Air tightness detection production line for welded upper shell of battery box

Abstract

The utility model discloses an air tightness detection production line for a welded upper shell of a battery box. The air tightness detection device comprises a plurality of air tightness detection devices arranged front and back, a conveying device located on the left front sides of the air tightness detection devices and used for conveying welded battery box upper shells, and a discharging station located on the right sides of the air tightness detection devices. The feeding device is located on the left side of the air tightness detection device and used for carrying the battery box upper shell on the conveying device to the air tightness detection device, and the feeding device is located between the air tightness detection device and the discharging station and used for carrying the battery box upper shell detected on the air tightness detection device. And the material receiving device is arranged on the blanking station. The air tightness detection device is compact in layout, small in occupied space and high in detection efficiency, and not only can ensure the accuracy of air tightness detection, but also can effectively improve the rhythm of the air tightness test.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery box production technical field, especially, relate to a battery box upper casing after welding air tightness detection production line. BACKGROUND

[0002] In order to guarantee the strength of battery box casing, the upper casing of battery box adopts thicker material to punch integrated molding at present, but thicker material can add the weight of battery box casing, makes the endurance mileage of new energy automobile sharply reduces, and the assembly hole of casing needs CNC machining, and CNC machining can have artificial intervention, and production efficiency is low, and product quality is poor.Therefore, the selection of raw material of the upper casing of battery box, process design, production stability and production continuity are very important.

[0003] In order to solve the above problems, a battery box upper casing 900 (as shown in Figure 1 It is welded by upper cover 700 and bottom plate 800, and upper cover 700 is welded at one end of bottom plate 800.This battery box upper casing after welding needs to be air tightness detected to confirm that there is no crack, damage and other problems in the weld, such as the battery box frame semi-automatic flexible production line disclosed in Chinese patent publication No.CN 215146380 U, the automatic production line and production process of aluminum alloy battery box disclosed in Chinese patent publication No.CN 113414641 B and the automatic production system of battery box bottom support disclosed in Chinese patent publication No.CN 209206927 U, all of which are provided with air tightness detection device to detect the air tightness of the welded battery box, but since the production line is linear, it is sequentially transferred from one station to the next station, therefore, the space occupied is very large, and only one battery box can be air tightness detected at a time, and the detection efficiency is low.

[0004] Therefore, it is necessary to provide a battery box upper casing after welding air tightness detection production line to solve the above technical problems. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a battery box upper casing after welding air tightness detection production line, which is compact in layout, small in space occupied and high in detection efficiency, not only can guarantee the accuracy of air tightness detection, but also can effectively improve the rhythm of air tightness test.

[0006] The utility model discloses a battery box upper casing after welding air tightness detection production line, it includes a plurality of air tightness detection devices of front -and -back arrangement, located the air tightness detection device left front side and is used for conveying the conveying device of battery box upper casing of welding completion, located the blanking station of air tightness detection device right side, located the air tightness detection device left side and is used for carrying battery box upper casing on the air tightness detection device on the feeding device and is located between the air tightness detection device with the blanking station and is used for carrying battery box upper casing on the air tightness detection device and carries the material receiving device on the blanking station of detection completion.

[0007] Further, the conveying device includes a conveying line and a positioning mechanism installed above the conveying line and used to position the battery box upper casing; the positioning mechanism includes a positioning seat, a plurality of first positioning pins arranged on the positioning seat and extending into the positioning hole of the battery box upper casing to realize positioning, and a plurality of first positioning supports arranged on the positioning seat and used to support the battery box upper casing.

[0008] Further, the air tightness detection device includes a rack, a pressing detection mechanism arranged at one end of the rack and used to press the battery box casing and perform air tightness detection, a positioning and supporting mechanism used to position and support the battery box upper casing, a moving platform used to install the positioning and supporting mechanism, and a first driving member arranged on the rack and used to drive the moving platform to move linearly so that the to-be-detected position of the battery box upper casing is located directly below the pressing detection mechanism.

[0009] Further, the positioning and supporting mechanism includes a plurality of second positioning pins extending into the positioning hole of the battery box upper casing to realize positioning, a plurality of supporting columns used to support the rear end of the battery box upper casing, a supporting table used to support the welding position of the battery box upper casing, and a lower profiling boss arranged on the supporting table and profiled with the inner cavity of the battery box upper casing.

[0010] Further, the supporting table is provided with a first sealing strip profiled with the lower surface of the lower casing of the battery box to realize sealing; the lower profiling boss includes a plurality of first air holes arranged on the upper surface, a plurality of second air holes arranged on the side and communicating with the first air holes, and a receiving groove arranged on the upper surface.

[0011] Further, the pressing detection mechanism includes a second driving member fixed on the rack, a first mounting bracket driven by the second driving member to move up and down, an upper profiling boss fixed on the lower surface of the first mounting bracket and used to realize sealing with the top end of the battery box upper casing, and a plurality of pressing assemblies fixed on the lower surface of the first mounting bracket and used to press on one side of the weld.

[0012] Further, the upper profiling boss comprises a second sealing strip extending into the accommodating groove to realize sealing among the upper profiling boss, the lower profiling boss and the upper shell of the battery box, and a third vent hole communicating with the first vent hole, after the upper profiling boss and the lower profiling boss are positioned and sealed in a top-down manner, the bottom of the lower profiling boss, the two welded upper cover and bottom plate and the weld form a sealed cavity, and a gas flow channel is formed between the upper profiling boss and the lower profiling boss, from the third vent hole into the first vent hole, from the first vent hole into the second vent hole, and from the second vent hole into the sealed cavity.

[0013] Further, the blanking station is provided with a finished product station for placing good products and a substandard product station for placing substandard products.

[0014] Further, the feeding device comprises a first movable ground rail arranged front and back, and a first carrying manipulator slidingly arranged on the first movable ground rail; and the collecting device comprises a second movable ground rail arranged front and back, and a second carrying manipulator slidingly arranged on the second movable ground rail.

[0015] Further, the first carrying manipulator and the second carrying manipulator are the same in structure and each comprise a gripper frame, a plurality of positioning components arranged on the gripper frame and used for positioning the upper shell of the battery box, a plurality of adsorption components arranged on the gripper frame and used for adsorbing the upper surface of the upper shell of the battery box, and a plurality of clamping components arranged on the gripper frame and used for clamping the peripheral edge of the upper shell of the battery box.

[0016] Compared with the prior art, the battery box upper shell welding post-airtightness detection production line has the following beneficial effects:

[0017] (1) A plurality of air tightness detection devices are arranged front and back, a conveying device and a feeding device are arranged on the left side of the plurality of air tightness detection devices, and a blanking device and a collecting device are arranged on the right side, so that the layout is compact, the occupied space is small, and the plurality of air tightness detection devices arranged for detection have high detection production efficiency;

[0018] (2) The carrying manipulators are slidingly arranged on the movable ground rails, and can feed or discharge the plurality of air tightness detection devices, so that the plurality of air tightness detection devices are detected, the working efficiency is improved, and the carrying manipulators can be saved;

[0019] (3) A plurality of compression assemblies are annularly distributed on the outer periphery of the upper profiling boss and form an annular structure in imitation of the weld, and each two connecting rods are fixed with a compression strip at the lower end, a plurality of compression strips form an annular structure in imitation of the weld and are compressed at the lap joint of the upper cover and the bottom plate, and a spring is sleeved on the outer periphery of the connecting rod, and the spring can ensure that the pressure is not too large to cause compression or overpressure, preventing deformation around the weld.

[0020] (4) After the upper profiling boss and the lower profiling boss are positioned and sealed, the bottom of the lower profiling boss, the upper cover, the bottom plate and the weld form a sealed cavity, the sealed cavity is filled with air, and the welding abnormality of the weld is judged by judging the air tightness of the sealed cavity, and the detection process is simple and the precision is high.

[0021] Therefore, the battery box upper shell welding post air tightness detection production line provided by the scheme has compact layout, small occupied space and high detection efficiency, which not only ensures the precision of air tightness detection, but also effectively improves the air tightness test pace. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a three-dimensional structure schematic diagram of the battery box upper shell of the embodiment of the utility model;

[0023] Figure 2 It is a top view schematic diagram of the battery box upper shell welding post air tightness detection production line of the embodiment of the utility model;

[0024] Figure 3 It is a front view structure schematic diagram of the air tightness detection device of the embodiment of the utility model;

[0025] Figure 4 It is a three-dimensional structure schematic diagram of the air tightness detection device of the embodiment of the utility model;

[0026] Figure 5 It is a three-dimensional structure schematic diagram of the compression detection mechanism of the air tightness detection device of the embodiment of the utility model;

[0027] Figure 6 It is a three-dimensional structure schematic diagram of the compression assembly of the compression detection mechanism of the embodiment of the utility model;

[0028] Figure 7 It is a three-dimensional structure schematic diagram of the conveying device of the embodiment of the utility model;

[0029] Figure 8 It is a three-dimensional structure schematic diagram of the first carrying manipulator and the second carrying manipulator of the embodiment of the utility model;

[0030] The numbers in the figure represent:

[0031] 100-battery box upper shell after welding air tightness detection production line, 700-upper cover, 800-bottom plate, 900-battery box upper shell;

[0032] 1-air tightness detection device, 11-frame, 12-pressing detection mechanism, 121-second driving member, 122-first mounting bracket, 123-upper profiling boss, 1231-second sealing strip, 1232-third air hole, 124-pressing assembly, 1241-connecting rod, 1242-pressing strip, 1243-spring, 13-positioning support mechanism, 131-second positioning pin, 132-support column, 133-supporting table, 1331-first sealing strip, 134-lower profiling boss, 1341-first air hole, 1342-second air hole, 1343-receiving groove, 14-moving platform, 15-first driving member;

[0033] 2-conveying device, 21-conveying line, 22-positioning mechanism, 221-positioning seat, 222-first positioning pin, 223-first positioning support;

[0034] 3-discharging station, 31-finished product station, 32-defective product station;

[0035] 4-feeding device, 41-first movable ground rail, 42-first carrying manipulator, 421-gripper frame, 422-positioning assembly, 4221-fourth driving member, 4222-third positioning pin, 423-suction assembly, 4231-mounting seat, 4232-suction cup, 424-clamping assembly, 4241-second mounting bracket, 4242-pressing rod, 4243-third driving member, 4244-rotating rod, 4245-supporting rod;

[0036] 5-receiving device, 51-second movable ground rail, 52-second carrying manipulator. DETAILED DESCRIPTION

[0037] Please refer to Figures 1-8 The embodiment is a battery box upper shell air tightness detection production line after welding. The battery box upper shell air tightness detection production line after welding 100 comprises a plurality of air tightness detection devices 1 arranged in front and back, a conveying device 2 located at the left front side of the air tightness detection device 1 and used for conveying the battery box upper shell 900 after welding, a discharging station 3 located at the right side of the air tightness detection device 1, a feeding device 4 located at the left side of the air tightness detection device 1 and used for carrying the battery box upper shell 900 on the conveying device 2 to the air tightness detection device 1, and a receiving device 5 located between the air tightness detection device 1 and the discharging station 3 and used for carrying the battery box upper shell 900 after detection on the air tightness detection device 1 to the discharging station 3.

[0038] Since the welding device of the upper shell 900 of the battery box is arranged at the left side of the air tightness detection device 1, the upper cover 700 is welded above one end of the bottom plate 800, and an annular welding seam is formed at the front end of the bottom plate 800; therefore, the conveying device 2 is arranged at the left front side of the air tightness detection device 1, and the layout is compact and reasonable, and the occupied space is small.

[0039] The conveying device 2 comprises a conveying line 21 and a positioning mechanism 22 installed above the conveying line 21 and used for positioning the upper shell 900 of the battery box; the positioning mechanism 22 comprises a positioning seat 221, a plurality of first positioning pins 222 arranged on the positioning seat 221 and extending into the positioning holes of the upper shell 900 of the battery box to realize positioning, and a plurality of first positioning supports 223 arranged on the positioning seat 221 and used for supporting the upper shell 900 of the battery box; when the upper shell 900 of the battery box welded is carried to the positioning mechanism 22, the plurality of first positioning pins 222 extend into the positioning holes of the upper shell 900 of the battery box, and the plurality of first positioning supports 223 support the lower surface of the upper shell 900 of the battery box at the same time, so as to realize positioning of the conveying of the upper shell 900 of the battery box.

[0040] In the embodiment, three air tightness detection devices 1 are arranged, which can improve the detection efficiency. The air tightness detection device 1 comprises a rack 11, a pressing detection mechanism 12 arranged at one end of the rack 11 and used for pressing the upper shell 900 of the battery box and performing air tightness detection, a positioning support mechanism 13 used for positioning and supporting the upper shell 900 of the battery box, a moving platform 14 used for mounting the positioning support mechanism 13, and a first driving member 15 arranged on the rack 11 and used for driving the linear motion of the moving platform 14 so that the welding seam to be detected of the upper shell 900 of the battery box on the positioning support mechanism 13 is located directly below the pressing detection mechanism 12.

[0041] The positioning support mechanism 13 comprises a plurality of second positioning pins 131 extending into the positioning holes of the upper shell 900 of the battery box to realize positioning, a plurality of support columns 132 used for supporting the rear end of the upper shell 900 of the battery box, a support table 133 used for supporting the welding position of the front end of the upper shell 900 of the battery box, and a lower profiling boss 134 arranged on the support table 133 and profiled with the inner cavity of the upper cover 700; the support table 133 is provided with a first sealing strip 1331 profiled with the lower surface of the lower shell 900 of the battery box to realize sealing, and the lower profiling boss 134 comprises a plurality of first air holes 1341 arranged on the upper surface, a plurality of second air holes 1342 arranged on the side and communicated with the first air holes 1341, and a containing groove 1343 arranged on the upper surface.

[0042] The compacting detection mechanism 12 comprises a second driving member 121 fixed on the frame 11, a first mounting frame 122 driven by the second driving member 121 to move up and down, an upper profiling boss 123 fixed on the lower surface of the first mounting frame 122 and achieving sealing with the top end of the upper cover 700 of the battery box upper shell 900, and a plurality of compacting assemblies 124 fixed on the lower surface of the first mounting frame 122 and used for compacting at the joint of the upper cover 700 and the bottom plate 800. The upper profiling boss 123 comprises a second sealing strip 1231 extending into the accommodating groove 1343 to achieve sealing among the upper profiling boss 123, the lower profiling boss 134 and the battery box upper shell 900, and a third vent hole 1232 communicating with the first vent hole 1341, and a vent valve is arranged on the upper profiling boss 123 and communicates with the third vent hole 1232.

[0043] The plurality of compacting assemblies 124 are annularly distributed on the outer periphery of the upper profiling boss 123 and surround to form an annular structure profiled with the weld, and each compacting assembly 124 comprises a connecting rod 1241 and a compacting strip 1242 fixed on the lower end of the connecting rod 1241 and used for compacting at the joint of the upper cover 700 and the bottom plate 800. One compacting strip 1242 is fixed on the lower end of each two connecting rods 1241, the plurality of compacting strips 1242 surround to form an annular structure profiled with the weld and compact at the joint of the upper cover 700 and the bottom plate 800, and a spring 1243 is sleeved on the outer periphery of the connecting rod 1241. The spring 1243 can also ensure that the pressure is not too large to cause too much compacting or over-pressing, and prevent deformation around the weld.

[0044] After the battery box upper shell 900 is placed in place, the lower end of the battery box upper shell 900 is tightly pressed on the first sealing strip 1331 to achieve sealing between the battery box upper shell 900 and the lower profiling boss 134, the second driving member 121 drives the first mounting frame 122 to drive the upper profiling boss 123 and the lower profiling boss 134 to be positioned by being buckled from top to bottom, the second sealing strip 1231 extends into the accommodating groove 1343 to achieve sealing among the lower profiling boss 134, the upper profiling boss 123 and the battery box upper shell 900, the bottom of the lower profiling boss 134 forms a sealed cavity with the upper cover 700, the bottom plate 800 and the weld, and a gas flow channel is formed between the upper profiling boss 123 and the lower profiling boss 134, from the vent valve into the third vent hole 1232, from the third vent hole 1232 into the first vent hole 1341, from the first vent hole 1341 into the second vent hole 1342, and from the second vent hole 1342 into the sealed cavity. After the vent valve is inflated, the gas leakage value in the sealed cavity is detected. If the leakage value exceeds the range, there is gas leakage at the weld, indicating that the welding is abnormal. If the leakage value in the cavity is within the range, there is no gas leakage at the weld, indicating that the welding is normal.

[0045] The unloading station 3 is provided with a finished product station 31 for placing good products and a defective product station 32 for placing defective products. The battery box upper shell 900 on the finished product station 31 awaits subsequent operations, and the battery box upper shell 900 on the defective product station 32 awaits subsequent inspection.

[0046] The loading device 4 includes a first movable ground rail 41 arranged in the front and rear and a first transport robot 42 slidably arranged on the first movable ground rail 41. The first movable ground rail 41 is arranged so that the loading device 4 can move forward and backward to transport the battery box upper shell 900 on the conveying device 2 to different airtightness detection devices 1. Testing with multiple airtightness detection devices 1 can improve the efficiency of testing and save transport robots.

[0047] The material receiving device 5 includes a second movable ground rail 51 arranged in the front and rear and a second transport robot 52 slidably arranged on the second movable ground rail 51. The second movable ground rail 51 is arranged so that the material receiving device 5 can move forward and backward to transport the battery box upper shell 900 on different airtightness detection devices 1 to the unloading station 3, thereby improving work efficiency and saving transport robots.

[0048] The first handling robot 42 and the second handling robot 52 have the same structure and both include a gripping frame 421, a plurality of positioning components 422 arranged on the gripping frame 421 and used to realize the positioning of the battery box upper shell 900, a plurality of adsorption components 423 arranged on the gripping frame 421 and used to adsorb the upper surface of the battery box upper shell 900, and a plurality of clamping components 424 arranged on the gripping frame 421 and used to clamp the outer peripheral edge of the battery box upper shell 900.

[0049] The positioning assembly 422 includes a fourth driving member 4221 and a third positioning pin 4222 that is driven by the fourth driving member 4221 to move up and down and extends into the positioning hole of the battery box upper shell 900. The two positioning assemblies 422 are arranged at both ends of the battery box upper shell 900, which can ensure the accuracy and precision of positioning.

[0050] The adsorption component 423 includes a mounting base 4231 and a suction cup 4232 fixed to the lower end of the mounting base 4231. When the clamping component 424 clamps the edge of the battery box upper shell 900, since the base plate 800 is large in size and plate-shaped, in order to prevent the middle area of ​​the battery box upper shell 900 from collapsing downward, the gripping frame 421 is provided with several suction cups 4232 in the middle area of ​​the battery box upper shell 900 to adsorb the middle area of ​​the battery box upper shell 900, which can ensure that the battery box upper shell 900 remains flat during grasping and avoids collapsing downward.

[0051] The clamping assembly 424 includes a second mounting frame 4241 fixed to the lower surface of the gripping frame 421, a clamping rod 4242 fixed on the second mounting frame 4241 and used to press the upper surface of the battery box upper shell 900, a third driving member 4243 fixed on the second mounting frame 4241, and a rotating rod 4244 driven by the third driving member 4243 to rotate and extend into the lower surface of the battery box upper shell 900, and a support rod 4245 fixed at the end of the rotating rod 4244 and located directly below the clamping rod 4242; several clamping assemblies 424 are surrounded by the outer periphery of the battery box upper shell 900 to maintain stability during grasping.

[0052] The present invention provides a production line for air tightness detection of the upper shell of the battery box after welding, and its working process is as follows: the welded upper shell of the battery box 900 is placed on the conveying device 2 and conveyed to the front of the air tightness detection device 1, the first handling robot 42 moves to the side of the conveying device 2 on the first movable ground rail 41, and places the upper shell of the battery box 900 on the positioning support mechanism 13 of the air tightness detection device 1, the second positioning pin 131 is inserted into the positioning hole of the upper shell of the battery box 900 to achieve positioning, and the rear end of the upper shell of the battery box 900 is supported by several support columns 132, and at the same time, the front end of the upper shell of the battery box 900 falls on the support platform 133 and the lower end is pressed tightly on the first sealing strip 1331, the upper cover 700 of the upper shell of the battery box 900 falls on the lower contoured boss 134 and forms a seal, after the upper shell of the battery box 900 is positioned and supported, the first drive The moving part 15 drives the moving platform 14 to move so that the lower contoured boss 134 on the positioning support mechanism 13 is located just below the clamping detection mechanism 12. The clamping detection mechanism 12 starts to work, and the second driving part 121 drives the first mounting frame 122 to descend, driving the upper contoured boss 123 and the lower contoured boss 134 to achieve upper and lower buckling and sealing. At the same time, the clamping strips 1242 of several clamping assemblies 124 are completely pressed against the overlap between the upper cover 700 and the bottom plate 800, inflating the vent valve, and the gas enters the sealed cavity through the gas flow channel to detect gas leakage in the sealed cavity. When the leakage value is within the normal range, it is a finished product. The second handling robot 52 transports the finished product to the finished product station 31. If the leakage value is not within the normal range, it is a defective product. The second handling robot 52 transports the defective product to the defective product station 32 for subsequent detection and confirmation.

[0053] The above descriptions are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A battery box upper shell after welding air tightness detection production line, characterized by: It includes several air-tightness detection devices arranged in front and back, a conveying device located on the left front side of the air-tightness detection device and used to convey the welded upper shell of the battery box, a unloading station located on the right side of the air-tightness detection device, a loading device located on the left side of the air-tightness detection device and used to transport the upper shell of the battery box on the conveying device to the air-tightness detection device, and a receiving device located between the air-tightness detection device and the unloading station and used to transport the upper shell of the battery box that has been tested on the air-tightness detection device to the unloading station.

2. A battery box upper shell post-weld airtightness testing production line according to claim 1, characterized in that: The conveying device includes a conveying line and a positioning mechanism installed above the conveying line and used to position the upper shell of the battery box; the positioning mechanism includes a positioning seat, a plurality of first positioning pins arranged on the positioning seat and extending into the positioning holes of the upper shell of the battery box to achieve positioning, and a plurality of first positioning supports arranged on the positioning seat and supporting the upper shell of the battery box.

3. The battery box upper shell airtightness detection production line after welding according to claim 1, characterized in that: The airtightness detection device includes a frame, a pressing detection mechanism arranged at one end of the frame and used to press the battery box shell and perform airtightness detection, a positioning support mechanism used to position and support the upper shell of the battery box, a mobile platform for installing the positioning support mechanism, and a first driving member arranged on the frame and used to drive the mobile platform to move linearly so that the position to be detected of the upper shell of the battery box is located directly below the pressing detection mechanism.

4. A battery box upper shell post-weld airtightness testing production line according to claim 3, characterized in that: The positioning support mechanism includes a plurality of second positioning pins that extend into the positioning holes of the upper shell of the battery box to achieve positioning, a plurality of support columns for supporting the rear end of the upper shell of the battery box, a support platform for supporting the welding position of the upper shell of the battery box, and a lower contoured boss arranged on the support platform and contoured to the inner cavity of the upper shell of the battery box.

5. A battery box upper shell post-weld airtightness testing production line according to claim 4, characterized in that: The support platform is provided with a first sealing strip that is shaped like the lower surface of the lower shell of the battery box to achieve sealing; the lower shaped boss includes a plurality of first vent holes provided on the upper surface, a plurality of second vent holes provided on the side and connected to the first vent holes, and a accommodating groove provided on the upper surface.

6. A battery box upper shell post-weld airtightness testing production line according to claim 5, characterized in that: The compression detection mechanism includes a second driving member fixed on the frame, a first mounting frame driven by the second driving member to move up and down, an upper contoured boss fixed on the lower surface of the first mounting frame and sealed with the top of the upper shell of the battery box, and several compression components fixed on the lower surface of the first mounting frame for compressing one side of the weld.

7. A battery box upper shell post-weld airtightness testing production line according to claim 6, characterized in that: The upper contoured boss includes a second sealing strip extending into the accommodating groove to achieve sealing between the upper contoured boss, the lower contoured boss and the upper shell of the battery box, and a third vent hole connected to the first vent hole. After the upper contoured boss and the lower contoured boss are snapped together and positioned and sealed, the bottom of the lower contoured boss, the two welded upper covers and bottom plates, and the weld form a sealed cavity. A gas flow channel is formed between the upper contoured boss and the lower contoured boss, which allows gas to flow from the third vent hole into the first vent hole, enter the second vent hole through the first vent hole, and then enter the sealed cavity through the second vent hole.

8. The battery box upper shell post-weld airtightness testing production line according to claim 1, characterized in that: The unloading station is provided with a finished product station for placing good products and a defective product station for placing defective products.

9. The battery box upper shell post-weld airtightness testing production line according to claim 1, characterized in that: The loading device includes a first movable ground rail arranged in front and back and a first handling robot slidably arranged on the first movable ground rail; the receiving device includes a second movable ground rail arranged in front and back and a second handling robot slidably arranged on the second movable ground rail.

10. A battery box upper shell post-weld airtightness testing production line according to claim 9, characterized in that: The first handling robot and the second handling robot have the same structure and both include a gripper frame, a plurality of positioning components arranged on the gripper frame and used to position the upper shell of the battery box, a plurality of adsorption components arranged on the gripper frame and used to adsorb the upper surface of the upper shell of the battery box, and a plurality of clamping components arranged on the gripper frame and used to clamp the outer peripheral edge of the upper shell of the battery box.

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