WO2022246629A1 - 电池及电子装置 - Google Patents

电池及电子装置 Download PDF

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Publication number
WO2022246629A1
WO2022246629A1 PCT/CN2021/095685 CN2021095685W WO2022246629A1 WO 2022246629 A1 WO2022246629 A1 WO 2022246629A1 CN 2021095685 W CN2021095685 W CN 2021095685W WO 2022246629 A1 WO2022246629 A1 WO 2022246629A1
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WIPO (PCT)
Prior art keywords
conductive material
battery
layer
material layer
region
Prior art date
Application number
PCT/CN2021/095685
Other languages
English (en)
French (fr)
Inventor
董宇洋
闫东阳
曾巧
Original Assignee
宁德新能源科技有限公司
东莞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.)
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Application filed by 宁德新能源科技有限公司, 东莞新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to EP21942217.7A priority Critical patent/EP4343917A1/en
Priority to CN202180002880.4A priority patent/CN113906584B/zh
Priority to PCT/CN2021/095685 priority patent/WO2022246629A1/zh
Publication of WO2022246629A1 publication Critical patent/WO2022246629A1/zh
Priority to US18/192,934 priority patent/US20230290994A1/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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • 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
    • H01M4/04—Processes of manufacture in general
    • H01M4/0402—Methods of deposition of the material
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/362—Composites
    • H01M4/366—Composites as layered products
    • 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
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • 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
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/665—Composites
    • H01M4/667—Composites in the form of layers, e.g. coatings
    • 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
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M2004/026—Electrodes composed of, or comprising, active material characterised by the polarity
    • H01M2004/028—Positive electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of battery manufacturing, in particular to a battery and an electronic device.
  • terminal equipment that uses electric energy as a functional means is developing in the direction of mobility and portability.
  • battery manufacturers are strengthening their anti-drop performance in a targeted manner.
  • the length of the active material layer formed on the current collector tends to be longer and longer.
  • the stress problem caused between the active material layer and the current collector the active material layer may be peeled off from the current collector due to the stress, and at the same time, the surface of the negative electrode active material layer at the corner is prone to lithium precipitation, which is harmful to the battery. life span is affected.
  • An embodiment of the present application provides a battery, including a first electrical conductor and a first conductive material layer, the first electrical conductor includes a first surface and a second surface, the first surface and the second surface are the Two opposite surfaces of the first conductor; the first surface is provided on the first conductive material layer, the first conductive material layer includes a first recess, and the first conductor further includes a first region and the second region, the first region is separated from the second region, the first recess exposes the first region, the first conductive material layer exposes the second region, and the battery It also includes a first conductive plate, and in the second region, the first conductor is connected to the first conductive plate.
  • the first conductive material layer is provided with a first recess, the first recess is provided in the first region, the first conductive plate is provided in the second region, the second region is far away from the first region, and the first conductor It is connected with the first conductive plate located in the second area. Therefore, the first conductive plate is set away from the first concave part.
  • the first conductive body may be elongated, and the first conductive plate is far away from the first concave part to improve the first conductive The stress problem between the body and the first conductive material layer.
  • the first conductor includes a plurality of first regions.
  • the direction perpendicular to the surface of the first conductive material layer is a first direction
  • the first concave portion includes a first portion and a second portion whose extending distances are different from each other. two parts.
  • the first concave portion further includes a third portion, and the third portion is different from the first portion and the second portion in terms of extending distances. .
  • the direction perpendicular to the first direction is a third direction
  • the first length of the first part is equal to the second length of the second part
  • a third length of the third portion is different from the first length and the second length.
  • the first conductive material layer includes a plurality of first recesses, and along the third direction, the plurality of first recesses overlap.
  • the extending distance of the first concave portion ranges from 1 ⁇ m to 200 ⁇ m; when viewed along the first direction, the length of the first concave portion ranges from 0.5 mm to 5 mm .
  • the same first recess exposes multiple first regions at different positions.
  • the first conductor and the first conductive material layer are a winding structure including a plurality of first sections, and the first recess is provided in the first sections.
  • a direction perpendicular to a surface of the first conductive material layer is a first direction, and viewed along the first direction, the first region is surrounded by the first conductive material layer.
  • the battery further includes a first layer having an insulating material, and the first layer is connected to the first conductive material layer.
  • the direction perpendicular to the surface of the first conductive material layer is a first direction, and along the first direction, the distance of the first layer ranges from 5 ⁇ m to 30 ⁇ m.
  • the first layer is an adhesive layer.
  • the adhesive layer includes a base layer and an adhesive layer disposed on the base layer, the base layer includes polyethylene terephthalate, and the adhesive layer includes styrene-isoprene - Styrenic block copolymers.
  • the first conductor is a current collector.
  • the first conductor includes copper or aluminum.
  • the first conductive material layer is an active material layer.
  • the first conductive material layer includes lithium.
  • the battery further includes a second conductive material layer, the second conductive material layer is provided on the second surface, the second conductive material layer includes a second recess, and the first The conductor further includes a third region and a fourth region, the third region is separated from the fourth region, the second recess exposes the third region, and the second conductive layer material exposes the In the fourth area, the battery further includes a second conductive plate, and in the fourth area, the first electrical conductor is connected to the second conductive plate.
  • the first conductor includes a plurality of third regions.
  • the direction perpendicular to the surface of the second conductive material layer is a first direction, and along the first direction, the second recess includes a fourth portion and a fourth portion having different extending distances from each other. the fifth part.
  • the second recess further includes a sixth part, and the sixth part is different from the extending distances of the fourth part and the fifth part. same.
  • the direction perpendicular to the first direction is a third direction, and along the third direction, the fourth length of the fourth part and the fifth length of the fifth part different from each other.
  • the sixth length of the sixth portion is different from the fourth length and the fifth length.
  • the second conductive material layer includes a plurality of second recesses, and along the third direction, the plurality of second recesses overlap.
  • the distance of the second concave portion extends from 1 ⁇ m to 200 ⁇ m; when viewed along the first direction, the length of the second concave portion ranges from 0.5 mm to 5 mm .
  • the second conductive material layer is a winding structure including a plurality of first sections, and the second recess is provided in the first sections.
  • a direction perpendicular to a surface of the second conductive material layer is a first direction, and viewed along the first direction, the third region is surrounded by the first conductive material layer.
  • the battery further includes a first layer comprising an insulating material, and the first layer is connected to the second conductive material layer.
  • the direction perpendicular to the surface of the second conductive material layer is a first direction, and along the first direction, the distance of the first layer ranges from 5 ⁇ m to 30 ⁇ m.
  • the second conductive material layer is an active material layer.
  • the second conductive material layer includes lithium.
  • first recesses and the second recesses are arranged alternately.
  • the first conductor is a positive electrode conductor
  • the first conductive material layer is a positive electrode conductive material layer
  • Embodiments of the present application further provide an electronic device, the electronic device includes a body and the battery as described above, and the battery is accommodated in the body.
  • the first recess and the first conductive plate are respectively provided in the first area and the second area, so that the two are separated, and the first recess is provided in the first area, thereby reducing
  • the contact area between the first conductive material layer and the first conductor improves the stress problem between the first conductive layer and the first material layer, and improves the service life of the battery.
  • FIG. 1 is a schematic diagram of a three-dimensional structure of a battery in an embodiment provided in the present application.
  • FIG. 2 is a schematic perspective view of the three-dimensional structure of the electrode assembly in the battery shown in FIG. 1 .
  • FIG. 3 is a schematic cross-sectional view of the electrode assembly shown in FIG. 2 along the direction A-A.
  • FIG. 4 is a partially enlarged view of the electrode assembly shown in FIG. 3 .
  • Fig. 5 shows the arrangement of the expanded first conductor and the first conductive material layer.
  • FIG. 6 is a partially enlarged view of the arrangement of the expanded first conductor and the first conductive material layer shown in FIG. 5 .
  • FIG. 7 is a schematic cross-sectional view of the first conductor shown in FIG. 6 along the B-B square.
  • FIG. 8 is a schematic cross-sectional view of a battery provided with a first layer on the basis of FIG. 3 .
  • FIG. 9 is a schematic diagram of an electronic device in another embodiment of the present application.
  • the first area 113 The first area 113
  • An embodiment of the present application provides a battery, including a first electrical conductor and a first conductive material layer, the first electrical conductor includes a first surface and a second surface, the first surface and the second surface are the Two opposite surfaces of the first conductor, the first surface is provided on the first conductive material layer, the first conductive material layer includes a first recess, and the first conductor further includes a first region and the second region, the first region is separated from the second region, the first recess exposes the first region, the first conductive material layer exposes the second region, and the battery It also includes a first conductive plate, and in the second region, the first conductor is connected to the first conductive plate.
  • the first conductive material layer includes a first recess, the first recess is arranged in the first region, the first conductive plate is arranged in the second region, and between the second region and the first region Separately arranged, and the first conductor is connected to the first conductive plate arranged in the second area.
  • a first recess is provided on the first conductive material layer, thereby exposing the first conductive layer.
  • the first conductive material layer formed on the first conductive layer is provided with a first recess, thereby The contact area between the first conductive layer and the first conductive material layer is reduced, thereby reducing stress generated between the two, thereby improving battery life.
  • Fig. 1, Fig. 2 and Fig. 3. In order to better explain the structure of the battery 1, it will be described in conjunction with the X, Y, and Z coordinate axes, where the X, Y, and Z coordinate axes are perpendicular to each other.
  • the Z axis is the first direction
  • the X axis is the second direction
  • the Y axis is the third direction.
  • the direction perpendicular to the surface of the second section N is the first direction Z
  • the surface direction of the second section N is the X-Y direction
  • the cross-sectional direction of the electrode assembly 100 in FIG. 3 is the cross-sectional view of the Z-X direction. .
  • the present application provides a battery 1, the battery 1 includes an electrode assembly 100 and a casing 200, the casing 200 covers the electrode assembly 100, and the casing 200 is filled with electrolyte, so that the Battery 1 can be used normally. Setting the electrode assembly 100 in the casing 200 and injecting the electrolyte into the casing 200 is common in the field of battery 1 manufacturing, so details will not be repeated here.
  • the electrode assembly 100 includes a first pole piece 10, a diaphragm 20 and a second pole piece 30, and the diaphragm 20 is arranged between the first pole piece 10 and the second pole piece 30 for The first pole piece 10 and the second pole piece 30 are spaced apart to avoid contact between the two, which may cause a short circuit in the battery 1 .
  • the electrode assembly 100 can be formed by stacking the first pole piece 10 , the separator 20 and the second pole piece 30 . It can also be formed by winding between the first pole piece 10 , the separator 20 and the second pole piece 30 , and the two formation methods of the electrode assembly 100 are relatively common in the field of the battery 1 .
  • the first pole piece 10 is a positive pole piece
  • the second pole piece 30 is a negative pole piece.
  • the wound electrode assembly 100 is used for illustration.
  • the diaphragm 20 is represented by an incoherent dotted line in FIG. 3 . It should be noted that, in actual situations, the diaphragm 20 is a continuous structure.
  • the first pole piece 10 includes a first conductor 11 and a first conductive material layer 12 , and the first conductive material layer 12 is disposed on the first conductor 11 .
  • the first conductor 11 includes a first surface 111 and a second surface 112 opposite to the first surface 111 , and the first conductive material layer 12 is disposed on the first surface 111 .
  • the first conductor 11 also includes a first region 113 exposed from the first conductive material layer and a second region 114 provided with the first conductive plate 40, the second region 114 is connected to the first The regions 113 are separated, wherein the distance between the first region 113 and the second region 114 can be set as required. For example, taking the wound electrode assembly 100 for illustration, when the first region 113 is disposed on the sub-outer ring far away from the center of the electrode assembly 100, the second region 114 can be disposed close to the sub-outer ring Further, the second region 114 can also be set at the fourth circle position close to the center of the electrode assembly 100 .
  • the first conductor 11 is provided with the first region 113 and the second region 114 on the first surface 111 .
  • the first conductor 11 includes a plurality of first regions 113, for example, at the first end a of the first conductor 11, or at the first end a of the first conductor 11. Both ends b are provided with the first region 113 .
  • the first end a corresponding to the first conductive material layer 12 is the position of the inner layer of the wound electrode assembly 100
  • the second end b corresponding to the first conductive material layer 12 is the wound electrode assembly 100 at the outer position.
  • the first conductive material layer 12 includes a first concave portion 121, further, the surface of the first conductive material layer 12 away from the first surface 111 includes a first concave portion 121, and the first concave portion 121 is the first concave portion 121.
  • a conductive material layer 12 is recessed from a surface away from the first surface 111 toward a direction close to the first surface 111 .
  • the first recess 121 exposes the first region 113
  • the first conductive material layer 12 exposes the second region 114 . That is, the first conductive material layer 12 located in the first region 113 exposes the first region 113 through the first recess 121 , and the first conductive material layer 12 located in the second region 114 exposes the first region 113 .
  • Second area 114 It can be understood that, viewed along the first direction Z, the first conductor 11 can be seen at the first region 113 , and the first conductor 11 can also be seen at the second region 114 .
  • the meaning of "exposed” here only means that the first conductive material layer 12 is exposed from the first region 113, and it does not mean that after the electrode assembly 100 is loaded into the casing 200, the electrolyte and the first The negation of the abutment of the regions 113 does not negate the possible coverage of other parts of the first region 113 when the electrode assembly 100 is wound.
  • the first conductive material layer 12 includes a plurality of first recesses 121, and the plurality of first recesses 121 are arranged at different positions, and the shapes, sizes and depths of the plurality of recesses are different. . Further, the same first concave portion 121 can reveal multiple first regions 113 at different positions, that is, the area formed by one of the multiple first concave portions 121 is different from that of other first concave portions 121 , the first region 113 at multiple positions can be revealed according to its area. It can be understood that, among the plurality of first recesses 121, some of the first recesses 121 expose the first region 113, and there are also cases where the first recesses 121 do not reveal the first region 113. When the first recess 121 where the first region 113 is not exposed is close to the first conductor 11 , the stress between the first conductor 11 and the first conductive material layer 12 can also be improved.
  • the first conductor 11 and the first conductive material layer 12 form a winding structure including a plurality of first sections M and second sections N, the The second section N is connected to the first section M, and the dividing line O is used as the dividing position. Further, the electrode assembly 100 is closest to the battery along the second direction X in the part of the winding back fold. A vertical line perpendicular to this end is introduced into the folded end of the center of 1, and the boundary line O overlapping with this vertical line is the boundary position between the first section M and the second section N.
  • FIG. 3 the first conductor 11 and the first conductive material layer 12 form a winding structure including a plurality of first sections M and second sections N, the The second section N is connected to the first section M, and the dividing line O is used as the dividing position.
  • the electrode assembly 100 is closest to the battery along the second direction X in the part of the winding back fold. A vertical line perpendicular to this end is introduced into the folded end of the center of 1, and the boundary line O overlapping
  • the part closer to the center of the battery 1 than the above-mentioned boundary line O is the second section N, and further, the straight line part is the second section N, and the second section N is along the second direction X set up.
  • the part farther from the center of the battery 1 than the above-mentioned boundary line O is the first section M, and the first section M is connected to the second section N.
  • the first section M is a part formed by turning back in the wound electrode assembly.
  • the first concave portion 121 is disposed at the position of the first section M.
  • the first recess 121 When the first recess 121 is provided at the position of the first section M, the first recess 121 provided on the first section M is viewed along the second direction X, and the cross section of the first recess 121 is circular. shape. It can be understood that, in other embodiments, the cross-section of the first concave portion 121 may also be arc-shaped, rectangular, triangular, star-shaped, elliptical, or irregular.
  • the first recess 121 By arranging the first recess 121 at the second section N, the infiltration of the electrolyte at the corner of the battery 1 can be improved. At the same time, the presence of the first recess 121 can improve the retention of the electrolyte at the corner of the battery 1, thereby improving the corner of the battery 1. Kinetics, improving the situation of lithium precipitation at the corner position.
  • the first concave portion 121 can also be provided at the position of the second section N.
  • FIG. 5 where the coordinate direction in FIG. 3 is the direction under the coiled structure of the electrode assembly 100 .
  • X 1 , Y 1 The Z 1 coordinate axis is used to describe it, wherein, the X 1 , Y 1 , and Z 1 coordinate axes are perpendicular to each other.
  • the Z 1 axis is the first direction
  • the X 1 axis is the second direction
  • the Y 1 axis is the third direction.
  • the direction extending from the second end b to the first end a is X 1
  • the direction perpendicular to X 1 and arranged along the first concave portion 121 is Y 1
  • Y 1 is the same direction as Y
  • Z 1 is a direction perpendicular to the plane formed by X 1 and Y 1 .
  • the hatched part in the figure is the area where the first conductive material layer 12 is provided, and the first conductive material layer 12 includes a plurality of first recesses 121, along the second direction X1 and the third direction Y 1 , a plurality of the first recesses 121 overlap to further reduce the contact area between the first conductor 11 and the first conductive material layer 12 and improve the contact area between the two. stress problem.
  • the plurality of first recesses 121 may be divided into recess one 121a, recess two 121b, recess three 121c, recess four 121d and recess five 121e.
  • the shapes of the first recess 121a, the second recess 121b, the third recess 121c, the fourth recess 121d, and the fifth recess 121e may be different.
  • FIG. 6 shows the unfolded situation of the first pole piece 10 at the position of the first section M in FIG. 3
  • FIG. 7 is a schematic cross-sectional view along the BB direction of FIG. 6 .
  • the first concave portion 121 exposes the first region 113 , and further, the first concave portion 121 may also reveal another first region 113 close to the first region 113 , that is, a first concave portion 121 Two or more first regions 113 may be exposed.
  • the first direction Z 1 at least a part of the plurality of first recesses 121 overlaps in the third direction Y 1 , and the first recesses 121 overlap in the second direction X 1 and the first The three directions Y1 have different lengths respectively.
  • the first recess 121 includes a first portion 1211 and a second portion 1212 with different extending distances.
  • the first portion 1211 and the second portion 1212 extend from the surface of the first conductive material layer 12 away from the first surface 111 toward the first surface 111 .
  • the first portion 1211 extends above the center of the first conductive material layer 12
  • the second portion 1212 extends to the center of the first conductive material layer 12 the following.
  • the distance that the first recess 121 extends ranges from 1 ⁇ m to 200 ⁇ m.
  • the distance that the first part 1211 extends is H1
  • the distance that the second part 1212 extends is H2 .
  • the distance that H2 extends is greater than the distance that H1 extends.
  • H1 is 60 ⁇ m
  • H2 is 130 ⁇ m.
  • the first concave portion 121 further includes a third portion 1213, and along the first direction Z 1 , the third portion 1213 faces from the surface of the first conductive material layer 12 away from the first surface 111 toward the first One side 111 extends, the third portion 1213 extends to expose the first region 113, and the distance extended by the third portion 1213 is equal to the distance extended by the first portion 1211 and the second portion 1212 Are not the same.
  • the distance extended by the third portion 1213 is H 3 , for example, the distance extended by H 3 is greater than the distance extended by H 1 and H 2 , further, H 3 is 200 ⁇ m.
  • the above-mentioned extending distances of the first portion 1211 , the second portion 1212 and the third portion 1213 are only for illustration. In other embodiments, the distances extended by the first portion 1211 , the second portion 1212 and the third portion 1213 are not limited thereto. Further, there is also a situation that the first concave portion 121 further includes another portion 1214 , and the distance extending along the first direction Z 1 of the other portion 1214 is greater than H 1 and H 2 , and less than the distance H 3 extends.
  • the third recess 121c includes the first part 1211 , the second part 1212 , the third part 1213 and other parts 1214 at the same time.
  • the first length L 1 of the first portion 1211 is different from the second length L 2 of the second portion 1212 and the third length L 3 of the third portion 1213 . That is, along the third direction Y 1 , the distances extended by the first portion 1211 , the second portion 1212 and the third portion 1213 are different. Further, viewed along the first direction Z1 , the length of the first recess 121 ranges from 0.5mm to 5mm. For example, the length L 1 of the first portion 1211 is 1 mm, the length L 2 of the second portion 1212 is 1.5 mm, and the length L 3 of the third portion 1213 is 3 mm.
  • first portion 1211 , the second portion 1212 and the third portion 1213 are only for illustration of distances. In other embodiments, the extended lengths of the first portion 1211, the second portion 1212 and the third portion 1213 are not limited thereto.
  • the first region 113 is surrounded by the first conductive material layer 12, so that the electrolyte is stored in the first region 113, and the temperature at this position is increased.
  • Kinetics improving the situation of lithium precipitation on the surface of the negative electrode conductive material layer corresponding to this position. That is, the first conductor 11 can be observed from the first region 113, and the contact area between the first conductive material layer 12 and the first conductor 11 is reduced, thereby reducing the first
  • the stress suffered by the conductive material layer 12 improves the peeling of the first conductive material layer 12 from the first conductor 11 .
  • the first conductor 11 is a current collector, and the first conductor 11 includes copper or aluminum. It can be understood that, in other embodiments, the material contained in the first conductor 11 is not limited thereto.
  • the first conductive material layer 12 is an active material layer, and the first conductive material layer 12 includes lithium. It can be understood that, in other embodiments, the material contained in the first conductive material layer 12 is not limited thereto.
  • the first conductor 11 is a positive conductor
  • the first conductive material layer 12 is a positive conductive material layer.
  • the battery 1 further includes a first conductive plate 40 disposed at the position of the second section N.
  • the first conductor 11 is connected to the first conductive plate 40 .
  • the first conductive plate 40 is arranged in the second region 114, so that the first conductive plate 40 is separated from the first region 113, that is, the first conductive plate 40 is away from the first A recess 121 is provided.
  • the mutual position between the first conductor 11 and the first conductive material layer 12 changes, due to the temperature change, the mutual position between the first conductor 11 and the first conductive material layer 12 changes, The first recess 121 exposes the first region 113, and the first conductive material layer 12 reduces the contact area with the first conductor 11, thereby improving the contact area between the first conductor 11 and the first conductor 11.
  • the stress problem between the first conductive material layer 12 is described above.
  • the first conductive plate 40 is a tab, and the tab can be disposed on the current collector by bonding.
  • the first conductive plate 40 can also be disposed on the first conductor 11 in other ways, such as welding.
  • the first conductive plate 40 and the first conductor 11 may be integrally formed.
  • the battery 1 further includes a first layer 60 of insulating material, and the first layer 60 is connected to the first conductive material layer 12 .
  • the distance of the first layer 60 ranges from 5 ⁇ m to 30 ⁇ m, that is, the thickness of the first layer 60 ranges from 5 ⁇ m to 30 ⁇ m.
  • the thickness of the first layer 60 is 15 ⁇ m, 20 ⁇ m or 25 ⁇ m.
  • part of the first layer 60 is in contact with the first conductive material layer 12 located in the first region 113 , and another part of the first layer 60 is in contact with the exposed first conductor 11 connect.
  • the first layer 60 With the first layer 60 in contact with the first conductive material layer 12, when the battery 1 is hit or dropped, the first layer 60 can limit the relative movement of the first conductive material layer 12.
  • the first conductor 11 moves to keep the thicknesses of the first pole piece 10 and the second pole piece 30 consistent along the first direction Z, thereby improving the safety performance of the battery 1 .
  • the first layer 60 can also be connected to the first conductive material layer 12 located in the second region 114, so as to enhance the connection between the first conductive body 11 and the first The stability of the conductive material layer 12.
  • the first layer 60 is an adhesive layer.
  • the adhesive layer includes a base layer and an adhesive layer disposed on the base layer, and the adhesive layer is viscous so that the first layer can be bonded to the first pole piece 10 .
  • the material for making the base layer includes polyolefin, polyacrylonitrile, polyol ester, polyamide, polyurethane, and a compound containing at least one of polyolefin, polyacrylonitrile, polyol ester, polyamide, and polyurethane.
  • the material of the adhesive layer includes polyolefin, polyurethane, polyacrylate, silicone, rubber, and a compound containing at least one of polyolefin, polyurethane, polyacrylate, silicone, and rubber.
  • the adhesive layer is adhesive paper. It can be understood that, in other embodiments, the first layer 60 can also be replaced with other structures having equivalent functions or functions.
  • the materials included in the base layer and the adhesive layer are not limited thereto.
  • the first conductor 11 also includes a third region 115 and a fourth region 116 provided with a second conductive plate (not shown), the fourth region 116 and the third The regions 115 are separated, wherein, the distance between the third region 115 and the fourth region 116 can be set as required.
  • the fourth region 116 can be disposed close to the sub-outer circle
  • the fourth region 116 can also be set at the fourth circle position close to the center of the electrode assembly 100 .
  • the first conductor 11 is provided with the third region 115 and the fourth region 116 on the second surface 112 .
  • the first electrical conductor 11 includes a plurality of third regions 115, for example, at the third end c of the first electrical conductor 11, or at the third end c of the first electrical conductor 11. Each of the four ends d is provided with the third region 115 .
  • the battery 1 further includes a second conductive material layer 13, the second conductive material layer 13 is disposed on the second surface 112, and the second conductive material layer 13 includes a second concave portion 131, further, the The surface of the second conductive material layer 13 facing away from the second surface 112 includes a second concave portion 131, and the second concave portion 131 is from the surface of the second conductive material layer 13 facing away from the second surface 112 toward the The direction of the second surface 112 is concave.
  • the second recess 131 exposes the third region 115
  • the second conductive material layer 13 exposes the fourth region 116 . That is, the second conductive material layer 13 located in the third region 115 exposes the third region 115 through the second recess 131 , and the second conductive material layer 13 located in the fourth region 116 exposes the first Four area 116. It can be understood that, viewed along the first direction Z, the first conductor 11 can be seen at the third region 115 , and the first conductor 11 can also be seen at the fourth region 116 .
  • the meaning of "exposed” here only means that the second conductive material layer 13 is exposed from the third region 115, and it does not mean that after the electrode assembly 100 is loaded into the casing 200, the electrolyte and the third The negation of the abutment of the regions 115 does not negate the possibility of covering the third region 115 by other parts when the electrode assembly 100 is wound.
  • the second conductive material layer 13 includes a plurality of second recesses 131, and a plurality of second recesses 131 are arranged at different positions, and their shape, size and depth There are different situations.
  • the plurality of second recesses 131 can be divided into six recesses 131a, seven recesses 131b, eight recesses 131c, nine recesses 131d and ten recesses 131e.
  • the shapes of the six recesses 131a, seven recesses 131b, eight recesses 131c, nine recesses 131d, and ten recesses 131e may be different.
  • the same second concave portion 131 can reveal multiple third regions 115 at different positions, that is, the area formed by one of the multiple second concave portions 131 is different from that of other second concave portions 131 , the third region 115 at a plurality of positions can be revealed according to its area. It can be understood that some of the plurality of second recesses 131 do not expose the third region 115 , and when the second recesses 131 of the third region 115 that are not exposed are close to the first conductor 11 , The stress between the first conductive body 11 and the second conductive material layer 13 can also be improved. Along the first direction Z 1 , at least a part of the plurality of second recesses 131 overlaps in the third direction Y 1 .
  • the second recess 131 is disposed at the position of the first section M in the winding structure.
  • the second concave portion 131 can also be disposed at the position of the second section N. Moreover, the shape of the second concave portion 131 is substantially the same as that of the first concave portion 121, wherein “substantially the same” should be understood to include the same shape and similar shapes.
  • the second concave portion 131 includes a fourth portion 1311 and a fifth portion 1312 with different extending distances.
  • the fourth portion 1311 and the fifth portion 1312 extend from the surface of the second conductive material layer 13 away from the second surface 112 toward the second surface 112 .
  • the fourth portion 1311 extends below the center of the second conductive material layer 13
  • the fifth portion 1312 extends to the center of the second conductive material layer 13
  • the first surface 111 and the second surface 112 are two opposite surfaces, and the situation of the extension of the first concave portion 121 and the second concave portion 131 is reversed.
  • the second concave portion 131 extends a distance ranging from 1 ⁇ m to 200 ⁇ m.
  • the fourth portion 1311 extends a distance of H 4
  • the fifth portion 1312 extends a distance of H 5 , for example, the distance H 5 extends is greater than the distance H 4 extends, further, H 4 is 50 ⁇ m, and H 5 is 140 ⁇ m.
  • the second concave portion 131 further includes a sixth portion 1313, and along the first direction Z 1 , the sixth portion 1313 is directed from the surface of the second conductive material layer 13 away from the second surface 112 toward the first
  • the two surfaces 112 extend, the sixth portion 1313 extends to reveal the third region 115 , and the distance extended by the sixth portion is the same as that extended by the fourth portion 1311 and the fifth portion 1312
  • the distances are different from each other.
  • the distance extended by the sixth portion 1313 is H 6 , for example, the distance extended by H 6 is greater than the distance extended by H 4 and H 5 , further, H 6 is 200 ⁇ m.
  • the above-mentioned distances extended by the fourth portion 1311 , the fifth portion 1312 and the sixth portion 1313 are only for illustration. In other embodiments, the distances extended by the fourth portion 1311 , the fifth portion 1312 and the sixth portion 1313 are not limited thereto. Further, there is also a situation that the second concave portion 131 further includes another portion 1314 , and the distance extending along the first direction Z 1 of the other portion 1314 is greater than the distance H 4 and H 5 , and less than the distance H 6 extends.
  • the concave part 8 131c includes the fourth part 1311 , the fifth part 1312 , the sixth part 1313 and other parts 1314 at the same time.
  • the fourth length L 4 of the fourth portion 1311 is different from the fifth length L 5 of the fifth portion 1312 and the sixth length L 6 of the sixth portion 1313 . That is, along the third direction Y 1 , the distances extended by the fourth portion 1311 , the fifth portion 1312 and the sixth portion 1313 are different. Further, viewed along the first direction Z1 , the length of the second recess 131 ranges from 0.5mm to 5mm. For example, the length L 4 of the fourth portion 1311 is 1.5 mm, the length L 5 of the fifth portion 1312 is 2.5 mm, and the length L 6 of the sixth portion 1313 is 3.5 mm.
  • the above-mentioned lengths of the fourth portion 1311 , the fifth portion 1312 and the sixth portion 1313 are only for illustration of distances. In other embodiments, the extended lengths of the fourth portion 1311 , the fifth portion 1312 and the sixth portion 1313 are not limited thereto.
  • the third region 115 is surrounded by the second conductive material layer 13, so that the electrolyte is stored in the third region 115, and the temperature at this position is increased.
  • Kinetics improving the situation of lithium precipitation on the surface of the negative electrode conductive material layer corresponding to this position. That is, the first conductor 11 can be observed from the third region 115, and the contact area between the second conductive material layer 13 and the first conductor 11 is reduced, thereby reducing the second The stress suffered by the conductive material layer 13 improves the peeling of the second conductive material layer 13 from the first conductor 11 .
  • the second conductive material layer 13 is an active material layer, and the second conductive material layer 13 includes lithium. It can be understood that, in other embodiments, the material contained in the second conductive material layer 13 is not limited thereto.
  • the battery 1 further includes a second conductive plate, and the second conductive plate is arranged at the position of the second section N.
  • the first conductor 11 is connected to the second conductor plate.
  • the second conductive plate is arranged in the fourth area 116, so that the second conductive plate is separated from the third area 115, that is, the second conductive plate is away from the second recess 131 way to set.
  • the second recess 131 exposes the third region 115, and the second conductive material layer 13 reduces the contact area with the first conductor 11, thereby improving the connection between the first conductor 11 and the first conductor 11.
  • the stress problem between the second conductive material layer 13 is described above.
  • the second conductive plate is a tab, and the tab can be arranged on the current collector by bonding.
  • the second conductive plate can also be disposed on the first conductor 11 in other ways, such as welding.
  • the second conductive plate and the first conductive body 11 may be integrally formed.
  • One of the first conductive plate 40 and the second conductive plate can be selected to be connected to the first conductor 11, so as to realize the connection between the tab and the current collector, or, in another embodiment, in the The first conductive plate 40 and the second conductive plate are connected to the first conductive body 11 at the same time.
  • the first layer 60 included in the battery 1 is also connected to the second conductive material layer 13, when the first conductive material layer 12 and the second conductive material layer are simultaneously provided on the first conductor 11 13, the first layer 60 is connected to the first conductive material layer 12 and the second conductive material layer 13 at the same time. Further, part of the first layer 60 is in contact with the second conductive material layer 13 located in the third region 115 , and another part of the first layer 60 is connected with the exposed first conductor 11 .
  • the first layer 60 can also be connected to the first conductive material layer 12 located in the fourth region 116, so as to enhance the connection between the first conductive body 11 and the second Stability of the conductive material layer 13 .
  • the first conductive material layer 12 forms a step with the conductive material layer on the second pole piece 30, when the first layer 60 and the first conductive material layer
  • the first layer 60 can fill the formed step, so that along the first direction Z, the first pole piece 10 and the second pole piece 30 of the first layer 60 are arranged
  • the overall thickness is the same as that of the first pole piece 10 and the second pole piece 30 that are not provided with the first layer 60, which reduces the first pole piece 10 that may appear when the battery 1 is hit or dropped. Relative movement occurs between the second pole piece 30 .
  • the first recesses 121 and the second recesses 131 are alternately arranged, wherein a dotted line is used as a boundary.
  • the stress between the first conductor 11 and the first conductive material layer 12 and the second conductive material layer 13 can also be improved. question.
  • the first direction Z 1 there is still an overlapping place between the first concave portion 121 and the second concave portion 131 , specifically, as shown by the thin dot-dash line in the figure.
  • the thin dot-dash line shown in FIG. 7 is used as the boundary position to improve the stress problem at the position of the first conductor 11 corresponding to the first concave portion 121 and the second concave portion 131 .
  • the structure of the second pole piece 30 is substantially the same as the structure of the first pole piece 10, wherein, "substantially” should be understood as not completely the same, and also includes the first pole piece 10 and the second pole piece 10. There are instances of slight differences between the pole pieces 30 .
  • the second pole piece 30 is provided with a third conductive plate 50, the specific structure and connection relationship between the third conductive plate 50 and the second pole piece 30 can refer to the first pole piece 10 and the content of the first conductive plate 40 will not be repeated here.
  • the embodiment of the present application also provides an electronic device 5, the electronic device 5 includes a body 300 and the battery 1 as described in any one of the above embodiments, the battery 1 is housed in the body Within 300.
  • the electronic device 5 can be one of a mobile phone, a tablet, and an electronic reader.
  • the electronic device 5 includes any one of the above-mentioned batteries 1 , and thus has all the beneficial effects of the battery 1 , which will not be repeated here.
  • the electronic device 5 described in this application takes a mobile phone as an example.
  • the battery 1 is arranged in the mobile phone to provide power for the mobile phone to use.
  • the main body 300 is a mobile phone structure. It can be understood that, in other embodiments, the electronic device 5 can also have other structures, not limited to the above-mentioned mobile phone, tablet, and electronic reader.
  • the first conductor 11 includes a first region 113 and a second region 114, and the first conductive material
  • the layer 12 is disposed on the first conductor 11, and the first conductive material layer 12 includes a first recess 121, the first recess 121 exposes the first region 113, and the first conductive material layer 12 reveals the second region 114 , the first conductive plate 40 is disposed on the second region 114 and connected to the first conductor 11 .
  • the first conductor 11 is elongated, the first conductive plate 40 is kept away from the first region 113, which can improve the performance of the first conductor 11 and the first conductive material layer. 12 Stress issues between.

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Abstract

本申请提供一种电池(1)，包括第一导电体(11)和第一导电材料层(12)，第一导电体(11)包括第一面(111)和第二面(112)，第一面(111)和第二面(112)为第一导电体(11)相对设置的两个面；第一面(111)设有第一导电材料层(12)，第一导电材料层(12)包括第一凹部(121)，第一导电体(11)还包括第一区域(113)和第二区域(114)，第一区域(113)和第二区域(114)之间存在第一预设间距，第一凹部(121)显露出第一区域(113)，第一导电材料层(12)显露出第二区域(114)，电池(1)还包括第一导电板(40)，在第二区域(114)，第一导电体(11)和第一导电板(40)连接。本申请还涉及一种电子装置(5)，通过采用上述的电池(1)，能够改善第一导电体(11)和第一导电材料层(12)之间的应力问题，提升电池的寿命。

Description

电池及电子装置 技术领域
本申请涉及电池制造技术领域，尤其涉及一种电池及电子装置。
背景技术
当前以电能为功能手段的终端设备，正往可移动、可携带的方向发展。目前电池制造商有针对性地强化其抗跌落性能，在制备电池的过程中，将活性物质层设于集流体表面上时，因集流体上形成的活性物质层长度越来越长的倾向而造成的活性物质层与集流体之间产生的应力问题，活性物质层因为应力的作用可能出现从集流体上剥离的情况，同时位于拐角处的负极活性物质层表面容易出现析锂，从而对电池的寿命造成影响。
发明内容
有鉴于此，有必要提供一种电池及电子装置，旨在优化电极组件中极片的形貌，改善第一导电体和第一导电材料层之间的应力问题，进而提升电池的寿命。
本申请的实施例提供一种电池，包括第一导电体和第一导电材料层，所述第一导电体包括第一面和第二面，所述第一面和所述第二面为所述第一导电体相对设置的两个面；所述第一面设于所述第一导电材料层，所述第一导电材料层包括第一凹部，所述第一导电体还包括第一区域和第二区域，所述第一区域和所述第二区域相分离，所述第一凹部显露出所述第一区域，所述第一导电材料层显露出所述第二区域，所述电池还包括第一导电板，在所述第二区域，所述第一导电体和所述第一导电板连接。
通过采用上述的电池，第一导电材料层设置第一凹部，将第一凹部设于第一区域，将第一导电板设于第二区域，第二区域远离第一区域，且第一导电体和设于第二区域的第一导电板连接。从而将第一导电板以离开第一凹部的方式设置，当电池发生撞击、跌落等情况时，第一导电体可能出现被拉长的情况，第一导电板远离第一凹部，改善第一导电体与第一导电材料层之间的应力问题。
一种可能实现的方式中，所述第一导电体包括多个所述第一区域。
一种可能实现的方式中，沿与所述第一导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第一凹部包括延伸距离互不相同的第一部分和第二部分。
一种可能实现的方式中，沿所述第一方向，所述第一凹部还包括第三部分，所述第三部分与所述第一部分和所述第二部分所述延伸的距离互不相同。
一种可能实现的方式中，沿与所述第一方向所垂直的方向为第三方向，沿所述第三方向，所述第一部分的第一长度与所述第二部分的第二长度互不相同。
一种可能实现的方式中，沿所述第三方向，所述第三部分的第三长度与所述第一长度和所述第二长度互不相同。
一种可能实现的方式中，所述第一导电材料层包括多个所述第一凹部，沿所述第三方向， 多个所述第一凹部重叠。
一种可能实现的方式中，沿所述第一方向，所述第一凹部延伸的距离范围为1μm至200μm；沿所述第一方向观察，所述第一凹部的长度范围为0.5mm至5mm。
一种可能实现的方式中，同一所述第一凹部显露出多个不同位置的所述第一区域。
一种可能实现的方式中，所述第一导电体和所述第一导电材料层为包括多个第一区部的卷绕结构，所述第一凹部设于所述第一区部。
一种可能实现的方式中，沿与所述第一导电材料层表面所垂直的方向为第一方向，沿所述第一方向观察，所述第一区域被所述第一导电材料层围绕。
一种可能实现的方式中，所述电池还包括具有绝缘材料的第一层，所述第一层与所述第一导电材料层连接。
一种可能实现的方式中，沿与所述第一导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第一层的距离范围为5μm至30μm。
一种可能实现的方式中，所述第一层为粘接层。
一种可能实现的方式中，所述粘接层包括基层和设于所述基层的胶层，所述基层包括聚对苯二甲酸乙二酯，所述胶层包括苯乙烯-异戊二烯-苯乙烯嵌段共聚物。
一种可能实现的方式中，所述第一导电体为集流体。
一种可能实现的方式中，所述第一导电体包含铜或者铝。
一种可能实现的方式中，所述第一导电材料层为活性物质层。
一种可能实现的方式中，所述第一导电材料层包括锂。
一种可能实现的方式中，所述电池还包括第二导电材料层，所述第二导电材料层设于所述第二面，所述第二导电材料层包括第二凹部，所述第一导电体还包括第三区域和第四区域，所述第三区域和所述第四区域相分离，所述第二凹部显露出所述第三区域，所述第二导电层材料显露出所述第四区域，所述电池还包括第二导电板，在所述第四区域，所述第一导电体和所述第二导电板连接。
一种可能实现的方式中，所述第一导电体包括多个所述第三区域。
一种可能实现的方式中，沿与所述第二导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第二凹部包括延伸距离互不相同的第四部分和第五部分。
一种可能实现的方式中，沿所述第一方向，所述第二凹部还包括第六部分，所述第六部分与所述第四部分和所述第五部分所述延伸的距离互不相同。
一种可能实现的方式中，沿与所述第一方向所垂直的方向为第三方向，沿所述第三方向，所述第四部分的第四长度与所述第五部分的第五长度互不相同。
一种可能实现的方式中，沿所述第三方向观察，所述第六部分的第六长度与所述第四长度和所述第五长度互不相同。
一种可能实现的方式中，所述第二导电材料层包括多个所述第二凹部，沿所述第三方向，多个所述第二凹部重叠。
一种可能实现的方式中，沿所述第一方向，所述第二凹部延伸的距离范围为1μm至200μm；沿所述第一方向观察，所述第二凹部的长度范围为0.5mm至5mm。
一种可能实现的方式中，所述第二导电材料层为包括多个第一区部的卷绕结构，所述第 二凹部设于所述第一区部。
一种可能实现的方式中，沿与所述第二导电材料层表面所垂直的方向为第一方向，沿所述第一方向观察，所述第三区域被所述第一导电材料层围绕。
一种可能实现的方式中，所述电池还包括具有绝缘材料的第一层，所述第一层与所述第二导电材料层连接。
一种可能实现的方式中，沿与所述第二导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第一层的距离范围为5μm至30μm。
一种可能实现的方式中，所述第二导电材料层为活性物质层。
一种可能实现的方式中，所述第二导电材料层包括锂。
一种可能实现的方式中，所述第一凹部和所述第二凹部交错设置。
一种可能实现的方式中，所述第一导电体为正极导电体，所述第一导电材料层为正极导电材料层。
本申请的实施例还提供一种电子装置，所述电子装置包括本体和如上述中任一所述的电池，所述电池收容于所述本体内。
本申请提供的电池及电池装置，通过将第一凹部和第一导电板分别设于第一区域和第二区域，使得二者之间分离开，并且在第一区域设置第一凹部，从而减少第一导电材料层与第一导电体所接触的面积，改善了第一导电层与第一材料层之间的应力问题，提升了电池的使用寿命。
附图说明
图1为本申请提供的实施例中电池的立体结构示意图。
图2为图1所示的电池中电极组件的立体结构示意图。
图3为图2所示的电极组件沿A-A方向的剖视示意图。
图4为图3所示的电极组件的局部放大图。
图5为展开的第一导电体和第一导电材料层的设置情况。
图6为图5所示的展开的第一导电体和第一导电材料层的设置情况的部分放大图。
图7为图6所示的第一导电体沿B-B方形的剖视示意图。
图8为在图3的基础上所示的电池设有第一层的剖视示意图。
图9为本申请另一实施例中电子装置的示意图。
主要元件符号说明
电池                       1
电极组件                   100
第一极片                   10
第一导电体                 11
第一面                     111
第二面                     112
第一区域                   113
第二区域                   114
第三区域                   115
第四区域                   116
第一导电材料层             12
第一端                     a
第二端                     b
第一凹部                   121
凹部一                     121a
凹部二                     121b
凹部三                     121c
凹部四                     121d
凹部五                     121e
第一部分                   1211
第二部分                   1212
第三部分                   1213
第二导电材料层             13
第三端                     c
第四端                     d
第二凹部                   131
凹部六                     131a
凹部七                     131b
凹部八                     131c
凹部九                     131d
凹部十                     131e
第四部分                   1311
第五部分                   1312
第六部分                   1313
其他部分                   1214、1314
隔膜                       20
第二极片                   30
第一导电板                 40
第三导电板                 50
第一层                     60
第一区部                   M
第二区部                   N
分界线                     O
壳体                       200
电子装置                   5
本体     300
具体实施方式
下面对本申请实施例中的技术方案进行清楚、详细地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同。在本申请的说明书中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请。
下文，将详细地描述本申请的实施方式。但是，本申请可体现为许多不同的形式，并且不应解释为限于本文阐释的示例性实施方式。而是，提供这些示例性实施方式，从而使本申请透彻的和详细的向本领域技术人员传达。
另外，为了简洁和清楚，在附图中，各种组件、层的尺寸或厚度可被放大。遍及全文，相同的数值指相同的要素。如本文所使用，术语“及/或”、“以及/或者”包括一个或多个相关列举项目的任何和所有组合。另外，应当理解，当要素A被称为“连接”要素B时，要素A可直接连接至要素B，或可能存在中间要素C并且要素A和要素B可彼此间接连接。
进一步，当描述本申请的实施方式时使用“可”指“本申请的一个或多个实施方式”。
本文使用的专业术语是为了描述具体实施方式的目的并且不旨在限制本申请。如本文所使用，单数形式旨在也包括复数形式，除非上下文另外明确指出。应进一步理解，术语“包括”，当在本说明书中使用时，指存在叙述的特征、数值、步骤、操作、要素和/或组分，但是不排除存在或增加一个或多个其他特征、数值、步骤、操作、要素、组分和/或其组合。
空间相关术语，比如“上”等可在本文用于方便描述，以描述如图中阐释的一个要素或特征与另一要素(多个要素)或特征(多个特征)的关系。应理解，除了图中描述的方向之外，空间相关术语旨在包括设备或装置在使用或操作中的不同方向。例如，如果将图中的设备翻转，则描述为在其他要素或特征“上方”或“上”的要素将定向在其他要素或特征的“下方”或“下面”。因此，示例性术语“上”可包括上面和下面的方向。应理解，尽管术语第一、第二、第三等可在本文用于描述各种要素、组分、区域、层和/或部分，但是这些要素、组分、区域、层和/或部分不应受这些术语的限制。这些术语用于区分一个要素、组分、区域、层或部分与另一要素、组分、区域、层或部分。因此，下面讨论的第一要素、组分、区域、层或部分可称为第二要素、组分、区域、层或部分，而不背离示例性实施方式的教导。
本申请的实施例提供一种电池，包括第一导电体和第一导电材料层，所述第一导电体包括第一面和第二面，所述第一面和所述第二面为所述第一导电体相对设置的两个面，所述第一面设于所述第一导电材料层，所述第一导电材料层包括第一凹部，所述第一导电体还包括第一区域和第二区域，所述第一区域和所述第二区域相分离，所述第一凹部显露出所述第一区域，所述第一导电材料层显露出所述第二区域，所述电池还包括第一导电板，在所述第二区域，所述第一导电体和所述第一导电板连接。
采用上述的电池，所述第一导电材料层包括第一凹部，所述第一凹部设于所述第一区域，将第一导电板设于第二区域，第二区域与第一区域之间分离设置，且第一导电体和设于第二区域的第一导电板连接。在第一导电材料层上设有第一凹部，从而显露出第一导电层，例如，在卷绕形电池中，因第一导电层上形成的第一导电材料层设有第一凹部，从而减少第一导电 层与第一导电材料层所接触的面积，进而减少二者之间产生应力的情况，从而提升电池的寿命。
下面将结合附图对一些实施例做出说明。在不冲突的情况下，下述的实施例及实施例中的特征可以相互组合。
请参阅图1、图2和图3，为了更好的对电池1结构进行说明个，将结合X、Y、Z坐标轴对其进行说明，其中，X、Y、Z坐标轴两两垂直，具体的，Z轴为第一方向，X轴为第二方向，Y轴为第三方向。在图3中，与第二区部N的表面垂直的方向为第一方向Z，第二区部N的表面方向为X-Y方向，而图3中电极组件100的截面方向为Z-X方向的截面图。
本申请提供一种电池1，所述电池1包括电极组件100和壳体200，所述壳体200包覆所述电极组件100，且所述壳体200内填充有电解液，以使所述电池1能够正常使用。将所述电极组件100设于所述壳体200内，并向所述壳体200注入电解液在电池1制造领域中较为常见，在此，不再进行赘述。
所述电极组件100包括第一极片10、隔膜20和第二极片30，所述隔膜20设于所述第一极片10和所述第二极片30之间，用于将所述第一极片10和所述第二极片30间隔开，避免二者之间接触，发生所述电池1出现短路的情况。所述电极组件100可通过所述第一极片10、所述隔膜20和所述第二极片30之间层叠设置形成。也可通过所述第一极片10、所述隔膜20和所述第二极片30之间卷绕形成，该两种电极组件100的形成方式在电池1领域中也较为常见。其中，所述第一极片10为正极极片，所述第二极片30为负极极片。本实施例中，以卷绕的所述电极组件100进行说明。
进一步地，图3中以不连贯的虚线表示隔膜20。需要说明的是，在实际情况中，所述隔膜20为连贯的结构。
请参阅图3和图4，所述第一极片10包括第一导电体11和第一导电材料层12，所述第一导电材料层12设于所述第一导电体11上。所述第一导电体11包括第一面111和与所述第一面111相对的第二面112，所述第一导电材料层12设于所述第一面111。
所述第一导电体11还包括从所述第一导电材料层中显露出来的第一区域113和设有第一导电板40的第二区域114，所述第二区域114与所述第一区域113之间相分离，其中，所述第一区域113和所述第二区域114之间分离的距离可根据需要进行设置。例如，以卷绕的电极组件100进行说明，当所述第一区域113设于远离所述电极组件100中心的次外层圈时，所述第二区域114可设于靠近该次外层圈的第三圈位置处，进一步地，所述第二区域114还可设于靠近所述电极组件100中心的第四圈位置处。所述第一导电体11在所述第一面111上设有所述第一区域113和所述第二区域114。
在一实施例中，所述第一导电体11包括多个所述第一区域113，例如，在所述第一导电体11的第一端a，或者在所述第一导电体11的第二端b均设有所述第一区域113。其中，所述第一导电材料层12所对应的第一端a为卷绕的电极组件100内层位置处，所述第一导电材料层12所对应的第二端b为卷绕的电极组件100的外层位置处。
所述第一导电材料层12包括第一凹部121，进一步地，所述第一导电材料层12背离所述第一面111的表面包括第一凹部121，所述第一凹部121为所述第一导电材料层12自背离所述第一面111的表面向靠近所述第一面111的方向凹陷形成。
所述第一凹部121显露出所述第一区域113，所述第一导电材料层12显露出所述第二区域114。即位于所述第一区域113的第一导电材料层12通过所述第一凹部121显露出所述第一区域113，位于所述第二区域114的第一导电材料层12显露出所述第二区域114。可以将其理解为，沿所述第一方向Z观察，在第一区域113处能够看到所述第一导电体11，在第二区域114处也能够看到所述第一导电体11。具体的，此处“显露出”的意思仅意味着第一导电材料层12从所述第一区域113中显露出来，并非对所述电极组件100装入壳体200后，电解液与第一区域113的相接进行的否定，也未否定所述电极组件100卷绕时其他部分由可能对所述第一区域113产生的覆盖。
在一实施例中，所述第一导电材料层12包括多个所述第一凹部121，多个所述第一凹部121设于不同的位置处，其形状、大小和深度存在不相同的情况。进一步地，同一个所述第一凹部121能够显露出多个不同位置处的第一区域113，即多个所述第一凹部121中的其中一个与其他的第一凹部121所形成的面积不同，根据其面积能够显露出多个位置处的第一区域113。可以理解的是，多个所述第一凹部121中存在部分所述第一凹部121显露出所述第一区域113，也存在所述第一凹部121未显露出所述第一区域113的情况，未显露出第一区域113的第一凹部121靠近所述第一导电体11时，也可改善所述第一导电体11和所述第一导电材料层12之间的应力。
请参阅图3，在本实施例中，所述第一导电体11和所述第一导电材料层12形成一包括多个第一区部M和第二区部N的卷绕结构，所述第二区部N与所述第一区部M连接，以分界线O为划分位置，进一步地，所述电极组件100在卷绕式回折的部分中，沿第二方向X最接近所述电池1中心的回折端部上引入与该端部相垂直的垂线，与此垂线重叠的分界线O即为第一区部M和第二区部N的分界位置。而在图3中，比上述分界线O更接近所述电池1中心的部分为第二区部N，进一步地，直线部分为第二区部N，且第二区部N沿第二方向X设置。比上述分界线O更远离所述电池1中心的部分为第一区部M，第一区部M与第二区部N连接，进一步地，在卷绕型的电池结构中，第一区部M为卷绕电极组件中回折而形成的部分。
请参阅图4，在一实施例中，所述第一凹部121设于所述第一区部M位置处。
当所述第一凹部121设于所述第一区部M位置处，沿第二方向X观察设于所述第一区部M的第一凹部121，所述第一凹部121的截面呈圆形。可以理解的是，在其他实施例中，所述第一凹部121的截面还可呈弧形、矩形、三角形、星形、椭圆形或不规则形状等。通过在第二区部N处设置第一凹部121可以提高电池1拐角部分电解液的浸润，同时，第一凹部121的存在可以提高电池1拐角处电解液的保液，从而提高电池1拐角部分的动力学，改善拐角位置处出现析锂的情况。
可以理解的是，在其他实施例中，所述第一凹部121还可设于所述第二区部N位置处。
请参阅图5，其中，图3中的坐标方向为电极组件100呈卷绕形结构下的方向，为了能够与图3中的方向区分开，在图5中，将结合X 1、Y 1、Z 1坐标轴对其进行说明，其中，X 1、Y 1、Z 1坐标轴两两垂直，具体的，Z 1轴为第一方向，X 1轴为第二方向，Y 1轴为第三方向，进一步地，所述第二端b向所述第一端a延伸的方向为X 1，与X 1垂直且沿第一凹部121排列的方向为Y 1，Y 1与Y的方向相同，Z 1为与X 1、Y 1所形成的平面相垂直的方向。图示中斜线部分为设有所述第一导电材料层12的区域，所述第一导电材料层12包括多个第一凹部121，沿所述第二方向 X 1和所述第三方向Y 1，多个所述第一凹部121存在重叠的情况，以进一步减小所述第一导电体11和所述第一导电材料层12之间的接触面积，改善二者之间所存在的应力问题。并且，多个所述第一凹部121可以划分为凹部一121a、凹部二121b、凹部三121c、凹部四121d和凹部五121e。并且，所述凹部一121a、凹部二121b、凹部三121c、凹部四121d和凹部五121e的形态等可以不相同。
请参阅图6和图7，为了能够与图3中的方向区分开，在图6和图7中，将结合X 1、Y 1、Z 1坐标轴对其进行说明，其中，X 1、Y 1、Z 1坐标轴两两垂直，具体的，Z 1轴为第一方向，X 1轴为第二方向，Y 1轴为第三方向。进一步地，图6为图3中第一区部M位置处的第一极片10所展开的情况，图7为图6沿B-B方向的剖视示意图。
所述第一凹部121显露出所述第一区域113，进一步地，该第一凹部121还可显露出与靠近该所述第一区域113的另一第一区域113，即一个第一凹部121可以显露出两个或者两个以上第一区域113。沿所述第一方向Z 1，多个所述第一凹部121中至少一部分在所述第三方向Y 1上重叠，并且所述第一凹部121在所述第二方向X 1和所述第三方向Y 1上具有各自不同的长度。进一步地，所述第一凹部121包括延伸距离互不相同的第一部分1211和第二部分1212。具体的，所述第一部分1211和所述第二部分1212从所述第一导电材料层12背离所述第一面111的表面朝向所述第一面111延伸。其中，沿所述第一方向Z 1，所述第一部分1211延伸至所述第一导电材料层12的中心部位以上，所述第二部分1212延伸至所述第一导电材料层12的中心部位以下。进一步地，沿所述第一方向Z 1，所述第一凹部121延伸的距离范围为1μm至200μm。所述第一部分1211延伸的距离为H 1，所述第二部分1212延伸的距离为H 2，例如，H 2延伸的距离大于H 1延伸的距离，进一步地，H 1为60μm，H 2为130μm。
所述第一凹部121还包括第三部分1213，沿所述第一方向Z 1，所述第三部分1213从所述第一导电材料层12背离所述第一面111的表面朝向所述第一面111延伸，所述第三部分1213延伸至显露出所述第一区域113，并且，所述第三部分1213所延伸的距离与所述第一部分1211和第二部分1212所延伸的距离互不相同。所述第三部分1213所延伸的距离为H 3，例如，H 3延伸的距离大于H 1及H 2延伸的距离，进一步地，H 3为200μm。
可以理解的是，上述的第一部分1211、第二部分1212和第三部分1213所延伸的距离仅为举例说明。在其他实施例中，所述第一部分1211、所述第二部分1212和所述第三部分1213所延伸的距离不限于此。进一步地，还存在如下情况，所述第一凹部121还包括其他部分1214，该其他部分1214沿第一方向Z 1延伸的距离大于H 1和H 2，且小于H 3延伸的距离。例如，所述凹部三121c就同时包括第一部分1211、第二部分1212、第三部分1213和其他部分1214。
沿所述第三方向Y 1，所述第一部分1211的第一长度L 1与所述第二部分1212的第二长度L 2、所述第三部分1213的第三长度L 3互不相同。即沿第三方向Y 1，所述第一部分1211、所述第二部分1212和所述第三部分1213所延伸的距离不同。进一步地，沿所述第一方向Z 1观察，所述第一凹部121的长度范围为0.5mm至5mm。例如，所述第一部分1211的长度L 1为1mm，所述第二部分1212的长度L 2为1.5mm，所述第三部分1213的长度L 3为3mm。
可以理解的是，上述的第一部分1211、第二部分1212和第三部分1213的长度仅为距离说明。在其他实施例中，所述第一部分1211、所述第二部分1212和所述第三部分1213所 延伸的长度不限于此。
在一实施例中，沿所述第一方向Z 1观察，所述第一区域113被所述第一导电材料层12围绕，从而在该第一区域113处存储电解液，提升该位置处的动力学，改善该位置对应的负极导电材料层表面出现析锂的情况。即从所述第一区域113处能够观察到所述第一导电体11，进而所述第一导电材料层12与所述第一导电体11所接触的面积减小，从而减少所述第一导电材料层12所受到的应力，改善了第一导电材料层12从所述第一导电体11上剥离的情况。
在一实施例中，所述第一导电体11为集流体，且所述第一导电体11包含铜或者铝。可以理解的是，在其他实施例中，所述第一导电体11所包含的材料不限于此。
在一实施例中，所述第一导电材料层12为活性物质层，且所述第一导电材料层12包括锂。可以理解的是，在其他实施例中，所述第一导电材料层12所包含的材料不限于此。
在一实施例中，所述第一导电体11为正极导电体，所述第一导电材料层12为正极导电材料层。
请参阅图3，所述电池1还包括第一导电板40，所述第一导电板40设于所述第二区部N位置处。在所述第二区域114，所述第一导电体11和所述第一导电板40连接。将所述第一导电板40设于所述第二区域114，使得所述第一导电板40与所述第一区域113之间分离设置，即所述第一导电板40以离开所述第一凹部121的方式设置。当装有所述电池1的产品所处的环境温度有变化的情况下，由于温度的变化，所述第一导电体11和所述第一导电材料层12之间的相互位置发生了变化，所述第一凹部121显露出所述第一区域113，所述第一导电材料层12减少了与所述第一导电体11之间的接触面积，从而改善所述第一导电体11和所述第一导电材料层12之间的应力问题。
在一实施例中，所述第一导电板40为极耳，极耳可通过粘接的方式设于集流体上。
可以理解的是，在其他实施例中，所述第一导电板40还可通过其他的方式设于所述第一导电体11上，例如采用焊接的方式。或者，所述第一导电板40和所述第一导电体11可为一体成型结构。
请参阅图8，所述电池1还包括具有绝缘材料的第一层60，所述第一层60与所述第一导电材料层12连接。沿所述第一方向Z，所述第一层60的距离范围为5μm至30μm，即所述第一层60的厚度范围在5μm至30μm。例如，所述第一层60的厚度为15μm、20μm或25μm。在一实施例中部分所述第一层60与位于所述第一区域113的第一导电材料层12相接，且另一部分所述第一层60与显露出的所述第一导电体11连接。通过所述第一层60与所述第一导电材料层12相接，当所述电池1发生撞击、跌落等情况时，所述第一层60能够限制所述第一导电材料层12相对于所述第一导电体11发生移动，保持所述第一极片10和所述第二极片30沿所述第一方向Z的厚度一致，提升所述电池1的安全性能。
可以理解的是，在其他实施例中，所述第一层60还可与位于所述第二区域114的第一导电材料层12连接，以提升所述第一导电体11和所述第一导电材料层12的稳定性。
进一步地，所述第一层60为粘接层。该粘接层包括基层和设于所述基层的胶层，所述胶层具有粘性，以使得所述第一层能够粘接于所述第一极片10上。制成所述基层的材料包括聚烯烃、聚烯腈、聚醇酯、聚酰胺、聚氨酯以及含有聚烯烃、聚烯腈、聚醇酯、聚酰胺、聚氨酯中至少一者的复合物，制成所述胶层的材料包括聚烯烃、聚氨酯、聚丙烯酸酯、有机硅、 橡胶以及含有聚烯烃、聚氨酯、聚丙烯酸酯、有机硅、橡胶中至少一者的复合物。在一实施例中，所述粘接层为胶纸。可以理解的是，在其他实施例中，所述第一层60还可替换为其他具有等同功效或作用的结构。所述基层和所述胶层所包括的材料也不限于此。
请参阅图3和图4，所述第一导电体11还包括第三区域115和设有第二导电板(图未示)的第四区域116，所述第四区域116与所述第三区域115之间相分离，其中，所述第三区域115和所述第四区域116之间分离的距离可根据需要进行设置。例如，以卷绕的电极组件100进行说明，当所述第三区域115设于远离所述电极组件100中心的次外层圈时，所述第四区域116可设于靠近该次外层圈的第三圈位置处，进一步地，所述第四区域116还可设于靠近所述电极组件100中心的第四圈位置处。所述第一导电体11在所述第二面112上设有所述第三区域115和所述第四区域116。
在一实施例中，所述第一导电体11包括多个所述第三区域115，例如，在所述第一导电体11的第三端c，或者在所述第一导电体11的第四端d均设有所述第三区域115。
所述电池1还包括第二导电材料层13，所述第二导电材料层13设于所述第二面112，且所述第二导电材料层13包括第二凹部131，进一步地，所述第二导电材料层13背离所述第二面112的表面包括第二凹部131，所述第二凹部131为所述第二导电材料层13自背离所述第二面112的表面向靠近所述第二面112的方向凹陷形成。
所述第二凹部131显露出所述第三区域115，所述第二导电材料层13显露出所述第四区域116。即位于所述第三区域115的第二导电材料层13通过所述第二凹部131显露出所述第三区域115，位于所述第四区域116的第二导电材料层13显露出所述第四区域116。可以将其理解为，沿所述第一方向Z观察，在第三区域115处能够看到所述第一导电体11，在第四区域116处也能够看到所述第一导电体11。具体的，此处“显露出”的意思仅意味着第二导电材料层13从所述第三区域115中显露出来，并非对所述电极组件100装入壳体200后，电解液与第三区域115的相接进行的否定，也未否定所述电极组件100卷绕时其他部分由可能对所述第三区域115产生的覆盖。
请同时参阅图7，在一实施例中，所述第二导电材料层13包括多个所述第二凹部131，多个所述第二凹部131设于不同位置处，其形状、大小和深度存在不相同的情况。多个所述第二凹部131可以划分为凹部六131a、凹部七131b、凹部八131c、凹部九131d和凹部十131e。并且，所述凹部六131a、凹部七131b、凹部八131c、凹部九131d和凹部十131e的形态等可以不相同。
进一步地，同一个所述第二凹部131能够显露出多个不同位置处的第三区域115，即多个所述第二凹部131中的其中一个与其他的第二凹部131所形成的面积不同，根据其面积能够显露出多个位置处的第三区域115。可以理解的是，多个所述第二凹部131中存在部分未显露出所述第三区域115的情况，未显露处第三区域115的第二凹部131靠近所述第一导电体11时，也可改善所述第一导电体11和所述第二导电材料层13之间的应力。沿所述第一方向Z 1，多个所述第二凹部131中至少一部分在所述第三方向Y 1上重叠。
在本实施例中，与所述第一凹部121相同，所述第二凹部131设于该卷绕结构中的第一区部M位置处。
在另一实施例中，所述第二凹部131还可设于所述第二区部N位置处。并且，所述第二 凹部131的形状与所述第一凹部121的形状大致相同，其中，“大致相同”应理解包括相同的形状和类似的形状。
请参阅图7，沿所述第一方向Z 1，所述第二凹部131包括延伸距离互不相同的第四部分1311和第五部分1312。具体的，所述第四部分1311和所述第五部分1312从所述第二导电材料层13背离所述第二面112的表面朝向所述第二面112延伸。其中，沿所述第一方向Z 1，所述第四部分1311延伸至所述第二导电材料层13的中心部位以下，所述第五部分1312延伸至所述第二导电材料层13的中心部位以上，所述第一面111和所述第二面112为相对的两个面，则所述第一凹部121和所述第二凹部131所延伸的情况相反。进一步地，沿所述第一方向Z 1，所述第二凹部131延伸的距离范围为1μm至200μm。所述第四部分1311延伸的距离为H 4，所述第五部分1312延伸的距离为H 5，例如，H 5延伸的距离大于H 4延伸的距离，进一步地，H 4为50μm，H 5为140μm。
所述第二凹部131还包括第六部分1313，沿所述第一方向Z 1，所述第六部分1313从所述第二导电材料层13背离所述第二面112的表面朝向所述第二面112延伸，所述第六部分1313延伸至显露出所述第三区域115，并且，所述第六部分所延伸的距离与所述第四部分1311和所述第五部分1312所延伸的距离互不相同。所述第六部分1313所延伸的距离为H 6，例如，H 6延伸的距离大于H 4及H 5延伸的距离，进一步地，H 6为200μm。
可以理解的是，上述的第四部分1311、第五部分1312和第六部分1313所延伸的距离仅为举例说明。在其他实施例中，所述第四部分1311、所述第五部分1312和所述第六部分1313所延伸的距离不限于此。进一步地，还存在如下情况，所述第二凹部131还包括其他部分1314，该其他部分1314沿第一方向Z 1延伸的距离大于H 4和H 5，且小于H 6延伸的距离。例如，所述凹部八131c就同时包括第四部分1311、第五部分1312、第六部分1313和其他部分1314。
沿所述第三方向Y 1，所述第四部分1311的第四长度L 4与所述第五部分1312的第五长度L 5、所述第六部分1313的第六长度L 6互不相同。即沿所述第三方向Y 1，所述第四部分1311、所述第五部分1312和所述第六部分1313所延伸的距离不同。进一步地，沿所述第一方向Z 1观察，所述第二凹部131的长度范围为0.5mm至5mm。例如，所述第四部分1311的长度L 4为1.5mm，所述第五部分1312的长度L 5为2.5mm，所述第六部分1313的长度L 6为3.5mm。
可以理解的是，上述的第四部分1311、第五部分1312和第六部分1313的长度仅为距离说明。在其他实施例中，所述第四部分1311、所述第五部分1312和所述第六部分1313所延伸的长度不限于此。
在一实施例中，沿所述第一方向Z 1观察，所述第三区域115被所述第二导电材料层13围绕，从而在该第三区域115处存储电解液，提升该位置处的动力学，改善该位置对应的负极导电材料层表面出现析锂的情况。即从所述第三区域115处能够观察到所述第一导电体11，进而所述第二导电材料层13与所述第一导电体11所接触的面积减小，从而减少所述第二导电材料层13所受到的应力，改善了第二导电材料层13从所述第一导电体11上剥离的情况。
在一实施例中，所述第二导电材料层13为活性物质层，且所述第二导电材料层13包括锂。可以理解的是，在其他实施例中，所述第二导电材料层13所包含的材料不限于此。
请参阅图3，所述电池1还包括第二导电板，所述第二导电板设于所述第二区部N位置 处。在所述第四区域116，所述第一导电体11和所述第二导电板连接。将所述第二导电板设于所述第四区域116，使得所述第二导电板与所述第三区域115之间分离设置，即所述第二导电板以离开所述第二凹部131的方式设置。当装有所述电池1的产品所处的环境温度有变化的情况下，由于温度的变化，所述第一导电体11和所述第二导电材料层13之间的相互位置发生了变化，所述第二凹部131显露出所述第三区域115，所述第二导电材料层13减少了与所述第一导电体11之间的接触面积，从而改善所述第一导电体11和所述第二导电材料层13之间的应力问题。
在一实施例中，所述第二导电板为极耳，极耳可通过粘接的方式设于集流体上。
可以理解的是，在其他实施例中，所述第二导电板还可通过其他的方式设于所述第一导电体11上，例如采用焊接的方式。或者，所述第二导电板和所述第一导电体11可为一体成型结构。所述第一导电板40和所述第二导电板可选择其中一个与所述第一导电体11连接，从而实现极耳与集流体的连接，或者，在另一实施例中，在所述第一导电体11上同时连接所述第一导电板40和所述第二导电板。
所述电池1包括的第一层60也与所述第二导电材料层13连接，当所述第一导电体11上同时设有所述第一导电材料层12和所述第二导电材料层13时，所述第一层60同时与所述第一导电材料层12和所述第二导电材料层13连接。进一步地，部分所述第一层60与位于所述第三区域115的第二导电材料层13相接，且另一部分所述第一层60与显露出的所述第一导电体11连接。
可以理解的是，在其他实施例中，所述第一层60还可与位于所述第四区域116的第一导电材料层12连接，以提升所述第一导电体11和所述第二导电材料层13的稳定性。
请参阅图3，所述第一层60设置于所述第一导电体11上时，沿所述第三方向Y观察，设有所述第一层60的第一导电体11与所述第二极片30之间存在台阶层，具体的，所述第一导电材料层12与所述第二极片30上的导电材料层形成台阶，当所述第一层60与所述第一导电材料层12连接时，所述第一层60可填充所形成的台阶，从而在沿所述第一方向Z，设有所述第一层60的第一极片10和第二极片30的整体厚度与其他未设有所述第一层60的第一极片10和第二极片30的厚度相同，减少当所述电池1发生撞击、跌落时，可能会出现的第一极片10与第二极片30之间发生相对移动的情况。
请参阅图7，在一实施例中，所述第一凹部121和所述第二凹部131交错设置，其中，以虚线为分界位置。以确保所述第一导电体11上设有导电材料层之外，还能够改善所述第一导电体11和所述第一导电材料层12、所述第二导电材料层13之间的应力问题。进一步地，沿所述第一方向Z 1，所述第一凹部121和所述第二凹部131之间还存在重叠的地方，具体的，如图示中细点划线的部分所示。
请参阅图7，在一实施例中，所述第一凹部121和所述第二凹部131之间也存在重叠的情况。例如，以图7中所示的细点划线为分界位置，以改善所述第一凹部121和所述第二凹部131所对应的第一导电体11位置处的应力问题。
请再参阅图3，所述第二极片30的结构与所述第一极片10的结构大致相同，其中，“大致”应理解为并非完全相同，还包括第一极片10和第二极片30之间存在微小差别的情况。其中，所述第二极片30上设有第三导电板50，所述第三导电板50与所述第二极片30之间 的具体结构及连接关系可以参照所述第一极片10和所述第一导电板40的内容，在此，不再进行赘述。
请参阅图9，本申请的实施例还提供一种电子装置5，所述电子装置5包括本体300和如上述实施例中任一项所述的电池1，所述电池1收容于所述本体300内。所述电子装置5可为手机、平板、电子阅读器中的一种。所述电子装置5包括上述任一所述电池1，因而具有该电池1的一切有益效果，在此，不再进行赘述。
本申请中所述电子装置5以手机为例，所述电池1设置于手机内，以向手机提供电量供手机使用，所述本体300为手机结构。可以理解的是，在其他实施例中，所述电子装置5还可为其他结构，不限于上述的为手机、平板、电子阅读器。
综上所述，本申请实施例中提供的电池1及电子装置5，通过采用上述的电池1，所述第一导电体11包括第一区域113和第二区域114，所述第一导电材料层12设于所述第一导电体11上，且所述第一导电材料层12包括第一凹部121，所述第一凹部121显露出所述第一区域113，所述第一导电材料层12显露出所述第二区域114，所述第一导电板40设于所述第二区域114且与所述第一导电体11连接。如此设置，当所述第一导电体11被拉长的情况下，所述第一导电板40远离所述第一区域113，能够改善所述第一导电体11和所述第一导电材料层12之间的应力问题。
另外，本技术领域的普通技术人员应当认识到，以上的实施例仅是用来说明本申请，而并非用作为对本申请的限定，只要在本申请的实质精神范围之内，对以上实施例所作的适当改变和变化都落在本申请公开的范围之内。

Claims (38)

  1. 一种电池，包括第一导电体和第一导电材料层，其中，
    所述第一导电体包括第一面和第二面，所述第一面和所述第二面为所述第一导电体相对设置的两个面；
    所述第一面设有所述第一导电材料层，所述第一导电材料层包括第一凹部；
    所述第一导电体还包括第一区域和第二区域，所述第一区域和所述第二区域相分离，所述第一凹部显露出所述第一区域，所述第一导电材料层显露出所述第二区域；
    所述电池还包括第一导电板，在所述第二区域，所述第一导电体和所述第一导电板连接。
  2. 如权利要求1所述的电池，其中，所述第一导电体包括多个所述第一区域。
  3. 如权利要求1所述的电池，其中，沿与所述第一导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第一凹部包括延伸距离互不相同的第一部分和第二部分。
  4. 如权利要求3所述的电池，其中，沿所述第一方向，所述第一凹部还包括第三部分，所述第三部分与所述第一部分和所述第二部分所延伸的距离互不相同。
  5. 如权利要求4所述的电池，其中，沿与所述第一方向所垂直的方向为第三方向，沿所述第三方向，所述第一部分的第一长度与所述第二部分的第二长度互不相同。
  6. 如权利要求5所述的电池，其中，沿所述第三方向，所述第三部分的第三长度与所述第一长度和所述第二长度互不相同。
  7. 如权利要求5所述的电池，其中，所述第一导电材料层包括多个所述第一凹部，沿所述第三方向，多个所述第一凹部重叠。
  8. 如权利要求3所述的电池，其中，沿所述第一方向，所述第一凹部延伸的距离范围为1μm至200μm；沿所述第一方向观察，所述第一凹部的长度范围为0.5mm至5mm。
  9. 如权利要求1所述的电池，其中，同一所述第一凹部显露出多个不同位置的所述第一区域。
  10. 如权利要求1所述的电池，其中，所述第一导电体和所述第一导电材料层为包括多个第一区部的卷绕结构，所述第一凹部设于所述第一区部。
  11. 如权利要求1所述的电池，其中，沿与所述第一导电材料层表面所垂直的方向为第一方向，沿所述第一方向观察，所述第一区域被所述第一导电材料层围绕。
  12. 如权利要求1所述的电池，其中，所述电池还包括具有绝缘材料的第一层，所述第一层与所述第一导电材料层连接。
  13. 如权利要求12所述的电池，其中，沿与所述第一导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第一层的距离范围为5μm至30μm。
  14. 如权利要求12所述的电池，其中，所述第一层为粘接层。
  15. 如权利要求14所述的电池，其中，所述粘接层包括基层和设于所述基层的胶层；
    所述基层包括聚对苯二甲酸乙二酯；
    所述胶层包括苯乙烯-异戊二烯-苯乙烯嵌段共聚物。
  16. 如权利要求1所述的电池，其中，所述第一导电体为集流体。
  17. 如权利要求1所述的电池，其中，所述第一导电体包含铜或者铝。
  18. 如权利要求1所述电池，其中，所述第一导电材料层为活性物质层。
  19. 如权利要求1所述的电池，其中，所述第一导电材料层包括锂。
  20. 如权利要求1所述的电池，其中，所述电池还包括第二导电材料层，所述第二导电材料层设于所述第二面，所述第二导电材料层包括第二凹部；
    所述第一导电体还包括第三区域和第四区域，所述第三区域和所述第四区域相分离，所述第二凹部显露出所述第三区域，所述第二导电层材料显露出所述第四区域；
    所述电池还包括第二导电板，在所述第四区域，所述第一导电体和所述第二导电板连接。
  21. 如权利要求20所述的电池，其中，所述第一导电体包括多个所述第三区域。
  22. 如权利要求20所述的电池，其中，沿与所述第二导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第二凹部包括延伸距离互不相同的第四部分和第五部分。
  23. 如权利要求22所述的电池，其中，沿所述第一方向，所述第二凹部还包括第六部分，所述第六部分与所述第四部分和所述第五部分所延伸的距离互不相同。
  24. 如权利要求23所述的电池，其中，沿与所述第一方向所垂直的方向为第三方向，沿所述第三方向，所述第四部分的第四长度与所述第五部分的第五长度互不相同。
  25. 如权利要求24所述的电池，其中，沿所述第三方向，所述第六部分的第六长度与所述第四长度和所述第五长度互不相同。
  26. 如权利要求24所述的电池，其中，所述第二导电材料层包括多个所述第二凹部，沿所述第三方向，多个所述第二凹部重叠。
  27. 如权利要求22所述电池，其中，沿所述第一方向，所述第二凹部延伸的距离范围为1μm至200μm；沿所述第一方向观察，所述第二凹部的长度范围为0.5mm至5mm。
  28. 如权利要求20所述的电池，其中，所述第二导电材料层为包括多个第一区部的卷绕结构，所述第二凹部设于所述第一区部。
  29. 如权利要求20所述的电池，其中，沿与所述第二导电材料层表面所垂直的方向为第一方向，沿所述第一方向观察，所述第三区域被所述第一导电材料层围绕。
  30. 如权利要求20所述的电池，其中，所述电池还包括具有绝缘材料的第一层，所述第一层与所述第二导电材料层连接。
  31. 如权利要求30所述的电池，其中，沿与所述第二导电材料层表面所垂直的方向为第一方向，沿所述第一方向，所述第一层的距离范围为5μm至30μm。
  32. 如权利要求30所述的电池，其中，所述第一层为粘接层。
  33. 如权利要求32所述的电池，其中，所述粘接层包括基层和设于所述基层的胶层；
    所述基层包括聚对苯二甲酸乙二酯；
    所述胶层包括苯乙烯-异戊二烯-苯乙烯嵌段共聚物。
  34. 如权利要求20所述的电池，其中，所述第二导电材料层为活性物质层。
  35. 如权利要求20所述的电池，其中，所述第二导电材料层包括锂。
  36. 如权利要求20所述的电池，其中，所述第一凹部和所述第二凹部交错设置。
  37. 如权利要求1所述的电池，其中，所述第一导电体为正极导电体，所述第一导电材料层为正极导电材料层。
  38. 一种电子装置，其特征在于，所述电子装置包括本体和如权利要求1至37中任一项所述的电池，所述电池收容于所述本体内。
PCT/CN2021/095685 2021-05-25 2021-05-25 电池及电子装置 WO2022246629A1 (zh)

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