JPS59230259A - Manufacture of plate for pocket type alkaline storage battery - Google Patents

Abstract

PURPOSE:To prevent coming off of active material and provide a high performance plate for pocket type alkaline storage battery by placing a nickel fiber sinter filled with active material between a square plate-shaped nickel plated plates with fine holes and fixing the circumference. CONSTITUTION:A steel plate is formed in a square plate shape and a large number of fine holes are installed thereon and nickel plating is applied on it. Slurry state active material 5 is filled in nickel fiber sinter or nickel plated iron fiber sinter having a fiber diameter of 4-100mu and a porosity of 80% or more and dried. The active material filled sinter is placed between two square plates and they are pressed and the circumference is fixed by spot welding to form a plate. By this plate, electrical capacity is increased and filling density of active material is increased and thickness of plate is also decreased.

Description

[Detailed Description of the Invention] As a method for manufacturing electrode plates for nickel-cadmium batteries, (1) Sinter set: impregnating a nickel powder sintered body with a solution of a salt of an active material and then neutralizing it with an alkaline solution. thing.

(Two-pocket type: A narrow box-shaped pocket with many elementary pockets filled with active material hydroxide or oxide in dry powder form.

(6) Paste type: The active material hydroxide or oxide is kneaded with an appropriate solvent to form a slurry, which is then applied onto a steel plate, wire mesh, or fiber sintered body after drying.

etc. The sinter set is used in small sealed storage batteries or open batteries for high rate discharge. The pocket type is used for open type batteries for medium and low rate discharge. The paste type is extremely inexpensive and has already been used in small closed-circuit batteries. However, open type batteries, which contain a large amount of electrolyte and generate a large amount of gas upon charging, are not used because their active materials tend to fall off and their lifespan is short.

An object of the present invention is to obtain an overall inexpensive and high-performance pocket alkaline storage battery by improving paste-type electrode plates.

Conventional pocket alkaline storage batteries have an anode plate and a cathode plate with a thickness of about 1. A hole is made in an OH band steel strip with a width of 8 to 20 ff using a special roll or a reciprocating needle, and then nickel plated, formed into a long pocket-shaped container using a roll, etc., and the powdered active material is placed in it. After filling, a plurality of these pocket containers are fitted together, pressed and cut to a predetermined size, and the grid and plate lugs are attached to form the plate.

The reason for using a steel strip having a narrow width of 8 to 20 ff is to make the filling amount of the powder active material uniform, to improve the current collection efficiency, and to increase the mechanical strength. However, manufacturing of the electrode plate requires a large number of blank pockets, and the fitting process is time-consuming, resulting in very low production efficiency. Paste-type electrode plates have the disadvantage that the active material easily falls off, but they also have good charging and discharging characteristics, and unlike powder filling methods, they are manufactured by applying a viscous slurry-like active material to the electrode plate. Therefore, it is easy to equalize the filling amount. Furthermore, since it is possible to continuously manufacture wide electrode plates, it is possible to prevent the active material from falling off when it is sandwiched between plate-shaped steel plates with many pores on the surface, which is the case with paste-type plates. . Furthermore, it is possible to obtain an inexpensive and high-performance pocket type electrode plate.

An explanation will be given below based on one embodiment of the present invention.

FIG. 1 is a plan view of a conventional pocket-type electrode plate, in which 1 is a plain pocket filled with a powdered active material, 2 is a perforation, 3 is a grid, and 4 is an electrode plate lug.

FIG. 2 is a partial cross-sectional view of a conventional pocket electrode plate. 5
is the filled active material. FIG. 3 is a plan view of a pocket type electrode plate according to the present invention, where 1' is a single pocket plate, 2 is a perforation, 3' is a spot weld, and 4 is a plate lug. FIG. 4 is a partial cross-sectional view of a pocket electrode plate according to the present invention, and 6 is a nickel-plated iron fiber sintered body.

In order to compare the performance of the pocket-type electrode plate according to the present invention and the conventional pocket-type electrode plate, the outer size of the conventional electrode plate was 10.
2flX 154fl\thickness 1.7fi perforation rate 14%,
A capacitor having a capacity of 6 Ah at a discharge current of 0.2 CtA was used. The electrode plate according to the present invention has an outer diameter dimension, a surface porosity,
The active material filling amount was exactly the same.

First, 90% cadmium oxide and 10% nickel powder are thoroughly mixed, and then 8% ethylene glycol is added and mixed to form a slurry. Thereafter, a sheet of nickel-plated iron fiber sintered body having a porosity of 90% is passed through this slurry and adjusted to a thickness of about 1.5 mm using a slitter. Thereafter, it is pre-dried for about 1 hour in a hot air drying oven at 60 to 80°C to obtain a semi-dry electrode plate.

Next, it was compressed to 1.4ff using a press. Ethylene glycol is completely removed from this paste-type electrode plate at 200 to 250°C. Cut this into 100H x 151fl,
0.12W steel plate 102fiX 154ff depth 1. O
Make a square plate of ff and make 14 pores of 0.25ffφ on the surface.
% open area.

Next, two nickel-plated perforated steel plates are sandwiched together, the periphery is spot welded, and the outer diameter and thickness are 1
．． A 55 fit electrode plate was obtained. The reason why the fiber diameter must be 4 to 100 microns and the porosity must be 80% or more is due to the following reason.

5- If the fiber diameter of the fibrous body used here is 4μ or less, it is unsuitable because it is too thin and sufficient strength cannot be obtained. or,
If it is 100μ or more, it is too thick and a sufficient fiber surface area cannot be obtained, resulting in poor current collection efficiency. Furthermore, if the porosity of the sintered body is not 80% or more, the amount of active material filled will be small and the required electric capacity will not be obtained. Next, a capacity test was conducted to compare the performance of pocket electrode plate A according to the present invention and pocket electrode plate B of the conventional method. In the capacity test,
Two pocket-type anode plates having a capacity sufficient for the cathode capacity were used, the cathode plates to be tested were inserted between the anode plates via a separator, and a potassium hydroxide aqueous solution having a specific gravity of 1.20 was used. The test conditions were charging 0.10AX15H.

Discharge skin 2CA, final voltage 1. An alternate charge/discharge test was conducted with Ov. The test results are shown in FIG. As is clear from FIG. 5, the pocket-type electrode plate according to the present invention has a capacity increased by about 20% compared to the conventional pocket-type electrode plate.

The reason for this is that the conventional electrode plate is filled with powder, which uses powder with a relatively large particle size, resulting in a large number of voids and poor contact between the living matter and the thickness of the plate. This is due to the increase in thickness. On the other hand, since the electrode plate of the present invention can use a relatively fine active material, the packing density can be increased and the electrode plate can be made thinner. Furthermore, this is because it contains a metal fiber sintered body with good electrical conductivity.

It goes without saying that the electrode plate of the present invention can be applied not only to the negative electrode plate but also to the nickel hydroxide active material of the positive electrode plate.

As described above, the pocket cathode plate according to the present invention has a simple manufacturing process and can provide an extremely high-performance electrode plate, which has great industrial value.・

[Brief explanation of drawings]

FIG. 1 is a plan view of a pocket type electrode plate according to a conventional method. FIG. 2 is a partial cross-sectional view of a pocket-type electrode plate according to the conventional method. FIG. 3 is a plan view of a pocket-type electrode plate according to the present invention. FIG. 4 is a partial cross-sectional view of a pocket-type electrode plate according to the present invention. FIG. 5 is a capacity test characteristic diagram. 1... Plain pocket 2... Perforation 6... Grid 4... Plate lugs 5... Filled active material 1'... Pocket plate 3'... Spot welding 6
...Nickel-plated iron fiber Suspended applicant Yuasa Battery Co., Ltd. Figure 1

Claims (1)

[Claims] A steel plate is formed into a rectangular plate shape using a press, etc., and a large number of pores are formed on the surface. Nickel fibers with a fiber diameter of 4 to 100μ and a porosity of 80% or more are placed between the two nickel-plated rectangular plates. A compact or nickel-plated iron fiber sintered compact is filled with a slurry-like active material, the dried active material-filled fiber body is sandwiched, pressed and caulked once, and the electrode plate is fixed around the periphery by spot welding. A method for producing electrode plates for pocket-type alkaline storage batteries.