Electrode frame public flow channel sealing structure for flow battery

Abstract

The utility model relates to an electrode frame public flow channel sealing structure for a flow battery, which belongs to the technical field of flow batteries and comprises a first sealing main body and a second sealing main body, the first sealing main body, the second sealing main body and an electrode frame are integrally formed, and the first sealing main body comprises a first plug connector and a second plug connector which are positioned on the periphery of a first through hole; the second plug connector and the flow channel are located on the same side of the electrode frame, and the first plug connector is located on the other side of the electrode frame; the second sealing main body comprises a third plug connector and a fourth plug connector which are located on the periphery of the second through hole, the fourth plug connector and the flow channel are located on the same side of the electrode frame, and the third plug connector is located on the other side of the electrode frame; the second plug connector and the third plug connector are connected in an inserted mode to form sealing, and the fourth plug connector and the first plug connector are connected in an inserted mode to be communicated with the flow channel. The sealing structure is high in reliability, low in cost, simple in process and capable of remarkably improving production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid flow batteries, and more specifically, to a common flow channel sealing structure of an electrode frame for a liquid flow battery. Background Art

[0002] The all-vanadium redox flow battery system consists of two electrolyte storage tanks, a fuel cell stack, and other components such as electrolyte delivery pipes. The electrolyte storage tanks hold the positive and negative electrolytes, respectively. The fuel cell stack is composed of multiple stacked cells. A proton exchange membrane separates the positive and negative electrodes, dividing the cells into two "half-cells." The positive and negative electrolytes are connected to their respective electrolyte storage tanks and circulate within their respective "half-cells," enabling the battery's charge and discharge processes.

[0003] The stack has four inlets and outlets: a positive electrolyte inlet, a positive electrolyte outlet, a negative electrolyte inlet, and a negative electrolyte outlet. The stack's positive and negative electrode frames are arranged alternately, each with a common channel for the positive electrolyte inlet, a common channel for the positive electrolyte outlet, a common channel for the negative electrolyte inlet, and a common channel for the negative electrolyte outlet. The positive electrode electrolyte inlet common channel and the positive electrode electrolyte outlet common channel on the positive electrode frame are connected to the central through-hole of the positive electrode frame for placing the positive electrode, that is, the positive electrode electrolyte enters the positive electrode electrolyte inlet common channel from the positive electrode electrolyte inlet, flows from the positive electrode electrolyte inlet common channel into the electrode area in the central through-hole of the positive electrode frame, and then flows out of the battery stack from the positive electrode electrolyte outlet common channel and the positive electrode electrolyte outlet. The negative electrode electrolyte inlet common channel and the negative electrode electrolyte outlet common channel on the positive electrode frame are not connected to the electrode area, that is, the negative electrode electrolyte only passes through the negative electrode electrolyte inlet common channel and the negative electrode electrolyte outlet common channel on the positive electrode frame. Similarly, the negative electrode electrolyte inlet common channel and the negative electrode electrolyte outlet common channel on the negative electrode frame are connected to the central through-hole of the negative electrode frame for placing the electrode, and the positive electrode electrolyte inlet common channel and the positive electrode electrolyte outlet common channel on the negative electrode frame are not connected to the central through-hole. The single cells in the battery stack share the same inlet and outlet common flow channel. To ensure that the positive and negative electrolytes in the battery stack do not mix with each other, it is necessary to seal the negative electrode electrolyte inlet common channel and the negative electrode electrolyte outlet common channel on the positive electrode frame, and the positive electrode electrolyte inlet common channel and the positive electrode electrolyte outlet common channel on the negative electrode frame.

[0004] Currently, the most common sealing methods used are sealing strips or gaskets, laser welding, and hot melt adhesives. Sealing strips or gaskets can provide a short-term seal, but after prolonged battery operation, aging and creep of the sealing material can lead to seal failure. While laser welding can achieve effective sealing, the high cost and short service life of laser welding equipment make it difficult to widely use in battery production. Hot melt adhesive sealing is temperature-sensitive. When the battery stack is charging and discharging, heat is released, raising the temperature of the stack and affecting the hot melt adhesive, reducing its sealing performance. Summary of the Invention

[0005] In order to solve the above problems of the prior art, the utility model provides an electrode frame common flow channel sealing structure for a liquid flow battery. This sealing structure has high reliability, low cost, simple process, and can significantly improve production efficiency.

[0006] The present invention provides an electrode frame common flow channel sealing structure for a liquid flow battery, the liquid flow battery comprising an electrode frame, the electrode frame being provided with a flow channel and an electrolyte common flow channel through hole; the electrolyte common flow channel through hole of the electrode frame comprising a first through hole and a second through hole; the second through hole being connected to the flow channel; the first through hole being not connected to the flow channel; based on the existing technology, the present invention further makes the following improvements:

[0007] The first sealing body and the second sealing body are integrally formed with the electrode frame. The first sealing body includes a first plug-in connector and a second plug-in connector located on the periphery of the first through hole. The second plug-in connector and the flow channel are located on the same side of the electrode frame, and the first plug-in connector is located on the other side of the electrode frame. The second sealing body includes a third plug-in connector and a fourth plug-in connector located on the periphery of the second through hole. The fourth plug-in connector and the flow channel are located on the same side of the electrode frame, and the third plug-in connector is located on the other side of the electrode frame.

[0008] The second connector forms a seal when plugged into the third connector, and the fourth connector communicates with the flow channel when plugged into the first connector.

[0009] Preferably, the first sealing body includes a first intermediate plate integral with the electrode frame, the first connector is a first boss located on one side of the first intermediate plate, the second connector is a first inner rib and a first outer rib located on the other side of the first intermediate plate, a first groove for plugging in a third connector is formed between the first inner rib and the first outer rib, and the middle part of the first intermediate plate is a first through hole.

[0010] Preferably, the second sealing body includes a second intermediate plate integral with the electrode frame, the third plug-in connector is a second boss located on one side of the second intermediate plate, the fourth plug-in connector is a second inner rib and a second outer rib located on the other side of the second intermediate plate, a second groove for plugging in the first plug-in connector is formed in the middle of the second inner rib and the second outer rib, and the middle part of the second intermediate plate is a second through hole.

[0011] Preferably, the second connector and the third connector are axially arranged along the common flow channel of the electrode frame, and the axial length of the second connector is 120%-140% of the axial length of the third connector.

[0012] Preferably, the first connector and the fourth connector are axially arranged along the common flow channel of the electrode frame, and the axial length of the fourth connector is 120-140% of the axial length of the first connector.

[0013] Preferably, the second connector is radially opposite to the fourth connector.

[0014] Preferably, the first boss includes a plurality of first arc-shaped protrusions arranged at intervals in the circumferential direction and perpendicular to the first intermediate plate, and the intervals between the first arc-shaped protrusions serve as first flow channel openings.

[0015] Preferably, the first arc-shaped protrusion of the first boss is connected to the first intermediate plate via a first circular ring.

[0016] Preferably, the second boss includes a plurality of second arc-shaped protrusions arranged at intervals in the circumferential direction.

[0017] Preferably, the second arc-shaped protrusion of the second boss is connected to the second intermediate plate via a second circular ring.

[0018] Preferably, the second boss is a circular ring with a certain height and perpendicular to the second middle plate.

[0019] Preferably, the first inner convex rib and the first outer convex rib are both circular rings with a certain height and perpendicular to the first middle plate, and the first outer convex rib is located on the outer ring of the first inner convex rib.

[0020] Preferably, the second inner rib includes a plurality of second arc-shaped inner ribs arranged at intervals in the circumferential direction and perpendicular to the second middle plate, the second outer rib includes a plurality of second arc-shaped outer ribs arranged at intervals in the circumferential direction and perpendicular to the second middle plate, the spacing between the second arc-shaped inner ribs is the second flow channel opening, and the spacing between the second arc-shaped outer ribs is the third flow channel opening.

[0021] Preferably, the second arc-shaped inner convex block is connected to the second middle plate via a second inner circular ring, and the second arc-shaped outer convex block is connected to the second middle plate via a second outer circular ring.

[0022] The technical effect of the utility model is that it adopts a patented sealing structure with good stability. Compared with sealing with sealing strips or sealing gaskets, it does not have the risk of aging creep and the like; compared with hot melt adhesive sealing, it is less sensitive to temperature, and the temperature change of the battery stack has little effect on the sealing structure; compared with laser welding sealing, there is no need to purchase a laser welding machine separately, which saves costs; the manufacturing process of the sealing structure is simple, the cost is low, and the sealing effect is good. It only requires the electrode frames to be assembled in sequence, which can significantly improve production efficiency.

[0023] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0025] Figure 1 It is a schematic diagram of the stacking of electrode frames.

[0026] Figure 2 yes Figure 1 Top view of .

[0027] Figure 3 yes Figure 1 AA section view.

[0028] Figure 4 yes Figure 1 BB section view.

[0029] Figure 5 It is an assembly diagram of the sealing structure of the utility model.

[0030] Figure 6 This is a perspective view of the first sealing body of Example 1.

[0031] Figure 7 This is another perspective view of the first sealing body of Example 1.

[0032] Figure 8 This is a side view of the first sealing body of Example 1.

[0033] Figure 9 This is a perspective view of the second sealing body of Example 1.

[0034] Figure 10 This is another perspective view of the second sealing body of Example 1.

[0035] Figure 11 This is a side view of the second sealing body of Example 1.

[0036] Figure 12 This is a perspective view of the first sealing body of Example 2.

[0037] Figure 13 This is a perspective view of the second sealing body of Example 2.

[0038] Figure 14 This is a perspective view of the second sealing body of Example 3.

[0039] Figure 15 This is a perspective view of the second sealing body of Example 4.

[0040] Figure 16 It is a structural schematic diagram of the positive electrode frame of Example 1.

[0041] Figure 17 It is a structural schematic diagram of the negative electrode frame of Example 1.

[0042] Figure annotation:

[0043] First sealing body 1, second sealing body 2, first intermediate plate 11, first boss 12, first inner rib 13, first outer rib 14, first groove 15, first through hole 16, first ring 17, first arcuate protrusion 121, first flow channel opening 122, second intermediate plate 21, second boss 22, second inner rib 23, second outer rib 24, second groove 25, second through hole 26, second flow channel opening 27, second ring 28, second arcuate protrusion 221, second arcuate inner protrusion 231, second arcuate outer protrusion 241, second inner ring 232, second outer ring 242;

[0044] Positive electrode electrolyte inlet common flow channel 100, positive electrode electrolyte outlet common flow channel 200, negative electrode electrolyte inlet common flow channel 300, negative electrode electrolyte outlet common flow channel 400; electrode area 3, flow channel 4. DETAILED DESCRIPTION

[0045] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0046] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present invention, its application, or uses.

[0047] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0048] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0049] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0050] Example

[0051] Figure 1-4 The figure shows a schematic diagram of an electrode frame for a flow battery. Figure 1 The middle zone I is the positive electrode electrolyte chamber, which contains positive electrode electrolyte, and the middle zone II is the negative electrode electrolyte chamber, which contains negative electrode electrolyte. Figure 2 The positive electrode electrolyte inlet i, the positive electrode electrolyte outlet ii, the negative electrode electrolyte inlet iii, and the negative electrode electrolyte outlet iv are shown. Figure 1 AA cross-section Figure 3 A positive electrode electrolyte inlet common flow channel 100 and a positive electrode electrolyte outlet common flow channel 200 are shown. Figure 1 BB cross-section Figure 4 The diagram shows the negative electrode electrolyte inlet common flow channel 300 and the negative electrode electrolyte outlet common flow channel 400. In order to prevent the positive and negative electrolytes from mixing, the common flow channel portion where the single cells are located needs to be sealed in a compartmentalized manner.

[0052] Example 1

[0053] In order to solve the above technical problems, refer to Figure 5 This embodiment provides a common flow channel sealing structure for an electrode frame of a liquid flow battery. The liquid flow battery includes an electrode frame, which is provided with a flow channel and a common electrolyte flow channel through hole. The common electrolyte flow channel through hole of the electrode frame includes a first through hole 16 and a second through hole 26. The second through hole 26 is connected to the flow channel. The first through hole 16 is not connected to the flow channel.

[0054] The sealing structure includes a first sealing body 1 and a second sealing body 2. The first sealing body 1 and the second sealing body 2 are integrally formed with the electrode frame. The first sealing body 1 includes a first connector and a second connector located on the periphery of the first through hole 16. The second connector and the flow channel are located on the same side of the electrode frame, and the first connector is located on the other side of the electrode frame. The second sealing body 2 includes a third connector and a fourth connector located on the periphery of the second through hole 26. The fourth connector and the flow channel are located on the same side of the electrode frame, and the third connector is located on the other side of the electrode frame.

[0055] The second plug-in connector forms a seal after being plugged into the third plug-in connector, and the fourth plug-in connector communicates with the flow channel after being plugged into the first plug-in connector.

[0056] like Figure 6-8 , 16. The first sealing body 1 includes a first intermediate plate 11 integrally formed with the electrode frame. The first connector is a first boss 12 located on one side of the first intermediate plate 11. The second connector is a first inner rib 13 and a first outer rib 14 located on the other side of the first intermediate plate 1. The first boss 12 can be multi-layered, with a first groove 15 formed between the first inner rib 13 and the first outer rib 14. The first through hole 16 in the center of the first intermediate plate 11 is a common electrolyte flow channel through hole that is not connected to the flow channel on the electrode frame. The first through hole 16 is circular and is used to circumferentially circumferentially circumferentially and perpendicular to the first intermediate plate 11. The first arcuate protrusions 121 are arranged axially along the common flow channel of the electrode frame. The intervals between the first arcuate protrusions 121 are first flow channel openings 122. The first inner convex rib 13 and the first outer convex rib 14 are both circular rings with a certain height and perpendicular to the first intermediate plate 11. The diameter of the first outer convex rib 14 is larger than that of the first inner convex rib 13 and is located outside the first inner convex rib 13. There is a certain distance between the first inner convex rib 13 and the first outer convex rib 14, thereby forming a first groove 15.

[0057] like Figure 9-1117. The second sealing body 2 includes a second intermediate plate 21 integrally formed with the electrode frame. The third connector is a second boss 22 located on one side of the second intermediate plate 21. The fourth connector is a second inner rib 23 and a second outer rib 24 located on the other side of the second intermediate plate 21. A second groove 25 is formed between the second inner rib 23 and the second outer rib 24. The second through hole 26 in the middle portion of the second intermediate plate 21 is a common electrolyte flow channel through hole that connects to the flow channel on the electrode frame. The second through hole 26 is circular and is used to circulate electrolyte. The structure of the second boss 22 in this embodiment is the same as that of the first boss 12, and the radial dimensions of the first boss 12 are consistent with those of the second boss 22. The second boss 22 includes a plurality of second arc-shaped protrusions 221 spaced apart in the circumferential direction and perpendicular to the second intermediate plate 21. In this embodiment, the second inner rib 23 includes a plurality of second arcuate inner protrusions 231 spaced circumferentially and perpendicular to the second intermediate plate 21. The second outer rib 24 includes a plurality of second arcuate outer protrusions 241 spaced circumferentially and perpendicular to the second intermediate plate 21. The second arcuate inner protrusions 231 and the second arcuate outer protrusions 241 are preferably arranged one-to-one in a facing relationship, with a discontinuous second groove 25 formed between them. The spaces between the second arcuate inner protrusions 231 form second flow openings 27, and the spaces between the second arcuate outer protrusions 241 form third flow openings 29. The second and third flow openings 27, 29 communicate with the positive or negative electrolyte chambers via flow channels. The first flow opening 122 preferably faces the second and third flow openings 27, 29 to reduce electrolyte flow resistance.

[0058] Due to the existence of the first flow channel opening 122 , the second flow channel opening 27 and the third flow channel opening 29 , the first boss 12 is connected to the flow channel after being inserted into the second groove 25 .

[0059] The axial length of the second connector is 120%-140% of the axial length of the third connector, the axial length of the fourth connector is 120-140% of the axial length of the first connector, and the second connector radially faces the fourth connector.

[0060] In this embodiment, the axial length of the first inner rib 13 and the first outer rib 14 is 120%-140% of the axial length of the second boss 22, preferably 125%-135%. The second boss 22 is inserted into the first groove 15 between the first inner rib 13 and the first outer rib 14. After the stack is assembled, the second inner rib 23 and the second outer rib 24 are squeezed together to form a seal, achieving a good sealing effect. In this embodiment, the axial length of the second inner rib 23 and the second outer rib 24 is 120%-140% of the axial length of the first boss 12, preferably 125%-135%. In this embodiment, the radial dimensions of the second inner rib 23 are consistent with those of the first inner rib 13. After assembly, the second inner rib 23 directly faces the first inner rib 13. The radial dimensions of the second outer rib 24 are consistent with those of the first outer rib 14. After assembly, the second outer rib 24 directly faces the first outer rib 14, ensuring that the second inner rib 23 and the second outer rib 24 provide auxiliary support after the stack is assembled. Preferably, the radial dimensions of the second boss 22 are consistent with those of the first boss 12.

[0061] The second boss 22 can be multi-layered. In the present embodiment, the second boss 22 is a single layer, and the first inner layer convex rib 13 and the first outer layer convex rib 14 matched therewith are also single layers. If the second boss 22 is multi-layered, the first inner layer convex rib 13 and the first outer layer convex rib 14 will also increase the number of layers accordingly; the second inner layer convex rib 23 and the second outer layer convex rib 24 can also be multi-layered. In the present embodiment, the first boss 12 is a single layer, and the second inner layer convex rib 23 and the second outer layer convex rib 24 matched therewith are also single layers. If the first boss 12 is multi-layered, then the second inner layer convex rib 23 and the second outer layer convex rib 24 must also be multi-layered.

[0062] like Figure 16 In the illustrated positive electrode frame, the electrolyte common flow channel through-hole connecting the positive electrolyte inlet i and the positive electrolyte outlet ii is a second through-hole 26. This second through-hole 26 connects to the electrode region 3 via a flow channel 4, where a second sealing body 2 is provided. The electrolyte common flow channel through-hole connecting the negative electrolyte inlet iii and the negative electrolyte outlet iv is a first through-hole 16. This first through-hole 16 is not connected to the electrode region 3 on the positive electrode frame, where a first sealing body 1 is provided. Furthermore, the second inner rib 23, the second outer rib 24, the first inner rib 13, and the first outer rib 14 are located on the same side of the positive electrode frame as the flow channel 4.

[0063] akin, Figure 17In the negative electrode frame shown, the common electrolyte flow channel through-hole connecting the negative electrolyte inlet iii and the negative electrolyte outlet iv is a second through-hole 26. This second through-hole 26 connects to the electrode region 3 via a flow channel 4, where a second sealing body 2 is located. The common electrolyte flow channel through-hole connecting the positive electrolyte inlet i and the positive electrolyte outlet ii is a first through-hole 16. This first through-hole 16 is not connected to the electrode region 3, where a first sealing body 1 is located. Furthermore, the second inner rib 23, the second outer rib 24, the first inner rib 13, and the first outer rib 14 are located on the same side of the negative electrode frame as the flow channel 4.

[0064] The method of using the sealing structure of this embodiment is as follows: Figure 16 The first boss 12 of the first sealing body 1 of the positive electrode frame is inserted into Figure 17 In the second groove 26 between the second arc-shaped inner protrusion 231 and the second arc-shaped outer protrusion 241 of the second sealing body 2 of the negative electrode frame, the first flow channel 122 overlaps with the second flow channel 27 and the third flow channel 29 to form a common flow channel for the electrolyte to communicate with the flow channel 4 on the electrode frame. Figure 16 The second boss 22 of the second sealing body 2 is inserted into Figure 17 The first sealing body 1 is sealed in the first groove 15 shown in the figure. Similarly, the first sealing bodies 1 and the second sealing bodies 2 of the plurality of positive electrode frames and negative electrode frames are continuously connected to form a Figure 3-Figure 5 The same electrolyte common flow channel is shown to have alternating sealing and circulation effects, thereby blocking the negative electrode electrolyte inlet common flow channel 300 and the negative electrode electrolyte outlet common flow channel 400 corresponding to the positive electrode electrolyte chamber and the positive electrode electrolyte inlet common flow channel 100 and the positive electrode electrolyte outlet common flow channel 200 corresponding to the negative electrode electrolyte chamber.

[0065] Figure 5 Shown is a schematic diagram of the first sealing body 1 and the second sealing body 2 between the electrode frames. For the outermost electrode frame on the battery stack, the outer side of the electrode frame is directly connected to the insulating plate. It is divided into two categories: 1. The outer side of the electrode frame is on the side where the flow channel is located, and the insulating plate connected thereto is provided with: a fifth connector and a sixth connector, the fifth connector is plugged and sealed with the second connector, and the sixth connector is connected to the fourth connector and connected to the flow channel. The fifth connector has the same structure as the third connector, and the sixth connector has the same structure as the first connector. 2. The outer side of the electrode frame is on the non-flow channel side, and the first connector and the third connector provided thereon are plugged into the electrolyte common flow channel hole of the insulating plate and cooperate with the electrolyte common flow channel hole, or the outermost first connector and the third connector are omitted, and the side of the electrode frame is directly connected to the insulating plate.

[0066] The common flow channel of the electrode frame adopts the sealing structure of this embodiment to assemble the stack (the outer sides of both electrode frames are plugged into the insulation plate). The internal leakage test is carried out at a pressure of 0.1MPa for 1 hour, and the pressure drop is less than 10%. The external leakage test is carried out at a pressure of 25kPa for 15 minutes, and the pressure drop is less than 10%.

[0067] The sealing structure of this embodiment is made of the same material as the electrode frame, offering excellent stability. Compared to sealing with sealing strips or gaskets, it does not present risks such as aging and creep. Compared to hot-melt adhesive sealing, it is less sensitive to temperature, and changes in the stack's temperature have little effect on the sealing structure. Compared to laser welding sealing, there is no need to purchase a separate laser welding machine, saving costs. The sealing structure offers a simple manufacturing process, low cost, and excellent sealing effect. It only needs to be assembled sequentially with the electrode frame.

[0068] Example 2

[0069] Reference Figure 12 、 13 This embodiment differs from Example 1 in that the structure of the first boss 12 of the first sealing body 1 of this embodiment differs from that of Example 1. In this embodiment, the first boss 12 comprises a first arcuate protrusion 121 and a first circular ring 17 of a certain height. The first arcuate protrusion 121, the first circular ring 17, and the first intermediate plate 11 are integrally formed. The structure of the second boss 22 of the second sealing body 2 of this embodiment also differs from that of Example 1. Similarly, the second boss 22 of this embodiment comprises a second arcuate protrusion 221 and a second circular ring 28 of a certain height. The second arcuate protrusion 221, the second circular ring 28, and the second intermediate plate 21 are also integrally formed. The sealing structure of this embodiment is used in the same manner as in Example 1.

[0070] Example 3

[0071] Reference Figure 14 The difference between this embodiment and embodiments 1 and 2 is that the first boss 22 of the second sealing body 2 of this embodiment is a circular ring with a certain height, which is inserted into the first groove 15 of the first sealing body 1. The sealing structure of this embodiment is used in the same manner as in embodiment 1.

[0072] Example 4

[0073] Reference Figure 15 This embodiment differs from embodiments 1-3 in that the second curved inner protrusion 231 and the second curved outer protrusion 241 of the second sealing body 2 are not directly connected to the second intermediate plate 21, but are connected to the second intermediate plate 21 via a second inner ring 232 and a second outer ring 242 of a certain height. The sealing structure of this embodiment is used in the same manner as in embodiment 1.

[0074] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art will appreciate that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A common flow channel sealing structure for an electrode frame of a liquid flow battery, the liquid flow battery comprising an electrode frame, the electrode frame being provided with a flow channel and a common electrolyte flow channel through-hole; the common electrolyte flow channel through-hole of the electrode frame comprising a first through-hole and a second through-hole; the second through-hole being connected to the flow channel; the first through-hole being not connected to the flow channel; characterized in that: The first sealing body and the second sealing body are connected to the electrode frame. The first sealing body includes a first plug-in connector and a second plug-in connector located on the periphery of the first through hole. The second plug-in connector and the flow channel are located on the same side of the electrode frame, and the first plug-in connector is located on the other side of the electrode frame. The second sealing body includes a third plug-in connector and a fourth plug-in connector located on the periphery of the second through hole. The fourth plug-in connector and the flow channel are located on the same side of the electrode frame, and the third plug-in connector is located on the other side of the electrode frame. The third plug-in connector forms a seal when plugged into the second plug-in connector, and the fourth plug-in connector communicates with the flow channel when plugged into the first plug-in connector.

2. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 1, characterized in that: The first sealing body includes a first intermediate plate that is integrated with the electrode frame, the first plug-in connector is a first boss located on one side of the first intermediate plate, the second plug-in connector is a first inner rib and a first outer rib located on the other side of the first intermediate plate, a first groove for plugging in a third plug-in connector is formed between the first inner rib and the first outer rib, and the middle part of the first intermediate plate is a first through hole.

3. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 1, characterized in that: The second sealing body includes a second intermediate plate integral with the electrode frame, the third plug-in connector is a second boss located on one side of the second intermediate plate, the fourth plug-in connector is a second inner rib and a second outer rib located on the other side of the second intermediate plate, a second groove for plugging in the first plug-in connector is formed between the second inner rib and the second outer rib, and a second through hole is formed in the middle of the second intermediate plate.

4. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 1, characterized in that: The second connector and the third connector are axially arranged along the common flow channel of the electrode frame, and the axial length of the second connector is 120%-140% of the axial length of the third connector.

5. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 1, characterized in that: The first plug-in connector and the fourth plug-in connector are axially arranged along the common flow channel of the electrode frame, and the axial length of the fourth plug-in connector is 120-140% of the axial length of the first plug-in connector.

6. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 1, characterized in that: The second connector is radially opposite to the fourth connector.

7. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 2, characterized in that: The first boss includes a plurality of first arc-shaped protrusions arranged at intervals in the circumferential direction, and the intervals between the first arc-shaped protrusions are first flow channel openings.

8. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 3, characterized in that: The second boss includes a plurality of second arc-shaped protrusions arranged at intervals in the circumferential direction, or the second boss is a ring with a certain height.

9. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 2, characterized in that: The first inner convex rib and the first outer convex rib are both circular rings with a certain height and perpendicular to the first middle plate. The first outer convex rib is located on the outer ring of the first inner convex rib.

10. The common flow channel sealing structure of the electrode frame for a flow battery according to claim 3, characterized in that: The second inner rib includes a plurality of second arc-shaped inner ribs arranged at intervals in the circumferential direction and perpendicular to the second intermediate plate, and the second outer rib includes a plurality of second arc-shaped outer ribs arranged at intervals in the circumferential direction and perpendicular to the second intermediate plate. The intervals between the second arc-shaped inner ribs are the second flow channel openings, and the intervals between the second arc-shaped outer ribs are the third flow channel openings.

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