Tape attachment device, method for attaching tape, and secondary battery

Abstract

The present disclosure relates to a tape attachment device, a method for attaching a tape, and a secondary battery. The tape attachment device includes: a lower support structure configured to support a cylindrical electrode assembly; a plurality of compression jigs configured to bend an insulating tape attached to a side surface of the electrode assembly and protruding in a height direction of the electrode assembly along a circumference of an upper surface of the electrode assembly, and to attach the insulating tape to the upper surface of the electrode assembly; a pressing device configured to flatten an upper surface of the electrode assembly to which the insulating tape is attached; and a controller configured to control the compression clamp and the extrusion device.

Description

Technical Field

[0001] Embodiments of this disclosure relate to an attachment device (or means for attaching a strap), a method for attaching a strap, and a secondary battery. Background Technology

[0002] Unlike primary batteries, which are not designed to be (re)charged, secondary (or rechargeable) batteries are designed to be discharged and recharged. Low-capacity secondary batteries are used in portable small electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity secondary batteries are widely used as power sources to drive motors in hybrid and electric vehicles, as well as for storing electricity (e.g., household and / or utility-scale power storage). A secondary battery typically includes an electrode assembly containing positive and negative electrodes (e.g., composed of positive and negative electrodes), a housing of the electrode assembly, and electrode terminals connected to the electrode assembly.

[0003] For large-diameter cells, the secondary battery includes an insulating plate between the electrode assembly and the bottom surface of the casing.

[0004] The information disclosed in this background section is intended to enhance the understanding of the background art of this disclosure, and therefore may contain information that does not constitute related (or prior art). Summary of the Invention

[0005] An insulating plate is used to electrically insulate the positive and negative electrodes from each other. However, since there may be uninsulated portions on the outer part of the insulating plate, there is a possibility of an electrical short circuit between the positive electrode substrate and the housing used as the negative electrode. Therefore, a measure to prevent such an electrical short circuit may be needed.

[0006] Embodiments of this disclosure may relate to an apparatus, method, and system for attaching a secondary battery band while reducing or minimizing the possibility of an electrical short circuit.

[0007] These and other aspects and features of this disclosure will be described in, or will become apparent from, the following description of embodiments of this disclosure.

[0008] According to one or more embodiments of the present disclosure, an attachment device includes: a lower support structure configured to support a cylindrical electrode assembly; a plurality of compression clamps configured to bend an insulating strip attached to a side surface of the electrode assembly and projecting in the height direction of the electrode assembly along the circumference of an upper surface of the electrode assembly, and to attach the insulating strip to the upper surface of the electrode assembly; a pressing device configured to flatten the upper surface of the electrode assembly to which the insulating strip is attached; and a controller configured to control the compression clamps and the pressing device.

[0009] In one embodiment, the compression clamp may include a pair of first clamps facing each other and a pair of second clamps facing each other; the pair of first clamps may be located at the same height as each other; and the pair of second clamps may be located at the same height as each other.

[0010] In one embodiment, a pair of first clamps and a pair of second clamps may be located at the same height as each other.

[0011] In one embodiment, a pair of first clamps may be located at a different height than a pair of second clamps.

[0012] In an embodiment, the vertical spacing between a pair of first clamps and a pair of second clamps can be within 1 mm.

[0013] In one embodiment, the lower end portion of the upper surface of the compression clamp facing the electrode assembly may be tilted toward one end of the compression clamp.

[0014] In an embodiment, the end portion of the compression clamp may have an isosceles triangular shape, and the horizontal width of the compression clamp may be 95% to 105% of the length of one side of a regular octagon inscribed in the upper surface of the electrode assembly.

[0015] In an embodiment, the compression clamp can be configured to move between a rearward position and a forward position; the end portion of the compression clamp can contact an imaginary circle in the forward position; and the diameter of the imaginary circle can be smaller than the outer diameter of the electrode assembly.

[0016] In an embodiment, the compression clamp can be configured to move between a rearward position and a forward position; the end portion of the compression clamp can contact an imaginary circle in the rearward position; and the diameter of the imaginary circle can be larger than the outer diameter of the electrode assembly.

[0017] In an embodiment, the lower support structure may include a cushioning member, or the compression device may include a cushioning member.

[0018] In an embodiment, the insulating tape may include: a first region attached to a side surface of the electrode assembly; and a second region protruding in the height direction of the electrode assembly; and the controller may be configured to: move a compression clamp from a rearward position to a forward position to bend the second region of the insulating tape along the circumference of the upper surface of the electrode assembly; and lower the compression clamp to attach the bent second region of the insulating tape to the upper surface of the electrode assembly.

[0019] In one embodiment, the controller may be further configured to raise the compression clamp, rotate the compression clamp or lower support structure at an angle, and then lower the compression clamp.

[0020] According to one or more embodiments of the present disclosure, a method for attaching a tape includes: placing a cylindrical electrode assembly on a lower support structure; attaching a first region of an insulating tape to a side surface of the electrode assembly; bending a second region of the insulating tape protruding in the height direction of the electrode assembly along the circumference of an upper surface of the electrode assembly using a plurality of compression clamps, and attaching the second region of the insulating tape to the upper surface of the electrode assembly; and flattening the upper surface of the electrode assembly to which the second region of the insulating tape is attached using a pressing device.

[0021] In an embodiment, bending and attaching may include: moving a compression clamp from a rearward position to a forward position to bend a second region of the insulating tape along the circumference of the upper surface of the electrode assembly; and attaching the bent second region of the insulating tape to the upper surface of the electrode assembly by lowering the compression clamp.

[0022] In one embodiment, the end portion of the compression clamp may contact an imaginary circle in a rearward position; and the diameter of the imaginary circle may be larger than the outer diameter of the electrode assembly.

[0023] In an embodiment, the compression clamp may include a pair of first clamps facing each other and a pair of second clamps facing each other; the pair of first clamps may be located at the same height as each other; the pair of second clamps may be located at the same height as each other; the pair of first clamps may be located at a different height than the pair of second clamps; and the vertical distance between the pair of first clamps and the pair of second clamps may be within 1 mm.

[0024] In an embodiment, bending and attachment may further include: rotating the compression clamp or lower support structure at an angle after the compression clamp has risen; and lowering the compression clamp.

[0025] In an embodiment, the end portion of the compression clamp may have an isosceles triangular shape; and the horizontal width of the compression clamp may be 95% to 105% of the length of one side of a regular octagon inscribed in the upper surface of the electrode assembly.

[0026] In one embodiment, the compression clamp may include a pair of first clamps facing each other and a pair of second clamps facing each other; and the pair of first clamps and the pair of second clamps may be located at the same height.

[0027] According to one or more embodiments of this disclosure, a cylindrical battery manufacturing system includes: a first device configured to provide a cylindrical electrode assembly, the cylindrical electrode assembly including a first electrode, a second electrode, and a separator between the first and second electrodes; a second device configured to attach an insulating tape to the electrode assembly; and a third device configured to insert the electrode assembly with the insulating tape attached into a housing having an opening. The second device includes: a lower support structure configured to support the electrode assembly; a plurality of compression clamps configured to bend the insulating tape, which is attached to a side surface of the electrode assembly and protrudes in the height direction of the electrode assembly, along the circumference of an upper surface of the electrode assembly and attach the insulating tape to the upper surface of the electrode assembly; a pressing device configured to flatten the upper surface of the electrode assembly with the insulating tape attached; and a controller configured to control the first, second, and third devices.

[0028] According to one or more embodiments of the present disclosure, a secondary battery includes a cylindrical electrode assembly and an insulating strip attached to the electrode assembly via an attachment device, the attachment device including: a lower support structure configured to support the cylindrical electrode assembly; a plurality of compression clamps configured to bend the insulating strip, which is attached to a side surface of the electrode assembly and protrudes in the height direction, along the circumference of an upper surface of the electrode assembly and attach the insulating strip to the upper surface of the electrode assembly; a pressing device configured to flatten the upper surface of the electrode assembly to which the insulating strip is attached; and a controller configured to control the compression clamps and the pressing device.

[0029] In one embodiment, the insulating tape may include: a first region attached to a side surface of the electrode assembly; and a second region bent inward from the circumference of the upper surface of the electrode assembly and attached to the upper surface. The second region may include a plurality of pleats continuously positioned along the circumference of the upper surface of the electrode assembly, and the first region of the insulating tape may be without pleats.

[0030] In a comparative secondary battery, the outer portion of the insulating plate on the bottom surface inside the casing (e.g., a can) may have an uninsulated area of ​​approximately 1.5 mm on one side. This could cause the positive electrode substrate or positive electrode current collector to come into contact with the negative electrode portion of the casing (e.g., a can), resulting in a short circuit.

[0031] According to some embodiments of this disclosure, the risk of exposure of the substrate and current collector can be eliminated, minimized, or reduced by attaching an insulating tape to completely surround the edge portion of the electrode assembly (e.g., around the periphery of the edge portion of the electrode assembly).

[0032] According to some embodiments of this disclosure, since the first region of the insulating tape can be attached first, wrinkles on the side portions can be prevented or substantially prevented, improving the ease of inserting the electrode assembly into the secondary battery casing and preventing or substantially preventing the substrate from being squeezed on the outer portion of the electrode assembly. Furthermore, in comparative secondary batteries, the upper insulating tape attached to the upper surface of the insulating tape may pose a risk of substrate exposure due to cutting; therefore, it is important to attach the tape at the center of the upper surface of the electrode assembly. However, according to some embodiments, the side tape attachment method can relatively eliminate this importance of eccentricity.

[0033] However, the aspects and features of this disclosure are not limited to those described above, and other aspects and features not mentioned will be clearly understood by those skilled in the art from the detailed description described below. Attached Figure Description

[0034] The accompanying drawings illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure, further describe aspects and features of the present disclosure. Therefore, the present disclosure should not be construed as limited to the drawings.

[0035] Figure 1 A flowchart illustrating an example of an electrode assembly according to an embodiment of the present disclosure.

[0036] Figure 2 A block diagram illustrating a configuration with attachment devices according to an embodiment of the present disclosure.

[0037] Figure 3 A side view illustrating an embodiment of the present disclosure with an attachment device.

[0038] Figure 4 A top view illustrating the positional state of a compression clamp according to an embodiment of the present disclosure.

[0039] Figure 5 The vertical spacing between compression clamps according to an embodiment of the present disclosure is illustrated.

[0040] Figure 6 A projection view illustrating the end shape of a compression clamp according to an embodiment of the present disclosure.

[0041] Figure 7 A flowchart illustrating a method for attaching a tape using a compression clamp according to an embodiment of the present disclosure.

[0042] Figure 8 A view illustrating the end portion of a compression clamp according to an embodiment of the present disclosure.

[0043] Figure 9 A view illustrating the shape of a compression clamp according to an embodiment of the present disclosure.

[0044] Figure 10 Examples of compression clamps according to embodiments of the present disclosure are shown.

[0045] Figure 11 A flowchart illustrating a method for attaching a tape using a compression clamp according to an embodiment of the present disclosure.

[0046] Figure 12 A perspective view illustrating an example of an extrusion apparatus according to an embodiment of the present disclosure.

[0047] Figure 13 A flowchart illustrating a method for attaching a tape using a compression clamp according to an embodiment of the present disclosure.

[0048] Figure 14 A block diagram illustrating a system for manufacturing a cylindrical battery according to an embodiment of the present disclosure.

[0049] Figure 15 An example top view of an electrode assembly to which an insulating tape is attached via a tape attachment device according to an embodiment of the present disclosure is shown.

[0050] Description of some figure labels

[0051] 110: Electrode assembly

[0052] 110a: Electrode assembly with the first region of the insulating tape attached to its side surface.

[0053] 110b: An electrode assembly in which a first region of an insulating tape is attached to its side surface and a second region of an insulating tape is attached to its top surface.

[0054] 112: Side surface of the electrode assembly

[0055] 114: Upper surface of the electrode assembly

[0056] 120: Insulating tape

[0057] 120a: First zone of insulating tape

[0058] 120b: Second zone of the insulating tape Detailed Implementation

[0059] Some embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings, but should be interpreted as being consistent with the technical spirit of this disclosure, based on the principle that the inventor is capable of being his / her own lexicographer to appropriately define the terms and concepts in order to best interpret his / her invention.

[0060] The embodiments described in this specification and the configurations shown in the accompanying drawings are only some of the embodiments of this disclosure and do not represent all the technical ideas, aspects, and features of this disclosure. Therefore, it should be understood that various equivalents and modifications that can replace or modify the embodiments described herein may exist at the time of filing this application.

[0061] It will be understood that when a component or layer is described as being "on," "connected to," or "attached to" another component or layer, it can be directly on, connected to, or attached to the other component or layer, or one or more intermediate components or layers may be present. When a component or layer is described as being "directly" on, directly connected to, or directly attached to another component or layer, no intermediate components or layers are present. For example, when a first component is described as being "attached" or "connected" to a second component, the first component can be directly attached to or connected to the second component, or the first component can be indirectly attached to or connected to the second component via one or more intermediate components.

[0062] In the accompanying drawings, the dimensions of various elements, layers, etc., may be enlarged for clarity of illustration. The same reference numerals indicate the same elements. As used herein, the term “and / or” includes any and all combinations of one or more associated listed items. Furthermore, the use of “may” in describing embodiments of this disclosure refers to “one or more embodiments of this disclosure.” Expressions such as “at least one of…” and “any one of…” preceding / following the list of elements modify the entire list of elements, but not individual elements in the list. When phrases such as “at least one of A, B, and C,” “at least one of A, B, or C,” “at least one selected from the group of A, B, and C,” or “at least one selected from A, B, and C” are used to specify a list of elements A, B, and C, the phrase may refer to any and all suitable combinations or subsets of A, B, and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the term “use” may be considered synonymous with the term “utilize.” As used herein, the terms “roughly,” “approximately,” and similar terms are used as approximate terms rather than terms of degree, and are intended to account for the inherent variations in measurements or calculations that would be apparent to a person skilled in the art.

[0063] It will be understood that while the terms first, second, third, etc., may be used to describe various elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or segment from another element, component, region, layer, or segment. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment.

[0064] For ease of description, this document uses spatial relative terms such as “below,” “under,” “down,” “above,” and “above” to describe the relationship between one element or feature and another element or feature as shown in the figure. It will be understood that spatial relative terms are intended to encompass different orientations of the device in use or operation, in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “under” other elements or features can be oriented as “above” or “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device can be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptors used herein should be interpreted accordingly.

[0065] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to be limiting of this disclosure. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. It will be further understood that when used in this specification, the terms “comprising” and / or “including” specify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0066] Furthermore, any numerical ranges disclosed and / or enumerated herein are intended to include all subranges with the same numerical precision contained within the enumerated ranges. For example, the range “1.0 to 10.0” is intended to include all subranges between the enumerated minimum value of 1.0 and the enumerated maximum value of 10.0 (and inclusive of both), i.e., a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit enumerated herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit enumerated herein is intended to include all higher numerical limits contained therein. Therefore, the applicant reserves the right to amend this specification, including the claims, to expressly enumerate any subranges contained within the scope expressly enumerated herein.

[0067] Referring to two compared elements, features, etc., as “identical” may mean that they are “substantially identical.” Therefore, the phrase “substantially identical” can include cases with deviations considered low in the art, such as 5% or less. Furthermore, when a parameter is said to be consistent in a given region, this may mean that it is consistent in terms of its mean.

[0068] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0069] Placing any element "above (or below)" or "above (or below)" another element may mean that the arbitrary element can be positioned to contact the upper (or lower) surface of the element, and other elements may also be positioned between the element and any element positioned on (or below) the element.

[0070] Furthermore, it will be understood that when a component is referred to as “connected,” “linked,” or “attached” to another component, the components can be directly “connected,” “linked,” or “attached” to each other, or another component can be “between” the components.

[0071] Throughout this specification, unless otherwise stated, when “A and / or B” is used, it means A, B, or A and B. In other words, “and / or” includes any or all combinations of the listed items. Unless otherwise indicated, when “C to D” is used, it means greater than or equal to C and less than or equal to D.

[0072] In this disclosure, for clarity of description, the dimensions and relative dimensions of the areas shown in the accompanying drawings may be enlarged. In other words, the dimensions shown in the drawings are for ease of understanding and are not limiting. Throughout the specification, the same reference numerals indicate the same constituent elements.

[0073] Figure 1 A flowchart illustrating an example of an electrode assembly 110b attached according to an embodiment of the present disclosure.

[0074] refer to Figure 1 The secondary battery according to an embodiment may include an electrode assembly 110, a housing containing the electrode assembly 110 and an electrolyte, a cover assembly coupled to an opening in the housing to seal the housing, and an insulating plate disposed inside the housing between the electrode assembly 110 and the cover assembly. The electrode assembly 110 may include a first electrode and a second electrode, with a separator between the first electrode and the second electrode. An insulating strip 120 may be attached around the upper portion of the side surface 112 and the outermost portion of the upper surface 114 of the electrode assembly 110 (e.g., around the periphery of the upper portion of the side surface 112 and the outermost portion of the upper surface 114 of the electrode assembly 110).

[0075] The first electrode includes a first substrate and a first active material layer on the first substrate. A first lead tab extends outward from a first uncoated portion of the first substrate where the first active material layer is not disposed, and the first lead tab can be electrically connected to a cover assembly. The second electrode includes a second substrate and a second active material layer on the second substrate. A second lead tab extends outward from a second uncoated portion of the second substrate where the second active material layer is not disposed, and the second lead tab can be electrically connected to a housing. The first lead tab and the second lead tab can extend in opposite directions. The first electrode can be used as a positive electrode. In this embodiment, the first substrate can be made of, for example, aluminum foil, and the first active material layer can include, for example, a transition metal oxide. The second electrode can be used as a negative electrode. In this embodiment, the second substrate can be made of, for example, copper foil or nickel foil, and the second active material layer can include, for example, graphite.

[0076] The separator prevents short circuits between the first and second electrodes while allowing lithium ions to move between them. The separator can be made of, for example, polyethylene membrane, polypropylene membrane, or polyethylene-polypropylene membrane.

[0077] The electrode assembly 110 can be formed as follows: Figure 1 The cylindrical shape is illustrated. The upper surface 114 of the electrode assembly 110 may refer to the surface in contact with the insulating plate. In some embodiments, the side surface 112 of the electrode assembly 110 may be a surface connected to the upper surface 114 and the lower surface opposite to the upper surface 114 of the electrode assembly 110. The upper surface 114 and the lower surface of the electrode assembly 110 may have a circular shape.

[0078] The insulating tape 120 may include a first region 120a attached to a side surface 112 of the electrode assembly 110 and a second region 120b protruding in the height direction of the electrode assembly 110. After the first region 120a of the insulating tape 120 is attached to the side surface 112 of the electrode assembly 110, the second region 120b may be attached to the upper surface 114 of the electrode assembly 110. More specifically, the first region 120a of the insulating tape 120 may be attached to the side surface 112 of the electrode assembly 110 by means of means (e.g., attachment means on the side of the insulating tape 120), thereby forming an electrode assembly 110a with the first region 120a of the insulating tape 120 attached to its side surface 112. Subsequently, the second region 120b protruding in the height direction of the insulating tape 120 may be bent along the periphery (or circumference) of the upper surface 114 of the electrode assembly 110a. Subsequently, the second region 120b of the bent insulating tape 120 is attached to the upper surface 114 of the electrode assembly 110a, thereby forming an electrode assembly 110b in which the first region 120a of the insulating tape 120 is attached to its side surface 112 and the second region 120a is attached to its upper surface 114.

[0079] According to an embodiment, the first region 120a and the second region 120b of the insulating tape 120 may have the same or substantially the same area, and the boundary line between the first region 120a and the second region 120a may be formed to make circumferential contact with the upper surface 114 of the electrode assembly 110. For example, the width of the insulating tape 120 in the height direction may be 15 mm, and the height of the protruding portion of the insulating tape 120 (e.g., corresponding to the second region 120b) may be 7.5 mm. For example, the length of the insulating tape 120 may be formed to a suitable length (e.g., a predetermined length) than the circumference of the upper surface 114 of the electrode assembly 110, such as 10 mm.

[0080] The housing houses the electrode assembly 110 and, together with the cover assembly, forms the appearance of a secondary battery. The housing may have a generally cylindrical body portion and a bottom portion connected to one side (e.g., one end) of the body portion. An inwardly deformed crimped portion (e.g., a crimped member) may be formed in the body portion, and an inwardly bent crimped portion (e.g., a crimping member) may be formed at the open end of the body portion.

[0081] The rolled edge reduces or prevents movement of the electrode assembly 110 within the housing and facilitates the placement of the gasket and cover assembly. The crimping portion securely holds the cover assembly in place by pressing the edge of the housing against the gasket. For example, the housing may be formed of nickel-plated iron.

[0082] The cover assembly can be secured to the inside of the crimping portion via a gasket to seal the housing. The cover assembly may include, but is not limited to, an upper cover, a safety vent, a lower cover, an insulating component, and a sub-plate, and can be modified in various ways.

[0083] An insulating plate may be arranged below the rolled edge to contact the electrode assembly 110. The insulating plate may have a tab opening through which a first lead tab is led out. A cover assembly electrically connected to the first electrode via the first lead tab may face the electrode assembly 110, with the insulating plate positioned between the cover assembly and the electrode assembly 110, and the cover assembly may be kept insulated (e.g., electrically insulated) from the electrode assembly 110 by the insulating plate.

[0084] The outer portion of the insulating plate on the inner side of the bottom portion (e.g., on the bottom surface of the housing) may have an uninsulated area of ​​approximately 1.5 mm on one side. This could cause the positive electrode substrate or positive electrode current collector to come into contact with the negative electrode portion of the housing (e.g., a can), resulting in a short circuit. According to some embodiments of this disclosure, by including the insulating strip 120 as described above, the risk of exposure of the substrate and current collector can be eliminated or reduced by the insulating strip 20 completely surrounding the edge portion of the electrode assembly 110 (e.g., around the periphery of the edge portion of the electrode assembly 110).

[0085] Since the first region 120a of the insulating tape 120 can be attached first to the side surface 112 of the electrode assembly 110, wrinkles in the insulating tape 120 on the side surface 112 can be prevented or substantially prevented. In some embodiments, this can improve the ease of insertion of the electrode assembly 110 into the secondary battery housing and prevent or substantially prevent the substrate from being squeezed on the outside of the electrode assembly 110. In the case where the insulating tape 120 is first attached to the upper surface 114 of the electrode assembly 110 and then to the side surface 112, it may be important to attach the insulating tape 120 to the center of the upper surface 114 of the electrode assembly 110, but the side tape attachment method described above can relatively eliminate this importance of eccentricity.

[0086] Figure 2 A block diagram illustrating the configuration of the attachment device 200 according to an embodiment of the present disclosure.

[0087] refer to Figure 2 The attachment device 200 may include a lower support structure 210, a plurality of compression clamps 220, a compression device 230 and a controller 240.

[0088] The lower support structure 210 can support a cylindrical electrode assembly. For example, the lower support structure 210 can contact the lower surface of the electrode assembly opposite to the upper surface. According to an embodiment, the lower support structure 210 can be formed to contact a portion of the side surface of the electrode assembly and the lower surface of the electrode assembly.

[0089] The compression clamp 220 can be attached to the side surface of the electrode assembly to bend the insulating strip protruding in the height direction along the circumference of the upper surface of the electrode assembly, and can attach the insulating strip to the upper surface of the electrode assembly. The compression clamp 220 can be moved by the controller 240 and can contact a second region of the insulating strip protruding from the side surface of the electrode assembly during movement. The end portion of the compression clamp 220 can have various suitable shapes, such as circular, triangular and / or curved, but this disclosure is not limited thereto. Reference will be made below. Figures 3 to 11 The shape and operation of the compression clamp 220 are described in more detail.

[0090] The extrusion device 230 can be configured to flatten or substantially flatten the upper surface of the electrode assembly to which the insulating tape is attached. For example, the extrusion device 230 may include a flat or substantially flat surface that extrudes the upper surface of the electrode assembly. In this case, the flat surface of the extrusion device 230 may be wider than the upper surface of the electrode assembly. Reference will be made below. Figure 12 and Figure 13 The extrusion device 230 is described in more detail.

[0091] Controller 240 can control the compression clamp 220 and the pressing device 230. For example, controller 240 can move the compression clamp 220 back and forth to bend a second region of the insulating tape along the circumference of the upper surface of the electrode assembly. In some embodiments, controller 240 can lower the compression clamp 220 to attach the second region of the bent tape to the upper surface of the electrode assembly. Furthermore, controller 240 can raise the compression clamp 220, then rotate the compression clamp 220 or the lower support structure 210 at a desired angle (e.g., a predetermined angle), and then lower the compression clamp 220 again. In some embodiments, controller 240 can lower the pressing device 230 toward the center of the upper surface of the electrode assembly to apply pressure to the second region of the insulating tape attached to the upper surface of the electrode assembly. Controller 240 may include integrated circuits, processors, and memory, etc.

[0092] Figure 3 A side view illustrating an embodiment of the present disclosure with an attachment device. Reference Figure 3 An electrode assembly 110 having an insulating strip attached to its side surface can be disposed between the compression clamp and the lower support structure 210.

[0093] The compression clamp may include a pair of compression clamps 320a and 320b, and the pair of compression clamps 320a and 320b may be configured to face each other relative to the upper surface of the electrode assembly 110. The pair of compression clamps 320a and 320b may be connected to a controller and may move forward / backward. The compression clamp may include multiple pairs of compression clamps 320a and 320b. For example, the compression clamp may include a first compression clamp and a second compression clamp.

[0094] In an embodiment, the lower support structure 210 may be formed around the lower end portion of the side surface of the electrode assembly 110 (e.g., around the periphery of the lower end portion of the side surface of the electrode assembly 110) to fix the electrode assembly 110. The central axis of the electrode assembly 110 may coincide with the central axis of the lower support structure 210.

[0095] The lower support structure 210 may include a buffer member 310. The buffer member 310 may be formed at the lower end of the lower support structure 210, but this disclosure is not limited thereto. For example, the buffer member 310 may be formed at the upper end of the lower support structure 210, the upper end of the compression clamp, and / or the upper end of the extrusion device. For example, the buffer member 310 may include a cylinder head.

[0096] Therefore, a desired pressure (e.g., a specific or predetermined pressure) can be maintained in the electrode assembly 110 while the squeezing device and compression clamp descend to squeeze the second region of the insulating tape attached to the upper surface of the electrode assembly 110, thereby preventing or substantially preventing damage to the electrode assembly 110. For example, the buffer member 310 may include a spring as a buffer device.

[0097] Figure 4 A top view illustrating the positional state of a compression clamp according to an embodiment of the present disclosure. Figure 5 The vertical spacing d1 between compression clamps according to an embodiment of the present disclosure is illustrated. Figure 6 A projection view illustrating the end shape of a compression clamp according to an embodiment of the present disclosure.

[0098] Figure 4 , Figure 5 and Figure 6 The multiple compression clamps illustrated above are from the references. Figure 2 An example of a compression clamp described. (Reference) Figure 4 The compression clamp can be moved between a forward position 420 and a rearward position 410 using a controller.

[0099] The compression clamp may include a pair of first clamps 430a and 430b facing each other and a pair of second clamps 440a and 440b facing each other. The movement directions of the pair of first clamps 430a and 430b may be opposite to each other, and the movement directions of the pair of second clamps 440a and 440b may also be opposite to each other. For example, the movement directions of the left first clamp 430a and the right first clamp 430b may be opposite to each other.

[0100] The forward position 420 can correspond to the position where the compression clamp moves and stops in the direction of the central axis of the upper surface of the electrode assembly 110. For example, the movement directions of a pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b can be perpendicular or substantially perpendicular to each other.

[0101] The rearward position 410 can be the position where each compression clamp moves and stops in the direction opposite to the forward direction. According to an embodiment, the compression clamp can move from the rearward position 410 to the forward position 420 to bend the second region of the insulating tape. Thereafter, the compression clamp can be lowered from the forward position 420 to attach the second region of the insulating tape to the upper surface of the electrode assembly 110.

[0102] In an embodiment, a pair of first clamps 430a and 430b may be positioned at the same or substantially the same height as each other, and a pair of second clamps 440a and 440b may be positioned at the same or substantially the same height as each other. As an example, the pair of first clamps 430a and 430b may be spaced apart from each other by an appropriate distance (e.g., a predetermined distance) in a forward position 420, and the pair of second clamps 440a and 440b may also be spaced apart from each other by an appropriate distance (e.g., a predetermined distance) in a forward position 420. As another example, the pair of first clamps 430a and 430b may be in contact with each other in a forward position 420, and the pair of second clamps 440a and 440b may be spaced apart from each other by an appropriate distance (e.g., a predetermined distance) from a forward position 420.

[0103] In some embodiments, a pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b may be positioned at different heights from each other. In some embodiments, a pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b may be positioned at the same or substantially the same height from each other.

[0104] refer to Figure 5 A pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b may be vertically spaced apart by a distance (e.g., a predetermined distance) d1. The vertical direction may be perpendicular to or substantially perpendicular to the ground, and the horizontal direction may be parallel to or substantially parallel to the ground. Figure 4 As illustrated, a pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b may not overlap vertically at a rearward position 410. In some embodiments, a pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b may at least partially overlap vertically at a forward position 420. The spacing distance d1 can be defined as the distance between the vertically overlapping clamps at the forward position 420. For example, it can be defined as the distance between the upper surface of the vertically overlapping first clamp 430b and the lower surface of the vertically overlapping second clamp 440b. For example, a pair of first clamps 430a and 430b and a pair of second clamps 440a and 440b may be spaced less than 1 mm apart from each other.

[0105] refer to Figure 6 The end portions of a pair of first clamps 430a and 430b and the end portions of a pair of second clamps 440a and 440b may have curved shapes. According to an embodiment, the end portions of the compression clamps contact an imaginary circle 600 at a rearward position 410, and the diameter of the imaginary circle 600 may be greater than the outer diameter of the upper surface of the electrode assembly.

[0106] Figure 7A flowchart illustrating a method for attaching a tape using compression clamps (e.g., tape attachment method 700) according to an embodiment of the present disclosure. Tape attachment method 700 using compression clamps may include moving a plurality of compression clamps from a rearward position to a forward position to cause a second region of the insulating tape to bend circumferentially along the upper surface of the electrode assembly (S710).

[0107] The compression clamp may include a pair of first clamps facing each other and a pair of second clamps facing each other. The pair of first clamps may be positioned at the same or substantially the same height as each other, and the pair of second clamps may be positioned at the same or substantially the same height as each other. In some embodiments, the pair of first clamps and the pair of second clamps may be positioned at different heights. For example, the vertical spacing between the pair of first clamps and the pair of second clamps may be within 1 mm.

[0108] In some embodiments, the end portions of the compression clamp may all be in contact with the imaginary circle in a rearward position, and the diameter of the imaginary circle may be larger than the outer diameter of the electrode assembly.

[0109] Then, the compression clamp can be lowered to attach the second region of the bent insulating strip to the upper surface of the electrode assembly (S720).

[0110] Figure 8 A view illustrating the end portion of a compression clamp according to an embodiment of the present disclosure. Figure 9 A view illustrating the shape of a compression clamp according to an embodiment of the present disclosure. Figure 8 and Figure 9 The multiple compression clamps 800 shown in the example are for reference above. Figure 2 An example of a compression clamp described.

[0111] refer to Figure 8 A pair of first clamps 810a and 810b and a pair of second clamps 820a and 820b may have a lower surface 810b_bs facing the upper surface 114 of the electrode assembly. The lower surface 810b_bs of each compression clamp may have one end pointing towards the central axis of the electrode assembly and the other end opposite to that end.

[0112] The compression clamp may have an end portion 810b_ep including one end. The end portion of the compression clamp 800 may have an isosceles triangular shape and may be formed such that the width of the compression clamp in the horizontal direction decreases toward one end of the compression clamp.

[0113] The end portions of the lower surfaces 810b_bs of the upper surface 114 facing the electrode assembly of the compression clamp 800 can be formed to be inclined toward one end of the compression clamp 800. For example, the end portions of the lower surfaces of a pair of first clamps 810a and 810b can be formed to be inclined toward one end of the respective first clamp. Therefore, the portion of the second region in the compression clamp that first contacts the insulating tape can be inclined, making it easier for the insulating tape to bend along the compression clamp.

[0114] According to an embodiment, an inclined surface may be included on the lower surface of the first clamp, and the inclined surface may be in the shape of a pentagon with two right angles. The starting point of the inclined surface may be between the point where the width in the horizontal direction begins to decrease and the other end of the first clamp, and the ending point of the inclined surface may be one end of the first clamp. The boundary between the lower surface 810b_bs of the first clamp and the inclined surface may be formed parallel to or substantially parallel to the horizontal direction of the first clamp.

[0115] According to an embodiment, a pair of first clamps 810a and 810b and a pair of second clamps 820a and 820b can be respectively disposed at the same or substantially the same height. Thus, the end portions of each of the pair of first clamps 810a and 810b and the end portions of each of the pair of second clamps 820a and 820b can contact each other in a forward-facing state.

[0116] refer to Figure 9 The end portion of the first clamp 810b may have an isosceles triangular shape, and the horizontal width h2 of the first clamp 810b may be 95% to 105% of the length h1 of one side of the regular octagon inscribed in the upper surface 114 of the electrode assembly. For example, when the outer diameter of the upper surface 114 of the electrode assembly is about 44.6 mm, the length h1 of one side of the inscribed octagon may be 17.07 mm, and the horizontal width h2 of the first clamp 810b may be 17.5 mm.

[0117] Figure 10 Examples of compression clamps according to embodiments of the present disclosure are shown. Figure 10 The multiple compression clamps 1000 shown in the example are for reference above. Figure 2 An example of a compression clamp described.

[0118] refer to Figure 10The end portions of the compression clamps 1000 are all in contact with an imaginary circle in the forward position, and the diameter of the imaginary circle can be smaller than the outer diameter of the electrode assembly. For example, a pair of first clamps 1010a and 1010b and a pair of second clamps 1020a and 1020b can contact adjacent clamps on opposite sides in the forward position to form an imaginary shape (e.g., circle, ellipse, polygon, convex polygon, etc.) smaller than the outer diameter of the upper surface of the electrode assembly. According to an embodiment, the pair of first clamps 1010a and 1010b and the pair of second clamps 1020a and 1020b can be respectively positioned at the same or substantially the same height.

[0119] The end portion of the lower surface of the compression clamp 1000 facing the upper surface of the electrode assembly can be formed to be inclined toward one end of the compression clamp 1000. For example, the end portion 1010b_ep of the lower surface of the first clamp 1010b can be inclined toward one end of the first clamp 1010b.

[0120] According to an embodiment, one end of the compression clamp 1000 may be formed into a curved shape. In some embodiments, the boundary between the lower surface of the compression clamp 1000 and the inclined surface may be formed into a curved shape. In this case, the end portion of the lower surface of the compression clamp 1000 may have a part of a fan-shaped shape.

[0121] Figure 11 A flowchart illustrating a method for attaching a tape using compression clamps (e.g., tape attachment method 1100) according to an embodiment of the present disclosure. Tape attachment method 1100 using compression clamps may include moving a plurality of compression clamps from a rearward position to a forward position to cause a second region of the insulating tape to bend circumferentially along the upper surface of the electrode assembly (S1110).

[0122] The end portions of the compression clamp may have an isosceles triangular shape, and the horizontal width of the compression clamp may be 95% to 105% of the length of one side of a regular octagon inscribed in the upper surface of the electrode assembly. As another example, the end portions of the compression clamp may all contact an imaginary circle in a forward position, and the diameter of the imaginary circle may be smaller than the outer diameter of the electrode assembly. In some embodiments, the compression clamp may include a pair of first clamps facing each other and a pair of second clamps facing each other, and the pair of first clamps and the pair of second clamps may be positioned at the same or substantially the same height.

[0123] Then, the compression clamp can be lowered to attach the second region of the bent insulating strip to the upper surface of the electrode assembly (S1120).

[0124] Then, after the compression clamps are raised, the compression clamps or lower support structure can be rotated at an angle (e.g., a predetermined angle) (S1130). For example, multiple compression clamps (where the compression clamps include four clamps) or lower support structures can be rotated 45 degrees. Therefore, the attachment device may include a drive portion for rotating the compression clamps or lower support structure.

[0125] Subsequently, the compression clamp can be lowered again to perform a secondary compression (S1140). By performing a primary compression using the compression clamp and a secondary compression after the rotation of the compression clamp, wrinkles in the insulating tape (e.g., the second region of the insulating tape) attached to the upper surface of the electrode assembly can be effectively controlled.

[0126] Figure 12 A perspective view illustrating an example of an extrusion apparatus according to an embodiment of the present disclosure.

[0127] refer to Figure 12 The attachment device may include a pressing device 1210.

[0128] The extrusion device 1210 can flatten the upper surface 114 of the electrode assembly 110 to which the insulating tape is attached. As an example, the lower portion of the extrusion device 1210 may include a plate-like member disposed thereon. The extrusion device 1210 can extrude the electrode assembly 110 to which the insulating tape 120 is attached in a vertically downward direction.

[0129] In the lowered state, the lower surface of the extrusion device 1210 can contact the upper surface of the electrode assembly 110 to which the insulating tape 120 is attached. The lower surface of the extrusion device 1210 can have a circular shape.

[0130] The central axis of the lower surface of the extrusion device 1210 may coincide with the central axis of the upper surface 114 of the electrode assembly 110, and the upper surface 114 of the electrode assembly 110 and the lower surface of the extrusion device 1210 may be parallel to each other. The area of ​​the lower surface of the extrusion device 1210 may be larger than the area of ​​the upper surface 114 of the electrode assembly 110.

[0131] To prevent or substantially prevent damage to the electrode assembly 110, the upper end of the extrusion device 1210 or the lower end of the lower support structure 210 may include a buffer member, thereby allowing a constant or substantially constant pressure to be applied. For example, a spring may be included at the lower end of the lower support structure and / or a cylinder head may be included at the upper end of the extrusion device 1210.

[0132] Figure 13 A flowchart illustrating a method for attaching a tape (e.g., tape attachment method 1300) according to an embodiment of the present disclosure is shown.

[0133] The attachment method 1300 may include placing a cylindrical electrode assembly on the lower support structure (S1310).

[0134] Then, the first region of the insulating tape can be attached to the side surface of the electrode assembly (S1320).

[0135] Next, the compression clamp can bend the second region of the insulating tape protruding in the height direction of the electrode assembly along the circumference of the upper surface of the electrode assembly and attach the second region to the upper surface of the electrode assembly (S1330). For example, the compression clamp can move from a rearward position to a forward position, bend the second region of the insulating tape along the circumference of the upper surface of the electrode assembly, and can be lowered to attach the bent second region of the insulating tape to the upper surface of the electrode assembly. Additionally / optionally, after the compression clamp rises, the compression clamp or the lower support structure can be rotated at an angle (e.g., a predetermined angle), and the compression clamp can be lowered again to perform a secondary compression.

[0136] Subsequently, the extrusion device can flatten the upper surface of the electrode assembly to which the insulating tape (e.g., the second region of the insulating tape) is attached (S1340).

[0137] Figure 14 A block diagram illustrating a system 1400 for manufacturing cylindrical batteries (e.g., a cylindrical battery manufacturing system 1400) according to an embodiment of the present disclosure.

[0138] refer to Figure 14 The cylindrical battery manufacturing system 1400 may include a first device 1410, a second device 1420, and a third device 1430. The second device 1420 may be one of the attachment devices described above.

[0139] The first device 1410 can provide a cylindrical electrode assembly including a first electrode, a second electrode, and a diaphragm disposed between the first electrode and the second electrode.

[0140] The second device 1420 can attach an insulating tape to an electrode assembly. The second device 1420 may include a lower support structure for supporting the electrode assembly. The second device 1420 may include a plurality of compression clamps that bend an insulating tape, which can be attached to a side surface of the electrode assembly to project in the height direction, along the circumference of the upper surface of the electrode assembly, and can attach the insulating tape to the upper surface of the electrode assembly. In some embodiments, the second device 1420 may include a pressing device for flattening the upper surface of the electrode assembly to which the insulating tape is attached. In an embodiment, the second device 1420 may include a controller for controlling the first device 1410, the second device 1420, and the third device 1430. As another example, the cylindrical battery manufacturing system 1400 may include a controller for controlling the first device 1410, the second device 1420, and the third device 1430. The controller may include integrated circuits, processors, and memory, etc.

[0141] The third device 1430 can insert the electrode assembly attached to the insulating tape into the housing with an opening. In some embodiments, the cylindrical battery manufacturing system 1400 may further include an electrolyte injection device for injecting electrolyte into the housing and a sealing device for sealing the housing into which the electrolyte is injected.

[0142] Figure 15 An example top view of an electrode assembly 1500 to which an insulating tape 1510 is attached via a tape attachment device according to an embodiment of the present disclosure.

[0143] refer to Figure 15 The secondary battery may include insulating tape 1510 as per the above reference. Figures 2 to 14 The electrode assembly 1500 is attached to at least one of the described attachment devices, attachment methods, or cylindrical battery manufacturing systems.

[0144] In an embodiment, the electrode assembly 1500 may have a cylindrical structure including a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. An insulating strip 1510 may be attached to the outer peripheral surface of the electrode assembly 1500. The insulating strip 1510 may include a first region 1512 attached to a side surface of the electrode assembly 1500 and a second region 1514 bent inward from the outer periphery of the upper surface of the electrode assembly 1500 to attach to the upper surface of the electrode assembly 1500. For example, a secondary battery may include the first region 1512 of the insulating strip 1510 (e.g., Figure 1 The first region 120a) is attached to the side surface and the second region 1514 (e.g., Figure 1 The second region 120b) is attached to the electrode assembly 1500 on the upper surface (e.g., as referenced above). Figure 1 The electrode assembly 110b described.

[0145] In an embodiment, no wrinkles are formed in the insulating tape 1510 attached to the side surface of the cylindrical electrode assembly 1500. For example, a first region 1512 of the insulating tape 1510 attached to the side surface of the cylindrical electrode assembly 1500 may be wrinkle-free and may adhere tightly to the side surface of the electrode assembly 1500 along its entire or substantially entire region.

[0146] In an embodiment, the second region 1514 may include a plurality of folds 1516 continuously formed along the outer periphery (or circumference) of the upper surface of the electrode assembly 1500. For example, the plurality of folds 1516 can be defined by the above reference. Figures 2 to 14 The described multiple compression clamps are formed at regular or irregular intervals.

[0147] In embodiments, the pleats 1516 may have the same or similar shapes to each other. For example, the pleats 1516 may be in the form of isosceles triangular protrusions. However, this disclosure is not limited thereto, and the pleats 1516 may optionally be formed into various other suitable shapes such as rhombuses, semicircles, curved triangles, trapezoids, or parabolic shapes with a radius of curvature.

[0148] In this embodiment, the variation in the spacing d2 between adjacent pleats 1516 can be kept within 20%. For example, the deviation of the spacing d2 between adjacent pleats 1516 can be in the range of 1%–15%, 3%–12%, 5%–10%, 1%–10%, 1%–7%, or 3%–5%. The deviation of the spacing d2 range can be adjusted based on the shape and control parameters of the compression fixture, which helps to improve the consistency of the tape attachment quality and process accuracy.

[0149] Therefore, multiple wrinkles 1516 can be formed on the upper surface of the electrode assembly 1500, while no wrinkles are formed on the side surfaces of the electrode assembly 1500, thereby improving the insertability of the electrode assembly 1500 into a housing (e.g., a can). Furthermore, this can prevent or substantially prevent deformation or compression of the outer substrate of the electrode assembly 1500.

[0150] While this disclosure has been described above with reference to embodiments thereof, it is not limited thereto. Those skilled in the art can make various modifications and variations thereto within the spirit and equivalent scope of the claims.

Claims

1. A device with an attachment, comprising: The lower support structure is configured to support the cylindrical electrode assembly; Multiple compression clamps are configured to bend an insulating strip attached to the side surface of the electrode assembly and protruding in the height direction of the electrode assembly along the circumference of the upper surface of the electrode assembly, and to attach the insulating strip to the upper surface of the electrode assembly. A pressing device is configured to flatten the upper surface of the electrode assembly to which the insulating tape is attached; and A controller is configured to control the compression clamp and the extrusion device.

2. The attachment device according to claim 1, wherein: The compression clamp includes a pair of first clamps facing each other and a pair of second clamps facing each other; The pair of first clamps are located at the same height as each other; and The pair of second clamps are located at the same height as each other.

3. The attachment device according to claim 2, wherein the pair of first clamps and the pair of second clamps are located at the same height as each other.

4. The attachment device according to claim 2, wherein the pair of first clamps are located at a different height from the pair of second clamps.

5. The attachment device according to claim 4, wherein the vertical spacing between the pair of first clamps and the pair of second clamps is within 1 mm.

6. The attachment device according to claim 1, wherein the end portion of the lower surface of the upper surface of the compression clamp facing the electrode assembly is inclined toward one end of the compression clamp.

7. The attachment device according to claim 1, wherein the end portion of the compression clamp has an isosceles triangular shape, and The horizontal width of the compression clamp is 95% to 105% of the length of one side of the regular octagon inscribed in the upper surface of the electrode assembly.

8. The attachment device according to claim 1, wherein: The compression clamp is configured to move between a rearward position and a forward position; The end portion of the compression clamp contacts an imaginary circle at the forward position; and The diameter of the imaginary circle is smaller than the outer diameter of the electrode assembly.

9. The attachment device according to claim 1, wherein: The compression clamp is configured to move between a rearward position and a forward position; The end portion of the compression clamp contacts an imaginary circle at the rearward position; and The diameter of the imaginary circle is larger than the outer diameter of the electrode assembly.

10. The attachment device according to claim 1, wherein the lower support structure includes a cushioning member, or the compression device includes a cushioning member.

11. The attachment device according to claim 1, wherein: The insulating tape includes: A first region, attached to the side surface of the electrode assembly; and The second region protrudes in the height direction of the electrode assembly; and The controller is configured to: The compression clamp is moved from a rearward position to a forward position, causing the second region of the insulating tape to bend along the circumference of the upper surface of the electrode assembly; and The compression clamp is lowered to attach the second region of the bent insulating strip to the upper surface of the electrode assembly.

12. The attachment device of claim 11, wherein the controller is further configured to raise the compression clamp, rotate the compression clamp or the lower support structure at an angle, and then lower the compression clamp.

13. A method for attaching a tape, comprising: The cylindrical electrode assembly is mounted on the lower support structure; The first region of the insulating tape is attached to the side surface of the electrode assembly; The second region of the insulating tape protruding in the height direction of the electrode assembly is bent along the circumference of the upper surface of the electrode assembly by multiple compression clamps, and the second region of the insulating tape is attached to the upper surface of the electrode assembly. as well as The upper surface of the electrode assembly to which the second region of the insulating tape is attached is flattened by a pressing device.

14. The method for attaching a tape according to claim 13, wherein the bending and the attachment comprise: The compression clamp is moved from a rearward position to a forward position so that the second region of the insulating tape bends along the circumference of the upper surface of the electrode assembly; as well as The second region of the bent insulating strip is attached to the upper surface of the electrode assembly by lowering the compression clamp.

15. The method for attaching a tape according to claim 14, wherein: The end portion of the compression clamp contacts an imaginary circle at the rearward position; and The diameter of the imaginary circle is larger than the outer diameter of the electrode assembly.

16. The method for attaching a tape according to claim 15, wherein: The compression clamp includes a pair of first clamps facing each other and a pair of second clamps facing each other; The pair of first clamps are located at the same height as each other; The pair of second clamps are located at the same height as each other; The pair of first clamps are located at a different height than the pair of second clamps; and The vertical distance between the pair of first clamps and the pair of second clamps is within 1 mm.

17. The method for attaching a tape according to claim 14, wherein the bending and the attachment further comprise: After the compression clamp rises, the compression clamp or the lower support structure is rotated at an angle. as well as The compression clamp is lowered.

18. The method for attaching a tape according to claim 17, wherein: The end portion of the compression clamp has an isosceles triangular shape; and The horizontal width of the compression clamp is 95% to 105% of the length of one side of the regular octagon inscribed in the upper surface of the electrode assembly.

19. A secondary battery, comprising: Cylindrical electrode assembly; as well as An insulating tape is attached to the electrode assembly by a tape attachment device according to any one of claims 1 to 10.

20. The secondary battery according to claim 19, wherein the insulating strip comprises: A first region is attached to the side surface of the electrode assembly; as well as The second region bends inward from the circumference of the upper surface of the electrode assembly and attaches to the upper surface. The second region includes a plurality of folds continuously positioned along the circumference of the upper surface of the electrode assembly, and The first region of the insulating tape is free of wrinkles.

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