Battery cell, and battery pack and vehicle including same

Abstract

A battery cell, and a battery pack and a vehicle including same are disclosed. The battery cell according to an embodiment of the present invention includes: an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator and having a central hole; a battery can in which the electrode assembly is accommodated; and a current collecting plate electrically connected to the electrode assembly, wherein the electrode assembly includes a combustion promoting member.

Description

Battery cells, battery packs containing the same, and vehicles

[0001] This application claims priority to Korean Patent Application No. 10-2024-0106943, filed on August 9, 2024, and all contents disclosed in the specification and drawings of the said application are incorporated by reference into this application.

[0002] The present invention relates to a battery cell, a battery pack including the same, and a vehicle, and more particularly, to a battery cell capable of preventing the spread of flame, a battery pack including the same, and a vehicle.

[0003] Secondary batteries, which have high applicability according to product group and electrical characteristics such as high energy density, are widely used not only in portable devices but also in electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electrical power sources.

[0004] These secondary batteries are attracting attention as a new energy source for environmental friendliness and energy efficiency because they not only have the primary advantage of drastically reducing the use of fossil fuels, but also have the advantage of producing no byproducts from energy use.

[0005] Commonly used secondary battery types include lithium-ion batteries, lithium polymer batteries, nickel-cadmium batteries, nickel-metal hydride batteries, and nickel-zinc batteries. The operating voltage of these unit secondary battery cells ranges from approximately 2.5 V to 4.5 V.

[0006] Therefore, when a higher output voltage is required, multiple battery cells are connected in series to form a battery module or battery pack. Furthermore, depending on the required charge / discharge capacity, a number of battery cells are connected in parallel to form a battery module or battery pack. Accordingly, the number and electrical connection configuration of battery cells included in a battery module or battery pack can be varied depending on at least one of the required output voltage and charge / discharge capacity.

[0007] Meanwhile, known secondary battery cell types include cylindrical, prismatic, and pouch-shaped battery cells. Cylindrical battery cells are constructed by interposing a separator, which serves as an insulator, between the positive and negative plates, winding the separator to form a jelly-roll-shaped electrode assembly. This assembly, along with an electrolyte, is then inserted into a battery can to form the battery. Furthermore, cylindrical battery cells may use current collectors to electrically connect the positive and negative plates.

[0008] Lithium secondary batteries are currently in the spotlight due to their advantages such as high operating voltage and significantly higher energy density. However, because they use organic electrolytes, there is a problem that lithium secondary batteries can cause overcurrent and overheating when overcharged, which in severe cases can cause fire due to explosion or ignition.

[0009] Figure 1 is a cross-sectional view of a normal battery cell, and Figure 2 is a drawing showing a situation in which a flame has occurred in the battery cell of Figure 1.

[0010] When a thermal event occurs in a battery cell (1) of FIG. 1, the cap plate (2) of the battery cell (1) ruptures as shown in FIG. 2, causing a flame (3) to be emitted to the outside of the battery cell (1). In this way, when a flame is generated from one battery cell (1) and emitted to the outside of the battery cell (1), heat transfer to an adjacent battery cell (1) may be accelerated.

[0011] And, due to this, a thermal runaway phenomenon may occur, and there is a problem that the driver of an electric vehicle may be burned or put in a dangerous situation due to this thermal runaway phenomenon.

[0012] Accordingly, the technical problem to be achieved by the present invention is to provide a battery cell, a battery pack including the same, and a vehicle capable of preventing flames from spreading to adjacent battery cells even if flames occur in one battery cell.

[0013] In addition, the present invention provides a battery pack and a vehicle including the same that can prevent chain thermal runaway by preventing flame transfer and improve the stability of battery cells.

[0014] However, the technical problems to be solved by the present invention are not limited to the problems described above, and other problems not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0015] According to one aspect of the present invention, a battery cell including an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator and having a central hole formed therein, a battery can in which the electrode assembly is accommodated, and a current collector electrically connected to the electrode assembly, wherein the electrode assembly includes a combustion promoting member, may be provided.

[0016] In one embodiment, the combustion promoting member may include a center pin inserted into the center hole of the electrode assembly; and an ignition agent provided in the center pin.

[0017] In one embodiment, the ignition agent may include red phosphorus or gunpowder.

[0018] In one embodiment, the ignition agent may be applied to the outer surface of the center pin.

[0019] In one embodiment, the center pin may be made of a combustible material.

[0020] In one embodiment, the combustion promoting member may include a center pin inserted into the center hole of the electrode assembly; and a combustion promoting agent provided in the center pin.

[0021] In one embodiment, the catalyst may include a gas that assists combustion of the electrode assembly.

[0022] In one embodiment, the co-agent may include one of oxygen, chlorine, and fluorine.

[0023] In one embodiment, the auxiliary agent may be stored inside the center pin.

[0024] In one embodiment, a storage unit is coupled to the center pin, and the auxiliary agent can be stored in the storage unit.

[0025] In one embodiment, the storage unit may be manufactured to include at least one of vinyl, plastic, and rubber.

[0026] Meanwhile, according to another aspect of the present invention, a battery pack including at least one of the aforementioned battery cells may be provided, and further, a vehicle including at least one battery cell may be provided.

[0027] Embodiments of the present invention have the effect of preventing flames from spreading to adjacent battery cells even if flames occur in one battery cell.

[0028] In addition, it has the effect of preventing serial thermal runaway by preventing flame transfer and improving the stability of battery cells.

[0029] However, the effects that can be obtained through the present invention are not limited to the effects described above, and other technical effects not mentioned can be clearly understood by those skilled in the art from the description of the invention described below.

[0030] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the invention described below, serve to further understand the technical idea of ​​the present invention, and therefore, the present invention should not be interpreted as being limited to matters described in such drawings.

[0031] Figure 1 is a cross-sectional view of a normal battery cell.

[0032] Figure 2 is a drawing illustrating a situation in which a flame occurs in the battery cell of Figure 1.

[0033] Figure 3 is a cross-sectional view of a battery cell according to the first embodiment of the present invention.

[0034] Figure 4 is a drawing illustrating a situation in which a flame occurs inside the battery cell of Figure 3.

[0035] Figure 5 is a cross-sectional view of a battery cell according to a second embodiment of the present invention.

[0036] Figure 6 is a cross-sectional view of a battery cell according to a third embodiment of the present invention.

[0037] Figure 7 is a cross-sectional view of a battery cell according to a fourth embodiment of the present invention.

[0038] Figure 8 is a cross-sectional view of a battery cell according to a fifth embodiment of the present invention.

[0039] Figure 9 is a cross-sectional view of a battery cell according to a sixth embodiment of the present invention.

[0040] FIG. 10 is a schematic diagram showing the configuration of a battery pack including battery cells according to each embodiment of the present invention.

[0041] FIG. 11 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0042] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Terms or words used in this specification and claims should not be interpreted as limited to their conventional or dictionary meanings, but should be interpreted with meanings and concepts that conform to the technical idea of ​​the present invention based on the principle that the inventor can appropriately define the concept of the term to best explain his or her own invention. Therefore, it should be understood that the embodiments described in this specification and the configurations illustrated in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical idea of ​​the present invention, and various equivalents and modifications may exist as of the time of this application.

[0043] In the drawings, the sizes of each component or specific parts of that component are exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect its actual size. If a detailed description of a related known function or configuration is deemed to unnecessarily obscure the gist of the present invention, such description will be omitted.

[0044] The term 'joint' or 'connection' as used herein includes not only cases where one member is directly joined or directly connected to another member, but also cases where one member is indirectly joined or indirectly connected to another member through a connecting member.

[0045] FIG. 3 is a cross-sectional view of a battery cell according to a first embodiment of the present invention, and FIG. 4 is a drawing illustrating a situation in which a flame has occurred inside the battery cell of FIG. 3.

[0046] Referring to FIG. 3, a battery cell (10) according to one embodiment of the present invention includes an electrode assembly (100), a battery can (200), and a current collector plate (e.g., a negative current collector plate (300) and a positive current collector plate (500)).

[0047] The electrode assembly (100) includes a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate. Here, the separator may be formed in a jelly roll type having a structure wound in one direction.

[0048] For example, the electrode assembly (100) can be manufactured by winding a laminate formed by sequentially stacking a negative electrode plate, a separator, a positive electrode plate, and a separator at least once. Here, the positive electrode plate and the negative electrode plate can be formed in a sheet shape.

[0049] That is, the electrode assembly (100) applied to the present embodiment may be a coiled type electrode assembly (100). In this case, an additional separator may be provided on the outer circumferential surface of the electrode assembly (100) for insulation from the battery can (200). That is, the electrode assembly (100) may have a coiled structure well known in the related technical field without limitation.

[0050] The electrode assembly (100) may include a combustion promoting member (900). There are various ways in which the electrode assembly (100) includes the combustion promoting member (900), and specific details thereof will be described later.

[0051] A positive electrode plate may have a positive electrode active material applied to one or both sides thereof, and a first non-coated portion on which the positive electrode active material is not applied may be formed at an end of the positive electrode plate. The first non-coated portion may be exposed to the outside of the separator while forming a plurality of winding turns based on the center of the electrode assembly (100) and may be used as an electrode tab in itself. A battery cell (10) according to an embodiment of the present invention may include an embodiment of a positive electrode plate in which the first non-coated portion is not formed. However, for convenience of explanation, the following description will focus on a case in which the first non-coated portion is formed on the positive electrode plate.

[0052] The negative electrode plate may have a negative active material applied to one or both sides thereof, and a second non-coated portion on which the negative active material is not applied may be formed at an end of the negative electrode plate. The second non-coated portion may be exposed to the outside of the separator while forming a plurality of winding turns based on the center of the electrode assembly (100) and may be used as an electrode tab in itself. A battery cell (10) according to an embodiment of the present invention may include an embodiment of a negative electrode plate in which the second non-coated portion is not formed. However, for convenience of explanation, the following description will focus on a case in which the second non-coated portion is formed on the positive electrode plate.

[0053] That is, at least one of the positive and negative electrode plates may include a non-coated portion, which is not coated with an active material, at a long end in the winding direction. In addition, the first non-coated portion and the second non-coated portion may be configured to face in opposite directions.

[0054] Here, the positive electrode active material coated on the positive electrode plate and the negative electrode active material coated on the negative electrode plate can be used without limitation as long as they are active materials known in the art.

[0055] In addition, the separation membrane may be a porous polymer film, for example, a porous polymer film made of a polyolefin polymer such as an ethylene homopolymer, a propylene homopolymer, an ethylene / butene copolymer, an ethylene / hexene copolymer, an ethylene / methacrylate copolymer, etc., which may be used alone or in a laminated manner.

[0056] As another example, the separator may be a conventional porous nonwoven fabric, such as a nonwoven fabric made of high-melting-point glass fiber, polyethylene terephthalate fiber, etc.

[0057] At least one surface of the membrane may include a coating layer of inorganic particles. Furthermore, the membrane itself may be formed of a coating layer of inorganic particles. The particles constituting the coating layer may have a structure in which they are bound to a binder such that an interstitial volume exists between adjacent particles.

[0058] Referring to FIG. 3, a center hole (110) may be formed in the center of the electrode assembly (100), and the center hole (110) of the electrode assembly (100) may also be used for welding the cell terminal (400, positive terminal) and the positive current collector (500). That is, the electrode assembly (100) may be configured to weld the cell terminal (400) and the positive current collector (500) by irradiating a laser through the center hole (110). In addition, a center pin (910) described below may be inserted into the center hole (110) of the electrode assembly (100).

[0059] Referring to FIG. 3, an electrode assembly (100) is housed in a battery can (200). Here, the battery can (200) may be formed, for example, in a cylindrical shape, so that the electrode assembly (100) may be housed inside the battery can (200) and may be electrically connected to the negative electrode plate of the electrode assembly (100). Accordingly, the battery can (200) may have the same polarity as the negative electrode plate, i.e., a negative electrode.

[0060] Here, the diameter of the battery can (200) is formed to be larger than the diameter of the electrode assembly (100). A gap of a preset size is formed between the battery can (200) and the positive electrode collector plate (500), and an insulator may be interposed between the gap.

[0061] If the size of the electrode assembly (100) is increased while the size of the battery can (200) is determined according to the standard, the total capacity of the battery cell (10) increases, but the gap between the battery can (200) and the electrode assembly (100) decreases.

[0062] That is, when the size of the electrode assembly (100) is increased to increase the overall capacity of the battery cell (10), the gap between the battery can (200) and the electrode assembly (100) decreases, so in order to increase the capacity of the battery cell (10), an insulator must be able to be interposed between the reduced gap between the battery can (200) and the electrode assembly (100), and for this purpose, it is preferable that the thickness of the insulator be as thin as possible.

[0063] The battery can (200) may be, for example, a roughly cylindrical container and may be made of a conductive material such as metal. The material of the battery can (200) may be made of a conductive metal such as aluminum, steel, stainless steel, etc., but is not limited thereto.

[0064] The collector plate is electrically connected to the electrode assembly (100) and may include a negative collector plate (300) and a positive collector plate (500).

[0065] The negative electrode collector plate (300) is electrically connected to the negative electrode plate. The negative electrode collector plate (300) is connected to the second non-conductive portion of the electrode assembly (100). Referring to FIG. 3, the negative electrode collector plate (300) is coupled to the upper portion of the electrode assembly (100). The negative electrode collector plate (300) is made of a conductive metal material such as aluminum, steel, copper, or nickel, and can be electrically connected to the second non-conductive portion of the negative electrode plate.

[0066] The negative electrode collector plate (300) can be electrically connected to the battery can (200). To this end, at least a portion of the edge portion of the negative electrode collector plate (300) can be interposed and fixed between the inner surface of the battery can (200) and the sealing gasket.

[0067] In one embodiment, at least a portion of the edge portion of the negative electrode current collector (300) may be fixed to the bead portion (700) formed in the battery can (200) by welding while being supported by the bead portion (700). In a modified embodiment (see FIG. 7), at least a portion of the edge portion of the negative electrode current collector (300) may be directly welded to the inner surface of the battery can (200).

[0068] And, at least a portion of the remaining portion, excluding the joining portion of the beading portion (700) of the negative electrode collector plate (300), can be joined to the folded surface of the second non-conductive portion by welding, for example, laser welding.

[0069] Additionally, the negative electrode collector (300) may be electrically coupled to a surface adjacent to the beading portion (700) and the crimping portion (800) at least at a portion of the edge.

[0070] The positive electrode collector plate (500) is electrically connected to the positive electrode plate. The positive electrode collector plate (500) is made of a conductive metal material and is connected to the first uncoated portion of the electrode assembly (100). The positive electrode collector plate (500) can be joined to a joining surface formed by bending an end of the first uncoated portion in a direction parallel to the positive electrode collector plate (500). The bending direction of the first uncoated portion may be, for example, a direction toward the winding center of the electrode assembly (100).

[0071] When the first non-conductive portion has such a folded shape, the space occupied by the first non-conductive portion can be reduced, thereby improving energy density. In addition, the increased bonding area between the first non-conductive portion and the positive electrode current collector (500) can lead to improved bonding strength and reduced resistance.

[0072] The cell terminal (400) is made of a conductive metal material and is electrically connected to the positive electrode collector plate (500). In addition, the cell terminal (400) is electrically connected to the positive electrode plate of the electrode assembly (100) through the positive electrode collector plate (500), thereby having a positive polarity.

[0073] That is, the cell terminal (400) can function as a positive terminal. In addition, the battery can (200) is electrically connected to the negative plate of the electrode assembly (100) as described above, thereby having a negative polarity.

[0074] The cap plate (600) is configured to seal the opening formed in the battery can (200). The cap plate (600) may be made of, for example, a metal material to ensure rigidity. In addition, the cap plate (600) may be provided as non-polar, separated from the electrode assembly (100). That is, even if the cap plate (600) is provided as a conductive metal material, it may not have polarity.

[0075] The fact that the cap plate (600) does not have polarity means that the cap plate (600) is electrically insulated from the battery can (200) and the cell terminal (400). As such, the cap plate (600) does not have to have polarity, and its material does not necessarily have to be a conductive metal.

[0076] A beading portion (700) and a crimping portion (800) may be formed in the battery can (200), and the cap plate (600) may be supported by being seated on the beading portion (700) formed in the battery can (200). In addition, the cap plate (600) is fixed by the crimping portion (800). A sealing gasket may be interposed between the cap plate (600) and the crimping portion (800) of the battery can (200) to ensure airtightness of the battery can (200).

[0077] The beading portion (700) is formed by pressing the outer circumference of the battery can (200) inward. The beading portion (700) supports the electrode assembly (100) so that the electrode assembly (100), which has a size roughly corresponding to the width of the battery can (200), does not fall out of the battery can (200), and can also function as a support on which the cap plate (600) is secured. In addition, the beading portion (700) can support the outer circumferential surface of the sealing gasket.

[0078] The crimping portion (800) is provided to extend and bend toward the inside of the battery can (200) and wrap around and secure the edge of the cap plate (600) together with the sealing gasket. In addition, the crimping portion (800) may be formed on the upper or lower portion of the beading portion (700).

[0079] In addition, the present invention includes a case where the battery can (200) does not have at least one of the beading portion (700) and the crimping portion (800). In this case, at least a portion of the edge portion of the negative electrode collector plate (300) may be configured to be directly welded to the inner surface of the battery can (200) to support the electrode assembly (100). In addition, the cap plate (600) may also be directly connected to the battery can (200).

[0080] This will be described later in Figures 7 to 9.

[0081] As described above, the electrode assembly (100) includes a combustion promoting member (900), and the combustion promoting member (900) will be described in detail below.

[0082] Referring to FIG. 3, the combustion promoting member (900) may include a center pin (910) and an ignition agent (920). The center pin (910) is inserted into the center hole (110) of the electrode assembly (100). Here, the center pin (910) may contact the electrode assembly (100) to structurally support the electrode assembly (100), or may be separated from the center pin (910) and coupled to a portion other than the electrode assembly (100), for example, a current collector.

[0083] The ignition agent (920) may be provided on the center pin (910). For example, as shown in FIG. 3, the ignition agent (920) may be applied to the outer surface of the center pin (910). In addition, the ignition agent (920) causes the entire electrode assembly (100) inside the battery can (200) to combust by sparks generated from a thermal event.

[0084] As described above, when a thermal event occurs in a battery cell (10), the cap plate (600) of the battery cell (10) ruptures as shown in FIG. 2, causing the flame to be emitted to the outside of the battery cell (10) and spread to a neighboring battery cell (10).

[0085] Typically, a fire occurs under three conditions: a burning substance, oxygen, and a temperature above the ignition point. When a thermal event occurs inside a battery cell (10), the electrode assembly (100) acts as a burning substance.

[0086] Therefore, if the electrode assembly (100) is completely burned before the cap plate (600) of the battery cell (10) ruptures, that is, while the cap plate (600) is connected to the battery can (200), the burning material is extinguished and the flame can be eliminated.

[0087] In addition, since the flame is removed, it is possible to prevent the flame from spreading to other adjacent battery cells (10), and by preventing the flame from spreading, it is possible to prevent a chain reaction of thermal runaway and improve the stability of the battery cell (10).

[0088] To this end, as shown in FIG. 4, the ignition agent (920) provided in the center pin (910) is configured to be ignited by a spark generated inside the battery can (200) and burn all of the electrode assembly (100) inside the battery can (200) before the cap plate (600) of the battery cell (10) ruptures.

[0089] Here, the ignition agent (920) may be various and may include, for example, red phosphorus or gunpowder. Red phosphorus is a red-colored powder, an allotrope of phosphorus, which can easily ignite at low temperatures by reacting with air.

[0090] Gunpowder is a powdered mixture of sulfur, potassium nitrate, and charcoal, and is easily ignitable. The components of gunpowder are not limited to the aforementioned ingredients and may vary. The igniter (920) is not limited to red phosphorus or gunpowder and may vary.

[0091] Meanwhile, the center pin (910) may be made of a flammable material and may be configured so that when the electrode assembly (100) burns, the center pin (910) also burns and disappears.

[0092] Figure 5 is a cross-sectional view of a battery cell according to a second embodiment of the present invention.

[0093] The second embodiment of the present invention differs structurally from the first embodiment in that it includes a combustion aid (930) instead of an ignition agent (920). However, any portions of the second embodiment that are common to those described in the first embodiment are replaced by the description of the first embodiment. Furthermore, any portions of the second embodiment that are applicable to the first embodiment may also be applied to the first embodiment.

[0094] Referring to FIG. 5, the combustion accelerator (900) may include a center pin (910) and a combustion aid (930). The center pin (910) is inserted into the center hole (110) of the electrode assembly (100). The description of the center pin (910) is replaced with the description described above.

[0095] In addition, a combustion aid (930) is provided on the center pin (910). The combustion aid (930) may be a variety of substances that aid combustion of the electrode assembly (100), for example, a gas. For example, the combustion aid (930) may include one of oxygen, chlorine, and fluorine.

[0096] The combustion aid (930) may be positioned at various locations of the center pin (910), and for example, may be stored inside the center pin (910), as shown in FIG. 5. Furthermore, if the center pin (910) is made of a combustible material and a hole or the like is formed in at least a portion of the center pin (910) by a flame, the combustion aid (930) stored inside the center pin (910) will come out of the center pin (910) and increase the combustion action of the flame. Consequently, the electrode assembly (100) may burn more quickly.

[0097] In this way, if more of a co-propellant (930), such as oxygen, is supplied, the combustion rate of the electrode assembly (100) increases, so that the entire electrode assembly (100) inside the battery can (200) can be burned before the cap plate (600) of the battery cell (10) ruptures.

[0098] In addition, since the burning material (here, the electrode assembly) is extinguished and the flame is eliminated, the flame propagation and serial thermal runaway can be prevented, thereby improving the stability of the battery cell (10).

[0099] Figure 6 is a cross-sectional view of a battery cell according to a third embodiment of the present invention.

[0100] The third embodiment of the present invention differs in structure from the first or second embodiment in that a storage unit (940) for storing the auxiliary agent (930) is provided separately. However, in the third embodiment, any content common to the portions described in the first or second embodiment is replaced with the description of the first or second embodiment described above. In addition, any portions described in the third embodiment that are applicable to the first or second embodiment may be applied to the first or second embodiment.

[0101] Referring to FIG. 6, the storage unit (940) is coupled to the center pin (910). As in FIG. 6, for example, the storage unit (940) may be coupled to the outer periphery of the center pin (910).

[0102] And, the auxiliary agent (930) is stored in a storage unit (940). The storage unit (940) may be made of various materials, for example, but is not limited to, at least one of vinyl, plastic, and rubber.

[0103] When a flame occurs inside the battery can (200), the storage unit (940) is damaged by the flame, and the combustion agent (930) inside the storage unit (940) leaks out of the storage unit (940), increasing the combustion speed of the electrode assembly (100). A detailed description of the combustion agent (930) is replaced with the second embodiment described above.

[0104] Figure 7 is a cross-sectional view of a battery cell according to a fourth embodiment of the present invention.

[0105] The fourth embodiment of the present invention differs in structure from the first to third embodiments in that the battery can (200) does not include at least one of the beading portion (700) and the crimping portion (800). However, the common content described in the first to third embodiments of the fourth embodiment is replaced with the description of the first to third embodiments described above. In addition, the content applicable to the first to third embodiments among the parts described in the fourth embodiment can be applied to the first to third embodiments.

[0106] Referring to Fig. 7, neither the beading portion (700) nor the crimping portion (800) is formed. In addition, at least a portion of the edge portion of the negative electrode collector plate (300) is directly welded to the inner surface of the battery can (200) to support the electrode assembly (100).

[0107] In this way, when the beading portion (700) and the crimping portion (800) are not formed and the negative electrode collector plate (300) is directly welded to the inner surface of the battery can (200), the space inside the battery can (200) increases, thereby increasing the energy density.

[0108] And, referring to FIG. 7, the combustion promoting member (900) includes a center pin (910) and an ignition agent (920). A detailed description of the center pin (910) and the ignition agent (920) is replaced with the description of the first embodiment described above.

[0109] Figure 8 is a cross-sectional view of a battery cell according to a fifth embodiment of the present invention.

[0110] The fifth embodiment of the present invention is structurally different from the first to fourth embodiments in that the battery can (200) does not have at least one of the beading portion (700) and the crimping portion (800) and also includes a sintering agent (930). However, the common content described in the first to fourth embodiments of the fifth embodiment is replaced with the description of the first to fourth embodiments described above. In addition, the content applicable to the first to fourth embodiments among the parts described in the fifth embodiment can be applied to the first to fourth embodiments.

[0111] Referring to Fig. 8, neither the beading portion (700) nor the crimping portion (800) is formed. In addition, at least a portion of the edge portion of the negative electrode current collector (300) is directly welded to the inner surface of the battery can (200) to support the electrode assembly (100). The description thereof is replaced with the description of the seventh embodiment described above.

[0112] And, referring to FIG. 8, the combustion promoting member (900) includes a center pin (910) and a combustion aid (930). The description of the center pin (910) and the combustion aid (930) is replaced with the description of the second embodiment described above.

[0113] Figure 9 is a cross-sectional view of a battery cell according to a sixth embodiment of the present invention.

[0114] The sixth embodiment of the present invention is structurally different from the first to fifth embodiments in that the battery can (200) does not have at least one of the beading portion (700) and the crimping portion (800), and also includes a flammable agent (930) and a storage portion (940). However, the common content described in the first to fifth embodiments among the sixth embodiment is replaced with the description of the first to fifth embodiments described above. In addition, the content applicable to the first to fifth embodiments among the parts described in the sixth embodiment can be applied to the first to fifth embodiments.

[0115] Referring to Fig. 9, neither the beading portion (700) nor the crimping portion (800) is formed. Furthermore, at least a portion of the edge of the negative electrode collector plate (300) is directly welded to the inner surface of the battery can (200) to support the electrode assembly (100). The description thereof is replaced with the description of the seventh embodiment described above.

[0116] And, referring to FIG. 9, the combustion accelerating member (900) includes a center pin (910) and a combustion aid (930), and also includes a storage unit (940). The description of the center pin (910), the combustion aid (930), and the storage unit (940) is replaced with the description of the third embodiment described above.

[0117] FIG. 10 is a schematic diagram showing the configuration of a battery pack including battery cells according to each embodiment of the present invention.

[0118] Referring to FIG. 10, a battery pack (20) according to an embodiment of the present invention may include one or more battery cells (10) according to an embodiment of the present invention as described above. In addition, the battery pack (20) may further include a battery pack (20) (21) for storing the battery cells (10), and various devices for controlling charging and discharging of the cylindrical battery cells (10), such as a BMS, a current sensor, a fuse, etc.

[0119] FIG. 11 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.

[0120] Referring to FIG. 11, a vehicle (30) according to one embodiment of the present invention may include one or more cylindrical battery cells (10) or battery packs (20) according to each of the above-described embodiments. Here, the vehicle (30) includes various types of vehicles that are designed to use electricity, such as electric vehicles or hybrid vehicles.

[0121] In this specification, when terms indicating directions such as up, down, left, and right are used, these terms are only for convenience of explanation, and it is obvious to those skilled in the art that these terms may vary depending on the location of the target object or the location of the observer.

[0122] Although the present invention has been described above with reference to limited embodiments and drawings, the present invention is not limited thereto, and those skilled in the art to which the present invention pertains may make various modifications and variations within the scope of the technical spirit of the present invention and the equivalent scope of the claims to be described below. Therefore, the embodiments disclosed above should be considered from an illustrative rather than a restrictive perspective. In other words, the true scope of the technical spirit of the present invention is set forth in the claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

[0123] The present invention relates to a battery cell, a battery pack including the same, and an automobile, and is particularly applicable to industries related to secondary batteries.

Claims

A battery cell comprising an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator and having a central hole formed therein, a battery can in which the electrode assembly is housed, and a current collector electrically connected to the electrode assembly. The above electrode assembly is a battery cell including a combustion promoting member. In the first paragraph, The above combustion promoting member is, a center pin inserted into the center hole of the electrode assembly; and A battery cell characterized by including an ignition agent provided in the center pin. In the second paragraph, A battery cell characterized in that the ignition agent comprises red phosphorus or gunpowder. In the second paragraph, A battery cell characterized in that the ignition agent is applied to the outer surface of the center pin. In the second paragraph, A battery cell characterized in that the center pin is made of a combustible material. In the first paragraph, The above combustion promoting member is, a center pin inserted into the center hole of the electrode assembly; and A battery cell characterized by including a catalyst provided in the center pin. In paragraph 6, A battery cell characterized in that the above-mentioned auxiliary agent includes a gas that helps combustion of the electrode assembly. In paragraph 7, A battery cell characterized in that the above-mentioned co-oxidizer comprises one of oxygen, chlorine and fluorine. In paragraph 6, A battery cell characterized in that the above-mentioned auxiliary agent is stored inside the center pin. In paragraph 6, A battery cell characterized in that a storage unit is coupled to the center pin, and the auxiliary agent is stored in the storage unit. In Article 10, A battery cell characterized in that the storage unit is manufactured by including at least one of vinyl, plastic, and rubber. A battery pack comprising at least one battery cell according to any one of claims 1 to 11. A vehicle comprising at least one battery cell according to any one of claims 1 to 11.

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