Exhaust device and battery monomer formation equipment

Abstract

The utility model discloses an exhaust device and battery monomer formation equipment. The exhaust device comprises an exhaust pipeline and a defoaming assembly, the exhaust pipeline is used for being connected with the liquid injection hole of the battery monomer, and the exhaust pipeline is communicated with the accommodating cavity of the battery monomer so as to release gas in the battery monomer. The defoaming assembly is connected to one end, facing the battery monomers, of the exhaust pipeline, and a plurality of defoaming holes are formed in the defoaming assembly and are used for reducing electrolyte foams in the accommodating cavity from overflowing from the liquid injection hole. And the exhaust pipeline is arranged to exhaust gas generated in the formation process, so that the risk that the shell is deformed or the pressure relief mechanism is started in advance due to gas accumulation in the battery monomer is reduced, and the stability of the battery monomer formation process is improved. The defoaming meshes are arranged to filter foams in the battery monomer, so that the risk that the foams overflow from the shell and remain on the shell is reduced, gas is allowed to be discharged, electrode liquid residues on the surface of the battery monomer are reduced, the stability of the battery monomer in the operation process is improved, and the waste of electrolyte is reduced.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to an exhaust device and a battery monomer formation device. Background Art

[0002] Batteries are widely used in various electronic devices, such as mobile phones, laptops, electric vehicles, electric aircraft, electric ships, electric toy cars, electric toy aircraft, electric toy ships, power tools and energy storage systems, etc.

[0003] With the development of battery technology, how to improve the operating stability 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 an exhaust device and a battery cell formation equipment, which can reduce the overflow of electrolyte during the battery cell formation process, reduce the risk of short circuit on the battery cell surface, improve the stability of battery cell operation, and reduce electrolyte waste.

[0005] In a first aspect, the present application provides an exhaust device comprising an exhaust duct and a defoaming assembly. The exhaust duct is connected to the injection hole of a battery cell and communicates with the storage cavity of the battery cell to release gas from the battery cell. The defoaming assembly is connected to the end of the exhaust duct facing the battery cell and is provided with a plurality of defoaming holes, which are used to reduce the leakage of electrolyte foam in the storage cavity from the injection hole.

[0006] In the technical solution of the embodiments of this application, an exhaust duct is provided to discharge the gases generated during the formation process, reducing the risk of gas accumulation within the battery cell causing deformation of the outer shell or premature activation of the pressure relief mechanism, thereby improving the stability of the battery cell formation process. A defoaming mesh is provided to filter the foam in the battery cell, reducing the risk of foam overflowing from the outer shell and remaining on the outer shell. Only gas is allowed to be discharged, reducing the residual electrode liquid on the surface of the battery cell, improving the stability of the battery cell operation process, and reducing electrolyte waste.

[0007] In some embodiments, the exhaust device further includes a sealing plug that is sealed to the exhaust duct and has a vent hole formed therein for exhausting gas from within the battery cell. The provision of the sealing plug further reduces the risk of electrode liquid leakage, and the provision of the vent hole ensures smooth exhaust of gas.

[0008] In some embodiments, the cross-sectional area of ​​the sealing plug gradually increases along the direction of the accommodating cavity toward the exhaust pipe. The above structure can reduce the risk of electrolyte overflow.

[0009] In some embodiments, a sealing ring is further provided on the periphery of the exhaust duct to seal the exhaust duct with the outer casing of the battery cell. The provision of the sealing ring improves the sealing performance between the exhaust duct and the outer casing of the battery cell, reducing the risk of electrolyte leaking into the outer casing and remaining on the surface of the battery cell during the battery cell formation process.

[0010] In some embodiments, the defoaming assembly includes a defoaming tube connected to one end of the exhaust duct facing the accommodating chamber, and having a plurality of first defoaming holes formed therein. In the above structure, by providing the defoaming tube, the first defoaming holes can filter foam from the gas-liquid mixture in the electrolyte, reducing the risk of liquid overflow while allowing gas to escape, reducing gas accumulation within the battery cells, and improving the stability of the formation process.

[0011] In some embodiments, the defoaming tube includes a connecting section and a tip portion. The connecting section is connected to the end of the exhaust duct and extends axially along the exhaust duct. The tip portion is connected to the end of the connecting section away from the exhaust duct. The cross-sectional area of ​​the tip portion gradually decreases along the exhaust duct toward the connecting section. The connecting section and the tip portion are both provided with a first defoaming hole. In the above structure, by providing the connecting section, the surface area of ​​the defoaming tube is increased, thereby improving the efficiency of foam filtration in the electrolyte. The tip portion is provided to facilitate the defoaming tube to enter the interior of the battery cell.

[0012] In some embodiments, the defoaming assembly further comprises a defoaming net, which is disposed between the defoaming pipe and the exhaust pipe and has a plurality of second defoaming holes. The defoaming net further filters the foam in the electrode solution, thereby improving the efficiency of foam filtration.

[0013] In some embodiments, the defoaming tube is any one of an iron tube, a copper tube, an aluminum alloy tube, or a steel tube, and the defoaming mesh is any one of an iron mesh, a copper mesh, an aluminum alloy mesh, or a steel mesh. The above structure has high structural strength and strong corrosion resistance, which can improve the defoaming efficiency.

[0014] In some embodiments, the diameter D of the first defoaming hole is: 0.1 mm ≤ D ≤ 5 mm. The above structure is similar to the shape of the foam, which improves the efficiency of filtering the foam.

[0015] In a second aspect, the present application provides a battery monomer formation device, which includes the exhaust 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] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0018] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0019] Figure 2 A schematic diagram of the exploded structure of a battery provided in some embodiments of the present application;

[0020] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application;

[0021] Figure 4 A schematic diagram of the structure of an exhaust device provided in some embodiments of the present application;

[0022] Figure 5 A schematic structural diagram of an exhaust device provided in some other embodiments of the present application;

[0023] Figure 6 A schematic structural diagram of an exhaust device provided in some other embodiments of the present application;

[0024] Figure 7 Schematic diagram of the structure of the exhaust device provided in some further embodiments of the present application.

[0025] Detailed description of reference numerals:

[0026] 1. Vehicle; 2. Battery; 10. Electrode assembly; 20. Shell; 24. Pressure relief mechanism; 30. End cap; 31. Liquid injection hole; 40. Outer shell; 3. Controller; 4. Motor; 5. Box; 51. First box part; 52. Second box part; 53. Accommodation space; 6. Exhaust device; 601. Exhaust duct; 602. Defoaming assembly; 603. First defoaming hole; 604. Sealing plug; 605. Sealing ring; 606. Defoaming tube; 607. Connecting section; 608. Tip; 609. Defoaming net; 610. Second defoaming hole; 7. Battery cell. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[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., 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.

[0034] 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.

[0035] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0036] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0037] The term "plurality" used in this application refers to two or more (including two).

[0038] The production process of battery cells typically includes a formation step. Formation refers to the low-current charging of the battery cells after the electrode assembly is placed in the battery shell and the electrolyte is injected. During the formation process, some gas is generated, which mixes with the electrolyte in the battery cell to form electrolyte foam. Electrolyte foam is highly fluid and prone to overflow. This overflowing electrode liquid foam remains on the surface of the battery cell shell, which can easily cause short circuits in the battery cell and waste electrolyte.

[0039] To address the above-mentioned issues, embodiments of the present application provide an exhaust device equipped with an exhaust duct to exhaust gases generated during the formation process, thereby reducing the risk of gas accumulation within the battery cell causing deformation of the outer shell or premature activation of the pressure relief mechanism, and improving the stability of the battery cell formation process. Furthermore, the exhaust device is equipped with a defoaming mesh to filter foam from the battery cell, reducing the risk of foam overflowing from the outer shell and remaining on the outer shell. Only gases are allowed to be discharged, reducing electrode liquid residue on the surface of the battery cell, improving the stability of the battery cell operation process, and reducing electrolyte waste.

[0040] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0041] Battery cells may include but are not limited to lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0042] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0043] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0044] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module. Figure 2 As shown, multiple battery cells are stacked along the thickness direction to form a battery module.

[0045] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0046] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0047] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0048] Batteries can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices may include, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, and the like. Electric toys may include fixed or mobile electric toys, such as game consoles, electric cars, electric ships, and electric airplanes. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft.

[0049] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0050] Figure 1A schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0051] like Figure 1 As shown, 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 be used as an operating power source for the vehicle 1.

[0052] The vehicle 1 may further include a controller 3 and a motor 4 . The controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of the vehicle 1 during startup, navigation, and driving.

[0053] In some embodiments of the present application, the battery 2 can not only serve as the operating power source of the vehicle 1, but also serve as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0054] Figure 2 Schematic diagram of the exploded structure of the battery provided in some embodiments of the present application. Figure 2 As shown, 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 .

[0055] The housing 5 is used to accommodate the battery cells 7 and can have various structures. In some embodiments, the housing 5 can include a first housing portion 51 and a second housing portion 52. The first housing portion 51 and the second housing portion 52 overlap each other and together define a storage space 53 for accommodating the battery cells. The second housing portion 52 can be a hollow structure with one end open. The first housing portion 51 is a plate-like structure. The first housing portion 51 overlaps the open side of the second housing portion 52 to form the housing 5 with the storage space 53. The first housing portion 51 and the second housing portion 52 can also be hollow structures with one end open. The open side of the first housing portion 51 overlaps the open side of the second housing portion 52 to form the housing 5 with the storage space 53. Of course, the first housing portion 51 and the second housing portion 52 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0056] In order to improve the sealing performance after the first box body 51 and the second box body 52 are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 51 and the second box body 52 .

[0057] Assuming that the first box portion 51 covers the top of the second box portion 52 , the first box portion 51 can also be referred to as an upper box cover, and the second box portion 52 can also be referred to as a lower box.

[0058] In the battery 2, there can be one or more battery cells 7. If there are multiple battery cells 7, the multiple battery cells 7 can be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to the multiple battery cells 7 being connected both in series and in parallel. The multiple battery cells 7 can be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 7 can be housed in the housing 5. Of course, multiple battery cells can also be first connected in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules can be connected in series, in parallel, or in a hybrid connection to form a single unit and housed in the housing 5.

[0059] In some embodiments, battery 2 further includes a heat exchange plate for exchanging heat with battery cells 7. Heat exchange channels are typically provided within the heat exchange plate for the flow of a heat exchange medium. This flow of heat exchange medium removes heat from battery cells 7, controlling the operating temperature of battery cells 7 within a reasonable range and ensuring stable operation of battery cells 7.

[0060] For example, the battery cell 7 may be the smallest unit constituting the battery 2 .

[0061] Figure 3 Schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0062] like Figure 3 As shown, in some embodiments, the battery cell 7 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40 .

[0063] The electrode assembly 10 includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell 7, active ions (e.g., lithium ions) are intercalated and released between the positive and negative electrodes. Optionally, the electrode assembly 10 also includes a separator disposed between the positive and negative electrodes. The separator can reduce the risk of short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0064] The housing 40 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 40 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 40), or an aluminum-plastic film.

[0065] In some embodiments, the housing 40 includes a shell 20 and an end cover 30 . The shell 20 has an opening, and the end cover 30 is used to cover the opening.

[0066] In some embodiments, the battery cell 7 further includes an electrolyte contained in the housing 40. The electrolyte conducts ions between the positive and negative electrodes and can be in liquid, gel, or solid form.

[0067] In some embodiments, the battery cell 7 includes electrode terminals that are electrically connected to the electrode assembly 10 for outputting or inputting electrical energy from the battery cell 7 .

[0068] In some embodiments, the battery cell 7 includes a pressure relief mechanism 24, which is configured to rupture when the internal pressure of the battery cell 7 exceeds a threshold value to release the internal pressure of the battery cell 7. Specifically, the pressure relief mechanism 24 may be an element or component that is activated when the battery cell 7 reaches a certain condition.

[0069] The battery cell 7 further includes a liquid injection hole 31 for injecting electrolyte into the receiving cavity of the battery cell 7. Exemplarily, the liquid injection hole 31 is provided in the end cover 30 and is provided through the end cover 30 in a thickness direction.

[0070] Please refer to 3 to 4. Figure 3 This is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. Figure 4 A schematic structural diagram of an exhaust device provided in some embodiments of the present application.

[0071] As shown in the figure, the exhaust device 6 of the present application includes an exhaust pipe 601 and a defoaming assembly 602. The exhaust pipe 601 is used to connect to the injection hole 31 of the battery cell 7. The exhaust pipe 601 communicates with the storage cavity of the battery cell 7 to release the gas inside the battery cell 7. The defoaming assembly 602 is connected to the end of the exhaust pipe 601 facing the battery cell 7. The defoaming assembly 602 is provided with a plurality of defoaming holes, which are used to reduce the electrolyte foam in the storage cavity from overflowing from the injection hole 31.

[0072] The exhaust device 6 in the embodiment of the present application is used in the formation process after the battery cell 7 is filled with liquid. During the formation process, the exhaust device 6 is arranged in the injection hole 31 of the battery cell 7. After the formation is completed, the exhaust device 6 can be removed and the injection hole 31 can be sealed.

[0073] The exhaust pipe 601 needs to be made of a material with a certain degree of corrosion resistance. For example, it can be made of any one of natural rubber, silicone rubber, nitrile rubber, and chloroprene rubber.

[0074] In some embodiments, the exhaust pipe 601 may be connected to a negative pressure mechanism to absorb the gas exhausted from the injection hole 31 to improve the efficiency of gas exhaust.

[0075] Defoaming holes are provided in the defoaming net, and the mesh structure usually has an uneven surface, and the solid parts on these surfaces can effectively capture and trap bubbles. When bubbles contact the mesh structure, they will be trapped by these solid parts, thereby preventing the bubbles from rising and escaping. At the same time, the mesh structure will generate a certain amount of tension and pressure when subjected to liquid flow or external pressure. These tensions and pressures will act on the bubbles, causing them to be squeezed and deformed. This squeezing and deformation will cause the surface area of ​​the bubbles to decrease, thereby increasing the pressure inside the bubbles, and eventually causing the bubbles to burst. The above structure can effectively reduce the risk of bubbles in the electrode liquid rising and overflowing from the injection hole 31.

[0076] In the technical solution of the embodiment of the present application, an exhaust duct 601 is provided to discharge the gas generated during the formation process, thereby reducing the risk of gas accumulation in the battery cell 7 causing deformation of the outer shell 40 or premature opening of the pressure relief mechanism 24, and improving the stability of the formation process of the battery cell 7. A defoaming mesh is provided to filter the foam in the battery cell 7, reducing the risk of foam overflowing from the outer shell 40 and remaining on the outer shell 40. Only gas is allowed to be discharged, reducing the electrode liquid residue on the surface of the battery cell 7, improving the stability of the battery cell 7 during operation, and reducing the waste of electrolyte.

[0077] like Figure 5 As shown, in some embodiments of the present application, the exhaust device 6 further includes a sealing plug 604 sealedly connected to the exhaust pipe 601 , and a vent is provided on the sealing plug 604 for discharging gas inside the battery cell 7 .

[0078] The defoaming assembly 602 filters the foam, and the sealing plug 604 seals the electrolyte, reducing the risk of electrolyte overflowing from the housing 40 and remaining on the housing 40, thereby reducing electrolyte waste. For example, the sealing plug 604 can be made of rubber, which has high corrosion resistance and elasticity, improving sealing performance. The provision of the sealing plug 604 creates a relatively sealed structure, further reducing the risk of electrolyte leakage.

[0079] In some embodiments of the present application, the cross-sectional area of ​​the sealing plug 604 gradually increases along the direction from the accommodating cavity to the exhaust duct 601. In the above structure, the cross-sectional area of ​​the sealing plug 604 gradually increases along the direction from the accommodating cavity to the exhaust duct 601. This design can form a gradually enhanced sealing effect, effectively preventing the electrolyte from overflowing from the exhaust duct 601 under conditions such as high pressure or vibration. By providing a combination of the exhaust duct 601 and the defoaming component 602, the risk of gas accumulation in the battery cell 7 causing deformation of the housing 40 or premature opening of the pressure relief mechanism 24 is effectively reduced, thereby improving the stability of the battery cell 7 formation process.

[0080] like Figure 6As shown, in some embodiments of the present application, a sealing ring 605 is further provided on the outer periphery of the exhaust duct 601. The sealing ring 605 is used to seal between the exhaust duct 601 and the housing 40 of the battery cell 7. Exemplarily, the sealing ring 605 is disposed circumferentially around the exhaust duct 601. The sealing ring 605 has a radial thickness of 1 mm to 30 mm and an axial height of 5 mm to 30 mm.

[0081] The provision of sealing ring 605 improves the seal between exhaust duct 601 and outer shell 40 of battery cell 7, effectively preventing electrolyte leakage. Sealing ring 605 reduces the risk of electrolyte leaking from the connection between exhaust duct 601 and outer shell 40 and remaining on the surface of battery cell 7, thereby improving the safety and stability of battery cell 7.

[0082] like Figure 7 As shown, in some embodiments of the present application, the defoaming component 602 includes a defoaming tube 606, which is connected to one end of the exhaust pipe 601 facing the accommodating cavity, and is provided with a plurality of first defoaming holes 603.

[0083] In the above structure, the first defoaming holes 603 in the defoaming tube 606 can effectively separate the gas from the liquid in the foam, preventing liquid overflow and improving the safety of the battery cell 7. The first defoaming holes 603 allow the gas to be discharged smoothly, reducing the accumulation of gas inside the battery cell 7 and improving the stability of the formation process.

[0084] In some embodiments of the present application, the defoaming tube 606 includes a connecting section 607 and a tip portion 608. The connecting section 607 is connected to the end of the exhaust pipe 601 and extends axially along the exhaust pipe 601. The tip portion 608 is connected to the end of the connecting section 607 away from the exhaust pipe 601. The cross-sectional area of ​​the tip portion 608 gradually decreases along the exhaust pipe 601 toward the connecting section 607. Both the connecting section 607 and the tip portion 608 are provided with a first defoaming hole 603.

[0085] In the above structure, the connecting section 607 is connected to the end of the exhaust pipe 601 and extends along the axial direction of the exhaust pipe 601. Its design increases the surface area of ​​the defoaming tube 606, thereby improving the filtration efficiency of the foam in the electrolyte. A plurality of first defoaming holes 603 are provided on the connecting section 607, which allow gas to pass through while preventing liquid from overflowing. The tip portion 608 is connected to the end of the connecting section 607 away from the exhaust pipe 601. Its cross-sectional area gradually decreases along the direction of the exhaust pipe 601 toward the connecting section 607, forming a conical structure. This design makes it easier for the defoaming tube 606 to enter the interior of the battery cell 7, ensuring sufficient contact with the electrolyte inside the battery cell 7, and further improving the foam filtration effect.

[0086] Optionally, the first defoaming hole 603 is a circular through hole, an elliptical through hole, a polygonal through hole or an irregularly shaped through hole. The shape of the first defoaming hole 603 can be selected according to design requirements and is not limited here.

[0087] In some optional embodiments, the tip portion 608 seals the end of the connecting section 607 facing away from the exhaust pipe 601. The sealing means that the tip portion 608 and the connecting section 607 are sealed, reducing the risk of liquid overflow caused by the large port diameter of the connecting section 607.

[0088] In some optional embodiments, the tip portion 608 and the connecting section 607 are integrally formed. Integral molding means that the product can be manufactured in a single process, eliminating the need for secondary or subsequent processing. This can reduce the number of parts, simplify the production process, and improve production efficiency and quality.

[0089] In some embodiments of the present application, the defoaming assembly 602 further includes a defoaming net 609, which is disposed between the defoaming tube 606 and the exhaust duct 601. The defoaming net 609 is provided with a plurality of second defoaming holes 610. The defoaming net 609 may be a mesh structure that covers the end of the connecting section 607 facing one end of the connecting section 607. The second defoaming holes 610 extend axially through the defoaming net 609 along the connecting section 607. After entering the defoaming tube 606, the gas must pass through the second defoaming holes 610 of the defoaming net 609 before entering the connecting section 607.

[0090] By providing a defoaming net 609, the foam in the electrolyte is further refined after the initial filtration by the defoaming tube 606. The defoaming net 609 can more effectively capture and separate these fine bubbles, ensuring that only gas can be discharged smoothly. The dual defoaming mechanism can efficiently filter the foam in the electrolyte and reduce the risk of liquid overflow. At the same time, the second defoaming hole 610 allows the gas to be discharged smoothly, reducing the accumulation of gas inside the battery cell 7 and improving the stability of the formation process.

[0091] Optionally, the second defoaming hole 610 is a circular through hole, an elliptical through hole, a polygonal through hole or an irregularly shaped through hole. The shape of the second defoaming hole 610 can be selected according to design requirements and is not limited here.

[0092] In some embodiments of the present application, the defoaming tube 606 is any one of an iron tube, a copper tube, an aluminum alloy tube, or a steel tube, and the defoaming net 609 is any one of an iron net, a copper net, an aluminum alloy net, or a steel net.

[0093] The defoaming screen constructed from materials such as iron, copper, aluminum alloy, or steel pipes possesses high structural strength, can withstand significant pressure, and ensures long-term stable operation. The selected materials exhibit excellent corrosion resistance, allowing for long-term use in harsh operating environments without damage. This device boasts a simple structure, easy installation, and reliable operation, making it suitable for a wide range of battery cell types.

[0094] In some embodiments of the present application, the diameter D of the first defoaming holes 603 is: 0.1 mm ≤ D ≤ 5 mm. For example, D is 0.5 mm, 0.8 mm, 1.0 mm, or 3.0 mm. By providing the first defoaming holes 603 with a diameter between 0.1 mm and 5 mm, the holes resemble the shape of foam, thereby improving the efficiency of foam filtration.

[0095] Optionally, the diameter of the first defoaming hole 603 in the defoaming tube 606 is equal to the diameter of the second defoaming hole 610 in the defoaming net 609. During the formation process of the battery cell 7, the gas generated inside is first preliminarily filtered through the defoaming tube 606 to remove larger bubbles. When these bubbles pass through the first defoaming hole 603 on the defoaming tube 606, the bubbles can be effectively captured and separated because the diameter of the hole is similar to the shape of the foam. Then, the gas that has been preliminarily filtered enters the defoaming net 609 for more detailed filtration. The second defoaming hole 610 on the defoaming net 609 also has a diameter similar to that of the foam, which can further capture and separate fine bubbles. Finally, only pure gas is discharged from the above-mentioned structure of the battery cell 7 through the exhaust pipe 601, which is similar to the shape of the foam, thereby improving the efficiency of filtering the foam.

[0096] Optionally, the diameter of the first defoaming hole 603 in the defoaming tube 606 is larger than the diameter of the second defoaming hole 610 in the defoaming net 609. During the formation process of the battery cell 7, the gas generated inside is first preliminarily filtered through the defoaming tube 606. Since the diameter of the defoaming hole on the defoaming tube 606 is larger, it can effectively capture and separate larger bubbles. Then, the gas that has undergone preliminary filtration enters the defoaming net 609 for more detailed filtration. Since the diameter of the second defoaming hole 610 on the defoaming net 609 is smaller, it can further capture and separate fine bubbles, ensuring that only pure gas is discharged from the battery cell 7 through the exhaust pipe 601. The risk of electrolyte leakage is reduced and the stability of the formation process of the battery cell 7 is improved.

[0097] like Figure 7As shown, in some optional embodiments, the exhaust device 6 includes an exhaust pipe 601 and a defoaming component 602. The exhaust pipe 601 is used to be connected to the injection hole 31 of the battery cell 7. The exhaust pipe 601 is connected to the accommodating cavity of the battery cell 7 to release the gas inside the battery cell 7. The defoaming component 602 is connected to one end of the exhaust pipe 601 facing the battery cell 7. The defoaming component 602 is provided with a plurality of defoaming holes, and the defoaming holes are used to reduce the electrolyte foam in the accommodating cavity from overflowing from the injection hole 31. The exhaust device 6 also includes a sealing plug 604 that is sealed with the exhaust pipe 601. The sealing plug 604 is provided with a vent hole, and the vent hole is used to discharge the gas inside the battery cell 7. A sealing ring 605 is also provided on the outer periphery of the exhaust pipe 601. The sealing ring 605 is used to seal between the exhaust pipe 601 and the outer shell 40 of the battery cell 7. The defoaming assembly 602 includes a defoaming pipe 606, which is connected to the end of the exhaust duct 601 facing the accommodating chamber and is provided with a plurality of first defoaming holes 603. The defoaming pipe 606 includes a connecting section 607 and a tip portion 608. The connecting section 607 is connected to the end of the exhaust duct 601 and extends axially along the exhaust duct 601. The tip portion 608 is connected to the end of the connecting section 607 away from the exhaust duct 601. The cross-sectional area of ​​the tip portion 608 gradually decreases as the exhaust duct 601 moves toward the connecting section 607. Both the connecting section 607 and the tip portion 608 are provided with first defoaming holes 603. The defoaming assembly 602 also includes a defoaming net 609, which is disposed between the defoaming pipe 606 and the exhaust duct 601 and is provided with a plurality of second defoaming holes 610.

[0098] The embodiments of the present application also provide a battery cell formation device, which includes the exhaust device 6 in the above embodiment. In the formation device in the present application, an exhaust duct 601 is provided to discharge the gas generated during the formation process, thereby reducing the risk of gas accumulation in the battery cell 7 causing deformation of the outer shell 40 or premature opening of the pressure relief mechanism 24, and improving the stability of the formation process of the battery cell 7. A defoaming mesh is provided to filter the foam in the battery cell 7, reducing the risk of foam overflowing from the outer shell 40 and remaining on the outer shell 40, allowing only gas to be discharged, reducing the electrode liquid residue on the surface of the battery cell 7, improving the stability of the battery cell 7 during operation, and reducing the waste of electrolyte.

[0099] 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. An exhaust device, characterized in that: include: an exhaust duct, configured to be connected to the liquid injection hole of the battery cell, the exhaust duct being in communication with the accommodating cavity of the battery cell to release the gas inside the battery cell; The defoaming component is connected to one end of the exhaust pipe toward the battery cell. The defoaming component is provided with a plurality of defoaming holes, which are used to reduce the electrolyte foam inside the accommodating cavity from overflowing from the injection hole.

2. The exhaust device according to claim 1, characterized in that The exhaust device further comprises a sealing plug which is sealed to the exhaust pipe, and a vent hole is provided on the sealing plug, and the vent hole is used to discharge the gas inside the battery cell.

3. The exhaust device according to claim 2, characterized in that The cross-sectional area of ​​the sealing plug gradually increases along the direction from the accommodating cavity toward the exhaust pipe.

4. The exhaust device according to claim 1, characterized in that A sealing ring is further provided on the outer periphery of the exhaust duct, and the sealing ring is used for sealing between the exhaust duct and the outer shell of the battery cell.

5. The exhaust device according to any one of claims 1 to 4, characterized in that: The defoaming component includes a defoaming pipe, which is connected to one end of the exhaust pipe facing the accommodating cavity, and is provided with a plurality of first defoaming holes.

6. The exhaust device according to claim 5, characterized in that: The defoaming tube comprises: a connecting section connected to an end of the exhaust pipe and extending along the axial direction of the exhaust pipe; The tip portion is connected to an end of the connecting section away from the exhaust pipe, and the cross-sectional area of ​​the tip portion gradually decreases along the direction of the exhaust pipe toward the connecting section. Wherein, the connecting section and the tip portion are both provided with the first defoaming hole.

7. The exhaust device according to claim 6, characterized in that The defoaming component further includes a defoaming net, which is arranged between the defoaming pipe and the exhaust pipe, and a plurality of second defoaming holes are provided on the defoaming net.

8. The exhaust device according to claim 7, characterized in that The defoaming pipe is any one of an iron pipe, a copper pipe, an aluminum alloy pipe or a steel pipe, and the defoaming net is any one of an iron net, a copper net, an aluminum alloy net or a steel net.

9. The exhaust device according to claim 5, characterized in that The diameter D of the first defoaming hole is: 0.1 mm≤D≤5 mm.

10. A battery monomer formation device, characterized in that: Comprising the exhaust device according to any one of claims 1-9.

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