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What is the Equalization Technology of Lithium-Ion Batteries?

Sep. 03, 2020

As a 18650 3.7 v Battery Factory, share with you. In order to solve the problem of battery consistency, the industry has widely used equalization technology. At present, the industry has divided the equalization technology into passive equilibrium method, active equilibrium method, and internal equilibrium method.

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1. Commonly used equalization methods are active equalization and passive equalization based on power circuits. In the passive equalization method, a single rechargeable battery with a high working voltage is charged and discharged according to the power circuit connected to an input resistor. According to more power circuits, it can be determined whether its working voltage is the same as the working voltage of other single rechargeable batteries. When the rechargeable battery is terminated, the disadvantage of the passive equalization method is the energy consumption, heat generation, and long equalization time of a single rechargeable battery.

The characteristic of the passive equalization method is: when the equalization current is less than small, the component cost is relatively low, but there are two problems: 1. The energy consumption of the resistance is charging and discharging, and the energy consumption is the current heat; 2. The charging and discharging resistance is unlikely The selection is small, the battery is charged and discharged, and the battery's operating voltage is usually higher according to the characteristics of the rechargeable battery. When static data is equalized, the discharge is just a small rechargeable battery.

2. The active equalization method transfers the kinetic energy of the rechargeable battery to the battery with a lower working voltage according to the consumption of the resistance when recharging the battery.

The key feature of the active equalization method is the DC//cd/cd dual digital power amplifier equalizing power supply circuit. In the whole process, it has high efficiency, battery charging and discharging and static data equalization, large equalizing current and fast balancing speed, but there are two problems: 1. The technology is complicated, the cost increases, and it is difficult to complete;

3. The internal equalization method is to use bms during the entire charging process, adjust and run the battery charging operating voltage optimization algorithm according to the current, so that the charging capacity of each single rechargeable battery in the lithium battery is basically the same. The internal equalization technology is simple, there is no kinetic energy damage, no extra battery charging process, no harm to the number of battery cycles, no hardware configuration machine equipment, but if the battery charging phase distance is large, it takes a long time to equalize.

The inconsistency of rechargeable batteries comes from the resistance, volume and transaction volume of the battery, and the traditional consistency evaluation method and equalization method as a safeguard measure cannot reasonably increase the energy capacity of the lithium battery, so it cannot improve the consistency of the lithium battery The negative impact of the problem on the application of combined rechargeable batteries.

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