JPH113714A - Continuous casting grid body for lead-acid battery and lead-acid battery equipped with grid body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a continuous casting grid body for lead-acid battery having little paste falling-off, and a lead-acid battery using the identical body having stable performance and a long life. SOLUTION: A vertical linear portion inner rib slit draft in the engraving of a drum molding plural vertical linear portion inner ribs 810 of a grid body is set to be 15 deg. or less. Small protrusion portions 11 are provided on the plural vertical linear portion inner ribs or lateral linear portion ribs of the gird body. The protrusion portions 11 protrude inwardly in squares surrounded by the vertical linear potion inner ribs 810 and lateral linear portion ribs 820. Protrusion portion slit draft in the engraving of a drum molding the protrusion portions 8 is set to be 15 deg. or less. Both can be used concurrently. These grid bodies are used in a lead-acid battery.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inexpensive and stable quality continuous casting grid for a lead-acid battery.

[0002]

2. Description of the Related Art In recent years, a continuous casting method has been put into practical use as a method of producing a lattice body having a high degree of freedom in lattice design and good productivity. As shown in FIG. 5, this method comprises a rotating cylindrical mold (drum) having a grid pattern engraved on the outer peripheral surface thereof and a nozzle for continuously pouring a lead alloy melt into the engraving. A belt-shaped lattice is taken out by solidifying the molten alloy with a mold and peeling it off. In addition, the belt-shaped lattice becomes individual lattices by cutting. This continuous casting method can produce a grid at a casting speed of, for example, about 30 m / min, and is excellent in productivity, but is not without problems in terms of quality of the produced grid.

That is, a lead alloy melt shown in Japanese Patent Publication No. 58-37057 is supplied to a carved portion 3 of an outer peripheral surface 2 of a drum 1 by a nozzle 4 and solidified to obtain a molten metal (a band-like lattice body 5A). ) Is peeled off and cut individually, and the cross section of the formed lattice body 5B (FIG. 6 (1)) has a substantially triangular or trapezoidal shape as shown in FIG. 6 (2). In FIG. 6, reference numeral 6 denotes a current collecting ear, 7 denotes a vertical frame bone, 81 denotes a vertical linear portion inner bone, 82 denotes a horizontal linear portion inner bone, and 9 denotes a horizontal frame bone. This shape makes it easier for the filled paste to fall off than the conventional book mold type grid in terms of retaining the active material (paste), which is one of the functions required for the grid of the lead-acid battery. It is easily expected that the characteristics of the lead-acid battery provided with the lattice will deteriorate. When the paste is filled in the lattice body 5B shown in FIG. 6B, a part of the surface of the inner bone 81 is not covered with the paste 10 as shown in FIG. Easy to come off.

[0004]

As described above, in the technique of the conventional continuous grid for a lead-acid battery, the paste easily falls off the grid. Such a point is a problem to be solved by the present invention.

In a continuous casting method of a grid for a lead storage battery as shown in FIG. 5, a so-called one-sided tapered shape (generally a drum frame) having a substantially triangular or trapezoidal cross section as shown in FIG. The draft of the bone groove and internal bone groove is 3
(From 0 ° to 45 °) is an essential part of the present casting method and cannot be avoided. However, as one method for preventing the paste from falling off from the lattice having such a cross-sectional shape, there is the following method. For example, the paste is filled from below the lattice section shown in FIG. 6 (2). In other words, as shown in FIG. 7 (2), the effect of filling the paste from the lower part of the lattice body cross section is that the inner bone is generally thinner than the frame bone, so the inner bone 81 is formed by pressing the paste. Is pressed upward to some extent, and the paste 10 is present so as to surround the inner bone 81, so that the paste is less likely to fall off. Although the above-mentioned problem is solved to some extent by this method, the amount of deformation due to the pressing of the inner bone is not uniform due to changes in pressure or the like at the time of filling the paste, and it is difficult to quantitatively control the amount of deformation. is there.

[0006]

Therefore, according to the present invention, a draft angle of a bone groove in the vertical straight portion in the engraving of the drum for forming a plurality of vertical straight portion internal bones 810 of the lattice body 5 shown in FIGS. Is reduced to 15 ° or less. In addition, small projections 11 are provided on a plurality of vertical straight portion internal bones or horizontal straight portion internal bones of the lattice body shown in FIG. The protrusion 11 protrudes toward the inside of the box surrounded by the vertical straight portion inner bone 810 and the horizontal straight portion inner bone 820. Also, the draft of the protrusion groove in the engraving of the drum for forming the protrusion 11 is reduced to 15 ° or less. Further, by using both of them, the above-mentioned problem is solved.

[0007] By setting the draft angle of the vertical internal bone groove in the drum for molding the vertical straight portion internal bone 810 to 15 ° or less, the following operation and effect are produced. This is because, when the lattice body 5 is peeled off from the drum, the release of the vertical linear portion inner bone 810 is delayed more than the horizontal linear portion inner bone 820, and the internal bone deforms, and the state of the lattice body cross section is as shown in FIG. The vertical straight portion internal bone 810 and the horizontal straight portion internal bone 820 are arranged so as to spread in the thickness direction of the lattice body 5. That is, it is in a meandering state. When the grid body is filled with the paste, as shown in FIG.
0 becomes three-dimensionally connected to each other, and the retention of the paste itself increases. In order to delay the release of the vertical straight portion internal bone 810, the lower the draft angle of the vertical straight portion internal bone groove, the more advantageous. Theoretically, aliphatic hydrocarbons and the like are often used as a release agent to the drum for release, but the solidification shrinkage of the molten lead alloy always occurs, although it depends on the applied amount. Thus, it is possible to release the mold to a draft angle of 0 degree. The draft angle is
When the angle exceeds 15 °, it becomes difficult to meander as described above.

[0008]

Next, an embodiment of the present invention will be described. 1 and 2 show the shape of the lead-acid battery grid body 5 according to the present invention. The outer diameter of the drum is 413 mm, the width is 220 mm, and the material is FCD400. Using this, Pb-1.5%
Sb-0.25% As-0.02% Se alloy was melted at a temperature of 4
80 ° C, drum surface temperature 180 ° C, drum rotation speed 30
A grid was cast under the conditions of m / min and a release agent application amount of 1 dm ³ / h to obtain a desired grid (Example 1). Further, the lattice body shown in FIG. 3 was cast under the same conditions as above. The cross-sectional shape of the grating body other than the protrusions is the same as that shown in FIG. 2 (Example 2). Further, a lattice body provided with the protrusions shown in FIGS. 3 (2) and (3) and having a draft angle of 30 ° for all the internal bone grooves of the drum forming the internal bone of the lattice body was cast in the same manner as described above ( Example 3). On the other hand, as a conventional lattice body, a lattice body having an internal bone groove of a drum forming an inner bone with a draft of 30 degrees and having no protrusion was cast as a comparison in the same manner as the above condition (Comparative Example 1). After that, these lattices were filled with paste and the state of the paste falling off was examined. As a result, the following results were obtained. The rate of occurrence of falling off of the paste (the ratio of the number of electrode plates having holes when 20,000 grids were filled with the paste) was 0.05% in the grid according to the present invention (Example 1). , 0.03% (Example 2),
0.07% (Example 3), but 1.5% with the conventional product
% (Comparative Example 1). The life characteristics of a battery using the lead-acid battery grid according to the present invention as a positive grid are described in JI.
As a result of the S heavy load life test, all the lead-acid batteries according to the present invention had a life characteristic of 350 cycles (31 in the conventional product).
0 cycle), indicating that the falling off of the active material was smaller than that of the conventional product. In addition, FIG.
The dimensions of the numerals shown in FIGS. 3 (2) and (3) are mm.

[0009]

As described above, the continuous casting grid for a lead-acid battery according to the present invention has less active material falling off from the grid compared to the conventional product and has a more stable quality. The battery has a great industrial value such as a stable and long life.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a grid structure of a lead storage battery according to the present invention.

FIG. 2 shows each section of FIG. 1, wherein (1) is DD
Cross section, (2) is EE cross section, (3) is FF cross section,
(4) is GG section, (5) is HH section, (6) is I section.
It is explanatory drawing of the -I cross section.

FIG. 3 is a lead-acid battery grid according to the present invention, wherein (1) is a front view, (2) is an enlarged J portion of (1), and (3) is a K- of (2).
It is explanatory drawing of a K cross section.

FIG. 4 is a diagram showing a lead-acid battery lattice according to the present invention, wherein (1) is an enlarged cross-section and (2) is an explanatory view of the paste-filled state of (1).

FIG. 5 is an explanatory view of a method of manufacturing a continuous cast lattice body for a lead storage battery, wherein (1) is a front view and (2) is a side view of (1).

6 (a) and 6 (b) are explanatory views of a cross section taken along the line AA of FIG. 6 (1), showing a conventional lead-acid battery grid body.

FIGS. 7A and 7B are enlarged cross-sectional views and FIG. 7B is a modified view of FIG.

[Explanation of symbols]

1: drum, 2: outer peripheral surface, 3: engraving, 4: nozzle, 5: lattice, 6: collecting ear, 70: vertical frame bone, 81
0: vertical straight section inner bone, 820: horizontal straight section inner bone, 90: horizontal frame bone, 10: paste, 11: protrusion

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroki Tsuji 2-8-7 Nihonbashi Honcho, Chuo-ku, Tokyo Inside Shin-Kobe Electric Co., Ltd. (72) Akira Nagata 2-87 Nihonbashi Honcho, Chuo-ku, Tokyo Shin Kobe Electric Co., Ltd.

Claims (4)

[Claims] 1. A rotating cylindrical mold provided on a surface of a rotating cylindrical mold.
The lead alloy melt is continuously supplied to the engraving that matches the lattice pattern, and after solidifying it, the continuous lattice for a lead-acid battery obtained by stripping off the completed lattice from the engraving, The engraving is composed of a frame bone groove having an ear for current collection, a plurality of vertical straight lines presenting a substantially vertical direction, and a plurality of horizontal straight lines intersecting therewith. The bone groove is parallel to the rotation axis of the cylindrical mold, and at least a part of a draft angle thereof is equal to or less than 15 degrees. By peeling the completed lattice body from the engraving of the mold, the inner bone of the lattice body is removed. A continuous cast grid for a lead-acid battery formed by meandering in the thickness direction of the grid. 2. A plurality of vertical straight portions exhibiting a substantially vertical direction and internal bone grooves of a plurality of horizontal straight portions intersecting with the vertical straight portions constitute a grid pattern of a lattice body, and are drawn into the grid. 2. The continuous casting grid body for a lead-acid battery according to claim 1, wherein a projection groove having a gradient of 15 degrees or less is formed. 3. A rotating cylindrical mold provided on a surface of a rotating cylindrical mold.
The lead alloy melt is continuously supplied to the engraving that matches the lattice pattern, and after solidifying it, the continuous lattice for a lead-acid battery obtained by stripping off the completed lattice from the engraving, The engraving is composed of a frame bone groove having an ear for current collection, a plurality of vertical straight lines presenting a substantially vertical direction, and a plurality of horizontal straight lines intersecting with the inner bone groove. Protrusion grooves having a draft angle of 15 degrees or less are formed toward the inside of the box, and the internal grooves of the plurality of vertical straight portions are formed by rotating the cylindrical mold. A continuous cast lattice for a lead-acid battery, wherein the lattice is parallel to the axis and the inner bone of the lattice is meandering in the thickness direction of the lattice by peeling the completed lattice from the engraving of the mold. 4. A lead-acid battery provided with the grid according to claim 1.