Investigate battery protection circuit
According to NR-SRD-139: Provide the protection circuitry schematic and a description of how it works.
- Cell Overcharge Procedures
- Overcharge cells/ batteries to 5.0V with a current of 1C.
- Record the voltage at which the protection activates and the MOSFET opens the circuit.
- Discharge the cells/ batteries at a rate of C/5 and record the voltage at which MOSFET closes the circuit.
- Complete a charge/ discharge cycle as specified in Section 4 and record the capacity.
- Cell Overdischarge Procedures
- Overdischarge the cells/ batteries at a rate of 1C to 0V.
- Record the voltage at which the MOSFET opens the circuit.
- Charge the pack at rate of C/5 and record the voltage at which the MOSFET resets itself.
- Complete a charge/ discharge cycle as specified in Section 4 and record the capacity.
- External Battery Short Procedures: Externally short the circuit pack using a 10 milliOhm load and hold it for three hours (recording the temperature of the battery every 5 minutes). Record the current at a rate greater than 1 kHz for the first three seconds of the test, and record the current at the time the MOSFET disconnects the circuit. After the External Short procedure, charge the cells/ batteries at C/5 current to determine the voltage at which the MOSFET resets itself. The pack should then go through one discharge/ charge cycle. Record the capacity.
Edited by Agis Zisimatos