JPH0644963A - Paste packing device - Google Patents

Abstract

PURPOSE:To improve the packed condition of paste and lessen the dispersion of packed quantity, by providing a plate exciting the paste by ultrasonic vibration in the this side of a thickness adjusting CONSTITUTION:Paste 4 is pushed in when grid bodies 2, carried on a belt, pass the lower part of a hopper 3, and then the paste 4 is made fluidal by adding supersonic vibration to the paste 4 with an exciting plate 10. When the grid bodies 2 pass between the belt and a thickness adjusting plate 5, electrode thickness becomes constant to regulate paste quantity. Ultrasonic vibration, oscillated from a ultrasonic oscillator 11, makes the paste 4 in vicinity fluidable via the exciting plate 10 to adjust paste packed quantity while pushing the paste 4 in the grid bodies 2, passing under the thickness adjusting plate 5, with it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for manufacturing a paste type electrode plate for a lead storage battery.

[0002]

2. Description of the Related Art A paste type electrode plate for a lead storage battery is a storage battery in which a fixed amount of dilute sulfuric acid having a known concentration is added to a certain amount of lead powder consisting of 60 to 80% lead oxide and the balance metallic lead. It is manufactured by filling the paste in a lead alloy lattice and aging it. A paste filling device that has been conventionally used to manufacture an electrode plate for a lead storage battery is, for example, Japanese Patent Publication No. 40-40928.
As disclosed in the publication, a paste is filled by passing a grid body supplied by a belt conveyor under a hopper equipped with a pair of rolls and a stirrer. The paste filling amount is adjusted by adjusting the thickness of the filled electrode plate at the outlet of the hopper.

As shown in FIG. 4 (A), the electrode plate filled with the paste by this filling device does not sufficiently spread the paste to the surface of the belt side, the grid is exposed from the active material, and the paste filling amount is small. The problem often happened.
Here, FIG. 4 is a cross-sectional view of a main part of the electrode plate, where (A) shows the case where the filled state is not good, and (B) shows the case where the filled state is good. 4 is a paste and 2'is a lattice board.

The above-mentioned problems are likely to occur when the paste is hard, when the grid is thick, or when the grid has casting burrs. This is because ordinary lead-acid battery paste has no fluidity and requires a large pushing force to fill the grid. It is well known that vibration is applied to the paste as a method for changing the characteristics of the lead storage battery paste to improve the filling property.

Such a method of manufacturing the electrode plate for a paste type lead storage battery using vibration is described in, for example, Japanese Patent Application Laid-Open No. 55-81463 and US Pat. No. 3,859,135. In Japanese Patent Laid-Open No. 55-81463, the paste in the reservoir is vibrated to accelerate the flow of the paste and push it out onto the grid, and then the paste supplied onto the grid is vibrated to create the grid. It is described that they are arranged on both sides.

Further, in US Pat. No. 3,859,135, ultrasonic vibration is applied to a paste placed on a grid by a vibrator having a blade-shaped tip to push the paste into the grid while imparting fluidity. It also describes that the electrode plate thickness is specified. However, these methods have drawbacks in that the apparatus becomes complicated or the manufacturing speed becomes slow because the paste has sufficient fluidity.

[0007]

According to the present invention, a paste is pushed from above into a lattice body conveyed on a belt conveyor,
Then, in a paste filling device having a structure in which the amount of paste is adjusted by passing the grid between the belt and a thickness adjusting plate arranged above the belt, ultrasonic vibration is applied in front of the thickness adjusting plate to apply the paste. A vibrating plate is provided, which makes it possible to easily and rapidly manufacture an electrode plate in a good filled state.

[0008]

EXAMPLES The paste filling device of the present invention will be described below based on examples.

FIG. 1 schematically shows a paste filling apparatus according to the present invention. This is because the paste 4 is pushed in when the grid 2 conveyed on the belt passes under the hopper 3, and then ultrasonic vibration is applied to the paste 4 by the vibrating plate 10 to fluidize the paste, The thickness of the electrode plate is constant when the grid 2 passes between the thickness adjusting plate (squeegee) 5 and the paste amount is regulated. Each of the pair of grooved rolls 6 in the hopper 3 is adapted to push the paste 4 downward by rotating in the direction of the arrow in the drawing. Further, the amount of paste can be adjusted by changing the distance between the thickness adjusting plate 5 and the belt by turning the thickness adjusting screw 7. The ultrasonic oscillator 11 has a vibration frequency of 19.3 kHz and an output of 1200 W.
I used the one. Reference numeral 8 is a surface plate, and 9 is a stirring blade.

FIG. 2 schematically shows a thickness adjusting plate of the paste filling device according to the present invention. The ultrasonic vibration oscillated from the ultrasonic oscillator 11 fluidizes the paste in the vicinity through the vibrating plate 10, and the thickness adjusting plate 5 and the contact plate 12 attached to the tip of the paste adjust the lattice 2 passing therebelow. The paste filling amount is adjusted by adjusting the thickness of the filled electrode plate while pushing the paste into. Reference numeral 13 is a buffer plate, and 14 is a mounting member.

Next, a detailed description will be given of a battery test carried out using a Pb-Ca alloy positive electrode grid for a lead storage battery having a thickness of 3 mm, a width of 110 mm and a length of 115 mm. First, when the grid was filled with paste using a conventional filling device, the paste did not sufficiently reach the belt side of the electrode plate as shown in FIG. 4 (A). Next, according to the present invention, filling was similarly performed while ultrasonically vibrating the vibration plate.
The operating conditions of the filling device according to the present invention and the conventional filling device, that is, the rotation speed and the filling speed (20 m / min) of the stirring blade and the filling roll were the same.

As shown in FIG. 4 (B), the electrode plate which was filled with the paste by using the filling device according to the present invention showed a good filling state in which the paste sufficiently reached the belt side of the electrode plate.

Next, an open-type lead storage battery having a 5-hour rate capacity of about 35 Ah was prepared using these electrode plates and subjected to a 5-hour rate discharge repeated test. For comparison, a battery using an electrode plate which was uniformly filled from both sides by hand was also subjected to the test. The transition of the 5-hour discharge capacity during the test is shown in FIG.

Battery No. 1 using an electrode plate that was uniformly filled from both sides by hand. In No. 3, the capacity reached about half of the initial value in about 55 cycles and reached the end of life. On the other hand, the one using the conventional paste filling device (No. 2) has about 25 cycles, and the one using the paste filling device according to the present invention (No. 1).
Had a life of about 65 cycles.

It is generally known that a lead-acid battery using a Pb-Ca-based alloy in the positive electrode grid has a reduced discharge capacity early and a long life after repeated deep discharge. It is said that this is because the vicinity of the interface between the lattice and the active material is preferentially discharged to form a passivation layer, a so-called barrier layer, to inhibit discharge of the active material in other portions. The life of the electrode plate (No. 2) using the conventional filling device was inferior to that of the electrode plate (No. 3) which was uniformly filled by hand, because the latter has an exposed grid. It is considered that this is because the electrolytic solution was likely to penetrate into the interface between the lattice and the active material, and thus the barrier layer was formed earlier than the former. The reason that the electrode using the filling device according to the present invention has the best life performance may be that the lattice was not exposed and the bonding state between the lattice and the active material interface was improved by ultrasonic vibration.

[0016]

As described in detail above, according to the present invention, the paste is pushed into the lattice body conveyed on the belt conveyor from above, and then the lattice is provided between the belt and the thickness adjusting plate arranged on the belt. In a paste filling device having a structure for adjusting the paste amount by passing the body, by providing a plate for ultrasonically vibrating the paste in front of the thickness adjusting plate, the filling state of the paste is good and An electrode plate with little variation in the filling amount can be obtained, and the life value performance of the battery is improved, which is of great industrial value.

[Brief description of drawings]

FIG. 1 is a schematic view showing the structure of a paste filling device of the present invention.

FIG. 2 is an enlarged view of a main part showing a structure of a paste filling device of the present invention.

FIG. 3 is a diagram comparing the results of a 5hR discharge repetition test.

FIG. 4 is a sectional view of the electrode plate showing a filled state of the paste electrode plate.

[Explanation of symbols]

 1 Belt conveyor 2 Lattice body 3 Hopper 4 Paste 5 Thickness adjusting plate 6 Grooved roll 7 Thickness adjusting screw 8 Surface plate 9 Stirring blade 10 Vibrating plate 11 Ultrasonic oscillator 12 Touch plate 13 Buffer plate 14 Mounting bracket

Claims (1)

[Claims] 1. A structure for adjusting the amount of paste by pressing paste from above into a grid body conveyed on a belt conveyor and then passing the grid body between a belt and a thickness adjusting plate arranged above the belt. 2. The paste filling device according to claim 1, further comprising a plate for ultrasonically vibrating the paste in front of the thickness adjusting plate.