Button cell

Abstract

A button cell is provided. The button cell includes: an electrode assembly including a first electrode, a second electrode, and a diaphragm; a case connected to the first electrode, accommodating the electrode assembly, and having an opening exposing the electrode assembly; a cover plate connected to the housing to cover an outer boundary region of the opening, and having a through hole exposing a central region of the opening; a terminal plate connected to the second electrode, insulated from and bonded to the cap plate, and including a protruding plate protruding from a rear surface of a main plate in a direction toward the electrode assembly, the main plate covering the through hole; and a bonding layer between the cover plate and the main plate and insulating the cover plate from the main plate. The front surface of the main plate and the front surface of the cover plate are located on the same plane.

Description

Technical Field

[0001] Aspects of embodiments of the present disclosure relate to a button battery. Background Art

[0002] Generally, a rechargeable battery is a battery that can be repeatedly charged and discharged.

[0003] Recently, as the demand for wearable devices such as headphones, earphones, smart watches, and body-worn medical devices using wireless communication such as Bluetooth grows, expectations for button batteries as micro rechargeable batteries that can be installed in wearable devices are growing.

[0004] The above information disclosed in this Background section is for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not constitute the prior art. Summary of the invention

[0005] A button battery may generally include: an electrode assembly including a plurality of electrodes; a shell for accommodating the electrode assembly and connected to one electrode of the electrode assembly; a cover plate coupled to the shell and having the same polarity as that of the one electrode; and a terminal plate insulated from and bonded to the cover plate and connected to another electrode of the electrode assembly.

[0006] One or more embodiments of the present disclosure may be directed to a button battery having a reduced thickness, may facilitate bonding between an electrode assembly and a terminal plate, and / or may have improved impact resistance.

[0007] According to one or more embodiments of the present disclosure, a button battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a housing connected to the first electrode, accommodating the electrode assembly, and having an opening exposing the electrode assembly; a cover plate connected to the housing to cover an outer boundary area of ​​the opening, and having a penetration hole exposing a central area of ​​the opening; a terminal plate connected to the second electrode, insulated from and bonded to the cover plate, and including a protruding plate protruding from a rear surface of a main board in a direction toward the electrode assembly, the main board covering the penetration hole; and a bonding layer between the cover plate and the main board, insulating and bonding the cover plate to the main board. The front surface of the main board and the front surface of the cover plate are located at the same plane as each other.

[0008] In an embodiment, the electrode assembly may further include: a first electrode tab extending from the first electrode and welded to the case; and a second electrode tab extending from the second electrode and welded to the protruding plate of the terminal plate.

[0009] In an embodiment, the projection plate may include the same material as that of the second electrode tab.

[0010] In an embodiment, the projection plate may include aluminum (Al).

[0011] In an embodiment, the main panel may comprise a material different from that of the raised panel.

[0012] In an embodiment, the main board may include the same material as that of the cover board.

[0013] In an embodiment, the mainboard may comprise stainless steel.

[0014] In an embodiment, the main plate may comprise the same material as that of the raised plate.

[0015] In an embodiment, the main plate may be integral with the raised plate.

[0016] In an embodiment, the main board may include a material different from that of the cover board.

[0017] In an embodiment, the mainboard may include aluminum (Al).

[0018] In an embodiment, the bonding layer may be located at the same height from the electrode assembly as the main plate and the cap plate.

[0019] In an embodiment, the bonding layer may be located inside the penetration hole of the cover plate.

[0020] In an embodiment, the bonding layer may be located between an outer edge of the main board and an inner edge of the cover board defining the penetration hole.

[0021] In an embodiment, an outer side edge of the main plate may have a forward step shape; and an inner side edge of the cover plate may have a reverse step shape.

[0022] In an embodiment, an outer side edge of the main plate may have a reverse step shape; and an inner side edge of the cover plate may have a forward step shape.

[0023] In an embodiment, an outer side edge of the main plate may have a positively inclined shape; and an inner side edge of the cover plate may have a negatively inclined shape.

[0024] In an embodiment, an outer side edge of the main board may have a reversely inclined shape; and an inner side edge of the cover board may have a forwardly inclined shape.

[0025] In an embodiment, an outer side edge of the main board may have a protrusion and a recess; and an inner side edge of the cover board may have a protrusion and a recess.

[0026] In an embodiment, the bonding layer may have a planar annular shape.

[0027] In an embodiment, the bonding layer may include polypropylene.

[0028] In an embodiment, the thickness of the protruding plate may be thinner compared to the thickness of the main plate.

[0029] In an embodiment, the thickness of the projection plate may be thinner compared to the thickness of the cover plate.

[0030] In an embodiment, the thickness of the protruding plate may be thinner compared to the thickness of the bonding layer.

[0031] In an embodiment, the button cell may further include a rear surface insulating layer adjacent to the protruding plate and extending from the rear surface of the main plate to the rear surface of the cover plate via the rear surface of the bonding layer.

[0032] In an embodiment, the button cell may further include a front surface insulating layer corresponding to the rear surface insulating layer, the front surface insulating layer extending from the front surface of the main board to the front surface of the cover board via the front surface of the bonding layer.

[0033] According to one or more embodiments of the present disclosure, a button battery may have a reduced thickness, may facilitate bonding between an electrode assembly and a terminal plate, and / or may have improved impact resistance.

[0034] However, aspects and features of the present disclosure are not limited to the aspects and features described above. Additional aspects and features will be explained in part in the detailed description below with reference to the accompanying drawings, and may be partially apparent from them, or may be learned by practicing one or more of the presented embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The above and other aspects and features of the present disclosure will be more clearly understood from the following detailed description of illustrative, non-limiting embodiments with reference to the accompanying drawings.

[0036] Figure 1 is a perspective view showing a button battery according to an embodiment.

[0037] Figure 2 It is along Figure 1 A sectional view taken along line II-II.

[0038] Figure 3 yes Figure 2 An enlarged view of part A of FIG.

[0039] Figure 4 is a top plan view showing the front surface of a terminal plate of a button battery according to an embodiment.

[0040] Figure 5 is a top plan view showing a rear surface of a terminal plate of a button battery according to an embodiment.

[0041] Figure 6 is a cross-sectional view showing a button battery according to another embodiment.

[0042] Figure 7 yes Figure 6 An enlarged view of part B.

[0043] Figure 8 is a cross-sectional view showing a button battery according to another embodiment.

[0044] Fig. 9 yes Figure 8 An enlarged view of portion C of FIG.

[0045] Fig.10 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0046] Fig.11 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0047] Fig.12 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0048] Fig.13 is a cross-sectional view showing a portion of a button battery according to another embodiment. DETAILED DESCRIPTION

[0049] Hereinafter, the embodiments will be described in more detail with reference to the accompanying drawings, in which the same reference numerals always represent the same elements. However, the present disclosure may be implemented in various different forms and should not be construed as being limited to the embodiments shown here. On the contrary, these embodiments are provided as examples so that the present disclosure will be thorough and complete, and the aspects and features of the present disclosure will be fully conveyed to those skilled in the art. Therefore, processes, elements and techniques that are not necessary for those of ordinary skill in the art to fully understand the aspects and features of the present disclosure may not be described. Unless otherwise stated, throughout the drawings and written descriptions, the same reference numerals represent the same elements, and therefore, their redundant descriptions may not be repeated.

[0050] When a certain embodiment can be implemented differently, the specific process order may be different from the described order. For example, two processes described successively may be performed simultaneously or substantially simultaneously, or may be performed in the reverse order of the described order.

[0051] In the accompanying drawings, for the sake of clarity, the relative size, thickness and ratio of elements, layers and regions can be exaggerated and / or simplified. For ease of explanation, spatial relative terms such as "under ... ", "under ... ", "under ... ", "above ... ", "on ", etc. can be used here to describe the relationship between an element or feature as shown in the figure and another element or feature. It will be understood that, in addition to the orientation depicted in the figure, spatial relative terms are also intended to include different orientations of the device in use or operation. For example, if the device in the figure is turned over, the element described as "under" other elements or features, "under" or "below" will be oriented to "above" the other elements or features subsequently. Therefore, the example terms "under ... " and "under ... " can include two orientations above and below. The device can be oriented in addition (for example, rotated 90 degrees or in other orientations), and the spatial relative descriptors used here should be interpreted accordingly.

[0052] It will be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the scope of the present disclosure, the first element, first component, first region, first layer or first part described below may be referred to as the second element, second component, second region, second layer or second part.

[0053] It will be understood that when an element or layer is referred to as being "on," "connected to," or "bound to" another element or layer, it can be directly on, directly connected to, or directly bound to the other element or layer, or there may be one or more intervening elements or layers. Similarly, when a layer, region, or element is referred to as being "electrically connected to" another layer, region, or element, it can be directly electrically connected to the other layer, region, or element, and / or can be indirectly electrically connected to the other layer, region, or element with one or more intervening layers, regions, or elements therebetween. Additionally, it will be understood that when an element or layer is referred to as being "between" two elements or layers, it can be the only element or layer between the two elements or layers, or there may also be one or more intervening elements or layers.

[0054] The terms used here are for the purpose of describing specific embodiments, and are not intended to limit the present disclosure. As used here, unless the context clearly indicates otherwise, the singular forms "one" and "one (kind / person)" are also intended to include plural forms. It will also be understood that when the terms "include", "comprise" and "have" and their variations are used in this specification, the features, integers, steps, operations, elements and / or components stated are explained, but one or more other features, integers, steps, operations, elements, components and / or their groups are not excluded from being present or added. As used here, the term "and / or" includes any combination and all combinations of one or more of the related listed items. For example, the statement "A and / or B" means A, B or A and B. When a statement such as "at least one (kind / person) in ... is placed after a column of elements, the entire column of elements is modified, without modifying the individual elements of the column. For example, the expressions "at least one of a, b or c", "at least one of a, b and c", and "at least one selected from the group consisting of a, b and c" indicate only a, only b, only c, both a and b, both a and c, both b and c, all of a, b and c, or variations thereof.

[0055] As used herein, the terms "substantially," "approximately," and similar terms are used as terms of approximation rather than as terms of degree, and are intended to account for the inherent deviations in measurements or calculations that one of ordinary skill in the art would recognize. In addition, when describing embodiments of the present disclosure, the use of "may" refers to "one or more embodiments of the present disclosure." As used herein, the term "using" and variations thereof may be considered synonymous with the term "utilizing" and variations thereof, respectively.

[0056] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which the present disclosure belongs. It will also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and / or in this specification, and should not be interpreted in an idealized or overly formal sense unless explicitly defined as such herein.

[0057] First, refer to Figures 1 to 5 A button cell battery according to one or more embodiments is described.

[0058] The button battery according to the embodiment may include a coin battery, which may be an ultra-small rechargeable battery, but the present disclosure is not limited thereto, and may include a cylindrical or pin-type battery.

[0059] As used herein, a button cell may be a thin coin-shaped or button-shaped cell, and may refer to a cell having a height to diameter ratio of 1 or less, but the present disclosure is not limited thereto. A button cell is generally cylindrical so that a cross section in the horizontal direction is circular, but the present disclosure is not limited thereto, and a cross section in the horizontal direction may be elliptical or polygonal. As used herein, a diameter may refer to the maximum distance of a cell in the horizontal direction, and a height may refer to the maximum distance of a cell in the vertical direction (e.g., the distance from a flat bottom surface to a flat top surface).

[0060] Figure 1 is a perspective view showing a button battery according to an embodiment. Figure 2 It is along Figure 1 A sectional view taken along line II-II.

[0061] Reference Figure 1 and Figure 2 The button cell 1000 according to the embodiment may be a rechargeable battery capable of repeated charge and discharge. The button cell 1000 may include an electrode assembly 100, a case 200, a cap plate 300, a terminal plate 400, a bonding layer 500, and a rear surface insulating layer 600.

[0062] The electrode assembly 100 is accommodated in the case 200. The lower portion of the electrode assembly 100 faces the bottom of the case 200, and the upper portion of the electrode assembly 100 faces the cap plate 300, the terminal plate 400, and the bonding layer 500 covering the opening 210 of the case 200. The upper and lower portions of the electrode assembly 100 may have planar shapes that are parallel or substantially parallel to each other, but the present disclosure is not limited thereto.

[0063] The electrode assembly 100 includes a first electrode 110 , a second electrode 120 , a separator 130 , a first electrode tab 140 , and a second electrode tab 150 .

[0064] The first electrode 110 and the second electrode 120 are spaced apart from each other, and the separator 130 including an insulating material is positioned between the first electrode 110 and the second electrode 120. The first electrode 110 may be a cathode, and the second electrode 120 may be a cathode, but the present disclosure is not limited thereto. For example, the first electrode 110 may be a cathode, and the second electrode 120 may be a cathode.

[0065] The first electrode 110 has a strip shape extending in one direction. The first electrode 110 may include a negative electrode coating portion, which is a region where a negative electrode active material layer is coated on a current collector of a metal foil (e.g., Cu foil), and a negative electrode uncoated portion, which is a region where an active material is not coated. The negative electrode uncoated portion may be positioned at one end of the first electrode 110 in the extending direction.

[0066] The second electrode 120 has a strip shape that is spaced apart from the first electrode 110 and interposes the separator 130 therebetween and extends in one direction. The second electrode 120 may include a positive electrode coating portion, which is a region where a positive electrode active material layer is coated on a current collector of a metal foil (e.g., Al foil), and a positive electrode uncoated portion, which is a region where an active material is not coated. The positive electrode uncoated portion may be positioned at one end of the second electrode 120 in the extending direction.

[0067] The separator 130 extends in one direction between the first electrode 110 and the second electrode 120 to prevent a short circuit between the first electrode 110 and the second electrode 120 .

[0068] The first electrode 110, the separator 130, and the second electrode 120 are sequentially stacked and wound into a core shape, but the present disclosure is not limited thereto and may be formed in various suitable shapes. Each of the first electrode 110, the second electrode 120, and the separator 130 may include various suitable materials.

[0069] The first electrode tab 140 extends from the first electrode 110 of the electrode assembly 100 to the housing 200. The first electrode tab 140 is connected to (e.g., attached to or bonded to) the bottom of the housing 200, and connects the first electrode 110 and the housing 200 to each other. The first electrode tab 140 contacts the first electrode 110 and the housing 200. The first electrode tab 140 may be welded to the bottom of the housing 200, but the present disclosure is not limited thereto, and the first electrode tab 140 may contact the bottom of the housing 200. Through the first electrode tab 140, the housing 200 and the cap plate 300 may have the same polarity as that of the first electrode 110.

[0070] The second electrode tab 150 extends from the second electrode 120 of the electrode assembly 100 to the terminal plate 400. The second electrode tab 150 may be connected to (e.g., attached to or bonded to) the protruding plate 420 of the terminal plate 400, and connect the second electrode 120 and the terminal plate 400 to each other. The second electrode tab 150 contacts the second electrode 120 and the terminal plate 400. The second electrode tab 150 may be welded to the surface of the protruding plate 420 of the terminal plate 400, but the present disclosure is not limited thereto, and may contact the surface of the protruding plate 420. Through the second electrode tab 150, the terminal plate 400 may have the same polarity as that of the second electrode 120.

[0071] A center pin passing through the center of the electrode assembly 100 in a vertical direction may be positioned at a central portion of the electrode assembly 100. The center pin may support the first and second electrode tabs 140 and 150, but the present disclosure is not limited thereto.

[0072] The housing 200 is connected to the first electrode 110 of the electrode assembly 100 and accommodates the electrode assembly 100. The housing 200 includes an opening 210 that exposes the upper portion of the electrode assembly 100. The bottom of the housing 200 may be welded to the first electrode tab 140 and connected to the first electrode 110 of the electrode assembly 100, and thus the housing 200 may have the same polarity as that of the first electrode 110. The housing 200 may have a can shape in a cylindrical shape to accommodate the electrode assembly 100 in a core shape, but the present disclosure is not limited thereto, and may have various suitable shapes. The housing 200 may accommodate various suitable electrolytes together with the electrode assembly 100. The outer surface of the housing 200 and the outer surface of the cap plate 300 may be the first electrode terminal of the button battery 1000, but the present disclosure is not limited thereto. The upper surface of the main board 410, which is the outer surface of the terminal plate 400, may be the second electrode terminal of the button battery 1000, but the present disclosure is not limited thereto. A plating layer may be coated on the outer surface of the housing 200, but the disclosure is not limited thereto, and various suitable coating layers may be coated on the outer surface of the housing 200. The housing 200 may include stainless steel, but the disclosure is not limited thereto, and may include various known metals.

[0073] The opening 210 of the case 200 may be covered by the cap plate 300 , the terminal plate 400 , and the bonding layer 500 .

[0074] Figure 3 yes Figure 2 An enlarged view of part A of FIG.

[0075] Reference Figure 2 and Figure 3 , the cover plate 300 is coupled to the housing 200 and covers the outer boundary area of ​​the opening 210. The cover plate 300 includes a penetration hole 310 exposing the central area of ​​the opening 210. The cover plate 300 may be directly coupled to the side wall of the housing 200 forming the opening 210 of the housing 200 by welding or the like, and covers the outer boundary area of ​​the opening 210. The cover plate 300 has an annular shape in a plan view by the penetration hole 310 formed in the center, but the present disclosure is not limited thereto. The cover plate 300 is coupled to the housing 200 and has the same polarity as the polarity of the first electrode 110. Therefore, the cover plate 300 and the housing 200 may have the same polarity as the polarity of the first electrode 110. The front surface 301 of the cover plate 300, which is the outer surface of the cover plate 300, may be the first electrode terminal of the button battery 1000, but the present disclosure is not limited thereto. The cover plate 300 is insulated from the terminal plate 400 and coupled to the terminal plate 400 by inserting the bonding layer 500. The cap plate 300 includes stainless steel, but the present disclosure is not limited thereto and may include various suitable metals.

[0076] Figure 4 is a top plan view showing the front surface of a terminal plate of a button battery according to an embodiment. Figure 5 is a top plan view showing a rear surface of a terminal plate of a button battery according to an embodiment.

[0077] Reference Figures 2 to 5 , the terminal plate 400 is connected to the second electrode 120, and is insulated from the cap plate 300 and bonded to the cap plate 300 by the bonding layer 500. The terminal plate 400 covers the penetration hole 310 of the cap plate 300. The terminal plate 400 is positioned at the same or substantially the same height as the electrode assembly 100 and the cap plate 300, and the bonding layer 500 is positioned between the terminal plate 400 and the cap plate 300. The terminal plate 400 covers the central area of ​​the opening 210 of the housing 200 exposed by the penetration hole 310 of the cap plate 300. The terminal plate 400 covers the central area of ​​the opening 210, the cap plate 300 covers the outer boundary area of ​​the opening 210, and the bonding layer 500 is positioned between the terminal plate 400 and the cap plate 300. In this way, the opening 210 of the housing 200 is completely covered by the terminal plate 400, the cap plate 300 and the bonding layer 500. The terminal plate 400 securely seals the electrode assembly 100 together with the case 200, the cap plate 300, and the bonding layer 500. The terminal plate 400 is coupled to the second electrode tab 150 of the electrode assembly 100 and is connected to the second electrode 120 of the electrode assembly 100. The terminal plate 400 may have the same polarity as that of the second electrode 120.

[0078] The terminal plate 400 includes a main plate 410 and a protruding plate 420 .

[0079] The main board 410 is positioned in the penetration hole 310 of the cover plate 300. The main board 410 may be completely positioned inside the penetration hole 310 of the cover plate 300, but the present disclosure is not limited thereto. The main board 410 may not overlap with the cover plate 300 in the vertical direction as the thickness direction of the button battery 1000 (for example, not overlap with the cover plate 300), and cover the penetration hole 310 of the cover plate 300. The main board 410 has a wider area than the area of ​​the protruding plate 420. The main board 410 may have a larger diameter than the diameter of the protruding plate 420. The main board 410 has a thicker thickness than the thickness of the protruding plate 420, but the present disclosure is not limited thereto. For example, the second thickness T2 of the main board 410 may be thicker than the first thickness T1 of the protruding plate 420. The front surface 411 of the main board 410 may be the second electrode terminal of the button battery 1000, and the rear surface 412 of the main board 410 contacts the protruding plate 420. The main board 410 is insulated from the cover board 300 and bonded to the cover board 300 through the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the cover board 300 forming the penetration hole 310 of the cover board 300, and thus the bonding layer 500 is interposed therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover board 300 through the bonding layer 500.

[0080] The front surface 411 of the main board 410 may be positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface 411 of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Because the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 are positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1000 may be formed to be relatively thin.

[0081] The main board 410 includes a material different from that of the protruding plate 420. For example, the main board 410 may include the same material as that of the cap plate 300, and the main board 410 may include the same stainless steel as that of the cap plate 300. As another example, the main board 410 may include a material having greater strength than that of the protruding plate 420. As another example, the protruding plate 420 may include aluminum to facilitate bonding to the second electrode tab 150 by welding, and the main board 410 may include stainless steel, which is a material having greater strength than that included in the protruding plate 420, so that the impact resistance of the button battery 1000 may be improved. Since the main board 410 includes a different material than that of the protruding plate 420, the impact resistance of the button battery 1000 may be improved.

[0082] The protruding plate 420 is coupled to the rear surface 412 of the main plate 410 .

[0083] The protruding plate 420 protrudes from the rear surface 412 of the main board 410 in a direction toward the electrode assembly 100. The protruding plate 420 may be joined to the rear surface 412 of the main board 410 by welding, but the present disclosure is not limited thereto, and may protrude from the rear surface 412 of the main board 410 to the electrode assembly 100 by various suitable joining methods and bonding methods. The protruding plate 420 is connected to the second electrode 120. The surface of the protruding plate 420 is bonded to the second electrode tab 150. The surface of the protruding plate 420 may be welded to the second electrode tab 150, but the present disclosure is not limited thereto. Because the protruding plate 420 is bonded to the second electrode tab 150, the protruding plate 420 of the terminal plate 400 and the main board 410 may have the same polarity as that of the second electrode 120. The surface of the protruding plate 420 bonded to the second electrode tab 150 may have a smaller diameter than the front surface 411 of the main board 410, which may be an electrode terminal. The protruding plate 420 and the main plate 410 are coupled to each other, but the present disclosure is not limited thereto and may be integrally formed together by using a forging process or the like.

[0084] The protruding plate 420 includes the same material as that of the second electrode tab 150. For example, the protruding plate 420 and the second electrode tab 150 may include aluminum. As another example, the protruding plate 420 may include a material having greater weldability with respect to the second electrode tab 150 compared to the main board 410. As another example, the protruding plate 420 may include aluminum, which is a material having greater weldability with respect to the second electrode tab 150, and the main board 410 may include stainless steel, which is a material having greater strength than that included in the protruding plate 420, so that the impact resistance of the button battery 1000 may be improved. Because the protruding plate 420 includes the same material as that of the second electrode tab 150, and the main board 410 includes a different material than that of the protruding plate 420, the bonding between the electrode assembly 100 and the terminal plate 400 may be facilitated, and the impact resistance of the button battery 1000 may be improved.

[0085] For example, the first thickness T1 of the protruding plate 420 may be thinner than the second thickness T2 of the main board 410. As another example, the first thickness T1 of the protruding plate 420 may be thinner than the third thickness T3 of the cap plate 300. As another example, the first thickness T1 of the protruding plate 420 may be thinner than the thickness of the bonding layer 500. Because the first thickness T1 of the protruding plate 420 may be thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cap plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly 100 to the terminal plate 400 may be reduced or minimized, and thus, the thickness of the button battery 1000 may be formed to be relatively thin.

[0086] A plating layer may be coated on the outer surface of the terminal plate 400 including the protruding plate 420 and the main plate 410, but the present disclosure is not limited thereto, and various suitable coating layers may be coated on the outer surface of the terminal plate 400. The main plate 410 of the terminal plate 400 may include stainless steel, and the protruding plate 420 may include aluminum, but the present disclosure is not limited thereto, and the main plate 410 and the protruding plate 420 may each include various suitable metals.

[0087] Reference Figures 1 to 4 , the bonding layer 500 is positioned between the main board 410 of the terminal plate 400 and the cover plate 300. The bonding layer 500 insulates and bonds the cover plate 300 to the terminal plate 400. The bonding layer 500 includes an insulating material and insulates the cover plate 300 to the terminal plate 400. The bonding layer 500 may be thermally bonded between the main board 410 of the terminal plate 400 and the cover plate 300 by using heat, a laser beam, etc., but the present disclosure is not limited thereto. The bonding layer 500 includes a polypropylene resin, but the present disclosure is not limited thereto, and may include various suitable resins for insulation and bonding between the cover plate 300 and the terminal plate 400. Because the bonding layer 500 bonds the cover plate 300 and the terminal plate 400 to each other, the opening 210 of the housing 200 accommodating the electrode assembly 100 is completely sealed by the cover plate 300, the terminal plate 400, and the bonding layer 500.

[0088] For example, the bonding layer 500 may include at least one of a thermosetting resin and a thermoplastic resin. At least one of the thermosetting resin and the thermoplastic resin included in the bonding layer 500 may be stacked into a plurality of layers, but the present disclosure is not limited thereto. The thermosetting resin that may be included in the bonding layer 500 may be in a thermosetting state, and may include various suitable thermosetting resins, such as phenolic resins, urea resins, melamine resins, epoxy resins, polyester resins, and the like. The thermoplastic resin that may be included in the bonding layer 500 includes a polypropylene resin that melts at a suitable temperature (e.g., a predetermined temperature), but the present disclosure is not limited thereto, and may include various suitable thermoplastic resins, such as polystyrene resins, polyethylene resins, polyvinyl chloride resins, and the like.

[0089] The bonding layer 500 is positioned between the main board 410 of the terminal plate 400 and the cover plate 300 at a height that is the same or substantially the same as the height of the electrode assembly 100, the main board 410 and the cover plate 300. The bonding layer 500 is positioned between the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 forming the penetration hole 310, and the bonding layer 500 is bonded between the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. The bonding layer 500 is positioned inside the penetration hole 310 of the cover plate 300. For example, the bonding layer 500 may be completely positioned inside the penetration hole 310 of the cover plate 300. The bonding layer 500 has an annular shape in a plan view, but the present disclosure is not limited thereto. For example, the bonding layer 500 may have a planar shape corresponding to at least one of the shapes of the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410.

[0090] Because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at the same or substantially the same height as the main board 410 and the cover plate 300, the bonding layer 500 can be prevented from being separated from between the main board 410 and the cover plate 300 due to external impact, thereby improving the impact resistance of the button battery 1000.

[0091] Reference Figure 2 , Figure 3 and Figure 5 , the rear surface insulating layer 600 is adjacent to the protruding plate 420 on the rear surface 412 of the main board 410. The rear surface insulating layer 600 is adjacent to the protruding plate 420 and extends from the rear surface 412 of the main board 410 to the rear surface 302 of the cover plate 300 via the rear surface of the bonding layer 500. The rear surface insulating layer 600 includes a first sub-rear surface insulating layer 610 and a second sub-rear surface insulating layer 620. The second sub-rear surface insulating layer 620 is positioned between the first sub-rear surface insulating layer 610 and each of the main board 410, the bonding layer 500, and the cover plate 300. The second sub-rear surface insulating layer 620 may include a resin having higher adhesion than the resin of the first sub-rear surface insulating layer 610, but the present disclosure is not limited thereto.

[0092] Since the rear surface insulating layer 600 extends from the projection plate 420 to the rear surface 302 of the cap plate 300 , the second electrode tab 150 may be prevented from being short-circuited with the cap plate 300 .

[0093] According to an embodiment, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cap plate 300 may be positioned at the same plane FP as each other (eg, middle or upper), and thus the thickness of the button battery 1000 may be formed to be thinner.

[0094] In addition, according to an embodiment, because the main board 410 of the terminal plate 400 includes a material different from the material of the protruding plate 420, the main board 410 may include a material having greater strength than the material of the protruding plate 420, and the protruding plate 420 may include the same material as the second electrode tab 150 of the electrode assembly 100, thereby facilitating the bonding between the electrode assembly 100 and the terminal plate 400 and improving the impact resistance of the button battery 1000.

[0095] In addition, according to an embodiment, since the first thickness T1 of the protruding plate 420 is thin compared to the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly 100 to the terminal plate 400 can be minimized or reduced, and therefore, the thickness of the button battery 1000 can be formed to be relatively thin.

[0096] In addition, according to an embodiment, since the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at a height that is the same as or substantially the same as the heights of the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to an external impact, and thus, the impact resistance of the button battery 1000 can be improved.

[0097] For example, the button battery 1000 having a reduced thickness, facilitating bonding between the electrode assembly 100 and the terminal plate 400 , and / or improving impact resistance may be provided.

[0098] In the following, reference will be made to Figure 6 and Figure 7 A button cell according to another embodiment is described.

[0099] In the following, reference may be mainly described Figure 6 and Figure 7 Differences between the button battery and the button battery according to one or more embodiments described above are described in more detail, and a redundant description may not be repeated.

[0100] Figure 6 is a cross-sectional view showing a button battery according to another embodiment. Figure 7 yes Figure 6 An enlarged view of part B.

[0101] Reference Figure 6 and Figure 7 The button cell 1002 according to the present embodiment may include an electrode assembly 100 , a case 200 , a cap plate 300 , a terminal plate 400 , a bonding layer 500 , and a rear surface insulating layer 600 .

[0102] The terminal plate 400 includes a main plate 410 and a protruding plate 420 that are integrated with each other (eg, integrally formed with each other).

[0103] The main board 410 is positioned in the penetration hole 310 of the cover plate 300. The main board 410 may be completely positioned inside the penetration hole 310 of the cover plate 300, but the present disclosure is not limited thereto. The main board 410 may not overlap with the cover plate 300 in the vertical direction as the thickness direction of the button battery 1002 (e.g., not overlap with the cover plate 300), and cover the penetration hole 310 of the cover plate 300. The main board 410 has an area wider than that of the protruding plate 420. The main board 410 may have a larger diameter than that of the protruding plate 420. The main board 410 has a thickness thicker than that of the protruding plate 420, but the present disclosure is not limited thereto. For example, the second thickness T2 of the main board 410 is thicker than the first thickness T1 of the protruding plate 420. The front surface 411 of the main board 410 may be a second electrode terminal of the button battery 1002, and the protruding plate 420 extending from the main board 410 is positioned on the rear surface 412 of the main board 410. The main board 410 is insulated from the cover plate 300 and bonded to the cover plate 300 through the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the cover plate 300 forming the penetration hole 310 of the cover plate 300, and thus the bonding layer 500 is inserted therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover plate 300 through the bonding layer 500.

[0104] The front surface 411 of the main board 410 is positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Because the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 are positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1002 can be formed to be relatively thin.

[0105] The main board 410 includes the same material as that of the protruding plate 420. For example, the main board 410 may include the same material as that of the protruding plate 420, and the main board 410 may include aluminum that is the same as that of the protruding plate 420. The main board 410 may include a material different from that of the cover plate 300. The main board 410 may include aluminum and the cover plate 300 may include stainless steel, but the present disclosure is not limited thereto, and the main board 410 and the cover plate 300 may include various suitable metals.

[0106] The protruding plate 420 protrudes on the rear surface 412 of the main board 410 in a direction from the main board 410 toward the electrode assembly 100 .

[0107] The protruding plate 420 protrudes in a direction from the rear surface 412 of the main board 410 toward the electrode assembly 100, and may be connected to the second electrode 120. The surface of the protruding plate 420 is bonded to the second electrode tab 150. The surface of the protruding plate 420 may be welded to the second electrode tab 150, but the present disclosure is not limited thereto. Since the protruding plate 420 is bonded to the second electrode tab 150, the terminal plate 400 in which the protruding plate 420 and the main board 410 are integrated with each other may have the same polarity as the polarity of the second electrode 120. The surface of the protruding plate 420 bonded to the second electrode tab 150 may have a smaller diameter than the diameter of the front surface 411 of the main board 410, which may be an electrode terminal. The protruding plate 420 and the main board 410 may be formed integrally with each other using a forging process or the like.

[0108] The protruding plate 420 includes the same material as that of the second electrode tab 150. For example, the protruding plate 420 and the second electrode tab 150 may include aluminum. Since the protruding plate 420 includes the same material as that of the second electrode tab 150, the bonding between the electrode assembly 100 and the terminal plate 400 may be relatively easy.

[0109] For example, the first thickness T1 of the protruding plate 420 may be thinner than the second thickness T2 of the main plate 410. As another example, the first thickness T1 of the protruding plate 420 may be thinner than the third thickness T3 of the cap plate 300. As another example, the first thickness T1 of the protruding plate 420 may be thinner than the thickness of the bonding layer 500. Because the first thickness T1 of the protruding plate 420 may be thinner than the second thickness T2 of the main plate 410, the third thickness T3 of the cap plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly 100 to the terminal plate 400 may be minimized or reduced, and therefore, the thickness of the button battery 1002 may be formed to be relatively thin.

[0110] The main plate 410 and the protruding plate 420 of the terminal plate 400 may include aluminum, but the present disclosure is not limited thereto, and the main plate 410 and the protruding plate 420 may each include various suitable metals.

[0111] According to an embodiment, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cap plate 300 may be positioned at the same plane FP as each other (eg, middle or upper), and thus the thickness of the button battery 1002 may be formed to be thinner.

[0112] In addition, according to the embodiment, the main plate 410 and the protruding plate 420 of the terminal plate 400 may include the same material as the second electrode tab 150 of the electrode assembly 100 , and thus, the coupling between the electrode assembly 100 and the terminal plate 400 may be easier.

[0113] In addition, according to an embodiment, since the first thickness T1 of the protruding plate 420 is thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly 100 to the terminal plate 400 can be minimized or reduced, and thus, the thickness of the button battery 1002 can be formed to be thinner.

[0114] In addition, according to an embodiment, because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramics or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at a height that is the same as or substantially the same as the heights of the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to external impact, and therefore, the impact resistance of the button battery 1002 can be improved.

[0115] For example, it is possible to provide a button cell 1002 having a reduced thickness, facilitating bonding between the electrode assembly 100 and the terminal plate 400 , and improving impact resistance.

[0116] In the following, reference will be made to Figure 8 and Fig. 9 A button cell according to another embodiment is described.

[0117] Hereinafter, differences between a button battery according to still another embodiment and the button battery according to the above-described embodiment will be described.

[0118] Figure 8 is a cross-sectional view showing a button battery according to another embodiment. Fig. 9 yes Figure 8 An enlarged view of portion C of FIG.

[0119] Reference Figure 8 and Fig. 9 According to another embodiment, a button cell 1003 may include an electrode assembly 100 , a case 200 , a cap plate 300 , a terminal plate 400 , a bonding layer 500 , a rear surface insulating layer 600 , and a front surface insulating layer 700 .

[0120] The front surface 411 of the main board 410 of the terminal board 400 may be a second electrode terminal of the button battery 1003, and the rear surface 412 of the main board 410 contacts the protruding plate 420. The main board 410 is insulated from and bonded to the cover plate 300 through the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the penetration hole 310 of the cover plate 300, and thus the bonding layer 500 is inserted therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover plate 300 through the bonding layer 500.

[0121] The outer side edge 413 of the main board 410 may have a positive step shape, and the inner side edge 303 of the cover plate 300 may have a reverse step shape. For example, the positive step shape of the outer side edge 413 of the main board 410 and the reverse step shape of the inner side edge 303 of the cover plate 300 may be a longitudinal section form, but the present disclosure is not limited thereto, and may be a transverse section form or a section form according to an imaginary straight line or an imaginary surface.

[0122] Because the outer edge 413 of the main board 410 has a positive step shape, the inner edge 303 of the cover plate 300 has a reverse step shape, and the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 are bonded to each other through the bonding layer 500, the bonding area between the bonding layer 500 and the main board 410 of the terminal plate 400 can be increased, and the bonding area between the bonding layer 500 and the cover plate 300 can be increased. Therefore, the bonding strength between the main board 410 and the cover plate 300 can be improved, and the impact resistance of the button battery 1003 can be improved.

[0123] The front surface 411 of the main board 410 is positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Because the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 are positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1003 can be formed to be relatively thin.

[0124] The bonding layer 500 may be positioned between the main board 410 of the terminal plate 400 and the cap plate 300 at a height that is the same or substantially the same as the height of the electrode assembly 100, the main board 410, and the cap plate 300. The bonding layer 500 may be positioned between the outer edge 413 of the main board 410 and the inner edge 303 of the cap plate 300 forming the penetration hole 310, and the bonding layer 500 is bonded between the inner edge 303 of the cap plate 300 and the outer edge 413 of the main board 410. The bonding layer 500 may be positioned inside the penetration hole 310 of the cap plate 300. For example, the bonding layer 500 may be completely positioned inside the penetration hole 310 of the cap plate 300. The bonding layer 500 has an annular shape in a plan view, but the present disclosure is not limited thereto. For example, the bonding layer 500 may have a cross-sectional form corresponding to at least one cross-sectional form among the inner edge 303 of the cap plate 300 and the outer edge 413 of the main board 410. As another example, the bonding layer 500 may have a planar shape corresponding to at least one of the inner edge 303 of the cover plate 300 and the outer edge 413 of the main plate 410 .

[0125] The front surface insulating layer 700 is positioned on the front surface 411 of the main board 410, and may correspond to (e.g., overlap with) the rear surface insulating layer 600. The front surface insulating layer 700 extends from the front surface 411 of the main board 410 to the front surface of the cover plate 300 via the front surface of the bonding layer 500, and may correspond to the rear surface insulating layer 600. The front surface insulating layer 700 may include one layer or a plurality of layers. Since the front surface insulating layer 700 extends from a portion of the front surface 411 of the main board 410 to the front surface of the cover plate 300, the main board 410 and the cover plate 300 may be prevented from short-circuiting each other.

[0126] According to one or more embodiments, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (eg, middle or top), and thus the thickness of the button battery 1003 may be formed to be thinner.

[0127] According to one or more embodiments, since the main board 410 of the terminal plate 400 may include a material different from that of the protruding plate 420, the main board 410 may include a material having greater strength than that of the protruding plate 420, and the protruding plate 420 may include the same material as that of the second electrode tab 150 of the electrode assembly 100. Therefore, the bonding between the electrode assembly 100 and the terminal plate 400 may be facilitated, and the impact resistance of the button battery 1003 may be improved.

[0128] According to one or more embodiments, since the first thickness T1 of the protruding plate 420 can be thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly 100 to the terminal plate 400 can be minimized or reduced, and thus, the thickness of the button battery 1003 can be formed to be thinner.

[0129] According to one or more embodiments, because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at a height that is the same as or substantially the same as the heights of the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to external impact, and thus, the impact resistance of the button battery 1003 can be improved.

[0130] According to one or more embodiments, since the bonding area between the cap plate 300 and the main board 410 of the terminal plate 400 can be increased, the bonding strength between the main board 410 and the cap plate 300 can be improved, and the impact resistance of the button battery 1003 can be improved.

[0131] For example, it is possible to provide a button cell 1003 having a reduced thickness, facilitating bonding between the electrode assembly 100 and the terminal plate 400 , and improving impact resistance.

[0132] In the following, reference will be made to Fig.10 A button cell according to another embodiment is described.

[0133] In the following, the following description may be made in more detail with reference to Fig.10 Differences between the button battery and the button battery according to one or more embodiments described above are described in more detail, and a redundant description may not be repeated.

[0134] Fig.10 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0135] Reference Fig.10 According to another embodiment, a button cell 1004 may include an electrode assembly, a case 200 , a cap plate 300 , a terminal plate 400 , a bonding layer 500 , a rear surface insulating layer 600 , and a front surface insulating layer 700 .

[0136] The front surface 411 of the main board 410 of the terminal board 400 may be a second electrode terminal of the button battery 1004, and the rear surface 412 of the main board 410 contacts the protruding plate 420. The main board 410 is insulated from and bonded to the cover plate 300 by the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the penetration hole 310 of the cover plate 300, and thus the bonding layer 500 is inserted therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover plate 300 by the bonding layer 500.

[0137] The outer side edge 413 of the main board 410 may have a reverse step shape, and the inner side edge 303 of the cover plate 300 may have a forward step shape. For example, the reverse step shape of the outer side edge 413 of the main board 410 and the forward step shape of the inner side edge 303 of the cover plate 300 may be a longitudinal section form, but the present disclosure is not limited thereto, and may be a transverse section form or a section form according to an imaginary straight line or an imaginary surface.

[0138] Because the outer edge 413 of the main board 410 has a reverse step shape, the inner edge 303 of the cover plate 300 has a forward step shape, and the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 are bonded to each other through the bonding layer 500, it is possible to increase the bonding area between the bonding layer 500 and the main board 410 of the terminal board 400 and the bonding area between the bonding layer 500 and the cover plate 300. Therefore, the bonding strength between the main board 410 and the cover plate 300 can be improved, and the impact resistance of the button battery 1004 can be improved.

[0139] The front surface 411 of the main board 410 may be positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Since the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1004 may be formed to be thin.

[0140] The bonding layer 500 may be positioned between the main board 410 of the terminal board 400 and the cover plate 300 at a height that is the same or substantially the same as the height of the electrode assembly, the main board 410, and the cover plate 300. The bonding layer 500 is positioned between the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 forming the penetration hole 310, and the bonding layer 500 is bonded between the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. The bonding layer 500 may be positioned inside the penetration hole 310 of the cover plate 300. For example, the bonding layer 500 may be completely positioned inside the penetration hole 310 of the cover plate 300. The bonding layer 500 has an annular shape in a plan view, but the present disclosure is not limited thereto. For example, the bonding layer 500 may have a cross-sectional form corresponding to at least one cross-sectional form among the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. As another example, the bonding layer 500 may have a planar shape corresponding to at least one planar shape among the inner edge 303 of the cover plate 300 and the outer edge 413 of the main plate 410 .

[0141] The front surface insulating layer 700 is positioned on the front surface 411 of the main board 410, and may correspond to the rear surface insulating layer 600 (e.g., may overlap with the rear surface insulating layer 600). The front surface insulating layer 700 extends from the front surface 411 of the main board 410 to the front surface of the cover plate 300 via the front surface of the bonding layer 500, and may correspond to the rear surface insulating layer 600. The front surface insulating layer 700 may include one layer or a plurality of layers. Since the front surface insulating layer 700 extends from a portion of the front surface 411 of the main board 410 to the front surface of the cover plate 300, the main board 410 and the cover plate 300 may be prevented from short-circuiting each other.

[0142] According to one or more embodiments, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (eg, middle or top), and thus, the thickness of the button battery 1004 may be formed to be thinner.

[0143] According to one or more embodiments, because the main board 410 of the terminal plate 400 includes a material different from the material of the protruding plate 420, the main board 410 may include a material having greater strength than the material of the protruding plate 420, and the protruding plate 420 may include a material that is the same as the material of the second electrode tab 150 of the electrode assembly, thereby facilitating the bonding between the electrode assembly and the terminal plate 400, and improving the impact resistance of the button battery 1004.

[0144] According to one or more embodiments, because the first thickness T1 of the protruding plate 420 is thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly to the terminal plate 400 can be minimized or reduced, and therefore, the thickness of the button battery 1004 can be formed to be thinner.

[0145] According to one or more embodiments, because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at a height that is the same as or substantially the same as the heights of the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to external impact, and thus, the impact resistance of the button battery 1004 can be improved.

[0146] According to one or more embodiments, since the bonding area between the cap plate 300 and the main board 410 of the terminal plate 400 can be increased, the bonding strength between the main board 410 and the cap plate 300 can be improved, and the impact resistance of the button battery 1004 can be improved.

[0147] For example, the button cell 1004 having a reduced thickness, facilitating bonding between the electrode assembly and the terminal plate 400 , and improving impact resistance may be provided.

[0148] In the following, reference will be made to Fig.11 A button cell according to another embodiment is described.

[0149] In the following, reference will be described in more detail Fig.11 Differences between the button battery and the button battery according to one or more embodiments described above are described in more detail, and a redundant description may not be repeated.

[0150] Fig.11 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0151] Reference Fig.11 According to another embodiment, a button cell 1005 may include an electrode assembly, a case 200 , a cap plate 300 , a terminal plate 400 , a bonding layer 500 , a rear surface insulating layer 600 , and a front surface insulating layer 700 .

[0152] The front surface 411 of the main board 410 of the terminal board 400 may be a second electrode terminal of the button battery 1005, and the rear surface 412 of the main board 410 contacts the protruding plate 420. The main board 410 is insulated from and bonded to the cover plate 300 through the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the penetration hole 310 of the cover plate 300, thereby inserting the bonding layer 500 therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover plate 300 through the bonding layer 500.

[0153] The outer side edge 413 of the main board 410 may have a positively inclined shape, and the inner side edge 303 of the cover plate 300 may have a reversely inclined shape. For example, the positively inclined shape of the outer side edge 413 of the main board 410 and the reversely inclined shape of the inner side edge 303 of the cover plate 300 may be in a longitudinal cross-sectional form, but the present disclosure is not limited thereto, and may be in a transverse cross-sectional form or a cross-sectional form according to an imaginary straight line or an imaginary surface.

[0154] Because the outer edge 413 of the main board 410 has a positively inclined shape, the inner edge 303 of the cover plate 300 has a reversely inclined shape, and the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 are bonded to each other through the bonding layer 500, it is possible to increase the bonding area between the bonding layer 500 and the main board 410 of the terminal board 400 and the bonding area between the bonding layer 500 and the cover plate 300. Therefore, the bonding strength between the main board 410 and the cover plate 300 can be improved, and the impact resistance of the button battery 1005 can be improved.

[0155] The front surface 411 of the main board 410 is positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Because the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 are positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1005 can be formed to be thin.

[0156] The bonding layer 500 may be positioned between the main board 410 of the terminal board 400 and the cover plate 300 at a height that is the same or substantially the same as the height of the electrode assembly, the main board 410, and the cover plate 300. The bonding layer 500 is positioned between the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 forming the penetration hole 310, and the bonding layer 500 is bonded between the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. The bonding layer 500 may be positioned inside the penetration hole 310 of the cover plate 300. For example, the bonding layer 500 may be completely positioned inside the penetration hole 310 of the cover plate 300. The bonding layer 500 has an annular shape in a plan view, but the present disclosure is not limited thereto. For example, the bonding layer 500 may have a cross-sectional form corresponding to at least one cross-sectional form among the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. As another example, the bonding layer 500 may have a planar shape corresponding to at least one of the inner edge 303 of the cover plate 300 and the outer edge 413 of the main plate 410 .

[0157] The front surface insulating layer 700 is positioned on the front surface 411 of the main board 410, and may correspond to the rear surface insulating layer 600 (e.g., may overlap with the rear surface insulating layer 600). The front surface insulating layer 700 extends from the front surface 411 of the main board 410 to the front surface of the cover plate 300 via the front surface of the bonding layer 500, and may correspond to the rear surface insulating layer 600. The front surface insulating layer 700 may include one layer or a plurality of layers. Since the front surface insulating layer 700 extends from a portion of the front surface 411 of the main board 410 to the front surface of the cover plate 300, the main board 410 and the cover plate 300 may be prevented from short-circuiting each other.

[0158] According to one or more embodiments, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (eg, middle or top), and thus, the thickness of the button battery 1005 may be formed to be thinner.

[0159] According to one or more embodiments, because the main board 410 of the terminal plate 400 includes a material different from the material of the protruding plate 420, the main board 410 may include a material having greater strength than the material of the protruding plate 420, and the protruding plate 420 may include the same material as the second electrode tab 150 of the electrode assembly, thereby facilitating the bonding between the electrode assembly and the terminal plate 400 and improving the impact resistance of the button battery 1005.

[0160] According to one or more embodiments, because the first thickness T1 of the protruding plate 420 is thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly to the terminal plate 400 can be minimized or reduced, and therefore, the thickness of the button battery 1005 can be formed to be thinner.

[0161] According to one or more embodiments, because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at a height that is the same as or substantially the same as the heights of the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to external impact, and thus, the impact resistance of the button battery 1005 can be improved.

[0162] According to one or more embodiments, since the bonding area between the cap plate 300 and the main board 410 of the terminal plate 400 can be increased, the bonding strength between the main board 410 and the cap plate 300 can be improved, and the impact resistance of the button battery 1005 can be improved.

[0163] For example, a button cell 1005 having a reduced thickness, facilitating bonding between the electrode assembly and the terminal plate 400 , and improving impact resistance may be provided.

[0164] In the following, reference will be made to Fig.12 A button cell according to another embodiment is described.

[0165] In the following, reference may be described in more detail Fig.12 Differences between the button battery and the button battery according to one or more embodiments described above are described in more detail, and a redundant description may not be repeated.

[0166] Fig.12 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0167] Reference Fig.12 According to another embodiment, a button cell 1006 may include an electrode assembly, a housing 200 , a cap plate 300 , a terminal plate 400 , a bonding layer 500 , a rear surface insulating layer 600 , and a front surface insulating layer 700 .

[0168] The front surface 411 of the main board 410 of the terminal board 400 may be a second electrode terminal of the button battery 1006, and the rear surface 412 of the main board 410 contacts the protruding plate 420. The main board 410 is insulated from and bonded to the cover plate 300 through the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the penetration hole 310 of the cover plate 300, thereby inserting the bonding layer 500 therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover plate 300 through the bonding layer 500.

[0169] The outer side edge 413 of the main board 410 may have a reverse inclined shape, and the inner side edge 303 of the cover plate 300 may have a forward inclined shape. For example, the reverse inclined shape of the outer side edge 413 of the main board 410 and the forward inclined shape of the inner side edge 303 of the cover plate 300 may be in a longitudinal cross-sectional form, but the present disclosure is not limited thereto, and may be in a transverse cross-sectional form or a cross-sectional form according to an imaginary straight line or an imaginary surface.

[0170] Because the outer edge 413 of the main board 410 has a reversely inclined shape, the inner edge 303 of the cover plate 300 has a forwardly inclined shape, and the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 are bonded to each other through the bonding layer 500, it is possible to increase the bonding area between the bonding layer 500 and the main board 410 of the terminal plate 400 and the bonding area between the bonding layer 500 and the cover plate 300. Therefore, the bonding strength between the main board 410 and the cover plate 300 can be improved, and the impact resistance of the button battery 1006 can be improved.

[0171] The front surface 411 of the main board 410 is positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Because the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 are positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1006 can be formed to be thin.

[0172] The bonding layer 500 may be positioned between the main board 410 of the terminal board 400 and the cover plate 300 at a height that is the same or substantially the same as the height of the electrode assembly, the main board 410, and the cover plate 300. The bonding layer 500 is positioned between the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 forming the penetration hole 310, and the bonding layer 500 is bonded between the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. The bonding layer 500 may be positioned inside the penetration hole 310 of the cover plate 300. For example, the bonding layer 500 may be completely positioned inside the penetration hole 310 of the cover plate 300. The bonding layer 500 has an annular shape in a plan view, but the present disclosure is not limited thereto. For example, the bonding layer 500 may have a cross-sectional form corresponding to at least one cross-sectional form among the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. As another example, the bonding layer 500 may have a planar shape corresponding to at least one of the inner edge 303 of the cover plate 300 and the outer edge 413 of the main plate 410 .

[0173] The front surface insulating layer 700 is positioned on the front surface 411 of the main board 410, and may correspond to (e.g., overlap) the rear surface insulating layer 600. The front surface insulating layer 700 extends from the front surface 411 of the main board 410 to the front surface 301 of the cover plate 300 via the front surface of the bonding layer 500, and may correspond to the rear surface insulating layer 600. The front surface insulating layer 700 may include one layer or a plurality of layers. Since the front surface insulating layer 700 extends from a portion of the front surface 411 of the main board 410 to the front surface of the cover plate 300, the main board 410 and the cover plate 300 may be prevented from short-circuiting each other.

[0174] According to one or more embodiments, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (eg, middle or top), and thus, the thickness of the button battery 1006 may be formed to be thinner.

[0175] According to one or more embodiments, because the main board 410 of the terminal plate 400 includes a material different from the material of the protruding plate 420, the main board 410 may include a material having greater strength than the material of the protruding plate 420, and the protruding plate 420 may include a material that is the same as the material of the second electrode tab 150 of the electrode assembly, thereby facilitating the bonding between the electrode assembly and the terminal plate 400 and improving the impact resistance of the button battery 1006.

[0176] According to one or more embodiments, because the first thickness T1 of the protruding plate 420 can be thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly to the terminal plate 400 can be minimized or reduced, and therefore, the thickness of the button battery 1006 can be formed to be thinner.

[0177] According to one or more embodiments, because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at the same height as the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to external impact, and thus, the impact resistance of the button battery 1006 can be improved.

[0178] According to one or more embodiments, since the bonding area between the cap plate 300 and the main board 410 of the terminal plate 400 can be increased, the bonding strength between the main board 410 and the cap plate 300 can be improved, and the impact resistance of the button battery 1006 can be improved.

[0179] For example, a button cell 1006 having a reduced thickness, facilitating bonding between the electrode assembly and the terminal plate 400, and improving impact resistance may be provided.

[0180] In the following, reference will be made to Fig.13 A button cell according to another embodiment is described.

[0181] In the following, reference may be described in more detail Fig.13 Differences between the button battery and the button battery according to one or more embodiments described above are described in more detail, and a redundant description may not be repeated.

[0182] Fig.13 is a cross-sectional view showing a portion of a button battery according to another embodiment.

[0183] Reference Fig.13 According to another embodiment, a button cell 1007 may include an electrode assembly, a housing 200 , a cap plate 300 , a terminal plate 400 , a bonding layer 500 , a rear surface insulating layer 600 , and a front surface insulating layer 700 .

[0184] The front surface 411 of the main board 410 of the terminal board 400 may be a second electrode terminal of the button battery 1007, and the rear surface 412 of the main board 410 contacts the protruding plate 420. The main board 410 is insulated from and bonded to the cover plate 300 through the bonding layer 500. The outer edge 413 of the main board 410 faces the inner edge 303 of the penetration hole 310 of the cover plate 300, thereby inserting the bonding layer 500 therebetween. The outer edge 413 of the main board 410 is bonded to the inner edge 303 of the cover plate 300 through the bonding layer 500.

[0185] The outer edge 413 of the main board 410 may have protrusions and depressions, and the inner edge 303 of the cover plate 300 may have protrusions and depressions. For example, the protrusions and depressions of the outer edge 413 of the main board 410 and the protrusions and depressions of the inner edge 303 of the cover plate 300 may be in a longitudinal section form, but the present disclosure is not limited thereto, and may be in a transverse section form or a section form according to an imaginary straight line or an imaginary surface.

[0186] Because the outer edge 413 of the main board 410 has protrusions and depressions, the inner edge 303 of the cover plate 300 has protrusions and depressions, and the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 are bonded to each other through the bonding layer 500, it is possible to increase the bonding area between the bonding layer 500 and the main board 410 of the terminal plate 400 and the bonding area between the bonding layer 500 and the cover plate 300. Therefore, the bonding strength between the main board 410 and the cover plate 300 can be improved, and the impact resistance of the button battery 1007 can be improved.

[0187] The front surface 411 of the main board 410 is positioned at the same plane FP as the plane of the front surface 301 of the cover plate 300 (e.g., in the middle or on top). For example, the front surface of the main board 410, the front surface 301 of the cover plate 300, and the front surface of the bonding layer 500 may be positioned at the same plane FP as each other (e.g., in the middle or on top). Because the front surface 411 of the main board 410 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (e.g., in the middle or on top), the thickness of the button battery 1007 may be formed to be thinner.

[0188] The bonding layer 500 may be positioned between the main board 410 of the terminal board 400 and the cover plate 300 at a height that is the same or substantially the same as the height of the electrode assembly, the main board 410, and the cover plate 300. The bonding layer 500 is positioned between the outer edge 413 of the main board 410 and the inner edge 303 of the cover plate 300 forming the penetration hole 310, and the bonding layer 500 is bonded between the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. The bonding layer 500 may be positioned inside the penetration hole 310 of the cover plate 300. For example, the bonding layer 500 may be completely positioned inside the penetration hole 310 of the cover plate 300. The bonding layer 500 has an annular shape in a plan view, but the present disclosure is not limited thereto. For example, the bonding layer 500 may have a cross-sectional form corresponding to at least one cross-sectional form among the inner edge 303 of the cover plate 300 and the outer edge 413 of the main board 410. As another example, the bonding layer 500 may have a planar shape corresponding to at least one of the inner edge 303 of the cover plate 300 and the outer edge 413 of the main plate 410 .

[0189] The front surface insulating layer 700 is positioned on the front surface 411 of the main board 410, and may correspond to (e.g., overlap) the rear surface insulating layer 600. The front surface insulating layer 700 extends from the front surface 411 of the main board 410 to the front surface of the cover plate 300 via the front surface of the bonding layer 500, and may correspond to the rear surface insulating layer 600. The front surface insulating layer 700 may include one layer or a plurality of layers. Since the front surface insulating layer 700 extends from a portion of the front surface 411 of the main board 410 to the front surface of the cover plate 300, the main board 410 and the cover plate 300 may be prevented from short-circuiting each other.

[0190] According to one or more embodiments, the front surface 411 of the main board 410 of the terminal plate 400 and the front surface 301 of the cover plate 300 may be positioned at the same plane FP as each other (eg, middle or top), and thus, the thickness of the button battery 1007 may be formed to be thinner.

[0191] According to one or more embodiments, because the main board 410 of the terminal plate 400 includes a material different from the material of the protruding plate 420, the main board 410 may include a material having greater strength than the material of the protruding plate 420, and the protruding plate 420 may include the same material as the second electrode tab 150 of the electrode assembly, thereby promoting the bonding between the electrode assembly and the terminal plate 400, and improving the impact resistance of the button battery 1007.

[0192] According to one or more embodiments, because the first thickness T1 of the protruding plate 420 can be thinner than the second thickness T2 of the main board 410, the third thickness T3 of the cover plate 300, and the thickness of the bonding layer 500, the distance from the electrode assembly to the terminal plate 400 can be minimized or reduced, and therefore, the thickness of the button battery 1007 can be formed to be thinner.

[0193] According to one or more embodiments, because the bonding layer 500 includes a polypropylene resin or the like having elasticity compared to ceramic or fragile glass, and the cover plate 300 and the main board 410 are bonded to each other at a height that is the same as or substantially the same as the heights of the main board 410 and the cover plate 300, the bonding layer 500 can be suppressed from being separated from between the main board 410 and the cover plate 300 due to external impact, and thus, the impact resistance of the button battery 1007 can be improved.

[0194] According to one or more embodiments, since the bonding area between the cap plate 300 and the main board 410 of the terminal plate 400 can be increased, the bonding strength between the main board 410 and the cap plate 300 can be improved, and the impact resistance of the button battery 1007 can be improved.

[0195] For example, a button cell 1007 having a reduced thickness, facilitating bonding between the electrode assembly and the terminal plate 400, and improving impact resistance may be provided.

[0196] The foregoing is an explanation of some embodiments of the present disclosure and should not be construed as limiting them. Although some embodiments have been described, it will be readily understood by those skilled in the art that various modifications are possible in the embodiments without departing from the scope of the present disclosure. It will be understood that, unless otherwise described, the description of the features or aspects within each embodiment should generally be considered to be applicable to other similar features or aspects in other embodiments. Therefore, as will be apparent to those of ordinary skill in the art, unless otherwise specifically noted, the features, characteristics and / or elements described in conjunction with a particular embodiment may be used alone or in combination with the features, characteristics and / or elements described in conjunction with other embodiments. Therefore, it will be understood that the foregoing is an explanation of various example embodiments and should not be construed as being limited to the specific embodiments disclosed herein, and various modifications to the disclosed embodiments and other example embodiments are intended to be included within the scope of the present disclosure as defined in the appended claims and their equivalents.

[0197] Description of Reference Numerals 100: Electrode assembly 200: Shell 300: Cover 400: Terminal board 410: Motherboard 420: protruding plate 500: Bonding layer 600: Rear surface insulation layer.

Claims

1. A button battery, comprising: an electrode assembly comprising a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a housing connected to the first electrode, accommodating the electrode assembly, and having an opening exposing the electrode assembly; a cover plate coupled to the housing to cover an outer boundary area of ​​the opening and having a penetration hole exposing a central area of ​​the opening; a terminal plate connected to the second electrode, insulated from and bonded to the cap plate, and including a protruding plate protruding from a rear surface of a main plate in a direction toward the electrode assembly, the main plate covering the penetration hole; as well as A bonding layer is provided between the cover plate and the main plate, and insulates and bonds the cover plate and the main plate. Wherein, the front surface of the main board and the front surface of the cover board are located on the same plane with each other.

2. The button battery according to claim 1, wherein: The electrode assembly further comprises: a first electrode tab extending from the first electrode and welded to the housing; and A second electrode tab extends from the second electrode and is welded to the protruding plate of the terminal plate.

3. The button battery according to claim 2, wherein: The projection plate includes the same material as that of the second electrode tab.

4. The button battery according to claim 3, wherein: The projection plate comprises aluminum.

5. The button battery according to claim 3, wherein: The main plate includes a material different from that of the projection plate.

6. The button cell according to claim 5, wherein: The main plate includes the same material as that of the cover plate.

7. The button cell according to claim 6, wherein: The main board includes stainless steel.

8. The button battery according to claim 3, wherein: The main plate includes the same material as that of the projection plate.

9. The button cell according to claim 8, wherein: The main board is integrated with the protruding board.

10. The button cell according to claim 9, wherein: The main plate includes a material different from that of the cover plate.

11. The button cell according to claim 10, wherein: The main board includes aluminum.

12. The button cell according to claim 1, wherein: The bonding layer is located at the same height from the electrode assembly as the main plate and the cover plate.

13. The button cell according to claim 12, wherein: The bonding layer is located inside the penetration hole of the cover plate.

14. The button cell according to claim 12, wherein: The bonding layer is located between the outer edge of the main board and the inner edge of the cover board defining the penetration hole.

15. The button cell according to claim 14, wherein: The outer side edge of the main board has a positive step shape; and The inner edge of the cover plate has a reverse stepped shape.

16. The button cell according to claim 14, wherein: The outer side edge of the main board has a reverse stepped shape; and The inner edge of the cover plate has a positive step shape.

17. The button cell according to claim 14, wherein: The outer edge of the main board has a positively inclined shape; and The inner edge of the cover plate has a reversely inclined shape.

18. The button cell according to claim 14, wherein: The outer side edge of the main board has a reversely inclined shape; and The inner edge of the cover plate has a positively inclined shape.

19. The button cell according to claim 14, wherein: The outer edge of the main board has protrusions and depressions; and The inner edge of the cover plate has a convexity and a concaveity.

20. The button cell according to claim 12, wherein: The bonding layer has a planar annular shape.

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