JPH0443559A - Manufacturing method of positive electrode plate for lead-acid battery - Google Patents

Abstract

PURPOSE:To prevent the dispersion of battery quality in the manufacture thereof by causing the adherence of a new paper sheet to both sides of a positive plate immediately after a positive grid body is filled with paste, and removing the sheet immediately after pressing the positive plate with a roller. CONSTITUTION:A positive grid body 1 is carried on a conveyor 2 and filled with paste 3 from a hopper 4. Then, when the grid body 1 passes between two pressing rollers 5 and 6, new paper sheets 7a and 9a fed from rolls 8a ad 10b are made to adhere to both sides thereof, and immediately pressed with the rollers 5 and 6. Paper sheets 7b and 9b are removed immediately after pressing, and taken up by the rolls 8b and 10b. Consequently, an amount of water content removed from the paste 3 can be controlled with sheet quality and a pressing force, and can be kept at an optimum value, thereby enabling quality dispersion to be lessened. In addition, a new paper sheet of uniform quality and thickness is always used, and uniform pressing is ensured at all times, thereby making the thickness of a positive plate free from dispersion. According to the aforesaid construction, the dispersion of residual discharge and recovery capacity can be made small.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a positive electrode plate for a lead-acid battery, which is widely used in various industrial fields, and particularly relates to an improvement in the paste filling process.

Although lead-acid batteries have an old history, they are widely used in various industrial fields because of their high energy density and economic efficiency. Recently, manufacturing processes have been increasingly automated, and their performance has improved significantly.

Paste filling of positive electrode plates for lead-acid batteries has conventionally been carried out using an apparatus shown in FIG. That is, the positive electrode paste 1 is placed on the conveyor 12 on which the positive electrode grid body 11 is placed and conveyed.
A hopper 14 for supplying 3 is provided. Further, above and below the conveyor 12, press rollers 17 and 18 each wrapped with felt 15 and 16 are provided. Next, its operation will be explained. The positive electrode grid body 11 is placed on the conveyor 12 and conveyed, and when passing under the hopper 14, the paste 13 is automatically filled and the positive electrode plate 11'
After being pressed while passing between pressing rollers 17.18 wrapped with felt 15.16, the positive electrode plate 11' is conveyed to the next process by the conveyor 12, where it is aged, dried, and chemically formed. Complete.

Problems to be Solved by the Invention In such a conventional manufacturing method of a positive electrode plate for a lead-acid battery, variations in the amount of water removed from the positive electrode paste 13 and the difference in the amount of water removed from the positive electrode plate 11' may occur depending on the condition of the felt 15, 16 wound around the roller. Variations in thickness occur. When a battery is manufactured using such a positive electrode plate 11', there will be large variations in quality such as battery capacity and discharge characteristics.

Means for Solving the Problems In order to solve the above problems, the method for manufacturing a positive electrode plate for a lead-acid battery according to the present invention includes immediately after filling a positive electrode grid with paste, always attaching new paper to both sides of the positive electrode plate, and adding After pressing the positive electrode plate with a roller, the paper is immediately removed from the positive electrode plate.

Function: This method of manufacturing a positive electrode plate for a lead-acid battery reduces variations in the amount of water removed from the positive electrode paste, and also reduces variations in the thickness of the positive electrode plate.

EXAMPLE Hereinafter, a method for manufacturing a positive electrode plate for a lead-acid battery according to an example of the present invention will be described with reference to the drawings.

The paste filling of the positive electrode plate for a lead-acid battery in this example is carried out using the apparatus shown in FIG. In FIG. 1, positive electrode grid body 1
The positive electrode paste 3 is placed on the conveyor 2 on which the positive electrode paste 3 is placed and conveyed.
A hopper 4 is provided for supplying. Furthermore, Himbea 2
Two press rollers 5 and 6 are provided above and below the
On one side above both sides of the upper press roller 5, there is a new paper 7 that is brought into close contact with one side of the positive electrode plate 1' after filling with the paste.
A roll 8a for supplying paper 7a and a roll 8b for winding up the paper 7b removed after pressing the positive electrode plate 1' with the press roller 5 are provided on the other side. Under both sides of the lower press roller 6, similarly to the upper press roller 5, new paper 9 is placed in close contact with the other surface of the positive electrode plate 1' after filling with the paste.
A roll 10a for supplying the paper 9a and a roll 10b for winding up the paper 9b removed after pressing the positive electrode plate 1' with the press roller 6 are provided. Next, its operation will be explained.

The positive electrode grid body 1 is placed on a conveyor 2 and conveyed, and is automatically filled with paste 3 when passing under the ompper 4. Next, when the positive electrode grid body 1 (positive electrode plate 1') filled with the paste 3 passes between two press rollers 5 and 6, new paper 7a is supplied from rolls 8a and 10a to both sides of the positive electrode grid body 1 (positive electrode plate 1'). .

9a is brought into close contact and immediately pressed by pressing rollers 5 and 6. Immediately after pressing, the papers 7b and 9b are removed and wound onto rolls 8b and 10b, and the positive electrode plate 1' is conveyed to the next step by the conveyor 2, where it is aged, dried, and chemically formed.

FIG. 2 shows the change in the amount of water in the positive electrode paste before and after pressing according to this embodiment and the conventional example, that is, the amount of water removed from the paste by pressing. The variation in the amount of water removed from the paste is clearly smaller in the case of this embodiment. Furthermore, since the amount of water removed can be controlled by the paper press pressure, it is possible to always maintain the amount of water removed from the positive electrode paste at an optimum value and reduce variations. on the other hand,
When the conventional paste filling method is used, the water content of the positive electrode paste varies depending on the condition of the felt (number of days of use, etc.).

FIG. 3 shows the thickness of the positive electrode plate after pressing according to the present example and the conventional example. As shown in the figure, the variation in thickness is smaller in the case of this example.

This is because in the conventional example, the dewatering felt wound around the roller is deformed by pressure, and the thickness of the positive electrode plate varies depending on the degree of deformation. In this example, paper quality 1
Since new paper with a uniform thickness is always used, compared to felt, it is always pressed evenly, so it is thought that the thickness of the positive electrode plate does not vary.

FIG. 4 shows the initial capacity of lead-acid batteries using the positive electrode plate manufactured according to this example and the conventional positive electrode plate, the remaining capacity after being left at 40° C. for one month, and the recovery capacity after charging in terms of discharge connection time. All of the supplied batteries have a rated voltage of 2V and a nominal capacity of 1.5Ah (2HR). In addition, the capacitance measurement is 2
0.75A constant current discharge at 5℃, discharge end voltage 175~
! Charging was carried out under the conditions of 245 cm constant voltage (maximum 0.8 A) for 6 hours.

As shown in FIG. 4, the lead-acid battery using the positive electrode plate of this example has a higher initial capacity, residual capacity immediately after being left unused for 40,601 months, and discharge after being left unused compared to the lead-acid battery using the conventional positive electrode plate. There is less variation in the recovery capacity when recharging after charging.

Effects of the Invention As is clear from the description of the embodiments above, according to the method for manufacturing a positive electrode plate for a lead-acid battery of the present invention, immediately after filling the positive electrode grid with the positive electrode paste for a lead-acid battery, new paper is always placed on both sides of the positive electrode plate. By bringing them into close contact and roller pressing, the variation in the amount of water removed from the filled positive electrode paste is reduced.
Furthermore, by reducing the variation in the thickness of the positive electrode plate, it is possible to reduce the variation in the initial discharge capacity of lead-acid batteries using this positive electrode plate, the remaining discharge capacity after being left unused, and the recovery capacity when being recharged after being discharged after being left unused. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a paste filling device for a method of manufacturing a positive electrode plate for a lead-acid battery according to an embodiment of the present invention, and FIG. 2 is a schematic diagram of a paste filling device according to an embodiment of the present invention and a conventional method for filling paste of a positive electrode plate. FIG. 3 is a graph showing the amount of water removed from the positive electrode paste; FIG.
The figure shows the initial discharge capacity of a lead-acid battery using a positive electrode plate according to an embodiment of the present invention and a conventional method for producing a positive electrode plate for a lead-acid battery, the remaining discharge capacity after being left at 40°C for one month, and the recharge after being discharged after being left unused. It is a graph showing subsequent recovery capacity. FIG. 5 is a schematic diagram of a conventional paste filling process for a positive electrode plate for a lead-acid battery. 1...Positive electrode grid body, 1'...Positive electrode plate,
2...Paste, 5.6...Roller,
7a, 9a, 8b. 10b...Paper.

Claims (2)

[Claims] (1) Immediately after filling the positive electrode grid with paste, paper is brought into close contact with both sides of the positive electrode plate, and in addition, after pressing the positive electrode plate with a roller, the paper is immediately attached to the positive electrode plate. A method for producing a positive electrode plate for a lead-acid battery that removes (2) The method for manufacturing a positive electrode plate for a lead-acid battery according to claim 1, wherein the paper brought into close contact with the positive electrode plate is always fresh paper.