WO2023096390A1 - 전극 단자의 고정 구조 및 이를 포함하는 배터리, 배터리 팩 및 자동차 - Google Patents
전극 단자의 고정 구조 및 이를 포함하는 배터리, 배터리 팩 및 자동차 Download PDFInfo
- Publication number
- WO2023096390A1 WO2023096390A1 PCT/KR2022/018773 KR2022018773W WO2023096390A1 WO 2023096390 A1 WO2023096390 A1 WO 2023096390A1 KR 2022018773 W KR2022018773 W KR 2022018773W WO 2023096390 A1 WO2023096390 A1 WO 2023096390A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- battery housing
- electrode terminal
- electrode
- battery
- terminal
- Prior art date
Links
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L50/00—Electric propulsion with power supplied within the vehicle
- B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
- B60L50/60—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells using power supplied by batteries
- B60L50/64—Constructional details of batteries specially adapted for electric vehicles
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0431—Cells with wound or folded electrodes
-
- 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
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/167—Lids or covers characterised by the methods of assembling casings with lids by crimping
-
- 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
- H01M50/186—Sealing members characterised by the disposition of the sealing members
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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
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- 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
- H01M50/19—Sealing members characterised by the material
- H01M50/193—Organic material
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- 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
-
- 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
- H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
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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
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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
-
- 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
-
- 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
- H01M50/547—Terminals characterised by the disposition of the terminals on the cells
-
- 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
-
- 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
-
- 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
-
- 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 fixing structure of an electrode terminal and a battery, battery pack, and automobile including the same.
- Secondary batteries which are easy to apply according to product groups and have electrical characteristics such as high energy density, are used not only for portable devices but also for electric vehicles (EVs) driven by electric sources, hybrid electric vehicles (HEVs), It is universally applied to plug-in hybrid electric vehicles (PHEVs).
- EVs electric vehicles
- HEVs hybrid electric vehicles
- PHEVs plug-in hybrid electric vehicles
- an electric vehicle will be used as a concept including EV, HEV, PHEV, and the like.
- types of secondary batteries widely used include lithium ion batteries, lithium polymer batteries, nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and the like.
- the operating voltage of such a secondary battery is about 2.5V to 4.5V. Therefore, when a higher output voltage is required, a battery pack is formed by connecting a plurality of batteries in series.
- a battery pack is configured by connecting a plurality of batteries in parallel according to a charge/discharge capacity required for the battery pack. Accordingly, the number of batteries included in the battery pack and the type of electrical connection may be variously set according to a required output voltage and/or charge/discharge capacity.
- a separator which is an insulator, is interposed between a positive electrode and a negative electrode, and the electrode assembly in the form of a jelly roll is formed by winding the separator, and the electrode assembly is inserted together with the electrolyte into the battery housing to configure the battery.
- strip-shaped electrode tabs may be connected to the uncoated portions of the positive electrode and the negative electrode, and the electrode tab electrically connects the electrode assembly and the electrode terminal exposed to the outside.
- the positive terminal is a cap of a sealing body sealing the opening of the battery housing
- the negative terminal is the battery housing.
- FIG. 1 to 3 are views showing a manufacturing process of a tab-less cylindrical battery.
- FIG. 1 shows the structure of an electrode
- FIG. 2 shows a winding process of an electrode
- FIG. 3 shows a process of welding a current collector to a bent surface of a non-coated portion.
- 4 is a cross-sectional view of the tab-less cylindrical battery cut in the longitudinal direction (Y).
- the positive electrode 10 and the negative electrode 11 have a structure in which an active material 21 is coated on a sheet-shaped current collector 20, and is formed on one long side along a winding direction X. It includes an uncoated portion 22 .
- the electrode assembly (A) is manufactured by sequentially stacking the positive electrode 10 and the negative electrode 11 together with two sheets of separator 12 as shown in FIG. 2 and then winding them in one direction (X). At this time, the uncoated portions of the positive electrode 10 and the negative electrode 11 are disposed in opposite directions.
- the uncoated portion 10a of the positive electrode 10 and the uncoated portion 11a of the negative electrode 11 are bent toward the core. After that, the current collectors 30 and 31 are welded and coupled to the uncoated portions 10a and 11a, respectively.
- the current collectors 30 and 31 are connected to external electrode terminals, and the current path winds the electrode assembly A. Since it is formed with a large cross-sectional area along the axial direction (refer to the arrow in FIG. 3), it has the advantage of lowering the resistance of the battery. This is because resistance is inversely proportional to the cross-sectional area of the path through which current flows.
- the conventional tab-less cylindrical battery 40 includes a battery housing 41 and a sealing body 42 as shown in FIG. 4 .
- the sealing body 42 includes a cap 42a, a sealing gasket 42b and a connection plate 42c.
- the sealing gasket 42b surrounds the edge of the cap 42a and is fixed by the crimping part 43.
- the electrode assembly (A) is fixed in the battery housing 41 by the beading part 44 to prevent up and down movement.
- the positive terminal is the cap 42a of the enclosure 42 and the negative terminal is the battery housing 41 .
- the current collector 30 coupled to the non-coated portion 10a of the positive electrode 10 is electrically connected to the connection plate 42c attached to the cap 42a through the strip-shaped lead 45.
- the current collector 31 coupled to the uncoated portion 11a of the negative electrode 11 is electrically connected to the bottom of the battery housing 41 .
- the insulator 46 covers the current collector 30 to prevent a short circuit from being caused by contact between the battery housing 41 having a different polarity and the uncoated portion 10a of the positive electrode 10 .
- a lead 45 in the form of a strip is used.
- the lead 45 is separately attached to the current collector 30 or manufactured integrally with the current collector 30 .
- the lead 45 is in the form of a thin strip, its cross-sectional area is small, so that a lot of heat is generated when a rapid charging current flows.
- excessive heat generated in the lead 45 is transferred to the side of the electrode assembly A and causes the separator 12 to shrink, causing an internal short circuit, which is a major cause of thermal runaway.
- the portion of the current collector 31 facing the bottom of the battery housing 41 is in direct contact with the bottom of the battery housing 41, so that a sufficiently large cross-sectional area is already secured in the direction of current movement. No problems with overheating etc.
- the current collector 30 connected to the sealing body 42 crimped in the opening of the battery housing 41 is connected to the sealing body 42 through the strip-shaped lead 45, the overheating problem described above is solved. must be the cause
- the lead 45 occupies a considerable installation space within the battery housing 41. Therefore, the cylindrical battery 40 including the lead 45 has a limitation in increasing energy density due to low space efficiency.
- the crimping portion 43 provided at the edge of the sealing body 42 is exposed to the upper portion of the cylindrical battery 40 as a negative polarity portion.
- the top of the crimping portion 43 is shown to be large, but in reality, the area of the crimping portion 43 exposed to the top is very small compared to the area of the sealing body 42 . Therefore, in order to stably connect the bus bar parts, the bottom of the battery housing 41 and the sealing body 42 crimped to the opening of the battery housing 41 are inevitably used.
- the present invention has been made to solve the above problems, and it is to improve the electrode terminal structure of the cylindrical battery to increase space efficiency in the battery housing, thereby lowering the internal resistance of the cylindrical battery and increasing the energy density.
- Another technical problem of the present invention is to improve the internal heat generation problem occurring during rapid charging by improving the electrode terminal structure of the cylindrical battery to enlarge the cross-sectional area of the current path.
- Another technical problem of the present invention is to provide a cylindrical battery having an improved structure in which an electrical wiring work for series and/or parallel connection of the cylindrical batteries can be performed on one side of the cylindrical battery.
- Another technical problem of the present invention is to provide a battery pack manufactured using a cylindrical battery having an improved structure and a vehicle including the battery pack.
- An electrode terminal fixing structure for achieving the above technical problem includes a battery housing having an open end on one side and a bottom portion with a through hole formed on the other side; an electrode terminal fixed to the bottom portion; and a terminal gasket interposed between the electrode terminal and the bottom portion.
- the electrode terminal may include: a neck portion having a cross section smaller than that of the through hole and inserted into the through hole; a head portion connected to one end of the neck portion, having a cross section larger than that of the through hole, and extending along one surface of the bottom portion; a protrusion connected to the other end of the neck portion and extending along the axial direction of the battery housing from the other surface of the bottom portion; a diameter expansion portion extending in a centrifugal direction from the protruding portion; and a front end surface provided at an axial end of the protrusion, and the enlarged diameter portion may be a fastening member physically coupled to an outer circumferential surface of the protrusion.
- An outer circumferential surface of the protrusion may be provided with a fastening groove formed along a circumferential direction and recessed in a centripetal direction, and the fastening member may be inserted into and fixed to the fastening groove.
- the fastening groove may have a male screw thread shape, and the fastening member may be a nut having a female thread fastened to the male screw thread.
- the fastening groove may be an O-shaped groove, and the fastening member may be a C-shaped ring inserted into the O-shaped groove.
- a surface of the fastening member facing the bottom portion may include a side wall surface that gradually moves away from the bottom portion toward an outer side in a radial direction.
- the side wall surface may press the terminal gasket toward the bottom of the battery housing.
- the fixing structure of the electrode terminal may further include a first sealing coating layer formed on an interface between the terminal gasket and the bottom portion of the battery housing.
- the first sealing coating layer may include silicone resin, silicone acrylate, or polyamideimide.
- the fixing structure of the electrode terminal may further include a second sealing coating layer covering an externally exposed interface between the fastening member and the terminal gasket.
- the second sealing coating layer may cover an externally exposed interface between the terminal gasket and the bottom portion.
- the second sealing coating layer may include silicone resin, silicone acrylate, or polyamideimide.
- the front end surface may protrude more in the axial direction of the battery housing than the diameter expansion part based on the bottom surface of the battery housing.
- the front end surface may include a flat portion having a flat surface.
- the fastening member may have a first section that gradually moves away from the bottom of the battery housing as it extends in a centrifugal direction from the protrusion.
- an angle formed between a surface of the fastening member and the bottom portion facing the bottom portion may be greater than 0 degrees and less than 60 degrees.
- a diameter of a cross section of the enlarged part cut in a direction perpendicular to a central axis of the battery housing may be greater than a diameter of the through hole.
- the diameter of the enlarged portion may gradually increase as the diameter of a section cut in a direction perpendicular to the central axis of the battery housing is further away from the bottom portion of the battery housing.
- a portion of the terminal gasket interposed between the head portion and the bottom portion of the battery housing may have a compressed state.
- a battery according to another aspect of the present invention for achieving the above technical problem may include a fixing structure of an electrode terminal including at least one or more of the above-described features.
- the first electrode and the second electrode are wound with a separator interposed therebetween, and the electrode includes a non-coated portion of the first electrode and a non-coated portion of the second electrode extending from both ends and exposed to the outside of the separator. assembly; and a battery housing having an open end on one side, accommodating the electrode assembly through the open end, and electrically connected to the first electrode.
- An electrode terminal installed through the through hole so as not to contact the inner wall of the through hole formed at the bottom of the battery housing and electrically connected to the second electrode, having a cross section smaller than that of the through hole, and inserted neck portion; a head portion connected to one end of the neck portion, having a cross section larger than that of the through hole, and extending along one surface of the bottom portion; a protrusion connected to the other end of the neck portion and extending along the axial direction of the battery housing from the other surface of the bottom portion; a diameter expansion portion extending in a centrifugal direction from the protruding portion; and a front end surface provided at an axial end of the protruding portion, wherein the enlarged diameter portion is a fastening member physically coupled to an outer circumferential surface of the protruding portion, an electrode terminal; a terminal gasket interposed between the electrode terminal and the through hole; and a sealing body sealing an open end of the battery housing to be insulated from the battery housing.
- the battery housing includes a beading portion press-fitted into the battery housing in a region adjacent to the open end, and the sealing body includes a non-polar cap and a seal interposed between an edge of the cap and the open end of the battery housing. Gaskets may be included.
- the battery housing may further include a crimping portion that extends and is bent toward the inside of the battery housing and surrounds and fixes an edge of the cap together with the sealing gasket.
- the battery further includes a first current collector coupled to the uncoated portion of the first electrode, wherein at least a portion of an edge of the first current collector that does not contact the uncoated portion of the first electrode is connected to the beading portion and the uncoated portion of the first electrode. It may be interposed between sealing gaskets and fixed by the crimping part.
- At least a portion of an edge of the first current collector may be fixed to an inner circumferential surface of the beading portion adjacent to the crimping portion through welding.
- the battery may further include a second current collector coupled to the uncoated portion of the second electrode, and at least a portion of the second current collector may be welded to a front end surface of the electrode terminal.
- the battery may further include an insulator interposed between the second current collector and the inner circumferential surface of the bottom of the battery housing, and between the inner circumferential surface of the sidewall of the battery housing and the electrode assembly.
- the battery may be cylindrical, and a ratio of a form factor divided by a diameter of the battery by a height may be greater than 0.4.
- An AC resistance of the battery measured through an electrode terminal of the battery and an outer surface of a bottom portion of the battery housing may be 4 milliohm or less.
- the technical problem of the present invention can also be achieved by a battery pack including a plurality of the above-described batteries and a vehicle including the battery pack.
- the internal resistance of the cylindrical battery can be reduced and the energy density of the cylindrical battery can be increased by improving space efficiency in the battery housing by improving the electrode terminal structure of the cylindrical battery so that the lead can be omitted.
- the problem of internal heat generation during rapid charging can be improved by improving the structure of the electrode terminals of the cylindrical battery so that the electrode terminals and the current collector can be directly connected to each other to enlarge the cross-sectional area of the current path.
- a battery pack manufactured using a cylindrical battery having an improved structure and a vehicle including the battery pack may be provided.
- 1 is a plan view showing the structure of an electrode used in a conventional tap-less cylindrical battery.
- FIG. 2 is a view showing a winding process of an electrode assembly included in a conventional tab-less cylindrical battery.
- FIG. 3 is a view showing a process of welding a current collector to a bent surface of an uncoated portion in the electrode assembly of FIG. 2 .
- FIG. 4 is a cross-sectional view of a conventional tab-less cylindrical battery cut in the longitudinal direction (Y).
- FIG. 5 is a cross-sectional view showing a fixing structure of an electrode terminal according to a first embodiment of the present invention.
- FIG. 6 is an enlarged view showing only the electrode terminal portion in FIG. 5 .
- FIG. 7 is an enlarged cross-sectional view of a portion indicated by a dotted circle in FIG. 5 .
- FIG. 8 is a cross-sectional view of a cylindrical battery according to an embodiment of the present invention cut along a Y-Z plane.
- FIG 9 is an enlarged view showing a modified example of the electrode terminal of the first embodiment.
- FIGS. 10 and 11 are diagrams showing enlarged electrode terminals of the second embodiment.
- FIGS. 12 and 13 are cross-sectional views showing a case where a sealing coating layer is applied to the fixing structure of the electrode terminal including the electrode terminal of the second embodiment.
- FIG 14 is an enlarged view showing a modified example of the electrode terminal of the second embodiment.
- 15 and 16 are cross-sectional views showing a case in which a sealing coating layer is applied to a fixing structure of an electrode terminal including an electrode terminal according to a modification of the second embodiment.
- 17 is a plan view exemplarily showing an electrode structure according to a preferred embodiment of the present invention.
- FIG. 18 is a cross-sectional view of an electrode assembly obtained by applying a segmental structure of an electrode according to an embodiment of the present invention to a first electrode and a second electrode, cut along a longitudinal direction (Y).
- 19 is a cross-sectional view of the electrode assembly in which the uncoated portion is bent along the longitudinal direction (Y) according to an embodiment of the present invention.
- 20 is a diagram showing a schematic configuration of a battery pack including cylindrical batteries according to an embodiment of the present invention.
- 21 is a diagram showing a schematic configuration of a vehicle including a battery pack according to an embodiment of the present invention.
- first, second, etc. are used to describe various components, these components are not limited by these terms, of course. These terms are only used to distinguish one component from another component, and unless otherwise stated, the first component may be the second component, of course.
- the arrangement of an arbitrary element on the "upper (or lower)" or “upper (or lower)” of a component means that an arbitrary element is placed in contact with the upper (or lower) surface of the component.
- ком ⁇ онент when a component is described as “connected”, “coupled” or “connected” to another component, the components may be directly connected or connected to each other, but other components may be “interposed” between each component. ", or each component may be “connected”, “coupled” or “connected” through other components.
- a direction along the longitudinal direction of the winding shaft of the electrode assembly wound in the form of a jelly roll is referred to as an axial direction (Y).
- a direction surrounding the winding shaft is referred to as a circumferential direction or a circumferential direction (X).
- a direction closer to or away from the winding axis is referred to as a radial direction or a radial direction (Z).
- a direction closer to the winding axis is referred to as a centripetal direction
- a direction away from the winding axis is referred to as a centrifugal direction.
- the fixing structure of the electrode terminal 50 according to the present invention may be applied to a cylindrical battery housing (H) structure.
- the cylindrical battery housing H may include a cylindrical sidewall 51 and a bottom portion 52 connected to an end of the sidewall 51 . Accordingly, the cylindrical battery housing H may have a structure in which one side is open and the other side is blocked by the bottom portion 52 .
- the electrode assembly 71 may be inserted into the battery housing H through an open side of the battery housing H, and the front end of the electrode assembly 71 (the end of the electrode assembly inserted first) is It can be inserted until reaching the bottom part 52 of the battery housing (H).
- a through hole 53 is formed in the bottom portion 52 of the battery housing H.
- the bottom portion 52 includes a first surface 52a and a second surface 52b that face each other, and the through hole 53 is formed between a first space where the first surface 52a faces and the second surface 52b. It is a hole formed to pass through the bottom portion 52 so that the second space facing the two surfaces 52b communicates therethrough.
- the first surface 52a may be a surface exposed to the outside of the battery housing H, and thus the first space may be an external space of the battery housing H.
- the second surface 52b may be a surface facing the inside of the battery housing H, and thus the second space may be an inner space of the battery housing H.
- the second surface 52b may be a surface exposed to the outside of the battery housing H, and the first surface 52a may be a rear surface facing the inside of the battery housing H.
- the second space may be an external space of the battery housing (H)
- the first space may be an internal space of the battery housing (H).
- the first surface 52a and the second surface 52b correspond to the outer and inner surfaces of the bottom part 52 of the battery housing H, respectively.
- the through hole 53 may be provided near the center of the bottom portion 52 of the battery housing H.
- the electrode terminal 50 may be fixed by a plastic working part 50c 1 formed by plastic working.
- plastic working may include riveting, caulking, and the like.
- the electrode terminal 50 may be fixed through a separate fastening member ( 50c 2 in FIG. 10 or 50c 3 in FIG. 14 ).
- These fastening members 50c 2 and 50c 3 may include nuts, snap rings, and the like.
- the electrode terminal 50 is provided at a neck portion 50a having a cross section smaller than that of the through hole 53 and at one end of the neck portion 50a, and the through hole 53 has a cross section.
- a head portion 50b having a larger cross section than the cross section of the hole 53 may be included.
- a protrusion 50e having a cross section smaller than that of the through hole 53 is provided at the other end of the neck portion 50a.
- the plastic processing part 50c 1 is formed by plastic processing of the edge of the protruding part 50e from the second surface 52b side of the bottom part 52, or the fastening member 50c 2 or the fastening member 50c 2 or FIG. 50c 3 ) can be physically fixed.
- the plastic processing part 50c 1 or the fastening members 50c 2 and 50c 3 form a diameter expansion part E that expands the cross-sectional area of the protruding part 50e. Accordingly, the cross section of the protruding portion 50e becomes larger than the cross section of the through hole 53, and the electrode terminal 50 is inserted into the through hole 53 to maintain a fixed state.
- the electrode terminal 50 is inserted through the through hole 53 provided in the bottom portion 52 from the outside of the battery housing H, and the protrusion 50e inside the battery housing H is fired.
- the fastening members 50c 2 and 50c 3 may be processed or fixed to the protrusion 50e.
- the head portion 50b of the electrode terminal 50 may be exposed to the outside of the battery housing H, and the protruding portion 50e of the electrode terminal 50 may be disposed inside the battery housing H.
- the electrode terminal 50 is inserted through the through hole 53 provided in the bottom portion 52 from the inside of the battery housing (H), and from the outside of the battery housing (H), the protrusion ( 50e) may be plastically processed, or fastening members 50c 2 and 50c 3 may be fixed to the protrusion 50e. Then, the head portion 50b of the electrode terminal 50 may be disposed inside the battery housing H, and the protruding portion 50e of the electrode terminal 50 may be exposed to the outside of the battery housing H.
- a surface (a surface exposed in an axial direction) of the head portion 50b of the electrode terminal 50 may have a flat area.
- the flat area may provide a connection surface for a bus bar or the like.
- the cross section of the protruding portion 50e of the electrode terminal 50 may be expanded by riveting.
- the protruding portion 50e of the electrode terminal 50 may include a plastically processed portion 50c 1 formed by plastic deformation by riveting, and a front end surface 50d provided at a front end of the protruding portion 50e.
- the plastic processing unit 50c 1 may constitute a diameter expansion unit E.
- the front end surface 50d may be disposed on a more centripetal side (radially inner side) than the plastic working part 50c 1 .
- the front end surface 50d may include a flat portion D having a flat surface.
- the front end surface 50d may form an overall flat flat portion D.
- the front end surface 50d may be a surface already formed before riveting is performed. That is, the front end surface 50d may be a region that is not deformed by the riveting.
- the front end surface 50d may have a surface that protrudes further in the axial direction than the enlarged diameter portion E.
- the plastic processing part 50c 1 may include a first section 501c gradually away from the bottom part 52 of the battery housing H as it extends in a centrifugal direction from the protruding part 50e.
- an angle formed between a surface of the plastic working part 50c 1 and the bottom part 52 facing the bottom part 52 may be greater than 0 degrees and less than 60 degrees.
- the plastic processing unit 50c 1 may include only the first section 501c.
- the plastic processing unit 50c 1 is disposed at a more centrifugal side than the first section 501c and is connected to the first section 501c in a second section 502c. ) may be further provided. As the second section 502c extends in the centrifugal direction, it may gradually approach the bottom portion 52 of the battery housing H.
- an angle ⁇ formed between a surface of the plastic working part 50c 1 and the bottom part 52 facing the bottom part 52 may be greater than 0 degrees and less than 30 degrees.
- a groove part 55 recessed in the axial direction may be provided between the plastic processing part 50c 1 and the front end surface 50d.
- the groove portion 55 may have a closed loop shape surrounding the front end surface 50d in a circumferential direction.
- the groove portion 55 may have a cross-sectional structure of an asymmetrical groove. That is, the side wall surface 55a of the flat part D and the side wall surface 55b of the plastic working part 50c 1 may not be parallel to each other.
- the groove portion 55 prevents the external force applied for plastic deformation from affecting the flat portion D when the upper portion of the protrusion portion 50e is plastically deformed into the enlarged diameter portion E through riveting. Accordingly, the size and shape of the flat portion D may be maintained even after riveting.
- a sidewall surface 55a connecting the bottom of the groove portion 55 and the flat portion D may be perpendicular to a plane including the flat portion D. Accordingly, the area of the flat region of the flat portion D can be secured as much as possible.
- the side wall surface 55b of the plastic working part 50c 1 facing the side wall surface 55a of the flat part D may form an inclined surface.
- the thickness of the enlarged diameter portion E may decrease as the distance from the protrusion portion 50e increases.
- the cross section of the protruding portion 50e of the electrode terminal 50 may be expanded by physical coupling of the fastening members 50c 2 and 50c 3 .
- a fastening groove 50g extending in a circumferential direction may be provided on an outer circumferential surface of the protruding portion 50e of the electrode terminal 50 .
- the fastening groove 50g may have a groove shape in which the cross section of the protrusion 50e is reduced. That is, the fastening groove 50g may be recessed in a centripetal direction from the outer circumferential surface of the protrusion 50e.
- the fastening groove 50g is an O-shaped groove
- the fastening member 50c 2 may be a C-shaped ring fitted into the O-shaped groove.
- the fastening groove 50g has a male thread shape, and the fastening member 50c 3 may be a nut having a female thread.
- a surface of the fastening members 50c 2 and 50c 3 facing the bottom portion 52 of the battery housing H may have a shape gradually away from the bottom portion 52 toward the outside in the radial direction.
- the front end surface 50d of the protrusion 50e has a flat flat portion D, and the flat portion D is fastened to the fastening members 50c 2 and 50c 3 .
- the size and shape can be maintained without being affected by
- a terminal gasket 54 may be interposed between the electrode terminal 50 and the bottom portion 52 of the battery housing H.
- the terminal gasket 54 is formed between the head part 50b of the electrode terminal 50 and the bottom part 52, and between the neck part 50a of the electrode terminal 50 and the inner circumferential surface of the through hole 53. , It may be interposed between the enlarged diameter portion E of the protruding portion 50e of the electrode terminal 50 and the bottom portion 52. Accordingly, the terminal gasket 54 may insulate the electrode terminal 50 from the bottom portion 52 and provide air tightness of the battery housing H.
- the plastic processing part 50c 1 or the fastening member 50c 2 , 50c 3 , the side wall surface (surface facing the bottom part 52 ) is the inner circumferential surface of the through hole 53 and the second surface of the bottom part 52
- the terminal gasket 54 is strongly pressed at the corner where the surface 52b is connected.
- the fixing structure of the electrode terminal 50 is a first sealing coating layer formed between the terminal gasket 54 and the bottom portion 52 of the battery housing H ( f 1 ) may be included.
- the first sealing coating layer f 1 may be interposed between the terminal gasket 54 and the bottom portion 52 of the battery housing H to improve sealing performance of the terminal gasket 54 .
- the fixing structure of the electrode terminal 50 is an externally exposed interface and/or fastening between the terminal gasket 54 and the bottom portion 52 of the battery housing H.
- a second sealing coating layer f 2 covering externally exposed interfaces between the members 50c 2 and 50c 3 and the terminal gasket 54 may be included.
- the second sealing coating layer f 2 can improve the sealing performance of the terminal gasket 54 like the first sealing coating layer f 1 .
- first sealing coating layer (f 1 ) and/or the second sealing coating layer (f 2 ) are optional elements, not essential elements.
- the first sealing coating layer (f 1 ) and/or the second sealing coating layer (f 2 ) may be made of a material that has excellent sealing properties and is resistant to electrolytes.
- a silicone resin, silicone acrylate, or polyamideimide may be used as a material for the sealing coating layers (f 1 , f 2 ), but the present invention is not limited thereto.
- the cylindrical battery according to the first embodiment of the present invention may include electrode terminals riveted to the bottom of the battery housing.
- FIG. 5 is a cross-sectional view showing a riveting structure of an electrode terminal 50 according to an embodiment of the present invention
- FIG. 6 is an enlarged cross-sectional view of only the electrode terminal 50
- FIG. 7 is an enlarged view of a portion indicated by a dotted line circle. it is a cross section
- the riveting structure of the electrode terminal 50 includes a cylindrical battery housing H with one side open, and a bottom portion 52 of the battery housing H. It may include an electrode terminal 50 riveted through the through hole 53 formed in ) and a terminal gasket 54 interposed between the electrode terminal 50 and the through hole 53.
- the battery housing H is made of a conductive metal material.
- the battery housing H may be made of steel or aluminum, but the present invention is not limited thereto.
- the battery housing H includes a cylindrical sidewall 51 and a bottom portion 52 connected to an end of the sidewall.
- the bottom part 52 may be integrally formed with the side wall 51 .
- the battery housing (H) may be molded integrally with the side wall 51 and the bottom portion 52 by drawing sheet metal with a press.
- the through hole 53 formed in the bottom portion 52 may be manufactured by forming the sidewall 51 and the bottom portion 52 and then drilling the bottom portion 52 .
- the electrode terminal 50 is made of a conductive metal material.
- the electrode terminal 50 may be made of aluminum or steel, but the present invention is not limited thereto.
- the terminal gasket 54 may be made of a polymer resin having insulation and elasticity.
- the terminal gasket 54 may be made of polypropylene, polybutylene terephthalate, polyfluorinated ethylene, or the like, but the present invention is not limited thereto.
- the electrode terminal 50 includes a neck portion 50a inserted into the through hole 53, a head portion 50b exposed through the outer surface 52a of the bottom portion 52, and a battery housing H It is exposed through the inner surface 52b of the bottom portion 52 and includes a protrusion 50e extending in the axial direction.
- the head portion 50b may extend more radially outward than the neck portion 50a.
- a diameter of the head portion 50b may be greater than a diameter of the through hole 53 .
- the protrusion 50e may include an enlarged diameter portion E extending radially outward from its circumference, and a flat portion D provided radially inside the enlarged diameter portion E.
- the enlarged diameter portion E may be formed through a molding process that causes plastic deformation by spreading an upper edge portion of the protrusion portion 50e having a smaller size than the through hole 53 outward in a radial direction. That is, the diameter expansion part E may be a plastic processing part 50c 1 .
- the plastic processing unit 50c 1 may be formed by a riveting process using a caulking jig. After riveting, the diameter of the enlarged portion E is larger than that of the through hole 53 .
- the front end surface 50d of the protrusion 50e is a surface provided at an end of the protrusion 50e, and may provide a flat flat portion D facing the axial direction.
- the flat portion D and the inner surface 52b of the bottom portion 52 of the battery housing H may be parallel to each other.
- 'parallel' means substantially parallel when observed with the naked eye.
- the enlarged diameter part E may include a first section 501c gradually moving away from the inner surface 52b toward the distal end, as shown in FIG. 6 .
- the angle ⁇ between the surface of the first section 501c of the enlarged part E facing the bottom part 52 and the inner surface 52b of the bottom part 52 may be 0 degrees or more and 60 degrees or less. there is.
- the size of the angle ⁇ is determined by riveting strength when the electrode terminal 50 is installed in the through hole 53 of the battery housing H by the riveting method. In one example, as the riveting strength increases, the angle ⁇ may decrease to 0 degrees. If the angle exceeds 60 degrees, the sealing effect of the terminal gasket 54 may deteriorate.
- the enlarged diameter portion E includes a first section 501c gradually moving away from the inner surface 52b toward the distal end, as shown in FIG. 9, and the distal end of the first section 501c. It may have a shape including a second section 502c connected to the side end and gradually approaching the inner surface 52b toward the distal end.
- the angle ⁇ between the surface of the second section 502c of the enlarged part E facing the bottom part 52 and the inner surface 52b of the bottom part 52 may be greater than 0 degrees and less than 30 degrees. there is.
- the second section 502c may be formed again after molding the first section 501c.
- the second section 502c presses the terminal gasket 54 so that the terminal gasket 54 can lie down along the bottom part 52 without standing too high from the inner surface 52b of the bottom part 52. . If the angle exceeds 30 degrees, the boundary between the first section 501c and the second section 502c may be excessively plastically deformed.
- the second section 502c provides a structure in which the enlarged diameter portion E does not protrude further than the flat portion D in the axial direction. Then, the utilization of the inner space of the battery housing (H) may be increased by reducing the height of the flat portion (D) protruding in the axial direction as much as possible.
- the front end surface 50d may protrude more in the axial direction than the enlarged diameter portion E.
- a groove portion 55 may be provided between the enlarged diameter portion E and the flat portion D.
- the groove portion 55 may have a cross-sectional structure of an asymmetric groove.
- the asymmetrical groove may be approximately "V" to "U” shaped.
- the asymmetrical groove may include a side wall surface 55a on the side of the flat portion D and a side wall surface 55b on the side of the enlarged diameter portion E facing the side wall surface 55a.
- the side wall surface 55a may be substantially perpendicular to the inner surface 52b of the bottom portion 52 of the battery housing H. 'Vertical' means substantially vertical when observed with the naked eye.
- the groove portion 55 may be made in the shape of a caulking jig when the electrode terminal 50 is installed in the through hole 53 of the battery housing H.
- the thickness of the enlarged diameter portion E may gradually decrease toward the outer side in the radial direction.
- This thickness reduction structure provides a compact structure that sufficiently compresses the terminal gasket 54 in the centripetal direction of the enlarged diameter portion E and prevents the distal end of the enlarged diameter portion E from protruding from the flat portion D. Then, the height of the flat portion D protruding in the axial direction can be made as low as possible, thereby increasing the utilization of the space inside the battery housing.
- the terminal gasket 54 includes an outer gasket 54a interposed between the outer surface 52a of the head portion 50b and the bottom portion 52, the enlarged diameter portion E and the bottom portion 52. ) It may include an inner gasket (54b) interposed between the inner surface (52b).
- the outer gasket 54a and the inner gasket 54b may have different thicknesses depending on positions.
- the area of the inner gasket 54b is interposed between the inner edge 56 of the through hole 53 connected to the inner surface 52b of the bottom portion 52 of the battery housing H and the enlarged diameter portion E.
- the thickness of the region may be relatively small.
- a minimum thickness point may exist in a gasket region interposed between the inner edge 56 of the through hole 53 and the enlarged diameter portion E.
- the inner edge 56 of the through hole 53 may include a facing surface 57 facing the enlarged diameter portion E. The opposing surface 57 functions as a chamfer to prevent the pressure of the enlarged diameter portion E pressing the terminal gasket 54 from being excessively concentrated on the inner edge 56 portion.
- top and/or bottom of the inner wall of the through hole 53 may be made of a smooth curved surface having a curvature. In this case, the stress applied to the terminal gasket 54 near the top and/or bottom of the inner wall of the through hole 53 can be more alleviated.
- the inner gasket 54b may form an angle of 0 to 60 degrees with the inner surface 52b of the bottom portion 52 of the battery housing H, and may extend longer than the enlarged diameter portion E. Accordingly, it is possible to prevent a phenomenon in which the distal side end of the enlarged diameter portion E comes into contact with the bottom portion 52 of the battery housing H.
- the height H1 of the flat portion D relative to the inner surface 52b of the bottom portion 52 of the battery housing H is equal to or greater than the height H2 of the end portion of the inner gasket 54b.
- the height H1 of the flat portion D based on the inner surface 52b of the bottom portion 52 of the battery housing H may be equal to or greater than the height H3 of the end portion H3 of the enlarged diameter portion E.
- a radius R1 from the center of the electrode terminal 50 to the edge of the head portion 50b may be 10% to 60% of the radius R2 of the bottom portion 52 .
- ratio R1/R2 is adjusted between 10% and 60%, it is possible to appropriately secure the welding space for the outer surfaces of the electrode terminal 50 and the bottom portion 52.
- the radius R3 from the center of the electrode terminal 50 to the edge of the flat portion D may be 4% to 30% based on the radius R2 of the bottom portion 52 .
- R3 has to be smaller than the radius of the through hole 53.
- R3 increases, the thickness of the diameter expansion part E decreases.
- the sealing ability of the terminal gasket 54 may be reduced because the enlarged diameter portion E compresses the terminal gasket 54 .
- the riveting structure of the electrode terminal 50 can be formed using a caulking jig that moves up and down.
- a pre-form (not shown) of the electrode terminal 50 is inserted into the through hole 53 formed in the bottom part 52 of the battery housing H with the terminal gasket 54 interposed therebetween.
- a preform refers to an electrode terminal before being riveted.
- the caulking jig is inserted into the inner space of the battery housing (H).
- the caulking jig has grooves and protrusions corresponding to the final shape of the electrode terminal 50 on a surface facing the preform to form the electrode terminal 50 by riveting the preform.
- the caulking jig is moved downward to press and form the upper part of the preform to plastically deform the preform into the riveted electrode terminal 50 .
- the pressing depth of the caulking jig may be regulated by the front end face 50d. Accordingly, it is possible to uniformly control the shape of the diameter-enlarging portion E that is plastically deformed even in the mass production process.
- the front end surface 50d is not deformed or hardly deformed during the press-fitting process of the caulking jig. Therefore, the front end surface 50d can also maintain a uniform shape during mass production. This further facilitates welding processing between the front end surface 50d and the current collector (79 in FIG. 8), and accordingly, manufacturing deviation can be remarkably reduced.
- the outer gasket 54a interposed between the outer surface 52a of the head portion 50b and the bottom portion 52 is elastically compressed and its thickness is reduced.
- the inner gasket 54b portion interposed between the inner edge 56 of the through hole 53 and the preform is elastically compressed by the enlarged diameter portion E, and the thickness is further reduced than other areas.
- the region where the thickness of the inner gasket 54b is intensively reduced is a portion indicated by a dotted line circle in FIG. 7 . Accordingly, the sealing and airtightness between the riveted electrode terminal 50 and the battery housing H is remarkably improved.
- the terminal gasket 54 is compressed sufficiently to secure a desired sealing strength without being physically damaged during the process of riveting the preform.
- the terminal gasket 54 when the terminal gasket 54 is made of polybutylene terephthalate, the terminal gasket 54 preferably has a compression rate of 50% or more at the point where it is compressed to a minimum thickness.
- the compressibility is the ratio of the change in thickness before and after compression to the thickness before compression.
- the compression ratio of the terminal gasket 54 is 60% or more at the point where it is compressed to the minimum thickness.
- the terminal gasket 54 when the terminal gasket 54 is made of polypropylene, the terminal gasket 54 preferably has a compression rate of 60% or more at the point where it is compressed to a minimum thickness.
- the pressure forming of the upper part of the preform may be performed step by step by moving the caulking jig up and down at least twice. That is, the preform may be plastically deformed several times by pressing and forming in stages. At this time, the pressure applied to the caulking jig may be increased step by step. In this way, it is possible to prevent damage to the terminal gasket 54 during the caulking process by distributing the stress applied to the preform several times. In particular, damage to the gasket is minimized when the portion of the inner gasket 54b interposed between the inner edge 56 of the through hole 53 and the preform is intensively compressed by the enlarged diameter portion E.
- the fixed structure of the electrode terminal 50 according to the embodiment of the present invention can be obtained as shown in FIG. 7 .
- the caulking jig presses and forms the upper part of the preform through up and down movement inside the battery housing H.
- a rotary rotary jig used in the prior art may be used for pressure forming of the preform.
- the rotary rotation jig performs a rotational motion in a state of being inclined at a predetermined angle with respect to the central axis of the battery housing (H). Therefore, the rotary rotating jig having a large rotation radius may cause interference with the inner wall of the battery housing (H).
- the length of the rotary rotating jig is also increased by that much. In this case, as the radius of rotation of the end of the rotary rotating jig increases, press forming of the preform may not be performed properly. Therefore, pressure forming using a caulking jig is more effective than a method using a rotary rotary jig.
- the diameter-enlarging portion E may be formed through the plastic working described above, or may be formed using physical fastening members 50c 2 and 50c 3 .
- the cross section of the protruding portion 50e of the electrode terminal 50 may be expanded in the axial direction by the coupling of the fastening member 50c 2 .
- the fastening member (50c 2 ) may be a C-type snap ring.
- a coupling groove 50g extending in a circumferential direction may be provided on an outer circumferential surface of the protruding portion 50e of the electrode terminal 50 .
- the fastening groove 50g may have an annular groove shape in which the cross section of the protrusion 50e is reduced.
- the fastening member 50c 2 may be press-fitted from the front end surface 50d of the protrusion 50e and inserted into the fastening groove 50g.
- the C-type snap ring is elastically deformed so that the radius is expanded, and when inserted into the coupling groove (50g), the radius is elastically restored so that the radius is reduced again, and can be firmly fastened to the coupling groove (50g).
- the fastening member 50c 2 When the fastening member 50c 2 is inserted into and fixed to the fastening groove 50g, the fastening member 50c 2 is integrated with the protrusion 50e. Accordingly, the protruding portion 50e may have a structure in which a cross section is further enlarged in the radial direction along the axial direction. That is, after the fastening member 50c 2 is fastened to the protruding portion 50e, it may form the diameter expansion portion E of the protruding portion 50e.
- a surface of the fastening member 50c 2 facing the bottom portion 52 has a shape that is farther away from the bottom portion 52 toward an outer side in the radial direction. Accordingly, the fastening member 50c 2 has a structure inclined by a predetermined angle ⁇ with respect to the bottom part 52 like the first section 501c of the plastic working part 50c 1 .
- a first sealing coating layer (f 1 ) is provided between the terminal gasket 54 and the bottom portion 52 of the battery housing (H). may be provided.
- the first sealing coating layer f 1 may be formed in advance on the bottom portion 52 and the through hole 53 of the battery housing H before installing the electrode terminal 50 in the through hole 53 .
- the second sealing coating layer (f 2 ) is applied to the externally exposed interface and/or fastening between the terminal gasket 54 and the bottom portion 52 of the battery housing (H).
- An externally exposed interface between the member 50c 2 and the terminal gasket 54 may be covered.
- the second sealing coating layer f 2 may be formed using a spray coating method after the installation of the electrode terminal 50 is completed.
- first sealing coating layer (f 1 ) and/or the second sealing coating layer (f 2 ) are optional elements, not essential elements.
- the first sealing coating layer (f 1 ) and/or the second sealing coating layer (f 2 ) may be made of a material that has excellent sealing properties and is resistant to electrolytes.
- a silicone resin, silicone acrylate, or polyamideimide may be used as a material for the sealing coating layers (f 1 , f 2 ), but the present invention is not limited thereto.
- the electrode terminal 50 may include an enlarged diameter portion E formed by a bolt/nut coupling structure.
- a male threaded fastening groove 50g may be formed on an upper outer circumferential surface of the protruding portion 50e of the electrode terminal 50 .
- the fastening member (50c 3 ) may be a nut having a female thread formed on the inner circumferential surface.
- a surface facing the bottom portion 52 of the battery housing H of the fastening member 50c 3 having the nut structure may include a shape gradually away from the bottom portion 52 toward the outer side in the radial direction. Therefore, since the fastening member 50c 3 has a structure inclined by a predetermined angle ⁇ with respect to the bottom portion 52, similarly to the first section 501c of the plastic processing unit 50c 1 , the terminal gasket 54 It is possible to provide sealing by compressing.
- the front end surface 50d of the protruding portion 50e has a flat flat portion D.
- the flat portion D may protrude more in the axial direction than the fastening member 50c 3 .
- the flat portion D may also maintain its size and shape without being affected by the fastening of the fastening member 50c 3 .
- a first sealing coating layer (f 1 ) is provided between the terminal gasket 54 and the bottom portion 52 of the battery housing (H). may be provided.
- the first sealing coating layer f 1 may be formed in advance on the bottom portion 52 and the through hole 53 of the battery housing H before installing the electrode terminal 50 in the through hole 53 .
- the second sealing coating layer (f 2 ) is applied to the externally exposed interface and/or fastening between the terminal gasket 54 and the bottom portion 52 of the battery housing (H).
- An externally exposed interface between the member 50c 3 and the terminal gasket 54 may be covered.
- the second sealing coating layer f 2 may be formed using a spray coating method after the installation of the electrode terminal 50 is completed.
- first sealing coating layer (f 1 ) and/or the second sealing coating layer (f 2 ) are optional elements, not essential elements.
- the first sealing coating layer (f 1 ) and/or the second sealing coating layer (f 2 ) may be made of a material that has excellent sealing properties and is resistant to electrolytes.
- a silicone resin, silicone acrylate, or polyamideimide may be used as a material for the sealing coating layers (f 1 , f 2 ), but the present invention is not limited thereto.
- the above-described fixing structure of the electrode terminal 50 according to the embodiment of the present invention can be applied to a cylindrical battery.
- the cylindrical battery may be, for example, a cylindrical battery with a form factor ratio (defined as the diameter of the cylindrical battery divided by its height) greater than approximately 0.4.
- the form factor means a sequence of numbers representing the diameter and height of a cylindrical battery.
- a cylindrical battery according to an embodiment of the present invention may be, for example, a 46110 battery, a 4875 battery, a 48110 battery, a 4880 battery, or a 4680 battery.
- the first two numbers represent the diameter of the battery, and the remaining numbers represent the height of the battery.
- a battery according to an embodiment of the present invention may be a cylindrical battery having a diameter of about 46 mm, a height of about 110 mm, and a form factor ratio of 0.418.
- a battery according to another embodiment may be a cylindrical battery having a diameter of about 48 mm, a height of about 75 mm, and a form factor ratio of 0.640.
- a battery according to another embodiment may be a cylindrical battery having a diameter of about 48 mm, a height of about 110 mm, and a form factor ratio of 0.436.
- a battery according to another embodiment may be a cylindrical battery having a diameter of about 48 mm, a height of about 80 mm, and a form factor ratio of 0.600.
- a battery according to another embodiment may be a cylindrical battery having a diameter of about 46 mm, a height of about 80 mm, and a form factor ratio of 0.575.
- batteries with a form factor ratio of approximately 0.4 or less have been used. That is, conventionally, for example, 1865 batteries and 2170 batteries have been used.
- 1865 batteries and 2170 batteries have been used.
- the diameter is approximately 18 mm
- the height is approximately 65 mm
- the form factor ratio is 0.277.
- the diameter is approximately 21 mm
- the height is approximately 70 mm
- the form factor ratio is 0.300.
- FIG. 8 is a cross-sectional view of a cylindrical battery 70 according to an embodiment of the present invention cut along a plane including an axial direction (Y) and a radial direction (Z).
- the sheet-shaped first electrode and the second electrode are wound with a separator interposed therebetween, and the uncoated portion 72 of the first electrode is exposed at the bottom.
- the upper part includes a jelly roll type electrode assembly 71 in which the uncoated portion 73 of the second electrode is exposed.
- the first electrode may be a negative electrode and the second electrode may be an anode.
- the reverse is also possible.
- the winding method of the electrode assembly 71 is substantially the same as the winding method of the electrode assembly used in manufacturing the tab-less cylindrical battery according to the prior art described with reference to FIG. 2 .
- the cylindrical battery 70 also includes a cylindrical battery housing H that accommodates the electrode assembly 71 and is electrically connected to the uncoated portion 72 of the first electrode.
- one side (lower part) of the battery housing (H) is open.
- the bottom portion 52 of the battery housing H has a structure in which the electrode terminal 50 is riveted to the through hole 53 through a caulking process.
- the cylindrical battery 70 may also include a terminal gasket 54 interposed between the electrode terminal 50 and the through hole 53 .
- Cylindrical battery 70 may also include a seal 74 sealing the open end of the battery housing H to be insulated from the battery housing H.
- the sealing body 74 may include a non-polar cap 74a and a sealing gasket 74b interposed between the edge of the cap 74a and the open end of the battery housing H.
- the cap 74a may be made of a conductive metal material such as aluminum, steel, or nickel.
- the sealing gasket 74b may be made of insulating and elastic polypropylene, polybutylene terephthalate, polyfluorinated ethylene, or the like.
- the present invention is not limited by the materials of the cap 74a and the sealing gasket 74b.
- the cap 74a may include a vent notch 77 that is ruptured when the pressure inside the battery housing H exceeds a critical value. Vent notches 77 may be formed on both sides of the cap 74a. The vent notches 77 may form a continuous or discontinuous circular pattern, a straight line pattern, or some other pattern on the surface of the cap 74a.
- the battery housing (H) in order to fix the sealing body (74), a crimping portion (75) extended and bent to the inside of the battery housing (H) to surround and fix the edge of the cap (74a) together with the sealing gasket (74b). ) may be included.
- the battery housing (H) may also include a beading portion 76 press-fitted into the battery housing (H) in a region adjacent to the open end.
- the beading portion 76 supports the edge of the sealing body 74, particularly the outer circumferential surface of the sealing gasket 74b, when the sealing body 74 is clamped by the crimping portion 75.
- the cylindrical battery 70 may further include a first current collector 78 welded to the uncoated portion 72 of the first electrode.
- the first current collector 78 is made of a conductive metal material such as aluminum, steel, or nickel.
- at least a portion 78a of an edge not in contact with the uncoated portion 72 of the first electrode is interposed between the beading portion 76 and the sealing gasket 74b to form a crimping portion ( 75) can be fixed.
- at least a portion 78a of an edge of the first current collector 78 may be fixed to the inner circumferential surface 76a of the beading portion 76 adjacent to the crimping portion 75 by welding.
- the cylindrical battery 70 may also include a second current collector 79 welded to the uncoated portion 73 of the second electrode.
- a second current collector 79 welded to the uncoated portion 73 of the second electrode.
- at least a portion of the second current collector 79, for example, the central portion 79a, may be welded to the flat portion D of the electrode terminal 50.
- the welding tool may be inserted through the cavity 80 existing in the core of the electrode assembly 71 to reach the welding point of the second current collector 79. .
- the electrode terminal 50 supports the welding area of the second current collector 79 when the second current collector 79 is welded to the flat portion D of the electrode terminal 50, strong pressure is applied to the welding area. welding quality can be improved.
- the area of the flat portion D of the electrode terminal 50 is large, a wide welding area can also be secured. Accordingly, the internal resistance of the cylindrical battery 70 can be reduced by lowering the contact resistance of the welding region.
- the face-to-face welding structure of the riveted electrode terminal 50 and the second current collector 79 is very useful for rapid charging using a high c-rate current. This is because the current density per unit area can be lowered in the cross section in the direction in which the current flows, so that the amount of heat generated in the current path can be lowered than before.
- any one of laser welding, ultrasonic welding, spot welding, and resistance welding may be used.
- the area of the flat portion D can be adjusted differently depending on the welding method, and is preferably 2 mm or more for welding strength and ease of the welding process.
- the diameter of the flat portion D is preferably 4 mm or more.
- welding strength can be secured, and there is no difficulty in performing the welding process by inserting the laser welding tool into the cavity 80 of the electrode assembly 71.
- the diameter of the flat portion D is preferably 2 mm or more.
- welding strength can be secured, and there is no difficulty in performing the welding process by inserting the ultrasonic welding tool into the cavity 80 of the electrode assembly 71.
- Cylindrical battery 70 may also further include an insulator 80 .
- the insulator 80 may be interposed between the second current collector 79 and the inner surface 52a of the bottom portion 52 and between the inner circumferential surface 51a of the sidewall of the battery housing H and the electrode assembly 71.
- the insulator 80 includes a welding hole 80a exposing the flat portion D of the electrode terminal 50 toward the second current collector 79, and the surface of the second current collector 79 and the electrode One side (upper) edge of the assembly 71 may be covered.
- the uncoated portions 72 and 73 of the first electrode and/or the second electrode are bent from the outer circumferential side of the electrode assembly 71 to the core side to form bent surfaces on the upper and lower portions of the electrode assembly 71.
- the first current collector 78 is welded to a curved surface formed by bending the uncoated portion 72 of the first electrode
- the second current collector 79 is formed by bending the uncoated portion 73 of the second electrode. It can be welded to the bent surface.
- the first electrode and/or the second electrode may have an improved structure different from that of the conventional electrode (see FIG. 1).
- 17 is a plan view exemplarily showing the structure of an electrode 90 according to a preferred embodiment of the present invention.
- the electrode 90 includes a sheet-shaped electrode current collector 91 made of a foil of a conductive material, an active material layer 92 formed on at least one surface of the electrode current collector 91, and an electrode current collector ( An uncoated portion 93 not coated with an active material is included at the long side end of 91).
- the uncoated portion 93 may include a plurality of notched segment pieces 93a.
- the plurality of segments 93a form a plurality of groups, and the segment segments 93a belonging to each group may have the same height (length in the Y direction) and/or width (length in the X direction) and/or the same spacing.
- the number of segments 93a belonging to each group may be increased or decreased than shown.
- the segmental segment 93a may have a trapezoidal shape, but may be deformed into a quadrangular shape, a parallelogram shape, a semicircular shape, or a semielliptical shape.
- the height of the segment 93a may increase stepwise from the core side to the outer circumferential side.
- the core-side uncoated portion 93' adjacent to the core side may not include the segment piece 93a, and the height of the core-side uncoated portion 93' may be smaller than other uncoated portion regions.
- the electrode 90 may include an insulating coating layer 94 covering a boundary between the active material layer 92 and the uncoated portion 93 .
- the insulating coating layer 94 includes an insulating polymer resin and may optionally further include an inorganic filler.
- the insulating coating layer 94 serves to prevent an end of the active material layer 92 from contacting an active material layer of opposite polarity through a separator and to structurally support the bending of the segment piece 93a. To this end, when the electrode 90 is wound into an electrode assembly, at least a portion of the insulating coating layer 94 is preferably exposed to the outside from the separator.
- FIG. 18 is a plane including an axial direction (Y) and a radial direction (Z) of the electrode assembly 100 in which the uncoated segmental structure of the electrode 90 according to an embodiment of the present invention is applied to the first electrode and the second electrode. It is a cross section cut into
- the electrode assembly 100 may be manufactured by the winding method described with reference to FIG. 2 .
- the protruding structures of the uncoated portions 72 and 73 extending outside the separator are shown in detail, and the first electrode, the second electrode, and the winding structure of the separator are omitted.
- the uncoated portion 72 protruding downward extends from the first electrode, and the uncoated portion 73 protrudes upward from the second electrode.
- a pattern in which the heights of the uncoated portions 72 and 73 change is schematically shown. That is, the heights of the uncoated portions 72 and 73 may vary irregularly depending on the position where the cross section is cut. For example, when the side portion of the trapezoidal segment 93a is cut, the height of the uncoated portion in the cross section is lower than that of the segmental segment 93a. Accordingly, it should be understood that the heights of the uncoated portions 72 and 73 shown in the cross-sectional drawing of the electrode assembly 100 correspond to the average of the heights of the uncoated portions included in each winding turn.
- the uncoated portions 72 and 73 may be bent from the outer circumferential side of the electrode assembly 100 to the core side.
- the bent portion 101 is indicated by a dotted line box.
- the bent surfaces 102 are formed on the upper and lower portions of the electrode assembly 100 while overlapping segment segments that are radially adjacent to each other in several layers.
- the core-side uncoated portion (93' in FIG. 17) has a low height and is not bent. equal to or smaller than the radial length (r) of the winding region. Therefore, the cavity 80 in the core of the electrode assembly 100 is not closed by the bent segments.
- the cavity 80 is not closed, there is no difficulty in the electrolyte injection process, and the electrolyte injection efficiency is improved.
- welding between the electrode terminal 50 and the second current collector 79 may be easily performed by inserting a welding tool through the cavity 80 .
- the cap 74a of the sealing body 74 does not have a polarity.
- the first current collector 78 is connected to the sidewall of the battery housing H, so that the outer surface 52a of the bottom portion 52 has a polarity opposite to that of the electrode terminal 50. Therefore, when connecting a plurality of cells in series and/or parallel, the outer surface 52a of the bottom portion 52 and the electrode terminal 50 are used to connect a bus bar in one direction of the cylindrical battery 70. wiring can be done. Through this, it is possible to improve energy density by increasing the number of cells that can be mounted in the same space.
- the positive electrode active material coated on the positive electrode and the negative electrode active material coated on the negative electrode may be used without limitation as long as they are known in the art.
- the cathode active material has the general formula A[A x M y ]O 2+z (A includes at least one element of Li, Na, and K; M is Ni, Co, Mn, Ca, Mg, Al, including at least one element selected from Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; 0 ⁇ x, 1 ⁇ x+y ⁇ 2, - 0.1 ⁇ z ⁇ 2; the stoichiometric coefficients of the components included in x, y, z and M are selected such that the compound maintains electrical neutrality).
- the cathode active material is an alkali metal compound disclosed in US6,677,082, US6,680,143, etc.
- xLiM 1 O 2 -(1-x)Li 2 M 2 O 3 (M 1 is at least one element having an average oxidation state of 3) M 2 includes at least one element having an average oxidation state of 4; 0 ⁇ x ⁇ 1).
- the cathode active material has the general formula Li a M 1 x Fe 1-x M 2 y P 1-y M 3 z O 4-z
- M 1 is Ti, Si, Mn, Co, Fe, V, Includes at least one element selected from Cr, Mo, Ni, Nd, Al, Mg, and Al
- M 2 is Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al , As, Sb, Si, Ge, includes at least one element selected from V and S
- M 3 includes a halogen group element optionally including F; 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1; the stoichiometric coefficients of the components included in a, x, y, z, M 1 , M 2 , and M 3 are selected such that the compound remains electrically neutral), or Li 3 M 2 (PO 4 ) 3 [M includes at least one element selected from Ti
- the cathode active material may include primary particles and/or secondary particles in which the primary particles are aggregated.
- the negative electrode active material may use a carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, or the like.
- Metal oxides such as TiO2 and SnO2 having a potential of less than 2V can also be used as an anode active material.
- the carbon material both low crystalline carbon and high crystalline carbon may be used.
- the separator is a porous polymer film, for example, a porous polymer film made of polyolefin-based polymers such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, and ethylene/methacrylate copolymer. Alternatively, they may be laminated and used. As another example, the separator may use a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, or the like.
- a coating layer of inorganic particles may be included on at least one surface of the separation membrane. Also, it is possible that the separation membrane itself is formed of a coating layer of inorganic particles. Particles constituting the coating layer may have a structure combined with a binder so that an interstitial volume exists between adjacent particles.
- the inorganic particles may be made of an inorganic material having a dielectric constant of 5 or more.
- the inorganic particles are Pb(Zr,Ti)O 3 (PZT), Pb 1-x La x Zr 1-y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 PbTiO 3 (PMN-PT), BaTiO 3 , hafnia (HfO 2 ), SrTiO 3 , TiO 2 , Al 2 O 3 , ZrO 2 , SnO 2 , CeO 2 , MgO, CaO, ZnO and Y 2 O 3 It may contain at least one or more materials selected from the group.
- the electrolyte may be a salt having a structure such as A + B - .
- a + includes alkali metal cations such as Li + , Na + , and K + or ions made of combinations thereof.
- B - is F - , Cl - , Br - , I - , NO 3 - , N(CN) 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - , SbF 6 - , AsF 6 - , BF 2 C 2 O 4 - , BC 4 O8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F9SO 3 - , CF 3 CF 2
- the electrolyte can also be used by dissolving it in an organic solvent.
- organic solvent propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), dipropyl carbonate (DPC) ), dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (N-methyl -2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), gamma butyrolactone ( ⁇ -butyrolactone) or mixtures thereof may be used.
- PC propylene carbonate
- EC ethylene carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- DPC dipropyl carbonate
- dimethyl sulfoxide acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofur
- the cylindrical battery according to the above-described embodiment may be used to manufacture a battery pack.
- 20 is a diagram schematically showing the configuration of a battery pack according to an embodiment of the present invention.
- a battery pack 200 includes an assembly to which cylindrical batteries 201 are electrically connected and a pack housing 202 accommodating them.
- the cylindrical battery 201 may be a battery according to the above-described embodiment.
- parts such as a bus bar, a cooling unit, and external terminals for electrically connecting the cylindrical batteries 201 are omitted.
- the battery pack 200 may be mounted on a vehicle.
- vehicle may be, for example, an electric vehicle, a hybrid vehicle, or a plug-in hybrid vehicle.
- Vehicles include four-wheeled vehicles or two-wheeled vehicles.
- FIG. 21 is a diagram for explaining a vehicle including the battery pack 200 of FIG. 20 .
- a vehicle V according to an embodiment of the present invention includes a battery pack 200 according to an embodiment of the present invention.
- the vehicle V operates by receiving power from the battery pack 200 according to an embodiment of the present invention.
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Abstract
Description
Claims (39)
- 일측에 개방단부가 구비되고 타측에 관통홀이 형성된 바닥부가 구비된 전지 하우징;상기 바닥부에 고정된 전극 단자; 및상기 전극 단자와 바닥부 사이에 개재된 단자 가스켓;을 포함하는 전극 단자의 고정 구조로서,상기 전극 단자는:상기 관통 홀의 단면보다 작은 단면을 구비하고 상기 관통 홀에 삽입된 네크부;상기 네크부의 일측 단부에 연결되고, 상기 관통 홀의 단면보다 큰 단면을 가지며 상기 바닥부의 일측 표면을 따라 연장된 헤드부;상기 네크부의 타측 단부에 연결되고, 상기 바닥부의 타측 표면으로부터 상기 전지 하우징의 축방향을 따라 연장된 돌출부;상기 돌출부로부터 원심방향으로 연장된 확경부; 및상기 돌출부의 축방향 단부에 마련된 선단면;을 구비하고,상기 확경부는, 상기 돌출부의 외주면에 물리적으로 결합된 체결부재인, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 돌출부의 외주면에는 둘레방향을 따라 형성되고 구심 방향으로 함몰된 체결홈이 마련되고,상기 체결부재는 상기 체결홈에 끼워져 고정되는, 전극 단자의 고정 구조.
- 청구항 2에 있어서,상기 체결홈은 수나사산 형상이고, 상기 체결부재는 상기 수나사산과 체결되는 암나사산이 형성된 너트인, 전극 단자의 고정 구조.
- 청구항 2에 있어서,상기 체결홈은 O형 홈이고, 상기 체결부재는 상기 O형 홈에 끼워지는 C형 링인, 전극 단자의 고정 구조.
- 청구항 2에 있어서,상기 체결부재가 상기 바닥부를 바라보는 표면은, 반경방향 외측으로 갈수록 상기 바닥부로부터 점점 멀어지는 측벽면을 포함하는, 전극 단자의 고정 구조.
- 청구항 5에 있어서,상기 체결부재가 상기 체결홈에 결합된 상태에 있을 때, 상기 측벽면은 상기 전지 하우징의 바닥부를 향해 상기 단자 가스켓을 압착시키는 것인, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 단자 가스켓과 상기 전지 하우징 바닥부 사이의 계면에 형성된 제1실링 코팅층을 더 포함하는, 전극 단자의 고정 구조.
- 청구항 7에 있어서,상기 제1실링 코팅층은, 실리콘 수지, 실리콘 아크릴레이트 또는 폴리아미드이미드를 포함하는, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 체결부재와 상기 단자 가스켓 사이의 외부 노출 계면을 덮는 제2실링 코팅층을 더 포함하는, 전극 단자의 고정 구조.
- 청구항 9에 있어서,상기 제2실링 코팅층은 상기 단자 가스켓과 상기 바닥부 사이의 외부 노출 계면을 덮는, 전극 단자의 고정 구조.
- 청구항 9 또는 청구항 10에 있어서,상기 제2실링 코팅층은, 실리콘 수지, 실리콘 아크릴레이트 또는 폴리아미드이미드를 포함하는, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 선단면은 상기 전지 하우징의 바닥면을 기준으로 상기 확경부보다 상기 전지 하우징의 축방향으로 더 돌출된, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 선단면은 표면이 평평한 평탄부를 포함하는, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 체결부재는, 상기 돌출부로부터 원심 방향으로 연장됨에 따라 상기 전지 하우징의 바닥부로부터 점점 멀어지는 제1구간을 구비하는, 전극 단자의 고정 구조.
- 청구항 14에 있어서,상기 제1구간에서 상기 체결부재가 상기 바닥부를 바라보는 면이 상기 바닥부와 이루는 각도는 0도 초과 60도 이하인, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 확경부는 상기 전지 하우징의 중심축과 수직 방향으로 자른 단면의 직경이 상기 관통 홀의 직경보다 큰 것인, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 확경부는 상기 전지 하우징의 중심축과 수직 방향으로 자른 단면의 직경이 상기 전지 하우징의 바닥부로부터 멀어질수록 점진적으로 증가하는, 전극 단자의 고정 구조.
- 청구항 1에 있어서,상기 헤드부와 상기 전지 하우징의 바닥부 사이에 개재된 단자 가스켓의 부분이 압착된 상태를 가지는, 전극 단자의 고정 구조.
- 제1전극과 제2전극이 분리막이 개재된 상태로 권취되고, 양측 단부로부터 연장되어 상기 분리막의 밖으로 노출된 상기 제1전극의 무지부와 상기 제2전극의 무지부를 포함하는 전극 조립체; 및일측에 개방단부를 구비하고 상기 개방단부를 통해 상기 전극 조립체를 수납하며 상기 제1전극과 전기적으로 연결된 전지 하우징;상기 전지 하우징의 바닥부에 형성된 관통 홀의 내벽과 접촉하지 않도록 상기 관통 홀을 통과하여 설치되며, 상기 제2전극과 전기적으로 연결된 전극 단자로서, 상기 관통 홀의 단면보다 작은 단면을 구비하고 상기 관통 홀에 삽입된 네크부; 상기 네크부의 일측 단부에 연결되고, 상기 관통 홀의 단면보다 큰 단면을 가지며 상기 바닥부의 일측 표면을 따라 연장된 헤드부; 상기 네크부의 타측 단부에 연결되고, 상기 바닥부의 타측 표면으로부터 상기 전지 하우징의 축방향을 따라 연장된 돌출부; 상기 돌출부로부터 원심방향으로 연장된 확경부; 및 상기 돌출부의 축방향 단부에 마련된 선단면;을 구비하고, 상기 확경부는, 상기 돌출부의 외주면에 물리적으로 결합되는 체결부재인, 전극 단자;상기 전극 단자와 상기 관통 홀 사이에 개재된 단자 가스켓; 및상기 전지 하우징으로부터 절연 가능하도록 상기 전지 하우징의 개방단부를 밀봉하는 밀봉체를 포함하는 것인, 배터리.
- 청구항 19에 있어서,상기 돌출부의 외주면에는 둘레방향을 따라 형성되고 구심 방향으로 함몰된 체결홈이 마련되고,상기 체결부재는 상기 체결홈에 끼워져 고정되는, 배터리.
- 청구항 20에 있어서,상기 체결홈은 수나사산 형상이고, 상기 체결부재는 상기 수나사산과 체결되는 암나사산이 형성된 너트인, 배터리.
- 청구항 20에 있어서,상기 체결홈은 O형 홈이고, 상기 체결부재는 상기 O형 홈에 끼워지는 C형 링인, 배터리.
- 청구항 20에 있어서,상기 체결부재가 상기 바닥부를 바라보는 표면은, 반경방향 외측으로 갈수록 상기 바닥부로부터 점점 멀어지는 측벽면을 포함하는, 배터리.
- 청구항 23에 있어서,상기 체결부재가 상기 체결홈에 결합된 상태에 있을 때 상기 측벽면은 상기 전지 하우징의 바닥부를 향해 상기 단자 가스켓을 압착시키는 것인, 배터리.
- 청구항 19에 있어서,상기 단자 가스켓과 상기 전지 하우징 바닥부 사이의 계면에 형성된 제1실링 코팅층을 더 포함하는, 배터리.
- 청구항 25에 있어서,상기 제1실링 코팅층은, 실리콘 수지, 실리콘 아크릴레이트 또는 폴리아미드이미드를 포함하는, 배터리.
- 청구항 19에 있어서,상기 체결부재와 상기 단자 가스켓 사이의 외부 노출 계면을 덮는 제2실링 코팅층을 더 포함하는, 배터리.
- 청구항 27에 있어서,상기 제2실링 코팅층은 상기 단자 가스켓과 상기 바닥부 사이의 외부 노출 계면을 덮는 것인, 배터리.
- 청구항 27 또는 청구항 28에 있어서,상기 제2실링 코팅층은, 실리콘 수지, 실리콘 아크릴레이트 또는 폴리아미드이미드를 포함하는, 배터리.
- 청구항 19에 있어서,상기 전지 하우징은 상기 개방단부에 인접한 영역에 상기 전지 하우징의 내측으로 압입된 비딩부를 포함하고,상기 밀봉체는, 극성이 없는 캡 및 상기 캡의 가장자리와 상기 전지 하우징의 개방단부 사이에 개재된 밀봉 가스켓을 포함하는, 배터리.
- 청구항 30에 있어서,상기 전지 하우징은, 상기 전지 하우징의 내측으로 연장 및 절곡되어 있고 상기 밀봉 가스켓과 함께 상기 캡의 가장자리를 감싸서 고정하는 클림핑부를 더 포함하는, 배터리.
- 청구항 31에 있어서,상기 제1전극의 무지부와 결합되는 제1집전체를 더 포함하고,상기 제1집전체는 상기 제1전극의 무지부와 접촉하지 않는 가장자리의 적어도 일부가 상기 비딩부와 상기 밀봉 가스켓 사이에 개재되어 상기 클림핑부에 의해 고정된, 배터리.
- 청구항 32에 있어서,상기 제1집전체의 가장자리의 적어도 일부는 상기 클림핑부와 인접한 상기 비딩부의 내주면에 용접을 통해 고정된, 배터리.
- 청구항 19에 있어서,상기 제2전극의 무지부와 결합되는 제2집전체를 더 포함하고,상기 제2집전체의 적어도 일부는 상기 전극 단자의 선단면에 용접된, 배터리.
- 청구항 34에 있어서,상기 제2집전체와 상기 전지 하우징의 바닥부 내주면 사이, 그리고 상기 전지 하우징의 측벽의 내주면과 상기 전극 조립체 사이에 개재된 인슐레이터를 더 포함하는, 배터리.
- 청구항 19에 있어서,상기 배터리의 직경을 높이로 나눈 폼 팩터의 비가 0.4 보다 큰 것인, 배터리.
- 청구항 19에 있어서,상기 배터리의 전극 단자와 전지 하우징 바닥부의 외부면을 통해 측정한 AC 저항은 4밀리오옴(miliohm) 이하인, 배터리.
- 청구항 19 내지 청구항 37 중 어느 한 항에 따른 복수의 배터리를 포함하는 배터리 팩.
- 청구항 38항에 따른 배터리 팩을 포함하는 자동차.
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JP4501361B2 (ja) * | 2003-06-05 | 2010-07-14 | パナソニック株式会社 | 二次電池 |
JP2008192552A (ja) * | 2007-02-07 | 2008-08-21 | Toyota Motor Corp | 電極 |
JP2010529624A (ja) * | 2007-06-07 | 2010-08-26 | エイ 123 システムズ,インク. | 高電流容量エネルギー供給装置用のキャップアセンブリ |
JP2016195036A (ja) * | 2015-03-31 | 2016-11-17 | 株式会社Gsユアサ | 蓄電素子及び蓄電素子の製造方法 |
KR20220083905A (ko) | 2020-12-11 | 2022-06-21 | 주식회사 포스코 | 성형성 및 표면품질이 우수한 고강도 도금강판 및 그 제조방법 |
CN113346201A (zh) * | 2021-05-21 | 2021-09-03 | 湖北亿纬动力有限公司 | 圆柱型电池、电池模组和电池包 |
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CN116169440A (zh) | 2023-05-26 |
JP2024506583A (ja) | 2024-02-14 |
CN218939960U (zh) | 2023-04-28 |
CA3237154A1 (en) | 2023-06-01 |
US20240055738A1 (en) | 2024-02-15 |
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