Flow battery stack seal fastening leak testing apparatus and method

Abstract

The application relates to a kind of liquid flow battery stack sealing fastening leak detection equipment and method, including lifting wire body, lifting wire body middle part is equipped with stack servo press, stack servo press is installed in stack automatic leak detection mechanism, and stack servo press both sides are equipped with visual guide screwing robot;Lifting wire body includes welded base, welded base is symmetrically arranged at the both sides of stack servo press, screw rod hoist is installed at the both ends of welded base, and driving motor is installed in the middle of welded base.The application is compressed by the accurate control of pressure and displacement of stack servo press, and the electric screwing gun sets accurate torque to tighten, which improves the consistency of product, and also improves the product qualification rate and quality.

Description

Technical Field

[0001] This invention belongs to the field of flow battery stack assembly, and relates to equipment and methods for sealing, fastening and leak testing of flow battery stacks. Background Technology

[0002] Currently, the assembly and testing of flow battery stacks mainly rely on manual operation. After the stacks are stacked, manual tightening is performed on both sides sequentially using torque wrenches. Simultaneously, the downward pressure of the bolts compresses the stack. After assembly, the test ports of the stacks are manually sealed for airtightness testing. This manual tightening method results in poor consistency among the stacks after compaction, requires two people to operate simultaneously, and is extremely inefficient. Manual leak testing also requires a significant amount of time for tooling sealing, further contributing to the inefficiency. Given the increasing demand for flow batteries and the low efficiency of manual assembly, this invention patent effectively solves this problem. It automates the stack sealing, tightening, and leak testing process using mechanical equipment. Through precise control of pressure displacement by a servo press, a robot drives a tightening gun with a settable torque to automatically tighten the bolts, improving both product quality and production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a sealing, fastening, and leak testing device and method for flow battery stacks, which can solve problems such as poor product consistency and low production efficiency during the production and assembly process of flow batteries.

[0004] According to the technical solution provided by this invention: a flow battery stack sealing and fastening leak testing equipment includes a lifting line, a stack servo press located in the middle of the lifting line, an automatic leak testing mechanism for the stack installed in the stack servo press, and vision-guided tightening robots located on both sides of the stack servo press; the lifting line includes a welding base, symmetrically arranged on both sides of the stack servo press, with screw lifters installed at both ends of the welding base, and a drive motor installed in the middle of the welding base, the output shaft of the drive motor connected to the input end of the screw lifter, and the moving end of the screw lifter connected to the four corners of the bottom of the automatic conveyor roller conveyor; conveyor rollers are provided on both sides of the automatic conveyor roller conveyor, and a pressing avoidance zone is provided in the middle; the stack servo press includes a press base, a pressing platform located in the middle of the top surface of the press base, and a pressing platform installed on the top of the pressing platform. The system includes an inductive switch, a baffle plate on the rear side of the pressing table with a proximity switch mounted on it, columns around the pressing table with sliding plates on the columns, a clamping fixture at the bottom of the sliding plates, an upper beam fixed to the upper column, a servo cylinder mounted on the upper beam with its piston connected to the sliding plate, an automatic conveyor roller line located above the pressing table, and the pressing table itself within the vertical projection plane of the pressing clearance zone; an automatic leak testing mechanism for the fuel cell stack includes a base plate mounted on the bottom of the sliding plate, a linear guide rail and a horizontal cylinder mounted on the bottom of the base plate, the piston of the horizontal cylinder connected to the side of the linear guide rail slider, and the bottom of the linear guide rail slider connected to the leak testing mechanism; the leak testing mechanism includes a clamping cylinder with its piston vertically downward and fixedly connected to the upper end of a push rod, the lower end of which is connected to a sealing block. The sealing block has an air passage, one end of which is connected to an air source via an interface; and a vision-guided tightening robot includes a robot base, with a tightening gun and a vision camera system mounted on the mobile end of the industrial robot.

[0005] As a further improvement of the present invention, the output shaft of the drive motor is connected to the input end of the screw hoist in sequence through a coupling, a connecting shaft, and a right-angle gearbox; the column and the press base are fixed by a lock nut; and the upper crossbeam is fixed to the upper end of the column by a lock nut.

[0006] As a further improvement of the present invention, the upper part of the sealing block is provided with a floating groove, and the two sides of the floating groove are provided with first limiting bosses; the bottom surface of the top rod is a floating arc surface, and the two sides of the floating arc surface are provided with second limiting bosses; the floating arc surface is located in the floating groove.

[0007] As a further improvement of the present invention, a floating limit pin is provided in the floating arc surface and the sealing block. The lower part of the floating limit pin is in an interference fit with the sealing block, and the upper part of the floating limit pin is in a clearance fit with the floating arc surface.

[0008] As a further improvement of the present invention, the sealing block adopts a split structure; a spring is sleeved on the outer periphery of the push rod, and the two ends of the spring abut against the piston end of the pressing cylinder and the sealing block.

[0009] A method for sealing and fastening leak testing of a flow battery stack, using the equipment described above, includes the following steps:

[0010] Step 1: The battery stack is transported to the automatic conveyor roller conveyor of the lifting line via an external line. The conveyor rollers on both sides of the automatic conveyor roller conveyor contact the battery stack, and the automatic conveyor roller conveyor brings the battery stack into the battery stack servo press.

[0011] Step 2: The battery stack moves forward in the battery stack servo press until it contacts the baffle. The induction switch transmits the signal to the drive motor of the lifting line. The drive motor starts to rotate and causes the automatic conveyor roller line to descend through the screw elevator.

[0012] Step 3: The battery stack descends along the automatic conveyor roller line. The induction switch on the battery stack servo press detects that the battery stack has landed on the pressing table, and the servo cylinder drives the slide plate to begin descending.

[0013] Step 4: The servo electric cylinder drives the slide plate to move downwards, and after the clamping fixture touches the battery stack, it slowly moves downwards.

[0014] Step 5: Stop when the clamping pressure reaches the rated pressure and hold the position;

[0015] Step 6: The industrial robots on both sides of the battery stack servo press drive the vision camera system to take pictures and position the battery stack screw, and tighten the bolts with the set initial torque using the tightening gun.

[0016] Step 7: The industrial robot leaves the press working area;

[0017] Step 8: The servo electric cylinder drives the clamping fixture to continue pressing down until the pressure is reached, then stops and holds the position.

[0018] Step 9: The tightening gun automatically tightens all bolts in the set sequence with the rated torque;

[0019] Step 10: The automatic leak testing mechanism of the fuel cell stack performs external / internal leak tests on the product;

[0020] Step 11: If the test is successful, the horizontal cylinder of the automatic leak testing mechanism of the battery stack drives the pressing leak testing mechanism to retract, the servo cylinder drives the slide plate to rise, and the battery stack flows out of the press after the lifting line is lifted; if the test fails, the horizontal cylinder of the automatic leak testing mechanism of the battery stack drives the pressing leak testing mechanism to retract, the servo cylinder drives the slide plate to rise, and the battery stack flows out of the battery stack servo press after the automatic conveyor roller of the lifting line is lifted.

[0021] As a further improvement of the present invention, step 10 specifically involves: moving the sealing block above the electrolyte inlet of the battery stack, pressing down the clamping cylinder, pressing the sealing block against the electrolyte inlet of the battery stack, and inputting the leak detection gas into the battery stack through the air passage to ensure that the electrolyte inlet of the battery stack is sealed.

[0022] The positive and progressive effects of this application are as follows:

[0023] This invention uses a fuel cell servo press to precisely control pressure and displacement for compaction, and an electric tightening gun to tighten with a precise torque, which improves product consistency and also increases product qualification rate and quality.

[0024] 2. This invention achieves full automation of the battery stack sealing, fastening, leak testing, and assembly process, greatly improving the production and assembly efficiency of the 500 battery stack and saving labor costs and labor intensity. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall invention.

[0026] Figure 2 This is a schematic diagram of the lifting line in this invention.

[0027] Figure 3 This is a schematic diagram of the structure of the fuel cell stack servo press in this invention.

[0028] Figure 4 This is a schematic diagram of the automatic leak testing mechanism for fuel cell stacks in this invention.

[0029] Figure 5 This is a cross-sectional view of the automatic leak testing mechanism for fuel cell stacks in this invention.

[0030] Figure 6 for Figure 5 Enlarged schematic diagram of region I in the middle.

[0031] Figure 7 This is a schematic diagram of the automatic leak testing mechanism for fuel cell stacks in this invention.

[0032] Figure 8 This is a structural schematic diagram of the vision-guided tightening robot of the present invention.

[0033] Figures 1-2 The system includes an electric stack servo press 100, a lifting line 200, an automatic leak testing mechanism for the electric stack 300, a vision-guided tightening robot 400, a press base 101, a slider 102, a column 102, a slide plate 103, a clamping fixture 104, an upper crossbeam 105, a locking nut 106, a servo electric cylinder 107, an induction switch 108, a welding base 201, a drive motor 202, a coupling 203, a connecting shaft 204, a right-angle gearbox 205, four screw lifters 206, an automatic conveyor roller line 207, a base plate 301, a linear guide rail 302, a horizontal cylinder 303, a connector 304, a clamping cylinder 305, a spring 306, a sealing block 307, a robot base 401, an industrial robot 402, a mounting bracket 403, a vision camera system 404, and a tightening gun 405, etc. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0036] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention 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 for the embodiments of the invention described herein. Furthermore, terms such as "comprising" and "having" mean that in addition to those already listed in "comprising" and "having," other unlisted contents may also be included; for example, a process, method, system, product, or device may include a series of steps or units, not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or devices.

[0037] Due to the angle of the drawing, some parts may not be drawn, but their positions and connections can be understood from the text descriptions.

[0038] In the following detailed description of the embodiments, coordinate references are used. Figure 1 ,by Figure 1 The direction perpendicular to the paper and pointing inwards is called front, and the direction perpendicular to the paper and pointing outwards is called back. Figure 1 The left and right directions in the text are left and right. Figure 1 The vertical direction in the text refers to up and down.

[0039] like Figure 1 As shown, a flow battery stack sealing and fastening leak testing equipment includes a lifting line 200, a stack servo press 100 in the middle of the lifting line 200, an automatic stack leak testing mechanism 300 installed in the stack servo press 100, and vision-guided tightening robots 400 on both sides of the stack servo press 100.

[0040] like Figure 2As shown, the lifting line 200 includes a welding base 201, which is symmetrically arranged on both sides of the fuel cell stack servo press 100. Screw elevators 206 are installed at both ends of the welding base 201, and a drive motor 202 is installed in the middle of the welding base 201. The output shaft of the drive motor 202 is connected to the input end of the screw elevator 206 via a coupling 203, a connecting shaft 204, and a right-angle gearbox 205. The moving end of the screw elevator 206 is connected to the four corners of the bottom of the automatic conveyor roller conveyor 207. Conveying rollers are provided on both sides of the automatic conveyor roller conveyor 207, and a pressing clearance zone 2071 is provided in the middle.

[0041] The welding base 201 is connected to the ground. The lifting line 200 uses a drive motor 202 and four screw lifters 206 for lifting operations. Its advantages are large lifting load, stable operation, low noise, and adjustable lifting speed and position.

[0042] like Figure 3 As shown, the fuel cell stack servo press 100 includes a press base 101, a pressing platform 109 is provided in the middle of the top surface of the press base 101, an inductive switch 108 is installed on the top of the pressing platform 109, a baffle 110 is provided on the rear side of the pressing platform 109, a proximity switch is installed on the baffle 110, columns 102 are provided around the pressing platform 109, the columns 102 are fixed to the press base 101 by locking nuts 106, a slide plate 103 is slidably installed on the columns 102, the slide plate 103 is guided by the columns 102 to move up and down, a clamping fixture 104 is installed at the bottom of the slide plate 103, an upper crossbeam 105 is fixed to the upper end of the columns 102 by locking nuts 106, a servo cylinder 107 is installed on the upper crossbeam 105, the piston end of the servo cylinder 107 is connected to the slide plate 103 to drive it to move up and down.

[0043] The battery stack servo press 100 is driven by a servo electric cylinder 107, which can not only precisely control the pressure and stroke, but also adjust and set the pressure and displacement according to the assembly process of the battery stack 500, realizing fully automated control of the entire process. The automatic conveyor roller line 207 is located above the pressing table 109, and the pressing table 109 is located within the vertical projection plane of the pressing clearance zone 2071.

[0044] like Figures 4-5As shown, the automatic leak testing mechanism 300 for the fuel cell stack includes a base plate 301, which is installed at the bottom of the slide plate 103. A linear guide rail 302 and a horizontal cylinder 303 are mounted on the bottom of the base plate 301. The piston end of the horizontal cylinder 303 is connected to the side of the slider of the linear guide rail 302. The bottom of the slider of the linear guide rail 302 is connected to a pressing leak testing mechanism via a connector 304. The pressing leak testing mechanism includes a pressing cylinder 305, whose piston end is vertically downward and fixedly connected to the upper end of a push rod 308. The lower end of the push rod 308 is connected to a sealing block 307, which has an air passage. One end of the air passage is connected to an air source via an interface. The upper end of the connector 304 is connected to the bottom of the slider of the linear guide rail 302, and the lower end of the connector 304 is connected to the cylinder body of the pressing cylinder 305.

[0045] like Figure 6 As shown, the sealing block 307 has a floating groove on its upper part, and first limiting bosses are provided on both sides of the floating groove. The bottom surface of the push rod 308 is a floating arc surface, and second limiting bosses are provided on both sides of the floating arc surface. The floating arc surface is located in the floating groove, and the sealing block 307 uses the floating arc surface as the contact surface, allowing it to float. The first and second limiting bosses prevent the push rod 308 from disengaging from the sealing block 307.

[0046] To limit the floating angle, a floating limit pin 309 is provided in the floating arc surface and the sealing block 307. The lower part of the floating limit pin 309 is in an interference fit with the sealing block 307, and the upper part of the floating limit pin 309 is in a clearance fit with the floating arc surface, allowing the floating arc surface to rotate slightly.

[0047] For ease of manufacturing, the sealing block 307 adopts a split structure.

[0048] In order to ensure the clamping force of the sealing block 307 on the battery stack 500, a spring 306 is sleeved on the outer periphery of the push rod 308, and the two ends of the spring 306 abut against the piston end of the clamping cylinder 305 and the sealing block 307.

[0049] The automatic leak testing mechanism 300 for the battery stack is driven by a horizontal cylinder 303 and a linear guide rail 302 to move horizontally. When no leak test is being performed, the horizontal cylinder 303 retracts to avoid the space where the vision-guided tightening robot 400 tightens bolts. When a leak test is required, the horizontal cylinder 303 extends and moves the sealing block 307 above the electrolyte inlet of the battery stack. The pressing cylinder 305 then presses down to press the electrolyte inlet of the battery stack for testing.

[0050] The tightening robot 400 can simultaneously tighten the bolts on both sides of the battery stack 500, ensuring consistency on both sides. For example... Figures 7-8As shown, the vision-guided tightening robot 400 includes a robot base 401, an industrial robot 402 mounted on the robot base 401, a mounting bracket 403 fixed on the moving end of the industrial robot 402, and a tightening gun 405 and a vision camera system 404 fixed on the mounting bracket 403. The industrial robot 402 drives the robot to take pictures, position, and tighten the flow battery stack fixing screw.

[0051] Industrial robot 402 is a six-axis industrial robot, and mounting bracket 403 is fixed to the end of the sixth axis of industrial robot 402.

[0052] The gap between the screw and the mounting hole of the 500 battery stack is relatively large. The screw position varies between different stacks. Therefore, a vision camera is used to take pictures first. After finding the precise position of the screw, the 405 tightening gun is controlled to tighten the bolt. The bolt is tightened using an electric torque wrench, which can be set with different torques. The stack is tightened in stages, and the torque control is highly accurate to ensure the tightening quality.

[0053] A method for sealing and fastening a flow battery stack for leak testing includes the following steps:

[0054] Step 1: The battery stack 500 is conveyed to the automatic conveyor roller 207 of the lifting line 200 via the external line. The conveyor rollers on both sides of the automatic conveyor roller 207 contact the battery stack 500 and bring the battery stack 500 into the battery stack servo press 100.

[0055] Step 2: The battery stack 500 advances in the battery stack servo press 100 until it contacts the baffle 110. The inductive switch transmits the signal to the drive motor 202 of the lifting line 200. The drive motor 202 starts to rotate and causes the automatic conveyor roller line 207 to descend through the screw elevator 206.

[0056] Step 3: The battery stack 500 descends along the automatic conveyor roller 207. The induction switch 108 on the battery stack servo press 100 senses that the battery stack 500 has landed on the pressing table 109, and the servo cylinder 107 drives the slide plate 103 to begin descending.

[0057] Step 4: Servo electric cylinder 107 drives slide plate 103 to move down, and after clamping fixture 104 touches battery stack 500, it slowly moves down.

[0058] Step 5: Stop pressing the clamping fixture 104 when the pressure reaches the rated pressure and maintain the position;

[0059] Step 6: The industrial robots 402 on both sides of the battery stack servo press 100 drive the vision camera system 404 to take pictures and position the screw of the battery stack 500, and the tightening gun 405 tightens the bolts with the set initial torque.

[0060] Step 7: Industrial robot 402 leaves the press working area;

[0061] Step 8: The servo electric cylinder 107 drives the clamping fixture 104 to continue pressing down until the pressure is reached, then stops and maintains the position.

[0062] Step 9: The tightening gun automatically tightens all bolts in the set sequence with the rated torque;

[0063] Step 10: The automatic leak testing mechanism 300 of the fuel cell stack performs external / internal leak tests on the product;

[0064] Step 11: If the test is successful, the horizontal cylinder 303 of the automatic leak testing mechanism 300 drives the pressing leak testing mechanism to retract, the servo cylinder 107 drives the slide plate 103 to rise, and the battery stack 500 flows out of the press after the lifting line 200 is lifted; if the test fails, the horizontal cylinder 303 of the automatic leak testing mechanism 300 drives the pressing leak testing mechanism to retract, the servo cylinder 107 drives the slide plate 103 to rise, and the battery stack 500 flows out of the battery stack servo press 100 after the automatic conveying roller 207 of the lifting line 200 is lifted.

[0065] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A flow battery stack sealing and fastening leak testing device, characterized in that, The system includes a lifting line (200), a fuel cell stack servo press (100) in the middle of the lifting line (200), an automatic fuel cell stack leak test mechanism (300) installed in the fuel cell stack servo press (100), and vision-guided tightening robots (400) on both sides of the fuel cell stack servo press (100). The lifting line (200) includes a welding base (201), which is symmetrically arranged on both sides of the fuel cell stack servo press (100). Screw elevators (206) are installed at both ends of the welding bases (201), and a drive motor (202) is installed in the middle of the welding bases (201). The output shaft of the drive motor (202) is connected to the input shaft of the screw elevator (206). The ends are connected, and the moving end of the screw elevator (206) is connected to the four corners of the bottom of the automatic conveyor roller line (207); the automatic conveyor roller line (207) has conveyor rollers on both sides and a pressing clearance zone (2071) in the middle; the fuel cell stack servo press (100) includes a press base (101), a pressing table (109) is provided in the middle of the top surface of the press base (101), an induction switch (108) is installed on the top of the pressing table (109), a baffle (110) is provided on the back side of the pressing table (109), a proximity switch is installed on the baffle (110), and columns (102) are provided around the pressing table (109), with a sliding plate (102) slidably installed on the columns (102). 103), the clamping fixture (104) is installed at the bottom of the slide plate (103), the upper crossbeam (105) is fixed at the upper end of the column (102), the servo electric cylinder (107) is installed on the upper crossbeam (105), and the piston end of the servo electric cylinder (107) is connected to the slide plate (103); the automatic conveyor roller line (207) is located above the pressing table (109), and the pressing table (109) is located within the vertical projection plane of the pressing clearance zone (2071); the automatic leak testing mechanism (300) of the fuel cell stack includes a base plate (301), the base plate (301) is installed at the bottom of the slide plate (103), and the bottom of the base plate (301) is equipped with a linear guide rail (302) and a horizontal air filter. The cylinder (303) is connected to the side of the slider of the linear guide rail (302) at the piston end, and the bottom of the slider of the linear guide rail (302) is connected to the pressing and leak testing mechanism; the pressing and leak testing mechanism includes a pressing cylinder (305), the piston end of the pressing cylinder (305) is vertically downward and fixedly connected to the upper end of the top rod (308), the lower end of the top rod (308) is connected to the sealing block (307), the sealing block (307) is provided with an air passage, and one end of the air passage is connected to the air source through an interface; the vision-guided tightening robot (400) includes a robot base (401), and the moving end of the industrial robot (402) is equipped with a tightening gun (405) and a vision camera system (404).

2. The flow battery stack sealing and leak testing equipment as described in claim 1, characterized in that, The output shaft of the drive motor (202) is connected to the input end of the screw hoist (206) in sequence through the coupling (203), the connecting shaft (204), and the right-angle gearbox (205); the column (102) and the press base (101) are fixed by the lock nut (106); the upper crossbeam (105) is fixed to the upper end of the column (102) by the lock nut (106).

3. The flow battery stack sealing and leak testing equipment as described in claim 1, characterized in that, The sealing block (307) has a floating groove on its upper part, and a first limiting boss is provided on both sides of the floating groove; the bottom surface of the top rod (308) is a floating arc surface, and a second limiting boss is provided on both sides of the floating arc surface; the floating arc surface is located in the floating groove.

4. The flow battery stack sealing and leak testing equipment as described in claim 3, characterized in that, The floating arc surface and the sealing block (307) are provided with a floating limit pin (309). The lower part of the floating limit pin (309) and the sealing block (307) are interference fit, and the upper part of the floating limit pin (309) and the floating arc surface are clearance fit.

5. The flow battery stack sealing and fastening leak testing equipment as described in claim 3, characterized in that, The sealing block (307) adopts a split structure; the outer periphery of the push rod (308) is fitted with a spring (306), and the two ends of the spring (306) abut against the piston end of the pressing cylinder (305) and the sealing block (307).

6. A method for sealing and tightening a flow battery stack for leak testing, characterized in that, The method, using the equipment as described in any one of claims 1-5, comprises the following steps: Step 1: The battery stack (500) is transported to the automatic conveyor roller line (207) of the lifting line (200) via the external line. The conveyor rollers on both sides of the automatic conveyor roller line (207) contact the battery stack (500) and the automatic conveyor roller line (207) brings the battery stack (500) into the battery stack servo press (100). Step 2: The battery stack (500) advances in the stack servo press (100) until it contacts the baffle (110). The inductive switch transmits a signal to the drive motor (202) of the lifting line (200). The drive motor (202) starts to rotate and causes the automatic conveyor roller line (207) to descend through the screw elevator (206). Step 3: The battery stack (500) descends along the automatic conveyor roller line (207). The induction switch (108) on the battery stack servo press (100) senses that the battery stack (500) has landed on the pressing table (109), and the servo cylinder (107) drives the slide plate (103) to begin descending. Step 4: The servo cylinder (107) drives the slide plate (103) to move down. After the clamping fixture (104) touches the battery stack (500), it slowly moves down. Step 5: Stop pressing the clamping fixture (104) when the pressure reaches the rated pressure and hold the position. Step 6: The industrial robots (402) on both sides of the battery stack servo press (100) drive the vision camera system (404) to take pictures and position the screw of the battery stack (500), and the tightening gun (405) tightens the bolts with the set initial torque; Step 7: The industrial robot (402) leaves the press working area; Step 8: The servo electric cylinder (107) drives the clamping fixture (104) to continue pressing down, and stops after reaching the pressure, maintaining the position; Step 9: The tightening gun automatically tightens all bolts in the set sequence with the rated torque; Step 10: The automatic leak testing mechanism (300) of the fuel cell stack performs external / internal leak testing on the product; Step 11: If the test is successful, the horizontal cylinder (303) of the automatic leak testing mechanism (300) drives the pressing leak testing mechanism to retract, and the servo cylinder (107) drives the slide plate (103) to rise. After the lifting line (200) is lifted, the battery stack (500) flows out of the press. If the test fails, the horizontal cylinder (303) of the automatic leak testing mechanism (300) drives the pressing leak testing mechanism to retract, and the servo cylinder (107) drives the slide plate (103) to rise. After the automatic conveying roller line (207) of the lifting line (200) is lifted, the battery stack (500) flows out of the battery stack servo press (100).

7. The method for sealing, tightening, and leak testing of a flow battery stack as described in claim 6, characterized in that, Step 10 is as follows: the sealing block (307) moves above the electrolyte inlet of the battery stack, the pressing cylinder (305) presses down, the sealing block (307) presses the electrolyte inlet of the battery stack, the leak detection gas is introduced into the battery stack through the gas channel, and the electrolyte inlet of the battery stack is sealed.

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