1, what is vulcanizationThe surface of the battery is attached to the surface of the battery, which is still not capable of reflex the surface of the plate to be converted into the active substance. This is sulfate, referred to as "vulcanization".
2, vulcanization
The battery internal resistance increases, and the voltage of the charging is less than the vulcanization voltage to the charging termination voltage, the larger the current, the more obvious. The acid density is below the normal value. The discharge capacity is lowered, the larger the discharge current, the more obvious the capacity decrease. When charging is generated, bubbles are generated, and the temperature rise of charge is increased, and it can be charged when it is severe.
3, vulcanization generation
Depending on the bisulfate theory of the battery, the battery of the positive and negative electrode plate is converted to the lead of sulfate after each discharge, and the different active substances are reduced from different active materials after charging. And often over-discharge, small current depth discharge, low temperature high current discharge, replenishment is not in time, charging is not sufficient, the acid solution is too high, the internal water is lacking, long-term shelving, the electrode surface of sulfate is excessive and in electrolysis The solution is dissolved, a saturated state, these sulfate particles are fluctuate at temperature, acid concentration, re-crystallization in the surface of the plate. Since the polycrystalline system tends to reduce the results of its surface free energy, the crystal after recombination is increased, and the thickening tendency. Since the lead-soluble electrolyte is a difficult to solve the electrolyte, the recombinant crystal is reduced, and the solubility and dissolution rate in the electrolyte are lowered. The lead of the cells of sulfate hinders the normal diffusion of the battery in the surface and micropores, and the lead-conducting resistance of the sulfate is large, causing the battery in normal charging in normal charging, the concentration polarization increases, and the charging acceptance rate is lowered. When the active substance has not been fully transformed, the polarized voltage has a water decomposition. The battery is rapidly warming so that the charging cannot continue to further and the active material is transformed. Therefore, it has become a cause of reduced capacity and life shortened.
4, how to prevent battery from producing vulcanization
Timely supplementation in time and sufficient electricity, especially when the large current is discharged. When the small current is discharged, the discharge depth is controlled, and the lead in the small current depth discharge is too dense, and the charging is charged to take a small current for a long time. For low temperature high current discharge, it is necessary to take more than 30 percent of the charge to recover capacity. Long-term shelving batteries must first be fully charged and then put on hold, and appropriately supplement every two months.
5, several batteries of vulcanization repair
1) Water therapy
For a vulcanized battery, the battery can be discharged, and the raw electrolyte is poured and the density is injected with a thinner electrolyte of 1.10 g / cm3, i.e., adding the electrolytic solution to the battery to increase the solubility of the sulfate. The current below 20H is used for a long time in the range of no more than 20 ¡ã C to 40 ¡ã C. Finally, the electrolyte density to the standard solution concentration in the battery is adjusted with a slightly high electrolytic solution in the case of sufficient electrolyte. Removed, capacity is restored to more than 80%, which is considered to be repaired.
This method mechanism is used to reduce the solubility of sulfate by reducing the density of the acid solution, and the small current long time is charged to reduce the early appearance of the ohmic polarization delay water decomposition voltage, and ultimately reduce the vulcanization phenomenon in dissolution and conversion into active substances. Or eliminate.
This method is compared to the water storage battery. It can also be repeated for the serious phenomenon of vulcanization, and it can be repaired without an investment equipment. The disadvantage is that the process is too cumbersome to seal the seal battery.
2) Shallow cycle large current charging method
For the vulcanized battery, the battery is used to charge the battery to the battery to charge the battery to a slightly filled state, and the liquid temperature does not exceed 40 degrees, and then discharges 30%, so repeated several times can alleviate and eliminate the vulcanization phenomenon.
This method mechanism is smashed with a slightly sulfide sulfide salt surface surface on the surface of the plate to desolvate and converted into active substances.
This method is characterized by slight vulcanization. However, the old battery is not applicable, since the active material is sucked even when the active material is sucked, while precipitating gas is frushed.
3) Chemical restoration
For the sulfurized battery, pour the raw electrolyte, add pure water to sodium sulfate, potassium sulfate, tartaric acid, etc., take normal charge and discharge, then pour out pure water to add a slightly high-density acid solution to adjust the acid fluid To standard liquid concentration, capacity is restored to 80% or more, it is considered to be repaired.
This method mechanically, the sulfate coordination dopant added, can form a coordination compound with a lot of metal ions, including a sulfide. The resulting compound is unstable in an acidic medium, and the non-conductive sulfide layer will gradually dissolve into the solution, and the plate is escaped.
The characteristics of this method, the repair efficiency and efficacy are higher than the first two repair methods, and the disadvantage is too cumbersome.
4) Pulse repair
For the vulcanized battery, the battery charge and discharge can be eliminated by a number of special pulse repair instruments to eliminate vulcanization.
This method mechanism, from solid, any insulating layer can be broken at a sufficiently high voltage. Once the insulating layer is broken, it will be converted from the insulation state to a conductive state. If the instantaneous high voltage is applied to the sulfate layer having a large conductance difference value, it is possible to break down the large sulfate crystallization. If this high voltage is short enough, it is currently limited, and the charging current is appropriately applied in the case of the vulcanization layer, it will not cause the battery to be paid. The amount of battery deposit depends on the end voltage of the battery and the size of the charging current. If the pulse width is short enough, the duty ratio is large enough, the microconchargeable simultaneous occurs at the same time when it is guaranteed to break through the crude sulfate crystals. If there is a negative pulse to remove polarization, it is more guaranteed to precipitate the gas of the sulfate layer time plate, thus achieving pulse elimination vulcanization.
From atomic physics, the sulfur ions have 5 different levels of energy levels, and ions in the metastable energy level tend to move to a stable covalent health level. In a stable covalent key state, sulfur presents in the form of a ring molecule comprising 8 atoms, the annular molecular mode of these 8 atoms is a stable combination, it is difficult to transition and shattered, the vulcanization of the battery is This stable energy level. To break the structure of these vulcanized layers, it is necessary to provide a certain amount of energy to the annular molecule, which causes the electrons of the outer atom-shaped tape to be activated to the next high energy belt, so that the atoms are released between the atoms. Each particular energy level has a unique resonant frequency. Energy excessive energy outside the resonant frequency will make the atoms of the transition in unstable state, and the low energy is not sufficient to make the atoms from the atomic group, so that the pulse repair instrument is multiple times. As long as there is a resonant to the vulcanized atom, the vulcanization atom can be converted to the free ion dissolved in the electrolyte, and the electrochemical reaction is re-involved, and the active substance is converted under certain conditions.
Article from: http://www.brcpower.co Recommend: LiFePO4 Battery Manufacturer Energy storage battery Manufacturer Integrated machine energy storage battery series Manufacturer Lead lithium battery Manufacturer Outdoor Backup Battery Manufacturer Portable outdoor power supply Manufacturer Power battery Manufacturer Powerwall LiFePO4 Battery Manufacturer Battery rack Manufacturers Telecom LiFePO4 Battery Manufacturer Wall mounted battery storage Manufacturer China Lifepo4 Battery
