Sealing performance testing device and battery cell manufacturing apparatus

Abstract

The present application discloses a sealing performance testing device and a battery cell manufacturing apparatus. The sealing performance testing device comprises a test chamber, a negative pressure mechanism and a helium leak detection device. The test chamber comprises an accommodation compartment, and the accommodation compartment is used for accommodating battery cells. The negative pressure mechanism is communicated with the accommodation compartment, and the negative pressure mechanism is used for vacuumizing the accommodation compartment. The helium leak detection device is communicated with the accommodation compartment. Helium is contained in the battery cells, and the sealing performance testing device is used for detecting helium leaking into the accommodation compartment from the battery cells. The above structure allows for sealing performance testing of battery cells, reduces the impact of residual helium after a helium filling process on test results, and improves the testing efficiency and accuracy.

Description

Sealing detection device and battery cell manufacturing equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202323592084.6, filed on December 27, 2023, entitled “Sealing Detection Device and Battery Cell Manufacturing Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and in particular to a sealing detection device and a manufacturing device for battery cells. Background Art

[0004] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric bicycles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes, power tools, and energy storage systems. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells.

[0005] Testing the sealing properties of battery cells is an essential step in the production process. Common methods for testing include the water bubble method, the air bubble method, and the pressure drop method, but these methods are inefficient. Therefore, improving the efficiency of battery cell sealing testing methods is a research topic in this field.

[0006] Summary of the Invention

[0007] In view of the above problems, the present application provides a sealing detection device and a battery cell manufacturing device, which can improve the efficiency and test accuracy of battery cell sealing detection.

[0008] In a first aspect, the present application provides a leak detection device comprising a test box, a negative pressure mechanism, and a helium detection device. The test box has a storage compartment for accommodating battery cells. The negative pressure mechanism is in communication with the storage compartment and is used to evacuate the storage compartment. The helium detection device is in communication with the storage compartment. The battery cells contain helium, and the leak detection device is used to detect helium leaking from the battery cells into the storage compartment.

[0009] In the technical solution of the embodiment of the present application, a storage chamber is provided to accommodate battery cells, thereby providing a stable testing environment for sealing detection and reducing interference from external impurities. The negative pressure mechanism is used to discharge the gas in the storage chamber, thereby improving the accuracy of the concentration detection of helium leaked from the battery cells. The helium detection device can detect the helium in the storage chamber and detect the helium leaked from the battery cells during the detection period, thereby improving the convenience of detection. The above structure can perform sealing detection on the battery cells after helium filling, reduce the influence of residual helium on the detection results during the helium filling process, and improve the efficiency and accuracy of the detection.

[0010] In some embodiments, the detection box includes a box body, a movable plate and a sealing assembly. The box body has an opening, the movable plate covers the opening, and the movable plate and the box body together enclose a storage chamber. The sealing assembly is arranged along the circumference of the opening, and the sealing assembly is arranged between the movable plate and the box body to achieve a seal between the movable plate and the box body. In the above structure, by arranging the box body to accommodate the battery cells, a stable detection environment is provided for the sealing test, and the interference of external impurities is reduced. In addition, an opening is provided to facilitate the battery cells to enter and exit the storage chamber, thereby improving the detection efficiency of the battery cells. The sealing assembly improves the sealing between the box body and the movable plate, reduces the risk of external gas entering the storage chamber, and improves the detection efficiency.

[0011] In some embodiments, the box body includes a support plate for supporting the battery cells, and a protruding limit bar is provided on the support plate to limit the displacement of the battery cells relative to the support plate. In the above structure, the battery cells are placed in the box body and the limit bar is provided in the box body, which improves the stability of the battery cells and enhances the efficiency and accuracy of detection.

[0012] In some embodiments, the movable plate is provided with a protrusion, and the box body is provided with a groove that cooperates with the protrusion, and the movable plate and the box body are slidably connected via the protrusion and the groove. In the above structure, the movable plate is slidably connected to the box body by providing the protrusion and the groove, which facilitates the opening and closing of the box body and improves the detection efficiency.

[0013] In some embodiments, one side of the movable plate is hinged to the box body. In the above technical solution, the movable plate is hinged to the box body, which facilitates the opening and closing of the box body and improves the detection efficiency.

[0014] In some embodiments, the movable plate is used to support the battery cells, and the box body is covered on the movable plate from one side. In the above structure, placing the battery cells on the movable plate can facilitate the movement of the battery cells, improve the convenience of placing the battery cells, and improve the efficiency of detection.

[0015] In some embodiments, the detection box further includes a cylinder, located on a side of the box body facing away from the movable plate. The cylinder is capable of applying pressure to the box body toward the movable plate. In this configuration, by providing the cylinder to compress the box body and the movable plate, the seal between the movable plate and the box body can be improved, reducing the risk of external impurities entering the containment chamber or the risk of helium leaking from the containment chamber, thereby improving detection accuracy.

[0016] In some embodiments, the negative pressure mechanism includes a vacuum pump, a vacuum tube, and a vacuum valve. The vacuum tube is connected to the vacuum pump and the chamber body, and the vacuum valve is connected to the vacuum tube. In the above structure, the vacuum pump is highly efficient in evacuating the chamber, and the vacuum valve can control the vacuum pump's pumping speed, thereby improving the efficiency of the vacuum process.

[0017] In some embodiments, the helium detection device includes a helium mass spectrometer, a helium detection tube, and a helium detection valve. The helium detection tube is connected between the helium mass spectrometer and the chamber body, and the helium detection valve is connected to the helium detection tube. In this configuration, the helium mass spectrometer can accurately detect helium leaks in the containment chamber, with high detection efficiency and accuracy. The helium detection valve controls the flow of gas between the helium mass spectrometer and the containment chamber, improving detection efficiency.

[0018] In a second aspect, the present application provides a battery cell manufacturing device, including the sealing detection device in the above embodiment.

[0019] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

[0021] FIG2 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0022] FIG3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0023] FIG4 is a schematic structural diagram of a sealing detection device according to an embodiment of the present application;

[0024] FIG5 is a schematic structural diagram of a testing box of a sealing testing device according to an embodiment of the present application;

[0025] FIG6 is a front view of the box body of the sealing detection device according to one embodiment of the present application;

[0026] FIG7 is a schematic diagram of the left side structure of a testing box of a sealing testing device according to one embodiment of the present application;

[0027] FIG8 is a schematic structural diagram of a testing box of a sealing testing device according to another embodiment of the present application.

[0028] Detailed description of the accompanying drawings: 1. vehicle; 2. battery; 10. electrode assembly; 20. shell; 30. end cover; 40. outer shell; 3. controller; 4. motor; 5. box body; 51. first part; 52. second part; 53. accommodating space; 6. sealing detection device; 601. detection box; 602. negative pressure mechanism; 603. helium detection device; 604. support plate; 605. limit bar; 606. box body; 607. movable plate; 608. sealing assembly; 609. protrusion; 610. groove; 611. vacuum pump; 612. vacuum tube; 613. vacuum valve; 614. helium mass spectrometer; 615. helium detection tube; 616. helium detection valve; 617. top plate; 618. bottom plate; 619. side plate; 620. accommodating compartment; 7. battery cell. DETAILED DESCRIPTION

[0029] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0031] In the description of the embodiments of this application, the technical terms "first" and "second" are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise clearly and specifically defined.

[0032] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0033] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0034] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0035] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0036] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connected," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0037] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0038] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0039] Please refer to Figure 1, which is a schematic diagram of the structure of the vehicle provided in some embodiments of the present application. Vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 2 is provided inside the vehicle 1, and the battery 2 can be provided at the bottom, head or tail of the vehicle 1. The battery 2 can be used to power the vehicle 1. For example, the battery 2 can serve as an operating power source for the vehicle 1. The vehicle 1 can also include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0040] In some embodiments of the present application, the battery 2 can serve not only as an operating power source for the vehicle 1 , but also as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0041] In some embodiments, the battery 2 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0042] Please refer to Figure 2, which is an exploded view of a battery provided in some embodiments of the present application. Battery 2 includes a housing 5 and a battery cell 7, with battery cell 7 housed within housing 5. Housing 5 is used to accommodate battery cell 7 and can adopt a variety of structures.

[0043] In some optional embodiments, the housing 5 includes a first portion 51 and a second portion 52, which cover each other and together define a storage space 53 for accommodating the battery cells 7. The second portion 52 may be a hollow structure with one end open, and the first portion 51 may be a plate-like structure, with the first portion 51 covering the open side of the second portion 52, so that the first portion 51 and the second portion 52 together define the storage space 53. The first portion 51 and the second portion 52 may also be hollow structures with one end open, with the open side of the first portion 51 covering the open side of the second portion 52. Of course, the housing 5 formed by the first portion 51 and the second portion 52 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0044] In some embodiments, the box 5 can serve as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least part of the floor of the vehicle 1, or part of the box 5 can become at least part of the crossbeam and longitudinal beam of the vehicle 1.

[0045] In battery 2, there may be multiple battery cells 7, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections among the multiple battery cells 7. Multiple battery cells 7 may be directly connected in series, in parallel, or in a hybrid configuration, and the entire structure of the multiple battery cells 7 may then be housed within the housing 5. Alternatively, battery 2 may comprise multiple battery cells 7 connected in series, in parallel, or in a hybrid configuration to form a battery module, which is then further connected in series, in parallel, or in a hybrid configuration to form a single structure housed within the housing 5. Battery 2 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 7.

[0046] Each battery cell 7 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 7 can be cylindrical, flat, rectangular, or in other shapes.

[0047] Please refer to Figure 3, which is a schematic diagram of the structure of a battery cell 7 provided in one embodiment of the present application. A battery cell 7 is the smallest unit that makes up a battery 2. As shown in Figure 3, a battery cell 7 includes a housing 40, an electrode assembly 10, and other functional components.

[0048] The housing 40 is a component for accommodating the electrode assembly 10. The housing 40 has a cavity in which the electrode assembly can be placed. The housing 40 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloys. The housing 40 can have a variety of shapes, such as a cylinder or a rectangular parallelepiped. The exemplary housing 40 in the figure is cylindrical.

[0049] The housing 40 may include an end cap 30 and a shell 20. The end cap 30 is a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. The shape of the end cap 30 can be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 can be made of a material with a certain hardness and strength (such as aluminum alloy). This makes the end cap 30 less likely to deform when subjected to compression or collision, thereby providing the battery cell 7 with greater structural strength and improved safety performance.

[0050] In some embodiments, the end cap 30 may also be provided with an injection hole, in which a pressure relief mechanism is provided to relieve internal pressure. The end cap 30 may also be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitation on this. In some embodiments, an insulating component may also be provided on the inner side of the end cap 30 to reduce the risk of short circuits. Exemplary, the insulating component may be plastic, rubber, etc.

[0051] The housing 20 is a component that cooperates with the end caps 30 to form the internal environment of the battery cell 7. This internal environment can accommodate the electrode assembly 10, electrolyte, and other components. The housing 20 and end caps 30 can be separate components. An opening can be provided in the housing 20, and the end caps 30 can be placed over the opening to form the internal environment of the battery cell 7.

[0052] In some optional embodiments, the end cap 30 and the shell 20 can also be integrated. Specifically, the end cap 30 and the shell 20 can form a common connection surface before other components are put into the shell. When the interior of the shell 20 needs to be encapsulated, the end cap 30 is covered with the shell 20. The shell 20 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 20 can be determined according to the specific shape and size of the electrode assembly 10. The material of the shell 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not impose any special restrictions on this.

[0053] The electrode assembly 10 is the component in the battery cell 7 where the electrochemical reaction occurs. One or more electrode assemblies 10 may be contained within the housing 20. The electrode assembly 10 includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell 7, active ions (such as lithium ions) are embedded in and released from the positive and negative electrodes. The separator is provided between the positive and negative electrodes to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0054] In some embodiments, the separator is a separator. This application does not specifically limit the type of separator; any known porous separator with good chemical and mechanical stability can be used. For example, the separator can be made primarily of at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0055] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0056] In some embodiments, the battery cell 7 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte may be selected based on needs. The electrolyte may be liquid, gel, or solid.

[0057] During the battery production process, it is necessary to test the sealing of the battery cell. For example, the end cap and the shell of the battery cell are connected by welding. In order to test the airtightness of the welding, the sealing performance test of the battery cell needs to be carried out. Alternatively, when the end cap and the shell of the battery cell are an integrated structure, the end cap needs to be tested for airtightness. The airtightness test is aimed at the sealing between the components on the end cap and the end cap. The conventional helium inspection process may include filling the battery cell with helium at the inspection position, then sealing the battery cell, and finally conducting a helium leak test on it. In the above-mentioned inspection method, the helium filling and helium inspection functions of the battery cell are concentrated in series in one station, and the equipment structure is complex. The helium inspection station requires a long time, the station utilization rate is low, and the helium inspection efficiency is low. In addition, the battery cell needs to be sealed, vacuumed and filled with helium in the helium inspection chamber, which will increase the impact of residual helium in the helium filling process on the inspection results and reduce the efficiency of the helium inspection.

[0058] In response to the above-mentioned problems, an embodiment of the present application provides a sealing detection device, which can accommodate battery cells by providing a storage chamber to provide a stable detection environment for sealing detection and reduce the interference of external impurities. The negative pressure mechanism is used to discharge the gas in the storage chamber to improve the accuracy of the concentration detection of helium leaked from the battery cell. The helium detection device can detect the helium in the storage chamber and detect the helium leaked from the battery cell during the detection period, thereby improving the convenience of detection. The above structure can perform sealing detection on the battery cell after helium filling, reduce the influence of residual helium on the detection results during the helium filling process, and improve the efficiency and accuracy of the detection.

[0059] The following is a detailed description of the sealing detection device provided in an embodiment of the present application in conjunction with the accompanying drawings. Please refer to Figures 4 to 6. Figure 4 is a schematic structural diagram of the sealing detection device according to an embodiment of the present application. Figure 5 is a schematic structural diagram of the detection box of the sealing detection device according to an embodiment of the present application. Figure 6 is a schematic structural diagram of the box body of the sealing detection device according to an embodiment of the present application from a front view.

[0060] As shown in Figures 4 and 5, the sealing detection device 6 of the embodiment of the present application includes: a detection box 601, a negative pressure mechanism 602, and a helium detection device 603. The detection box 601 has a storage chamber 620, which is used to accommodate the battery cell 7. The negative pressure mechanism 602 is connected to the storage chamber 620 and is used to evacuate the storage chamber 620. The helium detection device 603 is connected to the storage chamber 620. Among them, the battery cell 7 contains helium, and the sealing detection device 6 is used to detect helium leaking from the battery cell 7 into the storage chamber 620.

[0061] The steps of using the sealing detection device 6 provided in the embodiment of the present application to detect the sealing performance of the battery cell 7 are as follows: install the battery cell 7 and fill the shell 20 with helium; send the battery cell 7 filled with helium to the receiving chamber 620 of the detection box 601, and seal the detection box 601; turn on the negative pressure mechanism 602 to vacuum the receiving chamber 620 and leave it for a period of time; use the helium detection device 603 to detect the helium concentration in the receiving chamber 620. If the helium concentration is within the preset range, it means that the sealing of the battery cell 7 meets the requirements. If the helium concentration exceeds the preset range, it means that the sealing of the battery cell 7 does not meet the requirements.

[0062] In the technical solution of the embodiment of the present application, a storage chamber 620 is provided to accommodate the battery cell 7, thereby providing a stable detection environment for sealing detection and reducing interference from external impurities. The negative pressure mechanism 602 is used to discharge the gas in the storage chamber 620, thereby improving the accuracy of the concentration detection of helium leaked from the battery cell 7. The helium detection device 603 is capable of detecting the helium in the storage chamber 620 and detecting the helium leaked from the battery cell 7 during the detection period, thereby improving the convenience of detection. The above structure can perform sealing detection on the battery cell 7 after helium filling, reduces the influence of residual helium on the detection results during the helium filling process, and improves the efficiency and accuracy of the detection.

[0063] In some optional embodiments, the accommodating chamber 620 can accommodate multiple battery cells 7, and the sealing performance of multiple battery cells 7 can be tested simultaneously, thereby improving the testing efficiency.

[0064] In some embodiments of the present application, the detection box 601 includes a box body 606, a movable plate 607, and a sealing assembly 608. The box body 606 has an opening, and the movable plate 607 covers the opening. The movable plate 607 and the box body 606 together enclose a storage chamber 620. The sealing assembly 608 is arranged along the circumference of the opening and is disposed between the movable plate 607 and the box body 606 to achieve a seal between the movable plate 607 and the box body 606.

[0065] As shown in FIG5 , illustratively, the box body 606 may include a top plate 617 and a bottom plate 618 that are arranged opposite to each other, and further include a plurality of side plates 619 connected between the top plate 617 and the bottom plate 618, and two adjacent side plates 619 are connected to each other. The top plate 617, the bottom plate 618 and the plurality of side plates 619 together enclose a storage compartment 620. The box body 606 with the above-mentioned cube-like structure has a stable structure, is easy to manufacture, and has a large internal volume, which improves the efficiency of the sealing detection of the battery cell 7. The sealing component 608 can be foam cotton or a sealing strip, etc.

[0066] In the above structure, the box body 606 is provided to accommodate the battery cells 7, providing a stable testing environment for sealing, reducing interference from external impurities. Furthermore, an opening is provided to facilitate the entry and exit of the battery cells 7 into the storage compartment 620, thereby improving the efficiency of testing the battery cells 7. The sealing assembly 608 improves the seal between the box body 606 and the movable plate 607, reducing the risk of external air entering the storage compartment 620 and improving testing efficiency.

[0067] As shown in FIG5 , in some embodiments of the present application, the box body 606 includes a support plate 604. Exemplarily, the support plate 604 may be a bottom plate 618. The support plate 604 is used to support the battery cell 7. A protruding limit bar 605 is provided on the support plate 604. The limit bar 605 is used to limit the displacement of the battery cell 7 relative to the support plate 604. Optionally, a detection position of the battery cell 7 is formed between two adjacent limit bars 605 to limit the movement of the battery cell 7. In the above structure, the battery cell 7 is disposed in the box body 606, and the limit bar 605 is provided in the box body 606, which improves the stability of the battery cell 7 and improves the detection efficiency and accuracy.

[0068] In some optional embodiments, the support plate 604 is provided with an annular protrusion for limiting the displacement of the cylindrical battery cell 7. It is understood that the support plate 604 can be provided with a limiting structure that matches the bottom structure of the battery cell 7, thereby improving the efficiency of installing the battery cell 7 into the storage compartment 620 and enhancing the stability of the detection process.

[0069] As shown in Figures 6 and 7, in some embodiments of the present application, a protrusion 609 is provided on the movable plate 607, and a groove 610 is provided on the box body 606 to cooperate with the protrusion 609. The movable plate 607 and the box body 606 are slidably connected via the protrusion 609 and the groove 610. In the above structure, the movable plate 607 is slidably connected to the box body 606 by providing the protrusion 609 and the groove 610, which facilitates the opening and closing of the box body 606 and improves the detection efficiency.

[0070] In some embodiments of the present application, one side of the movable panel 607 is hinged to the box body 606. For example, the movable panel 607 and the box body 606 can be connected by a shutter hinge. In the above technical solution, the hinged connection between the movable panel 607 and the box body 606 facilitates the opening and closing of the box body 606, thereby improving detection efficiency.

[0071] As shown in FIG8 , in some embodiments of the present application, a movable plate 607 is used to support the battery cells 7, and the box body 606 is mounted on the movable plate 607 from one side thereof. In the above structure, placing the battery cells 7 on the movable plate 607 facilitates the movement of the battery cells 7, improves the convenience of placing the battery cells 7, and enhances the efficiency of detection.

[0072] In some embodiments of the present application, the detection box 601 further includes a cylinder, which is disposed on a side of the box body 606 facing away from the movable plate 607. The cylinder can apply pressure to the box body 606 toward the movable plate 607. For example, the support plate 604 can be disposed on a base. When the cylinder applies a downward force to the box body 606, the connection stability between the box body 606 and the support plate 604 is improved, while also improving the sealing performance.

[0073] In the above structure, by setting a cylinder to squeeze the box body 606 and the movable plate 607, the sealing between the movable plate 607 and the box body 606 can be improved, the risk of external impurities entering the containing chamber 620 or the helium in the containing chamber 620 leaking can be reduced, and the accuracy of detection can be improved.

[0074] As shown in FIG4 , in some embodiments of the present application, the negative pressure mechanism 602 includes a vacuum pump 611, a vacuum tube 612, and a vacuum valve 613. The vacuum tube 612 is connected to the vacuum pump 611 and the box body 606, and the vacuum valve 613 is connected to the vacuum tube 612. In the above structure, the vacuum pump 611 is highly efficient in vacuuming the storage chamber 620, and the vacuum valve 613 can control the pumping speed of the vacuum pump 611, thereby improving the efficiency of the vacuum process.

[0075] In some embodiments of the present application, the helium detection device 603 includes a helium mass spectrometer 614, a helium detection tube 615, and a helium detection valve 616. The helium detection tube 615 is connected between the helium mass spectrometer 614 and the housing 606, and the helium detection valve 616 is connected to the helium detection tube 615. In this structure, the helium mass spectrometer 614 can accurately detect helium leaks in the storage chamber 620, with high detection efficiency and accuracy. The helium detection valve 616 controls the connection and disconnection of gas between the helium mass spectrometer 614 and the storage chamber 620, improving detection efficiency.

[0076] The embodiment of the present application also provides a manufacturing device for a battery cell 7, including the sealing detection device 6 in the above embodiment. In the manufacturing device for the battery cell 7 in the embodiment of the present application, the battery cell 7 can be accommodated by providing a accommodating chamber 620, providing a stable detection environment for sealing detection and reducing the interference of external impurities. The negative pressure mechanism 602 is used to discharge the gas in the accommodating chamber 620, thereby improving the accuracy of the concentration detection of helium leaked from the battery cell 7. The helium detection device 603 can detect the helium in the accommodating chamber 620, and detect the helium leaked from the battery cell 7 during the detection period, thereby improving the convenience of detection. The above structure can perform sealing detection on the battery cell 7 after helium filling, reduce the influence of residual helium on the detection results during the helium filling process, and improve the efficiency and accuracy of detection.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application 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 make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A sealing performance detection device (6), comprising: A detection box (601) having a receiving chamber (620) for receiving a battery cell (7); A negative pressure mechanism (602) communicating with the receiving chamber (620) for evacuating the receiving chamber (620); A helium detection device (603) communicating with the receiving chamber (620), wherein helium gas is contained inside the battery cell (7), and the sealing performance detection device (6) is used to detect the helium gas leaking from the battery cell (7) into the receiving chamber (620).

2. The sealing performance detection device (6) according to claim 1, wherein, The detection box (601) includes: A box body (606) having an opening; A movable plate (607) covering the opening, and the movable plate (607) and the box body (606) together enclose the receiving chamber (620); A sealing assembly (608) disposed along the circumference of the opening, and the sealing assembly (608) is disposed between the movable plate (607) and the box body (606) for achieving sealing between the movable plate (607) and the box body (606).

3. The sealing detection device (6) according to claim 2, wherein, The box body (606) includes a support plate (604) for supporting the battery cell (7), and a protruding limit strip (605) is provided on the support plate (604) for restricting the displacement of the battery cell (7) relative to the support plate (604).

4. The sealing detection device (6) according to claim 2, wherein, A protrusion (609) is provided on the movable plate (607), and a groove (610) cooperating with the protrusion (609) is provided on the box body (606), and the movable plate (607) and the box body (606) are slidably connected through the protrusion (609) and the groove (610).

5. The sealing detection device (6) according to claim 2, wherein, One side of the movable plate (607) is hinged to the box body (606).

6. The sealing detection device (6) according to claim 2, wherein, The movable plate (607) is used to support the battery cell (7), and the box body (606) covers the movable plate (607) from one side of the movable plate (607).

7. The sealing performance detection device (6) according to claim 6, wherein, The detection box (601) further includes a cylinder disposed on a side of the box body (606) facing away from the movable plate (607), and the cylinder can apply a pressure to the box body (606) towards the movable plate (607).

8. The sealing performance detection device (6) according to any one of claims 2-7, wherein, The negative pressure mechanism (602) includes: A vacuum pump (611); A vacuum tube (612) connected to the vacuum pump (611) and the box body (606); A vacuum valve (613) connected to the vacuum tube (612).

9. The sealing detection device (6) according to any one of claims 2-7, wherein, The helium detection device (603) includes: A helium mass spectrometer (614); A helium detection tube (615) connected to the helium mass spectrometer (614) and the box body (606); A helium detection valve (616) connected to the helium detection tube (615).

10. A manufacturing device for a battery cell (7), the manufacturing device for the battery cell (7) including the sealing performance detection device (6) according to any one of claims 1-9.

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