Comparison Analysis Be Tween Battery Protection Board and Battery Management System BMS

Do you know the difference between the battery protection board and the battery management system BMS? With the development of global diversification, our lives are constantly changing, including the various electronic products we come into contact with, so you must not understand these products Some components, such as battery protection board and battery management system BMS.

The English abbreviation of the battery management system is BMS, and the full English name is Battery Management System. The function of the battery management system is to protect the safe use of the battery pack. During the process of charging and discharging the battery pack, the service life of the battery pack can be extended while ensuring safety. The use of rechargeable batteries has increased dramatically in many electronic devices that require battery power. To ensure the battery is charged properly and optimize its lifespan, battery management or fuel gauge systems go up in parallel. The BMS battery management system is now complete. The lithium-ion battery protection board also has a balanced protection purpose, and there are two ways of energy consumption and energy transfer. Power leveling refers to the use of resistors to drain a single cell with high power or high voltage in multiple strings. Energy consumption balance is divided into balance during charging, fixed-point voltage balance and static automatic balance. The reason why a Li-ion battery (rechargeable) is to be protected depends on its own characteristics. Since the material of the lithium-ion battery itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited and ultra-high temperature charged and discharged, the lithium-ion battery components of the lithium-ion battery will always have delicate protection plates and current fuses.

Battery Management System (BMS) for short, has the function of measuring battery voltage, and also includes battery protection function, battery balancing function, battery reserve function, energy measurement function, network communication function, etc. The battery management system can prevent abnormal conditions such as over-discharge, over-charge, and over-temperature of the battery.

The protection function of lithium-ion batteries 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 and charge-discharge circuit of the battery cells at all times in the environment of -40°C to +85°C. The current can be controlled in time, and the on-off of the current loop can be controlled in time; the pTC can prevent the battery from being badly damaged in a high temperature environment.

Lithium-ion battery protection board is composed of IC, MOS tube, resistor and capacitor, which is an important part of lithium-ion battery. The battery management system can be edited and has its own battery management software, which is relatively smarter and controlled by the brain equivalent of a lithium-ion battery. One of the key functions of a BMS battery management system is to manage the battery system to ensure that it does not overcharge, or that its charge does not drop to the point where a running device must be shut down because the power runs out without warning. The battery management system should supply warnings so that the device can be shut down in an orderly manner. The environmental management portion of the battery management system will determine when to charge the battery and how much power it receives. Because the lifespan of batteries such as Li-Ion and other batteries depends heavily on the number of charge/discharge cycles, many battery management systems only charge the battery when needed.Regarding the lithium-ion battery protection board, when the battery is discharged to an external load, its voltage will gradually decrease with the discharge process. When the battery voltage drops to 2.5V, it is completely drained. At this point, if the battery continues to discharge, the load will cause permanent damage to the battery. During battery discharge, when the control IC detects that the battery voltage is lower than 2.3V (this value is determined by the control IC, different ICs have different values), its "DO" pin will change from high voltage to zero voltage, making From on to off, T2 cuts off the discharge circuit, so that the battery no longer discharges the load, which is used for over-discharge protection. At this time, due to the existence of the body diode VD2 of T2, the charger can charge the battery through this diode.

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