Battery monomer and electric equipment

Abstract

The utility model relates to a battery monomer and electric equipment. Comprising a shell provided with a containing cavity, and the containing cavity is provided with an opening in the first direction; the battery cell is positioned in the accommodating cavity of the shell; the pole column is configured to lead out electric energy of the battery cell; the electric adapter is configured to electrically connect the battery cell with the pole; a first clamping structure electrically connected with the electric adapter is arranged on the bottom surface of the pole, and the first clamping structure comprises a first clamping matching surface extending along a first direction; a second clamping structure matched with the first clamping structure is arranged on the top surface of the electric adapter, and the second clamping structure comprises a second clamping matching surface extending in the first direction; a clamping gap is formed between the first clamping matching surface and the second clamping matching surface in the second direction, and a welding seam formed by welding is included in the clamping gap; the second direction is perpendicular to the first direction. According to the technical scheme, the electrical connection performance and the electrical connection stability of the electrical adapter and the pole are improved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and in particular to a battery cell and an electrical device. Background Technology

[0002] Lithium-ion batteries, as a new energy source, are playing an increasingly important role in energy storage and power. Lithium-ion batteries are generally composed of individual battery cells forming battery modules. Each battery cell includes a casing, a cell, electrical connectors, and a top cover assembly. The electrical connectors electrically connect the cell and the top cover assembly, specifically connecting the tabs of the cell to the terminals of the top cover assembly. Laser-guided welding is used to connect the electrical connectors and terminals. However, during welding, the excessively tight contact between the electrical connectors and terminals prevents the gas generated during laser welding from escaping, easily leading to bursts during the welding process and reducing the performance and stability of the electrical connection. Utility Model Content

[0003] In view of this, this application provides a battery cell and an electrical device to solve at least one problem existing in the prior art.

[0004] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0005] In a first aspect, embodiments of this application provide a battery cell, the battery cell comprising:

[0006] The housing has a receiving cavity, the receiving cavity having an opening in a first direction;

[0007] The battery cell is located in the accommodating cavity of the housing;

[0008] The terminal is configured to draw out the electrical energy of the battery cell;

[0009] An electrical adapter is configured to electrically connect a battery cell to a terminal post; the bottom surface of the terminal post is provided with a first snap-fit ​​structure for electrically connecting the electrical adapter, the first snap-fit ​​structure including a first snap-fit ​​mating surface extending along a first direction; the top surface of the electrical adapter is provided with a second snap-fit ​​structure that mates with the first snap-fit ​​structure, the second snap-fit ​​structure including a second snap-fit ​​mating surface extending along the first direction.

[0010] The first and second snap-fit ​​surfaces have a snap-fit ​​gap in a second direction, and the snap-fit ​​gap includes a weld formed by welding; the second direction is perpendicular to the first direction.

[0011] In conjunction with the first aspect of this application, in an optional embodiment, the first snap-fit ​​structure includes a spiral groove or a spiral protrusion with a trajectory of a planar spiral line, and the sidewall of the spiral groove or the spiral protrusion is the first snap-fit ​​mating surface; the second snap-fit ​​structure includes a spiral protrusion or a spiral groove with a trajectory of a planar spiral line, and the sidewall of the spiral protrusion or the spiral groove is the second snap-fit ​​mating surface.

[0012] In conjunction with the first aspect of this application, in an optional embodiment, the first snap-fit ​​structure includes a plurality of rectangular grooves or rectangular protrusions arranged at intervals along the same direction to form comb-shaped grooves or comb-shaped protrusions, the sidewalls of the rectangular grooves or rectangular protrusions being the first snap-fit ​​mating surfaces; the second snap-fit ​​structure includes a plurality of rectangular protrusions or rectangular grooves arranged at intervals along the same direction to form comb-shaped protrusions or comb-shaped grooves, the sidewalls of the rectangular protrusions or rectangular grooves being the second snap-fit ​​mating surfaces.

[0013] In conjunction with the first aspect of this application, in an optional embodiment, the first snap-fit ​​structure is an arc-shaped groove or an arc-shaped protrusion, the sidewall of the arc-shaped groove or the arc-shaped protrusion being the first snap-fit ​​mating surface; the second snap-fit ​​structure is an arc-shaped protrusion or an arc-shaped groove, the sidewall of the arc-shaped protrusion or the arc-shaped groove being the second snap-fit ​​mating surface.

[0014] In conjunction with the first aspect of this application, in an alternative embodiment, the snap-fit ​​gap is greater than or equal to the width of the weld required for welding.

[0015] In conjunction with the first aspect of this application, in an optional embodiment, the surface roughness of the first snap-fit ​​surface and the second snap-fit ​​surface is Ra3.2 micrometers to Ra12.5 micrometers.

[0016] In conjunction with the first aspect of this application, in an alternative embodiment, the pole post includes:

[0017] A column, extending along a first direction, to draw out the electricity from the battery cell;

[0018] A connecting plate is located at one end of the column near the electrical adapter and is electrically connected to the column. The first snap-fit ​​structure is disposed on the outer end face of the connecting plate.

[0019] In conjunction with the first aspect of this application, in an optional embodiment, the battery cell further includes:

[0020] A top cover plate, wherein the pole post is mounted on the top cover plate to form a top cover assembly;

[0021] Plastic sheets are stacked and installed at the bottom end of the top cover plate;

[0022] The plastic sheet has a recessed area at one end near the electrical adapter, which is recessed along a first direction, and the electrical adapter is at least partially embedded in the recessed area.

[0023] In conjunction with the first aspect of this application, in an optional embodiment, the battery cell further includes:

[0024] An insulating element is located between the pole post and the top cover plate, with one side of the insulating element abutting the pole post and the other side abutting the top cover plate.

[0025] Secondly, embodiments of this application provide an electrical device including the battery cell described above.

[0026] The battery cell and electrical device provided in this application embodiment include: a housing having a receiving cavity with an opening in a first direction; a battery cell located in the receiving cavity of the housing; a terminal post configured to lead out the electrical energy of the battery cell; and an electrical adapter configured to electrically connect the battery cell to the terminal post. The bottom surface of the terminal post is provided with a first snap-fit ​​structure electrically connecting the electrical adapter, the first snap-fit ​​structure including a first snap-fit ​​mating surface extending along a first direction; the top surface of the electrical adapter is provided with a second snap-fit ​​structure that mates with the first snap-fit ​​structure, the second snap-fit ​​structure including a second snap-fit ​​mating surface extending along the first direction; the first snap-fit ​​mating surface and the second snap-fit ​​mating surface have a snap-fit ​​gap in a second direction, the snap-fit ​​gap including a weld formed by welding; the second direction is perpendicular to the first direction. As can be seen, the battery cell and electrical device of this application embodiment have a first snap-fit ​​structure on the terminal post that is electrically connected to the electrical adapter, and a second snap-fit ​​structure on the top surface of the electrical adapter that cooperates with the first snap-fit ​​structure; the first snap-fit ​​structure and the second snap-fit ​​structure have a snap-fit ​​gap in a second direction, and the snap-fit ​​gap includes a weld formed by welding; that is, the terminal post and the electrical adapter are butt-welded, eliminating the need for through welding, reducing welding power, lowering the possibility of bursting, and increasing the electrical connection performance and stability between the electrical adapter and the terminal post. Therefore, the battery cell and electrical device of this application embodiment increase the electrical connection performance and stability between the electrical adapter and the terminal post.

[0027] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0028] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0029] Figure 1An exploded view (disassembly diagram) of a single battery cell provided in an embodiment of this application;

[0030] Figure 2 A schematic diagram of one embodiment of the top cover assembly in a battery cell provided in this application;

[0031] Figure 3 A schematic diagram of the electrode posts in a single battery cell provided in this application embodiment;

[0032] Figure 4 for Figure 2 A magnified view of a portion of point A in the middle;

[0033] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle;

[0034] Figure 6 A schematic diagram of one embodiment of the electrical adapter in a battery cell provided in this application;

[0035] Figure 7 for Figure 2 Top cover assembly and Figure 6 A schematic diagram of the electrical adapter after electrical connection;

[0036] Figure 8 A schematic diagram of another embodiment of the top cover assembly in a battery cell provided in this application;

[0037] Figure 9 A schematic diagram of another embodiment of the electrical adapter in a battery cell provided in this application;

[0038] Figure 10 for Figure 8 Top cover assembly and Figure 9 A schematic diagram of the electrical adapter after electrical connection;

[0039] Figure 11 A schematic diagram of yet another embodiment of the top cover assembly in a battery cell provided in this application;

[0040] Figure 12 A schematic diagram of yet another embodiment of the electrical adapter in a battery cell provided in this application;

[0041] Figure 13 for Figure 11 Top cover assembly and Figure 12 A schematic diagram of the electrical adapter after electrical connection.

[0042] Explanation of reference numerals in the attached figures:

[0043] 10. Housing; 20. Battery cell; 30. Electrical adapter; 31. Electrode connection part; 32. Electrode post connection part; 321. Second snap-fit ​​mating surface; 40. Top cover assembly; 41. Top cover plate; 42. Electrode post; 421. Connecting plate; 4211. First snap-fit ​​mating surface; 422. Column; 43. Plastic sheet; 44. Insulating component. Detailed Implementation

[0044] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.

[0045] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.

[0046] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In the description of this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.

[0047] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction 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.

[0048] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0049] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0050] To address the technical problems in related technologies, embodiments of this application provide a single battery cell. (See reference...) Figure 1 The battery cell includes:

[0051] The housing 10 has a receiving cavity, and the receiving cavity has an opening in a first direction;

[0052] The battery cell 20 is located in the receiving cavity of the housing 10;

[0053] The terminal post 42 is configured to draw out the electrical energy of the battery cell 20;

[0054] An electrical adapter 30 is configured to electrically connect a battery cell 20 to a terminal post 42. The bottom surface of the terminal post 42 is provided with a first snap-fit ​​structure for electrically connecting the electrical adapter 30. The first snap-fit ​​structure includes a first snap-fit ​​mating surface 4211 extending along a first direction. The top surface of the electrical adapter 30 is provided with a second snap-fit ​​structure that mates with the first snap-fit ​​structure. The second snap-fit ​​structure includes a second snap-fit ​​mating surface 321 extending along the first direction.

[0055] The first snap-fit ​​surface 4211 and the second snap-fit ​​surface 321 have a snap-fit ​​gap in the second direction, and the snap-fit ​​gap includes a weld formed by welding; the second direction is perpendicular to the first direction.

[0056] The shape of the battery cell includes square, cylindrical and pouch, etc. The cell 20 includes single cell 20 and multi-cell 20. The preparation of the cell 20 includes winding and stacking. The embodiments of this application mainly take single cell 20, square battery cell, and winding as the preparation method as an example.

[0057] Understandably, the casing 10 of the square battery cell is square, that is, it has a cuboid accommodating cavity. Furthermore, for the square battery cell, the first direction is the vertical direction of the casing 10; that is, the top of the casing 10 is open, and the terminal post 42 is located at the top of the casing 10.

[0058] Understandably, the battery cell also includes a top cover plate 41, and terminal posts 42 are mounted on the top cover plate 41 to form a top cover assembly 40. The top cover assembly 40 is mounted on the housing 10 with the terminal posts facing upwards, i.e., the terminal posts are above the battery cell. Specifically, both the upper and lower ends of the terminal posts 42 protrude from the top cover plate 41. The structure of the top cover assembly 40 is shown in the reference diagram. Figure 2 Structural reference of pole post 42 Figure 3 .in, Figure 2 This is a top view, similar to the previous one. Figure 7 , Figure 8 , Figure 10 , Figure 11 and Figure 13 All of these are top views.

[0059] refer to Figure 4 The first snap-fit ​​structure includes a first snap-fit ​​mating surface 4211 extending along a first direction. The first snap-fit ​​mating surface extends along the first direction, i.e., it is vertically arranged, which facilitates snap-fit ​​with the electrical adapter 30 in the vertical direction.

[0060] The first snap-fit ​​surface 4211 and the second snap-fit ​​surface 321 have a snap-fit ​​gap in the second direction, which facilitates the welding of the first snap-fit ​​structure and the second snap-fit ​​structure by butt welding. Therefore, the snap-fit ​​gap includes a weld formed by welding. The weld is formed by melting welding flux, connecting the first snap-fit ​​surface 4211 and the second snap-fit ​​surface together.

[0061] Specifically, the snap-fit ​​gap can exist in a portion of the snap-fit ​​mating surface, such as a gap in the middle but not at the ends; or multiple areas with snap-fit ​​gaps can appear at intervals along the length of the snap-fit ​​mating surface. This allows for both a secure snap-fit ​​and butt welding. The snap-fit ​​mating surface is a collective term for the first snap-fit ​​mating surface and the second snap-fit ​​mating surface.

[0062] Further reference Figure 5 The surface roughness of the first snap-fit ​​mating surface 4211 is relatively high, which is beneficial for the dissipation of gases generated during welding. Similarly, the surface roughness of the second snap-fit ​​mating surface 321 is also relatively high. Understandably, Figure 5 The image only illustrates that the roughness of the first snap-fit ​​surface 4211 is relatively high; the actual surface micro-texture shape is not shown.

[0063] In this embodiment of the battery cell, a first snap-fit ​​structure that is electrically connected to the electrical adapter 30 is provided on the terminal post 42, and a second snap-fit ​​structure that cooperates with the first snap-fit ​​structure is provided on the top surface of the electrical adapter 30; the first snap-fit ​​structure and the second snap-fit ​​structure are snapped together in a second direction, and the snap-fit ​​gap includes a weld formed by welding; that is, the terminal post 42 and the electrical adapter 30 are butt-welded, without the need for through welding, reducing welding power, reducing the possibility of bursting, and increasing the electrical connection performance and electrical connection stability between the electrical adapter 30 and the terminal post 42.

[0064] Furthermore, since the electrical adapter 30 and the pole 42 are snapped together during welding, their relative positions are relatively stable, which improves the welding quality and the consistency of the weld.

[0065] Furthermore, before welding, the electrical adapter 30 is snapped into the electrode post 42. This reduces the space occupied by the electrical adapter 30 in the vertical direction, improving space utilization. It also increases the connection strength between the electrical adapter 30 and the electrode post 42, resulting in more stable welding quality.

[0066] In other embodiments of this application, reference is made to Figure 4 The first snap-fit ​​structure includes a spiral groove or spiral protrusion with a trajectory of a planar spiral line, and the sidewall of the spiral groove or spiral protrusion is the first snap-fit ​​mating surface 4211; Reference Figure 6 The second snap-fit ​​structure includes a spiral protrusion or a spiral groove with a trajectory of a planar spiral line, and the sidewall of the spiral protrusion or the spiral groove is the second snap-fit ​​mating surface 321.

[0067] The connection is made using a planar spiral method, which provides a more stable connection and facilitates welding. Understandably, the electrical adapter 30 can be welded to the terminal 42 of the top cover assembly 40, and then the entire top cover assembly 40 can be electrically connected to the battery cell 20. Therefore, the top cover assembly 40 can be flipped over, with its bottom surface facing up, to be snapped and welded to the electrical adapter 30. See the top cover assembly 40 with the terminal 42 and electrical adapter 30 assembled. Figure 7 .

[0068] In other embodiments of this application, reference is made to Figure 8 The first snap-fit ​​structure includes multiple rectangular grooves or rectangular protrusions arranged at intervals along the same direction to form comb-shaped grooves or protrusions, and the sidewalls of the rectangular grooves or protrusions are the first snap-fit ​​mating surfaces 4211; Reference Figure 9 The second snap-fit ​​structure includes multiple rectangular protrusions or rectangular grooves arranged at intervals along the same direction to form comb-shaped protrusions or comb-shaped grooves, and the sidewalls of the rectangular protrusions or rectangular grooves are the second snap-fit ​​mating surfaces 321.

[0069] The rectangular snap-fit ​​design is simple in structure, low in processing cost, and easy to weld. See also the top cover assembly 40, which completes the assembly of the pole post 42 and the electrical adapter 30. Figure 10 .

[0070] In other embodiments of this application, reference is made to Figure 11 The first snap-fit ​​structure is an arc-shaped groove or arc-shaped protrusion, and the sidewall of the arc-shaped groove or the arc-shaped protrusion is the first snap-fit ​​mating surface 4211; Reference Figure 12 The second snap-fit ​​structure is an arc-shaped protrusion or an arc-shaped groove, and the sidewall of the arc-shaped protrusion or the arc-shaped groove is the second snap-fit ​​mating surface 321.

[0071] The arc-shaped snap-fit ​​design results in a simple structure, low processing cost, and a secure connection. The electrical adapter 30 also boasts high strength and is easy to weld. See the top cover assembly 40, which completes the assembly of the pole post 42 and the electrical adapter 30. Figure 13 .

[0072] In some other embodiments of this application, the snap-fit ​​gap is greater than or equal to the width of the weld required for welding.

[0073] This facilitates the implementation of the welding process and reduces the impact on the electrical adapter 30 or pole 42 during the welding process.

[0074] In some other embodiments of this application, the surface roughness of the first snap-fit ​​surface 4211 and the second snap-fit ​​surface 321 is Ra 3.2 μm to Ra 12.5 μm. Optionally, the roughness can be 3.2 μm, 3.3 μm, 3.4 μm, 3.5 μm... 12.1 μm, 12.2 μm, 12.3 μm, 12.4 μm, 12.5 μm, etc.

[0075] In this way, the two mating surfaces have sufficient roughness to allow the gases generated during welding to escape.

[0076] Understandably, the first snap-fit ​​surface 4211 and the second snap-fit ​​surface 321 can be formed by machining, or by chemical or electrochemical treatment.

[0077] In other embodiments of this application, reference is made to Figure 3 The pole post 42 includes:

[0078] The column 422 extends along the first direction to draw out the electricity from the cell 20;

[0079] A connecting plate 421 is located at one end of the column 422 near the electrical adapter 30 and is electrically connected to the column 422. The first snap-fit ​​structure is disposed on the outer end face of the connecting plate 421.

[0080] This facilitates installation on the top cover plate 41 to form the top cover assembly 40. Specifically, the post 422 passes through the top cover plate 41 and protrudes from the top surface of the top cover plate 41, while the bottom end of the connecting plate 421 protrudes from or is flush with the top cover plate 41. This facilitates both the external electrical connection of the pole post 42 and the electrical connection between the pole post 42 and the electrical adapter 30.

[0081] In other embodiments of this application, reference is made to Figure 6 , Figure 9 , Figure 12 The electrical adapter 30 includes a tab connection portion 31 and a post connection portion 32. The tab connection portion 31 is electrically connected to the tab, and the post connection portion 32 is electrically connected to the post. The post connection portion 32 and the tab connection portion 31 can be integrally formed or assembled, which will not be described in detail.

[0082] In other embodiments of this application, the battery cell further includes:

[0083] Plastic sheet 43 is stacked and installed at the bottom end of the top cover plate 41;

[0084] The plastic sheet 43 has a recessed area at one end near the electrical adapter 30, which is recessed in a first direction, and the electrical adapter 30 is at least partially embedded in the recessed area.

[0085] The recessed area allows the portion of the electrical adapter 30, excluding the second snap-fit ​​structure, to be embedded in the top cover assembly 40, reducing the space occupied by the electrical adapter 30 in the vertical direction and improving space utilization.

[0086] In addition, the plastic plate 43 is an insulating material, which reduces the risk of leakage due to accidental contact between the metal parts of the top cover assembly (excluding the poles) and the battery cell 20.

[0087] In other embodiments of this application, the battery cell further includes:

[0088] An insulating element 44 is located between the pole post 42 and the top cover plate 41, with one side of the insulating element 44 abutting against the pole post 42 and the other side abutting against the top cover plate 41.

[0089] In this way, the top cover plate 41 and the terminal post 42 can be insulated and separated, preventing the terminal post 42 and the top cover plate 41 from being electrically connected, making the battery safer.

[0090] This application also provides an electrical device, including the battery cells described above. Multiple battery cells can directly supply power to the electrical device, or they can be connected in parallel, series, or a hybrid configuration to form a power supply unit, such as a battery module, to supply power to various electrical devices. The electrical device can take many forms, such as mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, power tools, or various household appliances. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0091] The electrical equipment in this embodiment of the application has a first snap-fit ​​structure on the pole 42 that is electrically connected to the electrical adapter 30, and a second snap-fit ​​structure that cooperates with the first snap-fit ​​structure is provided on the top surface of the electrical adapter 30; the first snap-fit ​​structure and the second snap-fit ​​structure are snapped together in a second direction, and the snap-fit ​​gap includes a weld formed by welding; that is, the pole 42 and the electrical adapter 30 are butt-welded, without the need for through welding, reducing welding power, reducing the possibility of bursting, and increasing the electrical connection performance and electrical connection stability between the electrical adapter 30 and the pole 42.

[0092] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations contained in this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of this application and do not limit the scope of protection of this patent application.

Claims

1. A battery cell, characterized in that, The battery cell includes: The housing has a receiving cavity, the receiving cavity having an opening in a first direction; The battery cell is located in the accommodating cavity of the housing; The terminal is configured to draw out the electrical energy of the battery cell; An electrical adapter is configured to electrically connect a battery cell to a terminal post; the bottom surface of the terminal post is provided with a first snap-fit ​​structure for electrically connecting the electrical adapter, the first snap-fit ​​structure including a first snap-fit ​​mating surface extending along a first direction; the top surface of the electrical adapter is provided with a second snap-fit ​​structure that mates with the first snap-fit ​​structure, the second snap-fit ​​structure including a second snap-fit ​​mating surface extending along the first direction. The first and second snap-fit ​​surfaces have a snap-fit ​​gap in a second direction, and the snap-fit ​​gap includes a weld formed by welding; the second direction is perpendicular to the first direction.

2. The battery cell according to claim 1, characterized in that, The first snap-fit ​​structure includes a spiral groove or a spiral protrusion with a trajectory of a planar spiral line, and the sidewall of the spiral groove or the spiral protrusion is the first snap-fit ​​mating surface; the second snap-fit ​​structure includes a spiral protrusion or a spiral groove with a trajectory of a planar spiral line, and the sidewall of the spiral protrusion or the spiral groove is the second snap-fit ​​mating surface.

3. The battery cell according to claim 1, characterized in that, The first snap-fit ​​structure includes multiple rectangular grooves or rectangular protrusions arranged at intervals along the same direction to form comb-shaped grooves or protrusions, and the sidewalls of the rectangular grooves or protrusions are the first snap-fit ​​mating surfaces; the second snap-fit ​​structure includes multiple rectangular protrusions or rectangular grooves arranged at intervals along the same direction to form comb-shaped protrusions or grooves, and the sidewalls of the rectangular protrusions or rectangular grooves are the second snap-fit ​​mating surfaces.

4. The battery cell according to claim 1, characterized in that, The first snap-fit ​​structure is an arc-shaped groove or an arc-shaped protrusion, and the sidewall of the arc-shaped groove or the arc-shaped protrusion is the first snap-fit ​​mating surface; the second snap-fit ​​structure is an arc-shaped protrusion or an arc-shaped groove, and the sidewall of the arc-shaped protrusion or the arc-shaped groove is the second snap-fit ​​mating surface.

5. The battery cell according to claim 1, characterized in that, The clamping gap is greater than or equal to the width of the weld required for welding.

6. The battery cell according to claim 1, characterized in that, The surface roughness of the first and second snap-fit ​​surfaces is Ra3.2 μm to Ra12.5 μm.

7. The battery cell according to claim 1, characterized in that, The pole includes: A column, extending along a first direction, to draw out the electricity from the battery cell; A connecting plate is located at one end of the column near the electrical adapter and is electrically connected to the column. The first snap-fit ​​structure is disposed on the outer end face of the connecting plate.

8. The battery cell according to claim 1, characterized in that, The battery cell also includes: A top cover plate, wherein the pole post is mounted on the top cover plate to form a top cover assembly; Plastic sheets are stacked and installed at the bottom end of the top cover plate; The plastic sheet has a recessed area at one end near the electrical adapter, which is recessed along a first direction, and the electrical adapter is at least partially embedded in the recessed area.

9. The battery cell according to claim 8, characterized in that, The battery cell also includes: An insulating element is located between the pole post and the top cover plate, with one side of the insulating element abutting the pole post and the other side abutting the top cover plate.

10. An electrical appliance, characterized in that, Includes the battery cell described in any one of claims 1-9.

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