Sulfur removal and repair method for storage battery

At present, battery manufacturers and some professional battery repair manufacturers generally use two methods to repair sulfide batteries: hydrotherapy and high current charging. Hydrotherapy is to add water to the battery to dilute the electrolyte, thus improving the solubility of lead sulfate. However, this method is only suitable for open-cell batteries with rich liquid, and the communication system uses valve-controlled batteries, which is not suitable for hydrotherapy. The high current charging method adopts high current density charging, so that the lead sulfate attached to the electrode surface is crushed and peeled off, and then dissolved in sulfuric acid solution to participate in the chemical reaction, so that the charging can be carried out smoothly and the capacity of the battery can be restored. However, when desulfurization is carried out by charging with high current, there will also be negative effects: polarization and ohmic voltage drop will increase at high current density, and this part of energy will be converted into heat, which will increase the internal temperature of the battery and precipitate a large amount of gas; Especially, a large amount of gas escaping from the positive electrode, its scouring effect is easy to make the active material fall off, causing serious damage to the battery.

Pulse resonance charging technology was originally used by the US military to remove sulfur from the starting battery of tanks, and now it has been successfully converted to civilian use. Using this technology, an online desulfurization maintenance device is developed, which can be used for online desulfurization maintenance of batteries. The principle of desulfurization is: after the molecular structure of the crystal is determined, there is a resonance frequency. Find the resonance point and apply a certain amount of energy to crush it. The resonant frequency of the crystal is related to the size of the crystal. The larger the size, the lower the crystal resonance frequency, and the smaller the size, the higher the crystal resonance frequency. The pulse resonance desulfurization device adopts frequency sweeping technology, which produces positive spike pulse and outputs it to the storage battery, which has resonance effect with lead sulfate crystal. Because the pulse with steep rising edge contains rich harmonics, the harmonics have the characteristics of large amplitude in the low frequency part and small amplitude in the high frequency part, such large lead sulfate crystals can obtain large and small lead sulfate crystals with low energy, and such large lead sulfate crystals and small lead sulfate crystals are more likely to be broken by vibration. From the recrystallization process of crystalline sulfur, it is known that the solubility of small grain size is greater than that of large grain size. In the process of pulse desulfurization and charging, large lead sulfate crystals are gradually broken into small lead sulfate crystals, and the small lead sulfate crystals are gradually dissolved, so that the lead sulfate crystals attached to the battery plate gradually disappear, and the desulfurization effect is achieved. The pulse disturbance during charging destroyed the condition of continuous growth of lead sulfate. As long as the current value is well controlled, the positive plate will not be damaged basically, which is a nondestructive repair technology different from other technologies.