Offshore wind power storage system and power grid system

Abstract

The invention relates to an offshore wind power energy storage system and a power grid system, according to offshore wind power energy storage, chemical energy stored in an electrified positive electrode liquid and an electrified negative electrode liquid is transported to mainland through a sea-land shipping ship so as to be supplied to a primary battery stack on land for power generation, and a non-electrified positive electrode liquid and a non-electrified negative electrode liquid which release energy are transported to the sea through a sea-land shipping ship so as to be supplied to the power grid system. And the electric pile can be recycled by an offshore electrolytic tank electric pile. Offshore wind energy is firstly converted into chemical energy which can be stored in the electrolyte, the chemical energy of the electrolyte can be continuously and stably converted into land electric energy by utilizing the transportability of the electrolyte and the recycling of the electrolyte, the requirements of high reliability and stability of a land power grid are met, the problems of consumption and transportation of offshore wind power are effectively solved, and the economic benefit is improved. And the grid connection efficiency of offshore wind power generation is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to an offshore wind power energy storage system and a power grid system. Background Art

[0002] With the vigorous development of the renewable energy industry, the proportion of renewable energy in the energy structure has increased significantly, among which the proportion of wind power generation has increased year by year. In the process of continuous technological advancement and rapid development of the times, the site selection of wind turbines is continuously expanding to the sea in order to obtain more abundant wind resources.

[0003] In related technologies, offshore wind turbines are generally used in conjunction with lithium battery energy storage systems or hydrogen energy storage systems to obtain electricity and transport the electricity to land for grid connection. However, offshore wind turbines are far from shore and offshore wind energy has obvious intermittent and volatile characteristics, making it difficult to match the high reliability and stability requirements of land power grids. The absorption and transportation problems of offshore wind power have always restricted the sustainable development of wind power, resulting in low grid connection efficiency of offshore wind power generation. Summary of the invention

[0004] The present application aims to solve the current problem of low grid-connected efficiency of offshore wind power generation. To this end, the present application provides an offshore wind power energy storage system and a power grid system.

[0005] In a first aspect, the present application provides an offshore wind power energy storage system, comprising:

[0006] Wind turbines, which convert offshore wind energy into electricity;

[0007] An offshore power generation platform, comprising an electrolytic cell stack and a first offshore cathode liquid tank and a first offshore cathode liquid tank respectively connected to the electrolytic cell stack, wherein the electric energy is used to charge the electrolytic cell stack to obtain charged cathode liquid and charged cathode liquid, and the first offshore cathode liquid tank and the first offshore cathode liquid tank are respectively used to store the charged cathode liquid and the charged cathode liquid;

[0008] An onshore power generation platform, comprising a galvanic cell stack and a first onshore cathode liquid tank and a first onshore cathode liquid tank connected to the galvanic cell stack, wherein the galvanic cell stack is used to store the electric energy discharged by the charged cathode liquid and the charged cathode liquid into a power grid and obtain a non-charged cathode liquid and a non-charged cathode liquid, and the first onshore cathode liquid tank and the first onshore cathode liquid tank are used to store the non-charged cathode liquid and the non-charged cathode liquid respectively;

[0009] The shipping equipment includes a sea-land shipping vessel and a land-sea shipping vessel, wherein the sea-land shipping vessel is used to transport the charged positive electrode liquid outputted from the first offshore positive electrode liquid tank and the charged negative electrode liquid outputted from the first offshore negative electrode liquid tank to the onshore power generation platform, and the land-sea shipping vessel is used to transport the uncharged positive electrode liquid outputted from the first onshore positive electrode liquid tank and the uncharged negative electrode liquid outputted from the first onshore negative electrode liquid tank to the offshore power generation platform.

[0010] The offshore wind power energy storage system according to the first aspect of the present application has at least the following beneficial effects:

[0011] The offshore wind power energy storage system of the present application is configured with the coordination of wind turbines, offshore power generation platforms, onshore power generation platforms and shipping equipment. The offshore wind energy is converted into electrical energy through the wind turbines, and the electrical energy is used to charge the offshore electrolytic cell stack, so that the corresponding non-electric positive electrode liquid and non-electric negative electrode liquid are electrolyzed, thereby converting the electrical energy into chemical energy and storing it in the charged positive electrode liquid and the charged negative electrode liquid. The chemical energy stored in the charged positive electrode liquid and the charged negative electrode liquid is transported to the mainland by sea and land shipping ships for the original battery stack on land to generate electricity, and the discharged non-electric positive electrode liquid and non-electric negative electrode liquid are transported to the sea by land and sea shipping ships for the recycling of the offshore electrolytic cell stack. By first converting offshore wind energy into chemical energy that can be stored in electrolyte, and utilizing the transportability and recyclability of electrolyte, the chemical energy of electrolyte can be continuously and stably converted into onshore electricity, matching the high reliability and stability requirements of land power grids, effectively solving the problems of offshore wind power consumption and transportation, and improving the grid-connected efficiency of offshore wind power generation.

[0012] In some embodiments, the offshore power generation platform further comprises a second offshore cathode liquid tank and a second offshore cathode liquid tank connected to the electrolytic cell stack, and the onshore power generation platform further comprises a second onshore cathode liquid tank and a second onshore cathode liquid tank connected to the primary battery stack;

[0013] The sea-land shipping vessel is provided with a first storage tank and a second storage tank, the first storage tank can be connected to the first offshore cathode liquid tank or the second onshore cathode liquid tank through a pipeline, and the second storage tank can be connected to the first offshore cathode liquid tank or the second onshore cathode liquid tank through a pipeline;

[0014] The land and sea shipping vessel is provided with a third storage tank and a fourth storage tank, wherein the third storage tank is used to be connected to the first onshore cathode liquid tank or the second offshore cathode liquid tank via a pipeline, and the fourth storage tank is used to be connected to the first onshore cathode liquid tank or the second offshore cathode liquid tank via a pipeline.

[0015] In some embodiments, the offshore wind power energy storage system also includes a sorting device, which is arranged between the offshore power generation platform and the onshore power generation platform. The sorting device includes a sorting platform and multiple river transport ships. The sorting platform is used to sort the first storage tank and the second storage tank of the sea and land shipping ship to different river transport ships respectively.

[0016] In some embodiments, the first storage tank includes a first tank body, a first structural layer and a first thermal insulation layer, the first structural layer is coated on the outer wall of the first tank body, and the first thermal insulation layer is coated on the outer wall of the first structural layer.

[0017] In some embodiments, the first storage tank, the second storage tank, the third storage tank and the fourth storage tank have the same structure.

[0018] In some embodiments, the electrolytic cell stack includes a first shell, a first positive electrode and a first negative electrode, the interior of the first shell is divided into a first positive cavity and a first negative cavity, and the first positive electrode and the first negative electrode are respectively disposed in the first positive cavity and the first negative cavity;

[0019] The first shell is provided with a first liquid inlet and a first liquid outlet connected to the first positive electrode chamber, and the first shell is also provided with a second liquid inlet and a second liquid outlet connected to the first negative electrode chamber;

[0020] The first liquid inlet and the second liquid inlet are connected to the second offshore positive electrode liquid tank and the second offshore negative electrode liquid tank respectively, and the first outlet and the second liquid outlet are connected to the first offshore positive electrode liquid tank and the first offshore negative electrode liquid tank respectively.

[0021] In some embodiments, the primary battery stack includes a second shell, a second positive electrode and a second negative electrode, the interior of the second shell is divided into a second positive cavity and a second negative cavity, and the second positive electrode and the second negative electrode are respectively disposed in the second positive cavity and the second negative cavity;

[0022] The second shell is provided with a third liquid inlet and a third liquid outlet connected to the second positive electrode cavity, and the second shell is also provided with a fourth liquid inlet and a fourth liquid outlet connected to the second negative electrode cavity;

[0023] The third liquid inlet and the fourth liquid inlet are connected to the second onshore cathode liquid tank and the second onshore cathode liquid tank, respectively, and the third liquid outlet and the fourth liquid outlet are connected to the first onshore cathode liquid tank and the first onshore cathode liquid tank, respectively.

[0024] In some embodiments, the first offshore cathode liquid tank includes a second tank body, a second structural layer, a second insulation layer and an agitator, the second structural layer is coated on the outer wall of the second tank body, the second insulation layer is coated on the outer wall of the second structural layer, and the agitator is arranged in the second tank body.

[0025] In some embodiments, the first onshore cathode liquid tank includes a third tank body, a third structural layer and a third thermal insulation layer, the third structural layer is coated on the outer wall of the third tank body, and the third thermal insulation layer is coated on the outer wall of the third structural layer.

[0026] In a second aspect, the present application provides a power grid system, which includes the offshore wind power energy storage system described above.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Moreover, the same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 This is a schematic diagram of the operating principle of the offshore wind power energy storage system according to an embodiment of the present application.

[0030] Figure 2 This is a schematic diagram of the structure of the shipping equipment according to an embodiment of the present application.

[0031] Figure 3 This is a schematic diagram of the structure of the sorting equipment according to an embodiment of the present application.

[0032] Figure 4 This is a schematic diagram of the structure of a sea-land shipping vessel according to an embodiment of the present application.

[0033] Figure 5 This is a schematic structural diagram of the first storage tank of an embodiment of the present application.

[0034] Figure 6 This is a schematic diagram of the structure of the electrolytic cell stack according to an embodiment of the present application.

[0035] Figure 7 This is a schematic diagram of the structure of the primary battery stack according to an embodiment of the present application.

[0036] Figure 8This is a schematic structural diagram of the first offshore cathode liquid tank according to an embodiment of the present application.

[0037] Fig. 9 This is a schematic structural diagram of the first onshore cathode liquid tank of an embodiment of the present application.

[0038] Description of reference numerals: wind turbine 10; offshore power generation platform 20; electrolytic cell stack 21; first shell 211; first positive electrode 212; first negative electrode 213; first positive cavity 214; first negative cavity 215; first liquid inlet 216; first liquid outlet 217; second liquid inlet 218; second liquid outlet 219; first offshore positive liquid tank 22; second tank 221; second structural layer 222; second insulation layer 223; agitator 224; second liquid level indicator 225; first offshore negative liquid tank 23; second offshore positive liquid tank 24; second offshore negative liquid tank 25; onshore power generation platform 30; primary cell stack 31; second shell 311; second positive electrode 312; second negative electrode 313; second positive cavity 3 14; second negative electrode chamber 315; third liquid inlet 316; third liquid outlet 317; fourth liquid inlet 318; fourth liquid outlet 319; first onshore positive electrode liquid tank 32; third tank body 321; third structural layer 322; third thermal insulation layer 323; third liquid level gauge 324; first onshore negative electrode liquid tank 33; second onshore positive electrode liquid tank 34; second onshore negative electrode liquid tank 35; shipping equipment 40; sea and land shipping vessel 41; first storage tank 411; first tank body 4111; first structural layer 4112; first thermal insulation layer 4113; first liquid level gauge 4114; second storage tank 412; land and sea shipping vessel 42; third storage tank 421; fourth storage tank 422; guide plate 43; sorting equipment 50; sorting platform 51; river ship 52; circulation pump M. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0041] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0044] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0045] In related technologies, offshore wind turbines are generally used in conjunction with lithium battery energy storage systems or hydrogen energy storage systems to obtain electricity and transport the electricity to land for grid connection. However, offshore wind turbines are far from shore and offshore wind energy has obvious intermittent and volatile characteristics, making it difficult to match the high reliability and stability requirements of land power grids. The absorption and transportation problems of offshore wind power have always restricted the sustainable development of wind power, resulting in low grid connection efficiency of offshore wind power generation.

[0046] Based on this, the embodiment of the present application provides an offshore wind power energy storage system, which converts offshore wind energy into electrical energy through the coordinated arrangement of wind turbines, offshore power generation platforms, onshore power generation platforms and shipping equipment, and uses the electrical energy to charge the offshore electrolytic cell stack, so that the corresponding non-electrolyte positive electrode liquid and non-electrolyte negative electrode liquid are electrolyzed, thereby converting the electrical energy into chemical energy and storing it in the charged positive electrode liquid and the charged negative electrode liquid. The chemical energy stored in the charged positive electrode liquid and the charged negative electrode liquid is transported to the mainland by sea and land shipping ships for the original battery stack on land to generate electricity, and the discharged non-electrolyte positive electrode liquid and non-electrolyte negative electrode liquid are transported to the sea by land and sea shipping ships for the recycling of the offshore electrolytic cell stack. By first converting offshore wind energy into chemical energy that can be stored in electrolyte, and utilizing the transportability and recyclability of electrolyte, the chemical energy of electrolyte can be continuously and stably converted into onshore electricity, matching the high reliability and stability requirements of land power grids, effectively solving the problems of offshore wind power consumption and transportation, and improving the grid-connected efficiency of offshore wind power generation.

[0047] See also Figure 1 and Figure 2 An embodiment of the present application provides an offshore wind power energy storage system, which includes a wind turbine 10, an offshore power generation platform 20, an onshore power generation platform 30 and a shipping equipment 40.

[0048] The wind turbine 10 is used to convert offshore wind energy into electrical energy. The offshore power generation platform 20 includes an electrolytic cell stack 21 and a first offshore positive electrode liquid tank 22 and a first offshore negative electrode liquid tank 23 respectively connected to the electrolytic cell stack 21. The electrical energy is used to charge the electrolytic cell stack 21 to obtain charged positive electrode liquid and charged negative electrode liquid. The first offshore positive electrode liquid tank 22 and the first offshore negative electrode liquid tank 23 are respectively used to store charged positive electrode liquid and charged negative electrode liquid.

[0049] The onshore power generation platform 30 includes a primary battery stack 31 and a first onshore positive electrode liquid tank 32 and a first onshore negative electrode liquid tank 33 connected to the primary battery stack 31. The primary battery stack 31 is used to store the electric energy discharged by the charged positive electrode liquid and the charged negative electrode liquid to the power grid, and obtain the non-charged positive electrode liquid and the non-charged negative electrode liquid. The first onshore positive electrode liquid tank 32 and the first onshore negative electrode liquid tank 33 are used to store the non-charged positive electrode liquid and the non-charged negative electrode liquid, respectively.

[0050] The shipping equipment 40 includes a sea-land shipping vessel 41 and a land-sea shipping vessel 42. The sea-land shipping vessel 41 is used to transport the charged positive electrode liquid output from the first offshore positive electrode liquid tank 22 and the charged negative electrode liquid output from the first offshore negative electrode liquid tank 23 to the onshore power generation platform 30. The land-sea shipping vessel 42 is used to transport the uncharged positive electrode liquid output from the first onshore positive electrode liquid tank 32 and the uncharged negative electrode liquid output from the first onshore negative electrode liquid tank 33 to the offshore power generation platform 20.

[0051] It should be noted that in the present application, the wind turbine 10 generates electricity by driving a generator through offshore wind energy, and the electricity obtained by the wind turbine 10 is used to charge the electrolytic cell stack 21 on the offshore power generation platform 20 .

[0052] In the present application, the electrolytic cell stack 21 of the offshore power generation platform 20 and the primary battery stack 31 of the onshore power generation platform 30 both use all-vanadium redox flow batteries. Through the charging and discharging of the all-vanadium redox flow batteries, based on the redox reaction between vanadium ions at different valence levels, and through the circulation of the electrolyte, the mutual conversion of electrical energy and chemical energy is achieved.

[0053] The charging of the electrolytic cell stack 21 of the offshore power generation platform 20 based on the all-vanadium redox flow battery is used as an example for explanation:

[0054] The electrolytic cell stack 21 has a positive electrode electrolyte chamber and a negative electrode electrolyte chamber separated by an ion conductive membrane. The positive electrode electrolyte chamber and the negative electrode electrolyte chamber have flowing positive electrode electrolyte (hereinafter referred to as positive electrode solution) and negative electrode electrolyte (hereinafter referred to as negative electrode solution), respectively. The positive electrode solution contains VO + 2 and VO 2+ , the negative electrode solution contains V 3+ and V 2+ The ion conducting membrane only allows protons to pass through, preventing the positive and negative liquids from mixing. The positive and negative liquid chambers are provided with positive electrodes and negative electrodes respectively, and the positive and negative electrodes are used to provide reaction sites. The above-mentioned ion conducting membrane can be a non-fluorine porous ion conducting membrane, which has low cost and has the advantages of high conductivity, high ion exchange rate, strong corrosion resistance, etc.

[0055] When the electric energy charges the electrolytic cell stack 21, the positive electrode reaction is: VO2+ +H 2 O→VO + 2 +2H + +e - ; The negative electrode reaction is: V 3+ +e - →V 2+ ; The overall reaction is: VO 2+ +V 3+ +H 2 O→VO + 2 +2H + +V 2+ It should be understood that the electric energy charges the electrolytic cell stack 21, and the non-charged positive electrode liquid in the electrolytic cell stack 21 becomes a charged positive electrode liquid, and the non-charged negative electrode liquid becomes a charged negative electrode liquid, that is, the electric energy is converted into the chemical energy of the electrolyte and stored.

[0056] Similarly, the discharge process of the primary battery stack 31 on the land power generation platform 30 based on the all-vanadium redox flow battery is opposite to the charging process of the electrolytic cell stack 21 on the offshore power generation platform 20, and the specific reaction is not repeated. The charged positive electrode liquid and the charged negative electrode liquid of the primary battery stack 31 are discharged to become non-charged positive electrode liquid and non-charged negative electrode liquid, that is, the chemical energy of the electrolyte is converted into electrical energy. The electrical energy generated by the discharge of the primary battery stack 31 is transformed by a transformer and rectified by a rectifier and then incorporated into the power grid, and the power grid provides electrical energy to the user end, so that the offshore wind energy is converted into electrical energy for the users under the power grid.

[0057] Based on the above description of the operating principle of the electrolytic cell stack 21 of the offshore power generation platform 20 and the primary battery stack 31 on the onshore power generation platform 30, the operating principle of the offshore wind power storage system of the embodiment of the present application is further described:

[0058] The wind turbine 10 converts offshore wind energy into electrical energy. The wind turbine 10 is electrically connected to the electrolytic cell stack 21 of the offshore power generation platform 20. The electrical energy charges the electrolytic cell stack 21 of the offshore power generation platform 20, so that the non-charged positive electrode liquid and the non-charged negative electrode in the electrolytic cell stack 21 are converted into charged positive electrode liquid and charged negative electrode liquid respectively. The charged positive electrode liquid and the charged negative electrode liquid obtained after the electrolytic cell stack 21 is charged are respectively transported to the first offshore positive electrode liquid tank 22 and the first offshore negative electrode liquid tank 23 of the offshore power generation platform 20 through pipelines for storage. The sea and land shipping ship 41 of the shipping equipment 40 respectively draws out and stores the charged positive electrode liquid in the first offshore positive electrode liquid tank 22 and the charged negative electrode liquid in the first offshore negative electrode liquid tank 23, and then transports the charged positive electrode liquid and the non-charged positive electrode liquid to the onshore power generation platform 30 by sea transportation, so that the onshore power generation platform 30 supplies the charged positive electrode liquid and the non-charged positive electrode liquid to the primary battery stack 31. The charged positive electrode liquid and the charged positive electrode liquid are discharged in the original battery stack 31, and the obtained non-charged positive electrode liquid and non-charged negative electrode liquid are respectively transported to the first onshore positive electrode liquid tank 32 and the first onshore negative electrode liquid tank 33 of the onshore power generation platform 30 through pipelines for storage, and the obtained electric energy is incorporated into the power grid for use by land users. The land and sea shipping ship 42 of the shipping equipment 40 respectively draws out and stores the non-charged positive electrode liquid in the first onshore positive electrode liquid tank 32 and the non-charged negative electrode liquid in the first onshore negative electrode liquid tank 33, and then transports the non-charged positive electrode liquid and the non-charged negative electrode liquid to the offshore power generation platform 20 by sea transportation, so that the offshore power generation platform 20 supplies the non-charged positive electrode liquid and the non-charged negative electrode liquid to the electrolytic cell stack 21. In this cycle, the offshore wind energy is efficiently converted into onshore electric energy and incorporated into the power grid for users.

[0059] Through the above description, it is not difficult to understand that the offshore wind power energy storage system of the embodiment of the present application is configured by the coordination of the wind turbine 10, the offshore power generation platform 20, the onshore power generation platform 30 and the shipping equipment 40. The offshore wind energy is converted into electrical energy through the wind turbine 10, and the electrical energy is used to charge the offshore electrolytic cell stack 21, so that the corresponding non-electrolyte positive electrode liquid and non-electrolyte negative electrode liquid are electrolyzed, thereby converting the electrical energy into chemical energy and storing it in the charged positive electrode liquid and the charged negative electrode liquid. The chemical energy stored in the charged positive electrode liquid and the charged negative electrode liquid is transported to the mainland by the sea-land shipping ship 41 for the onshore primary battery stack 31 to generate electricity, and the discharged non-electrolyte positive electrode liquid and non-electrolyte negative electrode liquid are transported to the sea by the land-sea shipping ship 42 for the recycling of the offshore electrolytic cell stack 21. By first converting offshore wind energy into chemical energy that can be stored in electrolyte, and utilizing the transportability and recyclability of electrolyte, the chemical energy of electrolyte can be continuously and stably converted into onshore electricity, matching the high reliability and stability requirements of land power grids, effectively solving the problems of offshore wind power consumption and transportation, and improving the grid-connected efficiency of offshore wind power generation.

[0060] In some embodiments of the present application, see Figure 1 and Figure 2 The offshore power generation platform 20 also includes a second offshore cathode liquid tank 24 and a second offshore cathode liquid tank 25 connected to the electrolytic cell stack 21, and the onshore power generation platform 30 also includes a second onshore cathode liquid tank 34 and a second onshore cathode liquid tank 35 connected to the primary battery stack 31.

[0061] The sea and land shipping vessel 41 is provided with a first storage tank 411 and a second storage tank 412 . The first storage tank 411 can be connected to the first offshore cathode liquid tank 22 or the second onshore cathode liquid tank 34 through a pipeline, and the second storage tank 412 can be connected to the first offshore cathode liquid tank 23 or the second onshore cathode liquid tank 35 through a pipeline.

[0062] The land and sea shipping vessel 42 is provided with a third storage tank 421 and a fourth storage tank 422. The third storage tank 421 is used to connect to the first onshore cathode liquid tank 32 or the second offshore cathode liquid tank 24 through a pipeline, and the fourth storage tank 422 is used to connect to the first onshore cathode liquid tank 33 or the second offshore cathode liquid tank 25 through a pipeline.

[0063] It should be noted that on the offshore power generation platform 20, the positions of the first offshore positive electrode liquid tank 22, the first offshore negative electrode liquid tank 23, the second offshore positive electrode liquid tank 24 and the second offshore negative electrode liquid tank 25 relative to the electrolytic cell stack 21 are relatively fixed, the second offshore positive electrode liquid tank 24 and the first offshore positive electrode liquid tank 22 are respectively connected to the positive electrode liquid inlet and the positive electrode liquid outlet of the electrolytic cell stack 21 through pipelines, and the second offshore negative electrode liquid tank 25 and the first offshore negative electrode liquid tank 23 are respectively connected to the negative electrode liquid inlet and the negative electrode liquid outlet of the electrolytic cell stack 21 through pipelines.

[0064] It is easy to understand that the second offshore positive electrode liquid tank 24 and the second offshore negative electrode liquid tank 25 respectively supply uncharged positive electrode liquid and uncharged negative electrode liquid to the electrolytic cell stack 21, and the first offshore positive electrode liquid tank 22 and the first offshore negative electrode liquid tank 23 respectively store charged positive electrode liquid and charged negative electrode liquid formed after the electrolytic cell stack 21 is charged.

[0065] Similarly, on the onshore power generation platform 30, the positions of the first onshore positive electrode liquid tank 32, the first onshore negative electrode liquid tank 33, the second onshore positive electrode liquid tank 34 and the second onshore negative electrode liquid tank 35 relative to the original battery stack 31 are relatively fixed, the second onshore positive electrode liquid tank 34 and the first onshore positive electrode liquid tank 32 are respectively connected to the positive electrode liquid inlet and the positive electrode liquid outlet of the original battery stack 31 through pipelines, and the second onshore negative electrode liquid tank 35 and the first onshore negative electrode liquid tank 33 are respectively connected to the negative electrode liquid inlet and the negative electrode liquid outlet of the original battery stack 31 through pipelines.

[0066] It is easy to understand that the second onshore positive electrode liquid tank 34 and the second onshore negative electrode liquid tank 35 respectively supply charged positive electrode liquid and charged negative electrode liquid to the original battery stack 31, and the first onshore positive electrode liquid tank 32 and the first onshore negative electrode liquid tank 33 respectively store the uncharged positive electrode liquid and uncharged negative electrode liquid formed after the original battery stack 31 is discharged.

[0067] When the sea-land shipping ship 41 transports the charged positive electrode liquid and the charged negative electrode liquid to the onshore power generation platform 30, the sea-land shipping ship 41 docks at the offshore power generation platform 20, and connects the first storage tank 411 on the sea-land shipping ship 41 with the first offshore positive electrode liquid tank 22 of the offshore power generation platform 20 through a pipeline, and connects the second storage tank 412 on the sea-land shipping ship 41 with the first offshore negative electrode liquid tank 23 of the offshore power generation platform 20, so that the charged positive electrode liquid in the first offshore positive electrode liquid tank 22 is transported to the first storage tank 411 through the pipeline, and the uncharged negative electrode liquid in the first offshore negative electrode liquid tank 23 is transported to the second storage tank 412 through the pipeline. The first storage tank 411 and the second storage tank 412 are then transported to the onshore power generation platform 30 by the sea-land shipping ship 41, and the first storage tank 411 on the sea-land shipping ship 41 is connected to the second onshore positive electrode liquid tank 34 of the onshore power generation platform 30 by a pipeline, and the second storage tank 412 is connected to the second onshore negative electrode liquid tank 35 of the onshore power generation platform 30, so that the charged positive electrode liquid in the first storage tank 411 is transported to the second onshore positive electrode liquid tank 34 through the pipeline, and the charged negative electrode liquid in the second storage tank 412 is transported to the second onshore negative electrode liquid tank 35 through the pipeline, so as to supply the charged positive electrode liquid and the charged negative electrode liquid to the original battery stack 31.

[0068] The process of the land and sea shipping vessel 42 transporting the electroless cathode liquid and the electroless cathode liquid to the offshore power generation platform 20 is similar and will not be described in detail here.

[0069] It should be understood that by arranging the first storage tank 411 and the second storage tank 412 on the sea-land shipping ship 41, and arranging the third storage tank 421 and the fourth storage tank 422 on the land-sea shipping ship 42, during the reciprocating shipping of the sea-land shipping ship 41 and the land-sea shipping ship 42 on sea and land, the first storage tank 411 is used to store and transfer the positive electrode liquid with charge, the second storage tank 412 is used to store and transfer the negative electrode liquid with charge, the third storage tank 421 is used to store and transfer the positive electrode liquid without charge, and the fourth storage tank 422 is used to store and transfer the negative electrode liquid without charge. There is no need to transport and transfer the liquid tanks storing the electrolyte of the offshore power generation platform 20 and the onshore power generation platform 30. The corresponding electrolyte can be circulated and used repeatedly at sea and on shore only through the disassembly and assembly of the pipeline and the transportation of the shipping ship, which simplifies the electrolyte transfer process and improves the transportation efficiency of the electrolyte between sea and land, thereby correspondingly improving the wind power grid connection efficiency.

[0070] Further, see Figure 1 and Figure 3At least two sea-land shipping vessels 41 and at least two land-sea shipping vessels 42 can be set up to transport electrolyte back and forth between sea and land continuously and uninterruptedly, thereby improving the continuity of the overall operation of the energy storage system, further matching the requirements of high reliability and stability of the land power grid, and improving the grid connection efficiency of offshore wind power generation.

[0071] In some embodiments of the present application, see Figure 1 and Figure 3 The offshore wind power energy storage system also includes a sorting device 50, which is arranged between the offshore power generation platform 20 and the onshore power generation platform 30. The sorting device 50 includes a sorting table 51 and multiple river transport ships 52. The sorting table 51 is used to sort the first storage tank 411 and the second storage tank 412 of the sea and land shipping ship 41 to different river transport ships 52.

[0072] Specifically, the sorting device 50 can be arranged near the onshore power generation platform 30, such as the sorting device 50 is arranged at a port. The sorting platform 51 can be a matching structure of a visual sorting system and a mechanical handling mechanism. The river transport ship 52 includes a first river ship and a second river ship, the first river ship is used to carry and transfer the first storage tank 411, and the second river ship is used to carry and transfer the second storage tank 412.

[0073] Through the coordinated arrangement of the sorting platform 51 of the sorting equipment 50 and a plurality of river vessels 52, the number of the first storage tank 411 or the second storage tank 412 on the corresponding river vessel 52 can be flexibly adjusted according to the scale and electricity demand of different land power generation platforms 30, so as to dispatch the amount of charged positive electrode liquid or the amount of charged negative electrode liquid to adaptively meet the electricity demand of land power generation platforms 30 of different scales.

[0074] In some embodiments of the present application, see Figure 5 The first storage tank 411 includes a first tank body 4111, a first structural layer 4112 and a first thermal insulation layer 4113. The first structural layer 4112 is coated on the outer wall of the first tank body 4111, and the first thermal insulation layer 4113 is coated on the outer wall of the first structural layer 4112.

[0075] Specifically, the first storage tank 411 can be stainless steel or an electrolyte container with a special coating, the first structural layer 4112 is set to be fiberglass with a shape roughly the same as the electrolyte container, the thickness of the fiberglass is 16mm, and the first insulation layer 4113 is polyurethane foam, glass wool, etc. with a thickness of 0.3m.

[0076] It is not difficult to understand that the first tank body 4111 provides a space for accommodating and storing the positive electrode liquid, the first structural layer 4112 improves the mechanical strength and impact resistance of the first tank body 4111, and prevents the positive electrode liquid from being corroded, and the first thermal insulation layer 4113 maintains the temperature stability of the positive electrode liquid, and protects the first storage tank 4111 and the first structural layer 4112 from mechanical damage.

[0077] In addition, a first liquid level meter 4114 may be provided in the first tank body 4111 , and the first liquid level meter 4114 is used to detect the liquid level of the charged cathode liquid for monitoring and observation by the staff.

[0078] Furthermore, the first storage tank 411, the second storage tank 412, the third storage tank 421 and the fourth storage tank 422 have the same structure, that is, all of them are box structures in which the tank body, the structural layer and the insulation layer are nested in sequence, which will not be described in detail here.

[0079] In addition, see Figure 4 Both the sea-land shipping ship 41 and the land-sea shipping ship 42 are provided with guide plates 43, which are arranged at the bow, stern, side, etc. of the sea-land shipping ship 41 and the land-sea shipping ship 42, and the guide plates 43 are inclined 5° to 10° relative to the storage tanks on the sea-land shipping ship 41 or the land-sea shipping ship 42.

[0080] The guide plate 43 guides the sea airflow, reduces the direct impact of the airflow on the storage tanks on the sea-land shipping ship 41 or the land-sea shipping ship 42, reduces the turbulence of the storage tanks, makes the electrolyte in the storage tanks evenly distributed, and increases the shipping safety.

[0081] In some embodiments of the present application, see Figure 6 The electrolytic cell stack 21 includes a first shell 211, a first positive electrode 212 and a first negative electrode 213. The interior of the first shell 211 is divided into a first positive cavity 214 and a first negative cavity 215. The first positive electrode 212 and the first negative electrode 213 are respectively arranged in the first positive cavity 214 and the first negative cavity 215; the first shell 211 is provided with a first liquid inlet 216 and a first liquid outlet 217 connected to the first positive cavity 214, and the first shell 211 is also provided with a second liquid inlet 218 and a second liquid outlet 219 connected to the first negative cavity 215; the first liquid inlet 216 and the second liquid inlet 218 are respectively connected to the second offshore positive electrode liquid tank 24 and the second offshore negative electrode liquid tank 25, and the first liquid outlet 217 and the second liquid outlet 219 are respectively connected to the first offshore positive electrode liquid tank 22 and the first offshore negative electrode liquid tank 23.

[0082] Specifically, the first positive electrode 212 and the first negative electrode 213 are both made of carbon electrodes, such as carbon felt, graphite felt, carbon cloth, etc., so that the first positive electrode 212 and the first negative electrode 213 have high conductivity, corrosion resistance and stable chemical properties.

[0083] It can be understood that the first liquid inlet 216 and the second liquid inlet 218 on the first shell 211 correspond to the positive electrode liquid inlet and the negative electrode liquid inlet of the electrolytic cell stack 21, and the first liquid outlet 217 and the second liquid outlet 219 correspond to the positive electrode liquid outlet and the negative electrode liquid inlet of the electrolytic cell stack 21.

[0084] Through the above arrangement, based on the relatively fixed positions of the first offshore positive electrode liquid tank 22, the first offshore negative electrode liquid tank 23, the second offshore positive electrode liquid tank 24 and the second offshore negative electrode liquid tank 25 relative to the electrolytic cell stack 21, it is beneficial to simplify the pipeline structure layout of the first offshore positive electrode liquid tank 22, the first offshore negative electrode liquid tank 23, the second offshore positive electrode liquid tank 24 and the second offshore negative electrode liquid tank 25 and the electrolytic cell stack 21, so that the electrolyte can flow accurately.

[0085] Similarly, in some embodiments of the present application, see Figure 7 The original battery stack 31 includes a second shell 311, a second positive electrode 312 and a second negative electrode 313. The interior of the second shell 311 is divided into a second positive electrode chamber 314 and a second negative electrode chamber 315. The second positive electrode 312 and the second negative electrode 313 are respectively arranged in the second positive electrode chamber 314 and the second negative electrode chamber 315; the second shell 311 is provided with a third liquid inlet 316 and a third liquid outlet 317 connected to the second positive electrode chamber 314, and the second shell 311 is also provided with a fourth liquid inlet 318 and a fourth liquid outlet 319 connected to the second negative electrode chamber 315; the third liquid inlet 316 and the fourth liquid inlet 318 are respectively connected to the second onshore positive electrode liquid tank 34 and the second onshore negative electrode liquid tank 35, and the third liquid outlet 317 and the fourth liquid outlet 319 are respectively connected to the first onshore positive electrode liquid tank 32 and the first onshore negative electrode liquid tank 33.

[0086] Specifically, the second positive electrode 312 and the second negative electrode 313 are both made of carbon electrodes, such as carbon felt, graphite felt, carbon cloth, etc., so that the second positive electrode 312 and the second negative electrode 313 have high conductivity, corrosion resistance and stable chemical properties.

[0087] It can be understood that the third liquid inlet 316 and the fourth liquid inlet 318 on the second shell 311 correspond to the positive liquid inlet and the negative liquid inlet of the original battery stack 31, and the third liquid outlet 317 and the fourth liquid outlet 319 correspond to the positive liquid outlet and the negative liquid inlet of the original battery stack 31.

[0088] Through the above arrangement, based on the relatively fixed positions of the first onshore positive electrode liquid tank 32, the first onshore negative electrode liquid tank 33, the second onshore positive electrode liquid tank 34 and the second onshore negative electrode liquid tank 35 relative to the original battery stack 31, it is beneficial to simplify the pipeline structure layout of the first onshore positive electrode liquid tank 32, the first onshore negative electrode liquid tank 33, the second onshore positive electrode liquid tank 34 and the second onshore negative electrode liquid tank 35 and the original battery stack 31, so that the electrolyte can flow accurately.

[0089] In addition, it should be noted that in the embodiment of the present application, the transmission of the electrolyte is achieved by the circulation pump M in conjunction with the pipeline transmission. A battery management system (BMS system) is provided in the electrolytic cell stack 21, and the battery management system is used to control the start and stop of the circulation pump, monitor the operating status of the electrolytic cell stack 21, detect and diagnose the operating faults of the electrolytic cell stack 21, collect operating parameters, etc., so that the electrolytic cell stack 21 has multiple operating modes and is better adapted to the offshore wind turbines 10 in various load states.

[0090] In some embodiments of the present application, see Figure 8 The first offshore cathode liquid tank 22 includes a second tank body 221, a second structural layer 222, a second thermal insulation layer 223 and an agitator 224. The second structural layer 222 is coated on the outer wall of the second tank body 221, the second thermal insulation layer 223 is coated on the outer wall of the second structural layer 222, and the agitator 224 is arranged in the second tank body 221.

[0091] Specifically, the second tank body 221 can be stainless steel or an electrolyte container with a special coating, the second structural layer 222 is set to be glass fiber reinforced plastic with a shape roughly the same as that of the electrolyte container, the thickness of the glass fiber reinforced plastic is 16 mm, and the second insulation layer 223 is polyurethane foam, glass wool, etc. with a thickness of 0.3 m. The stirrer 224 is used to stir the electrolyte in the second tank body 221 to make the electrolyte evenly distributed.

[0092] It is not difficult to understand that the second tank body 221 provides a space for accommodating and storing the positive electrode liquid, the second structural layer 222 improves the mechanical strength and impact resistance of the second tank body 221, and prevents the positive electrode liquid from being corroded, and the second thermal insulation layer 223 maintains the temperature stability of the positive electrode liquid, and protects the second tank body 221 and the second structural layer 222 from mechanical damage.

[0093] In addition, a second liquid level gauge 225 may be provided in the second tank body 221 , and the second liquid level gauge 225 is used to detect the liquid level of the charged cathode liquid for monitoring and observation by the staff.

[0094] The first offshore cathode liquid tank 23 , the second offshore cathode liquid tank 24 and the second offshore cathode liquid tank 25 have the same structure as the first offshore cathode liquid tank 22 , and will not be described in detail herein.

[0095] In some embodiments of the present application, see Fig. 9 The first onshore cathode liquid tank 32 includes a third tank body 321 , a third structural layer 322 and a third thermal insulation layer 323 . The third structural layer 322 is coated on the outer wall of the third tank body 321 , and the third thermal insulation layer 323 is coated on the outer wall of the third structural layer 322 .

[0096] Specifically, the third tank body 321 can be stainless steel or an electrolyte container with a special coating, the third structural layer 322 is set to be fiberglass with a shape roughly the same as the electrolyte container, the thickness of the fiberglass is 16mm, and the third insulation layer 323 is polyurethane foam, glass wool, etc. with a thickness of 0.3m.

[0097] It is not difficult to understand that the third tank body 321 provides a space for accommodating and storing the non-electrolyte positive electrode liquid, the third structural layer 322 improves the mechanical strength and impact resistance of the third tank body 321, and prevents the charged positive electrode liquid from being corroded, and the third thermal insulation layer 323 maintains the temperature stability of the non-electrolyte positive electrode liquid, and protects the third tank body 321 and the third structural layer 322 from mechanical damage.

[0098] In addition, a third liquid level gauge 324 may be provided in the second tank body 221 . The third liquid level gauge 324 is used to detect the liquid level of the electroless cathode liquid for monitoring and observation by the staff.

[0099] The first onshore cathode liquid tank 33 , the second onshore cathode liquid tank 34 and the second onshore cathode liquid tank 35 all have the same structure as the first onshore cathode liquid tank 32 , and are not described in detail herein.

[0100] In addition, an embodiment of the present application further provides a power grid system, which includes the offshore wind power energy storage system of any of the above embodiments.

[0101] The power grid system of the embodiment of the present application, since it is equipped with the above-mentioned offshore wind power energy storage system, also has the same technical effect brought by the offshore wind power energy storage system, that is, by first converting the offshore wind energy into chemical energy that can be stored in the electrolyte, and utilizing the transportability and recyclability of the electrolyte, the chemical energy of the electrolyte can be continuously and stably converted into onshore electrical energy, matching the requirements of high reliability and stability of the land power grid, effectively solving the problems of offshore wind power consumption and transportation, and improving the grid-connected efficiency of offshore wind power generation.

[0102] 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.

[0103] 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 construed as limiting the scope of the patent 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 patent application shall be subject to the attached claims.

Claims

1. An offshore wind power energy storage system, characterized in that: include: Wind turbines, which are used to convert offshore wind energy into electricity; An offshore power generation platform, comprising an electrolytic cell stack and a first offshore cathode liquid tank and a first offshore cathode liquid tank respectively connected to the electrolytic cell stack, wherein the electric energy is used to charge the electrolytic cell stack to obtain charged cathode liquid and charged cathode liquid, and the first offshore cathode liquid tank and the first offshore cathode liquid tank are respectively used to store the charged cathode liquid and the charged cathode liquid; An onshore power generation platform, comprising a galvanic cell stack and a first onshore cathode liquid tank and a first onshore cathode liquid tank connected to the galvanic cell stack, wherein the galvanic cell stack is used to store the electric energy discharged by the charged cathode liquid and the charged cathode liquid into a power grid and obtain a non-charged cathode liquid and a non-charged cathode liquid, and the first onshore cathode liquid tank and the first onshore cathode liquid tank are used to store the non-charged cathode liquid and the non-charged cathode liquid respectively; The shipping equipment includes a sea-land shipping vessel and a land-sea shipping vessel, wherein the sea-land shipping vessel is used to transport the charged positive electrode liquid outputted from the first offshore positive electrode liquid tank and the charged negative electrode liquid outputted from the first offshore negative electrode liquid tank to the onshore power generation platform, and the land-sea shipping vessel is used to transport the uncharged positive electrode liquid outputted from the first onshore positive electrode liquid tank and the uncharged negative electrode liquid outputted from the first onshore negative electrode liquid tank to the offshore power generation platform.

2. The offshore wind power energy storage system according to claim 1, characterized in that: The offshore power generation platform further comprises a second offshore cathode liquid tank and a second offshore cathode liquid tank connected to the electrolytic cell stack, and the onshore power generation platform further comprises a second onshore cathode liquid tank and a second onshore cathode liquid tank connected to the primary battery stack; The sea-land shipping vessel is provided with a first storage tank and a second storage tank, the first storage tank can be connected to the first offshore cathode liquid tank or the second onshore cathode liquid tank through a pipeline, and the second storage tank can be connected to the first offshore cathode liquid tank or the second onshore cathode liquid tank through a pipeline; The land and sea shipping vessel is provided with a third storage tank and a fourth storage tank, wherein the third storage tank is used to be connected to the first onshore cathode liquid tank or the second offshore cathode liquid tank via a pipeline, and the fourth storage tank is used to be connected to the first onshore cathode liquid tank or the second offshore cathode liquid tank via a pipeline.

3. The offshore wind power energy storage system according to claim 2, characterized in that: The offshore wind power energy storage system also includes a sorting device, which is arranged between the offshore power generation platform and the onshore power generation platform. The sorting device includes a sorting table and multiple river transport ships. The sorting table is used to sort the first storage tank and the second storage tank of the sea and land shipping ship to different river transport ships respectively.

4. The offshore wind power energy storage system according to claim 2, characterized in that: The first storage tank includes a first tank body, a first structural layer and a first thermal insulation layer. The first structural layer is coated on the outer wall of the first tank body, and the first thermal insulation layer is coated on the outer wall of the first structural layer.

5. The offshore wind power energy storage system according to claim 4, characterized in that: The first storage tank, the second storage tank, the third storage tank and the fourth storage tank have the same structure.

6. The offshore wind power energy storage system according to claim 2, characterized in that: The electrolytic cell stack comprises a first shell, a first positive electrode and a first negative electrode, the interior of the first shell is divided into a first positive cavity and a first negative cavity, the first positive electrode and the first negative electrode are respectively arranged in the first positive cavity and the first negative cavity; The first shell is provided with a first liquid inlet and a first liquid outlet connected to the first positive electrode chamber, and the first shell is also provided with a second liquid inlet and a second liquid outlet connected to the first negative electrode chamber; The first liquid inlet and the second liquid inlet are connected to the second offshore positive electrode liquid tank and the second offshore negative electrode liquid tank respectively, and the first outlet and the second liquid outlet are connected to the first offshore positive electrode liquid tank and the first offshore negative electrode liquid tank respectively.

7. The offshore wind power energy storage system according to claim 2, characterized in that: The primary battery stack comprises a second shell, a second positive electrode and a second negative electrode, the interior of the second shell is divided into a second positive cavity and a second negative cavity, and the second positive electrode and the second negative electrode are respectively arranged in the second positive cavity and the second negative cavity; The second shell is provided with a third liquid inlet and a third liquid outlet connected to the second positive electrode cavity, and the second shell is also provided with a fourth liquid inlet and a fourth liquid outlet connected to the second negative electrode cavity; The third liquid inlet and the fourth liquid inlet are connected to the second onshore cathode liquid tank and the second onshore cathode liquid tank, respectively, and the third liquid outlet and the fourth liquid outlet are connected to the first onshore cathode liquid tank and the first onshore cathode liquid tank, respectively.

8. The offshore wind power energy storage system according to claim 1, characterized in that: The first offshore cathode liquid tank includes a second tank body, a second structural layer, a second insulation layer and an agitator. The second structural layer is coated on the outer wall of the second tank body, the second insulation layer is coated on the outer wall of the second structural layer, and the agitator is arranged in the second tank body.

9. The offshore wind power energy storage system according to claim 1, characterized in that: The first onshore cathode liquid tank comprises a third tank body, a third structural layer and a third thermal insulation layer. The third structural layer is coated on the outer wall of the third tank body, and the third thermal insulation layer is coated on the outer wall of the third structural layer.

10. A power grid system, characterized in that: The power grid system comprises the offshore energy storage system according to any one of claims 1 to 9.

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