Secondary battery and method of manufacturing the same

Abstract

The present disclosure relates to a secondary battery and a method of manufacturing the same. The secondary battery includes: an electrode assembly including an electrode stack formed by alternately stacking a first electrode, a separator, and a second electrode each having a circular shape, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode; an accommodating tank having one open side for accommodating the electrode assembly, the accommodating tank being electrically connected to the first electrode tab; a cap assembly configured to seal the one open side of the accommodation can, the cap assembly being electrically connected to the second electrode tab; a first contact member between one surface of the electrode laminate and the first electrode tab, the one surface of the electrode laminate facing a bottom surface of the accommodation can; and a first fixing member surrounding the first electrode tab between an inner side wall of the accommodating tank and an outer peripheral surface of the electrode assembly.

Description

Technical Field

[0001] This disclosure relates to a secondary battery and a method for manufacturing the secondary battery. Background Technology

[0002] Recently, the growing demand for wearable devices, such as Bluetooth-enabled headphones, in-ear headphones, smartwatches, and wearable medical devices, has increased the need for ultra-miniature secondary batteries with high energy density and sufficiently small size. Depending on the nature of the application, the height of such secondary batteries is significantly smaller than their width, and they can be referred to as coin cells or button cells.

[0003] A secondary battery includes an electrode assembly containing a positive electrode and a negative electrode, a housing for containing the electrode assembly, and electrode terminals connected to the electrode assembly. The electrode assembly can be wound or stacked to be housed in the housing.

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

[0005] An embodiment includes a secondary battery comprising: an electrode assembly including an electrode stack formed by alternately stacking a first electrode, a separator, and a second electrode, each having a circular shape; a first electrode terminal connected to the first electrode; and a second electrode terminal connected to the second electrode; a receiving container having an open side for receiving the electrode assembly, the receiving container being electrically connected to the first electrode terminal; a cover assembly configured to seal the open side of the receiving container, the cover assembly being electrically connected to the second electrode terminal; a first contact member between a surface of the electrode stack and the first electrode terminal, the one surface of the electrode stack facing the bottom surface of the receiving container; and a first fixing member surrounding the first electrode terminal between an inner wall of the receiving container and an outer peripheral surface of the electrode assembly.

[0006] The first fixing member may include: a first surface that contacts the first electrode tab; and a second surface that contacts the receiving container, wherein the width of the first surface may be greater than the width of the second surface along the circumference of the electrode assembly.

[0007] The cross-section of the first fixing member perpendicular to the stacking direction of the electrode stack can have an arc shape.

[0008] The cross-section of the first fixing member perpendicular to the stacking direction of the electrode stack can have a trapezoidal shape.

[0009] The cross section of the first fixing member perpendicular to the stacking direction of the electrode stack can have a stepped shape between the first surface and the second surface.

[0010] The first fixing member can be bonded to the first electrode tab by an adhesive coated on the first surface.

[0011] The secondary battery may further include a second fixing member surrounding the second electrode tab between the inner wall of the receiving container and the outer peripheral surface of the electrode assembly.

[0012] The second fixing member may include: a first surface that contacts the second electrode tab; and a second surface that contacts the receiving container, wherein the width of the first surface may be greater than the width of the second surface along the circumference of the electrode assembly.

[0013] The cross-section of the second fixing member perpendicular to the stacking direction of the electrode stack can have an arc shape.

[0014] The cross-section of the second fixing member perpendicular to the stacking direction of the electrode stack can have a trapezoidal shape.

[0015] The cross section of the second fixing member perpendicular to the stacking direction of the electrode stack can have a stepped shape between the first surface and the second surface.

[0016] At least one of the first fixing member and the second fixing member may include an insulating material, said insulating material including at least one of polypropylene, polyimide and polyethylene terephthalate.

[0017] At least one of the first fixing member and the second fixing member may include a porous insulating material.

[0018] The first electrode may include: a first coated portion on the outer periphery of a circular first substrate, inside a predetermined first chord, the first coated portion being coated with a first active material; and a first uncoated portion on the outer periphery of the predetermined first chord, not coated with the first active material, and wherein the second electrode includes: a second coated portion on the outer periphery of a circular second substrate, inside a predetermined second chord, the second coated portion being coated with a second active material; and a second uncoated portion on the outer periphery of the predetermined second chord, not coated with the second active material.

[0019] The first electrode tab can be adhered to the bottom surface of the container by pressure from the electrode stack in response to the cap assembly being connected to the container.

[0020] The secondary battery may further include a second contact member between the other surface of the electrode stack facing the second electrode terminal and the bottom surface of the cover assembly.

[0021] The second electrode tab can be attached to the bottom surface of the cover assembly by pressure from the electrode stack in response to the cap assembly being connected to the container.

[0022] The cover assembly may include: a terminal plate connected to the second electrode tab; a cover plate including a first opening, the cover plate being coupled to the open side of the receiving container; and a cover insulation layer including a second opening, the cover insulation layer being between the terminal plate and the cover plate for insulation.

[0023] The terminal block may include: a body connected to the second electrode tab; and a protrusion extending upward from the center of the body, the protrusion passing through the first opening and the second opening, wherein the diameter of the body may be larger than the diameter of the outer peripheral surface of the electrode stack.

[0024] The embodiment includes a method of manufacturing a secondary battery, the method comprising: forming an electrode assembly including an electrode stack formed by alternately stacking a first electrode, a separator, and a second electrode, each having a circular shape; a first electrode tab connected to the first electrode; and a second electrode tab connected to the second electrode; arranging a first contact member on the electrode stack; bending the first electrode tab and placing the first electrode tab on the first contact member; arranging a first fixing member on an outer peripheral surface of the electrode assembly to surround the first electrode tab; receiving the electrode assembly in a receiving container having an open side; and connecting the first electrode tab to the receiving container by attaching a cover assembly to the open side of the receiving container.

[0025] This disclosure aims to provide a secondary battery capable of preventing the electrode assembly from moving within a housing, and a method for manufacturing the secondary battery. However, the technical problems to be solved by this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the following description of this disclosure other problems not mentioned herein, as well as aspects and features of this disclosure that will solve these problems.

[0026] According to embodiments of this disclosure, in order to solve the above-mentioned technical problems, a secondary battery may include: an electrode assembly comprising an electrode stack formed by alternately stacking a first electrode, a separator, and a second electrode, each of which is circular; a first electrode terminal connected to the first electrode; and a second electrode terminal connected to the second electrode; a receiving container having an open side for receiving the electrode assembly and electrically connected to the first electrode terminal; a cover assembly configured to seal the open side of the receiving container and electrically connected to the second electrode terminal; a first contact member disposed between a surface of the electrode stack and the first electrode terminal, the surface of the electrode stack facing the bottom surface of the receiving container; and a first fixing member disposed around the first electrode terminal between the inner wall of the receiving container and the outer peripheral surface of the electrode assembly.

[0027] According to one or more embodiments, the first fixing member may include: a first surface that contacts the first electrode tab; and a second surface that contacts the receiving container. Along the circumferential direction of the electrode assembly, the width of the first surface may be greater than the width of the second surface.

[0028] According to one or more embodiments, the cross-section of the first fixing member perpendicular to the stacking direction of the electrode stack may have an arc shape.

[0029] According to one or more embodiments, the cross section of the first fixing member perpendicular to the stacking direction of the electrode stack may have a trapezoidal shape.

[0030] According to one or more embodiments, the cross section of the first fixing member perpendicular to the stacking direction of the electrode stack may have a stepped shape between the first surface and the second surface.

[0031] According to one or more embodiments, the first fixing member can be bonded to the first electrode tab by an adhesive coated on the first surface.

[0032] According to one or more embodiments, the secondary battery may further include a second fixing member positioned around the second electrode tab between the inner wall of the receiving container and the outer peripheral surface of the electrode assembly.

[0033] According to one or more embodiments, the second fixing member may include: a first surface that contacts the second electrode tab; and a second surface that contacts the receiving container. Along the circumferential direction of the electrode assembly, the width of the first surface may be greater than the width of the second surface.

[0034] According to one or more embodiments, the cross-section of the second fixing member perpendicular to the stacking direction of the electrode stack may have an arc shape.

[0035] According to one or more embodiments, the cross section of the second fixing member perpendicular to the stacking direction of the electrode stack may have a trapezoidal shape.

[0036] According to one or more embodiments, the cross section of the second fixing member perpendicular to the stacking direction of the electrode stack may have a stepped shape between the first surface and the second surface.

[0037] According to one or more embodiments, at least one of the first fixing member and the second fixing member may include an insulating material, said insulating material including at least one of polypropylene (PP), polyimide (PI) or polyethylene terephthalate (PET).

[0038] According to one or more embodiments, at least one of the first fixing member and the second fixing member may include a porous insulating material.

[0039] According to one or more embodiments, the first electrode may include a first coated portion disposed on the inner side of a predetermined first chord on the outer periphery of a circular first substrate and coated with a first active material, and a first uncoated portion disposed on the outer side of the predetermined first chord and not coated with the first active material. The second electrode may include a second coated portion disposed on the inner side of a predetermined second chord on the outer periphery of a circular second substrate and coated with a second active material, and a second uncoated portion disposed on the outer side of the predetermined second chord and not coated with the second active material.

[0040] According to one or more embodiments, the first electrode tab can be tightly attached to the bottom surface of the container by pressure transmitted by the electrode stack in response to the cap assembly being coupled to the container.

[0041] According to one or more embodiments, the secondary battery may further include a second contact member disposed between another surface of the electrode stack and the second electrode tab, the other surface of the electrode stack facing the bottom surface of the cover assembly.

[0042] According to one or more embodiments, the second electrode tab can be tightly attached to the bottom surface of the cover assembly by pressure transmitted by the electrode stack in response to the cap assembly being coupled to the container.

[0043] According to one or more embodiments, the cover assembly may include: a terminal plate connected to the second electrode tab; a cover plate including a first opening and coupled to the open side of the receiving container; and a cover insulation layer including a second opening and disposed between the terminal plate and the cover plate for insulation.

[0044] According to one or more embodiments, the terminal block may include: a body connected to the second electrode tab; and a protrusion projecting upward from the center of the body and passing through the first opening and the second opening. The diameter of the body may be larger than the diameter of the outer peripheral surface of the electrode stack.

[0045] According to one or more embodiments of this disclosure, a method of manufacturing a secondary battery (i.e., a method of manufacturing a secondary battery) may include: forming an electrode assembly comprising an electrode stack formed by alternately stacking a first electrode, a separator, and a second electrode, each of which is circular; a first electrode tab connected to the first electrode; and a second electrode tab connected to the second electrode; arranging a first contact member on the electrode stack; bending the first electrode tab and placing the first electrode tab on the first contact member; arranging a first fixing member on the outer peripheral surface of the electrode assembly to surround the first electrode tab; housing the electrode assembly in a receiving container having an open side; and connecting the first electrode tab to the receiving container by attaching a cover assembly to the open side of the receiving container.

[0046] However, the aspects and features of this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the detailed description below that other aspects and features not mentioned are also included. Attached Figure Description

[0047] The following accompanying drawings illustrate embodiments of the present disclosure and, together with the detailed description of the present disclosure, further describe aspects and features of the present disclosure. Therefore, the present disclosure should not be construed as limited to the drawings.

[0048] Features will become apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0049] Figure 1 This is a perspective view illustrating a secondary battery according to an embodiment of the present disclosure;

[0050] Figure 2 This is an exploded view illustrating a secondary battery according to an embodiment;

[0051] Figure 3 This is an example Figure 1 A view of the section taken along line AA;

[0052] Figure 4 This is a view, taken from above, illustrating an electrode assembly housed in a container as a comparative example.

[0053] Figure 5 This is a top view illustrating an electrode assembly housed in a receiving container according to an embodiment of the present disclosure;

[0054] Figures 6 to 9 This is a view illustrating a first fixing member according to various embodiments of the present disclosure;

[0055] Figure 10 This is a view illustrating an example of an electrode assembly according to an embodiment of the present disclosure;

[0056] Figure 11 This is an example of viewing from above. Figure 10 An exploded view of a portion of the electrode assembly in region B;

[0057] Figure 12 This is a view illustrating an example of a first electrode and a second electrode according to an embodiment of the present disclosure;

[0058] Figure 13 This is a view illustrating the placement of the first contact member, the second contact member, the first fixing member, and the second fixing member on the electrode assembly;

[0059] Figure 14 This is a cross-sectional view illustrating a terminal block according to an embodiment of the present disclosure;

[0060] Figure 15 This is an exploded perspective view illustrating a cover assembly according to an embodiment of the present disclosure;

[0061] Figure 16 This is a view illustrating the connection relationship between the cover assembly and the electrode assembly;

[0062] Figure 17 This is a view illustrating the connection relationship between the electrode assembly and the receiving tank according to an embodiment of the present disclosure; and

[0063] Figure 18 This is a flowchart illustrating a method for manufacturing a secondary battery according to embodiments of the present disclosure.

[0064] [Explanation of reference numerals in the attached figures]

[0065] 1: Secondary battery

[0066] 100: Electrode assembly

[0067] 110: First electrode

[0068] 113: First electrode connector

[0069] 120: Second electrode

[0070] 123: Second electrode connector

[0071] 124: Insulation layer

[0072] 130: Diaphragm

[0073] 140: Electrode laminate

[0074] 210: First contact component

[0075] 220: Second contact component

[0076] 230: First fixed component

[0077] 240: Second fixed component

[0078] 300: Reservoir

[0079] 400: Cover assembly

[0080] 410: Terminal block

[0081] 420: Cover plate

[0082] 430: Cover with insulation layer Detailed Implementation

[0083] In the following description, exemplary embodiments will be described more fully with reference to the accompanying drawings; however, they may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary implementation methods to those skilled in the art.

[0084] In the drawings, the dimensions of layers and regions may be exaggerated for clarity of illustration. It will also be understood that when a layer or element is referred to as "on" another layer or substrate, it may be directly on the other layer or substrate, or an intervening layer may also be present. Furthermore, it will be understood that when a layer is referred to as "below" another layer, it may be directly below the other layer, or one or more intervening layers may also be present. Additionally, it will be understood that when a layer is referred to as "between" two layers, it may be the only layer between the two layers, or one or more intervening layers may also be present. The same reference numerals always indicate the same elements.

[0085] Embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as having a general or dictionary meaning, but should be interpreted in a way consistent with the technical concept of this disclosure, based on the principle that the inventor is capable of being his / her own lexicographer to appropriately define the concepts of the terms and to best describe his / her invention.

[0086] The embodiments described in this specification and the configurations shown in the accompanying drawings are only some of the embodiments of this disclosure and do not represent all the technical spirit, aspects, and features of this disclosure. Accordingly, it should be understood that various equivalents and modifications that can replace or modify the embodiments described herein may exist at the time of filing this application.

[0087] It will be understood that when an element or layer is referred to as being "on" another element or layer, "connected to," or "linked to" another element or layer, it can be directly on, directly connected to, or linked to the other element or layer, or one or more intermediary elements or layers may be present. When an element or layer is referred to as being "directly on" another element or layer, "directly connected to," or "directly linked to" another element or layer, no intermediary element or layer is present. For example, when a first element is described as being "linked" or "connected" to a second element, the first element can be directly linked to or connected to the second element, or the first element can be indirectly linked to or connected to the second element via one or more intermediary elements.

[0088] In the figures, the dimensions of various elements, layers, etc., may be exaggerated for clarity of illustration. The same reference numerals denote the same elements. As used herein, the term “and / or” includes any and all combinations of one or more of the related listed items. Furthermore, when describing embodiments of this disclosure, the use of “may” refers to “one or more embodiments of this disclosure.” Expressions such as “at least one of…” and “any one of…” modify the entire list of elements when following it, and not individual elements within that list. When phrases such as “at least one of A, B, and C,” “at least one of A, B, or C,” “at least one selected from the group of A, B, and C,” or “at least one selected from A, B, and C” are used to refer to a list of elements A, B, and C, the phrase may refer to any one of A, B, and C and all suitable combinations or subsets of them, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the term “use” may be considered synonymous with the term “utilize.” As used herein, the terms “basically,” “about,” and similar terms are used as approximate terms and not as terms of degree, and are intended to describe the inherent variations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art.

[0089] It will be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, areas, layers, and / or segments, these elements, components, areas, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, area, layer, or segment from another element, component, area, layer, or segment. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, area, layer, or segment discussed below may be referred to as the second element, component, area, layer, or segment.

[0090] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” are used herein to describe the relationship between one element or feature illustrated in the figure and another element or feature. It will be understood that spatial relative terms are intended to cover different orientations of the device in use or operation other than the orientation depicted in the figure. For example, if the device in the figure is flipped, an element described as “below” or “under” other elements or features would then be oriented as “above” or “above” other elements or features. Therefore, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein should be interpreted accordingly.

[0091] The terminology used herein is for the purpose of describing embodiments of this disclosure and is not intended to limit this disclosure. As used herein, the singular form “a” is intended to include the plural form as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprising” and / or “including” as used in this specification specify the presence of stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0092] Furthermore, any numerical range disclosed and / or described herein is intended to include all subranges with the same numerical precision contained within the described range. For example, the range “1.0 to 10.0” is intended to include all subranges between the described minimum value of 1.0 and the described maximum value of 10.0 (and inclusive of both), i.e., a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit described herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit described herein is intended to include all higher numerical limits contained therein. Accordingly, the applicant reserves the right to amend this specification, including the claims, to explicitly describe any subranges contained within the scope explicitly described herein.

[0093] Referring to two compared elements, features, etc., as “identical” can mean that they are “substantially identical.” Therefore, the phrase “substantially identical” can include cases where the deviation is considered low in the art (e.g., 5% or less). Additionally, when a parameter is said to be consistent in a given region, it can mean that it is consistent in terms of the mean.

[0094] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0095] Placing any element "above (or below)" or "on (below)" another element can mean that the arbitrary element can be configured to contact the upper (or lower) surface of the element, and that the other element can be located between the element and the arbitrary element disposed on (or below) the element.

[0096] Additionally, it will be understood that when a component is referred to as “connected,” “linked,” or “attached” to another component, these components can be directly “connected,” “linked,” or “attached” to each other, or another component can be “between” these components.

[0097] Throughout this specification, unless otherwise stated, the phrase "A and / or B" means A, B, or A and B. That is, "and / or" includes any one or all of the listed items. Unless otherwise stated, the phrase "C to D" means C and below D.

[0098] Figure 1 This is a perspective view illustrating a secondary battery according to an embodiment of the present disclosure. Figure 2 This is an exploded view illustrating a secondary battery according to an embodiment, and Figure 3 This is an example Figure 1 A view of the section taken along line AA.

[0099] refer to Figures 1 to 3 According to embodiments of the present disclosure, the secondary battery 1 may include an electrode assembly 100, a first contact member 210, a second contact member 220, a first fixing member 230, a second fixing member 240, a container 300, and a cover assembly 400.

[0100] The secondary battery 1 according to one or more embodiments is a micro secondary battery, and may be a coin cell battery or a button cell battery, but is not limited thereto, and may be a cylindrical or needle-shaped battery.

[0101] A coin cell or button cell is a battery in the form of a thin coin or button, and may refer to, but is not limited to, a battery having a height-to-diameter ratio (height / diameter) of 1 or less. Because coin cells or button cells are generally cylindrical, their horizontal cross-section is generally circular. However, the horizontal cross-section is not limited to this and may have an elliptical or polygonal shape. The diameter may refer to the maximum horizontal distance of the battery, and the height may refer to the maximum vertical distance of the battery (e.g., the distance from the flat bottom surface to the flat top surface of the battery).

[0102] According to an embodiment, the electrode assembly 100 may include an electrode stack 140 formed by stacking a first electrode 110, a diaphragm 130, and a second electrode 120 in a circular shape, a first electrode tab 113 connected to the first electrode 110, and a second electrode tab 123 connected to the second electrode 120. The electrode stack 140 may have a stacked structure formed by alternately stacking a plurality of first electrodes 110, a plurality of diaphragms 130, and a plurality of second electrodes 120. The first electrode 110 may be a negative electrode, and the second electrode 120 may be a positive electrode. Alternatively, the first electrode 110 may be a positive electrode, and the second electrode 120 may be a negative electrode.

[0103] The first electrode 110 may include a first coating portion 111 on both surfaces of a first substrate formed of a circular thin metal plate, wherein a first active material is coated (see reference). Figure 12 ) and the first uncoated portion 112 that exposes the first substrate and has no first active material (see reference) Figure 12 The first coated portion 111 can be formed by coating a first active material, such as graphite or carbon, onto a circular current collector plate formed of a metal foil, such as copper, a copper alloy, nickel, or a nickel alloy. A first uncoated portion 112 without the first active material can be connected to a separately formed first electrode terminal piece 113, or a portion of the first uncoated portion 112 can be stamped to form the first electrode terminal piece 113. The first electrode 110 or the first electrode terminal piece 113 can be connected to a receiving container 300. The receiving container 300 connected to the first electrode 110 can be used as a negative electrode.

[0104] The second electrode 120 may include a second coating portion 121 on which a second active material is coated on both surfaces of a second substrate formed of a circular thin metal plate (see reference). Figure 12 ) and a second uncoated portion 122 that exposes the second substrate and has no second active material (see reference) Figure 12The second coated portion 121 can be formed by applying a second active material, such as a transition metal oxide, to a current collector plate formed of a metal foil such as aluminum or an aluminum alloy. A second uncoated portion 122 without the second active material can be connected to a separately formed second electrode tab 123, or a portion of the second uncoated portion 122 can be stamped to form the second electrode tab 123. The second electrode 120 can be connected to a cover assembly 400. The cover assembly 400 connected to the second electrode 120 can serve as a positive electrode.

[0105] A separator 130 may be disposed between the first electrode 110 and the second electrode 120. The separator 130 can insulate the first electrode 110 and the second electrode 120, and lithium ions can be exchanged between the first electrode 110 and the second electrode. The separator 130 may have sufficient length to completely insulate the first electrode 110 and the second electrode 120 even if the electrode assembly 100 contracts or expands during the charging and discharging process of the secondary battery 1.

[0106] The first electrode tab 113 can be connected to the first electrode 110. The first electrode tab 113 can be connected to the first uncoated portion 112 of the first electrode 110, or it can be formed by stamping the first uncoated portion 112. The first electrode tab 113 can be made of the same material as the metal substrate (i.e., the first substrate) of the first electrode 110. Multiple first electrode tabs 113 connected to corresponding first uncoated portions 112 can be formed in the same direction and positioned facing each other. Multiple first electrode tabs 113 can be connected to each other by welding. For example, multiple first electrode tabs 113 can be connected by welding and integrated into a single tab. As another example, multiple first electrode tabs 113 can be welded to a lead tab for bending and connection to the receiving container 300.

[0107] A first electrode tab 113 connected to the first electrode 110 can be electrically connected to the receiving container 300. The first electrode tab 113 can serve as a current path to the receiving container 300 connected to the first electrode 110. For example, the first electrode tab 113 can be first bent towards the bottom of the receiving container 300, and then bent a second time to be positioned between the lower surface of the electrode stack 140 and the bottom of the receiving container 300. The first electrode tab 113 can be positioned between the electrode stack 140 and one inner side of the receiving container 300. The first electrode tab 113 can be positioned between the lower surface of the electrode stack 140 and the inner bottom surface of the receiving container 300 to be tightly connected to the receiving container 300 by pressure from the electrode stack 40. In this case, without a separate bonding process such as welding, the first electrode tab 113 can be electrically connected to the inner bottom surface of the receiving container 300 by pressure from the electrode stack 140.

[0108] The first contact member 210 can be placed between the first electrode tab 113 and the lower surface of the electrode stack 140. The first electrode tab 113 can be disposed on the lower surface of the first contact member 210. The first electrode tab 113 can be disposed on the lower surface of the first contact member 210 and is tightly connected to the receiving container 130 by the pressure applied by the first contact member 210. Without a separate bonding process such as welding, the first electrode tab 113 can be electrically connected to the inner bottom surface of the receiving container 300 by the pressure applied by the first contact member 210.

[0109] The second electrode tab 123 can be connected to the second electrode 120. The second electrode tab 123 can be connected to the second uncoated portion 122 of the second electrode 120, or it can be formed by stamping the second uncoated portion 122. The second electrode tab 123 may be made of the same material as the metal substrate (i.e., the second substrate) of the second electrode 120. A plurality of second electrode tabs 123 connected to corresponding second uncoated portions 122 can be formed in the same direction and positioned facing each other. The plurality of second electrode tabs 123 can be connected to each other by welding. For example, the plurality of second electrode tabs 123 can be welded together and integrated into a single tab. As another example, the plurality of second electrode tabs 123 can be welded to a lead tab for bending and connection to the cover assembly 400.

[0110] The second electrode tab 123, connected to the second electrode 120, can be electrically connected to the cover assembly 400. The second electrode tab 123 can serve as a current path to the cover assembly 400 connected to the second electrode 120. For example, the second electrode tab 123 can be first bent toward an inner surface of the cover assembly 400, and then bent a second time to be positioned between the upper surface of the electrode stack 140 and an inner surface of the cover assembly 400. The second electrode tab 123 can be connected to the cover assembly 400. The second electrode tab 123 can be disposed on the upper surface of the second contact member 220. The second electrode tab 123 can be placed between the electrode stack 140 and an inner surface of the cover assembly 400. The second electrode tab 123 can be placed between the electrode stack 140 and an inner surface of the cover assembly 400, and is tightly connected to the cover assembly 400 by pressure from the electrode stack 40. In this case, without a separate bonding process such as welding, the second electrode tab 123 can be electrically connected to an inner surface of the cover assembly 400 by pressure from the electrode stack 140.

[0111] The second contact member 220 can be placed between the second electrode tab 123 and the upper surface of the electrode stack 140. In this case, the second electrode tab 123 can be placed on the upper surface of the second contact member 220. The second electrode tab 123 can be placed on the upper surface of the second contact member 220 and is tightly connected to the cover assembly 400 by pressure from the second contact member 220. Without a separate bonding process such as welding, the second electrode tab 123 can be electrically connected to an inner surface of the cover assembly 400 by pressure from the second contact member 220.

[0112] The secondary battery 1 may further include an insulating layer 124 disposed on a region of the second electrode 120 facing the first electrode 110 on one side of the second electrode 120. A separator 130 may be disposed between the first electrode 110 and the second electrode 120, but the area of ​​the first electrode 110 may be larger than the area of ​​the second electrode 120. Therefore, a short circuit may occur between the first electrode 110 and the second electrode 120. For example, a short circuit with the first electrode 110 may occur during bending of the second electrode tab 123, which extends from one side of the second electrode 120 and is connected to it. To prevent short circuits, the insulating layer 124 may be placed on a second uncoated portion 122 of the second electrode 120 connected to the second electrode tab 123.

[0113] The first contact member 210 may be disposed between the electrode stack 140 and the receiving container 300. The first contact member 210 may be positioned on the lower surface of the electrode stack 140 relative to the stacking orientation of the electrode stack 140. During the process of joining the receiving container 300 to the cover assembly 400, the first contact member 210 may be compressed by pressure from the electrode stack 140 to allow the first electrode tab 113 to be tightly attached to the receiving container 300.

[0114] The first contact member 210 may include an elastic insulator. The first contact member 210 may be an elastic body that is compressed by pressure from the electrode stack 140. The first contact member 210 may be an insulator that prevents short circuits that may occur between the receiving container 300 and other components of the electrode assembly 100 besides the first electrode 110. The first contact member 210 may include an elastic insulator such as rubber, silicone, or a polymer, but other materials are also possible.

[0115] The first contact member 210 may comprise a porous material with elasticity. The first contact member 210 may be a porous material that is compressed to tightly bond the first electrode tab 113 to the receiving container 300 while containing electrolyte. The first contact member 210 may be formed of a porous material with a sponge structure, honeycomb structure, or various types of pores, but other structures are also possible.

[0116] The second contact member 220 may be disposed between the electrode stack 140 and the cover assembly 400. The second contact member 220 may be disposed on the upper surface of the electrode stack 40 relative to the stacking direction of the electrode stack 140. When the receiving container 300 is engaged with the cover assembly 400, the second contact member 220 may be compressed by pressure from the electrode stack 140, thereby tightly attaching the second electrode terminal 123 to the cover assembly 400.

[0117] The second contact member 220 may include an elastic insulator. The second contact member 220 may be an elastic body that is compressed by pressure from the electrode stack 140. The second contact member 220 may be an insulator that prevents short circuits between the cover assembly 400 and other components of the electrode assembly 100 besides the second electrode 120. The second contact member 220 may include an elastic insulator such as rubber, silicone, or a polymer, but other materials are also possible.

[0118] The second contact member 220 may comprise a porous material with elasticity. The second contact member 220 may be a porous material that is compressed to tightly attach the second electrode tab 123 to the cover assembly 400 while containing an electrolyte. The second contact member 220 may be a porous material with a sponge structure, honeycomb structure, or various types of pores, but other structures are also possible.

[0119] The first fixing member 230 can be positioned between the inner wall of the receiving container 300 and the outer peripheral surface of the electrode assembly 100, surrounding the first electrode terminal 113. The first fixing member 230 can contact the first electrode terminal 113 and the receiving container 300.

[0120] The first fixing member 230 can be formed to correspond to the gap between the outer peripheral surface of the electrode assembly 100 where the first electrode contact piece 113 is placed and the inner wall of the receiving container 300. Along the circumference or periphery of the electrode assembly 100, the width of the first surface 231 of the first fixing member 230 that contacts the first electrode contact piece 113 can be greater than the width of the second surface 232 of the first fixing member 230 that contacts the receiving container 300 (for example, the area of ​​the second surface 232 that contacts the receiving container 300 can be smaller than the area of ​​the first surface 231 that covers the electrode contact piece 113). For the purpose of preventing contact between the receiving container 300 and other components of the electrode assembly 100 besides the first electrode contact piece 113, along the circumference or periphery of the electrode assembly 100, the width of the first surface 231 of the first fixing member 230 that contacts the first electrode contact piece 113 can be greater than the width of the first electrode contact piece 113. The first surface 231 of the first fixing member 230, which has a width greater than that of the first electrode tab 113, can be attached to the outer peripheral surface of the electrode assembly 100 around the first electrode tab 113.

[0121] The first retaining member 230 may be elastic and compressible after being attached to the outer peripheral surface of the electrode assembly 100. For example, the first retaining member 230 may be compressed and housed together with the electrode assembly 100 in a receiving container 300. The first retaining member 230, compressed and housed in the receiving container, may provide elasticity between the electrode assembly 100 and the receiving container 300 to prevent the electrode assembly 100 from moving within the receiving container 300.

[0122] The first fixing member 230 may be an insulator that prevents a short circuit between the outer peripheral surface of the electrode assembly 100 and the inner wall of the receiving container 300. The first fixing member 230 may include at least one of polypropylene (PP), polyimide (PI) and polyethylene terephthalate (PET) as insulating materials, but may be any material capable of insulating between the electrode assembly 100 and the receiving container 300 (e.g., any material).

[0123] The second fixing member 240 may be configured to surround the second electrode terminal 123 between the inner wall of the receiving tank 300 and the outer peripheral surface of the electrode assembly 100. The second fixing member 240 may contact the second electrode terminal 123 and the receiving tank 300.

[0124] The second fixing member 240 can be formed to correspond to the gap between the outer peripheral surface of the electrode assembly 100 where the second electrode contact piece 123 is placed and the inner wall of the receiving container 300. Along the circumference or periphery of the electrode assembly 100, the width of the first surface 241 of the second fixing member 240 contacting the second electrode contact piece 123 can be greater than the width of the second surface 242 of the second fixing member 240 contacting the receiving container 300. For the purpose of preventing contact between the receiving container 300 and other components of the electrode assembly 100 besides the second electrode contact piece 123, along the circumference or periphery of the electrode assembly 100, the width of the first surface 241 of the second fixing member 240 contacting the second electrode contact piece 123 can be greater than the width of the second electrode contact piece 123. The first surface 241 of the second fixing member 240 having a width greater than the width of the second electrode contact piece 123 can be attached to the outer peripheral surface of the electrode assembly 100 around the second electrode contact piece 123.

[0125] The second retaining member 240 may be elastic and compressible after being attached to the outer peripheral surface of the electrode assembly 100. For example, the second retaining member 240 may be compressed and housed together with the electrode assembly 100 in a receiving container 300. The compressed second retaining member 240 housed in the receiving container may provide elasticity between the electrode assembly 100 and the receiving container 300 to prevent the electrode assembly 100 from moving within the receiving container 300.

[0126] The second fixing member 240 may be an insulator that prevents a short circuit between the outer peripheral surface of the electrode assembly 100 and the inner wall of the receiving container 300. The second fixing member 240 may include at least one of polypropylene (PP), polyimide (PI) and polyethylene terephthalate (PET) as insulating materials, but may be any material capable of insulating between the electrode assembly 100 and the receiving container 300 (e.g., any material).

[0127] The container 300 may have one side open to accommodate the electrode assembly 100 and may be electrically connected to the first electrode 110. The container 300 may be connected to the first electrode 110 via the first electrode tab 113 to serve as a negative electrode.

[0128] The container 300 can form the overall appearance of the secondary battery 1. For example, the container 300 can have a cylindrical shape with an open side. The container 300 can include a circular bottom surface and side walls extending vertically from the circumference of the bottom surface. The diameter of the bottom surface of the container 300 can be greater than the height of the side walls, so that the secondary battery 1 can be formed into a button or coin shape.

[0129] The upper surface of the receiving container 300 may be open, exposing the receiving space for the electrode assembly 100. After the electrode assembly 100 is received in the receiving container 300, the cover assembly 400 may cover one open side of the receiving container 300 to seal the electrode assembly 100. Specifically, the upper surface of the sidewall of the receiving container 300 may be a step from the outside in. The cover assembly 400 may be joined and connected to the step of the receiving container 300 by a metallic bonding (e.g., welding, brazing, soldering, etc.), but this can be varied.

[0130] The cap assembly 400 can seal one open side of the receiving container 300. The cap assembly 400 can cover one open side of the receiving container 300 to seal the electrode assembly 100 from the outside. The cap assembly 400 can be electrically connected to the second electrode 120. The cap assembly 400 can be connected to the second electrode 120 via the second electrode connector 123 to serve as a positive electrode.

[0131] The cover assembly 400 may include a terminal block 410, a cover plate 420, and a cover insulation layer 430.

[0132] Terminal plate 410 can be connected to second electrode 120. Terminal plate 410 can be disposed on second contact member 220. Second electrode terminal piece 123 can be disposed between terminal plate 410 and second contact member 220. Terminal plate 410 can be electrically connected to second electrode 120 through second electrode terminal piece 123.

[0133] The insulating layer 430 and the cover plate 420 can be sequentially placed on the terminal block 410. The terminal block 410 may include a protrusion 412 (see reference) that protrudes upward from the central region. Figure 15 The protrusion 412 can protrude outward through the first opening of the cover plate 420 and the second opening of the cover insulation layer 430.

[0134] The cover plate 420 can be attached to an open side of the container 300. The cover plate 420 can be mounted on the outer wall of the container 300 to attach to the container 300. The cover plate 420 can be placed on the cover insulation layer 430.

[0135] The cover plate 420 may include a first opening. The cover plate 420 may be disc-shaped with the first opening at its center. The protrusion 412 of the terminal plate 410 may be connected to an external terminal through the first opening.

[0136] An insulating cover 430 can be placed on the terminal block 410. The insulating cover 430 can be disposed between the terminal block 410 and the cover plate 420 to provide insulation between the terminal block 410 and the cover plate 420. The terminal block 410 can be connected to the second electrode 120, and the cover plate 420 can contact the receiving container 300 connected to the first electrode 110, such that the insulating cover 430 can be disposed between the terminal block 410 and the cover plate 420 to provide insulation between the terminal block 410 and the cover plate 420.

[0137] The cover insulation layer 430 may include a second opening. The cover insulation layer 430 may have a disc shape with the second opening at its center. The protrusion 412 of the terminal block 410 may be connected to an external terminal through the second opening.

[0138] Figure 4 This is a view, taken from above, illustrating an electrode assembly housed in a container as a comparative example. Figure 5 This is a top view illustrating an electrode assembly housed in a housing according to an embodiment of the present disclosure. Figures 6 to 9 This is a view illustrating a first fixing member according to various embodiments of the present disclosure.

[0139] refer to Figure 4 As a comparative example, the electrode assembly 100 can be housed through an open side of the housing 300.

[0140] The electrode assembly 100 may include an electrode stack formed by alternately stacking a plurality of first electrodes, a plurality of diaphragms and a plurality of second electrodes, a first electrode terminal 113a connected to one side of each of the plurality of first electrodes and a second electrode terminal 123a connected to one side of each of the plurality of second electrodes.

[0141] The first electrode tab 113a and the second electrode tab 123a can be formed from thin metal plates and bent with a predetermined gap from the outer peripheral surface of the electrode assembly 100 (or the outer peripheral surface of the electrode laminate). For example, the first electrode tab 113a can be bent first toward the bottom surface of the receiving container 300 opposite to one open side with a predetermined gap from the outer peripheral surface of the electrode assembly 100, and then bent a second time to be disposed on one surface of the electrode laminate facing the bottom surface of the receiving container 300. The second electrode tab 123a can be bent first toward one open side of the receiving container 300 with a predetermined gap from the outer peripheral surface of the electrode assembly 100, and then bent a second time to be disposed on another surface of the electrode laminate facing the open side of the receiving container 300.

[0142] Based on the bent structure of the first electrode terminal piece 113a and the second electrode terminal piece 123a, a gap 300a can be formed between the outer peripheral surface of the electrode assembly 100 and the inner wall of the receiving tank 300.

[0143] Due to external impacts (such as vibration or dropping of a secondary battery), the electrode assembly 100 may move within the gap 300a and may be damaged due to external impacts.

[0144] refer to Figure 5 The first fixing member 230 may be configured to surround the first electrode tab 113a on the outer peripheral surface of the electrode assembly 100. The first fixing member 230 may be configured to press against the first electrode tab 113a, which is bent with a predetermined gap from the outer peripheral surface of the electrode assembly 100, to contact the outer peripheral surface of the electrode assembly 100. The second fixing member 240 may be configured to surround the second electrode tab 123a on the outer peripheral surface of the electrode assembly 100. The second fixing member 240 may be configured to press against the second electrode tab 123a, which is bent with a predetermined gap from the outer peripheral surface of the electrode assembly 100, to contact the outer peripheral surface of the electrode assembly 100.

[0145] The first fixing member 230 and the second fixing member 240 may be elastic and may be attached to the outer peripheral surface of the electrode assembly 100 for pressurization. The first fixing member 230 and the second fixing member 240 may be pressurized and housed together with the electrode assembly 100 in a housing 300.

[0146] The first fixing member 230 and the second fixing member 240 can each be accommodated in the receiving tank 300, and the first surfaces 231 and 241 (refer to...) Figure 2 The electrode contacts 113 and 123 are accessible, and the second surfaces 232 and 242, opposite to the first surfaces 231 and 241 (see reference). Figure 2 The electrode assembly 100 can contact the receiving tank 300. The first fixing member 230 and the second fixing member 240 can provide elasticity between the electrode assembly 100 and the receiving tank 300. The electrode assembly 100 can be secured in the receiving tank 300 by the elasticity provided by the first fixing member 230 and the second fixing member 240 without moving in the gap 300a.

[0147] Therefore, when the secondary battery experiences external impacts (such as vibration or drops), the electrode assembly 100 will not move to avoid damage. Additionally, the first fixing member 230 and the second fixing member 240 can absorb impacts transmitted from the outside to the electrode assembly 100.

[0148] refer to Figures 6 to 9 According to various embodiments of the present disclosure, the first fixing members 230a, 230b, 230c and 230d can be configured to surround the first electrode tab on the outer peripheral surface of the electrode assembly.

[0149] like Figure 6As shown, the first fixing member 230a may have an arcuate cross-section in a direction perpendicular to the stacking direction of the electrode stack. The first surface 231a of the first fixing member 230a that contacts the first electrode tab may be flat, and the second surface 232a that contacts the receiving container may be curved. For example, the first surface 231a of the first fixing member 230a may be coated with an adhesive and attached to the outer peripheral surface of the electrode assembly to surround the first electrode tab.

[0150] In another example, such as Figure 7 As shown, the first fixing member 230b may have a trapezoidal cross-section in a direction perpendicular to the stacking direction of the electrode stack. The first surface 231b of the first fixing member 230b that contacts the first electrode tab and the second surface 232b that contacts the receiving container may be flat. For example, the first surface 231b of the first fixing member 230b may be coated with an adhesive and attached to the outer peripheral surface of the electrode assembly to surround the first electrode tab. The width of the first surface 231b may be greater than the width of the second surface 232b to attach to the electrode assembly sufficiently to surround the first electrode tab.

[0151] In yet another example, such as Figure 8 As shown, the first fixing member 230c may have a stepped cross-section between the first surface 231c that contacts the first electrode terminal and the second surface 232c that contacts the receiving container in a direction perpendicular to the stacking direction of the electrode stack. For example, the first fixing member 230c may be formed as a stepped double-layer structure, but other structures are also possible.

[0152] In yet another example, such as Figure 9 As shown, the first fixing member 230d may comprise a porous material with elasticity (e.g., a porous insulating material). The first fixing member 230d may be pressurized within a receiving tank 300 (see reference). Figure 5 ) and electrode assembly 100 (reference) Figure 5 A porous material containing an electrolyte is formed, providing elasticity between the two components. The first fixing member 230d can be a porous material with a sponge structure, a honeycomb structure, or pores of various shapes, but other structures are also possible.

[0153] The second fixing member according to an embodiment of the present disclosure can be symmetrical to the first fixing members 230a, 230b, 230c and 230d with substantially the same structure. Therefore, a detailed description of the second fixing member will be omitted.

[0154] Figure 10 This is a view illustrating an example of an electrode assembly according to an embodiment of the present disclosure, and Figure 11 This is an example of viewing from above. Figure 10 An exploded view of a portion of the electrode assembly in region B.

[0155] refer to Figure 10 and Figure 11 The electrode stack 140 can be formed by alternately stacking multiple first electrodes 110, diaphragms 130 and second electrodes 120.

[0156] The first electrode tab 113 can be connected to one side of each of the plurality of first electrodes 110. For example, the first electrode tab 113 can be connected to a plurality of first uncoated portions 112 of a plurality of stacked first electrodes 110 by attaching a strip metal substrate to the plurality of first uncoated portions 112 of the plurality of stacked first electrodes 110 (see...). Figure 12 Each of the plurality of uncoated portions 112 can be formed. In another example, the first electrode tab 113 can be formed by stamping each of the plurality of uncoated portions 112 in a strip shape. The first electrode tab 113 may have the same material as the metal substrate (i.e., the first substrate) of the first electrode 110.

[0157] The plurality of first electrode tabs 113, each connected to the first uncoated portion 112, can be formed to face each other in the same direction. The plurality of first electrodes 110 can be connected to each other by welding. For example, the plurality of first electrode tabs 113 can be welded into a single tab. As another example, the plurality of first electrode tabs 113 can be welded to a first lead tab for bending and connection to the receiving container 300 (see reference). Figure 3 ).

[0158] The second electrode terminal 123 can be connected to one side of each of the plurality of second electrodes 120. The second electrode terminal 123 can be connected to the second electrode 120 in a direction opposite to the direction in which the first electrode terminal 113 is formed. For example, the second electrode terminal 123 can be connected to the second uncoated portion 122 of the plurality of stacked second electrodes 120 by connecting a strip metal substrate (see...). Figure 12 Each of the following can be formed. In another example, the second electrode tab 123 can be formed by stamping each of the second uncoated portions 122 in a strip shape. The second electrode tab 123 can have the same material as the metal substrate (i.e., the second substrate) of the second electrode 120.

[0159] The plurality of second electrode tabs 123, each connected to the second uncoated portion 122, can face each other in the same direction. The plurality of second electrode tabs 123 can be connected to each other by welding. For example, the plurality of second electrode tabs 123 can be welded together and formed as a single tab. As another example, the plurality of second electrode tabs 123 can be welded to a second lead tab for bending and connection to the cover assembly 400 (see reference). Figure 3 ).

[0160] According to an embodiment, the first electrode 110, the diaphragm 130, and the second electrode 120 can be formed in a circular shape to correspond to the receiving space of the receiving container 300. The first electrode 110 can be used as a negative electrode, and the second electrode 120 can be used as a positive electrode, and the area of ​​the first electrode 110 can be larger than the area of ​​the second electrode 120. For example, the radius of the second electrode 120 can be smaller than the radius of the first electrode 110. In other embodiments, the radius of the second electrode 120 can be larger than the radius of the first electrode 110. The area of ​​the diaphragm 130 disposed between the first electrode 110 and the second electrode 120 can be larger than the area of ​​the first electrode 110 and the area of ​​the second electrode 120 (e.g., either the area of ​​the first electrode 110 or the area of ​​the second electrode 120) to prevent short circuits between the first electrode 110 and the second electrode 120.

[0161] According to an embodiment, a diaphragm 130 may be disposed between the first electrode 110 and the second electrode 120, but the area of ​​the first electrode 110 may be larger than the area of ​​the second electrode 120 to cause (for example, this may cause) a short circuit between the first electrode 110 and the second electrode 120. Therefore, an insulating layer 124 may be placed in a region of the second electrode 120 facing the first electrode 110 to prevent short circuits.

[0162] Figure 12 This is a view illustrating an example of a first electrode and a second electrode according to an embodiment of the present disclosure.

[0163] refer to Figure 12 According to embodiments of the present disclosure, the first electrode 110 may include a first coated portion 111 and a first uncoated portion 112. The first coated portion 111 may be coated with a first active material on the inner side of a predetermined chord 150 on the outer periphery of a circular substrate (e.g., a circular first substrate). The first uncoated portion 112 may be uncoated with the first active material on the outer side of the predetermined chord 150 on the outer periphery of a circular substrate (e.g., a circular first substrate).

[0164] The second electrode 120 may include a second coated portion 121 and a second uncoated portion 122. The second coated portion 121 may be coated with a second active material on the inner side of a predetermined chord 150 on the outer periphery of a circular substrate (e.g., a circular second substrate). The second uncoated portion 122 may be uncoated with the second active material on the outer side of the predetermined chord 150 on the outer periphery of a circular substrate (e.g., a circular second substrate).

[0165] According to an embodiment, a predetermined chord 150 on the circular substrate of the first electrode 110 and the second electrode 120 can be set to have an angle (θ') of 30° to 60° between the center of the circular substrate and the connecting lines at both ends of the predetermined chord 150. This angle allows the first electrode tab 113 and the second electrode tab 123 to be formed in opposite directions, and allows the first electrode tab 113 and the second electrode tab 123 to be stably connected to the first uncoated portion 112 and the second uncoated portion 122 respectively by welding, so as to fully coat the active material. The above angle range is merely exemplary, and other angle ranges are also possible.

[0166] Figure 13 This is a view illustrating the placement of the first contact member, the second contact member, the first fixing member, and the second fixing member on the electrode assembly.

[0167] refer to Figure 13 According to embodiments of this disclosure, based on the stacking orientation of the electrode stack 140, the first contact member 210 can be placed on the lower surface of the electrode stack 140. The first electrode tab 113 can be bent to be placed on the lower surface of the first contact member 210. The first contact member 210 can be placed between the bent first electrode tab 113 and the lower surface of the electrode stack 140.

[0168] Based on the stacking orientation of the electrode stack 140, the second contact member 220 can be placed on the upper surface of the electrode stack 140. The second electrode tab 123 can be bent to be placed on the upper surface of the second contact member 220. The second contact member 220 can be placed between the bent second electrode tab 123 and the upper surface of the electrode stack 140.

[0169] The first fixing member 230 may be positioned around the first electrode tab 113 on the outer peripheral surface of the electrode assembly 100. The first fixing member 230 may be configured to press against the first electrode tab 113, which is bent with a predetermined gap from the outer peripheral surface of the electrode assembly 100, to contact the outer peripheral surface of the electrode assembly 100.

[0170] The second fixing member 240 can be positioned around the second electrode tab 123 on the outer peripheral surface of the electrode assembly 100. The second fixing member 240 can be configured to press against the second electrode tab 123, which is bent with a predetermined gap from the outer peripheral surface of the electrode assembly 100, to contact the outer peripheral surface of the electrode assembly 100.

[0171] Figure 14 This is a cross-sectional view illustrating a terminal block according to an embodiment of the present disclosure.

[0172] refer to Figure 14The terminal block 410 may include a body 411 connected to the second electrode 120 and a protrusion 412 protruding upward from the center of the body 411.

[0173] The body 411 may have a shape corresponding to a surface of the electrode stack 140 facing the body 411. The diameter D1 of the body 411 may be equal to or greater than the diameter D2 of the electrode stack 140 (e.g., its outer peripheral surface).

[0174] The diameter D1 of the body 411 can be equal to or greater than the diameter D2 of the electrode stack 140, such that when the receiving container 300 is attached to the cover assembly 400, the cover assembly 400 can apply downward pressure to adequately pressurize the first contact member 210 and the second contact member 220.

[0175] Figure 15 This is an exploded perspective view illustrating a cover assembly according to an embodiment of the present disclosure.

[0176] refer to Figure 15 The protrusion 412 of the terminal plate 410 can protrude upward from the center of the body 411. The protrusion 412 can pass through the first opening of the cover plate 420.

[0177] The diameter d1 of the protrusion 412 of the terminal plate 410 can be smaller than the inner diameter d3 of the first opening of the cover plate 420 and the inner diameter d2 of the second opening of the cover insulating layer 430. The diameter d1 of the protrusion 412 of the terminal plate 410 can be smaller than the inner diameter d3 of the first opening and the inner diameter d2 of the second opening, so that the protrusion 412 can pass through the first opening and the second opening to connect to the external terminal.

[0178] The inner diameter d2 of the second opening of the cover insulation layer 430 can be smaller than the inner diameter d3 of the first opening of the cover plate 420. Therefore, the protrusion 412 of the terminal plate 410 can be prevented from contacting the first opening of the cover plate 420.

[0179] Figure 16 This is a view illustrating the connection relationship between the cover assembly and the electrode assembly.

[0180] refer to Figure 16 The second contact member 220 may be disposed on top of the electrode stack 140. The second electrode tab 123 may be bent to be disposed on the second contact member 220. The cover assembly 400 may seal the receiving container 300 such that the terminal plate 410 may be placed on (e.g., on top of) the second contact member 220. The second electrode tab 123 may be disposed between the second contact member 220 and the terminal plate 410. Without a separate process such as soldering, the terminal plate 410 may be electrically connected to the second electrode 120 via the second electrode tab 123.

[0181] During the process of sealing the containment tank 300, the cover assembly 400 can pressurize the second contact member 220 and the electrode stack 140. The second contact member 220 can be compressed between the cover assembly 400 and the electrode stack 140 by the transmitted pressure. When the second contact member 220 is compressed, the second electrode tab 123 can be tightly attached to an inner surface of the cover assembly 400.

[0182] Figure 17 This is a view illustrating the connection relationship between the electrode assembly and the receiving tank according to an embodiment of the present disclosure.

[0183] refer to Figure 17 According to an embodiment, the first contact member 210 can be placed below the electrode stack 140. The first electrode tab 113 can be bent and placed below the first contact member 210. When the electrode assembly 100 is housed in the receiving container 300, the first electrode tab 113 can be placed between the first contact member 210 and the receiving container 300. Without a separate process such as welding, the receiving container 300 can be electrically connected to the first electrode 110 via the first electrode tab 113.

[0184] During the process of sealing the container 300, the cover assembly 400 can apply pressure to the first contact member 210 and the electrode stack 140. The first contact member 210 can be compressed between the electrode stack 140 and the container 300 by the transmitted pressure. When the first contact member 210 is compressed, the first electrode tab 113 can be tightly attached to an inner surface of the container 300.

[0185] Figure 18 This is a flowchart illustrating a method for manufacturing a secondary battery according to embodiments of the present disclosure.

[0186] refer to Figure 18 A method for manufacturing a secondary battery according to an embodiment may include: forming an electrode assembly in step S100, the electrode assembly including an electrode stack formed by alternately stacking a first electrode, a separator, and a second electrode, a first electrode terminal connected to the first electrode, and a second electrode terminal connected to the second electrode; arranging (e.g., placing) a first contact member on the electrode stack in step S200, and bending and placing the first electrode terminal on the first contact member; arranging (e.g., placing) a first fixing member on the outer peripheral surface of the electrode assembly to surround the first electrode terminal; accommodating the electrode assembly in step S400 in a receiving container having an open side; and attaching a cover assembly to the open side of the receiving container in step S500 to connect the first electrode terminal to the receiving container. Reference Figures 1 to 3 Steps S100 to S500 will be described in detail below.

[0187] In step S100, an electrode assembly 100 may be formed, comprising an electrode stack 140 formed by alternately stacking a plurality of first electrodes 110, a plurality of diaphragms 130, and a plurality of second electrodes 20, a first electrode tab 113 connected to the first electrodes 110, and a second electrode tab 123 connected to the second electrodes 120. The first electrodes 110 may include a predetermined chord 150 (see reference) on the outer periphery of a circular substrate (e.g., a circular first substrate). Figure 12 The first coated portion of the electrode 120 may have a first coated portion on the inner side of the predetermined chord 150, in which the first active material is coated, and an uncoated portion on the outer side of the electrode relative to the predetermined chord 150, in which the first active material is not coated. The second electrode 120 may include a second coated portion on the outer periphery of the circular substrate (e.g., a circular second substrate) in which the second active material is coated, and a second uncoated portion on the outer side of the electrode relative to the predetermined chord 150, in which the second active material is not coated.

[0188] In step S200, the first contact member 210 can be placed on the electrode stack 140. The first electrode tab 113 can be bent and (e.g., in) Figure 3 The first contact member 210 is arranged (from below) in the orientation of the electrode stack 140. The second contact member 220 can be arranged on the opposite side of the electrode stack 140 from the side where the first contact member 210 is located. The second electrode tab 123 can be bent and arranged on the second contact member 220.

[0189] In step S300, the first fixing member 230 may be placed on the outer peripheral surface of the electrode assembly 100 to surround the first electrode tab 113. The first fixing member 230 may be positioned to press against the first electrode tab 113, which is bent with a predetermined gap to the outer peripheral surface of the electrode assembly 100, to contact the outer peripheral surface of the electrode assembly 100.

[0190] Alternatively, a second fixing member 240 can be placed around the second electrode tab 123 on the outer peripheral surface of the electrode assembly. The second fixing member 240 can be positioned to press the second electrode tab 123, which is bent with a predetermined gap to the outer peripheral surface of the electrode assembly 100, to contact the outer peripheral surface of the electrode assembly 100.

[0191] In step S400, the electrode assembly 100 can be housed in a receiving container 300 having an open side. A first electrode connector 113 can be placed between the electrode assembly 100 and an inner side of the receiving container 300. The receiving container 300 can be connected to the first electrode connector 113. The receiving container 300 can be connected to the first electrode 110 via the first electrode connector 113 to serve as a negative electrode.

[0192] The first fixing member 230 and the second fixing member 240 can be pressurized and housed together with the electrode assembly 100 in the receiving container 300. Each of the first fixing member 230 and the second fixing member 240 can be housed in the receiving container 300, a first surface of each of the first fixing member 230 and the second fixing member 240 can contact a corresponding one of the first electrode tabs 113 and the second electrode tab 123, and a second surface of each of the first fixing member 230 and the second fixing member 240 opposite to the first surface can contact the receiving container 300. The first fixing member 230 and the second fixing member 240 can provide elasticity between the electrode assembly 100 and the receiving container 300. Due to the elasticity provided by the first fixing member 230 and the second fixing member 240, the electrode assembly 100 can be secured without movement within the gap between the outer peripheral surface of the electrode assembly 100 and the inner wall of the receiving container 300.

[0193] In step S500, one open side of the receiving container 300 may be sealed by the cover assembly 400 to connect the second electrode connector 123 to the cover assembly 400. The cover assembly 400 may be connected to the second electrode 120 via the second electrode connector 123 to serve as a positive electrode.

[0194] The first contact member 210 can be pressurized by pressure transmitted from the electrode stack 140 to tightly attach the first electrode tab 113 to the receiving container 300. The second contact member 220 can be pressurized by pressure transmitted from the electrode stack 140 to tightly attach the second electrode tab 123 to the cover assembly 400.

[0195] Since the contact members 210 and 220 and the fixing members 230 and 240 are placed on the electrode assembly 100, the secondary battery 1 manufactured by the above manufacturing method can prevent damage to the internal components of the secondary battery caused by external impacts (such as vibration, drops, etc.).

[0196] When wound electrode assemblies are used in coin or button cells, deformation or cracking due to electrode expansion limits capacity. To address this issue, stacked electrode assemblies can be used, where the continuity of expansion is controlled by using an array of discontinuous electrodes. However, in the case of stacked electrode assemblies, the gap between the housing and the electrode assembly is larger than in the case of wound electrode assemblies. When external impacts such as vibration or drops occur, the electrode assembly may shift within this gap, increasing the risk of damage.

[0197] According to embodiments of the present disclosure, a fixing member is placed on the outer peripheral surface of the electrode assembly around the electrode tabs, and the fixing member provides elasticity between the receiving tank and the electrode assembly, thereby preventing the electrode assembly from moving within the receiving tank.

[0198] According to embodiments of this disclosure, resilient contact members are placed between the electrode assembly and the receiving tank and / or between the electrode assembly and the cover assembly, thereby connecting the electrode terminals, the receiving tank, and the cover assembly without separate welding.

[0199] According to embodiments of the present disclosure, in the manufacturing process of a circular stacked electrode assembly, a circular electrode plate structure is provided to stably connect the electrode tabs and increase the coating area of ​​the active material.

[0200] According to embodiments of this disclosure, fixing members and / or contact members are placed on the electrode assembly to prevent damage to the internal components of the secondary battery due to external impacts such as vibration or dropping.

[0201] While this disclosure has been described above with reference to embodiments thereof, it is not limited thereto. Those skilled in the art can make various modifications and variations thereto within the spirit and equivalent scope of the claims.

[0202] Example embodiments have been disclosed herein. Although specific terminology has been used, they are used and interpreted in a general and descriptive sense only and are not intended to be limiting. In some cases, as will be apparent to those skilled in the art at the time of filing this application, unless otherwise specifically stated, features, characteristics, and / or elements described in connection with particular embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments. Accordingly, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

Claims

1. A secondary battery, comprising: An electrode assembly includes an electrode stack formed by alternately stacking a first electrode, a diaphragm, and a second electrode, each having a circular shape; a first electrode terminal connected to the first electrode; and a second electrode terminal connected to the second electrode. A receiving container having an open side for receiving the electrode assembly, the receiving container being electrically connected to the first electrode terminal piece; A lid assembly, configured to seal one open side of the receiving container, is electrically connected to the second electrode terminal block; A first contact member is located between a surface of the electrode stack and the first electrode tab, the surface of the electrode stack facing the bottom surface of the receiving container; and A first fixing member surrounds the first electrode terminal piece between the inner wall of the receiving tank and the outer peripheral surface of the electrode assembly.

2. The secondary battery according to claim 1, wherein the first fixing member comprises: The first surface contacts the first electrode terminal piece; as well as The second surface contacts the container. Along the circumference of the electrode assembly, the width of the first surface is greater than the width of the second surface.

3. The secondary battery according to claim 2, wherein the cross-section of the first fixing member perpendicular to the stacking direction of the electrode stack has an arc shape.

4. The secondary battery according to claim 2, wherein the cross-section of the first fixing member perpendicular to the stacking direction of the electrode stack has a trapezoidal shape.

5. The secondary battery according to claim 2, wherein the cross section of the first fixing member perpendicular to the stacking direction of the electrode stack has a stepped shape between the first surface and the second surface.

6. The secondary battery according to claim 2, wherein the first fixing member is bonded to the first electrode tab by an adhesive coated on the first surface.

7. The secondary battery according to claim 1, further comprising a second fixing member surrounding the second electrode tab between the inner wall of the receiving container and the outer peripheral surface of the electrode assembly.

8. The secondary battery according to claim 7, wherein the second fixing member comprises: The first surface contacts the second electrode terminal piece; as well as The second surface contacts the container. Along the circumference of the electrode assembly, the width of the first surface is greater than the width of the second surface.

9. The secondary battery according to claim 8, wherein the cross-section of the second fixing member perpendicular to the stacking direction of the electrode stack has an arc shape.

10. The secondary battery according to claim 8, wherein the cross-section of the second fixing member perpendicular to the stacking direction of the electrode stack has a trapezoidal shape.

11. The secondary battery according to claim 8, wherein the cross section of the second fixing member perpendicular to the stacking direction of the electrode stack has a stepped shape between the first surface and the second surface.

12. The secondary battery according to claim 7, wherein at least one of the first fixing member and the second fixing member comprises an insulating material, the insulating material comprising at least one of polypropylene, polyimide and polyethylene terephthalate.

13. The secondary battery according to claim 7, wherein at least one of the first fixing member and the second fixing member comprises a porous insulating material.

14. The secondary battery according to any one of claims 1 to 13, wherein the first electrode comprises: A first coating portion is coated with a first active substance on the inner side of a predetermined first chord on the outer periphery of a circular first substrate. And the first uncoated portion outside the predetermined first string that is not coated with the first active material, and The second electrode includes a second coating portion on the inner side of a predetermined second chord on the outer periphery of a circular second substrate, the second coating portion being coated with a second active material; And the second uncoated portion outside the predetermined second string that is not coated with the second active material.

15. The secondary battery according to any one of claims 1 to 13, wherein the first electrode terminal is attached to the bottom surface of the receiving tank by pressure from the electrode stack in response to the cap assembly being coupled to the receiving tank.

16. The secondary battery according to any one of claims 1 to 13, further comprising a second contact member between the other surface of the electrode stack facing the second electrode tab and the bottom surface of the cover assembly.

17. The secondary battery of claim 16, wherein the second electrode tab is attached to the bottom surface of the cover assembly by pressure from the electrode stack in response to the cap assembly being coupled to the receiving tank.

18. The secondary battery according to any one of claims 1 to 13, wherein the cover assembly comprises: Terminal block, connected to the second electrode connector; A cover plate, including a first opening, the cover plate being connected to the open side of the receiving tank; as well as An insulating cover, including a second opening, is provided between the terminal block and the cover plate for insulation.

19. The secondary battery according to claim 18, wherein the terminal block comprises: The main body is connected to the second electrode terminal piece; as well as A protrusion protrudes upward from the center of the body, the protrusion passing through the first opening and the second opening, wherein the diameter of the body is larger than the diameter of the outer peripheral surface of the electrode stack.

20. A method for manufacturing a secondary battery, the method comprising: An electrode assembly is formed, the electrode assembly comprising an electrode stack formed by alternately stacking a first electrode, a diaphragm and a second electrode each having a circular shape, a first electrode terminal connected to the first electrode and a second electrode terminal connected to the second electrode; The first contact member is arranged on the electrode stack, and the first electrode terminal is bent and placed on the first contact member; The first fixing member is arranged on the outer peripheral surface of the electrode assembly to surround the first electrode terminal piece; The electrode assembly is housed in a container having an open side; as well as The first electrode terminal is connected to the container by attaching the cover assembly to one of the open sides of the container.

Images