Electric pile frame plate sealing structure of all-vanadium redox flow battery

Abstract

The utility model provides an all-vanadium redox flow battery stack frame plate sealing structure, which comprises a bipolar frame, a bipolar plate and a pressing frame, the bipolar plate is fixed on the first side of the bipolar frame through the pressing frame, the pressing frame and the bipolar plate define a first reaction space, the first reaction space is used for introducing electrolyte, the bipolar frame is provided with a first liquid inlet flow channel and a first liquid outlet flow channel, and the first liquid inlet flow channel is communicated with the first liquid outlet flow channel. A plurality of liquid inlets and a plurality of liquid outlets are formed in the pressing frame, the plurality of liquid inlets are respectively communicated with the first liquid inlet runner, so that the electrolyte flows into the first reaction space through the plurality of liquid inlets, the plurality of liquid outlets are respectively communicated with the first liquid outlet runner, so that the electrolyte in the first reaction space flows into the first liquid outlet runner through the plurality of liquid outlets, and the electrolyte in the second reaction space flows into the second liquid outlet runner through the plurality of liquid outlets. According to the invention, the electrolyte can be fully and uniformly contacted with the bipolar plate, and the chemical reaction of the battery can be fully carried out, so that the capacity and the power density of the battery are improved.

Description

Technical Field

[0001] The present application belongs to the technical field of liquid flow batteries, and specifically relates to a sealing structure for a stack frame of an all-vanadium liquid flow battery. Background Art

[0002] All-vanadium flow battery is a redox battery with vanadium as the active material in a circulating liquid state. All-vanadium flow battery uses the change of vanadium ion valence to achieve the conversion between electrical energy and chemical energy. Vanadium ion solutions with different valence states are used as the active materials of the positive and negative electrodes, and are stored in the electrolyte storage tanks of the positive and negative electrodes respectively. During charging, the V 4+ Loses electrons to become V 5+ , negative V 3+ Get electrons to become V 2+ During the charge and discharge process, protons migrate in the proton exchange membrane to store or release energy.

[0003] In the existing all-vanadium liquid flow battery stack, the bipolar plates are clamped by the back faces of the adjacent positive and negative electrode frames of two adjacent single cells. The electrode liquid flows directly onto the bipolar plates through the holes on the positive and negative electrode frames. The electrolyte cannot fully and evenly contact the bipolar plates, resulting in a series of problems such as increased battery internal resistance, reduced battery capacity and decreased power density. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present application is to provide a sealing structure for the frame plate of an all-vanadium liquid flow battery stack, which can ensure sufficient contact between the electrode liquid and the bipolar plate.

[0005] In order to solve the above problems, the first aspect of the present application provides a sealing structure for an all-vanadium liquid flow battery stack frame plate, including a bipolar frame, a bipolar plate and a pressure frame, wherein the bipolar plate is fixed on the first side of the bipolar frame by the pressure frame, and the pressure frame and the bipolar plate enclose a first reaction space, and the first reaction space is used to pass the electrolyte, and the bipolar frame is provided with a first liquid inlet channel and a first liquid discharge channel, and the pressure frame is provided with a plurality of liquid inlets and a plurality of liquid discharge ports, and the plurality of liquid inlets are respectively connected with the first liquid inlet channel so that the electrolyte flows into the first reaction space through the plurality of liquid inlets, and the plurality of liquid discharge ports are respectively connected with the first liquid discharge channel so that the electrolyte in the first reaction space flows into the first liquid discharge channel through the plurality of liquid discharge ports.

[0006] Optionally, a plurality of the liquid inlets and a plurality of the liquid outlets are formed on the pressing frame.

[0007] Optionally, the plurality of liquid inlets are sequentially arranged along the extension direction of the outlet section of the first liquid inlet channel, and the plurality of liquid discharge ports are sequentially arranged along the extension direction of the inlet section of the first liquid discharge channel.

[0008] Optionally, the extension direction of the liquid inlet is perpendicular to the extension direction of the discharge port section, and the extension direction of the liquid discharge port is perpendicular to the extension direction of the inlet section.

[0009] Optionally, the first liquid inlet channel bends and extends periodically, and the outlet section is the last repeating unit in the first liquid inlet channel along the flow direction; the first liquid discharge channel bends and extends periodically, and the inlet section is the first repeating unit in the first liquid discharge channel along the flow direction.

[0010] Optionally, each repeating unit of the first liquid inlet flow channel is arranged in parallel, and each repeating unit of the first liquid discharge flow channel is arranged in parallel.

[0011] Optionally, each repeating unit of the first liquid inlet channel extends along a straight line, and the multiple liquid inlets are arranged along a straight line; each repeating unit of the first liquid discharge channel extends along a straight line, and the multiple liquid discharge ports are arranged along a straight line.

[0012] Optionally, a first connection structure is provided on the pressure frame, and a second connection structure is provided on the bipolar frame, and the pressure frame is fixedly connected to the bipolar frame via the first connection structure, the second connection structure and a connector.

[0013] Optionally, the bipolar frame is provided with a through groove running through the first side and the second side, and the bipolar plate cover is provided on the through groove to form a second reaction space on the second side of the bipolar frame, the second reaction space includes multiple inlets and multiple outlets, and a second liquid inlet channel and a second liquid discharge channel are formed on the second side of the bipolar frame, the second liquid inlet channel is connected to the second reaction space through multiple inlets, and the second liquid discharge channel is connected to the second reaction space through multiple outlets, the second liquid inlet channel is arranged corresponding to the first liquid discharge channel in the thickness direction of the bipolar frame, the second liquid discharge channel is arranged corresponding to the first liquid inlet channel in the thickness direction of the bipolar frame, the inlet is arranged corresponding to the discharge port in the thickness direction of the bipolar frame, and the outlet is arranged corresponding to the liquid inlet in the thickness direction of the bipolar frame.

[0014] A sealing ring is sleeved on the bipolar plate, and the sealing ring and the bipolar plate are fixed on the first side of the bipolar frame through the pressing frame.

[0015] Beneficial effects

[0016] The embodiment of the present invention provides a sealing structure for a stack frame of an all-vanadium liquid flow battery. By providing a press frame, the bipolar plate can be fixed to the bipolar frame and enclosed with the bipolar plate to form a first reaction space, providing a space for the electrolyte and the bipolar plate to react. By providing multiple liquid inlets and multiple liquid discharge ports on the press frame, and the multiple liquid inlets are respectively connected to the first liquid inlet flow channel, and the multiple liquid discharge ports are respectively connected to the first liquid discharge flow channel, the electrolyte can flow into the first reaction space through the multiple liquid inlets and into the first liquid discharge flow channel through the multiple liquid discharge ports. This allows the electrolyte to contact the bipolar plate more fully and evenly, allowing the chemical reaction of the battery to proceed more fully, thereby improving the battery capacity and power density. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the first side of the sealing structure of the stack frame plate of the all-vanadium liquid flow battery according to an embodiment of the present application;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the second side of the sealing structure of the frame plate of the all-vanadium liquid flow battery stack according to an embodiment of the present application;

[0020] Figure 4 This is a schematic diagram of the three-dimensional structure of the first side of the bipolar frame according to an embodiment of the present application;

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the second side of the bipolar frame according to an embodiment of the present application;

[0022] Figure 6 Schematic diagram of the three-dimensional structure of the pressure frame according to an embodiment of the present application.

[0023] The reference numerals indicate:

[0024] 1. Bipolar frame; 11. First liquid inlet channel; 111. Discharge port section; 12. First liquid discharge channel; 121. Inlet section; 13. Second liquid inlet channel; 14. Second liquid discharge channel; 15. Inlet; 16. Outlet; 17. Second connecting structure; 2. Press frame; 21. Liquid inlet; 22. Liquid discharge port; 23. First connecting structure; 3. Bipolar plate. DETAILED DESCRIPTION

[0025] In the description of this 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 to 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 device or element referred to 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] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on 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 Figures 1 to 6 As shown, according to the first aspect of an embodiment of the present application, a sealing structure for an all-vanadium liquid flow battery stack frame plate is provided, comprising a bipolar frame 1, a bipolar plate 3 and a pressure frame 2, wherein the bipolar plate 3 is fixed on the first side of the bipolar frame 1 through the pressure frame 2, and the pressure frame 2 and the bipolar plate 3 enclose a first reaction space, which is used to introduce an electrolyte, and a first liquid inlet channel 11 and a first liquid discharge channel 12 are provided on the bipolar frame 1, and a plurality of liquid inlets 21 and a plurality of liquid discharge ports 22 are provided on the pressure frame 2, wherein the plurality of liquid inlets 21 are respectively connected to the first liquid inlet channel 11 so that the electrolyte flows into the first reaction space via the plurality of liquid inlets 21, and the plurality of liquid discharge ports 22 are respectively connected to the first liquid discharge channel 12 so that the electrolyte in the first reaction space flows into the first liquid discharge channel 12 via the plurality of liquid discharge ports 22.

[0030] By providing the press frame 2, the bipolar plate 3 can be fixed to the bipolar frame 1 and enclosed with the bipolar plate 3 to form a first reaction space, providing space for the electrolyte to react with the bipolar plate 3. By providing multiple liquid inlets 21 and multiple liquid discharge ports 22 on the press frame 2, and the multiple liquid inlets 21 are respectively connected to the first liquid inlet channel 11, and the multiple liquid discharge ports 22 are respectively connected to the first liquid discharge channel 12, the electrolyte can flow into the first reaction space through the multiple liquid inlets 21 and into the first liquid discharge channel 12 through the multiple liquid discharge ports 22. This allows the electrolyte to contact the bipolar plate 3 more fully and evenly, allowing the chemical reaction of the battery to proceed more fully, thereby improving the battery capacity and power density.

[0031] Among them, the bipolar frame 1 is a frame structure, specifically a rectangular frame. A through groove is provided in the middle of the bipolar frame 1, and the through groove passes through the bipolar frame 1 along the thickness direction of the bipolar frame 1. The bipolar plate 3 is covered on the through groove so that the electrolyte on both sides of the bipolar frame 1 can contact the bipolar plate 3.

[0032] The bipolar frame 1 is provided with a mounting groove, the groove depth of which is the same as the thickness of the bipolar plate 3 and the shape of which is adapted so that the bipolar plate 3 can be adaptively arranged in the mounting groove.

[0033] The pressing frame 2 is in contact with the bipolar frame 1 and the electrode plate respectively, that is, the pressing frame 2 extends along the connection between the electrode plate and the notch of the mounting groove, thereby simultaneously contacting the bipolar frame 1 and the electrode plate and sealing the connection.

[0034] The pressing frame 2 is fixedly connected to the bipolar frame 1 and abuts against the bipolar plate 3, and then presses tightly on the contact between the electrode plate and the mounting groove, so as to firmly fix the bipolar plate 3 in the mounting groove.

[0035] The mounting slot is a rectangular slot, the bipolar plate 3 is a rectangle, and the pressing frame 2 is a rectangular frame, and the shapes and sizes of the two are adapted to each other.

[0036] The pressing frame 2 is integrally formed, and a plurality of liquid inlets 21 and a plurality of liquid outlets 22 are integrally formed on the pressing frame 2 .

[0037] Among them, a plurality of liquid inlets 21 and a plurality of liquid outlets 22 are arranged on one side of the pressing frame 2, and the other side is a smooth plane.

[0038] Specifically, a wall surface of the bipolar frame 1 on a side away from the bipolar plate 3 is provided with a plurality of liquid inlets 21 and a plurality of liquid outlets 22 , and a wall surface contacting the bipolar plate 3 is a plane.

[0039] The liquid inlet 21 is provided on one side of the pressing frame 2 , and the liquid outlet 22 is provided on the opposite side of the pressing frame 2 .

[0040] Among them, the electrolyte enters the first liquid inlet channel 11 from the liquid inlet hole on the bipolar frame 1, flows into the first reaction space through the first liquid inlet channel 11 and multiple liquid inlet ports 21, reacts with the bipolar plate 3 in the first reaction space, and then flows into the first drainage channel 12 through multiple drainage ports 22, and flows to the drainage hole on the bipolar frame 1 through the first drainage channel 12, and finally flows out from the drainage hole.

[0041] Among them, one battery can include multiple all-vanadium liquid flow battery stack frame plate sealing structures, and the pressure frame 2 in the all-vanadium liquid flow battery stack frame plate sealing structure can also abut against the bipolar plate 3 or end plate in the adjacent all-vanadium liquid flow battery stack frame plate sealing structure, and then enclose together with the pressure frame 2 to form a first reaction space.

[0042] Multiple liquid inlets 21 and multiple liquid discharge ports 22 are formed on the pressing frame 2. After the pressing frame 2 is installed on the bipolar frame 1, the multiple liquid inlets 21 and multiple liquid discharge ports 22 can be arranged. The installation process is simple and convenient.

[0043] Among them, all the liquid inlets 21 and all the liquid outlets 22 are arranged on the pressing frame 2 .

[0044] Specifically, all the liquid inlets 21 and all the liquid outlets 22 are integrally formed with the pressing frame 2 .

[0045] Multiple liquid inlets 21 are arranged in sequence along the extension direction of the discharge section 111 of the first liquid inlet channel 11, and multiple liquid discharge ports 22 are arranged in sequence along the extension direction of the inlet section 121 of the first liquid discharge channel 12, so that the electrolyte can enter the first reaction space more evenly, avoiding the situation where the local electrolyte concentration is too high or too low, thereby improving the uniformity and stability of the internal reaction of the battery.

[0046] The drainage ports 22 are arranged sequentially along the direction of the inlet section 121 of the first drainage channel 12, facilitating smoother electrolyte discharge after the reaction, reducing electrolyte retention within the reaction space and improving battery efficiency. Uniform electrolyte distribution and a smooth flow path help reduce fluctuations in the battery's internal resistance, improve the battery's charge and discharge performance, and enhance the battery's stability and reliability during use.

[0047] The outlet section 111 of the first liquid inlet channel 11 extends along a straight line, and the plurality of liquid inlets 21 are arranged along a straight line.

[0048] The inlet section 121 of the first liquid discharge channel 12 extends along a straight line, and the plurality of liquid discharge ports 22 are arranged along the straight line.

[0049] The extending direction of the liquid inlet 21 is perpendicular to the extending direction of the discharge port section 111 , and the extending direction of the liquid discharge port 22 is perpendicular to the extending direction of the inlet section 121 .

[0050] By aligning the inlet 21 and the outlet section 111 perpendicularly, and the outlet 22 and the inlet section 121 perpendicularly, the electrolyte can flow into and out of the first reaction space more smoothly. This perpendicular orientation reduces fluid resistance and improves the speed and efficiency of liquid inflow and outflow.

[0051] This helps the electrolyte to be more evenly distributed throughout the first reaction space when entering it. Similarly, during drainage, the reacted electrolyte can be more effectively discharged, avoiding localized accumulation or residue, thereby improving the uniformity and stability of the reaction within the battery.

[0052] The liquid inlet 21 is a long strip-shaped opening with a certain length, that is, the electrolyte can enter the first reaction space only after flowing a certain distance along the extension direction of the liquid inlet 21 .

[0053] Specifically, a plurality of protrusions are formed on the pressing frame 2 , and the plurality of protrusions extend along the width direction. The plurality of protrusions are arranged along the length direction of the pressing frame 2 , and a liquid inlet 21 is formed between adjacent protrusions, and the liquid inlet 21 extends along the width direction of the pressing frame 2 .

[0054] The drain port 22 is a long strip-shaped opening with a certain length, that is, the electrolyte can enter the inlet section 121 only after flowing a certain distance along the extension direction of the drain port 22 .

[0055] Specifically, a plurality of protrusions are formed on the pressing frame 2 , and the plurality of protrusions extend along the width direction. The plurality of protrusions are arranged along the length direction of the pressing frame 2 , and a drainage port 22 is formed between adjacent protrusions, and the drainage port 22 extends along the width direction of the pressing frame 2 .

[0056] The drain ports 22 are arranged opposite to each other in the width direction of the pressing frame 2 .

[0057] The first liquid inlet channel 11 bends and extends periodically, and the outlet section 111 is the last repeating unit in the first liquid inlet channel 11 along the flow direction. The first liquid discharge channel 12 bends and extends periodically, and the inlet section 121 is the first repeating unit in the first liquid discharge channel 12 along the flow direction.

[0058] The periodic bending and extension of the first liquid inlet channel 11 reduces the impact force of the electrolyte entering the first liquid inlet channel 11. The outlet section 111, as the last repeating unit in the flow direction of the first liquid inlet channel 11, can more evenly distribute the electrolyte to each liquid inlet 21, thereby improving the uniformity of the electrolyte distribution within the first reaction space.

[0059] The first drainage channel 12 periodically bends and extends, reducing the impact force during electrolyte discharge. The inlet section 121 is the first repeating unit in the first drainage channel 12 along the flow direction, allowing the electrolyte in the first reaction space to evenly enter the inlet section 121 through the multiple drainage ports 22.

[0060] Each repeating unit of the first liquid inlet channel 11 is arranged in parallel, and each repeating unit of the first liquid discharge channel 12 is arranged in parallel, so that the layout of the channels is more neat and regular, which is convenient for manufacturing and installation, and is also beneficial to improving the overall structural stability of the battery.

[0061] The first liquid inlet channel 11 extends in a serpentine shape, and the first liquid discharge channel 12 extends in a serpentine shape.

[0062] Each repeating unit of the first liquid inlet channel 11 extends along a straight line, and multiple liquid inlet ports 21 are arranged along a straight line. Each repeating unit of the first liquid discharge channel 12 extends along a straight line, and multiple liquid discharge ports 22 are arranged along a straight line, thereby reducing the resistance of the electrolyte during the flow process, improving the flow efficiency of the electrolyte, and reducing energy loss.

[0063] In the first liquid inlet channel 11 , there is an arc-shaped transition between adjacent repeating units.

[0064] In the first liquid discharge channel 12 , adjacent repeating units have arc-shaped transitions.

[0065] Each repeating unit in the first liquid inlet channel 11 extends along the length direction of the pressing frame 2 and is arranged in sequence along the width direction.

[0066] Each repeating unit in the first liquid drainage channel 12 extends along the length direction of the pressing frame 2 and is arranged in sequence along the width direction.

[0067] The first liquid inlet channel 11 and the first liquid discharge channel 12 are correspondingly arranged, have the same length and the same channel width.

[0068] A first connecting structure 23 is provided on the press frame 2, and a second connecting structure 17 is provided on the bipolar frame 1. The press frame 2 is fixedly connected to the bipolar frame 1 through the first connecting structure 23, the second connecting structure 17 and the connecting piece, which can stably fix the press frame 2 on the bipolar frame 1, and then firmly fix the bipolar plate 3 on the bipolar frame 1.

[0069] The first connection structure 23 is a through hole or a bolt hole, and the second connection structure 17 is a bolt hole. The connection member is a screw or a rivet.

[0070] Specifically, the pressure frame 2 is provided with a plurality of through holes, and the bipolar frame 1 is provided with threaded holes, which are arranged one by one opposite to the through holes and connected by a plurality of screws. The screws pass through the through holes and are threadedly connected in the corresponding threaded holes to achieve fixation.

[0071] The bipolar frame 1 is provided with a through-groove extending through the first and second sides, which is the aforementioned through-groove. The bipolar plate 3 is mounted on the through-groove to form a second reaction space on the second side of the bipolar frame 1. The second reaction space includes multiple inlets 15 and multiple outlets 16. A second liquid inlet channel 13 and a second liquid discharge channel 14 are formed on the second side of the bipolar frame 1. The second liquid inlet channel 13 communicates with the second reaction space via the multiple inlets 15, and the second liquid discharge channel 14 communicates with the second reaction space via the multiple outlets 16. The second liquid inlet channel 13 is arranged corresponding to the first liquid discharge channel 12 along the thickness of the bipolar frame 1, and the second liquid discharge channel 14 is arranged corresponding to the first liquid inlet channel 11 along the thickness of the bipolar frame 1. The inlet 15 is arranged corresponding to the liquid discharge port 22 along the thickness of the bipolar frame 1, and the outlet 16 is arranged corresponding to the liquid inlet 21 along the thickness of the bipolar frame 1.

[0072] By arranging the second liquid inlet channel 13 , the second liquid outlet channel 14 and the second reaction space on the second side of the bipolar frame 1 , the bipolar plate 3 can be brought into contact with the electrolyte on the second side, thereby achieving charging and discharging.

[0073] Among them, the second liquid inlet channel 13 and the second liquid discharge channel 14 as well as the multiple inlets 15 and the multiple outlets 16 are all integrally formed on the bipolar frame 1. No pressure frame 2 is provided on the second side of the bipolar frame 1, which reduces the number of components, ensures good stability, reduces the risk of leakage, and makes the bipolar frame 1 easy to install.

[0074] The second liquid inlet channel 13 has the same shape and size as the first liquid inlet channel 11 and is opposite the first liquid discharge channel 12 in the thickness direction. The second liquid discharge channel 14 has the same shape and size as the second liquid discharge channel 14 and is opposite the first liquid inlet channel 11 in the thickness direction. The first reaction space has the same shape and size as the second reaction space. The inlet 15 is arranged opposite to the liquid discharge port 22 in the thickness direction of the bipolar frame 1 and has the same shape and size. The outlet 16 is arranged opposite to the liquid inlet 21 in the thickness direction of the bipolar frame 1 and has the same shape and size.

[0075] Since the configuration of the second side of the bipolar frame 1 is the same as that of the first side of the bipolar frame 1 described above, the only difference is that the bipolar frame 1 is not provided, and a protrusion similar to the bipolar frame 1 is integrally formed, and the inlet 15 and the outlet 16 are formed on the protrusion, the working principles of the two sides are the same and the structure is basically the same, so they are not repeated here.

[0076] A sealing ring is sleeved on the bipolar plate, and the sealing ring and the bipolar plate 3 are fixed on the first side of the bipolar frame 1 through the pressing frame 2.

[0077] The sealing ring is sleeved along the outer edge of the bipolar plate 3 , and the pressing frame 2 simultaneously presses the outer edge of the bipolar plate 3 and the sealing ring into the mounting groove.

[0078] 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.

[0079] The above are merely 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 within the scope of protection of the present application. The above are merely preferred embodiments of the present application. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present application, and such improvements and variations shall also be considered within the scope of protection of the present application.

Claims

1. A sealing structure for a stack frame of an all-vanadium liquid flow battery, characterized in that: The invention comprises a bipolar frame (1), a pressing frame (2) and a bipolar plate (3), wherein the bipolar plate (3) is fixed on a first side of the bipolar frame (1) by the pressing frame (2), and the pressing frame (2) and the bipolar plate (3) enclose a first reaction space, wherein the first reaction space is used for introducing an electrolyte, the bipolar frame (1) is provided with a first liquid inlet channel (11) and a first liquid discharge channel (12), and the pressing frame (2) is provided with a plurality of liquid inlets (21) and a plurality of liquid discharge channels (22), wherein the plurality of liquid inlets (21) are respectively connected to the first liquid inlet channel (11) so that the electrolyte flows into the first reaction space via the plurality of liquid inlets (21), and the plurality of liquid discharge channels (22) are respectively connected to the first liquid discharge channel (12) so that the electrolyte in the first reaction space flows into the first liquid discharge channel (12) via the plurality of liquid discharge channels (22).

2. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 1, characterized in that: A plurality of liquid inlets (21) and a plurality of liquid outlets (22) are formed on the pressing frame (2).

3. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 1, characterized in that: The plurality of liquid inlets (21) are arranged in sequence along the extension direction of the outlet section (111) of the first liquid inlet channel (11), and the plurality of liquid discharge ports (22) are arranged in sequence along the extension direction of the inlet section (121) of the first liquid discharge channel (12).

4. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 3, characterized in that: The extension direction of the liquid inlet (21) is perpendicular to the extension direction of the discharge port section (111), and the extension direction of the liquid discharge port (22) is perpendicular to the extension direction of the inlet section (121).

5. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 3, characterized in that: The first liquid inlet channel (11) is periodically bent and extended, and the outlet section (111) is the last repeating unit in the first liquid inlet channel (11) along the flow direction; the first liquid discharge channel (12) is periodically bent and extended, and the inlet section (121) is the first repeating unit in the first liquid discharge channel (12) along the flow direction.

6. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 5, characterized in that: Each repeating unit of the first liquid inlet flow channel (11) is arranged in parallel, and each repeating unit of the first liquid discharge flow channel (12) is arranged in parallel.

7. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 6, characterized in that: Each repeating unit of the first liquid inlet channel (11) extends along a straight line, and the plurality of liquid inlet ports (21) are arranged along a straight line; each repeating unit of the first liquid discharge channel (12) extends along a straight line, and the plurality of liquid discharge ports (22) are arranged along a straight line.

8. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 1, characterized in that: The pressure frame (2) is provided with a first connection structure (23), the bipolar frame (1) is provided with a second connection structure (17), and the pressure frame (2) is fixedly connected to the bipolar frame (1) via the first connection structure (23), the second connection structure (17) and a connecting piece.

9. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 1, characterized in that: The bipolar frame (1) is provided with a through groove running through the first side and the second side, and the bipolar plate (3) is covered on the through groove to form a second reaction space on the second side of the bipolar frame (1), the second reaction space including a plurality of inlets (15) and a plurality of outlets (16), a second liquid inlet flow channel (13) and a second liquid discharge flow channel (14) are formed on the second side of the bipolar frame (1), the second liquid inlet flow channel (13) is connected to the second reaction space through the plurality of inlets (15), and the second liquid discharge flow channel (14) is connected to the second reaction space through the plurality of inlets (15). The outlet (16) is connected to the second reaction space, the second liquid inlet channel (13) is arranged in the thickness direction of the bipolar frame (1) corresponding to the first liquid discharge channel (12), the second liquid discharge channel (14) is arranged in the thickness direction of the bipolar frame (1) corresponding to the first liquid inlet channel (11), the inlet (15) is arranged in the thickness direction of the bipolar frame (1) corresponding to the liquid discharge port (22), and the outlet (16) is arranged in the thickness direction of the bipolar frame (1) corresponding to the liquid inlet (21).

10. The all-vanadium liquid flow battery stack frame plate sealing structure according to claim 1, characterized in that: A sealing ring is sleeved on the bipolar plate, and the sealing ring and the bipolar plate (3) are fixed on the first side of the bipolar frame (1) through the pressing frame (2).

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