WO2024258153A1 - 배터리 셀, 그리고 이를 포함하는 배터리 팩 및 자동차 - Google Patents
배터리 셀, 그리고 이를 포함하는 배터리 팩 및 자동차 Download PDFInfo
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- WO2024258153A1 WO2024258153A1 PCT/KR2024/007984 KR2024007984W WO2024258153A1 WO 2024258153 A1 WO2024258153 A1 WO 2024258153A1 KR 2024007984 W KR2024007984 W KR 2024007984W WO 2024258153 A1 WO2024258153 A1 WO 2024258153A1
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- Prior art keywords
- battery cell
- cid
- electrode assembly
- terminal
- current collector
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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
- H01M50/583—Devices or arrangements for the interruption of current in response to current, e.g. fuses
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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
- H01M50/543—Terminals
- H01M50/552—Terminals characterised by their shape
- H01M50/559—Terminals adapted for cells having curved cross-section, e.g. round, elliptic or button cells
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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
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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
- H01M50/147—Lids or covers
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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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape 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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/183—Sealing members
- H01M50/184—Sealing members characterised by their shape or structure
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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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
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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
- H01M50/20—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
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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
- H01M50/20—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
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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
- H01M50/30—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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
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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
- H01M50/543—Terminals
- H01M50/564—Terminals characterised by their manufacturing process
- H01M50/567—Terminals characterised by their manufacturing process by fixing means, e.g. screws, rivets or bolts
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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
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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
- H01M50/581—Devices or arrangements for the interruption of current in response to temperature
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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
- 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
Definitions
- the present invention relates to a battery cell, a battery pack including the same, and a vehicle.
- the fuse devices currently used in secondary batteries include PTC thermistors (positive temperature coefficient thermistors) and TCOs (thermal cut-outs).
- PTC thermistors positive temperature coefficient thermistors
- TCOs thermo cut-outs
- PTC and TCOs have a disadvantage in that their own resistance increases as they are repeatedly operated, thereby increasing the overall resistance of the circuit.
- the above-mentioned devices are operated by heat generation due to overcurrent.
- the above-mentioned devices are devices that operate to block the flow of current only when overcurrent occurs in the circuit current path due to overcharging, etc., and the temperature rises as a result.
- a secondary battery that can be used in an environment where high current flows, and that has a structure that can cut off the current in advance when an event that could cause a temperature rise (e.g., an increase in the internal pressure of a secondary battery) occurs before the temperature rises to a level that could cause a safety problem.
- a temperature rise e.g., an increase in the internal pressure of a secondary battery
- the present invention has been created in consideration of the above-described problems, and has as its primary purpose the provision of a battery cell having a structure capable of quickly cutting off current when an abnormality occurs in the battery cell, and a battery pack and an automobile including the same.
- a battery cell includes: an electrode assembly; a housing having an opening formed on one side to accommodate the electrode assembly and a closing portion formed on an opposite side of the opening portion; a current collector disposed between the electrode assembly and the closing portion and electrically coupled to the electrode assembly; a terminal electrically coupled to the electrode assembly through the closing portion; and a CID interposed between the terminal and the current collector and coupled to the current collector with a greater bonding force than the terminal.
- the area of the bonding surface between the CID and the current collector may be wider than the area of the bonding surface between the CID and the terminal.
- the bonding surface formed at the lower end of the above terminal may be provided at a position corresponding to the winding center hole of the electrode assembly.
- the above CID can be coupled to the current collector on the inner and outer sides of the region corresponding to the winding center hole.
- the above-described current collector may include a first coupling portion electrically coupled to the electrode assembly; and a second coupling portion positioned spaced apart from the first coupling portion along a radial direction of the electrode assembly and provided at a position corresponding to a winding center hole of the electrode assembly.
- the above CID can be coupled with both the first coupling portion and the second coupling portion.
- the above CID can be configured to cover both the first coupling portion and the second coupling portion along the radial direction of the electrode assembly.
- the above battery cell may include a CID gasket interposed between the closure and the current collector, and which maintains a separation state when a separation occurs between the closure and the current collector due to an increase in pressure inside the housing.
- the above CID gasket may be configured to have elastic restoring force in the direction of expansion between the closing portion and the collector.
- the above CID gasket may be configured to expand as the temperature inside the housing increases.
- the above CID gasket may be interposed, at least in part, between the CID and the closure.
- the above battery cell may include a battery cap configured to cover the opening.
- the above battery cap may have a venting portion configured to be vulnerable compared to the surroundings.
- the joint between the terminal and the CID may be configured to rupture at a pressure lower than the venting pressure of the venting portion.
- a battery pack includes a battery cell of the present invention.
- a vehicle includes a battery pack of the present invention.
- the current can be cut off in advance before venting of the battery cell occurs, thereby further improving the safety of using the secondary battery.
- FIG. 1 is a partial cross-sectional view showing the upper portion structure of a battery cell according to one embodiment of the present invention.
- FIG. 2 is a drawing for explaining the fracture of the joint between parts as the internal pressure of the battery cell illustrated in FIG. 1 increases.
- FIG. 3 is a drawing for explaining a phenomenon in which, when the CID of the present invention is omitted in the battery cell illustrated in FIGS. 1 and 2, the joint portion of the terminal and the current collector moves together without breaking as the terminal rises.
- FIG. 4 is a drawing for explaining a phenomenon in which the joining portion of a terminal and a CID is broken as the terminal rises when the CID of the present invention is applied to the battery cell illustrated in FIGS. 1 and 2.
- FIG. 5 is a drawing showing a battery cell to which a current collector of a different type from the current collector illustrated in FIG. 1 is applied.
- FIG. 6 is a drawing for explaining the fracture of the joint between parts as the internal pressure of the battery cell illustrated in FIG. 5 increases.
- FIGS. 7 and 8 are drawings showing exemplary forms of current collectors applied to the battery cells illustrated in FIGS. 5 and 6.
- FIG. 9 is a drawing for explaining a phenomenon in which, when the CID of the present invention is omitted in the battery cell illustrated in FIGS. 5 and 6, the joint portion of the terminal and the current collector moves together without breaking as the terminal rises.
- FIG. 10 is a drawing for explaining a phenomenon in which, in the battery cell illustrated in FIGS. 5 and 6, when the CID of the present invention is connected only to the second connecting portion of the current collector, the connecting portion of the terminal and the CID moves together without breaking as the terminal rises.
- FIG. 11 is a drawing for explaining a phenomenon in which the joining portion of a terminal and a CID is broken as the terminal rises when the CID of the present invention is joined to both the first joining portion and the second joining portion of a current collector in the battery cell illustrated in FIGS. 5 and 6.
- FIG. 12 is a drawing showing a battery cell to which a CID gasket is additionally applied in the battery cell illustrated in FIG. 5.
- FIG. 13 is a drawing for explaining the fracture of the joint between parts as the internal pressure of the battery cell illustrated in FIG. 12 increases.
- FIGS. 14 and 15 are drawings showing a battery cell having a structure in which the CID gasket is positioned at a different position compared to the battery cell illustrated in FIG. 12.
- Fig. 16 is a drawing showing the appearance of a battery cell of the present invention.
- Figure 17 is a drawing showing the overall internal structure of the battery cell illustrated in Figure 16.
- Fig. 18 is a partial cross-sectional view showing the lower portion structure of the battery cell of the present invention.
- FIG. 19 is a drawing showing a battery pack according to one embodiment of the present invention.
- FIG. 20 is a drawing showing a vehicle according to one embodiment of the present invention.
- FIG. 1 is a partial cross-sectional view showing the structure of the upper portion of a battery cell according to an embodiment of the present invention
- FIG. 2 is a drawing for explaining fracture of a joint portion between components as the internal pressure of the battery cell illustrated in FIG. 1 increases.
- FIG. 3 is a drawing for explaining a phenomenon in which, in the battery cell illustrated in FIGS. 1 and 2, when the CID of the present invention is omitted, the joint portion of a terminal and a current collector moves together without fracture as the terminal rises
- FIG. 4 is a drawing for explaining a phenomenon in which, in the battery cell illustrated in FIGS. 1 and 2, when the CID of the present invention is applied, the joint portion of a terminal and a CID is fractured as the terminal rises.
- a battery cell (1) may include an electrode assembly (10), a housing (20), a current collector (first current collector) (30), a terminal (40), and a CID (current interruption device) (50).
- the electrode assembly (10) may include a first electrode, a second electrode, and a separator interposed between the first electrode and the second electrode.
- the electrode assembly (10) may be, for example, a jellyroll type electrode assembly in which a laminate including the first electrode, the second electrode, and the separator is rolled in one direction.
- the electrode assembly (10) may have a first uncoated portion (11) at an upper end.
- the first uncoated portion (11) refers to a region of the first electrode where an electrode active material is not coated.
- the first uncoated portion (11) may be formed at one end of the first electrode and may extend along the rolling direction of the electrode assembly (10).
- the first uncoated portion (11) may extend upward along the height direction (the direction parallel to the Z-axis) of the electrode assembly (10).
- the housing (20) may be configured to accommodate an electrode assembly (10) through an opening provided on one side.
- the housing (20) may be provided with a closed portion formed on the opposite side of the opening portion.
- the current collector (30) may be placed between the electrode assembly (10) and the closing portion of the housing (20).
- the current collector (30) may be electrically coupled to the electrode assembly (10).
- one side of the current collector (30) may be coupled to the first non-conductive portion (11) provided at the upper end of the electrode assembly (10).
- the coupling between the current collector (30) and the electrode assembly (10) may be accomplished by, for example, laser welding, ultrasonic welding, or the like.
- the first non-woven portion (11) may have segments formed by being segmented along the winding direction of the electrode assembly (10), and these segments may be folded toward the core of the electrode assembly (10), for example.
- the folded segments of the first non-woven portion (11) may be overlapped with each other to form a plurality of layers.
- the current collector (30) may be bonded to an approximately flat surface formed by the folding of the first non-woven portion (11).
- the terminal (40) can be electrically coupled to the electrode assembly (10) through the closed portion of the housing (20).
- the terminal (40) can, for example, penetrate approximately the center of the closed portion of the housing (20).
- the terminal (40) can be secured, for example, by riveting on the inner surface of the closed portion of the housing (20).
- the CID (50) may be interposed between the terminal (40) and the current collector (30).
- the CID (50) may be a plate including a conductive metal.
- the CID (50) may have a first surface that may be coupled to the terminal (40), and a second surface that is opposite the first surface may be coupled to the current collector (30).
- the CID (50) may be coupled with a stronger bonding force to the current collector (30) than to the terminal (40). That is, the bonding force between the first surface of the CID (50) and the terminal (40) may be formed stronger than the bonding force between the second surface of the CID (50) and the current collector (30).
- the bonding portion between the terminal (40) and the CID (50) can be quickly broken when the housing (20) expands due to an increase in the internal pressure of the battery cell (1), thereby blocking the flow of current through the terminal (40).
- a phenomenon may occur in which the joint portion between the current collector (30) and the electrode assembly (10) is partially broken before the joint portion between the current collector (30) and the terminal (40) is broken, and/or a phenomenon may occur in which the joint portion between the current collector (30) and the terminal (40) is delayed in breaking as the current collector (30) bends.
- the difference in bonding strength as described above may be caused, for example, by a difference in bonding area.
- the area of the bonding surface between the CID (50) and the current collector (30) may be formed wider than the area of the bonding surface between the CID (50) and the terminal (40).
- the assembly including the electrode assembly (10), the current collector (30) and the CID (50) can be pushed through the opening of the housing (20) so that the CID (50) comes into contact with the bottom surface of the terminal (40).
- the current collector (30), the CID (50) and the terminal (40) can be welded by inserting a welding device or irradiating a laser through the winding center hole (10a) formed approximately at the center of the electrode assembly (10).
- the welding area between the CID (50) and the terminal (40) is smaller than the welding area between the current collector (30) and the CID (50)
- the fracture of the welding area between the terminal (40) and the CID (50) due to an increase in internal pressure can be quickly achieved.
- the bonding surface formed at the lower end of the terminal (40) may be provided at a position corresponding to the winding center hole (10a) of the electrode assembly (10).
- the current collector (30) cannot be bonded to the electrode assembly (10) at a position corresponding to the bonding portion of the CID (50) and the terminal (40). Therefore, when the closing portion is bent due to an increase in the internal pressure of the battery cell (1) and the terminal (40) rises accordingly, the current collector (30) may be bent in an area corresponding to the winding center hole (10a). This bending of the current collector (30) may be a cause of preventing the breakage of the bonding portion between the terminal (40) and the CID (50).
- the rigidity of the current collector (30) can be reinforced by the CID (50), and thereby the breakage of the bonding portion between the terminal (40) and the CID (50) can occur more quickly.
- the CID (50) can be coupled with the current collector (30) on the inner side (region B) and outer side (region A) of the region corresponding to the winding center hole (10a).
- the bending of the current collector (30) and the CID (50) can be further suppressed, and thus the fracture of the joint portion of the terminal (40) and the CID (50) can occur more quickly.
- the battery cell (1) of the present invention may include an insulator (IS) and/or an insulating gasket (G1).
- the insulator (IS) may be placed in a space formed between the closing portion of the housing (20) and the current collector (30).
- the insulator (IS) may include an insulating material.
- the insulator (IS) may prevent contact between the current collector (30) and the housing (20), which are configured to have different polarities.
- the insulating gasket (G1) may be interposed between the terminal (40) and the housing (20).
- the insulating gasket (G1) may include an insulating material.
- the insulating gasket (G1) may prevent contact between the terminal (40) and the housing (20), which are configured to have different polarities.
- FIG. 5 is a drawing showing a battery cell to which a current collector of a different form from that shown in FIG. 1 is applied
- FIG. 6 is a drawing for explaining fracture of a joint portion between components as the internal pressure of the battery cell shown in FIG. 5 increases.
- FIGS. 7 and 8 are drawings showing exemplary forms of current collectors applied to the battery cells shown in FIGS. 5 and 6.
- FIG. 9 is a drawing for explaining a phenomenon in which, in the battery cell shown in FIGS. 5 and 6, when the CID of the present invention is omitted, the joint portion of a terminal and a current collector moves together without fracture as the terminal rises.
- FIG. 5 is a drawing showing a battery cell to which a current collector of a different form from that shown in FIG. 1 is applied
- FIG. 6 is a drawing for explaining fracture of a joint portion between components as the internal pressure of the battery cell shown in FIG. 5 increases.
- FIGS. 7 and 8 are drawings showing exemplary forms of current collectors applied to the battery cells shown in
- FIG. 10 is a drawing for explaining a phenomenon in which, in the battery cell shown in FIGS. 5 and 6, when the CID of the present invention is connected only to the second joint portion of the current collector, the joint portion of a terminal and a CID moves together without fracture as the terminal rises.
- FIG. 11 is a drawing for explaining a phenomenon in which the connection portion of a terminal and a CID is broken as the terminal rises when the CID of the present invention is connected to both the first connection portion and the second connection portion of the current collector in the battery cell illustrated in FIGS. 5 and 6.
- the current collector (30) may include a first coupling portion (31) and a second coupling portion (32).
- the first coupling portion (31) may be electrically coupled to the electrode assembly (10).
- the first coupling portion (31) may be coupled to, for example, the first non-conductive portion (11) of the electrode assembly (10).
- the second coupling portion (32) may be positioned apart from the first coupling portion (31) along the radial direction of the electrode assembly (10).
- the second coupling portion (32) may be coupled to the terminal (40) with the CID (50) interposed therebetween.
- the first coupling portion (31) provided for coupling with the electrode assembly (10) and the second coupling portion (32) provided for coupling with the terminal (40) are not directly connected to each other but are indirectly connected. Therefore, when an impact is applied to either the welding portion formed in the first coupling portion (31) or the welding portion formed in the second coupling portion (32), the impact can be prevented from being directly transmitted to the other portion. This can reduce the risk of damage to the welding portion due to external impact.
- the second coupling portion (32) may be provided at a position corresponding to the winding center hole (10a) of the electrode assembly (10).
- the second coupling portion (32) is illustrated as having a larger size to cover the winding center hole (10a), but the present invention is not limited thereto.
- the second coupling portion (32) may have a size substantially the same as or smaller than the winding center hole (10a).
- the current collector (30) may include a connecting portion (33) configured to electrically connect the first connecting portion (31) and the second connecting portion (32).
- the connecting portion (33) may include a rim portion (33a) having a substantially rim shape with a hollow center, and a bridge portion (33b) connecting the rim portion (33a) and the second connecting portion (32).
- One or more bridge portions (33b) may be provided.
- the first connecting portion (31) may extend inward from the rim portion (33a).
- the first connecting portions (31) may be provided in plurality.
- the second connecting portion (32) may be arranged to be surrounded by a plurality of first connecting portions (31).
- the CID (50) may be coupled with both the first coupling portion (31) and the second coupling portion (32).
- the CID (50) may be configured to cover both the first coupling portion (31) and the second coupling portion (32) along the radial direction of the electrode assembly (10).
- FIG. 12 is a drawing showing a battery cell to which a CID gasket is additionally applied in the battery cell shown in FIG. 5, and
- FIG. 13 is a drawing for explaining breakage of a joint portion between parts due to an increase in the internal pressure of the battery cell shown in FIG. 12.
- FIGS. 14 and 15 are drawings showing a battery cell having a structure in which the CID gasket is positioned at a different position compared to the battery cell shown in FIG. 12.
- the battery cell (1) of the present invention may include a CID gasket (60).
- the CID gasket (60) may include an insulating material.
- the CID gasket (60) may be interposed between the closing portion of the housing (20) and the current collector (30).
- the CID gasket (60) may maintain the separation state when a separation occurs between the current collectors (30) due to an increase in pressure inside the housing (20).
- the CID gasket (60) may be configured to have an elastic restoring force in the direction of expansion between the closing portion of the housing (20) and the current collector (30).
- the CID gasket (60) may be interposed between the closing portion and the current collector (30) in a compressed state so as to have a thickness corresponding to the distance between the closing portion and the current collector (30).
- the closing portion of the housing (20) that swells upward due to an increase in internal pressure may not be restored to its original shape and may remain in a deformed state.
- the terminal (40) may rise together, and thus the joint portion between the terminal (40) and the CID (50) may be broken.
- the CID gasket (60) is applied, the terminal (40) and the CID (50) may be maintained in a state where they are separated from each other, and thus the state in which the flow of current through the terminal (40) is blocked may be maintained.
- the CID gasket (60) may be configured to expand as the temperature inside the housing (20) increases. That is, the CID gasket (60) may include a material that expands due to heat. For example, the CID gasket (60) may include a foamed resin. The CID gasket (60) may be configured to expand at a temperature at which, for example, the closing portion of the housing (20) swells upward.
- the CID gasket (60) may be positioned so that at least a portion thereof is interposed between the CID (50) and the closing portion of the housing (20).
- the CID gasket (60) When the CID gasket (60) is positioned in this manner, the joint portion between the current collector (30) and the electrode assembly (10) may be pressurized by the CID gasket (60). Accordingly, when the terminal (40) is raised, the phenomenon in which the joint portion between the current collector (30) and the electrode assembly (10) is damaged before the joint portion between the terminal (40) and the CID (50) is damaged can be prevented.
- the CID gasket (60) may be positioned entirely on the CID (50), as illustrated in FIG. 15.
- the position of the CID gasket (60) of the present invention is not limited thereto, and the entire area may be positioned entirely on the outside of the CID (50), as illustrated in FIG. 14.
- FIG. 16 is a drawing showing the appearance of the battery cell of the present invention
- FIG. 17 is a drawing showing the overall internal structure of the battery cell shown in FIG. 16
- FIG. 18 is a partial cross-sectional view showing the structure of the lower portion of the battery cell of the present invention.
- the joint portion between the terminal (40) and the CID (50) of the present invention described above may be configured to be ruptured at a pressure lower than the venting pressure of the venting portion (71), i.e., the pressure at which the venting portion (71) ruptures. This is to ensure safety in battery use by blocking the flow of current through the terminal (40) before a thermal event due to venting spreads.
- the battery cell (1) of the present invention may include a sealing gasket (G2) interposed between the battery cap (70) and the inner surface of the housing (20).
- the sealing gasket (G2) may be configured to enhance the sealing property of the housing (20).
- the battery cell (1) of the present invention may be configured such that the terminal (40) and the closing portion of the housing (20) function as a first electrode terminal and a second electrode terminal, respectively.
- the terminal (40) may be electrically connected to the first uncharged portion (11) of the electrode assembly (10) through the current collector (first current collector) (30), thereby having a first polarity.
- the housing (20) may be electrically connected to the second uncharged portion (12) of the electrode assembly (10), thereby having a second polarity.
- the second non-coated portion (12) can have segments, and the segments can be bent toward the core of the electrode assembly (10).
- the segments of the folded second plain portion (12) can be overlapped to form multiple layers. In this way, when the segments of the first plain portion (12) are folded, the second current collector (P) can be bonded to an approximately flat surface formed by the folding of the second plain portion (12).
- the second current collector (P) may be coupled to the inner surface of the housing (20).
- the housing (20) may have a beading portion (21) pressed along the outer circumference.
- the housing (20) may have a crimping portion (22) formed by extending and bending from the beading portion (21) to wrap around the edge of the battery cap (70).
- the second current collector (P) may be interposed between one surface of the beading portion (21) and the sealing gasket (G2).
- a battery pack (3) may include a battery cell (1) according to an embodiment of the present invention and a pack housing (2) accommodating the battery cell (1).
- the battery cell (1) may be provided in plurality, and the plurality of battery cells (1) may be electrically connected to each other.
- the battery cell (1) of the present invention may be configured such that the terminal (40) and the closing portion of the housing (20) may function as a first electrode terminal and a second electrode terminal, respectively (see FIG. 17 and FIG. 18). Therefore, when arranging a plurality of battery cells (1) within the pack housing (2), electrical connection may be made at the upper portion of the battery cells (1) by arranging all of the battery cells (1) with the terminals (40) facing upward.
- FIG. 20 is a drawing showing a vehicle according to one embodiment of the present invention.
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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)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (15)
- 전극 조립체;일 측에 구비되는 개방부를 통해 상기 전극 조립체를 수용하며 상기 개방부의 반대편에 형성되는 폐쇄부를 구비하는 하우징;상기 전극 조립체와 상기 폐쇄부 사이에 배치되며 상기 전극 조립체와 전기적으로 결합되는 집전체;상기 폐쇄부를 통해 상기 전극 조립체와 전기적으로 결합되는 단자; 및상기 단자와 상기 집전체 사이에 개재되며 상기 단자보다 상기 집전체와 더 큰 결합력으로 결합되는 CID;를 포함하는 배터리 셀.
- 제1항에 있어서,상기 CID와 상기 단자 간의 결합면의 면적보다 상기 CID와 상기 집전체 간의 결합면의 면적이 더 넓은 것을 특징으로 하는 배터리 셀.
- 제1항에 있어서,상기 단자의 하단에 형성되는 결합 면은 상기 전극 조립체의 권취 중심 홀과 대응되는 위치에 구비되는 것을 특징으로 하는 배터리 셀.
- 제3항에 있어서,상기 CID는,상기 권취 중심 홀과 대응되는 영역의 내측 및 외측에서 상기 집전체와 결합되는 것을 특징으로 하는 배터리 셀.
- 제1항에 있어서,상기 집전체는,상기 전극 조립체와 전기적으로 결합되는 제1 결합부; 및상기 전극 조립체의 반경 방향을 따라 상기 제1 결합부와 이격되어 위치하고 상기 전극 조립체의 권취 중심 홀과 대응되는 위치에 구비되는 제2 결합부;를 포함하는 것을 특징으로 하는 배터리 셀.
- 제5항에 있어서,상기 CID는,상기 제1 결합부 및 상기 제2 결합부와 모두 결합되는 것을 특징으로 하는 배터리 셀.
- 제6항에 있어서,상기 CID는,상기 전극 조립체의 반경 방향을 따라 상기 제1 결합부 및 상기 제2 결합부를 모두 커버하도록 구성되는 것을 특징으로 하는 배터리 셀.
- 제1항에 있어서,상기 배터리 셀은,상기 폐쇄부와 상기 집전체 사이에 개재되며, 상기 하우징 내부의 압력 증가에 따른 상기 폐쇄부와 상기 집전체 사이의 이격이 발생되었을 때, 이격 상태가 유지되도록 하는 CID 가스켓을 포함하는 것을 특징으로 하는 배터리 셀.
- 제8항에 있어서,상기 CID 가스켓은,상기 폐쇄부와 상기 집전체 사이에서 팽창하는 방향으로 탄성 복원력을 갖도록 구성되는 것을 특징으로 하는 배터리 셀.
- 제8항에 있어서,상기 CID 가스켓은,상기 하우징 내부의 온도 상승에 따라 팽창하도록 구성되는 것을 특징으로 하는 배터리 셀.
- 제8항에 있어서,상기 CID 가스켓은,적어도 일부가 상기 CID와 상기 폐쇄부 사이에 개재되는 것을 특징으로 하는 배터리 셀.
- 제1항에 있어서,상기 배터리 셀은, 상기 개방부를 커버하도록 구성되는 배터리 캡을 포함하고,상기 배터리 캡은, 주변과 비교하여 취약하게 구성되는 벤팅부를 구비하는 것을 특징으로 하는 배터리 셀.
- 제12항에 있어서,상기 단자와 상기 CID 간의 결합 부위는 상기 벤팅부의 벤팅 압력보다 더 낮은 압력에서 파단되도록 구성되는 것을 특징으로 하는 배터리 셀.
- 제1항 내지 제13항 중 어느 한 항에 따른 배터리 셀을 포함하는 배터리 팩.
- 제14항에 따른 배터리 팩을 포함하는 자동차.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202480004110.7A CN119948692A (zh) | 2023-06-15 | 2024-06-11 | 电池电芯、以及包括该电池电芯的电池组和车辆 |
| EP24823671.3A EP4576407A4 (en) | 2023-06-15 | 2024-06-11 | BATTERY CELL, AND BATTERY BLOCK AND VEHICLE INCLUDING IT |
| MX2025006862A MX2025006862A (es) | 2023-06-15 | 2025-06-12 | Celda de bateria, y paquete de baterias y vehiculo que lo incluye |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2023-0077099 | 2023-06-15 | ||
| KR1020230077099A KR20240176383A (ko) | 2023-06-15 | 2023-06-15 | 배터리 셀, 그리고 이를 포함하는 배터리 팩 및 자동차 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2024258153A1 true WO2024258153A1 (ko) | 2024-12-19 |
Family
ID=93852405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2024/007984 Ceased WO2024258153A1 (ko) | 2023-06-15 | 2024-06-11 | 배터리 셀, 그리고 이를 포함하는 배터리 팩 및 자동차 |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP4576407A4 (ko) |
| KR (1) | KR20240176383A (ko) |
| CN (1) | CN119948692A (ko) |
| MX (1) | MX2025006862A (ko) |
| WO (1) | WO2024258153A1 (ko) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018037327A (ja) * | 2016-09-01 | 2018-03-08 | トヨタ自動車株式会社 | 密閉型二次電池 |
| US20190074502A1 (en) * | 2017-09-07 | 2019-03-07 | Toyota Jidosha Kabushiki Kaisha | Sealed battery and manufacturing method of sealed battery |
| KR20190059677A (ko) * | 2017-11-23 | 2019-05-31 | 주식회사 엘지화학 | 파우치 형 이차 전지 |
| KR20190109072A (ko) * | 2018-03-16 | 2019-09-25 | 주식회사 엘지화학 | 이차전지 및 그 이차전지의 제조방법 |
| KR20230053484A (ko) * | 2021-10-14 | 2023-04-21 | 주식회사 엘지에너지솔루션 | 레이저 용접이 적용된 원통형 이차전지와 그 제조방법, 이러한 이차전지를 포함하는 배터리 팩 및 자동차 |
| KR20230077099A (ko) | 2021-11-25 | 2023-06-01 | 이병우 | 발광되는 콘센트 스윗치용 커버 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100578804B1 (ko) * | 2004-03-29 | 2006-05-11 | 삼성에스디아이 주식회사 | 캡 조립체 및 이를 구비한 이차 전지 |
| US11923566B2 (en) * | 2018-02-27 | 2024-03-05 | Panasonic Holdings Corporation | Sealed battery |
-
2023
- 2023-06-15 KR KR1020230077099A patent/KR20240176383A/ko active Pending
-
2024
- 2024-06-11 WO PCT/KR2024/007984 patent/WO2024258153A1/ko not_active Ceased
- 2024-06-11 EP EP24823671.3A patent/EP4576407A4/en active Pending
- 2024-06-11 CN CN202480004110.7A patent/CN119948692A/zh active Pending
-
2025
- 2025-06-12 MX MX2025006862A patent/MX2025006862A/es unknown
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018037327A (ja) * | 2016-09-01 | 2018-03-08 | トヨタ自動車株式会社 | 密閉型二次電池 |
| US20190074502A1 (en) * | 2017-09-07 | 2019-03-07 | Toyota Jidosha Kabushiki Kaisha | Sealed battery and manufacturing method of sealed battery |
| KR20190059677A (ko) * | 2017-11-23 | 2019-05-31 | 주식회사 엘지화학 | 파우치 형 이차 전지 |
| KR20190109072A (ko) * | 2018-03-16 | 2019-09-25 | 주식회사 엘지화학 | 이차전지 및 그 이차전지의 제조방법 |
| KR20230053484A (ko) * | 2021-10-14 | 2023-04-21 | 주식회사 엘지에너지솔루션 | 레이저 용접이 적용된 원통형 이차전지와 그 제조방법, 이러한 이차전지를 포함하는 배터리 팩 및 자동차 |
| KR20230077099A (ko) | 2021-11-25 | 2023-06-01 | 이병우 | 발광되는 콘센트 스윗치용 커버 |
Non-Patent Citations (1)
| Title |
|---|
| See also references of EP4576407A4 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN119948692A (zh) | 2025-05-06 |
| EP4576407A4 (en) | 2026-01-21 |
| KR20240176383A (ko) | 2024-12-24 |
| EP4576407A1 (en) | 2025-06-25 |
| MX2025006862A (es) | 2025-07-01 |
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