Sealing performance detection device and manufacturing equipment of battery cell

Abstract

The utility model discloses a sealing performance detection device and manufacturing equipment of a battery monomer. The sealing performance detection device comprises a detection box, a negative pressure mechanism and a helium detection device. The detection box is provided with a containing bin which is used for containing the single batteries. The negative pressure mechanism communicates with the containing bin and is used for vacuumizing the containing bin. And the helium detection device is communicated with the accommodating bin. Wherein helium is contained in the battery single body, and the sealing performance detection device is used for detecting the helium leaked from the battery single body to the containing bin. According to the above structure, the sealing performance of the battery monomer can be detected, the influence of residual helium on the detection result in the helium filling process is reduced, and the detection efficiency and the detection accuracy are improved.

Description

Technical Field

[0001] 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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and energy storage systems, etc. Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, sodium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] During the production process of battery cells, the sealing test is an essential part. Usually, the water bubble method, the air bubble method, and the pressure drop method can be used for testing, but the above methods are not efficient. Therefore, how to improve the efficiency of the sealing test method of battery cells is also one of the research issues in this field. Utility Model Content

[0004] 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.

[0005] In a first aspect, the present application provides a sealing detection device, comprising a detection box, a negative pressure mechanism, and a helium detection device. The detection box has a storage chamber, which is used to store battery cells. The negative pressure mechanism is connected to the storage chamber, and the negative pressure mechanism is used to evacuate the storage chamber. The helium detection device is connected to the storage chamber. Among them, helium is contained inside the battery cell, and the sealing detection device is used to detect helium leaking from the battery cell into the storage chamber.

[0006] In the technical solution of the embodiment of the present application, a storage bin is provided to accommodate the 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 bin to improve the accuracy of the concentration detection of helium leaked from the battery cells. The helium detection device can detect the helium in the storage bin 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 detection efficiency and accuracy.

[0007] 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 bin. 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 sealing 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 detection, and the interference of external impurities is reduced. In addition, the opening is provided to facilitate the battery cells to enter and exit the storage bin, 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 bin, and improves the detection efficiency.

[0008] In some embodiments, the box body includes a support plate, the support plate is used to support the battery cell, and a protruding limit bar is provided on the support plate, and the limit bar is used to limit the displacement of the battery cell relative to the support plate. In the above structure, the battery cell is arranged in the box body, and the limit bar is arranged in the box body, which improves the stability of the battery cell and improves the detection efficiency and accuracy.

[0009] In some embodiments, a protrusion is provided on the movable plate, and a groove matching the protrusion is provided on the box body, and the movable plate and the box body are slidably connected through 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 opening and improves the detection efficiency.

[0010] 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 opening and improves the detection efficiency.

[0011] 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 of the movable plate. In the above structure, the battery cells are arranged on the movable plate, which can facilitate the movement of the battery cells, improve the convenience of placing the battery cells, and improve the efficiency of detection.

[0012] In some embodiments, the detection box further comprises a cylinder, which is arranged on the side of the box body away from the movable plate, and the cylinder can apply pressure to the box body toward the movable plate. In the above structure, by arranging the cylinder to squeeze the box body and the movable plate, the sealing between the movable plate and the box body can be improved, the risk of external impurities entering the containing chamber or the risk of helium leakage in the containing chamber can be reduced, and the accuracy of the detection can be improved.

[0013] 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 box body, and the vacuum valve is connected to the vacuum tube. In the above structure, the vacuum pump is highly efficient in vacuumizing the containing chamber, and the vacuum valve can control the vacuum pump's evacuation speed, thereby improving the efficiency of the vacuum process.

[0014] 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 box body, and the helium detection valve is connected to the helium detection tube. In the above structure, the helium mass spectrometer can accurately detect the leakage of helium in the storage bin, with high detection efficiency and high detection accuracy. The helium detection valve controls the connection and disconnection of the gas between the helium mass spectrometer and the storage bin, thereby improving the efficiency of detection.

[0015] In a second aspect, the present application provides a battery cell manufacturing device, including the sealing detection device in the above embodiment.

[0016] 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

[0017] Figure 1 A schematic diagram of the structure of a vehicle according to an embodiment of the present application;

[0018] Figure 2 This is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0019] Figure 3 A schematic diagram of the structure of a battery cell according to an embodiment of the present application;

[0020] Figure 4 This is a structural schematic diagram of a sealing detection device according to an embodiment of the present application;

[0021] Figure 5 This is a schematic structural diagram of a detection box of a sealing detection device according to an embodiment of the present application;

[0022] Figure 6 This is a front view structural diagram of a box body of a sealing detection device according to an embodiment of the present application;

[0023] Figure 7 This is a left-side structural schematic diagram of a detection box of a sealing detection device according to an embodiment of the present application;

[0024] Figure 8 This is a schematic structural diagram of a testing box of a sealing testing device according to another embodiment of the present application.

[0025] DETAILED DESCRIPTION OF REFERENCE NUMERALS

[0026] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Shell; 30. End cover; 40. Outer shell; 3. Controller; 4. Motor; 5. Box; 51. First part; 52. Second part; 53. Accommodation space; 6. Sealing detection device; 601. Detection box; 602. Negative pressure mechanism; 603. Helium detection device; 604. Support plate; 605. Limiting strip; 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. Accommodation compartment; 7. Battery cell. DETAILED DESCRIPTION

[0027] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field 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" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0029] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0030] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0031] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0032] 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).

[0033] 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. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0034] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0035] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0036] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0037] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. Vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, the head or the tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery 2 to power the motor 4, for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.

[0038] In some embodiments of the present application, the battery 2 can be used 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 .

[0039] In some embodiments, the battery 2 may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0040] Please refer to Figure 2 , Figure 2 The exploded diagram of the battery provided in some embodiments of the present application. The battery 2 includes a box body 5 and a battery cell 7, and the battery cell 7 is accommodated in the box body 5. The box body 5 is used to provide a storage space for the battery cell 7, and the box body 5 can adopt a variety of structures.

[0041] In some optional embodiments, the box body 5 includes a first part 51 and a second part 52, the first part 51 and the second part 52 cover each other, and the first part 51 and the second part 52 jointly define a storage space 53 for accommodating the battery cell 7. The second part 52 can be a hollow structure with one end open, and the first part 51 can be a plate-like structure, and the first part 51 covers the open side of the second part 52, so that the first part 51 and the second part 52 jointly define the storage space 53; the first part 51 and the second part 52 can also be hollow structures with one side open, and the open side of the first part 51 covers the open side of the second part 52. Of course, the box body 5 formed by the first part 51 and the second part 52 can be a variety of shapes, such as a cylinder, a cuboid, etc.

[0042] In some embodiments, the box 5 can be used as part of the chassis structure of the vehicle 1. For example, part of the box 5 can become at least a part of the floor of the vehicle 1, or part of the box 5 can become at least a part of the cross beam and longitudinal beam of the vehicle 1.

[0043] In the battery 2, there can be multiple battery cells 7, and the multiple battery cells 7 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 7 are both connected in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 7 is accommodated in the box 5. Of course, the battery 2 can also be a battery module formed by connecting multiple battery cells 7 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5. The battery 2 can also include other structures, for example, the battery 2 can also include a converging component for realizing the electrical connection between the multiple battery cells 7.

[0044] Each battery cell 7 may be a secondary battery or a primary battery, or a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 7 may be cylindrical, flat, rectangular or in other shapes.

[0045] Please refer to Figure 3 , Figure 3 The schematic diagram of the structure of a battery cell 7 provided in one embodiment of the present application. The battery cell 7 refers to the smallest unit constituting the battery 2. Figure 3 The battery cell 7 includes a housing 40, an electrode assembly 10 and other functional components.

[0046] The housing 40 is a component for accommodating the electrode assembly 10. The housing 40 has a housing cavity, and the electrode assembly can be arranged in the housing cavity. The housing 40 can be made of a variety of materials, such as copper, iron, aluminum, steel, and aluminum alloy. The housing 40 can be in a variety of shapes, such as a cylinder, a cuboid, etc. The housing 40 in the exemplary figure is a cylinder.

[0047] The housing 40 may include an end cap 30 and a shell 20. The end cap 30 refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 7 from the external environment. Without limitation, the shape of the end cap 30 may be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 30 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 30 is not easily deformed when squeezed and collided, so that the battery cell 7 can have a higher structural strength and the safety performance can also be improved.

[0048] In some embodiments, the end cap 30 may also be provided with a liquid injection hole, and a pressure relief mechanism is provided in the liquid injection hole to release the internal pressure. The material of the end cap 30 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions 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 circuit. Exemplarily, the insulating component may be plastic, rubber, etc.

[0049] The housing 20 is a component used to cooperate with the end cap 30 to form the internal environment of the battery cell 7. The formed internal environment can be used to accommodate the electrode assembly 10, the electrolyte and other components. The housing 20 and the end cap 30 can be independent components, and an opening can be set on the housing 20, and the internal environment of the battery cell 7 is formed by covering the opening with the end cap 30.

[0050] 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.

[0051] The electrode assembly 10 is a component in the battery cell 7 where electrochemical reactions occur. One or more electrode assemblies 10 may be included in 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 and removed back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow active ions to pass through.

[0052] In some embodiments, the separator is a separator. The present application has no particular restrictions on the type of separator, and any known porous separator with good chemical stability and mechanical stability can be selected. As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic.

[0053] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0054] In some embodiments, the battery cell 7 further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The present application has no specific restrictions on the type of electrolyte, which can be selected according to needs. The electrolyte can be liquid, gel or solid.

[0055] During the battery production process, it is necessary to test the sealing of the battery cell. Exemplarily, the end cap and the shell of the battery cell are connected by welding. In order to detect the airtightness of the welding, the sealing performance test of the battery cell needs to be performed. 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 helium inspection.

[0056] 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 interference from 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 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 detection efficiency and accuracy.

[0057] The following is a detailed description of the sealing detection device provided in the embodiment of the present application in conjunction with the accompanying drawings. Figures 4 to 6 , Figure 4 This is a schematic structural diagram of a sealing detection device according to an embodiment of the present application. Figure 5 This is a schematic diagram of the structure of a testing box of a sealing testing device according to an embodiment of the present application. Figure 6 This is a schematic diagram of the front view structure of the box body of a sealing detection device according to an embodiment of the present application.

[0058] like Figure 4 as well as Figure 5 As shown, 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, and the storage chamber 620 is used to store the battery cell 7. The negative pressure mechanism 602 is connected to the storage chamber 620, and the negative pressure mechanism 602 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.

[0059] 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 evacuate 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.

[0060] In the technical solution of the embodiment of the present application, a storage bin 620 is provided to accommodate the battery cell 7, thereby providing a stable detection environment for the sealing detection and reducing the interference of external impurities. The negative pressure mechanism 602 is used to discharge the gas in the storage bin 620, thereby improving the accuracy of the concentration detection of the helium leaked from the battery cell 7. The helium detection device 603 can detect the helium in the storage bin 620, and detect the helium leaked from the battery cell 7 during the detection, thereby improving the convenience of the detection. The above structure can perform a sealing test on the battery cell 7 after being filled with helium, thereby reducing the influence of the residual helium on the detection results during the helium filling process and improving the detection efficiency and accuracy.

[0061] In some optional embodiments, the containing chamber 620 can contain a plurality of battery cells 7, and the sealing properties of the plurality of battery cells 7 can be tested simultaneously, thereby improving the testing efficiency.

[0062] 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, the movable plate 607 covers the opening, and the movable plate 607 and the box body 606 are together enclosed to form a containing chamber 620. The sealing assembly 608 is arranged along the circumference of the opening, and the sealing assembly 608 is arranged between the movable plate 607 and the box body 606 to achieve sealing between the movable plate 607 and the box body 606.

[0063] like Figure 5 As shown, illustratively, the box body 606 may include a top plate 617 and a bottom plate 618 that are arranged opposite to each other, and also 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 are enclosed together to form a receiving compartment 620. The box body 606 of the above-mentioned cube-like structure is structurally stable, 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.

[0064] In the above structure, by arranging the box body 606 to accommodate the battery cell 7, a stable detection environment is provided for the sealing detection, and the interference of external impurities is reduced. In addition, an opening is provided to facilitate the battery cell 7 to enter and exit the storage chamber 620, thereby improving the detection efficiency of the battery cell 7. The sealing assembly 608 improves the sealing between the box body 606 and the movable plate 607, reduces the risk of external gas entering the storage chamber 620, and improves the detection efficiency.

[0065] like Figure 5 As shown, in some embodiments of the present application, the box body 606 includes a support plate 604, and illustratively, the support plate 604 can be a bottom plate 618. The support plate 604 is used to support the battery cell 7, and a protruding limit bar 605 is provided on the support plate 604, and 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 arranged in the box body 606, and the limit bar 605 is arranged in the box body 606, which improves the stability of the battery cell 7 and improves the detection efficiency and accuracy.

[0066] 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 understandable that a limiting structure matching the bottom structure of the battery cell 7 can be provided on the support plate 604, thereby improving the efficiency of installing the battery cell 7 into the receiving chamber 620 and improving the stability of the detection process.

[0067] like Figure 6 as well as Figure 7 As shown, in some embodiments of the present application, a protrusion 609 is provided on the movable plate 607, and a groove 610 matching 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. In the above structure, the movable plate 607 is slidably connected with the box body 606 by providing the protrusion 609 and the groove 610, which facilitates the opening and closing of the box body 606, thereby improving the detection efficiency.

[0068] In some embodiments of the present application, one side of the movable plate 607 is hinged to the box body 606. Exemplarily, the movable plate 607 and the box body 606 can be connected by a shutter hinge. In the above technical solution, the movable plate 607 is hinged to the box body 606, which facilitates the opening and closing of the box body 606 and improves the detection efficiency.

[0069] like Figure 8As shown, in some embodiments of the present application, the movable plate 607 is used to support the battery cell 7, and the box body 606 is covered on the movable plate 607 from one side of the movable plate 607. In the above structure, the battery cell 7 is arranged on the movable plate 607, which can facilitate the movement of the battery cell 7, improve the convenience of placing the battery cell 7, and improve the efficiency of detection.

[0070] 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 away from the movable plate 607, and the cylinder can apply pressure to the box body 606 toward the movable plate 607. Exemplarily, the support plate 604 can be disposed on a base, and 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 the sealing is improved.

[0071] 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.

[0072] like Figure 4 As shown, 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 vacuumizing the containing chamber 620, and the vacuum valve 613 can control the vacuum pump 611's evacuation speed, thereby improving the efficiency of the vacuum process.

[0073] 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 box body 606, and the helium detection valve 616 is connected to the helium detection tube 615. In the above structure, the helium mass spectrometer 614 can accurately detect the leakage of helium in the containing chamber 620, with high detection efficiency and high detection accuracy. The helium detection valve 616 controls the connection and disconnection of the gas between the helium mass spectrometer 614 and the containing chamber 620, thereby improving the efficiency of detection.

[0074] 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 setting a containing 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 containing chamber 620 to improve 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 containing chamber 620, and detect the helium leaked from the battery cell 7 during the detection, 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 result during the helium filling process, and improve the detection efficiency and accuracy.

[0075] 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 replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate 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 detection device (6), characterized in that: include: A testing box (601) having a containing chamber (620), wherein the containing chamber (620) is used to contain a battery cell (7); A negative pressure mechanism (602) is in communication with the containing chamber (620), and the negative pressure mechanism (602) is used to evacuate the containing chamber (620); a helium detection device (603), which is in communication with the containing chamber (620), 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 containing chamber (620).

2. The sealing detection device (6) according to claim 1, characterized in that: The detection box (601) comprises: A box body (606) having an opening; A movable plate (607) covers the opening, and the movable plate (607) and the box body (606) together enclose the containing chamber (620); A sealing component (608) is arranged along the circumference of the opening. The sealing component (608) is arranged between the movable plate (607) and the box body (606) to achieve sealing between the movable plate (607) and the box body (606).

3. The sealing detection device (6) according to claim 2, characterized in that: The box body (606) comprises a support plate (604), the support plate (604) being used to support the battery cell (7), the support plate (604) being provided with a protruding limit bar (605), the limit bar (605) being used to limit the displacement of the battery cell (7) relative to the support plate (604).

4. The sealing detection device (6) according to claim 2, characterized in that: The movable plate (607) is provided with a protrusion (609), and the box body (606) is provided with a groove (610) that matches the protrusion (609). The movable plate (607) and the box body (606) are slidably connected via the protrusion (609) and the groove (610).

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

6. The sealing detection device (6) according to claim 2, characterized in that: The movable plate (607) is used to support the battery cell (7), and the box body (606) is covered on the movable plate (607) from one side of the movable plate (607).

7. The sealing detection device (6) according to claim 6, characterized in that: The detection box (601) further comprises a cylinder, which is arranged on a side of the box body (606) away from the movable plate (607), and the cylinder is capable of applying pressure to the box body (606) towards the movable plate (607).

8. The sealing detection device (6) according to any one of claims 2 to 7, characterized in that: The negative pressure mechanism (602) comprises: Vacuum pump (611); A vacuum tube (612) connected to the vacuum pump (611) and the box body (606); The vacuum valve (613) is connected to the vacuum tube (612).

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

10. A battery cell (7) manufacturing device, characterized in that: The manufacturing equipment of the battery cell (7) comprises the sealing detection device (6) according to any one of claims 1 to 9.

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