Flow battery

Abstract

Provided in the present application is a flow battery. In the flow battery, the opposite sides of any adjacent frames are provided with a main engagement protruding portion, a main engagement recessed portion, a first electrolyte inlet channel, a first electrolyte outlet channel, a second electrolyte inlet channel and a second electrolyte outlet channel, wherein the main engagement protruding portion engages with the main engagement recessed portion to form a main sealing engagement path; the first electrolyte inlet channel, a first cavity and the first electrolyte outlet channel are in communication with one another; the second electrolyte inlet channel, a second cavity and the second electrolyte outlet channel are in communication with one another; and at least one of the first electrolyte inlet channel, the first electrolyte outlet channel, the second electrolyte inlet channel and the second electrolyte outlet channel is separated by means of the main sealing engagement path. Between adjacent frames, at least one of the first electrolyte inlet channel, the first electrolyte outlet channel, the second electrolyte inlet channel and the second electrolyte outlet channel is separated by means of the main sealing engagement path, thereby providing advantages such as simple production processes, low production costs and good sealing effects.

Description

A flow battery Technical Field

[0001] The present application relates to but is not limited to the technical field of battery stack equipment, and specifically refers to a liquid flow battery. Background Art

[0002] As an essential component of the emerging clean energy industry, flow batteries serve as a crucial bridge between the power grid and end users in the photovoltaic and wind energy sectors. Flow batteries store electricity from the grid and deliver it to end users, making their stability, safety, energy conversion efficiency, and storage capacity key areas of ongoing research and development for battery manufacturers.

[0003] The liquid passages for circulating electrolyte in existing flow batteries are sealed with sealing rings or sealants. These two sealing methods have problems such as complex production processes and high costs.

[0004] Summary of the Invention

[0005] The present application provides a liquid flow battery, wherein the production process of the liquid flow channel for circulating electrolyte is simple and the cost is low, and the sealing effect of the liquid flow channel is good.

[0006] The flow battery provided by an embodiment of the present invention comprises a plurality of subunits arranged in sequence, each of the subunits comprising a first electrode having a first cavity, a second electrode having a second cavity, a frame, a separator and a proton exchange membrane, the proton exchange membrane being arranged at the inner hole of the frame, the first electrode being located on the first side of the proton exchange membrane, the second electrode being located on the second side of the proton exchange membrane, and the separator being arranged on the side of one of the first electrode and the second electrode facing away from the other of the first electrode and the second electrode; wherein the first electrode and the second electrode on opposite sides of any adjacent subunits are The electrodes are separated by the partition plate, and the opposite sides of any adjacent frames are provided with a main matching protrusion, a main matching recess, a first liquid inlet channel, a first liquid outlet channel, a second liquid inlet channel and a second liquid outlet channel. The main matching protrusion and the main matching recess cooperate to form a main sealing matching circuit, the first liquid inlet channel, the first cavity and the first liquid outlet channel are connected, the second liquid inlet channel, the second cavity and the second liquid outlet channel are connected, and at least one of the first liquid inlet channel, the first liquid outlet channel, the second liquid inlet channel and the second liquid outlet channel is separated by the main sealing matching circuit.

[0007] In some exemplary embodiments, the main mating protrusion includes a first main mating protrusion, a second main mating protrusion, a third main mating protrusion and a fourth main mating protrusion, and the main mating recess includes a first main mating recess, a second main mating recess, a third main mating recess and a fourth main mating recess. The first main mating protrusion and the first main mating recess cooperate to form a first main sealing mating circuit, the second main mating protrusion and the second main mating recess cooperate to form a second main sealing mating circuit, the third main mating protrusion and the third main mating recess cooperate to form a third main sealing mating circuit, and the fourth main mating protrusion and the fourth main mating recess cooperate to form a fourth main sealing mating circuit. The first liquid inlet channel is separated by the first main sealing mating circuit, the first liquid outlet channel is separated by the second main sealing mating circuit, the second liquid inlet channel is separated by the third main sealing mating circuit, and the second liquid outlet channel is separated by the fourth main sealing mating circuit.

[0008] In some exemplary embodiments, the first main mating recess, the second main mating recess, the third main mating recess and the fourth main mating recess are located on the first side of the frame body, and the first main mating protrusion, the second main mating protrusion, the third main mating protrusion and the fourth main mating protrusion are located on the second side of the frame body.

[0009] In some exemplary embodiments, a flow balancing structure is provided between the first liquid inlet channel and the first cavity.

[0010] In some exemplary embodiments, a flow balancing structure is provided between the first cavity and the first liquid outlet channel.

[0011] In some exemplary embodiments, a flow balancing structure is provided between the second liquid inlet channel and the second cavity.

[0012] In some exemplary embodiments, a flow balancing structure is provided between the second cavity and the second liquid outlet channel.

[0013] In some exemplary embodiments, a secondary mating protrusion and a secondary mating recess are further provided on the opposite sides of any adjacent frames, and the secondary mating protrusion and the secondary mating recess cooperate to form an annular secondary sealing mating circuit, and the main mating protrusion, the main mating recess, the first liquid inlet channel, the first liquid outlet channel, the second liquid inlet channel, the second liquid outlet channel, the first electrode and the second electrode are all located on the inner side of the area enclosed by the secondary sealing mating circuit.

[0014] In some exemplary embodiments, the liquid flow battery further includes: a first insulating plate and a second insulating plate, the first insulating plate being located on the first side of the second insulating plate, the plurality of subunits being located between the first insulating plate and the second insulating plate, a first liquid inlet channel, a first liquid outlet channel, a main mating protrusion, a main mating recess, a secondary mating protrusion and a secondary mating recess being provided between the first insulating plate and the adjacent frame, and a second liquid inlet channel, a second liquid outlet channel, a main mating protrusion, a main mating recess, a secondary mating protrusion and a secondary mating recess being provided between the second insulating plate and the adjacent frame.

[0015] In some exemplary embodiments, the main mating protrusion has a height of 4 mm to 12 mm and a width of 1.5 mm to 3 mm, and the main mating recess has a depth of 4 mm to 12 mm and a width of 2 mm to 3.5 mm.

[0016] In some exemplary embodiments, the height of the auxiliary mating protrusion is 4 mm to 12 mm and the width is 1.5 mm to 3 mm, and the depth of the auxiliary mating recess is 4 mm to 12 mm and the width is 2 mm to 3.5 mm.

[0017] In some exemplary embodiments, the frame includes a first frame and a second frame, one of the first frame and the second frame is provided with a positioning recess and the other is provided with a positioning protrusion, one of the first frame and the second frame is further provided with an annular sealing rib, the positioning protrusion is placed in the positioning recess, the sealing rib presses the periphery of the proton exchange membrane to the other of the first frame and the second frame, the main matching recess and the main matching protrusion are located outside the area enclosed by the second frame and on the first frame, and the partition plate is provided on the side of the second frame facing away from the first frame.

[0018] In some exemplary embodiments, a corner of the second frame is provided with an elastic deformation structure, and the elastic deformation structure is used to adjust the size of the second frame.

[0019] In some exemplary embodiments, the height of the positioning protrusion is 1.5 mm to 3.5 mm and the width is 1.5 mm to 3 mm, and the depth of the positioning concave is 1.5 mm to 3.5 mm and the width is 2 mm to 3.5 mm.

[0020] According to the technical solution proposed in the embodiment of the present invention, the first electrode and the second electrode on the opposite sides of any adjacent sub-units are separated by a partition plate to prevent the first electrodes and the second electrodes on the opposite sides of the adjacent sub-units from short-circuiting. The main matching protrusion and the main matching recess cooperate to form a main sealing matching circuit. Since the main sealing matching circuit has a good sealing effect, a simple production process, and a low production cost, at least one of the first liquid inlet channel, the first liquid outlet channel, the second liquid inlet channel, and the second liquid outlet channel separated between adjacent frames by the main sealing matching circuit has the advantages of a simple production process, low production cost, and a good sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic diagram of the exploded structure of a flow battery provided by some embodiments;

[0022] FIG2 is a partial schematic diagram of the exploded structure of the flow battery shown in FIG1 ;

[0023] FIG3 is a schematic diagram of the decomposed structure of the subunit in FIG1 ;

[0024] FIG4 is a schematic diagram of the three-dimensional structure of the first frame in FIG1 ;

[0025] FIG5 is a schematic cross-sectional view of the structure of the assembled multiple subunits in FIG1 ;

[0026] FIG6 is an enlarged structural diagram of portion A in FIG5 ;

[0027] FIG7 is a schematic diagram of the main structure of the second frame in FIG1 ;

[0028] FIG8 is a schematic diagram of the rear structural view of the second frame in FIG1 ;

[0029] FIG9 is a schematic front structural view of an example of the first end plate or the second end plate in FIG1 ;

[0030] FIG10 is a schematic front view of another example of the first end plate or the second end plate in FIG1 , wherein reinforcing ribs are added to the first end plate or the second end plate;

[0031] FIG11 is an enlarged structural diagram of portion B in FIG5 .

[0032] The corresponding relationship between the reference numerals and the component names is as follows: 100 first electrode, 200 second electrode, 310 first frame, 311 positioning recess, 320 second frame, 321 positioning protrusion, 322 elastic deformation structure, 323 sealing rib, 400 partition plate, 500 proton exchange membrane, 600 protective membrane, 710 first liquid inlet channel, 711 first liquid inlet through hole, 720 first liquid outlet channel, 721 first liquid outlet through hole, 730 second liquid inlet channel, 731 second liquid inlet through hole, 740 second liquid outlet channel, 741 second liquid outlet through hole, 750 first main matching protrusion, 751 first main matching recess, 752 first main sealing matching circuit, 7 60 second main mating protrusion, 761 second main mating recess, 762 second main sealing mating circuit, 770 third main mating protrusion, 771 third main mating recess, 772 third main sealing mating circuit, 780 fourth main mating protrusion, 781 fourth main mating recess, 782 fourth main sealing mating circuit, 790 current sharing structure, 810 secondary mating protrusion, 820 secondary mating recess, 830 secondary sealing mating circuit, 910 first insulating plate, 920 second insulating plate, 930 first end plate, 940 second end plate, 950 first power supply plate, 960 second power supply plate, 970 screw, 980 spring. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In addition, the terms "first," "second," and so on, used in this disclosure are 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 referenced. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this disclosure, "plurality" means at least two, such as two or three, unless otherwise specifically defined.

[0036] In the present invention, unless otherwise specified or limited, the terms "connect," "fix," etc. should be understood in a broad sense. For example, "fix" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection or electrical connection; "connect" can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] As shown in Figures 1 to 10, the flow battery provided by the embodiment of the present invention includes a plurality of subunits arranged in sequence, each subunit including a first electrode 100 having a first cavity, a second electrode 200 having a second cavity, a frame, a separator 400 and a proton exchange membrane 500, the proton exchange membrane 500 is provided at the inner hole of the frame, the first electrode 100 is located on the first side of the proton exchange membrane 500, the second electrode 200 is located on the second side of the proton exchange membrane 500, and the separator 400 is provided on the side of one of the first electrode 100 and the second electrode 200 facing away from the other of the first electrode 100 and the second electrode 200; wherein, the first electrodes on opposite sides of any adjacent subunits 100 and the second electrode 200 are separated by a partition plate 400, and the opposite sides of any adjacent frames are provided with a main matching protrusion, a main matching recess, a first liquid inlet channel 710, a first liquid outlet channel 720, a second liquid inlet channel 730 and a second liquid outlet channel 740, the main matching protrusion and the main matching recess cooperate to form a main sealing matching circuit, the first liquid inlet channel 710, the first cavity and the first liquid outlet channel 720 are connected, the second liquid inlet channel 730, the second cavity and the second liquid outlet channel 740 are connected, and at least one of the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730 and the second liquid outlet channel 740 is separated by the main sealing matching circuit.

[0039] In this liquid flow battery, the first electrode 100 and the second electrode 200 on the opposite sides of any adjacent subunits are separated by a partition plate 400. The partition plate 400 is used to prevent the first electrode 100 and the second electrode 200 on the opposite sides of adjacent subunits from short-circuiting. The main matching protrusion and the main matching recess cooperate to form a main sealing matching circuit. Since the main sealing matching circuit has a good sealing effect, a simple production process, and a low production cost, at least one of the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730, and the second liquid outlet channel 740 separated between adjacent frames by the main sealing matching circuit has the advantages of a simple production process, a low production cost, and a good sealing effect.

[0040] In some exemplary embodiments, as shown in Figures 4 and 5, the main mating protrusion includes a first main mating protrusion 750, a second main mating protrusion 760, a third main mating protrusion 770 and a fourth main mating protrusion 780, and the main mating recess includes a first main mating recess 751, a second main mating recess 761, a third main mating recess 771 and a fourth main mating recess 781. The first main mating protrusion 750 and the first main mating recess 751 cooperate to form a first main sealing mating line 752, the second main mating protrusion 760 and the second main mating recess 761 cooperate to form a second main sealing mating line 762, the third main mating protrusion 770 and the third main mating recess 771 cooperate to form a third main sealing mating line 772, and the fourth main mating protrusion 780 and the fourth main mating recess 781 cooperate to form a third main sealing mating line 772. Cooperating to form a fourth main seal matching circuit 782, the first liquid inlet channel 710 is separated by the first main seal matching circuit 752 (that is, the first main seal matching circuit 752 separates the first liquid inlet channel 710 between adjacent frames), the first liquid outlet channel 720 is separated by the second main seal matching circuit 762 (that is, the second main seal matching circuit 762 separates the first liquid outlet channel 720 between adjacent frames), the second liquid inlet channel 730 is separated by the third main seal matching circuit 772 (that is, the third main seal matching circuit 772 separates the second liquid inlet channel 730 between adjacent frames), and the second liquid outlet channel 740 is separated by the fourth main seal matching circuit 782 (that is, the fourth main seal matching circuit 782 separates the second liquid outlet channel 740 between adjacent frames).

[0041] Alternatively, the main mating protrusion includes any one of the first main mating protrusion 750, the second main mating protrusion 760, the third main mating protrusion 770 and the fourth main mating protrusion 780, and the main mating recess includes one of the first main mating recess 751, the second main mating recess 761, the third main mating recess 771 and the fourth main mating recess 781. In this case, the main sealing mating line formed by the main mating protrusion and the main mating recess only separates one of the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730 and the second liquid outlet channel 740; or the main mating protrusion includes any two of the first main mating protrusion 750, the second main mating protrusion 760, the third main mating protrusion 770 and the fourth main mating protrusion 780, and the main mating recess includes two of the first main mating recess 751, the second main mating recess 761, the third main mating recess 771 and the fourth main mating recess 781. In this case, The main sealing matching circuit formed by the cooperation of the main matching protrusion and the main matching recess only separates two of the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730 and the second liquid outlet channel 740; or it may be that the main matching protrusion includes any three of the first main matching protrusion 750, the second main matching protrusion 760, the third main matching protrusion 770 and the fourth main matching protrusion 780, and the main matching recess includes three of the first main matching recess 751, the second main matching recess 761, the third main matching recess 771 and the fourth main matching recess 781. At this time, the main sealing matching circuit formed by the cooperation of the main matching protrusion and the main matching recess only separates three of the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730 and the second liquid outlet channel 740; the above can all achieve the purpose of this application, and its purpose does not deviate from the design concept of the present invention. It will not be repeated here and should all fall within the protection scope of this application.

[0042] In one embodiment, as shown in FIG4 , the first primary mating recess 751, the second primary mating recess 761, the third primary mating recess 771, and the fourth primary mating recess 781 are located on a first side (e.g., the left side) of the frame, and the first primary mating protrusion 750, the second primary mating protrusion 760, the third primary mating protrusion 770, and the fourth primary mating protrusion 780 are located on a second side (e.g., the right side) of the frame. The frame is configured as a plastic part, and the first primary mating recess 751, the second primary mating recess 761, the third primary mating recess 771, the fourth primary mating recess 781, the first primary mating protrusion 750, the second primary mating protrusion 760, the third primary mating protrusion 770, and the fourth primary mating protrusion 780 are manufactured using an injection molding process, which is simple in process and high in precision.

[0043] Among them, if the first electrode 100 is a positive electrode and the second electrode 200 is a negative electrode, the electrolyte flowing through the first cavity is a positive electrode electrolyte, and the electrolyte flowing through the second cavity is a negative electrode electrolyte; if the second electrode 200 is a positive electrode and the first electrode 100 is a negative electrode, the electrolyte flowing through the second cavity is a positive electrode electrolyte, and the electrolyte flowing through the first cavity is a negative electrode electrolyte.

[0044] In one embodiment, as shown in Figures 4 and 8, a flow balancing structure 790 is provided between the first liquid inlet channel 710 and the first cavity, a flow balancing structure 790 is provided between the first cavity and the first liquid outlet channel 720, a flow balancing structure 790 is provided between the second liquid inlet channel 730 and the second cavity, and a flow balancing structure 790 is provided between the second cavity and the second liquid outlet channel 740, to ensure that the flow rate of the electrolyte entering each first cavity remains consistent, and to ensure that the flow rate of the electrolyte entering each second cavity remains consistent. If the first electrode 100 is a positive electrode and the second electrode 200 is a negative electrode, the electrolyte entering the first cavity is the positive electrode electrolyte, and the electrolyte entering the second cavity is the negative electrode electrolyte; if the second electrode 200 is a positive electrode and the first electrode 100 is a negative electrode, the electrolyte entering the second cavity is the positive electrode electrolyte, and the electrolyte entering the first cavity is the negative electrode electrolyte.

[0045] The length of the flow-sharing structure 790 is set to 40 mm to 80 mm, and the width is set to 5 mm to 20 mm.

[0046] In some examples, as shown in FIG4 , a secondary mating protrusion 810 and a secondary mating recess 820 are further provided on opposite sides of any adjacent frames. The secondary mating protrusion 810 and the secondary mating recess 820 cooperate to form an annular secondary sealing mating circuit 830. The primary mating protrusion, the primary mating recess, the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730, the second liquid outlet channel 740, the first electrode 100 and the second electrode 200 are all located inside the area enclosed by the secondary sealing mating circuit 830. The secondary sealing mating circuit 830 forms a second seal to prevent the flow battery from leaking electrolyte when electrolyte leaks from the first liquid inlet channel 710, the first liquid outlet channel 720, the second liquid inlet channel 730 and the second liquid outlet channel 740.

[0047] In some examples, as shown in Figures 1 and 2, the flow battery further includes: a first insulating plate 910 and a second insulating plate 920, wherein the first insulating plate 910 is located on a first side of the second insulating plate 920, and the plurality of subunits are located between the first insulating plate 910 and the second insulating plate 920. A first liquid inlet channel 710, a first liquid outlet channel 720, a primary mating protrusion, a primary mating recess, a secondary mating protrusion 810, and a secondary mating recess 820 are also provided between the first insulating plate 910 and the adjacent frame. A primary sealing mating line (formed by the mating of the primary mating protrusion and the primary mating recess) separates the first liquid inlet channel 710 and the first liquid outlet channel 720. A second liquid inlet channel 730, a second liquid outlet channel 740, a primary mating protrusion, a primary mating recess, a secondary mating protrusion 810, and a secondary mating recess 820 are also provided between the second insulating plate 920 and the adjacent frame. A primary sealing mating circuit (formed by the primary mating protrusion and the primary mating recess) separates the second liquid inlet channel 730 and the second liquid outlet channel 740. A first power extraction plate 950 is provided between the first insulating plate 910 and the multiple subunits, and a second power extraction plate 960 is provided between the second insulating plate 920 and the multiple subunits.

[0048] As shown in Figure 4, the first liquid inlet channel 710 and the second liquid inlet channel 730 are both located at the lower part of the frame, and the lower part of the frame is also provided with a first liquid inlet through hole 711 and a second liquid inlet through hole 731. The first liquid inlet through hole 711 is connected to the inlet of the first liquid inlet channel 710, and the second liquid inlet through hole 731 is connected to the inlet of the second liquid inlet channel 730. The first liquid outlet channel 720 and the second liquid outlet channel 740 are both located at the upper part of the frame, and the upper part of the frame is also provided with a first liquid outlet through hole 721 and a second liquid outlet through hole 741. The first liquid outlet channel 720 is connected to the outlet of the first liquid outlet channel 720, and the second liquid outlet channel 740 is connected to the outlet of the second liquid outlet channel 740.

[0049] As shown in Figure 4, the first liquid inlet channel 710, the second liquid inlet channel 730, the first liquid outlet channel 720 and the second liquid outlet channel 740 are all curved structures, and their lengths are all set to 1000mm to 2300mm. The length of the secondary sealing matching line 830 is set to 8000mm to 20000mm.

[0050] The height of the main mating protrusion is 4mm~12mm and the width is 1.5mm~3mm. The depth of the main mating recess is 4mm~12mm and the width is 2mm~3.5mm. The end face of the main mating protrusion is against the inner end face of the main mating recess to achieve a press-fit seal.

[0051] The height of the auxiliary mating protrusion 810 is 4mm~12mm and the width is 1.5mm~3mm. The depth of the auxiliary mating recess 820 is 4mm~12mm and the width is 2mm~3.5mm. The end face of the auxiliary mating protrusion 810 is against the inner end face of the auxiliary mating recess 820 to achieve a press-fit seal.

[0052] The height dimension of the inner hole of the frame in the vertical direction is 200mm~500mm, the length dimension of the inner hole of the frame in the horizontal direction is 500mm~900mm, the height dimension of the first electrode 100 and the second electrode 200 in the vertical direction is 200mm~500mm, the length dimension of the first electrode 100 and the second electrode 200 in the horizontal direction is 500mm~900mm, the height dimension of the proton exchange membrane 500 in the vertical direction is 230mm~530mm, the length dimension of the proton exchange membrane 500 in the horizontal direction is 550mm~950mm, the separator 400 is a bipolar plate, the height dimension of the bipolar plate in the vertical direction is 230mm~530mm, and the length dimension of the bipolar plate in the horizontal direction is 550mm~950mm.

[0053] As shown in FIG. 1 to FIG. 3 , a protective film 600 is provided around the two side surfaces of the bipolar plate, and the width of the protective film 600 is set to 20 mm to 60 mm.

[0054] Furthermore, as shown in Figures 1, 2, 9 and 10, the liquid flow battery also includes a first end plate 930 and a second end plate 940 located outside the first insulating plate 910 and the second insulating plate 920. After the first end plate 930, the first insulating plate 910, multiple sub-units, the second insulating plate 920 and the second end plate 940 are assembled, multiple screws 970 are passed through the periphery, and a spring 980 is mounted on each screw 970 for elastic connection.

[0055] In some examples, as shown in Figures 1 to 7, 8 and 11, the frame includes a first frame 310 and a second frame 320. The inner hole of the first frame 310 and the inner hole of the second frame 320 are set to the same size. The height dimension of the first frame 310 in the vertical direction is greater than the height dimension of the second frame 320 in the vertical direction. One of the first frame 310 and the second frame 320 is provided with an annular positioning recess 311 and the other is provided with an annular positioning protrusion 321. The positioning protrusion 321 is placed in the positioning recess 311. 11 to position the first frame 310 and the second frame 320. The side of the second frame 320 facing the first frame 310 is further provided with an annular sealing rib 323 (as shown in Figures 5 and 11). The sealing rib 323 is located inside the area enclosed by the positioning protrusion 321. The sealing rib 323 presses the periphery of the proton exchange membrane 500 against the side of the first frame 310 facing the second frame 320 and is sealed and fixed. The periphery of the proton exchange membrane 500 acts as a seal between the sealing rib 323 and the first frame 310. The main matching recess and the main matching protrusion are located outside the area enclosed by the second frame 320 and on the first frame 310. The partition plate 400 is provided on the side of the second frame 320 facing away from the first frame 310. Two current balancing structures 790 are provided on the upper part of the side of the first frame body 310 facing away from the second frame body 320, and two current balancing structures 790 are provided on the lower part. Two current balancing structures 790 are provided on the upper part of the side of the second frame body 320 facing away from the first frame body 310, and two current balancing structures 790 are provided on the lower part.

[0056] In some embodiments, the height of the positioning protrusion 321 is 1.5mm to 3.5mm and the width is 1.5mm to 3mm. The sealing rib 323 is 0.1mm to 0.5mm in height and 1.5mm to 4mm in width. The depth of the positioning recess 311 is 1.5mm to 3.5mm and the width is 2mm to 3.5mm. The positioning protrusion 321 and the positioning recess 311 are assembled together to pre-position the first frame 310 and the second frame 320. The sealing rib 323 presses the periphery of the proton exchange membrane 500 on the side of the first frame 310 facing the second frame 320 to seal and fix the proton exchange membrane 500. Of course, the sealing rib can also be provided on the first frame to achieve the purpose of this application. Its purpose does not deviate from the design concept of the present invention and will not be repeated here. It should also fall within the scope of protection of this application.

[0057] In some examples, as shown in Figures 7 and 8, elastic deformation structures 322 are provided at the corners of the second frame body 320. The elastic deformation structures 322 are used to adjust the size of the second frame body 320 to ensure that the positioning protrusion 321 and the positioning recess 311 can be smoothly assembled together. Alternatively, the second frame body 320 may be a rectangular ring-shaped frame, and the elastic deformation structures 322 are provided at the four corners of the second frame body 320. The elastic deformation structures 322 are used to adjust the length and width of the second frame body 320.

[0058] When the number of the plurality of subunits is greater than 130, as shown in FIG10 , reinforcing ribs are provided on opposite sides of the first end plate 930 and the second section plate 940 to effectively improve the structural strength of the first end plate 930 and the second section plate 940 .

[0059] To sum up, the technical solution proposed in the embodiment of the present invention is that the first electrode and the second electrode on the opposite sides of any adjacent sub-units are separated by a partition plate to prevent the first electrode and the second electrode on the opposite sides of the adjacent sub-units from short-circuiting, and the main matching protrusion and the main matching recess cooperate to form a main sealing matching circuit. Since the main sealing matching circuit has a good sealing effect, a simple production process, and a low production cost, at least one of the first liquid inlet channel, the first liquid outlet channel, the second liquid inlet channel, and the second liquid outlet channel separated between adjacent frames by the main sealing matching circuit has the advantages of simple production process, low production cost, and good sealing effect.

[0060] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A flow battery, characterized in that: The invention comprises a plurality of subunits arranged in sequence, each of the subunits comprising a first electrode having a first cavity, a second electrode having a second cavity, a frame, a separator, and a proton exchange membrane, wherein the proton exchange membrane is arranged at an inner hole of the frame, the first electrode is located on a first side of the proton exchange membrane, the second electrode is located on a second side of the proton exchange membrane, and the separator is arranged on a side of one of the first electrode and the second electrode facing away from the other of the first electrode and the second electrode; In which, the first electrode and the second electrode on the opposite sides of any adjacent sub-units are separated by the partition plate, and the opposite sides of any adjacent frames are provided with a main matching protrusion, a main matching recess, a first liquid inlet channel, a first liquid outlet channel, a second liquid inlet channel and a second liquid outlet channel, the main matching protrusion and the main matching recess cooperate to form a main sealing matching circuit, the first liquid inlet channel, the first cavity and the first liquid outlet channel are connected, the second liquid inlet channel, the second cavity and the second liquid outlet channel are connected, and at least one of the first liquid inlet channel, the first liquid outlet channel, the second liquid inlet channel and the second liquid outlet channel is separated by the main sealing matching circuit.

2. The flow battery according to claim 1, wherein The main mating protrusion includes a first main mating protrusion, a second main mating protrusion, a third main mating protrusion and a fourth main mating protrusion, and the main mating recess includes a first main mating recess, a second main mating recess, a third main mating recess and a fourth main mating recess. The first main mating protrusion and the first main mating recess cooperate to form a first main sealing mating circuit, the second main mating protrusion and the second main mating recess cooperate to form a second main sealing mating circuit, the third main mating protrusion and the third main mating recess cooperate to form a third main sealing mating circuit, and the fourth main mating protrusion and the fourth main mating recess cooperate to form a fourth main sealing mating circuit. The first liquid inlet channel is separated by the first main sealing mating circuit, the first liquid outlet channel is separated by the second main sealing mating circuit, the second liquid inlet channel is separated by the third main sealing mating circuit, and the second liquid outlet channel is separated by the fourth main sealing mating circuit.

3. The flow battery according to claim 2, wherein: The first main fitting recess, the second main fitting recess, the third main fitting recess and the fourth main fitting recess are located on the first side of the frame body, and the first main fitting protrusion, the second main fitting protrusion, the third main fitting protrusion and the fourth main fitting protrusion are located on the second side of the frame body.

4. The flow battery according to any one of claims 1 to 3, characterized in that A flow balancing structure is provided between the first liquid inlet channel and the first cavity; and / or A flow equalization structure is provided between the first cavity and the first liquid outlet channel; and / or A flow balancing structure is provided between the second liquid inlet channel and the second cavity; and / or A flow balancing structure is provided between the second cavity and the second liquid outlet channel.

5. The flow battery according to any one of claims 1 to 3, characterized in that A secondary mating protrusion and a secondary mating recess are also provided on the opposite sides of any adjacent frame bodies, and the secondary mating protrusion and the secondary mating recess cooperate to form an annular secondary sealing mating circuit, and the main mating protrusion, the main mating recess, the first liquid inlet channel, the first liquid outlet channel, the second liquid inlet channel, the second liquid outlet channel, the first electrode and the second electrode are all located on the inner side of the area enclosed by the secondary sealing mating circuit.

6. The flow battery according to claim 5, characterized in that Also includes: A first insulating plate and a second insulating plate, the first insulating plate is located on the first side of the second insulating plate, and the multiple sub-units are located between the first insulating plate and the second insulating plate. A first liquid inlet channel, a first liquid outlet channel, a main matching protrusion, a main matching recess, a secondary matching protrusion and a secondary matching recess are also provided between the first insulating plate and the adjacent frame. A second liquid inlet channel, a second liquid outlet channel, a main matching protrusion, a main matching recess, a secondary matching protrusion and a secondary matching recess are also provided between the second insulating plate and the adjacent frame.

7. The flow battery according to claim 5, characterized in that The height of the main matching protrusion is 4mm to 12mm and the width is 1.5mm to 3mm, and the depth of the main matching recess is 4mm to 12mm and the width is 2mm to 3.5mm; and / or The height of the auxiliary matching protrusion is 4mm to 12mm and the width is 1.5mm to 3mm. The depth of the auxiliary matching recess is 4mm to 12mm and the width is 2mm to 3.5mm.

8. The flow battery according to any one of claims 1 to 3, characterized in that The frame includes a first frame and a second frame, one of the first frame and the second frame is provided with a positioning recess, and the other is provided with a positioning protrusion, and one of the first frame and the second frame is further provided with an annular sealing rib, the positioning protrusion is placed in the positioning recess, and the sealing rib presses the periphery of the proton exchange membrane to the other of the first frame and the second frame, the main matching recess and the main matching protrusion are located outside the area enclosed by the second frame and on the first frame, and the partition plate is provided on the side of the second frame facing away from the first frame.

9. The flow battery according to claim 8, characterized in that An elastic deformation structure is provided at a corner of the second frame body, and the elastic deformation structure is used to adjust the size of the second frame body.

10. The flow battery according to claim 8, wherein The height of the positioning protrusion is 1.5mm to 3.5mm and the width is 1.5mm to 3mm. The depth of the positioning concave is 1.5mm to 3.5mm and the width is 2mm to 3.5mm.

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