I am currently designing a battery-powered application, which involves a MCU and digital sensors. Two Li-ion batteries will provide voltage to the PCB and a step-down DC/DC converter creates the main +3.3V DC power supply. My question is the following:
What protection circuits should I have for the battery pack? I have the following in mind :
-> Overcurrent protection
-> Overvoltage protection
-> Excessiv temperature protection
Are all these necessary? What else should I consider?
Moreover, I intend to use a voltage monitoring IC to check when the battery voltage is really low and create and UVLO state of the system with the help of the MCU.
What about the battery monitoring? Is a simple ADC-measurements based monitoring of the battery voltage enough for determining how much battery capacity still remains? I know that this method is not very accurate, but I am wondering wether a full gas-gauge system is necessary.
Thanks,
Nikos