Housing assembly, secondary battery and electronic device

Abstract

The utility model provides a shell assembly, a secondary battery and an electronic device. The shell assembly comprises a shell, a pole and a sealing nail, the shell comprises an end wall; the pole penetrates through the end wall and is provided with a first end face, the first end face is provided with a counter bore, the counter bore comprises a first hole section and a second hole section which are continuously arranged, the first hole section is connected to the first end face, the second hole section is connected to the end, away from the first end face, of the first hole section, and the projection of the second hole section is in the projection of the first hole section; the sealing nail blocks the countersunk table hole and comprises a first table part and a second table part, the first table part is at least partially contained in the first hole section, the second table part is at least partially contained in the second hole section, a frustum-shaped matching surface is formed between the second table part and the second hole section, and the small end of the frustum-shaped matching surface is far away from the first table part; and the height of the second platform part is greater than the depth of the first hole section along the penetrating direction of the pole, so that the technical problem of low assembly efficiency of the sealing nail and the pole can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a shell component, a secondary battery and an electronic device. Background Art

[0002] With the development of new energy technology, secondary batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric airplanes, electric ships, electric toy cars, etc.

[0003] In the current mainstream secondary batteries, the shell assembly is an important component, and the positive terminal pole and the sealing pin are sealed and fixed by welding. The smaller the fitting tolerance between the sealing pin and the pole, the more conducive it is to the firmness and reliability of the welding of the sealing pin and the pole. However, a smaller fitting tolerance will cause a high probability of interference when the sealing pin is placed in the matching hole of the pole, resulting in reduced assembly efficiency. Utility Model Content

[0004] In view of the above shortcomings of the prior art, the utility model provides a housing assembly, a secondary battery and an electronic device to improve the technical problem of low assembly efficiency of sealing nails and poles.

[0005] To achieve the above-mentioned purpose and other related purposes, the utility model provides a shell assembly, a secondary battery and an electronic device, the shell assembly comprising: a shell, a pole and a sealing nail; the shell comprises an end wall; the pole is installed through the end wall, the pole has a first end face located outside the shell, the first end face is provided with a countersunk hole recessed toward one side of the shell, the countersunk hole comprises a first hole section and a second hole section arranged continuously, the first hole section is connected to the first end face, the second hole section is connected to an end of the first hole section away from the first end face, along the direction in which the pole passes through, the projection of the second hole section is within the projection of the first hole section; the sealing nail blocks the countersunk hole, the sealing nail comprises a first platform portion and a second platform portion, the first platform portion is at least partially accommodated in the first hole section, the second platform portion is at least partially accommodated in the second hole section, a frustum-shaped mating surface is formed between the second platform portion and the second hole section, and the small end of the frustum-shaped mating surface is away from the first platform portion; wherein, along the direction in which the pole passes through, the height of the second platform portion is greater than the depth of the first hole section.

[0006] In the above technical solution, a frustoconical mating surface is formed between the second platform and the second hole segment, and the small end of the frustoconical mating surface is away from the first platform. When the second platform of the sealing nail enters the second hole segment of the countersunk hole, the small end of the second platform enters the large end of the second hole segment first, which has the effect of facilitating entry, and the setting of the frustoconical mating surface plays a guiding and positioning role for the installation of the sealing nail. In addition, the height of the second platform is greater than the depth of the first hole segment, so that the second platform has begun to enter the second hole segment before the first platform enters the first hole segment, so as to pre-guide the sealing nail, thereby reducing the probability of interference between the first platform and the first end face of the pole.

[0007] In an example of a shell assembly of the present invention, the first hole section includes a first bottom wall surrounding and connected to the second hole section and a first inner side surface surrounding and connected to the first bottom wall, the first inner side surface is connected to the first end surface away from one end of the first bottom wall, the second hole section includes a second inner side surface connected to the first bottom wall, the first platform includes a first bottom surface surrounding and connected to the second platform and a first outer side surface surrounding and connected to the first bottom surface, the second platform includes a second bottom surface away from the first platform and a second outer side surface surrounding and connected to the second bottom surface, along the radial direction of the end wall, the distance between the intersection line of the first inner side surface and the first end surface and the intersection line of the first bottom wall and the second inner side surface is a, and the distance between the outer edge of the first bottom surface and the outer edge of the second bottom surface is b, wherein a>b.

[0008] In the above technical solution, by setting a>b, it can be achieved that even when the second platform deviates from the center and reaches the limit state of connecting with the inner edge of the first bottom wall, the outer edge of the first bottom surface can also enter the first hole section, so as to reduce the risk of interference between the first platform and the first end face, reduce the positioning difficulty, and enable the sealing nail to enter even when the positioning error is large, thereby improving the assembly efficiency.

[0009] In an example of the housing assembly of the present invention, an outer edge of the first bottom surface is provided with a bevel and / or a rounded corner.

[0010] In the above technical solution, the problem of interference between the first platform and the first end face during the assembly process can be improved, and the sealing nail can be guided during the assembly process, further reducing the positioning difficulty. Even when the positioning error is large, the sealing nail can still enter, thereby improving the assembly efficiency.

[0011] In an example of the housing assembly of the present invention, the first inner side surface includes a first straight wall parallel to the direction in which the pole penetrates, and the first outer side surface includes a second straight wall parallel to the direction in which the pole penetrates.

[0012] In the above technical solution, the first inner side surface and the first outer side surface are welding surfaces, and the first straight wall and the second straight wall are arranged to be parallel to the direction in which the pole penetrates. The arrangement of the first straight wall and the second straight wall allows for a larger processing window during the welding process, and the width of the weld mark formed on the welding surface in the radial direction of the end wall is smaller, so as to achieve a full welding effect on the welding surface, thereby obtaining more reliable welding quality, while also ensuring that the welding appearance meets the requirements.

[0013] In an example of the housing assembly of the utility model, the outer edge of the first bottom surface is provided with a first bevel, and the length of the first bevel along the direction of the pole penetration is d, wherein d is less than or equal to 40% of the depth of the first hole section.

[0014] In the above technical solution, the setting of the first bevel angle can improve the problem of interference between the first platform and the first end face; setting d to be less than or equal to 40% of the depth of the first hole section ensures that the second straight wall has sufficient thickness to be welded and fixed to the first straight wall to achieve more stable welding quality.

[0015] In an example of the housing assembly of the present invention, the length of the first oblique angle along the direction perpendicular to the pole penetration direction is e, wherein d≤e.

[0016] In the above technical solution, the setting of d≤e is more conducive to guiding the sealing nail, so as to further reduce the difficulty of positioning. Even when the positioning error is large, the sealing nail can still enter, thereby improving the assembly efficiency.

[0017] In one example of the housing assembly of the present invention, the first hole segment includes a cylindrical hole segment, the first platform includes a cylindrical segment matching the cylindrical hole segment, and the difference between the radius of the cylindrical hole segment and the radius of the cylindrical segment is f, f≤0.2mm.

[0018] In the above technical solution, setting f within this range is not only beneficial to the assembly of the first hole section and the first platform, but also can reduce the gap, facilitate welding filling, and help achieve higher welding quality.

[0019] In one example of the shell assembly of the utility model, along the radial direction of the end wall, in the same plane, the distance from the second inner side surface to the axis of the countersunk hole is x, and the distance from the second outer side surface to the axis of the sealing pin is y, and the minimum value of xy is g, where g>f.

[0020] In the above technical solution, g>f is set, which is convenient for guiding on the one hand, and also reduces the gap on the other hand, which is convenient for welding filling and conducive to achieving higher welding quality.

[0021] In an example of the housing assembly of the present invention, a first fillet is provided at the junction of the first inner side surface and the first end surface, and the radius of the first fillet is less than 0.2 mm.

[0022] In the above technical solution, the first fillet can guide the sealing pin during the assembly process to improve assembly efficiency. Setting the radius of the first fillet to less than 0.2 mm can provide more molten raw materials for welding to improve welding quality.

[0023] The utility model also provides a secondary battery, which includes a shell assembly of any one of the above items, and the secondary battery also includes an electrode assembly accommodated in the shell, the electrode assembly is electrically connected to the pole, the sealing nail seals the countersunk hole, and the edge of the first platform and the edge of the first hole section are connected by welding.

[0024] The shell component of the battery pack forms a frustum-shaped mating surface between the second platform and the second hole segment, and the small end of the frustum-shaped mating surface is away from the first platform. When the second platform of the sealing nail enters the second hole segment of the countersunk hole, the small end of the second platform enters the large end of the second hole segment first, which has the effect of facilitating entry, and the setting of the frustum-shaped mating surface plays a guiding and positioning role in the installation of the sealing nail. In addition, the height of the second platform is greater than the depth of the first hole segment, so that the second platform has begun to enter the second hole segment before the first platform enters the first hole segment, so as to pre-guide the sealing nail, thereby reducing the probability of interference between the first platform and the first end face of the pole.

[0025] The utility model also provides an electronic device, which comprises any one of the above-mentioned secondary batteries.

[0026] In the shell component of the utility model, the second platform and the second hole segment form a frustum-shaped mating surface, and the small end of the frustum-shaped mating surface is far away from the first platform. In this technical solution, when the second platform of the sealing nail enters the second hole segment of the countersunk hole, the small end of the second platform enters the large end of the second hole segment first, which has the effect of facilitating entry, and the setting of the frustum-shaped mating surface plays a guiding and positioning role for the installation of the sealing nail. In addition, the height of the second platform is greater than the depth of the first hole segment, so that the second platform has begun to enter the second hole segment before the first platform enters the first hole segment, so as to pre-guide the sealing nail, thereby reducing the probability of interference between the first platform and the first end face of the pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other embodiments can be obtained based on these drawings without paying creative work.

[0028] Figure 1 This is a schematic structural diagram of an example of a housing assembly of the utility model;

[0029] Figure 2 for Figure 1 A partial enlarged view of the middle A;

[0030] Figure 3 This is a structural schematic diagram of a housing assembly in an example of the utility model when the sealing nail is in an extreme state during installation;

[0031] Figure 4 A cross-sectional view of a pole in an example of a housing assembly of the utility model;

[0032] Figure 5 This is a schematic diagram of the structure of the pole in an example of the housing assembly of the utility model;

[0033] Figure 6 A cross-sectional view of a sealing pin in an example of a housing assembly of the utility model;

[0034] Figure 7 This is a schematic diagram of the structure of a sealing pin in an example of a housing assembly of the utility model;

[0035] Figure 8 This is a structural schematic diagram of another example of the housing assembly of the utility model when the sealing nail is in an extreme state during installation;

[0036] Fig. 9 A cross-sectional view of a sealing pin in another example of a housing assembly of the present invention;

[0037] Fig.10 This is a schematic diagram of the structure of a sealing pin in another example of a housing assembly of the utility model;

[0038] Fig.11 This is a schematic structural diagram of an example of a secondary battery of the utility model;

[0039] Fig.12 This is a schematic diagram of the structure of an electrode assembly of an example of a secondary battery of the utility model;

[0040] Fig.13 A schematic diagram of an example of a battery pack of the utility model;

[0041] Fig.14 It is a schematic diagram of an example of the electronic device of the present invention.

[0042] Component number description

[0043] 1. Electronic device; 10. Battery pack; 11. Working part; 101. Box; 102. Box cover; 100. Secondary battery; 110. Shell; 111. End wall; 112. Side wall; 113. Opening; 120. Electrode assembly; 121. Positive electrode sheet; 1211. Positive electrode current collector; 1212. First coating area; 1213. First uncoated area; 122. Separator; 123. Negative electrode sheet; 1231. Negative electrode current collector; 1232. Second coating area; 1233. Second uncoated area; 124. Negative electrode tab; 125. Positive electrode tab; 130. Cover plate; 140. Post; 141. First end surface; 142. Sink hole; 1421. First hole section; 14211. First Straight wall; 14212, first fillet; 14213, first intersection; 14214, first bottom wall; 14215, second intersection; 14216, third fillet; 14217, first inner side surface; 1422, second hole section; 14221, second inner side surface; 143, columnar portion; 144, inner flange; 145, outer flange; 150, sealing nail; 151, first platform; 1511, second straight wall; 1512, first oblique angle; 1513, first bottom surface; 1514, second fillet; 1515, third intersection; 1516, first outer side surface; 152, second platform; 1521, second bottom surface; 1522, fourth intersection; 1523, second outer side surface; 160, insulating member. DETAILED DESCRIPTION

[0044] The following describes the implementation of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and the features in the embodiments can be combined with each other without conflict. It should also be understood that the terms used in the embodiments of the present invention are intended to describe specific implementation schemes, rather than to limit the scope of protection of the present invention. The test methods for which specific conditions are not specified in the following examples are usually carried out under conventional conditions or under the conditions recommended by the manufacturers.

[0045] When numerical ranges are given in the embodiments, it should be understood that unless otherwise specified in the present invention, both endpoints of each numerical range and any value between the two endpoints can be selected. Unless otherwise defined, all technical and scientific terms used in the present invention are in accordance with the prior art mastery of those skilled in the art and the description of the present invention, and any method, device and material of the prior art similar or equivalent to the method, device and material in the embodiments of the present invention can also be used to implement the present invention.

[0046] It should be noted that the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present utility model without substantially changing the technical content.

[0047] The shell assembly is an important part of the secondary battery. The shell assembly usually includes: a shell, a pole and a sealing nail. The shell includes an end wall; the pole is installed through the end wall, and a countersunk hole is provided at one end of the pole located outside the shell. After the pole and other components of the secondary battery are assembled, the sealing nail is used to seal the countersunk hole.

[0048] In the process of sealing the countersunk hole with a sealing pin, the sealing pin needs to be placed in the countersunk hole first, and then welded and fixed to the pole by seam welding. In order to facilitate the sealing pin to enter the countersunk hole, one solution is to increase the matching clearance between the sealing pin and the countersunk hole, but this method will reduce the welding quality of the sealing pin and the pole. Another solution is to set the welding surface of the sealing pin and the countersunk hole to a frustum surface. The frustum surface plays a guiding role and is easy to assemble. However, the welding surface of this method is longer in the radial direction of the end wall, the weld mark formed after welding is wider, and more molten raw materials are required. It is very easy to have the problem of not being fully welded, affecting the welding quality.

[0049] In view of this, the utility model provides a technical solution, which can improve the technical problem of low assembly efficiency of the sealing nail and the pole and improve the welding quality between the sealing nail and the pole by changing the structure of the sealing nail and the pole.

[0050] See also Figures 1 to 14 The utility model provides a shell assembly, a secondary battery 100 and an electronic device 1. The shell assembly includes: a shell 110, a pole 140 and a sealing nail 150.

[0051] See also Figure 1 and Fig.11 , Figure 1 This is a schematic structural diagram of an example of a housing assembly of the utility model; Fig.11The schematic diagram of the structure of an example of a secondary battery of the utility model; the shell 110 includes an end wall 111 and a side wall 112 surrounding the end wall 111. As long as a stable sealing and electrical connection relationship can be formed, the connection between the end wall 111 and the side wall 112 can be achieved in a variety of ways, such as integral stamping, integral casting or split welding. The surrounding of the side wall 112 is not limited, and can be cylindrical or prismatic, or can be surrounded along any other closed loop contour that can match the end wall 111. In this embodiment, the outer edge of the end wall 111 is circular, and the side wall 112 is cylindrical and surrounds the outer edge of the end wall 111, and a circular opening 113 is formed at the end of the side wall 112 away from the end wall 111. Specifically, the diameter of the shell 110 can be determined according to the specific size of the electrode assembly 120, such as 18mm, 21mm, 46mm, etc. The shell 110 may be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. In order to prevent the shell 110 from rusting during long-term use, a layer of rust-proof material such as metal nickel may be plated on the surface of the shell 110.

[0052] See also Figure 1 The pole 140 is installed through the end wall 111 and is insulated from the end wall 111. The structure of the pole 140 can be any suitable form that can pass through the end wall 111. For example, the cross-section can be circular, square, prismatic or a special-shaped profile that can achieve stable conductivity. The pole 140 includes a columnar portion 143, an inner flange 144 and an outer flange 145. The columnar portion 143 passes through the end wall 111; the cross-section of the columnar portion 143 can be circular, square, prismatic or other special-shaped profiles that can achieve stable conductivity. Considering the better sealing and matching effects, in this embodiment, the cross-section of the columnar portion 143 is circular, and the circular design is convenient for processing, assembly and sealing.

[0053] See also Figure 1 The inner flange 144 connects one end of the columnar portion 143 located inside the shell 110, and extends along the side of the end wall 111 facing the inside of the shell 110 toward the outer edge of the end wall 111; the outer cross-section of the inner flange 144 can be circular, square, prismatic or other special-shaped contours that can achieve stable conductivity, and there is no limitation on this; the outer flange 145 connects one end of the columnar portion 143 located outside the shell 110, and extends along the side of the end wall 111 facing the outside of the shell 110 toward the outer edge of the end wall 111; the outer cross-section of the outer flange 145 can be circular, square, prismatic or other special-shaped contours that can achieve stable conductivity, and there is no limitation on this.

[0054] It should be noted that the pole 140 and the end wall 111 are fixed by the inner flange 144 and the outer flange 145. The pole 140 in this embodiment is riveted. The pole 140 is made of a conductive metal material, and the material of the pole 140 can be copper, nickel or aluminum. In this embodiment, the pole 140 is made of aluminum, and the selection of aluminum can easily perform the riveting process.

[0055] Please continue reading Figure 1 , the pole 140 is electrically insulated from the housing 110. Electrical insulation between the pole 140 and the end wall 111 of the housing 110 can be achieved in various ways. For example, insulation can be achieved by placing an insulating member 160 between the pole 140 and the end wall 111. The insulating member 160 includes a sealing ring with an L-shaped, rectangular or O-shaped cross-section, etc. The material of the sealing ring can be EPDM rubber, fluorosilicone rubber or fluororubber, etc., but is not limited thereto. Alternatively, insulation can be achieved by forming an insulating coating layer on a portion of the pole 140. Alternatively, some of the above methods can be applied in combination.

[0056] For further information, see Figure 1 to Figure 2 and Figures 4 to 5 , Figure 2 for Figure 1 A partial enlarged view of the middle A; Figure 4 A cross-sectional view of a pole in an example of a housing assembly of the utility model; Figure 5The schematic diagram of the structure of the pole in an example of the housing assembly of the utility model; the pole 140 has a first end face 141 located outside the housing 110, the first end face 141 is located at the outer flange 145, the first end face 141 is provided with a countersunk hole 142 recessed toward one side of the housing 110, the countersunk hole 142 includes a first hole section 1421 and a second hole section 1422 arranged continuously, the shape of the first hole section 1421 is not limited, for example, it can be a circular hole structure, a square hole structure, a truncated cone hole, a prism hole or other special-shaped hole structure, etc. One or more combinations of shapes. For the convenience of installation, the second hole section 1422 includes a truncated cone-shaped mating surface, for example, it can be a truncated cone hole, a prism hole, a combination of a truncated cone hole and a straight hole, or a combination of a prism hole and a straight hole, etc., which is not limited. In this embodiment, the second hole section 1422 is a truncated cone hole. The first hole segment 1421 is connected to the first end face 141, and the second hole segment 1422 is connected to the end of the first hole segment 1421 away from the first end face 141. The first hole segment 1421 and the second hole segment 1422 can be coaxially arranged or not. Preferably, in this embodiment, the first hole segment 1421 and the second hole segment 1422 are coaxially arranged, which has the effect of convenient processing and assembly. Along the direction of the pole 140 passing through, the projection of the second hole segment 1422 is within the projection of the first hole segment 1421. This arrangement can realize the formation of an annular bottom surface at the connection between the first hole segment 1421 and the second hole segment 1422, which plays the role of supporting the sealing nail 150. In addition, the arrangement of the two hole segments can use one hole segment for positioning and the other hole segment for fixed connection, so as to increase the assembly process window of the sealing nail 150 and the countersunk hole 142.

[0057] See also Figure 1 to Figure 2 and Figure 6 to Figure 7 , Figure 6 A cross-sectional view of a sealing pin in an example of a housing assembly of the utility model; Figure 7It is a schematic diagram of the structure of a sealing pin in an example of a shell component of the utility model; the sealing pin 150 blocks the countersunk hole 142, and the sealing pin 150 includes a first platform 151 and a second platform 152. The first platform 151 and the second platform 152 can be arranged continuously, or other connecting parts can be arranged between the first platform 151 and the second platform 152. There is no limitation on this. In this embodiment, the first platform 151 and the second platform 152 are arranged continuously. The first platform 151 is at least partially accommodated in the first hole section 1421. In some embodiments, the first platform 151 is accommodated in the first hole section 1421. In other embodiments, the first platform 151 is partially accommodated in the first hole section 1421, and another portion protrudes from the first hole section 1421. In this embodiment, the first platform 151 is partially accommodated in the first hole section 1421; the second platform 152 is at least partially accommodated in the second hole section 1422. In some embodiments, the second platform 152 is accommodated in the second hole section 1422. In other embodiments, the second platform 152 is partially accommodated in the second hole section 1422, and another portion protrudes from the second hole section 1422. In this embodiment, the second platform 152 is fully accommodated in the second hole section 1422.

[0058] See also Figure 1 to Figure 2 and Figure 6 to Figure 7 The first platform 151 may be cylindrical, rectangular, truncated cone, prism-shaped pyramid or other polygonal structures, as long as it can form a satisfactory installation relationship with the first hole section 1421. The second platform 152 and the second hole section 1422 form a truncated cone-shaped mating surface, and the small end of the truncated cone-shaped mating surface is away from the first platform 151. The second platform 152 may be, for example, a truncated cone, a prism-shaped pyramid or a combination thereof, and this is not limited. In this embodiment, the second platform 152 is selected to be a truncated cone that matches the second hole section 1422. It should be noted that the taper of the truncated cone of the first platform 151 and the taper of the truncated cone hole of the second hole section 1422 may be equal or unequal, and this is not limited. By forming a frustoconical mating surface between the second platform 152 and the second hole segment 1422, the small end of the frustoconical mating surface is away from the first platform 151. When the second platform 152 of the sealing nail 150 enters the second hole segment 1422 of the countersunk hole 142, the small end of the second platform 152 enters the large end of the second hole segment 1422 first, which has the effect of facilitating entry. The setting of the frustoconical mating surface plays a guiding and positioning role for the installation of the sealing nail 150.

[0059] Furthermore, along the direction in which the pole 140 penetrates, the height of the second platform 152 is greater than the depth of the first hole section 1421, see Figure 4 and Figure 6 The height of the second stage 152 is as follows: Figure 6 As shown in h in FIG. 1 , the depth of the first hole section 1421 is as follows: Figure 4The height of the second platform 152 is greater than the depth of the first hole section 1421, so that before the first platform 151 enters the first hole section 1421, the second platform 152 has already begun to enter the second hole section 1422, so as to guide the sealing nail 150 in advance, thereby reducing the probability of interference between the first platform 151 and the first end surface 141 of the pole 140.

[0060] See also Figure 3 and Figure 8 , Figure 3 This is a structural schematic diagram of a housing assembly in an example of the utility model when the sealing nail is in an extreme state during installation; Figure 8 It is a schematic diagram of the structure when the sealing nail is in the extreme state during the installation process of another example of the shell assembly of the utility model; in one example of the shell assembly of the utility model, the first hole section 1421 includes a first bottom wall 14214 surrounding and connected to the second hole section 1422 and a first inner side surface 14217 surrounding and connected to the first bottom wall 14214, the first inner side surface 14217 is connected to the first end surface 141 away from the end of the first bottom wall 14214, the second hole section 1422 includes a second inner side surface 14221 connected to the first bottom wall 14214, and the first platform 151 includes a first inner side surface 14221 surrounding and connected to the first bottom wall 14214. The second platform 152 includes a first bottom surface 1513 and a first outer side surface 1516 surrounding and connected to the first bottom surface 1513, and the second platform 152 includes a second bottom surface 1521 away from the first platform 151 and a second outer side surface 1523 surrounding and connected to the second bottom surface 1521. Along the radial direction of the end wall 111, the distance between the intersection line of the first inner side surface 14217 and the first end surface 141 and the intersection line of the first bottom wall 14214 and the second inner side surface 14221 is a, and the distance between the outer edge of the first bottom surface 1513 and the outer edge of the second bottom surface 1521 is b. Further, it is defined that a>b. By setting a>b, it can be achieved that even if the second platform 152 deviates from the center and reaches the limit state of connecting with the inner edge of the bottom wall of the first hole section 1421, the outer edge of the bottom surface of the first platform 151 can also enter the first hole section 1421, so as to reduce the risk of interference between the first platform 151 and the first end face 141, reduce the difficulty of positioning, and enable the sealing nail 150 to enter even when the positioning error is large, thereby improving the assembly efficiency.

[0061] Taking into account that demolding radii are usually provided at the junctions of each connecting surface, it should be noted that the intersection line of the first inner side surface 14217 and the first end surface 141 is the critical line where the first end surface 141 begins to sag downward, the intersection line of the first bottom wall 14214 and the second inner side surface 14221 is the critical line where the first bottom wall 14214 begins to sag downward, the outer edge of the first bottom surface 1513 is the critical line where the first bottom surface 1513 begins to sag, and the outer edge of the second bottom surface 1521 is the critical line where the second bottom surface 1521 begins to sag.

[0062] See also Figure 3 and Figure 8 In one example of the shell assembly of the utility model, the outer edge of the first bottom surface 1513 is provided with a bevel and / or a fillet. In this embodiment, the shape of the first platform 151 can be one or more combinations of shapes such as a cylinder, a cuboid, a truncated cone, a prism, or other polygonal structures. The setting of the bevel and / or fillet includes only setting a bevel, only setting a fillet, and setting a combination of a bevel and a fillet, which is not limited. Any of the above settings can improve the problem of interference between the first platform 151 and the first end face 141 during the assembly process, and can also play a guiding role for the sealing nail 150 during the assembly process, further reducing the difficulty of positioning. Even when the positioning error is large, the sealing nail 150 can still enter, thereby improving the assembly efficiency.

[0063] Considering the arrangement of the sealing pin 150 and the frustum surface of the countersunk hole 142 in the prior art, although the frustum surface plays a guiding role and facilitates assembly, the welding surface of this method is relatively long in the radial direction of the end wall 111, the weld mark formed after welding is relatively wide, and more molten raw materials are required, which is very likely to cause the problem of insufficient welding of the weld seam, affecting the welding quality. Therefore, in an example of the shell assembly of the utility model, please refer to Figures 3 to 7 The first inner side surface 14217 includes a first straight wall 14211 parallel to the direction in which the pole 140 passes through, and the first outer side surface 1516 includes a second straight wall 1511 parallel to the direction in which the pole 140 passes through. The first inner side surface 14217 and the first outer side surface 1516 are welding surfaces, and the first straight wall 14211 and the second straight wall 1511 are both set to be parallel to the direction in which the pole 140 passes through, and have a larger processing window during the welding process. The width of the welding surface formed along the radial direction of the end wall 111 is small, forming a narrow weld mark, so as to achieve a full welding effect on the welding surface, thereby obtaining a more reliable welding quality, and also improving the aesthetics of the end of the pole 140.

[0064] In an example of the housing assembly of the present invention, the outer edge of the first bottom surface 1513 is provided with a first bevel 1512, see Figure 3 and Figure 6 to Figure 7 Further, in this embodiment, the distance between the outer edge of the first bottom surface 1513 and the outer edge of the second bottom surface 1521 is b. Figure 3 and Figure 6 As shown, the outer edge of the second bottom surface 1521 is the intersection line of the first bottom surface 1513 and the first bevel 1512. For further information, please refer to Figure 6 The length of the first bevel 1512 along the thickness direction of the first platform 151 is d, and d is less than or equal to 40% of the depth of the first hole section 1421 .

[0065] See also Figure 3 and Figure 6 In this embodiment, the setting of the first bevel angle 1512 can improve the problem of interference between the first platform 151 and the first end face 141; setting d to be less than or equal to 40% of the depth of the first hole section 1421 ensures that the second straight wall 1511 has sufficient thickness to be welded and fixed to the first straight wall 14211 to achieve a more stable welding quality.

[0066] See also Figure 3 and Figure 6 In an example of the shell assembly of the utility model, the length of the first bevel 1512 along the thickness direction perpendicular to the first platform 151 is e, d≤e. In this embodiment, the setting of d≤e is more conducive to guiding the sealing nail 150, so as to further reduce the difficulty of positioning. Even when the positioning error is large, the sealing nail 150 can still enter, thereby improving the assembly efficiency.

[0067] See also Figures 8 to 10 , Fig. 9 A cross-sectional view of a sealing pin in another example of a housing assembly of the present invention; Fig.10 Schematic diagram of the structure of the sealing nail in another example of the housing assembly of the utility model; in another example of the housing assembly of the utility model, the first outer side surface 1516 includes a second straight wall 1511 parallel to the direction in which the pole 140 passes through, that is, the first platform 151 includes a cylindrical segment, the outer edge of the first bottom surface 1513 is provided with a rounded corner, and the outer edge of the second bottom surface 1521 is also provided with a rounded corner. It should be noted that the second bottom surface 1521 is the end surface of the second platform 152 on the side away from the first platform 151. In order to distinguish, the rounded corner provided on the outer edge of the first bottom surface 1513 is named as the second rounded corner 1514, please refer to Fig. 9 and Fig.10 Further, in this embodiment, the distance between the outer edge of the first bottom surface 1513 and the outer edge of the second bottom surface 1521 is b. Figure 8 and Fig. 9 As shown, the outer edge of the first bottom surface 1513 is the intersection line of the first bottom surface 1513 and the rounded corner, that is, the critical line where the first bottom surface 1513 begins to be recessed, named as the third intersection line 1515, and the outer edge of the second bottom surface 1521 is the intersection line of the second bottom surface 1521 and the rounded corner, that is, the critical line where the second bottom surface 1521 begins to be recessed, named as the fourth intersection line 1522.

[0068] See also Figure 2In an example of the housing assembly of the utility model, the first hole section 1421 includes a cylindrical hole section, the first platform 151 includes a cylindrical section matched with the cylindrical hole section, and the difference between the radius of the cylindrical hole section and the radius of the cylindrical section is f, and f≤0.2mm. Setting f within this range is not only conducive to the assembly of the inner side wall of the first hole section 1421 and the outer side wall of the first platform 151, but also can reduce the gap, facilitate welding filling, and help achieve higher welding quality.

[0069] See also Figures 2 to 4 and Figure 6 In an example of the housing assembly of the utility model, along the radial direction of the end wall 111, in the same plane, the distance from the second inner side surface 14221 to the axis of the countersunk hole 142 is x, and the distance from the second outer side surface 1523 to the axis of the sealing pin 150 is y. Since the taper of the frustum of the first platform 151 is smaller than the taper of the frustum of the second hole segment 1422, the gap between the inner side wall of the second hole segment 1422 and the outer side wall of the second platform 152 is variable along the direction in which the pole 140 passes through, and the minimum value of the difference xy between x and y is defined as g, such as Figure 2 As shown, g>f is further defined.

[0070] In the above technical solution, g>f is set, which is convenient for guiding on the one hand, and also reduces the gap on the other hand, which is convenient for welding filling and conducive to achieving higher welding quality.

[0071] See also Figures 4 to 5 In an example of the housing assembly of the utility model, a first fillet 14212 is provided at the junction of the first inner side surface 14217 and the first end surface 141, and the radius of the first fillet 14212 is less than 0.2 mm. The first fillet 14212 can guide the sealing pin 150 during the assembly process, thereby improving the assembly efficiency. Setting the radius of the first fillet 14212 to less than 0.2 mm can provide more molten raw materials for welding, thereby improving the welding quality. It should be noted that in this embodiment, please refer to Figures 4 to 5 , the distance between the intersection line of the first inner side surface 14217 and the first end surface 141 and the intersection line of the first bottom wall 14214 and the second inner side surface 14221 is a. For the convenience of distinction, the intersection line of the first inner side surface 14217 and the first end surface 141 is named as the first intersection line 14213. The first intersection line 14213 is the intersection line connecting the first fillet 14212 and the first end surface 141, that is, the critical line at which the first end surface 141 begins to sag downward; the intersection line of the first bottom wall 14214 and the second inner side surface 14221 is named as the second intersection line 14215. Since the connecting portion of the first bottom wall 14214 and the second inner side surface 14221 is also provided with a fillet, the second intersection line 14215 is the intersection line connecting the first bottom wall 14214 and the fillet, that is, the critical line at which the first bottom wall 14214 begins to sag downward.

[0072] See also Figures 4 to 5 In an example of the housing assembly of the utility model, a bevel and / or a rounded corner is set on the outer edge of the first bottom wall 14214, including only a bevel, only a rounded corner, and a combination of a bevel and a rounded corner, which is not limited. Any of the above settings can achieve avoidance of the first platform 151 to reduce the difficulty of assembly and improve the quality of assembly. In this embodiment, a rounded corner is set on the outer edge of the first bottom wall 14214. For distinction, the rounded corner is named the third rounded corner 14216.

[0073] See also Fig.11 The utility model further provides a secondary battery 100, the battery pack 10 comprising any of the above-mentioned housing components. In an example of the secondary battery 100 of the utility model, the secondary battery 100 further comprises an electrode assembly 120 contained in the housing 110, the electrode assembly 120 is electrically connected to the pole 140, and the sealing nail 150 seals the countersunk hole 142 and is welded and fixed to the pole 140.

[0074] Specifically, see Fig.11 and Fig.12 The electrode assembly 120 is contained in the housing 110, and the electrode assembly 120 is a component where an electrochemical reaction occurs in the secondary battery 100. The housing 110 may contain one or more electrode assemblies 120. The electrode assembly 120 includes a pole piece and a separator 122, and the pole piece and the separator 122 are wound to form a winding structure. Specifically, in this embodiment, the electrode assembly 120 includes a positive pole piece 121, a separator 122, and a negative pole piece 123 axially wound around the housing 110.

[0075] The positive electrode plate 121 includes a positive electrode collector 1211 and a positive electrode active material layer coated on the positive electrode collector 1211. A first coated area 1212 coated with the positive electrode active material layer and a first uncoated area 1213 not coated with the positive electrode active material layer are formed on the positive electrode collector 1211. The first coated area 1212 and the first uncoated area 1213 are arranged axially along the shell 110. The first uncoated area 1213 extends to the outside of the diaphragm 122 at one end in the height direction of the secondary battery 100, and is bent toward the axis of the shell 110 to form a stacked positive electrode ear 125.

[0076] The negative electrode plate 123 includes a negative electrode collector 1231 and a negative electrode active material layer coated on the negative electrode collector 1231, and a second coated area 1232 coated with the negative electrode active material layer and a second uncoated area 1233 not coated with the negative electrode active material layer are formed on the negative electrode collector 1231. The second coated area 1232 and the second uncoated area 1233 are arranged axially along the shell 110, and the second uncoated area 1233 extends to the outside of the diaphragm 122 toward the other end in the height direction of the secondary battery 100, and is bent toward the axis of the shell 110 to form a stacked negative electrode tab 124.

[0077] The diaphragm 122 is arranged between the positive electrode plate 121 and the negative electrode plate 123 to isolate the positive electrode active material layer from the negative electrode active material layer. Taking the lithium-ion secondary battery 100 as an example, the material of the positive electrode collector 1211 can be aluminum, and the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The material of the negative electrode collector 1231 can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The base material of the diaphragm 122 can be PP (polypropylene) or PE (polyethylene, polyethylene), etc. In order to protect and insulate the battery cell, an insulating film can also be coated on the outside of the battery cell, and the insulating film can be synthesized by PP, PE, PET, PVC or other high molecular polymer materials.

[0078] See also Fig.11 and Fig.12 Further, the positive electrode tab 125 in the present invention faces the end wall 111 or the opening 113, and the negative electrode tab 124 faces the other end of the housing 110. In this embodiment, the positive electrode tab 125 faces the end wall 111 and is electrically connected to the pole 140 so that the pole 140 is positively charged, and the negative electrode tab 124 faces the opening 113, and the housing 110 is electrically connected to the negative electrode tab 124, so that it is negatively charged. However, in other embodiments, the negative electrode tab 124 can be connected to the pole 140, and the positive electrode tab 125 can be connected to the housing 110.

[0079] See also Fig.11 The cover plate 130 is sealed and installed on the opening 113; the outer edge shape of the cover plate 130 corresponds to the shape of the opening 113, and is connected to the side wall 112 to seal the opening 113. The installation method of the cover plate 130 includes but is not limited to mechanical sealing or welding sealing. In this embodiment, the cover plate 130 is sealed and blocked on the opening 113 by mechanical sealing.

[0080] The sealing pin 150 seals the countersunk hole 142, and the edge of the first platform 151 and the edge of the first hole section 1421 are connected by welding. The welding method can be seam welding, penetration welding, etc. In this embodiment, the outer wall of the first platform 151 and the inner wall of the first hole section 1421 are welding surfaces, and are fixedly connected by seam welding.

[0081] See also Fig.14 , Fig.14 The utility model also provides an electronic device 1, which includes the above-mentioned secondary battery 100. Specifically, a plurality of secondary batteries 100 are connected in series or in parallel, or in series and in parallel to form a battery pack 10. The working part 11 is electrically connected to the battery pack 10 to obtain power support. Fig.13 , Fig.13 Schematic diagram of an example of a battery pack of the utility model; as an example, the battery pack 10 also includes a box body 101 and a box cover 102, a plurality of secondary batteries 100 are placed in the box body 101, and the box cover 102 is sealed on the box body 101 to protect the plurality of secondary batteries 100. It should be noted that the battery pack 10 may also include a battery pack thermal management system, a circuit board and other parts in addition to the secondary battery 100 of the utility model, and the battery pack 10 may be a battery module, a battery pack, an energy storage cabinet, etc.; they will not be described one by one here.

[0082] As an example, the electronic device 1 is a vehicle, which can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc., but is not limited thereto. The working part 11 is a vehicle body, and the battery pack 10 is arranged at the bottom of the vehicle body and provides power support for the driving of the vehicle or the operation of the electrical components in the vehicle. However, in some other embodiments, the electronic device 1 can also be a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy and an electric tool, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc.; the working part 11 can be a unit component that can obtain the power of the battery pack 10 and perform corresponding work, such as a fan blade rotation unit of a fan, a vacuum cleaner unit, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc.; electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc. The embodiment of the present application does not impose any special limitation on the electronic device 1 .

[0083] In the housing assembly of the utility model, the second platform and the second hole section form a frustum-shaped mating surface, and the small end of the frustum-shaped mating surface is far away from the first platform. In this technical solution, when the second platform of the sealing nail enters the second hole section of the countersunk hole, the small end of the second platform first enters the large end of the second hole section, which has the effect of facilitating entry, and the setting of the frustum-shaped mating surface plays a guiding and positioning role for the installation of the sealing nail. In addition, the height of the second platform is greater than the depth of the first hole section, so that before the first platform enters the first hole section, the second platform has begun to enter the second hole section, so as to play a pre-guiding effect for the sealing nail, thereby reducing the probability of interference between the first platform and the first end face of the pole. Therefore, the utility model effectively overcomes some practical problems in the prior art and has a high utilization value and use significance. The above embodiments only illustrate the principle and effect of the utility model, and are not used to limit the utility model. Anyone familiar with this technology can modify or change the above embodiments without violating the spirit and scope of the utility model. Therefore, all equivalent modifications or changes made by those having ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A housing assembly, characterized in that: include: a housing including end walls; A pole, which is installed through the end wall, the pole having a first end face located outside the shell, the first end face being provided with a countersunk hole recessed toward one side of the shell, the countersunk hole comprising a first hole segment and a second hole segment which are continuously arranged, the first hole segment being connected to the first end face, the second hole segment being connected to an end of the first hole segment away from the first end face, and the projection of the second hole segment being within the projection of the first hole segment along the direction in which the pole passes through; A sealing nail, sealing the countersunk hole, the sealing nail comprising a first platform portion and a second platform portion, the first platform portion is at least partially accommodated in the first hole segment, the second platform portion is at least partially accommodated in the second hole segment, a frustum-shaped mating surface is formed between the second platform portion and the second hole segment, and the small end of the frustum-shaped mating surface is away from the first platform portion; Wherein, along the direction in which the pole penetrates, the height of the second platform is greater than the depth of the first hole segment.

2. The housing assembly according to claim 1, characterized in that: The first hole section includes a first bottom wall surrounding and connected to the second hole section and a first inner side surface surrounding and connected to the first bottom wall, the first inner side surface is connected to the first end surface at one end away from the first bottom wall, the second hole section includes a second inner side surface connected to the first bottom wall, the first platform includes a first bottom surface surrounding and connected to the second platform and a first outer side surface surrounding and connected to the first bottom surface, the second platform includes a second bottom surface away from the first platform and a second outer side surface surrounding and connected to the second bottom surface, along the radial direction of the end wall, the distance between the intersection line of the first inner side surface and the first end surface and the intersection line of the first bottom wall and the second inner side surface is a, and the distance between the outer edge of the first bottom surface and the outer edge of the second bottom surface is b, wherein a>b.

3. The housing assembly according to claim 2, characterized in that: The outer edge of the first bottom surface is provided with a bevel and / or a rounded corner.

4. The housing assembly according to claim 2, characterized in that: The first inner side surface includes a first straight wall parallel to the direction in which the pole passes through, and the first outer side surface includes a second straight wall parallel to the direction in which the pole passes through.

5. The housing assembly according to claim 4, characterized in that: The outer edge of the first bottom surface is provided with a first oblique angle, and the length of the first oblique angle along the direction in which the pole penetrates is d, wherein d is less than or equal to 40% of the depth of the first hole section.

6. The housing assembly according to claim 5, characterized in that: The length of the first oblique angle along a direction perpendicular to the direction in which the pole passes through is e, wherein d≤e.

7. The housing assembly according to claim 2, characterized in that: The first hole segment includes a cylindrical hole segment, the first platform includes a cylindrical segment matching the cylindrical hole segment, the difference between the radius of the cylindrical hole segment and the radius of the cylindrical segment is f, and f≤0.2 mm.

8. The housing assembly according to claim 7, characterized in that: Along the radial direction of the end wall, in the same plane, the distance from the second inner side surface to the axis of the countersunk hole is x, and the distance from the second outer side surface to the axis of the sealing pin is y, and the minimum value of xy is g, wherein g>f.

9. The housing assembly according to claim 2, characterized in that: A first fillet is provided at the junction of the first inner side surface and the first end surface, and the radius of the first fillet is less than 0.2 mm.

10. A secondary battery, characterized in that: The secondary battery comprises a shell assembly as claimed in any one of claims 1 to 9, wherein the secondary battery further comprises an electrode assembly housed inside the shell, the electrode assembly is electrically connected to the pole, a sealing pin seals the countersunk hole, and an edge of the first platform portion and an edge of the first hole segment are connected by welding.

11. An electronic device, characterized in that: The secondary battery according to claim 10 is included.

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