The present invention discloses a flow cell electrode structure, a flow cell battery pack, and a sealing structure of a flow cell battery pack, wherein the density of vertical tow in electrode fibers is greater than the density of parallel tows. The quantity ratio of vertical tow and parallel tow per electrode fiber volume is at least 6: 4. The above-described electrode structure is composed of odd-numbered electrode fibers, and the porosity of each of the other layers is larger than that of the center layer. The electrode structure referred to in the present invention is based on a vertical tow placed vertically on a large surface of an electrode, one can reduce the contact resistance by increasing the contact area of adjacent parts of the electrode surface, and the other has good mechanical performance . This structure reduces the contact resistance by 30% ~ 50% compared to the original structure. Each layer of the electrode described above has a different thickness according to the porosity and the thickness of each layer with the optimized thickness coincides with the porosity after compression. The balance structure by this compression avoids the imbalance of mass transfer when the electrolyte flows through the electrode, By lowering the primary polarization, the inverter boosts the battery energy output at the constant output.
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