3.6. Life cycles (finished cycles) counting, and monitoring
Detail algorithm:
✓ If the discharge DOD reaches to the 80%DOD, it will be 1 cycle.
✓ If one-time discharge is not reach to the 80%DOD, it will be accumulated to
80%DOD, then it will count one cycle.
3.7. Total discharge capacity (or energy) measuring and monitoring
Measure and store the accumulated discharge capacity (Ah) or energy (Wh) in whole
battery life, error < 5%.
Ampere integral method is applied: the current and discharge time will be monitor by
BMS, then calculate the discharge capacity by ampere integral method.
3.8. Cell voltage balancing
Control and balance the voltage between cells together during charging
Detail algorithm: When the one cell reaches to the 3.5V, cell voltage deviation ≥
20mV, and when charging the battery, the balance function will start, then charging
current will be limitedto 60-100mA
3.9. Charge current limitation
Control and self-limit the battery charging current when charging current exceeds
allowed value
Detail algorithm: If the current is exceeded than allowed value, the MOSFET wil turn
off, then charge self-limit function will start, the current will be limited to about 10A.
3.10. Short-circuit protection
Short-circuit detection and protection
3.11. Polarity reverse protection
Polarity reverse detection and protection
3.12. RS232/RS485 communication
Communicate with computer or other devices.
✓ RS232: Used for BMS firmware update. It is adopting RS-232 series port to
upload data. Contents of data transmit include BMS parameters, battery running
status, alarms, etc. Generally, speed rate of RS-232 is 1200bps.
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