JP2010227996A - Lattice substrate for storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent casting defects of a multiple patterning lattice substrate for a storage battery having slanting lattice. <P>SOLUTION: As a method of preventing casting defects of a multiple patterning casting lattice substrate that has a structure of two or more levels having slanting lattice for use of an electrode plate of a lead storage battery, there is a method in which the chamfering curvature radius is set to be ≥1.5 mm in the intersection between the vertical lattice of a substrate situated lowest in casting and the frame lattice of horizontal direction above the vertical lattice, and consequently is set it to be larger than the intersection of any lattice in the same substrate and other substrates, so that flowability is improved thereby preventing defects of the lattice. The chamfering curvature radius is set to be ≥1.5 mm for the lower corner of the intersection between the vertical lattice of the lattice substrate situated lowest in casting and the frame lattice of horizontal direction above the vertical lattice, and consequently is set to be larger than the chamfering curvature of corners in the intersections of the other lattice in all substrates. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to a structure of a lattice substrate manufactured by multi-face casting of a lead storage battery.

  The lattice substrate used for the electrode plate of the lead storage battery is produced by casting a lead alloy. Usually, a connecting substrate in which a plurality of unit substrates are connected in the vertical and / or horizontal directions or both is manufactured by one casting, and the connecting portion is cut and separated after filling the active material in a batch. A large number of electrode plates are efficiently obtained by this method (Patent Document 1). In this case, a normal method for casting a lattice substrate is to carve a die divided into two parts on the front and back based on a predetermined lattice design, tighten them facing each other, pour molten lead from the upper gate, and cool it. It is based on the procedure of taking out.

Japanese Patent Laid-Open No. 2-192659

  In the production of a lattice substrate, quality defects such as discontinuities, voids, or thinning of the lattice may occur in the lattice structure after casting. These quality defects are not preferable because the electrode plate is deformed due to insufficient strength of the lattice, or the performance and life of the electrode plate are deteriorated due to insufficient current collection, leading to a decrease in storage battery quality.

In response to recent demands for higher capacity and lighter storage batteries, the grid size of substrates tends to become thinner, and more advanced techniques are required for quality measures during casting. In order to reinforce the entire lattice plane, the applicant previously proposed to add an oblique middle lattice in an oblique direction over almost the entire lattice length (Japanese Patent Application No. 2008-267639).

  With this improvement, an improvement in strength could be achieved, but the addition of a mid-grid from an angle further complicated the flow of molten lead in the mold and made it non-uniform. There is a tendency for the occurrence of casting defects to increase in the lattice portion, and it has become an important issue to reduce casting defects by improving the flow of molten metal in the mold.

The present invention has been made to solve the above-mentioned problems. As a result of various studies, a vertical lattice provided in a vertical direction in a mold at the time of casting in a lattice substrate positioned at the bottom of a connection substrate at the time of casting. And the chamfering curvature (R) of the intersection with the horizontal frame lattice intersecting at the upper part, the chamfering curvature of the other portion of the same substrate and the same portion of the other lattice substrate located above it It has been found that, by making it larger than this, the wraparound of molten lead to the lower lattice substrate is improved, and the casting defects of the lattice can be reduced regardless of the presence of the oblique lattice.

  According to the present invention, even in a connected lattice substrate having a slanted intermediate lattice for a storage battery, it is possible to prevent substrate quality defects due to the multi-faced casting method.

It is a front view which shows the Example of this invention.

  Embodiments of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a multi-sided cast substrate according to an embodiment of the present invention. In the example shown in the figure, a multi-planar casting substrate 1 is obtained in which four lattice substrates 2 are arranged in a row in the horizontal direction and connected in three rows, and a total of 12 lattice substrates can be cast and produced simultaneously. .

  Each lattice substrate 2 has a relatively thick frame lattice 21 formed in a quadrilateral shape, a narrower middle lattice 22 formed so as to intersect in the vertical and horizontal directions, and each lattice substrate 2 connected in the horizontal direction. In addition, an oblique middle lattice 24 is provided diagonally from the portion where the ear portion 23 is provided inside each lattice.

In addition, the lattice substrates 2 are connected to each other in the vertical direction between the upper and lower sides of the frame lattice 21 by the connecting portions 25, and a large number of lattice substrates 2 are integrated and cast at the same time to be produced as a connected lattice substrate.

  Specifically, although not shown, the fixed mold and the movable mold in which the inner surface of the mold is engraved in the above-mentioned lattice shape are fastened together, and molten lead is poured from the gate formed on the top, and the molten lead is connected to each lattice substrate. A large number of lattice substrates of a predetermined shape can be cast at the same time by flowing down in the mold while wrapping around the corners and ears, and taking out as a multi-sided cast substrate solidified after cooling for a predetermined time.

  At this time, in the lattice substrate positioned at the bottom during casting, that is, the lattice substrate 3 in the example shown in the figure, the frame lattice 31 that is located above and extends in the horizontal direction, and the vertical center that descends vertically from the frame lattice 31. The chamfering curvature (R) of the intersecting portion 5 of the grating 32 is made larger than the chamfering curvature of other intersecting portions, that is, other intersecting portions in the same substrate and corresponding intersecting portions of the other-stage lattice substrates.

  In addition, the larger the curvature (R), the more effective the effect of uniforming the hot water flow can be expected. Further, the shape of the curvature (R) is preferably a perfect circle that is easy to process, but the effect can be obtained if the surface state is smooth even in other shapes.

  In addition, 4 in a figure is the ear | edge for suspension used in order to convey the multi-surface casting substrate 1 at the time of manufacture of a storage battery.

  A number of connected grid substrates 1 thus cast are then applied and filled together with active materials, and then cut and separated as electrode plates of the size of each grid substrate 2 before being used for storage batteries. Is.

  The outer dimension of the rectangular frame lattice of the lattice substrate is 44.5 mm x 47 mm, and the cross section thereof is 1.6 mm wide and 1.4 mm thick in the frame lattice portion that is horizontal during casting, and the width of the frame lattice portion that is vertical in casting, Both thicknesses are 1.4 mm. In this frame lattice, a plurality of medium lattices having a width of 0.9 mm and a thickness of 0.8 mm are formed in parallel in the vertical and horizontal directions. The frame lattice protrudes horizontally and vertically to form an ear portion having the same thickness as the frame lattice, and one diagonal lattice in the diagonal direction is the same as the middle lattice from each portion where the horizontal ear portion is formed. It is formed with width and thickness.

  A mold according to the above-mentioned lattice substrate design was prepared, and the lattice substrate consisting of 12 sheets shown in FIG. The material of molten lead is a Pb—Ca—Sn alloy.

  At this time, the chamfered portion of the intersection between the frame lattice 31 that is located at the upper portion of the lattice substrate 3 that is located at the bottom during casting and extends in the horizontal direction and the upper end of the vertical middle lattice 32 that descends vertically from the frame lattice 31. The curvature (R) was set to a radius of 1.5 mm, and the chamfered curvatures of other portions, that is, other intersections and other lattice substrate intersections were all set to a radius of 1.0 mm.

(Comparative example)
As a comparative example, all the chamfered curvatures of the intersecting portions of the frame lattice positioned at the upper portion of the lattice substrate positioned at the lowermost portion during casting and the vertical lattice are set to a radius of 1.0 mm, and the intersecting portions of other portions and other lattice substrates A lattice substrate similar to that of the example was manufactured by a multi-chamfered casting method except that the chamfered curvature was the same.

According to the above examples and comparative examples, 100 multi-sided cast substrates were cast, and the presence or absence of casting defects such as cuts was visually examined. The results are as follows.
In the example, there are no casting defects.
In the comparative example, there was a casting defect, and breakage occurred on 20 substrates.

  As described above, according to the present invention, when casting a multi-chamfered lattice substrate having an oblique lattice for a storage battery, the chamfering curvature at the intersection of the vertical lattice of the lowermost substrate and the frame lattice located at the upper end is increased. As a result, the effect of producing a good substrate without casting defects was obtained.

  Further, the above description has been given of the substrate having only one diagonal lattice. However, even in the case where there are a plurality of similar oblique lattices, R is larger than the intersection of other portions of the lattice as in the embodiment. Thus, an improvement effect can be obtained.

DESCRIPTION OF SYMBOLS 1 Multi-chamfer connection lattice board 2 Lattice board 3 Bottom lattice board 5 Crossing of frame lattice and vertical lattice in the upper part of bottom lattice board

Claims (2)

  In the casting in which a plurality of substrates are arranged in the vertical direction on the lattice substrate of the storage battery, the intersection of the vertical lattice on the substrate located at the bottom of the mold and the horizontal frame lattice intersecting at the upper end of the substrate A grid substrate structure for a storage battery, characterized in that a chamfer curvature (R) is larger than a chamfer curvature of a similar intersection of the substrate and another lattice substrate positioned above the substrate.   The grid substrate structure for a storage battery according to claim 1, wherein the curvature (R) of the chamfer is 1.5 mm or more in radius.

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