JP4006888B2 - Manufacturing method of lead acid battery - Google Patents
Manufacturing method of lead acid battery Download PDFInfo
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- JP4006888B2 JP4006888B2 JP15907399A JP15907399A JP4006888B2 JP 4006888 B2 JP4006888 B2 JP 4006888B2 JP 15907399 A JP15907399 A JP 15907399A JP 15907399 A JP15907399 A JP 15907399A JP 4006888 B2 JP4006888 B2 JP 4006888B2
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- lead
- width
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- manufacturing
- acid battery
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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、鉛蓄電池、特にその格子体の製造法に関するものである。
【0002】
【従来の技術】
近年、鉛蓄電池の生産性向上を目的として、その格子体の製造法として、鉛合金シートをエキスパンド加工し、連続的にスリットを形成させるエキスパンド加工が広く用いられるようになってきた。このエキスパンド加工法には、そのスリット形成方法によってレシプロ方式と、ロータリー方式に大別される。生産速度の向上及び格子目の微細化を両立するためには、レシプロ方式よりロータリー方式が有利である。
【0003】
【発明が解決しようとする課題】
ロータリー方式によるエキスパンド加工法を用いて格子体を製造した場合、鉛シートはまず互いに平行な複数条のスリットを千鳥状に形成されると同時に、このスリットにより形成される線状部が、鉛シートの表裏両方向に交互に凸状に塑性変形される。このスリットが形成された鉛シートを展開することにより網目部を形成する。しかし、スリットにより形成される線状部が、鉛シートの表裏両方向に交互に凸状に塑性変形され、これを展開して網目部とするため、格子の骨部がねじれてしまい、結節部におけるクラックの発生や応力腐食がおこりやすく、鉛蓄電池の寿命低下の原因となっていた。
【0004】
本発明は上記課題を解決するものであり、ロータリー方式で製造されたエキスパンド格子を用いることにより、生産性が向上し、かつ寿命特性が低下しない鉛蓄電池を提供することを目的とする。
【0005】
【課題を解決するための手段】
本発明は上記目的を達成するために、互いに平行な複数条のスリットを断続的に鉛シートの長手方向に沿って千鳥状になるよう形成するとともに、互いに平行に隣接しあうスリットにより形成される線状部を鉛合金シート面から表裏両方向に交互に凸状に突出するよう塑性変形させた後、この鉛合金シートを展開することにより形成した網目部を格子体として用いる鉛蓄電池の製造方法において、錫を0.6〜2.0重量%含む鉛合金からなる鉛シートに形成されたスリット部の幅aと網目部として展開した幅bとの関係を、bをaの4〜6倍にするものである。
【0006】
【発明の実施の形態】
ロータリー方式でエキスパンド格子を製造する場合、スリットを形成すると同時に互いにとなり合う線状部を交互に表裏面へ凸状部を形成する、いわゆる予備形成を行い、これを平面に展開するため網目部の骨にねじれが発生するため、展開幅が大きすぎるとねじれにより骨が大きく伸張しなければならず、また、結節部にも無理な力がかかってしまう。しかし、本発明の構成によれば、骨が無理に伸張されることなくしたがって、格子体としての強度を維持することができ、また、結節部にも無理な力がかかることなく、クラックが入ることがない。
【0007】
一方、展開幅が小さすぎると、極板にしめる骨の体積が、活物質がしめる体積と比較して、相対的に大きくなるため、鉛蓄電池の容量を大きく保つとともに、寿命特性を長くすることができるものである。
【0008】
また、格子体の腐食量・強度については、鉛合金シートの物性とも関係がある。格子体の耐腐食性・機械的強度が向上することにより寿命特性が向上する反面、反対に強度が増加することにより、製造工程における塑性変形によるクラックが生じ、錫を添加することによる寿命向上効果が損なわれることがあった。よって、鉛シート合金が錫を0.6〜2.0重量%含有する場合であれば、ロータリ方式によるエキスパンド加工の際のねじれと鉛合金自体の強度とがバランスすることにより、鉛蓄電池の寿命特性向上効果を顕著に得ることができる。
【0009】
【実施例】
(実施例1)
Pb−0.06wt%Ca−2.0wt%Snからなる鋳造板(15mm)をそれぞれ冷間圧延し、厚さ1.0mmとした合金シートを使用した。これに、図1に示すごとくスリットを入れ予備形成した。この合金シートを図2に示すごとく展開した。図1におけるスリット形成部の幅(a)と展開した後の網目部の幅(b)との比率を変化させることにより、表1に示すような7種類の格子を製造した。これらのそれぞれの格子において、網目部の結節部におけるクラック発生率を顕微鏡で観察し、その結果も併せて表1に示す。
【0010】
【表1】
【0011】
表1に示した結果から、(網目部の幅)/(スリット形成部の幅)の割合が6以下ならクラックの発生を抑制できることが確認された。
【0012】
次に、表1に示した格子に鉛粉を水及び希硫酸で混練したペーストを充填し、熟成乾燥して正極板とした。これら正極板を負極板およびセパレータと組み合わせて自動車用の鉛蓄電池(55D23型)を作成した。これらの電池についてJIS規格(D5301)で規定される軽負荷寿命試験を雰囲気温度75℃の気相中で実施した。表2にその結果を示す。なお、寿命試験結果は電池Aの寿命を100とした時の指数で表記した。
【0013】
【表2】
【0014】
表2より、格子C、D、Eを用いた電池、すなわち格子製造の際の網目部の幅がスリット形成部の幅の4〜6倍になっている電池は、良好な寿命特性を示していることがわかる。電池A,Bで寿命特性が悪いのは、展開幅が切り込み幅に対して2〜3倍しかないために、極板中に占める格子体積が非常に大きくなり、活物質を十分に充填できないことによるものと思われる。また、電池F、Gに関しては、格子F、Gの結節部に発生したクラックの影響が出ているものと思われる。
【0015】
【表3】
【0016】
一方、上記と同様の試験を、錫添加量を変化させた鉛合金シートを用い、展開幅を切り込み幅の4倍、5倍で製造した格子を用いた電池で行った。その結果を表3に示す。表3より錫濃度は0.6〜2.0wt%が適当であることがわかった。電池H、Iでは、錫の含有量が少なすぎるために格子腐食が起こり、電池P、Qでは強度が強すぎるために、逆にクラック発生につながり、寿命の低下にいたったものと考えられる。
【0017】
【発明の効果】
以上のように本発明によれば、生産性に優れたロータリー方式によるエキスパンド格子を製造するときに、スリット形成幅とこれを展開した後の網目状部の幅との比率を4〜6とすることにより、鉛蓄電池としての寿命特性の低下を抑制することが可能となる。
【図面の簡単な説明】
【図1】一般的な展開前の鉛シートの図
【図2】一般的な展開後のエキスパンド格子体の図[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lead-acid battery, and more particularly to a method for manufacturing the lattice body thereof.
[0002]
[Prior art]
In recent years, for the purpose of improving the productivity of lead-acid batteries, as a method for manufacturing the lattice body, an expanding process in which a lead alloy sheet is expanded and a slit is continuously formed has been widely used. This expanding method is roughly classified into a reciprocating method and a rotary method according to the slit forming method. The rotary method is more advantageous than the reciprocating method in order to achieve both improvement in production speed and finer lattice.
[0003]
[Problems to be solved by the invention]
When the grid is manufactured using the rotary process, the lead sheet is first formed with a plurality of parallel slits in a staggered pattern, and at the same time, the linear portion formed by the slits is a lead sheet. The plastic deformation is alternately convex in both the front and back directions. A mesh portion is formed by developing the lead sheet on which the slits are formed. However, the linear portion formed by the slit is plastically deformed in a convex shape alternately in both the front and back directions of the lead sheet, and this is expanded to form a mesh portion. Cracks and stress corrosion are likely to occur, causing a decrease in the life of the lead-acid battery.
[0004]
The present invention solves the above-described problems, and an object of the present invention is to provide a lead storage battery in which productivity is improved and life characteristics are not deteriorated by using an expanded lattice manufactured by a rotary method.
[0005]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention forms a plurality of slits parallel to each other in a staggered manner along the longitudinal direction of the lead sheet, and is formed by slits adjacent to each other in parallel. In a method of manufacturing a lead storage battery using a mesh portion formed by unfolding the lead alloy sheet after plastic deformation so that the linear portion protrudes alternately from the lead alloy sheet surface in both front and back directions. The relationship between the width a of the slit part formed on the lead sheet made of a lead alloy containing 0.6 to 2.0% by weight of tin and the width b developed as a mesh part is set to 4 to 6 times b. To do.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
In the case of manufacturing an expanded lattice by a rotary method, a so-called preliminary formation is performed by alternately forming linear portions that are mutually adjacent at the same time as slits are formed on the front and back surfaces, and in order to develop this on a plane, Since the bone is twisted, if the deployment width is too large, the bone must be greatly stretched due to the twist, and an unreasonable force is also applied to the nodule. However, according to the configuration of the present invention, the bone is not stretched excessively, so that the strength as the lattice body can be maintained, and a crack is generated without applying an excessive force to the knot portion. There is nothing.
[0007]
On the other hand, if the spread width is too small, the volume of the bone that is made into the electrode plate is relatively larger than the volume that the active material is made, so that the capacity of the lead storage battery can be kept large and the life characteristics can be lengthened. It can be done.
[0008]
Further, the corrosion amount / strength of the lattice body is also related to the physical properties of the lead alloy sheet. The life characteristics are improved by improving the corrosion resistance and mechanical strength of the grid, but on the contrary, the increase in strength causes cracks due to plastic deformation in the manufacturing process, and the effect of improving the life by adding tin. May be damaged. Therefore, if the lead sheet alloy contains 0.6 to 2.0% by weight of tin, the life of the lead storage battery is obtained by balancing the twist in the rotary processing with the strength of the lead alloy itself. A characteristic improvement effect can be remarkably obtained.
[0009]
【Example】
Example 1
Cast sheets (15 mm) made of Pb-0.06 wt% Ca-2.0 wt% Sn were each cold-rolled to use an alloy sheet having a thickness of 1.0 mm. A slit was preliminarily formed in this as shown in FIG. This alloy sheet was developed as shown in FIG. By changing the ratio between the width (a) of the slit forming portion in FIG. 1 and the width (b) of the mesh portion after development, seven types of lattices as shown in Table 1 were manufactured. In each of these lattices, the crack occurrence rate at the knot portion of the mesh portion was observed with a microscope, and the results are also shown in Table 1.
[0010]
[Table 1]
[0011]
From the results shown in Table 1, it was confirmed that the generation of cracks can be suppressed if the ratio of (width of mesh portion) / (width of slit forming portion) is 6 or less.
[0012]
Next, the grid shown in Table 1 was filled with a paste obtained by kneading lead powder with water and dilute sulfuric acid, and aged and dried to obtain a positive electrode plate. These positive electrode plates were combined with a negative electrode plate and a separator to prepare a lead storage battery (55D23 type) for automobiles. These batteries were subjected to a light load life test defined by JIS standard (D5301) in a gas phase at an ambient temperature of 75 ° C. Table 2 shows the results. The life test result was expressed as an index when the life of the battery A was taken as 100.
[0013]
[Table 2]
[0014]
From Table 2, a battery using the grids C, D, and E, that is, a battery in which the width of the mesh part at the time of manufacturing the grid is 4 to 6 times the width of the slit forming part shows good life characteristics. I understand that. Battery A and B have poor life characteristics because the unfolded width is only 2 to 3 times the cut width, so the lattice volume in the electrode plate becomes very large and the active material cannot be filled sufficiently. It seems to be due to. Moreover, regarding the batteries F and G, it seems that the influence of the crack which generate | occur | produced in the nodal part of the grating | lattices F and G has come out.
[0015]
[Table 3]
[0016]
On the other hand, a test similar to the above was performed on a battery using a lead alloy sheet in which the amount of tin added was changed, and a grid manufactured with a developed width of 4 times or 5 times the cut width. The results are shown in Table 3. From Table 3, it was found that an appropriate tin concentration was 0.6 to 2.0 wt%. In batteries H and I, the tin content was too small, so that lattice corrosion occurred, and in batteries P and Q, the strength was too strong.
[0017]
【The invention's effect】
As described above, according to the present invention, when manufacturing an expanded lattice by a rotary method having excellent productivity, the ratio of the slit formation width to the width of the mesh portion after the expansion is 4 to 6. By this, it becomes possible to suppress the fall of the lifetime characteristic as a lead storage battery.
[Brief description of the drawings]
FIG. 1 is a diagram of a lead sheet before general deployment. FIG. 2 is a diagram of an expanded lattice after general deployment.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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JP15907399A JP4006888B2 (en) | 1999-06-07 | 1999-06-07 | Manufacturing method of lead acid battery |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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JP15907399A JP4006888B2 (en) | 1999-06-07 | 1999-06-07 | Manufacturing method of lead acid battery |
Publications (2)
Publication Number | Publication Date |
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JP2000348735A JP2000348735A (en) | 2000-12-15 |
JP4006888B2 true JP4006888B2 (en) | 2007-11-14 |
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JP15907399A Expired - Lifetime JP4006888B2 (en) | 1999-06-07 | 1999-06-07 | Manufacturing method of lead acid battery |
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Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2391043C (en) | 2001-06-22 | 2012-01-03 | Japan Storage Battery Co., Ltd. | Grid for a battery plate, method of producing the same, and battery using the same |
JP2003007307A (en) * | 2001-06-22 | 2003-01-10 | Japan Storage Battery Co Ltd | Manufacturing method of grid for storage battery |
JP4691962B2 (en) * | 2004-11-12 | 2011-06-01 | パナソニック株式会社 | Lead acid battery |
-
1999
- 1999-06-07 JP JP15907399A patent/JP4006888B2/en not_active Expired - Lifetime
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