JP2009252432A - Method of cutting lugs of electrode plate group of lead storage battery, and cutting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problem: in a cast-on-strap method and a welding method for forming a shelf portion of an electrode group, irregularity in height between electrode lugs causes nonuniform connections between respective electrode plates and the shelf, which causes a lead to be used more than necessary, so that it becomes necessary to efficiently eliminating a difference in height between the electrode plate lugs. <P>SOLUTION: Lugs of positive electrode plates and/or negative electrode plates making up an electrode plate group are inserted in an interdigital jig to project a row of electrode plate lugs from the jig. The projecting electrode plate lugs are then cut with a cutting blade moving along the top face of the jig in the direction of the row to uniform the height of each electrode plate lug. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cutting method and a cutting device for electrode plate group ears of a lead-acid battery.

  Conventionally, there are a cast-on-strap method and a welding method as a method for producing a group of electrode plates by integrating a plurality of electrode plates having the same polarity at the shelf when manufacturing a lead storage battery. In the caston strap method, an electrode plate group in which a positive electrode plate and a negative electrode plate are aligned via a separator is inverted so that the ear portion is at the bottom, and the tip of the electrode plate ear portion is placed in the mold constituting the shelf portion. This is a method for forming a group of electrode plates by placing and injecting molten lead to solidify.

  In the caston strap method, the connection between the electrode plate ear and the shelf is important, and many of the improvement proposals are solutions relating to the method of processing the electrode plate ear. Patent Document 1 discloses a method for processing electrode plate ears in the Caston strap method. The oxide film is removed from the electrode plate ears by mechanical polishing, and further processed with a reducing flame to form a shelf portion. The contents for improving the bondability are described.

  In the cast-on-strap method, in order to establish a stable construction method, it is possible to control the relationship between the amount of lead at the electrode plate ear in the mold forming the shelf, the temperature and amount of molten lead to be injected, and the temperature of the mold. It becomes important to. Therefore, keeping the height of the electrode plate ears constant when welding the ears of the electrode plate group with molten lead is also one of the elements to be controlled during the integration.

  If the electrode plate ear is short, it cannot be connected unless the ear is in contact with the molten shelf lead, and if the contact between the molten shelf lead and the ear is insufficient, the The board may come off the shelf. In addition, when the electrode plate ears are high, the electrode plate ears contact the bottom surface of the molten mold or reach the vicinity of the bottom surface of the mold, so that the formed shelf becomes a metal crystal structure separated by the electrode plate ears. During use, there was a phenomenon that the portion was corroded and ruptured.

  In order to solve the above-mentioned problem, the amount of lead used in the shelf can be accommodated to some extent by giving a margin in the vertical direction with respect to the amount of lead injected into the mold and the area of the ear so that the shelf becomes thick. In many cases, the battery weight increases and the cost increases.

On the other hand, in the welding method, if the height of the electrode plate ear is low, if the projection of the ear is insufficient on the welding jig, the shelf and the electrode plate ear are unwelded, and conversely When the height is high, the length is longer than the surface of the welding jig, so that the shelf becomes thicker after welding for forming the shelf, resulting in the same problem that the battery weight increases and the cost increases.
JP 2008-47369 A

  However, the conventional method can improve the weldability with the lead alloy part of the shelf by treating the oxide film at the ear part of the electrode plate, but the manufacturing method and manufacturing for making the height of the electrode plate ear part constant The problem of efficiently arranging the difference in height of each electrode plate ear when the shelf portion of the electrode plate group configuration was formed with respect to the equipment remained.

  In order to solve the above-mentioned problem, the invention according to claim 1 of the present invention is a group of electrode plates for a lead storage battery composed of a positive electrode plate and a negative electrode plate. Inserting into a jig and cutting the electrode plate ears protruding in a row from the comb-like jig with a cutting blade that moves the upper surface of the comb-like jig in a row direction The method of cutting the electrode plate ear is shown.

  In the invention according to claim 2 of the present invention, in the electrode plate group in which the electrode plate ear portion is inserted into the comb-like jig, the electrode plate group is tilted or reversed by the cutting blade in the inclined state or the inverted state. The present invention relates to a method for cutting an electrode plate group ear according to claim 1, wherein the ear is cut.

  According to a third aspect of the present invention, there is provided an electrode group for a lead storage battery composed of a positive electrode plate and a negative electrode plate, a comb-like jig for inserting the positive electrode plate and / or the negative electrode plate ear, and the comb A cutting blade that moves in the direction of the electrode tabs protruding in a row on the upper surface of the blade-shaped jig, and the electrode plate protruding from the comb-shaped jig is cut by the movement of the cutting blade. An electrode plate group ear cutting device characterized by the following:

  According to a fourth aspect of the present invention, in the cutting blade that moves on the upper surface of the comb-shaped jig, the tip shape of the cutting blade is on the long side of the electrode plate ear that protrudes from the comb-shaped jig. The electrode plate group ear cutting device according to claim 3, wherein the device contacts with an oblique angle.

  According to the configuration of the present invention, a thin shelf can be formed by efficiently equalizing the height of the electrode plate ear in the electrode plate group welding process of the lead storage battery, and the battery can be reduced in weight and cost. In addition, it is possible to perform welding with high reliability by making the melting margin of the electrode plate ear portion uniform, which is industrially useful.

  An electrode plate group ear cutting device and an electrode plate group ear cutting method according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an explanatory view showing the cutting of the ear portion of the electrode plate group of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA ′ showing the cutting of the ear portion of the electrode plate group in FIG.

  In the electrode plate group 4 in which the positive electrode plate 1 and the negative electrode plate 2 are sequentially stacked with the separator 3 interposed therebetween, the positive electrode ear portion 1a is formed integrally with the upper portion of the positive electrode plate, and the negative electrode ear portion 2a is formed integrally with the upper portion of the negative electrode plate. A plurality of negative electrode tabs 2 a arranged in a line on one side of the plate group are arranged in the gap 5 a of the comb-shaped jig 5. The comb-blade jig 5 is formed by processing a steel plate having a thickness of 5 mm into a comb shape. When the thickness of the negative electrode ear 2 a is 1.7 mm, the gap 5 a is set to 1.9 mm, and the width of the gap is Set slightly larger than the electrode plate ear.

  The configuration of the electrode plate group 4 needs to set the distance between the electrode plates and the electrode plate height accurately. The electrode plate has a predetermined height when the bottoms of the two electrode plates and the separator positions are aligned, but the distance between the negative electrode plate 2 and the adjacent negative electrode plate is the thickness of the positive electrode plate 1 and the separator 3. However, the distance between the electrode plates in a state where the group pressure is applied in the battery is such that the negative electrode ear portion 2a is positioned in the gap portion 5a of the comb blade jig 5 and the shelf portion is connected by welding or the like. Can be obtained.

  In order to arrange the negative electrode tab 2a in the gap 5a of the comb blade-shaped jig 5, the tip 5c is provided at the tip of the comb 5b that keeps the distance between the plates constant, and the adjacent tip 5c ' It is effective to widen the gap so that the negative electrode ear portion 2a is easily extrapolated between the pointed end portion 5c and the adjacent pointed end portion 5c ′, and the negative electrode ear portion is inserted into the gap portion 5a without being caught.

  Since the negative electrode ear 2a is formed of an alloy mainly composed of lead, the hardness is low. When the negative electrode ear 2a is caught between the tip portions 5c and caught in the comb portion 5b, the negative electrode ear 2a is easily damaged and the gap portion 5a. Thus, the cutting stress applied to the gap when the negative electrode ear 2a is cut can be uniformly received together with the comb portion 5b, and cutting failure can be prevented.

  On the upper surface of the comb-shaped jig 5, there are negative electrode ears 2 a arranged in a row and a cutting blade 6 that is pressed rearward by an air cylinder and moves in the row direction of the negative electrode ears. By making the cutting blade 6 into an inclined shape having an inclined portion 6a in the moving direction on the upper surface of the comb blade-shaped jig 5, it is possible to reliably cut the negative electrode ear portions 2a one by one.

  FIG. 3 is an explanatory view showing the cutting of the ear part of the tilted electrode plate group of the present invention. By tilting the electrode plate group 4 fixed to the comb blade-shaped jig 5 and cutting the negative electrode ear part 2a, the ear is cut. The cutting waste 7 can be dropped from the upper surface of the comb blade-shaped jig 5 to the outside. Since the cutting waste 7 cut by the cutting blade 6 is mainly composed of lead and has extensibility, the cutting waste remains as burrs between the cutting blade 6 and the comb blade-shaped jig 5. In the cutting process of the negative electrode ear portion 2a, cutting failure may occur.

  As described above, the residue of the cutting waste 7 on the upper surface of the comb blade-shaped jig 5 and the upper portion of the electrode plate group 4 can be eliminated by inclining the electrode plate group. Here, the inclination of the electrode plate group 4 has been described as the lower left direction, but the same effect can be obtained by inclining in the other direction. The inclination angle of the electrode plate group 4 for reliably dropping the cutting waste 7 needs to be 20 degrees or more, and preferably 30 degrees or more.

  FIG. 4 is an explanatory view showing the cutting of the ears of the reversing electrode plate group of the present invention, and the comb blade-like jig 5 is cut by the cutting blade 6 in a state where the inclination of the electrode plate group 4 is further increased and the electrode plate group is reversed. The cutting waste 7 is dropped downward by cutting the protruding negative electrode ear 2a. By configuring in this way, it is possible to ensure that the cutting waste 7 does not remain in the comb blade jig 5 and the electrode plate group 4.

  FIG. 5 is a top view of the main parts of the comb blade jig and cutting blade according to the present invention, and the negative electrode ear 2a is disposed in the gap 5a of the comb blade jig 5, and the comb blade jig The cutting blade 6 located on the upper right side is formed such that the right side 6b is longer than the left side 6c in the traveling direction. In the cutting blade 6, the tip 6d of the cutting blade is formed at an acute angle at the tip of the right side 6b. The cutting blade 6 has an oblique angle 6e with respect to the long side 2b of the negative electrode ear 2a than the tip 6d. It has a slope 6a.

  The cutting blade 6 does not cut the entire ear portion of the electrode plate at the same time, but gradually cuts the long side 2b of the negative electrode ear portion 2a arranged in a row on the comb blade-like jig 5, so that the cutting is performed. The load can be reduced. When the cutting blade 6 does not have the bevel 6e or when the entire ears of the plurality of electrode plates are cut at the same time, the bending moment of the electrode plate ears may be applied to the cutting edge and the cutting blade may be damaged. In particular, when the distance between the electrode plates is narrow, such a phenomenon is likely to occur when the long side 2b of the negative electrode ear portion 2a is as long as 10 mm or more and when the negative electrode ear portion is as thick as 2 mm or more. Further, due to the presence of the oblique angle 6e of the cutting blade 6, the cutting waste 7 is pushed and moved together with the movement of the cutting blade, so that it can be easily discharged out of the comb blade-shaped jig 5.

  Although the tip 6d of the cutting blade 6 has been described as being on the right side 6b in the direction of travel of the cutting blade that moves on the upper surface of the comb blade-shaped jig 5, it may be arranged on either the left or right side. When the cutting blade 7 is dropped and the cutting waste 7 at the electrode plate ears is dropped, a cutting blade having a shape in which the tip 6d of the cutting blade is located at the upper position with respect to the inclination direction of the electrode plate group is used. Since the portion where the long side 2b of the ear portion is cut last is located in the lower portion in the height direction, the cutting waste 7 is easily dropped by being pushed by the oblique angle 6e of the cutting blade 6.

  By comprising in this way, even if a difference exists in the height of an electrode plate ear | edge part, height can be equalized easily.

  In the description of the embodiment of the present invention, the description has been made in terms of obtaining the uniform height by cutting the negative electrode ear portion 2a with respect to the electrode plate ear portion protruding on the comb blade-shaped jig 5, It goes without saying that the part 1a can be applied to this method and apparatus.

  The present invention can evenly align the heights of the electrode tabs of the electrode plate group of the lead-acid battery, and is extremely effective for reducing the welding quality with high reliability and the weight of the welding shelf, Its industrial value is high.

Explanatory drawing which shows the ear | edge part cutting | disconnection of the electrode group of this invention AA 'sectional view which shows the ear | edge part cutting | disconnection of the electrode group of FIG. Explanatory drawing which shows the ear | edge part cutting | disconnection of the inclination electrode group of this invention Explanatory drawing which shows the ear | edge part cutting | disconnection of the inversion electrode group of this invention The principal part top view of a comb blade-like jig and a cutting blade in the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Positive electrode plate 1a Positive electrode ear | edge part 2 Negative electrode plate 2a Negative electrode ear | edge part 2b Long side 3 Separator 4 Electrode plate group 5 Comb blade-shaped jig 5a Gap part 5b Comb part 5c Pointed part 5c 'Adjacent pointed part 6 Cutting blade 6a Inclined part 6b Right side 6c Left side 6d Tip 6e Bevel 7 Cutting waste

Claims (4)

In an electrode plate group for a lead storage battery composed of a positive electrode plate and a negative electrode plate, the positive electrode plate and / or the negative electrode plate ear is inserted into a comb blade jig, and the protrusion protrudes in a row from the comb blade jig A method for cutting an electrode plate ear, characterized in that the electrode plate ear is cut by a cutting blade that moves the upper surface of the comb-shaped jig in a row direction. In the electrode plate group in which the electrode plate ear portion is inserted into the comb-shaped jig, the electrode plate ear portion is cut by the cutting blade while the electrode plate group is inclined or inverted. The method for cutting an electrode plate group ear according to claim 1. In an electrode plate group for a lead storage battery composed of a positive electrode plate and a negative electrode plate, a comb-like jig for inserting the positive electrode plate and / or the negative electrode plate ear and the upper surface of the comb blade-like jig protrude in a row Cutting the electrode plate ears protruding from the comb blade jig by the movement of the cutting blades. apparatus. In the cutting blade moving on the upper surface of the comb-shaped jig, the tip shape of the cutting blade is in contact with the long side of the electrode plate ear protruding from the comb-shaped jig at an oblique angle. The electrode plate group ear cutting device according to claim 3.

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