Strings, Parallel Cells, and Parallel Strings
This not only can lead to a dangerous situation where one string gets over-charged while others become over-discharged, but it also exponentially reduces the usable capacity of the entire
Whenever possible, using a single string of lithium cells is usually the preferred configuration for a lithium ion battery pack as it is the lowest cost and simplest. However, sometimes it may be necessary to use multiple strings of cells. Here are a few reasons that parallel strings may be necessary:
Connecting multiple lithium batteries into a string of batteries allows us to build a battery bank with the potential to operate at an increased voltage, or with increased capacity and runtime, or both.
If there are only two batteries in the series string (Figure 1), we would then take a cable from the open POS. (+) terminal of the first battery and a cable from the open NEG. (-) of the second (last) battery in the string to the load and charger/power source.
If there are only two batteries in the parallel string, we would then take a cable from the POS. (+) terminal of Battery 1 to the charger. We would use the POS. (+) terminal of Battery 2 for connection to the loads.
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