Balance function of lithium battery protection-Lithium - Ion Battery Equipment

Balance function of lithium battery protection board -Lithium - Ion Battery Equipment

Passive equalization and active equalization of lithium battery protection board

Hefei lithium-ion battery protection panel commonly used equalizing charging technologies include constant shunt resistance equalizing charging, switch parallel resistance equalizing charging, average battery voltage equalizing charging, switched capacitor equalizing charging, buck converter equalizing charging, inductor equalizing charging, etc. When lithium-ion batteries are charged in series, each battery should be charged evenly, otherwise the performance and life of the entire battery will be affected during use. However, the existing single-chip lithium-ion battery protection chip has no equalizing charge control function, and the equalizing charge control function of the multi-chip lithium-ion battery protection chip requires an external CPU. Through serial communication with the protection chip (such as I2C bus), the complexity and design difficulty of the protection circuit are added, the efficiency and reliability of the system are reduced, and the power consumption is added.(Lithium - Ion Battery Equipment)

According to the needs of the application, the equalization principle of the lithium-ion battery protection board can realize the protection and equalization of the power lithium-ion battery pack after changing the structure and voltage level of the protection chip mode, the serial number, the circuit of the power switching device and the energy consumption component.

As a battery with large energy reserve, lithium-ion batteries are widely used in computer rooms, communication base stations, data centers and other fields. The lithium-ion battery protection board has the function of protecting the battery and preventing overcharging.

Lithium-ion battery protection board passive balance and active balance:

The battery itself has usable capacity, but the battery system cannot continue to function as it should due to imbalances between the cells and limitations of the safe voltage settings that protect the cells. In addition, the battery life of the car is shorter than the life of the car itself, even if the car has not reached the end of its life, but to meet the dynamic performance and replace the battery. But the cost of replacing batteries is so high that EVs are largely constrained.

The main reason for the imbalance is temperature. Generally speaking, when the ambient temperature is 10°C higher than the optimum temperature, the life of the lithium-ion battery will be shortened by half. Due to the large number of series connection of the vehicle battery system, generally between 88-100 series, the capacity is generally between 20-60kWh, due to the different loading positions of each battery, there will be a temperature difference. Even within the same battery box, there will be temperature differences due to different heating locations and batteries, and this temperature difference will have a significant negative impact on battery life, making the batteries unbalanced, reducing battery cruising range and shortening cycle life. Due to these problems, the capacity of the entire battery system cannot be fully utilized, resulting in the loss of the battery system, and reducing the loss of the system will greatly prolong the life of the battery system.



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