JPS58147963A - Electrode plate for lead storage battery - Google Patents

Abstract

PURPOSE:To enhance the close contact between long fibers and an active material by heating and kneading an original mixture material which is composed of a conductive resin, a minute powder of a noble metal or an oxide of a noble metal, and a plasticizer, and after that, eluting or extracting the plasticizer so as to give a porosity to the long fibers, being followed by adding the long fibers to a paste. CONSTITUTION:After polyacrylonitrile (30wt%), silver powder (10wt%) and petroleum oil (60wt%) are heated and kneaded with a mixer or the like, the mixture is subjected to extrusion molding so as to obtain long fibers of about 3 denier. Next, a plasticizer contained in the fibers are extracted by ultrasonic waves in a trichloroethylene solution. Thus obtained synthetic fibers are used after being cut into a length of about 1-3mm.. Since thus prepared fibers have irregular surfaces due to the adherence of silver powder, and since an active material enters the fibers due to the porosity of the fibers, the intensity of the active material is considered to be widely increased. As a result, generation of failures caused during assembly of a battery is reduced, the life of the battery is extended by decreasing the separation of the active material, and any defective starting which might be caused by undercharging is prevented.

Description

[Detailed description of the invention] The present invention relates to improvements in electrode plates for lead-acid batteries.

Conventional MP b-3b, Pb-Ca The active material of the lead-acid battery plate used as the substrate contains a thick layer to prevent the active material from falling off during the plate manufacturing process, battery assembly process, and during battery use. Acid-resistant synthetic fibers with a diameter of 2 to 6 denier and a length of 0.5 to 4 mm are added. However, since this synthetic fiber has a smooth surface, it has poor adhesion to the active material and is not sufficiently effective. Also, recently automatic 1
- With lead-acid batteries for cars, due to the increase in the number of automobile parts, the load on the battery is large, and many cars that run inside the car have trouble starting due to insufficient charging.

In view of the point L, the present invention aims to improve the adhesion between the added fiber and the active material, reduce the falling off of the active material, reduce the occurrence of defects in the manufacturing process, and extend the battery life. ,
In addition, by reducing the resistance of the living matter, the battery can be charged more efficiently in a short time, thereby reducing startup failures due to insufficient charging and extending the life of the battery.

Next, the present invention will be explained in detail.

Polyacrylonitrile (30% by weight) Silver powder (1
(0% by weight) and heterolium oil (60% by weight) are heat-kneaded in a mixer or the like and then extruded to obtain long fibers of about 3 denier. Thereafter, the plasticizer in the fibers was ultrasonically extracted in a trichlorethylene solution.

The synthetic fibers obtained in this way are cut into lengths of approximately 1 to 3 mm 2
- Cut and use.

The fiber thus produced was actually added to an N502 type electrode plate to produce an electrode plate and a 2-electrode Ih, and a test was conducted. Figure 1 shows the amount of active material falling off when the electrode plate 1 after chemical formation is dropped from a height of 50 mm (front and back alternately from a plate).The results show that the fibers of the present invention have uneven surfaces due to silver powder adhesion. In particular, it is thought that the strength of the active material was greatly improved because the active material penetrated into the material because it was porous.No. 2 is a conventional electrode plate.

Fig. 2 S A E life test (14.8V setting) It can be seen that there is less deterioration during the 10 cycle and the charge is longer than the conventional product 4.

As described above, the present invention has great industrial value, such as reducing the occurrence of defects during battery assembly, extending the lifespan by reducing active material falling off, and eliminating startup failures due to insufficient charging.

[Brief explanation of drawings]

Figure 1 is a comparison diagram showing the active material falling off when the electrode plate is dropped from 50 (-m).
It is a curve diagram showing high rate discharge performance at 25° C. during the E life test. patent applicant

Claims (1)

[Claims] A lead-acid battery characterized by heating and kneading raw materials consisting of a conductive resin, a fine powder of a noble metal or an oxide of a noble metal, and a plasticizer, then eluting or extracting the plasticizer to maintain porosity, and adding long fibers to the paste. Plate for use.