Liquid flow battery electrolyte storage tank and liquid storage system

Abstract

The utility model relates to a redox flow battery electrolyte storage tank and a liquid storage system, the storage tank comprises an electrolyte storage tank body which is integrally formed by rotational molding, a cavity is formed in the electrolyte storage tank body, a concave platform is formed on one side of the electrolyte storage tank body, an electrolyte circulating pump is placed on the concave platform, and the convex platform is provided with a liquid outlet and a liquid return port. A distribution pipe is installed at the bottom of a cavity of the electrolyte storage tank body, liquid distribution holes are formed in the distribution pipe, the liquid outlet is connected with an electrolyte circulating pump, and the liquid return opening is connected with the distribution pipe. Based on the operation, according to the electrolyte storage tank of the flow battery, electrolyte storage tanks with different volumes can be manufactured according to the requirements of actual projects, the volume of the electrolyte storage tank can be adjusted in time, the production and manufacturing period is shortened, the volume utilization rate is improved, electrolyte can be mixed more uniformly, local dead zones are reduced, and the service life of the electrolyte storage tank is prolonged. And meanwhile, the storage tank also saves the installation and maintenance cost, and is high in economic benefit.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid flow batteries, and more specifically, to a liquid flow battery electrolyte storage tank and a liquid storage system. Background Art

[0002] Flow batteries are a new electrochemical energy storage technology that achieves the mutual conversion of electrical energy into chemical energy through reversible redox reactions in the active substances of the positive and negative electrolyte solutions, that is, reversible changes in valence state. Due to their high safety, long life, and long-term charge and discharge, they are increasingly favored in the energy storage market. Currently, flow batteries are mainly divided into all-vanadium flow batteries, zinc-bromine flow batteries, and zinc-iron flow batteries. Regardless of the type of flow battery, its battery system mainly consists of a capacity unit, a power unit, a battery control and management unit, and pipes and cables connecting various devices. The main function of the capacity unit is to store and supply the electrolyte solution of the flow battery. The electrolyte solution, or electrolyte, is divided into positive and negative electrolytes, which are stored in positive and negative electrolyte storage tanks, respectively.

[0003] The electrolyte storage tanks in the flow battery industry are mostly round or square. Currently, the commonly used round electrolyte storage tanks are mostly made of PP material winding welding or fiberglass molding, while the square electrolyte storage tanks are mostly made of PP plate welding and fiberglass molding.

[0004] The electrolyte storage tanks currently on the market have the following problems: First, the production cycle is long, which is not conducive to project construction; second, they are poorly compatible with containers, and the volume utilization rate is low when installed in the container, and they have poor flexibility. It is impossible to produce electrolyte storage tanks of different heights according to the actual project needs, and the volume of the electrolyte storage tank cannot be adjusted, which is costly; third, the electrolyte is not mixed evenly, and local dead zones are very likely to occur. The distribution pipes in traditional electrolyte storage tanks are usually a single straight structure, which makes it impossible for the electrolyte to diffuse evenly in the tank, resulting in local accumulation of electrolyte and the appearance of flow dead zones. Utility Model Content

[0005] In order to solve the problems of the above-mentioned prior art, the utility model provides a liquid flow battery electrolyte storage tank and liquid storage system. The electrolyte storage tank is rotationally molded in one piece. The molds used in the rotational molding process are spliced together. The volume of the electrolyte storage tank can be adjusted according to actual use needs, shortening the production cycle and achieving high volume utilization when adapted to a container. The distribution pipe ensures that the electrolyte is evenly diffused to the surrounding areas in the storage tank, and the electrolyte is more fully mixed.

[0006] According to one aspect of the utility model, there is provided a liquid flow battery electrolyte storage tank, comprising an electrolyte storage tank body formed by rotational molding, a cavity formed inside the electrolyte storage tank body, a plurality of recessed platforms formed on one side of the electrolyte storage tank body, an electrolyte circulation pump placed on the recessed platform, the recessed platform is provided with a liquid outlet and a liquid return port, a distribution pipe is installed at the bottom of the cavity of the electrolyte storage tank body, and a liquid separation hole is provided on the distribution pipe; the liquid outlet is connected to the electrolyte circulation pump, and the liquid return port is connected to the distribution pipe.

[0007] Through this solution, rotational molding is achieved, and the production cycle is short. At the same time, the mold used is spliced together, and the volume of the electrolyte storage tank can be adjusted according to actual use needs. The setting of the distribution pipe and the liquid separation hole can reduce the occurrence of uneven electrolyte mixing during the electrolyte circulation process, reduce local dead zones, and allow the active substances in the electrolyte to fully participate in the reaction. Because the conventionally used electrolyte circulation pump is a non-self-priming circulation pump, the electrolyte circulation pump is placed on a recessed platform of the electrolyte storage tank body with an appropriate depth. After the electrolyte storage tank is filled with an appropriate volume of electrolyte, the electrolyte circulation pump is always below the liquid level of the electrolyte in the storage tank, thereby achieving the purpose of normal and stable operation of the electrolyte circulation pump. At the same time, placing the electrolyte circulation pump on the recessed platform reduces the container space occupied by placing the pump, increases volume utilization, and is more convenient for daily operation, maintenance or replacement.

[0008] Preferably, the side wall of the electrolyte storage tank body is provided with grooves, wherein one or more of the grooves are installed with temperature sensors, and the remaining grooves are installed with heating belts.

[0009] Through this solution, the setting of the temperature sensor can monitor the temperature of the electrolyte in the electrolyte storage tank in real time. The heating belt is associated with the temperature measurement data of the temperature sensor, which can well control the storage or operating temperature range of the electrolyte, effectively ensuring the performance of the liquid flow battery system product and the stability of the electrolyte operation.

[0010] Preferably, the liquid outlet and the liquid return port are located on one side of the concave platform, and the liquid return port is located above the liquid outlet.

[0011] The electrolyte circulation pump sucks the electrolyte from the storage tank through the liquid outlet and pumps it into the battery for reaction, and then flows back to the storage tank through the return liquid outlet, realizing the circulation of the electrolyte in the electrolyte storage tank and ensuring the normal operation of the liquid flow battery system.

[0012] Preferably, the top of the electrolyte storage tank body is an arc-shaped structure, and is integrally formed with a plurality of arc-shaped reinforcing ribs. The top of the electrolyte storage tank body is also equipped with a manhole for easy installation and maintenance.

[0013] Through this solution, the setting of reinforcing ribs improves the strength of the top of the electrolyte storage tank body, ensuring that the top will not collapse or be damaged when construction and inspection personnel stand on the electrolyte storage tank body to operate; a manhole is set on the top of the electrolyte storage tank body, allowing personnel to enter the electrolyte storage tank body through it to carry out electrolyte storage tank quality inspection, impurity cleaning, and electrolyte distribution pipe construction, as well as subsequent inspection and maintenance during operation.

[0014] Preferably, the electrolyte storage tank body includes a positive electrolyte storage tank body and a negative electrolyte storage tank body, and a connecting pipe interface is provided on the concave platform, and the connecting pipe interface on the positive electrolyte storage tank body is connected to the connecting pipe interface on the negative electrolyte storage tank body through a connecting pipe.

[0015] Preferably, the communicating pipe is in an inverted U shape.

[0016] Through this solution, a connecting pipe interface is provided on the concave platform, and the positive and negative electrolyte storage tank bodies are connected through a connecting pipe with adjustable height. The highest point of the connecting pipe is consistent with the safe liquid level height. In this way, no matter whether the positive electrolyte or negative electrolyte level exceeds the safe height, it can flow into the electrolyte storage tank body of another level through the above-mentioned connecting pipe, ensuring the safe operation of the liquid flow battery system.

[0017] Preferably, a mold is used in the preparation of the electrolyte storage tank body, and the mold is composed of an upper and lower combination. Through this solution, the electrolyte storage tank body is rotationally molded as a whole, and the rotational molding mold used in the rotational molding process includes at least two layers of splicing molds connected upper and lower. By adjusting the number of splicing molds, the height of the electrolyte storage tank body can be adjusted at any time according to actual use needs, and the volume of the electrolyte storage tank can be adjusted. It has high flexibility and can further shorten the production cycle of the electrolyte storage tank, which is beneficial to the construction of the project. And this design method can ensure that the design method of the pipeline system connection and electrical construction used for several electrolyte storage tanks of different volumes is universal, without the need for repeated design, saving time and cost.

[0018] Preferably, the distribution pipe is in a field shape, and the liquid separation holes are evenly arranged. This arrangement can further reduce the occurrence of uneven mixing of the electrolyte and reduce local dead zones.

[0019] On the other hand, the present invention also provides a liquid flow battery electrolyte storage system, comprising the aforementioned liquid flow battery electrolyte storage tank.

[0020] The technical effect of the utility model is that the liquid flow battery electrolyte storage tank can not only produce electrolyte storage tanks of different heights according to the needs of actual projects, but also can adjust the volume of the electrolyte storage tank in time, shortening the production cycle and improving the volume utilization rate in the container; it can also make the electrolyte mixing more uniform, reduce local dead zones, and ensure that the active substances in the electrolyte can fully participate in the reaction. At the same time, the storage tank also saves installation and maintenance costs, and has high economic benefits.

[0021] The utility model adopts a rotational molding mold with upper and lower splicing to prepare the electrolyte storage tank body, which can not only meet the project requirements of configuring different volumes of electrolytes with different capacities and durations, but also ensure that the length and width dimensions of the electrolyte storage tank bodies of several different volumes meet the size requirements in the standard container. The size is only adjusted in the height direction. The pipeline system connection, electrical construction design method, and installation in the container used are universal, without repeated design, saving time and cost.

[0022] The present invention features a recessed design within the electrolyte storage tank body, housing the electrolyte circulation pump. This ensures that the pump's suction port is always filled with electrolyte, effectively resolving the issue of conventional electrolyte circulation pumps being non-self-priming. The placement of the electrolyte circulation pump reduces the container space occupied by the pump, maximizing volume utilization and facilitating subsequent operation and maintenance.

[0023] The design of the connecting pipe interface of the positive and negative electrolyte storage tanks enables the electrolyte in the tank with increased liquid level to flow to another level of electrolyte storage tank through the connecting pipe during the charging and discharging process of the battery system, so that the electrolyte level in each tank is always below the safety line, thereby ensuring the normal and stable operation of the liquid flow battery system.

[0024] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0026] Figure 1 Schematic diagram of the structure of the electrolyte storage tank of the flow battery in this embodiment.

[0027] Figure 2 Schematic diagram of the structure of the positive electrode electrolyte storage tank body in this embodiment.

[0028] Figure 3 Schematic diagram of the structure of the negative electrode electrolyte storage tank body in this embodiment.

[0029] Figure 4Schematic diagram of the layered structure of the rotational molding mold of the positive electrode electrolyte storage tank body in this embodiment.

[0030] Figure 5 Schematic diagram of the layered structure of the rotational molding mold of the negative electrode electrolyte storage tank body in this embodiment.

[0031] In the drawings, the same components are denoted by the same reference numerals; the drawings are not drawn to scale. DETAILED DESCRIPTION

[0032] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention.

[0033] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0034] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0035] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0036] The equipment and parts not shown in the figure are all prior art.

[0037] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0038] Example 1

[0039] like Figures 1 to 5As shown, the flow battery electrolyte storage tank in this embodiment includes an electrolyte storage tank body, a cavity formed inside the electrolyte storage tank body, and the electrolyte storage tank body is generally rectangular in shape. A plurality of recessed platforms 6 are formed on one side, and an electrolyte circulation pump is placed on the recessed platform 6. The recessed platform 6 is provided with a liquid outlet 7 and a liquid return port 14, which are connected to the cavity. The electrolyte storage tank body includes a positive electrolyte storage tank body 1 and a negative electrolyte storage tank body 2. The upper part of the positive electrolyte storage tank body 1 is connected to the negative electrolyte storage tank body 2. A field-shaped distribution pipe 4 is installed at the bottom of the cavity of the electrolyte storage tank body, and liquid separation holes are evenly arranged on the distribution pipe 4; the liquid outlet 7 is connected to the electrolyte circulation pump, and the liquid return port 14 is connected to the distribution pipe 4. The electrolyte storage tank body is integrally formed by rotational molding. The rotational molding process requires the use of a rotational molding mold, which is composed of at least two layers of spliced molds connected upper and lower.

[0040] The electrolyte storage tank body is rotationally molded in one piece. The mold used in the rotational molding process is composed of an upper and lower combination. It can not only adjust the height of the electrolyte storage tank body and the volume of the electrolyte storage tank at any time according to actual use needs, but also has high flexibility. It can also further shorten the production cycle of the electrolyte storage tank, which is beneficial to the construction of the project. The distribution pipe is arranged in a field shape at the bottom of the electrolyte storage tank body, which enhances the diffusion range of the electrolyte, can reduce the occurrence of uneven mixing of the electrolyte during the electrolyte circulation process, reduce local dead zones, and make the electrolyte The active substances in the electrolyte fully participate in the reaction; because the conventionally used electrolyte circulation pump is a non-self-priming circulation pump, the electrolyte circulation pump is placed on a recessed platform of the electrolyte storage tank with an appropriate depth. This can ensure that after the electrolyte storage tank is filled with an appropriate volume of electrolyte, the pump head of the electrolyte circulation pump is always below the liquid level of the electrolyte in the storage tank, thereby achieving the purpose of normal and stable operation of the electrolyte circulation pump. At the same time, placing the electrolyte circulation pump on the recessed platform can reduce the container space occupied by placing the pump, increase the volume utilization rate, and make it easier for daily operation, maintenance or replacement.

[0041] Electrolyte storage tanks are made of high-quality PE material using a roto-molding process. Roto-molding is a relatively mature process and has been widely used in numerous industries. Electrolyte storage tanks manufactured using this process, including all external interfaces, are formed as a single, integral piece without any splicing or welding. While ensuring a perfect roto-molding process and high-quality roto-molded products, this significantly reduces the risk of leakage, ensuring safer storage and use of electrolytes. Furthermore, high-quality roto-molded PE material provides excellent flexibility, allowing tanks to withstand significant deformation without damage. Therefore, roto-molded PE tanks have thinner walls, approximately one-third the thickness of welded PP sheet tanks, reducing transportation costs. Therefore, given the same overall dimensions, roto-molded PE tanks can hold a larger volume of electrolyte than tanks welded from PP sheet. Furthermore, the roto-molding process is automated: once the appropriate weight of PE material is placed into the mold, the process proceeds automatically according to a pre-set process, resulting in high production efficiency. The labor hours required to produce a set of positive and negative electrolyte storage tanks are about 1 / 10 of the labor hours required to weld PP sheets to make the tanks; due to the high production efficiency of the rotational molding process, the small amount of PE raw materials used, the overall light weight, and the small number of operators required for automated production, the cost of the electrolyte storage tanks made by the rotational molding process is low, about 1 / 2 of the cost of the electrolyte storage tanks welded by PP sheets.

[0042] Furthermore, grooves 5 are provided on the side walls of the electrolyte storage tank body, wherein a temperature sensor (not marked in the figure) is installed in one or more grooves 5 , and heating belts (not marked in the figure) are installed in the remaining grooves 5 .

[0043] The temperature sensor allows real-time monitoring of the electrolyte temperature within the electrolyte storage tank. The heating belt, linked to the temperature sensor data, effectively controls the electrolyte storage or operating temperature range, effectively ensuring the performance of the flow battery system and the stability of the electrolyte operation. The groove 5 also effectively reduces the deformation of the electrolyte storage tank body, ensuring its molding tolerance.

[0044] Furthermore, the liquid outlet 7 and the liquid return port 14 are located on one side of the recessed platform 6, the liquid return port 14 is located above the liquid outlet 7, the liquid outlet 7 is connected to the electrolyte circulation pump, and the liquid return port 14 is connected to the distribution pipe 4. The bottom of the distribution pipe 4 is in a field shape and is preferably fixed on the bottom surface of the electrolyte storage tank body. The distribution pipe 4 is made of PE material.

[0045] The electrolyte circulation pump sucks the electrolyte from the electrolyte storage tank body through the liquid outlet 14 and pumps it into the battery for reaction, and then flows back to the storage tank through the liquid return port 7, thereby realizing the normal operation of the liquid flow battery system.

[0046] Furthermore, the top of the electrolyte tank body is curved and integrally formed with multiple curved reinforcing ribs 8. A manhole 3 is also installed on the top of the electrolyte tank body to facilitate installation and maintenance. The provision of the reinforcing ribs 8 increases the strength of the top of the electrolyte tank body, ensuring that the top of the electrolyte tank body will not collapse or be damaged when construction and inspection personnel stand on it to perform operations. The manhole 3 is provided on the top of the electrolyte tank body, allowing personnel to enter the electrolyte tank body to conduct tasks such as electrolyte tank quality inspection, impurity removal, installation of the electrolyte distribution pipe, and subsequent maintenance during operation.

[0047] Furthermore, a connecting pipe interface 9 is provided on the concave platform 6, and the connecting pipe interface 9 on the positive electrode electrolyte storage tank 1 is connected to the connecting pipe interface 9 on the negative electrode electrolyte storage tank 2 through a connecting pipe. The connecting pipe is in an inverted U shape.

[0048] A connecting pipe interface 9 is provided at another height of the recessed platform 6, which connects the positive and negative electrolyte storage tanks through a connecting pipe. The highest point of the connecting pipe is consistent with the safe liquid level. In this way, no matter whether the positive or negative electrolyte level exceeds the safe height, it can flow to the electrolyte storage tank of another level through the above-mentioned connecting pipe, thereby ensuring the safe operation of the liquid flow battery system.

[0049] The rotational molding mold used in preparing the electrolyte storage tank body in this embodiment can be divided into four layers of splicing molds connected upper and lower, including a top splicing mold 10, a second splicing mold 11, a third splicing mold 12 and a bottom splicing mold 13. The top splicing mold 10 is used to form the top, manhole 3, recessed platform 6, reinforcement rib 8, connecting pipe interface 9, liquid outlet 7, return liquid port 14 and groove 5 on the upper part of the electrolyte storage tank body. The second splicing mold 11 and the third splicing mold 12 are used to form the side wall and groove 5 of the electrolyte storage tank body. The bottom splicing mold 13 is used to form the bottom, side wall and groove 5 of the side wall of the electrolyte storage tank body. In addition to the top splicing mold 10 and the bottom splicing mold 13, the volume of the electrolyte storage tank body increased due to the addition of the second splicing mold 11 and the third splicing mold 12 corresponds to the capacity duration of the battery system for a predetermined number of hours.

[0050] When the required electrolyte volume is equal to the rated capacity, the electrolyte tank can be produced by rotationally molding the four-part mold assembly. When the required electrolyte volume decreases by a predetermined number of hours, the second mold 11 is eliminated, and the electrolyte tank body is rotationally molded using the remaining three molds. Alternatively, depending on the application, the second and third molds 11 and 12 can be eliminated, and the electrolyte tank body can be produced using the remaining two molds. For example, a containerized battery system consisting of a 250kW power unit and a 1000kW capacity unit would use approximately 60 cubic meters of vanadium electrolyte, which would be packaged in a 1:1 ratio in volume within the positive and negative electrolyte tank bodies within a 40-foot container of standard length and width. The dimensions of the positive and negative electrolyte tank bodies are 5900x2200x2900mm, with a wall thickness of 12mm. In this case, a four-layer splicing mold is required for the preparation of the electrolyte storage tank body. The containerized battery system product, which is composed of a 250KW power unit and a 750KWh capacity unit, uses a total of approximately 45 cubic meters of vanadium electrolyte, which is canned in a 1:1 volume ratio in the positive and negative electrolyte storage tank bodies in a 40-foot capacity unit container of standard length and width. The dimensions of the positive and negative electrolyte storage tank bodies are: 5900x2200x2300mm, and the wall thickness is designed to be 12mm. In this case, the top layer splicing mold 10, the third layer splicing mold 12, and the bottom layer splicing mold 13 are required for the preparation of the electrolyte storage tank body. This approach can meet the project requirements of configuring different volumes of electrolyte for different capacities and durations. This design method can ensure that the length and width dimensions of the electrolyte storage tanks of several different volumes meet the size requirements of the standard container. The size is adjusted only in the height direction. The piping system connection, electrical construction design method, and installation in the container are universal, eliminating the need for repeated design, saving time and cost.

[0051] The working principle of this embodiment is as follows:

[0052] According to actual use requirements, the mold is assembled into a suitable volume, and then the electrolyte storage tank body is prepared through a rotational molding process. After the positive electrode electrolyte storage tank body 1 is demolded and shaped and passed the inspection, enter the interior of the positive electrode electrolyte storage tank body 1 through the manhole 3, and install and fix the distribution pipe 4 of the positive electrode electrolyte; after the negative electrode electrolyte storage tank body 2 is demolded and shaped and passed the inspection, enter the interior of the negative electrode electrolyte storage tank body 2 through the manhole 3, install and fix the distribution pipe 4 of the negative electrode electrolyte, and then install a wall-mounted temperature sensor at a suitable position on the strip-shaped shallow groove 5 on the outer wall of the positive electrode electrolyte storage tank body 1 and the strip-shaped shallow groove 5 on the outer wall of the negative electrode electrolyte storage tank body 2, and fix them tightly. Electric heating belts of suitable length and shape are symmetrically installed in the remaining strip-shaped shallow grooves 5 and fixed tightly. The return liquid port 14, the liquid outlet 7, and the connecting pipe interface 9 are connected by hot-melt flanges. The corresponding pipelines are connected by flanges and the manhole 3 is sealed after installation. Then the positive electrode electrolyte storage tank body 1 and the negative electrode electrolyte storage tank body 2 are loaded into the capacity unit container. After the above assembly is completed, use a connecting pipe of appropriate length and height to connect and fix the connecting pipe interface 9 of the positive electrode electrolyte storage tank body 1 and the connecting pipe interface 9 of the negative electrode electrolyte storage tank body 2.

[0053] The beneficial effects of this embodiment compared with the prior art are:

[0054] First, compared with electrolyte storage tanks made of traditional PP material welding or electrolyte storage tanks made of fiberglass molding, the use of electrolyte storage tanks made of PE material rotational molding automatic one-piece molding has more advantages, which can greatly reduce the risk of electrolyte leakage, ensure the stable operation of the liquid flow battery system, and improve safety.

[0055] Second, the rotational molding process is stable and mature, and has been stably applied in many industries without obvious technical shortcomings. In addition, the rotational molding process is an automated production process. Compared with the production and processing cycle of PP material welding to make storage tanks, the production efficiency of rotational molding electrolyte storage tanks is greatly improved.

[0056] Third, rotomolded electrolyte tanks do not require additional reinforcement design, have thinner walls, and the PE material is flexible and allows for larger deformations. Therefore, compared to PP welded tanks or fiberglass molded tanks, rotomolded tanks are simpler in design, lighter in weight, and lower in cost.

[0057] Fourth, the rotomolded electrolyte tank body features a segmented mold design in the height direction, allowing for flexible assembly. This allows for the production of electrolyte tanks of varying heights based on project requirements. The capacity of the rotomolded electrolyte tank, and therefore the volume of electrolyte contained within, can be adjusted to match the capacity of different flow battery systems. While ensuring flexibility in electrolyte tank volume, this eliminates the need for re-designing and re-manufacturing rotomolded tank molds to accommodate varying volume requirements, reducing costs.

[0058] Fifth, the design of shallow strip grooves around the electrolyte storage tank body can effectively reduce the deformation of the electrolyte storage tank and ensure its molding tolerance. Combined with the wall-mounted temperature sensor and the electric heating belt of appropriate length and shape, it can well monitor and manage the temperature of the electrolyte in the tank, so that the electrolyte is kept within a reasonable and efficient operating temperature range, thereby improving the performance of the battery system.

[0059] Sixth, due to the large internal volume of the electrolyte storage tank itself and the large amount of electrolyte, during the electrolyte circulation process, it is inevitable that the electrolyte will be unevenly mixed, local dead zones will occur, and some active substances in the electrolyte will not fully participate in the reaction. The design of the electrolyte distribution pipe in the electrolyte storage tank can effectively alleviate the above problems. The design of the electrolyte distribution pipe can make the electrolyte in the storage tank more evenly mixed and circulate more smoothly, effectively improving the utilization rate of the electrolyte.

[0060] Seventh, the concave design of the electrolyte storage tank body, which houses the electrolyte circulation pump, ensures that the electrolyte circulation pump's suction port is always filled with electrolyte, effectively resolving the problem of conventional electrolyte circulation pumps being non-self-priming. The placement of the electrolyte circulation pump also fully considers the convenience of subsequent operation and maintenance.

[0061] Eighth, the design of the connecting pipe interface of the positive and negative electrolyte storage tank bodies enables the electrolyte in the tank with increased liquid level to flow to the other level electrolyte storage tank body through the connecting pipe during the charging and discharging process of the battery system, so that the electrolyte level in each tank is always below the safety line, thereby ensuring the normal and stable operation of the liquid flow battery system. Example 2

[0062] This embodiment provides a liquid flow battery electrolyte storage system, including the aforementioned liquid flow battery electrolyte storage tank.

[0063] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A liquid flow battery electrolyte storage tank, characterized in that: It includes a rotomolded electrolyte storage tank body; a cavity is formed inside the electrolyte storage tank body, and a concave platform (6) is formed on one side. An electrolyte circulation pump is placed on the concave platform (6), and the concave platform (6) is provided with a liquid outlet (7) and a liquid return port (14); a distribution pipe (4) is installed at the bottom of the cavity of the electrolyte storage tank body, and liquid distribution holes are provided on the distribution pipe (4); the liquid outlet (7) is connected to the electrolyte circulation pump, and the liquid return port (14) is connected to the distribution pipe (4).

2. The flow battery electrolyte storage tank according to claim 1, characterized in that: A groove (5) is provided on the side wall of the electrolyte storage tank body, and one or more temperature sensors are installed in one or more of the grooves (5), and heating tapes are installed in the remaining grooves (5).

3. The flow battery electrolyte storage tank according to claim 1, characterized in that: The liquid outlet (7) and the liquid return port (14) are located on one side of the concave platform (6), and the liquid return port (14) is located above the liquid outlet (7).

4. The flow battery electrolyte storage tank according to claim 1, characterized in that: The top of the electrolyte storage tank body is of an arc-shaped structure, and a plurality of arc-shaped reinforcing ribs (8) are integrally formed. A manhole (3) convenient for installation and maintenance is also installed on the top of the electrolyte storage tank body.

5. The flow battery electrolyte storage tank according to claim 1, characterized in that: The electrolyte storage tank body includes a positive electrolyte storage tank body (1) and a negative electrolyte storage tank body (2). A connecting pipe interface (9) is provided on the concave platform (6), and the connecting pipe interface (9) on the positive electrolyte storage tank body (1) is connected to the connecting pipe interface (9) on the negative electrolyte storage tank body (2) through a connecting pipeline.

6. The flow battery electrolyte storage tank according to claim 5, characterized in that: The connecting pipeline is in an inverted U shape.

7. The flow battery electrolyte storage tank according to claim 1, characterized in that: The rotomolding die used in the preparation of the electrolyte storage tank body includes at least two layers of spliced dies connected up and down.

8. The flow battery electrolyte storage tank according to claim 1, characterized in that: The distribution pipe (4) is in a cross shape, and the liquid distribution holes are evenly arranged.

9. A liquid flow battery electrolyte storage system, characterized in that: It includes the flow battery electrolyte storage tank according to any one of claims 1-8.

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