What is the equalization technology of lithium-ion batteries?

What is the equalization technology of lithium-ion batteries? Lithium battery packs are composed of multiple single lithium batteries combined in series and in parallel. Because lithium batteries will have individual differences, in order to solve the problem of battery charging consistency, the industry has widely used equalization technology, and the industry has now adopted equalization technology. Divided into passive equilibrium method, active equilibrium method, and internal equilibrium method. 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 resistance. 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 of a single rechargeable battery, heat generation, and a long equalization time. The characteristic of the passive equalization method is that when the equalization current is less than a certain value, the component cost is relatively low, but there are two problems: 1. The energy consumed by the resistance will generate heat, and the charging current will be consumed; 2. When the static data is equalized, only It is suitable for small batteries; 2) The active equalization method transfers the kinetic energy of the battery to the battery with a lower working voltage according to the consumption of resistance during charging. The key feature of the active equalization method is the digital power amplifier equalization power circuit, which efficiently charges and discharges the battery during the whole process and realizes static data equalization. The equalization current is large and the equalization rate is fast. However, the main problems are high cost and complex structure. At present, active balancing technology is basically used in the power management of such large-scale batteries in electric vehicles. 3) The internal equalization method uses bms during the entire charging process, adjusts and runs the battery charging operating voltage optimization algorithm according to the current, so that the charging capacity of each single charging unit to 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 the rechargeable battery comes from the resistance, volume and capacity of the battery, and the traditional consistency evaluation method and equalization method as a safeguard measure cannot reasonably increase the capacity and service life of the lithium battery, so it cannot improve the consistency of the lithium battery. The negative impact of sexual issues on the application of combined rechargeable batteries. Since DC internal resistance, working voltage and capacity are the main parameters of lithium batteries, the basis of the charging process will not change in one or more cycles. After scientific research, we use soc as the balance reference object, determine the relevance of the equalization target, and use the equalization time flexibly to reduce the size of the equalization circuit. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the advantages of magnesium batteries compared with lithium batteries?