WO2022170451A1 - 电芯以及应用所述电芯的电子装置 - Google Patents

电芯以及应用所述电芯的电子装置 Download PDF

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Publication number
WO2022170451A1
WO2022170451A1 PCT/CN2021/076149 CN2021076149W WO2022170451A1 WO 2022170451 A1 WO2022170451 A1 WO 2022170451A1 CN 2021076149 W CN2021076149 W CN 2021076149W WO 2022170451 A1 WO2022170451 A1 WO 2022170451A1
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WO
WIPO (PCT)
Prior art keywords
empty foil
foil area
active material
bending section
current collector
Prior art date
Application number
PCT/CN2021/076149
Other languages
English (en)
French (fr)
Inventor
闫聪飞
Original Assignee
宁德新能源科技有限公司
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 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202180041175.5A priority Critical patent/CN115702518A/zh
Priority to JP2023548303A priority patent/JP2024506640A/ja
Priority to PCT/CN2021/076149 priority patent/WO2022170451A1/zh
Priority to EP21925134.5A priority patent/EP4293788A4/en
Publication of WO2022170451A1 publication Critical patent/WO2022170451A1/zh
Priority to US18/454,354 priority patent/US20230395871A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • 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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • 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 present application relates to the field of battery technology, and in particular, to a battery cell and an electronic device using the battery cell.
  • the current common pole-tab center cell mainly adopts the following structure: one is to set a tab groove exposing a blank current collector in the active material layer of the tab, and fix the tab in the tab groove, but In cells with a width of less than 30mm, there is a problem of overlapping of cathode and anode tabs. The overlapping of tabs and slots will make the thickness of the cell inconsistent. At the same time, the problem of lithium precipitation in the slot will further deteriorate the cycle, resulting in cycle residual capacity or cycle expansion, etc. Poor performance.
  • the other is to open a tab groove on the pole piece, but in the width direction of the pole piece, the width of the tab groove is slightly larger than the short groove at the fixed end of the tab, which is easy to form lithium precipitation;
  • the area not coated with active material will cause lithium precipitation in the area corresponding to the groove of the anode tab on the cathode electrode.
  • An embodiment of the present application provides a battery cell, including an electrode assembly, the electrode assembly includes: a first pole piece, including a first current collector and a first active material layer disposed on the surface of the first current collector, the first electrode A current collector further includes a first empty foil area without the first active material layer; a second pole piece includes a second current collector and a second active material layer disposed on the surface of the second current collector, the The second current collector further includes a second empty foil area where the second active material layer is not disposed; a diaphragm is disposed between the first pole piece and the second pole piece; the electrode assembly passes through the first pole piece.
  • a pole piece, the separator and the second pole piece are wound in sequence; in the winding direction of the electrode assembly, each layer from the second layer to the second outer layer of the first pole piece
  • Each includes a first flat section, a first bending section and a second bending section respectively disposed on both sides of the first flat section, and the first bending section and the second bending section are respectively the The part where the two sides of each layer in the first pole piece are bent, the first empty foil area is arranged on the first flat section, and the two sides of the first empty foil area are respectively connected with the first bend.
  • the folded section is connected to the second folded section, and in the length direction of the electrode assembly, the first active material layer is not provided in the first empty foil area.
  • each of the second layer to the second outer layer of the second pole piece includes a second flat segment, which is respectively disposed on the The third bending section and the fourth bending section on both sides of the second flat section, the third bending section and the fourth bending section respectively occur on both sides of each layer in the second pole piece
  • the second empty foil area is arranged on the second flat section, and both sides of the second empty foil area are respectively connected with the third bending section and the fourth bending section,
  • the second active material layer is not provided in the second empty foil region.
  • the first active material layer is provided on the other surface of the first current collector opposite to the first empty foil region;
  • the second active material layer is disposed on the other surface opposite to the second empty foil region.
  • the center line of symmetry of the first empty foil region or the second empty foil region and the center line of symmetry of the electrode assembly are respectively The distance is less than or equal to 2mm.
  • the first empty foil area is disposed opposite to the second empty foil area.
  • two sides of the first empty foil area respectively exceed the two sides of the second empty foil area and the two sides corresponding to the first empty foil area.
  • the width is 0-4mm.
  • the electrode assembly further includes a first tab electrically connected to the first empty foil region, a second tab electrically connected to the second empty foil region, a first insulating layer, and A second insulating layer, the first insulating layer is disposed in the first empty foil area, and the second insulating layer is disposed in the second empty foil area.
  • the first tab is fixed to the first empty foil area by welding, and the first insulating layer covers the surface of the first tab; or, the second tab is The tab is fixed on the second empty foil area by welding, and the second insulating layer covers the surface of the second tab.
  • the first active material layers are respectively provided on two surfaces of the winding starting section of the first current collector, and the two surfaces of the winding ending section of the second current collector are respectively provided with the first active material layer.
  • the surfaces are respectively provided with the second active material layers.
  • the winding starting section of the second current collector includes a fifth bending section, and in the thickness direction of the electrode assembly, the fifth bending section is connected to the first current collector.
  • the winding start segments of the fluid do not overlap.
  • the first active material layer is provided on the surfaces of the first bending section and the second bending section.
  • the first active material layer is not provided on the surface of the first bending section and the second bending section extending from the first empty foil region.
  • the first active material layer is provided on the first flat section of the first pole piece adjacent to the first empty foil region.
  • An embodiment of the present application also provides an electrical device, the electrical device includes a working module and a battery, the battery provides electrical energy for the working module, and the battery includes the aforementioned battery cells.
  • the tabs and the empty foil area for arranging the tabs are arranged on the flat section of the cell, that is, the tabs and the empty foil for arranging the tabs.
  • the area is not set in the winding section of the cell, which avoids uneven thickness of the cell and reduces the risk of lithium precipitation in the cell;
  • a layer of insulating glue can be attached to the area to cover the burrs on the current collector to reduce the risk of short circuit, and reducing the number of insulating glue layers can reduce the thickness of the cell.
  • the back of the empty foil area with tabs is provided with an active material layer The energy density of the cell can be increased.
  • FIG. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present application.
  • FIG. 2 is a partial enlarged schematic diagram of a first empty foil area of a battery cell according to an embodiment of the present application.
  • FIG. 3 is a partial enlarged schematic diagram of a second empty foil area of a battery cell according to an embodiment of the present application.
  • FIG. 4 is a schematic plan view of the front side and the back side of the first empty foil area of the battery cell according to an embodiment of the present application.
  • FIG. 5 is a schematic plan view of the front side and the back side of the second empty foil area of the cell according to an embodiment of the present application.
  • FIG. 6 is a partial enlarged schematic diagram of a first empty foil area of a battery cell according to another embodiment of the present application.
  • FIG. 7 is a partial enlarged schematic diagram of a second empty foil area of a battery cell according to another embodiment of the present application.
  • FIG. 8 is a partially enlarged schematic diagram of a first empty foil area of a battery cell according to another embodiment of the present application.
  • FIG. 9 is a partial enlarged schematic diagram of a second empty foil area of a battery cell according to another embodiment of the present application.
  • FIG. 10 is a schematic diagram of an electronic device according to an embodiment of the present application.
  • the first empty foil area 110 is the first empty foil area 110
  • the first collector 111 The first collector 111
  • the first active material layer 112 is the first active material layer 112
  • the second collector 121 The second collector 121
  • the third empty foil area 1211 is the third empty foil area 1211
  • FIG. 1 is a schematic structural diagram of a battery cell 1 according to an embodiment of the application
  • FIG. 2 is a partial enlarged schematic diagram of a first empty foil area 110 of the battery cell 1 according to an embodiment of the application
  • FIG. 3 is a battery cell according to an embodiment of the application.
  • the battery cell 1 includes an electrode assembly 10 , and the electrode assembly 10 includes a first pole piece 11 , a second pole piece 12 and a separator 13 .
  • the first pole piece 11 includes a first current collector 111 and a first active material layer 112 disposed on the surface of the first current collector 111 , and the first current collector 111 further includes a first empty foil without the first active material layer 112 region 110;
  • the second pole piece 12 includes a second current collector 121 and a second active material layer 122 disposed on the surface of the second current collector 121, and the second current collector 121 further includes a second void where the second active material layer 122 is not disposed
  • the foil area 120 the diaphragm 13 is arranged between the first pole piece 11 and the second pole piece 12 .
  • the electrode assembly 10 is formed by stacking the first pole piece 11 , the separator 13 and the second pole piece 12 in sequence and then winding.
  • the first pole piece 11 and the second pole piece 12 are arranged at intervals, and the diaphragm 13 is arranged between the first pole piece 11 and the second pole piece 12 so that the first pole piece 11 It is insulated from the second pole piece 12 to avoid short circuit caused by the contact between the first pole piece 11 and the second pole piece 12 .
  • each of the second layer to the second outer layer of the first pole piece 11 includes a first flat section 113 , and first bends disposed on both sides of the first flat section 113 respectively.
  • Section 114 and second bending section 115, the first bending section 114 and the second bending section 115 are respectively the parts where both sides of each layer in the first pole piece 11 are bent, and the first empty foil area 110 is provided
  • the first flat section 113 two sides of the first empty foil area 110 are respectively connected with the first bending section 114 and the second bending section 115 , and in the length direction of the electrode assembly 10 , the first empty foil area 110 is not
  • the first active material layer 112 is provided.
  • each of the second layer to the sub-outer layer of the first pole piece 11 includes a first flat section 113 , and the first flat section 113 extends horizontally for the cell 1 during the winding process. And the part that is not bent due to the winding of the cell 1; the first bending section 114 and the second bending section 115 respectively arranged on both sides of the first flat section 113 are the first pole piece 11 on the cell 1. During the winding process, bending occurs to realize the winding part of the battery core 1 .
  • the thickness of the first pole piece 11 at the first empty foil area 110 is smaller than the thickness of the first pole piece 11 adjacent to the first empty foil area 110 , and the first empty foil area 110 is arranged at the first flat section 113 It can avoid the thickness of the battery core 1 being uneven due to the portion of the first pole piece 11 having a smaller thickness extending to the winding and bending area.
  • the first empty foil area 110 is disposed on at least one first flat section 113 , and two sides of the first empty foil area 110 can be respectively connected with a first bending section 114 and a second bending section 115 . Connected so that the first empty foil region 110 can occupy a first flat section 113 .
  • the surfaces of the first bending section 114 and the second bending section 115 are provided with the first active material layer 112 ; the first bending section 114 and the second bending section 115 extend from the first empty foil area
  • the first active material layer 112 is not provided on the surface of 110 .
  • the first flat section 113 of the first pole piece 11 adjacent to the first empty foil region 110 is provided with the first active material layer 112 .
  • each of the second layer to the second outer layer of the second pole piece 12 includes a second flat section 123 , and third bends disposed on both sides of the second flat section 123 respectively.
  • the section 124 and the fourth bending section 125, the third bending section 124 and the fourth bending section 125 are respectively the parts where both sides of each layer in the second pole piece 12 are bent, and the second empty foil area 120 is provided
  • the second empty foil area 120 is not The second active material layer 122 is provided.
  • each of the second layer to the sub-outer layer of the second pole piece 12 includes a second flat section 123 , and the second flat section 123 extends horizontally for the cell 1 during the winding process. And the part that is not bent due to the winding of the cell 1; the third bending section 124 and the fourth bending section 125 respectively arranged on both sides of the second flat section 123 are the second pole piece 12 on the cell 1. During the winding process, bending occurs to realize the winding part of the battery core 1 .
  • the thickness of the second pole piece 12 at the second empty foil region 120 is smaller than the thickness of the second pole piece 12 adjacent to the second empty foil region 120 , and the second empty foil region 120 is disposed at the second flat section 123
  • the thickness of the battery core 1 can be prevented from being uneven due to the portion of the second pole piece 12 having a smaller thickness extending to the winding and bending area.
  • the second empty foil area 120 is disposed on at least one second flat section 123 , and two sides of the second empty foil area 120 can be respectively connected with a third bending section 124 and a fourth bending section 125 . Connected so that the second empty foil region 120 can occupy a second flat section 123 .
  • the surfaces of the third bending section 124 and the fourth bending section 125 are provided with the second active material layer 122; the third bending section 124 and the fourth bending section 125 extend from the second empty foil area
  • the second active material layer 122 is not provided on the surface of 120 .
  • a second active material layer 122 is provided on the second flat section 123 of the second pole piece 12 adjacent to the second empty foil region 120 .
  • the first empty foil area 110 and the second empty foil area 120 are disposed opposite to each other.
  • the first empty foil area 110 and the second empty foil area 120 are respectively disposed on the adjacent first pole pieces 11 and the second poles.
  • the first empty foil area 110 is disposed toward the second empty foil area 120
  • the second empty foil area 120 is disposed toward the first empty foil area 110 at the same time, so that the first empty foil area of the first active material layer 112 is not disposed 110 corresponds to the second empty foil region 120 where the second active material layer 122 is not provided, so as to avoid the problem of uneven thickness of the cell and lithium precipitation caused by dislocation.
  • the distance between the center line of symmetry of the first empty foil region 110 or the second empty foil region 120 and the center line of symmetry of the electrode assembly 10 is less than or equal to 2 mm, that is, , the first empty foil area 110 and the second empty foil area 120 are arranged in the middle area of the cell 1 to improve the flatness of the cell 1 .
  • the widths of the two sides of the first empty foil region 110 beyond the second empty foil region 120 and the corresponding sides of the first empty foil region 110 are 0 to 4 mm, respectively.
  • the first pole piece 11 may be the cathode of the battery cell 1
  • the second pole piece 12 may be the anode of the battery cell 1
  • the two edges of the first empty foil area 110 respectively extend beyond the second empty foil area 120 . Corresponding edges on both sides can avoid lithium deposition in the electrode and improve the safety performance of the battery cell 1 .
  • FIG. 4 is a schematic plan view of the front side and the back side of the first empty foil area 110 of the battery cell 1 provided by the embodiment of the application; Two schematic plan views of the front side and the back side of the empty foil region 120 .
  • the first active material layer 112 is provided on the other surface of the first current collector 111 opposite to the first empty foil area 110 ; Two active material layers 122 .
  • a first active material layer 112 and a second active material layer 122 are respectively disposed on the backsides of the first empty foil region 110 and the second empty foil region 120 , that is, the first empty foil region 110 and the second empty foil region 120 , respectively.
  • the empty foil area 120 is arranged on one side, so that the thickness of the first pole piece 11 where the first empty foil area 110 is arranged and the thickness of the second pole piece 12 where the second empty foil area 120 is arranged are compared with the traditional The thickness of the double-sided slotted empty foil area has less influence on the overall thickness uniformity of the cell 1 during winding or stacking;
  • the active material layer 112 is provided with a second active material layer 122 on the back side of the second pole piece 12 corresponding to the second empty foil area 120, which increases the total amount of active material in the battery core 1, and further improves the volume of the battery cell 1. Energy density of cell 1.
  • the first empty foil region 110 is not provided with the first active material layer 112
  • the second empty foil region 120 is not provided with the second active material layer 112 .
  • the material layer 122 that is, the opposite sides of the first empty foil region 110 and the second empty foil region 120 extend to the edges of the first current collector 111 and the second current collector 121, respectively, the first empty foil region 110 and the second empty foil region 110.
  • the foil regions 120 are each provided with openings on both sides, which provide a complete stress relief window for the expansion of the first pole piece 11 and the second pole piece 12 during the electrochemical cycle.
  • the electrode assembly 10 further includes a first tab 15 electrically connected to the first empty foil region 110 , a second tab 16 electrically connected to the second empty foil region 120 , a first insulating layer 17 and a second insulating layer 18 .
  • the layer 17 is disposed in the first empty foil area 110
  • the second insulating layer 18 is disposed in the second empty foil area 120 .
  • the first tab 15 is fixed in the first empty foil area 110 by welding, the first insulating layer 17 covers at least the surface of the first tab 15; the second tab 16 is fixed in the second empty foil area 120 by welding, and the second tab 16 is The insulating layer 18 covers at least the surface of the second tab 16 .
  • the first current collector 111 and the second current collector 121 can be made of copper foil, aluminum foil and other materials with good electrical conductivity and ductility, and the first tab 15 can be welded by resistance welding, ultrasonic welding, or laser welding.
  • the first current collector 111 is fixed and electrically connected to the first current collector 111 by means of conductive adhesive bonding, and the second tab 16 can also be fixed to the first current collector 111 by means of resistance welding, ultrasonic welding, laser welding, conductive adhesive bonding, etc. electrical connection.
  • the first insulating layer 17 is disposed in the first empty foil area 110 and covers at least the first tab 15 and the connection area between the first tab 15 and the first current collector 111, so as to cover at least the first tab 15 and the first collector
  • the burrs that may be generated during the connection between the fluids 111 avoid the short circuit of the cell 1
  • the second insulating layer 18 is arranged in the second empty foil area 120 and covers at least the second tab 16 and the second tab 16 and the second current collector
  • the connection area of 121 can at least cover the burrs that may be generated when the second tab 16 is connected to the second current collector 121 to avoid short circuit of the cell 1 .
  • the first insulating layer 17 may only cover the first tab 15 and the welding area between the first tab 15 and the first current collector 111 ; the second insulating layer 18 may Only the second tab 16 and the welding area between the second tab 16 and the second current collector 121 are covered.
  • the first insulating layer 17 covers the first tab 15 and the surface of the first current collector 111 corresponding to the first empty foil region 110 is not provided with the first tab 15 Other areas; the second insulating layer 18 can cover the second tab 16 and other areas where the second tab 16 and the second current collector 121 are not provided on the surface of the second current collector 121 corresponding to the second empty foil area 120 .
  • the first insulating layer 17 covers the first empty foil region 110 and covers the first tab 15 , and both ends of the first insulating layer 17 can overlap the first active
  • the surface of the material layer 112 covers the first empty foil area 110 ;
  • the second insulating layer 18 covers the second empty foil area 120 and covers the second tab 16 , and both ends of the second insulating layer 18 can be overlapped on the second active material layer 122 surface to cover the second empty foil area 120 .
  • the first active material layers 112 are respectively provided on the two surfaces of the winding starting section of the first current collector 111
  • the second active material layers 112 are respectively provided on the two surfaces of the winding ending section of the second current collector 121 .
  • Active material layer 122 is
  • the winding starting section of the second current collector 121 includes a fifth bending section 1210 .
  • the winding starting of the fifth bending section 1210 and the first current collector 111 is Segments do not overlap.
  • the winding starting section of the second pole piece 12 may include a third empty foil area 1211, the third empty foil area 1211 is connected to the fifth bending section 1210, and the fifth bending section 1210 may be For the pre-folded structure, the fifth bent section 1210 is further connected with the flat section of the second pole piece 12 .
  • the fifth bending section 1210 may be disposed toward the winding center of the cell 1, and the length of the third empty foil area 1211 may be less than half of the width of the winding core.
  • the fifth bending section 1210 and the first The winding starting section of the current collector 111 does not overlap to prevent the single-sided area of the first pole piece 11 from being folded, and the pre-folded fifth bending section 1210 can be used to make up for the difference in thickness of the cell 1, so that the cell 1 The thickness is more flat.
  • FIG. 10 it is a schematic diagram of an electronic device 100 according to an embodiment of the present application.
  • the present application further provides an electronic device 100 , the electronic device includes a working module 101 and a battery 102 , the battery 102 provides electrical energy for the working module 101 , and the battery 102 includes the aforementioned battery cell 1 .
  • the electronic device 100 is only a mobile phone as an example.
  • the electronic device 100 can also be a personal computer, a smart home appliance, an industrial controller, an electric vehicle, a gasoline-electric hybrid vehicle, or the like.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Secondary Cells (AREA)
  • Battery Electrode And Active Subsutance (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

一种电芯，包括电极组件，电极组件包括：第一极片，包括第一集流体和设置于第一集流体表面的第一活性物质层，第一集流体还包括未设置第一活性物质层的第一空箔区；第二极片；隔膜，设置在第一极片与第二极片之间；电极组件通过第一极片、隔膜、第二极片依序卷绕而成；在电极组件的卷绕方向，第一极片的第二层至次外层中的每一层各包括第一平坦段、分别设置在第一平坦段两侧的第一弯折段和第二弯折段，第一弯折段和第二弯折段分别为第一极片中每一层的两侧发生弯折的部分，第一空箔区设置在第一平坦段，第一空箔区的两侧分别与第一弯折段和第二弯折段连接，且在电极组件的长度方向上，第一空箔区未设置第一活性物质层。一种用电装置包括所述电芯。

Description

电芯以及应用所述电芯的电子装置 技术领域
本申请涉及电池技术领域，尤其涉及一种电芯以及应用所述电芯的电子装置。
背景技术
随着锂离子电池商业化的发展，市场对电芯的充电速度，充放电的温升，能量密度及倍率放电性能的要求越来越高，为此，极耳中置电芯应运而生。
但，目前常见的极耳中置电芯主要采用如下结构：一种是在极耳的活性物质层中设置露出空白集流体的极耳凹槽，将极耳固定在极耳凹槽中，但在宽度小于30mm的电芯中存在阴阳极极耳槽位重叠的问题，极耳槽位重叠会使电芯厚度不一致，同时槽位析锂问题会进一步恶化循环，导致循环剩余容量或者循环膨胀等性能较差。另一种是在极片上开设极耳凹槽，但在极片的宽度方向上，极耳凹槽的宽度为略大于极耳固定端的短凹槽，该凹槽容易形成析锂；同时这部分不涂敷活性物质的区域会造成阴极极片上与阳极极耳凹槽对应的区域析锂，为了防止该区域析锂，需要在阳极极耳槽位对应的阴极极片上贴绝缘胶来阻止锂离子的脱出，阳极极耳位置处有一般设置有至少两层保护胶纸，使得电芯厚度的增加。
如何解决上述问题，是本领域技术人员需要考虑的。
发明内容
为了解决现有技术中极耳凹槽的设置所造成的析锂、电芯厚度不均、能量密度较低的问题。
本申请实施例提供一种电芯，包括电极组件，所述电极组件包括：第一极片，包括第一集流体和设置于所述第一集流体表面的第一活性物质层，所述第一集流体还包括未设置所述第一活性物质层的第一空箔区；第二极片，包括第二集流体和设置于所述第二集流体表面的第二活性物质层，所述第二集流体还包括未设置所述第二活性物质层的第二空箔区；隔膜，设置在所述第一极片与所述第二极片之间；所述电极组件通过所述第一极片、所述隔膜、所述第二极片依序卷绕而成；在所述电极组件的卷绕方向，所述第一极片的第二层至次外层中的每一层各包括第一平坦段、分别设置在所述第一平坦段两侧的第一弯折段和第二弯折段，所述第一弯折段和所述第二弯折段分别为所述第一极片中每一层的两侧发生弯折的部分，所述第一空箔区设置在所述第一平坦段，所述第一空箔区的两侧分别与所述第一弯折段和所述第二弯折段连接，且在所述电极组件的长度方向上，所述第一空箔区未设置所述第一活性物质层。
在一种可能的实施方式中，在所述电极组件的卷绕方向，所述第二极片的第二层至次外层中的每一层各包括第二平坦段、分别设置在所述第二平坦段两侧的第三弯折段和第四弯折段，所述第三弯折段和所述第四弯折段分别为所述第二极片中每一层的两侧发生弯折的部分，所述第二空箔区设置在所述第二平坦段，所述第二空箔区的两侧分别与所述第三弯折段和所述第四弯折段连接，且在所述电极组件的长度方向上，所述第二空箔区未设置所述第二活性物质层。
在一种可能的实施方式中，所述第一集流体在与所述第一空箔区相背的另一表面设置有所述第一活性物质层；或者所述第二集流体在与所述第二空箔区相背的另一表面设置有所述第二活性物质层。
在一种可能的实施方式中，在所述电极组件的宽度方向，所述第一空箔区或所述第二空箔区的中心对称线分别与所述电极组件的中心对称线之间的距离小于或等于2mm。
在一种可能的实施方式中，所述第一空箔区与所述第二空箔区相对设置。
在一种可能的实施方式中，在所述电极组件的宽度方向，所述第一空箔区的两侧分别超出所述第二空箔区与所述第一空箔区相对应两侧的宽度为0-4mm。
在一种可能的实施方式中，所述电极组件还包括电连接所述第一空箔区的第一极耳、电连接所述第二空箔区的第二极耳、第一绝缘层以及第二绝缘层，所述第一绝缘层设置于所述第一空箔区，所述第二绝缘层设置于所述第二空箔区。
在一种可能的实施方式中，所述第一极耳通过焊接固定在所述第一空箔区，所述第一绝缘层覆盖在所述第一极耳的表面；或者，所述第二极耳通过焊接固定在所述第二空箔区，所述第二绝缘层覆盖在所述第二极耳的表面。
在一种可能的实施方式中，所述第一集流体的卷绕起始段的两个表面分别设置有所述第一活性物质层，所述第二集流体的卷绕收尾段的两个表面分别设置有所述第二活性物质层。
在一种可能的实施方式中，所述第二集流体的卷绕起始段包括 第五弯折段，在所述电极组件的厚度方向，所述第五弯折段与所述第一集流体的卷绕起始段不重叠。
在一种可能的实施方式中，所述第一弯折段和所述第二弯折段的表面设有所述第一活性物质层。
在一种可能的实施方式中，所述第一弯折段和所述第二弯折段延伸自所述第一空箔区的表面不设置所述第一活性物质层。
在一种可能的实施方式中，与所述第一空箔区相邻的所述第一极片的第一平坦段设有所述第一活性物质层。
本申请的实施例还提供了一种用电装置，所述用电装置包括工作模块和电池，所述电池为所述工作模块提供电能，所述电池包括前述的电芯。
相比于现有技术，本申请的电芯，一方面通过使极耳及用于设置极耳的空箔区设置于电芯的平坦段，即，极耳及用于设置极耳的空箔区未设置于电芯的卷绕段，避免了电芯厚度不均并降低了电芯析锂的风险；另一方面，用于设置极耳的空箔区为单面结构，仅在空箔区贴附一层绝缘胶即可实现覆盖集流体上的毛刺以降低短路风险的效果，且减少绝缘胶层数可降低电芯厚度，设置有极耳的空箔区的背面设置有活性物质层可增大电芯的能量密度。
附图说明
图1为本申请一实施例提供电芯的结构示意图。
图2为本申请一实施例提供的电芯的第一空箔区的局部放大示意图。
图3为本申请一实施例提供的电芯的第二空箔区的局部放大示意图。
图4为本申请一实施例提供的电芯的第一空箔区的正面及背面的平面示意图。
图5为本申请一实施例提供的电芯的第二空箔区的正面及背面的平面示意图。
图6为本申请另一实施例提供的电芯的第一空箔区的局部放大示意图。
图7为本申请另一实施例提供的电芯的第二空箔区的局部放大示意图。
图8为本申请又一实施例提供的电芯的第一空箔区的局部放大示意图。
图9为本申请又一实施例提供的电芯的第二空箔区的局部放大示意图。
图10为本申请实施例的电子装置的示意图。
主要元件符号说明
电芯                        1
电极组件                    10
第一极片                    11
第一空箔区                  110
第一集流体                  111
第一活性物质层              112
第一平坦段                  113
第一弯折段                  114
第二弯折段                  115
第二极片                    12
第二空箔区                  120
第二集流体                  121
第五弯折段                  1210
第三空箔区                  1211
第二活性物质层              122
第二平坦段                  123
第三弯折段                  124
第四弯折段                  125
隔膜                        13
第一极耳                    15
第二极耳                    16
第一绝缘层                  17
第二绝缘层                  18
电子装置                    100
工作模块                    101
电池                        102
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
以下描述将参考附图以更全面地描述本申请内容。附图中所示为本申请的示例性实施例。然而，本申请可以以许多不同的形式来实施，并且不应该被解释为限于在此阐述的示例性实施例。提供这些示例性实施例是为了使本申请透彻和完整，并且将本申请的范围 充分地传达给本领域技术人员。类似的附图标记表示相同或类似的组件。
本文使用的术语仅用于描述特定示例性实施例的目的，而不意图限制本申请。如本文所使用的，除非上下文另外清楚地指出，否则单数形式“一”，“一个”和“该”旨在也包括复数形式。此外，当在本文中使用时，“包括”和/或“包含”和/或“具有”，整数，步骤，操作，组件和/或组件，但不排除存在或添加一个或多个其它特征，区域，整数，步骤，操作，组件，组件和/或其群组。
除非另外定义，否则本文使用的所有术语(包括技术和科学术语)具有与本申请所属领域的普通技术人员通常理解的相同的含义。此外，除非文中明确定义，诸如在通用字典中定义的那些术语应该被解释为具有与其在相关技术和本申请内容中的含义一致的含义，并且将不被解释为理想化或过于正式的含义。
以下内容将结合附图对示例性实施例进行描述。须注意的是，参考附图中所描绘的组件不一定按比例显示；而相同或类似的组件将被赋予相同或相似的附图标记表示或类似的技术用语。
下面参照附图，对本申请的具体实施方式作进一步的详细描述。
图1为本申请实施例提供电芯1的结构示意图；图2为本申请实施例提供的电芯1的第一空箔区110的局部放大示意图；图3为本申请实施例提供的电芯1的第二空箔区120的局部放大示意图。
电芯1包括电极组件10，电极组件10包括第一极片11、第二极片12以及隔膜13。其中，第一极片11包括第一集流体111和设置于第一集流体111表面的第一活性物质层112，第一集流体111还包括未设置第一活性物质层112的第一空箔区110；第二极片12 包括第二集流体121和设置于第二集流体121表面的第二活性物质层122，第二集流体121还包括未设置第二活性物质层122的第二空箔区120；隔膜13设置在第一极片11与第二极片12之间。
电极组件10通过第一极片11、隔膜13、第二极片12依序堆叠后卷绕而成。
于一实施例中，卷绕过程中，使第一极片11与第二极片12间隔设置，且隔膜13设于第一极片11与第二极片12之间使第一极片11与第二极片12绝缘以避免第一极片11与第二极片12发生接触造成短路。
在电极组件10的卷绕方向，第一极片11的第二层至次外层中的每一层各包括第一平坦段113、分别设置在第一平坦段113两侧的第一弯折段114和第二弯折段115，第一弯折段114和第二弯折段115分别为第一极片11中每一层的两侧发生弯折的部分，第一空箔区110设置在第一平坦段113，第一空箔区110的两侧分别与第一弯折段114和第二弯折段115连接，且在电极组件10的长度方向上，第一空箔区110未设置第一活性物质层112。
于一实施例中，第一极片11的第二层至次外层中的每一层各包括一第一平坦段113，该第一平坦段113为电芯1在卷绕过程中水平延伸且并未因电芯1的卷绕而发生弯曲的部分；分别设置在第一平坦段113两侧的第一弯折段114和第二弯折段115为第一极片11在电芯1卷绕过程中发生弯曲以实现电芯1卷绕的部分。第一空箔区110处的第一极片11的厚度小于与该第一空箔区110相邻的第一极片11的厚度，将第一空箔区110设置于第一平坦段113处可避免第一极片11上厚度较小的部分延伸至卷绕弯折区造成电芯1厚度不 均。
于一实施例中，第一空箔区110设置于至少一个第一平坦段113上，第一空箔区110的两侧可分别与一个第一弯折段114和一个第二弯折段115连接以使得第一空箔区110可占据一个第一平坦段113。在其他实施例中，第一弯折段114和第二弯折段115的表面设有第一活性物质层112；第一弯折段114和第二弯折段115延伸自第一空箔区110的表面不设置第一活性物质层112。在其他实施例中，与第一空箔区110相邻的第一极片11的第一平坦段113设有第一活性物质层112。
在电极组件10的卷绕方向，第二极片12的第二层至次外层中的每一层各包括第二平坦段123、分别设置在第二平坦段123两侧的第三弯折段124和第四弯折段125，第三弯折段124和第四弯折段125分别为第二极片12中每一层的两侧发生弯折的部分，第二空箔区120设置在第二平坦段123，第二空箔区120的两侧分别与第三弯折段124和第四弯折段125连接，且在电极组件10的长度方向上，第二空箔区120未设置第二活性物质层122。
于一实施例中，第二极片12的第二层至次外层中的每一层各包括一第二平坦段123，该第二平坦段123为电芯1在卷绕过程中水平延伸且并未因电芯1的卷绕而发生弯曲的部分；分别设置在第二平坦段123两侧的第三弯折段124和第四弯折段125为第二极片12在电芯1卷绕过程中发生弯曲以实现电芯1卷绕的部分。第二空箔区120处的第二极片12的厚度小于与该第二空箔区120相邻的第二极片12的厚度，将第二空箔区120设置于第二平坦段123处可避免第二极片12上厚度较小的部分延伸至卷绕弯折区造成电芯1厚度不 均。
于一实施例中，第二空箔区120设置于至少一个第二平坦段123上，第二空箔区120的两侧可分别与一个第三弯折段124和一个第四弯折段125连接以使得第二空箔区120可占据一个第二平坦段123。在其他实施例中，第三弯折段124和第四弯折段125的表面设有第二活性物质层122；第三弯折段124和第四弯折段125延伸自第二空箔区120的表面不设置第二活性物质层122。在其他实施例中，与第二空箔区120相邻的第二极片12的第二平坦段123设有第二活性物质层122。
第一空箔区110与第二空箔区120相对设置，于一实施例中，第一空箔区110与第二空箔区120分别设置于相邻的第一极片11及第二极片12上，第一空箔区110朝向第二空箔区120设置，第二空箔区120同时朝向第一空箔区110设置，使得未设置第一活性物质层112的第一空箔区110与未设置第二活性物质层122的第二空箔区120相对应，避免因错位导致的电芯厚度不均及析锂问题。
于一实施例中，在电极组件10的宽度方向，第一空箔区110或第二空箔区120的中心对称线分别与电极组件10的中心对称线之间的距离小于或等于2mm，即，第一空箔区110及第二空箔区120设于电芯1的中部区域，提升电芯1的平整度。
在电极组件10的宽度方向，第一空箔区110的两侧分别超出第二空箔区120与第一空箔区110相对应两侧的宽度为0至4mm。于一实施例中，第一极片11可以为电芯1的阴极，第二极片12可以为电芯1的阳极，第一空箔区110的两侧边缘分别超出第二空箔区120对应的两侧边缘可避免电极析锂，提升电芯1的安全性能。
如图4及图5所示，图4为本申请实施例提供的电芯1的第一空箔区110的正面及背面的平面示意图；图5为本申请实施例提供的电芯1的第二空箔区120的正面及背面的平面示意图。
第一集流体111在与第一空箔区110相背的另一表面设置有第一活性物质层112；第二集流体121在与第二空箔区120相背的另一表面设置有第二活性物质层122。于一实施例中，第一空箔区110及第二空箔区120的背侧分别设置有第一活性物质层112及第二活性物质层122，即，第一空箔区110与第二空箔区120单面设置，使得设有第一空箔区110处的第一极片11的厚度及第设有第二空箔区120处的第二极片12的厚度相较于传统的双面开槽的空箔区的厚度在卷绕或堆叠时对电芯1的整体厚度均匀性影响更小；且，第一极片11上对应第一空箔区110的背面设置有第一活性物质层112，第二极片12上对应第二空箔区120的背面设置有第二活性物质层122，增加电芯1中活性物质的总量，在体积不变的情况下，进一步提升电芯1的能量密度。
于一实施例中，在电极组件10的长度方向上，第一空箔区110未设置第一活性物质层112，在电极组件10的长度方向上，第二空箔区120未设置第二活性物质层122，即，第一空箔区110及第二空箔区120的相对两侧分别延伸至第一集流体111及第二集流体121的边缘，第一空箔区110及第二空箔区120均具备双侧开口，为电化学循环中的第一极片11及第二极片12的膨胀提供完整的应力释放窗口。
电极组件10还包括电连接第一空箔区110的第一极耳15、电连接第二空箔区120的第二极耳16、第一绝缘层17以及第二绝缘 层18，第一绝缘层17设置于第一空箔区110，第二绝缘层18设置于第二空箔区120。第一极耳15通过焊接固定在第一空箔区110，第一绝缘层17至少覆盖在第一极耳15的表面；第二极耳16通过焊接固定在第二空箔区120，第二绝缘层18至少覆盖在第二极耳16的表面。
于一实施例中，第一集流体111及第二集流体121可以为铜箔、铝箔等具备良好导电能力及延展性的材质，第一极耳15可通过电阻焊接，超声波焊接，激光焊接，导电胶粘结等方式与第一集流体111固定并实现电连接，第二极耳16亦可通过电阻焊接，超声波焊接，激光焊接，导电胶粘结等方式与第一集流体111固定并实现电连接。使第一绝缘层17设置于第一空箔区110并至少覆盖第一极耳15以及第一极耳15与第一集流体111的连接区域，以至少覆盖第一极耳15与第一集流体111之间连接时可能产生的毛刺，避免电芯1短路；使第二绝缘层18设置于第二空箔区120并至少覆盖第二极耳16以及第二极耳16与第二集流体121的连接区域，以至少覆盖第二极耳16与第二集流体121之间连接时可能产生的毛刺，避免电芯1短路。
在本实施例中，如图2及图3所示，第一绝缘层17可仅覆盖第一极耳15以及第一极耳15与第一集流体111的焊接区域；第二绝缘层18可仅覆盖第二极耳16以及第二极耳16与第二集流体121的焊接区域。
在其他实施例中，如图6及图7所示，第一绝缘层17覆盖第一极耳15以及第一空箔区110对应的第一集流体111的表面未设置第一极耳15的其他区域；第二绝缘层18可覆盖第二极耳16以及第二空箔区120对应的第二集流体121的表面未设置第二极耳16与第二 集流体121的其他区域。
在其他实施例中，如图8及图9所示，第一绝缘层17覆盖第一空箔区110并覆盖第一极耳15，第一绝缘层17的两端可搭接在第一活性物质层112表面以覆盖第一空箔区110；第二绝缘层18覆盖第二空箔区120并覆盖第二极耳16，第二绝缘层18的两端可搭接在第二活性物质层122表面以覆盖第二空箔区120。
于一实施例中，第一集流体111的卷绕起始段的两个表面分别设置有第一活性物质层112，第二集流体121的卷绕收尾段的两个表面分别设置有第二活性物质层122。
于一实施例中，第二集流体121的卷绕起始段包括第五弯折段1210，在电极组件10的厚度方向，第五弯折段1210与第一集流体111的卷绕起始段不重叠。
于一实施例中，第二极片12的卷绕起始段包括也可以设置第三空箔区1211，第三空箔区1211与第五弯折段1210连接，第五弯折段1210可以为预折结构，第五弯折段1210进一步与第二极片12的平铺段连接。第五弯折段1210可朝向电芯1的卷绕中心设置，第三空箔区1211的长度可小于卷心宽度的一半，在电极组件10的厚度方向，第五弯折段1210与第一集流体111的卷绕起始段不重叠以防止第一极片11的单面区发生打折现象，且，预折的第五弯折段1210可用于弥补电芯1在厚度差，使电芯1厚度更加平整。
如图10所示，为本申请实施例提供的电子装置100的示意图。本申请还提供一种电子装置100，该电子装置包括工作模块101和电池102，电池102为工作模块101提供电能，电池102包括前述的电芯1。图10中仅以电子装置100为手机为例，在其它实施例中， 该电子装置100也可为个人计算机、智能家电、工业控制器、电动汽车、油电混动交通工具等。
上文中，参照附图描述了本申请的具体实施方式。但是，本领域中的普通技术人员能够理解，在不偏离本申请的精神和范围的情况下，还可以对本申请的具体实施方式作各种变更和替换。这些变更和替换都落在本申请所限定的范围内。

Claims (14)

  1. 一种电芯，包括电极组件，所述电极组件包括：
    第一极片，包括第一集流体和设置于所述第一集流体表面的第一活性物质层，所述第一集流体还包括未设置所述第一活性物质层的第一空箔区；
    第二极片，包括第二集流体和设置于所述第二集流体表面的第二活性物质层，所述第二集流体还包括未设置所述第二活性物质层的第二空箔区；
    隔膜，设置在所述第一极片与所述第二极片之间；及
    所述电极组件通过所述第一极片、所述隔膜、所述第二极片依序卷绕而成，其特征在于：
    在所述电极组件的卷绕方向，所述第一极片的第二层至次外层中的每一层各包括第一平坦段、分别设置在所述第一平坦段两侧的第一弯折段和第二弯折段，所述第一弯折段和所述第二弯折段分别为所述第一极片中每一层的两侧发生弯折的部分，所述第一空箔区设置在所述第一平坦段，所述第一空箔区的两侧分别与所述第一弯折段和所述第二弯折段连接，且在所述电极组件的长度方向上，所述第一空箔区未设置所述第一活性物质层。
  2. 如权利要求1所述的电芯，其特征在于，在所述电极组件的卷绕方向，所述第二极片的第二层至次外层中的每一层各包括第二平坦段、分别设置在所述第二平坦段两侧的第三弯折段和第四弯折段，所述第三弯折段和所述第四弯折段分别为所述第二极片中每一层的两侧发生弯折的部分，所述第二空箔区设置在所述第二平坦段，所述第二空箔区的两侧分别与所述第三弯折段和所述第四弯折段连 接，且在所述电极组件的长度方向上，所述第二空箔区未设置所述第二活性物质层。
  3. 如权利要求1所述的电芯，其特征在于，所述第一集流体在与所述第一空箔区相背的另一表面设置有所述第一活性物质层；或者所述第二集流体在与所述第二空箔区相背的另一表面设置有所述第二活性物质层。
  4. 如权利要求1所述的电芯，其特征在于，在所述电极组件的宽度方向，所述第一空箔区或所述第二空箔区的中心对称线分别与所述电极组件的中心对称线之间的距离小于或等于2mm。
  5. 如权利要求1所述的电芯，其特征在于，所述第一空箔区与所述第二空箔区相对设置。
  6. 如权利要求5所述的电芯，其特征在于，在所述电极组件的宽度方向，所述第一空箔区的两侧分别超出所述第二空箔区与所述第一空箔区相对应两侧的宽度为0至4mm。
  7. 如权利要求1所述的电芯，其特征在于，所述电极组件还包括电连接所述第一空箔区的第一极耳、电连接所述第二空箔区的第二极耳、第一绝缘层以及第二绝缘层，所述第一绝缘层设置于所述第一空箔区，所述第二绝缘层设置于所述第二空箔区。
  8. 如权利要求7所述的电芯，其特征在于，所述第一极耳通过焊接固定在所述第一空箔区，所述第一绝缘层覆盖在所述第一极耳的表面；或者，所述第二极耳通过焊接固定在所述第二空箔区，所述第二绝缘层覆盖在所述第二极耳的表面。
  9. 如权利要求1所述的电芯，其特征在于，所述第一集流体的卷绕起始段的两个表面分别设置有所述第一活性物质层，所述第二 集流体的卷绕收尾段的两个表面分别设置有所述第二活性物质层。
  10. 如权利要求1所述的电芯，其特征在于，所述第二集流体的卷绕起始段包括第五弯折段，在所述电极组件的厚度方向，所述第五弯折段与所述第一集流体的卷绕起始段不重叠。
  11. 如权利要求1所述的电芯，其特征在于，所述第一弯折段和所述第二弯折段的表面设有所述第一活性物质层。
  12. 如权利要求11所述的电芯，其特征在于，所述第一弯折段和所述第二弯折段延伸自所述第一空箔区的表面不设置所述第一活性物质层。
  13. 如权利要求1所述的电芯，其特征在于，与所述第一空箔区相邻的所述第一极片的第一平坦段设有所述第一活性物质层。
  14. 一种用电装置，其特征在于，所述用电装置包括工作模块和电池，所述电池为所述工作模块提供电能，所述电池包括如权利要求1至13中任意一项所述的电芯。
PCT/CN2021/076149 2021-02-09 2021-02-09 电芯以及应用所述电芯的电子装置 WO2022170451A1 (zh)

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