Brief analysis of battery fault diagnosis and elimination

Troubleshooting and battery troubleshooting 1. Plate vulcanization failure phenomenon: After long-term under-charge or discharge, after long-term storage, the plate will gradually appear a layer of white coarse-grained lead sulfate. This substance is not easy to dissolve and recover during normal charging. This substance collectively blocks the pores of the electrode plate and hinders the penetration of electrolyte, resulting in a decrease in capacity, an increase in internal resistance, and a significant decrease in starting charging performance. When charging, the charging voltage and electrolyte temperature increase abnormally, and bubbles appear prematurely, but the new density of the electrolyte liquid phase is slower. When discharging, the voltage drops rapidly. Important reasons: due to the long-term storage of the battery without charging, lead sulfate is precipitated from the electrolyte, so that the plate is vulcanized; the electrolyte content in the battery is too low, the upper plate is attacked and oxidized, and local vulcanization is formed; the concentration of the electrolyte is high or electrolysis Liquid impurities and drastic changes in temperature will also promote the formation of vulcanization. Problem cleaning: If the battery is not seriously cured, it can be charged by curing charging; if it is charged with a fast charger, it has a significant effect on eliminating vulcanization. In severe cases, pour out all the battery electrolyte, pour it in with distilled water, wash it several times, and then add distilled water. The liquid level should be 10-15mm higher than the plate. According to the battery model, the first charging cycle is 1/4 current for charging. When the relative density is 1.15, it is necessary to refill distilled water or electrolyte with a relative density of 1.05. Density is no longer added. Finally, pour out the electrolyte and replace it with the specified value of electrolyte. According to the normal charging method, the battery will have enough power and can be used. If necessary, remove the electric board, remove the frost on the electric board, clean the electric board and the baffle with distilled water, put in the accumulator, and then dispose of it according to the treatment method. 2. The phenomenon of self-discharge problem: After the battery is left for a few days, it will be in no-load state, the storage capacity will decrease, or even no electricity. Important reasons: The electrolyte contains too many impurities (such as copper, iron, etc.), the electrolyte concentration is too high or the battery is not clean, if the electrolyte is spilled on the cover, the positive and negative columns will leak, which will cause the battery to discharge. Cleaning problem: The electrolyte must use special acid and distilled water batteries, never use industrial sulfuric acid or tap water; the container for the electrolyte must be acid-resistant materials, and the electrolyte must be well maintained to prevent dirt from falling. The battery liquid hole cover should be tightly covered to prevent impurities from falling into it; clean the dirt on the battery cover with clean water and keep it dry. A battery with severe self-discharge can be completely discharged or over-discharged, so that the impurities in the dish enter the electrolyte, and all the electrolyte is poured out. The battery is injected with distilled water, cleaned many times, and finally new electrolyte is added and recharged. 3. Many active materials have fallen from the plate. Symptoms: The active material is important to correct the lead dioxide dropped on the electric plate. When charging, there are brown substances in the electrolyte from the bottom to the outside. Important reason: high current overcharge. Overcharging will cause electrolysis of water, which will produce a large amount of hydrogen and oxygen. When hydrogen rushes out of the pores of the negative plate, it will cause the active material to fall off. High electrolyte density, low temperature and high discharge current will accelerate the decline of active materials. Cleaning problem: After the battery is over-discharged, pour the electrolyte, pour the battery with distilled water, clean it several times, then add the electrolyte and charge. If the electrolyte is found to be dark brown, indicating that there is excess sediment, the plate should be replaced. 4. Internal short circuit fault: the open circuit voltage of the battery is too low, the starter is weak, or the voltage drops rapidly when starting; during the charging process, the electrolyte phase density of the battery rises slowly, there are few bubbles, the temperature rises quickly, and the voltage is low. Some pictures and content of the published article are from the Internet. If there is any infringement, please contact to delete the previous article: How to choose a high-quality lithium battery?