Wednesday, December 29, 2010

【 Weak current College 】 battery curing and damage characteristics 】



1. What is the battery curing?
Generated on the plate white crystalline solid lead sulphate, while charging, it is very difficult to translate into active substances of lead sulphate, which is the lead sulfate salinity, hereinafter referred to as a "cure." Generate this kind of lead sulphate crystals main reason is been discharge or discharge after long-term placement, lead sulfate particles in electrolyte is solubility, saturation, these lead sulfate when the temperature is low, while the ReCrystallize in Crystal precipitation when lead sulfate. This precipitation particles once again and as a result of temperature changes in growth, development, increase the crystalline grain. This lead sulfate resistance of the electrical conductivity of the bad, and the large, solubility dissolved speed and very small charge recovery difficult. Thus became the capacity reduction and shortened life expectancy.
2. generate the sulfide cause?
Normal lead-acid batteries in the discharge form lead sulphate, while charging, it was relatively easy to revert to lead. If the battery is used and maintained properly, for example often charge less or discharge, negative will gradually form a thick hard lead sulfate. This lead sulfate charging with conventional methods it is difficult to restore requires charging voltage is very high, since charging is the ability of charging acceptability is poor, large amounts of precipitation. This phenomenon often occurs in the negative, is referred to as irreversible sulphation. It caused a decline in battery capacity, or even become a battery life of the main reasons for termination.
It is generally believed that this is not reversible sulphation due to lead sulfate large recrystallization, crystallization after Solubility decreases.
Lead sulfate crystals of recrystallization of the larger, is due to the tendency of polycrystalline lines and reduce their surface free energy results. From crystallization of regularity, small Crystal size larger than the solubility of the solubility of large Crystal size. Therefore, when long filling or discharge, there are a large number of lead sulphate, sulphuric acid concentration and temperature fluctuations, individual lead sulfate crystals can attach small crystals dissolved while growing up.
3. battery damage of sulfide?
Minimal battery curing, degrade battery capacity, the battery is increasing, serious, and not the electrode degradation into electricity. Minimal battery curing, some methods are available to restore, serious with General charging method is not able to restore capacity.
4. battery characteristics of sulfide?
Vulcanization of battery the most obvious external feature is the internal resistance of the battery capacity drops, increase. Of course, if the battery water loss and positive plate softening also has this characteristic. Identify the battery is curing methods, often using pulse-manage the restoration Miriam on battery to pulse repair if size increase is curing, if not a little capacity increase, the battery capacity drops may be other reasons.
5. remove the battery and curing methods have the following, specifically:
1) large current charging repair
If the absorption is Kraft cause you can charge high current density (up to 100mA/c © o). In this current density, anode can achieve very negative potential value, away from zero point of charge so that φ φ-(0) 8-0, changed the electrode surface live symbol, surfactant desorption occur, particularly on the anionic surface active substances, this harmful surfactant from electrode surface desorption, it can make the charge. At present, almost no one uses this approach to irreversibility sulphation, may be considered for the following: high current density increasing polarization and ohm voltage drop, this part of the energy into heat, so that the battery internal temperature rise, while at the same time, there is a wide range of gas separation, especially large amounts of gas emission gases as cathode, its role is easy to make the erosion of the active substance. But this disadvantage is it is easy to cause water loss, but also easy to make some could fix the battery in high current charging process plates are breakdown, causing unnecessary trouble. To fix the rate and effectiveness.
2) pulse repair
According to atomic physics and solid-state physics principles, sulfide has 5 different-level State, usually in a metastable state of ion energy level tend to move with the most stable Covalent-level. In the lowest-level (i.e. the covalent bond-level State), sulfur to have 8 atomic molecular forms of existence of the ring, the ring of eight Atomic molecular model is a combination of stability, it is difficult to break, the formation of the battery is not intended to be Kraft: curing. Many times this happens, they formed a layer as similar and insulating layer of lead sulfate. To break the shackles of sulphate layer, it is necessary to enhance energy levels of atoms to a certain degree, this time in the outer zone of Atomic and electron is activated to the next higher band lifted between the atoms. Each specific energy level has a unique resonance frequencies must be provided to some of the energy that we can make is activated a molecule move to a more high-level State, too low energy cannot achieve transitions needed energy requirements, however, too much energy would have been away from the shackles and transition of the atom is in an unstable state, and had returned to its original level. In this way, must pass through multiple resonance, making one out of bondage, reaching most active level status without the drop to the original level. This transformation is dissolved in the electrolyte free ions, and participation in the electrochemical reaction. High voltage can achieve, is the large current and high voltage charging method, it can achieve, resonance is the pulse harmonic resonance method. From the solid state physics,no insulation at sufficiently high voltages can breakdown. Once the insulation breakdown, big lead sulfate will render a conductive State. If you impose high resistivity of insulated instantaneous high voltage or breakdown of lead sulphate crystals. If this high voltage short enough, and current limiting, penetrated the insulating layer of conditions, the charging current, would form the large amounts of gas. Battery on air strongly positive correlation to the charging current and charging time, if the pulse width enough, you can ensure that breakdown thick lead sulfate crystals, the simultaneous formation of micro-gas charge too late. In this way, has realized the pulse elimination of vulcanization. This shortcoming is the effect after repair is not ideal, repair time is very long.

3) Add fix for combined with pulse-repair
Fix agentAdd after the applied electric field, use it's own active material decomposition lead sulfate particles, the Crystal Crystal surface active substances (pb/pbo2) activation of regeneration, the sulfate ion electrolytes; on the back is not generated lead sulfate crystals, these micro-particles in the applied electric field, will even adsorbed on the electrode to lead sulfate crystals in electrode interface will never arise. And you can avoid the usual water loss of overcharge. Effectively improve the whole battery of active substances utilization, and enable battery electrode long in a new battery status. Fundamentally overcomes the battery because lead sulfate salinity caused by the shortcomings of the battery capacity drops, extending the life of lead acid batteries, it can make any one without physical damage of lead-acid battery is able to fundamentally resolve the life short, capacity fatal weakness of falling fast.
From the above comparison, the conclusion is that, regardless of the use of pure high-current repair or repair with pulse or cannot fundamentally suppression sulphate, which is fixed by effects and duration can not reach the desired result. Popular can say instruments repair belong to physiotherapy and rehabilitation agents belong to chemical treatment. Only by uniting in order to achieve better results. Like medicine.

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