Pole, top cover assembly, battery monomer and power utilization device

Abstract

The utility model relates to a pole post, a top cover assembly, a battery monomer and an electric device, the pole post comprises an inner connecting part and an outer connecting part, one of the inner connecting part and the outer connecting part is provided with a plug-in groove, the other one of the inner connecting part and the outer connecting part is provided with a plug-in bulge, and the periphery of the plug-in bulge is provided with plug-in teeth; the inserting protrusions are connected with the inserting grooves in an inserted mode, and the inserting protrusions are in interference fit with the side walls of the inserting grooves through the inserting teeth so as to extrude the side walls of the inserting grooves to enable the inserting grooves to deform. Compared with the mode that the two connecting parts are connected through welding, the outer connecting part and the inner connecting part are connected in a pressing rivet mode, and the machining cost is reduced. The inserting protrusions are in interference fit with the side walls of the inserting grooves through the inserting teeth on the peripheries, the contact area of the inserting protrusions and the side walls of the inserting grooves can be reduced through the arrangement of the inserting teeth, the pressure intensity of the contact positions of the inserting protrusions and the side walls of the inserting grooves is increased, the side walls of the inserting grooves are easier to deform, and the service life of the inserting grooves is prolonged. Therefore, the connection between the outer connecting part and the inner connecting part is more reliable.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to an electrode post, a top cover assembly, a battery cell, and an electrical device. Background Technology

[0002] With the rapid expansion and development of the new energy market, the market share of new energy vehicles is gradually increasing. As a result, the application of power batteries, the core component of new energy vehicles, is becoming increasingly widespread in people's lives.

[0003] A power battery consists of a casing and individual battery cells. The battery cells are installed within the casing and have terminals (or posts) that connect them electrically. Generally, the inner connection portion of the terminals, used for electrical connection to the internal battery cells, and the outer connection portion, used for electrical connection to external structures, are made of dissimilar metals and are typically connected and fixed using friction welding. However, this connection method not only has high processing costs but is also prone to incomplete soldering, affecting the battery's safety performance. Utility Model Content

[0004] Therefore, it is necessary to provide a terminal post, top cover assembly, battery cell, and power supply device that can improve the above-mentioned problems.

[0005] On the one hand, this application provides an electrode post, including an inner connecting part and an outer connecting part, one of the inner connecting part and the outer connecting part is provided with a insertion groove, and the other is provided with an insertion protrusion, and the outer periphery of the insertion protrusion is provided with insertion teeth;

[0006] The insertion protrusion is inserted into the insertion groove, and the insertion protrusion is pressurized against the side wall of the insertion groove by the insertion teeth to deform the side wall of the insertion groove.

[0007] In one embodiment, the insertion teeth are arranged around the insertion protrusion;

[0008] and / or

[0009] The insertion teeth are evenly spaced in the circumferential direction surrounding the insertion protrusion.

[0010] In one embodiment, the insertion protrusion includes an interlocking section and a pressing section connected to each other, and the insertion teeth are arranged around the pressing section;

[0011] When the insertion protrusion is inserted into the insertion groove, the snap-in section is closer to the bottom wall of the insertion groove relative to the push-in section;

[0012] Wherein, the outer contour of the insertion tooth is larger than the outer contour of the snap-in section, the snap-in section is clearance-fitted with the sidewall of the insertion groove, and the press-in section is interference-fitted with the sidewall of the insertion groove through the insertion tooth.

[0013] In one embodiment, the cross-sectional area of ​​the snap-in segment gradually increases from the end near the push-in segment to the end away from the push-in segment;

[0014] When the insertion protrusion is inserted into the insertion groove, a receiving gap is formed between the snap-in section and the side wall of the insertion groove. The receiving gap is configured to accommodate the portion of the insertion groove that overflows when it is squeezed by the insertion teeth.

[0015] In one embodiment, the height of the insertion protrusion is equal to the depth of the insertion groove;

[0016] When the insertion protrusion is inserted into the insertion groove, the insertion protrusion abuts against the bottom wall of the insertion groove.

[0017] In one embodiment, the insertion groove is provided on the inner connecting portion, and the insertion protrusion is provided on the outer connecting portion;

[0018] The external connecting part includes a flat part and a plug-in part that are connected to each other. The plug-in protrusion is provided at the end of the flat part away from the plug-in part. The plug-in part is used to plug into an external structure.

[0019] When the insertion protrusion is inserted into the insertion groove, the flat part abuts against the inner connecting part.

[0020] In one embodiment, the outer connecting portion includes the insertion protrusion, and the inner connecting portion includes the insertion groove; the hardness of the outer connecting portion is greater than the hardness of the inner connecting portion;

[0021] and / or

[0022] The outer connecting part includes the insertion protrusion, and the inner connecting part includes the insertion groove; the inner connecting part is made of 1060 aluminum, and the outer connecting part is made of aluminum alloy or copper.

[0023] On the other hand, this application also provides a top cover assembly, including:

[0024] Top cover;

[0025] Injection molding section;

[0026] As described above, poles;

[0027] The top cover is provided with an assembly hole, the inner connecting part of the pole is located in the assembly hole, the injection molding part is located between the inner connecting part and the top cover, and the outer connecting part of the pole is connected to the inner connecting part through an insertion protrusion and an insertion groove.

[0028] In another aspect, this application also provides a battery cell, including the terminal post as described above, or the top cover assembly as described above.

[0029] In another aspect, this application also provides an electrical device, including a battery cell as described above.

[0030] Compared with the prior art, this application has the following beneficial effects:

[0031] This application provides a terminal post in which, when an external force is applied to insert a protrusion into a recess, the protrusion, through an interference fit with the recess via insertion teeth, deforms the sidewall of the recess under the pressure of the insertion teeth. This deformation fixes the insertion teeth of the protrusion into the recess, effectively achieving a fixed connection between the protrusion and the sidewall of the recess through riveting, thus achieving a fixed connection between the inner and outer connecting parts. Compared to the existing technology that connects the two connecting parts by welding, the connection of the outer and inner connecting parts by riveting not only reduces processing costs but also eliminates the problem of incomplete soldering that is prone to occur during welding, thereby improving the safety performance of the battery. Furthermore, the insertion protrusion is interference-fitted with the side wall of the insertion groove through the insertion teeth on its outer periphery. The insertion teeth help to reduce the contact area between the insertion protrusion and the side wall of the insertion groove, increase the pressure at the contact point between the insertion protrusion and the side wall of the insertion groove, and make the side wall of the insertion groove more easily deformable, thereby ensuring a more reliable connection between the outer and inner connecting parts. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 An exploded view of the pole provided in a preferred embodiment of this application;

[0034] Figure 2 for Figure 1 A structural diagram of the outer connection part of the pole post shown in the figure;

[0035] Figure 3 for Figure 1 A cross-sectional view showing the connection between the inner and outer connecting parts of the pole shown.

[0036] Figure 4 for Figure 3 Another cross-sectional view of the pole shown;

[0037] Figure 5 for Figure 4 Enlarged view of point A of the pole shown in the figure ( Figure 5 The light blue lines represent the connector teeth, from Figure 5 It can be seen that the protruding teeth are inserted into the side wall of the protrusion groove.

[0038] Figure 6 for Figure 2 Another structural diagram of the external connecting part shown in the figure;

[0039] Figure 7 An exploded view of a top cover assembly provided in a preferred embodiment of this application;

[0040] Figure 8 for Figure 7 Another exploded view of the top cover assembly shown;

[0041] Figure 9 for Figure 7 Assembly diagram of the top cover assembly shown;

[0042] Figure 10 An exploded view of a battery cell provided in a preferred embodiment of this application;

[0043] Figure 11 for Figure 10 The assembly diagram of the battery cell shown is shown.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1000, Battery cell; 100, Top cover assembly; 10, Terminal post; 11, Inner connection part; 12, Outer connection part; 121, Flat part; 122, Insertion part; 13, Insertion groove; 14, Insertion protrusion; 141, Insertion tooth; 142, Snap-in section; 143, Press-in section; 15, Accommodation gap; 20, Top cover; 21, Assembly hole; 30, Injection molding part; 200, Housing; 300, Battery cell. Detailed Implementation

[0046] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0047] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0048] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0049] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0050] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0051] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0052] See Figure 1 One embodiment of this application provides a terminal post 10, including an inner connecting portion 11 and an outer connecting portion 12. The inner connecting portion 11 is used for electrical connection with the cell 300 of the battery cell 1000, and the outer connecting portion 12 is used for electrical connection with an external structure. The outer connecting portion 12 and the inner connecting portion 11 are connected (including mechanical connection and electrical connection).

[0053] One of the inner connecting portion 11 and the outer connecting portion 12 is provided with a insertion groove 13, and the other is provided with a insertion protrusion 14, which is inserted into the insertion groove 13. Further, see [reference needed]. Figures 2-5 The outer periphery of the insertion protrusion 14 is provided with insertion teeth 141. The insertion protrusion 14 is pressurized with the side wall of the insertion groove 13 by the insertion teeth 141 to deform the side wall of the insertion groove 13, so as to realize the connection between the inner connecting part 11 and the outer connecting part 12.

[0054] Optionally, the surface hardness of the insertion tooth 141 is greater than the hardness of the sidewall of the insertion groove 13, so as to compress the sidewall of the insertion groove 13 and deform it.

[0055] The electrode post 10 provided in this application embodiment, when an external force is applied to insert the insertion protrusion 14 into the insertion groove 13, causes the sidewall of the insertion groove 13 to deform under the squeezing action of the insertion teeth 141 due to the interference fit between the insertion protrusion 14 and the insertion groove 13. This deformation fixes the insertion teeth 141 of the insertion protrusion 14 in the insertion groove 13, which is equivalent to achieving a fixed connection between the insertion protrusion 14 and the sidewall of the insertion groove 13 by riveting, thus achieving a fixed connection between the inner connecting part 12 and the outer connecting part 13. Compared with the prior art method of connecting the two connecting parts by welding, the connection of the outer connecting part 12 and the inner connecting part 11 by riveting not only reduces the processing cost but also eliminates the problem of poor welding caused by welding, thereby improving the safety performance of the battery. Furthermore, the insertion protrusion 14 is interference-fitted with the side wall of the insertion groove 13 through the insertion teeth 141 on its outer periphery. The insertion teeth 141 help to reduce the contact area between the insertion protrusion 14 and the side wall of the insertion groove 13, increase the pressure at the contact position between the insertion protrusion 14 and the side wall of the insertion groove 13, and make the side wall of the insertion groove 13 more easily deformable, thereby ensuring a more reliable connection between the outer connecting part 12 and the inner connecting part 11.

[0056] It should be noted that the inner connecting part 12 and the outer connecting part 13 are usually made of different materials, which results in different hardnesses between them. This makes the sidewalls of the insertion protrusion 14 and the insertion groove 13 have different hardnesses, so that when the insertion protrusion 14 is inserted into the insertion groove 13, the sidewalls of the insertion groove 13 can deform.

[0057] In some embodiments, the inner connecting portion 11 includes a insertion groove 13, and the outer connecting portion 12 includes an insertion protrusion 14. During the manufacture of the top cover assembly 100 forming the battery cell 1000, the inner connecting portion 11 is connected to the top cover 20 as a whole, and then the outer connecting portion 12 is connected to the aforementioned whole. Thus, by providing the insertion protrusion 14 on the outer connecting portion 12 and the insertion groove 13 on the inner connecting portion 11, when external pressure is applied to the outer connecting portion 12, it is convenient to insert the insertion protrusion 14 into the insertion groove 13, thereby achieving the connection between the outer connecting portion 12 and the inner connecting portion 11.

[0058] Furthermore, the hardness of the outer connecting part 12 is greater than that of the inner connecting part 11, meaning that the hardness of the material used for the outer connecting part 12 is greater than that of the material used for the inner connecting part 11. When an external force is applied to the outer connecting part 12 to insert the insertion protrusion 14 into the insertion groove 13, because the hardness of the outer connecting part 12 is greater, meaning that the hardness of the insertion tooth 141 is greater than the hardness of the side wall of the insertion groove 13, the side wall of the insertion groove 13 is more easily deformed, thereby achieving a firm connection between the insertion protrusion 14 and the side wall of the insertion groove 13, and thus achieving a firm fixation between the outer connecting part 12 and the inner connecting part 11.

[0059] Optionally, the inner connecting part 11 is made of 1060 aluminum, and the outer connecting part 12 is made of aluminum alloy or copper. For example, the outer connecting part 12 can be made of T1 copper, T2 copper or T3 copper, so that the hardness of the outer connecting part 12 is greater than that of the inner connecting part 11, and at the same time, the outer connecting part 12 has good electrical properties.

[0060] Of course, in other embodiments, the materials used for the outer connecting portion 12 and the inner connecting portion 11 are not limited. For example, the outer connecting portion 12 can also be made of the same material as the inner connecting portion 11, such as using 1060 aluminum. In this case, the outer connecting portion 12 can be heat-treated to increase the surface hardness of the material, or it can be plated with nickel or chromium to increase the surface hardness. Afterwards, the material surface can be plated with nickel again to improve the current carrying capacity. By increasing the surface hardness of the material, the hardness of the surface of the insertion tooth 141 is greater than the hardness of the sidewall of the insertion groove 13, causing the sidewall of the insertion groove 13 to deform.

[0061] Continue reading Figure 2 The outer connecting portion 12 also includes a flat portion 121 and a plug-in portion 122 connected to each other. A plug-in protrusion 14 is provided at the end of the flat portion 121 away from the plug-in portion 122. The plug-in portion 122 is used for plugging into an external structure. There can be one or more plug-in portions 122, which is not limited here. When the plug-in protrusion 14 is inserted into the plug-in groove 13, the flat portion 121 abuts against the inner connecting portion 11. The flat portion 121 serves to limit the outer connecting portion 12, preventing the plug-in protrusion 14 from being inserted too deeply into the plug-in groove 13, which could damage the inner connecting portion 11 or the outer connecting portion 12.

[0062] For details, please refer to [link / reference]. Figure 4 The height of the insertion protrusion 14 is equal to the depth of the insertion groove 13. When the insertion protrusion 14 is inserted into the insertion groove 13, it abuts against the bottom wall of the insertion groove 13. Thus, when the outer connecting part 12 and the inner connecting part 11 are connected by insertion, the insertion protrusion 14 is precisely inserted into the insertion groove 13, avoiding any part of the insertion protrusion 14 protruding from the insertion groove 13 or any gap between the insertion protrusion 14 and the bottom wall of the insertion groove 13. This increases the contact area between the insertion protrusion 14 and the groove wall of the insertion groove 13, ensuring the stability of the connection between the outer connecting part 12 and the inner connecting part 11.

[0063] In some embodiments, see further reference. Figure 4 and Figure 5The insertion protrusion 14 includes a snap-in section 142 and a press-in section 143 connected to each other, with insertion teeth 141 surrounding the press-in section 143. When the insertion protrusion 14 is inserted into the insertion groove 13, the snap-in section 142 is closer to the bottom wall of the insertion groove 13 relative to the press-in section 143. The outer contour of the insertion teeth 141 is larger than the outer contour of the snap-in section 142. The snap-in section 142 has a clearance fit with the side wall of the insertion groove 13, and the press-in section 143 has an interference fit with the side wall of the insertion groove 13 through the insertion teeth 141. If the cross-sectional area of ​​the insertion groove 13 is defined as S1, the cross-sectional areas of the insertion teeth 141 and the press-in section 143 are defined as S2, and the cross-sectional area of ​​the snap-in section 142 is defined as S3, then S2 > S1 > S3.

[0064] With the above configuration, since S3 is less than S1, it is convenient to guide the insertion protrusion 14 through the snap-in section 142 into the insertion groove 13. Since S2 is greater than S1, after the insertion protrusion 14 is inserted into the insertion groove 13, the insertion tooth 141 is interference-fitted with the side wall of the insertion groove 13, which facilitates the deformation of the side wall of the insertion groove 13, making the connection between the insertion tooth 141 and the side wall of the insertion groove 13 firm, thereby ensuring a more reliable connection between the outer connecting part 12 and the inner connecting part 11.

[0065] Further reading Figure 5 The cross-sectional area of ​​the snap-in section 142 gradually increases from the end near the pressing section 143 to the end away from the pressing section 143. When the insertion protrusion 14 is inserted into the insertion groove 13, a receiving gap 15 is formed between the snap-in section 142 and the side wall of the insertion groove 13. The receiving gap 15 is configured to receive the portion of the side wall of the insertion groove 13 that overflows due to being squeezed by the insertion teeth 141.

[0066] The aforementioned receiving gap 15 is formed by the snap-in section 142 and the sidewall of the insertion groove 13. Since the cross-sectional area of ​​the snap-in section 142 gradually increases from the end near the pressing section 143 to the end away from the pressing section 143, the cross-sectional area of ​​the receiving gap 15 is an inverted trapezoidal structure. The insertion tooth 141 and the sidewall of the insertion groove 13 are interference-fitted. At the interference-fitted part, the insertion tooth 141 squeezes the sidewall of the insertion groove 13, and the squeezed-out part is received into the receiving gap 15. Because the receiving gap 15 is an inverted trapezoidal structure, when the squeezed-out part fills the receiving gap 15, the filling material can restrict the snap-in section 142 from coming out of the insertion groove 13, thus forming a reliable fixing structure, which further fixes the outer connecting part 12 and the inner connecting part 11.

[0067] Optionally, please continue reading Figure 2 , Figure 5 And see Figure 6The insertion teeth 141 are arranged around the pressing section 143, so that the insertion teeth 141 are interference fit with the side wall of the insertion groove 13, which increases the fixing firmness.

[0068] Furthermore, the insertion teeth 141 are evenly spaced in the circumferential direction surrounding the pressing section 143. In this way, when the insertion protrusion 14 is inserted into the insertion groove 13, the insertion teeth 141 at each location are subjected to uniform force, ensuring the connection effect between the insertion teeth 141 and the side wall of the insertion groove 13.

[0069] It should be understood that in some other embodiments, insertion teeth 141 may be provided in a local part of the pressing section 143, and the insertion teeth 141 may also be provided in a non-uniformly distributed manner in the pressing section 143, which is not limited here.

[0070] See Figures 7-9 Another embodiment of this application provides a top cover assembly 100, which includes a top cover 20, an injection-molded portion 30, and the aforementioned pole post 10. The top cover 20 has a mounting hole 21, the inner connecting portion 11 of the pole post 10 is disposed within the mounting hole 21, the injection-molded portion 30 is disposed between the inner connecting portion 11 and the top cover 20, and the outer connecting portion 12 of the pole post 10 is inserted into the inner connecting portion 11 via an insertion protrusion 14 and an insertion groove 13. Specifically, the inner connecting portion 11, the injection-molded portion 30, and the top cover 20 are joined together by injection molding, preferably by nano-injection molding, and then the outer connecting portion 12 is pressed together with the inner connecting portion 11 by a cold pressing process.

[0071] It should be noted that the injection molding part 30 is an insulating part, and the injection molding part 30 is located between the inner connecting part 11 and the top cover 20 to achieve insulation between the inner connecting part 11 and the top cover 20.

[0072] See Figure 10 and Figure 11 Another embodiment of this application also provides a battery cell 1000, which includes the top cover assembly 100 described above, or the battery cell 1000 includes the terminal post 10 described above.

[0073] Furthermore, the battery cell 1000 also includes a housing 200 and a battery cell 300. One end of the housing 200 has an opening, and the battery cell 300 is installed inside the housing 200 through the opening. The top cover assembly 100 is connected to the housing 200 to close the opening of the housing 200. The inner connection portion 11 of the terminal post 10 is electrically connected to the tab of the battery cell 300.

[0074] Another embodiment of this application provides an electrical device including the aforementioned battery cell 1000.

[0075] Optionally, the electrical device is a vehicle, which can be a gasoline vehicle, a natural gas vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended vehicles, etc.

[0076] It is worth noting that, for pure electric vehicles, the aforementioned batteries can serve as a driving power source, thereby replacing fossil fuels to provide driving power.

[0077] In other embodiments, the type of electrical device is not limited. For example, the electrical device can also be a ship, spacecraft, electric toy, power tool, energy storage device, amusement equipment, elevator, and lifting equipment, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, or electric airplane toys, etc.; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices can be energy storage walls, base station energy storage, container energy storage, etc.; amusement equipment can be a carousel, a drop tower, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0078] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electrode post, characterized in that, It includes an inner connecting part (11) and an outer connecting part (12). One of the inner connecting part (11) and the outer connecting part (12) is provided with a plug-in groove (13), and the other is provided with a plug-in protrusion (14). The outer periphery of the plug-in protrusion (14) is provided with plug-in teeth (141). The insertion protrusion (14) is inserted into the insertion groove (13), and the insertion protrusion (14) is pressurized against the side wall of the insertion groove (13) by the insertion teeth (141) to deform the side wall of the insertion groove (13).

2. The pole post according to claim 1, characterized in that, The insertion teeth (141) are arranged around the insertion protrusion (14); and / or The insertion teeth (141) are evenly spaced in the circumferential direction surrounding the insertion protrusion (14).

3. The pole piece according to claim 1, characterized in that, The insertion protrusion (14) includes a snap-in section (142) and a press-in section (143) connected to each other, and the insertion teeth (141) are arranged around the press-in section (143); When the insertion protrusion (14) is inserted into the insertion groove (13), the snap-in section (142) is closer to the bottom wall of the insertion groove (13) relative to the push-in section (143); Wherein, the outer contour of the insertion tooth (141) is larger than the outer contour of the snap-in section (142), the snap-in section (142) is clearance-fitted with the side wall of the insertion groove (13), and the press-in section (143) is interference-fitted with the side wall of the insertion groove (13) through the insertion tooth (141).

4. The pole post according to claim 3, characterized in that, The cross-sectional area of ​​the insert section (142) gradually increases from the end near the press-in section (143) to the end away from the press-in section (143); When the insertion protrusion (14) is inserted into the insertion groove (13), a receiving gap (15) is formed between the snap-in section (142) and the side wall of the insertion groove (13). The receiving gap (15) is configured to receive the portion of the side wall of the insertion groove (13) that overflows when it is squeezed by the insertion teeth (141).

5. The pole post according to claim 1, characterized in that, The height of the insertion protrusion (14) is equal to the depth of the insertion groove (13); When the insertion protrusion (14) is inserted into the insertion groove (13), the insertion protrusion (14) abuts against the bottom wall of the insertion groove (13).

6. The pole post according to claim 1, characterized in that, The insertion groove (13) is provided on the inner connecting part (11), and the insertion protrusion (14) is provided on the outer connecting part (12); The external connecting part (12) includes a flat part (121) and a plug-in part (122) connected to each other. The plug-in protrusion (14) is provided at the end of the flat part (121) away from the plug-in part (122). The plug-in part (122) is used to plug into an external structure. When the insertion protrusion (14) is inserted into the insertion groove (13), the flat part (121) abuts against the inner connecting part (11).

7. The pole post according to claim 1, characterized in that, The outer connecting part (12) includes the insertion protrusion (14), and the inner connecting part (11) includes the insertion groove (13); the hardness of the outer connecting part (12) is greater than the hardness of the inner connecting part (11); and / or The outer connecting part (12) includes the insertion protrusion (14), and the inner connecting part (11) includes the insertion groove (13); the inner connecting part (11) is made of 1060 aluminum material, and the outer connecting part (12) is made of aluminum alloy or copper.

8. A top cover assembly, characterized in that, include: Top cover (20); Injection molding section (30); The pole post as described in any one of claims 1-7; The top cover (20) is provided with an assembly hole (21), the inner connecting part (11) of the pole is provided in the assembly hole (21), the injection molding part (30) is provided between the inner connecting part (11) and the top cover (20), and the outer connecting part (12) of the pole is connected to the inner connecting part (11) through the insertion protrusion (14) and the insertion groove (13).

9. A single battery cell, characterized in that, Includes the pole as described in any one of claims 1-7, or the top cover assembly as described in claim 8.

10. An electrical appliance, characterized in that, Includes the battery cell as described in claim 9.

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