Rechargeable battery and rechargeable battery pack

Abstract

The present disclosure relates to a rechargeable battery and a rechargeable battery pack including the same. The rechargeable battery includes a case, an electrode assembly disposed inside the case and having a first electrode, a separator, and a second electrode, a cap assembly sealing the case and having a first terminal and a second terminal, a first tab member extending from the electrode assembly in a first direction, and a first current collector connected to the first terminal and the first tab member. The separator includes one or more of a porous substrate and a coating layer, and a resin layer having a melting point higher than each of the porous substrate and the coating layer, and the resin layer faces the first current collector.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2025-0057221, filed on April 30, 2025, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] This disclosure relates to a rechargeable battery and a rechargeable battery pack including the rechargeable battery. Background Technology

[0003] With the increasing prevalence of battery-powered electronic devices such as mobile phones, laptops, and electric vehicles, the demand for rechargeable batteries with high energy density and high capacity is growing. Therefore, improving the performance of rechargeable lithium batteries could be advantageous.

[0004] A rechargeable lithium-ion battery includes a positive electrode and a negative electrode containing active materials capable of intercalating and deintercalating lithium ions. The rechargeable lithium-ion battery generates electrical energy through oxidation and reduction reactions as lithium ions are intercalated and deintercalated from the positive electrode into the negative electrode and vice versa. A separator may be included between the positive and negative electrodes in a rechargeable lithium-ion battery. Summary of the Invention

[0005] One example embodiment aims to provide a rechargeable battery and rechargeable battery pack in which the diaphragm is not damaged during welding of the current collector and the terminal block components.

[0006] Another example embodiment aims to provide a rechargeable battery and a rechargeable battery pack that have improved battery capacity because the diaphragm is not damaged even when the length of the terminal piece is short.

[0007] According to one example embodiment, a rechargeable battery is provided, comprising: a housing; an electrode assembly disposed inside the housing and having a first electrode, a separator, and a second electrode; a cover assembly sealing the housing and having a first terminal and a second terminal; a first connecting member extending from the electrode assembly along a first direction; and a first current collector connected to the first terminal and the first connecting member, wherein the separator comprises one or more porous substrates and coatings, and a resin layer having a melting point higher than each of the porous substrates and coatings, and the resin layer faces the first current collector.

[0008] According to another example embodiment, a rechargeable battery pack is provided, the rechargeable battery pack including a housing and a plurality of rechargeable batteries disposed inside the housing, wherein each of the rechargeable batteries includes a housing, an electrode assembly disposed inside the housing and having a first electrode, a separator and a second electrode, a cover assembly sealing the housing and having a first terminal and a second terminal, a first terminal piece extending from the electrode assembly in a first direction, and a first current collector connected to the first terminal and the first terminal piece, the separator including one or more of a porous substrate and a coating layer, the separator including a resin layer with a melting point higher than each of the porous substrate and the coating layer, and the resin layer facing the first current collector. Attached Figure Description

[0009] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the detailed description thereof, further describe aspects and features of the disclosure. Therefore, the disclosure should not be construed as limited to the drawings, in which: Figure 1 This is a schematic perspective view illustrating the construction of a rechargeable battery according to an example embodiment of the present disclosure; Figure 2 This is a schematic cross-sectional view illustrating the construction of a rechargeable battery according to an exemplary embodiment of the present disclosure; Figure 3 This is a schematic exploded perspective view illustrating the construction of an electrode assembly according to an example embodiment of the present disclosure; Figure 4 This is a schematic perspective view illustrating the construction of an electrode assembly according to an exemplary embodiment of the present disclosure; Figure 5 This is a schematic cross-sectional view illustrating the construction of a first current collector and electrode assembly according to an exemplary embodiment of the present disclosure; Figure 6 This is a schematic cross-sectional view illustrating the construction of an electrode assembly of a rechargeable battery according to another exemplary embodiment of the present disclosure; Figure 7 This is a schematic cross-sectional view illustrating the construction of a first current collector and electrode assembly according to yet another exemplary embodiment of the present disclosure; and Figure 8 This is a schematic perspective view illustrating the construction of a battery pack according to an example embodiment of the present disclosure. Detailed Implementation

[0010] In the following, exemplary embodiments of the present disclosure are described in detail with reference to the accompanying drawings. It should be noted that the terms and words used in this specification and claims should not be construed as limited to their conventional or dictionary meanings. The terms and words used in this specification and claims should be interpreted in a manner that reflects the technical spirit of the present disclosure. Therefore, the exemplary embodiments described in this specification and the constructions depicted in the accompanying drawings represent only some of the exemplary embodiments of the present disclosure and do not represent the entire technical spirit of the present disclosure. Therefore, it should be understood that various equivalents and modifications may be substituted for them at the time of submission.

[0011] Furthermore, as used herein, the terms "comprising" and "including" and / or variations thereof indicate the presence of the stated shapes, quantities, steps, operations, elements, components, and / or groups thereof, without excluding the presence or addition of one or more other shapes, quantities, operations, elements, components, and / or groups. Additionally, for ease of understanding of the disclosure, the drawings may not be drawn to scale, and the dimensions of some components may be exaggerated. Furthermore, the same components in different embodiments may be assigned the same reference numerals.

[0012] The term "identical" to describe two objects of comparison means "substantially identical." Therefore, "substantially identical" can include deviations considered low in the field (e.g., within 5%). Furthermore, the uniformity of parameters over a given region can imply uniformity in terms of the mean.

[0013] Although terms such as "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another. Unless otherwise stated, a "first" component can also be a "second" component.

[0014] Throughout this specification, unless otherwise stated, each component may be singular or plural. The term "above (or below) a component" may refer not only to a component positioned in contact with the top (or bottom) surface of the component, but also to other components that may be positioned between the component and any components positioned above (or below) the component.

[0015] Furthermore, when a component is described as being “on” another component, “connected to” or “combined to” another component, it should be understood that these components may be directly connected or combined with each other, or other components may be “placed” between these components so that these components can be “connected,” “combined,” or “linked” through other components.

[0016] As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. Furthermore, when describing exemplary embodiments of this disclosure, the use of “may” refers to “one or more exemplary embodiments of this disclosure.” Expressions such as “one or more” and “at least one of…” preceding or following a list of elements modify the entire list of elements, but not individual elements within that list.

[0017] Throughout this specification, unless otherwise stated, references to "A and / or B" mean A, B, or A and B. Unless otherwise stated, references to "C through D" mean C or greater and D or less.

[0018] When a list of elements A, B, and C is specified using phrases such as “at least one of A, B, and C (species / person)” or “at least one of A, B, or C (species / person)”, these phrases can refer to any suitable combination.

[0019] The term “use” may be considered synonymous with the term “utilization”. As used herein, the terms “substantially,” “about,” and similar terms are used as terms of approximation rather than terms of degree and are intended to account for inherent biases in measurements or calculations that can be recognized by one of ordinary skill in the art.

[0020] Although terms such as “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, without departing from the teachings of the exemplary embodiments, the first element, first component, first region, first layer, or first portion discussed below may also be referred to as a second element, second component, second region, second layer, or second portion. For ease of illustration, spatial relative terms such as “below,” “under,” “lower,” “above,” and “upper” may be used herein to describe the relationship between one element or feature depicted in the accompanying drawings and another element(s). It is understood that, in addition to the orientation depicted in the figures, spatial relative positions also include different orientations of the device in use or operation. For example, if the device in the figures is flipped, an element described as “below” or “under” would be understood as “above” or “upper” the other element. Therefore, the term "under" can encompass both above and below.

[0021] The terminology used herein is intended to describe exemplary embodiments of this disclosure and is not intended to be limiting.

[0022] When the terms “about” or “substantially” are used in conjunction with numerical values ​​in this specification, it is intended that the relevant numerical values ​​include a tolerance of ±10% around the stated value. When a range is specified, the range includes all values ​​within that range, such as increments of 0.1%.

[0023] According to one example embodiment, since the separator is not damaged during the welding of the current collector and the terminal block components, the rechargeable battery and the rechargeable battery pack are not damaged. Therefore, the rechargeable battery can reduce the likelihood of short circuits during battery operation and reduce or prevent battery performance degradation.

[0024] According to another example embodiment, the rechargeable battery and rechargeable battery pack include a separator that is not damaged even when the length of the terminal piece is short. Therefore, the rechargeable battery can increase the area of ​​the active material layer in the electrode assembly, thereby increasing the battery capacity.

[0025] According to one example embodiment, a rechargeable battery includes: a housing; an electrode assembly disposed inside the housing and having a first electrode, a separator, and a second electrode; a cover assembly sealing the housing and having a first terminal and a second terminal; a first connecting member extending from the electrode assembly along a first direction; and a first current collector connected to the first terminal and the first connecting member, wherein the separator includes one or more of a porous substrate and a coating layer, and a resin layer having a higher melting point than each of the porous substrate and the coating layer, and the resin layer faces the first current collector.

[0026] According to another example embodiment, a rechargeable battery pack includes a housing and a plurality of rechargeable batteries disposed inside the housing, wherein each of the rechargeable batteries includes a housing, an electrode assembly disposed inside the housing and having a first electrode, a separator and a second electrode, a cover assembly sealing the housing and having a first terminal and a second terminal, a first terminal piece extending from the electrode assembly in a first direction, and a first current collector connected to the first terminal and the first terminal piece, the separator including one or more of a porous substrate and a coating layer, and a resin layer having a higher melting point than each of the porous substrate and the coating layer, and the resin layer facing the first current collector.

[0027] In this specification, "melting point" can be measured using conventional methods known to those skilled in the art. For example, melting point can be measured using, for instance, a differential scanning calorimeter (DSC), but the measurement method is not limited to this.

[0028] Figure 1 This is a schematic perspective view illustrating the construction of a rechargeable battery according to an example embodiment of the present disclosure. Figure 2 This is a schematic cross-sectional view illustrating the construction of a rechargeable battery according to an exemplary embodiment of the present disclosure. Figure 3This is a schematic exploded perspective view illustrating the construction of an electrode assembly according to an example embodiment of the present disclosure.

[0029] Below, examples of rechargeable batteries that are prismatic lithium-ion rechargeable batteries are described. However, this disclosure is not limited thereto, and rechargeable batteries may be or include lithium polymer batteries or cylindrical batteries.

[0030] Reference Figures 1 to 3 The rechargeable battery 1 according to this example embodiment includes a housing 100, an electrode assembly 200, a first terminal piece 301, a cover assembly 400, a first current collector 500, and a second current collector 600.

[0031] The housing 100 can form the general shape of the rechargeable battery 1 and house the electrode assembly 200.

[0032] The housing 100 may include a bottom 110, a front portion 120, a rear portion 130, a first side portion 140, and a second side portion 150.

[0033] The bottom 110 can form the lower side of the housing 100 (based on...). Figure 1 The bottom 110 according to this example embodiment may have a rectangular or generally rectangular plate shape. The bottom 110 may be disposed on... Figure 8 The bottom surface of the outer casing 11 shown.

[0034] The front portion 120, the rear portion 130, the first side portion 140, and the second side portion 150 can form the outer surface of the housing 100.

[0035] The front portion 120, rear portion 130, first side portion 140, and second side portion 150 may have an upward (based on) edge from the bottom 110. Figure 2 The extended plate shape. The front portion 120, the rear portion 130, the first side portion 140 and the second side portion 150 can be configured to surround the space above 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 configured to form a rectangular or generally rectangular cross-sectional shape.

[0036] The front portion 120 and the rear portion 130 can be positioned facing each other in the longitudinal direction of the rechargeable battery 1. The front portion 120 and the rear portion 130 can be arranged in parallel. The areas of the front portion 120 and the rear portion 130 can be the same.

[0037] The first side portion 140 and the second side portion 150 can be configured to face each other in the width direction of the rechargeable battery 1. The first side portion 140 and the second side portion 150 can be arranged in parallel. The area of ​​the first side portion 140 and the area of ​​the second side portion 150 can be the same. The area of ​​the first side portion 140 and the area of ​​the second side portion 150 can be smaller than the area of ​​the front portion 120 and the area of ​​the rear portion 130.

[0038] The housing 100 may also include an opening 160. According to this example embodiment, the opening 160 may be a space surrounded by the upper ends of a front portion 120, a rear portion 130, a first side portion 140, and a second side portion 150. The opening 160 may connect the interior and exterior spaces of the housing 100.

[0039] Therefore, the housing 100 according to this example embodiment may have a cuboid or generally cuboid shape with an open upper side.

[0040] The first direction described below can be based on Figure 2 The direction parallel to the X-axis and the direction from the first side 140 to the second side 150. The second direction can be based on... Figure 1 The direction parallel to the Y-axis and the direction from the rear 130 to the front 120. The third direction can be based on... Figure 2 The direction parallel to the Z-axis and the direction from the bottom 110 to the opening 160.

[0041] The electrode assembly 200 can form a unit structure for performing the charging and discharging operations of the rechargeable battery. The electrode assembly 200 can be housed inside the housing 100.

[0042] like Figure 3 As shown, 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.

[0043] Below, an example is described of an electrode assembly 200 having a stacked configuration in which a plurality of first electrodes 210, diaphragms 230, and second electrodes 220 are sequentially stacked in a second direction. However, the electrode assembly 200 is not limited thereto, and may have a configuration in which the stacked first electrodes 210, diaphragms 230, and second electrodes 220 are wound around a winding axis in a clockwise or counterclockwise direction.

[0044] The first electrode 210 can constitute one of the positive electrode and the negative electrode of the electrode assembly 200. Below, an example is described where the first electrode 210 is the positive electrode of the electrode assembly 200. However, the first electrode 210 is not limited to this and can also constitute the negative electrode of the electrode assembly 200.

[0045] The first electrode 210 according to this example embodiment may be 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 are not particularly limited, as long as the first electrode 210 has electrical conductivity and does not cause adverse chemical changes in the rechargeable battery. Except for Figure 3 the rectangular or substantially rectangular shape shown therein, the cross-sectional shape of the first electrode 210 may be designed to have various other shapes.

[0046] A plurality of first electrodes 210 may be provided. The plurality of first electrodes 210 may be arranged between the front portion 120 and the rear portion 130 of the housing 100 in the second direction. The number of the first electrodes 210 may be designed differently according to the charging capacity of the rechargeable battery 1 and the like.

[0047] As shown in Figure 3 at least a part of the first electrode 210, the first active material layer 211 may be applied. The first active material layer 211 may be coated on both surfaces of the first electrode 210, or alternatively, may be coated on only one surface of the first electrode 210.

[0048] In this example embodiment, since the first electrode 210 constitutes a positive electrode, the first active material layer 211 may include a positive electrode active material.

[0049] The positive electrode active material may be or include a compound (lithium intercalation compound) capable of reversibly intercalating and deintercalating lithium. For example, as the positive electrode active material, one or more composite oxides of lithium and a metal including at least one of cobalt, manganese, nickel, iron, and combinations thereof may be used.

[0050] As an example, the positive electrode active material may include at least one of lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM). Here, 0<x<1, 0<y<1, 0<z<1, and x+y+z=1 may be satisfied. The positive electrode active material may include only one of lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Co y Mn z O2, NCM), or may include lithium iron phosphate oxide (LiFePO4, LFP), lithium manganese iron phosphate oxide (LiMnFePO4, LMFP), and lithium nickel cobalt manganese oxide (LiNi x Coy Mn z Two or all of O2 and NCM.

[0051] The first active material layer 211 may also include a positive electrode conductive material.

[0052] The positive electrode conductive material can impart conductivity to the first active material layer 211, and can be any material that serves as an electrical conductive material without causing adverse chemical changes in the battery. Examples of positive electrode conductive materials may include: carbon-based materials, such as at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metallic materials, including at least one of copper, nickel, aluminum, silver, etc., in the form of metal powder or metal fiber; conductive polymers, such as polyphenylene derivatives, etc.; or mixtures thereof.

[0053] The first active material layer 211 may also include a positive electrode binder.

[0054] The positive electrode binder attaches the particles constituting the positive electrode active material to each other and attaches the positive electrode active material to the first electrode 210.

[0055] Examples of positive electrode adhesives may include non-aqueous adhesives, aqueous adhesives, dry adhesives, or combinations thereof.

[0056] Non-aqueous adhesives may include at least one of polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, or combinations thereof.

[0057] The waterborne adhesive may be or include at least one of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomer, 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.

[0058] When using an aqueous binder as the positive electrode binder, the aqueous binder may also include a cellulose-based compound capable of imparting 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 or include at least one of Na, K, or Li.

[0059] Dry adhesives may be or include fibrous polymeric materials, such as at least one of polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0060] 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 this exemplary embodiment, the first uncoated portion 212 may be disposed in an end region of the first electrode 210 located inside the housing 100 facing the first side portion 140. However, the first uncoated portion 212 is not limited thereto, and may be formed over the entire edge region of the first electrode 210.

[0061] The second electrode 220 can constitute one of the positive and negative electrodes of the electrode assembly 200. Below, an example is described where the second electrode 220 is the negative electrode of the electrode assembly 200. However, the second electrode 220 is not limited to this and can also constitute the positive electrode of the electrode assembly 200.

[0062] Multiple second electrodes 220 can be provided. These multiple second electrodes 220 can be arranged in a second direction between the front portion 120 and the rear portion 130 of the housing 100. The first electrode 210 and the second electrode 220 can be alternately arranged along the second direction. The second electrode 220 can be spaced apart from the first electrode 210 in the second direction at a predetermined or desired distance.

[0063] The second electrode 220 according to this example embodiment may be in the form of a foil comprising a metallic material (such as or including at least one of copper, copper alloys, nickel, or nickel alloys). There are no particular limitations on the type, size, shape, etc., of the second electrode 220, as long as the second electrode 220 is conductive and does not cause adverse chemical changes in the rechargeable battery. Except... Figure 3 In addition to the rectangular or roughly rectangular shape shown, the cross-sectional shape of the second electrode 220 can be designed to have various other shapes.

[0064] The second active material layer 221 may be applied to at least a portion of the second electrode 220. The second active material layer 221 may be applied to both surfaces of the second electrode 220, or alternatively, it may be applied to only one surface of the second electrode 220.

[0065] Since the second electrode 220 constitutes a negative electrode, the second active material layer 221 may include a negative electrode active material.

[0066] The negative electrode active material may include at least one of the following: a material capable of reversibly inserting / deintercalating lithium ions, lithium metal, an alloy of lithium and metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0067] The material capable of reversibly intercalating / deintercalating lithium ions may be or include a carbon-based negative electrode active material, and the carbon-based negative electrode active material may include, for example, crystalline carbon, amorphous carbon, or a combination thereof. Examples of crystalline carbon may include graphite, such as amorphous, plate-like, flake-like, spherical or fibrous natural graphite or artificial graphite, and examples of amorphous carbon may include at least one of soft carbon, hard carbon, mesophase pitch carbide, calcined coke, and the like.

[0068] As the alloy of lithium and a metal, an alloy of lithium and a metal such as or including at least one of Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al and Sn may be used.

[0069] As the material capable of doping and dedoping 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 or include silicon, a silicon-carbon composite, SiO x (0<x≤2), a Si-Q alloy (Q is or includes at least one of an alkali metal, an alkaline earth metal, a Group 13 element, a Group 14 element (excluding Si), a Group 15 element, a Group 16 element, a transition metal, a rare earth element, and combinations thereof), or at least one of combinations thereof. The Sn-based negative electrode active material may be or include at least one of Sn, SnO₂, a Sn-based alloy, or combinations thereof.

[0070] The silicon-carbon composite may be or include a composite of silicon and amorphous carbon. According to an example embodiment, the silicon-carbon composite may be in the form of silicon particles having surfaces coated with amorphous carbon. For example, the silicon-carbon composite may include secondary particles (core) formed by aggregation of primary silicon particles and an amorphous carbon coating layer (shell) positioned on the surfaces of the secondary particles. Amorphous carbon may be positioned between the primary silicon particles, for example, such that the primary silicon particles may be coated with amorphous carbon. The secondary particles may be dispersed in an amorphous carbon matrix.

[0071] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles, and an amorphous carbon coating layer positioned on a surface of the core.

[0072] The Si-based negative electrode active material or the Sn-based negative electrode active material may be used in combination with the carbon-based negative electrode active material.

[0073] The second active material layer 221 may further include a negative electrode conductive material and a negative electrode binder.

[0074] The negative electrode conductive material can impart conductivity to the second active material layer 221, and can be any material used as an electrical conductive material without causing adverse chemical changes in the battery. Examples of negative electrode conductive materials may include: carbon-based materials, such as at least one of natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber, carbon nanotube, etc.; metallic materials, including at least one of copper, nickel, aluminum, silver, etc., in the form of metal powder or metal fiber; conductive polymers, such as polyphenylene derivatives, etc.; or mixtures thereof.

[0075] The negative electrode binder attaches the particles constituting the negative electrode active material to each other and attaches the negative electrode active material to the second electrode 220.

[0076] Examples of negative electrode adhesives may include non-aqueous adhesives, aqueous adhesives, dry adhesives, or combinations thereof.

[0077] Non-aqueous adhesives may include at least one of polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene-propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamide-imide, polyimide, or combinations thereof.

[0078] The waterborne adhesive may be or include at least one of styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomer, 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.

[0079] When using an aqueous binder as the negative electrode binder, the aqueous binder may also include a cellulose-based compound capable of imparting 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 or include at least one of Na, K, or Li.

[0080] Dry adhesives may be or include fibrous polymeric materials, such as at least one of polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0081] 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 this exemplary embodiment, the second uncoated portion 222 may be disposed in the region of the other end of the second electrode 220 located inside the housing 100 facing the second side portion 150. However, the second uncoated portion 222 is not limited thereto, and may be formed over the entire edge region of the second electrode 220.

[0082] A diaphragm 230 may be disposed between the first electrode 210 and the second electrode 220. The diaphragm 230 may reduce or prevent 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.

[0083] The diaphragm 230 can be configured to completely cover the surface area of ​​the electrode assembly 200. Therefore, the diaphragm 230 can reduce or prevent the first electrode 210 and the second electrode 220 from being directly exposed to the outside of the electrode assembly 200.

[0084] As the diaphragm 230, a multilayer membrane consisting of at least one of polyethylene, polypropylene, and polyvinylidene fluoride, or two or more layers thereof, can be used, and mixed multilayer membranes such as polyethylene / polypropylene double-layer membranes, polyethylene / polypropylene / polyethylene triple-layer membranes, or polypropylene / polyethylene / polypropylene triple-layer membranes can be used.

[0085] The diaphragm 230 may include at least one of a porous substrate and a coating layer, the coating layer comprising an organic material, an inorganic material, or a combination thereof, and located on one or both surfaces of the porous substrate.

[0086] The porous substrate may be or includes a polymer membrane, which is formed of or comprises a polymer such as or includes 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, and polytetrafluoroethylene (e.g., Teflon). ® A copolymer or mixture of two or more of the following materials: ( )

[0087] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylic acid polymers.

[0088] Inorganic materials may include inorganic particles, such as or including at least one of Al2O3, SiO2, TiO2, SnO2, CeO2, MgO, NiO, CaO, GaO, ZnO, ZrO2, Y2O3, SrTiO3, BaTiO3, Mg(OH)2, boehmite, and combinations thereof, but are not limited thereto.

[0089] Organic and inorganic materials can exist as a mixture in a coating layer, or as a combination of coating layers containing organic materials and coating layers containing inorganic materials stacked on top of each other.

[0090] The diaphragm 230 also includes a resin layer 231, which will be described below. The resin layer 231 is described in detail below.

[0091] The first terminal member 301 can be connected to the first electrode 210. When the first electrode 210 is exemplified as a positive electrode, the first terminal member 301 can constitute the positive electrode terminal of the rechargeable battery 1. However, the first terminal member 301 is not limited thereto; when the first electrode 210 is a negative electrode, the first terminal member 301 can constitute the negative electrode terminal of the rechargeable battery 1.

[0092] The first contact member 301 may extend from the electrode assembly 200 along a first direction. For example, the first contact member 301 may extend from the electrode assembly 200 toward the first side 140 inside the housing 100.

[0093] Multiple first connector members 301 may be provided. The multiple first connector members 301 may be arranged along a third direction. As an example, a pair of first connector members 301 may be formed according to this example embodiment, and the pair of first connector members 301 may be arranged to be spaced apart from each other at a predetermined or desired distance in a third direction.

[0094] The first connector component 301 according to this example embodiment may include a plurality of first connectors 310.

[0095] The first terminal block 310 according to this example embodiment may be in the form of a foil extending from the first uncoated portion 212 of the first electrode 210 along a first direction. The first terminal block 310 may have a generally rectangular shape. However, the shape of the first terminal block 310 is not limited to this, and may be designed to have various shapes.

[0096] The first terminal block 310 can be integrally formed with the first electrode 210.

[0097] The number of first tabs 310 can be the same as the number of first electrodes 210. Each first tab 310 can extend individually from the first uncoated portion 212 of a different first electrode 210. Adjacent first tabs 310 can face each other in a second direction. That is, a plurality of first tabs 310 can be arranged along the second direction. Adjacent first tabs 310 can be arranged in parallel. Therefore, the first tab member 301 according to this example embodiment can be an assembly of a plurality of first tabs 310 arranged along the second direction. In addition, the first end surface 301a can be an assembly of the end surfaces of a plurality of first tabs 310 arranged along the second direction. Adjacent first tabs 310 can contact each other and can also be spaced apart by the thickness of the diaphragm 230.

[0098] The rechargeable battery 1 according to this example embodiment may also include a second terminal piece 302.

[0099] The second terminal member 302 can be connected to the second electrode 220. When the second electrode 220 is exemplified as a negative electrode, the second terminal member 302 can constitute the negative electrode terminal of the rechargeable battery 1. However, the second terminal member 302 is not limited thereto; when the second electrode 220 is a positive electrode, the second terminal member 302 can constitute the positive electrode terminal of the rechargeable battery 1.

[0100] The second contact member 302 can extend from the electrode assembly 200 in a direction opposite to the first direction. For example, the second contact member 302 can extend from the electrode assembly 200 toward the second side 150 inside the housing 100. That is, the first contact member 301 and the second contact member 302 can extend from the electrode assembly 200 in opposite directions.

[0101] Multiple second connector members 302 may be provided. The multiple second connector members 302 may be arranged along a third direction. As an example, a pair of second connector members 302 may be formed according to this example embodiment, and the pair of second connector members 302 may be arranged to be spaced apart from each other at a predetermined or desired distance in a third direction.

[0102] The second connector component 302 may include a plurality of second connectors 320.

[0103] The second terminal block 320 according to this example embodiment may be in the form of a foil extending from the second uncoated portion 222 of the second electrode 220 in a direction opposite to the first direction. The second terminal block 320 may have a generally rectangular shape. However, the shape of the second terminal block 320 is not limited thereto, and the second terminal block 320 may be designed to have various shapes.

[0104] The second contact piece 320 can be integrally formed with the second electrode 220. For example, the second contact piece 320 can 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 contact piece 320 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 contact piece 320 can be the same as the material of the second electrode 220.

[0105] The number of second tabs 320 can be the same as the number of second electrodes 220. Each second tab 320 can extend individually from the second uncoated portion 222 of a different second electrode 220. Adjacent second tabs 320 can be arranged facing each other in a second direction. That is, a plurality of second tabs 320 can be arranged along the second direction. Adjacent second tabs 320 can be arranged in parallel. Therefore, the second tab member 302 according to this example embodiment can be an assembly of a plurality of second tabs 320 arranged along the second direction. In addition, the second end surface 302a can be an assembly of the end surfaces of a plurality of second tabs 320 arranged along the second direction. Adjacent second tabs 320 can contact each other and can also be spaced apart by the thickness of the diaphragm 230.

[0106] The cover assembly 400 can be coupled to the housing 100 to seal the housing 100. The cover assembly 400 can be configured to face the electrode assembly 200 on the third-side.

[0107] The cover assembly 400 may include a cover plate 410, a first terminal 420, and a second terminal 430.

[0108] The cover plate 410 can form the general appearance of the cover assembly 400 and can support both the first terminal 420 and the second terminal 430.

[0109] The cover plate 410 may have a flat shape. The cover plate 410 may be disposed in the opening 160 of the housing 100. The cover plate 410 may be configured to face the electrode assembly 200 in a third direction parallel to the Z-axis. That is, the cover plate 410 may be disposed at a position spaced apart from the electrode assembly 200 along the third direction at a predetermined or desired distance. The cover plate 410 may be configured to be parallel to the bottom 110 of the housing 100.

[0110] The cover plate 410 can be mounted on the upper end of the housing 100 (e.g., the upper end of the front 120, rear 130, first side 140, and second side 150). The cover plate 410 can be connected to the housing 100 by various types of joining methods such as welding, bolting, assembly, etc.

[0111] The first terminal 420 can protrude outward from the cover plate 410. The first terminal 420 can be electrically connected to the first electrode 210. Since the first electrode 210 according to this example embodiment constitutes a positive electrode, the first terminal 420 can be exemplified as the positive electrode terminal of the rechargeable battery 1.

[0112] The first terminal 420 can be inserted into the cover plate 410. The upper end of the first terminal 420 can protrude from the cover plate 410 in a third direction. Although Figure 2 An example of a first terminal 420 having a rectangular or generally rectangular cross-sectional shape is shown, but the cross-sectional shape of the first terminal 420 is not limited to this and can be designed to have various shapes such as circular, elliptical, polygonal, etc. The first terminal 420 may be formed of or include an electrically conductive material (such as aluminum, nickel, copper, etc.).

[0113] The second terminal 430 may protrude outward from the cover plate 410 at a position spaced apart from the first terminal 420. The second terminal 430 may be electrically connected to the second electrode 220. Since the second electrode 220 according to this exemplary embodiment constitutes a negative electrode, the second terminal 430 may be exemplified as the negative electrode terminal of the rechargeable battery 1.

[0114] The second terminal 430 can be inserted into the cover plate 410. The upper end of the second terminal 430 can protrude from the cover plate 410 in a third direction. Although Figure 2 An example is shown where the second terminal 430 has a rectangular or substantially rectangular cross-sectional shape; however, the cross-sectional shape of the second terminal 430 is not limited to this and can be designed to have various shapes such as circular, elliptical, polygonal, etc. The second terminal 430 can be formed of or include electrically conductive materials such as aluminum, nickel, copper, etc. The second terminal 430 can be positioned at a predetermined or desired distance from the first terminal 420 along a first direction.

[0115] A first washer 421 can be installed between the cover plate 410 and the first terminal 420. A second washer 431 can be installed between the cover plate 410 and the second terminal 430. The cover assembly 400 may also include a vent 440, a vent port 450, an electrolyte injection port 460, and an insulating plate 470. The vent 440 and vent port 450 are conventional components, therefore their description is omitted.

[0116] The following reference Figure 4 and Figure 5 A rechargeable battery according to an example embodiment of the present disclosure is described in detail.

[0117] The separator 230 includes a resin layer 231. The resin layer 231 includes a resin with a melting point higher than that of each of the porous substrate and the coating layer. Therefore, due to the higher heat resistance of the separator 230, damage to the separator can be reduced when it is exposed to heat during the battery manufacturing process or during the charge and discharge of the battery.

[0118] The first current collector 500 can be connected to the first terminal 420 and the electrode assembly 200, and can electrically connect the first terminal 420 and the electrode assembly 200. The first current collector 500 can be formed of or include an electrically conductive material (such as aluminum, copper, nickel, etc.).

[0119] The first current collector 500 may include a first terminal block 510 and a first current collector plate 520.

[0120] The first terminal plate 510 can be connected to the first terminal 420 and is disposed between the electrode assembly 200 and the first terminal 420. The first terminal plate 510 can be spaced apart from the lower surface of the first terminal 420 at a predetermined or desired distance in a third direction. The first terminal plate 510 can be mechanically connected and electrically connected to the first terminal 420 by riveting, bolting, or other means. Optionally, the first terminal plate 510 can be in direct contact with the lower surface of the first terminal 420 and can be mechanically connected and electrically connected to the first terminal 420 by welding or other means.

[0121] The first current collector 520 may extend from the first terminal plate 510 in a direction opposite to that of the third party. The first current collector 520 may be positioned between the first terminal piece member 301 (e.g., the first terminal piece 310) and the first terminal plate 510, and the first current collector 520 may be connected to the first terminal piece member 301 (e.g., the first terminal piece 310).

[0122] The first connector component 301 (e.g., the first connector 310) can be welded to the first current collector plate 520.

[0123] Welding can include, but is not limited to, welding performed by laser irradiation. Welding performed by laser irradiation is described below, but the welding method is not particularly limited; heat can be applied even when heat is not applied by laser.

[0124] Welding is a method of applying heat to a first current collector plate 520 by irradiating it with a laser to melt the first current collector plate 520, and then joining the first terminal block member 301 (e.g., the first terminal block 310). For example, welding can be performed by applying heat to the first current collector plate 520 to melt it, forming a first weld line 521 on the first current collector plate 520, and the first terminal block member 301 (e.g., the first terminal block 310) can be connected to the first weld line 521.

[0125] Depending on the number of first connector components 301 (e.g., first connector 310), multiple first welding lines 521 can be formed on the first current collector plate 520. Optionally, the first welding lines 521 can be connected to form a single welding area.

[0126] Welding can enhance battery reliability by reducing or preventing the separation of the first current collector plate 520 and the first terminal piece member 301 (e.g., the first terminal piece 310) from each other during battery charging and discharging. However, welding may damage the separator 230, particularly the portion of the separator 230 facing the first current collector 500, and especially the portion of the separator 230 facing the first weld line 521.

[0127] The resin layer 231 faces the first current collector 500. Here, "facing" means that the resin layer 231 is formed along... Figure 4 and Figure 5 The resin layer 231 extends in the third direction (Z-axis) and the first current collector 500 is formed in the same direction as the resin layer 231. Therefore, the resin layer 231 can reduce or prevent damage to the separator 230 due to heat generated during welding. Furthermore, even when the length of the first terminal member 301 (e.g., the first terminal 310) is shortened, the resin layer 231 can increase the battery capacity by reducing or preventing damage to the separator. A method of forming the separator 230 itself with resin included in the resin layer is conceivable, but this may increase the permeability of the separator 230.

[0128] The resin layer 231 may face the first current collector plate 520 of the first current collector 500. Here, "facing" means that the resin layer 231 is formed along... Figure 4 and Figure 5 The resin layer 231 extends in the third direction (Z-axis) and is formed such that the direction of extension is the same as the length direction of the first current collector 520. Therefore, the resin layer 231 can reduce or prevent damage to the diaphragm 230 due to welding.

[0129] The resin layer 231 may face the first welding line 521 of the first current collector 500. Here, "facing" means that the resin layer 231 is formed along... Figure 4 and Figure 5The resin layer 231 extends in the third direction (Z-axis) and is formed such that the direction of extension (i.e., the third direction) is the same as the length direction of the first weld line 521. Therefore, the resin layer 231 can reduce or prevent damage to the diaphragm 230 due to welding.

[0130] The resin layer 231 has a predetermined or desired length and a predetermined or desired width. Figure 3 and Figure 4 The length of resin layer 231 is defined on the third direction (Z-axis) and in Figure 3 and Figure 4 The width of resin layer 231 is defined in the first direction (X-axis).

[0131] The length of the resin layer 231 can be greater than the length of the first weld line 521 and less than the length of the first current collector 520. Therefore, damage to the diaphragm due to welding can be sufficiently reduced or prevented, and the increase in diaphragm permeability due to unnecessary resin layers can be reduced or prevented.

[0132] The width of the resin layer 231 may be less than the length of the first terminal member 301 (e.g., the first terminal 310) in the first direction. Therefore, the resin layer 231 is formed only in the uncoated area of ​​the first electrode and not in the area of ​​the diaphragm that is in contact with the active material layer, thereby reducing or preventing an increase in the permeability of the diaphragm.

[0133] In one example, the width of the resin layer 231 may be in the range of about 10% to about 50% (e.g., 20% to 30%) of the length of the first terminal piece 301 (e.g., the first terminal piece 310). Within this range, damage to the diaphragm due to welding can be reduced or prevented, and an increase in the permeability of the diaphragm can be reduced or prevented.

[0134] In one example, the width of the resin layer 231 may be in the range of about 0.1 μm to about 20 μm, but is not limited thereto.

[0135] The distance between the first weld line 521 and the resin layer 231 can be the same as the length of the first connector member 301 (e.g., the first connector 310). Therefore, the resin layer can quickly reduce or prevent damage to the diaphragm caused by the first weld line.

[0136] The resin layer 231 may be formed only at the end of the diaphragm 230 in the first direction.

[0137] In one example, the diaphragm may include a porous substrate and a resin layer formed only on at least one surface of the porous substrate at an end in a first direction.

[0138] In another example, the diaphragm may include a porous substrate, a coating layer formed on at least one surface of the porous substrate, and a resin layer formed only on one surface of the coating layer at an end in a first direction.

[0139] The resin layer 231 may extend along a third direction intersecting the first direction and extend into the region including the first terminal member 301 (e.g., the first terminal 310). Therefore, damage to the diaphragm due to welding of the first terminal member 301 (e.g., the first terminal 310) and the first current collector 520 can be reduced or prevented.

[0140] The resin layer 231 comprises a resin having a higher melting point than each of the porous substrate of the diaphragm and the coating layer.

[0141] The resin may include one or more of, for example, polyimide resins, polyamide resins, polyamide-imide resins, polyurethane resins, and polycarbonate resins. Polyimide resins may include resins having a portion of the following chemical formula 1. Polyamide resins may include resins having a portion of the following chemical formula 2. The resin may include resins having both portions of the following chemical formula 1 and chemical formula 2.

[0142] Chemical Formula 1: .

[0143] In chemical formula 1, It is the connecting part of the element, R 1 It is or includes a tetravalent organic group, and R 2 It is or includes divalent aliphatic, alicyclic, or aromatic organic groups, or combinations thereof, having a total of 3 to 30 carbon atoms.

[0144] Chemical formula 2: -(-R 1 -(C=O)-N(R 2 )-)- .

[0145] In chemical formula 2, It is the connecting part of the element, R 1 It is or includes an alkylene group having 6 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms, R 2 It is hydrogen or an alkyl group having 6 to 10 carbon atoms or an aryl group having 6 to 10 carbon atoms.

[0146] For example, the resin may include polyimide resins. Polyimide resins can reduce or prevent damage to the diaphragm due to welding and have desired or improved durability when impregnated with electrolytes.

[0147] For example, the weight-average molecular weight of polyimide resins can range from about 50,000 g / mol to about 2 million g / mol, for example, from 10 g / mol to 1 million g / mol. Within these ranges, polyimide resins readily form a coating on the membrane and have high heat resistance, thus preventing damage from heat generated during welding.

[0148] The resin layer 231 may have a thickness ranging from about 0.1 μm to about 20 μm. Within this range, damage to the diaphragm due to welding can be reduced or prevented, and an increase in the ionic conductivity of the diaphragm can be reduced or prevented.

[0149] The resin layer 231 may have a uniform or substantially uniform thickness. Optionally, the resin layer 231 may have a thickness that decreases along the first direction away from the first current collector 520.

[0150] The resin layer 231 may not have a pattern including resin, but may have a predetermined or desired pattern. This may vary depending on the method of forming the resin layer 231.

[0151] The resin layer 231 can be formed by spraying resin during the diaphragm manufacturing process, but is not limited to this.

[0152] The second current collector 600 may include a second terminal block 610 and a second current collector block 620.

[0153] Figure 6 This is a cross-sectional view illustrating an electrode assembly included in a rechargeable battery according to another exemplary embodiment of the present disclosure.

[0154] Reference Figure 6 The rechargeable battery includes an electrode assembly 200, which includes a separator 230. The separator 230 is bent multiple times by alternating bends in a zigzag or serpentine shape on one side and the other side. The rechargeable battery is substantially the same as the rechargeable battery according to the above example embodiment, except that the rechargeable battery includes a first electrode 210 inserted into one bend of the separator and having a first connecting tab member 301 (first connecting tab 310) and a second electrode 220 inserted into the other bend of the separator.

[0155] The diaphragm 230 includes one or more porous substrates and coating layers, and a resin layer 231 having a higher melting point than each of the porous substrates and coating layers.

[0156] The resin layer 231 can be formed on one or more sides of the inner and outer sides of the unilateral bend. In one example, the resin layer can be formed only on the inner side of the unilateral bend, only on the outer side of the unilateral bend, or on both the inner and outer sides of the unilateral bend. For example, as... Figure 6 As shown, the resin layer can be formed on both the inner and outer sides of the curved portion on one side, thereby reducing or preventing damage to the diaphragm due to welding.

[0157] The resin layer formed on the inner side of the unilateral bend can be thinner than the resin layer formed on the outer side of the unilateral bend. Therefore, it is possible to reduce the force applied to the diaphragm when bending the diaphragm in a zigzag or serpentine shape to form the unilateral bend and the other unilateral bend.

[0158] The resin layer formed on the inner side of the unilateral bend can comprise a resin having a lower weight-average molecular weight than the resin layer formed on the outer side of the unilateral bend. Therefore, it is possible to reduce the force applied to the diaphragm when bending the diaphragm in a zigzag or serpentine shape to form the unilateral and contralateral bends. The weight-average molecular weight can be obtained, for example, as a polystyrene equivalent using gel permeation chromatography (GPC), but is not limited to this method.

[0159] Figure 7 This is a cross-sectional view showing an electrode assembly included in a rechargeable battery according to yet another exemplary embodiment of the present disclosure.

[0160] Reference Figure 7 The rechargeable battery includes an electrode assembly 200, which includes a separator 230. The separator 230 is bent multiple times by alternating bends in a zigzag or serpentine shape on one side and the other side. The rechargeable battery is substantially the same as the rechargeable battery according to the above-described example embodiment, except that the rechargeable battery includes a first electrode 210 inserted into one side bend of the separator 230 and having a first terminal piece 301 (first terminal piece 310) and a second electrode 220 inserted into the other side bend of the separator 230.

[0161] The resin layer 231 may be formed on one or more sides of the inner and outer sides of the unilateral bend. In one example, the resin layer may be formed only on the inner side of the unilateral bend, only on the outer side of the unilateral bend, or on both the inner and outer sides of the unilateral bend. For example, the resin layer may be formed on both the inner and outer sides of the unilateral bend to reduce or prevent damage to the diaphragm due to welding.

[0162] The one-sided bend includes a pair of planar regions 230a facing the first current collector, and a bend connecting region 230b connecting the pair of planar regions 230a. The resin layer 231 may be formed only on the planar regions 230a, and may not be formed on the bend connecting region 230b. Therefore, the force applied to the diaphragm when the diaphragm is bent in a zigzag or serpentine shape to form the one-sided bend and the other-sided bend of the diaphragm can be reduced.

[0163] The other curved portion of the diaphragm includes a pair of planar regions 230c facing the first current collector, and a curved connecting region 230d connecting the pair of planar regions 230c. The resin layer 231 may be formed only on the planar regions 230c and may not be formed on the curved connecting region 230d. Therefore, the force applied to the diaphragm when it is bent in a zigzag or serpentine shape to form the curved portions on one and the other sides of the diaphragm can be reduced.

[0164] The above describes the case where a resin layer 231 is formed for the first terminal block member 301 (e.g., the first terminal block 310), but a resin layer 231 can also be formed for the second terminal block member 302 (e.g., the second terminal block 320) in the same manner.

[0165] Figure 8 This is a schematic perspective view illustrating the construction of a battery pack according to an example embodiment of the present disclosure.

[0166] The battery pack may include a housing 10, a rechargeable battery 1, and a busbar 3.

[0167] The housing 10 can form the general shape of the battery pack and provide space therein to accommodate the rechargeable battery 1.

[0168] According to this example embodiment, the housing 10 may include a housing body 11 and a cover 12.

[0169] The outer casing 11 can have a box shape with an empty interior and can have an open side. The cross-sectional shape of the outer casing 11 is not limited to... Figure 8 The shape shown is rectangular or roughly rectangular, but it can be designed to have various shapes, such as polygons, circles, ellipses, etc. The cover 12 can be fixed to the outer shell body 11 by various types of joining methods (such as bolting, welding, assembly, etc.).

[0170] Multiple rechargeable batteries 1 can be provided. The multiple rechargeable batteries 1 can be arranged along the length of the casing 10 (based on...). Figure 8 (in the X-axis direction) and width direction (based on) Figure 8 Arranged in two or more rows in at least one of the directions of the Y-axis. Figure 8An example is shown where multiple rechargeable batteries 1 are arranged in twelve rows along the length of the housing 10; however, the arrangement of the multiple rechargeable batteries 1 is not limited to this and can be designed in various forms. The multiple rechargeable batteries 1 can be arranged in parallel. The number of rechargeable batteries 1 can be designed in various ways according to the size, shape, etc. of the housing 10.

[0171] Multiple rechargeable batteries 1 can be electrically connected via busbars 3. The multiple busbars 3 can be supported inside the housing 10 by busbar retainers H.

[0172] According to one example embodiment, since the diaphragm is not damaged when welding the current collector and the terminal block components, the rechargeable battery and the rechargeable battery pack are not damaged or are substantially undamaged.

[0173] According to another example embodiment, the rechargeable battery and rechargeable battery pack exhibit improved battery capacity because the diaphragm is not damaged even when the length of the terminal piece is short.

[0174] Although exemplary embodiments of the present disclosure have been described above, the present disclosure is not limited thereto, and various modifications can be made within the scope of the claims, detailed description and drawings of the present disclosure, and such modifications also fall within the scope of the present disclosure.

Claims

1. A rechargeable battery, said rechargeable battery comprising: case; An electrode assembly is disposed inside the housing and has a first electrode, a diaphragm, and a second electrode. The cover assembly seals the housing and has a first terminal and a second terminal; A first terminal component extends from the electrode assembly along a first direction; as well as The first current collector is connected to the first terminal and the first terminal piece. The membrane comprises one or more porous substrates and coating layers, and a resin layer having a melting point higher than each of the porous substrate and the coating layer. The resin layer is positioned opposite the first current collector.

2. The rechargeable battery according to claim 1, wherein, The first current collector includes a first current collector plate and a first terminal plate, and the resin layer is opposite to the first current collector plate.

3. The rechargeable battery according to claim 2, wherein, The first current collector plate has a first welding line, the first terminal piece is connected to the first welding line, and the resin layer is opposite to the first welding line.

4. The rechargeable battery according to claim 3, wherein, The length of the resin layer is greater than the length of the first welding line and less than the length of the first current collector plate.

5. The rechargeable battery according to claim 3, wherein, The width of the resin layer in the first direction is less than the length of the first terminal piece in the first direction.

6. The rechargeable battery according to claim 3, wherein, The distance between the first welding line and the resin layer is the same as the length of the first connector component.

7. The rechargeable battery according to claim 3, wherein, The resin layer is positioned at the end of the diaphragm in the first direction and extends along a third direction intersecting the first direction.

8. The rechargeable battery according to claim 3, further comprising a plurality of first terminal piece components positioned along a third direction intersecting the first direction. in, The resin layer extends along the third direction into the region including the plurality of first terminal piece components.

9. The rechargeable battery according to claim 3, wherein, The resin layer includes one or more of polyimide resins, polyamide resins, polyamide-imide resins, polyurethane resins, and polycarbonate resins.

10. The rechargeable battery according to claim 3, wherein, The electrode assembly is formed by sequentially stacking the first electrode, the diaphragm, and the second electrode.

11. The rechargeable battery according to claim 3, wherein, The electrode assembly includes: the diaphragm, which is bent multiple times by alternating bends on one side and the other side in a serpentine shape; a first electrode, inserted into the bend of the diaphragm on one side and having a first connecting piece member; and a second electrode, inserted into the bend of the diaphragm on the other side.

12. The rechargeable battery according to claim 11, wherein, The resin layer is formed on one or more sides of the inner and outer sides of the bend.

13. The rechargeable battery according to claim 12, wherein, The resin layer formed on the inner side is thinner than the resin layer formed on the outer side.

14. The rechargeable battery according to claim 12, wherein, The resin layer formed on the inner side has a lower weight-average molecular weight than the resin layer formed on the outer side.

15. A rechargeable battery pack, the rechargeable battery pack comprising: shell; as well as Multiple rechargeable batteries are disposed inside the housing. Each of the plurality of rechargeable batteries includes: a housing; an electrode assembly disposed inside the housing and having a first electrode, a separator, and a second electrode; a cover assembly sealing the housing and having a first terminal and a second terminal; a first connecting piece extending from the electrode assembly along a first direction; and a first current collector connected to the first terminal and the first connecting piece. The diaphragm comprises one or more of a porous substrate and a coating layer. The diaphragm comprises a resin layer having a melting point higher than each of the porous substrate and the coating layer, and The resin layer is positioned opposite the first current collector.

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