BMS for Lithium ion battery

Selecting BMS is not only dependent on the battery amps or Ah. It also depends on several other parameters like maximum charging current, maximum discharging current of the battery, peak current i.e. by what rate we can charge or discharge our battery like 0.5C or 0.8C or 1C. This capacity C rating is provided by the battery provider.

As specified above 4S, it can be made up of LFP as well as NMC cells.

LFP chemistry offers a longer cycle life. Nominal cell voltage is 3.2V

Nominal cell voltage: 3.2 V

Maximum charge voltage: 3.65 V

So with LFP maximum charge voltage is 3.65V cell we need 4* 3.65 which comes to 14.6volt . That means 14.6volt is max input voltage in charging.

NMC chemistry offers a high current capability. Nominal cell voltage is 3.7V

Nominal cell voltage: 3.7 V

Maximum charge voltage: 4.2 V

And if NMC maximum charge voltage 4.2V is used 4*4.2 which comes to 16.8volt. That means 16.8volt is max input voltage in charging.

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