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Modular Active Charge Balancing for Scalable Battery Packs

机译:可扩展电池组的模块化有源电荷平衡

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High-voltage battery packs consist of series-connected lithium-ion cells and require sophisticated battery management systems (BMSs) to maintain safe operating conditions. Active cell balancing is an important task of a BMS, performed in order to improve the usable capacity of the battery pack by equalizing the charge levels of individual cells. With the emerging trend of distributed BMS topologies, the associated balancing architectures are required to be modular, consisting of homogeneous units that minimize integration efforts. In this paper, we propose a modular active charge balancing architecture along with its control scheme for implementation toward such distributed BMSs. Compared with existing approaches, our proposed architecture provides increased charge transfer capabilities, with reduced hardware and control complexity. We propose a closed-form analytical model of the balancing architecture, which can be used to perform fast system-level simulation studies and design space exploration for analyzing efficient device combinations. A hardware implementation of the proposed balancing architecture is developed and measurements made with it are used to validate each part of our analytical model. Using the validated analytical model, we performed a case study, which shows that our proposed architecture provides a 14.5 % improvement in charge transfer efficiency compared with existing approaches.
机译:高压电池组由串联连接的锂离子电池组成,需要复杂的电池管理系统(BMS)来维持安全的工作条件。主动电池平衡是BMS的一项重要任务,其执行目的是通过均衡单个电池的电量来提高电池组的可用容量。随着分布式BMS拓扑的新兴趋势,要求相关的平衡体系结构是模块化的,由最小化集成工作的同类单元组成。在本文中,我们提出了一种模块化有源电荷平衡架构及其控制方案,以实现针对此类分布式BMS的实现。与现有方法相比,我们提出的体系结构提供了增强的电荷转移功能,同时降低了硬件和控制复杂性。我们提出了一种平衡架构的封闭形式的分析模型,该模型可用于执行快速的系统级仿真研究和设计空间探索,以分析有效的设备组合。开发了所提出的平衡架构的硬件实现,并使用其进行的测量来验证我们的分析模型的每个部分。使用经过验证的分析模型,我们进行了案例研究,结果表明,与现有方法相比,我们提出的体系结构将电荷转移效率提高了14.5%。

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