CN221425888U - Air tightness detection device - Google Patents

Abstract

The application provides an air tightness detection device, which comprises a base frame, an upper cavity shell, a lower cavity shell, a transfer mechanism, a detected gas pumping and injecting connecting mechanism, an air leakage detection mechanism and a vacuum connecting mechanism, wherein the transfer mechanism drives the lower cavity shell to move between a closed position and an open position; when the lower cavity shell is positioned at the closed position, a closed accommodating cavity is formed between the lower cavity shell and the upper cavity shell; the air outlet end of the tested gas pumping and injecting connecting mechanism is detachably in butt joint communication with the air injection port on the product to be tested, and the air inlet end of the tested gas pumping and injecting connecting mechanism is communicated with an external tested gas supply air passage, an air passage for vacuumizing the product to be tested and an air passage for breaking vacuum of the product to be tested; the air leakage detection mechanism is communicated into the accommodating cavity; the suction end of the vacuum connecting mechanism is communicated into the accommodating cavity, and the discharge end of the vacuum connecting mechanism is communicated with an external air path for vacuumizing the accommodating cavity and an external air path for breaking the vacuum of the accommodating cavity.

Description

Air tightness detection device

Technical Field

The application relates to the technical field of lithium battery detection, in particular to an air tightness detection device.

Background

With the rapid development of new energy, lithium batteries are increasingly used. The tightness of the lithium battery directly determines the safety performance of the lithium battery, and if the lithium battery is poorly sealed, dangerous accidents such as electrolyte leakage, shell expansion, fire explosion and the like can be caused, so that great danger and loss are brought to battery enterprises and consumers. Therefore, the accuracy and necessity of the air tightness detection of the lithium battery will be of great importance.

At present, the tightness detection of the lithium battery mostly utilizes the permeability of helium, and the helium is injected into the lithium battery through a lithium battery helium detection device and is detected whether the helium leaks out, so that the tightness of the lithium battery is detected.

However, the existing lithium battery helium detection equipment has extremely complex structure, high manufacturing cost and extremely high use and maintenance cost. Moreover, the detection operation is complicated, the detection efficiency is low, the unstable pressure maintaining effect is easy to occur in the detection process, and the problem of inaccurate and unstable detection results is caused. Moreover, the conventional lithium battery helium detection equipment mainly comprises a conventional lithium battery, has poor compatibility, cannot be compatible with a blade lithium battery, and is difficult to meet detection requirements.

Therefore, there is a strong need for an airtight testing apparatus to overcome the above-mentioned problems.

Disclosure of utility model

The embodiment of the application aims to provide an air tightness detection device which has the advantages of simple structure, low manufacturing cost, low use and maintenance cost, simple and convenient detection operation, high detection efficiency, accurate and stable detection result and strong compatibility.

To achieve the above object, a first aspect of an embodiment of the present application provides an air tightness detection device, which is suitable for detecting air tightness of a product to be detected, wherein the air tightness detection device includes: the device comprises a base frame, an upper cavity shell, a lower cavity shell, a transfer mechanism, a tested gas pumping and injecting connecting mechanism, a gas leakage detecting mechanism and a vacuum connecting mechanism, wherein the upper cavity shell is fixed on the base frame, the lower cavity shell is movably arranged on the base frame, and the lower cavity shell is provided with a closed position sealed in the upper cavity shell and an open position far away from the upper cavity shell; the transfer mechanism is arranged on the base frame, the lower cavity shell is connected to the transfer mechanism in a transmission way, and the transfer mechanism drives the lower cavity shell to move between the closed position and the open position; when the lower cavity shell is positioned at the closed position, a closed accommodating cavity is formed between the lower cavity shell and the upper cavity shell; the gas pumping and injecting connecting mechanism is arranged on the base frame, the gas outlet end of the gas pumping and injecting connecting mechanism is sealed and stretches into the accommodating cavity, the gas outlet end of the gas pumping and injecting connecting mechanism is detachably in butt joint communication with the gas injection port on the product to be tested, and the gas inlet end of the gas pumping and injecting connecting mechanism is communicated with an external gas supply gas channel of the gas to be tested, a gas channel for vacuumizing the product to be tested and a gas channel for breaking vacuum of the product to be tested; the air leakage detection mechanism is arranged on the base frame and is communicated into the accommodating cavity; the vacuum connecting mechanism is arranged on the base frame, the suction end of the vacuum connecting mechanism is communicated with the accommodating cavity, and the discharge end of the vacuum connecting mechanism is communicated with an external air path for vacuumizing the accommodating cavity and an air path for breaking the vacuum of the accommodating cavity.

Optionally, an upper accommodating groove with a downward opening is formed on the upper cavity shell, a lower accommodating groove with a downward opening is formed on the lower cavity shell, and when the lower cavity shell is located at the closed position, the lower accommodating groove and the upper accommodating groove are closed to form the accommodating cavity.

Optionally, the gas pumping and injecting connection mechanism to be tested comprises: the device comprises a first linear driver and an air injection pipe, wherein the first linear driver is vertically fixed on a base frame, a driving shaft of the first linear driver is provided with a first air injection channel which vertically penetrates through the first linear driver, and the upper end of the first air injection channel is communicated with an external tested air supply air channel, an air channel for vacuumizing the product to be tested and an air channel for breaking vacuum of the product to be tested; the gas injection pipe is vertically fixedly connected to the lower end of the driving shaft of the first linear driver, the gas injection pipe is hermetically and slidably arranged on the top of the upper cavity shell in a penetrating manner and stretches into the upper accommodating groove, a vertically penetrating second gas injection channel is formed in the gas injection pipe, the upper end of the second gas injection channel is communicated with the lower end of the first gas injection channel, and the lower end of the gas injection pipe is detachably in butt joint communication with a gas injection port of a product to be tested.

Optionally, the gas pumping and injecting connection mechanism to be tested further comprises: the gas injection butt joint nozzle is fixedly sleeved at the lower end of the gas injection pipe.

Optionally, the vacuum connection mechanism includes: the vacuum connecting pipe is fixed on the base frame, the lower end of the vacuum connecting pipe is communicated with the upper accommodating groove, one end of the vacuum control valve is communicated with the upper end of the vacuum connecting pipe, and the other end of the vacuum control valve is communicated with an external air path for vacuumizing the accommodating cavity.

Optionally, the vacuum connection mechanism further comprises: the vacuum breaking control valve is characterized in that one end of the vacuum breaking control valve is communicated with the vacuum connecting pipe, and the other end of the vacuum breaking control valve is communicated with an external air path for breaking vacuum in the accommodating cavity.

Optionally, the air leakage detection mechanism includes: the detection connecting pipe is fixed on the base frame, the lower end of the detection connecting pipe is communicated with the upper accommodating groove, and the detection control valve is communicated between the upper end of the detection connecting pipe and the detector.

Optionally, the transfer mechanism includes: the translation plate is arranged on the base frame in a moving mode along the horizontal direction from the closed position to the open position, the translation driving assembly is arranged on the base frame, and the translation plate is connected to the translation driving assembly in a transmission mode; the lifting plate vertically moves on the translation plate, the lifting driving assembly is arranged on the translation plate, and the lifting plate is in transmission connection with the lifting driving assembly; the lower cavity shell is vertically fixed on the lifting plate.

Optionally, the translation driving assembly includes: the rotary driver is fixed on the base frame, the screw rod is pivoted on the base frame along the horizontal direction from the closed position to the open position, the screw rod is fixedly connected to the output end of the rotary driver, and the translation plate is in threaded connection with the screw rod;

The lift drive assembly includes: the second linear driver is vertically fixed on the translation plate, and the lifting plate is fixedly connected to the upper end of a driving shaft of the second linear driver;

The transfer mechanism further includes: the vertical position sensor and the horizontal position sensor are fixed on the base frame, the vertical position sensor is positioned at the closing position, and when the lower cavity shell moves to the closing position, the lower cavity shell triggers the vertical position sensor; the horizontal position sensor is positioned below the closed position, and when the translation plate moves to the position right below the closed position, the translation plate triggers the horizontal position sensor.

Optionally, the air tightness detection device further comprises: the filling block is fixed in the lower containing groove, and a containing groove for containing and positioning the product to be tested is formed in the filling block.

Because the upper cavity shell of the air tightness detection device is fixed on the base frame, the lower cavity shell is movably arranged on the base frame, and the lower cavity shell is provided with a closed position sealed on the upper cavity shell and an open position far away from the upper cavity shell; the transfer mechanism is arranged on the base frame, the lower cavity shell is connected to the transfer mechanism in a transmission way, and the transfer mechanism drives the lower cavity shell to move between a closed position and an open position; when the lower cavity shell is positioned at the closed position, a closed accommodating cavity is formed between the lower cavity shell and the upper cavity shell; the gas pumping and injecting connecting mechanism is arranged on the base frame, the gas outlet end of the gas pumping and injecting connecting mechanism extends into the accommodating cavity in a sealed mode, the gas outlet end of the gas pumping and injecting connecting mechanism is detachably in butt joint communication with the gas injection port on the product to be tested, and the gas inlet end of the gas pumping and injecting connecting mechanism is communicated with an external gas supply gas channel of the gas to be tested, a gas channel for vacuumizing the product to be tested and a gas channel for breaking the vacuum of the product to be tested; The air leakage detection mechanism is arranged on the base frame and is communicated into the accommodating cavity; the vacuum connecting mechanism is arranged on the base frame, the suction end of the vacuum connecting mechanism is communicated into the accommodating cavity, and the discharge end of the vacuum connecting mechanism is communicated with an external air path for vacuumizing the accommodating cavity and an external air path for breaking the vacuum of the accommodating cavity. When the lower cavity shell moves to an opening position, a product to be detected is placed in the lower cavity shell, the lower cavity shell is driven by the transfer mechanism to move to a closing position, so that the product to be detected is contained in the containing cavity, then the air outlet end of the gas pumping and injecting connecting mechanism to be detected is in butt joint communication with the air injection port on the product to be detected, and then an external air path for vacuumizing the containing cavity is used for vacuumizing the containing cavity to a preset vacuum value through the vacuum connecting mechanism and maintaining pressure; The external gas path for vacuumizing the product to be tested is used for vacuumizing the product to be tested to a preset vacuum value through the tested gas vacuumizing-injecting connecting mechanism, and then the external tested gas supply gas path is used for injecting the tested gas into the product to be tested through the tested gas vacuumizing-injecting connecting mechanism. Detecting whether the detected gas leaks from the accommodating cavity through the gas leakage detection mechanism, if the detected gas leaks from the accommodating cavity, the gas leakage detection mechanism detects that the detected gas does not leak from the accommodating cavity, the detected product does not have cracks or gaps, the tightness is good, and the detected product is qualified; if the air leakage detection mechanism detects that the containing cavity is provided with detected air leaking from the product to be detected, and the product to be detected is provided with cracks or gaps, the product to be detected is unqualified. After the detection is finished, the detected gas in the product to be detected is pumped away through the detected gas pumping and injecting connecting mechanism by an external detected gas supply gas circuit, and then the vacuum of the product to be detected is broken through the detected gas pumping and injecting connecting mechanism by an external gas circuit for breaking the vacuum of the product to be detected; simultaneously, the outer air circuit for breaking vacuum to the accommodating cavity breaks vacuum to the accommodating cavity through the vacuum connecting mechanism. And then the lower cavity shell is driven to move to the opening position by the transfer mechanism, so that the product to be tested can be taken out from the lower cavity shell. The structure is simpler, the manufacturing cost is greatly reduced, and the use and maintenance cost is lower. Moreover, the detection operation is simpler and more convenient, the detection efficiency is greatly improved, and the pressure maintaining effect is stable in the detection process, so that the detection result can be ensured to be accurate and stable. Moreover, through the switching cooperation structure of lower chamber casing and upper chamber casing, except can compatible detection conventional lithium cell, can also compatible detection blade lithium cell, the compatibility improves greatly, can better satisfy the detection demand.

Drawings

Fig. 1 is a combined perspective view of the air tightness detecting device of the present application.

Fig. 2 is a front view of the upper chamber housing, the lower chamber housing, and the gas pumping connection mechanism of the air tightness detection device of the present application.

Fig. 3 is a cross-sectional view taken along line A-A of fig. 2.

Detailed Description

The application will be further described with reference to the drawings and preferred embodiments, but the embodiments of the application are not limited thereto.

Referring to fig. 1 to 3, the air tightness detecting apparatus 100 of the present application is suitable for detecting air tightness of a product 200 to be tested, wherein the air tightness detecting apparatus 100 of the present application comprises: the device comprises a base frame 10, an upper cavity shell 20, a lower cavity shell 30, a transfer mechanism 40, a tested gas pumping and injecting connecting mechanism 50, a gas leakage detecting mechanism 60 and a vacuum connecting mechanism 70, wherein the upper cavity shell 20 is fixed on the base frame 10, the lower cavity shell 30 is movably arranged on the base frame 10, and the lower cavity shell 30 is provided with a closed position sealed on the upper cavity shell 20 and an open position far away from the upper cavity shell 20. The transfer mechanism 40 is disposed on the base frame 10, the lower chamber housing 30 is connected to the transfer mechanism 40 in a transmission manner, and the transfer mechanism 40 drives the lower chamber housing 30 to move between a closed position and an open position. When the lower chamber housing 30 is in the closed position, a closed accommodating chamber (not labeled in the figure) is formed between the lower chamber housing 30 and the upper chamber housing 20, and the product 200 to be measured is accommodated and positioned in the accommodating chamber. The gas pumping and injecting connecting mechanism 50 to be tested is arranged on the base frame 10, the gas outlet end of the gas pumping and injecting connecting mechanism 50 to be tested extends into the accommodating cavity in a sealed mode, the gas outlet end of the gas pumping and injecting connecting mechanism 50 to be tested is in detachable butt joint communication with the gas injection port 201 on the product 200 to be tested, and the gas inlet end of the gas pumping and injecting connecting mechanism 50 to be tested is communicated with an external gas supply gas path to be tested, a gas path for vacuumizing the product 200 to be tested and a gas path for breaking vacuum of the product 200 to be tested, so that the operations of pumping and injecting the gas to be tested, vacuumizing and breaking vacuum are performed on the product 200 to be tested. The air leakage detecting mechanism 60 is disposed on the base frame 10, and the air leakage detecting mechanism 60 is connected to the accommodating cavity to detect whether the detected air leaks into the accommodating cavity. The vacuum connection mechanism 70 is arranged on the base frame 10, the suction end of the vacuum connection mechanism 70 is communicated into the accommodating cavity, and the discharge end of the vacuum connection mechanism 70 is communicated with an external air path for vacuumizing the accommodating cavity and an external air path for breaking the accommodating cavity, so that vacuumizing and breaking operations are performed on the accommodating cavity. The air tightness detection device 100 of the application has simpler structure, greatly reduced manufacturing cost and lower use and maintenance cost. Moreover, the detection operation is simpler and more convenient, the detection efficiency is greatly improved, and the pressure maintaining effect is stable in the detection process, so that the detection result can be ensured to be accurate and stable. Moreover, through the switching cooperation structure of lower chamber casing 30 and upper chamber casing 20, except can compatible detection conventional lithium cell, can also compatible detection blade lithium cell, the compatibility improves greatly, can better satisfy the detection demand. Specifically, the following are:

Wherein, be formed with the last holding tank 21 of opening decurrent on the upper chamber casing 20, be formed with the lower holding tank 31 of opening decurrent on the lower chamber casing 30, when lower chamber casing 30 is located closed position, lower chamber casing 30 butt joint is closed in the bottom of upper chamber casing 20, the opening butt joint of lower holding tank 31 is closed in the opening with last holding tank 21, lower holding tank 31 and the closed formation holding cavity of last holding tank 21 for the formation structure of holding cavity is more simple reasonable. Preferably, in this implementation, still be provided with first sealing washer 91 at the top of lower chamber casing 30, through setting up first sealing washer 91 for lower chamber casing 30 butt joint is closed in the bottom of last chamber casing 20, and the leakproofness that holds the cavity is better, avoids appearing the condition of gas leakage, and the structure is more reasonable.

Meanwhile, the measured gas pumping and injecting connection mechanism 50 includes: the first linear driver 51 and the gas injection pipe 52, the first linear driver 51 is vertically fixed on the base frame 10, the first linear driver 51 may be an air cylinder, but not limited to this, a first gas injection channel 512 vertically penetrating is provided on the driving shaft 511 of the first linear driver 51, and the upper end of the first gas injection channel 512 is connected to an external gas supply channel of the gas to be tested, a gas channel for vacuumizing the product 200 to be tested, and a gas channel for breaking the vacuum of the product 200 to be tested. The gas injection pipe 52 is vertical fixed connection in the drive shaft 511 lower extreme of first linear drive 51, and the gas injection pipe 52 be airtight slip wear to arrange in the top of upper chamber casing 20 and stretch into in the upper holding tank 21, and better, in this implementation, still be provided with the second sealing washer 92 between gas injection pipe 52 and the upper chamber casing 20 for the slip wear to put complex leakproofness between gas injection pipe 52 and the upper chamber casing 20 is better, avoids appearing the condition of gas leakage, and the structure is more reasonable.

A second gas injection channel 521 is vertically formed in the gas injection pipe 52, the upper end of the second gas injection channel 521 is communicated with the lower end of the first gas injection channel 512, and the lower end of the gas injection pipe 52 is detachably connected with the gas injection port 201 of the product 200 to be tested. The matching structure that the air outlet end of the tested air pumping and injecting connecting mechanism 50 is detachably connected with the air injection port 201 on the product 200 to be tested in a butt joint mode can be realized.

Preferably, the gas pumping and injecting connection mechanism 50 further comprises: the gas injection butt joint mouth 53, the fixed cover of gas injection butt joint mouth 53 locates the lower extreme of gas injection pipe 52. The gas injection butt joint nozzle 53 is made of a silica gel material, so as to ensure more airtight butt joint between the gas injection pipe 52 and the gas injection port 201 of the product 200 to be tested, avoid the condition of gas leakage to influence the detection result, and have a more reasonable structure.

Further, the vacuum connection mechanism 70 includes: the vacuum connecting pipe 71 and the vacuum control valve 72, the vacuum connecting pipe 71 is fixed on the base frame 10, the lower end of the vacuum connecting pipe 71 is communicated with the upper accommodating groove 21, one end of the vacuum control valve 72 is communicated with the upper end of the vacuum connecting pipe 71, and the other end of the vacuum control valve 72 is communicated with an external air path for vacuumizing the accommodating cavity. Therefore, the on-off operation of the air path for vacuumizing the accommodating cavity can be controlled through the vacuumizing control valve 72, so that the accommodating cavity is vacuumized, and the use is more convenient and simple.

Furthermore, the vacuum connection mechanism 70 further includes: one end of the vacuum breaking control valve 73 is communicated with the vacuum connecting pipe 71, and the other end of the vacuum breaking control valve 73 is communicated with an external air path for breaking vacuum in the accommodating cavity. Therefore, the on-off operation of the air path for carrying out vacuum breaking on the accommodating cavity can be controlled through the vacuum breaking control valve 73, so that the accommodating cavity is subjected to vacuum breaking, and the use is more convenient and simple.

Further, the air leakage detecting mechanism 60 includes: the detection connecting pipe 61, the detection control valve 62 and the detector (not shown in the figure), the detection connecting pipe 61 is fixed on the base frame 10, the lower end of the detection connecting pipe 61 is communicated with the upper accommodating groove 21, and the detection control valve 62 is communicated between the upper end of the detection connecting pipe 61 and the detector. The connection or disconnection of the detector and the accommodating cavity can be realized by operating the detection control valve 62, so that the detector can conveniently detect whether the detected gas leaks in the accommodating cavity.

Further, the transfer mechanism 40 includes: in this embodiment, the open position is located at one side of the closed position, so as to facilitate the feeding and discharging operation of the product 200 to be tested, the translation plate 41 is movably disposed on the base frame 10 along the horizontal direction from the closed position to the open position, the translation driving assembly 42 is disposed on the base frame 10, the translation plate 41 is in transmission connection with the translation driving assembly 42, and the translation driving assembly 42 drives the translation plate 41 to reciprocate along the horizontal direction from the closed position to the open position. The lifting plate 43 vertically moves on the translation plate 41, the lifting driving assembly 44 is arranged on the translation plate 41, and the lifting plate 43 is in transmission connection with the lifting driving assembly 44; the lower chamber housing 30 is vertically fixed to the elevation plate 43. The lifting plate 43 is driven by the lifting driving assembly 44 to drive the lower chamber housing 30 to vertically move up and down. Thereby realizing that the transfer mechanism 40 drives the lower cavity shell 30 to move between the closed position and the open position, and the structure is simpler and more reasonable.

In detail, in the present embodiment, the translation driving assembly 42 includes: in the present embodiment, the rotary driver 421 may be a motor, but not limited to, the rotary driver 421 is fixed on the base frame 10, the screw 422 is pivoted on the base frame 10 along a horizontal direction from the closed position to the open position, the screw 422 is fixedly connected to an output end of the rotary driver 421, and the translation plate 41 is screwed on the screw 422. Then, the screw rod 422 is driven to rotate by the rotary driver 421, and then the screw rod 422 drives the translation plate 41 to reciprocate along the horizontal direction from the closed position to the open position, so that the structure is simpler and more reasonable. Further, the elevation drive assembly 44 includes: the second linear driver 441 may be an air cylinder, but not limited to this, the second linear driver 441 is vertically fixed on the translation plate 41, the lifting plate 43 is fixedly connected to the upper end of the driving shaft 511 of the second linear driver 441, and the second linear driver 441 drives the lifting plate 43 to drive the lower cavity housing 30 to vertically move up and down, so that the structure is simpler and more reasonable.

Preferably, in the present embodiment, the transfer mechanism 40 further includes: the vertical position sensor 45 and the horizontal position sensor 46 are fixed on the base frame 10, the vertical position sensor 45 is located at the closed position, and when the lower cavity shell 30 moves to the closed position, the lower cavity shell 30 triggers the vertical position sensor 45. Thereby realizing detection of whether the lower chamber housing 30 is moved to the closed position, facilitating the next action. The horizontal position sensor 46 is located below the closed position, and when the translation plate 41 moves directly below the closed position, the translation plate 41 triggers the horizontal position sensor 46. Thereby realizing detecting whether the lower translation plate 41 moves to the right lower part of the closed position, facilitating the next action, having more reasonable structure and safer and more convenient use. Alternatively, in the present embodiment, the vertical position sensor 45 and the horizontal position sensor 46 may be selected as photoelectric sensors, but are not limited thereto, and thus will not be described in detail herein.

Further, the air tightness detection device 100 of the present application further includes: the filling block 80, the filling block 80 is fixed in the lower receiving groove 31, and a receiving groove 81 for receiving and positioning the product 200 to be measured is formed in the filling block 80. Thereby realizing the accommodation and positioning of the product 200 to be measured, and the accommodation groove 81 can be designed into a corresponding matched shape according to the product 200 to be measured with different shapes and sizes, so as to realize the accommodation and positioning of the product 200 to be measured with different shapes and sizes, and the structure is more reasonable.

The operation principle of the air tightness detecting device 100 according to the present application will be described in detail with reference to the accompanying drawings:

Firstly, the rotation driver 421 drives the screw 422 to rotate forward, so that the screw 422 drives the translation plate 41 to move to the lower part of the opening position along the horizontal direction from the closing position to the opening position, the lower cavity shell 30 moves to the opening position (as shown in fig. 1), the product 200 to be tested can be placed in the accommodating groove 81 in the lower cavity shell 30, the rotation driver 421 drives the screw 422 to rotate reversely, the screw 422 drives the translation plate 41 to move to the lower part of the closing position along the horizontal direction from the opening position to the closing position, the horizontal position sensor 46 is triggered, and the second linear driver 441 drives the lifting plate 43 to drive the lower cavity shell 30 to move vertically upwards to the closing position, so that the opening of the lower accommodating groove 31 is in butt joint with the opening of the upper accommodating groove 21, the lower accommodating groove 31 and the upper accommodating groove 21 are closed to form an accommodating cavity, and the product 200 to be tested is accommodated in the accommodating cavity. Then, the first linear driver 51 drives the gas injection pipe 52 to vertically move downwards until the gas injection butt joint nozzle 53 is closely butt-jointed with the gas injection port 201 of the product 200 to be tested.

Then, the vacuum-pumping control valve 72 is operated so that the external air path for evacuating the accommodating chamber evacuates the accommodating chamber to a preset vacuum value through the vacuum connection pipe 71 and maintains the pressure. Meanwhile, the external air path for vacuumizing the product 200 to be tested vacuumizes the product 200 to a preset vacuum value through the first air injection channel 512 and the second air injection channel 521. Then, the external gas supply path for the gas to be tested injects the gas to be tested into the product 200 to be tested through the first gas injection channel 512 and the second gas injection channel 521.

Then, the detecting control valve 62 is operated to enable the detecting instrument to be communicated with the accommodating cavity so as to detect whether the detected gas leaks out of the product 200 to be detected in the accommodating cavity, if the detecting instrument detects that the detected gas does not exist in the accommodating cavity, the detected product 200 does not leak out of the detected gas, the product 200 to be detected does not have cracks or gaps, the sealing performance is good, and the product 200 to be detected is qualified. If the detector detects that the detected gas leaked from the product 200 to be detected exists in the accommodating cavity, and a crack or a gap exists on the product 200 to be detected, the product 200 to be detected is not qualified.

After the detection is completed, the detected gas in the product 200 to be detected is pumped away through the first gas injection channel 512 and the second gas injection channel 521 by the external detected gas supply gas channel, and then the vacuum of the product 200 to be detected is broken through the first gas injection channel 512 and the second gas injection channel 521 by the external gas channel for breaking the vacuum of the product 200 to be detected. Meanwhile, the vacuum breaking control valve 73 is operated so that the external air path for breaking the vacuum of the accommodating chamber breaks the vacuum of the accommodating chamber through the vacuum connection pipe 71. When the detector detects that the detected gas leaked from the product 200 to be detected exists in the accommodating cavity, the accommodating cavity is required to be blown to clean the leaked detected gas, the detected gas detection background value is reduced, and the conditions of inaccurate detection results and kill in error are prevented.

Then, the second linear driver 441 drives the lifting plate 43 to drive the lower cavity housing 30 to move vertically downward to the lower side of the closed position, and the rotary driver 421 drives the screw rod 422 to rotate forward, so that the screw rod 422 drives the translation plate 41 to move to the lower side of the open position along the horizontal direction from the closed position to the open position, the lower cavity housing 30 moves to the open position, and the product 200 to be tested can be taken out from the accommodating groove 81 in the lower cavity housing 30, thereby completing the detection of the air tightness of the product 200 to be tested, and detecting whether the tightness of the product 200 to be tested is good or not.

For example, the product 200 to be tested detected by the air tightness detection device 100 of the present application may be selected as a lithium battery, further may be selected as a blade lithium battery, the gas to be detected may be selected as helium, and the detector may be selected as a helium detector, thereby meeting the detection requirement of whether there is leakage of helium. Of course, the product 200 to be tested, the selected gas to be tested and the corresponding detector detected by the air tightness detection device 100 can be flexibly selected according to the actual detection requirement, and the application is not limited to this, and is not described in detail herein.

Because the upper chamber housing 20 of the air tightness detecting device 100 of the present application is fixed on the base frame 10, the lower chamber housing 30 is movably disposed on the base frame 10, and the lower chamber housing 30 has a closed position sealed to the upper chamber housing 20 and an open position far away from the upper chamber housing 20; the transfer mechanism 40 is arranged on the base frame 10, the lower cavity shell 30 is connected to the transfer mechanism 40 in a transmission way, and the transfer mechanism 40 drives the lower cavity shell 30 to move between a closed position and an open position; when the lower cavity shell 30 is positioned at the closed position, a closed accommodating cavity is formed between the lower cavity shell 30 and the upper cavity shell 20; the gas pumping and injecting connecting mechanism 50 to be tested is arranged on the base frame 10, the gas outlet end of the gas pumping and injecting connecting mechanism 50 to be tested extends into the accommodating cavity in a sealed mode, the gas outlet end of the gas pumping and injecting connecting mechanism 50 to be tested is in detachable butt joint communication with the gas injection port 201 on the product 200 to be tested, and the gas inlet end of the gas pumping and injecting connecting mechanism 50 to be tested is communicated with an external gas supply gas path to be tested, a gas path for vacuumizing the product 200 to be tested and a gas path for breaking vacuum of the product 200 to be tested; The air leakage detection mechanism 60 is arranged on the base frame 10, and the air leakage detection mechanism 60 is communicated into the accommodating cavity; the vacuum connection mechanism 70 is arranged on the base frame 10, the suction end of the vacuum connection mechanism 70 is communicated into the accommodating cavity, and the discharge end of the vacuum connection mechanism 70 is communicated with an external air path for vacuumizing the accommodating cavity and an external air path for breaking the accommodating cavity. Then, when the lower cavity casing 30 moves to the open position, the product 200 to be tested is placed in the lower cavity casing 30, and then the transfer mechanism 40 drives the lower cavity casing 30 to move to the closed position, so that the product 200 to be tested is accommodated in the accommodating cavity, then the air outlet end of the gas pumping and injecting connecting mechanism 50 to be tested is in butt joint communication with the air injection port 201 on the product 200 to be tested, and then the accommodating cavity is vacuumized to a preset vacuum value and maintained pressure by an external air circuit for vacuuming the accommodating cavity through the vacuum connecting mechanism 70; The external gas path for vacuumizing the product 200 to be tested is vacuumized to a preset vacuum value through the tested gas vacuumizing and injecting connecting mechanism 50, and then the external tested gas supply gas path is used for injecting the tested gas into the product 200 to be tested through the tested gas vacuumizing and injecting connecting mechanism 50. Detecting whether the detected gas leaks from the to-be-detected product 200 through the gas leakage detection mechanism 60, if the gas leakage detection mechanism 60 detects whether the detected gas leaks from the to-be-detected product 200, the to-be-detected product 200 is proved to have no leakage of the detected gas, the to-be-detected product 200 has no crack or gap, and the tightness is good, and the to-be-detected product 200 is qualified; If the gas leakage detection mechanism detects that the containing cavity has detected gas leaked from the product 200 to be detected, and a crack or gap exists on the product 200 to be detected, the product 200 to be detected is not qualified. After the detection is finished, the detected gas in the product 200 to be detected is pumped away by an external detected gas supply gas path through the detected gas pumping and injecting connecting mechanism 50, and then the vacuum of the product 200 to be detected is broken by an external gas path for breaking the vacuum of the product 200 to be detected through the detected gas pumping and injecting connecting mechanism 50; and simultaneously, an external air path for breaking vacuum on the accommodating cavity breaks vacuum on the accommodating cavity through the vacuum connecting mechanism 70. The lower chamber housing 30 is driven to move to the open position by the transfer mechanism 40, so that the product 200 to be tested can be taken out from the lower chamber housing 30. The structure is simpler, the manufacturing cost is greatly reduced, and the use and maintenance cost is lower. Moreover, the detection operation is simpler and more convenient, the detection efficiency is greatly improved, and the pressure maintaining effect is stable in the detection process, so that the detection result can be ensured to be accurate and stable. Moreover, through the switching cooperation structure of lower chamber casing 30 and upper chamber casing 20, except can compatible detection conventional lithium cell, can also compatible detection blade lithium cell, the compatibility improves greatly, can better satisfy the detection demand.

The present application has been described above in connection with the embodiments, but the present application is not limited to the embodiments disclosed above, but it is intended to cover various modifications, equivalent combinations according to the essence of the present application.

Claims (10)

1. An air tightness detection device suitable for detecting air tightness of a product to be detected, comprising: the device comprises a base frame, an upper cavity shell, a lower cavity shell, a transfer mechanism, a tested gas pumping and injecting connecting mechanism, a gas leakage detecting mechanism and a vacuum connecting mechanism, wherein the upper cavity shell is fixed on the base frame, the lower cavity shell is movably arranged on the base frame, and the lower cavity shell is provided with a closed position sealed in the upper cavity shell and an open position far away from the upper cavity shell; the transfer mechanism is arranged on the base frame, the lower cavity shell is connected to the transfer mechanism in a transmission way, and the transfer mechanism drives the lower cavity shell to move between the closed position and the open position; when the lower cavity shell is positioned at the closed position, a closed accommodating cavity is formed between the lower cavity shell and the upper cavity shell; the gas pumping and injecting connecting mechanism is arranged on the base frame, the gas outlet end of the gas pumping and injecting connecting mechanism is sealed and stretches into the accommodating cavity, the gas outlet end of the gas pumping and injecting connecting mechanism is detachably in butt joint communication with the gas injection port on the product to be tested, and the gas inlet end of the gas pumping and injecting connecting mechanism is communicated with an external gas supply gas channel of the gas to be tested, a gas channel for vacuumizing the product to be tested and a gas channel for breaking vacuum of the product to be tested; the air leakage detection mechanism is arranged on the base frame and is communicated into the accommodating cavity; the vacuum connecting mechanism is arranged on the base frame, the suction end of the vacuum connecting mechanism is communicated with the accommodating cavity, and the discharge end of the vacuum connecting mechanism is communicated with an external air path for vacuumizing the accommodating cavity and an air path for breaking the vacuum of the accommodating cavity.

2. The air tightness detection device according to claim 1, wherein an upper accommodation groove with a downward opening is formed in the upper chamber housing, a lower accommodation groove with a upward opening is formed in the lower chamber housing, and the lower accommodation groove and the upper accommodation groove are closed to form the accommodation chamber when the lower chamber housing is in the closed position.

3. The gas tightness detection device of claim 2 wherein said gas-under-test pump connection mechanism comprises: the device comprises a first linear driver and an air injection pipe, wherein the first linear driver is vertically fixed on a base frame, a driving shaft of the first linear driver is provided with a first air injection channel which vertically penetrates through the first linear driver, and the upper end of the first air injection channel is communicated with an external tested air supply air channel, an air channel for vacuumizing the product to be tested and an air channel for breaking vacuum of the product to be tested; the gas injection pipe is vertically fixedly connected to the lower end of the driving shaft of the first linear driver, the gas injection pipe is hermetically and slidably arranged on the top of the upper cavity shell in a penetrating manner and stretches into the upper accommodating groove, a vertically penetrating second gas injection channel is formed in the gas injection pipe, the upper end of the second gas injection channel is communicated with the lower end of the first gas injection channel, and the lower end of the gas injection pipe is detachably in butt joint communication with a gas injection port of a product to be tested.

4. A gas tightness detection device according to claim 3 wherein said gas under test pump connection means further comprises: the gas injection butt joint nozzle is fixedly sleeved at the lower end of the gas injection pipe.

5. The air tightness detection device according to claim 2, wherein said vacuum connection mechanism comprises: the vacuum connecting pipe is fixed on the base frame, the lower end of the vacuum connecting pipe is communicated with the upper accommodating groove, one end of the vacuum control valve is communicated with the upper end of the vacuum connecting pipe, and the other end of the vacuum control valve is communicated with an external air path for vacuumizing the accommodating cavity.

6. The air tightness detection device according to claim 5, wherein said vacuum connection mechanism further comprises: the vacuum breaking control valve is characterized in that one end of the vacuum breaking control valve is communicated with the vacuum connecting pipe, and the other end of the vacuum breaking control valve is communicated with an external air path for breaking vacuum in the accommodating cavity.

7. The air-tightness detection device according to claim 2, wherein the air-leakage detection mechanism includes: the detection connecting pipe is fixed on the base frame, the lower end of the detection connecting pipe is communicated with the upper accommodating groove, and the detection control valve is communicated between the upper end of the detection connecting pipe and the detector.

8. The air tightness detection device according to claim 1, wherein the transfer mechanism includes: the translation plate is arranged on the base frame in a moving mode along the horizontal direction from the closed position to the open position, the translation driving assembly is arranged on the base frame, and the translation plate is connected to the translation driving assembly in a transmission mode; the lifting plate vertically moves on the translation plate, the lifting driving assembly is arranged on the translation plate, and the lifting plate is in transmission connection with the lifting driving assembly; the lower cavity shell is vertically fixed on the lifting plate.

9. The air tightness detection device of claim 8 wherein said translation drive assembly comprises: the rotary driver is fixed on the base frame, the screw rod is pivoted on the base frame along the horizontal direction from the closed position to the open position, the screw rod is fixedly connected to the output end of the rotary driver, and the translation plate is in threaded connection with the screw rod;

The lift drive assembly includes: the second linear driver is vertically fixed on the translation plate, and the lifting plate is fixedly connected to the upper end of a driving shaft of the second linear driver;

The transfer mechanism further includes: the vertical position sensor and the horizontal position sensor are fixed on the base frame, the vertical position sensor is positioned at the closing position, and when the lower cavity shell moves to the closing position, the lower cavity shell triggers the vertical position sensor; the horizontal position sensor is positioned below the closed position, and when the translation plate moves to the position right below the closed position, the translation plate triggers the horizontal position sensor.

10. The air tightness detection device according to claim 2, further comprising: the filling block is fixed in the lower containing groove, and a containing groove for containing and positioning the product to be tested is formed in the filling block.