Welding seam sealing performance detection device

Abstract

A welding seam sealing performance detection device comprises a first detection module, a second detection module, a driving device, a leak detection gas detector and a leak detection gas injection head used for injecting leak detection gas, the first detection module is provided with a bearing block used for bearing a shell, and the driving device drives the first detection module to be combined with the second detection module. The weld joint is located between the first detection module and the second detection module, so that a first sealing cavity and a second sealing cavity are formed in the two sides of the weld joint of the shell, a first air channel communicated with the first sealing cavity is formed in the bearing block, and a second air channel communicated with the second sealing cavity is formed in the second detection module; the leak detection gas injection head is arranged on the second detection module, the second gas channel is communicated with the leak detection gas detector, and when the first detection module is combined with the second detection module, the leak detection gas injection head is communicated with the first gas channel. The welding seam sealing performance detection device can well detect the sealing performance of the welding seam of the metal shell.

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 device. 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 battery cells of a power battery are generally installed in a metal casing, such as an aluminum casing. Figure 1 When manufacturing the metal shell 90 , a metal sheet is generally provided and bent to connect the end to the end, and finally the end to end connection is welded to form the hollow shell 90 .

[0004] In subsequent steps, the battery cell material may be filled into the shell 90 and both ends of the shell 90 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 device, which can better detect the sealing performance of the weld of the metal shell.

[0008] The utility model provides a weld sealing performance detection device, comprising a first detection module, a second detection module, a driving device, a leak detection gas detector and a leak detection gas injection head for leak detection gas injection, wherein a supporting block for supporting a shell is provided on the first detection module, the driving device drives the first detection module to be combined with the second detection module, the weld is located between the first detection module and the second detection module, so that the shell forms a first sealed chamber between the first detection module and the shell at the weld, and a second sealed chamber between the shell and the second detection module, a first air channel connected to the first sealed chamber is formed in the supporting block, a second air channel connected to the second sealed chamber is formed on the second detection module, the leak detection gas injection head is provided on the second detection module, the second air channel is connected to the leak detection gas detector, and when the first detection module is combined with the second detection module, the leak detection gas injection head is connected to the first air channel.

[0009] Furthermore, the first detection module includes a first substrate and a fixed block, the fixed block is arranged on the first substrate, one end of the supporting block is connected to the fixed block, and the other end forms a free end.

[0010] Furthermore, a first connector for connecting to the leak detection gas injection head is formed at one end of the fixed block facing the second detection module, a first flow channel is formed on the fixed block, the first flow channel is connected to the first connector, and a second flow channel is formed in the supporting block, the first flow channel is connected to the second flow channel to form a first gas channel.

[0011] Furthermore, a first annular sealing ring is provided on the surface of the supporting block facing the second detection module, and the opening of the first air duct is located inside the first sealing ring. When the shell is mounted outside the supporting block, the upper surface of the supporting block, the first sealing ring and the weld form a first sealed chamber.

[0012] Furthermore, positioning holes are formed on both the fixing block and the bearing block, and connecting bolts pass through the positioning holes on the fixing block and the bearing block to fix the bearing block on the fixing block.

[0013] Furthermore, the second detection module includes a second substrate, and a second annular sealing ring is formed on the side of the second substrate facing the first detection module. The opening of the second flow channel is located in the second sealing ring. When the first detection module is combined with the second detection module, the first substrate, the second sealing ring and the weld together form a second sealed chamber.

[0014] Furthermore, a control valve is provided on the second substrate, the second detection module further includes a vacuum pumping device, and the second flow channel can be selectively connected to the vacuum pumping device and the leak gas detector through the control valve.

[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.

[0016] Furthermore, the weld sealing performance detection device also includes a support plate, the driving device is fixed on the support plate, the driving device passes through the support plate through a telescopic rod and rests on the lower surface of the first substrate, and the second detection module is fixed on the support plate through a support column.

[0017] Furthermore, a slide rail is provided on the support plate, and the first substrate is movably provided on the support plate along the slide rail.

[0018] In summary, the provision of the support block facilitates the fixing of the shell on the one hand, and the formation of a sealed chamber on one side of the weld on the other. Furthermore, by placing the leak detection gas injection head on the second detection module, the drive device drives the first detection module to move and combine with the second detection module. This facilitates the layout of the flow channel and also prevents measurement errors in the leak detection gas concentration caused by contact problems with the equipment. Therefore, the weld sealing performance detection device provided by the utility model can effectively detect the sealing performance of the weld of the metal shell.

[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 side structure of the weld sealing performance detection device in an embodiment of the present utility model.

[0022] Figure 3 Shown Figure 2 Schematic diagram of the side structure of the center weld sealing performance detection device in the unclosed state.

[0023] Figure 4 Shown Figure 2 Schematic diagram of the side structure of the center weld sealing performance detection device in the closed state.

[0024] Figure 5 Shown Figure 2 Schematic diagram of the axial structure of the first detection module.

[0025] Figure 6 Shown Figure 5 Schematic diagram of the top view of the first detection module.

[0026] Figure 7 The figure shows a schematic diagram of the shaft side structure in which the metal shell is installed on the first detection module.

[0027] Figure 8 Shown Figure 2 Schematic diagram of the axial structure of the second detection module.

[0028] Figure 9 Shown Figure 8 Schematic diagram of the axial structure of the second detection module from another perspective.

[0029] Figure 10 Shown Figure 8 Schematic diagram of the upward structure of the second detection module.

[0030] Figure 11 Shown is a side view structural diagram of the first detection module and the second detection module after being combined.

[0031] Figure 12 Shown Figure 11 Schematic diagram of the cross-sectional structure along the XII-XII direction.

[0032] Figure 13 Shown Figure 12 Schematic diagram of the cross-sectional structure after the middle side leakage gas injection head is combined with the first detection module.

[0033] Figure 14 Shown Figure 12 Schematic diagram of the enlarged structure in the middle circle.

[0034] Figure 15 Shown is a schematic diagram of the axial structure of the leak detection gas injection head. DETAILED DESCRIPTION

[0035] 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.

[0036] The utility model provides a weld sealing performance detection device, which can better detect the sealing performance of the weld of a metal shell.

[0037] Please refer to Figures 2 to 4The weld sealing performance detection device provided by the embodiment of the present invention includes a first detection module 10, a second detection module 20, a driving device 30, a leak detection gas detector (not shown) and a leak detection gas injection head 40 for leak detection gas injection. A bearing block 11 for supporting a shell 90 is provided on the first detection module 10. The driving device 30 drives the first detection module 10 to combine with the second detection module 20, and the weld 91 is located between the first detection module 10 and the second detection module 20, so that the shell 90 forms a first sealed chamber 51 between the weld 91 and the first detection module 10 (see Figure 12 and Figure 13 ), and a second sealed chamber 52 is formed between the weld 91 of the shell 90 and the second detection module 20. A first air channel 12 communicating with the first sealed chamber 51 is formed in the carrier block 11, and a second air channel 22 communicating with the second sealed chamber 52 is formed on the second detection module 20. The second air channel 22 is connected to the leak detection gas detector. The leak detection gas injection head 40 is provided on the second detection module 20. When the first detection module 10 and the second detection module 20 are combined, the leak detection gas injection head 40 is connected to the first air channel 12 to inject the leak detection gas into the first sealed chamber 51.

[0038] When using the weld sealing performance detection device provided in this embodiment to detect the sealing performance of the weld 91 of the shell 90, the shell 90 can be first placed on the supporting block 11, and the first detection module 10 and the second detection module 20 can be driven to combine by the driving device 30; then the leak detection gas, such as helium, is filled into the first sealed chamber 51 through the second gas channel 22 through the leak detection gas injection head 40; finally, after a period of time, the leak detection gas detector detects whether there is leak detection gas in the second sealed chamber 52 through the second gas channel 22. Since the first sealed chamber 51 and the second sealed chamber 52 are respectively located on both sides of the weld 91, when the leak detection gas is injected on one side, if the sealing performance of the weld 91 is unqualified, 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 this side is greater than the set value. Therefore, the sealing performance of the weld 91 can be detected by the above-mentioned device.

[0039] In this embodiment, the provision of the support block 11 facilitates the securing of the housing 90 and the formation of a sealed chamber on one side of the weld 91. Furthermore, by placing the leak detection gas injection head 40 on the second detection module 20, the drive device 30 drives the first detection module 10 to move and combine with the second detection module 20. This facilitates the layout of the flow channel and also prevents measurement errors in the leak detection gas concentration caused by contact or movement of the equipment. Therefore, the weld sealing performance testing device provided by the present invention can effectively test the sealing performance of the weld 91 of the metal housing 90.

[0040] Please continue to refer to Figures 5 to 7 In this embodiment, the first detection module 10 further includes a first substrate 13 and a fixing block 14. The fixing block 14 is disposed on the first substrate 13. One end of the carrier block 11 is connected to the fixing block 14, and the other end forms a free end. That is, one end of the carrier block 11 is connected to the fixing block 14, and the other end is suspended, so that the housing 90 can be mounted outside the carrier block 11 from the suspended end of the carrier block 11.

[0041] Furthermore, a first connector 141 for connecting to the leak detection gas injection head 40 is formed on the end of the fixed block 14 facing the second detection module 20. A first flow channel 121 is formed on the fixed block 14 and communicates with the first connector 141. A second flow channel 122 is formed on the carrier block 11 and communicates with the first flow channel 121 to form the first gas channel 12. In other words, the leak detection gas can enter the first sealed chamber 51 along the leak detection gas injection head 40, the first connector 141, the first flow channel 121, and the second flow channel 122 in sequence.

[0042] The cross-section of the carrier block 11, perpendicular to its length, conforms to the cross-section of the housing 90. An annular first sealing ring 15 is provided on the upper surface of the carrier block 11. When the housing 90 is sleeved over the carrier block 11, the upper surface of the carrier block 11, the first sealing ring 15, and the weld 91 collectively form a first sealed chamber 51.

[0043] A first opening 111 communicating with the first air channel 12 is defined on a surface of the carrier block 11 facing the second detection module 20 . The first opening 111 is located inside the first sealing ring 15 .

[0044] A plurality of supporting blocks 11 may be provided on the first substrate 13 so as to detect the sealing performance of the welds 91 on a plurality of housings 90 at the same time.

[0045] Please refer to Figure 12 and Figure 13 Positioning holes 142 are formed in both the fixing block 14 and the bearing block 11. Connecting bolts (not shown) pass through the positioning holes 142 in the fixing block 14 and the bearing block 11 to connect the fixing block 14 and the bearing block 11. This arrangement not only ensures the connection between the first flow channel 121 and the second flow channel 122, but also ensures a stable connection between the fixing block 14 and the bearing block 11, preventing the bearing block 11 from tilting.

[0046] Please continue to refer to Figures 8 to 10The second detection module 20 includes a second substrate 23. An annular second sealing ring 24 is provided on the side of the second substrate 23 facing the first detection module 10. When the first detection module 10 and the second detection module 20 are combined, the second substrate 23, the weld 91, and the second sealing ring 24 together form a second sealed chamber 52.

[0047] A second opening 241 is formed on a side surface of the second substrate 23 facing the first detection module 10. The second opening 241 is located within the second sealing ring 24. The second air channel 22 located on the second substrate 23 communicates with the second opening 241, allowing the leak detection gas detector to detect the leak detection gas within the second sealed chamber 52.

[0048] It can be understood that on the second substrate 23 , there are also multiple second sealing rings 24 , and the position of each second sealing ring 24 corresponds to the position of a first sealing ring 15 .

[0049] A control valve 231 is also provided on the second substrate 23. The second detection module 20 also includes a vacuum pumping device. The second flow channel 122 selectively communicates with the vacuum pumping device and the leak detection gas detector via the control valve 231. When testing the sealing performance of the weld 91, the second sealed chamber 52 can be evacuated using the vacuum pumping device first, and then the leak detection gas within the second sealed chamber 52 can be tested to ensure the accuracy of the test results.

[0050] Please continue to refer to Figures 11 to 13 The leak detection gas injection head 40 is disposed on the second base plate 23 so as to be movable up and down along its own axis, and abuts against the fixed block 14 when moving downward.

[0051] More specifically, the leak detection gas injection head 40 can be fixed to the upper surface of the second base plate 23 by a support 41. The leak detection gas injection head 40 passes through the second base plate 23 and extends downward. A telescopic cylinder is provided on the second base plate 23 to control the movement of the leak detection gas injection head 40.

[0052] A through hole 232 is defined in the second substrate 23. A third sealing ring 42 is mounted on the leak detection gas injection head 40. The leak detection gas injection head 40 extends into the through hole 232, so that the third sealing ring 42 is sandwiched between the leak detection gas injection head 40 and the inner wall of the through hole 232. This arrangement ensures that the leak detection gas injection head 40 can move up and down relative to the second substrate 23 while maintaining the sealing performance of the second sealed chamber 52.

[0053] Furthermore, the width of the bottom of the support 41 is greater than the width of the through hole 232. A fourth sealing ring 43 is provided at the bottom of the support 41. The fourth sealing ring 43 is provided between the bottom of the support 41 and the top of the second substrate 23 to further increase the sealing performance.

[0054] Please continue to refer to Figures 2 to 4 The weld sealing performance testing device further includes a support plate 60. A drive device 30, such as a cylinder, is fixed to the support plate 60. The telescopic rod of the drive device 30 passes through the support plate 60 and abuts against the lower surface of the first base plate 13 to drive the movement of the first testing module 10. The second testing module 20 is fixed to the support plate 60 via a support column.

[0055] Furthermore, a slide rail 61 is provided on the support plate 60, and the first substrate 13 can be slidably provided on the support plate 60 along the slide rail 61. By providing the slide rail 61, the first substrate 13 is moved, so that the first detection module 10 can be moved out from under the second detection module 20, or moved to under the second detection module 20, thereby facilitating the removal of the housing 90.

[0056] It can be understood that the movement of the first detection module 10 on the support plate 60 can also be controlled by a cylinder.

[0057] In summary, the provision of the support block 11 facilitates the fixing of the housing 90 on the one hand, and also facilitates the formation of a sealed chamber on one side of the weld 91 on the other. Furthermore, by providing the leak detection gas injection head 40 on the second detection module 20, the drive device 30 drives the first detection module 10 to move and combine with the second detection module 20. This facilitates the layout of the flow channel and also prevents measurement errors in the leak detection gas concentration caused by contact problems with the equipment. Therefore, the weld sealing performance detection device provided by the utility model can effectively detect the sealing performance of the weld 91 of the metal housing 90.

[0058] 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 device, characterized by: It includes a first detection module, a second detection module, a driving device, a leak detection gas detector and a leak detection gas injection head for leak detection gas injection. The first detection module is provided with a supporting block for supporting the shell. The driving device drives the first detection module to be combined with the second detection module. The weld is located between the first detection module and the second detection module, so that the shell forms a first sealed chamber between the first detection module and the shell at the weld, and a second sealed chamber between the shell and the second detection module. A first air channel connected to the first sealed chamber is formed in the supporting block, and a second air channel connected to the second sealed chamber is formed on the second detection module. The leak detection gas injection head is provided on the second detection module, and the second air channel is connected to the leak detection gas detector. When the first detection module is combined with the second detection module, the leak detection gas injection head is connected to the first air channel.

2. The weld sealing performance detection device according to claim 1, characterized in that: The first detection module includes a first substrate and a fixing block. The fixing block is arranged on the first substrate. One end of the supporting block is connected to the fixing block, and the other end forms a free end.

3. The weld sealing performance detection device according to claim 2, characterized in that: A first connector for connecting to the leak detection gas injection head is formed at one end of the fixed block facing the second detection module, a first flow channel is formed on the fixed block, the first flow channel is connected to the first connector, and a second flow channel is formed in the supporting block, the first flow channel is connected to the second flow channel to form a first gas channel.

4. The weld sealing performance detection device according to claim 2, characterized in that: A first annular sealing ring is provided on the surface of the carrier block facing the second detection module, and the opening of the first air duct is located inside the first sealing ring. When the shell is mounted outside the carrier block, the upper surface of the carrier block, the first sealing ring and the weld form a first sealed chamber.

5. The weld sealing performance detection device according to claim 2, characterized in that: Positioning holes are formed on both the fixing block and the bearing block, and connecting bolts pass through the positioning holes on the fixing block and the bearing block to fix the bearing block on the fixing block.

6. The weld sealing performance detection device according to claim 1, characterized in that: The second detection module includes a second substrate, and an annular second sealing ring is formed on the side of the second substrate facing the first detection module. The opening of the second flow channel is located in the second sealing ring. When the first detection module is combined with the second detection module, the second substrate, the second sealing ring and the weld together form a second sealed chamber.

7. The weld sealing performance detection device according to claim 6, characterized in that: A control valve is further provided on the second substrate. The second detection module further includes a vacuum pumping device. The second flow channel can be selectively connected to the vacuum pumping device and the leak detection gas detector through the control valve.

8. The weld sealing performance detection device according to claim 1, 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.

9. The weld sealing performance detection device according to claim 2, characterized in that: The weld sealing performance detection device also includes a support plate, the driving device is fixed on the support plate, the driving device passes through the support plate through a telescopic rod and rests on the lower surface of the first substrate, and the second detection module is fixed on the support plate through a support column.

10. The weld sealing performance detection device according to claim 9, characterized in that: A slide rail is provided on the support plate, and the first substrate is movably provided on the support plate along the slide rail.

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