Secondary battery leak rate measurement device

Abstract

A secondary battery leak rate measurement device, comprising a plurality of pressure containers (1), a vacuumizing device (2a), a leak rate measurement instrument (3a), and leak rate calibrating members (4a), wherein the plurality of pressure containers (1) are connected in parallel, each pressure container (1) is provided with a cavity (11), the cavity (11) is configured to accommodate a secondary battery, the vacuumizing device (2a) is in communication with a plurality of cavities (11), the leak rate measurement instrument (3a) is in communication with the plurality of cavities (11), and the leak rate calibrating members (4a) are in communication with the cavities (11). The secondary battery leak rate measurement device achieves accurate secondary battery leak rate measurement, and effectively prevents a secondary battery of which the leak rate is compliant from being misjudged to have a non-compliant leak rate due to inaccurate secondary battery leak rate value measurement.

Description

Secondary battery leakage detection device

[0001] This disclosure claims priority to a Chinese patent application filed with the Patent Office of China on December 29, 2023, with application number 202323661756.4 and application name “A Secondary Battery Leakage Detection Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present disclosure relates to the technical field of battery leakage rate detection equipment, and in particular to a secondary battery leakage detection device. Background Art

[0003] During secondary battery production, prismatic batteries require leak rate testing after the top cover and sealing pins are welded. Current leak detection equipment typically includes a pressure vessel housing the secondary battery, a vacuum pump, and a leak detector. The pressure vessel is connected to the vacuum pump and leak detector via pipelines.

[0004] 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.

[0005] Summary of the Invention

[0006] 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 the secondary battery with a qualified leakage rate from being mistakenly judged as unqualified due to inaccurate detection of the leakage rate value of the secondary battery.

[0007] To achieve the above objectives, the present invention discloses a secondary battery leakage detection device, comprising:

[0008] a plurality of pressure vessels, the plurality of pressure vessels being connected in parallel, the pressure vessels having a cavity configured to accommodate a secondary battery;

[0009] A vacuum pumping device, the vacuum pumping device being in communication with the plurality of cavities;

[0010] a leak detector, the leak detector being in communication with the plurality of cavities and being used to detect leakage rate values ​​of the secondary batteries contained in the plurality of cavities respectively; and

[0011] A leak mark component is communicated with the cavity and is used to calibrate the leak rate value detected by the leak detector.

[0012] In a possible implementation, the leak detector is connected to the multiple cavities respectively through multiple detection valves, and the multiple detection valves are arranged in a one-to-one correspondence with the multiple cavities.

[0013] In a possible implementation, the vacuum pumping device is connected to the multiple cavities respectively through multiple vacuum valves, and the multiple vacuum valves are arranged in a one-to-one correspondence with the multiple cavities.

[0014] In one possible implementation, the vacuum pumping device is connected to the cavities of the multiple pressure vessels via a first main pipe and multiple 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 multiple first branch pipes. The multiple first branch pipes are connected to the cavities of the multiple pressure vessels in a one-to-one correspondence, and each first branch pipe is provided with the vacuum valve.

[0015] The leak detector is connected to the cavities of the multiple pressure vessels 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. The multiple second branch pipes are connected to the multiple first branch pipes in a one-to-one correspondence, and each second branch pipe is provided with the detection valve.

[0016] In a possible implementation, there are multiple missing mark components, and the multiple missing mark components 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 component and the corresponding cavity.

[0017] In one 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 equipment, the leak detector and the leak marking part are all connected to the fixed cavity.

[0018] In a possible implementation, the secondary battery leak detection device further includes a transplanting module, which is connected to the movable cavity and is configured to drive the movable cavity to move toward or away from the fixed cavity.

[0019] In a possible implementation, one pressure vessel has a plurality of cavities, and the plurality of cavities are independent of each other.

[0020] In a possible implementation, a vacuum breaking valve is connected between the vacuum pumping device and the cavity.

[0021] In a possible implementation, the vacuum breaker valve is connected to a muffler.

[0022] Compared with the prior art, this application has at least the following beneficial effects:

[0023] In the present application, multiple pressure vessels are connected in parallel, and the pressure vessels have cavities that can accommodate 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 of connecting one vacuum pumping equipment to one cavity, the efficiency of vacuuming multiple secondary batteries can be effectively improved, thereby improving the leak detection efficiency of multiple secondary batteries.

[0024] The leak detector is connected to multiple cavities, so that after the multiple cavities containing secondary batteries are evacuated, the leak rate of the secondary batteries in the cavities can be detected one by one through the leak detector 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, reducing costs.

[0025] The secondary battery leakage detection device also includes a leakage marking component, which is connected to the cavity, so that before placing a 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 first 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, which effectively improves the accuracy of the leakage rate detection of the secondary battery and avoids the secondary battery with qualified leakage rate being misjudged as unqualified due to inaccurate leakage rate detection of the secondary battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] FIG1 is a schematic structural diagram of a secondary battery leakage detection device provided in an embodiment of the present application;

[0028] FIG2 is a schematic structural diagram of a secondary battery leak detection device provided in an embodiment of the present application, provided with a vacuum pump and a leak detector;

[0029] 3 is a schematic structural diagram of a secondary battery leakage detection device provided in an embodiment of the present application when a leakage indicator is also provided;

[0030] FIG4 is a schematic structural diagram of a secondary battery leakage detection device provided in an embodiment of the present application, which is also provided with a vacuum breaker valve and a muffler.

[0031] Explanation of the accompanying symbols: 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 component; 4b-leakage mark valve; 5-transplanting module; 6-vacuum breaking valve; 7-muffler; 10-secondary battery leakage detection device. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0033] In this disclosure, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this disclosure and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0034] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to express a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on the specific circumstances.

[0035] Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0036] Furthermore, the terms "first," "second," etc., are primarily used to distinguish between different devices, elements, or components (which may or may not be of the same type and configuration), and are not intended to indicate or imply the relative importance or quantity of the devices, elements, or components indicated. Unless otherwise specified, "plurality" means two or more.

[0037] 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 the secondary battery with a qualified leakage rate from being mistakenly judged as unqualified due to inaccurate detection of the leakage rate value of the secondary battery.

[0038] The technical solution of this application will be described in detail below with reference to specific embodiments and drawings.

[0039] An embodiment of the present application provides a secondary battery leak detection device, as shown in FIG1 , comprising multiple pressure vessels 1, a vacuum pumping device 2a, a leak detector 3a, and a leak detection component 4a. The multiple pressure vessels 1 are connected in parallel, each having a cavity 11 configured to accommodate a secondary battery; the vacuum pumping device 2a is in communication with the multiple cavities 11; the leak detector 3a is in communication with the multiple cavities 11 and is used to detect leakage rates of the secondary batteries housed in the multiple cavities 11; and the leak detection component 4a is in communication with the cavities 11 and is used to calibrate the leakage rates detected by the leak detector 3a.

[0040] The above-mentioned multiple pressure vessels 1 are connected in parallel, and the pressure vessel 1 has a cavity 11 that can accommodate secondary batteries, so that multiple secondary batteries can be placed in the cavity 11 of multiple pressure vessels 1 at the same time; and the vacuum pumping equipment 2a is connected to 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 of connecting one vacuum pumping equipment 2a to one cavity 11, the efficiency of vacuuming multiple secondary batteries can be effectively improved, thereby improving the leak detection efficiency of multiple secondary batteries.

[0041] 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 cavity 11 one by one to obtain the leakage rate value of the secondary battery. 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.

[0042] It should be explained that the leak rate refers to the amount of gas leaked per second.

[0043] When the leak rate of the secondary battery in the cavity 11 is detected by the leak detector 3a, since the leak detector 3a is connected to the cavity 11, the leak rate value detected by the leak detector 3a usually includes the leak rate value of the cavity 11 and the leak rate value of the secondary battery. Alternatively, when the leak detector 3a and the cavity 11 are connected through a pipeline, the leak rate value detected by the leak detector 3a includes the leak rate value of the cavity 11, the leak rate value of the pipeline and the leak rate value of the secondary battery. As a result, the leak rate value directly read from the leak detector 3a is not the actual leak rate value of the secondary battery, resulting in low accuracy in the leak rate detection of the secondary battery, which can easily lead to the secondary battery with a qualified leak rate being misjudged as unqualified, resulting in over-inspection of the secondary battery.

[0044] Based on this, the secondary battery leak 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 leak detection device 10 can be first subjected to leakage rate detection to obtain the detection leakage rate value of the leakage marking component 4a in the secondary battery leak 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, which effectively improves the accuracy of the leakage rate detection of the secondary battery and avoids the misjudgment of a secondary battery with a qualified leakage rate as unqualified due to inaccurate leakage rate value detection of the secondary battery.

[0045] For example, when the leak detector 3a is calibrated by the leak marking part 4a, the cavity 11 is first sealed, and then the cavity 11 is evacuated by the vacuum equipment 2a until the air pressure in the cavity 11 is between 8Pa and 10Pa, and the vacuuming operation on the cavity 11 is stopped; then, the leak detector 3a is turned on, so that the leak detector 3a is connected to 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 preset leak rate value range, the leak marking part 4a is turned on, and after the reading of the leak detector 3a stabilizes, the detection leak rate value measured by the leak detector 3a is read, and the leak marking part 4a is closed; finally, the detection leak rate value of the leak marking part 4a is compared with the standard leak rate value of the leak marking part 4a, that is, it is substituted into the formula a=standard leak rate value / detection leak rate value to obtain the correction coefficient a.

[0046] When testing the leakage rate of a secondary battery, the secondary battery is placed in a calibrated pressure vessel 1, and the cavity 11 is sealed. The cavity 11 containing the secondary battery is then evacuated by a vacuum pump 2a until the air pressure in the cavity 11 is between 8 Pa and 10 Pa, 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.

[0047] 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 calibrated separately to ensure that the leakage rate value of the secondary battery in each pressure vessel 1 can be more accurate.

[0048] The number of the pressure vessels 1 can be two, three or more, which is not limited here.

[0049] The leak detector 3a can be any one of a hydrogen detector, a helium detector, etc., and is not limited here.

[0050] The gas in the leak detection part 4a can be adapted to 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.

[0051] A hydrogen detector is a mass spectrometry device that detects gases containing hydrogen. It performs mass spectrometry analysis on the hydrogen-containing gas leaked from the object to determine the amount of gas leaked per unit time, i.e., the leak rate of the object. Similarly, a helium detector is a mass spectrometry device that detects gases containing helium. It performs mass spectrometry analysis on the helium-containing gas leaked from the object to determine the amount of gas leaked per unit time, i.e., the leak rate of the object.

[0052] In some embodiments, as shown in FIG. 2 , the leak detector 3 a is connected to the multiple cavities 11 through the multiple detection valves 3 b , and the multiple detection valves 3 b are arranged in a one-to-one correspondence with the multiple cavities 11 .

[0053] Thus, multiple detection valves 3b can be set in a one-to-one correspondence with multiple cavities 11, so that the cavity 11 of each pressure vessel 1 can be individually tested for leakage rate by the leak detector 3a, which facilitates the detection of leakage rates of secondary batteries in multiple pressure vessels 1.

[0054] The detection valve 3b can be any one of a ball valve, a butterfly valve, a gate valve, etc., which is not limited here.

[0055] Optionally, as shown in FIG2 , the vacuuming device 2 a is connected to the multiple cavities 11 respectively through multiple vacuum valves 2 b , and the multiple vacuum valves 2 b are arranged in a one-to-one correspondence with the multiple cavities 11 .

[0056] 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 vacuumed individually through the vacuum equipment 2a, so that when one cavity 11 or some of the cavities 11 need to be used, the cavity 11 or some of the cavities 11 that need to be used can be vacuumed individually, which facilitates the vacuuming operation of multiple cavities 11.

[0057] The vacuum valve 2b may be any one of a ball valve, a butterfly valve, a gate valve, etc., and is not limited here.

[0058] In addition, as shown in Figure 2, the vacuum pumping equipment 2a is respectively connected to the cavities 11 of 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 respectively connected to the multiple first branch pipes 2d. The multiple first branch pipes 2d are connected to the cavities 11 of 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 respectively connected to the cavities 11 of 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.

[0059] Therefore, an opening connected to the cavity 11 can be provided 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 providing 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 can be reduced, and the manufacturing difficulty of the secondary battery leakage detection device 10 can be reduced.

[0060] 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.

[0061] 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.

[0062] Of course, in other embodiments, the vacuum pumping device 2a may be connected to the cavities 11 of the multiple pressure vessels 1 via a first main pipe 2c and 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 in a one-to-one correspondence, 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 via a 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 cavities 11 of the multiple pressure vessels 1 in a one-to-one correspondence, 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 cavities 11 of the pressure vessels 1 via independent pipelines.

[0063] In some embodiments, as shown in FIG3 , there are multiple missing marking pieces 4 a , and the multiple missing marking pieces 4 a are connected to the cavities 11 of the multiple pressure vessels 1 in a one-to-one correspondence. A missing marking valve 4 b is provided between the missing marking piece 4 a and the corresponding cavity 11 .

[0064] Thus, 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 calibrated 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.

[0065] Among them, multiple leakage marking parts 4a are connected one-to-one with the cavities 11 of multiple pressure vessels 1. They can be leakage marking openings arranged on the pressure vessel 1 and connected with the cavity 11. A leakage marking pipeline is connected between the leakage marking opening on the pressure vessel 1 and the corresponding leakage marking parts 4a. The leakage marking valve 4b is arranged on the leakage marking pipeline. The structure is simple and easy to implement.

[0066] Of course, in other embodiments, the number of missing marking parts 4a can also be one. The missing marking part 4a is connected to the cavities 11 of multiple pressure vessels 1 through multiple pipelines, and multiple pipelines are connected to multiple pressure vessels 1 one by one. A missing marking valve 4b is provided on each pipeline. In this way, the number of missing marking parts 4a can be reduced and the cost is reduced.

[0067] In some embodiments, as shown in Figure 3, 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 component 4a are all connected to the fixed cavity 12.

[0068] Therefore, by connecting the vacuum equipment 2a, the leak detector 3a and the missing component 4a to the fixed cavity 12, the pipelines connected between the vacuum equipment 2a, the leak detector 3a and the missing component 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 missing component 4a and the pressure vessel 1 will not be easily moved, which facilitates the arrangement of the pipelines and reduces the difficulty of manufacturing the secondary battery leak detection device 10.

[0069] 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 connected by a threaded pair, which makes it easy to disassemble and assemble the fixed cavity 12 and the movable cavity 13; and a sealing ring 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.

[0070] In addition, when the movable cavity 13 is separated from the fixed cavity 12, the secondary battery is placed into the movable cavity 13 or the fixed cavity 12. The secondary battery can 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 can be placed into the movable cavity 13; or the secondary battery can 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 can be placed into the fixed cavity 12. This is not limited here and can be selected according to actual conditions.

[0071] The movable cavity 13 is movably arranged relative to the fixed cavity 12. The movable cavity 13 can be moved away from or closer to the fixed cavity 12 manually, or moved away from or closer to the fixed cavity 12 by a transport device, which is not limited here.

[0072] Optionally, as shown in FIG. 3 , the secondary battery leak 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 .

[0073] 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.

[0074] 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, it can drive the movable cavity 13 to move in the 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, it can drive the movable cavity 13 to move in the 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.

[0075] Each of the pressure vessels 1 may have one or more cavities 11. In some embodiments, as shown in FIG3 , a pressure vessel 1 may have multiple cavities 11, and the multiple cavities 11 are independent of each other.

[0076] 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 environments of the multiple secondary batteries and the leak rate values ​​detected are not affected by each other, effectively improving the detection efficiency of the multiple secondary batteries.

[0077] Among them, multiple cavities 11 of a pressure vessel 1 are connected to the vacuum equipment 2a, the leak detector 3a and the leakage 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 leakage detection device 10.

[0078] 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.

[0079] In other embodiments, a pressure vessel 1 may have a cavity 11 , thereby making the structure of the pressure vessel 1 simpler and reducing the difficulty of manufacturing the pressure vessel 1 .

[0080] In some embodiments, as shown in FIG. 4 , a vacuum breaker valve 6 is connected between the vacuum pumping device 2 a and the cavity 11 .

[0081] Thus, 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 breaker 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, thereby making the leakage rate value detected by the leak detector 3a less susceptible to the influence of air pressure, further improving the leakage rate detection accuracy of the secondary battery.

[0082] The vacuum breaker valve 6 may be any one of a manual vacuum breaker valve 6 and an electromagnetically controlled vacuum breaker valve 6 , and is not limited here.

[0083] 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 a vacuum breaker valve 6 can be set on each first branch pipe 2d, so that the air pressure of the vacuum environment in which the secondary battery in each cavity 11 is located can be relatively stable.

[0084] Optionally, as shown in FIG4 , the vacuum breaker valve 6 is connected to a muffler 7 .

[0085] Thus, 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.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A secondary battery leak detection device, characterized in that, Comprising: A plurality of pressure vessels (1), the plurality of pressure vessels (1) being connected in parallel, the pressure vessel (1) having a cavity (11), the cavity (11) being configured to accommodate secondary batteries; A vacuum pumping device (2a), the vacuum pumping device (2a) being in communication with the plurality of cavities (11); A leak detector (3a), the leak detector (3a) being in communication with the plurality of cavities (11) for respectively detecting the leak rate values of the secondary batteries accommodated in the plurality of cavities (11); And, A standard leak component (4a), the standard leak component (4a) being in communication with the cavity (11) for calibrating the leak rate values detected by the leak detector (3a).

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

3. The secondary battery leak detection device according to claim 2, characterized in that, The vacuum pumping device (2a) is respectively in communication with the plurality of cavities (11) through a plurality of vacuum valves (2b), and the plurality of vacuum valves (2b) are arranged in one-to-one correspondence with the plurality of cavities (11).

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

5. The secondary battery leak detection device according to any one of claims 1-4, characterized in that, The number of the standard leak components (4a) is a plurality, the plurality of standard leak components (4a) are in one-to-one correspondence and communication with the cavities (11) of the plurality of pressure vessels (1), and a standard leak valve (4b) is provided between the standard leak component (4a) and the corresponding cavity (11).

6. The secondary battery leak detection device according to any one of claims 1-5, characterized in that, The pressure vessel (1) includes a fixed cavity (12) and a movable cavity (13), the fixed cavity (12) and the movable cavity (13) enclose to form the cavity (11), the fixed cavity (12) is fixedly arranged, the movable cavity (13) is movably arranged relative to the fixed cavity (12) so as to put the secondary battery into the movable cavity (13) or the fixed cavity (12) when the movable cavity (13) is separated from the fixed cavity (12), and the vacuum pumping device (2a), the leak detector (3a) and the standard leak component (4a) are all connected to the fixed cavity (12).

7. The secondary battery leak detection device according to claim 6, characterized in that, The secondary battery leak detection device (10) further includes a transfer module (5), which is connected to the movable cavity (13) and is used to drive the movable cavity (13) to move towards or away from the fixed cavity (12).

8. The secondary battery leak detection device according to any one of claims 1-7, characterized in that, One of the pressure vessels (1) has a plurality of the cavities (11), and the plurality of the cavities (11) are independent of each other.

9. The secondary battery leak detection device according to any one of claims 1-7, characterized in that, A vacuum breaking valve (6) is connected between the vacuum pumping device (2a) and the cavity (11).

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

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