Battery module

Abstract

The invention relates to a battery module, and aims to solve the technical problem of providing a battery module capable of eliminating pressure imbalance. To this end, the present disclosure provides a battery module, the battery module comprising: a cell assembly comprising a plurality of battery cells; and a band including an elastic material and surrounding the cell assembly while applying pressure, in which each of the plurality of battery cells includes: a housing; and a pair of wire tabs extending from at least one side of the housing and passing through the tape.

Description

[0001] This application claims priority and benefit to Korean Patent Application No. 10-2024-0140647, filed on October 15, 2024, with the Korean Intellectual Property Office, the entire disclosure of which is incorporated herein by reference. Technical Field

[0002] This disclosure relates to a battery module including a belt. Background Technology

[0003] A single battery cell can be charged and discharged. Low-capacity battery cells are used in portable small electronic devices such as smartphones, feature phones, laptops, digital cameras, and camcorders, while high-capacity battery cells are widely used as power sources and energy storage batteries for driving electric motors in hybrid and electric vehicles. Such a battery cell includes an electrode assembly containing electrodes, a housing that houses the electrode assembly, and electrode terminals connected to the electrode assembly, the electrodes comprising a positive electrode and / or a negative electrode.

[0004] With technological advancements, there is a need for battery cells with high capacity. Therefore, multiple battery cells can be electrically connected and used. For example, battery cells can be applied to electronic devices in the form of battery modules and / or battery packs comprising multiple battery cells. In this case, the electronic device is one that requires high power and / or high capacity, and includes, for example, electric vehicles.

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

[0006] The present invention provides a battery module including a band for pressurizing individual battery cells.

[0007] However, the problems to be solved by the present invention are not limited to those described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

[0008] To address the aforementioned technical problems, a battery module according to an embodiment of the present invention is provided, the battery module comprising: a cell assembly including a plurality of battery cells; and a strip comprising an elastic material and surrounding the cell assembly while pressure is applied, and each battery cell comprising: a housing; and a pair of terminals extending from at least one side of the housing and passing through the strip.

[0009] According to the present invention, a battery module can be provided that maintains a uniform pressure when pressure changes due to expansion during charging and discharging.

[0010] According to the present invention, a battery module with improved stability and / or improved lifespan can be provided.

[0011] However, the effects to be achieved by the present invention are not limited to the problems described above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. Attached Figure Description

[0012] The following accompanying drawings are intended to illustrate exemplary embodiments of the invention. The spirit of the invention will be more clearly understood from the drawings and the following description of the invention. Therefore, the invention should not be construed as limited to the content described in these drawings, wherein: Figure 1 This is a schematic perspective view of a battery cell according to an embodiment of the present invention; Figure 2 This is a schematic front view of a battery cell according to an embodiment of the present invention; Figure 3 This is a schematic perspective view of a battery module according to an embodiment of the present invention; Figure 4 This is a schematic perspective view of a battery module according to an embodiment of the present invention; Figure 5 This is a schematic perspective view of a battery module according to an embodiment of the present invention; Figure 6A and Figure 6B A strip is schematically shown according to an embodiment of the present invention; Figure 7A and Figure 7B A strip is schematically shown according to an embodiment of the present invention; Figure 8 A strip is schematically shown according to an embodiment of the present invention; Figure 9 A strip is schematically shown according to an embodiment of the invention; and Figure 10 A strip is schematically shown according to an embodiment of the present invention. Detailed Implementation

[0013] Embodiments of the present invention will be described in detail below. However, these embodiments are presented by way of example only, and the invention is not limited thereto, but is defined only by the scope of the claims.

[0014] Unless otherwise stated herein, when a component such as a layer, membrane, region, or plate is described as being “on” another component, this includes not only the case where the component is “directly on” another component, but also the case where there is yet another component in between.

[0015] Unless otherwise stated herein, singular expressions may also include plural forms. Furthermore, unless otherwise stated, "A or B" may mean "including A, including B, or including both A and B".

[0016] As used here, “the combination of them” can mean a mixture of components, a laminate, a complex, a copolymer, an alloy, a blend, a reaction product, etc.

[0017] Unless otherwise defined herein, the term "particle size" may refer to the average particle size. Alternatively, particle size refers to the average particle size (D50), which means the diameter of particles that constitute 50% of the total volume in a particle size distribution. The average particle size (D50) can be measured by methods known to those skilled in the art; for example, the average particle size (D50) can be measured using a particle size analyzer, or by transmission electron microscopy or scanning electron microscopy. Optionally, the value of the average particle size (D50) can be calculated after measurement using a measuring device utilizing dynamic light scattering, data analysis, and counting of the number of particles in each particle size range. Optionally, the average particle size (D50) can be measured by laser diffraction. More specifically, when measured by laser diffraction, the average particle size (D50) can be measured by dispersing the particles to be measured in a dispersion solvent and introducing the dispersed particles into a commercially available laser diffraction particle size measuring device (e.g., the MT3000 available from Microtrac), irradiating them with ultrasonic waves at a power of 60W at approximately 28kHz, and calculating the average particle size (D50) based on 50% of the particle size distribution in the measuring device.

[0018] Figure 1 This is a schematic perspective view of a battery cell according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic front view of a battery cell according to an embodiment of the present invention.

[0020] exist Figure 1 and Figure 2 In this text, 100 represents a battery cell 100 according to an embodiment of the present invention. Additionally, in... Figure 1 and Figure 2 In the diagram, the X-axis represents the width of the battery cell 100. The Y-axis represents the longitudinal direction of the battery cell 100. The Z-axis represents the height of the battery cell 100. Here, the X-axis is perpendicular to both the Y-axis and the Z-axis. Here, the Y-axis is perpendicular to both the X-axis and the Z-axis. Here, the Z-axis is perpendicular to both the X-axis and the Y-axis.

[0021] The battery cell 100 includes: a housing 120; and a pair of terminals 110 extending from at least one side of the housing and passing through a strip.

[0022] 100 cells The battery cell 100 may include: an electrode assembly with a separator positioned between a positive electrode and a negative electrode; and a housing 120 for accommodating the electrode assembly. The positive electrode, negative electrode, and separator may be impregnated with an electrolyte (not shown).

[0023] Positive electrode active material As the positive electrode active material, compounds capable of reversibly inserting and deintercalating lithium (lithium-intercalating compounds) can be used. Specifically, one or more composite oxides of lithium with metals selected from cobalt, manganese, nickel, and combinations thereof can be used.

[0024] The composite oxide can be a lithium transition metal composite oxide, and specific examples of composite oxides can include lithium nickel oxides, lithium cobalt oxides, lithium manganese oxides, lithium iron phosphate compounds, cobalt-free lithium nickel manganese oxides, or combinations thereof.

[0025] As an example, a compound represented by any of the following chemical formulas can be used: Li a A 1-b X b O 2-c D c (0.90≤a≤1.8, 0≤b≤0.5, 0≤c≤0.05); Li a Mn 2-b X b O 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 O 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 O 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); Lia 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).

[0026] 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.

[0027] As an example, the positive electrode active material can be a high-nickel positive electrode active material, based on 100 mol% of metals other than lithium in a lithium transition metal composite oxide. The nickel content of the high-nickel positive electrode active material is 80 mol% or higher, 85 mol% or higher, 90 mol% or higher, 91 mol% or higher, 94 mol% or higher, and 99 mol% or lower. High-nickel positive electrode active materials can achieve high capacity and therefore can be applied to battery cells with high capacity and high density.

[0028] positive electrode 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 also include a binder and / or a conductive material.

[0029] As an example, the positive electrode may also include additives that can be used as a sacrificial positive electrode.

[0030] Based on a 100wt% positive electrode active material layer, the content of the positive electrode active material can be from 90wt% to 99.5wt%, and based on the 100wt% positive electrode active material layer, the content of each of the binder and conductive material can be from 0.5wt% to 5wt%.

[0031] The binder is used to ensure good adhesion between the particles of the positive electrode active material and to the current collector. Representative examples of binders may include polyvinyl alcohol, carboxymethyl cellulose, hydroxypropyl cellulose, diacetyl cellulose, polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene oxide-containing polymers, polyvinylpyrrolidone, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, epoxy resin, (meth)acrylate resin, polyester resin, and nylon, but the invention is not limited thereto.

[0032] Conductive materials are used to provide conductivity to electrodes, and any conductive material that does not cause chemical changes can be used in the constructed battery. Examples of conductive materials may include carbon-based materials such as natural graphite, synthetic graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, or carbon nanotubes; metallic materials in the form of metal powders or metal fibers and containing copper, nickel, aluminum, or silver; conductive polymers such as polyphenylene derivatives; or mixtures thereof.

[0033] Al can be used as the current collector, but the present invention is not limited thereto.

[0034] Negative electrode active material The negative electrode active material can be a material capable of reversibly inserting / deintercalating lithium ions, lithium metal, lithium and metal alloys, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0035] Materials capable of reversibly inserting / deintercalating lithium ions can be carbon-based negative electrode active materials, such as crystalline carbon, amorphous carbon, or combinations thereof. Examples of crystalline carbon can be graphite, such as amorphous, plate-like, sheet-like, spherical, or fibrous natural or artificial graphite, while examples of amorphous carbon can be soft or hard carbon, mesophase pitch carbides, or calcined coke.

[0036] Lithium alloys can be lithium alloys with metals selected from Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Si, Sb, Pb, In, Zn, Ba, Ra, Ge, Al, and Sn.

[0037] As materials capable of doping and dedoping lithium, either Si-based or Sn-based negative electrode active materials can be used. Si-based negative electrode active materials can be silicon, silicon-carbon composites, or SiO₂.x where \(0 \lt x \lt 2\), a Si-Q alloy (where Q is selected from alkali metals, alkaline earth metals, Group 13 elements, Group 14 elements (excluding Si), Group 15 elements, Group 16 elements, transition metals, rare earth elements, and combinations thereof), or a combination thereof. The Sn-based negative electrode active material can be Sn, \(SnO_2\), a Sn-based alloy, or a combination thereof.

[0038] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to one embodiment, the silicon-carbon composite can include silicon particles surface-coated with amorphous carbon. For example, the silicon-carbon composite can 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 can also be located between the silicon primary particles such that the silicon primary particles can be coated with amorphous carbon. The secondary particles can be dispersed in an amorphous carbon matrix.

[0039] The silicon-carbon composite can also include crystalline carbon. For example, the silicon-carbon composite can include a core containing crystalline carbon and silicon particles and an amorphous carbon coating located on the surface of the core.

[0040] The Si-based negative electrode active material or the Sn-based negative electrode active material can be used in combination with a carbon-based negative electrode active material.

[0041] Negative electrode The negative electrode of the battery cell 100 includes a current collector and a negative electrode active material layer located on the current collector. The negative electrode active material layer can include a negative electrode active material and also includes a binder and / or a conductive material.

[0042] For example, the negative electrode active material layer can include 90 wt% to 99 wt% of a negative electrode active material, 0.5 wt% to 5 wt% of a binder, and 0 wt% to 5 wt% of a conductive material.

[0043] The binder is used to make the particles of the negative electrode active material adhere well to each other and make the negative electrode active material adhere well to the current collector. A non-aqueous binder, an aqueous binder, a dry binder, or a combination thereof can be used as the binder.

[0044] The non-aqueous binder can be polyvinyl chloride, carboxylated polyvinyl chloride, polyvinyl fluoride, ethylene propylene copolymer, polystyrene, polyurethane, polytetrafluoroethylene, polyvinylidene fluoride, polyethylene, polypropylene, polyamideimide, polyimide, or a combination thereof.

[0045] Waterborne adhesives can be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluorinated elastomers, 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.

[0046] When using an aqueous binder as the negative electrode binder, it may also include a cellulose compound that imparts viscosity. One or more of carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and their alkali metal salts may be used as the cellulose compound in combination. Na, K, or Li may be used as the alkali metal.

[0047] Dry binders can be fibrous polymeric materials, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0048] Conductive materials are used to provide conductivity to electrodes, and any conductive material that does not cause chemical changes can be used in the constructed battery. Specific examples of conductive materials may include carbon-based materials such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, or carbon nanotubes; metallic materials in the form of metal powders or metal fibers and containing copper, nickel, aluminum, or silver; conductive polymers such as polyphenylene derivatives; or mixtures thereof.

[0049] 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.

[0050] Electrolyte (not shown) The electrolyte used in the battery cell 100 includes a non-aqueous organic solvent and a lithium salt.

[0051] Non-aqueous organic solvents are used as a medium through which ions participating in the electrochemical reactions of the battery can move.

[0052] Non-aqueous organic solvents can be carbonate solvents, ester solvents, ether solvents, ketone solvents, alcohol solvents, aprotic solvents, or combinations thereof.

[0053] As carbonate solvents, dimethyl carbonate (DMC), diethyl carbonate (DEC), dipropyl carbonate (DPC), methyl propyl carbonate (MPC), ethyl propyl carbonate (EPC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), propylene carbonate (PC), or butyl carbonate (BC) can be used.

[0054] As ester solvents, methyl acetate, ethyl acetate, n-propyl acetate, dimethyl acetate, methyl propionate, ethyl propionate, decanoic acid lactone, mevalonate lactone, valonate lactone, or caprolactone can be used.

[0055] As ether solvents, dibutyl ether, tetraethylene glycol dimethyl ether, diethylene glycol dimethyl ether, dimethoxyethane, 2-methyltetrahydrofuran, 2,5-dimethyltetrahydrofuran, or tetrahydrofuran can be used. Additionally, as ketone solvents, cyclohexanone can be used. As alcohol solvents, ethanol or isopropanol 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, including double bonds, aromatic rings, or ether bonds) can be used; amides such as dimethylformamide; dioxolane, such as 1,3-dioxolane and 1,4-dioxolane; or sulfolane.

[0056] The above examples of non-aqueous organic solvents can be used alone or in combination of two or more of them.

[0057] In addition, when using carbonate solvents, cyclic carbonates and chain carbonates can be mixed and used, and cyclic carbonates and chain carbonates can be mixed in a volume ratio of 1:1 to 1:9.

[0058] Lithium salts are materials dissolved in organic solvents and used in batteries as lithium-ion sources to enable the basic operation of battery cells and to facilitate 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) (where x and y are integers from 1 to 20), lithium trifluoromethane sulfonate, lithium tetrafluoroethane sulfonate, lithium difluorobis(oxalate)phosphate (LiDFBOP), and lithium bis(oxalate)borate (LiBOB).

[0059] diaphragm Depending on the type of battery cell 100, a separator can be present between the positive electrode and the negative electrode. As the separator, polyethylene, polypropylene, polyvinylidene fluoride, or multilayer membranes of two or more layers thereof can be used. Of course, mixed multilayer membranes can be used, such as a two-layer polyethylene / polypropylene separator, a three-layer polyethylene / polypropylene / polyethylene separator, or a three-layer polypropylene / polyethylene / polypropylene separator.

[0060] The membrane may include a porous substrate and a coating on one or both surfaces of the porous substrate, comprising organic materials, inorganic materials, or combinations thereof.

[0061] 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, polyetheretherketone, 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.

[0062] Organic materials may include polymers such as polyvinylidene fluoride or (meth)acrylic acid polymers.

[0063] Inorganic materials may include 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, but the invention is not limited thereto.

[0064] Organic and inorganic materials can exist as a mixture in a coating, or they can exist as a stack of coatings containing organic materials and coatings containing inorganic materials.

[0065] According to one embodiment of the present invention, a battery cell 100 includes an electrode assembly, a housing 120, and / or a terminal block 110. The battery cell 100 may also include a pair of cover plates 130.

[0066] exist Figure 1 and Figure 2 The diagram shows a battery cell 100 with a prism shape, but the shape of the battery cell 100 according to one embodiment of the invention is not limited thereto. The battery cell 100 can be formed in any shape in which a pair of terminals extend from at least one side; for example, the battery cell 100 can be pouch-shaped. In the following description, the battery cell 100 with a prism shape is used as an example of a lithium-ion secondary battery.

[0067] The electrode assembly includes a first electrode, a second electrode, and a diaphragm disposed between the first electrode and the second electrode. The first electrode includes, for example, a positive electrode or a negative electrode. The second electrode includes, for example, a negative electrode or a positive electrode.

[0068] The electrode assembly is formed by stacking a first electrode, a second electrode, and a separator. For example, the electrode assembly can be formed into an electrode core by winding the stacked first electrode, second electrode, and separator. Alternatively, the electrode assembly can be formed into a stack by stacking the first electrode, second electrode, and separator.

[0069] The housing 120 forms the overall appearance of the battery cell 100. For example, the housing 120 may include a conductive metal, such as aluminum, aluminum alloy, nickel-plated steel, stainless steel, SUS304, or carbon steel.

[0070] The housing 120 provides space to accommodate the electrode assembly. Therefore, the housing 120 accommodates the electrode assembly. The housing 120 protects the electrode assembly from external impacts. The housing 120 can perform a heat dissipation function to release the heat generated by the charging / discharging operation of the electrode assembly to the outside.

[0071] The housing 120 includes a pair of narrow sides 121, 122 and a pair of wide sides 123.

[0072] A pair of narrow sides 121, 122 are formed facing each other. For example, the narrow sides include a first narrow side 121 and a second narrow side 122 facing the first narrow side 121. Each of the pair of narrow sides 121, 122 may have, for example, a generally rectangular plate shape. Here, the pair of narrow sides 121, 122 may have, for example, similar or identical areas.

[0073] A pair of wide sides 123 are formed facing each other. Figure 1 and Figure 2 The image shows only one of a pair of wide sides 123 facing each other. Each of the pair of wide sides 123 may have a generally rectangular plate shape. Here, the pair of wide sides 123 may have, for example, similar or identical areas. Alternatively, the pair of wide sides 123 may be formed, for example, to have an area larger than at least one of the pair of narrow sides 121, 122.

[0074] Each wide side 123 is connected to an edge of a narrow side 121 or 122. For example, one edge of a wide side 123 is connected to a first narrow side 121. Additionally, another edge of a wide side 123 is connected to a second narrow side 122. Alternatively, for example, one edge of another wide side 123 is connected to a first narrow side 121. Additionally, another edge of a wide side 123 is connected to a second narrow side 122. Due to this structure, a pair of narrow sides 121, 122 and a pair of wide sides 123 can be connected to each other.

[0075] The housing 120 has openings. For example, the housing 120 may have a first opening on one side of a pair of narrow sides 121, 122 and a pair of wide sides 123 and a second opening on the other side. The first opening and the second opening may be formed facing each other, for example.

[0076] A pair of cover plates 130 may include a first cover plate 130P and a second cover plate 130N facing each other.

[0077] Each cover plate 130 is coupled to each opening. For example, the first cover plate 130P is coupled to the first opening. Additionally, for example, the second cover plate 130N is coupled to the second opening.

[0078] Terminal 110 is electrically connected to the electrode assembly. Terminal 110 is exposed to the outside, allowing the electrode assembly to be electrically connected to the outside. For example, terminal 110 is electrically connected to a busbar. Terminal 110 may be referred to as, for example, a terminal. That is, terminal 110 may include all components electrically connected to the electrode assembly and exposed to the outside of the battery cell 100.

[0079] The connector 110 includes, for example, a first connector 110P and a second connector 110N. The first connector 110P is electrically connected to a first electrode. The second connector 110N is electrically connected to a second electrode.

[0080] The cover 130 can provide space in which the terminal piece 110 can protrude to the outside of the battery cell 100. For example, a first terminal piece 110P passes through the first cover 130P and is exposed to the outside. For example, a second terminal piece 110N passes through the second cover 130N and is exposed to the outside.

[0081] Here, as Figure 1 and Figure 2 As shown, the first terminal block 110P and the second terminal block 110N can be exposed by extending in opposite directions. However, with Figure 1 and Figure 2 The first terminal block 110P and the second terminal block 110N shown are different; the first terminal block 110P and the second terminal block 110N can be exposed by extending in the same direction. In this case, the cover plate 130 may include only one cover plate. Alternatively, the battery cell 100 may not include a separate cover plate 130, and the first terminal block 110P and the second terminal block 110N may be exposed to the outside of the housing 120. Here, the housing 120 may be formed in a pouch shape.

[0082] Figure 3 This is a schematic perspective view of a battery module according to an embodiment of the present invention.

[0083] A battery module 1000 according to an embodiment of the present invention includes: a cell assembly 300 including a plurality of battery cells 100; and a strip 200 including an elastic material and surrounding the cell assembly 300 when pressure is applied.

[0084] The battery module 1000 includes multiple battery cells 100. Each battery cell 100 can be used as a single structural unit for storing and / or supplying power within the battery module 1000. Optionally, the battery module 1000 includes one or more cell assemblies 300. Therefore, the battery module 1000 can charge / discharge electrical energy at a higher capacity than that of a single battery cell 100.

[0085] The single-cell module 300 includes multiple battery cells 100.

[0086] Multiple battery cells 100 are arranged, for example, in the longitudinal direction Y. For example, each battery cell 100 includes a first side and a second side, the first and second sides facing each other. Here, the first and second sides comprise the wide surfaces of the side faces of the battery cell 100. For example, one of the multiple battery cells 100 may be arranged such that the first side faces the second side of another battery cell adjacent to that respective battery cell. Here, the longitudinal direction Y can be a direction from the first side toward the second side. For example, the longitudinal direction Y can be the direction in which the maximum volume change of the battery cell 100 occurs when the battery cell 100 expands.

[0087] At the same time, Figure 3 The diagram shows an example of a battery module 1000 including a single cell assembly 300, but the number of cell assemblies 300 that can be included in the battery module 1000 is not limited thereto. For example, the battery module 1000 may include two or more cell assemblies 300. Here, a single cell assembly 300 is a cell structure comprising a plurality of battery cells 100 and pressurized by a belt 200. Additionally, when the battery module 1000 includes a plurality of cell assemblies 300, although not shown, the battery module 1000 may also include additional belts surrounding and pressurizing the plurality of cell assemblies 300. Furthermore, when the battery module 1000 includes a plurality of cell assemblies 300, the battery module 1000 may include a housing accommodating the plurality of cell assemblies 300, and the method by which the battery module 1000 accommodates and / or combines the plurality of cell assemblies 300 is not limited.

[0088] The strip 200 is configured to surround the cell assembly 300. For example, the strip 200 is configured to surround at least a portion of the side of the cell assembly 300. For example, the strip 200 surrounds the side of the cell assembly 300 in four directions and combines a plurality of battery cells 100 included in the cell assembly 300. Thus, the strip 200 can combine a plurality of battery cells 100 to form the cell assembly 300.

[0089] Additionally, belt 200 can apply pressure to the individual component 300. For this purpose, belt 200 includes an elastic material. For example, belt 200 may include an elastic material with a tensile strength of 50 MPa or higher.

[0090] To absorb and / or prevent expansion occurring in monomer component 300, the elastic material has, for example, durability and / or elasticity. The elastic material includes at least one selected from, for example, the group consisting of rubber, polymer resin, thermoplastic resin, metal, and combinations thereof.

[0091] The rubber may include, for example, one or more selected from the group consisting of butadiene rubber, styrene-butadiene rubber, acrylonitrile-butadiene rubber, chloroprene rubber, polyisoprene rubber, isobutylene-isoprene copolymer, ethylene-propylene rubber, ethylene-vinyl acetate copolymer, chlorinated polyethylene, chlorosulfonated polyethylene, acrylic rubber, ethylene-acrylate copolymer, fluorinated elastomers, silicone rubber, polyurethane elastomers, polyester polyurethane, polyether polyurethane, hydrogenated acrylonitrile-butadiene rubber, acrylonitrile-butadiene rubber, carboxylated acrylonitrile-butadiene rubber, and combinations thereof.

[0092] Polymer resins include, for example, synthetic fibers. Polymer resins may include, for example, one or more selected from the group consisting of polyolefin resins, polyethylene, polypropylene, polyimide, polybutylene terephthalate, polytetrafluoroethylene, polystyrene, vinyl chloride, vinylidene chloride, fluoropolymers, acrylic resins, polyvinyl acetate resins, polyamide resins, polycarbonate, acetal resins, polyphenylene ether, polyester, polysulfone, nylon, and combinations thereof.

[0093] Metals may include, for example, one or more selected from the group consisting of SUS, titanium, aluminum and their alloys.

[0094] Simultaneously, for example, the belt 200 can be formed such that the surface facing the monomer component 300 is correspondingly flat with respect to the monomer component 300. For this purpose, the belt 200 can be formed into a shape that is efficiently manufactured and can apply pressure to the monomer component 300. Optionally, for example, the belt 200 can have holes, or it can be formed into a mesh structure. Therefore, the belt 200 can more effectively absorb and / or prevent expansion.

[0095] Meanwhile, the strip 200 is formed to have a first height h1, and the individual component 300 is formed to have a second height h2. Here, height refers to the dimension of the corresponding component in the height direction Z.

[0096] The first height h1 is designed to be lower than the second height h2. Optionally, for example, the first height h1 is designed to be greater than or equal to 40% and less than or equal to 100% of the second height h2. Optionally, for example, the first height h1 is designed to be greater than or equal to 45% and less than or equal to 100% of the second height h2. Optionally, for example, the first height h1 is designed to be greater than or equal to 50% and less than or equal to 100% of the second height h2. Optionally, for example, the first height h1 is designed to be greater than or equal to 55% and less than or equal to 100% of the second height h2. Optionally, for example, the first height h1 is designed to be greater than or equal to 60% and less than or equal to 100% of the second height h2. Optionally, for example, the first height h1 is designed to be greater than or equal to 65% and less than or equal to 100% of the second height h2. Alternatively, for example, the first height h1 is designed to be greater than or equal to 70% of the second height h2 and less than or equal to 100% of the second height h2.

[0097] When the first height h1 is greater than 100% of the second height h2, the capacity efficiency of the battery module 1000 may be reduced due to the band 200. Additionally, when the first height h1 is less than 40% of the second height h2, the band 200 may not be able to provide sufficient pressure to the individual module 300.

[0098] Thus, the strip 200 can be formed to cover most (or a large portion) of the side surface of the individual component 300 (or to extend beyond most (or a large portion) of the side surface of the individual component 300), and for example, the strip 200 preferably has a height of 30% or more of the height of the individual component 300. Additionally, the ratio of the area of ​​the side surface of the individual component 300 facing the strip 200 to the entire area can be greater than or equal to 40% and less than or equal to 100%. Optionally, for example, the ratio of the area of ​​the side surface of the individual component 300 facing the strip 200 to the entire area can be greater than or equal to 50% and less than or equal to 100%. Optionally, for example, the ratio of the area of ​​the side surface of the individual component 300 facing the strip 200 to the entire area can be greater than or equal to 60% and less than or equal to 100%. Optionally, for example, the ratio of the area of ​​the side surface of the individual component 300 facing the strip 200 to the entire area can be greater than or equal to 70% and less than or equal to 100%.

[0099] Therefore, belt 200 can provide sufficient pressure to the individual component 300. Furthermore, belt 200 can provide uniform pressure to the individual component 300 in all directions.

[0100] Because of this structure, the battery module 1000 according to an embodiment of the present invention can prevent the battery cell 100 and / or the battery module 1000 from permanent deformation due to expansion, and solve various problems caused by pressure imbalance.

[0101] Additionally, the battery module 1000 can use straps 200 to fasten multiple battery cells 100 and / or cell assemblies 300, thereby securing multiple battery cells 100 without additional components such as separate module housings or plates. Therefore, the battery module 1000 can provide a method for improving manufacturing efficiency and cost.

[0102] Figure 4 This is a schematic perspective view of a battery module according to an embodiment of the present invention.

[0103] According to an embodiment of the present invention, a battery module 1000 includes a protective member 400 located between a single cell assembly 300 and a belt 200, and pressurizes the single cell assembly 300.

[0104] The protective member 400 protects the cell assembly 300 between the expansion force inside the cell assembly 300 and the pressure exerted by the belt 200 on the outside of the cell assembly 300. For example, when the battery cell 100 has a pouch-like cell shape, the shape of the cell assembly 300 may be deformed due to the pressure of the belt 200. While the belt 200 absorbs and / or prevents the expansion of the cell assembly 300, the protective member 400 prevents the cell assembly 300 from deforming due to the pressure of the belt 200.

[0105] For this purpose, the protective member 400 has high bending strength. For example, the protective member 400 has a bending strength of 200 MPa or higher. Here, the bending strength is based on ASTM D790. Therefore, even when the belt 200 applies a high mechanical load to the individual assembly 300, the protective member 400 can effectively protect the individual assembly 300.

[0106] The protective component 400 may include, for example, a first material. For example, the first material may include fibers. Here, the fibers include, for example, at least one or a mixture of at least two selected from the group consisting of fibrous inorganic materials such as glass wool, rock wool, gypsum fiber, silica fiber, alumina fiber, zirconia fiber, and carbon fiber. Optionally, the fibers include, for example, at least one or a mixture of at least two selected from the group consisting of fibrous metallic materials such as gold, silver, iron, steel, aluminum, beryllium, tungsten, molybdenum, and stainless steel.

[0107] In addition, the protective component 400 may include, for example, a second material. For example, the second material includes at least one or a mixture of at least two selected from the group consisting of ABS, SAN, polystyrene, MPPO, polycarbonate, polysulfone, polyetherimide, polypropylene, polyethylene (HDPE), acetal, PBT, nylon 6, nylon 66, nylon 46, nylon 610, nylon 612, nylon 11, nylon 12, amorphous nylon, polyetheretherketone, polyphenylene sulfide, and polyphthalamide (PPA).

[0108] Additionally, the protective component 400 may include, for example, a mixture of a first material and a second material.

[0109] The protective member 400 may be formed, for example, in the form of a plate. For example, the protective member 400 may be formed in the form of a plate and positioned between the belt 200 and the individual assembly 300. Alternatively, for example, the protective member 400 may be formed in the form of a plate and fixed to the belt 200 and / or the individual assembly 300.

[0110] Alternatively, the protective member 400 can be formed by coating the outer surface of the individual component 300. For example, the protective member 400 can be formed by coating at least a portion of the outer surface of the individual component 300.

[0111] Here, for example, the protective member 400 may be formed as at least a portion of the outer surface of the individual component 300, and / or formed by coating at least a portion of the outer surface of the individual component 300. For example, the protective member 400 may be disposed on the outer surface of the individual component 300 in an area wider than the band 200, but the size and / or area of ​​the protective member 400 are not limited thereto.

[0112] In this way, the battery module 1000 according to an embodiment of the present invention can prevent the shape of the cell assembly 300 and / or the battery cell 100 included in the cell assembly 300 from being deformed due to the strip 200.

[0113] Figure 5 This is a schematic perspective view of a battery module according to an embodiment of the present invention.

[0114] According to one embodiment of the invention, the band 200 includes: a pair of short sides 200s covering at least a portion of a pair of cover plates; and a pair of long sides 200l covering at least a portion of the wide sides and connected to the pair of short sides 200s.

[0115] For example, when viewed from above, the strip 200 can be formed in a "mouth" shape. In this case, the strip 200 can have inner surfaces on each side of the "mouth" shape facing the outer surface of the monomer assembly 300. Alternatively, for example, when viewed from above, the strip 200 can be formed in a circular, elliptical, or irregular shape. In this case, the strip 200 can be formed in a shape that is the same as or similar to the "mouth" shape by surrounding the monomer assembly 300 and conforming to the outer surface of the monomer assembly 300.

[0116] For example, the belt 200 includes a pair of short sides 200s and a pair of long sides 200l. Here, the pair of short sides 200s can be formed facing each other. Here, the pair of long sides 200l can be formed facing each other. Here, one long side 200l can connect one side of one short side 200s to one side of the other short side 200s. Here, the other long side 200l can connect the other side of one short side 200s to the other side of the other short side 200s.

[0117] The short side 200s surrounds one of the sides of the cell assembly 300. For example, as described above, the cell assembly 300 is formed by arranging a plurality of battery cells 100 in parallel. Therefore, the cover 130 included in the plurality of battery cells 100 is exposed at a pair of opposing sides of the cell assembly 300. The short side 200s includes the area of ​​the cover 130 covered by the band 200.

[0118] A long side 200l surrounds one of the sides of the cell assembly 300. For example, as described above, the cell assembly 300 is formed by arranging a plurality of battery cells 100 in parallel. Therefore, at least two of the plurality of battery cells 100 respectively form the front side and the rear side of the cell assembly 300. For example, one wide side of the plurality of battery cells 100 forms the front side of the cell assembly 300. For example, another wide side of the plurality of battery cells 100 forms the rear side of the cell assembly 300. Here, the front and rear sides of the cell assembly 300 include surfaces positioned opposite each other in the xz plane. The long side 200l includes the area of ​​the strip 200 covering the wide side of the battery cell 100.

[0119] Since the area with the short side 200s covers the cover plate 130, the short side 200s can receive stress from the connecting piece 110. Therefore, the short side 200s needs to be designed to have higher strength than the area with the long side 200l.

[0120] Therefore, the short side 200s can be formed relatively thick. For example, the thickness ds of the short side 200s is formed to be equal to or greater than the thickness dl of the long side 200l. For example, the thickness ds of the short side 200s can be formed to be 1 to 4 times the thickness dl of the long side 200l. Optionally, for example, the thickness ds of the short side 200s can be formed to be 1.2 to 3.5 times the thickness dl of the long side 200l. Optionally, for example, the thickness ds of the short side 200s can be formed to be 1.4 to 3 times the thickness dl of the long side 200l. Optionally, for example, the thickness ds of the short side 200s can be formed to be 1.5 to 2.5 times the thickness dl of the long side 200l.

[0121] Therefore, considering the structure of the individual component 300, the strip 200 can apply pressure to the individual component 300 uniformly. In the following text, examples of various structures will be described with reference to the connector 110.

[0122] Figure 6A and Figure 6B A strip is schematically shown according to an embodiment of the present invention.

[0123] Figure 6A It is along Figure 5 The sectional view of A-A' in the diagram, and Figure 6B It is along Figure 5 The cross-sectional view of B-B' in the diagram.

[0124] like Figure 5 As shown, the belt 200 according to an embodiment of the present invention includes a short side 200s and a long side 200l. The short side includes: a central portion 220 comprising a first material; and an edge portion 230 comprising a second material with a breaking strength less than that of the first material and surrounding the central portion 220.

[0125] The central portion 220 is the interior of the band 200. For example, the central portion 220 is the portion that is not exposed to the outside of the band 200. The central portion 220 contains a first material. The first material is a material with relatively high fracture strength.

[0126] Edge portion 230 is the outer side of band 200. For example, edge portion 230 is the portion exposed to the outer side of band 200. For example, edge portion 230 is the portion disposed outside the central portion 220. Edge portion 230 includes a second material. The second material is a material with relatively low fracture strength, and for example, the fracture strength of the second material is equal to or lower than the fracture strength of the first material.

[0127] Here, the central portion 220 can be formed by molding processes such as compression molding, extrusion molding, injection molding, blow molding, and vacuum forming. The edge portion 230 can be formed by molding processes such as compression molding, extrusion molding, injection molding, blow molding, and vacuum forming. Alternatively, the edge portion 230 can be formed by coating the central portion 220.

[0128] Optionally, the edge portion 230 can be formed to have through holes using molding processes such as compression molding, extrusion molding, injection molding, blow molding, or vacuum forming. The central portion 220 can be formed using molding processes such as compression molding, extrusion molding, injection molding, blow molding, and vacuum forming. Optionally, the central portion 220 can be formed by injection into the through holes formed in the edge portion 230.

[0129] Here, the elongated side 200l may include a second material. That is, the elongated side 200l may be formed of the same material as the edge portion 230.

[0130] Here, the fracture strength of both the first and second materials is 50 MPa or higher. Therefore, the fracture strength of the second material can be 50 MPa or higher, and the fracture strength of the first material can be equal to or higher than the fracture strength of the second material.

[0131] Due to this structure, the short side 200s of the belt is formed to have a higher fracture strength than the long side 220l of the belt. Therefore, the belt 200 according to an embodiment of the present invention can improve the durability of the belt 200 and provide uniform pressure to the monolithic assembly 300.

[0132] Figure 7A and Figure 7B A strip according to an embodiment of the present invention is illustrated schematically, and Figure 7A and Figure 7B They are respectively with Figure 6A and Figure 6B The corresponding sectional view.

[0133] like Figure 5 As shown, the strip 200 according to an embodiment of the present invention includes a short side 200s and a long side 200l. The short side 200s includes: an inner portion 240, comprising a first material and facing the monolithic assembly 300; and an outer portion 250, comprising a second material having a fracture strength lower than that of the first material and located outside the inner portion 240.

[0134] The inner portion 240 is the inner side of the band 200. For example, the inner portion 240 is the portion of the band 200 facing the monolithic assembly 300. The inner portion 240 includes a first material. The first material is a material with relatively high tensile strength.

[0135] The outer portion 250 is the outer side of the band 200. For example, the outer portion 250 is the portion of the band 200 facing in the direction opposite to that of the monomer assembly 300. The outer portion 250 includes a second material. The second material is a material with a relatively low fracture strength, and the fracture strength of the second material is equal to or lower than that of the first material.

[0136] Here, the inner portion 240 can be formed using molding processes such as compression molding, extrusion molding, injection molding, blow molding, and vacuum forming. The outer portion 250 can also be formed using molding processes such as compression molding, extrusion molding, injection molding, blow molding, and vacuum forming. The outer portion 250 can be stacked on top of the inner portion 240. For example, the outer portion 250 can be fixed to the inner portion 240 using an adhesive material. Alternatively, the outer portion 250 can be formed by coating the inner portion 240.

[0137] Additionally, the adhesive material may include an adhesive substance. For example, the adhesive substance may include at least one of silicone resins, acrylic resins, urethane resins, rubber resins, epoxy resins, polyolefins, and combinations thereof.

[0138] For example, acrylic resins may include acryloyl, ester copolymers, ethyl acrylate, butyl acrylate, hexyl acrylate, n-octyl acrylate, isooctyl acrylate, 2-ethylhexyl acrylate, isononyl acrylate, lauryl acrylate, acrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, acrylonitrile, acryloylmorpholine, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, etc.

[0139] For example, urethane resins can include, for example, polyurethane.

[0140] For example, rubber-based resins can include natural rubber, synthetic rubber, etc.

[0141] Here, the elongated side 200l may include a second material. That is, the elongated side 200l may be formed of the same material as the outer portion 250.

[0142] Here, the fracture strength of both the first and second materials is 50 MPa or higher. Therefore, the fracture strength of the second material can be 50 MPa or higher, and the fracture strength of the first material can be equal to or higher than the fracture strength of the second material.

[0143] Due to this structure, the short side 200s of the belt is formed to have a higher fracture strength than the long side 220l of the belt. Therefore, the belt 200 according to an embodiment of the present invention can improve the durability of the belt 200 and provide uniform pressure to the monolithic assembly 300.

[0144] Figure 8 A strip is schematically shown according to an embodiment of the present invention.

[0145] like Figure 5 As shown, the strip 200 according to an embodiment of the present invention includes a short side 200s and a long side 200l. The strip 200 may also include a hole 210 formed in the short side 200s and through which a pair of tabs 110 pass.

[0146] Hole 210 is formed through the short side 200s. Hole 210 allows the terminal piece 110 to pass through the short side 200s and be exposed to the outside.

[0147] The hole 210 may be formed corresponding to the size and / or shape of the terminal piece 110. For example, the terminal piece 110 may be formed in a rectangular shape, and in this case, the hole 210 may be formed in a rectangular shape corresponding to the shape of the terminal piece 110. Alternatively, for example, the terminal piece 110 may be formed in a thin plate shape, and in this case, the hole 210 may be formed in a slit shape through which the terminal piece 110 can pass. Alternatively, since the hole 210 may be formed to be approximately larger than the size of the terminal piece 110, the terminal piece 110 may pass through the hole 210 while the band 200 can uniformly pressurize the individual assembly 300.

[0148] For example, such as Figure 8 As shown, when the battery module 1000 is viewed in the yz plane, the area of ​​the hole 210 can be formed to be 1.01 to 2.00 times the area of ​​the terminal piece 110. Optionally, for example, the area of ​​the hole 210 can be formed to be 1.01 to 1.99 times the area of ​​the terminal piece 110. Optionally, the area of ​​the hole 210 can be formed to be 1.10 to 1.90 times the area of ​​the terminal piece 110.

[0149] Therefore, according to one embodiment of the invention, the band 200 can pressurize the cell assembly 300 while covering the cover plate 130 formed by the protruding terminal piece 110. For example, even when the battery module 1000 includes a plurality of battery cells 100 having side terminal structures, a method of pressurizing the cell assembly 300 using the band 200 is provided.

[0150] In the following text, examples will be described that prevent the belt 200 from reducing the pressure on the individual component 300 or from applying uneven pressure to the individual component 300, and / or improve the durability of the belt 200, even when the belt 200 includes the hole 210.

[0151] Figure 9 A strip is schematically shown according to an embodiment of the present invention.

[0152] like Figure 9 As shown, for example, in the area with short side 200s, the area where the hole 210 is formed can be formed higher than the area where the hole 210 is not formed.

[0153] Optionally, for example, in the case of the short side 200s, the height d2 of the adjacent portion 202 of the hole 210 can be formed to be longer than the height d1 of the non-adjacent portion 201 of the hole 210, although in Figure 9 Not shown in the image.

[0154] The short side 200s includes a hole-adjacent portion 202 and a hole-non-adjacent portion 201.

[0155] The adjacent portion 202 of the hole is the area in the belt 200 in which the hole 210 is located in the height direction Z. For example, the adjacent portion 202 of the hole includes the areas in the belt 200 corresponding to the portions above and below the hole 210. Here, the adjacent portion 202 of the hole may also include the areas to the left and / or right of the hole 210 in the belt 200. The non-adjacent portion 201 of the hole is the area in the belt 200 in which the hole 210 is not located in the height direction Z.

[0156] When the hole 210 is formed in the belt 200, the height of the portions above and below the area where the hole 210 is formed becomes thinner. The durability and pressure resistance can differ between the adjacent portions 202 and the non-adjacent portions 201 of the hole in the belt 200.

[0157] Therefore, the total height d2 of the adjacent portions 202 of the hole can be made longer than the height d1 of the non-adjacent portions 201 of the hole.

[0158] Due to this structure, the battery module 1000 can improve the durability of the strip 200 in which the holes 210 are formed, and / or the strip 200 can provide uniform pressure to the single-cell assembly 300.

[0159] Figure 10 A strip is schematically shown according to an embodiment of the present invention.

[0160] like Figure 10 As shown, for example, the short side 200s may also include a terminating member 260 located near the hole 210.

[0161] The termination member 260 prevents force from being applied to the strip 200 located near the terminal piece 110, or the termination member 260 disperses any such force. Alternatively, for example, the termination member 260 prevents the pressure on the strip 200 from being reduced due to the hole 210.

[0162] For this purpose, the termination member 260 is formed adjacent to the hole 210. For example, the termination member 260 is formed on at least one of the upper, lower, left and right sides of the terminal piece 110 passing through the hole 210.

[0163] For example, the termination member 260 is manufactured by molding. In this case, the termination member 260 can be engaged with the hole 210 and fixed to the belt 200. Alternatively, the termination member 260 can be formed by coating onto the belt 200 adjacent to the hole 210. Alternatively, the termination member 260 can be formed by adhering to the belt adjacent to the hole 210.

[0164] For example, the termination member 260 includes one or more selected from the group consisting of rubber, polymer resin, metal, and combinations thereof. Here, when the termination member 260 is formed by adhering to the strip 200 adjacent to the hole 210, the termination member 260 may also include an adhesive material for adhering the termination member 260 to the strip 200.

[0165] Due to this structure, the battery module 1000 can improve the durability of the strip 200 in which the holes 210 are formed.

[0166] exist Figures 8 to 10 The diagram illustrates an example of a hole 210 formed in the short side 200s of the belt 200 and a termination member 260 for reinforcing the strength of the hole 210. However, the belt 200 according to one embodiment of the invention is not limited to... Figures 8 to 10 The construction shown.

[0167] For example, Figures 5 to 7B At least one of the examples shown can be applied to the short side 200s of the strip with the hole 210 formed. For example, the short side 200s of the strip with the hole 210 formed can be formed to be thicker than the long side 200l of the strip. Optionally, for example, the short side 200s of the strip with the hole 210 formed can include a central portion containing a first material and an edge portion containing a second material. Optionally, for example, the short side 200s of the strip with the hole 210 formed can include an inner portion containing a first material and an outer portion containing a second material.

[0168] In addition, they can be combined and applied. Figures 5 to 7B At least one of the examples shown and Figures 8 to 10At least one of the examples shown. For example, the short side 200s in which the hole 210 is formed may include: a central portion containing a first material; an edge portion containing a second material; and a terminating member located near the hole.

[0169] In addition, it can be combined and applied. Figures 5 to 10 At least two of the examples shown. For example, in belt 200, the thickness of the short side 200s is formed to be thicker than the thickness of the long side 200l, and the short side 200s may include a central portion containing a first material and an edge portion containing a second material.

[0170] Because of this structure, a battery module 1000 according to an embodiment of the present invention can provide a method for maintaining uniform pressure even when the pressure changes due to expansion.

[0171] Although the invention has been described with reference to limited embodiments and accompanying drawings, it is not limited thereto, and it will be apparent to those skilled in the art that various modifications and variations can be made within the scope of the technical concept and the equivalents of the claims.

Claims

1. A battery module, the battery module comprising: A single cell assembly includes multiple battery cells; as well as The belt, comprising an elastic material, wraps around the monolithic assembly while pressure is applied. Each of the plurality of battery cells includes: Casing; and A pair of terminals extend from at least one side of the housing and pass through the strip.

2. The battery module of claim 1, wherein, The housing includes: a pair of narrow sides facing each other; and a pair of wide sides connecting the pair of narrow sides. The battery cell includes a pair of cover plates and has a pair of protruding terminals, the pair of cover plates being connected to a first opening formed on one side of the housing and a second opening formed on the other side of the housing.

3. The battery module of claim 2, wherein, The strip includes: a pair of short sides covering at least a portion of the pair of cover plates; and A pair of long sides, covering at least a portion of the wide side and connected to the pair of short sides.

4. The battery module of claim 3, wherein, The short side of the strip is formed to be thicker than the long side of the strip.

5. The battery module according to claim 3, wherein, The short side portion includes: a central portion comprising a first material; and The edge portion includes a second material and surrounds the central portion, wherein the fracture strength of the second material is lower than that of the first material.

6. The battery module of claim 3, wherein, The short side includes: an internal portion comprising a first material and facing the monolithic assembly; and The outer portion includes a second material and is located outside the inner portion, wherein the fracture strength of the second material is lower than that of the first material.

7. The battery module of claim 3, wherein, The strip includes a hole formed in the short side of the strip and the pair of tabs pass through the hole.

8. The battery module of claim 7, wherein, In the short side of the belt, the area where the hole is formed is higher than the area where the hole is not formed.

9. The battery module of claim 7, wherein, The short side of the band also includes a termination member located near the hole.

10. The battery module of claim 7, wherein, In the short side of the belt, the height of the adjacent portion of the hole is formed to be longer than the height of the non-adjacent portion of the hole.

11. The battery module of claim 1, wherein, The strip is formed to have a height of 40% or greater than that of the monolithic component.

12. The battery module of claim 1, wherein, The belt includes at least one selected from the group consisting of rubber, polymer resin, metal and combinations thereof.

13. The battery module of claim 1, wherein, The belt has a breaking strength of 50 MPa or greater.

14. The battery module according to claim 1, the battery module further comprising a protective member located between the cell assembly and the strip and applying pressure to the cell assembly.

15. The battery module of claim 14, wherein, The protective component has a bending strength of 200 MPa or greater.

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