Is pulse charging harmful to the battery?

Pulse charging has no harm to the battery.

Pulse charging method charges for 5 seconds, stops charging 1 second, and so on. This charging method will reduce most of the oxygen and hydrogen produced in the charging process of lead-acid batteries to electrolyte under the pulse of stopping charging.

This not only reduces the gas precipitation caused by the internal electrochemical side reaction during the charging process of lead-acid batteries, but also has a repairing effect on lead-acid batteries that have been seriously polarized and caused failure. After the failed lead-acid battery is charged and discharged for 5- 10 times, the capacity of the lead-acid battery will gradually recover.

Extended data

According to incomplete statistics, pulse charging is divided into negative pulse, positive pulse and positive and negative pulse.

Negative pulse is to discharge the battery pulse intermittently when charging. Theoretically, the polarization voltage generated in the battery during charging will hinder the self-charging, especially in the late stage of fast charging, which will significantly increase the deflation rate and temperature rise. The magnitude of polarization voltage changes with the change of charging current.

When charging is stopped, the resistance polarization disappears, and the concentration polarization and electrochemical polarization gradually weaken. However, if the battery is provided with a discharge channel for reverse discharge, the electrochemical polarization will disappear quickly and the temperature in the battery will be reduced due to discharge.

Therefore, in the process of battery charging, the charging can be stopped at the right time and the discharge pulse can be increased appropriately, so as to quickly and effectively eliminate various polarization voltages and improve the charging speed.

positive pulse

The main function of high voltage and high current instantaneous positive pulse is desulfurization, which can obviously repair the capacity decline of battery caused by vulcanization. At present, the main working mode of battery repair machine in the market is theoretically positive pulse desulfurization mechanism:

When the battery is discharged, the lead in its negative electrode reacts with sulfuric acid to generate lead sulfate, and the newly generated lead sulfate exists in a soluble and conductive ionic state. If it is not charged and reduced in time, the lead sulfate molecules will combine with each other to form insoluble and insulating macromolecular lead sulfate crystals, which will make the sulfation-vulcanization of the battery impossible.

As far as solid state physics is concerned, any insulating layer can be broken down at a sufficiently high voltage. Once the insulation layer is broken down, crude lead sulfate will be in a conductive state, and lead and sulfuric acid will regenerate and participate in electrochemical reaction under the strong redox effect of current.

If the pulse width is short enough, gas evolution cannot be formed by micro-charging at the same time under the condition of ensuring the breakdown of crude lead sulfate crystal. In this way, pulse elimination vulcanization can be realized without damaging the battery.

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