An aqueous organic flow battery system for microgrids

Abstract

This utility model discloses an aqueous organic flow battery system for microgrids, comprising a main battery stack and an auxiliary battery stack. The main battery stack includes two parallel-connected first battery stack groups, each consisting of multiple battery stacks connected in series. The positive and negative terminals of the main battery stack are connected to the voltage input ports of a first energy storage converter, and the voltage output ports of the first energy storage converter are connected to the two-phase input terminals of the power grid. The auxiliary battery stack includes a second battery stack group consisting of multiple battery stacks connected in series, with the same number of battery stacks as the first battery stack group. The positive and negative terminals of the auxiliary battery stack are connected to the voltage input ports of a DC-DC module, and the voltage output ports of the DC-DC module are connected to the voltage input ports of the second energy storage converter, which in turn is connected to the two-phase input terminals of the power grid. The main and auxiliary battery stacks share a positive electrolyte tank and a negative electrolyte tank. The advantages of this utility model are: high reliability and low cost.

Description

Technical Field

[0001] This utility model relates to the field of battery energy storage technology, specifically to an aqueous organic flow battery system for microgrids. Background Technology

[0002] With the vigorous development of intermittent wind and solar renewable energy at the microgrid level, efficient, safe, and long-duration battery energy storage technology has become a core path to solving the problems of renewable energy consumption and microgrid stability. Aqueous organic flow batteries, with their unique advantages of high safety, long cycle life, and no pollution, are an important solution to meet the needs of large-scale, long-duration energy storage in microgrids.

[0003] Existing aqueous organic flow battery control devices mainly transmit energy to the grid through the battery via an energy storage converter. However, when the battery or electrolyte pipeline is damaged and cannot operate normally, the system stops, resulting in the inability to supply power to the grid, which is unreliable. Furthermore, existing technologies require an electrolyte tank for each positive and negative electrode of each battery stack, resulting in a complex system structure, large footprint, and high structural cost. Utility Model Content

[0004] The technical problem to be solved by this utility model is that the existing water-based organic flow battery control device has poor reliability and high structural cost.

[0005] This utility model solves the above-mentioned technical problems through the following technical means: A water-based organic redox flow battery system for microgrids includes a main stack and an auxiliary stack. The main stack includes two first stack groups connected in parallel. Each first stack group consists of multiple stacks connected in series. The positive and negative terminals of the main stack are connected to the voltage input ports of a first energy storage converter, and the voltage output ports of the first energy storage converter are connected to the two-phase input terminals of the power grid. The auxiliary stack includes a second stack group consisting of multiple stacks connected in series. The number of stacks in the second stack group is the same as that in the first stack group. The positive and negative terminals of the auxiliary stack are connected to the voltage input ports of a DC-DC module. The voltage output ports of the DC-DC module are connected to the voltage input ports of the second energy storage converter, and the voltage output ports of the second energy storage converter are connected to the two-phase input terminals of the power grid. The positive terminals of the main stack and the auxiliary stack are connected to a positive electrolyte tank through pipes, and the negative terminals of the main stack and the auxiliary stack are connected to a negative electrolyte tank through pipes. The main stack and the auxiliary stack share both the positive electrolyte tank and the negative electrolyte tank.

[0006] This invention features a main fuel cell stack and an auxiliary fuel cell stack connected to the power grid, serving as backups for each other. This ensures that if the main fuel cell stack or electrolyte pipeline fails, the auxiliary fuel cell stack can still operate normally, and vice versa. This results in high system reliability. Furthermore, the main and auxiliary fuel cell stacks share both positive and negative electrolyte tanks, significantly reducing the number of electrolyte tanks and floor space required compared to existing technologies, thus greatly lowering structural costs.

[0007] Furthermore, the first fuel cell stack group consists of four fuel cell stacks connected in series, and the second fuel cell stack group consists of four fuel cell stacks connected in series.

[0008] Furthermore, the stacks in the first stack group are arranged in a line in sequence, and the stacks in the second stack group are arranged in a line in sequence and correspond to the positions of the stacks in the first stack, forming an array of 3 rows and 4 columns. The positive electrodes of the stacks in each column share a positive electrolyte tank, and the negative electrodes of the stacks in each column share a negative electrolyte tank.

[0009] Furthermore, the aqueous organic flow battery system for microgrids also includes a positive electrode pump and a negative electrode pump, which are water pumps. The positive electrode of each row of battery stacks is connected to its corresponding positive electrolyte tank through the positive electrode pump, and the negative electrode of each row of battery stacks is connected to its corresponding negative electrolyte tank through the negative electrode pump.

[0010] Furthermore, the aqueous organic flow battery system for microgrids also includes a heat exchanger, wherein the water-cooled pipes of the heat exchanger are located next to the pipes of each positive electrolyte tank and negative electrolyte tank, and the heat of the pipes containing the electrolyte is removed by water cooling.

[0011] Furthermore, the water-based organic flow battery system for microgrids also includes a heating and cooling unit, wherein the hot water inlet of the heating and cooling unit is connected to the outlet of the heat exchanger, and the cold water outlet of the heating and cooling unit is connected to the inlet of the heat exchanger.

[0012] Furthermore, there are multiple heat exchangers, with the outlet of the current heat exchanger connected to the inlet of the next heat exchanger, and the inlet of the current heat exchanger connected to the outlet of the next heat exchanger.

[0013] Furthermore, the heat exchanger is model TL150, and the integrated cooling and heating unit is model YLJ-2A10W.

[0014] Furthermore, the first and second energy storage converters are of the PCS100 series.

[0015] Furthermore, the model number of the DC-DC module is SOFAR 50KTL-G3.

[0016] The advantages of this utility model are:

[0017] (1) In this invention, the main fuel cell stack and the auxiliary fuel cell stack are connected to the power grid respectively, serving as backups for each other. Therefore, when the main fuel cell stack or the electrolyte pipeline fails to operate normally, the auxiliary fuel cell stack can still operate normally, and vice versa. This ensures high system reliability. Furthermore, the main and auxiliary fuel cell stacks share both positive and negative electrolyte tanks, significantly reducing the number of electrolyte tanks and floor space required compared to existing technologies, thus greatly lowering structural costs.

[0018] (2) The present invention is equipped with a heat exchanger, which removes the heat of the pipeline where the electrolyte is located by water cooling, thereby dissipating heat from the pipeline and preventing the electrolyte-related pipeline from working in a high-temperature environment, thus avoiding damage to the battery stack and avoiding adverse effects on the positive and negative electrode reactions of the battery stack. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an aqueous organic flow battery system for microgrids disclosed in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation of a heat exchanger in a microgrid-oriented aqueous organic flow battery system, as disclosed in an embodiment of this utility model. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] like Figure 1 As shown, this embodiment provides an aqueous organic flow battery system for microgrids, including a main stack and an auxiliary stack. The main stack includes two parallel-connected first stack groups, each of which consists of four stacks 1 connected in series. The positive and negative terminals of the main stack are connected to the voltage input port of the first energy storage converter PCS1, and the voltage output port of the first energy storage converter PCS1 is connected to the two-phase input terminal of the power grid.

[0023] The auxiliary fuel cell stack includes a second fuel cell stack group consisting of four fuel cell stacks 1 connected in series. The number of fuel cell stacks 1 in the second fuel cell stack group is the same as that in the first fuel cell stack group. The positive and negative terminals of the auxiliary fuel cell stack are connected to the voltage input ports of the DC-DC module, and the voltage output port of the DC-DC module is connected to the voltage input port of the second energy storage converter PCS2. The voltage output port of the second energy storage converter PCS2 is connected to the two-phase input terminals of the power grid. The positive terminals of the main fuel cell stack and the auxiliary fuel cell stack are connected to the positive electrolyte tank 2 through pipes, and the negative terminals of the main fuel cell stack and the auxiliary fuel cell stack are connected to the negative electrolyte tank 3 through pipes. Specifically, each fuel cell stack 1 in the first fuel cell stack group is arranged as follows: The stacks 1 in the second stack group are arranged in a straight line, corresponding to the positions of the stacks 1 in the first stack group, forming a 3x4 array. Each column of stacks 1 shares a positive electrolyte tank 2 for its positive electrode, and each column shares a negative electrolyte tank 3 for its negative electrode, requiring a total of 4 positive electrolyte tanks and 4 negative electrolyte tanks. In contrast, existing technologies require corresponding electrolyte tanks for each electrode, resulting in 12 positive and 12 negative electrolyte tanks. Therefore, this application significantly reduces the number of electrolyte tanks, reduces the footprint, and lowers structural costs compared to existing technologies. In this embodiment, the first energy storage converter PCS1 and the second energy storage converter PCS2 are Sungrow PCS100 series 200kW and Sungrow PCS100-100kW. The DC-DC module is Sofarsolar SOFAR50KTL-G3.

[0024] like Figure 2 As shown, to facilitate the normal transport of the reaction liquid in the fuel cell stack 1 and avoid affecting its reaction rate, the fuel cell stack 1 is an aqueous organic flow battery. It primarily generates electrical energy through a reversible redox reaction of organic active molecules dissolved in an aqueous electrolyte. The energy is stored in the electrolyte in the tank, and the power is output from the fuel cell stack. This reaction principle is existing technology and is not within the scope of this invention. The fuel cell model is Enerflow-100kW. The aqueous organic flow battery system for microgrids also includes a positive electrode pump 4 and a negative electrode pump 5. The positive electrode pump 4 and negative electrode pump 5 are water pumps. The positive electrode of each row of fuel cell stacks 1 is connected to its corresponding positive electrolyte tank 2 via the positive electrode pump 4, and the negative electrode of each row of fuel cell stacks 1 is connected to its corresponding negative electrolyte tank 3 via the negative electrode pump 5, thus achieving the cyclic transport of the electrolyte.

[0025] Continue reading Figure 2To prevent excessively high temperatures from damaging the circuit and to avoid affecting the reactions of the positive and negative electrodes, a water-based organic flow battery system for microgrids also includes a heat exchanger 6. The water-cooled pipes of the heat exchanger 6 are located next to the pipes of each positive electrolyte tank 2 and negative electrolyte tank 3, and the heat in the pipes containing the electrolyte is removed by water cooling. The hot water inlet of the integrated heating and cooling unit 7 is connected to the outlet of the heat exchanger 6, and the cold water outlet of the integrated heating and cooling unit 7 is connected to the inlet of the heat exchanger 6.

[0026] Continue reading Figure 2 To further improve the heat dissipation effect, as a further improvement of this utility model, there are multiple heat exchangers 6, with the outlet of the current heat exchanger 6 connected to the inlet of the next heat exchanger 6, and the inlet of the current heat exchanger 6 connected to the outlet of the next heat exchanger 6. In this embodiment, the heat exchanger 6 is model TL150 (Universal Hydraulik's TL series plate heat exchanger), and the integrated cooling and heating unit 7 is model YLJ-2A10W (Guanya's YLJ series).

[0027] Through the above technical solution, the main fuel cell stack and auxiliary fuel cell stack of this utility model are respectively connected to the power grid and serve as backups for each other. Therefore, when the main fuel cell stack 1 is damaged or the electrolyte pipeline is damaged and cannot operate normally, the auxiliary fuel cell stack can still operate normally, and vice versa. This ensures high system reliability. Furthermore, the main and auxiliary fuel cell stacks share the positive electrolyte tank 2 and the negative electrolyte tank 3, which significantly reduces the number of electrolyte tanks, the floor space required, and the structural cost compared to existing technologies.

[0028] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. An aqueous organic flow battery system for microgrids, characterized in that, The system includes a main fuel cell stack and an auxiliary fuel cell stack. The main fuel cell stack comprises two parallel-connected first fuel cell stack groups, each consisting of multiple fuel cell stacks connected in series. The positive and negative terminals of the main fuel cell stack are connected to the voltage input ports of a first energy storage converter, and the voltage output ports of the first energy storage converter are connected to the two-phase input terminals of the power grid. The auxiliary fuel cell stack comprises a second fuel cell stack group consisting of multiple fuel cell stacks connected in series. The second fuel cell stack group has the same number of fuel cell stacks as the first fuel cell stack group. The positive and negative terminals of the auxiliary fuel cell stack are connected to the voltage input ports of a DC-DC module, and the voltage output ports of the DC-DC module are connected to the voltage input ports of the second energy storage converter, which in turn is connected to the two-phase input terminals of the power grid. The positive terminals of the main and auxiliary fuel cell stacks are connected to a positive electrolyte tank via pipes, and the negative terminals are connected to a negative electrolyte tank via pipes. The main and auxiliary fuel cell stacks share both the positive and negative electrolyte tanks.

2. The aqueous organic flow battery system for microgrids according to claim 1, characterized in that, The first fuel cell stack group consists of four fuel cell stacks connected in series, and the second fuel cell stack group consists of four fuel cell stacks connected in series.

3. The aqueous organic flow battery system for microgrids according to claim 2, characterized in that, The stacks in the first stack group are arranged in a line in sequence, and the stacks in the second stack group are arranged in a line in sequence and correspond to the positions of the stacks in the first stack group, forming an array of 3 rows and 4 columns. The positive electrodes of the stacks in each column share a positive electrolyte tank, and the negative electrodes of the stacks in each column share a negative electrolyte tank.

4. The aqueous organic flow battery system for microgrids according to claim 3, characterized in that, It also includes a positive electrode pump and a negative electrode pump, which are water pumps. The positive electrode of each column of fuel cells is connected to its corresponding positive electrolyte tank through the positive electrode pump, and the negative electrode of each column of fuel cells is connected to its corresponding negative electrolyte tank through the negative electrode pump.

5. The aqueous organic flow battery system for microgrids according to claim 1, characterized in that, It also includes a heat exchanger, the water-cooled pipes of which are located next to the pipes of each positive electrolyte tank and negative electrolyte tank.

6. The aqueous organic flow battery system for microgrids according to claim 5, characterized in that, It also includes a combined heating and cooling unit, wherein the hot water inlet of the combined heating and cooling unit is connected to the outlet of the heat exchanger, and the cold water outlet of the combined heating and cooling unit is connected to the inlet of the heat exchanger.

7. The aqueous organic flow battery system for microgrids according to claim 5, characterized in that, There are multiple heat exchangers. The outlet of the current heat exchanger is connected to the inlet of the next heat exchanger, and the inlet of the current heat exchanger is connected to the outlet of the next heat exchanger.

8. The aqueous organic flow battery system for microgrids according to claim 6, characterized in that, The heat exchanger is model TL150, and the integrated cooling and heating unit is model YLJ-2A10W.

9. The aqueous organic flow battery system for microgrids according to claim 1, characterized in that, The first and second energy storage converters are of the PCS100 series.

10. The aqueous organic flow battery system for microgrids according to claim 1, characterized in that, The DC-DC module is model SOFAR 50KTL-G3.

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