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The PCM or PCB (Protection Circuit Module or Board) is the “heart” of the Li-ion battery pack. It will protect the Li-ion battery pack from over-charging, over-discharging and over-discharging, so it must avoid Li-ion battery pack explosion, fire and damage.
For low-voltage Li-ion battery packs (>20 cells), you should consider using an advanced BMS (Battery Management System) to monitor the performance of each cell to ensure safer battery operation.
A Battery Management System (BMS) is any electronic system that manages a rechargeable battery (cell or pack), for example by monitoring its status, calculating auxiliary data, reporting that data, protecting the battery, controlling its environment, and/or balancing it. The BMS can monitor the status of the battery, expressed in various items, such as
Voltage: total voltage, or voltage of individual cells
Temperature: average temperature, or temperature of individual cells
State of Charge (SOC) or Depth of Discharge (DOD): indicates the battery’s charge level
State of Health (SOH), a differently defined measurement of the overall condition of the battery
Current: Current flowing into or out of the battery
New feature: Li-Ion/Lithium Iron Phosphate Bluetooth technology available for battery protection circuit boards
AA Portable Power has its own facility to design and manufacture high quality PCMs and BMS for all types of Li-ion battery packs. we test each PCM before shipping and guarantee that the PCM is fully functional and safe.