Flow battery energy storage power station

Abstract

The utility model relates to a flow battery energy storage power station, which comprises at least one energy storage module, and the energy storage module comprises a positive pole capacity bin, a negative pole capacity bin, a positive pole liquid return storage tank and a positive pole liquid conveying storage tank; the negative pole capacity bin comprises a negative pole return liquid storage tank and a negative pole transfusion storage tank; the electric pile power bin comprises at least one electric pile unit, and the electric pile unit comprises a plurality of communicated electric piles; the conveying device is respectively connected with the positive electrode liquid conveying storage tank, the negative electrode liquid conveying storage tank, the positive electrode liquid return storage tank, the positive electrode liquid return storage tank and each electric pile unit, and is used for respectively conveying the anolyte in the positive electrode liquid conveying storage tank and the catholyte in the negative electrode liquid conveying storage tank to each electric pile unit so as to generate chemical reaction in the electric pile; and conveying the reacted anolyte to a positive electrode return liquid storage tank, and conveying the reacted catholyte to a negative electrode return liquid storage tank. The flow battery energy storage power station can avoid the situation that the output power, the output voltage and the like of the electric pile are inconsistent, and has relatively high stability.

Description

Technical Field

[0001] The present application relates to the technical field of liquid flow batteries, and in particular to a liquid flow battery energy storage power station. Background Art

[0002] Since flow batteries store liquid electrolytes externally and the energy storage medium is an aqueous solution, they have high safety performance and long life. They can be combined as needed to achieve autonomous regulation of power and capacity. They have significant advantages in low-cost capacity expansion and have broad application prospects in the field of power system energy storage.

[0003] Traditional liquid flow battery energy storage power stations are usually formed by multiple low-power and low-capacity liquid flow battery units connected in series and in parallel. When the liquid flow energy storage power station is working, there will be problems such as inconsistency in output power and voltage between multiple low-power and low-capacity liquid flow battery units, resulting in unstable output power of the liquid flow battery energy storage power station. Utility Model Content

[0004] Based on this, it is necessary to provide a flow battery energy storage power station with stable output power.

[0005] The present application provides a liquid flow battery energy storage power station, comprising at least one energy storage module, wherein the energy storage module comprises:

[0006] Positive electrode capacity tank, including positive electrode return liquid storage tank and positive electrode infusion storage tank;

[0007] Negative electrode capacity tank, including negative electrode return liquid storage tank and negative electrode infusion storage tank;

[0008] A battery stack power compartment, comprising at least one battery stack unit, wherein the battery stack unit comprises a plurality of connected battery stacks;

[0009] The conveying device is respectively connected to the positive electrode infusion tank, the negative electrode infusion tank, the positive electrode return liquid tank, the negative electrode return liquid tank, and each of the battery stack units, and is used to convey the anolyte of the positive electrode infusion tank and the cathode electrolyte of the negative electrode infusion tank to each of the battery stack units to generate a chemical reaction in the battery stack, and to convey the reacted anolyte to the positive electrode return liquid tank, and convey the reacted cathode electrolyte to the negative electrode return liquid tank.

[0010] In one embodiment, the delivery device comprises:

[0011] A positive electrode transport assembly, connected to the positive electrode liquid return tank, the positive electrode liquid infusion tank and each of the battery stacks in the battery stack unit, respectively, for transporting the anode electrolyte in the positive electrode liquid infusion tank to each of the battery stacks to generate a chemical reaction in the battery stack, and transporting the anode electrolyte after the reaction to the positive electrode liquid return tank;

[0012] A negative electrode transport assembly is respectively connected to the negative electrode liquid return storage tank, the negative electrode liquid infusion storage tank and each of the battery stacks in the battery stack unit, and is used to transport the cathode electrolyte in the negative electrode liquid infusion storage tank to each of the battery stacks so that a chemical reaction occurs in the battery stack, and to transport the cathode electrolyte after the reaction to the negative electrode liquid return storage tank.

[0013] In one embodiment, the positive electrode transport assembly comprises:

[0014] A positive electrode liquid infusion pipeline is arranged between the positive electrode liquid infusion storage tank and the battery stack unit;

[0015] A positive electrode liquid return pipeline is arranged between the battery stack unit and the positive electrode liquid return storage tank; each battery stack is connected to the positive electrode liquid delivery pipeline and the positive electrode liquid return pipeline with different interfaces;

[0016] A first circulation pump, arranged on the positive electrode liquid infusion pipeline;

[0017] A first one-way valve is provided on the positive electrode liquid infusion pipeline to conduct the anode electrolyte from the positive electrode liquid infusion storage tank to the pipeline of the stack unit;

[0018] A second one-way valve is provided on the positive electrode liquid return pipeline to conduct the pipeline of the reacted anolyte from the stack unit to the positive electrode liquid return storage tank;

[0019] At least one first bypass pressure relief valve is arranged at the farthest end of the positive electrode infusion pipeline from the positive electrode infusion tank.

[0020] In one embodiment, the negative electrode transport assembly comprises:

[0021] A negative electrode liquid infusion pipeline is arranged between the negative electrode liquid infusion storage tank and the battery stack unit;

[0022] A negative electrode liquid return pipeline is arranged between the battery stack unit and the negative electrode liquid return storage tank; each battery stack is connected to the negative electrode liquid delivery pipeline and the negative electrode liquid return pipeline with different interfaces;

[0023] A second circulation pump is arranged on the negative electrode liquid infusion pipeline;

[0024] a third one-way valve, arranged on the negative electrode liquid infusion pipeline, to conduct the cathode electrolyte from the negative electrode liquid infusion storage tank to the pipeline of the stack unit;

[0025] a fourth one-way valve, arranged on the negative electrode liquid return pipeline, to conduct the cathode electrolyte after the reaction from the battery stack unit to the negative electrode liquid return storage tank;

[0026] At least one second bypass pressure relief valve is arranged at the pipeline connection between the negative electrode liquid delivery pipeline and the negative electrode liquid return pipeline.

[0027] In one of the embodiments, a plurality of the battery stack units are stacked and arranged in a stacked manner in the direction of gravity.

[0028] In one embodiment, the positive electrode infusion storage tank and the negative electrode infusion storage tank each include a plurality of liquid outlets, and each of the liquid outlets is connected to a corresponding battery stack unit via the conveying device;

[0029] The positive electrode liquid return storage tank and the negative electrode liquid return storage tank each include a plurality of liquid inlets, and each of the liquid inlets is connected to a corresponding battery stack unit via the conveying device.

[0030] In one embodiment, multiple battery stacks in the same battery stack unit are arranged in a two-dimensional or three-dimensional array.

[0031] In one of the embodiments, multiple battery stacks in the battery stack unit are connected in series via wires.

[0032] In one embodiment, a plurality of the battery stack units are connected in series via wires.

[0033] In one embodiment, the flow battery energy storage power station includes a plurality of energy storage modules, wherein the plurality of energy storage modules are arranged sequentially in a first direction; wherein,

[0034] The positive electrode capacity compartment, the stack power compartment and the negative electrode capacity compartment in the same energy storage module are arranged sequentially in the second direction, wherein the first direction intersects with the second direction.

[0035] The above-mentioned liquid flow battery energy storage power station includes at least one energy storage module, and the energy storage module includes a positive electrode capacity bin, a negative electrode capacity bin, a stack power bin and a conveying device. Among them, the positive electrode capacity bin includes a positive electrode return liquid storage tank and a positive electrode infusion storage tank; the negative electrode capacity bin includes a negative electrode return liquid storage tank and a negative electrode infusion storage tank; the stack power bin includes a plurality of stack units, and each stack unit includes a plurality of connected stacks; the conveying device is respectively connected to the positive electrode infusion storage tank, the negative electrode infusion storage tank, the positive electrode return liquid storage tank, the negative electrode return liquid storage tank, and each electric push unit. The conveying device can convey the anolyte of the positive electrode infusion storage tank and the cathode electrolyte of the negative electrode infusion storage tank to each stack unit respectively so that a chemical reaction occurs in the stack to charge or discharge the stack, and can convey the reacted anolyte to the positive electrode return liquid storage tank, and convey the reacted cathode electrolyte to the negative electrode return liquid storage tank. Compared with the method of setting a single storage tank for both the positive and negative electrodes, the present application adopts the method of setting an infusion storage tank and a return liquid storage tank for both the positive and negative electrodes, and storing the unused electrolyte and the electrolyte after the chemical reaction separately, which can avoid the electrolyte after the reaction in the single storage tank (with reduced ion concentration) returning to the storage tank and mixing unevenly with the unused electrolyte, resulting in inconsistent ion concentration of the electrolyte delivered to the battery stack, leading to polarization of the battery stack, thereby causing inconsistent output power and output voltage of the battery stack, and improving the stability of the output power of the liquid flow battery energy storage power station. In addition, the electrolyte in the infusion storage tank in the present application is not diluted by the electrolyte after the chemical reaction, and there is no need to increase the amount of electrolyte to increase the electrolyte concentration, further improving the utilization rate of the electrolyte. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] FIG1 is a top view of a flow battery energy storage power station in one embodiment;

[0038] FIG2 is a schematic diagram of the flow direction of the anolyte and the catholyte in one embodiment;

[0039] Figure 3 A schematic diagram of the structure of a positive electrode transport assembly in one embodiment;

[0040] FIG4 is a schematic diagram of the structure of a negative electrode transport assembly in one embodiment;

[0041] Figure 5 A front view of a liquid flow battery energy storage power station in one embodiment;

[0042] Figure 6A top view of a liquid flow battery energy storage power station in another embodiment.

[0043] Description of reference numerals:

[0044] 10-energy storage module, 100-positive electrode capacity warehouse, 110-positive electrode infusion storage tank, 120-positive electrode return liquid storage tank, 200-negative electrode capacity warehouse, 210-negative electrode infusion storage tank, 220-negative electrode return liquid storage tank, 300-fuel cell power warehouse, 310-fuel cell unit, 311-fuel cell, 400-conveyance device, 411-positive electrode infusion pipeline, 412-positive electrode return liquid pipeline, 413-first circulation pump, 414-first one-way valve, 415-second one-way valve, 416-first bypass pressure relief valve, 421-negative electrode infusion pipeline, 422-negative electrode return liquid pipeline, 423-second circulation pump, 424-third one-way valve, 425-fourth one-way valve, 426-second bypass pressure relief valve. DETAILED DESCRIPTION

[0045] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0047] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.

[0048] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, operations, components, parts or combinations thereof.

[0049] In one embodiment, as shown in FIG1 , a flow battery energy storage power station is provided, comprising at least one energy storage module. The energy storage module comprises a positive electrode capacity bin 100, a negative electrode capacity bin 200, a stack power bin 300 and a conveying device 400 (solid connecting line in FIG1 ). The positive electrode capacity bin 100 comprises a positive electrode infusion storage tank 110 and a positive electrode return liquid storage tank 120, and the negative electrode capacity bin 200 comprises a negative electrode infusion storage tank 210 and a negative electrode return liquid storage tank 220. Anode electrolyte is stored in the positive electrode infusion storage tank 110, and cathode electrolyte is stored in the negative electrode infusion storage tank 210. Exemplarily, the anode electrolyte comprises a solution prepared by dissolving V2O5 in sulfuric acid, mainly comprising V 5+ ions; the cathode electrolyte includes a solution made by dissolving NH4VO3 in sulfuric acid, mainly including V 2+ ions. The stack power compartment 300 includes at least one stack unit 310, and the stack unit 310 includes a plurality of connected stacks 311. Specifically, each stack 311 is connected in series through a pipeline. The conveying device is respectively connected to the positive electrode infusion tank 110, the negative electrode infusion tank 210, the positive electrode return liquid tank 120, the negative electrode return liquid tank 220, and each stack unit 310.

[0050] The battery stack includes a positive plate, a negative plate, and an ion exchange membrane, etc. The ion exchange membrane divides the battery stack into an anode reaction zone and a cathode reaction zone. The conveying device 400 conveys the anolyte of the positive electrode infusion tank 110 and the cathode electrolyte of the negative electrode infusion tank 210 to each battery stack unit 310, respectively, so that a chemical reaction occurs in the battery stack 311. Specifically, the conveying device 400 conveys the anolyte in the positive electrode infusion tank 110 to the anode reaction zone of the battery stack 311, an oxidation reaction occurs, and conveys the cathode electrolyte in the negative electrode infusion tank 210 to the cathode reaction zone of the battery stack 311, and a reduction reaction occurs. Due to the presence of the ion exchange membrane, the anolyte and the cathode electrolyte will not mix. The ion concentration in the anolyte after the oxidation reaction decreases, and the ion concentration in the cathode electrolyte after the reduction reaction also decreases. The conveying device 400 conveys the reacted anolyte to the positive electrode liquid return storage tank 120, and conveys the reacted cathode electrolyte to the negative electrode liquid return storage tank 220. Exemplarily, as shown in FIG2 , the flow direction of the anolyte and cathode electrolyte is illustrated by taking a stack unit as an example. In FIG2 , the solid arrows indicate the liquid path of the anolyte from the positive electrode liquid infusion storage tank 110 to the stack 311, and then to the positive electrode liquid return storage tank 120, and the dotted arrows indicate the liquid path of the cathode electrolyte from the negative electrode liquid infusion storage tank 210 to the stack 311, and then to the negative electrode liquid return storage tank 220.

[0051] In an embodiment of the present application, a flow battery energy storage power station includes at least one energy storage module, and the energy storage module includes a positive electrode capacity bin, a negative electrode capacity bin, a stack power bin, and a conveying device. Among them, the positive electrode capacity bin includes a positive electrode return liquid storage tank and a positive electrode infusion storage tank; the negative electrode capacity bin includes a negative electrode return liquid storage tank and a negative electrode infusion storage tank; the stack power bin includes a plurality of stack units, and each stack unit includes a plurality of connected stacks; the conveying device is respectively connected to the positive electrode infusion storage tank, the negative electrode infusion storage tank, the positive electrode return liquid storage tank, the negative electrode return liquid storage tank, and each electric push unit. The conveying device can respectively convey the anolyte of the positive electrode infusion storage tank and the cathode electrolyte of the negative electrode infusion storage tank to each stack unit to generate a chemical reaction in the stack, so that the stack is charged or discharged, and can convey the reacted anolyte to the positive electrode return liquid storage tank, and convey the reacted cathode electrolyte to the negative electrode return liquid storage tank. Compared with the method of setting a single storage tank for both the positive and negative electrodes, the present application adopts the method of setting an infusion storage tank and a return liquid storage tank for both the positive and negative electrodes, and storing the unused electrolyte and the electrolyte after the chemical reaction separately, which can avoid the electrolyte after the reaction in the single storage tank (with reduced ion concentration) returning to the storage tank and mixing unevenly with the unused electrolyte, resulting in inconsistent ion concentration of the electrolyte delivered to the battery stack, leading to polarization of the battery stack, thereby causing inconsistency in the output power and output voltage of the battery stack, which can improve the stability of the output power of the liquid flow battery energy storage power station. In addition, the electrolyte in the infusion storage tank in the present application is not diluted by the electrolyte after the chemical reaction, and there is no need to increase the amount of electrolyte to increase the electrolyte concentration, which further improves the utilization rate of the electrolyte.

[0052] In one embodiment, the conveying device includes a positive electrode conveying assembly and a negative electrode conveying assembly. The positive electrode conveying assembly is respectively connected to the positive electrode infusion storage tank, the positive electrode return liquid storage tank and each battery stack in the battery stack unit, and the negative electrode conveying assembly is respectively connected to the negative electrode infusion storage tank, the negative electrode return liquid storage tank and each battery stack in the battery stack unit.

[0053] The positive electrode delivery assembly can deliver the anolyte in the positive electrode delivery tank to each battery stack so that a chemical reaction occurs in the battery stack, and deliver the anolyte after the reaction to the positive electrode return tank. The negative electrode delivery assembly can deliver the cathode electrolyte in the negative electrode delivery tank to each battery stack so that a chemical reaction occurs in the battery stack, and deliver the cathode electrolyte after the reaction to the negative electrode return tank.

[0054] It can be understood that the positive electrode transport assembly only transports the anolyte, and the negative electrode transport assembly only transports the catholyte. Before and after the chemical reaction occurs in the battery stack, the anolyte and the catholyte will not mix, which allows both the anolyte and the catholyte to be recycled.

[0055] Further, in one embodiment, if Figure 3As shown, the positive electrode delivery assembly includes a positive electrode liquid delivery pipeline 411, a positive electrode liquid return pipeline 412, a first circulation pump 413, a first one-way valve 414, a second one-way valve 415 and at least one first bypass pressure relief valve 416.

[0056] Among them, the positive electrode infusion pipeline 411 is arranged between the positive electrode infusion storage tank 110 and the battery stack unit 310. The positive electrode return liquid pipeline 412 is arranged between the battery stack unit 310 and the positive electrode return liquid storage tank 120. The first circulation pump 413 and the first one-way valve 414 are both arranged on the positive electrode infusion pipeline 411, and the second one-way valve 415 is arranged on the positive electrode return liquid pipeline 412. The first bypass pressure relief valve 416 is arranged at the farthest end of the positive electrode infusion pipeline 411 from the positive electrode infusion storage tank 110.

[0057] The interfaces of each battery stack 311 connected to the positive electrode infusion pipeline 411 and the positive electrode return pipeline 412 are different. It can be understood that each battery stack 311 includes two interfaces, one interface is connected to the positive electrode infusion pipeline 411 to receive the anode electrolyte from the positive electrode infusion storage tank 120; the other interface is connected to the positive electrode return pipeline 412 to allow the reacted anode electrolyte to flow into the positive electrode return pipeline 412 and then flow into the positive electrode return storage tank 120.

[0058] The anolyte in the positive electrode infusion tank 110 can flow under the pressure of the first circulation pump 413. In addition, the flow rate, flow rate, etc. of the anolyte can be adjusted by the first circulation pump 413. A first one-way valve 414 is provided on the positive electrode infusion pipeline 411, which can conduct the anolyte from the positive electrode infusion tank 110 to the pipeline of the stack unit 310 to prevent the anolyte from flowing back to the positive electrode infusion tank 110. A second one-way valve 415 is provided on the positive electrode return pipeline 412, which can conduct the anolyte after the reaction from the stack unit 310 to the pipeline of the positive electrode return tank 120 to prevent the anolyte after the reaction from flowing back to the stack unit 310.

[0059] When the liquid flow battery energy storage power station is working, there is always anolyte flowing in the positive electrode infusion pipeline 411, and anolyte may accumulate in the part of the pipeline on the positive electrode infusion pipeline 411 farthest from the positive electrode infusion tank 110, causing the liquid pressure of this part of the pipeline to be overloaded, causing the pipeline to rupture, and even causing physical damage to the battery stack. Therefore, a first bypass pressure relief valve 416 is set on the part of the pipeline on the positive electrode infusion pipeline 411 farthest from the positive electrode infusion tank 110, and the positive electrode infusion pipeline 411 and the positive electrode return pipeline 412 are connected through the first bypass pressure relief valve 416 to form a liquid bypass, avoid anolyte accumulation, balance the liquid pressure of this part of the pipeline, and reduce the risk of physical damage to the pipeline and the battery stack.

[0060] In one embodiment, as shown in FIG. 4 , the negative electrode delivery assembly includes a negative electrode liquid delivery pipeline 421 , a negative electrode liquid return pipeline 422 , a second circulation pump 423 , a third one-way valve 424 , a fourth one-way valve 425 and at least one second bypass pressure relief valve 426 .

[0061] Among them, the negative electrode liquid infusion pipeline 421 is arranged between the negative electrode liquid infusion storage tank 210 and the battery stack unit 310. The negative electrode liquid return pipeline 422 is arranged between the battery stack unit 310 and the negative electrode liquid return storage tank 220. The second circulation pump 423 and the third one-way valve 424 are both arranged on the negative electrode liquid infusion pipeline 421, and the fourth one-way valve 425 is arranged on the negative electrode liquid return pipeline 422. The second bypass pressure relief valve 426 is arranged at the farthest end of the negative electrode liquid infusion pipeline 421 from the negative electrode liquid infusion storage tank 210.

[0062] The interfaces of each battery stack 311 connected to the negative electrode infusion pipeline 421 and the negative electrode return pipeline 422 are different. It can be understood that each battery stack 311 includes two interfaces, one interface is connected to the negative electrode infusion pipeline 421 to receive the cathode electrolyte from the negative electrode infusion storage tank 220; the other interface is connected to the negative electrode return pipeline 422 to allow the cathode electrolyte after the reaction to flow into the negative electrode return pipeline 422, and then flow into the negative electrode return storage tank 220.

[0063] The cathode electrolyte in the negative electrode infusion tank 210 can flow under the pressure of the second circulation pump 423. In addition, the flow rate, flow rate, etc. of the cathode electrolyte can also be adjusted by the second circulation pump 423. A second one-way valve 424 is provided on the negative electrode infusion pipeline 421, which can conduct the cathode electrolyte from the negative electrode infusion tank 210 to the pipeline of the stack unit 310 to prevent the cathode electrolyte from flowing back to the negative electrode infusion tank 210. A second one-way valve 425 is provided on the negative electrode return pipeline 422, which can conduct the cathode electrolyte after the reaction from the stack unit 310 to the cathode return tank 220 pipeline to prevent the cathode electrolyte after the reaction from flowing back to the stack unit 310.

[0064] When the liquid flow battery energy storage power station is working, there is always cathode electrolyte flowing in the negative electrode liquid infusion pipeline 421, and cathode electrolyte may accumulate in the part of the pipeline on the negative electrode liquid infusion pipeline 421 farthest from the negative electrode liquid infusion storage tank 210, causing the liquid pressure of this part of the pipeline to be overloaded, causing the pipeline to rupture, and even causing physical damage to the battery stack. Therefore, a second bypass pressure relief valve 426 is set on the part of the pipeline on the negative electrode liquid infusion pipeline 421 farthest from the negative electrode liquid infusion storage tank 210, and the negative electrode liquid infusion pipeline 421 and the negative electrode liquid return pipeline 422 are connected through the second bypass pressure relief valve 426 to form a liquid bypass, avoid cathode electrolyte accumulation, balance the liquid pressure of this part of the pipeline, and reduce the risk of physical damage to the pipeline and the battery stack.

[0065] In one embodiment, Figure 5 As shown, in the direction of gravity, multiple battery stack units 310 are stacked and arranged. By stacking the battery stack units 310 in the direction of gravity, the total output power of the flow battery energy storage power station can be increased and the floor space of the battery stack units can be reduced.

[0066] In one embodiment, please continue to refer to Figure 5 The positive electrode liquid infusion storage tank 110 and the negative electrode liquid infusion storage tank 210 each include a plurality of liquid outlets, each of which is connected to a corresponding battery stack unit 310 via a conveying device. The positive electrode liquid return storage tank 120 and the negative electrode liquid return storage tank 220 each include a plurality of liquid inlets, each of which is connected to a corresponding battery stack unit 310 via a conveying device.

[0067] The positive electrode infusion storage tank 110 and the negative electrode infusion storage tank 210 are both provided with multiple liquid outlets. Correspondingly, the positive electrode return liquid storage tank 120 and the negative electrode return liquid storage tank 220 are both provided with multiple return liquid ports, which can realize the layered distribution of electrolyte when the battery stack units 310 are stacked in the direction of gravity, thereby meeting the electrolyte capacity requirements of each battery stack unit.

[0068] In one embodiment, multiple battery stacks in the same battery stack unit are arranged in a two-dimensional array. Optionally, multiple battery stacks in the same battery stack unit are arranged in a three-dimensional array.

[0069] In one embodiment, multiple battery stacks in a battery stack unit are connected in series through wires, which can increase the output voltage of the battery stack unit and reduce the amount of loop wires used.

[0070] In one embodiment, multiple battery stack units are connected in series through wires, which can increase the total output voltage of the flow battery energy storage power station and reduce the circulating current in the formed circuit loop.

[0071] In one embodiment, Figure 6 As shown, the liquid flow battery energy storage power station includes a plurality of energy storage modules 10, and the number of energy storage modules 10 can be set based on the total power demand of the liquid flow battery energy storage power station. Among them, the plurality of energy storage modules 10 are arranged sequentially in the first direction. The positive electrode capacity bin 100, the battery stack power bin 300 and the negative electrode capacity bin 200 in the same energy storage module 10 are arranged sequentially in the second direction. The positive electrode capacity bin 100 and the negative electrode capacity bin 200 in the same energy storage module 10 are symmetrically arranged. The first direction intersects with the second direction. The connection relationship between the positive electrode capacity bin 100, the negative electrode capacity bin 200, the battery stack power bin 300 and the conveying device 400 in the same energy storage module 10 has been described in the above embodiment and will not be repeated here.

[0072] It should be noted that in the positive electrode capacity bin 100, the positive electrode infusion storage tank 110 and the positive electrode return liquid storage tank 120 can be arranged along the first direction, along the second direction, or along other directions, and the embodiment of the present application does not limit this. In the negative electrode capacity bin 200, the negative electrode infusion storage tank 210 and the negative electrode return liquid storage tank 220 can be arranged along the first direction, along the second direction, or along other directions, and the embodiment of the present application does not limit this.

[0073] The battery power compartment 300 includes a plurality of battery units 310, and each battery unit includes a plurality of connected battery stacks 311. The specific number of battery units 300 and battery stacks 311 can also be set based on the total power demand of the liquid flow battery energy storage power station, and the embodiment of the present application is not limited here. In the battery unit 310, the plurality of battery stacks 311 can be arranged in the form of a two-dimensional array or a three-dimensional array, as long as the plurality of battery stacks of the same battery unit share a set of infusion pipes and return pipes.

[0074] It should be noted that in Figure 6 When the stack power compartment 300 includes two or more stack units 310, a first bypass pressure relief valve 416 needs to be provided at the part of the positive electrode liquid infusion pipeline that is subjected to the largest liquid pressure in each stack unit 310, and a second bypass pressure relief valve 426 needs to be provided at the part of the negative electrode liquid infusion pipeline that is subjected to the largest liquid pressure, so as to avoid the positive electrode liquid infusion pipeline and the negative electrode liquid infusion pipeline from being overloaded with liquid pressure and ruptured.

[0075] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0076] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A liquid flow battery energy storage power station, characterized in that: The invention comprises at least one energy storage module, wherein the energy storage module comprises: Positive electrode capacity tank, including positive electrode return liquid storage tank and positive electrode infusion storage tank; Negative electrode capacity tank, including negative electrode return liquid storage tank and negative electrode infusion storage tank; A battery stack power compartment, comprising at least one battery stack unit, wherein the battery stack unit comprises a plurality of connected battery stacks; The conveying device is respectively connected to the positive electrode infusion tank, the negative electrode infusion tank, the positive electrode return liquid tank, the negative electrode return liquid tank, and each of the battery stack units, and is used to convey the anolyte of the positive electrode infusion tank and the cathode electrolyte of the negative electrode infusion tank to each of the battery stack units to generate a chemical reaction in the battery stack, and to convey the reacted anolyte to the positive electrode return liquid tank, and convey the reacted cathode electrolyte to the negative electrode return liquid tank.

2. The liquid flow battery energy storage power station according to claim 1, characterized in that: The conveying device comprises: A positive electrode transport assembly, connected to the positive electrode liquid return tank, the positive electrode liquid infusion tank and each of the battery stacks in the battery stack unit, respectively, for transporting the anode electrolyte in the positive electrode liquid infusion tank to each of the battery stacks to generate a chemical reaction in the battery stack, and transporting the anode electrolyte after the reaction to the positive electrode liquid return tank; A negative electrode transport assembly is respectively connected to the negative electrode liquid return storage tank, the negative electrode liquid infusion storage tank and each of the battery stacks in the battery stack unit, and is used to transport the cathode electrolyte in the negative electrode liquid infusion storage tank to each of the battery stacks so that a chemical reaction occurs in the battery stack, and to transport the cathode electrolyte after the reaction to the negative electrode liquid return storage tank.

3. The liquid flow battery energy storage power station according to claim 2, characterized in that: The positive electrode transport assembly comprises: A positive electrode liquid infusion pipeline is arranged between the positive electrode liquid infusion storage tank and the battery stack unit; A positive electrode liquid return pipeline is arranged between the battery stack unit and the positive electrode liquid return storage tank; each battery stack is connected to the positive electrode liquid delivery pipeline and the positive electrode liquid return pipeline with different interfaces; A first circulation pump, arranged on the positive electrode liquid infusion pipeline; A first one-way valve is provided on the positive electrode liquid infusion pipeline to conduct the anode electrolyte from the positive electrode liquid infusion storage tank to the pipeline of the stack unit; A second one-way valve is provided on the positive electrode liquid return pipeline to conduct the pipeline of the reacted anolyte from the stack unit to the positive electrode liquid return storage tank; At least one first bypass pressure relief valve is arranged at the farthest end of the positive electrode infusion pipeline from the positive electrode infusion tank.

4. The liquid flow battery energy storage power station according to claim 2, characterized in that: The negative electrode transport assembly comprises: A negative electrode liquid infusion pipeline is arranged between the negative electrode liquid infusion storage tank and the battery stack unit; A negative electrode liquid return pipeline is arranged between the battery stack unit and the negative electrode liquid return storage tank; each battery stack is connected to the negative electrode liquid delivery pipeline and the negative electrode liquid return pipeline with different interfaces; A second circulation pump is arranged on the negative electrode liquid infusion pipeline; a third one-way valve, arranged on the negative electrode liquid infusion pipeline, to conduct the cathode electrolyte from the negative electrode liquid infusion storage tank to the pipeline of the stack unit; a fourth one-way valve, arranged on the negative electrode liquid return pipeline, to conduct the cathode electrolyte after the reaction from the battery stack unit to the negative electrode liquid return storage tank; At least one second bypass pressure relief valve is arranged at the farthest end of the negative electrode infusion pipeline from the negative electrode infusion tank.

5. The liquid flow battery energy storage power station according to claim 1, characterized in that: In the direction of gravity, a plurality of the battery stack units are stacked and arranged.

6. The liquid flow battery energy storage power station according to claim 5, characterized in that: The positive electrode infusion storage tank and the negative electrode infusion storage tank each include a plurality of liquid outlets, and each of the liquid outlets is connected to a corresponding battery stack unit via the conveying device; The positive electrode liquid return storage tank and the negative electrode liquid return storage tank each include a plurality of liquid inlets, and each of the liquid inlets is connected to a corresponding battery stack unit via the conveying device.

7. The liquid flow battery energy storage power station according to claim 1, characterized in that: The multiple battery stacks in the same battery stack unit are arranged in a two-dimensional or three-dimensional array.

8. The liquid flow battery energy storage power station according to claim 1, characterized in that: A plurality of battery stacks in the battery stack unit are connected in series via wires.

9. The liquid flow battery energy storage power station according to claim 1, characterized in that: A plurality of the battery stack units are connected in series via conductive wires.

10. The liquid flow battery energy storage power station according to claim 1, characterized in that: The liquid flow battery energy storage power station includes a plurality of energy storage modules, wherein the plurality of energy storage modules are arranged in sequence in a first direction; wherein, The positive electrode capacity compartment, the stack power compartment and the negative electrode capacity compartment in the same energy storage module are arranged sequentially in the second direction, wherein the first direction intersects with the second direction.

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