切り４の一部を拡大して示したものである。ただし、図示するように、この場合でも切り欠き部１６は貫通孔８にかからないように、その上部の位置まで設けるようにする。
【００１７】
【実施例】
表１に示すように極板群圧迫度を変させて、１２Ｖのシール型鉛蓄電池を公知の方法で製造した。このとき極板群挿入時にセル間接続用の貫通孔部分を図１に示すようにして０．５mmのポリプロピレンシートで覆いをした。得られたそれぞれ１００個の鉛蓄電池について、極板群挿入後の抵抗溶接に際して生じたセル間接続の不良発生数を調べたところ、不良品は表１の通りゼロであった。比較例としてポリプロピレンシートでの覆いを行わなかったものの同数について同様の調べを行ったところ結果は表１の通りであった。
【００１８】
【表１】

Figure 0004073674
【００１９】
表１に示すように、本発明の製造方法による場合はいずれも不良品発生はゼロであったが、覆いを用いない比較例の場合は極板群の圧迫度の値が高くなるに従って不良品発生が発生し、群圧迫度が１００kgf/dm2の場合は不良品が７０％の割合で発生していることが分かる。
【００２０】
【発明の効果】
以上の通り、この発明によると極板群を電槽内に高圧迫度で挿入しても活物質の粉が脱落して、これがセル間の貫通孔に付着して抵抗溶接の溶接不良を発生するのを防止出来るので、極板群の高圧迫度による長寿命が期待できるシール型鉛電池の製造が容易となるものである。
【図面の簡単な説明】
【図１】この発明の鉛蓄電池の製造方法で、電槽に極板群を挿入する状態を示す説明図である。
【図２】この発明の鉛蓄電池の製造方法で、電槽に極板群を挿入した後の状態を示す説明図である。
【図３】この発明の鉛蓄電池の他の製造方法を示したもので、電槽に極板群を挿入する状態を示す説明図である。
【図４】図４は図３の中仕切の一部を拡大して示した断面図である。
【符号の説明】
１…電槽、２…極板群、３…挿入用ガイド、４…中仕切り、５…セル室、６…ストラップ、７…立上がり部、８…貫通孔、１０…側板、１１…導入部、１３…ガイド部、１４…覆い、１５…上部、１６…切り欠き。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a lead-acid battery, particularly a sealed lead-acid battery.
[0002]
[Prior art]
Conventionally, a sealed lead-acid battery uses a battery case made of synthetic resin, and an electrode plate group is inserted into each cell room formed by partitioning the inside of the cell room. The rising parts of the straps of the electrode plate group are connected to each other by resistance welding through through holes provided in the cell chamber, and then the upper part of the battery case is covered, and this cover is heat sealed to the upper and middle parts around the battery case. The manufacture is performed by welding to the upper part of a partition.
[0003]
In the production of such lead-acid batteries, there has often been a problem that the end of the electrode plate group contacts the upper part of the battery case when the electrode plate group is inserted, and the paste of the electrode plate group drops off due to this contact. Therefore, it is common practice to insert an electrode plate group insertion guide into the upper portion of the cell chamber, insert the electrode plate group into the cell chamber through the insertion guide, and extract the insertion guide after inserting the electrode plate group.
[0004]
By the way, in this conventional method for producing a lead-acid battery, when cells are connected to each other at the rising ends of the straps of the electrode plates by resistance welding, connection failure due to arc generation may occur. In particular, when the degree of compression after insertion of the electrode plate group is 50 kgf / dm 2 or more, it is recognized that more defective connections occur.
[0005]
When investigating this, when the electrode plate group was inserted into the cell of the battery case, the electrode plate located on the outermost side rubbed against the partition wall of the cell of the battery case, and the powder of the active material fell off. It has been found that it adheres to the inside of the portion of the through hole provided to prevent the resistance welding. In particular, in order to extend the life of sealed batteries, attempts have been made to increase the compression strength of the electrode plate group to 50 kgf / dm 2 or more. However, in this case, the electrode plate group is strongly rubbed against the cell partition wall. As a result, the amount of active material generated was increased, and as a result, the amount of powder adhering to the inside of the through-holes provided between the cells was large, and resistance welding was significantly hindered.
[0006]
[Problems to be solved by the invention]
This invention covers the part of the through hole provided in the partition wall of the battery case, and when the electrode plate group is inserted into the cell of the battery case, the electrode plate group comes into contact with the partition wall of the battery case. Even if a part of the active material falls off, it adheres in the through-holes between the cells, prevents resistance welding, and prevents the connection between the cells from being defective.
[0007]
[Means for Solving the Problems]
In the present invention, when the electrode plate group is inserted into the battery case, the pair of side plates expands in a tapered shape and faces each other , and the pair of side plates that are connected to the lower end of the introduction portion face each other in parallel. The battery case is provided with a guide for inserting an electrode plate group composed of a guide portion to be
Cover the side plate of this insertion guide closely and provide a cover , and then cover and close the through hole of the partition inside the battery case provided for connecting cells by resistance welding method , and then the electrode plate group The lead-acid battery manufacturing method (Claim 1) is characterized in that the cover is removed after insertion, and then connection between cells is performed by resistance welding. The lead storage battery according to claim 1, wherein the lead storage battery also serves as a guide (claim 2), and the degree of compression of the electrode plate group is 50 kgf / dm 2 or more. This is a manufacturing method (claim 3).
[0008]
[Action]
According to this invention, when the electrode plate group is inserted, the penetration portion of the active material can be prevented from entering and adhering to the through-hole portion by covering the portion of the through-hole for cell-to-cell connection. be able to. In addition, this cover also serves as a guide for inserting the electrode plate group and has a function of smoothing the insertion of the electrode plate group. From this point as well, resistance generation of the resistance welding is suppressed by suppressing generation of powder due to falling off of the active material. Increases reliability. Furthermore, this cover also has an effect of preventing the heat sheet from being defective due to the adhesion of the active material powder at the upper end of the battery case partition wall.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS.
[0010]
FIG. 1 shows a battery case 1 and an electrode plate group 2 which are main members of a storage battery, and an electrode plate group insertion guide 3 used when the electrode plate group 2 is inserted into the battery case 1. . The battery case 1 is formed of a synthetic resin and is partitioned into a plurality of cell chambers 5 by a plurality of partition walls 4 arranged in parallel inside.
[0011]
The electrode plate group 2 inserted into the cell chamber 5 is formed by alternately laminating a plurality of positive electrode plates, negative electrode plates, and separators, and each of the ears of each positive electrode plate and each negative electrode plate. The ears are connected to each other by a strap 6, and a rising portion 7 for inter-cell connection is formed on the upper surface of the end of the strap 6. In the figure, only one strap 6 and the rising portion 7 are shown. On the upper part of the partition 4 of the battery case 1, a rising part 7 of the strap 6 in one electrode plate group 2 accommodated in the adjacent cell chamber 5 and a rising part of the strap in the other electrode plate group (not shown) are provided. A through-hole 8 for connection between cells for connection by resistance welding is formed.
[0012]
The insertion guide 3 of the electrode plate group 2 has a pair of side plates 10 facing each other in a tapered shape and a pair of side plates 10 connected to the lower end of the introduction portion 11 so as to be parallel to each other. It comprises a guide part 13.
[0013]
Further, the cover 14 is provided in close contact with the side plate 10 so as to close the through holes 8, 8 in the upper part of the partitions 4, 4. The upper end of the cover 14 is the same as the upper end of the side plate 10 constituting the introduction portion 11 of the insertion guide 3, and the lower end covers the through hole 8 of the partition 4 provided at the lower end of the guide portion 13 of the side plate 10. To reach the bottom. The cover 14 here is, for example, a polypropylene sheet and has a thickness of 0.5 mm. If this cover is bonded in advance to the insertion guide 3, the insertion guide 3 is inserted into the upper part of the cell chamber 5 and at the same time, the through hole 8 is covered.
[0014]
After this, the electrode plate group 2 is inserted through the guide portion 13 from the introduction portion 11 of the insertion guide 3 as shown in FIG. FIG. 2 shows a state in which the electrode plate group 2 is inserted into the cell chamber 5. When the electrode plate group 2 is inserted into the cell chamber 5 of the battery case 1 using the guide portion 13 in this state, the electrode plate group contacts the partition wall of the battery case and is attached to the electrode plate when the electrode plate group is inserted. Even if a part of the active material falls off, it can be prevented that the active material adheres in the through holes between the cells. After the electrode group 2 is inserted, the insertion guide 3 is removed.
[0015]
In such a process, the electrode plate group 2 is sequentially inserted and accommodated in each cell chamber 5 of the battery case 1. After accommodating the electrode plate group 2 in each cell chamber 5, the inter-cell connections are made by welding the rising portions 7 of the straps 6 of the electrode plate group 2 in the adjacent cell chambers 5 through the through holes 8. Thereafter, a lid (not shown) is fitted on the upper part of the battery case 1, and this lid is welded to the upper part of the peripheral wall of the battery case 1 and the upper part of the partition 4 by heat sealing.
[0016]
It should be noted that the guide 3 for inserting the electrode plate group 2 that is conventionally used for inserting the electrode plate group may be pressed against the surface of the cell partition 4 when the electrode plate group is inserted, making it difficult to remove after inserting the electrode plate group. It was. In order to avoid this, as shown in FIG. 3, it has been proposed to provide notches 16 for escape clearance for inserting electrode plate groups on both sides of the upper part 15 of the partition 4 of the cell chamber (Japanese Patent Application No. Hei. 11-230675). Even in this case, the cover 14 can be used in the same manner as shown in FIG. FIG. 4 is an enlarged view of a part of the partition 4 in FIG. However, as shown in the figure, even in this case, the cutout portion 16 is provided up to the upper position so as not to reach the through hole 8.
[0017]
【Example】
As shown in Table 1, a 12V sealed lead-acid battery was manufactured by a known method while varying the degree of electrode group compression. At this time, when the electrode plate group was inserted, the through-hole portion for connection between cells was covered with a 0.5 mm polypropylene sheet as shown in FIG. For each of the 100 lead storage batteries obtained, the number of defective connections between cells that occurred during resistance welding after insertion of the electrode plate group was examined. The number of defective products was zero as shown in Table 1. As a comparative example, the same number of samples that were not covered with a polypropylene sheet was examined and the results were as shown in Table 1.
[0018]
[Table 1]
Figure 0004073674
[0019]
As shown in Table 1, the occurrence of defective products was zero in all cases according to the production method of the present invention. However, in the case of the comparative example in which no cover was used, the defective product was increased as the pressure value of the electrode plate group increased. It can be seen that when the group compression degree is 100 kgf / dm 2 , defective products are generated at a rate of 70%.
[0020]
【The invention's effect】
As described above, according to the present invention, even when the electrode plate group is inserted into the battery case at a high pressure, the powder of the active material falls off, and this adheres to the through-holes between the cells and causes poor welding of resistance welding. Therefore, it is easy to manufacture a sealed lead battery that can be expected to have a long life due to the high pressure of the electrode plate group.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an explanatory view showing a state in which an electrode plate group is inserted into a battery case in the method for producing a lead-acid battery according to the present invention.
FIG. 2 is an explanatory view showing a state after an electrode plate group is inserted into a battery case in the method for producing a lead-acid battery according to the present invention.
FIG. 3 shows another method for manufacturing the lead storage battery of the present invention, and is an explanatory view showing a state in which an electrode plate group is inserted into a battery case.
4 is an enlarged cross-sectional view of a part of the partition shown in FIG. 3;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Battery case, 2 ... Electrode board group, 3 ... Insertion guide, 4 ... Partition, 5 ... Cell chamber, 6 ... Strap, 7 ... Rising part, 8 ... Through-hole, 10 ... Side plate, 11 ... Introduction part, 13 ... guide part, 14 ... cover, 15 ... upper part, 16 ... notch.

Claims (3)

電槽に極板群を挿入する際に、一対の側板が互いにテーパ状に拡がって対向する導入部と、この導入部の下端に連なって一対の側板が互いに平行を保って対向するガイド部とからなる極板群の挿入用ガイドを電槽に設け、
この挿入用ガイドの側板に密着して覆いを設け、この覆いで抵抗溶接法によるセル間接続をするために設けた電槽内の中仕切りの貫通孔を予め覆って塞ぎ、その後極板群を挿入してから前記覆いを取除き、次いで抵抗溶接法によりセル間接続を行うことを特徴とする鉛蓄電池の製造方法。When the electrode plate group is inserted into the battery case, the pair of side plates expands in a taper shape and faces each other, and the guide portion that continues to the lower end of the introduction portion and faces the pair of side plates in parallel with each other. An electrode plate group insertion guide consisting of
Cover the side plate of this insertion guide closely and provide a cover , and then cover and close the through hole of the partition inside the battery case provided for connecting cells by resistance welding method , and then the electrode plate group A method for producing a lead-acid battery, wherein the cover is removed after insertion, and then connection between cells is performed by resistance welding. 前記貫通孔の部分の覆いが極板群挿入時のガイドを兼ねることを特徴とする請求項１記載の鉛蓄電池の製造方法。The lead-acid battery manufacturing method according to claim 1, wherein the cover of the through-hole portion also serves as a guide when the electrode plate group is inserted. 極板群の圧迫度を５０kgf/dm2以上とすることを特徴とする請求項１記載の鉛蓄電池の製造方法。 2. The method for producing a lead-acid battery according to claim 1, wherein the degree of compression of the electrode plate group is 50 kgf / dm 2 or more.
JP2002020382A 2002-01-29 2002-01-29 Method for producing lead-acid battery Expired - Lifetime JP4073674B2 (en)

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