WO2025028802A1 - 원통형 배터리 셀 및, 이를 포함하는 배터리 팩 및 자동차 및, 집전판 - Google Patents
원통형 배터리 셀 및, 이를 포함하는 배터리 팩 및 자동차 및, 집전판 Download PDFInfo
- Publication number
- WO2025028802A1 WO2025028802A1 PCT/KR2024/008719 KR2024008719W WO2025028802A1 WO 2025028802 A1 WO2025028802 A1 WO 2025028802A1 KR 2024008719 W KR2024008719 W KR 2024008719W WO 2025028802 A1 WO2025028802 A1 WO 2025028802A1
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- WO
- WIPO (PCT)
- Prior art keywords
- collector plate
- cylindrical battery
- battery cell
- plate
- current collector
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/574—Devices or arrangements for the interruption of current
- H01M50/578—Devices or arrangements for the interruption of current in response to pressure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/20—Pressure-sensitive devices
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a cylindrical battery cell, a battery pack and a vehicle including the same, and a current collector, and more specifically, to a cylindrical battery cell capable of reducing the internal pressure of the cylindrical battery cell, a battery pack and a vehicle including the same, and a current collector.
- Secondary batteries which have high applicability according to product group and electrical characteristics such as high energy density, are widely used in portable devices as well as electric vehicles (EVs) and hybrid electric vehicles (HEVs) driven by electrical power sources.
- EVs electric vehicles
- HEVs hybrid electric vehicles
- the types of secondary batteries widely used today 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 is approximately 2.5 V to 4.5 V.
- a battery module or a battery pack is configured by connecting multiple battery cells in series.
- a battery module or a battery pack is configured by connecting multiple battery cells in parallel according to the required charge/discharge capacity. Therefore, the number of battery cells included in the battery module or the battery pack and the electrical connection type can be variously set according to at least one of the required output voltage and charge/discharge capacity.
- cylindrical battery cells As types of secondary battery cells, cylindrical, square, and pouch-shaped battery cells are known.
- a separator which is an insulator, is interposed between the positive and negative plates, and this is wound to form a jelly-roll-shaped electrode assembly, which is then inserted into a battery can together with an electrolyte to form a battery.
- a current collector plate may be used in the cylindrical battery cell to electrically connect each of the positive and negative plates.
- Cylindrical battery cells have an internal pressure that increases as gas is generated inside the electrode assembly through repeated charge and discharge cycles. If this internal pressure is not reduced, an explosion may occur. Therefore, venting sections can be formed in various ways in cylindrical battery cells.
- the technical problem to be solved by the present invention is to provide a cylindrical battery cell, and a battery pack and vehicle including the same, and a collector plate capable of reducing the internal pressure by changing the shape of the collector plate when gas is generated inside the cylindrical battery cell and the internal pressure increases, thereby preventing an explosion.
- a cylindrical battery cell including: an electrode assembly having a structure in which a positive electrode plate, a negative electrode plate, and a separator interposed between the positive electrode plate and the negative electrode plate are wound in one direction; a cylindrical battery can in which the electrode assembly is accommodated and a through hole is formed; a positive electrode collector plate electrically connected to the positive electrode plate; a cell terminal connected to the positive electrode collector plate through the through hole of the battery can; and a negative electrode collector plate electrically connected to the negative electrode plate, wherein a break-inducing portion is formed on the positive electrode collector plate or the negative electrode collector plate so that at least a portion of the positive electrode collector plate or the negative electrode collector plate is broken by gas generated inside the battery can.
- the positive electrode collector plate or the negative electrode collector plate may include a frame portion defining a frame; a central portion spaced from the frame portion and coupled with the electrode assembly; and a connecting portion connecting the frame portion and the central portion.
- the fracture-inducing portion may be formed in the connecting portion.
- the fracture-inducing portion may be formed in the connecting portion at a portion where the central portion and the connecting portion meet.
- the fracture inducing portion may be formed as a notching groove.
- the fracture inducing portion may be formed as a through hole.
- the number of connecting portions is four, and the notching grooves can be formed in pairs, one for each connecting portion, for a total of eight.
- the notching groove may be formed toward the inside of the connecting portion in a direction that gradually or continuously reduces the width or thickness of the connecting portion.
- the fracture-inducing portion may be configured to include a twist portion formed by twisting the connecting portion.
- the twisted portion may include a first portion connected to the central portion; and a second portion twisted and folded from the first portion and then joined to the edge portion.
- the twist portion may be formed into a curved shape so as to rotate the gas.
- the twist portion may be configured such that the connecting portion is rotated 180 degrees from the center and joined to the edge portion.
- a battery pack including at least one cylindrical battery cell as described above can be provided, and further, a vehicle including at least one cylindrical battery cell as described above can be provided.
- a current collector plate for electrically connecting an electrode assembly located at a portion where a venting portion is formed in a cylindrical battery cell, the current collector plate including a rim portion defining a rim; a center portion spaced from the rim portion and coupled with the electrode assembly; and a connecting portion connecting the rim portion and the center portion, characterized in that a breakage-inducing portion is formed on the current collector plate so that at least a portion of the current collector plate is broken by a gas generated in the cylindrical battery cell.
- Embodiments of the present invention have the effect of reducing the internal pressure by changing the shape of the current collector plate when gas is generated inside the cylindrical battery cell and the internal pressure increases.
- FIG. 1 is a perspective view of a cylindrical battery cell according to one embodiment of the present invention.
- FIG. 2 is a cross-sectional view of a cylindrical battery cell according to one embodiment of the present invention.
- FIG. 3 is a drawing illustrating a battery can in a cylindrical battery cell according to one embodiment of the present invention.
- FIG. 4 is a perspective view of a negative electrode collector plate of a cylindrical battery cell according to one embodiment of the present invention.
- FIGS. 5 to 10 are each a perspective view of a negative electrode collector plate according to a modified embodiment of FIG. 4.
- Figure 11 is a perspective view showing a deformed shape of the negative electrode collector plate of Figure 10.
- FIG. 12 is a drawing schematically showing the configuration of a battery pack including a cylindrical battery cell according to each embodiment of the present invention.
- FIG. 13 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.
- each component or a specific part of the component is exaggerated, omitted, or schematically illustrated for convenience and clarity of explanation. Therefore, the size of each component does not entirely reflect the actual size. If it is judged that a specific description of a related known function or configuration may unnecessarily obscure the gist of the present invention, such description will be omitted.
- 'joint' or 'connection' as used herein includes not only cases where one member and another member are directly joined or directly connected, but also cases where one member is indirectly joined or indirectly connected to another member through a connecting member.
- FIG. 1 is a perspective view of a cylindrical battery cell according to an embodiment of the present invention
- FIG. 2 is a cross-sectional view of a cylindrical battery cell according to an embodiment of the present invention
- FIG. 3 is a drawing illustrating a battery can in a cylindrical battery cell according to an embodiment of the present invention
- FIG. 4 is a perspective view of a negative electrode collector plate of a cylindrical battery cell according to an embodiment of the present invention.
- a cylindrical battery cell (10) includes an electrode assembly (100), a battery can (200), a positive electrode collector plate (300), a cell terminal (400), and a negative electrode collector plate (600).
- the electrode assembly (100) has a structure in which a positive electrode plate (110), a negative electrode plate (120), and a separator (130) interposed between the positive electrode plate (110) and the negative electrode plate (120) are wound in one direction.
- a center hole (140) is formed in the center of the electrode assembly (100) and can be formed in a jelly roll type.
- the electrode assembly (100) can be manufactured by winding up a laminate formed by sequentially stacking a negative electrode plate (120), a separator (130), a positive electrode plate (110), and a separator (130) at least once.
- the positive electrode plate (110) and the negative electrode plate (120) can be formed in a sheet shape.
- the electrode assembly (100) applied to the present embodiment may be a coiled type electrode assembly (100).
- an additional separator may be provided on the outer surface of the electrode assembly (100) for insulation from the battery can (200).
- the electrode assembly (100) may have a coiled structure well known in the related art without limitation.
- a positive electrode plate (110) may have a positive electrode active material applied to one or both surfaces, and a first non-coated portion (111, see FIG. 2) on which a positive electrode active material is not applied may be formed at an end of the positive electrode plate (110).
- FIG. 2 illustrates a positive electrode plate (110) on which a first non-coated portion (111) is formed
- a cylindrical battery cell (10) according to an embodiment of the present invention includes an embodiment of a positive electrode plate (110) on which a first non-coated portion (111) is not formed.
- the first non-coated portion (111) may be exposed to the outside of the separator (130) 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.
- the negative plate (120) has a negative active material applied to one or both sides, and a second non-conductive portion (121, see FIG. 2) on which the negative active material is not applied may be formed at an end of the negative plate (120).
- FIG. 2 illustrates a negative plate (120) on which a second non-conductive portion (121) is formed
- the cylindrical battery cell (10) according to an embodiment of the present invention includes an embodiment of a negative plate (120) on which a second non-conductive portion (121) is not formed.
- the second non-conductive portion (121) may be exposed to the outside of the separator (130) 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.
- At least one of the positive electrode plate (110) and the negative electrode plate (120) may include a non-coated portion in which the active material is not coated on the long side end in the winding direction.
- the first non-coated portion (111) and the second non-coated portion (121) may be configured to face in opposite directions.
- the positive electrode active material coated on the positive electrode plate (110) and the negative electrode active material coated on the negative electrode plate (120) can be used without limitation as long as they are active materials known in the art.
- the separation membrane (130) 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 combination.
- 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.
- the separator (130) may use a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high-melting-point glass fiber, polyethylene terephthalate fiber, etc.
- At least one surface of the separator (130) may include a coating layer of inorganic particles. It is also possible for the separator (130) itself to be formed of a coating layer of inorganic particles. The particles forming the coating layer may have a structure in which they are combined with a binder so that an interstitial volume exists between adjacent particles.
- the center hole (140) of the electrode assembly (100) is also used for welding the cell terminal (400) (positive terminal) and the positive current collector (300). That is, the electrode assembly (100) can be configured to weld the cell terminal (400) and the positive current collector (300) by irradiating a laser through the center hole (140).
- an electrode assembly (100) is accommodated in a battery can (200).
- a through hole (211) is formed in the battery can (200).
- the battery can (200) is formed in a cylindrical shape, and the electrode assembly (100) is accommodated inside the battery can (200) and can be electrically connected to the negative electrode plate (120) of the electrode assembly (100). Accordingly, the battery can (200) can have the same polarity as the negative electrode plate (120), i.e., a negative electrode.
- 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 (300), and an insulator (500) may be interposed between the gap.
- 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 increases, but the gap between the battery can (200) and the electrode assembly (100) decreases.
- the gap between the battery can (200) and the electrode assembly (100) decreases, so in order to increase the capacity of the battery cell, an insulator (500) must be interposed between the reduced gap between the battery can (200) and the electrode assembly (100), and for this purpose, it is desirable that the thickness of the insulator (500) be as thin as possible.
- a battery can (200) may be formed with a closed portion (210) and an open portion (220) positioned so as to face each other.
- an opening (220) may be formed at the bottom of a battery can (200).
- An electrode assembly (100) is received through the opening (220) formed at the bottom of the battery can (200), and an electrolyte is also injected through the opening (220) formed at the bottom of the battery can (200).
- the battery can (200) is a roughly cylindrical container having an opening (220) formed at the bottom, and may be made of a conductive material such as metal, for example.
- 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.
- a closed portion (210) may be formed on the upper portion of the battery can (200).
- the closed portion (210) may be partially formed on the opposite side of the open portion (220).
- a through hole (211) is formed in the closed portion (210), and as in FIG. 2, a cell terminal (400) is coupled to the through hole (211) and electrically connected to the positive electrode collector plate (300) through the through hole (211).
- an insulator (500) may be interposed between the battery can (200) on the closed portion (210) side and the positive electrode collector plate (300).
- the positive electrode collector plate (300) is electrically connected to the positive electrode plate (110), and for example, referring to FIG. 2, the positive electrode collector plate (300) is connected to the positive electrode plate (110) at the upper portion of the electrode assembly (100).
- a fracture-inducing portion (700) may be formed on the positive electrode collector plate (300).
- the present specification will focus on a case where a fracture-inducing portion (700) is formed on the negative electrode collector plate (600), and a description of a case where a fracture-inducing portion (700) is formed on the positive electrode collector plate (300) will be replaced with a description of the negative electrode collector plate (600).
- the positive electrode collector plate (300) is made of a conductive metal material and is connected to the first non-conductive portion (111) of the electrode assembly (100).
- the positive electrode collector plate (300) can be connected to the upper portion of a joining surface formed by bending an end of the first non-conductive portion (111) in a direction parallel to the positive electrode collector plate (300).
- the bending direction of the first non-conductive portion (111) can be, for example, a direction toward the winding center of the electrode assembly (100).
- the space occupied by the first non-conductive portion (111) is reduced, which can lead to an improvement in energy density.
- the increase in the bonding area between the first non-conductive portion (111) and the positive electrode current collector (300) can lead to an improvement in bonding strength and a reduction in resistance.
- the cell terminal (400) is made of a conductive metal material, is coupled to a through hole (211) formed in a closed portion (210) of a battery can (200), and is electrically connected to a positive electrode collector plate (300) through the through hole (211).
- the cell terminal (400) is electrically connected to a positive electrode plate (110) of an electrode assembly (100) through the positive electrode collector plate (300), and thus has a positive polarity.
- the cell terminal (400) can function as a positive terminal.
- the battery can (200) is electrically connected to the negative plate (120) of the electrode assembly (100), thereby having a negative polarity.
- the negative electrode collector plate (600) is electrically connected to the negative electrode plate (120).
- a fracture-inducing portion (700) may be formed on the negative electrode collector plate (600).
- a detailed description of the fracture-inducing portion (700) will be described later.
- the negative electrode collector plate (600) is connected to the second non-conductive portion (121) of the electrode assembly (100).
- the negative electrode collector plate (600) is coupled to the lower portion of the electrode assembly (100).
- the negative electrode collector plate (600) 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 (121) of the negative electrode plate (120).
- the negative electrode collector plate (600) 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 (600) can be interposed and fixed between the inner surface of the battery can (200) and the sealing gasket (260).
- At least a portion of the edge portion of the negative current collector (600) may be supported by the lower surface of the bead portion (240) formed at the lower end of the battery can (200) and fixed to the bead portion (240) by welding. In a modified embodiment, at least a portion of the edge portion of the negative current collector (600) may be directly welded to the inner wall surface of the battery can (200).
- At least a portion of the remaining portion, excluding the joining portion of the beading portion (240) of the negative electrode collector plate (600), can be joined to the folded surface of the second non-conductive portion (121) by welding, for example, laser welding.
- the negative electrode collector plate (600) may have at least a portion of its edge electrically coupled to a surface adjacent to the crimping portion (250) among the upper and lower surfaces of the beading portion (240).
- the cap plate (230) is configured to seal the opening (220, see FIG. 3) formed at the bottom of the battery can (200).
- the cap plate (230) may be made of, for example, a metal material to ensure rigidity.
- the cap plate (230) may be provided as non-polar by being separated from the electrode assembly (100). That is, even if the cap plate (230) is provided as a conductive metal material, it may not have polarity.
- cap plate (230) does not have polarity means that the cap plate (230) is electrically insulated from the battery can (200) and the cell terminal (400). As such, the cap plate (230) does not have to have polarity, and its material does not necessarily have to be a conductive metal.
- the cap plate (230) may be supported by being seated on the beading portion (240) formed in the battery can (200). In addition, the cap plate (230) is fixed by the crimping portion (250). A sealing gasket (260) may be interposed between the cap plate (230) and the crimping portion (250) of the battery can (200) to ensure airtightness of the battery can (200). That is, the sealing gasket (260) may be arranged to be interposed between the edge of the cap plate (230) and the opening portion (220) of the battery can (200).
- a beading portion (240) and a crimping portion (250) can be formed at the bottom of the battery can (200).
- the beading portion (240) is formed by pressing the outer peripheral surface of the battery can (200) inwardly in an area adjacent to the opening (220) of the battery can (200).
- the beading portion (240) supports the electrode assembly (100) so that the electrode assembly (100) having a size roughly corresponding to the width of the battery can (200) does not escape through the opening (220) formed at the bottom of the battery can (200), and can also function as a support on which the cap plate (230) is secured.
- the beading portion (240) can support the outer peripheral surface of the sealing gasket (260).
- the crimping portion (250) is provided to extend and bend inwardly of the battery can (200) to wrap around and secure the edge of the cap plate (230) together with the sealing gasket (260).
- the crimping portion (250) is formed at the bottom of the battery can (200) based on the arrangement of the battery can (200). For example, when the battery can (200) is arranged such that the cell terminal (400) is positioned at the top as in FIG. 2, the crimping portion (250) is formed at the bottom of the battery can (200) based on FIG. 2.
- the crimping portion (250) is formed at the bottom of the beading portion (240).
- the present invention does not exclude a case where the battery can (200) does not have at least one of the beading portion (240) and the crimping portion (250).
- fixing of the electrode assembly (100) or fixing of the cap plate (230) or sealing of the battery can (200) can be realized through at least one of additional application of a component that can function as a stopper for the electrode assembly (100), additional application of a structure on which the cap plate (230) can be secured, and welding between the battery can (200) and the cap plate (230).
- the crimping portion (250) is formed at the lower portion of the beading portion (240).
- the crimping portion (250) has an extended and bent shape to wrap around the edge of the cap plate (230) positioned at the lower portion of the beading portion (240).
- the cap plate (230) is fixed on the beading portion (240) by the shape of the folded crimping portion (250).
- the battery can (200) of the present invention may not have at least one of the beading portion (240) and the crimping portion (250), in which case, the sealing gasket (260) may be interposed between the structure for fixing provided on the opening portion (220) side of the battery can (200) and the cap plate (230) to secure the airtightness of the battery can (200).
- the applicant's published patent KR 10-2019-0030016 A discloses a cylindrical battery cell in which the beading portion (240) is omitted, and such a structure may be adopted in the present invention.
- a vent notch (231) may be formed in the cap plate (230) so that it ruptures when the pressure inside the battery can (200) exceeds a critical value.
- the vent notch (231) may be formed on both sides of the cap plate (230), and may be formed in at least one pattern among a continuous circular pattern, a discontinuous circular pattern, and a linear pattern on the surface of the cap plate (230).
- the vent notch (231) may be formed in various other patterns.
- the vent notch (231) is formed at the bottom of the battery can (200) based on the arrangement of the battery can (200) of FIG. 2, and may be arranged so that gas inside the battery can (200) is discharged through the bottom of the battery can (200) when the vent notch (231) is ruptured.
- the vent notch (231) may be formed at the bottom of the battery can (200) based on FIG. 2.
- the vent notch (231) may be formed as an area having a thinner thickness compared to the surrounding area of the cap plate (230).
- the vent notch (231) is thinner than the surrounding area and thus may be more easily broken than the surrounding area, and when the internal pressure of the battery can (200) increases above a certain level, the vent notch (231) may be broken and gas generated inside the battery can (200) may be discharged.
- vent notch (231) may be formed by partially reducing the thickness of the battery can (200) through notching on one side or both sides of the cap plate (230).
- a cylindrical battery cell (10) may have a structure in which both a positive terminal and a negative terminal exist at the upper portion as shown in FIG. 2, and as a result, the upper structure is more complex than the lower structure.
- a vent notch (231) may be formed in the cap plate (230) forming the lower surface of the cylindrical battery cell (10) to smoothly discharge gas generated inside the battery can (200).
- a cylindrical battery cell (10) is placed directly under the driver's seat in an electric vehicle, there may be a risk of a safety accident for the driver if the gas is discharged upward.
- the gas is discharged to the bottom of the battery can (200) as in the cylindrical battery cell (10) according to one embodiment of the present invention, the above problem does not occur even if the cylindrical battery cell (10) is placed directly under the driver's seat in an electric vehicle.
- the fracture inducing part (700) may be formed on a collector plate positioned in the direction in which gas is discharged. That is, the fracture inducing part (700) may be formed on a collector plate that electrically connects an electrode assembly (100) located in a portion where a venting part is formed in a cylindrical battery cell (10).
- the venting portion is a vent notch (231) formed in the cap plate (230), and in this case, the fracture-inducing portion (700) can be formed in the negative electrode collector plate (600) located at the portion where the vent notch (231) is formed.
- a fracture-inducing portion (700) is formed in the negative current collector plate (600) disposed at the bottom.
- the fracture-inducing portion (700) may be formed in the positive current collector plate (300).
- the fracture-inducing portion (700) may be formed on the positive collector plate (300) or the negative collector plate (600).
- the fracture-inducing portion (700) is formed on the negative collector plate (600), so for convenience of explanation, the following description will focus on the case where the fracture-inducing portion (700) is formed on the negative collector plate (600).
- the embodiment where the fracture-inducing portion (700) is formed on the positive collector plate (300) is replaced with the description of the embodiment where the fracture-inducing portion (700) is formed on the negative collector plate (600).
- the fracture inducing portion (700) is formed on the negative electrode collector plate (600) and is configured so that at least a portion of the negative electrode collector plate (600) is fractured by gas generated inside the battery can (200).
- the negative electrode collector plate (600) is positioned between the center hole (140) of the electrode assembly (100) and the cap plate (230), so that when gas generated inside the battery can (200) moves toward the cap plate (230) through the center hole (140), the movement is impeded by the negative electrode collector plate (600).
- a cylindrical battery cell (10) is configured such that a fracture-inducing portion (700) is formed on a negative electrode current collector (600) so that the negative electrode current collector (600) is fractured by the internal pressure of a battery can (200).
- the negative electrode collector plate (600) may be configured to include a rim portion (610), a center portion (620), and a connection portion (630).
- the negative electrode collector plate (600) is illustrated as viewed from the opposite direction to FIG. 2. That is, in the case of FIG. 2, the center portion (620) is positioned above the rim portion (610), but in FIG. 4, the center portion (620) is positioned below the rim portion (610). This also applies to FIGS. 5 to 11 below.
- the rim (610) defines a rim, and may have an approximate rim shape in which at least a portion of the inner area is empty to form an inner space.
- the rim (610) is illustrated as having an approximately circular rim shape, but the shape of the rim (610) is not limited thereto. Unlike what is illustrated, the rim (610) may have an approximately square rim shape, a hexagonal rim shape, an octagonal rim shape, or other shapes.
- the rim (610) may be coupled to the connecting portion (630).
- the central portion (620) is located on the inner side of the rim portion (610) and is spaced apart from the rim portion (610). For example, the central portion (620) may be located at the exact center of the inner space of the rim portion (610), but is not limited thereto.
- the central portion (620) is coupled to the connecting portion (630) and is connected to the rim portion (610) by the connecting portion (630).
- the central portion (620) is coupled to the electrode assembly (100).
- the central portion (620) may be positioned at a position corresponding to the central hole (140) of the electrode assembly (100).
- the connecting portion (630) connects the edge portion (610) and the center portion (620).
- a plurality of connecting portions (630) may be provided, and the plurality of connecting portions (630) may be spaced apart from each other. In Fig. 4, four connecting portions (630) are provided, but the number of connecting portions (630) is not limited thereto. In addition, the plurality of connecting portions (630) may be arranged at equal intervals from each other, but is not limited thereto.
- the fracture inducing portion (700) may be formed at various locations, for example, at the connecting portion (630). As one embodiment, as shown in FIG. 4, the fracture inducing portion (700) may be formed at the connecting portion (630) at the point where the center portion (620) and the connecting portion (630) meet. However, the fracture inducing portion (700) does not have to be formed only at the point where the center portion (620) and the connecting portion (630) meet, and may be formed at any point of the connecting portion (630).
- the fracture-inducing portion (700) may be formed as a groove, for example, a notching groove (710), in which the width of the connecting portion (630) narrows at the point where the center portion (620) and the connecting portion (630) meet.
- the notching groove (710) may be formed toward the inside of the connecting portion (630) in a direction (left and right direction of the connecting portion (630)) that gradually or continuously reduces the width of the connecting portion (630). That is, the notching groove (710) may be formed in the width direction from the outer end of the connecting portion (630) toward the inside.
- the outer end of the connecting portion (630) is toward the edge portion (610), and the inner end of the connecting portion (630) is toward the center (620).
- the shape of the notching home (710) may vary. In Fig. 4, it is formed in a triangular shape, but is not limited thereto and may have a wider variety of shapes.
- the fracture inducing portion (700) may be provided in a pair and formed at each end of the connecting portion (630).
- the connecting portion (630) may be four, and the notching grooves (710) may be formed in a pair for each connecting portion (630), for a total of eight, but this is not limited thereto.
- a fracture-inducing portion (700) such as a notched groove (710) is formed in the connecting portion (630)
- a fracture occurs in the connecting portion (630) along the notched groove (710), and the central portion (620) coupled to the electrode assembly (100) can also be easily removed.
- the gas inside the battery can (200) moves toward the cap plate (230) through the center hole (140) and ruptures the vent notch (231) formed in the cap plate (230).
- the gas inside the battery can (200) can be easily discharged from the battery can (200).
- FIGS. 5 to 10 are each a perspective view of a negative electrode collector plate according to a modified embodiment of FIG. 4, and FIG. 11 is a perspective view of a shape of the negative electrode collector plate of FIG. 10 that has been modified.
- the fracture inducing portion (700) may be formed as a groove, for example, a notched groove (710), as in FIG. 4.
- the groove is formed in a form in which the width (left-right direction) of the connecting portion (630) becomes narrower
- the groove is formed in a form in which the thickness (up-down direction) of the connecting portion (630) becomes narrower. That is, the notched groove (710) may be formed by being drawn inward toward the inside of the connecting portion (630) in a direction in which the thickness of the connecting portion (630) is gradually or continuously reduced.
- the notching groove (710) may be formed at the upper and lower portions of the connection portion (630) at the point where the center (620) and the connection portion (630) meet. Likewise, even when the notching groove (710) is formed as a groove in which the thickness of the connection portion (630) is narrowed, the connection portion (630) may be broken along the notching groove (710) due to the internal pressure of the battery can (200).
- the fracture inducing portion (700) may be formed as a through hole (720).
- the through hole (720) may be formed in any part of the connecting portion (630).
- the through hole (720) may be formed in the middle of the connecting portion (630), or may be formed in the connecting portion (630) at a part where the center (620) and the connecting portion (630) meet.
- the number of through holes (720) may vary.
- one through hole (720) is illustrated in one connection portion (630), but this is only one embodiment, and the number of through holes (720) formed in one connection portion (630) may vary.
- the through hole (720) may have various shapes.
- a circular through hole (720) is illustrated in the connecting portion (630), but this is only one embodiment, and the shape of the through hole (720) may be various, such as an oval, a triangle, or a square.
- the fracture inducing part (700) further has a notched groove (710) formed in a circular through hole (720). That is, a pair of triangular notched grooves (710) are formed toward the outside from the circumference of the circular through hole (720).
- the pair of notched grooves (710) may be formed to face opposite directions.
- the shapes of the through hole (720) and the notched groove (710) may vary.
- the fracture inducing portion (700) may be configured to include a twisted portion (730) formed by twisting the connecting portion (630).
- the twisted portion (730) may be formed by cutting the portion of the connecting portion (630) that is joined to the edge portion (610), twisting it so that the opposite surface (bottom surface) is positioned upward, and welding it to the edge portion (610).
- the degree of welding can be adjusted to induce a break so that the edge portion (610) and the connecting portion (630) can be easily broken.
- a cut portion or a groove (for example, a notching groove) can be formed at the portion where the edge portion (610) and the twisted portion (730) meet, thereby making it easier to break the edge portion (610) and the connecting portion (630).
- the twisted portion (730) may be configured to include a first portion (731) and a second portion (732).
- the first portion (731) is connected to the center portion (620).
- the second portion (732) is twisted and folded from the first portion (731) and then connected to the edge portion (610).
- the welding degree can be adjusted, or a cut portion or groove (e.g., a notching groove) can be formed to facilitate the fracture of the edge portion (610) and the connecting portion (630) by gas.
- a cut portion or groove e.g., a notching groove
- the embodiment of Fig. 8 facilitates the rupture of the edge portion (610) and the connection portion (630) provided on the negative electrode collector plate (600), thereby facilitating gas discharge, and thereby implementing internal pressure and explosion prevention.
- it also has the effect of reducing the explosive power caused by the gas by consuming the energy possessed by the gas and evenly distributing the force through the rotation of the gas through the twisting portion (730).
- FIG. 9 is a modified embodiment of FIG. 8 in which the twisting portion (730) is formed in a curved shape so as to rotate gas.
- the twisting portion (730) may have various types of curved shapes, and for example, referring to FIG. 9, the twisting portion (730) may be configured such that the connecting portion (630) rotates 180 degrees from the center (620) and is coupled to the edge portion (610).
- a notching groove (710) may be formed in the second part (732) of the twisted part (730).
- Fig. 9 is more advantageous in gas rotation than the embodiment of Fig. 8.
- the embodiment of Fig. 8 and the embodiment of Fig. 9 may be appropriately selected as needed.
- the fracture inducing portion (700) is formed as a groove, for example, a notched groove (710).
- the thickness (upper and lower direction) of the connecting portion (630) is formed as a groove in a shape that is narrower.
- the notched grooves (710) are provided as a pair and formed on both the upper and lower portions of the connecting portion (630), but in Fig. 10, the notched grooves (710) are formed only on the upper portion of the connecting portion (630), which is different.
- the center portion (620) of the negative electrode current collector (600) moves in the opposite direction (see the arrow in Fig. 11) due to the gas inside the battery can (200) as in Fig. 11.
- the center portion (620) flips in the opposite direction as such the gas inside the battery can (200) is easily discharged.
- the center portion (620) and the connection portion (630) may eventually be broken.
- the center portion (620) of the negative electrode current collector (600) may flip in the opposite direction due to the gas inside the battery can (200) as in Fig. 10.
- FIG. 12 is a drawing schematically showing the configuration of a battery pack including a cylindrical battery cell according to each embodiment of the present invention.
- a battery pack (20) may include one or more cylindrical battery cells (10) according to one embodiment of the present invention as described above.
- the battery pack (20) may further include a pack housing (200) for storing the cylindrical battery cells (10), and various devices for controlling charging and discharging of the cylindrical battery cells (10), such as a BMS, a current sensor, and a fuse.
- FIG. 13 is a drawing for explaining a vehicle including a battery pack according to each embodiment of the present invention.
- a vehicle (30) may include one or more cylindrical battery cells (10) or battery packs (20) according to each of the above-described embodiments.
- the vehicle (30) includes various types of vehicles that are designed to use electricity, such as electric vehicles or hybrid vehicles, for example.
- the present invention relates to a cylindrical battery cell, a battery pack including the same, and an automobile and a current collector, and is particularly applicable to industries related to secondary batteries.
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Secondary Cells (AREA)
Abstract
Description
Claims (15)
- 양극판, 음극판 및 상기 양극판과 상기 음극판 사이에 개재된 분리막이 일 방향으로 권취된 구조를 가지는 전극 조립체;상기 전극 조립체가 수납되고 관통홀이 형성된 원통형의 전지 캔;상기 양극판과 전기적으로 연결되는 양극 집전판;상기 전지 캔의 관통 홀을 통해 상기 양극 집전판과 연결되는 셀 단자; 및상기 음극판과 전기적으로 연결되는 음극 집전판을 포함하며,상기 전지 캔 내부에서 발생한 가스에 의해 상기 양극 집전판 또는 상기 음극 집전판의 적어도 일부분이 파단되도록 상기 양극 집전판 또는 상기 음극 집전판에 파단유도부가 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제1항에 있어서,상기 양극 집전판 또는 상기 음극 집전판은,테두리를 규정하는 테두리부;상기 테두리부로부터 이격되며, 상기 전극 조립체와 결합되는 중심부; 및상기 테두리부와 상기 중심부를 연결하는 연결부를 포함하는 것을 특징으로 하는 원통형 배터리 셀.
- 제2항에 있어서,상기 파단유도부는,상기 연결부에 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제2항에 있어서,상기 파단유도부는,상기 중심부와 상기 연결부가 만나는 부분에서 상기 연결부에 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제1항에 있어서,상기 파단유도부는 노칭홈으로 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제1항에 있어서,상기 파단유도부는 관통공으로 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제5항에 있어서,상기 연결부는 4개이며,상기 노칭홈은 하나의 상기 연결부에 한 쌍씩 모두 8개가 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제5항에 있어서,상기 노칭홈은 상기 연결부의 폭 또는 두께를 단계적 또는 연속적으로 감소시키는 방향으로 상기 연결부의 내측을 향해 인입 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제2항에 있어서,상기 파단유도부는 상기 연결부가 뒤틀려 형성되는 뒤틀림부를 포함하여 구성되는 것을 특징으로 하는 원통형 배터리 셀.
- 제9항에 있어서,상기 뒤틀림부는,상기 중심부에 연결되는 제1 부; 및상기 제1 부로부터 뒤틀려서 접힌 후 상기 테두리부에 결합되는 제2 부를 포함하는 것을 특징으로 하는 원통형 배터리 셀.
- 제9항에 있어서,상기 뒤틀림부는 가스를 회전시킬 수 있도록 곡선 형상으로 형성된 것을 특징으로 하는 원통형 배터리 셀.
- 제11항에 있어서,상기 뒤틀림부는 상기 연결부가 상기 중심부로부터 180도 회전하여 상기 테두리부에 결합되록 구성되는 것을 특징으로 하는 원통형 배터리 셀.
- 제1항 내지 제12항 중 어느 한 항에 따른 원통형 배터리 셀을 적어도 하나 포함하는 배터리 팩.
- 제1항 내지 제12항 중 어느 한 항에 따른 원통형 배터리 셀을 적어도 하나 포함하는 자동차.
- 원통형 배터리 셀에서 벤팅부가 형성된 부분에 위치한 전극 조립체를 전기적으로 연결하는 집전판으로서,테두리를 규정하는 테두리부;상기 테두리부로부터 이격되며, 상기 전극 조립체와 결합되는 중심부; 및상기 테두리부와 상기 중심부를 연결하는 연결부를 포함하며,상기 원통형 배터리 셀에서 발생한 가스에 의해 상기 집전판의 적어도 일부분이 파단되도록 상기 집전판에 파단유도부가 형성된 것을 특징으로 하는 집전판.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP24849373.6A EP4664665A1 (en) | 2023-07-28 | 2024-06-24 | Cylindrical battery cell, battery pack and vehicle including same, and current collector plate |
| CN202480008467.2A CN120569852A (zh) | 2023-07-28 | 2024-06-24 | 圆柱形电池电芯、包括其的电池组和车辆、以及集电板 |
| MX2025012150A MX2025012150A (es) | 2023-07-28 | 2025-10-10 | Celda de bateria cilindrica, paquete de baterias y vehiculo que los incluye, y placa colectora |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2023-0099233 | 2023-07-28 | ||
| KR1020230099233A KR20250018036A (ko) | 2023-07-28 | 2023-07-28 | 원통형 배터리 셀 및, 이를 포함하는 배터리 팩 및 자동차 및, 집전판 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2025028802A1 true WO2025028802A1 (ko) | 2025-02-06 |
Family
ID=94395142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2024/008719 Pending WO2025028802A1 (ko) | 2023-07-28 | 2024-06-24 | 원통형 배터리 셀 및, 이를 포함하는 배터리 팩 및 자동차 및, 집전판 |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4664665A1 (ko) |
| KR (1) | KR20250018036A (ko) |
| CN (1) | CN120569852A (ko) |
| MX (1) | MX2025012150A (ko) |
| WO (1) | WO2025028802A1 (ko) |
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| KR20190030016A (ko) | 2017-09-13 | 2019-03-21 | 주식회사 엘지화학 | 비딩부가 생략된 원통형 전지셀 |
| KR20230058299A (ko) * | 2021-10-22 | 2023-05-03 | 주식회사 엘지에너지솔루션 | 원통형 배터리, 그리고 이를 포함하는 배터리 팩 및 자동차 |
| KR20230099233A (ko) | 2021-12-27 | 2023-07-04 | 한국전력공사 | 전력계통 모의시험 장치 및 그 방법 |
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| KR20250018036A (ko) | 2025-02-04 |
| EP4664665A1 (en) | 2025-12-17 |
| MX2025012150A (es) | 2025-11-03 |
| CN120569852A (zh) | 2025-08-29 |
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