JP5088663B2 - Method for manufacturing wound sealed lead-acid battery - Google Patents

Description

  The present invention relates to a method for manufacturing a wound sealed lead-acid battery used for starting an automobile.

  In recent years, lead-acid batteries for automobiles are required to have high output due to an increase in electrical components such as car navigation. Therefore, a wound battery has been proposed for the purpose of reducing the electrode plate and increasing the reaction area. In addition, the maintenance-free sealed type that does not require replenishment is used to appeal to the convenience of users.

  The electrode plate group of such a wound sealed lead-acid battery has a structure in which long positive and negative electrode plates are wound by applying pressure via a separator (or a retainer mat). However, since the electrode plate is thinned and wound under pressure, the positive and negative electrode active materials are separated from the current collector caused by the volume change associated with the charge / discharge reaction of the active material and the crystal growth associated with the charge / discharge reaction. As a result, the positive and negative electrode active materials tend to cause a minute short circuit that penetrates the separator (or retainer mat). In order to solve such a state, a technique for correcting the positional deviation between the electrode plate and the separator as shown in Patent Document 1 has been proposed.

JP 2002-260712 A

  However, in Patent Document 1, in order to increase the length in order to produce a thinner electrode plate, it is necessary to narrow the misalignment allowance, and the feed control between the electrode plate and the separator becomes complicated. is there. Further, Patent Document 1 does not describe a specific method for eliminating winding deviation, and is difficult to reproduce.

  This invention is made | formed in view of the above-mentioned subject, and provides the manufacturing method which prevents the short circuit of a winding type sealed lead acid battery by a simpler method.

  The long positive and negative plates of a wound sealed lead-acid battery are generally pastes to prevent the paste-like active material from falling off the current collectors constituting the electrode plate and to facilitate handling in the battery manufacturing process. A sheet called paper is attached to the portion filled with the pasty active material. The paste paper is made of acid-resistant paper or resin.

In the present invention, the electrode plate width and paste paper width are defined to deal with the above-mentioned problems. Specifically, the width of the paste paper (mm) is w, the width of the electrode plate (mm) is a, and the active material filling width (mm) of the electrode plate is d. Sometimes (d + 2 mm) ≦ w ≦ a is set to make the aforementioned short circuit difficult to occur.

According to the present invention, a wound sealed lead-acid battery can be obtained by a manufacturing method that can flexibly respond to the length and thickness of the electrode plate without applying advanced control to the manufacturing equipment.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to the following Example at all, In the range which does not change the summary, it can change suitably and can implement.

  Examples of the present invention will be described below.

  A coil of a lead-calcium alloy sheet 1a having a thickness of 0.7 mm and a width of 160 mm is set on the primary recoiler 2a shown in FIG. This is unwound by a motor-driven uncoiler 3 (not shown), stopped temporarily, and pressed by a mold 4 engraved with a lattice shape. By repeating this operation at a predetermined feed rate, an alloy sheet 1b in which a predetermined lattice pattern is perforated in the alloy sheet 1a is produced.

  Subsequently, the alloy sheet 1b wound up by the uncoiler 3 is set on the secondary recoiler 2b and placed on the paste filling step shown in FIG. The paste is prepared by kneading a predetermined amount of lead powder, water, dilute sulfuric acid and additives. The positive electrode and the negative electrode differ in the type and composition of dilute sulfuric acid and additives, but the next steps are basically the same. This paste is put into the filling hopper 5 and filled into the alloy sheet 1b by the filling machine 6. At this time, the paste paper 7 (thickness 0.385 mm) is pressure-bonded to the lower side of the alloy sheet 1b by the roll 8a to prevent the paste from dropping to the lower part, and the paste paper 7 is pressure-bonded by the roll 8b after filling. Next, the alloy sheet 1b filled with the paste is cut into a length of 1500 mm by a cutter 9, and at this time, a current collecting tab 10 is formed, and at the same time, an excessive sheet portion is cut out to obtain a long electrode plate 11.

An overview of the electrode plate 11 at this time is shown in FIG. Actually, the paste is filled and the surface is covered with the paste paper 7. However, for the convenience of explanation, a perspective view is shown in order to clearly show the perforation pattern of the lattice. The width of the electrode plate in the winding axis direction (vertical direction in FIG. 3) is a, the paste filling width in the same direction is d, and the width of the paste paper 7 in the same direction is w. In order to prevent the paste from falling off, it is necessary that d ≦ w. Theoretically, d = w saves the paste paper 7 and is efficient. However, for that purpose, if the feeding speeds of the alloy sheet 1b and the paste paper 7 are not accurately synchronized, each may be displaced and pressed. Therefore, it is inconvenient for improving the productivity of the electrode plate. In order to increase productivity, it is sufficient to increase w. However, since the sheet is cut by the cutting machine 9 as described above, even if the width of the paste paper 6 is more than a, it becomes a waste material. Not economical. Therefore, from the viewpoint of productivity and economy, the width w of the paste paper 7 is set to (d + 2 mm) ≦ w ≦ a.

  Table 1 shows trial conditions in which the width of the paste sheet 7 is designed in increments of 1 mm when the width of the alloy sheet 1 b is designed to be 150 mm and the width of the paste filling portion is 145 mm.

これらの条件で合金シート１ｂにペーストを充填し、ペースト紙７を圧着した。Ｎo.１は、
合金シート１ｂの送りをペースト充填機６と制御することでずれることなく圧着できた。前述のようにwがaに近づくほど、ペースト紙７ずれの許容差が大きくなるので、合金シート１ｂの送り速度が向上でき生産性は向上する。

Under these conditions, the alloy sheet 1b was filled with paste, and the paste paper 7 was pressure-bonded. No.1 is
By controlling the feeding of the alloy sheet 1b with the paste filling machine 6, it was possible to press-bond without deviation. As described above, the closer w is to a, the larger the tolerance of displacement of the paste paper 7 is, so that the feeding speed of the alloy sheet 1b can be improved and the productivity is improved.

The above trial was controlled in such a manner that the center line of the traveling direction of the alloy sheet 1b and the center line of the paste paper 7 were matched. However, the center lines do not necessarily need to be matched, and the paste paper 7 only needs to cover the filling portion. For example,
(1) One end of the paste paper 7 is in contact with the lower end of the frame bone on the side of the current collecting tab 10 indicated by the alloy sheet 1b-1, and the other end of the paste paper 7 is indicated by the current collecting tab 10 indicated by the alloy sheet 1b-2. When the opposite side frame is covered (FIG. 4 is a perspective view of the lattice pattern, and the paste paper 7 is indicated by a broken line).
(2) Conversely, when one end of the paste paper 7 is in contact with the upper end of the frame 1b-2 of the alloy sheet and covers the frame 1b-1 of the alloy sheet (FIG. 5)
But the above-mentioned purpose can be achieved.

Next, the positive electrode plate and the negative electrode plate were wound at a winding pressure of 0.7 MPa / cm ² through a glass fiber retainer mat. As described above, since the paste paper 7 was changed, no winding deviation occurred during winding. Since this is a 2V single cell battery, 6 pieces are accommodated in the battery case, the connection between the cells is made, and the lid is welded. Subsequently, dilute sulfuric acid was injected, and a battery case was formed by energization to convert the lead compound paste into an active material, thereby obtaining a 12V wound sealed lead-acid battery.

  These batteries were discharged to a final voltage of 10.5V according to the 5-hour rate capacity test method specified in JIS D5301 and then connected to a resistor, followed by a constant resistance continuous discharge at 1.3A for 4 days, and then a 14.8V constant voltage charge ( 6 hours) was carried out. In this test, a short circuit between positive and negative plates is the main factor of life. Table 2 shows the number of cycles leading to the life of each battery.

表２の結果から、ペースト紙７の幅を増やすことで寿命サイクル数が伸び、耐短絡性能が向上することが分かる。

From the results in Table 2, it can be seen that increasing the width of the paste paper 7 increases the number of life cycles and improves the short circuit resistance.

Explanation of symbols

1a: Lead-calcium alloy sheet 1b: Alloy sheet 2a: Primary recoiler 2b: Secondary recoiler 3: Uncoiler 4: Mold 5: Filling hopper 6: Filling machine 7: Paste paper 8a, 8b: Paste paper roll 9: Cutting machine 10: Current collection tab
11: Electrode plate 1b-1: Frame bone on current collecting tab 9 side 1b-2: Frame bone on the opposite side of current collecting tab 9

It is the schematic which shows the manufacturing process of an alloy sheet. It is the schematic which shows the filling process of an electrode plate. It is the perspective drawing which specified the lattice pattern of the electrode plate. It is an example of the pressure bonding method of an alloy sheet and a paste paper. It is an example of the pressure bonding method of an alloy sheet and a paste paper.

Claims (1)

A wound-type sealed lead-acid battery having an electrode plate group in which a positive electrode plate and a negative electrode plate cut to a predetermined size from a long body having a paste paper adhered to the surface are wound through a separator (or retainer mat) In the manufacturing method, the paste paper in close contact with the electrode plate is cut at the time of the cutting, and the width (mm) of the paste paper is set w as the width in the winding axial direction, and the width of the electrode plate (mm) of a, the electrode plate active material filling width (mm) is taken as d, the production of (d + 2mm) ≦ w ≦ a wound Kaigata sealed lead-acid battery, characterized in relationships and to Rukoto of Method.

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