Cylindrical secondary battery

Abstract

Disclosed is a cylindrical secondary battery in which an insulating member between a swaging terminal and a cylindrical can includes a protrusion protruding upward and / or downward therefrom, thereby preventing rotation of the swaging terminal. The cylindrical secondary battery may include: an electrode assembly including a positive electrode plate, a separator, and a negative electrode plate; a cylindrical can configured to accommodate the electrode assembly, electrically connected to the negative electrode plate, and including an open portion; a crimp terminal configured to be electrically connected to the positive electrode plate through an upper surface portion of the cylindrical can; an insulating member located between the cylindrical can and the staked terminal; and a cover plate configured to seal the open portion of the cylindrical can. The insulating member may include a protrusion formed on at least one surface of the insulating member facing the cylindrical can or the swaging terminal.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2024-0019860 filed in the Korean Intellectual Property Office on February 8, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiment relates to a cylindrical secondary battery. Background Art

[0004] Generally, a cylindrical secondary battery may include: a cylindrical electrode assembly including a positive electrode plate, a separator and a negative electrode plate; a cylindrical can housing the electrode assembly and an electrolyte, having an open lower end portion and electrically connected to the negative electrode plate; a riveted terminal passing through the upper surface of the cylindrical can and electrically connected to the positive electrode plate; and a cap assembly coupled to the lower end portion of the cylindrical can to seal the can and electrically connected to the electrode assembly to serve as an electrical connection element between an external device and the electrode assembly.

[0005] The information disclosed in this section is provided only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the relevant art. Summary of the Invention

[0006] Aspects of some embodiments provide a cylindrical secondary battery in which an insulating member positioned between a riveted terminal and a can includes a protrusion protruding upward and / or downward therefrom, thereby preventing rotation of the riveted terminal.

[0007] According to some embodiments, a cylindrical secondary battery includes: an electrode assembly including a positive electrode plate, a separator and a negative electrode plate; a cylindrical can configured to accommodate the electrode assembly and configured to be electrically connected to the negative electrode plate, wherein the cylindrical can includes an open portion; a riveted terminal configured to be electrically connected to the positive electrode plate through an upper surface portion of the cylindrical can; an insulating member located between the upper surface portion of the cylindrical can and the riveted terminal; and a cover plate configured to seal the open portion of the cylindrical can, wherein the insulating member includes a protrusion formed on at least one surface of the insulating member facing the cylindrical can or the riveted terminal.

[0008] The insulating member may include a first terminal hole formed therein and configured to allow the rivet terminal to pass therethrough.

[0009] The protrusion may be formed symmetrically with respect to the first terminal hole.

[0010] The protrusions may be formed on a lower surface and an upper surface of the insulating member facing the cylindrical can and the rivet terminal, respectively.

[0011] The protrusions may be formed on the lower surface and the upper surface of the insulating member, respectively facing the cylindrical can and the rivet terminal, so as to be misaligned with each other.

[0012] The protrusions may be formed on the lower and upper surfaces of the insulating member at predetermined angular intervals.

[0013] The protrusion may be formed asymmetrically with respect to the first terminal hole.

[0014] The protrusions may be provided in different numbers in regions symmetrical with respect to the first terminal hole.

[0015] The protrusion may have a rectangular planar shape, a circular planar shape, or a triangular planar shape.

[0016] The rivet terminal may include an outer portion exposed above the cylindrical can and an insertion portion extending from the outer portion into the cylindrical can.

[0017] The outer portion may include first projection recesses formed in a lower surface of the outer portion so as to allow the projections to be fitted into the first projection recesses, respectively.

[0018] The cylindrical can may include a second terminal hole formed in an upper surface portion of the cylindrical can and configured to allow the rivet terminal to pass therethrough.

[0019] The cylindrical can may include second projection recesses formed in the upper surface portion of the cylindrical can so as to allow the projections to be fitted into the second projection recesses, respectively.

[0020] The second protrusion recess may be formed symmetrically with respect to the second terminal hole.

[0021] A first gasket may be disposed between the rivet terminal and the second terminal hole.

[0022] The insulating member may be formed of at least one resin including perfluoroalkoxy (PFA) resin, polypropylene (PP) resin, or polybutylene terephthalate (PBT) resin.

[0023] The planar shape of the protrusion may be a V-shape bent at a predetermined angle.

[0024] A planar shape of the protrusion may be an arc shape of a circle concentric with the first terminal hole.

[0025] According to some embodiments, a method for manufacturing a cylindrical secondary battery includes: providing a cylindrical can configured to accommodate an electrode assembly and configured to be electrically connected to a negative electrode plate of the electrode assembly, wherein the cylindrical can includes an open portion; inserting the electrode assembly through the open portion of the cylindrical can; providing a riveted terminal configured to be electrically connected to a positive electrode plate of the electrode assembly through an upper surface portion of the cylindrical can; providing an insulating member between the cylindrical can and the riveted terminal, wherein the insulating member includes a protrusion formed on at least one surface of the insulating member facing the cylindrical can or the riveted terminal; and connecting a cover plate configured to seal the open portion of the cylindrical can to the cylindrical can.

[0026] The method may include fitting the protrusion into a first protrusion recess formed in a lower surface of an outer portion of the rivet terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings incorporated in this specification illustrate exemplary embodiments and are used to further illustrate the technical concept of the present disclosure in conjunction with the detailed description of the exemplary embodiments below, and the present disclosure should not be construed as being limited to the contents shown in these drawings. In the drawings:

[0028] Figure 1 is a cross-sectional view of a cylindrical secondary battery according to some embodiments;

[0029] Figure 2 is a diagram showing a method according to an embodiment of the present invention. Figure 1 A perspective view of an upper surface portion of a cylindrical can of a cylindrical secondary battery shown in FIG.

[0030] Figures 3A to 3C They are Figure 1 A side view, a top perspective view, and a bottom perspective view of an insulating member of a cylindrical secondary battery shown in FIG.

[0031] Figure 4 is a diagram showing a method according to another embodiment Figure 1 A perspective view of an upper surface portion of a cylindrical can of a cylindrical secondary battery shown in FIG.

[0032] Figure 5A and Figure 5B They are shown respectively Figure 4 A top perspective view and a bottom perspective view of an insulating member of a cylindrical secondary battery shown in FIG.

[0033] Figure 6 is a diagram showing a method according to another embodiment Figure 1 A perspective view of an upper surface portion of a cylindrical can of a cylindrical secondary battery shown in FIG; and

[0034] Figure 7A and Figure 7B They are shown respectively Figure 6 1 and 2 are top and bottom perspective views of an insulating member of a cylindrical secondary battery shown in FIG. DETAILED DESCRIPTION

[0035] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0036] The embodiments are provided to more fully illustrate the present disclosure to those skilled in the art, and the following embodiments may be modified in various other forms, and the scope of the present disclosure is not limited to the following embodiments. The embodiments are provided to make the present disclosure more complete and to fully convey the ideas of the present disclosure to those skilled in the art.

[0037] In the drawings, the thickness or size of each layer is exaggerated for convenience and clarity of description, and the same reference numerals in the drawings designate the same elements.

[0038] As used herein, the term "and / or" includes any one of the listed items and any combination of one or more of the listed items. As used herein, the term "connected" refers not only to a direct connection between component A and component B, but also to an indirect connection between component A and component B with component C interposed therebetween.

[0039] The terms used in the specification are intended to describe example embodiments and are not intended to limit the present disclosure. As used herein, singular forms may include plural forms unless the context clearly indicates otherwise. As used herein, the terms "include" and / or "comprise" are intended to clearly indicate the presence of the stated figures, numbers, steps, operations, components, elements and / or groups thereof, and do not exclude the presence or addition of one or more other figures, numbers, steps, operations, components, elements and / or groups thereof.

[0040] Although terms such as "first" and "second" are used herein to describe various members, components, regions, layers, and / or portions, the members, components, regions, layers, and / or portions are not limited by these terms. These terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Thus, a first member, component, region, layer, or portion described below may refer to a second member, component, region, layer, or portion without departing from the teachings of the present disclosure.

[0041] Spatially relative terms such as "below," "beneath," "below," "above," and "upper" may be used to help understand how one element or feature shown in the drawings differs from another element or feature. Spatially relative terms are intended to help understand the present disclosure in various processes or states of use and are not intended to limit the present disclosure. For example, if an element or feature in a figure is reversed, an element or feature described as "below" or "below" becomes "above" or "above." Therefore, "below" encompasses the concept of "above" or "below."

[0042] The preferred embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present disclosure pertains can easily practice the embodiments.

[0043] Throughout the specification, elements having similar configurations and operations are denoted by the same reference numerals.When an element is referred to as being electrically coupled to another element, the element may be directly coupled to the other element or indirectly coupled to the other element via one or more intervening elements.

[0044] As described herein, a cylindrical secondary battery may include: a cylindrical electrode assembly including a positive electrode plate, a separator, and a negative electrode plate; a cylindrical can housing the electrode assembly and an electrolyte, having an open portion (e.g., an open lower end portion) and electrically connected to the negative electrode plate; a riveted terminal passing through an upper surface portion of the cylindrical can and electrically connected to the positive electrode plate; and a cap assembly coupled to the lower end portion of the cylindrical can to seal the can and electrically connected to the electrode assembly to serve as an electrical connection element between an external device and the electrode assembly.

[0045] The riveted terminal and the insulating member can be assembled with the cylindrical can by compression molding. However, there may be a problem that the riveted terminal rotates due to low pressure.

[0046] Figure 1 is a cross-sectional view of a cylindrical secondary battery according to some embodiments. Figure 2 is a diagram showing a method according to an embodiment of the present invention. Figure 1 1 is a perspective view of an upper surface portion of a cylindrical can of a cylindrical secondary battery shown in FIG.

[0047] like Figure 1 and Figure 2 As shown in the figure, according to some embodiments, a cylindrical secondary battery 100 may include a cylindrical can 110, an electrode assembly 120 accommodated in the cylindrical can 110, a riveted terminal 150 connected to a second terminal hole 111a formed in one end of the cylindrical can 110, an insulating member 170 located between the cylindrical can 110 and the riveted terminal 150, and a cover plate 160 configured to seal an opening at the other end of the cylindrical can 110.

[0048] The cylindrical can 110 may include a circular upper surface portion 111 and a side surface portion 112 extending downward by a predetermined length from an edge of the upper surface portion 111. The upper surface portion 111 and the side surface portion 112 may be integrally formed with each other.

[0049] like Figure 2 As shown in FIG, the circular upper surface portion 111 may have a flat circular plate shape and may include a second terminal hole 111a formed through its central portion. The rivet terminal 150 may be coupled to the upper surface portion 111 in a manner inserted into the second terminal hole 111a. The second terminal hole 111a may be configured to allow the rivet terminal 150 to pass through. A first gasket 111b, such as for sealing and electrical insulation, may be interposed and / or disposed between the second terminal hole 111a and the rivet terminal 150. The first gasket 111b may electrically isolate the rivet terminal 150 and the cylindrical can 110 from each other by blocking contact between the rivet terminal 150 and the cylindrical can 110. The second terminal hole 111a in the upper surface portion 111 of the cylindrical can 110 may be sealed by the first gasket 111b. The first gasket 111b may be made of a resin such as polyethylene (PE), polypropylene (PP) or polyethylene terephthalate (PET). The cylindrical can 110 may include a second protrusion recess 111c formed in the upper surface portion 111 of the cylindrical can so as to allow the protrusions (e.g., lower protrusions 172b) formed on the insulating member 170 to be (e.g., respectively) fitted into the second protrusion recess 111c. The second protrusion recess 111c may be formed symmetrically with respect to the second terminal hole 111a.

[0050] During the process of manufacturing the cylindrical secondary battery 100, the lower portion of the cylindrical can 110 may be open. Therefore, during the process of manufacturing the cylindrical secondary battery 100, the electrode assembly 120 may be inserted into the cylindrical can 110 through the open lower portion of the cylindrical can 110 together with the electrolyte. In some embodiments, the electrolyte and the electrode assembly 120 may be inserted into the cylindrical can 110 with the open lower portion of the cylindrical can 110 oriented upward. After the electrolyte and the electrode assembly 120 are inserted into the cylindrical can 110, the cover plate 160 may be coupled to the open lower portion of the cylindrical can 110 to seal the interior of the cylindrical can 110. The electrolyte may be used to allow lithium ions to move between the positive electrode plate 121 and the negative electrode plate 122 that constitute the electrode assembly 120. The electrolyte may be a non-aqueous organic electrolyte that is a mixture of a lithium salt and a high-purity organic solvent. In other embodiments, the electrolyte may be a polymer using a polymer electrolyte or may be a solid electrolyte. However, the type of electrolyte is not limited thereto.

[0051] The cylindrical can 110 may be formed of steel, steel alloy, aluminum, aluminum alloy, or equivalents thereof. However, the material of the cylindrical can 110 is not limited thereto.

[0052] The electrode assembly 120 may include a positive electrode plate 121 coated with a positive electrode active material, a negative electrode plate 122 coated with a negative electrode active material, and a separator 123. The separator 123 is interposed between the positive electrode plate 121 and the negative electrode plate 122 to allow lithium ions to move between the positive electrode plate 121 and the negative electrode plate 122 while preventing an electrical short circuit between the positive electrode plate 121 and the negative electrode plate 122. After the positive electrode plate 121, the negative electrode plate 122, and the separator 123 are stacked, the electrode assembly 120 may be wound from a winding front end to have a generally cylindrical shape. In addition, the electrode assembly 120 may include a positive electrode uncoated portion protruding upward from the positive electrode plate 121 and a negative electrode uncoated portion protruding downward from the negative electrode plate 122. The positive electrode uncoated portion is not coated with the positive electrode active material, and the negative electrode uncoated portion is not coated with the negative electrode active material.

[0053] The positive electrode plate 121 may be configured such that a positive electrode active material such as a transition metal oxide is coated on at least one surface of the positive electrode plate, and the positive electrode plate 121 may be a plate-shaped metal foil made of aluminum (Al). The positive electrode plate 121 may be provided with a positive electrode uncoated portion at its upper end portion, on which the positive electrode active material is not coated. The positive electrode uncoated portion may protrude upward from the electrode assembly 120. For example, the positive electrode uncoated portion of the positive electrode plate 121 may protrude further upward than the negative electrode plate 122 and the separator 123.

[0054] The negative electrode plate 122 may be configured such that a negative electrode active material such as graphite or carbon is coated on at least one surface of the negative electrode plate, and the negative electrode plate 122 may be a plate-shaped metal foil made of copper (Cu) or nickel (Ni). The negative electrode plate 122 may be provided with a negative electrode uncoated portion at its lower end portion, on which the negative electrode active material is not coated. The negative electrode uncoated portion may protrude downward from the electrode assembly 120. The negative electrode uncoated portion of the negative electrode plate 122 may protrude further downward than the positive electrode plate 121 and the separator 123.

[0055] The separator 123 may be made of polyethylene (PE) or polypropylene (PP); however, the embodiment is not limited thereto. The separator 123 may prevent an electrical short circuit between the positive electrode plate 121 and the negative electrode plate 122 while allowing lithium ions to move between the positive electrode plate 121 and the negative electrode plate 122.

[0056] The positive electrode current collector 130 may be a circular metal plate having a shape corresponding to the upper surface of the electrode assembly 120. The planar size of the positive electrode current collector 130 may be equal to or smaller than the size of the upper surface of the electrode assembly 120. The positive electrode current collector 130 may be made of aluminum (Al). The positive electrode current collector 130 may be fixed and electrically connected to the positive electrode plate 121 that may be exposed to the upper surface of the electrode assembly 120 by welding, so that the lower surface of the positive electrode current collector 130 is in contact with the upper surface of the electrode assembly 120. The positive electrode current collector 130 may be fixed and electrically connected to the rivet terminal 150 by welding, so that the upper surface of the positive electrode current collector 130 is in contact with the lower surface of the rivet terminal 150. The positive electrode current collector 130 may serve as a channel for current flow between the positive electrode plate 121 of the electrode assembly 120 and the rivet terminal 150.

[0057] The negative electrode current collector 140 may include a circular flat portion corresponding to the lower surface of the electrode assembly 120 and an extension portion extending downward from the edge of the flat portion. The upper surface of the flat portion may contact the lower surface of the electrode assembly 120. The flat portion may be secured and electrically connected to the negative electrode plate 122, which may be exposed to the lower surface of the electrode assembly 120, by welding, such that the upper surface of the flat portion contacts the lower surface of the electrode assembly 120. The extension portion may be bent and may extend downward from the edge of the flat portion. A beaded portion 113 may be formed at the lower portion of the side surface portion 112 of the cylindrical can 110, and the negative electrode current collector 140 may be positioned below the beaded portion 113. The negative electrode current collector 140 may contact the inner surface of the beaded portion 113, and the end portion of the negative electrode current collector 140 may be located below the beaded portion 113. The negative electrode current collector 140 may be welded so as to contact the lower inner surface of the beaded portion 113 to secure and electrically connect to the cylindrical can 110. In some embodiments, before forming the crimped portion of the cylindrical can 110, in a state where the negative electrode current collector 140 is positioned below the beaded portion 113, welding between the extended portion and the beaded portion 113 may be performed in a direction from the extended portion toward the beaded portion 113. Thus, the negative electrode current collector 140 may serve as a passage for current flow between the negative electrode plate 122 of the electrode assembly 120 and the cylindrical can 110.

[0058] The rivet terminal 150 can be inserted into the second terminal hole 111a formed in the upper surface portion 111 of the cylindrical can 110 and can be electrically connected to the positive electrode current collector 130. The rivet terminal 150 can be made of a material that is the same as or similar to the material of the positive electrode current collector 130 or the positive electrode plate 121 (such as, but not limited to, aluminum (Al)). The rivet terminal 150 may include an outer portion 151 exposed above the cylindrical can 110 and an insertion portion 152 extending from the outer portion 151 to be located in the cylindrical can 110 (e.g., inside the cylindrical can 110). The rivet terminal 150 can be coupled to the second terminal hole 111a in the upper surface portion 111 of the cylindrical can 110 from the bottom to the top, and then the outer portion 151 of the rivet terminal 150 can be compressed and deformed (e.g., compression molding) by a process method such as pressing or spinning, so that it can be in close contact with the upper surface portion 111 of the cylindrical can 110. In other embodiments, after the rivet terminal 150 is inserted into the second terminal hole 111a from the interior of the cylindrical can 110, its outwardly protruding outer portion 151 can be deformed to have a diameter larger than the diameter of the second terminal hole 111a, so that it can be supported and fixed by the outer surface of the upper surface portion 111 of the cylindrical can 110. A first protrusion recess 151a can be formed in the lower surface of the outer portion 151, and the protrusion formed on the insulating member 170 can fit into the first protrusion recess 151a. In some embodiments, a plurality of first protrusion recesses can be included. A first gasket 111b can be interposed and / or disposed between the rivet terminal 150 and the second terminal hole 111a to perform electrical insulation and sealing between the rivet terminal 150 and the cylindrical can 110. In some embodiments, the rivet terminal 150 can be electrically connected to the positive electrode plate 121 of the electrode assembly 120 via the positive electrode current collector 130.

[0059] Figure 3A Example Figure 1 FIG. 1 is a side view of an insulating member of a cylindrical secondary battery shown in FIG. Figure 3B Example Figure 1 FIG. 1 is a top perspective view of an insulating member of a cylindrical secondary battery shown in FIG. Figure 3C Example Figure 1 FIG. 1 is a bottom perspective view of an insulating member of a cylindrical secondary battery shown in FIG.

[0060] like Figures 3A to 3C, the insulating member 170 may include a circular plate member 171 located between the upper surface portion 111 of the cylindrical can 110 and the riveted terminal 150, a first terminal hole 173 formed in the central area of the plate member 171, and a protrusion (e.g., an upper protrusion 172a and / or a lower protrusion 172b) formed on at least one surface of the plate member 171 facing the cylindrical can 110 or the riveted terminal 150. The protrusions may be formed on both the lower surface and the upper surface of the insulating member 170 facing the cylindrical can 110 and the riveted terminal 150, respectively. For example, the insulating member 170 may include an upper protrusion 172a and a lower protrusion 172b formed on its upper and lower surfaces, respectively, thereby fixedly coupling the riveted terminal 150 and the cylindrical can 110 to the upper and lower surfaces of the insulating member 170. The upper protrusion 172a and the lower protrusion 172b can be formed on the upper and lower surfaces of the insulating member 170 facing the rivet terminal 150 and the cylindrical can 110, respectively, and can be formed to be misaligned or offset from each other. In some embodiments, the upper protrusion 172a and the lower protrusion 172b can be arranged at a predetermined angular interval. Therefore, the rotation of the rivet terminal 150 inserted into the cylindrical can 110 can be prevented, thereby improving the airtightness between the components and the sealing inside the battery cell. In addition, the separation between the positive electrode current collector 130 and the rivet terminal 150 welded to the positive electrode current collector 130 can be prevented.

[0061] The insulating member 170 may include a first terminal hole 173 through which the rivet terminal 150 passes. The upper protrusion 172a and the lower protrusion 172b may be formed symmetrically with respect to the first terminal hole 173; however, the embodiment is not limited thereto. In some embodiments, the upper protrusion 172a and the lower protrusion 172b may be formed asymmetrically with respect to the first terminal hole 173. In other embodiments, the upper protrusion 172a and the lower protrusion 172b may be provided in different numbers in areas symmetrical with respect to the first terminal hole 173. The upper protrusion 172a and the lower protrusion 172b may have a rectangular planar shape, a circular planar shape, or a triangular planar shape.

[0062] The insulating member 170 may be formed of at least one resin selected from perfluoroalkoxy (PFA) resin, polypropylene (PP) resin, and polybutylene terephthalate (PBT) resin. In some embodiments, the insulating member may be formed of at least one resin including perfluoroalkoxy (PFA) resin, polypropylene (PP) resin, or polybutylene terephthalate (PBT) resin.

[0063] refer to Figure 1, the cap plate 160 may be a circular metal plate and may be coupled to the lower end portion of the cylindrical can 110. The cap plate 160 may be coupled to the lower end portion of the cylindrical can 110 with the second gasket 180 interposed therebetween, thereby preventing the cap plate 160 from being electrically connected to the cylindrical can 110. In some embodiments, the cap plate 160 may be an electrically non-polar component because it is not electrically connected to the positive electrode plate 121 or the negative electrode plate 122 of the electrode assembly 120.

[0064] The cover plate 160 may be fixed by forming a crimping portion at the lower end of the cylindrical can 110 so that the edge of the cover plate 160 is seated under the lower flat portion of the beaded portion 113 of the cylindrical can 110. The cover plate 160 may be seated on the beaded portion 113 in a state in which the open lower portion of the cylindrical can 110 faces upward.

[0065] The cap plate 160 may include at least one downwardly projecting protruding portion 161. For example, the protruding portion 161 of the cap plate 160 may be spaced apart from the central portion of the cap plate 160 and may protrude downwardly so as to have a ring-shaped shape when viewed in plan. In another example, the protruding portion 161 of the cap plate 160 may protrude downwardly so as to have multiple patterns. The protruding portion 161 of the cap plate 160 may be used to support the internal pressure in the cylindrical can 110. The lower surface of the protruding portion 161 of the cap plate 160 may be located at a higher position than the lower surface of the crimping portion of the cylindrical can 110. For example, the crimping portion of the cylindrical can 110 may protrude further downward than the protruding portion 161 of the cap plate 160. Therefore, if the cylindrical secondary battery 100 is placed on a flat surface, the crimping portion of the cylindrical can 110 may contact the surface, and the protruding portion 161 of the cap plate 160 may be spaced apart from the surface. Because the crimped portion of the cylindrical can 110 protrudes downward further than the protruding portion 161 of the cap plate 160, the cap plate 160 can be prevented from contacting the certain surface even when the cap plate 160 expands due to the internal pressure in the cylindrical can 110. Therefore, in some embodiments, the overall height of the cylindrical secondary battery 100 can be maintained even when the internal pressure in the cylindrical can 110 increases.

[0066] The cover plate 160 may include a notch 162 formed therein so as to open at a predetermined pressure. If the internal pressure in the cylindrical can 110 reaches a rupture pressure or higher, the notch 162 may rupture, thereby preventing the cylindrical secondary battery 100 from exploding. For example, if excessive internal pressure occurs in the cylindrical can 110, the notch 162 may rupture, thereby discharging the excessive internal pressure. The notch 162 in the cover plate 160 may be spaced apart from the central portion of the cover plate 160 and may be formed to have an annular shape when viewed in a plan view. In another example, the notch 162 may be formed to have a plurality of patterns. Embodiments are not limited to a specific shape of the notch 162.

[0067] The recess 162 may be formed to be spaced apart from the protruding portion 161. In some embodiments, the recess 162 may be formed in a recessed portion of the cover plate 160 that is recessed toward the cylindrical can 110 relative to the protruding portion 161, rather than in the protruding portion 161 of the cover plate 160. In some embodiments, since the cover plate 160 has a concave-convex structure due to the recessed portion and the protruding portion 161, the cover plate 160 can withstand the internal pressure in the cylindrical can 110 even when the internal pressure increases.

[0068] The second gasket 180 may be formed of a resin such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET), and may squeeze and seal between the cylindrical can 110 and the cap 160 and prevent the cap 160 from being separated from the cylindrical can 110.

[0069] Although the cylindrical secondary battery has been described above as being constructed so that the positive electrode (e.g., a positive electrode plate) is disposed on its upper surface and the negative electrode (e.g., a negative electrode plate) is disposed on its lower surface, the embodiment is not limited thereto. For example, the cylindrical secondary battery may be constructed so that both the negative electrode and the positive electrode are disposed on its upper surface. In an embodiment in which both the negative electrode and the positive electrode are disposed on the upper surface of the cylindrical secondary battery 100, if a plurality of cylindrical secondary batteries are electrically connected to each other via bus bars, the connection using the bus bars may be performed only on the upper surface of the cylindrical secondary battery, thereby simplifying the bus bar connection structure.

[0070] Hereinafter, another example of an insulating member in a cylindrical secondary battery according to another embodiment will be described. Figure 1 Describe the element.

[0071] Figure 4 is a diagram showing a method according to another embodiment Figure 1 1 is a perspective view of an upper surface portion of a cylindrical can of a cylindrical secondary battery shown in FIG. Figure 5A Example Figure 4FIG. 1 is a top perspective view of an insulating member of a cylindrical secondary battery shown in FIG. Figure 5B Example Figure 4 FIG. 1 is a bottom perspective view of an insulating member of a cylindrical secondary battery shown in FIG.

[0072] refer to Figure 5A and Figure 5B as well as Figure 4 , the insulating member may be (for example, as in Figure 1 ) is located between the upper surface portion 111 of the cylindrical can 210 and the rivet terminal 150, and may include a circular plate member 271, (eg, as described with respect to Figure 3B The first terminal hole 173 (described) is formed in the central area of the plate member 271 and a protrusion (e.g., an upper protrusion 272a and / or a lower protrusion 272b) is formed on at least one surface of the plate member 271 facing the cylindrical can 210 or the riveted terminal 150.

[0073] The protrusions may be formed on both the upper and lower surfaces of the insulating member facing the rivet terminal 150 and the cylindrical can 210, respectively. The upper protrusion 272a and the lower protrusion 272b may be formed on the upper and lower surfaces of the insulating member facing the rivet terminal 150 and the cylindrical can 210, respectively, and may be formed to be misaligned or offset from each other. In some embodiments, the upper protrusion 272a and the lower protrusion 272b may be arranged at predetermined angular intervals.

[0074] Each of the upper protrusion 272a and the lower protrusion 272b can be provided in pairs symmetrically relative to the first terminal hole 173. A pair of upper protrusions 272a can be formed on the left and right sides of the first terminal hole 173 and can have a V shape (for example, the planar shape can be a V shape). The V shape of the upper protrusion 272a can be a shape bent at a predetermined angle in the middle. Similar to the pair of upper protrusions 272a, the pair of lower protrusions 272b can also have a V shape and can be positioned to be misaligned or offset with the pair of upper protrusions 272a.

[0075] Due to the above-described shape of the protrusions, the upper protrusion 272a and the lower protrusion 272b can increase the contact area with the riveted terminal 150 and the cylindrical can 210. Therefore, if a rotational force is applied to the riveted terminal 150, the upper protrusion 272a and the lower protrusion 272b can effectively prevent the riveted terminal 150 from rotating, thereby improving the airtightness between the components and the sealing inside the battery cell.

[0076] Hereinafter, another example of an insulating member in a cylindrical secondary battery according to another embodiment will be described. Figure 1 Describe the element.

[0077] Figure 6is a diagram showing a method according to another embodiment Figure 1 1 is a perspective view of an upper surface portion of a cylindrical can of a cylindrical secondary battery shown in FIG. Figure 7A Example Figure 6 FIG. 1 is a top perspective view of an insulating member of a cylindrical secondary battery shown in FIG. Figure 7B Example Figure 6 FIG. 1 is a bottom perspective view of an insulating member of a cylindrical secondary battery shown in FIG.

[0078] refer to Figure 7A and Figure 7B as well as Figure 6 , the insulating member may be (for example, as in Figure 1 ) is located between the upper surface portion 111 of the cylindrical can 310 and the rivet terminal 150, and may include a circular plate member 371, (eg, as described with respect to Figure 3B The first terminal hole 173 (described above) formed in the central area of the plate member 371 and the protrusions (e.g., upper protrusions 372a and / or lower protrusions 372b) formed on at least one surface of the plate member 371 facing the cylindrical can 310 or the riveted terminal 150. The upper protrusions 372a and the lower protrusions 372b may be formed on the upper and lower surfaces of the insulating member facing the riveted terminal 150 and the cylindrical can 310, respectively, so as to be misaligned or offset from each other.

[0079] The upper protrusion 372a can be formed on each of the left and right sides of the first terminal hole 173 and can have an arc shape (for example, the planar shape can be an arc shape). For example, the arc shape of the upper protrusion 372a can be a partial arc shape of a circle concentric with the circular first terminal hole 173. Therefore, the upper protrusion 372a can also be formed in the shape of a circle concentric with the first terminal hole 173. Similar to the upper protrusion 372a, the lower protrusion 372b can also be formed in the shape of a partial arc shape of a circle concentric with the circular first terminal hole 173 and can be positioned so as not to be aligned with the upper protrusion 372a.

[0080] Due to the above-described shape of the protrusions, the upper protrusion 372a and the lower protrusion 372b can increase the contact area with the riveted terminal 150 and the cylindrical can 310 in the rotation direction. Therefore, if a rotational force is applied to the riveted terminal 150, the upper protrusion 372a and the lower protrusion 372b can effectively prevent the riveted terminal 150 from rotating, thereby improving the airtightness between the components and the sealing of the interior of the battery cell.

[0081] As apparent from the above description, in the cylindrical secondary battery according to the embodiment, the insulating member between the riveted terminal and the cylindrical can may include protrusions protruding upward and downward therefrom, thereby preventing rotation of the riveted terminal.

[0082] According to the embodiment, since the riveted terminal may be fixed so as not to rotate, airtightness between components and sealing of the interior of the battery cell may be improved.

[0083] According to some embodiments, a method for manufacturing a cylindrical secondary battery is provided, the method comprising: providing a cylindrical can configured to accommodate an electrode assembly and configured to be electrically connected to a negative electrode plate of the electrode assembly, wherein the cylindrical can includes an open portion; inserting the electrode assembly through the open portion of the cylindrical can; providing a riveted terminal configured to be electrically connected to a positive electrode plate of the electrode assembly through an upper surface portion of the cylindrical can; providing an insulating member between the cylindrical can and the riveted terminal, wherein the insulating member includes a protrusion formed on at least one surface of the insulating member facing the cylindrical can or the riveted terminal; and connecting a cover plate configured to seal the open portion of the cylindrical can to the cylindrical can.

[0084] According to some embodiments, the method may include fitting a protrusion into a first protrusion recess formed in a lower surface of an outer portion of the riveted terminal.

[0085] The above-mentioned embodiments are example embodiments for implementing an exemplary cylindrical secondary battery according to the present disclosure; therefore, the present disclosure is not limited to the above-mentioned embodiments, and it should be understood by those skilled in the art that various modifications can be made without departing from the spirit and scope of the present disclosure as claimed in the claims.

Claims

1. A cylindrical secondary battery comprising: an electrode assembly, comprising a positive electrode plate, a separator, and a negative electrode plate; a cylindrical can configured to house the electrode assembly and configured to be electrically connected to the negative electrode plate, wherein the cylindrical can includes an open portion; a riveted terminal configured to be electrically connected to the positive electrode plate through an upper surface portion of the cylindrical can; an insulating member positioned between the upper surface portion of the cylindrical can and the riveted terminal; as well as a cover plate configured to seal the open portion of the cylindrical can, The insulating member includes a protrusion formed on at least one surface of the insulating member facing the cylindrical can or the riveted terminal. 2 . The cylindrical secondary battery according to claim 1 , wherein the insulating member includes a first terminal hole formed therein and configured to allow the rivet terminal to pass therethrough. 3 . The cylindrical secondary battery according to claim 2 , wherein the protrusion is formed symmetrically with respect to the first terminal hole. 4 . The cylindrical secondary battery according to claim 2 , wherein the protrusions are formed on a lower surface and an upper surface of the insulating member facing the cylindrical can and the rivet terminal, respectively. 5 . The cylindrical secondary battery according to claim 2 , wherein the protrusions are formed on lower and upper surfaces of the insulating member facing the cylindrical can and the rivet terminal, respectively, so as to be misaligned with each other. 6 . The cylindrical secondary battery according to claim 2 , wherein the protrusions are formed on the lower and upper surfaces of the insulating member at predetermined angular intervals. 7 . The cylindrical secondary battery according to claim 2 , wherein the protrusion is formed asymmetrically with respect to the first terminal hole. 8 . The cylindrical secondary battery according to claim 2 , wherein the protrusions are provided in different numbers in regions symmetrical with respect to the first terminal hole. 9 . The cylindrical secondary battery according to claim 2 , wherein the protrusion has a rectangular planar shape, a circular planar shape, or a triangular planar shape.

10. The cylindrical secondary battery according to claim 1, wherein the riveted terminal comprises: an outer portion exposed above the cylindrical tank; and An insert portion extends from the outer portion into the cylindrical can. 11 . The cylindrical secondary battery according to claim 10 , wherein the outer portion includes first protrusion recesses formed in a lower surface of the outer portion so as to allow the protrusions to be fitted into the first protrusion recesses, respectively. 12 . The cylindrical secondary battery according to claim 10 , wherein the cylindrical can comprises a second terminal hole formed in an upper surface portion of the cylindrical can and configured to allow the rivet terminal to pass therethrough. 13 . The cylindrical secondary battery according to claim 12 , wherein the cylindrical can includes second projection recesses formed in the upper surface portion of the cylindrical can so as to allow the projections to be fitted into the second projection recesses, respectively. 14 . The cylindrical secondary battery according to claim 13 , wherein the second convex-concave portion is formed symmetrically with respect to the second terminal hole. 15 . The cylindrical secondary battery according to claim 12 , further comprising a first gasket disposed between the riveted terminal and the second terminal hole. 16 . The cylindrical secondary battery according to claim 1 , wherein the insulating member is formed of at least one resin including a perfluoroalkoxy resin, a polypropylene resin, or a polybutylene terephthalate resin. 17 . The cylindrical secondary battery according to claim 1 , wherein a planar shape of the protrusion is a V shape bent at a predetermined angle. 18 . The cylindrical secondary battery according to claim 1 , wherein a planar shape of the protrusion is an arc shape of a circle concentric with the first terminal hole.

Images