Flow battery stack

Abstract

The utility model discloses a flow battery stack which comprises a lower end plate integrated part, a core end plate integrated part, an upper end plate integrated part, a sealing-electrode-membrane frame welding and presetting integrated part and a sealing-electrode-plate frame welding and presetting integrated part, the integrated piece is formed by assembling five kinds of integrated pieces, and only two kinds of key integrated pieces are stacked repeatedly. By adopting the galvanic pile structure provided by the invention, full-automatic assembly of the galvanic pile can be realized, meanwhile, the assembly number of galvanic pile components is greatly reduced, and the assembly efficiency of the galvanic pile is improved; the number of parts is reduced, so that the positioning precision and consistency in the galvanic pile assembling process are also improved, and the performance consistency of products can be improved; requirements on stations, machine tables and mechanical arms of an electric pile assembly automatic production platform are low, the structure is simple, the occupied area is small, and the cost is low.

Description

Technical Field

[0001] This application relates to a flow battery stack, belonging to the field of flow batteries. Background Technology

[0002] In recent years, vanadium redox flow batteries have entered a period of rapid development, with numerous high-power systems ranging from tens to hundreds of megawatts; power plants with capacities up to GWh are commonplace, indicating that they have entered the early stages of commercialization. Vanadium redox flow batteries use aqueous electrolytes, offering significant safety advantages. Furthermore, their power and capacity are completely decoupled, making them suitable for long-term energy storage systems with a high capacity-to-power ratio. No fire or explosion accidents have been reported in commercially operational vanadium redox flow battery systems. These systems have long lifespans and can be deeply charged and discharged, receiving widespread praise from users. As the core component of an energy storage system, the vanadium redox flow battery stack directly determines the system's performance and reliability. The design of reliable stack structures has received increasing attention in recent years.

[0003] Flow battery stacks are assembled by stacking and pressing multiple cells together using a filter press. Individual cells are connected by bipolar plates and contain a negative electrode frame, a negative electrode, an ion-conducting membrane, a positive electrode, and a positive electrode frame. Sealing gaskets are placed between adjacent components. The cells are connected in series in the circuitry and in parallel in the liquid supply system. The positive and negative electrode frames of each cell in series have identical structures. Flow batteries have numerous components, a complex assembly process, low efficiency, and poor consistency, lagging significantly behind the manufacturing processes of mature industrial products. Furthermore, the battery components operate in a complex electrochemical system, involving the coupling of multiple physical fields such as fluid dynamics, thermodynamics, and electrochemistry, resulting in a complex and diverse operating environment. Therefore, there is an urgent need for products with high reliability and strong performance consistency. Utility Model Content

[0004] To address the problems of numerous components, complex assembly processes, low efficiency, and poor consistency in existing flow battery stacks, and to enable battery components to adapt to complex and diverse operating environments and operate in complex electrochemical systems involving the coupling of multiple physical fields such as fluid dynamics, thermodynamics, and electrochemistry, this application provides a flow battery stack product with high reliability and strong performance consistency.

[0005] Specifically, according to one aspect of this application, a flow battery stack is provided, including a lower end plate integral component, a core end plate integral component, and an upper end plate integral component that are stacked and assembled in sequence.

[0006] Alternatingly stacked sealing-electrode-membrane frame welding pre-installed components and sealing-electrode-plate frame welding pre-installed components are respectively provided between the core end plate integrated component, the lower end plate integrated component, and the upper end plate integrated component.

[0007] A battery pack is formed by alternately stacking several of the aforementioned pre-installed seal-electrode-film frame welded integrated components and pre-installed seal-electrode-plate frame welded integrated components.

[0008] Optionally, the positioning accuracy of each part in each integrated component is ≤2mm;

[0009] Preferably, the positioning accuracy of each part in each integral component is ≤1mm;

[0010] Preferably, the frame of each integral component is made of plastic.

[0011] Preferably, the frame material of each integrated component is selected from PE, PP, and PVC;

[0012] Preferably, the stacking accuracy of the flow battery stack is: verticality of the entire stack ≤ ±2mm, and overlap between integral components ≤ ±0.5mm;

[0013] Preferably, the verticality of the entire stack is ≤ ±1 mm, and the overlap between integral parts is ≤ ±0.3 mm.

[0014] Optionally, the lower end plate assembly includes a lower end plate, a lower end plate insulating plate, a lower end plate copper plate, a lower end plate special frame assembly, an electrode, and a sealing gasket, which are assembled sequentially.

[0015] The manufacturing process of the integrated lower end plate is as follows:

[0016] The lower end plate, lower end plate insulating plate, lower end plate copper plate, and lower end plate special frame are integrated and fixed together by insulating screws through positioning holes provided on each component and threaded holes on the lower end plate.

[0017] The electrodes are attached to the bipolar plate of the special frame integral component of the lower end plate in the electrode groove within the special frame integral component of the lower end plate using double-sided adhesive tape.

[0018] The sealing gasket is attached to the surface of the electrode frame of the special frame on the lower end plate by double-sided tape, or it can be integrally molded onto its surface.

[0019] Optionally, the integrated core end plate includes, in sequence, an integrated special frame on the lower side of the core end plate, a copper plate on the lower side of the core end plate, an insulating plate on the core end plate, the core end plate, the insulating plate on the core end plate, an upper copper plate on the core end plate, an integrated special frame on the upper side of the core end plate, an electrode, and a sealing gasket.

[0020] The fabrication process of the integrated core end plate is as follows:

[0021] The special frame on the lower side of the core end plate, the copper plate on the lower side of the core end plate, the insulating plate of the core end plate, the core end plate, the upper copper plate of the core end plate, and the special frame on the upper side of the core end plate are fastened together with insulating screws through the positioning holes provided on each component to the threaded holes of the core end plate to form a whole and be positioned.

[0022] The electrodes are attached to the bipolar plate of the special frame integral component on the upper side of the core end plate, inside the electrode groove, by double-sided adhesive tape.

[0023] The sealing gasket is attached to the surface of the electrode frame of the special frame on the upper side of the core end plate by double-sided tape, or it can be integrally molded onto its surface.

[0024] Optionally, the upper end plate integral component includes an upper end plate special frame integral component, an upper end plate copper plate, an upper end plate insulating plate, and an upper end plate assembled sequentially.

[0025] The manufacturing process of the integrated upper end plate is as follows:

[0026] The upper end plate special frame, upper end plate copper plate, upper end plate insulation plate, and upper end plate are fastened together with insulating screws into the threaded holes of the upper end plate through positioning holes provided on each component, thus forming a whole and positioning them.

[0027] Optionally, the pre-assembled integrated sealing-electrode-membrane frame welding assembly includes a membrane frame, an ion-conducting membrane, a membrane frame flow channel cover, an electrode, and a sealing gasket assembled sequentially.

[0028] The fabrication process of the pre-installed integrated seal-electrode-membrane frame welding component is as follows:

[0029] The ion-conducting membrane and the membrane frame are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding. The membrane frame flow channel cover is welded into the groove of the membrane frame flow channel cover by laser welding or ultrasonic welding to form an ion membrane-membrane frame welded component.

[0030] The electrode is pre-placed on the ion-exchange membrane-membrane frame weldment, and the electrode is placed in the groove in the middle of the ion-exchange membrane-membrane frame weldment, in the part that contacts the ion-conducting membrane; the electrode is bonded to the ion-conducting membrane by adhesive materials such as double-sided tape.

[0031] The sealing gasket is attached to the surface of the membrane frame with double-sided tape, or it can be integrally molded onto the surface.

[0032] Optionally, the pre-assembled integrated sealing-electrode-plate-frame welding assembly includes a plate frame, bipolar plate, plate frame flow channel cover, electrode, and sealing gasket assembled sequentially.

[0033] The fabrication process of the pre-installed integrated sealing-electrode-plate-frame welding component is as follows:

[0034] The bipolar plate and the plate frame are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding; the plate frame flow channel cover is welded into the groove of the plate frame flow channel cover by laser welding or ultrasonic welding to form a bipolar plate-plate frame welded component.

[0035] The electrode is pre-placed on the bipolar plate-plate frame weldment, and the electrode is placed in the groove in the middle of the bipolar plate-plate frame weldment, in the part that contacts the bipolar plate; the electrode is bonded to the bipolar plate by adhesive materials such as double-sided tape.

[0036] The sealing gasket is attached to the surface of the plate frame with double-sided tape, or it can be integrally molded onto the surface.

[0037] Optionally, the integrated special frame of the lower end plate includes a bipolar plate, an electrode frame, and a flow channel cover plate of the electrode frame assembled in sequence.

[0038] The manufacturing process of the special frame integral part of the lower end plate is as follows:

[0039] The bipolar plate and electrode frame of the special frame of the lower end plate are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding. The flow channel cover plate of the electrode frame of the special frame of the lower end plate is welded into the groove of the flow channel cover plate of the electrode frame of the special frame of the lower end plate by laser welding or ultrasonic welding.

[0040] Optionally, the integrated special frame on the lower side of the core end plate includes an electrode frame and a bipolar plate assembled together.

[0041] The fabrication process of the special frame integral part on the lower side of the core end plate is as follows:

[0042] The electrode frame and the bipolar plate of the special frame on the lower side of the core end plate are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding.

[0043] Optionally, the integrated special frame on the upper side of the core end plate includes a bipolar plate, an electrode frame, and a flow channel cover plate of the electrode frame, which are assembled sequentially.

[0044] The fabrication process of the special frame integral part on the upper side of the core end plate is as follows:

[0045] The bipolar plate and the electrode frame of the special frame on the upper side of the core end plate are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding. The flow channel cover plate of the electrode frame of the special frame on the upper side of the core end plate is welded into the groove of the flow channel cover plate of the electrode frame of the special frame on the upper side of the core end plate by laser welding or ultrasonic welding.

[0046] Optionally, the upper end plate special frame integral component includes an upper end plate special frame integral component electrode frame and an upper end plate special frame integral component bipolar plate assembled with each other.

[0047] The manufacturing process of the special frame integral part of the upper end plate is as follows:

[0048] The electrode frame and the bipolar plate of the special frame on the upper end plate are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding.

[0049] It should be noted that the aforementioned double-sided adhesive tape must be resistant to strong acids and alkalis, and possess strong oxidation resistance. Furthermore, the adhesive area on the contact surface between the electrode and the ion-conducting membrane or bipolar plate should be ≤8%, preferably ≤4%.

[0050] After the above-mentioned integral component is fabricated, the fuel cell stack is assembled and integrated, including the following steps:

[0051] S1: Preparation of fuel cell stack assembly platform, including base plate positioning and leveling;

[0052] S2: Position the lower end plate integral component on the assembly platform;

[0053] S3: Place the pre-installed integrated sealing-electrode-membrane frame welding component and the pre-installed sealing-electrode-plate frame welding component on the assembly platform for positioning and stacking, repeating the steps to ensure positioning accuracy;

[0054] S4: Place the core end plate assembly on the assembly platform for positioning and stacking;

[0055] S5: Place the pre-installed integrated sealing-electrode-membrane frame welding component and the pre-installed sealing-electrode-plate frame welding component on the assembly platform for positioning and stacking, repeating the steps to ensure positioning accuracy;

[0056] S6: Place the upper endplate assembly on the assembly platform for positioning and stacking;

[0057] S7: Insert the screw into the screw hole provided in the above-mentioned component, and provide mold springs on one or both sides of the screw;

[0058] S8: Move the assembly platform to the hydraulic press station and position it. Press it to the limit position using the hydraulic press and tighten the mold spring.

[0059] S9: Perform internal and external leakage tests on the fuel cell stack, in accordance with standard NB / T 11062-2023;

[0060] S10: After the test is completed, the stack will be rotated 90° in the stack turning machine;

[0061] S11: The fuel cell stack is flipped off the production line, completing the assembly.

[0062] The beneficial effects that this application can produce include:

[0063] The flow battery stack provided in this application is assembled from five integrated components, with only two key integrated components being repeatedly stacked. By adopting the stack structure proposed in this application, the number of stack components can be greatly reduced while achieving fully automated stack assembly, thereby improving the stack assembly efficiency. The reduction in components also improves the positioning accuracy and consistency during the stack assembly process, which is conducive to improving the performance consistency of the product. The automated production platform for stack assembly requires fewer workstations, machines, and robotic arms, has a simple structure, occupies a small area, and has low cost. Attached Figure Description

[0064] Figure 1 This is a schematic diagram of the overall structure of a flow battery stack provided in one embodiment of this application;

[0065] Figure 2 This is a structural schematic diagram of an integral lower end plate component provided in one embodiment of this application;

[0066] Figure 3 This is a schematic diagram of the structure of an integrated core end plate component provided in one embodiment of this application;

[0067] Figure 4 This is a structural schematic diagram of an integral upper end plate component provided in one embodiment of this application;

[0068] Figure 5 This is a schematic diagram of the structure of the pre-installed integrated sealing-electrode-membrane frame welding component provided in one embodiment of this application;

[0069] Figure 6 This is a schematic diagram of the structure of the pre-installed integrated sealing-electrode-plate-frame welding component provided in one embodiment of this application;

[0070] Figure 7 This is a structural schematic diagram of a special frame integral component for the lower end plate provided in one embodiment of this application;

[0071] Figure 8 This is a structural schematic diagram of a special frame integral component on the lower side of the core end plate provided in one embodiment of this application;

[0072] Figure 9 This is a structural schematic diagram of the special frame integral component on the upper side of the core end plate provided in one embodiment of this application;

[0073] Figure 10 This is a structural schematic diagram of a special frame integral component for the upper end plate provided in one embodiment of this application.

[0074] List of components and reference numerals:

[0075] 1. Lower end plate integral component; 11. Lower end plate; 12. Lower end plate insulating plate; 13. Lower end plate copper plate; 14. Lower end plate special frame integral component; 15. Electrode; 16. Sealing gasket;

[0076] 141. Integrated bipolar plate with special frame on lower end plate; 142. Integrated electrode frame with special frame on lower end plate; 143. Integrated electrode frame flow channel cover with special frame on lower end plate;

[0077] 2. Core end plate integrated component; 21. Core end plate underside special frame integrated component; 22. Core end plate underside copper plate; 23. Core end plate insulation plate; 24. Core end plate; 25. Core end plate upper side copper plate; 26. Core end plate upper side special frame integrated component;

[0078] 211. Integrated electrode frame with special frame on the lower side of the core end plate; 212. Integrated bipolar plate with special frame on the lower side of the core end plate;

[0079] 261. Integrated bipolar plate with special frame on the upper side of the core end plate; 262. Integrated electrode frame with special frame on the upper side of the core end plate; 263. Integrated electrode frame flow channel cover plate with special frame on the upper side of the core end plate;

[0080] 3. Integrated upper end plate; 31. Integrated upper end plate special frame; 32. Upper end plate copper plate; 33. Upper end plate insulation plate; 34. Upper end plate;

[0081] 311. Upper end plate special frame integrated electrode frame; 312. Upper end plate special frame integrated bipolar plate;

[0082] 4. Pre-installed integrated sealing-electrode-membrane frame welding assembly; 41. Membrane frame; 42. Ion conduction membrane; 43. Membrane frame flow channel cover plate;

[0083] 5. Sealing-electrode-plate frame welded pre-installed integrated component; 51. Plate frame; 52. Bipolar plate; 53. Plate frame flow channel cover;

[0084] 6. Battery pack. Detailed Implementation

[0085] The present application is described in detail below with reference to the embodiments, but the present application is not limited to these embodiments.

[0086] Example 1

[0087] like Figure 1 As shown, according to one embodiment of this application, a flow battery stack is provided, including a lower end plate integral component 1, a core end plate integral component 2, and an upper end plate integral component 3 that are stacked and assembled in sequence.

[0088] Each of the core end plate integral component 2, the lower end plate integral component 1, and the upper end plate integral component 3 is provided with alternating stacked sealing-electrode-membrane frame welding pre-placed integral component 4 and sealing-electrode-plate frame welding pre-placed integral component 5.

[0089] A battery pack 6 is formed by alternately stacking several of the aforementioned pre-installed integrated sealing-electrode-film frame welding components 4 and pre-installed sealing-electrode-plate frame welding components 5.

[0090] like Figure 2 As shown, the lower end plate integral component 1 includes a lower end plate 11, a lower end plate insulating plate 12, a lower end plate copper plate 13, a lower end plate special frame integral component 14, an electrode 15, and a sealing gasket 16 assembled in sequence.

[0091] The fabrication process of the lower end plate integral part 1 is as follows:

[0092] The lower end plate 11, the lower end plate insulating plate 12, the lower end plate copper plate 13, and the lower end plate special frame integral part 14 are fastened to the threaded hole on the lower end plate 11 by insulating screws through the positioning holes provided on each component, thus becoming an integral part and being positioned.

[0093] Electrode 15 is attached to the bipolar plate 141 of the special frame integral part of the lower end plate in the electrode 15 groove in the electrode 15 groove of the special frame integral part of the lower end plate by double-sided tape.

[0094] The sealing gasket 16 is attached to the surface of the electrode frame 142 of the special frame of the lower end plate by double-sided tape, or it can be integrally molded on its surface.

[0095] like Figure 3 As shown, the core end plate integrated component 2 includes, in sequence, a core end plate lower side special frame integrated component 21, a core end plate lower side copper plate 22, a core end plate insulating plate 23, a core end plate 24, a core end plate insulating plate 23, a core end plate upper side copper plate 25, a core end plate upper side special frame integrated component 26, an electrode 15, and a sealing gasket 16.

[0096] The fabrication process of the core end plate integral part 2 is as follows:

[0097] The special frame 21 on the lower side of the core end plate, the copper plate 22 on the lower side of the core end plate, the insulating plate 23 on the core end plate, the core end plate 24, the copper plate 25 on the upper side of the core end plate, and the special frame 26 on the upper side of the core end plate are fastened to the threaded hole of the core end plate 24 with insulating screws through the positioning holes provided on each component, thus becoming a whole and being positioned.

[0098] Electrode 15 is attached to the bipolar plate 261 of the special frame integral part 26 on the upper side of the core end plate in the electrode 15 groove by double-sided adhesive tape.

[0099] The sealing gasket 16 is attached to the surface of the special frame electrode frame 262 on the upper side of the core end plate by double-sided tape, or it can be integrally molded on its surface.

[0100] like Figure 4 As shown, the upper end plate integral component 3 includes an upper end plate special frame integral component 31, an upper end plate copper plate 32, an upper end plate insulating plate 33, and an upper end plate 34, which are assembled in sequence.

[0101] The fabrication process of the upper end plate integral part 3 is as follows:

[0102] The upper end plate special frame integral part 31, upper end plate copper plate 32, upper end plate insulating plate 33, and upper end plate 34 are fastened to the threaded hole of the upper end plate 34 with insulating screws through the positioning holes provided on each component to form an integral part and be positioned.

[0103] like Figure 5 As shown, the pre-assembled integrated sealing-electrode-membrane frame welding component 4 includes a membrane frame 41, an ion conduction membrane 42, a membrane frame flow channel cover 43, an electrode 15, and a sealing gasket 16 assembled in sequence.

[0104] The preparation process of the pre-installed integrated component 4 for sealing, electrode, and membrane frame welding is as follows:

[0105] The ion-conducting membrane 42 and the membrane frame 41 are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding. The membrane frame flow channel cover plate 43 is welded into the groove of the membrane frame flow channel cover plate 43 by laser welding or ultrasonic welding, forming an ion membrane-membrane frame welded part.

[0106] Electrode 15 is pre-placed on the ion membrane-membrane frame weldment. Electrode 15 is placed in the groove in the middle of the ion membrane-membrane frame weldment and in the part that contacts the ion conduction membrane 42. Electrode 15 is bonded to the ion conduction membrane 42 by adhesive materials such as double-sided tape.

[0107] The sealing gasket 16 is attached to the surface of the membrane frame 41 by double-sided tape, or it can be integrally molded onto its surface.

[0108] like Figure 6 As shown, the pre-assembled integrated sealing-electrode-plate frame welding component 5 includes a plate frame 51, a bipolar plate 52, a plate frame flow channel cover 53, an electrode 15, and a sealing gasket 16 assembled in sequence.

[0109] The preparation process of the pre-installed integrated component 5 for sealing, electrode, and plate frame welding is as follows:

[0110] The bipolar plate 52 and the plate frame 51 are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding; the plate frame flow channel cover plate 53 is welded into the groove of the plate frame flow channel cover plate 53 by laser welding or ultrasonic welding to form a bipolar plate-plate frame welded part.

[0111] Electrode 15 is pre-placed on the bipolar plate-plate frame welded component. Electrode 15 is placed in the groove in the middle of the bipolar plate-plate frame welded component and in the part that contacts the bipolar plate. Electrode 15 is bonded to the bipolar plate 52 by adhesive materials such as double-sided tape.

[0112] The sealing gasket 16 is attached to the surface of the frame 51 by double-sided tape, or it can be integrally molded onto the surface of the frame.

[0113] like Figure 7 As shown, the lower end plate special frame integral component 14 includes a lower end plate special frame integral component bipolar plate 141, a lower end plate special frame integral component electrode frame 142, and a lower end plate special frame integral component electrode frame flow channel cover plate 143 assembled in sequence.

[0114] The manufacturing process of the special frame integral part 14 of the lower end plate is as follows:

[0115] The bipolar plate 141 and the electrode frame 142 of the special frame of the lower end plate are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding. The flow channel cover plate 143 of the electrode frame of the special frame of the lower end plate is welded into the groove of the flow channel cover plate of the electrode frame 142 by laser welding or ultrasonic welding.

[0116] like Figure 8 As shown, the core end plate underside special frame integral component 21 includes an electrode frame 211 and a bipolar plate 212 assembled with each other.

[0117] The fabrication process of the special frame integral part 21 on the lower side of the core end plate is as follows:

[0118] The electrode frame 211 and the bipolar plate 212, which are special frames integrated on the lower side of the core end plate, are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding.

[0119] like Figure 9 As shown, the core end plate upper special frame integrated component 26 includes a core end plate upper special frame integrated component bipolar plate 261, a core end plate upper special frame integrated component electrode frame 262 and a core end plate upper special frame integrated component electrode frame flow channel cover plate 263 assembled in sequence.

[0120] The fabrication process of the special frame integral part 26 on the upper side of the core end plate is as follows:

[0121] The bipolar plate 261 and the electrode frame 262, which are integral parts of the special frame on the upper side of the core end plate, are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding. The flow channel cover plate 263 of the electrode frame 262 is welded into the groove of the flow channel cover plate of the electrode frame 262 by laser welding or ultrasonic welding.

[0122] like Figure 10 As shown, the upper end plate special frame integral component 31 includes an upper end plate special frame integral component electrode frame 311 and an upper end plate special frame integral component bipolar plate 312 assembled with each other.

[0123] The manufacturing process of the special frame integral part 31 of the upper end plate is as follows:

[0124] The electrode frame 311 and the bipolar plate 312 of the special frame of the upper end plate are welded or bonded together according to the designed assembly structure by means of laser welding or hot melt bonding.

[0125] It should be noted that the aforementioned double-sided adhesive tape must be resistant to strong acids and alkalis, and possess strong oxidation resistance. Furthermore, the adhesive area on the contact surface between electrode 15 and ion-conducting membrane 42 or bipolar plate 52 should account for 3% of the total area.

[0126] The positioning accuracy of each part in the above-mentioned integrated components is ≤2mm;

[0127] Preferably, the positioning accuracy of each part in each integral component is ≤1mm;

[0128] The frames of all the above-mentioned integrated components are made of plastic.

[0129] The frame material of each of the above-mentioned integrated components is selected from PE, PP, and PVC.

[0130] Flow battery stack stacking accuracy: verticality of the entire stack ≤ ±2mm, overlap between integral components ≤ ±0.5mm;

[0131] Preferably, the verticality of the entire stack is ≤ ±1 mm, and the overlap between integral parts is ≤ ±0.3 mm.

[0132] After the above-mentioned integral component is fabricated, the fuel cell stack is assembled and integrated, including the following steps:

[0133] S1: Preparation of fuel cell stack assembly platform, including base plate positioning and leveling;

[0134] S2: Position the lower end plate integral part 1 on the assembly platform;

[0135] S3: Place the pre-installed integrated sealing-electrode-membrane frame welding component 4 and the pre-installed integrated sealing-electrode-plate frame welding component 5 on the assembly platform for positioning and stacking, repeating the steps to ensure positioning accuracy;

[0136] S4: Place the core end plate integral part 2 on the assembly platform for positioning and stacking;

[0137] S5: Place the pre-installed integrated sealing-electrode-membrane frame welding component 4 and the pre-installed integrated sealing-electrode-plate frame welding component 5 on the assembly platform for positioning and stacking, repeating the steps to ensure positioning accuracy;

[0138] S6: Place the upper endplate integral part 3 on the assembly platform for positioning and stacking;

[0139] S7: Insert the screw into the screw hole provided in the above-mentioned component, and provide mold springs on one or both sides of the screw;

[0140] S8: Move the assembly platform to the hydraulic press station and position it. Press it to the limit position using the hydraulic press and tighten the mold spring.

[0141] S9: Perform internal and external leakage tests on the fuel cell stack, in accordance with standard NB / T 11062-2023;

[0142] S10: After the test is completed, the stack will be rotated 90° in the stack turning machine;

[0143] S11: The fuel cell stack is flipped off the production line, completing the assembly.

[0144] The assembly and integration process of the above-mentioned fuel cell stack is completed on a small fully automated fuel cell stack assembly platform. Steps S1-S6 take 15 minutes, steps S7-S8 take 8 minutes, step S9 takes 15 minutes, and steps S10-S11 take 2 minutes.

[0145] Stacking accuracy during fuel cell assembly: verticality of the entire stack is 1mm; overlap between individual components is within ±0.3mm, resulting in high consistency of the fuel cell stack.

[0146] The above description is only a part of the embodiments of this application and is not intended to limit this application in any way. Although this application discloses preferred embodiments as above, it is not intended to limit this application. Any changes or modifications made by those skilled in the art without departing from the scope of the technical solution of this application using the disclosed technical content are equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A flow battery stack, characterized in that, This includes a lower end plate integrated component, a core end plate integrated component, and an upper end plate integrated component, which are assembled by stacking them sequentially. Alternatingly stacked sealing-electrode-membrane frame welding pre-installed components and sealing-electrode-plate frame welding pre-installed components are respectively provided between the core end plate integrated component, the lower end plate integrated component, and the upper end plate integrated component.

2. The flow battery stack according to claim 1, characterized in that, The positioning accuracy of each part in each integrated component is ≤2mm; The positioning accuracy of each part in each integrated component is ≤1mm; The frame of each integrated component is made of plastic. The frame material of each integrated component is selected from PE, PP, and PVC. Flow battery stack stacking accuracy: verticality of the entire stack ≤ ±2mm, overlap between integral components ≤ ±0.5mm; The verticality of the entire stack is ≤ ±1mm, and the overlap between integral parts is ≤ ±0.3mm.

3. The flow battery stack according to claim 2, characterized in that, The lower end plate assembly includes, in sequence, a lower end plate, a lower end plate insulating plate, a lower end plate copper plate, a lower end plate special frame assembly, an electrode, and a sealing gasket.

4. A flow battery stack according to claim 2, characterized in that, The integrated core end plate assembly includes, in sequence, an integrated special frame assembly on the lower side of the core end plate, a copper plate on the lower side of the core end plate, an insulating plate on the core end plate, the core end plate, the insulating plate on the core end plate, an upper copper plate on the core end plate, an integrated special frame assembly on the upper side of the core end plate, an electrode, and a sealing gasket.

5. A flow battery stack according to claim 2, characterized in that, The upper end plate assembly includes, in sequence, an upper end plate special frame assembly, an upper end plate copper plate, an upper end plate insulating plate, and an upper end plate; The upper end plate special frame integral component includes an upper end plate special frame integral component electrode frame and an upper end plate special frame integral component bipolar plate assembled with each other.

6. A flow battery stack according to claim 2, characterized in that, The pre-assembled sealing-electrode-membrane frame assembly includes a membrane frame, an ion-conducting membrane, a membrane frame flow channel cover, an electrode, and a sealing gasket, which are assembled sequentially.

7. A flow battery stack according to claim 2, characterized in that, The pre-assembled integrated sealing-electrode-plate frame welding assembly includes a plate frame, bipolar plate, plate frame flow channel cover, electrode, and sealing gasket assembled sequentially.

8. A flow battery stack according to claim 3, characterized in that, The integrated special frame of the lower end plate includes a bipolar plate, an electrode frame, and a flow channel cover plate of the electrode frame, which are assembled sequentially.

9. A flow battery stack according to claim 4, characterized in that, The integrated special frame on the lower side of the core end plate includes an electrode frame and a bipolar plate assembled together.

10. A flow battery stack according to claim 4, characterized in that, The integrated special frame on the upper side of the core end plate includes a bipolar plate, an electrode frame, and a flow channel cover plate of the electrode frame, which are assembled sequentially.

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