Sealing assembly of cylindrical battery and cylindrical battery

Abstract

An upper cover plate is fixed on an aluminum plate, a sealing ring is provided with an annular clamping groove, a plurality of water stopping ribs are arranged on the inner surface of the clamping groove in a protruding mode, the upper cover plate and the aluminum plate are clamped in the clamping groove, and the upper cover plate and the aluminum plate are fixed on the sealing ring. The upper cover plate and / or the aluminum plate abut against the inner surface of the clamping groove and extrude the water stop rib, the upper cover plate, the aluminum plate and the sealing ring are arranged at the open end of the shell, the outer surface of the sealing ring abuts against the shell, and the water stop rib can prevent electrolyte from seeping out of the surface, making contact with the sealing ring, of the upper cover plate and / or the aluminum plate. The upper cover plate and / or the aluminum plate extrudes the water stop rib after being assembled, the water stop rib has certain restoring force after being stressed and compressed, the restoring force can enable the connection among the upper cover plate, the aluminum plate and the shell to be tighter, the sealing performance of the inner space of the shell can be guaranteed, the sealing is reliable, and the safety of a product is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a sealing assembly for a cylindrical battery and a cylindrical battery.

Background Art

[0002] In order to prevent air, moisture, etc. from entering the battery and at the same time prevent the electrolyte inside the battery from leaking out, it is necessary to keep the inside of the battery in a sealed environment. After the existing battery structures are encapsulated, the sealing effects are uneven.

[0003] In view of this, it is necessary to provide a new sealing assembly for a cylindrical battery and a cylindrical battery to overcome the above defects.

Summary of the Utility Model

[0004] The purpose of the utility model is to provide a sealing assembly for a cylindrical battery and a cylindrical battery to solve the above technical problems.

[0005] To achieve the above purpose, in a first aspect, the utility model provides a sealing assembly for a cylindrical battery, including a housing, an aluminum plate, an upper cover plate and a sealing ring; one end of the housing is open, the upper cover plate is fixed on the aluminum plate, the sealing ring is provided with an annular card slot, and a plurality of water-stop ribs are convexly provided on the inner surface of the card slot. The upper cover plate and the aluminum plate are clamped in the card slot, the upper cover plate and / or the aluminum plate abut against the inner surface of the card slot and squeeze the water-stop ribs. The upper cover plate, the aluminum plate and the sealing ring are arranged at the open end of the housing, and the outer surface of the sealing ring abuts against the housing.

[0006] In a preferred embodiment, the sealing ring includes a parallel top wall, a bottom wall and a side wall connecting the top wall and the bottom wall. The top wall, the side wall and the bottom wall enclose the card slot, and the aluminum plate and the upper cover plate are clamped between the top wall and the bottom wall.

[0007] In a preferred embodiment, the water-stop rib includes a lower water-stop rib, and the bottom wall protrudes towards the top wall to form the lower water-stop rib. The aluminum plate abuts against the bottom wall and squeezes the lower water-stop rib.

[0008] In a preferred embodiment, the water-stop rib includes a side water-stop rib, and the side wall protrudes towards the center of the sealing ring to form the side water-stop rib.

[0009] In a preferred embodiment, the edge of the aluminum plate extends and bends towards the upper cover plate to form a wrapped edge. The wrapped edge is fixed on the upper cover plate. The wrapped edge abuts against the top wall and the side wall, and the wrapped edge squeezes the side water-stop rib.

[0010] In a preferred embodiment, one end of the bottom wall near the center of the sealing ring further extends away from the top wall to form a bottom water stop rib.

[0011] In a preferred embodiment, explosion-proof score lines are provided on the surface of the aluminum plate away from the upper cover plate.

[0012] In a preferred embodiment, a rolling groove is roll-pressed at a position of the housing near the opening end, and the aluminum plate, the upper cover plate, and the sealing ring are located above the rolling groove.

[0013] In a preferred embodiment, a through hole is provided at the center of the aluminum plate, and a convex cap is provided at the center of the upper cover plate, and the through hole and the convex cap are relatively positioned.

[0014] In a second aspect, the present invention provides a cylindrical battery, including the sealing assembly of the cylindrical battery according to any one of the above first aspects.

[0015] Compared with the prior art, for the sealing assembly of the cylindrical battery and the cylindrical battery provided by the present invention, the upper cover plate is fixed on the aluminum plate, the sealing ring is provided with an annular card slot, and a plurality of water stop ribs are convexly provided on the inner surface of the card slot. The upper cover plate and the aluminum plate are clamped in the card slot, the upper cover plate and / or the aluminum plate abut against the inner surface of the card slot and squeeze the water stop ribs. The upper cover plate, the aluminum plate, and the sealing ring are arranged at one end of the opening of the housing, and the outer surface of the sealing ring abuts against the housing. The water stop ribs can prevent the electrolyte from leaking out from the surface where the upper cover plate and / or the aluminum plate contact the sealing ring. After the upper cover plate and / or the aluminum plate are assembled, they squeeze the water stop ribs. After the water stop ribs are compressed by force, they have a certain restoring force, and the restoring force can make the connection between the upper cover plate, the aluminum plate and the housing tighter, ensure the sealing of the internal space of the housing, be reliably sealed, and ensure the safety of the product.

Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a structural diagram of the cylindrical battery provided by the present invention;

[0018] Figure 2 It is a structural diagram of the sealing assembly of the cylindrical battery provided by the present invention;

[0019] Figure 3 ForFigure 2 An enlarged view of part A

[0020] Figure 4 A structural diagram of a sealing ring in a sealing assembly of a cylindrical battery provided by an embodiment of the present invention

[0021] Figure 5 An exploded structural diagram of a sealing assembly of a cylindrical battery provided by the present invention

[0022] Figure 6 A structural diagram of a sealing ring in a sealing assembly of a cylindrical battery provided by another embodiment of the present invention

Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Usually, the components of the embodiments of the present invention described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but only represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0024] Please refer to Figure 1 , which is a structural diagram of a cylindrical battery 200 provided by the present invention. The cylindrical battery 200 provided by the present invention includes a sealing assembly 100. The sealing structure of the present invention can prevent the electrolyte from leaking out, is reliable in sealing, and ensures the safety of the product.

[0025] Please refer to Figures 2 to 4 , the sealing assembly 100 includes a housing 10, an aluminum plate 20, an upper cover plate 30, and a sealing ring 40. Specifically, one end of the housing 10 is open, the upper cover plate 30 is fixed on the aluminum plate 20, the sealing ring 40 is provided with an annular card slot 401, and a plurality of water-stop ribs 41 are convexly provided on the inner surface of the card slot 401. The upper cover plate 30 and the aluminum plate 20 are clamped in the card slot 401, the upper cover plate 30 and / or the aluminum plate 20 abut against the inner surface of the card slot 401 and squeeze the water-stop ribs 41. The upper cover plate 30, the aluminum plate 20, and the sealing ring 40 are arranged at the open end of the housing 10, and the outer surface of the sealing ring 40 abuts against the housing.

[0026] Understandably, the sealing ring 40 can specifically be a rubber ring with a certain elasticity. The upper cover plate 30 and the aluminum plate 20 are clamped in the clamping groove 401. The upper cover plate 30 and / or the aluminum plate 20 abut against the inner surface of the clamping groove 401 and extrude the water-stop ribs 41. The water-stop ribs 41 can prevent the electrolyte from leaking out from the surface where the upper cover plate 30 and / or the aluminum plate 20 contact the sealing ring 40. After the upper cover plate 30 and / or the aluminum plate 20 are assembled, they extrude the water-stop ribs 41. After the water-stop ribs 41 are compressed by force, they have a certain restoring force. The restoring force can make the connection between the upper cover plate 30, the aluminum plate 20 and the housing 10 tighter, ensure the sealing of the internal space of the housing 10, be reliably sealed, and ensure the safety of the product.

[0027] For the sealing assembly 100 of the cylindrical battery provided by the present utility model, the upper cover plate 30 is fixed on the aluminum plate 20. The sealing ring 40 is provided with an annular clamping groove 401. A plurality of water-stop ribs 41 are convexly provided on the inner surface of the clamping groove 401. The upper cover plate 30 and the aluminum plate 20 are clamped in the clamping groove 401. The upper cover plate 30 and / or the aluminum plate 20 abut against the inner surface of the clamping groove 401 and extrude the water-stop ribs 41. The upper cover plate 30, the aluminum plate 20 and the sealing ring 40 are arranged at one end of the opening of the housing 10. The outer surface of the sealing ring 40 abuts against the housing. The water-stop ribs 41 can prevent the electrolyte from leaking out from the surface where the upper cover plate 30 and / or the aluminum plate 20 contact the sealing ring 40. After the upper cover plate 30 and / or the aluminum plate 20 are assembled, they extrude the water-stop ribs 41. After the water-stop ribs 41 are compressed by force, they have a certain restoring force. The restoring force can make the connection between the upper cover plate 30, the aluminum plate 20 and the housing 10 tighter, ensure the sealing of the internal space of the housing 10, be reliably sealed, and ensure the safety of the product.

[0028] Please refer to Figure 5 simultaneously. The housing 10 is a cylindrical steel shell. The housing 10 has a receiving space. The housing 10 includes a bottom surface and an outer peripheral surface connecting the bottom surface. The bottom surface and the outer peripheral surface enclose the receiving space. The receiving space houses the battery cell 101. Specifically, one end of the housing 10 away from the bottom surface is open. The sealing assembly 100 is arranged at the open end of the housing 10 to seal the receiving space. Specifically, a rolling groove 110 is rolled at a position of the housing near the open end. The aluminum plate 20, the upper cover plate 30 and the sealing ring 40 are located above the rolling groove 110. The rolling groove 110 can extrude the sealing ring 40 to ensure the sealing performance.

[0029] The battery cell 101 is cylindrical. The battery cell 101 can specifically be formed by winding the electrode plates. The battery cell 101 includes a positive electrode end face and a negative electrode end face opposite to the positive electrode end face. The negative electrode end face of the battery cell is welded to the negative current collector plate 102 to lead out the negative electrode of the lithium-ion battery. The positive electrode end face of the battery cell is welded to the positive current collector plate 103 to lead out the positive electrode of the lithium-ion battery.

[0030] Specifically, the negative collector disc 102 is a circular sheet structure, and the negative collector disc is used to conduct the negative terminal surface of the battery cell (for example, the negative terminal ear on the negative terminal surface) and the shell 10. A welding boss is provided at the center of the negative collector disc, and the welding boss is used to be welded and fixed to the shell 10. The negative collector disc 102 is provided with a plurality of reinforcing ribs, and the plurality of reinforcing ribs are arranged along the radial direction of the negative collector disc, and the plurality of reinforcing ribs are arranged around the welding boss. The reinforcing ribs can strengthen the overall strength of the negative collector disc, and prevent the collector disc from being squeezed and deformed by external force when the collector disc is grabbed during the production process.

[0031] In this embodiment, there are four reinforcing ribs, which are symmetrically arranged. Laser slotting lines are arranged on both sides of the reinforcing ribs. The laser slotting lines create a pullable space inside and outside the slotting lines. When the battery cell is subjected to a certain vibration during actual use, the welding position will not become unsoldered and fail. At the same time, the reinforcement ribs can increase the elastic coefficient inside and outside the slotting lines. Several positioning grooves are also provided on the edge of the negative collector plate 102. The positioning grooves facilitate the positioning of incoming materials and facilitate automated production. The number of positioning grooves is specifically four, and the shape of the positioning grooves is specifically semicircular.

[0032] The positive collector disk 103 is a circular sheet structure. The positive collector disk 103 is used to conduct the positive terminal surface of the battery cell (for example, the positive ear on the positive terminal surface) and the positive electrode column 50. One end of the positive electrode column 50 is welded to the positive collector disk 103, and the other end of the positive electrode column 50 is welded to the aluminum plate 20. Specifically, a first through hole 1031 is opened at the center of the positive collector disk. The positive collector disk includes a welding area surrounding the first through hole, and the positive electrode column 50 is welded in the welding area. A plurality of reinforcing ribs are arranged on the positive collector disk. The plurality of reinforcing ribs are arranged along the radial direction of the positive collector disk. One end of the plurality of reinforcing ribs close to the center of the positive collector disk abuts against the positive electrode column. The reinforcing ribs are arranged at a position outside the welding area. The reinforcing ribs are conducive to positioning the positive electrode column during welding, and can also strengthen the overall strength of the positive collector disk to prevent the collector disk from being squeezed and deformed by external force when the collector disk is grabbed during the production process.

[0033] In this embodiment, there are four reinforcing ribs, which are symmetrically arranged. Laser slotting lines are arranged on both sides of the reinforcing ribs. The laser slotting lines create a pullable space inside and outside the slotting lines. When the battery cell is subjected to a certain vibration during actual use, the welding position will not become unsoldered and fail. At the same time, the reinforcement ribs can increase the elastic coefficient inside and outside the slotting lines. Several positioning grooves are also arranged on the edge of the positive collector plate 103. The positioning grooves facilitate the positioning of incoming materials and facilitate automated production. The number of positioning grooves is specifically four, and the shape of the positioning grooves is specifically semicircular.

[0034] The positive electrode post 50 is generally cylindrical. A through second through hole 501 is provided in the positive electrode post 50. The second through hole 501 is located at the central position of the positive electrode post. The positive electrode post 50 is located between the positive current collector plate 103 and the aluminum plate 20. The positive electrode post 50 is used to conduct the positive current collector plate 103 and the aluminum plate 20.

[0035] In some embodiments, a liquid injection hole is provided at one end of the positive electrode post 50 close to the aluminum plate 20. The liquid injection hole is communicated with the second through hole 501. The diameter of the liquid injection hole gradually decreases in the direction away from the aluminum plate 20, that is, the liquid injection hole is a conical liquid injection hole, which is convenient for the automatic liquid injection nozzle of the equipment to be aligned, and is convenient for the plugging and unplugging actions of the liquid injection and formation processes. The liquid injection hole and the second through hole also play a role in exhausting gas after formation.

[0036] Further, a welding ring groove is provided at one end of the positive electrode post 50 close to the aluminum plate 20. The welding ring groove surrounds the liquid injection hole. The aluminum plate 20 is welded in the welding ring groove. Welding the aluminum plate 20 in the welding ring groove can increase the welding area between the aluminum plate 20 and the positive electrode post 50, making the welding more firm and enhancing the structural stability. In some embodiments, an annular welding wire is further provided at one end of the positive electrode post 50 away from the aluminum plate 20. The welding wire forms a protrusion on the end surface of the positive electrode post 50, which is beneficial to accurately welding the welding wire to the welding area of the positive current collector plate 103.

[0037] The aluminum plate 20 is in a circular sheet structure, and a through hole 201 is provided at the center of the aluminum plate 20. At the same time, the through hole 201 is also the welding hole for the positive electrode post 50. Through laser welding, the aluminum plate 20 and the positive electrode post 50 can be electrically connected. A convex cap 31 is provided at the center of the upper cover plate 30, and the through hole 201 is opposite to the position of the convex cap 31. The electrolyte can be injected into the housing through the through hole 201, the second through hole 501, and the first through hole 1031, and the convex cap 31 can ensure the sealed environment inside the battery. Specifically, a sealing steel ball 51 is also welded in the second through hole 501 of the positive electrode post 50, and the sealing ball 51 is used to seal the second through hole 501 after primary vacuum liquid injection, open-circuit formation, and secondary vacuum liquid injection. Sealing with the sealing steel ball ensures that the gas generated during the operation of the battery cell does not affect the traditional screw, the electrolyte will not overflow, effectively ensuring the internal environment of the battery cell and extending the service life of the battery cell. Designed in this way, the traditional primary liquid injection can be changed to realize secondary liquid injection, which can greatly improve the liquid injection efficiency. The traditional closed-circuit formation can be changed to realize open-circuit formation, and the gas generated during formation is discharged from the inside of the battery cell. The battery structure is reliably sealed after encapsulation. Secondary liquid injection can make the electrode plate better wetted by the electrolyte, increasing the service life of the battery cell. Open-circuit formation can discharge the gas generated during formation from the inside of the battery cell, providing space for secondary liquid injection and reducing the internal pressure, increasing the safety and service life of the product. The sealing is reliable, ensuring the safety of the product. Sealing with the sealing steel ball ensures that the gas generated during the operation of the battery cell does not affect the traditional screw, the electrolyte will not overflow, effectively ensuring the internal environment of the battery cell and extending the service life of the battery cell.

[0038] In some embodiments, an annular explosion-proof engraved line is provided on the surface of the aluminum plate 20 away from the upper cover plate 30, and the explosion-proof engraved line surrounds the through hole 201 of the aluminum plate. Specifically, the explosion-proof engraved line is formed by thinning the thickness through a laser engraving process, reducing the compressive strength here. When the internal pressure reaches a certain level, this part will be broken, and the internal gas will be discharged from the inside of the battery cell. And the explosion-proof engraved line is annular. After the explosion-proof engraved line is broken, the positive electrode post 50 and the aluminum plate 20 are cut off and conducted, greatly ensuring the safety of the battery cell during use.

[0039] In some embodiments, the edge of the aluminum plate 20 also extends outward to form a wrap-around edge 21. The wrap-around edge 21 bends towards the upper cover plate 30, and the bent wrap-around edge 21 is fixed on the upper cover plate 45 by laser welding, that is, the edge of the aluminum plate 20 wraps the upper cover plate 30, making the welding of the upper cover plate 30 more firm, capable of reducing the deformation coefficient during the encapsulation of the upper cover plate. The aluminum plate 20 plays a role in conducting the positive electrode post and the upper cover plate and relieving pressure.

[0040] Please refer to Figure 6, the sealing ring 40 includes a parallel top wall 42, a bottom wall 43, and a side wall 44 connecting the top wall 42 and the bottom wall 43. The top wall 42, the side wall 44, and the bottom wall 43 enclose the clamping groove 401, and the aluminum plate 20 and the upper cover plate 30 are clamped between the top wall 42 and the bottom wall 43.

[0041] In some embodiments, the water stop rib 41 includes a lower water stop rib 411. The bottom wall 43 protrudes toward the top wall 42 to form the lower water stop rib 411. The aluminum plate 20 abuts against the bottom wall 43 and presses the lower water stop rib 411. After encapsulation, the lower water stop rib 411 can prevent the electrolyte from penetrating through the contact surface between the aluminum plate and the sealing ring. A waterproof groove 4110 can be formed between the lower water stop rib and the side wall, and the waterproof groove 4110 can further prevent the electrolyte from overflowing. The aluminum plate 20 abuts against the bottom wall 43 and presses the lower water stop rib 43, which can make the connection between the aluminum plate and the sealing ring closer and the sealing more reliable.

[0042] In some embodiments, the water stop rib 41 includes a side water stop rib 412. The side wall 44 protrudes toward the center of the sealing ring 40 to form the side water stop rib 412. Specifically, the edge 21 of the aluminum plate 20 abuts against the top wall 42 and the side wall 44, and the edge 21 presses the side water stop rib 412. After encapsulation, the side water stop rib 412 can prevent the electrolyte from penetrating through the contact surface between the aluminum plate and the sealing ring. The edge 21 of the aluminum plate 20 abuts against the top wall 42 and the side wall 44, and the edge 21 presses the side water stop rib 412, which can make the connection between the aluminum plate and the sealing ring closer and the sealing more reliable.

[0043] In some embodiments, one end of the bottom wall 43 close to the center of the sealing ring 40 further extends away from the top wall 42 to form a bottom water stop rib 413. After encapsulation, the bottom water stop rib 413 can prevent the electrolyte from penetrating through the contact surface between the steel shell and the sealing ring, further ensuring the sealing performance of the battery.

[0044] The present invention also provides a cylindrical battery, including the sealing assembly of the cylindrical battery described in any one of the above. It should be noted that the embodiments of the sealing assembly 100 of the cylindrical battery provided by the present invention are all applicable to the cylindrical battery provided in this embodiment, and can achieve the same / similar technical effects.

[0045] In summary, for the sealing assembly 100 of the cylindrical battery and the cylindrical battery provided by the present utility model, the upper cover plate 30 is fixed on the aluminum plate 20. The sealing ring 40 is provided with an annular clamping groove 401, and several water-stop ribs 41 are convexly provided on the inner surface of the clamping groove 401. The upper cover plate 30 and the aluminum plate 20 are clamped in the clamping groove 401, and the upper cover plate 30 and / or the aluminum plate 20 abut against the inner surface of the clamping groove 401 and squeeze the water-stop ribs 41. The upper cover plate 30, the aluminum plate 20, and the sealing ring 40 are arranged at one end of the opening of the housing 10, and the outer surface of the sealing ring 40 abuts against the housing. The water-stop ribs 41 can prevent the electrolyte from leaking out from the surface where the upper cover plate 30 and / or the aluminum plate 20 contact the sealing ring 40. After the upper cover plate 30 and / or the aluminum plate 20 are assembled, they squeeze the water-stop ribs 41. After the water-stop ribs 41 are compressed by force, they have a certain restoring force, and the restoring force can make the connection between the upper cover plate 30, the aluminum plate 20, and the housing 10 closer, ensure the sealing of the internal space of the housing 10, and the sealing is reliable, thus ensuring the safety of the product.

[0046] The above is only the embodiment of the present utility model, and it does not limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present utility model.

Claims

1. A sealing assembly for a cylindrical battery, characterized in that: It includes a shell, an aluminum plate, an upper cover plate and a sealing ring; one end of the shell is open, the upper cover plate is fixed on the aluminum plate, the sealing ring is provided with an annular groove, the inner surface of the groove is convexly provided with a plurality of water stop ribs, the upper cover plate and the aluminum plate are clamped in the groove, the upper cover plate and / or the aluminum plate abut against the inner surface of the groove and squeeze the water stop ribs, the upper cover plate, the aluminum plate and the sealing ring are arranged at one end of the shell opening, and the outer surface of the sealing ring abuts against the shell.

2. The sealing assembly of a cylindrical battery according to claim 1, characterized in that: The sealing ring includes a parallel top wall, a bottom wall and a side wall connecting the top wall and the bottom wall. The top wall, the side wall and the bottom wall surround the slot. The aluminum plate and the upper cover plate are clamped between the top wall and the bottom wall.

3. The sealing assembly of a cylindrical battery as claimed in claim 2, characterized in that: The water stop rib comprises a lower water stop rib, the bottom wall protrudes toward the direction close to the top wall to form the lower water stop rib, and the aluminum plate abuts against the bottom wall and squeezes the lower water stop rib.

4. The sealing assembly of a cylindrical battery as claimed in claim 2, characterized in that: The water stop ribs include side water stop ribs, and the side walls protrude toward the center of the sealing ring to form the side water stop ribs.

5. The sealing assembly of a cylindrical battery as claimed in claim 4, characterized in that: The edge of the aluminum plate extends and is bent toward the upper cover plate to form an edge, the edge is fixed to the upper cover plate, the edge is against the top wall and the side wall, and the edge squeezes the side water stop rib.

6. The sealing assembly of a cylindrical battery as claimed in claim 2, characterized in that: One end of the bottom wall close to the center of the sealing ring also extends in a direction away from the top wall to form a bottom water stop rib.

7. The sealing assembly of a cylindrical battery as claimed in claim 1, characterized in that: The surface of the aluminum plate away from the upper cover plate is provided with explosion-proof marking lines.

8. The sealing assembly of a cylindrical battery as claimed in claim 1, characterized in that: A roller groove is rolled on a position of the shell near one end of the opening, and the aluminum plate, the upper cover plate and the sealing ring are located above the roller groove.

9. The sealing assembly of a cylindrical battery according to any one of claims 1 to 8, characterized in that: A through hole is opened at the center of the aluminum plate, a convex cap is arranged at the center of the upper cover plate, and the through hole is opposite to the convex cap.

10. A cylindrical battery, characterized in that: A sealing assembly comprising a cylindrical battery as claimed in any one of claims 1 to 9.

Images