US20210159562A1 - Battery - Google Patents

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Publication number
US20210159562A1
US20210159562A1 US16/960,840 US202016960840A US2021159562A1 US 20210159562 A1 US20210159562 A1 US 20210159562A1 US 202016960840 A US202016960840 A US 202016960840A US 2021159562 A1 US2021159562 A1 US 2021159562A1
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US
United States
Prior art keywords
curved
electrode assembly
battery according
curved metal
metal shell
Prior art date
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Abandoned
Application number
US16/960,840
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English (en)
Inventor
Dongge HU
Weifeng HAN
Bin Liu
Tao Wang
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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Assigned to NINGDE AMPEREX TECHNOLOGY LIMITED reassignment NINGDE AMPEREX TECHNOLOGY LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAN, Weifeng, HU, DONGGE, LIU, BIN, WANG, TAO
Publication of US20210159562A1 publication Critical patent/US20210159562A1/en
Priority to US18/593,227 priority Critical patent/US20240213586A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • 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
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/317—Re-sealable arrangements
    • 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
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/543—Terminals
    • H01M50/545—Terminals formed by the casing of 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
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • Embodiments of the present application relate to the technical field of electrochemical devices, and more particularly to a battery.
  • Rectangular lithium ion batteries are currently the most commonly used secondary lithium ion batteries. They are commonly used in mobile electronic equipment, such as mobile phones and tablet computers. But in recent years, the demand of wearable equipment is increasing more and more. This requires curved batteries with a certain curvature to meet the requirements of ergonomic features, further increase the space utilization ratio of the equipment, and increase the energy of the battery.
  • An object of the present application is to provide a battery, which improves the structure of the curved batteries in the prior art and effectively solves many problems existing in the curved batteries in the prior art.
  • a battery including: a curved metal shell, a curved metal plate, and a curved electrode assembly.
  • the curved metal shell has a curved surface and a plurality of side walls extending from the curved surface, and the curved electrode assembly is disposed between the curved metal shell and the curved metal plate.
  • the plurality of side walls are bound with the curved metal plate to seal the curved electrode assembly between the curved metal shell and the curved metal plate.
  • the curved metal shell has the curved surface and the plurality of side walls extending from the curved surface, and the plurality of side walls are bound with the curved metal plate to seal the curved electrode assembly between the curved metal shell and the curved metal plate. Therefore, the manufacturing process difficulty of the battery is greatly reduced, curved electrode assemblies in different structural forms can be placed into the curved metal shell more conveniently and smoothly, and the energy density of the battery is also increased.
  • the plurality of side walls include a first flange
  • the curved metal plate includes a second flange
  • the plurality of side walls are bound with the second flange of the curved metal plate through the first flange.
  • the plurality of side walls include a first side, a second side adjacent to the first side, a third side opposite to the first side, and a fourth side opposite to the second side.
  • the first side and the third side are horizontal sides
  • the second side and the fourth side are curved sides.
  • the first side, the second side, the third side, and the fourth side are all horizontal sides.
  • the curved electrode assembly includes a groove or is formed with steps.
  • the curved electrode assembly and the curved metal shell have a same curvature radius, and the curvature radius is greater than 8 mm.
  • the curved electrode assembly is a wound structure, the curved electrode assembly includes a cathode, an anode, and a separator, and the separator is disposed between the cathode and the anode; and a middle portion of the cathode is provided with a cathode tab, and a middle portion of the anode is provided with an anode tab.
  • the curved electrode assembly is a wound structure, and the curved electrode assembly includes a plurality of cathode tabs and a plurality of anode tabs.
  • one of the plurality of side walls has a first electrode terminal and a second electrode terminal; and the first electrode terminal is electrically connected to the cathode tab, and the second electrode terminal is electrically connected to the anode tab.
  • FIG. 1 is a schematic structural view of a battery according to an embodiment of the present application.
  • FIG. 2 is a schematic exploded structural view of the battery shown in FIG. 1 ;
  • FIG. 3 is a schematic exploded structural view of a battery according to another embodiment of the present application.
  • FIG. 4 is a schematic structural view of a curved metal shell according to another embodiment of the present application.
  • FIG. 5 is a schematic structural view of a curved metal plate according to another embodiment of the present application.
  • FIG. 6 is a schematic structural view of a battery according to another embodiment of the present application.
  • FIG. 7 is a schematic structural view of a curved electrode assembly according to another embodiment of the present application.
  • FIG. 8 is a schematic structural view of a curved electrode assembly according to another embodiment of the present application.
  • FIG. 9 is a schematic structural view of a curved electrode assembly according to another embodiment of the present application.
  • FIG. 10 is a schematic structural view of a curved electrode assembly according to another embodiment of the present application.
  • FIG. 11 is a schematic view of a tab of a wound curved electrode assembly in a middle position of an electrode according to another embodiment of the present application.
  • FIG. 12 is a schematic structural view of a plurality of tabs of a wound curved electrode assembly according to another embodiment of the present application.
  • relativistic wordings such as “in an arc length direction”, “central”, “longitudinal”, “lateral”, “front”, “back”, “right”, “left”, “inner”, “outer”, “relatively low”, “relatively high”, “horizontal”, “vertical”, “higher than”, “lower than”, “above”, “below”, “top”, “bottom”, and their derived wordings (such as “horizontally”, “downward”, and “upward”) should be construed as referenced directions described in discussion or shown in the appended drawings. These relativistic wordings are merely used for ease of description, and do not require constructing or operating the present application in a specific direction.
  • the term “about” is used to describe and explain minor changes.
  • the term may refer to an example in which the event or circumstance occurs precisely, and an example in which the event or circumstance occurs approximately.
  • the term may refer to a variation range of less than or equal to ⁇ 10% of the value, for example, less than or equal to ⁇ 5%, less than or equal to ⁇ 4%, less than or equal to ⁇ 3%, less than or equal to ⁇ 2%, less than or equal to ⁇ 1%, less than or equal to ⁇ 0.5%, less than or equal to ⁇ 0.1%, or less than or equal to ⁇ 0.05%.
  • FIG. 1 is a schematic structural view of a battery according to some embodiments of the present application.
  • FIG. 2 is a schematic exploded structural view of the battery shown in FIG. 1 .
  • the battery includes a curved metal shell 10 , a curved metal plate 14 , and a curved electrode assembly 12 located between the curved metal shell 10 and the curved metal plate 14 .
  • the curved metal shell 10 has a curved surface 101 and a plurality of side walls 102 a, 102 b, 102 c, and 102 d extending from the curved surface 101 .
  • the curved surface 101 of the curved metal shell 10 and the plurality of side walls 102 a, 102 b, 102 c, and 102 d extending from the curved surface 101 together form an opening 103 along a thickness direction of the curved metal shell 10 .
  • the thickness direction is shown in FIG.
  • the curved electrode assembly 12 and tabs 121 and 122 located at a front end of the curved electrode assembly 12 are all disposed in the opening 103 .
  • the tabs 121 and 122 may be a cathode tab and an anode tab respectively.
  • the configuration of the cathode tab and the anode tab can be determined according to actual needs, and is not limited thereto.
  • the tab 121 may be an anode tab
  • the tab 122 may be a cathode tab.
  • the curved electrode assembly 12 is fixedly disposed in the opening 103 of the curved metal shell 10 by a bonding manner.
  • the bonding may be achieved by using glue, a double-sided tape or the like, but is not limited thereto.
  • the curved metal plate 14 is also covered above the curved electrode assembly 12 .
  • the curved metal plate 14 is bound with the plurality of side walls 102 a, 102 b, 102 c , and 102 d of the curved metal shell 10 to seal the curved electrode assembly 12 between the curved metal shell 10 and the curved metal plate 14 .
  • the curved metal plate 14 may be bound with the plurality of side walls 102 a , 102 b, 102 c, and 102 d by a welding (for example, laser welding), but the manner of bounding is not limited thereto.
  • the tabs 121 and 122 and the curved electrode assembly 12 may also be bound by a welding (for example, laser welding), but the bounding manner is not limited thereto.
  • the curved metal shell 10 having four side walls 102 a, 102 b, 102 c, and 102 d is shown in FIG. 1 and FIG. 2 , as long as the side walls can form the opening 103 with the curved surface 101 of the curved metal shell 10 , those skilled in the art can dispose any number of side walls according to actual needs without being limited thereto.
  • the structure of the curved metal plate 14 may also be changed as the structure of the curved metal shell 10 changes, so that the curved electrode assembly 12 is sealed between the curved metal shell 10 and the curved metal plate 14 .
  • the plurality of side walls 102 a, 102 b, 102 c, and 102 d respectively correspond to four sides in a direction of the opening 103 of the curved metal shell 10 , that is, a first side 104 a, a second side 104 b adjacent to the first side 104 a, a third side 104 c opposite to the first side 104 a, and a fourth side 104 d opposite to the second side 104 b.
  • the second side 104 b and the fourth side 104 d are both horizontal sides
  • the first side 104 a and the third side 104 c are both curved sides.
  • the first side 104 a, the second side 104 b, the third side 104 c, and the fourth side 104 d may also be all horizontal sides.
  • a material of the curved metal shell 10 and the curved metal plate 14 may be steel, aluminum, or other metals or alloys.
  • the curved metal shell 10 and the curved electrode assembly 12 each have a certain curvature.
  • a curvature radius of curved surfaces of the curved metal shell 10 and the curved electrode assembly 12 may be any curvature radius greater than 8 mm.
  • the curved metal shell 10 further includes terminals 105 and 106 and an explosion-proof valve 108 .
  • the terminals 105 and 106 are located on the side wall 102 a, and are respectively electrically connected to the tabs 121 and 122 disposed in the opening 103 by a welding (for example, laser welding), but the electrical connection manner is not limited thereto.
  • the terminals 105 and 106 may be a cathode terminal and an anode terminal respectively.
  • the specific configuration of the cathode terminal and the anode terminal may be determined according to the configuration of the tabs 121 and 122 , and is not limited thereto.
  • the terminals 105 and 106 are connected to a cathode and an anode of an external circuit respectively, to electrically connect the curved electrode assembly 12 to the external circuit through the tabs 121 and 122 respectively electrically connected to the terminals 105 and 106 .
  • the explosion-proof valve 108 is used to release gas generated in the opening 103 of the curved metal shell 10 .
  • peripheries of the terminals 105 and 106 are further provided with insulating and sealing components 109 and 110 respectively.
  • the insulating and sealing components 109 and 110 function to electrically insulate the terminals 105 and 106 from the side wall 102 a of the curved metal shell 10 respectively and prevent an external liquid from entering the opening 103 of the curved metal shell 10 through a gap between the side wall 102 a and the terminal 105 or 106 .
  • the insulating and sealing components 109 and 110 may be any insulating material, such as plastic and rubber.
  • FIG. 3 is a schematic exploded structural view of a battery according to other embodiments of the present application.
  • the battery shown in FIG. 3 is substantially the same as the battery shown in FIG. 1 to FIG. 2 except positions of the tabs 121 and 122 .
  • the tab 122 is still at the front end of the curved electrode assembly 12
  • the tab 121 is at a rear end of the curved electrode assembly 12 .
  • the terminal 106 is still disposed at the side wall 102 a of the curved metal shell 10
  • the terminal 105 is disposed at the side wall 102 c of the curved metal shell 10 .
  • the tabs 121 and 122 are simultaneously disposed at the rear end of the curved electrode assembly 12 (not shown), and meanwhile, positions of the terminals 105 and 106 are correspondingly modified according to the positions of the tabs 121 and 122 such that they are located at the side wall 102 d of the curved metal shell 10 .
  • FIG. 4 is a schematic structural view of a curved metal shell according to other embodiments of the present application.
  • FIG. 5 is a schematic structural view of a curved metal plate according to other embodiments of the present application.
  • FIG. 6 is a schematic structural view of a battery according to other embodiments of the present application.
  • the structures of the battery, the curved metal shell 40 , and the curved metal plate 44 shown in FIG. 4 to FIG. 6 are substantially the same as those shown in FIG. 1 to FIG. 2 , except that the battery, the curved metal shell 40 , and the curved metal plate 44 shown in FIG. 4 to FIG. 6 are also provided with flanges 46 b and 46 d on side walls 402 b and 402 d of the curved metal shell 40 respectively, and corresponding positions of the curved metal plate 44 are also provided with flanges 48 b and 48 d respectively.
  • the flanges 46 b and 46 d on the side walls 402 b and 402 d of the curved metal shell 40 are matched and bound with the flanges 48 b and 48 d on the curved metal plate 44 by a welding (for example, laser welding) manner respectively, thereby more effectively sealing the curved electrode assembly 12 between the curved metal shell 40 and the curved metal plate 44 .
  • a welding for example, laser welding
  • the flanges 46 b, 46 d, 48 b, and 48 d are not necessary, and the specific number of flanges can be set arbitrarily. For example, as shown in FIG. 1 to FIG. 2 , no flanges are disposed, or the four side walls of the curved metal shell 40 and the four sides of the curved metal plate are correspondingly provided with flanges.
  • the battery structure shown in FIG. 1 can be obtained by trimming the flanges 46 b, 46 d, 48 b, and 48 d of the battery shown in FIG. 6 .
  • the flanges of the battery shown in FIG. 6 are trimmed such that only flanges of about 0.5 mm-3 mm are retained.
  • FIG. 7 to FIG. 10 are schematic structural views of curved electrode assemblies according to other embodiments of the present application.
  • FIG. 2 to FIG. 3 of the present application both show the curved electrode assembly 12 having a complete curved surface.
  • the curved electrode assembly may also have other structural forms.
  • the curved electrode assembly may be a two-dimensional special-shaped curved electrode assembly having a groove structure or an irregular protruding structure in a direction of the curved surface in a partial region.
  • the curved electrode assembly 12 has a groove structure 52 in a middle position in the direction of the curved surface.
  • the curved electrode assembly 12 has a groove structure 54 in a corner position in the direction of the curved surface.
  • the groove structure may also be located in other positions of the curved electrode assembly 12 , and is not limited thereto.
  • the curved electrode assembly 12 may also be a three-dimensional special-shaped curved electrode assembly having a locally irregular protruding portion in a thickness direction. As shown in FIG. 9 to FIG. 10 , partial regions of the curved electrode assembly 12 on the curved surface are superposed to form a stepped structure 62 / 64 having steps.
  • the curved electrode assembly includes a cathode containing a cathode material, an anode containing an anode material, and a separator.
  • the separator is disposed between the cathode and the anode.
  • the cathode and the anode may be made of a metal material, for example, copper foil and aluminum foil, but are not limited thereto.
  • the curved electrode assembly in the present application can be manufactured by a conventional method known to those skilled in the art.
  • the curved electrode assembly is formed by sequentially winding or stacking the cathode, the separator, and the anode.
  • FIG. 11 is a schematic view of a tab of a wound curved electrode assembly in a middle position of an electrode according to other embodiments of the present application.
  • a middle portion of a cathode 72 of the wound curved electrode assembly is provided with a cathode tab 722
  • a middle portion of an anode 74 is provided with an anode tab 742 .
  • Such disposition of the tabs can effectively reduce the impedance of the curved electrode assembly, thereby enhancing the ability of quick charge and reducing the temperature rise.
  • FIG. 12 is a schematic structural view of a plurality of tabs of a wound curved electrode assembly according to other embodiments of the present application.
  • a cathode 82 and an anode 84 of the wound curved electrode assembly are provided with a plurality of tabs 822 and 842 respectively.
  • one tab 822 of the plurality of tabs 822 is retained for each turn of the cathode 82
  • one tab 842 of the plurality of tabs 842 is retained for each turn of the anode 84 .
  • Such disposition of tabs disclosed in FIG. 12 can also reduce the impedance of the curved electrode assembly, thereby enhancing the ability of quick charge and reducing the temperature rise.
  • the curved electrode assembly having a complete curved surface, and the two-dimensional special-shaped curved electrode assemblies and the three-dimensional curved electrode assemblies such as those shown in FIG. 7 to FIG. 10 can all be horizontally placed into the curved metal shell easily, so that the difficulty in the manufacturing process of the battery is greatly reduced, and the control of the placement position of the curved electrode assembly is more accurate.
  • the two-dimensional special-shaped curved electrode assemblies and the three-dimensional curved electrode assemblies such as those shown in FIG. 7 to FIG. 10 , they may also be made to be better matched with the space structure of the battery, thereby increasing the space utilization ratio of the battery and increasing the energy density of the battery.
  • the cathode includes a cathode material capable of absorbing and releasing lithium (Li) (hereinafter, sometimes referred to as “a cathode material capable of absorbing/releasing lithium Li”).
  • a cathode material capable of absorbing/releasing lithium Li include one or more of lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminum oxide, lithium manganate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium oxo-vanadium phosphate, lithium iron phosphate, lithium titanate and lithium-rich manganese-based material.
  • the chemical formula of the lithium cobalt oxide may be LixCoaM1bO2-c, wherein M1 is at least one selected from nickel (Ni), manganese (Mn), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr), ferrum (Fe), cuprum (Cu), zinc (Zn), molybdenum (Mo), stannum (Sn), calcium (Ca), strontium (Sr), wolfram (W), yttrium (Y), lanthanum (La), zirconium (Zr) and silicon (Si), and the values of x, a, b and c are respectively in the following ranges: 0.8 ⁇ x ⁇ 1.2, 0.8 ⁇ a ⁇ 1, 0 ⁇ b ⁇ 0.2 and ⁇ 0.1 ⁇ c ⁇ 0.2;
  • the chemical formula of the lithium nickel cobalt manganese oxide or the lithium nickel cobalt aluminum oxide may be LiyNidM2eO2-f, wherein M2 is at least one selected from cobalt (Co), manganese (Mn), magnesium (Mg), aluminum (Al), boron (B), titanium (Ti), vanadium (V), chromium (Cr), ferrum (Fe), cuprum (Cu), zinc (Zn), molybdenum (Mo), stannum (Sn), calcium (Ca), strontium (Sr), wolfram (W), zirconium (Zr) and silicon (Si), the values of y, d, e and f are respectively in the following ranges: 0.8 ⁇ y ⁇ 1.2, 0.3 ⁇ d ⁇ 0.98, 0.02 ⁇ e ⁇ 0.7 and ⁇ 0.1 ⁇ f ⁇ 0.2;
  • the chemical formula of the lithium manganate is LizMn2-gM3gO4-h, wherein M3 is at least one selected from cobalt (Co), nickel (Ni), magnesium (Mg), aluminum (Al), boron (B), titanium
  • z, g and h are respectively in the following ranges: 0.8 ⁇ z ⁇ 1.2, 0 ⁇ g ⁇ 1.0 and ⁇ 0.2 ⁇ h ⁇ 0.2.
  • the anode includes an anode material capable of absorbing and releasing lithium (Li) (hereinafter, sometimes referred to as “an anode material capable of absorbing/releasing lithium Li”).
  • an anode material capable of absorbing/releasing lithium (Li) include carbon materials, metal compounds, oxides, sulfides, nitrides of lithium such as LiN3, lithium metal, metals forming alloys together with lithium, and polymer materials.
  • Examples of the carbon material include lowly graphitized carbon, easily graphitizable carbon, artificial graphite, natural graphite, mesocarbon microbeads, soft carbon, hard carbon, pyrolytic carbon, coke, glassy carbon, organic polymer compound sintered bodies, carbon fibers and activated carbon.
  • the coke may include pitch coke, needle coke and petroleum coke.
  • the organic polymer compound sintered body refers to a material obtained by calcining a polymer material such as a phenol plastic or a furan resin at a suitable temperature to carbonize it, and some of these materials are classified into lowly is graphitized carbon or easily graphitizable carbon.
  • Examples of the polymer material include polyacetylene and polypyrrole.
  • the anode material capable of absorbing/releasing lithium (Li) include elemental lithium metal, metal elements and semimetal elements capable of forming alloys together with lithium (Li), alloys and compounds including such elements.
  • the alloys used herein also include alloys containing one or more metal elements and one or more semimetal elements.
  • the alloy may be in the state of a solid solution, a eutectic crystal (eutectic mixture), an intermetallic compound, and a mixture thereof.
  • Examples of the metal elements and the semimetal elements include stannum (Sn), plumbum (Pb), aluminum (Al), indium (In), silicon (Si), zinc (Zn), stibium (Sb), bismuth (Bi), cadmium (Cd), magnesium (Mg), boron (B), gallium (Ga), germanium (Ge), arsenic (As), argentum (Ag), zirconium (Zr), yttrium (Y) and hafnium (Hf).
  • Examples of the above alloys and compounds include a material having a chemical formula: MasMbtLiu and a material having a chemical formula: MapMcqMdr.
  • Ma represents at least one of metal elements and semimetal elements capable of forming an alloy together with lithium
  • Mb represents at least one of metal elements and semimetal elements other than lithium and Ma
  • Mc represents at least one of non-metal elements
  • Md represents at least one of metal elements and semimetal elements other than Ma
  • s, t, u, p, q and r meet s>0, t ⁇ 0, u ⁇ 0, p>0, q>0 and r ⁇ 0.
  • an inorganic compound not including lithium (Li), such as MnO2, V2O5, V6O13, NiS and MoS, may be used in the anode.
  • the separator in some embodiments of the present application includes, but is not limited to, at least one selected from polyethylene, polypropylene, polyethylene terephthalate, polyimide and aramid.
  • the polyethylene includes at least one component selected from high-density polyethylene, low-density polyethylene and ultra-high molecular weight polyethylene.
  • the polyethylene and the polypropylene have a good function on preventing short circuits, and can improve the stability of the battery by a turn-off effect.
  • the surface of the separator may further include a porous layer, the porous layer is disposed on at least one surface of the separator, the porous layer includes inorganic particles and a binder, and the inorganic particles are selected from one or a combination of more of aluminum oxide (Al2O3), silicon oxide (SiO2), magnesium oxide (MgO), titanium oxide (TiO2), hafnium oxide (HfO2), stannic oxide (SnO2), cerium dioxide (CeO2), nickel oxide (NiO), zinc oxide (ZnO), calcium oxide (CaO), zirconium dioxide (ZrO2), yttrium oxide (Y2O3), silicon carbide (SiC), boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide and barium sulfate.
  • Al2O3 aluminum oxide
  • SiO2O2O2O2 silicon oxide
  • MgO magnesium oxide
  • TiO2 titanium oxide
  • HfO2 hafnium oxide
  • the binder is selected from one or a combination of more of polyvinylidene fluoride, a vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate ester, polyacrylic acid, polyacrylate salt, carboxymethylcellulose sodium, polyvinylpyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene and polyhexafluoropropylene.
  • the porous layer can improve the heat resistance, oxidation resistance and electrolyte wettability of the separator, and enhance the bonding property between the separator and the cathode or anode.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Secondary Cells (AREA)
US16/960,840 2019-04-25 2020-03-17 Battery Abandoned US20210159562A1 (en)

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CN115882124A (zh) * 2020-09-28 2023-03-31 宁德新能源科技有限公司 电池
CN113328178B (zh) * 2021-05-27 2022-11-15 东莞新能德科技有限公司 一种曲面电池及电子装置
CN117795717A (zh) * 2021-10-13 2024-03-29 株式会社杰士汤浅国际 蓄电元件
CN114709572B (zh) * 2022-06-06 2022-09-02 宁德新能源科技有限公司 电极组件、电化学装置及用电设备

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EP3961743A4 (fr) 2024-01-17
EP3961743A1 (fr) 2022-03-02
JP7015915B2 (ja) 2022-02-03

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