Stack of redox-flow electrochemical cells with decreased shunt

A stack of several electrochemical cells, the electrochemical cells being stacked on top of one another in a stacking direction, the stack comprising at least:

• a first electrochemical cell,
• a second electrochemical cell, and
• an intercalary plate,
• each cell including an upper frame housing a first electrode and a lower frame housing a second electrode, the first electrode and the second electrode being separated from one another by a membrane, the first electrode being in contact with the membrane by its lower face and the second electrode being in contact with the membrane by its upper face, the second electrode of the first electrochemical cell and the first electrode of the second electrochemical cell being separated by the intercalary plate,
• wherein the stack includes an intercalary frame arranged on the periphery of the intercalary plate, the lower frame of the first electrochemical cell and the upper frame of the second electrochemical cell being separated at least in part by the intercalary frame, the lower frame of the first electrochemical cell facing the intercalary frame by its lower face and the upper frame of the second electrochemical cell facing the intercalary frame by its upper face,
• wherein the upper frame and the lower frame of each electrochemical cell are separated from one another by the membrane,
• wherein each upper and lower frame comprises a proximal portion close to the membrane and a distal portion distant from the membrane,
• wherein each upper and lower frame comprises a supply channel for supplying an electrochemical fluid and an inlet channel for a fluid supplying a lateral face of the electrode, the inlet channel comprising an outlet orifice in the proximal portion opening onto a lateral face of the electrode,
• wherein each upper and lower frame comprises a discharge channel for an electrochemical fluid and an outlet channel for the fluid via a lateral face of the electrode, the outlet channel comprising an inlet orifice in the proximal portion opening onto a lateral face of the electrode, and
• wherein the inlet channel comprises an inlet orifice opening onto the supply channel in the distal portion of the upper or lower frame and/or the outlet channel comprises an outlet orifice opening onto the discharge channel in the distal portion of the upper or lower frame.