18650 battery 3500mah

　　Balanced charging method for series UPS power battery packs

　　●A parallel equalization circuit is added to each single battery of the battery pack to achieve the purpose of shunting. In this mode, when a battery is fully charged first, the balancing device can prevent it from being overcharged, and at the same time convert excess energy into heat to continue charging the battery that is not yet fully charged.

　　●Before charging, pass through each cell one by one, discharge the same load to the same level, and then perform constant current charging, this time to ensure a more accurate balanced state between each cell. However, due to the physical differences between individual UPS power battery packs, it is difficult to achieve consistent results after deep discharge of each monomer. Even if the same effect is achieved after discharge, new imbalances will appear during the charging process.

　　●Test and evenly charge the individual batteries in the battery pack on time and in sequence. When the storage battery pack is charged, it can be guaranteed that each storage battery in the storage battery pack will not be overcharged or over-discharged, thus ensuring that each storage battery in the storage battery pack is in a normal working state.

　　●Using the time-sharing principle, through the control and switching of the switch components, the extra current flows into the battery with relatively low voltage to achieve the purpose of balanced charging. This method is more efficient, but the control is more complicated.

　　●Take the voltage parameters of each battery as the equalization object to make the voltage of each battery consistent. During balanced charging, the capacitor is alternately connected to two adjacent batteries through the control switch, receives the charge from the high-voltage battery, and then discharges to the low-voltage battery until the voltage of the two batteries tends to be the same. This equalization method better solves the problem of battery pack voltage imbalance, but this method is mainly used in occasions with a small number of batteries.

　　●The entire system is controlled by a single-chip microcomputer, and each single battery has an independent set of modules. According to the set program, the module manages the charging of each single battery separately, and automatically disconnects after charging is completed. This method is relatively simple, but when the number of single cells is large, the cost will be greatly increased, and it is also not conducive to the reduction of the system volume.