PROBLEM TO BE SOLVED: To provide a flow-power-storage system which can be installed in a small-scale facility or device, or a vehicle with its safety ensured; a vehicle having such a flow-power-storage system; and a method for ensuring the safety of such a flow-power-storage system.SOLUTION: A flow-power-storage system comprises: a battery main body including a solid negative electrode active material made of metallic lithium, and a solid electrolyte; an external tank which contains a liquid positive electrode material including a sulfur-containing positive electrode active material, an electrolytic solution and a conductive assistant, is provided outside the battery main body, and communicates with the battery main body; and one or more hydrogen sulfide detoxication means provided close to the battery main body and/or the external tank. In addition, a vehicle which comprises the flow-power-storage system, and a method for ensuring the safety of the flow-power-storage system are provided.
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