| abstract |
The invention provides a method for judging the cause of the voltage rise of a single cell of an all-vanadium redox flow battery stack. Content changes, according to the release of CO 2 and CO in the electrolyte and the release rate, determine the reason for the rise of the single-cell battery voltage, when the single-cell battery voltage rises: a, if CO 2 and CO gas are detected, It means that the positive electrode is oxidized, b, if CO 2 and CO gas are not detected, it means that the ohmic internal resistance of the battery is increased. The method of the invention can simply, quickly and accurately determine the reason for the abnormal increase of the voltage of the single cell of the all-vanadium redox flow battery stack during the use process, and take corresponding measures to remove the fault in time, thereby avoiding the need to replace the stack with a relatively high cost. method. |