A gas-tightness detection device for battery production

Abstract

The present invention discloses an airtightness detection device for battery production, which belongs to the field of airtightness detection technology. An inner conveying structure is arranged between the outer conveying structures, and the detection mechanism is installed in the middle of the conveying mechanism through a mounting frame; a screw is fixedly arranged at the bottom of the driving gear, and two groups of tooth plates meshing with the driving gear are slidably arranged on the top inner wall of the mounting frame, and the outer sides of the two groups of tooth plates are respectively fixedly connected with a first sealing cover and a second sealing cover that cooperate with each other; an injection nozzle is slidably installed in the arc cavity, and a lifting cavity that cooperates with the screw thread is opened on the top of the injection nozzle. The present invention can quickly position the first sealing cover and the second sealing cover through a locking frame and a locking block. When the locking motor drives the gear ring to rotate, the gear ring will squeeze the locking rod, and at this time the locking rod passes through the lower lock hole and the upper lock hole to lock the locking block again. When the gear ring is separated from the locking rod, the locking rod returns to its original state under the action of the reset spring to complete the unlocking, which improves the sealing effect and locking strength.

Description

Technical Field

[0001] The invention relates to the technical field of airtightness detection, in particular to an airtightness detection device used for battery production. Background Art

[0002] With the continuous development of new energy battery technology, the performance of battery packs is also constantly improving; the energy density of battery packs is getting higher and higher, which can provide greater power or driving range. At the same time, the size of battery packs is getting smaller and smaller, and the weight is getting lighter and lighter, which is easy to carry or install. Correspondingly, the safety requirements of battery packs are getting higher and higher, and stronger protection measures are needed. The power battery module includes a battery container assembly, a battery pack, a power connector, a power connection line, a wiring harness buckle and a signal acquisition assembly. In order to make the battery container assembly convenient to expand the number of batteries and the connection form according to the actual needs of customers for the power battery module, and in order to avoid leakage of the battery module causing the airtightness to fail to meet the standard, it is necessary to perform airtightness testing on the power battery module.

[0003] The patent application with publication number CN117213734A discloses a power battery module airtightness detection device and method, the power battery module airtightness detection device comprises a base, the top of the base is fixedly connected with a mounting frame, the top of the base and the bottom of the mounting frame are fixedly connected with a fixing device, the top of the mounting frame is provided with a detection device, one side of the detection device and the middle of the mounting frame is fixedly connected with an electric telescopic rod, the bottom of the electric telescopic rod is fixedly connected with an inflatable hood, and the two sides of the electric telescopic rod are provided with an inflatable device. Through the coordinated use of the inflatable hood, the inflatable device, the inflatable tube, the rotating rod, the rotating block, the first dehumidification net, the filter plate, the second dehumidification net, the fan, and the heating block, it is convenient to dry the air in the inflatable hood, and it is convenient to perform airtightness detection on the battery module, and the detection effect of the battery module will not be affected by dust and humidity in the air, and it is convenient to use the unloading assembly to fix the workpiece, and the workpiece is transported from the workbench through the transport assembly.

[0004] However, the processing efficiency of the battery airtightness detection equipment disclosed above is average, and the battery needs to be manually placed and taken, which is time-consuming and labor-intensive, has a low degree of automation, and lacks an efficient conveying structure. In addition, the stability and strength of the inflatable hood are average, and there is a risk of leakage when the internal pressure is too high. Summary of the invention

[0005] The purpose of the present invention is to provide an airtight detection device for battery production in order to solve the problems that the processing efficiency of existing battery airtight detection equipment is average, the battery needs to be manually picked up and placed, which is time-consuming and labor-intensive, the degree of automation is low, and an efficient conveying structure is lacking. In addition, the stability and strength of the inflation hood are average, and when the internal pressure is too high, there is a risk of leakage.

[0006] To achieve the above-mentioned purpose, the technical solution of the present invention is: an airtight detection device for battery production, comprising a conveying mechanism and a detection mechanism, the conveying mechanism comprising outer conveying structures on both sides, an inner conveying structure is arranged between the outer conveying structures, the middle part of the inner conveying structure is higher than the outer conveying structure, and multiple groups of boxes to be tested are placed at intervals between the outer conveying structures; the detection mechanism comprises a mounting frame, and the detection mechanism is installed in the middle part of the conveying mechanism through the mounting frame; a clamping motor is installed on the top of the mounting frame, a driving gear is installed on the output end of the clamping motor, and the bottom of the driving gear is fixedly arranged There is a screw; two groups of tooth plates meshing with the driving gear are slidably arranged on the top inner wall of the installation frame, and the outer sides of the two groups of tooth plates are respectively fixedly connected with a first sealing cover and a second sealing cover that cooperate with each other; support plates are arranged on the front and rear sides of the installation frame, and the inner side of the support plate is connected to a limiting plate, and an arc-shaped cavity is opened in the middle of the limiting plate, and an air injection nozzle is slidably installed in the arc-shaped cavity, and a lifting cavity that cooperates with the screw thread is opened on the top of the air injection nozzle; when the first sealing cover and the second sealing cover on both sides of the driving gear drive the test box body to clamp and seal it, the air injection nozzle moves downward and inflates its interior.

[0007] As a further solution of the present invention: the outer conveying structure includes multiple groups of first conveying rollers, the inner conveying structure includes multiple groups of second conveying rollers, and both sides of the second conveying rollers are provided with contraction parts that cooperate with the first sealing cover and the second sealing cover.

[0008] As a further solution of the present invention: vertical connecting plates are arranged on the outer walls of the first sealing cover and the second sealing cover, the tooth plate is respectively connected to the first sealing cover and the second sealing cover through the connecting plates, and hollow parts are opened on both sides of the installation frame.

[0009] As a further solution of the present invention: the top of the first sealing cover and the second sealing cover is provided with an injection ring that cooperates with the injection nozzle, and the inside of the injection nozzle is also provided with an injection cavity, and the top of the mounting frame is also installed with an air pump, and the air pump is connected to the injection cavity through a hose.

[0010] As a further solution of the present invention: locking frames are arranged on both sides of the first sealing cover, and locking blocks cooperating therewith are arranged on both sides of the second sealing cover; a lower locking hole is arranged through the bottom of the locking frame, and an upper locking hole coaxial with the locking block is arranged inside the locking block, and locking rods are slidably arranged in the lower locking hole and the upper locking hole, and multiple groups of mounting bosses are arranged on the outer wall of the locking rod, and a reset spring is connected to the top of the mounting boss, and the locking rod is connected to the bottom of the locking frame through the reset spring.

[0011] As a further solution of the present invention: a symmetrical convex plate is arranged on the outer wall of the second sealing cover, a gear ring cooperating with the locking rod is movably arranged on the bottom of the convex plate, and a symmetrical mounting boss 2 is also arranged on the outer wall of the second sealing cover, a locking motor is installed on the mounting boss 2, and a driving gear meshing with the gear ring is installed at the output end of the locking motor.

[0012] As a further solution of the present invention: a sliding groove is opened on the top inner wall of the installation frame, and a sliding seat cooperating therewith is arranged on the top of the tooth plate; symmetrical sliding arms are arranged on the outer wall of the gas injection nozzle, and symmetrical limiting grooves are opened on the inner wall of the arc-shaped cavity.

[0013] As a further solution of the present invention: a positioning frame cooperating with the test box body is arranged inside the first sealing cover and the second sealing cover, and a sensor is also installed on the inner wall of the first sealing cover.

[0014] As a further solution of the present invention: a plurality of groups of rubber rings are arranged on the inner wall of the gas injection ring.

[0015] As a further solution of the present invention: rounded corners are further provided on both sides of the gear ring.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The present invention can lift the box body to be tested from the middle through the cooperation of the external conveying structure and the internal conveying structure. When the active gear drives the first sealing cover and the second sealing cover on both sides to clamp and seal the box body to be tested, under the cooperation of the screw and the lifting chamber, the gas injection nozzle moves downward and passes through the gas injection ring to inflate the interior of the box body to be tested, and the air pressure in the first sealing cover and the second sealing cover is detected by the sensor to further judge the airtightness of the box body to be tested. The design is ingenious and effective, which greatly improves the stability and practicality of the airtightness detection equipment for battery production.

[0018] 2. The present invention can quickly lock and position the first sealing cover and the second sealing cover on both sides through the cooperation of the locking frame and the locking block. When the locking motor drives the gear ring to rotate, the gear ring will press the locking rod upward. At this time, the locking rod passes through the lower lock hole and the upper lock hole in turn to lock the locking block again. When the gear ring is separated from the locking rod, the locking rod automatically separates from the upper lock hole and returns to its original state under the action of the reset spring to complete the unlocking. This design further improves the sealing effect and strength of the airtight detection equipment for battery production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further explained below in conjunction with the accompanying drawings and embodiments:

[0020] Figure 1 It is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 It is a partial three-dimensional structural diagram of the conveying mechanism in the present invention;

[0022] Figure 3 is a partial cross-sectional view of the conveying mechanism of the present invention;

[0023] Figure 4 It is a three-dimensional structural diagram of the detection mechanism in the present invention;

[0024] Figure 5 It is a three-dimensional structural diagram of the installation frame in the present invention;

[0025] Figure 6 It is the internal structure diagram of the detection mechanism in the present invention;

[0026] Figure 7 is a cross-sectional view of the detection mechanism of the present invention;

[0027] Figure 8 is a cross-sectional view of the gas injection nozzle of the present invention;

[0028] Fig. 9 It is a partial cross-sectional view of the detection mechanism in the present invention.

[0029] Description of reference numerals:

[0030] 1. Conveying mechanism; 101. External conveying structure; 102. Internal conveying structure; 103. First conveying roller; 104. Second conveying roller; 105. Contraction part; 106. Detection box body; 2. Detection mechanism; 201. Mounting frame; 202. Clamping motor; 203. Driving gear; 204. Screw; 205. Tooth plate; 206. Slide; 207. Slide seat; 208. Connecting plate; 209. Hollowing part; 210. First sealing cover; 211. Second sealing cover; 212. Support plate; 213. Limiting plate; 214. Arc cavity; 215. Injection nozzle; 216, sliding arm; 217, limiting groove; 218, lifting chamber; 219, injection chamber; 220, hose; 221, air pump; 222, injection ring; 223, positioning frame; 224, sensor; 225, locking frame; 226, locking block; 227, lower locking hole; 228, upper locking hole; 229, locking rod; 230, mounting boss 1; 231, return spring; 232, rubber ring; 233, convex plate; 234, gear ring; 235, fillet; 236, mounting boss 2; 237, locking motor; 238, driving gear. DETAILED DESCRIPTION

[0031] The following will be combined with the attached Figures 1 to 9The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention provides an airtight detection device for battery production through improvement. Figure 1-Figure 9 As shown, it includes a conveying mechanism 1 and a detection mechanism 2. The conveying mechanism 1 includes an outer conveying structure 101 on both sides, an inner conveying structure 102 is arranged between the outer conveying structures 101, the middle part of the inner conveying structure 102 is higher than the outer conveying structure 101, and multiple groups of test boxes 106 are placed between the outer conveying structures 101; the detection mechanism 2 includes a mounting frame 201, and the detection mechanism 2 is installed in the middle of the conveying mechanism 1 through the mounting frame 201; a clamping motor 202 is installed on the top of the mounting frame 201, and a driving gear 203 is installed at the output end of the clamping motor 202, and a screw 204 is fixedly arranged at the bottom of the driving gear 203; two groups of The toothed plate 205 meshing with the driving gear 203, the outer sides of the two groups of toothed plates 205 are respectively fixedly connected with the first sealing cover 210 and the second sealing cover 211 which cooperate with each other; the front and rear sides of the mounting frame 201 are provided with support plates 212, the inner side of the support plate 212 is connected with the limiting plate 213, the middle part of the limiting plate 213 is provided with an arc-shaped cavity 214, the arc-shaped cavity 214 is slidably installed with an injection nozzle 215, and the top of the injection nozzle 215 is provided with a lifting cavity 218 which cooperates with the thread of the screw 204; when the driving gear 203 drives the first sealing cover 210 and the second sealing cover 211 on both sides to clamp and seal the box body 106 to be tested, the injection nozzle 215 moves downward and inflates the inside thereof.

[0033] In this embodiment: the airtight detection device for battery production is mainly divided into two parts: a conveying mechanism 1 and a detection mechanism 2. When the device is in use, the box body 106 to be tested is first placed on the outer conveying structure 101 in sequence. Under the conveyance of the outer conveying structures 101 on both sides, the box body 106 to be tested approaches the middle. Since the middle of the inner conveying structure 102 is slightly higher than the outer conveying structure 101, under the conveyance of the inner conveying structure 102, the two sides of the box body 106 to be tested are suspended. At this time, the outer conveying structure 101 and the inner conveying structure 102 are stopped and tested. During the detection process, the tooth plates 205 on both sides drive the first sealing cover 210 and the second sealing cover 211 on both sides to move closer to the middle, and the locking blocks 226 on both sides of the second sealing cover 211 will be inserted into the locking frames 225 on both sides of the first sealing cover 210 to complete the preliminary locking. At this time, under the action of the reset spring 231, the locking rod 229 will not be inserted into the locking block 226. When the locking motor 237 drives the gear ring 234 to rotate outward through the driving gear 238, the gear ring 234 will press the locking rod 229 upward, and the locking rod 229 will move upward and pass through the lower locking hole 227 and the upper locking hole 228 in sequence to complete the re-locking. At the same time, with the cooperation of the screw 204 and the lifting chamber 218, the gas injection nozzle 215 moves downward and passes through the gas injection ring 222 to inflate the inside of the test box body 106. When the sensor 224 detects that the air pressure in the first sealing cover 210 and the second sealing cover 211 has not changed, it proves that the sealing performance of the test box body 106 is good, otherwise it proves that the test box body 106 has a leak.

[0034] When the test is completed, the locking motor 237 drives the gear ring 234 to rotate inward through the driving gear 238, and the gear ring 234 will be separated from the locking rod 229. At this time, the locking rod 229 is separated from the lower lock hole 227 and the upper lock hole 228 in turn under the action of the reset spring 231 and unlocks. Finally, driven by the tooth plate 205, the first sealing cover 210 and the second sealing cover 211 move to both sides and separate from the box body 106 to be tested. At the same time, under the cooperation of the screw 204 and the lifting chamber 218, the gas injection nozzle 215 moves upward and separates from the gas injection ring 222. Finally, the outer conveying structure 101 and the inner conveying structure 102 are started again to convey the box body 106 to be tested after the test is completed to the next process.

[0035] See attached Figure 2 -Attached Figure 3 The outer conveying structure 101 includes a plurality of first conveying rollers 103 , and the inner conveying structure 102 includes a plurality of second conveying rollers 104 . Both sides of the second conveying rollers 104 are provided with contraction portions 105 that cooperate with the first sealing cover 210 and the second sealing cover 211 .

[0036] In this embodiment: under the transportation of the outer transport structures 101 on both sides, the box body 106 to be tested approaches the middle. Since the middle of the inner transport structure 102 is slightly higher than the outer transport structure 101, and the height difference is approximately the thickness of the bottom inner wall of the first sealing cover 210 and the second sealing cover 211, the two sides of the box body 106 to be tested are suspended under the transportation of the inner transport structure 102. When the first sealing cover 210 and the second sealing cover 211 move closer to the middle, a contraction portion 105 is designed to facilitate the wrapping and sealing of the box body.

[0037] See attached Figure 4 -Attached Figure 5 A vertical connecting plate 208 is provided on the outer wall of the first sealing cover 210 and the second sealing cover 211 , and the tooth plate 205 is connected to the first sealing cover 210 and the second sealing cover 211 respectively through the connecting plate 208 , and hollow portions 209 are opened on both sides of the installation frame 201 .

[0038] In this embodiment, when the tooth plates 205 on both sides drive the first sealing cover 210 and the second sealing cover 211 to reciprocate, in order to avoid obstruction by the two sides of the installation frame 201, a hollow portion 209 is designed.

[0039] See attached Figure 1 and attached Figure 6 -Attached Figure 8 An air injection ring 222 cooperating with the air injection nozzle 215 is provided at the top of the first sealing cover 210 and the second sealing cover 211. An air injection cavity 219 is also opened inside the air injection nozzle 215. An air pump 221 is also installed on the top of the mounting frame 201. The air pump 221 is connected to the air injection cavity 219 through a hose 220.

[0040] In this embodiment, during detection, the air pump 221 inputs gas into the gas injection cavity 219 through the hose 220 , and the gas injection nozzle 215 inputs gas into the box body 106 to be tested through the gas injection cavity 219 .

[0041] See attached Figure 6 -Attached Fig. 9, locking frames 225 are provided on both sides of the first sealing cover 210, and locking blocks 226 cooperating therewith are provided on both sides of the second sealing cover 211; a lower locking hole 227 is provided at the bottom of the locking frame 225, and an upper locking hole 228 coaxial with the locking block 226 is provided inside the locking block 226, and a locking rod 229 is slidably provided in the lower locking hole 227 and the upper locking hole 228, and a plurality of groups of mounting bosses 230 are provided on the outer wall of the locking rod 229, and a reset spring 231 is connected to the top of the mounting boss 230, and the locking rod 229 is connected to the bottom of the locking frame 225 through the reset spring 231. A symmetrical convex plate 233 is provided on the outer wall of the second sealing cover 211, and a gear ring 234 cooperating with the locking rod 229 is movably provided at the bottom of the convex plate 233. A symmetrical mounting boss 236 is also provided on the outer wall of the second sealing cover 211, and a locking motor 237 is installed on the mounting boss 236. A driving gear 238 meshing with the gear ring 234 is installed at the output end of the locking motor 237.

[0042] In this embodiment: during the detection process, when the toothed plates 205 on both sides drive the first sealing cover 210 and the second sealing cover 211 on both sides to move closer to the middle, the locking blocks 226 on both sides of the second sealing cover 211 will be inserted into the locking frames 225 on both sides of the first sealing cover 210 to complete the preliminary locking. At this time, under the action of the reset spring 231, the locking rod 229 will not be inserted into the locking blocks 226. When the locking motor 237 drives the gear ring 234 to rotate outward through the driving gear 238, the gear ring 234 will squeeze the locking rod 229 upward, and the locking rod 229 will move upward and pass through the lower lock hole 227 and the upper lock hole 228 in sequence and complete the re-locking. After the detection is completed, the locking motor 237 drives the gear ring 234 to rotate inward through the driving gear 238, and the gear ring 234 will be separated from the locking rod 229. At this time, the locking rod 229 is separated from the lower lock hole 227 and the upper lock hole 228 in sequence under the action of the reset spring 231 and completes the unlocking. Finally, driven by the tooth plate 205 , the first sealing cover 210 and the second sealing cover 211 move to both sides and separate from the test box body 106 .

[0043] See attached Figure 5 -Attached Figure 6 A slide groove 206 is provided on the top inner wall of the mounting frame 201, and a slide seat 207 cooperating therewith is provided on the top of the tooth plate 205; symmetrical slide arms 216 are provided on the outer wall of the gas injection nozzle 215, and symmetrical limiting grooves 217 are provided on the inner wall of the arc cavity 214.

[0044] In this embodiment, in order to ensure that the tooth plate 205 is meshed with both sides of the driving gear 203, a slide groove 206 structure is designed to slide on the top inner wall of the mounting frame 201. Under the drive of the driving gear 203 and the screw 204, in order to ensure that the gas injection nozzle 215 reciprocates up and down along the arc cavity 214 on the limiting plate 213, so as to achieve gas injection and separation of the box body 106 to be tested, a slide arm 216 and a limiting groove 217 structure are designed.

[0045] See attached Figure 7 A positioning frame 223 that matches the test box body 106 is disposed inside the first sealing cover 210 and the second sealing cover 211 , and a sensor 224 is also installed on the inner wall of the first sealing cover 210 .

[0046] In this embodiment: when the first sealing cover 210 and the second sealing cover 211 on both sides move toward the middle and wrap and seal the box body 106 to be tested, a positioning frame 223 structure is designed to position it and prevent it from displacement. When the sensor 224 detects that the air pressure in the first sealing cover 210 and the second sealing cover 211 has not changed, it proves that the sealing performance of the box body 106 to be tested is good. When the sensor 224 detects that the air pressure in the first sealing cover 210 and the second sealing cover 211 increases, it proves that the box body 106 to be tested has leakage.

[0047] See attached Fig. 9 A plurality of rubber rings 232 are arranged on the inner wall of the gas injection ring 222 .

[0048] In this embodiment, when the gas injection nozzle 215 moves downward and passes through the gas injection ring 222 to perform gas injection testing on the interior of the test box body 106 , a rubber ring 232 is provided on the inner wall of the gas injection ring 222 in order to further improve the sealing performance.

[0049] See attached Figure 6 Rounded corners 235 are also provided on both sides of the gear ring 234 .

[0050] In this embodiment, when the gear ring 234 rotates and presses the locking rod 229, a rounded corner portion 235 is designed to avoid jamming and improve smoothness.

[0051] Working principle of the present invention: When the device is in use, the test box body 106 to be tested is first placed on the outer conveying structure 101 at intervals in sequence. Under the conveyance of the outer conveying structures 101 on both sides, the test box body 106 approaches the middle. Since the middle of the inner conveying structure 102 is slightly higher than the outer conveying structure 101, under the conveyance of the inner conveying structure 102, the two sides of the test box body 106 are suspended. At this time, the outer conveying structure 101 and the inner conveying structure 102 are both stopped and tested. During the detection process, the toothed plates 205 on both sides drive the first sealing cover 210 and the second sealing cover 211 on both sides to move closer to the middle, and the locking blocks 226 on both sides of the second sealing cover 211 will be inserted into the locking frames 225 on both sides of the first sealing cover 210 to complete the preliminary locking. At this time, under the action of the reset spring 231, the locking rod 229 will not be inserted into the locking block 226. When the locking motor 237 drives the gear ring 234 to rotate outward through the driving gear 238, the gear ring 234 will press the locking rod 229 upward, and the locking rod 229 will move upward and pass through the lower lock hole 227 and the upper lock hole 228 in sequence to complete the re-locking. At the same time, under the cooperation of the screw 204 and the lifting chamber 218, the gas injection nozzle 215 moves downward and passes through the gas injection ring 222 to inflate the inside of the box body 106 to be tested. When the sensor 224 detects that the air pressure in the first sealing cover 210 and the second sealing cover 211 has not changed, it proves that the sealing performance of the box body 106 to be tested is good, otherwise it proves that there is leakage in the box body 106 to be tested. After the detection is completed, the locking motor 237 drives the gear ring 234 to rotate inward through the driving gear 238, and the gear ring 234 will be separated from the locking rod 229. At this time, the locking rod 229 is separated from the lower lock hole 227 and the upper lock hole 228 in sequence under the action of the reset spring 231 and completes the unlocking. Finally, driven by the tooth plate 205, the first sealing cover 210 and the second sealing cover 211 move to both sides and separate from the test box body 106. At the same time, with the cooperation of the screw 204 and the lifting chamber 218, the gas injection nozzle 215 moves upward and separates from the gas injection ring 222. Finally, the outer conveying structure 101 and the inner conveying structure 102 are started again to convey the test box body 106 after the test is completed to the next process.

[0052] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and inventive features disclosed herein.

Claims

1. An airtightness detection device for battery production, comprising a conveying mechanism (1) and a detection mechanism (2), characterized in that: The conveying mechanism (1) comprises outer conveying structures (101) on two sides, an inner conveying structure (102) is arranged between the outer conveying structures (101), the middle part of the inner conveying structure (102) is higher than the outer conveying structure (101), and a plurality of groups of test boxes (106) are arranged at intervals between the outer conveying structures (101); The detection mechanism (2) comprises a mounting frame (201), and the detection mechanism (2) is mounted in the middle of the conveying mechanism (1) through the mounting frame (201); a clamping motor (202) is mounted on the top of the mounting frame (201), a driving gear (203) is mounted on the output end of the clamping motor (202), and a screw (204) is fixedly arranged at the bottom of the driving gear (203); two groups of tooth plates (205) meshing with the driving gear (203) are slidably arranged on the inner wall of the top of the mounting frame (201), and the outer sides of the two groups of tooth plates (205) are respectively fixedly connected with a first sealing cover (210) and a second sealing cover (211) that cooperate with each other; Support plates (212) are provided on the front and rear sides of the installation frame (201); a limit plate (213) is connected to the inner side of the support plate (212); an arc-shaped cavity (214) is provided in the middle of the limit plate (213); an air injection nozzle (215) is slidably installed in the arc-shaped cavity (214); a lifting cavity (218) is provided on the top of the air injection nozzle (215) and is threadably matched with the screw rod (204); When the driving gear (203) drives the first sealing cover (210) and the second sealing cover (211) on both sides to clamp and seal the box body (106) to be tested, the gas injection nozzle (215) moves downward and inflates the interior thereof.

2. The airtightness detection device for battery production according to claim 1, characterized in that: The outer conveying structure (101) comprises a plurality of groups of first conveying rollers (103), the inner conveying structure (102) comprises a plurality of groups of second conveying rollers (104), and the second conveying rollers (104) are provided with contraction portions (105) on both sides thereof that cooperate with the first sealing cover (210) and the second sealing cover (211).

3. The airtightness detection device for battery production according to claim 1, characterized in that: Vertical connecting plates (208) are provided on the outer walls of the first sealing cover (210) and the second sealing cover (211); the tooth plate (205) is respectively connected to the first sealing cover (210) and the second sealing cover (211) via the connecting plates (208); and hollow portions (209) are provided on both sides of the installation frame (201).

4. An airtightness detection device for battery production according to any one of claims 1 to 3, characterized in that: An air injection ring (222) cooperating with the air injection nozzle (215) is arranged on the top of the first sealing cover (210) and the second sealing cover (211); an air injection cavity (219) is also provided inside the air injection nozzle (215); an air pump (221) is also installed on the top of the installation frame (201); the air pump (221) is connected to the air injection cavity (219) via a hose (220).

5. An airtightness detection device for battery production according to any one of claims 1 to 3, characterized in that: The first sealing cover (210) is provided with locking frames (225) on both sides, and the second sealing cover (211) is provided with locking blocks (226) matched therewith on both sides; a lower locking hole (227) is provided at the bottom of the locking frame (225), an upper locking hole (228) coaxial with the locking block (226) is provided inside the locking block (226), a locking rod (229) is slidably provided inside the lower locking hole (227) and the upper locking hole (228), a plurality of groups of mounting bosses (230) are provided on the outer wall of the locking rod (229), a return spring (231) is connected to the top of the mounting boss (230), and the locking rod (229) is connected to the bottom of the locking frame (225) via the return spring (231).

6. The airtightness detection device for battery production according to claim 5, characterized in that: A symmetrical convex plate (233) is provided on the outer wall of the second sealing cover (211), and a gear ring (234) cooperating with the locking rod (229) is movably provided at the bottom of the convex plate (233). A symmetrical mounting boss 2 (236) is also provided on the outer wall of the second sealing cover (211), and a locking motor (237) is mounted on the mounting boss 2 (236). A driving gear (238) meshing with the gear ring (234) is mounted on the output end of the locking motor (237).

7. An airtightness detection device for battery production according to any one of claims 1 to 3, characterized in that: A sliding groove (206) is provided on the inner wall at the top of the installation frame (201), and a sliding seat (207) cooperating therewith is provided on the top of the tooth plate (205); symmetrical sliding arms (216) are provided on the outer wall of the gas injection nozzle (215), and symmetrical limiting grooves (217) are provided on the inner wall of the arc-shaped cavity (214).

8. An airtightness detection device for battery production according to any one of claims 1 to 3, characterized in that: A positioning frame (223) cooperating with the test box body (106) is arranged inside the first sealing cover (210) and the second sealing cover (211), and a sensor (224) is also installed on the inner wall of the first sealing cover (210).

9. The airtightness detection device for battery production according to claim 4, characterized in that: A plurality of groups of rubber rings (232) are arranged on the inner wall of the gas injection ring (222).

10. The airtightness detection device for battery production according to claim 6, characterized in that: Rounded corners (235) are also provided on both sides of the gear ring (234).

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