The voltage-based equalization strategy is widely used in the industry because the voltage (U) of the battery cell is very easy to obtain, but it is difficult to provide an accurate parameter for the battery management system (BMS). This study proposes a new equalization strategy, which is based on the difference between the state of charge (SOC) of any two battery cells in the battery pack, that is, a ΔSOC-based equalization strategy. The new strategy is not only as simple as the voltage-based equalization strategy, but it can also provide an accurate parameter for the BMS. Simply put, using the relationship between the open circuit voltage and the SOC of the battery pack, the proposed strategy can convert the difference between the voltage of the battery cells into ΔSOC, which renders a good performance. Additionally, the required parameters are all from the BMS, and no additional calculation is required, which makes the strategy as simple as the voltage-based balancing strategy. The four experiments show that the relative errors of ΔSOC estimated by the ΔSOC-based equalization strategy are 0.37%, 0.39%, 0.1% and 0.17%, and thereby demonstrate that the ΔSOC-based equalization strategy proposed in this study shows promise in replacing the voltage-based equalization strategy within the industry to obtain better performance.

中文翻译：

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基于ΔSOC的均衡策略应用于工业

基于电压的均衡策略由于其电池单元的电压（U）非常容易获得，但是很难为电池管理系统（BMS）提供准确的参数，因此在业界得到了广泛的应用。本研究提出任何两个电池单元在电池组中的一个新的均衡策略，这是基于对充电状态（SOC）的状态之间的差，即，Δ SOC的基于均衡策略。新策略不仅与基于电压的均衡策略一样简单，而且还可以为BMS提供准确的参数。简而言之，利用开路电压和电池组SOC之间的关系，所提出的策略可以将电池单元电压之间的差转换为ΔSOC，因此表现良好。此外，所需的参数全部来自BMS，并且不需要任何额外的计算，这使得该策略与基于电压的平衡策略一样简单。四个实验表明，Δ的相对误差SOC推定由Δ SOC的基于均衡策略是0.37％，0.39％，0.1％和0.17％，从而证明了Δ SOC的基于本研究中提出的示出了均衡策略保证在业界取代基于电压的均衡策略以获得更好的性能。