Lead-acid batteries have a history of more than 100 years, the beginning of the world’s common along the point of aging and operating procedures: charge, discharge rate of 0.1 c is the battery capacity) longer life.
In order to solve the problem of rapid charging, American Mr. Max published his research results to the world in 1967, charging with pulse current at a rate greater than 1c, and discharging the battery during intermittent charging. Discharge is helpful to eliminate polarization, reduce electrolyte temperature and improve the ability of electrode plate to accept charge.
In 1969, a number of Chinese scientists and technicians successfully manufactured various brands of fast chargers according to Mr. Max’s three laws. In 2000, this principle was applied to the electric car charger. During the charging process, the charging path was not cut off, and the battery of best crank drive electric bike was short-circuited with small resistance to discharge.
When short circuit, because do not cut off the charging path, in the charging channel connected inductors. Generally, the short circuit within 1 seconds is 3-5 milliseconds (1 seconds / 1000 milliseconds). Because the current in the inductor can’t jump and the short circuit time is short, it can protect the power conversion part of the charger.
If the charge current direction is positive, the discharge is naturally negative, the electric vehicle industry has a term “negative pulse charger”, and it can prolong the battery life and so on.