Sodium-ion battery cell, battery device, and electric device

Abstract

A sodium-ion battery monomer, a manufacturing method thereof, a battery device and an electric equipment, the sodium-ion battery monomer comprises a shell assembly, an electrode assembly and a pole assembly, the shell assembly has a containing cavity and comprises a first side plate; the electrode assembly is accommodated in the containing cavity, the electrode assembly comprises a pole piece body and a connecting piece connected with the pole piece body; the pole assembly is arranged on the first side plate, the pole assembly comprises a plurality of spaced pole bodies, the pole bodies are connected with the pole piece body through the connecting piece, the materials of the plurality of pole bodies are the same, the material of the connecting piece is the same as that of the pole, the pole body comprises a welding surface away from the pole piece body, and the pole body is welded with the connecting piece and a weld is formed on the welding surface. In this way, the pole body and the connecting piece can be welded from the outside of the sodium-ion battery monomer, thereby improving the welding efficiency of the pole body and the connecting piece and being conducive to reducing the generation cost of the sodium-ion battery monomer.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a sodium-ion battery cell and its manufacturing method, battery device, and electrical equipment. Background Technology

[0002] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0003] In related technologies, a sodium-ion battery cell includes an electrode assembly and a terminal post. The tabs of the electrode assembly are welded to the terminal post. Therefore, how to further improve the welding efficiency of the tabs and terminal post welding has become a technical problem to be solved. Utility Model Content

[0004] This application provides a sodium-ion battery cell and its manufacturing method, battery device and electrical equipment, which can improve the welding efficiency of the tab and the terminal post.

[0005] The sodium-ion battery cell of this application includes a housing assembly, an electrode assembly, and a terminal assembly. The housing assembly has a receiving chamber and includes a first side plate. The electrode assembly is housed in the receiving chamber and includes an electrode body and a connecting piece connected to the electrode body. The terminal assembly is disposed on the first side plate and includes a plurality of spaced-apart terminal bodies. The terminal bodies are connected to the electrode bodies via the connecting pieces. The plurality of terminal bodies are made of the same material. The connecting pieces are made of the same material as the terminal bodies. Each terminal body includes a welding surface facing away from the electrode body. The terminal body is welded to the connecting pieces, and a weld is formed on the welding surface.

[0006] In the sodium-ion battery cell of this application embodiment, the electrode body includes a welding surface that is away from the electrode body. The electrode body is welded to the connecting piece and a weld is formed on the welding surface. That is to say, the electrode body and the connecting piece can be welded from the outside of the sodium-ion battery cell, thereby improving the welding efficiency of the electrode body and the connecting piece and helping to reduce the production cost of the sodium-ion battery cell.

[0007] In some embodiments, the electrode body is made of a single material. In the above embodiments, using a single material for the electrode body makes it easier to manufacture.

[0008] In some embodiments, the electrode body and the connecting piece are made of one of aluminum, copper, nickel, and titanium. In the above embodiments, using one of these materials for the electrode body and the connecting piece not only meets the conductivity requirements of the electrode body and the connecting piece but also makes them more corrosion-resistant.

[0009] In some embodiments, the electrode body includes a bottom wall and a side wall connected to the bottom wall, the bottom wall and the side wall forming a groove, and the bottom wall having the welding surface. In the above embodiments, the groove allows for a thinner portion of the electrode body, which is beneficial for welding the bottom wall to the connecting piece.

[0010] In some embodiments, the bottom surface of the groove is the welding surface, the connecting piece abuts against the surface of the bottom wall facing the electrode body, and the weld penetrates the bottom wall. In the above embodiments, the connecting piece abuts against the surface of the bottom wall facing the electrode body, which simplifies the structure of the electrode body and reduces the manufacturing cost of sodium-ion battery cells.

[0011] In some embodiments, the bottom surface of the groove is the welding surface, and the bottom wall has a through hole extending through the bottom wall along its thickness direction. The connecting piece passes through the through hole and is connected to the welding surface. In the above embodiments, the connecting piece passing through the through hole and connecting to the welding surface makes the welding of the connecting piece to the bottom wall more secure and makes it easier to inspect the quality of the weld.

[0012] In some embodiments, the electrode assembly includes an electrode cover plate disposed in the opening of the groove. In the above embodiments, the electrode cover plate has a large surface area, which facilitates stable welding with external parts and is beneficial for the electrode body to be electrically connected to external parts through the electrode cover plate.

[0013] In some embodiments, a limiting platform is provided on the side of the groove, and the pole cap is disposed on the limiting platform. In this way, the limiting platform can restrict the position of the pole cap, which is beneficial for welding the pole cap to the pole body.

[0014] In some embodiments, the electrode assembly includes a first insulating member disposed on the first side plate, the first insulating member isolating the first side plate and the electrode body. In the above embodiments, the first insulating member isolating the first side plate and the electrode body can reduce the risk of short circuit between the first side plate and the electrode body.

[0015] In some embodiments, the electrode assembly includes a transition structure and a first insulating member. The transition structure is disposed on the first side plate, the electrode body is disposed on the transition structure, and the first insulating member is disposed on the transition structure and isolates the transition structure and the electrode body. In the above embodiments, the transition structure helps to hold the electrode body in a stable position, and the first insulating member isolates the transition structure and the electrode body, which can reduce the risk of short circuit between the first side plate and the electrode body.

[0016] In some embodiments, the adapter structure includes a first adapter and a second adapter connected to the first adapter. The first adapter is disposed on the first side plate, and the second adapter presses against the pole body through the first insulating member. The first insulating member covers at least a portion of the second adapter and isolates the second adapter from the pole body. In the above embodiments, the adapter structure includes a first adapter and a second adapter that are assembled together, thereby facilitating the assembly connection of the adapter structure with the first insulating member and the pole body, making the pole assembly easier to manufacture.

[0017] In some embodiments, the electrode assembly includes a seal disposed between the first adapter and the electrode body, the seal sealing the gap between the first adapter and the electrode body. In the above embodiments, the seal sealing the gap between the first adapter and the electrode body improves the sealing effect between the electrode body and the first adapter, mitigates leakage at the mating point of the first adapter and the electrode body, and achieves insulation between the first adapter and the electrode body.

[0018] In some embodiments, the pole assembly includes a second insulating element disposed on the adapter structure, the second insulating element being located in the receiving chamber and isolating the connecting piece and the pole body from the adapter structure, respectively.

[0019] In the above embodiments, the second insulating element can reduce the risk of short circuits formed between the connecting piece, the pole body and the adapter structure, respectively.

[0020] In some embodiments, the sodium-ion battery cell includes an insulating support that connects to the first side plate and is located between the first side plate and the electrode body.

[0021] In the above embodiments, since the insulating support is located between the first side plate and the electrode body, the insulating support can insulate and separate the electrode body from the first side plate, reducing the risk of short circuit between the first side plate and the electrode body and improving the reliability of the sodium-ion battery cell.

[0022] In some embodiments, the insulating support is provided with a through hole, and the connecting piece passes through the through hole.

[0023] In the above embodiments, since the connecting piece is inserted into the through hole, the insulating bracket can provide a certain support for the connecting piece. The insulating bracket can insulate the free end of the connecting piece from the electrode body, reduce the risk of the free end of the connecting piece being inserted into the electrode body, reduce the risk of short circuit, and improve the reliability of the sodium-ion battery cell.

[0024] In some embodiments, the outer periphery of the pole body is provided with a riveting portion, and the pole assembly includes a riveting block, which is connected to the riveting portion.

[0025] In the above embodiments, the rivet block can restrict the position of the electrode body, making the position of the electrode body stable and improving the reliability of the sodium-ion battery cell.

[0026] In some embodiments, the connecting piece includes a tab, a current collector, or an adapter piece. In the above embodiments, the connecting piece can adopt a specific structure to connect the electrode body and the electrode post body, facilitating welding of the connecting piece to the electrode post body.

[0027] This application also provides a manufacturing method for manufacturing a sodium-ion battery cell according to any of the above embodiments, the manufacturing method comprising:

[0028] The pole assembly is mounted on the first side plate;

[0029] The electrode assembly is inserted into the receiving chamber;

[0030] Connect the connecting piece to the welding surface of the pole body;

[0031] The pole body is welded to the connecting piece, and a weld is formed on the welding surface.

[0032] In the manufacturing method described above, the electrode body and connecting piece can be welded from the outside of the sodium-ion battery cell, thereby improving the welding efficiency of the electrode body and connecting piece and helping to reduce the production cost of the sodium-ion battery cell.

[0033] In some embodiments, the pole body includes a bottom wall and a side wall connected to the bottom wall, the bottom wall and the side wall forming a groove, the bottom surface of the groove being the welding surface, and the bottom wall having a through hole extending through the bottom wall along the thickness direction;

[0034] The process of connecting the connecting piece to the welding surface of the pole body includes:

[0035] The connecting piece is passed through the through hole and bent to overlap the welding surface.

[0036] In the above embodiment, the connecting piece passes through the through hole and is connected to the welding surface, making the connecting piece welded to the bottom wall more firmly and making it easier to inspect the quality of the weld.

[0037] In some embodiments, the electrode body includes a bottom wall and a side wall connected to the bottom wall, the bottom wall and the side wall forming a groove, the bottom surface of the groove being the welding surface, the sodium-ion battery cell including an insulating support, the insulating support connecting to the first side plate and located between the first side plate and the electrode body, the insulating support having a through hole;

[0038] The process of connecting the connecting piece to the welding surface of the pole body includes:

[0039] The connecting piece is passed through the through hole and bent to overlap the bottom wall surface facing the electrode body.

[0040] In the above embodiments, the connecting piece overlaps on the bottom wall surface facing the electrode body, which simplifies the structure of the electrode body and reduces the manufacturing cost of sodium-ion battery cells.

[0041] This application also provides a battery device comprising a plurality of sodium-ion battery cells as described in any of the above embodiments.

[0042] This application also provides an electrical device, which includes the battery device or sodium-ion battery cell described in any of the above embodiments.

[0043] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0044] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0045] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;

[0046] Figure 2 This is an exploded perspective view of a battery device according to some embodiments of this application;

[0047] Figure 3This is a three-dimensional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0048] Figure 4 This is a top view schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0049] Figure 5 for Figure 4 A schematic cross-sectional view of a sodium-ion battery cell along the AA direction.

[0050] Figure 6 This is a cross-sectional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0051] Figure 7 This is another cross-sectional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0052] Figure 8 This is another cross-sectional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0053] Figure 9 This is another cross-sectional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0054] Figure 10 This is another cross-sectional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0055] Figure 11 This is another cross-sectional schematic diagram of a sodium-ion battery cell according to some embodiments of this application;

[0056] Figure 12 This is a schematic diagram illustrating the manufacturing process of a sodium-ion battery cell according to some embodiments of this application;

[0057] Figure 13 This is a schematic diagram of the manufacturing process of a sodium-ion battery cell according to some embodiments of this application.

[0058] Explanation of reference numerals in the attached figures:

[0059] 400-Battery assembly; 410-Casing; 411-First casing; 412-Second casing; 100-Sodium-ion battery cell; 10-Housing assembly; 11-Receiving chamber; 12-First side plate; 20-Electrode assembly; 21-Electrode body; 22-Connecting piece; 30-Terminal assembly; 31-Terminal body; 311-Welding surface; 312-Weld; 313-Bottom wall; 3131-Through hole; 314-Side wall; 315-Groove; 316-Limiting platform; 317-Riveting part; 32-Terminal cover plate; 33-First insulating component; 34-Transfer structure; 341-First adapter; 342-Second adapter; 35-Sealing component; 36-Second insulating component; 37-Riveting block; 40-Insulating bracket; 41-Through hole; 1000-Vehicle; 200-Controller; 300-Motor. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0061] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0062] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0063] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0066] In this application, "multiple" means two or more (including two).

[0067] In the embodiments of this application, unless otherwise specified, all implementation methods and optional implementation methods of this application can be combined with each other to form new technical solutions.

[0068] In the embodiments of this application, unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form new technical solutions.

[0069] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0070] In related technologies, a sodium-ion battery cell includes an electrode assembly and a terminal post. The tabs of the electrode assembly are welded to the terminal post. Before welding the tabs to the terminal post, the electrode assembly is first installed into the housing. Then, the tabs extend out of the housing, forming a single unit with the terminal post and insulating plastic. This unit is laid flat, allowing the tabs to be welded to the terminal post. After welding, the unit is flipped over, causing the tabs to fold and seal the opening in the housing. Therefore, the entire process of welding the tabs to the terminal post is relatively complex, which is not conducive to improving the processing efficiency of sodium-ion battery cells.

[0071] Therefore, this application provides a sodium-ion battery cell, which includes a housing assembly, an electrode assembly, and a terminal assembly. The housing assembly has a receiving chamber and includes a first side plate. The electrode assembly is housed in the receiving chamber and includes an electrode body and a connecting piece connected to the electrode body. The terminal assembly is disposed on the first side plate and includes a plurality of spaced-apart terminal bodies. The terminal bodies are connected to the electrode bodies via the connecting piece. The plurality of terminal bodies are made of the same material, and the connecting piece is made of the same material as the terminal body. Each terminal body includes a welding surface facing away from the electrode body, and the terminal body is welded to the connecting piece, forming a weld seam on the welding surface.

[0072] In the sodium-ion battery cell of this application embodiment, the electrode body includes a welding surface that is away from the electrode body. The electrode body is welded to the connecting piece and a weld is formed on the welding surface. That is to say, the electrode body and the connecting piece can be welded from the outside of the sodium-ion battery cell, thereby improving the welding efficiency of the electrode body and the connecting piece and helping to reduce the production cost of the sodium-ion battery cell.

[0073] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0074] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0075] Please refer to Figure 1Vehicle 1000 can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Furthermore, vehicle 1000 can be a commercial vehicle. A battery device 400 is installed inside vehicle 1000, which can be located at the bottom, front, or rear of vehicle 1000. Battery device 400 can be used to power vehicle 1000; for example, battery device 400 can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a controller 200 and a motor 300. Controller 200 is used to control the battery device 400 to supply power to motor 300, for example, to meet the power needs of vehicle 1000 during starting, navigation, and driving.

[0076] In some embodiments of this application, the battery device 400 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0077] Please see Figure 2 In embodiments of this application, the battery apparatus 400 may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple sodium-ion battery cells 100, which are connected in series, parallel, or mixed connections via busbars. For example, a battery cell assembly is typically formed by arranging multiple sodium-ion battery cells 100; a battery cell assembly may also be a battery module, which is formed by arranging and fixing multiple sodium-ion battery cells 100 into a single module. As an example, a battery module may be formed by bundling multiple sodium-ion battery cells 100 together with cable ties.

[0078] The battery device 400 can be a battery pack, which includes a housing 410 and one or more cell assemblies housed within the housing 410. The cell assembly can be a battery module, which can be housed within the housing 410 by fixing the battery module to the housing 410; alternatively, the cell assembly can be housed within the housing 410 by directly fixing multiple sodium-ion battery cells 100 to the housing 410.

[0079] In embodiments of this application, the housing 410 may include a first housing 411 and a second housing 412. The first housing 411 and the second housing 412 are fastened together, forming a closed space inside the housing 410 to house the battery cell assembly. Here, "closed" refers to covering or shutting off; it can be sealed or unsealed. The first housing 411 may be a top cover or a bottom plate. For example, the housing 410 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, forming a closed space inside the housing 410 to house the battery cell assembly.

[0080] In embodiments of this application, the housing 410 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 410 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 410 may be at least a portion of the vehicle's crossbeams and longitudinal beams.

[0081] In this embodiment, the sodium-ion battery cell 100 can be a secondary battery. A secondary battery refers to a sodium-ion battery cell 100 that can be recharged after discharge to activate the active materials and continue to be used. The sodium-ion battery cell 100 can be flat, cuboid, or other shapes, and this embodiment is not limited in this respect.

[0082] Please see Figures 3-5 The sodium-ion battery cell 100 of this application includes a housing assembly 10, an electrode assembly 20, and a terminal assembly 30. The housing assembly 10 has a receiving chamber 11 and includes a first side plate 12. The electrode assembly 20 is housed in the receiving chamber 11 and includes an electrode body 21 and a connecting piece 22 connected to the electrode body 21. The terminal assembly 30 is disposed on the first side plate 12 and includes a plurality of terminal bodies 31 spaced apart. The terminal bodies 31 are connected to the electrode bodies 21 by the connecting pieces 22. The plurality of terminal bodies 31 are made of the same material, and the connecting pieces 22 are made of the same material as the terminal bodies. The terminal bodies 31 include a welding surface 311 facing away from the electrode body 21. The terminal bodies 31 are welded to the connecting pieces 22 and a weld seam 312 is formed on the welding surface 311.

[0083] Specifically, the housing assembly 10 is a hollow structure, with an internal cavity 11 for accommodating the electrode assembly 20 and the electrolyte. The housing assembly 10 can have various shapes, such as a cylinder or a cuboid. The shape of the housing assembly 10 can be determined based on the specific shape of the electrode assembly 20. For example, if the electrode assembly 20 is cylindrical, a cylindrical housing can be used; if the electrode assembly 20 is cuboid, a cuboid housing can be used. The housing assembly 10 can be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, or plastic.

[0084] The first side plate 12 can be an end wall in the height direction of the sodium-ion battery cell 100. The first side plate 12 can be an integral structure with the main body of the housing assembly 10, or it can be a separate structure. Figure 5 In this embodiment, the first side plate 12 and the main body of the housing assembly 10 are an integral structure. For example... Figure 6 In one embodiment, the first side plate 12 and the main body of the housing assembly 10 are separate structures.

[0085] The electrode assembly 20 is the core component for enabling the sodium-ion battery cell 100 to perform charge and discharge functions. The electrode body 21 includes a positive electrode, a negative electrode, and a separator. The positive and negative electrodes have opposite polarities, and the separator is used to insulate and isolate the positive and negative electrodes. The electrode assembly 20 mainly relies on the movement of metal ions between the positive and negative electrodes to operate.

[0086] In some embodiments, the positive electrode includes a positive current collector and a positive electrode film layer disposed on at least one surface of the positive current collector, the positive electrode film layer including a positive electrode active material. The positive current collector may be a metal foil or a composite current collector. For example, aluminum foil may be used as the metal foil. The composite current collector may include a polymer material substrate and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0087] Optionally, the positive electrode active material may also include positive electrode active materials known in the art for sodium-ion batteries. For example, the positive electrode active material may also include one or more of polyanionic compounds and Prussian blue compounds. As an example, polyanionic compounds may be compounds having sodium ions, transition metal ions, and tetrahedral anionic units, such as sodium iron phosphate (NaFePO4) and sodium vanadium phosphate (Na3V2(PO4)3). Prussian blue compounds may be compounds having sodium ions, transition metal ions, and cyanide ions. However, this application is not limited to these materials, and other materials that can be used as positive electrode active materials for sodium-ion batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more materials.

[0088] In some embodiments, the negative electrode typically includes a negative current collector, or includes a negative current collector and a negative electrode film layer disposed on at least one surface of the negative current collector, the negative electrode film layer comprising a negative electrode active material. Sodium-ion batteries are sodium metal batteries, meaning the negative electrode of a sodium-ion battery is the negative current collector. In other words, the negative current collector directly serves as the negative electrode of the battery; this type of sodium-ion battery can also be called a "negative electrode-free battery." During charging, sodium ions extracted from the positive electrode deposit onto the negative current collector to form a sodium metal negative electrode, in which sodium metal is the negative electrode active material. In other embodiments, for the normal use of the negative electrode or to facilitate the deposition of sodium metal on the negative current collector, a conductive film layer can be disposed on the negative current collector.

[0089] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode film layer can be disposed on either or both of the two opposite surfaces of the negative electrode current collector. Optionally, the negative electrode current collector can be a metal foil or a composite current collector. For example, copper foil can be used as the metal foil. The composite current collector may include a polymer material substrate and a metal layer formed on at least one surface of the polymer material substrate. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polystyrene (PS), polyethylene (PE), etc.).

[0090] The negative electrode active material can be any negative electrode active material known in the art for use in sodium-ion batteries. For example, the negative electrode active material may include at least one of the following materials: natural graphite, artificial graphite, mesophase microcarbon spheres (MCMB), hard carbon, and soft carbon. As another example, in sodium metal batteries, the negative electrode active material may include at least one of the following materials: sodium metal, carbon-based materials or metals deposited with sodium metal, alloy materials, composite materials containing sodium metal, alloy materials containing sodium metal, etc. However, this application is not limited to these materials, and other materials that can be used as negative electrode active materials for sodium-ion batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more materials.

[0091] The electrode body 31 serves as a conductive terminal, allowing the electrical energy of the sodium-ion battery cell 100 to be discharged. The number of electrode bodies 31 can be two, four, or other quantities. Multiple electrode bodies 31 can be arranged along different paths according to different requirements. The outer contour shape of the electrode body 31 includes, but is not limited to, circular, racetrack-shaped, elliptical, and rectangular shapes.

[0092] The connecting piece 22 is a sheet-like part with conductive function. The connecting piece 22 is made of the same material as the pole, which allows the connecting piece 22 and the pole body 31 to form a molten pool through laser or other means, thereby welding the connecting piece 22 and the pole body 31 together.

[0093] The welding surface 311 of the electrode body 31 forms a weld 312 after the connecting piece 22 is welded to the electrode. The welding surface 311 faces away from the electrode body 21, or in other words, the welding surface 311 faces away from the receiving chamber 11. Therefore, when welding the electrode body 31 and the connecting piece 22, the electrode assembly 30 can be installed onto the housing assembly 10 first, and then the electrode body 31 and the connecting piece 22 can be welded from outside the receiving chamber 11, which makes the welding more convenient.

[0094] It should be noted that the welding surface 311 may or may not be in contact with the connecting piece 22.

[0095] In summary, in the sodium-ion battery cell 100 of this application embodiment, the electrode body 31 includes a welding surface 311 facing away from the electrode body 21. The electrode body 31 is welded to the connecting piece 22 and a weld seam 312 is formed on the welding surface 311. That is to say, the electrode body 31 and the connecting piece 22 can be welded from the outside of the sodium-ion battery cell 100, thereby improving the welding efficiency of the electrode body 31 and the connecting piece 22 and helping to reduce the production cost of the sodium-ion battery cell 100.

[0096] In some embodiments, the pole body 31 is made of a single material. In other words, the pole body 31 is a single-material component. For example, the pole body 31 can be manufactured from a single-material raw material using a machine tool. In the above embodiments, using a single material for the pole body 31 makes it easier to manufacture.

[0097] In some embodiments, the electrode body 31 and the connecting piece 22 are made of one of the following materials: aluminum, copper, nickel, and titanium. For example, both the electrode body 31 and the connecting piece 22 may be made of aluminum; or both may be made of copper. In the above embodiments, using one of these materials for the electrode body 31 and the connecting piece 22 not only meets the conductivity requirements of the electrode body 31 and the connecting piece 22, but also makes the electrode body 31 and the connecting piece 22 more corrosion resistant.

[0098] Please see Figures 5-8 In some embodiments, the pole body 31 includes a bottom wall 313 and a side wall 314 connected to the bottom wall 313. The bottom wall 313 and the side wall 314 enclose a groove 315, and the bottom wall 313 has a welding surface 311.

[0099] Specifically, the sidewall 314 can be annular, for example, it can be racetrack-shaped, making the outline of the groove 315 also racetrack-shaped. The bottom wall 313 and the sidewall 314 can be integrally formed. The bottom wall 313 has a welding surface 311, that is, the connecting piece 22 is welded to the bottom wall 313. Therefore, in the above embodiment, the groove 315 can make part of the pole body 31 thinner, and when using laser welding, the laser can more easily melt part of the bottom wall 313 to form a molten pool, which is beneficial for welding the bottom wall 313 to the connecting piece 22.

[0100] Please see Figure 5 In some embodiments, the bottom surface of the groove 315 is the welding surface 311, the connecting piece 22 abuts against the surface of the bottom wall 313 facing the electrode body 21, and the weld 312 penetrates the bottom wall 313.

[0101] Specifically, during the manufacturing process of the sodium-ion battery cell 100, after the electrode assembly 20 is installed into the housing assembly 10 and the terminal assembly 30 is installed on the housing assembly 10, the connecting piece 22 can be slightly tilted toward the terminal body 31 so that the connecting piece 22 and the terminal body 31 are in contact. Then, laser welding can be used to emit a laser to the bottom surface of the groove 315. The laser melts part of the bottom wall 313 and the electrode body 21, thereby welding the bottom wall 313 to the electrode body 21.

[0102] Thus, the connecting piece 22 abuts against the surface of the bottom wall 313 facing the electrode body 31, which simplifies the structure of the electrode body 31 and reduces the manufacturing cost of the sodium-ion battery cell 100.

[0103] Please see Figure 5 In some embodiments, the bottom surface of the groove 315 is a welding surface 311, and the bottom wall 313 is provided with a through hole 3131 that extends through the bottom wall 313 along the thickness direction of the bottom wall 313. The connecting piece 22 passes through the through hole 3131 and is connected to the welding surface 311.

[0104] Specifically, the through hole 3131 is a through hole. The through hole 3131 communicates with the receiving chamber 11, and the connecting piece 22 extends from the receiving chamber 11 into the groove 315, and after being bent, abuts against the bottom surface of the groove 315. The part of the connecting piece 22 that is welded to the welding surface 311 is located on the side of the welding surface 311 that is away from the electrode body 21. In order to make the connection area between the bottom surface of the groove 315 and the connecting piece 22 larger, the bottom surface of the groove 315 can be a plane.

[0105] In the above embodiment, the connecting piece 22 is inserted into the through hole 3131 and connected to the welding surface 311, so that the connecting piece 22 is welded to the bottom wall 313 more firmly and the quality of the weld 312 is easier to inspect.

[0106] Please see Figures 5-8 In some embodiments, the electrode assembly 30 includes an electrode cover plate 32 disposed in the opening of the groove 315. Specifically, the shape of the electrode cover plate 32 matches the shape of the groove 315, and the electrode cover plate 32 can seal the opening of the groove 315. The electrode cover plate 32 and the electrode body 31 can be fixed by welding, so that the electrode cover plate 32 and the electrode body 31 can be electrically connected.

[0107] The terminal cover 32 and the terminal body 31 can be made of the same material, making it easier to weld and fix them together. For example, both the terminal cover 32 and the terminal body 31 can be made of aluminum. The terminal cover 32 can be connected to electrical connectors such as aluminum foil to achieve series and parallel connections between multiple sodium-ion battery cells 100.

[0108] Because the pole body 31 is provided with a groove 315, the end face area of ​​the pole body 31 is small. In the above embodiment, the surface of the pole cover plate 32 is large, and the welding with external parts is stable, which is conducive to the electrical connection between the pole body 31 and the external parts through the pole cover plate 32.

[0109] Please see Figure 5 In some embodiments, a limiting platform 316 is provided on the side of the groove 315, and the pole cover plate 32 is disposed on the limiting platform 316. Specifically, the limiting platform 316 has a limiting surface. After the pole cover plate 32 abuts against the limiting platform 316, the pole cover plate 32 can be at least partially accommodated in the groove 315. The degree of freedom of the pole cover plate 32 along the depth of the groove 315 is restricted, and it cannot move deeper into the groove 315. In this way, the limiting platform 316 can restrict the position of the pole cover plate 32, which is beneficial for welding the pole cover plate 32 to the pole body 31.

[0110] In some embodiments, the end face of the pole cover plate 32 is flush with the end face of the pole body 31, so that the pole cover plate 32 and the pole body 31 together form a large plane, which is beneficial for welding the pole cover plate 32 to external parts.

[0111] like Figures 9-12 As shown, in some embodiments, the groove 315 can be omitted. In this case, the electrode body 31 can be block-shaped, and the welding surface 311 is the end face of the electrode body 31 facing away from the electrode body 21.

[0112] Please see Figure 5 and Figure 6 In some embodiments, the pole assembly 30 includes a first insulating member 33 disposed on the first side plate 12, the first insulating member 33 isolating the first side plate 12 and the pole body 31.

[0113] Specifically, the first insulating member 33 can be made of insulating materials such as plastic. The first insulating member 33 can be annular and surround the pole body 31. The first insulating member 33 can be partially located between the end face of the first side plate 12 and the pole body 31 to insulate the first side plate 12 and the pole body 31 in the thickness direction of the first side plate 12.

[0114] Furthermore, the pole body 31 passes through the first side plate 12, and the first insulating member 33 can be partially located between the side of the pole and the opening of the first side plate 12, thereby insulating the first side plate 12 and the pole body 31 in a direction perpendicular to the thickness of the first side plate 12.

[0115] In the above embodiment, the first insulating member 33 isolates the first side plate 12 and the pole body 31, which can reduce the risk of short circuit between the first side plate 12 and the pole body 31.

[0116] Please see Figures 7-10 In some embodiments, the pole assembly 30 includes a transition structure 34 and a first insulating member 33. The transition structure 34 is disposed on the first side plate 12, the pole body 31 is disposed on the transition structure 34, and the first insulating member 33 is disposed on the transition structure 34 and isolates the transition structure 34 and the pole body 31.

[0117] Specifically, the adapter structure 34 surrounds the entire circumference of the electrode body 31, thereby connecting the electrode body 31 and the first side plate 12 in the outer peripheral area of ​​the electrode body 31. The first insulating member 33 insulates the mating position between the adapter structure 34 and the electrode body 31, preventing a short circuit between the electrode body 31 and the adapter structure 34. The connection method between the adapter structure 34 and the first side plate 12 is not limited; for example, it can be welded, riveted, drilled, or glued.

[0118] In the above embodiments, the electrode assembly 30 has a simple structure and is easy to manufacture. Because it includes a transition structure 34 and a first insulating member 33, the shape and size of the electrode body 31 and the transition structure 34 can be designed separately based on different factors to flexibly adapt to the connection requirements of different types of housing assemblies 10 and electrode assemblies 20, thus increasing the applicability of the electrode assembly 30. The transition structure 34 helps to keep the electrode body 31 in a stable position, and the first insulating member 33 isolates the transition structure 34 and the electrode body 31, reducing the risk of short circuit between the first side plate 12 and the electrode body 31.

[0119] Please see Figure 8 and Figure 9In some embodiments, the adapter structure 34 includes a first adapter 341 and a second adapter 342 connected to the first adapter 341. The first adapter 341 is disposed on the first side plate 12. The second adapter 342 presses against the pole body 31 through a first insulating member 33. The first insulating member 33 wraps at least part of the second adapter 342 and isolates the second adapter 342 from the pole body 31.

[0120] For example, the first adapter 341 and the second adapter 342 can be connected by welding, riveting, drilling, or bonding. The first adapter 341 is connected to the first side plate 12 by welding, riveting, drilling, or bonding. For example, both the first adapter 341 and the second adapter 342 are made of aluminum and are welded together, and the first adapter 341 and the first side plate 12 are both made of aluminum and are welded together, which helps to improve the welding yield.

[0121] The method by which the second adapter 342 is insulated from and fixedly fitted to the pole body 31 via the first insulating member 33 is not limited. For example, the first insulating member 33 and the second adapter 342 can be injection molded separately. Alternatively, at least a portion of the first insulating member 33 can be sandwiched between the second adapter 342 and the pole body 31 along the inward and outward directions of the first housing wall. The material of the first insulating member 33 is not limited; for example, it can be a plastic part or an elastic rubber part.

[0122] In the above embodiments, the adapter structure 34 includes a first adapter 341 and a second adapter 342 that are assembled and connected, thereby facilitating the assembly and connection of the adapter structure 34 with the first insulating member 33 and the pole body 31, making the pole assembly 30 easy to process and manufacture.

[0123] Please see Figure 8 and Figure 9 In some embodiments, the pole assembly 30 includes a seal 35 disposed between the first adapter 341 and the pole body 31, the seal 35 sealing the gap between the first adapter 341 and the pole body 31.

[0124] Specifically, the seal 35 is made of a material that has both sealing and insulating properties, such as an elastic rubber component. The pole body 31 passes through the first adapter 341, and the first insulating member 33 may be partially located between the side of the pole and the opening of the first adapter, thereby insulating the first adapter 341 and the pole body 31 in a direction perpendicular to the thickness of the first side plate 12.

[0125] In the above embodiment, the seal 35 seals the gap between the first adapter 341 and the pole body 31, which can improve the sealing effect between the pole body 31 and the first adapter 341, improve the leakage problem at the mating position of the first adapter 341 and the pole body 31, and achieve the effect of insulation between the first adapter 341 and the pole body 31.

[0126] Please see Figure 7 and Figure 10 In some implementations, the adapter structure 34 can be an integral structure.

[0127] Please see Figure 7 and Figure 10 In some embodiments, the pole assembly 30 includes a second insulating member 36 disposed on the adapter structure 34. The second insulating member 36 is located in the receiving chamber 11 and isolates the connecting piece 22 and the pole body 31 from the adapter structure 34, respectively.

[0128] Specifically, the second insulating member 36 can be made of insulating materials such as plastic. The second insulating member 36 can be annular and surround the pole body 31. The second insulating member 36 can be partially located between the connecting piece 22 and the pole body 31 to insulate the connecting piece 22 and the pole body 31 in the thickness direction of the first side plate 12. Furthermore, since the second insulating member 36 covers most of the transition structure 34, the pole body 31 can be isolated from the transition structure 34.

[0129] In the above embodiments, the second insulating member 36 can reduce the risk of short circuits formed between the connecting piece 22, the pole body 31 and the adapter structure 34.

[0130] Please see Figure 5 , Figure 6 , Figures 8-10 In some embodiments, the sodium-ion battery cell 100 includes an insulating support 40, which is connected to the first side plate 12 and located between the first side plate 12 and the electrode body 21.

[0131] Specifically, the insulating bracket 40 abuts against the end of the first side plate 12 facing the electrode body 21. The insulating bracket 40 can indirectly support the free end of the connecting piece 22 through the first side plate 12, thereby improving the reliability of supporting the free end of the connecting piece 22, further reducing the probability of the connecting piece 22 being inserted into the electrode body 21 and contacting the first side plate 12, reducing the risk of short circuit, and improving the reliability of the sodium-ion battery cell 100.

[0132] In the above embodiment, since the insulating support 40 is located between the first side plate 12 and the electrode body 21, the insulating support 40 can insulate and separate the electrode body 21 from the first side plate 12, reducing the risk of short circuit between the first side plate 12 and the electrode body 21 and improving the reliability of the sodium-ion battery cell 100.

[0133] like Figure 9 As shown, in some embodiments, the insulating support 40 is provided with a through hole 41, and the connecting piece 22 passes through the through hole 41. In the above embodiments, the through hole 41 allows the connecting piece 22 to be connected to the electrode body 31. Since the connecting piece 22 passes through the through hole 41, the insulating support 40 can provide a certain support for the connecting piece 22. The insulating support 40 can insulate the free end of the connecting piece 22 from the electrode body 21, reduce the risk of the free end of the connecting piece 22 being inserted into the electrode body 21, reduce the risk of short circuit, and improve the reliability of the sodium-ion battery cell 100.

[0134] Please see Figure 6 and Figure 11 In some embodiments, the outer periphery of the pole body 31 is provided with a riveting part 317, and the pole assembly 30 includes a riveting block 37, which is connected to the riveting part 317.

[0135] Specifically, the rivet block 37 surrounds the outer periphery of the electrode body 31, and the rivet block 37 and the rivet part 317 can be riveted together, so that the electrode body 31 will not move into the receiving chamber 11. Therefore, in the above embodiment, the rivet block 37 can restrict the position of the electrode body 31, so that the position of the electrode body 31 is stable and the reliability of the sodium-ion battery cell 100 is improved.

[0136] In some embodiments, the connecting piece 22 includes a tab, a current collector, or an adapter piece. For example, the connecting piece 22 may be at least a portion of a tab extending from the electrode body 21 to the electrode post body 31. Alternatively, the connecting piece 22 may be a current collector, with a portion within the electrode body 21 and another portion extending to the electrode post body 31. Yet another example is that the connecting piece 22 may be an adapter piece, which can connect the tab of the electrode assembly to the electrode post body 31.

[0137] In the above embodiments, the connecting piece 22 can adopt a specific structure to connect the electrode body 21 and the electrode post body 31, so as to facilitate the welding of the connecting piece 22 and the electrode post body 31.

[0138] Please combine Figure 5 , Figure 12 and Figure 13 This application also provides a manufacturing method for manufacturing a sodium-ion battery cell 100 according to any of the above embodiments. The manufacturing method includes:

[0139] S01, Install the pole assembly 30 on the first side plate 12;

[0140] S02, insert the electrode assembly 20 into the receiving chamber 11;

[0141] S03, connect the connecting piece 22 to the welding surface 311 of the pole body 31;

[0142] S04, weld the pole body 31 to the connecting piece 22 and form a weld 312 on the welding surface 311.

[0143] Specifically, in step S01, the pole assembly 30 can be installed on the first side plate 12 from the side of the first side plate 12 away from the receiving chamber 11, or it can be installed on the first side plate 12 through the receiving chamber 11.

[0144] In step S02, if the first side plate 12 is an independently formed part, the electrode assembly 20 can be installed into the receiving chamber 11 before the first side plate 12 is installed. If the first side plate 12 and the other structures of the housing assembly 10 are an integral structure, the electrode assembly 20 can be installed into the receiving chamber 11 from the side of the first side plate 12 facing the receiving chamber 11. The order of steps S02 and S01 is not limited.

[0145] In step S03, after the pole assembly 30 or electrode assembly 20 is installed in place, the connecting piece 22 is connected to the welding surface 311 of the pole body 31.

[0146] In step S04, the electrode body 31 and the connecting piece 22 can be welded from the side of the electrode body 31 away from the receiving chamber 11 using a laser, thereby forming a weld 312 on the welding surface 311.

[0147] In the manufacturing method of the above embodiment, the electrode body 31 and the connecting piece 22 can be welded from the outside of the sodium-ion battery cell 100, thereby improving the welding efficiency of the electrode body 31 and the connecting piece 22 and helping to reduce the production cost of the sodium-ion battery cell 100.

[0148] Please combine Figure 5 , Figure 12 and Figure 13 In some embodiments, the pole body 31 includes a bottom wall 313 and a side wall 314 connected to the bottom wall 313. The bottom wall 313 and the side wall 314 surround to form a groove 315. The bottom surface of the groove 315 is a welding surface 311. The bottom wall 313 is provided with a through hole 3131 that penetrates the bottom wall 313 along the thickness direction of the bottom wall 313.

[0149] Connecting the connecting piece 22 to the welding surface 311 of the pole body 31 (step S03) includes:

[0150] The connecting piece 22 is passed through the through hole 3131 and bent and overlapped on the welding surface 311.

[0151] In the above embodiment, the connecting piece 22 passes through the through hole 3131 and is connected to the welding surface 311, so that the connecting piece 22 is welded to the bottom wall 313 more firmly and the quality of the weld 312 is easier to inspect.

[0152] Please combine Figure 5 , Figure 12 and Figure 13 In some embodiments, the electrode body 31 includes a bottom wall 313 and a side wall 314 connected to the bottom wall 313. The bottom wall 313 and the side wall 314 enclose a groove 315. The bottom surface of the groove 315 is a welding surface 311. The sodium-ion battery cell 100 includes an insulating support 40. The insulating support 40 is connected to the first side plate 12 and is located between the first side plate 12 and the electrode body 21. The insulating support 40 is provided with a through hole 41.

[0153] Connecting the connecting piece 22 to the welding surface 311 of the pole body 31 (step S03) includes:

[0154] The connecting piece 22 is passed through the through hole 41 and bent and overlapped on the surface of the bottom wall 313 facing the electrode body 21.

[0155] In the above embodiment, the connecting piece 22 overlaps the surface of the bottom wall 313 facing the electrode body 31, which simplifies the structure of the electrode body 31 and reduces the manufacturing cost of the sodium-ion battery cell 100.

[0156] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A sodium-ion battery cell, characterized in that, include: A housing assembly having a receiving chamber and including a first side plate; An electrode assembly is housed in the receiving chamber, the electrode assembly including an electrode body and a connecting piece connected to the electrode body; An electrode assembly is disposed on the first side plate. The electrode assembly includes a plurality of spaced electrode bodies. The electrode bodies are connected to the electrode body via connecting pieces. The plurality of electrode bodies are made of the same material. The connecting pieces are made of the same material as the electrode bodies. Each electrode body includes a welding surface facing away from the electrode body. The electrode body is welded to the connecting pieces, and a weld is formed on the welding surface.

2. The sodium-ion battery cell according to claim 1, characterized in that, The pole body is made of a single material.

3. The sodium-ion battery cell according to claim 2, characterized in that, The pole body and the connecting piece are made of one of the following materials: aluminum, copper, nickel, and titanium.

4. The sodium-ion battery cell according to claim 1, characterized in that, The pole body includes a bottom wall and a side wall connected to the bottom wall. The bottom wall and the side wall enclose a groove, and the bottom wall has the welding surface.

5. The sodium-ion battery cell according to claim 4, characterized in that, The bottom surface of the groove is the welding surface, the connecting piece abuts against the bottom wall surface facing the electrode body, and the weld penetrates the bottom wall.

6. The sodium-ion battery cell according to claim 4, characterized in that, The bottom surface of the groove is the welding surface, and the bottom wall is provided with a through hole that extends through the bottom wall along the thickness direction of the bottom wall. The connecting piece passes through the through hole and is connected to the welding surface.

7. The sodium-ion battery cell according to claim 4, characterized in that, The pole assembly includes a pole cover plate, which is disposed in the opening of the groove.

8. The sodium-ion battery cell according to claim 7, characterized in that, The groove has a limiting platform on its side, and the pole cap is placed on the limiting platform.

9. The sodium-ion battery cell according to claim 1, characterized in that, The pole assembly includes a first insulating member disposed on the first side plate, the first insulating member isolating the first side plate and the pole body.

10. The sodium-ion battery cell according to claim 1, characterized in that, The pole assembly includes a transition structure and a first insulating member. The transition structure is disposed on the first side plate, the pole body is disposed on the transition structure, and the first insulating member is disposed on the transition structure and isolates the transition structure and the pole body.

11. The sodium-ion battery cell according to claim 10, characterized in that, The adapter structure includes a first adapter and a second adapter connected to the first adapter. The first adapter is disposed on the first side plate. The second adapter presses against the pole body through the first insulating member. The first insulating member wraps around at least part of the second adapter and isolates the second adapter from the pole body.

12. The sodium-ion battery cell according to claim 11, characterized in that, The pole assembly includes a seal disposed between the first adapter and the pole body, the seal sealing the gap between the first adapter and the pole body.

13. The sodium-ion battery cell according to any one of claims 10-12, characterized in that, The pole assembly includes a second insulating member disposed on the adapter structure. The second insulating member is located in the receiving chamber and isolates the connecting piece and the pole body from the adapter structure, respectively.

14. The sodium-ion battery cell according to claim 9, characterized in that, The sodium-ion battery cell includes an insulating support that is connected to the first side plate and located between the first side plate and the electrode body.

15. The sodium-ion battery cell according to claim 14, characterized in that, The insulating bracket is provided with a through hole, and the connecting piece passes through the through hole.

16. The sodium-ion battery cell according to claim 1, characterized in that, The outer periphery of the pole body is provided with a riveting part, and the pole assembly includes a riveting block, which is connected to the riveting part.

17. The sodium-ion battery cell according to claim 1, characterized in that, The connecting piece includes a tab, a current collector, or an adapter piece.

18. A battery device, characterized in that, Includes sodium-ion battery cells as described in any one of claims 1-17.

19. An electrical appliance, wherein, Includes the sodium-ion battery cell according to any one of claims 1-17, or the battery device according to claim 18.

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