Sealing structure of a cylindrical battery and cylindrical battery

Abstract

The present invention provides a sealing structure for a cylindrical battery and a cylindrical battery, including a sealing ring for a cylindrical battery provided for sealing the upper end opening of a battery steel shell; the sealing ring is composed of a central column, a battery steel shell contact part, and an annular disc-shaped part connected and arranged between the central column and the battery steel shell contact part; a section of the annular disc-shaped part close to the central column extends downward along the radial extension direction from the outer periphery to the center to form an annular slope section, the inclined lower end of the slope section extends downward to the outer peripheral surface of the central column, a negative electrode cover abutting part is provided at the inclined upper end of the slope section, and an explosion-proof groove is provided on the slope section. The force inside the battery acting on the slope section of the present invention becomes smaller after being decomposed, which is more beneficial for the battery to be stored for a long time without leakage; moreover, the effective volume of the reaction substances that can be filled inside the battery is also larger; the structure of the sealing ring is simple, reducing the injection molding difficulty.

Description

Technical Field

[0001] The present invention relates to the field of battery components, and particularly to a sealing structure of a cylindrical battery and a cylindrical battery. Background Art

[0002] For a cylindrical battery (such as an alkaline battery), the combination of a sealing ring, a copper pin and a bottom cover (also called "negative electrode cover") is called a current collector. The sealing ring is between the battery copper pin, the bottom cover (also called "negative electrode cover") and the battery steel shell, and mainly plays the role of sealing the internal space of the battery, preventing the battery electrolyte from leaking out during normal use and preventing the battery from exploding during abnormal use.

[0003] Under the condition that the external dimensions of the battery are limited and the sealing ring occupies a part of the internal space of the battery, the smaller the vertical distance from the upper surface of the negative electrode cover to the lowest point of the sealing ring except the central column, the larger the volume of the effective reactive substance that can be filled inside the battery. With the increasing demand for battery performance, the original sealing ring structure affects the increase of the internal substances of the battery, thus affecting the implementation of the scheme for improving battery performance. In addition, due to the inherent structural problems of the sealing rings of existing alkaline batteries, the situation where the sealing ring covers the isolation tube has not reached an ideal state. When the battery drops, under the impact, there is an accidental phenomenon that the negative electrode material inside the battery overflows from the opening of the isolation tube or the negative electrode material breaks through the opening of the isolation tube and overflows from the damaged part, resulting in an internal short circuit of the battery, thereby affecting the anti-drop performance and safety performance of the battery. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a sealing structure of a cylindrical battery, which can solve the problems existing in the above-mentioned prior art.

[0005] A sealing structure of a cylindrical battery includes a sealing ring for the cylindrical battery provided to seal the upper end opening of the battery steel shell;

[0006] The sealing ring is composed of a central column arranged along the central axis direction of the battery steel shell, a battery steel shell contact part that contacts the inner peripheral surface of the opening part when sealing the battery steel shell, and an annular disk-shaped part connected and arranged between the central column and the battery steel shell contact part;

[0007] A section of the annular disk-shaped part close to the central column is inclined downward along the radial extension direction from the outer periphery to the center to form an annular slope section. The inclined lower end of the slope section extends downward to the outer peripheral surface of the central column, and a negative electrode cover abutting part is provided at the inclined upper end of the slope section;

[0008] An explosion-proof groove is provided on the slope section.

[0009] Under normal circumstances, the internal air pressure of the battery is greater than the external atmospheric pressure, and the inner sealing ring of the battery is subjected to an upward pressure. Since a section of the annular disc portion near the central column of the present invention is inclined downward along the radial direction from the outer periphery to the center to form an annular slope section, the upward force acting on the slope section will be decomposed into an upward force perpendicular to the slope section and an upward force parallel to the slope section. As the internal pressure gradually increases, the negative electrode cover contact portion of the sealing ring will contact and fit tightly with the negative electrode cover. After contact, the upward force of the sealing ring on the slope section will be offset by the supporting force given by the negative electrode cover, effectively suppressing the continuous upward and outward deformation inside the sealing ring. Compared with the structure in which the annular disc portion of the existing alkaline battery sealing ring is horizontally arranged, the force on the slope section of the sealing ring of the present invention becomes smaller after decomposition, which is more conducive to the long-term storage of the battery without leakage. And, when the battery is installed and used incorrectly, the battery may be short-circuited or charged, resulting in an increase in the internal temperature and internal air pressure of the battery. To prevent the battery from exploding, the internal gas of the battery needs to be released before the internal pressure of the battery is greater than the battery sealing force. This requires the explosion-proof groove of the sealing ring to rupture and the sealing ring cannot be closely attached to the top of the negative electrode cover and the explosion-proof hole on the negative electrode cover, so that the internal pressure of the battery can be released from the damaged part of the sealing ring to the explosion-proof hole of the negative electrode cover. Before the sealing ring ruptures, the slope section will experience an upward deformation process. Compared with the structure in which the annular disc portion of the existing alkaline battery sealing ring is horizontally arranged, the deformation amount of the sealing ring before rupture is smaller under the slope section design. In addition, the slope section design is beneficial to increasing the distance from the explosion-proof groove in the slope section to the top of the negative electrode cover, that is, increasing the deformation space required when the explosion-proof groove of the sealing ring ruptures, preventing the sealing ring from being closely attached to the top of the negative electrode cover, and also enabling the sealing ring to be thinner while ensuring the safety performance of the incorrect installation of the battery, thereby increasing the volume of the effective reactive substances that can be filled inside the battery and providing an effective path for improving the battery performance. In addition, the structure of the sealing ring is simple, reducing the injection molding difficulty.

[0010] Preferably, the explosion-proof groove is located on the lower surface of the slope section.

[0011] Preferably, the explosion-proof groove is an annular groove extending circumferentially around the central column. In the specific implementation process, the cross-section of the explosion-proof groove preferably has a shape that gradually contracts from the outside to the inside with the outside being larger and the inside being smaller.

[0012] Preferably, the ratio of the thickness of the non-explosion-proof groove position of the slope section to the thickness of the thinnest part of the explosion-proof groove is 2 to 6.

[0013] Preferably, the explosion-proof groove is located at a position on the slope section close to the outer peripheral surface of the central column.

[0014] Preferably, when sealing the battery steel shell, a cylindrical negative electrode cover for the battery is further embedded and fastened within the inner cavity of the sealing ring seamlessly enclosed by the inner peripheral surface of the battery steel shell contact portion, the upper surface of the annular disc-shaped portion, and the outer peripheral surface of the central column. The outermost edge of the negative electrode cover is a cover eaves. During the specific implementation process, the upper edge of the battery steel shell contact portion is turned over towards the negative electrode cover to form an annular sealing ring flanging. The upper peripheral edge of the cover eaves is fitted with the inner peripheral surface of the sealing ring flanging. The upper edge of the battery steel shell is turned over towards the sealing ring to form an annular battery steel shell flanging. The battery steel shell flanging presses against the outer peripheral surface of the sealing ring flanging and provides a downward pressing force on the sealing ring flanging and the upper peripheral edge of the cover eaves, thereby achieving the sealing of the battery. Further, the negative electrode cover further includes an annular cover side wall extending upward from the inner peripheral edge of the cover eaves. An arc transition portion is provided at the connection position between the cover side wall and the cover eaves. The negative electrode cover contact portion is an arc-shaped groove adapted to the lower surface of the arc transition portion. The cooperation between the ramp section of the sealing ring and the arc transition portion of the negative electrode cover has a better tight-fitting effect, better contact stability, and better stress dispersion effect. Furthermore, when the ramp section of the sealing ring is not deformed, there is a gap of 0.02 - 0.3 mm wide between the lower surface of the arc transition portion and the negative electrode cover contact portion. When the ramp section of the sealing ring is deformed under the internal pressure of the battery, the lower surface of the arc transition portion is in contact and cooperation with the negative electrode cover contact portion. As the internal pressure gradually increases, the negative electrode cover contact portion of the sealing ring and the negative electrode cover will gradually approach, contact, and finally fit tightly. When the ramp section of the sealing ring is not deformed, the lower surface of the arc transition portion and the negative electrode cover contact portion do not contact each other. Of course, when the ramp section of the sealing ring is not deformed, the lower surface of the arc transition portion and the negative electrode cover contact portion may also contact each other. The negative electrode cover further includes a cover top at the upper end opening of the cover side wall. A copper pin is vertically provided on the lower surface of the cover top. A central hole for inserting the copper pin is opened along the central axis direction of the central column. When assembling the battery, the lower end of the copper pin passes through the central hole and is inserted into the negative electrode material located within the separator tube.

[0015] Preferably, the cover eaves of the negative electrode cover are sequentially divided into a cover eaves horizontal section and a cover eaves downward inclined extension section along the radial direction from the outside to the center. The outer peripheral surface of the cover eaves horizontal section is fitted with the inner peripheral surface of the battery steel shell contact portion of the sealing ring. The angle between the cover eaves downward inclined extension section and the horizontal plane is 5° - 45°. The cover eaves design of the present invention is beneficial for making the battery current collector thinner and lighter, and is also beneficial for the insertion of the battery bottom ring located outside the negative electrode cover, which is used to prevent the battery steel shell and the negative electrode cover from being connected by metal substances and causing external short circuits.

[0016] Preferably, a plurality of explosion-proof holes are provided at intervals along the circumferential direction of the side wall of the cover. The explosion-proof holes are generally strip-shaped. The number of the explosion-proof holes is preferably an even number and is evenly and symmetrically distributed on the side wall of the cover. The explosion-proof holes are provided to release the internal gas when the amount of gas inside the battery is large enough to rupture the sealing ring, thereby reducing potential safety hazards.

[0017] Preferably, an annular recessed section is formed by downward recessing along the circumferential direction on the annular disc-shaped portion of the sealing ring; the recessed section is sequentially divided into a downward section, an intermediate transition section, and an upward section along the radial direction from the outside to the center. The lower surface of the upward section is connected to the lower surface of the slope section by an arc transition, thereby forming an arc-shaped accommodating groove for the end of the isolation tube on the lower surface of the annular disc-shaped portion of the sealing ring. When the sealing ring is installed into the battery steel shell, a cylindrical isolation tube is coaxially embedded in the battery steel shell; when the sealing ring is vertically inserted into the upper end opening of the positive electrode steel shell, the upper end of the isolation tube abuts against the lower surface of the upward section and is bent toward the center side under the guiding action of the inner side surface of the accommodating groove for the end of the isolation tube to form a flanging of the upper edge of the isolation tube, so that the upper surface of the flanging of the upper edge of the isolation tube is tightly fitted with the lower surface of the slope section. When the battery is sealed, the external force applied to the battery is conducted from the battery steel shell to the contact portion of the sealing ring with the battery steel shell and then to the explosion-proof groove from the outside to the inside. The explosion-proof groove is the weakest position of the sealing ring. The design of the recessed section can not only buffer the external force received by the sealing ring at this part and prevent it from continuing to be conducted to the explosion-proof groove, thereby reducing the probability of damage to the explosion-proof groove during sealing. Moreover, the upper end of the isolation tube of the present invention is bent inward under the guiding action of the inner side surface of the accommodating groove for the end of the isolation tube, and the isolation tube is bent inward and downward at a larger angle, with a better fitting effect with the sealing ring, improving the situation where the sealing ring covers the isolation tube, reducing the probability of internal short circuit caused by the negative electrode material in the inner cavity of the isolation tube overflowing from the upper end of the isolation tube or the isolation tube being damaged and the negative electrode material overflowing after the battery falls, and improving the battery quality.

[0018] The second object of the present invention is to provide a cylindrical battery having the sealing structure of the cylindrical battery described in the first object of the present invention. Description of the Drawings

[0019] Figure 1 is a longitudinal sectional structure schematic diagram of the sealing ring for the cylindrical battery of the present invention;

[0020] Figure 2 is a longitudinal sectional structure schematic diagram of the sealing structure of the cylindrical battery and the cylindrical battery of the present invention;

[0021] Wherein Figure 1 and Figure 2 the dotted lines in are the central axes of the sealing ring. Detailed Embodiments

[0022] The sealing structure of the cylindrical battery of the present invention and the best specific implementation of the cylindrical battery are described in detail below in conjunction with the accompanying drawings:

[0023] Combination Figure 1 and Figure 2 , a sealing structure of a cylindrical battery, comprising a cylindrical battery sealing ring 20 provided to seal the upper end opening of a battery steel shell 10;

[0024] The sealing ring 20 is composed of a central column 21 arranged along the central axis direction of the battery steel shell 10, a battery steel shell contact portion 22 that contacts the inner peripheral surface 11 of the opening when the battery steel shell 10 is sealed, and an annular disc portion 23 connected between the central column 21 and the battery steel shell contact portion 22;

[0025] A section of the annular disc-shaped portion 23 close to the central column 21 is inclined downward along a radial extension direction from the outer periphery to the center to form an annular slope section 231, the inclined lower end of the slope section 231 extends downward to the outer peripheral surface of the central column 21, and the inclined upper end of the slope section 231 is provided with a negative electrode cover abutment portion 232;

[0026] An explosion-proof trench 24 is provided on the slope section 231;

[0027] When the battery steel shell 10 is sealed, a cylindrical battery negative electrode cover 30 is embedded and fastened in the inner cavity of the sealing ring which is seamlessly enclosed by the inner circumference of the battery steel shell contact part 22, the upper surface of the annular disc-shaped part 23 and the outer circumference of the central column 21. The outermost edge of the negative electrode cover 30 is a cover brim 33.

[0028] The negative electrode cover 30 also includes an annular cover side wall 32 extending upward from the inner circumference of the cover eave 33, and a circular arc transition portion 34 is provided at the connection position between the cover side wall 32 and the cover eave 33, and the negative electrode cover abutment portion 232 is an arc groove adapted to the lower surface of the circular arc transition portion 34;

[0029] When the slope section 231 of the sealing ring 20 is not deformed, there is a gap 100 with a width of 0.02-0.3 mm between the lower surface of the arc transition portion 34 and the negative electrode cover contact portion 232; when the slope section 231 of the sealing ring 20 is deformed under the action of the internal pressure of the battery, the lower surface of the arc transition portion 34 contacts and cooperates with the negative electrode cover contact portion 232.

[0030] like Figure 2 As shown, a cylindrical battery has the sealing structure of the cylindrical battery mentioned above.

[0031] When sealing the battery steel shell 10, the upper edge of the battery steel shell contact part 22 is turned over towards the negative electrode cover 30 to form an annular sealing ring flange 221, and the upper circumferential edge of the cover eaves 33 is fitted with the inner circumferential surface of the sealing ring flange 221; the upper edge of the battery steel shell 10 is turned over towards the sealing ring 20 to form an annular battery steel shell flange 12, and the battery steel shell flange 12 presses against the outer circumferential surface of the sealing ring flange 221 and provides a downward pressing force on the upper circumferential edge of the sealing ring flange 221 and the cover eaves 33, thereby realizing the sealing of the battery.

[0032] Under normal circumstances, the air pressure inside the battery is greater than the external atmospheric pressure. As the internal pressure gradually increases, the negative electrode cover contact part 232 of the sealing ring 20 will gradually approach, contact, and finally fit tightly with the negative electrode cover 30. Compared with the structure where the annular disc part 23 of the sealing ring of the existing alkaline battery is horizontally arranged, the force on the slope section 231 of the sealing ring 20 of the present invention is decomposed and becomes smaller, which is more conducive to the long-term storage of the battery without leakage; and, compared with the structure where the annular disc part 23 of the sealing ring of the existing alkaline battery is horizontally arranged, the deformation amount of the sealing ring 20 before rupture is smaller under the design of the slope section 231, avoiding the sealing ring 20 from deforming and tightly adhering to the top of the negative electrode cover 31 and the explosion-proof hole 321 on the negative electrode cover 30; at the same time, the effective volume for filling reactive substances inside the battery is larger; in addition, the structure of the sealing ring 20 is simple, reducing the injection molding difficulty.

[0033] Of course, when the slope section 231 of the sealing ring 20 is not deformed, the lower surface of the arc transition part 34 can also be in contact with the negative electrode cover contact part 232. In addition, when the negative electrode cover contact part 232 is in contact with the negative electrode cover 30, the two can be in point contact, line contact, or surface contact of any shape, but the cooperation and tight fit effect between the slope section 231 of the sealing ring 20 and the arc transition part 34 of the negative electrode cover 30 is better, the contact stability is better, and the stress dispersion effect is better.

[0034] Preferably, as Figure 1 and Figure 2 shown, an explosion-proof groove 24 is provided on the lower surface of the slope section 231. Of course, the explosion-proof groove 24 can also be located on the upper surface of the slope section 231.

[0035] Preferably, the explosion-proof groove 24 is an annular groove extending circumferentially around the central column 21. As Figure 1 and Figure 2 shown, the cross-section of the explosion-proof groove 24 preferably has a shape that gradually contracts from the outside to the inside with the outside larger and the inside smaller.

[0036] Preferably, the ratio of the thickness A at the non-explosion-proof groove position of the slope section 231 to the thickness D at the thinnest part of the explosion-proof groove is 2 to 6.

[0037] Preferably, as Figure 1 and Figure 2 shown, the explosion-proof groove 24 is located at a position on the slope section 231 close to the outer peripheral surface of the central column 21. Of course, the explosion-proof groove 24 can be located at any position on the slope section 231.

[0038] Preferably, the negative electrode cover 30 further includes a cover top 31 located at the upper opening of the cover side wall 32. A copper needle 40 is provided vertically at the center of the lower surface of the cover top 31 (the negative electrode cover 30 and the copper needle 40 are usually connected by welding). A central hole 211 for inserting the copper needle 40 is opened on the central column 21 along its central axis direction. When assembling the battery, the lower end of the copper needle 40 passes through the central hole 211 and is inserted into the negative electrode material located in the separator tube 50.

[0039] Preferably, as Figure 2 shown, the cover eaves 33 are sequentially divided into a cover eaves horizontal section 331 and a cover eaves downwardly inclined extension section 332 along the radial direction from the outside to the center; the outer peripheral surface of the cover eaves horizontal section 331 is fitted with the inner peripheral surface of the contact part 22 of the battery steel shell of the sealing ring; the angle between the cover eaves downwardly inclined extension section 332 and the horizontal plane is 5° to 45°. The design of the cover eaves 33 of the present invention is beneficial to making the battery current collector thinner and lighter, and is also beneficial to the insertion of the battery bottom ring located outside the negative electrode cover 30 and used to prevent the battery steel shell 10 and the negative electrode cover 30 from being connected by metal substances to cause an external short circuit.

[0040] In the specific implementation process, as Figure 2 shown, several explosion-proof holes 321 are provided at intervals along the circumferential direction on the cover side wall 32. The explosion-proof holes 321 are usually strip-shaped. The number of the explosion-proof holes 321 is preferably an even number and is evenly and symmetrically distributed on the cover side wall. The explosion-proof holes 321 are provided so that after the internal gas volume of the battery is large enough to cause the sealing ring to rupture, the internal gas can be released to reduce potential safety hazards.

[0041] Preferably, as Figure 1 and Figure 2As shown, an annular concave section 233 is formed by circumferentially downwardly recessing the annular disc-shaped portion 23 of the sealing ring 20; the concave section 233 is sequentially divided into a downward section, an intermediate transition section, and an upward section along the radial direction from the outside to the center, and the lower surface of the upward section is arc-transitionally connected to the lower surface of the slope section 231, thereby forming an arc-shaped accommodating groove 26 for the end of the isolation tube on the lower surface of the annular disc-shaped portion 23 of the sealing ring. When the sealing ring is installed into the battery steel shell, a cylindrical isolation tube 50 is coaxially embedded in the battery steel shell 10; when the sealing ring 20 is vertically inserted into the upper end opening of the positive electrode steel shell 10, the upper end of the isolation tube 50 abuts against the lower surface of the upward section and is bent towards the center side under the guiding action of the inner side surface of the accommodating groove 26 for the end of the isolation tube to form an upward flange 51 of the isolation tube, so that the upper surface of the upward flange 51 of the isolation tube fits with the lower surface of the slope section 231. When the battery is sealed, the external force applied to the battery is conducted from the battery steel shell 10 to the battery steel shell contact portion 22 of the sealing ring 20 and then to the explosion-proof groove 24 from the outside to the inside. The explosion-proof groove 24 is the weakest position of the sealing ring. The design of the concave section 233 can not only buffer the external force received by the sealing ring 20 at this part and prevent it from continuing to be conducted to the explosion-proof groove 24, but also reduce the probability of damage to the explosion-proof groove 24 of the battery sealing ring during sealing. Moreover, the upper end of the isolation tube 50 of the present invention is bent inwards under the guiding action of the inner side surface of the accommodating groove 26 for the end of the isolation tube, and the isolation tube 50 is bent inwards at a larger angle, resulting in a better fitting effect with the sealing ring 20, improving the situation where the sealing ring 20 covers the isolation tube 50, reducing the probability of internal short circuit caused by the negative electrode material in the inner cavity of the isolation tube 50 overflowing from the upper end of the isolation tube or the isolation tube being damaged and the negative electrode material overflowing after the battery falls, and enhancing the battery quality. Of course, the annular disc-shaped portion 23 of the present invention may not be provided with the concave section 233.

[0042] In addition, the shape of the concave section 233 of the present invention is not limited to the "U" shape in the drawings, and it may also be a "V" shape or the like.

[0043] For those of ordinary skill in the art to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A sealing structure for a cylindrical battery, comprising a sealing ring for a cylindrical battery provided to seal the upper opening of the battery steel shell; The sealing ring is composed of a central column arranged along the central axis direction of the battery steel shell, a battery steel shell contact portion that contacts the inner peripheral surface of the opening portion when sealing the battery steel shell, and an annular disc-shaped portion connected between the central column and the battery steel shell contact portion; and it is characterized in that: A section of the annular disc-shaped portion near the central column is inclined downward along the radial extension direction from the outer periphery to the center to form an annular slope section, the inclined lower end of the slope section extends downward to the outer peripheral surface of the central column, and the inclined upper end of the slope section is provided with a negative electrode cover abutting portion; An explosion-proof groove is provided on the slope section; The annular disc-shaped portion of the sealing ring is recessed downward along its circumference to form an annular recessed section; the recessed section is sequentially divided into a downward section, an intermediate transition section, and an upward section along the radial direction from the outside to the center. The lower surface of the upward section is arc-transitionally connected to the lower surface of the slope section, so as to form an arc-shaped accommodating groove for the end of the isolation tube on the lower surface of the annular disc-shaped portion of the sealing ring. When the sealing ring is installed into the battery steel shell, a cylindrical isolation tube is coaxially embedded in the battery steel shell. The upper end of the isolation tube abuts against the lower surface of the upward section and is bent toward the center side under the guiding action of the inner side surface of the accommodating groove for the end of the isolation tube to form a flanging of the upper edge of the isolation tube, and the upper surface of the flanging of the upper edge of the isolation tube is tightly fitted with the lower surface of the slope section.

2. The sealing structure of the cylindrical battery according to claim 1, characterized in that: The included angle formed by the slope section and the horizontal plane is 5° to 45°.

3. The sealing structure of the cylindrical battery according to claim 1, characterized in that: The explosion-proof groove is located at a position on the slope section close to the outer peripheral surface of the central column.

4. The sealing structure of the cylindrical battery according to claim 1, characterized in that: The explosion-proof groove is located on the lower surface of the slope section, and the explosion-proof groove is an annular groove extending circumferentially with the central column as the center.

5. The sealing structure of the cylindrical battery according to claim 1, characterized in that: The ratio of the thickness at the non-explosion-proof groove position of the slope section to the thinnest thickness of the explosion-proof groove is 2 to 6.

6. The sealing structure of the cylindrical battery according to claim 1, characterized in that: When sealing the battery steel shell, a negative electrode cover for a cylindrical battery is also embedded and fastened in the inner cavity of the sealing ring seamlessly enclosed by the inner peripheral surface of the battery steel shell contact portion, the upper surface of the annular disc-shaped portion, and the outer peripheral surface of the central column. The outermost edge of the negative electrode cover is a cover eaves, and an annular cover side wall is formed by the upward extension of the inner peripheral edge of the cover eaves. An arc transition portion is provided at the connection position between the cover side wall and the cover eaves, and the negative electrode cover abutting portion is an arc-shaped groove adapted to the lower surface of the arc transition portion.

7. The sealing structure of the cylindrical battery according to claim 6, wherein: When the slope section of the sealing ring does not deform, there is a gap with a width of 0.02 - 0.3 mm between the lower surface of the arc transition portion and the negative electrode cover abutting portion; when the slope section of the sealing ring deforms under the action of the internal pressure of the battery, the lower surface of the arc transition portion abuts and cooperates with the negative electrode cover abutting portion.

8. The sealing structure of the cylindrical battery according to claim 1, characterized in that: When sealing the battery steel shell, a cylindrical negative electrode cover for the battery is also embedded and fastened within the inner cavity of the sealing ring seamlessly enclosed by the inner peripheral surface of the battery steel shell contact portion, the upper surface of the annular disc-shaped portion, and the outer peripheral surface of the central column. The outermost edge of the negative electrode cover is a cover eaves, and the cover eaves is sequentially composed of a cover eaves horizontal section and a cover eaves downward inclined extension section along the radial direction from outside to the center; the outer peripheral surface of the cover eaves horizontal section is in contact with the inner peripheral surface of the battery steel shell contact portion of the sealing ring; the acute angle between the cover eaves downward inclined extension section and the horizontal plane is 5° to 45°.

9. A cylindrical battery having the sealing structure of the cylindrical battery according to any one of claims 1 to 8.

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