The role of lithium battery protection board

Charge and discharge protection for series-connected lithium battery packs.

The main components of lithium battery protection board

The protection board usually includes control IC, MOS switch, resistor, capacitor and auxiliary device NTC, ID memory and so on. Among them, the control IC controls the MOS switch to turn on under all normal conditions, so that the cell communicates with the external circuit, and when the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off (tens of milliseconds). Protect the safety of batteries. NTC is the abbreviation of Negative temperaturecoefficient, which means negative temperature coefficient. When the ambient temperature rises, its resistance decreases. The electrical equipment or charging equipment is used to respond in time and control internal interruptions to stop charging and discharging. ID memory is often a single-wire interface memory. ID is the abbreviation of Identification, which means identification, and stores information such as battery type and production date. Can play a role in product traceability and application restrictions.

The working principle of lithium battery protection board

The protection function of lithium battery is usually completed by the protection circuit board and current devices such as PTC. The protection board is composed of electronic circuits, which can accurately monitor the voltage of the cell and the charging and discharging circuit at all times under the environment of -40℃ to +85℃. Current, timely control the on and off of the current loop; PTC prevents severe damage to the battery in high temperature environments.

Ordinary lithium battery protection boards usually include control ICs, MOS switches, resistors, capacitors and auxiliary devices FUSE, PTC, NTC, ID, memory, etc. Among them, the control IC controls the MOS switch to turn on under all normal conditions to make the cell and the external circuit conduct, and when the cell voltage or loop current exceeds the specified value, it immediately controls the MOS switch to turn off to protect the cell’s Safety.

When the protection board is normal, Vdd is high level, Vss and VM are low level, DO and CO are high level. When any parameter of Vdd, Vss, VM is changed, the level of DO or CO will be Changes.

Shenzhen Litongwei Electronic Technology Co., Ltd (LTW) established in 2005, A 16-year experienced professional BMS(lithium battery management system) designer & BMS 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 li-ion battery protection board BMS, polymer lithium-ion battery protection board 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 battery protection board, hardware battery protection board, we have a team of more than 30 design engineers, can customize the li-ion 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.