Abstract
Even with the same voltage level, different types of battery packs have different requirements for the volume of the battery equalization circuit. However, most equalization circuits have the same problem: the volume of the equalization circuit is fixed once the voltage level of the battery pack is determined. In order to solve this problem, this paper proposes a novel lithium battery equalization circuit with any number of inductors (ECANI). It can select any number of inductors less than half the number of batteries, even when the voltage level of the battery pack is determined. Simulation and experiments are used to verify the performance of the equalization circuit. The current error and the average final voltage error in the experiment are 1.69% and 0.33% lower than those in the simulation, respectively. So the circuit can achieve equalization with good accuracy.
Highlights
With the advantages of a high energy ratio, long life, high voltage and high energy density, Lithium-ion batteries are widely used in various fields [1], such as energy storage power stations, electric vehicles (EVs), hybrid electric vehicles (HEVs), electric bicycles, electric car balance, and so on
If the state of charge (SOC) of the batteries is less than 80%, these batteries will not meet the requirements of the corresponding power and voltage level, and the batteries need to retire according to the relevant national regulations
Non-dissipative equalization circuits can be divided into three types according to the number of energy storage components: the first type is shown in Figure 1; they only have one energy storage component, so they can only have two cells working at the same time, and the equalization current is small, which leads to the slow equalization speed [5,6]
Summary
Chusheng Lu 1,2 , Longyun Kang 1,2, *, Xuan Luo 1,2 , Jinqing Linghu 1,2 and Hongye Lin 1,2. Guangdong Key Laboratory of Clean Energy Technology, School of Electric Power, South China University of Technology, Guangzhou 510640, China. Received: 4 November 2019; Accepted: 11 December 2019; Published: 13 December 2019
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