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It is an intelligent protection board scheme specially designed for 3 ~ 4 series battery packs of power tools, 12V starting power supply, medical batteries and other products. 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 20A.
● 3-4 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
● With UART communication
● RS485 communication with isolation
● Hardware discharge over-current, short-circuit protection function processing

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Discharge current	20A	30A		35A
Discharge overcurrent protection value	30A	40A		45A
Internal resistance of main circuit conduction	<10 mΩ
Charging current (same mouth)	10A	20A		25A
Charging current (sub-port)	None
Charging voltage	Number of three battery strings X 4.2V		Lithium iron phosphate battery pack string number X 3.6V

Overcharge protection	Equalization voltage
Detection voltage: Ternary 4.25±0.03V LiFe 3.75±0.03V	Detection voltage: Ternary 24.0 V LiFe 23.4V
Detection delay time: 1000 mS	Dissolution voltage: ternary < 4.0V lithium iron < 3.4V
Discharge voltage: Ternary 415±0.025V LiFePO4 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 2.5±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 2.7±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: 25011s	Discharge high temperature lifting temperature: 60℃
Release condition: disconnect load/charge activated

Self-consumption of electricity	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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