WO2014042400A1 - 적층형 이차전지 - Google Patents
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- WO2014042400A1 WO2014042400A1 PCT/KR2013/008163 KR2013008163W WO2014042400A1 WO 2014042400 A1 WO2014042400 A1 WO 2014042400A1 KR 2013008163 W KR2013008163 W KR 2013008163W WO 2014042400 A1 WO2014042400 A1 WO 2014042400A1
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- electrode plate
- electrode
- secondary battery
- outer cap
- stacked
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0463—Cells or batteries with horizontal or inclined electrodes
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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 of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/109—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure of button or coin shape
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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 of a single cell or a single battery
- 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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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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
- H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
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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 of a single cell or a single battery
- H01M50/102—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure
- H01M50/103—Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
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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
- H01M50/56—Cup shaped terminals
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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
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Definitions
- the present invention relates to a stacked secondary battery, and more particularly, to a structure for electrically connecting an electrode plate and an outer case of an electrode assembly so that the outer case serves as a terminal.
- Secondary Battery is a battery that can be charged and discharged, unlike a primary battery that can not be charged.
- a small portable battery such as a mobile phone, a notebook computer, or a camcorder
- a large capacity battery of a battery pack unit which is used in an electronic device and a plurality of battery cells are connected, it is widely used as a power source for driving a motor of a hybrid electric vehicle.
- Such secondary batteries include lithium-ion secondary batteries, nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries, lithium polymer secondary batteries, and the like, and are recently being spotlighted as super capacitors (Super Capacitors).
- the secondary battery may be classified into a coin-type secondary battery, a square secondary battery, and the like according to its external shape.
- the secondary battery may include an electrode assembly in which the positive electrode plate and the negative electrode plate are alternately stacked with a separator interposed therebetween, and an outer case made of a metal having an inner space for accommodating the electrode assembly.
- the secondary battery has an adhesive bond attached to the edge or edge of the electrode assembly so that the stacked state of the electrode assembly is not disturbed, that is, the alignment state of the positive electrode plate, the separator, and the negative electrode plate constituting the electrode assembly is not misaligned. It may further include a tape.
- the negative electrode plate or the positive electrode plate located on the outermost side of the electrode assembly may be configured to be in direct contact with the outer case (external cap or outer can) so that the outer cap or outer can serve as the negative terminal or the positive terminal.
- the electrode plate (cathode electrode plate or cathode electrode plate) located on the outermost side of the electrode assembly is configured to be in direct contact with the case (external cap or case can) so that the case serves as a terminal as described above, a predetermined thickness Due to the interference of the binding tape having the electrode, the electrode plate does not come into contact with the outer case as a whole and is partially separated from each other, and the unstable contact between the electrode plate and the outer case degrades the conductivity and consequently deteriorates the performance of the secondary battery. There was this. And this problem may occur even if there is any other component between the electrode plate and the outer case located on the outermost side of the electrode assembly, even if not the binding tape.
- An object of the present invention is a stacked type secondary battery including an electrode assembly in which a cathode electrode plate and an anode electrode plate are alternately stacked with a separator interposed therebetween, whereby a sufficient conductivity between the electrode plate and the outer case is stably ensured to ensure the performance of the secondary battery. It is to provide a laminated secondary battery that can be improved.
- the object of the present invention is to provide a plurality of first electrode plates and a plurality of second electrode plates alternately stacked with the first electrode plate with the separator interposed therebetween with a polarity opposite to the first electrode plate.
- An electrode assembly comprising; An outer can having an inner space for accommodating the electrode assembly; An outer cap coupled with the outer can to cover the open side of the outer can; A second electrode plate disposed between the outermost second electrode plate and the outer cap of the plurality of second electrode plates to electrically connect the second electrode plate and the outer cap, or to the outermost second electrode plate; Disposed between the outer can can be achieved by a stacked secondary battery comprising a conductive polymer film electrically connecting the second electrode plate and the outer can.
- the conductive polymer film may have a characteristic of a positive temperature coefficient (PTC) in which the electrical resistance increases rapidly with respect to a temperature rise when a specific temperature is reached.
- PTC positive temperature coefficient
- the stacked secondary battery may further include a binding tape attached to an edge of the electrode assembly such that the stacked state of the electrode assembly is not disturbed.
- the conductive polymer film may be disposed in a central region of the second electrode plate positioned at the outermost side so as not to overlap with the binding tape.
- the conductive polymer film may have an opening formed at a position corresponding to the binding tape so as not to overlap the binding tape.
- the conductive polymer film may have a thickness equal to or greater than the thickness of the binding tape.
- the conductive polymer film may contact one surface of the second electrode plate positioned at the outermost side and the other surface of the conductive polymer film to contact the outer cap or the outer can.
- the first electrode plate may be a positive electrode plate coated with a positive electrode active material
- the second electrode plate may be a negative electrode plate coated with a negative electrode active material
- the object of the present invention is to provide a plurality of first electrode plates and a plurality of second electrode plates alternately stacked with the first electrode plate with the separator interposed therebetween with a polarity opposite to the first electrode plate.
- An electrode assembly comprising; An outer can having an inner space for accommodating the electrode assembly; An outer cap coupled with the outer can to cover the open side of the outer can; A second electrode plate disposed between the outermost second electrode plate and the outer cap of the plurality of second electrode plates to electrically connect the second electrode plate and the outer cap, or to the outermost second electrode plate; Is disposed between the outer can can be electrically connected to the second electrode plate and the outer can, it can be achieved by a stacked secondary battery comprising a metal foam (Metal Foam) having a compressibility.
- Metal Foam Metal Foam
- the metal foam may be compressed between the electrode assembly and the outer cap to reduce the thickness in whole or in part, or may be compressed between the electrode assembly and the outer cap to reduce the thickness in whole or in part.
- the stacked secondary battery may further include a binding tape attached to an edge of the electrode assembly such that the stacked state of the electrode assembly is not disturbed.
- the metal foam may be disposed on the second electrode plate positioned at the outermost side to cover the binding tape.
- the metal foam may have a smaller thickness because portions overlapping with the binding tape are more compressed than portions overlapping with the binding tape.
- the metal foam may have a thickness before pressing that is greater than a thickness of the binding tape.
- the metal foam may contact one surface of the second electrode plate located at the outermost side, and the other surface may contact the outer cap or the outer can.
- the first electrode plate may be a positive electrode plate coated with a positive electrode active material
- the second electrode plate may be a negative electrode plate coated with a negative electrode active material
- the object of the present invention is to provide a plurality of first electrode plates and a plurality of second electrode plates alternately stacked with the first electrode plate with the separator interposed therebetween with a polarity opposite to the first electrode plate.
- An electrode assembly comprising; An outer can having an inner space for accommodating the electrode assembly; An outer cap coupled with the outer can to cover the open side of the outer can; A second electrode plate disposed between the outermost second electrode plate and the outer cap of the plurality of second electrode plates to electrically connect the second electrode plate and the outer cap, or to the outermost second electrode plate; And a conductive member disposed between the exterior cans to electrically connect the second electrode plate and the exterior cans.
- the present invention relates to a stacked secondary battery including an electrode assembly in which a cathode electrode plate and an anode electrode plate are alternately stacked with a separator interposed therebetween, wherein a conductive polymer film is disposed between an electrode plate and an outer case disposed at an outermost side of the electrode assembly, and is electrically conductive.
- a conductive polymer film is disposed between an electrode plate and an outer case disposed at an outermost side of the electrode assembly, and is electrically conductive.
- the present invention applies a conductive polymer film having a positive temperature coefficient (PTC) characteristic, when the secondary battery is overheated for some reason and the temperature exceeds the normal temperature range, the electrical resistance value of the conductive polymer film is increased. Since the electrode plate and the outer case can be electrically cut off rapidly, the risk of explosion due to overheating of the secondary battery can be prevented and ultimately, the safety of the secondary battery can be improved.
- PTC positive temperature coefficient
- the present invention relates to a stacked secondary battery including an electrode assembly in which a cathode electrode plate and an anode electrode plate are alternately stacked with a separator interposed therebetween, wherein a metal foam is disposed between an electrode plate and an outer case disposed at an outermost side of the electrode assembly, and a metal foam is formed.
- a metal foam is disposed between an electrode plate and an outer case disposed at an outermost side of the electrode assembly, and a metal foam is formed.
- the present invention is because the metal foam is a structure that can be crimped between the electrode assembly and the outer case, without being interfered with other components (eg, binding tape) existing between the electrode plate located on the outermost side of the electrode assembly and the outer case. It can be arranged, and as a result can maximize the area in contact with the electrode plate and the outer case to further improve the conductivity between the electrode plate and the outer case.
- other components eg, binding tape
- FIG. 1 is a schematic cross-sectional view illustrating a configuration of a stacked secondary battery according to an embodiment of the present invention.
- FIG. 2 is a schematic perspective view of an electrode assembly in the stacked rechargeable battery of FIG. 1.
- FIG. 3 is a schematic plan view of the electrode assembly of FIG. 2.
- FIG. 4 is a schematic front view of the electrode assembly of FIG. 2.
- FIG. 5 is a schematic plan view illustrating a conductive polymer film disposed on an electrode assembly in the stacked rechargeable battery of FIG. 1.
- FIG. 6 is an enlarged view of region 'A' of FIG. 1.
- FIG. 7 and 8 are schematic cross-sectional view and a plan view for explaining a modification of the conductive polymer film in the stacked secondary battery according to an embodiment of the present invention.
- 9 and 10 are schematic cross-sectional views for explaining the configuration of a stacked secondary battery according to another embodiment of the present invention.
- FIG. 11 is a schematic plan view illustrating a metal foam disposed on an electrode assembly in the stacked secondary battery of FIG. 9.
- FIG. 12 is an enlarged view of region 'A' of FIG. 10.
- FIG. 1 is a schematic cross-sectional view illustrating a configuration of a stacked secondary battery according to an embodiment of the present invention.
- the stacked rechargeable battery 100 may include exterior cases 110 and 120, an electrode assembly 130, a binding tape 140, and a conductive polymer film 150 that is a conductive member. .
- the present invention is not limited thereto, and the lithium-ion secondary battery of another appearance, as well as a nickel-cadmium secondary battery and a nickel-hydrogen secondary battery It can be applied to other various kinds of secondary batteries.
- the exterior cases 110 and 120 cover the open can 110 and the open side of the exterior can 110 having an interior space for accommodating the electrode assembly 130. It may be configured with an outer cap 120 to be coupled with.
- the outer can 110 and the outer cap 120 may be made of a metal material, for example, stainless steel so as to itself serve as a negative terminal or a positive terminal.
- the outer can 110 and the outer cap 120 may be electrically insulated by the gasket 115 made of an insulating synthetic resin, as shown in FIG. 1.
- the gasket 115 made of an insulating synthetic resin
- the exterior cases 110 and 120 may be injected with an electrolyte therein while the electrode assembly 130 is accommodated therein. Meanwhile, in the present exemplary embodiment, the exterior cases 110 and 120 have a flat coin shape, but the shapes of the exterior cases 110 and 120 may be appropriately changed.
- FIG. 2 is a schematic perspective view of an electrode assembly in the stacked secondary battery of FIG. 1
- FIG. 3 is a schematic plan view of the electrode assembly of FIG. 2
- FIG. 4 is a schematic front view of the electrode assembly of FIG. 2.
- the electrode assembly 130 has a plurality of first electrode plates 131, polarities opposite to the first electrode plates 131, and a first electrode with the separator 135 interposed therebetween.
- a plurality of second electrode plates 132 stacked alternately with the plate 131 may be included. That is, the electrode assembly 130 may have a structure in which the first electrode plate 131, the separator 135, and the second electrode plate 132 are sequentially stacked.
- the first electrode plate 131 will be described as being a positive electrode plate coated with a positive electrode active material, and the second electrode plate 132 is limited to a negative electrode plate coated with a negative electrode active material.
- the first electrode plate 131 may be a negative electrode plate coated with a negative electrode active material
- the second electrode plate 132 may be provided as a positive electrode plate coated with a positive electrode active material.
- Cathode electrode plates 132 may be disposed on both of the outermost sides of the electrode assembly 130 (both ends in the stacking direction) as shown in FIG. 4. Alternatively, the cathode electrode plate 132 may be disposed on one of the outermost sides of the electrode assembly 130, and the cathode electrode plate 131 may be disposed on the other thereof.
- the electrode assembly 130 is shown in a stacked structure in three stages using three cathode electrode plate 131 and four cathode electrode plate 132 for the sake of simplicity in the accompanying drawings, it is actually 10 In many cases, a single stacked stage is employed. However, the present invention is, of course, not limited to such a stacked stage.
- the positive electrode plate 131 may be provided by coating or coating a positive electrode active material such as lithium cobalt oxide on both sides of a substantially circular aluminum thin plate.
- the anode electrode plate 131 includes an anode protrusion 131a extending in one direction as shown in FIGS. 2 to 4, and these anode protrusions 131a are arranged in one state as shown in FIG. 1.
- the inner bottom of the outer can 110 is electrically connected by ultrasonic welding or the like. Thus, the outer can 110 may serve as a positive terminal.
- the cathode active material is not coated on the cathode protrusion 131a and is also exposed from the separator 135.
- the cathode electrode plate 132 may be provided by coating or coating an anode active material such as graphite on both surfaces or one surface of a substantially circular copper thin plate.
- the negative electrode plate 132 is coated on both sides of the negative electrode plate 132 except for the negative electrode plate 132 positioned at both outer and upper ends of the electrode assembly 130, that is, in FIG. 4.
- the negative electrode active material is applied only to the bottom surface of the negative electrode plate 132 positioned at the top end of the electrode assembly 130, and the negative electrode plate 132 located at the bottom end side of the electrode assembly 130 only has the top surface thereof.
- a negative electrode active material is apply
- an insulating seal 160 is disposed between the lower surface of the cathode electrode plate 132 positioned at the lowermost side of the electrode assembly 130 and the inner bottom surface of the outer can 110 to expose the outer can ( 110 and the negative electrode plate 132 may be insulated from each other.
- the insulating seal 160 may be provided in a tape structure made of polyethylene terephthalate (PET) or polyamide.
- PET polyethylene terephthalate
- the negative electrode plate 132 includes a negative electrode protrusion 132a extending in a direction opposite to the positive electrode protrusion 131a, and the negative electrode protrusions 132a are illustrated in FIG. 1. As shown in the drawing, they are electrically connected by ultrasonic welding or the like in one state. At this time, the negative electrode active material is not applied to the negative electrode protrusion 132a and is also exposed from the separator 135.
- the separator 135 may be disposed between the positive electrode plate 131 and the negative electrode plate 132 as shown in FIG. 4.
- the separator 135 is a means for insulating between the positive electrode plate 131 and the negative electrode plate 132.
- the separator 135 may be made of a porous microporous thin film made of polyethylene having excellent insulation properties to allow lithium ions to pass therethrough. Meanwhile, in the present exemplary embodiment, the separator 135 is simply disposed between the anode electrode plate 131 and the cathode electrode plate 132. However, the separator 135 covers both surfaces of the cathode electrode plate 131.
- It may be provided as a positive electrode plate made of a so-called 'pocketing technology' that is adhesively fixed by an insulating polymer film (not shown) in the state.
- a pocketing technique is disclosed in detail in Korean Patent Publication Nos. 10-0393484, 10-1048690, and the like.
- the binding tape 140 may be attached to an edge or an edge of the electrode assembly 130 so that the stacked state of the electrode assembly 130 is not disturbed. That is, the binding tape 140 is a means for binding the electrode assembly 130 to prevent misalignment of the positive electrode plate 131, the separator 135, and the negative electrode plate 132 constituting the electrode assembly 130. can do.
- the binding tape 140 may be made of polypropylene having excellent chemical resistance. Specifically, two binding tapes 140 are disposed at the edges of the electrode assembly 130 between the anode protrusion 131a and the cathode protrusion 132a, as shown in FIGS. 2 and 3, respectively.
- the 131a and 132a may be bonded to the electrode assembly 130 while being wound around the outer circumference of the electrode assembly 130 in a direction perpendicular to the extending direction.
- the binding tape 140 may be made of polypropylene having excellent chemical resistance.
- the number and attachment positions of the binding tape 140 are not limited to those disclosed in the present embodiment and may be appropriately changed.
- FIG. 5 is a schematic plan view illustrating a conductive polymer film disposed on an electrode assembly in the stacked secondary battery of FIG. 1, and FIG. 6 is an enlarged view of region 'A' of FIG. 1.
- the conductive polymer film 150 is a conductive member and has a cathode electrode plate 132 positioned on the outermost side of the plurality of cathode electrode plates 132 (that is, the electrode assembly 130 of FIG. 4). It is disposed between the cathode electrode plate 132 and the outer cap 120 disposed at the uppermost end to electrically connect or connect the cathode electrode plate 132 and the outer cap 120. Thus, the outer cap 120 may serve as a negative terminal. As illustrated in FIG. 1, the conductive polymer film 150 is configured such that one surface (lower surface) contacts the cathode electrode plate 132 located at the outermost side and the other surface (upper surface) contacts the outer cap 120. Can be.
- the conducting polymer film (150) is a film made of a conductive polymer that has a high conductivity despite being a polymer by doping an electron acceptor or electron donor to the polymer generally, doped with a representative conductive polymer Polyethylene, polypyrrole, polythiophene and the like.
- the outer electrode 120 is configured such that the negative electrode plate 132 located at the outermost side of the electrode assembly 130 is in direct contact with the outer cap 120 so that the outer cap 120 serves as a negative electrode terminal.
- the negative electrode plate 132 may not be in contact with the exterior cap 120 as a whole but partially spaced apart from each other.
- the unstable contact between the negative electrode plate 132 and the outer cap 120 has a problem of lowering conductivity and consequently degrading the performance of the secondary battery.
- the conductive polymer film 150 is configured to solve the problems of the prior art as described above, disposed between the cathode electrode plate 132 and the outer cap 120 located on the outermost side, and the cathode electrode plate 132 and By electrically connecting the outer cap 120, sufficient conductivity between the negative electrode plate 132 and the outer cap 120 may be stably secured, thereby improving the performance of the secondary battery.
- the conductive polymer film 150 is the center of the negative electrode plate 132 so as not to overlap or overlap with the binding tape 140 attached to the edge of the electrode assembly 130 as shown in FIGS. 1 and 5. May be placed in the area. Accordingly, the conductive polymer film 150 may stably maintain contact with the cathode electrode plate 130 and the outer cap 120 positioned on the outermost side without being affected by the binding tape 140. In addition, in order to ensure more stable contact, the conductive polymer film 150 preferably has a thickness T1 greater than the thickness T0 of the binding tape 140 as shown in FIGS. 1 and 6, and at least It should have the same thickness as the thickness T0 of the tape 140. Meanwhile, although the conductive polymer film 150 is illustrated in a disc shape in FIG. 5, the present invention is not limited thereto, and the plate shape of the conductive polymer film 150 may be appropriately changed.
- the conductive polymer film 150 may have a characteristic of a positive temperature coefficient (PTC). That is, the conductive polymer film 150 may be made of a polymer-based PTC device or a PCT polymer, which is recently used for overcurrent and overheating protection in various circuits.
- the characteristic of the constant temperature coefficient (PTC) refers to a characteristic in which the electrical resistance increases rapidly with respect to the temperature rise when a specific temperature is reached.
- the conductive polymer film 150 having the characteristic of the positive temperature coefficient (PTC) electrically connects the negative electrode plate 132 and the outer cap 120 as described above in the normal operating temperature range of the secondary battery 100.
- the present invention can prevent the explosion risk due to overheating of the secondary battery 100, and as a result, it is possible to improve the safety of the secondary battery 100.
- the negative electrode plate 132 is disposed on the outermost side (both ends in the stacking direction) of the electrode assembly 130, and the negative electrode plate 132 positioned on the outermost side (the uppermost side in FIG. 4) and
- the present invention has been described with reference to the configuration in which the conductive polymer film 150 is disposed between the outer cap 120, the present invention is not limited thereto.
- the anode electrode plate 131 may be disposed on the outermost side of the electrode assembly 130 and may be disposed.
- the conductive polymer film 150 is disposed between the anode electrode plate 131 located at the outside and the exterior cap 120, or between the anode electrode plate 131 located at the outermost side and the exterior can 110. 150 may be disposed.
- FIG. 7 and 8 are schematic cross-sectional view and a plan view for explaining a modification of the conductive polymer film in the stacked secondary battery according to an embodiment of the present invention.
- the conductive polymer film 150A is different from the conductive polymer film 150 illustrated in FIGS. 1 and 5 disposed only in the center region of the cathode electrode plate 132.
- the opening 151A may be formed at a position corresponding to the binding tape 140, as shown in FIG. 8 so as to be disposed in almost the entire area of the) and not overlap or overlap with the binding tape 140.
- the conductive polymer film 150A having such a configuration is the same as the conductive polymer film 150 illustrated in FIGS. 1 and 5, while avoiding interference with the binding tape 140, the conductive polymer film 150A may have a negative electrode plate ( Since the area in contact with the 132 and the outer cap 120 can be increased, conductivity between the negative electrode plate 132 and the outer cap 120 can be further improved.
- the shape of the opening 151A of the conductive polymer film 150A is not limited to the rectangular shape shown in FIG. 8 and may be appropriately changed.
- FIGS. 9 through 12 a stacked rechargeable battery according to another exemplary embodiment of the present invention will be described with reference to FIGS. 9 through 12 based on differences from the aforementioned exemplary embodiment.
- FIG. 9 and 10 are schematic cross-sectional views for explaining the configuration of a stacked secondary battery according to another embodiment of the present invention
- Figure 11 is a metal foam disposed on the electrode assembly in the stacked secondary battery of
- Figure 9 12 is a schematic plan view illustrating an enlarged area 'A' of FIG. 10.
- the stacked rechargeable battery 200 may include exterior cases 110 and 120, an electrode assembly 130, a binding tape 140, and a metal foam 250 as a conductive member.
- the outer case 110, 120 is an outer cap coupled to the outer can 110 to cover the open side of the outer can 110 and the outer can 110 is formed an inner space for accommodating the electrode assembly 130 120.
- the stacked rechargeable battery 200 according to the present exemplary embodiment may include an outer case in which the conductive polymer film 150 is replaced with the configured metal foam 250 in the stacked rechargeable battery 100 according to the above-described embodiment. Since the configurations of the 110, 120, the electrode assembly 130, and the binding tape 140 are substantially the same as those of the stacked secondary battery 100 according to the above-described embodiment, the same reference numerals are given to the same configurations. Will apply mutatis mutandis to the above-described embodiment.
- the metal foam 250 is a conductive member disposed between the cathode electrode plate 132 positioned on the outermost side of the plurality of cathode electrode plates 132 and the exterior cap 120 to form a cathode electrode plate. 132 and the outer cap 120 may be electrically connected or connected. Thus, the outer cap 120 may serve as a negative terminal. As shown in FIGS. 9 and 10, the metal foam 250 is in contact with the cathode electrode plate 132 positioned at the outermost side thereof, and the other side thereof is in contact with the outer cap 120. It can be configured to.
- the metal foam (150, Metal Foam) is a porous metal structure or a foamed metal structure made of a metal material such as aluminum, nickel, copper, brass, iron, and the like after exhaust treatment for vehicles / ships, industrial catalytic chemical process, industrial pad It is used for industrial filter, household filter and so on. Since the metal foam 250 is made of a metal material, the metal foam 250 has conductivity, and since the metal foam 250 has a porous structure including a plurality of pores, the metal foam 250 is compressed when external force is applied. For reference, in the present embodiment, a metal foam made of nickel, a so-called nickel foam (Ni Foam) is used, but the present invention is not limited thereto.
- Ni Foam nickel foam
- the cathode electrode plate 132 located at the outermost side of the electrode assembly 130 is configured to be in direct contact with the exterior cap 120 so that the exterior cap 120 serves as a cathode terminal.
- the negative electrode plate 132 may not be in contact with the exterior cap 120 as a whole but partially spaced apart from each other.
- the unstable contact between the negative electrode plate 132 and the outer cap 120 has a problem of lowering conductivity and consequently degrading the performance of the secondary battery.
- the metal foam 250 is configured to solve the problems of the prior art as described above, disposed between the cathode electrode plate 132 and the outer cap 120 located on the outermost side, the cathode electrode plate 132 and the exterior By electrically connecting the cap 120, sufficient conductivity between the negative electrode plate 132 and the outer cap 120 may be stably secured, thereby improving the performance of the secondary battery.
- the metal foam 250 may be compressed between the electrode assembly 130 and the outer cap 120 to reduce the thickness in whole or in part, since the metal foam 250 is a porous structure including a plurality of pores. It is possible.
- the metal foam 250 has an initial thickness T2 as shown in FIG. 9 before the compression, while the metal foam 250 is larger than the thickness T2 before the compression in the compressed state between the electrode assembly 130 and the outer cap 120. It may have a small thickness (T2-1, T2-2) as shown in Figs. Accordingly, the metal foam 250 may be disposed without interference of the binding tape 140 attached to the edge of the electrode assembly 130, resulting in contact with the negative electrode plate 132 and the outer cap 120. Since the area to be maximized, the conductivity between the cathode electrode plate 132 and the outer cap 120 may be further improved.
- the metal foam 250 is disposed on the outermost negative electrode plate 132 so as to cover the binding tape 140 attached to the edge of the electrode assembly 130 as shown in FIGS. 10 and 11. Can be.
- the thickness T2 before the pressing of the metal foam 250 should be larger than the thickness T0 of the binding tape 140. If the thickness T2 before the metal foam 250 is smaller than the thickness T0 of the binding tape 140, the metal foam 250 and the cathode electrode plate () may not be overlapped with the binding tape 140. 132) the separation may occur.
- the metal foam 250 may be compressed between the electrode assembly 130 and the outer cap 120 as described above, and thus, the negative electrode plate 132 or the outer cap ( It is possible to maintain a stable contact as a whole without separation with 132).
- the metal foam 250 has a thickness T 2-2 of the portion where the thickness T 2-2 overlaps with the binding tape 140 and does not overlap with the binding tape 140. Can be smaller than 1). That is, the metal foam 250 may have a smaller thickness because the portion overlapping with the binding tape 140 is more compressed than the portion not overlapping with the binding tape 140.
- FIG. 10 the metal foam 250 may have a thickness T 2-2 of the portion where the thickness T 2-2 overlaps with the binding tape 140 and does not overlap with the binding tape 140.
- the metal foam 250 is preferably provided in a size and shape to cover all regions of the cathode electrode plate 132 except for the cathode protrusion 132a, which is the cathode electrode plate 132. And to maximize the area in contact with the outer cap 120 to further increase the conductivity between the negative electrode plate 132 and the outer cap 120.
- the metal foam 250 is disposed in the central region of the cathode electrode plate 132 so as not to overlap with the binding tape 140 attached to the edge of the electrode assembly 130 differently from the embodiment disclosed herein, or the binding tape ( An opening may be formed at a position corresponding to the binding tape 140 so as not to overlap with the 140.
- the shape of the metal foam 250 is also not limited to that shown in FIG. 11 and may be appropriately changed.
- the cathode electrode plate 132 is disposed on the outermost side (both ends in the stacking direction) of the electrode assembly 130, and is disposed between the cathode electrode plate 132 positioned on the outermost side and the outer cap 120.
- the present invention has been described with reference to the configuration in which the metal foam 250 is disposed, the present invention is not limited thereto.
- the anode electrode plate 131 is disposed on the outermost side of the electrode assembly 130 and the anode electrode plate 131 is disposed on the outermost side.
- the metal foam 250 may be disposed between the outer cap 120 or the outermost outermost electrode plate 131 and the outer can 110. have.
- the present invention can be used in various types of secondary batteries such as nickel-cadmium secondary batteries, nickel-hydrogen secondary batteries, including lithium ion secondary batteries.
Abstract
Description
Claims (17)
- 복수 개의 제1 전극판과, 상기 제1 전극판과 반대되는 극성을 가지며 분리막을 사이에 두고 상기 제1 전극판과 교대로 적층되는 복수 개의 제2 전극판을 포함하는 전극 조립체;상기 전극 조립체를 수용하기 위한 내부 공간이 형성되는 외장 캔;상기 외장 캔의 개방된 측을 덮도록 상기 외장 캔과 결합하는 외장 캡; 및상기 복수 개의 제2 전극판 중 최외측에 위치한 제2 전극판과 상기 외장 캡 사이에 배치되어 상기 제2 전극판과 상기 외장 캡을 전기적으로 연결하거나, 상기 최외측에 위치한 제2 전극판과 상기 외장 캔 사이에 배치되어 상기 제2 전극판과 상기 외장 캔을 전기적으로 연결하는 전도성 고분자 필름;을 포함하는 것을 특징으로 하는 적층형 이차전지.
- 제1항에 있어서,상기 전도성 고분자 필름은,특정 온도에 도달하면 온도 상승에 대하여 전기 저항값이 급격히 증가하는 정온도계수(PTC, Positive Temperature Coefficient)의 특성을 갖는 것을 특징으로 하는 적층형 이차전지.
- 제1항에 있어서,상기 적층형 이차전지는,상기 전극 조립체의 적층된 상태가 흐트러지지 않도록 상기 전극 조립체의 가장자리에 부착되는 결속 테이프;를 더 포함하는 것을 특징으로 하는 적층형 이차전지.
- 제3항에 있어서,상기 전도성 고분자 필름은,상기 결속 테이프와 중첩되지 않도록 상기 최외측에 위치한 제2 전극판의 중앙 영역에 배치되는 것을 특징으로 하는 적층형 이차전지.
- 제3항에 있어서,상기 전도성 고분자 필름은,상기 결속 테이프와 중첩되지 않도록 상기 결속 테이프와 대응하는 위치에 개구가 형성되는 것을 특징으로 하는 적층형 이차전지.
- 제3항에 있어서,상기 전도성 고분자 필름은,상기 결속 테이프의 두께와 동일하거나 상기 결속 테이프의 두께보다 큰 두께를 갖는 것을 특징으로 하는 적층형 이차전지.
- 제1항에 있어서,상기 전도성 고분자 필름은,일면이 상기 최외측에 위치한 제2 전극판과 접촉하고, 타면이 상기 외장 캡 또는 상기 외장 캔과 접촉하는 것을 특징으로 하는 적층형 이차전지.
- 제1항에 있어서,상기 제1 전극판은 양극 활물질이 도포된 양극 전극판이고,상기 제2 전극판은 음극 활물질이 도포된 음극 전극판인 것을 특징으로 하는 적층형 이차전지.
- 복수 개의 제1 전극판과, 상기 제1 전극판과 반대되는 극성을 가지며 분리막을 사이에 두고 상기 제1 전극판과 교대로 적층되는 복수 개의 제2 전극판을 포함하는 전극 조립체;상기 전극 조립체를 수용하기 위한 내부 공간이 형성되는 외장 캔;상기 외장 캔의 개방된 측을 덮도록 상기 외장 캔과 결합하는 외장 캡; 및상기 복수 개의 제2 전극판 중 최외측에 위치한 제2 전극판과 상기 외장 캡 사이에 배치되어 상기 제2 전극판과 상기 외장 캡을 전기적으로 연결하거나, 상기 최외측에 위치한 제2 전극판과 상기 외장 캔 사이에 배치되어 상기 제2 전극판과 상기 외장 캔을 전기적으로 연결하되, 압축성을 갖는 메탈 폼(Metal Foam);을 포함하는 것을 특징으로 하는 적층형 이차전지.
- 제9항에 있어서,상기 메탈 폼은,상기 전극 조립체와 상기 외장 캡 사이에서 압착되어 전체적으로 또는 부분적으로 두께가 줄어들거나, 상기 전극 조립체와 상기 외장 캔 사이에서 압착되어 전체적으로 또는 부분적으로 두께가 줄어는 것을 특징으로 하는 적층형 이차전지.
- 제9항에 있어서,상기 적층형 이차전지는,상기 전극 조립체의 적층된 상태가 흐트러지지 않도록 상기 전극 조립체의 가장자리에 부착되는 결속 테이프;를 더 포함하는 것을 특징으로 하는 적층형 이차전지.
- 제11항에 있어서,상기 메탈 폼은,상기 결속 테이프를 덮도록 상기 최외측에 위치한 제2 전극판 상에 배치되는 것을 특징으로 하는 적층형 이차전지.
- 제12항에 있어서,상기 메탈 폼은,상기 결속 테이프와 중첩되는 부분이 상기 결속 테이프와 중첩되지 않은 부분에 비해 더 압착되어 더 작은 두께를 갖는 것을 특징으로 하는 적층형 이차전지.
- 제11항에 있어서,상기 메탈 폼은,압착 전의 두께가 상기 결속 테이프의 두께보다 큰 것을 특징으로 하는 적층형 이차전지.
- 제9항에 있어서,상기 메탈 폼은,일면이 상기 최외측에 위치한 제2 전극판과 접촉하고, 타면이 상기 외장 캡 또는 상기 외장 캔과 접촉하는 것을 특징으로 하는 적층형 이차전지.
- 제9항에 있어서,상기 제1 전극판은 양극 활물질이 도포된 양극 전극판이고,상기 제2 전극판은 음극 활물질이 도포된 음극 전극판인 것을 특징으로 하는 적층형 이차전지.
- 복수 개의 제1 전극판과, 상기 제1 전극판과 반대되는 극성을 가지며 분리막을 사이에 두고 상기 제1 전극판과 교대로 적층되는 복수 개의 제2 전극판을 포함하는 전극 조립체;상기 전극 조립체를 수용하기 위한 내부 공간이 형성되는 외장 캔;상기 외장 캔의 개방된 측을 덮도록 상기 외장 캔과 결합하는 외장 캡; 및상기 복수 개의 제2 전극판 중 최외측에 위치한 제2 전극판과 상기 외장 캡 사이에 배치되어 상기 제2 전극판과 상기 외장 캡을 전기적으로 연결하거나, 상기 최외측에 위치한 제2 전극판과 상기 외장 캔 사이에 배치되어 상기 제2 전극판과 상기 외장 캔을 전기적으로 연결하는 전도성 부재;를 포함하는 것을 특징으로 하는 적층형 이차전지.
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/427,125 US20150221925A1 (en) | 2012-09-11 | 2013-09-10 | Stacked type secondary battery |
EP13836582.0A EP2897194A4 (en) | 2012-09-11 | 2013-09-10 | STACK TYPE BATTERY |
CN201380047330.XA CN104620412A (zh) | 2012-09-11 | 2013-09-10 | 叠层二次电池 |
JP2015531018A JP2015533013A (ja) | 2012-09-11 | 2013-09-10 | 積層型2次電池 |
Applications Claiming Priority (4)
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KR1020120100336A KR101373229B1 (ko) | 2012-09-11 | 2012-09-11 | 적층형 이차전지 |
KR10-2012-0100332 | 2012-09-11 | ||
KR10-2012-0100336 | 2012-09-11 | ||
KR1020120100332A KR101373218B1 (ko) | 2012-09-11 | 2012-09-11 | 적층형 이차전지 |
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WO2014042400A1 true WO2014042400A1 (ko) | 2014-03-20 |
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US (1) | US20150221925A1 (ko) |
EP (1) | EP2897194A4 (ko) |
JP (1) | JP2015533013A (ko) |
CN (1) | CN104620412A (ko) |
WO (1) | WO2014042400A1 (ko) |
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KR102275331B1 (ko) * | 2014-10-30 | 2021-07-12 | 삼성에스디아이 주식회사 | 이차 전지 |
EP3151304B1 (de) * | 2015-10-02 | 2018-07-25 | VARTA Microbattery GmbH | Knopfzelle auf lithium-ionen-basis |
CN108780913B (zh) * | 2016-03-14 | 2022-06-28 | 株式会社村田制作所 | 蓄电设备 |
JP6465085B2 (ja) * | 2016-08-12 | 2019-02-06 | 株式会社豊田中央研究所 | 電流遮断素子及びその製造方法 |
JP6414577B2 (ja) * | 2016-09-16 | 2018-10-31 | トヨタ自動車株式会社 | 積層型電池 |
KR102455449B1 (ko) | 2018-10-05 | 2022-10-18 | 주식회사 엘지에너지솔루션 | 이차전지 |
CN209401756U (zh) | 2018-12-29 | 2019-09-17 | 宁德时代新能源科技股份有限公司 | 二次电池和电池模组 |
KR102158737B1 (ko) * | 2019-02-14 | 2020-09-22 | 주식회사 유앤에스에너지 | 전극용 집전체 |
EP3748710A1 (en) * | 2019-06-04 | 2020-12-09 | Renata AG | Cell battery |
CN114747082A (zh) * | 2019-11-29 | 2022-07-12 | 东莞新能德科技有限公司 | 电池 |
CN113363631B (zh) * | 2021-06-28 | 2023-11-03 | 宁德新能源科技有限公司 | 电池和具有所述电池的用电装置 |
WO2023191048A1 (ja) * | 2022-03-31 | 2023-10-05 | マクセル株式会社 | 全固体電池 |
KR20240027807A (ko) * | 2022-08-03 | 2024-03-04 | 맥셀 주식회사 | 전기 화학 소자 |
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Also Published As
Publication number | Publication date |
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EP2897194A4 (en) | 2016-08-10 |
JP2015533013A (ja) | 2015-11-16 |
US20150221925A1 (en) | 2015-08-06 |
EP2897194A1 (en) | 2015-07-22 |
CN104620412A (zh) | 2015-05-13 |
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