CN-122000377-A - Self-adaptive sealed flow battery

Abstract

The disclosure relates to an adaptive sealed flow battery comprising a self-sealing electrolyte comprising a curing aid that cures in the presence of oxygen. The flow battery provided by the disclosure can solve the problem that leakage points cannot be repaired in time when a galvanic pile operates.

Inventors

• REN DAYONG
• JIANG MINGZHE
• WANG SHAOLIANG
• CUI SHUANGSHUANG

Assignees

• 国家能源投资集团有限责任公司
• 北京低碳清洁能源研究院

Dates

Publication Date

20260508

Application Date

20241108

Claims (10)

1. 1. The self-sealing flow battery is characterized by comprising self-sealing electrolyte, wherein the self-sealing electrolyte comprises a curing auxiliary agent, and the curing auxiliary agent is cured in the presence of oxygen.
2. 2. The flow battery according to claim 1, wherein the curing auxiliary agent is selected from one or more of an acrylic acid-based adhesive and a polyurethane acrylate oligomer and a polyurethane acrylate prepolymer, and preferably the acrylic acid-based adhesive comprises one or more of acrylic acid and an acrylate monomer; Optionally, the polymerization degree of the polyurethane acrylate oligomer is 2-5, preferably 3-4, and the polymerization degree of the polyurethane acrylate prepolymer is 1-2, preferably 2.
3. 3. The flow battery of claim 1, wherein the curing aid is present in an amount of 1-5 wt%, based on the total weight of the electrolyte.
4. 4. The flow battery of claim 3, wherein the curing aid is present in an amount of 2 to 3wt%, based on the total weight of the electrolyte.
5. 5. The flow battery of claim 1, wherein the electrolyte further comprises an acid, a salt compound, and a solvent, the salt compound comprising a metal salt and/or an ammonium salt.
6. 6. The flow battery of claim 5, wherein the metal salt is selected from one or more of vanadium, zinc, potassium and sodium salts; Optionally, the vanadium salt comprises ammonium metavanadate, the total vanadium ion concentration in the electrolyte is 1.0-3.5 mol/L, optionally, the zinc salt comprises zinc bromide, the zinc bromide concentration in the electrolyte is 2.0-2.5 mol/L, optionally, the potassium salt comprises potassium chloride, the potassium chloride concentration in the electrolyte is 0.01-0.05 mol/L, optionally, the sodium salt comprises sodium chloride, the sodium chloride concentration in the electrolyte is 0.01-0.1 mol/L, optionally, the ammonium salt comprises ammonium chloride, and the ammonium chloride concentration in the electrolyte is 0.01-0.1 mol/L.
7. 7. The flow battery according to claim 5, wherein the acid is one or both of sulfuric acid and hydrochloric acid, preferably the acid content is 25-35 wt%, preferably 28-33 wt%, based on the total weight of the electrolyte.
8. 8. The flow battery of claim 5, wherein the solvent comprises deionized water, and preferably the solvent is present in an amount of 55-70 wt% based on the total weight of the electrolyte.
9. 9. The flow battery of claim 1, wherein two annular wire seal grooves are provided on the electrode frame surface of the flow battery, and an elastic sealing element is provided in the annular wire seal grooves.
10. 10. The flow battery of claim 9, wherein the elastic sealing element is made of one of ethylene propylene diene monomer rubber, fluororubber, polypropylene and polytetrafluoroethylene.

Description

Self-adaptive sealed flow battery Technical Field The application relates to the technical field of flow batteries, in particular to a self-adaptive sealed flow battery. Background The flow battery has the characteristics of good safety, long service life, large electric storage capacity, separation and adjustability of power and capacity and the like, can ensure stable output of new energy after storage adjustment, and realizes the important function of large-scale electric energy management. The standard open circuit voltage of the single cells of the flow battery is smaller, and a certain number of single cells are required to be assembled into a pile in series to obtain the required voltage in order to meet the practical application. When the battery is operated, the flowing circulation of the electrolyte in the electric pile, the liquid storage tank and the pipeline system is realized through the operation of the pump system, but due to the property of the electrolyte and the design of a sealing structure and a connecting structure in the flow battery, the leakage of the electrolyte is a common problem of the flow battery. Currently, the sealing method for realizing the electrolyte is commonly used by adopting a sealing gasket inside the battery and externally reinforcing the battery by bolts. The leakage of electrolyte during operation of a galvanic pile not only affects the performance of the flow battery, but also causes safety problems, so that a novel sealing scheme is developed, the sealing reliability is improved, and the method has important significance for the development of the flow battery. CN103840180a discloses that an annular line sealing groove is provided on an electrode frame of a flow battery, wherein an intersecting line between the line sealing groove and the surface of the electrode frame is two annular lines, and the solution is convenient for installing a line sealing adhesive tape, reduces the probability of kinking and dislocation when the sealing adhesive tape is installed on the surface of the electrode frame, but has poor sealing effect on a common runner hole of electrolyte, and easily causes the electrolyte to leak to the outside of a galvanic pile, and most importantly, cannot timely solve the problem of leakage possibly occurring during operation. CN107123824a discloses that the side of the electric pile perpendicular to the plane of the bipolar plate can be encapsulated by an encapsulation end plate, the encapsulation end plate is made of a polymer material, and the encapsulation end plate is encapsulated on the side of the electric pile perpendicular to the plane of the bipolar plate by physical means or chemical means, and the encapsulation modes include bonding, welding, chemical bonding and the like. Although the scheme provides a solution that the sealing gasket is not required to be designed in the flow battery pile to realize battery sealing, a series of problems that the pile single cells cannot be disassembled and reused after being damaged, and the positive electrode frame and the negative electrode frame cannot be accurately matched exist in a matching mode such as gluing and welding, and the practicability is poor. CN116053507a discloses a flow battery sealing structure with three layers of sealing, this scheme has increased the area of contact of sealing material and membrane owing to the existence of face seal, has reduced because the line seal atress leads to the damage of membrane, has avoided the risk of electric pile internal leakage, but can't avoid the leakage that the flow battery electric pile probably takes place when the operation, can't in time restore the leak source problem that the electric pile operation in-process appears. Disclosure of Invention The purpose of the present disclosure is to provide a self-adaptive sealed flow battery to solve the problem that the leakage point can not be repaired in time when the galvanic pile is operated. In order to achieve the above purpose, the present disclosure provides an adaptively sealed flow battery, which comprises a self-sealing electrolyte, wherein the self-sealing electrolyte comprises a curing auxiliary agent, and the curing auxiliary agent is cured in the presence of oxygen. Optionally, the curing auxiliary agent is selected from one or more of acrylic adhesives, polyurethane acrylate oligomers and polyurethane acrylate prepolymers; Preferably, the acrylic adhesive comprises one or more of acrylic acid and acrylic ester monomers, optionally, the polymerization degree of the polyurethane acrylic ester oligomer is 2-5, preferably 3-4, and the polymerization degree of the polyurethane acrylic ester prepolymer is 1-2, preferably 2. Optionally, the content of the curing auxiliary agent is 1-5 wt% based on the total weight of the electrolyte. Optionally, the content of the curing auxiliary agent is 2-3 wt% based on the total weight of the electrolyte. Optionally, the electrolyte further comprises