A semi-automatic assembly line for BDU modules

Abstract

This invention discloses a semi-automatic assembly production line for BDU modules, including a spiral-shaped double-speed chain conveyor, a loading and unloading mechanism, an installation mechanism, a flipping mechanism, an airtightness testing mechanism, and a cantilever crane. The loading and unloading mechanism is located on the spiral-shaped double-speed chain conveyor. The installation mechanism includes a terminal connector installation mechanism and a BDU installation mechanism arranged sequentially along the spiral-shaped double-speed chain conveyor. The flipping mechanism is located downstream of the installation mechanism. The airtightness testing mechanism is located on one side of the spiral-shaped double-speed chain conveyor and downstream of the BDU installation mechanism. The cantilever crane is located on one side of the spiral-shaped double-speed chain conveyor and is used for loading BDU housings, hoisting BDU modules, and transporting finished product assemblies. This semi-automatic assembly production line for BDU modules optimizes the workflow, improves assembly efficiency, reduces manual labor intensity, enables traceable testing data, ensures product quality, and guarantees continuous and stable operation of the production line.

Description

Technical Field

[0001] This invention relates to the field of battery processing technology, and more specifically to a semi-automatic assembly line for BDU modules. Background Technology

[0002] The BDU (Battery Disconnect Unit) module is a core component in the battery pack of new energy vehicles, responsible for high-voltage circuit switching, protection, and signal acquisition. Its assembly accuracy, sealing, and electrical performance directly affect the safety and reliability of the battery pack. Currently, BDU module assembly is mainly carried out manually in a decentralized manner or with simple single-station equipment. This results in poor process connection, low positioning accuracy, and the need for repeated manual flipping of workpieces for wiring harness installation and performance testing, which is cumbersome and poses high safety risks. Traditional airtightness testing is mostly a single-station structure, with a testing cycle time that does not match the overall production line. Furthermore, the testing data and results are difficult to automatically upload to the control system, resulting in weak process traceability. In addition, the linear production line layout occupies a large area and has low space utilization, which cannot meet the needs of efficient, compact, and traceable large-scale production, thus restricting the improvement of assembly efficiency and product consistency.

[0003] Therefore, the present invention provides a semi-automatic assembly line for BDU modules to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and propose a semi-automatic assembly production line for BDU modules, thereby solving the technical problems of dispersed assembly processes and low installation efficiency in the existing BDU module technology.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution: This invention provides a semi-automatic assembly line for BDU modules, comprising: Spiral-shaped speed-multiplying chain body; The loading and unloading mechanism is located on the loop-shaped double-speed chain line and is used for loading BDU shells and unloading finished products. The mounting mechanism includes a terminal connector mounting mechanism and a BDU mounting mechanism arranged sequentially along the loop-shaped double-speed chain body, which are respectively used for assembling the terminal connector and assembling and fixing the BDU module and the BDU housing. A flipping mechanism is located downstream of the terminal connector mounting mechanism and the BDU mounting mechanism, and is used to clamp the BDU workpiece and flip it. An airtightness testing mechanism, located on one side of the loop-type speed-multiplying chain and downstream of the BDU mounting mechanism, is used to test the sealing performance of the BDU module; and A cantilever crane is installed on one side of the loop-shaped double-speed chain line and is used for loading BDU housings, hoisting BDU modules, and transporting finished assemblies.

[0006] In some embodiments, the loop-shaped double-speed chain conveyor includes a reversing table, a double-speed chain conveyor, a lifting mechanism, a product sensing and photoelectric assembly, a lifting roller mechanism, and a guide ladder. The reversing table is located at the corner of the loop-shaped double-speed chain conveyor, and adjacent reversing tables are connected by the double-speed chain conveyor. The lifting mechanism is correspondingly located below the loading / unloading mechanism and the installation mechanism. The lifting roller mechanism is located below the airtightness detection mechanism. The product sensing and photoelectric assembly is installed at both ends of the lifting mechanism, and the guide ladder spans above one of the double-speed chain conveyors.

[0007] In some embodiments, the loading and unloading mechanism is configured as an integrated mechanism for loading BDU housings and unloading finished products, arranged at the end of the loop-type speed-multiplying chain line, for transferring BDU housing loading, finished product inspection and assembly unloading.

[0008] In some embodiments, the flipping mechanism includes a terminal high-voltage harness mounting flipping mechanism and an assembly testing flipping mechanism, wherein the terminal high-voltage harness mounting flipping mechanism is disposed downstream of the terminal connector mounting mechanism, and the assembly testing flipping mechanism is disposed downstream of the BDU mounting mechanism.

[0009] In some embodiments, the terminal high-voltage harness installation flipping mechanism and the assembly test flipping mechanism have the same structure, both including a lifting gantry, a product clamping lifting assembly, a flipping assembly, an operation panel, and a safety light curtain. The two ends of the product clamping lifting assembly are fixedly connected to the upper end of the lifting gantry, and the two ends of the flipping assembly are fixedly connected to the output end of the product clamping lifting assembly. The operation panel is located on the outside of the lifting gantry and is electrically connected to the product clamping lifting assembly and the flipping assembly respectively. The safety light curtain is arranged along the periphery of the flipping mechanism.

[0010] In some embodiments, the assembly test flipping mechanism is further provided with an EOL test device, located downstream of the airtightness testing mechanism, and both the airtightness testing mechanism and the EOL test device are equipped with a data upload interface.

[0011] In some embodiments, the airtightness detection mechanism is configured as a dual-station structure, including a first airtightness detection mechanism and a second airtightness detection mechanism. The first airtightness detection mechanism and the second airtightness detection mechanism have the same structure and are arranged side by side on the inner side of the loop-shaped double-speed chain body.

[0012] In some embodiments, both the first and second airtightness testing mechanisms include an upper frame, a lower frame, an airtightness testing instrument, a pressing component, a sealing plate, a pull plate assembly, and an in-station roller assembly. The upper frame and the lower frame are vertically connected. The airtightness testing instrument is installed inside the upper frame. The pressing component is fixedly installed inside the upper frame with its output end facing downward. The sealing plate is connected to the lower end of the pressing component. The in-station roller assembly is installed at the upper end of the lower frame and located below the sealing plate. The pull plate assembly is installed at the middle position of the in-station roller assembly. The pull plate assembly is used to pull the pallet of the product to be tested into the airtightness testing mechanism and automatically push the pallet out to the loop-type double-speed chain conveyor after the test is completed.

[0013] In some embodiments, the cantilever crane includes an upper line cantilever crane and a BDU cantilever crane. The upper line cantilever crane is arranged beside the loading and unloading mechanism for loading BDU housings and unloading finished products. The BDU cantilever crane is arranged beside the BDU mounting mechanism for hoisting BDU modules.

[0014] In some embodiments, the production line is further provided with a rework mechanism, which is arranged on the outside of the loop-shaped double-speed chain body.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The semi-automatic assembly production line of the BDU module of this invention is based on a loop-shaped closed-loop conveyor, integrating the entire process functions such as parts assembly, sealing inspection, and finished product transfer. By setting up a loop-shaped double-speed chain conveyor and combining it with a multi-station continuous arrangement, it effectively improves the flow efficiency, reduces process waiting time, and solves the problem of low operating efficiency in traditional production lines. Relying on the lifting mechanism and product sensing and photoelectric components, it achieves precise workpiece positioning and fixation, improving the defect of inaccurate assembly positioning. The flipping mechanism is equipped with a safety light curtain, and each working area is protected by partitions, effectively avoiding the risk of human-machine interference and making up for the shortcomings of insufficient safety protection. At the same time, the airtightness testing equipment and EOL testing device are equipped with data upload interfaces, which can collect and upload test data in real time, realize the traceability of the entire production and testing process, and properly solve the problem of difficult product quality traceability.

[0016] Compared to traditional production lines, this production line significantly improves assembly efficiency and reduces errors caused by manual intervention through a loop conveyor and multi-station parallel operation. Standardized flipping, installation, and inspection mechanisms achieve precise and standardized BDU module assembly, reducing labor intensity. Simultaneously, the integrated loading, unloading, and inspection structure simplifies the production process, reduces equipment maintenance costs, and improves production continuity and stability. This production line meets the efficiency requirements of large-scale production while ensuring product quality, adapting to the high standards required for core component assembly in the new energy field. Compared to existing technologies, it offers significant improvements in space utilization, operational safety, and quality control, better meeting the market's demand for mass production of BDU modules. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the semi-automatic assembly line of the BDU module of the present invention from one perspective. Figure 2 This is a schematic diagram of the semi-automatic assembly line of the BDU module of the present invention from another perspective. Figure 3 This is a schematic diagram of the structure of the spiral-shaped speed-doubling chain of the present invention; Figure 4 This is a schematic diagram of the flipping mechanism of the present invention; Figure 5 This is a schematic diagram of the airtightness detection mechanism of the present invention; Explanation of reference numerals in the attached drawings: 100, Double-speed chain conveyor body; 110, Reversing table; 120, Double-speed chain conveyor line; 130, Lifting mechanism; 140, Product induction and photoelectric assembly; 150, Lifting roller mechanism; 160, Wire guide ladder; 200, Loading and unloading mechanism; 310, Terminal connector mounting mechanism; 320, BDU mounting mechanism; 410, Terminal high-voltage wire harness mounting and flipping mechanism; 420, Assembly testing and flipping mechanism; 430, Lifting gantry; 440, Product clamping mechanism. Lifting assembly; 450, Tilting assembly; 460, Operation panel; 470, Safety light curtain; 510, First airtightness testing mechanism; 520, Second airtightness testing mechanism; 530, Upper frame; 540, Lower frame; 550, Airtightness testing instrument; 560, Downward pressure assembly; 570, Sealing plate; 580, Pulling plate assembly; 590, Station roller assembly; 610, Online cantilever crane; 620, BDU cantilever crane; 700, EOL testing equipment; 800, Repair mechanism. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] To address the technical problems of low assembly efficiency, low space utilization, and lack of traceability in existing BDU module assembly lines, this invention provides a semi-automatic assembly line for BDU modules. This line can achieve integrated semi-automatic operation of BDU housing feeding, terminal installation, wire harness assembly, BDU assembly, dual-station airtightness testing, EOL assembly testing, and assembly off-line, while improving production line positioning accuracy, operational safety, production cycle time, space utilization, and quality traceability.

[0020] It should be noted that the production line described in this invention is used for, but is not limited to, automated production lines for core components of battery packs such as the assembly of BDU modules for new energy vehicle battery packs, the assembly of BDU units for energy storage batteries, and the automated assembly of core components for power battery systems. For ease of explanation, this invention only uses the application of this production line to the semi-automatic assembly of BDU modules for new energy vehicle power battery packs as an example. The principle of this production line applied to other types of battery pack core component assembly production lines is essentially the same as that applied to this production line, and will not be elaborated here.

[0021] Please see Figures 1 to 5This is a schematic diagram of the semi-automatic assembly production line for the BDU module of the present invention. The semi-automatic assembly production line for the BDU module mainly includes a loop-type double-speed chain conveyor 100, a loading and unloading mechanism 200, an installation mechanism, a flipping mechanism, an airtightness testing mechanism, and a cantilever crane. The loading and unloading mechanism 200 is located at the end of the loop-type double-speed chain conveyor 100, realizing integrated operation of BDU shell loading and finished product unloading. The installation mechanism is arranged sequentially along the loop-type double-speed chain conveyor 100, including a terminal connector installation mechanism 310 and a BDU installation mechanism 320, which respectively complete the pre-installation of terminal connectors and BDU modules. Precise assembly and fixation with the BDU housing; the flipping mechanism is located downstream of the terminal connector mounting mechanism 310 and the BDU mounting mechanism 320, used to clamp and flip the BDU workpiece 180°, facilitating manual installation and testing of the front and back wire harnesses; the airtightness testing mechanism is arranged downstream of the BDU mounting mechanism 320, used to test the sealing performance of the assembled BDU module; the cantilever is suspended outside the loop-shaped double-speed chain line 100, cooperating with each station to complete the loading of the BDU housing, the hoisting of the BDU module and the hoisting of the finished assembly. The various mechanisms are connected in an orderly manner along the loop line to form a continuous and stable semi-automatic assembly system. Each unit relies on the 100-speed, loop-shaped conveyor belt to achieve closed-loop conveying and precise positioning. Through coordinated actions such as lifting, reversing, sensing, clamping, flipping, and sealing detection, it completes the entire process from BDU shell loading, dust removal and barcode scanning, terminal installation, wiring harness assembly, BDU fixing, airtightness testing, assembly testing to finished product unloading. The overall layout is compact and has a high space utilization rate. Dual-station airtightness testing and flipping assembly effectively improve operational efficiency and safety, and can significantly improve the consistency of BDU module assembly, yield rate, and overall line automation level, meeting the needs of efficient, stable, and large-scale production of core components for new energy vehicle battery packs.

[0022] In this embodiment, please participate Figure 3The loop-shaped double-speed chain conveyor 100 includes a reversing table 110, a double-speed chain conveyor line 120, a lifting mechanism 130, a product sensing and photoelectric assembly 140, a lifting roller mechanism 150, and a guide ladder 160. The reversing table 110 is arranged at the corner of the loop-shaped double-speed chain conveyor 100. Adjacent reversing tables 110 are connected end-to-end by the double-speed chain conveyor line 120 to form a closed-loop conveying channel. The lifting mechanism 130 is correspondingly arranged below the assembly stations such as the loading and unloading mechanism and the installation mechanism, and is used to accurately lift and position the pallet to ensure the accuracy of manual and equipment operations. The lifting roller mechanism 150 is located at the airtightness testing mechanism. Below, to facilitate the smooth connection and transfer of the pallet in conjunction with the pulling plate and sealing detection actions, the product sensing photoelectric component 140 is installed at both ends of the lifting mechanism 130. It is used to detect the pallet's position status in real time and automatically trigger the lifting and positioning actions. The cable ladder 160 is connected above the double-speed chain conveyor line 120 for the orderly passage of cables and the safety protection of the line. Through the coordinated operation of the above structures, the double-speed chain conveyor line 100 can realize continuous pallet transportation, precise stopping, free reversal and stable lifting, which greatly improves the line space utilization and turnover efficiency, and provides a reliable transportation and positioning foundation for the automation and rhythmic production of the whole line.

[0023] In this embodiment, please participate Figure 1 The loading and unloading mechanism 200 adopts an integrated structure for loading BDU shells and unloading finished products. It is fixedly arranged at the end of the loop-type double-speed chain line 100 and works in conjunction with the cantilever crane to sequentially complete operations such as loading and positioning BDU shells, manual pre-processing, finished product appearance inspection, and assembly unloading. This achieves closed-loop transfer of BDU shell input and finished product output at the same workstation. This integrated layout, with one machine serving two purposes, effectively shortens the line length, saves production space, simplifies material flow path, improves loading and unloading efficiency, and ensures the continuity and stability of the entire line's cyclical production.

[0024] In this embodiment, please refer to Figure 1 , Figure 2 The flipping mechanism includes a terminal high-voltage wire harness installation flipping mechanism 410 and an assembly testing flipping mechanism 420. The terminal high-voltage wire harness installation flipping mechanism 410 is arranged downstream of the terminal connector installation mechanism 310 and is used to complete the front and back assembly of the terminal high-voltage wire harness. The assembly testing flipping mechanism 420 is arranged downstream of the BDU installation mechanism 320 and is used to cooperate with EOL testing to realize the front and back detection and docking of the product. The two mechanisms are arranged sequentially along the loop-shaped double-speed chain 100 and are smoothly connected with the front and back workstations to ensure the continuous and orderly assembly and testing process.

[0025] In one embodiment, please refer to Figure 4The terminal high-voltage harness installation and flipping mechanism 410 and the assembly testing and flipping mechanism 420 adopt the same structure, both including a lifting gantry 430, a product clamping and lifting assembly 440, a flipping assembly 450, an operation panel 460, and a safety light curtain 470. The two ends of the product clamping and lifting assembly 440 are fixedly connected to the upper part of the lifting gantry 430 to achieve stable lifting and lowering drive. The two ends of the flipping assembly 450 are installed at the output end of the product clamping and lifting assembly 440, which can drive the product to perform a precise 180° flip. The operation panel 460 is located on the outside of the lifting gantry 430, which facilitates manual independent control of lifting and flipping actions. The safety light curtain 470 is arranged around the working area of ​​the flipping mechanism to form a safety protection barrier. This structure can achieve stable product clamping, collision-free flipping, and safe human-machine operation, greatly improving assembly convenience and operational safety. At the same time, the unified structure reduces equipment maintenance costs and improves the reliability and versatility of the entire line.

[0026] In this embodiment, please refer to Figure 1 An EOL testing device 700 is installed alongside the assembly test flipping mechanism 420. The EOL testing device 700 is located downstream of the airtightness testing mechanism and on one side of the loop-type double-speed chain line 100, and works in conjunction with the assembly test flipping mechanism 420. Both the airtightness testing mechanism and the EOL testing device 700 are equipped with dedicated data upload interfaces, which can upload the sealing test data and electrical performance test data of the BDU module to the control system in real time. This enables the full recording and traceability of test results and test parameters, facilitating real-time monitoring of product quality and identification of potential production hazards by staff. It also provides data support for subsequent quality analysis and process optimization, effectively improving the overall quality control level of the production line.

[0027] In this embodiment, please refer to Figure 2 The airtightness testing mechanism adopts a dual-station parallel structure, including a first airtightness testing mechanism 510 and a second airtightness testing mechanism 520. The two mechanisms are identical and symmetrically arranged side by side on the inner side of the loop-shaped double-speed chain line 100, located between the BDU installation mechanism 320 and the assembly test flipping mechanism 420. They can alternately perform airtightness testing, effectively matching the production cycle of the entire line, avoiding line waiting due to excessive time consumption of single-station testing, and significantly improving the overall operating efficiency and continuity of the production line.

[0028] In one embodiment, please refer to Figure 5Both the first airtightness testing mechanism 510 and the second airtightness testing mechanism 520 consist of an upper frame 530, a lower frame 540, an airtightness testing instrument 550, a pressing assembly 560, a sealing plate 570, a pull plate assembly 580, and an internal roller assembly 590. The upper frame 530 and the lower frame 540 are joined together to form a stable testing main frame. The airtightness testing instrument 550 is installed inside the upper frame 530 and can be connected to an external control panel to monitor and display testing parameters such as pressure and leakage in real time. The pressing assembly 560 is fixed inside the upper frame 530 with its output end facing downwards. The sealing plate... 570 is connected to the lower end of the pressing component 560 and driven by it to complete the product pressing and sealing. The station roller assembly 590 is installed on the upper end of the lower frame 540 and located below the sealing plate 570. It is used to stably support and transport the product pallet. The pull plate assembly 580 is installed in the middle of the station roller assembly 590. It can automatically pull the pallet to be tested into the testing station. After the test is completed, the pallet is smoothly pushed out to the loop-type double-speed chain 100. This realizes automatic pallet connection, precise positioning, reliable sealing and efficient testing, and ensures that the sealing test results of the BDU module installation are accurate, stable and traceable.

[0029] In this embodiment, please refer to Figure 1 , Figure 2 The cantilever crane includes an upper line cantilever crane 610 and a BDU cantilever crane 620, both of which are arranged on the outside of the loop-shaped double-speed chain conveyor body 100, precisely docking with and cooperating with the corresponding workstations. Among them, the upper line cantilever crane 610 is arranged on the side of the loading and unloading mechanism 200, mainly used for lifting and loading BDU shells and lifting and unloading finished assemblies, cooperating with the loading and unloading mechanism 200 to achieve efficient material transfer. The BDU cantilever crane 620 is arranged on the side of the BDU installation mechanism 320, used to precisely lift BDU modules to the corresponding assembly position of the BDU shell, assisting manual assembly and fixing, replacing manual handling, which not only reduces the labor intensity of operators, but also avoids product damage during handling, while improving the accuracy of lifting and assembly, and ensuring the smooth and efficient assembly process.

[0030] In this embodiment, please refer to Figure 1 , Figure 2The production line is also equipped with a rework mechanism 800, which is located on the outside of the loop-type double-speed chain conveyor 100, downstream of the airtightness testing mechanism and the EOL testing equipment 700. It maintains a reasonable distance from the loop-type double-speed chain conveyor 100 to facilitate the rapid transfer and rework of defective products. Its working principle is as follows: when the airtightness test or EOL test determines that a product is defective, the operator can transfer the defective BDU module from the line tray to the rework mechanism 800 for offline disassembly, fault diagnosis, debugging, repair, and re-inspection. After passing the re-inspection, it can be returned to the loop-type double-speed chain conveyor 100 to continue subsequent processes. Defective products are isolated. This mechanism effectively prevents defective products from flowing into the next process, improves the overall product yield of the line, and achieves efficient rework and resource reuse of defective products, ensuring the continuous and stable operation of the production line and reducing production losses.

[0031] To better understand this invention, the following is combined with... Figures 1 to 5 The technical solution of the present invention is described in detail as follows: The semi-automatic assembly production line of the BDU module of the present invention relies on the loop-shaped double-speed chain conveyor 100 to build a continuous and efficient assembly system. With the loop-shaped double-speed chain conveyor as the carrier, through the coordinated cooperation of various functional mechanisms, the entire process of semi-automatic operation from BDU shell loading, component assembly, sealing test to finished product unloading is realized. This ensures assembly accuracy, improves production efficiency, and achieves process traceability, meeting the needs of large-scale and standardized production of BDU modules. Specifically, the process begins with a closed-loop connection between the loading and unloading mechanism and the cantilever crane, ensuring the loading of the BDU housing and the unloading of the finished product. Next, the installation mechanism precisely assembles the terminals and BDU modules, while a flipping mechanism enables assembly on both sides of the product, adapting to different workstation requirements. Subsequently, airtightness testing and EOL testing ensure product quality, with all test data uploaded to the control system in real time for quality control and traceability. Throughout the production process, the closed-loop conveyor design of the loop conveyor system enables continuous material flow. Coordinated actions such as sensing, positioning, and clamping ensure orderly connection between each process, reducing errors from manual intervention and improving operational safety and production stability. This effectively solves the problems of low efficiency, poor precision, and chaotic processes in traditional assembly, meeting the high standards required for core component assembly in the new energy field.

[0032] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A semi-automatic assembly line for BDU modules, characterized in that, include: Spiral-shaped speed-multiplying chain body; The loading and unloading mechanism is located on the loop-shaped double-speed chain line and is used for loading BDU shells and unloading finished products. The mounting mechanism includes a terminal connector mounting mechanism and a BDU mounting mechanism arranged sequentially along the loop-shaped double-speed chain body, which are respectively used for assembling the terminal connector and assembling and fixing the BDU module and the BDU housing. A flipping mechanism is located downstream of the terminal connector mounting mechanism and the BDU mounting mechanism, and is used to clamp the BDU workpiece and flip it. An airtightness testing mechanism is located on one side of the loop-shaped double-speed chain body and downstream of the BDU mounting mechanism, and is used to test the sealing performance of the BDU module. as well as A cantilever crane, located on one side of the loop-shaped double-speed chain line, is used for loading BDU housings, hoisting BDU modules, and transporting finished assemblies.

2. The semi-automatic assembly line for the BDU module according to claim 1, characterized in that, The spiral double-speed chain conveyor includes a reversing table, a double-speed chain conveyor line, a lifting mechanism, a product sensing and photoelectric sensor assembly, a lifting roller mechanism, and a guide ladder. The reversing table is located at the corner of the spiral double-speed chain conveyor line, and adjacent reversing tables are connected by the double-speed chain conveyor line. The lifting mechanism is correspondingly located below the loading / unloading mechanism and the installation mechanism. The lifting roller mechanism is located below the airtightness detection mechanism. The product sensing and photoelectric sensor assembly is installed at both ends of the lifting mechanism. The guide ladder spans above one of the double-speed chain conveyor lines.

3. The semi-automatic assembly line for the BDU module according to claim 1, characterized in that, The loading and unloading mechanism is configured as an integrated mechanism for loading BDU housings and unloading finished products. It is located at the end of the loop-shaped speed-multiplying chain line and is used to transfer BDU housing loading, finished product inspection and assembly unloading.

4. The semi-automatic assembly line for the BDU module according to claim 1, characterized in that, The flipping mechanism includes a terminal high-voltage wiring harness installation flipping mechanism and an assembly testing flipping mechanism. The terminal high-voltage wiring harness installation flipping mechanism is located downstream of the terminal connector installation mechanism, and the assembly testing flipping mechanism is located downstream of the BDU installation mechanism.

5. The semi-automatic assembly line for the BDU module according to claim 4, characterized in that, The terminal high-voltage wiring harness installation and flipping mechanism has the same structure as the assembly test flipping mechanism, both including a lifting gantry, a product clamping and lifting assembly, a flipping assembly, an operation panel, and a safety light curtain. The two ends of the product clamping and lifting assembly are fixedly connected to the upper end of the lifting gantry, and the two ends of the flipping assembly are fixedly connected to the output end of the product clamping and lifting assembly. The operation panel is located on the outside of the lifting gantry and is electrically connected to both the product clamping and lifting assembly and the flipping assembly. The safety light curtain is arranged along the periphery of the flipping mechanism.

6. The semi-automatic assembly line for the BDU module according to claim 4, characterized in that, The assembly test flipping mechanism is also equipped with an EOL test device, located downstream of the airtightness testing mechanism, and both the airtightness testing mechanism and the EOL test device are equipped with data upload interfaces.

7. The semi-automatic assembly line for the BDU module according to claim 1, characterized in that, The airtightness testing mechanism is configured as a dual-station structure, including a first airtightness testing mechanism and a second airtightness testing mechanism. The first airtightness testing mechanism and the second airtightness testing mechanism have the same structure and are arranged side by side on the inner side of the loop-shaped double-speed chain body.

8. The semi-automatic assembly line for the BDU module according to claim 7, characterized in that, Both the first and second airtightness testing mechanisms include an upper frame, a lower frame, an airtightness testing instrument, a pressing component, a sealing plate, a pulling plate component, and an in-station roller assembly. The upper and lower frames are connected vertically. The airtightness testing instrument is installed inside the upper frame. The pressing component is fixedly installed inside the upper frame with its output end facing downward. The sealing plate is connected to the lower end of the pressing component. The in-station roller assembly is installed at the upper end of the lower frame and located below the sealing plate. The pulling plate assembly is installed in the middle position of the in-station roller assembly. The pulling plate assembly is used to pull the pallet of the product to be tested into the airtightness testing mechanism and automatically push the pallet out to the loop-type double-speed chain conveyor after the test is completed.

9. The semi-automatic assembly line for the BDU module according to claim 1, characterized in that, The cantilever crane includes an upper line cantilever crane and a BDU cantilever crane. The upper line cantilever crane is arranged next to the loading and unloading mechanism for loading BDU shells and unloading finished products. The BDU cantilever crane is arranged next to the BDU mounting mechanism for hoisting BDU modules.

10. The semi-automatic assembly line for the BDU module according to claim 1, characterized in that, The production line is also equipped with a rework mechanism, which is located on the outside of the spiral double-speed chain body.

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