Rechargeable battery and battery pack comprising a rechargeable battery

Abstract

Batteries and battery packs are provided. The battery includes a housing, an electrode assembly inside the housing, the electrode assembly including an electrode, a tab member connected to the electrode, the tab member extending from the electrode assembly, a cover assembly facing the electrode assembly, the cover assembly having a terminal, and a current collector assembly between the electrode assembly and the cover assembly, wherein the current collector assembly includes a current collector plate bonded to the tab member and a flexible current collector electrically connecting the current collector plate and the terminal.

Description

Technical Field

[0001] This disclosure relates to rechargeable batteries and battery packs including rechargeable batteries. Background Technology

[0002] Unlike primary batteries, which cannot be recharged, rechargeable batteries are batteries that can be charged and discharged. Low-capacity rechargeable batteries are used in portable small electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity rechargeable batteries are widely used as power sources for motor drives in hybrid vehicles, electric vehicles, and for energy storage. These rechargeable batteries include electrodes containing positive and / or negative electrodes, electrode assemblies including the electrodes, a housing containing the electrode assemblies, and electrode terminals connected to the electrode assemblies.

[0003] With technological advancements, there is a demand for high-capacity rechargeable batteries. Therefore, multiple rechargeable batteries can be used by being electrically connected. For example, rechargeable batteries can be applied to electronic devices in the form of rechargeable battery modules comprising multiple rechargeable batteries and / or rechargeable battery packs comprising multiple rechargeable battery modules. Rechargeable battery packs can be configured to include multiple rechargeable batteries. In this case, the electronic device requires high output and / or high capacity and includes, for example, electric vehicles.

[0004] Rechargeable batteries typically include an electrode assembly in which positive electrodes, a separator, and negative electrodes are alternately arranged. The electrode assembly is housed inside a casing. Multiple positive and multiple negative electrodes forming the electrode assembly (hereinafter referred to as "electrodes") are electrically connected to the outside via positive electrode terminals and negative electrode terminals (hereinafter referred to as "electrode terminals"), respectively. That is, the multiple positive electrode terminals and multiple negative electrode terminals are electrically connected to positive and negative electrode terminals (hereinafter referred to as "electrode terminals") mounted on a cover plate, respectively.

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

[0006] The embodiment includes a battery comprising: a housing; an electrode assembly inside the housing, the electrode assembly including electrodes; a terminal piece connected to the electrodes, the terminal piece extending from the electrode assembly; a cover assembly facing the electrode assembly, the cover assembly having terminals; and a current collector assembly between the electrode assembly and the cover assembly, wherein the current collector assembly includes a current collector plate coupled to the terminal piece and a flexible current collector electrically connecting the current collector plate and the terminals.

[0007] The flexible current collector may include: a body portion comprising a flexible material; a first bonding portion extending from one end of the body portion and bonding to a current collector plate; and a second bonding portion extending from the other end of the body portion and bonding to a terminal.

[0008] The main body may include a metal wire bundle.

[0009] Metal wire harnesses can be braided.

[0010] The first connecting part and the manifold can be joined together in a concave-convex joint manner.

[0011] The first connecting portion may include a first connecting hole, and the manifold may include a first connecting protrusion connected in the first connecting hole.

[0012] The second mating part and the terminal can be engaged with each other in a concave-convex mating manner.

[0013] The second mating portion may include a second mating hole, and the terminal may include a second mating protrusion mating in the second mating hole.

[0014] The virtual straight line connecting the first and second joints may not be parallel to the extension direction of the terminal block component.

[0015] The embodiment includes a battery comprising: a housing; an electrode assembly disposed within the housing, the electrode assembly including electrodes; a terminal piece connected to the electrodes and extending from the electrode assembly; a cover assembly facing the electrode assembly, the cover assembly having terminals; and a current collector assembly between the electrode assembly and the cover assembly, the current collector assembly being electrically connected to the terminal piece and the terminals, wherein the current collector assembly includes: a current collector plate including a first sub-plate and a second sub-plate, the first sub-plate having a first surface not bonded to the terminal piece, the second sub-plate extending from at least one side of the first sub-plate, the second sub-plate having a first surface bonded to the terminal piece; and a flexible current collector bonded to a second surface side of the first sub-plate to electrically connect the current collector plate to the terminals.

[0016] The flexible current collector may include: a body portion comprising a flexible material; a first bonding portion extending from one end of the body portion and bonding to a second surface side of a first subplate; and a second bonding portion extending from the other end of the body portion and bonding to a terminal.

[0017] The main body may include a metal wire bundle.

[0018] Metal wire harnesses can be braided.

[0019] The first connecting part and the second sub-plate can be joined together in a concave-convex joint manner.

[0020] The first mating portion may include a first mating hole, and the first sub-plate may include a first mating protrusion mated in the first mating hole.

[0021] The second mating part and the terminal can be engaged with each other in a concave-convex mating manner.

[0022] The second mating portion may include a second mating hole, and the terminal may include a second mating protrusion mating in the second mating hole.

[0023] The virtual straight line connecting the first and second joints may not be parallel to the extension direction of the terminal block component.

[0024] The embodiment includes a battery pack comprising a housing and a plurality of batteries inside the housing, wherein each of the plurality of batteries includes: a casing; an electrode assembly inside the casing, the electrode assembly including electrodes; a terminal piece connected to the electrodes, the terminal piece extending from the electrode assembly; a cover assembly facing the electrode assembly, the cover assembly having terminals; and a current collector assembly between the electrode assembly and the cover assembly, wherein the current collector assembly includes a current collector plate coupled to the terminal piece and a flexible current collector electrically connecting the current collector plate and the terminals.

[0025] The current collector may include a first sub-plate and a second sub-plate, the first sub-plate having a first surface not bonded to a terminal block member, the second sub-plate extending from the first sub-plate on at least one side of the first sub-plate, the second sub-plate having a first surface bonded to a terminal block member, and a flexible current collector may be bonded to a second surface side of the first sub-plate to electrically connect the current collector to a terminal. Attached Figure Description

[0026] Features will become apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which:

[0027] Figure 1 This is a perspective view schematically illustrating the configuration of a battery pack according to one or more embodiments of the present disclosure;

[0028] Figure 2 This is a perspective view schematically illustrating the configuration of a battery according to one or more embodiments of the present disclosure;

[0029] Figure 3 It is shown schematically. Figure 2 An exploded perspective view of the battery configuration;

[0030] Figure 4 It is shown schematically. Figure 2 A cross-sectional view of the battery configuration.

[0031] Figure 5 yes Figure 4An enlarged view of the V portion in the cross-sectional diagram;

[0032] Figure 6 It is schematically shown that includes Figure 2 A diagram showing the configuration of the electrode components in the battery; and

[0033] Figure 7 This is a diagram illustrating an example of a current collector according to one or more embodiments of the present disclosure. Detailed Implementation

[0034] In the following, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in this specification and claims should not be construed as limited to their general or dictionary meanings, but should be interpreted as meanings and concepts consistent with the technical spirit of the present disclosure, based on the principle that the inventor is able to appropriately define the concepts of the terms in order to best describe his or her disclosure. Therefore, it should be understood that the embodiments described herein and the configurations shown in the figures are merely some of the exemplary embodiments of the present disclosure and do not represent all the technical spirit of the present disclosure, and various equivalents and modifications that can replace them may exist at the time of submission.

[0035] Furthermore, when used herein, the terms “comprising” or “including” and / or “including…” or “containing…” specify the presence of the stated shape, number, step, operation, component, element and / or group thereof, and are not intended to exclude the presence or addition of one or more other shapes, numbers, operations, components, elements and / or groups thereof.

[0036] Additionally, to aid in understanding this disclosure, the drawings are not drawn to scale, and the dimensions of some components may be exaggerated. Furthermore, the same reference numerals may be assigned to the same components in different embodiments.

[0037] The statement that two objects used for comparison are “equal” means “substantially identical.” Therefore, substantially identical can include deviations considered low in the art, such as less than 5%. Furthermore, uniformity of parameters over a given region can mean uniformity from an average perspective.

[0038] Although terms such as "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another, and unless otherwise specifically stated, it should be understood that a first component can also be a second component.

[0039] Throughout this specification, unless otherwise specified, each element may be singular or plural.

[0040] When any configuration is placed "on (or below)" or "above (or below)" a component, this can mean not only that the configuration is positioned to contact the top (or bottom) of the component, but also that other configurations can be inserted between the component and the configuration placed on (or below) the component.

[0041] Additionally, when a component is described as being “connected to,” “joined to,” or “linked to” another component, these components may be directly connected, joined, or linked to each other. However, it should be understood that other components may be “inserted” between these components, or these components may be “connected,” “joined,” or “linked” through yet another component.

[0042] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Furthermore, when describing embodiments of this disclosure, the use of “may” refers to “one or more embodiments of this disclosure.” Expressions such as “one or more” and “at least one” preceding the list of components modify the entire list of components, but not individual components within the list.

[0043] Throughout this specification, “A and / or B” means A, B, or A and B, unless otherwise stated to the contrary. That is, “and / or” includes any or all combinations of the listed items. When “C to D” is stated, it means greater than or equal to C and less than or equal to D, unless otherwise specifically stated.

[0044] When a list of elements A, B, and C is specified using phrases such as “at least one of A, B, and C”, “at least one of A, B, or C”, “at least one of the group selected from A, B, and C”, or “at least one of A, B, and C”, these phrases may refer to any and all suitable combinations.

[0045] The term “use” may be considered synonymous with the term “utilize”. As used in this specification, the terms “substantially,” “about,” and other similar terms are used as approximations rather than terms of degree and are intended to take into account the inherent variations in measured or calculated values ​​as recognized by those skilled in the art.

[0046] It should be understood that although the terms first, second, third, etc., may be used herein to describe various elements, components, regions, layers, and / or portions, these elements, components, regions, layers, and / or portions should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or portion from another element, component, region, layer, or portion. Therefore, the first element, component, region, layer, or portion discussed below may be referred to as the second element, component, region, layer, or portion without departing from the teachings of the exemplary embodiments.

[0047] For ease of description, spatial relational terms such as "below," "below," "lower part," "above," and "upper part" are used herein to describe the relationship between one element or feature and another element or feature as shown in the figures. It should be understood that, in addition to the orientation depicted in the figures, spatial relational terms are also intended to cover different orientations of the device in use or operation. For example, when an element or feature in the figure is flipped, an element described as "below" or "below" becomes "upper" or "above." Therefore, the term "below" can encompass both upward and downward directions.

[0048] The terminology used in this specification is intended to describe embodiments of this disclosure and is not intended to limit this disclosure.

[0049] Figure 1 This is a perspective view schematically illustrating the configuration of a battery pack according to one or more embodiments of the present disclosure. Reference Figure 1 The battery pack may include a housing 10, a battery 2, and a busbar 3.

[0050] The housing 10 can form the general shape of the battery pack and provide space therein to accommodate multiple batteries 2. The housing 10 may include a housing body 11 and a cover 12.

[0051] The housing body 11 can be formed into the shape of a box with an empty interior and an open surface. The cross-sectional shape of the housing body 11 can be designed into various shapes such as polygonal, circular, and elliptical shapes.

[0052] The cover 12 can be attached to the housing body 11 and can close the internal space of the housing body 11. In one example, the cover 12 can be formed with a generally plate shape and can be configured as an open surface facing the housing body 11. The cover 12 can be secured to the housing body 11 by various types of joining methods such as bolting, welding, and fitting.

[0053] Battery 2 can be used as a unit structure for storing and supplying power in a battery pack. Figure 2 This is a perspective view schematically illustrating the configuration of a battery according to one or more embodiments of the present disclosure. Figure 3 It is shown schematically. Figure 2 An exploded perspective view of the battery configuration. Figure 4 It is shown schematically. Figure 2 A cross-sectional view of the battery configuration, and Figure 5 yes Figure 4 An enlarged view of the V portion in the cross-sectional diagram.

[0054] In the following text, an example in which battery 2 is a prismatic lithium-ion rechargeable battery will be described. However, a rechargeable battery can be a lithium polymer battery or a cylindrical battery.

[0055] refer to Figures 2 to 5 The battery 2 may include a housing 100, an electrode assembly 200, a first terminal piece 301 and a second terminal piece 302, a cover assembly 400, a first current collector assembly 500, and a second current collector assembly 600.

[0056] The housing 100 can form the general shape of the battery 2 and house the electrode assembly 200 therein. The housing 100 may include a bottom portion 110, a front surface portion 120, a rear surface portion 130, a first side surface portion 140, and a second side surface portion 150.

[0057] The bottom portion 110 can form the bottom side appearance of the outer casing 100 (based on...) Figure 3 The bottom portion 110 may have a rectangular plate shape. The bottom portion 110 may be mounted on the bottom surface of the housing body 11.

[0058] The front surface portion 120, rear surface portion 130, first side surface portion 140, and second side surface portion 150 can form the outer periphery of the housing 100. The front surface portion 120, rear surface portion 130, first side surface portion 140, and second side surface portion 150 can have a plate shape extending upwards from the edge of the bottom portion 110 (based on...). Figure 3 The front surface portion 120, the rear surface portion 130, the first side surface portion 140, and the second side surface portion 150 can be configured to surround the space above the bottom portion 110. The front surface portion 120, the rear surface portion 130, the first side surface portion 140, and the second side surface portion 150 can be configured to form a rectangular cross-sectional shape.

[0059] The front surface portion 120 and the rear surface portion 130 may be configured to extend in the longitudinal direction of the housing 100 (e.g., parallel to the Y-axis) and face each other. The front surface portion 120 and the rear surface portion 130 may be arranged parallel to each other. The areas of the front surface portion 120 and the rear surface portion 130 may be the same.

[0060] The first side surface portion 140 and the second side surface portion 150 may be configured to extend in the width direction of the housing 10 (e.g., parallel to the X-axis) and face each other. The first side surface portion 140 and the second side surface portion 150 may be arranged parallel to each other. The areas of the first side surface portion 140 and the second side surface portion 150 may be the same. Each of the areas of the first side surface portion 140 and the second side surface portion 150 may be smaller than the area of ​​the front surface portion 120 or the area of ​​the rear surface portion 130.

[0061] The housing 100 may further include an opening 160. The opening 160 may refer to the space surrounded by the upper ends of the front surface portion 120, the rear surface portion 130, the first side surface portion 140, and the second side surface portion 150. The opening 160 can interconnect the internal and external spaces of the housing 100. Therefore, the housing 100 may have a rectangular shape with an open top.

[0062] The first direction described below can refer to... Figure 3 or Figure 4 The direction is parallel to the Z-axis and extends from the bottom portion 110 toward the opening 160. The second direction can refer to... Figure 3 or Figure 4 The direction is parallel to the Y-axis and extends from the first side surface portion 140 toward the second side surface portion 150 (i.e., the -Y-axis direction). The third direction may refer to the direction based on... Figure 3 or Figure 4 The direction is parallel to the X-axis and extends from the front surface portion 120 toward the rear surface portion 130 (i.e., the -X-axis direction).

[0063] The electrode assembly 200 can be used as a unit structure for performing charging and discharging operations of the electricity in the battery 2. The electrode assembly 200 can be housed in the housing 100.

[0064] Figure 6 This is a schematic illustration of what may be included in Figure 2 A diagram showing the configuration of the electrode assembly in battery 2. (See reference) Figure 6 The electrode assembly 200 may include a first electrode 210, a second electrode 220, and a diaphragm 230 disposed between the first electrode 210 and the second electrode 220. Multiple first electrodes 210, diaphragms 230, and second electrodes 220 may be provided.

[0065] In the following description, the electrode assembly 200 will be described as having a stacked form, wherein a plurality of first electrodes 210, a plurality of diaphragms 230, and a plurality of second electrodes 220 are stacked sequentially in a third direction. However, the stacked body of the first electrodes 210, diaphragms 230, second electrodes 220, and diaphragms 230, each having a sheet shape having a length relatively longer than its width, can be formed in a form where it is wound around a winding axis in a clockwise or counterclockwise direction, or it can be formed in a form where it is stacked by winding in units of predetermined length.

[0066] The first electrode 210 can be used as either the positive or negative electrode of the electrode assembly 200. An example of the first electrode 210 as the positive electrode of the electrode assembly 200 will be described below. However, the first electrode 210 can also be used as the negative electrode of the electrode assembly 200.

[0067] The first electrode 210 may be formed in the form of a foil including a metallic material such as aluminum or an aluminum alloy. The type, size, shape, etc. of the first electrode 210 may vary as long as the first electrode 114 has conductivity without causing chemical changes in the battery. In addition to Figure 6 the rectangular shape shown in

[0068] the cross-sectional shape of the first electrode 210 may also be designed in various shapes.

[0069] A first active material layer 211 may be formed on at least a part of the first electrode 210. The first active material layer 211 may be formed on both surfaces of the first electrode 210, or alternatively, may be formed only on one surface of the first electrode 210. Since the first electrode 210 serves as a positive electrode, the first active material layer 211 may include a positive electrode active material.

[0070] The positive electrode active material may be a compound (lithiated insertion compound) capable of reversibly inserting and extracting lithium. More specifically, one or more of composite oxides of lithium and metals selected from cobalt, manganese, nickel, and combinations thereof may be used.

[0071] In one example, the positive electrode active material may include at least one of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNi

[0072] , , z , x , y , y , z , z , x , , x ,

[0071] , y Co y Mn z O2, NCM). Here, 0 < x < 1, 0 < y < 1, 0 < z < 1, and x + y + z = 1 can be satisfied. The positive electrode active material may include only one of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNi x Co y Mn z O2, NCM), and may include any two or all of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNi x Co y Mn z O2, NCM).

[0072] The first active material layer 211 may further include a positive electrode conductive material.

[0073] The positive electrode conductive material is used to impart conductivity to the first active material layer 211, and any material that does not cause a chemical change and is electronically conductive can be used. Examples of positive electrode conductive materials may include: carbon materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes; metallic materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers such as polyphenylene derivatives; or mixtures thereof.

[0074] The first active material layer 211 may further include a positive electrode binder.

[0075] The positive electrode binder is used to ensure good adhesion between the particles constituting the positive electrode active material, and also to ensure good adhesion of the positive electrode active material to the first electrode 210. Examples of positive electrode binders may include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0076] 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.

[0077] 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.

[0078] When using an aqueous binder as the positive electrode binder, a cellulose compound can be further incorporated to impart viscosity. This cellulose compound can be used by mixing one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, or their alkali metal salts. Na, K, or Li can be used as the alkali metal.

[0079] Dry adhesives can be polymeric materials that can be fibrous, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0080] The first electrode 210 may include a first uncoated portion 212 thereon on which the first active material layer 211 is not formed. The first uncoated portion 212 may be disposed in the upper region of the first electrode 210 that is positioned to face the opening 160 in the housing 100. However, the first uncoated portion 212 may be formed on the entire edge region of the first electrode 210.

[0081] The second electrode 220 can be used as another of the positive and negative electrodes of the electrode assembly 200. An example of the second electrode 220 as the negative electrode of the electrode assembly 200 will be described below. However, the second electrode 220 can also be used as the positive electrode of the electrode assembly 200.

[0082] Multiple second electrodes 220 may be provided. These second electrodes 220 may be arranged in a third-party orientation between the front surface portion 120 and the rear surface portion 130 of the housing 100. The first electrode 210 and the second electrode 220 may be alternately arranged in a third-party orientation. The second electrodes 220 may be spaced apart from the first electrode 210 in a third-party orientation at a predetermined interval.

[0083] The second electrode 220 can be formed in the shape of a foil containing a metallic material such as copper, copper alloy, nickel, or nickel alloy. The type, size, and shape of the second electrode 220 can vary, as long as it is conductive and does not cause chemical changes in the battery. (Except for...) Figure 6 In addition to the rectangular shape shown, the cross-sectional shape of the second electrode 220 can also be designed in various shapes.

[0084] The second active material layer 221 may be formed on at least a portion of the second electrode 220. The second active material layer 221 may be formed on both surfaces of the second electrode 220, or alternatively, it may be formed on only one surface of the second electrode 220.

[0085] Since the second electrode 220 is used as a negative electrode, the second active material layer 221 may include a negative electrode active material.

[0086] Negative electrode active materials include materials capable of reversibly inserting / deintercalating lithium ions, lithium metal, lithium and metal alloys, materials capable of doping and dedoping lithium, or transition metal oxides.

[0087] Materials capable of reversibly inserting / deintercalating lithium ions can be carbon-based negative electrode active materials, such as crystalline carbon, amorphous carbon, or combinations thereof. Examples of crystalline carbon may include graphite such as amorphous, plate-like, sheet-like, spherical, or fibrous natural or artificial graphite, and examples of amorphous carbon may include soft or hard carbon, mesophase pitch carbides, calcined coke, etc.

[0088] 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 can be used as an alloy of lithium and the metal.

[0089] As a material capable of doping and de-doping lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material can be used. The Si-based negative electrode active material can include 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 can include Sn, SnO2, a Sn-based alloy, or a combination thereof.

[0090] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to one or more embodiments, the silicon-carbon composite can be in the form of silicon particles coated with amorphous carbon on their surfaces. For example, the silicon-carbon composite can include secondary particles (cores) in which primary silicon particles are aggregated and an amorphous carbon coating (shell) located on the surface of the secondary particles. Amorphous carbon can also be located between the primary silicon particles such that, for example, the primary silicon particles can be coated with amorphous carbon. The secondary particles can be dispersed in an amorphous carbon matrix.

[0091] The silicon-carbon composite can further include crystalline carbon. For example, the silicon-carbon composite can include a core containing crystalline carbon and silicon particles and an amorphous carbon coating located on the surface of the core.

[0092] The Si-based negative electrode active material or the Sn-based negative electrode active material can be used in combination with a carbon-based negative electrode active material.

[0093] The second active material layer 221 can further include a negative electrode conductive material and a negative electrode binder.

[0094] The negative electrode conductive material is used to impart conductivity to the second active material layer 221, and any material that does not cause a chemical change and is electronically conductive can be used. Examples of the negative electrode conductive material can include: carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, and carbon nanotube; metal-based materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers such as polyphenylene derivatives; or mixtures thereof.

[0095] The negative electrode binder is used to adhere well the particles constituting the negative electrode active material to each other and also to adhere well the negative electrode active material to the second electrode 220.

[0096] Examples of negative electrode adhesives may include non-aqueous adhesives, aqueous adhesives, dry adhesives, or combinations thereof.

[0097] 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.

[0098] 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.

[0099] When using an aqueous binder as the negative electrode binder, a cellulose compound can be further incorporated to impart viscosity. This cellulose compound can be used by mixing one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, or their alkali metal salts. Na, K, or Li can be used as the alkali metal.

[0100] Dry adhesives can be polymeric materials that can be fibrous, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0101] The second electrode 220 may include a second uncoated portion 222 on which the second active material layer 221 is not formed. The second uncoated portion 222 may be disposed in the upper region of the second electrode 220 that is positioned facing the opening 160 in the housing 100. However, the form of the second uncoated portion 222 may vary, and the second uncoated portion 222 may be formed on the entire edge region of the second electrode 220.

[0102] A diaphragm 230 may be disposed between the first electrode 210 and the second electrode 220. The diaphragm 230 may perform the function of preventing 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.

[0103] The diaphragm 230 can be configured to completely cover the surface area of ​​the electrode assembly 200. Therefore, the diaphragm 230 can prevent the first electrode 210 and the second electrode 220 from being directly exposed to the outside of the electrode assembly 200.

[0104] As the separator 230, a multilayer membrane of polyethylene, polypropylene, polyvinylidene fluoride or two or more layers thereof can be used, and a mixed multilayer membrane such as a polyethylene / polypropylene two-layer separator, a polyethylene / polypropylene / polyethylene three-layer separator, a polypropylene / polyethylene / polypropylene three-layer separator, etc. can be used.

[0105] The diaphragm 230 may include a porous substrate and a coating comprising organic material, inorganic material or a combination thereof on one or both surfaces of the porous substrate.

[0106] The porous substrate can be a polymer film formed from any of the following polymers: 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, polytetrafluoroethylene (such as Teflon), or copolymers or mixtures of two or more thereof.

[0107] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylamide polymers.

[0108] 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.

[0109] Organic and inorganic materials can exist as a mixture in a single coating, or they can exist in the form of a coating that includes organic materials and a coating that includes inorganic materials stacked together.

[0110] The first terminal piece 301 can be connected to the first electrode 210 and can protrude outward from the electrode assembly 200. When the first electrode 210 is used as a positive electrode, the first terminal piece 301 can be used as a positive electrode terminal piece of the battery 2. However, when the first electrode 210 is a negative electrode, the first terminal piece 301 can be used as a negative electrode terminal piece of the battery 2.

[0111] The first contact member 301 may extend from the electrode assembly 200 in a first direction. That is, the first contact member 301 may extend from the interior of the housing 100 toward the opening 160.

[0112] The first connector member 301 may include one or more connector members. For example, the first connector member 301 may include a first inner connector member 310 and a first outer connector member 320. However, the first connector member 301 may include one connector member or three or more connector members.

[0113] The first inner connector member 310 and the first outer connector member 320 may be spaced apart from each other in the second direction. For example, the first outer connector member 320 and the first inner connector member 310 may be arranged sequentially in the second direction. That is, the first outer connector member 320 may be arranged at a position spaced a predetermined distance from the first inner connector member 310 in a direction opposite to the second direction. The first outer connector member 320 may be arranged at a position relatively closer to the first side surface portion 140 than the first inner connector member 310.

[0114] The first inner contact component 310 may include a first inner contact 311. The first inner contact 311 may have the shape of a foil extending from the first uncoated portion 212 of the first electrode 210 in a first direction. The first inner contact 311 may have a substantially rectangular shape. However, the shape of the first inner contact 311 may be designed in various forms.

[0115] The first inner connecting piece 311 may be integrally formed with the first electrode 210. For example, the first inner connecting piece 311 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 means of a slit or similar process. In one or more other embodiments, the first inner connecting piece 311 may be manufactured separately from the first electrode 210 and then connected to the first uncoated portion 212 by means of welding or the like. The material of the first inner connecting piece 311 may be the same as the material of the first electrode 210.

[0116] Multiple first inner terminals 311 may be provided. The number of first inner terminals 311 may be the same as the number of first electrodes 210. Each of the first inner terminals 311 may extend individually from a first uncoated portion 212 of a different first electrode 210. Adjacent first inner terminals 311 may be arranged facing each other in a third-order direction. Adjacent first inner terminals 311 may be arranged parallel to each other. The first inner terminal assembly 310 may be an assembly of multiple first inner terminals 311 stacked in a third-order direction. Adjacent first inner terminals 311 may contact each other and may also be spaced apart from each other by the thickness of the diaphragm 230.

[0117] The first external lead member 320 may include a first external lead 321. The first external lead 321 may have the shape of a foil extending from the first uncoated portion 212 of the first electrode 210 in a first direction. The first external lead 321 may be positioned at a predetermined distance from the first internal lead 311 in a direction opposite to the second direction. The first external lead 321 may have a substantially rectangular shape. However, the shape of the first external lead 321 may be designed in various forms.

[0118] The first external contact 321 may be integrally formed with the first electrode 210. For example, the first external contact 321 may be the area other than the first internal contact 311 in the remaining area of ​​the first uncoated portion 212 after a portion of the first uncoated portion 212 has been cut or removed by means of a slit or similar process. In one or more other embodiments, the first external contact 321 may be manufactured separately from the first electrode 210 and then connected to the first uncoated portion 212 by means of welding or the like. The material of the first external contact 321 may be the same as the material of the first electrode 210.

[0119] Multiple first external leads 321 may be provided. The number of first external leads 321 may be the same as the number of first electrodes 210. Each of the first external leads 321 may extend individually from a first uncoated portion 212 of a different first electrode 210. Adjacent first external leads 321 may be arranged facing each other in a third-order direction. Adjacent first external leads 321 may be arranged parallel to each other. The first external lead assembly 320 may be an assembly of multiple first external leads 321 stacked in a third-order direction. Adjacent first external leads 321 may contact each other and may also be spaced apart by the thickness of the diaphragm 230.

[0120] Battery 2 may further include a second terminal member 302. The second terminal member 302 may be connected to the second electrode 220 and may protrude outward from the electrode assembly 200. When the second electrode 220 is used as a negative electrode, the second terminal member 302 may serve as a negative electrode terminal of battery 2. However, when the second electrode 220 is a positive electrode, the second terminal member 302 may serve as a positive electrode terminal of battery 2.

[0121] The second connector member 302 may extend from the electrode assembly 200 in a first direction. That is, the second connector member 302 may extend from the interior of the housing 100 toward the opening 160.

[0122] The second connector member 302 may include one or more connector members. For example, the second connector member 302 may include a second inner connector member 330 and a second outer connector member 340. However, the second connector member 302 may include one connector member or three or more connector members.

[0123] The second inner connector member 330 and the second outer connector member 340 may be spaced apart from each other in the second direction. For example, the second inner connector member 330 and the second outer connector member 340 may be arranged sequentially in the second direction. That is, the second outer connector member 340 may be disposed at a position spaced a predetermined distance from the second inner connector member 330 in the second direction. The second outer connector member 340 may be disposed at a position relatively closer to the second side surface portion 150 than the second inner connector member 330.

[0124] The second inner contact component 330 may include a second inner contact 331. The second inner contact 331 may have the shape of a foil extending from the second uncoated portion 222 of the second electrode 220 in a first direction. The second inner contact 331 may have a substantially rectangular shape. However, the shape of the second inner contact 331 may be designed in various forms.

[0125] The second inner terminal 331 may be integrally formed with the second electrode 220. For example, the second inner terminal 331 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 means of a slit or similar process. In one or more other embodiments, the second inner terminal 331 may be manufactured separately from the second electrode 220 and then connected to the second uncoated portion 222 by means of welding or the like. The material of the second inner terminal 331 may be the same as the material of the second electrode 220.

[0126] Multiple second inner terminals 331 may be provided. The number of second inner terminals 331 may be the same as the number of second electrodes 220. Each of the second inner terminals 331 may extend individually from a second uncoated portion 222 of a different second electrode 220. Adjacent second inner terminals 331 may be arranged facing each other in a third-order direction. Adjacent second inner terminals 331 may be arranged parallel to each other. The second inner terminal assembly 330 may be an assembly of multiple second inner terminals 331 stacked in a third-order direction. Adjacent second inner terminals 331 may contact each other and may also be spaced apart from each other by the thickness of the diaphragm 230.

[0127] The second external lead member 340 may include a second external lead 341. The second external lead 341 may have the shape of a foil extending from the second uncoated portion 222 of the second electrode 220 in a first direction. The second external lead 341 may be positioned at a predetermined distance from the second internal lead 331 in a second direction. The second external lead 341 may have a substantially rectangular shape. However, the shape of the second external lead 341 may be designed in various forms.

[0128] The second external connector 341 can be integrally formed with the second electrode 220. For example, the second external connector 341 can be the area other than the second internal connector 331 in 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 slit or similar process. Alternatively, the second external connector 341 can 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 external connector 341 can be the same as the material of the second electrode 220.

[0129] Multiple second external leads 341 may be provided. The number of second external leads 341 may be the same as the number of second electrodes 220. Each of the second external leads 341 may extend individually from a second uncoated portion 222 of a different second electrode 220. Adjacent second external leads 341 may be arranged facing each other in a third-order direction. Adjacent second external leads 341 may be arranged parallel to each other. The second external lead assembly 340 may be an assembly of multiple second external leads 341 stacked in a third-order direction. Adjacent second external leads 341 may contact each other and may also be spaced apart from each other by the thickness of the diaphragm 230.

[0130] Further reference Figures 2 to 5 The cover assembly 400 can be coupled to the housing 100 and seal the housing 100. The cover assembly 400 can be configured to face the electrode assembly 200 in a first direction. The cover assembly 400 may include a cover plate 410, a first terminal 420, and a second terminal 430.

[0131] The cover plate 410 can form the general appearance of the cover assembly 400 and can fully support the first terminal 420 and the second terminal 430. The cover plate 410 can be formed to have a flat plate shape. The cover plate 410 can be disposed in the opening 160 of the housing 100. The cover plate 410 can be positioned facing the electrode assembly 200 in a first direction. That is, the cover plate 410 can be disposed at a position spaced a predetermined distance from the electrode assembly 200 in the first direction. The cover plate 410 can be disposed parallel to the bottom portion 110 of the housing 100.

[0132] The cover plate 410 can be disposed on the upper end of the housing 100, more specifically, on the upper end of the front surface portion 120, the rear surface portion 130, the first side surface portion 140, and the second side surface portion 150. The cover plate 410 can be attached to the housing 100 by various types of joining methods such as welding, bolting, and mating.

[0133] The first terminal 420 can be inserted into the interior of the cover plate 410. The first terminal 420 can be electrically connected to the first electrode 210. When the first electrode 210 is used as a positive electrode, the first terminal 420 can be used as the positive electrode terminal of the battery 2. In addition, the upper end of the first terminal 420 can protrude outward from the cover plate 410 in a first direction.

[0134] Figure 3 An example is shown in which the first terminal 420 has a rectangular planar shape, but the shape of the first terminal 420 can be designed to be various shapes such as circular, elliptical, polygonal, etc. The first terminal 420 can be formed of an electrically conductive material such as aluminum, nickel, copper, etc.

[0135] According to one aspect of this embodiment, a coupling protrusion (a second coupling protrusion, not shown) projecting inward from the cover plate 410 in a first direction may be provided at the lower end of the first terminal 420. The size or shape of the second coupling protrusion may vary, as long as the second coupling protrusion can be inserted and engaged with the portion provided below (see reference 1) Figure 7 The second engagement hole H2 in the second engagement portion 713 of the described flexible current collector 710. For example, the second engagement protrusion may have a cylindrical shape with a diameter slightly smaller than or substantially the same as the diameter of the second engagement hole H2.

[0136] The first gasket 421 can be installed between the cover plate 410 and the first terminal 420. The first gasket 421 can electrically insulate the cover plate 410 and the first terminal 420 and prevent moisture or foreign objects from entering between the cover plate 410 and the first terminal 420.

[0137] The first gasket 421 can be formed from an insulating material such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET) rubber. The first gasket 421 can be fixed between the cover plate 410 and the first terminal 420 by pressing, injection molding, adhesion, or other methods.

[0138] The second terminal 430 can be inserted into the interior of the cover plate 410. The second terminal 430 can be electrically connected to the second electrode 220. When the second electrode 220 is used as a negative electrode, the second terminal 430 can be used as the negative electrode terminal of the battery 2. In addition, the upper end of the second terminal 430 can protrude outward from the cover plate 410 in a first direction.

[0139] Figure 3 An example is shown in which the second terminal 430 has a rectangular planar shape, but the shape of the second terminal 430 can be designed to be various shapes such as circular, elliptical, polygonal, etc. The second terminal 430 can be formed of an electrically conductive material such as aluminum, nickel, copper, etc.

[0140] According to one aspect of this embodiment, a coupling protrusion (a second coupling protrusion, not shown) projecting inward from the cover plate 410 in a first direction may be provided at the lower end of the second terminal 430. The size or shape of the second coupling protrusion may vary, as long as the second coupling protrusion can be inserted and engaged with the portion provided below. Figure 7 The second engagement hole H2 in the second engagement portion 713 of the described flexible current collector 710. For example, the second engagement protrusion may have a cylindrical shape with a diameter slightly smaller than or substantially the same as the diameter of the second engagement hole H2.

[0141] The second gasket 431 can be installed between the cover plate 410 and the second terminal 430. The second gasket 431 can electrically insulate the cover plate 410 and the second terminal 430 and prevent moisture or foreign objects from entering between the cover plate 410 and the second terminal 430.

[0142] The second gasket 431 can be formed from an insulating material such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET) rubber. The second gasket 431 can be fixed between the cover plate 410 and the second terminal 430 by pressing, injection molding, adhesion, or other methods.

[0143] The cover assembly 400 may further include a vent 440 and a vent 450. The vent 440 may be formed in the shape of a hole that passes perpendicularly through both sides of the cover plate 410 in a first direction. The vent 440 may be configured to provide a path for the discharge of flames, gases, smoke, etc., generated inside the housing 100 to the outside of the housing 100 in the event of thermal runaway of the battery 2 due to overcurrent, etc. The vent 440 may be disposed between the first terminal 420 and the second terminal 430 in a second direction. The cross-sectional shape of the vent 440 may be designed in various shapes such as elliptical, circular, polygonal, etc.

[0144] The vent 450 is installed in the vent 440 and can open and close in response to changes in the internal pressure of the housing 100. That is, when the battery 2 is operating normally, the vent 450 can prevent electrolytes or other substances in the housing 100 from leaking out of the housing 100 or prevent moisture, foreign objects, etc. from entering the housing 100 by closing the vent 440. When thermal runaway of the battery 2 occurs, the vent 450 can open the vent 440 to guide flames, gases, smoke, etc. formed in the housing 100 to the outside of the housing 100.

[0145] The vent 450 can be formed into a generally plate shape. The vent 450 can be fixed to the cover plate 410 by various types of joining methods such as welding, bolting, and mating. The vent 450 can be provided in the vent hole 440, or it can be provided facing the vent hole 440 on the upper or lower side of the cover plate 410 in the first direction.

[0146] The thickness of the vent 450 parallel to the first direction can be less than the thickness of the cover plate 410. Therefore, the vent 450 can easily rupture or break when the internal pressure of the housing 100 increases. The vent 450 may include a recessed notch formed toward the interior of the vent 450 to preferentially rupture when the internal pressure of the housing 100 increases.

[0147] The cover assembly 400 may further include an electrolyte inlet 460 formed through the cover plate 410, and a sealing plug may be installed in the electrolyte inlet 460. The electrolyte inlet 460 may be positioned spaced apart from the vent hole 440 in a second direction or in a direction opposite to the second direction. The electrolyte inlet 460 may be located between the first terminal 420 and the second terminal 430.

[0148] The cover assembly 400 may further include an insulating plate 470. The insulating plate 470 may be disposed between the cover plate 410 and the electrode assembly 200. The insulating plate 470 prevents direct contact between the cover plate 410 and the electrode assembly 200, thereby insulating the cover plate 410 and the electrode assembly 200. The insulating plate 470 can fix the position of the electrode assembly 200 within the housing 100. When the cover plate 410 deforms toward the interior of the housing 100 due to external impacts, the insulating plate 470 can prevent damage to the electrode assembly 200.

[0149] The insulating plate 470 can be configured to face the electrode assembly 200 in the housing 100 in a direction opposite to the first direction. That is, the electrode assembly 200, the insulating plate 470, and the cover plate 410 can be arranged sequentially in the first direction. The insulating plate 470 can be fixed to the inner surface of the housing 100 by various types of joining methods such as mating, welding, bolting, and adhesion. The insulating plate 470 can contact one surface of the electrode assembly 200 (from which the first inner connecting member 310 and the second inner connecting member 330 extend). The insulating plate 470 can be formed of an insulating material such as polyethylene (PE), polypropylene (PP), or polyethylene terephthalate (PET) rubber.

[0150] The first current collector assembly 500 can be disposed between the electrode assembly 200 and the cover assembly 400. The first current collector assembly 500 can be connected to the first terminal 420 and the first contact member 301. The first current collector assembly 500 can be used as a configuration for electrically connecting the first terminal 420 and the first contact member 301. The first current collector assembly 500 can be formed of an electrically conductive material. The first current collector assembly 500 can be implemented differently depending on the type of battery, the shape or arrangement of the first contact member 301, the shape or arrangement of the first terminal 420, etc.

[0151] According to one or more implementation methods, such as Figure 3 As shown, the first current collector assembly 500 may include a first flexible current collector 510 and a first current collector plate 520. The first flexible current collector 510 and the first current collector plate 520 may be manufactured as separate components and joined together by welding or the like.

[0152] The first flexible current collector 510 and the first current collector plate 520 can be assembled and joined to each other by a tongue-and-groove fit. In this case, it can be joined at one end of the first flexible current collector 510 (see...). Figure 7 A recess or hole is formed in (see 712) (see Figure 7 H1), and a protrusion may be formed on the first manifold 520. Conversely, a protrusion may be formed on one end of the first flexible manifold 510, and a recess or hole may be formed in the first manifold 520.

[0153] In any case, when the first flexible current collector 510 and the first current collector plate 520 are assembled and joined, the first flexible current collector 510 and the first current collector plate 520 can be joined to each other by butt welding. This improves the welding stiffness compared to overlay welding. Consequently, the bonding strength between the first flexible current collector 510 and the first current collector plate 520 can be improved.

[0154] In the first flexible current collector 510, one end can be coupled to the first current collector plate 520, and the other end (see...) Figure 7 The first flexible current collector 510 (713) can be joined and connected to the first terminal 420. The first flexible current collector 510 is connected between one end and the other end with a flexible conductive material, thus possessing overall flexibility. Therefore, even when the positions of the first current collector 520 and the first terminal 420 are not aligned in a first direction, the first current collector 520 and the first terminal 420 can still be electrically connected to each other via the first flexible current collector 510. That is, the design freedom regarding the arrangement of each of the first current collector 520 and the first terminal 420 can be increased. The shape of each of the first flexible current collector 510 and the first current collector 520 and their bonding structure will be described in more detail below.

[0155] The other end of the first flexible current collector 510 can contact and be bonded to the lower surface of the first terminal 420. For example, when the flat surface of the other end of the first flexible current collector 510 and the lower surface of the first terminal 420 overlap, they can be bonded to each other by welding. In one or more other embodiments, when the other end of the first flexible current collector 510 is formed of a metal wire bundle, the metal wire bundle can be bonded to the lower surface of the first terminal 420 by welding while simultaneously contacting the lower surface of the first terminal 420.

[0156] As another example, the first flexible current collector 510 and the first terminal 420 can also be assembled and engaged with each other via a tongue-and-groove fit. In this case, a recess or hole H2 can be formed in the other end of the first flexible current collector 510 (see [link to documentation]). Figure 7 A protrusion may be formed on the lower surface of the first terminal 420. Conversely, a protrusion may be formed on the other end of the first flexible current collector 510, and a recess or hole may be formed in the lower surface of the first terminal 420.

[0157] In this configuration, with the first flexible current collector 510 and the first terminal 420 assembled and joined, the first flexible current collector 510 and the first terminal 420 can be joined together by butt welding. Therefore, compared to joining by overlay welding, the welding stiffness can be improved. As a result, the connection strength between the first flexible current collector 510 and the first terminal 420 can be improved.

[0158] The first current collector 520 can be connected to the first flexible current collector 510 and the first terminal block member 301. The first current collector 520 may include a first center plate 521 (first sub-plate) and a first inner plate 522 (second sub-plate) and a first outer plate 523 (second sub-plate) extending from the first center plate 521 on both sides. In one or more other embodiments, the first current collector 520 may include only the first sub-plate 521 and a second sub-plate 522 or 523 extending on one side therefrom.

[0159] The first center plate 521 can form the central appearance of the first current collector 520, and one end of the first flexible current collector 510 can be engaged and connected to the first center plate 521. The first center plate 521 can be disposed between the first flexible current collector 510 and the electrode assembly 200. However, the first center plate 521 does not necessarily have to be disposed directly below the first terminal 420 in the first direction, and can be disposed closer to the first side surface portion 140 in the second direction or further away from the first side surface portion 140 in the second direction. As described above, the first center plate 521 can fix the first flexible current collector 510 while its upper surface contacts the lower surface of one end of the first flexible current collector 510, or fix the first flexible current collector 510 in a concave-convex fit state.

[0160] The two ends of the first center plate 521 can extend from the surface that is coupled with the first flexible current collector 510 toward the electrode assembly 200. The two ends of the first center plate 521 can pass through the insulating plate 470 and can be disposed on the underside of the insulating plate 470.

[0161] The first inner plate 522 may extend from one end of the first center plate 521 in a second direction. The first inner plate 522 may be positioned to face the first inner connector member 310 in the first direction. The first inner plate 522 may contact the end surface of the first inner connector member 310. The first inner connector member 310 and the first inner plate 522 may be joined together by laser welding.

[0162] The first outer plate 523 can extend from the other end of the first center plate 521 in a direction opposite to the second direction. The first outer plate 523 can be configured to face the first external connector member 320 in a direction opposite to the first direction. The first outer plate 523 can contact the end surface of the first external connector member 320. The first external connector member 320 and the first outer plate 523 can be joined together by laser welding.

[0163] The first inner plate 522 and the first outer plate 523 may not be on the same plane as the first center plate 521, but may form parallel planes at different heights. More specifically, the first inner plate 522 and the first outer plate 523 may be bent at the boundary between each of the first inner plate 522 and the first center plate 521, so as to be closer to the first terminal piece member 301 than the first center plate 521. As a result, the first inner plate 522 and the first outer plate 523 may protrude more toward the electrode assembly 200 than the first center plate 521.

[0164] The battery 2 may further include a second current collector assembly 600. The second current collector assembly 600 may be disposed between the electrode assembly 200 and the cover assembly 400. The second current collector assembly 600 may be connected to the second terminal 430 and the second contact member 302. The second current collector assembly 600 may be configured to electrically connect the second terminal 430 and the second contact member 302. The second current collector assembly 600 may be formed of an electrically conductive material. The second current collector assembly 600 may be implemented differently depending on the type of battery, the shape or arrangement of the second contact member 302, the shape or arrangement of the second terminal 430, etc.

[0165] According to one or more implementation methods, such as Figure 3 As shown, the second current collector assembly 600 may include a second flexible current collector 610 and a second current collector plate 620. The second flexible current collector 610 and the second current collector plate 620 may be manufactured as separate components and joined together by welding or the like.

[0166] The second flexible current collector 610 and the second current collector plate 620 can be assembled and joined to each other via a tongue-and-groove fit. In this case, the second flexible current collector 610 can be joined at one end (see...). Figure 7 A recess or hole is formed in “712” (see Figure 7 H2), and a protrusion may be formed on the second manifold 620. Conversely, a protrusion may be formed on one end of the second flexible manifold 610, and a recess or hole may be formed in the second manifold 620.

[0167] In any case, with the second flexible current collector 610 and the second current collector plate 620 assembled and joined, the second flexible current collector 610 and the second current collector plate 620 can be joined to each other by butt welding. Therefore, compared with joining by overlay welding, the welding stiffness can be improved. As a result, the connection strength between the second flexible current collector 610 and the second current collector plate 620 can be improved.

[0168] In the second flexible current collector 610, one end can be attached to the second current collector plate 620, while the other end (see...) Figure 7The "713" can be engaged and connected to the second terminal 430. The second flexible current collector 610 is connected between one end and the other end with a flexible conductive material, thus possessing overall flexibility. Therefore, even when the positions of the second current collector 620 and the second terminal 430 are not aligned in the first direction, the second current collector 620 and the second terminal 430 can still be electrically connected to each other through the second flexible current collector 610. That is, the design freedom regarding the arrangement of each of the second current collector 620 and the second terminal 430 can be increased. The shape of each of the second flexible current collector 610 and the second current collector 620 and their connection structure will be described in more detail below.

[0169] The other end of the second flexible current collector 610 can contact and be bonded to the lower surface of the second terminal 430. For example, when the flat surface of the other end of the second flexible current collector 610 and the lower surface of the second terminal 430 overlap, they can be bonded to each other by welding. Alternatively, when the other end of the second flexible current collector 610 is formed of a metal wire bundle, the metal wire bundle can be bonded to the lower surface of the second terminal 430 by welding while in contact with it.

[0170] As another example, the second flexible current collector 610 and the second terminal 430 can also be assembled and engaged with each other via a tongue-and-groove fit. In this case, a recess or hole H2 can be formed in the other end of the second flexible current collector 610 (see [link to documentation]). Figure 7 A protrusion may be formed on the lower surface of the second terminal 430. Conversely, a protrusion may be formed on the other end of the second flexible current collector 610, and a recess or hole may be formed in the lower surface of the second terminal 430.

[0171] In this configuration, with the second flexible current collector 610 and the second terminal 430 assembled and joined, the second flexible current collector 610 and the second terminal 430 can be joined to each other by butt welding. This increases the weld stiffness compared to joining by overlay welding. Consequently, the connection strength between the second flexible current collector 610 and the second terminal 430 can be improved.

[0172] The second manifold 620 can be connected to the second flexible current collector 610 and the second terminal block member 302. The second manifold 620 may include a second center plate 621 (first sub-plate) and a second inner plate 622 (second sub-plate) and a second outer plate 623 (second sub-plate) extending from the second center plate on both sides. In one or more other embodiments, the second manifold 620 may include only the first sub-plate 621 and a second sub-plate 622 or 623 extending on one side thereon.

[0173] The second center plate 621 can form the central appearance of the second current collector 620, and one end of the second flexible current collector 610 can be engaged and connected to the second center plate 621. The second center plate 621 can be disposed between the second flexible current collector 610 and the electrode assembly 200. However, the second center plate 621 does not necessarily have to be disposed directly below the second terminal 430 in the first direction, and can be disposed closer to the second side surface portion 150 in the second direction, or can be disposed further away from the second side surface portion 150 in the second direction. As described above, the second center plate 621 can fix the second flexible current collector 610 while its upper surface contacts the lower surface of said one end of the second flexible current collector 610, or fix the second flexible current collector 610 in a concave-convex fit state.

[0174] The two ends of the second center plate 621 can extend toward the electrode assembly 200 from the surface that is coupled with the second flexible current collector 610. The two ends of the second center plate 621 can pass through the insulating plate 470 and can be disposed on the underside of the insulating plate 470.

[0175] The second inner plate 622 can extend from one end of the second center plate 621 in a direction opposite to the second direction. The second inner plate 622 can be configured to face the second inner connector member 330 in a direction opposite to the first direction. The second inner plate 622 can contact the end surface of the second inner connector member 330. The second inner connector member 330 and the second inner plate 622 can be joined together by laser welding.

[0176] The second outer plate 623 may extend from the other end of the second center plate 621 in a second direction. The second outer plate 623 may be configured to face the second outer terminal piece 340 in a direction opposite to the first direction. The second outer plate 623 may contact the end surface of the second outer terminal piece 340. The second outer terminal piece 340 and the second outer plate 623 may be joined together by laser welding.

[0177] The second inner plate 622 and the second outer plate 623 may not be on the same plane as the second center plate 621, but may form parallel planes at different heights. More specifically, the second inner plate 622 and the second outer plate 623 may be bent at the boundary between each of the second inner plate 622 and the second center plate 621, so as to be closer to the second terminal piece member 302 than the second center plate 621. As a result, the second inner plate 622 and the second outer plate 623 may protrude more toward the electrode assembly 200 than the second center plate 621.

[0178] Figure 7 This is a plan view schematically illustrating the configuration of a flexible current collector according to one or more embodiments. Reference Figure 7The flexible current collector 710 may include a main body portion 711, a first connecting portion 712, and a second connecting portion 713. The flexible current collector 710 may correspond to... Figure 3 or Figure 4 The first flexible current collector 510 or the second flexible current collector 610 shown.

[0179] The main body 711 can be formed of a flexible conductive material. The conductive material is not necessarily limited to metal and can vary as long as it is a material with excellent conductivity. For example, the main body 711 may include a metal wire or a bundle of metal wires. In the former case, the metal wire may consist of a single metal wire with a relatively large diameter or a metal strip with a predetermined width. In the latter case, it may be a collection of multiple metal wires with relatively small diameters. In one or more other embodiments, the bundle of metal wires may be braided together, and the type of braiding may vary.

[0180] The length of the main body portion 711 can vary. However, the length of the main body portion 711 should be sufficient to connect the first current collector 520 (more specifically, the first center plate 521) and the first terminal 420. Additionally, the length of the main body portion 711 should be sufficient to connect the second current collector 620 (more specifically, the second center plate 621) and the second terminal 430. According to this embodiment, since the first center plate 521 or the second center plate 621 may not be aligned with the first terminal 420 or the second terminal 430 in the first direction, the length of the main body portion 711 can be greater than the distance in the first direction between the first center plate 521 or the second center plate 621 and the first terminal 420 or the second terminal 430.

[0181] The first connecting portion 712 is a portion extending from one end of the main body portion 711 and is a portion that engages with the first current collector 520 or the second current collector 620. The first connecting portion 712 may also be formed of a conductive material, and may be formed of the same material as the main body portion 711 or a different material. The first connecting portion 712 may have a box shape with an open side, allowing one end of the main body portion 711 (e.g., one end of a metal wire harness) to be inserted and secured.

[0182] The first engaging portion 712 can be formed as a flat plate member having a flat upper or lower surface for engaging with the first manifold 520 or the second manifold 620. Alternatively, to achieve a concave-convex engagement with the first manifold 520 or the second manifold 620 in the first engaging portion 712, an engaging hole H1 or a groove can be formed. Alternatively, as described above, the first engaging portion 712 can have engaging protrusions formed thereon.

[0183] The second connecting portion 713 is a portion extending from the other end of the main body portion 711, that is, a portion extending in the opposite direction to the first connecting portion 712, and is the portion that engages with the first terminal 420 or the second terminal 430. The second connecting portion 713 may also be formed of a conductive material, and may be formed of the same material as the main body portion 711 or a different material. The second connecting portion 713 may have a box shape with an open side, so that the other end of the main body portion 711 (e.g., the other end of a metal wire bundle) can be inserted and secured.

[0184] The second engagement portion 713 can be formed as a flat plate member having a flat upper or lower surface for engaging with the first terminal 420 or the second terminal 430. Additionally, to facilitate a protrusion-contact engagement with the first terminal 420 or the second terminal 430 in the second engagement portion 713, an engagement hole H2 or a groove can be formed. In one or more other embodiments, as described above, the second engagement portion 713 can have engagement protrusions formed thereon.

[0185] The virtual straight line connecting the first connecting portion 712 and the second connecting portion 713 is not parallel to the extension direction of the terminal block member 301 and the terminal block member 302.

[0186] Continue to refer to Figure 1 Battery 2 may include multiple batteries. The multiple batteries 2 may be arranged in the longitudinal direction of housing 10 (based on...). Figure 1 (in the X-axis direction) and width direction (based on) Figure 1 Arranged in two or more rows in at least one direction (Y-axis direction). Figure 1 The diagram shows six batteries 2 arranged in a row along the longitudinal direction of the housing 10, but the batteries 2 can be designed in various arrangements. The batteries 2 can be arranged in parallel. The number of batteries 2 can be designed in various ways depending on the size, shape, etc., of the housing 10.

[0187] The first terminal 420 of one of a pair of adjacent batteries 2 and the second terminal 430 of the other of the pair of adjacent batteries 2 can be arranged to face each other in the longitudinal direction of the housing 10. That is, the front surface portion 120 of one of the pair of adjacent batteries 2 can be configured to face the rear surface portion 130 of the other of the pair of adjacent batteries 2.

[0188] Multiple batteries 2 can be electrically connected via busbars 3. Busbars 3 can be positioned between the cover 12 and the batteries 2. Multiple busbars 3 can be provided. Each busbar 3 can connect a pair of adjacent batteries 2 in series or in parallel.

[0189] For example, the two sides of the busbar 3 can be connected to the first terminal 420 of one battery 2 and the second terminal 430 of the other battery 2 in the pair of adjacent batteries 2, respectively. Therefore, multiple batteries 2 can be connected in series with each other through the busbar 3. However, the busbar 3 can also be connected to the first terminal 420 of one battery 2 and the first terminal 420 of the other battery 2 in the pair of adjacent batteries 2, or to the second terminal 430 of one battery 2 and the second terminal 430 of the other battery 2 in the pair of adjacent batteries 2, respectively.

[0190] Busbar 3 can be formed from electrically conductive materials such as copper, aluminum, or nickel. The specific shape of busbar 3 can be... Figure 1 The shapes shown are different and can be designed in various shapes to electrically connect adjacent batteries 2.

[0191] Multiple busbars 3 can be supported in the housing 10 by busbar retainers H. The busbar retainer H can be formed to have a generally flat shape. The busbar retainer H can be disposed between the cover 12 and the battery 2. The busbars 3 can be secured to the busbar retainer H by various types of joining methods such as mating, bolting, injection joining, etc. The busbar retainer H can be configured to include an electrically insulating polymer composite material.

[0192] A connection assembly comprising one or more connecting members is disposed between multiple electrode tabs and electrode terminals for electrical connection between the multiple electrode tabs and electrode terminals. A portion of the connection assembly is engaged with the multiple electrode tabs, and another portion is engaged with the electrode terminals, thereby electrically connecting the multiple electrode tabs and electrode terminals. In the connection assembly, the connecting member engaged with the multiple electrode tabs and the connecting member engaged with the electrode terminals can be different parts of a single structure, or they can be different structures combined with each other.

[0193] The connecting assembly, also known as a current collector assembly, collects the current supplied from multiple electrode tabs and transmits the current to the electrode terminals. The shape or configuration of the current collector assembly can vary depending on the type, internal structure, specifications, and other factors of the rechargeable battery.

[0194] According to this disclosure, since the electrode terminals and the current collector are electrically connected via a flexible current collector, the positions of the electrode terminals and the current collector are independent of each other. Therefore, the design freedom of batteries including electrode terminals and a current collector electrically connected by a flexible current collector can be increased.

[0195] However, the effects obtained through 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 description of this disclosure below.

[0196] Although this disclosure has been described with reference to embodiments shown in the figures, these embodiments are merely exemplary, and those skilled in the art should understand that various modifications and equivalents are possible.

[0197] Therefore, the scope of technical protection of this disclosure should be determined by the claims.

[0198] Exemplary embodiments have been disclosed herein, and although specific terminology has been used, it is used and interpreted in a general and descriptive sense only, and not for limiting purposes. In some instances, as will be apparent to those skilled in the art at the time of filing this application, unless otherwise specifically indicated, features, characteristics, and / or elements described in connection with particular embodiments may be used alone or in combination with features, characteristics, and / or elements described in connection with other embodiments. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the spirit and scope of the invention as set forth in the claims.

Claims

1. A battery, comprising: shell; An electrode assembly inside the housing, the electrode assembly including electrodes; A terminal component connected to the electrode, the terminal component extending from the electrode assembly; Facing the cover assembly of the electrode assembly, the cover assembly has terminals; as well as The current collector assembly between the electrode assembly and the cover assembly, The current collector assembly includes a current collector plate attached to the terminal block component and a flexible current collector that electrically connects the current collector plate and the terminal.

2. The battery according to claim 1, wherein, The flexible current collector includes: Including the main body of flexible materials; A first joining portion extending from one end of the main body portion, the first joining portion engaging with the manifold; and A second joining portion extends from the other end of the main body portion and engages with the terminal.

3. The battery according to claim 2, wherein, The main body includes a metal wire bundle.

4. The battery according to claim 3, wherein, The metal wire bundle is braided.

5. The battery according to claim 2, wherein, The first connecting portion and the current collector plate are joined together in a concave-convex joint manner.

6. The battery according to claim 5, wherein: The first mating portion includes a first mating hole, and The manifold includes a first engagement protrusion engaged in the first engagement hole.

7. The battery according to claim 2, wherein, The second mating portion and the terminal are engaged with each other in a concave-convex mating manner.

8. The battery according to claim 7, wherein: The second mating portion includes a second mating hole, and The terminal includes a second engagement protrusion engaged in the second engagement hole.

9. The battery according to claim 2, wherein, The virtual straight line connecting the first joint portion and the second joint portion is not parallel to the extension direction of the terminal block component.

10. A battery, comprising: shell; An electrode assembly disposed inside the housing, the electrode assembly comprising electrodes; A terminal component connected to the electrode, the terminal component extending from the electrode assembly; Facing the cover assembly of the electrode assembly, the cover assembly has terminals; as well as A current collector assembly is located between the electrode assembly and the cover assembly, the current collector assembly being electrically connected to the terminal piece and the terminal. The current collector assembly includes: A current collector includes a first sub-plate and a second sub-plate, the first sub-plate having a first surface not engaged with the terminal block member, and the second sub-plate extending from the first sub-plate on at least one side of the first sub-plate, the second sub-plate having a first surface engaged with the terminal block member; and A flexible current collector is attached to the second surface side of the first sub-board to electrically connect the current collector to the terminal.

11. The battery according to claim 10, wherein, The flexible current collector includes: Including the main body of flexible materials; A first joining portion extending from one end of the main body portion, the first joining portion engaging with the second surface side of the first sub-plate; and A second joining portion extends from the other end of the main body portion and engages with the terminal.

12. The battery according to claim 11, wherein, The main body includes a metal wire bundle.

13. The battery according to claim 12, wherein, The metal wire bundle is braided.

14. The battery according to claim 11, wherein, The first bonding portion and the second sub-plate are joined together in a concave-convex bonding manner.

15. The battery according to claim 14, wherein: The first mating portion includes a first mating hole, and The first subplate includes a first engagement protrusion engaged in the first engagement hole.

16. The battery according to claim 11, wherein, The second mating portion and the terminal are engaged with each other in a concave-convex mating manner.

17. The battery according to claim 16, wherein: The second mating portion includes a second mating hole, and The terminal includes a second engagement protrusion engaged in the second engagement hole.

18. The battery according to claim 11, wherein, The virtual straight line connecting the first joint portion and the second joint portion is not parallel to the extension direction of the terminal block component.

19. A battery pack, comprising: case; as well as Multiple batteries inside the casing, Each of the plurality of batteries includes: shell; An electrode assembly inside the housing, the electrode assembly including electrodes; A terminal piece component connected to and extending from the electrode assembly; Facing the cover assembly of the electrode assembly, the cover assembly has terminals; and The current collector assembly between the electrode assembly and the cover assembly, and The current collector assembly includes a current collector plate attached to the terminal block component and a flexible current collector that electrically connects the current collector plate and the terminal.

20. The battery pack according to claim 19, wherein: The current collector includes a first sub-plate and a second sub-plate. The first sub-plate has a first surface not bonded to the terminal block member. The second sub-plate extends from the first sub-plate on at least one side of the first sub-plate and has a first surface bonded to the terminal block member. The flexible current collector is coupled to the second surface side of the first sub-board to electrically connect the current collector to the terminal.

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