Secondary battery

Abstract

A secondary battery includes: an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab connected to the first electrode, and a second electrode tab connected to the second electrode; the containing tank is used for containing the electrode assembly, and the containing tank is provided with an opening; and a cap assembly sealing the one opening of the accommodation can, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab, where the cap assembly further includes a cap plate including a first terminal hole and a second terminal hole, the first terminal hole and the second terminal hole being formed between the first electrode tab and the second electrode tab. The first electrode terminal is exposed to the outside through the first terminal hole, and the second electrode terminal is exposed to the outside through the second terminal hole.

Description

Technical Field

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

[0002] Recently, with the increasing demand for wearable devices using Bluetooth, such as headphones, in-ear headphones, smartwatches, and body-attached medical devices, the demand for rechargeable batteries with high energy density and sufficiently small size is also increasing. These rechargeable batteries are manufactured in the form of a cylindrical can housing electrode components, the height of which is significantly less than its width, depending on the characteristics of the usage environment. These rechargeable batteries can be referred to as coin cells or button cells.

[0003] 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

[0004] An embodiment includes a secondary battery comprising: an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode terminal connected to the first electrode, and a second electrode terminal connected to the second electrode; a container housing the electrode assembly having an opening; and a cover assembly sealing the opening of the container, the cover assembly including a first electrode terminal connected to the first electrode terminal and a second electrode terminal connected to the second electrode terminal, wherein the cover assembly further includes a cover plate including a first terminal hole and a second terminal hole, the first electrode terminal being exposed to the outside through the first terminal hole, and the second electrode terminal being exposed to the outside through the second terminal hole.

[0005] The cover assembly may include a cover insulating layer, the cover insulating layer including a first through hole corresponding to the first terminal hole and a second through hole corresponding to the second terminal hole, and can insulate the space between the first electrode terminal and the second electrode terminal and the cover plate, and the first electrode terminal can be exposed through the first terminal hole and the first through hole, and the second electrode terminal can be exposed through the second terminal hole and the second through hole.

[0006] The first electrode terminal and the second electrode terminal may be spaced apart from each other.

[0007] The first electrode terminal may include: a bottom portion connected to the first electrode tab; and a terminal portion protruding from the bottom portion and exposed through the first terminal hole and the first through hole, wherein the second electrode terminal may include: a bottom portion connected to the second electrode tab; and a terminal portion protruding from the bottom portion of the second electrode terminal and exposed through the second terminal hole and the second through hole.

[0008] The stepped recessed areas around the first through hole and the stepped recessed areas around the second through hole can be in the cover insulating layer, the bottom portion of the first electrode terminal can contact the recessed area around the first through hole, and the bottom portion of the second electrode terminal can contact the recessed area around the second through hole.

[0009] The container and the cover can be electrically insulated from the first electrode and the second electrode.

[0010] The container and the cover may contain the same material.

[0011] The container and the cover may contain polymer materials.

[0012] The container and the cover can be joined by heat fusion.

[0013] The container and the cover may be made of metal.

[0014] The container and the cover can be connected by a metal connection.

[0015] The secondary battery may further include a first insulating member disposed around the bottom and side surfaces of the interior of the accommodating tank.

[0016] The second electrode tab can be bent and connected to the second electrode terminal.

[0017] The secondary battery may further include a second insulating member that insulates the second electrode terminal, wherein a first side of the bent portion of the second electrode terminal can be connected to the second electrode terminal, and a second side of the bent portion of the second electrode terminal can be insulated from the first electrode by the second insulating member.

[0018] The first terminal hole and the second terminal hole may have shapes that are symmetrical to each other.

[0019] The first terminal hole and the second terminal hole may have shapes that are axially symmetrical to each other.

[0020] The cover plate may further include a bridging portion between the first terminal hole and the second terminal hole.

[0021] The bridging portion may have a strip shape.

[0022] The first electrode terminal may contain at least one of stainless steel and nickel.

[0023] The second electrode terminal may contain aluminum.

[0024] This disclosure is made to address the technical problems identified herein, and embodiments of this disclosure provide a secondary battery for addressing the problems identified herein, as well as a method for manufacturing the secondary battery.

[0025] However, the technical problems to be solved by this disclosure are not limited to the above-mentioned problems, and those skilled in the art will clearly understand from the following description of this disclosure other problems not mentioned herein, as well as the aspects and features of this disclosure that will solve these problems.

[0026] 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 present. Attached Figure Description

[0027] The accompanying drawings illustrate embodiments of the present disclosure and, together with the detailed description thereof, further describe aspects and features of the disclosure. Therefore, this disclosure should not be construed as limited to the drawings.

[0028] 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:

[0029] Figure 1 This is a perspective view of a secondary battery according to one or more embodiments of the present disclosure;

[0030] Figure 2 It is shown Figure 1 A view of section AA;

[0031] Figure 3 This is a view showing the upper surface of a cover assembly according to one or more embodiments of the present disclosure;

[0032] Figure 4 This is a view showing the lower surface of a cover assembly according to one or more embodiments of the present disclosure;

[0033] Figure 5 This is a view showing a cover plate according to one or more embodiments of the present disclosure;

[0034] Figure 6This is a view showing the lower surface of the cover insulation layer according to one or more embodiments of the present disclosure;

[0035] Figure 7 This is a view showing a first electrode terminal and a second electrode terminal according to one or more embodiments of the present disclosure;

[0036] Figure 8 This is a view illustrating a secondary battery further comprising a first insulating member according to one or more embodiments of the present disclosure;

[0037] Figure 9 This is a view illustrating a secondary battery further comprising a second insulating member according to one or more embodiments of the present disclosure; and

[0038] Figure 10 This is a view illustrating a method for manufacturing a secondary battery according to another embodiment of the present disclosure. Detailed Implementation

[0039] Exemplary embodiments will now be described more fully below 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 comprehensive and complete, and will fully convey exemplary implementation methods to those skilled in the art.

[0040] 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 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, and one or more intervening layers may 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 be present. Similar reference numerals always refer to similar elements.

[0041] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as limited to their general or dictionary meanings, and should be interpreted as being consistent with the technical spirit of the present 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 embodiments.

[0042] The embodiments described in this specification and the configurations shown in the accompanying drawings are only some of the embodiments of this disclosure and do not represent all the technical ideas, aspects, and features of this disclosure. 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.

[0043] 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.

[0044] 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 “substantially,” “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.

[0045] 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.

[0046] 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 will 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.

[0047] 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.

[0048] 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.

[0049] 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 average value.

[0050] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0051] Arranging any element "above (or below)" or "above (below)" another element can mean that the arbitrary element can be configured to contact the upper (or lower) surface of the element, and the other element can also be located between the element and the arbitrary element disposed on (or below) the element.

[0052] 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.

[0053] 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.

[0054] Figure 1 This is a perspective view of a secondary battery according to an embodiment of the present disclosure. Figure 2 It is shown Figure 1 A view of section AA.

[0055] The secondary battery 1 according to one or more embodiments is a micro secondary battery, and can be a coin cell battery or a button cell battery, but can also be a cylindrical or needle-shaped battery.

[0056] A coin cell or button cell is a battery in the form of a thin coin or button, and can refer to a battery with a height-to-diameter ratio (height / diameter) of less than 1, although this ratio can vary. Because coin cells or button cells are generally cylindrical, their horizontal cross-section is generally circular. However, the horizontal cross-section can have an elliptical or polygonal shape. The diameter can refer to the maximum horizontal distance of the battery, and the height can refer to the maximum vertical distance of the battery (e.g., the distance from the bottom to the top of the battery).

[0057] refer to Figure 1 and Figure 2 The secondary battery 1 according to one or more embodiments of the present disclosure may include an electrode assembly 100, a container 200, and a cover assembly 300.

[0058] According to one or more embodiments, the secondary battery 1 can be a coin cell battery or a button cell battery, but it can also be a cylindrical or needle-shaped battery.

[0059] The electrode assembly 100 may include a first electrode 110, a second electrode 120, a diaphragm 130, a first electrode terminal 111 connected to the first electrode 110, and a second electrode terminal 121 connected to the second electrode 120. The first electrode 110 may be a negative electrode, and the second electrode 120 may be a positive electrode. Of course, the reverse is also possible. For example, the electrode assembly 100 may be a wound electrode assembly 100 formed by inserting a diaphragm 130, which serves as an insulator, between the first electrode 110 and the second electrode 120, followed by winding; however, other solutions are also possible.

[0060] According to one or more embodiments, the first electrode 110 may include: coated portions, which are areas on both surfaces of a first substrate formed of a thin metal plate to which an active material is applied; and uncoated portions, which are areas of the first substrate exposed due to the absence of an active material. The first electrode 110 may include uncoated portions formed on both side surfaces of the first substrate in a winding length direction. The first electrode 110 can be formed as a negative electrode by coating a metal substrate such as copper, a copper alloy, nickel, or a nickel alloy with a negative electrode active material such as graphite or carbon.

[0061] According to one or more embodiments, the second electrode 120 may include: coated portions, which are areas on both surfaces of a second substrate formed of a thin metal plate to which an active material is applied; and uncoated portions, which are areas of the second substrate exposed due to the absence of an active material. The second electrode 120 may include uncoated portions formed on both side surfaces of the second substrate in the winding length direction. The second electrode 120 may be formed as a positive electrode by coating a positive electrode active material, such as a transition metal oxide, onto a metal substrate such as aluminum or an aluminum alloy.

[0062] According to one or more embodiments, a separator 130 may be located between the first electrode 110 and the second electrode 120. The separator 130 may insulate the first electrode 110 and the second electrode 120 and exchange lithium ions between them. The separator 130 may have sufficient length to completely insulate the space between the first electrode 110 and the second electrode 120 even as the electrode assembly 100 contracts or expands during the charging and discharging process of the secondary battery 1.

[0063] The first electrode contact 111 can be disposed on the outer surface of the electrode assembly 100. The first electrode contact 111 can be formed separately and connected to the uncoated portion of the first electrode 110, or it can be formed by stamping off a portion of the uncoated portion.

[0064] The first electrode connector 111 can be bent on a surface of the electrode assembly 100 facing the cover assembly 300 and connected to the first electrode terminal 330 of the cover assembly 300. The first electrode 110 and the first electrode terminal 330 can be electrically connected through the first electrode connector 111.

[0065] The second electrode contact 121 can be disposed on the outer surface of the electrode assembly 100. The second electrode contact 121 can be formed separately and connected to the uncoated portion of the second electrode 120, or it can be formed by stamping off a portion of the uncoated portion.

[0066] The second electrode connector 121 can be bent on one surface of the electrode assembly 100 facing the cover assembly 300 and connected to the second electrode terminal 340 of the cover assembly 300. The second electrode 120 and the second electrode terminal 340 can be electrically connected through the second electrode connector 121.

[0067] The container 200 has an opening to receive the electrode assembly 100. The container 200 can form the overall appearance of the secondary battery 1. For example, the container 200 can have an open cylindrical shape. The container 200 can include a circular bottom surface and sidewalls extending vertically from the periphery of the bottom surface. In the container 200, the diameter of the bottom surface can be formed to be greater than the height of the sidewalls, such that the secondary battery 1 can be configured as a button-type or coin-type battery. In other embodiments, the diameter of the bottom surface of the container 200 can be formed to be smaller than the height of the sidewalls.

[0068] The upper surface of the container 200 facing the bottom surface can be opened to expose a receiving space capable of receiving the electrode assembly 100. After the electrode assembly 100 is received in the container 200, the electrode assembly 100 can be sealed by covering one opening of the container 200 with the cover assembly 300. Specifically, the upper end of the sidewall of the container 200 can have a step from the outside to the inside. The cover plate 310 of the cover assembly 300 can be engaged with the upper end of the sidewall of the container 200 by performing at least one of heat fusion (e.g., UV curing) and metal bonding (e.g., welding, brazing, soldering, etc.) to mate with the step at the upper end of the sidewall of the container 200, but other solutions are also possible.

[0069] The container 200 may be insulated from the first electrode 110 and the second electrode 120. The container 200 may not be polarized and may not be connected to the first electrode 110, the second electrode 120, the first electrode terminal 111, and the second electrode terminal 121.

[0070] The cap assembly 300 can seal an opening of the container 200. The cap assembly 300 can cover an opening of the container 200 to seal the electrode assembly 100 from the outside.

[0071] The cover assembly 300 may include a cover plate 310, a cover insulating layer 320, a first electrode terminal 330, and a second electrode terminal 340.

[0072] Cover plate 310 may include first terminal hole 311 (reference) Figure 5 ) and second terminal hole 312 (reference) Figure 5 The first electrode terminal 330 is exposed to the outside through the first terminal hole 311, and the second electrode terminal 340 is exposed to the outside through the second terminal hole 312. The first terminal hole 311 and the second terminal hole 312 can be formed in a symmetrical structure in the cover plate 310.

[0073] The cover 310 can be joined to the upper end of the sidewall of the container 200. The cover 310 may contain the same material as the container 200, and depending on the material, the cover 310 may be heat-fused to join with the container 200, or metal-bonded to the container 200. As an example, the container 200 and the cover 310 may contain a polymer material, but any material that is a high-strength, heat-resistant, and chemically resistant non-metallic material can be used. The container 200 and the cover 310 may contain a polymer material and can be joined by heat fusion. In another embodiment, the container 200 and the cover 310 may contain a metallic material. For example, the metallic material may include metals such as stainless steel (SUS), aluminum, aluminum alloys, or nickel-plated steel, but other examples are also possible. The container 200 and the cover 310 may contain a metallic material and can be joined by metal bonding.

[0074] The cover plate 310 can be insulated from the first electrode 110 and the second electrode 120. The container 200 can be insulated from the first electrode 110, the second electrode 120, the first electrode terminal 111 and the second electrode terminal 121, and therefore can be non-polar.

[0075] The cover insulation layer 320 may be disposed on one surface (e.g., the lower surface) of the cover plate 310 to insulate the first electrode terminal 330 and the second electrode terminal 340 from the cover plate 310.

[0076] The first electrode terminal 330 can be connected to the first electrode connector 111. The first electrode terminal 330 can pass through the first terminal hole 311 of the cover plate 310 (see reference). Figure 5 The first electrode terminal 330 may be exposed to the outside through the first terminal hole 311 of the cover plate 310. The first electrode terminal 330 may be spaced apart from the first terminal hole 311 of the cover plate 310 and may not be in contact with the cover plate 310.

[0077] The second electrode terminal 340 can be connected to the second electrode connector 121. The second electrode terminal 340 can be connected through the second terminal hole 312 of the cover plate 310 (see reference). Figure 5 The second electrode terminal 340 may be exposed to the outside through the second terminal hole 312 of the cover plate 310. The second electrode terminal 340 may be spaced apart from the second terminal hole 312 of the cover plate 310 and may not be in contact with the cover plate 310.

[0078] Figure 3 This is a view showing the upper surface of a cover assembly according to an embodiment of the present disclosure. Figure 4 This is a view showing the lower surface of a cover assembly according to an embodiment of the present disclosure. Figure 5 This is a view showing a cover plate according to an embodiment of the present disclosure. Figure 6 This is a view showing the lower surface of the cover insulation layer according to an embodiment of the present disclosure. Figure 7 This is a view showing the first electrode terminal and the second electrode terminal according to an embodiment of the present disclosure.

[0079] refer to Figures 3 to 7 The cover assembly 300 according to one or more embodiments of the present disclosure may include a cover plate 310, a cover insulating layer 320, a first electrode terminal 330, and a second electrode terminal 340.

[0080] A cover plate 310 may be disposed on a cover insulating layer 320. The cover plate 310 may engage with the container 200 while covering one opening of the container 200. A first electrode terminal 330 may be exposed to the outside through a first terminal hole 311 formed in the cover plate 310. A second electrode terminal 340 may be exposed through a second terminal hole 312 formed in the cover plate 310. The cover insulating layer 320 may be disposed between the cover plate 310 and the first electrode terminal 330 and the second electrode terminal 340. The cover insulating layer 320 may insulate the space between the cover plate 310 and the first electrode terminal 330, and the space between the cover plate 310 and the second electrode terminal 340.

[0081] like Figure 5 As shown, the cover plate 310 may include a first terminal hole 311 and a second terminal hole 312, with the first electrode terminal 330 exposed to the outside through the first terminal hole 311 and the second electrode terminal 340 exposed to the outside through the second terminal hole 312.

[0082] The first terminal hole 311 and the second terminal hole 312 may have shapes that are symmetrical to each other. The first terminal hole 311 and the second terminal hole 312 may have shapes that are axially symmetrical to each other.

[0083] The cover plate 310 may further include a bridging portion 313 formed between the first terminal hole 311 and the second terminal hole 312. The bridging portion 313 may be formed in a strip shape. The first terminal hole 311 and the second terminal hole 312 may have shapes that are symmetrical to each other with respect to the bridging portion 313.

[0084] like Figure 6 As shown, the cover insulating layer 320 may include a first through hole 321 corresponding to (e.g., aligned with) the first terminal hole 311 and a second through hole 322 corresponding to the second terminal hole 312. Stepped recessed regions 321a and 322a may be formed on the lower surface of the cover insulating layer 320 around the first through hole 321 and the second through hole 322, respectively.

[0085] The recessed region 321a formed around the first through hole 321 can be contacted by the bottom portion 331 of the first electrode terminal 330. For example, the bottom portion 331 of the first electrode terminal 330 can be fitted and fixed into the recessed region 321a formed around the first through hole 321. The recessed region 322a formed around the second through hole 322 can contact the bottom portion 341 of the second electrode terminal 340. For example, the bottom portion 341 of the second electrode terminal 340 can be fitted and fixed into the recessed region 322a formed around the second through hole 322.

[0086] Adhesive components can be applied to the recessed regions 321a and 322a so that the bottom portion 331 of the first electrode terminal 330 and the bottom portion 341 of the second electrode terminal 340, which are in contact with the recessed regions 321a and 322a respectively, can be fixed, but other examples are also possible.

[0087] like Figure 7 As shown, the first electrode terminal 330 and the second electrode terminal 340 may have a symmetrical structure.

[0088] The first electrode terminal 330 may include a connection to the first electrode tab 111 (reference). Figure 2 The first electrode terminal 330 has a bottom portion 331 and a terminal portion 332 that protrudes from the bottom portion 331 and is exposed through the first terminal hole 311 and the first through hole 321. The lower surface of the bottom portion 331 of the first electrode terminal 330 can be connected to the first electrode tab 111. A portion of the upper surface and side surface of the bottom portion 331 of the first electrode terminal 330 can contact the recessed area 321a formed around the first through hole 321. The terminal portion 332 of the first electrode terminal 330 can be connected to an external device (e.g., a battery protection module).

[0089] The second electrode terminal 340 may include a connection to the second electrode terminal piece 121 (see reference). Figure 2The second electrode terminal 340 has a bottom portion 341 and a terminal portion 342 that protrudes from the bottom portion 341 and is exposed through the second terminal hole 312 and the second through hole 322. The lower surface of the bottom portion 341 of the second electrode terminal 340 can be connected to the second electrode tab 121. A portion of the upper surface and side surface of the bottom portion 341 of the second electrode terminal 340 can contact the recessed area 322a formed around the second through hole 322. The terminal portion 342 of the second electrode terminal 340 can be connected to an external device (e.g., a battery protection module).

[0090] The first electrode terminal 330 may contain at least one of stainless steel (SUS) and nickel. The second electrode terminal 340 may contain aluminum (Al). However, when the first electrode 110 is a positive electrode and the second electrode 120 is a negative electrode, the first electrode terminal 330 may contain aluminum (Al), and the second electrode terminal 340 may contain at least one of stainless steel (e.g., stainless steel or SUS) and nickel (Ni).

[0091] Figure 8 This is a view illustrating a secondary battery further including a first insulating member according to an embodiment of the present disclosure. Hereinafter, focus will be placed on... Figure 2 The differences between the secondary batteries illustrated in the example are described below. Figure 8 The example shown is a secondary battery, and the details are omitted. Figure 2 The description of the configuration corresponding to the secondary battery shown in the example.

[0092] refer to Figure 8 The container 200 and the cover 310 can be welded and connected by incorporating metallic materials. For example, when the electrode assembly 100 is housed inside the container 200 made of metallic material, a short circuit may occur when the first electrode 110 or the second electrode 120 comes into contact with the container 200.

[0093] To prevent this situation, such as Figure 8 As shown, the secondary battery 1 according to one or more embodiments may further include a first insulating member 410 disposed to surround the bottom and side surfaces of the interior of the container 200. The first insulating member 410 may be located between the electrode assembly 100 and the container 200 to insulate the space between the electrode assembly 100 and the container 200.

[0094] Figure 9 This is a view illustrating a secondary battery further including a second insulating member according to an embodiment of the present disclosure. Hereinafter, focus will be placed on... Figure 2 The differences between the secondary batteries illustrated in the example are described below. Figure 9 The example shown is a secondary battery, and the details are omitted. Figure 2The description of the configuration corresponding to the secondary battery shown in the example.

[0095] refer to Figure 9 When the first electrode 110 of the electrode assembly 100 is a negative electrode and the second electrode 120 is a positive electrode, the first electrode 110 may be formed to be longer than the second electrode 120 in the winding axis direction. When the second electrode terminal 121 is bent on one surface of the electrode assembly 100 and connected to the second electrode terminal 340, a short circuit may occur when the first electrode 110, which is longer than the second electrode 120, comes into contact with the second electrode terminal 121.

[0096] To prevent this situation, such as Figure 9 As shown, the secondary battery 1 according to one or more embodiments may further include a second insulating member 420 that insulates the second electrode tab 121. One surface of the bent portion of the second electrode tab 121 may be connected to the second electrode terminal 340, and the other surface of the bent portion of the second electrode tab 121 may be insulated from the first electrode 110 by the second insulating member 420. That is, the second insulating member 420 may be disposed on one surface of the second electrode tab 121 to insulate the space between the second electrode tab 121 and the first electrode 110.

[0097] Figure 10 This is a view illustrating a method for manufacturing a secondary battery according to another embodiment of the present disclosure.

[0098] refer to Figure 10 A method for manufacturing a secondary battery according to one or more embodiments of the present disclosure may include step S100 of forming an electrode assembly including a first electrode, a separator, a second electrode, a first electrode terminal connected to the first electrode, and a second electrode terminal connected to the second electrode; step S200 of forming a cover assembly including a first terminal hole, a second terminal hole, a first electrode terminal exposed to the outside through the first terminal hole, and a second electrode terminal exposed to the outside through the second terminal hole; and step S300 of housing the electrode assembly in a container having an opening. The method for manufacturing a secondary battery may further include step S400 of sealing an opening of the container with the cover assembly while connecting the first electrode terminal to the first electrode terminal and connecting the second electrode terminal to the second electrode terminal. Reference will be made below to... Figures 1 to 7 The specific steps S100 to S400 are described.

[0099] In step S100, an electrode assembly 100 may be formed, comprising a first electrode 110, a diaphragm 130, a second electrode 120, a first electrode terminal 111 connected to the first electrode 110, and a second electrode terminal 121 connected to the second electrode 120. The first electrode 110 may be a negative electrode, and the second electrode 120 may be a positive electrode. Of course, the reverse is also possible. For example, the electrode assembly 100 may be a wound-type electrode assembly 100 formed by inserting a diaphragm 130, which serves as an insulator, between the first electrode 110 and the second electrode 120, followed by winding; however, other examples are also possible.

[0100] In step S200, a cover assembly 300 may be formed, including a first terminal hole 311, a second terminal hole 312, a first electrode terminal 330 exposed to the outside through the first terminal hole 311, and a second electrode terminal 340 exposed to the outside through the second terminal hole 312.

[0101] The cover assembly 300 may include a cover plate 310, a cover insulating layer 320, a first electrode terminal 330, and a second electrode terminal 340.

[0102] The cover plate 310 may include a first terminal hole 311 and a second terminal hole 312, with the first electrode terminal 330 exposed to the outside through the first terminal hole 311 and the second electrode terminal 340 exposed to the outside through the second terminal hole 312.

[0103] The first terminal hole 311 and the second terminal hole 312 may have shapes that are symmetrical to each other. The first terminal hole 311 and the second terminal hole 312 may have shapes that are axially symmetrical to each other.

[0104] The cover plate 310 may further include a bridging portion 313 formed between the first terminal hole 311 and the second terminal hole 312. The bridging portion 313 may be formed in a strip shape. The first terminal hole 311 and the second terminal hole 312 may have shapes that are symmetrical to each other (e.g., mirror images of each other with respect to the bridging portion 313).

[0105] The cover 310 may contain the same material as the container 200. As an example, the cover 310 may contain a polymer material, but any material that is a high-strength, heat-resistant, and chemically resistant non-metallic material can be used. In another embodiment, the cover 310 may contain a metallic material. For example, the metallic material may include stainless steel (SUS), aluminum, aluminum alloys, or nickel-plated steel.

[0106] The cover insulation layer 320 may be disposed on one surface (e.g., the lower surface) of the cover plate 310 to insulate the first electrode terminal 330 and the second electrode terminal 340 from the cover plate 310.

[0107] The cover insulating layer 320 may include a first through hole 321 corresponding to the first terminal hole 311 and a second through hole 322 corresponding to the second terminal hole 312. Stepped recessed regions 321a and 322a may be formed on the lower surface of the cover insulating layer 320 around the first through hole 321 and the second through hole 322, respectively.

[0108] The recessed region 321a formed around the first through hole 321 can be contacted by the bottom portion 331 of the first electrode terminal 330. For example, the bottom portion 331 of the first electrode terminal 330 can be fitted and fixed into the recessed region 321a formed around the first through hole 321. The recessed region 322a formed around the second through hole 322 can contact the bottom portion 341 of the second electrode terminal 340. For example, the bottom portion 341 of the second electrode terminal 340 can be fitted and fixed into the recessed region 322a formed around the second through hole 322.

[0109] Adhesive components can be applied to the recessed regions 321a and 322a so that the bottom portion 331 of the first electrode terminal 330 and the bottom portion 341 of the second electrode terminal 340, which are in contact with the recessed regions 321a and 322a respectively, can be fixed, but other examples are also possible.

[0110] The first electrode terminal 330 can be exposed to the outside through the first terminal hole 311 of the cover plate 310. The first electrode terminal 330 can be spaced apart from the first terminal hole 311 of the cover plate 310 and can not be in contact with the cover plate 310.

[0111] The second electrode terminal 340 can be exposed to the outside through the second terminal hole 312 of the cover plate 310. The second electrode terminal 340 can be spaced apart from the second terminal hole 312 of the cover plate 310 and can not be in contact with the cover plate 310.

[0112] In step S300, the electrode assembly 100 may be housed in a container 200 having an opening. The container 200 may contain the same material as the cover 310. As an example, the container 200 may contain a polymer material, but any material that is a high-strength, heat-resistant, and chemically resistant non-metallic material may be used. In another embodiment, the container 200 may contain a metallic material. For example, the metallic material may include metals such as stainless steel (SUS), aluminum, aluminum alloys, or nickel-plated steel.

[0113] In step S400, the first electrode connector 111 and the first electrode terminal 330 are connected, and the second electrode connector 121 and the second electrode terminal 340 are connected, while the cover assembly 300 seals one opening of the container 200.

[0114] The first electrode connector 111 can be bent on a surface of the electrode assembly 100 facing the cover assembly 300 and connected to the first electrode terminal 330 of the cover assembly 300. The first electrode 110 and the first electrode terminal 330 can be electrically connected through the first electrode connector 111.

[0115] The second electrode connector 121 can be bent on one surface of the electrode assembly 100 facing the cover assembly 300 and connected to the second electrode terminal 340 of the cover assembly 300. The second electrode 120 and the second electrode terminal 340 can be electrically connected through the second electrode connector 121.

[0116] The cap assembly 300 can seal an opening of the container 200. The cap assembly 300 can cover an opening of the container 200 to seal the electrode assembly 100 from the outside.

[0117] The cover plate 310 of the cover assembly 300 can contact and connect with the upper end of the side wall of the container 200. As mentioned above, the cover plate 310 and the container 200 can contain the same material, and depending on the material, the cover plate 310 and the container 200 can be joined by heat fusion or metal bonding.

[0118] As described above, the secondary battery 1 according to one or more embodiments of the present disclosure can prevent short circuits between the first electrode 110 and the second electrode 120 by allowing the first electrode terminal 330 and the second electrode terminal 340 included in the cover assembly 300 to be spaced apart from each other.

[0119] Since the cover assembly 300 includes a first electrode terminal 330 and a second electrode terminal 340, the secondary battery 1 according to some embodiments of the present disclosure can change the material of the container 200 and the cover plate 310 that seals the container 200.

[0120] According to some embodiments of the present disclosure, the secondary battery 1 can be formed using a non-metallic material having high strength, heat resistance and chemical resistance to form the container 200 and the cover plate 310.

[0121] By joining the container 200, made of non-metallic material, and the cover 310 by thermal fusion rather than welding, the secondary battery 1 according to some embodiments of the present disclosure can prevent the risk of damage to the electrode assembly 100 housed inside the container 200 due to welding.

[0122] Coin-type or button-type batteries include a housing for accommodating electrode assemblies having a core shape and a cap assembly attached to the upper part of the housing to seal the electrode assemblies from the outside.

[0123] When evaluating the high temperature and high humidity resistance of button or coin-type batteries, depending on the arrangement of the cover insulation layer, a short circuit may occur between the cover and the terminal block due to moisture, which may pose a safety problem for the battery.

[0124] According to some embodiments of this disclosure, short circuits between the first electrode and the second electrode can be prevented by allowing the first electrode terminal (negative electrode terminal) and the second electrode terminal (positive electrode terminal) included in the cover assembly to be spaced apart from each other.

[0125] According to some embodiments of this disclosure, the cover assembly can change the material of the container and the cover plate that seals the container by including a first electrode terminal and a second electrode terminal.

[0126] According to some embodiments of this disclosure, the container and the cover can be formed from a non-metallic material with high strength, heat resistance and chemical resistance.

[0127] According to some embodiments of this disclosure, non-metallic containers and covers are joined together by thermal fusion rather than welding, thereby preventing the risk of damage to electrode assemblies housed inside the containers due to welding.

[0128] Although this disclosure has been described above with reference to embodiments thereof, it is not limited thereto. Those skilled in the art will be able to make various modifications and variations thereto within the spirit of this disclosure and within the equivalents of the appended claims.

[0129] Exemplary embodiments have been disclosed herein, and although specific terminology has been used, it is used and interpreted in a general and descriptive sense only and is not intended to be limiting. In some cases, as will be apparent to those skilled in the art at the time of filing of this application, 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, unless otherwise specifically indicated. 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 a first electrode, a second electrode, a diaphragm between the first electrode and the second electrode, a first electrode terminal connected to the first electrode, and a second electrode terminal connected to the second electrode. A container for housing the electrode assembly, the container having an opening; and A cap assembly that seals one opening of the receiving container, the cap assembly including a first electrode terminal connected to the first electrode tab and a second electrode terminal connected to the second electrode tab. The cover assembly further includes a cover plate having a first terminal hole and a second terminal hole, wherein the first electrode terminal is exposed to the outside through the first terminal hole and the second electrode terminal is exposed to the outside through the second terminal hole.

2. The secondary battery according to claim 1, wherein: The cover assembly includes a cover insulating layer, the cover insulating layer including a first through hole corresponding to the first terminal hole and a second through hole corresponding to the second terminal hole, and insulating the space between the first electrode terminal and the second electrode terminal and the cover plate; and The first electrode terminal is exposed through the first terminal hole and the first through hole, and the second electrode terminal is exposed through the second terminal hole and the second through hole.

3. The secondary battery according to claim 2, wherein the first electrode terminal and the second electrode terminal are spaced apart from each other.

4. The secondary battery according to claim 2, wherein the first electrode terminal comprises: The bottom part is connected to the first electrode terminal piece; as well as The terminal portion protrudes from the bottom portion and is exposed through the first terminal hole and the first through hole; and The second electrode terminal includes: The bottom part is connected to the second electrode terminal piece; as well as The terminal portion protrudes from the bottom portion of the second electrode terminal and is exposed through the second terminal hole and the second through hole.

5. The secondary battery according to claim 4, wherein: The recessed area with steps around the first through hole and the recessed area with steps around the second through hole are in the cover insulation layer. The bottom portion of the first electrode terminal contacts the recessed area surrounding the first through hole, and The bottom portion of the second electrode terminal contacts the recessed area surrounding the second through hole.

6. The secondary battery according to claim 2, wherein the container and the cover are electrically insulated from the first electrode and the second electrode.

7. The secondary battery according to claim 2, wherein the container and the cover plate comprise the same material.

8. The secondary battery of claim 7, wherein the container and the cover plate comprise a polymer material.

9. The secondary battery according to claim 8, wherein the container and the cover are connected by heat fusion.

10. The secondary battery of claim 7, wherein the container and the cover plate comprise a metallic material.

11. The secondary battery according to claim 10, wherein the container and the cover are connected by a metal connection.

12. The secondary battery of claim 10, further comprising a first insulating member disposed around the bottom and side surfaces of the interior of the receiving can.

13. The secondary battery according to any one of claims 1 to 12, wherein the second electrode tab is bent and connected to the second electrode terminal.

14. The secondary battery according to claim 13, further comprising a second insulating member that insulates the second electrode terminal piece. The first side of the bent portion of the second electrode connector is connected to the second electrode terminal, and The second side of the bent portion of the second electrode terminal is insulated from the first electrode by the second insulating member.

15. The secondary battery according to any one of claims 3 to 12, wherein the first terminal hole and the second terminal hole have symmetrical shapes to each other.

16. The secondary battery according to claim 15, wherein the first terminal hole and the second terminal hole have shapes that are axially symmetrical to each other.

17. The secondary battery according to any one of claims 3 to 12, wherein the cover plate further includes a bridging portion between the first terminal hole and the second terminal hole.

18. The secondary battery according to claim 17, wherein the bridging portion has a strip shape.

19. The secondary battery according to any one of claims 1 to 12, wherein the first electrode terminal comprises at least one of stainless steel and nickel.

20. The secondary battery according to any one of claims 1 to 12, wherein the second electrode terminal comprises aluminum.

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