RU2718955C1 - Method of producing a workpiece of a positive electrode of prismatic chemical current sources - Google Patents

Abstract

FIELD: electrical engineering.SUBSTANCE: invention relates to the field of electrical equipment, namely to the method of manufacturing workpieces of a positive electrode for prismatic chemical current sources. Disclosed method of producing a positive electrode of a lithium chemical current source, comprising a titanium current collector with a grid, two electrodes with active mass based on manganese dioxide, deposited on opposite sides of the grid, includes preparation of active mass plates, applying plate active mass on the grid, followed by a double compression at pressure 41–62 MPa (410–620 kgf/cm) for 10–30 seconds with intermediate drying at temperature of 100–120 °C for 2–4 hours and heat treatment at temperature 230–250 °C for 1–1.5 hours.EFFECT: high density of the active mass of the positive electrode and high electrical and mechanical characteristics thereof is the technical result of the invention.1 cl

Description

The invention relates to the field of chemical current sources and relates to a method for manufacturing positive electrode blanks for prismatic chemical current sources.

A known method of manufacturing a manganese dioxide electrode for a chemical current source (patent for the invention of the Russian Federation No. 2145456, publ. 02.10.2000) by pressing an active mass consisting of manganese dioxide, carbon black and fluoropolymer impregnated with an organic solvent onto a perforated metal collector and subsequent heat treatment finished electrode, characterized in that the electrode mass is formed from the active mass, dried from an organic solvent in air, and pressed onto a perforated metal coll Torr produce specific pressure 500 - 1000 kgf / cm ² for 10 - 50 seconds.

When implementing this method, it is impossible to achieve a high density of the active mass of the positive electrode, which in turn leads to a decrease in the electrical characteristics of manganese dioxide current sources. In addition, according to the method, it is possible to produce only single electrodes, which reduces productivity in serial production.

An object of the present invention is to provide a positive electrode with improved electrical and mechanical characteristics.

The technical result of the claimed invention consists in the continuous monitoring of the parameters of the electrode blanks, which makes it possible to produce blanks with precisely defined electrical and mechanical characteristics.

The claimed technical result is achieved due to the fact that the method of manufacturing a positive electrode of a lithium chemical current source containing a titanium collector with a lattice, two electrodes with an active mass based on manganese dioxide, deposited on opposite sides of the lattice, includes preparing active mass plates, applying active plates mass on the grate, and in accordance with the invention, application of active mass on the grate plates occurs by double pressing at a pressure of 41-62 MPa (410-620 kgf / cm ²⁾ for e 10-30 seconds with intermediate drying at a temperature of 100-120 ° C for 2-4 hours and heat treatment at a temperature of 230-250 ° C for 1-1.5 hours.

To implement the proposed method, the installation for receiving cards is used, consisting of the following nodes:

- node receiving tape active mass;

- rolling unit;

- drying unit;

- calibration unit;

- cutting unit.

Prepare the installation for work. By rotating the handwheel, a gap between the rollers is established to obtain a tape with a thickness of 2.2-3.2 mm. Pour gasoline-solvent into the feeder tank. Granules of a previously prepared active mass pre-prepared on the basis of manganese dioxide are unloaded from the container into the hopper of the dispenser.

They include an installation for producing an active-mass tape and make a tape with a thickness of 2.2-3.2 mm. In the process of manufacturing the tape control the quality of impregnation with gasoline-solvent granules. The tape should be elastic, with smooth edges, without tears and holes.

Prepare a rolling device. The rotation of the handle sets the gap between the rollers to obtain a tape with a thickness of 1.8-2.35 mm.

Turn on the device and roll the tape of the active mass. The thickness of the tape should be 1.8-2.35 mm. After rolling, the tape is passed through the guide coils for drying and calibration operations.

Prepare the installation of drying for work. Turn on the installation. The temperature on the surface of the drying devices should be 75-125 ° C.

Fill the tape of the active mass in the drying device. Lay the tape on the guide reel, and then on the moving drying devices. Send the tape to the calibration setup.

Calibration rollers are prepared having a sample in the middle for calibration and trimming of the active mass tape. By rotating the handwheel, the gap between the rolls is 0.4-0.7 mm.

Turn on the installation and calibrate the tape of the active mass. The tape thickness should be 1.4 ± 0.1 mm.

Cut the edge of the tape with a knife and tuck it between the feed and pressure rolls of the cutting machine.

Turn on the cutting machine. Cutting the tape into plates and stacking them in the foot occurs automatically. The number of plates in the foot is not more than 10 pieces.

Periodically, every 100-120 plates, the overall dimensions of 2-3 plates are monitored.

Two plates are placed in each cell of the cartridge.

Place the cassette with the plates in a cold or preheated to a temperature of 80 ° C electric furnace.

Dry the plates at a temperature of 60 to 90 ° C for at least 3 hours. The damper in the exhaust pipe must be open.

At the end of the drying time, the cassettes with plates are removed from the oven and cooled to room temperature.

Spread the distribution of the plates into groups by weight from 54.0 to 62.0 g through each gram.

Install a lattice with a titanium down conductor in the welding fixture and conduct resistance welding in accordance with the technical documentation.

Groups of plates are completed in pairs so that the total mass of two plates per electrode is 114-120 g.

Place the grate on a vinyl-plastic plate covered with a tissue napkin, and apply glue, prepared on the basis of carboxylmethyl cellulose, on the grating on both sides with an even layer with a brush.

Stack the active mass plate, lattice, second plate in series in the mold matrix and close it with a punch. The active mass plates are laid in the mold as follows: the plates, upper and lower, must lie tightly (without a gap) to all four sides of the mold matrix. The top plate should completely cover the grill.

An electrode is pressed, the total mass of the plates of which is 114 - 120 g, at a specific pressure of 41 - 62 MPa (410 - 620 kgf / cm ² ) for 10 - 30 s. An electrode is removed from the mold.

Place electrodes in the cassette in the amount of 15 pcs. and set in a cold or preheated to a temperature of not higher than 100 ° C electric furnace.

Dry the electrodes at a temperature of 100 - 120 ° C for at least two hours. In this case, drying is carried out with a purge of the furnace chamber: the flap in the exhaust pipe must be open.

Electrodes are heat treated at a temperature of 230 - 250 ° C for (60 ± 5) minutes. The damper in the exhaust pipe must be closed.

Cool the oven to a temperature not exceeding 100 ° C in the instrument. The damper in the exhaust pipe must be open. Purge for at least 10 minutes.

Remove the cassettes with electrodes from the oven and cool to room temperature.

An electrode is placed in the mold matrix and closed with a punch.

The electrodes are pressed at a specific pressure of 41-62 MPa (410-620 kgf / cm ² ) for 10-30 s. An electrode is removed from the mold.

Claims (1)

A method for manufacturing positive electrode blanks of a prismatic chemical current source containing a titanium down conductor with a grating, two electrodes with an active mass based on manganese dioxide, deposited on opposite sides of the grating, including preparing active mass plates, applying active mass plates to the grating, characterized in that the active mass plates on the grate are double pressed at a pressure of 41-62 MPa (410-620 kgf / cm ² ) for 10-30 seconds with intermediate drying at a temperature of 100-12 0 ° C for 2-4 hours and heat treatment at a temperature of 230-250 ° C for 1-1.5 hours.