JPH05166512A - Lead-acid battery electrode plate and its manufacture - Google Patents

Abstract

PURPOSE:To provide an expand type lead-acid battery electrode plate excellent in current collecting efficiency, manufacture the plate with fine productivity and provide particularly a manufacture suitable for the plate having high plate height. CONSTITUTION:In an expand type lead-acid battery electrode plate a mesh 7, being not next to a lower part main rib 1 or an upper part main rib 3, forms a hexagon, surrounded by 6 small ribs. A pair of confronting ribs out of the 6 ribs are the thick small ribs 8, having substantially two times indent width against the other small ribs, and the other thin small ribs 9 have extended longer length than that of a lead alloy sheet at an original time. These small ribs are respectively arranged slantwise against the direction of the lower part main rib 1 and upper part main rib 3, and the lug 4 of the upper part main rib 3 deflecting protrudes in the slanting direction of the thick small ribs 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lead-acid battery electrode plate and a method for producing the same.

[0002]

2. Description of the Related Art A paste type electrode plate for a lead storage battery is manufactured by applying a paste obtained by kneading lead powder with dilute sulfuric acid to a lead alloy grid. In addition, as a method for manufacturing this lattice, it is generally manufactured by casting or machining, but in recent years, the rate of production by machining with high productivity is increasing.

As the machining method, there are a punching method and an expanding method.
Since the punching process has a drawback that a large amount of chips are generated, the expanding process is mainly used. And for this expanding process,
For example, as shown in Japanese Patent Laid-Open No. 52-144745, there are a post-expansion system in which a slit is first made and this slit is expanded in a subsequent process, and a simultaneous expansion system in which a slit is made and expanded simultaneously. Further, the simultaneous expansion method is disclosed in, for example, Japanese Patent Laid-Open No. 53-79760.
A plurality of cutters and dies parallel to the feed direction of the lead alloy sheet are arranged in a staircase just like the teeth of a crocodile,
A parallel cutter system for feeding a lead sheet from the throat side of the crocodile, and as shown in, for example, US Pat. No. 3,310,438, a plurality of cutters and a single die are arranged perpendicularly to the feed direction of the lead alloy sheet, and a lead alloy sheet. There is a vertical cutter method in which the blades are fed in pitch increments and the cutters are moved in a staggered pattern to perform expansion processing.

[0004]

However, among these methods, the post-expansion method has a problem that a special expansion step is required. Further, in the parallel cutter method, the pitch of the cutter must be 1.5 times the pitch in the length direction due to the expanding method, and the direction of further expansion and the height direction of the net portion are the same direction. However, there is a problem that it requires a very long cutter die-set because it cannot be expanded too much.On the other hand, the vertical cutter method cannot form a continuous expanded mesh part due to the expanding method, and thus the continuous cutting is not possible. Since it is not suitable for production and the cutters have to be moved in a staggered manner, there is a drawback that high-speed production is impossible.

Further, in these methods, since the small bones of the mesh portion of the lattice are arranged in an oblique direction with an obtuse angle with respect to the upper rib, there is a drawback that the current collecting efficiency is poor.

An object of the present invention is to solve the above-mentioned conventional problems, and to provide a method for producing a lead storage battery electrode plate having a high current collecting efficiency with high productivity, In particular, the object is to manufacture an electrode plate having a high electrode plate height by a method suitable for manufacturing the electrode plate.

[0007]

That is, the first aspect of the present invention is provided with a lower rib and an upper rib composed of a solid portion of a lead alloy sheet, and an ear protruding from the upper rib with uneven distribution with respect to the center thereof. In addition, in a lead-acid battery electrode plate having a lattice having an expanded mesh portion between the lower rib and the upper rib, the lower rib and the upper rib are arranged substantially parallel to each other. And a plurality of rows of mesh groups are arranged in a direction perpendicular to the direction of the upper ribs, and the mesh not adjacent to the lower ribs or the upper ribs has a hexagonal shape surrounded by six small bones, One of the 6 small bones facing each other is a thick small bone having a step width that is substantially double that of the other small bones, and the other small bones have a length extended from the time of the original lead alloy sheet. Has a small Both of them are arranged to be inclined with respect to the direction of the lower rib and the upper rib, and the ears protruding unevenly in the center of the upper rib are unevenly projected in the inclination direction of the large and small bones. It is characterized by being present.

The second aspect of the present invention is further provided with a lower rib and an upper rib composed of a solid portion of a lead alloy sheet, and an ear that is unevenly protruded from the center of the upper rib and the lower rib and the upper rib. In a method of manufacturing a lead storage battery electrode plate having a grid body having an expanded mesh portion with a main rib, the wire is inclined at an angle α with respect to a feeding direction of a long lead alloy sheet as a material of the grid body. At least one die, and a plurality of protruding cutters that mesh with the die and shear the lead alloy sheet in a broken line shape and expand to form a net portion, at least the lower part of these cutters The center cutter except for a few cutters close to the ribs or upper ribs has a tip that cuts into the lead alloy sheet and side slopes on both sides of this, and adjacent side slopes of adjacent cutters. The length from the middle point to the tip in the direction of advance of the lead alloy sheet is L, the step width of the lead alloy sheet is D, the angle α of the die and cutter with respect to the direction of advance of the lead alloy sheet, and the feed of the lead alloy sheet. The following formula is established between the pitches P, and it is characterized in that the cutter is lowered at each feed pitch of the lead alloy sheet to make a slit and at the same time widen to form an expanded net portion. It is a thing. α = arctan (D / L) ──── P = D / cos α ────

[0009]

[Operation] With the above configuration, it is possible to provide a lead storage battery electrode plate with high accuracy and good current collection efficiency, and it is also possible to produce a lead storage battery electrode plate having a high electrode plate height. Further, it is possible to provide a manufacturing method having high productivity and short model change time.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the accompanying drawings with reference to the accompanying drawings. FIG. 1 is a front view showing a grid of a lead-acid battery electrode plate according to the present invention, and FIGS. 2 and 3 show the expanding process of the present invention below the cutter when the die and cutter lines are taken horizontally. FIG. 4 is a schematic plan view of a main part of which a part is drawn, and a schematic front view of the main part. FIG. 4 is an enlarged plan view of a main part in which a planned breaking line is drawn on a solid lead alloy sheet for explaining the cutting of the net part of the present invention. Is. Here, 1 is a lower rib which is made of a solid part of a lead alloy sheet, on which a foot 2 is arranged. Further, 3 is also an upper rib and is arranged substantially parallel to the lower rib 1. Further upper rib 3
Is provided with an ear 4 which is eccentrically located and protrudes with respect to a center line a which is the center thereof. In addition, between the lower ribs 1 and the upper ribs 3, there is a mesh portion 5 in which slits are formed in a zigzag pattern and expanded, that is, expanded. That is, the mesh portion 5 is composed of a mesh group arranged in 19 rows in a direction perpendicular to the directions of the lower rib 1 and the upper rib 3, and the mesh other than the mesh 6 closest to the lower rib 1 and the upper rib 3 in this mesh. 7 has a hexagonal shape with 3 pairs of substantially parallel ossicles, but one of the 3 pairs of ossicles has a large ossicle 8 having a step width substantially twice that of the other ossicles of the mesh 7. Has become.
Further, the small bones 9 extending from the large bones 8 to both sides extend in line symmetry with respect to the vertical line b dividing the large bones 8 at the center and are connected to the next large bones 8. The small bones are the original lead alloy sheet. It has a length extended from the time point. Further, all of these small bones are arranged so as to be inclined with respect to the directions of the lower ribs and the upper ribs, and adjacent meshes 7 in the same row share the small bones 9. As described above, the large and small bones 8 are arranged so as to be inclined with respect to the directions of the lower and upper ribs, but the ears 4 are unevenly distributed in the inclination direction of the large and small bones 8 and arranged on the upper rib 3. By doing so, the small and small bones 8 and the fine small bones 9 extending from at least one of the large and small bones 8 face the direction of the ear 4, thereby improving the current collection efficiency. In the claims, "the lower rib and the upper rib are arranged substantially parallel to each other" means a straight line connecting the nodes of the lower rib 1 and the mesh portion 5,
It is also said that the straight lines connecting the nodes of the upper rib 3 and the mesh portion 5 are parallel to each other, which means that they have no direct relation to the processed shape on the end side thereof. Further, in the claims, the meaning of "substantially" of "one pair of the six small bones facing each other is a thick small bone having a step width substantially twice that of the other small bones" Since the fine bones 9 are stretched during the expanding process, the thickness thereof becomes slightly thin, and the thick bones 8 are crushed in a later step, for example, a flat step, but this degree is ignored. Further, in the claims, "all of the small bones are arranged to be inclined with respect to the direction of the lower ribs and the upper ribs" means that one pair of the fine bones 9 is composed of the lower ribs and the upper ribs. This includes the case perpendicular to the direction. The height H of the mesh portion between the lower rib 1 and the upper rib 3 of the lattice in the present embodiment is 233 mm, the width W is 145 mm, and the pitch S between the large and small bones 8 adjacent to each other in the direction of the large and small bones 8 is 24 mm. There is. Note that the lead-acid battery electrode plate of the present embodiment is designed for stationary lead-acid batteries,
The lead alloy sheet uses a calcium-based lead alloy. Next, the manufacturing method will be described with reference to FIGS.
A single die 11 (indicated by a dotted line in FIG. 2) with respect to the feeding direction of the long lead alloy sheet 10 and a plurality of protruding cutters 12 and 13 that mesh with the die 11 (indicated by a chain double-dashed line in FIG. 2). (Indicated by) are arranged at an angle α. That is, this angle α is expressed by an equation. α = arctan (D / L) ───── L: Length from the midpoint of the adjacent side slopes of the adjacent cutters 12 and 13 to the tip in the traveling direction of the lead alloy sheet 10 D: Lead The cut width of the alloy sheet (the cut width of the small bone 9) The cutters 12 and 13 have different shapes because the cutter 1 that bites into the lead alloy sheet 10 that is sent first.
2 is because it is necessary to form a solid portion 14 which becomes the lower rib 1 or the upper rib 3 on the outer side thereof, and therefore the deformation cannot be increased, so that a shallow protrusion must be formed, and the following 2-3 sheets are required. Cutter and last 2
As for the three cutters, in order to prevent breakage of the minute bones 9 due to stress concentration, a cutter having a shallow projection in stages may be used. In this embodiment, the first and last cutters are shallowly protruding cutters 12, and the middle 17 cutters are deeply protruding cutters 13. Further, in the present embodiment, the lead alloy sheet 10 is formed from the pitch S of the cutters 13 and the midpoint of the adjacent side inclined portions of the adjacent cutters 13.
The equation holds between the length L up to the tip in the traveling direction of. That is, the cutter 13 is symmetrical. S = 2 × L In this embodiment, S = 24 mm to L = 12 mm,
Since D = 1.3 mm, α≈6.18 °. The lead alloy sheet 10 is fed at the feed pitch P represented by the formula to the die 11 and the cutters 12, 13 arranged in such a positional relationship, and the cutters 12, 13 are lowered at each feed pitch to make a cut. At the same time, it is expanded to form an expanded net portion. P = D / cos α In this example, P≈12.07 mm. By performing the processing in the above relationship, the zigzag net portion is formed only by the vertical movement of the cutters 12 and 13 as shown in FIG. That is, the mesh portion 5 is configured by expanding a plurality of slit broken lines c formed by a plurality of slits 15 formed in the broken line at equal intervals, and the number of the slits 15 of each slit broken line c is the same. And
Straight lines d, e connecting the start points 16 and the end points 17 of the slits 15 in the same order in each slit broken line c
The slits 15 are carved so as to be parallel to the straight lines f and g connecting the nodes of the lower rib 1 and the upper rib 3 and the mesh portion. After the above expanding process, the flattening step of flattening the net portion 5 is carried out. A kneading paper is brought into contact with the lower surface to apply the paste, and a kneading paper is further brought into contact with the upper surface and pressed. An electrode plate for a lead storage battery is manufactured through a step, a step of forming the legs 2 and ears 4 from the solid parts on both sides of the net portion 5 by punching, a trimming process of cutting the electrode plate size, and a drying process of drying the electrode plate. ..

Although one embodiment of the present invention has been described above, various embodiments of the present invention are conceivable without departing from the spirit of the present invention. That is, in the above embodiment, only the one using a single die and a cutter was described,
By combining the double-row die and the cutter in a V shape and performing expansion processing, two rows of lead-acid battery plates are provided for a single-row lead alloy sheet, and a solid upper rib in the center of the lead alloy sheet. It is also possible to form it in the form of parts. Further, a small lead storage battery electrode plate can be efficiently manufactured by sending a plurality of lead alloy sheets to a die set in which a plurality of lead dies and a pair of cutters are arranged in a V shape. In addition, which side of the solid parts 14 on both sides of the lead alloy sheet is the lower rib 1 or the upper rib 3
However, it is general to set the wide upper rib 3 side to the final cutter side because of the pressing force when feeding the lead alloy sheet. Further, by making the cutters 12, 1 non-axisymmetric, it is possible to form the mesh portion 5 in which the lengths and angles of the fine bones 9 on both sides of the thick and small bones 7 are changed.

[0012]

Since the present invention is constructed as described above, it has the following effects. (1) Since the meshes 6 and 7 are made at the same time as making the cuts and expanding the meshes, the accuracy of the mesh portion 5 can be improved. Moreover, no special expansion process is required. (2) The large and small bones 8 are arranged to be inclined with respect to the lattice body, and the ears 4 are unevenly distributed in the inclination direction of the large and small bones 8 and the upper rib 3
Further, the fine bones 9 extending from one side with respect to the large and small bones 8 are directed toward the ear 4, so that the current collection efficiency is improved. (3) Since a short die and a cutter die set are sufficient, it is possible to produce with a small press machine, and conversely, it is possible to produce a high lead-acid battery electrode plate.
For example, the total length of the cutter row in the above embodiment is 24 mm × 19
While the number of sheets is 456 mm, if the same net height is obtained by the parallel cutter method, even if the expansion height of one cutter is 7.8 mm, which is the same as that of this embodiment, it is 24 m.
m × 1.5 × (233 mm ÷ 7.8 mm) = 1080 m
m. A press machine for driving such a long length of cutter row is extremely special and has a slow drive speed, but it can be produced at a low cost and at a high speed. That is, the electrode plate height in the parallel cutter system that can be accommodated in the cutter length of 700 mm by the same calculation is about 150 mm, and if it is longer than this, a special press machine is required. It is extremely excellent when applied to a lead-acid battery electrode plate having a height H of 150 mm or more. (4) It is possible to continuously coat the active material on both sides of a long lead alloy sheet while leaving a solid portion, and to obtain high productivity. (5) By changing only the feed angle of the lead alloy sheet to the die and the cutter, and the feed pitch P, it is possible to form a mesh part with different cut widths with the same die and cutter, and it is extremely easy to change the model. Is.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a grid body of a lead storage battery electrode plate according to the present invention.

FIG. 2 is a schematic plan view of an essential part illustrating a portion below the cutter when the die and cutter lines are taken in the horizontal direction in the expanding process of the present invention.

FIG. 3 is a schematic front view of an essential part of the expanding process of the present invention when a die and a cutter line are taken in a horizontal direction.

FIG. 4 is an enlarged plan view of an essential part of a solid lead alloy sheet in which a planned breaking line is drawn for explaining the cutting of the net portion of the present invention.

[Explanation of symbols]

 1 ------------ Lower rib 2 ------------ Foot 3 ------------ Upper rib 4 ----- ------- Ear 5 ------------ Net part 6, 7 -------- Mesh 8 ------------ Large and small bones 9 ------------ Fine bones 10 ------------ Die 12, 13 ------ Cutter 14 ---------- --Solid part 15 ------------ Slit 16 ------------ Starting point 17 ------------ Ending point

Claims (4)

[Claims] 1. A lower rib and an upper rib composed of a solid part of a lead alloy sheet, and an upper rib with an ear protruding unevenly from the center of the lead rib, and an expanded portion between the lower rib and the upper rib. In a lead-acid battery electrode plate having a grid having a processed mesh portion, a lower rib and an upper rib are arranged substantially in parallel, and a plurality of rows are arranged in a direction perpendicular to the directions of the lower rib and the upper rib. The mesh group is arranged, and the mesh that is not adjacent to the lower rib or the upper rib has a hexagonal shape surrounded by 6 small bones, and one pair of the 6 small bones facing each other is The small bones have a step size substantially twice that of the small bones, and the other small bones have a length extended from the time of the original lead alloy sheet. Both are lower ribs and upper ribs An electrode plate for a lead storage battery, which is arranged so as to be inclined with respect to the direction, and wherein the ears of the upper ribs are unevenly distributed and protrude in the inclination direction of the thick and small bones. 2. The electrode plate for a lead storage battery according to claim 1, wherein the height H of the mesh portion is 150 mm or more. 3. A lower rib and an upper rib composed of a solid part of a lead alloy sheet, and an ear having an eccentric protrusion protruding from the center of the upper rib, and an expanded portion between the lower rib and the upper rib. In a method for manufacturing a lead storage battery electrode plate having a grid having a processed mesh portion, an angle α is formed with respect to a feeding direction of a long lead alloy sheet used as a material of the grid.
At least one die, which is arranged to be inclined with, and a plurality of protruding cutters that mesh with the die and shear the lead alloy sheet in a broken line shape and expand to form a net portion, among these cutters The cutter in the central part except at least a few cutters near the lower rib or the upper rib has a tip part that bites into the lead alloy sheet and side slope parts on both sides of this, and adjacent side parts of adjacent cutters. The length from the midpoint of the inclined portion to the tip in the traveling direction of the lead alloy sheet is L, the step width of the lead alloy sheet is D, the angle α of the die and the cutter with respect to the traveling direction of the lead alloy sheet, and the lead alloy sheet. The following formula is established between the feed pitches P of P and the pitch of the lead alloy sheet is lowered at each feed pitch to make a cut, and at the same time, the net is expanded and expanded. Method of manufacturing a lead storage battery electrode plate, which comprises forming. α = arctan (D / L) ──── P = D / cos α ──── 4. An equation is established between the pitch S of the cutters and the length L from the midpoint of the adjacent side slopes of the adjacent cutters to the tip in the advancing direction of the lead alloy sheet. The method for manufacturing a lead-acid battery electrode plate according to claim 3. S = 2 × L ────