Dual-station airtightness detection device and method applied to power lithium battery top cover

Abstract

The present invention discloses a double-station airtightness detection device and method for a power lithium battery top cover, which is provided with a driving member, a connecting assembly, a transmission member, a control member and a sealing member. The control member is provided with a safety light curtain, a proportional valve group, a two-position five-way solenoid valve group and a direct-acting two-way solenoid valve group; the sealing member is provided with a lower cavity and an upper cavity; in front of the lower cavity, there are also a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor. The present invention automatically monitors the pressure values of each sealing area through the pressure sensors to detect the airtightness of the power lithium battery top cover, can automatically find out the leakage area of the power lithium battery top cover with poor airtightness, further improves the production process of the power lithium battery top cover, can automatically find out the leakage point of the power lithium battery top cover, has accurate judgment results and good traceability.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of industrial automation equipment, and particularly relates to a double-station airtightness detection device and detection method applied to the top cover of a power lithium battery. Background Art

[0002] In a power lithium battery, the airtightness of the power lithium battery top cover is crucial, directly affecting the quality of the entire power battery and the safety of an electric vehicle. The existing method is that workers place the power lithium battery top cover in the upper and lower cavities, the workers seal the upper and lower cavities and continuously pressurize the cavity inside the power lithium battery top cover, and judge whether the airtightness of the power lithium battery top cover meets the standard according to the pressure gauge set on the cavity. However, such a measurement method has a long measurement time, low efficiency, cannot be mass-produced, and has a large amount of manual operation, is prone to operation errors or confusion of test results, and it is also difficult to find the leakage point of the power lithium battery top cover. Summary of the Invention

[0003] Object of the Invention: In order to overcome the deficiencies existing in the prior art, the present invention provides a double-station airtightness detection device and detection method applied to the top cover of a power lithium battery.

[0004] Technical Solution: To achieve the above object, a double-station airtightness detection device applied to the top cover of a power lithium battery of the present invention is provided with a driving member, a connecting component, a transmission member, a control member and a sealing member. The control member is provided with a safety grating, a proportional valve group, a two-position five-way solenoid valve group, and a direct-acting two-way solenoid valve group; the sealing member is provided with a lower cavity and an upper cavity; a first pressure sensor, a second pressure sensor, a third pressure sensor, and a fourth pressure sensor are further provided in front of the lower cavity.

[0005] Further, the connecting component is provided with a device bottom plate, support columns, a lower pressure mounting plate, a lower cavity base, floating joints, fixing blocks, an upper cavity base, and limit blocks; the device bottom plate is arranged below the device, the support columns are arranged at the four corners above the device bottom plate; the lower pressure mounting plate is arranged above the four support columns; the safety grating is arranged between the front two support columns through a mounting sheet metal, and the lower cavity bases are respectively arranged on the left and right sides above the device bottom plate.

[0006] Further, the driving member is provided with a cylinder, and the transmission member is provided with a positioning pin, a spring, a positioning column, multiple groups of linear bearings, and guide columns. The linear bearings are respectively arranged around the cylinder and connected to the lower pressure mounting plate; the guide columns are arranged in the respective linear bearings and connected to the upper part of the upper cavity base; the floating joint is arranged at the end of the cylinder connecting rod and fixedly connected; the fixing block is assembled and connected with the floating joint and arranged above the upper cavity base; the cylinder drives the upper cavity base to move vertically in the Z-axis direction.

[0007] Further, the direct-acting two-way solenoid valve group is arranged behind the lower cavity base; the proportional valve group is arranged behind the direct-acting two-way solenoid valve group; the two-position five-way solenoid valve group is arranged behind the direct-acting two-way solenoid valve group.

[0008] Further, the lower cavity is arranged directly above the lower cavity base; the upper cavity is arranged directly below the upper cavity base and is connected to the positioning pins; the positioning pins are arranged on the left and right sides of the lower cavity to accurately press the power lithium battery top cover; the spring and the positioning column are arranged at the liquid injection hole of the power lithium battery top cover in the lower cavity; the limit block is arranged above the positioning column to limit the displacement of the positioning column in the Z-axis direction.

[0009] Further, the proportional valve group is provided with a first proportional valve and a second proportional valve; the direct-acting two-way solenoid valve group is provided with a first direct-acting two-way solenoid valve V1, a second direct-acting two-way solenoid valve V2, a third direct-acting two-way solenoid valve V3, a fourth direct-acting two-way solenoid valve V4, a fifth direct-acting two-way solenoid valve V5, a sixth direct-acting two-way solenoid valve V6, a seventh direct-acting two-way solenoid valve V7, and an eighth direct-acting two-way solenoid valve V8, which are arranged in a straight line along the X-axis.

[0010] A detection method for a double-station airtightness detection device applied to a power lithium battery top cover includes the following steps:

[0011] A. The power lithium battery top cover is placed in the lower cavity under the guiding action of the positioning column. The two-position five-way solenoid valve group changes the flow direction of the compressed air of the cylinder on the left station, and the cylinder drives the upper cavity to press down vertically. Through the guiding action of the positioning pins, the upper cavity accurately presses the outside of the power lithium battery top cover.

[0012] B. After the pressing is completed, by the sealing action of the inner seal ring of the power lithium battery, the power lithium battery top cover is divided into three regions, namely the left pole column region, the explosion-proof valve region, and the right pole column region; at the same time, due to the pressing force of the cylinder and the sealing action of the seal ring, the lower cavity isolates the inner side of the power lithium battery top cover from the external air pressure to form an inner sealed region.

[0013] C. The first direct-acting two-way solenoid valve V1, the second direct-acting two-way solenoid valve V2, the third direct-acting two-way solenoid valve V3, the fifth direct-acting two-way solenoid valve V5, the sixth direct-acting two-way solenoid valve V6, the seventh direct-acting two-way solenoid valve V7, and the eighth direct-acting two-way solenoid valve V8 are closed, and at the same time, the fourth direct-acting two-way solenoid valve V4 is opened. The compressed air passes through the second proportional valve to adjust the air pressure to three times the atmospheric pressure and enters the inner sealed region of the power lithium battery top cover.

[0014] D. After the fourth pressure sensor detects that the air pressure in this area is three times the atmospheric pressure, the second proportional valve is closed. If the pressure value converted from the signal collected by the fourth pressure sensor is still three times the atmospheric pressure, it indicates that the airtightness of the inner side of the power lithium battery top cover is good. Otherwise, if the first pressure sensor detects a pressure value, it indicates a leak in the left pole column; if the second pressure sensor detects a pressure value, it indicates a leak in the explosion-proof valve; if the third pressure sensor detects a pressure value, it indicates a leak in the right pole column.

[0015] E. The fifth two-way direct-acting solenoid valve V5, the sixth two-way direct-acting solenoid valve V6, the seventh two-way direct-acting solenoid valve V7, and the eighth two-way direct-acting solenoid valve V8 are opened, and each area is connected to the atmospheric pressure.

[0016] F. The first two-way direct-acting solenoid valve V1, the second two-way direct-acting solenoid valve V2, and the third two-way direct-acting solenoid valve V3 are opened, and the fourth two-way direct-acting solenoid valve V4, the fifth two-way direct-acting solenoid valve V5, the sixth two-way direct-acting solenoid valve V6, the seventh two-way direct-acting solenoid valve V7, and the eighth two-way direct-acting solenoid valve V8 are closed.

[0017] G. The compressed air passes through the first proportional valve to adjust the air pressure to three times the atmospheric pressure and enters the three sealed areas on the outer side of the power lithium battery top cover. After the first pressure sensor, the second pressure sensor, and the third pressure sensor detect that the air pressure in this area is three times the atmospheric pressure, the first proportional valve is closed. If the pressure value detected by the fourth pressure sensor is zero, it indicates that the airtightness of the outer side of the power lithium battery top cover is good. If the pressure value detected by the fourth pressure sensor is not zero, there is a leak in the outer side of the power lithium battery top cover.

[0018] H. The cylinder drives the upper cavity to rise vertically, and the device starts to detect the other working station, and operates in such a cycle.

[0019] Furthermore, the first pressure sensor is connected to the left pole column area; the second pressure sensor is connected to the explosion-proof valve area; the third pressure sensor is connected to the right pole column area; the fourth pressure sensor is connected to the inner sealed area.

[0020] The beneficial effects of the present invention are:

[0021] 1. By automatically monitoring the pressure values of each sealed area through pressure sensors to detect the airtightness of the power lithium battery top cover, it can automatically find the leakage area of the power lithium battery top cover with poor airtightness, further improve the production process of the power lithium battery top cover, can automatically find the leakage point of the power lithium battery top cover, the judgment result is accurate, and the traceability is good.

[0022] 2. By using the method of the cylinder pressing down instead of manual pressing down, introducing three times the atmospheric pressure into the inner side of the power lithium battery top cover and maintaining the air pressure value, and through the coordinated operation of each pressure sensor, two-way direct-acting solenoid valve group, proportional valve group, and five-way two-position solenoid valve group, it realizes the highly automated airtightness detection of the power lithium battery top cover, can save the measurement time, reduce the manual workload, and effectively improve the efficiency. Description of the Drawings

[0023] Appendix Figure 1 One of the overall structural schematic diagrams of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 1;

[0024] Appendix Figure 2 Two of the overall structural schematic diagrams of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 1;

[0025] Appendix Figure 3 One of the partial structural schematic diagrams of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 3;

[0026] Appendix Figure 4 Two of the partial structural schematic diagrams of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 4;

[0027] Appendix Figure 5 Three of the partial structural schematic diagrams of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 5;

[0028] Appendix Figure 6 For Figure 5 The schematic diagram of the B - B sectional structure in

[0029] Appendix Figure 7 For Figure 6 The enlarged structural schematic diagram of part C in

[0030] Appendix Figure 8 The schematic diagram of the lower cavity and upper cavity of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 2;

[0031] Appendix Figure 9 For Figure 8 The schematic diagram of the A - A sectional structure in

[0032] Appendix Figure 10 The partial structural schematic diagram of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 3;

[0033] Appendix Figure 11 The sectional structural schematic diagram of the elastic pressure expansion sealing rubber ring of a double - station airtightness detection device applied to the top cover of a power lithium battery in Embodiment 3. Detailed Description of the Invention

[0034] The present invention will be further described below with reference to the accompanying drawings.

[0035] Embodiment 1, as shown in Figures 1 to 7Shown is a double-station airtightness detection device applied to the top cover of a power lithium battery, which is provided with a driving member 100, a connecting component 101, a transmission member 102, a control member 103 and a sealing member 104; the driving member 100 is provided with a cylinder 6;

[0036] The connecting component 101 is provided with a device bottom plate 1, a support column 2, a downward pressing mounting plate 3, a lower cavity base 5, a floating joint 9, a fixing block 10, an upper cavity base 11, and a limiting block 18;

[0037] The transmission member 102 is provided with a linear bearing 7, a guide post 8, a positioning pin 17, a spring 19, and a positioning column 20;

[0038] The control member 103 is provided with a safety grating 4, a proportional valve group 12, a two-position five-way solenoid valve group 13, and a direct-acting two-way solenoid valve group 14; the sealing member 104 is provided with a lower cavity 15, an upper cavity 16, and a first pressure sensor 151, a second pressure sensor 152, a third pressure sensor 153, and a fourth pressure sensor 154 are still provided in front of the lower cavity 15;

[0039] The proportional valve group 12 is provided with a first proportional valve 121 and a second proportional valve 122; the direct-acting two-way solenoid valve group 14 is provided with a first direct-acting two-way solenoid valve 141, a second direct-acting two-way solenoid valve 142, a third direct-acting two-way solenoid valve 143, a fourth direct-acting two-way solenoid valve 144, a fifth direct-acting two-way solenoid valve 145, a sixth direct-acting two-way solenoid valve 146, a seventh direct-acting two-way solenoid valve 147, and an eighth direct-acting two-way solenoid valve 148

[0040] The device base plate 1 is arranged below the device and connected by bolts; four support columns 2 are arranged at the four corners above the device base plate 1 and connected by bolts; the downward pressure mounting plate 3 is arranged above the four support columns 2 and connected by bolts; two pairs of safety light curtains 4 are arranged between the front two support columns 2 through mounting sheet metal and connected by bolts to prevent the situation of accidentally injuring workers during the downward pressure process of the device; two lower cavity bases 5 are respectively arranged on the left and right sides above the device base plate 1 and connected by bolts; two cylinders 6 are arranged directly above the two lower cavity bases 5 and connected to the downward pressure mounting plate 3 through mounting aluminum plates; eight linear bearings 7 are respectively arranged around the two cylinders 6 and connected to the downward pressure mounting plate 3 by bolts; eight guide posts 8 are arranged inside each linear bearing 7 and connected to the upper part above the upper cavity base 11 by bolts; the floating joint 9 is arranged at the end of the connecting rod of the cylinder 6 and connected by threads; the fixed block 10 is assembled with the floating joint 9 and arranged above the upper cavity base 11 and connected to the upper cavity base 11 by bolts; through the transmission mode of the guide posts and linear bearings, the cylinder 6 drives the upper cavity base 11 to move in the Z-axis direction; two proportional valves 12 are arranged behind the lower cavity base 5 through mounting sheet metal and connected by bolts; the five-port two-position solenoid valve group 13 is arranged behind the lower cavity base 5 and connected by bolts; eight direct-acting two-port solenoid valves in the direct-acting two-port solenoid valve group 14 are arranged along the X-axis, arranged behind the lower cavity base 5 and connected by bolts; the lower cavity body 15 is arranged directly above the lower cavity base 5 and connected to the positioning pin by bolts; the upper cavity body 16 is arranged directly below the upper cavity base 11 and connected to the positioning pin 17 by bolts; the positioning pins 17 are arranged on the left and right sides of the lower cavity body 15 to accurately press the top cover of the power lithium battery by the lower cavity body 15; the springs 19 and positioning columns 20 are arranged at the liquid injection holes of the top cover of the power lithium battery inside the lower cavity body 15 to prevent misplacement and guide during the process of clamping the top cover of the power lithium battery; the limit blocks 18 are arranged above the positioning columns 20 and connected to the lower cavity body 15 by bolts to limit the displacement of the positioning columns 20 in the Z-axis direction.

[0041] Preferably, the cylinder 6 is a thin cylinder ACQ63x80S;

[0042] Preferably, the proportional valve group 12 is a proportional valve ITV1050-111BN;

[0043] Preferably, the five-port two-position solenoid valve group 13 is a solenoid valve SY3120-1G-M5;

[0044] Preferably, the direct-acting two-port solenoid valve group 14 is a solenoid valve VDW10AA;

[0045] The detection method of this device is as follows:

[0046] A. The top cover of the power lithium battery is placed in the lower cavity 15 under the guiding action of the positioning post 20. The five-way two-position solenoid valve group 13 changes the flow direction of the compressed air of the cylinder 6 on the left station, and the cylinder 6 drives the upper cavity 16 to vertically press down. Under the guiding action of the positioning pin 17, the upper cavity 16 accurately presses the outside of the top cover of the power lithium battery.

[0047] B. After the pressing is completed, due to the sealing effect of the inner seal ring of the power lithium battery, the top cover of the power lithium battery is divided into three regions, namely the left pole column region 161, the explosion-proof valve region 162, and the right pole column region 163. At the same time, due to the pressing force of the cylinder 6 and the sealing effect of the seal ring, the lower cavity 15 isolates the inner side of the top cover of the power lithium battery from the external air pressure to form an inner sealing region 155.

[0048] C. The first direct-acting two-way solenoid valve 141, the second direct-acting two-way solenoid valve 142, the third direct-acting two-way solenoid valve 143, the fifth direct-acting two-way solenoid valve 145, the sixth direct-acting two-way solenoid valve 146, the seventh direct-acting two-way solenoid valve 147, and the eighth direct-acting two-way solenoid valve 148 are closed. At the same time, the fourth direct-acting two-way solenoid valve 144 is opened, and the compressed air passes through the second proportional valve 122 to adjust the air pressure to three times the atmospheric pressure and enters the inner sealing region 155 of the top cover of the power lithium battery.

[0049] D. After the fourth pressure sensor 154 detects that the air pressure in this region is three times the atmospheric pressure, the second proportional valve 122 is closed. If the pressure value converted from the signal collected by the fourth pressure sensor 154 is still three times the atmospheric pressure, it indicates that the inner airtightness of the top cover of the power lithium battery is good. On the contrary, if the first pressure sensor 151 detects a pressure value, it indicates a leak in the left pole column; if the second pressure sensor 152 detects a pressure value, it indicates a leak in the explosion-proof valve; if the third pressure sensor 153 detects a pressure value, it indicates a leak in the right pole column.

[0050] E. The fifth direct-acting two-way solenoid valve 145, the sixth direct-acting two-way solenoid valve 146, the seventh direct-acting two-way solenoid valve 147, and the eighth direct-acting two-way solenoid valve 148 are opened, and each region is connected to the atmospheric pressure.

[0051] F. The first direct-acting two-way solenoid valve 141, the second direct-acting two-way solenoid valve 142, and the third direct-acting two-way solenoid valve 143 are opened, and the fourth direct-acting two-way solenoid valve 144, the fifth direct-acting two-way solenoid valve 145, the sixth direct-acting two-way solenoid valve 146, the seventh direct-acting two-way solenoid valve 147, and the eighth direct-acting two-way solenoid valve 148 are closed.

[0052] G. The compressed air passes through the first proportional valve 121 to adjust the air pressure to three times the atmospheric pressure and enters the three sealed areas outside the top cover of the power lithium battery. After the first pressure sensor 151, the second pressure sensor 152, and the third pressure sensor 153 collect that the air pressure in this area is three times the atmospheric pressure, the first proportional valve 121 is closed. If the pressure value detected by the fourth pressure sensor 154 is zero, the airtightness outside the top cover of the power lithium battery is good. If the pressure value detected by the fourth pressure sensor 154 is not zero, there is air leakage outside the top cover of the power lithium battery.

[0053] H. The air cylinder 6 drives the upper cavity 16 to rise vertically, and the device starts to detect the other working station, and operates in such a cycle.

[0054] Example 2, see Figures 8 - 9 , this example is basically the same as Example 1, the difference is that at the upper end of the positioning pin 17 of the lower cavity 15,

[0055] The upper cavity 16 is provided with an embedding groove 161 matching the positioning pin 17, and an electromagnet 162 is arranged in the embedding groove 161. When the positioning pin 17 is embedded into the upper cavity 16, the electromagnet 162 is turned on, and the positioning pin and the lower cavity 15 fixedly connected to the positioning pin are sucked upward, so that the gap between the upper cavity 16 and the lower cavity 15 is closed, enhancing the sealing performance and ensuring the accuracy of the airtightness detection of the lithium battery top cover.

[0056] Example 3, see Figures 10 - 11 , this example is basically the same as Example 1, the difference is that the upper cavity 16 and the lower cavity 15 are located outside the detection placement groove of the lithium battery top cover, and are provided with an elastic pressure expansion sealing rubber ring 153 and a sealing rubber ring groove 154. The elastic pressure expansion sealing rubber ring 153 is placed in the sealing rubber ring groove 154, and a middle air channel 155 is arranged in the elastic pressure expansion sealing rubber ring 153, and the elastic pressure expansion sealing rubber ring is connected to an air compressor;

[0057] When the upper cavity and the lower cavity are pressed together, the air compressor presses air into the elastic pressure expansion sealing rubber ring, so that the elastic pressure expansion sealing rubber ring expands, and the elastic pressure expansion sealing rubber ring fits completely with the upper cavity and the lower cavity, preventing the problem of poor sealing between the upper cavity and the lower cavity due to machining accuracy, and increasing the detection accuracy of the detection equipment itself.

[0058] The above are only the preferred embodiments of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A double-station airtightness detection device applied to the top cover of a power lithium battery, characterized in that: it is provided with a driving member (100), a connecting assembly (101), a transmission member (102), a control member (103) and a sealing member (104). The control member (103) is provided with a safety light curtain (4), a proportional valve group (12), a two-position five-way solenoid valve group (13), and a direct-acting two-way solenoid valve group (14); the sealing member (104) is provided with a lower cavity (15) and an upper cavity (16); in front of the lower cavity (15), there are also a first pressure sensor (151), a second pressure sensor (152), a third pressure sensor (153), and a fourth pressure sensor (154); The detection method of the double-station airtightness detection device for the top cover of a power lithium battery includes the following steps: A. The top cover of the power lithium battery is placed in the lower cavity (15) under the guiding action of the positioning post (20). The two-position five-way solenoid valve group (13) changes the flow direction of the compressed air of the cylinder (6) on the left station. The cylinder (6) drives the upper cavity (16) to press down vertically. Through the guiding action of the positioning pin (17), the upper cavity (16) accurately presses the outside of the top cover of the power lithium battery; B. After the pressing is completed, using the sealing effect of the inner sealing ring of the power lithium battery, the top cover of the power lithium battery is divided into three regions, namely the left pole column region (161), the explosion-proof valve region (162), and the right pole column region (163); at the same time, due to the pressing force of the cylinder (6) and the sealing effect of the sealing ring, the lower cavity (15) isolates the inner side of the top cover of the power lithium battery from the external air pressure to form an inner sealing region (155); C. The first direct-acting two-way solenoid valve (141), the second direct-acting two-way solenoid valve (142), the third direct-acting two-way solenoid valve (143), the fifth direct-acting two-way solenoid valve (145), the sixth direct-acting two-way solenoid valve (146), the seventh direct-acting two-way solenoid valve (147), and the eighth direct-acting two-way solenoid valve (148) of the direct-acting two-way solenoid valve group (14) are closed. At the same time, the fourth direct-acting two-way solenoid valve (144) is opened. The compressed air passes through the second proportional valve (122) to adjust the air pressure to three times the atmospheric pressure and enters the inner sealing region (155) of the top cover of the power lithium battery; D. After the fourth pressure sensor (154) collects that the air pressure in the inner sealing region (155) is three times the atmospheric pressure, the second proportional valve (122) is closed. If the pressure value converted by the signal collected by the fourth pressure sensor (154) is still three times the atmospheric pressure, the inner airtightness of the top cover of the power lithium battery is good. On the contrary, if the first pressure sensor (151) detects a pressure value, it indicates a leak in the left pole column. If the second pressure sensor (152) detects a pressure value, it indicates a leak in the explosion-proof valve. If the third pressure sensor (153) detects a pressure value, it indicates a leak in the right pole column; E. The fifth direct-acting two-way solenoid valve (145), the sixth direct-acting two-way solenoid valve (146), the seventh direct-acting two-way solenoid valve (147), and the eighth direct-acting two-way solenoid valve (148) are opened, and each region is connected to the atmospheric pressure; F. The first direct-acting two-way solenoid valve (141), the second direct-acting two-way solenoid valve (142), and the third direct-acting two-way solenoid valve (143) are opened, and the fourth direct-acting two-way solenoid valve (144), the fifth direct-acting two-way solenoid valve (145), the sixth direct-acting two-way solenoid valve (146), the seventh direct-acting two-way solenoid valve (147), and the eighth direct-acting two-way solenoid valve (148) are closed; G. The compressed air passes through the first proportional valve (121) to adjust the air pressure to three times the atmospheric pressure and enters the three sealed areas outside the top cover of the power lithium battery. After the first pressure sensor (151), the second pressure sensor (152), and the third pressure sensor (153) collect the air pressure in the three sealed areas outside to be three times the atmospheric pressure, the first proportional valve (121) is closed. If the pressure value detected by the fourth pressure sensor (154) is zero, the airtightness outside the top cover of the power lithium battery is good. If the pressure value detected by the fourth pressure sensor (154) is not zero, there is air leakage outside the top cover of the power lithium battery; H. The cylinder (6) drives the upper cavity (16) to rise vertically, and the device starts to detect the other working station, and operates in such a cycle; The first pressure sensor (151) is connected to the left pole column area (161); the second pressure sensor (152) is connected to the explosion-proof valve area (162); the third pressure sensor (153) is connected to the right pole column area (163); the fourth pressure sensor (154) is connected to the inner sealed area (155).

2. The double-station airtightness detection device for the top cover of a power lithium battery according to claim 1, characterized in that: The connection assembly (101) is provided with a device bottom plate (1), support columns (2), a downward pressure mounting plate (3), a lower cavity base (5), a floating joint (9), a fixed block (10), an upper cavity base (11), and a limit block (18); the device bottom plate (1) is arranged below the device, and the support columns (2) are arranged at the four corners above the device bottom plate (1); the downward pressure mounting plate (3) is arranged above the four support columns (2); the safety grating (4) is arranged between the two front support columns (2) through a mounting sheet metal, and the lower cavity base (5) is respectively arranged on the left and right sides above the device bottom plate (1).

3. The double-station airtightness detection device for the top cover of a power lithium battery according to claim 2, characterized in that: The driving member (100) is provided with a cylinder (6), and the transmission member (102) is provided with a positioning pin (17), a spring (19), a positioning column (20), multiple groups of linear bearings (7), and guide columns (8). The linear bearings (7) are respectively arranged around the cylinder (6) and are connected to the downward pressure mounting plate (3); the guide columns (8) are arranged in the respective linear bearings (7) and are connected to the upper part of the upper cavity base (11); the floating joint (9) is arranged at the end of the connecting rod of the cylinder (6) and is fixedly connected; the fixed block (10) is assembled and connected with the floating joint (9) and is arranged above the upper cavity base (11); the cylinder (6) drives the upper cavity base (11) to move vertically in the Z-axis direction.

4. A double-station airtightness detection device for the top cover of a power lithium battery according to claim 3, characterized in that: The direct-acting two-way solenoid valve group (14) is arranged behind the lower cavity base (5); the proportional valve group (12) is arranged behind the direct-acting two-way solenoid valve group (14); the two-position five-way solenoid valve group (13) is arranged behind the direct-acting two-way solenoid valve group (14).

5. A double-station airtightness detection device for the top cover of a power lithium battery according to claim 4, characterized in that: The lower cavity (15) is arranged directly above the lower cavity base (5); the upper cavity (16) is arranged directly below the upper cavity base (11) and is connected to the positioning pin (17); the positioning pins (17) are arranged on the left and right sides of the lower cavity (15) to accurately press the lower cavity (15) against the top cover of the power lithium battery; the spring (19) and the positioning column (20) are arranged at the liquid injection hole of the top cover of the power lithium battery in the lower cavity (15); the limit block (18) is arranged above the positioning column (20) to limit the displacement of the positioning column (20) in the Z-axis direction.

6. A double-station airtightness detection device for the top cover of a power lithium battery according to claim 1, characterized in that: The proportional valve group (12) is provided with a first proportional valve (121) and a second proportional valve (122); the direct-acting two-way solenoid valve group (14) is provided with a first direct-acting two-way solenoid valve (141), a second direct-acting two-way solenoid valve (142), a third direct-acting two-way solenoid valve (143), a fourth direct-acting two-way solenoid valve (144), a fifth direct-acting two-way solenoid valve (145), a sixth direct-acting two-way solenoid valve (146), a seventh direct-acting two-way solenoid valve (147), and an eighth direct-acting two-way solenoid valve (148), and they are arranged in a straight line along the X-axis.

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