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It is an intelligent protection board scheme specially designed for 20 series battery packs of power battery, electric bicycle, electric motorcycle, etc. It is suitable for lithium batteries with different chemical properties, such as lithium ion, lithium polymer, lithium iron phosphate, etc. The protection board has strong load carrying capacity and the maximum continuous discharge current can reach 60A.
● 20 cell series protection
● Various protection functions for charging and discharging
● Discharge over current, short circuit protection functional processes of hardware
● Over voltage, under voltage, temperature and overload protection function processing of software
● Accurate SOC calculation with automatic SOC learning function
● Reserved UART communication
● UART communication function, can read all data of battery in real time and upgrade online

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Discharge current	30A	40A		60A
Discharge overcurrent protection value	40A	50A		70A
Internal resistance of main circuit conduction	<10 mΩ
Charging current (same port)	20A	30A		40A
Charging current (sub-port)	None
Charging voltage	Ternary battery string number X 4.2V		LiFePO4 strings X 3.6V

Overcharge protection	Equalization voltage
Detection voltage: Ternary 4.25±0.03V LiFe 3.75±0.03V	Detection voltage: Ternary 4.0V LiFe 3.4V
Detection delay time: 1000 mS	Dissolution voltage: Ternary < 4.0V LiFe < 3.4V
Dissolution voltage: Ternary 415±0.025V LiFe 3.6±0.05V	Equalization current: 50-60 mA

Over-discharge voltage protection	Over-discharge current protection
Detection voltage: Ternary 2.7±0.1V LiFe 2.7±0.1V	Detection voltage: ternary 150mV lithium iron 150mV
Detection delay time: 1000 mS	Detection delay time: 5mS
Dissolution voltage: Ternary 2.9±0.1V LiFe 2.8±0.1V	Release condition: disconnect load/charge activated

Short circuit protection	Temperature control protection
Trigger condition: external load short circuit	Discharge over temperature protection: 75±±5℃
Detection delay time: 250 uS	Discharge high temperature lifting temperature: 60℃
Release condition: disconnect load/charge activated

Self-depletion	Operating temperature
Release condition: disconnect load/charge activated	Temperature range: -20℃ / +80℃
Operating power consumption: < 40 uA
Sleep-overdischarge power consumption: < 30 uA

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