Cylindrical secondary battery

Abstract

Provided is a cylindrical secondary battery, the cylindrical secondary battery including: an electrode assembly; a cylindrical can accommodating the electrode assembly; and a terminal portion including a crimp terminal coupled to one side of the can in the longitudinal direction and electrically connected to the electrode assembly, and at least one insulator between the can and the crimp terminal to insulate the can and the crimp terminal from each other. The battery also includes an anti-rotation portion on the can and / or the terminal portion. Since a structure for preventing rotation of the swaging terminal is provided on an upper surface portion, a swaging head portion, or a swaging body to which the swaging terminal of the can is fastened, the swaging terminal does not rotate due to an external force or vibration. Accordingly, stability and reliability of the secondary battery may be improved.

Description

[0001] This application claims priority to and the benefit of Korean Patent Application No. 10-2023-0074063 filed in the Korean Intellectual Property Office on June 9, 2023, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0002] Embodiments of the present disclosure relate to a cylindrical secondary battery having an improved terminal structure. Background Art

[0003] Generally, a cylindrical secondary battery includes a cylindrical electrode assembly, a cylindrical can accommodating the electrode assembly and an electrolyte, and a cap assembly sealing the can. The cap assembly is electrically connected to the electrode assembly and the outside of the secondary battery.

[0004] In a battery module that uses a plurality of cylindrical secondary batteries by modularizing them, bus bars are connected to the upper and lower terminals of the secondary batteries, respectively. Therefore, there is a problem that the battery module may have a complex structure and the manufacturing process time may be prolonged. In order to solve these problems, a secondary battery having a structure in which a positive electrode terminal in a riveted form is provided on the side of the can facing the cover assembly may be used. When a riveted terminal is applied, there is a risk that the head or body of the rivet may rotate due to external force or vibration. Therefore, a solution is needed to prevent these problems.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the invention and therefore it may contain information that does not constitute the prior art. Summary of the invention

[0006] Embodiments of the present disclosure provide a cylindrical secondary battery having an improved terminal structure.

[0007] A secondary battery according to an embodiment of the present disclosure includes: an electrode assembly; a can accommodating the electrode assembly; and a terminal portion including a riveted terminal coupled to one side of the can in a longitudinal direction and electrically connected to the electrode assembly and at least one insulator between the can and the riveted terminal to insulate the can and the riveted terminal from each other. The secondary battery also includes an anti-rotation portion on at least one of the can and the terminal portion.

[0008] The can may include a circular upper surface portion through which a terminal hole into which the rivet terminal is inserted is formed, and the rivet terminal may include a head disposed outside the upper surface portion and a body inserted into the terminal hole and disposed inside the can.

[0009] The first anti-rotation portion may be formed on the upper surface portion.

[0010] The first anti-rotation portion may be formed by laser engraving.

[0011] The first anti-rotation portion may be a pattern formed by at least one of a dotted line, a straight line, a curved line, and a figure.

[0012] The rivet terminal may include a second anti-rotation portion formed on a surface of the head portion facing the upper surface portion.

[0013] The second anti-rotation portion may be at least one of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

[0014] The rivet terminal may include a third anti-rotation portion formed on an outer peripheral surface of the body.

[0015] The third anti-rotation portion may be at least one of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

[0016] The first to third anti-rotation portions may be provided in combination of two or more.

[0017] At least one protrusion may be formed to protrude on one of the insulator and the rivet terminal, and a receiving groove for receiving the protrusion may be formed on the other.

[0018] In addition, a cylindrical secondary battery according to an embodiment of the present disclosure may include: an electrode assembly, including a first electrode plate, a second electrode plate and a separator disposed between the first electrode plate and the second electrode plate; a can, having a circular upper surface portion through which a terminal hole is formed and a side portion extending downward from the upper surface portion, and accommodating the electrode assembly; and a terminal portion, including a riveted terminal inserted into the terminal hole and electrically connected to the first electrode plate and a plurality of insulators that insulate the riveted terminal from the upper surface portion, wherein an anti-rotation portion may be provided on at least one of the can and the terminal portion.

[0019] The rivet terminal may include a head disposed on an outer portion of the upper surface portion and a body inserted into the terminal hole and disposed inside the can.

[0020] The first anti-rotation portion may be formed on the upper surface portion.

[0021] The first anti-rotation portion may be formed by laser engraving.

[0022] The first anti-rotation portion may be a pattern formed by at least one of a dotted line, a straight line, a curved line, and a figure.

[0023] The rivet terminal may include a second anti-rotation portion formed on a surface of the head portion facing the upper surface portion.

[0024] The second anti-rotation portion may be at least one of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

[0025] The rivet terminal may include a third anti-rotation portion formed on an outer peripheral surface of the body.

[0026] The third anti-rotation portion may be at least one of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

[0027] The first to third anti-rotation portions may be provided in combination of two or more.

[0028] At least one protrusion may be formed to protrude on one of the insulator and the rivet terminal, and a receiving groove for receiving the protrusion may be formed on the other.

[0029] The cylindrical secondary battery may further include a first electrode collector plate interposed between the riveted terminal and the electrode assembly and electrically connected to the first electrode plate; and a second electrode collector plate disposed adjacent to one end of the side portion and electrically connected to the second electrode plate and the side portion.

[0030] The cylindrical secondary battery may further include a cap assembly that is insulated from the can while being coupled to the side.

[0031] The side portion may include a beading portion concavely formed in an upper side of the cap assembly and a crimping portion formed by bending a lower end of the side portion inwardly, and the cap assembly may be disposed between the beading portion and the crimping portion.

[0032] The cover assembly may include a cover plate sealing the side portion and a gasket interposed between the cover plate and the side portion.

[0033] An edge of the second electrode current collector plate may be interposed between the beaded portion and the gasket, and may be in contact with the beaded portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a perspective view of a secondary battery according to an embodiment of the present disclosure.

[0035] Figure 2 is based on Figure 1 A cross-sectional view of a cylindrical secondary battery.

[0036] Figure 3 It shows that according to Figure 2 A partial cross-sectional view of the terminal structure.

[0037] Figure 4 It shows that according to Figure 2 A partial perspective view of the terminal structure.

[0038] Figures 5 to 10 is a plan view showing an upper surface of a can according to various embodiments of the present disclosure.

[0039] Figures 11 to 13 is a perspective view illustrating a lower surface of a head of a riveting terminal according to various embodiments of the present disclosure.

[0040] Fig.14is a perspective view showing a main body of a rivet terminal according to an embodiment of the present disclosure.

[0041] Fig.15 is a partial cross-sectional view showing a terminal structure according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0042] The examples of the present disclosure are provided to more completely explain the present disclosure to those skilled in the art, and the following examples may be modified in various other forms. However, the present disclosure may be implemented in many different forms and should not be construed as being limited to the examples (or exemplary) embodiments set forth herein. On the contrary, these example embodiments are provided so that the present disclosure will be thorough and complete, and will convey aspects and features of the present disclosure to those skilled in the art.

[0043] In addition, in the accompanying drawings, the size or thickness of various components is exaggerated for simplicity and clarity. The same reference numerals always refer to the same elements. As used herein, the term "and / or" includes any combination and all combinations of one or more of the relevant listed items. In addition, it will 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 there may be an intervening element C between element A and element B so that element A and element B are indirectly connected to each other.

[0044] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the disclosure. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. It will also be understood that when the term "comprises or includes" and / or its variations are used in this specification, the stated features, quantities, steps, operations, elements and / or components are indicated, but the presence or addition of one or more other features, quantities, steps, operations, elements, components and / or groups thereof is not excluded.

[0045] It will be understood that, although the terms first, second, etc. can 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 only used to distinguish one component, element, region, layer and / or part from another component, element, region, layer and / or part. Therefore, for example, without departing from the teachings of the present disclosure, the first component, first element, first region, first layer and / or first part discussed below can be named as the second component, second element, second region, second layer and / or second part.

[0046] For ease of description, spatially relative terms such as "under", "below", "below", "above", "on", etc. may be used herein to describe the relationship of one element or feature to another element or features as shown in the figures. It will be understood that in addition to the orientation shown in the figures, the spatially relative terms are also intended to cover different orientations of the device in use or operation. For example, if the elements or features in the figures are flipped, the elements described as "under" or "beneath" other elements or features will be oriented as "on" or "above" the other elements or features. Therefore, the exemplary term "under" can cover both above and below orientations.

[0047] Hereinafter, a cylindrical secondary battery according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0048] First, refer to Figures 1 to 4 Describe the basic structure of a cylindrical secondary battery.

[0049] Figure 1 is a perspective view of a secondary battery according to an embodiment of the present disclosure. Figure 2 is based on Figure 1 A cross-sectional view of a cylindrical secondary battery. Figure 3 It shows that according to Figure 2 A partial cross-sectional view of the terminal structure. Figure 4 It shows that according to Figure 2 A partial perspective view of the terminal structure.

[0050] like Figure 1 and Figure 2 As shown in the figure, a secondary battery 10 (e.g., a cylindrical secondary battery 10) according to an embodiment of the present disclosure may include a can 100 (e.g., a cylindrical can), an electrode assembly 200 accommodated inside the can 100, a first electrode collector plate 300, a second electrode collector plate 400, a terminal portion 500 disposed on one side of the can 100, and a cover assembly 600 disposed on the other side of the can 100.

[0051] like Figure 1 As shown in FIG. 1 , the can 100 may include a circular upper surface portion 110 and a cylindrical side portion 130 extending downward from the upper surface portion 110. Since the lower side of the side portion 130 is open, the can 100 is shaped like a cylinder having an open lower end.

[0052] Terminal hole 111 (see Figures 5 to 10 ) may be formed through the center of the upper surface portion 110. A portion of the terminal portion may be exposed to the outside of the secondary battery 10 through the terminal hole 111. A structure for preventing rotation of a riveted terminal to be described later may be provided on the upper surface portion 110, which structure will be described later.

[0053] The upper end of the side portion 130 is connected to the upper surface portion 110. In one or more embodiments, the upper surface portion 110 and the side portion 130 are formed integrally. The lower end of the side portion 130 is open, and the cap assembly 600 is disposed at the open end. The curling portion 132 may be formed adjacent to the bottom of the side portion 130. The curling portion 132 may be formed inwardly and concavely from the side portion 130. The end of the side portion 130 spaced apart from the curling portion 132 (lower than the curling portion 132) may be bent toward the inside of the can 100 to form a crimping portion 134. The curling portion 132 is configured to prevent the electrode assembly 200 from separating. The cap assembly 600 may be between the curling portion 132 and the crimping portion 134. The crimping portion 134 may seal the can 100 by fixing the cap assembly 600.

[0054] The can 100 having the above structure may be made of steel, steel alloy, aluminum, aluminum alloy or equivalents thereof, but the material is not limited thereto. The electrode assembly 200, the first electrode collector plate 300, and the second electrode collector plate 400 are accommodated in the can 100 together with the electrolyte.

[0055] like Figure 2 As shown in , the electrode assembly 200 may be configured such that the first electrode plate 210, the second electrode plate 220, and the separator 230 disposed between the first electrode plate 210 and the second electrode plate 220 are wound into a cylindrical shape. In the present embodiment, the first electrode plate 210 may be a positive electrode plate, and the second electrode plate 220 may be a negative electrode plate. However, the opposite is also possible (i.e., the first electrode plate 210 may be a negative electrode plate, and the second electrode plate 220 may be a positive electrode plate).

[0056] In the first electrode plate 210, the positive electrode active material layer may be formed on at least one surface of the aluminum (Al) foil by coating or the like. As an example, the positive electrode active material layer may be a transition metal oxide (e.g., LiCoO2, LiNiO2, LiMn2O4, etc.). The first electrode uncoated portion in which the positive electrode active material layer is not formed may be disposed at the upper portion of the first electrode plate 210. A plurality of first electrode substrate tabs may be formed by cutting the first electrode uncoated portion into a specific shape by slotting or the like. In the present embodiment, the first electrode substrate tab may be at or near the upper surface portion 110 of the can 100. In addition, the first electrode substrate tab may be electrically connected to the first electrode collector plate 300. As an example, the first electrode substrate tab may be bent in one direction and then bonded to the first electrode collector plate 300 by welding, which will be described in detail later.

[0057] In the second electrode plate 220, a negative electrode active material layer may be formed by coating at least one surface of a copper (Cu) or nickel (Ni) foil. As an example, the negative electrode active material layer may be graphite, carbon, etc. The second electrode uncoated portion in which the negative electrode active material layer is not formed may be disposed at the lower portion of the second electrode plate 220. A plurality of second electrode substrate tabs may be formed by cutting the second electrode uncoated portion into a specific shape via slotting, etc. In the present embodiment, the second electrode substrate tab may be at or near the lower side of the can 100. In addition, the second electrode substrate tab may protrude downward from the diaphragm 230 and may be electrically connected to the second electrode collector plate 400. Some portions of the second electrode substrate tab may be electrically connected to the curling portion 132 of the can 100. As an example, the second electrode substrate tab may be bent in one direction and then bonded to the second electrode collector plate 400 by welding.

[0058] The separator 230 may be polyethylene (PE) or polypropylene (PP), but the material of the separator 230 is not limited thereto. The separator 230 may prevent an electrical short circuit between the first electrode plate 210 and the second electrode plate 220 and allow only the movement of lithium ions. The separator 230 may have a length sufficient to contact the first electrode collector plate 300 based on the longitudinal direction of the electrode assembly 200, which will be described in detail later.

[0059] The electrode assembly 200 having the above-described structure is electrically connected to the first electrode collector plate 300 and the second electrode collector plate 400 , and is electrically connected to the terminal part 500 and the can 100 , respectively.

[0060] like Figure 2 As shown in , the first electrode collector plate 300 has a circular plate shape and may be made of the same material as the first electrode plate 210. As an example, the first electrode collector plate 300 may be made of aluminum or an aluminum alloy. The diameter of the first electrode collector plate 300 may be smaller than the diameter of the can 100. The smaller diameter is configured to prevent the first electrode collector plate 300 from being electrically connected to the can 100. The first electrode collector plate 300 may be welded in a configuration in which its lower surface is in contact with the first electrode substrate tab. Therefore, the first electrode collector plate 300 and the first electrode plate 210 may be electrically connected. In addition, the upper surface of the first electrode collector plate 300 may be welded to the riveted terminal 510 of the terminal portion 500 to be described later. Therefore, the first electrode collector plate 300 and the riveted terminal 510 may be electrically connected. Therefore, the first electrode plate 210 and the riveted terminal 510 may be electrically connected through the first electrode collector plate 300. That is, the first electrode current collector plate 300 becomes a path for current to flow between the first electrode plate 210 and the rivet terminal 510 .

[0061] like Figure 2As shown in , the second electrode collector plate 400 may include a plate surface portion 410 having a circular plate shape and a contact portion 420 extending from the plate surface portion 410. In one or more embodiments, the contact portion 420 is an edge region of the second electrode collector plate 400. The upper surface of the plate surface portion 410 may be welded in a configuration in which it contacts the second electrode substrate tab. Therefore, the second electrode collector plate 400 and the second electrode plate 220 may be electrically connected. To this end, the second electrode collector plate 400 may be made of the same material as the second electrode plate 220. As an example, the second electrode collector plate 400 may be made of copper. In the present embodiment, the contact portion 420 may extend downward from the edge (e.g., the peripheral edge) of the plate surface portion 410. The contact portion 420 may be in close contact with the inner surface of the curling portion 132. To this end, the contact portion 420 may have a curved profile corresponding to the curved profile of the curling portion 132. As an example, the contact portion 420 may be welded and electrically connected to the curling portion 132. However, the second electrode current collector plate 400 is not electrically connected to the cap assembly 600 .

[0062] In addition, if Figures 1 to 4 As shown in , the terminal part 500 may include a riveted terminal 510 and a plurality of insulators 520 , 530 , 540 for insulating the riveted terminal 510 .

[0063] The riveted terminal 510 is inserted into a terminal hole 111 formed in the upper surface portion 110 of the can 100. The riveted terminal 510 is electrically connected to the first electrode plate 210 through the first electrode current collector plate 300. The riveted terminal 510 is a terminal that is bonded to the upper surface portion 110 of the can 100 by a riveting method. The riveted terminal 510 can be inserted into the terminal hole 111 from the outside of the can 100 toward the inside. In one or more embodiments, one end of the riveted terminal 510 is outside the can 100, and the other end of the riveted terminal 510 is inside the can 100. One end of the riveted terminal 510 outside the can 100 has a hollow circular plate shape and is referred to as a head 512. The other end of the riveted terminal 510 is shaped as a hollow cylinder and is referred to as a body 514. The cylindrical body 514 is mechanically pressed and deformed into an approximate circular plate shape (the shape of the deformed body 514 is Figure 4 ). In the head 512 and the body 514 of the riveted terminal 510, a structure for preventing rotation may be provided, which will be described later. When the riveted terminal 510 is coupled to the tank 100, the first to third insulators 520 to 540 are inserted between the riveted terminal 510 and the upper surface portion 110 of the tank 100 to insulate the tank 100 and the riveted terminal 510 from each other. In a configuration in which the riveted terminal 510 is inserted into the terminal hole 111, the inner end of the riveted terminal 510 is compressed and deformed by a riveting process such as pressing or spinning. Therefore, the riveted terminal 510 may be in close contact with the upper surface portion 110 of the tank 100.

[0064] As an example, the insulator may include a first insulator 520, a second insulator 530, and a third insulator 540. The first insulator 520, the second insulator 530, and the third insulator 540 may be used without limitation in type or kind as long as they are made of insulating material.

[0065] The first insulator 520 is between the outer end (eg, the head 512) of the rivet terminal 510 and the upper surface portion 110. For example, the first insulator 520 may have a hollow circular plate shape. The diameter of the first insulator 520 may be greater than the diameter of the outer end of the rivet terminal 510.

[0066] The second insulator 530 may be shaped to surround the terminal hole 111 formed in the upper surface part 110. That is, regarding the terminal hole 111, the second insulator 530 may be shaped to surround the outer and inner surfaces of the upper surface part 110 and the cross section where the terminal hole 111 is formed.

[0067] The third insulator 540 is shaped as a hollow circular plate and is between the inner surface of the upper surface portion 110 and the inner end of the rivet terminal 510 .

[0068] Figure 3 The terminal structure in a configuration in which the rivet terminal 510 faces the upper side of the secondary battery 10 is shown. Figure 4 The terminal structure in a configuration in which the rivet terminal 510 faces the lower side of the secondary battery 10 is shown.

[0069] Reference Figure 3 and Figure 4 , the third insulator 540 is shaped as an approximately circular plate and has a predetermined thickness. The third insulator 540 may include a terminal contact portion 541 in contact with the riveted terminal 510, a collector plate contact portion 543 in contact with the first electrode collector plate 300, and an upper contact portion 545 in contact with the upper surface portion 110. The terminal contact portion 541 and the collector plate contact portion 543 are connected by a first inclined portion 542. The collector plate contact portion 543 and the upper contact portion 545 are connected by a second inclined portion 544. That is, the terminal contact portion 541, the collector plate contact portion 543, and the upper contact portion 545 have steps or slopes relative to each other. The terminal contact portion 541, the first inclined portion 542, the collector plate contact portion 543, the second inclined portion 544, and the upper contact portion 545 are all formed integrally. A plurality of groove portions 546 are formed on the collector plate contact portion 543 (see Figure 4 ).

[0070] The terminal contact portion 541 is a circular area having a diameter larger than the inner end diameter of the rivet terminal 510. A terminal hole into which the rivet terminal 510 is inserted is formed in the center of the terminal contact portion 541. Figure 3 When viewed in the embodiment depicted in FIG. 1 , the terminal contact portion 541 is in close contact with the inner surface of the upper surface portion 110. The riveted terminal 510 is combined in a configuration in which the terminal contact portion 541 is in close contact with the upper surface portion 110. The inner end of the riveted terminal 510 is deformed so that the terminal contact portion 541 can be in closer contact with the upper surface portion 110. The first inclined portion 542 is connected to the terminal contact portion 541. The collector plate contact portion 543 is connected to the edge of the first inclined portion 542.

[0071] The collector plate contact portion 543 is a portion occupying most of the area of ​​the third insulator 540. The collector plate contact portion 543 has a circular plate shape, and the terminal contact portion 541 is formed at the center of the collector plate contact portion 543. Figure 3 In the embodiment shown in , the collector plate contact portion 543 is positioned at a lower side at a certain distance from the upper surface portion 110. The collector plate contact portion 543 has a step H with the terminal contact portion 541. Figure 4 As shown in , the groove portion 546 is substantially fan-shaped and may be formed on the collector plate contact portion 543. The groove portion 546 may be formed concavely from the surface in the direction of the first electrode collector plate 300. The groove portion 546 is provided to reduce the weight of the third insulator 540, and the groove portion 546 may be omitted in some embodiments. The second inclined portion 544 is connected to the edge of the collector plate contact portion 543. The upper contact portion 545 is connected to the edge of the second inclined portion 544.

[0072] When viewed as a whole, the upper contact portion 545 is a region corresponding to the outer edge of the third insulator 540. Figure 3 In the embodiment shown in , the upper contact portion 545 contacts the inner surface of the upper surface portion 110. Therefore, the upper surface of the upper contact portion 545 can be positioned on the same line (or plane) as the upper surface of the terminal contact portion 541. In addition, the upper contact portion 545 has a width smaller than that of the terminal contact portion 541 or the collector plate contact portion 543. In one or more embodiments, the edge of the third insulator 540 may be formed with the second inclined portion 544 without the upper contact portion 545.

[0073] In one or more embodiments, Figure 3As shown in , the step H between the terminal contact portion 541 and the collector plate contact portion 543 is the height between the lower surface of the terminal contact portion 541 and the lower surface of the collector plate contact portion 543. The step H between the terminal contact portion 541 and the collector plate contact portion 543 is configured to provide an installation space for the riveted terminal 510. To this end, a step H is provided between the terminal contact portion 541 and the collector plate contact portion 543. However, if the step H between the terminal contact portion 541 and the collector plate contact portion 543 is too large (i.e., if the collector plate contact portion 543 is positioned too far downward), the collector plate contact portion 543 presses the first electrode collector plate 300 toward the electrode assembly 200. Then, the electrode assembly 200 is pressed, resulting in deformation. In order to prevent this, the step H between the terminal contact portion 541 and the collector plate contact portion 543 can be set to be equal to or less than the raised height of the riveted terminal 510. As used herein, the raised height of the riveted terminal 510 refers to the raised height of the first electrode collector plate 300 based on the electrode assembly 200. Figure 3 The thickness measured from the lower surface of the terminal contact portion 541 to the lower end (lowest part, regardless of position) of the riveted terminal 510 (i.e., the thickness of the circular plate in which the main body 514 of the riveted terminal is deformed). Even if the step H between the terminal contact portion 541 and the collector plate contact portion 543 is less than the protrusion height of the riveted terminal 510, the step H is preferably not greater than 0.5 mm. If the step H is too large, the riveted terminal 510 is prevented from contacting the first electrode collector plate 300.

[0074] One end of the second insulator 530 may be in close contact with the inner side of the hollow side of the first insulator 520. The other end of the second insulator 530 may be in close contact with the inner side of the hollow side of the third insulator 540. In one or more embodiments, the first insulator 520, the second insulator 530, and the third insulator 540 may be integrally formed.

[0075] On the opposite side of the upper surface part 110 where the terminal part 500 having the above-described structure is provided, the cap assembly 600 is provided (ie, the cap assembly 600 and the terminal part 500 are at opposite ends of the can 100 ).

[0076] like Figure 2 As shown in FIG. 6 , the cap assembly 600 may include a cap plate 610 for sealing the can 100 and a gasket 620 for insulating the can 100 and the cap plate 610 from each other.

[0077] The cap plate 610 may include a planar portion 612 having a circular plate shape, an inclined surface 614 connected to the planar portion 612, and an extended surface 616 connected to the inclined surface 614 (ie, the inclined surface 614 connects the planar portion 612 to the extended surface 616). The planar portion 612 may be approximately parallel to the second electrode current collector plate 400. The inclined surface 614 may extend downward from the edge of the planar portion 612 and tilt outward. The extended surface 616 extends from the edge of the inclined surface 614 and may be parallel to (or approximately parallel to) the planar portion 612. The extended surface 616 may be surrounded by a gasket 620 and between the crimping portion 132 and the crimping portion 134. A notch 612a may be formed on the planar portion 612. When the pressure inside the secondary battery 10 is higher than a certain pressure, the notch 612a may rupture. When the notch 612a ruptures, the gas inside the secondary battery 10 may be discharged. That is, the notch 612a serves as an exhaust port.

[0078] The gasket 620 is between the lower portion of the curling portion 132 and the crimping portion 134, and may cover the extended surface 616 of the cover plate 610. The gasket 620 may cover part or all of the extended surface 616. The side where the gasket 620 contacts the extended surface 616 may be defined as the inner side, and the side where the gasket 620 contacts the curling portion 132 may be defined as the outer side. In one or more embodiments, a portion of the contact portion 420 of the second electrode collector plate 400 may be between the outer upper portion of the gasket 620 and the curling portion 132. Therefore, the contact portion 420 of the second electrode collector plate 400 and the extended surface 616 of the cover plate 610 do not contact each other. That is, the gasket 620 may insulate the cover plate 610 and the can 100 from each other, and may insulate the cover plate 610 and the second electrode collector plate 400 from each other.

[0079] By the above configuration, the rivet terminal 510 may have positive polarity, and the can 100 may have negative polarity. Therefore, both the positive rivet terminal 510 of positive polarity and the negative upper surface portion 110 of negative polarity may be provided on the upper side of the can 100.

[0080] Furthermore, the cylindrical secondary battery of the present disclosure may include a structure for preventing the riveted terminal from rotating in the direction of the plate surface of the upper surface portion of the can.

[0081] Figures 5 to 10 is a plan view showing an upper surface of a can according to various embodiments of the present disclosure. Figures 11 to 13 is a perspective view illustrating a lower surface of a head of a riveting terminal according to various embodiments of the present disclosure. Fig.14 is a perspective view showing a main body of a rivet terminal according to an embodiment of the present disclosure. Fig.15 is a partial cross-sectional view showing a terminal structure according to another embodiment of the present disclosure.

[0082] like Figures 5 to 10 As shown in , first anti-rotation portions 130a to 130f of various shapes may be respectively disposed in the upper surface portions 110a, 110b, 110c, 110d, 110e, 110f of the tank 100. The first anti-rotation portions 130a to 130f may be formed in the surrounding area of ​​the terminal hole 111. Since the riveted terminal 510 is inserted into the terminal hole 111, when the rotational force acts on the riveted terminal 510, the highest pressure is applied to the surrounding area of ​​the terminal hole 111. Therefore, when the anti-rotation structure is formed adjacent to the terminal hole 111, the rotation of the riveted terminal 510 may be effectively prevented. The first anti-rotation portions 130a to 130f may be formed by engraving patterns of various shapes such as dotted lines, straight lines, curves, and graphics (e.g., irregular shapes) using a laser or the like. The first anti-rotation portions 130 a to 130 f may appear as simple lines in a plan view, but when viewed laterally, the first anti-rotation portions 130 a to 130 f may be grooves extending to a predetermined depth.

[0083] like Figure 5 As shown in , the first anti-rotation portion 130a may have four straight lines arranged in a cross shape around the terminal hole 111. Figure 6 As shown in , the first anti-rotation portion 130b may have a plurality of straight lines radially arranged around the terminal hole 111. Figure 7 As shown in , the first anti-rotation portion 130c has a plurality of rectangles radially arranged around the terminal hole 111. Figure 8 As shown in , the first anti-rotation portion 130d may be arranged so that two or more square patterns are overlapped around the terminal hole 111 (eg, the two or more square patterns are rotationally offset from each other). Fig. 9 As shown in , the first anti-rotation portion 130e may have a shape in which a plurality of straight lines extend parallel or substantially parallel to each other and are surrounded by a circle (eg, a plurality of parallel straight lines are inside the circle). Fig.10 As shown in , the first anti-rotation portion 130f may have a shape in which a plurality of straight lines are combined into a grid inside a circle, etc. (e.g., a plurality of horizontal and vertical lines are arranged in a grid pattern and surrounded in a circle). However, the above shape is provided as an example, and various types of patterns other than the above pattern may be applied to the first anti-rotation portions 130a to 130f.

[0084] Due to the first anti-rotation parts 130a to 130f, the friction between the first insulator 520 and the upper surface parts 110a to 110f can be increased. Therefore, since the first insulator 520 does not rotate due to external force, the riveted terminal 510 does not rotate either. In addition, although not shown in the drawings, a protrusion corresponding to the shape of the first anti-rotation parts 130a to 130f can be formed on the first insulator 520. Therefore, the friction between the first insulator 520 and the upper surface parts 110a to 110f is significantly increased, so that the anti-rotation effect of the riveted terminal 510 can be greatly improved.

[0085] In addition, if Figures 11 to 14 As shown in FIG. 1 , second anti-rotation portions 516a to 516c of various shapes are provided on the riveted terminals 510a, 510b, 510c instead of the upper surface portion 110 of the can 100. For convenience, the main bodies of the riveted terminals 510a to 510c are shown as cylindrical configurations before deformation.

[0086] Figures 11 to 13 1 shows a configuration in which the lower surfaces (surfaces facing the upper surface portion) of the head portions 512a to 512c of the rivet terminals 510a to 510c face upward. Fig.11 As shown in , the second anti-rotation portion 516a may have a plurality of circular rings of different sizes protruding from the lower surface of the head 512a (e.g., the second anti-rotation portion 516a may include a plurality of concentric rings protruding from the lower surface of the head 512a). In one or more embodiments, the second anti-rotation portion 516a may be arranged so that the diameter of the circular ring becomes smaller toward one side of the body 514a. In addition, as shown in Fig.12 As shown in , the second anti-rotation portion 516b may be a plurality of grooves radially arranged on the lower surface of the head 512b around the body 514b. Fig.13 As shown in , the second anti-rotation portion 516c can be in the form of a plurality of ribs connected from the outside of the body 514c to the lower edge of the head 512c. Here, the second anti-rotation portion 516c can have an inclined shape in which the outer top end of the body 514c and the lower edge of the head 512c are connected (for example, the ribs of the second anti-rotation portion 516c can taper from the higher end at the body 514c to the lower end at the outer peripheral edge of the head 512b). In addition, in one or more embodiments, the second anti-rotation portion 516c can be in the form of a straight rib connected to the lower edge of the head 512c at the same height from the outside of the body 514c.

[0087] Due to the second anti-rotation parts 516a to 516c, the friction between the first insulator 520 and the heads 512a to 512c of the riveted terminals 510a to 510c can be increased. Thus, since the first insulator 520 does not rotate due to an external force, the riveted terminals 510a to 510c do not rotate either. In addition, in one or more embodiments, a protrusion or groove shaped to correspond to the second anti-rotation parts 516a to 516c can be formed on the first insulator 520. In such an embodiment, the friction between the first insulator 520 and the heads 512a to 512c of the riveted terminals 510a to 510c is significantly increased, so that the anti-rotation effect of the riveted terminals 510a to 510c can be greatly improved.

[0088] In addition, if Fig.14 As shown in , the third anti-rotation portion 518d can be arranged on the outer peripheral surface of the main body 514d of the riveted terminal 510d, rather than being arranged on the head 512d of the riveted terminal 510d. The third anti-rotation portion 518d can be a plurality of linear grooves concavely formed on the outer peripheral surface of the main body 514d. In one or more embodiments, in addition to the grooves, the third anti-rotation portion 518d can also be in the form of a protrusion or a rib. In addition, the third anti-rotation portion 518d can also be formed in various patterns. The third anti-rotation portion 518d can be formed by using laser engraving or a sawtooth method.

[0089] Due to the third anti-rotation portion 518d, the friction between the second insulator 530 and the main body 514 of the riveted terminal 510 can be increased. As a result, since the second insulator 530 does not rotate due to an external force, the riveted terminal 510 does not rotate either. In addition, in one or more embodiments, a protrusion or a groove shaped to correspond to the third anti-rotation portion 518d can be formed on the second insulator 530. In such an embodiment, the friction between the second insulator 530 and the main body 514 of the riveted terminal 510 is greatly increased, so that the anti-rotation effect of the riveted terminal 510 can be greatly improved.

[0090] The first to third anti-rotation parts described above may be provided individually or as a combination of two or more. In addition, a structure for preventing the insulator itself from rotating may also be included. The structure to be described later may also be provided together with the first to third anti-rotation parts, or may be provided individually. Fig.15As shown in, the terminal portion 500 may include a fourth anti-rotation portion 516e, 530a. The fourth anti-rotation portion 516e, 530a may be set as a protrusion and a groove. The riveted terminal 510e may include the above-mentioned protrusion 516e in contact with the upper surface of the second insulator 530' on the lower side. As an example, the protrusion 516e may protrude in a circular shape. In addition, in one or more embodiments, a plurality of protrusions having, for example, a linear shape, a hemispherical shape, an elliptical shape, or a streamlined shape may be arranged at regular intervals. The second insulator 530' may include a receiving groove 530a shaped to correspond to the above-mentioned protrusion 516e. The protrusion 516e and the receiving groove 530a may be engaged with each other to prevent the riveted terminal 510e from rotating along the plate surface direction of the upper surface portion 110 in the configuration in which the riveted terminal 510e is coupled to the upper surface portion 110 of the tank 100. In one or more embodiments, the protrusion 516e may be formed on the second insulator 530', and the receiving groove 530a may be formed on the rivet terminal 510e.

[0091] As described above, by including a structure for preventing the rotation of the riveted terminal on the upper surface portion of the can to which the riveted terminal is fastened, or on the riveted head portion or the riveted body, the riveted terminal does not rotate due to external force or vibration, thereby improving the stability and reliability of the secondary battery.

[0092] According to an embodiment of the present disclosure, since a structure for preventing the rotation of the riveted terminal is provided on the upper surface portion of the can to which the riveted terminal is fastened or the riveted head portion or the riveted body, the riveted terminal does not rotate due to external force or vibration. Therefore, the stability and reliability of the secondary battery can be improved.

[0093] Although the foregoing embodiment is merely one embodiment for carrying out the present disclosure, it is not limited to this embodiment, and those skilled in the art will appreciate that various changes in form and details may be made therein without departing from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A secondary battery, the secondary battery include: Electrode assembly; a tank accommodating the electrode assembly; a terminal portion including a riveted terminal coupled to one side of the can in the longitudinal direction and electrically connected to the electrode assembly and at least one insulator between the can and the riveted terminal to insulate the can and the riveted terminal from each other; and An anti-rotation portion is on at least one of the can and the terminal portion.

2. The secondary battery according to claim 1, in, The can includes a circular upper surface portion and a terminal hole in the circular upper surface portion, wherein the riveted terminal is in the terminal hole, and wherein the riveted terminal includes a head outside the upper surface portion and a body in the terminal hole and inside the can.

3. The secondary battery according to claim 2, in, The anti-rotation portion includes a first anti-rotation portion on the upper surface portion of the can.

4. The secondary battery according to claim 3, in, The first anti-rotation portion is formed by laser engraving.

5. The secondary battery according to claim 4, in, The first anti-rotation portion is a pattern selected from the group consisting of a dotted line, a straight line, a curved line, and a figure.

6. The secondary battery according to claim 5, in, The anti-rotation portion further includes a second anti-rotation portion on a surface of the head portion of the rivet terminal that faces the upper surface portion.

7. The secondary battery according to claim 6, in, The second anti-rotation portion is selected from the group consisting of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

8. The secondary battery according to claim 7, in, The anti-rotation portion further includes a third anti-rotation portion on an outer peripheral surface of the body of the rivet terminal.

9. The secondary battery according to claim 8, in, The third anti-rotation portion is selected from the group consisting of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

10. The secondary battery according to claim 9, in, The anti-rotation portion includes a combination of two or more of the first to third anti-rotation portions. 11 . The secondary battery according to claim 10 , further comprising at least one protrusion protruding on one of the insulator and the riveted terminal, and an accommodation groove for accommodating the protrusion on the other of the insulator and the riveted terminal. 12 . The secondary battery according to claim 1 , further comprising at least one protrusion protruding on one of the insulator and the riveted terminal and an accommodation groove for accommodating the protrusion on the other of the insulator and the riveted terminal.

13. A secondary battery, the secondary battery include: An electrode assembly, comprising a first electrode plate, a second electrode plate, and a separator between the first electrode plate and the second electrode plate; a can accommodating the electrode assembly, the can including a circular upper surface portion, a terminal hole in the circular upper surface portion, and a side portion extending downward from the upper surface portion; a terminal portion including a riveted terminal in the terminal hole and electrically connected to the first electrode plate and a plurality of insulators insulating the riveted terminal from the upper surface portion; as well as An anti-rotation portion is on at least one of the can and the terminal portion.

14. The secondary battery according to claim 13, in, The rivet terminal includes a head portion outside the upper surface portion and a body in the terminal hole and inside the can.

15. The secondary battery according to claim 14, in, The anti-rotation portion includes a first anti-rotation portion on the upper surface portion.

16. The secondary battery according to claim 15, in, The first anti-rotation portion is formed by laser engraving.

17. The secondary battery according to claim 16, in, The first anti-rotation portion is a pattern selected from the group consisting of a dotted line, a straight line, a curved line, and a figure.

18. The secondary battery according to claim 17, in, The anti-rotation portion further includes a second anti-rotation portion on a surface of the head portion of the rivet terminal that faces the upper surface portion.

19. The secondary battery according to claim 18, in, The second anti-rotation portion is selected from the group consisting of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

20. The secondary battery according to claim 19, in, The anti-rotation portion further includes a third anti-rotation portion on an outer peripheral surface of the body of the rivet terminal.

21. The secondary battery according to claim 20, in, The third anti-rotation portion is selected from the group consisting of a plurality of grooves, a plurality of protrusions, and a plurality of ribs.

22. The secondary battery according to claim 21, in, The anti-rotation portion includes a combination of two or more of the first to third anti-rotation portions. 23 . The secondary battery according to claim 21 , further comprising at least one protrusion protruding on one of the insulator and the riveted terminal and an accommodation groove for accommodating the protrusion on the other of the insulator and the riveted terminal. 24 . The secondary battery according to claim 13 , further comprising at least one protrusion protruding on one of the insulator and the riveted terminal, and an accommodation groove for accommodating the protrusion on the other of the insulator and the riveted terminal.

25. The secondary battery according to claim 22, further comprising: include: a first electrode current collector plate between the riveted terminal and the electrode assembly and electrically connected to the first electrode plate; as well as A second electrode current collector plate is adjacent to one end of the side portion and is electrically connected to the second electrode plate and the side portion. 26 . The secondary battery according to claim 25 , further comprising a cap assembly insulated from the can and coupled to the side portion.

27. The secondary battery according to claim 26, in, The side portion includes a beading portion concavely formed in an upper side of the cap assembly and a crimping portion formed by bending a lower end of the side portion inwardly, the cap assembly being between the beading portion and the crimping portion.

28. The secondary battery according to claim 27, in, The cover assembly includes a cover plate sealing the side portion and a gasket between the cover plate and the side portion.

29. The secondary battery according to claim 28, in, An edge of the second electrode current collector plate is between the beaded portion and the gasket and in contact with the beaded portion.

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