The voltage of three lithium batteries connected in series is already 11.1V, but the charger output is only 5.2V! So I can't recharge it.
Three lithium batteries should be connected in parallel, so that the voltage of the three batteries is basically maintained at 3.7 V. The voltage of the charger which produces a voltage of 5.2 V is greater than that of 3.7 V of the battery. , so that the electricity can be charged. The time will be relatively longer, because the capacity of the three batteries combined is about three times the capacity of the original battery!
Series and parallel connection are two methods of combining lithium batteries.
The series connection method means that the negative electrode of the first lithium battery is connected to the positive electrode of the second lithium battery, and the negative electrode of the second lithium battery is connected to the electricitypositive trode of the third battery, and so on, until the required voltage is reached. The voltage of this connection method is the sum of the voltages of the cells connected together, and the capacity is the capacity of a single cell, which is then connected to the output. for protection. For example, a 12 V battery requires three strings (taking ternary materials as an example) and a 24 V battery requires seven strings.
The parallel connection method means that the positive electrode of the first lithium battery is connected to the positive electrode of the second cell, the negative electrode is connected to the negative electrode, and so on, until the required capacity is reached. is reached. The voltage in this overall method remains unchanged is the voltage of a single cell, and the capacity is the sum of all battery capacities.
The lithium battery combination requiresthese two methods of combination to obtain the required voltage and capacitance. Batteries are usually connected via nickel foils. This requires special equipment to solder the nickel sheets to the battery core. The method is relatively solid and safe. Then connect the corresponding protection before going out.