Secondary battery and battery pack including same

Abstract

The present disclosure relates to a secondary battery and a battery pack including the same. A secondary battery includes: a case; an electrode assembly inside the case and having a first electrode and a second electrode; a first tab member connected to the first electrode and extending from the electrode assembly; a cap plate coupled to the case and facing the electrode assembly; a first current collector between the electrode assembly and the cap plate and connected to the first tab member; and a first terminal extending from the first current collector and configured to be deformable. According to some embodiments of the present disclosure, since terminals of different secondary batteries can be directly connected without a bus bar by deforming one terminal extending outward from a cap plate, the number of parts for electrical connection can be relatively reduced, contact resistance between the parts can be reduced, and manufacturing cost can be relatively reduced.

Description

Technical Field

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

[0002] Generally speaking, due to the recent surge in battery-powered electronic devices such as mobile phones, laptop computers, and electric vehicles, the demand for rechargeable batteries with high energy density and high capacity has increased rapidly. Therefore, research and development to improve the performance of lithium-ion rechargeable batteries are actively underway.

[0003] A lithium secondary battery is a battery that includes a positive electrode and a negative electrode containing active materials capable of intercalating and deintercalating lithium ions, as well as an electrolyte solution, and generates energy through oxidation / reduction reactions when lithium ions are intercalated / deintercalated at the positive and negative electrodes.

[0004] The information disclosed in this background section is only used to enhance the understanding of the background, and therefore the information discussed in this background section does not necessarily constitute prior art. Summary of the Invention

[0005] Some aspects of embodiments of this disclosure include secondary batteries and battery packs including secondary batteries, wherein the number of parts can be relatively reduced.

[0006] These and other aspects and features of embodiments of this disclosure will be described in more detail in or from the following description of some embodiments of this disclosure.

[0007] A secondary battery according to some embodiments of the present disclosure includes: a housing; an electrode assembly inside the housing and having a first electrode and a second electrode; a first connecting member connected to the first electrode and extending from the electrode assembly; a cover plate coupled to the housing and facing the electrode assembly; a first current collector between the electrode assembly and the cover plate and connected to the first connecting member; and a first terminal extending from the first current collector and provided to be deformable.

[0008] According to some embodiments, the first terminal may include: a first support plate connected to a first current collector; and a first bending plate extending from the first support plate in a first direction and projecting outward from the cover plate, and the first bending plate being bendable about a second direction intersecting the first direction.

[0009] According to some embodiments, the first support plate and the first bending plate may intersect each other.

[0010] According to some embodiments, the ratio of the protruding length of the first bending plate to the width of the cover plate can be 0.5 or more and 1 or less.

[0011] According to some embodiments, the first terminal may further include a first notch that is recessed from the first bending plate in a direction parallel to the second direction.

[0012] According to some embodiments, the first notch may be located on each of the two sides of the first bent plate.

[0013] According to some embodiments, the first current collector may include: a first current collector plate facing and in contact with the first terminal piece; and a first connecting member between the first current collector plate and the first terminal and supporting the first terminal relative to the first current collector plate.

[0014] According to some embodiments, the first connecting member may include a first bent portion that is bendable about a second direction.

[0015] According to some embodiments, the secondary battery may further include a first gasket between the cover plate and the first terminal.

[0016] According to some embodiments, the first liner may include: a first liner body extending through the cover plate; a first inner liner extending from the first liner body and surrounding the first support plate; and a first outer liner extending from the first liner body and surrounding the first bent plate.

[0017] According to some embodiments, the distance from the first bending plate to the outer peripheral surface of the first outer liner can be 3 mm or more.

[0018] According to some embodiments, the cross-sectional area of ​​the first inner liner and the first outer liner perpendicular to the first direction may be greater than the cross-sectional area of ​​the first liner body perpendicular to the first direction.

[0019] According to some embodiments, a first inner liner may contact a first surface of the cover plate, and a first outer liner may contact a second surface of the first cover plate opposite to the first surface.

[0020] According to some embodiments, the first terminal may further include a first connection hole that passes through the first bent plate and a first gasket is inserted into the first connection hole.

[0021] According to some embodiments, the first terminal may further include a first notch that is recessed from the first bent plate in a direction parallel to the second direction, and the first connection hole may face the first notch in the second direction.

[0022] According to some embodiments, the secondary battery may further include: a second terminal member connected to and extending from the second electrode assembly; a second current collector between the electrode assembly and the cover plate and connected to the second terminal member; and a second terminal extending from the second current collector and provided to be deformable.

[0023] According to some embodiments, the first terminal piece and the second terminal piece may extend from the electrode assembly in a first direction.

[0024] According to some embodiments, the secondary battery may further include insulating components surrounding the casing and cover.

[0025] A battery pack according to some embodiments of the present disclosure includes: a housing; and a plurality of secondary batteries inside the housing, wherein the secondary batteries include: the housing; an electrode assembly inside the housing and having a first electrode and a second electrode; a first terminal block member connected to the first electrode and extending from the electrode assembly; a cover plate coupled to the housing and facing the electrode assembly; a first current collector between the electrode assembly and the cover plate and connected to the first terminal block; and a first terminal extending from the first current collector and provided to be deformable.

[0026] According to some embodiments, the secondary battery may further include a second terminal connected to a second electrode and spaced apart from the first terminal, and the first terminal of one secondary battery may be directly connected to the first terminal or the second terminal of another secondary battery. Attached Figure Description

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

[0028] Figure 1 A schematic perspective view illustrating the configuration of a secondary battery according to some embodiments of the present disclosure;

[0029] Figure 2 A schematic exploded perspective view illustrating the configuration of a secondary battery according to some embodiments of the present disclosure;

[0030] Figure 3 A schematic perspective view illustrating the configuration of electrode assemblies according to some embodiments of the present disclosure;

[0031] Figure 4 A schematic exploded perspective view illustrating the configuration of electrode assemblies according to some embodiments of the present disclosure;

[0032] Figure 5 A schematic perspective view illustrating the configuration of a first current collector and a first terminal according to some embodiments of the present disclosure;

[0033] Figure 6 for Figure 5 An exploded perspective view;

[0034] Figure 7 for Figure 5 The main view;

[0035] Figure 8 for Figure 5 Cross-sectional view;

[0036] Figure 9 To show Figure 8 A schematic diagram of the unfolded state of the first bend in the middle;

[0037] Figure 10 To show Figure 8 A schematic diagram showing the bent state of the first bending plate in the diagram;

[0038] Figure 11 A schematic plan view illustrating the arrangement relationship between the first bent plate and the first gasket according to some embodiments of the present disclosure;

[0039] Figure 12 A schematic perspective view illustrating the configuration of the second current collector and the second terminal according to some embodiments of the present disclosure;

[0040] Figure 13 for Figure 12 An exploded perspective view;

[0041] Figure 14 for Figure 12 The main view;

[0042] Figure 15 for Figure 12 Cross-sectional view;

[0043] Figure 16 A schematic plan view illustrating the arrangement relationship between the second bent plate and the second liner according to some embodiments of the present disclosure;

[0044] Figure 17 A schematic perspective view illustrating the configuration of a battery pack according to some embodiments of the present disclosure; and

[0045] Figure 18 A schematic enlarged view illustrating the electrical connection configuration of a battery pack according to some embodiments of the present disclosure. Detailed Implementation

[0046] In this document, aspects of 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, and based on the principle that the inventor can be his / her own lexicographer to appropriately define terms and concepts for the best interpretation of his / her disclosure, they should be interpreted as meanings and concepts consistent with the technical spirit of the present disclosure.

[0047] The embodiments described in this specification and the configurations shown in the accompanying drawings are provided only as some exemplary embodiments of this disclosure and do not represent all technical ideas, aspects, and features of this disclosure. Therefore, 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.

[0048] 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, it may be directly on, 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.

[0049] In the accompanying drawings, the dimensions of various elements, layers, etc., may be enlarged for clarity. The same reference numerals denote the same elements. As used herein, the term "and / or" includes any and all combinations of one or more of the associated enumerated items. Furthermore, the use of "may" in describing embodiments of this disclosure refers to "one or more embodiments of this disclosure." Expressions such as "at least one of..." and "any one of..." modify the entire list of elements, not individual elements within the list, when preceding / following the list of elements. 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 "selected from at least one of A, B, and C" are used to denote 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 terms "used" and "used for" may be considered synonymous with the terms "utilized" and "exploited," respectively. As used herein, the terms “substantially,” “about,” and similar terms are used as approximations rather than terms of degree and are intended to describe the inherent variations in measured or calculated values ​​that would be recognized by one of ordinary skill in the art.

[0050] It will be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, areas, layers, and / or segments, these elements, components, areas, layers, or segments should not be limited by these terms. These terms are used to distinguish one element, component, area, layer, or segment from another. Therefore, the first element, component, area, layer, or segment discussed below may be referred to as the second element, component, area, layer, or segment without departing from the teachings of the exemplary embodiments.

[0051] For ease of description, spatial relative terms, such as “below,” “under,” “down,” “above,” and “above,” are used herein to describe the relationship of one element or feature to another element or feature illustrated in the figures. It will be understood that, in addition to the orientation depicted in the figures, spatial relative terms are intended to cover different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element or feature described as “below” or “under” other elements or features will be oriented “above” or “above” other elements or features. Thus, the term “below” can cover both above and below orientations. The device may be oriented in other ways (e.g., rotated 90 degrees or otherwise), and the spatial relative descriptors used herein should be interpreted accordingly.

[0052] The terminology used herein is for describing embodiments of this disclosure and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form “a” as used herein is intended to include the plural form as well. It will be further understood that the term “comprising” as used in this specification indicates the presence of said features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0053] Furthermore, any numerical range disclosed and / or set forth herein is intended to include all subranges with the same numerical precision contained within the set forth range. For example, the range “1.0 to 10.0” is intended to include all subranges between the stated minimum value of 1.0 and the stated maximum value of 10.0, i.e., minimum values ​​equal to or greater than 1.0 and maximum values ​​equal to or less than 10.0, such as, for example, 2.4 to 7.6. Any maximum numerical limit set forth herein is intended to include all lower numerical limits contained herein, and any minimum numerical limit set forth in this specification is intended to include all higher numerical limits contained herein. Therefore, the applicant reserves the right to amend this specification (including the claims) to expressly set forth any subranges contained within the range expressly set forth herein.

[0054] Referring to two compared elements, features, etc., as "identical" can mean that they are "substantially identical." Therefore, the phrase "substantially identical" can include situations in the art where the deviation is considered low, for example, a deviation of 5% or less. Additionally, when a parameter is described as uniform in a given region, this can mean that it is uniform in terms of average value.

[0055] Throughout this specification, unless otherwise stated, each element may be singular or plural.

[0056] When any element is referred to as being arranged (or positioned or placed) "above (or below)" or "on top (or below)" of a component, it may mean that the element may be positioned to contact the upper (or lower) surface of the component, and may also mean that another component may be located between the component and any element arranged (or positioned or placed) on (or below) the component.

[0057] Furthermore, it will be understood that when an element is referred to as "connected," "linked," or "attached" to another element, these elements may be directly "connected," "linked," or "attached" to each other, or there may be one or more intermediary elements between them, allowing the element to be "connected," "linked," or "attached" to the other element through one or more intermediary elements. Additionally, when a part is referred to as "electrically connected" to another part, that part may be directly electrically connected to the other part, or there may be one or more intermediary parts between them, allowing the part and the other part to be indirectly electrically connected to each other.

[0058] Throughout this specification, unless otherwise stated, when “A and / or B” is used, it means A, B, or A and B. That is, “and / or” includes any or all combinations of the listed items. Unless otherwise indicated, when “C to D” is used, it means C and below D.

[0059] The terminology used in this specification is for describing embodiments of this disclosure and is not intended to limit this disclosure.

[0060] Figure 1 A schematic perspective view illustrating the configuration of a secondary battery according to some embodiments of the present disclosure, and Figure 2 A schematic exploded perspective view illustrating the configuration of a secondary battery according to some embodiments of the present disclosure.

[0061] In the following description, examples of secondary batteries that are lithium-ion secondary batteries and are prismatic batteries will be described. However, embodiments according to this disclosure are not limited thereto, and secondary batteries may be lithium polymer batteries or cylindrical batteries.

[0062] refer to Figure 1 and Figure 2 According to some embodiments, the secondary battery 1 includes a housing 100, an electrode assembly 200, a first connecting piece member 301, a cover assembly 400, a first current collector 500, and a first terminal 600.

[0063] The housing 100 can form the rough exterior of the secondary battery 1 and house the electrode assembly 200.

[0064] According to some embodiments, the housing 100 may include a bottom portion 110, a front portion 120, a rear portion 130, a first side portion 140, and a second side portion 150.

[0065] The bottom portion 110 may form the lower exterior of the housing 100 (see...). Figure 2 According to some embodiments, the bottom portion 110 may have a rectangular plate shape. The bottom portion 110 may be disposed on the housing body 21 (see...). Figure 17 On the bottom surface of ).

[0066] The front portion 120, the rear portion 130, the first side portion 140, and the second side portion 150 can form the exterior of the peripheral surface of the housing 100.

[0067] According to some embodiments, the front portion 120, rear portion 130, first side portion 140, and second side portion 150 may have a plate shape extending upward from the edge of the bottom portion 110 (see...). Figure 2 The front portion 120, the rear portion 130, the first side portion 140, and the second side portion 150 can be arranged to form a space on the bottom portion 110. The front portion 120, the rear portion 130, the first side portion 140, and the second side portion 150 can be arranged to form a rectangular cross-sectional shape.

[0068] According to some embodiments, the front portion 120 and the rear portion 130 may extend from the long side section of the bottom portion 110. The front portion 120 and the rear portion 130 may be arranged in parallel. The areas of the front portion 120 and the rear portion 130 may be the same.

[0069] According to some embodiments, a first side portion 140 and a second side portion 150 may extend from a short side section of the bottom portion 110. The first side portion 140 and the second side portion 150 may be arranged perpendicular to the front portion 120 and the rear portion 130. The first side portion 140 and the second side portion 150 may be arranged parallel to or extend parallel to each other. The areas of the first side portion 140 and the second side portion 150 may be the same. The areas of the first side portion 140 and the second side portion 150 may be smaller than the areas of the front portion 120 and the rear portion 130.

[0070] According to some embodiments, the housing 100 may further include an opening 160. According to some embodiments, the opening 160 may be a space surrounded by an upper portion of a front portion 120, a rear portion 130, a first side portion 140, and a second side portion 150. The opening 160 interconnects the internal and external spaces of the housing 100.

[0071] Therefore, the housing 100 according to some embodiments may have a cuboid shape with an open upper side.

[0072] The first direction to be described below can be in Figure 1 and Figure 2 The direction is parallel to the Z-axis, extending from the bottom portion 110 towards the opening 160. The second direction could be... Figure 1 and Figure 2The direction parallel to the Y-axis extends from the first side portion 140 toward the second side portion 150. The third direction can be... Figure 1 and Figure 2 The direction is parallel to the X-axis from the front part 120 to the rear part 130.

[0073] The electrode assembly 200 can be used as a unit structure for performing charging and discharging operations of the electricity in the secondary battery 1. The electrode assembly 200 can be housed inside the housing 100.

[0074] Figure 3 A schematic perspective view illustrating the configuration of electrode assemblies according to some embodiments of the present disclosure, and Figure 4 A schematic exploded perspective view illustrating the configuration of electrode assemblies according to some embodiments of the present disclosure.

[0075] refer to Figures 1 to 4 According to some embodiments, the electrode assembly 200 may include a first electrode 210, a second electrode 220, and a diaphragm 230 located between the first electrode 210 and the second electrode 220. Multiple first electrodes 210, diaphragms 230, and second electrodes 220 may be provided.

[0076] The following will describe in more detail an example of the electrode assembly 200 having a stacked configuration, wherein a plurality of first electrodes 210, diaphragms 230, and second electrodes 220 are stacked sequentially in a third-order direction. However, the electrode assembly 200 is not limited thereto, and may be configured such that the first electrodes 210, diaphragms 230, and second electrodes 220 are stacked or arranged clockwise or counterclockwise on a winding shaft.

[0077] The first electrode 210 can be used as one of the positive and negative electrodes of the electrode assembly 200. An example of the first electrode 210 being the positive electrode of the electrode assembly 200 will be described in more detail below. However, the first electrode 210 is not limited thereto and can also be used as the negative electrode of the electrode assembly 200.

[0078] According to some embodiments, the first electrode 210 can be formed in the shape of a foil containing a metallic material such as aluminum or an aluminum alloy. The type, size, shape, etc., of the first electrode 210 are not particularly limited, as long as the first electrode 210 is conductive and will not cause chemical changes in the secondary battery. The cross-sectional shape of the first electrode 210 can be modified by design to have any shape other than a rectangular shape.

[0079] Multiple first electrodes 210 may be provided. The multiple first electrodes 210 may be arranged in a third-direction orientation between the front portion 120 and the rear portion 130 of the housing 100. The number of first electrodes 210 may be varied in various ways depending on the charging capacity of the secondary battery 1, etc.

[0080] The first active material layer 211 can be applied on at least a part of the first electrode 210. The first active material layer 211 can be applied on both surfaces of the first electrode 210, or alternatively, can be applied on only one surface of the first electrode 210.

[0081] According to some embodiments, since the first electrode 210 serves as a positive electrode, the first active material layer 211 can include a positive electrode active material.

[0082] The positive electrode active material can be a compound (lithiated insertion compound) capable of reversibly inserting and extracting lithium ions. For example, as the positive electrode active material, one or more of composite oxides of lithium and metals selected from cobalt, manganese, nickel, iron, and combinations thereof can be used.

[0083] As an example, the positive electrode active material can include lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM), etc. Here, 0 < x < 1, 0 < y < 1, 0 < z < 1, and x + y + z = 1 can be satisfied. The positive electrode active material can include only lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM) one of them, or include lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM) two or all of them.

[0084] The first active material layer 211 can further include a positive electrode conductive material.

[0085] The positive electrode conductive material is used to provide conductivity for the first active material layer 211, and any material of conductive material that does not cause chemical changes can be used. Examples of the positive electrode conductive material can include carbonaceous materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, and carbon nanotube; metallic materials in the form of metal powder or containing metal fibers such as copper, nickel, aluminum, silver, etc.; conductive polymers such as poly(phenylene) derivatives; and mixtures thereof.

[0086] The first active material layer 211 can further include a positive electrode binder.

[0087] The positive electrode binder is used to effectively bind the particles constituting the positive electrode active material, and also to effectively bind the positive electrode active material to the first electrode 210.

[0088] Examples of positive electrode binders include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0089] Non-aqueous adhesives may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, or combinations thereof.

[0090] Waterborne adhesives may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, 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.

[0091] When the aqueous binder is used as a positive electrode binder, the aqueous binder may further include a cellulose-based compound capable of providing viscosity. As a cellulose-based compound, one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be used in combination. The alkali metal may be Na, K, or Li.

[0092] Dry adhesives can be fibrous polymeric materials, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0093] The first electrode 210 may include a first uncoated portion 212 thereon to which the first active material layer 211 is not applied. According to some embodiments, the first uncoated portion 212 may be located in the upper portion region of the first electrode 210 arranged within the housing 100 facing the opening 160. However, the first uncoated portion 212 is not limited thereto and may be formed over the entire edge region of the first electrode 210.

[0094] The second electrode 220 can be used as one of the positive and negative electrodes of the electrode assembly 200. An example of the second electrode 220 being the negative electrode of the electrode assembly 200 will be described below. However, the second electrode 220 is not limited thereto and can also be used as the positive electrode of the electrode assembly 200.

[0095] A plurality of second electrodes 220 may be provided. The plurality of second electrodes 220 may be arranged between the front portion 120 and the rear portion 130 of the housing 100 in a third direction. The first electrode 210 and the second electrodes 220 may be alternately arranged in the third direction. The second electrodes 220 may be spaced apart from the first electrode 210 by a distance (e.g., a set or predetermined distance) in the third direction.

[0096] According to some embodiments, the second electrode 220 may be formed in a foil shape including a metal material such as copper, copper alloy, nickel, or nickel alloy. The type, size, shape, etc. of the second electrode 220 are not particularly limited as long as the second electrode 200 is conductive and does not cause a chemical change in the secondary battery. The cross-sectional shape of the second electrode 220 may be changed in design to have any shape among various shapes other than a rectangular shape.

[0097] The second active material layer 221 may be applied to at least a part of the second electrode 220. The second active material layer 221 may be applied to both surfaces of the second electrode 220, or alternatively, applied to only one surface of the second electrode 200.

[0098] Since the second electrode 220 serves as a negative electrode, the second active material layer 221 may include a negative electrode active material.

[0099] The negative electrode active material may include a material capable of reversibly inserting / extracting lithium ions, lithium metal, a lithium metal alloy, a material doped and undoped with lithium, or a transition metal oxide.

[0100] The material capable of reversibly inserting / extracting lithium ions may include a carbon-based negative electrode active material, such as crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon may include graphite, such as natural graphite or artificial graphite in amorphous, plate-like, flaky, spherical, or fibrous forms, and examples of amorphous carbon may include soft carbon, hard carbon, mesophase pitch carbide, calcined coke, etc.

[0101] As the lithium metal alloy, an alloy of lithium and a metal selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn may be used.

[0102] As the material doped and undoped with lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material may be used. The Si-based negative electrode active material may be silicon, a silicon-carbon composite, SiO x (0 < x ≤ 2), a Si-Q alloy (Q is selected from 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 may be Sn, SnO x(0 < x ≤ 2, such as SnO2), Sn-based alloys, or combinations thereof.

[0103] The silicon-carbon composite may be a composite of silicon and amorphous carbon. According to some embodiments, the silicon-carbon composite may be in the form of silicon particles and amorphous carbon coated on the surface of the silicon particles. For example, the silicon-carbon composite may include secondary particles (cores) formed from primary silicon particles and an amorphous carbon coating (shells) located on the surface of the secondary particles. For example, the amorphous carbon may be located between the primary silicon particles such that the primary silicon particles may be coated with amorphous carbon. The secondary particles may exist by being dispersed in an amorphous carbon matrix.

[0104] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core containing crystalline carbon and silicon particles and an amorphous carbon coating located on the surface of the core.

[0105] The Si-based negative electrode active material or the Sn-based negative electrode active material may be used in combination with a carbon-based negative electrode active material.

[0106] The second active material layer 221 may further include a negative electrode conductive material and a negative electrode binder.

[0107] The negative electrode conductive material is used to provide conductivity to the second active material layer 221, and any conductive material that does not cause chemical changes may be used. Examples of the negative electrode conductive material may include carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes; metal-based materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers such as polyphenylene derivatives; and mixtures thereof.

[0108] The negative electrode binder is used to well bond the particles constituting the negative electrode active material and is also used to well bond the negative electrode active material to the second electrode 220.

[0109] Examples of the negative electrode binder include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0110] The non-aqueous binder may include polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, or combinations thereof.

[0111] Waterborne adhesives may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, 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.

[0112] When the aqueous binder is used as a negative electrode binder, the aqueous binder may further include a cellulose-based compound capable of providing viscosity. As a cellulose-based compound, one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be used in combination. The alkali metal may be Na, K, or Li.

[0113] Dry adhesives can be fibrous polymeric materials, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0114] The second electrode 220 may include a second uncoated portion 222 thereon on which the second active material layer 221 is not applied. According to some embodiments, the second uncoated portion 222 may be located in the upper portion region of the second electrode 220 arranged within the housing 100 facing the opening 160. However, the second uncoated portion 222 is not limited thereto and may be formed on the entire edge region of the second electrode 220.

[0115] The diaphragm 230 may be located between the first electrode 210 and the second electrode 220. The diaphragm 230 can be used to prevent or reduce short circuits between the first electrode 210 and the second electrode 220, while allowing lithium ions to move between the first electrode 210 and the second electrode 220.

[0116] The diaphragm 230 can be arranged to completely cover the surface area of ​​the electrode assembly 200. Therefore, the diaphragm 230 can prevent or reduce the direct exposure of the first electrode 210 and the second electrode 220 to the outside of the electrode assembly 200.

[0117] As the diaphragm 230, a multilayer membrane of polyethylene, polypropylene, or polyvinylidene fluoride, etc., with two or more layers, can be used, and a mixed multilayer membrane, such as a two-layer membrane of polyethylene / polypropylene, a three-layer membrane of polyethylene / polypropylene / polyethylene, or a three-layer membrane of polypropylene / polyethylene / polypropylene, can be used.

[0118] The diaphragm 230 may include a porous substrate and a coating on one or both surfaces of the porous substrate, comprising organic materials, inorganic materials or combinations thereof.

[0119] The porous substrate may be a polymer film made of one polymer selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as 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, Teflon and polytetrafluoroethylene, or copolymers or mixtures of two or more of the above materials.

[0120] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0121] Inorganic materials may include, but are not limited to, inorganic particles selected from Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite and combinations thereof.

[0122] Organic and inorganic materials can exist in a coating by mixing them together, or in the form of a coating that includes organic materials and a coating that includes inorganic materials stacked together.

[0123] The first terminal member 301 can be connected to the first electrode 210 and can protrude outward from the electrode assembly 200. Since the first electrode 210 is exemplified as a positive electrode, the first terminal member 301 can be used as a positive electrode terminal of the secondary battery 1. However, the first terminal member 301 is not limited to this, and can be used as a negative electrode terminal of the secondary battery 1 when the first electrode 210 is a negative electrode.

[0124] According to some embodiments, a first contact member 301 may extend from the electrode assembly 200 in a first direction. That is, the first contact member 301 may extend inside the housing 100 toward the opening 160.

[0125] A plurality of first terminal block members 301 may be provided. The plurality of first terminal block members 301 may be arranged in a second direction. As an example, a pair of first terminal block members 301 may be formed according to some embodiments, and the pair of first terminal block members 301 may be arranged to be spaced apart from each other by a distance (e.g., a set or predetermined distance) in the second direction.

[0126] According to some embodiments, the first connector component 301 may include a plurality of first connectors 310.

[0127] According to some embodiments, the first terminal block 310 may have a foil shape extending from the first uncoated portion 212 of the first electrode 210 in a first direction. The first terminal block 310 may have a rectangular shape (or substantially rectangular shape). However, the shape of the first terminal block 310 is not limited to this and may be varied in design to have any shape of various types.

[0128] The first terminal block 310 may be integrally formed with the first electrode 210. For example, the first terminal block 310 may be the remaining area of ​​the first uncoated portion 212 after a portion of the first uncoated portion 212 has been cut or removed by a grooving process or the like. Alternatively, the first terminal block 310 may be manufactured separately from the first electrode 210 and then connected to the first uncoated portion 212 by welding or the like. The material of the first terminal block 310 may be the same as the material of the first electrode 210.

[0129] The number of first tabs 310 may be the same as the number of first electrodes 210. Each first tab 310 may extend individually from a first uncoated portion 212 of one of the different first electrodes 210. Adjacent first tabs 310 may be arranged to face each other in a third-party direction. That is, a plurality of first tabs 310 may be arranged in a third-party direction. Adjacent first tabs 310 may be arranged in parallel. Thus, according to some embodiments, the first tab member 301 may be an assembly of a plurality of first tabs 310 arranged in a third-party direction. Adjacent first tabs 310 may contact each other or be spaced apart by the thickness of the diaphragm 230.

[0130] According to some embodiments, the secondary battery 1 may further include a second terminal piece 302.

[0131] The second terminal member 302 can be connected to the second electrode 220 and can protrude outward from the electrode assembly 200. Since the second electrode 220 is exemplified as a negative electrode, the second terminal member 302 can be used as a negative electrode terminal of the secondary battery 1. However, the second terminal member 302 is not limited to this, and can be used as a positive electrode terminal of the secondary battery 1 when the second electrode 220 is a positive electrode.

[0132] According to some embodiments, the second contact member 302 may extend from the electrode assembly 200 in a first direction. That is, the second contact member 302 may extend inside the housing 100 toward the opening 160. Hereinafter, although an example of the second contact member 302 extending from the electrode assembly 200 in a first direction is described, the second contact member 302 is not limited thereto and may extend in a direction different from the first direction.

[0133] The first connector member 301 and the second connector member 302 may be arranged to be spaced apart from each other in a second direction. As an example, the second connector member 302 may be located at a position spaced apart from the first connector member 301 by a distance (e.g., a set or predetermined distance) in the second direction.

[0134] Multiple second connector members 302 may be provided. The multiple second connector members 302 may be arranged in a second direction. As an example, a pair of second connector members 302 may be formed according to some embodiments, and the pair of second connector members 302 may be arranged to be spaced apart from each other by a distance (e.g., a set or predetermined distance) in a second direction.

[0135] The second connector component 302 may include a plurality of second connectors 320.

[0136] According to some embodiments, the second terminal block 320 may have a foil shape extending from the second uncoated portion 222 of the second electrode 220 in a first direction. The second terminal block 320 may have a rectangular shape (or substantially rectangular shape). However, the shape of the second terminal block 320 is not limited to this and may be varied in design to have any shape of various shapes.

[0137] The second connector 320 may be integrally formed with the second electrode 220. For example, the second connector 320 may be the remaining area of ​​the second uncoated portion 222 after a portion of the second uncoated portion 222 has been cut or removed by a grooving process or the like. Alternatively, the second connector 320 may be manufactured separately from the second electrode 220 and then connected to the second uncoated portion 222 by welding or the like. The material of the second connector 320 may be the same as that of the second electrode 220.

[0138] The number of second tabs 320 may be the same as the number of second electrodes 220. Each second tab 320 may extend individually from a second uncoated portion 222 of one of the different second electrodes 220. Adjacent second tabs 320 may be arranged to face each other in a third-party direction. That is, a plurality of second tabs 320 may be arranged in a third-party direction. Adjacent second tabs 320 may be arranged in parallel. Therefore, according to some embodiments, the second tab member 302 may be an assembly of a plurality of second tabs 320 arranged in a third-party direction. Adjacent second tabs 320 may contact each other or be spaced apart from each other by the thickness of the diaphragm 230.

[0139] The cover assembly 400 can be attached to the housing 100 to seal the housing 100.

[0140] According to some embodiments, cover assembly 400 may include cover plate 410.

[0141] The cover plate 410 can form the rough exterior of the cover assembly 400.

[0142] According to some embodiments, the cover plate 410 may be formed to have a flat plate shape. The cover plate 410 may be located in the opening 160 of the housing 100. The cover plate 410 may be arranged to face the electrode assembly 200 in a first direction. That is, the cover plate 410 may be located at a position spaced apart from the electrode assembly 200 by a distance (e.g., a set or predetermined distance) in the first direction. The cover plate 410 may be arranged parallel to the bottom portion 110 of the housing 100.

[0143] The cover plate 410 may be disposed on the upper portion of the housing 100, for example, on the upper portion of the front portion 120, the rear portion 130, the first side portion 140, and the second side portion 150. The cover plate 410 may be connected to the housing 100 by any of a variety of connection methods such as welding, bolting, and assembly.

[0144] The cover plate 410 may include a first surface 411 facing the electrode assembly 200 in a first direction and a second surface 412 opposite to the first surface 411 (see...). Figure 5 The second surface 412 of the cover plate 410 can be configured to face the external space of the secondary battery 1.

[0145] According to some embodiments, the cover assembly 400 may further include an exhaust port 440 and an exhaust element 450.

[0146] According to some embodiments, the vent 440 may be formed as a hole shape having two surfaces of the cover plate 410 perpendicularly in a first direction. The vent 440 may be configured to provide a path through which flames, gases, smoke, etc., formed inside the housing 100 are discharged to the outside of the housing 100 in the event of thermal runaway in the secondary battery 1 due to overcurrent or the like. The vent 440 may be located in the central portion of the cover plate 410. The cross-sectional shape of the vent 440 may be designed to have any shape of various forms, such as elliptical, circular, or polygonal.

[0147] The vent 450 can be installed in the vent 440 and can be opened and closed in response to changes in the internal pressure of the housing 100. That is, when the secondary battery 1 is operating normally, the vent 450 can close the vent 440 to prevent the electrolyte inside the housing 100 from leaking to the outside of the housing 100, or to prevent moisture, foreign matter, etc. from flowing into the housing 100. When thermal runaway occurs in the secondary battery 1, the vent 450 can open the vent 440 to guide flames, gases, smoke, etc. formed inside the housing 100 to be discharged to the outside of the housing 100.

[0148] According to some embodiments, the vent 450 may be formed in a plate shape (or substantially plate shape). The vent 450 may be fixed to the cover plate 410 by any of a variety of connection methods such as welding, bolting, and assembly. The vent 450 may be located inside the vent hole 440, or arranged above or below the cover plate 410 facing the vent hole 440 in a first direction.

[0149] The thickness of the vent 450 in the first direction may be less than the thickness of the cover plate 410. Therefore, the vent 450 may easily rupture or break when the internal pressure of the housing 100 increases. The vent 450 may include a notch formed to be recessed inward from the vent 450 to preferentially rupture when the internal pressure of the housing 100 increases.

[0150] According to some embodiments, the cover assembly 400 may further include an electrolyte injection port formed through the cover plate 410 and on which a sealing plug may be mounted. The electrolyte injection port may be arranged to be spaced apart from the vent 440 by a distance (e.g., a set or predetermined distance) in a second direction or in a direction opposite to the second direction.

[0151] According to some embodiments, the cover assembly 400 may further include an insulating plate 470.

[0152] An insulating plate 470 may be located between the cover plate 410 and the electrode assembly 200. The insulating plate 470 prevents or reduces direct contact between the cover plate 410 and the electrode assembly 200, thereby insulating the cover plate 410 from the electrode assembly 200. The insulating plate 470 can secure the electrode assembly 200 inside the housing 100. When the cover plate 410 deforms inwards towards the housing 100 due to external impacts, the insulating plate 470 prevents or reduces damage to the electrode assembly 200.

[0153] According to some embodiments, the insulating plate 470 may be arranged inside the housing 100 facing the electrode assembly 200 in a first direction. That is, the electrode assembly 200, the insulating plate 470, and the cover plate 410 may be arranged sequentially in the first direction. The insulating plate 470 may be fixed to the inner surface of the housing 100 by any of a variety of connection methods such as assembly, welding, bolting, and bonding. The insulating plate 470 may contact one surface of the electrode assembly 200 from which the first terminal member 301 and the second terminal member 302 extend. The insulating plate 470 may be made of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or rubber.

[0154] The first current collector 500 may be located between the electrode assembly 200 and the cover plate 410 and connected to the first contact member 301. The first current collector 500 may be used as a component to electrically connect the first contact member 301 to the first terminal 600. The first current collector 500 may be made of a conductive material such as aluminum, copper, or nickel.

[0155] Figure 5 A schematic perspective view illustrating the configuration of the first current collector and the first terminal according to some embodiments of the present disclosure, Figure 6 for Figure 5 Exploded perspective view, Figure 7 for Figure 5 The main view, and Figure 8 for Figure 5 Cross-sectional view.

[0156] refer to Figures 1 to 8 According to some embodiments, the first current collector 500 may include a first current collector plate 510 and a first connecting member 520.

[0157] The first collector plate 510 may be arranged to face the first connector member 301 and may contact the first connector member 301.

[0158] According to some embodiments, the first collector plate 510 may include a first center plate 511 and a first extension plate 512.

[0159] The first center plate 511 can form the center of the first collector plate 510 and support the first extension plate 512.

[0160] According to some embodiments, a first center plate 511 may be located between the electrode assembly 200 and the cover plate 410. The first center plate 511 may be arranged to face the electrode assembly 200 in a first direction. As an example, the first center plate 511 may be arranged to face one surface of the electrode assembly 200 located between a pair of adjacent first terminal block members 301.

[0161] The two end portions of the first center plate 511 may extend toward the electrode assembly 200. The two end portions of the first center plate 511 may pass through the insulating plate 470 and may be located on the underside of the insulating plate 470.

[0162] The first extension plate 512 may extend from the first center plate 511 and may contact the first terminal piece 301.

[0163] According to some embodiments, a first extension plate 512 may extend from an end portion of a first center plate 511 in a direction parallel to a second direction. The first extension plate 512 may be arranged to face the first connector member 301 in a first direction. The first extension plate 512 may contact the end surface of the first connector member 301 that is arranged to face the cover plate 410.

[0164] A pair of first extension plates 512 may be provided. The pair of first extension plates 512 may extend from two end portions of the first center plate 511 in a second direction and in a direction opposite to the second direction, respectively. Each first extension plate 512 may individually contact the end surface of one of the different first terminal piece members 301.

[0165] The first connector component 301 and the first extension plate 512 can be joined together by laser welding.

[0166] The first connecting member 520 may be located between the first current collector 510 and the first terminal 600. The first connecting member 520 may support the first terminal 600 relative to the first current collector 510. That is, the first connecting member 520 may be used as a component to provide mechanical and electrical connection between the first current collector 510 and the first terminal 600.

[0167] According to some embodiments, the first connecting member 520 may have two end portions of a first support plate 610 that are respectively connected to the first center plate 511 and the first terminal 600.

[0168] A first bent portion 521 that movably supports the first terminal 600 relative to the first collector plate 510 may be formed on the central portion of the first connecting member 520.

[0169] Figure 9 To show Figure 8 A schematic diagram of the unfolded state of the first bend in the middle.

[0170] refer to Figure 8 and Figure 9 According to some embodiments, the first bent portion 521 can be bent clockwise or counterclockwise around a second direction, and the relative position of the first terminal 600 relative to the first current collector 510 can be adjusted. As an example, when the first bent portion 521 is in... Figure 8 When bent counterclockwise, the first current collector 510 and the first terminal 600 can be aligned in the first direction. Therefore, in the secondary battery 1 according to some embodiments, only the bending operation of the first bending portion 521 is required without additional bonding processes for the first current collector 510 and the first terminal 600, and the relative position of the first terminal 600 can be arranged relative to the first current collector 510. Figure 9 When the first bent portion 521 unfolds clockwise, the first terminal 600 can move outward from the first current collector 510, and the upper surface of the first current collector 510 can be opened. Therefore, when the first current collector 510 and the first terminal piece 301 are combined, the first bent portion 521 can prevent or reduce interference with the first terminal 600 from welding devices or other sources.

[0171] The first terminal 600 can extend from the first current collector 500 to the outside of the cover plate 410. The first terminal 600 can be used as a component to connect the secondary battery 1 to an external electrical device, such as another secondary battery 1, a busbar, etc.

[0172] The first terminal 600 may be provided as deformable. Therefore, the first terminal 600 can have an adjustable position or extension direction by deforming its own shape, and can be directly connected to the terminal of another secondary battery 1 or an external busbar. The first terminal 600 may be made of a conductive material such as copper, aluminum, or nickel. The material of the first terminal 600 may be the same as the material of the first current collector 500, or alternatively, may be a different material.

[0173] According to some embodiments, the first terminal 600 may include a first support plate 610 and a first bending plate 620.

[0174] The first support plate 610 may form one side of the exterior of the first terminal 600 and support the first bent plate 620. The first support plate 610 may be connected to the first current collector 500.

[0175] According to some embodiments, the first support plate 610 may be formed having a flat plate shape (or substantially flat plate shape). The first support plate 610 may be connected to the other end portion of the first connecting member 520 extending from the first center plate 511. The first support plate 610 may be manufactured separately from the first connecting member 520 and then connected to the first connecting member 520 by welding or the like. Alternatively, the first support plate 610 may be integrally formed with the first connecting member 520. The relative position of the first support plate 610 with respect to the first center plate 511 may be changed in conjunction with a bending operation of the first bending portion 521. When the first bending portion 521 is bent counterclockwise, the first support plate 610 may be arranged parallel in a first direction and facing the first center plate 511 (see...). Figure 8 ).

[0176] The first bending plate 620 may extend from the first support plate 610 and protrude outward from the cover plate 410.

[0177] According to some embodiments, the first bent plate 620 may be arranged to intersect with the first support plate 610. As an example, the first bent plate 620 may have a flat plate shape that extends from the first support plate 610 in the first direction, with the first support plate 610 arranged parallel to and facing the first center plate 511. The end portion of the first bent plate 620 may vertically pass through the first surface 411 and the second surface 412 of the cover plate 410 in the first direction and protrude into the outer space of the cover plate 410.

[0178] Figure 10 To show Figure 8 A schematic diagram showing the bent state of the first bending plate in the diagram.

[0179] refer to Figures 1 to 10 The first bending plate 620 is provided to be bendable about a second direction. By applying external force from a user, tool, etc., the first bending plate 620 can be bent clockwise or counterclockwise relative to any straight line parallel to the second direction. During the bending operation of the first bending plate 620, the end portion of the first bending plate 620 can protrude outward from the cover plate 410 in a third direction or in a direction opposite to the third direction. Therefore, the first bending plate 620 can contact and connect to an electrical device located outside the cover plate 410, such as the terminals of another secondary battery 1 or a busbar.

[0180] According to some embodiments, the first terminal 600 may further include a first notch 630.

[0181] The first notch 630 can be used as a component to guide the bending operation of the first bending plate 620.

[0182] According to some embodiments, the first notch 630 may have a groove shape, which is recessed from the end surface of the first bending plate 620 perpendicular to the second direction in a direction parallel to the second direction. The first notch 630 may extend through both surfaces of the first bending plate 620 in a third direction. In the region where the first notch 630 is formed, the length of the first bending plate 620 in the second direction may be relatively reduced. Therefore, the bending stress applied to the first bending plate 620 is concentrated on the first notch 630, and the bending operation of the first bending plate 620 can be performed continuously based on the first notch 630. The cross-sectional shape of the first notch 630 may be modified by design to have, except... Figure 7 Any shape other than the semicircular shape shown, such as polygons and ellipses.

[0183] A pair of first notches 630 may be provided. The pair of first notches 630 may be symmetrically arranged on both sides of the first bent plate 620. As an example, the pair of first notches 630 may be recessed from one end portion of the first bent plate 620 arranged facing the second direction in a direction opposite to the second direction, and the remaining first notches 630 may be recessed from the other end portion of the first bent plate 620 arranged facing the opposite direction in the second direction. The pair of first notches 630 may be configured to face each other in the second direction. That is, all centerlines of the pair of first notches 630 may be arranged on a straight line parallel to the second direction.

[0184] According to some embodiments, the secondary battery 1 may further include a first pad 601.

[0185] The first gasket 601 electrically insulates the cover plate 410 and the first terminal 600. The first gasket 601 prevents moisture or foreign matter from entering between the cover plate 410 and the first terminal 600. The first gasket 601 may be made of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or rubber. The first gasket 601 may be installed between the cover plate 410 and the first terminal 600 via insert injection molding.

[0186] According to some embodiments, the first liner 601 may include a first liner body 602, a first inner liner 603, and a first outer liner 604.

[0187] The first pad body 602 can form the center exterior of the first pad 601.

[0188] According to some embodiments, a first pad body 602 may vertically extend through a first surface 411 and a second surface 412 of a cover plate 410. One end portion of the first pad body 602 may protrude from the first surface 411 into the interior space of the housing 100 by a distance (e.g., a set or predetermined distance). The other end portion of the first pad body 602 may protrude from the second surface 412 into the exterior of the cover plate 410 by a distance (e.g., a set or predetermined distance). The first pad body 602 may be arranged to extend through the cover plate 410 and surround the lower end portion region of a first bent plate 620 located inside the cover plate 410.

[0189] The first inner liner 603 may be arranged to extend from the first liner body 602 and surround the first support plate 610.

[0190] According to some embodiments, a first inner liner 603 may be connected to an end portion of a first liner body 602 that protrudes into the interior space of the housing 100. The first inner liner 603 may be arranged to completely surround a first support plate 610 facing a first surface 411 of the cover plate 410. The cross-sectional area of ​​the first inner liner 603 perpendicular to the first direction may be larger than the cross-sectional area of ​​the first liner body 602 perpendicular to the first direction. The first inner liner 603 may contact the first surface 411 of the cover plate 410. Therefore, the first inner liner 603 may contact the first surface 411 to prevent or reduce the possibility of the first liner 601 separating from the cover plate 410 in the first direction.

[0191] The first outer liner 604 may be arranged to extend from the first liner body 602 and surround the first bent plate 620.

[0192] According to some embodiments, a first outer gasket 604 may be attached to the other end portion of the first gasket body 602 that protrudes outward from the cover plate 410. The first outer gasket 604 may be arranged to surround a first bent plate 620 that protrudes from a second surface 412 of the cover plate 410. The height of the first outer gasket 604 may be equal to or less than the height of the centerline of the first recess 630. Therefore, by exposing all or part of the first recess 630 to the outside, the first outer gasket 604 may not interfere with the bending operation of the first bent plate 620.

[0193] The cross-sectional area of ​​the first outer gasket 604 perpendicular to the first direction may be larger than the cross-sectional area of ​​the first gasket body 602 perpendicular to the first direction. The first outer gasket 604 may contact the second surface 412 of the cover plate 410. Therefore, the first outer gasket 604 may contact the second surface 412 to prevent or reduce the possibility of the first gasket 601 separating from the cover plate 410 in a direction opposite to the first direction.

[0194] Figure 11 A schematic plan view illustrating the arrangement relationship between a first bent plate and a first liner according to some embodiments of the present disclosure.

[0195] refer to Figure 11 The distance A1 from the first bent plate 620 to the outer peripheral surface of the first outer liner 604 can be 3 mm or more. When the distance A1 from the first bent plate 620 to the outer peripheral surface of the first outer liner 604 is less than 3 mm, sufficient electrical insulation between the cover plate 410 and the first terminal 600 cannot be ensured. Various designs are possible within the range where the distance A1 from the first bent plate 620 to the outer peripheral surface of the first outer liner 604 is 3 mm or more and less than the distance from the first bent plate 620 to the edge of the cover plate 410.

[0196] The ratio (L1 / L0) of the protruding length L1 of the first bent plate 620 to the width L0 of the cover plate 410 can be 0.5 or more and 1 or less. Here, when the first bent plate 620 is arranged parallel to the first direction, the protruding length L1 of the first bent plate 620 can be the length from the upper surface of the first outer liner 604 or the center line of the first recess 630 to the end portion of the first bent plate 620. When the ratio (L1 / L0) of the protruding length L1 of the first bent plate 620 to the width L0 of the cover plate 410 is less than 0.5, the length of the first bent plate 620 is too small, and therefore a smooth connection with adjacent electrical devices cannot be achieved. When the ratio (L1 / L0) of the protruding length L1 of the first bent plate 620 to the width L0 of the cover plate 410 is greater than 1, the length of the first bent plate 620 is too long, and there is a concern that the first bent plate 620 may interfere with adjacent components.

[0197] According to some embodiments, the first terminal 600 may further include a first connection hole 640.

[0198] The first connecting hole 640 can be used as a component to enhance the connection strength between the first bent plate 620 and the first gasket 601.

[0199] According to some embodiments, the first connection hole 640 may have a hole shape extending through both surfaces of the first bent plate 620 in a third direction. A first gasket 601, such as a first outer gasket 604 surrounding the first bent plate 620, may be inserted into the first connection hole 640. Thus, the first terminal 600 is connected by being engaged with the first gasket 601 in a direction intersecting the first direction, and relative movement of the first terminal 600 relative to the first gasket 601 is prevented or reduced.

[0200] The first connecting hole 640 may be arranged to face the first recess 630 in a second direction. As an example, the first connecting hole 640 may be arranged between a pair of first recesses 630. Therefore, the first connecting hole 640 may enhance the connection strength between the first bending plate 620 and the first gasket 601, while guiding the bending operation of the first bending plate 620 together with the first recesses 630.

[0201] Multiple first connection holes 640 may be provided. The multiple first connection holes 640 may be arranged at predetermined intervals in a second direction.

[0202] According to some embodiments, the first terminal 600 may further include a first alignment hole 650.

[0203] The first alignment hole 650 can be used to indicate the position of the tool used to secure the first terminal 600 during the insert injection molding of the first pad 601 or the connection process between the first terminal 600 and an external electrical device.

[0204] According to some embodiments, the first alignment hole 650 may have a hole shape extending through both surfaces of the first bent plate 620 in a third-order direction. The height of the first alignment hole 650 may be greater than the height of the first notch 630 and the first connecting hole 640. That is, the first alignment hole 650 may be positioned relatively closer to the end portion of the first bent plate 620 than the first notch 630 and the first connecting hole 640.

[0205] According to some embodiments, the secondary battery 1 may further include a second current collector 700 and a second terminal 800.

[0206] The second current collector 700 may be disposed between the electrode assembly 200 and the cover plate 410 and connected to the second contact member 302. The second current collector 700 may serve as a component for electrically connecting the second contact member 302 to the second terminal 800. The second current collector 700 may be made of a conductive material such as aluminum, copper, or nickel. The first current collector 500 and the second current collector 700 may be arranged to be spaced apart from each other by a distance (e.g., a set or predetermined distance) in a second direction.

[0207] Figure 12 A schematic perspective view illustrating the configuration of the second current collector and the second terminal according to some embodiments of the present disclosure, Figure 13 for Figure 12 Exploded perspective view, Figure 14 for Figure 12 The main view, and Figure 15 for Figure 12 Cross-sectional view.

[0208] refer to Figures 12 to 15 According to some embodiments, the second current collector 700 may include a second current collector plate 710 and a second connecting member 720.

[0209] The second collector plate 710 may be arranged to face the second connector member 302 and may contact the second connector member 302.

[0210] According to some embodiments, the second collector plate 710 may include a second center plate 711 and a second extension plate 712.

[0211] The second center plate 711 can form the center exterior of the second collector plate 710 and support the second extension plate 712.

[0212] According to some embodiments, a second center plate 711 may be disposed between the electrode assembly 200 and the cover plate 410. The second center plate 711 may be disposed facing the electrode assembly 200 in a first direction. As an example, the second center plate 711 may be disposed facing one surface of the electrode assembly 200 located between a pair of adjacent second terminal block members 302.

[0213] The two end portions of the second center plate 711 may extend toward the electrode assembly 200. The two end portions of the second center plate 711 may pass through the insulating plate 470 and may be located on the underside of the insulating plate 470.

[0214] The second extension plate 712 can extend from the second center plate 711 and can contact the second terminal piece 302.

[0215] According to some embodiments, a second extension plate 712 may extend from an end portion of the second center plate 711 in a direction parallel to a second direction. The second extension plate 712 may be arranged to face the second connector member 302 in a first direction. The second extension plate 712 may contact the end surface of the second connector member 302 that is arranged to face the cover plate 410.

[0216] A pair of second extension plates 712 may be provided. The pair of second extension plates 712 may extend from two end portions of the second center plate 711 in a second direction and in a direction opposite to the second direction, respectively. Each second extension plate 712 may individually contact the end surface of one of the different second terminal members 302.

[0217] The second connector component 302 and the second extension plate 712 can be joined by laser welding.

[0218] The second connecting member 720 may be located between the second current collector 710 and the second terminal 800. The second connecting member 720 may support the second terminal 800 relative to the second current collector 710. That is, the second connecting member 720 may be used as a component to provide mechanical and electrical connection between the second current collector 710 and the second terminal 800.

[0219] According to some embodiments, the second connecting member 720 may have two end portions of a second support plate 810 that are respectively connected to the second center plate 711 and the second terminal 800.

[0220] A second bent portion 721, which movably supports the second terminal 800 relative to the second collector plate 710, may be formed on the central portion of the second connecting member 720.

[0221] According to some embodiments, the second bent portion 721 can be bent clockwise or counterclockwise around a second direction, and the relative position of the second terminal 800 with respect to the second current collector 710 can be adjusted. As an example, when the second bent portion 721 is in... Figure 15 When bent clockwise, the second current collector 710 and the second terminal 800 can be aligned in the first direction. Therefore, according to some embodiments, the secondary battery 1 can align the relative position of the second terminal 800 with respect to the second current collector 710 using only the bending operation of the second bending portion 721, without requiring additional bonding processes for the second current collector 710 and the second terminal 800. Figure 15 When the second bent portion 721 unfolds counterclockwise, the second terminal 800 can move outward from the second current collector 710, and the upper surface of the second current collector 710 can be opened. Therefore, when the second current collector 710 and the second terminal piece 302 are combined, the second bent portion 721 can prevent or reduce interference with the second terminal 800 from welding devices or other sources.

[0222] The second terminal 800 can extend from the second current collector 700 to the outside of the cover plate 410. The second terminal 800 can be used as a component to connect the secondary battery 1 to an external electrical device, such as another secondary battery 2, a busbar, etc.

[0223] The second terminal 800 may be provided as deformable. Therefore, the second terminal 800 can have an adjustable position or extension direction by deforming its own shape, and can be directly connected to the second terminal 800 of another secondary battery 1, the first terminal 600, or an external busbar. The second terminal 800 may be made of a conductive material such as copper, aluminum, or nickel. The material of the second terminal 800 may be the same as the material of the second current collector 700, or alternatively, may be different from the material of the second current collector 700. The first terminal 600 and the second terminal 800 may be arranged to be spaced apart from each other by a distance (e.g., a set or predetermined distance) in a second direction on the cover plate 410.

[0224] According to some embodiments, although examples have been described in which both the first terminal 600 and the second terminal 800 are deformable, this disclosure is not limited thereto, and only the first terminal 600 or the second terminal 800 may be formed to be deformable.

[0225] According to some embodiments, the second terminal 800 may include a second support plate 810 and a second bending plate 820.

[0226] The second support plate 810 may form one side of the exterior of the second terminal 800 and support the second bent plate 820. The second support plate 810 may be connected to the second current collector 700.

[0227] According to some embodiments, the second support plate 810 may be formed to have a flat plate shape (or substantially flat plate shape). The second support plate 810 may be connected to the other end portion of the second connecting member 720 extending from the second center plate 711. The second support plate 810 may be manufactured separately from the second connecting member 720 and then connected to the second connecting member 720 by welding or the like. Alternatively, the second support plate 810 may be integrally formed with the second connecting member 720. The relative position of the second support plate 810 with respect to the second center plate 711 may be changed in conjunction with the bending operation of the second bending portion 721. When the second bending portion 721 is fully bent clockwise (see...),... Figure 15 The second support plate 810 can be arranged to be parallel in the first direction and facing the second center plate 711.

[0228] The second bending plate 820 may extend from the second support plate 810 and protrude outward from the cover plate 410.

[0229] According to some embodiments, the second bent plate 820 may be arranged to intersect with the second support plate 810. As an example, the second bent plate 820 may have a flat plate shape that extends from the second support plate 810 in the first direction, with the second support plate 810 arranged parallel to and facing the second center plate 711. The end portion of the second bent plate 820 may vertically pass through the first surface 411 and the second surface 412 of the cover plate 410 in the first direction and protrude into the outer space of the cover plate 410.

[0230] The second bending plate 820 can be provided to be bent around the second direction. By applying external force from a user, tool, etc., the second bending plate 820 can be bent clockwise or counterclockwise relative to any straight line parallel to the second direction. During the bending operation of the second bending plate 820, the end portion of the second bending plate 820 can protrude outward from the cover plate 410 in a third direction or in a direction opposite to the third direction. Therefore, the second bending plate 820 can contact and connect to an electrical device located outside the cover plate 410, such as the terminals of another secondary battery 1 or a busbar.

[0231] According to some embodiments, the second terminal 800 may further include a second notch 830.

[0232] The second notch 830 can be used as a component to guide the bending operation of the second bending plate 820.

[0233] According to some embodiments, the second notch 830 may have a groove shape, which is recessedly formed from the end surface of the second bending plate 820 perpendicular to the second direction in a direction parallel to the second direction. The second notch 830 may extend through both surfaces of the second bending plate 820 in a third direction. In the region where the second notch 830 is formed, the length of the second bending plate 820 in the second direction may be relatively reduced. Therefore, the bending stress applied to the second bending plate 820 is concentrated on the second notch 830, and the bending operation of the second bending plate 820 can be performed based on the second notch 830. The cross-sectional shape of the second notch 830 may be modified by design to have, except... Figure 14 Any shape other than the semicircular shape shown, such as polygons and ellipses.

[0234] A pair of second notches 830 may be provided. The pair of second notches 830 may be symmetrically arranged on both sides of the second bent plate 820. As an example, the pair of second notches 830 may be recessed from one end portion of the second bent plate 820 facing the second direction in a direction opposite to the second direction, and the remaining second notches 830 may be recessed from the other end portion of the second bent plate 820 facing the opposite direction in the second direction. The pair of second notches 830 may be arranged to face each other in the second direction. That is, all centerlines of the pair of second notches 830 may be arranged on a straight line parallel to the second direction.

[0235] According to some embodiments, the secondary battery 1 may further include a second pad 801.

[0236] The second gasket 801 electrically insulates the cover plate 410 and the second terminal 800. The second gasket 801 prevents moisture or foreign matter from entering between the cover plate 410 and the second terminal 800. The second gasket 801 may be made of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or rubber. The second gasket 801 may be installed between the cover plate 410 and the second terminal 800 via insert injection molding.

[0237] According to some embodiments, the second liner 801 may include a second liner body 802, a second inner liner 803, and a second outer liner 804.

[0238] The second pad body 802 can form the center outside of the second pad 801.

[0239] According to some embodiments, a second liner body 802 may vertically extend through a first surface 411 and a second surface 412 of a cover plate 410. One end portion of the second liner body 802 may protrude from the first surface 411 at a distance (e.g., a set or predetermined distance) into the interior space of the housing 100. The other end portion of the second liner body 802 may protrude from the second surface 412 at a distance (e.g., a set or predetermined distance) into the exterior of the cover plate 410. The second liner body 802 may be arranged to extend through the cover plate 410 and surround the lower end portion region of a second bent plate 820 located inside the cover plate 410.

[0240] The second inner liner 803 may be arranged to extend from the second liner body 802 and surround the second support plate 810.

[0241] According to some embodiments, a second inner liner 803 may be connected to one end portion of the second liner body 802 that protrudes into the interior space of the housing 100. The second inner liner 803 may be arranged to completely surround the second support plate 810 facing the first surface 411 of the cover plate 410. The cross-sectional area of ​​the second inner liner 803 perpendicular to the first direction may be larger than the cross-sectional area of ​​the second liner body 802 perpendicular to the first direction. The second inner liner 803 may contact the first surface 411 of the cover plate 410. Therefore, the second inner liner 803 may contact the first surface 411 to prevent or reduce the possibility of the second liner 801 separating from the cover plate 410 in the first direction.

[0242] The second outer liner 804 may be arranged to extend from the second liner body 802 and surround the second bent plate 820.

[0243] According to some embodiments, a second outer gasket 804 may be connected to another end portion of a second gasket body 802 that protrudes outward from the cover plate 410. The second outer gasket 804 may be arranged to surround a second bent plate 820 that protrudes from a second surface 412 of the cover plate 410. The height of the second outer gasket 804 may be equal to or less than the height of the centerline of the second recess 830. Therefore, by exposing all or part of the second recess 830 to the outside, the second outer gasket 804 may not interfere with the bending operation of the second bent plate 820.

[0244] The cross-sectional area of ​​the second outer gasket 804 perpendicular to the first direction may be larger than the cross-sectional area of ​​the second gasket body 802 perpendicular to the first direction. The second outer gasket 804 may contact the second surface 412 of the cover plate 410. Therefore, the second outer gasket 804 may contact the second surface 412 to prevent or reduce the possibility of the second gasket 801 separating from the cover plate 410 in a direction opposite to the first direction.

[0245] Figure 16 A schematic plan view illustrating the arrangement between the second bent plate and the second liner according to an embodiment of the present disclosure.

[0246] refer to Figure 16 The distance A2 from the second bent plate 820 to the outer peripheral surface of the second outer liner 804 can be 3 mm or more. When the distance A2 from the second bent plate 820 to the outer peripheral surface of the second outer liner 804 is less than 3 mm, sufficient electrical insulation between the cover plate 410 and the second terminal 800 cannot be ensured. Various designs are possible within the range where the distance A2 from the second bent plate 820 to the outer peripheral surface of the second outer liner 804 is 3 mm or more and less than the distance from the edge of the second bent plate 820 to the cover plate 410.

[0247] The ratio (L2 / L0) of the protruding length L2 of the second bent plate 820 to the width L0 of the cover plate 410 can be 0.5 or more and 1 or less. Here, when the second bent plate 820 is arranged parallel to the first direction, the protruding length L2 of the second bent plate 820 can be the length from the upper surface of the second outer gasket 804 or the center line of the second recess 830 to the end portion of the second bent plate 820. When the ratio (L2 / L0) of the protruding length L2 of the second bent plate 820 to the width L0 of the cover plate 410 is less than 0.5, the length of the second bent plate 820 is too small, and therefore a smooth connection with adjacent electrical devices cannot be achieved. When the ratio (L2 / L0) of the protruding length L2 of the second bent plate 820 to the width L0 of the cover plate 410 is greater than 1, the length of the second bent plate 820 is too long, and there is concern that the second bent plate 820 may interfere with adjacent components.

[0248] The protruding length L2 of the second bending plate 820 may be the same as or different from the protruding length L1 of the first bending plate 620.

[0249] According to some embodiments, the second terminal 800 may further include a second connection hole 840.

[0250] The second connection hole 840 can be used to indicate the location for strengthening the connection between the second bent plate 820 and the second gasket 801.

[0251] According to some embodiments, the second connection hole 840 may have a hole shape extending through both surfaces of the second bent plate 820 in a third-direction direction. A second gasket 801, such as a second outer gasket 804 surrounding the second bent plate 820, may be inserted into the second connection hole 840. Therefore, the second terminal 800 is connected by being engaged with the second gasket 801 in a direction intersecting the first direction, and relative movement of the second terminal 800 relative to the second gasket 801 can be prevented or reduced.

[0252] The second connecting hole 840 may be arranged to face the second recess 830 in a second direction. As an example, the second connecting hole 840 may be located between a pair of second recesses 830. Therefore, the second connecting hole 840 may enhance the connection strength between the second bending plate 820 and the second gasket 801, while guiding the bending operation of the second bending plate 820 together with the second recesses 830.

[0253] Multiple second connection holes 840 may be provided. The multiple second connection holes 840 may be arranged at predetermined intervals in a second direction.

[0254] According to some embodiments, the second terminal 800 may further include a second alignment hole 850.

[0255] The second alignment hole 850 can be used to indicate the position of the tool used to secure the second terminal 800 during the insert injection molding of the second pad 801 or the connection process between the second terminal 800 and an external electrical device.

[0256] According to some embodiments, the second alignment hole 850 may have a hole shape extending through both surfaces of the second bent plate 820 in a third-order direction. The height of the second alignment hole 850 may be greater than the height of the second recess 830 and the second connecting hole 840. That is, the second alignment hole 850 may be located at a position relatively closer to the end portion of the second bent plate 820 than the second recess 830 and the second connecting hole 840.

[0257] According to some embodiments, the secondary battery 1 may further include an insulating member 900.

[0258] The insulating member 900 may be arranged around the housing 100 and the cover plate 410. The insulating member 900 may be made of an insulating material such as polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), or rubber. Therefore, the insulating member 900 can be used as a component to ensure the external insulation of the secondary battery 1.

[0259] According to some embodiments, the insulating member 900 may include a first insulating member 910 and a second insulating member 920.

[0260] The first insulating member 910 may be arranged to surround the housing 100. According to some embodiments, the first insulating member 910 may be arranged to completely cover the outer surfaces of the bottom portion 110, front portion 120, rear portion 130, first side portion 140, and second side portion 150 of the housing 100. The first insulating member 910 may be fixed to the outer surface of the housing 100 by any of a variety of connection methods such as bonding and pressing methods.

[0261] The second insulating member 920 may be arranged to extend from the first insulating member 910 and surround the cover plate 410. According to some embodiments, the second insulating member 920 may extend from the upper end portion of the first insulating member 910 parallel to the cover plate 410. The second insulating member 920 may be configured to cover the edge region of the second surface 412 of the cover plate 410. The second insulating member 920 may be secured to the second surface 412 of the cover plate 410 by any of a variety of connection methods, such as bonding and pressing methods. Therefore, the first insulating member 910 and the second insulating member 920 may be arranged to completely surround the joint portion of the housing 100 and the cover plate 410, thereby further enhancing the connection strength between the housing 100 and the cover plate 410.

[0262] The width B of the second insulating member 920 on the second surface 412 of the cover plate 410 can be 1 mm or more. Here, the width B of the second insulating member 920 can be the gap between the outer peripheral surface and the inner peripheral surface of the second insulating member 920, parallel to a second or third direction. Various designs are possible within the range where the width B of the second insulating member 920 is 1 mm or more and the second insulating member 920 does not directly contact the first gasket 601 and the second gasket 801.

[0263] The following describes a battery pack according to some embodiments of the present disclosure.

[0264] Figure 17 A schematic perspective view illustrating the configuration of a battery pack according to some embodiments of the present disclosure, and Figure 18 A schematic enlarged view illustrating the electrical connection configuration of a battery pack according to some embodiments of the present disclosure.

[0265] refer to Figures 1 to 18 According to some embodiments, the battery pack may include a secondary battery 1, a housing 2, and a retainer 3.

[0266] Secondary battery 1 can be with Figures 1 to 16 It is configured in the same way as the secondary battery 1 described in the text.

[0267] The housing 2 can form a rough exterior of the battery pack and provide space to accommodate the secondary battery 1.

[0268] According to some embodiments, the housing 2 may include a housing body 21 and a cover 22.

[0269] The outer casing 21 can be formed into a box shape that is hollow and has an open side. The cross-sectional shape of the outer casing 21 is not limited to... Figure 17 The quadrilateral shape shown in the figure can be modified in design to have any shape with various shapes such as polygons, circles and ellipses.

[0270] The cover 22 can be attached to the housing body 21 and can close the interior space of the housing body 21. For example, the cover 22 can be formed in a plate shape (or substantially plate shape) and arranged facing the open side of the housing body 21. The cover 22 can be secured to the housing body 21 by any of a variety of connection methods such as bolting, welding and assembly.

[0271] Multiple secondary batteries 1 may be provided in a battery pack according to some embodiments. The multiple secondary batteries 1 may be arranged in two or more columns in at least one of the longitudinal direction (i.e., the third direction) and the width direction (i.e., the second direction) of the housing 2. Although Figure 17An example is shown of multiple secondary batteries 1 arranged in eight columns in a third-order orientation, but the arrangement of the multiple secondary batteries 1 is not limited to this and can be changed in design to any form with various configurations. The multiple secondary batteries 1 can be arranged in parallel. The number of secondary batteries 1 can be changed in various ways in design depending on the size, shape, etc., of the housing 2.

[0272] The holder 3 can support the substrate, sensor, etc., and is used to measure the voltage and temperature of the secondary battery 1 inside the housing 2.

[0273] According to some embodiments, the retainer 3 may be formed in a flat plate shape. The retainer 3 may be located between the cover 22 and the secondary battery 1. The retainer 3 may comprise an electrically insulating polymer composite material.

[0274] The retainer 3 may have a retainer vent 32 arranged to face the vent 440 of the secondary battery 1. Multiple retainer vents 32 may be provided and arranged in a third-party direction. Each retainer vent 32 may be individually arranged to face a different vent 440 of the secondary battery 1.

[0275] Terminal holes 31 into which the first terminal 600 and the second terminal 800 of the secondary battery 1 are inserted can be formed in the retainer 3. Multiple terminal holes 31 can be provided. The multiple terminal holes 31 can be individually arranged at the positions where the first terminal 600 and the second terminal 800 of one of the different secondary batteries 1 can be inserted.

[0276] According to some embodiments, the first terminal 600 of one of a pair of adjacent secondary batteries 1 and the second terminal 800 of the other secondary battery 1 may be arranged to face each other in a third-party upward direction. The front portion 120 of one of the adjacent secondary batteries 1 may be arranged to face the rear portion 130 of the other secondary battery 1. Therefore, according to some embodiments, the first terminal 600 and the second terminal 800 of different secondary batteries 1 may be arranged alternately in a third-party upward direction.

[0277] According to some embodiments, the first terminal 600 of one of the secondary batteries 1 arranged adjacent to each other can be directly connected to the second terminal 800 of the other secondary battery 1.

[0278] For example, the first bending plate 620 of the first terminal 600 of one of the adjacent secondary batteries 1 can be bent toward the second terminal 800 of the other secondary battery 1 in a second direction. In addition, the second bending plate 820 of the second terminal 800 of the other of a pair of adjacent secondary batteries 1 can be bent toward the first terminal 600 of one of the pairs of secondary batteries 1 in a second direction.

[0279] A first bent plate 620 of one of a pair of adjacent secondary batteries 1 can be in electrical contact with a second bent plate 820 of the other. The first bent plate 620 of one of the adjacent secondary batteries 1 and the second bent plate 820 of the other can be electrically and mechanically connected by any of various types of connection methods such as welding and bolting. Therefore, according to some embodiments, the battery pack can electrically connect a pair of adjacent secondary batteries 1 without a busbar, thereby relatively reducing the number of parts and relatively lowering manufacturing costs.

[0280] However, this disclosure is not limited thereto, and the first terminal 600 of one of a pair of adjacent secondary batteries 1 and the second terminal 800 of the other secondary battery 1 may be arranged to face each other in the longitudinal direction of the housing 2. In this case, for example, the first terminal 600 of one of the pair of adjacent secondary batteries 1 may be connected to the first terminal 600 of the other secondary battery 1.

[0281] According to some embodiments of this disclosure, because the terminals of different secondary batteries can be directly connected without a busbar by deforming a terminal extending outward from the cover plate, the number of parts used for electrical connection can be relatively reduced, the contact resistance between parts can be reduced, and the manufacturing cost can be relatively reduced.

[0282] However, the features of the embodiments according to this disclosure are not limited to those described above, and other technical effects not mentioned will be clearly understood by those skilled in the art from the following description of this disclosure.

[0283] While aspects of some embodiments of this disclosure have been described with reference to the accompanying drawings, these embodiments are merely illustrative, and it should be understood that various modifications and equivalent other embodiments can be derived by those skilled in the art based on the embodiments.

Claims

1. A secondary battery, comprising: case; An electrode assembly is located inside the housing and has a first electrode and a second electrode. A first terminal component is connected to the first electrode and extends from the electrode assembly; A cover plate is attached to the housing and faces the electrode assembly; A first current collector is located between the electrode assembly and the cover plate and is connected to the first terminal piece member; as well as The first terminal extends from the first current collector and is configured to be deformable.

2. The secondary battery according to claim 1, wherein the first terminal comprises: A first support plate is connected to the first current collector; as well as A first bent plate extends from the first support plate in a first direction and protrudes outward from the cover plate, and The first bending plate is bendable around a second direction that intersects with the first direction.

3. The secondary battery according to claim 2, wherein the first support plate and the first bending plate intersect each other.

4. The secondary battery according to claim 2, wherein the ratio of the protruding length of the first bent plate to the width of the cover plate is 0.5 or more and 1 or less.

5. The secondary battery according to claim 2, wherein the first terminal further includes a first notch, the first notch being recessedly formed from the first bent plate in a direction parallel to the second direction.

6. The secondary battery according to claim 5, wherein the first notch is on each of the two sides of the first bent plate.

7. The secondary battery according to claim 2, wherein the first current collector comprises: The first current collector faces the first terminal block component and is in contact with the first terminal block component; as well as A first connecting member is located between the first current collector and the first terminal, and supports the first terminal relative to the first current collector.

8. The secondary battery of claim 7, wherein the first connecting member includes a first bent portion that is bendable about the second direction.

9. The secondary battery according to claim 2, further comprising a first gasket between the cover plate and the first terminal.

10. The secondary battery of claim 9, wherein the first pad comprises: The first gasket body passes through the cover plate; A first inner liner extends from the first liner body and surrounds the first support plate; as well as A first outer liner extends from the first liner body and surrounds the first bent plate.

11. The secondary battery according to claim 10, wherein the distance from the first bent plate to the outer peripheral surface of the first outer liner is 3 mm or more.

12. The secondary battery according to claim 10, wherein the cross-sectional area of ​​the first inner liner and the first outer liner perpendicular to the first direction is greater than the cross-sectional area of ​​the first liner body perpendicular to the first direction.

13. The secondary battery of claim 12, wherein the first inner liner contacts the first surface of the cover plate, and The first outer liner contacts the second surface of the cover plate, which is opposite to the first surface.

14. The secondary battery of claim 9, wherein the first terminal further includes a first connection hole, the first connection hole passing through the first bent plate and the first gasket inserted into the first connection hole.

15. The secondary battery of claim 14, wherein the first terminal further includes a first notch, the first notch being recessedly formed from the first bent plate in a direction parallel to the second direction, and The first connecting hole faces the first notch in the second direction.

16. The secondary battery according to claim 1, further comprising: A second terminal component is connected to the second electrode and extends from the electrode assembly; A second current collector is located between the electrode assembly and the cover plate, and is connected to the second terminal piece component; as well as The second terminal extends from the second current collector and is provided to be deformable.

17. The secondary battery of claim 16, wherein the first terminal member and the second terminal member extend from the electrode assembly in a first direction.

18. The secondary battery of claim 1, further comprising an insulating member surrounding the housing and the cover plate.

19. A battery pack, comprising: shell; as well as A plurality of secondary batteries according to any one of claims 1 to 15 and 18 are located inside the housing.

20. The battery pack of claim 19, wherein the secondary battery further comprises a second terminal connected to the second electrode and spaced apart from the first terminal, and The first terminal of one secondary battery is directly connected to the first terminal or the second terminal of another secondary battery.

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