Novel layered equalization circuit

Abstract

The invention discloses a novel layered equalization circuit. The novel layered equalization circuit is used for balancing a series power battery pack or a series energy storage device. The equalization circuit comprises 2-4 bottom-layer battery modules, wherein each battery module comprises 2-4 single batteries, so that layered and active balancing of 4-16 series batteries can be achieved. The equalization circuit comprises a bottom-layer equalization circuit and a top-layer equalization circuit, wherein the bottom-layer equalization circuit is used for balancing the interiors of the battery modules, and the top-layer equalization circuit is used for balancing among the battery modules. The bottom-layer equalization circuit and the top-layer equalization circuit both employ the same circuit topology based on inductor energy storage, the structure is simple and reliable, and many equalization paths are generated. By the equalization circuit, the unbalanced phenomenon of the series battery pack can be rapidly improved, and the equalization circuit is suitably used for a battery management system of an energy storage device in an electric vehicle or an energy storage power station.

Description

technical field [0001] The invention relates to the technical field of equalization of series battery packs, in particular to a novel layered equalization circuit. Background technique [0002] In recent years, with the deteriorating air quality and the scarcity of oil resources, new energy vehicles, especially pure electric vehicles, have become the development hotspots of major automobile companies in the world today. As a key component of electric vehicles, the power battery pack has a major impact on the power, economy and safety of the vehicle. After multiple charging and discharging cycles of the power battery pack, the distribution of the remaining capacity of each single battery will generally appear to be uneven. If it is not balanced, overcharging and overdischarging will easily occur. In this way, in actual use, the service life of the battery pack will be seriously affected, and there may even be a safety hazard of overheating and fire. [0003] In view of the ...

AI Technical Summary

Problems solved by technology

According to the energy consumption of the circuit in the equalization process, the current balance control method of lithium-ion battery packs can be divided into two categories: energy dissipation type and energy non-dissipation type; Connect shunt resistors in parallel, and control the corresponding switching devices to consume the energy of the battery module with high remaining capacity through the resistors. This method wastes energy in vain, and generates a lot of heat during the equalization process, which increases the thermal management of the battery. load

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