- Jan 10, 2018 -
What are the principles and advantages of pulse charging?
High voltage and large current moment is a major role for curing to pulse, the battery for curing and repairing effect of reduced capacity significantly, the main theory of job market battery repair machine on the way to the positive pulse vulcanization mechanism: the reaction of lead sulfate and lead sulfate the negative battery discharge, lead sulfate just generated by ion soluble and conductive problems such as not timely to charge reduction, lead sulfate molecules combine to form larger molecules will lead sulfate crystal insulation insoluble, the battery can not be formed sulfate - sulfide.
In solid physics, any insulating layer can be penetrated under high enough voltage. Once the insulating layer is broken, the lead sulphate will be conductive. The lead and sulfuric acid will be regenerated under the strong redox action of the current to participate in the electrochemical reaction. If the pulse width is short enough, the microcharge can not be formed at the same time when the crystallization of the heavy lead sulfate is worn. In this way, the pulse can be eliminated under the condition of lossless battery.
The best time to realize pulse vulcanization is the late charging period, that is, the three stage trickle holding section, and the high voltage pulse current is relatively less absorbed and diverted. Because the narrow pulse width and the diversion of other substances, the energy that is used to remove sulfidation is limited. The short time pulse de sulfurization repair effect is limited, and the long-term use of pulse repair charger will be better.
At present, many manufacturers have launched pulse type charger, the incomplete detection has small amplitude current pulse (<2a pulse width (seconds) time (a short pulse timing manufacturers in Guangdong about 60 seconds), and many claimed that the pulse charger tested could not find the pulse waveform, pure speculation and deceive consumers.
For positive and negative pulses, high frequency pulses (8.333khz frequency conversion pulse), or high cost, or technical reasons (effective and effective pulse charger to eliminate noise and interference when pulse is very difficult), it is still in the concept stage, and it is hard to find products in the market. Once the market is also because the price is high, the user is difficult to accept, push but not wide.
Because nickel cadmium battery is easy to polarize during regular charging, constant or constant current charging will cause the electrolyte to generate hydrogen and oxygen gas continuously, and its oxygen will penetrate into the negative electrode and cadmium plate to generate CdO when the internal pressure is high, resulting in the decrease of effective capacity of the plate. The charging and discharging method is usually used in pulse charging, that is to say, charge for 5 seconds and put it for 1 seconds. This charging process of oxygen in the discharge pulse will be reduced to most of the electrolyte, the gassing rate is greatly reduced, reducing the gas evolution can make the concentration polarization and ohmic polarization naturally are eliminated, thus reducing the battery internal pressure, the pulse of the next stage constant current charging more smoothly, so the lead-acid battery can absorb more power.
Intermittent pulse makes the lead-acid battery have sufficient chemical reaction time, thereby reducing the volume of gas in lead-acid battery during charging and improving the acceptability of lead-acid battery charging current.
The pulse charge method is charged for 5 seconds, and the charge is stopped for 1 seconds. This charging method will make produced in the process of charging the lead-acid battery hydrogen and oxygen to stop charging pulse in , most of the precipitation of oxygen and hydrogen was reduced into the electrolyte, which not only reduces the lead-acid battery in the charging process of electrochemical reaction - internal electrolysis of water generated by gas evolution, and to has been a serious polarization caused by the failure of the lead-acid battery and repair, in the use of the charging method for lead-acid battery charging and discharging failure of 5 - 10 times, will restore the capacity of lead-acid battery gradually