The battery management system BMS is a system that manages the battery. It has the function of protecting the battery. By measuring the battery voltage, it prevents or avoids the occurrence of abnormalities such as battery over-discharge, over-charge, and over-temperature. Generally, the battery protection board system also has a battery pack balancing function, which can better exert the power of the battery pack, improve the use efficiency of the battery pack, and extend the service life of the battery pack.

The battery management system BMS usually applies to rechargeable lithium-ion battery packs.

Number of batteries in common applications of battery management systems

1S～30S (S: series connection)

Mobile phone: 1S

Tablet: 1~2S

Laptop: 2~3S

Electric hand tools: 3~5S

Large tools such as electric lawn mowers: 10S up

Electric passenger cars: In the early days, ternary lithium-ion batteries were generally used (nowadays, lithium iron phosphate or other materials with low impedance and higher safety are used), 80～100S

Electric bus: 100～200S up

Common features of BMS

Voltage measurement

communication

SOC remaining power estimation

SOH battery health estimation

Exception warning

Exception protection

Balance (passive balance or active balance)

Other control circuits (such as battery loop relay control)

Temperature measurement

Current measurement

diagnosis

With charger to provide corresponding charging strategy

Application of battery protection board PCM, battery management system BMS:

Mobile phones, MP3 players, voice recorders, notebook computers, electric bicycles, electric bicycles, electric scooters, electric two-wheeled vehicles, electric vehicles, elderly scooters, electric vehicles, pure electric vehicles, electric vehicles, electric boats, etc. A device, instrument, or vehicle that uses a battery and needs to be charged.