Semi-finished battery unit cell air tightness detection device and method

Abstract

The invention discloses a semi-finished battery unit cell airtightness detection device and method, and the device comprises a workbench, the workbench is horizontally provided with a conveying line, one side of the conveying line is provided with a guide plate in parallel, and the workbench is provided with a first detection station and a second detection station corresponding to the conveying direction of the conveying line; the two sets of lifting detection mechanisms are installed on the workbench corresponding to the first detection station and the second detection station respectively, each lifting detection mechanism is provided with a plurality of detection heads, and the detection heads are connected with liquid injection holes and balance holes in a sealed battery cover in a pressing mode. The lifting detection mechanism on the first detection station performs air tightness detection on part of unit cells of the to-be-detected battery, and the lifting detection mechanism on the second detection station performs air tightness detection on the rest unit cells of the to-be-detected battery; the positioning stopping mechanism is installed on the other side of the conveying line and used for positioning the positions of the to-be-detected batteries on the first detection station and the second detection station, and the battery detection device is accurate in detection and high in efficiency.

Description

Technical Field

[0001] The invention belongs to the technical field of battery production, and in particular relates to a device and method for detecting the air tightness of a semi-finished battery cell. Background Art

[0002] The slot and cover of the lead-acid battery are mainly made of thermoplastic synthetic resin PP. The sealing of the two is mainly achieved by melting the slot and cover at specific positions to form a single sealed space. The sealing of the battery slot and cover is a very critical process. If the sealing is not good, it will lead to battery leakage, gas leakage, acid leakage and other undesirable phenomena, which will have an irreversible impact on the overall performance and service life of the battery.

[0003] The existing method for testing the airtightness of semi-finished single cells of battery slots and covers after heat sealing is to cover the top of the battery cover with a whole soft plastic plate, and then pump air to test the airtightness. Although this method is simple and easy to operate, using the whole soft plastic plate to squeeze the top of the battery cover will also apply pressure to the poorly heat-sealed position. This pressure may cause a false seal to form at the poorly heat-sealed position, thereby misjudging it as qualified for airtightness, causing a risk of leakage before the battery leaves the factory.

[0004] Therefore, how to provide a semi-finished battery cell airtightness detection device and method is a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] In view of this, the present invention provides a semi-finished battery cell airtightness detection device and method, which changes the traditional overall extrusion method into a local extrusion detection method, thereby avoiding the misjudgment of poor airtightness caused by overall extrusion as qualified airtightness, thereby improving the accuracy of airtightness detection and improving product safety.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: a semi-finished battery cell air tightness detection device, comprising:

[0007] A workbench, wherein a conveyor line is horizontally arranged on the workbench, a guide plate is arranged in parallel on one side of the conveyor line, the conveyor line is used to sequentially convey the batteries to be tested, and the workbench is provided with a first inspection station and a second inspection station corresponding to the conveying direction of the conveyor line;

[0008] A lifting detection mechanism, wherein the lifting detection mechanism has two groups and is respectively installed on the workbench corresponding to the first detection station and the second detection station, each of the lifting detection mechanisms is provided with a plurality of detection heads, and the detection heads are crimped and sealed with the injection holes and the balance holes on the battery cover, the lifting detection mechanism on the first detection station is used for air tightness detection of some cells of the battery to be tested, and the lifting detection mechanism on the second detection station is used for air tightness detection of the remaining cells of the battery to be tested;

[0009] A positioning and stopping mechanism is installed on the other side of the conveyor line, and is used to locate the position of the battery to be tested at the first testing station and the second testing station.

[0010] The beneficial effects of the present invention are as follows: the conveyor line is a carrier for the transportation of the battery to be tested, and is divided into a first inspection station and a second inspection station. The first inspection station is used to perform airtightness inspection on part of the cells of the battery to be tested, while the second inspection station is used to perform airtightness inspection on the remaining cells of the battery to be tested. Compared with the traditional overall extrusion method, it is changed to a local extrusion inspection method to avoid the occurrence of poor airtightness caused by overall extrusion being misjudged as qualified airtightness, thereby improving the accuracy of airtightness inspection and improving the safety of the product. It can be understood that the multiple inspection heads on the lifting inspection mechanism are lowered to closely contact the injection holes and balance holes on the cells to ensure the closed state of the cells. The external air source pressurizes the cells through the inspection heads, and the pressure detection state on the inspection heads can be used to know whether the airtightness of the cells is good. The positioning stop mechanism is used to limit the position of the battery to be tested on the conveyor line to ensure the smooth progress of the inspection process at different stations.

[0011] Preferably, the conveyor line is a roller conveyor line, arc-shaped guide sections are provided at both ends of the guide plate, and a start button and an emergency stop button for controlling the lifting detection mechanism and the working state of the conveyor line are provided on the workbench.

[0012] The resulting technical effect is that the arc-shaped introduction section facilitates the pre-adjustment of the position of the battery to be tested on the conveyor line, and facilitates the subsequent positioning and stopping mechanism to position it.

[0013] Preferably, the lifting and detecting mechanism is located above the conveyor line, and the lifting and detecting mechanism includes a lifting cylinder, a fixed frame, a guide piston rod and a detection head. The fixed end of the lifting cylinder is connected to the fixed frame, and the free end of the lifting cylinder is fixedly connected to the workbench. The guide piston rods are grouped in pairs and distributed on both sides of the lifting cylinder, one end of the guide piston rod is connected to the fixed frame, and the other end is connected to the workbench. The fixed frame is provided with a plurality of slots, and the detection head is installed in multiple groups and in an adjustable position on the slots. The layout position of the detection head in the lifting and detecting mechanism of the first detection station is different from the layout position of the detection head in the lifting and detecting mechanism of the second detection station.

[0014] The resulting technical effect is: the lifting and testing mechanism is located above the conveyor line, the lifting position of the fixed frame and the testing head is controlled by the lifting cylinder, the guide piston rod is used to stabilize the lifting and lowering of the fixed frame, thereby ensuring the close contact between the testing head and the injection holes and the balance holes on the battery to be tested, and the multiple slots arranged on the fixed frame are intended to correspond to the multiple rows of cells on the battery to be tested, the testing head can adjust its position in the slots to match the positions of different cells of the battery to be tested. It should be noted that the first testing station does not completely test the air tightness of all cells on the battery to be tested, but only a part of it. The air tightness test of the remaining cells is completed by the lifting and testing mechanism on the second testing station, thus avoiding the problem of misjudgment of air tightness detection caused by overall pressure.

[0015] Preferably, the detection head includes a connecting column, a liquid injection hole soft rubber pad, a ventilation sensing component, a support and a balance hole soft rubber pad, the connecting column is fixed in the slot of the fixing frame by a nut, the bottom of the connecting column is provided with an air channel, the middle part of the liquid injection hole soft rubber pad is provided with an air hole connected to the air channel, the liquid injection hole soft rubber pad is fixed to the bottom end of the connecting column and is used to seal the liquid injection hole of the battery to be tested, the ventilation sensing component is fixed on the connecting column and connected to the air channel, the ventilation sensing component is connected to the electrical signal of the display screen on the workbench, the support is fixed on one side of the connecting column, the balance hole soft rubber pad is fixed to the bottom end of the support, and the balance hole soft rubber pad is used to seal the balance hole of the battery to be tested.

[0016] The resulting technical effect is: the detection head is fixed in the slot of the fixing frame by means of connecting columns and nuts, and the installation position can be changed according to the detection needs. An air passage is provided at the bottom of the connecting column to provide an air path. During detection, the soft rubber pad of the injection hole seals the injection hole, and the soft rubber pad of the balance hole seals the balance hole, isolating the battery cell from the outside. It is only necessary to inject air and pressurize the battery cell through the ventilation sensing component, and the data results of the ventilation sensing component detection will be directly displayed.

[0017] Preferably, the ventilation sensing assembly includes a ventilation pipe and a pressure sensor, one end of the ventilation pipe is connected to the air passage, the other end of the ventilation pipe is connected to an external air supply source, and the pressure sensor is fixed inside the ventilation pipe and is used to detect the internal air pressure of a single cell.

[0018] The resulting technical effect is that the pressure sensor is used to detect the internal pressure state of a single cell. If the air tightness inside the single cell is defective, the detected value will change.

[0019] Preferably, the thickness of the soft rubber pad of the injection hole is 8mm~10mm, and the outer diameter of the soft rubber pad of the injection hole is 3mm~5mm larger than the hole diameter of the injection hole. The thickness of the soft rubber pad of the balancing hole is 6mm~8mm, and the outer diameter of the soft rubber pad of the balancing hole is 2mm~3mm larger than the inner diameter of the balancing hole.

[0020] The resulting technical effect is: the injection hole is sealed with a soft rubber pad, and the balance hole is sealed with a soft rubber pad, thereby establishing a closed environment for single-grid detection.

[0021] Preferably, the positioning and stopping mechanism includes a photoelectric sensor, a telescopic correcting rod and a telescopic stop limit rod, and the photoelectric sensor, telescopic correcting rod and telescopic stop limit rod are arranged at intervals on the other side of the conveying direction of the conveyor line corresponding to the conveying direction of the conveyor line. The photoelectric sensor, telescopic correcting rod and telescopic stop limit rod are all connected to a controller on the workbench by electrical signals, and the telescopic direction of the telescopic correcting rod and the telescopic stop limit rod are respectively perpendicular to the conveying direction of the conveyor line.

[0022] The resulting technical effect is: the photoelectric sensor can detect the position information of the battery to be tested, the extension of the telescopic positioning rod can make the battery to be tested close to the guide plate, thereby adjusting the position of the battery to be tested, and the extension of the telescopic stop limit rod blocks the battery to be tested from continuing to move forward, thereby locating the position of the battery to be tested on the conveyor line. In this position, the lifting detection mechanism can detect the air tightness of the battery to be tested.

[0023] The present invention also discloses a method for detecting the air tightness of a semi-finished battery cell, which uses the above-mentioned detection device and comprises the following steps:

[0024] Step 1: Position the first inspection station of the battery to be tested, convey the battery to be tested from the conveyor line to the first inspection station, and the photoelectric sensor in the positioning and stopping mechanism corresponding to the first inspection station detects the information of the battery to be tested, and the controller on the workbench controls the telescopic positioning rod to extend and adjust the position of the battery to be tested on the conveyor line so that it is close to the guide plate, and the telescopic stop rod is extended to prevent the battery to be tested from continuing to move;

[0025] Step 2: Air tightness test of some cells of the battery to be tested. The lifting and testing mechanism on the first testing station moves downward, so that the testing head descends to the battery to be tested and multiple testing heads are pressed against a part of the injection holes and balance holes on the battery to be tested. The air tightness state inside the corresponding cell is obtained through the ventilation sensing component on the testing head. If the pressure detected by the pressure sensor in the ventilation sensing component is less than the external air supply pressure, it is determined that the battery cell has an air tightness defect. Otherwise, it is good and the test data is recorded.

[0026] Step 3: Position the second inspection station of the battery to be tested. On the basis of step 2, the telescopic positive rod and the telescopic stop rod retreat, and the conveyor line continues to transport the battery to be tested to move downstream. When the photoelectric sensor in the positioning and stopping mechanism of the second inspection station detects the information of the battery to be tested, the controller controls the telescopic positive rod on the station to extend and adjust the position of the battery to be tested on the conveyor line. The extension of the telescopic stop rod limits the battery to be tested to be located directly below the lifting detection mechanism of the second inspection station.

[0027] Step 4: Air tightness test of the remaining cells of the battery to be tested. The lifting and testing mechanism on the second testing station moves downward, so that the testing head descends onto the battery to be tested and multiple testing heads are pressed against the remaining injection holes and balance holes on the battery to be tested. The air tightness status inside the corresponding cell is obtained through the ventilation sensing component on the testing head. If the pressure detected by the pressure sensor in the ventilation sensing component is lower than the external air supply pressure, it is determined that the battery cell has an air tightness defect. Otherwise, it is good. The test result is displayed on the display screen on the workbench.

[0028] The beneficial effect of the present invention is that the present invention completes the airtightness detection process of the battery to be tested in two parts. It can be understood that there is no need to squeeze the battery cover as a whole during partial detection. The detection head is both a squeezing point and a detection point. This avoids the problem of misjudgment of airtightness detection caused by squeezing the battery cover as a whole, thereby improving the accuracy of airtightness detection and improving the safety of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a structural diagram of a semi-finished battery cell air tightness detection device of the present invention;

[0030] Figure 2 It is a front view of a semi-finished battery cell air tightness detection device of the present invention;

[0031] Figure 3 A side view of a semi-finished battery cell air tightness detection device of the present invention;

[0032] Figure 4 A large-scale drawing of a detection head of a semi-finished battery cell air tightness detection device of the present invention;

[0033] Figure 5 This is a diagram of the installation of a detection head of a semi-finished battery cell air tightness detection device of the present invention.

[0034] 1 workbench, 2 conveyor line, 3 guide plate, 4 battery to be tested, 5 first inspection station, 6 second inspection station, 7 lifting inspection mechanism, 71 lifting cylinder, 72 fixing frame, 721 slot hole, 73 guide piston rod, 74 inspection head, 741 connecting column, 742 soft rubber pad for injection hole, 743 ventilation sensing component, 744 support, 745 soft rubber pad for balance hole, 8 positioning stopping mechanism, 81 photoelectric sensor, 82 telescopic positive rod, 83 telescopic limit stop rod, 9 start button, 10 emergency stop button, 11 display screen. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0036] See the attached Figures 1 to 5 According to an embodiment of the present invention, a semi-finished battery cell air tightness detection device comprises:

[0037] A workbench 1, on which a conveyor line 2 is horizontally arranged, a guide plate 3 is arranged in parallel on one side of the conveyor line 2, the conveyor line 2 is used to sequentially convey batteries 4 to be tested, and the workbench 1 is provided with a first inspection station 5 and a second inspection station 6 corresponding to the conveying direction of the conveyor line;

[0038] Lifting detection mechanism 7, there are two groups of lifting detection mechanism 7 and they are respectively installed on the workbench 1 corresponding to the first detection station 5 and the second detection station 6, each lifting detection mechanism 7 is provided with a plurality of detection heads 74, the detection heads 74 are crimped and sealed to the injection holes and the balance holes on the battery cover, the lifting detection mechanism 7 on the first detection station 5 is for air tightness detection of part of the cells of the battery 4 to be tested, and the lifting detection mechanism 7 on the second detection station 6 is for air tightness detection of the remaining cells of the battery 4 to be tested;

[0039] The positioning and stopping mechanism 8 is installed at the other side of the conveyor line 2 and is used to position the battery 4 to be tested at the first testing station and the second testing station.

[0040] The air tightness test of this product is different from the traditional test method. The present invention changes the overall extrusion test method into an intermediate extrusion test. It can be understood that when testing, the present invention does not extrude the battery cover as a whole, but extrude the single-cell injection holes and balance holes locally and point-to-point in the middle. This avoids the misjudgment of poor air tightness caused by overall extrusion as qualified air tightness, thereby improving the accuracy of air tightness test and improving the safety of the product. When the present invention is implemented, a preheating machine is set in front of the heat sealing machine to preheat the sealing position of the battery slot and the battery cover, and then the battery slot and the cover are crimped, and the air tightness test is carried out in two test stations. First, one part of the test process is completed, and then the remaining part of the test process is completed, thereby realizing the air tightness test of the battery cell.

[0041] In other embodiments, the conveyor line 2 is a roller conveyor line, and arc-shaped guide sections are provided at both ends of the guide plate 3 to facilitate pre-adjustment of the position of the battery to be tested. The workbench 1 is provided with a start button 9 and an emergency stop button 10 for controlling the lifting detection mechanism 7 and the working status of the conveyor line 2, which is convenient for the operator to control emergency control.

[0042] In other specific embodiments, the lifting and detecting mechanism 7 is located above the conveyor line 2, and the lifting and detecting mechanism 7 includes a lifting cylinder 71, a fixed frame 72, a guide piston rod 73 and a detection head 74. The fixed end of the lifting cylinder 71 is connected to the fixed frame 72, and the free end of the lifting cylinder 71 is fixedly connected to the workbench 1. The guide piston rods 73 are grouped in pairs and distributed on both sides of the lifting cylinder 71 to improve the stability of the lifting and lowering of the fixed frame. One end of the guide piston rod 73 is connected to the fixed frame 72, and the other end is connected to the workbench 1. Two slots 721 are provided on the fixed frame 72, and the two slots correspond to two rows of slots of the batteries to be tested. The detection head 74 is installed in multiple groups and can be adjusted in position on the slots 721. The layout position of the detection head in the lifting and detecting mechanism of the first detection station is different from the layout position of the detection head in the lifting and detecting mechanism of the second detection station.

[0043] In specific implementation, there are 6 cells on the battery to be tested. Then, during layout, the detection heads of the first detection station 5 are arranged in a front 2 and rear 1 layout, corresponding to the positions of the 2nd, 4th and 6th cell injection holes of the battery to be tested respectively, and the detection heads of the second detection station 6 are arranged in a front 1 and rear 2 layout, corresponding to the positions of the 1st, 3rd and 5th cell injection holes of the battery to be tested respectively.

[0044] In other specific embodiments, the detection head 74 includes a connecting column 741, a liquid injection hole soft rubber pad 742, a ventilation sensing component 743, a support 744 and a balance hole soft rubber pad 745. The connecting column 741 is fixed in the slot 721 of the fixing frame 72 by a nut and can be adjusted according to the position of the liquid injection hole of the detection cell. The bottom of the connecting column 741 is provided with an air channel, and the middle of the liquid injection hole soft rubber pad 742 is provided with an air hole connected to the air channel. The liquid injection hole soft rubber pad 742 is fixed to the bottom end of the connecting column 741 and is used to close the detection As for the filling hole of the battery 4, it can be understood that, in the close contact state, only the air passage inside the battery cell is connected to the outside through an air path, the ventilation sensing component 743 is fixed on the connecting column 741 and connected to the air passage, the ventilation sensing component 743 is connected to the electrical signal of the display screen 11 on the workbench 1, the support 744 is fixed on one side of the connecting column 741, the balance hole soft rubber pad 745 is fixed on the bottom end of the support 744, and the balance hole soft rubber pad 745 is used to seal the balance hole of the battery to be tested, to establish a closed environment, and to avoid air leakage.

[0045] In some other embodiments, the ventilation sensing component 743 includes a ventilation pipe and a pressure sensor, one end of the ventilation pipe is connected to the air passage, the other end of the ventilation pipe is connected to an external air supply source, and the pressure sensor is fixed inside the ventilation pipe and used to detect the air pressure inside the cell. It is understandable that the external air source can enter the cell to be tested from the ventilation sensing component, and the pressure sensor on the air path detects the pressure state, and the air tightness of the cell is known, and the detection result can be displayed on the display screen on the workbench.

[0046] In other specific embodiments, the thickness of the injection hole soft rubber pad 742 is 8mm~10mm, and the outer diameter of the injection hole soft rubber pad 742 is 3mm~5mm larger than the hole diameter of the injection hole to ensure the close contact effect. The thickness of the balancing hole soft rubber pad 745 is 6mm~8mm, and the outer diameter of the balancing hole soft rubber pad 745 is 2mm~3mm larger than the inner diameter of the balancing hole to achieve the sealing effect of the balancing hole.

[0047] In some other embodiments, the positioning and stopping mechanism 8 includes a photoelectric sensor 81, a telescopic positioning rod 82 and a telescopic stop limit rod 83. The photoelectric sensor 81, the telescopic positioning rod 82 and the telescopic stop limit rod 83 are arranged at intervals on the other side of the conveying direction of the conveyor line 2 corresponding to the conveying direction of the conveyor line 2. The photoelectric sensor 81, the telescopic positioning rod 82 and the telescopic stop limit rod 83 are all connected to the controller on the workbench by electrical signals. The telescopic direction of the telescopic positioning rod 82 and the telescopic stop limit rod 83 are respectively perpendicular to the conveying direction of the conveyor line 2.

[0048] In specific implementation, the telescopic correcting rod and the telescopic stop limit rod are both composed of electric telescopic rods. The end of the telescopic correcting rod abuts against the battery to be tested, making it close to the guide plate, and the extension of the telescopic stop limit rod blocks the end of the battery to be tested. The stop position corresponds exactly to the working position of the lifting detection mechanism.

[0049] The present invention also discloses a method for detecting the air tightness of a semi-finished battery cell, which uses the above-mentioned detection device and comprises the following steps:

[0050] Step 1: Position the first inspection station of the battery to be tested, and convey the battery to be tested 4 from the conveyor line 2 to the first inspection station 5. The photoelectric sensor 81 in the positioning and stopping mechanism corresponding to the first inspection station 5 detects the information of the battery to be tested, and the controller on the workbench controls the telescopic positioning rod to extend and adjust the position of the battery to be tested on the conveyor line so that it is close to the guide plate 3. The telescopic stop rod 83 is extended to block the further movement of the battery to be tested, and this position is directly below the lifting detection mechanism of the first inspection station;

[0051] Step 2: Air tightness test of some cells of the battery to be tested. The lifting and testing mechanism on the first testing station 5 moves downward, so that the testing head 74 descends to the battery to be tested 4 and multiple testing heads 74 press against some of the injection holes and balance holes (the second, fourth and sixth cell injection holes) on the battery to be tested. The air tightness state inside the corresponding cell is obtained through the ventilation sensing component on the testing head. If the pressure detected by the pressure sensor in the ventilation sensing component is less than the external air supply pressure, it is determined that the battery cell has an air tightness defect. Otherwise, it is good and the test data is recorded.

[0052] Step 3: Position the second inspection station of the battery to be tested. On the basis of step 2, the telescopic positioning rod 82 and the telescopic stop rod 83 retreat, and the conveyor line 2 continues to transport the battery to be tested 4 to move downstream. When the photoelectric sensor in the positioning and stopping mechanism of the second inspection station 6 detects the information of the battery to be tested, the controller controls the telescopic positioning rod 82 on the station to extend and adjust the position of the battery to be tested on the conveyor line, and the extension of the telescopic stop rod 83 limits the battery to be tested to be located directly below the lifting detection mechanism of the second inspection station;

[0053] Step 4: Air tightness test of the remaining cells of the battery to be tested. The lifting and testing mechanism on the second testing station moves downward, so that the testing head descends onto the battery to be tested and multiple testing heads are pressed against the remaining injection holes and balance holes (the 1st, 3rd and 5th cell injection holes) on the battery to be tested. The air tightness status inside the corresponding cell is obtained through the ventilation sensing component on the testing head. If the pressure detected by the pressure sensor in the ventilation sensing component is lower than the external air supply pressure, it is determined that the battery cell has an air tightness defect. Otherwise, it is good. The test result is displayed on the display screen on the workbench.

[0054] The present invention changes the original air tightness test using overall extrusion to intermediate extrusion, and divides the air tightness test into two testing stations to complete the air tightness test, thereby avoiding the occurrence of poor air tightness caused by overall extrusion being misjudged as qualified air tightness, thereby improving the accuracy of air tightness detection and improving product safety.

[0055] As for the device and the method of use disclosed in the embodiment, since they correspond to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0056] 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 rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A semi-finished battery cell air tightness detection device, characterized in that: include: A workbench (1), wherein a conveyor line (2) is horizontally arranged on the workbench (1), a guide plate (3) is arranged in parallel on one side of the conveyor line (2), the conveyor line (2) is used to sequentially convey batteries (4) to be tested, and the workbench (1) is provided with a first detection station (5) and a second detection station (6) corresponding to the conveying direction of the conveyor line; A lifting detection mechanism (7), wherein the lifting detection mechanism (7) has two groups and is respectively installed on the workbench (1) corresponding to the first detection station (5) and the second detection station (6), each of the lifting detection mechanisms (7) is provided with a plurality of detection heads (74), and the detection heads (74) are crimped to seal the injection holes and the balance holes on the battery cover, the lifting detection mechanism (7) on the first detection station (5) performs air tightness detection on part of the cells of the battery to be tested (4), and the lifting detection mechanism (7) on the second detection station (6) performs air tightness detection on the remaining cells of the battery to be tested (4); A positioning and stopping mechanism (8), the positioning and stopping mechanism (8) being installed on the other side of the conveying line (2), the positioning and stopping mechanism (8) being used to locate the position of the battery to be tested (4) at the first testing station and the second testing station.

2. A semi-finished battery cell air tightness detection device according to claim 1, characterized in that: The conveyor line (2) is a roller conveyor line, arc-shaped guide sections are provided at both ends of the guide plate (3), and a start button (9) and an emergency stop button (10) for controlling the lifting detection mechanism (7) and the working state of the conveyor line (2) are provided on the workbench (1).

3. The semi-finished battery cell air tightness detection device according to claim 1, characterized in that: The lifting detection mechanism (7) is located above the conveying line (2). The lifting detection mechanism (7) comprises a lifting cylinder (71), a fixing frame (72), a guide piston rod (73) and a detection head (74). The fixed end of the lifting cylinder (71) is connected to the fixing frame (72), and the free end of the lifting cylinder (71) is fixedly connected to the workbench (1). The guide piston rods (73) are arranged in groups of two and are distributed on both sides of the lifting cylinder (71). One end of the guide piston rod (73) is connected to the fixing frame (72), and the other end is connected to the workbench (1). The fixing frame (72) is provided with a plurality of slots (721). The detection head (74) is arranged in a plurality of groups and is adjustable in position on the slots (721). The layout position of the detection head in the lifting detection mechanism of the first detection station is different from the layout position of the detection head in the lifting detection mechanism of the second detection station.

4. A semi-finished battery cell air tightness detection device according to claim 3, characterized in that: The detection head (74) comprises a connecting column (741), a liquid injection hole soft rubber pad (742), a ventilation sensing component (743), a support (744) and a balance hole soft rubber pad (745); the connecting column (741) is fixed in a slot (721) of the fixing frame (72) by a nut; a gas passage channel is provided at the bottom of the connecting column (741); a gas passage hole connected to the gas passage channel is provided in the middle of the liquid injection hole soft rubber pad (742); the liquid injection hole soft rubber pad (742) is fixed to the connecting column (741) ) and is used to seal the injection hole of the battery to be tested (4), the ventilation sensing component (743) is fixed on the connecting column (741) and is connected to the air passage channel, the ventilation sensing component (743) is connected to the display screen (11) on the workbench (1) by electrical signals, the support (744) is fixed on one side of the connecting column (741), the balance hole soft rubber pad (745) is fixed at the bottom end of the support (744), and the balance hole soft rubber pad (745) is used to seal the balance hole of the battery to be tested.

5. The semi-finished battery cell air tightness detection device according to claim 4, characterized in that: The ventilation sensing component (743) includes a ventilation pipe and a pressure sensor, one end of the ventilation pipe is connected to the air passage, and the other end of the ventilation pipe is connected to an external air supply source. The pressure sensor is fixed inside the ventilation pipe and is used to detect the internal air pressure of a single cell.

6. The semi-finished battery cell air tightness detection device according to claim 4, characterized in that: The thickness of the injection hole soft rubber pad (742) is 8 mm to 10 mm, and the outer diameter of the injection hole soft rubber pad (742) is 3 mm to 5 mm larger than the hole diameter of the injection hole. The thickness of the balance hole soft rubber pad (745) is 6 mm to 8 mm, and the outer diameter of the balance hole soft rubber pad (745) is 2 mm to 3 mm larger than the inner diameter of the balance hole.

7. The semi-finished battery cell air tightness detection device according to claim 1, characterized in that: The positioning and stopping mechanism (8) comprises a photoelectric sensor (81), a telescopic correcting rod (82) and a telescopic stop rod (83); the photoelectric sensor (81), the telescopic correcting rod (82) and the telescopic stop rod (83) are arranged at intervals on the other side of the conveying line (2) corresponding to the conveying direction of the conveying line (2); the photoelectric sensor (81), the telescopic correcting rod (82) and the telescopic stop rod (83) are all connected to a controller on a workbench by electrical signals; the telescopic directions of the telescopic correcting rod (82) and the telescopic stop rod (83) are respectively perpendicular to the conveying direction of the conveying line (2).

8. A method for detecting the air tightness of a semi-finished battery cell, using the detection device according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Position the first inspection station of the battery to be tested, convey the battery to be tested from the conveyor line to the first inspection station, and the photoelectric sensor in the positioning and stopping mechanism corresponding to the first inspection station detects the information of the battery to be tested, and the controller on the workbench controls the telescopic positioning rod to extend and adjust the position of the battery to be tested on the conveyor line so that it is close to the guide plate, and the telescopic stop rod is extended to prevent the battery to be tested from continuing to move; Step 2: Air tightness test of some cells of the battery to be tested. The lifting and testing mechanism on the first testing station moves downward, so that the testing head descends to the battery to be tested and multiple testing heads are pressed against a part of the injection holes and balance holes on the battery to be tested. The air tightness state inside the corresponding cell is obtained through the ventilation sensing component on the testing head. If the pressure detected by the pressure sensor in the ventilation sensing component is less than the external air supply pressure, it is determined that the battery cell has an air tightness defect. Otherwise, it is good and the test data is recorded. Step 3: Position the second inspection station of the battery to be tested. On the basis of step 2, the telescopic positive rod and the telescopic stop rod retreat, and the conveyor line continues to transport the battery to be tested to move downstream. When the photoelectric sensor in the positioning and stopping mechanism of the second inspection station detects the information of the battery to be tested, the controller controls the telescopic positive rod on the station to extend and adjust the position of the battery to be tested on the conveyor line. The extension of the telescopic stop rod limits the battery to be tested to be located directly below the lifting detection mechanism of the second inspection station. Step 4: Air tightness test of the remaining cells of the battery to be tested. The lifting and testing mechanism on the second testing station moves downward, so that the testing head descends onto the battery to be tested and multiple testing heads are pressed against the remaining injection holes and balance holes on the battery to be tested. The air tightness status inside the corresponding cell is obtained through the ventilation sensing component on the testing head. If the pressure detected by the pressure sensor in the ventilation sensing component is lower than the external air supply pressure, it is determined that the battery cell has an air tightness defect. Otherwise, it is good. The test result is displayed on the display screen on the workbench.

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