JP2001093530A - Lattice for lead storage battery and storage battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable lattice for a lead storage battery with small deformation. SOLUTION: A gradient 8 having angle θ is formed at a side end of a drum forward direction of a sideward frame 5, thickening more toward the end to be the same as that of a lengthwise edge frame 2 at a point of crossing with a lengthwise edge frame 4 to the side of drum forward direction. The lengthwise edge frame 2 is pepled off from the drum by the force transferred from the crosswise frame 5 in a continuous manner to lessen the deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grid for a lead-acid battery and a lead-acid battery, and more particularly to a grid for a lead-acid battery in which molten metal is continuously supplied to the surface of a rotating cylindrical mold and molten metal is solidified. The present invention relates to a lead-acid battery grid body including a frame bone having ears for current collection and a grid-shaped inner bone thinner than the frame bone, and a lead-acid battery including the lead-acid battery grid body.

[0002]

2. Description of the Related Art In recent years, as a method for producing a lattice body having a high degree of freedom in lattice design and good productivity, for example, a continuous casting method as disclosed in Japanese Patent Publication No. 58-37057 has been put to practical use. The stage has been reached. In general, as shown in FIG. 5A, the grid for a lead-acid battery includes a plurality of vertical inner bones 6 exhibiting a direction substantially perpendicular to a frame bone 4 having an ear for current collection and a plurality of horizontal inner bones intersecting therewith. As shown in FIG. 5 (B), in order to reduce the weight of the lattice, the thickness t ₁ of the lateral inner bone 5 is changed to the thickness t _{2 of the} frame bone 4.
The shape is thinner (t ₁ <t ₂ ), and a step is formed.

In the continuous casting method, as shown in FIG. 6, a rotating drum (mold) 1 having a lattice shape engraved on an outer peripheral surface thereof.
2, the molten metal 1 is continuously fed from the nozzle 14 to the engraving portion 18.
The molten metal 1 poured into the engraving part 18
6 is conveyed by sandwiching the continuous casting lattice 24 between the surface of the drum 12 and the endless belt 22 having heat resistance while solidifying by supplying cooling water into the water cooling groove 20 and cooling the same.
The continuous cast lattice body 24 is taken out by pulling it with a predetermined tension in the lattice unwinding direction (the direction of arrow W). According to such a continuous casting method, it is possible to produce a lattice at a casting speed of, for example, about 30 m / min. Therefore, the productivity is lower than that of a conventional book molding method. It has the advantage of being superior.

[0004]

However, in the continuous casting method, when the lattice body is separated from the mold, the release of the bone in the vertical direction is delayed as compared with the bone in the horizontal direction, so that the bone is deformed. In particular, this deformation phenomenon is remarkably observed in the vertical frame bone, and when the vertical frame bone is deformed, the shape of the lattice body cannot be maintained, so that there is a problem that the quality of the lattice body cannot be maintained. .

[0005] That is, the mold release phenomenon in which the continuous casting grid is separated from the drum can be simply described as follows. As shown in FIG. 7, the continuous casting grid 24 is constantly pulled by the grid tension T, When the angle between the tangent of the drum 24 and the tangent of the drum 12 is α, the continuous casting grid 24
A peeling force Tsinα for peeling off is generated. At the peeling point P at which the peeling force Tsinα becomes the same as the binding force S for binding the drum 12 and the continuous casting grid body 24, the continuous casting grid 24 peels (releases) from the drum 12. Therefore, it can be said that the smaller the angle α is, the easier it is to peel the continuous cast lattice.

[0008] As shown in FIG. 8, a point a on the lateral inner bone 5 is
At the peeling point P shown in FIG. 7, the film is immediately peeled off from the drum 12. , Peels off with a delay. Note that, in FIG. 8, an arrow R indicates a flow of peeling (the same applies to FIG. 9).

[0007] As shown in FIG. 9, the mechanism by which the point A on the vertical frame 2 separates from the drum 12 is shown in FIG.
As shown in the figure, there is a step between the horizontal inner bone 5 and the frame bone 4,
It is separated from the drum 12 by the force transmitted from the lateral frame bone 3 instead of the force transmitted from the lateral inner bone 5. Therefore, point A
It is considered that the timing at which the lattice body is separated from the drum 12 is greatly delayed as compared with the point B, causing large deformation.

The present invention has been made in view of the above circumstances, and has as its object to provide a grid for a lead storage battery having a small deformation amount and a stable quality, and a lead storage battery provided with the grid.

[0009]

In order to achieve the above-mentioned object, the present invention relates to a grid for a lead-acid battery in which molten metal is continuously supplied to the engraving of the surface of a rotating cylindrical mold (drum) and solidified. In a lead-acid battery grid body comprising a frame bone having ears for current collection and a grid-shaped inner bone thinner than the frame bone, the inner bone is formed by a vertical frame bone on the drum traveling direction side. At the intersection, it has substantially the same thickness as the vertical frame bone, and has substantially the same thickness as the lattice-shaped inner bone toward the center of the lattice plane. In the present invention, the inner bone has substantially the same thickness as the vertical frame bone at the intersection with the vertical frame bone on the drum advancing direction side, and the inner bone has a substantially lattice-like shape toward the center of the lattice plane. Since they have the same thickness, the vertical frame bone on the drum traveling direction side is released from the cylindrical mold by the force transmitted directly from the inner bone. For this reason, it is possible to obtain a grid body for a lead-acid battery with a small amount of deformation upon release from the mold and a stable quality.

[0010] Further, even if the rounding or chamfering process is performed on the lattice surface side of the vertical frame bone on the drum traveling direction side instead of the inner bone, the vertical frame bone on the drum traveling direction side is separated from the inner bone. Since it is released from the cylindrical mold by the force transmitted directly,
It is possible to obtain a grid body for a lead-acid battery with a small amount of deformation upon release from the mold and a stable quality.

In the lead-acid battery provided with the above-described lead-acid battery grid, the amount of deformation at the time of release from the mold is small, so that an equal amount of active material can be applied to each grid. The storage battery capacity can be secured.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a lead storage battery to which the present invention is applied will be described.

(Construction) The lead storage battery of the present embodiment includes a rectangular battery case (not shown) that serves as a container for the lead storage battery. The battery case is excellent in terms of moldability and electrical insulation, for example,
The material is a polymer resin such as acrylic butadiene styrene (ABS). In the battery case, five positive electrode plates and six negative electrode plates are laminated via a separator made of a microporous polyethylene film. The positive electrode plate and the negative electrode plate are each manufactured by applying an active material to both surfaces of a lattice body cast by a continuous casting method.

The lattice body of the present embodiment has an outer diameter of 413 mm,
Using a cylindrical drum of 220 mm width and material FCD400 (granular graphite cast iron) (see FIG. 6), Pb-1.5% Sb
-0.25% As-0.02% Se alloy with a molten metal temperature of 48
0 ° C, casting surface temperature 180 ° C, mold rotation speed 30m
/ Min and a release agent application amount of 1 dm ³ / h.

As shown in FIG. 1A, the lattice body 10
It is composed of a frame bone 4 and an inner bone 7. The frame bone 4 is a vertical frame bone on the drum advancing direction side (a vertical frame bone near the ear 1 in FIG. 1A).
And a vertical frame bone 2 on the side of the lattice unwinding direction (a vertical frame bone on the opposite side to the ear 1 in FIG. 1A), and upper and lower horizontal frame bones 3. . Ears 1 for current collection are formed in the upper and lower vertical bones of the horizontal frame bones 3, and legs for holding the electrode plate in contact with a saddle formed in the lower part of the battery case are formed in the lower horizontal and vertical bones. A part 9 is formed. The inner bone 7 is composed of a plurality of substantially vertical inner bones 6 and a plurality of substantially horizontal transverse inner bones 5 which intersect vertically.
Consists of In addition, in the drawings after FIG. 1, the arrow W indicates the grid unwinding direction shown in FIG.

As shown in FIG. 1B, a gradient 8 having an angle θ is formed at the end of the lateral inner bone 5 on the drum traveling direction side, and gradually becomes thicker than the thickness of the central portion, and becomes closer to the drum traveling direction side. At the intersection with the vertical frame bone 2. Is in the range of 5 to 60 degrees, and preferably about 15 to 30 degrees. On the other hand, a step is formed at the end of the lateral inner bone 5 in the grid unwinding direction in order to reduce the weight of the grid body 10.

The ear 1 is connected to a positive electrode strap, and the positive electrode strap is connected to a positive external output terminal provided on the battery cover. Further, the positive electrode strap is held by a partition wall formed in the battery case. Note that the above structure is the same for the negative electrode plate arranged to rotate the positive electrode plate by 180 degrees.

In order to manufacture the lead-acid battery of this embodiment, the positive electrode plate and the negative electrode plate are alternately laminated with a separator interposed therebetween, and the positive electrode strap and the negative electrode strap are used to form the ear 1 of the positive electrode grid and the negative electrode grid. The ears 1 are connected and inserted into the battery case. A battery lid is attached to the upper part of the battery case by welding or bonding, and an electrolytic solution is poured into the battery case from a liquid inlet, thereby producing an unformed battery. After the unformed battery is formed at a predetermined constant voltage and constant current for a predetermined time, the liquid inlet is sealed with a liquid stopper to complete the lead storage battery. The electrolyte had a specific gravity of 1.22.
5 (20 ° C.) dilute sulfuric acid can be used.

(Measurement of Deformation) According to the above embodiment,
The lattice body 10 of the example in which the above-described angle θ was 30 degrees was cast by a continuous casting method. Further, in order to confirm the effect of the example, the lattice body shown in FIG. 5 was also cast under the same conditions. Then, the amounts of deformation in the thickness (t) direction, the vertical direction, and the horizontal direction were measured. Table 1 below shows the amounts of deformation (unit: mm) of the examples and the comparative examples.

[0020]

[Table 1]

As shown in Table 1, in the lattice body of the embodiment, a gradient of 30 degrees was formed at the end of the lateral inner bone 5 on the drum traveling direction side, so that the deformation amount was smaller than that of the lattice body of the comparative example. , Could be extremely small in all vertical and horizontal directions.

(Effects) According to this embodiment, the gradient of the angle θ is formed on the drum traveling direction side and there is no step between the horizontal inner bone 5 and the vertical frame bone 2, so that the conventional example shown in FIG. As shown in FIG. 2, the point A on the vertical frame bone 2 does not separate from the drum 12 with a delay due to the force transmitted from the horizontal frame bone 3, but is directly transmitted from the horizontal inner bone 5 as shown in FIG. 2. Peeled off from the drum 12 by a force. For this reason, the timing at which the lattice body is peeled off the drum 12 at the point A is slightly delayed as compared with the point B, so that the grid body is much easier to peel off from the drum 12 without causing a large deformation. Therefore, it is possible to obtain a grid body for a lead storage battery with a small amount of deformation of the grid body and a stable quality.

Since the lead-acid battery of this embodiment uses such a grid for a lead-acid battery, the amount of deformation is small, so that an equal amount of active material can be applied to each electrode plate. The capacity of the lead storage battery can be ensured according to the capacity, and the amount of deformation of each grid when forming the electrode plate group is small, so that the height of the strap can be made substantially uniform. Can be reduced in the number of adjustment steps when manufacturing the device.

In the above embodiment, a gradient is formed only for the inner bones near the frame bones. However, even when there is a difference in thickness between the inner bones, the same effect can be obtained. It goes without saying that you can do it.

In this embodiment, an example in which the gradient is formed in a straight line is shown. However, as shown in FIGS.
The cross-sectional shape may be a convex or concave curved shape. Further, in this embodiment, an example in which the gradient has the angle θ has been described. However, if the gradient is used instead of the gradient, the weight of the lattice body can be reduced. Further, in the present embodiment, an example is shown in which a gradient is formed in the horizontal inner bone. However, as shown in FIGS. The same effect can be obtained even if chamfering is performed.

Further, in this embodiment, the vertical and horizontal lattice-shaped inner bones have been described. However, as shown in FIGS. 4A and 4B, a lattice having an inner bone with a diagonally straight portion or a diagonally curved portion is used. Similar effects can be obtained in the body. In addition,
4A and 4B, the inner bone near the vertical frame bone 2 on the drum traveling direction side of the lattice body is tapered as indicated by oblique lines.

[0027]

As described above, according to the present invention,
The inner bone has substantially the same thickness as the vertical frame bone at the intersection with the vertical frame bone on the drum advancing direction side, and has substantially the same thickness as the lattice-shaped internal bone toward the center of the lattice plane. As a result, the vertical frame bone on the drum advancing direction side is released from the cylindrical mold by the force directly transmitted from the inner bone, so that a stable amount of lead-acid battery grid is obtained with a small amount of deformation at the time of release. Can be obtained.

[Brief description of the drawings]

FIG. 1A is a plan view of a grid of a lead-acid battery to which the present invention is applied, and FIG. 1B is a cross-sectional view taken along the line BB of FIG.

FIG. 2 is an explanatory diagram schematically illustrating a force transmitted from a lateral inner bone when the lattice body of the embodiment is separated from a drum.

3 (A) is another embodiment, FIG. 3 (B) is still another embodiment, FIG. 3 (C) is another embodiment, and FIG. It is sectional drawing corresponding to a B line cross section.

FIG. 4 (A) is a plan view of a lattice body having an inner bone of an oblique straight line portion, and FIG. 4 (B) is a plan view of a lattice body having an inner bone of an oblique curve portion.

FIG. 5A is a plan view of a conventional lattice body manufactured by a continuous casting method, and FIG. 5B is a cross-sectional view taken along the line BB of FIG.

FIG. 6A is a partially cutaway side view of a casting device used in a continuous casting method, and FIG. 6B is a partially cutaway front view of the casting device.

FIG. 7 is an explanatory view schematically illustrating a release phenomenon in which a continuous casting grid body is separated from a drum.

FIG. 8 is an explanatory diagram schematically illustrating a force transmitted from a horizontal internal bone to a vertical internal bone when a lattice body is separated from a drum.

FIG. 9 is an explanatory diagram schematically illustrating a force transmitted from a horizontal frame bone to a vertical frame bone when a conventional lattice body is separated from a drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ear part 2 vertical frame bone 3 horizontal frame bone 4 frame bone 5 horizontal internal bone 6 vertical internal bone 7 internal bone 8 gradient

Claims (3)

[Claims] 1. A grid for a lead-acid battery, wherein a molten metal is continuously supplied to a surface of a rotating cylindrical mold (drum) to solidify by engraving, and a frame having ears for current collection and a frame. In a lead-acid battery lattice body comprising a lattice-shaped inner bone thinner than a frame bone, the inner bone has substantially the same thickness as the vertical frame bone at an intersection with the vertical frame bone on the drum traveling direction side. A grid body for a lead-acid battery, which has a thickness substantially the same as that of the grid-shaped inner bone toward the center of the grid surface. 2. A grid for a lead-acid battery, wherein a molten metal is continuously supplied to the engraving of the surface of a rotating cylindrical mold (drum) and solidified, and a frame having ears for current collection is provided. A grid for a lead-acid battery, comprising a grid-shaped inner bone thinner than a frame bone, wherein a rounding or chamfering process is performed on a grid surface side of a vertical frame bone on a drum traveling direction side. body. 3. A lead-acid battery comprising the lead-acid battery grid according to claim 1 or 2.