What Are The Lithium Battery Protection Boardand Battery Management System? What Does It Do?

The lithium battery protection board can protect the series parallel battery pack from charge and discharge, and can detect the over-voltage, over-current, over-temperature, under voltage and short circuit of each single battery in the battery pack, so as to prolong the service life of the battery and avoid damage to the battery due to over discharge. Lithium battery protection board is an indispensable part of lithium battery.

The lithium battery protection board also has the function of balanced protection, including energy consumption and energy conversion. Energy consumption equalization refers to the use of resistors to dissipate excess electrical energy from a battery with high power or voltage in a series of batteries. Energy consumption equalization is divided into charging time equalization, voltage fixed-point equalization and static automatic equalization.

Equalizing during charging: during charging, when the voltage of any battery is higher than all average voltages, the protection board will start equalizing protection.

Voltage fixed-point Equalization: the lithium battery protection board is set at a voltage point to start equalization, which is only carried out at the end of battery charging, and the equalization time is short.

Static automatic equalization: it is carried out during charging or discharging. Even if the battery is in static standby state, when the voltage is inconsistent, the lithium battery protection board will start equalization protection until the voltage is consistent.

Energy transfer type is to transfer large capacity batteries to small capacity batteries in the way of energy storage, so as to test the capacity of the battery for balance, which is divided into constant capacity balance and fixed capacity balance.

Battery management system

Battery management system (BMS for short) has the function of measuring battery voltage, and also includes battery protection function, battery balance function, battery reserve function, energy measurement function, network communication function, etc. The battery management system can prevent the battery from over discharging, over charging, over temperature and other abnormal conditions.

Because the lithium battery may damage the performance of the battery under the condition of serious overcharge and over discharge, and even cause the danger of explosion, the battery management system exists to monitor, protect and balance the lithium battery, so as to improve the working efficiency of the lithium battery.

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, and is an important component of lithium battery. The battery management system can be edited and comes with its own battery management software. It is relatively more intelligent. It is equivalent to the brain of lithium battery and plays the role of control.

2. lithium battery protection board plays an important role in 3C lithium battery and power battery field, and battery management system is applied in power battery field

3. the battery management system operates better than the battery protection board, but its performance is unstable at low temperature.