Sealing device of cathode closed type titanium alloy electric pile

Abstract

The invention discloses a sealing device of a cathode closed type titanium alloy galvanic pile, and belongs to the technical field of galvanic pile sealing. Comprising a sealing box, a sealing cover is arranged on the upper surface of the sealing box, an electric pile body is arranged in the sealing box, a fixing frame is integrally formed above the outer side wall of the sealing box, an embedding groove is formed in the upper surface of the fixing frame, and an embedding plate is integrally formed below the outer side wall of the sealing cover; when the arranged rotating circular plate is rotated, an inserting block is driven to be inserted into a fixing hole to achieve sealing, the problem of bolt looseness caused by vibration is thoroughly avoided, the sealing performance is always stable, and the situation that a reaction medium leaks due to bolt looseness is avoided; and meanwhile, after the sealing cover is fixed in place, a limiting plate is shifted to enable a limiting column to be clamped into a limiting hole of the rotating circular plate, so that the sealing effect is improved. And the rotating circular plate is prevented from rotating automatically in accidental collision or long-term vibration, mistaken retraction of the inserting block is avoided, and the sealing state is kept stable and reliable all the time.

Description

Technical Field

[0001] The present invention relates to the technical field of battery stack sealing, and in particular to a sealing device for a cathode closed titanium alloy battery stack. Background Art

[0002] The stack is the core component of many electrochemical devices, such as fuel cell stacks and flow battery stacks. During operation, the internal reaction media (such as fuel gas, oxidant, electrolyte, etc.) must flow within their respective flow channels to prevent leakage between different media and leakage to the external environment. Taking fuel cells as an example, hydrogen and air (or oxygen) are supplied to the anode and cathode respectively through different flow channels. If the seal is not good, the mixing of hydrogen and air may cause safety problems and also reduce the efficiency and performance of the fuel cell. For flow batteries, electrolyte leakage will lead to reduced battery performance and even damage the battery components, and may also pollute the surrounding environment. Existing fuel cell stack sealing devices are often sealed by multiple sets of bolts. During the use of the fuel cell stack, it may be affected by factors such as vibration and thermal cycling. The bolts are prone to gradually loosening due to vibration, which will reduce the sealing performance and even cause the seal to fail, resulting in leakage of the reaction medium. Summary of the Invention

[0003] Purpose of the invention: The purpose of the present invention is to provide a solution to the problem that the existing fuel cell sealing device is often sealed by multiple sets of bolts. During the use of the fuel cell, the bolts are prone to gradually loosen due to vibration, which reduces the sealing performance and even causes the seal to fail, resulting in leakage of the reaction medium.

[0004] Technical solution: A sealing device for a cathode closed titanium alloy stack, comprising a sealing box, a sealing cover is provided on the upper surface of the sealing box, and a stack body is provided inside the sealing box; A fixing frame is integrally formed above the outer wall of the sealing box, an embedding groove is provided on the upper surface of the fixing frame, an embedding plate is integrally formed below the outer wall of the sealing cover, a plurality of fixed circular holes are provided on the inner wall of the embedding groove, a plurality of movable cavities are provided inside the embedding plate, a plurality of the interiors of the movable cavities are slidably connected to a piston plate 1, a plurality of plug-in blocks are fixedly connected to one side of the plurality of piston plates 1, and a plurality of the plug-in blocks and one end away from the plurality of piston plates 1 respectively extend to the interiors of the plurality of fixed circular holes.

[0005] Furthermore, an anode air inlet pipe is provided on the right side of the lower surface of the sealed box, an anode air outlet pipe is provided on the right side of the lower surface of the sealed box and behind the anode air inlet pipe, a cathode air inlet pipe is provided on the left side of the lower surface of the sealed box, a cathode air outlet pipe is provided on the left side of the lower surface of the sealed box and behind the cathode air inlet pipe, and positive and negative terminals are provided in front of the sealed box.

[0006] Furthermore, the upper surface of the sealing cover is fixedly connected to a control box, the interior of the control box is slidably connected to a piston plate 2, the center of the upper surface of the piston plate 2 is rotatably connected to a screw via a rotating shaft, the top of the screw extends to the top of the control box and is fixedly connected to a rotating circular plate, and the outer side walls of the control box are respectively fixedly connected to the interiors of multiple active cavities with communicating air pipes.

[0007] Furthermore, a groove is provided on the upper surface of the control box, and a plurality of limiting circular holes are provided on the outer wall of the rotating circular plate. A limiting slide is provided on the upper surface of the control box and located on the right side of the groove. A toggle plate is slidably connected to the inside of the limiting slide, and a limiting column is fixedly connected to the left side of the toggle plate. The left end of the limiting column extends to the inside of the limiting circular hole on the right side.

[0008] Furthermore, a plug-in slot is provided on the upper surface of the sealing box, a docking plate is integrally formed on the lower surface of the sealing cover, an airbag is provided on the outer wall of the docking plate, an extrusion chamber is integrally formed inside the docking plate, a movable plate is slidably connected to the interior of the extrusion chamber, a resistance plate is fixedly connected to the lower surface of the movable plate, the lower surface of the resistance plate is in contact with the inner lower surface of the plug-in slot, the interior of the extrusion chamber is connected to the interior of the airbag, a plurality of springs are fixedly connected to the upper surface of the movable plate and the inner upper surface of the extrusion chamber, and the outer wall of the airbag is in contact with the inner wall of the plug-in slot.

[0009] Furthermore, a guide rod is fixedly connected to the inner left and inner right sides of the limiting slide and located below the limiting column. The outer wall of the guide rod is provided with a spring 2, and the two ends of the spring 2 are respectively fixedly connected to the right side of the toggle plate and the inner right side of the limiting slide.

[0010] Furthermore, the sealing box and the sealing cover are made of titanium alloy.

[0011] Furthermore, the cathode side of the stack body adopts a closed or semi-closed structural design.

[0012] Beneficial effect: When the rotating circular plate is rotated, the plug-in block is driven to be inserted into the fixing hole to achieve sealing, which completely avoids the problem of loosening of the bolts caused by vibration, so that the sealing performance is always stable and there will be no leakage of the reaction medium due to loosening of the bolts. At the same time, when the sealing cover is fixed in place, the limit plate is moved to make the limit column snap into the limit hole of the rotating circular plate, which prevents the rotating circular plate from rotating on its own in accidental collision or long-term vibration, and avoids the plug-in block from accidentally retracting, so that the sealing state is always stable and reliable; When the sealing cover is pressed down, the contact plate at the bottom of the docking plate contacts the bottom of the plug-in slot of the sealing box, pushing the movable plate to squeeze air into the airbag. After the airbag expands, it clings tightly to the inner wall of the plug-in slot, accurately filling the tiny gap between the docking plate and the plug-in slot, thereby always maintaining the pressing force on the sealing surface, ensuring that there will be no leakage even if the pressure fluctuates; During installation, you only need to embed the sealing cover into the fixed frame and rotate the circular plate to lock the plug-in block synchronously. When disassembling, rotate the circular plate in the opposite direction and then turn the limit plate to release the lock, and you can easily remove the sealing cover. The entire process does not require the use of wrenches, screwdrivers and other tools, and can be completed by one person by hand. Compared with the traditional method of loosening multiple bolts one by one, the disassembly and assembly time is greatly shortened, and ordinary operators can also complete it easily, which not only saves labor costs but also improves maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the overall structure of the present invention without a sealing cover; Figure 3 It is a schematic cross-sectional view of the control box of the present invention; Figure 4 is a schematic structural front view of a cross section of an embedded plate of the present invention; Figure 5 1 is a schematic diagram of the top view of the control box of the present invention; Figure 6 is a side structural schematic diagram of the sealing cover, docking plate and airbag cross section of the present invention; Figure 7 This invention Figure 5 Schematic diagram of the enlarged structure at A in the middle; Figure 8 This invention Figure 6 Schematic diagram of the enlarged structure at point B in the middle.

[0014] In the figure: 1. Sealing box; 2. Sealing cover; 3. Fuel cell body; 4. Fixing frame; 5. Embedding groove; 6. Embedding plate; 7. Fixed circular hole; 8. Movable cavity; 9. Piston plate 1; 10. Connecting block; 11. Anode air inlet pipe; 12. Anode air outlet pipe; 13. Cathode air inlet pipe; 14. Cathode air outlet pipe; 15. Positive and negative terminals; 16. Control box; 17. Piston plate 2; 18. Screw; 19. Rotating circular plate; 20. Connecting air pipe; 21. Groove; 22. Limiting circular hole; 23. Limiting slide; 24. Toggle plate; 25. Limiting column; 26. Connecting groove; 27. Docking plate; 28. Air bag; 29. Extrusion cavity; 30. Movable plate; 31. Spring 1; 32. Guide rod; 33. Spring 2; 34. Contact plate. DETAILED DESCRIPTION

[0015] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0016] like Figure 1-Figure 7 As shown, a sealing device for a cathode closed titanium alloy fuel cell stack is provided, comprising a sealing box 1, a sealing cover 2 being provided on the upper surface of the sealing box 1, and a fuel cell body 3 being provided inside the sealing box 1; a fixing frame 4 being integrally formed above the outer wall of the sealing box 1, an embedding groove 5 being provided on the upper surface of the fixing frame 4, an embedding plate 6 being integrally formed below the outer wall of the sealing cover 2, a plurality of fixed circular holes 7 being provided on the inner wall of the embedding groove 5, a plurality of movable cavities 8 being provided inside the embedding plate 6, a plurality of the movable cavities 8 being slidably connected to a piston plate 9, a plurality of the piston plates 9 being fixedly connected to a plurality of plug-in blocks 10 on one side, and a plurality of the plug-in blocks 10 having one end away from the plurality of the piston plates 9 respectively extending to the interior of the plurality of the fixed circular holes 7; A control box 16 is fixedly connected to the upper surface of the sealing cover 2, and a second piston plate 17 is slidably connected to the interior of the control box 16. A screw 18 is rotatably connected to the center of the upper surface of the second piston plate 17 via a rotating shaft. The top of the screw 18 extends to the top of the control box 16 and is fixedly connected to a rotating circular plate 19. The outer side walls of the control box 16 are respectively fixedly connected to the interiors of the multiple active chambers 8 with communicating air pipes 20; When the sealing cover 2 needs to be installed, first align the embedded plate 6 on the outer side of the sealing cover 2 with the embedded groove 5 on the fixing frame 4, and slowly press down to make the embedded plate 6 completely inserted into the embedded groove 5. At this time, the movable cavity 8 in the embedded plate 6 is aligned with the fixed circular hole 7 on the fixing frame 4. Then, the rotating circular plate 19 above the control box 16 is rotated to drive the screw 18 to rotate. Since the screw 18 is threadedly matched with the inner wall of the control box 16, the rotation will push the piston plate 2 17 to slide downward. The piston plate 2 17 moves downward to compress the air in the control box 16. The compressed air enters each movable cavity 8 through the connecting air pipe 20. Under the action of air pressure, the piston plate 1 9 in the movable cavity 8 drives the plug-in block 10 to slide outward, and the end of the plug-in block 10 is accurately inserted into the fixed circular hole 7, thereby firmly fixing the embedded plate 6 to the fixing frame 4, realizing fast fixing of the sealing cover 2 and the sealing box 1. The entire fixing process does not require the use of bolts. The synchronous locking of multiple groups of plug-in blocks 10 can be completed only by rotating the circular plate 19, which greatly shortens the installation time. When removing the sealing cover 2, the rotating circular plate 19 is rotated in the opposite direction, and the screw 18 drives the piston plate 2 17 to move upward, forming a negative pressure in the control box 16, and the air pressure in the active chamber 8 is reduced accordingly. The piston plate 19 drives the plug-in block 10 to retract into the active chamber 8, so that the plug-in block 10 is separated from the fixed circular hole 7. At this time, the mechanical lock between the sealing cover 2 and the sealing box 1 is released. It is only necessary to lift the sealing cover 2 upward to quickly remove it from the sealing box 1, so that the synchronous action of multiple sets of locking structures can be completed in a single step, shortening the installation or disassembly time from several minutes of the traditional method to tens of seconds. It is especially suitable for maintenance scenarios that require frequent disassembly and assembly, significantly improving the efficiency of battery stack inspection or component replacement, and avoiding the tedious actions of repeated bending and tightening with force when fixing with traditional bolts, reducing labor intensity, and also reducing the probability of problems such as bolt stripping and component damage due to improper use of tools.

[0017] like Figure 1 and Figure 2 As shown, an anode air inlet pipe 11 is provided on the right side of the lower surface of the sealed box 1, an anode air outlet pipe 12 is provided on the right side of the lower surface of the sealed box 1 and behind the anode air inlet pipe 11, a cathode air inlet pipe 13 is provided on the left side of the lower surface of the sealed box 1, a cathode air outlet pipe 14 is provided on the left side of the lower surface of the sealed box 1 and behind the cathode air inlet pipe 13, and positive and negative terminals 15 are provided in front of the sealed box 1; The closed-loop system formed by the cathode air inlet pipe 13 and the cathode air outlet pipe 14, combined with the rapid sealing structure of the sealing cover 2, allows the cathode side gas to circulate stably under high pressure, preventing the infiltration of outside air from affecting the reaction purity. The anode air inlet pipe 11 and the anode air outlet pipe 12 can prevent the leakage of flammable and explosive gases such as hydrogen. At the same time, the positive and negative terminals 15 are wrapped with a titanium alloy shell to wrap the internal copper conductive column, and the surface is silver-plated to improve the conductivity efficiency. The insulating layer uses polytetrafluoroethylene material to prevent leakage. The positive terminal is connected to the anode plate of the battery stack, and the negative terminal is connected to the cathode plate. It is connected to the load or power supply through an external cable. The spacing between the terminals must meet the safe insulation distance to improve the energy efficiency of the battery stack.

[0018] like Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 7As shown, a groove 21 is provided on the upper surface of the control box 16, and a plurality of limiting circular holes 22 are provided on the outer side wall of the rotating circular plate 19. A limiting slide groove 23 is provided on the upper surface of the control box 16 and on the right side of the groove 21. A toggle plate 24 is slidably connected to the interior of the limiting slide groove 23. The left side of the toggle plate 24 is fixedly connected to a limiting column 25. The left end of the limiting column 25 extends to the inside of the limiting circular hole 22 on the right side. A guide rod 32 is fixedly connected to the inner left and inner right sides of the limiting slide groove 23 and located below the limiting column 25. The outer side wall of the guide rod 32 is sleeved with a spring 23. The two ends of the spring 23 are fixedly connected to the right side of the toggle plate 24 and the inner right side of the limiting slide groove 23 respectively. When the sealing cover 2 and the sealing box 1 are fixed, the toggle plate 24 is toggled to the right, and the toggle plate 24 slides along the guide rod 32 in the limiting slide groove 23, driving the limiting post 25 to move to the right, and the spring 23 is compressed. When the limiting post 25 is aligned with the limiting circular hole 22 on the outer wall of the rotating circular plate 19, the toggle plate 24 is released, and the spring 23 is reset to push the toggle plate 24 to move to the left, so that the limiting post 25 is accurately inserted into the limiting circular hole 22 on the right side. At this time, the limiting post 25 clamps the rotating circular plate 19, preventing it from rotating around the screw 18, thereby locking the position of the piston plate 2 17, ensuring that the plug-in block 10 is always in the state of being inserted into the fixed circular hole 7 , maintain the fixed connection between the sealing cover 2 and the sealing box 1. When the sealing cover 2 needs to be removed, push the toggle plate 24 to the right, compress the spring 2 33, and make the limit column 25 withdraw from the limit hole 22. At this time, the rotating circular plate 19 is unlocked and can be rotated freely to control the retraction of the plug-in block 10. After the operation is completed, release the toggle plate 24, and the spring 2 33 pushes the toggle plate 24 to reset. However, at this time, the limit column 25 is no longer inserted into the limit hole 22. Repeat the above operation until the next locking is required, thereby preventing vibration or external force collision from causing accidental rotation of the rotating circular plate 19, causing safety hazards such as gas leakage, and maintaining the reliability of the battery stack sealing system.

[0019] like Figure 1 and Figure 2 As shown, the sealing box 1 and the sealing cover 2 are made of titanium alloy. Titanium alloy can react with oxygen at room temperature to form a dense TiO2 passivation film. This film has excellent stability in acidic (such as dilute sulfuric acid generated at the cathode of fuel cells), alkaline (such as KOH electrolyte for water electrolysis) and chloride environments. Acidic condensed water containing fluoride ions may exist on the cathode side where the sealing box 1 contacts the sealing cover 2. The passivation film of titanium alloy can effectively prevent pitting corrosion and crevice corrosion.

[0020] like Figure 2 As shown, the cathode side of the stack body 3 adopts a closed or semi-closed structure design; The cathode-side bipolar plate of the stack body 3 is precisely machined from titanium alloy, and the flow channel is in the form of a serpentine or parallel straight groove. Both ends are sealedly connected to the cathode air inlet pipe 13 and the cathode air outlet pipe 14 through a gas collecting cavity, so that oxygen can diffuse evenly in the closed flow channel. The unreacted oxygen returns to the circulation pump through the outlet, forming a closed cycle and improving the oxygen utilization rate.

[0021] like Figure 2 、 Figure 6 and Figure 8 As shown, a plug-in slot 26 is provided on the upper surface of the sealing box 1, and a docking plate 27 is integrally formed on the lower surface of the sealing cover 2. An airbag 28 is provided on the outer wall of the docking plate 27. An extrusion chamber 29 is integrally formed inside the docking plate 27. A movable plate 30 is slidably connected to the interior of the extrusion chamber 29. A resistance plate 34 is fixedly connected to the lower surface of the movable plate 30. The lower surface of the resistance plate 34 contacts the inner lower surface of the plug-in slot 26. The interior of the extrusion chamber 29 is connected to the interior of the airbag 28. A plurality of springs 31 are fixedly connected to the upper surface of the movable plate 30 and the inner upper surface of the extrusion chamber 29. The outer wall of the airbag 28 contacts the inner wall of the plug-in slot 26. When the sealing cover 2 is installed downward to the sealing box 1, the docking plate 27 is gradually inserted into the plug-in groove 26. At this time, the contact plate 34 at the bottom of the docking plate 27 first contacts the inner bottom wall of the plug-in groove 26. As the sealing cover 2 continues to be pressed down, the contact plate 34 is subjected to an upward reaction force, pushing the movable plate 30 to slide upward in the extrusion chamber 29. The movable plate 30 moves upward to compress the spring 1 31, and at the same time, the air in the extrusion chamber 29 is quickly pressed into the airbag 28 through the connecting channel. The airbag 28 expands outward under the action of air pressure, and its outer side wall fits tightly against the inner side wall of the plug-in groove 26 to form an annular sealing belt, thereby achieving liquid sealing and preventing liquid leakage inside the sealing box 1.

[0022] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A sealing device for a cathode closed titanium alloy stack, comprising a sealing box (1), characterized in that: A sealing cover (2) is provided on the upper surface of the sealed box (1), and a fuel cell stack body (3) is provided inside the sealed box (1); A fixed frame (4) is integrally formed above the outer wall of the sealing box (1), an embedding groove (5) is provided on the upper surface of the fixed frame (4), an embedding plate (6) is integrally formed below the outer wall of the sealing cover (2), a plurality of fixed circular holes (7) are provided on the inner wall of the embedding groove (5), a plurality of movable cavities (8) are provided inside the embedding plate (6), a plurality of movable cavities (8) are slidably connected to the interior of a piston plate (9), a plurality of plug-in blocks (10) are fixedly connected to one side of the plurality of piston plates (9), and a plurality of plug-in blocks (10) are respectively extended to the interior of the plurality of fixed circular holes (7) at one end away from the plurality of piston plates (9).

2. The sealing device for a cathode closed titanium alloy stack according to claim 1, characterized in that: An anode air inlet pipe (11) is provided on the right side of the lower surface of the sealed box (1), an anode air outlet pipe (12) is provided on the right side of the lower surface of the sealed box (1) and located behind the anode air inlet pipe (11), a cathode air inlet pipe (13) is provided on the left side of the lower surface of the sealed box (1), a cathode air outlet pipe (14) is provided on the left side of the lower surface of the sealed box (1) and located behind the cathode air inlet pipe (13), and positive and negative terminal posts (15) are provided in front of the sealed box (1).

3. The sealing device for a cathode closed titanium alloy stack according to claim 1, characterized in that: The upper surface of the sealing cover (2) is fixedly connected to a control box (16), the interior of the control box (16) is slidably connected to a second piston plate (17), the center of the upper surface of the second piston plate (17) is rotatably connected to a screw rod (18) via a rotating shaft, the top end of the screw rod (18) extends to the top of the control box (16) and is fixedly connected to a rotating circular plate (19), and the outer side walls of the control box (16) are respectively fixedly connected to the interiors of the plurality of active chambers (8) with communicating air pipes (20).

4. The sealing device for a cathode closed titanium alloy stack according to claim 3, characterized in that: The upper surface of the control box (16) is provided with a groove (21), the outer side wall of the rotating circular plate (19) is provided with a plurality of limiting circular holes (22), the upper surface of the control box (16) and located on the right side of the groove (21) is provided with a limiting sliding groove (23), the interior of the limiting sliding groove (23) is slidably connected to a toggle plate (24), the left side of the toggle plate (24) is fixedly connected to a limiting column (25), and the left end of the limiting column (25) extends to the inside of the limiting circular hole (22) on the right side.

5. The sealing device for a cathode closed titanium alloy stack according to claim 1, characterized in that: The upper surface of the sealing box (1) is provided with a plug-in slot (26), the lower surface of the sealing cover (2) is integrally formed with a docking plate (27), the outer wall of the docking plate (27) is provided with an airbag (28), the interior of the docking plate (27) is integrally formed with an extrusion cavity (29), the interior of the extrusion cavity (29) is slidably connected to a movable plate (30), the lower surface of the movable plate (30) is fixedly connected to a contact plate (34), the lower surface of the contact plate (34) is in contact with the inner lower surface of the plug-in slot (26), the interior of the extrusion cavity (29) is connected to the interior of the airbag (28), the upper surface of the movable plate (30) and the inner upper surface of the extrusion cavity (29) are fixedly connected with a plurality of springs (31), and the outer wall of the airbag (28) is in contact with the inner wall of the plug-in slot (26).

6. The sealing device for a cathode closed titanium alloy stack according to claim 4, characterized in that: A guide rod (32) is fixedly connected to the inner left side and the inner right side of the limiting slide groove (23) and located below the limiting column (25). The outer wall of the guide rod (32) is provided with a spring 2 (33). The two ends of the spring 2 (33) are fixedly connected to the right side of the toggle plate (24) and the inner right side of the limiting slide groove (23), respectively.

7. The sealing device for a cathode closed titanium alloy stack according to claim 1, characterized in that: The entire material of the sealing box (1) and the sealing cover (2) is titanium alloy.

8. The sealing device for a cathode closed titanium alloy stack according to claim 1, characterized in that: The cathode side of the stack body (3) adopts a closed or semi-closed structural design.

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