A module stacking workstation and stacking quality control method

Abstract

The present invention relates to a module stacking workstation and a stacking quality control method, comprising: a robot B, a shaping workbench, a fastening and riveting workbench, and a safety test bench; the robot B is used to complete tests on the polarity, open-circuit voltage, AC internal resistance and self-discharge rate of the battery cells when grabbing the battery cells, so as to ensure that the quality of the incoming materials can be controlled before assembly; the shaping workbench is used to perform side and top surface shaping on the stacked battery modules, and to control the shaping quality; the fastening and riveting workbench is used to automatically perform the tightening process, with dual control of torque and angle; the safety test bench is used to automatically perform safety testing on the stacked assemblies; the module stacking quality control method comprises battery cell sorting; module stacking; module shaping; tightening and riveting; and safety testing; the present invention has high production efficiency and meets 100% detection and quality control requirements for key processing data; realizes an island layout of the equipment, and the process is self-enclosed, and can quickly achieve capacity improvement through station replication without affecting the production process.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy power battery manufacturing, and relates to a module stacking workstation and a stacking quality control method. Background Art

[0002] The square module is one of the commonly used battery structures for electric vehicles. It has the advantages of simple grouping, high volume utilization, and convenient thermal management. Therefore, it has a high market share. The conventional square module should contain the following parts, and its structure is as follows: Figure 1 As shown:

[0003] 1) Battery cells

[0004] 2) Cell spacer materials (aerogel pads, air duct plates, structural adhesives, etc.)

[0005] 3) Side panels

[0006] 4) End plate

[0007] 5) Sampling circuit (integrated circuit board (PCB), flexible sampling circuit (FPC))

[0008] 6) Wire harness isolation plate

[0009] 7) Busbar (aluminum busbar, copper busbar)

[0010] 8) Module cover

[0011] 9) Bottom insulation film

[0012] 10) Output pole base

[0013] 11) Output pole protection cover

[0014] Module stacking is one of the key processes in square module manufacturing. It is a process in which battery cells, aerogel pads (or air ducts), side panels, end panels, wiring harness isolation panels, insulating sheets and other parts are stacked into groups in the direction and sequence specified in the design, and then extruded to the specified size after shaping. The side panels and end panels are fixed by welding or screwing to form a semi-finished product with a compact structure and appropriate size.

[0015] The process and processing equipment of traditional automated module production lines are shown in the following table:

[0016]

[0017] In traditional module production lines of battery companies, the module stacking section is designed as a long strip layout, with each processing station connected by a conveyor roller. Figure 2 This is the traditional layout diagram:

[0018] This plan has a loose equipment layout, making it difficult to increase subsequent production capacity. The transformation process has a great impact on normal production, which is not conducive to the transformation.

[0019] CN111384427A relates to the field of power battery production, particularly a power battery module stacking device and method. The power battery module stacking device includes a turntable mechanism for switching workstations, and at least one stacking fixture disposed on the turntable mechanism. The turntable mechanism drives the stacking fixture to rotate between a first cover plate loading station, a small module loading station, and a second cover plate loading station. The first cover plate loading station is provided with a first cover plate buffer mechanism and a first cover plate loading mechanism. The small module loading station is provided with a small module feeding production line and a small module loading mechanism. The second cover plate loading station is provided with a second cover plate buffer mechanism and a second cover plate loading mechanism. The coordination of the small module loading mechanism, the first cover plate loading mechanism, the second cover plate loading mechanism, the turntable mechanism, and the stacking fixture enables the stacking of power battery modules, effectively improving work efficiency.

[0020] CN113363685A provides a module stacking device and method, relating to the field of battery manufacturing technology. The device includes a workbench and an insulating mechanism. The workbench is used to place a battery module, wherein the battery module has multiple tabs on at least one side in a first direction, and the multiple tabs are arranged along a second direction. The insulating mechanism is connected to the workbench and is used to insert multiple insulating members into the multiple tabs along a third direction, so that an insulating member is provided between every two adjacent tabs. The method includes placing the battery module on the workbench; placing multiple insulating members on the insulating mechanism; adjusting the position of the battery module to align the battery module with the insulating mechanism; and inserting multiple insulating members into the multiple tabs along the third direction via the insulating mechanism, so that an insulating member is provided between every two adjacent tabs. The device inserts multiple insulating members between the multiple tabs of the battery module via the insulating mechanism, so that every two adjacent tabs are separated by the insulating members, thereby preventing tab-to-tab contact and causing a short circuit.

[0021] CN113054260A discloses a shaping and pressing mechanism for a lithium battery square battery module, comprising a first pressing assembly, a second pressing assembly, a locking assembly, and a distance measuring assembly; the first pressing assembly is located above the shaping and pressing station, and the bottom of the first pressing assembly has a plurality of pressing rollers that can be raised and lowered, the second pressing assembly is located on both sides of the shaping and pressing station, and the ends of the second pressing assembly are pressing plates that can move horizontally; the module stacking tray for carrying the battery module has extrusion plates at both ends and locking shafts on the sides; the locking assembly includes a limiting sleeve for clamping with the locking head and a locking positioning mechanism. The present invention also discloses a shaping method for achieving compression of the top, both sides, and both ends of the battery module. The beneficial effects of the present invention: ensuring the flatness of the top and both sides, as well as the length direction, can effectively ensure the control of the key dimensions of the module during the compression process of the module.

[0022] CN110394649A discloses an automatic stacking device for battery cells, which includes a base, a first connecting plate and a second connecting plate installed on the upper part of the base; a station turntable mechanism, the station turntable mechanism is connected to the first connecting plate, and the upper part of the station turntable mechanism is connected to the third connecting plate. The automatic stacking device for battery cells provided in this application solves the problems of slow beat, high cost and low precision of traditional robot stacking of battery cells. The lifting mechanism can directly lift the battery cells from the pallet onto the stacking tool in sequence, and there are clamping mechanisms on the left, right and top to clamp the battery cells to ensure high-precision stacking of the battery cells. At the same time, the stacking tool replaces the robot stacking, greatly reducing costs. Using a two-station turntable form, when the robot grabs a stacked module, the other stacking tool rotates to the lifting mechanism to continue stacking, greatly improving the beat.

[0023] The above patents have low relevance to this application. Summary of the Invention

[0024] The technical problem to be solved by the present invention is to overcome the production problems existing in the prior art, such as low production efficiency, incomplete process quality control, and no record storage of process data, and provide a module stacking workstation and a stacking quality control method.

[0025] The present invention provides a design scheme for a square module stacking workstation, which adopts automated assembly means to achieve automatic module stacking and quality control during the stacking process.

[0026] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0027] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions:

[0028] A module stacking workstation, comprising: a robot B5, a shaping workbench 9, a fastening and riveting workbench 15, and a safety test bench 17;

[0029] The robot B5 is used to complete the test of the polarity, open circuit voltage, AC internal resistance and self-discharge rate of the battery cell when grabbing the battery cell. The whole process is parallel to the grabbing and placing. That is, 100% performance testing is completed during the assembly process to ensure that the quality of the incoming materials can be controlled before assembly;

[0030] The shaping workbench 9 is used to shape the sides and top surfaces of the stacked battery modules, ensuring flatness through tooling, and monitoring shaping pressure and displacement in real time during shaping to control shaping quality;

[0031] The fastening and riveting workbench 15 is used to automatically perform the tightening process, with dual control of torque and angle;

[0032] The safety test bench 17 is used to automatically perform safety tests on the stacked assemblies.

[0033] Furthermore, the dual control means that when the product is unqualified, an alarm will be automatically given and the unqualified points will be indicated on the display screen; the riveting process will be automatically executed, the equipment will monitor the rivet position and core pulling results, an alarm will be given when the product is unqualified, and the unqualified points will be indicated on the display screen.

[0034] Furthermore, the safety test bench 17 mainly measures the insulation resistance and leakage current between the battery cell poles, the insulation resistance and leakage current of the battery cell to the module shell, and automatically determines whether it is qualified. Unqualified products will be alarmed and automatically offline after leaving the station.

[0035] A module stacking workstation further comprising a robot A3 and a robot C12;

[0036] The robot A3 is used to cooperate with a special fixture to grab the end plate and the air duct;

[0037] The robot C is equipped with a special fixture for grasping the side panels, wiring harness isolation panels and stacking assemblies.

[0038] A module stacking workstation also includes a stacking turntable 7, and battery cells, end plates, and air duct positioning fixtures are designed on the left and right sides of the stacking turntable 7. Robot A3 grabs the end plates and air ducts, and robot B5 grabs the battery cells, and they are placed alternately in the fixtures on the right side of the stacking turntable 7 according to the product design direction. After the stacking is full, the turntable turns the workpiece to the left, and the robot C12 grabs the grouped workpieces and places them on the shaping workbench 9 to achieve stacking of end plates, battery cells, and air ducts.

[0039] A module stacking workstation also includes a restraint pallet circulation temporary storage table 11, and the restraint pallet circulation temporary storage table 11 is used for caching the empty pallets during the process of being transferred from the fastening and riveting workbench 15 to the shaping workbench 9.

[0040] A module stacking quality control method comprises the following steps:

[0041] Step 1: Battery cell sorting: Robot A moves to battery cell loading position 1, uses a barcode scanner to scan the QR code of the battery cell to be grabbed, and reads the battery cell assembly number; after reading, the robot A gripper grabs the battery cell and transfers it from battery cell loading position 1 to stacking turntable 7; during the transfer process, the PLC controls the digital multimeter to detect the open circuit voltage of the battery cell to determine whether it is qualified, and compares it with the offline test results of the same battery cell delivered by the supplier, automatically calculates the self-discharge rate, and determines whether it is qualified; after the open circuit voltage and self-discharge rate are determined, the PLC controls the AC internal resistance tester to detect the AC internal resistance of the battery cell to determine whether it is qualified; the above test results are all bound to the battery cell assembly number, uploaded to the information system, and transmitted to the post-process and workshop central control system.

[0042] Step 2: Module stacking: Robot B grabs the battery cell and places it on the stacking table. It flips and adjusts the positive and negative poles of the battery cell according to the polarity orientation stored in the PLC. The stacking tooling ensures the position accuracy of the battery cell after placement.

[0043] Step 3: Module Shaping: Robot C grabs the stacked battery cells, air ducts, and end plates and places them on the shaping table. The servo mechanism presses the top and sides of the battery cells and applies pressure to the end plates, compressing them to the specified length.

[0044] Step 4: Tightening and riveting: The linear servo mechanism controls the tightening gun and riveting gun to align with the mounting hole. The high-precision tightening gun monitors the tightening torque and angle to ensure that the bolt assembly meets the requirements. If unqualified, an alarm will be prompted and the unqualified information will be uploaded to the information system.

[0045] Step 5: Safety test: The actuator drives the detection probe to contact the battery pole and the module side plate. The PLC controls the safety tester to perform insulation resistance and leakage current testing between the battery poles and between the battery poles and the shell to ensure that the insulation and withstand voltage are qualified.

[0046] Furthermore, a detection probe is designed on the battery cell fixture, and the probe head contacts the battery cell pole to achieve physical connection.

[0047] The above test results mentioned in step 1 refer to the open circuit voltage of the battery cell, the AC internal resistance measurement value and the calculated battery cell self-discharge rate.

[0048] During the compression process in step three, the extrusion force is monitored by a pressure sensor, the compression length is controlled by a linear servo, and the flatness of the side and end faces is ensured by tooling.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] Compared with the traditional manual stacking production line, the present invention realizes a fully automated assembly production line with high production efficiency and good consistency, which can meet 100% detection and quality control of key processing data; compared with the traditional automatic production line of battery companies, the stacking workstation described in the present invention realizes an island layout of equipment, and the process is self-enclosed. If necessary, production capacity can be quickly increased by duplicating the workstation. The transformation has little impact on the original production line layout and does not affect the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention will be further described below in conjunction with the accompanying drawings:

[0052] Figure 1 This is a schematic diagram of a conventional square module structure;

[0053] Figure 2 Layout diagram for traditional module production line;

[0054] Figure 3 This is a structural schematic diagram of a module stacking workstation according to the present invention;

[0055] Figure 4 This is a schematic diagram of a module stacking workstation process;

[0056] Figure 5 This is the architecture diagram of the workstation information collection system;

[0057] In the figure: 1. Battery cell loading position; 2. Air duct trolley positioning structure; 3. Robot A; 4. End plate loading workbench; 5. Robot B; 6. Battery cell NG station; 7. Stacking turntable; 8. Stacking NG station; 9. Shaping workbench; 10. Side plate loading workbench; 11. Restraint pallet circulation temporary storage station; 12. Robot C; 13. Wire harness isolation plate loading workbench; 14. Automatic screw feeding device; 15. Fastening rivet workbench; 16. Automatic rivet feeding device; 17. Safety test bench; 18. Work fence; 19. Conveyor roller. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of the implementation of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below in conjunction with the drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present invention, and should not be understood as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The embodiments of the present invention are described in detail below in conjunction with the drawings.

[0059] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0060] The present invention will be described in detail below with reference to the accompanying drawings:

[0061] This invention proposes an island-style module stacking workstation, enabling fully automated assembly and testing capabilities for cell sorting, module stacking, module shaping, side panel fastening, and safety testing. The compact workstation layout allows for high processing equipment utilization and enhanced production efficiency, enabling effective process quality control and 100% traceability of quality data. This significantly reduces equipment investment while maintaining consistent production capacity.

[0062] Automatic workstation layout such as Figure 3 As shown:

[0063] The workstation includes the following devices:

[0064] 1) Battery cell loading roller conveyor. Incoming battery cells are stored in their original packaging and transported by AGV to the loading roller conveyor, where they are transported into the workstation for precise positioning.

[0065] 2) Duct positioning mechanism, three sets. Two sets are used for duct loading, and one set is used for empty pallets unloading. The duct is stored in its original packaging and placed on the loading trolley. Logistics personnel push the trolley into the loading station, where a mechanical device clamps the trolley into position.

[0066] 3) Robot A. Six-axis robot A works with a dedicated fixture to grasp the end plate and air duct. The robot is equipped with a CCD vision system to guide the fixture for accurate grasping.

[0067] 4) End plate loading workbench. Logistics personnel manually place parts on the workbench, which is designed with precise limit blocks to ensure that the part position meets the requirements of automatic assembly.

[0068] 5) Automatic Robot B. This six-axis robot is equipped with a battery cell gripper that can simultaneously grasp multiple cells from a tray, scanning and identifying the cells before grasping them. The robot is equipped with a CCD vision system to guide the gripper for accurate grasping.

[0069] 6) Battery Cell NG Station. Batteries that fail testing are placed here and can be removed from outside the fence.

[0070] 7) Stacking turntable. Enables stacking of end plates, battery cells, and air ducts.

[0071] 8) Stacking NG station. The stacked NG assemblies are unloaded from this station.

[0072] 9) Shaping table. The stacked assembly is placed on this table, its sides are shaped, and it is compressed to the specified length. The compressed assembly is fixed using a restraint tray.

[0073] 10) Side panel loading table. Logistics personnel manually place the side panels on the workbench, which is designed with precise stoppers to ensure that the part position meets the requirements of automatic assembly.

[0074] 11) Restrict the pallet circulation temporary storage table.

[0075] 12) Robot C. This six-axis robot is equipped with specialized grippers to handle side panels, wiring harness dividers, and stacked assemblies. The robot is equipped with a CCD vision system to guide the grippers for accurate handling.

[0076] 13) Wire harness isolation board loading workbench. Logistics personnel manually stack the wire harness isolation boards and place them on the workbench. The workbench is designed with precise limit blocks to ensure that the parts are positioned to meet the requirements of automated assembly.

[0077] 14) Automatic screw feeding device.

[0078] 15) Tighten the riveting workbench to tighten and rivet the module side panels and end panels.

[0079] 16) Automatic rivet feeding device.

[0080] 17) Safety test bench. The actuator drives the detection probe plate to fully contact the top cover and side panels of the battery cell to test the insulation resistance and leakage current.

[0081] 18) Work fence.

[0082] 19) Conveyor roller conveyor. Conveys the stacked assembly out of the workstation.

[0083] NG stands for defective product.

[0084] Among them: Robot B5: completes the tests of battery cell polarity, open circuit voltage, AC internal resistance and self-discharge rate when grabbing the battery cell. The whole process is parallel to the grabbing and placement, that is, 100% performance testing is completed during the assembly process to ensure that the quality of incoming materials can be controlled before assembly.

[0085] Shaping workbench 9: Shaping the sides and top surfaces of the stacked battery modules, ensuring flatness through tooling, and monitoring shaping pressure and displacement in real time during shaping to control shaping quality.

[0086] Fastening rivet workbench 15: Automatically executes the tightening process, with dual control of torque and angle, automatically alarms when unqualified, and the display screen indicates the unqualified point; automatically executes the riveting process, the equipment monitors the rivet position and core pulling results, automatically alarms when unqualified, and the display screen indicates the unqualified point.

[0087] Safety Test Station 17: Automatically performs safety testing on stacked assemblies. It primarily measures the insulation resistance and leakage current between cell poles, and the insulation resistance and leakage current between the cell and the module housing. It automatically determines compliance, issues an alarm, and automatically removes unqualified products from the line upon exiting the station.

[0088] See Figure 4 , the production process is as follows:

[0089] (1) Automatic robot A grabs the end plate and places it on the stacking turntable

[0090] (2) Automatic robot B grabs the battery cell and places it on the stacking turntable

[0091] (3) Automatic robot A grabs the air duct stack and places it on the stacking turntable

[0092] (4) Complete steps (2) and (3) until the module stacking is complete

[0093] (5) Automatic robot C grabs the stacked assembly and places it on the shaping workbench

[0094] (6) Complete the shaping and compaction of the stacked parts and use the restraint tray to fix them

[0095] (7) Automatic robot C grabs the side panel and places it on the tightening riveting workbench

[0096] (8) Automatic robot C grabs the restraint tray with stacking assembly and places it on the tightening riveting workbench

[0097] (9) Automatic installation of side panels

[0098] (10) Automatic robot C grabs the wiring harness isolation plate and places it on the stacking assembly

[0099] (11) Automatically supply nails for fastening and riveting to fix the side panels and end panels.

[0100] (12) Automatic robot C grabs the fixed stack assembly and places it on the roller conveyor for module safety testing

[0101] illustrate: Figure 4 The direction of the arrow in the middle is the direction of material flow during the assembly process.

[0102] The workstation described in this invention enables quality control of the assembly process and 100% traceability of key quality data. Compared to traditional module assembly lines, cell sorting additionally utilizes AC internal resistance and self-discharge rate testing, while also performing a secondary verification of cell barcodes to confirm the accuracy of grouped cells. In addition to cell sorting, controlled and recorded processing data include shaping pressure, shaping displacement, tightening torque, insulation resistance, and leakage current. Detailed quality control details are shown in the table below:

[0103]

[0104] A module stacking quality control method comprises the following steps:

[0105] Step 1: Battery cell sorting: The robot moves to the battery cell loading position 1, uses the barcode scanner to scan the QR code of the battery cell to be grabbed, and reads the battery cell assembly number. After reading, the robot fixture grabs the battery cell and transfers it from the battery cell loading position 1 to the stacking turntable 7. The battery cell fixture is designed with a detection probe, and the probe head contacts the battery cell pole to achieve physical connection. During the transfer process, the PLC controls the digital multimeter to detect the open circuit voltage of the battery cell to determine whether it is qualified, and compares it with the offline test results of the same battery cell transmitted by the supplier, automatically calculates the self-discharge rate, and determines whether it is qualified. After the open circuit voltage and self-discharge rate are determined, the PLC controls the AC internal resistance tester to detect the AC internal resistance of the battery cell to determine whether it is qualified. The above test results are all bound to the battery cell assembly number, uploaded to the information system, and transmitted to the post-process and workshop central control system.

[0106] Step 2: Module Stacking: The robot grabs the battery cells and places them on the stacking table. It then flips and adjusts the positive and negative poles of the cells according to the polarity stored in the PLC. The stacking tooling ensures the correct positioning of the cells after placement.

[0107] Step 3: Module Shaping: The robot grabs the stacked components, including the battery cells, air ducts, and end plates, and places them on a shaping table. A servo mechanism compresses the top and sides of the battery cells, applying pressure to the end plates until they are compressed to the specified length. During the compression process, a pressure sensor monitors the extrusion force, a linear servo controls the compression length, and tooling ensures the flatness of the sides and ends.

[0108] Step 4: Tightening and riveting: The linear servo mechanism controls the tightening gun and rivet gun to align with the mounting hole. The high-precision tightening gun monitors the tightening torque and angle to ensure that the bolt assembly meets the requirements. Unqualified alarms will be prompted and unqualified information will be uploaded to the information system.

[0109] Step 5: Safety test: The actuator drives the detection probe to contact the battery pole and module side panel. The PLC controls the safety tester to perform 100% insulation resistance and leakage current testing between the battery poles and between the battery poles and the shell to ensure that the insulation and withstand voltage are qualified.

[0110] The foregoing description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by any person skilled in the art within the technical scope disclosed herein and within the spirit and principles of the present invention shall be covered by the scope of protection of the present invention. Furthermore, any matters not described in detail in this specification constitute prior art known to those skilled in the art.

Claims

1. A module stacking workstation, characterized in that: include: Robot B (5), shaping workbench (9), fastening and riveting workbench (15) and safety test bench (17); The robot B (5) is used to complete the test of the polarity, open circuit voltage, AC internal resistance and self-discharge rate of the battery cell when grabbing the battery cell. The whole process is parallel to the grabbing and placing. That is, 100% performance testing is completed during the assembly process to ensure that the quality of the incoming materials can be controlled before assembly; The shaping workbench (9) is used to shape the side and top surfaces of the stacked battery modules, ensuring flatness through tooling, and monitoring shaping pressure and displacement in real time during shaping to control shaping quality; The fastening and riveting workbench (15) is used to automatically perform a tightening process and an automatically performed riveting process, and the torque and angle are dually controlled in the automatically performed tightening process; The dual control means: the torque and angle dual parameters of the bolt tightening process are monitored, and if any result is unqualified, the equipment will automatically alarm and prompt, and the display screen will indicate the point where the unqualified bolt is tightened; in the automatic execution of the riveting process, the equipment monitors the rivet position and core pulling results. If unqualified, the equipment will prompt that the rivet is unqualified and display the location of the unqualified point; The safety test bench (17) is used to automatically perform safety tests on the stacked assembly, and to detect the insulation resistance and leakage current between the battery cell poles and between the battery cell poles and the shell.

2. A module stacking workstation according to claim 1, characterized in that: Also included are Robot A (3) and Robot C (12); The robot A (3) is used to cooperate with a special fixture to grab the end plate and the air duct; The robot C (12) is equipped with a special fixture for grasping the side panels, wiring harness isolation panels and stacking assemblies.

3. A module stacking workstation according to claim 2, characterized in that: The stacking turntable (7) is also included. The left and right sides of the stacking turntable (7) are designed with battery cells, end plates, and air duct positioning fixtures. Robot A (3) grabs the end plates and air ducts, and robot B (5) grabs the battery cells. They are alternately placed in the fixtures on the right side of the stacking turntable (7) according to the product design direction. After the stacking is full, the turntable turns the workpiece to the left, and robot C (12) grabs the grouped workpieces and places them on the shaping workbench (9).

4. A module stacking workstation according to claim 3, characterized in that: It also includes a restraint pallet transfer temporary storage table (11), which is used for caching empty pallets during the process of being transferred from the fastening and riveting workbench (15) to the shaping workbench (9).

5. The quality control method of a module stacking workstation according to claim 1, characterized in that: The following steps are involved: Step 1: Cell sorting: Robot A moves to the cell loading position (1), uses a barcode scanner to scan the QR code of the cell to be picked up, and reads the cell assembly number; after reading, the robot A gripper grabs the cell and transfers it from the cell loading position (1) to the stacking turntable (7); during the transfer process, the PLC controls the digital multimeter to detect the cell open circuit voltage to determine whether it is qualified, and compares it with the off-line test results of the same cell delivered by the supplier, automatically calculates the self-discharge rate, and determines whether it is qualified; after the open circuit voltage and self-discharge rate are determined, the PLC controls the AC internal resistance tester to detect the cell AC internal resistance to determine whether it is qualified; the above test results are all bound to the cell assembly number, uploaded to the information system, and transmitted to the post-process and workshop central control system; Step 2: Module stacking: Robot B grabs the battery cell and places it on the stacking table. It then flips and adjusts the positive and negative poles of the battery cell according to the polarity orientation stored in the PLC. The stacking tooling ensures the position accuracy of the battery cells after placement; Step 3: Module Shaping: Robot C grabs the stacked battery cells, air ducts, and end plates and places them on the shaping table. The servo mechanism presses the top and sides of the battery cells and applies pressure to the end plates, compressing them to the specified length. Step 4: Tightening and riveting: The linear servo mechanism controls the tightening gun and riveting gun to align with the mounting hole. The high-precision tightening gun monitors the tightening torque and angle to ensure that the bolt assembly meets the requirements. If unqualified, an alarm will be prompted and the unqualified information will be uploaded to the information system. Step 5: Safety test: The actuator drives the detection probe to contact the battery pole and the module side plate. The PLC controls the safety tester to perform insulation resistance and leakage current testing between the battery poles and between the battery poles and the shell to ensure that the insulation and withstand voltage are qualified.

6. The quality control method according to claim 5, characterized in that: The battery cell fixture is designed with a detection probe, and the probe head contacts the battery cell pole to achieve physical connection.

7. The quality control method according to claim 5, characterized in that: The above test results mentioned in step 1 refer to the open circuit voltage of the battery cell, the AC internal resistance measurement value and the calculated battery cell self-discharge rate.

8. The quality control method according to claim 5, characterized in that: During the compression process in step three, the extrusion force is monitored by a pressure sensor, the compression length is controlled by a linear servo, and the flatness of the side and end faces is ensured by tooling.

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