WO2021179261A1 - 卷绕式电芯及电化学装置 - Google Patents

卷绕式电芯及电化学装置 Download PDF

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Publication number
WO2021179261A1
WO2021179261A1 PCT/CN2020/079038 CN2020079038W WO2021179261A1 WO 2021179261 A1 WO2021179261 A1 WO 2021179261A1 CN 2020079038 W CN2020079038 W CN 2020079038W WO 2021179261 A1 WO2021179261 A1 WO 2021179261A1
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WIPO (PCT)
Prior art keywords
section
tab
segment
pole piece
wound
Prior art date
Application number
PCT/CN2020/079038
Other languages
English (en)
French (fr)
Inventor
杨典
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 CN202080005204.8A priority Critical patent/CN113519087A/zh
Priority to PCT/CN2020/079038 priority patent/WO2021179261A1/zh
Publication of WO2021179261A1 publication Critical patent/WO2021179261A1/zh
Priority to US17/708,952 priority patent/US20220223922A1/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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with 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
    • H01M50/531—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
    • 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 embodiments of the present application relate to the field of batteries, in particular to wound-type batteries and electrochemical devices.
  • Batteries have been widely used in various electronic products and electric vehicles. However, with the development of the commercialization of batteries, the market has increasingly higher requirements for the energy density of batteries. Therefore, the industry needs a wound cell and electrochemical device with higher energy density.
  • One of the objectives of the embodiments of the present application is to provide a wound cell and an electrochemical device, which can reduce the thickness of the wound cell and has a higher energy density and space utilization.
  • a wound cell includes a first pole piece, a second pole piece, and an isolation film, and the isolation film is disposed on the first pole piece and the second pole.
  • the wound cell has a thickness direction and is formed by the first A pole piece, the second pole piece and the central area enclosed by the isolation membrane;
  • the first pole piece includes: a first current collector, the first current collector includes: a first surface and the A second surface opposite to the first surface, the first surface is closer to the central region relative to the second surface;
  • the first section, the first section has a first end and a second end, the The first end is the winding start end of the first pole piece; and a second section, the second section has a third end and a fourth end, and the third end is connected to the second end;
  • the second section is flat, the first surface of the second section is provided with a first tab;
  • the second pole piece includes: a second tab, the second tab has
  • the isolation film has a fifth end and a sixth end, the fifth end is the winding start end of the isolation film, and the sixth end is the roll of the isolation film.
  • the fifth end does not overlap with the first end, the first tab and the second tab in the thickness direction.
  • the sixth end does not overlap with the first tab and the second tab in the thickness direction.
  • the isolation membrane has a first dividing line, and the first dividing line to the fifth end constitute a first part of the isolation membrane, and the shape of the first part is curved or In a planar shape, the first part does not overlap with the first tab and the second tab in the thickness direction.
  • it further includes a first insulating colloid, which covers the winding end of the second pole piece, and the first insulating colloid is in contact with the first tab and the second tab. There is no overlap in the thickness direction.
  • the winding end of the second pole piece does not overlap with the first tab and the second tab in the thickness direction.
  • the first surface and the second surface of the first section are not provided with a first active material layer; the first surface of the second section is not provided with a first active material layer; In the first active material layer, the second surface of the second section is provided with the first active material layer.
  • the first pole piece further includes: a third section and a fourth section, wherein the third section has a seventh end and an eighth end, and the seventh end Connected to the fourth end; the fourth section has a ninth end and a tenth end, the ninth end is connected to the eighth end, and the tenth end is the roll of the first pole piece Around the end; and wherein the first surface of the third section is not provided with the first active material layer, the second surface of the third section is provided with a first active material layer, the The first surface and the second surface of the fourth section are provided with a first active material layer.
  • the isolation film located between the second section and the third section has a coating or no coating.
  • the second pole piece includes a second current collector
  • the second current collector includes: a third surface and a fourth surface opposite to the third surface, the third surface Relative to the fourth surface, it is closer to the central area
  • the second pole piece further includes: a fifth section, a sixth section, and a seventh section, wherein the fifth section has an eleventh section End and twelfth end, the eleventh end is the winding start end of the second pole piece;
  • the sixth section has a thirteenth end and a fourteenth end, the thirteenth end and The twelfth end is connected;
  • the seventh section has a fifteenth end and a sixteenth end, the fifteenth end is connected to the fourteenth end, and the sixteenth end is the first The winding end of the diode piece; and wherein the third surface and the fourth surface of the fifth section are provided with a second active material layer; the third surface of the sixth section The second active material layer is provided; the third surface and the fourth surface of the seventh section are not provided with the second active material layer
  • the fifth section includes a first section, a second section, a third section, a fourth section, and a fifth section, wherein the first section, the The third section and the fifth section are planar, the second section and the fourth section are curved, and the first section is the starting section of the fifth section , The second section is connected to the first section, the third section is connected to the second section, the fourth section is connected to the third section, and the fifth section is connected to the third section.
  • the segment is the ending segment of the fifth segment;
  • the sixth segment includes the sixth segment, the seventh segment, the eighth segment, and the ninth segment, wherein the sixth segment and the The eighth section is curved, the seventh section and the ninth section are flat, the sixth section is the beginning section of the sixth section, and the seventh section Is connected to the sixth section, the eighth section is connected to the seventh section, the ninth section is connected to the eighth section, and the ninth section is the sixth section
  • the seventh section includes a tenth section and an eleventh section, wherein the tenth section is curved, the eleventh section is flat, and the first The tenth section is the beginning section of the seventh section, and the eleventh section is the ending section of the seventh section; wherein the fourth surface of the sixth section is provided with a Two insulating colloids, the starting end and ending end of the second insulating colloid are respectively coincident with the starting end and the ending end of the sixth section, and the starting end of the sixth section is connected to the fifth section;
  • the sixth end extends beyond the end ends of the second insulating colloid and the third insulating colloid, or the sixth end is in contact with the second insulating colloid and the third insulating colloid.
  • the end of the insulating gel is flush.
  • the first side of the second tab is disposed on the third surface of the eleventh segment.
  • the first side of the second tab is disposed on the fourth surface of the seventh segment.
  • the wound cell further includes a fourth insulating colloid covering the second side of the second tab.
  • the first insulating colloid covers the second side of the second tab.
  • the second tab is located below the eleventh segment.
  • the third segment has a first part
  • the third surface and the fourth surface of the first part are not provided with the second active material layer
  • the first The first side of the dipole ear is provided on one of the third surface and the fourth surface of the first part
  • the fifth segment has a second part
  • the second part The third surface and the fourth surface are not provided with the second active material layer
  • the first side of the second tab is provided on the third surface and the fourth surface of the second part
  • the wound-type battery cell further includes: a fifth insulating colloid, which is disposed on the second side of the second tab and shields the second side of the second tab connected to the The corresponding surface of the first part or the second part; and a sixth insulating colloid, which is opposite to the fifth insulating colloid and shields the first part that is not connected to the first side of the second tab The surface or the surface of the second part that is not connected to the first side of the second tab.
  • a seventh insulating layer is further included, which is disposed at a corresponding position of the first pole piece opposite to the fifth insulating colloid and the sixth insulating colloid.
  • an electrochemical device which includes the wound cell described in any of the above embodiments.
  • the wound cell and electrochemical device provided by the embodiments of the present application have a smaller thickness than the existing wound cell, and have higher energy density and space utilization.
  • FIG. 1A shows a schematic cross-sectional view of a wound battery core according to an embodiment of the present application
  • FIG. 1B shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • FIG. 1C shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application.
  • FIG. 1D shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • Fig. 1E shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • FIG. 1F shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application.
  • FIG. 1G shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application.
  • Fig. 1H shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • FIG. 1I shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • Fig. 1J shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • FIG. 1K shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • Fig. 1L shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • FIG. 1M shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application
  • FIG. 1N shows a schematic cross-sectional view of a wound battery core according to another embodiment of the present application.
  • the terms “about”, “approximately”, “substantially”, “substantially” and “similar” are used to describe and illustrate small changes.
  • the term can 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 can refer to a range of variation less than or equal to ⁇ 10% of the 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%.
  • the difference between two values is less than or equal to ⁇ 10% of the average value of the value (for example, less than or equal to ⁇ 5%, less than or equal to ⁇ 4%, less than or equal to ⁇ 3%, less than or equal to ⁇ 2%, less than or equal to ⁇ 1%, less than or equal to ⁇ 0.5%, less than or equal to ⁇ 0.1%, or less than or equal to ⁇ 0.05%), then the two values can be considered "substantially" the same.
  • a list of items connected by the terms “one of”, “one of”, “one of” or other similar terms can mean any of the listed items.
  • Project A can contain a single element or multiple elements.
  • Project B can contain a single element or multiple elements.
  • Project C can contain a single element or multiple elements.
  • a list of items connected by the terms “at least one of”, “at least one of”, “at least one of” or other similar terms may mean the listed items Any combination of. For example, if items A and B are listed, then the phrase “at least one of A and B” means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C” means only A; or only B; only C; A and B (excluding C); A and C (exclude B); B and C (exclude A); or all of A, B, and C.
  • Project A can contain a single element or multiple elements.
  • Project B can contain a single element or multiple elements.
  • Project C can contain a single element or multiple elements.
  • the wound battery core provided by the prior art has a low space utilization rate.
  • the inside of the cell structure and the winding process of the isolation film can be improved to obtain a winding type cell with only two layers of isolation film inside.
  • merely relying on reducing the number of isolation film layers inside the wound cell to improve the space utilization rate of the cell is not enough to meet the market's demand for higher energy density of the cell. Therefore, the industry needs to provide more effective technical solutions to obtain wound cells with higher energy density and space utilization.
  • the embodiments of the present application provide an improved wound cell and electrochemical device.
  • the central area of the wound cell has only two isolation films, it is designed to be located in the wound cell.
  • the positional relationship between the isolation film in the central area of the cell and the pole pieces and/or the tabs of the cell in the thickness direction of the cell in the central area effectively reducing the thickness of the cell, thereby improving the space utilization and energy density of the cell .
  • FIG. 1A shows a schematic cross-sectional view of a wound battery core 10I according to an embodiment of the present application.
  • a wound cell 10I according to an embodiment of the present application includes: a first pole piece 100, a second pole piece 200 and an isolation film 300.
  • the first pole piece 100, the second pole piece 200, and the isolation film 300 are wound to form a wound cell 10I.
  • the wound cell 10I has a thickness direction X, a length direction Y perpendicular to the thickness direction, and a central area S enclosed by the first pole piece 100, the second pole piece 200, and the isolation film 300.
  • the first pole piece 100 may include a first current collector 101.
  • the material of the first current collector 101 may include any material suitable for current collectors in the art.
  • the first current collector 101 may include, for example, but not limited to, a polymer layer and/or a metal layer.
  • the first current collector 101 may include a first surface 101a and a second surface 101b opposite to the first surface 101a. The first surface 101a is closer to the central area S than the second surface 101b.
  • the first pole piece 100 may include a first section 103, a second section 105, a third section 107, and a fourth section 109.
  • Each of the first section 103, the second section 105, the third section 107, and the fourth section 109 can be regarded as a part of the first current collector 101.
  • the first section 103, the second section 105, the third section 107, and the fourth section 109 together constitute the entire first current collector 101.
  • the first section 103 has a first end 103a and a second end 103b.
  • the first end 103 a may be the start end of the first section 103, that is, the winding start end of the first pole piece 100.
  • the second end 103b may be the end end of the first section 103.
  • the first surface 101a and the second surface 101b of the first section 103 may not be provided with an active material layer. That is, the portion of the first current collector 101 defined by the first section 103 may be a current collector that is not coated with any active material layer.
  • the first section 103 may include a curved and/or planar current collector.
  • the second section 105 is connected to the first section 103.
  • the second section 105 has a third end 105a and a fourth end 105b.
  • the third end 105a may be the starting end of the second section 105 and is connected to the second end 103b.
  • the fourth end 105b may be the ending end of the second section 105.
  • the second section 105 may only include a planar current collector.
  • the first surface 101 a of the second section 105 may be provided with a first tab 111.
  • the material of the first tab 111 may include metal.
  • the material of the first tab 111 may include copper.
  • the material of the first tab 111 may include nickel.
  • the material of the first tab 111 may include an alloy material of nickel, silver, or copper.
  • the material of the first tab 111 may include any material suitable for tabs in the art.
  • the first tab 111 can be connected to the first surface 101a of the second section 105 of the first current collector 101 by, for example, but not limited to, resistance welding, ultrasonic welding, conductive glue connection or any other suitable method.
  • the first tab 111 may be a negative tab. In other embodiments of the present application, the first tab 111 may be a positive tab.
  • the first surface 101a of the second section 105 may not be provided with an active material layer, and the second surface 101b of the second section 105 may be provided with a first active material layer 113. That is, the portion of the first current collector 101 defined by the second section 105 may be a current collector with only one surface coated with an active material layer.
  • the first active material layer 113 may include any active material layer materials commonly used in the art, such as, but not limited to, silicon carbon, conductive carbon black (Super P), binder styrene butadiene rubber (SBR), or lithium cobalt oxide (LiCoO2) and so on.
  • the third section 107 is connected to the second section 105.
  • the third section 107 has a seventh end 107a and an eighth end 107b.
  • the seventh end 107a may be the starting end of the third section 107 and is connected to the fourth end 105b.
  • the eighth end 107b may be the end end of the third section 107.
  • the third section 107 may include curved and flat current collectors.
  • the first surface 101a of the third section 107 may not be provided with any active material layer.
  • the second surface 101b of the third section 107 may be provided with a first active material layer 113. That is, the portion of the first current collector 101 defined by the third section 107 may be a current collector with only one surface coated with an active material layer.
  • the fourth section 109 is connected to the third section 107.
  • the fourth section 109 has a ninth end 109a and a tenth end 109b.
  • the ninth end 109a may be the starting end of the fourth section 109 and is connected to the eighth end 107b.
  • the tenth end 109b may be the end of the fourth section 109, that is, the end of the winding of the first pole piece 100.
  • the fourth section 109 may include curved and flat current collectors. Both the first surface 101a and the second surface 101b of the fourth section 109 can be provided with the first active material layer 113. That is, the portion of the first current collector 101 defined by the fourth section 109 may be a current collector whose two surfaces are coated with an active material layer.
  • the second pole piece 200 may include a second current collector 201.
  • the material of the second current collector 201 may include any material suitable for current collectors in the art.
  • the second current collector 201 may include, for example, but not limited to, a polymer layer and/or a metal layer.
  • the second current collector 201 may include a third surface 201a and a fourth surface 201b opposite to the third surface 201a.
  • the third surface 201a is closer to the central area S than the fourth surface 201b.
  • the second pole piece 200 may include a fifth section 203, a sixth section 205, and a seventh section 207.
  • Each of the fifth section 203, the sixth section 205, and the seventh section 207 can be regarded as a part of the second current collector 201.
  • the fifth section 203, the sixth section 205, and the seventh section 207 together constitute the entire second current collector 201.
  • the fifth section 203 has an eleventh end 203a and a twelfth end 203b.
  • the eleventh end 203 a may be the starting end of the fifth section 203, that is, the winding starting end of the second pole piece 200.
  • the twelfth end 203b may be the ending end of the fifth section 203.
  • the third surface 201 a and the fourth surface 201 b of the fifth section 203 may be provided with a second active material layer 213. That is, the portion of the second current collector 201 defined by the fifth section 203 may be a current collector whose two surfaces are coated with an active material layer.
  • the second active material layer 213 may include any active material layer commonly used in the art, such as, but not limited to, silicon carbon, conductive carbon black (Super P), binder styrene butadiene rubber (SBR), or lithium cobalt oxide (LiCoO2) and so on.
  • the materials of the second active material layer 213 and the first active material layer 113 may be the same or different.
  • the fifth section 203 may include a curved and/or planar current collector.
  • the fifth section 203 may include a first section 2031, a second section 2033, a third section 2035, a fourth section 2037 and a fifth section 2039.
  • Each of the first section 2031, the second section 2033, the third section 2035, the fourth section 2037, and the fifth section 2039 can be regarded as a part of the fifth section 203.
  • the first section 2031, the second section 2033, the third section 2035, the fourth section 2037, and the fifth section 2039 together constitute the entire fifth section 203.
  • the first section 2031 may be the starting section of the fifth section 203.
  • the first segment 2031 has a start end 2031a and an end end 2031b.
  • the starting end 2031a of the first section 2031 coincides with the eleventh end 203a of the fifth section 203.
  • the starting end 2031a is the winding starting end of the second pole piece 200.
  • the first section 2031 may be flat.
  • the second section 2033 is connected to the first section 2031.
  • the second segment 2033 has a start end 2033a and an end end 2033b.
  • the start end 2033a of the second segment 2033 is connected to the end end 2031b of the first segment 2031.
  • the second section 2033 may be curved.
  • the third section 2035 is connected to the second section 2033.
  • the third segment 2035 has a start end 2035a and an end end 2035b.
  • the start end 2035a of the third segment 2035 is connected to the end end 2033b of the second segment 2033.
  • the third section 2035 may be flat.
  • the fourth section 2037 is connected to the third section 2035.
  • the fourth segment 2037 has a start end 2037a and an end end 2037b.
  • the start end 2037a of the fourth segment 2037 is connected to the end end 2035b of the third segment 2035.
  • the fourth section 2037 may be curved.
  • the fifth section 2039 is connected to the fourth section 2037.
  • the fifth segment 2039 has a start end 2039a and an end end 2039b.
  • the start end 2039a of the fifth segment 2039 is connected to the end end 2037b of the fourth segment 2037.
  • the ending end 2039b coincides with the ending end 203b of the fifth section 203.
  • the fifth section 2039 is the ending section of the fifth section 203.
  • the fifth section 2039 may be flat.
  • the sixth section 205 is connected to the fifth section 203.
  • the sixth section 205 has a thirteenth end 205a and a fourteenth end 205b.
  • the thirteenth end 205a may be the starting end of the sixth section 205 and is connected to the twelfth end 203b.
  • the fourteenth end 205b may be the ending end of the sixth section 205.
  • the third surface 201 a of the sixth section 205 may be provided with a second active material layer 213.
  • the fourth surface 201b of the sixth section 205 may not be provided with the second active material layer 213. That is, the portion of the second current collector 201 defined by the sixth section 205 may be a current collector with only one surface coated with an active material layer.
  • the sixth section 205 may include a curved and/or planar current collector.
  • the sixth section 205 may include a sixth section 2051, a seventh section 2053, an eighth section 2055, and a ninth section 2057.
  • Each of the sixth section 2051, the seventh section 2053, the eighth section 2055, and the ninth section 2057 can be regarded as a part of the sixth section 205.
  • the sixth section 2051, the seventh section 2053, the eighth section 2055, and the ninth section 2057 together constitute the entire sixth section 205.
  • the sixth section 2051 may be the starting section of the sixth section 205.
  • the sixth section 2051 is connected to the fifth section 2039.
  • the sixth segment 2051 has a start end 2051a and an end end 2051b.
  • the start end 2051a is connected to the end end 2039b of the fifth segment 2039.
  • the fourth surface 201b of the sixth section 2051 is provided with a second insulating colloid 215.
  • the second insulating colloid 215 has a start end 215a and an end end 215b.
  • the start end 215a and the end end 215b coincide with the start end 2051a and the end end 2051b of the sixth segment 2051, respectively.
  • the second insulating colloid 215 may include any material suitable for insulating colloids in the art.
  • the sixth segment 2051 may be curved.
  • the seventh segment 2053 is connected to the sixth segment 2051.
  • the seventh segment 2053 has a start end 2053a and an end end 2053b.
  • the start end 2053a of the seventh segment 2053 is connected to the end end 2051b of the sixth segment 2051.
  • the seventh segment 2053 may be flat.
  • the eighth segment 2055 is connected to the seventh segment 2053.
  • the eighth segment 2055 has a start end 2055a and an end end 2055b.
  • the start end 2055a of the eighth segment 2055 is connected to the end end 2053b of the seventh segment 2053.
  • the eighth section 2055 may be curved.
  • the ninth segment 2057 is connected to the eighth segment 2055.
  • the ninth segment 2057 has a start end 2057a and an end end 2057b.
  • the start end 2057a of the ninth segment 2057 is connected to the end end 2055b of the eighth segment 2055.
  • the ending end 2057b coincides with the ending end 205b of the sixth section 205.
  • the ninth section 2057 is the ending section of the sixth section 205.
  • the ninth section 2057 may be flat.
  • the seventh section 207 is connected to the sixth section 205.
  • the seventh section 207 has a fifteenth end 207a and a sixteenth end 207b.
  • the fifteenth end 207a may be the start end of the seventh section 207 and is connected to the fourteenth end 205b.
  • the sixteenth end 207b may be the end end of the seventh section 207, that is, the winding end end of the second pole piece 200.
  • the third surface 201a and the fourth surface 201b of the seventh section 207 may not be provided with the second active material layer 213. That is, the portion of the second current collector 201 defined by the seventh section 207 may be a current collector that is not coated with any active material layer.
  • the seventh section 207 may include curved and flat current collectors.
  • the sixteenth end 207b may not overlap the first tab 100, the second tab 200, and the fifth end 301 of the isolation film 300 in the thickness direction X to reduce the thickness of the wound cell 10I.
  • the seventh section 207 may include a tenth section 2071 and an eleventh section 2073. Both the tenth section 2071 and the eleventh section 2073 can be regarded as a part of the seventh section 207. The tenth section 2071 and the eleventh section 2073 together constitute the entire seventh section 207.
  • the tenth section 2071 may be the starting section of the seventh section 207.
  • the tenth segment 2071 has a start end 2071a and an end end 2071b.
  • the start end 2071a of the tenth segment 2071 is connected to the end end 2057b of the ninth segment 2057.
  • the tenth section 2071 may be curved.
  • the third surface 201a of the tenth section 2071 is provided with a third insulating colloid 217. As shown in FIG.
  • the third insulating colloid 217 may include insulating colloid materials commonly used in the art.
  • the third insulating colloid 217 has a start end 217a and an end end 217b.
  • the start end 217a and the end end 217b coincide with the start end 2071a and the end end 2071b of the tenth segment 2071, respectively.
  • the eleventh segment 2073 is connected to the tenth segment 2071.
  • the eleventh segment 2073 has a start end 2073a and an end end 2073b.
  • the start end 2073a of the eleventh segment 2073 is connected to the end end 2071b of the tenth segment 2071.
  • the eleventh segment 2073 is the ending segment of the seventh segment 207.
  • the eleventh segment 2073 may be flat.
  • the third surface 201 a of the eleventh segment 2073 is provided with a second tab 211.
  • the second tab 211 has a first side 211 a and a second side 211 b opposite to the first side 211 a, and the first side 211 a is disposed on the third surface 201 a of the eleventh segment 2073 of the second pole piece 200.
  • the material of the second tab 211 may include metal.
  • the material of the second tab 211 may include copper.
  • the material of the second tab 211 may include nickel.
  • the material of the second tab 211 may include an alloy material of nickel, silver, or copper.
  • the material of the second tab 211 may include any material suitable for tabs in the art.
  • the second tab 211 can be connected to the third surface 201a of the eleventh segment 2073 of the second current collector 201 by, for example, but not limited to, resistance welding, ultrasonic welding, conductive glue connection and other suitable methods.
  • the second tab 211 is arranged on the right side of the first tab 111 and does not overlap with the first tab 111 in the thickness direction X.
  • the eleventh segment 2073 and the first tab 111 may not overlap in the thickness direction X.
  • the second tab 211 may be a positive tab. In other embodiments of the present application, the second tab 211 may be a negative tab.
  • the second tab 211 is on the right side of the first tab 111. In other embodiments of the present application, the second tab 211 may be on the left side of the first tab 111.
  • the second tab 211 does not overlap with the first end 103a of the first pole piece 100 and the first tab 111 in the thickness direction X, so as to further reduce the thickness of the wound cell 10I.
  • the isolation film 300 may be disposed between the first pole piece 100 and the second pole piece 200.
  • the isolation membrane 300 has a fifth end 301 and a sixth end 303.
  • the fifth end 301 is the winding start end of the isolation film 300.
  • the sixth end 303 is the winding end end of the isolation film 300.
  • the fifth end 301 overlaps the first tab 100 in the thickness direction X. In other embodiments of the present application, the fifth end 301 does not overlap the first tab 100 in the thickness direction X to further reduce the thickness of the wound cell 10I.
  • the sixth end 303 of the isolation film 300 does not overlap the first tab 111 and the second tab 211 in the thickness direction X.
  • the isolation film 300 may have a virtual first boundary line 305.
  • the portion where the first dividing line 305 to the fifth end 301 constitutes the isolation film 300 is defined as the first portion Q of the isolation film 300.
  • the shape of the first part Q may be flat.
  • the first portion Q overlaps the first tab 100 in the thickness direction X. In other embodiments of the present application, the first portion Q may not overlap the first tab 100 in the thickness direction X to further reduce the thickness of the wound cell 10I.
  • the isolation film 300 located between the second section 105 and the third section 107 may have a coating to improve the safety of the wound cell 10I. In other embodiments of the present application, the isolation film 300 located between the second section 105 and the third section 107 may not have a coating to reduce the thickness of the wound cell 10I.
  • the material of the isolation film 300 may include any material suitable for isolation films in the art.
  • the sixth end 303 of the isolation film 300 may be flush with the end end 215b of the second insulating colloid 215 and the end end 217b of the third insulating colloid 217, or the sixth end 303 may extend beyond the end end 215b and the third end 215b of the second insulating colloid 215.
  • the end 217b of the insulating colloid 217 is used to ensure the safety of the wound cell 10I.
  • the wound cell 10I may further include a first insulating gel 400 that covers the winding end 207b of the second pole piece 200 and fixes the second pole piece 200 to the seventh section 2053 of the wound cell 10I Above the fourth surface 201b.
  • the first insulating glue 400 may include insulating glue materials commonly used in the art, such as, but not limited to, insulating glue, polyolefin hot melt adhesive, ethylene and its copolymer hot melt adhesive, polyurethane hot melt adhesive, or polyolefin hot melt adhesive. Amide hot melt adhesives, etc.
  • the first insulating colloid 400 may not overlap the first tab 111 and the second tab 211 in the thickness direction X, so as to facilitate the maximization of the thickness space and further increase the energy density of the wound cell 10I.
  • the first tab 111 of the wound cell 10I provided in the embodiment of the present application is in the thickness direction. X may not overlap with the first end 103a of the first pole piece 100, so that the thickness of the cell 10 can be reduced.
  • the thickness of the position where the first tab 111 is located in the thickness direction X is composed of the thickness of the two isolation films 300 located in the central area S, the first tab 111 and the remaining components.
  • the thickness of the position where the second tab 211 is located in the thickness direction X is composed of the thickness of the second current collector 201, the second tab 211 and the remaining components. Therefore, compared with the existing wound battery core, the thickness of the wound battery core 10I provided in the embodiments of the present application can be relatively reduced, thereby having higher energy density and space utilization.
  • FIG. 1B shows a schematic cross-sectional view of a wound cell 10II according to another embodiment of the present application.
  • the difference between the wound cell 10II according to another embodiment of the present application and the wound cell 10I shown in FIG. 1 is only: the fifth end 301II of the isolation film 300II and the first tab 111II does not overlap in the thickness direction X.
  • the position of the first tab 111II is The thickness in the thickness direction X is composed of the thickness of the first tab 111 and the remaining components.
  • the thickness of the position where the second tab 211II is located in the thickness direction X is composed of the thickness of the second current collector 201II, the second tab 211II and the remaining components. Therefore, the wound battery core 10II provided by the embodiment of the present application has a further reduced thickness in the thickness direction X relative to the wound battery core 10I shown in FIG. 1A, thereby having a higher energy density.
  • FIG. 1C shows a schematic cross-sectional view of a wound battery core 10III according to another embodiment of the present application. As shown in FIG. 1C, the difference between the wound cell 10III according to another embodiment of the present application and the wound cell 10II shown in FIG. The shape of the first portion QIII defined by the fifth end 301III of the 300III is curved.
  • FIG. 1D shows a schematic cross-sectional view of a wound battery core 10IV according to another embodiment of the present application.
  • the wound battery core 10IV according to another embodiment of the present application differs from the wound battery core 10II shown in FIG. 1B only in that the second tab 211IV is located to the left of the first tab 111IV. side.
  • the first insulating colloid 400IV overlaps the fifth end 301IV of the isolation film 300IV in the thickness direction X. In other embodiments of the present application, the first insulating colloid 400IV may not overlap the fifth end 301IV of the isolation film 300IV in the thickness direction X, so as to further reduce the thickness of the wound cell 10IV.
  • the first insulating colloid 400IV does not overlap with the first end 103aIV of the first pole piece 100IV in the thickness direction X.
  • the thickness of the position where the first tab 111IV is located in the thickness direction X is composed of the thickness of the first tab 111IV, the second current collector 201IV and the remaining components.
  • the thickness of the position where the second tab 211IV is located in the thickness direction X is composed of the thickness of the second current collector 201IV, the second tab 211IV and the remaining components.
  • FIG. 1E shows a schematic cross-sectional view of a wound battery core 10V according to another embodiment of the present application.
  • the winding cell 10V according to another embodiment of the present application differs from the winding cell 10II shown in FIG. 1B only in that: the first side 211aV of the second tab 211V is arranged on the The fourth surface 201bV of the seven-segment 2053V.
  • the thickness of the position where the first tab 111V is located in the thickness direction X is composed of the thickness of the first tab 111V and the remaining components.
  • the thickness of the position where the second tab 211IV is located in the thickness direction X is composed of the thickness of the second tab 211V and the remaining components. Therefore, the wound battery core 10V provided by the embodiment of the present application can be further reduced in thickness in the thickness direction X relative to the wound battery core shown in FIGS. 1A-1D, thereby having a higher energy density.
  • the wound cell 10V may further include a fourth insulating colloid (not shown in the figure) covering the second side 211bV of the second tab 211V to prevent the second tab 211V from piercing the coil. Wound cell 10V packaging bag to avoid corrosion.
  • FIG. 1F shows a schematic cross-sectional view of a wound cell 10VI according to another embodiment of the present application. As shown in FIG. 1F, the difference between the wound cell 10IV according to another embodiment of the present application and the wound cell 10V shown in FIG. The shape of the first portion QVI defined by the fifth end 301VI of the 300VI is curved.
  • FIG. 1G shows a schematic cross-sectional view of a wound cell 10VII according to another embodiment of the present application.
  • the winding cell 10VII according to another embodiment of the present application differs from the winding cell 10V shown in FIG. 1E only in that the second tab 211VII is located to the left of the first tab 111VII.
  • the first insulating colloid 400VII overlaps the first tab 111VII in the thickness direction X.
  • the thickness of the position of the first tab 111VII in the thickness direction X is composed of the thickness of the first tab 111VII, the first insulating colloid 400VII and the remaining components.
  • the thickness of the position of the second tab 211VII in the thickness direction X is composed of the thickness of the second tab 211VII and the remaining components.
  • the first insulating colloid 400VII may not overlap with the first tab 111VII in the thickness direction X.
  • the thickness of the position of the first tab 111VII in the thickness direction X is composed of the thickness of the first tab 111VII and the remaining components.
  • the thickness of the position of the second tab 211VII in the thickness direction X is composed of the thickness of the second tab 211VII and the remaining components.
  • FIG. 1H shows a schematic cross-sectional view of a wound cell 10VIII according to another embodiment of the present application.
  • the shape of the first part QVIII defined by the fifth end 301VIII of the 300VIII is curved.
  • a part of the first part QVIII overlaps the second tab 211VIII in the thickness direction X.
  • the thickness of the position where the first tab 111VIII is located in the thickness direction X is composed of the thickness of the first tab 111VIII, the first insulating colloid 400VIII and the remaining components.
  • the thickness of the position of the second tab 211VIII in the thickness direction X is composed of the thickness of the second tab 211VIII, the two-layer isolation film 300 and the remaining components.
  • the first insulating colloid 400VIII may not overlap the first tab 111VIII in the thickness direction X, and the first portion QVIII may not overlap the second tab 211VIII in the thickness direction X.
  • the thickness of the position where the first tab 111VIII is located in the thickness direction X is composed of the thickness of the first tab 111VIII and the remaining components.
  • the thickness of the position where the second tab 211VIII is located in the thickness direction X is composed of the thickness of the second tab 211VIII and the remaining components.
  • FIG. 1I shows a schematic cross-sectional view of a wound battery core 10IX according to another embodiment of the present application.
  • the winding cell 10IX according to another embodiment of the present application differs from the winding cell 10V shown in FIG. 1E only in that the first insulating colloid 400IX covers the second tab 211IX The two sides 211bIX are used to prevent the second tab 211IX from piercing the packaging bag of the wound cell 10IX, thereby avoiding corrosion.
  • FIG. 1J shows a schematic cross-sectional view of a wound battery core 10X according to another embodiment of the present application.
  • the difference between the wound cell 10X according to another embodiment of the present application and the wound cell 10V shown in FIG. 1E is that the second tab 211X is located below the eleventh segment 2073X .
  • the thickness of the position of the first tab 111X in the thickness direction X is composed of the thickness of the first tab 111X and the remaining components.
  • the thickness of the position where the second tab 211X is located in the thickness direction X is composed of the thickness of the second tab 211X, the second current collector 201X and the remaining components.
  • FIG. 1K shows a schematic cross-sectional view of a wound battery core 10XI according to another embodiment of the present application.
  • the difference between the wound cell 10XI according to another embodiment of the present application and the wound cell 10X shown in FIG. 1J is that the first side 211aXI of the second tab 211XI is located in the third section.
  • Neither the third surface 201aXI nor the fourth surface 201bXI of the first part 2035cXI is provided with the first or second active material layer.
  • the wound cell 10XI also includes a fifth insulating colloid 500XI, which is disposed on the second side 211bXI of the second tab 211XI and shields the surface of the first part 2035cXI connected to the first side 211aXI of the second tab 211XI to prevent The welding burr of the second tab 211XI pierces the isolation film 300 and brings the risk of short circuit.
  • a fifth insulating colloid 500XI which is disposed on the second side 211bXI of the second tab 211XI and shields the surface of the first part 2035cXI connected to the first side 211aXI of the second tab 211XI to prevent The welding burr of the second tab 211XI pierces the isolation film 300 and brings the risk of short circuit.
  • the wound cell 10XI may further include a sixth insulating colloid 600XII, which is opposite to the fifth insulating colloid 500XII, and shielding the surface of the first part that is not connected to the first side 211aXI of the second tab 211XI to prevent the second The welding burr of the tab 211XI pierces the isolation film 300XI and brings the risk of short circuit.
  • the materials of the fifth insulating colloid 500XI and the sixth insulating colloid 600XI may include insulating colloid materials commonly used in the art.
  • the first side 211aXI of the second tab 211XI may be located on the fourth surface 201bXI of the second part of the fifth segment 2039XI.
  • the second part of the fifth section 2039XI is similar to the first part 2035cXI, the third surface 201aXI and the fourth surface 201bXI are not provided with an active material layer, and the fifth insulating colloid 500XI is provided on the second side 211bXI of the second tab 211XI And shield the surface of the second part connected to the second side 211bXI of the second tab 211XI, the sixth insulating colloid 600XI is opposite to the fifth insulating colloid 500XI, and shields the second part of the second tab 211XI that is not connected to the second tab 211XI.
  • FIG. 1L shows a schematic cross-sectional view of a wound battery core 10XII according to another embodiment of the present application.
  • the winding cell 10XII according to another embodiment of the present application differs from the winding cell 10XI shown in FIG. 1K only in that: the first side 211aXII of the second tab 211XII is located on the third
  • the first part 2035cXII of the segment 2035XII is the third surface 201aXII.
  • the third surface 201aXII and the fourth surface 201bXII of the first part 2035cXII are not provided with an active material layer.
  • the wound cell 10XII further includes a fifth insulating colloid 500XII, which is disposed on the second side 211bXII of the second tab 211XII and shields the surface of the first portion 2035cXII connected to the second side 211bXII of the second tab 211XII.
  • the wound cell 10XII may further include a sixth insulating colloid 600XII, which is opposite to the fifth insulating colloid 500XII and disposed on the surface of the first portion 2035cXII that is not connected to the first side 211aXII of the second tab 211XII.
  • the shape of the first part QXII defined by the first dividing line 305XII of the isolation film 300XII and the fifth end 301XII of the isolation film 300XII is curved.
  • the first side 211aXII of the second tab 211XII may be located on the third surface 201aXII of the second part of the fifth segment 2039XII.
  • the second part of the fifth section 2039XII is similar to the first part 2035cXII, and the third surface 201aXII and the fourth surface 201bXII are not provided with an active material layer.
  • the fifth insulating colloid 500XII is disposed on the second side 211bXII of the second tab 211XII and shields the surface of the second part connected to the second side 211bXII of the second tab 211XII.
  • the sixth insulating colloid 600XII is opposite to the fifth insulating colloid 500XII, and shields the surface of the second part that is not connected to the first side 211aXII of the second tab 211XII to prevent the welding burr of the second tab 211XII from piercing the isolation film The risk of short circuit caused by 300XII.
  • FIG. 1M shows a schematic cross-sectional view of a wound battery core 10XIII according to another embodiment of the present application.
  • the difference between the wound cell 10XIII according to another embodiment of the present application and the wound cell 10XII shown in FIG. 1L is that the wound cell 10XIII also includes a seventh insulating layer 700XIII, It is arranged at the corresponding position of the first pole piece 111XIII opposite to the fifth insulating colloid 500XIII and the sixth insulating colloid 600XIII.
  • the fifth insulating colloid 500XIII and the sixth insulating colloid 600XIII can further prevent the short circuit risk caused by the welding burr of the second tab 211XIII from piercing the isolation film, so as to further improve the safety performance.
  • the thickness of the fifth insulating colloid 500XIII, the sixth insulating colloid and the seventh insulating layer 700XIII in the thickness direction X may be smaller than the thickness of the tab.
  • the material of the seventh insulating layer 700XIII may include insulating colloid materials commonly used in the art.
  • the shape of the first portion QXIII defined by the first dividing line 305XIII of the isolation film 300XIII and the fifth end 301XIII of the isolation film 300XIII is a plane.
  • FIG. 1N shows a schematic cross-sectional view of a wound battery core 10XIV according to another embodiment of the present application.
  • the winding cell 10XIV according to another embodiment of the present application differs from the winding cell 10XIII shown in FIG. 1M only in that the second tab 211XIV is located on the left side of the first tab 111XIV. side.
  • the embodiments of the present application also provide an electrochemical device, which includes the wound cell according to any one of the embodiments of the present application.

Abstract

卷绕式电芯（10I）及电化学装置。该卷绕式电芯（10I）包括第一极片（100）、第二极片（200）、隔离膜（300）、由第一极片（100）、第二极片（200）及隔离膜（300）所围封的中心区域（S）及厚度方向（X）。第一极片（100）、第二极片（200）及隔离膜（300）经卷绕以形成卷绕式电芯（10I）。第一极片（100）包括具有第一表面（101a）和与第一表面（101a）相对的第二表面（101b）的第一集流体（101），第一表面（101a）相对于第二表面（101b）更靠近中心区域（S）；具有第一端（103a）和第二端（103b）的第一区段（103），第一端（103a）为第一极片（100）的卷绕起始端；及具有第三端（105a）和第四端（105b）的平面状的第二区段（105），第二区段（105）的第一表面（101a）设置第一极耳（111）。第二极片（200）包括第一侧（211a）设置于第二极片（200）的第二极耳（211）。第一端（103a）、第一极耳（111）和第二极耳（211）在厚度方向（X）上不重叠。该卷绕式电芯及电化学装置具有较高的空间利用率和能量密度。

Description

卷绕式电芯及电化学装置 技术领域
本申请实施例涉及电池领域，特别是涉及卷绕式电芯及电化学装置。
背景技术
电池已广泛应用于各种电子产品以及电动汽车等领域。然而，随着电池商业化的发展，市场对电池的能量密度的要求越来越高。因此，业界需要一种具有较高的能量密度的卷绕式电芯及电化学装置。
发明内容
本申请实施例的目的之一在于提供一种卷绕式电芯及电化学装置，其能够降低卷绕式电芯的厚度，具有较高的能量密度和空间利用率。
根据本申请的一实施例提供的一种卷绕式电芯，其包括第一极片、第二极片及隔离膜，所述隔离膜设置于所述第一极片和所述第二极片之间，所述第一极片、所述第二极片及所述隔离膜经卷绕以形成所述卷绕式电芯；所述卷绕式电芯具有厚度方向和由所述第一极片、所述第二极片及所述隔离膜所围封的中心区域；所述第一极片包括：第一集流体，所述第一集流体包括：第一表面和与所述第一表面相对的第二表面，所述第一表面相对于所述第二表面更靠近所述中心区域；第一区段，所述第一区段具有第一端和第二端，所述第一端为所述第一极片的卷绕起始端；及第二区段，所述第二区段具有第三端和第四端，所述第三端与所述第二端连接；所述第二区段为平面状，所述第二区段的所述第一表面设置有第一极耳；所述第二极片包括：第二极耳，所述第二极耳具有第一侧和与所述第一侧相对的第二侧，所述第一侧设置于所述第二极片；其中，所述第一端、所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
在本申请的一些实施例中，所述隔离膜具有第五端和第六端，所述第五端为所述隔离膜的卷绕起始端，所述第六端为所述隔离膜的卷绕结束端，所 述第五端与所述第一端、所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
在本申请的一些实施例中，所述第六端与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
在本申请的一些实施例中，所述隔离膜具有第一分界线，所述第一分界线至所述第五端构成所述隔离膜的第一部分，所述第一部分的形状为弯曲形或平面形，所述第一部分与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
在本申请的一些实施例中，还包括第一绝缘胶体，其覆盖所述第二极片的卷绕结束端，所述第一绝缘胶体与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
在本申请的一些实施例中，所述第二极片的卷绕结束端与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
在本申请的一些实施例中，所述第一区段的所述第一表面和所述第二表面不设置第一活性物质层；所述第二区段的所述第一表面不设置所述第一活性物质层，所述第二区段的所述第二表面设置有所述第一活性物质层。
在本申请的一些实施例中，所述第一极片还包括：第三区段及第四区段，其中，所述第三区段具有第七端和第八端，所述第七端与所述第四端连接；所述第四区段具有第九端和第十端，所述第九端与所述第八端连接，所述第十端为所述第一极片的卷绕结束端；且其中，所述第三区段的所述第一表面不设置所述第一活性物质层，所述第三区段的所述第二表面设置第一活性物质层，所述第四区段的所述第一表面和所述第二表面设置第一活性物质层。
在本申请的一些实施例中，位于所述第二区段和所述第三区段之间的所述隔离膜具有涂层或不具有涂层。
在本申请的一些实施例中，所述第二极片包括第二集流体，所述第二集流体包括：第三表面和与所述第三表面相对的第四表面，所述第三表面相对于所述第四表面更靠近所述中心区域；所述第二极片还包括：第五区段、第六区段及第七区段，其中，所述第五区段具有第十一端和第十二端，所述第十一端为所述第二极片的卷绕起始端；所述第六区段具有第十三端和第十四 端，所述第十三端与所述第十二端连接；所述第七区段具有第十五端和第十六端，所述第十五端与所述第十四端连接，所述第十六端为所述第二极片的卷绕结束端；且其中，所述第五区段的所述第三表面和所述第四表面设置有第二活性材料层；所述第六区段的所述第三表面设置有所述第二活性材料层；所述第七区段的所述第三表面和所述第四表面不设置所述第二活性材料层。
在本申请的一些实施例中，所述第五区段包括第一节段、第二节段、第三节段、第四节段及第五节段，其中所述第一节段、所述第三节段和所述第五节段为平面状，所述第二节段和所述第四节段为弯曲状，所述第一节段为所述第五区段的开始节段，所述第二节段与所述第一节段相连，所述第三节段与所述第二节段相连，所述第四节段与所述第三节段相连，所述第五节段为所述第五区段的结束节段；所述第六区段包括第六节段、第七节段、第八节段及第九节段，其中所述第六节段和所述第八节段为弯曲状，所述第七节段和所述第九节段为平面状，所述第六节段为所述第六区段的开始节段，所述第七节段与所述第六节段相连，所述第八节段与所述第七节段相连，所述第九节段与所述第八节段相连，所述第九节段为所述第六区段的结束节段；所述第七区段包括第十节段及第十一节段，其中所述第十节段为弯曲状，所述第十一节段为平面状，所述第十节段为所述第七区段的开始节段，所述第十一节段为所述第七区段的结束节段；其中所述第六节段的所述第四表面设置有第二绝缘胶体，所述第二绝缘胶体的起始端和结束端分别与所述第六节段的起始端和结束端重合，所述第六节段的起始端与所述第五区段连接；所述第十节段的所述第三表面设置有第三绝缘胶体，所述第三绝缘胶体的起始端和结束端分别与所述第十节段的起始端和结束端重合，所述第十节段的起始端与所述第六区段连接。
在本申请的一些实施例中，所述第六端超出所述第二绝缘胶体和所述第三绝缘胶体的结束端，或所述第六端与所述第二绝缘胶体和所述第三绝缘胶体的结束端平齐。
在本申请的一些实施例中，所述第二极耳的第一侧设置于所述第十一节段的所述第三表面。
在本申请的一些实施例中，所述第二极耳的第一侧设置于所述第七节段 的所述第四表面。
在本申请的一些实施例中，所述卷绕式电芯进一步包括覆盖所述第二极耳第二侧的第四绝缘胶体。
在本申请的一些实施例中，所述第一绝缘胶体覆盖所述第二极耳的第二侧。
在本申请的一些实施例中，所述第二极耳位于所述第十一节段下方。
在本申请的一些实施例中，其中所述第三节段具有第一部分，所述第一部分的所述第三表面和所述第四表面不设置有所述第二活性物质层，所述第二极耳的第一侧设置于所述第一部分的所述第三表面和所述第四表面中的一者；或，所述第五节段具第二部分，所述第二部分的所述第三表面和所述第四表面不设置有所述第二活性物质层，所述第二极耳的第一侧设置于所述第二部分的所述第三表面和所述第四表面中的一者；所述卷绕式电芯还包括：第五绝缘胶体，其设置于所述第二极耳的第二侧且遮蔽所述第二极耳的第二侧所连接的所述第一部分或所述第二部分的相应表面；及第六绝缘胶体，其与所述第五绝缘胶体相对，且遮蔽所述第一部分中的未与所述第二极耳的第一侧连接的表面或所述第二部分中的未与所述第二极耳的第一侧连接的表面。
在本申请的一些实施例中，还包括第七绝缘层，设置于与所述第五绝缘胶体和所述第六绝缘胶体相对的所述第一极片的相应位置处。
根据本申请的另一实施例提供的一种电化学装置，其包括上述任一实施例所述的卷绕式电芯。
本申请实施例提供的卷绕式电芯及电化学装置具有相较于现有卷绕式电芯更小的厚度，具有较高的能量密度和空间利用率。
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1A示出了根据本申请一实施例的卷绕式电芯的截面示意图；
图1B示出了根据本申请另一实施例的卷绕式电芯的截面示意图；
图1C示出了根据本申请又一实施例的卷绕式电芯的截面示意图；
图1D示出了根据本申请另一实施例的卷绕式电芯的截面示意图；
图1E示出了根据本申请又一实施例的卷绕式电芯的截面示意图；
图1F示出了根据本申请另一实施例的卷绕式电芯的截面示意图；
图1G示出了根据本申请又一实施例的卷绕式电芯的截面示意图；
图1H示出了根据本申请另一实施例的卷绕式电芯的截面示意图；
图1I示出了根据本申请又一实施例的卷绕式电芯的截面示意图；
图1J示出了根据本申请另一实施例的卷绕式电芯的截面示意图；
图1K示出了根据本申请又一实施例的卷绕式电芯的截面示意图；
图1L示出了根据本申请另一实施例的卷绕式电芯的截面示意图；
图1M示出了根据本申请又一实施例的卷绕式电芯的截面示意图；
图1N示出了根据本申请另一实施例的卷绕式电芯的截面示意图。
具体实施方式
本申请的实施例将会被详细的描示在下文中。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：“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示的方向。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。
如本文中所使用，术语“约”、“大致”、“大体上”、“实质”及“相 近”用以描述及说明小的变化。当与事件或情形结合使用时，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％。举例来说，如果两个数值之间的差值小于或等于值的平均值的±10％(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％)，那么可认为两个数值“大体上”相同。
再者，为便于描述，“第一”、“第二”、“第三”等等可在本文中用于区分一个图或一系列图的不同组件。“第一”、“第二”、“第三”等等不意欲描述对应组件。
在本申请中，除非经特别指定或限定之外，“设置”、“连接”、“耦合”、“固定”以及与其类似的用词在使用上是广泛地，而且本领域技术人员可根据具体的情况以理解上述的用词可以是，比如，固定连接、可拆式连接或集成连接；其也可以是机械式连接或电连接；其也可以是直接连接或通过中介结构的间接连接；也可以是两个组件的内部通讯。
在具体实施方式及权利要求书中，由术语“中的一者”、“中的一个”、“中的一种”或其他相似术语所连接的项目的列表可意味着所列项目中的任一者。例如，如果列出项目A及B，那么短语“A及B中的一者”意味着仅A或仅B。在另一实例中，如果列出项目A、B及C，那么短语“A、B及C中的一者”意味着仅A；仅B；或仅C。项目A可包含单个元件或多个元件。项目B可包含单个元件或多个元件。项目C可包含单个元件或多个元件。
在具体实施方式及权利要求书中，由术语“中的至少一者”、“中的至少一个”、“中的至少一种”或其他相似术语所连接的项目的列表可意味着所列项目的任何组合。例如，如果列出项目A及B，那么短语“A及B中的至少一者”意味着仅A；仅B；或A及B。在另一实例中，如果列出项目A、B及C，那么短语“A、B及C中的至少一者”意味着仅A；或仅B；仅C； A及B(排除C)；A及C(排除B)；B及C(排除A)；或A、B及C的全部。项目A可包含单个元件或多个元件。项目B可包含单个元件或多个元件。项目C可包含单个元件或多个元件。
现有技术形成卷绕式电芯时，通常需要空卷内部隔离膜，导致卷绕式电芯内部具有四层隔离膜。因此，现有技术提供的卷绕式电芯具有低的空间利用率。可改善电芯结构内部及隔离膜卷绕工艺，以获得内部仅有两层隔离膜的卷绕式电芯。然而，仅依靠降低卷绕式电芯内部的隔离膜层数来提高电芯的空间利用率，还不足以满足市场对电芯的较高能量密度的需求。因而，业界需要提供更多有效的技术方案以获得具有更高的能量密度和空间利用率的卷绕式电芯。
鉴于以上情况，本申请实施例提供了一种改善的卷绕式电芯和电化学装置，其在卷绕式电芯的中心区域仅具有两层隔离膜的基础上，通过设计位于卷绕式电芯的中心区域的隔离膜与中心区域的极片和/或电芯极耳在电芯的厚度方向上的位置关系，有效地降低电芯厚度，从而提高电芯的空间利用率和能量密度。
图1A示出了根据本申请一实施例的卷绕式电芯10I的截面示意图。如图1A所示，根据本申请一实施例的卷绕式电芯10I包括：第一极片100、第二极片200及隔离膜300。第一极片100、第二极片200及隔离膜300经卷绕以形成卷绕式电芯10I。卷绕式电芯10I具有厚度方向X、与厚度方向垂直的长度方向Y，及由第一极片100、第二极片200及隔离膜300所围封的中心区域S。
第一极片100可包括第一集流体101。第一集流体101的材料可包括本领域中适用于集流体的任意材料。第一集流体101可包括，例如，但不限于，高分子层和/或金属层。第一集流体101可包括第一表面101a和与第一表面101a相对的第二表面101b。第一表面101a相对于第二表面101b更靠近中心区域S。
第一极片100可包括第一区段103、第二区段105、第三区段107及第四区段109。第一区段103、第二区段105、第三区段107及第四区段109中的每一者均可看作为第一集流体101的一部分。第一区段103、第二区段105、 第三区段107及第四区段109共同构成整个第一集流体101。
第一区段103具有第一端103a和第二端103b。第一端103a可为第一区段103的起始端，即，第一极片100的卷绕起始端。第二端103b可为第一区段103的结束端。第一区段103的第一表面101a和第二表面101b可不设置活性物质层。即，第一区段103所限定的第一集流体101的部分可为不涂覆任何活性物质层的集流体。第一区段103可包括弯曲状和/或平面状的集流体。
第二区段105连接至第一区段103。第二区段105具有第三端105a和第四端105b。第三端105a可为第二区段105的起始端，且与第二端103b连接。第四端105b可为第二区段105的结束端。第二区段105可仅包括平面状的集流体。第二区段105的第一表面101a可设置第一极耳111。第一极耳111的材料可包含金属。在某些实施例中，第一极耳111的材料可包含铜。在某些实施例中，第一极耳111的材料可包含镍。在某些实施例中，第一极耳111的材料可包含镍、银或铜的合金材料。在某些实施例中，第一极耳111的材料可包含本领域适用于极耳的任意材料。第一极耳111可通过，例如，但不限于，电阻焊接、超声波焊接、导电胶连接等任意合适的方式连接至第一集流体101的第二区段105的第一表面101a。第一极耳111可为负极极耳。在本申请其它实施例中，第一极耳111可为正极极耳。当第一极耳111位于第一极片100的第二区段105时，卷绕起始端处的隔离膜300无需空卷一圈，因而中心区域S可仅具有两层隔离膜300。第二区段105的第一表面101a可不设置活性物质层，第二区段105的第二表面101b可设置第一活性物质层113。即，第二区段105所限定的第一集流体101的部分可为仅一个表面涂覆活性物质层的集流体。第一活性物质层113可包括本领域常用的任何活性物质层的材料，例如，但不限于，硅碳、导电炭黑(Super P)、粘结剂丁苯橡胶(SBR)、或钴酸锂(LiCoO2)等。
第三区段107连接至第二区段105。第三区段107具有第七端107a和第八端107b。第七端107a可为第三区段107的起始端，且与第四端105b连接。第八端107b可为第三区段107的结束端。第三区段107可包括弯曲状及平面状的集流体。第三区段107的第一表面101a可不设置任何活性物质层。第 三区段107的第二表面101b可设置第一活性物质层113。即，第三区段107所限定的第一集流体101的部分可为仅一个表面涂覆活性物质层的集流体。
第四区段109连接至第三区段107。第四区段109具有第九端109a和第十端109b。第九端109a可为第四区段109的起始端，且与第八端107b连接。第十端109b可为第四区段109的结束端，即，第一极片100的卷绕结束端。第四区段109可包括弯曲状及平面状的集流体。第四区段109的第一表面101a和第二表面101b均可设置第一活性物质层113。即，第四区段109所限定的第一集流体101的部分可为两个表面均涂覆活性物质层的集流体。
第二极片200可包括第二集流体201。第二集流体201的材料可包括本领域中适用于集流体的任意材料。第二集流体201可包括，例如，但不限于，高分子层和/或金属层。第二集流体201可包括第三表面201a和与第三表面201a相对的第四表面201b。第三表面201a相对于第四表面201b更靠近中心区域S。
第二极片200可包括第五区段203、第六区段205及第七区段207。第五区段203、第六区段205及第七区段207中的每一者均可看作为第二集流体201的一部分。第五区段203、第六区段205及第七区段207共同构成整个第二集流体201。
第五区段203具有第十一端203a和第十二端203b。第十一端203a可为第五区段203的起始端，即，第二极片200的卷绕起始端。第十二端203b可为第五区段203的结束端。第五区段203的第三表面201a和第四表面201b可设置第二活性材料层213。即，第五区段203所限定的第二集流体201的部分可为两个表面均涂覆活性物质层的集流体。第二活性材料层213可包括本领域常用的任何活性物质层的材料，例如，但不限于，硅碳、导电炭黑(Super P)、粘结剂丁苯橡胶(SBR)、或钴酸锂(LiCoO2)等。第二活性材料层213和第一活性物质层113的材料可相同或不同。第五区段203可包括弯曲状和/或平面状的集流体。
第五区段203可包括第一节段2031、第二节段2033、第三节段2035、第四节段2037及第五节段2039。第一节段2031、第二节段2033、第三节段2035、第四节段2037及第五节段2039中的每一者均可看作为第五区段203 的一部分。第一节段2031、第二节段2033、第三节段2035、第四节段2037及第五节段2039共同构成整个第五区段203。
第一节段2031可为第五区段203的开始节段。第一节段2031具有起始端2031a和结束端2031b。第一节段2031的起始端2031a与第五区段203的第十一端203a重合。起始端2031a即为第二极片200的卷绕起始端。第一节段2031可为平面状。第二节段2033与第一节段2031相连。第二节段2033具有起始端2033a和结束端2033b。第二节段2033的起始端2033a与第一节段2031的结束端2031b连接。第二节段2033可为弯曲状。第三节段2035与第二节段2033相连。第三节段2035具有起始端2035a和结束端2035b。第三节段2035的起始端2035a与第二节段2033的结束端2033b连接。第三节段2035可为平面状。第四节段2037与第三节段2035相连。第四节段2037具有起始端2037a和结束端2037b。第四节段2037的起始端2037a与第三节段2035的结束端2035b连接。第四节段2037可为弯曲状。第五节段2039与第四节段2037相连。第五节段2039具有起始端2039a和结束端2039b。第五节段2039的起始端2039a与第四节段2037的结束端2037b连接。结束端2039b与第五区段203的结束端203b重合。第五节段2039为第五区段203的结束节段。第五节段2039可为平面状。
第六区段205连接至第五区段203。第六区段205具有第十三端205a和第十四端205b。第十三端205a可为第六区段205的起始端，且与第十二端203b连接。第十四端205b可为第六区段205的结束端。第六区段205的第三表面201a可设置第二活性材料层213。第六区段205的第四表面201b可不设置第二活性材料层213。即，第六区段205所限定的第二集流体201的部分可为仅一个表面涂覆活性物质层的集流体。第六区段205可包括弯曲状和/或平面状的集流体。
第六区段205可包括第六节段2051、第七节段2053、第八节段2055及第九节段2057。第六节段2051、第七节段2053、第八节段2055及第九节段2057中的每一者均可看作为第六区段205的一部分。第六节段2051、第七节段2053、第八节段2055及第九节段2057共同构成整个第六区段205。
第六节段2051可为第六区段205的开始节段。第六节段2051与第五节 段2039相连。第六节段2051具有起始端2051a和结束端2051b。起始端2051a与第五节段2039的结束端2039b连接。第六节段2051的第四表面201b设置第二绝缘胶体215。第二绝缘胶体215具有起始端215a和结束端215b。起始端215a和结束端215b分别与第六节段2051的起始端2051a和结束端2051b重合。第二绝缘胶体215可包括本领域适用于绝缘胶体的任意材料。第六节段2051可为弯曲状。第七节段2053与第六节段2051相连。第七节段2053具有起始端2053a和结束端2053b。第七节段2053的起始端2053a与第六节段2051的结束端2051b连接。第七节段2053可为平面状。第八节段2055与第七节段2053相连。第八节段2055具有起始端2055a和结束端2055b。第八节段2055的起始端2055a与第七节段2053的结束端2053b连接。第八节段2055可为弯曲状。第九节段2057与第八节段2055相连。第九节段2057具有起始端2057a和结束端2057b。第九节段2057的起始端2057a与第八节段2055的结束端2055b连接。结束端2057b与第六区段205的结束端205b重合。第九节段2057为第六区段205的结束节段。第九节段2057可为平面状。
第七区段207连接至第六区段205。第七区段207具有第十五端207a和第十六端207b。第十五端207a可为第七区段207的起始端，且与第十四端205b连接。第十六端207b可为第七区段207的结束端，即，第二极片200的卷绕结束端。第七区段207的第三表面201a和第四表面201b可不设置第二活性材料层213。即，第七区段207所限定的第二集流体201的部分可为不涂覆任何活性物质层的集流体。第七区段207可包括弯曲状及平面状的集流体。第十六端207b可不与第一极耳100、第二极耳200和隔离膜300的第五端301在厚度方向X上重叠，以降低卷绕式电芯10I的厚度。
第七区段207可包括第十节段2071和第十一节段2073。第十节段2071和第十一节段2073均可看作为第七区段207的一部分。第十节段2071和第十一节段2073共同构成整个第七区段207。
第十节段2071可为第七区段207的开始节段。第十节段2071具有起始端2071a和结束端2071b。第十节段2071的起始端2071a与第九节段2057的结束端2057b连接。第十节段2071可为弯曲状。第十节段2071的第三表 面201a设置有第三绝缘胶体217。第三绝缘胶体217可包括本领域常用的绝缘胶体的材料。第三绝缘胶体217具有起始端217a和结束端217b。起始端217a和结束端217b分别与第十节段2071的起始端2071a和结束端2071b重合。第十一节段2073与第十节段2071相连。第十一节段2073具有起始端2073a和结束端2073b。第十一节段2073的起始端2073a与第十节段2071的结束端2071b连接。第十一节段2073为第七区段207的结束节段。第十一节段2073可为平面状。第十一节段2073的第三表面201a设置第二极耳211。第二极耳211具有第一侧211a和与第一侧211a相对的第二侧211b，第一侧211a设置于第二极片200的第十一节段2073的第三表面201a。第二极耳211的材料可包含金属。在某些实施例中，第二极耳211的材料可包含铜。在某些实施例中，第二极耳211的材料可包含镍。在某些实施例中，第二极耳211的材料可包含镍、银或铜的合金材料。在某些实施例中，第二极耳211的材料可包含本领域适用于极耳的任意材料。第二极耳211可通过，例如，但不限于，电阻焊接、超声波焊接、导电胶连接等任意合适的方式连接至第二集流体201的第十一节段2073的第三表面201a。第二极耳211设置于第一极耳111的右侧，且在厚度方向X上与第一极耳111不重叠。第十一节段2073与第一极耳111可在厚度方向X上不重叠。第二极耳211可为正极极耳。在本申请其它实施例中，第二极耳211可为负极极耳。第二极耳211在第一极耳111的右侧。在本申请其它实施例中，第二极耳211可在第一极耳111的左侧。第二极耳211与第一极片100的第一端103a和第一极耳111在厚度方向X上不重叠，以进一步降低卷绕式电芯10I的厚度。
隔离膜300可设置于第一极片100和第二极片200之间。隔离膜300具有第五端301和第六端303。第五端301为隔离膜300的卷绕起始端。第六端303为隔离膜300的卷绕结束端。第五端301在厚度方向X上与第一极耳100重叠。在本申请其它实施例中，第五端301在厚度方向X上与第一极耳100不重叠以进一步降低卷绕式电芯10I的厚度。隔离膜300的第六端303在厚度方向X上与第一极耳111和第二极耳211不重叠。隔离膜300可具有虚拟的第一分界线305。将第一分界线305至第五端301构成隔离膜300的部分定义为隔离膜300的第一部分Q。第一部分Q的形状可为平面形。第一 部分Q在厚度方向X上与第一极耳100重叠。在本申请其它实施例中，第一部分Q可在厚度方向X上与第一极耳100不重叠以进一步降低卷绕式电芯10I的厚度。位于第二区段105和第三区段107之间的隔离膜300可具有涂层以提高卷绕式电芯10I的安全性。在本申请其它实施例中，位于第二区段105和第三区段107之间的隔离膜300可不具有涂层，以降低卷绕式电芯10I的厚度。隔离膜300的材料可包括本领域中适用于隔离膜的任意材料。隔离膜300的第六端303可与第二绝缘胶体215的结束端215b和第三绝缘胶体217的结束端217b平齐，或第六端303超出第二绝缘胶体215的结束端215b和第三绝缘胶体217的结束端217b，以保证卷绕式电芯10I的安全性。
卷绕式电芯10I还可包括第一绝缘胶体400，其覆盖第二极片200的卷绕结束端207b，且将第二极片200固定至卷绕式电芯10I的第七节段2053的第四表面201b上方。第一绝缘胶体400可包括本领域常用的绝缘胶体的材料，例如，但不限于，绝缘胶、聚烯类热熔胶粘剂、乙烯及其共聚物类热熔胶粘剂、聚氨酯类热熔胶粘剂，或聚酰胺类热熔胶粘剂等。第一绝缘胶体400可与第一极耳111和第二极耳211在厚度方向X上不重叠，以有利于厚度空间最大化，进一步提升卷绕式电芯10I的能量密度。
由于第二集流体201的卷绕起始端203a的第三表面201a和第四表面201b均设置第二活性材料层213，因此在本申请的实施例提供的卷绕式电芯10I中，不存在彼此相对的未涂覆活性物质层的两个空白集流体。并且，通过将第一极耳111设置于第一极片100的第二区段105的第一表面101a上，本申请实施例提供的卷绕式电芯10I的第一极耳111在厚度方向X上可与第一极片100的第一端103a不重叠，因而能够降低电芯10的厚度。第一极耳111所处的位置在厚度方向X上的厚度由位于中心区域S的两层隔离膜300、第一极耳111及剩余组件的厚度组成。第二极耳211所处的位置在厚度方向X上的厚度由第二集流体201、第二极耳211及剩余组件的厚度组成。因此，相较于现有的卷绕式电芯，本申请实施例提供的卷绕式电芯10I的厚度能够相对减小，因而具有更高的能量密度和空间利用率。
图1B示出了根据本申请另一实施例的卷绕式电芯10II的截面示意图。如图1B所示，根据本申请另一实施例的卷绕式电芯10II与图1所示的卷绕 式电芯10I的区别仅在于：隔离膜300II的第五端301II与第一极耳111II在厚度方向X上不重叠。
由于隔离膜300II的第五端301II与第一极片100II的第一端103aII、第一极耳111II和第二极耳211II在厚度方向X上不重叠，第一极耳111II所处的位置在厚度方向X上的厚度由第一极耳111及剩余组件的厚度组成。第二极耳211II所处的位置在厚度方向X上的厚度由第二集流体201II、第二极耳211II及剩余组件的厚度组成。因此，本申请实施例提供的卷绕式电芯10II相对于图1A所示的卷绕式电芯10I在厚度方向X上的厚度进一步减小，从而具有更高的能量密度。
图1C示出了根据本申请又一实施例的卷绕式电芯10III的截面示意图。如图1C所示，根据本申请又一实施例的卷绕式电芯10III与图1B所示的卷绕式电芯10II的区别仅在于：由隔离膜300III的第一分界线305III和隔离膜300III的第五端301III界定的第一部分QIII的形状为弯曲形。
图1D示出了根据本申请另一实施例的卷绕式电芯10IV的截面示意图。如图1D所示，根据本申请另一实施例的卷绕式电芯10IV与图1B所示的卷绕式电芯10II的区别仅在于：第二极耳211IV位于第一极耳111IV的左侧。第一绝缘胶体400IV在厚度方向X上与隔离膜300IV的第五端301IV重叠。在本申请其它实施例中，第一绝缘胶体400IV在厚度方向X上可与隔离膜300IV的第五端301IV不重叠，以进一步减少卷绕式电芯10IV的厚度。第一绝缘胶体400IV在厚度方向X上与第一极片100IV的第一端103aIV不重叠。第一极耳111IV所处的位置在厚度方向X上的厚度由第一极耳111IV、第二集流体201IV及剩余组件的厚度组成。第二极耳211IV所处的位置在厚度方向X上的厚度由第二集流体201IV、第二极耳211IV及剩余组件的厚度组成。
图1E示出了根据本申请又一实施例的卷绕式电芯10V的截面示意图。如图1E所示，根据本申请又一实施例的卷绕式电芯10V与图1B所示的卷绕式电芯10II的区别仅在于：第二极耳211V的第一侧211aV设置于第七节段2053V的第四表面201bV。第一极耳111V所处的位置在厚度方向X上的厚度由第一极耳111V及剩余组件的厚度组成。第二极耳211IV所处的位置在厚度方向X上的厚度由第二极耳211V及剩余组件的厚度组成。因此，本 申请实施例提供的卷绕式电芯10V相对于图1A-1D所示的卷绕式电芯在厚度方向X上的厚度可进一步减小，从而具有更高的能量密度。
在本申请其它实施例中，卷绕式电芯10V可进一步包括覆盖第二极耳211V的第二侧211bV的第四绝缘胶体(图中未示出)以防止第二极耳211V刺破卷绕式电芯10V的包装袋，从而避免产生腐蚀。
图1F示出了根据本申请另一实施例的卷绕式电芯10VI的截面示意图。如图1F所示，根据本申请另一实施例的卷绕式电芯10IV与图1E所示的卷绕式电芯10V的区别仅在于：由隔离膜300VI的第一分界线305VI和隔离膜300VI的第五端301VI界定的第一部分QVI的形状为弯曲形。
图1G示出了根据本申请又一实施例的卷绕式电芯10VII的截面示意图。如图1G所示，根据本申请又一实施例的卷绕式电芯10VII与图1E所示的卷绕式电芯10V的区别仅在于：第二极耳211VII位于第一极耳111VII的左侧，第一绝缘胶体400VII在厚度方向X上与第一极耳111VII重叠。第一极耳111VII所处的位置在厚度方向X上的厚度由第一极耳111VII、第一绝缘胶体400VII及剩余组件的厚度组成。第二极耳211VII所处的位置在厚度方向X上的厚度由第二极耳211VII及剩余组件的厚度组成。
在本申请其它实施例中，第一绝缘胶体400VII在厚度方向X上可与第一极耳111VII不重叠。第一极耳111VII所处的位置在厚度方向X上的厚度由第一极耳111VII及剩余组件的厚度组成。第二极耳211VII所处的位置在厚度方向X上的厚度由第二极耳211VII及剩余组件的厚度组成。
图1H示出了根据本申请另一实施例的卷绕式电芯10VIII的截面示意图。如图1H所示，根据本申请另一实施例的卷绕式电芯10VIII与图1G所示的卷绕式电芯10VII的区别仅在于：由隔离膜300VIII的第一分界线305VIII和隔离膜300VIII的第五端301VIII界定的第一部分QVIII的形状为弯曲形。第一部分QVIII的一部分在厚度方向X上与第二极耳211VIII重叠。第一极耳111VIII所处的位置在厚度方向X上的厚度由第一极耳111VIII、第一绝缘胶体400VIII及剩余组件的厚度组成。第二极耳211VIII所处的位置在厚度方向X上的厚度由第二极耳211VIII、两层隔离膜300及剩余组件的厚度组成。
在本申请其它实施例中，第一绝缘胶体400VIII在厚度方向X上可与第一极耳111VIII不重叠，第一部分QVIII在厚度方向X上可与第二极耳211VIII不重叠。第一极耳111VIII所处的位置在厚度方向X上的厚度由第一极耳111VIII及剩余组件的厚度组成。第二极耳211VIII所处的位置在厚度方向X上的厚度由第二极耳211VIII及剩余组件的厚度组成。
图1I示出了根据本申请又一实施例的卷绕式电芯10IX的截面示意图。如图1I所示，根据本申请又一实施例的卷绕式电芯10IX与图1E所示的卷绕式电芯10V的区别仅在于：第一绝缘胶体400IX覆盖第二极耳211IX的第二侧211bIX，以防止第二极耳211IX刺破卷绕式电芯10IX的包装袋，从而避免产生腐蚀。
图1J示出了根据本申请另一实施例的卷绕式电芯10X的截面示意图。如图1J所示，根据本申请另一实施例的卷绕式电芯10X与图1E所示的卷绕式电芯10V的区别仅在于：第二极耳211X位于第十一节段2073X下方。第一极耳111X所处的位置在厚度方向X上的厚度由第一极耳111X及剩余组件的厚度组成。第二极耳211X所处的位置在厚度方向X上的厚度由第二极耳211X、第二集流体201X及剩余组件的厚度组成。
图1K示出了根据本申请又一实施例的卷绕式电芯10XI的截面示意图。如图1K所示，根据本申请又一实施例的卷绕式电芯10XI与图1J所示的卷绕式电芯10X的区别在于：第二极耳211XI的第一侧211aXI位于第三节段2035XI的第一部分2035cXI的第四表面201bXI。第一部分2035cXI的第三表面201aXI和第四表面201bXI均不设置第一或第二活性物质层。卷绕式电芯10XI还包括第五绝缘胶体500XI，其设置于第二极耳211XI的第二侧211bXI且遮蔽第二极耳211XI的第一侧211aXI所连接的第一部分2035cXI的表面，以防止第二极耳211XI的焊接毛刺刺破隔离膜300而带来的短路风险。卷绕式电芯10XI还可包括第六绝缘胶体600XII，其与第五绝缘胶体500XII相对，且遮蔽第一部分中的未与第二极耳211XI的第一侧211aXI连接的表面，以防止第二极耳211XI的焊接毛刺刺破隔离膜300XI而带来的短路风险。第五绝缘胶体500XI和第六绝缘胶体600XI的材料可包括本领域常用的绝缘胶体的材料。
在本申请其它实施例中，第二极耳211XI的第一侧211aXI可位于第五节段2039XI的第二部分的第四表面201bXI。第五节段2039XI的第二部分类似于第一部分2035cXI，其第三表面201aXI和第四表面201bXI均不设置活性物质层，并且第五绝缘胶体500XI设置于第二极耳211XI的第二侧211bXI且遮蔽第二极耳211XI的第二侧211bXI所连接的第二部分的表面，第六绝缘胶体600XI与第五绝缘胶体500XI相对，且遮蔽第二部分中的未与第二极耳211XI的第一侧211aXI连接的表面。
图1L示出了根据本申请另一实施例的卷绕式电芯10XII的截面示意图。如图1L所示，根据本申请另一实施例的卷绕式电芯10XII与图1K所示的卷绕式电芯10XI的区别仅在于：第二极耳211XII的第一侧211aXII位于第三节段2035XII的第一部分2035cXII的第三表面201aXII。第一部分2035cXII的第三表面201aXII和第四表面201bXII均不设置活性物质层。卷绕式电芯10XII还包括第五绝缘胶体500XII，其设置于第二极耳211XII的第二侧211bXII且遮蔽第二极耳211XII的第二侧211bXII所连接的第一部分2035cXII的表面。卷绕式电芯10XII还可包括第六绝缘胶体600XII，其与第五绝缘胶体500XII相对，且设置于第一部分2035cXII中的未与第二极耳211XII的第一侧211aXII连接的表面。由隔离膜300XII的第一分界线305XII和隔离膜300XII的第五端301XII界定的第一部分QXII的形状为弯曲形。
在本申请其他实施例中，第二极耳211XII的第一侧211aXII可位于第五节段2039XII的第二部分的第三表面201aXII。第五节段2039XII的第二部分类似于第一部分2035cXII，其第三表面201aXII和第四表面201bXII均不设置活性物质层。第五绝缘胶体500XII设置于第二极耳211XII的第二侧211bXII且遮蔽第二极耳211XII的第二侧211bXII所连接的第二部分的表面。第六绝缘胶体600XII与第五绝缘胶体500XII相对，且遮蔽第二部分中的未与第二极耳211XII的第一侧211aXII连接的表面，以防止第二极耳211XII的焊接毛刺刺破隔离膜300XII而带来的短路风险。
图1M示出了根据本申请又一实施例的卷绕式电芯10XIII的截面示意图。如图1M所示，根据本申请又一实施例的卷绕式电芯10XIII与图1L所示的卷绕式电芯10XII的区别在于：卷绕式电芯10XIII还包括第七绝缘层700XIII， 其设置于与第五绝缘胶体500XIII和第六绝缘胶体600XIII相对的第一极片111XIII的相应位置处。第五绝缘胶体500XIII和第六绝缘胶体600XIII可进一步防止第二极耳211XIII的焊接毛刺刺破隔离膜带来的短路风险，以进一步提高安全性能。第五绝缘胶体500XIII、第六绝缘胶体及第七绝缘层700XIII在厚度方向X上的厚度可小于极耳的厚度。第七绝缘层700XIII的材料可包括本领域常用的绝缘胶体的材料。由隔离膜300XIII的第一分界线305XIII和隔离膜300XIII的第五端301XIII界定的第一部分QXIII的形状为平面形。
图1N示出了根据本申请另一实施例的卷绕式电芯10XIV的截面示意图。如图1N所示，根据本申请又一实施例的卷绕式电芯10XIV与图1M所示的卷绕式电芯10XIII的区别仅在于：第二极耳211XIV位于第一极耳111XIV的左侧。
本申请实施例还提供一种电化学装置，其包括根据本申请实施例任一项所述的卷绕式电芯。
本申请的技术内容及技术特点已揭示如上，然而熟悉本领域的技术人员仍可能基于本申请的教示及揭示而作种种不背离本申请精神的替换及修饰。因此，本申请的保护范围应不限于实施例所揭示的内容，而应包括各种不背离本申请的替换及修饰，并为本申请的权利要求书所涵盖。

Claims (20)

  1. 一种卷绕式电芯，包括：
    第一极片、第二极片及隔离膜，所述隔离膜设置于所述第一极片和所述第二极片之间，所述第一极片、所述第二极片及所述隔离膜经卷绕以形成所述卷绕式电芯；所述卷绕式电芯具有厚度方向和由所述第一极片、所述第二极片及所述隔离膜所围封的中心区域；
    所述第一极片包括：
    第一集流体，所述第一集流体包括：第一表面和与所述第一表面相对的第二表面，所述第一表面相对于所述第二表面更靠近所述中心区域；
    第一区段，所述第一区段具有第一端和第二端，所述第一端为所述第一极片的卷绕起始端；及
    第二区段，所述第二区段具有第三端和第四端，所述第三端与所述第二端连接；所述第二区段为平面状，所述第二区段的所述第一表面设置有第一极耳；
    所述第二极片包括：
    第二极耳，所述第二极耳具有第一侧和与所述第一侧相对的第二侧，所述第一侧设置于所述第二极片；
    其中，所述第一端、所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
  2. 根据权利要求1所述的卷绕式电芯，其中所述隔离膜具有第五端和第六端，所述第五端为所述隔离膜的卷绕起始端，所述第六端为所述隔离膜的卷绕结束端，所述第五端与所述第一端、所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
  3. 根据权利要求2所述的卷绕式电芯，其中所述第六端与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
  4. 根据权利要求2所述的卷绕式电芯，其中所述隔离膜具有第一分界线，所述第一分界线至所述第五端构成所述隔离膜的第一部分，所述第一部分的形状为弯 曲形或平面形，所述第一部分与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
  5. 根据权利要求1所述的卷绕式电芯，还包括第一绝缘胶体，其覆盖所述第二极片的卷绕结束端，所述第一绝缘胶体与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
  6. 根据权利要求1所述的卷绕式电芯，其中所述第二极片的卷绕结束端与所述第一极耳和所述第二极耳在所述厚度方向上不重叠。
  7. 根据权利要求1所述的卷绕式电芯，其中所述第一区段的所述第一表面和所述第二表面不设置第一活性物质层；所述第二区段的所述第一表面不设置所述第一活性物质层，所述第二区段的所述第二表面设置有所述第一活性物质层。
  8. 根据权利要求1所述的卷绕式电芯，其中所述第一极片还包括：第三区段及第四区段，其中，
    所述第三区段具有第七端和第八端，所述第七端与所述第四端连接；
    所述第四区段具有第九端和第十端，所述第九端与所述第八端连接，所述第十端为所述第一极片的卷绕结束端；且
    其中，所述第三区段的所述第一表面不设置所述第一活性物质层，所述第三区段的所述第二表面设置第一活性物质层，所述第四区段的所述第一表面和所述第二表面设置第一活性物质层。
  9. 根据权利要求8所述的卷绕式电芯，其中位于所述第二区段和所述第三区段之间的所述隔离膜具有涂层或不具有涂层。
  10. 根据权利要求2所述的卷绕式电芯，所述第二极片包括第二集流体，所述第二集流体包括：第三表面和与所述第三表面相对的第四表面，所述第三表面相对于所述第四表面更靠近所述中心区域；所述第二极片还包括：
    第五区段、第六区段及第七区段，其中，
    所述第五区段具有第十一端和第十二端，所述第十一端为所述第二极片的卷绕起 始端；
    所述第六区段具有第十三端和第十四端，所述第十三端与所述第十二端连接；所述第七区段具有第十五端和第十六端，所述第十五端与所述第十四端连接，所述第十六端为所述第二极片的卷绕结束端；且
    其中，所述第五区段的所述第三表面和所述第四表面设置有第二活性材料层；所述第六区段的所述第三表面设置有所述第二活性材料层；所述第七区段的所述第三表面和所述第四表面不设置所述第二活性材料层。
  11. 根据权利要求10所述的卷绕式电芯，其中，
    所述第五区段包括第一节段、第二节段、第三节段、第四节段及第五节段，其中所述第一节段、所述第三节段和所述第五节段为平面状，所述第二节段和所述第四节段为弯曲状，所述第一节段为所述第五区段的开始节段，所述第二节段与所述第一节段相连，所述第三节段与所述第二节段相连，所述第四节段与所述第三节段相连，所述第五节段为所述第五区段的结束节段；
    所述第六区段包括第六节段、第七节段、第八节段及第九节段，其中所述第六节段和所述第八节段为弯曲状，所述第七节段和所述第九节段为平面状，所述第六节段为所述第六区段的开始节段，所述第七节段与所述第六节段相连，所述第八节段与所述第七节段相连，所述第九节段与所述第八节段相连，所述第九节段为所述第六区段的结束节段；
    所述第七区段包括第十节段及第十一节段，其中所述第十节段为弯曲状，所述第十一节段为平面状，所述第十节段为所述第七区段的开始节段，所述第十一节段为所述第七区段的结束节段；
    其中所述第六节段的所述第四表面设置有第二绝缘胶体，所述第二绝缘胶体的起始端和结束端分别与所述第六节段的起始端和结束端重合，所述第六节段的起始端与所述第五区段连接；所述第十节段的所述第三表面设置有第三绝缘胶体，所述第三绝缘胶体的起始端和结束端分别与所述第十节段的起始端和结束端重合，所述第十节段的起始端与所述第六区段连接。
  12. 根据权利要求11所述的卷绕式电芯，其中所述第六端超出所述第二绝缘胶体和所述第三绝缘胶体的结束端，或所述第六端与所述第二绝缘胶体和所述第三 绝缘胶体的结束端平齐。
  13. 根据权利要求11所述的卷绕式电芯，其中所述第二极耳的第一侧设置于所述第十一节段的所述第三表面。
  14. 根据权利要求11所述的卷绕式电芯，其中所述第二极耳的第一侧设置于所述第七节段的所述第四表面。
  15. 根据权利要求14所述的卷绕式电芯，其中所述卷绕式电芯进一步包括覆盖所述第二极耳第二侧的第四绝缘胶体。
  16. 根据权利要求14所述的卷绕式电芯，其中所述第一绝缘胶体覆盖所述第二极耳的第二侧。
  17. 根据权利要求14所述的卷绕式电芯，其中所述第二极耳位于所述第十一节段下方。
  18. 根据权利要求11所述的卷绕式电芯，其中所述第三节段具有第一部分，所述第一部分的所述第三表面和所述第四表面不设置有所述第二活性物质层，所述第二极耳的第一侧设置于所述第一部分的所述第三表面和所述第四表面中的一者；或，所述第五节段具第二部分，所述第二部分的所述第三表面和所述第四表面不设置有所述第二活性物质层，所述第二极耳的第一侧设置于所述第二部分的所述第三表面和所述第四表面中的一者；所述卷绕式电芯还包括：
    第五绝缘胶体，其设置于所述第二极耳的第二侧且遮蔽所述第二极耳的第二侧所连接的所述第一部分或所述第二部分的相应表面；及
    第六绝缘胶体，其与所述第五绝缘胶体相对，且遮蔽所述第一部分中的未与所述第二极耳的第一侧连接的表面或所述第二部分中的未与所述第二极耳的第一侧连接的表面。
  19. 根据权利要求18所述的卷绕式电芯，还包括第七绝缘层，设置于与所述第五绝缘胶体和所述第六绝缘胶体相对的所述第一极片的相应位置处。
  20. 一种电化学装置，包括权利要求1-19中任一项所述的卷绕式电芯。
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102157752A (zh) * 2011-03-16 2011-08-17 宁德新能源科技有限公司 具有散热性能的动力型锂离子电池
CN106025377A (zh) * 2016-08-01 2016-10-12 东莞新能源科技有限公司 一种卷绕式电芯
CN205828578U (zh) * 2016-07-08 2016-12-21 宁德新能源科技有限公司 二次电池卷绕式电芯
CN205828556U (zh) * 2016-07-08 2016-12-21 宁德新能源科技有限公司 二次电池卷绕式电芯
CN208444906U (zh) * 2018-04-23 2019-01-29 宁德新能源科技有限公司 电芯以及电化学装置
CN110808377A (zh) * 2018-08-06 2020-02-18 宁德新能源科技有限公司 电芯、电池以及电子设备

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN206697567U (zh) * 2017-03-31 2017-12-01 宁德新能源科技有限公司 卷绕式电芯

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102157752A (zh) * 2011-03-16 2011-08-17 宁德新能源科技有限公司 具有散热性能的动力型锂离子电池
CN205828578U (zh) * 2016-07-08 2016-12-21 宁德新能源科技有限公司 二次电池卷绕式电芯
CN205828556U (zh) * 2016-07-08 2016-12-21 宁德新能源科技有限公司 二次电池卷绕式电芯
CN106025377A (zh) * 2016-08-01 2016-10-12 东莞新能源科技有限公司 一种卷绕式电芯
CN208444906U (zh) * 2018-04-23 2019-01-29 宁德新能源科技有限公司 电芯以及电化学装置
CN110808377A (zh) * 2018-08-06 2020-02-18 宁德新能源科技有限公司 电芯、电池以及电子设备

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