JP2007188701A - Manufacturing method of expanded lattice body for lead-acid storage battery, lead-acid storage battery, and manufacturing device of expanded lattice body for lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of an expanded lattice body for lead-acid storage battery capable of improving remarkably dimensional accuracy of each portion of an expanded electrode plate, a lead-acid storage battery suppressed in internal short circuit and variations in welding depth of the electrode ear part with high reliability, and a manufacturing device of the expanded lattice body for lead-acid storage battery. <P>SOLUTION: The expanded lattice body for lead-acid storage battery is manufactured by forming slits at both side sections of a sheet by applying a reciprocating movement of a pair of expand-processing blades in which a plurality of dice blades are arranged in a row, and forming an expanded mesh of net by expanding and stretching this slit formation portion. Cutting blades are respectively installed on sheet supply side of the pair of expand-processing blades, and the side end sections of the sheet are press cut by these cutting blades so that the width dimension of the sheet may be a prescribed dimension. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for manufacturing an expanded lattice for a lead storage battery, a lead storage battery including an expanded lattice obtained by the manufacturing method, and an apparatus for manufacturing an expanded lattice for a lead storage battery.

  There are two methods for manufacturing a lead-acid battery grid, generally, a casting method and an expand method. At present, however, the mainstream is high-expansion processing that can produce a grid at a higher speed, especially for lead-acid batteries for automobiles. It has become. As one method of this expanding process, a so-called reciprocating expanding system is used in which a slit part is formed in a lead alloy sheet using an expanding blade that performs reciprocating motion, and an expanded mesh part is formed by expanding the slit part. Yes.

  In general, in the expanded mesh production for a lead storage battery by such a reciprocating expand method, as shown in FIG. 1, an expanded blade 102 in which a plurality of die blades 101 are arranged in a row is combined with a lower blade 103, By performing reciprocating (reciprocating) movement of the expanding blade 102 with respect to the lower blade 103, an expanded mesh 202 is formed on both sides of the sheet 201 as shown in FIGS.

  2 shows a state in which the expanding blade 102 is viewed from the direction of the arrow A in FIG. 1, but the expanding blades 102 are disposed so as to face each other, thereby forming an expanded mesh 202 on both sides of the sheet 201. Is done.

  Thereafter, as shown in FIG. 4, the expanded mesh 202 is filled with the active material paste 203, and a single expanded electrode plate 204 is formed by cutting. At this time, the plain portion 205 at the center of the sheet 201 is cut to form the electrode plate ear 206.

  Unlike the cast lattice body, the expanded lattice body has a drawback that the dimensional accuracy of the electrode plate height is reduced due to variations in the development width. In order to suppress such variation in the width of the expansion, as shown in Patent Document 1, the movement distances of the both sides and the center of the expanded mesh are made substantially the same, or as shown in Patent Document 2, It has been shown that the forming roller for mesh thickness adjustment has a barrel shape, and in particular, the improvement of the height dimension accuracy of the expanded electrode plate has been studied from the viewpoint of suppressing the variation in the expanded deployment width. .

  On the other hand, the lattice manufacturing by the reciprocating expand method is accurately performed at a predetermined pitch between the expanding blade that performs reciprocating motion (generally, reciprocating motion in the vertical direction) and the lower blade that fits the expanding blade, It is necessary to supply a sheet.

  In the expanding process, when a deviation occurs between the center line L of the expanding blades arranged in a pair and the width center line M of the sheet, the width dimensions a, In addition to b, the dimensional accuracy of the entire height dimension h including the electrode tab 206 of the expanded electrode plate 204 is lowered, and the variation is increased.

  Such a shift between the two center lines is also caused by a positional shift at the start of sheet supply to the expanding blade or a meandering sheet. Further, since the expanding blade reciprocates, vibration is generated, and the sheet supply position may be shifted and fluctuated due to this vibration. Such improvement of the sheet supply state has not been studied so far, and still remains as an unsolved problem.

Variations in the dimensions of each part of the electrode plate caused by the mechanism as described above hinder the productivity during battery assembly, or the welding depth of the electrode plate ear 206 when the electrode plate ear 206 is collectively welded by strap welding. May occur, welding may be insufficient, or the electrode plate ear 206 may fall off from a strap (not shown). In addition, when the electrode plate height is higher than the specified dimension range, it becomes easy to short-circuit with the electrode plate of different polarity.
JP 11-73972 A JP-A-8-315827

  The present invention, particularly in the production of an expanded grid for a lead storage battery by a reciprocating expand system, suppresses the positional deviation between the expanded blade and the sheet, and the variation in the dimensions of each part of the expanded electrode plate, as described above, This makes it possible to produce expands with high dimensional accuracy.

  By improving the dimensional accuracy of the expanded electrode plate, it is possible to reduce internal short-circuits between different polarity plate plates, variations in the welding depth of the electrode plate ears, and suppress the decrease in the current collection efficiency of the grid. It becomes.

  In order to solve the above-described problem, the invention according to claim 1 of the present invention reciprocates a pair of expanding blades in which a plurality of die blades are arranged in rows to form slits on both sides of the sheet, A method for producing an expanded grid for a lead storage battery in which an expanded mesh is formed by expanding and expanding the slit forming portion, wherein a cutting blade is provided on each sheet supply side of the pair of expanding blades, and the cutting blade is used to form the sheet. The manufacturing method of the expanded grid | lattice body for lead acid batteries characterized by press-cutting the side edge part of a sheet | seat so that the width dimension of this may become a predetermined dimension.

  Moreover, the invention which concerns on Claim 2 of this invention shows the lead acid battery provided with the expanded-grid body obtained by the manufacturing method of the expanded-grid body for lead-acid batteries of Claim 1. FIG.

  Furthermore, the invention according to claim 3 of the present invention includes a pair of expanding blades in which a plurality of die blades that reciprocate to form slits on both sides of the sheet are arranged in a row, and the pair of expanding blades 1 shows an apparatus for manufacturing an expanded lattice body for a lead storage battery provided with cutting blades that press-cut the side edge portions of the sheet so that the sheet width dimension becomes a predetermined width dimension on the sheet supply side.

  According to the configuration of the present invention described above, the sheet side end portion is cut into the specified width dimension by the cutting blade prior to the expanding process. Thereby, the sheet width center line after cutting can be made to coincide with the center line of the expanding blade. Thereby, the dimensional accuracy of each part of the expanded electrode plate can be remarkably improved.

  In addition, it is possible to provide a highly reliable lead-acid battery by suppressing internal short circuit and electrode plate ear welding depth variation, which have conventionally occurred due to electrode plate size variation.

  The configuration of the present invention will be described. In addition, in the manufacturing method and manufacturing apparatus of the expanded lattice body for storage batteries of this invention, the expanding blade to be used has the characteristics.

  FIG. 5 is a view showing an expanding blade 501 used in the present invention, and FIG. 6 is a view showing a state in which a pair of the expanding blades 501 are arranged to face each other. In FIG. 1, the expanding blades 501 opposed to each other in FIG. It is a figure which shows the state which looked at from the arrow B direction.

  In the expand 501, die blades 502 for forming an expanded mesh are arranged in a row. The size of the die blade surface 502a of the die blade 502 is set to be gradually reduced so that slits are formed sequentially from both sides of the sheet 701. There is no change.

  In the present invention, cutting blades 503 are integrally provided on the expanding blade 501 on the sheet supply side of the expanding blade 501. In the case where the mesh portions are formed symmetrically on both sides of the sheet, the distances (D, D ′) from the two cutting blade surfaces 503a and the center line P are the same, that is, D = D ′.

  As shown in FIG. 7, the expanding blade 501 is combined with the lower blade 702. At the time of expanding, the expanding blade 501 moves reciprocally relative to the lower blade 702, and the die blade surface 502a and the cutting blade surface 503a are repeatedly engaged and detached from the lower blade to form an expanded mesh 703. .

  In the present invention, a sheet 701 having a dimension between two cutting blade surfaces 503a, that is, a width dimension X exceeding 2 × D is supplied to perform an expanding process. As shown in FIGS. 7 and 8, the cutting blade 503 cuts a portion exceeding the interval (2 × D) of the cutting blade surface 503 a having the sheet width dimension X.

  In the present invention, the sheet 701 is adjusted to a predetermined width dimension (2 × D) by the cutting blade 503. Then, by the width adjustment by the cutting blade 503, the sheet width center line Q after cutting naturally matches the center line P of the expanding blade 501.

  Thus, in the present invention, even when the center line P of the expanding blade 501 provided in a pair with the width direction center line of the sheet is displaced due to the meandering of the sheet or the like, the displacement is corrected by the cutting blade 503, and the die At the stage where the expanded mesh 703 is formed by the blade 502, the sheet width direction center line Q and the center line P of the expanding blade 501 coincide with each other, so that the pole plate height, the upper frame bone width, and the bottom bone width in the expanded electrode plate are matched. Variation can be significantly reduced.

  Further, since the cutting blade 503 is provided integrally with the expanding blade 501, the positional relationship with the die blade is constant, and cutting with the cutting blade 503 and the die blade 502 are performed almost simultaneously with the sheet 701 fixed. Since the expanded mesh is formed, the sheet 701 is expanded with extremely high accuracy. In addition, when the cutting blade 503 is provided separately from the expanding blade 501, misalignment occurs between them, so that the effect of the present invention is hardly obtained.

  Furthermore, in addition to the above-described effects, the present invention only requires that the sheet width to be used basically exceeds 2 × D. Therefore, the sheet types conventionally set for each sheet width are integrated and reduced. Thus, productivity in sheet manufacturing, and consequently lead acid battery manufacture, can be significantly improved, and manufacturing cost of the lead acid battery can be reduced.

  In the process of expanding, cutting waste 704 is generated by the cutting blade 503, and this cutting waste can be recycled by being put into a lead alloy melting furnace in the sheet manufacturing process. Don't be.

  As the sheet 701, a Pb—Ca alloy, a Pb—Ca—Sn alloy, or a lead alloy containing an additive element such as Ba, Ag, Bi, or the like, which is conventionally known as a lead alloy for a lead-acid battery expanded lattice. A sheet can be used.

  After forming the expanded mesh 703 on the sheet 701, according to a conventional method, the expanded mesh 703 is passed between forming rollers to adjust the thickness, and after paste filling, cutting, aging and drying to obtain an electrode plate for a lead storage battery. Good. Moreover, the lead acid battery of this invention can be obtained by assembling a battery by a conventional method using this electrode plate.

  In the present invention, the total height h of the expanded lattice and the variation in the dimensions of the upper frame bone and the bottom bone can be suppressed. By suppressing the variation of the current collection or the current collection efficiency of the grid, a highly reliable lead storage battery with little variation can be obtained.

  An expanded grid for a lead storage battery was prepared by the above-described configuration of the present invention and the configuration of the conventional example, filled with a positive electrode active material paste, and aged and dried to prepare a positive electrode plate.

(1) Example of the Invention As described in the embodiment of the invention, the example of the present invention is provided with the cutting blade 503 on the sheet supply side of the pair of expanding blades 501, and the cutting blades of the two cutting blades 503. The interval between the surfaces 503a was 64.0 mm. The sheet as a lattice material is composed of a Pb—Ca—Sn alloy containing 0.06% by mass of Ca and 1.6% by mass of Sn and the balance being Pb. The thickness is 0.90 mm and the width is 68.0 mm. It is.

(2) Comparative Example The comparative example is an expanded lattice body having the conventional configuration shown in FIGS. 1 to 3 and does not use the cutting blade 503 in the present invention example. The shape of the die blade is the same as that of the example of the present invention except that the shape of the lower blade is changed in correspondence with the cutting blade 503.

  The sheet used in the comparative example is the same in composition and thickness as that of the example of the present invention, but the width dimension is 64.0 mm. This is the same dimension as the sheet width dimension after being cut by the cutting blade 503 in the example of the present invention.

  In both the inventive example and the comparative example, the expanded mesh was passed through the pair of forming rollers to adjust the thickness. The expanded mesh body was prepared both as a single-piece lattice processed by cutting a single plate without being filled with the active material paste, and as an electrode plate in which the active material was filled and aged and dried after cutting the single plate. Further, the expanded lattice dimension is a specified dimension, and the upper frame bone width dimension a, the expanded deployment dimension W and the bottom bone width dimension b shown in FIG. 4 are 3.5 mm, 100. It was set to 0 mm and 2.0 mm.

  In this example, the expanded deployment dimension W includes the bony bone width dimension b. In addition, the pole plate ear is 20. It protruded at a height of mm. Therefore, the total height dimension of the grid body, that is, the h dimension in FIG. 4 is the sum of the electrode plate protrusion height 20.0 mm, the upper frame bone width dimension 3.5 mm, and the expanded deployment dimension 100.0 mm. 5 mm.

  The expanded lattice bodies according to the above-described inventive examples and comparative examples were sampled at each n = 200, and the expanded expansion dimension W and the electrode plate shoulder height dimension h ′ including the upper frame bone were measured. Since both sides of the sheet are expanded into an expanded mesh, the expanded lattice body expanded on the right side when viewed from the top facing the sheet traveling direction is the R side, and the expanded lattice body expanded on the left side is the L side. Separately, the electrode plate shoulder height dimension h ′ (the specified design dimension is 103.5 mm) was measured. The results are shown in Table 1.

  From the results shown in Table 1, it can be seen that the inventive example is more stable and superior in dimensions on both the R side and the L side than the comparative example. In particular, in the comparative example, the average value on the R side is significantly less than the prescribed design dimension of 103.5 mm, while the L side greatly exceeds this design dimension. Such variation between the R side and the L side is due to the shift of the supply position of the sheet to the expanding blade. In the example of the present invention, the sheet width dimension center line and the expanding blade center line are made to coincide with each other by the cutting blade regardless of the sheet supply state, thereby suppressing variations between the R side and the L side.

  In addition, even when the amount of deviation of the center line varies with time due to the meandering of the sheet, the center line in the width direction of the sheet is made to coincide with the center line of the expanding blade by the cutting blade. The dimensional variation can be suppressed to an extremely low level.

  In this embodiment, the electrode plate shoulder height dimension has been described, but the same result is obtained for the electrode plate total height dimension h including the electrode plate ear. Since the electrode plate ear is formed simultaneously with the upper frame bone by press cutting, the electrode plate ear projecting dimension from the upper edge of the upper frame can be formed with very high accuracy. Therefore, it can be seen that the variation in the total height h of the electrode plate substantially coincides with the variation in the height h ′ of the electrode plate shoulder.

  According to the configuration of the present invention, the remarkable improvement effect of the expanded electrode plate dimensional accuracy suppresses the internal short circuit caused by the electrode plate size variation, and the remarkable effect of stabilizing the weld depth dimension of the electrode plate ear portion in the strap. Play.

  For example, when the upper edge of the separator is set to 5.0 mm from the upper edge of the upper frame bone, that is, the height dimension is 108.5, in the example of the present invention, the maximum plate shoulder height to the upper edge of the upper frame bone is 103.82 mm at the maximum. The electrode plate shoulder is not exposed from the upper edge of the separator and is not internally short-circuited with the other electrode. However, in the comparative example, there is a plate having a plate shoulder height of 108.86 mm. In such a plate, the plate plate shoulder height is exposed from the upper edge of the separator, and the probability of an internal short circuit becomes very high. .

  Further, the welding depth of the electrode plate ear will be considered. Here, an example using burning welding, with the electrode plate ears facing upwards, a comb-shaped mold attached to the electrode plate ears, additional lead placed, and the additional lead melted to form a strap State.

  The electrode plate shoulder height dimension h ′, which is the minimum value in the comparative example, is 99.82, and the height dimension (total height dimension h) at the tip of the electrode plate ear is the protrusion dimension (20. 0 mm) and 119.82 mm. On the other hand, when the welding depth is set to 3.5 mm at the specified design dimension 123.5 mm of the total electrode plate height, the height of the strap bottom surface is 120.0 mm and the total height h is 119.mm. At 82 mm, the electrode plate ear is not welded to the strap, resulting in an unwelded defect.

  In addition, since the electrode plate ear does not reach the comb-like gap of the mold, this gap is not blocked by the electrode plate ear, and molten lead dripped from the gap to the separator and the electrode plate shoulder, and the electrode plate group It will damage the whole.

  On the other hand, in the example of the present invention, even at the minimum value, the total height of the electrode plate is 123.0 mm, and the welding depth is 3.0 mm, so that no unwelded defect occurs.

  As described above, according to the present invention, by providing a cutting blade that regulates the sheet width on the sheet supply side of the expanding blade, the dimensional accuracy of the expanded electrode plate varies with a relatively simple configuration, and the internal caused thereby There is a remarkable effect that defects such as a short circuit or welding failure can be suppressed.

  The present invention is extremely suitable for manufacturing lead-acid batteries having the above-described configuration and having an expanded lattice body.

The figure which shows the expanded mesh formation process by an expanded processing blade Diagram showing the expanded blade Diagram showing the process of forming an expanded mesh Diagram showing the process of forming an expanded electrode plate from an expanded mesh The figure which shows the expand processing blade used for this invention The other figure which shows the expand processing blade used for this invention The figure which shows the process in which an expanded electrode plate is formed from the expanded mesh of this invention The other figure which shows the process in which an expanded electrode plate is formed from the expanded mesh of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Die blade 102 Expanding blade 103 Lower blade 201 Sheet 202 Expanded mesh 203 Active material paste 204 Expanded electrode plate 205 Plain part 206 Electrode plate ear 207 Upper frame bone 208 Bottom bone 501 Expanding blade 502 Die blade 502a Die blade surface 503 Cutting Blade 503a Cutting blade surface 701 Sheet 702 Lower blade 703 Expanded mesh 704 Cutting waste

Claims (3)

An expanded grid for lead-acid batteries in which a pair of expanding blades in which a plurality of die blades are arranged in a row are reciprocated to form slits on both sides of the sheet, and the slit forming portions are expanded and expanded to form an expanded mesh. A manufacturing method of
A lead storage battery characterized in that a cutting blade is provided on each sheet supply side of the pair of expanding blades, and the side edges of the sheet are press-cut with the cutting blades so that the width dimension of the sheet becomes a predetermined dimension. For producing an expanded lattice for use. The lead acid battery provided with the expanded grid obtained by the manufacturing method of the expanded grid for lead acid batteries of Claim 1. A pair of expanding blades in which a plurality of die blades that reciprocate to form slits on both sides of the sheet are arranged in a row, and a sheet width dimension is set to a predetermined width on the sheet supply side of the pair of expanding blades An apparatus for manufacturing an expanded lattice for a lead-acid battery, each having a cutting blade that press-cuts the side edge of the sheet so as to have dimensions.

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