Secondary battery

Abstract

A secondary battery is provided in which a first electrode (negative) terminal and a second electrode (positive) terminal can be implemented in parallel (e.g., simultaneously) in a cover assembly. The secondary battery includes a housing including a crimped portion and a crimped portion, an electrode assembly physically coupled to the housing and including a first electrode plate and a second electrode plate, the first electrode plate electrically connected to the housing, a first insulating gasket between the crimped portion and the crimped portion, a cover plate coupled between the crimped portion and the crimped portion by the first insulating gasket, a second insulating gasket extending through and coupled to the cover plate, and a riveted terminal extending through and physically coupled to the second insulating gasket, wherein the riveted terminal is electrically connected to the second electrode plate of the electrode assembly.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2021-0179507, filed on December 15, 2021, with the Korean Intellectual Property Office, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to a secondary battery. Background Technology

[0003] Lithium (e.g., lithium-ion) secondary batteries are used as power sources for hybrid or electric vehicles and portable electronic devices due to several features and / or advantages, including, for example, high operating voltage and high energy density per unit weight.

[0004] Secondary batteries can be classified by shape as cylindrical, prismatic, or pouch-shaped. For example, a cylindrical secondary battery typically includes a cylindrical casing, cylindrical electrode assemblies attached to the casing, an electrolyte (optional) injected into the casing to enable the movement of lithium ions, and a cover assembly attached to one side of the casing to prevent or reduce electrolyte leakage and to prevent or reduce separation of the electrode assemblies.

[0005] The information disclosed in this background section is only intended to enhance the understanding of the background technology of this disclosure, and therefore may contain information that does not constitute prior art. Summary of the Invention

[0006] This disclosure provides a secondary battery. One or more aspects of this disclosure relate to a cylindrical secondary battery in which the positive and negative terminals are implemented in parallel (e.g., simultaneously) in a cover assembly.

[0007] Other aspects will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practicing the embodiments presented in this disclosure.

[0008] One or more embodiments of this disclosure include a secondary battery comprising: a housing including a rolled edge and a crimped portion; an electrode assembly physically bonded to the housing and including a first electrode plate and a second electrode plate, the first electrode plate being electrically connected to the housing; a first insulating gasket between the rolled edge and the crimped portion; a cover plate bonded between the rolled edge and the crimped portion by the first insulating gasket; a second insulating gasket penetrating (e.g., extending through) the cover plate and bonded to the cover plate; and a riveting terminal penetrating (e.g., extending through) the second insulating gasket and physically bonded to the second insulating gasket, wherein the riveting terminal is electrically connected to the second electrode plate of the electrode assembly.

[0009] In one or more embodiments, the crimping portion and the cover plate can be connected to each other.

[0010] In one or more embodiments, the outer surface of the crimped portion and the cover plate can be connected to each other by a conductive adhesive.

[0011] In one or more embodiments, the inner surface of the crimped portion and the cover plate can be connected to each other by a conductive adhesive.

[0012] In one or more embodiments, the crimped portion and the cover plate can be connected to each other via a welding area.

[0013] In one or more embodiments, the welding area may be provided on a portion of the crimping portion, or it may be provided on the entire area of ​​the crimping portion.

[0014] In one or more embodiments, the inner insulation element may be on the inner surface of the cover plate.

[0015] In one or more embodiments, the cover plate may include: a cover plate peripheral region, coupled between the rolled edge and the crimped portion; a cover plate inclined region, extending from the cover plate peripheral region and inclined upward; and a cover plate central region, extending from the cover plate inclined region and coupled to the second insulating washer and the riveting terminal.

[0016] In one or more embodiments, the outer surface of the crimping portion and the outer surface of the central region of the cover plate may be coplanar.

[0017] In one or more embodiments, the housing may also include a bottom surface, and the bottom surface may include a safety vent.

[0018] In one or more embodiments, the second electrode plate of the electrode assembly can be electrically connected to the riveting terminal via a second lead connector.

[0019] In one or more embodiments, the first electrode plate of the electrode assembly can be electrically connected to the safety vent via a first lead connector. Attached Figure Description

[0020] Figure 1A This is a perspective view illustrating an example secondary battery according to one or more embodiments of the present disclosure.

[0021] Figure 1B This is a cross-sectional view showing an example secondary battery according to one or more embodiments of the present disclosure.

[0022] Figure 2 This is an enlarged cross-sectional view showing a cover assembly and its structure (e.g., surrounding structure or enclosing structure) in an example secondary battery according to one or more embodiments of the present disclosure.

[0023] Figure 3This is an enlarged cross-sectional view showing a cover assembly and its structure (e.g., surrounding structure or enclosing structure) in an example secondary battery according to one or more embodiments of the present disclosure.

[0024] Figure 4 This is an enlarged cross-sectional view showing a cover assembly and its structure (e.g., surrounding structure or enclosing structure) in an example secondary battery according to one or more embodiments of the present disclosure.

[0025] Figure 5 This is an enlarged cross-sectional view showing a cover assembly and its structure (e.g., surrounding structure or enclosing structure) in an example secondary battery according to one or more embodiments of the present disclosure.

[0026] Figure 6A and Figure 6B This is an enlarged plan view showing a cover assembly and its structure (e.g., surrounding structure or enclosing structure) in an example secondary battery according to one or more embodiments of the present disclosure. Detailed Implementation

[0027] In the following description, one or more embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings.

[0028] Examples of this disclosure are provided to explain it more fully to those skilled in the art, and the examples below may be modified in one or more suitable other forms. However, this disclosure may be implemented in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these exemplary embodiments are provided so that this disclosure will be thorough and complete and will fully convey to those skilled in the art aspects and features of this disclosure. Therefore, processes, elements, and techniques that are not essential for those skilled in the art to fully understand the aspects and features of this disclosure may not be described.

[0029] Additionally, for the sake of brevity and clarity, the dimensions or thicknesses of various components may be exaggerated in the accompanying drawings. The same reference numerals always denote the same elements, and their repeated descriptions may be omitted. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Furthermore, it will be understood that when element A is referred to as "on" element B, "connected to," or "attached to" element B, element A may be directly on, directly connected to, or directly attached to element B, or there may be an intermediary element C (or multiple intermediary elements C) between element A and element B such that element A and element B are indirectly connected to each other. Additionally, it will be understood that when an element or layer is referred to as "between" two elements or layers, the element or layer may be the only element or layer between the two elements or layers, or there may be one or more intermediary elements or layers.

[0030] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are also intended to include the plural forms. It will also be understood that when the terms “comprising,” “including,” and variations thereof are used in this specification, it indicates the presence of the stated features, numbers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, and / or groups thereof.

[0031] It will be understood that although the terms first, second, etc., may be used herein to describe one or more suitable components, elements, regions, layers, and / or portions, these components, elements, regions, layers, and / or portions should not be limited by these terms. These terms are used only to distinguish one component, element, region, layer, and / or portion from another component, element, region, layer, and / or portion. Thus, for example, without departing from the teachings of this disclosure, the first component, first element, first region, first layer, and / or first portion discussed below may be referred to as a second component, second element, second region, second layer, and / or second portion.

[0032] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” may be used herein to describe the relationship between one element or feature as shown in the figure and another element(s). It will be understood that, in addition to covering the orientation depicted in the figure, spatial relative terms are also intended to cover different orientations of the device during use or operation. For example, when an element or feature in the figure is flipped, an element described as “below” or “under” other elements or features will be positioned “above” or “above” other elements or features. Thus, the example term “below” can cover both above and below orientations. The device may be positioned otherwise (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein should be interpreted accordingly.

[0033] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will also be understood that terms (such as those defined in a general dictionary) shall be interpreted as having a meaning consistent with their meaning in the context of the relevant field and / or in this specification, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0034] Figure 1A and Figure 1BThese are perspective and cross-sectional views, respectively, showing an example secondary battery 100 according to one or more embodiments of the present disclosure. Figure 2 This is an enlarged cross-sectional view showing a cover assembly 130 and its structure (e.g., surrounding structure or encircling structure) in an example secondary battery 100 according to one or more embodiments of the present disclosure.

[0035] like Figure 1A , Figure 1B and Figure 2 As shown, an example secondary battery 100 according to one or more embodiments of the present disclosure includes a cylindrical housing 110, a cylindrical electrode assembly 120, and a cover assembly 130. In some embodiments, the example secondary battery 100 may also include a center pin 140 (optional) coupled to the electrode assembly 120.

[0036] The cylindrical housing 110 may include a substantially circular bottom 111 and sidewalls 112 extending upward from the bottom 111 for a set or predetermined length. In some embodiments, the housing 110 may include a can, an outer material, or a shell, or may be referred to as a can, an outer material, or a shell.

[0037] During the manufacturing process of the secondary battery 100, the upper part of the cylindrical housing 110 may be open. Therefore, during the assembly process of the secondary battery 100, the electrode assembly 120 can be integrated into a single structure and inserted into the cylindrical housing 110. Of course, thereafter, electrolyte (optional or suitable) may be additionally injected into the cylindrical housing 110.

[0038] The cylindrical shell 110 may be made of steel, steel alloy, nickel-plated steel, nickel-plated steel alloy, aluminum, or aluminum alloy.

[0039] In one or more embodiments, in the cylindrical housing 110, an inwardly recessed rolled edge 113 may be provided at the bottom of the cover assembly 130, and an inwardly bent crimping portion 114 may be provided on the upper part of the cover assembly 130, such that the cover assembly 130 does not separate to the outside (e.g., such that the cover assembly 130 does not separate from the secondary battery 100 after assembly).

[0040] In one or more embodiments, a safety vent 1111 may be located at the bottom 111 of the cylindrical housing 110. In some embodiments, the safety vent 1111 may be provided in an approximately or substantially annular or C-shaped form. In some embodiments, the safety vent 1111 may include, or be referred to as, a notch, recess, or groove.

[0041] Electrode assembly 120 may be housed within a cylindrical housing 110. Electrode assembly 120 may include, or be referred to as, an electrode, an electrode assembly, or a jelly roll. Electrode assembly 120 may include a negative electrode plate 121 coated with a negative electrode active material (e.g., graphite, carbon, etc.), a positive electrode plate 122 coated with a positive electrode active material (e.g., transition metal oxides (LiCoO2, LiNiO2, LiMn2O4, etc.)), and a separator 123 located between the negative electrode plate 121 and the positive electrode plate 122 to prevent or substantially prevent short circuits and to allow only, or substantially or effectively only, the movement of lithium ions. The negative electrode plate 121, the positive electrode plate 122, and the separator 123 may be wound into a generally cylindrical shape. In some embodiments, the negative electrode plate 121 may include copper (Cu) foil, the positive electrode plate 122 may include aluminum (Al) foil, and the separator 123 may include polyethylene (PE) or polypropylene (PP).

[0042] In one or more embodiments, a negative electrode lead 124 protruding downwards for a predetermined or fixed length can be connected to a negative electrode plate 121, while a positive electrode lead 125 protruding upwards for a predetermined or fixed length can be connected to a positive electrode plate 122, and vice versa. In some embodiments, the negative electrode lead 124 may comprise copper (Cu) or nickel (Ni), and the positive electrode lead 125 may comprise aluminum (Al). In one or more embodiments, the negative electrode lead 124 of the electrode assembly 120 may be soldered to the bottom 111 of the cylindrical housing 110. Therefore, the cylindrical housing 110 can function as a negative electrode. In one or more embodiments, the negative electrode lead 124 may be soldered to a safety vent 1111 provided on the bottom 111 of the cylindrical housing 110. Conversely, the positive electrode lead 125 may be soldered to the bottom 111 of the cylindrical housing 110, and in this case, the cylindrical housing 110 can function as a positive electrode.

[0043] In one or more embodiments, a first insulating plate 126, incorporated into the cylindrical housing 110 and having a first hole 126a formed at its center and a second hole 126b formed at its exterior, may be disposed between the electrode assembly 120 and the bottom 111. In one or more embodiments, the first insulating plate 126 prevents or protects the electrode assembly 120 from electrical contact with the bottom 111 of the cylindrical housing 110. In one or more embodiments, the first insulating plate 126 prevents or protects the positive electrode plate 122 of the electrode assembly 120 from electrical contact with the bottom 111. In one or more embodiments, when a large amount of gas is generated due to an anomaly in the secondary battery, the first hole 126a allows the gas to move rapidly upward through the center pin 140, and the second hole 126b allows the negative electrode lead tab 124 to penetrate (e.g., extend through) and be soldered to the bottom 111.

[0044] In one or more embodiments, a second insulating plate 127, incorporated into a cylindrical housing 110 and having a first hole 127a formed at its center and a plurality of second holes 127b formed at its exterior, can be inserted between the electrode assembly 120 and the cover assembly 130. In one or more embodiments, the second insulating plate 127 prevents or protects the electrode assembly 120 from electrical contact with the cover assembly 130. In one or more embodiments, the second insulating plate 127 prevents or protects the negative electrode plate 121 of the electrode assembly 120 from electrical contact with the cover assembly 130. In one or more embodiments, when a large amount of gas is generated due to an anomaly in the secondary battery, the first hole 127a allows the gas to move rapidly into the cover assembly 130, and the second holes 127b allow the positive electrode lead tab 125 to penetrate (e.g., extend through) and be welded to the riveting terminal 134. In one or more embodiments, the remaining second holes 127b are used to allow electrolyte to flow rapidly into the electrode assembly 120 during an electrolyte injection process.

[0045] In one or more embodiments, the first hole 126a of the first insulating plate 126 and the first hole 127a of the second insulating plate 127 are formed to have a diameter smaller than that of the center pin 140, thereby preventing or substantially preventing the center pin 140 from making electrical contact with the bottom 111 or the cover assembly 130 due to external impact.

[0046] The center pin 140 has a hollow cylindrical shape and can be coupled to the center of the generally electrode assembly 120. The center pin 140 may be formed of steel, stainless steel, aluminum, aluminum alloy or polybutylene terephthalate, but this disclosure is not limited thereto. The center pin 140 is used to suppress or reduce deformation of the electrode assembly 120 during charging and discharging of the battery and serves as a channel for gas generated inside the secondary battery.

[0047] The cover assembly 130 may include a first insulating washer 131, a cover plate 132, a second insulating washer 133, and a riveting terminal 134. In one or more embodiments, the cover assembly 130 may also include an upper insulating member 135, a lower insulating member 136, and an inner insulating member 137. In some embodiments, the cover assembly 130 may include, or be referred to as, a cap, cover, plate, covering, lid, or shield.

[0048] A first insulating washer 131 may be inserted between a rolled edge portion 113 and a crimped portion 114 disposed in the housing 110. In one or more embodiments, the upper end of the first insulating washer 131 may be located between the rolled edge portion 113 and the crimped portion 114, while the lower end of the first insulating washer 131 may be located inside the rolled edge portion 113. In one or more embodiments, the first insulating washer 131 may include an insulating element that does not react with the electrolyte. In some embodiments, the first insulating washer 131 may include polypropylene (PP), polyethylene (PE), ethylene propylene diene monomer (EPDM), or nitrile rubber (NBR). The first insulating washer 131 isolates the interior and exterior of the housing 110 to prevent or substantially prevent the electrolyte contained within the housing from leaking to the exterior and / or foreign matter (e.g., moisture or dust) from entering the interior of the housing.

[0049] A cover plate 132 may be joined between a rolled edge portion 113 and a crimped portion 114 to be secured using a first insulating washer 131 disposed between the rolled edge portion 113 and the crimped portion 114. In one or more embodiments, the cover plate 132 may include a cover plate peripheral region 1321, a cover plate inclined region 1322, and a cover plate central region 1323. The cover plate central region 1323 may include a terminal hole 1324 through which a second insulating washer 133 and a riveting terminal 134 penetrate (e.g., extend through) the terminal hole 1324 for engagement, as discussed in more detail below. In some embodiments, the cover plate 132 may include aluminum, copper, nickel, iron, or alloys thereof. In some embodiments, the cover plate 132 may include, or be referred to as, a cap, top cover, plate, covering, lid, or shield.

[0050] The peripheral region 1321 of the cover plate can be joined between the rolled edge 113 and the crimping portion 114. In one or more embodiments, the side surface and inner surface (lower surface) of the peripheral region 1321 of the cover plate can be in close contact with the first insulating gasket 131, and the outer surface (upper surface) of the peripheral region 1321 of the cover plate can be in close contact with the crimping portion 114. In one or more embodiments, the outer surface of the peripheral region 1321 of the cover plate can be electrically connected to the inner surface of the crimping portion 114. Therefore, the housing 110 and the cover plate 132 can have the same polarity.

[0051] The inclined region 1322 of the cover plate can extend from the outer region 1321 of the cover plate and can be inclined upward. The inclined region 1322 of the cover plate can connect the outer region 1321 of the cover plate and the central region 1323 of the cover plate to each other.

[0052] The central region 1323 of the cover plate may extend from the inclined region 1322 of the cover plate. The central region 1323 of the cover plate may include a substantially flat outer surface (top surface) and a substantially flat inner surface (bottom surface) opposite the outer surface. The terminal hole 1324 may penetrate (e.g., extend through) the central region 1323 of the cover plate. In one or more embodiments, the outer surface of the crimp portion 114 and the outer surface of the central region 1323 of the cover plate may be substantially coplanar.

[0053] The second insulating washer 133 may be coupled to the terminal hole 1324. In one or more embodiments, the second insulating washer 133 may cover the inner wall of the terminal hole 1324, a portion of the outer surface of the central region 1323 of the cover plate, and a portion of the inner surface of the central region 1323 of the cover plate. The material of the second insulating washer 133 may be similar to the material of the first insulating washer 131. The second insulating washer 133 may include, or be referred to as, a sealing washer or sealing insulation.

[0054] The riveting terminal 134 can penetrate (e.g., extend through) the second insulating washer 133 and be engaged with the second insulating washer 133. In other words, the riveting terminal 134 can be engaged through the terminal hole 1324 of the cover plate 132.

[0055] The riveting terminal 134 may include a riveting head portion 1341 positioned on the outer surface of the cover plate 132, a riveting body 1342 positioned inside the terminal hole 1324, and a riveting leg portion 1343 positioned on the inner surface (or adjacent to the inner surface of the cover plate 132). In one or more embodiments, the riveting head portion 1341, the riveting body 1342, and the riveting leg portion 1343 may be integrally formed and may have a substantially T-shaped cross-section. In some embodiments, the riveting terminal 134 may include aluminum, copper, nickel, iron, or alloys thereof.

[0056] As described above, the positive lead connector 125 can be electrically connected to the riveting leg 1343 of the riveting terminal 134. In one or more embodiments, the positive lead connector 125 can be soldered to the riveting leg 1343. Therefore, the riveting terminal 134 can have positive characteristics. In one or more embodiments, the cover plate 132 can be used as the negative terminal, and the riveting terminal 134 can be used as the positive terminal. For example, the cover plate 132 can have negative characteristics by being electrically connected to the crimp portion 114 of the housing 110, and the riveting terminal 134 can have positive characteristics by being electrically connected to the positive lead connector 125. Therefore, in this disclosure, two terminals (positive terminal and negative terminal) are provided in parallel (e.g., simultaneously) in the upper region (or upper portion) of the cylindrical secondary battery 100 (e.g., provided in the upper region (or upper portion) of the cylindrical secondary battery 100).

[0057] The upper insulating member 135 may be disposed between the riveting terminal 134 and the cover plate 132. In one or more embodiments, the upper insulating member 135 may be disposed between the riveting head portion 1341 and the central region 1323 of the cover plate.

[0058] The lower insulating member 136 may be positioned between the riveting body 1342 and / or the riveting leg 1343 and the central region 1323 of the cover plate. In one or more embodiments, the lower insulating member 136 may be positioned between the riveting leg 1343 and the second insulating washer 133 and / or the inner insulating member 137.

[0059] The inner insulating member 137 may be additionally disposed on the inner surface of the cover plate 132. In one or more embodiments, the inner insulating member 137 may be disposed in the central region 1323 of the cover plate. In one or more embodiments, the inner insulating member 137 may be disposed on the inner surface of the central region 1323 of the cover plate. In one or more embodiments, the inner insulating member 137 may be disposed from the terminal hole 1324 disposed in the central region 1323 of the cover plate to the inclined region 1322 of the cover plate.

[0060] In one or more embodiments, the insulating elements 135, 136, and 137 may include insulating elements that do not react with the electrolyte. In one or more embodiments, the insulating elements 135, 136, and 137 may include PP, PE, EPDM, or NBR. In one or more embodiments, the insulating elements 135, 136, and 137 may be provided by coating the cover plate 132 in a liquid state and then curing it, or by providing them separately and then assembling them to the cover plate 132.

[0061] Figure 3 This is an enlarged cross-sectional view showing a cover assembly 130 and its structure (e.g., surrounding or encircling structure) in an example secondary battery 100 according to one or more embodiments of the present disclosure. Figure 3 In the example shown, cover plate 132 and crimp portion 114 can be electrically connected to each other using conductive adhesive 150A. In one or more embodiments, the peripheral region 1321 of the cover plate, the inclined region 1322 of the cover plate, and / or the central region 1323 of the cover plate can be electrically connected to the outer surface of the crimp portion 114 using conductive adhesive 150A. In one or more embodiments, conductive adhesive 150A may comprise silver-filled epoxy resin or solder. In some embodiments, conductive adhesive 150A may comprise a welded area provided by laser welding, resistance welding, and / or arc welding, etc.

[0062] Figure 4 This is an enlarged cross-sectional view showing a cover assembly 130 and its structure (e.g., surrounding or encircling structure) in an example secondary battery 100 according to one or more embodiments of the present disclosure. Figure 4In the example shown, the cover plate 132 and the crimp portion 114 can be electrically connected to each other using a conductive adhesive 150B. In one or more embodiments, the peripheral region 1321 of the cover plate can be electrically connected to the inner surface of the crimp portion 114 using the conductive adhesive 150B. In some embodiments, the conductive adhesive 150B may comprise silver-filled epoxy resin or solder. In some embodiments, the conductive adhesive 150B may comprise a welded area provided by laser welding, resistance welding, and / or arc welding, etc.

[0063] Figure 5 This is an enlarged cross-sectional view showing a cover assembly 130 and its structure (e.g., surrounding or encircling structure) in an example secondary battery 100 according to one or more embodiments of the present disclosure. Figure 5 In the example shown, the crimp portion 114 and the cover plate 132 can be electrically connected to each other via a welding area 150C. In one or more embodiments, the welding area 150C can be provided by a laser beam. In one or more embodiments, when the laser beam irradiates the outer surface (upper surface) of the crimp portion 114, a portion of the crimp portion 114 and a portion of the peripheral area 1321 of the cover plate are melted and then cooled to provide the welding area 150C, and the crimp portion 114 and the peripheral area 1321 of the cover plate can be electrically, mechanically, and / or physically connected to each other via the welding area 150C.

[0064] Figure 6A and Figure 6B This is an enlarged plan view showing a cover assembly 130 and its structure (e.g., surrounding structure or encircling structure) in an example secondary battery 100 according to one or more embodiments of the present disclosure.

[0065] like Figure 6A As shown, the welding areas 150C provided by the laser beam can be arranged at approximately 90° intervals at four portions on the outer surface of the crimping portion 114. In one or more embodiments, at each portion, the welding areas 150C can be arranged in the form of two lines. In one or more embodiments, each welding area 150C can be arranged in the form of an arc.

[0066] like Figure 6B As shown, the welding area 150C provided by the laser beam can be arranged in a ring on the entire outer surface of the crimping portion 114. In one or more embodiments, the welding area 150C can be arranged in the form of two rings.

[0067] As described above, this disclosure provides a cylindrical secondary battery in which the negative and positive terminals are implemented in parallel (e.g., simultaneously) in a cover assembly.

[0068] The terms “substantially,” “approximately,” and similar terms as used herein are used as approximate terms rather than terms of degree, and are intended to take into account the inherent biases of measured or calculated values ​​that would be recognized by one of ordinary skill in the art. As used herein, “substantially” includes the stated value and means within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art, taking into account the measurement in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system). For example, “substantially” can mean within one or more standard deviations, or within ±30%, ±20%, ±10%, ±5% of the stated value.

[0069] Furthermore, the use of "may" in describing embodiments of this disclosure means "one or more embodiments of this disclosure".

[0070] In this specification, unless otherwise stated, when the component is spherical or circular, “diameter” refers to the spherical or circular diameter of the component, and when the component is non-spherical or non-circular, “diameter” refers to the length of the major axis of the component.

[0071] While the foregoing embodiments for implementing example secondary batteries according to this disclosure have been shown, this disclosure is not limited to the illustrated embodiments. Those skilled in the art will understand that one or more suitable changes in form and detail may be made to the described embodiments without departing from the spirit and scope of this disclosure as defined by the appended claims and their equivalents.

Claims

1. A secondary battery, the secondary battery comprising: The housing includes a rolled edge and a crimped part; An electrode assembly is physically bonded to the housing and includes a first electrode plate and a second electrode plate, the first electrode plate being electrically connected to the housing; A first insulating washer is located between the rolled edge portion and the crimped portion; The cover plate is joined between the rolled edge portion and the crimped portion by the first insulating washer; A second insulating washer extends through and is attached to the cover plate; and The riveted terminal extends through the second insulating washer and is physically bonded to the second insulating washer. The riveting terminal is electrically connected to the second electrode plate of the electrode assembly. The cover plate includes: a peripheral region, which is joined between the rolled edge and the crimped portion; an inclined region extending from the peripheral region and inclined upwards; and a central region extending from the inclined region and joined to the second insulating washer and the riveting terminal. The central region of the cover plate includes a flat outer surface and a flat inner surface opposite to the outer surface. Wherein, the outer surface of the pressing part and the outer surface of the central region of the cover plate are coplanar, and The pressing part and the cover plate are electrically connected to each other.

2. The secondary battery according to claim 1, wherein, The outer surface of the crimping part and the cover plate are connected to each other by a conductive adhesive.

3. The secondary battery according to claim 1, wherein, The inner surface of the crimping part and the cover plate are connected to each other by a conductive adhesive.

4. The secondary battery according to claim 1, wherein, The crimping portion and the cover plate are connected to each other via a welding area.

5. The secondary battery according to claim 4, wherein, The welding area is located on a portion of the crimping part or on the entire area of ​​the crimping part.

6. The secondary battery according to claim 1, wherein, The inner insulation element is located on the inner surface of the cover plate.

7. The secondary battery according to claim 1, wherein, The housing also includes a bottom surface, and the bottom surface includes a safety vent.

8. The secondary battery according to claim 1, wherein, The second electrode plate of the electrode assembly is electrically connected to the riveting terminal via a second lead connector.

9. The secondary battery according to claim 7, wherein, The first electrode plate of the electrode assembly is electrically connected to the safety vent via a first lead connector.

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