Secondary battery leak detection device

Abstract

The utility model discloses a leakage detection device for a secondary battery. The secondary battery leak detection device comprises a plurality of pressure containers, vacuumizing equipment, a leak detector and a leak marking piece, the plurality of pressure containers are connected in parallel, each pressure container is provided with a cavity, and the cavity is configured to contain a secondary battery; the vacuumizing equipment is communicated with the plurality of cavities; the leak detector is communicated with the plurality of cavities; and the leakage marking piece is communicated with the cavity. According to the secondary battery leak detection device, the leak rate detection of the secondary battery can be more accurate, and the situation that the secondary battery with the qualified leak rate is misjudged to be unqualified due to inaccurate detection of the leak rate value of the secondary battery is effectively prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of battery leakage rate detection equipment, in particular to a secondary battery leakage detection device. Background Art

[0002] In the production of secondary batteries, the square batteries need to be tested for leakage rate after the top cover is welded and the sealing pins are welded. The current leakage detection device usually includes a pressure vessel for accommodating the secondary battery, a vacuum device and a leak detector. The pressure vessel is connected to the vacuum device and the leak detector through pipelines.

[0003] However, when the above-mentioned leak detection device detects the secondary battery in the cavity, the leakage rate value detected by the leak detector includes the leakage rate value of the pressure vessel and the pipeline, that is, the leakage rate value detected is the leakage rate value of the pressure vessel and the pipeline plus the leakage rate value of the secondary battery itself, resulting in inaccurate leakage rate value of the secondary battery detected by the leak detection device, thereby resulting in inaccurate leakage rate assessment of the secondary battery, and easily leading to secondary batteries with qualified leakage rates being mistakenly judged as unqualified. Utility Model Content

[0004] The embodiment of the present application discloses a secondary battery leakage detection device, which can detect the leakage rate of the secondary battery more accurately, and effectively prevents a secondary battery with a qualified leakage rate from being misjudged as unqualified due to inaccurate detection of the leakage rate value of the secondary battery.

[0005] In order to achieve the above-mentioned purpose, the embodiment of the present application discloses a secondary battery leakage detection device, comprising:

[0006] A plurality of pressure vessels, the plurality of pressure vessels are connected in parallel, the pressure vessels having a cavity, the cavity being configured to accommodate a secondary battery;

[0007] A vacuum pumping device, the vacuum pumping device being in communication with the plurality of cavities;

[0008] A leak detector, the leak detector is connected to the plurality of cavities and is used to detect leakage rate values ​​of the secondary batteries contained in the plurality of cavities respectively; and

[0009] A leak mark component is connected to the cavity and is used to calibrate the leak rate value detected by the leak detector.

[0010] In a possible implementation, the leak detector is connected to the plurality of cavities respectively through a plurality of detection valves, and the plurality of detection valves are arranged in a one-to-one correspondence with the plurality of cavities.

[0011] In a possible implementation, the vacuum pumping device is connected to the plurality of cavities respectively through a plurality of vacuum valves, and the plurality of vacuum valves are arranged in a one-to-one correspondence with the plurality of cavities.

[0012] In a possible implementation, the vacuum pumping device is connected to the cavities of the plurality of pressure vessels respectively through a first main pipe and a plurality of first branch pipes, one end of the first main pipe is connected to the vacuum pumping device, and the other end is connected to the plurality of first branch pipes respectively, the plurality of first branch pipes are connected to the cavities of the plurality of pressure vessels in a one-to-one correspondence, and each of the first branch pipes is provided with the vacuum valve;

[0013] The leak detector is connected to the cavities of the multiple pressure vessels respectively through a second main pipe and multiple second branch pipes. One end of the second main pipe is connected to the leak detector, and the other end is connected to multiple second branch pipes respectively. The multiple second branch pipes are connected to the multiple first branch pipes one by one, and each of the second branch pipes is provided with the detection valve.

[0014] In a possible implementation, there are multiple missing mark parts, and the multiple missing mark parts are connected to the cavities of the multiple pressure vessels in a one-to-one correspondence. A missing mark valve is provided between the missing mark parts and the corresponding cavities.

[0015] In a possible implementation, the pressure vessel includes a fixed cavity and a movable cavity, the fixed cavity and the movable cavity enclose the cavity to form the cavity, the fixed cavity is fixedly arranged, and the movable cavity is movably arranged relative to the fixed cavity so that the secondary battery can be placed into the movable cavity or the fixed cavity when the movable cavity is separated from the fixed cavity, and the vacuum extraction equipment, the leak detector and the leak marking part are all connected to the fixed cavity.

[0016] In a possible implementation, the secondary battery leakage detection device further includes a transplanting module, which is connected to the movable cavity and is used to drive the movable cavity to move toward or away from the fixed cavity.

[0017] In a possible implementation, one pressure vessel has a plurality of cavities, and the plurality of cavities are independent of each other.

[0018] In a possible implementation, a vacuum breaking valve is connected between the vacuum pumping device and the cavity.

[0019] In a possible implementation manner, the vacuum breaker valve is connected to a muffler.

[0020] Compared with the prior art, this application has at least the following beneficial effects:

[0021] In the present application, multiple pressure vessels are connected in parallel, and the pressure vessels have cavities capable of accommodating secondary batteries, so that multiple secondary batteries can be placed in the cavities of multiple pressure vessels at the same time; and the vacuum pumping equipment is connected to the multiple cavities, so that the vacuum pumping equipment can vacuum the multiple cavities at the same time. Compared with the method in which one vacuum pumping equipment is connected to one cavity, the efficiency of vacuuming multiple secondary batteries can be effectively improved, thereby improving the leak detection efficiency of multiple secondary batteries.

[0022] The leak detector is connected to multiple cavities, so that after the multiple cavities containing secondary batteries are evacuated, the leak detector can be used to detect the leakage rate of the secondary batteries in the cavities one by one to obtain the leakage rate value of the secondary batteries. Compared with each cavity being connected to a leak detector, the number of leak detectors can be effectively reduced, thereby reducing costs.

[0023] The secondary battery leakage detection device also includes a leakage marking component, which is connected to the cavity, so that before placing the secondary battery in the cavity to perform leakage rate detection on the secondary battery, the leakage marking component in the secondary battery leakage detection device can be firstly subjected to leakage rate detection to obtain the detection leakage rate value of the leakage marking component in the secondary battery leakage detection device, and then the detection leakage rate value of the leakage marking component can be compared with the standard leakage rate value of the leakage marking component to obtain a correction coefficient a, a=standard leakage rate value / detection leakage rate value, and the calibration is completed, so that when the leakage rate of the secondary battery is detected and the detection leakage rate value of the secondary battery is obtained, the detection leakage rate value of the secondary battery is multiplied by the correction coefficient to obtain the actual leakage rate value of the secondary battery, thereby effectively improving the accuracy of the leakage rate detection of the secondary battery and avoiding the misjudgment of a secondary battery with a qualified leakage rate as unqualified due to inaccurate leakage rate value detection of the secondary battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 It is a structural schematic diagram of a secondary battery leakage detection device provided in an embodiment of the present application;

[0026] Figure 2 It is a structural schematic diagram of a secondary battery leakage detection device provided in an embodiment of the present application when a vacuum pumping device and a leakage detector are provided;

[0027] Figure 3 It is a structural schematic diagram of a secondary battery leakage detection device provided in an embodiment of the present application when a leakage marking component is also provided;

[0028] Figure 4 It is a structural schematic diagram of a secondary battery leakage detection device provided in an embodiment of the present application when a vacuum breaker valve and a muffler are also provided.

[0029] Description of reference numerals:

[0030] 1-pressure vessel; 11-cavity; 12-fixed cavity; 13-movable cavity; 2a-vacuum extraction equipment; 2b-vacuum valve; 2c-first main pipe; 2d-first branch pipe; 3a-leak detector; 3b-detection valve; 3c-second main pipe; 3d-second branch pipe; 4a-leakage mark; 4b-leakage mark valve; 5-transplantation module; 6-vacuum breaking valve; 7-muffler; 10-secondary battery leakage detection device. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0033] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0034] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0035] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0036] The embodiment of the present application discloses a secondary battery leakage detection device, which can detect the leakage rate of the secondary battery more accurately, and effectively prevents a secondary battery with a qualified leakage rate from being misjudged as unqualified due to inaccurate detection of the leakage rate value of the secondary battery.

[0037] The technical solution of the present application will be described in detail below with reference to specific embodiments and drawings.

[0038] The present application embodiment provides a secondary battery leakage detection device, such as Figure 1 As shown, it includes a plurality of pressure vessels 1, a vacuum pumping device 2a, a leak detector 3a and a leak mark 4a. The plurality of pressure vessels 1 are connected in parallel, the pressure vessel 1 has a cavity 11, and the cavity 11 is configured to accommodate a secondary battery; the vacuum pumping device 2a is connected to the plurality of cavities 11; the leak detector 3a is connected to the plurality of cavities 11, and is used to detect the leak rate value of the secondary batteries accommodated in the plurality of cavities 11 respectively; and the leak mark 4a is connected to the cavity 11, and is used to calibrate the leak rate value detected by the leak detector 3a.

[0039] The above-mentioned multiple pressure vessels 1 are connected in parallel, and the pressure vessel 1 has a cavity 11 capable of accommodating secondary batteries, so that multiple secondary batteries can be placed in the cavity 11 of the multiple pressure vessels 1 at the same time; and the vacuum pumping equipment 2a is connected with the multiple cavities 11, so that the vacuum pumping equipment 2a can vacuum the multiple cavities 11 at the same time. Compared with the method in which one vacuum pumping equipment 2a is connected with one cavity 11, the efficiency of vacuuming multiple secondary batteries can be effectively improved, thereby improving the leak detection efficiency of multiple secondary batteries.

[0040] The leak detector 3a is connected to multiple cavities 11, so that after the multiple cavities 11 containing secondary batteries are evacuated, the leak detector 3a can be used to detect the leakage rate of the secondary batteries in the cavities 11 one by one to obtain the leakage rate value of the secondary batteries. Compared with each cavity 11 being connected to a corresponding leak detector 3a, the number of leak detectors 3a can be effectively reduced, thereby reducing costs.

[0041] It should be explained that the leak rate refers to the amount of gas leaked per second.

[0042] When the leak detector 3a is used to detect the leakage rate of the secondary battery in the cavity 11, because the leak detector 3a is connected to the cavity 11, the leakage rate value detected by the leak detector 3a usually includes the leakage rate value of the cavity 11 and the leakage rate value of the secondary battery. Alternatively, when the leak detector 3a and the cavity 11 are connected through a pipeline, the leakage rate value detected by the leak detector 3a includes the leakage rate value of the cavity 11, the leakage rate value of the pipeline and the leakage rate value of the secondary battery, resulting in the leakage rate value directly read from the leak detector 3a is not the actual leakage rate value of the secondary battery, resulting in low leakage rate detection accuracy for the secondary battery, which can easily lead to the secondary battery with qualified leakage rate being misjudged as unqualified, resulting in over-inspection of the secondary battery.

[0043] Based on this, the secondary battery leakage detection device 10 of the present application also includes a leakage marking component 4a, which is connected to the cavity 11, so that before placing a secondary battery in the cavity 11 to perform leakage rate detection on the secondary battery, the leakage marking component 4a in the secondary battery leakage detection device 10 can be firstly subjected to leakage rate detection to obtain the detection leakage rate value of the leakage marking component 4a in the secondary battery leakage detection device 10, and then the detection leakage rate value of the leakage marking component 4a can be compared with the standard leakage rate value of the leakage marking component 4a to obtain a correction coefficient a, a=standard leakage rate value / detection leakage rate value, and the calibration is completed, so that when the leakage rate of the secondary battery is detected and the detection leakage rate value of the secondary battery is obtained, the detection leakage rate value of the secondary battery is multiplied by the correction coefficient to obtain the actual leakage rate value of the secondary battery, thereby effectively improving the accuracy of the leakage rate detection of the secondary battery and avoiding the misjudgment of a secondary battery with a qualified leakage rate as unqualified due to inaccurate leakage rate value detection of the secondary battery.

[0044] Exemplarily, when the leak detector 3a is calibrated by the leak marking piece 4a, the cavity 11 is first sealed, and then the cavity 11 is evacuated by the vacuum pumping device 2a until the air pressure in the cavity 11 is between 8Pa and 10Pa, and the vacuum pumping operation on the cavity 11 is stopped; then, the leak detector 3a is turned on to connect the leak detector 3a with the vacuumed cavity 11, and the leak rate value measured by the leak detector 3a is read. If the measured leak rate value is within the range of the preset leak rate value, the leak marking piece 4a is turned on, and the detection leak rate value measured by the leak detector 3a is read after the reading of the leak detector 3a stabilizes, and the leak marking piece 4a is turned off; finally, the detection leak rate value of the leak marking piece 4a is compared with the standard leak rate value of the leak marking piece 4a, that is, it is substituted into the formula a=standard leak rate value / detection leak rate value to obtain the correction coefficient a.

[0045] When detecting the leakage rate of a secondary battery, the secondary battery is placed in a calibrated pressure vessel 1, and the cavity 11 is sealed. Then, the cavity 11 containing the secondary battery is evacuated by a vacuum pumping device 2a until the air pressure in the cavity 11 is between 8Pa and 10Pa, and the vacuum pumping operation is stopped. Then, the leak detector 3a is turned on to connect the leak detector 3a with the evacuated cavity 11, and the leakage rate value of the secondary battery measured by the leak detector 3a is read. The leakage rate value of the secondary battery is multiplied by the correction coefficient a to obtain the actual leakage rate value of the secondary battery.

[0046] It should be noted that, since the leakage rate value of each pressure vessel 1 and the environment in which it is located are different, each pressure vessel 1 needs to be calibrated and marked respectively, so that the leakage rate value of the secondary battery in each pressure vessel 1 can be more accurate.

[0047] The number of the pressure vessels 1 can be two, three or more, which is not limited here.

[0048] The leak detector 3a can be any one of a hydrogen detector, a helium detector, etc., and is not limited here.

[0049] The gas in the leak detection part 4a can be compatible with the gas that can be detected by the leak detector 3a. For example, when the leak detector 3a is a hydrogen detector, the gas in the leak detection part 4a can contain hydrogen components; when the leak detector 3a is a helium detector, the gas components in the leak detection part 4a can contain helium.

[0050] Among them, the hydrogen detector is a mass spectrometry detection device for detecting gas containing hydrogen. It determines the gas leakage of the detected object per unit time by performing mass spectrometry analysis on the gas containing hydrogen leaked from the detected object, that is, determines the leakage rate of the detected object. Similarly, the helium detector is a mass spectrometry detection device for detecting gas containing helium. It determines the gas leakage of the detected object per unit time by performing mass spectrometry analysis on the gas containing helium leaked from the detected object, that is, determines the leakage rate of the detected object.

[0051] In some embodiments, Figure 2 As shown, the leak detector 3a is connected to the multiple cavities 11 respectively through the multiple detection valves 3b, and the multiple detection valves 3b are arranged in a one-to-one correspondence with the multiple cavities 11.

[0052] Thus, multiple detection valves 3b can be arranged one-to-one with multiple cavities 11, so that the cavity 11 of each pressure container 1 can be individually leak-tested by the leak detector 3a, which facilitates the leakage rate detection of secondary batteries in multiple pressure containers 1.

[0053] The detection valve 3b may be any one of a ball valve, a butterfly valve, a gate valve, etc., which is not limited here.

[0054] Alternatively, if Figure 2 As shown, the vacuum pumping device 2a is connected to the multiple cavities 11 through the multiple vacuum valves 2b, and the multiple vacuum valves 2b are arranged in a one-to-one correspondence with the multiple cavities 11.

[0055] Thus, multiple vacuum valves 2b can be set in one-to-one correspondence with the cavities 11 of multiple pressure vessels 1, so that the cavity 11 of each pressure vessel 1 can be evacuated individually through the vacuum pumping equipment 2a, so that when one cavity 11 or some of the cavities 11 need to be used, the cavity 11 that needs to be used or some of the cavities 11 can be evacuated individually, which facilitates the vacuum pumping operation of multiple cavities 11.

[0056] The vacuum valve 2b may be any one of a ball valve, a butterfly valve, a gate valve, etc., which is not limited here.

[0057] In addition, if Figure 2 As shown, the vacuum pumping equipment 2a is connected to the cavities 11 of the multiple pressure vessels 1 through the first main pipe 2c and multiple first branch pipes 2d, one end of the first main pipe 2c is connected to the vacuum pumping equipment 2a, and the other end is connected to the multiple first branch pipes 2d, the multiple first branch pipes 2d are connected to the cavities 11 of the multiple pressure vessels 1 one-to-one, and each first branch pipe 2d is provided with a vacuum valve 2b; the leak detector 3a is connected to the cavities 11 of the multiple pressure vessels 1 through the second main pipe 3c and multiple second branch pipes 3d, one end of the second main pipe 3c is connected to the leak detector 3a, and the other end is connected to the multiple second branch pipes 3d, the multiple second branch pipes 3d are connected to the multiple first branch pipes 2d one-to-one, and each second branch pipe 3d is provided with a detection valve 3b.

[0058] Therefore, an opening connected to the cavity 11 can be set on the pressure vessel 1, that is, it can be connected to the vacuum equipment 2a through the first main pipe 2c and the first branch pipe 2d, and connected to the leak detector 3a through the second main pipe 3c and the second branch pipe 3d. Compared with respectively setting openings connected to the vacuum equipment 2a and the leak detector 3a on the pressure vessel 1, the processing difficulty of the pressure vessel 1 can be effectively reduced, the number of pipelines can be reduced, the space occupied by the pipelines and the difficulty of arranging the pipelines are reduced, thereby reducing the difficulty of manufacturing the secondary battery leakage detection device 10.

[0059] The second branch pipe 3d and the first branch pipe 2d can be connected via a quick connector, so that the connection between the second branch pipe 3d and the first branch pipe 2d can be simple and convenient.

[0060] In addition, the vacuum valve 2b is located on the first branch pipe 2d between the connection between the first branch pipe 2d and the second branch pipe 3d and the connection between the first branch pipe and the first main pipe 2c, so that the opening of the vacuum valve 2b and the detection valve 3b are not affected by each other.

[0061] Of course, in other embodiments, the vacuum pumping device 2a can be connected to the cavities 11 of the multiple pressure vessels 1 through the first main pipe 2c and the multiple first branch pipes 2d, one end of the first main pipe 2c is connected to the vacuum pumping device 2a, and the other end is connected to the multiple first branch pipes 2d, the multiple first branch pipes 2d are connected to the cavities 11 of the multiple pressure vessels 1 one by one, and each first branch pipe 2d is provided with a vacuum valve 2b; the leak detector 3a is connected to the cavities 11 of the multiple pressure vessels 1 through the second main pipe 3c and the multiple second branch pipes 3d, one end of the second main pipe 3c is connected to the leak detector 3a, and the other end is connected to the multiple second branch pipes 3d, the multiple second branch pipes 3d are connected to the cavities 11 of the multiple pressure vessels 1 one by one, and each second branch pipe 3d is provided with a detection valve 3b. That is, the vacuum pumping valve 2b and the leak detector 3a are connected to the cavity 11 of the pressure vessel 1 through independent pipelines.

[0062] In some embodiments, Figure 3 As shown, there are multiple missing mark pieces 4 a , and the multiple missing mark pieces 4 a are connected to the cavities 11 of the multiple pressure vessels 1 in a one-to-one correspondence. A missing mark valve 4 b is provided between the missing mark piece 4 a and the corresponding cavity 11 .

[0063] Therefore, the cavity 11 of each pressure vessel 1, or the cavity 11 of each pressure vessel 1 and the pipeline connected to the cavity 11 can be conveniently calibrated and denoted through the corresponding leakage marking part 4a to obtain a correction coefficient with higher accuracy, so that the secondary batteries placed in each pressure vessel 1 can be detected to obtain a leakage rate value with higher accuracy.

[0064] Among them, multiple marking leak parts 4a are connected to the cavities 11 of multiple pressure vessels 1 in a one-to-one correspondence. The pressure vessel 1 may be provided with a marking leak opening that is connected to the cavity 11. A marking leak pipeline is connected between the marking leak opening on the pressure vessel 1 and the corresponding marking leak part 4a. The marking leak valve 4b is provided on the marking leak pipeline. The structure is simple and easy to implement.

[0065] Of course, in other embodiments, the number of the missing marking piece 4a can also be one. The missing marking piece 4a is connected to the cavities 11 of multiple pressure vessels 1 through multiple pipelines, and the multiple pipelines are connected to the multiple pressure vessels 1 one by one, and a missing marking valve 4b is provided on each pipeline. In this way, the number of missing marking pieces 4a can be reduced and the cost is reduced.

[0066] In some embodiments, Figure 3As shown, the pressure vessel 1 includes a fixed cavity 12 and a movable cavity 13. The fixed cavity 12 and the movable cavity 13 enclose a cavity 11. The fixed cavity 12 is fixedly arranged, and the movable cavity 13 is movably arranged relative to the fixed cavity 12, so that a secondary battery can be placed into the movable cavity 13 or the fixed cavity 12 when the movable cavity 13 is separated from the fixed cavity 12. The vacuum equipment 2a, the leak detector 3a and the leak marking part 4a are all connected to the fixed cavity 12.

[0067] Therefore, by connecting the vacuum equipment 2a, the leak detector 3a and the leak mark 4a to the fixed cavity 12, the pipelines connected between the vacuum equipment 2a, the leak detector 3a and the leak mark 4a and the pressure vessel 1 will not be affected by the secondary battery being placed in the cavity 11 or being taken out of the cavity 11, that is, the pipelines connected between the vacuum equipment 2a, the leak detector 3a and the leak mark 4a and the pressure vessel 1 will not be easily moved, which facilitates the arrangement of the pipelines, thereby reducing the difficulty of manufacturing the secondary battery leak detection device 10.

[0068] Among them, when the fixed cavity 12 and the movable cavity 13 are combined to form the cavity 11, the fixed cavity 12 and the movable cavity 13 can be threadedly connected through a threaded pair, which facilitates the disassembly and assembly between the fixed cavity 12 and the movable cavity 13; and a sealing ring or the like can be provided between the two, so that the cavity 11 formed by the fixed cavity 12 and the movable cavity 13 can have better sealing properties.

[0069] In addition, when the movable cavity 13 is separated from the fixed cavity 12, a secondary battery is placed into the movable cavity 13 or the fixed cavity 12. The secondary battery may be placed into the movable cavity 13 when the movable cavity 13 is separated from the fixed cavity 12, such as when the movable cavity 13 is located below the fixed cavity 12 in the vertical direction, the secondary battery may be placed into the movable cavity 13; or the secondary battery may be placed into the fixed cavity 12 when the movable cavity 13 is separated from the fixed cavity 12, such as when the fixed cavity 12 is located below the movable cavity 13 in the vertical direction, the secondary battery may be placed into the fixed cavity 12. This is not limited here and may be selected according to actual conditions.

[0070] The movable cavity 13 is movably arranged relative to the fixed cavity 12. The movable cavity 13 can be moved away from or close to the fixed cavity 12 manually or by a transport device, which is not limited here.

[0071] Alternatively, if Figure 3 As shown, the secondary battery leakage detection device 10 further includes a transplanting module 5 , which is connected to the movable cavity 13 and is used to drive the movable cavity 13 to move toward or away from the fixed cavity 12 .

[0072] Thus, the movement of the movable cavity 13 relative to the fixed cavity 12 can save time and effort, and the efficiency of placing the secondary battery into the cavity 11 or taking it out from the cavity 11 is improved, thereby effectively improving the detection efficiency of the secondary battery leakage detection device 10 on the secondary battery.

[0073] Among them, the transplanting module 5 can have a variety of implementation methods, for example, the transplanting module 5 may include a linear motor and a manipulator, the driving end of the linear motor is connected to the manipulator, the manipulator is used to clamp the movable cavity 13, so that when the linear motor drives the manipulator to move, the movable cavity 13 can be driven to move in a direction away from or close to the fixed cavity 12, and the moving distance of the movable cavity 13 can be controlled more accurately; it can also be that the transplanting module 5 includes a cylinder, the piston rod of the cylinder is connected to the movable cavity 13, so that when the piston rod is extended or retracted, the movable cavity 13 can be driven to move in a direction close to or away from the fixed cavity 12, and the structure is simple and easy to implement; of course, the transplanting module 5 can also be other implementation methods, which are not limited here.

[0074] Each of the pressure vessels 1 may have one or more cavities 11. Figure 3 As shown, a pressure vessel 1 may have a plurality of chambers 11 , and the plurality of chambers 11 are independent of each other.

[0075] Thus, multiple secondary batteries can be placed in the pressure vessel 1 at one time, and the multiple secondary batteries can be placed in multiple independent cavities 11 respectively, so that the vacuum environment of the multiple secondary batteries and the detected leakage rate values ​​are not affected by each other, effectively improving the detection efficiency of the multiple secondary batteries.

[0076] Among them, multiple cavities 11 of a pressure vessel 1 are connected to the vacuum equipment 2a, the leak detector 3a and the leak marking part 4a through corresponding pipelines, so that the leakage rate detection of the secondary battery in each cavity 11 is not affected by other cavities 11, effectively improving the accuracy of leakage detection of the secondary battery through the secondary battery leak detection device 10.

[0077] In addition, the number of cavities 11 that a pressure vessel 1 may have may be two, three or more, which is not limited herein.

[0078] In other embodiments, a pressure vessel 1 may have a cavity 11 , thereby making the structure of the pressure vessel 1 relatively simple and reducing the difficulty of manufacturing the pressure vessel 1 .

[0079] In some embodiments, Figure 4 As shown, a vacuum breaking valve 6 is connected between the vacuum pumping device 2a and the cavity 11.

[0080] Therefore, the vacuum degree in the cavity 11 and the vacuum degree in the pipeline connecting the vacuum pumping device 2a and the cavity 11 can be adjusted through the vacuum breaking valve 6, so that the air pressure of the vacuum environment in which the secondary battery placed in the cavity 11 is located can be relatively stable, so that the leakage rate value detected by the leak detector 3a is not easily affected by the air pressure, further improving the leakage rate detection accuracy of the secondary battery.

[0081] The vacuum breaking valve 6 may be any one of a manual vacuum breaking valve 6 and an electromagnetically controlled vacuum breaking valve 6 , and is not limited here.

[0082] When the vacuum pumping equipment 2a is connected to the cavities 11 of multiple pressure vessels 1 through the first main pipe 2c and multiple first branch pipes 2d, there can be multiple vacuum breaker valves 6, and one vacuum breaker valve 6 can be set on each first branch pipe 2d, so that the air pressure of the vacuum environment of the secondary battery in each cavity 11 can be relatively stable.

[0083] Alternatively, if Figure 4 As shown, the vacuum breaker valve 6 is connected to a muffler 7 .

[0084] Therefore, the noise of the vacuum breaker valve 6 when opening the valve to control the inflow and outflow of gas can be effectively reduced, and the secondary battery leakage detection device 10 is prevented from generating large noise when in use, thereby providing a better working environment for the staff.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A secondary battery leakage detection device, characterized in that: include: A plurality of pressure containers (1), wherein the plurality of pressure containers (1) are connected in parallel, wherein the pressure container (1) has a cavity (11), and the cavity (11) is configured to accommodate a secondary battery; A vacuum pumping device (2a), wherein the vacuum pumping device (2a) is connected to the plurality of cavities (11); A leak detector (3a), the leak detector (3a) being in communication with the plurality of cavities (11) and being used to detect leakage rate values ​​of the secondary batteries accommodated in the plurality of cavities (11); as well as, A leak mark component (4a), the leak mark component (4a) is connected to the cavity (11) and is used to calibrate the leak rate value detected by the leak detector (3a).

2. The secondary battery leakage detection device according to claim 1, characterized in that: The leak detector (3a) is respectively connected to the plurality of cavities (11) via a plurality of detection valves (3b), and the plurality of detection valves (3b) are arranged in a one-to-one correspondence with the plurality of cavities (11).

3. The secondary battery leakage detection device according to claim 2, characterized in that: The vacuum extraction equipment (2a) is respectively connected to the plurality of cavities (11) via a plurality of vacuum valves (2b), and the plurality of vacuum valves (2b) are arranged in a one-to-one correspondence with the plurality of cavities (11).

4. The secondary battery leakage detection device according to claim 3, characterized in that: The vacuum pumping device (2a) is respectively connected to the cavities (11) of the plurality of pressure vessels (1) through a first main pipe (2c) and a plurality of first branch pipes (2d); one end of the first main pipe (2c) is connected to the vacuum pumping device (2a), and the other end is respectively connected to the plurality of first branch pipes (2d); the plurality of first branch pipes (2d) are connected to the cavities (11) of the plurality of pressure vessels (1) in a one-to-one correspondence; and each of the first branch pipes (2d) is provided with the vacuum valve (2b); The leak detector (3a) is connected to the cavities (11) of the plurality of pressure vessels (1) via a second main pipe (3c) and a plurality of second branch pipes (3d). One end of the second main pipe (3c) is connected to the leak detector (3a), and the other end is connected to the plurality of second branch pipes (3d). The plurality of second branch pipes (3d) are connected to the plurality of first branch pipes (2d) in a one-to-one correspondence, and each of the second branch pipes (3d) is provided with the detection valve (3b).

5. The secondary battery leakage detection device according to claim 1, characterized in that: There are a plurality of the marking missing parts (4a), and the plurality of the marking missing parts (4a) are connected to the cavities (11) of the plurality of pressure vessels (1) in a one-to-one correspondence. A marking missing valve (4b) is provided between the marking missing parts (4a) and the corresponding cavities (11).

6. The secondary battery leakage detection device according to any one of claims 1 to 5, characterized in that: The pressure container (1) comprises a fixed cavity (12) and a movable cavity (13); the fixed cavity (12) and the movable cavity (13) enclose the cavity (11); the fixed cavity (12) is fixedly arranged; the movable cavity (13) is movably arranged relative to the fixed cavity (12) so that the secondary battery can be placed into the movable cavity (13) or the fixed cavity (12) when the movable cavity (13) is separated from the fixed cavity (12); the vacuum pumping device (2a), the leak detector (3a) and the leak marking component (4a) are all connected to the fixed cavity (12).

7. The secondary battery leakage detection device according to claim 6, characterized in that: The secondary battery leakage detection device (10) further comprises a transplanting module (5), wherein the transplanting module (5) is connected to the movable cavity (13) and is used to drive the movable cavity (13) to move in a direction approaching or away from the fixed cavity (12).

8. The secondary battery leakage detection device according to any one of claims 1 to 5, characterized in that: One of the pressure containers (1) has a plurality of the chambers (11), and the plurality of chambers (11) are independent of each other.

9. The secondary battery leakage detection device according to any one of claims 1 to 5, characterized in that: A vacuum breaking valve (6) is connected between the vacuum extraction device (2a) and the cavity (11).

10. The secondary battery leakage detection device according to claim 9, characterized in that: The vacuum breaking valve (6) is connected to a muffler (7).

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