JPS6251152A - Manufacture of electrode plate for storage battery - Google Patents

Abstract

PURPOSE:To equalize the amount of a pasty active material applied to a porous conductive material by vibrating a slitter plate having a knife edge while applying the paste to the porous material in order to improve the fluidability of the paste. CONSTITUTION:A conductive porous material 4 is passed through a paste container 6 filled with a paste 5 principally composed of cadmium oxide to fix the paste to the porous material 4. Then, a surplus of the paste 5 is scraped off using a slitter 1 having a knife edge to make an electrode plate with a given thickness. During the above scraping, the slitter 1 is vibrated by a vibrator 3 which is attached to a base 2 to which the slitter 1 is fixed in order to increase the thixotropic fluidability of the paste 5. Therefore, a constant amount of the paste 5 can be applied by preventing any nonuniform flow of the paste 5, thereby improving the quality and the production efficiency of the electrode.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a method for manufacturing electrode plates for storage batteries.

Conventional technology Conventionally, as a manufacturing method for storage batteries, such as nickel-cadmium storage batteries, a so-called sintering method has been used, in which an active material is impregnated and retained in the pores of a nickel sintered substrate obtained by sintering carbonyl nickel powder. It was common. however,
This sintered electrode plate requires a very complicated process of creating a nickel sintered substrate and impregnating and retaining the active material.
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Therefore, as a manufacturing method that can simplify the process and reduce costs, a paste-like active material mainly composed of cadmium compounds such as cadmium oxide is applied directly to a core material consisting of a conductive porous body or net. method of drying and fixing,
A so-called paste-type electrode plate manufacturing method has been proposed and is gradually being adopted.

This paste-type electrode plate is mainly applied to a cathode plate because the mechanical strength of the active material layer is weaker and the conductivity of the active material is poorer than that of the sintered-type electrode plate. This paste-type cathode plate is manufactured by kneading an active material mixture whose main component is a cadmium compound such as cadmium oxide with a solution of a binder such as polyvinyl alcohol or carboxymethyl cellulose dissolved in a solvent such as water. The method used is to make a paste and apply it to a conductive porous body or net.

The method of applying the paste is as shown in Figure 2.
After passing the conductive porous body 4 into a paste tank 6 filled with paste 5 to adhere the paste 5 to both sides of the porous body 4, a plate-like body having knife edges (hereinafter referred to as a "slitter") is passed through a paste tank 6 filled with paste 5. ) A method has been proposed in which the excess paste 5 is scraped off to form an electrode plate 8 of a predetermined thickness.

Problems to be Solved by the Invention When the paste 5 obtained by the above method is applied by the method shown in FIG. 2, the resulting electrode plate has a very large variation in the amount of application. For example, in the case of a cathode plate for N120O8O, the width of the electrode plate for one battery is approximately 340 mm, but in consideration of productivity, the width of the electrode plate is approximately 300 m, which is equivalent to 9 batteries. The desired electrode plate is obtained by cutting it to size, but since the amount of coating is controlled by changing the width of slitter 1, only overall control is possible.
- (Due to the small size, there was no way to prevent variations in the amount of coating on the veneer (electrode plates for each battery).

As a result of investigating the causes of variations in the amount of paste applied, it was revealed that the paste flowed unevenly between the slitters due to the low fluidity of the paste. It has become clear that improving fluidity can be expected to be effective in reducing variations in coating amount. Furthermore, it was clearly found that the above-mentioned paste has almost no fluidity, but the fluidity improves when external force such as vibration is applied, which is a so-called chicken-tropic property. Therefore, in the present invention, in order to improve the fluidity of the paste between the slitters 1, application is performed while the slitter 1 is vibrated.

By doing this, the paste is subjected to a vibration action by the slitter L, so its fluidity is improved due to its chicken-tropic properties, and unevenness in the flow of the paste is eliminated, so that the amount of application becomes stable. The vibration conditions are the shape and weight of slitter 1,
It may be determined based on the difference in fluidity due to the difference in paste composition.

Example: The main component is cadmium oxide, and the viscosity is 3.5×to'
CPS paste was applied to a perforated plate 4 with a thickness of 0.1 m and a width of 300 m.

At this time, as shown in FIG. 1, a vibrator 3 (near roller vibrator manufactured by Gabrius) was attached to the slitter fixing table 2, and the coating was performed while vibrating the slitter.

The vibration conditions are determined by the pressure of the air sent to the vibrator 3, but in this experiment, the set pressure L kg /
At cr/l or less, the effect is hardly recognized, and at 2k
G/CRD or higher, the vibration was too strong and problems such as the applied paste dripping occurred, so 1 to 2
kg/ctA.

Effects of the Invention According to the present invention, the fluidity of the paste 5 between the slitter 1 is improved, and the unevenness of the flow of the paste 5 is almost eliminated, so that the coating amount can be made uniform.J-4r h /+-'
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[Brief explanation of drawings]

FIG. 1 is an explanatory view of a main part showing an embodiment of the present invention, and FIG. 2 is an explanatory view of a main part showing a conventional paste-type electrode plate coating method.

Claims (1)

[Claims] A method for producing a storage battery electrode plate, which comprises applying a paste-like active material to a conductive porous body while vibrating a plate-like body having a knife edge.