WO2024055733A1 - 一种卷芯及电池 - Google Patents

一种卷芯及电池 Download PDF

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Publication number
WO2024055733A1
WO2024055733A1 PCT/CN2023/106640 CN2023106640W WO2024055733A1 WO 2024055733 A1 WO2024055733 A1 WO 2024055733A1 CN 2023106640 W CN2023106640 W CN 2023106640W WO 2024055733 A1 WO2024055733 A1 WO 2024055733A1
Authority
WO
WIPO (PCT)
Prior art keywords
negative electrode
electrode sheet
active material
layer
material layer
Prior art date
Application number
PCT/CN2023/106640
Other languages
English (en)
French (fr)
Inventor
张保海
彭冲
李俊义
Original Assignee
珠海冠宇电池股份有限公司
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
Priority claimed from CN202222450151.XU external-priority patent/CN218039281U/zh
Priority claimed from CN202222650473.9U external-priority patent/CN218783051U/zh
Application filed by 珠海冠宇电池股份有限公司 filed Critical 珠海冠宇电池股份有限公司
Priority to CN202380012612.XA priority Critical patent/CN117678102A/zh
Priority to EP23825593.9A priority patent/EP4369466A1/en
Priority to US18/400,357 priority patent/US20240145757A1/en
Publication of WO2024055733A1 publication Critical patent/WO2024055733A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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

Definitions

  • the present application relates to the field of battery technology, and in particular to a winding core and a battery.
  • Lithium-ion batteries are widely used in people's daily life. Among them, lithium-ion batteries have the characteristics of high specific energy, low self-discharge, long cycle life and no pollution to the environment. With the rapid development of lithium-ion battery technology, people Higher requirements have been put forward for the energy density, fast charging capability and charge and discharge rate of lithium-ion batteries.
  • the conventional wound lithium-ion battery structure cannot meet the demand for fast charging, so the position of the tab needs to be moved to 3/4, 1/3 or 1/2 of the positive and negative electrode sheets. position, in order to prevent lithium deposition at the edges, the positive electrode sheet needs to be cut so that the negative electrode sheet covers the positive electrode sheet, resulting in a gap in the core at this position, causing the inner ring of the core to be uneven, and thus making the battery less effective.
  • the present application provides a rolling core and a battery to solve the problem in the prior art that the battery has poor performance due to the uneven inner ring of the rolling core.
  • the present application provides a winding core, which is characterized in that it includes: a positive electrode sheet, the positive electrode sheet has a positive electrode sheet remover, and the positive electrode sheet remover is a roll of the positive electrode sheet on the winding core.
  • the negative electrode piece, the negative electrode piece includes a negative electrode current collector, a negative electrode active material layer and a gap filler;
  • the negative electrode current collector includes opposite first and second sides, and at least one side of the first side and the second side is provided with the negative electrode Active material layer;
  • the gap filler is disposed on one of the first side and the second side at a position corresponding to the winding starting end of the winding core, and the gap filler fills the positive electrode sheet and the gap between the negative electrode sheet and the negative electrode sheet at the starting end of the winding core.
  • the length of the negative active material layer on the first side in the direction in which the negative current collector extends is greater than the length of the negative active material layer on the second side in the direction in which the negative current collector extends.
  • the length of the negative electrode current collector is greater than the length of the negative electrode active material layer on the first side.
  • the gap filling body is provided on the first side, and at least part of the gap filling body is fixed to the negative active material layer.
  • the first end of the gap filler is flush with the first end of the negative active material layer on the first side, and the first end of the negative active material layer on the first side is One end of the negative active material layer is close to the winding starting end of the winding core, and the first end of the gap filling body is an end of the gap filling body close to the tail of the negative current collector.
  • a part of the gap filling body is fixed to the negative electrode active material layer, and the other part is fixed to the negative electrode current collector.
  • the gap filling body is provided on the second side, and the length of the negative electrode current collector is greater than the length of the negative electrode active material layer provided on the second side, and the gap filling body is connected to the gap filling body.
  • the negative electrode current collector is fixed.
  • the first end of the negative active material layer on the first side is opposite to the center of the first end and the second end of the gap filling body;
  • the first end is an end of the negative active material layer close to the winding starting end of the winding core, the first end of the gap filling body is an end close to the tail of the negative current collector, and the first end of the gap filling body is The second end is an end away from the tail of the negative electrode current collector.
  • the first end of the negative electrode active material layer on the first side is flush with the first end of the gap filler; or, the first end of the negative electrode active material layer is flush with the second end of the gap filler; the first end of the negative electrode active material layer on the first side is an end of the negative electrode active material layer close to the winding start end of the winding core, and the first end of the gap filler is close to the winding start end of the winding core.
  • the second end of the gap filler is an end of the tail of the negative electrode current collector, and the second end of the gap filler is an end away from the tail of the negative electrode current collector.
  • the gap filling body is adhesive tape.
  • the adhesive tape has a through-hole structure.
  • the adhesive layer includes an insulating layer and a glue layer, the glue layer is fixed to the negative electrode sheet, and the insulating layer is located on a side of the glue layer away from the negative electrode sheet.
  • the thickness value of the glue layer is greater than or equal to 2 ⁇ m, and the thickness value of the glue layer is less than or equal to the first preset value; and/or the thickness value of the insulation layer is greater than or equal to 2 ⁇ m, and the thickness value of the insulation layer is greater than or equal to 2 ⁇ m.
  • the thickness value of the layer is less than or equal to the first preset value; the first preset value is greater than or equal to half the thickness value of the positive electrode sheet minus 10 ⁇ m, and the first preset value is less than or equal to the positive electrode sheet removal paste. Half the thickness value of the paste minus 4 ⁇ m.
  • the thickness of the adhesive tape is 0.52-0.55 times the thickness of the positive electrode sheet.
  • the length of the glue along the extension direction of the negative electrode sheet is 1.8-2.2 times the length of the positive electrode sheet after the paste is removed.
  • the gap filling body is a paste layer, and the paste layer is provided with protrusions in a direction perpendicular to the negative active material layer.
  • the paste layer and the negative electrode active material layer disposed on the first side are an integrated structure; or the negative electrode active material layer and the paste layer are combined into a double-layer structure.
  • the paste layer includes at least one of artificial graphite, natural graphite, mesophase carbon microspheres, soft carbon, hard carbon and organic polymer compound carbon.
  • the length of the paste layer along the extension direction of the negative electrode sheet is the same as the length of the positive electrode sheet after the paste is removed.
  • the height of the protrusions of the paste layer is 1.03-1.08 times the thickness of the positive electrode sheet.
  • the paste layer includes at least one of pressure-sensitive adhesive, ceramic and polymer layers.
  • the polymer layer includes at least one of polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyimide and polyurethane, and/or; the pressure-sensitive
  • the glue includes at least one of rubber, silicone, acrylate and polyurethane.
  • This application also provides a battery, including the winding core described in the first aspect of this application.
  • the positive electrode sheet in order to prevent edge lithium deposition in related technologies, the positive electrode sheet will be cut.
  • the cut negative electrode sheet will cover the positive electrode sheet, leaving a gap in the battery core at this position, causing the inner ring of the core to be uneven.
  • the negative electrode sheet in the embodiment of the present application includes a gap filler, and the gap filler is disposed at The gap filler can fill the gap between the positive electrode sheet and the negative electrode sheet at the winding starting end of the battery winding core at one end of one of the first side and the second side that is close to the winding start end of the battery winding core, thereby reducing the The bulges and unevenness of the gap filler caused by bending; improve the flatness of the inner ring of the battery core, reduce the expansion deformation caused by uneven force during the cyclic expansion process of the battery, and also reduce the edge analysis. Capacity fading and battery failure caused by lithium improve the performance of the battery.
  • Figure 1 is a schematic structural diagram of a rolled battery in the related art
  • Figure 2a is one of the structural schematic diagrams of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue;
  • Figure 2b is a schematic structural diagram of the negative electrode sheet shown in Figure 2a in a wound state
  • Figure 3 is the second structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue
  • Figure 4 is the third structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue
  • Figure 5a is the fourth structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue
  • Figure 5b is a schematic structural diagram of the negative electrode sheet shown in Figure 5a in a rolled state
  • Figure 6 is a fifth structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue;
  • Figure 7 is a schematic structural diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue. six;
  • Figure 8 is the seventh structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is glue
  • Figure 9 is the eighth structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is a paste layer;
  • Figure 10 is a ninth structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is a paste layer;
  • Figure 11 is a tenth structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is a paste layer;
  • Figure 12 is an eleventh structural schematic diagram of the negative electrode sheet when the gap filler provided by the embodiment of the present application is a paste layer;
  • FIG. 13 is a twelfth structural schematic diagram of the negative electrode sheet when the gap filling body is a paste layer provided by the embodiment of the present application.
  • first”, “second”, etc. in the embodiments of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.
  • the terms “including” and “having” and any variations thereof are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus that encompasses a series of steps or units and need not be limited to those explicitly listed. Those steps or elements may instead include other steps or elements not expressly listed or inherent to the process, method, product or apparatus.
  • the winding core of the first aspect of the application includes a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet can be wound To form a roll core, it can be understood that there is a separator between the positive electrode sheet and the negative electrode sheet.
  • the positive electrode sheet has a positive electrode sheet remover.
  • the positive electrode sheet remover paste is the end of the positive electrode sheet close to the center of the roll core.
  • the gap between the positive electrode sheet and the negative electrode sheet is close to the center of the battery roll core.
  • the degreased part of the positive electrode sheet is the missing part of the positive electrode sheet at the starting end of the winding core compared to the negative electrode sheet.
  • the winding starting end here refers to the starting position of the winding core during the winding process, and is also the center line of the winding core in the thickness direction.
  • the end along the horizontal direction is also the innermost end of the positive and negative electrode sheets.
  • the negative electrode sheet includes a negative electrode current collector 10, a negative electrode active material layer 20 and a gap filler 30;
  • the negative electrode current collector 10 includes opposite first and second sides, and the first side and the third side At least one side of the two sides is provided with a negative active material layer 20;
  • a gap filler 30 is provided at an end of one of the first and second sides close to the center of the battery core, and the gap filler 30 is used for Fill up the gap between the positive electrode sheet and the end of the negative electrode sheet close to the center of the battery core.
  • the negative electrode sheet includes a negative electrode current collector 10, a negative electrode active material layer 20 and a gap filler 30.
  • the gap filler 30 is disposed on one of the first side and the second side and is close to the battery. At one end of the center of the roll core, the gap filler 30 can fill the gap between the positive electrode sheet and the end of the negative electrode sheet close to the center of the battery roll core, thereby improving the flatness of the battery in the inner ring of the roll core and reducing the battery's cyclic expansion process. On the other hand, it also reduces the capacity attenuation and battery failure caused by edge lithium precipitation, thereby improving the use effect of the battery.
  • the gap filler 30 is an adhesive paste 30 .
  • the negative electrode current collector 10 includes opposite first and second sides, and at least one side of the first side and the second side is provided with a negative active material layer 20; the adhesive tape 30 has a through-hole structure; the adhesive tape 30 The adhesive tape 30 is disposed on one end of one of the first side and the second side and is close to the center of the battery roll core. The adhesive tape 30 is used to fill up the gap between the positive electrode sheet and the negative electrode sheet near the center of the battery roll core. gap.
  • the negative electrode sheet includes a negative electrode current collector 10, a negative electrode active material layer 20 and an adhesive tape 30.
  • the adhesive tape 30 is disposed on one of the first side and the second side, and The adhesive tape 30 can fill the gap between the positive electrode sheet and the negative electrode sheet near the center of the battery core, thereby improving the flatness of the battery in the inner circle of the battery core and reducing the cycle time of the battery.
  • the expansion deformation caused by uneven stress during the expansion process also reduces the capacity attenuation and battery failure caused by edge lithium precipitation, thereby improving the battery's use effect.
  • the adhesive tape 30 can also have the above-mentioned through-hole structure.
  • the adhesive tape 30 can be arranged through the above-mentioned through-hole structure. , to a certain extent, the impact on the internal reaction or process of the battery is reduced.
  • the setting of the above-mentioned through-hole structure can reduce the impact of the adhesive tape 30 due to bending. convex or uneven.
  • the position of the above-mentioned through hole structure on the adhesive tape 30 can be determined based on the position of the adhesive tape 30 on the negative electrode current collector 10 or the negative electrode active material layer 20, as shown in FIG.
  • the above-mentioned through-hole structure is arranged on the left side of the adhesive tape 30 in the direction shown in Figure 2a.
  • the above-mentioned through-hole structure is arranged on the left side of the adhesive tape 30 in the direction shown in Figure 2a.
  • Post 30 in the center is the center.
  • the above-mentioned through-hole structure can be added according to user needs.
  • the adhesive tape 30 is not provided with the above-mentioned through-hole structure, the flatness of the battery in the inner ring of the winding core can still be improved and the battery can be reduced in the cycle.
  • the expansion deformation caused by uneven force during the expansion process will not be described again in the embodiments of the present application.
  • the adhesive tape 30 may be arranged on the first side or the second side. After the adhesive tape 30 is arranged on both sides of the negative active material layer 20, it can be effectively filled by winding. The gap in the inner ring of the core can reduce the possibility of lithium precipitation at the edge of the battery.
  • the adhesive tape 30 can be directly fixed to the negative electrode current collector 10 , or a part of the adhesive tape 30 can be fixed to the negative electrode current collector 10 , and the other part of the adhesive tape 30 can be fixed to the negative electrode active material layer 20 .
  • the adhesive tape 30 is disposed on the longer side of the two sides where the negative active material layer 20 extends along the direction in which the negative electrode current collector 10 extends, a part of the adhesive tape 30 may be attached and fixed to the negative electrode current collector 10 , and the other part may be attached to the negative electrode current collector 10 . A part of the negative electrode active material layer 20 is adhered and fixed. After the negative electrode sheet is matched with the positive electrode and rolled, the adhesive tape 30 can improve the flatness of the battery at the inner ring of the winding core.
  • the adhesive tape 30 can be completely attached and fixed to the negative electrode current collector 10. After the above-mentioned negative electrode sheet is matched with the positive electrode and rolled, the adhesive tape 30 can still improve the flatness of the battery at the inner ring of the winding core.
  • the length and thickness of the adhesive tape 30 can be set according to the structural size of the battery at the inner ring of the winding core, or can be set according to the size of the positive electrode sheet in the battery to remove the paste.
  • the positive electrode sheet removes the paste as The end of the positive electrode sheet close to the center of the battery roll core is missing from the above-mentioned negative electrode sheet, which is not limited in the embodiments of the present application.
  • the length of the negative active material layer 20 on the first side along the extension direction of the negative current collector 10 is longer than that of the negative electrode.
  • the adhesive tape 30 When the adhesive tape 30 is provided on one side of the first side, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 provided on the first side, a part of the adhesive tape 30 is in contact with the negative electrode active material. The layer 20 is fixed, and the other part of the adhesive tape 30 is fixed to the negative electrode current collector 10;
  • the adhesive tape 30 When the adhesive tape 30 is disposed on one side of the second side, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 provided on the first side, the adhesive tape 30 is fixed to the negative electrode current collector 10 .
  • the length of the negative active material layer 20 on the first side along the direction in which the negative current collector 10 extends is greater than the length of the negative active material layer 20 on the second side in the direction in which the negative current collector 10 extends.
  • the arrangement method and position of the adhesive tape 30 change due to the different lengths of the negative active material layer 20 on both sides.
  • the limitation of the setting position can also meet the need to improve the flatness of the inner ring of the winding core, thereby improving the use effect of the battery.
  • the rolled adhesive tape 30 when the adhesive tape 30 is disposed on the first side, the rolled adhesive tape 30 will be located outside the tail of the negative electrode current collector 10 .
  • the adhesive tape 30 is arranged on the second side, the rolled adhesive tape 30 is disposed on the second side.
  • the wound adhesive tape 30 will be located inside the tail of the negative electrode current collector 10 .
  • the adhesive tape 30 is provided on one side of the second side, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 provided on the first side,
  • the adhesive tape 30 is fixed to the negative electrode current collector 10 , wherein the first end of the negative active material layer 20 takes the negative electrode current collector 10 as the axis of symmetry, and is symmetrical to the first side at a position between the first end of the adhesive tape 30 and the adhesive tape. 30 the center of the second end;
  • the negative active material layer 20 on the first side is at one end close to the center of the battery core. is the first end of the negative active material layer 20 , the first end of the adhesive tape 30 is the end of the adhesive tape 30 close to the tail of the negative electrode current collector 10 , and the second end of the adhesive tape 30 is close to the negative active material layer. 20 (that is, the end of the adhesive tape 30 away from the tail of the negative electrode current collector 10).
  • the adhesive tape 30 is all attached and fixed to the negative electrode current collector 10 , and the first end of the negative electrode active material layer 20 takes the negative electrode current collector 10 as the axis of symmetry, and is symmetrical to the position of the first side of the adhesive layer 20 .
  • the adhesive tape 30 is located inside the tail of the negative electrode current collector 10, and the adhesive tape 30 is in a double-layered shape, which can effectively average the pressure endured by the pole piece, improve the flatness of the surface of the core, and thereby reduce the size of the core. Expansion and deformation of the core due to uneven stress during the cyclic expansion process.
  • the adhesive tape 30 is provided on one side of the second side, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 provided on the first side, The adhesive tape 30 is fixed to the negative electrode current collector 10 , wherein the first end of the negative active material layer 20 is flush with the first end of the adhesive tape 30 along the extension direction of the negative electrode current collector 10 ;
  • the end of the negative active material layer 20 on the first side close to the center of the battery core is the first end of the negative active material layer 20 , and the first end of the adhesive tape 30 is close to the negative electrode current collector 10 One end of the tail.
  • the entire adhesive tape 30 is attached and fixed to the negative electrode current collector 10 , and the first end of the negative active material layer 20 is flush with the first end of the adhesive tape 30 along the extension direction of the negative electrode current collector 10 .
  • the adhesive tape 30 will play a supporting role in the bent negative electrode current collector 10, but the adhesive tape 30 will not follow the negative electrode current collector 10.
  • the whole adhesive tape 30 will not be deformed.
  • the adhesive tape 30 is in a single layer shape, which can effectively average the pressure borne by the pole piece, improve the flatness of the surface of the core, thereby reducing the pressure of the core. The expansion and deformation of the core caused by uneven stress during the cyclic expansion process.
  • the adhesive tape 30 when the adhesive tape 30 is disposed on one side of the second side, and the length of the negative electrode current collector 10 is greater than the length of the negative electrode active material layer 20 disposed on the first side, the adhesive tape 30 is fixed to the negative electrode current collector 10, wherein the first end of the negative electrode active material layer 20 is flush with the second end of the adhesive tape 30 in the extension direction of the negative electrode current collector 10;
  • the end of the negative active material layer 20 on the first side close to the center of the battery core is the first end of the negative active material layer 20, and the second end of the adhesive tape 30 is close to the negative active material.
  • One end of the material layer 20 that is, the second end of the adhesive tape 30 is the end of the adhesive tape 30 away from the tail of the negative electrode current collector 10).
  • the entire adhesive tape 30 is attached and fixed on the negative electrode current collector 10 , and the first end of the negative active material layer 20 and the second end of the adhesive tape 30 are flush with each other in the direction in which the negative electrode current collector 10 extends.
  • the adhesive tape 30 is placed at the tail of the negative electrode current collector 10 that has been bent, and the entire adhesive tape 30 will not be deformed.
  • the adhesive tape 30 is in the form of a single layer, which can effectively average the pressure borne by the pole piece, improve the flatness of the core surface, thereby reducing the expansion and deformation of the core caused by uneven stress during the cyclic expansion process of the core.
  • the adhesive tape 30 includes an insulation layer and an adhesive layer.
  • the adhesive tape 30 may include a two-layer structure, wherein one layer is the above-mentioned insulating layer, and the other layer is the above-mentioned glue layer.
  • the glue layer is fixed to the negative electrode sheet, and the insulating layer is located on the side of the glue layer away from the negative electrode sheet.
  • the arrangement of the above-mentioned insulating layer can reduce the influence of the adhesive tape 30 on the internal structure of the battery itself.
  • the above-mentioned adhesive layer can improve the stability of the arrangement of the adhesive tape 30 and reduce the possibility of the adhesive tape 30 falling off. Through the arrangement of this structure , while maintaining the fixed stability of the adhesive tape 30, it can also reduce the impact on the normal operation of the battery.
  • the thickness of the above-mentioned insulating layer and the thickness of the above-mentioned glue layer can be set according to the thickness of the positive electrode sheet in the battery, and the lengths of the above-mentioned insulating layer and the above-mentioned glue layer along the length direction of the electrode sheet can be set according to The positive electrode sheet is set by removing the paste, which is not limited in the embodiment of the present application.
  • the above-mentioned insulating layer may be made of an insulating material suitable for the battery, such as a polymer layer, in which one insulating material may be selected, or a plurality of insulating materials may be selected and mixed.
  • the above-mentioned glue layer can also be made of a colloidal material suitable for the battery, such as rubber and silicone. Suitable colloidal materials can reduce the possibility of falling off in the internal environment of the battery, and the above-mentioned glue layer can be selected from A kind of colloidal material, or multiple colloidal materials can be selected to be mixed and manufactured. It is understood that the embodiments of the present application do not limit the material selection of the above-mentioned insulating layer and the above-mentioned adhesive layer.
  • the thickness value of the glue layer is greater than or equal to 2 ⁇ m, and the thickness value of the glue layer is less than or equal to the first preset value;
  • the first preset value is greater than or equal to half of the thickness of the positive electrode sheet minus 10 ⁇ m, and the first preset value is less than or equal to half of the thickness of the positive electrode sheet minus 4 ⁇ m.
  • the positive electrode sheet of the paste is The end of the positive electrode sheet close to the center of the battery core is the missing part compared to the negative electrode sheet.
  • the thickness of the above-mentioned glue layer needs to be set between 2 ⁇ m and the above-mentioned first preset value.
  • the thickness of the above-mentioned glue layer may be selected between 2 ⁇ m and the positive electrode sheet.
  • the thickness of the above-mentioned adhesive layer can be selected to be half of the thickness value of the positive electrode sheet minus 10 ⁇ m and the thickness of the positive electrode sheet minus 10 ⁇ m.
  • the thickness of the paste is between half and minus 4 ⁇ m. This is only an example and is not a limitation.
  • the thickness of the insulating layer can be determined according to the thickness relationship between the two and the thickness of the adhesive layer, and there is no need to limit and calculate the thickness of the insulating layer.
  • the thickness value of the insulating layer is greater than or equal to 2 ⁇ m, and the thickness value of the insulating layer is less than or equal to the first preset value;
  • the first preset value is greater than or equal to half of the thickness of the positive electrode sheet minus 10 ⁇ m, and the first preset value is less than or equal to half of the thickness of the positive electrode sheet minus 4 ⁇ m.
  • the positive electrode sheet of the paste is The end of the positive electrode sheet close to the center of the battery core is the missing part compared to the negative electrode sheet.
  • the thickness of the above-mentioned insulating layer needs to be set between 2 ⁇ m and the above-mentioned first preset value.
  • the thickness of the above-mentioned insulating layer may be selected between 2 ⁇ m and the positive electrode sheet.
  • the thickness of the above-mentioned insulating layer can be between half of the thickness value of the positive electrode sheet minus 10 ⁇ m.
  • the thickness of the above-mentioned insulating layer may be selected to be half of the thickness value of the positive electrode sheet minus 10 ⁇ m, which is consistent with the positive electrode sheet.
  • the thickness of the paste is between minus 4 ⁇ m. This is only an example and is not limited.
  • the thickness of the adhesive layer can be determined based on the thickness relationship between the two and the thickness of the insulating layer. There is no need to modify the adhesive layer. Thickness is defined and calculated.
  • the insulating layer includes at least one of a polymer layer, textured paper, and glassine paper.
  • the above-mentioned insulating layer is made of one or more of a polymer layer, textured paper, and glassine paper.
  • the polymer layer, textured paper, and glassine paper can be used in electronic components, and Tool It has the characteristics of high temperature resistance, good resistance to chemical solvents, high adhesion, softness and conformability, and no residual glue left after tearing off, which meets the above-mentioned needs of the negative electrode sheet, thus making the adhesive tape 30 suitable for the internal structure of the battery and improving the internal structure of the roll core.
  • the flatness of the circle will improve the battery's use effect.
  • the polymer layer includes at least one of polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyimide and polyurethane.
  • the glue layer includes at least one of rubber, silicone, acrylate and polyurethane.
  • the thickness of the adhesive tape 30 is 0.52-0.55 times the thickness of the positive electrode sheet.
  • the thickness of the adhesive tape 30 is less than or equal to 0.55 times the thickness of the above-mentioned positive electrode sheet, and the thickness of the adhesive tape 30 is greater than or equal to 0.52 times the thickness of the above-mentioned positive electrode sheet.
  • the thickness of the adhesive tape 30 can be 0.53 times the thickness of the above-mentioned positive electrode sheet. times, alternatively, in another feasible implementation, the thickness of the adhesive tape 30 can also be 0.55 times that of the above-mentioned positive electrode sheet. This is only an example and is not limited.
  • the length of the adhesive tape 30 along the extension direction of the negative electrode sheet is 1.8-2.2 times the length of the positive electrode sheet when the paste is removed, and the positive electrode sheet removes paste when the positive electrode sheet is close to the center of the battery core.
  • One end is the missing part compared to the negative electrode piece.
  • the length of the adhesive tape 30 along the extension direction of the negative electrode sheet is greater than or equal to 1.8 times the length of the positive electrode sheet when the paste is removed, and the length of the adhesive tape 30 along the extension direction of the negative electrode sheet is less than or equal to the length of the positive electrode sheet when the positive electrode sheet is removed. 2.2 times the length of the paste.
  • the length of the adhesive tape 30 along the extension direction of the negative electrode sheet can be 1.9 times the length of the positive electrode sheet to remove the paste.
  • the adhesive tape 30 The length of 30 along the extension direction of the negative electrode sheet may be 2.1 times the length of the positive electrode sheet to remove paste. This is only an example and is not limited.
  • the gap filling body 30 is a paste layer 30;
  • the negative electrode current collector 10 includes opposite first and second sides, and the first side and at least one side of the second side is provided with a negative active material layer 20;
  • a paste layer 30 is provided on one end of one of the first side and the second side close to the center of the battery core,
  • the paste layer 30 is provided with protrusions in a direction perpendicular to the negative active material layer 20.
  • the paste layer 30 is used to fill the gap between the positive electrode sheet and the negative electrode sheet close to the center end of the battery core.
  • the above-mentioned negative electrode sheet includes a negative electrode current collector 10, a negative electrode active material layer 20 and a paste layer 30.
  • the paste layer 30 may be disposed on the first side and fixed to the negative electrode active material layer 20.
  • the paste layer 30 is provided with protrusions in a direction perpendicular to the negative active material layer 20 with a certain protrusion height.
  • the paste layer 30 and the negative active material layer 20 are close to the center of the battery core. One end is flush.
  • the paste layer 30 can also be disposed on the second side and fixed to the negative electrode current collector 10. The paste layer 30 can fill up the end of the positive electrode sheet and the negative electrode sheet close to the center of the battery core.
  • the negative electrode active material layer when the negative electrode active material layer is disposed on the first side and the second side, the negative electrode active material layer extends along the direction in which the negative electrode current collector extends on the first side. The length is greater than the length of the negative active material layer on the second side along the extending direction of the negative current collector.
  • the paste layer 30 can be fixed to the negative electrode active material layer 20 as a separate structure.
  • the paste layer 30 can also be fixed to the negative electrode active material layer 20 as an integral structure.
  • the paste layer 30 can fill the gap between the positive electrode sheet and the negative electrode sheet near the center end of the battery core.
  • the paste layer 30 and the negative electrode active material layer 20 are formed as an integral structure, The paste layer 30 can also fill the gap between the positive electrode sheet and the negative electrode sheet close to the center end of the battery core, which is not limited in the embodiment of the present application.
  • the length and thickness of the paste layer 30 can be set according to the structural size of the battery at the inner ring of the winding core, or can be set according to the size of the positive electrode sheet in the battery, which removes the paste. It is the end of the positive electrode sheet close to the center of the battery core. Compared with the missing part of the negative electrode sheet, the embodiment of the present application is not limited to this.
  • the paste layer 30 can be an active material or an inactive material.
  • the selection of the material can be set according to the actual needs of the battery or the user's needs. If it is an active material, the material of the paste layer 30 can be the same as the negative active material. Layer 20 is of the same active material. The embodiments of the present application are not limited to this.
  • the paste layer 30 is made of an active material material, it may also be made of a different active material material than the negative electrode active material layer 20 .
  • the content of the active material in the paste layer 30 may be consistent with the active material content of the negative active material layer 20 , for example: if the active material in the negative active material layer 20 If the content is 97.2%, the active material content in the paste layer 30 may also be set at 97.2%.
  • the active material content in the paste layer 30 can also be set to other contents, which is not limited in the embodiments of the present application.
  • the length of the negative active material layer 20 on the first side along the extension direction of the negative current collector 10 is longer than that of the negative electrode.
  • the paste layer 30 is disposed on the first side and fixed to the negative active material layer 20 , wherein the paste layer 30 and the negative active material layer 20 are flush with one end near the center of the battery core.
  • the entire paste layer 30 is attached and fixed to the negative active material layer 20 on the first side, and the paste layer 30 is flush with the end of the negative active material layer 20 near the center of the battery core.
  • the structure is arranged so that after the positive electrode sheet and the above-mentioned negative electrode sheet are wound, the paste layer 30 can play the role of filling the removed paste part of the positive electrode sheet, that is, playing a supporting role, but the paste layer 30 will not As the negative electrode current collector 10 is bent, the entire paste layer 30 will not deform, thereby reducing the core expansion deformation caused by uneven stress during the cyclic expansion process of the core.
  • the negative active material layer 20 is on the first side along the direction in which the negative current collector 10 extends.
  • the length on the second side is greater than the length of the negative active material layer 20 along the extension direction of the negative current collector 10;
  • the paste layer 30 is disposed on the second side and fixed to the negative electrode current collector 10 , wherein the first end of the negative electrode active material layer 20 is flush with the first end of the paste layer 30 along the extension direction of the negative electrode current collector 10 ;
  • the end of the negative active material layer 20 on the first side close to the center of the battery core is the first end of the negative active material layer 20 , and the first end of the paste layer 30 is close to the negative current collector. 10 at one end of the tail.
  • the paste layer 30 is arranged on the above-mentioned second side surface and is completely attached to the negative electrode current collector 10, and the first end of the negative electrode active material layer 20 is flush with the first end of the paste layer 30 in the extension direction of the negative electrode current collector 10.
  • Negative active materials are placed on the first side and the second side.
  • the length of the negative active material layer 20 on the first side along the extension direction of the negative electrode current collector 10 is greater than the length of the negative active material layer 20 on the second side along the extension direction of the negative electrode current collector 10. ;
  • the paste layer 30 is disposed on the second side and fixed to the negative electrode current collector 10 , wherein the first end of the negative electrode active material layer 20 and the second end of the paste layer 30 are flush along the extension direction of the negative electrode current collector 10 ;
  • the end of the negative active material layer 20 on the first side close to the center of the battery core is the first end of the negative active material layer 0, and the second end of the paste layer 30 is close to the negative active material.
  • the paste layer 30 is disposed on the second side and is completely attached to the negative electrode current collector 10 , and the first end of the negative active material layer 20 and the second end of the paste layer 30 are located along the negative electrode collector.
  • the extension direction of the fluid 10 is flush.
  • the position of the above-mentioned paste layer in the above-mentioned battery roll core in Figure 10 is different from the position of the above-mentioned paste layer in the above-mentioned battery roll core in Figure 11.
  • the position can be the same position, but the fixing surface of the above-mentioned paste layer is different in the two cases.
  • the paste layer 30 and the negative active material layer 20 provided on the first side are an integral structure; or
  • the negative active material layer 20 and the paste layer 30 together have a two-layer structure.
  • the paste layer 30 and the negative electrode active material layer 20 arranged on the first side are an integrated structure.
  • the paste layer 30 and the negative electrode active material layer 20 are arranged as an integrated structure to reduce the process flow, thereby improving the efficiency of manufacturing the negative electrode sheet without affecting the normal use of the negative electrode sheet.
  • the negative electrode active material layer 20 and the paste layer 30 can also be combined into a double-layer structure.
  • the paste layer 30 is fixed to the negative electrode active material layer 20 in a single structure, it is a double-layer structure.
  • the paste layer 30 can fill the gap between the positive electrode sheet and the negative electrode sheet near the center end of the battery roll core.
  • the ejection speed of the coating die can be controlled to realize the integrated structure of the paste layer 30 and the negative active material layer 20. It should be noted that the products produced in this way The above-mentioned negative electrode sheet, paste layer 30 and negative electrode active material layer 20 may be made of the same material.
  • the paste layer 30 includes at least one of artificial graphite, natural graphite, mesophase carbon microspheres, soft carbon, hard carbon, and organic polymer compound carbon.
  • the length of the paste layer 30 along the extension direction of the negative electrode sheet is the same as the length of the positive electrode sheet that is removed from the paste.
  • the positive electrode sheet is removed from the paste at one end of the positive electrode sheet close to the center of the roll core. The missing part of the negative electrode piece.
  • the length of the paste layer 30 along the extension direction of the negative electrode sheet is set to be consistent with the length of the positive electrode sheet for removing paste.
  • the paste layer 30 can fill the gaps while simultaneously It does not affect the internal structure of the battery and reduces the impact on the normal operation of the battery.
  • the height of the protrusions of the paste layer is 1.03-1.08 times the thickness of the positive electrode sheet.
  • the thickness of the paste layer 30 is less than or equal to 1.08 times the thickness of the above-mentioned positive electrode sheet, and the thickness of the paste layer 30 is greater than or equal to 1.03 times the thickness of the above-mentioned positive electrode sheet.
  • the thickness of the paste layer 30 can be 1.08 times the thickness of the above-mentioned positive electrode sheet. 1.04 times the thickness.
  • the thickness of the paste layer 30 may be 1.07 times the thickness of the above-mentioned positive electrode sheet. This is only an example and not a limitation.
  • the paste layer 30 includes at least one of pressure-sensitive adhesive, ceramic, and polymer layers.
  • the paste layer 30 is made of inactive materials, including one or more of pressure-sensitive adhesive, ceramics and polymer layers, which reduces the impact on the internal structure of the battery and the environment without affecting the The normal operation of the battery not only fills the gap between the positive electrode sheet and the above-mentioned negative electrode sheet, but also effectively improves the use effect of the battery.
  • the polymer layer includes at least one of polyethylene, polypropylene, polyethylene terephthalate, polyvinyl chloride, polyimide and polyurethane, and/or;
  • the pressure-sensitive adhesive includes at least one of rubber, silicone, acrylate and polyurethane.
  • embodiments of the present application also provide a battery, including the above-mentioned winding core.
  • the above-mentioned batteries can be applied to various electrical equipment, and the electrical equipment can So laptops, smartphones, new energy vehicles and other equipment.
  • the implementation manner of the above battery embodiment is also applicable to the embodiment of the electronic device and can achieve the same technical effect, and will not be described again here.

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Abstract

一种卷芯和电池，其中，卷芯包括：正极片，具有正极片退膏，正极片退膏为正极片在卷芯的卷绕起始端处相较于负极片缺少的部分；负极片，包括负极集流体(10)、负极活性物质层(20)和间隙填充体(30)；负极集流体(10)包括相对的第一侧面和第二侧面，第一侧面和第二侧面中的至少一侧面设置有负极活性物质层(20)；间隙填充体(30)设置于第一侧面和第二侧面中的一侧面上的与卷芯的卷绕起始端对应的位置。上述卷芯和电池提高了卷芯内圈的平整度，减小电池在循环膨胀过程中因受力不均导致的膨胀变形，也减小了因边缘析锂导致的容量衰减和电池失效，进而提升了电池的使用效果。

Description

一种卷芯及电池
本申请要求于2022年09月15日提交中国专利局、申请号为202222450151.X、申请名称为“一种负极片及电池”的中国专利申请和2022年10月09日提交中国专利局、申请号为202222650473.9、申请名称为“一种负极片及电池”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电池技术领域，尤其涉及一种卷芯及电池。
背景技术
锂离子电池广泛投入至人们的日常生活使用之中，其中，锂离子电池具有比能量高、自放电低、循环寿命长和对环境无污染等特点，伴随着锂离子电池技术的迅速发展，人们对于锂离子电池能量密度、快速充电能力以及充放电倍率提出了更高的要求。
在现有技术中，常规卷绕式锂离子电池结构无法满足快速充电的需求，所以需要将极耳的位置移动到正负极片的3/4、1/3或是1/2等处的位置，为了防止边缘析锂，又需要对正极片进行裁剪，使得负极片覆盖正极片，从而使得卷芯在该位置存在缝隙，导致卷芯内圈不平整，进而使得电池使用效果较差。
发明内容
本申请提供一种卷芯及电池，以解决现有技术中电池因卷芯内圈不平整而导致的电池使用效果较差的问题。
为了实现上述目的，本申请提供一种卷芯，其特征在于，包括：正极片，所述正极片具有正极片退膏，所述正极片退膏为所述正极片在所述卷芯的卷绕起始端处相较于负极片缺少的部分；负极片，所述负极片包括 负极集流体、负极活性物质层和间隙填充体；所述负极集流体包括相对的第一侧面和第二侧面，所述第一侧面和所述第二侧面中的至少一侧面设置有所述负极活性物质层；所述间隙填充体设置于所述第一侧面和第二侧面中的一侧面上的与所述卷芯的卷绕起始端对应的位置，所述间隙填充体填充所述正极片与所述负极片在所述卷芯的卷绕起始端处的缝隙。
可选地，所述第一侧面的所述负极活性物质层在所述负极集流体延伸方向上的长度大于所述第二侧面的所述负极活性物质层在所述负极集流体延伸方向上的长度，所述负极集流体的长度大于所述第一侧面的所述负极活性物质层的长度。
可选地，所述间隙填充体设置于所述第一侧面，所述间隙填充体的至少部分与所述负极活性物质层固定。
可选地，所述间隙填充体的第一端与所述第一侧面的所述负极活性物质层的第一端齐平，所述第一侧面的所述负极活性物质层的第一端为所述负极活性物质层靠近所述卷芯的卷绕起始端的一端，所述间隙填充体的第一端为所述间隙填充体靠近所述负极集流体的尾部的一端。
可选地，所述间隙填充体的一部分与所述负极活性物质层固定，另一部分与所述负极集流体固定。
可选地，所述间隙填充体设置于所述第二侧面，且所述负极集流体的长度大于设置于所述第二侧面的所述负极活性物质层的长度，所述间隙填充体与所述负极集流体固定。
可选地，所述第一侧面的所述负极活性物质层的第一端与所述间隙填充体的第一端和第二端的中心相对；所述第一侧面的所述负极活性物质层的第一端为所述负极活性物质层靠近所述卷芯的卷绕起始端的一端，所述间隙填充体的第一端为靠近所述负极集流体的尾部的一端，所述间隙填充体的第二端为远离所述负极集流体的尾部的一端。
可选地，所述第一侧面的负极活性物质层的第一端与所述间隙填充体的第一端齐平；或者，所述负极活性物质层的第一端与所述间隙填充体的第二端齐平；所述第一侧面的所述负极活性物质层的第一端为所述负极活性物质层靠近所述卷芯的卷绕起始端的一端，所述间隙填充体的第一端为靠近所述 负极集流体的尾部的一端，所述间隙填充体的第二端为远离所述负极集流体的尾部的一端。
可选地，所述间隙填充体为胶贴。
可选地，所述胶贴具有通孔结构。
可选地，所述胶贴包括绝缘层和胶层，所述胶层与所述负极片固定，所述绝缘层位于所述胶层的背离所述负极片的一侧。
可选地，所述胶层的厚度值大于等于2μm，且所述胶层的厚度值小于等于第一预设值；和/或，所述绝缘层的厚度值大于等于2μm，且所述绝缘层的厚度值小于等于第一预设值；所述第一预设值大于等于所述正极片退膏的厚度值的一半减10μm，且所述第一预设值小于等于所述正极片退膏的厚度值的一半减4μm。
可选地，所述胶贴的厚度为所述正极片厚度的0.52-0.55倍。
可选地，所述胶贴在沿所述负极片延伸方向上的长度为所述正极片退膏的长度的1.8-2.2倍。
可选地，所述间隙填充体为涂膏层，所述涂膏层在垂直于所述负极活性物质层的方向上设置有凸起。
可选地，所述涂膏层与设置于所述第一侧面的所述负极活性物质层为一体结构；或所述负极活性物质层和所述涂膏层合一起为双层结构。
可选地，所述涂膏层包括人造石墨、天然石墨、中间相碳微球、软碳、硬碳和有机聚合物化合物碳中的至少一种。
可选地，所述涂膏层沿所述负极片延伸方向上的长度与所述正极片退膏的长度相同。
可选地，所述涂膏层的所述凸起的高度为所述正极片厚度的1.03-1.08倍。
可选地，所述涂膏层包括压敏胶、陶瓷和聚合物层中的至少一种。
可选地，所述聚合物层包括聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚氯乙烯、聚酰亚胺和聚氨酯中的至少一种，和/或；所述压敏胶包括橡胶、硅胶、丙烯酸酯和聚氨酯中的至少一种。
本申请还提供一种电池，包括本申请第一方面所述的卷芯。
本申请中，因相关技术中为了防止边缘析锂，所以会将正极片进行裁剪， 裁剪后的负极片会覆盖住正极片，从而使得电池卷芯在该位置留有缝隙，导致卷芯内圈不平整，本申请实施例中的负极片包括有间隙填充体，间隙填充体设置于第一侧面和第二侧面中的一侧面中靠近电池卷芯的卷绕起始端的一端，间隙填充体能够填充正极片与负极片在电池卷芯的卷绕起始端处的缝隙，减小了间隙填充体因弯折导致的凸起和不平整；提高电池在卷芯内圈的平整度，减小电池在循环膨胀过程中因受力不均导致的膨胀变形，也减小了因边缘析锂导致的容量衰减和电池失效，从而提升了电池的使用效果。
应当理解，本部分所描述的内容并非旨在标识本申请的实施例的关键或重要特征，也不用于限制本申请的范围。本申请的其他特征将通过以下的说明书而变得容易理解。
附图说明
为了更清楚地说明本申请实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作以简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是相关技术中卷绕式电池的结构示意图；
图2a是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图之一；
图2b是图2a中所示的负极片在卷绕状态下的结构示意图；
图3是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图之二；
图4是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图之三；
图5a是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图之四；
图5b是图5a中所示的负极片在卷绕状态下的结构示意图；
图6是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图之五；
图7是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图 之六；
图8是本申请实施例提供的间隙填充体为胶贴时的负极片的结构示意图之七；
图9是本申请实施例提供的间隙填充体为涂膏层时的负极片的结构示意图之八；
图10是本申请实施例提供的间隙填充体为涂膏层时的负极片的结构示意图之九；
图11是本申请实施例提供的间隙填充体为涂膏层时的负极片的结构示意图之十；
图12是本申请实施例提供的间隙填充体为涂膏层时的负极片的结构示意图之十一；
图13是本申请实施例提供的间隙填充体为涂膏层时的负极片的结构示意图之十二。
附图标记说明：
10-负极集流体；
20-负极活性物质层；
30-间隙填充体。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请实施例中的术语“第一”、“第二”等是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本申请第一方面的卷芯包括正极片和负极片，正极片和负极片可以卷绕 形成卷芯，可以理解地，正极片和负极片之间具有隔膜。
其中，正极片具有正极片退膏，正极片退膏为正极片靠近卷芯的中心的一端，相较于负极片缺少的部分，如此，正极片和负极片之间在靠近电池卷芯的中心的一端具有缝隙。换言之，正极片退膏为正极片在卷芯的卷绕起始端处相较于负极片缺少的部分，正极片和负极片在电池卷芯卷绕起始端处具有缝隙。可以理解地，由于卷芯在卷绕时是从内向外卷绕，因此此处的卷绕起始端是指卷芯在卷绕过程中的起始位置，也是卷芯在厚度方向的中心线的沿水平方向的一端，还是正极片和负极片上处于卷芯最内侧的一端。
如图2a至图13，负极片包括负极集流体10、负极活性物质层20和间隙填充体30；负极集流体10包括相对的第一侧面和第二侧面，所述第一侧面和所述第二侧面中的至少一侧面设置有负极活性物质层20；间隙填充体30设置于所述第一侧面和第二侧面中的一侧面中靠近电池卷芯的中心的一端，间隙填充体30用于填平正极片与所述负极片靠近所述电池卷芯的中心的一端的缝隙。
该实施方案中，上述负极片包括有负极集流体10、负极活性物质层20和间隙填充体30，间隙填充体30设置于上述第一侧面和上述第二侧面的其中一侧面，并且靠近上述电池卷芯中心的一端，间隙填充体30能够填平正极片与上述负极片靠近上述电池卷芯的中心的一端的缝隙，从而提高电池在卷芯内圈的平整度，减小电池在循环膨胀过程中因受力不均导致的膨胀变形，另一方面，也减小了因边缘析锂导致的容量衰减和电池失效，进而提升了电池的使用效果。
下面描述本申请的卷芯的一些具体实施例。
如图2a至图8，本申请实施例一提供的负极片中，间隙填充体30为胶贴30。负极集流体10包括相对的第一侧面和第二侧面，所述第一侧面和所述第二侧面中的至少一侧面设置有负极活性物质层20；胶贴30具有通孔结构；胶贴30设置于所述第一侧面和第二侧面中的一侧面中靠近电池卷芯的中心的一端，胶贴30用于填平正极片与所述负极片靠近所述电池卷芯的中心的一端的缝隙。
该实施方案中，上述负极片包括有负极集流体10、负极活性物质层20和胶贴30，胶贴30设置于上述第一侧面和上述第二侧面的其中一侧面，并且 靠近上述电池卷芯中心的一端，胶贴30能够填平正极片与上述负极片靠近上述电池卷芯的中心的一端的缝隙，从而提高电池在卷芯内圈的平整度，减小电池在循环膨胀过程中因受力不均导致的膨胀变形，另一方面，也减小了因边缘析锂导致的容量衰减和电池失效，进而提升了电池的使用效果。
其中，胶贴30还可以是具有上述通孔结构，通过上述通孔结构的设置，可以提高电池在卷绕处理后，电池中锂离子的传递，所以说胶贴30通过上述通孔结构的设置，在一定程度上减小了对于电池内部反应或是过程的影响，另一方面，若胶贴30在需要弯折的情况下，上述通孔结构的设置可以减小胶贴30因弯折导致的凸起或是不平整。
请参见图2a、图2b和图3所示，上述通孔结构设置在胶贴30的位置可以是根据胶贴30设置在负极集流体10或是负极活性物质层20的位置来确定，如图2a所示的情况下，上述通孔结构设置于如图2a所示方向的胶贴30的左侧，如图3所示的情况下，上述通孔结构设置于如图2a所示方向的胶贴30的靠中心位置。
需要说明的是，上述通孔结构可以是根据用户需求进行添加设置，在胶贴30没有设置上述通孔结构的情况下，仍然可以提高电池在卷芯内圈的平整度，减小电池在循环膨胀过程中因受力不均导致的膨胀变形，对此本申请实施例不再赘述。
应理解，胶贴30可以是设置于上述第一侧面，也可以是设置于上述第二侧面，胶贴30在设置于负极活性物质层20的两侧面后，通过卷绕处理，可以有效地填补卷芯内圈的缝隙，从而减小电池边缘析锂的可能性。
另外，胶贴30可以是直接与负极集流体10进行固定，胶贴30也可以是一部分与负极集流体10固定，胶贴30的另一部分与负极活性物质层20进行固定。
具体可以是：若胶贴30设置于两侧面中负极活性物质层20沿负极集流体10延伸方向上长度较长的一侧面时，胶贴30可以是一部分与负极集流体10贴合固定，另一部分与负极活性物质层20贴合固定，在将上述负极片与正极搭配并进行卷绕后，胶贴30可以是提高电池在卷芯内圈处的平整度。
若胶贴30设置于两侧面中负极活性物质层20沿负极集流体10延伸方向上长度较短的一侧面时，胶贴30可以是完全与负极集流体10贴合固定， 在将上述负极片与正极搭配并进行卷绕后，胶贴30依旧可以是提高电池在卷芯内圈处的平整度。
应理解，胶贴30的长度以及厚度可以是根据电池在卷芯内圈处的结构尺寸来进行设定，也可以是根据电池中正极片退膏的尺寸来进行设定，正极片退膏为正极片靠近电池卷芯的中心的一端，相较于上述负极片缺少的部分，对此本申请实施例不作限。
可选地，在所述第一侧面和所述第二侧面置有负极活性物质层20的情况下，负极活性物质层20在所述第一侧面沿负极集流体10延伸方向上的长度大于负极活性物质层20在所述第二侧面沿负极集流体10延伸方向上的长度；
胶贴30设置于所述第一侧面的一侧的情况下，且负极集流体10的长度大于设置于所述第一侧面的负极活性物质层20的长度，胶贴30的一部分与负极活性物质层20固定，胶贴30的另一部分与负极集流体10固定；
胶贴30设置于所述第二侧面的一侧的情况下，且负极集流体10的长度大于设置于所述第一侧面的负极活性物质层20的长度，胶贴30与负极集流体10固定。
该实施方案中，在负极活性物质层20在所述第一侧面沿负极集流体10延伸方向上的长度大于负极活性物质层20在所述第二侧面沿负极集流体10延伸方向上的长度的前提条件之下，胶贴30的设置方式以及位置因为负极活性物质层20在两侧的长度不同而发生改变，通过将胶贴30设置于负极集流体的不同两侧，减小了胶贴30设置位置的局限性，又能同时满足提高卷芯内圈平整度的需求，进而提高了电池的使用效果。
需要说明的是，当胶贴30设置于上述第一侧面时，通过卷绕处理后的胶贴30会位于负极集流体10的尾部的外侧，当胶贴30设置于第二侧面时，通过卷绕处理后的胶贴30会位于负极集流体10的尾部的内侧。
可选地，请参见图5，胶贴30设置于所述第二侧面的一侧的情况下，且负极集流体10的长度大于设置于所述第一侧面的负极活性物质层20的长度，胶贴30与负极集流体10固定，其中，负极活性物质层20的第一端以负极集流体10为对称轴，对称到所述第一侧面的位置位于胶贴30的第一端和胶贴30的第二端的中心；
所述第一侧面的负极活性物质层20在靠近所述电池卷芯的中心的一端 为所述负极活性物质层20的第一端，胶贴30的第一端为胶贴30靠近负极集流体10的尾部的一端，胶贴30的第二端为胶贴30靠近负极活性物质层20的一端(即胶贴30的远离负极集流体10尾部的一端)。
在该实施方案中，胶贴30全部贴合固定于负极集流体10上，并且负极活性物质层20的第一端以负极集流体10为对称轴，对称到所述第一侧面的位置位于胶贴30的第一端和胶贴30的第二端的中心，通过该结构的设置，使得在对正极片和上述负极片进行卷绕处理后，胶贴30会随着负极集流体10弯折，并且该情况下，胶贴30位于负极集流体10的尾部的内侧，胶贴30呈双层状，可以有效地平均极片所承受的压力，提高卷芯表面的平整度，从而减小卷芯在循环膨胀过程中因受力不均导致的卷芯膨胀变形。
可选地，请参见图6，胶贴30设置于所述第二侧面的一侧的情况下，且负极集流体10的长度大于设置于所述第一侧面的负极活性物质层20的长度，胶贴30与负极集流体10固定，其中，负极活性物质层20的第一端与胶贴30的第一端在沿负极集流体10延伸方向上齐平；
所述第一侧面的负极活性物质层20在靠近所述电池卷芯的中心的一端为负极活性物质层20的第一端，胶贴30的第一端为胶贴30靠近负极集流体10的尾部的一端。
在该实施方案中，胶贴30全部贴合固定于负极集流体10上，并且负极活性物质层20的第一端与胶贴30的第一端在沿负极集流体10延伸方向上齐平，通过该结构的设置，使得在对正极片和上述负极片进行卷绕处理后，胶贴30会对弯折后的负极集流体10起到支撑的作用，但是胶贴30不会随着负极集流体10进行弯折，胶贴30的整体也不会产生形变，胶贴30呈单层状，可以有效地平均极片所承受的压力，提高卷芯表面的平整度，从而减小卷芯在循环膨胀过程中因受力不均导致的卷芯膨胀变形。
可选地，请参见图7，胶贴30设置于所述第二侧面的一侧的情况下，且负极集流体10的长度大于设置于所述第一侧面的负极活性物质层20的长度，胶贴30与负极集流体10固定，其中，负极活性物质层20的第一端与胶贴30的第二端在沿负极集流体10延伸方向上齐平；
所述第一侧面的负极活性物质层20在靠近所述电池卷芯的中心的一端为负极活性物质层20的第一端，胶贴30的第二端为胶贴30靠近负极活性物 质层20的一端(即胶贴30的第二端为胶贴30的远离负极集流体10尾部的一端)。
在该实施方案中，胶贴30全部贴合固定于负极集流体10上，并且，负极活性物质层20的第一端与胶贴30的第二端在沿负极集流体10延伸方向上齐平，通过该结构的设置，使得在对正极片和上述负极片进行卷绕处理后，胶贴30设置于进行了弯折处理的负极集流体10的尾部，胶贴30的整体也不会产生形变，胶贴30呈单层状，可以有效地平均极片所承受的压力，提高卷芯表面的平整度，从而减小卷芯在循环膨胀过程中因受力不均导致的卷芯膨胀变形。
需要说明的是，图7所示的结构与图6相比，图7中上述胶贴在上述电池卷芯中的位置与图6中上述胶贴在上述电池卷芯的位置可以是同一个位置，但是两种情况下上述胶贴的固定面不一样，以图6和图7的视角为例，图6中的上述胶贴最后是向下固定于上述负极集流体，图7中的上述贴胶最后是向上固定于上述负极集流体。
可选地，胶贴30包括绝缘层和胶层。
该实施方案中，胶贴30可以是包括有两层结构，其中，一层为上述绝缘层，另一层为上述胶层，胶层与负极片固定，绝缘层位于胶层的背离负极片的一侧，上述绝缘层的设置能够减小胶贴30对电池本身内部结构的影响，上述胶层能够提高胶贴30的设置稳定性，减小胶贴30脱落的可能性，通过该结构的设置，使得胶贴30保持固定稳定性的同时，也够能减小对电池正常运行的影响。
需要说明的是，上述绝缘层的厚度以及上述胶层的厚度可以是根据电池中正极片的厚度来进行设定，而上述绝缘层和上述胶层在沿极片长度方向上的长度可以是根据正极片退膏来进行设定，对此本申请实施例不作限定。
另外，上述绝缘层可以是选择适用于电池中的绝缘材料，例如：聚合物层，其中，可以是选用一种绝缘材料，也可以是选择多种绝缘材料进行混合制造得到。
同样地，上述胶层也可以是选择适用于电池中的胶质材料，例如：橡胶和硅胶，合适的胶质材料可以减小在电池内部环境下脱落的可能性，并且上述胶层可以是选用一种胶质材料，也可以是选择多种胶质材料进行混合制造 得到，对于上述绝缘层和上述胶层的材料选择，本申请实施例不作限定。
可选地，所述胶层的厚度值大于等于2μm，且所述胶层的厚度值小于等于第一预设值；
所述第一预设值大于等于正极片退膏的厚度值的一半减10μm，且所述第一预设值小于等于正极片退膏的厚度值的一半减4μm，所述正极片退膏为所述正极片靠近所述电池卷芯的中心的一端，相较于所述负极片缺少的部分。
该实施方案中，在上述胶层的制造过程中，需要将上述胶层的厚度设置在2μm和上述第一预设值之间，例如：上述胶层的厚度可以是选定在2μm和正极片退膏的厚度值的一半减10μm之间，可变换地，在另一个可行的实施方式中，上述胶层的厚度可以是选定在正极片退膏的厚度值的一半减10μm与正极片退膏的厚度值的一半减4μm之间，此处仅作示例，不作限定。
需要说明的是，胶贴30在限定了与正极片的厚度关系的情况下，根据两者之间的厚度关系以及上述胶层的厚度可以确定上述绝缘层的厚度，不需要对上述绝缘层的厚度进行限定和计算。
可选地，所述绝缘层的厚度值大于等于2μm，且所述绝缘层的厚度值小于等于第一预设值；
所述第一预设值大于等于正极片退膏的厚度值的一半减10μm，且所述第一预设值小于等于正极片退膏的厚度值的一半减4μm，所述正极片退膏为所述正极片靠近所述电池卷芯的中心的一端，相较于所述负极片缺少的部分。
该实施方案中，在上述绝缘层的制造过程中，需要将上述绝缘层的厚度设置在2μm和上述第一预设值之间，例如：上述绝缘层的厚度可以是选定在2μm和正极片退膏的厚度值的一半减10μm之间，可变化地，在另一个可行的实施方式中，上述绝缘层的厚度可以是选定在正极片退膏的厚度值的一半减10μm与正极片退膏的厚度值减4μm之间，此处仅作示例，不作限定。
需要说明的是，胶贴30在限定了与正极片的厚度关系的情况下，根据两者之间的厚度关系以及上述绝缘层的厚度可以确定上述胶层的厚度，不需要对上述胶层的厚度进行限定和计算。
可选地，所述绝缘层包括聚合物层、美纹纸和格拉辛纸中的至少一种。
该实施方案中，上述绝缘层采用聚合物层、美纹纸和格拉辛纸中的一种或多种制成，聚合物层、美纹纸和格拉辛纸可以是应用于电子元件中，且具 有耐高温、抗化学溶剂佳、高粘着力、柔软服贴和再撕不留残胶等特性，满足上述负极片中的需求，从而使得胶贴30适用于电池的内部结构，提高卷芯内圈的平整度，进而提高电池的使用效果。
可选地，所述聚合物层包括聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚氯乙烯、聚酰亚胺和聚氨酯中的至少一种。
可选地，所述胶层包括橡胶、硅胶、丙烯酸酯和聚氨酯中的至少一种。
可选地，胶贴30的厚度为正极片厚度的0.52-0.55倍。
该实施方案中，胶贴30的厚度小于等于上述正极片厚度的0.55倍，胶贴30的厚度大于等于上述正极片厚度的0.52倍，例如：胶贴30的厚度可以是上述正极片厚度的0.53倍，可变换地，在另一个可行的实施方式中，胶贴30的厚度也可以是上述正极片的0.55倍，此处仅作示例，不作限定。
可选地，胶贴30在沿所述负极片延伸方向上的长度为正极片退膏的长度的1.8-2.2倍，所述正极片退膏为所述正极片靠近所述电池卷芯的中心的一端，相较于所述负极片缺少的部分。
该实施方案中，胶贴30在沿所述负极片延伸方向上的长度大于等于正极片退膏的长度的1.8倍，胶贴30在沿所述负极片延伸方向上的长度小于等于正极片退膏的长度的2.2倍，例如：胶贴30在沿所述负极片延伸方向上的长度可以是正极片退膏的长度的1.9倍，可变换地，在另一个可行的实施例中，胶贴30在沿所述负极片延伸方向上的长度可以是正极片退膏的长度的2.1倍，此处仅作示例，不作限定。
如图9-图13所示，本申请实施例二提供的负极片中，间隙填充体30为涂膏层30；负极集流体10包括相对的第一侧面和第二侧面，所述第一侧面和所述第二侧面中的至少一侧设置有负极活性物质层20；涂膏层30设置于所述第一侧面和所述第二侧面中的一侧面中靠近电池卷芯的中心的一端，涂膏层30在垂直于负极活性物质层20的方向上设置有凸起，涂膏层30用于填平正极片与所述负极片靠近所述电池卷芯的中心一端的缝隙。
该实施方案中，上述负极片包括有负极集流体10、负极活性物质层20和涂膏层30，涂膏层30可以是设置于上述第一侧面并与负极活性物质层20固定，涂膏层30在垂直于负极活性物质层20的方向上设置有凸起，并带有一定的凸起高度，另外，涂膏层30与负极活性物质层20靠近电池卷芯的中心 一端齐平，当然，涂膏层30也可以是设置于上述第二侧面并与负极集流体10固定，涂膏层30能够填平正极片与上述负极片靠近上述电池卷芯的中心的一端的缝隙，从而提高电池在卷芯内圈的平整度，减小电池在循环膨胀过程中因受力不均导致的膨胀变形，同时也减小了因边缘析锂导致的容量衰减和电池失效，进而提升了电池的使用效果。
需要说明的是，在所述第一侧面和所述第二侧面置有所述负极活性物质层的情况下，所述负极活性物质层在所述第一侧面沿所述负极集流体延伸方向上的长度大于所述负极活性物质层在所述第二侧面沿所述负极集流体延伸方向上的长度。
另外，涂膏层30可以是作为一个单独的结构与负极活性物质层20进行固定，涂膏层30也可以是与负极活性物质层20作为一个整体结构，当涂膏层30以单独结构固定于负极活性物质层20的时，涂膏层30可以填平正极片与上述负极片靠近上述电池卷芯的中心一端的缝隙，当涂膏层30和负极活性物质层20作为一个整体结构的时，涂膏层30同样可以填平正极片与上述负极片靠近上述电池卷芯的中心一端的缝隙，对此本申请实施例不作限定。
应理解，涂膏层30的长度以及厚度可以是根据电池在卷芯内圈处的结构尺寸来进行设定，也可以是根据电池中正极片退膏的尺寸来进行设定，正极片退膏为正极片靠近电池卷芯的中心的一端，相较于上述负极片缺少的部分，对此本申请实施例不作限。
另外，涂膏层30可以是活性物质，也可以是非活性物质，材料的选定可以根据电池实际需求或是用户需求进行设定，如果是活性物质则涂膏层30的材料可以与负极活性物质层20为同一种活性材料。对此本申请实施例不作限定。
需要说明的是，若涂膏层30采用活性物质材料制成，也可以是与负极活性物质层20采用不同的活性物质材料。
可选地，若涂膏层30采用活性物质材料制成，涂膏层30中活性物质的含量可以是与负极活性物质层20的活性物质含量一致，例如：若负极活性物质层20中活性物质含量为97.2％，则涂膏层30中活性物质含量也可以是设置在97.2％。当然，涂膏层30中活性物质含量也可以是设置为其他含量，对此本申请实施例不作限定。
可选地，在所述第一侧面和所述第二侧面置有负极活性物质层20的情况下，负极活性物质层20在所述第一侧面沿负极集流体10延伸方向上的长度大于负极活性物质层20在所述第二侧面沿负极集流体10延伸方向上的长度；
涂膏层30设置于所述第一侧面并与负极活性物质层20固定，其中，涂膏层30与负极活性物质层20靠近所述电池卷芯的中心一端齐平。
该实施方案中，涂膏层30全部贴合固定于上述第一侧面的负极活性物质层20，并且涂膏层30与负极活性物质层20靠近所述电池卷芯的中心一端齐平，通过该结构的设置，使得在对正极片和上述负极片进行卷绕处理后，涂膏层30可以是起到填补正极片退膏部分的作用，即起到支撑的作用，但是涂膏层30不会随着负极集流体10进行弯折，涂膏层30的整体也不会产生形变，从而减小卷芯在循环膨胀过程中因受力不均导致的卷芯膨胀变形。
可选地，请参见图10，在所述第一侧面和所述第二侧面置有负极活性物质层20的情况下，负极活性物质层20在所述第一侧面沿负极集流体10延伸方向上的长度大于负极活性物质层20在所述第二侧面沿负极集流体10延伸方向上的长度；
涂膏层30设置于所述第二侧面并与负极集流体10固定，其中，负极活性物质层20的第一端与涂膏层30的第一端在沿负极集流体10延伸方向上齐平；
所述第一侧面的负极活性物质层20在靠近所述电池卷芯的中心的一端为负极活性物质层20的第一端，涂膏层30的第一端为涂膏层30靠近负极集流体10的尾部的一端。
在该实施方案中，涂膏层30设置于上述第二侧面，并且全部贴合于负极集流体10，并且负极活性物质层20的第一端与涂膏层30的第一端在沿负极集流体10延伸方向上齐平，通过该结构的设置，使得在对正极片和上述负极片进行卷绕处理后，涂膏层30会对弯折后的负极集流体10起到支撑的作用，但是涂膏层30不会随着负极集流体10进行弯折，涂膏层30的整体也不会产生形变，涂膏层30呈单层状，可以有效地平均极片所承受的压力，提高卷芯表面的平整度，从而减小卷芯在循环膨胀过程中因受力不均导致的卷芯膨胀变形。
可选地，请参见图11，在所述第一侧面和所述第二侧面置有负极活性物 质层20的情况下，负极活性物质层20在所述第一侧面沿负极集流体10延伸方向上的长度大于负极活性物质层20在所述第二侧面沿负极集流体10延伸方向上的长度；
涂膏层30设置于所述第二侧面并与负极集流体10固定，其中，负极活性物质层20的第一端与涂膏层30的第二端在沿负极集流体10延伸方向上齐平；
所述第一侧面的负极活性物质层20在靠近所述电池卷芯的中心的一端为负极活性物质层0的第一端，涂膏层30的第二端为涂膏层30靠近负极活性物质层20的一端。
在该实施方案中，涂膏层30设置于上述第二侧面，并且全部贴合于负极集流体10，并且负极活性物质层20的第一端与涂膏层30的第二端在沿负极集流体10延伸方向上齐平，通过该结构的设置，使得在对正极片和上述负极片进行卷绕处理后，涂膏层30设置于进行了弯折处理的负极集流体10的尾部，涂膏层30的整体也不会产生形变，涂膏层30呈单层状，可以有效地平均极片所承受的压力，提高卷芯表面的平整度，从而减小卷芯在循环膨胀过程中因受力不均导致的卷芯膨胀变形。
需要说明的是，图10所示的结构和图11所示的结构相比，图10中上述涂膏层在上述电池卷芯中的位置与图11中上述涂膏层在上述电池卷芯的位置可以是同一个位置，但是两种情况下上述涂膏层的固定面不一样。
其中，以图10和图11的视角为例，图10中的上述涂膏层最后是向下固定于上述负极集流体，图11中的上述涂膏层最后是向上固定于上述负极集流体。
可选地，请参见图12，涂膏层30与设置于所述第一侧面的负极活性物质层20为一体结构；或
负极活性物质层20和涂膏层30合一起为双层结构。
在该实施方案中，涂膏层30与设置于上述第一侧面的负极活性物质层20为一体结构，将涂膏层30和负极活性物质层20设置为一体结构可以减少工艺流程，从而在不影响上述负极片正常使用的情况下，提高了上述负极片制作的效率，另外，负极活性物质层20和涂膏层30也可以是合一起为双层结构，当涂膏层30以单独结构固定于负极活性物质层20的时，即为双层结构， 涂膏层30可以填平正极片与上述负极片靠近上述电池卷芯的中心一端的缝隙。
其中，在电池制作工艺中涂布的时候，可以是控制涂布模头的喷出速度来实现涂膏层30和负极活性物质层20的一体化结构，需要说明的是，通过该方式制作的上述负极片，涂膏层30和负极活性物质层20可以是同一种材料。
可选地，涂膏层30包括人造石墨、天然石墨、中间相碳微球、软碳、硬碳和有机聚合物化合物碳中的至少一种。
可选地，涂膏层30沿所述负极片延伸方向上的长度与正极片退膏的长度相同，所述正极片退膏为所述正极片靠近所述卷芯的中心的一端，相较于所述负极片缺少的部分。
在该实施方案中，将涂膏层30沿所述负极片延伸方向上的长度设置为与上述正极片退膏的长度一致，通过该结构的设置，可以在涂膏层30填补缝隙的同时，不影响电池内部结构，减小对电池正常运行的影响。
可选地，所述涂膏层的所述凸起的高度为正极片厚度的1.03-1.08倍。
该实施方案中，涂膏层30的厚度小于等于上述正极片厚度的1.08倍，涂膏层30的厚度大于等于上述正极片厚度的1.03倍，例如：涂膏层30的厚度可以是上述正极片厚度的1.04倍，可变换地，在另一个可行的实施方式中，涂膏层30的厚度可以是上述正极片厚度的1.07倍，此处仅作示例，不作限定。
可选地，涂膏层30包括压敏胶、陶瓷和聚合物层中的至少一种。
在该实施方案中，涂膏层30采用非活性物质制成，其中包括压敏胶、陶瓷和聚合物层中的一种或多种，减小了对电池内部结构及环境的影响，不影响电池的正常运转，从而在填平正极片与上述负极片之间缝隙的同时，也有效地提高了电池的使用效果。
可选地，所述聚合物层包括聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚氯乙烯、聚酰亚胺和聚氨酯中的至少一种，和/或；
所述压敏胶包括橡胶、硅胶、丙烯酸酯和聚氨酯中的至少一种。
另外，本申请实施例还提供了一种电池，包括上述卷芯。
需要说明的是，上述电池可以是应用到各种用电设备之中，用电设备可 以是笔记本电脑、智能手机、新能源汽车等设备。上述电池的实施例的实现方式同样适应于该电子设备的实施例中，并能达到相同的技术效果，在此不再赘述。
需要说明的是，在本文中，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者装置不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者装置所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括该要素的过程、方法、物品或者装置中还存在另外的相同要素。此外，需要指出的是，本申请实施方式中的方法和装置的范围不限于按所讨论的顺序来执行功能，还可包括根据所涉及的功能按基本同时的方式或按相反的顺序来执行功能，例如，可以按不同于所描述的次序来执行所描述的方法，并且还可以添加、省去、或组合各种步骤。另外，参照某些示例所描述的特征可在其他示例中被组合。
上面结合附图对本申请的实施例进行了描述，但是本申请并不局限于上述的具体实施方式，上述的具体实施方式仅仅是示意性的，而不是限制性的，本领域的普通技术人员在本申请的启示下，在不脱离本申请宗旨和权利要求所保护的范围情况下，还可做出很多形式，均属于本申请的保护之内。

Claims (22)

  1. 一种卷芯，其特征在于，包括：
    正极片，所述正极片具有正极片退膏，所述正极片退膏为所述正极片在所述卷芯的卷绕起始端处相较于负极片缺少的部分；
    负极片，所述负极片包括负极集流体(10)、负极活性物质层(20)和间隙填充体(30)；
    所述负极集流体(10)包括相对的第一侧面和第二侧面，所述第一侧面和所述第二侧面中的至少一侧面设置有所述负极活性物质层(20)；
    所述间隙填充体(30)设置于所述第一侧面和第二侧面中的一侧面上的与所述卷芯的卷绕起始端对应的位置，所述间隙填充体(30)填充所述正极片与所述负极片在所述卷芯的卷绕起始端处的缝隙。
  2. 根据权利要求1所述的卷芯，其特征在于，所述第一侧面的所述负极活性物质层(20)在所述负极集流体(10)延伸方向上的长度大于所述第二侧面的所述负极活性物质层(20)在所述负极集流体(10)延伸方向上的长度，所述负极集流体(10)的长度大于所述第一侧面的所述负极活性物质层(20)的长度。
  3. 根据权利要求2所述的卷芯，其特征在于，所述间隙填充体(30)设置于所述第一侧面，所述间隙填充体(30)的至少部分与所述负极活性物质层(20)固定。
  4. 根据权利要求3所述的卷芯，其特征在于，所述间隙填充体(30)的第一端与所述第一侧面的所述负极活性物质层(30)的第一端齐平，
    所述第一侧面的所述负极活性物质层(20)的第一端为所述负极活性物质层(20)靠近所述卷芯的卷绕起始端的一端，所述间隙填充体(30)的第一端为所述间隙填充体(30)靠近所述负极集流体(10)的尾部的一端。
  5. 根据权利要求3所述的卷芯，其特征在于，所述间隙填充体(30)的一部分与所述负极活性物质层(20)固定，另一部分与所述负极集流体(10)固定。
  6. 根据权利要求2所述的卷芯，其特征在于，所述间隙填充体(30)设置于所述第二侧面，且所述负极集流体(10)的长度大于设置于所述第二侧 面的所述负极活性物质层(20)的长度，所述间隙填充体(30)与所述负极集流体(10)固定。
  7. 根据权利要求6所述的卷芯，其特征在于，所述第一侧面的所述负极活性物质层(20)的第一端与所述间隙填充体(30)的第一端和第二端的中心相对；
    所述第一侧面的所述负极活性物质层(20)的第一端为所述负极活性物质层(20)靠近所述卷芯的卷绕起始端的一端，所述间隙填充体(30)的第一端为靠近所述负极集流体(10)的尾部的一端，所述间隙填充体(30)的第二端为远离所述负极集流体(10)的尾部的一端。
  8. 根据权利要求6所述的卷芯，其特征在于，所述第一侧面的负极活性物质层(20)的第一端与所述间隙填充体(30)的第一端齐平；或者，
    所述负极活性物质层(20)的第一端与所述间隙填充体(30)的第二端齐平；
    所述第一侧面的所述负极活性物质层(20)的第一端为所述负极活性物质层(20)靠近所述卷芯的卷绕起始端的一端，所述间隙填充体(30)的第一端为靠近所述负极集流体(10)的尾部的一端，所述间隙填充体(30)的第二端为远离所述负极集流体(10)的尾部的一端。
  9. 根据权利要求1-3以及5-8中任一项所述的卷芯，其特征在于，所述间隙填充体(30)为胶贴(30)。
  10. 根据权利要求9所述的卷芯，其特征在于，所述胶贴(30)具有通孔结构。
  11. 根据权利要求9所述的卷芯，其特征在于，所述胶贴(30)包括绝缘层和胶层，所述胶层与所述负极片固定，所述绝缘层位于所述胶层的背离所述负极片的一侧。
  12. 根据权利要求11所述的卷芯，其特征在于，所述胶层的厚度值大于等于2μm，且所述胶层的厚度值小于等于第一预设值；和/或，所述绝缘层的厚度值大于等于2μm，且所述绝缘层的厚度值小于等于第一预设值；
    所述第一预设值大于等于所述正极片退膏的厚度值的一半减10μm，且所述第一预设值小于等于所述正极片退膏的厚度值的一半减4μm。
  13. 根据权利要求9所述的卷芯，其特征在于，所述胶贴(30)的厚度为所述正极片厚度的0.52-0.55倍。
  14. 根据权利要求9所述的卷芯，其特征在于，所述胶贴(30)在沿所述负极片延伸方向上的长度为所述正极片退膏的长度的1.8-2.2倍。
  15. 根据权利要求1-4、6和8中任一项所述的卷芯，其特征在于，所述间隙填充体(30)为涂膏层(30)，所述涂膏层(30)在垂直于所述负极活性物质层(20)的方向上设置有凸起。
  16. 根据权利要求15所述的卷芯，其特征在于，所述涂膏层(30)与设置于所述第一侧面的所述负极活性物质层(20)为一体结构；或
    所述负极活性物质层(20)和所述涂膏层(30)合一起为双层结构。
  17. 根据权利要求15所述的卷芯，其特征在于，所述涂膏层(30)包括人造石墨、天然石墨、中间相碳微球、软碳、硬碳和有机聚合物化合物碳中的至少一种。
  18. 根据权利要求15所述的卷芯，其特征在于，所述涂膏层(30)沿所述负极片延伸方向上的长度与所述正极片退膏的长度相同。
  19. 根据权利要求15所述的卷芯，其特征在于，所述涂膏层(30)的所述凸起的高度为所述正极片厚度的1.03-1.08倍。
  20. 根据权利要求15所述的卷芯，其特征在于，所述涂膏层(30)包括压敏胶、陶瓷和聚合物层中的至少一种。
  21. 根据权利要求20所述的卷芯，其特征在于，所述聚合物层包括聚乙烯、聚丙烯、聚对苯二甲酸乙二醇酯、聚氯乙烯、聚酰亚胺和聚氨酯中的至少一种，和/或；
    所述压敏胶包括橡胶、硅胶、丙烯酸酯和聚氨酯中的至少一种。
  22. 一种电池，其特征在于，包括如权利要求1至21中任一项所述的卷芯。
PCT/CN2023/106640 2022-09-15 2023-07-10 一种卷芯及电池 WO2024055733A1 (zh)

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JP2005011699A (ja) * 2003-06-19 2005-01-13 Canon Inc リチウム二次電池
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CN205355186U (zh) * 2015-12-29 2016-06-29 宁德新能源科技有限公司 一种卷绕结构的电池
CN209709089U (zh) * 2019-05-31 2019-11-29 惠州市赛能电池有限公司 一种改善锂电池变形的负极片及不易变形的锂电池
CN214378500U (zh) * 2020-12-23 2021-10-08 珠海冠宇电池股份有限公司 一种电极片、卷绕式电芯和电池
CN217468544U (zh) * 2022-06-10 2022-09-20 珠海冠宇电池股份有限公司 一种卷绕电池和电子设备
CN218039281U (zh) * 2022-09-15 2022-12-13 珠海冠宇电池股份有限公司 一种负极片及电池
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* Cited by examiner, † Cited by third party
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JP2005011699A (ja) * 2003-06-19 2005-01-13 Canon Inc リチウム二次電池
JP2009134931A (ja) * 2007-11-29 2009-06-18 Nec Tokin Corp リチウムイオン電池及びその製造方法
CN205355186U (zh) * 2015-12-29 2016-06-29 宁德新能源科技有限公司 一种卷绕结构的电池
CN209709089U (zh) * 2019-05-31 2019-11-29 惠州市赛能电池有限公司 一种改善锂电池变形的负极片及不易变形的锂电池
CN214378500U (zh) * 2020-12-23 2021-10-08 珠海冠宇电池股份有限公司 一种电极片、卷绕式电芯和电池
CN217468544U (zh) * 2022-06-10 2022-09-20 珠海冠宇电池股份有限公司 一种卷绕电池和电子设备
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