WO2020215927A1 - 一种电池 - Google Patents

一种电池 Download PDF

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Publication number
WO2020215927A1
WO2020215927A1 PCT/CN2020/079727 CN2020079727W WO2020215927A1 WO 2020215927 A1 WO2020215927 A1 WO 2020215927A1 CN 2020079727 W CN2020079727 W CN 2020079727W WO 2020215927 A1 WO2020215927 A1 WO 2020215927A1
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WO
WIPO (PCT)
Prior art keywords
arc
shaped
shaped metal
electrode assembly
shaped electrode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2020/079727
Other languages
English (en)
French (fr)
Inventor
胡东阁
韩威风
刘彬
王涛
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ningde Amperex Technology Ltd
Original Assignee
Ningde Amperex Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ningde Amperex Technology Ltd filed Critical Ningde Amperex Technology Ltd
Priority to JP2020518534A priority Critical patent/JP7015915B2/ja
Priority to US16/960,840 priority patent/US20210159562A1/en
Priority to EP20737081.8A priority patent/EP3961743A4/en
Publication of WO2020215927A1 publication Critical patent/WO2020215927A1/zh
Anticipated expiration legal-status Critical
Priority to US18/593,227 priority patent/US20240213586A1/en
Ceased 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

  • the embodiments of the present application relate to the technical field of electrochemical devices, and more specifically, to a battery.
  • Square lithium-ion batteries are currently the most commonly used secondary lithium-ion batteries. It is often used in mobile electronic devices, such as mobile phones, tablet computers, and so on.
  • mobile electronic devices such as mobile phones, tablet computers, and so on.
  • wearable devices which requires arc-shaped batteries with a certain curvature to meet the requirements of ergonomics, further improve the space utilization of the equipment and increase the energy of the battery.
  • the existing arc-shaped batteries have problems such as high difficulty in welding the electrode assembly, easy to touch the electrode assembly during assembly, and difficulty in putting the electrode assembly of a specific shape into the arc-shaped casing. Therefore, in order to solve the above problems, it is necessary to improve the existing curved battery.
  • One of the objectives of the present application is to provide a battery which improves the structure of the arc battery in the prior art and effectively solves many problems existing in the arc battery in the prior art.
  • a battery which includes: an arc-shaped metal casing, an arc-shaped metal plate, and an arc-shaped electrode assembly.
  • the arc-shaped metal casing has an arc-shaped surface and a plurality of sidewalls extending from the arc-shaped surface ,
  • the arc-shaped electrode assembly is arranged between the arc-shaped metal shell and the arc-shaped metal plate, wherein a plurality of side walls are joined with the arc-shaped metal plate to seal the arc-shaped electrode assembly between the arc-shaped metal shell and the arc-shaped metal plate between.
  • the arc-shaped metal casing can be adapted to the internal space of the electronic device and improve the energy density of the battery.
  • the arc-shaped metal shell has an arc-shaped surface and a plurality of side walls extending from the arc-shaped surface, and the plurality of side walls are joined with the arc-shaped metal plate to seal the arc-shaped electrode assembly between the arc-shaped metal shell and the arc-shaped metal plate.
  • the plurality of side walls includes a first flange
  • the arc-shaped metal plate includes a second flange
  • the plurality of side walls are joined to the second flange of the arc-shaped metal plate through the first flange.
  • the plurality of side walls includes 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 arc-shaped sides.
  • the first side, the second side, the third side, and the fourth side are all horizontal sides.
  • the arc-shaped electrode assembly includes a groove or is formed with a step.
  • the arc-shaped electrode assembly and the arc-shaped metal shell have the same radius of curvature, and the radius of curvature is greater than 8 mm.
  • the arc-shaped electrode assembly is a winding structure, and the arc-shaped electrode assembly includes a positive pole piece, a negative pole piece, and a separator.
  • the separator is disposed between the positive pole piece and the negative pole piece;
  • a positive lug is arranged in the middle of the, and a negative lug is arranged in the middle of the negative pole piece.
  • the arc-shaped electrode assembly is a winding structure, and the arc-shaped electrode assembly includes a plurality of positive lugs and a plurality of negative lugs.
  • one of the plurality of side walls has a first electrode terminal and a second electrode terminal; the first electrode terminal is electrically connected to the positive ear, and the second electrode terminal is electrically connected to the negative ear.
  • FIG. 1 is a schematic diagram of the structure of a battery according to some embodiments of the present application.
  • Fig. 2 is a schematic diagram of an exploded structure of the battery shown in Fig. 1.
  • FIG. 3 is a schematic diagram of an exploded structure of batteries according to other embodiments of the present application.
  • Fig. 4 is a schematic structural diagram of an arc-shaped metal shell according to other embodiments of the present application.
  • FIG. 5 is a schematic diagram of the structure of arc-shaped metal plates according to other embodiments of the present application.
  • Fig. 6 is a schematic structural diagram of batteries according to other embodiments of the present application.
  • Fig. 7 is a schematic structural diagram of arc-shaped electrode assemblies according to other embodiments of the present application.
  • FIG. 8 is a schematic structural diagram of arc-shaped electrode assemblies according to other embodiments of the present application.
  • Fig. 9 is a schematic structural diagram of arc-shaped electrode assemblies according to other embodiments of the present application.
  • FIG. 10 is a schematic structural diagram of arc-shaped electrode assemblies according to other embodiments of the present application.
  • FIG. 11 is a schematic diagram of the tabs of the wound arc-shaped electrode assembly in the middle of the pole pieces according to other embodiments of the present application.
  • FIG. 12 is a schematic diagram of a multi-pole lug structure of a wound arc-shaped electrode assembly according to other embodiments of the present application.
  • relative terms such as: “arc-length direction”, “central”, “longitudinal”, “lateral”, “forward”, “ “Rear”, “right”, “left”, “internal”, “external”, “lower”, “higher”, “horizontal”, “vertical”, “high “On”, “below”, “above”, “below”, “top”, “bottom” and their derivative terms (such as “horizontally”, “downwardly”, “upwardly” Etc.) should be interpreted as referring to the directions described in the discussion or described in the drawings. These relative terms are only used for the convenience of description, and do not require the construction or operation of this application in a specific direction.
  • the term "about” is used to describe and illustrate small variations.
  • the term may refer to an example in which the event or situation occurs precisely and an example in which the event or situation occurs very closely.
  • the term may refer to a range of variation less than or equal to ⁇ 10% of the stated value, such as 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 diagram of the structure of a battery according to some embodiments of the present application.
  • Fig. 2 is a schematic diagram of an exploded structure of the battery shown in Fig. 1.
  • the battery includes an arc-shaped metal casing 10, an arc-shaped metal plate 14, and an arc-shaped electrode assembly 12 located between the arc-shaped metal casing 10 and the arc-shaped metal plate 14.
  • the arc-shaped metal casing 10 has an arc-shaped surface 101 and a plurality of side walls 102 a, 102 b, 102 c, and 102 d extending from the arc-shaped surface 100.
  • the arc-shaped surface 101 of the arc-shaped metal casing 10 and the side walls 102 a, 102 b, 102 c, and 102 d extending from the arc-shaped surface 101 jointly form an opening 103 along the thickness direction of the arc-shaped metal casing 10.
  • the thickness direction is indicated as the double arrow direction indicated by the letter A in FIG. 2.
  • the arc-shaped electrode assembly 12 and the tabs 121 and 122 at the front end of the arc-shaped electrode assembly 12 are both disposed in the opening 103.
  • the tabs 121 and 122 may be positive and negative ears, respectively.
  • the setting of the positive ear and the negative ear can be determined according to actual needs, and is not limited thereto.
  • the tab 121 can be a negative ear
  • the tab 122 can be a positive ear.
  • bonding is also adopted.
  • the arc-shaped electrode assembly 12 is fixedly arranged in the opening 103 of the arc-shaped metal casing 10.
  • the bonding method can be achieved by glue or double-sided tape, but is not limited to this.
  • An arc-shaped metal plate 14 is also covered on the arc-shaped electrode assembly 12.
  • the arc-shaped metal plate 14 is joined to the plurality of side walls 102 a, 102 b, 102 c, and 102 d of the arc-shaped metal casing 10 to seal the arc-shaped electrode assembly 12 between the arc-shaped metal casing 10 and the arc-shaped metal plate 14.
  • the arc-shaped metal plate 14 can be joined to the multiple side walls 102a, 102b, 102c, and 102d by welding (for example, laser welding), but it is not limited to this.
  • the tabs 121 and 122 and the arc-shaped electrode assembly 12 can also be joined by welding (for example, laser welding), but it is not limited thereto.
  • FIGS. 1 and 2 show an arc-shaped metal housing 10 with four side walls 102a, 102b, 102c, and 102d, as long as the side walls can match the arc-shaped surface 101 of the arc-shaped metal housing 10.
  • An opening 103 is formed, and those skilled in the art can set any number of side walls according to actual needs without limitation.
  • the structure of the arc-shaped metal plate 14 can also be changed as the structure of the arc-shaped metal casing 10 changes, thereby sealing the arc-shaped electrode assembly 12 between the arc-shaped metal casing 10 and the arc-shaped metal plate 14.
  • the plurality of side walls 102a, 102b, 102c, and 102d respectively correspond to four sides in the direction of the opening 103 of the arc-shaped metal housing 10, namely: a first side 104a and a second side 104b adjacent to the first side 104a , A third side 104c opposite to the first side 104a and a fourth side 104d opposite to the second side 104b.
  • the second side 104b and the fourth side 104d are both horizontal sides
  • the first side 104a and the third side 104c are both arc-shaped sides.
  • the first side 104a, the second side 104b, the third side 104c, and the fourth side 104d may all be horizontal sides.
  • the material of the arc-shaped metal shell 10 and the arc-shaped metal plate 14 may be steel, aluminum, or other metals or alloys. Both the arc-shaped metal shell 10 and the arc-shaped electrode assembly 12 have a certain curvature. Preferably, the radius of curvature of the arc surface of the arc-shaped metal shell 10 and the arc-shaped electrode assembly 12 may be any radius of curvature greater than 8 mm.
  • the arc-shaped 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 102a, and are electrically connected to the tabs 121 and 122 provided in the opening 103 by welding (for example, laser welding), but not limited in this way.
  • the terminals 105 and 106 may be a positive terminal and a negative terminal, respectively.
  • the specific settings of the positive terminal and the negative terminal can be determined according to the settings of the tabs 121 and 122, and are not limited thereto.
  • the terminals 105 and 106 are respectively connected to the positive and negative electrodes of the external circuit to electrically connect the arc-shaped electrode assembly 12 to the external circuit through tabs 121 and 122 electrically connected to the terminals 105 and 106, respectively.
  • the explosion-proof valve 108 is used to release the gas generated in the opening 103 of the arc-shaped metal casing 10. As shown in FIGS. 1 and 2, insulating and sealing members 109 and 110 are respectively provided around the terminals 105 and 106.
  • the function of the insulating sealing members 109 and 110 is to electrically insulate the terminals 105 and 106 from the side wall 102a of the arc-shaped metal shell 10, and to prevent external liquid from entering the arc through the gap between the side wall 102a and the terminal 105 or 106.
  • the insulating and sealing components 109 and 110 can be any insulating material, such as plastic, rubber, etc.
  • FIG. 3 is a schematic diagram of an exploded structure of batteries according to other embodiments of the present application.
  • the battery shown in FIG. 3 is substantially the same as the battery shown in FIGS. 1 to 2, and the difference lies in the positions of the tabs 121 and 122.
  • the tab 122 is still at the front end of the arc-shaped electrode assembly 12, and the tab 121 is at the back end of the arc-shaped electrode assembly 12.
  • the terminal 106 is still arranged on the side wall 102 a of the arc-shaped metal shell 10, and the terminal 105 is arranged on the side wall 102 c of the arc-shaped metal shell 10.
  • the tabs 121 and 122 can also be provided at the rear end of the arc-shaped electrode assembly 12 at the same time (not shown), and the terminal 105 can be modified according to the positions of the tabs 121 and 122.
  • And 106 are located at the side wall 102d of the arc-shaped metal shell 10.
  • FIG. 4 is a schematic structural diagram of an arc-shaped metal shell according to other embodiments of the present application.
  • FIG. 5 is a schematic diagram of the structure of arc-shaped metal plates according to other embodiments of the present application.
  • Fig. 6 is a schematic structural diagram of batteries according to other embodiments of the present application.
  • the structures of the battery, the arc-shaped metal casing 40 and the arc-shaped metal plate 44 shown in FIGS. 4 to 6 are substantially the same as those shown in FIGS. 1 to 2, except that the battery and the arc shown in FIGS. 4 to 6
  • the arc-shaped metal shell 40 and the arc-shaped metal plate 44 are respectively provided with flanges 46b and 46d on the side walls 402b and 402d of the arc-shaped metal shell 40, and flanges are respectively provided on the corresponding positions of the arc-shaped metal plate 44. 48b and 48d.
  • FIGS. 4 to 6 show an arc-shaped metal shell 40 with two flanges 46b and 46d and an arc-shaped metal plate 44 with two corresponding flanges 48b and 48d, the flange 46b , 46d, 48b and 48d are not necessary, and the specific number of flanges can also be set arbitrarily. For example, as shown in FIGS. 1 to 2, there are no flanges or the four side walls of the arc-shaped metal shell 40 and the four sides of the arc-shaped metal plate are correspondingly provided with flanges and the like.
  • the flanges 46b, 46d, 48b, and 48d of the battery shown in FIG. 6 are trimmed to obtain the battery structure shown in FIG. 1.
  • the flange of the battery shown in FIG. 6 is trimmed so that only a flange of about 0.5 mm-3 mm is left.
  • FIGS. 7 to 10 are schematic structural diagrams of arc-shaped electrode assemblies according to other embodiments of the present application.
  • the arc-shaped electrode assembly 12 shown in FIGS. 2 to 3 in this application is a complete arc surface.
  • the arc-shaped electrode assembly may also have other structural forms.
  • the arc-shaped electrode assembly may be a two-dimensional special-shaped arc-shaped electrode assembly in which a part of the area has a groove structure or an irregular protrusion structure in the direction of the arc surface.
  • FIG. 7 there is a groove structure 52 at the middle position of the arc-shaped electrode assembly 12 in the direction of the arc surface.
  • the groove structure 54 there is a groove structure 54 at the right side of the arc-shaped electrode assembly 12 in the direction of the arc.
  • the groove structure can also be located at other positions of the arc-shaped electrode assembly 12, and is not limited thereto.
  • the arc-shaped electrode assembly 12 may also be a three-dimensional special-shaped arc-shaped electrode assembly with local irregular protrusions in the thickness direction. As shown in FIGS. 9 to 10, the arc-shaped electrode assembly 12 is superimposed on a partial area of the arc surface to form a stepped structure 62/64 with steps.
  • the arc-shaped electrode assembly includes a positive pole piece containing a positive electrode material, a negative pole piece containing a negative electrode material, and a separator, wherein the separator is disposed between the positive pole piece and the negative pole piece.
  • the positive pole piece and the negative pole piece can be made of metal materials, such as copper foil or aluminum foil, but not limited to this.
  • the arc-shaped electrode assembly in this application can be manufactured by conventional methods known to those skilled in the art.
  • the arc-shaped electrode assembly is formed by sequentially winding or stacking the positive pole piece, the separator film, and the negative pole piece.
  • FIG. 11 is a schematic diagram of the tabs of the wound arc-shaped electrode assembly in the middle of the pole pieces according to other embodiments of the present application.
  • the middle of the positive pole piece 72 of the wound arc electrode assembly is provided with a positive lug 722
  • the middle of the negative pole piece 74 is provided with a negative lug 742.
  • the arrangement of the tabs can effectively reduce the impedance of the arc-shaped electrode assembly, thereby improving the ability of rapid charging and reducing temperature rise.
  • FIG. 12 is a schematic diagram of a multi-pole lug structure of a wound arc-shaped electrode assembly according to other embodiments of the present application.
  • the positive pole piece 82 and the negative pole piece 84 of the wound arc-shaped electrode assembly are respectively provided with a plurality of tabs 822 and 842.
  • the arrangement of the tabs disclosed in FIG. 12 can also reduce the impedance of the arc electrode assembly, thereby improving the ability of rapid charging and reducing Temperature rise.
  • an opening is provided in the thickness direction of the arc-shaped metal shell, so that the arc-shaped electrode assembly with a complete arc surface and the two-dimensional special-shaped arc-shaped electrode assembly and the three-dimensional arc-shaped electrode assembly shown in FIGS. 7 to 10 are all It can be easily placed horizontally into the arc-shaped metal shell, which greatly reduces the difficulty of the manufacturing process of the battery, and at the same time makes the arc-shaped electrode assembly placement position control more accurate.
  • the two-dimensional special-shaped arc electrode assembly and the three-dimensional arc electrode assembly shown in Figures 7 to 10 it can also make it better match the battery space structure, improve battery space utilization, and increase battery energy. density.
  • the positive pole piece includes a positive electrode material capable of absorbing and releasing lithium (Li) (hereinafter, sometimes referred to as "a positive electrode material capable of absorbing/releasing lithium Li").
  • a positive electrode material capable of absorbing/releasing lithium (Li) may include lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, and phosphoric acid.
  • iron lithium, lithium titanate, and lithium-rich manganese-based materials may include lithium cobalt oxide, lithium nickel cobalt manganese oxide, lithium nickel cobalt aluminate, lithium manganate, lithium iron manganese phosphate, lithium vanadium phosphate, lithium vanadyl phosphate, and phosphoric acid.
  • the chemical formula of lithium cobalt oxide can be LixCoaM1bO2-c, where M1 represents selected from nickel (Ni), manganese (Mn), magnesium (Mg), aluminum (Al), boron (B), titanium ( Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr), tungsten ( At least one of W), yttrium (Y), lanthanum (La), zirconium (Zr) and silicon (Si), and the values of x, a, b and c are in the following ranges: 0.8 ⁇ x ⁇ 1.2, 0.8 ⁇ a ⁇ 1, 0 ⁇ b ⁇ 0.2, -0.1 ⁇ c ⁇ 0.2;
  • the chemical formula of lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminate can be LiyNidM2eO2-f, where M2 represents selected from cobalt (Co), manganese (Mn), magnesium (Mg), aluminum (Al) , Boron (B), titanium (Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca) At least one of, strontium (Sr), tungsten (W), zirconium (Zr) and silicon (Si), the values of y, d, e and f are in the following ranges: 0.8 ⁇ y ⁇ 1.2, 0.3 ⁇ d ⁇ 0.98, 0.02 ⁇ e ⁇ 0.7, -0.1 ⁇ f ⁇ 0.2;
  • the chemical formula of lithium manganate is LizMn2-gM3gO4-h, where M3 represents selected from cobalt (Co), nickel (Ni), magnesium (Mg), aluminum (Al), boron (B), titanium ( Ti), vanadium (V), chromium (Cr), iron (Fe), copper (Cu), zinc (Zn), molybdenum (Mo), tin (Sn), calcium (Ca), strontium (Sr) and tungsten ( At least one of W), the values of z, g, and h are in the following ranges: 0.8 ⁇ z ⁇ 1.2, 0 ⁇ g ⁇ 1.0, and -0.2 ⁇ h ⁇ 0.2.
  • the negative pole piece includes a negative electrode material capable of absorbing and releasing lithium (Li) (hereinafter, sometimes referred to as "a negative electrode material capable of absorbing/releasing lithium Li”).
  • a negative electrode material capable of absorbing/releasing lithium (Li) may include carbon materials, metal compounds, oxides, sulfides, lithium nitrides such as LiN3, lithium metal, metals forming alloys with lithium, and polymer materials.
  • Examples of carbon materials may include low graphitization carbon, easy graphitization carbon, artificial graphite, natural graphite, mesophase carbon microspheres, soft carbon, hard carbon, pyrolysis carbon, coke, glassy carbon, sintered organic polymer compounds Body, carbon fiber 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 carbonizing a polymer material such as phenol plastic or furan resin at an appropriate temperature, and some of these materials are divided into low graphitized carbon or easily graphitized carbon .
  • Examples of polymer materials may include polyacetylene and polypyrrole.
  • the negative electrode material capable of absorbing/releasing lithium (Li) may include elemental lithium metal, metal elements and semimetal elements capable of forming alloys with lithium (Li), alloys and compounds including such elements, and the like.
  • they are used together with carbon materials, because in this case, good cycle characteristics and high energy density can be obtained.
  • the alloys used herein also include alloys containing one or more metal elements and one or more semi-metal elements. The alloy can be in the following states: solid solution, eutectic crystal (eutectic mixture), intermetallic compound and mixtures thereof.
  • metal elements and semi-metal elements may include tin (Sn), lead (Pb), aluminum (Al), indium (In), silicon (Si), zinc (Zn), antimony (Sb), bismuth (Bi), Cadmium (Cd), magnesium (Mg), boron (B), gallium (Ga), germanium (Ge), arsenic (As), silver (Ag), zirconium (Zr), yttrium (Y), and hafnium (Hf).
  • Examples of the aforementioned alloys and compounds may include materials with the chemical formula: MasMbtLiu and materials with the chemical formula: MapMcqMdr.
  • Ma represents at least one element of metal elements and semimetal elements that can form alloys with lithium
  • Mb represents at least one element of metal elements and semimetal elements other than lithium and Ma
  • Mc Represents at least one element among non-metal elements
  • Md represents at least one element among metal elements and semimetal elements other than Ma
  • s, t, u, p, q and r satisfy s>0, t ⁇ 0, u ⁇ 0, p>0, q>0, and r ⁇ 0.
  • inorganic compounds that do not include lithium (Li), such as MnO2, V2O5, V6O13, NiS, and MoS, may be used in the negative electrode.
  • the isolation film 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.
  • polyethylene includes at least one component selected from high-density polyethylene, low-density polyethylene and ultra-high molecular weight polyethylene.
  • polyethylene and polypropylene they have a good effect on preventing short circuits, and can improve the stability of the battery through the shutdown effect.
  • the surface of the isolation membrane may further include a porous layer disposed on at least one surface of the isolation membrane, the porous layer includes inorganic particles and a binder, and the inorganic particles are selected from alumina (Al2O3 ), silicon oxide (SiO2), magnesium oxide (MgO), titanium oxide (TiO2), hafnium dioxide (HfO2), tin oxide (SnO2), cerium dioxide (CeO2), nickel oxide (NiO), zinc oxide (ZnO) ), calcium oxide (CaO), zirconium oxide (ZrO2), yttrium oxide (Y2O3), silicon carbide (SiC), boehmite, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, and barium sulfate.
  • alumina Al2O3
  • silicon oxide SiO2
  • MgO magnesium oxide
  • TiO2 titanium oxide
  • HfO2 hafnium dioxide
  • tin oxide SnO2
  • CeO2
  • the binder is selected from polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polyamide, polyacrylonitrile, polyacrylate, polyacrylic acid, polyacrylate, sodium carboxymethyl cellulose, polyethylene A combination of one or more of pyrrolidone, polyvinyl ether, polymethyl methacrylate, polytetrafluoroethylene, and polyhexafluoropropylene.
  • the porous layer can improve the heat resistance, oxidation resistance, and electrolyte wettability of the isolation film, and enhance the adhesion between the isolation film and the positive pole piece or the negative pole piece.

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Abstract

本申请实施例涉及一种电池。该电池包括：弧形金属壳体、弧形金属板以及弧形电极组件。弧形金属壳体具有弧形表面以及从弧形表面延伸的多个侧壁。弧形电极组件设置于弧形金属壳体与弧形金属板之间。其中，多个侧壁与弧形金属板接合以将弧形电极组件密封在弧形金属壳体与弧形金属板之间。本申请通过设置弧形金属壳体的开口方向，大大降低了电池的制造工艺难度、使得不同结构形式的弧形电极组件在放置于弧形金属壳体中的时候更为方便顺利，同时还提高了电池的能量密度。

Description

一种电池 技术领域
本申请的实施例涉及电化学装置技术领域，更具体地，涉及一种电池。
背景技术
以下说明及实例并不由于其包含于此章节中而被认为是现有技术。
方形锂离子电池是目前最常用的二次锂离子电池。其常用于移动电子设备，诸如手机、平板电脑等。但近些年来，可穿戴设备需求越来越多，这就需要一定曲率的弧形电池来满足人体工程学特点的要求，进一步的提升设备的空间利用率，提升电池的能量。
目前，现有的弧形电池存在着电极组件焊接难度高、装配时容易触碰到电极组件以及特定形状的电极组件难以放入弧形壳体等问题。因此，为了解决上述问题，需要对现有弧形电池进行改进。
发明内容
本申请的目的之一在于提供一种电池，其对现有技术的弧形电池的结构进行了改进，有效解决了现有技术弧形电池存在的诸多问题。
本申请一些实施例提供一种电池，该电池包括：弧形金属壳体、弧形金属板以及弧形电极组件，弧形金属壳体具有弧形表面以及从弧形表面延伸的多个侧壁，弧形电极组件设置于弧形金属壳体与弧形金属板之间，其中，多个侧壁与弧形金属板接合以将弧形电极组件密封在弧形金属壳体与弧形金属板之间。
本申请通过设置弧形金属壳体，可适应电子设备内部空间，提升电池能量密度。弧形金属壳体具有弧形表面以及从弧形表面延伸的多个侧壁，多个侧壁与弧形金属板接合以将弧形电极组件密封在弧形金属壳体与弧形金属板之间，大大降低了电池的制造工艺难度、使得不同结构形式的弧形电极组件在放置于弧形金属壳体中的时候更为方便顺利，同时还提高了电池的能量 密度。
根据本申请的一些实施例，多个侧壁包括第一凸缘，弧形金属板包括第二凸缘，多个侧壁通过第一凸缘与弧形金属板的所述第二凸缘接合。
根据本申请的一些实施例，多个侧壁包括第一边、与第一边邻接的第二边、与第一边相对的第三边以及与第二边相对的第四边。
根据本申请的一些实施例，第一边和第三边为水平边，第二边和第四边为弧形边。
根据本申请的一些实施例，第一边、第二边、第三边以及第四边均为水平边。
根据本申请的一些实施例，弧形电极组件包括凹槽或形成有台阶。
根据本申请的一些实施例，弧形电极组件以及弧形金属壳体具有相同的曲率半径，且曲率半径大于8mm。
根据本申请的一些实施例，弧形电极组件是卷绕结构，弧形电极组件包括正极极片、负极极片以及隔离膜，隔离膜设置于正极极片和负极极片之间；正极极片的中部设置有正极耳，负极极片的中部设置有负极耳。
根据本申请的一些实施例，弧形电极组件是卷绕结构，弧形电极组件包括多个正极耳和多个负极耳。
根据本申请的一些实施例，多个侧壁中的一者具有第一电极端子以及第二电极端子；第一电极端子与正极耳电连接，第二电极端子与负极耳电连接。
附图说明
在下文中将简要地说明为了描述本申请实施例或现有技术所必要的附图以便于描述本申请的实施例。显而易见地，下文描述中的附图仅只是本申请中的部分实施例。对本领域技术人员而言，在不需要创造性劳动的前提下，依然可以根据这些附图中所例示的结构来获得其他实施例的附图。
图1为根据本申请一些实施例的电池的结构示意图。
图2为根据图1所示的电池的分解结构示意图。
图3为根据本申请另一些实施例的电池的分解结构示意图。
图4为根据本申请另一些实施例的弧形金属壳体的结构示意图。
图5为根据本申请另一些实施例的弧形金属板的结构示意图。
图6为根据本申请另一些实施例的电池的结构示意图。
图7为根据本申请另一些实施例的弧形电极组件的结构示意图。
图8为根据本申请另一些实施例的弧形电极组件的结构示意图。
图9为根据本申请另一些实施例的弧形电极组件的结构示意图。
图10为根据本申请另一些实施例的弧形电极组件的结构示意图。
图11为根据本申请另一些实施例的卷绕式弧形电极组件的极耳在极片中间位置的示意图。
图12为根据本申请另一些实施例的卷绕式弧形电极组件的多极耳结构示意图。
具体实施方式
本申请的实施例将会被详细的描述在下文中。在本申请说明书全文中，将相同或相似的组件以及具有相同或相似的功能的组件通过类似附图标记来表示。在此所描述的有关附图的实施例为说明性质的、图解性质的且用于提供对本申请的基本理解。本申请的实施例不应该被解释为对本申请的限制。
在本说明书中，除非经特别指定或限定之外，相对性的用词例如：“弧长方向的”、“中央的”、“纵向的”、“侧向的”、“前方的”、“后方的”、“右方的”、“左方的”、“内部的”、“外部的”、“较低的”、“较高的”、“水平的”、“垂直的”、“高于”、“低于”、“上方的”、“下方的”、“顶部的”、“底部的”以及其衍生性的用词(例如“水平地”、“向下地”、“向上地”等等)应该解释成引用在讨论中所描述或在附图中所描述的方向。这些相对性的用词仅用于描述上的方便，且并不要求将本申请以特定的方向建构或操作。
另外，有时在本文中以范围格式呈现量、比率和其它数值。应理解，此类范围格式是用于便利及简洁起见，且应灵活地理解，不仅包含明确地指定为范围限制的数值，而且包含涵盖于所述该范围内的所有个别数值或子范围，如同明确地指定每一数值及子范围一般。
如本文中所使用，术语“约”用以描述及说明小的变化。当与事件或情 形结合使用时，所述术语可指代其中事件或情形精确发生的例子以及其中事件或情形极近似地发生的例子。举例来说，当结合数值使用时，术语可指代小于或等于所述数值的±10％的变化范围，例如小于或等于±5％、小于或等于±4％、小于或等于±3％、小于或等于±2％、小于或等于±1％、小于或等于±0.5％、小于或等于±0.1％、或小于或等于±0.05％。另外，有时在本文中以范围格式呈现量、比率和其它数值。应理解，此类范围格式是用于便利及简洁起见，且应灵活地理解，不仅包含明确地指定为范围限制的数值，而且包含涵盖于所述范围内的所有个别数值或子范围，如同明确地指定每一数值及子范围一般。
图1为根据本申请一些实施例的电池的结构示意图。图2为根据图1所示的电池的分解结构示意图。
如图1和图2所示，电池包括弧形金属壳体10、弧形金属板14以及位于弧形金属壳体10以及弧形金属板14之间的弧形电极组件12。弧形金属壳体10具有一弧形表面101以及从该弧形表面100延伸的多个侧壁102a、102b、102c以及102d。弧形金属壳体10的弧形表面101以及从该弧形表面101延伸的多个侧壁102a、102b、102c以及102d共同形成一沿着弧形金属壳体10厚度方向的开口103。所述厚度方向在图2中表示为用字母A指示的双箭头方向。弧形电极组件12以及位于弧形电极组件12前端部的极耳121和122均设置于开口103中。极耳121和122可分别为正极耳和负极耳。然而，正极耳和负极耳的设定可依据实际需求而定，并不以此为限。例如，极耳121可为负极耳，而极耳122可为正极耳。为了防止位于开口103中的弧形电极组件12在跌落或者冲击等情况发生时和弧形金属壳体10产生碰撞而导致破坏弧形电极组件12，本申请一些实施例中还通过粘结的方式将弧形电极组件12固定设置于弧形金属壳体10的开口103中。所述的粘结方式可通过胶水或双面胶等实现，但并不以此为限。在弧形电极组件12的上方还覆盖有弧形金属板14。弧形金属板14与弧形金属壳体10的多个侧壁102a、102b、102c以及102d接合以将弧形电极组件12密封在弧形金属壳体10与弧形金属板14之间。具体的，可通过焊接(例如：激光焊接)的方式将弧形金属板14与多个侧壁102a、102b、102c以及102d接合，但并不以此为限。极耳121 和122以及弧形电极组件12也可通过焊接(例如：激光焊接)的方式接合，但并不以此为限。
应理解，虽然图1和图2中示出了具有4个侧壁102a、102b、102c以及102d的弧形金属壳体10，但是只要侧壁能和弧形金属壳体10的弧形表面101形成一开口103，本领域技术人员则可根据实际需要设置任意多个数量的侧壁，而不受其限制。相应的，弧形金属板14的结构也可随着弧形金属壳体10的结构变化而变化，从而将弧形电极组件12密封在弧形金属壳体10与弧形金属板14之间。
此外，多个侧壁102a、102b、102c以及102d在弧形金属壳体10的开口103方向上分别对应有4个边，即：第一边104a、与第一边104a邻接的第二边104b、与第一边104a相对的第三边104c以及与第二边104b相对的第四边104d。如图2所示，第二边104b和第四边104d均为水平边，第一边104a和第三边104c均为弧形边。然而，在本申请的另一些实施例中，第一边104a、第二边104b、第三边104c以及第四边104d也可均为水平边。
弧形金属壳体10和弧形金属板14的材料可以是钢、铝或者其它金属或合金。弧形金属壳体10和弧形电极组件12均具有一定的曲率。优选的，弧形金属壳体10和弧形电极组件12的弧面的曲率半径可为大于8mm的任一曲率半径。
另外，弧形金属壳体10还包括端子105和106以及防爆阀108。端子105和106位于侧壁102a上，其分别与设置于开口103中的极耳121和122通过焊接(例如：激光焊接)的方式电连接，但并不以此方式为限。与正极耳121和负极耳122相对应的，端子105和106可分别为正极端子和负极端子。然而，正极端子和负极端子的具体设定可依据极耳121和122的设定情况而定，并不以此为限。端子105和106分别与外部电路的正负极连接，以通过与端子105和106分别电连接的极耳121和122而将弧形电极组件12电连接到外部电路。防爆阀108用于释放弧形金属壳体10的开口103中产生的气体。如图1和2所示，端子105和106的周围还分别设置有绝缘密封部件109以及110。绝缘密封部件109以及110的作用在于：使得端子105和106分别与弧形金属壳体10的侧壁102a电绝缘，同时可防止外部液体通 过侧壁102a与端子105或106之间的缝隙进入弧形金属壳体10的开口103中。绝缘密封部件109以及110可以为任意绝缘材料，例如塑胶、橡胶等。
图3为根据本申请另一些实施例的电池的分解结构示意图。图3所示的电池与图1至图2所示的电池大致相同，区别在于极耳121和122的位置。如图3所示，极耳122仍然在弧形电极组件12的前端部，而极耳121则在弧形电极组件12的后端部。相应的，端子106仍然设置在弧形金属壳体10的侧壁102a，而端子105则设置在弧形金属壳体10的侧壁102c。
此外，根据本申请另一些实施例，极耳121和122还可同时设置在弧形电极组件12的后端部处(未示出)，同时可根据极耳121和122的位置相应修改端子105和106的位置，使其位于弧形金属壳体10的侧壁102d处。
图4为根据本申请另一些实施例的弧形金属壳体的结构示意图。图5为根据本申请另一些实施例的弧形金属板的结构示意图。图6为根据本申请另一些实施例的电池的结构示意图。
图4至图6所示的电池、弧形金属壳体40以及弧形金属板44的结构与图1至图2所示的大致相同，区别仅在于图4至图6所示的电池、弧形金属壳体40以及弧形金属板44在弧形金属壳体40的侧壁402b和402d上还分别设置有凸缘46b和46d，弧形金属板44的相应位置上还分别设置有凸缘48b和48d。弧形金属壳体40的侧壁402b和402d上的凸缘46b和46d分别与弧形金属板44上的凸缘48b和48d通过焊接(例如：激光焊接)的方式匹配接合，从而更有效地将弧形电极组件12密封在弧形金属壳体40与弧形金属板44之间。应理解，虽然图4至图6中示出了具有2个凸缘46b以及46d的弧形金属壳体40以及具有2个对应的凸缘48b以及48d的弧形金属板44，但是凸缘46b、46d、48b以及48d并不是必须的，且凸缘的具体数量也可以任意设置。例如，如图1至图2所示的不设置任何凸缘或者弧形金属壳体40的四个侧壁上以及弧形金属板的四边都对应设置凸缘等方式。
将图6所示的电池的凸缘46b、46d、48b以及48d进行切边处理，即可得到图1中所示的电池结构。优选的，为了实现充分密封弧形电极组件12的目的，将图6所示的电池的凸缘进行切边使得仅保留约0.5mm-3mm的凸缘即可。
图7至图10为根据本申请另一些实施例的弧形电极组件的结构示意图。本申请图2至图3中所示的都是具有一段完整弧面的弧形电极组件12。然而，根据本申请一些实施例，弧形电极组件也可以是其他结构形式。例如，弧形电极组件可以是有部分区域在弧面方向具有凹槽结构或具有不规则突出结构的二维异型弧形电极组件。如图7所示，弧形电极组件12在弧面方向上的中间位置处存在凹槽结构52。如图8所示，弧形电极组件12在弧面方向上的右侧位置处存在凹槽结构54。除了图7和图8所示的位置之外，凹槽结构还可以位于弧形电极组件12的其他位置处，并不以此为限。此外，弧形电极组件12还可以是在在厚度方向有局部不规则突出部分的三维异型弧形电极组件。如图9至图10所示，弧形电极组件12在弧面上部分区域叠加形成具有台阶的阶梯状结构62/64。
在本申请的一些实施例中，弧形电极组件包括含有正极材料的正极极片、含有负极材料的负极极片以及隔离膜，其中，隔离膜设置在正极极片和负极极片之间。正极极片和负极极片可以采用金属材料制成，例如：铜箔或者铝箔等，但并不以此为限。
本申请中的弧形电极组件可以用本领域技术人员知道的传统方法制造。举例来说，在本申请一些实施例中，通过将正极极片、隔离膜、负极极片按顺序卷绕或堆叠成所述弧形电极组件。
图11为根据本申请另一些实施例的卷绕式弧形电极组件的极耳在极片中间位置的示意图。如图11所示，卷绕式弧形电极组件的正极极片72的中部设置有正极耳722，负极极片74的中部设置有负极耳742。这种极耳的设置方式可以有效地降低弧形电极组件的阻抗，从而提高快速充电的能力并降低温升。
图12为根据本申请另一些实施例的卷绕式弧形电极组件的多极耳结构示意图。如图12所示，卷绕式弧形电极组件的正极极片82和负极极片84上分别设置有多个极耳822和842。具体的，在卷绕每一圈正极极片82时保留多个极耳822中的一片极耳822，在卷绕每一圈负极极片84时保留多个极耳842中的一片极耳842。与图11所揭示的卷绕式弧形电极组件的结构的作用类似，图12中所揭示的这种极耳的设置方式同样可降低弧形电极组件的 阻抗，从而提高快速充电的能力并降低温升。
本申请通过在弧形金属壳体的厚度方向上设置开口，使得具有完整弧面的弧形电极组件以及诸如图7至图10所示的二维异型弧形电极组件以及三维弧形电极组件都可以很容易地水平放置进弧形金属壳体，大大降低了电池的制造工艺难度，同时也使得弧形电极组件放置位置控制更加精确。对于诸如图7至图10所示的二维异型弧形电极组件以及三维弧形电极组件来说，还可以使得其可以更好的和电池空间结构匹配，提升电池空间利用率，同时提升电池能量密度。
此外，在上述弧形电极组件中，正极极片包括能够吸收和释放锂(Li)的正极材料(下文中，有时称为“能够吸收/释放锂Li的正极材料”)。能够吸收/释放锂(Li)的正极材料的实例可以包括钴酸锂、镍钴锰酸锂、镍钴铝酸锂、锰酸锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、磷酸铁锂、钛酸锂和富锂锰基材料中的一种或多种。
在上述正极材料中，钴酸锂的化学式可以为LixCoaM1bO2-c，其中，M1表示选自镍(Ni)、锰(Mn)、镁(Mg)、铝(Al)、硼(B)、钛(Ti)、钒(V)、铬(Cr)、铁(Fe)、铜(Cu)、锌(Zn)、钼(Mo)、锡(Sn)、钙(Ca)、锶(Sr)、钨(W)、钇(Y)、镧(La)、锆(Zr)和硅(Si)中的至少一种，x、a、b和c值分别在以下范围内：0.8≤x≤1.2、0.8≤a≤1、0≤b≤0.2、-0.1≤c≤0.2；
在上述正极材料中，镍钴锰酸锂或镍钴铝酸锂的化学式可以为LiyNidM2eO2-f，其中，M2表示选自钴(Co)、锰(Mn)、镁(Mg)、铝(Al)、硼(B)、钛(Ti)、钒(V)、铬(Cr)、铁(Fe)、铜(Cu)、锌(Zn)、钼(Mo)、锡(Sn)、钙(Ca)、锶(Sr)、钨(W)、锆(Zr)和硅(Si)中的至少一种，y、d、e和f值分别在以下范围内：0.8≤y≤1.2、0.3≤d≤0.98、0.02≤e≤0.7、-0.1≤f≤0.2；
在上述正极材料中，锰酸锂的化学式为LizMn2-gM3gO4-h，其中M3表示选自钴(Co)、镍(Ni)、镁(Mg)、铝(Al)、硼(B)、钛(Ti)、钒(V)、铬(Cr)、铁(Fe)、铜(Cu)、锌(Zn)、钼(Mo)、锡(Sn)、钙(Ca)、锶(Sr)和钨(W)中的至少一种，z、g和h值分别在以下范围 内：0.8≤z≤1.2、0≤g＜1.0和-0.2≤h≤0.2。
负极极片包括能够吸收和释放锂(Li)的负极材料(下文中，有时称为“能够吸收/释放锂Li的负极材料”)。能够吸收/释放锂(Li)的负极材料的例子可以包括碳材料、金属化合物、氧化物、硫化物、锂的氮化物例如LiN3、锂金属、与锂一起形成合金的金属和聚合物材料。
碳材料的例子可以包括低石墨化的碳、易石墨化的碳、人造石墨、天然石墨、中间相碳微球、软碳、硬碳、热解碳、焦炭、玻璃碳、有机聚合物化合物烧结体、碳纤维和活性碳。其中，焦炭可以包括沥青焦炭、针状焦炭和石油焦炭。有机聚合物化合物烧结体指的是通过在适当的温度下煅烧聚合物材料例如苯酚塑料或者呋喃树脂以使之碳化获得的材料，将这些材料中的一些分成低石墨化碳或者易石墨化的碳。聚合物材料的例子可以包括聚乙炔和聚吡咯。
此外，能够吸收/释放锂(Li)的负极材料可以包括单质锂金属、能够和锂(Li)一起形成合金的金属元素和半金属元素，包括这样的元素的合金和化合物等等。例如，将它们和碳材料一起使用，因为在这种情况中，可以获得良好的循环特性以及高能量密度。除了包括两种或者多种金属元素的合金之外，这里使用的合金还包括包含一种或者多种金属元素和一种或者多种半金属元素的合金。该合金可以处于以下状态固溶体、共晶晶体(共晶混合物)、金属间化合物及其混合物。
金属元素和半金属元素的例子可以包括锡(Sn)、铅(Pb)、铝(Al)、铟(In)、硅(Si)、锌(Zn)、锑(Sb)、铋(Bi)、镉(Cd)、镁(Mg)、硼(B)、镓(Ga)、锗(Ge)、砷(As)、银(Ag)、锆(Zr)、钇(Y)和铪(Hf)。上述合金和化合物的例子可以包括具有化学式：MasMbtLiu的材料和具有化学式：MapMcqMdr的材料。在这些化学式中，Ma表示能够与锂一起形成合金的金属元素和半金属元素中的至少一种元素；Mb表示除锂和Ma之外的金属元素和半金属元素中的至少一种元素；Mc表示非金属元素中的至少一种元素；Md表示除Ma之外的金属元素和半金属元素中的至少一种元素；并且s、t、u、p、q和r满足s＞0、t≥0、u≥0、p＞0、q＞0和r≥0。
此外，可以在负极中使用不包括锂(Li)的无机化合物，例如MnO2、V2O5、V6O13、NiS和MoS。
本申请一些实施例中的隔离膜包括，但不限于，选自聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚酰亚胺和芳纶中的至少一种。举例来说，聚乙烯包括选自高密度聚乙烯、低密度聚乙烯和超高分子量聚乙烯中的至少一种组分。尤其是聚乙烯和聚丙烯，它们对防止短路具有良好的作用，并可以通过关断效应改善电池的稳定性。
所述隔离膜的表面还可包括多孔层，所述多孔层设置在所述隔离膜的至少一个表面上，所述多孔层包括无机颗粒和粘结剂，所述无机颗粒选自氧化铝(Al2O3)、氧化硅(SiO2)、氧化镁(MgO)、氧化钛(TiO2)、二氧化铪(HfO2)、氧化锡(SnO2)、二氧化铈(CeO2)、氧化镍(NiO)、氧化锌(ZnO)、氧化钙(CaO)、氧化锆(ZrO2)、氧化钇(Y2O3)、碳化硅(SiC)、勃姆石、氢氧化铝、氢氧化镁、氢氧化钙和硫酸钡中的一种或多种的组合。所述粘结剂选自聚偏氟乙烯、偏氟乙烯-六氟丙烯的共聚物、聚酰胺、聚丙烯腈、聚丙烯酸酯、聚丙烯酸、聚丙烯酸盐、羧甲基纤维素钠、聚乙烯呲咯烷酮、聚乙烯醚、聚甲基丙烯酸甲酯、聚四氟乙烯和聚六氟丙烯中的一种或多种的组合。
所述多孔层可以提升所述隔离膜的耐热性能、抗氧化性能和电解液浸润性能，增强所述隔离膜与正极极片或负极极片之间的粘接性。
上文说明摘要整理出数个实施例的特征，这使得所属技术领域中具有通常知识者能够更加理解本申请的多种方面。所属技术领域中具有通常知识者可轻易地使用本申请作为基础，以设计或修改其他组合物，以便实现与此处实用新型的实施例相同的目的及/或达到相同的优点。所属技术领域中具有通常知识者亦可理解，这些均等的实例并未悖离本申请的精神与范畴，且其可对本申请进行各种改变、替换与修改，而不会悖离本申请的精神与范畴。虽然本文中所揭示的方法已参考以具体次序执行的具体操作加以描述，但应理解，可在不脱离本申请的教示的情况下组合、细分或重新排序这些操作以形成等效方法。因此，除非本文中特别指示，否则操作的次序及分组不是对本申请的限制。

Claims (10)

  1. 一种电池，其特征在于，包括：
    弧形金属壳体，具有弧形表面以及从所述弧形表面延伸的多个侧壁；
    弧形金属板；以及
    弧形电极组件，设置于所述弧形金属壳体与所述弧形金属板之间；
    其中，所述多个侧壁与所述弧形金属板接合以将所述弧形电极组件密封在所述弧形金属壳体与所述弧形金属板之间。
  2. 根据权利要求1所述的电池，其特征在于，所述多个侧壁包括第一凸缘，所述弧形金属板包括第二凸缘，所述多个侧壁通过所述第一凸缘与所述第二凸缘接合。
  3. 根据权利要求1所述的电池，其特征在于，所述多个侧壁包括第一边、与所述第一边邻接的第二边、与所述第一边相对的第三边以及与所述第二边相对的第四边。
  4. 根据权利要求3所述的电池，其特征在于，所述第一边和所述第三边为水平边，所述第二边和所述第四边为弧形边。
  5. 根据权利要求3所述的电池，其特征在于，所述第一边、所述第二边、所述第三边以及所述第四边均为水平边。
  6. 根据权利要求1所述的电池，其特征在于，所述弧形电极组件包括凹槽或形成有台阶。
  7. 根据权利要求1所述的电池，其特征在于，所述弧形电极组件以及所述弧形金属壳体具有相同的曲率半径，且所述曲率半径大于8mm。
  8. 根据权利要求1所述的电池，其特征在于，所述弧形电极组件是卷绕结构，所述弧形电极组件包括正极极片、负极极片以及隔离膜，所述隔离膜设置于所述正极极片和所述负极极片之间；所述正极极片的中部设置有正极耳，所述负极极片的中部设置有负极耳。
  9. 根据权利要求1所述的电池，其特征在于，所述弧形电极组件是卷绕结构，所述弧形电极组件包括多个正极耳和多个负极耳。
  10. 根据权利要求8或9所述的电池，其特征在于，所述多个侧壁中的一者具有第一电极端子以及第二电极端子；所述第一电极端子与所述正极耳电连接，所述第二电极端子与所述负极耳电连接。
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114709572A (zh) * 2022-06-06 2022-07-05 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

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN209822691U (zh) * 2019-04-25 2019-12-20 宁德新能源科技有限公司 一种电池
USD980210S1 (en) * 2020-05-11 2023-03-07 Dell Products L.P. Display
KR20230031974A (ko) * 2020-09-28 2023-03-07 닝더 엠프렉스 테크놀로지 리미티드 배터리
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
CN113140779B (zh) * 2021-05-31 2025-03-21 惠州市恒泰科技股份有限公司 具有定形结构的弧形电芯及弧形锂电池
CN113384005B (zh) * 2021-06-01 2024-10-29 深圳麦克韦尔科技有限公司 一种电池组件以及电子雾化装置
CN117795717A (zh) * 2021-10-13 2024-03-29 株式会社杰士汤浅国际 蓄电元件
CN115101868A (zh) * 2022-02-28 2022-09-23 苏州中科瑞龙科技有限公司 一种电池壳体、电池及电池装配方法
CN117154350A (zh) * 2022-05-24 2023-12-01 蔚来汽车科技(安徽)有限公司 电芯单元、电池组、电池及用电装置
CN115117521A (zh) * 2022-06-23 2022-09-27 宁德新能源科技有限公司 壳体、弧形电池及用电设备
CN115863874A (zh) * 2022-12-08 2023-03-28 新余赣锋电子有限公司 一种用于vr眼镜的弧形电池及其制作方法
DE102024000319A1 (de) 2024-02-01 2025-08-07 Mercedes-Benz Group AG Zellgehäuse für eine Batterieeinzelzelle und Batteriemodul

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102593406A (zh) * 2011-01-14 2012-07-18 三星Sdi株式会社 二次电池和制造该二次电池的方法
WO2015057643A1 (en) * 2013-10-14 2015-04-23 24M Technologies, Inc. Curved battery container
CN105047980A (zh) * 2014-04-16 2015-11-11 三星Sdi株式会社 弯曲二次电池
CN209822691U (zh) * 2019-04-25 2019-12-20 宁德新能源科技有限公司 一种电池

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2190229C (en) * 1995-11-15 2005-02-01 Atsuo Omaru Nonaqueous-electrolyte secondary battery
US5958088A (en) 1998-03-04 1999-09-28 Duracell, Inc. Prismatic cell construction
JP3611765B2 (ja) 1999-12-09 2005-01-19 シャープ株式会社 二次電池及びそれを用いた電子機器
WO2001082393A2 (en) 2000-04-25 2001-11-01 Polystor Corporation Custom geometry battery cells and methods and tools for their manufacture
KR100833808B1 (ko) * 2000-11-21 2008-05-30 소니 가부시끼 가이샤 폴리머 전해질 전지 및 그 제조 방법
WO2002054526A1 (en) * 2000-12-27 2002-07-11 Mitsubishi Chemical Corporation Lithium secondary cell
JP4377570B2 (ja) 2001-07-19 2009-12-02 グレイトバッチ リミテッド 電気化学的電池のための外郭を有するケーシング
JP4296522B2 (ja) * 2007-08-23 2009-07-15 トヨタ自動車株式会社 電池およびその製造方法
KR101101079B1 (ko) * 2010-04-05 2011-12-30 삼성에스디아이 주식회사 이차전지
KR20130113301A (ko) * 2012-04-05 2013-10-15 주식회사 엘지화학 계단 구조의 전지셀
EP2988362B1 (en) * 2013-07-31 2020-04-01 LG Chem, Ltd. Curved electrode stack and battery pack comprising same
JP3187576U (ja) 2013-09-23 2013-12-05 迪吉亞科技股▲ふん▼有限公司 多極端子を備えた単巻芯及び該単巻を備えたリチウム電池
KR101688580B1 (ko) * 2013-09-30 2016-12-21 주식회사 엘지화학 곡면이 형성되어 있는 전지셀
KR20150049261A (ko) * 2013-10-29 2015-05-08 삼성에스디아이 주식회사 이차 전지 및 이차 전지의 제조방법
US20150140449A1 (en) * 2013-11-15 2015-05-21 Semiconductor Energy Laboratory Co., Ltd. Compound, nonaqueous electrolyte, and power storage device
KR102198002B1 (ko) * 2014-01-24 2021-01-04 삼성에스디아이 주식회사 전극 조립체 및 이를 구비하는 이차 전지
KR102198004B1 (ko) * 2014-02-12 2021-01-04 삼성에스디아이 주식회사 이차 전지
JP6103135B2 (ja) * 2014-03-31 2017-03-29 日本電気株式会社 蓄電池装置
PL3349285T3 (pl) 2016-03-31 2024-07-22 Lg Energy Solution, Ltd. Zespół elektrodowy o wysokiej elastyczności i zawierające go ogniwo akumulatorowe
US11626647B2 (en) * 2017-08-29 2023-04-11 Gs Yuasa International Ltd. Energy storage device and energy storage apparatus comprising a gas release valve having a plurality of branch points
US10658632B1 (en) * 2017-09-25 2020-05-19 Apple Inc. Battery housings for accommodating swelling of electrode assemblies
JP6987983B2 (ja) * 2017-11-07 2022-01-05 寧徳新能源科技有限公司Ningde Amperex Technology Limited 捲回型電池セル

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102593406A (zh) * 2011-01-14 2012-07-18 三星Sdi株式会社 二次电池和制造该二次电池的方法
WO2015057643A1 (en) * 2013-10-14 2015-04-23 24M Technologies, Inc. Curved battery container
CN105047980A (zh) * 2014-04-16 2015-11-11 三星Sdi株式会社 弯曲二次电池
CN209822691U (zh) * 2019-04-25 2019-12-20 宁德新能源科技有限公司 一种电池

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3961743A4 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114709572A (zh) * 2022-06-06 2022-07-05 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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