METHOD FOR RECYCLING NEGATIVE ELECTRODE PLATE OF WASTE LEAD-ACID POWER BATTERY

摘要

A method for recycling negative electrode plates of waste lead-acid power batteries: connecting each waste lead-acid battery in series; adding dilute sulfuric acid into each battery; charging the waste lead-acid batteries with regulated electrolyte with desired specific gravity in pulse charging mode to recover the battery negative electrode capacities to initial capacities partly or totally; discharging the batteries in constant current, and recording the present capacities of the negative electrode plates of the batteries; weeding out the unrecoverable negative electrode plates based on the present capacities, and classifying other negative electrode plates into several groups based on the present capacities; cutting the negative electrode plates from the bus bar of the batteries group by group and drying them; choosing matching positive electrode plates according to the present capacities of each group of negative electrode plates, and lengthening the length of the tabs of the dried negative electrode plates to accord with the length of the tabs of the positive electrode plates; preparing a complete negative plate assembly through the bus bar by burn-welding or cast-welding; then preparing a new lead-acid battery with the negative plate assembly and the positive plate assembly composed of the matching positive electrode plates. The beneficial effects of the invention are as follows: recovering the capacities of the recycled batteries, classifying the negative electrode plates in different capacities so as to conveniently choose the corresponding positive electrode plates to match the negative electrode plates, and forming batteries with reasonable design. Simultaneously, the negative electrode does not need an antioxidative treatment, thus extra waste water or spent acid does not occur in the invention.