CS248975B1 - The method of impregnating the source electrode - Google Patents

Abstract

The method of impregnation of the source electrode solves the problem of incorporating unformed electrodes into an electrochemical current source and their formation simultaneously with the first charging of the source. The essence is the surface application of a suspension of pulp and/or its components or derivatives, containing 5 to 100 g of substance per liter of liquid.

Description

The invention relates to a method of impregnating electrodes of electrochemical current sources, in particular lead accumulators. At present, the electrodes produced are not pre-formed or pre-formed prior to formation, or this modification is only sporadic. It is known from the literature to treat the electrodes with impregnation with petroleum products, which subsequently burn up in the drying tunnel, or to reinforce the electrode surface layers with an ammonium carbonate solution which is sufficient to ensure sufficient subsequent drying. the strength of the electrode surfaces while maintaining their wet core needed for maturation. These methods assume the subsequent maturation and molding of the electrodes before the final assembly into the accumulators.

The disadvantage of the above mentioned processes is the necessity of forming electrodes in the form of two-electrodes or cells prior to their final assembly into the accumulators, or the reduction of the functional parameters of the batteries in the electrode molds in the welded and assembled batteries.

In this case, the classical formation is only a direct power consumption of about 50 KWh per 1 000 pcs of electrodes and a need of 0.2 worker, which is not a negligible item for daily production of the order of 100,000 electrodes per manufacturer. In addition, additional energy is required to heat the hall, lighting, washing and the like.

The above drawbacks are overcome by the method of impregnating the source electrode according to the invention, wherein a suspension of pulp and / or its component (s) containing 5 to 100 g of substance per liter of liquid is applied to the electrode surface of the electrochemical current source. The advantage of impregnating the source electrode according to the invention is the possibility of incorporating it into an electrochemical source of current in a non-oriented state and the possibility of forming it simultaneously with the introduction of the source into its life (with its first charging, while the charge required for its first charge is sufficient to form it in preserving the source's functional parameters.

In the laboratory tests of impregnated electrodes, the performance test parameters achieved ranged from 97 to 115% of the values achieved on the untreated electrodes, while saving electricity and seven technological operations. EXAMPLES Example 1 EXAMPLE 1 325 g of carboxymethylcellulose are swelled in 8 liters of deionized water at 40 DEG C. for 4 days. The liquid is passed through a mesh of about 2 inch diameter and the electrodes of both polarities are wetted into the filtrates and allowed to drip. After the electrodes are dried at 40 to 60 ° C, they are placed in the maturing area at a temperature of about 20 ° C and a relative humidity of about 95% for a period of 3 days. The electrodes to be heated are assembled into cells and accumulators, filled with electrolytes and charged. to 80 hours of flow I = 0.02 C20 Example 2

Liter of concentrated ethyl alcohol is mixed with 1 liter of deionized water and 20 g of collodion cotton. After 24 hours, both polarities are projected and applied to the electrode surface with a squeegee. The electrodes are dried in a continuous tunnel at 40 to 90 ° C for 2 to 7 minutes to a water content of 5 to 7% and placed in the maturation area as in the previous example; the next procedure is the same. In both examples, the tests were conducted with lead-acid electrodes, but the use is also possible with other electrodes.

Since the coatings applied in both examples are tacky, the electrodes may advantageously be provided with beads having a flow rate of about 70 g / cm @ 2 and the drying of the paste. the type essential increases the life of the battery electrode. The functional filamentous & phlegthalter can be enhanced using a suitable conditioned electrolyte.

In the laboratory examination of the impregnated electrodes, there is a closure that the impregnating film has a positive effect on the electrodes in the sense that it reduces the possibility of sulphation. The use of an envelope that is very simple, since the applied coating is tacky, acts very favorably in the flexible definition of the intermediate electrode distances and allows for the use of thinner and hence faster separators, while at the same time increasing the battery life.

Claims (1)

SUBJECT A method of impregnating a source electrode, characterized in that a pulp suspension and / or components or derivatives thereof containing 5 to 100 g of substance per liter of liquid is deposited on the electrode surface of the electrochemical current source.