Full-modular all-vanadium redox flow battery box and all-vanadium redox flow battery system

Abstract

The utility model provides a full-modular all-vanadium redox flow battery box and an all-vanadium redox flow battery system, the full-modular all-vanadium redox flow battery box comprises a box body, a module area and an electric control area, the module area and the electric control area are arranged in the box body, an all-vanadium redox flow battery module is arranged in the module area, and a cabinet is arranged in the electric control area; the all-vanadium redox flow battery module comprises an electrolyte container, a carrier and an electric pile, the carrier is arranged on the electrolyte container, and the electric pile is arranged on the carrier. By arranging the box body and arranging the module area and the electric control area in the box body according to functions, the modularized manufacturing of the all-vanadium redox flow battery box is realized, so that the design layout of the all-vanadium redox flow battery box is more regular, and a large number of parts in the all-vanadium redox flow battery box can be directly preassembled during factory production; the production of the all-vanadium redox flow battery box is more time-saving and efficient, large-scale production is facilitated, and the production cost is lower.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and specifically relates to a fully modular all-vanadium liquid flow battery box and an all-vanadium liquid flow battery system. Background Art

[0002] All-vanadium liquid flow batteries use vanadium electrolytes of different valence states to circulate through the positive and negative electrodes to carry out electrochemical reactions, thereby achieving the mutual conversion of electrical energy and chemical energy.

[0003] All-vanadium liquid flow batteries are usually composed of power units (stacks), capacity units (vanadium electrolyte and storage tanks), vanadium electrolyte transport units (pipelines, valves, circulation pumps, heat exchangers, etc.). All-vanadium liquid flow battery stacks usually use end plates to fasten the inlet and outlet plates, current collecting plates and multiple single cells. Single cells are usually composed of positive and negative electrode frames, positive and negative electrodes, proton membranes, bipolar plates, and seals. The positive and negative electrodes of a single cell are respectively installed in the positive and negative electrode frames, and the proton membranes are used to separate and conduct hydrogen ions; the positive and negative electrodes of a single cell are separated from the negative electrode of the previous single cell and the positive electrode of the next single cell by bipolar plates to conduct electrons.

[0004] Under the action of the positive and negative vanadium electrolyte circulation pumps, the positive and negative vanadium electrolytes in the positive and negative vanadium electrolyte storage tanks flow into the battery stack through the positive and negative electrode inlet main flow channels at the bottom of the battery stack, and evenly flow through the positive and negative electrode microporous flow channels of each single cell from bottom to top after being evenly divided through the inlet branch flow channels at the bottom of the positive and negative electrode frames of each single cell to perform electrode reactions. After the reaction, the positive and negative vanadium electrolytes evenly converge through the outlet branch flow channels at the top of the positive and negative electrode frames of each single cell, and then flow out of the battery stack through the positive and negative electrode outlet main flow channels at the top of the battery stack, and flow back to the positive and negative vanadium electrolyte storage tanks respectively. After so many cycles, the positive and negative vanadium electrolytes flow through the positive and negative electrodes of each single cell of the battery stack to perform electrode reactions, thereby completing the charging and discharging of the all-vanadium liquid flow battery.

[0005] At present, the all-vanadium liquid flow battery energy storage system mixes multiple battery stacks in a container and shares the vanadium electrolyte in an external storage tank. This not only requires the installation of vanadium electrolyte storage tanks and pipelines at the project site, but is also time-consuming, inefficient and costly.

[0006] In addition, there are multiple battery stacks connected in series and sharing the same vanadium electrolyte. The number of single cells in series N increases many times, and the branch self-discharge current is roughly proportional to N (N-1), which leads to a significant decrease in the energy efficiency of the battery stack and the system. Utility Model Content

[0007] Therefore, the technical problem to be solved by the present application is to provide a fully modular all-vanadium liquid flow battery box and an all-vanadium liquid flow battery system, which can be directly pre-installed during factory production, saving time, being efficient and low in cost.

[0008] In order to solve the above problems, the present application provides a fully modular all-vanadium liquid flow battery box, including a box body, a module area and an electric control area, wherein the module area and the electric control area are arranged in the box body, the module area is provided with an all-vanadium liquid flow battery module, and the electric control area is provided with a cabinet;

[0009] The all-vanadium liquid flow battery module includes an electrolyte container, a carrier and a battery stack. The carrier is arranged on the electrolyte container, and the battery stack is arranged on the carrier.

[0010] Optionally, the fully modular all-vanadium liquid flow battery box includes a plurality of the all-vanadium liquid flow battery modules, at least two of the all-vanadium liquid flow battery modules are connected in parallel to form a module group, and when the fully modular all-vanadium liquid flow battery box includes at least two groups of the module groups, at least two groups of the module groups are connected in series.

[0011] Optionally, the all-vanadium liquid flow battery modules in the same group are arranged along a first direction, and different module groups are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0012] Optionally, the all-vanadium liquid flow battery module also includes an electrolyte pipeline, a circulation pump and an electric control valve. The electrolyte container is connected to the battery stack through the electrolyte pipeline. The circulation pump and the electric control valve are arranged on the electrolyte pipeline. The circulation pump and the electric control valve are electrically connected to the controller in the cabinet respectively.

[0013] Optionally, the all-vanadium liquid flow battery module includes two electrolyte containers, two circulation pumps, two groups of electrolyte pipelines and two electric control valves. The electrolyte containers, the circulation pumps, the electrolyte pipelines and the electric control valves are arranged in a one-to-one correspondence, and the circulation pumps are fixed on the side walls of the corresponding electrolyte containers.

[0014] Optionally, the electrolyte container is an IBC ton barrel, and two of the electrolyte containers are symmetrically arranged;

[0015] The circulating pump is a magnetic pump.

[0016] Optionally, the battery stack is centrally disposed in the carrier, and the carrier is centrally disposed on top of the electrolyte container.

[0017] Optionally, the cabinet includes a BMS battery management system cabinet and a DC power distribution cabinet, and the BMS battery management system cabinet and the DC power distribution cabinet are arranged in the electric control area.

[0018] Optionally, a partition is provided between the module area and the electric control area.

[0019] In another aspect of the present application, an all-vanadium liquid flow battery system is provided, comprising the fully modular all-vanadium liquid flow battery box as described above.

[0020] Beneficial Effects

[0021] A fully modular all-vanadium liquid flow battery box and an all-vanadium liquid flow battery system provided in the embodiments of the present invention realize modular manufacturing of the all-vanadium liquid flow battery box by setting a box body and setting module areas and electronic control areas in the box body according to functions, so that the design layout of the all-vanadium liquid flow battery box is more regular and regular, and a large number of parts in the all-vanadium liquid flow battery box can be directly pre-installed during factory production, making the production of the all-vanadium liquid flow battery box more time-saving and efficient, convenient for large-scale production, and low in production cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of a fully modular all-vanadium liquid flow battery box according to an embodiment of the present application.

[0023] The reference numerals are as follows:

[0024] 1. Box; 2. Battery stack; 3. Carrier; 4. Electrolyte container. DETAILED DESCRIPTION

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0028] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0029] See also Figure 1 As shown, according to an embodiment of the present application, a fully modular all-vanadium liquid flow battery box is provided, including a box body 1, a module area and an electric control area, the module area and the electric control area are arranged in the box body 1, the module area is provided with an all-vanadium liquid flow battery module, and the electric control area is provided with a cabinet.

[0030] The all-vanadium liquid flow battery module includes an electrolyte container 4 , a carrier 3 and a battery stack 2 . The carrier 3 is arranged on the electrolyte container 4 , and the battery stack 2 is arranged on the carrier 3 .

[0031] By setting up the box body 1 and setting the module area and the electronic control area in the box body 1 according to the function, modular manufacturing of the all-vanadium liquid flow battery box is realized, making the design layout of the all-vanadium liquid flow battery box more regular and neat, and a large number of parts in the all-vanadium liquid flow battery box can be directly pre-installed during factory production, making the production of the all-vanadium liquid flow battery box more time-saving and efficient, convenient for large-scale production, and low in production cost.

[0032] The box body 1 may be a container.

[0033] Among them, the module area and the electronic control area are arranged in a straight line.

[0034] Specifically, the module area is arranged in a straight line, and the electric control area is arranged at one end of the module area.

[0035] The module area and the electric control area are areas divided in the internal space of the box 1 .

[0036] The electrolyte container 4 is used to store the electrolyte.

[0037] The carrier 3 is used to place the battery stack 2. The carrier 3 may be a tray.

[0038] The fully modular all-vanadium liquid flow battery box includes multiple all-vanadium liquid flow battery modules, at least two all-vanadium liquid flow battery modules are connected in parallel to form a module group, and when the fully modular all-vanadium liquid flow battery box includes at least two module groups, at least two module groups are connected in series.

[0039] In the prior art, all-vanadium liquid flow battery modules in the battery box are connected in series, and multiple battery stacks 2 share a vanadium electrolyte in series. The number of single batteries in series N increases multiple times, and the branch self-discharge current is roughly proportional to N(N-1), resulting in a significant decrease in the energy efficiency of the battery stack 2 and the system. In this embodiment, at least two all-vanadium liquid flow battery modules are connected in parallel to form a module group, and at least two groups of module groups are connected in series, so that multiple battery stacks 2 are prevented from sharing a vanadium electrolyte in series, so that the battery stack 2 in this embodiment has a small branch self-discharge, and the battery stack 2 and the system have high energy efficiency.

[0040] Among them, the all-vanadium liquid flow battery modules in the same group are connected in parallel, and different module groups are connected in series.

[0041] Specifically, the all-vanadium redox flow battery modules in the same group are connected in parallel, which means that the battery stacks 2 of the all-vanadium redox flow battery modules in the same group are connected in parallel. Different module groups are connected in series, which means that the battery stacks 2 of different module groups are connected in series.

[0042] More specifically, each all-vanadium liquid flow battery module includes a battery stack 2 .

[0043] Among them, the fully modular all-vanadium liquid flow battery box includes an even number of all-vanadium liquid flow battery modules.

[0044] Specifically, in this embodiment, the fully modular all-vanadium liquid flow battery box includes eight all-vanadium liquid flow battery modules, and every two all-vanadium liquid flow battery modules are connected in parallel to form a module group, forming a total of four module groups, and the four module groups are connected in series.

[0045] The all-vanadium liquid flow battery modules in the same group are arranged along a first direction, and different module groups are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0046] The first direction and the second direction are two directions perpendicular to each other in a horizontal plane.

[0047] Specific, combined Figure 1 , the first direction can be understood as the left-right direction, and the second direction can be understood as the front-back direction.

[0048] The all-vanadium liquid flow battery module also includes an electrolyte pipeline, a circulation pump and an electric control valve. The electrolyte container 4 is connected to the battery stack 2 through the electrolyte pipeline. The circulation pump and the electric control valve are arranged on the electrolyte pipeline. The circulation pump and the electric control valve are electrically connected to the controller in the cabinet respectively.

[0049] Among them, each all-vanadium liquid flow battery module includes two electrolyte containers 4, two circulation pumps, two groups of electrolyte pipelines and two electric control valves. The electrolyte container 4, the circulation pump, the electrolyte pipeline and the electric control valve are arranged one by one. The circulation pump is fixed on the side wall of the corresponding electrolyte container 4, ensuring that each all-vanadium liquid flow battery module can work independently. Each has two independent electrolyte containers 4, two circulation pumps, two groups of electrolyte pipelines and two electric control valves, ensuring good working stability. At the same time, it also avoids multiple battery stacks 2 connected in series to share vanadium electrolyte, so that the battery stack 2 branch self-discharge in this embodiment is small, and the battery stack 2 and the system energy efficiency is high.

[0050] Specifically, Figure 1 As shown, the fully modular all-vanadium liquid flow battery box in this embodiment includes eight all-vanadium liquid flow battery modules, each of which includes two electrolyte containers 4, two circulation pumps, two sets of electrolyte pipelines and two electronically controlled valves.

[0051] Among them, the structures of all vanadium liquid flow battery modules are the same, which makes the components highly versatile.

[0052] Among them, one of the two electrolyte containers 4 is used to store the positive vanadium electrolyte, and the other is used to store the negative vanadium electrolyte. The two electrolyte containers 4 are connected to the battery stack 2 through corresponding electrolyte pipelines. A circulating pump is provided on each set of electrolyte pipelines, and the circulating pump is used to drive the positive vanadium electrolyte and the negative vanadium electrolyte to flow in the corresponding electrolyte pipelines, providing power for the positive vanadium electrolyte and the negative vanadium electrolyte. An electric control valve is provided on each set of electrolyte pipelines, and the opening and closing of the corresponding electrolyte pipeline is controlled by the electric control valve. The circulating pump and the electric control valve are electrically connected to the controller in the cabinet respectively, so that the start and stop of the circulating pump and the electric control valve are automatically controlled by the controller, thereby controlling the all-vanadium liquid flow battery module.

[0053] The electrolyte container 4 is an IBC ton barrel, and two electrolyte containers 4 are symmetrically arranged.

[0054] Among them, IBC ton barrel refers to IBC intermediate bulk container. The container barrel is composed of an inner container and a metal frame. The inner container is blow-molded with high molecular weight and high density polyethylene, which has high strength, corrosion resistance and good hygiene.

[0055] The electrolyte container 4 is fixed on the bottom plate of the box body 1 .

[0056] The circulation pump is a magnetic pump and is fixedly connected to the side wall of the corresponding electrolyte container 4 .

[0057] The battery stack 2 is centrally arranged in the carrier 3 , and the carrier 3 is centrally arranged on the top of the electrolyte container 4 , which ensures the stable arrangement of the battery stack 2 .

[0058] In this embodiment, each all-vanadium liquid flow battery module includes two electrolyte containers 4, a stack 2 and a carrier 3, the carrier 3 is arranged on the top of the two electrolyte containers 4 and located at the center, and the stack 2 is arranged at the center of the carrier 3. The stack 2 is connected to the two electrolyte containers 4 through electrolyte pipelines, and the flow of the electrolyte is controlled by the circulation pump and the electric control valve on the pipeline.

[0059] The cabinets include a BMS battery management system cabinet and a DC power distribution cabinet, and the BMS battery management system cabinet and the DC power distribution cabinet are arranged in the electric control area.

[0060] A partition is arranged between the module area and the electric control area, and the partition is arranged perpendicular to the first direction.

[0061] A partition is also arranged between each all-vanadium liquid flow battery module, and the partitions are also arranged perpendicular to the first direction mentioned above.

[0062] Example

[0063] Reference Figure 1 This embodiment provides a 130kW520kWh fully modularized all-vanadium liquid flow battery box, the box body 1 is a 40GP container, the outer dimensions of the box body 1 are 12192*2438*2591mm, and the inner dimensions of the box body 1 are 12032*2352*2385mm. The dimensions of the module area are 11400*2352*2385mm. The dimensions of the electric control area are 632*2352*2385mm.

[0064] Eight identical 16.25kW65kWh all-vanadium liquid flow battery modules are installed in the module area, and the eight 16.25kW65kWh all-vanadium liquid flow battery modules are symmetrically and evenly arranged in a 4×2 array and connected in series. Sixteen positive and negative vanadium electrolyte IBC barrels are symmetrically and evenly arranged in an 8×2 array and fixed on the bottom plate of the 40GP container. An MP-30RXM magnetic pump is installed on the side of each IBC barrel and above the liquid outlet ball valve. The liquid inlet of the magnetic pump is connected to the outlet of the liquid outlet ball valve at the bottom of the side of the IBC barrel through a Φ25PVC hard pipe, and the liquid outlet of the magnetic pump is connected to the liquid inlet hole of the stack 2 through a Φ25PVC hard pipe, and the liquid outlet hole of the stack 2 is connected to the vanadium electrolyte return pipe on the top cover of the IBC barrel through a Φ25PVC hard pipe.

[0065] A DC distribution cabinet is installed on the lower level of the electric control area, and a BMS battery management system cabinet is installed on the upper level to comprehensively monitor the voltage, current, temperature, flow rate, SOC state of charge and other parameters of each all-vanadium liquid flow battery module, and to provide perfect protection for each all-vanadium liquid flow battery module component.

[0066] 16.25kW65kWh vanadium battery module technical parameters:

[0067] Number of cells: 100.

[0068] Electrode area: 100cm×8cm=800cm 2 .

[0069] Rated current: 800cm 2 ×156.25mA / cm 2 =125A.

[0070] Rated voltage: 100×1.3V=130V.

[0071] Voltage range: 100~160V.

[0072] Rated power: 130V×125A=16.25kW.

[0073] Power density: 1.3V×156.25mA / cm 2 =203mW / cm 2 .

[0074] Vanadium electrolyte: 2×1300L=2.6m 3 3.64t 1.8M 3,4-valent vanadium sulfate electrolyte.

[0075] Rated energy: 2.6m 3 ×25kWh / m 3 =65kWh.

[0076] Rated time: 65kWh / 16.25kW=4h.

[0077] Rated energy efficiency: ≥75%.

[0078] 130kW520kWh vanadium battery box technical parameters:

[0079] Rated current: 125A.

[0080] Rated voltage: 8×130V=1040V.

[0081] Voltage range: 800~1280V.

[0082] Rated power: 1040V×125A=130kW.

[0083] Vanadium electrolyte: 8×2.6m 3 =20.8m 3 29.12t 1.8M 3,4-valent vanadium sulfate electrolyte.

[0084] Rated energy: 8×65kWh=520kWh.

[0085] Rated time: 520kWh / 130kW=4h.

[0086] Rated energy efficiency: ≥75%.

[0087] External dimensions of the box: 12192*2438*2591mm.

[0088] In another aspect of the present embodiment, an all-vanadium liquid flow battery system is provided, comprising the fully modular all-vanadium liquid flow battery box as described above.

[0089] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0090] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A fully modular all-vanadium liquid flow battery box, characterized in that: It comprises a box (1), a module area and an electric control area, wherein the module area and the electric control area are arranged in the box (1), an all-vanadium liquid flow battery module is arranged in the module area, and a cabinet is arranged in the electric control area; The all-vanadium liquid flow battery module comprises an electrolyte container (4), a carrier (3) and a battery stack (2), wherein the carrier (3) is arranged on the electrolyte container (4), and the battery stack (2) is arranged on the carrier (3).

2. The fully modular all-vanadium liquid flow battery box according to claim 1 is characterized in that: The fully modular all-vanadium liquid flow battery box includes a plurality of the all-vanadium liquid flow battery modules, at least two of the all-vanadium liquid flow battery modules are connected in parallel to form a module group, and when the fully modular all-vanadium liquid flow battery box includes at least two groups of the module groups, at least two groups of the module groups are connected in series.

3. The fully modular all-vanadium liquid flow battery box according to claim 2 is characterized in that: The all-vanadium liquid flow battery modules in the same group are arranged along a first direction, and different module groups are arranged along a second direction, and the first direction is perpendicular to the second direction.

4. The fully modular all-vanadium liquid flow battery box according to claim 1, characterized in that: The all-vanadium liquid flow battery module also includes an electrolyte pipeline, a circulation pump and an electric control valve. The electrolyte container (4) is connected to the battery stack (2) through the electrolyte pipeline. The circulation pump and the electric control valve are arranged on the electrolyte pipeline. The circulation pump and the electric control valve are respectively electrically connected to the controller in the cabinet.

5. The fully modular all-vanadium liquid flow battery box according to claim 4, characterized in that: The all-vanadium liquid flow battery module comprises two electrolyte containers (4), two circulation pumps, two groups of electrolyte pipelines and two electrically controlled valves. The electrolyte containers (4), the circulation pumps, the electrolyte pipelines and the electrically controlled valves are arranged in a one-to-one correspondence, and the circulation pumps are fixed on the side walls of the corresponding electrolyte containers (4).

6. The fully modular all-vanadium liquid flow battery box according to claim 5, characterized in that: The electrolyte container (4) is an IBC ton barrel, and two electrolyte containers (4) are symmetrically arranged; The circulating pump is a magnetic pump.

7. The fully modular all-vanadium liquid flow battery box according to claim 1, characterized in that: The battery stack (2) is centrally arranged in the carrier (3), and the carrier (3) is centrally arranged on the top of the electrolyte container (4).

8. The fully modular all-vanadium liquid flow battery box according to claim 1, characterized in that: The cabinet includes a BMS battery management system cabinet and a DC power distribution cabinet, and the BMS battery management system cabinet and the DC power distribution cabinet are arranged in the electric control area.

9. The fully modular all-vanadium liquid flow battery box according to claim 1, characterized in that: A partition is arranged between the module area and the electric control area.

10. An all-vanadium liquid flow battery system, characterized in that: It comprises a fully modular all-vanadium liquid flow battery box as described in any one of claims 1-9.

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