Intrinsic safety mechanism and case analysis of energy storage systems based on dynamically reconfigurable battery network

doi:10.19799/j.cnki.2095-4239.2022.0282

Abstract

Abstract:

With the rapid advancement of electrochemical energy storage technology, intrinsic safety concerns about energy storage systems have emerged. Nonetheless, the "short board effect" of the battery system caused by the mismatch of inherent differences in battery cells and the traditional fixed series parallel grouping method is the primary reason for the current electrochemical energy storage system's safety and economic problems. Recently, digital energy storage systems based on dynamically reconfigurable battery network (DRBN) have received extensive attention. By deeply coupling low-power semiconductor devices to the batteries, DRBN transforms the battery from an electrochemical reaction device to a new type of digital device and eliminates the thermal accumulation and thermal runaway problems caused by overcharge and overdischarge in principle by reconfiguring the topology of the physical connection of the battery in milliseconds, achieving intrinsic safety at the battery system level. Furthermore, DRBN can quickly diagnose and remove faulty batteries and keep the electrochemical energy storage system running, which greatly improves the availability and reliability of the system. This paper explains the intrinsic safety mechanism of digital energy storage systems in the online diagnosis of sudden faults and rapid automatic isolation of suspected faults using an actual engineering case study, paving a new path for the safety and economy of electrochemical energy storage systems.

Key words: dynamically reconfigurable battery network, digital energy storage system, intrinsically safe, online fault detection, automatic fault isolation

CLC Number:

TM 912

Congjia ZHANG, Minda SHI, Chen XU, Zhenyu HUANG, Song CI. Intrinsic safety mechanism and case analysis of energy storage systems based on dynamically reconfigurable battery network[J]. Energy Storage Science and Technology, 2022, 11(8): 2442-2451.

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参数	数值
储能系统总额定功率/额定能量容量	10 MW/34 MWh
储能集装箱额定功率/额定能量容量	500 kW/1.72 MWh
DESS额定电压/额定容量	716 V/600 Ah
电池模组额定电压/额定容量	51.2 V/200 Ah
电池单体额定电压/额定容量	3.2 V/200 Ah
电池最大放电深度 (DOD)	0～100%
储能电池直流电压范围	560～817.6 Vdc
储能系统交流侧额定电压	400 Vac
运行温度范围	-30～45 ℃