In-situ monitoring method and device with temperature compensation for state-of-charge (SOC) of vanadium cell electrolyte

• Main Authors: TANG HONGLI, ZHANG JIE, SUN XIAOSHENG, LIU JUN, XU HUI, PENG LI, YIN XINGRONG, XIANG XIAOJUAN, WU XUEWEN, WU XIONGWEI, HU YONGQING
• Format: Patent
• Language: Chinese; English
• Published: 15.06.2018
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRICITY; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY

The invention provides an in-situ monitoring method and device with temperature compensation for state-of-charge (SOC) of a vanadium cell electrolyte. The method comprises the steps of measuring oxidization-reduction potential (ORP) values of a positive/negative electrolyte in a series of SOC states under a plurality of temperatures; building a relation curve Y (Y=aX+b) between the ORP value of the electrolyte under a temperature t and In[SOC/(1-SOC)] or In[(1-SOC)/SOC], fitting to obtain a linear equation of values a and b with regard to the temperature t, and solving an X value by substituting the ORP vale measured under a temperature t1 into the formula Y=a1X+b1; and substituting X into SOC-X database, and obtaining an SOC value of the electrolyte. By the method, real-time temperature correction is performed on the relation between the ORP and In[SOC/(1-SOC)] or In[(1-SOC)/SOC], an SOC test error caused by temperature change is substantially reduced. 本发明提供了种带有温度补偿的钒电池电解液荷电态原位监测方法和装置，方法为：在多个温度下，测得系列SOC状态下的正