Flow battery stack with monitoring system

[0072] According to a preferred embodiment of the present invention, the fixing device further includes a positioning plate, which is arranged on one side of the pole plate 2 formed by assembling various pole plate parts to fix each pole plate part; and the positioning plate is provided with The through hole corresponding to the measurement port 20 . The positioning plate can keep the assembled electrode plate 2 from being deformed, and the positioning plate is provided with a through hole corresponding to the measurement port 20 , which will not affect the insertion of the measurement probe 23 and is easy to assemble. Preferably, the positioning plate can be selected from materials with good electrical conductivity, such as copper, stainless steel, etc., so that after assembling different plates 2 into a battery, good electrical conductivity can be achieved between the adjacent positive and negative plates, so that all The measured relevant parameters can be closer to the actual