Definition and function of lithium battery protection board and battery management system
Battery protection board
The lithium battery protection board can play a role in the charge and discharge protection of the series and parallel battery packs, and can detect the overvoltage, overcurrent, overtemperature, undervoltage, and short circuit status of each single cell in the battery pack, prolonging the battery life and avoiding The battery is damaged by over-discharge. Lithium battery protection board is an indispensable part of lithium battery.
The lithium battery protection board also has a balanced protection function, and there are two ways of energy consumption and energy transfer. Energy-consumption equalization refers to the use of resistors to consume a certain battery with high power or voltage among multiple strings of batteries. Energy-consuming balance is divided into equalization during charging, voltage fixed-point equalization, and static automatic equalization.
Balance while charging: When charging, when the voltage of any battery is higher than the average voltage, the protection board will start the balance protection. Voltage fixed-point equalization: The lithium battery protection board is set to start the equalization at a voltage point, which is only performed at the end of the battery charging, and the equalization time is short.
Static automatic balance: During charging or discharging, even if the battery is in a static state, when the voltage is inconsistent, the lithium battery protection board will start the balance protection until the voltage remains consistent.
The energy transfer type is to transfer a large-capacity battery to a small-capacity battery by means of energy storage, and to check the capacity of the battery for balance, which is divided into capacity constant balance and capacity fixed-point balance.
Battery Management System
Battery Management System (Battery Management System) is abbreviated as BMS, which has the function of measuring battery voltage, and also includes battery protection function, battery equalization function, battery reserve function, energy calculation function, network communication function, etc. The battery management system can prevent the battery from over-discharge, over-charge, over-temperature and other abnormal conditions.
Since lithium batteries may damage battery performance and even cause explosion hazard under severe overcharge and overdischarge conditions, the existence of the battery management system is to monitor, protect, and manage lithium batteries in a balanced manner, thereby improving the working efficiency of lithium batteries.
Similarities and differences between lithium battery protection board and battery management system BMS
Both the lithium battery protection board and the battery management system protect the lithium battery. The difference between them is:
1. The lithium battery protection board is composed of IC, MOS tube, resistor and capacitor components, which is an important component of lithium battery. The battery management system can be edited and comes with battery management software, which is relatively smarter, equivalent to the brain of a lithium battery, and plays a role of control.
2. The lithium battery protection board plays an important role in the 3C lithium battery and power battery fields, and the battery management system is applied in the power battery field.
3. The battery management system operates better than the battery protection board, but its performance at low temperatures is unstable.