Cylindrical rechargeable battery

Abstract

A cylindrical rechargeable battery of the disclosure includes a can including an internal space and having an opening, an electrode assembly accommodated in the internal space of the can, and a cap assembly coupled to the can, sealing the opening, and including an upper cap and a safety vent positioned below the upper cap, wherein a distance between an uppermost portion of the upper cap and the safety vent is in a range of 1.6 mm to 1.8 mm.

Description

Technical Field

[0001] This disclosure relates to a cylindrical rechargeable battery. Background Technology

[0002] Unlike primary batteries, rechargeable batteries can be repeatedly charged and discharged. Low-capacity rechargeable batteries, including electrode assemblies packaged in a pack, can be used as power sources for a variety of small portable electronic devices such as cell phones and portable cameras, while high-capacity rechargeable batteries with dozens of connected electrode assemblies can be used as power sources for motors in vehicles such as electric scooters, hybrid cars, and electric cars.

[0003] Rechargeable batteries can be manufactured in various shapes, including cylindrical rechargeable batteries which include cylindrical electrode assemblies, a cylindrical can containing the electrode assemblies and electrolyte, and a cover assembly coupled to a top opening of the can to seal the can and allow current generated in the electrode assemblies to flow to an external device.

[0004] When gas is generated inside the rechargeable battery, a safety vent in the cover assembly tears to allow the gas to pass through. However, if there is insufficient space in the cover assembly, the safety vent may interfere with the cover, and the safety vent may not tear properly, making it difficult for gas to pass through. Alternatively, the cover may deform when the safety vent comes into contact with it. Summary of the Invention

[0005] [Technical Issues] This disclosure attempts to overcome the aforementioned conventional problems and provides a cylindrical rechargeable battery capable of preventing interference between the safety vent and the top cover.

[0006] The technical solutions available from this disclosure are not limited to the above-mentioned technical solutions, and those skilled in the art to which this disclosure pertains will clearly understand from the following description other unmentioned technical solutions.

[0007] [Technical Solution] To solve the aforementioned technical problems, a cylindrical rechargeable battery according to an embodiment of the present disclosure includes: a can, including an internal space and having an opening; an electrode assembly, housed in the internal space of the can; and a cover assembly, coupled to the can and sealing the opening, wherein the cover assembly includes an upper cover and a safety vent located below the upper cover, wherein the upper cover includes a coupling portion coupled to the safety vent, a protrusion disposed inside the coupling portion and protruding outward relative to the coupling portion, and a connector connecting the coupling portion and the protrusion portion, and the thickness of the protrusion portion is thinner than the thickness of the coupling portion.

[0008] The distance between the top of the cover and the safety vent can be in the range of 1.6mm to 1.8mm.

[0009] The vertical distance from the bottom of the joint to the bottom of the protrusion can be in the range of 1.3mm to 1.4mm.

[0010] The radius of curvature of the portion of the connector on the upper surface of the top cover adjacent to the mating part can exceed 0.5 mm.

[0011] The thickness of the connector can increase from the protrusion to the mating part.

[0012] The safety vent may include: an vent contact portion that contacts the top cover; an vent slope portion that slopes downward from the vent contact portion; an vent bottom portion that extends from the vent slope portion and is arranged parallel to the vent contact portion; and an vent protrusion portion that protrudes in one direction from the bottom of the vent.

[0013] The distance between the protrusion of the top cover and the exhaust protrusion of the safety vent can be in the range of 1.6mm to 1.8mm.

[0014] The connector on the top cover may have one or more gas penetration holes.

[0015] [Beneficial Effects] The cylindrical rechargeable battery according to this disclosure ensures sufficient space between the top cover and the safety vent. Therefore, the safety vent can smoothly deform due to the gas inside the can, and the gas can pass through the safety vent and be discharged to the outside through the gas penetration hole. Furthermore, deformation of the safety vent upon contact with the top cover is prevented.

[0016] In the cylindrical rechargeable battery according to an embodiment of the present disclosure, the connector of the top cover 141 may have a thickness that increases from the protrusion to the mating portion. Therefore, it is possible to prevent the top cover from deforming due to stress during the pressing process.

[0017] Furthermore, the cylindrical rechargeable battery according to an embodiment of the present disclosure is formed such that the radius of curvature of the portion of the upper surface of the connector of the top cover adjacent to the mating portion exceeds 0.5 mm. Therefore, the cylindrical rechargeable battery according to an embodiment of the present disclosure can prevent the top cover from deforming during the pressing process. Attached Figure Description

[0018] Figure 1 This is a perspective view showing a cylindrical rechargeable battery according to an embodiment of the present disclosure.

[0019] Figure 2 It is shown Figure 1 Exploded perspective view of a cylindrical rechargeable battery.

[0020] Figure 3 It is shown Figure 1 A cross-sectional view of a cylindrical rechargeable battery.

[0021] Figure 4 It is shown Figure 3 A cross-sectional view of the top cover, safety vent, and bottom cover of a cylindrical rechargeable battery.

[0022] Figure 5 This is a cross-sectional view showing the process of manufacturing the top cover by pressing using a forging method.

[0023] Figure 6 These are photographs of a cylindrical rechargeable battery according to an embodiment of the present disclosure, with some components removed for inspection.

[0024] Figure 7 It shows the deformation caused by the internal gas. Figure 6 A photo of the safety vent of a cylindrical rechargeable battery.

[0025] Figure 8 This is a photograph showing the state of the safety vent of a cylindrical rechargeable battery according to a comparative example deformed due to internal gas. Detailed Implementation

[0026] Preferred embodiments further illustrate the invention. However, these embodiments are provided only to facilitate understanding by those skilled in the art and may be embodied in many different forms, and should not be construed as limiting themselves to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the inventive concept to those skilled in the art.

[0027] Additionally, for the sake of brevity and clarity, the dimensions or thicknesses of various components are exaggerated in the accompanying drawings, and the same reference numerals always denote the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, it should be understood that when element A is referred to as being "connected to" element B, element A may be directly connected to element B, or an intermediary element C may exist between them such that element A and element B are indirectly connected to each other.

[0028] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It should also be understood that when the terms “comprising,” “including,” and / or variations thereof are used in this specification, it indicates the presence of the stated features, quantities, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, quantities, steps, operations, elements, components, and / or groups thereof.

[0029] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various components, elements, regions, layers, and / or parts, these components, elements, regions, layers, and / or parts should not be limited by these terms. These terms are used only to distinguish one component, element, region, layer, and / or part from another. Thus, for example, without departing from the teachings of this disclosure, the first component, first element, first region, first layer, and / or first part discussed below may be referred to as a second component, second element, second region, second layer, and / or second part.

[0030] Furthermore, for ease of description, spatial relative terms such as "below," "under," "lower," "above," and "upper" may be used herein to describe the relationship between one element or feature and another element(s) shown in the figures. These spatial relative terms are intended to facilitate understanding of the invention according to different orientations of the device in use or operation, and are not intended to limit the disclosure. For example, if an element or feature in the figures is flipped, an element described as "below" or "under" other elements or features would subsequently be oriented "above" or "on" other elements or features. Thus, the exemplary term "below" can encompass both "above" and "below" orientations.

[0031] In the following, a rechargeable battery according to an embodiment of the present disclosure will be described in detail with reference to the accompanying drawings.

[0032] Figure 1 This is a perspective view illustrating a cylindrical rechargeable battery according to an embodiment of the present disclosure. Figure 2 It is shown Figure 1 Exploded perspective view of a cylindrical rechargeable battery. Figure 3 It is shown Figure 1 A cross-sectional view of a cylindrical rechargeable battery.

[0033] like Figures 1 to 3 As shown, the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure includes a cylindrical can 110, an electrode assembly 120, and a cap assembly 140.

[0034] The can 110 may include a circular bottom 111 and cylindrical sides 112 extending upward from the bottom 111 for a predetermined length. During the assembly of the cylindrical rechargeable battery 100, the upper part of the can 110 is open. Therefore, during the assembly of the cylindrical rechargeable battery, the electrode assembly 120 can be inserted into the cylindrical can 110 along with the electrolyte. For this purpose, the can 110 may include an opening.

[0035] Can 110 may include steel, steel alloy, aluminum, aluminum alloy, or equivalents thereof. The cylindrical can 110 may have a rolled edge 113 that is recessed inward in the direction below and surrounds the cover assembly 140 to prevent the electrode assembly 120 and the cover assembly 140 from separating outward, and the cylindrical can 110 may have a crimped portion 114 that is bent inward at the top.

[0036] Electrode assembly 120 may be housed inside cylindrical container 110. Electrode assembly 120 may include a negative electrode plate 121 coated with a negative electrode active material (e.g., graphite or carbon), a positive electrode plate 122 coated with a positive electrode active material (e.g., transition metal oxides (LiCoO2, LiNiO2, LiMn2O4)), and a separator 123 located between negative electrode plate 121 and positive electrode plate 122 to prevent short circuits and allow only lithium ion movement.

[0037] The negative electrode plate 121, the positive electrode plate 122, and the diaphragm 123 can be wound into a generally cylindrical shape. The negative electrode plate 121 may include copper (Cu) or nickel (Ni) foil, the positive electrode plate 122 may include aluminum (Al) foil, and the diaphragm 123 may include polyethylene (PE) or polypropylene (PP).

[0038] The negative electrode tab 124, which protrudes downward and extends to a certain length, can be soldered to the negative electrode plate 121, and the positive electrode tab 125, which protrudes upward to a certain length, can be soldered to the positive electrode plate 122, but the reverse is also possible. The negative electrode tab 124 may be made of copper or nickel, and the positive electrode tab 125 may be made of aluminum.

[0039] The negative electrode terminal 124 of the electrode assembly 120 can be soldered to the bottom 111 of the cylindrical can 110. Therefore, the can 110 can be used as a negative electrode. Conversely, the positive electrode terminal 125 can be soldered to the bottom 111 of the cylindrical can 110, and in this case, the cylindrical can 110 can be used as a positive electrode.

[0040] A first insulating plate 126 may be placed between the electrode assembly 120 and the bottom 111. The first insulating plate 126 is attached to the cylindrical can 110 and has a first hole 126a at the center and a second hole 126b on the outer side. The first insulating plate 126 can prevent the electrode assembly 120 from making electrical contact with the bottom 111 of the cylindrical can 110.

[0041] The first insulating plate 126 prevents the positive electrode plate 122 of the electrode assembly 120 from making electrical contact with the bottom 111. When a large amount of gas is generated due to an anomaly in the cylindrical rechargeable battery, the first hole 126a allows the gas to move rapidly upward through the center pin 130. Additionally, the negative electrode tab 124 can be soldered to the bottom 111 through the second hole 126b.

[0042] The second insulating plate 127 can be placed between the electrode assembly 120 and the cover assembly 140. The second insulating plate 127 is attached to the cylindrical can 110 and has a first hole 127a at the center and a plurality of second holes 127b on the outer side.

[0043] The second insulating plate 127 can prevent the electrode assembly 120 from making electrical contact with the cover assembly 140. The second insulating plate 127 can limit the electrical contact between the negative electrode plate 121 of the electrode assembly 120 and the cover assembly 140.

[0044] The first hole 127a allows gas to move rapidly to the cover assembly 140 when a large amount of gas is generated due to an anomaly in the cylindrical rechargeable battery. The second hole 127b allows the positive electrode tab 125 to penetrate and be soldered to the cover assembly 140. In addition, the remaining second hole 127b allows electrolyte to flow rapidly into the electrode assembly 120 during the electrolyte injection process.

[0045] On the other hand, the diameter of each of the first hole 126a in the first insulating plate 126 and the first hole 127a in the second insulating plate 127 can be smaller than the diameter of the center pin 130. Therefore, the center pin 130 can be prevented from making electrical contact with the bottom 111 of the can 110 or the cover assembly 140 due to external impact.

[0046] The center pin 130 has the shape of a hollow circular tube and can be coupled to the approximate center of the electrode assembly 120. The center pin 130 may comprise steel, a steel alloy, aluminum, an aluminum alloy, or polybutylene terephthalate.

[0047] The center pin 130 is used to suppress deformation of the electrode assembly 120 during battery charging and discharging, and serves as a channel for the movement of gas generated inside the cylindrical rechargeable battery. In some cases, the center pin 130 may be omitted.

[0048] The lid assembly 140 is attached to the can 110 and seals the opening of the can 110. The lid assembly 140 includes a top cover 141 and a safety vent 142 located below the top cover 141. One or more gas penetration holes 141e may be present in the top cover 141. The gas penetration holes 141e allow gases generated inside the can vent to the outside.

[0049] The cover assembly 140 may include a connecting ring 143 located below the safety vent 142, a plurality of through holes 144a located below the safety vent 142 and the connecting ring 143, and a lower cover 144 electrically connected to the positive electrode terminal 125. The lower cover 144 is disposed on the opposite side of the upper cover 141, and the safety vent 142 is located between the lower cover 144 and the upper cover 141. Additionally, the cover assembly 140 may also include an insulating gasket 145.

[0050] An insulating gasket 145 insulates the upper cover 141, the safety vent 142, and the lower cover 144 from the side 112 of the can 110. The insulating gasket 145 can be substantially compressed between the rolled edge 113 and the crimped portion 114 included in the side 112 of the can 110.

[0051] When abnormal internal pressure occurs inside tank 110, the through-hole 141e of the upper cover 141 and the through-hole 144a of the lower cover 144 can release internal gas to the outside. The internal gas, passing through the through-hole 144a of the lower cover 144, causes the safety vent 142 to flip upwards. At this time, the safety vent 142 is electrically disengaged from the lower cover 144. Then, the safety vent 142 can be torn, allowing internal gas to be released to the outside through the through-hole 141e of the upper cover 141.

[0052] An electrolyte (not shown) can be injected into tank 110. The electrolyte allows lithium ions generated by electrochemical reactions on the negative electrode plate 121 and positive electrode plate 122 inside the battery to move during charging and discharging. The electrolyte may include a non-aqueous organic electrolyte as a mixture of lithium salt and high-purity organic solvent. The electrolyte may include a polymer or a solid electrolyte using a polymer electrolyte.

[0053] On the other hand, the cylindrical rechargeable battery 100 according to the embodiments of this disclosure is not limited to having the above-described structure, and can be applied to cylindrical rechargeable batteries having various structures including a top cover 141 and a safety vent 142.

[0054] Hereinafter, the cover assembly 140 included in the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure will be described in more detail with reference to the accompanying drawings.

[0055] Figure 3 It is shown Figure 1 A cross-sectional view of a cylindrical rechargeable battery. Figure 4 It is shown Figure 3 A cross-sectional view of the top cover, safety vent, and bottom cover of a cylindrical rechargeable battery.

[0056] Reference Figure 3 and Figure 4 The upper cover 141 included in the cover assembly 140 of the cylindrical rechargeable battery 100 according to embodiments of the present disclosure will be described in more detail. The upper cover 141 may include a coupling portion 141a, a protrusion 141b, and a connector 141c.

[0057] The joint 141a is joined to the safety vent 142. The joint 141a may be an edge portion of the cover 141. The edge portion of the safety vent 142, which will be described later, may be bent several times and joined to the joint 141a. The safety vent 142 and the joint 141a may be joined more firmly using welding or adhesive materials.

[0058] The protrusion 141b is located inside the joint 141a and can protrude outwards. The protrusion 141b can be the central part of the upper cover 141. The protrusion 141b can be arranged parallel to the joint 141a.

[0059] Connector 141c connects joint 141a and protrusion 141b. The vertical cross-sectional shape of the portion of connector 141c that connects to each of joint 141a and protrusion 141b can be circular.

[0060] On the other hand, in order to ensure sufficient space between the top cover 141 and the safety vent 142, the thickness T1 of the protrusion 141b can be made relatively thinner than the thickness T2 of the joint 141a.

[0061] Furthermore, in the top cover 141 as described above, the vertical distance D2 from the lowermost side of the joint 141a to the lower side of the protrusion 141b can be in the range of 1.3 mm to 1.4 mm. Therefore, even if the safety vent 142 deforms due to gas, sufficient space can be ensured between the top cover 141 and the safety vent 142.

[0062] Furthermore, if the safety vent deforms and comes into contact with the top cover, it may not deform sufficiently to cause a partial tear. Therefore, gas will not be released to the outside through the perforation in the top cover. Additionally, the top cover may deform when the safety vent comes into contact with it.

[0063] On the other hand, in the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure, sufficient space is ensured between the top cover 141 and the safety vent 142.

[0064] Gas generated inside the cylindrical rechargeable battery 100 causes the safety vent 142 to deform upwards through the penetration hole 144a of the lower cover 144. At this time, the safety vent 142 is electrically separated from the lower cover 144, and then a portion of the safety vent 142 is torn (opened), allowing gas to be released to the outside through the penetration hole 141e of the upper cover 141. At this time, the safety vent 142 does not interfere with the upper cover 141.

[0065] On the other hand, the cover 141 can be manufactured by a forging process, ensuring sufficient space between the cover 141 and the safety vent 142. Forging is a process of manufacturing metal using pressing or rolling, and the cover 141 can be manufactured by pressing a plate.

[0066] Reference Figure 5 When the top cover 141 is pressed by a press (not shown), the thickness of the protrusion 141b gradually decreases. Therefore, referring to the shape of the final vertical cross-section of the top cover 141, the thickness T1 of the protrusion 141b (see...) Figure 4 The thickness T2 formed is greater than that of the joint 141a (see...) Figure 4 The top cover 141 is relatively thin. Therefore, the connection between the top cover 141 and the safety vent 142 (see...) can be maximized. Figure 4 The space between ).

[0067] Figure 6 These are photographs of a cylindrical rechargeable battery according to an embodiment of the present disclosure, with some components removed for inspection.

[0068] Reference Figure 6 The distance D1 between the top of the cover 141 and the safety vent 142 can be in the range of 1.6mm to 1.8mm.

[0069] Figure 7 It is shown Figure 6 A photo of the safety vent of a cylindrical rechargeable battery deformed by internal gas.

[0070] like Figure 7 As shown, when the distance D1 between the top of the cover 141 and the safety vent 142 is in the range of 1.6 mm to 1.8 mm, even if the safety vent 142 is deformed, it can prevent the safety vent 142 from contacting the cover 141 (interfering with the cover 141).

[0071] Figure 8 This is a photograph showing the state of the safety vent of a cylindrical rechargeable battery, as illustrated in the comparative example, deformed due to internal gas.

[0072] like Figure 8 As shown, when the cylindrical rechargeable battery according to the comparative example is manufactured such that the distance between the top of the cover 141 and the safety vent 142 is less than 1.6 mm, the safety vent 142 may deform and interfere with the cover 141.

[0073] Although not shown in the accompanying drawings, the length of a cylindrical rechargeable battery may become excessive if it is manufactured such that the distance between the top of the cover and the safety vent is greater than 1.8 mm.

[0074] On the other hand, return to Figure 4 The safety vent 142 may include, for example, an vent contact portion 142a that contacts the top cover 141, a vent slope portion 142b that slopes downward from the vent contact portion 142a, a vent bottom 142c that extends from the vent slope portion 142b and is arranged parallel to the vent contact portion 142a, and a vent protrusion 142d that protrudes in one direction from the vent bottom 142c.

[0075] Here, the exhaust contact 142a can be bent multiple times to contact each of the lower surface, side surface, and upper surface of the upper cover 141. The exhaust bottom 142c can contact (be coupled to or connected to) the lower cover 144. Since this type of safety exhaust port 142 has already been described above, its detailed description will be omitted.

[0076] On the other hand, as described above, the distance between the protrusion 141b of the upper cover 141 and the exhaust protrusion 142d of the safety vent 142 can be in the range of 1.6 mm to 1.8 mm. Since the numerical limitation of the distance between the protrusion 141b and the exhaust protrusion 142d has been described above, its detailed description will be omitted.

[0077] On the other hand, in the assembly process of the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure, a pressing process can be performed. The pressing process is a finishing process for assembling a cylindrical rechargeable battery, which pressurizes a portion of the cylindrical rechargeable battery, including an insulating gasket 145 and various safety devices (PTC, safety vent, and current interruptor), seals the portion together with the can, and then presses the portion.

[0078] During the crimping process, a significant amount of pressure can be applied to the top cover 141. For example, the pressure applied to the top cover 141 can be approximately 10 kgf.

[0079] In the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure, the connector 141c of the upper cover 141 may have a thickness that increases from the protrusion 141b to the mating portion 141a. Furthermore, the radius of curvature R of the portion of the upper surface of the connector 141c adjacent to the mating portion 141a may exceed 0.5 mm.

[0080] In connector 141c, the portion adjacent to the mating portion 141a may experience relatively greater stress during the crimping process compared to other portions. In the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure, the thickness of the portion adjacent to the mating portion 141a at connector 141c is made relatively thick to prevent the top cover 141 from deforming due to stress.

[0081] Unlike the above, in the case of a rechargeable battery where the radius of curvature R of the portion of the upper surface of the connector 141c adjacent to the joint 141a is less than 0.5 mm, the upper cover 141 may deform during the crimping process. Here, the deformation of the upper cover 141 indicates that the portion of the joint 141a adjacent to the connector 141c is based on... Figure 4 The direction shown is downward curving.

[0082] In the rechargeable battery according to the comparative example, the radius of curvature R of the portion of the upper surface of the connector 141c of the upper cover 141 adjacent to the joint 141a is 0.4 mm, and the portion of the joint 141a of the upper cover 141 adjacent to the connector 141c is deformed by 1.01 mm.

[0083] Furthermore, in a rechargeable battery with a radius of curvature R of 0.3 mm on the upper surface of the connector 141c of the top cover 141 adjacent to the joint 141a, according to the comparative example, the portion of the joint 141a of the top cover 141 adjacent to the connector 141c is deformed by 1.2 mm.

[0084] On the other hand, in the rechargeable battery 100 according to the embodiment, the radius of curvature R of the portion of the upper surface of the connector 141c of the upper cover 141 adjacent to the joint portion 141a is 0.7 mm, and the portion of the joint portion 141a of the upper cover 141 adjacent to the connector 141c is deformed very slightly by 0.1 mm.

[0085] Furthermore, in the rechargeable battery 100 according to the embodiment, the radius of curvature R of the portion of the upper surface of the connector 141c of the upper cover 141 adjacent to the joint portion 141a is 1.03 mm, and the portion of the joint portion 141a of the upper cover 141 adjacent to the connector 141c is almost undeformed (deformation 0.05 mm).

[0086] As described above, the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure is configured such that the radius of curvature R of the portion of the upper surface of the connector 141c of the upper cover 141 adjacent to the mating portion 141a exceeds 0.5 mm. Therefore, the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure can prevent the upper cover 141 from deforming during the crimping process.

[0087] The cylindrical rechargeable battery 100 according to this disclosure ensures sufficient space between the top cover 141 and the safety vent 142. Therefore, the safety vent 142 can smoothly deform due to the gas inside the canister 110, and the gas can pass through the safety vent 142 and be discharged to the outside through the gas penetration hole. Furthermore, deformation of the safety vent 142 upon contact with the top cover can be prevented.

[0088] Furthermore, in the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure, the connector 141c of the top cover 141 may have a thickness that increases from the protrusion 141b to the mating portion 141a. Therefore, it is possible to prevent the top cover 141 from deforming due to stress during the crimping process.

[0089] Furthermore, the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure is configured such that the radius of curvature R of the portion of the upper surface of the connector 141c of the upper cover 141 adjacent to the mating portion 141a exceeds 0.5 mm. Therefore, the cylindrical rechargeable battery 100 according to an embodiment of the present disclosure can prevent the upper cover 141 from deforming during the crimping process.

[0090] While this disclosure has been described in conjunction with exemplary embodiments now considered practical, the accompanying drawings and detailed description of this disclosure described above are merely illustrative and are intended to describe the purpose of the invention only, and are not intended to limit the meaning or scope of the disclosure as disclosed in the appended claims. Therefore, those skilled in the art will understand that various modifications and other equivalent embodiments can be made based on this disclosure. Accordingly, the actual technical scope of this disclosure will be defined by the claims.

[0091] Explanation of symbols 100: Cylindrical rechargeable battery 110: Can 120: Electrode assembly 140: Cover component 141: Top Cover 141a: Joint 141b: Protrusion 141c: Connector 142: Safety vent.

Claims

1. A cylindrical rechargeable battery, said cylindrical rechargeable battery comprising: A can, including an internal space and having an opening; Electrode assembly, housed within the internal space of the tank; as well as The lid assembly is attached to the can and seals the opening. The cover assembly includes an upper cover and a safety vent located below the upper cover. The upper cover includes a connecting portion that engages with the safety vent, a protruding portion disposed on the inner side of the connecting portion and protruding outward, and a connector connecting the connecting portion and the protruding portion. The thickness of the protrusion is thinner than the thickness of the connector.

2. The cylindrical rechargeable battery according to claim 1, wherein, The distance between the top of the cover and the safety vent is in the range of 1.6 mm to 1.8 mm.

3. The cylindrical rechargeable battery according to claim 1, wherein, The vertical distance from the lowest side of the joint to the lower side of the protrusion is in the range of 1.3 mm to 1.4 mm.

4. The cylindrical rechargeable battery according to claim 1, wherein, The radius of curvature of the portion of the upper surface of the connector of the top cover adjacent to the joint exceeds 0.5 mm.

5. The cylindrical rechargeable battery according to claim 1, wherein, The thickness of the connector increases from the protrusion to the mating portion.

6. The cylindrical rechargeable battery according to claim 1, wherein, The safety vent includes: The exhaust contact portion contacts the upper cover; The exhaust inclined portion slopes downward from the exhaust contact portion; The exhaust bottom extends from the inclined exhaust portion and is arranged parallel to the exhaust contact portion; and An exhaust protrusion protrudes from the bottom of the exhaust in one direction.

7. The cylindrical rechargeable battery according to claim 5, wherein, The distance between the protrusion of the upper cover and the exhaust protrusion of the safety vent is in the range of 1.6 mm to 1.8 mm.

8. The cylindrical rechargeable battery according to claim 1, wherein, The connector of the top cover has one or more gas penetration holes.

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