Battery and electric equipment

Abstract

The utility model relates to a battery and electric equipment. The battery comprises a single battery which comprises a pole located at one end of the single battery; a first clamping structure is arranged on the surface of the pole, and the first clamping structure comprises a first clamping matching surface extending along a first direction; the electric connecting piece is configured to electrically connect two adjacent single batteries; the electric connecting piece is provided with a second clamping structure matched with the first clamping structure, 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 connector 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 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 cells forming a battery module. These individual cells are electrically connected via electrical connectors to connect their electrical energy in series or parallel, thus forming the battery module. Specifically, an individual cell includes a casing, a cell, and a top cover. The top cover includes terminals, and electrical connectors connect the terminals of adjacent individual cells, thereby enabling the individual cells to be connected in series or parallel.

[0003] The electrical connection between the electrode and the electrical connector uses a laser penetration welding process. Because the contact surfaces of the electrical connector and the electrode are too tightly fitted during welding, the gas generated by laser welding cannot escape, which can easily cause bursts during the welding process, reducing the performance and stability of the electrical connection. Utility Model Content

[0004] In view of this, this application provides a battery and an electrical device to solve at least one problem existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a battery, the battery comprising:

[0007] A single battery cell includes an electrode post located at one end of the single battery cell; the surface of the electrode post is provided with a first snap-fit ​​structure, the first snap-fit ​​structure including a first snap-fit ​​mating surface extending along a first direction;

[0008] An electrical connector is configured to electrically connect two adjacent individual battery cells; the electrical connector 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 ​​surface extending along a first direction;

[0009] 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.

[0010] 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.

[0011] 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.

[0012] 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.

[0013] 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.

[0014] 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.

[0015] In conjunction with the first aspect of this application, in an optional embodiment, the electrode post includes a first electrode post and a second electrode post; the first electrode post and the second electrode post are both disposed on the same end face of the single cell and are spaced apart in the length direction of the end face; one of the first electrode post and the second electrode post is a positive electrode post and the other is a negative electrode post.

[0016] In conjunction with the first aspect of this application, in an optional embodiment, the first snap-fit ​​structures of the first pole and the second pole have the same shape and size, and are respectively connected to different electrical connectors.

[0017] In conjunction with the first aspect of this application, in an optional embodiment, both ends of the electrical connector are provided with a second snap-fit ​​structure of the same shape and size.

[0018] Secondly, embodiments of this application provide an electrical device, including any of the batteries described above.

[0019] The battery and electrical device provided in this application embodiment include: a single battery cell, including an electrode post located at one end of the single battery cell; a first snap-fit ​​structure is provided on the surface of the electrode post, the first snap-fit ​​structure including a first snap-fit ​​mating surface extending along a first direction; an electrical connector configured to electrically connect two adjacent single batteries cell; the electrical connector 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 seam formed by welding; the second direction is perpendicular to the first direction. It can be seen that the battery and electrical device in this application embodiment, by providing a first snap-fit ​​structure on the electrode post that is electrically connected to the electrical connector, and providing a second snap-fit ​​structure on the electrical connector that mates with the first snap-fit ​​structure, and forming a snap-fit ​​gap between the first and second snap-fit ​​structures, allows for butt-seam welding within the snap-fit ​​gap, reducing welding power and facilitating the discharge of gases generated by laser welding, reducing the possibility of bursting, and increasing the electrical connection performance and stability between the electrical connector and the electrode post. Therefore, the battery and electrical device of this application embodiment improve the electrical connection performance and electrical connection stability between the electrical connector and the terminal.

[0020] 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

[0021] 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:

[0022] Figure 1 This is a schematic diagram of a battery module provided in an embodiment of this application;

[0023] Figure 2 A schematic diagram of one embodiment of the top cover provided in this application;

[0024] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0025] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0026] Figure 5 A schematic diagram of the pole post in the top cover provided in the embodiments of this application;

[0027] Figure 6A schematic diagram of one embodiment of the electrical connector provided in this application;

[0028] Figure 7 for Figure 2 The top cover and Figure 6 A schematic diagram of the electrical connections of the electrical connectors;

[0029] Figure 8 A schematic diagram of another embodiment of the top cover provided in this application;

[0030] Figure 9 A schematic diagram of another embodiment of the electrical connector provided in this application;

[0031] Figure 10 for Figure 8 The top cover and Figure 9 A schematic diagram of the electrical connections of the electrical connectors;

[0032] Figure 11 A schematic diagram of yet another embodiment of the top cover provided in this application;

[0033] Figure 12 A schematic diagram of yet another embodiment of the electrical connector provided in this application;

[0034] Figure 13 for Figure 11 The top cover and Figure 12 A schematic diagram of the electrical connection of the electrical connector.

[0035] Explanation of reference numerals in the attached figures:

[0036] 10. Single cell; 11. Top cover; 111. Cover plate; 112. Terminal post; 1121. Connecting plate; 1122. Post; 1123. First snap-fit ​​mating surface; 1124. First terminal post; 1125. Second terminal post; 20. Electrical connector; 21. Body; 22. Electrical connection part; 221. Second snap-fit ​​mating surface. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] To address the technical problems in related technologies, embodiments of this application provide a battery. (See reference...) Figures 1-4 The battery includes:

[0044] A single cell battery 10 includes a terminal post 112 located at one end of the single cell battery 10; the surface of the terminal post 112 is provided with a first snap-fit ​​structure, the first snap-fit ​​structure including a first snap-fit ​​mating surface 1123 extending along a first direction;

[0045] Electrical connector 20 is configured to electrically connect two adjacent individual battery cells 10; the electrical connector 20 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 221 extending along a first direction;

[0046] The first snap-fit ​​surface 1123 and the second snap-fit ​​surface 221 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.

[0047] In the attached diagram, Figures 1-4 , Figure 7 , Figure 8 , Figure 10 , Figure 11 and Figure 13 All are top-view projection diagrams; the rest are axonometric diagrams.

[0048] Specifically, the single battery cell 10 may include a casing, a battery cell, and a top cover 11. The top cover 11 includes a cover plate 111 and terminals 112. The cover plate 111 is used to close the casing to protect the battery cell, and the terminals 112 are used to draw out the electrical energy from the battery cell.

[0049] Specifically, the single battery 10 in this embodiment can be a square single battery, with the first direction being the vertical direction of the casing; the top of the casing of the square single battery 10 is open, and the terminal post 112 is located at the top of the casing. The first snap-fit ​​surface 1123 and the second snap-fit ​​surface 221 are arranged in the vertical direction to facilitate snap-fit ​​with the electrical connector 20 in the vertical direction.

[0050] Understandably, the terminal 112 is mounted on the cover plate 111 of the single cell 10 to form a top cover 11. The top cover 11 is mounted on the housing with the terminal 112 facing upwards, that is, the terminal 112 is above the single cell 10.

[0051] Understandably, the electrical connector 20, also referred to as a battery connector tab or tab, is used to electrically connect two or more individual battery cells 10, to connect the individual battery cells 10 in series or in parallel. The electrical connector 20 may include two or more ends, each used to electrically connect an individual battery cell 10. Each end of the electrical connector 20 may be provided with a second snap-fit ​​structure. In this way, the electrical connection between the electrical connector 20 and the individual battery cell 10 is completed through the cooperation of the first snap-fit ​​structure and the second snap-fit ​​structure.

[0052] Understandably, a weld is a seam formed by the melting and joining of metals after a welding process, electrically connecting the surfaces with a snap-fit ​​gap between the first snap-fit ​​surface 1123 and the second snap-fit ​​surface. Specifically, in this embodiment, the second snap-fit ​​surface 221 of the electrical connector 20 and the first snap-fit ​​surface 1123 of the pole 112 can be butt-welded on the basis of snap-fit ​​for better electrical connection.

[0053] Specifically, the snap-fit ​​gap can exist in a portion of the snap-fit ​​mating surface, for example, a snap-fit ​​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 1123 and the second snap-fit ​​mating surface 221.

[0054] Further reference Figure 4 The surface roughness of the mating surfaces is relatively high, which facilitates the dissipation of gases generated during welding. Understandably, Figure 4 The roughness of the mating surfaces is only shown to illustrate that the surface roughness is relatively high; the actual surface micro-texture shape is not shown.

[0055] The battery of this application embodiment has a first snap-fit ​​structure on the terminal post 112 that is electrically connected to the electrical connector 20, and a second snap-fit ​​structure on the electrical connector 20 that cooperates with the first snap-fit ​​structure, so that the first snap-fit ​​structure and the second snap-fit ​​structure form a snap-fit ​​gap, which allows butt welding to be performed within the snap-fit ​​gap, reducing welding power and facilitating the discharge of gas generated by laser welding, reducing the possibility of bursting, and increasing the electrical connection performance and electrical connection stability between the electrical connector 20 and the terminal post 112.

[0056] Furthermore, since the electrical connector 20 and the single cell 10 are snapped together during welding, their relative positions are relatively stable, which improves the welding quality and the consistency of the weld.

[0057] Furthermore, the vertical snap-fit ​​between the electrical connector 20 and the single battery cell 10 reduces the space occupied by the electrical adapter in the vertical direction, thus improving space utilization.

[0058] In other embodiments of this application, reference is made to Figure 2 and Figure 6 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 1123; 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 221.

[0059] The connection is made more stable by using a planar spiral design. Furthermore, since the terminal post 112 is above the individual battery cell 10, and the first and second engagement surfaces 1123 and 221 are vertically aligned, welding is also easier. See the top cover 11 after assembling the terminal post 112 and the electrical connector 20. Figure 7 .

[0060] In other embodiments of this application, reference is made to Figure 8 and Figure 9 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 sidewall of the rectangular grooves or rectangular protrusions is the first snap-fit ​​mating surface 1123; 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 sidewall of the rectangular protrusions or rectangular grooves is the second snap-fit ​​mating surface 221.

[0061] The rectangular snap-fit ​​design results in a simple structure and low processing cost. Similarly, the first snap-fit ​​mating surface 1123 and the second snap-fit ​​mating surface 221 are arranged vertically, making welding relatively convenient. See the top cover 11 after assembling the pole 112 and the electrical connector 20. Figure 10 .

[0062] In other embodiments of this application, reference is made to Figure 11 and Figure 12 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 1123; 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 221.

[0063] The arc-shaped snap-fit ​​design results in a simple structure, low processing cost, stable connection, and high strength of the electrical connector 20. Similarly, the first snap-fit ​​mating surface 1123 and the second snap-fit ​​mating surface 221 are arranged vertically, thus facilitating welding. See the top cover 11 after assembling the pole 112 and the electrical connector 20. Figure 13 .

[0064] 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.

[0065] This facilitates the implementation of the welding process and reduces the impact on the electrical connector 20 or pole 112 during the welding process.

[0066] In some other embodiments of this application, the surface roughness of the first snap-fit ​​surface 1123 and the second snap-fit ​​surface 221 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.

[0067] In this way, the two mating surfaces have sufficient roughness to allow the gases generated during welding to escape.

[0068] Understandably, the first snap-fit ​​surface 1123 and the second snap-fit ​​surface 221 can be formed by machining, or by chemical or electrochemical treatment.

[0069] In other embodiments of this application, reference is made to Figure 1 and Figure 2 The electrode 112 includes a first electrode 1124 and a second electrode 1125; the first electrode 1124 and the second electrode 1125 are both disposed on the same end face of the single cell 10 and are spaced apart in the length direction of the end face; one of the first electrode 1124 and the second electrode 1125 is a positive electrode 112 and the other is a negative electrode 112.

[0070] In this way, multiple individual battery cells 10 can be arranged horizontally with the end face of the terminal 112 facing upwards. If parallel connection is required, the two ends of the electrical connector 20 are respectively connected to the terminal 112 of the same polarity of different individual battery cells 10; if series connection is required, the two ends of the electrical connector 20 are respectively connected to the terminal 112 of different polarities of different individual battery cells 10. Compared to the case where the positive and negative terminal 112 are not on the same end face, or the case where the positive and negative terminal 112 are on the same end face, the connection of the electrical connector 20 is more convenient.

[0071] In other embodiments of this application, the first snap-fit ​​structures of the first pole post 1124 and the second pole post 1125 have the same shape and size, and are respectively connected to different electrical connectors 20. Both ends of the electrical connectors 20 are provided with second snap-fit ​​structures of the same shape and size.

[0072] This results in lower processing costs and easier battery assembly.

[0073] Specifically, refer to Figure 5 The pole post 112 includes a connecting plate 1121 and a post 1122, wherein the post 1122 is used to electrically connect to the electrical connector 20, and the connecting plate 1121 is used to electrically connect to the battery cell.

[0074] Specifically, refer to Figure 6 , Figure 9 or Figure 12 The electrical connector 20 includes a body 21 and an electrical connection portion 22. More specifically, two electrical connection portions 22 may be provided, one at each end of the body 21. The two electrical connection portions 22 are respectively connected to two adjacent single battery cells.

[0075] This application embodiment also provides an electrical device, including the aforementioned single battery 10. Multiple single batteries 10 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 portable devices like mobile phones and laptops, or vehicles like electric vehicles, electric cars, ships, airplanes, and spacecraft, as well as electric toys, power tools, and various household appliances. Spacecraft include rockets, space shuttles, and spacecraft.

[0076] The electrical equipment of this application embodiment has a first snap-fit ​​structure on the pole 112 that is electrically connected to the electrical connector 20, and a second snap-fit ​​structure on the electrical connector 20 that cooperates with the first snap-fit ​​structure, so that the first snap-fit ​​structure and the second snap-fit ​​structure form a snap-fit ​​gap, which allows butt welding to be performed within the snap-fit ​​gap, reducing welding power, facilitating the discharge of gas generated by laser welding, reducing the possibility of bursting, and increasing the electrical connection performance and electrical connection stability between the electrical connector 20 and the pole 112.

[0077] 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, characterized in that, The battery includes: A single battery cell includes an electrode post located at one end of the single battery cell; the surface of the electrode post is provided with a first snap-fit ​​structure, the first snap-fit ​​structure including a first snap-fit ​​mating surface extending along a first direction; An electrical connector is configured to electrically connect two adjacent individual battery cells; the electrical connector 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 ​​surface extending along a 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 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 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 rectangular 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 comb-shaped grooves, and the sidewalls of the rectangular protrusions or rectangular grooves are the second snap-fit ​​mating surfaces.

4. The battery 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 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 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 according to claim 1, characterized in that, The electrode post includes a first electrode post and a second electrode post; the first electrode post and the second electrode post are both disposed on the same end face of the single cell and are spaced apart in the length direction of the end face; one of the first electrode post and the second electrode post is a positive electrode post and the other is a negative electrode post.

8. The battery according to claim 7, characterized in that, The first and second poles have the same shape and size in their first snap-fit ​​structures, and are respectively connected to different electrical connectors.

9. The battery according to claim 1, characterized in that, Both ends of the electrical connector are provided with a second snap-fit ​​structure of the same shape and size.

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

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