Automatic assembling process and production line for two power battery cover plates

Abstract

The application discloses a one-out-two automatic assembling process and production line for a power battery cover plate. The power battery cover plate comprises a top cover sheet, a plastic sheet, an explosion-proof valve and a pair of pole columns. The plastic sheet is covered on the inner surface of the top cover sheet. The explosion-proof valve is welded at the explosion-proof valve hole of the top cover sheet. The pole column is welded at the pole column hole of the top cover sheet. A pre-compressed sealing ring is arranged between the pole column and the top cover sheet. The one-out-two automatic assembling process comprises the following steps which are sequentially executed: an explosion-proof valve assembling step, a pole column assembling step, a plastic sheet assembling step, an air tightness detection step and a resistance detection step. In the explosion-proof valve assembling step or the pole column assembling step, each carrier carries two top cover sheets to pass through the respective workstations of the explosion-proof valve assembling or the pole column assembling. The two top cover sheets are arranged side by side in the direction perpendicular to the conveying direction. The one-out-two automatic assembling process for the power battery cover plate has high working efficiency.

Description

Technical Field

[0001] This invention relates to the field of power battery manufacturing technology, and in particular to an automated assembly process and production line for a power battery cover plate. Background Technology

[0002] With the rise of the new energy vehicle industry, the research and development and manufacturing technology of power batteries have become the core of the development of new energy vehicles, and the power battery cover is an important component of the power battery. The current assembly process of power battery covers has low production efficiency. For example, Chinese patent CN106356476B discloses an automatic assembly method for power battery covers, which includes the following steps: top cover feeding, flip-over assembly, flip-over airtightness testing, explosion-proof sheet assembly, etc., but only one flip-over assembly and airtightness test can be performed at a time, and only one explosion-proof sheet can be assembled at a time. Summary of the Invention

[0003] To address the aforementioned problems, the purpose of this invention is to provide a fully automated assembly process and production line for power battery cover plates, which features fully automated assembly, high work efficiency, and space-saving operation.

[0004] According to one aspect of the present invention, a one-out-two automatic assembly process for a power battery cover plate is provided. The power battery cover plate includes a top cover plate, a plastic sheet, an explosion-proof valve, and a pair of terminals. The plastic sheet covers the inner surface of the top cover plate. The explosion-proof valve is welded to the explosion-proof valve hole of the top cover plate. The terminals are welded to the terminal hole of the top cover plate. A pre-compressed sealing ring is provided between the terminals and the top cover plate. The one-out-two automatic assembly process includes the following steps executed sequentially: explosion-proof valve assembly step, terminal assembly step, plastic sheet assembly step, airtightness detection step, and resistance detection step.

[0005] In the assembly step of the explosion-proof valve, two explosion-proof valves are simultaneously placed into the explosion-proof valve holes of the two top cover plates and welded together.

[0006] In the electrode assembly step, four electrodes are simultaneously placed into the electrode holes of the two top cover plates and welded together.

[0007] In the plastic sheet assembly step, two plastic sheets are simultaneously covered onto two top cover sheets and ultrasonically welded to form two power battery cover plates.

[0008] In the airtightness testing step, multiple power battery cover plates are tested at once to see if they meet the airtightness requirements.

[0009] In the resistance detection step, multiple terminals of the power battery cover are tested at one time to see if they meet the resistance design requirements.

[0010] In the explosion-proof valve assembly step or the pole assembly step, each carrier carries two top cover plates through each station of the explosion-proof valve assembly or pole assembly, and the two top cover plates are arranged side by side in a direction perpendicular to the conveying direction.

[0011] In a preferred embodiment, the explosion-proof valve assembly step specifically includes:

[0012] S100. Place the two top cover plates onto the carrier. After the carrier moves to the explosion-proof valve feeding mechanism, lift the carrier to accurately position it.

[0013] S101, the two first picking suction heads and the two second picking suction heads move synchronously along the positive y-axis. Each first picking suction head moves to the explosion-proof valve feeding device, and each second picking suction head moves to the top of the corresponding positioning slot. Each first picking suction head and each second picking suction head moves down synchronously to pick up the new explosion-proof valve and the explosion-proof valve that has been positioned in the positioning slot, respectively, and then moves up synchronously to reset.

[0014] S102. Each first picking suction head and each second picking suction head moves synchronously in the opposite direction along the y-axis. Each first picking suction head moves to the top of the corresponding positioning groove, and each second picking suction head moves to the top of the corresponding guide groove. Each first picking suction head and each second picking suction head moves synchronously downward to throw two new explosion-proof valves and two already positioned explosion-proof valves into the corresponding positioning grooves and guide grooves, respectively, and then moves synchronously upward to reset.

[0015] S103. The vehicle carries two top cover plates equipped with explosion-proof valves and moves synchronously to the explosion-proof valve welding mechanism for welding.

[0016] S104. After the welded top cover plate is inspected, it is fed onto the first feeding belt.

[0017] In a more preferred embodiment, the electrode assembly step specifically includes:

[0018] S201. Place the two top cover plates that have undergone the explosion-proof valve assembly step onto the carrier, place the four sealing rings into the pole holes of the two top cover plates, place the four poles into the corresponding pole holes and press them onto the sealing rings, and move the carrier above the lifting module.

[0019] S202, The lifting module lifts the carrier, so that the pressure block presses down on the pole, compressing the sealing ring to the designed compression amount;

[0020] S203, the first welding head moves to weld the part of the pole of the first top cover plate on the next carrier that is not covered by the cantilever to the top cover plate, and the second welding head moves to weld the part of the pole of the second top cover plate on the previous carrier that is not covered by the cantilever to the top cover plate.

[0021] S204. Drive the rotating component to rotate, the cantilever moves away, and the part that was blocked by the cantilever in step S203 is avoided from being blocked. The two welding heads move to weld this part of the pole to the top cover plate.

[0022] S205, the lifting module is reset, causing the welded top cover to disengage from the positioning fixture, and the carrier falls back onto the carrier platform;

[0023] S206. After the two top cover plates on the first carrier are inspected, they are fed onto the second feeding belt. The second carrier moves to the second welding head and repeats steps S203 and S204 to weld the pole of the second top cover plate thereon.

[0024] Furthermore, the plastic sheet assembly step specifically includes:

[0025] S301. The first carrier moves to the first welding module, wherein the ultrasonic welding head of the first welding module is located above the first cover plate to be welded on the first carrier, and the positioning fixture is located below the first cover plate to be welded; at the same time, the second carrier moves to the second welding module, wherein the ultrasonic welding head of the second welding module is located above the second cover plate to be welded on the second carrier, and the positioning fixture is located below the second cover plate to be welded.

[0026] S302, the positioning fixture of the first welding module moves upward and its positioning part passes through the first hollow part of the first carrier until the first cover plate to be welded is lifted off the first carrier; the positioning fixture of the second welding module moves upward and its positioning part passes through the second hollow part of the second carrier until the second cover plate to be welded is lifted off the second carrier; at this time, the two cover plates to be welded are respectively located on the two positioning fixtures so as to accurately position the cover plates to be welded respectively;

[0027] S303, The support plates of the two welding modules are moved to the bottom of the corresponding positioning fixtures to support the positioning fixtures;

[0028] S304. The ultrasonic welding heads of the two welding modules respectively weld the cover plate to be welded.

[0029] S305. After welding is completed, the support plates of the two welding modules are reset and disengaged from the bottom of the corresponding positioning fixture;

[0030] S306. The positioning fixtures of the two welding modules are moved down to the bottom of the corresponding carriers respectively. During this process, the positioning part is disengaged from the corresponding hollow part of the carrier. The cover plate of the first welding module after welding falls back onto the first hollow part of the first carrier, and the cover plate of the second welding module after welding falls back onto the second hollow part of the second carrier.

[0031] Repeat steps S301 to S306, so that the first carrier carries a welded cover plate and a cover plate to be welded to the second welding module to weld the cover plate to be welded on the second hollow part, the second carrier carries two welded cover plates to the next process, and the third carrier carries two cover plates to be welded to the first welding module to weld the cover plate to be welded on the first hollow part.

[0032] In a preferred embodiment, the one-out-of-two automatic assembly process further includes an explosion-proof value detection step prior to the airtightness detection step, wherein the explosion-proof value detection step simultaneously detects whether the explosion-proof valves of multiple power battery cover plates meet the explosion-proof value design requirements.

[0033] In a preferred embodiment, the explosion-proof value detection step specifically includes:

[0034] S401. Move N first lower jigs to the loading position and place N power battery covers on the N first lower jigs, where N is 2 or a multiple of 2;

[0035] S402. Move N first lower jigs directly below N first upper jigs;

[0036] S403. Move N first upper fixtures down so that the first upper fixture and the first lower fixture are closed, the first upper detection cavity forms a sealed cavity, and the first lower detection cavity forms a sealed cavity;

[0037] S404. Inject a set amount of first detection gas into each first upper detection chamber or first lower detection chamber and maintain the pressure for a period of time. Detect the pressure change value in the chamber during this period using a pressure sensor. If the pressure change value is greater than or equal to a set threshold, the product in the corresponding chamber is determined to be unqualified; if the pressure change value is less than the set threshold, the burst value of the product in the corresponding chamber is determined to meet the design requirements.

[0038] In a preferred embodiment, the airtightness testing step specifically includes:

[0039] S501. Place N power battery cover plates into N lower fixtures in a preliminary inspection unit, where N is 2 or a multiple of 2. Close the N upper and lower fixtures of the preliminary inspection unit. Introduce detection gas into the N upper detection chambers of the preliminary inspection unit through a detection gas interface. Detect whether the detection gas leaks into the lower detection chambers using the first mass spectrometer of the preliminary inspection unit. If the first mass spectrometer does not detect the detection gas, the N power battery cover plates are deemed qualified and are processed as good products. If the first mass spectrometer detects the detection gas, the N power battery cover plates are deemed defective and are processed as defective products in the preliminary inspection, and the following steps are continued.

[0040] S502, Re-inspection;

[0041] Step S502 specifically includes:

[0042] S5021. Place the unqualified products from the initial inspection in S501 into the lower fixture of the re-inspection unit. The upper and lower fixtures of the re-inspection unit are closed. Detection gas is introduced into the upper detection chamber through the detection gas interface of the re-inspection unit.

[0043] S5022, the second mass spectrometer interface is connected to one of the lower detection chambers. The second mass spectrometer detects whether the detection gas has leaked into the corresponding lower detection chamber. If the second mass spectrometer does not detect the detection gas, the power battery cover plate in the lower detection chamber is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover plate in the lower detection chamber is deemed unqualified.

[0044] In a preferred embodiment, step S502 further includes:

[0045] S5023. Move the interface of the second mass spectrometer to connect it with the next detection chamber. The second mass spectrometer detects whether the detection gas has leaked into the corresponding lower detection chamber. If the second mass spectrometer does not detect the detection gas, the power battery cover in the next lower detection chamber is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover in the next lower detection chamber is deemed unqualified.

[0046] Repeat step S5023 until all power battery cover plates of the re-inspection unit have been inspected.

[0047] According to another aspect of the present invention, a one-out-two automatic assembly production line for power battery covers adopts the above-mentioned one-out-two automatic assembly process. The one-out-two automatic assembly production line includes an explosion-proof valve welding machine, an electrode welding machine, an ultrasonic welding machine, a gas detection device, and a resistance detection device arranged sequentially. The explosion-proof valve welding machine is connected to the electrode welding machine via a first feeding belt. The electrode welding machine is connected to the ultrasonic welding machine via a second feeding belt. The ultrasonic welding machine is connected to the gas detection device via a third feeding belt. The gas detection device is connected to the resistance detection device via a fourth feeding belt.

[0048] In a preferred embodiment, at least the explosion-proof valve welding machine, the pole welding machine, or the ultrasonic welding machine includes a lifting and positioning mechanism. The explosion-proof valve welding machine, the pole welding machine, or the ultrasonic welding machine includes a carrier carrying two top cover plates, a carrier platform, and a conveying mechanism for moving the carrier platform. The carrier platform has an upwardly extending connecting pin, and the carrier has a connecting groove into which the connecting pin can be detachably inserted. The conveying mechanism includes a slide table capable of moving along the x-axis. The carrier platform has an inner side fixedly connected to the slide table and an outer side suspended in the air. The carrier is placed on the outer side. The outer side has a through hole, and the carrier has a downwardly extending boss that can pass through the through hole to the bottom of the carrier platform. The lifting and positioning mechanism includes a lifting cylinder and a push block driven by the lifting cylinder to move up and down along the z-axis. The push block can press against the boss. The upper surface of the carrier has a positioning guide pin or a positioning guide hole. The positioning guide pin has an inclined conical surface, and the positioning guide hole has an inclined hole wall.

[0049] In a preferred embodiment, the gas detection device includes an air detection mechanism and a helium detection mechanism, which are arranged sequentially.

[0050] The present invention adopts the above solution, which has the following advantages compared with the prior art:

[0051] The automatic assembly process for the power battery cover of this invention allows for simultaneous welding of two explosion-proof valves to two top cover plates at once during explosion-proof valve assembly, simultaneous welding of four terminals to two top cover plates at once during terminal assembly, and simultaneous welding of two plastic sheets to two top cover plates at once during plastic sheet assembly. It also allows for simultaneous detection of whether multiple power battery covers meet airtightness requirements and whether the terminals of multiple power battery covers meet resistance design requirements. This power battery cover assembly process has a high degree of automation and high work efficiency. Attached Figure Description

[0052] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 A perspective view of a one-out-two automated assembly line for a power battery cover according to an embodiment of the present invention;

[0054] Figure 2 This is a schematic diagram of a one-out-two automatic assembly production line for power battery cover plates according to an embodiment of the present invention;

[0055] Figure 3 This is a schematic diagram of the structure of the explosion-proof valve feeding mechanism according to an embodiment of the present invention;

[0056] Figure 4 for Figure 3 A magnified view of a section at point A in the middle;

[0057] Figure 5 for Figure 3 A magnified view of a section at point B in the middle;

[0058] Figure 6 and Figure 7 These are exploded schematic diagrams of the explosion-proof valve feeding mechanism from two different perspectives according to embodiments of the present invention.

[0059] Figure 8 This is a schematic diagram of the pole assembly according to an embodiment of the present invention;

[0060] Figure 9 for Figure 8 The front view shown;

[0061] Figure 10 for Figure 8 The side view shown;

[0062] Figure 11 This is a partial structural schematic diagram of the pole assembly device according to an embodiment of the present invention;

[0063] Figure 12 for Figure 11 The top view shown;

[0064] Figure 13 This is another partial structural schematic diagram of the pole assembly device according to an embodiment of the present invention;

[0065] Figure 14 This is a schematic diagram of the welding avoidance mechanism;

[0066] Figure 15 A 3D diagram of a plastic sheet assembly;

[0067] Figure 16 A three-dimensional view of the vehicle;

[0068] Figure 17 This is another partial structural diagram of the welding module;

[0069] Figure 18 for Figure 17 The main view shown;

[0070] Figure 19 This is a perspective view of two first detection units according to an embodiment of the present invention, one of which is in the feeding state and the other is about to switch to the detection state;

[0071] Figure 20 This is a schematic diagram of the structure of one of the first detection units in the detection state according to an embodiment of the present invention;

[0072] Figure 21 This is a partial structural diagram of the first detection unit;

[0073] Figure 22 This is another partial structural diagram of the first detection unit;

[0074] Figure 23 This is a partial structural diagram of the initial inspection unit;

[0075] Figure 24 This is another partial structural diagram of the initial inspection unit;

[0076] Figure 25 This is a partial structural diagram of the re-inspection unit in the first detection state.

[0077] Figure 26 This is a partial structural diagram of the re-inspection unit in the second inspection state;

[0078] Figure 27 This is another partial structural diagram of the re-inspection unit in the second detection state;

[0079] Figure 28 This is a three-dimensional view of the lower jig;

[0080] Figure 29 This is a schematic diagram of the conveying mechanism.

[0081] in,

[0082] 100. Automated assembly line; 101. Explosion-proof valve welding machine; 102. Electrode welding machine; 103. Ultrasonic welding machine; 104. Gas detection equipment; 105. Resistance testing equipment; 106. First feeding belt; 107. Second feeding belt; 108. Third feeding belt; 109. Fourth feeding belt;

[0083] 1. Power battery cover; 11. Top cover plate; 12. Plastic sheet; 14. Terminal post; 152. Carrier; 1521. Connecting groove; 1522. Boss; 1523. Positioning guide hole; 171. Push block; 172. Pressure sensor; 16. Sealing ring; 18. Through hole; 21. Carrier platform; 211. Connecting pin; 212. Inner side; 22. First hollow part; 23. Second hollow part; 24. Base plate; 241. Positioning guide pin; 242. Conical surface; 25. Lower extension;

[0084] 3. Explosion-proof valve feeding mechanism; 311. Positioning groove; 32. Positioning component; 331. Guide groove; 35. First material suction head; 36. Second material suction head;

[0085] 4. Lifting module; 41. Lifting cylinder; 5. Welding head; 6. Positioning fixture; 61. Pressure block; 611. Connecting shaft; 62. Rotating component; 63. Annular part; 64. Cantilever; 641. Mounting hole; 65. Welding channel; 66. Bearing; 67. Fixture plate; 671. Welding protective gas inlet; 7. Welding avoidance mechanism; 71. Main gear; 72. Driven gear; 73. Avoidance cylinder; 74. Rack;

[0086] 8. Welding module; 81. Ultrasonic welding head; 82. Support plate; 83. Positioning fixture; 831. Positioning part;

[0087] 90. Upper jig; 901. Upper detection chamber; 9. First upper jig; 91. First upper detection chamber; 92. First lower jig; 921. Detection gas inlet; 93. First lower detection chamber; 94. Lower jig; 941. Lower detection chamber; 942. First lower jig; 943. Second lower jig; 944. Third lower jig; 945. Fourth lower jig;

[0088] 200. Initial inspection unit; 201. First mass spectrometer interface; 202. Second slide; 203. Second y-axis guide rail;

[0089] 300. Re-inspection unit; 301. Second mass spectrometer interface; 302. Third mass spectrometer interface; 303. First slide; 305. First y-axis guide rail; 306. y-axis motor; 307. Lead screw; 308. Misalignment cylinder; 309. Lifting cylinder;

[0090] 400. Three-axis moving module; 401. X-axis moving module; 402. Y-axis moving module; 403. Z-axis moving module; 404. Support bracket;

[0091] 500. Conveying mechanism; 501. Slide table. Detailed Implementation

[0092] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more readily understood by those skilled in the art. It should be noted that the description of these embodiments is for the purpose of aiding understanding the present invention, but does not constitute a limitation thereof.

[0093] Reference Figures 1 to 29As shown in this embodiment, the one-out-two automatic assembly process for the power battery cover plate includes a power battery cover plate 1 comprising a top cover plate 11, a plastic sheet 12, an explosion-proof valve, and a pair of terminals 14. The plastic sheet 12 covers the inner surface of the top cover plate 11, the explosion-proof valve is welded to the explosion-proof valve hole of the top cover plate 11, and the terminals 14 are welded to the terminal hole of the top cover plate 11. A pre-compressed sealing ring 16 is provided between the terminals 14 and the top cover plate 11. The one-out-two automatic assembly process includes the following steps executed sequentially: explosion-proof valve assembly step, terminal assembly step, plastic sheet assembly, airtightness testing step, and resistance testing step. In the explosion-proof valve assembly step or the terminal assembly step, each carrier 152 carries two top cover plates 11 through each station of the explosion-proof valve assembly or terminal assembly, and the two top cover plates 11 are arranged side by side in a direction perpendicular to the conveying direction.

[0094] Furthermore, the explosion-proof valve assembly step can utilize known explosion-proof valve assembly equipment, such as the explosion-proof valve assembly equipment for a power battery cover disclosed in Chinese Patent CN115133215A. (Refer to...) Figures 3 to 7 As shown, the specific assembly steps for this explosion-proof valve are as follows:

[0095] S100. Place the two top cover plates onto the carrier 152. After the carrier 152 moves to the explosion-proof valve feeding mechanism 3, lift the carrier 152 to precisely position it. S101. The two first picking suction heads 35 and the two second picking suction heads 36 move synchronously along the positive y-axis. Each first picking suction head 35 moves to the explosion-proof valve feeding device, and each second picking suction head 36 moves above the corresponding positioning slot 311. Each first picking suction head 35 and each second picking suction head 36 moves synchronously downward to pick up the new explosion-proof valve and positioning slot respectively. The explosion-proof valves that have been positioned in the slot 311 are then moved upwards and reset synchronously; S102, each of the first picking suction heads 35 and each of the second picking suction heads 36 move in the opposite direction along the y-axis synchronously, each of the first picking suction heads 35 moves to the top of the corresponding positioning slot 311, and each of the second picking suction heads 36 moves to the top of the corresponding guide slot 331; each of the first picking suction heads 35 and each of the second picking suction heads 36 moves downwards synchronously, throwing two new explosion-proof valves and two explosion-proof valves that have been positioned into the corresponding positioning slot 311 and guide slot 331 respectively, and then move upwards and reset synchronously.

[0096] S103, The carrier carries two top cover plates assembled with explosion-proof valves and moves synchronously to the explosion-proof valve welding machine 101 for welding;

[0097] S104. After the welded top cover plate is inspected, it is fed onto the first feeding belt 106.

[0098] Reference Figures 8 to 14As shown in the figure, this embodiment provides a terminal assembly device for a power battery cover plate, which is used to weld the top cover plate, sealing ring and terminal post of the power battery cover plate semi-finished product together, and at the same time compress the sealing ring to a set compression amount so as to seal the terminal post and the top cover plate.

[0099] The pole assembly device includes a bracket 404, a lifting module 4, a welding head 5, and a positioning clamp 6. The welding head 5 is connected via... Figure 8 The three-axis moving module 400 (x-axis moving module 401, y-axis moving module 402 and z-axis moving module 403) shown is movably mounted on the bracket 404. The positioning pressure 6 is mounted on the bracket 404 and located below the welding head 5. The lifting module 4 is located below the positioning pressure 6 so as to lift the carrier 152 from the carrier platform 21.

[0100] The positioning fixture 6 includes a fixture plate 67, a rotating component 62, and a pressure block 61. The fixture plate 67 has a welding shielding gas inlet 671 and welding shielding gas outlets corresponding to the welding locations to reduce the adverse effects of high temperatures generated during welding on the product and equipment, thus extending the equipment's service life. The rotating component 62 is rotatably mounted on the fixture plate 67 about a rotation axis (extending along the z-axis). The pressure block 61 is used to press against the pole post to compress the sealing ring to the designed compression amount.

[0101] Furthermore, referring to Figure 12 As shown, the rotating component 62 includes an annular portion 63 and a cantilever 64. The cantilever 64 extends from the inner surface of the annular portion 63 to the center, forming a welding channel 65 between the annular portion 63 and the cantilever 64, allowing the welding energy of the welding head 5 to reach the cover plate semi-finished product. The welding channel 65 surrounds more than half of the outer periphery of the pressure block 61. The pressure block 61 is rotatably disposed on the end of the cantilever 64 about the rotation axis. The end of the cantilever 64 is provided with a mounting hole 641. The pressure block 61 has a connecting shaft 611 inserted into the mounting hole 641. A bearing 66 is disposed between the connecting shaft 611 and the hole wall of the mounting hole 641.

[0102] The pole assembly device also includes a welding avoidance mechanism 7 for driving the rotating part 62 to rotate. The welding avoidance mechanism 7 includes a main gear 71, a driven gear 72, and a rack 74. The main gear 71 is driven by a power source to rotate around the z-axis and is mounted on the pressure plate 41 and meshes with the driven gear 72. The driven gear 72 and the annular portion 421 of the rotating part 42 are fixedly connected or integrally formed. When the driven gear 72 rotates, the annular portion 421 and the cantilever 422 rotate accordingly. The power source is an avoidance cylinder 73. The piston rod of the avoidance cylinder 73 is connected to the rack 74, which extends along the x-axis and meshes with the main gear 71.

[0103] Reference Figure 9 and Figure 13As shown, the carrier 152 has a downwardly extending lower extension 25 that can pass through the cutout portion to the area below the carrier platform 21. The lifting module 4 includes a lifting cylinder 41 and a push block 171. The push block 171 is driven by the lifting cylinder 41 and moves along the z-axis. A pressure sensor 172 is provided on the push block 171. During the welding operation, the push block 171 abuts against the lower extension 25.

[0104] The specific steps for assembling the electrode post include:

[0105] S201. Place the two top cover plates 11 that have undergone the explosion-proof valve assembly step onto the carrier 152, place the four sealing rings into the pole holes of the two top cover plates 11, place the four poles 14 into the corresponding pole holes and press them onto the sealing rings, and move the carrier 152 above the lifting module 4.

[0106] S202, the lifting module 4 lifts the carrier 152, so that the pressure block 61 presses down on the pole post 14, and compresses the sealing ring to the designed compression amount;

[0107] S203, the first welding head 3 moves to weld the part of the pole of the first top cover plate 11 on the next carrier 2 that is not covered by the cantilever 64 to the top cover plate, and the second welding head 3 moves to weld the part of the pole of the second top cover plate on the previous carrier 152 that is not covered by the cantilever 64 to the top cover plate 11.

[0108] S204. Drive the rotating part 62 to rotate, the cantilever 64 moves away, and the part that was blocked by the cantilever 64 in step S203 is avoided from being blocked. The two welding heads 3 move to weld this part of the pole post 14 to the top cover plate 11.

[0109] S205, the lifting module 4 is reset, causing the welded top cover plate 11 to disengage from the positioning pressure 6, and the carrier 152 falls back onto the carrier platform 21.

[0110] S206. After inspection, the two top cover plates 11 on the first carrier 152 are fed onto the second feeding belt 107. The second carrier 152 moves to the second welding head and repeats steps S203 and S204 to weld the pole post 14 of the second top cover plate 11 on it.

[0111] More specifically, in step S202, the lifting cylinder 41 in the lifting module 4 drives the push block 171 to move upward. The push block 171 abuts against the lower extension 25, and the lower extension 25 moves upward. The carrier 152 is lifted from the carrier platform 21, and the pole is facing the pressure block 61. The pressure sensor 172 on the push block 171 of the lifting module 4 detects the pressure on the carrier 152. When the pressure reaches the set value, the push block 171 stops lifting. In step S204, the avoidance cylinder 73 and the rack 74 drive the main gear 71 to rotate. The main gear 71 and the driven gear 72 mesh, and the rotating part 62 can rotate. The cantilever 64 moves away, and the part blocked by the cantilever 64 gradually moves out of the underside of the cantilever 64, thereby avoiding the obstruction. The cantilever 64 changes from the first position to the second position. During the process of changing from the first position to the second position, the welding head 5 moves synchronously through the three-axis moving module 400 to complete the welding of the unwelded part.

[0112] This electrode assembly device can automatically weld the electrode and compress the sealing ring, while having a compact structure and occupying little space.

[0113] Reference Figures 15 to 18 As shown, the plastic sheet assembly step can employ a known ultrasonic welding positioning device for power battery covers, such as the ultrasonic welding positioning device for power battery covers disclosed in Chinese Patent CN115041805A. The plastic sheet assembly step specifically includes:

[0114] S301, the first carrier 152 moves to the first welding module 8, wherein the ultrasonic welding head 81 of the first welding module 8 is located above the first cover plate 1 to be welded on the first carrier 152, and the positioning fixture 83 is located below the first cover plate 1 to be welded; at the same time, the second carrier 152 moves to the second welding module 8, wherein the ultrasonic welding head 81 of the second welding module 8 is located above the second cover plate 1 to be welded on the second carrier 152, and the positioning fixture 83 is located below the second cover plate 1 to be welded;

[0115] S302, the positioning fixture 83 of the first welding module 8 moves upward and its positioning part 831 passes through the first hollow part 22 of the first carrier 152 until the first cover plate 1 to be welded is lifted off the first carrier 152; the positioning fixture 83 of the second welding module 8 moves upward and its positioning part 831 passes through the second hollow part 22 of the second carrier 152 until the second cover plate 1 to be welded is lifted off the second carrier 152; at this time, the two cover plates 1 to be welded are respectively located on the two positioning fixtures 83, so as to accurately position the cover plates 1 to be welded respectively;

[0116] S303, the support plates 82 of the two welding modules 8 are moved to the bottom of the corresponding positioning fixtures 83 to support the positioning fixtures 83.

[0117] S304. The ultrasonic welding heads 81 of the two welding modules respectively weld the cover plate 1 to be welded.

[0118] S305. After welding is completed, the support plates 82 of the two welding modules 8 are reset and disengaged from the bottom of the corresponding positioning fixture 83.

[0119] S306, the positioning fixtures 83 of the two welding modules 8 are moved down to the bottom of the corresponding carriers 152 respectively. During this process, the positioning part 831 is disengaged from the corresponding hollow part of the carrier 152. The cover plate 1 after welding of the first welding module 8 falls back onto the first hollow part 22 of the first carrier 152, and the cover plate after welding of the second welding module 8 falls back onto the second hollow part 23 of the second carrier 152.

[0120] Repeat steps S301 to S306, so that the first carrier carries a welded cover plate 1 and a cover plate 1 to be welded to the second welding module 8 to weld the cover plate 1 to be welded on the second hollow part 23. The second carrier carries two welded cover plates 1 to the next process, while the third carrier carries two cover plates 1 to be welded to the first welding module 8 to weld the cover plate 1 to be welded on its first hollow part 22.

[0121] This embodiment can simultaneously weld two battery cover plates, resulting in high work efficiency.

[0122] Reference Figures 19 to 22 As shown, this one-out-of-two automated assembly process also includes an explosion-proof value testing step prior to the airtightness testing step. The explosion-proof value testing step simultaneously checks whether the explosion-proof valves of multiple power battery covers meet the explosion-proof value design requirements. The explosion-proof value testing step specifically includes:

[0123] S401. Move the four first lower jigs 92 to the loading position and place the four power battery covers on the four first lower jigs 92.

[0124] S402, Move the four first lower jigs 92 directly below the four first upper jigs 9;

[0125] S403. Move the four first upper fixtures 9 down so that the first upper fixtures 9 and the first lower fixtures 92 are closed, the first upper detection cavity 91 forms a sealed cavity, and the first lower detection cavity 93 forms a sealed cavity.

[0126] S404. A set amount of first detection gas is injected into each of the first upper detection chamber 91 or the first lower detection chamber 93 and the pressure is maintained for a period of time. The pressure change value in the chamber during this period is detected by the pressure sensor. If the pressure change value is greater than or equal to the set threshold, the product in the corresponding chamber is determined to be unqualified. If the pressure change value is less than the set threshold, the burst value of the product in the corresponding chamber is determined to meet the design requirements.

[0127] More specifically, in step S401, the first lower fixture 92 moves to the waiting position and places multiple power battery cover plates 1 into multiple first lower fixtures 92. The multiple first lower fixtures 92 move synchronously to the corresponding detection position (idle detection position). The first lower fixture 92 and the first upper fixture 9 close the mold to detect whether the burst value of the product meets the design requirements. After the detection is completed, the first upper fixture 9 is lifted and the first lower fixture 92 moves to the waiting position to unload the product.

[0128] In this embodiment, each first detection unit detects four power battery covers at a time, resulting in high work efficiency. After the power battery cover is placed on the first lower fixture 92, the first upper fixture 9 and the first lower fixture 92 are closed to clamp the power battery cover between them. The power battery cover separates the first upper detection chamber 91 and the first lower detection chamber 93. Then, air is injected into the first upper detection chamber 91 and pressure is maintained. The air pressure change value during this period can be obtained by the air pressure sensor to determine whether the product is qualified. After the detection is completed, the first upper fixture 9 is moved upward along the z-axis to unload the product for the next detection step.

[0129] The airtightness of the power battery cover 200 directly affects the performance and use of the finished product. Airtightness testing includes... Figure 23 and Figure 24 The initial inspection unit shown and Figures 25 to 28 The re-inspection unit shown.

[0130] Furthermore, each preliminary detection unit 200 includes a first mass spectrometer interface 201 and a first mass spectrometer connected to the first mass spectrometer interface 201. When the preliminary detection unit 200 is in detection mode, the first mass spectrometer interface 201 and each lower detection chamber 941 of the preliminary detection unit 200 are connected.

[0131] Each preliminary inspection unit 200 also includes a second slide 202 that moves along the y-axis. The second slide 202 is movably mounted on the second y-guide rail 203 and is driven to move by the y-motor 306 via the lead screw 307. In each preliminary inspection unit 200, four lower fixtures 94 are mounted on one second slide 202. Each lower fixture 94 has a detection gas inlet 921 that communicates with the lower detection chamber 941. A detection gas outlet is provided on the lower surface of the second slide 202. The detection gas outlet communicates with all the detection gas inlets 921 of the preliminary inspection unit 200. When the preliminary inspection unit 200 is in the detection state, the detection gas outlet is connected to the first mass spectrometer interface 201.

[0132] The initial inspection unit 200 also includes a lifting cylinder 309, which drives the first mass spectrometer interface 201 to move along the z-axis. In the detection state, the first mass spectrometer interface 201 and the second slide 202 are in close contact, with the detection gas outlet and the first mass spectrometer interface 201 connected. In the loading state, the first mass spectrometer interface 201 is lower than the second slide 202. Sealing rings are provided on the first mass spectrometer interface 201 and the second slide 202 to achieve a seal.

[0133] The re-inspection unit 300 includes a second mass spectrometer interface 301 and a third mass spectrometer interface 302. The second mass spectrometer interface 301 is connected to the second mass spectrometer, and the third mass spectrometer interface 302 is connected to the third mass spectrometer.

[0134] Reference Figure 25 and Figure 27 As shown, the detection states of the re-inspection unit 300 include at least a first detection state and a second detection state. In the first detection state, the two lower detection cavities 941 of the re-inspection unit 300 are connected in a one-to-one correspondence with the second mass spectrometer interface 301 and the third mass spectrometer interface 302. In the second detection state, the other two lower detection cavities 941 of the re-inspection unit 300 are connected in a one-to-one correspondence with the second mass spectrometer interface 301 and the third mass spectrometer interface 302.

[0135] Furthermore, the re-inspection unit 300 also includes a first slide block 303 movable along the y-axis. The first slide block 303 is movably mounted on a first y-axis guide rail 305 and driven to move by a y-axis motor 306 via a lead screw 307. The four lower fixtures 94 of the re-inspection unit 300 are mounted on the first slide block 303. (Combined with...) Figure 28 As shown, each lower fixture 94 of the re-inspection unit 300 has a detection gas inlet 921 communicating with the lower detection chamber 941. The lower surface of the first slide 303 has multiple detection gas outlets spaced along the x-axis, with each detection gas inlet 921 corresponding to and communicating with one detection gas outlet. In the first detection state, the two detection gas outlets of the re-inspection unit 300 are connected to the second mass spectrometer interface 301 and the third mass spectrometer interface 302 in a one-to-one correspondence. In the second detection state, the other two detection gas outlets of the re-inspection unit 300 are connected to the second mass spectrometer interface 301 and the third mass spectrometer interface 302 in a one-to-one correspondence.

[0136] More specifically, the re-inspection unit 300 in such... Figure 25 In the first detection state shown, the detection gas outlet of the first lower fixture 942 of the re-inspection unit 300 and the second mass spectrometer interface 301 are connected, and the detection gas outlet of the third lower fixture 944 and the third mass spectrometer interface 302 are connected; the re-inspection unit 300 is in the following state: Figure 26In the second detection state shown, the detection gas outlet of the second lower fixture 943 of the re-inspection unit 300 and the second mass spectrometer interface 301 are connected, and the detection gas outlet of the fourth lower fixture 945 and the third mass spectrometer interface 302 are connected.

[0137] The second mass spectrometer interface 301 and the third mass spectrometer interface 302 are movable along the x-axis. The re-inspection unit 300 also includes a misalignment cylinder 308 and a lifting cylinder 309. The misalignment cylinder 308 drives the second mass spectrometer interface 301 and the third mass spectrometer interface 302 to move along the x-axis, and the lifting cylinder 309 drives the second mass spectrometer interface 301 and the third mass spectrometer interface 302 to move along the z-axis. Under the action of the lifting cylinder 309, in the detection state, the second mass spectrometer interface 301 and the third mass spectrometer interface 302 are in close contact with the first slide 303. In the loading state, the second mass spectrometer interface 301 and the third mass spectrometer interface 302 are lower than the first slide 303. Sealing rings are provided on the second mass spectrometer interface 301, the third mass spectrometer interface 302, and the first slide 303.

[0138] The specific steps for airtightness testing include:

[0139] S501. Place four power battery cover plates into four lower fixtures in a preliminary inspection unit. The four upper fixtures 90 and lower fixtures 94 of the preliminary inspection unit are closed. Detection gas is introduced into the four upper detection chambers 901 of the preliminary inspection unit through a detection gas interface. The first mass spectrometer of the preliminary inspection unit 4 detects whether the detection gas leaks into the lower detection chamber 941. If the first mass spectrometer does not detect the detection gas, the four power battery cover plates are deemed to be qualified and are processed as good products. If the first mass spectrometer detects the detection gas, the four power battery cover plates are deemed to be defective and are processed as defective products in the preliminary inspection. The following steps are then performed.

[0140] S502, Re-inspection;

[0141] Step S502 specifically includes:

[0142] S5021. Place the unqualified products from the initial inspection in S501 into the lower fixture 94 of the re-inspection unit 5. The upper fixture 90 and the lower fixture 94 of the re-inspection unit 5 are closed. Detection gas is introduced into the upper detection chamber 901 through the detection gas interface of the re-inspection unit 5.

[0143] S5022, the second mass spectrometer interface 301 is connected to one of the lower detection chambers 941. The second mass spectrometer detects whether the detection gas has leaked into the corresponding lower detection chamber 941. If the second mass spectrometer does not detect the detection gas, the power battery cover plate in the lower detection chamber 941 is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover plate in the lower detection chamber 941 is deemed unqualified.

[0144] Furthermore, multiple initial inspection units 200 simultaneously execute step S501;

[0145] More specifically, in step S5022, the third mass spectrometer interface 302 is connected to another lower detection chamber 941. The third mass spectrometer detects whether the corresponding lower detection chamber 941 has leaked detection gas. If the third mass spectrometer does not detect the detection gas, the power battery cover plate in the other lower detection chamber 941 is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover plate in the other lower detection chamber 941 is deemed unqualified.

[0146] Step S502 also includes:

[0147] S5023. Move the second mass spectrometer interface 301 to connect it with the next detection chamber. The second mass spectrometer detects whether the detection gas has leaked into the corresponding lower detection chamber. If the second mass spectrometer does not detect the detection gas, the power battery cover in the next lower detection chamber is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover in the next lower detection chamber is deemed unqualified.

[0148] Repeat step S5023 until all power battery cover plates in the re-inspection unit have been inspected. In step S5023, qualified products are unloaded through the unloading station, while unqualified products are placed on the helium-inspection defective product conveyor line.

[0149] In this embodiment, the initial inspection unit 200 uses a mass spectrometer and a helium source to detect four products. The two mass spectrometers in the re-inspection unit 300 work simultaneously, allowing for the re-inspection of two products at a time. This saves on the mass spectrometer and helium valve, thus saving costs while ensuring efficiency. Furthermore, the mass spectrometer in this embodiment is placed vertically, reducing the floor space required and facilitating disassembly.

[0150] Reference Figure 1 and Figure 2 As shown in the figure, this embodiment also provides a one-to-two automatic assembly line 100 for power battery cover plates. The line is 21.5 meters long and 4.5 meters wide, and occupies a relatively small area under the same production capacity.

[0151] Furthermore, the production line 100 includes, in sequence, an explosion-proof valve welding machine 101, an electrode welding machine 102, an ultrasonic welding machine 103, a gas detection device 104, and a resistance detection device 105. The gas detection device 104 includes an air detection mechanism and a helium detection mechanism, which are arranged sequentially and operate synchronously. The resistance detection device 105 adopts the automatic battery cover detection device disclosed in Chinese Patent CN113716149A. The explosion-proof valve welding machine 101 is connected to the electrode welding machine 102 via a first feeding belt 106. The electrode welding machine 102 is connected to the ultrasonic welding machine 103 via a second feeding belt 107. The ultrasonic welding machine 103 is connected to the gas detection device via a third feeding belt 108. The gas detection device 104 is connected to the resistance detection device 105 via a fourth feeding belt 109.

[0152] Furthermore, referring to Figure 6 , Figure 7 and Figure 29 As shown, at least the explosion-proof valve welding machine 101, pole welding machine 102, or ultrasonic welding machine 103 includes a lifting and positioning mechanism, and the explosion-proof valve welding machine 101, pole welding machine 102, or ultrasonic welding machine 103 includes a carrier 152 carrying two top cover plates 11, a carrier platform 21, and a conveying mechanism 500 for moving the carrier platform 21.

[0153] The carrier platform 21 has an upwardly extending connecting pin 211, and the carrier 152 has a connecting groove 1521, into which the connecting pin 211 can be detachably inserted. The conveying mechanism 500 includes a slide 501 movable along the x-axis. The carrier platform 21 has an inner portion 212 fixedly connected to the slide 501 and an outer portion suspended in the air. The carrier 152 is placed on the outer portion. A through hole 18 is provided on the outer portion, and the carrier 152 has a boss 1522 extending downward through the through hole 18 to the bottom of the carrier platform 21. The lifting and positioning mechanism also includes a lifting cylinder 41 and a push block 171 driven by the lifting cylinder 41 to move up and down along the z-axis. The push block 171 can press against the boss 1522. A positioning guide hole 1523 is provided on the upper surface of the carrier 152, and the positioning guide hole 1523 has an inclined hole wall. The lifting and positioning mechanism also includes a reference plate 24, on which multiple positioning guide pins 241 are provided. Each positioning guide pin 241 has an inclined conical surface 242. When the carrier 152 is detected to be below the reference plate 24, the lifting cylinder 41 drives the push block 171 to push the boss 1522 upward, lifting the carrier 152 and causing the positioning guide pins 241 to be inserted into the positioning guide holes 1523 for precise positioning.

[0154] The automated assembly process for the power battery cover plates described in this implementation involves several steps. In the explosion-proof valve assembly step, two explosion-proof valves are simultaneously placed and welded to the explosion-proof valve holes of the two top cover plates in one operation. In the terminal post assembly step, four terminals are simultaneously placed and welded to the terminal post holes of the two top cover plates in one operation. In the plastic sheet assembly step, two plastic sheets are simultaneously applied to the two top cover plates and ultrasonically welded to form two power battery cover plates. The airtightness testing step checks whether multiple power battery cover plates meet airtightness requirements in one operation. The resistance testing step checks whether the terminals of multiple power battery cover plates meet resistance design requirements in one operation, resulting in high work efficiency.

[0155] As indicated in this specification and claims, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, and these steps and elements do not constitute an exclusive list; the method or apparatus may also include other steps or elements. The term "and / or" as used herein includes any combination of one or more of the associated listed items.

[0156] It should be noted that, unless otherwise specified, when a feature is referred to as "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature, or indirectly fixed or connected to the other feature. Furthermore, the descriptions of "upper," "lower," "left," and "right" used in this invention are only relative to the relative positional relationships of the various components of the invention in the accompanying drawings, which can be referred to in the drawings. Figure 1 .

[0157] It can be further understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0158] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0159] The above embodiments are merely illustrative of the technical concept and features of the present invention, and are preferred embodiments. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and they should not be construed as limiting the scope of protection of the present invention. All equivalent transformations or modifications made according to the principles of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A two-out-of-one automatic assembly process for a power battery cover plate, the power battery cover plate comprising a top cover sheet, a plastic sheet, a burst valve and a pair of pole posts, the plastic sheet being covered on an inner surface of the top cover sheet, the burst valve being welded at a burst valve hole of the top cover sheet, the pole posts being welded at pole post holes of the top cover sheet, and a pre-compressed sealing ring being arranged between the pole posts and the top cover sheet, characterized in that, The one-out-two automatic assembly process includes the following steps executed sequentially: explosion-proof valve assembly, pole assembly, plastic sheet assembly, airtightness testing, and resistance testing. In the assembly step of the explosion-proof valve, two explosion-proof valves are simultaneously placed into the explosion-proof valve holes of the two top cover plates and welded together. In the electrode assembly step, four electrodes are simultaneously placed into the electrode holes of the two top cover plates and welded together. In the plastic sheet assembly step, two plastic sheets are simultaneously covered onto two top cover sheets and ultrasonically welded to form two power battery cover plates. In the airtightness testing step, multiple power battery cover plates are tested at once to see if they meet the airtightness requirements. In the resistance detection step, multiple terminals of the power battery cover are tested at one time to see if they meet the resistance design requirements. In the explosion-proof valve assembly step or the pole assembly step, each carrier carries two top cover plates through each station of the explosion-proof valve assembly or pole assembly, and the two top cover plates are arranged side by side in a direction perpendicular to the conveying direction.

2. The one-in-two automatic assembly process of the power battery cover plate according to claim 1, wherein The specific steps for assembling the explosion-proof valve include: S100. Place the two top cover plates onto the carrier. After the carrier moves to the explosion-proof valve feeding mechanism, lift the carrier to accurately position it. S101, the two first picking suction heads and the two second picking suction heads move synchronously along the positive y-axis. Each first picking suction head moves to the explosion-proof valve feeding device, and each second picking suction head moves to the top of the corresponding positioning slot. Each first picking suction head and each second picking suction head moves down synchronously to pick up the new explosion-proof valve and the explosion-proof valve that has been positioned in the positioning slot, respectively, and then moves up synchronously to reset. S102. Each first picking suction head and each second picking suction head moves synchronously in the opposite direction along the y-axis. Each first picking suction head moves to the top of the corresponding positioning groove, and each second picking suction head moves to the top of the corresponding guide groove. Each first picking suction head and each second picking suction head moves synchronously downward to throw two new explosion-proof valves and two already positioned explosion-proof valves into the corresponding positioning grooves and guide grooves, respectively, and then moves synchronously upward to reset. S103. The vehicle carries two top cover plates equipped with explosion-proof valves and moves synchronously to the explosion-proof valve welding machine for welding. S104. After the welded top cover plate is inspected, it is fed onto the first feeding belt.

3. The one-in-two automatic assembly process of the power battery cover plate according to claim 1, wherein, The electrode assembly steps specifically include: S201. Place the two top cover plates that have undergone the explosion-proof valve assembly step onto the carrier, place the four sealing rings into the pole holes of the two top cover plates, place the four poles into the corresponding pole holes and press them onto the sealing rings, and move the carrier above the lifting module. S202, The lifting module lifts the carrier, so that the pressure block presses down on the pole, compressing the sealing ring to the designed compression amount; S203, the first welding head moves to weld the part of the pole of the first top cover plate on the next carrier that is not covered by the cantilever to the top cover plate, and the second welding head moves to weld the part of the pole of the second top cover plate on the previous carrier that is not covered by the cantilever to the top cover plate. S204. Drive the rotating component to rotate, the cantilever moves away, and the part that was blocked by the cantilever in step S203 is avoided from being blocked. The two welding heads move to weld this part of the pole to the top cover plate. S205, the lifting module is reset, causing the welded top cover to disengage from the positioning fixture, and the carrier falls back onto the carrier platform; S206. After the two top cover plates on the first carrier are inspected, they are fed onto the second feeding belt. The second carrier moves to the second welding head and repeats steps S203 and S204 to weld the pole of the second top cover plate thereon.

4. The one-in-two automatic assembly process of the power battery cover plate according to claim 1, wherein, The plastic sheet assembly steps specifically include: S301. The first carrier moves to the first welding module, wherein the ultrasonic welding head of the first welding module is located above the first cover plate to be welded on the first carrier, and the positioning fixture is located below the first cover plate to be welded; at the same time, the second carrier moves to the second welding module, wherein the ultrasonic welding head of the second welding module is located above the second cover plate to be welded on the second carrier, and the positioning fixture is located below the second cover plate to be welded. S302, the positioning fixture of the first welding module moves upward and its positioning part passes through the first hollow part of the first carrier until the first cover plate to be welded is lifted off the first carrier; the positioning fixture of the second welding module moves upward and its positioning part passes through the second hollow part of the second carrier until the second cover plate to be welded is lifted off the second carrier; at this time, the two cover plates to be welded are respectively located on the two positioning fixtures so as to accurately position the cover plates to be welded respectively; S303, The support plates of the two welding modules are moved to the bottom of the corresponding positioning fixtures to support the positioning fixtures; S304. The ultrasonic welding heads of the two welding modules respectively weld the cover plate to be welded. S305. After welding is completed, the support plates of the two welding modules are reset and disengaged from the bottom of the corresponding positioning fixture; S306. The positioning fixtures of the two welding modules are moved down to the bottom of the corresponding carriers respectively. During this process, the positioning part is disengaged from the corresponding hollow part of the carrier. The cover plate of the first welding module after welding falls back onto the first hollow part of the first carrier, and the cover plate of the second welding module after welding falls back onto the second hollow part of the second carrier. Repeat steps S301 to S306, so that the first carrier carries a welded cover plate and a cover plate to be welded to the second welding module to weld the cover plate to be welded on the second hollow part, the second carrier carries two welded cover plates to the next process, and the third carrier carries two cover plates to be welded to the first welding module to weld the cover plate to be welded on the first hollow part.

5. The one-in-two automatic assembly process of the power battery cover plate according to claim 1, wherein, The one-out-of-two automatic assembly process also includes an explosion-proof value detection step located before the airtightness detection step. In the explosion-proof value detection step, the explosion-proof valves of multiple power battery cover plates are simultaneously detected to see if they meet the explosion-proof value design requirements.

6. The one-in-two automatic assembly process of the power battery cover plate according to claim 5, wherein, The explosion-proof value detection steps specifically include: S401. Move N first lower jigs to the loading position and place N power battery covers on the N first lower jigs, where N is 2 or a multiple of 2; S402. Move N first lower jigs directly below N first upper jigs; S403. Move N first upper fixtures down so that the first upper fixture and the first lower fixture are closed, the first upper detection cavity forms a sealed cavity, and the first lower detection cavity forms a sealed cavity; S404. Inject a set amount of first detection gas into each first upper detection chamber or first lower detection chamber and maintain the pressure for a period of time. Detect the pressure change value in the chamber during this period using a pressure sensor. If the pressure change value is greater than or equal to a set threshold, the product in the corresponding chamber is determined to be unqualified; if the pressure change value is less than the set threshold, the burst value of the product in the corresponding chamber is determined to meet the design requirements.

7. The one-in-two automatic assembly process of the power battery cover plate according to claim 1, wherein, The airtightness testing steps specifically include: S501. Place N power battery cover plates into N lower fixtures in a preliminary inspection unit, where N is 2 or a multiple of 2. Close the N upper and lower fixtures of the preliminary inspection unit. Introduce detection gas into the N upper detection chambers of the preliminary inspection unit through a detection gas interface. Detect whether the detection gas leaks into the lower detection chambers using the first mass spectrometer of the preliminary inspection unit. If the first mass spectrometer does not detect the detection gas, the N power battery cover plates are deemed qualified and are processed as good products. If the first mass spectrometer detects the detection gas, the N power battery cover plates are deemed defective and are processed as defective products in the preliminary inspection, and the following steps are continued. S502, Re-inspection; Step S502 specifically includes: S5021. Place the unqualified products from the initial inspection in S501 into the lower fixture of the re-inspection unit. The upper and lower fixtures of the re-inspection unit are closed. Detection gas is introduced into the upper detection chamber through the detection gas interface of the re-inspection unit. S5022, the second mass spectrometer interface is connected to one of the lower detection chambers. The second mass spectrometer detects whether the detection gas has leaked into the corresponding lower detection chamber. If the second mass spectrometer does not detect the detection gas, the power battery cover plate in the lower detection chamber is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover plate in the lower detection chamber is deemed unqualified.

8. The automatic assembly process for the power battery cover plate according to claim 7, characterized in that, Step S502 also includes: S5023. Move the interface of the second mass spectrometer to connect it with the next detection chamber. The second mass spectrometer detects whether the detection gas has leaked into the corresponding lower detection chamber. If the second mass spectrometer does not detect the detection gas, the power battery cover in the next lower detection chamber is deemed qualified and is processed as a good product. If the second mass spectrometer detects the detection gas, the power battery cover in the next lower detection chamber is deemed unqualified. Repeat step S5023 until all power battery cover plates of the re-inspection unit have been inspected.

9. A two-out-of-one automatic assembly production line for power battery cover plates, characterized in that, The one-out-two automatic assembly process as described in any one of claims 1 to 8 is adopted. The one-out-two automatic assembly production line includes an explosion-proof valve welding machine, an electrode welding machine, an ultrasonic welding machine, a gas detection device, and a resistance detection device arranged in sequence. The explosion-proof valve welding machine is connected to the electrode welding machine via a first feeding belt. The electrode welding machine is connected to the ultrasonic welding machine via a second feeding belt. The ultrasonic welding machine is connected to the gas detection device via a third feeding belt. The gas detection device is connected to the resistance detection device via a fourth feeding belt.

10. The one-out-of-two automatic assembly production line according to claim 9, characterized in that, At least the explosion-proof valve welding machine, the pole welding machine, or the ultrasonic welding machine includes a lifting and positioning mechanism. The explosion-proof valve welding machine, the pole welding machine, or the ultrasonic welding machine includes a carrier carrying two top cover plates, a carrier platform, and a conveying mechanism for moving the carrier platform. The carrier platform has an upwardly extending connecting pin, and the carrier has a connecting groove into which the connecting pin can be detachably inserted. The conveying mechanism includes a slide table capable of moving along the x-axis. The carrier platform has an inner side fixedly connected to the slide table and an outer side suspended in the air. The carrier is placed on the outer side. The outer side has a through hole, and the carrier has a downwardly extending boss that can pass through the through hole to the bottom of the carrier platform. The lifting and positioning mechanism includes a lifting cylinder and a push block driven by the lifting cylinder to move up and down along the z-axis. The push block can press against the boss. The upper surface of the carrier has a positioning guide pin or a positioning guide hole. The positioning guide pin has an inclined conical surface, and the positioning guide hole has an inclined hole wall.

11. The one-out-of-two automatic assembly production line according to claim 9, characterized in that, The gas detection equipment includes an air detection mechanism and a helium detection mechanism, which are arranged sequentially.

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