A sealing cover, a battery top cover, a battery monomer, a battery assembly and an electric device

Abstract

The utility model relates to battery technical field especially relates to a sealing cover, battery top cover, battery monomer, battery assembly and electric device. Sealing cover includes bending part and cover body, and bending part is around the outer periphery of cover body and protrudes from cover body, and bending part is inclined to the direction of away from cover body from cover body, in the radial of injection hole, the width of the free end of bending part is W1, the width of the end of bending part and cover body connection is W2, satisfy, W1W2, then sealing cover makes the stamping material have the extension space when manufacturing, avoids the equal thickness stamping of sealing cover in the conventional technology, and the material cannot extend at the root of sealing cover and causes the stress to form the wrinkle hole and other appearance quality risk, and sealing cover is easier to manufacture, and the quality of sealing cover is better.

Description

Technical Field

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

[0002] Power batteries serve as the power source for electric vehicles and other electric vehicles, and the sealing performance of their battery filling holes is extremely important.

[0003] In conventional technology, the battery filler hole is located on the top cover of the battery, and a sealing cap is welded to the top cover to seal the filler hole. However, the sealing cap is prone to quality problems, resulting in limited sealing effectiveness for the filler hole. Utility Model Content

[0004] This utility model provides a sealing cap, a battery top cover, a battery cell, a battery assembly, and an electrical device to solve the technical problem in the prior art where the sealing cap used to seal the battery filling hole is prone to quality problems, resulting in a limited sealing effect of the sealing cap on the filling hole.

[0005] In a first aspect, this utility model provides a sealing cap for sealing a battery filling hole. The sealing cap includes a bent portion and a cap body. The bent portion is disposed around the outer periphery of the cap body and protrudes from the cap body. The bent portion is inclined from the cap body in a direction away from the cap body. In the radial direction of the filling hole, the width of the free end of the bent portion is W1, and the width of the end of the bent portion connected to the cap body is W2, satisfying that W1 < W2.

[0006] In some embodiments, the angle between the inner wall of the bent portion and the cross section perpendicular to the centerline of the sealing cover and toward the center of the sealing cover is α, satisfying 120°≤α≤135°.

[0007] In some embodiments, the angle between the outer wall of the sealing cap and the cross section perpendicular to the centerline of the sealing cap and toward the center of the sealing cap is β, satisfying 101°≤β≤110°.

[0008] In some embodiments, 0.8mm ≤ W1 ≤ 1.2mm.

[0009] In some embodiments, at least one of the inner wall of the bend and the outer wall of the sealing cover is configured as a frustum-shaped structure.

[0010] In some embodiments, the cover body has a flat plate structure.

[0011] In some embodiments, in a direction parallel to the centerline of the sealing cover, the height of the sealing cover is H1, satisfying 0.7mm≤H1≤1.4mm; and / or, the height of the cover body is H2, satisfying 0.6mm≤H2≤0.8mm.

[0012] In some embodiments, the sealing cap is a one-piece molded part.

[0013] Secondly, this utility model embodiment provides a battery top cover, the battery top cover comprising:

[0014] Cover plate, wherein the cover plate is provided with a liquid injection hole;

[0015] As described above, the sealing cap is disposed on the cover plate to block the injection hole.

[0016] In some embodiments, the injection hole includes an installation groove and an injection channel connected in sequence, and the sealing cap is installed in the installation groove.

[0017] In some embodiments, the wall of the mounting groove is inclined, and the outer wall of the sealing cover is fitted to the wall of the mounting groove.

[0018] In some embodiments, there is a gap between the surface of the sealing cap facing the injection channel and the bottom of the mounting groove.

[0019] In some embodiments, the height of the gap is H4 in the direction parallel to the centerline of the sealing cover, satisfying 0.1mm≤H4≤0.2mm.

[0020] In some embodiments, a sealing pin is sealed and installed inside the injection channel, and the sealing pin is spaced apart from the sealing cap.

[0021] In some embodiments, the injection channel includes a clearance groove and a through hole connected in sequence, the top of the clearance groove is connected to the bottom of the mounting groove, and the diameter of the clearance groove is larger than the diameter of the through hole; the sealing pin includes a head and a post connected in series, the head is fitted in the clearance groove and the head does not protrude or partially protrudes from the bottom of the mounting groove, and the post is fitted in the through hole.

[0022] In some embodiments, the battery top cover further includes a welded portion, and the free end of the bent portion is connected to the cover plate through the welded portion; in a direction parallel to the centerline of the sealing cover, the height of the sealing cover is H1, and the height of the welded portion is H3, satisfying 0.4H1≤H3≤0.7H1.

[0023] In some embodiments, the cover plate is further provided with an annular groove, the annular groove being disposed around the outer periphery of the top end of the injection hole, at least a portion of the weld portion being disposed in the annular groove, and the weld portion not protruding from the top of the annular groove.

[0024] Thirdly, this utility model embodiment provides a battery cell, which includes a battery casing and a battery top cover as described above. The battery casing has an opening, and the opening is fitted onto the battery top cover.

[0025] Fourthly, this utility model provides a battery assembly, which includes the battery cells as described above.

[0026] Fifthly, this utility model embodiment also provides an electrical device, which includes the above-mentioned components.

[0027] The battery assembly described above, and / or the battery cell described above.

[0028] Compared with prior art, the present invention has the following advantages:

[0029] The sealing cap in this embodiment includes a bent portion and a cap body. The bent portion is inclined away from the cap body, so that when the bent portion is welded to the cap plate with the injection hole, the bent portion can provide plastic deformation, so that the stress generated after welding is offset by the plastic deformation of the material, thus avoiding cracks in the sealing cap after welding. Furthermore, the width W1 of the free end of the bent portion is smaller than the width W2 of the end where the bent portion connects to the cap body. This allows for the stretching of the stamping material during manufacturing, avoiding the appearance quality risks such as wrinkles and holes caused by the inability to stretch the material at the root of the sealing cap due to uniform thickness stamping in conventional technologies. The sealing cap is easier to manufacture and has better quality, resulting in a better sealing effect by effectively blocking the injection hole.

[0030] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0032] Figure 1 This is a schematic diagram of the sealing cap structure in an embodiment of this application;

[0033] Figure 2 yes Figure 1A schematic diagram of the structure in the AA cross-sectional view;

[0034] Figure 3 This is a schematic diagram of the structure of the battery top cover in an embodiment of this application;

[0035] Figure 4 This is a structural schematic diagram of an exploded view of the battery top cover in an embodiment of this application;

[0036] Figure 5 This is a structural schematic diagram of the main view of the battery top cover in an embodiment of this application;

[0037] Figure 6 yes Figure 5 A structural schematic diagram of the BB cross-section;

[0038] Figure 7 This is a schematic diagram of the welding structure of the cover plate and the sealing cap in an embodiment of this application.

[0039] Figure label:

[0040] 1. Cover plate; 11. Injection hole; 111. Mounting groove; 112. Injection channel; 113. Clearance groove; 114. Through hole; 12. Annular groove;

[0041] 2. Sealing cap; 21. Bend; 211. Inner wall; 212. Outer wall; 22. Cap body; 221. First surface; 222. Second surface; 23. Gap;

[0042] 3. Sealing nails;

[0043] 4. Welded section;

[0044] X, radial; Y, axial. Detailed Implementation

[0045] Exemplary embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0046] Currently, batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in military equipment and aerospace and other fields. Therefore, the application of batteries is becoming more and more widespread.

[0047] In conventional batteries, the battery casing typically has an injection hole 11 on the top cover. During the production of power batteries, electrolyte is injected into the battery casing through the injection hole 11, and the injection hole is sealed by a sealing cap 2. However, the sealing cap has a complex structure and is prone to quality problems, resulting in limited sealing effect of the sealing cap 2 on the injection hole.

[0048] The following is in conjunction with the appendix Figures 1-7 The sealing cover, battery top cover, battery cell, battery assembly, and electrical device provided in this application will be described in detail through specific embodiments and application scenarios.

[0049] Reference Figure 1 and Figure 2 As shown in the figure, this application discloses a sealing cap 2 for sealing a battery filling hole. The sealing cap 2 includes a bent portion 21 and a cap body 22. The bent portion 21 is disposed around the outer periphery of the cap body 22 and protrudes from the cap body 22. The bent portion 21 is inclined from the cap body 22 in a direction away from the cap body 22. In the radial direction X of the filling hole 11, the width of the free end of the bent portion 21 is W1, and the width of the end of the bent portion 21 connected to the cap body 22 is W2, satisfying that W1 < W2.

[0050] Reference Figure 1 As shown, the bending portion 21 is inclined from the cover body 22 in a direction away from the cover body 22, so that the sealing cover 2 has a concave bowl-shaped structure, and the free end of the bending portion 21 is the end of the bending portion 21 away from the cover body 22. The bending portion 21 and the sealing cover 2 can be a stamped integral structure.

[0051] In this embodiment, the bent portion 21 is inclined away from the cover body 22, so that when the bent portion 21 is welded to the cover plate 1 with the injection hole 11, the bent portion 21 can provide plastic deformation, so that the stress generated after welding is offset by the plastic deformation of the material, which can prevent cracks from appearing after the sealing cover 2 is welded. In addition, the width W1 of the free end of the bent portion 21 is smaller than the width W2 of the end where the bent portion 21 is connected to the cover body 22. During the manufacturing of the sealing cover 2, the stamping material can have room for extension, avoiding the risk of appearance quality such as wrinkles and holes caused by the inability of the material to extend at the root of the bent portion (equivalent to the end where the bent portion is connected to the cover plate body) due to the uniform thickness stamping of the sealing cover 2 in conventional technology. The sealing cover 2 is easier to manufacture and has better quality. As a result, the sealing cover 2 has a better effect in sealing the injection hole 11, that is, a better sealing effect.

[0052] It is understandable that the width W1 of the free end of the bent portion 21 in the radial direction X of the injection hole 11 is set according to the usage requirements. For example, 0.8mm≤W1≤1.2mm. When the width W1 of the free end of the bent portion 21 is within the above range, it can provide a suitable welding area on the one hand, and facilitate the forming of the sealing cap 2 and ensure the strength of the sealing structure on the other hand.

[0053] In specific examples, W1 is one of 0.8mm, 0.85mm, 0.9mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, or multiple values ​​between the above values.

[0054] In some possible embodiments, the inner wall 211 of the bent portion 21 facing the middle of the cover body 22 and the outer wall 212 of the sealing cover 2 facing away from the middle of the cover body 22 are respectively formed into a frustum-shaped structure. In this way, both the inner wall 211 and the outer wall 212 are inclined wall structures. In addition, the width W1 at the free end of the bent portion 21 is smaller than the width W2 at the end where the bent portion 21 connects to the cover body 22. This makes the sealing cover 2 easier to stamp and mold during manufacturing, making it easier to process and manufacture, improving the finished product accuracy of the sealing cover 2, and reducing manufacturing costs. The side wall of the bent portion 21 facing away from the middle of the cover body 22 forms part of the outer wall 212 of the sealing cover 2.

[0055] In this case, since the portion of the bent part 21 protruding from the cap body 22 is in the radial direction X of the injection hole 11, the width of the free end of the bent part 21 is smaller than the width of the end where the bent part 21 connects to the cap body 22. That is, the inclination angles of the inner wall 211 and the outer wall 212 are different, and they are inclined in directions away from the cap body 22. In the radial direction X of the injection hole 11, the portions of the inner wall 211 and the outer wall 212 at their free ends are relatively close, while the portion of the inner wall 211 connected to the cap body 22 is relatively far from the corresponding outer wall 212.

[0056] It is understandable that the inner wall 211 of the bent portion 21 can be formed into a frustum-shaped structure, or the outer wall 212 of the sealing cover 2 can be formed into a frustum-shaped structure, or the inner wall 211 and the outer wall 212 can be formed into elliptical frustum-shaped structures, etc., as long as the usage requirements of the sealing cover 2 are met.

[0057] In some possible implementations, the cover body 22 has a flat plate structure and has a first surface 221 and a second surface 222 disposed opposite to each other. The first surface 221 and the second surface 222 are respectively planes. The first surface 221 and the second surface 222 are perpendicular to the center line of the sealing cover 2, that is, parallel to the cross section perpendicular to the center line of the sealing cover 2.

[0058] In some possible implementations, refer to Figure 2As shown, the inner wall 211 of the bent portion 21 is connected to the first surface 221. The inner wall 211 is inclined away from the first surface 221, and the included angle between the inner wall 211 and the first surface 221 is α, which satisfies 120°≤α≤135°. In this embodiment, when the included angle α satisfies the above range, the sealing cap 2 is easier to stamp and mold during processing, which can improve the finished product accuracy of the sealing cap 2. It is also easier to process and manufacture, thereby improving the finished product accuracy of the sealing cap 2 and reducing manufacturing costs.

[0059] In practical use, α is one of 120°, 122°, 124°, 126°, 128°, 130°, 132°, 134°, 135°, as well as multiple angles between the above angles.

[0060] In some possible implementations, refer to Figure 2 As shown, the outer wall 212 of the sealing cap 2 is connected to the second surface 222. The outer wall 212 is inclined away from the second surface 222, and the included angle between the outer wall 212 and the second surface 222 is β, which satisfies 101°≤β≤110°. In this embodiment, when the included angle β satisfies the above range, it facilitates the stirring of the weld pool during laser welding to form an integral weld pool, and promotes the fluidity of the weld pool, avoiding incomplete welds or ineffective weld areas.

[0061] In practical use, β is one of 101°, 102°, 103°, 104°, 105°, 106°, 107°, 108°, 109°, 110°, as well as multiple angles between the above angles.

[0062] It is understood that the height of the sealing cover 2 in the direction parallel to the centerline of the sealing cover 2 also has a certain dimensional relationship to meet the usage requirements on the battery top cover. In some possible embodiments, the height of the sealing cover 2 in the direction parallel to the centerline of the sealing cover 2 is H1, satisfying 0.7mm≤H1≤1.4mm. For example, H1 is one of 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, and 1.4mm, or multiple values ​​between the above values. In other possible embodiments, the height of the cover body 22 in the direction parallel to the centerline of the sealing cover 2 is H2, satisfying 0.6mm≤H2≤0.8mm. For example, H2 is one of 0.6mm, 0.63mm, 0.66mm, 0.69mm, 0.7mm, 0.72mm, 0.74mm, 0.76mm, 0.78mm, and 0.8mm, or multiple values ​​between the above values.

[0063] This application discloses a battery top cover, which includes a cover plate 1 and a sealing cap 2 as described above. The cover plate 1 has an injection hole 11 formed thereon; the sealing cap 2 is disposed on the cover plate 1 to seal the injection hole 11. Because the sealing cap 2 has the advantage of high quality, it can more effectively seal the injection hole 11, thereby making the battery top cover more reliable.

[0064] In some possible implementations, refer to Figure 5 and Figure 6 As shown, the injection hole 11 includes an installation groove 111 and an injection channel 112 connected in sequence, and the installation groove 111 and the injection channel 112 are coaxially arranged; the sealing cover 2 is installed in the installation groove 111, and the bent part 21 of the edge of the sealing cover 2 is sealed and welded to the cover plate 1 to seal the injection hole 11.

[0065] In this embodiment, the mounting groove 111 has no stepped structure, making it easy to clean. After electrolyte is injected through the injection hole 11, it is difficult for electrolyte to remain in the mounting groove 111. Even if it does remain, the sealing cover 2 has a large height in the axial Y direction of the injection hole 11, and the weld portion 4 has a large gap with the bottom of the mounting groove 11. This can avoid problems such as weld explosion during laser welding of the bent portion 21 and the cover plate 1, which would otherwise result in poor welding quality.

[0066] In some possible implementations, the wall of the mounting groove 111 is inclined, and the outer wall 212 of the sealing cover 2 is fitted to the wall of the mounting groove 111. In this way, the sealing cover 2 can be conveniently placed in the mounting groove 111, and the reliability between the sealing cover 2 and the mounting groove 111 can be guaranteed.

[0067] In some possible implementations, there is a gap 23 between the surface of the sealing cap 2 facing the injection channel 112 and the bottom of the mounting groove 111.

[0068] In this embodiment of the application, the gap 23 is provided to avoid excessive fit between the sealing cover 2 and the mounting groove 111, which would affect the sealing effect of the sealing cover 2.

[0069] In some possible implementations, the height of the gap 23 is H4 in the direction parallel to the centerline of the sealing cover 2, satisfying 0.1mm ≤ H4 ≤ 0.2mm. In the embodiments of this application, when the height H4 of the gap 23 is within the above range, the structure after the sealing cover 2 and the cover plate 1 are connected is compact, improving space utilization.

[0070] In practical use, H4 is one of 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, or multiple values ​​between the above values.

[0071] In some possible implementations, a sealing pin 3 is installed inside the injection channel 112, which can enhance the sealing effect on the injection hole 11; the sealing cap 2 and the sealing pin 3 are spaced apart to avoid interference between the sealing cap 2 and the sealing pin 3, which would affect the assembly of the sealing cap 2 and the sealing pin 3.

[0072] Reference Figure 6 As shown, a sealing pin 3 can be used to seal the electrolyte injection hole 11 of the cover plate 1. That is, a sealing pin 3 is installed in the electrolyte injection channel 112 to isolate the sealing cover 2 from contact with the electrolyte, avoid weld corrosion causing sealing failure, and prevent weld slag from falling into the battery casing during the welding process. The sealing pin 3 and the electrolyte injection channel 112 are connected by an interference fit to achieve a better sealing effect and prevent the sealing pin 3 from falling into the battery casing and the electrolyte from flowing out.

[0073] To better prevent the sealing pin 3 from falling into the battery casing and to achieve a better sealing effect, in some possible embodiments, the injection channel 112 includes a clearance groove 113 and a through hole 114 connected in sequence. The clearance groove 113 is connected to the bottom of the mounting groove 111, and the diameter of the clearance groove 113 is larger than the diameter of the through hole 114. The mounting groove 111, the clearance groove 113, and the through hole 114 are arranged coaxially in sequence. The sealing pin 3 includes a head and a post connected in sequence. The diameter of the head is larger than the diameter of the post. The head is fitted into the clearance groove 113 and does not protrude or only partially protrudes from the bottom of the mounting groove 111. The post is fitted into the through hole 114.

[0074] In this embodiment, the column and the injection hole 11 are interference-fitted to ensure a good sealing effect for the sealing nail 3. The head is fitted into the clearance groove 113, and the column is fitted into the through hole 114. The diameter of the head is larger than the diameter of the column, preventing the sealing nail 3 from falling into the battery casing. Furthermore, the head also enhances the sealing performance.

[0075] The material of the sealing nail 3 can be set according to the usage requirements, such as using a variety of suitable rubber materials.

[0076] Understandably, if the electrolyte has a low corrosive effect on the weld, the sealing nail 3 can be omitted, and the sealing cap 2 can be used directly to seal the injection hole 11 of the cover plate 1.

[0077] After the sealing cap 2 is welded to the cover plate 1, a weld seam 4 is formed. The free end of the bent part 21 is connected to the cover plate 1 through the weld seam 4. In the direction parallel to the centerline of the sealing cap 2, the height of the sealing cap 2 is H1, and the height of the weld seam 4 is H3, which satisfies 0.4H1≤H3≤0.7H1. Thus, the weld seam 4 has a large depth, the connection strength at the weld seam 4 is improved, and the sealing performance after the sealing cap 2 and the cover plate 1 are welded is guaranteed.

[0078] In some possible embodiments, the cover plate 1 is further provided with an annular groove 12, which surrounds the outer periphery of the top of the injection hole 11, and at least a portion of the weld portion 4 is provided in the annular groove 12, wherein the weld portion 4 does not protrude from the top of the annular groove 12.

[0079] In this embodiment of the application, by setting the annular groove 12, the weld seam 4 formed by welding can be prevented from protruding from the top of the annular groove 12, that is, the weld seam 4 is prevented from protruding from the surface of the cover plate 1, which facilitates the subsequent assembly of the battery top cover and avoids interference problems.

[0080] This application provides a battery top cover, the sealing cover 2 being concave bowl-shaped, and the sealing cover 2 being an integral structure formed by stamping. The sealing cover 2 includes a flat cover body 22 and a bent portion 21 surrounding the cover body 22. The portion of the bent portion 21 protruding from the cover body 22 is on the radial X of the injection hole 11. The width of the free end of the bent portion 21 is less than the width of the end of the bent portion 21 connected to the cover body 22, which allows the stamping material to have room for extension. This avoids the quality risks such as the root material not being able to extend when the sealing cover 2 is stamped with the same thickness, which may cause stress to form wrinkles and holes. The sealing cover 2 of this application is easier to manufacture by stamping and has the advantage of good quality. Moreover, the bent portion 21 is a sloping wall structure, which allows the bent portion 21 to be plastically deformed. The stress generated after welding is offset by the plastic deformation of the material, which can avoid cracks in the sealing cover 2 after welding. At the same time, the weld pool (the weld pool is the weld seam 4) is deeper, resulting in better structural strength.

[0081] When installing the battery top cover, first insert the sealing nail 3 into the liquid injection channel 112, and then place the sealing cover 2 into the liquid injection hole 11 of the cover plate 1. The sealing cover 2 automatically slides down to the bottom of the mounting groove 111, with a gap 23 between it and the bottom of the groove and spaced apart from the sealing nail 3. Then, weld the bent part 21 of the sealing cover 2 and the outer periphery of the mounting groove 111 to form a weld part 4, thus completing the assembly of the battery top cover.

[0082] In the battery top cover provided in this application, refer to Figure 3 As shown, the cover plate 1 is circular and suitable for cylindrical batteries. The cover plate 1 is disposed on the top or bottom of the battery casing. In other embodiments, the cover plate 1 can also be rectangular and suitable for square or rectangular battery cells.

[0083] The battery cover disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system incorporating the battery cover, battery cells, and battery modules disclosed in this application can be used.

[0084] This application discloses a battery cell, which includes a battery casing with an opening, and the opening is fitted with a battery top cover as described above. Because the sealing cap 2 of the battery top cover is easy to manufacture, of good quality, and its bent portion 21 is malleable, preventing cracks after welding, the battery cell has better sealing performance, higher quality, and a longer lifespan.

[0085] This application discloses a battery assembly, which includes a battery cell as described above and a housing for accommodating the battery cell, wherein the housing is used to provide housing space for the battery cell.

[0086] This application discloses an electrical device, which includes a battery assembly as described above, and / or a battery cell as described above.

[0087] The electrical devices provided in this application can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc. In some embodiments of this application, the battery can serve not only as the operating power source for the electrical device but also as the driving power source, providing driving force for the electrical device.

[0088] In this embodiment, the sealing cover 2, the battery top cover, the battery cell, the battery assembly, and the electrical device can be referenced to each other and have the same or similar beneficial effects as any of the aforementioned sealing covers 2 and battery top covers. To avoid repetition, they will not be described again here.

[0089] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0090] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0091] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A sealing cap for closing a liquid injection hole of a battery, characterized by, The sealing cap (2) includes a bent portion (21) and a cap body (22). The bent portion (21) is arranged around the outer periphery of the cap body (22) and protrudes from the cap body (22). The bent portion (21) is inclined from the cap body (22) in a direction away from the cap body (22). In the radial direction (X) of the injection hole (11), the width of the free end of the bent portion (21) is W1, and the width of the end of the bent portion (21) connected to the cap body (22) is W2, satisfying that W1 < W2.

2. The closure of claim 1, wherein The inner wall (211) of the bent portion (21) and the cross section perpendicular to the center line of the sealing cover (2) have an angle α toward the center of the sealing cover (2), satisfying 120°≤α≤135°.

3. The closure of claim 1, wherein The angle between the outer wall (212) of the sealing cover (2) and the cross section perpendicular to the center line of the sealing cover (2) and the center of the sealing cover (2) is β, which satisfies 101°≤β≤110°.

4. The closure of claim 1, wherein 0.8mm≤W1≤1.2mm.

5. The closure of claim 1, wherein At least one of the inner wall (211) of the bent portion (21) and the outer wall (212) of the sealing cover (2) is arranged in a frustum-shaped structure.

6. The closure of claim 1, wherein The cover body (22) has a flat plate structure.

7. The closure of claim 1, wherein In the direction parallel to the centerline of the sealing cap (2), The height of the sealing cap (2) is H1, satisfying 0.7mm ≤ H1 ≤ 1.4mm; and / or, The height of the cover body (22) is H2, which satisfies 0.6mm≤H2≤0.8mm.

8. The closure of claim 1, wherein The sealing cap (2) is a one-piece molded part.

9. A battery top cover characterized by, include: Cover plate (1), the cover plate (1) is provided with a liquid injection hole (11); The sealing cap (2) according to any one of claims 1-8, the sealing cap (2) is disposed on the cover plate (1) to block the injection hole (11).

10. The battery header of claim 9, wherein, The injection hole (11) includes an installation groove (111) and an injection channel (112) connected in sequence, and the sealing cap (2) is installed in the installation groove (111).

11. The battery header of claim 10, wherein, The wall of the mounting groove (111) is inclined, and the outer wall (212) of the sealing cover (2) is fitted to the wall of the mounting groove (111).

12. The battery header of claim 10, wherein, There is a gap (23) between the surface of the sealing cap (2) facing the injection channel (112) and the bottom of the mounting groove (111).

13. The battery header of claim 12, wherein, In the direction parallel to the centerline of the sealing cover (2), the height of the gap (23) is H4, which satisfies 0.1mm≤H4≤0.2mm.

14. The battery cover of claim 10, wherein, A sealing pin (3) is installed inside the injection channel (112), and the sealing pin (3) is spaced apart from the sealing cover (2).

15. The battery cover of claim 14, wherein the cover includes a plurality of tabs extending from the cover, the tabs being configured to be received in the plurality of slots of the battery cover retainer. The injection channel (112) includes a relief groove (113) and a through hole (114) connected in sequence. The top of the relief groove (113) is connected to the bottom of the mounting groove (111). The diameter of the relief groove (113) is larger than the diameter of the through hole (114). The sealing nail (3) includes a head and a post connected together. The head is fitted in the relief groove (113) and does not protrude or protrudes partially from the bottom of the mounting groove (111). The post is fitted in the through hole (114).

16. The battery cover of claim 9, wherein: The battery top cover also includes a welded section (4), and the free end of the bent section (21) is connected to the cover plate (1) through the welded section (4); in the direction parallel to the centerline of the sealing cover (2), the height of the sealing cover (2) is H1, and the height of the welded section (4) is H3, satisfying 0.4H1≤H3≤0.7H1.

17. The battery cover of claim 16, wherein the cover includes a plurality of tabs extending from the cover, the tabs being configured to be received within the plurality of slots of the battery cover. The cover plate (1) is also provided with an annular groove (12), which is arranged around the outer periphery of the top of the injection hole (11). At least part of the weld portion (4) is provided in the annular groove (12), and the weld portion (4) does not protrude from the top of the annular groove (12).

18. A battery cell, characterized by Includes a battery casing, wherein the battery casing is provided with an opening; The battery top cover as described in any one of claims 1-17, wherein the battery top cover is fitted to the opening.

19. A battery assembly characterized by, Includes the battery cell as described in claim 18.

20. An electrical device, comprising: Includes the battery assembly as described in claim 19, and / or the battery cell as described in claim 18.

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