How to choose a lithium battery protection board?

Lithium-ion battery protection boards are divided into software protection boards and hardware protection boards. The hardware protection boards have low cost and are widely used, but their functions are limited. Take the hardware protection board as an example to share relevant knowledge. The purpose of the protection board is to protect the battery from overcharging and over-discharging, to guard against high current damage to the battery, and to balance the battery voltage when fully charged (the balancing ability is generally small. If there are batteries with poor consistency, the protection board is difficult to balance. There are also individual conditions that can be balanced.) Note: The protective plate shell is generally made of metal to facilitate heat dissipation; when installing the protective plate, it is necessary to insulate and heat the battery. According to the different charging and discharging ports; (1) Same port protection board: the same connection port is used for charging and discharging. From the outside, there are two external wires. Advantages: Convenient connection, charging port and discharging port will not be wrongly connected, and the price is cheaper. Disadvantages: charging and discharging use the same MOS tube to heat up quickly. (2) Port protection board: Different connection ports are used for charging and discharging. From the outside, there are at least three external wires. Advantages: Different connection ports are used for charging and discharging, the MOS tube has a long service life and the temperature will not be too high. Disadvantages: The cost is high, and the charging and discharging ports are easily connected incorrectly. The consequence is that there is no protection for the battery pack. According to the type of battery material: (1) Ternary lithium lithium ion battery protection board; nominal voltage 3.7V (2) Lithium iron phosphate lithium ion battery protection board: nominal voltage 3.2V (3) Lithium titanate lithium ion battery protection board : Nominal voltage 2.4V to distinguish the materials, don’t use the protection board indiscriminately. The parameters that need to be referred to are `.1. Number of strings (number of battery strings) 2. Separate ports on the same port (depending on your own battery conditions) Remember: the protection board of the same port It can be used as a split port, and the split port must not be used as the same port. 3. Charge termination voltage (number of strings * cell charge termination voltage) 4. Discharge termination voltage (number of strings * cell discharge termination voltage) 5. Discharge current (the limit current of the protection board during discharge, the larger the current, the more expensive ) 6. Charging current (the limit current of the protection board during charging, the charging time is 5-8 hours, which should be greater than the charger current, otherwise it will be over-protected) 7. Equalization function (marked with or without, most of them are passive equalization, Active equilibrium price is too expensive) 8. Communication function (individually available) 9. Heating board control function (in northern areas must consult the seller, especially in cold weather areas) 10. Protection board self-consumption (20-100 microamps) pay attention to the conversion : Ampere (A), milliampere (mA), microampere (μA) 11. Water resistance (not very useful, the battery price is much higher than the protection board) 12. Size (length * width * height) statement: this site Some pictures and content of the published article are from the Internet. If there is any infringement, please contact to delete the previous article: Is the lithium-ion battery protection board the same as the battery management system?