Due to the safety of lithium batteries, an external protection board must be used for the monitoring of each battery, the use of batteries in parallel is generally not recommended, if parallel must ensure the consistency of the parameters of the battery (capacity, internal resistance, etc.), in addition to the series connection of the battery must also be consistent parameters, otherwise the performance of the battery pack will be much worse than the performance of a single cell.
Lithium battery pairing standards Voltage difference ≤ 10mV, internal resistance difference ≤ 5mΩ, capacity difference ≤ 20mA
The purpose of lithium battery pairing is to ensure that the capacity, voltage, internal resistance, and effect of each battery in the battery pack is consistent, inconsistency will lead to the use of lithium battery pack in the process of various parameters farther and farther away, resulting in voltage imbalance, over time will be overcharged, over-discharged, capacity does not play, causing the risk of explosion and fire.
