WO2023071835A1 - 一种电芯、电池及电子设备 - Google Patents

一种电芯、电池及电子设备 Download PDF

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Publication number
WO2023071835A1
WO2023071835A1 PCT/CN2022/125482 CN2022125482W WO2023071835A1 WO 2023071835 A1 WO2023071835 A1 WO 2023071835A1 CN 2022125482 W CN2022125482 W CN 2022125482W WO 2023071835 A1 WO2023071835 A1 WO 2023071835A1
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WO
WIPO (PCT)
Prior art keywords
main body
battery
tab
insulating member
electric core
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/CN2022/125482
Other languages
English (en)
French (fr)
Inventor
胡红伟
袁秀兰
田姣
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 EP22885713.2A priority Critical patent/EP4395045A4/en
Publication of WO2023071835A1 publication Critical patent/WO2023071835A1/zh
Priority to US18/651,842 priority patent/US12592458B2/en
Anticipated expiration legal-status Critical
Priority to US18/912,866 priority patent/US12548861B2/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
    • 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
    • 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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—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
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—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
    • H01M50/593—Spacers; Insulating plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • 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 batteries, and in particular, to a battery cell, a battery, and an electronic device.
  • the wound battery ends at the side of the main body of the battery, and a connector is attached to the tail of the outermost pole piece of the battery, and an insulating piece is also provided at the connection between the tab and the main body of the battery.
  • the inventors of the embodiments of the present application found that: when the edge distance of the tab on the end side of the main body of the battery core is small, the insulating tape on the tab will be completely attached to the connector, affecting The bonding force of the insulating part affects the stability of the battery core. In addition, since the insulating part is completely attached to the connecting part, the thickness of the battery cell is increased, which affects the energy density of the battery cell.
  • the embodiments of the present application provide a battery cell, a battery and an electronic device, so as to improve the stability and energy density of the battery.
  • the embodiment of the present application solves its technical problems and provides the following technical solutions: provide a battery cell, including a battery cell body and at least two tabs provided on the battery cell body, and the battery cell body consists of a first pole piece and a second pole piece
  • the electrode assembly formed by stacking sheets is wound, wherein the tail end of the electrode assembly is a free end, a separator is provided between the first pole piece and the second pole piece, and the battery core also includes A first connecting piece and at least two insulating pieces, the first connecting piece is arranged along the length direction of the battery core body, and is used to fix the tail end of the electrode assembly to the outer surface of the battery core body, so that
  • the at least two tabs include a first tab and a second tab with opposite polarities
  • the at least two insulators include a first insulator and a second insulator
  • the first end of the first insulator is set at the The main body of the battery core, the second end of the first insulating member covers part of the first tab, the
  • the first insulating member is arranged close to the first connecting member, and at least part of the first insulating member is located outside the first connecting member.
  • the first insulating member is not completely attached to the first connecting member, so as to prevent the first insulating member from lifting when the battery core is top-sealed, which affects the stability of the battery core.
  • the overlapping area between the first insulating part and the first connecting part is reduced, and the energy density of the battery cell is improved.
  • an adhesive layer is provided on the surface of the first connector that is in contact with the battery core body.
  • adhesive layers are provided on both the front and back sides of the first connector. Therefore, the bonding force of the insulator can be increased, and the stability of the electric core can be improved.
  • the first insulating part partially overlaps the first connecting part.
  • the width of the first connecting part is reduced, preventing the first insulating part from being completely attached to the first connecting part, and increasing the bonding of the first insulating part force, improving the stability of the cell.
  • the first insulating part there is a gap between the first insulating part and the first connecting part.
  • the first insulating part is completely placed outside the first connecting part, so that the first insulating part can be completely avoided from warping.
  • the first connecting member is provided with a notch, and the part of the first insulating member provided on the battery core body is placed in the notch.
  • the battery core further includes a third tab, the polarity of the third tab is the same as that of the first tab, and the at least two insulators also include a third insulation
  • the first end of the third insulating member is arranged on the main body of the electric core, the second end of the third insulating member covers part of the third tab, and along the width direction of the main body of the electric core, the The second tab is disposed between the first tab and the third tab.
  • the first insulator, the second insulator and the third insulator are integrally formed. Increase the bonding force of the insulating part and improve the stability of the battery core.
  • the outer surface of the battery core body includes a first plane, a second plane, a first arc surface and a second arc surface, and along the thickness direction of the battery core body, the first plane and the The second plane is opposite to each other, along the width direction of the main body of the cell, the first arc surface and the second arc surface are opposite to each other, and the first arc surface and the second arc surface are connected to between the first plane and the second plane.
  • the tail end of the electrode assembly is located on the first arc surface, and the first connecting member extends on the first plane through the first arc surface and on the second plane.
  • the tail end of the electrode assembly is the first pole piece or the diaphragm, and along the length direction of the cell main body, the first connecting piece completely covers the second pole piece. Therefore, the first connecting member and the separator together protect the second pole piece, preventing the burr of the second pole piece from affecting the battery cell.
  • the tail end of the electrode assembly is located on the first plane, and the first connecting member extends on the first plane to the second plane via the first arc surface.
  • the tail end of the electrode assembly is the first pole piece, and an empty foil area is provided at the tail end of the first pole piece, or, the tail end of the electrode assembly is a diaphragm.
  • the first connecting piece covers part of the first plane, and there is a gap between the first connecting piece and any one of the insulating pieces. Therefore, the overlap between the first connecting part and the insulating part is avoided, the bonding force of the insulating part is increased, and the stability and energy density of the electric core are improved.
  • the distance d1 between the edge of the cell body and the first insulating member is greater than or equal to zero.
  • the width d2 of each insulating member is in the range of: 7mm ⁇ d2 ⁇ 15mm.
  • the width d3 of the overlapping area between the first connecting member and the first insulating member is in a range of 2mm ⁇ d3 ⁇ 8mm.
  • the width d4 of the first insulating member disposed outside the first connecting member is in the range of: d4 ⁇ 3mm.
  • An embodiment of the present application also provides a battery, including the above-mentioned battery cell.
  • An embodiment of the present application further provides an electronic device, including the above-mentioned battery, where the battery is used to provide electric energy.
  • a battery cell, a battery and an electronic device provide at least part of the insulating part close to the first connecting part among the at least two insulating parts outside the first connecting part, avoiding insulation
  • the part is completely attached to the first connecting part, which increases the bonding force of the insulating part and improves the stability and energy density of the electric core.
  • Fig. 1 is a schematic structural diagram of a cell provided by one embodiment of the present application.
  • Fig. 2 is a schematic plan view of an embodiment of the cell shown in Fig. 1;
  • Fig. 3 is a cross-sectional view of the first tab along the thickness direction of the main body of the cell in the cell shown in Fig. 1;
  • Fig. 4 is a schematic plan view of a cell in the prior art
  • Fig. 5 is a schematic plan view of an embodiment of the cell shown in Fig. 1;
  • Fig. 6 is a schematic plan view of an embodiment of the cell shown in Fig. 1;
  • Fig. 7 is a schematic plan view of an embodiment of the cell shown in Fig. 1;
  • Fig. 8 is a schematic plan view of an embodiment of the cell shown in Fig. 1;
  • Fig. 9 is a schematic plan view of an embodiment of the cell shown in Fig. 1;
  • Fig. 10 is a schematic plan view of an embodiment of the cell shown in Fig. 1 .
  • Fig. 1 is a schematic structural diagram of a cell 1 provided by the embodiment of the present application.
  • Fig. 2 is a schematic plan view of the cell 1 on the surface of a shallow pit and a deep pit.
  • the core main body 100 and at least two tabs provided on the main body of the electric core, the main body of the electric core is wound by an electrode assembly formed by stacking the first pole piece 10 and the second pole piece 20, the first pole piece 10 and the polarity of the second pole piece 20 are opposite.
  • the tail end of the electrode assembly is a free end, and a diaphragm 30 is provided between the first pole piece 10 and the second pole piece 20 .
  • the head end of the electrode assembly is wound around a winding needle until it is wound to the tail end of the electrode assembly, and after the winding process is completed, the winding needle is taken out from the battery core body.
  • the electric core 1 also includes a first connecting piece 40 and at least two insulating pieces 50, the first connecting piece 40 is arranged along the length direction of the main body of the electric core, and is used for connecting the tail of the electrode assembly
  • the end is fixed on the outer surface of the main body of the electric core, and the at least two insulators 50 are arranged on the main body of the electric core and cover the at least two tabs, wherein, along the width direction of the main body of the electric core, the at least At least part of the insulating part 50 close to the first connecting part 40 among the two insulating parts is located outside the first connecting part 40 .
  • the tail end of the electrode assembly refers to the tail end after the first pole piece 10, the separator 30 and the second pole piece 20 are wound around the above-mentioned winding needle, that is, after the winding is completed,
  • the tail end located at the outermost circle of the battery core body is fixed to the outer surface of the battery core body through the first connecting piece 40 .
  • the first pole piece 10 includes a first current collector 11 and a first active material layer 12, the first active material layer 12 is disposed on the surface of the first current collector 11, and the second pole piece 20 includes a second A current collector 21 and a second active material layer 22 , the second active material layer 22 is disposed on the surface of the second current collector 21 .
  • the first pole piece 10 is a cathode piece
  • the first current collector 11 may be an aluminum foil layer
  • the first active material layer 12 is a cathode active material layer, which may be LiCoO2 , LiFeP04 and other electrochemically active materials that can deintercalate lithium ions.
  • the second pole piece 20 is an anode piece
  • the second current collector 21 may be a copper foil layer
  • the second active material layer 22 may be graphite, soft carbon, hard carbon, Li4Ti5012, etc., which can embed lithium ions electrochemically active substances.
  • the ending end of the outermost ring of the cell main body may be a first pole piece, a second pole piece or a diaphragm.
  • the tail end 13 of the first pole piece 10 is the structure of the outermost pole piece of the main body of the cell, and the first active material layer 12 on the tail end 13 of the first pole piece 10 Covering the surface of the first current collector 11 facing the second pole piece 20, the first current collector 11 on the tail end 13 of the first pole piece 10 is away from one side of the second pole piece 20 The side surfaces are not coated with the first active material layer 12 .
  • the outer surface of the battery core body includes a first plane 101, a second plane 102, a first arc surface 103, and a second arc surface 104.
  • the first A plane 101 is arranged opposite to the second plane 102, along the width direction of the battery core body, the first arc surface 103 and the second arc surface 104 are opposite to each other, and the first arc surface 103
  • the second arc surface 104 is connected between the first plane 101 and the second plane 102 .
  • the first plane 101 is a shallow pit surface
  • the second plane 102 is a deep pit surface
  • the at least two tabs include at least one first tab 60 and at least one second tab 70, the first tab 60 is connected to the first pole piece 10, and the second tab 70 is connected to the second tab 70.
  • the projections of the first tab 60 and the second tab 70 along the thickness direction of the cell body do not overlap.
  • first tab 60 and the second tab 70 protrude from the same end of the cell body. In other embodiments, the first tab 60 and the second tab 70 may protrude from different ends of the cell main body, and the present application is not limited thereto.
  • the electric core includes three tabs as an example.
  • the electric core 1 includes two first tabs 60, one second tab 70, the first tab 60 and the The second tabs 70 are arranged alternately, for example, three tabs are arranged in the manner of the first tab 60 , the second tab 70 , and the first tab 60 along the width direction of the cell body.
  • the two first tabs are respectively the first tab 60a and the first tab 60b.
  • the number of the insulators 50 is in one-to-one correspondence with the number of the tabs, that is, the number of the insulators 50 is also three, and one end of each of the insulators is arranged on the electric pole.
  • the core body, the other end of each insulator covers a corresponding tab.
  • the at least two insulators include a first insulator 51 , a second insulator 52 and a third insulator 53 .
  • the insulating member close to the first connecting member 40 is referred to as the first insulating member 51
  • the tab near the first connecting member 40 is referred to as the first tab 60a, that is, the first insulating member
  • the first end of the first insulating member 51 is arranged on the main body of the electric core
  • the second end of the first insulating member 51 covers part of the first tab 60a
  • the first end of the second insulating member 52 is arranged on the electric core body.
  • the core body, the second end of the second insulator 52 covers part of the second tab 70, the first end of the third insulator 53 is arranged on the core body, and the third insulator 53 The second end of the cover partially covers the first tab 60b.
  • the first insulating member 51 is located outside the first connecting member 40 .
  • an identification code is usually set on the first plane.
  • the tail end of the electrode assembly is usually located at the side of the main body of the battery core.
  • the second A connector extends from the first plane 101 of the cell body to the second plane 102 of the cell body, as shown in FIG.
  • the insulating part on the tab will be completely attached to the first connecting part, resulting in insufficient adhesion of the insulating part (usually the first connecting part is single-sided adhesive, that is, the first connecting part The side that is in contact with the first pole piece and/or the second pole piece is provided with an adhesive layer), and the insulating part is prone to warping when the cell is top-sealed, and the insulating part is completely attached to the first connection
  • the first connecting part is single-sided adhesive, that is, the first connecting part
  • the first connecting part is single-sided adhesive, that is, the first connecting part
  • the side that is in contact with the first pole piece and/or the second pole piece is provided with an adhesive layer
  • the present application makes at least part of the first insulating member 51 outside the first connecting member 40, so as to prevent the insulating member from being completely attached to the first connecting member, thereby improving the stability of the electric core. and energy density.
  • the side portion of the cell main body refers to the part close to the edge in the length direction of the cell main body when viewed along the thickness direction of the cell main body, that is, the outer surface of the cell main body
  • the first arc surface 103 or the second arc surface 104 refers to the part close to the edge in the length direction of the cell main body when viewed along the thickness direction of the cell main body, that is, the outer surface of the cell main body The first arc surface 103 or the second arc surface 104.
  • tail end of the electrode assembly may be located at the side of the cell body, or at the first plane or the second plane of the cell body.
  • the tail end of the electrode assembly is located on the side of the battery core body, and the tail end of the single-sided cathode sheet (the side of the cathode sheet facing the anode sheet on the tail end is coated with a cathode active material , the side away from the anode sheet is not coated with cathode active material) is located at the outermost circle of the cell body, along the length direction of the cell body, the first connector 40 completely covers the second pole piece. That is, along the length direction of the main body of the battery cell, the first connecting member needs to exceed the second pole piece, so as to avoid damage caused by burrs on the second pole piece.
  • the tail end of the electrode assembly is located on the first plane or the second plane of the battery core body, there is no requirement, only the first connector needs to be along the length direction of the battery core body, and the covering part The first plane or the second plane can be used.
  • the tail end of the electrode assembly is located at the side of the battery core body, and the first insulating member 51 partially overlaps the first connecting member 40, as shown in FIG. 2 , specifically, Along the width direction of the cell main body, a part of the first insulating member 51 is arranged on the first connecting member 40, and another part of the first insulating member 51 is arranged on the first plane and/or the second plane. flat.
  • the electric core further includes a second connector 80, the second connector 80 is arranged on the first plane and spaced apart from the first connector 40, and the identification code is arranged on the first connector 40. Two connectors 80 .
  • the distance d1 between the first insulating member and the edge of the cell body is greater than or equal to zero.
  • the width d2 of the first insulating member is in a range of: 7mm ⁇ d2 ⁇ 15mm.
  • the widths of the second insulating member 52 and the third insulating member 53 also need to meet the above conditions.
  • the width d3 of the first tab 60a on the first connector is in a range of: 2mm ⁇ d3 ⁇ 8mm.
  • the width d4 of the first insulating member 51 disposed on the outer portion of the first connecting member 40 is greater than or equal to 3 mm, that is, the first insulating member 51
  • the range of the width d4 of the non-overlapping area with the first connecting member 40 is: d4 ⁇ 3mm.
  • the height of the insulating member disposed on the main body of the battery core is greater than or equal to 3 mm.
  • the at least two insulators 50 are integrally formed, that is, the first insulator 51, the second insulator 52 and the third insulator 53 are integrally formed, as shown in FIG. 5 .
  • the first insulating member 51 is completely attached to the first connecting member 40, the first insulating member is easy to warp during the top sealing process of the electric core 1, causing the electric core 1 to be out of order. Stablize.
  • the first connecting part does not need to be narrowed, and the identification code can be engraved on the first connecting part 40 without adding the second connecting part 80 separately.
  • the first insulating member 51 is completely placed outside the first connecting member 40 .
  • the first connecting member 40 is provided with a gap 41, and the first connecting member 40 is provided with a gap 41.
  • a portion of an insulating member 51 disposed on the main body of the cell is placed in the notch 41 .
  • the size of the gap needs to meet:
  • the first connector 40 can completely cover the anode sheet, so that the first connector and the separator together protect the anode sheet and prevent the burrs of the anode sheet from causing damage to the battery cell. .
  • adhesive layers are provided on both sides of the first connecting member 40, as shown in FIG. An insulating member 51 can be completely attached to the first connecting member 40 without worrying that the first insulating member 51 will be lifted when the battery core 1 is top-sealed.
  • the first insulating member 51, the second insulating member 52 and the third insulating member 53 can be formed separately, As shown in Figure 7.
  • the first insulator 51 , the second insulator 52 and the third insulator 53 can also be integrally formed, as shown in FIG. 9 .
  • the notch 41 may also be provided on the first connecting member 40 , as shown in FIG. 8 .
  • the identification code can be set on the first connector or the second connector as appropriate.
  • the outermost circle of the main body of the battery cell is the first pole piece, and the tail end 13 of the first pole piece includes an empty foil area that is not coated with the first active material layer 12 on both sides,
  • the tail end 13 of the first pole piece (the tail end of the electrode assembly) is arranged on the first plane 101 or the second plane 102 of the cell main body, as shown in FIG. 10 .
  • the first connecting member 40 along the length of the main body of the electric core, it is enough for the first connecting member 40 to cover part of the first plane or the second plane, as long as it is ensured that along the length of the main body of the electric core, the It is enough that there is a gap between the first connecting piece and any insulating piece.
  • the identification code can be engraved on the first connecting member 40 .
  • the outermost ring of the main body of the battery cell is the diaphragm 30 , which will not be repeated in this application.
  • the embodiment of the present application also provides a battery, including the above-mentioned battery cell 1 .
  • An embodiment of the present application further provides an electronic device, including the above-mentioned battery.
  • the above-mentioned electronic devices may be electric vehicles, sweeping robots, mobile phones or tablets, etc.
  • an electric cell, a battery and an electronic device provided in the embodiments of the present application are located outside the first connecting member through at least part of the insulating member close to the first connecting member among the at least two insulating members.
  • the insulating part is prevented from being completely attached to the first connecting part, the adhesive force of the insulating part is increased, and the stability and energy density of the electric core are improved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
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Abstract

本申请实施例涉及电池技术领域，公开了一种电芯、电池及电子设备，包括电芯主体和设于电芯主体的至少两极耳，电芯主体由电极组件卷绕而成，电芯还包括第一连接件和至少两绝缘件；第一连接件沿电芯主体的长度方向设置，用于将电极组件的尾端固定于电芯主体的外表面；至少两极耳包括第一极耳和第二极耳，至少两绝缘件包括第一绝缘件和第二绝缘件，第一绝缘件和第二绝缘件的第一端均设于电芯主体，第一绝缘件的第二端覆盖部分第一极耳，第二绝缘件的第二端覆盖部分第二极耳；沿电芯主体的宽度方向，第一绝缘件靠近第一连接件设置，第一绝缘件的至少部分位于第一连接件外。通过上述方式，增大了第一绝缘件的粘结力，提高电芯的稳定性及能量密度。

Description

一种电芯、电池及电子设备
本申请要求于2021年11月01日提交中国专利局，申请号为202122651483.X，名称为“一种电芯、电池及电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及电池技术领域，尤其涉及一种电芯、电池及电子设备。
背景技术
一般卷绕式电芯于电芯主体的侧部收尾，且电芯最外圈极片尾部粘连有连接件，且在极耳与电芯主体的连接处也会设有绝缘件。
本申请实施例的发明人在实现本发明的过程中，发现：在电芯主体收尾侧的极耳的边距较小时，该极耳上的绝缘胶纸会完全贴附于连接件上，影响绝缘件的粘结力，影响电芯的稳定性。另外，由于绝缘件完全贴附于连接件上增加了电芯厚度，影响电芯的能量密度。
发明内容
为解决上述技术问题，本申请实施例提供一种电芯、电池及电子设备，以提高电池的稳定性及能量密度。
本申请实施例解决其技术问题提供以下技术方案：提供一种电芯，包括电芯主体和设于所述电芯主体的至少两极耳，所述电芯主体由第一极片和第二极片层叠设置形成的电极组件卷绕而成，其中，所述电极组件的尾端为自由端，所述第一极片和所述第二极片之间设有隔膜，所述电芯还包括第一连接件和至少两个绝缘件，所述第一连接件沿所述电芯主体的长度方向设置，用于将所述电极组件的尾端固定于所述电芯主体的外表面，所述至少两极耳 包括极性相反的第一极耳和第二极耳，所述至少两个绝缘件包括第一绝缘件和第二绝缘件，所述第一绝缘件的第一端设于所述电芯主体，所述第一绝缘件的第二端覆盖部分所述第一极耳，所述第二绝缘件的第一端设于所述电芯主体，所述第二绝缘件的第二端覆盖部分所述第二极耳。
其中，沿所述电芯主体的宽度方向，所述第一绝缘件靠近所述第一连接件设置，所述第一绝缘件的至少部分位于所述第一连接件外。
通过上述方式，使得第一绝缘件非完全贴附于所述第一连接件上，避免所述电芯顶封时，所述第一绝缘件翘起，影响电芯的稳定性，同时，在一定程度上减小了第一绝缘件与第一连接件的重叠区域，提高了电芯的能量密度。
在一些实施例中，所述第一连接件与所述电芯主体相接触的一面设有粘结层。
在一些实施例中，所述第一连接件的正反两面均设有粘结层。从而可以增加所述绝缘件的粘结力，提高所述电芯的稳定性。
在一些实施例中，沿所述电芯主体的宽度方向，所述第一绝缘件与所述第一连接件部分重叠。沿所述电芯主体的宽度方向，所述第一连接件的宽度减小，避免所述第一绝缘件完全贴附于所述第一连接件上，增加所述第一绝缘件的粘结力，提高了电芯的稳定性。
在一些实施例中，靠近所述第一绝缘件与所述第一连接件之间具有间隙。使得第一绝缘件完全置于第一连接件外，可完全避免第一绝缘件翘起。
在一些实施例中，沿所述电芯主体的长度方向，所述第一连接件设有缺口，所述第一绝缘件设于所述电芯主体的部分置于所述缺口。通过上述方式，增加了绝缘件的粘结力，提高了电芯的稳定性，同时减小第一连接件与绝缘件的重叠区域，提高了电芯的能量密度。
在一些实施例中，所述电芯还包括第三极耳，所述第三极耳的极性与所述第一极耳的极性相同，所述至少两个绝缘件还包括第三绝缘件，所述第三绝缘件的第一端设于所述电芯主体，所述第三绝缘件的第二端覆盖部分所述 第三极耳，沿所述电芯主体的宽度方向，所述第二极耳设于所述第一极耳与所述第三极耳之间。
在一些实施例中，所述第一绝缘件、所述第二绝缘件和所述第三绝缘件一体成型。增加了绝缘件的粘结力，提高了电芯的稳定性。
在一些实施例中，所述电芯主体的外表面包括第一平面、第二平面、第一弧面和第二弧面，沿所述电芯主体的厚度方向，所述第一平面和所述第二平面相对设置，沿所述电芯主体的宽度方向，所述第一弧面和所述第二弧面相对设置，且，所述第一弧面和所述第二弧面连接于所述第一平面和所述第二平面之间。
在一些实施例中，所述电极组件的尾端位于所述第一弧面，所述第一连接件于所述第一平面经所述第一弧面延伸于所述第二平面。
在一些实施例中，所述电极组件的尾端为所述第一极片或隔膜，沿所述电芯主体的长度方向，所述第一连接件完全覆盖所述第二极片。从而使得第一连接件和隔膜一起保护所述第二极片，避免所述第二极片的毛刺影响所述电芯。
在一些实施例中，所述电极组件的尾端位于所述第一平面，所述第一连接件于所述第一平面经所述第一弧面延伸于所述第二平面。
在一些实施例中，所述电极组件的尾端为所述第一极片，所述第一极片的收尾端设有空箔区，或者，所述电极组件的尾端为隔膜。
在一些实施例中，沿所述电极组件电芯主体的长度方向，所述第一连接件覆盖部分所述第一平面，且所述第一连接件与任一所述绝缘件均具有间隙。从而避免第一连接件与绝缘件重叠，增加了绝缘件的粘结力，提高了电芯的稳定性和能量密度。
在一些实施例中，沿所述电芯主体的宽度方向，所述电芯主体的边缘与第一绝缘件之间距离d1大于或等于0。
在一些实施例中，沿所述电芯主体的宽度方向，每一所述绝缘件的宽度 d2的范围为：7mm≤d2≤15mm。
在一些实施例中，沿所述电芯主体的宽度方向，所述第一连接件与所述第一绝缘件重叠区域的宽度d3的范围为2mm≤d3≤8mm。
在一些实施例中，沿所述电芯主体的宽度方向，所述第一绝缘件设于所述第一连接件外的宽度d4的范围为：d4≥3mm。
本申请实施例还提供一种电池，包括上述的电芯。
本申请实施例还提供一种电子设备，包括上述的电池，所述电池用于提供电能。
本申请实施例的有益效果：
与现有技术相比较，在本申请实施例提供的一种电芯、电池及电子设备通过至少两个绝缘件中靠近第一连接件的绝缘件的至少部分位于第一连接件外，避免绝缘件完全贴附于第一连接件上，增大了绝缘件的粘结力，提高电芯的稳定性及能量密度。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍。显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本申请其中一实施例提供的电芯的结构示意图；
图2是图1所示电芯中一实施方式下电芯的平面示意图；
图3是图1所示的电芯中沿电芯主体厚度方向第一极耳处的剖视图；
图4是现有技术中电芯的平面示意图；
图5是图1所示电芯中一实施方式下电芯的平面示意图；
图6是图1所示电芯中一实施方式下电芯的平面示意图；
图7是图1所示电芯中一实施方式下电芯的平面示意图；
图8是图1所示电芯中一实施方式下电芯的平面示意图；
图9是图1所示电芯中一实施方式下电芯的平面示意图；
图10是图1所示电芯中一实施方式下电芯的平面示意图。
具体实施方式
为了便于理解本申请，下面结合附图和具体实施例，对本申请进行更详细的说明。需要说明的是，当元件被表述“固定于”/“连接于”另一个元件，它可以直接在另一个元件上、或者其间可以存在一个或多个居中的元件。当一个元件被表述“连接”另一个元件，它可以是直接连接到另一个元件、或者其间可以存在一个或多个居中的元件。本说明书所使用的术语“端部”、“下部”、“向后”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。
除非另有定义，本说明书所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是用于限制本申请。
此外，下面所描述的本申请不同实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
此外，下面所描述的本申请不同实施例中所涉及的技术特征只要彼此之间未构成冲突就可以相互结合。
请一并参阅图1和图2，图1为本申请实施例提供一种电芯1的结构示意图，图2为电芯1于浅坑面和深坑面的平面示意图，电芯1包括电芯主体100和设于所述电芯主体的至少两极耳，所述电芯主体由第一极片10和第二极片 20层叠设置形成的电极组件卷绕而成，所述第一极片10和所述第二极片20的极性相反。其中，所述电极组件的尾端为自由端，所述第一极片10和所述第二极片20之间设有隔膜30。所述电极组件的首端围绕一卷针卷绕，直至卷绕至所述电极组件的尾端，并且卷绕过程完成后，卷针从所述电芯主体中取出。
进一步地，所述电芯1还包括第一连接件40和至少两个绝缘件50，所述第一连接件40沿所述电芯主体的长度方向设置，用于将所述电极组件的尾端固定于所述电芯主体的外表面，所述至少两个绝缘件50设于所述电芯主体并覆盖所述至少两极耳，其中，沿所述电芯主体的宽度方向，所述至少两个绝缘件中靠近所述第一连接件40的绝缘件50的至少部分位于所述第一连接件40外。
需要说明的是，所述电极组件的尾端是指所第一极片10、隔膜30和所述第二极片20绕上述卷针卷绕后的收尾端，也即，卷绕完成后，位于所述电芯主体最外圈的收尾端通过所述第一连接件40固定于所述电芯主体的外表面。
所述第一极片10包括第一集流体11和第一活性物质层12，所述第一活性物质层12设置于所述第一集流体11表面，所述第二极片20包括第二集流体21和第二活性物质层22，所述第二活性物质层22设置于所述第二集流体21表面。
在本申请的实施例中，所述第一极片10为阴极片，所述第一集流体11可选为铝箔层，所述第一活性物质层12为阴极活性物质层，可选为LiCo02、LiFeP04等可脱嵌锂离子的电化学活性物质。所述第二极片20为阳极片，所述第二集流体21可选为铜箔层，所述第二活性物质层22可选为石墨、软碳、硬碳、Li4Ti5012等可嵌锂离子的电化学活性物质。
可以理解，所述电芯主体最外圈的收尾端可以为第一极片、第二极片或隔膜。例如，所述第一极片10的收尾端13为所述电芯主体的最外圈的极片的结构，所述第一极片10的收尾端13上的所述第一活性物质层12覆盖所述 第一集流体11朝向所述第二极片20的一侧表面，所述第一极片10的收尾端13上所述第一集流体11背离所述第二极片20的一侧表面未涂覆所述第一活性物质层12。
在一些实施例中，所述电芯主体的外表面包括第一平面101、第二平面102、第一弧面103和第二弧面104，沿所述电芯主体的厚度方向，所述第一平面101和所述第二平面102相对设置，沿所述电芯主体的宽度方向，所述第一弧面103和所述第二弧面104相对设置，且，所述第一弧面103和所述第二弧面104连接于所述第一平面101和所述第二平面102之间。
在一些实施例中，所述第一平面101为浅坑面，所述第二平面102为深坑面。
所述至少两极耳包括至少一个第一极耳60及至少一个第二极耳70，所述第一极耳60连接所述第一极片10，所述第二极耳70连接所述第二极片20，所述第一极耳60和所述第二极耳70沿所述电芯主体厚度方向的投影不重叠。
沿所述电芯主体的长度方向，所述第一极耳60和所述第二极耳70伸出所述电芯主体的同一端。在其他实施例中，所述第一极耳60和所述第二极耳70可以从所述电芯主体的不同端伸出，对此，本申请不限定于此。
本申请以所述电芯包括三个极耳为例进行说明，例如，所述电芯1包括两个第一极耳60，一个第二极耳70，所述第一极耳60和所述第二极耳70交错布置，例如，沿所述电芯主体的宽度方向，三个极耳按第一极耳60、第二极耳70、第一极耳60的方式进行布置。
为了便于区分，两个第一极耳分别为第一极耳60a和第一极耳60b。
可以理解，所述绝缘件50的数量与所述极耳的数量一一对应，也即，所述绝缘件50的数量也为3个，每一所述绝缘件的一端均设于所述电芯主体，每一所述绝缘件的另一端均覆盖一对应的极耳。
具体地，请结合图3，所述至少两个绝缘件包括第一绝缘件51、第二绝缘件52和第三绝缘件53。为方便描述，以靠近所述第一连接件40的绝缘件 为第一绝缘件51，以靠近所述第一连接件40的极耳为第一极耳60a，也即所述第一绝缘件51的第一端设于所述电芯主体，所述第一绝缘件51的第二端覆盖部分所述第一极耳60a，所述第二绝缘件52的第一端设于所述电芯主体，所述第二绝缘件52的第二端覆盖部分所述第二极耳70，所述第三绝缘件53的第一端设于所述电芯主体，所述第三绝缘件53的第二端覆盖部分所述第一极耳60b。沿所述电芯主体的宽度方向，所述第一绝缘件51的至少部分位于所述第一连接件40外。
在一些实施例中，为方便对所述电芯1进行追溯，通常在所述第一平面设置标识码。
现有技术中，所述电极组件在卷绕形成电芯主体时，所述电极组件的尾端通常位于所述电芯主体的侧部，固定所述电极组件的尾部时，需使所述第一连接件从所述电芯主体的第一平面101延伸至所述电芯主体的第二平面102，如图4所示，然而，当极耳(靠近第一连接件的极耳)边距较小时，极耳上的绝缘件会完全贴附于所述第一连接件上，导致绝缘件的粘结力不足(通常第一连接件为单面胶，也即，所述第一连接件与所述第一极片和/或第二极片接触的一面设置有粘结层)，在电芯顶封时容易出现绝缘件翘起的现象，并且，绝缘件完全贴附于第一连接件上，使得二者的重叠区域较多，影响电芯的能量密度。
为此，本申请通过使第一绝缘件51的至少部分位于所述第一连接件40外，从而避免所述绝缘件完全贴附于所述第一连接件上，提高了电芯的稳定性和能量密度。
需要说明的是，所述电芯主体的侧部是指：沿所述电芯主体的厚度方向观察，靠近所述电芯主体长度方向的边缘的部分，也即所述电芯主体的外表面中第一弧面103或第二弧面104。
可以理解，所述电极组件的尾端可以位于所述电芯主体的侧部，也可以位于所述电芯主体的第一平面或第二平面。
值得注意的是：在所述电极组件的尾端位于所述电芯主体的侧部，且单面阴极片的收尾端(阴极片的收尾端上朝向阳极片的一侧涂覆有阴极活性物质，远离阳极片的一侧未涂覆阴极活性物质)位于所述电芯主体的最外圈时，沿所述电芯主体的长度方向，所述第一连接件40完全覆盖所述第二极片。也即，沿所述电芯主体的长度方向，所述第一连接件需超过所述第二极片，从而避免第二极片上的毛刺带来的危害。在所述电极组件的尾端位于所述电芯主体的第一平面或第二平面上时，则不作要求，只需所述第一连接件沿所述电芯主体的长度方向，覆盖部分所述第一平面或第二平面即可。
在一些实施例中，所述电极组件的尾端位于所述电芯主体的侧部，所述第一绝缘件51与所述第一连接件40部分重叠，如图2所示，具体地，沿所述电芯主体的宽度方向，所述第一绝缘件51一部分设于所述第一连接件40，所述第一绝缘件51的另一部分设于所述第一平面和/或第二平面。相对现有技术，沿所述电芯主体的宽度方向，所述第一连接件的宽度减窄，要在所述第一平面设置标识码，单独在所述第一平面贴附所述标识码，例如，所述电芯还包括第二连接件80，所述第二连接件80设于所述第一平面且与所述第一连接件40间隔设置，所述标识码设于所述第二连接件80。
在此种情况下，沿所述电芯主体的宽度方向，所述第一绝缘件与所述电芯主体边缘之间距离d1大于或等于0。
在一些实施例中，沿所述电芯主体的宽度方向，所述第一绝缘件的宽度d2的范围为：7mm≤d2≤15mm。
可以理解，所述第二绝缘件52及所述第三绝缘件53的宽度也需满足上述条件。
在一些实施例中，沿所述电芯主体的宽度方向，所述第一极耳60a在所述第一连接件上的宽度d3的范围为：2mm≤d3≤8mm。
在一些实施例中，沿所述电芯主体的宽度方向，所述第一绝缘件51设于所述第一连接件40外部分的宽度d4≥3mm，也即，所述第一绝缘件51与所 述第一连接件40的非重叠区域的宽度d4的范围为：d4≥3mm。
在一些实施例中，沿所述电芯主体的长度方向，所述绝缘件设于所述电芯主体部分的高度大于或等于3mm。
在一些实施例中，所述至少两个绝缘件50一体成型，也即，所述第一绝缘件51、第二绝缘件52及所述第三绝缘件53一体成型，如图5所示，以增加所述绝缘件与所述电芯主体的粘结面积。从而无需担心所述第一绝缘件51完全贴附于所述第一连接件40上时，所述电芯1顶封过程中所述第一绝缘件易翘起，造成所述电芯1不稳定。此时，所述第一连接件无需减窄，所述标识码可刻于所述第一连接件40上，而无需单独增加所述第二连接件80。
在一些实施例中，如图6所示，沿所述电芯主体的宽度方向，所述第一绝缘件51完全置于所述第一连接件40外。例如，所述第一绝缘件51与所述第一连接件40之间具有间隙，具体地，沿所述电芯主体的长度方向，所述第一连接件40设有缺口41，所述第一绝缘件51设于所述电芯主体的部分置于所述缺口41。
需要说明的是，当所述电极组件的尾端设于所述电芯主体的侧部，且所述电芯主体的最外圈为阴极片，所述缺口的尺寸需满足：沿所述电芯主体的长度方向，所述第一连接件40能完全覆盖阳极片，从而使得所述第一连接件和隔膜一起保护阳极片，避免阳极片的毛刺对电芯造成危害。。
在一些实施例中，为保证所述第一绝缘件51的粘结力，所述第一连接件40的正反两面均设有粘结层，如图7所示，此时，所述第一绝缘件51可以完全贴附于所述第一连接件40上，而无需担心所述电芯1顶封时所述第一绝缘件51翘起。
可以理解，在所述第一连接件41的正反两面均设有粘结层时，所述第一绝缘件51、所述第二绝缘件52及所述第三绝缘件53可以单独成型，如图7所示。或者所述第一绝缘件51、所述第二绝缘件52及所述第三绝缘件53也可一体成型，如图9所示。或者所述第一连接件40上也可设置所述缺口41， 如图8所示。所述标识码可视情况设于所述第一连接件或第二连接件。
在一些实施例中，所述电芯主体的最外圈为第一极片，所述第一极片的收尾端13包括两面均未涂覆所述第一活性物质层12的空箔区，所述第一极片的收尾端13(所述电极组件的尾端)设于所述电芯主体的第一平面101或第二平面102，如图10所示。在该实施方式下，沿所述电芯主体的长度，所述第一连接件40覆盖部分所述第一平面或第二平面即可，只要确保沿所述电芯主体的长度方向，所述第一连接件与任一绝缘件之间均具有间隙即可。从而可以完全避免所述第一连接件与所述绝缘件重叠。此时，所述标识码可刻于所述第一连接件40上。
可以理解，在上述实施方式中，对于所述电芯主体的最外圈为隔膜30也同样适用，在此，本申请将不再赘述。
本申请实施例还提供一种电池，包括上述的电芯1。
本申请实施例还提供一种电子设备，包括上述的电池。
上述的电子设备可以为电动汽车、扫地机器人、手机或平板等。
与现有技术相比较，本申请实施例提供的一种电芯、电池及电子设备通过至少两个绝缘件中靠近第一连接件的绝缘件的至少部分位于第一连接件外。避免绝缘件完全贴附于第一连接件上，增大了绝缘件的粘结力，提高电芯的稳定性及能量密度。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；在本申请的思路下，以上实施例或者不同实施例中的技术特征之间也可以进行组合，步骤可以以任意顺序实现，并存在如上所述的本申请的不同方面的许多其它变化，为了简明，它们没有在细节中提供；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征 进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (20)

  1. 一种电芯，包括电芯主体和设于所述电芯主体的至少两极耳，所述电芯主体由第一极片和第二极片层叠设置形成的电极组件卷绕而成，所述电极组件的尾端为自由端，所述第一极片和所述第二极片之间设有隔膜，其特征在于，所述电芯还包括第一连接件和至少两个绝缘件；
    所述第一连接件沿所述电芯主体的长度方向设置，用于将所述电极组件的尾端固定于所述电芯主体的外表面；
    所述至少两极耳包括极性相反的第一极耳和第二极耳，所述至少两个绝缘件包括第一绝缘件和第二绝缘件，所述第一绝缘件的第一端设于所述电芯主体，所述第一绝缘件的第二端覆盖部分所述第一极耳，所述第二绝缘件的第一端设于所述电芯主体，所述第二绝缘件的第二端覆盖部分所述第二极耳；
    其中，沿所述电芯主体的宽度方向，所述第一绝缘件靠近所述第一连接件设置，所述第一绝缘件的至少部分位于所述第一连接件外。
  2. 根据权利要求1所述的电芯，其特征在于，
    所述第一连接件与所述电芯主体相接触的一面设有粘结层。
  3. 根据权利要求1所述的电芯，其特征在于，
    所述第一连接件的正反两面均设有粘结层。
  4. 根据权利要求2或3所述的电芯，其特征在于，沿所述电芯主体的宽度方向，所述第一绝缘件与所述第一连接件部分重叠。
  5. 根据权利要求2或3所述的电芯，其特征在于，
    所述第一绝缘件与所述第一连接件之间具有间隙。
  6. 根据权利要求5所述的电芯，其特征在于，
    沿所述电芯主体的长度方向，所述第一连接件设有缺口，所述第一绝缘件设于所述电芯主体的部分置于所述缺口。
  7. 根据权利要求1所述的电芯，其特征在于，
    所述电芯还包括第三极耳，所述第三极耳的极性与所述第一极耳的极性相同，所述至少两个绝缘件还包括第三绝缘件，所述第三绝缘件的第一端设于所述电芯主体，所述第三绝缘件的第二端覆盖部分所述第三极耳，沿所述电芯主体的宽度方向，所述第二极耳设于所述第一极耳与所述第三极耳之间。
  8. 根据权利要求7所述的电芯，其特征在于，
    所述第一绝缘件、所述第二绝缘件和所述第三绝缘件一体成型。
  9. 根据权利要求7或8所述的电芯，其特征在于，
    所述电芯主体的外表面包括第一平面、第二平面、第一弧面和第二弧面，沿所述电芯主体的厚度方向，所述第一平面和所述第二平面相对设置，沿所述电芯主体的宽度方向，所述第一弧面和所述第二弧面相对设置，且，所述第一弧面和所述第二弧面连接于所述第一平面和所述第二平面之间。
  10. 根据权利要求9所述的电芯，其特征在于，
    所述电极组件的尾端位于所述第一弧面，所述第一连接件于所述第一平面经所述第一弧面延伸于所述第二平面。
  11. 根据权利要求9所述的电芯，其特征在于，
    所述电极组件的尾端位于所述第一平面，所述第一连接件于所述第一平 面经所述第一弧面延伸于所述第二平面。
  12. 根据权利要求10所述的电芯，其特征在于，
    所述电极组件的尾端为所述第一极片或隔膜，沿所述电芯主体的长度方向，所述第一连接件完全覆盖所述第二极片。
  13. 根据权利要求11所述的电芯，其特征在于，
    所述电极组件的尾端为所述第一极片，所述第一极片的收尾端设有空箔区；或
    所述电极组件的尾端为隔膜。
  14. 根据权利要求13所述的电芯，其特征在于，
    沿所述电芯主体的长度方向，所述第一连接件与任一所述绝缘件均具有间隙。
  15. 根据权利要求7或8所述的电芯，其特征在于，
    沿所述电芯主体的宽度方向，所述电芯主体的边缘与所述第一绝缘件之间距离d1大于或等于0。
  16. 根据权利要求7或8所述的电芯，其特征在于，
    沿所述电芯主体的宽度方向，每一所述绝缘件的宽度d2的范围为：7mm≤d2≤15mm。
  17. 根据权利要求4所述的电芯，其特征在于，
    沿所述电芯主体的宽度方向，所述第一连接件与所述第一绝缘件重叠区域的宽度d3的范围为2mm≤d3≤8mm。
  18. 根据权利要求4所述的电芯，其特征在于，
    沿所述电芯主体的宽度方向，所述第一绝缘件设于所述第一连接件外的宽度d4的范围为：d4≥3mm。
  19. 一种电池，其特征在于，包括权利要求书1至18任一项所述的电芯。
  20. 一种电子设备，其特征在于，包括如权利要求书19所述的电池，所述电池用于提供电能。
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