Weld joint sealing performance detection system

Abstract

A weld joint sealing performance detection system comprises a feeding station, a detection station and a discharging station. The feeding station is used for feeding a metal shell to the detection station, and the discharging station is used for taking down the metal shell from the detection station. The detection station comprises a first detection module, a second detection module, an opening and closing device, a leakage detection gas detector and a leakage detection gas injection head, the first detection module is used for supporting the inner surface of the metal shell, the first detection module and the second detection module are combined through the opening and closing device, and the welding seam is located between the first detection module and the second detection module; the first detection module and the second detection module are arranged on the metal shell, so that a first sealing cavity is formed between the metal shell and the first detection module at the weld joint, a second sealing cavity is formed between the metal shell and the second detection module, and the leak detection gas injection head is communicated with one of the first sealing cavity and the second sealing cavity to inject leak detection gas; the leak detection gas detector is communicated with the first sealing chamber and the second sealing chamber so as to detect the leak detection gas.

Description

Technical Field

[0001] The utility model relates to the technical field of battery core sealing performance detection, in particular to a weld sealing performance detection system. Background Art

[0002] With the rapid development of new energy vehicles, people have increasingly higher requirements for the sealing and protection performance of power batteries. In some fields, the sealing performance of power batteries is required to meet the protection requirements of IP67 or even IP68.

[0003] In the prior art, the cells of a power battery are generally installed in a metal shell 90 , such as a shell made of aluminum. Figure 1 FIG. 9 is a schematic structural diagram of a metal shell 90. When manufacturing the metal shell 90, a metal plate is generally provided and bent to connect the end to the end, and finally the end to the end joint is welded to form a hollow shell.

[0004] In subsequent steps, the battery cell material may be filled into the shell, and both ends of the shell may be sealed to complete the production of the battery cell.

[0005] Existing testing technologies for the sealing performance of power batteries generally only test the sealing performance of the battery cells after they are formed. However, after the battery cells are formed, if the sealing performance of some products is found to be substandard, the disposal of these substandard products will be difficult and costly.

[0006] In order to reduce costs and improve the yield rate of battery cells, how to directly test the sealing performance of the weld 91 of the metal shell 90 at the semi-finished product stage has become an urgent problem to be solved. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a weld sealing performance detection system, which can better detect the sealing performance of the weld of the metal shell and has a high degree of automation.

[0008] The utility model provides a weld sealing performance detection system, including a loading station, a detection station and an unloading station; the loading station is used to load a metal shell onto the detection station, and the unloading station is used to remove the metal shell from the detection station; the detection station includes a first detection module, a second detection module, an opening and closing device, a leak detection gas detector and a leak detection gas injection head for leak detection gas injection, the first detection module is used to support the inner surface of the metal shell, the opening and closing device combines the first detection module with the second detection module, the weld is located between the first detection module and the second detection module, so that the metal shell forms a first sealed chamber between the weld and the first detection module, and forms a second sealed chamber between the metal shell and the second detection module, the leak detection gas injection head is connected to one of the first sealed chamber and the second sealed chamber to inject leak detection gas, and the leak detection gas detector is connected to the first sealed chamber and the second sealed chamber to detect the leak detection gas.

[0009] Furthermore, the weld sealing performance detection system also includes a buffer station and a conveyor line, and the conveyor line moves between the unloading station and the buffer station.

[0010] Furthermore, the detection station includes a first work station, a second work station, a third work station, a guide rail and a first driving device. The second work station is located between the first work station and the third work station. The first work station corresponds to the position of the loading station, and the third work station corresponds to the unloading station. The first detection module can be slidably arranged on the guide rail and is connected to the first driving device. The first driving device drives the first detection module to move between the first work station, the second work station and the third work station.

[0011] Furthermore, there are multiple detection stations, and the multiple detection stations are arranged at once along the direction of the loading station. From the direction close to the loading station to the direction far away from the loading station, the height of the first detection module gradually increases in different detection stations.

[0012] Furthermore, the first detection module includes a carrying block, a first substrate and a fixing block, wherein the fixing block is arranged on the first substrate, one end of the carrying block is connected to the fixing block, and the other end is suspended.

[0013] Furthermore, the leak detection gas injection head is arranged on the second detection module, and a device for connecting with the leak detection gas injection head is formed at one end of the fixed block facing the second detection module. When the first detection module is combined with the second detection module, the leak detection gas injection head is connected to the first sealed chamber through the first gas path.

[0014] Furthermore, a first annular sealing ring is provided on the surface of the carrier block facing the second detection module. When the metal shell is mounted on the carrier block, the upper surface of the carrier block, the first sealing ring and the metal shell together form the first sealed chamber.

[0015] Furthermore, the leak detection gas injection head is arranged on the second detection module so as to be movable up and down along its own axis, and abuts against the fixed block when moving downward.

[0016] Furthermore, the second detection module includes a second substrate, and a second annular sealing ring is provided on the side of the second substrate facing the first detection module. When the first detection module is combined with the second detection module, the second substrate and the metal shell jointly form the second sealed chamber.

[0017] Furthermore, a second opening is formed on a side surface of the second substrate facing the first detection module. The second opening is located in the second sealing ring, and a second air path located on the second substrate is connected to the second opening.

[0018] In summary, in the present invention, by providing a loading station, a testing station, and an unloading station, the system can achieve a high degree of automation. After placing the metal shell on the loading station of the system, the system can automatically detect the sealing performance of the metal shell's weld. Furthermore, by providing the first detection module and the second detection module, on the one hand, it can facilitate the fixation of the metal, and on the other hand, it can also facilitate the formation of sealed chambers on both sides of the weld, as well as the subsequent injection and detection of leak detection gas. Therefore, the weld sealing performance measurement system can effectively detect the sealing performance of the metal shell's weld, and has a high degree of automation.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In addition, in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic structural diagram of the metal shell.

[0021] Figure 2 Shown is a schematic diagram of the axial structure of the weld sealing performance detection system provided by an embodiment of the present utility model.

[0022] Figure 3 Shown Figure 2 Side view structural diagram of the center weld sealing performance detection system.

[0023] Figure 4 Shown Figure 2 Schematic diagram of the top view of the weld sealing performance detection system.

[0024] Figure 5 Shown Figure 2 Schematic diagram of the axial side structure of the central weld sealing performance detection system during sealing performance detection.

[0025] Figure 6 Shown Figure 2 Schematic diagram of the axial structure of the inspection station of the weld sealing performance inspection system.

[0026] Figure 7 Shown Figure 6 Schematic diagram of the side view of the inspection station in the unclosed state.

[0027] Figure 8 Shown Figure 6 Schematic diagram of the side view of the inspection station in the closed state.

[0028] Figure 9 Shown Figure 6 Schematic diagram of the axial structure of the first detection module.

[0029] Figure 10 Shown Figure 9 Schematic diagram of the top view of the first detection module.

[0030] Figure 11 Shown Figure 9 Schematic diagram of the axial structure after the first detection module is installed in the metal shell.

[0031] Figure 12 Shown Figure 11 Schematic diagram of the axial structure of the second detection module.

[0032] Figure 13 Shown Figure 11 Schematic diagram of the axial structure of the second detection module from another perspective.

[0033] Figure 14 Shown Figure 11 Schematic diagram of the upward structure of the second detection module.

[0034] Figure 15 Shown is a side view structural diagram of the first detection module and the second detection module after being combined.

[0035] Figure 16 Shown Figure 14 Schematic diagram of the cross-sectional structure along the XVI-XVI direction.

[0036] Figure 17 Shown Figure 12 Schematic diagram of the cross-sectional structure after the leak detection gas injection head is combined with the first detection module.

[0037] Figure 18 Shown Figure 16 Schematic diagram of the enlarged structure in the middle circle.

[0038] Figure 19 Shown is a schematic diagram of the axial structure of the leak detection gas injection head. DETAILED DESCRIPTION

[0039] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the utility model, the following is a detailed description with reference to the accompanying drawings and preferred embodiments.

[0040] The utility model provides a weld sealing performance detection system. The weld sealing performance measurement system can better detect the sealing performance of the weld of a metal shell and has a high degree of automation.

[0041] Please refer to Figures 2 to 5 、 Figures 16 to 18 As shown, the weld sealing performance detection system provided by the embodiment of the present invention includes a loading station 10 , a detection station 20 and an unloading station 30 .

[0042] The loading station 10 is used to load the metal shell 90 onto the inspection station 20. Specifically, the loading station 10 can be provided with a first manipulator 11, which can adsorb the metal shell 90 through a device such as a suction cup and then deliver it to the inspection station 20.

[0043] The inspection station 20 includes a first inspection module 21, a second inspection module 22, an opening and closing device 23, a leak detection gas detector (not shown), and a leak detection gas injection head 24 for injecting leak detection gas. The first inspection module 21 is used to support the inner surface of the metal shell 90. The opening and closing device 23 combines the first inspection module 21 with the second inspection module 22. The weld 91 is located between the first inspection module 21 and the second inspection module 22, so that the metal shell 90 forms a first sealed chamber 251 between the weld 91 and the first inspection module 21 (see FIG. 2 ). Figure 18), and a second sealed chamber 252 is formed between the weld seam 91 of the metal shell 90 and the second detection module 22. The leak detection gas injection head 24 is connected to one of the first sealed chamber 251 and the second sealed chamber 252 to inject leak detection gas, and the leak detection gas detector is connected to the other of the first sealed chamber 251 and the second sealed chamber 252 to detect the leak detection gas. It should be noted that in order to better illustrate the structure of the system, the pipelines for gas or liquid flow connecting the various components are omitted in the drawings.

[0044] The unloading station 30 is used to remove the inspected metal shell 90 from the inspection station 20. Specifically, the unloading station 30 can be provided with a second manipulator 31, which can adsorb the metal shell 90 through a device such as a suction cup and then remove it from the inspection station 20.

[0045] When using the weld sealing performance detection system provided in this embodiment to detect the sealing performance of the weld 91 of the metal shell 90, the product can be placed on the loading station 10 first, and the inner surface of the metal shell 90 can be supported on the first detection module 21 through the loading station 10; the opening and closing device 23 is opened to combine the first detection module 21 with the second detection module 22 to detect the sealing performance of the weld 91 of the metal shell 90.

[0046] During testing, a leak detection gas, such as helium, can be injected into one of the first sealed chamber 251 and the second sealed chamber 252 through the leak detection gas injection head 24. Finally, after a period of time, the leak detection gas detector detects whether the leak detection gas is present in the other of the first sealed chamber 251 and the second sealed chamber 252. Since the first sealed chamber 251 and the second sealed chamber 252 are located on either side of the weld 91, when the leak detection gas is injected into one side, if the sealing performance of the weld 91 is unsatisfactory, the leak detection gas can be detected in the sealed chamber on the other side of the weld 91, or the concentration of the leak detection gas in the sealed chamber on that side is greater than a set value. Therefore, the sealing performance of the weld 91 can be tested using the above-mentioned device.

[0047] After the inspection, the metal shell 90 can be removed from the first inspection module 21 by the unloading station 30 and sent to the next station.

[0048] In this embodiment, the provision of the loading station 10, the inspection station 20, and the unloading station 30 enables the system to have a high degree of automation. After the metal shell 90 is placed in the loading station 10 of the system, the system can automatically inspect the sealing performance of the weld 91 of the metal shell 90. Furthermore, the provision of the first inspection module 21 and the second inspection module 22 facilitates the fixing of the metal shell 90 on the one hand, and the formation of the sealed chambers on both sides of the weld 91 on the other hand, as well as the subsequent injection and detection of the leak detection gas. Therefore, the weld 91 sealing performance measurement system can effectively inspect the sealing performance of the weld 91 of the metal shell 90, and has a high degree of automation.

[0049] Furthermore, the system may also be provided with a buffer station 40, which is located between the loading station 10 and the unloading station 30 to buffer unqualified products.

[0050] More specifically, the system further includes a conveyor line 50 , which can move between the unloading station 30 and the buffering station 40 to respectively deliver qualified metal shells 90 and unqualified metal shells 90 to different locations.

[0051] Please continue to refer to Figures 3 to 6 , a first working station 261, a second working station 262 and a third working station 263 are formed on the inspection station 20. The first working station 261 and the third working station 263 are respectively arranged on both sides of the second working station 262. The first working station 261 corresponds to the position of the loading station 10, and the third working station 263 corresponds to the position of the unloading station 30. The inspection station 20 also includes a first driving device (not shown) and a guide rail 265. The guide rail 265 can be fixed to the inspection station 20. The first inspection module 21 is slidably arranged on the guide rail 265 and is connected to the first driving device. The first driving device drives the first inspection module 21 to move between the first working station 261, the second working station 262 and the third working station 263. The second inspection module 22 is arranged on the second working station 262. When the first inspection module 21 moves to the second working station 262, the second inspection module 22 is located above the first inspection module 21.

[0052] That is, when loading, the first driving device moves the first detection module 21 to the first working position 261, and the loading station 10 places the metal shell 90 on the first detection module 21; the first driving device drives the first detection module 21 to move to the second working position 262, the opening and closing device 23 combines the first detection module 21 with the second detection module 22, and starts to detect the sealing performance of the weld 91 on the metal shell 90; the first driving device drives the first detection module 21 to move to the third working position 263, and the unloading station 30 removes the metal shell 90 from the detection station 20.

[0053] Furthermore, in this embodiment, a plurality of inspection stations 20 can be set in the same weld sealing performance inspection system, and the plurality of inspection stations 20 are arranged along the feeding direction of the feeding station 10 (ie Figure 3 The first inspection modules 21 are arranged sequentially (in the left and right directions). The height of the first inspection modules 21 at different inspection stations 20 gradually increases, from closer to the loading station 10 to farther away from the loading station 10. This arrangement allows the loading station 10 to load materials for multiple inspection stations 20 without interfering with each other.

[0054] Please continue to see Figures 6 to 8 The opening and closing device 23, such as a telescopic cylinder, can be set on the second working position 262. When the first detection module 21 moves to the second working position 262, the opening and closing device 23 is started. The opening and closing device 23 lifts the first detection module 21 and combines it with the second detection module 22 to complete the closing of the first sealed chamber 251 and the second sealed chamber.

[0055] Please continue to refer to Figures 7 to 11 ,as well as Figures 15 and 16 In this embodiment, the first inspection module 21 includes a carrier block 211, a first substrate 212, and a fixed block 213. The fixed block 213 is disposed on the first substrate 212. One end of the carrier block 211 is connected to the fixed block 213, and the other end forms a free end. That is, one end of the carrier block 211 is connected to the fixed block 213, and the other end is suspended. When the loading station 10 places the metal housing 90 on the first inspection module 21, the metal housing 90 is mounted on the outside of the carrier block 211 from the suspended end.

[0056] Furthermore, a first connector 2131 for connecting to the leak detection gas injection head 24 is formed at one end of the fixed block 213 facing the second detection module 22. A first flow channel 2132 is formed on the fixed block 213 and communicates with the first connector 2131. A second flow channel 2111 is formed on the carrier block 211 and communicates with the second flow channel 2111 to form a first gas path, which communicates with the first sealed chamber 251. The leak detection gas injection head 24 is disposed on the second detection module 22. When the first detection module 21 and the second detection module 22 are combined, the leak detection gas injection head 24 communicates with the first gas path to inject leak detection gas into the first sealed chamber 251. In other words, the leak detection gas can enter the first sealed chamber 251 along the leak detection gas injection head 24, the first connector 2131, the first flow channel 2132, and the second flow channel 2111.

[0057] By placing the leak detection gas injection head 24 on the second detection module 22, and the opening and closing device 23 driving the first detection module 21 to move and combine with the second detection module 22, the first gas path between the leak detection gas injection head 24 and the first sealed chamber 251 can be connected after the two are combined. This can facilitate the layout of the flow channel and also prevent the measurement error of the leak detection gas concentration caused by the contact or movement of the equipment.

[0058] The cross-section of the carrier block 211, perpendicular to its length, conforms to the cross-section of the metal housing 90. An annular first sealing ring 271 is provided on the upper surface of the carrier block 211, i.e., on the side facing the second detection module 22. When the metal housing 90 is sleeved over the carrier block 211, the upper surface of the carrier block 211, the first sealing ring 271, and the metal housing 90 collectively form a first sealed chamber 251.

[0059] A first opening 2112 communicating with the first gas path is defined on a surface of the carrier block 211 facing the second detection module 22 . The first opening 2112 is located inside the first sealing ring 271 .

[0060] A plurality of supporting blocks 211 may be provided on the same first substrate 212 , so that the same inspection station 20 can inspect the sealing performance of the welds 91 on a plurality of metal shells 90 at the same time.

[0061] Positioning holes 2113 are formed in both the fixing block 213 and the bearing block 211. Connecting bolts (not shown) pass through the positioning holes 2113 in the fixing block 213 and the bearing block 211 to connect the fixing block 213 and the bearing block 211. This arrangement not only ensures the connection between the first flow channel 2132 and the second flow channel 2111, but also ensures a stable connection between the fixing block 213 and the bearing block 211, preventing the bearing block 211 from tilting.

[0062] Please continue to refer to Figures 12 to 16 The second detection module 22 includes a second substrate 221. An annular second sealing ring 272 is provided on the side of the second substrate 221 facing the first detection module 21. When the first detection module 21 and the second detection module 22 are combined, the second substrate 221, the metal housing 90, and the second sealing ring 272 together form a second sealed chamber 252.

[0063] A second opening 2211 is formed on a side surface of the second substrate 221 facing the first detection module 21. The second opening 2211 is located within the second sealing ring 272. A second gas path on the second substrate 221 communicates with the second opening 2211, allowing the leak detection gas detector to detect the leak detection gas within the second sealed chamber 252.

[0064] It can be understood that on the second substrate 221 , there are also multiple second sealing rings 272 , and the position of each second sealing ring 272 corresponds to the position of a first sealing ring 271 .

[0065] A control valve 222 is also provided on the second substrate 221. The second detection module 22 also includes a vacuum pumping device (not shown). The second gas path selectively connects to the vacuum pumping device and the leak detection gas detector via the control valve 222. When testing the sealing performance of the weld 91, the second sealed chamber 252 can be first evacuated using the vacuum pumping device, and then the leak detection gas within the second sealed chamber 252 can be tested to ensure the accuracy of the test results.

[0066] Please continue to refer to Figures 17 to 19 The leak detection gas injection head 24 is disposed on the second base plate 221 so as to be movable up and down along its own axis, and abuts against the fixed block 213 when moving downward.

[0067] More specifically, the leak detection gas injection head 24 can be fixed to the upper surface of the second base plate 221 via a support 241. The leak detection gas injection head 24 passes through the second base plate 221 and extends downward. A telescopic cylinder 242 is provided on the second base plate 221 to control the movement of the leak detection gas injection head 24.

[0068] A through hole 2212 is formed in the second substrate 221, and a third sealing ring 243 is mounted on the leak detection gas injection head 24. The leak detection gas injection head 24 extends into the through hole 2212, so that the third sealing ring 243 is sandwiched between the leak detection gas injection head 24 and the inner wall of the through hole 2212. This arrangement ensures that the leak detection gas injection head 24 can move up and down relative to the second substrate 221 while maintaining the sealing performance of the second sealed chamber 252.

[0069] Furthermore, the width of the bottom of the support 241 is greater than the width of the through hole 2212. A fourth sealing ring 244 is provided at the bottom of the support 241. The fourth sealing ring 244 is provided between the bottom of the support 241 and the top of the second substrate 221 to further increase the sealing performance.

[0070] In summary, in the present invention, by providing the loading station 10, the inspection station 20, and the unloading station 30, the system can have a high degree of automation. After the metal shell 90 is placed on the loading station 10 of the system, the system can automatically detect the sealing performance of the weld 91 of the metal shell 90. Furthermore, by providing the first inspection module 21 and the second inspection module 22, on the one hand, it can facilitate the fixation of the metal, and on the other hand, it can also facilitate the formation of the sealed chambers on both sides of the weld 91, as well as the subsequent injection of the leak detection gas and the detection of the leak detection gas. Therefore, the weld 91 sealing performance measurement system can better detect the sealing performance of the weld 91 of the metal shell 90, and has a high degree of automation.

[0071] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of the technical content disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A weld sealing performance detection system, characterized by: It includes a loading station, an inspection station and an unloading station; the loading station is used to load the metal shell onto the inspection station, and the unloading station is used to remove the metal shell from the inspection station; the inspection station includes a first inspection module, a second inspection module, an opening and closing device, a leak detection gas detector and a leak detection gas injection head for leak detection gas injection, the first inspection module is used to support the inner surface of the metal shell, the opening and closing device combines the first inspection module with the second inspection module, the weld is located between the first inspection module and the second inspection module, so that the metal shell forms a first sealed chamber between the weld and the first inspection module, and a second sealed chamber between the metal shell and the second inspection module, the leak detection gas injection head is connected to one of the first sealed chamber and the second sealed chamber to inject leak detection gas, and the leak detection gas detector is connected to the first sealed chamber and the second sealed chamber to detect the leak detection gas.

2. The weld sealing performance detection system according to claim 1, characterized in that: The weld sealing performance detection system further includes a buffer station and a conveyor line, and the conveyor line moves between the unloading station and the buffer station.

3. The weld sealing performance detection system according to claim 1, characterized in that: The detection station includes a first work station, a second work station, a third work station, a guide rail and a first driving device. The second work station is located between the first work station and the third work station. The first work station corresponds to the position of the loading station, and the third work station corresponds to the unloading station. The first detection module can be slidably set on the guide rail and is connected to the first driving device. The first driving device drives the first detection module to move between the first work station, the second work station and the third work station.

4. The weld sealing performance detection system according to claim 1, characterized in that: There are multiple detection stations, and the multiple detection stations are arranged at one time along the direction of the loading station. From the direction close to the loading station to the direction far away from the loading station, the height of the first detection module in different detection stations gradually increases.

5. The weld sealing performance detection system according to claim 1, characterized in that: The first detection module includes a carrying block, a first substrate and a fixing block. The fixing block is arranged on the first substrate. One end of the carrying block is connected to the fixing block, and the other end is suspended.

6. The weld sealing performance detection system according to claim 5, characterized in that: The leak detection gas injection head is arranged on the second detection module, and a leak detection gas injection head is formed at one end of the fixed block facing the second detection module. When the first detection module is combined with the second detection module, the leak detection gas injection head is connected to the first sealed chamber through the first gas path.

7. The weld sealing performance detection system according to claim 5, characterized in that: A first annular sealing ring is provided on the surface of the carrier block facing the second detection module. When the metal shell is mounted on the carrier block, the upper surface of the carrier block, the first sealing ring and the metal shell together form the first sealed chamber.

8. The weld sealing performance detection system according to claim 5, characterized in that: The leak detection gas injection head is arranged on the second detection module so as to be movable up and down along its own axis, and abuts against the fixed block when moving downward.

9. The weld sealing performance detection system according to claim 1, characterized in that: The second detection module includes a second substrate. A second annular sealing ring is provided on the side of the second substrate facing the first detection module. When the first detection module is combined with the second detection module, the second substrate and the metal shell together form the second sealed chamber.

10. The weld sealing performance detection system according to claim 9, characterized in that: A second opening is formed on a side surface of the second substrate facing the first detection module. The second opening is located in the second sealing ring. The second air path located on the second substrate is connected to the second opening.

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