Secondary battery and battery pack

Abstract

A secondary battery and a battery pack are disclosed. The secondary battery includes: an electrode assembly including an electrode tab; a case in which the electrode assembly is accommodated; a connection member electrically connected to the electrode tab; a side terminal electrically connected to the connection member; a cover plate coupled to the opening of the housing, the side terminal passing through the cover plate; and an insulating portion that insulates the cap plate from the side terminal and insulates the cap plate from the electrode assembly. According to an aspect of an embodiment of the present invention, a secondary battery and a battery pack are provided in which a cap plate and an insulating portion for insulating an electrode assembly are integrated as a whole to omit an unnecessary or undesired process, simplify an assembly process, and improve insulation reliability.

Description

Technical Field

[0001] The embodiments of this disclosure relate to secondary batteries and battery packs. Background Technology

[0002] Generally speaking, with the rapid supply of battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for secondary batteries with high energy density and high capacity has recently increased dramatically. Accordingly, research and development to improve the performance of lithium secondary batteries are actively underway.

[0003] A lithium secondary battery is a battery that includes a positive electrode, a negative electrode, and an electrolyte. The positive and negative electrodes contain active materials that can insert and extract lithium ions. The lithium secondary battery generates electrical energy through oxidation and reduction reactions when lithium ions are inserted / extracted at the positive and negative electrodes.

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

[0005] According to an embodiment of the present invention, a secondary battery and a battery pack are provided, wherein a cover plate and an insulating portion for insulating the electrode assembly are integrated as a whole to omit unnecessary or undesirable processes, simplify the assembly process, and improve insulation reliability.

[0006] The above and other aspects and features of this disclosure will be described in the following description of some embodiments of this disclosure, or will become apparent from the following description of some embodiments of this disclosure.

[0007] According to one or more embodiments of the present invention, a secondary battery includes: an electrode assembly including electrode terminals; a housing in which the electrode assembly is housed; a connecting member electrically connected to the electrode terminals; a side terminal electrically connected to the connecting member; a cover plate coupled to an opening in the housing, through which the side terminal passes; and an insulating portion insulating the cover plate from the side terminal and from the electrode assembly.

[0008] Side terminals may include: boss terminals, which pass through the cover and are located on the connecting member; and external terminals, which are located outside the cover and are welded to the boss terminals.

[0009] The insulating portion may include: a first insulator that insulates the cover plate from the side terminals; and a second insulator that insulates the cover plate from the electrode assembly.

[0010] The first insulator may include: a first plate between the outer terminal and the cover plate; a second plate between the cover plate and the connecting member; and a connecting portion connecting the first plate and the second plate and surrounding the boss terminal.

[0011] The first insulator can be inserted into the cover plate.

[0012] An anti-movement part configured to prevent movement of the first insulator may be located on the cover plate.

[0013] The anti-movement part may include: a connecting hole through the cover plate to connect the first plate and the second plate to each other; a first mounting groove in the upper surface of the cover plate to place the first plate in the first mounting groove; and a second mounting groove in the lower surface of the cover plate to accommodate a portion of the second plate in the second mounting groove.

[0014] The first and second insulators can be provided integrally via a connecting part.

[0015] The connection may include: a connecting post protruding downward from the first insulator; and a connecting hole in the second insulator such that the connecting post is connected to the connecting hole.

[0016] The connecting posts can be connected to the connecting holes using a thermal stacking method.

[0017] The connecting post can have a length greater than the length of the connecting hole.

[0018] The secondary battery may include a connection reinforcement configured to strengthen the connection between the connection hole and the connection post.

[0019] The connecting reinforcement may include at least one stepped surface on the inner surface of the connecting hole.

[0020] The connecting reinforcement may include a tapered surface on the inner surface of the connecting hole.

[0021] The connecting reinforcement may include a non-uniform surface located on the inner surface of the connecting hole.

[0022] The connecting hole may have a diameter larger than that of the connecting post, and the connecting reinforcement may include multiple ribs protruding from the inner surface of the connecting hole toward the connecting post.

[0023] Side terminals, cover plates, and insulation can be modularized into a single component.

[0024] The insulating portion may include: a first insulator that insulates the cover plate from the side terminals; and a second insulator that insulates the cover plate from the electrode assembly, wherein the first insulator may be integrally integrated with the cover plate by insert injection.

[0025] The first and second insulators can be integrated into a whole by thermal stacking.

[0026] According to one or more embodiments of the present invention, the battery pack includes a housing and one or more secondary batteries located within the housing. Attached Figure Description

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

[0028] Figure 1 This is a schematic perspective view illustrating the structure of a battery pack according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic perspective view illustrating the structure of a secondary battery according to an embodiment of the present invention;

[0030] Figure 3 This is a schematic exploded perspective view illustrating the structure of a secondary battery according to an embodiment of the present invention;

[0031] Figure 4 It is along Figure 2 A cross-sectional view of line AA;

[0032] Figure 5 This is a schematic diagram illustrating the structure of an electrode assembly according to an embodiment of the present invention;

[0033] Figure 6 This is a schematic diagram illustrating the structure of the positive terminal piece of an electrode assembly according to an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram illustrating the structure of the negative terminal piece of the electrode assembly according to an embodiment of the present invention;

[0035] Figure 8 This is a schematic perspective view illustrating the structure of some components of a secondary battery according to an embodiment of the present invention;

[0036] Figure 9 This is a schematic exploded perspective view illustrating the structure of components of a secondary battery according to an embodiment of the present invention;

[0037] Figure 10 This is a schematic exploded perspective view illustrating the structure of components of a secondary battery according to an embodiment of the present invention from another perspective;

[0038] Figure 11 It is along Figure 8 A cross-sectional view of line BB;

[0039] Figure 12 This is a schematic cross-sectional view illustrating the connection state of the connecting portion according to an embodiment of the present invention;

[0040] Figure 13 This is a cross-sectional view illustrating the state in which the connecting parts are connected by a thermal stacking method according to an embodiment of the present invention;

[0041] Figure 14 This is a schematic cross-sectional view illustrating the connection reinforcement portion of a secondary battery according to an embodiment of the present invention;

[0042] Figures 15 to 17 This is a cross-sectional view illustrating a modified example of the connection reinforcement of a secondary battery according to some embodiments of the present invention; and

[0043] Figure 18 This is a schematic diagram illustrating the assembly process of a secondary battery according to an embodiment of the present invention. Detailed Implementation

[0044] In this document, some embodiments of the present disclosure will be described in further 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 common or dictionary meanings, but should be interpreted as having meanings and concepts 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.

[0045] The embodiments described in this specification and the configurations shown in the accompanying drawings are provided as some exemplary embodiments of this disclosure and do not necessarily represent all technical ideas, aspects, and features of this disclosure. Accordingly, it should be understood that various equivalents and modifications may exist to replace or modify the embodiments described herein at the time of filing this application.

[0046] It should be understood that when an element or layer is referred to as being "on," "connected to," or "linked to" another element or layer, the element or layer may 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," "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 may be directly linked to or connected to the second element, or the first element may be indirectly linked to or connected to the second element via one or more intermediary elements.

[0047] In the accompanying drawings, the dimensions of various elements, layers, etc., may be exaggerated for clarity of illustration. The same reference numerals indicate the same or similar 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." When following a list of elements, expressions such as "at least one of" and "any one of" modify the entire list of elements and do not modify individual elements in the list. When phrases such as "at least one of A, B, and C," "at least one of A, B, or C," "at least one selected from the group of A, B, and C," or "at least one selected from A, B, and C" are used to indicate a list of elements A, B, and C, the phrase may refer to any and all suitable combinations or subsets of A, B, and C, such as A, B, C, A and B, A and C, B and C, or A and B and C. As used herein, the term "use" may be considered synonymous with the term "utilize." As used herein, the terms “substantially,” “about,” and similar terms are used as approximate terms and not as terms of degree, and are intended to take into account the inherent biases of measurements or calculations that would be recognized by one of ordinary skill in the art.

[0048] It should be understood that although the terms "first," "second," "third," etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, the first element, component, region, layer, or portion discussed below may be referred to as the second element, component, region, layer, or portion without departing from the teachings of the exemplary embodiments.

[0049] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” and “above” may be used herein to describe the relationship of one element or feature to another(s) element or feature as shown in the accompanying drawings. It should be understood that, in addition to the orientations depicted in the drawings, spatial relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as “below” or “under” other elements or features will be oriented as “above” or “above” other elements or features. Thus, the term “below” can encompass both above and below orientations. The device may be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relative descriptive terms used herein should be interpreted accordingly.

[0050] 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 should be further understood that, when used in this specification, the terms “comprising” and / or “including” indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof.

[0051] Furthermore, any numerical range disclosed and / or enumerated herein is intended to include all subranges with the same numerical precision contained within the enumerated range. For example, the range “1.0 to 10.0” is intended to include all subranges between (and including) the enumerated minimum value of 1.0 and the enumerated maximum value of 10.0, i.e., a minimum value equal to or greater than 1.0 and a maximum value equal to or less than 10.0, such as 2.4 to 7.6. Any maximum numerical limit enumerated herein is intended to include all lower numerical limits contained therein, and any minimum numerical limit enumerated in this specification is intended to include all higher numerical limits contained therein. Accordingly, the applicant reserves the right to amend this specification, including the claims, to expressly enumerate any subranges contained within the scope expressly enumerated herein.

[0052] Referring to two compared elements, features, etc., as “identical” may mean that they are identical or substantially identical. Therefore, the phrase “identical” or “substantially identical” can include cases with a deviation considered low in the art (e.g., 5% or less). Furthermore, when a parameter is said to be consistent in a given region, it may mean that it is consistent in terms of the mean.

[0053] Throughout this specification, each element may be singular or plural unless otherwise stated.

[0054] When any element is described as being "above (or below)" or "on (or under)" a component, it may mean that the element is positioned to contact the upper (or lower) surface of the component, or it may mean that another component may be located between the component and any element that is being positioned (or below) the component.

[0055] Furthermore, it should be understood that when a component is referred to as "connected," "linked," or "attached" to another component, these components may be directly "connected," "linked," or "attached" to each other, or one or more intermediary components may exist between them, through which the component may be "connected," "linked," or "attached" to the other component. Furthermore, when a part is referred to as "electrically connected" to another part, the part may be directly electrically connected to the other part, or one or more intermediary components may exist between them, allowing the part to be indirectly electrically connected to the other part.

[0056] Throughout this specification, when “A and / or B” is stated, it means A, B, or A and B, unless otherwise specified. In other words, “and / or” includes any or all of the listed items. When “C to D” is stated, it means C and below D, unless otherwise specified.

[0057] Figure 1 This is a schematic perspective view illustrating the structure of a battery pack according to an embodiment of the present invention.

[0058] refer to Figure 1 According to the current embodiment, the battery pack 1 may include a housing 10 and a secondary battery 2.

[0059] The housing 10 can generally form the exterior of the battery pack 1 and can provide space therein where the secondary battery 2 can be housed.

[0060] The housing 10 according to the current embodiment may include a housing body 11 and a cover 12.

[0061] The outer casing 11 can be formed into a hollow box shape with an open side. However, the cross-section of the outer casing 11 is not limited to the following. Figure 1 The quadrilateral shape shown can be modified to any shape, such as other polygonal shapes, circular shapes, and elliptical shapes.

[0062] The cover 12 can be attached to the housing body 11 and can close the interior space of the housing body 11. As an example, the cover 12 can be formed in a generally plate shape and can be positioned facing the open side of the housing body 11. The cover 12 can be secured to the housing body 11 by any of a variety of connection methods such as bolting, welding, and mating connection methods.

[0063] The secondary battery 2 can be a unit structure used to store and supply power in the battery pack 1.

[0064] The secondary battery 2 can be disposed within the housing 10. Multiple secondary batteries 2 can be provided. The multiple secondary batteries 2 can be arranged in the longitudinal direction of the housing 10 (based on...). Figure 1 The +X axis direction) and the width direction of the outer casing 10 (based on) Figure 2 At least one of the (+Y axis direction) is set to two or more rows. Figure 1 The diagram shows an example in which multiple secondary batteries 2 are arranged in twelve rows along the longitudinal direction of the housing 10. However, the arrangement of the multiple secondary batteries 2 is not limited to this, and its design can be changed in various ways. The multiple secondary batteries 2 can be arranged parallel to each other. The number of secondary batteries 2 can be varied depending on the size and shape of the housing 10, etc.

[0065] Multiple secondary batteries 2 can be electrically connected to each other. As an example, adjacent secondary batteries 2 can be connected in series or in parallel via busbars. The busbars can be formed of a material through which current can flow (e.g., copper, aluminum, or nickel). The specific shape of the busbars can be designed to be any of various shapes that can electrically connect adjacent secondary batteries 2.

[0066] Figure 2 This is a schematic perspective view illustrating the structure of a secondary battery according to an embodiment of the present invention; and Figure 3 This is a schematic exploded perspective view illustrating the structure of a secondary battery according to an embodiment of the present invention. Figure 4 It is along Figure 2 The cross-sectional view of line AA; and Figure 5 This is a schematic diagram illustrating the structure of an electrode assembly according to an embodiment of the present invention. Figure 6 This is a schematic diagram illustrating the structure of the positive terminal piece of an electrode assembly according to an embodiment of the present invention. Figure 7 This is a schematic diagram illustrating the structure of the negative terminal piece of an electrode assembly according to an embodiment of the present invention.

[0067] The first direction described below can be based on Figure 2 and Figure 3 The -X axis direction, the second direction can be based on Figure 2 and Figure 3 The +Y axis direction, and the third direction can be based on Figure 2 and Figure 3 The -Z axis direction.

[0068] This document will describe examples of secondary batteries that are angular or polygonal lithium-ion secondary batteries. However, the invention is not limited thereto, and, for example, the secondary battery may be a lithium polymer battery or a cylindrical battery.

[0069] refer to Figures 2 to 7 The secondary battery 2 according to the current embodiment may include an electrode assembly 200, a housing 100, a connecting member 300, a side terminal 400, a cover plate 450, and an insulating part 500.

[0070] The electrode assembly 200 may include an electrode plate 201 and an electrode terminal block 202. The electrode plate 201 may include a positive electrode plate 210 and a negative electrode plate 220, and the electrode terminal block 202 may include a positive terminal block 240 and a negative terminal block 250.

[0071] The positive plate 210 can be used as the positive electrode of the electrode assembly 200.

[0072] According to the current embodiment, the positive electrode plate 210 can be formed in the shape of a foil comprising a metallic material such as aluminum or an aluminum alloy. The two surfaces or opposing surfaces of the positive electrode plate 210 can be arranged perpendicular to the first direction. The type, size, and shape of the positive electrode plate 210 are not particularly limited, as long as the metallic material does not cause chemical changes in the secondary battery 2 and is conductive. Figure 5 Any shape other than the rectangular shape shown.

[0073] The positive electrode plate 210 can be provided as a plurality of positive electrode plates 210. The plurality of positive electrode plates 210 can be disposed between the front portion 112 and the rear portion 113 of the housing 100 in a first direction. The number of positive electrode plates 210 can be designed to vary depending on the charging capacity of the secondary battery 2, etc.

[0074] The positive electrode plate 210 may include a first active material layer 211 and a first uncoated portion 212.

[0075] The first active material layer 211 can be provided as being applied to at least a portion of the positive electrode plate 210. In an embodiment, the first active material layer 211 can be applied to each of the two surfaces or opposing surfaces of the positive electrode plate 210. However, the first active material layer 211 can be applied to only one surface of the positive electrode plate 210.

[0076] In the current embodiment, since the positive electrode plate 210 is used as the positive electrode, the first active material layer 211 may include the positive electrode active material.

[0077] The positive electrode active material can be a reversible lithium intercalation and deintercalation compound (lithiation intercalation compound). In the embodiments, one or more composite oxides of a metal selected from the group consisting of cobalt, manganese, nickel, iron and combinations thereof with lithium can be used as the positive electrode active material.

[0078] As an example, positive electrode active materials may include lithium iron phosphate oxide (LiFePO4, LFP), lithium iron manganese phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi). x Co y Mn zat least one of O2, NCM). Here, 0 < x < 1, 0 < y < 1, 0 < z < 1, and x + y + z = 1. The positive electrode active material may include lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM), or may include lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM) any two or all of them.

[0079] The first active material layer 211 may further include a positive electrode conductive material.

[0080] The positive electrode conductive material is used to provide conductivity to the first active material layer 211, and any suitable material can be used as the positive electrode conductive material as long as the material does not cause a chemical change in the first active material layer 211 and is a conductive material. Examples of the positive electrode conductive material may be carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, and carbon nanotube, metal-based materials in the form of metal powders or metal fibers including copper, nickel, aluminum, and silver, conductive polymers such as polyphenylene derivatives, or mixtures thereof.

[0081] The first active material layer 211 may further include a positive electrode binder.

[0082] The positive electrode binder can easily adhere the particles constituting the positive electrode active material and can adhere the positive electrode active material to the positive electrode plate 210.

[0083] Examples of the positive electrode binder that can be used are non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0084] The non-aqueous binder may be polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, or combinations thereof.

[0085] Waterborne adhesives may be selected from the group consisting of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0086] If an aqueous binder is used as the positive electrode binder, the first active material layer 211 may further comprise a cellulose compound providing adhesion. One or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be mixed and used as the cellulose compound. Na, K, or Li may be used as the alkali metal.

[0087] Dry adhesives are fibrous polymer materials and may be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0088] The positive electrode plate 210 may include a first uncoated portion 212 thereon, on which the first active material layer 211 is not coated. According to the present embodiment, the first uncoated portion 212 may be disposed in a region at the end of the positive electrode plate 210 that is configured to face the opening 118 of the housing 100. However, the form of the first uncoated portion 212 is not limited thereto, and in embodiments, the first uncoated portion 212 may be formed along the entire edge region of the positive electrode plate 210.

[0089] The negative electrode plate 220 can be used as the negative electrode of the electrode assembly 200.

[0090] According to the current embodiment, the negative electrode plate 220 can be formed in the shape of a foil comprising a metallic material such as copper, copper alloy, nickel, or nickel alloy. The two surfaces or opposing surfaces of the negative electrode plate 220 can be arranged perpendicular to the first direction. The type, size, and shape of the negative electrode plate 220 are not particularly limited, as long as the metallic material does not cause chemical changes in the secondary battery 2 and is conductive. Figure 5 Any shape other than the rectangular shape shown.

[0091] The negative electrode plate 220 can be provided as a plurality of negative electrode plates 220. The plurality of negative electrode plates 220 can be disposed between the front portion 112 and the rear portion 113 of the housing 100 in a first direction. The plurality of positive electrode plates 210 and the plurality of negative electrode plates 220 can be disposed alternately in the first direction. The positive electrode plates 210 and the negative electrode plates 220 can be spaced apart from each other by a distance (e.g., a predetermined distance) in the first direction.

[0092] The negative electrode plate 220 can be arranged to face the positive electrode plate 210 in a first direction.

[0093] The negative electrode plate 220 can include a second active material layer 221 and a second non-coated portion 222.

[0094] The second active material layer 221 can be provided to be coated on at least a part of the negative electrode plate 220. In an embodiment, the second active material layer 221 can be coated on each of two surfaces or opposite surfaces of the negative electrode plate 220. However, the second active material layer 221 can be coated on only one surface of the negative electrode plate 220.

[0095] In an embodiment, the negative electrode plate 220 serves as a negative electrode, and the second active material layer 221 can include a negative electrode active material.

[0096] The negative electrode active material can include a material into which lithium ions can be reversibly embedded and / or from which lithium ions can be reversibly extracted, lithium metal, a lithium metal alloy, a material that can be doped and undoped with lithium, or a transition metal oxide.

[0097] The material into which lithium ions can be reversibly embedded and / or from which lithium ions can be reversibly extracted can include carbon-based negative electrode active materials such as crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon can be graphite such as natural graphite or artificial graphite in the form of amorphous, flaky, spherical, or fibrous, and examples of amorphous carbon can be soft carbon or hard carbon, mesophase pitch carbide, or sintered coke, etc.

[0098] An alloy of lithium and a metal selected from the group consisting of Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn can be used as the lithium metal alloy.

[0099] Si-based negative electrode active materials or Sn-based negative electrode active materials can be used as materials that can be doped and undoped with lithium. The Si-based negative electrode active material can be silicon, a silicon-carbon composite, SiO x (0 < x < 2), a Si-Q alloy (Q is selected from the group consisting of alkali metals, alkaline earth metals, group 13 elements, group 14 elements (excluding Si), group 15 elements, group 16 elements, transition metals, rare earth elements, and combinations thereof), or a combination thereof. The Sn-based negative electrode active material can be Sn, SnO2, a Sn-based alloy, or a combination thereof.

[0100] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to embodiments, the silicon-carbon composite can have amorphous carbon coated on the surface of silicon particles. For example, the silicon-carbon composite can include secondary particles (cores) in which primary silicon particles are aggregated, and an amorphous carbon coating (shell) located on the surface of the secondary particles. The amorphous carbon can also be located between the primary silicon particles, such that, for example, the primary silicon particles can be coated with amorphous carbon. The secondary particles can be dispersed within an amorphous carbon matrix.

[0101] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles, and an amorphous carbon coating on the surface of the core.

[0102] Si-based or Sn-based anode active materials can be mixed and used with carbon-based anode active materials.

[0103] The second active material layer 221 may further include a negative electrode conductive material and a negative electrode binder.

[0104] The negative electrode conductive material provides conductivity to the second active material layer 221, and any suitable material can be used as the negative electrode conductive material, provided that the material does not cause a chemical change in the second active material layer 221 and is a conductive material. Examples of negative electrode conductive materials may be carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers and carbon nanotubes; metallic materials in the form of metal powders or metal fibers containing copper, nickel, aluminum and silver, conductive polymers such as polyphenylene derivatives, or mixtures thereof.

[0105] The negative electrode binder can easily adhere the particles constituting the negative electrode active material and can adhere the negative electrode active material to the negative electrode plate 220.

[0106] Examples of non-aqueous adhesives, aqueous adhesives, dry adhesives, or combinations thereof that can be used as negative electrode adhesives.

[0107] Non-aqueous adhesives may be polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, or combinations thereof.

[0108] Waterborne adhesives may be selected from the group consisting of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluororubber, polyethylene oxide, polyvinylpyrrolidone, polyepoxychloropropane, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0109] If an aqueous binder is used as the negative electrode binder, the second active material layer 221 may further comprise a cellulose compound providing adhesion. One or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be mixed and used as the cellulose compound. Na, K, or Li may be used as the alkali metal.

[0110] Dry adhesives are fibrous polymer materials and may be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0111] The negative electrode plate 220 may include a second uncoated portion 222 thereon, on which the second active material layer 221 is not coated. In an embodiment, the second uncoated portion 222 may be formed along the entire edge region of the negative electrode plate 220.

[0112] The separator 230 can be disposed between the positive electrode plate 210 and the negative electrode plate 220. The separator 230 allows lithium ions to move between the positive electrode plate 210 and the negative electrode plate 220 and can prevent or substantially prevent short circuits between the positive electrode plate 210 and the negative electrode plate 220.

[0113] In an embodiment, the separation membrane 230 may be configured to surround (e.g., encircle) the entire surface area of ​​the electrode assembly 200. Accordingly, the separation membrane 230 may prevent or substantially prevent the positive electrode plate 210 and the negative electrode plate 220 from being directly exposed to the outside of the electrode assembly 200.

[0114] In the embodiments, polyethylene, polypropylene, polyvinylidene fluoride, or a multilayer membrane of two or more layers thereof can be used as the separation membrane 230, and a mixed multilayer membrane (e.g., any one of a two-layer membrane of polyethylene / polypropylene, a three-layer membrane of polyethylene / polypropylene / polypropylene, and a three-layer membrane of polypropylene / polypropylene / polypropylene) can be used as the separation membrane 230.

[0115] The separation membrane 230 may include a porous substrate and a coating located on one or both surfaces of the porous substrate and comprising organic materials, inorganic materials or combinations thereof.

[0116] The porous matrix can be any polymer selected from the group consisting of polyolefins (e.g., polyethylene and polypropylene), polyesters (e.g., polyethylene terephthalate and polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyetherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon), or a polymer film formed from two or more of their copolymers or mixtures.

[0117] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0118] Inorganic materials may include, but are not limited to, inorganic particles selected from the group consisting of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0119] Organic and inorganic materials can be mixed and exist in the coating, or they can exist in the form of a coating containing organic materials and a coating containing inorganic materials stacked together.

[0120] The positive terminal 240 can be connected to the positive plate 210. The positive terminal 240 can provide an electrical connection between the positive plate 210 and the connecting member 300, as will be described below.

[0121] The positive terminal piece 240 can be provided as a plurality of positive terminal pieces 240. Each positive terminal piece 240 can extend from a different positive plate 210 in a second direction. The plurality of positive terminal pieces 240 can be stacked in a first direction.

[0122] The positive terminal piece 240 can be bent in a first direction. That is, the end of the positive terminal piece 240 can be bent in a first direction. Accordingly, the positive terminal piece 240 can increase the contact surface with the sub-plate 310 of the connecting member 300, as will be described below. The positive terminal piece 240 can be bent in the housing 100 in a direction from the front portion 112 to the rear portion 113 or in a direction from the rear portion 113 to the front portion 112.

[0123] When the positive electrode terminal 240 is bent in the first direction, the sum of the thicknesses of the plurality of positive electrode terminals 24 stacked in the first direction can be greater than the thickness of the electrode assembly 200 in the first direction. For example... Figure 6 As shown, the ends of some of the positive electrode tabs 240 that are located relatively close to the rear portion 113 among the plurality of positive electrode tabs 240 stacked in the first direction can protrude from the electrode assembly 200 toward the rear portion 113.

[0124] The negative terminal 250 can be connected to the negative plate 220. The negative terminal 250 can provide an electrical connection between the negative plate 220 and the connecting member 300, as will be described below.

[0125] The negative terminal 250 can be provided as a plurality of negative terminal 250s. Each negative terminal 250 can extend from a different negative plate 220 in a direction opposite to the second direction. The plurality of negative terminal 250s can be stacked in the first direction.

[0126] The negative terminal piece 250 can be bent in a direction opposite to the first direction. That is, the end of the negative terminal piece 250 can be bent in a direction opposite to the first direction. Accordingly, the negative terminal piece 250 can increase the contact surface with the sub-plate 310 of the connecting member 300, as will be described below. The negative terminal piece 250 can be bent in the housing 100 in a direction from the rear portion 113 toward the front portion 112 or in a direction from the front portion 112 toward the rear portion 113.

[0127] When the negative electrode contact 250 is bent in a direction opposite to the first direction, the sum of the thicknesses of the plurality of negative electrode contact 150s stacked in the first direction can be greater than the thickness of the electrode assembly 200 in the first direction. For example... Figure 7 As shown, the ends of some of the negative electrode terminals 250 that are relatively close to the front portion 112 among the plurality of negative electrode terminals 250 stacked in the first direction can protrude from the electrode assembly 200 toward the front portion 112.

[0128] The housing 100 according to the current embodiment may include a bottom portion 111, a front portion 112, a rear portion 113, a top portion 117, and an opening 118. In the embodiment, the housing 100 may be formed in a rectangular shape, the opening 118 may be formed on both sides of the housing 100, and the housing 100 may be formed in a hollow shape.

[0129] The top portion 117 can form the shell 100 (based on) Figure 3 The top portion 117, according to an embodiment, may have a rectangular plate shape. The top portion 117 may be configured to face the bottom portion 111 in a third-party direction. The top portion 117 may be configured to be spaced apart from the bottom portion 111 by a distance (e.g., a predetermined distance) in a direction opposite to the third-party direction.

[0130] The electrode terminals 202 of the electrode assembly 200 can be configured to face the corresponding opening 118.

[0131] The housing 100 according to the embodiment may further include an exhaust port 120 and an exhaust element 130.

[0132] According to the embodiment, the vent 120 can be formed as a hole that extends vertically through the top portion 117 in a third-order upward direction. The vent 120 provides a channel for discharging flames, gases, and smoke generated in the housing 100 to the outside of the housing 100 in the event of thermal runaway of the secondary battery 2 due to overcurrent or the like. However, the cross-sectional design of the vent 120 can be any shape of various shapes, such as elliptical, circular, and polygonal.

[0133] The vent 130 can be installed in the vent 120 and can be opened or closed as the internal pressure of the housing 100 changes. That is, when the secondary battery 2 is operating normally, the vent 130 can close the vent 120 to prevent or substantially prevent the electrolyte in the housing 100 from leaking to the outside of the housing 100, or to prevent or substantially prevent the introduction of moisture and foreign substances into the housing 100. When thermal runaway occurs in the secondary battery 2, the vent 130 can open the vent 120 to discharge flames, gases, and fumes generated in the housing 100 to the outside of the housing 100.

[0134] According to the embodiment, the exhaust member 130 can be formed in a generally plate shape. The exhaust member 130 can be fixed to the top portion 117 of the housing 100 by any of a variety of connection methods such as welding, bolting, and mating connection methods.

[0135] Figure 8 This is a schematic perspective view illustrating the structure of some components (e.g., main components) of a secondary battery according to an embodiment of the present invention; Figure 9 This is a schematic exploded perspective view illustrating the structure of components of a secondary battery according to an embodiment of the present invention; and Figure 10 This is a schematic exploded perspective view illustrating the structure of components of a secondary battery according to an embodiment of the present invention from another angle. Figure 11 It is along Figure 8 A cross-sectional view of line BB.

[0136] refer to Figures 8 to 11 According to the embodiment, the connecting member 300 may include a sub-plate 310 that contacts and connects to the electrode terminal piece 202 of the electrode assembly 200, and a current collector 320 whose one side is connected to the sub-plate 310 by welding and whose other side is connected to the side terminal 400 by welding.

[0137] The connecting member 300 can be provided as a pair of connecting members 300. The connecting member 300 can contact and connect with the electrode terminals 202 provided on both sides or opposite sides of the housing 100, and can be connected to the positive terminal terminal 240 and the negative terminal terminal 250.

[0138] The sub-plate 310 may form the side appearance of the connecting member 300 and may be connected to the electrode terminal 202. The sub-plate 310 may include a center plate 312 and side plates 314 extending from the center plate 312 toward both sides or opposite sides.

[0139] In one embodiment, the center plate 312 can form the central appearance of the sub-plate 310 and can fully support the side plates 314 on both sides. The center plate 312 can be formed into a generally flat shape. In another embodiment, the side plates 314 and the electrode terminals 202 can be integrally joined by means of laser welding or ultrasonic welding. Accordingly, welding wires for connecting to the electrode terminals 202 can be formed on the side plates 314, and the welding wires can fix all of the stacked electrode terminals 202 to the side plates 314.

[0140] The current collector 320 according to the present embodiment can be formed of a material through which current can flow (e.g., aluminum, copper, or nickel). The current collector 320 can be disposed between the electrode assembly 200 and the cover plate 450 to face the electrode assembly 200 and the cover plate 450.

[0141] One side of the current collector 320 can be connected to the sub-plate 310. As an example, the current collector 320 can be connected to the upper end of the center plate 312. The current collector 320 can be connected to the upper end of the center plate 312 by any of a variety of connection methods such as welding and bolting.

[0142] According to an embodiment, the side terminal 400 can be electrically connected to the connecting member 300. The side terminal 400 may include a boss terminal 410 formed on the connecting member 300 to pass through the cover plate 450 and an external terminal 420 disposed on the outside of the cover plate 450 and soldered to the boss terminal 410.

[0143] The side terminals 400 can be provided as a pair of side terminals 400. The side terminals 400 can be connected to the connecting members 300 provided on each of the two sides or opposite sides of the housing 100, and can be electrically connected to each of the positive terminal 240 and the negative terminal 250 through the connecting members 300.

[0144] In one embodiment, the boss terminal 410 may be integrally formed with the connecting member 300 to protrude from the central portion of the current collector 320. The boss terminal 410 may be connected to an external terminal 420 disposed outside the cover plate 450. As an example, the boss terminal 410 may pass through the cover plate 450 and may contact the lower end of the external terminal 420. The upper surface of the boss terminal 410 may be connected to the lower end of the external terminal 420 by any of a variety of connection methods such as welding and bolting.

[0145] According to an embodiment, the cover plate 450 can close the opening 118. In an embodiment, the cover plate 450 can be provided as a pair of cover plates 450 to close the openings 118 on both sides or opposite sides of the housing 100.

[0146] According to the embodiment, the cover plate 450 can be formed to have a flat plate shape. The cover plate 450 can be disposed in the opening 118 of the housing 100. The cover plate 450 can be disposed facing the electrode terminals 202 of the electrode assembly 200. The edge regions of the cover plate 450 can be connected to the ends of the bottom portion 111, the front portion 112, the rear portion 113, and the top portion 117 by any of a variety of connection methods such as welding, bolting, and mating connection methods.

[0147] According to the embodiment, the insulating portion 500 can insulate the cover plate 450 from the side terminal 400 and the cover plate 450 from the electrode assembly 200.

[0148] The insulating portions 500 can be provided as a pair of insulating portions 500 facing each other. The insulating portions 500 insulate the cover plate 450 from the side terminals 400 and from the electrode assembly 200, and can be provided on both sides or opposite sides of the housing 100.

[0149] As an example, the insulation portion 500 may include a first insulator 600 that insulates the cover plate 450 from the side terminal 400 and a second insulator 700 that insulates the cover plate 450 from the electrode assembly 200.

[0150] The first insulator 600 may include a first plate 610 disposed between the external terminal 420 and the cover plate 450, a second plate 620 disposed between the cover plate 450 and the connecting member 300, and a connecting portion 630 connecting the first plate 610 and the second plate 620 and surrounding the boss terminal 410.

[0151] The first plate 610 and the second plate 620 can each be formed to have a substantially flat plate shape. For example, the first insulator 600 can be formed of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or rubber.

[0152] In this embodiment, the first insulator 600 can be inserted into the cover plate 450. That is, the first insulator 600 can be inserted into the cover plate 450, such that the first plate 610 can be disposed on the upper surface of the cover plate 450, and the second plate 620 can be disposed on the lower surface of the cover plate 450. Furthermore, the connecting portion 630 connecting the first plate 610 and the second plate 620 can form a space in which the boss terminal 410 can be accommodated.

[0153] An anti-movement portion 650 for preventing or substantially preventing movement of the first insulator 600 may be formed on the cover plate 450. The anti-movement portion 650 may include a through hole 652 formed through the cover plate 450 to connect the first plate 610 to the second plate 620, a first mounting groove 654 formed in the upper surface of the cover plate 450 to place the first plate 610 in a first mounting groove 654, and a second mounting groove 656 formed in the lower surface of the cover plate 450 to accommodate a portion of the second plate 620 in a second mounting groove 656.

[0154] A second insulator 700 may be disposed between the connecting member 300 and the electrode assembly 200, and may electrically insulate the connecting member 300 from the electrode assembly 200. According to the present embodiment, the second insulator 700 may be formed in a generally flat plate shape. An opening 710 may be formed in the central portion of the second insulator 700 to expose the current collector 320, and two surfaces or opposing surfaces of the second insulator 700 may contact the upper surface of the electrode assembly 200. The second insulator 700 may be formed of an insulating material such as PE, PP, PET, or rubber.

[0155] Figure 12 This is a schematic cross-sectional view illustrating the connection state of the connecting portion according to an embodiment of the present invention; Figure 13 This is a cross-sectional view illustrating the state in which the connecting parts are connected by a thermal stacking method according to an embodiment of the present invention; and Figure 14 This is a schematic cross-sectional view illustrating the connection reinforcement of a secondary battery according to an embodiment of the present invention.

[0156] refer to Figures 12 to 14 According to the embodiment, the first insulator 600 and the second insulator 700 may be integrally formed using a connecting portion 800. As an example, the connecting portion 800 may include a connecting post 810 formed to protrude downward from the first insulator 600 and a connecting hole 820 formed in the second insulator 700 such that the connecting post 810 is connected to a connecting hole 820.

[0157] In an embodiment, the connecting posts 810 and connecting holes 820 can be provided as a plurality of corresponding connecting posts 810 and a plurality of corresponding connecting holes 820. The connecting posts 810 and connecting holes 820 can be provided as a plurality of corresponding connecting posts 810 and a plurality of corresponding connecting holes 820 in the regions of the first insulator 600 and the second insulator 700, and the number of connecting posts 810 and connecting holes 820 can be varied.

[0158] In an embodiment, the connecting post 810 can be connected to the connecting hole 820 by a thermal stacking method. The thermal stacking method is a method of heating the connecting post 810 inserted into the connecting hole 820 to melt the protruding portion of the connecting post 810 so that the molten material is fixedly adhered to the periphery of the connecting hole 820.

[0159] The connecting post 810 can be formed to have a length greater than that of the connecting hole 820. That is, the connecting post 810 can be formed to have a length that enters through one side of the connecting hole 820 and protrudes from the other side of the connecting hole 820. Accordingly, the portion of the connecting post 810 that protrudes outward from the other side of the connecting hole 820 can be melted and fixedly adhered to the periphery of the connecting hole 820 by a thermal stacking method.

[0160] In an embodiment, the connecting hole 820 may include a connecting reinforcement 900 to strengthen the connection with the connecting post 810. In an embodiment, the connection between the connecting hole 820 and the connecting post 810 may be strengthened using the connecting reinforcement 900. In an embodiment, the connecting reinforcement 900 may be formed as at least one stepped surface located on the inner surface of the connecting hole 820. For example, as... Figure 12 As shown, since the inner surface of the connecting hole 820 is formed as a plurality of stepped surfaces with different diameters in the entry direction of the connecting post 810, and since the connecting post 810, which is melted by the thermal stacking method, fills the connecting hole 820 and has a wide contact area and serves as a hooking step, the separation of the first insulator 600 and the second insulator 700 can be prevented more effectively.

[0161] Figures 15 to 17 This is a cross-sectional view illustrating a modified example of the connection reinforcement of a secondary battery according to some embodiments of the present invention.

[0162] refer to Figures 15 to 17 According to the current embodiment, the shape of the connecting reinforcement 900 can be changed in different ways, and the connecting reinforcement 900 can prevent or substantially prevent the separation of the first insulator 600 and the second insulator 700.

[0163] refer to Figure 15 In one embodiment, the connecting reinforcement 900 may be formed as a tapered surface on the inner surface of the connecting hole 820. The inner surface of the connecting hole 820 may be formed as a tapered surface that expands from the side through which the connecting post 810 enters towards the other side. In this case, since the length of the connecting post 810 is greater than the length of the connecting hole 820, and the connecting post 810, after being melted by the thermal stacking method, fills the connecting hole 820 with a diameter that increases downward and forms a wide contact area and serves as a hooking step, separation of the first insulator 600 from the second insulator 700 can be prevented or substantially prevented.

[0164] In the embodiment, reference Figure 16 The connecting reinforcement 900 can be formed as a non-uniform surface on the inner surface of the connecting hole 820. As an example, since the inner surface of the connecting hole 820 is formed as a non-uniform surface with a thread shape, and the connecting post 810, after being melted by the thermal stacking method, fills the connecting hole 820 to form a wide contact area, separation of the first insulator 600 and the second insulator 700 can be prevented or substantially prevented.

[0165] In the embodiment, reference Figure 17 The connecting reinforcement 900 can be formed as a plurality of ribs inside the connecting hole 820. The diameter of the connecting hole 820 can be larger than the diameter of the connecting post 810, and the plurality of ribs can be formed to protrude from the inner surface of the connecting hole 820 toward its center (or toward the connecting post 810). As an example, the plurality of ribs can be arranged to be spaced apart from each other in all directions on the inner surface of the connecting hole 820. As the ribs protrude, grooves are formed on the inner surface of the connecting hole 820, and the connecting post 810, melted by a thermal stacking method, fills the connecting hole 820 to form a wide contact area and serve as a hook step, and thus can prevent or substantially prevent separation of the first insulator 600 from the second insulator 700.

[0166] Figure 18 This is a schematic diagram illustrating the assembly process of a secondary battery according to an embodiment of the present invention.

[0167] refer to Figure 18 In the secondary battery 2 according to the embodiment, the side terminal 400, the cover plate 450 and the insulating part 500 can be modularized into a single component, thereby improving assemblability.

[0168] In this embodiment, the external terminal 420, cover plate 450, and first insulator 600 can be formed by insert injection molding, and the first insulator 600 and second insulator 700 can be integrated into each other as a single unit using a thermal stacking method with connecting posts 810 and connecting holes 820. In this embodiment, the components can be supplied as a single unit, and the existing process for placing the second insulator 700 and the "11-shaped" tape adhesion process for fixing the second insulator 700 can be omitted.

[0169] During assembly, the connecting member 300 is welded to the tape-shaped electrode assembly 200, which is inserted into the housing 100. The side terminals 400, cover plate 450, and insulating part 500, which are modularized and provided as a single component, are placed in the opening 118 of the housing 100. The cover plate 450 is welded to the edge of the opening 118 of the housing 100, and welding is performed for the electrical connection of the external terminal 420 and the boss terminal 410 to complete the assembly.

[0170] As described above, unlike existing methods that provide separate components and supply each component separately, in this method, since the components are modularized into cover assemblies, each component can be supplied at once, and accompanying processes can be omitted, thereby simplifying the process and increasing productivity.

[0171] According to an embodiment of the present invention, the cover plate and the insulating part for insulating the electrode assembly are integrated into a whole, and unnecessary processes can be omitted, thereby simplifying the assembly process and improving the insulation reliability.

[0172] According to an embodiment of the present invention, the side terminal, cover plate and insulation are modularized into a single component, and the tape process for fixing the insulation can be omitted, thereby supplying the components together, simplifying the assembly process and improving productivity.

[0173] According to an embodiment of the present invention, the first insulator and the cover plate can be inserted and can be firmly fixed by an anti-movement part. The first insulator and the second insulator are connected or integrated into a whole by a thermal stacking method. The connection structure can be simplified and the volume can be reduced.

[0174] According to an embodiment of the present invention, when the first insulator is connected to the second insulator, the first insulator and the second insulator can be firmly connected by the connection reinforcement, thereby improving reliability.

[0175] However, the aspects and effects that can be obtained through this disclosure are not limited to those described above, and those skilled in the art can clearly understand other technical aspects and effects not mentioned based on the description of this disclosure.

[0176] While this disclosure has been described with reference to some embodiments shown in the accompanying drawings, these embodiments are merely illustrative, and it should be understood that those skilled in the art can derive various modifications and equivalent other embodiments based on these embodiments.

Claims

1. A secondary battery, comprising: Electrode assembly, including electrode terminals; The electrode assembly is housed within the housing; The connecting component is electrically connected to the electrode terminals; The side terminal is electrically connected to the connecting member; A cover plate is attached to an opening in the housing, through which the side terminals pass; as well as The insulating portion insulates the cover plate from the side terminal and from the electrode assembly.

2. The secondary battery according to claim 1, wherein, The side terminal includes: A boss terminal, passing through the cover plate and located on the connecting member; and External terminals are located on the outside of the cover plate and are welded to the boss terminals.

3. The secondary battery according to claim 2, wherein, The insulating portion includes: A first insulator insulates the cover plate from the side terminals; and A second insulator insulates the cover plate from the electrode assembly.

4. The secondary battery according to claim 3, wherein, The first insulator includes: The first plate is located between the external terminal and the cover plate; A second plate is located between the cover plate and the connecting member; and A connecting portion that connects the first plate and the second plate and surrounds the boss terminal.

5. The secondary battery according to claim 4, wherein, The first insulator is inserted and injected into the cover plate.

6. The secondary battery according to claim 5, wherein, An anti-movement part configured to prevent movement of the first insulator is located on the cover plate.

7. The secondary battery according to claim 6, wherein, The anti-movement part includes: A connecting hole passes through the cover plate to connect the first plate and the second plate to each other; A first mounting groove, in the upper surface of the cover plate, such that the first plate is positioned within the first mounting groove; and A second mounting groove is provided in the lower surface of the cover plate such that a portion of the second plate is accommodated within the second mounting groove.

8. The secondary battery according to claim 3 or 4, wherein, The first insulator and the second insulator are provided integrally via a connecting portion.

9. The secondary battery according to claim 8, wherein, The connecting part includes: The connecting post protrudes downward from the first insulator; and A connecting hole is provided in the second insulator to which the connecting post is connected.

10. The secondary battery according to claim 9, wherein, The connecting post is connected to the connecting hole by a thermal stacking method.

11. The secondary battery according to claim 10, wherein, The connecting post has a length greater than the length of the connecting hole.

12. The secondary battery according to claim 10, further comprising: A connecting reinforcement is configured to strengthen the connection between the connecting hole and the connecting post.

13. The secondary battery according to claim 12, wherein, The connecting reinforcement includes at least one stepped surface on the inner surface of the connecting hole.

14. The secondary battery according to claim 12, wherein, The connecting reinforcement includes a tapered surface on the inner surface of the connecting hole.

15. The secondary battery according to claim 12, wherein, The connecting reinforcement includes an uneven surface on the inner surface of the connecting hole.

16. The secondary battery according to claim 12, wherein: The connecting hole has a diameter larger than that of the connecting post, and The connecting reinforcement includes a plurality of ribs protruding from the inner surface of the connecting hole toward the connecting post.

17. The secondary battery according to claim 1, wherein, The side terminal, the cover plate, and the insulation are modularized into a single component.

18. The secondary battery according to claim 17, wherein, The insulating portion includes: A first insulator insulates the cover plate from the side terminals; and A second insulator insulates the cover plate from the electrode assembly. The first insulator is integrated with the cover plate as a whole by insert injection.

19. The secondary battery according to claim 18, wherein, The first insulator and the second insulator are integrated into a whole by a thermal stacking method.

20. A battery pack comprising: shell; as well as One or more secondary batteries according to any one of claims 1 to 19, wherein the secondary battery is located in the housing.

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