What are the repair methods for battery vulcanization?

Several methods of battery vulcanization repair 1) Hydrotherapy For vulcanized batteries, you can first discharge the battery, pour out the original electrolyte and inject a relatively dilute electrolyte with a density below 1.10g/cm3, that is, add water to the battery to dilute the electrolyte. To improve the solubility of lead sulfate. Use a current below 20h, charge for a long time within the range of the liquid temperature not exceeding 20℃～40℃, and finally adjust the electrolyte density in the battery to the standard solution concentration with a slightly higher electrolyte under fully charged conditions, generally vulcanization phenomenon It can be relieved, and the capacity is restored to more than 80%, which can be considered as a successful repair. The mechanism of this method is to reduce the acid density to increase the solubility product of sulfate, and to charge with a small current for a long time to reduce the ohmic polarization to delay the early appearance of the water splitting voltage, and finally to gradually reduce the vulcanization phenomenon in the dissolution and conversion of active substances. Or eliminate. The characteristics of this method are more applicable to water-filled batteries. The serious phenomenon of vulcanization can be treated repeatedly. It can be repaired by itself without investment in equipment. The disadvantage is that the process is too cumbersome to use for sealed batteries. 2) Shallow cycle high current charging method for vulcanized batteries, use high current within 5 hours of current, charge the battery to a slightly overcharged state, control the liquid temperature to not exceed 40 degrees, and then discharge 30%. Repeat this several times to reduce And eliminate the phenomenon of vulcanization. The mechanism of this method is that the overcharged gas is used to slightly wash the surface of the electrode plate with sulfide salt, so that it is desorbed and dissolved and converted into active substances. The characteristics of this method, the slight vulcanization can be obviously repaired. But it is not suitable for old batteries, because the active material of the positive electrode plate is also strongly washed away while the gas is released to wash the sulfate, which makes the active material soft or even fall off. 3) Chemical repair method for vulcanized batteries, pour out the original electrolyte, add pure water, sodium sulfate, potassium sulfate, tartaric acid and other substances mixture, take normal charge and discharge several times, then pour out pure water and add a slightly higher density acid Adjust the acid solution in the battery to the standard solution concentration and restore the capacity to more than 80%, which can be considered a successful repair. According to the mechanism of this method, the added sulfate coordination dopants can form coordination compounds with many metal ions, including sulfide salts. The formed compound is unstable in acidic medium, and the non-conductive vulcanized layer will gradually dissolve and return to the solution, so that the electrode plate is vulcanized, desorbed and dissolved. The characteristics of this method, repair efficiency and efficacy are higher than the previous two repair methods, the shortcomings are too cumbersome. 4) Pulse repair Regarding vulcanized batteries, some special pulse repair instruments can be used to charge and discharge the battery several times to eliminate vulcanization. The mechanism of this method, in terms of solid physics, any insulating layer can be broken down at a sufficiently high voltage. Once the insulating layer is broken down, it will change from an insulating state to a conductive state. If an instantaneous high voltage is applied to the sulfate layer with a large conductance difference resistance value, the large lead sulfate crystal can be broken down. If the high voltage is short enough and the current is limited, the charging current should be controlled appropriately when the sulfide layer is penetrated, so that gas out of the battery will not be caused. The gassing capacity of the battery depends on the terminal voltage of the battery and the size of the charging current. If the pulse width is short enough and the duty cycle is large enough, the simultaneous micro-charging can be too late to form gassing under the condition of ensuring the breakdown of the coarse lead sulfate crystals. , If it contains negative pulse depolarization, it can better ensure that the gas of the electrode plate is separated when the sulfate layer is broken down, so that the pulse elimination sulfide is realized. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How does the lithium battery protection board work?