Mobile capacity recovery vehicle and capacity recovery system for vanadium redox flow battery

Abstract

The utility model belongs to the technical field of redox flow batteries, and particularly relates to a mobile capacity recovery vehicle and a capacity recovery system for a vanadium redox flow battery. The mobile capacity recovery vehicle comprises a reaction kettle, a pump (4) and a mobile frame; the reaction kettle and the pump (4) are arranged on the movable frame, the reaction kettle is provided with a solid feed port (1) and a liquid feed port (2), one end of the pump (4) is communicated to an outlet at the bottom of the reaction kettle, and the other end of the pump (4) is communicated to the discharge port (3). The set of mobile capacity recovery equipment can correspond to dozens of modules, almost no other equipment needs to be added, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of liquid flow batteries, and in particular relates to a mobile capacity recovery vehicle and a capacity recovery system for vanadium liquid flow batteries. Background Art

[0002] During the use of vanadium flow batteries, side reactions, ion migration, and changes in battery internal resistance will occur. Among them, the side reactions and the migration of positive and negative vanadium ions through the ion conductive membrane have the greatest and most obvious impact on capacity. These factors will cause the comprehensive valence state of the positive and negative electrolyte solutions of the battery system to shift. Whether it is a positive or negative shift, it will eventually lead to capacity attenuation. Therefore, after the valence state shifts, it needs to be adjusted back.

[0003] Most of the methods for recovering electrolyte capacity disclosed in the prior art (CN117747878A, CN117727988A, CN117374324A, CN116387583A) have the following disadvantages: 1. Organic matter or gas needs to be introduced, which has a certain impact on the performance of the inorganic vanadium electrolyte. 2. More processing steps are required in the liquid tank, and it may be necessary to add equipment to each electrolyte tank, resulting in complex equipment and high cost.

[0004] In order to solve the above problems, this application is proposed. Utility Model Content

[0005] In the process of implementing this application, the inventor discovered that:

[0006] For the electrolyte capacity recovery process, in the use of large-scale energy storage power stations, it is necessary to reduce the reserved parts of the electrolyte tank as much as possible. It is best to share a set of capacity recovery equipment for multiple sets of modules to reduce the overall cost. The present application found that due to the different locations of multiple sets of electrolyte tanks, the shared electrolyte capacity recovery equipment can be made mobile.

[0007] In this way, when the electrolyte tank needs to restore capacity, it is only necessary to move the mobile capacity recovery vehicle of the present application to the module that needs to be balanced to achieve valence adjustment and capacity recovery. In large grid-side energy storage, when there are dozens or even hundreds of modules, a set of mobile capacity recovery vehicles of the present application can be shared.

[0008] In a first aspect, the present application provides a mobile capacity recovery vehicle for a vanadium flow battery, the mobile capacity recovery vehicle comprising: a reactor, a pump 4, and a mobile frame;

[0009] The reactor and the pump 4 are arranged on the mobile frame. The reactor is provided with a solid feed port 1 and a liquid feed port 2. One end of the pump 4 is connected to the bottom outlet of the reactor, and the other end of the pump 4 is connected to the discharge port 3.

[0010] Preferably, a jacket 5 is provided on the outer periphery of the reactor to control the temperature inside the reactor.

[0011] Preferably, a filter is provided on the pipeline between the reactor and the pump 4 to filter particles in the solution.

[0012] Preferably, the pump is a reciprocating pump.

[0013] A second aspect of the present application provides a capacity recovery system for a vanadium flow battery, comprising: an electrolyte tank and the mobile capacity recovery vehicle described in the first aspect;

[0014] The discharge port 3 of the mobile capacity recovery vehicle is connected to the electrolyte tank to achieve liquid exchange between the reactor and the electrolyte tank.

[0015] Compared with the prior art, this application has the following beneficial effects:

[0016] 1. A set of mobile capacity recovery equipment in this application can correspond to dozens of modules, and almost no other equipment needs to be added, thus saving costs.

[0017] 2. This application does not introduce other balancing organic matter, etc.

[0018] 3. The electrolyte added to the reactor can be used as an electrolyte with adjusted valence state for other equipment, or it can be directly added to the module if the module has spare electrolyte tank volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of the mobile capacity recovery vehicle of this application. DETAILED DESCRIPTION

[0020] The present application is further described in detail below in conjunction with embodiments.

[0021] Those skilled in the art will appreciate that the following examples are only used to illustrate the present application and should not be considered to limit the scope of the present application. If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the art or the product specifications are used. If the manufacturer of the materials or equipment used is not specified, they are all conventional products that can be purchased.

[0022] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" to another element, it may be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used herein may include wireless connections.

[0023] In the description of this application, unless otherwise specified, "plurality" means two or more. The terms "inside", "upper", "lower", etc. indicate positions or state relationships based on the positions or state relationships shown in the drawings, which are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operate in a specific position, and therefore cannot be understood as limiting this application.

[0024] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application are understood according to specific circumstances.

[0025] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0026] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] If not otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution. If not otherwise specified, all technical features and optional technical features of the present application can be combined with each other to form a new technical solution. If not otherwise specified, all steps of the present application can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or may include steps (b) and (a) performed sequentially. For example, the method may further include step (c), indicating that step (c) may be added to the method in any order, for example, the method may include steps (a), (b) and (c), or may include steps (a), (c) and (b), or may include steps (c), (a) and (b), etc.

[0028] If there is no special explanation, the "include" and "comprising" mentioned in this application are open-ended or closed-ended. For example, the "include" and "comprising" may mean that other components not listed may also be included or only the listed components may be included or only the listed components may be included.

[0029] If not specifically stated, in this application, the term "or" is inclusive. For example, the phrase "A or B" means "A, B, or both A and B".

[0030] A mobile capacity recovery vehicle for a vanadium liquid flow battery, the mobile capacity recovery vehicle comprising: a reactor, a pump 4, and a mobile frame;

[0031] The reactor and the pump 4 are arranged on the mobile frame. The reactor is provided with a solid feed port 1 and a liquid feed port 2. One end of the pump 4 is connected to the bottom outlet of the reactor, and the other end of the pump 4 is connected to the discharge port 3.

[0032] Preferably, a jacket 5 is provided on the outer periphery of the reactor to control the temperature inside the reactor.

[0033] Preferably, a filter is provided on the pipeline between the reactor and the pump 4 to filter particles in the solution.

[0034] Preferably, the pump is a reciprocating pump.

[0035] A vanadium liquid flow battery capacity recovery system, comprising: an electrolyte tank and the above-mentioned mobile capacity recovery vehicle;

[0036] The discharge port 3 of the mobile capacity recovery vehicle is connected to the electrolyte tank to achieve liquid exchange between the reactor and the electrolyte tank.

[0037] The electrolyte tank is a positive electrode electrolyte tank or a negative electrode electrolyte tank.

[0038] like Figure 1 The mobile capacity recovery vehicle is composed of a pump, a reactor, a mobile frame, a flange interface, etc.

[0039] The use of the mobile capacity recovery vehicle is as follows:

[0040] Conventional vanadium battery energy storage systems take electrolyte samples every six months to one year and send them to the laboratory for testing. When a valence shift is detected and capacity recovery is required (usually the equilibrium valence is 3.5, and the valence shifts to greater than 3.6 or less than 3.4, which requires recovery. A valence below 3.4 rarely occurs, and it is usually due to side reactions that cause the valence to become higher and higher). First calculate the required amount of solid pentavalent vanadium (vanadium pentoxide) or trivalent vanadium (vanadium trioxide). (Pentavalent vanadium can be used to increase the valence, and trivalent vanadium can be used to reduce the valence).

[0041] Then, the required solid vanadium pentoxide or vanadium trioxide is added to the reactor through the solid feed port 1 of the mobile capacity recovery vehicle. Acid and water in a corresponding ratio to the electrolyte are added from the liquid feed port 2 at a temperature between 50 and 80 degrees to dissolve the solid reaction.

[0042] Then connect the discharge port 3 (quick line interface) on the mobile capacity recovery vehicle to the reserved interface of the electrolyte tank, and then use the pump 4 to exchange the electrolyte. Preferably, the pump is a reciprocating pump, and only one pump is needed.

[0043] Of course, the pump can also be a one-way pump. In this case, a pipeline needs to be connected from the electrolyte tank to use another one-way pump to return the electrolyte to the reactor.

[0044] The electrolyte tank that is usually exchanged is the positive electrode electrolyte tank (the side reaction in the positive electrode electrolyte tank causes the electrolyte valence to increase). Vanadium trioxide and acid solution are added to the reactor. After the vanadium trioxide reacts and dissolves, trivalent vanadium ions are obtained. After exchanging liquid with the positive electrode tank, the trivalent vanadium reduces the excess pentavalent vanadium ions.

[0045] When the chemical reaction in the reactor is not easy to be fully completed, you can choose to add a filter in the pipeline to block the passage of solid particles.

[0046] For example, when the valence of vanadium in the electrolyte tank is low (the valence is lower than 3.5), pentavalent vanadium needs to be added to increase the valence.

[0047] Since vanadium pentoxide has a low solubility in acid and takes a long time to dissolve, the filter can block the passage of pentavalent vanadium solid particles. If the reactor is connected to the negative electrode electrolyte tank, after adding acid and vanadium pentoxide to the reactor, the lower valence vanadium electrolyte (containing divalent and trivalent vanadium) in the negative electrode electrolyte tank is transported to the reactor by the pump, which can help dissolve pentavalent vanadium solid particles (vanadium pentoxide) and reduce pentavalent vanadium. After the electrolyte is introduced into the reactor, it is exchanged several times to completely dissolve the solid, and the entire electrolyte is between 3.48 and 3.52, and the valence adjustment is completed.

[0048] The dissolution reaction in the reactor usually needs to be carried out between 50 and 80 degrees, and the reaction temperature can be controlled by using the jacket 5 on the reactor. The jacket 5 can be electrically heated or the reserved interface of the hot water electrolyte tank can use the reserved mixing interface of the electrolyte tank itself.

Claims

1. A mobile capacity recovery vehicle for vanadium redox flow batteries, characterized in that: The mobile capacity recovery vehicle comprises: a reaction kettle, a pump (4), and a mobile frame; The reactor and the pump (4) are arranged on the mobile frame; the reactor is provided with a solid feed port (1) and a liquid feed port (2); one end of the pump (4) is connected to the bottom outlet of the reactor, and the other end of the pump (4) is connected to the discharge port (3).

2. The mobile capacity recovery vehicle for vanadium redox flow batteries according to claim 1, characterized in that: A jacket (5) is arranged on the outer periphery of the reactor to control the temperature inside the reactor.

3. The mobile capacity recovery vehicle for vanadium redox flow batteries according to claim 1, characterized in that: A filter is provided on the pipeline between the reaction kettle and the pump (4) to filter particles in the solution.

4. The mobile capacity recovery vehicle for vanadium redox flow batteries according to claim 1, characterized in that: The pump is a reciprocating pump.

5. A capacity recovery system for a vanadium redox flow battery, characterized in that: It comprises: an electrolyte tank and the mobile capacity recovery vehicle according to claim 1; The discharge port (3) of the mobile capacity recovery vehicle is connected to the electrolyte tank to achieve liquid exchange between the reactor and the electrolyte tank.

Images