Air tightness detection device

Abstract

The utility model provides an air tightness detection device, relates to the technical field of lithium batteries, and particularly relates to the air tightness detection device comprising an upper cavity and a lower cavity. In detail, a worker places a welding piece into a positioning hole formed in the lower cavity and then installs the upper cavity on the lower cavity. When air tightness detection is carried out, the inflation hole of the lower cavity is connected with an air source, it is guaranteed that the lower cavity is pressurized by the air source, and then liquid is injected into the water injection hole of the upper cavity. On the basis, a worker observes whether bubbles are generated on the surface of the welding part through the water injection hole, if no bubbles exist, the welding part passes through in an airtight mode, and otherwise, the welding part does not pass through. Therefore, the air tightness detection device provided by the utility model is simple to operate and short in time consumption, and is beneficial to improving the detection efficiency of the welding piece. Moreover, the worker can find the air leakage part of the welding part by observing the water injection hole, so that the improvement direction of the welding part can be conveniently checked, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to an airtightness detection device. Background Art

[0002] Large cylinders have become the mainstream products in the new energy market. In its production process, the assembly process is mainly laser welding, and the welding of the positive and negative collector plates and the shell mostly adopts the process of penetration welding. Generally, the first piece inspection is required before the mass production of negative penetration welding parts, and the inspection content includes air tightness and welding penetration and width.

[0003] However, when inspecting the first piece of negative electrode penetration welding, it is necessary to seal the welding shell, seal the sealing nails with glue, drill holes in the shell to insert the hose, and seal and fix the hose with glue, which leads to long waiting time for the production line and reduces production efficiency. Utility Model Content

[0004] The utility model aims to provide an airtightness detection device, which can simplify the airtightness detection steps, save the first piece detection time of the welded parts, and improve the production efficiency.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In the first aspect, the utility model provides an airtightness detection device, including an upper cavity and a lower cavity, the upper cavity is penetrated by a water injection hole, the lower cavity is detachably connected to the upper cavity, the lower cavity is a cavity structure, and the lower cavity is provided with a positioning hole and an inflation hole, the positioning hole and the water injection hole are coaxially arranged, and the positioning hole is used to place the welding part, and the inflation hole is used to connect to the air source.

[0007] In an optional embodiment, the airtightness detection device further includes a pneumatic component, which is located at the periphery of the lower cavity and is used to abut or release the top of the upper cavity.

[0008] In an optional embodiment, the number of pneumatic components is an even number, and the even number of pneumatic components are symmetrically arranged around the periphery of the lower cavity.

[0009] In an optional embodiment, the pneumatic assembly includes a pneumatic base and a pneumatic pressure rod, the pneumatic pressure rod is telescopically connected to the pneumatic base, and the pneumatic pressure rod is used to support or release the top of the upper cavity.

[0010] In an optional embodiment, the airtightness detection device further includes a guide pin, and the upper cavity is connected to the lower cavity via the guide pin.

[0011] In an optional embodiment, the air tightness detection device further includes a first sealing ring, a first sealing groove is formed at the outer edge of the positioning hole, and the first sealing ring cooperates with the first sealing groove to seal the current collecting plate and the positioning hole of the weldment.

[0012] In an optional embodiment, the airtightness detection device further includes a second sealing ring, a second sealing groove is formed at the outer edge of the first sealing groove, and the second sealing ring cooperates with the second sealing groove to seal the upper cavity and the lower cavity.

[0013] In an optional embodiment, the air tightness detection device also includes a third sealing ring, and a third sealing groove is opened at the outer edge of one end of the water injection hole close to the lower cavity. The third sealing ring cooperates with the third sealing groove to seal the chassis of the weldment and the water injection hole.

[0014] In an optional embodiment, the air tightness detection device further includes a sealing member, and the sealing member is used to seal the liquid injection hole of the welding member.

[0015] In an optional embodiment, the air tightness detection device further includes a fixing seat and a positioning pin, and the lower cavity is connected to the fixing seat via the positioning pin.

[0016] The beneficial effects of the embodiments of the utility model include:

[0017] In summary, the utility model provides an air tightness detection device, which includes an upper cavity and a lower cavity. In detail, the staff places the weldment into the positioning hole opened in the lower cavity, and then installs the upper cavity on the lower cavity. When performing an air tightness test, the air filling hole of the lower cavity is connected to the air source, and it is ensured that the lower cavity is pressurized by the air source, and then liquid is injected into the water injection hole of the upper cavity. Based on the above, the staff observes whether bubbles are generated on the surface of the weldment through the water injection hole. If there are no bubbles, the air tightness of the weldment passes, otherwise it fails. Therefore, the air tightness detection device provided by the utility model is simple to operate, takes less time, and helps to improve the detection efficiency of weldments. Not only that, the staff can find the leaking parts of the weldment by observing the water injection hole, so as to find out the improvement direction of the weldment and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the assembly of the airtightness detection device provided by the embodiment of the utility model;

[0020] Figure 2 An explosion diagram of the airtightness detection device provided by an embodiment of the utility model;

[0021] Figure 3 Another schematic diagram of the assembly of the airtightness detection device provided by the embodiment of the utility model;

[0022] Figure 4 The embodiment of the utility model provides Figure 3 Sectional view at AA;

[0023] Figure 5 The embodiment of the utility model provides Figure 4 A magnified schematic diagram of the structure at B in the middle;

[0024] Figure 6 The embodiment of the utility model provides Figure 4 Enlarged schematic diagram of the structure at point C in the middle.

[0025] Icons: 10-air tightness detection device; 100-upper cavity; 110-water injection hole; 130-third sealing groove; 300-lower cavity; 310-positioning hole; 330-inflating hole; 350-first sealing groove; 370-second sealing groove; 500-pneumatic assembly; 510-pneumatic base; 530-pneumatic pressure rod; 610-guide pin; 630-positioning pin; 650-fixed seat; 710-first sealing ring; 730-second sealing ring; 750-third sealing ring; 770-seal; 900-weld; 910-chassis; 930-collecting plate; 950-liquid injection hole. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0029] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0030] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] As mentioned in the background technology, in the prior art, the air tightness test of the first welded part is complicated, which can easily lead to problems such as long waiting time of the production line and reduced production efficiency. In order to improve the above problems, the utility model provides an air tightness test device, which can simplify the air tightness test steps, save the time of the first welded part test, and improve production efficiency.

[0033] Figure 1 This is a schematic diagram of the assembly of the airtightness detection device 10 provided in the embodiment of the utility model. Figure 2 For an exploded schematic diagram of the airtightness detection device 10 provided in the embodiment of the utility model, please refer to Figure 1 and Figure 2 The utility model provides an airtightness detection device 10 , which includes an upper cavity 100 and a lower cavity 300 .

[0034] Among them, the upper cavity 100 is penetrated by a water injection hole 110, the lower cavity 300 is detachably connected to the upper cavity 100, the lower cavity 300 is a cavity structure, and the lower cavity 300 is provided with a positioning hole 310 and an inflation hole 330, the positioning hole 310 is coaxially arranged with the water injection hole 110, and the positioning hole 310 is used to place the welding part 900, and the inflation hole 330 is used to connect with the gas source.

[0035] Based on the above settings, the staff places the welding piece 900 into the positioning hole 310 opened in the lower cavity 300, and then installs the upper cavity 100 on the lower cavity 300. During the above assembly process, the water injection hole 110 is aligned with the welding piece 900 to ensure the airtightness between the upper cavity 100 and the lower cavity 300.

[0036] Afterwards, the inflation hole 330 of the lower cavity 300 is connected to the air source and pressurized by the air source, and then liquid is injected into the water injection hole 110 of the upper cavity 100, and whether bubbles are generated on the surface of the weldment 900 is observed through the water injection hole 110. If there are no bubbles, the air tightness of the weldment 900 is passed, otherwise, the air tightness of the weldment 900 is not passed.

[0037] It can be understood that the airtightness detection device 10 provided by the utility model is easy to operate, takes less time, and helps to improve the detection efficiency of the welded part 900. In addition, the staff can find the leaking part of the welded part 900 by observing the water injection hole 110, so as to find out the improvement direction of the welded part 900. Based on the above two points, the airtightness detection device 10 also ensures that the welded part 900 can quickly proceed to the next process, thereby improving production efficiency.

[0038] See also Figure 3 Considering that the lower cavity 300 is a hollow structure, in order to avoid displacement between it and the upper cavity 100 during assembly and waste assembly time, the airtightness detection device 10 further includes a fixing seat 650 and a positioning pin 630, and the lower cavity 300 is connected to the fixing seat 650 through the positioning pin 630. Through the above arrangement, the lower cavity 300 is fixed on the fixing seat 650, and its counterweight is strengthened, thereby effectively avoiding the problem that the lower cavity 300 is always displaced during the installation process of the lower cavity 300 and the upper cavity 100.

[0039] See also Figure 4 and Figure 5 ,in, Figure 4 for Figure 3 Schematic diagram of the cross section at AA in the middle, Figure 5 for Figure 4In the enlarged schematic diagram of the structure at point B, when the weld 900 to be tested is provided with a liquid injection hole 950 or other hole-like structures, in order to ensure the reliability of the operation of the airtightness testing device 10, the airtightness testing device 10 also includes a sealing member 770, which is used to seal the liquid injection hole 950 of the weld 900.

[0040] In other embodiments, the porous structure may be sealed with glue in advance to avoid the problem of failure of the airtightness detection device 10 due to air leakage from the porous structure.

[0041] See also Figure 6 , Figure 6 for Figure 4 The enlarged schematic diagram of the structure at C in the middle. When the welding part 900 is placed, one side of the bottom cover is set upward and one side of the current collecting plate 930 is set downward. In order to enhance the sealing performance of the air tightness detection device 10, the air tightness detection device 10 also includes a first sealing ring 710, and a first sealing groove 350 is opened at the outer edge of the positioning hole 310. The first sealing ring 710 cooperates with the first sealing groove 350 to seal the current collecting plate 930 and the positioning hole 310 of the welding part 900. Based on the above, air leakage between the current collecting plate 930 and the positioning hole 310 of the welding part 900 is avoided.

[0042] Furthermore, the airtightness detection device 10 further includes a second sealing ring 730, and a second sealing groove 370 is provided at the outer edge of the first sealing groove 350. The second sealing ring 730 cooperates with the second sealing groove 370 to seal the upper cavity 100 and the lower cavity 300. It is understandable that the first sealing groove 350 and the second sealing groove 370 are coaxially spaced. It should be noted that, Figures 4 to 6 In the airtightness detection device 10 shown, the upper cavity 100 and the lower cavity 300 have not yet been completely press-fitted. When the upper cavity 100 and the lower cavity 300 are completely press-fitted, the second sealing ring 730 can abut against the bottom of the upper cavity 100 to achieve sealing.

[0043] Furthermore, the airtightness detection device 10 further includes a third sealing ring 750, and a third sealing groove 130 is provided at the outer edge of one end of the water injection hole 110 close to the lower cavity 300. The third sealing ring 750 cooperates with the third sealing groove 130 to seal the bottom plate 910 of the welding part 900 and the water injection hole 110. Based on the above, leakage between the bottom plate 910 end of the welding part 900 and the water injection hole 110 is avoided.

[0044] In some embodiments, please refer again to Figure 2In order to facilitate the positioning of the upper cavity 100 and the lower cavity 300, the airtightness detection device 10 also includes a guide pin 610, and the upper cavity 100 is connected to the lower cavity 300 through the guide pin 610. Through the above arrangement, not only the assembly operation is simplified and the assembly time is shortened, but also the stability of the upper cavity 100 and the lower cavity 300 after assembly is improved, ensuring the normal operation of the airtightness test. In addition, it should be noted that in this embodiment, the number of guide pins 610 is not limited, and the staff can set them adaptively according to the actual situation.

[0045] In order to further enhance the stability and sealing of the upper cavity 100 and the lower cavity 300 after assembly, the airtightness detection device 10 further includes a pneumatic component 500, which is located at the periphery of the lower cavity 300 and is used to resist or loosen the top of the upper cavity 100. Based on the above configuration, when the upper cavity 100 and the lower cavity 300 are assembled, the pneumatic component 500 applies a vertical force to the upper cavity 100, and cooperates with the self-weight of the upper cavity 100 to ensure that the upper cavity 100 and the lower cavity 300 are tightly fitted and installed tightly.

[0046] Considering that applying force to the upper cavity 100 on one side may affect the airtightness test device, the number of pneumatic components 500 is an even number, and the even number of pneumatic components 500 are symmetrically arranged on the outer periphery of the lower cavity 300. Based on the above arrangement, the force on the upper cavity 100 is ensured to be balanced, avoiding damage to the upper cavity 100 due to uneven force, and also avoiding the situation where the force-bearing side of the upper cavity 100 is closely fitted with the lower cavity 300, and the non-force-bearing side is tilted relative to the lower cavity 300.

[0047] In some embodiments, the pneumatic assembly 500 includes a pneumatic base 510 and a pneumatic pressure rod 530, the pneumatic pressure rod 530 is telescopically connected to the pneumatic base 510, and the pneumatic pressure rod 530 is used to resist or release the top of the upper cavity 100. Specifically, before the upper cavity 100 and the lower cavity 300 are assembled, the inside of the pneumatic base 510 is in a positive pressure state, and the pneumatic pressure rod 530 rises to reserve assembly space; after the upper cavity 100 and the lower cavity 300 are assembled, the inside of the pneumatic base 510 is in a negative pressure state, and the pneumatic pressure rod 530 descends to press the upper cavity 100 to ensure the sealing performance of the airtightness detection device 10.

[0048] Taking this embodiment as an example, the working principle and working process of the airtightness detection device 10 provided by the utility model are as follows:

[0049] When performing air tightness testing, the inside of the pneumatic base 510 is controlled to be in a positive air pressure state, so that the pneumatic pressure rod 530 rises to ensure that the assembly space of the upper cavity 100 is reserved. After that, the staff places the welded part 900 with the injection hole 950 sealed at the positioning hole 310 of the lower cavity 300, and makes the bottom cover of the welded part 900 face upwards, ensuring that the negative electrode collector 930 of the welded part 900 is tightly fitted with the first sealing ring 710.

[0050] Afterwards, the upper cavity 100 is positioned and installed with the lower cavity 300 through the guide pin 610, and the upper cavity 100 is pressed on the top of the welding piece 900, and the water injection hole 110 is aligned with the welding piece 900. Next, the inside of the pneumatic base 510 is controlled to be in a negative pressure state, so that the pneumatic pressure rod 530 descends and acts on the top of the upper cavity 100 to ensure the airtightness of the device.

[0051] Finally, liquid is injected into the water injection hole 110 of the upper cavity 100, and air is supplied to the inner cavity of the lower cavity 300 through the air filling hole 330 opened in the lower cavity 300, so that the interior of the lower cavity 300 is in a positive pressure state. After the above steps are completed, the staff observes whether there are bubbles near the welded part 900 in the water of the upper cavity 100. If there are no bubbles, the air tightness of the welded part 900 passes, otherwise it fails.

[0052] In summary, the utility model provides an air tightness detection device 10, which includes an upper cavity 100 and a lower cavity 300. In detail, the staff places the weldment 900 into the positioning hole 310 opened in the lower cavity 300, and then installs the upper cavity 100 on the lower cavity 300. When performing an air tightness test, the air filling hole 330 of the lower cavity 300 is connected to the air source, and it is ensured that the lower cavity 300 is pressurized by the air source, and then liquid is injected into the water injection hole 110 of the upper cavity 100. Based on the above, the staff observes whether bubbles are generated on the surface of the weldment 900 through the water injection hole 110. If there are no bubbles, the weldment 900 passes the air tightness test, otherwise it does not pass. Therefore, the air tightness detection device 10 provided by the utility model is simple to operate, takes less time, and helps to improve the detection efficiency of the weldment 900. Furthermore, the staff can find out the leaking part of the welded part 900 by observing the water injection hole 110, so as to find out the improvement direction of the welded part 900 and improve the production efficiency.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An airtightness detection device, characterized in that: The invention comprises an upper cavity (100) and a lower cavity (300), wherein the upper cavity (100) is provided with a water injection hole (110), and the lower cavity (300) is detachably connected to the upper cavity (100), and the lower cavity (300) is a hollow structure, and the lower cavity (300) is provided with a positioning hole (310) and an inflation hole (330), wherein the positioning hole (310) is coaxially arranged with the water injection hole (110), and the positioning hole (310) is used to place a welding part (900), and the inflation hole (330) is used to connect to an air source.

2. The airtightness detection device according to claim 1, characterized in that: The airtightness detection device (10) further comprises a pneumatic component (500), wherein the pneumatic component (500) is located at the outer periphery of the lower cavity (300) and is used to abut against or loosen the top of the upper cavity (100).

3. The airtightness detection device according to claim 2, characterized in that: The number of the pneumatic components (500) is an even number, and the even number of the pneumatic components (500) are symmetrically arranged on the outer periphery of the lower cavity (300).

4. The airtightness detection device according to claim 2, characterized in that: The pneumatic assembly (500) comprises a pneumatic base (510) and a pneumatic pressure rod (530), wherein the pneumatic pressure rod (530) is telescopically connected to the pneumatic base (510), and the pneumatic pressure rod (530) is used to abut or release the top of the upper cavity (100).

5. The airtightness detection device according to claim 1, characterized in that: The airtightness detection device (10) further comprises a guide pin (610), and the upper cavity (100) is connected to the lower cavity (300) via the guide pin (610).

6. The airtightness detection device according to claim 1, characterized in that: The air tightness detection device (10) further comprises a first sealing ring (710), a first sealing groove (350) is provided at the outer edge of the positioning hole (310), and the first sealing ring (710) cooperates with the first sealing groove (350) to seal the collecting plate (930) of the welding part (900) and the positioning hole (310).

7. The airtightness detection device according to claim 6, characterized in that: The airtightness detection device (10) further comprises a second sealing ring (730), a second sealing groove (370) is provided at the outer edge of the first sealing groove (350), and the second sealing ring (730) cooperates with the second sealing groove (370) to seal the upper cavity (100) and the lower cavity (300).

8. The airtightness detection device according to claim 1, characterized in that: The air tightness detection device (10) further comprises a third sealing ring (750), and a third sealing groove (130) is provided at the outer edge of one end of the water injection hole (110) close to the lower cavity (300). The third sealing ring (750) cooperates with the third sealing groove (130) to seal the bottom plate (910) of the welded part (900) and the water injection hole (110).

9. The airtightness detection device according to any one of claims 1 to 8, characterized in that: The airtightness detection device (10) further comprises a sealing member (770), wherein the sealing member (770) is used to seal the liquid injection hole (950) of the welding member (900).

10. The airtightness detection device according to any one of claims 1 to 8, characterized in that: The airtightness detection device (10) further comprises a fixing seat (650) and a positioning pin (630), and the lower cavity (300) is connected to the fixing seat (650) via the positioning pin (630).

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