JPH05205738A - Manufacture of paste type anode plate for sealed alkaline storage battery - Google Patents

Abstract

PURPOSE:To improve the filling density and the capacity by transferring the paste type active material, which is mainly composed of nickel compound and which includes the carbon fiber, to a base body intermittently, and thereafter, pressing the base body evenly with roller press of two or more stages. CONSTITUTION:A steel plate having a round hole is used as a base body 3, and the paste type active material 2, which is obtained by mixing nickel plated carbon fiber and the nickel compound, is filled from a hopper 6 to a roll 1' having a recessed part 5. This is transferred to the base body 3 moved by a backup roll 1'', and furthermore, this base body 3 is pressed for molding in order till a predetermined thickness between two-stage roller press 7. Thereafter, the paste type active material 2' is similarly transferred to the opposite surface for molding. This molded base body 3 is dried, and furthermore, it is press molded till a predetermined thickness to obtain a plate. The filling density of the active material and the capacity of a storage battery can thereby be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a paste type anode plate for a sealed alkaline storage battery.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a paste type anode plate for a sealed alkaline storage battery, Japanese Patent Publication No. 52-18379 has been used.
There is a method disclosed in the publication. As shown in FIG. 2A, the paste-like active material 2 is provided between the pair of rolls 1.
And by continuously supplying the substrate 3, one surface of the substrate 3 is filled with the paste-like active material 2 to form a sheet-like electrode plate. As shown in FIG. ′ And a sheet-shaped electrode plate are continuously supplied between a pair of rolls 1 ′, the paste 2 ′ is formed into a sheet on the other surface of the substrate 3, and at the same time, the paste 2 ′ is applied to the substrate 3 and the paste-shaped active material 2, 2 is formed on both surfaces. The electrode plate 4 filled with 'was manufactured. Also,
In order to improve the capacity density, the electrode plate 4 is generally dried and then pressed to a predetermined thickness.

[0003]

However, in the above-mentioned conventional manufacturing method, when the paste-like active material 2 containing fibers such as carbon fibers is filled in the substrate 3 at a predetermined density, the paste-like active material 2 is obtained. Since the viscosity of the paste is low and the fluidity of the paste-like active material 2 in the traveling direction of the substrate 3 by the roll 1 is low, the pressure on the substrate 3 becomes high and defects due to the deformation of the substrate 3 occur to complete the electrode plate. I can't do that.

Therefore, a method may be considered in which the viscosity is lowered by increasing the mixed liquid of the paste-like active material 2 and then the mixture is filled, but since the fluidity is high, the density becomes low at the time of filling. If the filling amount is kept constant, the electrode plate after filling becomes thicker, so that the compression rate becomes higher when forming by the press after drying, and the base 3
Defects occur due to peeling of the active material from the. Therefore, there is a problem that the filling density cannot be improved after the electrode plate is completed because the filling amount cannot be set to a certain amount or more.

An object of the present invention is to provide a positive electrode plate having a paste active material mainly composed of a nickel compound containing a fiber such as carbon fiber and a base for an alkaline storage battery, which has a high packing density. It is to provide a large capacity electrode plate.

[0006]

In order to solve the above-mentioned problems, the present invention provides a paste-like active material mainly containing a nickel compound contained in fibers such as carbon fibers for the purpose of improving conductivity and reinforcing electrode plates. It is characterized in that after the substance is intermittently transferred to the substrate, it is uniformly formed into a predetermined thickness by a one-stage or two-stage or more roll press.

[0007]

According to the present invention, in order to transfer the paste-like active material to the substrate intermittently, when the paste-like active material is formed by one-stage or two-stage or more roll-pressing, the paste-like active material is compared with the case of continuous transfer. Therefore, it is possible to obtain an electrode plate having a high density and a large capacity, without being restricted by other paste-like active material, easily extending backward in the traveling direction of the substrate, without deforming the substrate.

[0008]

EXAMPLE An example of the present invention will be described. A steel plate having a circular hole (thickness 0.08 mm) was used as the substrate 3, 2% by weight of nickel-plated carbon fiber, and H ₂ O in a mixed solution of 23.
As shown in FIG. 1, a roll 1 ′ having a recess 5 is filled with a paste-like active material 2 mixed with a nickel compound in an amount of 6% by weight from a hopper 6. Here, the recesses 5 had a depth of 5 mm, a width of 10 mm, and an interval of 10 mm.

The paste-like active material 2 filled in the recess 5
Is transferred to the moving base body 3 supported by the backup roll 1 ″, and is further formed into a predetermined thickness between the two-stage roll presses 7, and one surface of the base body 3 is filled with the paste-like active material 2. After that, the opposite surface of the substrate 3 is also filled with the paste-like active material 2'in the same manner as described above. Then, the electrode plate is dried and press-molded to a predetermined thickness to obtain an electrode plate (electrode plate A according to the present invention). 1% peeling failure after drying
The electrode plate was manufactured by the conventional method by lowering the viscosity as follows. (Conventional electrode plate B) At this time, the mixed liquid H ₂ O is
It was made to be 35.0% by weight. The composition of the paste-like active materials 2 and 2'after drying is the same as that of the electrode plate A according to the present invention.

The electrode plate A according to the present invention manufactured in this way
And the conventional electrode plate B were cut into a size of 40 × 90 mm for 10 sheets, and the result of comparing the average values of the packing densities of the paste-like active materials 2 and 2 was combined with a cadmium electrode to form an AA alkaline storage battery. Table 1 shows the results of comparing the discharge capacities at the 10th cycle.

[0011]

[Table 1]

As shown in Table 1 above, it was confirmed that in the electrode plate A according to the present invention, the packing density and capacity of the active material were improved.

In the embodiment of the present invention, the two-stage roll press 7 is used for forming the thickness, but it is needless to say that the roll press having one or more stages can be formed to a predetermined thickness. Is.

[0014]

As described above, according to the manufacturing method of the present invention, the paste-like active material mainly containing a nickel compound containing fibers such as carbon fibers for the purpose of improving the conductivity and reinforcing the electrode plate is intermittent. Since it is decided to uniformly form the film with a predetermined thickness by one-stage or two-stage or more roll press after it is transferred to the substrate, compared with the conventional method of continuously transferring and filling between a pair of rolls. , The packing density of the electrode plate after drying and pressing was improved from 2.9 g / cm ³ to 3.1 g / cm ³ , and the capacity was increased from 820 mAh to 895 mAh.
Excellent in packing density and capacity.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a manufacturing process in a method of manufacturing a paste type positive electrode plate for a sealed alkaline storage battery according to the present invention.

FIG. 2 is an explanatory view showing a manufacturing process in a conventional method for manufacturing a paste-type positive electrode plate for a sealed alkaline storage battery,
(A) shows a case where a sheet-like electrode plate is prepared by filling one surface of a substrate with a paste-like active material, and (b) shows a sheet-like electrode plate obtained by filling one surface and an opposite surface of the substrate with a paste-like active material. The case is shown.

[Explanation of symbols]

1'is a roll, 1 '' is a backup roll, 2 is a paste-like active material, 3 is a substrate, 5 is a recess, 6 is a hopper, and 7 is a two-stage roll press.

Claims (2)

[Claims] 1. A method for producing an anode plate, comprising a substrate and both surfaces of which are filled with a paste-like active material containing organic fibers and mainly composed of a nickel compound, wherein the paste-like active material filled in the recesses provided in the roll is A method for producing a paste-type positive electrode plate for a sealed alkaline storage battery, which comprises intermittently transferring to a substrate and then forming it to a predetermined thickness with a one-stage or two-stage or more roll press. 2. A paste-like active material in a hopper is filled in recesses provided intermittently on the outer circumference of the roll, and the filled paste-like active material is transferred to a substrate to be transferred at a position corresponding to a backup roll. The method for producing a paste-type positive electrode plate for a sealed alkaline storage battery according to claim 1, wherein.