Mounting frame for flow battery, sealing frame group and flow battery

Abstract

The utility model relates to the field of electrochemical flow batteries, and discloses a mounting frame for a flow battery, a sealing frame group and a flow battery, the mounting frame for the flow battery comprises a frame body, the frame body is provided with a first surface and a second surface which are opposite to each other, and a mounting cavity is formed in the frame body along the direction vertical to the first surface and the second surface in a penetrating manner; the frame body is in an annular shape, an annular protruding strip is arranged on at least one of the first face and the second face, the installation cavity is located on the annular inner side of the annular protruding strip, the annular protruding strip is arranged on the frame body to enhance the extrusion sealing effect between the frame body and the sealing ring, and the annular protruding strip is arranged in an annular shape. The sealing effect can be improved on the annular circle, so that the leakage probability of the electrolyte is reduced.

Description

Technical Field

[0001] The utility model relates to the field of electrochemical flow batteries, in particular to a mounting frame, a sealing frame group and a flow battery for a flow battery. Background Art

[0002] A flow battery is a new type of electrochemical energy storage battery, which is composed of a stack unit, an electrolyte, an electrolyte storage and supply unit, a management and control unit, etc. The flow unit is a high-performance storage battery that separates the positive and negative electrolytes and circulates them separately, and finally realizes ion exchange through an exchange membrane to generate electric energy. Compared with traditional energy storage methods, the flow battery has the characteristics of high capacity, wide application fields, and long cycle service life.

[0003] In the existing flow battery, its housing structure generally includes a positive electrode frame, a negative electrode frame, a diaphragm frame, a positive electrode plate, a negative electrode plate, an exchange membrane and a sealing ring. The sealing ring seals between two frames (the positive electrode frame and the diaphragm frame, the diaphragm frame and the negative electrode frame) to reduce the leakage of the electrolyte.

[0004] In the prior art, the sealing ring is installed by being extruded by the frames on both sides and plays a sealing role. Due to processing errors, thermal expansion and contraction of materials, and installation processes, etc., the sealing effect between the sealing ring and the electrode frame and the diaphragm frame may not meet the sealing requirements, and there is a hidden danger of electrolyte leakage in the flow battery. Summary of the Utility Model

[0005] Aiming at the above-mentioned deficiencies or defects in the prior art, the utility model provides a mounting frame, a sealing frame group and a flow battery for a flow battery. A circular rib is provided on the frame body of the mounting frame to enhance the extrusion effect between the local position of the frame body and the sealing ring, improve the sealing effect of the local position, and reduce the hidden danger of electrolyte leakage.

[0006] To achieve the above object, the utility model provides a mounting frame for a flow battery, including a frame body. The frame body has opposite first and second faces. An installation cavity is formed through the frame body in a direction perpendicular to the first and second faces. The frame body is annular, and a circular rib is provided on at least one of the first and second faces. The installation cavity is located inside the ring of the circular rib.

[0007] In some embodiments, the side of the frame body has side ears, and mounting holes are formed in the side ears.

[0008] In some embodiments, a flow channel and a through hole for the electrolyte to flow are formed in the frame body, and the circular rib has a relief section at the flow channel and the through hole.

[0009] In some embodiments, the avoidance section is located at the edge of the flow channel and the through hole.

[0010] In some embodiments, there are more than two annular ridges provided on the same surface, and the annular ridges on the same surface are distributed in an annular diffusion manner.

[0011] In some embodiments, the cross-section of the outermost annular ridge in the annular direction is rectangular; the cross-section of at least one of the remaining annular ridges in the annular direction is arc-shaped.

[0012] In some embodiments, the annular ridge is integrally formed with the frame body; or the annular ridge is fixedly connected to the frame body.

[0013] The present utility model also provides a sealing frame group, including an elastic annular sealing ring and two installation frames for a flow battery as described above. The annular sealing ring is located between the frame bodies of the two installation frames, and the annular sealing ring abuts and presses against the annular ridges on the frame body.

[0014] In some embodiments, it further includes a shaping strip for fixing the annular sealing ring, and the shaping strip abuts against the edge of the frame body.

[0015] The present utility model also provides a flow battery, including a plurality of groups of the sealing frame groups as described above.

[0016] Applying the above technical solution of the present utility model, an installation frame for a flow battery has the following effects: an annular ridge is provided on the frame body to enhance the extrusion sealing effect between the frame body and the sealing ring. The annular ridge is annularly arranged, and can improve the sealing effect uniformly in a circle, thereby reducing the leakage probability of the electrolyte.

[0017] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a three-dimensional structural schematic diagram of an installation frame for a flow battery according to an embodiment of the present utility model;

[0019] Figure 2 is Figure 1 the front view schematic diagram of

[0020] Figure 3 is the front view schematic diagram of the annular sealing ring;

[0021] Figure 4 is the side sectional view schematic diagram of a sealing frame group according to an embodiment of the present utility model.

[0022] DESCRIPTION OF THE REFERENCE NUMERALS

[0023] 1. Installation frame; 11. Frame body; 11a. First surface; 11b. Second surface; 11c. Installation cavity; 12. Annular ridge; 12a. First annular ridge; 12b. Second annular ridge; 13. Flow channel; 14. Through hole; 15. Avoidance section; 16. Side ear; 17. Installation hole; 2. Sealing frame assembly; 21. Annular sealing ring; 1a. First installation frame; 1b. Second installation frame; 3. Molding strip. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0025] As attached Figure 1 , Attachment Figure 2 As shown, the utility model discloses a mounting frame 1 for a liquid flow battery, comprising a frame body 11, wherein the frame body 11 has a first surface 11a and a second surface 11b opposite to each other, and a mounting cavity 11c is provided through the frame body 11 in a direction perpendicular to the first surface 11a and the second surface 11b, so that the entire frame body 11 is in a ring shape. An annular convex strip 12 is provided on at least one of the first surface 11a and the second surface 11b, and the mounting cavity 11c is located on the inner side of the annular convex strip 12.

[0026] The mounting frame 1 is suitable for mounting the positive electrode, negative electrode and ion exchange membrane in the flow battery. That is, the mounting cavity 11c can be used to mount the positive electrode plate, the negative electrode plate or the ion exchange membrane. Generally, the mounting frame 1 for mounting the ion exchange membrane is located between the mounting frame 1 for mounting the positive electrode and the mounting frame 1 for mounting the negative electrode. For ease of explanation, the mounting frame 1 for mounting the ion exchange membrane is called a diaphragm frame, the mounting frame 1 for mounting the positive electrode is called a positive electrode frame, and the mounting frame 1 for mounting the negative electrode is called a negative electrode frame.

[0027] A sealing ring needs to be provided between the diaphragm frame and the positive electrode frame and the negative electrode frame. The sealing ring between the diaphragm frame and the positive electrode frame is used as an example for explanation. Specifically, the sealing ring is clamped by the diaphragm frame and the positive electrode frame to reduce the leakage of the positive ion electrolyte. The greater the clamping force of the diaphragm frame and the positive electrode frame on the sealing ring, the better the sealing effect, but the diaphragm frame and the positive electrode frame are also more likely to deform.

[0028] Assumption: The critical deformation force of the diaphragm frame and the positive electrode frame is F 0 (That is, when the force is greater than F 0 When the clamping force of the diaphragm frame and the positive electrode frame on the sealing ring is F, the sealing effect is Q(F). Among them, Q(F) is a positive correlation function of the clamping force F of the sealing ring, and the value range of F is (0, F0 )。

[0029] When the clamping force of the diaphragm frame and the positive electrode frame on the sealing ring is F 0 , the sealing effect is Q(F 0 ). In this embodiment, due to the arrangement of the annular rib 12, the deformation at the contact between the sealing ring and the annular rib 12 is greater than the deformation at other contact positions between the sealing ring and the frame body 11. That is, the clamping force on the sealing ring at the annular rib 12 is greater than F 0 , and the sealing effect is greater than Q(F 0 ).

[0030] In addition, the installation cavity 11c is located inside the ring of the annular rib 12. That is: the arrangement of the entire ring of the annular rib 12 makes the leakage path of the electrolyte must pass through the annular rib 12, thereby ensuring that the anti-leakage effect of the electrolyte can be improved.

[0031] It should be noted that in actual application, the clamping force of the diaphragm frame and the positive electrode frame on the sealing ring will not reach the limit F 0 to ensure the reliability of the use of the installation frame 1. In actual application, the clamping force of the diaphragm frame and the positive electrode frame on the sealing ring is F 1 , where: 0 < F 1 < F 0 . The clamping force on the sealing ring at the annular rib 12 is F 2 , and of course, the protruding thickness of the annular rib 12 also needs to be reasonably set according to factors such as the material of the sealing ring to ensure F 2 < F 0 , so that: 0 < F 1 < F 2 < F 0 to avoid deformation of the installation frame 1.

[0032] In summary, on the premise of the same clamping force of the diaphragm frame and the positive electrode frame, the arrangement of the annular rib 12 can improve the sealing effect of the sealing ring. In addition, the diaphragm frame is arranged between the positive electrode frame and the negative electrode frame. Therefore, annular ribs 12 are arranged on both the first surface 11a and the second surface 11b of the installation frame 1 as the diaphragm frame, and annular ribs 12 only need to be arranged on the side surfaces of the positive electrode frame and the negative electrode frame facing the diaphragm frame.

[0033] In a further setting, the side of the frame body 11 has side ears 16, and mounting holes 17 are provided in the side ears 16. The arrangement of the side ears 16 and the mounting holes 17 facilitates the penetration of adjacent frame bodies 11 by fasteners such as bolts, so as to facilitate the fastening connection of adjacent frame bodies 11, and also facilitates the adjustment of the clamping force of adjacent frame bodies 11 on the sealing ring to meet the use requirements.

[0034] In a further setting, a flow channel 13 for the electrolyte to flow through and a through hole 14 are provided on the frame body 11. The annular rib 12 has a relief section 15 at both the flow channel 13 and the through hole 14, so that the annular rib 12 avoids the flow channel 13 and the through hole 14, preventing obstruction to the flow of the electrolyte. Specifically, as the mounting frame 1 for the positive electrode frame and the negative electrode frame, the flow channel 13 and the through hole 14 need to be opened to allow the flow of positive ion electrolyte and negative ion electrolyte, while the separator frame does not need to be provided with the flow channel 13 and the through hole 14. Therefore, in actual application, it is not necessary to provide the relief section 15 for all the annular ribs 12 on the frame body 11. It is only necessary to provide the relief section 15 for the annular ribs 12 on the frame body 11 that serve as the positive electrode frame and the negative electrode frame.

[0035] For the relief section 15, it is provided at the edges of the flow channel 13 and the through hole 14. Specifically, the relief section 15 is essentially a part of the annular rib 12, which can enhance the anti-leakage effect of the electrolyte after being extruded and abutted against the sealing ring. Setting the relief section 15 at the edges of the flow channel 13 and the through hole 14 not only does not interfere with the flow of the electrolyte, but also improves the anti-leakage effect at the flow channel 13 and the through hole 14.

[0036] In a further setting, two or more annular ribs 12 are provided on the same surface, and the annular ribs 12 on the same surface are distributed in an annular diffusion manner. In this embodiment, taking the example of providing two annular ribs 12 on the first surface 11a, the two annular ribs 12 are respectively called the first annular rib 12a and the second annular rib 12b. Among them, the installation cavity 11c is located inside the ring of the second annular rib 12b, and the second annular rib 12b is located inside the ring of the first annular rib 12a, so that the first annular rib 12a and the second annular rib 12b are distributed in an annular diffusion manner. Two or more annular ribs 12 can further improve the sealing effect.

[0037] In addition, the cross-section of the outermost annular rib 12 in the annular direction is rectangular, and the cross-section of at least one of the remaining annular ribs 12 in the annular direction is arc-shaped. The annular rib 12 with a rectangular cross-section can reduce the stress concentration of extrusion between the annular rib 12 and the sealing ring; the annular rib 12 with an arc-shaped cross-section has a better sealing effect after being extruded and abutted against the sealing ring.

[0038] The annular rib 12 can be integrally formed with the frame body 11, which is simple and convenient for production. In other embodiments, the annular rib 12 is fixedly connected to the frame body 11. Before connecting the annular rib 12 to the frame body 11, the installation position of the annular rib 12 and the frame body 11 can be determined according to actual application requirements, and the application scenarios are more flexible and changeable.

[0039] The present utility model also provides a sealing frame group 2, which includes an elastic annular sealing ring 21 and two installation frames 1 for flow batteries as described above. Specifically, the two installation frames 1 are respectively referred to as a first installation frame 1a and a second installation frame 1b. The annular sealing ring 21 is located between the first installation frame 1a and the second installation frame 1b, and the annular sealing ring 21 abuts and is extruded against the annular rib 12 on the frame body 11. Combined with the attached Figure 3 , the front view section of the annular sealing ring 21 matches the front view section of the frame body 11, and spaces for the electrolyte to flow need to be left at the positions of the annular sealing ring 21 facing the flow channels 13 and through holes 14 on the frame body 11. Combined with the attached Figure 4 , in this embodiment, the connection between the positive electrode frame and the separator frame in the sealing frame group 2 is taken as an example for illustration. Among them, the first installation frame 1a on the left is the positive electrode frame, and the second installation frame 1b on the right is the separator frame. The first annular rib 12a and the second annular rib 12b are provided on the first surface 11a of the first installation frame 1a, and the first annular rib 12a and the second annular rib 12b are provided on both the first surface 11a and the second surface 11b of the second installation frame 1b.

[0040] In a further setting, the sealing frame group 2 further includes a shaping strip 3, and the shaping strip 3 fixes the annular sealing ring 21 and plays a role in shaping the annular sealing ring 21. When the annular sealing ring 21 is installed between the two installation frames 1, the shaping strip 3 abuts against the edge of the frame body 11 to improve the connection reliability between the annular sealing ring 21 and the two installation frames 1.

[0041] It should be noted that, in this embodiment, the shaping strip 3 is disconnected at the side ear 16 of the frame body 11 to avoid the side ear 16.

[0042] The present utility model also provides a flow battery, which includes the sealing frame group 2 as described above. In actual application, several groups of the above-mentioned sealing frame groups 2 can be adopted according to requirements.

[0043] The above are only the embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural or equivalent process transformation made by using the description and drawings of the present utility model, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A mounting frame for a flow battery, characterized in that: The invention comprises a frame (11), wherein the frame (11) has a first surface (11a) and a second surface (11b) opposite to each other, and an installation cavity (11c) is provided in the frame (11) in a direction perpendicular to the first surface (11a) and the second surface (11b). The frame (11) is in a ring shape, and an annular convex strip (12) is provided on at least one of the first surface (11a) and the second surface (11b), and the installation cavity (11c) is located on the inner side of the ring shape of the annular convex strip (12).

2. The mounting frame for a flow battery according to claim 1, characterized in that: The frame (11) has a side ear (16) on its side, and a mounting hole (17) is provided in the side ear (16).

3. The mounting frame for a flow battery according to claim 1, characterized in that: The frame (11) is provided with a flow channel (13) and a through hole (14) for the flow of electrolyte, and the annular convex strip (12) has an avoidance section (15) at the flow channel (13) and the through hole (14).

4. The mounting frame for a flow battery according to claim 3, characterized in that: The avoidance section (15) is located at the edge of the flow channel (13) and the through hole (14).

5. The mounting frame for a flow battery according to claim 1, characterized in that: More than two annular convex strips (12) are provided on the same surface, and the annular convex strips (12) on the same surface are distributed in an annular diffusion manner.

6. The mounting frame for a flow battery according to claim 5, characterized in that: The cross section of the outermost annular convex strip (12) in the annular direction is rectangular; the cross section of at least one of the remaining annular convex strips (12) in the annular direction is arc-shaped.

7. The mounting frame for a flow battery according to any one of claims 1 to 6, characterized in that: The annular convex strip (12) and the frame (11) are integrally formed; or The annular convex strip (12) is fixedly connected to the frame (11).

8. A sealing frame assembly, characterized in that: It comprises an elastic annular sealing ring (21) and two installation frames for a liquid flow battery as claimed in any one of claims 1 to 7, wherein the annular sealing ring (21) is located between the frame bodies (11) of the two installation frames and the annular sealing ring (21) is abutted and squeezed against the annular convex strip (12) on the frame body (11).

9. The sealing frame assembly according to claim 8, characterized in that: It also comprises a shaping strip (3) for fixing the annular sealing ring (21), wherein the shaping strip (3) abuts against the edge of the frame (11).

10. A liquid flow battery, characterized in that: It comprises several groups of sealing frame groups as described in claim 8 or 9.

Images