Connection member and battery pack

Abstract

A connecting member and a battery pack including the connecting member are disclosed. The connecting member includes: a first member having an insertion channel on one side thereon; and a second member having an insertion portion on one side thereon, the insertion portion being inserted into the insertion channel and connected to the first member.

Description

Cross-references to related applications

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0198858, filed on December 27, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] An aspect of the embodiments of this disclosure relates to a connecting member and a battery pack including the connecting member. Background Technology

[0003] Generally speaking, with the rapid proliferation of battery-powered electronic devices such as mobile phones, laptops, and electric vehicles, the demand for high-energy-density and high-capacity battery cells is increasing rapidly. Correspondingly, research and development to improve the performance of lithium-ion battery cells is actively underway.

[0004] A lithium battery cell is a battery that includes a positive electrode, a negative electrode, and an electrolyte. The positive and negative electrodes contain active materials capable of inserting and deintercalating lithium ions. The lithium battery cell generates electrical energy through oxidation and reduction reactions when lithium ions are inserted into or deintercalated from the positive and negative electrodes.

[0005] A single battery cell can be used either individually or as a battery module or battery pack, which is a unit formed by connecting multiple battery cells.

[0006] The information disclosed in the background section of this invention is provided to enhance understanding of the background of this invention, and may therefore include information that does not constitute related technology. Summary of the Invention

[0007] According to one aspect of an embodiment of the present invention, a connecting member configured to connect two or more battery cells and / or a battery pack including the connecting member is provided.

[0008] According to another aspect of an embodiment of the present invention, a battery pack including a connecting member comprising two or more materials is provided.

[0009] According to another aspect of the embodiments of the present invention, a connecting member including a sandwich structure and / or a battery pack including the connecting member is provided.

[0010] According to another aspect of the embodiments of the present invention, a battery pack having a high-strength connecting member and / or including the connecting member is provided.

[0011] According to another aspect of the embodiments of the present invention, a connection member having high welding reliability with a battery cell and / or a battery pack including the connection member is provided.

[0012] However, the aspects of the present invention and the technical problems to be solved by the present invention are not limited to the aspects and problems described above, and those skilled in the art can clearly understand other aspects and problems not described from the following description of the present invention.

[0013] According to one or more embodiments of the present invention, a connecting member includes: a first member having an insertion channel on one side thereon; and a second member having an insertion portion on one side thereon, and being connected to the first member when the insertion portion is inserted into the insertion channel.

[0014] According to one or more embodiments of the present invention, a battery pack includes: a plurality of battery cells, each of the plurality of battery cells including a first terminal and a second terminal; and a connecting member electrically connecting at least some of the plurality of battery cells, wherein the connecting member includes: a first member including an insertion channel and a first engagement portion, the insertion channel being located on a first side of the first member, the first engagement portion being located on a second side of the first member and engaging with the first terminal of the battery cell among the plurality of battery cells; and a second member including an insertion portion and a second engagement portion, the insertion portion being located on a first side of the second member and inserted into the insertion channel and connected to the first member, the second engagement portion being located on a second side of the second member and engaging with the second terminal of the battery cell among the plurality of battery cells. Attached Figure Description

[0015] The following accompanying drawings illustrate some embodiments of the invention, and aspects and features of the invention are further described together with the detailed description of the invention. However, the invention should not be construed as limited to the drawings, in which:

[0016] Figure 1 This is a perspective view schematically illustrating the configuration of a battery pack according to an embodiment of the present invention;

[0017] Figure 2 This is a perspective view schematically illustrating a battery cell according to an embodiment of the present invention;

[0018] Figure 3 It is a schematic example along Figure 2 The line AA in the middle is intercepted Figure 2 A cross-sectional view of the configuration of a single battery cell;

[0019] Figure 4 This is a perspective view schematically illustrating a battery pack including connecting members according to an embodiment of the present invention;

[0020] Figure 5This is a perspective view schematically illustrating a battery pack including connecting members according to an embodiment of the present invention;

[0021] Figure 6 This is a schematic top view illustrating a connecting member according to an embodiment of the present invention;

[0022] Figure 7 It is along the embodiment of the present invention Figure 4 A cross-sectional view of line B-B' in the diagram;

[0023] Figure 8 It is along the embodiment of the present invention Figure 4 A cross-sectional view of line B-B' in the diagram;

[0024] Figure 9 This is a view used to describe the connecting member according to an embodiment of the present invention;

[0025] Figure 10 This is a view used to describe the connecting member according to an embodiment of the present invention;

[0026] Figure 11 This is a view used to describe the connecting member according to an embodiment of the present invention; and

[0027] Figure 12 This is a perspective view schematically illustrating a battery pack according to an embodiment of the present invention. Detailed Implementation

[0028] In this document, some exemplary embodiments of the invention will be described in more detail with reference to the accompanying drawings. The terms or words used in this specification and claims should not be construed as limited to their ordinary or dictionary meanings, and should be interpreted as having meanings and concepts consistent with the technical spirit of the invention, 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 invention. Accordingly, it should be understood that the embodiments described herein and the configurations illustrated in the drawings are merely some of the embodiments of the invention and do not necessarily represent all the technical spirit of the invention; various equivalents and modifications may exist at the time of filing this application.

[0029] Furthermore, when used herein, the terms “comprising” and / or “including” specify the presence of the mentioned shapes, numbers, steps, operations, components, elements and / or groups thereof, and are not intended to exclude the presence or addition of one or more other shapes, numbers, steps, operations, components, elements and / or groups thereof.

[0030] Furthermore, for the purpose of understanding the present invention, the drawings may not be drawn to scale, and the dimensions of some parts may be exaggerated. Additionally, the same reference numerals may be assigned to the same parts in different embodiments.

[0031] The statement that two compared objects are "equal" can mean identical or substantially identical. Identical or substantially identical can include deviations considered low in the art, such as deviations of less than 5%. Additionally, consistency of parameters over a given region can mean consistency from an average perspective.

[0032] Although terms such as "first," "second," etc., may be used to describe various components, these components are not limited by these terms. These terms are used 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.

[0033] Throughout this specification, unless otherwise specifically stated, each element may be singular or plural.

[0034] When any configuration is placed "on (or below)" or "above (or below)" a component, this can mean not only that the configuration is placed in contact with the top (or bottom) of the component, but also that other configurations can be located between the component and any configuration placed on (or below) the component.

[0035] Additionally, when a component is described as being “on”, “connected to”, or “linked to” another component, the components may be directly connected or linked to each other, but it should be understood that other components may be “between” these components, or these components may be “connected,” “linked,” or “linked” through another component.

[0036] As used herein, the term “and / or” includes any one and all combinations of one or more of the related listed items. Furthermore, in describing embodiments of the invention, the use of “may” refers to “one or more embodiments of the invention.” Expressions such as “one or more of…” and “at least one of…” following the list of elements modify the entire list of elements, not individual elements within the list.

[0037] Throughout this specification, unless otherwise stated, “A and / or B” means A, B, or A and B. That is, “and / or” includes any one or all of the listed items. When “C~D” is stated, unless otherwise specifically stated, it means C and below D.

[0038] When phrases such as “at least one of A, B and C”, “at least one of A, B or C”, “at least one selected from the group of A, B and C” or “at least one selected from A, B and C” are used to indicate a list of elements A, B and C, the phrase can refer to any one and all suitable combinations.

[0039] 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 approximate terms and not as 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.

[0040] It should be understood that although the terms "first," "second," and "third," etc., may be used herein to describe various elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or segment from another element, component, region, layer, or segment. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment.

[0041] For ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “up,” etc., may be used herein to describe the relationship of an element or feature to other elements or features illustrated in the accompanying drawings. It should be understood that spatial relative terms are intended to cover different orientations of the device in use or operation other than those depicted in the accompanying drawings. For example, when an element or feature in the accompanying drawings is inverted, an element described as “below” or “under” becomes “up” or “above.”

[0042] The terminology used in this specification is intended to describe embodiments of the invention and is not intended to limit the invention.

[0043] Figure 1 This is a perspective view schematically illustrating the configuration of a battery pack according to an embodiment of the present invention.

[0044] According to an embodiment of the present invention, a battery pack 1000 includes a housing 1100 and a battery cell 100.

[0045] The housing 1100 forms the general appearance of the battery pack and can provide space therein to accommodate the individual battery cells 100.

[0046] The housing 1100 may include a housing body 1110 and a cover 1120.

[0047] The outer casing 1110 can be formed in the shape of a box, having a hollow interior and open sides. The cross-sectional shape of the outer casing 1110 is not limited to... Figure 1 The rectangular shape shown in the example can be any shape, such as other polygonal shapes, circular shapes, elliptical shapes, etc.

[0048] The cover 1120 can be attached to the housing body 1110 and enclose the internal space of the housing body 1110. As an example, the cover 1120 can be formed to have a generally plate shape and can be positioned as an open side facing the housing body 1110. The cover 1120 can be secured to the housing body 1110 by any of various types of connection methods such as bolting, welding, mating, etc.

[0049] The battery cell 100 can be used as a unit structure in a battery pack for storing and supplying electricity.

[0050] Multiple battery cells 100 can be provided. The multiple battery cells 100 can be arranged inside the housing 1100 to form any pattern of various designs, such as a grid shape, a zigzag shape, etc. The multiple battery cells 100 can be arranged parallel to each other. The number of battery cells 100 can vary in various ways depending on the size, shape, etc. of the housing 1100. The configuration of the battery cells will be described below.

[0051] In this document, a battery cell 100 according to an embodiment of the present invention will be described.

[0052] Figure 2 This is a perspective view schematically illustrating a battery cell according to an embodiment of the present invention.

[0053] Figure 3 It is a schematic example along Figure 2 The line AA in the middle is intercepted Figure 2 A cross-sectional view of the configuration of a single battery cell.

[0054] exist Figure 2 and Figure 3 In the figures, reference numeral 100 denotes a battery cell according to an embodiment of the present invention.

[0055] refer to Figure 2 and Figure 3 According to the embodiment, the battery cell 100 (including, for example) Figure 1 The battery cell 100 includes an electrode assembly 10 and a housing 20 for receiving the electrode assembly 10. The battery cell 100 further includes rivets or terminals 30 inserted into a hole 20h formed in one side of the housing 20 and electrically connected to the electrode assembly 10, and a cover plate 60 covering an opening formed in the other side of the housing 20. However, the components of the battery cell 100 are not limited to... Figure 2 and Figure 3 The components illustrated herein, and the battery cell 100 may include only Figure 2 and Figure 3 Some of the components illustrated, and / or others Figure 2 and Figure 3 In addition to the components illustrated herein, other components may be further included.

[0056] In this document, an example of a cylindrical lithium-ion secondary battery will be described for the battery cell 100. However, the invention is not limited thereto, and the battery cell may be, for example, a lithium polymer battery or a prismatic battery.

[0057] The electrode assembly 10 can be used as a unit structure to perform charging and discharging operations in the battery cell 100.

[0058] Electrode assembly 10 includes a first electrode and a second electrode. The first electrode is either a positive or negative electrode. The second electrode is either a negative or positive electrode and has a polarity different from that of the first electrode. In this document, an example is described where the first electrode is a positive electrode and the second electrode is a negative electrode.

[0059] Additionally, the electrode assembly 10 may further include a diaphragm between the first electrode and the second electrode. The diaphragm can prevent or substantially prevent the first electrode and the second electrode from contacting each other, and can prevent or substantially prevent a short circuit between the first electrode and the second electrode. Accordingly, the electrode assembly 10 can be formed by stacking the first electrode, the second electrode, and the diaphragm provided between the first electrode and the second electrode.

[0060] In one embodiment, for example, the electrode assembly 10 is formed into a cylindrical shape, and the stacked structure including a first electrode, a second electrode, and a diaphragm can be wound to form an electrode core. For example, the electrode assembly 10 can have a shape wound clockwise or counterclockwise around a winding axis. In addition to a circular shape, the cross-sectional shape of the electrode assembly 10 can be designed to have any shape of various shapes, such as an elliptical shape, a polygonal shape, etc. Herein, the winding axis can refer to a straight line passing through the center of the electrode assembly 10.

[0061] A more detailed description of each component of the electrode assembly 10 is as follows. Positive electrode active material

[0062] As the positive electrode active material, compounds capable of reversibly inserting and deintercalating lithium (lithiation intercalation compounds) can be used. In one embodiment, at least one of the composite oxides of lithium and a metal selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0063] The composite oxide can be a lithium transition metal composite oxide, and examples of it can include lithium nickel-based oxides, lithium cobalt-based oxides, lithium manganese-based oxides, lithium iron phosphate-based compounds, cobalt-free nickel manganese-based oxides, or combinations thereof.

[0064] For example, a compound represented by any of the following chemical formulas can be used: Li a A 1-b X b O 2-c Dc (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.05);Li a Mn 2-b X b The 4-c D c (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.05);Li a Ni 1-b-c Co b X c The 2-α D α (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.5,0<α<2);Li a Ni 1-b- c Mn b X c The 2-α D α (0.90≤a≤1.8,0≤b≤0.5,0≤c≤0.5,0<α<2);Li a Ni b Co c L 1 d G e O2(0.90≤a≤1.8,0≤b≤0.9,0≤c≤0.5,0≤d≤0.5,0≤e≤0.1);Li a NiG b O2(0.90≤a≤1.8,0.001≤b≤0.1);Li a CoG b O2(0.90≤a≤1.8,0.001≤b≤0.1);Li a Mn 1-b G b O2(0.90≤a≤1.8,0.001≤b≤0.1);Li a Mn2G b O4(0.90≤a≤1.8,0.001≤b≤0.1);Li a Mn 1-g G g PO4(0.90≤a≤1.8,0≤g≤0.5);Li (3-f) Fe2(PO4)3(0≤f≤2); and Li a FePO4 (0.90≤a≤1.8).

[0065] In the above chemical formulas, A is Ni, Co, Mn, or a combination thereof; X is Al, Ni, Co, Mn, Cr, Fe, Mg, Sr, V, rare earth elements, or a combination thereof; D is O, F, S, P, or a combination thereof; G is Al, Cr, Mn, Fe, Mg, La, Ce, Sr, V, or a combination thereof; and L 1 It is Mn, Al, or a combination thereof.

[0066] As an example, the positive electrode active material can be a high-nickel-based positive electrode active material having a nickel content of 80 mol% or more, 85 mol% or more, 90 mol% or more, 91 mol% or more, or 94 mol% and 99 mol% based on 100 mol% of metals other than lithium in a lithium transition metal composite oxide. High-nickel-based positive electrode active materials can achieve high capacity and therefore can be used in high-capacity and high-density lithium batteries. positive electrode

[0067] The positive electrode for the battery cell 100 may include a current collector and a positive electrode active material layer formed on the current collector. The positive electrode active material layer may include a positive electrode active material and may further include a binder and / or a conductive material.

[0068] As an example, the positive electrode may further include additives that can be used as a sacrificial positive electrode.

[0069] In one embodiment, based on a 100 wt% positive electrode active material layer, the content of the positive electrode active material can be 90 wt% to 99.5 wt%, and based on a 100 wt% positive electrode active material layer, the content of each of the binder and the conductive material can be 0.5 wt% to 5 wt%.

[0070] The binder can effectively adhere the particles constituting the positive electrode active material to each other, and also effectively adhere the positive electrode active material to the current collector. Representative examples of binders may include, but are not limited to, polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, polymers containing ethylene oxide, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, nylon, etc.

[0071] The conductive material imparts conductivity to the electrode, and any suitable material that does not cause chemical changes and is conductive can be used. Examples of the conductive material may include: carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fiber, carbon nanofiber or 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.

[0072] In one embodiment, Al can be used as the current collector, but the present invention is not limited thereto. Negative electrode active material

[0073] The negative electrode active material may include a material capable of reversibly intercalating and deintercalating lithium ions, lithium metal, an alloy of lithium and a metal, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0074] The material capable of reversibly intercalating / deintercalating lithium ions may be a carbon-based negative electrode active material, for example, crystalline carbon, amorphous carbon or a combination thereof. Examples of crystalline carbon may include graphite such as amorphous, plate-shaped, flaky, spherical or fibrous natural graphite or artificial graphite, and examples of amorphous carbon may include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, etc.

[0075] In one embodiment, 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 the alloy of lithium and a metal.

[0076] A Si-based negative electrode active material or a Sn-based negative electrode active material can be used as the material capable of doping and dedoping lithium. The Si-based negative electrode active material may 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 may be Sn, SnO2, a Sn-based alloy or a combination thereof.

[0077] The silicon-carbon composite may be a composite material of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite may be in the form of silicon particles coated with amorphous carbon on the surface. For example, the silicon-carbon composite may include secondary particles (cores) in which silicon primary particles are aggregated and an amorphous carbon coating (shell) located on the surface of the secondary particles. Amorphous carbon may also be located between the silicon primary particles, and for example, the silicon primary particles may be coated with amorphous carbon. The secondary particles may be dispersed in an amorphous carbon matrix.

[0078] The silicon-carbon composite may further include crystalline carbon. For example, the silicon-carbon composite may include a core comprising crystalline carbon and silicon particles, and an amorphous carbon coating on the surface of the core.

[0079] Si-based or Sn-based negative electrode active materials can be used in combination with carbon-based negative electrode active materials. negative electrode

[0080] The negative electrode for the battery cell 100 may include a current collector and a negative electrode active material layer located on the current collector. The negative electrode active material layer may include a negative electrode active material and may further include a binder and / or a conductive material.

[0081] In one embodiment, for example, the negative electrode active material layer may include 90 wt% to 99 wt% of negative electrode active material, 0.5 wt% to 5 wt% of binder, and 0 wt% to 5 wt% of conductive material.

[0082] The binder can effectively adhere the particles constituting the negative electrode active material to each other, and also effectively adhere the negative electrode active material to the current collector. The binder can include non-aqueous binders, aqueous binders, dry binders, or combinations thereof.

[0083] 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.

[0084] Waterborne adhesives can 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.

[0085] If an aqueous binder is used as the negative electrode binder, it may further include a cellulose-based compound capable of imparting viscosity. This cellulose-based compound can be used by mixing one or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts. In one embodiment, Na, K, or Li may be used as the alkali metal.

[0086] Dry adhesives are polymeric materials capable of being fibrous, and can be, for example, polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0087] Conductive materials impart conductivity to electrodes, and any suitable material that does not cause chemical changes and conducts electricity can be used. Examples may include: carbon-based materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, or carbon nanotubes; metal-based materials in the form of metal powders or metal fibers containing copper, nickel, aluminum, silver, etc.; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0088] The negative electrode current collector can be selected from copper foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, polymer substrate coated with conductive metal, and combinations thereof. diaphragm

[0089] Depending on the type of battery cell 100, a separator can be present between the positive and negative electrodes. As the separator, polyethylene, polypropylene, polyvinylidene fluoride, or multilayer membranes of two or more layers thereof can be used, and hybrid multilayer membranes such as polyethylene / polypropylene two-layer membranes, polyethylene / polypropylene / polyethylene three-layer membranes, or polypropylene / polyethylene / polypropylene three-layer membranes can be used.

[0090] The diaphragm may include a porous substrate and a coating comprising organic material, inorganic material or a combination thereof located on one or both or opposite sides of the porous substrate.

[0091] The porous substrate can be a polymer film formed from any polymer selected from polyolefins (such as polyethylene and polypropylene), polyesters (such as polyethylene terephthalate and polybutylene terephthalate), polyacetal, polyamide, polyimide, polycarbonate, polyetherketone, polyaryletherketone, polyetherimide, polyamideimide, polybenzimidazole, polyethersulfone, polyphenylene ether, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, and polytetrafluoroethylene (e.g., Teflon), or copolymers or mixtures of two or more of them.

[0092] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0093] 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.

[0094] Organic and inorganic materials can exist as a mixture in a single coating, or they can exist as a stack of coatings containing organic materials and coatings containing inorganic materials.

[0095] The housing 20 houses the electrode assembly 10. The housing 20 can seal the housed electrode assembly 10 together with the electrolyte. electrolyte

[0096] The electrolyte used in the battery cell 100 includes a non-aqueous organic solvent and a lithium salt.

[0097] Non-aqueous organic solvents are used as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0098] Non-aqueous organic solvents can be carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, or combinations thereof.

[0099] Examples of carbonate solvents may include dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), methyl ethyl carbonate (MEC), ethylene carbonate (EC), propylene carbonate (PC), butyl carbonate (BC), etc.

[0100] Ester solvents may include any one of methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanoic acid lactone, mevalonate lactone, caprolactone, etc.

[0101] Ether solvents can include dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ester, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, and tetrahydrofuran. Additionally, cyclohexanone and the like can be used as ketone solvents. As alcohol solvents, ethanol, isopropanol, etc., can be used. And as aprotic solvents, nitriles such as R-CN (where R is a straight-chain, branched, or cyclic hydrocarbon group having 2 to 20 carbon atoms, and may include double bonds, aromatic rings, or ether groups), amides such as dimethylformamide, dioxolane such as 1,3-dioxolane or 1,4-dioxolane, sulfolane, etc., can be used.

[0102] Non-aqueous organic solvents can be used alone or in mixtures of two or more.

[0103] In one embodiment, if a carbonate solvent is used, cyclic carbonates and chain carbonates can be mixed and used, and the cyclic carbonates and chain carbonates can be mixed in a volume ratio of 1:1 to 1:9.

[0104] Lithium salts are substances that can dissolve in organic solvents and serve as a source of lithium ions within batteries, enabling basic operation and facilitating the movement of lithium ions between the positive and negative electrodes. Representative examples of lithium salts can include those from LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiAlO2, LiAlCl4, LiPO2F2, LiCl, LiI, LiN(SO3C2F5)2, Li(FSO2)2N (lithium bis(fluorosulfonyl)imide (LiFSI)), LiC4F9SO3, and LiN(C x F 2x+1 SO2)(C y F 2y+1 One or more of the following: (SO2) (x and y are integers from 1 to 20), lithium trifluoromethanesulfonate, lithium tetrafluoroethanesulfonate, lithium difluorobis(oxalate)phosphate (LiDFOP), and lithium bis(oxalate)borate (LiBOB).

[0105] The housing 20 is sealed after containing the electrode assembly 10 and the electrolyte. For example, the housing 20 may be sealed by a cover plate 60.

[0106] The housing 20 forms the general appearance of the battery cell 100. In one embodiment, the housing 20 includes an upper surface forming a circular upper portion and a side surface connected to the outer side of the upper surface and extending perpendicularly from the upper surface to form a side portion.

[0107] The housing 20 may have a hole 20h formed in its upper surface. The hole 20h is formed to pass through the upper surface of the housing 20. The hole 20h may be located at the central portion of the upper surface of the housing 20. The hole 20h may be formed above, for example, the winding center of the electrode assembly 10. In one embodiment, the shape of the hole 20h may correspond to the shape of the rivet 30. For example, if the cross-section of the rivet 30 is circular, the cross-section of the hole 20h may be formed to be circular. In one embodiment, the diameter of the cross-section of the hole 20h is larger than the diameter of a portion of the cross-section of the rivet 30.

[0108] In this configuration, housing 20 may have an open cylindrical lower portion. The interior of housing 20 can be sealed by sealing the opening with cover plate 60. Accordingly, housing 20 can prevent or substantially prevent electrolyte leakage to the outside and protect electrode assembly 10.

[0109] In one embodiment, the housing 20 may be made of, for example, steel, stainless steel, aluminum, aluminum alloys, combinations thereof, or equivalents thereof.

[0110] The cover plate 60 seals the housing 20 while covering the opening of the housing 20.

[0111] The battery cell 100 may further include a gasket 80 to further ensure that the housing 20 is sealed. The gasket 80 may be formed, for example, in an annular shape. The gasket 80 may be located between the cover plate 60 and the inner surface of the housing 20, while surrounding the outer surface of the cover plate 60. The gasket 80 may include, for example, a polymer. Accordingly, the gasket 80 may prevent or substantially prevent the electrolyte inside the battery cell 100 from leaking to the outside, or prevent or substantially prevent safety issues from occurring.

[0112] A coiled portion 21 may be formed in the housing 20 to fix the cover plate 60 to the opening of the housing 20. In one embodiment, for example, the coiled portion 21 is formed on the underside of the housing 20. The coiled portion 21 is formed by recessing the housing 20 inward. The coiled portion 21 prevents or substantially prevents the cover plate 60 from further entering the housing 20 from the opening of the housing 20 due to the recess. In one embodiment, a crimped portion 22 may be further formed in the housing 20 to fix the cover plate 60 to the opening of the housing 20. The crimped portion 22 may be formed by curling the end of the opening of the housing 20 toward the interior of the housing 20. For example, the crimped portion 22 may be formed by bending toward the interior of the housing 20 after the cover plate 60 is provided in the opening of the housing 20. Accordingly, the cover plate 60 may cover the opening of the housing 20.

[0113] The cover plate 60 can also serve as an exhaust port (e.g., simultaneously). In one embodiment, for example, the cover plate 60 may include a groove 61. The groove 61 can rupture when the pressure inside the housing 20 increases or the temperature rises. The groove 61 can rupture to release gases generated inside the housing 20 to the outside.

[0114] In one embodiment, the housing 20 is electrically connected to an electrode assembly 10 housed within the housing 20. For example, the housing 20 may be electrically connected to a second electrode. The second electrode may be, for example, a negative electrode.

[0115] The battery cell 100 may further include a second current collector 70 located at the lower portion of the electrode assembly 10 for electrically connecting the housing 20 and the second electrode. For example, the second current collector 70 may be located between the lower portion of the electrode assembly 10 and the upper portion of the cover plate 60.

[0116] In one embodiment, the second current collector 70 and the cover plate 60 may be insulated from each other by a gasket 80. The second current collector 70 may be, for example, a negative electrode current collector. The second current collector 70 is connected to the second electrode and collects current. In one embodiment, for example, the second current collector 70 is connected to a terminal block of the second electrode, and the second current collector 70 is coupled to the housing 20. Accordingly, the housing 20 may be electrically connected to the second electrode and have the same polarity as the second electrode. That is, for example, the housing 20 may have a negative polarity.

[0117] Rivet 30 is inserted into a hole 20h formed in the upper surface of housing 20. Rivet 30 is inserted into hole 20h and is electrically connected to electrode assembly 10 housed in housing 20. For example, rivet 30 is electrically connected to a first electrode. The first electrode may be, for example, a positive electrode.

[0118] The battery cell 100 may further include a first current collector plate 40 located at the upper portion of the electrode assembly 10 for electrically connecting the rivet 30 and the first electrode. The first current collector plate 40 is, for example, a positive electrode current collector plate. The first current collector plate 40 is connected to the first electrode and collects current. For example, the first current collector plate 40 is connected to a terminal block of the first electrode. Additionally, the first current collector plate 40 is connected to the rivet 30. Accordingly, the rivet 30 may be electrically connected to the first electrode and have the same polarity as the first electrode. That is, for example, the rivet 30 may have a positive polarity.

[0119] The rivet 30 may include a conductive material for electrical connection with the first electrode. In one embodiment, for example, the rivet 30 includes metal. In one embodiment, for example, the rivet 30 includes aluminum (Al).

[0120] As described above, rivet 30 is connected to the first electrode. Additionally, housing 20 is electrically connected to the second electrode. That is, housing 20 and rivet 30 have different polarities. In this case, if housing 20 and rivet 30 come into contact, a short circuit will occur between them.

[0121] To avoid this, the battery cell 100 may further include an insulator 50 that insulates between the housing 20 and the rivet 30.

[0122] The insulator 50 is located below the rivet 30. Additionally, the insulator 50 is located on the upper side of the housing 20. The insulator 50 comprises insulating material. The insulator 50 is located between the housing 20 and the rivet 30, and provides insulation between them. Accordingly, the insulator 50 prevents or substantially prevents short circuits between the housing 20 and the rivet 30.

[0123] The battery cell 100 may further include an insulating layer 90. The insulating layer 90 may be provided on the first current collector 40. The insulating layer 90 prevents or substantially prevents electrical connection between the first current collector 40 and the housing 20.

[0124] With this configuration, the battery cell 100 according to an embodiment of the invention can provide a battery with increased capacity by eliminating the rolled portion from its upper part. Additionally, the battery cell 100 can avoid potential safety or cost problems should the cover 60 be positioned at its lower part.

[0125] Figure 4 This is a perspective view schematically illustrating a battery pack including connecting members according to an embodiment of the present invention.

[0126] Figure 5 This is a perspective view schematically illustrating a battery pack including connecting members according to an embodiment of the present invention.

[0127] The battery pack 1000 according to an embodiment of the present invention includes, for example, Figure 1 The battery pack shown in the diagram includes multiple battery cells 100 (including, for example, Figures 1 to 3 The battery cell shown in the diagram) and the connecting member 200 electrically connecting at least some of the battery cells 100. Figure 1 As shown, the battery pack 1000 may further include a housing 1100 that accommodates a plurality of battery cells 100.

[0128] like Figure 1 As shown, the battery pack 1000 includes a plurality of battery cells 100. (As illustrated...) Figure 2 and Figure 3 As shown, the battery cell 100 may include, for example, a cylindrical battery.

[0129] Each of the plurality of battery cells 100 includes a first terminal and a second terminal. The first terminal is electrically connected to a first electrode. For example, the first electrode may be a positive electrode, and the first terminal may be a positive electrode terminal. For example, the positive electrode terminal may be a rivet 30. The second terminal is electrically connected to a second electrode. For example, the second electrode may be a negative electrode, and the second terminal may be a negative electrode terminal. For example, the negative electrode terminal may be a housing 20.

[0130] In one embodiment, for example, as Figure 4 As shown, the plurality of battery cells 100 can be arranged in a zigzag shape. In one embodiment, for example, the plurality of battery cells 100 can be arranged to form a face-centered cubic structure or a body-centered cubic structure.

[0131] In one embodiment, for example, as Figure 5 As shown, multiple battery cells 100 can be arranged in one or more rows. In one embodiment, for example, multiple battery cells 100 can be arranged to form a simple cubic structure.

[0132] For example, the plurality of battery cells 100 may include a first battery cell 100a and a second battery cell 100b. For example, the first battery cell 100a and the second battery cell 100b may be arranged adjacent to each other.

[0133] The connecting member 200 electrically connects two or more of the plurality of battery cells 100. The connecting member 200 may include any component electrically connected to two or more of the plurality of battery cells 100 or electrically connected to one or more of the plurality of battery cells 100. For example, the connecting member 200 may include a busbar, a terminal block, or a protection circuit module (e.g., including a battery management system (BMS), a protection circuit module (PCM), etc.).

[0134] The connecting member 200 can be connected to a terminal of the battery cell 100. For example, the connecting member 200 can be connected to a first terminal. Furthermore, for example, the connecting member 200 can be connected to a second terminal. In one embodiment, for example, the connecting member 200 can be connected to the terminal of the battery cell 100 by soldering.

[0135] For example, the connecting member 200 can electrically connect the first battery cell 100a and the second battery cell 100b. For example, the connecting member 200 is connected to the first terminal of the first battery cell 100a. In addition, for example, the connecting member 200 is connected to the second terminal of the second battery cell 100b.

[0136] For example, the connecting member 200 can be connected to a first terminal and a second terminal. Accordingly, the connecting member 200 can electrically connect two battery cells 100 positioned adjacent to each other.

[0137] In one embodiment, for example, as Figure 4 and Figure 5 As shown, the connecting member 200 can be connected to a plurality of first terminals and a plurality of second terminals. Accordingly, the connecting member can electrically connect three or more battery cells 100.

[0138] For example, such as Figure 4 As shown, multiple battery cells 100 can be arranged in a zigzag shape, and the connecting member 200 can be formed in a zigzag shape corresponding to the arrangement of the battery cells 100, so as to be electrically connected to the battery cells 100.

[0139] In one embodiment, for example, as Figure 5 As shown, multiple battery cells 100 can be arranged in a parallel manner in the form of m rows × n columns (where m is a natural number greater than or equal to 1, and n is a natural number greater than or equal to 1). In this case, columns represent battery cells arranged in the front-to-back direction, and rows represent battery cells arranged in the left-to-right direction. For example, Figure 5 An example is shown where multiple battery cells 100 are arranged in 2 rows × 2 columns. The connecting member 200 may be formed in a parallel shape corresponding to the arrangement of the battery cells 100 for electrical connection to the battery cells 100.

[0140] In one embodiment, the conventional connecting member comprises a single material. In one embodiment, for example, the connecting member 200 may comprise only aluminum (Al) or only copper (Cu).

[0141] However, in one embodiment, the first terminal and the second terminal comprise different materials. In one embodiment, for example, the first terminal comprises aluminum (Al), and the second terminal comprises copper (Cu).

[0142] Accordingly, conventional connecting members may be joined to at least one of the first and second terminals with low bonding strength. For example, if the connecting member comprises aluminum (Al), voids, cracks, or intermetallic compounds (IMCs) may form between the connecting member 200 and the second terminal. In this case, the connecting member and the second terminal may have reduced bonding strength. Furthermore, for example, if the connecting member comprises copper (Cu), voids, cracks, or intermetallic compounds (IMCs) may form between the connecting member 200 and the first terminal. In this case, the connecting member and the second terminal may have reduced bonding strength.

[0143] Therefore, if the bonding strength between the connecting member and the battery cell 100 is insufficient, the electrical connection between the connecting member and the battery cell 100 may become weak. The battery pack 1000 may not receive enough electrical energy from the battery cell 100, or safety issues may arise during charging and discharging. Therefore, the connecting member 200 needs to be securely fixed to the battery cell 100.

[0144] The connecting member 200 according to an embodiment of the present invention provides a structure that avoids the above-mentioned problems. For example, the connecting member 200 can be formed by combining two or more members, rather than by forming a single member.

[0145] The connecting member 200 is described in more detail in this document.

[0146] Figure 6 This is a schematic top view illustrating a connecting member according to an embodiment of the present invention.

[0147] The connecting member 200 according to an embodiment of the present invention (including, for example) Figure 4 and Figure 5 The connecting components shown include a first component 210 and a second component 220.

[0148] like Figure 4 and Figure 5 As shown, the connecting member 200 is electrically connected to the battery cell 100. Additionally, the connecting member 200 is electrically connected to two or more battery cells 100.

[0149] The first component 210 is connected to the first terminal of the battery cell 100. For example, the first component 210 is connected to the rivet 30 of the battery cell 100. The second component 220 is connected to the second terminal of the battery cell 100. For example, the second component 220 is connected to the housing 20 of the battery cell 100.

[0150] In this case, the battery cell 100 to which the first terminal to which the first component 210 is connected and the battery cell 100 to which the second terminal to which the second component 220 is connected are different battery cells. For example, the battery cells to which the first component 210 is connected and the battery cells to which the second component 220 is connected can be positioned adjacent to each other.

[0151] The first component 210 and the second component 220 are connected to each other.

[0152] In one embodiment, the first member 210 includes a first engagement portion 211 engaged with a first terminal and an insertion channel 212 connected to the second member 220.

[0153] The first joining portion 211 is connected to the first terminal. In one embodiment, for example, the first joining portion 211 can be joined to the first terminal by welding. Welding can include, for example, ultrasonic welding, laser welding, pulse welding, and other suitable methods for joining two or more metals.

[0154] The first engaging portion 211 can be shaped for easy connection to the first terminal. For example, the first terminal may include a rivet 30 having a circular shape, such as... Figure 2 and Figure 3 As shown in the figure. In one embodiment, the first engagement portion 211 may be formed as a circular plate shape corresponding to the upper shape of the rivet 30.

[0155] Insertion channel 212 extends from first engagement portion 211 toward second member 220. Insertion channel 212 allows first engagement portion 211 and second member 220 to connect, and insertion channel 212 has a channel formed therein.

[0156] The channel formed inside the insertion channel 212 can be formed from a first side of the first member 210 toward its second side. In this case, the first side of the first member 210 is the side adjacent to the second member 220, and the second side of the first member 210 is the side where the first engagement portion 211 is located.

[0157] Insertion channel 212 is connected to second member 220. For example, insertion channel 212 may have a channel formed therein that allows second member 220 to be inserted, thereby connecting to second member 200. In this case, the channel may be formed to have a size greater than or equal to that of second member 220. The channel may be formed to correspond to the shape of second member 220.

[0158] For example, the second member 220 includes a second engagement portion 221 connected to the second terminal and an insertion portion 222 connected to the first member 210.

[0159] The second joining portion 221 is connected to the second terminal. For example, the second joining portion 221 can be joined to the second terminal by welding. Welding can include, for example, ultrasonic welding, laser welding, pulse welding, and other suitable methods for joining two or more metals.

[0160] The second engagement portion 221 can be shaped for easy connection to the second terminal. For example, the second terminal may include the housing 20 of the battery cell 100. In one embodiment, the second engagement portion 221 can be shaped to correspond to the housing 20. For example, the second engagement portion 221 can be shaped to correspond to the upper surface of the housing 20, such as... Figure 6 As shown. For example, the second engagement portion 221 may be formed in a shape corresponding to the area on the upper surface of the housing 20 other than the rivet 30. In one embodiment, for example, the second engagement portion 221 may be formed in a fan shape with a 180° angle, excluding the central portion (e.g., the location of the rivet 30).

[0161] The insertion portion 222 extends from the second engagement portion 221 toward the first member 210. The insertion portion 222 allows the second engagement portion 221 and the first member 210 to connect. The insertion portion 222 is inserted into a channel formed in the insertion channel 212 of the first member 210.

[0162] In one embodiment, the cross-section of the region where the insertion portion 222 is inserted forms a sandwich structure consisting of the insertion channel 212, the insertion portion 222, and the insertion channel 212. Therefore, the connecting member 200 can be formed into a single structure by connecting two members to each other.

[0163] In this manner, the connecting member 200 includes a first member 210 connected to a first terminal and a second member 220 connected to a second terminal. In one embodiment, the first member 210 is formed corresponding to the first terminal. In one embodiment, for example, the first member 210 includes a material corresponding to the first terminal, or is formed in a shape corresponding to the first terminal. Similarly, the second member 220 is formed corresponding to the second terminal. In one embodiment, for example, the second member 220 includes a material corresponding to the second terminal, or is formed in a shape corresponding to the second terminal.

[0164] In one embodiment, for example, the first terminal and the second terminal may comprise different materials. In this case, the first component 210 and the second component 220 may comprise different materials.

[0165] In one embodiment, for example, the first component 210 includes a first material, and the second component 220 includes a second material. In this case, the first material and the second material may be different.

[0166] For example, the first component 210 may include a first material to improve the welding reliability with the first terminal of the first battery cell 100a.

[0167] The first material includes a material that is readily electrically connected to a first terminal of the first battery cell 100a. For example, the first material includes a conductive material. The conductive material includes, for example, a metal.

[0168] In one embodiment, for example, the first material includes a material that is easy to solder to the first terminal of the first battery cell 100a.

[0169] In one embodiment, for example, the first component 210 may include the same material as the first terminal of the first battery cell 100a. In one embodiment, for example, the first terminal of the first battery cell 100a includes aluminum (Al), and the first component 210 includes at least one of aluminum (Al), aluminum alloys, and combinations thereof.

[0170] In one embodiment, for example, the first component 210 may include a material different from the material included in the first terminal of the first battery cell 100a but which can be easily soldered to the material included in the first terminal of the first battery cell 100a. In one embodiment, for example, the first terminal of the first battery cell 100a includes aluminum (Al), and the first component 210 may include nickel (Ni), copper (Cu), tungsten (W), silver (Ag), gold (Au), or an alloy including at least one of these.

[0171] Therefore, the first material included in the first component 210 can be determined based on the material included in the first terminal of the first battery cell 100a.

[0172] For example, the second component 220 may include a second material to improve the welding reliability with the second terminal of the second battery cell 100b.

[0173] The second material includes a material that can be readily electrically connected to the second terminal of the second battery cell 100b. For example, the second material includes a conductive material. This conductive material includes, for example, a metal.

[0174] For example, the second material includes a material that is easy to weld to the second terminal of the second battery cell 100b.

[0175] In one embodiment, for example, the second component 220 may include the same material as the second terminal of the second battery cell 100b. In one embodiment, for example, the second terminal of the second battery cell 100b includes at least one of iron (Fe), steel (e.g., stainless steel (SUS) or steel plate cold deep drawing extra (SPCE)), and alloys thereof. In one embodiment, for example, the second material includes at least one of iron (Fe), copper (Cu), nickel (Ni), tungsten (W), silver (Ag), gold (Au), titanium (Ti), alloys thereof, and combinations thereof.

[0176] Therefore, the second material included in the second component 220 can be determined based on the material included in the second terminal of the second battery cell 100b.

[0177] The connecting member 200 according to an embodiment of the present invention is formed by connecting a first member 210 and a second member 220, and therefore can be engaged with a first terminal and a second terminal formed of different materials and / or shapes with high engagement reliability. If the materials included in the objects joined by the first member 210 and the second member 220 are the same, then the first material and the second material can naturally be the same.

[0178] In addition, the connecting member 200 can ensure structural strength in the height direction by forming a sandwich structure between the first member 210 and the second member 220 instead of a single-layer joint.

[0179] In addition, the battery pack 1000 according to one or more embodiments of the present invention can improve safety and / or charging / discharging efficiency by electrically connecting two or more of the plurality of battery cells 100 by the connecting member 200.

[0180] Figure 7 It is according to the embodiment along Figure 4 A cross-sectional view of line B-B' in the diagram.

[0181] Figure 8 It is according to the embodiment along Figure 4A cross-sectional view of line B-B' in the diagram.

[0182] The connecting member 200 according to an embodiment of the present invention (including, for example) Figures 4 to 6 The connecting member shown includes a first member 210 and a second member 220. The first member 210 is provided with an insertion channel formed on one side, and the second member 220 is provided with an insertion portion formed on one side and is connected to the first member 210 when the insertion portion is inserted into the insertion channel.

[0183] Additionally, the battery pack 1000 according to an embodiment of the present invention (including, for example) Figure 1 , Figure 4 and Figure 5 The battery pack shown in the diagram includes multiple battery cells 100 (including, for example, Figures 1 to 5 (The battery cell shown in the figure) and connecting member 200.

[0184] exist Figure 7 and Figure 8 The shape of the connecting member 200 and the connection pattern between the first member 210 and the second member 220 are shown in the figure. For ease of description, the case in which the connecting member 200 is electrically connected to a plurality of battery cells 100 including the first battery cell 100a and the second battery cell 100b will be described as an example.

[0185] The first battery cell 100a includes a first terminal and a second terminal. For example, the first battery cell 100a includes a rivet 30a and a housing 20a. The second battery cell 100b also includes a first terminal and a second terminal. For example, the second battery cell 100b includes a rivet 30b and a housing 20b.

[0186] The first battery cell 100a and the second battery cell 100b can be positioned adjacent to each other. For example, the connecting member 200 can electrically connect the first terminal of the first battery cell 100a and the second terminal of the second battery cell 100b.

[0187] The first component 210 is engaged with a rivet 30a of the first battery cell 100a. For example, the lower portion of the first component 210 is engaged with the upper surface of the first battery cell 100a. In one embodiment, for example, the first component 210 can be engaged with the rivet 30a of the first battery cell 100a by welding.

[0188] The second component 220 is joined to the housing 20b of the second battery cell 100b. For example, the lower portion of the second component 220 is joined to the upper surface of the housing 20b of the second battery cell 100b. In one embodiment, for example, the second component 220 may be joined to the housing 20b of the second battery cell 100b by welding.

[0189] In one embodiment, as described above, the rivet 30 is inserted into a hole formed in the housing 20. Accordingly, the rivet 30 can protrude upward from the upper surface of the housing 20 in the height direction of the battery cell 100. That is, the rivet 30a of the first battery cell 100a and the upper surface of the housing 20b of the second battery cell 100b can be located at different heights.

[0190] Accordingly, the first engagement portion 211 and the second engagement portion 221 can be located at different heights. For example, the first engagement portion 211, which engages with the rivet 30a, can be positioned higher than the second engagement portion 221, which engages with the housing 20b. In order to connect the first engagement portion 211 and the second engagement portion 221 while overcoming the height difference between them, the insertion channel 212 and / or the insertion portion 222 can be formed as curved or bent.

[0191] In one embodiment, for example, as Figure 7 and Figure 8 As shown, the first member 210 may be configured to extend toward the second member 220, and at least a portion thereof may be configured to be bent. In one embodiment, with Figure 7 and Figure 8 As shown, the first member 210 can be formed to extend in a straight line toward the second member 220.

[0192] In one embodiment, for example, as Figure 7 As shown, the second member 220 may be formed to extend toward the first member 210, and at least a portion thereof may be formed to be bent. For example, the insertion portion 222 may be bent to correspond to the height of the insertion channel 212. For example, the insertion portion 222 may first be bent upward from the second engagement portion 221, and then be bent toward the insertion channel 212 at the height where the insertion channel 212 is located.

[0193] Accordingly, the insertion portion 222 can be inserted into the insertion channel 212 to connect the first member 210 and the second member 220. In one embodiment, the insertion portion 222 can be inserted sufficiently deep into the insertion channel 212 by being inserted at the same height as the insertion channel 212. Accordingly, the insertion portion 222 and the insertion channel 212 can be securely connected to each other.

[0194] In one embodiment, for example, as Figure 8 As shown, the second member 220 may be formed to extend toward the first member 210, and at least a portion thereof may be formed to be bent. For example, the insertion portion 222 may be bent upward. In one embodiment, the insertion channel 212 is bent downward and extends toward the insertion portion 222.

[0195] Accordingly, the insertion portion 222 can be inserted into the insertion channel 212 to connect the first member 210 and the second member 220. In one embodiment, the insertion channel 212 extends relatively long toward the insertion portion 222, and the insertion portion 222 can be formed relatively short. As described above, the first member 210 may include a first material, and the second member 220 may include a second material. In one embodiment, the second material typically includes a material that is more expensive than the first material. Accordingly, the insertion portion 222 can be formed relatively short, thereby helping to reduce the material cost of the connecting member 200.

[0196] However, the connection form of the first component 210 and the second component 220 is not limited to... Figure 7 and Figure 8 The example shown is illustrated. The connecting member 200 can have any suitable form in which the first member 210 and the second member 200 are connected by inserting the second member 220 into the first member 210. Furthermore, the connecting member 200 can have a form in which the first member 210 and the second member 200 are connected by inserting the first member 210 into the second member 220. In this document, the case of connecting the first member 210 and the second member 220 by inserting the second member 220 into the first member 210 will be described as an example.

[0197] As described above, the first component 210 and the second component 200 form a sandwich structure by inserting the second component 220 into the first component 210. In one embodiment, the sandwich structure may be in a semi-molten or room temperature molten state. For example, a bonding interface formed in the semi-molten or room temperature molten state is formed between the insertion portion 222 and the insertion channel 212. In this case, the semi-molten bonding includes, for example, hot-press bonding, ultrasonic bonding, encapsulation bonding, etc.

[0198] Accordingly, the first component 210 and the second component 220 can be bonded together in a semi-molten state or in a room temperature molten state to form an excellent bonding interface. For example, even if the first component 210 and the second component 220 contain different dissimilar materials, the first component 210 and the second component 220 can form a high-strength structure with an excellent bonding interface.

[0199] Figure 9 This is a view used to describe the connecting member according to an embodiment of the present invention.

[0200] The connecting member 200 according to an embodiment of the present invention (including, for example) Figures 4 to 8The connecting member shown includes a first member 210 and a second member 220. The first member 210 is provided with an insertion channel 212 formed on one side, and the second member 220 is provided with an insertion portion 222 formed on one side and is connected to the first member 210 when the insertion portion 222 is inserted into the insertion channel 212.

[0201] In one embodiment, for example, the length m of the segment of the insertion portion 222 inserted into the insertion channel 212 is 30% or more and 60% or less of the width of the insertion portion 222. If the length m of the segment to be inserted is less than 30% of the width of the insertion portion 222, it may be difficult to ensure a bonding area for the bonding between the first member 210 and the second member 220. For example, it may be difficult to apply a thermoforming method between the first member 210 and the second member 220. Furthermore, if the length m of the segment to be inserted is greater than 60% of the width of the insertion portion 222, there is a risk of a short circuit when in contact with an adjacent battery cell 100. Accordingly, in one embodiment, the length m of the segment of the insertion portion 222 inserted into the insertion channel 212 is 30% or more and 60% or less of the width of the insertion portion 222.

[0202] In one embodiment, for example, the thickness t1 of the first component 210 and the thickness t2 of the second component 200 can be set by taking into account the current in the battery cell 100, the weight ratio in the battery pack 1000 and / or the cost of the first component 210 and / or the second component 220.

[0203] In one embodiment, for example, the thickness t2 of the second member 220 is formed to be 15% or more and 45% or less of the thickness t1 of the first member 210. In another embodiment, for example, the thickness t2 of the second member 220 is formed to be 20% or more and 40% or less of the thickness t1 of the first member 210. In yet another embodiment, for example, the thickness t2 of the second member 220 is formed to be 20% or more and 35% or less of the thickness t1 of the first member 210. In yet another embodiment, for example, the thickness t2 of the second member 220 is formed to be 25% or more and 40% or less of the thickness t1 of the first member 210. In yet another embodiment, for yet another embodiment, the thickness t1 of the first member 210 may be 1.00 mm, and the thickness of the second member 220 may be 0.33 mm.

[0204] If the thickness t2 of the second component 220 is less than 15% of the thickness t1 of the first component 210, there may be a problem of weak strength in the second component 220. In this case, strength includes peel strength measured, for example, by a peel test. If the thickness t2 of the second component 220 is greater than 45% of the thickness t1 of the first component 210, there may be a problem of weak bonding strength between the first component 210 and the second component 220. Therefore, in one embodiment, the thickness t2 of the second component 220 is formed to be more than 15% and less than 45% of the thickness t1 of the first component 210.

[0205] Figure 10 This is a view used to describe the connecting member according to an embodiment of the present invention.

[0206] The connecting member 200 according to an embodiment of the present invention (including, for example) Figures 4 to 9 The connecting member shown includes a first member 210 having an insertion channel 212 formed on one side and a second member 220 connected to the first member 210.

[0207] The first member 210 includes an insertion channel 212 formed on one side and a first engagement portion 211 formed on the other side and connected to the insertion channel 212. The first engagement portion 211 is the area that engages with the first terminal.

[0208] The first engagement portion 211 engages with the first terminal, thereby connecting the first member 210 and the battery cell 100. In this case, an engagement interface is formed between the first engagement portion 211 and the first terminal. For example, an engagement surface is formed between the first engagement portion 211 and the first terminal.

[0209] exist Figure 10 In the accompanying drawings, reference numeral A1 indicates the area of ​​the first terminal on the plane including the mating surface. For example, A1 indicates the upper region of rivet 30. Figure 10 In the accompanying drawings, reference numeral A2 indicates the region of the first joining portion 211 on the plane including the joining surface. For example, A2 indicates the region of the lower portion of the first joining portion 211.

[0210] For example, at the interface between the first joint portion 211 and the first terminal, the region A1 of the first terminal is greater than or equal to the region A2 of the first joint portion 211. For example, at the interface between the first joint portion 211 and the first terminal, the region A1 of the first terminal may be greater than the region A2 of the first joint portion 211. That is, when viewed from above, the region A2 of the first joint portion 211 may be less than or equal to the region A1 of the first terminal.

[0211] In one embodiment, for example, the first engagement portion 211 can be engaged to the first terminal using a pusher-type jig. In this case, the first engagement portion 211 can be formed to have a size smaller than or equal to that of the first terminal, thereby improving the pressing performance of the jig. That is, the first engagement portion 211 is formed to have a size smaller than or equal to that of the first terminal, thereby improving the adhesion between the first engagement portion 211 and the first terminal and / or improving the engagement quality.

[0212] Therefore, at the interface between the first engagement portion 211 and the first terminal, in one embodiment, the region A1 of the first terminal is greater than or equal to the region A2 of the first engagement portion 211.

[0213] Figure 11 This is a view used to describe the connecting member according to an embodiment of the present invention.

[0214] The connecting member 200 according to an embodiment of the present invention (including, for example) Figures 4 to 10 The connecting member shown includes a first member 210 and a second member 220. The first member 210 is provided with an insertion channel 212 formed on one side, and the second member 220 is provided with an insertion portion formed on one side and is connected to the first member 210 when the insertion portion is inserted into the insertion channel.

[0215] The plurality of battery cells 100 includes a first battery cell 100a and a second battery cell 100b electrically connected by a connecting member 200. In one embodiment, the plurality of battery cells 100 may further include a third battery cell 100c electrically connected by the connecting member 200.

[0216] exist Figure 11 In the attached drawing, reference numeral d1 denotes a first distance, which is the distance between the first battery cell 100a and the second battery cell 100b, which are electrically connected. The first distance d1 is the distance between the first terminal of the first battery cell 100a and the first terminal of the second battery cell 100b when viewed from above. The first distance d1 is also the distance between the center of the first battery cell 100a and the center of the second battery cell 100b when viewed from above. In this configuration, the first battery cell 100a and the second battery cell 100b are positioned adjacent to each other. In this configuration, the first battery cell 100a is connected to the first engagement portion 211 of the connecting member 200, and the second battery cell 100b is connected to the second engagement portion 221 of the connecting member 200.

[0217] In one embodiment, for example, the first distance d1 is 20.0 mm or more and 57.5 mm or less. In one embodiment, for example, the first distance d1 is 30.5 mm or more and 57.5 mm or less. In one embodiment, for example, the first distance d1 is 40.0 mm or more and 57.5 mm or less. In one embodiment, for example, the first distance d1 is 42.5 mm or more and 57.5 mm or less. In one embodiment, for example, the first distance d1 is 45.0 mm or more and 57.5 mm or less. In one embodiment, for example, the first distance d1 is 47.5 mm or more and 57.5 mm or less. In one embodiment, for example, the first distance d1 is 45.0 mm or more and 55.0 mm or less. In one embodiment, for example, the first distance d1 is 47.5 mm or more and 55.0 mm or less.

[0218] If the first distance d1 is less than 20.0 mm, the capacity of the multiple battery cells 100 connected by the connecting member 200 may become too small. If the first distance d1 is greater than 57.5 mm, the length of the first member 210 may become too long, which may increase the resistance of the connecting member 200.

[0219] Therefore, taking into account the capacity and / or current of the battery cell 100 connected by the connecting member 200, the capacity of the battery pack 1000 including the battery cell 100, etc., in one embodiment, the first distance d1 is 20.0 mm or more and 57.5 mm or less.

[0220] exist Figure 11 In the attached drawing, reference numeral d2 denotes a second distance, which is the distance between the first battery cell 100a and the third battery cell 100c, which are electrically connected. The second distance d2 is the distance between the first terminal of the first battery cell 100a and the first terminal of the third battery cell 100c when viewed from above. The second distance d2 is also the distance between the center of the first battery cell 100a and the center of the third battery cell 100c when viewed from above. In this configuration, the first battery cell 100a and the third battery cell 100c are positioned adjacent to each other. In this configuration, the first battery cell 100a is connected to the first engagement portion 211 of the connecting member 200, and the third battery cell 100c is also connected to the first engagement portion 211 of the connecting member 200.

[0221] In one embodiment, for example, the second distance d2 is 20.0 mm or more and 57.5 mm or less. In one embodiment, for example, the second distance d2 is 30.0 mm or more and 57.5 mm or less. In one embodiment, for example, the second distance d2 is 40.0 mm or more and 57.5 mm or less. In one embodiment, for example, the second distance d2 is 42.5 mm or more and 57.5 mm or less. In one embodiment, for example, the second distance d2 is 45.0 mm or more and 57.5 mm or less. In one embodiment, for example, the second distance d2 is 47.5 mm or more and 57.5 mm or less. In one embodiment, for example, the second distance d2 is 45.0 mm or more and 55.0 mm or less. In one embodiment, for example, the second distance d2 is 47.5 mm or more and 55.0 mm or less.

[0222] If the second distance d2 is less than 20.0 mm, the capacity of the multiple battery cells 100 connected by the connecting member 200 may become too small. If the second distance d2 is greater than 57.5 mm, the length of the first member 210 may become too long, which may increase the resistance of the connecting member 200.

[0223] Therefore, taking into account the capacity and / or current of the battery cell 100 connected by the connecting member 200, the capacity of the battery pack 1000 including the battery cell 100, etc., in one embodiment, the second distance d2 is 20.0 mm or more and 57.5 mm or less.

[0224] In one embodiment, the second distance d2 may be configured to be greater than or equal to the first distance d1.

[0225] exist Figure 11 In the accompanying drawings, reference numeral W1 denotes a first width W1, which is the width of the portion of the connecting member 200 that connects the first battery cell 100a and the second battery cell 100b. In this case, the first width W1 is the width of the portion of the connecting member 200 that connects the first battery cell 100a and the second battery cell 100b when viewed from above. In one embodiment, the first width W1 represents the width of the insertion channel 212. In one embodiment, the first width W1 includes the width of the insertion portion 222.

[0226] In one embodiment, for example, the first width W1 is 3 mm or more and 20 mm or less. For example, if the first width W1 includes the width of the insertion channel 212, then the first width W1 can be 4 mm to 20 mm. For example, if the first width W1 includes the width of the insertion portion 222, then the first width W1 can be 3 mm to 16 mm. If the first width W1 is less than 3 mm or greater than 20 mm, the resistance may become too high, or the balance of the connecting member 200 may be reduced.

[0227] exist Figure 11 In the accompanying drawings, reference numeral W2 denotes a second width W2, which is the width of the portion of the connecting member 200 that connects the first battery cell 100a and the third battery cell 100c. In this case, the second width W2 is the width of the portion of the connecting member 200 that connects the first battery cell 100a and the third battery cell 100c when viewed from above. That is, the second width W2 represents the width of the portion of the connecting member 200 that connects adjacent first joint portions 211.

[0228] In one embodiment, the second width W2 may be greater than or equal to the first width W1. In one embodiment, for example, the second width W2 is 9 mm or more and 20 mm or less. If the second width W2 is less than 9 mm or greater than 20 mm, the resistance may become too high, or the balance of the connecting member 200 may be reduced.

[0229] exist Figure 11 In this context, the first region S1 represents the area where the second component 220 can be joined to the battery cell 100. In this case, the first region S1 can be set according to the arrangement between the first components 210 in the connecting member 200, which includes a plurality of first components 210.

[0230] For example, the first region S1 may be defined by a first member 210 connected to a first terminal of an adjacent battery cell (e.g., first battery cell 100a), a first member (not shown) connected to a first terminal of another adjacent battery cell (not shown), and the upper surface of the corresponding battery cell (e.g., third battery cell 100c). In this case, the boundary of the first region S1 formed by the upper surface of the corresponding battery cell (e.g., third battery cell 100c) is called a first arc 2121. Furthermore, the boundary of the first region S1 formed by the first member 210 connected to the first terminal of an adjacent battery cell (e.g., first battery cell 100a) is called a first straight line 2122. Additionally, the boundary of the first region S1 formed by the first member connected to the first terminal of another adjacent battery cell is called a second straight line 2123.

[0231] In other words, the first region S1 can be formed into a sector shape using the first arc 2121, the first straight line 2122, and the second straight line 2123. In this case, the first region S1 can be formed into a sector shape that does not include the region corresponding to the first terminal of the corresponding battery cell (e.g., the third battery cell 100c). In this document, it can be described that the first region S1 is formed into a sector shape.

[0232] In this case, the straight line extending along the first straight line 2122 and the straight line extending along the second straight line 2123 can form a first angle θ1.

[0233] In one embodiment, for example, the first angle θ1 is formed to be less than 180°. If the first angle θ1 is greater than 180°, the number of secondary batteries 100 that can be accommodated in the battery pack 1000 can be reduced. That is, in this case, it is difficult to efficiently load the secondary batteries 100 into the battery pack 1000.

[0234] In one embodiment, for example, the first angle θ1 is formed to be 90° or greater. If the first angle θ1 is formed to be less than 90°, similarly, the number of secondary batteries 100 that can be accommodated in the battery pack 1000 is reduced. That is, in this case, it is difficult to efficiently load the secondary batteries 100 into the battery pack 1000.

[0235] However, for example, if the loading efficiency of the secondary battery 100 housed inside the battery pack 1000 is not considered, the first angle θ1 can be formed to be 30° or more and 330° or less. Alternatively, for example, the first angle θ1 can be formed to be 40° or more and 320° or less. Alternatively, for example, the first angle θ1 can be formed to be 50° or more and 310° or less. Alternatively, for example, the first angle θ1 can be formed to be 60° or more and 300° or less. Alternatively, for example, the first angle θ1 can be formed to be 70° or more and 290° or less. Alternatively, for example, the first angle θ1 can be formed to be 80° or more and 280° or less. Alternatively, for example, the first angle θ1 can be formed to be 90° or more and 270° or less.

[0236] In this case, if the first angle θ1 is less than 30° or greater than 330°, the engagement area of ​​the second member 220 may be reduced, thereby weakening the engagement between the second member 200 and the second terminal and / or increasing the resistance. Therefore, in one embodiment, the first angle θ1 is formed to be greater than 30° and less than 330°.

[0237] In addition, Figure 11 In this context, the second region S2 represents the region where the second component 220 is bonded to the battery cell 100. In this case, the second region S2 can be set based on the first region S1. In one embodiment, for example, the second region S2 is set to be less than or equal to the first region S1.

[0238] In one embodiment, for example, the second region S2 corresponds to the joining region of the second joining portion 221 and is formed in a fan shape. The second region S2 can be formed in a fan shape by a second arc 2211 corresponding to the arc of the second joining portion 221, a third straight line 2212 corresponding to the boundary of one side of the second joining portion 221, and a fourth straight line 2213 corresponding to the boundary of the other side of the second joining portion 221. In this case, the second region S2 is the shape of the region corresponding to the first terminal of the corresponding battery cell (e.g., the second battery cell 100b) excluded from the fan shape, but it can also be referred to as a fan shape.

[0239] In this case, the line extending along the third line 2212 and the line extending along the fourth line 2213 can form the second angle θ2.

[0240] In one embodiment, for example, the second angle θ2 is less than or equal to the first angle θ1. In one embodiment, for example, the second angle θ2 may be 30° or more and 330° or less. In one embodiment, for example, the second angle θ2 is 40° or more and 320° or less. In one embodiment, for example, the second angle θ2 is 50° or more and 310° or less. In one embodiment, for example, the second angle θ2 is 60° or more and 300° or less. In one embodiment, for example, the second angle θ2 is 70° or more and 290° or less. In one embodiment, for example, the second angle θ2 is 80° or more and 280° or less. In one embodiment, for example, the second angle θ2 is 90° or more and 270° or less.

[0241] Accordingly, the first component 210 can be arranged in the area where the second component 220 is joined to the battery cell 100. For example, the first region S1 can be less than or equal to half the area of ​​the upper surface of the housing 20 of the battery cell 100.

[0242] Figure 12 This is a perspective view schematically illustrating a battery pack according to an embodiment of the present invention.

[0243] The battery pack 1000 according to an embodiment of the present invention includes, for example, Figure 1 , Figure 4 and Figure 5 The battery pack shown includes: a plurality of battery cells 100, each of the plurality of battery cells 100 including a first terminal and a second terminal; and a connecting member 200 electrically connecting at least some of the plurality of battery cells 100 (including, for example, in...). Figures 4 to 11The connecting member 200 shown in the figure includes: a first member 210 having one side forming an insertion channel 212 and the other side forming a first engagement portion 211 that engages with a first terminal; and a second member 220 having one side forming an insertion portion 222 that is inserted into the insertion channel 212 and connected to the first member 210 and the other side forming a second engagement portion 221 that engages with a second terminal.

[0244] In one embodiment, at least one of the peel strength between the first bonding portion 211 and the first terminal and the peel strength between the second bonding portion 221 and the second terminal can be 50 kgf or more. In one embodiment, for example, the peel strength between the second bonding portion 221 and the second terminal is 50 kgf or more. Furthermore, the connecting member 200 can be provided with a high-strength connecting member through a sandwich structure. Additionally, the connecting member 200 can be provided with increased strength in the height direction of the battery cell 100.

[0245] In one embodiment, for example, the resistance formed between the first bonding portion 211 and the first terminal is less than 0.06 mΩ. In another embodiment, for example, the resistance formed between the second bonding portion 221 and the second terminal is less than 0.12 mΩ. Furthermore, the bonding strength of the connecting member 200 with the battery cell 100 can be improved by including a first member 210 and a second member 220 connected to each other. For example, the bonding strength of the connecting member 200 with the battery cell 100 can be improved by including a first member 210 and a second member 220 comprising different materials.

[0246] Table 1 below shows experimental data comparing the effects of the connecting member 200 according to an embodiment of the present invention with those of a conventional connecting member. Table 1

[0247] In Table 1, the first terminal comprises Al3003, and the second terminal comprises SPCE. In Table 1, the thickness of the first terminal is 0.8T. In Table 1, the thickness of the second terminal is 0.8T.

[0248] In Table 1, Comparative Example 1 is a connecting member comprising a single material, Cu1100, and having a thickness of 0.5T. Additionally, Comparative Example 2 in Table 1 is a connecting member comprising a single material, Al1050, and having a thickness of 0.5T. Furthermore, the examples in Table 1 are connecting members made of different materials, wherein the first member 210 comprises Al1050 and has a thickness of 0.5T, and the second member 220 comprises Cu and has a thickness of 0.5T.

[0249] In Table 1, Comparative Example 1 was coupled to the first terminal under conditions of 1.5 kW power and 300 mm / s speed. In Table 1, the Example was coupled to the first terminal under conditions of 1.3 kW power and 300 mm / s speed.

[0250] In Table 1, Comparative Example 2 was connected to the second terminal under conditions of 1.5 kW power and 410 mm / s speed. In Table 1, the Example was connected to the second terminal under conditions of 1.6 kW power and 300 mm / s speed.

[0251] In Table 1, the strength (kgf) is the peel strength measured by the peel test.

[0252] As can be seen from Table 1, compared to Comparative Example 1, which is made of a single material of Cu, the Example exhibits approximately 5 times the strength between the first terminal and the connecting member. Furthermore, compared to Comparative Example 2, which is made of a single material of Al, the Example exhibits approximately 8 times the strength between the second terminal and the connecting member.

[0253] Furthermore, as can be seen from Table 1, the examples have lower resistance values ​​than Comparative Examples 1 and 2, which are formed from a single component.

[0254] According to embodiments of the present invention, a connecting member with improved welding reliability and / or a battery pack including the connecting member is provided.

[0255] According to an embodiment of the present invention, a battery pack having a high-strength connecting member and / or including the connecting member is provided.

[0256] According to an embodiment of the present invention, a battery pack with improved stability is provided.

[0257] However, the aspects and technical effects that can be obtained through the present invention are not limited to those described above, and those skilled in the art will clearly understand from the description of the present invention other aspects and technical effects not described.

[0258] Although the invention has been described with reference to embodiments shown in the accompanying drawings, these embodiments are merely examples, and those skilled in the art will understand that various modifications and equivalents are possible.

[0259] Therefore, the scope of protection of this invention should be determined by the claims.

Claims

1. A connecting member, comprising: The first component includes an insertion channel on one side; as well as The second component includes an insertion portion on one side and is connected to the first component when the insertion portion is inserted into the insertion channel.

2. The connecting member according to claim 1, wherein the first member comprises a first material, and The second component comprises a second material that is different from the first material.

3. The connecting member according to claim 1, wherein a bonding interface is formed between the insertion portion and the insertion channel, which is bonded in a semi-molten or room temperature molten state.

4. The connecting member according to claim 1, wherein the length of the section of the insertion portion inserted into the insertion channel is more than 30% and less than 60% of the width of the insertion portion.

5. The connecting member according to any one of claims 1 to 4, wherein the thickness of the second member is more than 15% and less than 45% of the thickness of the first member.

6. A battery pack, comprising: Multiple battery cells, each of the multiple battery cells including a first terminal and a second terminal; as well as The connecting member electrically connects at least some of the plurality of battery cells. The connecting member includes: A first component includes an insertion channel and a first engagement portion, the insertion channel being located on a first side of the first component, and the first engagement portion being located on a second side of the first component and engaging with the first terminal of a battery cell among the plurality of battery cells; as well as The second component includes an insertion portion and a second engagement portion. The insertion portion is located on a first side of the second component and is inserted into the insertion channel and connected to the first component. The second engagement portion is located on a second side of the second component and is engaged with the second terminal of one of the plurality of battery cells.

7. The battery pack of claim 6, wherein the first terminal comprises a material different from that of the second terminal.

8. The battery pack of claim 6, wherein the first component comprises a first material, and The second component comprises a second material that is different from the first material.

9. The battery pack of claim 8, wherein the first terminal comprises the first material, and The second terminal includes the second material.

10. The battery pack of claim 8, wherein the first terminal comprises aluminum, and The first material includes aluminum.

11. The battery pack of claim 8, wherein the second terminal comprises one or more of iron and stainless steel, and The second material includes one or more of copper, nickel, tungsten, silver, gold, titanium, and their alloys.

12. The battery pack according to claim 6, wherein a bonding interface is formed between the insertion portion and the insertion channel, which is bonded in a semi-molten or room temperature molten state.

13. The battery pack according to claim 6, wherein the length of the section of the insertion portion inserted into the insertion channel is more than 30% and less than 60% of the width of the insertion portion.

14. The battery pack according to claim 6, wherein the thickness of the second component is more than 15% and less than 45% of the thickness of the first component.

15. The battery pack of claim 6, wherein at least one of the peel strength between the first bonding portion and the first terminal and the peel strength between the second bonding portion and the second terminal is 50 kgf or more.

16. The battery pack of claim 6, wherein the resistance formed between the first joint portion and the first terminal is less than 0.06 mΩ.

17. The battery pack of claim 6, wherein the resistance formed between the second junction portion and the second terminal is less than 0.12 mΩ.

18. The battery pack according to claim 6, wherein, At the interface between the first joint portion and the first terminal, the area of ​​the first terminal is greater than or equal to the area of ​​the first joint portion.

19. The battery pack of claim 6, wherein the plurality of battery cells includes a first battery cell and a second battery cell electrically connected via the connecting member, and The distance between the first terminal of the first battery cell and the first terminal of the second battery cell is more than 20 mm and less than 57.5 mm.

20. The battery pack according to any one of claims 6 to 19, wherein each of the plurality of battery cells further comprises: An electrode assembly, including a first electrode and a second electrode; A housing, electrically connected to the second electrode to form the second terminal, and housing the electrode assembly; as well as A rivet is electrically connected to the first electrode to form the first terminal and is coupled to a hole in the housing.

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