Abstract
Battery packs are widely used in electric vehicles, and their state-of-charge is one of the essential issues that affect the performances, whilst the balance between parallel and series cell of the battery pack always has an obvious effect. To enhance the working performance of the lithium-based power battery pack, a hybrid natural and forced active balancing control (HNFABC) strategy is proposed and adopted to the balancing circuit that is proposed in this work. These converters, which are advantageous in natural balancing and forced equalization, accelerate the balance speed of natural equilibrium in the final stage and protect the battery from being repeatedly charged and discharged. Simulation and experimental results show that HNFABC is not only simpler than other traditional balance control strategies but also faster in the equalization process. The idea of combining natural equilibrium and forced equilibrium can be inspired to be used in some related industries.
Highlights
With the gradual deterioration of the global natural environment, new energy electric vehicles have attracted wide attention and are gradually applied around the world due to their environmental friendliness and can be used as controllable loads in close cooperation with power grids and charging stations [1,2,3]
In [9], Lee et al proposed a modular equilibrium idea, in which the system consists of N batteries and M equalization modules. e circuit structure is complex, and it is necessary to adjust the state of twelve switching tubes to achieve the primary energy balance
Working loss is paper proposed the concept of hybrid natural and forced active balancing control (HNFABC) strategy for a fast-balancing battery cells system based on the partnership of a new generation of vehicles (PNGV) model. e experimental results have demonstrated that the complementary equalization circuit topology with the HNFABC strategy achieves battery balancing, prolongs the life of the battery pack, and reduces the energy loss in the balancing progress. e main advantage of this structure is that, in order to transfer the energy that belongs to one battery to all others, only two switches are needed to control
Summary
With the gradual deterioration of the global natural environment, new energy electric vehicles have attracted wide attention and are gradually applied around the world due to their environmental friendliness and can be used as controllable loads in close cooperation with power grids and charging stations [1,2,3]. E scheme in the work presents a simple circuit structure, and shows a faster response compared with traditional methods, while a four-cell balancing experiment is provided This technology is difficult to be applied when the number of battery cells increases. A new balancing strategy called hybrid natural and forced active balancing control (HNFABC) is put forward, the operating principle of which is mainly based on the energy transmission of unbalanced current flowing from overcharged batteries to overdischarged batteries. In this case, energy naturally flows to a low-energy battery without any measurement sensor equipment.
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