Top cover assembly, battery and electric device

Abstract

The utility model provides a kind of top cover assembly, battery and electric equipment, top cover assembly includes elastic sealing ring and compression ring, compression ring includes the first ring body and second ring body sequentially connected along the axial direction of elastic sealing ring, the outer diameter of first ring body is greater than the outer diameter of second ring body, second ring body is used to abut with elastic sealing ring, so that part of elastic sealing ring is compressed by second ring body, another part is set to swell, along the axial direction of elastic sealing ring, the distance between the swelling part of elastic sealing ring and first ring body is L1, wherein, L1 is greater than or equal to 0. Thus, the radial expansion of elastic sealing ring is accurately limited, so that the radial dimension of elastic sealing ring is always maintained within the controllable range required by design, and the size of top cover assembly meets the assembly requirements of small-size battery.

Description

Technical Field

[0001] This utility model relates to the field of electrical equipment technology, specifically to a top cover assembly, a battery, and electrical equipment. Background Technology

[0002] In related technologies, the top cover assembly uses a pressure ring to press the elastic sealing ring. However, the pressure ring pressing the elastic sealing ring can cause it to be over-compressed, resulting in an excessively large radial dimension, even larger than the size of the cover plate. This leads to a large radial dimension of the top cover assembly, which does not meet the assembly requirements of small-sized batteries. Utility Model Content

[0003] The embodiments of this utility model provide a top cover assembly, a battery, and an electrical device, which can improve the problem that the elastic sealing ring is over-compressed when pressed by the pressure ring, resulting in the radial dimension of the elastic sealing ring being too large or even larger than the size of the cover plate, thus causing the radial dimension of the top cover assembly to be too large and not meeting the assembly requirements of small-sized batteries.

[0004] In a first aspect, embodiments of the present invention provide a top cover assembly.

[0005] In one embodiment, the top cover assembly includes:

[0006] Elastic sealing ring;

[0007] The pressure ring includes a first ring body and a second ring body connected sequentially along the axial direction of the elastic sealing ring. The outer diameter of the first ring body is larger than the outer diameter of the second ring body. The second ring body is used to abut against the elastic sealing ring so that part of the elastic sealing ring is compressed by the second ring body and the other part is expanded.

[0008] Wherein, along the axial direction of the elastic sealing ring, the distance between the expanded portion of the elastic sealing ring and the first ring body is L1, where L1≥0.

[0009] In one embodiment, 0mm ≤ L1 ≤ 3mm.

[0010] In the embodiments of this utility model, when the gap between the expanded portion of the elastic sealing ring and the first ring body is between 0mm and 3mm, it can prevent the risk of glue overflow from the elastic sealing ring, and also make the axial dimension of the top cover assembly as small as possible to meet the assembly requirements.

[0011] In one embodiment, when the elastic sealing ring is not deformed, the inner diameter of the second ring body is greater than or equal to the inner diameter of the elastic sealing ring.

[0012] In an embodiment of this utility model, when the elastic sealing ring is not deformed, the inner diameter of the second ring body is greater than or equal to the inner diameter of the elastic sealing ring, so that when the elastic sealing ring is compressed and deformed by the second pressure ring, the deformed part of the elastic sealing ring can fill the second pressure ring to improve the sealing performance between the elastic sealing ring and the second pressure ring.

[0013] In one embodiment, a cover plate is further included, the cover plate being provided with a first mounting hole;

[0014] The elastic sealing ring is fitted inside the cover plate through the first mounting hole. The elastic sealing ring includes a first sealing ring body that extends out of the first mounting hole and is located between the cover plate and the first ring body. Along the axial direction of the elastic sealing ring, the outer periphery of the projection of the first sealing ring body is within the range of the outer periphery of the projection of the cover plate.

[0015] In embodiments of this invention, this structure prevents the elastic sealing ring from overflowing from the cover plate when pressure is applied to it via the pressure ring, thus avoiding any impact on the radial dimensions of the top cover assembly along the elastic sealing ring. The design that the outer periphery of the projection of the first sealing ring body lies within the outer periphery of the projection of the cover plate along the axial direction of the elastic sealing ring helps control the stability of the elastic sealing ring's diameter after compression.

[0016] In one embodiment, along the axial direction of the elastic sealing ring 1, the thickness of the first sealing ring before deformation is H1, the thickness of the first sealing ring after expansion is H2, and the thickness of the first sealing ring after being compressed by the second ring is H3.

[0017] The second ring body includes a first sub-ring body and a second sub-ring body connected sequentially along the axial direction of the elastic sealing ring. The end of the first sub-ring body away from the second sub-ring body is connected to the first ring body. The outer diameter of the first sub-ring body is larger than the outer diameter of the second sub-ring body. Both the first and second sub-ring bodies are used to abut against the elastic sealing ring. The thickness of the first sub-ring body is H4; wherein, H2≤H4+H3 <H4+H1。

[0018] In the embodiments of this utility model, the thickness of the compression ring and the thickness of the elastic sealing ring are made to have a certain difference along the axial direction of the elastic sealing ring, so that the difference in the compression ratio of the elastic sealing ring is sufficient to achieve the effect of suppressing the expansion of the elastic sealing ring in the thickness direction.

[0019] In one embodiment, along the axial direction of the elastic sealing ring, the outer periphery of the projection of the pressure ring is within the range of the outer periphery of the projection of the first sealing ring body.

[0020] In embodiments of this invention, this structure effectively limits adhesive overflow from the elastic sealing ring when pressure is applied to it via the pressure ring, thus limiting its impact on the radial dimensions of the top cover assembly along the elastic sealing ring and helping to stabilize the diameter of the elastic sealing ring after compression. Furthermore, this design also prevents the pressure ring from contacting the cover plate, which could lead to a short circuit in the battery.

[0021] In one embodiment, the resilient sealing ring further includes a second sealing ring body that extends out of the first mounting hole and abuts against the side of the cover plate opposite to the pressure ring;

[0022] The top cover assembly also includes an electrode post, which includes a base and a column connected to the base. The base abuts against the side of the second sealing ring opposite to the cover plate, and the end of the column away from the base passes through the elastic sealing ring and is sleeved with the pressure ring.

[0023] In this embodiment of the invention, this design allows the second sealing ring to seal the gap between the cover plate and the base. The end of the post furthest from the base passes through the elastic sealing ring and engages with the pressure ring. This achieves the limiting and fixing of the post in the axial direction of the elastic sealing ring, and the operation is simple.

[0024] In one embodiment, the base has a protrusion on one side facing the second sealing ring, and the protrusion elastically abuts against the second sealing ring.

[0025] In embodiments of this invention, the protrusion can locally increase the compression ratio of the elastic sealing ring, making the compression ratio of the area where the elastic sealing ring contacts the protrusion greater than the compression ratio of the area where it does not contact the protrusion. Because the elastic sealing ring has areas with relatively low compression, the radial expansion of the elastic sealing ring can be reduced, thus decreasing the radial dimension of the top cover assembly. When this top cover assembly is assembled with the housing, its impact on the outer diameter of small-diameter batteries can also be reduced.

[0026] In one embodiment, the boss extends circumferentially along the elastic sealing ring.

[0027] In this embodiment of the invention, the boss is arranged in a ring shape. When the ring-shaped boss contacts the second sealing ring, it can form a ring-shaped sealing pressure band in the contact area, thereby greatly improving the sealing performance between the second sealing ring and the base. In addition, the ring-shaped boss ensures that the expansion suppression effect is the same in all circumferential directions of the second sealing ring when the elastic sealing ring is compressed, reducing the radial dimension of the top cover assembly in the elastic sealing ring and improving the aesthetics of the top cover assembly.

[0028] In one embodiment, the boss has an abutment surface disposed away from the base, the abutment surface being at least partially configured as an arcuate surface protruding toward the second sealing ring body.

[0029] In embodiments of this invention, when the second sealing ring abuts against the boss, the abutment surface with its arcuate curve has a guiding effect, which can better guide the deformation of the second sealing ring. The abutment surface with its arcuate curve can evenly distribute stress, reduce stress concentration, and delay the initiation and propagation of fatigue cracks in the second sealing ring. This can improve the fatigue resistance of the second sealing ring, extend its service life, and reduce the problem of sealing failure of the second sealing ring due to fatigue damage.

[0030] Secondly, embodiments of the present invention provide a battery, comprising:

[0031] The housing has a second mounting hole on its top.

[0032] The battery cell is installed inside the housing;

[0033] As described above, the top cover assembly covers the second mounting hole and is connected to the housing.

[0034] In one embodiment, the top cover assembly further includes a cover plate having a first mounting hole, the elastic sealing ring being fitted inside the cover plate through the first mounting hole, the cover plate including a first plate, a second plate and a third plate sequentially connected along the axial direction of the elastic sealing ring, the cross-sectional areas of the first plate, the second plate and the third plate decreasing from the top to the bottom of the housing, and the periphery of the second plate abutting against the sidewall of the second mounting hole.

[0035] In this embodiment of the invention, because the cross-sectional area of ​​the third plate is smaller than that of the second plate, the third plate has a guiding function, facilitating the assembly and connection of the cover plate with the second mounting hole. Furthermore, because the cross-sectional area of ​​the first plate is larger than that of the second plate, during installation, the first plate can abut against the periphery of the second mounting hole, achieving axial positioning of the cover plate along the elastic sealing ring.

[0036] In one embodiment, the thickness of the housing is T;

[0037] Along the radial direction of the elastic sealing ring, the second plate has a dimension of L2, and the third plate has a dimension of L3, wherein L2-L3>0.1*T.

[0038] In embodiments of this invention, when L2-L3>0.1*T, the second and third plates exhibit a significant radial dimensional difference, forming a stepped structure. When the cover plate is installed onto the housing, the larger radial dimension of the second plate allows it to engage with the sidewall of the second mounting hole in the housing. This engagement enables the second plate to be embedded into the housing. This interlocking design, through physical interlocking, resists external forces and maintains a tight connection between the housing and the cover plate. Furthermore, L2-L3>0.1*T can reduce the battery diameter and increase the battery's energy density.

[0039] Thirdly, embodiments of this utility model provide an electrical device, including the battery as described above.

[0040] The beneficial effects of the embodiments of this utility model are as follows:

[0041] In this embodiment of the invention, the second ring directly abuts against the elastic sealing ring and applies pressure, defining a reference dimension of the elastic sealing ring in the radial direction. The design that the distance between the expanded portion of the elastic sealing ring and the first ring is greater than or equal to zero sets a clear boundary for the expansion of the elastic sealing ring. When the elastic sealing ring deforms under pressure, the other part of the elastic sealing ring can only expand along its axial direction, avoiding the problem of excessive overflow along the radial direction of the elastic sealing ring leading to a large radial dimension of the top cover assembly, ensuring that the size of the top cover assembly meets the assembly requirements of small-sized batteries. The structure of the partially compressed and partially expanded elastic sealing ring forms multiple sealing lines. The compressed portion ensures a tight fit between the elastic sealing ring and the contact surface, providing a basic sealing effect; the expanded portion can further fill any possible tiny gaps, forming a secondary seal, greatly improving the reliability of the top cover assembly seal. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the top cover assembly provided in an embodiment of the present invention;

[0045] Figure 3 This is a schematic diagram of the structure of the elastic sealing ring installed on the cover plate according to an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of the pressure ring provided in an embodiment of this utility model;

[0047] Figure 5 This is a schematic diagram of the structure of the cover plate provided in an embodiment of this utility model;

[0048] Figure 6 This is a schematic diagram of the structure of the bottom cover provided in an embodiment of this utility model.

[0049] Explanation of reference numerals in the attached figures:

[0050] 100. Battery; 10. Top cover assembly; 1. Elastic sealing ring; 11. First sealing ring body; 12. Second sealing ring body; 2. Pressure ring; 21. First ring body; 22. Second ring body; 221. First sub-ring body; 222. Second sub-ring body; 3. Cover plate; 31. First mounting hole; 311. First hole segment; 312. Second hole segment; 32. First plate body; 33. Second plate body; 34. Third plate body; 4. Terminal post; 41. Base; 411. Boss; 42. Column body; 201. Cylindrical body; 202. Bottom cover; 2021. First bottom; 2022. Second bottom; 2023. Third bottom; 30. Battery cell; 301. Positive electrode plate; 302. Negative electrode plate; 303. Separator; 304. Positive electrode tab; 305. Negative electrode tab. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0052] In related technologies, the top cover assembly uses a pressure ring to press the elastic sealing ring. However, the pressure ring pressing the elastic sealing ring can cause it to be over-compressed, resulting in an excessively large radial dimension, even larger than the size of the cover plate. This leads to a large radial dimension of the top cover assembly, which does not meet the assembly requirements of small-sized batteries.

[0053] It should be noted that small-sized batteries refer to batteries with a diameter of less than 5mm, which can be used for screen styluses. Of course, in other embodiments, the devices using small-sized batteries can be selected as needed.

[0054] In view of this, the present invention proposes an electrical device, referring to... Figure 1 The electrical equipment includes a battery 100, which includes a housing, a battery cell 30, and a top cover assembly 10. The top of the housing is provided with a second mounting hole, the battery cell 30 is installed inside the housing, and the top cover assembly 10 is placed over the second mounting hole and connected to the housing.

[0055] It should be noted that the electrical equipment can be vehicles, energy storage power supplies, consumer electronics, medical equipment, smart cities, mobile phones, or tablets, etc. Specifically, this application does not limit this.

[0056] Furthermore, the shape of the shell can be selected as needed. For example, the shell can be cylindrical, cuboid, cube, or other shapes; specifically, this application does not limit this. Additionally, the material of the shell can be selected as needed. For example, the shell material can be one or more combinations of metallic materials such as stainless steel, copper, iron, and aluminum alloy, or other conductive non-metallic materials. Specifically, this application does not limit this. The forming process of the shell includes, but is not limited to, material forming processes such as stamping, turning, and cutting.

[0057] Reference Figures 2 to 4 The top cover assembly 10 includes an elastic sealing ring 1 and a pressure ring 2. The pressure ring 2 includes a first ring body 21 and a second ring body 22 connected sequentially along the axial direction of the elastic sealing ring 1. The outer diameter of the first ring body 21 is larger than the outer diameter of the second ring body 22. The second ring body 22 is used to abut against the elastic sealing ring 1 so that a portion of the elastic sealing ring 1 is compressed by the second ring body 22, while the other portion is expanded. Along the axial direction of the elastic sealing ring 1, the expanded portion of the elastic sealing ring 1 is spaced apart from the first ring body 21.

[0058] In this embodiment of the invention, the second ring 22 directly abuts against the elastic sealing ring 1 and applies pressure, thus defining a reference dimension of the elastic sealing ring 1 in the radial direction. The design that the distance between the expanded portion of the elastic sealing ring 1 and the first ring 21 is greater than or equal to zero sets a clear boundary for the expansion of the elastic sealing ring 1. When the elastic sealing ring 1 deforms under pressure, the other part of the elastic sealing ring 1 can only expand along its axial direction, avoiding the problem of excessive overflow along the radial direction of the elastic sealing ring 1 leading to a large radial dimension of the top cover assembly 10, ensuring that the size of the top cover assembly 10 meets the assembly requirements of the small-sized battery 100. The partially compressed and partially expanded structure of the elastic sealing ring 1 forms multiple sealing lines. The compressed portion ensures that the elastic sealing ring 1 fits tightly against the contact surface, providing a basic sealing effect; the expanded portion can further fill any possible tiny gaps, forming a secondary seal, greatly improving the sealing reliability of the top cover assembly 10.

[0059] It should be noted that when the distance between the expanded portion of the elastic sealing ring 1 and the first ring body 21 is zero, it indicates that the expanded portion is in contact with the first ring body 21. When the distance between the expanded portion of the elastic sealing ring 1 and the first ring body 21 is greater than zero, it indicates that the expanded portion of the elastic sealing ring 1 is located on the side of the first ring body 21 facing the second ring body 22 and is spaced apart from the first ring body 21. When the distance between the expanded portion of the elastic sealing ring 1 and the first ring body 21 is less than zero, it indicates that the expanded portion of the elastic sealing ring 1 extends to the outer periphery of the first ring body, that is, the elastic sealing ring 1 overflows the first ring body 21 in its radial direction, resulting in uncontrollable size of the elastic sealing ring 1. When the elastic sealing ring 1 overflows, the expanded elastic sealing ring 1 may even protrude from the pressure ring 2, resulting in unevenness on the upper surface of the top cover assembly 10, affecting the driving height of the top cover assembly 10 and the assembly effect of the top cover assembly 10.

[0060] Reference Figure 2 In one embodiment, 0mm ≤ L1 ≤ 3mm. Thus, when the distance between the expanded portion of the elastic sealing ring 1 and the first ring body 21 is between 0mm and 3mm, it can prevent the risk of adhesive overflow from the elastic sealing ring 1, and also minimize the axial dimension of the top cover assembly 10 to meet assembly requirements. When the distance between the expanded portion of the elastic sealing ring 1 and the first ring body 21 is greater than 3mm, although the risk of adhesive overflow from the elastic sealing ring 1 can be prevented, the axial dimension of the top cover assembly 10 will be larger, failing to meet assembly requirements.

[0061] It should be noted that the interval between the expanded portion of the elastic sealing ring 1 and the first ring body 21 can be selected as needed. For example, the interval between the expanded portion of the elastic sealing ring 1 and the first ring body 21 can be 0.05 mm, 0.1 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.24 mm, 0.25 mm, 0.29 mm, 0.3 mm, 0.35 mm, 0.38 mm, 0.4 mm, 0.44 mm, 0.48 mm, 0.5 mm, 0.54 mm, 0.55 mm, 0.58 mm, 0.6 mm, 0.65 mm, 0.75 mm, 0.8 mm, 0.9 mm, 0.98 mm, 1 mm, 1.18 mm, 1.3 mm, 1.5 mm, 2 mm, 2.29 mm, 2.3 mm, 2.5 mm, 2.8 mm, 2.94 mm or 3 mm, etc. Specifically, the present application does not limit this.

[0062] In one embodiment, when the elastic sealing ring 1 is not deformed, the inner diameter of the second ring body 22 is greater than or equal to the inner diameter of the elastic sealing ring 1. Thus, when the elastic sealing ring 1 is deformed by the second compression ring 2, the deformable part of the elastic sealing ring 1 can fill the second compression ring 2 to improve the sealing performance between the elastic sealing ring 1 and the second compression ring 2.

[0063] In one embodiment, the compression ratio of the elastic sealing ring 1 is CR, where 0% < CR ≤ 70%. Thus, controlling the compression ratio between 0% - 70% can ensure that the elastic sealing ring 1 has sufficient deformation to improve the sealing effect of the top cover assembly 10. In addition, a compression ratio of 0% < CR ≤ 70% enables the elastic sealing ring 1 to achieve a balance between sealing performance and wear, reducing the wear of the elastic sealing ring 1 and extending its service life. When the compression ratio is between 0% - 70%, the elastic sealing ring 1 has certain elasticity and flexibility and can be deformed relatively easily during installation, reducing the installation difficulty and time.

[0064] If the compression ratio is greater than 70%, the elastic sealing ring 1 may be too hard to be installed, and even damaged during installation. In addition, if the compression ratio exceeds 70%, the elastic sealing ring will be excessively squeezed, resulting in damage to its internal structure and accelerating the aging and fatigue of the material. When in an over-compressed state for a long time, the elastic sealing ring 1 may have problems such as cracks, deformation or even fracture, thus shortening its service life.

[0065] Refer to Figures 2 to 4, in one embodiment, along the axial direction of the elastic sealing ring 1, before deformation, the thickness of the first sealing ring body 11 is H1, after expansion, the thickness of the first sealing ring body 11 is H2, after being compressed by the second ring body 22, the thickness of the first sealing ring body 11 is H3, and the thickness of the first split ring body 221 is H4. The second ring body 22 includes a first split ring body 221 and a second split ring body 222 which are sequentially connected and arranged along the axial direction of the elastic sealing ring 1. One end of the first split ring body 221 far from the second split ring body 222 is connected to the first ring body 21. The outer diameter of the first split ring body 221 is greater than the outer diameter of the second split ring body 222. Both the first split ring body 221 and the second split ring body 222 are used to abut against the elastic sealing ring 1, and the thickness of the first split ring body 221 is H4. Among them, H2 < H4 + H3 < H4 + H1. In this way, along the axial direction of the elastic sealing ring 1, there is a certain difference between the thickness of the pressure ring 2 and the thickness of the elastic sealing ring 1, so that the difference in the compression ratio of the elastic sealing ring 1 is sufficient to obtain the effect of suppressing the expansion of the elastic sealing ring 1 in the thickness direction.

[0066] In one embodiment, along the direction from the first split ring body 221 to the second split ring body 222, the side walls of the second split ring body 222 are all arranged in a reduced manner. In this way, the second pressure ring 2 and the elastic sealing ring 1 are sealed and assembled, and the operation is simple.

[0067] It should be noted that in other embodiments, the second ring body 22 may further include a third split ring body, a fourth split ring body or more other split ring bodies. Specifically, the present application does not limit this. When there are more split ring bodies, the sealing performance of the elastic sealing ring 1 can be greatly improved.

[0068] Refer to Figure 5 , in one embodiment, the top cover assembly 10 further includes a cover plate 3. The cover plate 3 is provided with a first mounting hole 31. The elastic sealing ring 1 is sleeved on the cover plate 3 through the first mounting hole 31. The elastic sealing ring 1 includes a first sealing ring body 11 that extends out of the first mounting hole 31 and is between the cover plate 3 and the first ring body 21, so as to realize that the first sealing ring body 11 can seal the gap between the pressure ring 2 and the cover plate 3. Along the axial direction of the elastic sealing ring 1, the outer peripheral edge of the projection of the first sealing ring body 11 is within the range of the outer peripheral edge of the projection of the cover plate 3. In this way, this structure can prevent the elastic sealing ring 1 from overflowing the cover plate 3 when pressure is applied to the elastic sealing ring 1 through the pressure ring 2, thereby affecting the size of the top cover assembly 10 along the radial direction of the elastic sealing ring 1. Along the axial direction of the elastic sealing ring 1, the design that the outer peripheral edge of the projection of the first sealing ring body 11 is within the range of the outer peripheral edge of the projection of the cover plate 3 helps to control the stability of the diameter size of the elastic sealing ring 1 after being compressed.

[0069] In one embodiment, along the axial direction of the elastic sealing ring 1, the outer periphery of the projection of the pressure ring 2 is within the range of the outer periphery of the projection of the elastic sealing ring 1. This structure effectively limits the overflow of adhesive from the elastic sealing ring 1 when pressure is applied to it via the pressure ring 2, thus limiting its impact on the radial dimension of the top cover assembly 10 along the elastic sealing ring 1 and helping to control the stability of the diameter of the elastic sealing ring 1 after compression. Furthermore, this design also prevents the pressure ring 2 from contacting the cover plate 3, thereby avoiding a short circuit in the battery 100.

[0070] In one embodiment, the elastic sealing ring 1 further includes a second sealing ring body 12 extending out of the first mounting hole 31 and abutting against the side of the cover plate 3 opposite to the pressure ring 2. The top cover assembly 10 also includes a pole post 4, which includes a base 41 and a column 42 connected to the base 41. The base 41 abuts against the side of the second sealing ring body 12 opposite to the cover plate 3. Thus, the second sealing ring body 12 can seal the gap between the cover plate 3 and the base 41. The end of the column 42 away from the base 41 passes through the elastic sealing ring 1 and is sleeved with the pressure ring 2. This achieves the limiting and fixing of the pole post 4 in the axial direction of the elastic sealing ring 1, and the operation is simple.

[0071] Reference Figure 2 In one embodiment, a boss 411 protrudes from the base 41 toward the side facing the second sealing ring 12. Thus, the boss 411 locally increases the compression ratio of the elastic sealing ring 1, making the compression ratio of the area where the elastic sealing ring 1 contacts the boss 411 greater than the compression ratio of the area not in contact with the boss 411. Because the elastic sealing ring 1 has areas with relatively small compression, the radial expansion of the elastic sealing ring 1 can be reduced, thereby reducing the radial dimension of the top cover assembly 10 relative to the elastic sealing ring 1. When the top cover assembly 10 is assembled with the housing, the influence of the top cover assembly 10 on the outer diameter of the small-diameter battery 100 can also be reduced.

[0072] It should be noted that the processing method of the boss 411 can be stamping, turning, welding, etc., but this application does not limit it in this respect.

[0073] In one embodiment, the boss 411 extends circumferentially along the elastic sealing ring 1. Thus, the boss 411 is annularly arranged, and when it contacts the second sealing ring 12, it forms an annular sealing pressure band in the contact area, thereby greatly improving the sealing performance between the second sealing ring 12 and the base 41. Furthermore, the annular boss 411 ensures that when the elastic sealing ring 1 is compressed, the expansion suppression effect is the same throughout the circumference of the second sealing ring 12, reducing the radial dimension of the top cover assembly 10 relative to the elastic sealing ring 1 and improving the aesthetics of the top cover assembly 10.

[0074] Reference Figure 2In one embodiment, the boss 411 has an abutment surface facing away from the base 41, and the abutment surface is at least partially configured as an arcuate surface protruding towards the second sealing ring 12. Thus, when the second sealing ring 12 abuts against the boss 411, the arcuate abutment surface has a guiding effect, which can better guide the deformation of the second sealing ring 12. The arcuate abutment surface can evenly distribute stress, reduce stress concentration, and delay the initiation and propagation of fatigue cracks in the second sealing ring 12. This can improve the fatigue resistance of the second sealing ring 12, extend its service life, and reduce the sealing failure of the second sealing ring 12 due to fatigue damage.

[0075] Reference Figure 5 Along the direction from the pressure ring 2 to the cover plate 3, the first mounting hole 31 of the cover plate 3 includes a first hole segment 311 and a second hole segment 312 connected in sequence. The diameter of the first hole segment 311 is D1, and the diameter of the second hole segment 312 is D2, satisfying D1 > D2. Thus, when the cover plate 3 and the pole post 4 are engaged, the cover plate 3 and the pole post 4 have different distances in the height direction at different positions. When riveting, the pole post 4 is compressed and expands. Because the cover plate 3 and the pole post 4 have different distances in the height direction, the pole post 4 has different constraint forces in the height direction when it expands, resulting in different expansion amounts in the height direction. At the position where the distance between the cover plate 3 and the pole post 4 is larger, the constraint force on the pole post 4 when it expands is smaller, and it has a larger expansion amount. Therefore, after riveting, the pole post 4 has different diameters in the height direction and matches the inner hole of the cover plate 3, which can improve the structural strength of the top cover after riveting, and can increase the pressure of the base 41 of the pole post 4 on the elastic sealing ring 1, thereby improving the sealing performance and structural reliability of the top cover assembly 10.

[0076] In the above embodiments, the materials of the cover plate 3, the electrode post 4, and the pressure ring 2 can be selected as needed. For example, the materials of the cover plate 3, the electrode post 4, and the pressure ring 2 may include one or more combinations of metallic materials such as stainless steel, copper, iron, and aluminum alloy, or other conductive non-metallic materials. Specifically, this application does not limit this.

[0077] Reference Figure 2In one embodiment, the top cover assembly 10 further includes a cover plate 3 with a first mounting hole 31. The elastic sealing ring 1 is fitted inside the cover plate 3 through the first mounting hole 31. The cover plate 3 includes a first plate 32, a second plate 33, and a third plate 34 sequentially connected along the axial direction of the elastic sealing ring 1. The cross-sectional areas of the first plate 32, the second plate 33, and the third plate 34 decrease from the top to the bottom of the housing, and the periphery of the second plate 33 abuts against the side wall of the second mounting hole. Thus, since the cross-sectional area of ​​the third plate 34 is smaller than that of the second plate 33, the third plate 34 has a guiding function, facilitating the assembly and connection of the cover plate 3 with the second mounting hole. In addition, since the cross-sectional area of ​​the first plate 32 is larger than that of the second plate 33, during installation, the first plate 32 can abut against the periphery of the second mounting hole, thereby limiting the position of the cover plate 3 along the axial direction of the elastic sealing ring 1.

[0078] Reference Figure 5 In one embodiment, along the radial direction of the elastic sealing ring 1, the second plate 33 has a dimension of L2, and the third plate 34 has a dimension of L3, where L2-L3>0.1*T. Thus, when L2-L3>0.1*T, there is a significant dimensional difference between the second plate 33 and the third plate 34 in the radial direction, forming a stepped structure. When the cover plate 3 is installed onto the housing, the larger radial dimension of the second plate 33 can cooperate with the sidewall of the second mounting hole in the housing. This cooperation allows the second plate 33 to be embedded in the housing. The interlocking design, through physical interlocking, can resist external forces and maintain a tight connection between the housing and the cover plate 3. Furthermore, L2-L3>0.1*T can also reduce the diameter of the battery 100 and increase the energy density of the battery 100.

[0079] Additionally, refer to Figure 5 A chamfer is provided at the connection between the second plate 33 and the third plate 34. Thus, the chamfer has a guiding function, and the chamfer facilitates the embedding of the second plate 33 into the shell.

[0080] Reference Figure 1 The housing also includes a cylindrical body 201 and a bottom cover 202. An opening at one end of the cylindrical body 201 forms a second mounting hole, and the bottom cover 202 covers the opening at the other end of the cylindrical body 201. (Refer to...) Figure 6 The bottom cover 202 includes a first bottom 2021, a second bottom 2022 and a third bottom 2023 connected sequentially along the axial direction of the elastic sealing ring 1. The first bottom 2021 is the exposed part of the battery cell 30 and is welded to the cylinder 201. The side wall of the second bottom 2022 is arc-shaped, which facilitates its fit and matching with the inner diameter of the cylinder 201. The third bottom 2023 is welded to the negative electrode tab 305 of the battery cell 30.

[0081] It should be noted that the material of the bottom cover 202 can be selected as needed. For example, the material of the bottom cover 202 may include one or more combinations of metallic materials such as stainless steel, copper, iron, and aluminum alloy, or other conductive non-metallic materials. Specifically, this application does not limit this. In addition, the forming process of the bottom cover 202 includes, but is not limited to, material forming processes such as stamping, turning, and cutting.

[0082] In addition, the second bottom 2022 is electrically and sealingly connected to the cylinder 201 at the mating position. The connection can be made by one or more methods, such as laser welding, argon arc welding, ultrasonic welding, and conductive adhesive. Specifically, this application does not limit this.

[0083] Reference Figure 1 The battery cell 30 includes a positive electrode 301, a negative electrode 302, a separator 303, a positive electrode tab 304, and a negative electrode tab 305. The battery cell 30 can be wound or stacked. The negative electrode tab 305 of the battery cell 30 is electrically connected to the third bottom 2023. The battery cell 30 is placed inside the housing. The positive electrode tab 304 of the battery cell 30 is electrically connected to the terminal post 4. Electrolyte is injected into the housing, and the top cover assembly 10 is fitted with the second mounting hole of the housing to seal the second mounting hole. The sealing position is welded and sealed. After charging and activation, the battery 100 forms a high-energy-density battery 100. The positive electrode tab 304 and the negative electrode tab 305 face opposite directions, and can be parallel, perpendicular, non-parallel, or non-perpendicular. The electrolyte can be a liquid electrolyte, a gel electrolyte, or a solid electrolyte.

[0084] It should be noted that the method for electrically connecting the negative electrode tab 305 and the third bottom 2023 can be selected as needed. For example, the electrical connection method between the negative electrode tab 305 and the third bottom 2023 can be one or more of laser welding, resistance welding, ultrasonic welding, etc. Specifically, this application does not limit this. The method for electrically connecting the positive electrode tab 304 of the battery cell 30 and the terminal post 4 can be selected as needed. For example, the electrical connection between the positive electrode tab 304 of the battery cell 30 and the terminal post 4 can include one or more of laser welding, resistance welding, ultrasonic welding, etc. Specifically, this application does not limit this. The top cover assembly 10 is fitted with the housing, and the fitted positions are electrically connected and sealed. The connection method here can be one or more of laser welding, argon arc welding, ultrasonic welding, conductive adhesive, etc., used in combination.

[0085] The embodiments of this utility model have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A top cover assembly, characterized in that, include: Elastic sealing ring; The pressure ring includes a first ring body and a second ring body connected sequentially along the axial direction of the elastic sealing ring. The outer diameter of the first ring body is larger than the outer diameter of the second ring body. The second ring body is used to abut against the elastic sealing ring so that part of the elastic sealing ring is compressed by the second ring body and the other part is expanded. Wherein, along the axial direction of the elastic sealing ring, the distance between the expanded portion of the elastic sealing ring and the first ring body is L1, where L1≥0.

2. The top cover assembly according to claim 1, characterized in that, 0mm≤L1≤3mm.

3. The top cover assembly according to claim 1, characterized in that, When the elastic sealing ring is not deformed, the inner diameter of the second ring body is greater than or equal to the inner diameter of the elastic sealing ring.

4. The top cover assembly according to any one of claims 1 to 3, characterized in that, It also includes a cover plate, which is provided with a first mounting hole; The elastic sealing ring is fitted inside the cover plate through the first mounting hole. The elastic sealing ring includes a first sealing ring body that extends out of the first mounting hole and is located between the cover plate and the first ring body. Along the axial direction of the elastic sealing ring, the outer periphery of the projection of the first sealing ring body is within the range of the outer periphery of the projection of the cover plate.

5. The top cover assembly according to claim 4, characterized in that, Along the axial direction of the elastic sealing ring, the thickness of the first sealing ring before deformation is H1, the thickness of the first sealing ring after expansion is H2, and the thickness of the first sealing ring after being compressed by the second ring is H3. The second ring body includes a first sub-ring body and a second sub-ring body connected sequentially along the axial direction of the elastic sealing ring. The end of the first sub-ring body away from the second sub-ring body is connected to the first ring body. The outer diameter of the first sub-ring body is larger than the outer diameter of the second sub-ring body. Both the first and second sub-ring bodies are used to abut against the elastic sealing ring. The thickness of the first sub-ring body is H4; wherein, H2≤H4+H3 <H4+H1。 6. The top cover assembly according to claim 4, characterized in that, Along the axial direction of the elastic sealing ring, the outer periphery of the projection of the pressure ring is within the range of the outer periphery of the projection of the first sealing ring body.

7. The top cover assembly according to claim 4, characterized in that, The elastic sealing ring also includes a second sealing ring body that extends out of the first mounting hole and abuts against the side of the cover plate opposite to the pressure ring; The top cover assembly also includes an electrode post, which includes a base and a column connected to the base. The base abuts against the side of the second sealing ring opposite to the cover plate, and the end of the column away from the base passes through the elastic sealing ring and is sleeved with the pressure ring.

8. The top cover assembly according to claim 7, characterized in that, The base has a protrusion on one side facing the second sealing ring, and the protrusion elastically abuts against the second sealing ring.

9. The top cover assembly according to claim 8, characterized in that, The boss extends circumferentially along the elastic sealing ring.

10. The top cover assembly according to claim 8, characterized in that, The boss has an abutment surface that is disposed away from the base, and the abutment surface is at least partially configured as an arcuate surface that protrudes toward the second sealing ring body.

11. A battery, characterized in that, include: The housing has a second mounting hole on its top. The battery cell is installed inside the housing; The top cover assembly as claimed in any one of claims 1 to 10, wherein the top cover assembly covers the second mounting hole and is connected to the housing.

12. The battery according to claim 11, characterized in that, The top cover assembly further includes a cover plate with a first mounting hole. The elastic sealing ring is fitted inside the cover plate through the first mounting hole. The cover plate includes a first plate, a second plate, and a third plate connected sequentially along the axial direction of the elastic sealing ring. The cross-sectional areas of the first plate, the second plate, and the third plate decrease from the top to the bottom of the housing. The periphery of the second plate abuts against the side wall of the second mounting hole.

13. The battery according to claim 12, characterized in that, The thickness of the shell is T; Along the radial direction of the elastic sealing ring, the second plate has a dimension of L2, and the third plate has a dimension of L3, wherein L2-L3>0.1*T.

14. An electrical appliance, characterized in that, Includes the battery as described in any one of claims 11 to 13.

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