A modular iron-chromium liquid flow long-term energy storage system and configuration method thereof

Abstract

The present invention discloses a modular iron-chromium liquid flow long-term energy storage system and a configuration method thereof, wherein the system includes a power module and a capacity module, wherein the power module and the capacity module are independently arranged, wherein the power module includes a battery stack unit, a power equipment unit, a monitoring and control unit and an auxiliary equipment unit, wherein the power equipment unit is connected to the battery stack unit, the monitoring and control unit is respectively connected to the battery stack unit and the power equipment unit, and the auxiliary equipment unit is independently arranged and integrated with the battery stack unit, the power equipment unit and the monitoring and control unit in a container body. The present invention realizes product standardization, generalization and customization by disassembling the product functions of the iron-chromium liquid energy storage system to form independent modules, and realizes the simplification of the floor space through the reasonable configuration between the modules, improves the flexibility of the configuration of the iron-chromium liquid flow energy storage, and reduces the cost of construction and operation and maintenance.

Description

Technical Field

[0001] The present invention belongs to the technical field of long-term energy storage, and in particular relates to a modular iron-chromium liquid flow long-term energy storage system and a configuration method thereof. Background Art

[0002] Under the transformation and upgrading of the old and new power systems, the controllability and storage of energy have become the core of development. The power generation technology of renewable energy such as wind and solar energy is constantly improving, but due to its inherent instability and discontinuity, long-term energy storage can improve the consumption of new energy and the peak-shaving capacity of the system. Under the trend of technological progress, the construction of long-term energy storage is the general trend. Liquid flow battery is one of the core technologies of long-term energy storage, which has the advantages of safety, large capacity and long life. As of the end of 2023, liquid flow battery accounts for only 1.02% of the electrochemical energy storage that has been put into operation, among which all-vanadium liquid flow battery is relatively mature and has a high degree of commercialization. For iron-chromium liquid flow energy storage, on the one hand, it is necessary to continuously improve innovation through continuous product research and development to meet the increasing personalized needs and complex environmental conditions of customers. On the other hand, it is necessary to use product standardization, generalization and mass production to optimize the cost, R&D production, logistics, sales and service links in the entire life cycle of the product to control the total cost of the product. Therefore, the modularization of iron-chromium liquid flow energy storage products can be used to achieve product standardization, generalization and mass production. However, most iron-chromium flow batteries are still in the verification or demonstration stage and do not yet have the ability for modular integration and large-scale configuration. Summary of the invention

[0003] To solve the above problems, the present invention provides a modular iron-chromium liquid flow long-time energy storage system and a configuration method thereof, so as to solve the problem that the existing iron-chromium liquid flow battery does not have the modular integration and large-scale configuration capabilities.

[0004] A modular iron-chromium liquid flow long-term energy storage system, comprising:

[0005] The power module and the capacity module are independently arranged. The power module adopts a container, which integrates a battery stack unit, a power equipment unit and a monitoring and control unit. The power equipment unit is connected to the battery stack unit to provide power for the battery stack unit to perform charging and discharging energy conversion. The monitoring and control unit is respectively connected to the battery stack unit and the power equipment unit to perform real-time data collection and status monitoring of the battery stack unit, and to perform corresponding regulation on the power equipment unit according to the collected data and monitoring status. The capacity module adopts a storage tank container or a container, which stores an electrolyte solution, which is used to store and release electrical energy through mutual conversion of different electrolyte ions. If the capacity module adopts a storage tank container, the capacity module is configured by adjusting the height of the storage tank container. If the capacity module adopts a container, the capacity module is configured by stacking the containers.

[0006] According to a specific embodiment of the present invention, the power module also includes an auxiliary equipment unit, which is independently arranged and integrated with the fuel cell unit, the power equipment unit and the monitoring and control unit in the container body for absorbing and neutralizing the hydrogen chloride gas generated in the power module.

[0007] According to a specific embodiment of the present invention, a plurality of battery stacks are integrated in the battery stack unit for converting chemical energy into electrical energy through charge and discharge reactions.

[0008] According to a specific embodiment of the present invention, the positive and negative electrolyte circulation pumps and their instrumentation and control components are integrated in the power equipment unit, and the power equipment unit is connected to the battery stack unit through the positive and negative electrolyte circulation pumps.

[0009] According to a specific embodiment of the present invention, a power distribution module and a data monitoring and control module are integrated in the monitoring and control unit, the power distribution module is electrically connected to the electrical equipment in the power module, and the data monitoring and control module is communicatively connected to the battery stack unit and the power equipment unit respectively.

[0010] A configuration method of a modular iron-chromium liquid flow long-time energy storage system, applied to the above modular iron-chromium liquid flow long-time energy storage system, comprising:

[0011] Modular configuration of power modules and energy storage modules according to different energy storage durations, and

[0012] The power modules and energy storage modules are modularly configured according to different floor spaces.

[0013] According to a specific embodiment of the present invention, modular configuration of power modules and energy storage modules according to different energy storage durations includes:

[0014] When the power module is constant, the volume of the capacity module is increased or decreased according to the energy storage duration;

[0015] When the energy storage time is constant, the volume of the capacity module is increased or decreased according to the output power of the power module.

[0016] According to a specific embodiment of the present invention, increasing or decreasing the volume of the capacity module according to the energy storage duration includes:

[0017] If the capacity module uses a storage tank to store positive and negative electrolytes, the volume of the capacity module is increased or decreased by adjusting the height of the storage tank;

[0018] If the capacity module stores positive and negative electrolytes in the form of containers, the volume of the capacity module can be increased or decreased by stacking the containers.

[0019] According to a specific embodiment of the present invention, modular configuration of power modules and energy storage modules according to different floor areas includes:

[0020] When the energy storage capacity is constant, the footprint of the power module and the capacity module are calculated according to different configurations of the 1MW power module and the capacity module, and the configuration corresponding to the smallest footprint is selected as the optimal configuration.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] The present invention provides a modular ferrochromium liquid flow long-term energy storage system and its configuration method. By disassembling the functions of the ferrochromium liquid energy storage system product, modules with independent functions and structures are formed. The standard modular products provided by the present invention provide a basis for customized needs, shortening the product supply cycle of ferrochromium liquid flow energy storage products in various links such as design, research and development, production, logistics, and operation and maintenance in large-scale scene applications. The standardized production process of the factory can also greatly reduce the complexity and difficulty of on-site implementation and reduce costs. The modularization of ferrochromium liquid flow energy storage products realizes product standardization, generalization and customization. Through the reasonable configuration between modules, the floor space is streamlined, which improves the flexibility of ferrochromium liquid flow energy storage configuration while reducing the cost of construction and operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic structural diagram of a modular iron-chromium liquid flow long-term energy storage system provided according to an embodiment of the present invention.

[0025] Figure 2 is a schematic structural diagram of a power module provided according to an embodiment of the present invention.

[0026] Figure 3 It is a structural schematic diagram of a power equipment unit provided according to an embodiment of the present invention.

[0027] Figure 4 It is a schematic diagram of the structure of a monitoring and control unit provided according to an embodiment of the present invention.

[0028] Figure 5 It is a flow chart of a configuration method of a modular iron-chromium liquid flow long-time energy storage system provided according to an embodiment of the present invention.

[0029] Figure 6It is a flow chart of a method for modularly configuring power modules and energy storage modules according to different energy storage durations provided according to an embodiment of the present invention.

[0030] Figure 7 It is a flow chart of a method for increasing or decreasing the volume of a capacity module according to energy storage duration provided in accordance with an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1-power module; 2-capacity module;

[0033] 11- battery stack unit; 12- power equipment unit; 13- monitoring and control unit; 14- auxiliary equipment unit;

[0035] 111-battery stack;

[0036] 121-positive and negative electrolyte circulation pumps; 122-instrumentation and control components;

[0037] 131-power distribution module; 132-data monitoring and control module. DETAILED DESCRIPTION

[0038] In order to make those skilled in the art understand the concept and thought of the present invention more clearly, the present invention is described in detail below in conjunction with specific embodiment.It should be understood that the embodiment provided herein is only a part of all embodiments that the present invention may have.Those skilled in the art, after reading the specification of the application, have the ability to make improvements, transformations, or replacements to part or the whole of the following embodiments, and these improvements, transformations, or replacements are also included in the scope of the present invention.

[0039] In this article, the terms "first", "second" and other similar words are not intended to imply any order, quantity and importance, but are only used to distinguish different elements. In this article, the terms "one", "an" and other similar words are not intended to indicate that there is only one thing, but to indicate that the relevant description is only for one of the things, and the thing may have one or more. In this article, the terms "comprise", "include" and other similar words are intended to indicate logical mutual relations, and cannot be regarded as indicating spatial structural relations. For example, "A includes B" is intended to indicate that B belongs to A logically, but does not mean that B is located inside A in space. In addition, the meanings of the terms "comprise", "include" and other similar words should be regarded as open, rather than closed. For example, "A includes B" is intended to indicate that B belongs to A, but B does not necessarily constitute the whole of A, and A may also include other elements such as C, D, and E.

[0040] In this document, the terms "embodiment", "this embodiment", "one embodiment", and "an embodiment" do not mean that the relevant description is only applicable to a specific embodiment, but rather that the description may also be applicable to one or more other embodiments. Those skilled in the art should understand that in this document, any description of a certain embodiment can be replaced, combined, or combined in other ways with the relevant descriptions in one or more other embodiments, and the new embodiments generated by the replacement, combination, or combination in other ways are easily conceivable by those skilled in the art and fall within the scope of protection of the present invention.

[0041] Example 1

[0042] Additional aspects and advantages of embodiments of the present invention will be described in part in the following description, and will become apparent from the following description, or will be learned through practice of embodiments of the present invention. Figure 1-Figure 4 The embodiment of the present invention provides a modular iron-chromium liquid flow long-term energy storage system, comprising:

[0043] A power module 1 and a capacity module 2, the power module 1 and the capacity module 2 are independently arranged. The power module 1 adopts a container, in which a battery stack unit 11, a power equipment unit 12 and a monitoring and control unit 13 are integrated. The power equipment unit 12 is connected to the battery stack unit 11, and is used to provide power for the battery stack unit 11 to perform charging and discharging energy conversion. The monitoring and control unit 13 is respectively connected to the battery stack unit 11 and the power equipment unit 12, and is used to perform real-time data collection and status monitoring of the battery stack unit 11, and to perform corresponding regulation on the power equipment unit 12 according to the collected data and the monitoring status. The capacity module 2 adopts a storage tank container or a container, in which an electrolyte solution is stored, which is used to store and release electrical energy through mutual conversion of different electrolyte ions. If the capacity module 2 adopts a storage tank container, the capacity module 2 is configured by adjusting the height of the storage tank container. If the capacity module 2 adopts a container, the capacity module 2 is configured by stacking the container.

[0044] The present invention classifies and splits the components with independent functions in the iron-chromium liquid flow energy storage system, and assembles the modules with the same functional attributes into independent units, which is convenient for customized selection and replacement. According to different functional attributes, the iron-chromium liquid flow battery system is divided into a power module 1 and a capacity module 2, and the functions and structures of the two are relatively independent, so as to realize modular design. The rated power of the power module 1 represents the maximum sustainable power that the liquid flow battery can obtain in a charge and discharge cycle. In the embodiment of the present invention, the power module 1 is integrated as a whole using a container, and the box is divided into a stack unit 11, a power equipment unit 12, a monitoring and control unit 13 and an auxiliary equipment unit 14 according to the functions and correlations of the integrated equipment. Each unit realizes the connection of the liquid circuit and the circuit in the module in series and parallel through pipes and cables. Unlike lithium batteries that store electrolytes inside the battery, the electrolytes of iron-chromium liquid flow batteries are stored in external containers, so they can be independently set relative to the power modules. The present invention functionally splits them into capacity modules 2, and the capacity modules 2 can be traditional storage tank containers or containers. The active materials of the iron-chromium flow battery are stored in the electrolyte, and the storage and release of electrical energy are achieved through the mutual conversion of different electrolyte ions.

[0045] The present invention realizes product standardization, generalization and batch production through modularization of ferrochromium liquid flow energy storage products. Analyze and disassemble according to customer needs, utilize the combination configuration of different functional modules to meet different product needs and realize customer customization requirements. Product standardization can enable substitution between similar modules, which can reuse existing parts and existing design experience, as well as the procurement, logistics, manufacturing and service resources throughout the product life cycle. Because the module is the encapsulation of part of the product's functions, product designers do not need to worry about the internal implementation when using a specific module, which reduces the complexity of product engineering, allows R&D personnel to pay more attention to the top-level logic, improves the quality of product engineering management and product reliability, and is also a prerequisite for mass production of products.

[0046] Specifically, a plurality of battery stacks 111 are integrated in the battery stack unit 11 for converting chemical energy into electrical energy through charge and discharge reactions.

[0047] In an embodiment of the present invention, the battery stack 111 is a key device for energy conversion during the charging and discharging reaction of the liquid flow energy storage system. Since the battery stack 111 of the liquid flow energy storage only provides a place for electrochemical reactions, it does not undergo redox reactions itself. The redox reactions of the positive and negative electrodes occur on the surface of the solid electrodes in the circulating liquid aqueous solution, and no phase change occurs in the electrode reaction process. During charging and discharging, the positive and negative electrode electrolytes will be pumped into the battery stack through the electrolyte circulation pump to react respectively. After the reaction is completed, the electrolyte will be pumped back into the external container, and the cycle will repeat. When the electrolyte solution flows parallel to the electrode surface during charging and discharging, a redox reaction occurs, and the current is collected and conducted through the electrode plate, thereby realizing the conversion of chemical energy and electrical energy. The battery stack unit 11 is an integration of the battery stack 111 in the box, so that it can realize the reasonable arrangement and functional integration of the battery stack 111 in the smallest space, and at the same time, the maintenance space during operation and maintenance is reasonably planned.

[0048] Specifically, the power equipment unit 12 is integrated with positive and negative electrolyte circulation pumps 121 and instrumentation and control components 122 thereof, and the power equipment unit 12 is connected to the stack unit 11 via the positive and negative electrolyte circulation pumps 121 .

[0049] In the embodiment of the present invention, the power equipment unit 12 is an integration of the positive and negative electrolyte circulation pumps 121 and the instrumentation and control components 122 thereof, and the storage and release of the electrical energy of different electrolyte ions are achieved through the power provided by the power equipment unit 12.

[0050] Specifically, the monitoring and control unit 13 integrates a power distribution module 131 and a data monitoring and control module 132. The power distribution module 131 is electrically connected to the electrical equipment in the power module 1, and the data monitoring and control module 132 is communicatively connected to the battery stack unit 11 and the power equipment unit 12 respectively.

[0051] In the embodiment of the present invention, the power distribution module 131 is used to provide power support to the electrical appliances and equipment in the power module 1, and the data monitoring and control module 132 is used to perform real-time data collection and status monitoring of the battery stack unit 11, and provide corresponding command feedback, thereby ensuring that the iron-chromium liquid flow battery can regulate the power equipment unit 12 according to the collected information requirements, so that the liquid flow energy storage system can perform charging and discharging reactions stably and safely.

[0052] Specifically, the power module 1 also includes an auxiliary equipment unit 14, which is independently arranged and integrated with the stack unit 11, the power equipment unit 12 and the monitoring and control unit 13 in the container body for absorbing and neutralizing the hydrogen chloride gas generated in the power module 1.

[0053] In the embodiment of the present invention, the iron-chromium flow battery uses the difference in valence state of iron and chromium ions dissolved in hydrochloric acid solution to charge and discharge. Hydrochloric acid is highly volatile, and the volatilized hydrogen chloride gas reacts with water vapor in the air to form small hydrochloric acid droplets. Therefore, the auxiliary equipment unit 14 is configured to absorb and neutralize the generated hydrogen chloride gas to avoid equipment corrosion or human body damage caused by hydrochloric acid droplets.

[0054] Example 2

[0055] Based on the above system, the embodiment of the present invention also provides a configuration method of a modular iron-chromium liquid flow long-term energy storage system, such as Figure 5-Figure 7 As shown, including:

[0056] S1: Modular configuration of power modules and energy storage modules according to different energy storage durations.

[0057] S2: Modular configuration of power modules and energy storage modules according to different floor areas.

[0058] Under a certain concentration, the energy storage capacity of the iron-chromium flow battery depends on the volume of the electrolyte solution. The output power of the iron-chromium flow battery depends on the power module, and the energy storage capacity depends on the capacity module. Since the two modules are independent of each other, they can be flexibly configured according to actual needs during large-scale configuration.

[0059] When the power module is fixed, the capacity module can be reasonably configured by analyzing the energy storage capacity of different durations. The matching method of power module and energy storage module corresponding to different energy storage durations is shown in Table 1:

[0060] Table 1. Matching of power modules and energy storage modules for different energy storage durations

[0061]

[0062] By comparing the data in Table 1, it is found that when the power of the power module is constant, the volume of the capacity module will increase accordingly as the energy storage time increases. When the energy storage time is constant, the volume of the capacity module will also increase as the power of the power module increases.

[0063] Specifically, step S1 further includes modularly configuring the power module and the energy storage module according to different energy storage durations:

[0064] S11: When the power module is constant, the volume of the capacity module is increased or decreased according to the energy storage duration. The capacity module is in different forms and its arrangement is also different, including:

[0065] S111: If the capacity module stores positive and negative electrolytes in the form of a storage tank, the volume of the capacity module is increased or decreased by adjusting the height of the storage tank.

[0066] In a specific embodiment of the present invention, the energy storage capacity can be increased by increasing the volume of the capacity module, thereby achieving capacity expansion. If the capacity module is in the form of a storage tank to store the positive and negative electrolytes respectively, the iron-chromium liquid flow battery system usually uses storage tanks with diameters of 3.5 meters, 4 meters and 4.5 meters respectively. When the diameter of the storage tank remains unchanged, the capacity expansion can be achieved by adjusting the height of the storage tank.

[0067] S112: If the capacity module stores positive and negative electrolytes in the form of containers, the volume of the capacity module is increased or decreased by stacking the containers.

[0068] If the capacity module is integrated in a container, the container usually uses two types of containers: standard container and high cabinet. The capacity module in the form of a container can be expanded by stacking containers. The corresponding relationship between the capacity modules of different sizes of containers and the electrolyte capacity can be seen in Table 2:

[0069] Table 2. Comparison table of container capacity module volume

[0070]

[0071]

[0072] S12: When the energy storage time is constant, the volume of the capacity module is increased or decreased according to the output power of the power module.

[0073] In a specific embodiment of the present invention, the rated power of the power module can be increased by increasing the number of battery stacks. If the rated power of each battery stack is 50kW, a 20-foot standard container power module can be configured with four battery stacks, and the rated power of the module is 200kw. If the container is configured with 6 battery stacks, there is no need to change the length of the container, only the height of the container. By using a 20-foot high container, the rated power of the power module can be increased from 200kW to 300kW without changing the floor area. Similarly, a 25-foot high container can increase the number of battery stacks from 6 to 9, and the rated power of a single container can also be increased from 300kW to 450kW. Therefore, the number of stored battery stacks can be increased by expanding the capacity of the container, thereby effectively increasing the rated power of the power module.

[0074] When configured with different power modules, the area occupied by the energy storage system will directly affect the initial construction cost of the energy storage system. Therefore, the optimal area can be achieved through reasonable configuration between modules, which improves the flexibility of the configuration of the iron-chromium liquid flow energy storage and reduces the cost of construction and operation and maintenance.

[0075] Specifically, step S2 of modularizing the power modules and energy storage modules according to different floor areas further includes:

[0076] When the energy storage capacity is constant, the footprint of the power module and the capacity module are calculated according to different configurations of the 1MW power module and the capacity module, and the configuration corresponding to the smallest footprint is selected as the optimal configuration.

[0077] The initial investment cost of iron-chromium liquid flow energy storage is relatively high. Through the reasonable configuration of power modules and capacity modules, the floor space can be reduced as much as possible while meeting the needs, making the site selection of energy storage more flexible, while reducing the investment in construction costs and improving the economy of iron-chromium liquid flow operation.

[0078] In a specific embodiment of the present invention, when the energy storage capacity is constant, the respective occupied areas are calculated for different configurations of 1MW power modules and capacity modules, so as to find the optimal solution. The comparison of the occupied areas of different 1MW power modules and energy storage module configurations can be seen in Table 3:

[0079] Table 3. Comparison of floor space occupied by different 1MW power modules and energy storage modules

[0080]

[0081] Through the calculation of the occupied area and the comparison of the data in Table 3, it can be found that, under the condition of a certain energy storage capacity, for a 1MW energy storage system composed of tank capacity modules, as the integrated power of the power module increases, the liquid storage capacity of the tank capacity module increases, and the tank diameter increases, the land area occupied by 1MW will show a downward trend. At the same time, through calculation, it is found that due to the large electrolyte capacity and the high integration of the power module, the occupied area of ​​the capacity module is in a dominant position. For the 1MW energy storage system composed of container capacity modules, the occupied area will not show a downward trend with the increase of the integrated power of the power module. This is because the container will expand the occupied area while increasing the capacity, and the tank capacity module can increase the capacity by increasing the tank diameter by increasing the small amount of land. However, it can also be found that for capacity modules with large liquid storage, when a smaller double-layer box is used as a capacity module, the occupied area will be significantly reduced, which has a more obvious advantage.

[0082] In summary, the modular iron-chromium liquid flow long-term energy storage system and configuration method thereof described in the present invention have the following advantages:

[0083] The present invention provides a modular ferrochromium liquid flow long-term energy storage system and its configuration method. By disassembling the functions of the ferrochromium liquid energy storage system product, modules with independent functions and structures are formed. The standard modular products provided by the present invention provide a basis for customized needs, shortening the product supply cycle of ferrochromium liquid flow energy storage products in various links such as design, research and development, production, logistics, and operation and maintenance in large-scale scene applications. The standardized production process of the factory can also greatly reduce the complexity and difficulty of on-site implementation and reduce costs. The modularization of ferrochromium liquid flow energy storage products realizes product standardization, generalization and customization. Through the reasonable configuration between modules, the floor space is streamlined, which improves the flexibility of ferrochromium liquid flow energy storage configuration while reducing the cost of construction and operation and maintenance.

[0084] The above describes in detail the concepts, principles and ideas of the present invention in conjunction with specific implementation methods (including embodiments and examples). Those skilled in the art should understand that the implementation methods of the present invention are not limited to the forms given above. After reading this application document, those skilled in the art can make any possible improvements, substitutions and equivalent forms to the steps, methods, systems and components in the above implementation methods. These improvements, substitutions and equivalent forms should be deemed to fall within the scope of the present invention, and the protection scope of the present invention is subject only to the claims.

Claims

1. A modular iron-chromium liquid flow long-term energy storage system, characterized in that: include: A power module and a capacity module, wherein the power module and the capacity module are independently arranged. The power module adopts a container, in which a battery stack unit, a power equipment unit and a monitoring and control unit are integrated. The power equipment unit is connected to the battery stack unit, and is used to provide power for the battery stack unit to perform charge and discharge energy conversion. The monitoring and control unit is respectively connected to the battery stack unit and the power equipment unit, and is used to perform real-time data collection and status monitoring of the battery stack unit, and to perform corresponding regulation on the power equipment unit according to the collected data and the monitoring status. The capacity module adopts a storage tank container or a container, in which an electrolyte solution is stored, and is used to store and release electrical energy through mutual conversion of different electrolyte ions. If the capacity module adopts a storage tank container, the capacity module is configured by adjusting the height of the storage tank container. If the capacity module adopts a container, the capacity module is configured by stacking containers.

2. The modular iron-chromium liquid flow long-term energy storage system according to claim 1 is characterized in that: The power module also includes an auxiliary equipment unit, which is independently arranged and integrated with the stack unit, the power equipment unit and the monitoring and control unit in a container body for absorbing and neutralizing the hydrogen chloride gas generated in the power module.

3. The modular iron-chromium liquid flow long-term energy storage system according to claim 2 is characterized in that: The battery stack unit integrates a plurality of battery stacks for converting chemical energy into electrical energy through charge and discharge reactions.

4. The modular iron-chromium liquid flow long-term energy storage system according to claim 3 is characterized in that: The power equipment unit is integrated with positive and negative electrode electrolyte circulation pumps and instrumentation and control components thereof, and the power equipment unit is connected to the battery stack unit via the positive and negative electrode electrolyte circulation pumps.

5. The modular iron-chromium liquid flow long-term energy storage system according to claim 4 is characterized in that: The monitoring and control unit integrates a power distribution module and a data monitoring and control module. The power distribution module is electrically connected to the electrical equipment in the power module, and the data monitoring and control module is communicatively connected to the battery stack unit and the power equipment unit respectively.

6. A method for configuring a modular iron-chromium liquid flow long-time energy storage system, the method being applied to the modular iron-chromium liquid flow long-time energy storage system according to claim 5, characterized in that: include: Modular configuration of power modules and energy storage modules according to different energy storage durations, and The power modules and energy storage modules are modularly configured according to different floor spaces.

7. The configuration method of the modular iron-chromium liquid flow long-term energy storage system according to claim 6, characterized in that: The modular configuration of the power module and the energy storage module according to different energy storage durations includes: When the power module is constant, the volume of the capacity module is increased or decreased according to the energy storage duration; When the energy storage time is constant, the volume of the capacity module is increased or decreased according to the output power of the power module.

8. The configuration method of the modular iron-chromium liquid flow long-term energy storage system according to claim 7, characterized in that: The method of increasing or decreasing the volume of the capacity module according to the energy storage duration includes: If the capacity module uses a storage tank to store positive and negative electrolytes, the volume of the capacity module is increased or decreased by adjusting the height of the storage tank; If the capacity module stores positive and negative electrolytes in the form of containers, the volume of the capacity module can be increased or decreased by stacking the containers.

9. The configuration method of the modular iron-chromium liquid flow long-term energy storage system according to claim 8, characterized in that: The modular configuration of the power module and the energy storage module according to different floor areas includes: When the energy storage capacity is constant, the footprint of the power module and the capacity module are calculated according to different configurations of the 1MW power module and the capacity module, and the configuration corresponding to the smallest footprint is selected as the optimal configuration.

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