Sealing structure and battery

Abstract

The utility model discloses a sealing structure and a battery, and relates to the technical field of lithium batteries. The sealing structure comprises a cover body, a cylinder body and a sealing ring. A sealing groove is annularly formed in one side, in the first direction, of the cover body ring; the cylinder body is buckled with the cover body along the first direction, and an accommodating space and a reserved space which are communicated with the sealing groove are formed; the sealing ring comprises a first ring part embedded in the sealing groove and a second ring part located in the containing space, and when the sealing ring deforms, the sealing ring can spread to the reserved space. By adopting the technology provided by the utility model, the deformation space of the sealing ring can be reserved, and the waterproof effect of the battery is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, in particular to a sealing structure and a battery. Background Art

[0002] Since power lithium batteries are usually installed in the bottom and trunk of electric vehicles, they are easily affected by rain, mud and other external factors. Therefore, the waterproof requirements for power lithium batteries are becoming increasingly higher. Currently, the commonly used waterproof designs are: (1) glue sealing, but it is easy to increase product weight and manufacturing costs; (2) silicone sealing between the aluminum cylinder and the upper and lower covers, but this method requires a large amount of silicone and is easy to affect production line workers and related production equipment; (3) O-type rubber sealing ring combined with aluminum cylinder, which achieves waterproof effect by squeezing the rubber ring, but the squeezed rubber ring will accelerate aging, resulting in poor waterproof effect in the later stage.

[0003] Based on this, the Chinese utility model patent (CN215299428U) discloses an aluminum cylinder sealing ring sealing structure, including an aluminum cylinder and end covers arranged on both sides of the aluminum cylinder; a sealing ring is arranged between the end cover and the aluminum cylinder, and the sealing ring includes a sealing portion that cooperates with the end of the aluminum cylinder and a pre-tightening portion that cooperates with the end cover; the end cover includes a compression rib formed on the outer periphery that cooperates with the end of the aluminum cylinder; the compression rib extends outward from the outer periphery relative to the direction of the end of the aluminum cylinder to form a compression stop; the height of the compression stop is less than the thickness of the sealing portion.

[0004] Among them, although this method limits the sealing compression of the sealing ring and ensures that the sealing ring will not be over-pressurized, it also reduces the waterproof effect of the sealing ring and does not meet the airtightness requirements of the battery. Utility Model Content

[0005] The utility model provides a sealing structure and a battery to solve the problem in the prior art that it is difficult to balance the compression amount of the sealing ring and the airtightness requirement.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is to provide a sealing structure, which includes: a cover body, a cylinder body and a sealing ring.

[0007] The cover ring is provided with a sealing groove on one side along the first direction; the cylinder is buckled with the cover along the first direction, and forms an accommodating space and a reserved space connected to the sealing groove; the sealing ring includes a first ring portion embedded in the sealing groove and a second ring portion located in the accommodating space, wherein, when the sealing ring is deformed, the sealing ring can spread to the reserved space.

[0008] The technical solution provided by this utility model has the following beneficial effects compared with the prior art:

[0009] By embedding the sealing ring between the cover and the cylinder, the sealing ring can fill the sealing groove and the accommodating space when squeezed, and respectively interference fit with the cover and the cylinder to form a sealing structure. That is, the size of the sealing ring is slightly larger than the size of the fitting part of the cover and the cylinder, and the elastic deformation of the sealing ring is relied on to achieve the sealing between the cover and the cylinder, thereby meeting the waterproof requirements of the battery.

[0010] Since the sealing ring is typically made of incompressible rubber, additional space is provided for the sealing ring. This allows deformation due to thermal expansion or other factors to flow into the space, maintaining the integrity of the seal. Furthermore, long-term compression of the sealing ring can accelerate its aging. By utilizing the aforementioned accommodation space and space, multiple surfaces of the sealing ring can maintain full contact with the cover and barrel, achieving a multi-layered waterproofing effect.

[0011] In some embodiments, the reserved space includes a first reserved space and a second reserved space, the first reserved space is located between the cover body and the cylinder along the first direction, and forms an annular notch at the outer edges of the cover body and the cylinder; the second reserved space is located between the cover body and the cylinder along the second direction, and is arranged away from the sealing groove along the first direction.

[0012] With this technical solution, the second reserved space is a vertical space. When the sealing ring deforms and extends into the first reserved space, it can form a clearance fit with the cover and the barrel, facilitating subsequent battery removal. The first reserved space is a horizontal space, located on opposite sides of the second reserved space and staggered along the first direction. When the sealing ring deforms, due to the interference fit on both sides along the first direction, it can only extend into the first and second reserved spaces, thus ensuring the sealing effect after deformation.

[0013] In some embodiments, the sealing ring includes a first snap-on portion, and the cover body is provided with a second snap-on portion corresponding one-to-one to the first snap-on portion; wherein, the first snap-on portion is circumferentially arranged on the inner side of the sealing ring, and the second snap-on portion can be snapped together with the first snap-on portion.

[0014] By adopting the above technical solution, the sealing ring is pre-installed on the cover body by providing the first snap portion and the second snap portion, so that the sealing ring will not fall off during the locking process with the cylinder body, reducing the difficulty of installing the sealing ring.

[0015] In some embodiments, the first snap-fit ​​portion includes a through slot, and the second snap-fit ​​portion includes a post that engages with the through slot in a concave-convex manner, wherein the post is capable of interference fit with the through slot. Furthermore, the through slot has a width ranging from 0.05 mm to 0.15 mm.

[0016] By adopting the above technical solution, the sealing ring and the cover body are pre-assembled in a simple manner by inserting the clamping column into the through groove and performing interference fit, and the sealing ring and the cover body can be directly pressed and fixed to the cover body.

[0017] In some embodiments, the sealing ring further comprises a plurality of locking holes, which are circumferentially arranged inside the sealing ring and spaced apart from the first buckle portion, so that the bolt can pass through the cover body and lock the sealing ring with the cylinder body.

[0018] In some embodiments, the locking hole portion is provided with a through hole that sequentially passes through the first ring portion and the second ring portion along the first direction, wherein the through hole includes a first arc portion and a second arc portion symmetrically arranged on opposite sides of the through hole.

[0019] Compared to the current circular screw hole approach, the above technical solution provides a special-shaped screw hole by providing first and second arc portions on either side of the through hole, preventing the bolt from loosening. Furthermore, the barrel is provided with arcuate grooves corresponding to the through holes, with the same curvature as the first and second arc portions. These arcuate grooves extend along a first direction and serve as reinforcement ribs for the barrel, thereby increasing its strength and rigidity without increasing its wall thickness, preventing distortion.

[0020] In some embodiments, the locking hole portion includes a through hole that sequentially passes through the first ring portion and the second ring portion along the first direction, wherein a bead is provided on the outer edge of the second ring portion along the second direction, and the through hole has a notch on the side facing the bead. The notch is provided on the side of the through hole near the bead to prevent the sealing ring from over-sealing when tightening the bolt, causing a pressure difference inside and outside the through hole, which would result in an inability to bolt the cylinder and cover.

[0021] In some embodiments, a side of the cylinder facing the sealing ring along the first direction is flat.

[0022] With this technical solution, the end surface of the barrel that contacts the cover is flat, eliminating the need for the conventional finishing steps required to seal with the sealing ring, nor the need for gluing the cover and barrel. This allows the barrel to be standardized, effectively reducing the number of barrel processing steps and saving manufacturing costs.

[0023] In some embodiments, the present application further provides a battery comprising: a cover, a barrel, and a sealing strip. The cover comprises a first cover and a second cover spaced apart along a first direction; the barrel is respectively engaged with the first cover and the second cover along the first direction.

[0024] The sealing strip includes a first sealing strip and a second sealing strip, the first sealing strip is embedded between the first cover and the cylinder along the first direction, and the second sealing strip is embedded between the second cover and the cylinder along the first direction; wherein the cylinder forms the above-mentioned sealing structure with the first cover and the first sealing strip, and the second cover and the second sealing strip respectively.

[0025] By adopting the above technical solution, by adopting the above sealing structure on both sides of the cylinder, the sealing performance of the battery can be effectively ensured, preventing foreign substances (such as moisture, dust, etc.) from entering the battery, and also preventing the gas or liquid inside the battery from leaking to the external environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Among them:

[0027] Figure 1 This is a schematic diagram of the three-dimensional structure of an embodiment of a battery provided by the present utility model;

[0028] Figure 2 This is a cross-sectional view of an embodiment of a battery provided by the present utility model;

[0029] Figure 3 yes Figure 2 A magnified view of the local structure of part A;

[0030] Figure 4 This is a schematic diagram of the three-dimensional structure of an embodiment of a sealing ring of a sealing structure provided by the utility model;

[0031] Figure 5 This is a top view of an embodiment of a sealing ring of a sealing structure provided by the utility model;

[0032] Figure 6 This is a schematic diagram of the three-dimensional structure of an embodiment of a cover body with a sealing structure provided by the present invention;

[0033] Figure 7 yes Figure 4 A magnified view of the local structure of part B;

[0034] Figure 8 This is an exploded view of an embodiment of a battery provided by the present invention.

[0035] In the picture:

[0036] 10. Cover; 11. Sealing groove; 12. Second buckle portion; 120. Clamping column; 13. First cover; 14. Second cover; 20. Cylinder; 21. Accommodating space; 22. Reserved space; 220. First reserved space; 221. Second reserved space; 23. Arc groove;

[0037] 30. Sealing ring; 31. First ring portion; 32. Second ring portion; 320. Pressure strip; 33. First buckle portion; 330. Through groove; 331. Protrusion; 34. Lock hole portion; 340. Through hole; 341. First arc portion; 342. Second arc portion; 343. Notch; 35. First sealing strip; 36. Second sealing strip. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0039] In order to facilitate the subsequent description, this application first describes the sealing structure and the specific structure of the battery. Figure 2 A first direction (Z) and a second direction (O) are defined. The first direction is the height direction of the battery when it is normally placed, such as the Z direction; the second direction is the thickness direction of the battery when it is normally placed, such as the O direction. In this application, the first direction (Z) and the second direction (O) are perpendicular to each other.

[0040] See also Figures 1 to 3 As shown, Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a battery provided by the present application is shown; Figure 2 A cross-sectional view of an embodiment of a battery provided by the present application is shown; Figure 3 Shown Figure 2 A magnified view of the local structure of part A.

[0041] In some embodiments, the sealing structure includes: a cover 10, a barrel 20, and a sealing ring 30. The cover 10 is provided with a sealing groove 11 on one side thereof along a first direction; the barrel 20 is engaged with the cover 10 along the first direction, forming an accommodating space 21 and a reserved space 22 that are connected to the sealing groove 11; the sealing ring 30 includes a first ring portion 31 embedded in the sealing groove 11 and a second ring portion 32 located in the accommodating space 21, wherein when the sealing ring 30 is deformed, the sealing ring 30 can spread to the reserved space 22.

[0042] In the embodiment of the present application, the sealing ring 30 is embedded between the cover body 10 and the cylinder body 20, and when the sealing ring 30 is squeezed, the sealing ring 30 can fill the sealing groove 11 and the accommodating space 21, and respectively interfere with the cover body 10 and the cylinder body 20 to form a sealing structure, that is, the size of the sealing ring 30 is slightly larger than the size of the fitting part of the cover body 10 and the cylinder body 20, and the elastic deformation of the sealing ring 30 is relied upon to achieve the sealing between the cover body 10 and the cylinder body 20, thereby meeting the waterproof requirements of the battery.

[0043] For example, the sealing ring 30 is made of an incompressible rubber material. The reserved space 22 is added so that when the sealing ring 30 deforms due to thermal expansion or other factors, the deformation can spread into the reserved space 22, thereby maintaining the integrity of the seal. Furthermore, long-term compression of the sealing ring 30 can easily lead to accelerated aging. The aforementioned accommodating space 21 and reserved space 22 ensure that multiple surfaces of the sealing ring 30 are in full contact with the cover 10 and the barrel 20, thereby achieving a multi-layered waterproofing effect.

[0044] Exemplarily, the cover 10 is made of plastic, and the cylinder 20 is made of metal aluminum. The above-mentioned sealing structure can effectively achieve the sealing level of IPX7, thereby meeting the airtightness requirements of the battery and balancing the compression of the sealing ring 30.

[0045] In some embodiments, combined Figure 3 As shown, the reserved space 22 includes a first reserved space 220 and a second reserved space 221. The first reserved space 220 is located between the cover body 10 and the cylinder body 20 along the first direction, and forms an annular notch 343 on the outer edges of the cover body 10 and the cylinder body 20; the second reserved space 221 is located between the cover body 10 and the cylinder body 20 along the second direction, and is arranged away from the sealing groove 11 along the first direction.

[0046] In the embodiment of the present application, the second reserved space 221 is a vertical space. When the sealing ring 30 is deformed and extends to the first reserved space 220, it can form a clearance fit with the cover 10 and the cylinder 20, facilitating the subsequent removal and reinstallation of the battery. The first reserved space 220 is a horizontal space, and it and the second reserved space 221 are located on opposite sides of the cylinder 20, such as the inside of the cylinder 20 and the outside of the cylinder 20, and are staggered along the first direction. When the sealing ring 30 is deformed, due to the interference fit on both sides along the first direction, it can only spread to the first reserved space 220 and the second reserved space 221, thereby ensuring the sealing effect after its deformation.

[0047] See also Figures 4 to 6 As shown, Figure 4 A schematic diagram of the three-dimensional structure of a sealing ring 30 of a sealing structure provided by the present application is shown; Figure 5A top view of an embodiment of a sealing ring 30 of a sealing structure provided by the present application is shown; Figure 6 A schematic three-dimensional structure diagram of an embodiment of a cover body 10 with a sealing structure provided by the present application is shown.

[0048] In some embodiments, the sealing ring 30 includes a first snap-fit ​​portion 33, and the cover body 10 is provided with a second snap-fit ​​portion 12 corresponding one-to-one to the first snap-fit ​​portion 33; wherein the first snap-fit ​​portion 33 is circumferentially arranged on the inner side of the sealing ring 30, and the second snap-fit ​​portion 12 can be snapped together with the first snap-fit ​​portion 33.

[0049] In the embodiment of the present application, the sealing ring 30 is pre-installed on the cover 10 by providing a first latch portion 33 and a second latch portion 12, thereby preventing the sealing ring 30 from falling during the locking process with the cylinder 20, thereby reducing the difficulty of installing the sealing ring 30. For example, the first latch portion 33 includes a through-slot 330, and the second latch portion 12 is provided with a latching post 120 that mates with the through-slot 330 in a concave-convex manner. The latching post 120 can form an interference fit with the through-slot 330. The latching post 120 of the cover 10 extends through the through-slot 330 of the sealing ring 30, and the width of the latching post 120 is greater than the width of the through-slot 330, allowing the sealing ring 30 to be pressed and fixed to the cover 10 in an interference fit.

[0050] In some embodiments, the width of the through groove 330 ranges from 0.05 mm to 0.15 mm. For example, when the groove width is 1 mm, the width of the clamping column 120 is slightly larger than 1 mm, and the elastic deformation of the sealing ring 30 is used to snap into the through groove 330. Figure 5 and Figure 6 As shown, the first buckle portion 33 further includes a protrusion 331 , wherein the through groove 330 is located on the protrusion 331 , and the second buckle portion 12 is provided with grooves on both sides of the clamping column 120 , so that the staff can save more effort when pre-installing the sealing strip.

[0051] See also Figure 7 As shown, Figure 7 for Figure 4 A magnified view of the local structure of part B.

[0052] In some embodiments, combined Figure 4 As shown, the sealing ring 30 further includes a plurality of locking holes 34, which are circumferentially arranged inside the sealing ring 30 and spaced apart from the first buckle portion 33. This allows the bolt to pass through the sealing ring 30 along the cover body 10 and lock it with the cylinder body 20.

[0053] In some embodiments, the locking hole portion 34 is provided with a through hole 340 that sequentially passes through the first ring portion 31 and the second ring portion 32 along the first direction, wherein the through hole 340 includes a first arc portion 341 and a second arc portion 342 symmetrically arranged on opposite sides of the through hole 340.

[0054] In the embodiment of the present application, compared with the current circular screw hole method, a first arc portion 341 and a second arc portion 342 are provided on both sides of the through hole 340 to make it a special-shaped screw hole to prevent the bolt from loosening. Figure 1 As shown, the cylinder 20 is also provided with an arc groove 23 corresponding one-to-one to the through hole 340, and the curvature of the arc groove 23 is the same as the first arc portion 341 and the second arc portion 342, so that the arc groove 23 extends along the first direction and can serve as a reinforcing rib of the cylinder 20, thereby enhancing the strength and rigidity of the cylinder 20 without increasing the thickness of the cylinder wall, and preventing the cylinder 20 from twisting and deforming.

[0055] In some embodiments, the locking hole portion 34 includes a through hole 340 that sequentially passes through the first ring portion 31 and the second ring portion 32 along the first direction. A bead 320 is provided on the outer edge of the second ring portion 32 along the second direction. The through hole 340 has a notch 343 on the side facing the bead 320. The notch 343 is provided on the side of the through hole 340 near the bead 320 to prevent excessive sealing of the sealing ring 30 when tightening the bolt, which could cause a difference in air pressure inside and outside the through hole 340 and prevent the cylinder 20 and cover 10 from being locked with the bolts.

[0056] In some embodiments, a side of the barrel 20 facing the sealing ring 30 along the first direction is flat.

[0057] In the embodiment of the present application, the end surface of the cylinder 20 that contacts the cover 10 is flat, eliminating the need for the conventional fine-machining steps of the cylinder 20 for sealing with the sealing ring 30, and eliminating the need for gluing the cover 10 and the cylinder 20. The cylinder 20 can thus be standardized, effectively reducing the number of machining steps for the cylinder 20 and saving manufacturing costs.

[0058] See also Figure 8 As shown, Figure 8 An exploded view of an embodiment of a battery provided by the present application is shown.

[0059] In some embodiments, the battery comprises: a cover 10, a barrel 20, and a sealing strip. The cover 10 comprises a first cover 13 and a second cover 14 spaced apart along a first direction; the barrel 20 is buckled with the first cover 13 and the second cover 14 respectively along the first direction.

[0060] The sealing strip includes a first sealing strip 35 and a second sealing strip 36. The first sealing strip 35 is embedded between the first cover body 13 and the cylinder body 20 along the first direction, and the second sealing strip 36 is embedded between the second cover body 14 and the cylinder body 20 along the first direction; wherein, the cylinder body 20 forms the above-mentioned sealing structure with the first cover body 13 and the first sealing strip 35, the second cover body 14 and the second sealing strip 36 respectively.

[0061] In the embodiment of the present application, by employing the aforementioned sealing structure on both sides of the barrel 20 along the first direction, the battery's sealing performance can be effectively ensured, preventing foreign matter (such as moisture, dust, etc.) from entering the battery interior, while also preventing gas or liquid within the battery from leaking into the external environment. For example, the end surfaces of the barrel 20 facing the first cover 13 and the second cover 14 are both flat.

[0062] The above description is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, should be included in the protection scope of the present invention.

Claims

1. A sealing structure, characterized in that: include: A cover body, wherein a sealing groove is provided on one side of the cover body ring along the first direction; a barrel, the barrel being engaged with the cover along the first direction and forming an accommodating space and a reserved space communicating with the sealing groove; A sealing ring, comprising a first ring portion embedded in the sealing groove and a second ring portion located in the accommodating space, wherein the sealing ring is interference fit with the cover body and the cylinder body respectively, and when the sealing ring is deformed, the sealing ring can spread along the accommodating space to the reserved space.

2. The sealing structure according to claim 1, wherein: The reserved space includes a first reserved space and a second reserved space, the first reserved space is located between the cover and the cylinder along the first direction, and forms an annular notch on the outer edges of the cover and the cylinder; The second reserved space is located between the cover body and the cylinder body along the second direction and is arranged away from the sealing groove along the first direction.

3. The sealing structure according to claim 1, wherein: The sealing ring includes a first snap-on portion, and the cover body is provided with a second snap-on portion corresponding to the first snap-on portion one-to-one; wherein the first snap-on portion is circumferentially arranged on the inner side of the sealing ring, and the second snap-on portion can be snapped together with the first snap-on portion.

4. The sealing structure according to claim 3, characterized in that: The first buckle portion includes a through slot, and the second buckle portion is provided with a clamping column that is concavely and convexly matched with the through slot, wherein the clamping column can be interference-fitted with the through slot.

5. The sealing structure according to claim 4, characterized in that: The width of the through groove is in the range of 0.05 mm to 0.15 mm.

6. The sealing structure according to any one of claims 1 to 5, characterized in that: The sealing ring further comprises a plurality of locking hole portions, which are circumferentially arranged inside the sealing ring and spaced apart from the first buckle portion.

7. The sealing structure according to claim 6, characterized in that: The locking hole portion is provided with a through hole that sequentially passes through the first ring portion and the second ring portion along the first direction, wherein the through hole includes a first arc portion and a second arc portion symmetrically arranged on opposite sides of the through hole.

8. The sealing structure according to claim 6, characterized in that: The locking hole portion includes a through hole that sequentially penetrates the first ring portion and the second ring portion along the first direction, wherein a pressure strip is protruded from the outer edge of the second ring portion along the second direction, and the through hole has a notch on the side facing the pressure strip.

9. The sealing structure according to claim 1, wherein: A side of the cylinder facing the sealing ring along the first direction is a plane.

10. A battery, characterized in that: include: A cover body, the cover body comprising a first cover body and a second cover body spaced apart along a first direction; a barrel, the barrel being buckled with the first cover and the second cover respectively along the first direction; A sealing strip, comprising a first sealing strip and a second sealing strip, wherein the first sealing strip is embedded between the first cover and the cylinder along the first direction, and the second sealing strip is embedded between the second cover and the cylinder along the first direction; The cylinder, the first cover and the first sealing strip, and the second cover and the second sealing strip respectively form the sealing structure according to any one of claims 1 to 9.

Images