Flow battery membrane ion penetration test method

The invention discloses a flow battery membrane ion penetration test method, and belongs to the technical field of flow batteries. The method comprises the following steps: firstly, assembling a flow cell membrane to be tested in a test fixture to form two half cells, then forming two circulation loops of a solution end and a sampling end through a liquid storage tank and a circulation pump, and calculating to obtain a corresponding ion permeability value by testing the concentration of metal ions to be tested in the solution at the sampling end at different time. The test fixture comprises two graphite felts, two sealing frames, two collector plates, two electrode plates and two end plates which are symmetrically arranged in sequence from inside to outside, and a space for mounting a flow battery membrane to be tested is reserved between the two graphite felts. Compared with the prior art, the test fixture is additionally provided with a graphite felt structure, and has the advantages that the test is accura