JP2010049854A - Manufacturing method of grid for lead-acid storage battery, manufacturing method of electrode plate for lead-acid storage battery, and manufacturing method of lead-acid storage battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lead-acid storage battery with superb mold releasability between a sheet and expansion processing blades, restraining break, crack or the like at grid skeletons and grid knots generated due to expansion, restraining dimensional variations of the grid or an electrode plate, with output characteristics and life characteristics improved, in grid manufacturing of the lead-acid storage battery by a reciprocal expansion method. <P>SOLUTION: In forming an expanded mesh by the reciprocal expansion method, at least an expansion processing blade located at the last sheet-feeding side end is made provided with a tapered part so that a thickness of the processing blade gets thinner toward a chip. The tapered part is not to be provided at an expansion cutting blade side insertion-coupled with the expansion processing blade. With the use of such an expansion processing blade, the grid skeletons or grid knots of the expansion grid are restrained from being broken or cracked, bringing forth a lead-acid storage battery with excellent dimensional accuracy and excellent in output characteristics and life characteristics. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a grid and an electrode plate for a lead storage battery, and a method for manufacturing a lead storage battery.

  In recent years, lead-acid batteries that use a Pb—Ca alloy as a lattice body, which have less self-discharge and excellent liquid-reducing properties, and can reduce maintenance, have become mainstream. As a method for producing a Pb—Ca alloy lattice body, an expanding method is widely used in place of the conventional casting method, in which production efficiency is good, and the lattice body is thinner and the amount of lead used can be reduced more easily.

  In the expanding method, slits are formed in a zigzag pattern on a sheet of lead or lead alloy, and further, the slit forming portion is expanded to form a mesh portion, and this mesh portion is used as a lattice. As a method for forming the mesh portion, a reciprocating expand method (see, for example, Patent Document 1) in which a slit is formed in a sheet by a reciprocating processing blade, and a disk-shaped cutter in which a plurality of processing blades are arranged on the circumference of the disk. There are two types of rotary expanding methods (for example, refer to Patent Document 2) in which a slit is formed in a sheet by rotating the disk-shaped cutter around the center of the circumference and passing the sheet therethrough.

  Among these, in the latter rotary expanding method, the production speed of the mesh portion can be increased relatively easily by increasing the number of rotations of the disk-shaped cutter. In addition, since the size of the mesh portion in principle does not affect the production speed of the mesh portion, it is possible to obtain a grid body with a smaller mesh size that is superior in current collection efficiency without impairing productivity. .

  However, the lattice by the rotary expanding method causes lattice bone torsion peculiar to the processing method. Such a twist is inevitably generated by plastically processing the lattice bone so as to protrude in an arch shape with respect to the sheet surface and then expanding the sheet in the width direction. This is a factor that causes cracks and cuts at the intersections (nodes) between the two, and in some cases, the corrosion resistance and current collection efficiency of the grid body are significantly reduced, and the battery life is rapidly reduced.

  On the other hand, the reciprocating expanding method, as shown in FIG. 1, a plurality of processing blades A1 to An (n is the number of blades, n = 29 in the example of FIG. 1) arranged in a row, The expanded cutting die B in which the cutting blades B1 to Bn corresponding to the processing blades A1 to An are arranged so as to be fitted to the expanding processing die A is used.

  In the normal reciprocating expansion method, the expansion cutting die B is fixed to the press machine, and the expansion processing die A is reciprocated by the press machine so as to be repeatedly fitted and detached with respect to the expansion cutting die B, and these expansion processing is performed. By intermittently feeding a lead or lead alloy sheet between the mold A and the expanded cutting mold B, a staggered slit is formed in the sheet 1 and a portion that becomes a lattice bone surrounded by the slit is processed. A mesh is formed by spreading with the blades A1 to An.

  FIG. 2 shows a state in which the expanding mold A and the expanded cutting mold B are fitted, and the expanding mold A and the expanded cutting mold B are viewed in the direction L in FIG. FIG. Generally, a pair of processing blades A1 to An is arranged in the expanding mold A so as to be symmetric with respect to the center line M of the expanding mold A. In response to this, the expanded cutting mold B has its center The cutting blades B1 to Bn are arranged so as to be symmetrical with respect to the center line M so as to share the line with the center line M of the expanding mold A and correspond to the processing blades A1 to An. In the processing blades A1 to An and the cutting blades B1 to Bn, the distances between the corresponding pairs are gradually reduced in the direction of the sheet 1, that is, from the incoming material side to the outgoing material side. The staggered slits are formed in the sheet 1 by such a configuration.

  It should be noted that a clearance appropriate for shearing the sheet 1 (f1 to f1 shown in FIG. 2) is provided between pairs corresponding to the processing blades A1 to An and the cutting blades B1 to Bn, for example, between the processing blade A1 and the cutting blade B1. fn dimension) is provided, and the same clearance is provided for the subsequent combinations. This clearance varies depending on the composition and physical properties of the sheet 1, but, for example, the composition of the sheet 1 is generally used as Pb-0.05 to 0.10% by mass Ca-0.2 to 2.0. In the case of mass% Sn, it may be set to about 0.05 mm to 0.08 mm.

  However, even if the composition of the sheet is the same, there may be a change in physical properties such as strength due to the subsequent heat treatment. Therefore, the above clearance values are the composition and physical properties of the sheet, and the expanding mold A and An appropriate value should be set in consideration of the durability of the expanded cutting type B. Note that the clearance is exaggerated in FIG.

  FIG. 3 shows a network formed by sequentially expanding from both sides of the sheet 1 toward the center in the width direction of the sheet 1 using the expanding mold A and the expanded cutting mold B shown in FIGS. It is the figure which showed the state which goes. The sheet 1 is intermittently sent from the sheet input side described in FIGS. 1 and 2 to the sheet output side along the sheet traveling direction, and FIG. 3 shows the output shown in FIGS. 1 and 2. It is a figure which shows the state which looked at the solid part 3 which is the center part of the sheet | seat 1 which does not give the network 2 formed by the expanding process type | mold A, the expanded cutting type | mold B, and the expanded process, and the expanded process from the side.

  After the expansion process, as shown in FIG. 4, using a shaping roller 4 and a press (not shown), the mesh 2 (for simplification of the drawing, the portion where the mesh 2 is formed is indicated by a diagonal line with a one-dot chain line) A mesh sheet 5 shown in FIG. 5 is obtained by bending and shaping it flat with respect to the plain portion 3. The mesh sheet 5 is filled with an active material 6 according to the polarity of the electrode plate. For example, by performing a cutting process such as a press process along a cutting line C indicated by a broken line in FIG. An electrode plate 7 is obtained.

  FIG. 6 shows a state in which a part of the active material 6 is removed from the electrode plate 7 and the lattice bone 8a and first and second nodule portions 8b and 8c described later are exposed. Needless to say, in the actual electrode plate 7, most of the lattice bone 8 a, the first knot portion 8 b and the second knot portion 8 c are covered with the active material 6 except for a part thereof.

  Further, as shown in FIG. 3, since it is difficult to directly introduce the developed mesh 2 into the shaping roller 4, the mesh 2 immediately after the expansion process is smoothly applied to the shaping roller 4 by the correction jig 4a. Flattening is performed to such an extent that the mesh 2 is introduced. As an example of the correction jig 4a, as shown in FIGS. 7A and 7B, as it approaches the shaping roller 4, two plane portions 4b corresponding to the two meshes 2 of the correction jig 4a. A configuration in which the angle α is made larger can be used.

  In addition to this, a plurality of pairs of rollers having a spacing that allows the mesh 2 to pass sufficiently is arranged in place of the correction jig 4a shown in FIGS. 7 (a) and 7 (b). As the shaping roller 4 approaches, the clearance between the rollers may be reduced, or another configuration may be used. The flattening of the two meshes 2 before being introduced into the shaping roller 4 is mostly elastic deformation except for some plastic deformation, and the mesh 2 is subjected to plastic deformation by the shaping roller 4. The mesh 2 is bent with respect to the plain portion 3 and fixed in a flat shape.

  In the reciprocating expansion method, slit formation and development proceed simultaneously, and development is basically performed in one direction, that is, in a direction perpendicular to the sheet as shown in FIG. Compared to the above, there is an advantage that the twist of the lattice bone is suppressed, and the molding stress of the lattice bone can be reduced, and a lead-acid battery having a longer life can be obtained.

  However, in the grid body 8 by the reciprocating expand method, when the grid is thinned and the grid grid 8d is made smaller for the purpose of increasing the output of the lead storage battery, the expansion processing is performed for the unit length of the sheet 1. Since it is necessary to increase the number of reciprocations of the mold A, the productivity of the mesh 2 is extremely reduced.

In order to solve such a decrease in productivity of the mesh development part, for example, Patent Document 3 discloses an increase in molding speed by increasing the number of reciprocations per unit time of the expand processing die.
Japanese Patent Laid-Open No. 56-159065 JP 2000-106190 A JP 2007-188702 A

  However, by increasing the molding speed of the reciprocating expand process, the mesh development width (dimension W shown in FIG. 5) shrinks after development, causing the phenomenon of work shrinkage, resulting in variations in the grid dimensions. , The releasability between the mesh and the processing blade is reduced, the positional relationship between the sheet and the processing blade and the cutting blade is shifted, the mesh is deformed, and the lattice bone and the intersection of lattice bones ( Cracks are likely to occur in the nodal part), and such cracks have a problem of promoting lattice corrosion and reducing the battery life. It was also speculated that the releasability reduction phenomenon occurred in connection with the processing shrinkage of the mesh.

  Further, the inventor of the present invention has a grid bone 8 in which the current collecting ear 10 is formed in the grid body 8 shown in FIG. 6 and a grid bone 8a directly connected to the frame bone 9 regardless of the molding speed. Excessive stress is applied between the first knot portion 8b and the first knot portion 8b at the time of bending and compression shaping by the shaping roller 4, and particularly when such a lattice body 8 is used for the positive electrode, the first knot It was found that corrosion breakage is likely to occur at the portion 8b. The disconnection that occurs in the first nodule portion 8b between the frame bone 9 and the lattice bone 8a directly connected thereto is compared to the disconnection of the second nodule portion 8c that is not directly connected to the frame bone 9. As a result, the current collection efficiency of the grid body 8 is greatly reduced, causing a short life due to a rapid capacity reduction of the lead storage battery.

  Furthermore, the present invention improves the releasability between the mesh and the processing blade as described above, and suppresses the meshing shrinkage of the mesh, thereby deforming the mesh and the lattice bone, the knot portion between the lattice bone and the frame bone, In addition, it is possible to suppress the occurrence of cracks at the joints between the lattice bones, particularly the joints between the lattice bones and the frame bones, and the resulting decrease in the battery life of the lead storage battery.

  Further, according to the present invention, by suppressing the processing shrinkage of the mesh as described above, the developed size of the mesh excluding the height of the frame bone and the current collecting ear of the lattice (corresponding to the dimension W shown in FIG. 5). The accuracy is improved, and as a result, the dimensional accuracy of the grid and the electrode plate using the same is improved.

  In order to solve the above-described problems, the present invention provides an expansion mold in which a plurality of machining blades that reciprocate are arranged and an expand cutting mold in which a plurality of cutting blades are arranged so as to mesh with the expanding mold. A sheet made of lead or a lead alloy is fed, and slits are formed on both sides of the sheet in a zigzag pattern, and the lattice bone formed by the slits is developed in a mesh shape by the expanding mold, and the center of the sheet Of a grid for lead-acid batteries by a reciprocating expand method, which forms a frame bone connected to the lattice bone by cutting, pressing or the like, and a current collecting ear connected to the frame bone. In the manufacturing method, a distance between a first side surface of the processing blade that faces the cutting blade and a second side surface that is the side surface opposite to the first side surface is set. When the thickness (t) of the processing blade is set, the processing for forming a lattice grid composed of at least the frame bone, a lattice bone directly connected to the frame bone, and a knot portion of the lattice bone The blade uses a taper portion having a thickness (t) that decreases toward the tip of the processing blade on the second side surface, and after forming the mesh portion, the mesh portion A grid body for a lead storage battery, wherein the mesh part and the plain part are bent by a pressure regulating roller, a pressure regulating press or the like so that the mesh part and the plain part are substantially flush with each other. The method is shown.

Furthermore, this invention shows the manufacturing method of the lead acid battery using the electrode plate for lead acid batteries using the grid body obtained by this invention, and this electrode plate. In this case, it is particularly preferable to use the lattice body for the positive electrode. Further, more preferably, the present invention is characterized by using a sheet having increased tensile strength up to ^{41N / mm 2 ~55N / mm 2} .

  According to the present invention, by collecting the nodule portion between the frame bone and the lattice bone of the lattice body obtained by the reciprocating expanding process, the nodule portion between the lattice bones, and the cracks generated in the lattice bone, A lead-acid battery grid body that suppresses a decrease in electric efficiency can be obtained. By using such a grid body particularly for the positive electrode, a remarkable effect of obtaining a lead-acid battery excellent in output characteristics and life characteristics can be obtained.

  Furthermore, according to a preferable embodiment of the present invention described later, the above-mentioned effect of extending the life of the lead storage battery can be obtained more remarkably, and a lead storage battery grid and electrode plate with excellent dimensional accuracy can be obtained. And other significant effects.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The method for manufacturing a grid for lead-acid batteries and the method for manufacturing a lead-acid battery according to the present invention are the above-described processing blades D2 to Dn, particularly the last material side of the sheet 1, in the grid manufacturing method by the reciprocating expand method. It is characterized by the cutting edge shape of the processing blade Dn located at the end.

  FIG. 8 is a view showing an expanding blade D used in the present invention and an expanded cutting die E that is fitted to the expanding blade D. As shown in FIG. The expanding blade D has convex processing blades D1, D2, D3,..., Dn-4, Dn-3, Dn-2, Dn-1, according to the desired number of grids. Dn (n is a natural number, and in the example of FIG. 8, n = 29. N is a value appropriately set by the designer in accordance with the desired number of grids, electrode plate dimensions, and grid grid dimensions. There is.)

  The processing blade D1 has a lattice bone 17a and a lattice mesh 18a at the lowermost side of the lattice body 14 obtained by the present invention shown in FIG. In addition, since the bottom 14a of the lattice body 14 is preferably a shape that is nearly flat, the tip of the processing blade D1 is generally flat.

  The tip shapes of the processing blades D2 to Dn other than the processing blade D1 are as shown in FIG. 8, and more specifically, as shown in FIGS. 9A, 9B, and 9C, It has a substantially inverted triangular shape, and joins the tip of the second nodule portion 19b which is the intersection of the lattice bones 17b and the first nodule portion 19a which is the intersection of the lattice bone 17a and the frame bone 16 at their tips. For the purpose of reducing stress, the R portion 11 is formed as shown in FIG. 9A, the straight portion 11 ′ is formed as shown in FIG. As shown in FIG. 9C, it can be appropriately selected from a configuration in which the R portions 11 are formed at both ends of the straight portion 11 ′.

  10 is a view showing a state in which the expanding blade D and the expanded cutting die E are viewed from the direction L shown in FIG. 8 in a state where the expanding blade D and the expanding cutting die E shown in FIG. 8 are fitted. It is. As shown in FIG. 10, the expanding blade D has a pair of processing blades D <b> 1 to Dn, like the expanding mold A described above.

  The expanded cutting die E has cutting blades E1 to En corresponding to the processing blades D1 to Dn. In the example shown in FIG. 10, the expanded cutting die E is configured such that each of the cutting blades E <b> 1 to En forms a pair, and each pair of the cutting blades E <b> 1 to En exits from the input side of the sheet 1. The distance between the cutting blade E1 and the cutting blade E1, the cutting blade E2 and the cutting blade E2, and the subsequent cutting blade En and the cutting blade En are sequentially arranged so as to gradually narrow toward the material side.

  Also in the present invention, as already described in the background art, the sheet 1 is sheared between the corresponding pairs of the processing blades D1 to Dn and the cutting blades E1 to En, for example, between the processing blade D1 and the cutting blade E1. Therefore, an appropriate clearance is provided, and similar clearances (f1 to fn dimensions shown in FIG. 10) are provided for the subsequent combinations. This clearance varies depending on the composition and physical properties of the sheet 1, but, for example, the composition of the sheet 1 is generally used as Pb-0.05 to 0.10% by mass Ca-0.2 to 2.0. In the case of mass% Sn, it can be set to about 0.05 mm to 0.08 mm.

  However, even if the composition of the sheet is the same, there may be a change in the physical properties such as the tensile strength and elongation of the sheet 1 due to the subsequent heat treatment, so the above clearance values are the composition and physical properties of the sheet, An appropriate value should be set in consideration of the durability of the expanding blade D and the expanded cutting die E, and does not characterize the present invention.

  In the present invention, in the expanding blade D, the cutting blade Dn positioned at least at the end of the sheet 1 shown in FIGS. 8 and 10 is cut into the cutting blade Dn as shown in FIG. When the distance between the first side surface 1Dn facing the blade En and the second side surface 2Dn, which is the side surface opposite to the side surface, is the thickness (t) of the processing blade Dn, the thickness (t) is A taper portion T that becomes thinner toward the tip of the processing blade is formed on the second side surface 2Dn of the processing blade Dn. In addition, the 1st side surface 1Dn does not form a taper part similarly to a well-known processing blade, and 1st side surface 1Dn is comprised so that it may become parallel to the reciprocating motion direction of the processing blade Dn.

  Note that the thickness β of the tip of the machining blade Dn (t ′ dimension shown in FIG. 10) and the angle β formed by the taper T and the direction perpendicular to the reciprocating direction of the machining blade Dn (horizontal direction in FIG. 10) are The durability of the machining blade Dn affects each other. If the angle β is small, for example, 5 ° to 10 °, even if the t ′ dimension is set to 0 mm, the durability of the machining blade Dn is hardly lowered and the productivity is hardly affected.

On the other hand, when the angle β is 45 ° to 60 °, it is preferable to secure the t ′ dimension to some extent, for example, about 0.2 to 0.5 mm. In order to obtain the effects of the present invention, which will be described later, more significantly, it is preferable to set the t ′ dimension to be smaller than the cutting width of the sheet 1 by the working blade Dn (Gn dimension shown in FIG. 12). If the angle β exceeds 70 °, the effects of the present invention described later can be obtained, but the durability of the machining blade Dn is lowered, which may adversely affect productivity. Therefore, it is preferable to limit the angle β to a range that allows the durable lifetime of the machining blade Dn. For example, the composition of the sheet 1 is Pb−0.05 to 0.09 mass% Ca−0.20 to 2.0. (at a tensile strength of ^{30N / mm 2 ~55N / mm 2} ) wt% Sn was, for a sheet thickness of 1.0 mm, it is preferable to set the angle β within 65 °.

  In order to obtain the effect of the present invention described later more remarkably, it is preferable to form the tapered portion T on the machining blades D2 to Dn-1 other than the machining blade Dn, similarly to Dn. Note that the processing blade D1 is related to the formation of the lowermost lattice bone 17a of the lattice body 14 that is farthest from the frame bone 16 that forms the current collecting ears 15 of the lattice body 14 obtained by the present invention shown in FIG. Since the tip shape of the machining blade D1 has a straight line portion, the amount of penetration of the machining blade D1 in the thickness direction of the sheet 1 is small, and the releasability from the mesh 12 is also comparable to the other machining blades D2 to Dn. Therefore, in the present invention, it is not necessary to provide the tapered portion T as shown in FIG. 11 on the processing blade D1 which is the first blade on the input side of the sheet 1, but the tapered portion T is provided. However, since there is no adverse effect, the tapered portion T may be provided. When the tapered portion T is provided at the tip of all or part of the processing blades D2 to Dn-1, the thickness of the tip portion (the thickness corresponding to the t ′ dimension of the processing blade Dn) is also t of the processing blade Dn. It is sufficient to follow the dimension setting method.

  When forming the mesh 12 by applying the expanding process to the sheet 1 made of lead or lead alloy using the expanding blade D and the expanded cutting die E of the present invention as described above, the expanding blade D and the expanding process are performed. FIG. 12 shows a state where the mesh 12 is viewed from the output side of the mold E toward the input side.

  As shown in FIG. 12, the mesh 12 according to the method of the present invention is less bent at the connecting portion between the mesh 12 and the plain portion 3 than the mesh 2 according to the conventional method shown in FIG. I understand that. In the present invention, when the expanding blade D enters the sheet 1, the mesh 12 is formed by the tapered portion T formed on all or part of the processing blades Dn-1 to D1 in addition to the processing blade Dn or the processing blade Dn. Is gradually pushed upward in FIG. 12, and as a result, the bending of the mesh 12 and the plain portion 3 is relaxed, and the mesh 12 formed on both sides of the plain portion 3 and the plain portion 3 is Compared to the prior art, the shape is closer to a flat surface.

  Therefore, in the present invention, since the plain portion 3 and the mesh 12 formed on both sides of the plain portion 3 are closer to a flat surface as compared with the conventional case, the correction jig 4a, which was conventionally required, is unnecessary. Even if necessary, the angle α formed by the two flat portions 4b of the correction jig 4a can be made larger, and even if the correction jig 4a is used, the length dimension P of the correction jig 4a is Compared with the prior art, it can be made shorter and the area occupied by the expanded mesh production facility can be made smaller.

  Then, after forming the mesh 12 on both sides of the plain portion 3, as shown in FIG. 13, by passing the shaping roller 4 (or shaping press), the thickness is adjusted to a desired thickness shown in FIG. 4. A mesh sheet 13 is obtained. At this time, in the lattice bone 17b, the lattice bone 17b directly connected to the plain portion 3 and the first knot portion 19a of the plain portion 3 are bent, and the surface of the plain portion 3 and the surface of the mesh 12 are It is deformed so as to be substantially parallel.

  Here, the substantially parallel is that the current collecting ears 15 and the mesh 12 formed after the mesh sheet 13 is cut and processed satisfy the condition that the electrode 20 has a desired dimensional shape accuracy range. As long as the dimensional shape accuracy allows, the surface of the current collecting ear 15 and the surface of the mesh 12 are in a state having a slight angle, that is, in the above-described substantially parallel state, in manufacturing. There is no problem.

  The shaping roller 4 (or shaping / thickening means such as a shaping press) bends the mesh 12 at the first knot portion 19a and adjusts the thickness of the lattice body 14 to a desired value as necessary. It has a thickening function. In this case, the shaping roller 4 (or shaping press) causes the first nodule portion 19a, the lattice bone 17b, and the second nodule portion 19b, which is the intersection of the lattice bone 17b and / or the lattice bone 17a, in the thickness direction. By compressing and deforming, the thickness of the mesh 12, that is, the thickness dimension of the lattice body 14 is set within a desired dimensional accuracy.

  Thereafter, the mesh 12 is filled with the active material 6 obtained by a known method according to the desired polarity of the electrode plate, the plain portion 3 is cut along the cutting line C by a known method, and the mesh 12 is made to have a desired length. By cutting at (dimension Q in FIG. 14), as shown in FIG. 15, a lead storage battery electrode plate 20 having a lead storage battery grid 14 according to the manufacturing method of the present invention is obtained.

  Thereafter, the electrode plate 20 is aged and dried by a known method under conditions suitable for the polarity. Then, a lead storage battery is assembled by using a known material such as a separator, a connecting body, a pole pole, a battery case, a lid, a dilute sulfuric acid electrolyte solution, or the like according to a desired specification. Thus, the lead storage battery of the present invention can be obtained.

  Next, the function and effect of the present invention will be described in detail. In the present invention, by providing the taper portion T to the processing blade Dn located at the end of the expanding processing blade D on the output side, the mesh 12 is developed in the lateral direction as compared with the conventional case. When shaping so that the surface and the surface of the plain portion 3 are substantially parallel to each other, the bending angle of the mesh 12 can be reduced as compared with the conventional case.

  As a result, the stress applied to the first nodule portion 19a, which is the intersection of the frame bone 16 and the lattice bone 17b directly connected to the frame bone 16, is reduced, so that cracks and breaks in the first nodule portion 19a are prevented. It is suppressed.

  In particular, almost all of the input (output) current to / from the active material 6 passes through the first nodule portion 19a formed by the lattice bone 17b directly connected to the frame bone 16 and the current collecting ear 15. Therefore, compared to the second knot 19b except for the first knot 19a, the influence on the output characteristics and life characteristics of the lead storage battery when a crack or disconnection occurs is large. Due to these cracks and breaks, the output characteristics and the life characteristics are more significantly reduced.

  In the present invention, since cracks and disconnections in the first knots 19a that greatly affect the current collection efficiency of the grid body 14 can be suppressed, a decrease in the current collection efficiency of the grid body 14 can be significantly suppressed. By using the obtained grid 14, there is a remarkable effect that a lead storage battery having stable output characteristics and life characteristics can be obtained.

  The effect of the present invention that the output characteristics and life characteristics of the lead-acid battery are stabilized can be obtained by using the grid 14 according to the present invention for the positive electrode or the negative electrode. However, cracks generated in the grid of the negative electrode hardly grow as the lead-acid battery is used, but in the case of the positive electrode, the oxidative corrosion of the grid inevitably progresses as the lead-acid battery is used. Such corrosion is likely to occur starting from cracks as described above, and those that were cracks at the beginning of manufacture progressed as cracks with the progress of the period of use, and eventually broken at this part. May occur.

  Therefore, the effects of the present invention described above can be obtained for any of the positive electrode alone, the negative electrode alone, or both of the positive electrode and the negative electrode. Since the degree of influence on the deterioration of the characteristics is larger in the positive electrode than in the negative electrode, if the present invention is applied only to the electrode plate of one polarity, the lattice body 14 or the present invention according to the method of the present invention is used. The electrode plate 20 according to the method of the invention is preferably used for the positive electrode.

  As described above, the operational effects of the present invention that are obtained only when the tapered portion T is formed only on the processing blade Dn have been described. In addition to the processing blade Dn, the following processing blades A1, A2, A3, An-2 are described. , An-1, An effect of the present invention that is commonly obtained when the same tapered portion T as the machining blade Dn is formed on all the machining blades D2 to Dn-1 except An will be described.

  The inventors of the present invention have an expanded processing blade D2 to Dn having a tapered portion T according to the present invention from a mesh as compared with the case of using conventional processing blades A2 to An having no tapered portion T. It was found that the mold release property of was significantly improved. In addition, the cross section of the conventional processing blade An and the cutting blade Bn is shown in FIG. The machining blade An shown in FIG. 16 is applied to other conventional machining blades A1 to An-1.

  When the conventional processing blades A2 to An are used, when the processing blades A2 to An reach the bottom dead center and then move toward the top dead center, the mesh 2 may be pulled by the processing blades A2 to An. there were. Further, such a phenomenon is more prominent when the mesh size is reduced or the processing speed of expansion processing (the number of reciprocations of the expanding blade D per unit time) is increased.

  When the mesh 2 is pulled by the processing blades A2 to An, stress is applied to the lattice bone 8a, the first knot portion 8b, and the second knot portion 8c, so that cracks and breaks are generated in these portions. There was a case.

  In addition, the expanding mold A is detached from the expanded cutting mold B, reaches the top dead center, moves further toward the bottom dead center, and the processing blades A1 to An are formed on the sheet 1 that is forming the mesh 2 again. The sheet 1 needs to be fed at a predetermined pitch during contact, but since the mesh 2 is fed in a state of being pulled upward, the sheet 1 in the process of forming the mesh 2 and the expanded after the sheet 1 feeding process Deviation occurs in the relative positional relationship between the processing die A and the expanded cutting die B, and cracks and cutting are newly generated in the lattice bone 8a, the first knot portion 8b, and the second knot portion 8c.

  In particular, since the processing blade An is closest to the plain portion 3 of the sheet 1, the plain portion 3 can be easily lifted from the expanded cutting die B, and the entire mesh 2 formed on both sides of the plain portion 3 together with the plain portion 3. Increase the amount of lifting. As a result, cracks and cuts in the lattice bone 8a, the first knot portion 8b, and the second knot portion 8c are more likely to occur compared to the other machining blades A1 and the machining blades A2 to An-1.

  In a more preferred embodiment of the present invention, in addition to the machining blade Dn, the taper portion T as shown in FIG. 11 is formed at some or all of the tips of the machining blades D2 to Dn-1, thereby expanding. Suppressing the lifting of the uncut solid portion 3 and the mesh 12 formed on both sides thereof from the expanded cutting die E during processing, thereby causing misalignment between the expanding blade D and the expanding cutting die E and the mesh sheet 13 being formed. Is suppressed. Further, since the releasability between the mesh 12 and the expanded blade D is improved, the stress applied to the mesh 12 when the expanded blade D is released from the mesh 12 is relieved, so that the mesh 12 is configured. Cracks and cutting of the lattice bones 17a and 17b, the first knot portion 19a, and the second knot portion 19b can be suppressed.

  In addition, according to the present invention, as described above, the expanding blade D and the expanded cutting can be achieved by suppressing the lifting of the plain portion 3 and the mesh 12 formed on both sides thereof from the expanded cutting mold E during the expanding processing. Since the positional deviation between the mold E and the mesh sheet 13 being formed is suppressed, the dimensional accuracy in the expanding process is improved. Specifically, the development dimension W of the mesh 12 is stabilized, and as a result, the dimensional accuracy of the development dimension W ′ of the mesh 12 shown in FIG. 15 is improved.

  In addition, in the electrode plate manufacturing process of the lead storage battery, the development dimension W12 of the mesh 12 is changed (expanded or contracted) in the volume of the active material 6 by the aging drying process performed after the filling of the active material 6, and as a result The development dimension W ′ of the mesh 12 on the electrode plate 20 may slightly vary (W ≦ W ′ or W ≧ W ′) from the development dimension W ′ of the mesh 12 before filling with the active material 6. Since the amount of variation varies depending on the active material prescription specific to each lead-acid battery manufacturer, if the relationship between the development dimension W and the development dimension W ′ is grasped in advance, the desired electrode plate 20 The development dimension W ′ of the mesh 12 can be obtained with higher accuracy.

  In order to obtain the effect of the present invention, it is essential to provide the taper portion T on the machining blade Dn, but it is preferable to provide the taper portion T on the other machining blades D2 to Dn-1 as described above. However, it is not essential to provide the tapered portion T on all of the machining blades D2 to Dn-1, for example, the tapered portion T is provided on the machining blade Dn, the machining blade Dn-2, and the machining blade Dn-4. It may be formed by thinning. Further, in addition to the machining blade Dn, a taper portion T is provided only on the machining blades Dn-1, Dn-2, Dn-3 that are relatively close to the plain portion 3, and the machining blade Dn that is separated from the other plain portions 3 is provided. -4 to D2 may be the same as the machining blade An shown in FIG.

  According to such a method, the conventional expanding type A can be effectively utilized. That is, it is not necessary to replace all the processing blades An, An-1,..., A3, A2 mounted on the conventional expanding mold A, and some of the processing blades are shared with the conventional one. Therefore, the configuration of the present invention can be employed while reducing the cost, and the effects of the present invention can be obtained. However, in order to obtain the effect of the present invention to the maximum, it is preferable to provide the taper portion T on all the processing blades Dn to D2 except the processing blade D1. Therefore, when the conventional machining blade is mixed with the expanding machining blade D of the present invention, the number of conventional machining blades used is considered in consideration of whether the effect of the present invention exceeds the level required by each manufacturer. Needless to say, you can decide.

  In the present invention, the presence or absence of the taper portion T hardly contributes to the effect of the present invention for the processing blade D1 at the end of the sheet 1 on the input material side. Therefore, it is not necessary to provide the taper portion T on the machining blade D1.

  Hereinafter, effects of the present invention will be described in Examples. In this example, as a first example, a mesh sheet used for a grid of a lead storage battery was prepared by the conventional method described in the background art and the method according to the present invention described in the embodiment of the present invention.

  Next, in Example 2, in the mesh sheet according to the conventional example created in Example 1 and the mesh sheet according to the conventional example, the nodule portion between the frame bone and the lattice bone and the occurrence of cracks and cuts in the lattice bone are investigated. At the same time, the variation in the mesh development dimension W was calculated as the standard deviation value of the W value. The effect of the present invention was clarified by comparing these investigation results and calculation results between the conventional example and the present invention example.

  Further, in Example 3, the electrode sheet is prepared by filling the mesh sheet by the conventional method prepared in Example 1 and the mesh sheet by the method of the present invention with the active material, and aging and drying. The variation in the width dimension W ′ of the mesh after drying is calculated as a standard deviation value of the W ′ value, and the effect of the present invention is clarified by comparing these values with the conventional example and the present invention example. did. In addition, the polarity of the electrode plate produced both the positive electrode plate and the negative electrode plate.

  Further, in Example 4, a positive electrode plate and a negative electrode plate obtained by the conventional method created in Example 3 and a positive electrode plate and a negative electrode plate obtained by the method of the present invention were combined in a combination described later, thereby obtaining JIS D5301: An 80D26 battery as defined in 2006 “Starting Lead Acid Battery” was prepared. Each of these batteries was subjected to a high rate discharge characteristic test as defined in the JIS standard described above, thereby comparing the output characteristics of the battery of the conventional example and the battery of the present invention.

  In Example 5, the life characteristics of each battery prepared in Example 4 were compared to compare the life characteristics of the battery of the conventional example and the battery of the present invention.

Example 1
Prior to Example 1, a sheet made of a Pb—Ca—Sn alloy (corresponding to the sheet 1 in the above-described embodiment of the present invention) was prepared. The composition of the sheet was a Pb-0.06 mass% Ca-1.60 mass% Sn alloy for the positive electrode, and a Pb-0.06 mass% Ca-0.20 mass% Sn alloy for the negative electrode. As a method for producing the sheet, a molten lead alloy having the composition described above is continuously cast to produce a slab having a thickness of 10 mm, and this slab is rolled with a multi-stage rolling roller. A sheet having a thickness of 0.7 mm and a width of 88.0 mm was prepared using a sheet having a width of 1 mm and a width of 88.0 mm for the negative electrode. In addition, the tensile strength of the positive electrode sheet at the time of expanding was 45 N / mm ² , and the tensile strength of the negative electrode sheet was 30 N / mm ² .

  Using these positive and negative electrode sheets, all the processing blades A1 to An described in the background art with reference to FIGS. 1 to 7 have a tapered portion T as shown in FIG. The expansion processing was performed using the expansion processing mold A and the expansion cutting mold B, and the mesh 2 was formed. In this example, the number n of the cutting blades of the conventional expanding die A and the expanding blade D used in the present invention is 29, and all the cutting blades have a thickness = 10.0 mm. Except for the blade A1 and the processing blade D1, the cutting edge angles of the processing blades A2 to An and the processing blades D2 to Dn with respect to the sheet traveling direction (the angles δ shown in FIGS. 1 and 2 are both 110 °).

  In this embodiment, the cutting edges of the machining blades A2 to An and the machining blades D2 to Dn are symmetric with respect to the movement direction of the expanding die A and the expanding blade D, and the cutting edge angle δ is expanded. Depending on the direction of movement of the mold A and the expanding blade D, it is equally divided into 0.5 δ and has a bilaterally symmetric shape. In addition, an R portion as shown in FIG. 9A is formed at the cutting edge tips of the processing blades A2 to An and the processing blades D2 to Dn. In this embodiment, R = 2.5 mm. . Both the processing blade A1 and the processing blade D1 have a cutting edge angle δ = 0 °, and R portions of R = 2.5 mm are formed at both ends thereof.

  Thereafter, the first knot portion 8b and the second knot portion are plastically deformed by passing the mesh 2 and the plain portion 3 formed at the center thereof through the correction jig 4a and the shaping roller 4. Thus, the thickness of the mesh 2 was adjusted to 1.60 mm for the positive electrode and 1.10 mm for the negative electrode, and the mesh 2 and the uncoated portion that later formed the current collecting ear 10 were shaped on substantially the same plane.

  Next, using the above-described positive electrode sheet and negative electrode sheet, the expanded processing blade D and the expanded cutting die E used in the present invention described in the embodiment of the present invention, the mesh according to the present invention is used. 12 was created. The mesh 12 has at least the machining die Dn, or all of the machining dies D2 to Dn-1 in addition to the machining die Dn, or a part of the machining die D2 to the machining die Dn-1 in addition to the machining die Dn. The taper part T like the processing die Dn shown in FIG. 11 is used. In this embodiment, when the tapered portion T is formed, t ′ is 0.0 mm and the angle β is 60 °. Note that the case where β is 0 ° corresponds to the conventional machining blade An shown in FIG.

  Table 1 shows the presence or absence of the taper portion T of each processing blade of the expanding type used in the conventional example and the example of the present invention created in this example.

  In Table 1, machining blade No. Is a number corresponding to n of the machining blades Dn, An, and as described above, in this embodiment, the input side end of the sheet 1 is 1, and the final end on the output side is 29. In Table 1, although it is described as a processing die, it is an abbreviation for an expanding processing die, and what is used in the present invention example is a processing die Da to Dd for convenience, and what is used in the conventional example is a processing die Aa for convenience. , Ab and divided.

(Example 2)
Each processing mold shown in Table 1 and the expanded cutting mold E (same as the expanding cutting mold B) are combined, and each processing mold is reciprocated 1500 times per minute, so that the mesh sheet for the positive electrode and the negative electrode is 100 mm each. The number of breaks and cracks generated in the lattice bones and nodules constituting the mesh was counted. In addition, after confirming the presence or absence of a crack visually, a thing of about 1/3 or more of the thickness of a lattice bone or a nodule part was counted as a crack with a stereomicroscope. Table 2 shows the results of the number of cuts and cracks generated.

  From the results shown in Table 2, it can be seen that according to the expanded mesh processing method of the present invention, the number of cuts in the lattice bones and nodules can be significantly reduced as compared with the conventional example.

  In the present invention, most of the effects can be obtained by forming the taper portion T only on the processing edge D29 at the final end on the sheet output side. This is because the number of cuts and cracks generated in the mesh sheet using the processing dies Db, Dc, and Dd in which the taper portion T is formed other than the processing blade D29 at the final end and the mesh sheet using the processing die Da are compared. it is obvious.

  However, in the mesh sheet Dap using the machining die Da, cracks are generated at one point in each of the lattice bone and the nodule, and the machining blade having the tapered portion T is added to the machining blade D29 at the final end. Obviously, it is more preferable to form the tapered portion T on all the processing blades except the processing blade Dn (n = 28) adjacent to or the processing blade D1.

Further, the difference between the positive electrode and the negative electrode, that is, the difference in sheet tensile strength (positive electrode sheet: 45 N / mm ² , negative electrode sheet: 30 N / mm ² ) is particularly caused in the conventional example by cutting or cracking of lattice bones and nodules. Significantly affects the situation. That is, only using a sheet whose tensile strength is increased from 30 N / mm ² to 45 N / mm ² , the frequency of cutting and cracking increases rapidly. In this invention example, in the case of increasing the tensile strength of the sheet to 45N / mm ² than 30 N / mm ² also, the occurrence of cleavage or cracking is suppressed to a very low frequency.

  In addition, in the case where the conventional processing molds Aa and Ab are used, when the tensile strength of the sheet to be expanded is gradually increased, if the tensile strength is 41 N / mm 2 or more, the lattice bone and the nodule are cut and The occurrence frequency of cracks increased critically. On the other hand, when expanding using the processing molds Da, Db, Dc, Dd used in the present invention, even when the tensile strength exceeds 41 N / mm 2 or more, cutting and cracking of lattice bones and nodules are remarkably suppressed. It was. Therefore, it can be seen that the present invention is more effective when applied to a sheet having a tensile strength of 41 N / mm <2>, which is difficult to expand with such a conventional processing die.

On the other hand, when the Sn and Ca concentrations in the Pb—Ca—Sn alloy are increased and further thermosetting is performed, the tensile strength of the sheet increases. While it is preferable to use a sheet having a high tensile strength in terms of ensuring the strength of the expanded lattice body, the expanding process becomes difficult, and the occurrence frequency of cracks in lattice bones and knots increases. Therefore, even if the configuration of the present invention is adopted, there is an appropriate maximum tensile strength as a sheet. In the separate examination by the present inventors, the maximum tensile strength when using the working die used in the present invention is 55 N. / Mm ² . Therefore, in the present invention, it can be seen that the method of the present invention is preferably applied to a sheet having a tensile strength of 55 N / mm ² or less. Although the processing speed of the expand (the number of reciprocations per unit time of the expand processing mold) is reduced from this example, it is possible to process a sheet having a higher tensile strength, but still 63 N / mm ² or less is practical. It is considered the limit.

  Next, the development width dimension W of the mesh shown in Table 2 was measured every 10 cm for each 100 m sheet, and the standard deviation value σn-1 was measured as a variation in the development width dimension. The results are shown in Table 3.

  From the results shown in Table 3, the standard deviation σn-1 of the mesh development dimension W is smaller in the mesh produced by the method according to the present invention than in the conventional example. It can be seen that the variation in the dimension W can be reduced.

  Further, the standard deviation σn-1 of the development dimension W is closely related to the frequency of occurrence of cutting and cracking of lattice bones and nodules shown in Table 2, and the higher the frequency of occurrence of cutting and cracking, The standard deviation σn-1 of the development dimension W also increases, and the standard deviation σn-1 of the development dimension W tends to decrease as the frequency of cutting and cracking decreases.

  In the present invention, at least the processing edge Dn at the final end of the sheet 1 on the material output side, that is, as shown in FIG. 14 or FIG. The processing blade Dn that forms the grid cell closest to the plain portion 3 or the frame bone 16 formed by the two nodule portions 19b (corresponding to the processing blade No. 29 since n = 29 in this embodiment) By forming the tapered portion T described in the embodiment, the releasability from the expanding blade D of the mesh sheet 13 (comprised of the mesh 12 and the plain portion 3) being processed is remarkably improved. The

  Since the releasability is improved, the mesh sheet 13 is not pulled by the expanding blade D in the process in which the expanding blade D shifts to the top dead center. Since no stress is applied, the stress applied to the lattice bones 17a and 17b, the first knot portion 19a and the second knot portion 19b is reduced.

  In particular, in the conventional method, the first knot portion 8b is bent at approximately 90 ° by the shaping roller 4 to cause cutting or cracking. In the present invention, the first knot portion 8b is provided on the machining blade Dn. Since the bending angle at the first knot portion 19a by the shaping roller 4 is reduced by the action of the taper portion T, cutting and cracking of this portion can be remarkably suppressed.

  In addition, since the pulling amount of the mesh sheet 13 by the expanding blade D is suppressed, the positional deviation between the mesh sheet 13 and the expanding blade D and the expanding die E is suppressed, so that the lattice caused by the positional deviation is generated. Cutting and cracking of bones and nodules are suppressed.

(Example 3)
In Example 3, the positive electrode active material and the negative electrode active material prepared by a known material and method were filled into the mesh shown in Table 3 in accordance with the respective polarities, and cut into a single electrode plate. Thereafter, the developed dimension (W ′ dimension in FIG. 20) of the mesh 12 of each electrode plate after aging and drying was measured, and the variation of the developed dimension W ′ was calculated as the standard deviation σn−1 of W ′. Table 4 shows the calculation results of the standard deviation σn−1 of these W ′ dimensions.

  From the results shown in Table 4, according to the present invention, the variation in the mesh development width dimension W ′ in the electrode plate state is remarkably suppressed as compared with the conventional example, and an electrode plate with excellent dimensional accuracy is obtained. I understand that Further, the standard deviation W of the development width W of the mesh alone without filling the active material and the standard deviation W ′ after filling with the active material, single plate processing and aging drying are almost unchanged, and the electrode plate of the present invention It turns out that the remarkable effect that the dispersion | variation in a dimension can be reduced is acquired.

Example 4
In Example 4, as described above, a lead storage battery (hereinafter referred to as a battery) of 80D26 type was prepared by combining the positive electrode plate and the negative electrode plate obtained by the present invention and the conventional method shown in Table 4. . 7 positive electrode plates and 8 negative electrode plates shown in Table 4 are made into a single cell through a separator, 6 single cells are stored in a battery case, and the cells are connected in series. Then, the battery was assembled, and the diluted sulfuric acid electrolyte was injected and charged. The separator was a microporous polyethylene separator with a negative electrode plate housed in the bag. The combination of the positive electrode plate and the negative electrode plate used for each battery was as shown in Table 5 described later.

  And about each battery shown in Table 5 mentioned later, the high rate discharge test was implemented and the output characteristic was compared. The test conditions were as follows: each battery was adjusted to a temperature of −15 ° C., and discharged at a discharge current of 300 A. The battery voltage at 5 seconds after the start of discharge (discharge voltage at 5 seconds) was used as the output characteristic. The battery obtained by the method and the battery obtained by the conventional method were compared. Since the output is expressed as current × voltage, the output is calculated by the product of 300 A, which is the discharge current, and the voltage at the fifth discharge. In the present embodiment, since the discharge current is constant at 300 A for each battery, the battery output can be compared according to the level of the discharge fifth second voltage. Table 5 shows the positive electrode plate and negative electrode plate used in each battery, and Table 5 also shows the value of the discharge 5 second voltage obtained under the above conditions.

  According to the result shown in Table 5, the discharge 5 second voltage of the batteries J1 to J4 using the positive electrode plate according to the conventional example and the negative electrode plate of the conventional example was 9.20V to 9.24V. Further, the discharge H5 voltage of the batteries H1 to H6 using the positive electrode plate according to the conventional example and the negative electrode plate according to the present invention example is 9.61V to 9.71V, and there is a remarkable increase of 0.4 to 0.5V. The battery output was significantly improved.

  Furthermore, the discharge 5 second voltage of the batteries G1 to G4 using the positive electrode plate according to the example of the present invention and the negative electrode plate according to the conventional example is 9.63V to 9.72V, which is remarkable as compared with the conventional batteries J1 to J4. The degree of increase was equivalent to that of the batteries H1 to H6 of the examples of the present invention.

  Furthermore, the discharge fifth second voltage of the batteries F1 to F6 using the positive electrode plate according to the present invention and the negative electrode plate according to the conventional example is 9.76 V to 9.91 V, and in this embodiment, the highest discharge fifth voltage is. showed that.

  From the above results, it can be seen that the output characteristics during high rate discharge are remarkably improved by using the electrode plate according to the present invention as either the positive electrode or the negative electrode. More preferably, the output characteristics can be further remarkably improved by using the electrode plate of the present invention for both the positive electrode and the negative electrode.

(Example 5)
Next, a life test was performed on each battery shown in Table 5 under the following conditions. In other words, as test conditions, at a temperature of 75 ° C. ± 3 ° C., a fully charged battery is discharged at 25 A with a low current (discharge time 1 minute) and 14.8 V constant voltage charge (maximum charge current 25 A, charge time 10 minutes) The discharge and charge cycles were repeated, and a determination discharge of 582 A was performed every 480 cycles of this cycle, and the number of cycles at the time when the voltage at the 5th second fell below 7.2 V was defined as the number of life cycles.

  In addition, since the actual determination discharge is performed every 480 cycles, the determination discharge at a certain point in time may exceed the voltage of 7.2V in the next determination discharge, although the voltage at the 5th second is higher than 7.2V. It is common. In such a case, in the graph in which the horizontal axis is the number of cycles and the vertical axis is the voltage at the 5th second, the two points sandwiching 7.2V are connected by a straight line, and the number of cycles at which this straight line intersects the 5th second voltage = 7.2V. Is the number of life cycles. Table 6 shows the results of the life cycle number of each battery thus obtained.

  From the results shown in Table 6, the number of life cycles of the batteries J1 to J4 using the electrode plate according to the conventional method for both the positive electrode and the negative electrode was in the range of 4720 cycles to 4800 cycles. On the other hand, the number of life cycles of the batteries G1 to G4 using only the positive electrode by the method of the present invention only for the positive electrode and the negative electrode by the method of the conventional example only for the negative electrode is 6860 to 7160 cycles. In addition, it can be seen that the life characteristics are remarkably improved as compared with the batteries J1 to J4 according to the conventional example using the electrode plate according to the conventional method. This is presumably because the improvement of the voltage characteristics due to the suppression of the cutting of the lattice bone and the nodule portion and the cracks, and particularly the suppression of the cracks, markedly suppressed the lattice corrosion of the positive electrode.

  On the other hand, the life cycle number of the batteries H1 to H6 using the electrode plate according to the conventional method as the positive electrode and the electrode plate according to the method of the present invention as the negative electrode is 5430 to 6020 cycles. Compared to J1 to J4, a remarkable life improvement effect is recognized. However, the degree was small compared to the batteries G1 to G4. The effect of improving the life in the batteries H1 to H6 is largely due to the improvement in the charge acceptance of the battery by improving the current collection efficiency of the negative electrode by suppressing the cutting and cracking at the lattice bone and the nodule portion of the negative electrode. Has no such effect, and corrosion is likely to occur. Therefore, it is presumed that the life improvement effect is lowered as compared with the batteries G1 to G4. Therefore, when applying the method of this invention to any electrode plate, it turns out that it is preferable to apply the structure of this invention to a positive electrode.

  And the life cycle number of the batteries F1-F6 using the electrode plate according to the method of the present invention for both the positive electrode and the negative electrode is 7300-7560 cycles, and the most excellent life characteristics can be obtained in this embodiment. did it. This is because the effect of improving the current collection efficiency of the grid can be obtained in both the positive electrode and the negative electrode, and particularly in the positive electrode, since the generation of cracks is suppressed, the corrosion of the positive electrode grid is suppressed, and the charge / discharge cycle is suppressed. It is presumed that the effect of suppressing the decrease in the current collection efficiency due to this was obtained as a synergistic effect.

  In the present embodiment, an example in which the angle β of the taper portion T of the machining blade Dn shown in FIG. 11 is 60 ° and the tip dimension is 0.00 mm is shown. However, if the durability of the machining blade Dn is taken into consideration, the angle β When β is 5 ° to 65 °, the tip dimension t ′ is preferably set to be larger than 0.00 mm and about 0.5 mm, and the tip dimension t ′ is set smaller than the cutting width G. Is more preferable. In particular, by making the cutting width G larger than the tip dimension t ′, the mesh 12 is more easily developed in the horizontal direction during the expansion process, and the effects of the present invention described so far can be obtained more remarkably. Even if the cutting width G is smaller than the tip dimension t ′, the effect of the present invention can be obtained. Even when the angle β and the dimension t ′ are set in such a range, the effect of the present invention can be remarkably obtained to the same extent as in the present embodiment.

  The present invention suppresses cracks generated in lattice bones and nodules of a lead-acid battery grid to which the reciprocating expansion method is applied, and improves the dimensional accuracy thereof, thereby improving the current collection efficiency and the battery. The output characteristics and the life characteristics are significantly improved, and it is suitable for lead-acid batteries for various uses using electrode plates by the reciprocating expansion method.

The figure which shows the conventional expansion processing type | mold and an expanded cutting type | mold Other diagrams showing conventional expandable mold and expanded cut mold Diagram showing the conventional expanding process Another figure showing the conventional expanding process Figure showing a mesh sheet Diagram showing electrode plate (A) The figure which shows the positional relationship of a mesh and a correction jig (b) The other figure which shows the positional relationship of a mesh and a correction jig The figure which shows the expand processing type | mold and cutting type | mold used for this invention (A) The figure which shows the 1st example of the front-end | tip shape of a processing blade (b) The figure which shows the 2nd example of the front-end | tip shape of a processing blade (c) The figure which shows the 3rd example of the front-end | tip shape of a processing blade The other figure which shows the expand processing type | mold and cutting type | mold used for this invention The figure which shows the expanded processing blade used for this invention, and the cross section of a cutting blade The figure which shows the expand processing process by this invention Another view showing the expanding process according to the present invention The figure which shows the mesh | network obtained by the manufacturing method of this invention The figure which shows the electrode plate using the grid | lattice body for lead acid batteries by this invention. The figure which shows the conventional processing blade and the cutting blade

Explanation of symbols

A Expanding type A1, A2, A3, An-2, An-1, An processing blade B Expand cutting type B1, B2, B3, Bn-2, Bn-1, Bn Cutting blade C Cutting line D Expanding blade D1 , D2, D3, Dn-4, Dn-3, Dn-2, Dn-1, Dn processing blade E Expand processing type E1, E2, E3, En-4, En-3, En-2, En-1, En cutting blade 1Dn 1st side 2Dn 2nd side T taper part 1 sheet 2 mesh 3 plain part 4 shaping roller 4a straightening jig 4b plane part 5 mesh sheet 6 active material 7 pole plate 8 grid 8a grid bone 8b first 1 nodule portion 8c second nodule portion 8d lattice grid 9 frame bone 10 current collecting ear 11 R portion 11 ′ straight portion 12 mesh 13 mesh sheet 14 grid body 15 current collecting ear 16 frame bone 17a (lowermost) lattice Bone 7b grating bones 18a (lowermost) lattice squares 18b lattice squares 19a first knot portions 19b second node 20 plates

Claims (7)

An expanding mold in which a plurality of reciprocating blades are arranged,
Sending a sheet of lead or a lead alloy between the expanded cutting dies in which a plurality of cutting blades are arranged so as to mesh with the expanding mold,
While forming a staggered slit on both sides of the sheet,
The lattice bone formed by the slit is developed in a mesh shape with the expanding mold, the solid portion not forming the central slit of the sheet, a frame bone connected to the lattice bone by cutting, pressing, etc., In the method for producing a grid for a lead storage battery by a reciprocating expand method, forming a current collecting ear connected to the frame bone,
When the distance between the first side surface of the processing blade that faces the cutting blade and the second side surface that is the side surface opposite to the first side surface is the thickness (t) of the processing blade,
At least the processing blade that forms a lattice grid composed of the frame bone, a lattice bone directly connected to the frame bone, and a knot portion of the lattice bone has the thickness (t), Using a taper portion that is thinned toward the tip of the second side surface,
After forming the mesh part, the mesh part and the plain part are bent by a pressure regulating roller, a pressure regulating press or the like so that the mesh part and the plain part are substantially flush with each other. A method for producing a grid for a lead-acid battery. A method for producing an electrode plate for a lead storage battery, wherein an active material is filled in the lattice body obtained by the method for producing a lattice structure for a lead storage battery according to claim 1. A lead-acid battery manufacturing method, wherein the lead-acid battery electrode plate obtained in claim 2 is assembled. 4. The method for producing a lead-acid battery according to claim 3, wherein the electrode plate for the lead-acid battery is used for a positive electrode. Method for manufacturing a grid for a lead acid battery according tensile strength of the sheet in claim 1 which is a ^{41N / mm 2 ~55N / mm 2} . Method of manufacturing a lead-acid battery electrode plate according to the tensile strength of the sheet to claim 2 which is a ^{41N / mm 2 ~55N / mm 2} . Method for producing a lead-acid battery according tensile strength of the sheet to claim 3 or 4 was ^{41N / mm 2 ~55N / mm 2} .

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