Battery pack

Abstract

A battery pack includes a case, a plurality of battery cells accommodated in the case, a bus bar electrically connecting the plurality of battery cells, a shell mounted on the case and supporting the battery cells among the plurality of battery cells, a first space between the battery cells and the shell to discharge gas, and a second space between the shell and the case. According to the present invention, the first space is formed between the battery cells and the shell, the second space is formed between the shell and the case, and the shell is ruptured by gas pressure of the battery cells to stably discharge gas.

Description

Technical Field

[0001] The embodiments of this disclosure relate to battery packs. Background Technology

[0002] Generally speaking, with the rapid growth in demand for portable electronic products (such as laptops, cameras, and mobile phones) and the formal commencement of commercialization of robots, electric vehicles, etc., research is actively underway on high-performance rechargeable and dischargeable batteries. In particular, lithium rechargeable batteries are widely used as power sources for various electronic products due to their high energy density and operating voltage, as well as excellent storage and lifespan characteristics.

[0003] A lithium secondary battery is a battery that includes an electrolyte and positive and negative electrodes containing active materials capable of inserting and deintercalating lithium ions. When lithium ions are inserted into the positive electrode and deintercalated from the negative electrode, the lithium secondary battery generates electrical energy through oxidation and reduction reactions.

[0004] The information disclosed in the background section of this disclosure is provided to enhance understanding of the background of this disclosure and may include information that does not constitute related technology. Summary of the Invention

[0005] According to one aspect of the present invention, a battery pack is provided that can reduce gas emission resistance caused by the combustion of individual battery cells.

[0006] However, the aspects of this disclosure and the technical problems to be solved are not limited to those described above, and those skilled in the art will clearly understand from the following description of the invention that is disclosed that there are other aspects and problems not mentioned.

[0007] According to one or more embodiments of the present invention, a battery pack includes: a housing; a plurality of battery cells housed in the housing; a busbar electrically connecting the plurality of battery cells; a shell mounted on the housing and supporting the battery cells among the plurality of battery cells; a first space between the battery cells and the housing for venting gas; and a second space between the shells.

[0008] The housing may include: a housing body; a housing cover covering the open portion of the housing body; and a housing frame on the housing body to guide the installation of the housing.

[0009] The casing may include: a casing base portion supported by the casing; and a casing support portion connected to the casing base portion and supporting the battery cell.

[0010] The shell base portion may include: a base sitting portion, sitting on the shell; and a base protrusion, protruding from the base sitting portion in a first direction.

[0011] The housing support may include: a support side cover connected to the housing base and covering the rows of battery cells; a support protrusion connected to the support side cover and supporting the lower portion of the rows of battery cells; and a support plate coupled to the support protrusion, spaced apart from the battery cells, and ruptureable to release gases emitted from the battery cells.

[0012] The vent of a single battery cell can be located inside the support protrusion.

[0013] The thickness of the supporting protrusion can be greater than the thickness of the first space.

[0014] The support protrusions can support the battery cells arranged in a row.

[0015] The support protrusion may include: a protrusion plate connected to a support side cover; and a protrusion ring on the protrusion plate, wherein a support plate is formed inside the protrusion ring, the protrusion ring supporting the lower portion of each of the battery cells arranged in multiple rows.

[0016] The support protrusion may further include one or more protrusion grooves formed in the protrusion plate, positioned along the periphery of the protrusion ring, and configured to allow gas inflow and outflow.

[0017] The raised grooves can be arranged in the perimeter direction at a range of 45 degrees to 360 degrees.

[0018] The support plate may include: a plate cover portion, which is attached to the support protrusion and spaced apart from the battery cell; and a plate vent portion, formed in the plate cover portion, located in the gas venting region of the battery cell, and configured to rupture due to gas pressure to vent gas.

[0019] The thickness of the plate covering part can be greater than the thickness of the plate exhaust part.

[0020] The plate exhaust section can be formed into any shape, such as a cross shape, a concentric circle shape, a spoke shape, or a grid pattern shape.

[0021] The battery pack may further include a fire suppression unit located in at least one of the first and second spaces and configured to suppress combustion of the battery cells.

[0022] The fire extinguishing unit may include: a fire extinguishing disc, which includes a fire extinguishing agent; and a fire extinguishing belt, which is on the fire extinguishing disc.

[0023] The thickness of a fire extinguishing sheet can be greater than that of a fire hose.

[0024] The fire extinguishing disc may include: a disc body, to which a fire extinguishing belt is attached; and multiple disc capsules embedded in the disc body and containing a fire extinguishing agent.

[0025] The main body of the film can be formed by mixing epoxy resin and additives.

[0026] The content ratio of the plurality of capsules can be 30% to 50%.

[0027] According to another aspect of this disclosure, a battery pack with an improved structure and a vehicle including the battery pack are provided. The battery pack may include: a housing; a plurality of battery cells housed in the housing; a busbar electrically connecting the plurality of battery cells; a shell mounted on the housing and supporting the battery cells among the plurality of battery cells; a first space between the battery cells and the housing for venting gases; and a second space between the shells. Attached Figure Description

[0028] The accompanying drawings illustrate some embodiments of the invention and are provided together with the detailed description of the invention below to facilitate understanding of the technical concept of the invention; however, the invention is not to be construed as limited to the matters shown in the drawings, in which:

[0029] Figure 1 This is a perspective view schematically showing a battery pack according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic view illustrating the connection relationship between battery cells and busbars in a battery pack according to an embodiment of the present invention;

[0031] Figure 3 This is a schematic cross-sectional view showing the state in which battery cells are arranged in a battery pack according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic perspective view of a battery cell according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic cross-sectional view of a battery cell according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic view of the housing according to an embodiment of the present invention;

[0035] Figure 7 This is a schematic plan view of the shell according to an embodiment of the present invention;

[0036] Figure 8 This is a schematic cross-sectional view of the shell according to an embodiment of the present invention;

[0037] Figure 9 This is an enlarged view of the main part of the shell according to an embodiment of the present invention;

[0038] Figure 10 This is a schematic plan view of a support plate according to an embodiment of the present invention;

[0039] Figure 11 This is a schematic plan view of a support plate according to another embodiment of the present invention;

[0040] Figure 12 This is a schematic plan view of a support plate according to another embodiment of the present invention;

[0041] Figure 13 This is a schematic plan view of a support plate according to another embodiment of the present invention;

[0042] Figure 14 This is a schematic view illustrating a support protrusion according to another embodiment of the invention;

[0043] Figure 15 This is a schematic view showing the state of the fire extinguishing unit according to an embodiment of the present invention;

[0044] Figure 16 This is a schematic side view of a fire extinguishing unit according to an embodiment of the present invention; and

[0045] Figure 17 This is a schematic view of a fire extinguishing disc according to an embodiment of the present invention. Detailed Implementation

[0046] Here, some embodiments of the invention will be described in further detail with reference to the accompanying drawings. The terms or words used in this specification and claims are not to be construed as having a general or dictionary meaning, but are to be interpreted as having meanings and concepts consistent with the technical spirit of this disclosure, based on the principle that the inventor can be his / her own lexicographer to appropriately define the concepts of the terms in order to best describe his / her invention. Therefore, the embodiments disclosed in this specification and the configurations shown in the accompanying drawings are merely some exemplary embodiments of this disclosure and do not necessarily represent the full technical spirit of this disclosure. It will be understood that various equivalents and modifications may exist to replace the exemplary embodiments at the time of filing this application.

[0047] Furthermore, when used in this specification, "comprising" or "including" and / or "including..." or "containing..." indicates the presence of the mentioned shape, quantity, step, operation, component, element and / or group thereof, and does not exclude the presence or addition of one or more other shapes, quantities, steps, operations, components, elements and / or groups thereof.

[0048] Furthermore, to facilitate understanding of this disclosure, the drawings may not be drawn to scale, and the dimensions of some components may be exaggerated. Additionally, the same reference numerals may be assigned to the same components in different embodiments.

[0049] The phrase "identical" to mean that two objects being compared are identical or substantially identical is used. Therefore, "identical" or "substantially identical" can include deviations considered low in the art, such as within 5%. Furthermore, uniformity of parameters in a region can mean uniformity from an average perspective.

[0050] Although terms such as "first," "second," etc., are used to describe various components, it will be understood that these components are not limited by these terms. These terms are used to distinguish one component from another, and unless otherwise stated, it will be understood that a first component can be a second component.

[0051] Throughout this instruction manual, unless otherwise stated, each component may be in the singular or plural.

[0052] Placing any component on the "upper part (or lower part)" of a component or "above (or below)" a component can mean not only that the arbitrary component is configured to contact the upper surface (or lower surface) of the component, but also that another component can be inserted between the component and the arbitrary component positioned above (or below) the component.

[0053] Furthermore, when it is disclosed that a component is “on” another component, “connected to” another component, or “joined to” another component, it will be understood that these components can be directly connected or joined to each other, or that another component can be “inserted” between these components, or that these components can be “connected,” “joined,” or “linked” through another component.

[0054] As used herein, the term "and / or" includes any one or more of the associated listed items and all combinations thereof. Furthermore, when describing embodiments of this disclosure, the use of "may" refers to "one or more embodiments of this disclosure." Terms such as "one or more" following the list of elements modify the entire list of elements, but not individual elements within the list.

[0055] Throughout this instruction manual, “A and / or B” means A, B, or A and B, unless otherwise stated, and “C to D” means greater than or equal to C and less than or equal to D, unless otherwise stated.

[0056] 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 consisting of A, B and C” or “at least one selected from A, B and C” are used to specify a list of elements A, B and C, the phrase may refer to any one of all suitable combinations.

[0057] The term “use” may be considered synonymous with the term “utilize”. As used in this specification, the terms “substantially,” “about,” and other similar terms are used as approximations rather than terms of degree and are intended to take into account the inherent variations in measured or calculated values ​​that will be recognized by those skilled in the art.

[0058] Although the terms “first,” “second,” “third,” etc., may be used in this specification to describe various elements, components, regions, layers, and / or sections, these elements, components, regions, layers, and / or sections shall not be limited by these terms. These terms are used to distinguish one element, component, region, layer, or section from another element, component, region, layer, or section. Therefore, the first element, component, region, layer, or section described below may be referred to as the second element, component, region, layer, or section without departing from the teachings of this disclosure.

[0059] The use of spatial relational terms such as "below," "under," "down," "above," and "above" is for the purpose of readily describing the relationship between one element or feature and another element or feature shown in the accompanying drawings. These spatial relational terms are provided to facilitate understanding of this disclosure according to its various states of manufacture or use, and are not intended to limit the disclosure. For example, when elements or features in the drawings are reversed, elements described as "below" or "under" become "above" or "above." Therefore, "below" encompasses the concepts of "above" and "below."

[0060] The terminology used in this specification is intended to describe embodiments of this disclosure and is not intended to limit this disclosure.

[0061] Figure 1 This is a schematic perspective view of a battery pack according to an embodiment of the present invention. Figure 2 This is a schematic view illustrating the connection relationship between battery cells and busbars in a battery pack according to an embodiment of the present invention. Figure 3 This is a schematic cross-sectional view showing the arrangement of individual battery cells in a battery pack according to an embodiment of the present invention. (Refer to...) Figures 1 to 3 According to an embodiment of the present invention, the battery pack includes a housing 1, a battery cell 2, a busbar 3, a casing 4, a first space 5, and a second space 6.

[0062] The housing 1 typically forms the appearance of the battery pack and provides space therein to accommodate individual battery cells 2.

[0063] The battery cell 2 can be used as a unit structure in the battery pack for storing and supplying electricity.

[0064] Multiple battery cells 2 can be provided. These multiple battery cells 2 can be arranged inside the housing 1 to form any pattern of various designs, such as grid patterns, sawtooth patterns, etc. The multiple battery cells 2 can be arranged parallel to each other. The number of battery cells 2 can vary in various ways depending on the size, shape, etc., of the housing 1. The configuration of the secondary battery will be described below.

[0065] The busbar 3 can electrically connect multiple battery cells 2 to each other. Multiple battery cells 2 can be connected in series or parallel via the busbar 3. For example, in the housing 1, the busbar 3 can connect battery cells 2 arranged in the same row in parallel, and connect battery cells 2 arranged in adjacent rows in series. The busbar 3 can be formed of a conductive material (such as copper, aluminum, nickel, etc.).

[0066] According to the embodiment, the busbar 3 may include a main busbar 910, a first branch busbar 920, and a second branch busbar 930.

[0067] The main busbar 910 can be disposed between adjacent rows of battery cells 2. Multiple main busbars 910 can be provided. The main busbars 910 can extend in a straight line between rows of battery cells 2, or can be regularly curved in a zigzag shape. Multiple main busbars 910 can be disposed separately between different adjacent rows of battery cells 2. Multiple main busbars 910 can be electrically connected to each other.

[0068] The first branch busbar 920 can extend from the main busbar 910 to the terminal 400 of the battery cell 2 as described below. The first branch busbar 920 can be mechanically connected and electrically connected to the terminal 400 by means of laser welding, ultrasonic welding, etc. Multiple first branch busbars 920 can be provided. Multiple first branch busbars 920 can be connected to different terminals 400 respectively.

[0069] The second branch busbar 930 can extend from the main busbar 910 to the cell cover 200 of the battery cell 2 as described below. The second branch busbar 930 can be mechanically connected and electrically connected to the cell cover 200 by means of laser welding, ultrasonic welding, etc. Multiple second branch busbars 930 can be provided. Multiple second branch busbars 930 can be connected to the cell cover 200 of different battery cells 2 respectively.

[0070] The casing 4 can be mounted on the casing 1 and can support the battery cell 2. The casing 4 can support the battery cell 2, so that the casing 1 and the battery cell 2 are spaced apart from each other.

[0071] A first space 5 is formed between the battery cell 2 and the casing 4, and provides space for venting gas. The edge of the battery cell 2 sits on the casing 4, and the space between the lower part of the battery cell 2 and the casing 4 can be the first space 5. Venting of the battery cell 2 can be easily performed through the first space 5, and gas can be vented stably.

[0072] The second space 6 can be formed between the shell 4 and the housing 1, and can provide space for venting gas. If the shell 4 ruptures due to gas emitted from the explosion of the battery cell 2, the gas passing through the shell 4 can flow into the second space 6.

[0073] Figure 4 This is a perspective view schematically showing a battery cell according to an embodiment of the present invention. Figure 5 This is a schematic cross-sectional view of a battery cell according to an embodiment of the present invention.

[0074] According to the embodiments, the battery cell 2 may include an electrode assembly 100, a cell cover 200, a cover plate 300 and a terminal 400, and may further include a first current collector 500.

[0075] Here, an example of a cylindrical lithium-ion secondary battery will be described. However, the invention is not limited thereto; for example, the battery cell 2 may be a lithium polymer battery or a prismatic battery.

[0076] The electrode assembly 100 can be used as a unit structure in the battery cell 2 to perform charging and discharging operations.

[0077] The electrode assembly 100 may include a first electrode plate 110, a second electrode plate 120, and a diaphragm 130 disposed between the first electrode plate 110 and the second electrode plate 120.

[0078] In one embodiment, the electrode assembly 100 may have a shape that is wound around a winding axis C.

[0079] In an embodiment, the electrode assembly 100 may have a shape in which it is wound clockwise or counterclockwise around a winding axis C in a stacked state of the first electrode plate 110, the diaphragm 130, and the second electrode plate 120. Therefore, the electrode assembly 100 can generally have a jelly roll shape. The cross-section of the electrode assembly 100 can have any shape other than a circular shape, such as an elliptical shape, a polygonal shape, etc. Here, the winding axis C can refer to a straight line passing through the center of the electrode assembly 100.

[0080] The first electrode plate 110 may serve as the positive electrode of the electrode assembly 100. The first electrode plate 110 may be in the form of a foil comprising a metallic material (such as aluminum or an aluminum alloy). The type, size, shape, etc. of the first electrode plate 110 are not particularly limited, as long as it has electrical conductivity and does not cause chemical changes in the secondary battery.

[0081] At least a portion of the first electrode plate 110 may be coated with a first active material layer. Both surfaces or opposite surfaces of the first electrode plate 110 may be coated with the first active material layer, or only one surface of the first electrode plate 110 may be coated with the first active material layer.

[0082] In an embodiment, the first electrode plate 110 serves as a positive electrode, and the first active material layer may include a positive electrode active material.

[0083] The positive electrode active material may be a compound (lithiated intercalation compound) capable of reversibly intercalating and deintercalating lithium. In an embodiment, one or more selected from composite oxides of lithium and metals selected from cobalt, manganese, nickel, iron, and combinations thereof may be used as the positive electrode active material.

[0084] In an example, the positive electrode active material may include at least one of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNi x Co y Mn z O2, NCM). Here, 0<x<1, 0<y<1, 0<z<1, and x+y+z=1 may be satisfied. In an embodiment, the positive electrode active material may include only one of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNi x Co y Mn z O2, NCM), or may include any two or all three of lithium-iron-phosphorus oxide (LiFePO4, LFP), lithium-manganese-iron-phosphorus oxide (LiMnFePO4, LMFP), and lithium-nickel-cobalt-manganese oxide (LiNi x Co y Mn z O2, NCM).

[0085] The first active material layer may further include a positive electrode conductive material.

[0086] The positive electrode conductive material imparts electrical conductivity to the first active material layer, and any suitable conductive material that does not cause chemical change can be used. Examples of positive electrode conductive materials may include: carbon-based materials, such as natural graphite, artificial graphite, carbon black, acetylene black, Ketjen black, carbon fibers, carbon nanofibers, and carbon nanotubes; metal-based materials containing copper, nickel, aluminum, silver, etc., in the form of metal powders or metal fibers; conductive polymers, such as polyphenylene derivatives; or mixtures thereof.

[0087] In one embodiment, the first active material layer may further include a positive electrode binder.

[0088] The positive electrode binder binds the particles constituting the positive electrode active material well to each other, and also binds the positive electrode active material well to the first electrode plate 110.

[0089] Examples of positive electrode adhesives may include non-aqueous adhesives, aqueous adhesives, dry adhesives, or combinations thereof.

[0090] 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.

[0091] In embodiments, the aqueous adhesive may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, polyethylene oxide, polyvinylpyrrolidone, polyepoxychlorohydrin, 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.

[0092] If an aqueous binder is used as the positive electrode binder, a cellulose compound can be further incorporated to impart viscosity. This cellulose compound can be used by mixing carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and one or more of their alkali metal salts. In embodiments, Na, K, or Li can be used as the alkali metal.

[0093] Dry binders can be fibrous polymeric materials, such as polytetrafluoroethylene, polyvinylidene fluoride, polyvinylidene fluoride-hexafluoropropylene copolymer, polyethylene oxide, or combinations thereof.

[0094] The first electrode plate 110 may include a first uncoated portion 111 thereon to which the first active material layer is not applied. The first uncoated portion 111 may protrude a distance (e.g., a predetermined distance) at an end portion of the electrode assembly 100 along the winding axis C.

[0095] The second electrode plate 120 may serve as the negative electrode of the electrode assembly 100. The second electrode plate 120 may be formed in the form of a foil comprising a metallic material such as copper, a copper alloy, nickel, or a nickel alloy. The second electrode plate 120 may be arranged to face the first electrode plate 110 at a distance (e.g., a predetermined distance) from the first electrode plate 110.

[0096] The type, size, shape, etc. of the second electrode plate 120 are not particularly limited, as long as it has electrical conductivity and does not cause chemical changes in the secondary battery.

[0097] At least a portion of the second electrode plate 120 may be coated with a second active material layer. Both surfaces or opposite surfaces of the second electrode plate 120 may be coated with the second active material layer, or only one surface of the second electrode plate 120 may be coated with the second active material layer.

[0098] In an embodiment, the second electrode plate 120 serves as the negative electrode, and the second active material layer may include a negative electrode active material.

[0099] The negative electrode active material includes a material capable of reversibly intercalating / deintercalating lithium ions, lithium metal, a lithium alloy, a material capable of doping and dedoping lithium, or a transition metal oxide.

[0100] 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 the crystalline carbon may include graphite, such as plate-like, flake-like, spherical or fibrous natural graphite or artificial graphite, and examples of the amorphous carbon may include soft carbon or hard carbon, mesophase pitch carbide, calcined coke, and the like.

[0101] In an 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 may be used as the lithium alloy.

[0102] In an embodiment, as the material capable of doping and dedoping lithium, a Si-based negative electrode active material or a Sn-based negative electrode active material may be used. The Si-based negative electrode active material may include silicon, a silicon-carbon composite, SiO x (0<x≤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 may include Sn, SnO₂, a Sn-based alloy, or a combination thereof.

[0103] The silicon-carbon composite can be a composite of silicon and amorphous carbon. According to embodiments, the silicon-carbon composite can be in the form of silicon particles with amorphous carbon coated on their surface. For example, the silicon-carbon composite can include secondary particles (cores) formed by an aggregation of primary silicon particles and an amorphous carbon coating layer (shell) located on the surface of the secondary particles. The amorphous carbon can also be located between the primary silicon particles, such that, for example, the primary silicon particles can be coated with amorphous carbon. The secondary particles can be present by dispersion within an amorphous carbon matrix.

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

[0105] Si-based or Sn-based negative electrode active materials can be used in combination with carbon-based negative electrode active materials.

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

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

[0108] The negative electrode binder effectively attaches the negative electrode active material particles to each other and also effectively attaches the negative electrode active material to the second electrode plate 120.

[0109] Examples of negative electrode adhesives may include non-aqueous adhesives, aqueous adhesives, dry adhesives, or combinations thereof.

[0110] 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.

[0111] Waterborne adhesives may be selected from styrene-butadiene rubber, (meth)acrylated styrene-butadiene rubber, (meth)acrylonitrile-butadiene rubber, (meth)acrylic rubber, butyl rubber, fluoroelastomers, polyethylene oxide, polyvinylpyrrolidone, polyepoxygenated alcohol, polyphosphazene, poly(meth)acrylonitrile, ethylene propylene diene copolymer, polyvinylpyridine, chlorosulfonated polyethylene, latex, polyester resin, (meth)acrylic resin, phenolic resin, epoxy resin, polyvinyl alcohol, and combinations thereof.

[0112] If an aqueous binder is used as the negative electrode binder, it can be further incorporated with a cellulose compound to impart viscosity. This cellulose compound can be used by mixing carboxymethyl cellulose, hydroxypropyl methyl cellulose, methyl cellulose, and one or more of their alkali metal salts. In embodiments, Na, K, or Li can be used as the alkali metal.

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

[0114] The second electrode plate 120 may include a second uncoated portion 121 that is not coated with the second active material layer. The second uncoated portion 121 may protrude by a distance (e.g., a predetermined distance) along the winding axis C at the other end of the electrode assembly 100 located on the opposite side of the first uncoated portion 111.

[0115] A diaphragm 130 may be disposed between the first electrode plate 110 and the second electrode plate 120. The diaphragm 130 may prevent or substantially prevent short circuits between the first electrode plate 110 and the second electrode plate 120 while allowing lithium ions to move between them.

[0116] As the separator 130, polyethylene, polypropylene, polyvinylidene fluoride, or multilayer membranes of two or more layers thereof can be used, or mixed multilayer membranes such as polyethylene / polypropylene two-layer separators, polyethylene / polypropylene / polyethylene three-layer separators, polypropylene / polyethylene / polypropylene three-layer separators, etc. can be used.

[0117] The diaphragm 130 may include a porous substrate and a coating layer located on one or both or opposite surfaces of the porous substrate, the coating layer comprising an organic material, an inorganic material, or a combination thereof.

[0118] The porous substrate can be a polymer film formed from polymers 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 oxide, cyclic olefin copolymers, polyphenylene sulfide, polyethylene naphthalate, glass fiber, polytetrafluoroethylene (e.g., Teflon), and copolymers or mixtures thereof.

[0119] Organic materials may include polyvinylidene fluoride polymers or (meth)acrylamide polymers.

[0120] 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.

[0121] Organic and inorganic materials can exist as a mixture in a single coating layer, or they can exist as a stack of coating layers including organic materials and coating layers including inorganic materials.

[0122] In one embodiment, the diaphragms 130 may be provided in a pair. The pair of diaphragms 130 may be configured to face two surfaces or opposite surfaces of the first electrode plate 110 or the second electrode plate 120 respectively. The pair of diaphragms 130 may be wound together with the first electrode plate 110 and the second electrode plate 120 around the winding axis C.

[0123] The cell cover 200 generally forms the appearance of the battery cell 2 and houses the electrode assembly 100. In embodiments, the cell cover 200 may be made conductive. For example, the cell cover 200 may comprise at least one material selected from steel, stainless steel, aluminum, and aluminum alloys.

[0124] The single-piece cover 200 may include a can 201, an open portion 202, and a closed portion 203.

[0125] In one embodiment, the can 201 may have a cylindrical shape with a generally circular cross-section. The diameter of the can 201 may be larger than the diameter of the electrode assembly 100. The length of the can 201 parallel to the winding axis C of the electrode assembly 100 may be greater than the length of the electrode assembly 100.

[0126] The electrode assembly 100 can be housed in a container 201. In one embodiment, the central axis of the container 201 can be configured to be coaxial with the winding axis C of the electrode assembly 100.

[0127] The open portion 202 and the closed portion 203 can be respectively disposed at two end portions or opposite end portions of the can 201. The open portion 202 and the closed portion 203 can be configured to be spaced apart from each other in a first direction. Here, the first direction described below can refer to a direction parallel to the central axis of the can 201 and the winding axis C of the electrode assembly 100. Figure 5 The direction from the open part 202 toward the closed part 203.

[0128] According to the embodiment, the open portion 202 can be formed with a hole passing through one end portion of the can 201. The two sides or opposite sides of the open portion 202 can be connected to the space inside the can 201 and the space outside the can 201, respectively. During the manufacturing process of the battery cell 2, the electrode assembly 100 can be inserted into the can 201 together with the electrolyte through the open portion 202.

[0129] According to an embodiment, the closure portion 203 can be formed in the shape of a disc disposed at the other end portion of the can 201 spaced apart from the open portion 202 in a first direction. In an embodiment, the outer peripheral surface of the closure portion 203 can be integrally formed with the inner peripheral surface of the can 201 to seal the other end portion of the can 201. For example, the can 201 and the closure portion 203 can be formed by a deep drawing process. In an embodiment, the closure portion 203 can be manufactured separately from the can 201, and the outer peripheral surface of the closure portion 203 can be joined to the inner peripheral surface of the can 201. A hole providing a path for the insertion of the terminal 400, which will be described below, can be formed in the central portion of the closure portion 203.

[0130] The first uncoated portion 111 of the electrode assembly 100 may be configured inside the can 201 to face the closed portion 203. The second uncoated portion 121 of the electrode assembly 100 may be configured inside the can 201 to face the open portion 202.

[0131] The single-piece cover 200 according to the embodiment may further include a beading portion 204.

[0132] The grooved portion 204 can refer to a portion of the can 201 that protrudes from the inner circumferential surface of the can 201 toward the central axis of the can 201. The grooved portion 204 can be formed by pressing the outer circumferential surface of the can 201 on the side adjacent to the open portion 202. The grooved portion 204 can contact the other end portion of the electrode assembly 100, at which the second uncoated portion 121 protrudes. Therefore, the grooved portion 204 can prevent the electrode assembly 100 from moving or separating from the interior of the can 201.

[0133] The cover plate 300 can be configured as the open portion 202 of the sealing unit cover 200.

[0134] According to the embodiment, the cover plate 300 can be formed to have a generally disc shape. The cover plate 300 can be disposed inside the can 201. The cover plate 300 can be disposed inside the can 201 facing the end portion of the electrode assembly 100, and the grooved portion 204 is inserted between the cover plate 300 and the end portion of the electrode assembly 100. One surface of the cover plate 300 can sit on the grooved portion 204. The other surface of the cover plate 300 can be configured to face the space outside the can 201.

[0135] A crimping portion 205 for securing the cover 300 may be formed at one end portion of the can 201 where an open portion 202 is formed. According to an embodiment, the crimping portion 205 may be bent from the one end portion of the can 201 and positioned to face the other surface of the cover 300, which faces the space outside the can 201.

[0136] In one embodiment, a cover gasket G1 for electrically insulating the cover plate 300 and the single cover 200 can be disposed between the cover plate 300 and the rolled edge portion 205.

[0137] According to the embodiment, the cover gasket G1 can be configured to cover (e.g., completely cover) the end portion of the cover plate 300. The outer surface of the cover gasket G1 can be pressed and fixed to the inner surfaces of the grooved portion 204 and the rolled edge portion 205. The cover gasket G1 can be formed of an insulating material (such as rubber, polyethylene (PE), polypropylene (PP), polyethylene terephthalate (PET), etc.). Therefore, the cover gasket G1 can electrically insulate the cover plate 300 and the monolithic cover 200, and prevent moisture, foreign matter, etc. from being introduced between the cover plate 300 and the monolithic cover 200.

[0138] The rolled edge portion 205 can be configured to face the other surface of the cover plate 300, with the cover gasket G1 inserted between them, and the rolled edge portion 205 can contact the cover gasket G1 to press the cover plate 300 against the grooved portion 204. Therefore, the cover plate 300 can be stably fixed to the open portion 202 side of the single cover member 200.

[0139] In one embodiment, the cover plate 300 may be formed of a metallic material to provide mechanical rigidity, and in another embodiment, it may be formed of a synthetic resin material that does not have electrical conductivity.

[0140] The cover 300 may be provided with a vent 301, which is configured to open when the internal pressure of the tank 201 exceeds a certain (e.g., predetermined) pressure.

[0141] The thickness of the vent 301 according to the embodiment may be less than the thickness of other areas of the cover plate 300. For example, the vent 301 may have a recessed shape, which is formed to be recessed from one of the two surfaces or opposite surfaces of the cover plate 300 toward the other surface. The vent 301 may be spaced apart from the center of the cover plate 300 and may have an annular shape concentric with the cover plate 300. As another example, the vent 301 may have at least one pattern having a straight or curved shape.

[0142] Terminal 400 can be incorporated into the single-unit cover 200 and electrically connected to the electrode assembly 100 via the first current collector 500, which will be described below. Terminal 400 can be formed of a metallic material having electrical conductivity (e.g., a material such as aluminum, nickel, copper, etc.).

[0143] In this embodiment, since terminal 400 is electrically connected to the first electrode plate 110 of electrode assembly 100 via the first current collector 500, terminal 400 can be used as the positive electrode terminal of battery cell 2. However, terminal 400 is not limited to this and can be used as a negative electrode terminal by being electrically connected to the second electrode plate 120.

[0144] According to the embodiment, the terminal 400 can pass through the closed portion 203 of the monomer cover 200 in a first direction. In the embodiment, the terminal 400 can be inserted into the monomer cover 200 through a hole formed in the central portion of the closed portion 203. The outer peripheral surface of the terminal 400 can be configured to be spaced apart from the inner peripheral surface of the hole formed in the central portion of the closed portion 203 by a distance (e.g., a predetermined distance). The two end portions or opposite end portions of the terminal 400 can be respectively disposed in the space inside the can 201 and the space outside the can 201.

[0145] In this embodiment, the terminals 400 disposed in the spaces inside and outside the can 201 can be plastically deformed during compression and welding, and can be configured to contact (e.g., in close contact) the outer and inner surfaces of the closure portion 203. Therefore, the terminals 400 can be stably secured to the monolithic cover 200 while passing through the closure portion 203.

[0146] The second current collector 600 can be disposed between the electrode assembly 100 and the cover plate 300, and can be connected to the electrode assembly 100. The second current collector 600 can be formed of a metallic material with electrical conductivity (e.g., a material such as aluminum, nickel, copper, etc.).

[0147] The second current collector 600 according to an embodiment may include a flat surface portion 610 and an extension portion 620 extending from the flat surface portion 610, the flat surface portion 610 facing the other end portion of the electrode assembly 100, and a second uncoated portion 121 protruding at the other end portion.

[0148] The surface of the flat surface portion 610 facing the other end portion of the electrode assembly 100 can be connected to the second uncoated portion 121. Therefore, in this embodiment, the second current collector 600 can be used as a negative electrode current collector. The end portion of the second uncoated portion 121 can be bent in a direction parallel to the flat surface portion 610 and can be connected to the surface of the flat surface portion 610 by welding or the like. The bending direction of the second uncoated portion 121 can be towards the winding axis C of the electrode assembly 100.

[0149] The extension portion 620 can extend from the edge of the flat surface portion 610 toward the cover plate 300. The extension portion 620 can contact the inner surface of the grooved portion 204. The extension portion 620 can be rounded or bent along the grooved portion 204. The extension portion 620 can be connected to the grooved portion 204 by welding or the like. Therefore, the single cover 200 and the second electrode plate 120 can be electrically connected to each other, and the closed portion 203 can be used as a negative electrode terminal.

[0150] In one embodiment, a plurality of extension portions 620 may be formed. The plurality of extension portions 620 may be configured to be spaced apart from each other along the edge of the flat surface portion 610.

[0151] However, the battery cell 2 according to the present invention is not limited thereto, and the second uncoated portion 121 of the electrode assembly 100 can be directly connected to the cover plate 300.

[0152] Figure 6 This is a schematic view illustrating the housing according to an embodiment of the present invention. (Refer to...) Figure 6 According to an embodiment of the present invention, the housing 1 may include a housing body 11, a housing cover 12, and a housing frame 13.

[0153] The housing body 11 can be formed into a box shape having an empty interior and open sides. However, the cross-sectional shape of the housing body 11 is not limited to... Figure 1 and Figure 6 The rectangular shape shown can be any shape of various shapes, such as polygonal shapes, circular shapes, elliptical shapes, etc.

[0154] The housing cover 12 can be attached to the housing body 11 and enclose the internal space of the housing body 11. In the example, the housing cover 12 can be formed with a generally plate shape and can be configured as an open side facing the housing body 11. The housing cover 12 can be secured to the housing body 11 by any of various types of joining methods, such as bolting, welding, mating, etc.

[0155] The housing frame 13 is formed on the housing body 11 and guides the installation of the housing 4. The housing 4 can be manufactured in any shape of various forms depending on the size and arrangement of the battery cell 2, and can be seated on the housing body 11. In embodiments, the housing 4 can be press-fitted or fixed to the housing frame 13. In embodiments, the housing 4 can be fixedly attached to the interior of the housing body 11 by any of various joining methods via the housing frame 13. The housing frame 13 can have a protruding shape extending from the housing body 11. Multiple housing frames 13 can be provided on the housing body 11, such that the mounting position of the housing 4 can be changed according to the size and shape of the battery cell 2, and the housing 4 can be selectively mounted on the housing frame 13.

[0156] Figure 7 This is a schematic plan view of the shell according to an embodiment of the present invention. Figure 8 This is a schematic cross-sectional view of the shell according to an embodiment of the present invention. Figure 9 This is an enlarged view of the main part of the shell according to an embodiment of the present invention. (Refer to...) Figures 7 to 9 According to an embodiment of the present invention, the shell 4 may include a shell base portion 20 and a shell support portion 30. The shell base portion 20 and the shell support portion 30 may be formed of an insulating material.

[0157] The shell base portion 20 can be supported by the shell 1. The shell base portion 20 can be fitted and attached to the shell frame 13.

[0158] The shell support portion 30 can be connected to the shell base portion 20 and can support multiple battery cells 2. In an embodiment, the shell support portion 30 can be integrally formed with the shell base portion 20. The shell base portion 20 can be disposed between the shell support portions 30. The shell support portion 30 can support battery cells 2 arranged in one or more rows.

[0159] The shell base portion 20 may include a base seating portion 21 and a base protrusion 22.

[0160] The base mounting portion 21 can be mounted on the housing 1. A mounting groove 23 is formed in the lower part of the base mounting portion 21, and the housing frame 13 is inserted into the mounting groove 23 to maintain the base mounting portion 21 in a stable and fixed state.

[0161] The base protrusion 22 may protrude from the base mounting portion 21 in a fourth direction. This fourth direction may be the Z-axis direction. The base mounting portion 21 may have a width in a second direction (i.e., the X-axis direction) and a length in a third direction (i.e., the Y-axis direction). The base protrusion 22 may have lengths in the Z-axis direction on both the left and right sides of the base mounting portion 21. Furthermore, the base protrusion 22 may have lengths in an inclined direction, which is an inclination relative to the Z-axis direction. The base protrusion 22 may connect to the shell support portion 30 to support the shell support portion 30.

[0162] The shell support portion 30 may include a support side cover 31, a support protrusion 32, and a support plate 33.

[0163] The support-side cover 31 can be connected to the housing base portion 20 and can surround the row of battery cells 2. A pair of support-side covers 31 can be arranged facing each other, and the battery cells 2 can be arranged in a row between a pair of support-side covers 31. According to an embodiment, the battery cells 2 can be arranged in multiple rows between a pair of support-side covers 31. Each support-side cover 31 can be provided on a base protrusion 22, which is provided on both sides or opposite sides of the base seating portion 21.

[0164] At the edge of the housing body 11, a support-side cover 31 can be connected to an opposing support-side cover 31. That is, a pair of opposing support-side covers 31 are arranged in a row in the second direction (i.e., the X-axis direction), and a support connection 35 is formed at the end portion of the support-side cover 31 in the Y-axis direction to constrain the portion of the support-side cover 31 not connected to the housing base portion 20 and to support the battery cell 2. A portion of the space where the support connection 35 is provided can be open to allow gas emitted between the support-side covers 31 to pass through. The pair of support-side covers 31 can have a cross-section with a shape resembling the number 8 connected in the Y-axis direction. In this case, the middle region of the shape resembling the number 8 can be removed to accommodate the battery cell 2.

[0165] The support protrusion 32 can be connected to the support side cover 31 and can support the lower part of the battery cell 2. The support protrusion 32 can directly support the bottom edge of the battery cell 2, and the support plate 33 connected to the support protrusion 32 can support the battery cell 2.

[0166] The support plate 33 can be attached to the support protrusion 32 and spaced apart from the battery cell 2, and can rupture to release gas emitted from the battery cell 2. The thickness d1 of the support protrusion 32 can be greater than the thickness d2 of the support plate 33. The support plate 33 can be positioned at the lower point of the support protrusion 32. The support plate 33 can be spaced apart from the battery cell 2 by the difference between the thickness d1 of the support protrusion 32 and the thickness d2 of the support plate 33.

[0167] The vent 301 of the battery cell 2 can be located inside the support protrusion 32. That is, the battery cell 2 can be located on the support protrusion 32, so that the support plate 33 can be positioned to face the vent 301 of the battery cell 2.

[0168] The thickness d1 of the supporting protrusion 32 is greater than the thickness d3 of the first space 5. The difference between the thickness d1 of the supporting protrusion 32 and the thickness d2 of the supporting plate 33 can be the thickness d3 of the first space 5. In an embodiment, the thickness d3 of the first space 5 can be less than the thickness d4 of the second space 6.

[0169] The support protrusion 32 can support multiple battery cells 2 arranged in a row. In this case, the support protrusion 32 can directly support the edge of the battery cell 2, and the support plate 33 can be combined with the inside of the support protrusion 32 to allow gas to escape.

[0170] Figure 10 This is a schematic plan view of a support plate according to an embodiment of the present invention. Figure 11 This is a schematic plan view of a support plate according to another embodiment of the present invention. Figure 12 This is a schematic plan view of a support plate according to another embodiment of the present invention. Figure 13 This is a schematic plan view of a support plate according to another embodiment of the present invention. (Refer to...) Figures 10 to 13 The support plate 33 may include a plate covering portion 331 and a plate exhaust portion 332.

[0171] The plate cover portion 331 can be attached to the support protrusion 32 and can cover the open area inside the support protrusion 32. The thickness of the plate cover portion 331 can correspond to the thickness of the support protrusion 32. In an embodiment, the thickness of the plate cover portion 331 can be less than the thickness of the support protrusion 32.

[0172] The plate venting portion 332 can be formed in the plate cover portion 331, disposed in the gas emission area of ​​the battery cell 2, and configured to rupture due to gas pressure to release gas. In an embodiment, the thickness of the plate venting portion 332 can be less than the thickness of the plate cover portion 331.

[0173] The plate cover portion 331 and the plate vent portion 332 can be disposed in the gas emission area of ​​the battery cell 2. The plate cover portion 331 can deform due to the cracking of the plate vent portion 332, thereby allowing gas to be easily emitted. The support plate 33 can cover the inner side of the support protrusion 32, and each support protrusion 32 can support the edge of the battery cell 2.

[0174] like Figure 10As shown, in the embodiment of the support plate 33, the plate covering portion 331 may have a circular cross-section, and the plate venting portion 332 may have a cross shape inside the plate covering portion 331. The two end portions or opposite end portions of the plate venting portion 332 may be coupled to the support protrusion 32 (see...). Figure 10 ).

[0175] like Figure 11 As shown, in the embodiment of the support plate 33, the plate covering portion 331 may have a circular cross-section, and the plate venting portion 332 may have a concentric circle shape inside the plate covering portion 331. Two or more plate venting portions 332 may be disposed inside the plate covering portion 331 (see [reference]). Figure 11 ).

[0176] like Figure 12 As shown, in the embodiment of the support plate 33, the plate covering portion 331 may have a circular cross-section, and the plate venting portion 332 may have a spoke shape inside the plate covering portion 331. The two end portions or opposite end portions of the plate venting portion 332 may be coupled to the support protrusion 32 (see...). Figure 12 ).

[0177] like Figure 13 As shown, in the embodiment of the support plate 33, the plate covering portion 331 may have a circular cross-section, and the plate venting portion 332 may have a grid pattern shape inside the plate covering portion 331. The two end portions or opposite end portions of the plate venting portion 332 may be attached to the support protrusion 32 (see...). Figure 13 ).

[0178] That is, the plate exhaust portion 332 can be formed into any shape, such as a cross shape, a concentric circle shape, a spoke shape, or a grid pattern shape.

[0179] Figure 14 This is a schematic view illustrating a support protrusion according to another embodiment of the invention. (Refer to...) Figure 14 The support protrusion 32 may include a protrusion plate 321 and a protrusion ring 322. The battery cells 2 may be arranged in multiple rows on the support protrusion 32.

[0180] The raised plate 321 can be connected to the support side cover 31. The lower portions of the support side covers 31 facing each other can be held in a connected state by the raised plate 321. The thickness of the raised plate 321 can be sufficient to support the load of multiple battery cells 2 arranged in multiple rows.

[0181] A raised ring 322 can be formed on the raised plate 321, and a support plate 33 can be provided inside the raised ring 322. The raised ring 322 can support the lower edge of the battery cells 2 arranged in multiple rows. The thickness of the raised ring 322 can correspond to the thickness of the raised plate 321.

[0182] The support protrusion 32 may further include a protrusion groove 323. The protrusion groove 323 may be formed in the protrusion plate 321, and one or more protrusion grooves 323 may be disposed along the periphery of the protrusion ring 322 and configured to allow gas inflow and outflow. The protrusion groove 323 may rupture due to gas pressure to form a through hole. The thickness of the protrusion groove 323 may be less than the thickness of the protrusion plate 321. The thickness of the protrusion groove 323 may correspond to... Figures 10 to 13 The thickness of the venting section 332 in the plate.

[0183] In one embodiment, the raised groove 323 may be positioned within a range of 45 degrees to 360 degrees along the periphery of the raised ring 322 in the periphery direction. That is, the raised groove 323 may be configured as at least one-eighth of a ring. In another embodiment, the raised groove 323 may have a circular or polygonal shape and may be configured to surround each raised ring 322.

[0184] If the internal gas of the battery cell 2 expands and is released, the support plate 33 will rupture first due to the gas pressure, allowing the gas to be released smoothly. If the gas pressure inside the first space 5 rises due to the gas being released from the multiple battery cells 2, the protrusion groove 323 can rupture to suppress the rise in gas pressure.

[0185] Figure 15 This is a schematic view showing the state of the fire extinguishing unit according to an embodiment of the present invention. Figure 16 This is a schematic side view illustrating the fire extinguishing unit according to an embodiment of the present invention. Figure 17 This is a schematic view illustrating a fire extinguishing disc according to an embodiment of the present invention. (Refer to...) Figures 15 to 17 The battery pack according to an embodiment of the present invention may further include a fire extinguishing unit 7.

[0186] The fire extinguishing unit 7 can be installed in at least one of the first space 5 and the second space 6, and can suppress the combustion of the battery cell 2.

[0187] The fire extinguishing unit 7 may include fire extinguishing discs 71 and fire extinguishing belts 72.

[0188] The fire extinguishing disc 71 includes a fire extinguishing agent, and a fire extinguishing strip 72 formed on the fire extinguishing disc 71 can be attached and secured to at least one of the support plate 33 and the housing 1. In one embodiment, the fire extinguishing disc 71 can be stacked on the fire extinguishing strip 72. In another embodiment, the fire extinguishing strip 72 can be coated with an adhesive to attach to at least one of the support plate 33 and the housing 1.

[0189] In an embodiment, the fire extinguishing disc 71 may include a disc body 711 and a disc capsule 712.

[0190] The fire extinguishing hose 72 can be attached to the body 711. In one embodiment, multiple bladders 712 can be included within the body 711. In another embodiment, the bladder 712 is a spherical bladder in which the extinguishing agent can be stored.

[0191] The tablet body 711 can be formed by mixing epoxy resin with additives. In this case, a curing agent that cures the epoxy resin to guide the uniform placement of the tablet capsule 712 can be used as an additive.

[0192] The epoxy resin, additives, and flakes 712 can be stirred to prepare a mixture, which can then be placed in a molding die and left to stand. After a certain period of time, the epoxy resin cures, and the flakes 712 are evenly distributed inside the epoxy resin.

[0193] In one embodiment, the content of the capsule 712 can be 30% to 50%. That is, the volume of the capsule 712 embedded in the tablet body 711 can be 30% to 50% of the total volume of the tablet body 711. In another embodiment, the volume of the capsule 712 can be 30% to 50% of the volume of the epoxy resin and the additives.

[0194] In this embodiment, the thickness t1 of the fire extinguishing disc 71 can be 5 to 15 times the thickness t2 of the fire extinguishing belt 72. That is, if the thickness t2 of the fire extinguishing belt 72 is 1 mm, then the thickness t1 of the fire extinguishing disc 71 is 5 mm to 15 mm.

[0195] In this embodiment, the width d of the extinguishing section 7 can be in the range of 5 mm to 30 mm. If the width d of the extinguishing section 7 is less than 5 mm, the flap 712 may have difficulty entering.

[0196] The gas emission process of a battery pack having the above structure according to an embodiment of the present invention will now be described.

[0197] The casing 4 is mounted on the casing 1, and the battery cells 2 are arranged in one or more rows according to the shape of the casing 4. In this case, the vent 301 of the battery cells 2 is positioned to face the casing 4.

[0198] The shell 4 includes a shell base portion 20 mounted on the shell 1 and a shell support portion 30 supporting the battery cell 2. A support plate 33 in the shell support portion 30 is spaced apart from the battery cell 2 to form a first space 5. The shell support portion 30 and the shell 1 are spaced apart to form a second space 6.

[0199] If the internal gas of the battery cell 2 expands under the above conditions, the vent 301 of the battery cell 2 will rupture, and the gas will be discharged to the outside. Because the first space 5 is formed between the battery cell 2 and the casing support 30, the vent 301 is prone to rupture when the internal gas of the battery cell 2 expands.

[0200] If the support plate 33 ruptures due to gas emitted from the battery cell 2, the gas moves to the shell base portion 20 to alleviate the gas pressure.

[0201] The fire extinguishing unit 7 is disposed in at least one of the first space 5 and the second space 6, and can release fire extinguishing agent to prevent or substantially prevent a fire caused by high temperature if the temperature rises.

[0202] In a battery pack according to one or more embodiments of the present invention, a first space 5 is formed between the battery cell 2 and the casing 4, and a second space 6 is formed between the casing 4 and the housing 1. The casing 4 is ruptured due to the gas pressure of the battery cell 2 to stably release gas.

[0203] In a battery pack according to one or more embodiments of the present invention, a fire extinguishing unit 7 is disposed in at least one of a first space 5 and a second space 6, thereby providing rapid fire extinguishing if a battery cell 2 burns.

[0204] According to another aspect of the embodiments of this disclosure, a battery pack with an improved structure and a vehicle including the battery pack are provided.

[0205] However, the aspects and technical effects obtainable through this disclosure are not limited to those described above, and those skilled in the art will clearly understand from the above description of the invention other aspects and technical effects not mentioned.

[0206] Although this disclosure 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.

Claims

1. A battery pack, comprising: case; Multiple battery cells are housed within the casing; Busbar, electrically connecting the multiple battery cells; A housing, mounted on the housing and supporting the battery cells among the plurality of battery cells; A first space is provided between the battery cell and the casing for venting gas. as well as The second space is located between the shell and the housing.

2. The battery pack according to claim 1, wherein, The housing includes: Shell body; A housing cover that covers the open portion of the housing body; and A housing frame is mounted on the housing body to guide the installation of the housing.

3. The battery pack according to claim 1, wherein, The shell includes: The shell base portion is supported by the shell; and The shell support portion is connected to the shell base portion and supports the battery cell.

4. The battery pack according to claim 3, wherein, The shell base portion includes: The base seat portion is seated on the housing; and The substrate protrudes from the substrate seating portion in a first direction.

5. The battery pack according to claim 3, wherein, The shell support portion includes: A support side cover is connected to the shell base and covers the rows of battery cells; A support protrusion, connected to the support side cover and supporting the lower portion of the row of battery cells; and The support plate, attached to the support protrusion, is spaced apart from the battery cell and is ruptureable to release gases emitted from the battery cell.

6. The battery pack according to claim 5, wherein, The vent of the battery cell is located inside the support protrusion.

7. The battery pack according to claim 5, wherein, The thickness of the support protrusion is greater than the thickness of the first space.

8. The battery pack according to claim 5, wherein, The support protrusions support the battery cells arranged in a row.

9. The battery pack according to claim 5, wherein, The support protrusion includes: A raised plate, connected to the support-side cover; and A raised ring is arranged on the raised plate, and a support plate is located inside the raised ring. The raised ring supports the lower portion of each of the multiple rows of battery cells.

10. The battery pack according to claim 9, wherein, The support protrusion further includes one or more protrusion grooves arranged in the protrusion plate along the periphery of the protrusion ring and configured to allow gas inflow and outflow.

11. The battery pack according to claim 10, wherein, The protrusions in the one or more protrusions are arranged in the perimeter direction within a range of 45 degrees to 360 degrees.

12. The battery pack according to claim 5, wherein, The support plate includes: The plate cover portion is integrated with the support protrusion and spaced apart from the battery cell; and The plate exhaust section, located in the gas exhaust region of the battery cell within the plate cover portion, is configured to rupture due to gas pressure to exhaust the gas.

13. The battery pack according to claim 12, wherein, The thickness of the plate covering portion is greater than the thickness of the plate exhaust portion.

14. The battery pack according to claim 13, wherein, The plate exhaust portion has any shape, including cross shape, concentric circle shape, spoke shape, and grid pattern shape.

15. The battery pack according to claim 1, further comprising a fire extinguishing unit located in at least one of the first space and the second space, and configured to suppress combustion of the battery cells.

16. The battery pack according to claim 15, wherein, The fire extinguishing unit includes: Fire extinguishing discs, including fire extinguishing agents; and Fire extinguishing belt, on the fire extinguishing disc.

17. The battery pack according to claim 16, wherein, The thickness of the fire extinguishing plate is greater than the thickness of the fire extinguishing belt.

18. The battery pack according to claim 16, wherein, The fire extinguishing disc includes: The main body of the sheet, the fire extinguishing hose is attached to the main body of the sheet; and Multiple capsules are embedded in the capsule body and include the extinguishing agent.

19. The battery pack according to claim 18, wherein, The sheet body is formed by mixing epoxy resin and additives.

20. The battery pack according to claim 18, wherein, The content ratio of the plurality of capsules is 30% to 50%.

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