Flow battery positive electrode protection system, flow battery system and control method

Abstract

The invention relates to a positive electrode protection system of a liquid flow battery, a liquid flow battery system and a control method, belonging to the field of liquid flow batteries, and aims to solve the problem of early detection of damage to the positive electrode of a liquid flow battery and reduce the monitoring and maintenance costs. The problem of cost specifically includes the addition unit, gas detection control system and control device, the added unit in the positive electrolyte storage tank adds additives, and the concentration of the chlorine gas precipitated due to the addition of additives to the positive electrolyte is determined by the gas Detected by the detection control system, and when the detected concentration exceeds the limit, the control device disconnects the protection of the battery system, which can greatly increase the life of the entire system and reduce the number of system maintenance, so it can greatly reduce operation and maintenance costs. .

Description

technical field [0001] The invention belongs to the field of liquid flow batteries, and relates to a positive electrode protection system of a liquid flow battery, a liquid flow battery system and a control method. Background technique [0002] All-vanadium redox flow battery has become the first choice for large-scale energy storage due to its advantages of high safety, long life, independent power capacity and convenient scale. The all-vanadium redox flow battery system includes three main units, namely power unit, electrolyte storage and supply unit, power electronics and control unit, in which the power unit mainly refers to the stack, and the electrolyte storage and supply unit includes electrolyte, positive and negative storage tanks , pipelines and heat exchange systems, power electronics and control units mainly include battery management systems, instruments and meters for collecting signals, and energy storage inverters. Due to the long-term operation of the all-v...

AI Technical Summary

Problems solved by technology

[0003] The existing method of monitoring electrode damage is: in each single battery of the battery system, install a patrol line for testing the single voltage of each single battery. Although this method is more direct, it cannot , the inspection line is often easily damaged, thus losing its function of testing the single voltage of the battery, and due to the large number of single cells in the battery system, it is almost difficult to monitor the single voltage by testing the voltage of each single battery, so by testing the voltage of the battery system Changing conditions require the configuration of professional instruments and operators, increasing maintenance costs

[0004] Or when the system is running abnormally, the problem is found by checking the battery system, but at this time the battery electrodes are likely to be damaged, causing certain economic losses. Similarly, regular inspections of the battery system cannot always detect the system operation. That is to say, the problems that have occurred in the battery system cannot be found in time, and the long-term operation after the system has problems will cause irreversible damage to the battery electrodes.