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Batteries in series8/8/2023 ![]() ![]() Therefore, the efficiency of parallel charging of lithium batteries can be achieved on the basis of the current less than the sum of the currents of n parallel lithium batteries. The number of parallel batteries increases and decreases. According to the parallel internal resistance formula, the total internal resistance of the two parallel lithium batteries is equal to the ratio of the sum of the internal resistance products of the two batteries and the internal resistance. However, the internal resistance of the battery in parallel will also change. Under the formula of Ohm’s law: I=U/R, this design is reasonable. ![]() Therefore, the n-th parallel lithium battery that has been combined into a battery pack should achieve the same charging efficiency as the single-cell battery, and the charging current should be the sum of the n lithium battery currents. According to the parallel theory, the main circuit current is equal to the sum of the currents of the respective branches. The core content of parallel charging is the size of the parallel current and its effect. The characteristics of the parallel lithium battery are: the voltage is constant, the battery capacity is added, the internal resistance is reduced, and the power supply time is prolonged. Therefore, parallel charging of lithium batteries has different design characteristics compared with single-cell lithium batteries, mainly reflected in the consistency of charging current design and parallel battery. The purpose of parallel connection of lithium batteries is to increase the capacity.
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