JPS625562A - Manufacture of plate for lead-acid battery - Google Patents

Abstract

PURPOSE:To manufacture a plate having desired shape and thickness from plates having the same design by filling active material in a cylindrical active material holder, then applying processes of moisture adding, acid absorbing, deforming, and heating. CONSTITUTION:A cylindrical active material holder 2 is formed with porous acid resistant, oxidation resistant cloth or nonwoven fabric made of alkali- containing glass fibers, and a current collector 1 made of a lead alloy is arranged therein. Active material powder 3 such as lead sulfate is filled inside the holder 2 with vibration applied. Then the holder 2 is allowed to stand in a room filled with mist to wet it, and immersed in a dilute sulfuric acid bath to absorb the acid. Before becoming the active material hard, the holder 2 is pressed to manufacture a plate for lead-acid battery. Therefore, the plate having desired shape and thickness is easily obtained, and also filling technique of the active material powder 3 is simplified and a 3.0mm or less thick plate can be easily obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing electrode plates for lead-acid batteries.

Conventional technology In the past, there were different manufacturing methods for lead-acid battery plates, such as paste type and clad type.
- The complexity of the manufacturing process for clad plate plates has been an obstacle to production.

Problems to be Solved by the Invention The present invention aims to improve the productivity of clad type electrode plates and the degree of freedom in the shape of the electrode plates. After filling a cylindrical active material holder with raw material powder, the process of humidification → acid absorption → deformation → heating and leaving is performed to obtain an electrode plate of any shape.

The humidification process ensures the "wetness" of the raw material powder, accelerates the rate of acid absorption in the next acid absorption process, and promotes the permeation of acid toward the center of the cylinder.

In the acid absorption step, lead sulfate is generated in the raw material powder and the raw material powders are rubbed together in a block shape. Further, the lead sulfate produced at this time becomes a nucleus for the growth of basic lead sulfate during the next heating and standing step, thereby improving the strength of the electrode plate or facilitating the progress of chemical formation.

In the deformation process, the raw material powder reacts with sulfuric acid after absorbing acid, and before it completely solidifies (blocks), it is pressurized and deformed into the required shape. can get.

Is the heating and leaving process the lead sulfate generated in the temporary dispensing process? The growth of basic lead sulfate crystals as the nucleus is encouraged. In this step, the raw material powder is bound at the crystal level.

Example An embodiment of the present invention will be fully explained below.

As shown in FIG. 1, an alkali-containing glass fiber current collector 1 (
2.5φ). After that, as shown in @2 Figure I,
Lead oxide (pb
80 wt%) while vibrating θ). Is the packing density 3.2? /cd.

The electrode plate was left in a mist room at 60° C. for 1 hour to humidify the raw material powder. The weight increase force was 1 and the water content was 0.39/cd. After humidification, dilute sulfuric acid (Sp・ar/, olp)
ρ) Immersed in wI for 60 seconds. Next, as shown in FIG. 3, while still wet and not yet hardened, it was rolled and deformed using a press to a thickness of 7 mm and 3.5 mm.

In addition, the diameter of the current collector 1 should be made smaller and the packing density? Needless to say, it can be made even thinner if it is made smaller.

In addition, as shown in Figure 4, the electrode plate 7S with a diameter of 03.5m+, which can have four constrictions like a clad type electrode plate, is left in a room at 40°C for 15 hours to gradually dry. did. The thickness of the electrode plate was almost constant at 3.5±0.1 tea, and the strength of the electrode plate was ensured by the growth of basic lead sulfate. After that, the filling port was sealed, and then an electric current was applied in dilute sulfuric acid to form an anode plate or a cathode plate.

Effects of the invention (1) It has become possible to manufacture an electrode plate of any shape S and thickness using a filled electrode plate of the same design.

(2) It has become possible to industrially produce thin clad plates with a time of 3.0 ms or less, which was previously thought to be impossible due to the difficulty of filling the raw material powder.

(3) It has become possible to manufacture electrode plates that go on curved surfaces other than flat surfaces, making it possible to design cylindrical batteries.

(4) Basic lead sulfate, which grew during heating and standing, facilitated chemical formation. 7. This effect becomes even more pronounced by adding and mixing basic lead sulfate in advance, as shown in FIG.

As mentioned above, the present invention has great industrial value.

[Brief explanation of drawings]

Figures 1 to 4 are (a) of the electrode plate up to the rolling process of the present invention.
Changes in appearance and (b) changes in shape of A-A' cross section? The explanatory diagram shown, Figure 95, shows the chemical formation efficiency with and without the provisional distribution process and with and without the addition of basic lead sulfate (10 wt%) to the raw material powder, in terms of the content of PbO5, which is the product after chemical formation of the anode plate. It is a comparative curve diagram shown. 1 is a current collector, 2 is an active material holder, 3 is raw material powder, 4 is a constriction

Claims (1)

[Claims] 1. A porous acid-resistant/oxidation-resistant woven or nonwoven fabric is formed into a cylindrical shape, a current collector made of lead or a lead alloy is placed therein, and then an active material raw material is filled. , humidification, acid absorption, deformation,
A method for producing electrode plates for lead-acid batteries, which is characterized by processing them in the order of heating and leaving them, and then chemically converting them into electrode plates. 2. The method for producing a lead-acid battery electrode plate according to claim 1, which contains lead sulfate or basic lead sulfate as an active material raw material.