How to choose the protection board(BMS)?
How to choose the protection plate (BMS)
1、 clear your battery type (ternary, lithium iron, titanium lithium) to determine the battery pack is a few series (link) a few parallel (link), according to the number of strings to choose.
2、 determine the battery pack charging is the same port or sub-port, the same port is charging and discharging the same line, sub-port is charging line and discharge line independent.
3、 to determine the value of the current required to protect the board: I = P / U, that is, the current = power / voltage, remember, this is only a theoretical value. In reality, we take this theoretical value for reference, taking into account the load and uphill and just start the environment, generally two-wheeled electric vehicles to choose this theoretical value of more than 2 times, three-wheeled electric vehicles to choose this theoretical value of more than 3 times, four-wheeled low-speed vehicles generally have a 3.5 times or so. For inverter and energy storage, 1.2 times is almost the same. Or refer to the electric car controller current limit, the current value of the protection plate must be greater than the controller current limit value.
4、Equalization is to make the battery pack each string of the battery voltage difference is not large, through the equalization resistor discharge, so that the string battery voltage tends to the same.
5、Temperature control protection, the battery pack is protected by testing the temperature of the battery