Cathode protection-based valve control type lead-acid battery capacity activation solution

Abstract

The invention relates to the technical field of capacity recovery for valve control type lead-acid batteries and is characterized in that the formula comprises the following components by weight percent: 2-5% of sodium sulfate, 2-4% of potassium sulfate, 0.2-0.5% of aluminum sulfate, 1-3% of sodium bicarbonate, 1-2% of ammonium sulfate, 0.5-2% of phosphoric acid, 1-1.5% of sodium pyrophosphate, 0.05-0.15% of citric acid, 0.2-0.4% of ethylenediaminetetraacetic acid disodium and the balance of deionized water. Phosphate ions are fully utilized for protecting a cathode plate of the battery, thereby preventing active substances from being softened and shedding during the high-frequency pulse activation process and reducing the corrosion of a grid alloy; the action of a complexing agent is utilized for leading lead ions in a sulfide crystal to form a coordination compound and be further dissolved; and the action of replacing the lead ions in the sulfide crystal of active metal ions is simultaneously utilized for leading sulfate ions and the lead ions in the crystal to return into electrolyte. Not only can a cathode of the battery be effectively protected during the activation process based on the coaction of the components in the compound, but also the irreversible sulfation can be well eliminated, thereby greatly recovering the battery capacity with failure.

Description

technical field [0001] The invention relates to a valve-controlled lead-acid storage battery capacity activation solution, which belongs to the technical field of storage battery repair. Background technique [0002] Valve-regulated lead-acid batteries are widely used in many fields due to their low cost and maintenance-free advantages. However, after 3 to 4 years of use, a large part of the batteries will be scrapped due to early capacity decay, which causes this phenomenon. There are many reasons, but the most important one is caused by the "irreversible sulfation" of the battery. In order to prolong the service life of the battery and restore the capacity of the battery that failed early, relevant researchers have done a lot of research work for many years. Among them, there are two methods that are reported more, one is to add additives to the electrolyte, such as electrolyte activator, which belongs to the chemical repair method, and the other is to repair with a high-...

AI Technical Summary

Problems solved by technology

It is quite effective in the early stage of repair, but after the battery is used for a short period of time, the capacity of the battery will decay quickly, and the service life will be greatly reduced.

This is because the activators currently on the market have the following defects: 1. The components of the activator contain ions that are unfavorable to the battery, which will destroy the electrolyte environment of the battery, increase the self-discharge of the battery, and affect the normal reaction of the battery.

2. The composition of the activator cannot effectively protect the positive electrode during the high-frequency pulse activation process, resulting in the softening and falling off of the positive electrode plate and the rapid corrosion of the grid alloy, which greatly affects the later capacity and life of the positive electrode of the battery