CN117091765A

CN117091765A - Airtight detecting system and battery manufacturing production line

Info

Publication number: CN117091765A
Application number: CN202311348346.6A
Authority: CN
Inventors: 张宁; 连登伟; 周海伦; 余应丰; 钟惠英
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-10-18
Filing date: 2023-10-18
Publication date: 2023-11-21

Abstract

The application relates to an airtight detection system and a battery manufacturing production line. The airtight detecting system is used for detecting the airtight of a product to be detected, the product to be detected is provided with an inner cavity, a first air hole and a second air hole which are communicated with the inner cavity, the airtight detecting system is provided with an inflation mode, and the airtight detecting system comprises: the air source assembly comprises a pressure regulating valve and a trace air source, the pressure regulating valve comprises a pressure regulating main body and an air pressure detection unit, the pressure regulating main body is communicated between the trace air source and the first air hole, and the air pressure detection unit is arranged on the pressure regulating main body and is communicated with the second air hole; when the airtight detection system is in an inflation mode, the pressure regulating main body is opened, the air pressure detection unit detects air pressure at the second air hole and feeds the air pressure back to the pressure regulating main body, and the pressure regulating main body is configured to reduce the opening degree of the air pressure regulating main body when the air pressure at the second air hole is larger than a preset air pressure threshold value. Thus, the problem of low inflation efficiency and replacement efficiency of the trace gas can be alleviated, and the detection efficiency of the air tightness can be improved.

Description

Airtight detecting system and battery manufacturing production line

Technical Field

The application relates to the technical field of airtight detection, in particular to an airtight detection system and a battery manufacturing production line.

Background

In the manufacturing process of the product to be tested with high air tightness requirement, before leaving a factory, the air tightness of the product to be tested needs to be detected so as to judge whether the air tightness of the product to be tested is qualified or not.

In the detection process, the tracer gas is required to be introduced into the inner cavity of the product to be detected, at least part of air in the inner cavity of the product to be detected is replaced by the tracer gas, and the gas quantity of the tracer gas leaked from the outer surface of the product to be detected is detected by the detection device, so that the gas quantity can be used as a basis for judging whether the air tightness of the product to be detected is good or not. However, in the related art, the air-filling efficiency of the trace gas and the replacement efficiency of replacing the air in the inner cavity of the product to be measured are low, resulting in a decrease in the detection efficiency of the air tightness.

Disclosure of Invention

In view of the above, the present application provides an airtight detection system and a battery manufacturing line, which can alleviate the problems of low inflation efficiency and replacement efficiency of trace gas, thereby improving the detection efficiency of the airtight.

An airtight detecting system for detect the gas tightness of product to be measured, the product to be measured has inner chamber and all with the first gas pocket and the second gas pocket of inner chamber intercommunication, airtight detecting system has the mode of aerifing, and airtight detecting system includes:

The air source assembly comprises a pressure regulating valve and a trace air source, the pressure regulating valve comprises a pressure regulating main body and an air pressure detection unit, the pressure regulating main body is communicated between the trace air source and the first air hole, and the air pressure detection unit is arranged on the pressure regulating main body and is communicated with the second air hole;

when the airtight detection system is in an inflation mode, the pressure regulating main body is opened, the air pressure detection unit detects air pressure at the second air hole and feeds the air pressure back to the pressure regulating main body, and the pressure regulating main body is configured to reduce the opening degree of the air pressure regulating main body when the air pressure at the second air hole is larger than a preset air pressure threshold value.

In the application, the air pressure detection unit is communicated with the second air hole, and the air pressure of the second air hole is equal to the air pressure in the inner cavity. Therefore, the air pressure at the second air hole detected by the air pressure detection unit can truly reflect the air pressure in the inner cavity. Under the condition, the pressure regulating main body can accurately regulate the opening degree according to the air pressure at the second air hole, and the opening degree is regulated when the air pressure at the second air hole is smaller than or equal to a preset air pressure threshold value, so that the air charging efficiency and the replacement efficiency of the trace gas are improved, and further, the air tightness detection efficiency is also improved.

In some embodiments of the application, the air source assembly further comprises a tracer valve and a tracer pipe, the tracer pipe is communicated between the tracer air source and the pressure regulating main body, and the tracer valve is matched and connected to the tracer pipe;

When the airtight detection system is in the inflation mode, the tracer valve is open.

Through setting up tracer valve and tracer pipe, when the tracer valve is opened, can make things convenient for the tracer air supply to pass through the tracer pipe with tracer gas input to the product that awaits measuring in, promoted the reliability that the gas tightness detected.

In some embodiments of the application, the airtight detection system further comprises a displacement mode; the air source assembly further comprises an air source, an air pipe and an air valve, one end of the air pipe is communicated with the tracer pipe positioned between the tracer valve and the pressure regulating main body, the other end of the air pipe is communicated with the air source, and the air valve is connected to the air pipe in a matched mode;

when the airtight detection system is in a replacement mode, the tracer valve is closed, and the pressure regulating main body and the air valve are both opened;

the air valve is closed when the air tightness detection system is in the inflation mode.

By arranging the air source, the air pipe and the air valve and combining the tracing valve and the tracing pipe, the airtight detection system can be freely switched between an inflation mode and a replacement mode, and the working reliability is high.

In some embodiments of the application, the airtight detection system further has a negative pressure pumping mode; the air tightness detection system also comprises an air extraction component which is communicated with the third air hole;

The airtight detection system is in a negative pressure pumping mode and an inflation mode, and before the air pressure in the inner cavity reaches a preset air pressure threshold value, the air pumping assembly is used for pumping part of air in the inner cavity.

Therefore, the setting of the air extraction assembly facilitates the trace gas to be input into the inner cavity, and is favorable for realizing uniform mixing of the trace gas and the air.

In some embodiments of the present application, the air extraction assembly includes an air extraction pump, an air extraction pipe and an air extraction valve, the air extraction pipe is communicated between the third air hole and the air extraction pump, and the air extraction valve is connected to the air extraction pipe in a matching way;

the airtight detection system is in a negative pressure pumping mode and an inflation mode, and before the air pressure in the inner cavity reaches an inflation threshold value, the air pumping valve and the air pumping pump are opened.

The air extraction valve and the air extraction pump are opened, and the air in the product to be tested can be discharged to the outside through the air extraction pipe and the air extraction pump, so that the reliability of the air output is ensured. When the air extraction valve and the air extraction pump are closed, the air in the inner cavity can be effectively prevented from being exhausted, and leakage of trace gas in the inner cavity is reduced.

In some embodiments of the application, the airtight detection system further comprises an adsorption component;

the airtight detection system is in a negative pressure pumping mode and an inflation mode, and when the air pressure in the inner cavity is negative pressure, the adsorption component is used for adsorbing the weak part of the strength of the product to be detected.

Through setting up the adsorption component, when the inner chamber is the negative pressure, the absorptive effort of adsorption component can offset the effort of partial atmospheric pressure at least, and the risk of intensity weak portion deformation reduces. Thereafter, when the air pressure in the inner cavity rises at least equal to the atmospheric pressure, the risk of the weak portion being deformed by the atmospheric pressure suddenly drops, at which time the adsorption assembly may be deactivated. Therefore, the setting of the adsorption component can reduce the risk of deformation of the product to be tested when the suction component works, and is beneficial to improving the reliability of air tightness detection.

In some embodiments of the application, the airtight detection system further has a cycling mode; the airtight detection system further comprises a circulation assembly;

when the airtight detection system is in a circulation mode, the circulation component is used for circulating the gas output by the third air hole into the inner cavity through the first air hole;

when the airtight detection system is in the inflation mode and the negative pressure pumping mode, the circulation assembly is closed.

Through setting up circulating assembly, when circulating assembly starts, tracer gas and air only circulate in circulating assembly and inner chamber under circulating assembly's effect for tracer gas and air can intensive mixing, and then, when follow-up gas tightness detects, spill over to the gas on product surface that awaits measuring in evenly distributed have tracer gas and can be detected by detection device sensitivity. In addition, the arrangement of the circulating assembly can also reduce the possibility that the gas in the inner cavity is diffused to the outside in the process of mixing the tracer gas and the air, and reduce the waste of the tracer gas.

In some embodiments of the present application, the circulation assembly includes a circulation pump, a circulation valve, and a circulation pipe, the circulation pump is communicated with the first air hole and the third air hole through the circulation pipe, and the circulation valve is coupled to the circulation pipe;

when the airtight detection system is in a circulation mode, the circulation valve and the circulation pump are both opened;

and when in the inflation mode and the negative pressure pumping mode, the circulating valve and the circulating pump are closed.

And due to the arrangement of the circulating pump, the circulating pipe and the circulating valve, the reliability of gas circulation during the operation of the circulating assembly is improved.

In some embodiments of the application, the air supply assembly further comprises a pressure measuring tube, wherein the pressure measuring tube is communicated between the air pressure detection unit and the second air hole;

the airtight detection system also comprises an air pressure detection part, wherein the air pressure detection part is connected to the pressure measuring tube in a matching way and is always used for detecting the air pressure in the pressure measuring tube.

Therefore, in the application, the air pressure detection part is arranged, so that the air pressure in the product to be detected can be detected in real time, and the air pressure in the product to be detected can be monitored in real time.

A battery manufacturing line comprising an airtight detection system according to any one of the embodiments described above.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:

FIG. 1 is a schematic diagram of an airtight detection system according to one or more embodiments of the present application.

FIG. 2 is an exploded view of an adsorbent assembly and a product to be tested according to one or more embodiments of the present application.

Reference numerals:

100. an airtight detection system;

10. an air source assembly; 20. an air extraction assembly; 30. an adsorption assembly; 40. a circulation assembly; 50. a pressure measuring part; 60. a controller;

11. a pressure regulating valve; 111. a pressure regulating body; 112. an air pressure detecting unit; 12. a trace gas source; 13. a tracer valve; 14. a tracer tube; 15. an air source; 16. an air tube; 17. an air valve; 18. a communicating pipe; 19. a pressure measuring tube;

21. an air extracting pump; 22. an exhaust pipe; 23. an extraction valve;

31. a substrate; 32. a vacuum chuck;

41. a circulation pump; 42. a circulation pipe; 43. a circulation valve;

2000. a product to be tested; 2100. a first air hole; 2200. a second air hole; 2300. a third air hole; 2400. a strength weak portion; 2500. an inner cavity.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.

In the related art, an airtight detection system is generally used to detect the airtight of a product to be detected, so as to provide a basis for judging whether the airtight of the product to be detected is good or not. In the actual detection process, the tracer gas is required to be introduced into the inner cavity of the product to be detected, at least part of air in the inner cavity of the product to be detected is replaced by the tracer gas, and then the gas quantity of the tracer gas leaked from the surface of the product to be detected is detected by the detection device, so that the air tightness of the product to be detected can be judged. It can be understood that, since the main component of the gas in the product to be tested is the tracer gas after the tracer gas displaces at least part of the air, the more the amount of the leaked tracer gas, the worse the air tightness of the product to be tested, and conversely, the better the air tightness of the product to be tested. However, in the related art, the air-filling efficiency of the trace gas and the replacement efficiency of replacing the air in the product to be tested are low, resulting in a decrease in the detection efficiency of the air tightness.

Among these, the main causes of low tracer gas charging and replacement efficiency are: in the airtight detection system, a pressure regulating valve arranged between a tracing air source and a product to be detected is positioned at the tracing air source end and is far away from the product to be detected, and an air pressure detection unit on the pressure regulating valve is positioned outside the product to be detected and is used for detecting the air pressure of the tracing air on an input path of the tracing air input into the product to be detected. The pressure of the trace gas gradually decreases as the trace gas flows along the trace gas input path. Thus, when the tracer gas in the interior cavity of the product to be tested does not reach the inflation threshold, the gas pressure in the input path of the tracer gas is typically greater than the gas pressure in the interior cavity of the product to be tested.

The air pressure detection unit is used for taking the detected air pressure on the trace gas input path as the air pressure in the product to be detected, when the air pressure detection unit feeds the detected air pressure on the trace gas input path back to the pressure regulating main body, and when the air pressure reaches the preset air pressure threshold value, the pressure regulating main body mistakenly judges that the air pressure in the inner cavity of the product to be detected also reaches the preset air pressure threshold value, and then the opening of the air pressure regulating main body is reduced, so that the air flow of the trace gas input into the product to be detected is reduced. At this time, however, the air pressure in the inner cavity of the product to be measured is actually smaller than the preset air pressure threshold. Under such a situation, the action of the pressure regulating body to reduce the opening degree thereof will reduce the flow rate of the tracer gas introduced into the inner cavity of the product to be measured, so that the inflation efficiency of the tracer gas and the replacement efficiency of the replacement air are reduced, and the detection efficiency of the air tightness is also reduced.

In order to solve the problem of low tracer gas charging efficiency and replacement efficiency, the application provides a gas tightness detection system, in the system, a product to be detected is provided with an inner cavity, a first gas hole and a second gas hole which are communicated with the inner cavity, a pressure regulating main body is communicated between a tracer gas source and the first gas hole, and a gas pressure detection unit is communicated with the second gas hole.

In such an embodiment, the tracer gas of the tracer gas source enters the interior cavity of the product to be tested sequentially through the pressure regulating body and the first gas orifice. The air pressure at the second air hole is consistent with the air pressure in the inner cavity of the product to be detected, so that the air pressure at the second air hole detected by the air pressure detection unit is the air pressure in the inner cavity of the product to be detected, and the air pressure detection unit can truly feed back the air pressure in the inner cavity of the product to be detected. When the air pressure at the second air hole fed back by the air pressure detection unit is larger than a preset air pressure threshold value, the pressure regulating main body can truly and accurately judge that the air pressure in the product to be detected also reaches the preset air pressure threshold value, and then the opening of the air regulating main body is reduced, so that the air flow of the tracer gas input is reduced.

Therefore, under the design of the application, the air pressure detection unit can truly feed back the air pressure in the inner cavity of the product to be detected to the pressure regulating main body, so that the pressure regulating main body can accurately regulate the opening degree of the air pressure detecting unit when the air pressure at the second air hole is larger than a preset air pressure threshold value. In this way, the inflation efficiency and the replacement efficiency of the trace gas are improved, and the detection efficiency of the airtight detection system is also improved.

Referring to fig. 1, fig. 1 is a schematic diagram illustrating an airtight detection system 100 according to one or more embodiments of the present application.

In a first aspect, embodiments of the present application provide an air tightness detection system 100 for air tightness detection of a product 2000 to be tested. The product 2000 to be tested may be, but not limited to, a battery, and the product 2000 to be tested may also be a product with a requirement on air tightness, such as a camera, a lamp, and the like. For convenience of description, the following embodiments will take the product 2000 to be tested as a battery as an example. The gas tightness of the battery is low, external water vapor easily enters the battery and affects the operation of the battery, the gas tightness of the battery is high, external water vapor is difficult to enter the battery, and the reliability of the operation of the battery is high.

The product 2000 to be tested has an inner cavity 2500 and a first air hole 2100 and a second air hole 2200 both communicating with the inner cavity 2500. The airtight detection system 100 has an inflation mode, the airtight detection system 100 comprises an air source assembly 10, the air source assembly 10 comprises a pressure regulating valve 11 and a trace air source 12, the pressure regulating valve 11 comprises a pressure regulating main body 111 and an air pressure detection unit 112, the pressure regulating main body 111 is communicated between the trace air source 12 and the first air hole 2100, and the air pressure detection unit 112 is arranged on the pressure regulating main body 111 and is communicated with the second air hole 2200. When the airtight detecting system 100 is in the inflation mode, the pressure regulating body 111 is opened, the air pressure detecting unit 112 detects the air pressure at the second air hole 2200 and feeds back to the pressure regulating body 111, and the pressure regulating body 111 is configured to reduce its opening degree when the air pressure at the second air hole 2200 is greater than a preset air pressure threshold value.

The trace gas source 12 may be a hydrogen gas source, a helium gas source, or the like, and when the trace gas source 12 is a hydrogen gas, the trace gas is helium gas when the trace gas source 12 is a helium gas source. A detection device capable of sensing the trace gas is provided within the airtight detection system 100. The detection device is located outside the product 2000 to be detected, and is used for sensing the gas quantity of the tracer gas overflowed to the surface of the product 2000 to be detected. If the gas quantity of the trace gas sensed by the detection device is larger, the air tightness of the product 2000 to be detected is poorer, otherwise, the air tightness of the product 2000 to be detected is better. The detection device and the manner in which the detection device senses the amount of trace gas are conventional in the art, and therefore will not be described in detail herein.

The inflation mode is a mode that instructs the trace gas source 12 to inflate the interior 2500 of the product 2000 to be tested with trace gas. In the process of filling the inner cavity 2500 with the trace gas, the gas quantity of the trace gas in the inner cavity 2500 can be increased, so that when the gas of the subsequent product 2000 to be detected leaks, a large quantity of trace gas is carried in the gas and can be captured by the detection device. The more trace gas is filled into the inner cavity 2500 by the trace gas source 12, the larger the gas amount of the trace gas in the inner cavity 2500, and the higher the detection precision and sensitivity of the subsequent detection device.

Specifically, the trace gas source 12 itself may have a pressure substantially greater than the gas pressure in the interior 2500, and the trace gas source 12 may charge the interior 2500 of the product 2000 under test with the trace gas under its own pressure. Alternatively, an inflator may be provided in the air supply assembly 10, and the tracer gas may be pumped into the interior cavity 2500 of the product 2000 under test by the inflator. Alternatively still, a portion of the gas in the lumen 2500 may be evacuated to create a negative pressure in the lumen 2500, and the tracer gas may then flow into the lumen 2500 under the influence of the negative pressure. Of course, the manner in which the trace gas source 12 charges the interior 2500 with trace gas is not limited to the above, but may be other manners, and is not limited thereto.

The opening of the pressure regulating body 111 means that the opening of the pressure regulating body 111 is greater than 0, and the closing of the pressure regulating body 111 means that the opening of the pressure regulating body 111 is 0. In the inflation mode, the pressure regulating body 111 remains open at all times.

The internal space between the air pressure detecting unit 112 and the pressure regulating body 111 is not communicated, so that the air pressure detected by the air pressure detecting unit 112 is not affected when the trace gas passes through the pressure regulating body 111. Specifically, the air pressure detecting unit 112 is electrically connected to the pressure regulating body 111, the air pressure detecting unit 112 feeds back the detected air pressure at the second air hole 2200 to the pressure regulating body 111, and the pressure regulating body 111 adjusts its opening according to the air pressure fed back by the air pressure detecting unit 112, so as to change the flow rate of the input trace gas.

The air pressure at the first air hole 2100 and the second air hole 2200 is consistent with the air pressure in the inner cavity 2500, and the air pressure at the second air hole 2200 detected by the air pressure detecting unit 112 is the air pressure in the inner cavity 2500. The air pressure in the lumen 2500 should be increased to the inflation threshold before detection by the detection device begins. The inflation threshold is the air pressure value at which the air in lumen 2500 has a reasonable leak rate. When the air pressure in the inner cavity 2500 reaches the inflation threshold, the tracer gas source 12 stops inflating the inner cavity 2500, and the inner cavity 2500 of the product 2000 to be detected is subjected to air tightness detection under the air pressure, and the tracer gas leaked to the surface of the product 2000 to be detected is captured by the detection device. The preset air pressure threshold is an air pressure value smaller than but close to the inflation threshold, and the preset air pressure threshold and the inflation threshold are both larger than the atmospheric pressure.

In order to rapidly raise the air pressure in the inner cavity 2500 to the inflation threshold, when the air pressure in the inner cavity 2500 is less than or equal to the preset air pressure threshold, the pressure regulating body 111 increases the opening degree and increases the flow rate of the charged trace gas so as to improve the inflation efficiency. When the air pressure in the inner cavity 2500 is greater than the preset air pressure threshold, the pressure regulating body 111 reduces the opening and reduces the flow of the injected trace gas to reduce the possibility of over-inflation of the inner cavity 2500 resulting in over-inflation of the air.

Therefore, in the actual operation process, when the air pressure fed back to the pressure regulating body 111 by the air pressure detecting unit 112 is less than or equal to the preset air pressure threshold value, the pressure regulating body 111 increases its opening degree. When the air pressure fed back to the pressure regulating body 111 by the air pressure detecting unit 112 is greater than the preset air pressure threshold, the pressure regulating body 111 reduces its opening.

In the related art, the product 2000 to be measured is provided with only the first gas orifice 2100, and the pressure regulating valve 11 is located on the input path of the trace gas into the product 2000 to be measured and is far from the product 2000 to be measured. The pressure of the trace gas gradually decreases as the trace gas flows along the trace gas input path. Thus, when the tracer gas within the interior 2500 of the product 2000 under test does not reach the inflation threshold, the pressure of the tracer gas in the input path is generally greater than the pressure of the tracer gas within the interior 2500 of the product 2000 under test. The air pressure detection unit 112 uses the detected air pressure on the trace gas input path as the air pressure in the product 2000 to be detected, which is inaccurate, and causes the pressure regulating main body 111 to misuse that the air pressure in the product 2000 to be detected is larger and also reaches the preset air pressure threshold value, so as to reduce the opening of the main body. Thus, the flow rate of the trace gas in the product 2000 to be measured is reduced, the charging efficiency and the replacement efficiency of the trace gas are both reduced, and the detection efficiency of the air tightness is also reduced.

In the present application, however, since the air pressure detecting unit 112 communicates with the second air hole 2200, and the air pressure of the second air hole 2200 is equal to the air pressure in the inner cavity 2500. Therefore, the air pressure at the second air hole 2200 detected by the air pressure detecting unit 112 can truly reflect the air pressure in the inner cavity 2500. In this case, the pressure regulating body 111 can accurately regulate its opening according to the air pressure at the second air hole 2200, and can increase the opening when the air pressure at the second air hole 2200 is less than or equal to the preset air pressure threshold, which is beneficial to improving the inflation efficiency and replacement efficiency of the trace gas, and further, the detection efficiency of the air tightness is also improved.

It should be understood that, in the present application, the air pressure detecting unit 112 should be disposed at the end 2000 of the product to be detected and close to the product 2000 to be detected, so as to improve the accuracy of the detection.

In one or more embodiments of the present application, the air source assembly 10 further includes a tracer valve 13 and a tracer pipe 14, the tracer pipe 14 is communicated between the tracer air source 12 and the pressure regulating body 111, and the tracer valve 13 is coupled to the tracer pipe 14; when the airtight detection system 100 is in the inflation mode, the tracer valve 13 is opened.

The tracer valve 13 may be a mechanical valve or an electromagnetic valve, and may be specifically set as required.

When in the inflation mode, the tracer valve 13 and the pressure regulating main body 111 are opened, and the tracer gas of the tracer gas source 12 enters the inner cavity 2500 of the product 2000 to be detected through the tracer pipe 14, the pressure regulating main body 111 and the first gas hole 2100, so that the gas quantity of the tracer gas in the inner cavity 2500 is improved, and the air tightness of the product 2000 to be detected can be conveniently detected by a subsequent detection device.

By arranging the tracer valve 13 and the tracer pipe 14, when the tracer valve 13 is opened, the tracer gas source 12 can conveniently input tracer gas into the product 2000 to be detected through the tracer pipe 14, and the reliability of air tightness detection is improved.

Further, in one or more embodiments of the present application, the airtight detection system 100 further includes a substitution pattern; the air source assembly 10 further comprises an air source 15, an air pipe 16 and an air valve 17, one end of the air pipe 16 is communicated with the tracer pipe 14 between the tracer valve 13 and the pressure regulating main body 111, the other end of the air pipe 16 is communicated with the air source 15, and the air valve 17 is matched and connected on the air pipe 16. When the airtight detecting system 100 is in the replacement mode, the tracer valve 13 is closed, and the pressure regulating main body 111 and the air valve 17 are both opened; when the air tightness detection system 100 is in the inflation mode, the air valve 17 is closed.

The replacement mode is a mode in which the air source 15 supplies air to the cavity 2500 of the product 2000 to be tested, so that the air replaces the trace gas. After the replacement mode is finished, the cavity 2500 of the product 2000 to be tested is mainly air, and the product 2000 to be tested can be normally used.

When the airtight detection system 100 is in the inflation mode, the pressure regulating body 111 and the tracer valve 13 are both opened, and the air valve 17 is closed, so as to reduce the possibility of the air source 15 inputting air into the inner cavity 2500; when the airtight detecting system 100 is in the replacement mode, the pressure regulating body 111 and the air valve 17 are both opened, the tracer valve 13 is closed, and the air source 15 inputs air into the cavity 2500 of the product 2000 to be detected, so as to replace the tracer gas in the cavity 2500.

By providing the air source 15, the air pipe 16 and the air valve 17, and combining the tracer valve 13 and the tracer pipe 14, the airtight detecting system 100 can be freely switched between the inflation mode and the replacement mode, and the operation reliability is high.

In one or more embodiments of the present application, the airtight detection system 100 further has a negative pressure pumping mode, a third air hole 2300 communicating with the inner cavity 2500 is formed on the product 2000 to be detected, and the airtight detection system 100 further includes an air pumping assembly 20, where the air pumping assembly 20 communicates with the third air hole 2300; the pumping assembly 20 is configured to pump a portion of the gas from the interior cavity 2500 before the air tightness detection system 100 is in the negative pumping mode, the inflation mode, and the air pressure in the interior cavity 2500 reaches a preset air pressure threshold.

The negative pressure pumping mode refers to a mode that the pumping assembly 20 pumps out part of the gas in the inner cavity 2500 of the product 2000 to be tested, so that the inner cavity 2500 is under negative pressure. In this mode, the air pressure in the lumen 2500 is negative and the gas drawn is air. And when the negative pressure pumping mode is finished, switching the tracer gas into an inflation mode.

In the inflation mode, the trace gas source 12 inputs trace gas into the interior cavity 2500 such that the gas pressure in the interior cavity 2500 increases gradually. Initially, the air pressure in the cavity 2500 remains at a negative pressure, and as the input of trace gas increases, the air pressure in the cavity 2500 increases gradually. When the air pressure of the lumen 2500 is greater than 0, the negative pressure in the lumen 2500 is converted to a positive pressure.

The trace gas source 12 then continues to supply trace gas into the interior cavity 2500, with a concomitant increase in the gas pressure within the interior cavity 2500. When the air pressure in the interior 2500 reaches a preset air pressure threshold, the air extraction assembly 20 ceases to operate and the trace air source 12 continues to inflate until the air pressure in the interior 2500 reaches an inflation threshold.

It will be appreciated that in order to reduce the air pressure in the interior cavity 2500 when the air extraction assembly 20 is operating in the negative pressure extraction mode, the trace air source 12 may automatically flow to the interior cavity 2500. The pumping assembly 20 operates in the inflation mode to continue to expel air from the interior cavity 2500 and mix the air with the trace gas. In the negative pressure pumping mode, the air pressure in the interior 2500 is less than atmospheric pressure, and in the inflation mode, the air pressure in the interior 2500 is three conditions of less than atmospheric pressure, equal to atmospheric pressure, and greater than atmospheric pressure.

When the airtight detection system 100 is in the inflation mode, before the air pressure in the inner cavity 2500 reaches the preset air pressure threshold, the air extraction assembly 20 in the airtight detection system 100 works, so that the trace gas in the trace gas source 12 can automatically flow into the inner cavity 2500, so that the gas quantity of the trace gas in the inner cavity 2500 is improved, and the trace gas is conveniently captured by a subsequent detection device. On the other hand, the operation of the air extraction assembly 20 may also accelerate the speed and uniformity of mixing of the trace gas with the air. The more uniform the tracer gas and air mix, the higher and more accurate the efficiency of follow-up detection device to detect the gas tightness.

When the air pressure in the lumen 2500 reaches a preset air pressure threshold, the aspiration assembly is turned off. At this point, the trace gas source 12 continues to charge the interior cavity 2500 with trace gas to further increase the amount of trace gas in the interior cavity 2500 until the gas pressure in the interior cavity 2500 reaches the inflation threshold. It will be appreciated that when the air pressure in the inner cavity 2500 reaches the preset air pressure threshold, the suction assembly is turned off, so that the discharge of air in the inner cavity 2500 can be reduced, and the air pressure in the inner cavity 2500 can be quickly increased to the air inflation threshold, so that the air inflation efficiency is high.

It can be seen that the provision of the bleed assembly 20 facilitates the input of the tracer gas into the cavity 2500 and facilitates uniform mixing of the tracer gas with the air.

Further, in one or more embodiments of the present application, the pumping assembly 20 includes a pumping pump 21, a pumping pipe 22 and a pumping valve 23, the pumping pipe 22 is connected between the third air hole 2300 and the pumping pump 21, and the pumping valve 23 is coupled to the pumping pipe 22; the air tightness detection system 100 is in the negative pressure pumping mode, the air charging mode and the air pumping valve 23 and the air pumping pump 21 are opened before the air pressure in the inner cavity 2500 reaches the air charging threshold value.

The air extraction valve 23 and the air extraction pump 21 are opened, and the air in the product 2000 to be tested can be discharged to the outside through the air extraction pipe 22 and the air extraction pump 21, so that the reliability of the air output is ensured. When the air extraction valve 23 and the air extraction pump 21 are closed, the air in the inner cavity 2500 can be effectively prevented from being exhausted, and leakage of trace air in the inner cavity 2500 is reduced.

Referring again to fig. 1, and concurrently to fig. 2, fig. 2 is an exploded view of an adsorption assembly 30 and a product 2000 to be tested according to one or more embodiments of the present application.

In one or more embodiments of the present application, the airtight detection system 100 further includes an adsorption assembly 30; the adsorption assembly 30 is used to adsorb the weak portion 2400 of the product 2000 to be tested when the air tightness detection system 100 is in the negative pressure pumping mode and the air filling mode and the air pressure in the inner cavity 2500 is negative pressure.

The adsorbent assembly 30 may be a magnetic adsorbent, a vacuum adsorbent or other adsorbent assembly 30. Illustratively, the suction assembly 30 includes a substrate 31 and a vacuum chuck 32, the vacuum chuck 32 being disposed on one side of the substrate 31 and may be one or more. When there are a plurality of vacuum chucks 32, all of the vacuum chucks 32 may be used to collectively suck the same strength weak portion 2400, or each vacuum chuck 32 may be used to suck the corresponding strength weak portion 2400 one by one.

Taking the product 2000 to be tested as a battery, the battery comprises a box body and a battery unit, wherein the box body is provided with an inner cavity 2500, and the battery unit is arranged in the inner cavity 2500. The box comprises first part and second part, and first part is the hollow structure that one end open-ended one end was sealed, and the second part can be platy or be the hollow structure that one end open-ended one end was sealed, and the second part covers in the opening part of first part to enclose with first part and establish the inner chamber 2500. When the battery is placed in the cavity 2500, the battery cells are carried on the first portion. Generally, the first portion has a greater mechanical strength than the second portion, and thus the second portion is a weak portion 2400 in the product 2000 to be tested. In this embodiment, the adsorption assembly 30 is located on a side of the second portion facing away from the first portion and adsorbs the first portion.

Since the mechanical strength of the strength weak portion 2400 is relatively weak, the strength weak portion 2400 is easily deformed under the action of the atmospheric pressure in the case that the inner cavity 2500 is at the negative pressure, resulting in disqualification of the product 2000 to be measured. By providing the adsorption assembly 30, when the lumen 2500 is at negative pressure, the force exerted by the adsorption assembly 30 can at least counteract part of the force exerted by the atmospheric pressure, and the risk of deformation of the strength weaknesses 2400 is reduced. Thereafter, when the air pressure in the lumen 2500 increases at least equal to the air pressure, the risk of deformation of the strength weakpoint 2400 by the air pressure suddenly decreases, at which time the adsorption assembly 30 may be deactivated. Therefore, the arrangement of the adsorption component 30 can reduce the risk of deformation of the product 2000 to be tested when the suction component works, and is beneficial to improving the reliability of air tightness detection.

In one or more embodiments of the application, the airtight detection system 100 also has a cyclic mode; the air tightness detection system 100 further comprises a circulation assembly 40; when the airtight detecting system 100 is in the circulation mode, the circulation assembly 40 is configured to circulate the gas output from the third gas hole 2300 into the inner cavity 2500 through the first gas hole 2100. The circulation assembly 40 is shut down when the air tightness detection system 100 is in the inflation mode and the negative pressure pumping mode.

The circulation mode refers to a mode in which the circulation assembly 40 drives a circulation flow of gas in the inner chamber 2500.

In the circulation mode, the circulation assembly 40 is activated, and at the same time, the pumping assembly is turned off so that the gas in the interior 2500 circulates only through the circulation assembly 40 and the interior 2500 of the product 2000 to be tested. The circulation assembly 40 is closed while in the inflation mode, the negative pressure pumping mode and the replacement mode.

Through setting up circulation subassembly 40, when circulation subassembly 40 starts, tracer gas and air only circulate in circulation subassembly 40 and inner chamber 2500 under circulation subassembly 40's effect for tracer gas and air can intensive mixing, and then, during the follow-up gas tightness detection, spill over to the gas on the surface of the product 2000 that awaits measuring in evenly distributed have tracer gas and can be detected by detection device sensitivity. In addition, the circulation assembly 40 can reduce the possibility of the gas in the inner cavity 2500 diffusing to the outside in the process of mixing the trace gas and the air, and reduce the waste of the trace gas.

In one or more embodiments of the present application, the circulation assembly 40 includes a circulation pump 41, a circulation valve 43, and a circulation pipe 42, the circulation pump 41 being in communication with the first air hole 2100 and the third air hole 2300 through the circulation pipe 42, the circulation valve 43 being coupled to the circulation pipe 42; when the airtight detecting system 100 is in the circulation mode, both the circulation valve 43 and the circulation pump 41 are opened; in the inflation mode and the negative pressure pumping mode, the circulation valve 43 and the circulation pump 41 are both closed.

The circulation assembly 40 includes two circulation pipes 42 and two circulation valves 43, the two circulation pipes 42 and the two circulation valves 43 are in one-to-one correspondence, and each circulation valve 43 is assembled on the corresponding circulation pipe 42. The air source assembly 10 further includes a communication pipe 18, wherein the communication pipe 18 is communicated between the pressure regulating body 111 and the first air hole 2100, one of the circulation pipes 42 is communicated between the circulation pump 41 and the communication pipe 18, and the other circulation pipe 42 is communicated between the circulation pump 41 and the air extraction pipe 22.

When the circulation pump 41 and the circulation valve 43 are both opened, the gas in the inner cavity 2500 can circulate in the inner cavity 2500 of the product 2000 to be tested and in the circulation assembly 40, so as to realize the full mixing of the trace gas and the air.

The arrangement of the circulating pump 41, the circulating pipe 42 and the circulating valve 43 improves the reliability of gas circulation when the circulating assembly 40 works.

In some embodiments of the present application, the air supply assembly 10 further includes a pressure measuring tube 19, the pressure measuring tube 19 being in communication between the air pressure detecting unit 112 and the second air hole 2200; the airtight detecting system 100 further includes an air pressure detecting member coupled to the pressure measuring tube 19 and always used for detecting the air pressure in the pressure measuring tube 19.

When the pressure measuring tube 19 is connected between the air pressure detecting unit 112 and the second air hole 2200, the air pressure in the measuring tube is consistent with the air pressure at the second air hole 2200, the air pressure in the inner cavity 2500 of the product 2000 to be measured, the air pressure detected by the air pressure detecting unit 112, and the air pressure detected by the air pressure detecting member.

The air pressure detecting member may be a pressure gauge, a pressure sensor or other air pressure detecting instrument.

The air pressure detecting member is always used for monitoring the air pressure in the product 2000 to be detected. Always refer to the period from the time when the product 2000 to be tested is placed in the airtight detecting system 100 and assembled with the airtight detecting system 100, to the time when the airtight detection is finished.

It is understood that the pressure detecting unit 112 of the pressure regulating valve 11 measures pressure only when the pressure regulating body 111 of the pressure regulating valve 11 is opened and feeds back into the pressure regulating body 111, and when the pressure regulating body 111 is closed, the pressure measuring function of the pressure detecting unit 112 fails. Specifically, in the airtight detecting system 100, when the airtight detecting system 100 is in the inflated state and the replaced state, the pressure of the air pressure detecting unit 112 is measured and fed back to the pressure regulating body 111, and when the airtight detecting system 100 is in the negative pressure pumping state and the circulating state, the pressure measuring function of the air pressure detecting unit 112 is disabled.

In the airtight detecting system 100, when the airtight detecting system 100 is in the inflated state, the replaced state, the negative pressure pumping state and the circulating state, the air pressure detecting member can be used for detecting the air pressure of the cavity 2500 of the product 2000 to be detected. Thus, in the whole air tightness detection process, when the air pressure in the inner cavity 2500 is abnormal, an operator can know and take emergency measures in time. For example, if the air pressure detected by the air pressure detecting member suddenly drops sharply, it indicates that the air tightness of the product 2000 to be tested is seriously disqualified, so that the product needs to be returned to the factory for re-detection and troubleshooting. If the air pressure detected by the air pressure detecting member suddenly and abruptly rises, it indicates that the air source assembly 10 may malfunction, and the air source assembly 10 needs to be checked and maintained.

Therefore, in the application, by arranging the air pressure detecting piece, the air pressure detecting piece can detect the air pressure in the product 2000 to be detected in real time, which is beneficial to real-time monitoring of the air pressure in the product 2000 to be detected.

In one or more embodiments of the present application, the airtight detection system 100 further includes a controller 60, the pressure regulating body 111, the trace air source 12, the trace valve 13, the air source 15 and the air valve 17 in the air source assembly 10, the air pump 21 and the air pump valve 23 in the air pump assembly 20, the circulation pump 41 and the circulation valve 43 in the circulation assembly 40, and the air pressure detecting member are electrically connected to the controller 60. The above elements all operate under the control of the controller 60 to enable automation of the airtight detection.

Next, the operation of the entire airtight inspection system 100 will be described in detail.

Initially, the airtight detecting system 100 starts the negative pumping mode, at this time, the controller 60 controls the pumping valve 23 and the pumping pump 21 to be opened, and the controller 60 controls the circulation valve 43, the pressure regulating body 111, the tracing valve 13 and the air valve 17 to be closed, so that part of the air in the cavity 2500 of the product 2000 to be detected is pumped out under the action of the pumping pump 21, and the air pressure in the cavity 2500 is reduced to the negative pressure.

Then, the airtight detecting system 100 is turned on to the inflation mode, the controller 60 controls the air extraction valve 23 and the air extraction pump 21 to be opened, controls the pressure regulating main body 111 and the tracing valve 13 to be opened, and controls the other circulation valve 43 and the air valve 17 to be continuously closed, the tracing gas in the tracing gas source 12 is input into the inner cavity 2500, and at the same time, the gas mixed with the tracing gas in the inner cavity 2500 and the air is continuously discharged to the outside under the action of the air extraction assembly 20. In this way, the mixing force of the trace gas and the air in the inner cavity 2500 can be increased, and meanwhile, part of the air can be further discharged, so that the ratio of the trace gas in the inner cavity 2500 can be improved.

With the continuous input of the trace gas, the proportion of trace gas in the inner cavity 2500 is increased, and the proportion of air is reduced, so that displacement of the trace gas to the air is realized gradually. In this process, the air pressure detecting unit 112 detects the air pressure at the second air hole 2200 and feeds back the air pressure to the pressure regulating main body 111, and when the air pressure at the second air hole 2200 is less than or equal to the preset air pressure threshold value, the pressure regulating main body 111 regulates the opening of the air pressure regulating main body to realize efficient input of the tracer gas into the inner cavity 2500. When the air pressure at the second air hole 2200 is greater than the preset air pressure threshold, the air extraction valve 23 and the air extraction pump 21 are both closed, the pressure regulating main body 111 is turned down, the trace air source 12 continues to input trace air until the air pressure in the inner cavity 2500 of the product 2000 to be detected rises to the inflation threshold.

After that, the tracer valve 13 and the pressure regulating body 111 are closed, the air valve 17 and the air suction valve 23 are kept closed, the circulation valve 43 and the circulation pump 41 are opened, and the airtight detection system 100 opens the circulation mode. The gas circulates in the cavity 2500 and the circulation assembly 40 under the action of the circulation pump 41 to achieve thorough mixing of the trace gas with the air. Thus, the gas overflowing from the product 2000 to be measured is mixed with the trace gas having a high concentration, and the sensitivity of detection is high.

It should be noted that when the inflation threshold in the cavity 2500 is equal to the pressure of the trace gas source 12, the trace valve 13 and the pressure regulating body 111 may be closed or opened when they are in a circulation state.

After the air tightness detection step is completed, the air valve 17, the pressure regulating main body 111 and the air extraction valve 23 are all opened, the tracer valve 13 and the circulation valve 43 are closed, the air tightness detection system 100 is opened in a replacement mode, and under the action of the air extraction pump 21, the air in the air source 15 is input into the inner cavity 2500 and is mixed with the air in the inner cavity 2500 for output. With continued action of the suction pump, the trace gas in the lumen 2500 is eventually displaced by air and the air tightness test ends.

In a second aspect, the present application provides a battery manufacturing line comprising an air tightness detection system 100 according to any of the embodiments described above.

The battery manufacturing line of the present application has the effects described in any one of the above embodiments, and thus will not be described herein.

Referring to fig. 1 and 2, the present application provides an airtight detection system 100 for detecting the airtight performance of a product 2000 to be detected, wherein the product 2000 to be detected has an inner cavity 2500 and a first air vent 2100 and a second air vent 2200 both communicating with the inner cavity 2500, the airtight detection system 100 has an inflation mode, and the airtight detection system 100 includes an air source assembly 10. The air source assembly 10 comprises a pressure regulating valve 11 and a trace air source 12, wherein the pressure regulating valve 11 comprises a pressure regulating main body 111 and an air pressure detection unit 112, the pressure regulating main body 111 is communicated between the trace air source 12 and the first air hole 2100, and the air pressure detection unit 112 is arranged on the pressure regulating main body 111 and is communicated with the second air hole 2200; when the airtight detecting system 100 is in the inflation mode, the pressure regulating body 111 is opened, the air pressure detecting unit 112 detects the air pressure at the second air hole 2200 and feeds back to the pressure regulating body 111, and the pressure regulating body 111 is configured to reduce its opening degree when the air pressure at the second air hole 2200 is greater than a preset air pressure threshold value.

In the airtight detecting system 100 of the present application, since the air pressure detecting unit 112 communicates with the second air hole 2200, and the air pressure of the second air hole 2200 is equal to the air pressure in the inner cavity 2500. Therefore, the air pressure at the second air hole 2200 detected by the air pressure detecting unit 112 can truly reflect the air pressure in the inner cavity 2500. In this case, the pressure regulating body 111 can accurately regulate its opening according to the air pressure at the second air hole 2200, and can increase the opening when the air pressure at the second air hole 2200 is less than or equal to the preset air pressure threshold, which is beneficial to improving the inflation efficiency and replacement efficiency of the trace gas, and further, the detection efficiency of the air tightness is also improved.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims

1. An airtight detection system for detecting the airtight property of a product (2000) to be detected, the product (2000) to be detected having an inner cavity (2500) and a first air hole (2100) and a second air hole (2200) both communicating with the inner cavity (2500), characterized in that the airtight detection system has an inflation mode, and the airtight detection system comprises:

the air source assembly (10) comprises a pressure regulating valve (11) and a trace air source (12), the pressure regulating valve (11) comprises a pressure regulating main body (111) and an air pressure detection unit (112), the pressure regulating main body (111) is communicated between the trace air source (12) and the first air hole (2100), and the air pressure detection unit (112) is arranged on the pressure regulating main body (111) and is communicated with the second air hole (2200);

when the airtight detection system is in the inflation mode, the pressure regulating main body (111) is opened, the air pressure detection unit (112) detects the air pressure at the second air hole (2200) and feeds back the air pressure to the pressure regulating main body (111), and the pressure regulating main body (111) is configured to reduce the opening degree of the air pressure regulating main body (111) when the air pressure at the second air hole (2200) is greater than a preset air pressure threshold value.

2. The tightness detection system according to claim 1, wherein said air supply assembly (10) further comprises a tracer valve (13) and a tracer pipe (14), said tracer pipe (14) being in communication between said tracer air supply (12) and said pressure regulating body (111), said tracer valve (13) being coupled to said tracer pipe (14);

the tracer valve (13) is opened when the airtight detection system is in the inflation mode.

3. The airtight detection system of claim 2, wherein the airtight detection system further comprises a substitution pattern; the air source assembly (10) further comprises an air source (15), an air pipe (16) and an air valve (17), one end of the air pipe (16) is communicated with the tracer pipe (14) positioned between the tracer valve (13) and the pressure regulating main body (111), the other end of the air pipe (16) is communicated with the air source (15), and the air valve (17) is connected to the air pipe (16) in a matching mode;

when the airtight detection system is in the replacement mode, the tracer valve (13) is closed, and the pressure regulating main body (111) and the air valve (17) are both opened;

the air valve (17) is closed when the airtight detection system is in the inflation mode.

4. A gas tightness detection system according to any of claims 1 to 3 wherein the gas tightness detection system further has a negative pressure pumping mode; a third air hole (2300) communicated with the inner cavity (2500) is formed in the product (2000) to be detected, the airtight detection system further comprises an air extraction component (20), and the air extraction component (20) is communicated with the third air hole (2300);

the airtight detection system is in a negative pressure pumping mode, the inflation mode and before the air pressure in the inner cavity (2500) reaches the preset air pressure threshold value, the air pumping assembly (20) is used for pumping part of air in the inner cavity (2500).

5. The airtight detection system according to claim 4, wherein the air extraction assembly (20) comprises an air extraction pump (21), an air extraction pipe (22) and an air extraction valve (23), the air extraction pipe (22) is communicated between the third air hole (2300) and the air extraction pump (21), and the air extraction valve (23) is coupled to the air extraction pipe (22);

the air tightness detection system is in the negative pressure pumping mode, the air charging mode and before the air pressure in the inner cavity (2500) reaches an air charging threshold value, the air suction valve (23) and the air suction pump (21) are both opened.

6. The airtight detection system of claim 4, further comprising an adsorption assembly (30);

the air tightness detection system is in the negative pressure pumping mode and the air charging mode, and when the air pressure in the inner cavity (2500) is negative pressure, the adsorption component (30) is used for adsorbing the weak part (2400) of the product (2000) to be detected.

7. The airtight detection system of claim 4, wherein the airtight detection system further has a cyclic mode; the airtight detection system further comprises a circulation assembly (40);

the circulation assembly (40) is configured to circulate the gas output by the third gas hole (2300) into the lumen (2500) through the first gas hole (2100) when the airtight detection system is in the circulation mode;

the circulation assembly (40) is closed when the airtight detection system is in the inflation mode and the negative pressure pumping mode.

8. The airtight detection system according to claim 7, wherein the circulation assembly (40) includes a circulation pump (41), a circulation valve (43) and a circulation pipe (42), the circulation pump (41) being in communication with the first air hole (2100) and the third air hole (2300) through the circulation pipe (42), the circulation valve (43) being coupled to the circulation pipe (42);

When the airtight detection system is in the circulation mode, the circulation valve (43) and the circulation pump (41) are both opened;

in the inflation mode and the negative pressure pumping mode, the circulation valve (43) and the circulation pump (41) are both closed.

9. The airtight detection system according to claim 1, wherein the air supply assembly (10) further comprises a pressure measuring tube (19), the pressure measuring tube (19) being in communication between the air pressure detection unit (112) and the second air hole (2200);

the airtight detection system further comprises an air pressure detection piece, wherein the air pressure detection piece is connected to the pressure measuring tube (19) in a matching mode and is always used for detecting air pressure in the pressure measuring tube (19).

10. A battery manufacturing line, characterized in that it comprises a tightness detection system according to any of claims 1-9.