JP2019033031A - Lattice body and manufacturing method thereof, lead storage battery and manufacturing method thereof - Google Patents

Abstract

To provide a manufacturing method for easily obtaining a lattice body capable of securing the thickness of an ear portion.SOLUTION: A manufacturing method of a lattice body 21 used for an electrode plate of a lead storage battery includes a first step of preparing a lattice body base material having a lattice portion 22 and a protruding portion integrally formed with the lattice portion 22 and protruding from one end of the lattice portion 22 and a second step of folding the protruding portion to form an ear portion 23 having a base portion 23a and a folded portion 23b folded back so as to overlap the base portion 23a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a lattice body and a manufacturing method thereof, and a lead storage battery and a manufacturing method thereof.

  Lead-acid batteries are widely used for industrial purposes, and are used, for example, for automobile batteries, backup power supplies, and main power supplies for electric vehicles. In recent years, the idling stop system car (hereinafter referred to as "ISS car") equipped with a system that stops the engine during power generation control, signal waiting, etc. has been actively studied for the purpose of carbon dioxide emission regulation measures, fuel efficiency reduction, etc. The lead storage battery is also required to have characteristics suitable for ISS vehicle use.

  On the other hand, the electrode plate of the lead storage battery is composed of, for example, a grid formed of a lead alloy and an electrode material held by the grid. In this case, the lattice body has a lattice portion and a portion called an ear portion for current collection that protrudes from the lattice portion, but since the electrode material is not held on the ear portion, the ear portion Is in contact with the electrolyte in an exposed state. Therefore, in the ear portion, deterioration due to the electrolytic solution is more likely to proceed than in the portion where the electrode material is held, and it is difficult to ensure a predetermined thickness. In particular, in a negative electrode plate for a lead-acid battery for an ISS vehicle, a so-called ear-warp that leads to thinning of the ear part is often caused by the fact that the lead-acid battery is often used in a state that is not fully charged (partially charged). It is known that this phenomenon occurs (see, for example, Patent Document 1).

International Publication No. 2010/032782

  With respect to the above-described problem, Patent Document 1 discloses that a lead-tin alloy layer is separately provided on the ear portion of the negative electrode plate. However, providing such an alloy layer separately is the number of manufacturing steps. It is not necessarily practical.

  Therefore, a main object of the present invention is to provide a manufacturing method for easily obtaining a lattice body and a lead storage battery capable of securing the thickness of the ear portion.

  In one aspect, the present invention is a method of manufacturing a lattice body used for an electrode plate of a lead-acid battery, and includes a lattice portion and a protrusion formed integrally with the lattice portion and protruding from one end of the lattice portion. A manufacturing method comprising: a first step of preparing a body base material; and a second step of folding the protruding portion to form an ear portion having a base portion and a folded portion folded back to overlap the base portion. is there.

  In this manufacturing method, the lattice base material has a protruding portion formed integrally with the lattice portion, the protruding portion is folded back, and the ear has a base portion and a folded portion that is folded back so as to overlap the base portion. Forming part. Therefore, it is possible to thicken the ears by a simple method of folding back, and it is possible to obtain a lattice body that can ensure a predetermined thickness even if the ears deteriorate.

  In the second step, the protrusion is preferably folded back in a direction substantially perpendicular to the protrusion direction of the protrusion. In this case, since it can suppress that a lattice base material becomes long in the protrusion direction of a protrusion part, the cost at the time of preparing a lattice base material in a 1st process can be reduced.

  In the second step, the protrusion is preferably folded back in only one direction. In this case, since the number of steps in the second step can be minimized, the lattice body can be obtained more easily.

  In the second step, preferably, the projecting portion is folded back so that the folded portion overlaps the base portion at least at a position intermediate between the base end and the distal end of the base portion. In this case, when the lattice body is used for the negative electrode plate of a lead storage battery for an ISS car, the thickness of the ear portion can be more suitably ensured even at the intermediate position of the base portion where the earburn is particularly likely to occur.

  The manufacturing method preferably further includes a third step of rolling the base portion and the folded portion. In this case, the adhesion between the base portion and the folded portion can be improved, and the intrusion of the electrolyte between the base portion and the folded portion can be suppressed, so that the thickness of the ear portion can be more suitably secured. .

  The lattice body is preferably formed of an alloy containing lead, tin and calcium. A lattice body using this alloy (Pb—Sn—Ca alloy) can improve strength, reduce self-discharge, improve storage characteristics, and the like. It is particularly useful as an electric body.

  In another aspect, the present invention may be a method for manufacturing a lead storage battery, comprising a step of holding an electrode material on the lattice obtained by the above manufacturing method.

  In another aspect, the present invention is a lattice body used for an electrode plate of a lead storage battery, comprising a lattice portion, and an ear portion that is formed integrally with the lattice portion and protrudes from one end of the lattice portion, The ear portion may be a lattice body having a base portion and a folded portion that is folded back so as to overlap the base portion.

  The folded portion may be folded in a direction substantially perpendicular to the protruding direction of the ear portion. The folded part may be folded only in one direction. The folded portion may be folded so as to overlap the base portion at least at a position intermediate between the proximal end and the distal end of the base portion. The base part and the folded part may be rolled. The lattice body may be formed of an alloy containing lead, tin, and calcium.

  In another aspect, the present invention may be a lead storage battery including an electrode plate having the above-described lattice body and an electrode material held by the lattice body.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the manufacturing method for obtaining the lattice body and lead acid battery which can ensure the thickness of an ear | edge part simply.

It is a perspective view showing the whole lead-acid battery composition and internal structure concerning one embodiment. It is a perspective view which shows the electrode group of the lead acid battery shown in FIG. (A) is a front view which shows one Embodiment of the grid body used for the electrode plate of the lead acid battery shown in FIG. 1, (b) is principal part cross section along the IIIb-IIIb line | wire in FIG. 3 (a). FIG. It is a front view of an expanded sheet for demonstrating the manufacturing method of the lattice body shown in FIG. FIG. 4 is a front view of a lattice base material for explaining a method of manufacturing the lattice shown in FIG. 3. 5A and 5B are main part cross-sectional views for explaining a method of manufacturing the lattice shown in FIG. 3, wherein FIG. 6A is a main part cross-sectional view taken along line VIa-VIa in FIG. 5, and FIG. It is principal part sectional drawing which shows the process of subsequent. It is principal part sectional drawing which shows other embodiment of a lattice. It is a front view which shows the principal part of the lattice body for demonstrating the ear | edge part of the lattice body which concerns on other embodiment.

  Hereinafter, embodiments of the present invention will be described in detail.

<Lead storage battery and manufacturing method thereof>
FIG. 1 is a perspective view showing the overall configuration and internal structure of a lead-acid battery according to one embodiment. As shown in FIG. 1, the lead storage battery 1 includes a battery case 2 whose top surface is open and a lid 3 that closes the opening of the battery case 2. The battery case 2 and the lid 3 are made of, for example, polypropylene. The lid 3 is provided with a positive electrode terminal 4, a negative electrode terminal 5, and a liquid port plug 6 that closes a liquid injection port provided in the lid 3.

  Inside the battery case 2, there are an electrode group 7, a positive pole 8 connecting the electrode group 7 to the positive terminal 4, a negative pole (not shown) connecting the electrode group 7 to the negative terminal 5, dilute sulfuric acid, etc. The electrolyte solution is accommodated.

  FIG. 2 is a perspective view showing the electrode group 7. As shown in FIG. 2, the electrode group 7 includes a positive electrode plate 9, a negative electrode plate 10, and a separator 11 disposed between the positive electrode plate 9 and the negative electrode plate 10. The positive electrode plate 9 includes a positive electrode lattice body (positive electrode current collector) 12 and a positive electrode material 13 held by the positive electrode lattice body 12. The negative electrode plate 10 includes a negative electrode grid body (negative electrode current collector) 14 and a negative electrode material 15 held by the negative electrode grid body 14.

  The electrode group 7 has a structure in which a plurality of positive electrode plates 9 and negative electrode plates 10 are alternately stacked in a direction substantially parallel to the opening surface of the battery case 2 via separators 11. That is, the positive electrode plate 9 and the negative electrode plate 10 are arranged so that their main surfaces extend in a direction perpendicular to the opening surface of the battery case 2. In the electrode group 7, the ears 12 a of the positive electrode grid bodies 12 of the plurality of positive electrode plates 9 are collectively welded by the positive side strap 16. Similarly, the ears 14 a of the negative electrode grid bodies 14 in the plurality of negative electrode plates 10 are collectively welded by the negative electrode side strap 17. The positive side strap 16 and the negative side strap 17 are connected to the positive terminal 4 and the negative terminal 5 through the positive pole 8 and the negative pole, respectively.

  Then, the manufacturing method of the lead acid battery 1 is demonstrated. The manufacturing method of the lead storage battery 1 which concerns on one Embodiment comprises the electrode plate manufacturing process which obtains an electrode plate (the positive electrode plate 9 and the negative electrode plate 10), and the assembly process which obtains the lead storage battery 1 by assembling the structural member containing an electrode plate. I have.

  In the electrode plate manufacturing process, for example, for each of the positive electrode plate 9 and the negative electrode plate 10, the electrode material paste (the negative electrode material paste and the positive electrode material paste) is held in the lattice body (the positive electrode lattice body 12 and the negative electrode lattice body 14) ( After filling, an unformed electrode plate is obtained by aging and drying.

  The lattice body may be, for example, an expanded lattice body obtained by an expanding method (details will be described later). The positive electrode lattice body 12 and the negative electrode lattice body 14 may be the same as or different from each other.

For example, the positive electrode material paste is kneaded by adding an additive (short fiber for reinforcing) and water to a raw material of the positive electrode active material (lead powder, red lead (Pb ₃ O ₄ ), etc.) and then adding dilute sulfuric acid. Can be obtained. After this positive electrode material paste is held (filled) in the positive electrode grid 12, for example, it is aged in an atmosphere of a temperature of 35 to 85 ° C. and a humidity of 50 to 98 RH% for 15 to 60 hours, and a temperature of 45 to 80 ° C. By drying for 30 hours, an unformed positive electrode plate is obtained.

  The negative electrode material paste is, for example, dry by adding an additive (carbon material, barium sulfate, reinforcing short fiber, resin having a sulfone group and / or a sulfonate group, etc.) to the raw material of the negative electrode active material (lead powder or the like). After obtaining a mixture by mixing, it is obtained by adding dilute sulfuric acid and water and kneading. After this negative electrode material paste is held (filled) on the current collector, for example, it is aged in an atmosphere at a temperature of 45 to 65 ° C. and a humidity of 70 to 98 RH% for 15 to 30 hours, and at a temperature of 45 to 60 ° C. for 15 to 30 By drying for a time, an unformed negative electrode plate is obtained.

  In the assembly process, for example, an unformed negative electrode plate and an unformed positive electrode plate are alternately laminated via the separators 11, and the ear portions 12 a of the positive electrode lattice body 12 and the ear portions 14 a of the negative electrode lattice body 14 are respectively connected. The electrode group 7 is obtained by connecting (welding or the like) with a strap. This electrode group 7 is arranged in the battery case 2 to produce an unformed battery. Next, after injecting an electrolytic solution (dilute sulfuric acid or the like) into an unformed battery, a direct current is applied to form a battery case. The lead acid battery 1 is obtained by adjusting the specific gravity of the electrolytic solution after the formation to an appropriate specific gravity.

  The chemical conversion conditions and the specific gravity of sulfuric acid can be adjusted according to the properties of the electrode active material. Instead of being performed after the assembly process, the chemical conversion treatment may be performed by immersing a large number of electrode plates after aging and drying in the electrode plate manufacturing process into a chemical conversion tank (tank conversion).

<Lattice body and manufacturing method thereof>
Hereinafter, the lattice bodies (the positive electrode lattice body 12 and the negative electrode lattice body 14) used for the electrode plates (the positive electrode plate 9 and the negative electrode plate 10) of the lead storage battery 1 and the manufacturing method thereof will be described in detail.

  Fig.3 (a) is a front view which shows one Embodiment of a lattice. As shown in FIG. 3A, the lattice body 21 includes a lattice portion 22 and an ear portion 23 that is formed integrally with the lattice portion 22 and protrudes from one end of the lattice portion 22. The lattice body 21 is formed of a lead alloy. The lead alloy may be an alloy containing tin, calcium, antimony, selenium, silver, bismuth and the like in addition to lead. Specifically, for example, an alloy containing lead, tin and calcium (Pb-Sn) -Ca alloy).

  The lattice portion 22 includes an elongated upper frame bone 22a positioned above the lattice portion 22, an elongated lower frame bone 22b positioned below the lattice portion 22 and extending in the longitudinal direction of the upper frame bone 22a, It consists of a lattice bone 22c arranged in a lattice shape between the frame bone 22a and the lower frame bone 22b, and has a substantially rectangular outer shape. The ear portion 23 is, for example, a substantially rectangular plate shape, and protrudes from a part of the upper frame bone 22a upward (on the opposite side to the lower frame bone 22b and the lattice bone 22c) substantially perpendicular to the longitudinal direction of the upper frame bone 22a. Yes.

  FIG. 3B is a cross-sectional view of the main part along the line IIIb-IIIb in FIG. As shown in FIG. 3 (b), the ear portion 23 is formed continuously from the upper frame bone 22a, and has a base portion 23a extending in substantially the same plane as the lattice portion 22, and an upper frame bone so as to overlap the base portion 23a. And a folded portion 23b folded in the longitudinal direction of 22a. In this embodiment, the end 24 of the base 23a and the end 25 of the folded portion 23b are folded back so as to overlap each other, but the end 24 of the base 23a and the end 25 of the folded portion 23b do not have to overlap.

  Then, the manufacturing method of the lattice body 21 is demonstrated. 4-6 is a figure for demonstrating the manufacturing method of the lattice body 21. FIG. In this manufacturing method, first, a lattice base material to be the basis of the lattice body 21 is prepared (first step).

  In the first step, first, an expanded sheet in which lattice bones are formed by stretching in one direction by a so-called expanding method is prepared. 4A and 4B are front views of the expanded sheet. As shown in FIG. 4A, the expand sheet 31 includes an elongated middle bone 32 and a pair of elongated outer bones that extend in the longitudinal direction of the middle bone 32 and are located on one side and the other side of the middle bone 32. 33, and lattice bones 34 arranged in a lattice between each of the intermediate bone 32 and the outer bone 33, and has an elongated rectangular outer shape. The expanded sheet 31 can be prepared by a known expanded sheet system.

  A plurality of lattice base materials are obtained from the expanded sheet 31, and further, the lattice body 21 is obtained from the lattice base materials. The middle bone 32 corresponds to the upper frame bone 22 a and the ear portion 23 of the lattice body 21. The outer bone 33 corresponds to the lower frame bone 22b of the lattice body 21. The lattice bone 34 corresponds to the lattice bone 22 c of the lattice body 21.

  The middle bone 32 has a plurality of holes 32a. Each of the holes 32 a has a substantially rectangular shape including a long side substantially parallel to the longitudinal direction of the middle bone 32 and a short side substantially perpendicular to the longitudinal direction of the middle bone 32. The plurality of hole portions 32 a are arranged in a line at a predetermined interval d along the longitudinal direction of the middle bone 32.

  In the first step, subsequently, a cut is provided in the central bone 32 of the expanded sheet 31. Specifically, as shown in FIG. 4B, in each of the adjacent hole portions 32a and 32a, a first cut portion 32b is provided so as to connect one of the most adjacent corners. At the same time, a second cut portion 32c extending from one corner is provided on the line connecting the other corners among the adjacent corners. In the present embodiment, the second notch 32c has a length (about d / 2) that is about half of the distance d between the holes 32a and 32a. Then, by cutting the expanded sheet 31 at predetermined intervals along the longitudinal direction of the expanded sheet 31, the expanded sheet 31 is separated into a plurality of lattice base materials.

  The step of providing the cut and the step of dividing into pieces may be performed as separate steps, or may be performed as the same step (simultaneously). These steps are performed by, for example, a known punching process.

  FIG. 5 is a front view of a lattice base material obtained by the above-described method. As shown in FIG. 5, the lattice base material 26 includes a lattice portion 22 and a protruding portion 27 protruding from one end of the lattice portion 22. The lattice portion 22 in the lattice base material 26 is the same as the lattice portion 22 in the lattice body 21. The above-described second cut portion 32c is provided at the boundary portion between the protruding portion 27 and the upper frame bone 22a. In the protruding portion 27 of the lattice base material 26, the length in the longitudinal direction of the upper frame bone 22a is longer than that of the ear portion 23 of the lattice body 21 (about twice).

  The manufacturing method of the lattice body 21 includes a second step of folding back the protrusion 27 following the first step. FIG. 6A is a cross-sectional view of main parts along the VIa-VIa line in FIG. As shown in FIG. 6A, a second notch having a length approximately half of the length of the protrusion 27 in the longitudinal direction of the upper frame bone 22a is formed at the boundary between the protrusion 27 and the upper frame bone 22a. A portion 32c is provided. In the second step, the one end side of the projecting portion 27 (the side on which the second cut portion 32c is provided) is folded along the second cut portion 32c (as indicated by the arrow F). In other words, in the second step, one end side of the projecting portion 27 is folded back in a direction substantially perpendicular to the projecting direction of the projecting portion 27 (a direction substantially parallel to the longitudinal direction of the upper frame bone 22a). Thereby, as shown in FIG.6 (b), it wraps so that protrusion part 27 may overlap.

  Preferably, the manufacturing method of the lattice body 21 includes, following the second step, a third step of pressing the folded protrusion 27 by pressing in the direction indicated by the arrow P in FIG. In addition. Thereby, the ear | edge part 23 which has the base 23a and the folding | turning part 23b folded back so that it may overlap with the base 2a is formed (FIG.3 (b)). In particular, when the third step is performed, the adhesion between the base portion 23a and the folded portion 23b is improved in the ear portion 23 of the obtained lattice body 21, and therefore, between the base portion 23a and the folded portion 23b. It is possible to further suppress the penetration of the electrolytic solution and the accompanying deterioration of the ear 23 between the base 23a and the folded portion 23b, and the thickness of the ear 23 can be more suitably secured.

  In the obtained lattice body 21, the thickness X of the lattice portion 22 (upper frame bone 22a) and the thickness Y of the ear portion 23 (FIG. 3B) satisfy the relationship of Y = 2X, for example (the thickness of the ear portion 23). The third step may be performed (rolled) so that the thickness of the lattice portion 22 (the upper frame bone 22a) is twice), or may be simply folded without performing the third step. Good. Alternatively, the thickness X of the lattice portion 22 (upper frame bone 22a) and the thickness Y of the ear portion 23 are preferably X <Y <2X, more preferably 1.2X <Y <2X, and still more preferably 1.5X <. The third step may be performed (rolled) so as to satisfy the relationship of Y <2X, particularly preferably 1.8X <Y <2X. In this case, as described above, the adhesion between the base portion 23a and the folded portion 23b is further improved, so that the electrolyte solution enters between the base portion 23a and the folded portion 23b, and the base portion 23a and the folded portion 23b associated therewith. It is possible to further suppress the deterioration of the ear 23 between the two.

  In the manufacturing method of the lattice body 21 described above, in the first step, the lattice base material 26 having the protrusions 27 formed integrally with the lattice portion 22 is prepared, and in the second step, the lattice base material is prepared. 26, the protruding portion 27 is folded back to form an ear portion 23 having a base portion 23a and a folded portion 23b. Therefore, for example, compared with a conventional method in which an alloy layer is separately provided on the ear portion, the ear portion 23 can be thickened by a simple method with a smaller number of steps. Therefore, even if the ear 23 is deteriorated, the lattice body 21 and the lead storage battery 1 that can ensure the predetermined thickness of the ear 23 can be easily obtained.

  The lattice body 21 and the manufacturing method thereof can be other embodiments besides the above-described embodiment. For example, in the above-described embodiment, the ear portion 23 has the folded portion 23b that is folded only in one direction, but the ear portion is substantially perpendicular to the protruding direction of the ear portion as described below ( You may have the folding | returning part folded back | folded by two directions of one direction (substantially parallel to the longitudinal direction of the upper frame bone 22a) and the other direction which opposes the said one direction. However, from the viewpoint of minimizing the number of steps in the second step and obtaining the lattice body more easily, the ear portion 23 is preferably folded only in one direction as in the above-described embodiment. It has a folded portion 23b.

  FIG. 7 is a cross-sectional view of an essential part showing another embodiment of the ear 23 of the lattice body 21 shown in FIG. In another embodiment, as shown in FIG. 7A, the folded portion 43b of the ear portion 43 is folded from one end side of the ear portion 43 to a substantially intermediate position in the longitudinal direction of the upper frame bone 22a. The first part and the second part folded back from the other end side of the ear part 43 to a substantially intermediate position. The first part and the second part are folded back on the same surface side of the lattice body 21.

  In another embodiment, as shown in FIG. 7B, the folded portion 53b of the ear 53 is folded back from one end side to the other end of the ear 53 in the longitudinal direction of the upper frame bone 22a. It is comprised by the part and the 2nd part folded back from the other end side of the ear | edge part 53 to one end. The first part and the second part are folded back to the opposite side of the lattice body 21.

  In another embodiment, as shown in FIG. 7 (c), the folded portion 63b of the ear portion 63 is folded back to a predetermined position from one end side of the ear portion 63 in the longitudinal direction of the upper frame bone 22a. 1 part and the 2nd part folded back so that it may overlap with a 1st part from the other end side of the ear | edge part 63 to one end may be comprised. The first part and the second part are folded back on the same surface side of the lattice body 21.

  In the manufacturing method of the lattice body 21 shown in FIG. 3, in the first step, one second cut portion 32 c extending from one corner is provided on the line connecting the other corners among the nearest corners. However, in the manufacturing method of each lattice body shown in FIG. 7, in the first step, on the line connecting the other corners among the adjacent corners, the second cut portions extending from the respective corners are 2 Provide one.

  In each of the above-described embodiments, the folded portion is folded in a direction substantially perpendicular to the protruding direction of the ear portion (substantially parallel to the longitudinal direction of the upper frame bone 22a). The folded portion may be folded in a direction substantially parallel to the protruding direction of the ear portion (substantially perpendicular to the longitudinal direction of the upper frame bone 22a). In this case, in the grid body manufacturing method, in the first step, the length in the short direction of the middle bone 32 is increased by the length of the folded portion without providing the second cut portion. Therefore, in the case where the lattice body shown in FIGS. 3 and 7 is manufactured, it is possible to suppress the lattice base material 26 from becoming longer in the protruding direction of the protruding portion 27. When preparing, the length in the longitudinal direction of the central bone 32 of the expand sheet 31 can be shortened, and the manufacturing cost can be reduced.

Alternatively, the folded portion may be folded in a direction other than that described above. FIG. 8 is a front view showing a main part (upper frame bone) of the lattice body for explaining an ear portion of the lattice body according to another embodiment. In this embodiment, the turned-up portion 73b overlaps with the base portion 73a along a straight line L (FIG. 8A) that forms an acute angle (an angle of 90 degrees or less) with the protruding direction of the ear portion 73 (the protruding portion 27). It is folded back (FIG. 8B). In this case, the length d ₇₃ in the longitudinal direction of the upper frame bone 22a of the proximal end of the ear portion 73 after folding is equal to the length d ₂₇ in the longitudinal direction of the upper frame bone 22a of the proximal end of the protruding portion 27 before folding. It is preferable to fold back so that they are substantially the same. Thereby, a lattice body can be used conveniently also in a lead storage battery in which the base end of the ear | edge part 72 deteriorates especially.

  In any of the above-described embodiments, the folded portion is folded so as to overlap the base portion at least at a position intermediate between the proximal end and the distal end of the base portion. Thereby, when the grid body is used for the negative electrode plate of a lead storage battery for an ISS vehicle, the thickness of the ear portion can be more suitably ensured even at the intermediate position of the base portion where the ear burn is particularly likely to occur. That is, each lattice body according to the above-described embodiment is particularly preferably used for a negative electrode plate of a lead storage battery for an ISS vehicle. Moreover, in each lattice body according to the above-described embodiment, since the thickness of the lattice portion can be reduced and the ear portion can be increased, particularly in the lead storage battery for an ISS vehicle, only the ear portion of the negative electrode plate is increased. As a result, the resistance can be reduced, and as a result, the voltage characteristics can be improved.

  DESCRIPTION OF SYMBOLS 1 ... Lead storage battery, 9 ... Positive electrode plate (electrode plate), 10 ... Negative electrode plate (electrode plate), 12 ... Positive electrode grid body (grid body), 13 ... Positive electrode material (electrode material), 14 ... Negative electrode grid body (grid body) ), 15... Negative electrode material (electrode material), 21... Lattice body, 22... Lattice portion, 23... Ear portion, 23 a.

Claims (14)

A method of manufacturing a grid used for an electrode plate of a lead storage battery,
A first step of preparing a lattice base material having a lattice portion and a protrusion formed integrally with the lattice portion and protruding from one end of the lattice portion;
And a second step of forming an ear having a base and a folded portion folded back so as to overlap the base by folding the protrusion.   The manufacturing method according to claim 1, wherein, in the second step, the protruding portion is folded back in a direction substantially perpendicular to a protruding direction of the protruding portion.   The manufacturing method according to claim 1 or 2, wherein, in the second step, the protrusion is folded back only in one direction.   4. The projecting portion according to claim 1, wherein in the second step, the protruding portion is folded back so that the folded portion overlaps the base portion at least at a position intermediate between a base end and a distal end of the base portion. Manufacturing method.   The manufacturing method as described in any one of Claims 1-4 further provided with the 3rd process of rolling the said base and the said folding | turning part.   The said lattice body is a manufacturing method as described in any one of Claims 1-5 currently formed with the alloy containing lead, tin, and calcium.   The manufacturing method of a lead storage battery provided with the process of hold | maintaining an electrode material in the grid | lattice obtained by the manufacturing method as described in any one of Claims 1-6. A grid used for an electrode plate of a lead storage battery,
A lattice part,
An ear portion formed integrally with the lattice portion and protruding from one end of the lattice portion,
The said ear | edge part is a grid | lattice body which has a base and the folding | turning part folded back so that it might overlap with the said base.   The lattice body according to claim 8, wherein the folded portion is folded in a direction substantially perpendicular to a protruding direction of the ear portion.   The lattice body according to claim 8 or 9, wherein the folded portion is folded only in one direction.   The lattice body according to any one of claims 8 to 10, wherein the folded portion is folded so as to overlap the base portion at least at an intermediate position between a base end and a distal end of the base portion.   The lattice body according to any one of claims 8 to 11, wherein the base portion and the folded portion are rolled.   The lattice body as described in any one of Claims 8-12 currently formed with the alloy containing lead, tin, and calcium.   A lead acid battery comprising an electrode plate having the grid body according to any one of claims 8 to 13 and an electrode material held by the grid body.

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