CN216524602U - Airtightness detection device and airtightness detection device for single battery - Google Patents
Airtightness detection device and airtightness detection device for single battery Download PDFInfo
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- CN216524602U CN216524602U CN202122639962.XU CN202122639962U CN216524602U CN 216524602 U CN216524602 U CN 216524602U CN 202122639962 U CN202122639962 U CN 202122639962U CN 216524602 U CN216524602 U CN 216524602U
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Abstract
The application provides a gas tightness detection device and battery monomer are with gas tightness detection device, gas tightness detection device is including the detection mechanism that bleeds, and the detection mechanism that bleeds includes first sealed cowling, subassembly, determine module and shielding piece. The first sealing cover is provided with a first accommodating cavity, and the detected area is located in the first accommodating cavity. The air exhaust assembly is connected to the first sealing cover and can exhaust the first gas in the accommodating cavity, and the detection assembly is connected to the first sealing cover and can detect the specific gas content in the first accommodating cavity. The shielding piece is located the first accommodation chamber and can float the setting above the region under test, and under the state of bleeding, shielding piece can move to the region under test to the protection region under test. The embodiment of the application utilizes the first chamber that holds to be detected regional isolated with external environment, then through evacuation operation and gas detection operation, realizes the detection to being detected regional gas tightness.
Description
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 the electric vehicle becomes an important component 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.
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 detect the content of specific gas around a detected area; the air exhaust detection mechanism comprises a first sealing cover, an air exhaust assembly, a detection assembly and a shielding piece.
The first sealing cover is provided with a first accommodating cavity, and the area to be measured is located in the first accommodating cavity. The air exhaust assembly is connected with the first sealing cover and can exhaust the first gas in the accommodating cavity, and the detection assembly is connected with the first sealing cover and can detect the content of the specific gas in the first accommodating cavity. The shielding piece is located in the first accommodating cavity and can be arranged above the detected area in a floating mode, and under the air exhaust state, the shielding piece can move to the detected area to protect the detected area.
The embodiment of the application utilizes the first chamber that holds to be detected regional isolated with external environment, then through evacuation operation and gas detection operation, realizes the detection to being detected regional gas tightness. Wherein first holding the intracavity and still being provided with the shielding piece for when the evacuation operation, the gaseous environment that will be surveyed the region and hold the intracavity with first is isolated, avoids pumping the subassembly and will be surveyed the regional specific gas and take out, thereby improves the accuracy of testing result.
In some embodiments, the suction detection mechanism further includes a driving assembly, the driving assembly is connected to the shielding member and at least partially extends out of the first sealing cover, and can drive the shielding member to approach or be far away from the detected region.
The air exhaust detection mechanism in the embodiment of the application is also provided with a driving assembly for driving the shielding piece to move, and the shielding piece is driven to ascend or descend in a manual or automatic control mode, so that the shielding piece is close to or far away from a detected area, and the operation is simple and reliable.
In some embodiments, the driving assembly includes a driving member and a connecting rod, the driving member drives the shielding member to move via the connecting rod, the first sealing cover has a through hole communicated with the first accommodating cavity, and the connecting rod and the through hole are slidably and hermetically disposed.
The embodiment of the application realizes the automatic control over the movement of the shielding piece through the driving piece, so that the detection efficiency of the air exhaust detection mechanism can be improved, and the effect of saving manpower is achieved. In addition, the through hole on the connecting rod and the first sealing cover is arranged in a sliding and sealing mode, so that gas in the external environment can not enter the first accommodating cavity through the through hole, the external environment is prevented from influencing the detection result, and the detection precision of the air exhaust detection mechanism is further improved.
In some embodiments, the side of the shield facing away from the measured area is shape-matched to the inside of the first sealing cap to enable the shield to make sealing contact with the first sealing cap.
One side that shielding piece deviates from the measured area in this application embodiment matches with the inboard shape of first sealed cowling to make shielding piece can shelter from the through-hole completely when the detection mechanism that bleeds is in gas detection operation, further avoid the air in the external environment to enter into to first holding the intracavity through the through-hole, and then improve and detect the precision.
In some embodiments, the gas exhaust detection mechanism is further provided with a gas pipeline, the gas pipeline comprises a main pipeline communicated with the first accommodating cavity 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 holding the chamber in the embodiment of this application only through a gas pipeline can realize with pumping assembly and determine module's intercommunication respectively, this kind of design only need set up one be used for with the air vent of gas pipeline intercommunication on first sealed cowling, 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 holding the intracavity through gas pipeline.
In some embodiments, the gas tightness detection device further comprises a gas injection mechanism, the gas injection mechanism is capable of delivering specific gas around the measured area, the gas outlet mechanism comprises a second sealing cover and a gas transmission assembly, the second sealing cover is provided with a second accommodating cavity, the measured area is located in the second accommodating cavity, and the gas transmission assembly delivers the specific gas around the measured area through the second accommodating cavity.
The gas tightness detection device of this application embodiment is including extracting gas detection device, 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 device 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 seal is located in the first receiving cavity.
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.
In some embodiments, the first sealing cover is disposed on a side of the end cap assembly facing away from the housing and is a hollow structure with an opening at one end, the opening is directed toward the sealing member, and an orthographic projection of the opening on the end cap assembly is located in the end cap assembly.
The gas tightness detection device in the embodiment of the application can locally detect the position of the liquid injection hole in the single battery, the size of the first sealing cover corresponds to the size of the liquid injection hole, the size of the first sealing cover can be reduced through the design, and the material cost of the gas tightness detection device is reduced.
In some embodiments, the first receiving chamber has a volume V, wherein 0.01ml ≦ V ≦ 10 ml.
The volume of the first accommodating cavity is limited within 0.01 ml-10 ml, the detection result is ensured to be safe and reliable, gas in the first accommodating cavity can be pumped out more easily, and the energy consumption of the air pumping assembly is reduced.
In some embodiments, the battery cell is located in the first receiving cavity, the shield is located on a side of the sealing member facing away from the housing in the first direction, and the shield covers the sealing member in an orthographic projection of the end cap assembly.
The air tightness detection device in the embodiment of the application is suitable for being used in the situation that the local detection can not be carried out on the liquid injection hole, at the moment, the first sealing cover is arranged around the periphery of the whole battery monomer, and the whole structure of the battery monomer including the liquid injection hole is detected.
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 an enlarged view of the region P shown in FIG. 3;
FIG. 5 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. 6 is a schematic structural diagram of a gas injection mechanism in the gas tightness detection device according to the embodiment of the present application;
FIG. 7 is an enlarged view of the structure of region R of FIG. 6;
fig. 8 is a schematic structural diagram of an air tightness detection device for a battery cell according to an embodiment of the present application;
FIG. 9 is an enlarged view of the structure of the region S shown in FIG. 8;
fig. 10 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. 11 is a schematic structural diagram of another gas injection mechanism in the gas tightness detection device provided in the embodiment of the present application.
In the drawings:
an air extraction detection mechanism 1; a first seal cap 11; the first accommodation chamber 111; a through-hole 1111; an opening 112; an air extraction assembly 12; a detection assembly 13; a shield 14; a drive assembly 15; a connecting rod 151; a gas pipe 16; a main conduit 161; a branch duct 162;
a gas injection mechanism 2; a second seal cap 21; the second accommodation chamber 211; a gas delivery assembly 22;
a measured object 3; a housing 31; an end cap assembly 32; a liquid injection hole 321; a seal 322;
a detected area A; a first direction X.
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; either directly or indirectly through intervening media, either internally or in any other relationship. The 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, referring to fig. 1 to 2, fig. 1 is a schematic structural view of an air-out detection mechanism in an air-tightness detection device according to an embodiment of the present application, and fig. 2 is a partially enlarged view of a region Q in fig. 1, the air-tightness detection device includes the air-out detection mechanism 1, and the air-out detection mechanism 1 can detect the content of a specific gas around a detected region a; the suction detection mechanism 1 includes a first seal cover 11, a suction assembly 12, a detection assembly 13, and a shielding member 14.
The first seal cover 11 has a first accommodation chamber 111, and the region a to be measured is located in the first accommodation chamber 111. The gas-extracting assembly 12 is connected to the first sealing cover 11 to extract the gas in the first accommodating cavity 111, and the detecting assembly 13 is connected to the first sealing cover 11 to detect the specific gas content in the first accommodating cavity 111. The shielding member 14 is located in the first accommodating cavity 111 and is arranged above the measured area a in a floating manner, and in an air-extracting state, the shielding member 14 can move to the measured area a to protect the measured area a.
The first sealing cover 11 is a hollow structure and separably contacts with the object to be measured 3, a first accommodating cavity 111 is formed inside the first sealing cover 11, the area a to be measured of the object to be measured 3 is exposed in the first accommodating cavity 111, and the first accommodating cavity 111 is used for isolating the area a to be measured from the external environment. The shape and structure of the first sealing cover 11 may be determined according to the size and shape of the object to be measured 3 or the area to be measured a, and may be square, arc, or other irregular shapes, which is not limited in this embodiment of the present application.
The air exhaust assembly 12 is communicated with the first sealing cover 11 through a pipeline or the like, and is used for exhausting the gas initially existing in the first accommodating cavity 111, that is, exhausting the gas in the first accommodating cavity 111, so that a vacuum state is formed in the first accommodating cavity 111.
The detection component 13 is communicated with the first sealing cover 11 through a pipeline and the like, and is used for detecting the content of the specific gas in the first accommodating cavity 111. Specifically, when the air extraction detection mechanism 1 works, firstly, the air extraction component 12 is used for pre-vacuumizing the first accommodating cavity 111, the object to be detected 3 and the air extraction detection mechanism 1 are subjected to standing treatment after the vacuum treatment is finished, the detection component 13 works after the standing treatment is carried out for a period of time, and if the sealing condition of the detected area a is good, the detection component 13 cannot detect the existence of specific gas in the first accommodating cavity 111; if the detected area a is in a gas leakage state, the specific gas inside the detected area a will escape into the first accommodating cavity 111, and the detecting component 13 can detect the existence of the specific gas in the first accommodating cavity 111. Therefore, whether the detected area A is air-leakage or not can be judged through the specific gas content detected by the detection component 13.
In the embodiment of the present application, a relatively movable shielding element 14 is further disposed in the first accommodating cavity 111, the shielding element 14 is located above the measured area a, and an orthographic projection of the shielding element 14 on the measured area a can cover an area of the measured area a. When the air exhaust assembly 12 performs vacuum-pumping treatment in the first accommodating cavity 111, the detected area a is covered by the control shielding piece 14, so that the detected area a is isolated from the gas environment in the first accommodating cavity 111, a protection effect is formed, and the subsequent detection precision of the detection assembly 13 is prevented from being affected. Specifically, if the area a is in a gas leakage state, the air pumping assembly 12 pumps the gas in the first accommodating cavity 111 and also pumps the specific gas in the area a, so that when the subsequent detection assembly 13 is operated, even if the area a is in a gas leakage state, the detection assembly 13 cannot detect the specific gas, and thus an erroneous detection result is easily obtained. The shielding piece 14 isolates the area a to be detected from the gas environment in the first accommodating cavity 111, so that the gas pumping assembly 12 can only pump the gas in the first accommodating cavity 111 away, and cannot pump the gas in the area a to be detected away, thereby improving the final detection precision.
The embodiment of the application utilizes first chamber 111 that holds to be detected regional A and external environment isolated, then through evacuation operation and gas detection operation, realizes the detection to being detected regional A gas tightness. The first accommodating cavity 111 is further provided with a shielding piece 14 for isolating the detected area a from the gas environment in the first accommodating cavity 111 during the vacuum-pumping operation, so that the air pumping assembly 12 is prevented from pumping out the specific gas in the detected area a, and the accuracy of the detection result is improved.
Referring to fig. 1 and 2, in some embodiments, the suction detection mechanism 1 further includes a driving assembly 15, and the driving assembly 15 is connected to the shielding member 14 and at least partially extends out of the first sealing cover 11, and can drive the shielding member 14 to approach or depart from the detected area a.
The driving assembly 15 is located on a side of the shield 14 facing away from the area a to be measured and is directly connected to the shield 14 for driving the shield 14 to approach or move away from the area a to be measured. At least part of the drive assembly 15 extends out of the first sealing cap 11 and the shield 14 is connected to the exterior of the first sealing cap 11 by the drive assembly 15. The drive assembly 15 is able to slide relative to the first sealing cap 11, thereby causing the shutter 14 to rise or fall. The driving assembly 15 can control the movement of the shielding member 14 in a manual control manner, and can also realize the movement of the shielding member 14 in an automatic control manner, which is not limited in the embodiment of the present application.
The air suction detection mechanism 1 in the embodiment of the present application is further provided with a driving assembly 15 for driving the shielding member 14 to move, and the shielding member 14 is driven to ascend or descend in a manual or automatic control manner, so that the shielding member 14 is close to or far away from the detected area a, and the operation is simple and reliable.
In some embodiments, the driving assembly 15 includes a driving member and a connecting rod 151, the driving member is not shown in the drawings, the driving member drives the shielding member 14 to move via the connecting rod 151, the first sealing cover 11 has a through hole 1111 communicating with the first accommodating cavity 111, and the connecting rod 151 slides and is hermetically disposed with the through hole 1111.
The driving member provides power for the movement of the shielding member 14, and realizes automatic control of the movement of the shielding member 14, and the driving member includes but is not limited to a cylinder or a servo motor. The connecting rod 151 moves in synchronization with the shutter 14 to perform a motion transfer function, and the connecting rod 151 is disposed in the through hole 1111, wherein the cross-sectional shape of the connecting rod 151 may be the same as or different from that of the through hole 1111. The connecting rod 151 and the through hole 1111 are slidably and hermetically disposed, for example, a shaft sleeve is fixed on the through hole 1111, the connecting rod 151 is disposed in the shaft sleeve and can slide in the shaft sleeve, and a sealing ring is disposed between the shaft sleeve and the connecting rod 151, so that when the connecting rod 151 slides relative to the shaft sleeve, a sealing state is maintained between the connecting rod 151 and the shaft sleeve.
This application embodiment realizes the automatic control to the removal of shielding piece 14 through the driving piece to can improve the detection efficiency of the detection mechanism 1 of bleeding, reach the effect of practicing thrift the manpower. In addition, the connecting rod 151 and the through hole 1111 of the first sealing cover 11 are slidably and hermetically arranged, so that gas in the external environment can not enter the first accommodating cavity 111 through the through hole 1111, the external environment is prevented from influencing the detection result, and the detection precision of the air exhaust detection mechanism 1 is further improved.
Referring to fig. 3 and 4, in some embodiments, the side of the shielding member 14 facing away from the measured area a matches the shape of the inner side of the first sealing cap 11, so that the shielding member 14 can be in sealing contact with the first sealing cap 11.
The side of the shield 14 away from the measured area a is the upper side of the shield 14, and the upper side of the shield 14 matches with the inner side of the first sealing cover 11 in shape. After the vacuumizing operation is completed, the shielding piece 14 starts to be away from the measured area a and gradually rises until the shielding piece rises to be in contact with the first sealing cover 11, at the moment, the shielding piece 14 can completely shield the through hole 1111 and realize sealing contact with the first sealing cover 11, and air in the external environment is further prevented from entering the first accommodating cavity 111 through the through hole 1111. Optionally, as shown in fig. 4, the side of the shielding element 14 away from the measured area a and the side of the first sealing cover 11 facing the shielding element 14 are both arc-shaped structures, so that the shielding element 14 and the first sealing cover 11 can be tightly attached.
One side of the shielding piece 14 departing from the detected area a in the embodiment of the present application matches with the inside shape of the first sealing cover 11, so that the shielding piece 14 can completely shield the through hole 1111 when the air suction detection mechanism 1 is in the gas detection operation, and further, the air in the external environment is prevented from entering the first accommodating cavity 111 through the through hole 1111, and the detection precision is further improved.
Referring to fig. 5, in some embodiments, the gas exhaust detection mechanism 1 further includes a gas pipe 16, the gas pipe 16 includes a main pipe 161 communicating with the first accommodating cavity 111 and at least two branch pipes 162 communicating with the main pipe 161, and the gas exhaust assembly 12 and the detection assembly 13 are respectively communicated with the different branch pipes 162.
The gas pumping assembly 12 and the detecting assembly 13 are both communicated with the first accommodating cavity 111 through a gas pipeline 16, wherein the gas pipeline 16 comprises a main pipeline 161 and at least two branch pipelines 162 communicated with the main pipeline 161. When the pumping detection mechanism 1 is in the vacuum pumping operation, the pumping assembly 12 operates, and the gas in the first accommodating cavity 111 enters the branch pipeline communicated with the pumping assembly 12 through the main pipeline 161, 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 assembly 13 works, if the detected region a leaks air, specific gas leaks from the detected region a to reach the first accommodating cavity 111, enters the branch pipeline communicated with the detection assembly 13 through the main pipeline 161, and is finally detected by the detection assembly 13. Optionally, control valves are further disposed on different branch pipes 162, and are used for respectively controlling the communication between the air pumping assembly 12 and the first accommodating cavity 111, and the detection assembly 13. Specifically, when the evacuation detection mechanism 1 is in the evacuation operation, the valve on the branch pipe 162 communicated with the detection assembly 13 is closed, the valve on the branch pipe 162 communicated with the evacuation assembly 12 is opened, and the evacuation assembly 12 is communicated with the first accommodation chamber 111 and evacuates the gas in the first accommodation chamber 111; when the gas exhaust detection mechanism 1 is in gas detection operation, the valve on the branch pipe 162 communicated with the gas exhaust assembly 12 is closed, the valve on the branch pipe 162 communicated with the detection assembly 13 is opened, the detection assembly 13 is communicated with the first accommodating cavity 111, and the content of the specific gas in the first accommodating cavity 111 is detected.
Referring to fig. 6 and 7, in some embodiments, the gas tightness detecting apparatus further includes a gas injection mechanism 2, the gas injection mechanism 2 is capable of delivering a specific gas around the measured area a, the gas discharge mechanism includes a second sealing cap 21 and a gas transmission assembly 22, the second sealing cap 21 has a second accommodating cavity 211, the measured area a is located in the second accommodating cavity 211, and the gas transmission assembly 22 delivers the specific gas around the measured area a through the second accommodating cavity 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 second accommodating chamber 211 in the second sealing cover 21 is used for isolating the measured area a from the external environment, and the gas transmission assembly 22 delivers the specific gas into the second accommodating chamber 211, so that the pressure in the second accommodating chamber 211 is greater than the pressure in the external environment. If the area A is in a gas leakage state, the specific gas enters into the area A. 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 A 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 second accommodating cavity 211, the second accommodating cavity 211 may be vacuumized in advance to absorb the initial air in the second accommodating cavity 211, so that after the gas transmission assembly 22 operates, only the specific gas is filled in the second accommodating cavity 211, thereby improving the accuracy of subsequent detection.
The gas tightness detection device of this application embodiment is including extracting gas detection mechanism, still including gas injection mechanism 2, and gas injection mechanism 2 is earlier to being carried specific gas around regional A detected, then extracts gas detection mechanism and is detecting the specific gas content around regional A detected, judges regional A detected whether exist gas leakage. The gas injection mechanism 2 is matched with the gas extraction detection mechanism for use, so that the accurate and precise detection result is ensured.
Referring to fig. 8 and 9, in another aspect, 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 case 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 sealing member 322 is located in the first receiving chamber 111.
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 material of conductive metal. 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 measured area is an area where the liquid injection hole 321 is located. Illustratively, the particular gas is helium and the detection component 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 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 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.
Referring to fig. 8 and 9, in some embodiments, the first sealing cover 11 is disposed on a side of the end cap assembly 32 facing away from the housing 31 and is a hollow structure with an opening 112 at one end, the opening 112 is directed toward the sealing member 322, and an orthographic projection of the opening 112 on the end cap assembly 32 is located in the end cap assembly 32.
The first seal cover 11 is located on the side, away from the shell 31, of the end cover assembly 32 along the first direction X, and during gas detection operation, the first seal cover 11 is attached to the end cover assembly 32, the opening 112 faces the end cover assembly 32, and the sealing element 322 is exposed in the first accommodating cavity 111, wherein the size of the opening 112 is positively correlated with the size of the liquid injection hole 321, that is, the size of the first seal cover 11 is set according to the size of the liquid injection hole 321
The air tightness detection device in the embodiment of the application can locally detect the position of the liquid injection hole 321 in the single battery, the size of the first sealing cover 11 corresponds to the size of the liquid injection hole 321, and the design can reduce the size of the first sealing cover 11 and reduce the material cost of the air tightness detection device.
In some embodiments, the volume of the first receiving chamber 111 is V, where 0.01ml ≦ V ≦ 10 ml.
As can be seen from the above, the air tightness detecting device in the embodiment of the present application can locally detect the position of the liquid injection hole 321 in the battery cell. In this case, the volume inside the first housing cavity 111 is small, so that the area that can be detected by the detection assembly 13 is small, and therefore less susceptible to interference from other factors. In addition, the pressure in the first accommodating cavity 111 is required to be below 40Pa during detection, so that the difficulty of vacuum operation can be reduced due to the small volume of the first accommodating cavity 111, and the energy consumption of the air exhaust assembly 12 is reduced.
The volume of the first accommodating cavity 111 is limited within 0.01 ml-10 ml, so that the detection result is safe and reliable, the gas in the first accommodating cavity 111 can be pumped out more easily, and the energy consumption of the air pumping assembly 12 is reduced.
Referring to fig. 10, in some embodiments, the battery cell is located in the first accommodating cavity 111, the shielding member 14 is located on a side of the sealing member 322 facing away from the housing 31 along the first direction X, and an orthographic projection of the shielding member 14 on the end cap assembly 32 covers the sealing member 322.
The airtightness detection device in the embodiment of the present application is suitable for use in a case where the liquid injection hole 321 cannot be detected locally, and at this time, the first sealing cap 11 is disposed around the entire periphery of the battery cell, and detects the entire structure of the battery cell including the liquid injection hole 321. Optionally, the first sealing cover 11 includes an upper cover body and a lower cover body that are detachably connected, and when in use, the battery cell is first placed in the lower cover body, and then the upper cover body and the lower cover body are fixedly sealed, so as to form a first accommodating cavity 111 that can accommodate the battery cell.
It should be understood that, referring to fig. 11, the second sealing cap 21 in the gas injection mechanism may have the same structure as the first sealing cap 11 in the embodiment of the present application, that is, in the gas injection process, the second sealing cap 21 surrounds the entire periphery of the battery cell, and the battery cell is located in the second accommodating cavity 211, which is not described in detail in the embodiment of the present application.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit 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; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. 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 rather to cover all embodiments falling within the scope of the appended claims.
Claims (10)
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 and detect the specific gas content of the periphery of the detected area; the bleed detection mechanism includes:
the first sealing cover is provided with a first accommodating cavity, and the area to be measured is positioned in the first accommodating cavity;
the air exhaust assembly is connected to the first sealing cover and can exhaust air in the first accommodating cavity;
the detection assembly is connected to the first sealing cover and can detect the content of the specific gas in the first accommodating cavity;
the shielding piece is positioned in the first accommodating cavity and can be arranged above the detected area in a floating mode, and the shielding piece can move to the detected area under the air exhaust state so as to protect the detected area.
2. The airtightness detection apparatus according to claim 1, wherein the evacuation detection mechanism further comprises a driving assembly, the driving assembly is connected to the shielding member and at least partially extends out of the first sealing cover, and can drive the shielding member to approach or move away from the detected region.
3. The airtightness detection apparatus according to claim 2, wherein the driving assembly includes a driving member and a connecting rod, the driving member drives the shielding member to move via the connecting rod, the first sealing cover has a through hole communicating with the first accommodating cavity, and the connecting rod and the through hole are slidably and hermetically disposed.
4. The airtightness detection apparatus according to claim 2, wherein a side of the shield facing away from the region to be detected is shape-matched with an inner side of the first sealing cap so that the shield can be brought into sealing contact with the first sealing cap.
5. 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 communicated with the first accommodating cavity, 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.
6. The airtightness detection apparatus according to any one of claims 1 to 5, further comprising an air injection mechanism capable of supplying a specific gas around the region under test, the air injection mechanism including:
the second sealing cover is provided with a second containing cavity, and the area to be measured is positioned in the second containing cavity;
a gas transmission assembly for transmitting the specific gas to the periphery of the tested area through the second containing cavity.
7. 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 6, the battery cell comprising:
a housing having a hollow structure body of an accommodating portion;
an electrode assembly disposed within 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 seal is located in the first receiving cavity.
8. The airtightness detection apparatus according to claim 7, wherein the first sealing cover is disposed on a side of the end cap assembly facing away from the housing and is a hollow structure with an opening at one end, the opening is directed toward the sealing member, and an orthographic projection of the opening on the end cap assembly is located in the end cap assembly.
9. The airtightness detection apparatus according to claim 8, wherein the volume of the first accommodation chamber is V, wherein V is 0.01 ml. ltoreq. V.ltoreq.10 ml.
10. The gas tightness detection device according to claim 7, wherein the battery cell is located in the first accommodating cavity, the shielding member is located on a side of the sealing member facing away from the housing along the first direction, and an orthographic projection of the shielding member on the end cap assembly covers the sealing member.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117168712A (en) * | 2023-11-03 | 2023-12-05 | 宁德时代新能源科技股份有限公司 | Detection assembly, detection equipment and detection method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117168712A (en) * | 2023-11-03 | 2023-12-05 | 宁德时代新能源科技股份有限公司 | Detection assembly, detection equipment and detection method thereof |
| CN117168712B (en) * | 2023-11-03 | 2024-04-02 | 宁德时代新能源科技股份有限公司 | Detection assembly, detection equipment and detection method thereof |
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