CN216717707U

CN216717707U - Airtightness detection device and airtightness detection device for single battery

Info

Publication number: CN216717707U
Application number: CN202220241452.9U
Authority: CN
Inventors: 唐玲珑; 张毅飞; 王宏达; 林纲; 温裕乾
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-06-10
Anticipated expiration: 2032-01-28

Abstract

The application provides an air tightness detection device and an air tightness detection device for a single battery, which comprise an air exhaust detection mechanism, wherein the air exhaust detection mechanism can carry out vacuum treatment on the periphery of a detected area in a detected object and detect the content of specific gas around the detected area; the air exhaust detection mechanism comprises a first sealing cover, an air exhaust assembly, a detection assembly and an isolation assembly. The first sealing cover covers the detected area and separates the detected area from the external environment, and the air exhaust assembly is connected to the first sealing cover and is used for exhausting at least part of air in the first sealing cover; the detection assembly is connected to the first sealing cover and used for detecting the content of the specific gas in the first sealing cover; the isolation assembly is arranged in the first sealing cover and can be positioned between the tested area and the air exhaust assembly so as to isolate the tested area from the air exhaust assembly. The embodiment of the application sets up isolated subassembly between the subassembly of bleeding and the region under test, realizes the protection to the region under test.

Description

Airtightness detection device and airtightness detection device for single battery

Technical Field

The application relates to the field of sealing detection, in particular to an air tightness detection device and an air tightness detection device for single batteries.

Background

Energy conservation and emission reduction are the key points of sustainable development of the automobile industry, and electric vehicles become important components of the sustainable development of the automobile industry due to the advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in its development. After the production of the battery is finished, the performance of multiple parameters of the battery needs to be detected, and whether the battery meets the factory requirements or not is judged. The required parameter performance detection performance comprises the air tightness of the battery, but the detection accuracy is difficult to ensure by the existing air tightness detection device for the battery unit.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the present application provides an air tightness detection device and battery monomer are with air tightness detection device, can avoid the subassembly of bleeding to take out the specific gas in the region under test, improves the accuracy of testing result.

On one hand, the embodiment of the application provides an air tightness detection device which comprises an air exhaust detection mechanism, wherein the air exhaust detection mechanism can carry out vacuum treatment on the periphery of a detected area in a detected object and detect the content of specific gas around the detected area; the air exhaust detection mechanism comprises a first sealing cover, an air exhaust assembly, a detection assembly and an isolation assembly.

The first sealing cover covers the detected area and separates the detected area from the external environment, and the air exhaust assembly is connected to the first sealing cover and used for exhausting at least part of air in the first sealing cover; the detection assembly is connected with the first sealing cover and is used for detecting the content of the specific gas in the first sealing cover; the isolation assembly is arranged in the first sealing cover and can be positioned between the tested area and the air exhaust assembly so as to isolate the tested area from the air exhaust assembly.

The embodiment of the application utilizes first sealed cowling to be isolated by regional and external environment, then through evacuation operation and gas detection operation, realizes the detection to being surveyed regional gas tightness. Wherein still be provided with isolated subassembly in the first sealed cowling for when the evacuation operation, will be surveyed the region and isolate with the subassembly of bleeding, avoid bleeding the subassembly and will be surveyed the regional specific gas of intra-area and take out, thereby improve the accuracy of testing result.

In some embodiments, the first sealing cover is located on a side of the measured area facing away from the measured object and covers the measured area.

According to the embodiment of the application, the first sealing cover is arranged on one side of the measured object, and the first sealing cover only covers the measured area. The size of the first sealing cover can be reduced to a large extent through the design, the detected area can be locally detected, the influence of other areas on the detection result is reduced, and the detection precision can be improved while the cost of the air tightness detection device is reduced.

In some embodiments, the first sealing cover is provided with a first accommodating cavity and a second accommodating cavity, the area to be measured is located in the first accommodating cavity, the air exhaust assembly is communicated with the second accommodating cavity, the isolation assembly is located between the first accommodating cavity and the second accommodating cavity, and the first accommodating cavity and the second accommodating cavity can be controlled to be communicated or isolated.

Isolated subassembly is located first chamber and the second of holding and holds between the chamber in this application embodiment, and during evacuation, isolated subassembly holds the chamber with first chamber and the second of holding and isolates to utilize the subassembly of bleeding to hold the intracavity gas with the second and take out, hold the influence of intracavity gas to the testing result with the reduction second, improve the reliability of testing result.

In some embodiments, the volume ratio of the second containing cavity to the first containing cavity is A, wherein A ≧ 10.

The second holds the cavity and the second ratio that holds the cavity sets up to be not less than 10 with this application embodiment, guarantees to bleed the subassembly and can take away most gas in the first sealed cowling, ensures the accuracy of final testing result.

In some embodiments, the first sealing cover is a hollow structure with an opening, the first sealing cover is provided with a third accommodating cavity, the object to be tested is located in the third accommodating cavity, and the air exhaust assembly is communicated with the third accommodating cavity through the opening.

The air tightness detection device in the embodiment of the application is suitable for the situation that local detection cannot be performed on the detected area, at the moment, the first sealing cover is arranged around the periphery of the detected object, and the detected object is detected through the whole structure including the detected area.

In some embodiments, an isolation assembly is positioned within the third receiving cavity and is in communication with the opening.

This application embodiment will completely cut off the subassembly setting and hold the intracavity and be linked together with the opening in the third, realize through completely cut off the subassembly that the third holds switching on or completely closing up of chamber and external environment, be applicable to the condition that the testee can't carry out local detection, simple structure and detection are reliable.

In some embodiments, the isolation assembly includes a solenoid valve and/or a flapper valve.

The first sealing cover can be communicated or isolated with the air exhaust assembly and the detection assembly by using control valves such as the electromagnetic valve or the baffle valve, the structure is simple and reliable, meanwhile, the automatic control of the air exhaust detection mechanism can be realized by using the electromagnetic valve and/or the baffle valve, and the reliability of the whole detection process is ensured.

In some embodiments, the gas exhaust detection mechanism is further provided with a gas pipeline, the gas pipeline comprises a main pipeline connected to the first sealing cover and at least two branch pipelines communicated with the main pipeline, and the gas exhaust assembly and the detection assembly are respectively communicated with different branch pipelines.

First sealed cowling in the embodiment of this application only can realize and bleed subassembly and detection module's intercommunication respectively through a gas pipeline, and this kind of design only need set up one on first sealed cowling be used for with the air vent of gas pipeline intercommunication, need not additionally to set up a plurality of air vents to the structural reliability of first sealed cowling of indirect reinforcing reduces the risk that the gas in the external environment enters into to first sealed cowling in through the gas pipeline.

In some embodiments, the gas tightness detection device further comprises a gas injection mechanism, wherein the gas injection mechanism can deliver specific gas around the detected area, and the gas injection mechanism comprises a second sealing cover and a gas transmission assembly; the second sealing cover is provided with a fourth containing cavity, and the detected area is positioned in the fourth containing cavity; the gas transmission component transmits specific gas to the surrounding of the tested area through the fourth containing cavity.

The gas tightness detection device of this application embodiment is including extracting gas detection mechanism in addition, still including the gas injection mechanism, and the gas injection mechanism is earlier to being carried specific gas around the regional detected, then extracts gas detection mechanism and is detecting the specific gas content around the regional detected, judges whether there is gas leakage in the regional detected. The gas injection mechanism is matched with the gas extraction detection mechanism for use, so that the accurate and precise detection result is ensured

On the other hand, the embodiment of the application provides a gas tightness detection device for battery cell, including battery cell and the gas tightness detection device of any preceding embodiment, battery cell includes casing, electrode subassembly and end cover subassembly.

The shell is a hollow structure body with a containing part, the electrode assembly is arranged in the containing part, and the end cover assembly covers one end of the shell along the first direction and comprises a liquid injection hole penetrating through the end cover assembly along the first direction and a sealing piece for sealing the liquid injection hole. Wherein the first seal cover covers the seal.

The airtightness detection device provided by the embodiment of the application is used for detecting the airtightness at the position of the liquid injection hole of the single battery and judging whether the single battery has a leakage phenomenon. The design has the advantages that helium does not need to be injected into the liquid injection hole in advance when the single battery is manufactured, the airtightness detection device cannot damage the shell of the single battery, and the reliability is high.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an evacuation detection mechanism in an air-tightness detection device provided in an embodiment of the present application;

FIG. 2 is an enlarged view of the structure of the region Q shown in FIG. 1;

FIG. 3 is a schematic structural diagram of another evacuation detection mechanism in the air tightness detection device according to the embodiment of the present application;

FIG. 4 is a schematic structural diagram of another evacuation detection mechanism in the air tightness detection device provided in the embodiment of the present application;

FIG. 5 is a schematic structural diagram of a gas injection mechanism in a gas tightness detection device according to an embodiment of the present application;

FIG. 6 is an enlarged view of the structure of region R of FIG. 5;

fig. 7 is a schematic structural diagram of an air tightness detection device for a battery cell according to an embodiment of the present application;

fig. 8 is an enlarged view of the structure of the region S shown in fig. 7.

In the drawings:

1-an air extraction detection mechanism; 11-a first sealing boot; 111-a first containment chamber; 112-a second receiving chamber; 113-a third receiving chamber; 114-an opening; 115-an upper cover body; 116-a lower housing; 12-a pumping assembly; 13-a detection component; 14-an insulating component; 15-a gas pipeline; 151-main conduit; 152-branch pipes;

2-a gas injection mechanism; 21-a second sealing cover; 211-a fourth containing chamber; 22-a gas delivery assembly;

3-the object to be tested; 31-a housing; 32-an end cap assembly; 321-liquid injection hole; 322-a seal;

b-a region under test; x-a first direction.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The battery has the advantages of high energy density, cyclic charging, safety, environmental protection and the like, so the battery is widely applied to the fields of new energy automobiles, consumer electronics, energy storage systems and the like. After the existing battery is installed, various parameter performances of the battery need to be detected, and the battery can leave a factory if the battery meets standard specification indexes. The air tightness detection is an essential ring in battery detection, and particularly, whether the battery liquid filling hole is completely sealed or not needs to be judged in a mode of air leakage detection and the like. In the process, the area where the liquid injection hole is located is often required to be subjected to vacuum treatment, but because the size of the liquid injection hole is small, detection gas in the liquid injection hole is easily pumped out during vacuum treatment, and the final detection precision is affected.

Based on the problem that the detection gas in the detected area is easily extracted by the vacuum treatment, the embodiment of the application provides the air tightness detection device, which can protect the detected area during the vacuum treatment. It is understood that the air tightness detection device provided by the embodiment of the present application may be applied to the field of batteries, and may also be applied to other fields, which is not limited by the embodiment of the present application.

The battery described in the embodiments of the present application is suitable for electric devices such as mobile phones, portable devices, notebook computers, battery cars, electric automobiles, ships, spacecraft such as airplanes, rockets, space shuttle and spacecraft, electric toys such as electric toys including stationary or mobile electric toys, specifically, game machines, electric automobile toys, electric ship toys, electric airplane toys, and the like, electric tools such as metal cutting electric tools, grinding electric tools, assembly electric tools, and electric tools for railways, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

On one hand, please refer to fig. 1 and fig. 2, an embodiment of the present application provides an air tightness detecting apparatus, which includes an exhaust detecting mechanism 1, where the exhaust detecting mechanism 1 is capable of performing vacuum processing around a detected region B in a detected object 3, and detecting a specific gas content around the detected region B; the suction detection mechanism 1 comprises a first sealing cover 11, a suction assembly 12, a detection assembly 13 and an isolation assembly 14.

The first sealing cover 11 covers the tested area B and separates the tested area B from the external environment, and the air exhaust assembly 12 is connected to the first sealing cover 11 and used for exhausting at least part of air in the first sealing cover 11; the detection assembly 13 is connected to the first sealing cover 11 and is used for detecting the content of the specific gas in the first sealing cover 11; the isolation component 14 is disposed in the first sealing cover 11, and the isolation component 14 can be located between the region B to be tested and the air pumping component 12, so as to isolate the region B to be tested from the air pumping component 12.

The first sealing cover 11 includes a containing cavity for containing the measured area B, and the first sealing cover 11 can separate the measured area B of the measured object 3 from the external environment, so as to avoid the influence of the external environment air on the detection result, wherein the size and shape of the first sealing cover 11 is not limited in this embodiment, as long as the first sealing cover 11 can cover the measured area B of the measured object 3. Optionally, the first sealing cover 11 is separably contacted with the object to be detected 3, and when detection is needed, the first sealing cover 11 moves to a specific position and covers the detected area B; after the detection is finished, the first sealing cover 11 is separated from the object to be detected 3, so that the object to be detected 3 is conveniently separated from the detection position.

The air exhaust assembly 12 is used for exhausting at least part of air in the first sealing cover 11, so as to reduce the influence of the air initially existing in the first sealing cover 11 on the detection result, and the air exhaust assembly 12 can be communicated with the first sealing cover 11 through a pipeline and the like. The air exhaust assembly 12 may be integrally communicated with the first sealing cover 11, or may be separately communicated with the first sealing cover, which is not limited in the embodiment of the present application.

The detecting component 13 is used for detecting the content of the specific gas in the first sealing cover 11 to determine whether the detected area B of the object to be detected 3 is air-leakage. Specifically, when the gas extraction detection mechanism 1 works, firstly, the gas extraction assembly 12 is used for pre-vacuumizing the interior of the first sealing cover 11 to extract at least part of gas existing in the first sealing cover 11, after the vacuum treatment is completed, the object to be measured 3 and the gas extraction detection mechanism 1 are subjected to standing treatment, and the detection assembly 13 works after standing for a period of time to detect the content of the specific gas in the first sealing cover 11. If the sealing condition of the region B to be detected is good, the detection unit 13 cannot detect the presence of the specific gas in the first seal cover 11; on the contrary, if the sealing condition of the detected region B is poor, the detecting component 13 will detect a certain amount of specific gas in the first sealing cover 11. Therefore, whether the detected area B of the object 3 is air-leakage can be judged through the cooperation of the air extracting component 12 and the detecting component 13.

It is understood that the detection assembly 13 may be the same as the air extraction assembly 12, and the communication with the first sealing cover 11 is realized by using a pipeline or the like, which is not limited by the embodiment of the present application. For the specific gas used for detection, a trace gas such as helium, argon, etc. may be used, which is not limited in the embodiments of the present application.

In addition, this application embodiment has still add isolated subassembly 14 on first sealed cowling 11, the subassembly 12 of bleeding, detecting element 13's basis, and isolated subassembly 14 is used for keeping apart by regional B and the subassembly 12 of bleeding to in the subassembly 12 course of working of bleeding, protect by regional B and avoid the influence of evacuation operation, reduce the influence or even destruction of gas tightness detection device to regional B under test, improve the reliability of testing process.

Before the pumping module 12 works, the isolation module 14 may be located between the region B to be measured and the pumping module 12, wherein the isolation module 14 may be movably disposed, that is, before the pumping operation, the isolation module 14 moves to cover the region B to be measured, so as to isolate the pumping module 12 from the region B to be measured. Or the isolation assembly 14 can be kept stationary, that is, the isolation assembly 14 is always located between the region B to be tested and the air pumping assembly 12, and during the vacuum processing, the isolation assembly 14 is in an isolation state to isolate the air pumping assembly 12 from the region B to be tested; during the detection, the isolation assembly 14 is in a communication state to communicate the detection assembly 13 with the detected region B. The embodiments of the present application are not limited to the particular arrangement of the insulation assembly 14.

The embodiment of the application utilizes the first sealing cover 11 to isolate the detected area B from the external environment, and then realizes the detection of the air tightness of the detected area B through the vacuumizing operation and the gas detection operation. Wherein, the first sealing cover 11 is further provided with an isolation assembly 14 for isolating the detected region B from the air pumping assembly 12 during the vacuum pumping operation, so as to prevent the air pumping assembly 12 from pumping out the specific gas in the detected region B, thereby improving the accuracy of the detection result.

As shown in fig. 1 and 2, in some embodiments, the first sealing cover 11 is located on a side of the measured area B facing away from the measured object 3 and covers the measured area B.

The first sealing cover 11 is located on one side of the object to be measured 3, and the first sealing cover 11 is attached to the plane of the area to be measured B. The orthographic projection of the first sealing cover 11 on the object to be measured 3 covers the area to be measured B and is located in the outer contour of the object to be measured 3. It is understood that the size of the first sealing cap 11 is determined according to the size of the region B to be measured.

In the embodiment of the present application, the first sealing cover 11 is disposed on one side of the object to be measured 3, and the first sealing cover 11 is disposed to cover only the area to be measured B. The size of the first sealing cover 11 can be greatly reduced, the detected area B can be locally detected, the influence of other areas on the detection result is reduced, and the detection precision can be improved while the cost of the air tightness detection device is reduced.

As shown in fig. 1 and 2, in some embodiments, the first sealing cover 11 has a first accommodating cavity 111 and a second accommodating cavity 112, the region B to be measured is located in the first accommodating cavity 111, the air exhaust assembly 12 is communicated with the second accommodating cavity 112, and the isolation assembly 14 is located between the first accommodating cavity 111 and the second accommodating cavity 112 and can control the first accommodating cavity 111 and the second accommodating cavity 112 to be conducted or isolated.

The region B to be measured is exposed in the first accommodating cavity 111, and the first accommodating cavity 111 and the second accommodating cavity 112 are controlled by the isolation component 14 to be conducted or isolated. The gas-extracting assembly 12 is configured to extract gas from the second accommodating cavity 112, so that a vacuum environment is formed in the second accommodating cavity 112, and the influence of the gas initially existing in the second accommodating cavity 112 on the detection result is avoided. Optionally, the detection assembly 13 is communicated with the second accommodating cavity 112, when the detection assembly 13 works, the first accommodating cavity 111 and the second accommodating cavity 112 are in a conducting state, and if the detected region B leaks air, the specific gas can be diffused into the second accommodating cavity 112 from the first accommodating cavity 111, so that the detection assembly 13 detects the specific gas.

In the embodiment of the present application, the isolation component 14 is located between the first accommodating cavity 111 and the second accommodating cavity 112, during the vacuum pumping, the isolation component 14 isolates the first accommodating cavity 111 from the second accommodating cavity 112, and the gas in the second accommodating cavity 112 is pumped out by using the pumping component 12, so that the influence of the gas in the second accommodating cavity 112 on the detection result is reduced, and the reliability of the detection result is improved.

In some embodiments, the volume ratio of the second receiving cavity 112 to the first receiving cavity 111 is A, wherein A ≧ 10.

It can be understood that the larger the volume of the second accommodating chamber 112 compared with the first accommodating chamber 111, the more gas in the first sealing cover 11 can be pumped out by the pumping assembly 12, so that the influence of the gas in the first sealing cover 11 on the detection result during the detection process is smaller, i.e. the detection result can be more accurate. Therefore, in order to improve the accuracy of the final detection result, in the embodiment of the present application, the ratio of the second accommodating cavity 112 to the second accommodating cavity 112 is set to be not less than 10, so that the pumping assembly 12 can pump away most of the gas in the first sealing cover 11, and the accuracy of the final detection result is ensured.

Referring to fig. 3, in some embodiments, the first sealing cover 11 is a hollow structure having an opening 114, the first sealing cover 11 has a third accommodating cavity 113, the object 3 to be tested is located in the third accommodating cavity 113, and the air-extracting assembly is communicated with the third accommodating cavity 113 through the opening 114.

The air tightness detection device in the embodiment of the present application is suitable for a situation where the local detection of the detected region B cannot be performed, and at this time, the first sealing cover 11 surrounds the periphery of the detected object 3, and detects the entire structure of the detected object 3 including the detected region B. Optionally, the first sealing cover 11 includes an upper cover 115 and a lower cover 116 detachably connected, the opening 114 is disposed on the upper cover 115, when in use, the object to be tested 3 is first disposed on the lower cover 116, then the upper cover 115 and the lower cover 116 are fixedly sealed, so as to form a third accommodating cavity 113 capable of accommodating the object to be tested 3, and finally the opening 114 is respectively communicated with the air exhaust assembly and the detection assembly, so as to perform vacuum processing and specific gas content detection in the following process.

As shown in fig. 3, in some embodiments, the isolation assembly 14 is located within the third receiving chamber 113 and is in communication with the opening 114.

The third accommodating cavity 113 is communicated with the outside through the opening 114, and the isolation assembly 14 is arranged in the third accommodating cavity 113 and communicated with the opening 114 in the embodiment of the application, that is, the communication or isolation between the third accommodating cavity 113 and the outside environment can be controlled through the isolation assembly 14. As can be seen from the above, the opening 114 can be respectively communicated with the air-extracting component and the detecting component, so that the isolating component 14 can control the conduction between the air-extracting component and the third accommodating cavity 113, and also can control the conduction between the detecting component and the third accommodating cavity 113.

This application embodiment will insulate subassembly 14 setting and hold chamber 113 in the third and be linked together with opening 114, realize the third through insulating subassembly 14 and hold chamber 113 and external environment's the condition that switches on or insulate, be applicable to the testee 3 and can't carry out the local condition that detects, simple structure and detection are reliable.

In some embodiments, isolation assembly 14 includes a solenoid valve and/or a flapper valve.

The first sealing cover 11 can be conducted or isolated with the air exhaust assembly and the detection assembly by using control valves such as an electromagnetic valve or a baffle valve, the structure is simple and reliable, meanwhile, the automatic control of the air exhaust detection mechanism 1 can be realized by using the electromagnetic valve and/or the baffle valve, and the reliability of the whole detection process is ensured.

Referring to fig. 4, in some embodiments, the gas exhaust detection mechanism 1 further includes a gas pipeline 15, the gas pipeline 15 includes a main pipeline 151 connected to the first sealing cover 11 and at least two branch pipelines 152 communicated with the main pipeline 151, and the gas exhaust assembly 12 and the detection assembly 13 are respectively communicated with different branch pipelines 152.

The pumping assembly 12 and the detecting assembly 13 are both communicated with the first sealing cover 11 through a gas pipeline 15, wherein the gas pipeline 15 comprises a main pipeline 151 and at least two branch pipelines 152 communicated with the main pipeline 151. When the pumping detection mechanism 1 is in a vacuum pumping operation, the pumping assembly 12 operates, at least a portion of the gas in the first sealing cover 11 enters the branch pipeline communicated with the pumping assembly 12 through the main pipeline 151, and is finally sucked away by the pumping assembly 12. When the air suction detection mechanism 1 is in a gas detection operation, the detection component 13 works, if the detected region B leaks air, specific gas leaks from the detected region B, enters a branch pipeline communicated with the detection component 13 through the main pipeline 151, and is finally detected by the detection component 13. Optionally, control valves are further disposed on different branch pipes 152, and are used for respectively controlling the communication between the air pumping assembly 12 and the first sealing cover 11, and the detection assembly 13. Specifically, when the evacuation detection mechanism 1 is in the evacuation operation, the valve on the branch pipe 152 communicated with the detection assembly 13 is closed, the valve on the branch pipe 152 communicated with the evacuation assembly 12 is opened, and the evacuation assembly 12 is communicated with the first seal cover 11 and evacuates the gas in the first accommodating chamber 111; when the gas pumping detection mechanism 1 is in gas detection operation, the valve on the branch pipe 152 communicated with the gas pumping assembly 12 is closed, the valve on the branch pipe 152 communicated with the detection assembly 13 is opened, the detection assembly 13 is communicated with the first sealing cover 11, and the content of the specific gas in the first sealing cover 11 is detected.

First sealed cowling 11 in the embodiment of this application only can realize communicating respectively with air exhaust component 12 and detection module 13 through a gas pipeline 15, and this kind of design only need set up one on first sealed cowling 11 and be used for the air vent with gas pipeline 15 intercommunication, need not additionally to set up a plurality of air vents to the indirect structural reliability who strengthens first sealed cowling 11 reduces the risk that the gas in the external environment enters into in first sealed cowling 11 through gas pipeline 15.

Referring to fig. 5 and 6, in some embodiments, the airtightness detection apparatus further includes a gas injection mechanism 2, the gas injection mechanism 2 is capable of delivering a specific gas around the detected region B, and the gas injection mechanism 2 includes a second sealing cover 21 and a gas transmission assembly 22; the second seal cover 21 has a fourth accommodation cavity 211, and the region B to be measured is located in the fourth accommodation cavity 211; the gas delivery assembly 22 delivers a specific gas around its area to be measured via the fourth receiving chamber 211.

Before the object to be measured 3 reaches the air suction detection mechanism 1, the object to be measured needs to go to the position of the air injection mechanism 2 for air injection operation. Specifically, the fourth accommodating chamber 211 in the second sealing cover 21 is used for isolating the measured area B from the external environment, and the gas transmission assembly 22 delivers the specific gas into the fourth accommodating chamber 211, so that the pressure in the fourth accommodating chamber 211 is greater than the pressure in the external environment. If the detected region B is in a gas leakage state, the specific gas enters the detected region B. And then separating the gas injection mechanism 2 from the measured object 3, and moving the measured object 3 to the position of the gas extraction detection mechanism 1 to detect the content of the specific gas and judge whether the measured area B leaks gas. The size and shape of the second sealing cover 21 are determined according to actual conditions, and may be the same as or different from the structure of the first sealing cover 11, which is not limited in the embodiments of the present application.

It can be understood that before the gas transmission assembly 22 delivers the specific gas to the fourth accommodating cavity 211, the fourth accommodating cavity 211 may be vacuumized in advance to absorb the initial air in the fourth accommodating cavity 211, so that after the gas transmission assembly 22 operates, only the specific gas is filled in the fourth accommodating cavity 211, thereby improving the accuracy of subsequent detection.

The gas tightness detection device of the embodiment of the application comprises a gas injection mechanism 2 besides a gas extraction detection mechanism 1, wherein the gas injection mechanism 2 firstly conveys specific gas around a detected area B, then the gas extraction detection mechanism 1 detects the content of the specific gas around the detected area B, and judges whether the detected area B leaks gas or not. The gas injection mechanism 2 is matched with the gas extraction detection mechanism 1 for use, so that the accurate and strict detection result is ensured.

In a second aspect, referring to fig. 7 and 8, an embodiment of the present application provides an air tightness detecting device for a battery cell, including a battery cell and the air tightness detecting device of any of the foregoing embodiments, the battery cell includes a housing 31, an electrode assembly, and an end cap assembly 32, where the electrode assembly is not shown in the drawings.

The case 31 is a hollow structure having a housing portion in which the electrode assembly is disposed, and the cap assembly 32 covers one end of the case 31 in the first direction X, and includes a liquid inlet 321 that penetrates the case in the first direction X, and a sealing member 322 for sealing the liquid inlet 321. Wherein the first seal cover 11 covers the seal 322.

The housing 31 is a hollow structure, and the end cap assembly 32 is disposed at one end of the housing 31 along a first direction X, which is a height direction of the battery cell. The cap assembly 32 is provided with electrode terminals, and the electrode assembly is disposed in the case 31 and electrically connected to the electrode terminals.

The housing 31 may have a hexahedral shape or other shapes. The case 31 has a receiving part formed therein to receive the electrode assembly and the electrolyte. The housing 31 may be made of a conductive metal material. Optionally, the housing 31 is made of aluminum or an aluminum alloy. When the single battery is installed, the electrode assembly is installed in the shell 31, then the end cap assembly 32 is fixed with the shell 31, electrolyte is injected through the electrolyte injection hole 321 in the end cap assembly 32, and after the electrolyte is injected, the electrolyte injection hole 321 is sealed by the sealing element 322.

In the embodiment of the present application, the object to be measured 3 is a single battery, and the area B to be measured is an area where the liquid injection hole 321 is located in the single battery. Illustratively, the specific gas is helium and the detection component 13 is a helium detector. Helium is a trace gas because it is a highly active gas molecule and easily escapes from a minute void. The gas tightness detection device is used after the battery monomer is manufactured, the gas injection mechanism transmits a certain amount of helium to the area around the liquid injection hole 321, and then the helium leakage value at the position of the liquid injection hole 321 is detected through the gas exhaust detection mechanism, so that whether the battery monomer leaks or not is judged.

The airtightness detection device provided by the embodiment of the application is used for detecting the airtightness at the position of the liquid injection hole 321 of the single battery cell and judging whether the single battery cell has a leakage phenomenon. The design has the advantages that helium does not need to be injected into the liquid injection hole 321 in advance when the single battery is manufactured, the airtightness detection device does not damage the shell 31 of the single battery, and the reliability is high.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not depart from the spirit of the embodiments of the present application, and they should be construed as being included in the scope of the claims and description of the present application. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. The air tightness detection device is characterized by comprising an air exhaust detection mechanism, wherein the air exhaust detection mechanism can carry out vacuum treatment on the periphery of a detected area in a detected object and detect the content of specific gas around the detected area; the bleed detection mechanism includes:

the first sealing cover covers the tested area and separates the tested area from the external environment;

the gas pumping assembly is connected to the first sealing cover and is used for pumping at least part of gas in the first sealing cover;

the detection assembly is connected with the first sealing cover and is used for detecting the content of the specific gas in the first sealing cover;

and the isolation assembly is arranged in the first sealing cover and can be positioned between the detected area and the air exhaust assembly so as to isolate the detected area from the air exhaust assembly.

2. The airtightness detection apparatus according to claim 1, wherein the first sealing cover is located on a side of the region to be detected, which is away from the object to be detected, and covers the region to be detected.

3. The airtightness detection apparatus according to claim 2, wherein the first sealing cover has a first accommodation chamber and a second accommodation chamber, the region to be detected is located in the first accommodation chamber, the air exhaust assembly is communicated with the second accommodation chamber, and the isolation assembly is located between the first accommodation chamber and the second accommodation chamber and is capable of controlling the first accommodation chamber to be communicated with or isolated from the second accommodation chamber.

4. The airtightness detection apparatus according to claim 3, wherein the volume ratio of the second receiving chamber to the first receiving chamber is A, wherein A ≧ 10.

5. The airtightness detection apparatus according to claim 1, wherein the first sealing cover is a hollow structure having an opening, the first sealing cover has a third accommodating cavity, the object to be tested is located in the third accommodating cavity, and the air suction assembly is communicated with the third accommodating cavity through the opening.

6. The apparatus according to claim 5, wherein the insulating member is located in the third receiving chamber and communicates with the opening.

7. The airtightness detection apparatus according to claim 1, wherein the isolation member comprises a solenoid valve and/or a flapper valve.

8. The airtightness detection apparatus according to claim 1, wherein the gas-extraction detection mechanism is further provided with a gas pipeline, the gas pipeline includes a main pipeline connected to the first sealing cover, and at least two branch pipelines communicated with the main pipeline, and the gas-extraction assembly and the detection assembly are respectively communicated with different branch pipelines.

9. The airtightness detection apparatus according to claim 1, further comprising an air injection mechanism capable of supplying the specific gas around the region under test, the air injection mechanism including:

the second sealing cover is provided with a fourth accommodating cavity, and the region to be measured is positioned in the fourth accommodating cavity;

a gas transmission assembly for transmitting the specific gas to the periphery of the tested area through the fourth containing cavity.

10. An airtightness detection apparatus for a battery cell, comprising a battery cell and the airtightness detection apparatus according to any one of claims 1 to 9, the battery cell comprising:

a housing having a hollow structure body of an accommodating portion;

an electrode assembly disposed in the receiving part;

the end cover assembly is covered at one end of the shell along the first direction and comprises a liquid injection hole penetrating through the end cover assembly along the first direction and a sealing element for sealing the liquid injection hole;

wherein the first seal cap covers the seal.