Bipolar plate of electrolytic bath

Abstract

The utility model provides a bipolar plate of an electrolytic bath, and relates to the technical field of electrolytic baths. The bipolar plate of the electrolytic cell comprises a bipolar plate body, an electrode net, a fixing nail and a pressing ring, a groove is formed in the bipolar plate body, the fixing nail penetrates through the pressing ring and is used for penetrating through a connecting part, connected with the bipolar plate body, on the electrode net, and the fixing nail is in threaded connection with the bottom of the groove. And the pressing ring and the groove bottom of the groove clamp a connecting part connected with the bipolar plate body on the electrode net. According to the fixing mode of the bipolar plate body and the electrode net, corresponding welding equipment does not need to be matched on a construction site, the defect that the bipolar plate body and the electrode net are fixed in a welding mode can be overcome, and the fixing efficiency of the bipolar plate body and the electrode net can also be improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electrolytic cell bipolar plate technical field, specifically, relate to a kind of electrolytic cell bipolar plate. BACKGROUND

[0002] Currently, in electrolytic cell bipolar plate, the fixed mode of electrode net and bipolar plate is welding form, that is, electrode net is laid flat on the upper and lower surfaces of bipolar plate, then nickel wire is melted on the edge of electrode net using laser welder, so that electrode net and bipolar plate are connected into one body. However, this fixed mode needs to be matched with corresponding welding equipment at construction site, and the fixing efficiency of electrode net and bipolar plate is low. SUMMARY

[0003] The problem solved by the utility model is how to improve the fixing efficiency of electrode net and bipolar plate.

[0004] To solve the above problems, the utility model provides a kind of electrolytic cell bipolar plate, including bipolar plate body, fixed nail and pressure ring, recess is provided on the bipolar plate body, the fixed nail penetrates the pressure ring, and is used to penetrate the connecting part of electrode net connected with the bipolar plate body, the fixed nail is threadedly connected with the groove bottom of the recess, so that the pressure ring and the groove bottom of the recess clamp the connecting part of electrode net connected with the bipolar plate body.

[0005] Optionally, the inner wall of the side away from the edge of the bipolar plate body of the recess is inclinedly arranged, and the inclination direction is gradually inclined away from the edge of the bipolar plate body along the groove bottom to the groove opening direction of the recess.

[0006] Optionally, the bipolar plate body is provided with the recess at both ends in the direction of plate thickness, and the central axes of the internal threaded holes provided in the recesses at both ends are staggered, and the recess, the fixed nail and the pressure ring are one-to-one corresponding connection.

[0007] Optionally, one end of the pressure ring towards the groove bottom of the recess is provided with a protrusion, and the protrusion is used for extruding the connecting part of electrode net connected with the bipolar plate body.

[0008] Optionally, the pressure ring includes a first connecting ring and a second connecting ring, a first internal thread is arranged on the inner wall of the first connecting ring, a second internal thread is arranged on the inner wall of the second connecting ring, the rotation direction of the first internal thread hole is same with the rotation direction of the second internal thread, the fixed nail is threadedly connected with the first connecting ring through the first internal thread, and the second connecting ring is threadedly connected with the first connecting ring through the second internal thread.

[0009] Optionally, a countersunk hole is arranged on the first connecting ring, and one end of the fixed nail away from the first connecting ring is embedded in the countersunk hole.

[0010] Optionally, the electrolytic cell bipolar plate further comprises an elastic member, the elastic member is sleeved on the fixing nail, and the elastic member is connected between the compression ring and the electrode net.

[0011] Optionally, the end of the compression ring connected with the electrode net is attached with a rubber pad.

[0012] Optionally, the fixing nail is provided with an insulating structure.

[0013] Optionally, the end of the fixing nail away from the bipolar plate body is provided with a groove, and the groove is used for dismounting the fixing nail.

[0014] Compared with the related art, the electrolytic cell bipolar plate has the following advantages: the fixing nail is screwed with the groove bottom through the compression ring and the connecting part on the electrode net connected with the bipolar plate body, the fixing nail can not only limit the compression ring and the electrode net, but also apply a pressing force to the compression ring towards the groove bottom wall through the screwing of the fixing nail, under the action of the pressing force, the compression ring and the groove bottom can clamp the connecting part on the electrode net connected with the bipolar plate body, so that the connecting part on the electrode net connected with the bipolar plate body can be tightly attached to the groove bottom, thus, the fixing mode of the bipolar plate body and the electrode net can not need to be matched with corresponding welding equipment on the construction site, which can not only eliminate the disadvantages of the welding mode of the bipolar plate body and the electrode net, but also improve the fixing efficiency of the bipolar plate body and the electrode net. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The fixing mode of the bipolar plate and the electrode net in the related art is welding;

[0016] Figure 2 The structure schematic view of the fixing mode of the bipolar plate body and the electrode net in the embodiment of the utility model is shown in the figure.

[0017] Figure 3 The structure schematic view of the compression ring in the embodiment of the utility model is shown in the figure.

[0018] MARKED DESCRIPTION:

[0019] 1-bipolar plate body; 11-groove; 2-electrode net; 3-fixing nail; 4-compression ring; 41-first connecting ring; 42-second connecting ring. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0021] In the attached diagram, the X-axis represents the horizontal position, with the positive direction of the X-axis (where the arrow points) indicating the left side and the negative direction (opposite to the positive direction) indicating the right side. Similarly, the Z-axis represents the vertical position, with the positive direction of the Z-axis (where the arrow points) indicating the top and the negative direction (opposite to the positive direction) indicating the bottom. It should be noted that the aforementioned representations of the Z-axis and X-axis are merely for ease of description and simplification, and do not imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0022] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in sequences other than those illustrated or described herein.

[0023] An electrode mesh 2 is fixed to the upper and lower surfaces of the bipolar plate body 1 of the alkaline water hydrogen production electrolyzer. Both the bipolar plate body 1 and the electrode mesh 2 are circular. Since the working solution of the bipolar plate in the alkaline water electrolyzer is highly alkaline, ordinary carbon steel, stainless steel and other metal materials are easily corroded. Therefore, after the bipolar plate body 1 is manufactured, it is usually nickel-plated on its entire surface to resist alkaline corrosion.

[0024] Currently, the electrode mesh 2 is fixed to the bipolar plate body 1 by welding, such as Figure 1 As shown, electrode mesh 2 is laid flat on the upper and lower surfaces of bipolar plate body 1, and then nickel wire is melted onto the edge of electrode mesh 2 using a laser welding machine, connecting electrode mesh 2 and bipolar plate body 1 as one unit. However, this fixing method requires corresponding welding equipment on-site, and the fixing efficiency between electrode mesh 2 and bipolar plate body 1 is relatively low. In addition, during the welding process, when the weld formation is poor and there are sharp points, the sharp points on the weld may puncture the diaphragm; even if there is a missed weld, it will affect the current flow between bipolar plate body 1 and electrode mesh 2; the heat output during the welding process may also damage the nickel plating layer, resulting in the bipolar plate body 2 around the weld being easily corroded by alkaline solution, and the electrodes being unable to be replaced if problems occur.

[0025] To address the problems existing in the current method of fixing the bipolar plate body 1 and the electrode mesh 2, this utility model embodiment provides an electrolytic cell bipolar plate. This electrolytic cell bipolar plate changes the method of fixing the bipolar plate body 1 and the electrode mesh 2, which can not only achieve the fixing between the bipolar plate body 1 and the electrode mesh 2, but also improve the fixing efficiency between the bipolar plate body 1 and the electrode mesh 2.

[0026] CombinationFigure 2 The utility model discloses an electrolytic cell bipolar plate, including bipolar plate body 1, fixed nail 3 and compression ring 4, be provided with recess 11 on bipolar plate body 1, fixed nail 3 penetrates compression ring 4, and is used for penetrating the connecting portion of electrode net 2 and the connection of bipolar plate body 1, fixed nail 3 is screwed with the groove bottom of recess 11 to make compression ring 4 and the groove bottom of recess 11 clamp the connecting portion of electrode net 2 and the connection of bipolar plate body 1.

[0027] Specifically, the end of the bipolar plate body 1 is provided with a recess 11, that is, the recess 11 is located at the outer peripheral frame of the bipolar plate body 1. The connecting portion of the electrode net 2 refers to the edge portion of the electrode net 2 for connecting with the bipolar plate body 1. The edge portion of the electrode net 2 for connecting with the bipolar plate body 1 is uniformly provided with a plurality of through holes. The connecting portion of the electrode net 2 and the compression ring 4 are respectively provided with through holes. The bottom wall of the recess 11, that is, the recess 11 located at the negative direction of the Z-axis, is provided with an internal thread hole. The central axis position of the compression ring 4 is provided with a through hole. The fixed nail 3 includes a nail cap and a nail rod fixed at the lower end of the nail cap. The nail rod is provided with an external thread. During installation, the through holes on the compression ring 4, the through holes of the electrode net 2, and the internal thread hole on the bottom wall of the recess 11 are aligned. Then, the nail rod of the fixed nail 3 is screwed with the internal thread hole on the bottom wall of the recess 11 after passing through the compression ring 4 and the electrode net 2 in sequence. With the tightening of the fixed nail 3, the fixed nail 3 exerts a downward force on the compression ring 4. Under the action of the force, the compression ring 4 extrudes the connecting portion of the electrode net 2 and cooperates with the bottom wall of the recess 11 to clamp the left end of the electrode net 2, so that the left end of the electrode net 2 can be tightly attached to the bottom wall of the recess 11.

[0028] Therefore, in the embodiment, the fixed nail 3 penetrates the compression ring 4 and the connecting portion of the electrode net 2 connected with the bipolar plate body 1, and is screwed with the groove bottom of the recess 11. The fixed nail 3 can not only limit the compression ring 4 and the electrode net 2, but also apply a pressing force to the compression ring 4 towards the bottom wall of the recess 11 by tightening the fixed nail 3. Under the action of the pressing force, the compression ring 4 and the groove bottom of the recess 11 can clamp the connecting portion of the electrode net 2 connected with the bipolar plate body 1, so that the connecting portion of the electrode net 2 connected with the bipolar plate body 1 can be tightly attached to the groove bottom of the recess 11. In this way, the fixing method of the bipolar plate body 1 and the electrode net 2 can not need to match corresponding welding equipment at the construction site, which can not only eliminate the disadvantages of fixing the bipolar plate body 1 and the electrode net 2 by welding, but also improve the fixing efficiency of the bipolar plate body 1 and the electrode net 2.

[0029] In some embodiments, the compression ring 4 can be omitted, that is, the fixed nail 3 directly presses the left end of the electrode net 2. Compared with the method of using the compression ring 4, the fixed nail 3 may rub against the electrode net 2 in the later tightening stage, which is easy to wear the electrode net 2.

[0030] Optionally,Figure 2 As shown in the figure, the inner wall of the groove 11 away from the edge of the bipolar plate body 1 is inclined, and the inclination direction is gradually inclined away from the edge of the bipolar plate body 1 from the groove bottom to the groove opening direction of the groove 11.

[0031] Specifically, the inner wall of the groove 11 away from the edge of the bipolar plate body 1, that is, the inner wall of the groove 11 close to the center of the bipolar plate body 1, when the connecting part of the electrode net 2 edge is pressed in the groove 11, as shown in the figure, Figure 2 The electrode net 2 will cover the inner wall and bend along the inner wall, so the inner wall of the groove 11 is inclined away from the edge of the bipolar plate body 1 from the groove bottom to the groove opening direction of the groove 11, and after the inclination, the electrode net 2 will only produce a small bending angle at the side wall of the groove, avoiding the damage of the electrode net 2.

[0032] In this way, by inclining the inner wall of the groove 11 towards the electrode net 2 towards the electrode net 2, the inner wall of the groove 11 towards the electrode net 2 has a slope, which can make the left end of the electrode net 2 be fixed on the bottom wall of the groove 11 with a small bending angle, so as to reduce the bending angle of the electrode net 2, so as to ensure the structural strength of the electrode net 2.

[0033] Optionally, in combination with Figure 2 As shown in the figure, the bipolar plate body 1 is provided with grooves 11 at both ends in the plate thickness direction, and the central axes of the internal threaded holes provided at the grooves 11 at both ends are staggered, and the grooves 11, the fixing nails 3 and the compression rings 4 are one-to-one corresponding connection.

[0034] Specifically, the plate thickness direction refers to the Z-axis direction. The two ends of the bipolar plate body 1 in the plate thickness direction are the upper and lower ends of the bipolar plate body 1, and the upper and lower ends of the bipolar plate body 1 are respectively provided with grooves 11, and one fixing nail 3 fixes one compression ring 4 on the bottom wall of one groove 11. The groove bottom of the two grooves 11 is provided with an internal threaded hole, and the two internal threaded holes are respectively screwed with the corresponding fixing nail 3, and the axes of the two internal threaded holes are staggered, that is, the axes of the two internal threaded holes are not coincident.

[0035] In this way, by providing grooves 11 at both ends of the bipolar plate body 1 in the plate thickness direction, and one-to-one corresponding connection of the grooves 11, the fixing nails 3 and the compression rings 4, the electrode net 2 can be fixed at both ends of the bipolar plate body 1 in the plate thickness direction, and the central axes of the internal threaded holes provided at the grooves 11 at both ends are staggered, so that during the tightening of the two fixing nails 3, the stress of the bipolar plate body 1 in the same direction can be avoided. It is too concentrated to disperse the stress received by the bipolar plate body 1, so as to ensure the structural stability of the bipolar plate body 1.

[0036] Optionally, the compression ring 4 is provided with a protrusion at one end away from the groove bottom of the groove 11, and the protrusion is used to extrude the connecting part of the electrode net 2 connected with the bipolar plate body 1.

[0037] Specifically, the one end of the compression ring 4 towards the groove bottom of the groove 11 refers to the lower end of the compression ring 4, i.e. the one end of the compression ring 4 in the negative direction of the Z axis. The lower end of the compression ring 4 is provided with protrusions, and the number of the protrusions is multiple. The multiple protrusions are used to extrude the connecting part of the electrode net 2 connected to the bipolar plate body 1.

[0038] In this way, by providing the one end of the compression ring 4 towards the groove bottom of the groove 11 with protrusions, the protrusions are used to extrude the connecting part of the electrode net 2 connected to the bipolar plate body 1. The setting of the protrusions can increase the roughness of the contact surface between the compression ring 4 and the connecting part of the electrode net 2 connected to the bipolar plate body 1, increase the friction effect between the compression ring 4 and the electrode net 2, avoid the shaking of the electrode net 2, and further improve the fixing stability of the electrode net 2.

[0039] Optionally, in combination with Figure 3 As shown, the compression ring 4 comprises a sleeved first connecting ring 41 and a second connecting ring 42. The inner wall of the first connecting ring 41 is provided with a first internal thread, and the inner wall of the second connecting ring 42 is provided with a second internal thread. The rotation direction of the first internal thread hole is the same as that of the second internal thread. The fixing nail 3 is threadedly connected to the first connecting ring 41 through the first internal thread, and the second connecting ring 42 is threadedly connected to the first connecting ring 41 through the second internal thread.

[0040] Specifically, the compression ring 4 can comprise a first connecting ring 41 and a second connecting ring 42. The inner wall of the first connecting ring 41 is provided with a first internal thread, and the inner wall of the second connecting ring 42 is provided with a second internal thread. The rotation direction of the first internal thread hole is the same as that of the second internal thread. The fixing nail 3 is threadedly connected to the first connecting ring 41 through the first internal thread, and the second connecting ring 42 is threadedly connected to the first connecting ring 41 through the second internal thread. Since the rotation direction of the first internal thread hole is the same as that of the second internal thread, after the fixing nail 3 is tightened, the first connecting ring 41 has a tendency to rotate towards the tightening direction relative to the second connecting ring 42. Under this tendency, the first connecting ring 41 can exert a downward force on the second connecting ring 42, so that the second connecting ring 42 can secondarily press the electrode net 2 after the fixing nail 3 is tightened.

[0041] In this way, by threadedly connecting the fixing nail 3 to the first connecting ring 41 through the first internal thread, and threadedly connecting the second connecting ring 42 to the first connecting ring 41 through the second internal thread, the rotation direction of the first internal thread hole is the same as that of the second internal thread. After the fixing nail 3 is tightened, the first connecting ring 41 has a tendency to rotate towards the tightening direction relative to the second connecting ring 42, so that the first connecting ring 41 can exert a downward force on the second connecting ring 42, and the second connecting ring 42 can secondarily press the electrode net 2, thereby improving the fixing stability of the electrode net 2.

[0042] Optionally, the first connecting ring is provided with a countersunk hole, and the end of the fixing nail 3 away from the first connecting ring 41 is embedded in the countersunk hole.

[0043] Specifically, the upper end of the first connecting ring 41 is provided with a countersunk hole (not shown in the figure), and the end of the fixing nail 3 away from the first connecting ring 41, i.e. the upper end of the fixing nail 3, can be embedded in the countersunk hole.

[0044] In this way, by providing the first connecting ring 41 with a countersunk hole and embedding the end of the fixing nail 3 away from the first connecting ring 41 in the countersunk hole, the aesthetic appearance of the use of the fixing nail 3 can be improved.

[0045] Optionally, the electrolytic cell bipolar plate further comprises a resilient member, the resilient member is sleeved on the fixing nail 3, and the resilient member is connected between the compression ring 4 and the electrode mesh 2.

[0046] Specifically, the resilient member can be a compression spring, the compression spring is sleeved on the fixing nail 3 and connected between the compression ring 4 and the electrode mesh 2.

[0047] In this way, by sleeving the resilient member on the fixing nail 3 and connecting the resilient member between the compression ring 4 and the electrode mesh 2, the tightening of the fixing nail 3 can increase the elastic force of the resilient member, thereby further improving the fixing stability of the electrode mesh 2.

[0048] Optionally, the end of the compression ring 4 connected with the electrode mesh 2 is attached with a rubber pad.

[0049] Specifically, the rubber pad is attached to the lower end of the compression ring 4, i.e. the end of the compression ring 4 connected with the electrode mesh 2.

[0050] In this way, by attaching the rubber pad to the end of the compression ring 4 connected with the electrode mesh 2, the rubber pad can increase the friction effect between the compression ring 4 and the electrode mesh 2, thereby improving the fixing effect of the electrode mesh 2.

[0051] In the above embodiment, the rubber pad can be preformed with a through hole corresponding to the protrusion to avoid the protrusion.

[0052] Optionally, the fixing nail 3 is provided with an insulating structure.

[0053] Specifically, the insulating structure can be an insulating coating, such as an insulating paint.

[0054] In this way, by providing the fixing nail 3 with an insulating structure, the conduction of the fixing nail 3 can be avoided, and the current flow effect between the double clamping plate 1 and the electrode mesh 2 can be ensured.

[0055] Optionally, the end of the fixing nail 3 away from the bipolar plate body 1 is provided with a groove, and the groove is used for dismounting the fixing nail 3.

[0056] Specifically, the shape of the groove can be cross-shaped, single-shaped or the like. In this way, the end of the fixing nail 3 away from the bipolar plate body 1 is provided with a groove, and the groove is used for dismounting the fixing nail 3, which can facilitate the operator to dismount the fixing nail 3 by using a screwdriver or the like, and improve the dismounting efficiency of the fixing nail 3.

[0057] Although the utility model discloses as above, the protection scope of the utility model is not limited to this only. The person skilled in the art can make various changes and modifications without departing from the spirit and scope of the utility model, and these changes and modifications will all fall into the protection scope of the utility model.

Claims

1. An electrolyser bipolar plate characterised in that, The bipolar plate body (1) is provided with a groove (11), the fixing nail (3) penetrates the compression ring (4) and is used for penetrating the connecting part of the electrode net (2) connected with the bipolar plate body (1), and the fixing nail (3) is threadedly connected with the bottom of the groove (11), so that the compression ring (4) and the bottom of the groove (11) clamp the connecting part of the electrode net (2) connected with the bipolar plate body (1).

2. The electrolyser bipolar plate of claim 1, characterised in that, The inner wall of the groove (11) away from the edge of the bipolar plate body (1) is inclined, and the inclination direction is gradually away from the edge of the bipolar plate body (1) from the bottom to the opening of the groove (11).

3. The electrolyser bipolar plate of claim 1, wherein, The bipolar plate body (1) is provided with the groove (11) at both ends in the plate thickness direction, and the central axes of the internal threaded holes of the grooves (11) at both ends are staggered.

4. The electrolyser bipolar plate of claim 1, wherein, The compression ring (4) is provided with a protrusion at one end facing the bottom of the groove (11), and the protrusion is used for extruding the connecting part of the electrode net (2) connected with the bipolar plate body (1).

5. The electrolyser bipolar plate of claim 1, wherein, The compression ring (4) comprises a sleeved first connecting ring (41) and a second connecting ring (42), the inner wall of the first connecting ring (41) is provided with a first internal thread, the inner wall of the second connecting ring (42) is provided with a second internal thread, the rotation direction of the first internal thread hole is the same as that of the second internal thread, the fixing nail (3) is threadedly connected with the first connecting ring (41) through the first internal thread, and the second connecting ring (42) is threadedly connected with the first connecting ring (41) through the second internal thread.

6. The electrolyser bipolar plate of claim 5, wherein, The first connecting ring is provided with a countersunk hole, and one end of the fixing nail (3) away from the first connecting ring is embedded in the countersunk hole.

7. The electrolyser bipolar plate of claim 1, wherein Further comprising an elastic member, the elastic member is sleeved on the fixing nail (3), and the elastic member is connected between the compression ring (4) and the electrode net (2).

8. The electrolyser bipolar plate of claim 1, wherein, The end of the compression ring (4) connected with the electrode net (2) is attached with a rubber pad.

9. The electrolyser bipolar plate of claim 1, wherein, The fixing nail (3) is provided with an insulating structure.

10. The electrolyser bipolar plate of claim 1, wherein, The end of the fixing nail (3) away from the bipolar plate body (1) is provided with a groove, and the groove is used for dismounting the fixing nail (3).

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