Dynamic reconfigurable battery energy storage technology： Principle and application

doi:10.19799/j.cnki.2095-4239.2023.0539

Abstract

Abstract:

The elimination of the "bucket effect" of battery systems in a fundamental manner is a challenging problem in the field of battery energy storage system (BESS). At present, this problem is being solved by pursuing the consistency of battery cells during their production and use; however, this method not only incurs a high cost but also is unable to fully eliminate the bucket effect. Therefore, we propose the dynamic reconfigurable-battery (DRB) energy storage technology based on energy digitalization. In comparison to the conventional norm of fixed series-parallel connections, the DRB networks use new program-controlled connections between battery cells/modules. By controlling the charging/discharging time of each battery unit connected to the circuitry, each battery cell/module could work in its "best effort" manner with no over-charge or over-discharge. Based on the DRB energy-storage technology, we propose the energy control and system-level intrinsically safe control methods. The energy control problem is formulated as an optimization issue, and the intrinsically safe control methods based on the controllable series and parallel technology are analyzed. The real-world operation data show that DRB networks can fundamentally improve safety, reliability, efficiency and cycle life of BESSs, paving a new path for building large-scale, long-life, and low-cost BESSs.

Key words: dynamic reconfigurable battery network, digital energy computation, battery energy storage system, safety, efficiency

CLC Number:

TM 912

Song CI, Congjia ZHANG, Baochang LIU, Yanglin ZHOU. Dynamic reconfigurable battery energy storage technology： Principle and application[J]. Energy Storage Science and Technology, 2023, 12(11): 3445-3455.

Figures/Tables 11

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指标	低压低功耗MOSFET	IGBT
电压	50～200 V	0.6～6.5 kV
电流	100～200 A	750～3600 A
开关频率	可达几百kHz	可达几十kHz
导通电阻	1～8 mΩ	<400 mΩ
成本	1～3美元	4～12美元

项目	额定电压/V	额定容量/Ah	额定功率/kW	额定电量/kWh	备注
单体电芯	3.2	206	0.3296	0.6592	磷酸铁锂单体
电池模组	51.2	206	5.2736	10.5472	电芯1并16串
动态可重构电池网络	716.8	618	125(受PCS最大功率限制)	442.9824	电池模组3并14串
数字储能电站	35 k(AC)	49440	10 k	34 k	数字储能子系统80组

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