Polar plate frame, bipolar plate and electrolytic bath

Abstract

The invention relates to the technical field of electrolytic hydrogen production, and provides a polar plate frame, a bipolar plate and an electrolytic bath. The first surface and the second surface are oppositely arranged on the two sides of the inner side face, the first surface is provided with a first sealing part and a first notch, and the second surface is provided with a second sealing part and a second notch; the covering part is arranged on the first notch, the inner side face and the second notch. According to the invention, part of the surface of the polar plate frame body is coated with the coating part, the cost can be effectively reduced, the first sealing part and the second sealing part form the sealing waterline on the polar plate frame body, the coating part and the sealing waterline are arranged at different positions of the polar plate frame body, and the processing of the sealing waterline is not limited by the thickness of the coating part, so that the sealing performance is improved. Therefore, the sealing stability can be ensured while the cost is reduced, and the problem of poor sealing stability of the polar plate frame in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electrolytic hydrogen production, and in particular to a polar plate frame, a bipolar plate and an electrolytic cell. Background Art

[0002] With the growing demand for low-carbon emission reduction, green hydrogen production technology has received widespread attention. Using renewable energy to produce hydrogen through water electrolysis is the process with the lowest carbon emissions among many hydrogen source options. The promotion and application of hydrogen in energy storage, chemical industry, metallurgy, distributed power generation and other fields has become one of the effective ways to control greenhouse gas emissions and slow down global temperature rise. Adhere to the original intention of green utilization of hydrogen energy, actively develop green hydrogen production technology for water electrolysis, and realize integrated development with renewable energy.

[0003] In the prior art, the plate frame of the bipolar plate is mainly made of materials with good alkali resistance and low resistivity. This material is relatively expensive, which makes the cost high. In order to reduce the cost, a coating structure is adopted. Specifically, a material with good alkali resistance and low resistivity is used as the outer lining, and the inner core is other low-cost high-strength materials. The sealing stability of the plate frame of the coating structure is poor. Summary of the invention

[0004] The present invention provides a polar plate frame, a bipolar plate and an electrolytic cell, which are used to solve the defect of poor sealing stability of the polar plate frame in the prior art.

[0005] The present invention provides a plate frame, comprising: A plate frame body, the plate frame body having an inner side surface, a first surface and a second surface arranged opposite to each other on both sides of the inner side surface, the first surface being provided with a first sealing portion, an end of the first surface close to the inner side surface being provided with a first notch, the second surface being provided with a second sealing portion, and an end of the second surface close to the inner side surface being provided with a second notch; The covering component is arranged on the first notch, the inner side surface and the second notch.

[0006] According to a plate frame provided by the present invention, a first gap is provided between the first end surface of the covering component and the wall surface of the first notch, and / or a second gap is provided between the second end surface of the covering component and the wall surface of the second notch.

[0007] According to a polar plate frame provided by the present invention, the thickness of the first end of the covering component is equal to the depth of the first notch, and / or the thickness of the second end of the covering component is equal to the depth of the second notch.

[0008] According to a plate frame provided by the present invention, the plate frame body is square, and the plate frame body includes two first frames arranged opposite to each other and two second frames arranged opposite to each other; a first positioning portion is provided at the end of the first frame, and a second positioning portion cooperating with the first positioning portion is provided at the end of the second frame.

[0009] According to a pole plate frame provided by the present invention, the material of the covering component includes nickel-copper alloy, nickel alloy, and copper alloy.

[0010] The present invention also provides a bipolar plate, comprising an anode mesh, a cathode mesh, a separator and a plate frame as described in any one of the above items, wherein the separator is arranged in the plate frame body, and the separator divides the interior of the plate frame body into a cathode compartment and an anode compartment, the anode mesh is arranged in the anode compartment, and the cathode mesh is arranged in the cathode compartment.

[0011] According to a bipolar plate provided by the present invention, the separator is welded to the covering component.

[0012] According to a bipolar plate provided by the present invention, the covering component includes a first covering portion and a second covering portion, the first end of the first covering portion covers the first notch, the middle portion of the first covering portion covers a portion of the inner side surface, the first end of the second covering portion covers the second notch, the middle portion of the second covering portion covers the remaining area of ​​the inner side surface, and the second end of the first covering portion and the second end of the second covering portion are connected to form a mounting position; The partition is connected to the installation position.

[0013] A bipolar plate provided according to the present invention further includes an anode rib plate and a cathode rib plate, wherein the anode rib plate is arranged between the anode mesh and the separator, and the cathode rib plate is arranged between the cathode mesh and the separator.

[0014] The present invention further provides an electrolytic cell, comprising a diaphragm and at least two bipolar plates as described in any one of the above items, wherein at least two of the bipolar plates are stacked in sequence, and the diaphragm is disposed between two adjacent bipolar plates.

[0015] The pole plate frame provided by the present invention has a covering component arranged on the first notch, the inner side surface and the second notch of the pole plate frame body, so that the covering component covers a part of the surface of the pole plate frame body, which can effectively reduce costs, and the pole plate frame body is provided with a first sealing portion and a second sealing portion to form a sealing waterline on the pole plate frame body. The covering component and the sealing waterline are arranged at different positions of the pole plate frame body, and the processing of the sealing waterline is not limited by the thickness of the covering component, thereby ensuring the sealing stability while reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the pole plate frame provided by the present invention.

[0018] Figure 2 yes Figure 1 AA section structure schematic diagram.

[0019] Figure 3 yes Figure 1 BB section structure schematic diagram.

[0020] Figure 4 yes Figure 3 Schematic diagram of the local enlarged structure at point C in the figure.

[0021] Figure 5 It is a schematic diagram of the cross-sectional structure of the electrode frame body provided by the present invention.

[0022] Figure 6 It is one of the structural schematic diagrams of the plate frame body and the covering components provided by the present invention.

[0023] Figure 7 This is the second structural schematic diagram of the plate frame body and the covering component provided by the present invention.

[0024] Figure 8 It is a schematic diagram of the exploded structure of the plate frame body provided by the present invention.

[0025] Fig. 9 It is a schematic diagram of the matching structure of the first frame and the second frame provided by the present invention.

[0026] Fig.10 It is a structural schematic diagram of the first frame provided by the present invention.

[0027] Fig.11 This is one of the structural schematic diagrams of the connection between the first frame and the second frame provided by the present invention.

[0028] Fig.12 This is the second structural schematic diagram of the connection between the first frame and the second frame provided by the present invention.

[0029] Fig.13 It is a schematic diagram of the structure of the bipolar plate provided by the present invention.

[0030] Figure numerals: 100, plate frame; 110, plate frame body; 111, first notch; 112, second notch; 113, first sealing groove; 114, second sealing groove; 115, first frame; 1151, first positioning portion; 116, second frame; 1161, second positioning portion; 117, positioning pin; 120, covering component; 121, first covering portion; 122, second covering portion; 123, mounting position; 200, anode mesh; 300, cathode mesh; 400, partition; 500, anode rib plate; 600, cathode rib plate; 700, cathode support plate; 800, elastic mesh. DETAILED DESCRIPTION

[0031] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0036] Combine the following Figure 1-Figure 13 A bipolar plate according to an embodiment of the present invention is described.

[0037] The embodiment of the first aspect of the present invention provides a plate frame, such as Figures 1 to 5 As shown, the electrode plate frame 100 includes an electrode plate frame body 110 and a covering component 120 disposed on the electrode plate frame body 110 .

[0038] Among them, the plate frame body 110 has an inner side surface, a first surface and a second surface arranged on both sides of the inner side surface, the first surface is provided with a first sealing portion, and a first notch 111 is opened at one end of the first surface close to the inner side surface, the second surface is provided with a second sealing portion, and a second notch 112 is opened at one end of the second surface close to the inner side surface, and the covering component 120 is arranged on the first notch 111, the inner side surface and the second notch 112.

[0039] It should be noted that in the prior art, the plate frame includes an inner core and an outer lining coated on the inner core. When the two plate frames are assembled, the outer liners of the two plate frames are abutted against each other. Since the outer surfaces of the two outer liners are both flat, the sealing stability of the plate frame is poor. In order to improve the sealing performance, it is possible to choose to process a sealing waterline on the outer lining. This requires increasing the thickness of the outer lining, which will inevitably increase the material consumption of the outer lining and increase the cost. Failure to process the sealing waterline will affect the long-term stability of the entire tank body seal. Obviously, the cost and sealing stability of the prior art restrict each other and cannot reduce costs while ensuring sealing stability. The present invention arranges a coating component on a portion of the surface of the plate frame body, and designs a sealing waterline on the plate frame body, thereby reducing costs while ensuring sealing stability.

[0040] Specifically, the plate frame body 110 has a first surface and a second surface relative to each other, and an inner side surface arranged between the first surface and the second surface. The covering component 120 covers the inner side surface, one end of the first surface close to the inner side surface, and one end of the second surface close to the inner side surface. The end of the first surface close to the inner side surface is provided with a first notch 111 for accommodating the first end of the covering component 120, and the end of the second surface close to the inner side surface is provided with a second notch 112 for accommodating the second end of the covering component 120.

[0041] A first sealing portion is provided on the first surface to form a sealing waterline; a second sealing portion is provided on the second surface to form a sealing waterline. Processing the sealing waterline on the plate frame body 110 helps in sealing, thereby providing better long-term sealing stability compared to the existing design without a sealing waterline.

[0042] It can be understood that the first surface of the plate frame body 110 has a first notch 111 and a first sealing portion; the second surface of the plate frame body 110 has a second notch 112 and a second sealing portion; the covering component 120 is arranged at the first notch 111, the inner side and the second notch 112. The plate frame body 110 can be made of a low-cost high-strength material, and the covering component 120 is made of a material with good alkali resistance and low resistivity, and the covering component 120 is only coated on a part of the surface of the plate frame body 110, which can effectively reduce the cost while meeting the strength requirements, and the covering component 120 and the sealing waterline are arranged at different positions of the plate frame body 110, and the processing of the sealing waterline is not limited by the thickness of the covering component 120, so that the cost can be reduced under the premise of ensuring the sealing stability.

[0043] The pole plate frame provided in the embodiment of the present invention has a covering component 120 arranged on the first notch 111, the inner side surface and the second notch 112 of the pole plate frame body 110, so that the covering component 120 covers a part of the surface of the pole plate frame body 110, which can effectively reduce the cost, and the pole plate frame body 110 is provided with a first sealing portion and a second sealing portion to form a sealing waterline on the pole plate frame body 110. The covering component 120 and the sealing waterline are arranged at different positions of the pole plate frame body 110, and the processing of the sealing waterline is not limited by the thickness of the covering component 120, thereby reducing the cost while ensuring the sealing stability.

[0044] In one embodiment of the present invention, the first sealing portion includes at least one first sealing groove 113 disposed on the first surface, and the second sealing portion includes at least one second sealing groove 114 disposed on the second surface.

[0045] In one embodiment of the present invention, Figure 4As shown, the thickness of the first end of the covering member 120 is equal to the depth of the first notch 111; of course, the thickness of the second end of the covering member 120 can also be equal to the depth of the second notch 112. It should be noted that the first end of the covering member 120 is the end of the covering member 120 close to the first sealing portion, and the second end of the covering member 120 is the end close to the second sealing portion.

[0046] Optional, such as Figure 5 and Figure 6 As shown, the covering component 120 is U-shaped, and includes a first straight segment, a second straight segment and a third straight segment connected in sequence. The first straight segment is arranged at the first notch 111 of the plate frame body 110, the second straight segment is arranged at the inner side of the plate frame body 110, and the third straight segment is arranged at the second notch 112 of the plate frame body 110. Thus, the covering component 120 is U-shaped and covers the plate frame body 110, so that the parts in contact with the electrolyte are all covering components, which effectively ensures the electrolytic performance.

[0047] It should be noted that in the prior art, the outer liner is fully covered on the inner core at 360°, which is difficult to cover, and the outer liner needs to be bent in a Z-shape, and the bending structure accuracy cannot be guaranteed. In this embodiment, the covering component 120 is U-shaped and covers the plate frame body 110, which is easier to achieve partial covering of the plate frame body 110, and the covering accuracy is high.

[0048] Specifically, the thickness of the first straight section is equal to the depth of the first notch 111, and the first straight section is sunk in the first notch 111; the thickness of the second straight section is equal to the depth of the second notch 112, and the second straight section is sunk in the second notch 112, so that when the two pole plate frames 100 are stacked, the sealing waterlines on the surfaces of the two pole plate frames 100 abut against each other, and at the same time, the covering parts 120 on the surfaces of the two pole plate frames 100 partially abut against each other.

[0049] like Figure 5 and Figure 6 As shown, the covering component 120 is a piece of uniform thickness, and is U-shaped, and can be formed by bending or stamping. The depths of the first notch 111 and the second notch 112 are equal, and the covering component 120 is attached to the first notch 111, the inner side surface, and the second notch 112 of the plate frame body 110, thereby forming the plate frame.

[0050] The plate frame provided in the embodiment of the present invention can significantly reduce the use of the covering component 120 and thus reduce the cost by covering a part of the surface of the plate frame body 110 through the covering component 120, and has good reliability and processability.

[0051] In one embodiment of the present invention, Figure 4As shown, there is a first gap between the first end surface of the covering component 120 and the wall surface of the first notch 111. It should be noted that the first end surface of the covering component 120 is the end surface of the covering component 120 close to the first sealing portion.

[0052] It can be understood that there is a first gap L1 between the end of the first straight section away from the second straight section and the wall of the first notch 111, and the first gap can be 1~2mm, so a first gap is formed between the first end face of the covering component 120 and the wall of the first notch 111, which is convenient for welding and fixing the covering component 120 to the plate frame body 110, and the first gap is filled by welding after welding.

[0053] Furthermore, there is a second gap L2 between the second end surface of the covering component 120 and the wall surface of the second notch 112, and the second gap may be 1-2 mm. It should be noted that the second end surface of the covering component 120 is the end surface of the covering component 120 close to the second sealing portion.

[0054] Optionally, the covering component 120 uses a material with good alkali resistance and good electrical conductivity (low resistivity). For example, the material of the covering component 120 can be nickel-copper alloy, nickel alloy, copper alloy or other materials with good alkali resistance and low resistivity. Preferably, the covering component 120 uses nickel-copper alloy.

[0055] For example, the plate frame body 110 is the main support member, preferably but not limited to a solid structure, and the plate frame body 110 is made of a material having good welding performance with the material of the covering component 120 while meeting the structural strength. Optionally, the plate frame body 110 is made of a low-cost, high-strength material, for example, the plate frame body 110 is made of 316L stainless steel or 310S stainless steel.

[0056] In one embodiment of the present invention, Figure 8 and Fig. 9 As shown, the plate frame body 110 is square, and includes two first frames 115 arranged opposite to each other and two second frames 116 arranged opposite to each other. The two first frames 115 and the two second frames 116 are combined to form a square plate frame body.

[0057] A first positioning portion 1151 is provided at the end of the first frame 115, and a second positioning portion 1161 cooperating with the first positioning portion 1151 is provided at the end of the second frame 116. The first positioning portion 1151 and the second positioning portion 1161 can be positioning pin holes cooperating with the positioning pin 117, which are used for positioning the first frame 115 and the second frame 116 during assembly to ensure assembly accuracy.

[0058] Optionally, the first positioning portion 1151 is a first positioning hole opened at the end of the first frame 115, and the second positioning portion 1161 is a second positioning hole opened at the end of the second frame 116. When the first frame 115 and the second frame 116 are connected, the positioning pin shaft 117 is arranged in the first positioning hole and the second positioning hole to position the first frame 115 and the second frame 116, and then the end of the first frame 115 and the end of the second frame 116 are welded.

[0059] It should be noted that in the prior art, the square plate frame includes four frames connected end to end in sequence, and the frames are fastened and installed by bolts, and the installation accuracy is low. However, the present embodiment adopts the positioning pin 117 to be positioned and assembled on the first positioning part 1151 and the second positioning part 1161 for positioning, and then the first frame 115 and the second frame 116 are welded after positioning and assembly, which can improve the installation accuracy; in addition, after welding, the first surface and the second surface of the plate frame body 110 are plane-sealed and processed, which further improves the processing accuracy, so that the performance of the entire tank is better and more stable.

[0060] The polar plate frame provided by the embodiment of the present invention can reduce costs while ensuring sealing stability, and improve structural strength and processing accuracy.

[0061] In other embodiments, the plate frame body 110 may also be circular, and the plate frame body 110 may be formed as a whole; of course, the plate frame body 110 may also include a plurality of arc-shaped frames, and two adjacent arc-shaped frames are positioned by a positioning component, and the positioning component includes a matching first positioning portion 1151 and a second positioning portion 1161, and the first positioning portion 1151 and the second positioning portion 1161 are respectively arranged at the ends of two adjacent arc-shaped frames. For example, the plate frame body 110 includes two arc-shaped frames, one of which has a first positioning portion 1151 at both ends, and the other has a second positioning portion 1161 at both ends.

[0062] It should be noted here that alkaline water electrolysis hydrogen production equipment is mainly circular and square tanks. Since circular tanks have disadvantages such as unstable internal flow field, inconvenient installation and replacement, high energy consumption, and immature large-scale high-electricity density technology compared to square tanks, it is preferred that the plate frame body 110 is square.

[0063] In a specific embodiment of the present invention, Figure 6 , Figures 8 to 12As shown, the plate frame body 110 includes two first frames 115 arranged opposite to each other and two second frames 116 arranged opposite to each other. The two first frames 115 and the two second frames 116 are combined to form a square plate frame body. A first positioning portion 1151 is provided at the end of the first frame 115, and a second positioning portion 1161 cooperating with the first positioning portion 1151 is provided at the end of the second frame 116.

[0064] The two first frames 115 are arranged opposite to each other, and first positioning holes are provided at both ends of the inner side surface of the first frame 115. A first notch 111 is provided in the middle of one end of the first surface of the first frame 115 connected to the inner side surface, and the first sealing grooves 113 are arranged in a U-shape outside the first notch 111, and there are 5 to 10 first sealing grooves 113 arranged side by side. It should be noted that there is a certain preset distance between the position of the first sealing groove 113 and the position of the first notch 111 to ensure the sealing performance.

[0065] A second notch 112 is formed in the middle of one end of the second surface of the first frame 115 connected to the inner side surface. Second sealing grooves 114 are arranged in a U shape outside the second notch 112 . There are 5 to 10 second sealing grooves 114 arranged side by side.

[0066] The first notches 111 and the second notches 112 are symmetrically arranged on two opposite surfaces of the first frame 115 . The first sealing grooves 113 and the second sealing grooves 114 are equal in number and symmetrically arranged on two opposite surfaces of the first frame 115 .

[0067] The two second frames 116 are relatively arranged between the two first frames 115 to form a square plate frame body, and the two end surfaces of the second frame 116 are provided with second positioning holes, and the first surface of the second frame 116 is connected to the inner side surface at one end thereof with a through first notch 111, and the first surface of the second frame 116 is provided with a first sealing groove 113 at the other end thereof, and the second surface of the second frame 116 is connected to the inner side surface at one end thereof with a through second notch 112, and the second surface of the second frame 116 is provided with a second sealing groove 114 at the other end thereof. Preferably, the first notch 111 and the second notch 112 are symmetrically arranged on the two opposite surfaces of the second frame 116, and the number of the first sealing groove 113 and the second sealing groove 114 are equal, and are symmetrically arranged on the two opposite surfaces of the second frame 116.

[0068] The covering component 120 includes four covering members, which are U-shaped covering plates. The four covering members are respectively disposed on the two first frames 115 and the two second frames 116 .

[0069] It should be noted here that in the first frame 115 and the second frame 116, the positions of the first notches 111 correspond, the positions of the second notches 112 correspond, the number of first sealing grooves 113 is equal and the positions correspond one to one, and the number of second sealing grooves 114 is equal and the positions correspond one to one. In this way, in the pole plate frame body 110 formed by connecting the two first frames 115 and the two second frames 116, the first notches 111, the second notches 112, the first sealing grooves 113, and the second sealing grooves 114 correspond to each other.

[0070] The processing process of the plate frame body 110 of this embodiment is as follows: The first frame 115 and the second frame 116 are both processed with a first notch 111 and a second notch 112 . The first frame 115 is processed with a first positioning hole, and the second frame 116 is processed with a second positioning hole.

[0071] The four covering parts are respectively attached to the first notch 111, the inner side surface and the second notch 112 of the four frames (two first frames 115 and two second frames 116), and there is a first gap (gap) between the first end surface of the covering part and the wall surface of the first notch 111, and there is a second gap (gap) between the second end surface of the covering part and the wall surface of the second notch 112. The covering part and the frame are fixed by welding and the gap is filled.

[0072] The first frame 115 and the second frame 116 are positioned and assembled by positioning the positioning pin shaft 117 disposed in the first positioning hole and the second positioning hole. After the assembly is completed, the first frame 115 and the second frame 116 are welded.

[0073] The first sealing groove 113 and the second sealing groove 114 are processed on the first frame 115 and the second frame 116 respectively, and there is a distance between the first sealing groove 113 and the first notch 111, and between the second sealing groove 114 and the second notch 112; wherein the number of the first sealing groove 113 and the second sealing groove 114 is 5 to 10 to ensure the sealing performance.

[0074] It should be noted that after the first frame 115 and the second frame 116 are welded, the first sealing groove 113 and the second sealing groove 114 are processed as a whole on the plate frame body 110, so as to further improve the processing accuracy of the first sealing groove 113 and the second sealing groove 114. Compared with the existing square groove design without sealing waterline, the sealing surface accuracy of this embodiment is greatly improved, and the corresponding electrolytic cell performance is better.

[0075] The embodiment of the second aspect of the present invention provides a bipolar plate, such as Fig.13 As shown, the bipolar plate includes an anode mesh 200, a cathode mesh 300, a separator 400 and a plate frame 100. The plate frame 100 adopts the structure provided by any of the above embodiments.

[0076] like Figure 1 and Figure 8 As shown, the plate frame 100 includes a plate frame body 110 and a covering component 120 covering the inner side of the plate frame body 110, and a partition 400 is arranged in the middle of the plate frame 100 to block the cathode and anode electrolytes, thereby dividing the inside of the plate frame body 110 into a cathode compartment and an anode compartment, and at the same time plays a role in conducting electricity between the small compartments; the anode mesh 200 is arranged in the anode compartment, and the cathode mesh 300 is arranged in the cathode compartment; an anode outlet connected to the anode compartment is opened on the plate frame body 110, and a cathode outlet connected to the cathode compartment is opened on the plate frame body 110.

[0077] The bipolar plate provided in the embodiment of the present invention has a covering component 120 arranged on the first notch 111, the inner side surface and the second notch 112 of the plate frame body 110, so that the covering component 120 covers a portion of the surface of the plate frame body 110, which can effectively reduce costs, and the plate frame body 110 is provided with a first sealing groove 113 and a second sealing groove 114 to form a sealing waterline on the plate frame body 110. The covering component 120 and the sealing waterline are arranged at different positions of the plate frame body 110, and the processing of the sealing waterline is not limited by the thickness of the covering component 120, thereby reducing costs while ensuring sealing stability, and improving structural strength and processing accuracy, as well as sealing performance and electrolysis efficiency.

[0078] In one embodiment of the present invention, the partition plate 400 is welded to the covering member 120 .

[0079] It should be noted that in the prior art, the plate frame includes an inner core and an outer liner covering the inner core, and the separator and the outer liner are designed as an integrated structure, so the separator needs to be bent and arranged on the inner core, and the flatness of the separator with a bent design is poor. In this embodiment, the separator 400 is welded to the covering component 120, so the separator 400 can be a whole flat plate, so the flatness of the separator 400 in this embodiment is better than the flatness of the existing separator that needs to be bent.

[0080] Further, such as Figure 7 As shown, the covering component 120 includes a first covering portion 121 and a second covering portion 122, the first end of the first covering portion 121 covers the first notch 111, the middle portion of the first covering portion 121 covers a partial area of ​​the inner side surface, the first end of the second covering portion 122 covers the second notch 112, the middle portion of the second covering portion 122 covers the remaining area of ​​the inner side surface, the second end of the first covering portion 121 and the second end of the second covering portion 122 are connected to form a mounting position 123; the partition 400 is connected to the mounting position 123.

[0081] It can be understood that the covering component 120 includes two parts, the two parts cover the plate frame body 110, and the two parts form a mounting position 123 on the inner side of the plate frame body 110 to facilitate the connection and fixation of the separator 400.

[0082] Optionally, the first covering portion 121 and the second covering portion 122 have the same structure and are both Z-shaped. The middle portion of the first covering portion 121 covers half of the inner side surface of the plate frame body 110, and the middle portion of the second covering portion 122 covers the other half of the inner side surface of the plate frame body 110. The second end of the first covering portion 121 and the second end of the second covering portion 122 are welded to form an inwardly extending installation position 123, thereby facilitating the welding of the partition 400 to the installation position 123.

[0083] It should be noted here that if the covering component 120 is U-shaped, when the separator 400 is directly welded to the covering component 120, a weld will appear at the welding position of the covering component 120 and the separator 400, and the position of the weld will affect the connection stability and the covering effect of the covering component 120 on the plate frame body 110. Further, in this embodiment, the second end of the first covering portion 121 and the second end of the second covering portion 122 extend inward and connect to form a mounting position 123 for mounting the separator 400, and the separator 400 is welded to the mounting position 123. Since the mounting position 123 is a plane, the welding position is a welding plane, which effectively improves the welding stability of the separator 400 and the covering component 120, and the welding of the separator 400 does not affect the covering effect of the covering component 120 on the plate frame body 110.

[0084] In one embodiment of the present invention, Fig.13 As shown, the bipolar plate further includes an anode rib plate 500 and a cathode rib plate 600 . The anode rib plate 500 is disposed between the anode mesh 200 and the separator 400 , and the cathode rib plate 600 is disposed between the cathode mesh 300 and the separator 400 .

[0085] It can be understood that the anode rib plate 500 is located in the anode compartment and is arranged on the partition 400, and the cathode rib plate 600 is located in the cathode compartment and is arranged on the partition 400. The anode rib plate 500 and the cathode rib plate 600 are evenly arranged on the partition 400, which play a role in conductivity and support in the small chamber, and at the same time enhance the strength of the partition 400, further improve the long-term stability of the electrolytic cell, and to a certain extent can solve the problem of insufficient strength and large deformation of the partition 400 in the existing large-format plate frame 100.

[0086] Furthermore, the bipolar plate further includes a cathode support plate 700 and an elastic net 800. The cathode rib plate 600, the cathode support plate 700, the elastic net 800 and the cathode net 300 are sequentially arranged in the cathode compartment.

[0087] An embodiment of the third aspect of the present invention provides an electrolytic cell, which includes a diaphragm and at least two bipolar plates provided by any of the above embodiments, wherein the at least two bipolar plates are stacked in sequence, and a diaphragm is provided between two adjacent bipolar plates.

[0088] The electrolytic cell provided by the embodiment of the present invention has a covering component 120 arranged on the first notch 111, the inner side surface and the second notch 112 of the plate frame body 110, so that the covering component 120 covers part of the surface of the plate frame body 110, which can effectively reduce costs, and the plate frame body 110 is provided with a first sealing groove 113 and a second sealing groove 114 to form a sealing waterline on the plate frame body 110. The covering component 120 and the sealing waterline are arranged at different positions of the plate frame body 110. The processing of the sealing waterline is not limited by the thickness of the covering component 120, thereby reducing costs while ensuring the stability of the seal; in addition, the anode rib plate 500 and the cathode rib plate 600 are arranged on the partition 400 to play a role in conducting and supporting the small chamber, while strengthening the strength of the partition 400, and having better conductivity, can withstand a larger current density, achieve high electrical density operation, higher electrolysis efficiency, and better long-term operation cost.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plate frame, characterized in that: include: A plate frame body, the plate frame body having an inner side surface, a first surface and a second surface arranged opposite to each other on both sides of the inner side surface, the first surface being provided with a first sealing portion, an end of the first surface close to the inner side surface being provided with a first notch, the second surface being provided with a second sealing portion, and an end of the second surface close to the inner side surface being provided with a second notch; The covering component is arranged on the first notch, the inner side surface and the second notch.

2. The plate frame according to claim 1, characterized in that: There is a first gap between the first end surface of the covering component and the wall surface of the first notch, and / or, A second gap is defined between the second end surface of the covering component and the second notch wall surface.

3. The plate frame according to claim 1, characterized in that: The thickness of the first end of the covering component is equal to the depth of the first notch, and / or, The thickness of the second end of the covering component is equal to the depth of the second notch.

4. The electrode plate frame according to any one of claims 1 to 3, characterized in that: The plate frame body is square and includes two first frames arranged opposite to each other and two second frames arranged opposite to each other; a first positioning portion is provided at the end of the first frame, and a second positioning portion cooperating with the first positioning portion is provided at the end of the second frame.

5. The electrode plate frame according to any one of claims 1 to 3, characterized in that: The material of the covering component includes nickel-copper alloy, nickel alloy and copper alloy.

6. A bipolar plate, characterized in that: It comprises an anode mesh, a cathode mesh, a separator and a plate frame as claimed in any one of claims 1 to 5, wherein the separator is arranged in the plate frame body, the separator divides the interior of the plate frame body into a cathode compartment and an anode compartment, the anode mesh is arranged in the anode compartment, and the cathode mesh is arranged in the cathode compartment.

7. The bipolar plate according to claim 6, characterized in that: The partition plate is welded to the covering member.

8. The bipolar plate according to claim 6 or 7, characterized in that: The covering component includes a first covering portion and a second covering portion, wherein the first end of the first covering portion covers the first notch, the middle portion of the first covering portion covers a portion of the inner side surface, the first end of the second covering portion covers the second notch, the middle portion of the second covering portion covers the remaining area of ​​the inner side surface, and the second end of the first covering portion and the second end of the second covering portion are connected to form a mounting position; The partition is connected to the installation position.

9. The bipolar plate according to claim 6 or 7, characterized in that: It also includes an anode rib plate and a cathode rib plate. The anode rib plate is arranged between the anode mesh and the separator, and the cathode rib plate is arranged between the cathode mesh and the separator.

10. An electrolytic cell, characterized in that: It comprises a diaphragm and at least two bipolar plates according to any one of claims 6 to 9, wherein at least two of the bipolar plates are stacked in sequence, and the diaphragm is arranged between two adjacent bipolar plates.

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