The cell is the active device(battery protection board
. What we need to improve is the performance and technology of the cell, mainly the consistency. Besides, balancing on the protection board, whether in theory or in practical application, has disadvantages and advantages, but in theory, balancing plays a certain role, but it is obvious how useful it is. Why? Because the charging current is generally 2 ~ 10a, and we can only achieve 200mA at most. There are too many differences. At the same time, some equalization schemes start at the end of the charging voltage, which is more useless. And it has the disadvantage of too much.
port of the battery protection board
VDD is the positive pole of IC power supply, VSS is the negative pole of power supply, V - is the overcurrent / short circuit detection end, dout is the discharge protection execution end, cout is the charging protection execution end. 2. Port description of protection board: B + and B - are the positive pole and negative pole of the connecting core respectively; P + and P - are the positive and negative outputs of the protection board respectively; T is the temperature resistance (NTC) port, which generally needs to cooperate with the MCU of the appliance to generate protection action. As will be introduced later, this port is sometimes marked with ID, which means the identification port. At this time, R3 is generally the resistance with fixed resistance value, so that the CPU of the appliance can identify whether it is the specified battery.
1.(battery protection board)
The output negative pole, charging negative pole and battery negative pole must be connected in sequence. Do not reverse the line to avoid burning the circuit components
2. Charging line, discharge line, battery negative pole. Try to use thick wire, otherwise it will not be able to pass large current, which will play an overcurrent protection and cause the circuit to not work
3. The positive output of the battery is directly connected to the output without passing through the protection circuit