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Function description of lithium battery protection module

2021-08-26 08:55:35 0

Function description of lithium battery protection module


1. Connect the lithium battery to the protection board according to the wiring diagram

The protection circuit separately detects the voltage and current of each battery in the series battery pack, and controls the charging and discharging process of the battery pack. The voltage of each battery in the battery pack is between the overcharge detection voltage and the overdischarge detection voltage, and

When there is no short circuit in the output, the MOS tube is turned on, and P+ and P- can be used to discharge the battery pack;


2. Battery pack over-discharge protection function

When the voltage of any battery in the series battery pack drops to the over-discharge detection voltage and reaches the over-discharge delay time, the over-discharge protection function is activated, cuts off the discharge MOS tube, prohibits the battery pack from outputting current, and protects the battery pack’s safety. The board enters the dormant state, the current consumption of the circuit board is below the dormant current, and the circuit that enters the dormant state can only be restored after the charger is connected and the battery voltage exceeds the over-discharge recovery voltage;


3. Battery pack overcharge protection function

In the process of charging the battery pack through P+ and C-, when the voltage of any battery rises to the battery overcharge detection voltage and exceeds the overcharge delay time, the overcharge protection function is activated, the charging MOS tube is cut off, and the battery pack is prohibited Charging to protect the safety of the battery pack. When the battery pack is connected to the load and discharged or the battery voltage drops below the overcharge recovery voltage, the overcharge state is restored;


4. Battery pack short circuit protection function

When the battery pack discharge port P+ and P- are short-circuited, the protection circuit will cut off the discharge MOS tube after the short-circuit protection delay time to prohibit the battery pack from discharging externally. When the external short circuit is removed, the circuit will automatically recover.


5. Battery Group overcurrent protection function

When the battery pack discharge port P+ and P- have an overcurrent phenomenon, the protection circuit will cut off the discharge MOS tube after the overcurrent protection delay time, prohibiting the battery pack from discharging externally. When the external short circuit is removed, the circuit will automatically recover.


6. Battery pack charge balance function

When the battery voltage of each battery in the battery pack is different due to the matching of the battery or the influence of the external environment, if the battery voltage difference between the series connected groups exceeds the set value, the equalization circuit is allowed to work, and the equalization starts during the charging process, and the equalization resistance Discharge the battery pack with the highest relative capacity, and the equalization current is the equalization absorption current value to reduce the voltage rise speed of the battery pack. When the voltage difference between the series batteries is less than the set value, the equalization circuit is prohibited from working without any equalization.


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About us

Shenzhen Litongwei Electronic Technology Co., Ltd (LTW) established in 2005, A 16-year experienced professional BMS(Lithium Battery Management System) designer & manufacturer in Shenzhen China. More than 8000Sqm Dust-free Workshop, 500+ employees and an excellent R&D Team. We are certified as a National High-Tech enterprise and got ISO9001 and ISO14001 approved. 


LTW’s main products are power battery pack protection circuit board BMS and digital battery protection module PCM. We have a product group covering almost the entire field, from lithium ion battery BMS, polymer lithium ion battery BMS, lithium iron phosphate lifepo4 battery BMS, from 1S 2S digital product battery PCM, to 3S-24S (3S 4S 5S 6S 7S 8S 9S 10S 11S 12S 13S 14S 15S 16S 17S 18S 19S 20S 21S 22S 23S 24S) power battery pack management system BMS, we have a complete process of customization, design, testing, mass production. Software batteries protection board, hardware batteries protection board, we have a team of more than 30 design engineers, can customize the lithium battery software protection pcb board with communication interfaces such as CANBUS RS485 SMBUS UART I2C. Our products are widely used in mobile phones, cameras, laptops and other digital electronic products,  power tool battery pack protection circuit pcb boards, electric bicycles, electric scooters, electric motorcycle battery management system BMS, electric vehicle EV battery BMS, etc.


Strong technical strength is the guarantee for the survival of LTW, and advanced production equipment guarantees product quality, with a monthly production capacity of up to 100,000 PCs. LTW BMS enjoys a high reputation in China and abroad for its fine production management and strict quality control management system. "Excellent quality, professional service" is our consistent aim and pursuit. Welcome to Litongwei factory inspection, and is willing to cooperate with you for a long time.


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