WO2023123410A1 - 电芯、电池和用电设备 - Google Patents

电芯、电池和用电设备 Download PDF

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Publication number
WO2023123410A1
WO2023123410A1 PCT/CN2021/143820 CN2021143820W WO2023123410A1 WO 2023123410 A1 WO2023123410 A1 WO 2023123410A1 CN 2021143820 W CN2021143820 W CN 2021143820W WO 2023123410 A1 WO2023123410 A1 WO 2023123410A1
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WO
WIPO (PCT)
Prior art keywords
adhesive layer
tab
bonded
electric core
electrode assembly
Prior art date
Application number
PCT/CN2021/143820
Other languages
English (en)
French (fr)
Inventor
伍应阳
詹东欧
金鑫
Original Assignee
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.)
Filing date
Publication date
Application filed by 东莞新能源科技有限公司 filed Critical 东莞新能源科技有限公司
Priority to CN202180032563.7A priority Critical patent/CN115668628A/zh
Priority to PCT/CN2021/143820 priority patent/WO2023123410A1/zh
Publication of WO2023123410A1 publication Critical patent/WO2023123410A1/zh

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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
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/46—Separators, membranes or diaphragms characterised by their combination with electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • 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

Definitions

  • the present application relates to the field of battery technology, in particular to a battery cell, battery and electrical equipment.
  • An embodiment of the present application provides an electric core, including an electrode assembly and a first tab.
  • the electrode assembly includes a first pole piece, a second pole piece and a separator arranged between the first pole piece and the second pole piece.
  • the outer surface of the electrode assembly includes a first side surface and a second side surface opposite to each other along a first direction, and a first end surface and a second end surface opposite to each other along a second direction.
  • One end of the first tab is electrically connected to the first pole piece, and the other end of the first tab protrudes from the first end surface.
  • the first tab includes a first surface and a second surface, the first surface faces the first side, and the second surface faces away from the first side.
  • the first end surface includes a first region located between the first surface and the first side.
  • the electric core also includes a first adhesive layer and a second adhesive layer.
  • the first adhesive layer is attached to the first area and extends from the first area to the first side, and part of the first adhesive layer is bonded to the isolation film at the first area.
  • the second adhesive layer is bonded to at least part of the second surface and extends from the second surface to the second side, and part of the second adhesive layer is bonded to the isolation film at the first end surface.
  • the isolation film at the first area is integrated with the first side through the first adhesive layer, and the part of the isolation film at the first end surface is integrated with the second side by the second adhesive layer, so as to reduce the drop of the cell During the process, the isolation film at the first end surface shrinks inwardly to cause the risk of a short circuit in the battery cell, so as to improve the safety of the battery cell.
  • the third direction is perpendicular to the first direction and the second direction, and along the third direction, the ratio of the width of the first adhesive layer to the width of the electrode assembly ranges from 3/4 to 6/5; and/ Or, the ratio of the width of the second adhesive layer to the width of the electrode assembly ranges from 3/4 to 6/5.
  • the ratio of the width of the first adhesive layer to the width of the electrode assembly is 3/4 to 1, the width of the first adhesive layer is within the width of the electrode assembly, so as to save the usage of the first adhesive layer.
  • the part of the first adhesive layer that exceeds the electrode assembly can be connected to both sides of the electrode assembly along the third direction to improve The bonding area of the first adhesive layer improves the bonding stability of the first adhesive layer.
  • the first adhesive layer includes a first part and a second part connected to the first part, the first part is bonded to the first side and the first area respectively, and along the first direction, part of the second part is bonded attached to the first surface.
  • the first part is used for bonding with the isolation film at the first area, and makes the isolation film at the first area integral with the first side.
  • Part of the second part is bonded to the first surface, further making the first tab, the isolation film at the first area, and the first side form a whole, thereby reducing the isolation at the first end surface of the cell during the drop process
  • the film shrinks inward and causes the risk of short circuit of the battery cell, which improves the safety of the battery cell.
  • the electrode assembly further includes a third side and a fourth side oppositely arranged along the third direction, and in the third direction, the two ends corresponding to the first adhesive layer extend to the third side and the fourth side respectively
  • the four sides are flush, so that the first side can evenly share the tension when receiving the tension of the first adhesive layer, and reduce the risk of tearing caused by uneven force on the first side.
  • the first adhesive layer further includes a third part and a fourth part, the third part is bonded to the third side, and the fourth part is bonded to the fourth side, so that the first side, the The isolation film at one area, the third side and the fourth side form an integral body, which further reduces the risk of a short circuit of the battery cell caused by a part of the isolation film at the first end surface shrinking inward during the fall of the cell.
  • the part of the first tab protruding from the first end surface is bent from the second side to the first side, so as to reduce the packaging space occupied by the first tab in the second direction and improve the battery energy. density.
  • the electric core further includes a packaging bag for accommodating the electrode assembly and a first tab lead, one end of the first tab lead is arranged on the first surface or the second surface, and the other end of the first tab lead is Extending to the outside of the packaging bag; part of the second part is bonded to the surface of the first tab lead, or the second adhesive layer is partially bonded to the surface of the first tab lead to reduce the contact between the first tab lead and the electrode assembly risk of short circuit.
  • the battery cell further includes a second tab.
  • One end of the second tab is electrically connected to the electrode assembly, and the other end of the second tab protrudes from the first end face.
  • the second tab includes a third surface and a fourth surface, the third surface faces the first side, and the fourth surface faces away from the first side.
  • the first end surface includes a second region located between the third surface and the first side.
  • the first adhesive layer also extends from the first area to the second area, and part of the first adhesive layer is bonded to the isolation film at the second area, and the second adhesive layer is also bonded to at least part of the fourth surface.
  • the first adhesive layer makes the isolation film in the first area, the isolation film in the second area, and the first side form a whole
  • the second adhesive layer makes the first tab, the second tab, and the first end face Part of the isolation film and the second side form an integral body, thereby reducing the risk of a short circuit caused by the inward shrinkage of the isolation film at the first end surface of the cell during the drop process, thereby improving the safety of the cell.
  • the electric core further includes a second tab lead, one end of the second tab lead is arranged on the third surface or the fourth surface, and the first adhesive layer is partially bonded to the surface of the second tab lead , or the second adhesive layer is partially bonded to the surface of the second tab lead, so as to reduce the risk of short circuit caused by the contact between the second tab lead and the electrode assembly.
  • the electric core further includes a third adhesive layer bonded to the first surface, which is used to protect the first tab or the first tab lead bonded by the third adhesive layer, and reduce the The risk of short circuit caused by the contact between the first tab part or the first tab lead part bonded by the third adhesive layer and the electrode assembly.
  • the electric core further includes a fourth adhesive layer partially bonded to the surface of the first tab lead, and a part of the fourth adhesive layer is provided between the first surface and the third adhesive layer, and the fourth adhesive layer At least part of the layer is also connected to the third adhesive layer, and the fourth adhesive layer is used to encapsulate at least part of the first tab lead.
  • the electric core further includes a fifth adhesive layer partially bonded to the second surface, and a part of the fifth adhesive layer is disposed between the second surface and the second adhesive layer, and the fifth adhesive layer At least partially bonded to the second adhesive layer, the fifth adhesive layer is used to encapsulate at least part of the first tab lead.
  • the electric core further includes a sixth adhesive layer
  • the sixth adhesive layer is bonded to the second end face and extends from the second end face to the first side and the second side respectively, and the third direction is perpendicular to the first direction and the second direction, along the third direction, the width of the sixth adhesive layer is 3/4 to 6/5 of the width of the electrode assembly.
  • the sixth adhesive layer makes the isolation film at the second end face, the first side, and the second side form a whole, reducing the possibility of the short circuit of the battery caused by the inward shrinkage of the isolation film at the first area during the fall of the battery cell. risk.
  • the electrode assembly is wound or stacked by the first pole piece, the separator and the second pole piece
  • the first tab includes a plurality of first tab units, and each first tab unit One end of the first tab unit is connected to each layer of the first pole piece of the electrode assembly, and the other ends of the plurality of first tab units are welded together.
  • Embodiments of the present application further provide a battery, including a casing, and the battery further includes the battery cell in any one of the above embodiments, and the battery cell is arranged in the casing.
  • Embodiments of the present application further provide an electric device, where the electric device includes the battery in any one of the foregoing embodiments.
  • the separator located at the first area is integrated with the first side through the first adhesive layer, and the second adhesive layer makes the separator located at the first Part of the isolation film at the end face is integrated with the second side to reduce the risk of short circuit caused by the inward shrinkage of the isolation film at the first end face of the cell during the fall process, so as to improve the safety of the cell. Improve the safety of batteries and electrical equipment.
  • FIG. 1 is a schematic structural view of an electrode assembly in a battery cell according to an embodiment of the present application.
  • FIG. 2 is a schematic structural view of the first adhesive layer in the battery cell according to an embodiment of the present application.
  • Fig. 3 is a schematic structural view of the second adhesive layer in the battery cell according to an embodiment of the present application.
  • Fig. 4 is a schematic structural diagram of a third part of the battery cell according to an embodiment of the present application.
  • Fig. 5 is a schematic structural diagram of a packaging bag in an electric core according to an embodiment of the present application.
  • Fig. 6 is a schematic diagram of a disassembled structure of a packaging bag in an electric core according to an embodiment of the present application.
  • Fig. 7 is a schematic structural diagram of a fourth part of the battery cell according to an embodiment of the present application.
  • Fig. 8 is a schematic view of the structure of the third glue layer in the battery cell according to an embodiment of the present application at a first viewing angle.
  • FIG. 9 is a schematic structural diagram of a second viewing angle of a third adhesive layer in an electric core according to an embodiment of the present application.
  • Fig. 10 is a schematic view of the structure of the sixth adhesive layer in the battery cell according to an embodiment of the present application at a first viewing angle.
  • FIG. 11 is a schematic structural diagram of a second viewing angle of the sixth adhesive layer in the battery cell according to an embodiment of the present application.
  • Fig. 12 is a schematic structural diagram of the fifth part of the battery cell according to an embodiment of the present application.
  • Fig. 13 is a schematic structural diagram of the sixth part of the battery cell according to an embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of a ninth adhesive layer in a battery cell according to an embodiment of the present application.
  • Fig. 15 is a cross-sectional view along line A-A in Fig. 2 .
  • Fig. 16 is a sectional view along the section line B-B in Fig. 2 .
  • Fig. 17 is a schematic structural diagram of an electrical device in an embodiment of the present application.
  • the first adhesive layer 30 is the first adhesive layer 30
  • the fourth adhesive layer 72 is the fourth adhesive layer 72
  • the seventh adhesive layer 75 is the seventh adhesive layer 75.
  • An embodiment of the present application provides an electric core, including an electrode assembly and a first tab.
  • the electrode assembly includes a first pole piece, a second pole piece and a separator arranged between the first pole piece and the second pole piece.
  • the outer surface of the electrode assembly includes a first side surface and a second side surface opposite to each other along a first direction, and a first end surface and a second end surface opposite to each other along a second direction.
  • One end of the first tab is electrically connected to the first pole piece, and the other end of the first tab protrudes from the first end surface.
  • the first tab includes a first surface and a second surface, the first surface faces the first side, and the second surface faces away from the first side.
  • the first end surface includes a first region located between the first surface and the first side.
  • the electric core also includes a first adhesive layer and a second adhesive layer.
  • the first adhesive layer is attached to the first area and extends from the first area to the first side, and part of the first adhesive layer is bonded to the isolation film at the first area.
  • the second adhesive layer is bonded to at least part of the second surface and extends from the second surface to the second side, and part of the second adhesive layer is bonded to the isolation film at the first end surface.
  • the isolation film at the first area is integrated with the first side through the first adhesive layer, and the part of the isolation film at the first end surface is integrated with the second side by the second adhesive layer, so as to reduce the drop of the cell During the process, the isolation film at the first end surface shrinks inward, which causes the risk of short circuit of the battery cell, and improves the safety of the battery cell.
  • an embodiment of the present application provides a battery cell 100 , and the battery cell 100 includes an electrode assembly 10 and a first tab 20 .
  • the electrode assembly 10 includes a first pole piece 11 , a second pole piece 12 and a separator 13 arranged between the first pole piece 11 and the second pole piece 12 (see FIGS. 15 and 16 ).
  • the outer surface of the electrode assembly 10 includes a first side surface 10a and a second side surface 10b oppositely arranged along the first direction X, and a first end surface 10c and a second end surface 10d oppositely arranged along the second direction Z.
  • first tab 20 is electrically connected to the electrode assembly 10, and the other end of the first tab 20 protrudes from the first end surface 10c.
  • the part of the first tab 20 protruding from the first end surface 10c is bent from the second side 10b toward the first side 10a, so as to reduce the packaging space occupied by the first tab 20 in the second direction Z. , improve battery energy density.
  • the first tab 20 includes a first surface 21 and a second surface 22, the first surface 21 faces the first side 10a, and the second surface 22 faces away from the first side 10a.
  • the first end face 10c includes a first region 10e located between the first surface 21 and the first side 10a.
  • the battery cell 100 further includes a first adhesive layer 30 and a second adhesive layer 40 .
  • the first adhesive layer 30 is attached to the first area 10e and extends from the first area 10e to the first side 10a, and the part of the first adhesive layer 30 is bonded to the part of the isolation film 13 located at the first area 10e, so that The isolation film 13 located at the first region 10e is integrally formed with the first side 10a, so that when the isolation film 13 is impacted, since the isolation film 13 is bonded to the first adhesive layer 30, the isolation film 13 can be prevented from shrinking, and then It can reduce the risk that the isolation film 13 at the first region 10e shrinks inwardly to cause a short circuit of the battery cell 100 when the battery cell 100 is dropped.
  • the height of the first adhesive layer 30 on the first side 10 a ranges from 3 mm to 15 mm.
  • the height of the first adhesive layer 30 on the first side 10a is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm and the like.
  • the second adhesive layer 40 is bonded to at least part of the second surface 22 and extends from the second surface 22 to the second side 10b, and part of the second adhesive layer 40 is bonded to part of the isolation film 13 located at the first end surface 10c,
  • the part of the isolation film 13 located at the first end surface 10c is integrated with the second side surface 10b, so as to reduce the inward contraction of the part of the isolation film 13 at the first end surface 10c of the battery cell 100 during the drop process and cause a short circuit of the battery cell 100 risks of.
  • the second surface 22 is separated from the second side 10b in the second direction Z, and on the first end surface 10c, the isolation film 13 in the area between the second surface 22 and the second side 10b is separated from the second side 10b.
  • Two adhesive layers 40 are bonded. It can be understood that, in some other embodiments, the second surface 22 is flush with the second side 10b in the second direction Z, and the second adhesive layer 40 directly extends from the second surface 22 to the second side 10b.
  • the height of the second adhesive layer 40 on the second side 10 b ranges from 3 mm to 15 mm.
  • the height of the second adhesive layer 40 on the second side 10b is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm and the like.
  • the first adhesive layer 30 integrates the isolation film 13 located at the first region 10e with the first side 10a, and the second adhesive layer 40 forms a part of the isolation film 13 located at the first end surface 10c with the first side surface 10a.
  • the two side surfaces 10b are integrated to reduce the risk of a short circuit of the battery cell 100 caused by the inward shrinkage of the isolation film 13 at the first end surface 10c of the battery cell 100 during the drop process, so as to improve the safety of the battery cell 100 .
  • the third direction Y is perpendicular to the first direction X and the second direction Z.
  • the third direction Y is the width direction of the first adhesive layer 30 and the electrode assembly 10.
  • the ratio of the width of the first adhesive layer 30 to the width of the electrode assembly 10 ranges from 3/4 to 6/5, that is, the first
  • the ratio range is less than 3/4, the bonding area between the first adhesive layer 30 or the second adhesive layer 40 and the separator 13 is small, and the bonding stability between the two is weak.
  • the battery cell 100 When falling, it is more difficult to weaken the impact force of the electrolyte on the isolation film 13 at the first end surface 10c, and then it is more difficult to prevent the isolation film 13 at the first end surface 10c from shrinking inwardly to cause the risk of a short circuit in the battery cell 100; and when When the ratio range is greater than 6/5, the distance between the electrode assembly 10 and the inner surface of the packaging bag 80 in the width direction will be too large, which will affect the energy density of the battery cell 100 .
  • the ratio of the width of the first adhesive layer 30 to the width of the electrode assembly 10 is 3/4, 4/5, 17/20, 9/10, 19/20, 1, 21/20, 11/10, 23 One of /20, 6/5, etc.; the ratio of the width of the second adhesive layer 40 to the width of the electrode assembly 10 is 3/4, 4/5, 17/20, 9/10, 19/20, 1, 21 One of /20, 11/10, 23/20, 6/5, etc.
  • the first adhesive Layer 30 produces the same effect, which will not be repeated here.
  • the first adhesive layer 30 includes a first portion 31 and a second portion 32 connected to the first portion 31 .
  • the first part 31 is respectively bonded to the first side 10a and the first region 10e, and the first part 31 is used for bonding with the isolation film 13 at the first region 10e, and makes the isolation film 13 at the first region 10e and the first One side 10a is integrally formed.
  • the second part 32 is partially bonded to the first surface 21, further making the first tab 20, the isolation film 13 at the first region 10e, and the first side 10a form a whole, thereby reducing the electric current.
  • the isolation film 13 at the first end surface 10c shrinks inwardly, causing the risk of a short circuit in the battery cell 100 , so as to improve the safety of the battery cell 100 .
  • the electrode assembly 10 further includes a third side 10f and a fourth side 10g oppositely disposed along the third direction Y.
  • corresponding two ends of the first adhesive layer 30 respectively extend to be flush with the third side 10f and the fourth side 10g. That is, the ratio of the width of the first adhesive layer 30 to the width of the first side 10a is 1, so that the first side 10a can share the tensile force evenly when receiving the pulling force of the first adhesive layer 30, and reduce the uneven force on the first side 10a. risk of tearing.
  • the first adhesive layer 30 further includes a third portion 33 and a fourth portion 34 .
  • the third part 33 is bonded to the third side 10f
  • the fourth part 34 is bonded to the fourth side 10g, so that the first side 10a, the separator 13 located at the first region 10e, the third side 10f and the fourth side 10g forms a whole, which further reduces the risk of a short circuit in the battery cell 100 caused by the inward contraction of part of the isolation film 13 at the first end surface 10c of the battery cell 100 during the drop process.
  • the third portion 33 is connected to one end of the first portion 31 in the third direction Y, and the third portion 33 is bent toward the third side 10f and bonded to the third side 10f.
  • the fourth part 34 is connected to the other end of the first part 31 in the third direction Y, and the fourth part 34 is bent toward the fourth side 10g and bonded to the fourth side 10g.
  • the battery cell 100 further includes a packaging bag 80 for accommodating the electrode assembly 10 .
  • the packaging bag 80 includes a first concave portion 81 and a second concave portion 82 .
  • the first concave portion 81 and the second concave portion 82 are opposite to each other and jointly define a receiving space for receiving the electrode assembly 10 .
  • the first recess 81 is deeper than the second recess 82
  • the first side 10 a is opposite to the bottom of the first recess 81
  • the second side 10 b is opposite to the bottom of the second recess 82 .
  • the battery cell 100 further includes a first tab lead 51 .
  • One end of the first tab lead 51 is disposed on the first surface 21 or the second surface 22 , and the other end of the first tab lead 51 extends out of the packaging bag 80 .
  • the second portion 32 is partially bonded to the surface of the first tab lead 51, and at least part of the first tab lead 51 is positioned on the surface of the first tab lead 51. between the first surface 21 and the second part 32 to reduce the risk of short circuit caused by the contact of the first tab lead 51 with the electrode assembly 10 .
  • the second adhesive layer 40 is partially bonded to the surface of the first tab lead 51, and at least part of the first tab lead 51 is positioned on the second surface. Between the surface 22 and the second glue layer 40 , so as to reduce the risk of a short circuit caused by the contact between the first tab lead 51 and the electrode assembly 10 .
  • the battery cell 100 further includes a second tab 60, one end of the second tab 60 is electrically connected to the electrode assembly 10, and the other end of the second tab 60 extends from the first end surface 10c. out.
  • the part of the second tab 60 protruding from the first end surface 10c is bent from the second side 10b toward the first side 10a, so as to reduce the packaging space occupied by the first tab 20 in the second direction Z. , improve battery energy density.
  • the second tab 60 includes a third surface 61 and a fourth surface 62, the third surface 61 faces the first side 10a, and the fourth surface 62 faces away from the first side 10a.
  • the first end surface 10c includes a second region 10h located between the third surface 61 and the first side surface 10a.
  • the first adhesive layer 30 also extends from the first area 10e to the second area 10h, and part of the first adhesive layer 30 is bonded to the isolation film 13 located in the second area 10h, so that The isolation film 13 at the first area 10e and the second area 10h is integrated with the first side 10a, so as to reduce the inward contraction of the isolation film 13 at the first area 10e of the battery cell 100 during the drop process and cause a short circuit of the battery cell 100 risks of.
  • the first part 31 is respectively bonded to the first side 10a, the first region 10e, and the second region 10h, and the first part 31 is used for bonding with the isolation film 13 at the first region 10e and the second region at the second region.
  • the isolation film 13 at 10h is bonded, and the isolation film 13 at the first region 10e, the isolation film 13 at the second region 10h, and the first side 10a are formed into a whole.
  • the second part 32 extends from the first surface 21 to the third surface 61, further making the first tab 20, the second tab 60, the isolation film 13 located at the first region 10e, and the isolation film 13 located at the second
  • the isolation film 13 at the region 10h and the first side 10a form an integral body, thereby reducing the risk that the isolation film 13 at the first end surface 10c of the battery cell 100 shrinks inwardly during the drop process, resulting in a short circuit of the battery cell 100, so as to improve The safety of the battery cell 100 .
  • the second adhesive layer 40 is also bonded to at least part of the fourth surface 62, so that the first tab 20, the second tab 60, a part of the isolation film 13 located at the first end surface 10c, and The second side 10b forms a whole, thereby reducing the risk of a short circuit of the battery cell 100 caused by the inward shrinkage of the isolation film 13 at the first end surface 10c of the battery cell 100 during the drop process, and improving the safety of the battery cell 100 .
  • the battery cell 100 further includes a second tab lead 52 .
  • One end of the second tab lead 52 is disposed on the third surface 61 or the fourth surface 62 , and the other end of the first tab lead 51 extends out of the packaging bag.
  • the first adhesive layer 30 is partially bonded to the surface of the second tab lead 52 , and makes at least part of the second tab lead 52 It is located between the third surface 61 and the first adhesive layer 30 to reduce the risk of short circuit caused by the contact of the second tab lead 52 with the electrode assembly 10 .
  • the second portion 32 of the first adhesive layer 30 is partially bonded to the surface of the first tab lead 51 .
  • the second adhesive layer 40 is partially bonded to the surface of the second tab lead 52, and at least part of the second tab lead 52 is positioned on the fourth surface 62. Between the surface 62 and the second adhesive layer 40 , so as to reduce the risk of a short circuit caused by the contact of the second tab lead 52 with the electrode assembly 10 .
  • the battery cell 100 further includes a third adhesive layer 71 bonded to the first surface 21, which is used to bond the first electrode bonded by the third adhesive layer 71.
  • the ear 20 or the first tab lead 51 is protected to reduce the risk of a short circuit caused by contact between the first tab 20 or the first tab lead 51 bonded by the third adhesive layer 71 and the electrode assembly 10 .
  • the thickness of the third adhesive layer 71 is 30 ⁇ m.
  • the third adhesive layer 71 extends from the first surface 21 to the third surface 61, and is used for fixing the second tab 60 or the second pole bonded by the third adhesive layer 71.
  • the lug lead 52 is used to protect the second tab 60 or the second tab lead 52 bonded by the third adhesive layer 71 and the electrode assembly 10 to cause short circuit risk.
  • the third adhesive layer 71 bonded to the first surface 21 and the third adhesive layer 71 bonded to the third surface 61 are provided integrally. It can be understood that, in other embodiments, the third glue layer 71 bonded to the first surface 21 and the third glue layer 71 bonded to the third surface 61 are provided separately.
  • the battery cell 100 further includes a fourth adhesive layer 72 partially bonded to the surface of the first tab lead 51 , and a part of the fourth adhesive layer 72 is provided on the first surface Between 21 and the third adhesive layer 71 , at least part of the fourth adhesive layer 72 is also connected to the third adhesive layer 71 , and the fourth adhesive layer 72 is used to encapsulate at least part of the first tab lead 51 .
  • the electric core 100 further includes a fifth adhesive layer 73 partially bonded to the second surface 22, and a part of the fifth adhesive layer 73 is disposed between the second surface 22 and the second adhesive layer 40, and the fifth adhesive layer 73 is partially disposed between the second surface 22 and the second adhesive layer 40, and At least part of the fifth adhesive layer 73 is bonded to the second adhesive layer 40 , and the fifth adhesive layer 73 is used to encapsulate at least part of the second surface 22 .
  • the battery cell 100 further includes a seventh adhesive layer 75 partially bonded to the surface of the second tab lead 52 , and a part of the seventh adhesive layer 75 is disposed between the third surface 61 and the third adhesive layer 71 , at least part of the seventh adhesive layer 75 is also connected to the third adhesive layer 71 , and the seventh adhesive layer 75 is used to encapsulate at least part of the third surface 61 .
  • the battery cell 100 further includes an eighth adhesive layer 76 partially bonded to the fourth surface 62, and a part of the eighth adhesive layer 76 is disposed between the fourth surface 62 and the second adhesive layer 40, and the eighth adhesive layer 76 is partially disposed between the fourth surface 62 and the second adhesive layer 40, and the At least part of the eighth adhesive layer 76 is adhered to the second adhesive layer 40 , and the eighth adhesive layer 76 is used to encapsulate at least part of the fourth surface 62 .
  • the fourth adhesive layer 72, the fifth adhesive layer 73, the seventh adhesive layer 75, and the eighth adhesive layer 76 can be made of tab glue for fusion bonding with the packaging bag during the packaging bag packaging process, Improve the sealing performance of the battery cell 100 .
  • the battery cell 100 further includes a sixth adhesive layer 74, the sixth adhesive layer 74 is bonded to the second end surface 10d and extends from the second end surface 10d to the first The side surface 10a and the second side surface 10b, so that the isolation film 13, the first side surface 10a, and the second side surface 10b at the second end surface 10d are integrated to reduce the isolation of the battery core 100 at the first region 10e during the drop process.
  • the film 13 shrinks inwardly, causing the risk of a short circuit in the battery cell 100 .
  • the width of the sixth adhesive layer 74 is 3/4 to 6/5 of the width of the electrode assembly 10 .
  • the ratio range is less than 3/4, the bonding area between the sixth adhesive layer 74 and the separator 13 at the second end surface 10d is small, and the bonding stability between the two is weak.
  • the ratio of the width of the sixth adhesive layer 74 to the width of the electrode assembly 10 is 3/4, 4/5, 17/20, 9/10, 19/20, 1, 21/20, 11/10, 23 One of /20, 6/5, etc.
  • corresponding two ends of the sixth adhesive layer 74 respectively extend to be flush with the third side 10f and the fourth side 10g. That is, the ratio of the width of the sixth adhesive layer 74 to the width of the electrode assembly 10 is 1, so that the first side 10a and the second side 10b can share the tensile force evenly when receiving the tension of the sixth adhesive layer 74, reducing the first side 10a and the second side 10b.
  • the uneven force on the second side 10b causes the risk of tearing.
  • the sixth adhesive layer 74 further includes a fifth portion 741 and a sixth portion 742 .
  • the fifth part 741 is bonded to the third side 10f
  • the sixth part 742 is bonded to the fourth side 10g, so that the first side 10a, the second side 10b, the separator 13 located at the second end face 10d, the third side 10f and the fourth side 10g form an integral body, which further reduces the risk of a short circuit of the battery cell 100 caused by the inward contraction of the isolation film 13 at the second end surface 10d of the battery cell 100 during the drop process.
  • the height of the sixth adhesive layer 74 on the first side 10 a ranges from 3 mm to 15 mm.
  • the height of the sixth adhesive layer 74 on the first side 10a is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm and the like.
  • the height of the sixth adhesive layer 74 on the second side surface 10 b ranges from 3 mm to 15 mm.
  • the height of the sixth adhesive layer 74 on the second side 10b is one of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm and the like.
  • one end of the second tab 60 is electrically connected to the electrode assembly 10, and the other end of the second tab 60 protrudes from the second end surface 10d.
  • the adhesive layer 30 and the second adhesive layer 40 have a similar adhesive layer structure, so that the isolation film 13, the first side 10a, and the second side 10b at the second end surface 10d form an integral body, which reduces the battery cell 100 during the drop process.
  • the isolation film 13 at the first region 10e shrinks inwardly, causing the risk of a short circuit in the battery cell 100 .
  • the battery cell 100 further includes a ninth adhesive layer 77, the ninth adhesive layer 77 is bonded to the first side 10a, and is used for bonding to the inner wall of the packaging bag during the packaging bag packaging process, Reduce the displacement of the electrode assembly 10 in the packaging bag during the drop process, and reduce the impact on the battery core.
  • the height of the ninth adhesive layer 77 ranges from 10 mm to 70 mm; along the third direction Y, the width of the ninth adhesive layer 77 ranges from 10 mm to 70 mm.
  • the height of the ninth adhesive layer 77 is one of 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, etc.; the width of the ninth adhesive layer 77 is 10mm, 20mm, 30mm, 40mm, 50mm , 60mm, 70mm, etc. in one.
  • the electrode assembly 10 is wound or stacked by the first pole piece 11 , the separator 13 and the second pole piece 12 .
  • the first pole piece 11 has a positive polarity
  • the second pole piece 12 has a negative polarity
  • the first pole piece 11 has a negative polarity
  • the second pole piece 12 has a positive polarity.
  • the first tab 20 includes a plurality of first tab units 23, one end of each first tab unit 23 is connected to the first pole piece 11 of each layer of the electrode assembly 10, and the plurality of first poles The other ends of the ear unit 23 are welded together.
  • the first tab lead 51 is connected to the welding place of the plurality of first tab units 23 .
  • the second tab 60 includes a plurality of second tab units (not shown), one end of each second tab unit is connected to each layer of the second pole piece 12 of the electrode assembly 10, and the plurality of tab units The other end of the second lug unit is welded together.
  • the second tab lead 52 is connected to the welding places of the plurality of second tab units. It can be seen from FIG. 15 that the first adhesive layer 30 and/or the second adhesive layer 40 can be pasted on the outermost first tab unit 23, or pasted on the isolation film 13 beyond the first tab unit 23 in the Y direction. part, so as to enhance the adhesion between the first adhesive layer 30 and/or the second adhesive layer 40 and the isolation film 13 at the first region 10e.
  • the second part 32 and the second adhesive layer 40 are connected to each other and bent toward the first side 10a. And part of the first adhesive layer 30 and/or the second adhesive layer 40 is bonded to the isolation film 13 in the non-tab area of the first region 10e to improve the connection between the first adhesive layer 30 and/or the second adhesive layer 40 and the position.
  • the bonding area of the isolation film 13 further improves the safety of the battery cell 100 .
  • the first adhesive layer 30 is made of high-viscosity acrylic system green adhesive or polystyrene isoprene copolymer system golden adhesive paper, and the thickness of the first adhesive layer 30 ranges from 10 ⁇ m to 30 ⁇ m.
  • the thickness of the first adhesive layer 30 is 10 ⁇ m, 11 ⁇ m, 12 ⁇ m, 13 ⁇ m, 14 ⁇ m, 15 ⁇ m, 16 ⁇ m, 17 ⁇ m, 19 ⁇ m, 19 ⁇ m, 20 ⁇ m, 21 ⁇ m, 22 ⁇ m, 23 ⁇ m, 24 ⁇ m, 25 ⁇ m, 26 ⁇ m, 27 ⁇ m, One of 29 ⁇ m, 29 ⁇ m, 30 ⁇ m, etc.
  • the second adhesive layer 40 is made of high-viscosity acrylic system green adhesive or polystyrene isoprene copolymer system adhesive paper, and the thickness of the second adhesive layer 40 ranges from 10 ⁇ m to 30 ⁇ m.
  • the thickness of the second adhesive layer 40 is 10 ⁇ m, 11 ⁇ m, 12 ⁇ m, 13 ⁇ m, 14 ⁇ m, 15 ⁇ m, 16 ⁇ m, 17 ⁇ m, 19 ⁇ m, 19 ⁇ m, 20 ⁇ m, 21 ⁇ m, 22 ⁇ m, 23 ⁇ m, 24 ⁇ m, 25 ⁇ m, 26 ⁇ m, 27 ⁇ m, One of 29 ⁇ m, 29 ⁇ m, 30 ⁇ m, etc.
  • the ninth adhesive layer 77 is made of styrene-isoprene-styrene hot-melt double-sided adhesive.
  • the present application also provides a battery 200, including a casing (not shown), the battery 200 also includes any battery cell 100 in any of the above-mentioned embodiments, and the battery cell 100 is arranged in the casing, which can improve Battery 200 safety.
  • the battery 200 also includes a protection board (not shown in the figure), the battery cell 100 and the protection board are both arranged in the casing, the battery cell 100 is connected to the protection board, and the protection board is used to monitor and manage the battery 200 100 batteries.
  • the present application also provides an electric device 300 , which includes the battery 200 in any one of the above embodiments, which can improve the safety of the electric device 300 .
  • the electric device 300 may be an electronic device such as a mobile phone or a tablet computer, or a mobile device such as an electric vehicle.
  • the first adhesive layer 30 makes the separator 13 located at the first area 10e and the first side 10a form an integral body
  • the second adhesive layer 30 makes the part of the isolation film 13 at the first end surface 10c and the second side 10b form an integral body, so as to reduce the inward shrinkage of the isolation film 13 at the first end surface 10c of the battery cell 100 during the drop process and cause the battery cell 100 to break down.
  • the risk of short circuit is improved, and the safety of the battery cell 100 is improved.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Secondary Cells (AREA)

Abstract

一种电芯，包括电极组件和第一极耳。电极组件包括隔离膜。电极组件的外表面包括沿第一方向相对设置的第一侧面和第二侧面、以及沿第二方向相对设置的第一端面和第二端面。第一极耳的一端电连接于第一极片，另一端从第一端面伸出。第一极耳包括第一表面和第二表面，第一表面朝向第一侧面，第二表面背离第一侧面。第一端面包括第一区域，第一区域位于第一表面和第一侧面之间。电芯还包括第一胶层和第二胶层。第一胶层粘贴于第一区域并从第一区域延伸至第一侧面且与对应的隔离膜粘接。第二胶层粘接于第二表面的至少部分并从第二表面延伸至第二侧面且与对应的隔离膜粘接。本申请还提供设有上述电芯的电池和用电设备，能提高其安全性。

Description

电芯、电池和用电设备 技术领域
本申请涉及电池技术领域，特别涉及一种电芯、电池和用电设备。
背景技术
在实际使用中，当电池因跌落而受到撞击时，电池中的电芯的隔离膜容易受到电解液的冲击而向内收缩，从而造成电芯短路、发热等情况发生，降低了电芯安全性。
发明内容
鉴于上述状况，有必要提供一种电芯，以提高电芯的安全性。
本申请的实施例提供一种电芯，包括电极组件和第一极耳。电极组件包括第一极片、第二极片和设置在第一极片与第二极片之间的隔离膜。电极组件的外表面包括沿第一方向相对设置的第一侧面和第二侧面、以及沿第二方向相对设置的第一端面和第二端面。第一极耳的一端电连接于第一极片，第一极耳的另一端从第一端面伸出。第一极耳包括第一表面和第二表面，第一表面朝向第一侧面，第二表面背离第一侧面。第一端面包括第一区域，第一区域位于第一表面和第一侧面之间。电芯还包括第一胶层和第二胶层。第一胶层粘贴于第一区域并从第一区域延伸至第一侧面，且部分第一胶层与位于第一区域处的隔离膜粘接。第二胶层粘接于第二表面的至少部分并从第二表面延伸至第二侧面，且部分第二胶层与位于第一端面处的隔离膜粘接。
通过第一胶层使位于第一区域处的隔离膜与第一侧面形成一个整体，第二胶层使位于第一端面处的部分隔离膜与第二侧面形成一个整体，以降低电芯在跌落过程中第一端面处的隔离膜向内收缩而造成电芯发生短路的风险，以提高电芯的安全性。
本申请的一些实施例中，第三方向垂直于第一方向和第二方向，沿第三方向， 第一胶层的宽度与电极组件宽度的比值范围为3/4至6/5；和/或，第二胶层的宽度与电极组件宽度的比值范围为3/4至6/5。当第一胶层的宽度与电极组件宽度的比值为3/4至1时，第一胶层的宽度在电极组件宽度范围内，以便于节省第一胶层的使用量。当第一胶层的宽度与电极组件宽度的比值为1至6/5时，沿第三方向，第一胶层超出电极组件的部分可与电极组件沿第三方向的两侧连接，以提高第一胶层粘接面积，进而提高第一胶层粘接的稳定性。
本申请的一些实施例中，第一胶层包括第一部分和与第一部分连接的第二部分，第一部分分别粘接在第一侧面和第一区域，沿第一方向，第二部分的部分粘接在第一表面。第一部分用于与位于第一区域处的隔离膜粘接，并使位于第一区域处的隔离膜与第一侧面形成一个整体。第二部分的部分粘接在第一表面，进一步使第一极耳、位于第一区域处的隔离膜、以及第一侧面形成一个整体，进而降低电芯在跌落过程中第一端面处的隔离膜向内收缩而造成电芯发生短路的风险，提高电芯的安全性。
本申请的一些实施例中，电极组件还包括沿第三方向相对设置的第三侧面和第四侧面，在第三方向，第一胶层相对应的两端分别延伸至与第三侧面和第四侧面齐平，以使第一侧面在受到第一胶层的拉力时可均匀分摊拉力，降低第一侧面受力不均造成撕破的风险。
本申请的一些实施例中，第一胶层还包括第三部分和第四部分，第三部分粘接于第三侧面，第四部分粘接于第四侧面，以使第一侧面、位于第一区域处的隔离膜、第三侧面和第四侧面形成一个整体，进一步降低电芯在跌落过程中第一端面处的部分隔离膜向内收缩而造成电芯发生短路的风险。
本申请的一些实施例中，第一极耳伸出第一端面的部分从第二侧面朝向第一侧面弯折设置，以降低第一极耳在第二方向上占用的封装空间，提高电池能量密度。
本申请的一些实施例中，电芯还包括收容电极组件的包装袋和第一极耳引线，第一极耳引线的一端设置在第一表面或第二表面，第一极耳引线的另一端延伸至包装袋外；第二部分的部分粘接在第一极耳引线的表面，或第二胶层部分粘接在第一极耳引线的表面，以降低第一极耳引线与电极组件接触导致短路的风险。
本申请的一些实施例中，电芯还包括第二极耳。第二极耳一端电连接于电极组 件，第二极耳的另一端从第一端面伸出。第二极耳包括第三表面和第四表面，第三表面朝向第一侧面，第四表面背离的第一侧面。第一端面包括第二区域，第二区域位于第三表面和第一侧面之间。第一胶层还从第一区域延伸至第二区域，且部分第一胶层与位于第二区域处的隔离膜粘接，第二胶层还粘接于第四表面的至少部分。第一胶层使位于第一区域的隔离膜、位于第二区域处的隔离膜、以及第一侧面形成一个整体，第二胶层使第一极耳、第二极耳、位于第一端面处的部分隔离膜、以及第二侧面形成一个整体，进而降低电芯在跌落过程中第一端面处的隔离膜向内收缩而造成电芯发生短路的风险，以提高电芯的安全性。
本申请的一些实施例中，电芯还包括第二极耳引线，第二极耳引线的一端设置在第三表面或第四表面，第一胶层部分粘接在第二极耳引线的表面，或第二胶层部分粘接在第二极耳引线的表面，以降低第二极耳引线与电极组件接触导致短路的风险。
本申请的一些实施例中，电芯还包括粘接在第一表面的第三胶层，用于对被第三胶层粘接的第一极耳或第一极耳引线进行保护，降低被第三胶层粘接的第一极耳部位或第一极耳引线部位与电极组件接触导致短路的风险。
本申请的一些实施例中，电芯还包括部分粘接在第一极耳引线表面的第四胶层，且第四胶层一部分设于第一表面和第三胶层之间，第四胶层的至少部分还连接于第三胶层，第四胶层用于封装至少部分第一极耳引线。
本申请的一些实施例中，电芯还包括部分粘接在第二表面的第五胶层，且第五胶层一部分设于第二表面和第二胶层之间，且第五胶层的至少部分粘接于第二胶层，第五胶层用于封装至少部分第一极耳引线。
本申请的一些实施例中，电芯还包括第六胶层，第六胶层粘接于第二端面并从第二端面分别延伸至第一侧面和第二侧面，第三方向垂直于第一方向和第二方向，沿第三方向，第六胶层的宽度为电极组件的宽度的3/4至6/5。第六胶层使位于第二端面处的隔离膜、第一侧面、以及第二侧面形成一个整体，降低电芯在跌落过程中第一区域处的隔离膜向内收缩而造成电芯发生短路的风险。
本申请的一些实施例中，电极组件通过第一极片、隔离膜和第二极片卷绕设置或叠片设置，第一极耳包括多个第一极耳单元，各第一极耳单元的一端与电极组件 的每一层第一极片连接，多个第一极耳单元的另一端焊接在一起。
本申请的实施例还提供一种电池，包括壳体，电池还包括上述任一项实施例中的电芯，电芯设置在壳体内。
本申请的实施例还提供一种用电设备，用电设备包括上述任一项实施例中的电池。
本申请的电芯、以及设有上述电芯的电池和用电设备中，通过第一胶层使位于第一区域处的隔离膜与第一侧面形成一个整体，第二胶层使位于第一端面处的部分隔离膜与第二侧面形成一个整体，以降低电芯在跌落过程中第一端面处的隔离膜向内收缩而造成电芯发生短路的风险，以提高电芯的安全性，进而提升电池和用电设备的使用安全性。
附图说明
图1是本申请的一个实施例的电芯中电极组件的结构示意图。
图2是本申请的一个实施例的电芯中第一胶层的结构示意图。
图3是本申请的一个实施例的电芯中第二胶层的结构示意图。
图4是本申请的一个实施例的电芯中第三部分的结构示意图。
图5是本申请的一个实施例的电芯中包装袋的结构示意图。
图6是本申请的一个实施例的电芯中包装袋的拆分结构示意图。
图7是本申请的一个实施例的电芯中第四部分的结构示意图。
图8是本申请的一个实施例的电芯中第三胶层的第一视角结构示意图。
图9是本申请的一个实施例的电芯中第三胶层的第二视角结构示意图。
图10是本申请的一个实施例的电芯中第六胶层的第一视角结构示意图。
图11是本申请的一个实施例的电芯中第六胶层的第二视角结构示意图。
图12是本申请的一个实施例的电芯中第五部分的结构示意图。
图13是本申请的一个实施例的电芯中第六部分的结构示意图。
图14是本申请的一个实施例的电芯中第九胶层的结构示意图。
图15是图2中沿A-A剖面线的剖视图。
图16是图2中沿B-B剖面线的剖视图。
图17是本申请的一个实施例中用电设备的结构示意图。
主要元件符号说明
电芯                                  100
电池                                  200
用电设备                              300
电极组件                              10
第一侧面                              10a
第二侧面                              10b
第一端面                              10c
第二端面                              10d
第一区域                              10e
第三侧面                              10f
第四侧面                              10g
第二区域                              10h
第一极片                              11
第二极片                              12
隔离膜                                13
第一极耳                              20
第一表面                              21
第二表面                              22
第一极耳单元                          23
第一胶层                              30
第一部分                              31
第二部分                              32
第三部分                              33
第四部分                              34
第二胶层                              40
第一极耳引线                           51
第二极耳引线                           52
第二极耳                               60
第三表面                               61
第四表面                               62
第三胶层                               71
第四胶层                               72
第五胶层                               73
第六胶层                               74
第五部分                               741
第六部分                               742
第七胶层                               75
第八胶层                               76
第九胶层                               77
包装袋                                 80
第一方向                               X
第二方向                               Z
第三方向                               Y
如下具体实施方式将结合上述附图进一步说明本申请。
具体实施方式
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描述，显然，所描述的实施例仅是本申请一部分实施例，而不是全部的实施例。
需要说明的是，当一个元件被认为是“连接”另一个元件，它可以是直接连接到另一个元件或者可能同时存在居中设置的元件。当一个元件被认为是“设置在”另一个元件，它可以是直接设置在另一个元件上或者可能同时存在居中设置的元件。
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。本文中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。本文所使用的术语“和/或”包括一个或多个相关的所列项目的任意的和所有的组合。本文所使用的术语“垂直的”、“水平的”、“左”、“右”、“顶”、“底”以及类似的表述只是为了说明的目的，并不用于限制本申请。
可以理解，当两元件平行/垂直设置时沿同一方向设置，两元件之间可存在一定的夹角，两元件之间的允许存在0-±10％的公差，两元件大于、等于或小于允许存在0-±10％的公差。
本申请的实施例提供一种电芯，包括电极组件和第一极耳。电极组件包括第一极片、第二极片和设置在第一极片与第二极片之间的隔离膜。电极组件的外表面包括沿第一方向相对设置的第一侧面和第二侧面、以及沿第二方向相对设置的第一端面和第二端面。第一极耳的一端电连接于第一极片，第一极耳的另一端从第一端面伸出。第一极耳包括第一表面和第二表面，第一表面朝向第一侧面，第二表面背离第一侧面。第一端面包括第一区域，第一区域位于第一表面和第一侧面之间。电芯还包括第一胶层和第二胶层。第一胶层粘贴于第一区域并从第一区域延伸至第一侧面，且部分第一胶层与位于第一区域处的隔离膜粘接。第二胶层粘接于第二表面的至少部分并从第二表面延伸至第二侧面，且部分第二胶层与位于第一端面处的隔离膜粘接。
通过第一胶层使位于第一区域处的隔离膜与第一侧面形成一个整体，第二胶层使位于第一端面处的部分隔离膜与第二侧面形成一个整体，以降低电芯在跌落过程中第一端面处的隔离膜向内收缩而造成电芯发生短路的风险，提高电芯的安全性。
结合附图，对本申请的实施例作进一步的说明。
请参阅图1，本申请的一个实施例提供一种电芯100，电芯100包括电极组件10和第一极耳20。电极组件10包括第一极片11、第二极片12和设置在第一极片11与第二极片12之间的隔离膜13(参图15、16)。
电极组件10的外表面包括沿第一方向X相对设置的第一侧面10a和第二侧面10b、以及沿第二方向Z相对设置的第一端面10c和第二端面10d。
第一极耳20的一端电连接于电极组件10，第一极耳20的另一端从第一端面10c伸出。在一些实施例中，第一极耳20伸出第一端面10c的部分从第二侧面10b 朝向第一侧面10a弯折设置，以降低第一极耳20在第二方向Z上占用的封装空间，提高电池能量密度。
第一极耳20包括第一表面21和第二表面22，第一表面21朝向第一侧面10a，第二表面22背离第一侧面10a。第一端面10c包括第一区域10e，第一区域10e位于第一表面21和第一侧面10a之间。
请一并参阅图2、图3、图15和16，电芯100还包括第一胶层30和第二胶层40。第一胶层30粘贴于第一区域10e并从第一区域10e延伸至第一侧面10a，且第一胶层30的部分与位于第一区域10e处的隔离膜13的部分粘接，以使位于第一区域10e处的隔离膜13与第一侧面10a形成一个整体，从而，隔离膜13受到冲击时，由于隔离膜13与第一胶层30粘接一起，能够阻止隔离膜13收缩，进而能够降低电芯100在跌落过程中第一区域10e处的隔离膜13向内收缩而造成电芯100发生短路的风险。
在一些实施例中，沿第二方向Z，第一胶层30在第一侧面10a的高度范围为3mm至15mm。可选地，第一胶层30在第一侧面10a的高度为3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14mm、15mm等中的一种。
第二胶层40粘接于第二表面22的至少部分并从第二表面22延伸至第二侧面10b，且部分第二胶层40与位于第一端面10c处的部分隔离膜13粘接，以使位于第一端面10c处的部分隔离膜13与第二侧面10b形成一个整体，降低电芯100在跌落过程中第一端面10c处的部分隔离膜13向内收缩而造成电芯100发生短路的风险。
在一些实施例中，第二表面22与第二侧面10b在第二方向Z上相离，在第一端面10c上，第二表面22与第二侧面10b之间区域中的隔离膜13与第二胶层40粘接。可以理解的是，在其他一些实施例中，第二表面22与第二侧面10b在第二方向Z上齐平，则第二胶层40从第二表面22直接延伸至第二侧面10b。
在一些实施例中，沿第二方向Z，第二胶层40在第二侧面10b的高度范围为3mm至15mm。可选地，第二胶层40在第二侧面10b的高度为3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14mm、15mm等中的一 种。
上述电芯100中，第一胶层30使位于第一区域10e处的隔离膜13与第一侧面10a形成一个整体，第二胶层40使位于第一端面10c处的部分隔离膜13与第二侧面10b形成一个整体，以降低电芯100在跌落过程中第一端面10c处的隔离膜13向内收缩而造成电芯100发生短路的风险，以提高电芯100的安全性。
请继续参阅图2和图3，在一些实施例中，第三方向Y垂直于第一方向X和第二方向Z。第三方向Y为第一胶层30与电极组件10宽度方向，沿第三方向Y，第一胶层30的宽度与电极组件10宽度的比值范围为3/4至6/5，即第一胶层30的宽度与第一侧面10a宽度的比值范围为3/4至6/5；和/或，第二胶层40的宽度与电极组件10宽度的比值范围为3/4至6/5，即第二胶层40的宽度与第二侧面10b宽度的比值范围为3/4至6/5。当该比值范围小于3/4时，第一胶层30或第二胶层40与隔离膜13之间的粘接面积较小，两者之间的粘接稳定性较弱，当电芯100跌落时，较难减弱电解液对第一端面10c处的隔离膜13的冲击力，进而较难阻止第一端面10c处的隔离膜13向内收缩而造成电芯100发生短路的风险；而当该比值范围大于6/5时，会使电极组件10在其宽度方向上与包装袋80的内表面之间的间距过大，影响电芯100的能量密度。
可选地，第一胶层30的宽度与电极组件10宽度的比值为3/4、4/5、17/20、9/10、19/20、1、21/20、11/10、23/20、6/5等中的一种；第二胶层40的宽度与电极组件10宽度的比值为3/4、4/5、17/20、9/10、19/20、1、21/20、11/10、23/20、6/5等中的一种。
当第二胶层40的宽度与电极组件10宽度的比值为3/4至1时，或第二胶层40的宽度与电极组件10宽度的比值为1至6/5时，与第一胶层30产生的效果相同，在此不作赘述。
请继续参阅图2和图3，在一些实施例中，第一胶层30包括第一部分31和与第一部分31连接的第二部分32。第一部分31分别粘接在第一侧面10a和第一区域10e，第一部分31用于与位于第一区域10e处的隔离膜13粘接，并使位于第一区域10e处的隔离膜13与第一侧面10a形成一个整体。沿第二方向Z，第二部分32部分粘接在第一表面21，进一步使第一极耳20、位于第一区域10e处的隔离膜 13、以及第一侧面10a形成一个整体，进而降低电芯100在跌落过程中第一端面10c处的隔离膜13向内收缩而造成电芯100发生短路的风险，以提高电芯100的安全性。
请一并参阅图4和图5，在一些实施例中，电极组件10还包括沿第三方向Y相对设置的第三侧面10f和第四侧面10g。在第三方向Y上，第一胶层30相对应的两端分别延伸至与第三侧面10f和第四侧面10g齐平。即第一胶层30的宽度与第一侧面10a宽度的比值为1，以使第一侧面10a在受到第一胶层30的拉力时可均匀分摊拉力，降低第一侧面10a因受力不均造成撕破的风险。
在一些实施例中，第一胶层30还包括第三部分33和第四部分34。第三部分33粘接于第三侧面10f，第四部分34粘接于第四侧面10g，以使第一侧面10a、位于第一区域10e处的隔离膜13、第三侧面10f和第四侧面10g形成一个整体，进一步降低电芯100在跌落过程中第一端面10c处的部分隔离膜13向内收缩而造成电芯100发生短路的风险。
在一些实施例中，第三部分33连接第一部分31在第三方向Y上的一端，第三部分33朝向第三侧面10f弯折设置且粘接于第三侧面10f。第四部分34连接第一部分31在第三方向Y上的另一端，第四部分34朝向第四侧面10g弯折设置且粘接于第四侧面10g。
请一并参阅图1、图6和图7，在一些实施例中，电芯100还包括收容电极组件10的包装袋80。包装袋80包括第一凹部81和第二凹部82，第一凹部81和第二凹部82彼此相对并共同围成一容纳空间以收容电极组件10。第一凹部81的凹陷深度大于第二凹部82，第一侧面10a与第一凹部81的底面相对，第二侧面10b与第二凹部82的底面相对。
请再次参阅图2和图3，在一些实施例中，电芯100还包括第一极耳引线51。第一极耳引线51的一端设置在第一表面21或第二表面22，第一极耳引线51的另一端延伸至包装袋80外。
具体地，当第一极耳引线51的一端设置在第一表面21时，第二部分32部分粘接在第一极耳引线51的表面，并使在第一极耳引线51的至少部分位于第一表面21和第二部分32之间，以降低第一极耳引线51与电极组件10接触导致短路的风 险。
当第一极耳引线51的一端设置在第二表面22时，第二胶层40部分粘接在第一极耳引线51的表面，并使在第一极耳引线51的至少部分位于第二表面22和第二胶层40之间，以降低第一极耳引线51与电极组件10接触导致短路的风险。
请再次参阅图1，在一些实施例中，电芯100还包括第二极耳60，第二极耳60一端电连接于电极组件10，第二极耳60的另一端从第一端面10c伸出。在一些实施例中，第二极耳60伸出第一端面10c的部分从第二侧面10b朝向第一侧面10a弯折设置，以降低第一极耳20在第二方向Z上占用的封装空间，提高电池能量密度。
第二极耳60包括第三表面61和第四表面62，第三表面61朝向第一侧面10a，第四表面62背离的第一侧面10a。第一端面10c包括第二区域10h，第二区域10h位于第三表面61和第一侧面10a之间。
请再次参阅图2和图3，第一胶层30还从第一区域10e延伸至第二区域10h，且部分第一胶层30与位于第二区域10h的隔离膜13粘接，以使位于第一区域10e和第二区域10h处的隔离膜13与第一侧面10a形成一个整体，降低电芯100在跌落过程中第一区域10e处的隔离膜13向内收缩而造成电芯100发生短路的风险。
在一些实施例中，第一部分31分别粘接在第一侧面10a、第一区域10e和第二区域10h，第一部分31用于与位于第一区域10e处的隔离膜13、以及位于第二区域10h处的隔离膜13粘接，并使位于第一区域10e的隔离膜13、位于第二区域10h处的隔离膜13、以及第一侧面10a形成一个整体。沿第三方向Y，第二部分32从第一表面21延伸至第三表面61，进一步使第一极耳20、第二极耳60、位于第一区域10e处的隔离膜13、位于第二区域10h处的隔离膜13、以及第一侧面10a形成一个整体，进而降低电芯100在跌落过程中第一端面10c处的隔离膜13向内收缩而造成电芯100发生短路的风险，以提高电芯100的安全性。
在一些实施例中，第二胶层40还粘接于第四表面62的至少部分，以使第一极耳20、第二极耳60、位于第一端面10c处的部分隔离膜13、以及第二侧面10b形成一个整体，进而降低电芯100在跌落过程中第一端面10c处的隔离膜13向内收缩而造成电芯100发生短路的风险，提高电芯100的安全性。
请再次参阅图1、图2、图3和图6，在一些实施例中，电芯100还包括第二极耳引线52。第二极耳引线52的一端设置在第三表面61或第四表面62，第一极耳引线51的另一端延伸至包装袋外。
具体地，当第二极耳引线52的一端设置在第三表面61时，第一胶层30部分粘接在第二极耳引线52的表面，并使在第二极耳引线52的至少部分位于第三表面61和第一胶层30之间，以降低第二极耳引线52与电极组件10接触导致短路的风险。具体地，第一胶层30的第二部分32部分粘接在第一极耳引线51的表面。
当第二极耳引线52的一端设置在第四表面62时，第二胶层40部分粘接在第二极耳引线52的表面，并使在第二极耳引线52的至少部分位于第四表面62和第二胶层40之间，以降低第二极耳引线52与电极组件10接触导致短路的风险。
请一并参阅图8和图9，在一些实施例中，电芯100还包括粘接在第一表面21的第三胶层71，用于对被第三胶层71粘接的第一极耳20或第一极耳引线51进行保护，降低被第三胶层71粘接的第一极耳20部位或第一极耳引线51部位与电极组件10接触导致短路的风险。可选地，第三胶层71的厚度为30μm。
在一些实施例中，沿第三方向Y，第三胶层71从第一表面21延伸至第三表面61，用于对被第三胶层71粘接的第二极耳60或第二极耳引线52进行保护，降低被第三胶层71粘接的第二极耳60部位或第二极耳引线52部位与电极组件10接触导致短路的风险。
在一些实施例中，粘接在第一表面21的第三胶层71和粘接占第三表面61的第三胶层71一体设置。可以理解的是，在其他实施例中，粘接在第一表面21的第三胶层71和粘接占第三表面61的第三胶层71分体设置。
请继续参阅图8和图9，在一些实施例中，电芯100还包括部分粘接在第一极耳引线51表面的第四胶层72，且第四胶层72一部分设于第一表面21和第三胶层71之间，第四胶层72的至少部分还连接于第三胶层71，第四胶层72用于封装至少部分第一极耳引线51。
在一些实施例中，电芯100还包括部分粘接在第二表面22的第五胶层73，且第五胶层73一部分设于第二表面22和第二胶层40之间，且第五胶层73的至少部分粘接于第二胶层40，第五胶层73用于封装至少部分第二表面22。
在一些实施例中，电芯100还包括部分粘接在第二极耳引线52表面的第七胶层75，且第七胶层75一部分设于第三表面61和第三胶层71之间，第七胶层75的至少部分还连接于第三胶层71，第七胶层75用于封装至少部分第三表面61。
在一些实施例中，电芯100还包括部分粘接在第四表面62的第八胶层76，且第八胶层76一部分设于第四表面62和第二胶层40之间，且第八胶层76的至少部分粘接于第二胶层40，第八胶层76用于封装至少部分第四表面62。
在一些实施例中，第四胶层72、第五胶层73、第七胶层75和第八胶层76可由极耳胶制成，用于在包装袋封装过程中与包装袋熔融结合，提高电芯100的密封性。
请一并参阅图10和图11，在一些实施例中，电芯100还包括第六胶层74，第六胶层74粘接于第二端面10d并从第二端面10d分别延伸至第一侧面10a和第二侧面10b，以使位于第二端面10d处的隔离膜13、第一侧面10a、以及第二侧面10b形成一个整体，降低电芯100在跌落过程中第一区域10e处的隔离膜13向内收缩而造成电芯100发生短路的风险。
沿第三方向Y，第六胶层74的宽度为电极组件10的宽度的3/4至6/5。当该比值范围小于3/4时，第六胶层74与第二端面10d处的隔离膜13之间的粘接面积较小，两者之间的粘接稳定性较弱，当电芯100跌落时，较难减弱电解液对第二端面10d处的隔离膜13的冲击力，进而较难阻止第二端面10d处的隔离膜13向内收缩而造成电芯100发生短路的风险；而当该比值范围大于6/5时，会使电极组件10在其宽度方向上与包装袋80的内表面之间的间距过大，影响电芯100的能量密度。
可选地，第六胶层74的宽度和电极组件10宽度的比值为3/4、4/5、17/20、9/10、19/20、1、21/20、11/10、23/20、6/5等中的一种。
在一些实施例中，在第三方向Y上，第六胶层74相对应的两端分别延伸至与第三侧面10f和第四侧面10g齐平。即第六胶层74的宽度与电极组件10宽度的比值为1，以使第一侧面10a和第二侧面10b在受到第六胶层74的拉力时可均匀分摊拉力，降低第一侧面10a和第二侧面10b受力不均造成撕破的风险。
请一并参阅图12和图13，在一些实施例中，第六胶层74还包括第五部分741和第六部分742。第五部分741粘接于第三侧面10f，第六部分742粘接于第四侧 面10g，以使第一侧面10a、第二侧面10b、位于第二端面10d处的隔离膜13、第三侧面10f和第四侧面10g形成一个整体，进一步降低电芯100在跌落过程中第二端面10d处的隔离膜13向内收缩而造成电芯100发生短路的风险。
在一些实施例中，沿第二方向Z，第六胶层74在第一侧面10a上的高度范围为3mm至15mm。可选地，第六胶层74在第一侧面10a上的高度为3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14mm、15mm等中的一种。
沿第二方向Z，第六胶层74在第二侧面10b上的高度范围为3mm至15mm。可选地，第六胶层74在第二侧面10b上的高度为3mm、4mm、5mm、6mm、7mm、8mm、9mm、10mm、11mm、12mm、13mm、14mm、15mm等中的一种。
可以理解的是，在一些实施例中，第二极耳60一端电连接于电极组件10，第二极耳60的另一端从第二端面10d伸出，对应的，电芯100包括与第一胶层30和第二胶层40类似的胶层结构，以使位于第二端面10d处的隔离膜13、第一侧面10a、以及第二侧面10b形成一个整体，降低电芯100在跌落过程中第一区域10e处的隔离膜13向内收缩而造成电芯100发生短路的风险。
请参阅图14，在一些实施例中，电芯100还包括第九胶层77，第九胶层77粘接于第一侧面10a，用于在包装袋封装过程中与包装袋内壁粘接，降低跌落过程中电极组件10在包装袋中位移，减少对电芯的冲击。
在一些实施例中，沿第二方向Z，第九胶层77的高度范围为10mm至70mm；沿第三方向Y，第九胶层77的宽度范围为10mm至70mm。
在一些实施例中，第九胶层77的高度为10mm、20mm、30mm、40mm、50mm、60mm、70mm等中的一种；第九胶层77的宽度为10mm、20mm、30mm、40mm、50mm、60mm、70mm等中的一种。
请参阅图15，在一些实施例中，电极组件10通过第一极片11、隔离膜13和第二极片12卷绕设置或叠片设置。可选地，第一极片11呈正极极性，第二极片12呈负极极性；或第一极片11呈负极极性，第二极片12呈正极极性。
在一些实施例中，第一极耳20包括多个第一极耳单元23，各第一极耳单元23的一端与电极组件10的每一层第一极片11连接，多个第一极耳单元23的另一端 焊接在一起。第一极耳引线51连接于多个第一极耳单元23的焊接处。
在一些实施例中，第二极耳60包括多个第二极耳单元(图未示)，各第二极耳单元的一端与电极组件10的每一层第二极片12连接，多个第二极耳单元的另一端焊接在一起。第二极耳引线52连接于多个第二极耳单元的焊接处。从图15可知，第一胶层30和/或第二胶层40可粘贴在最外侧的第一极耳单元23上，也可以粘贴在隔离膜13在Y方向上超出第一极耳单元23的部分，以增强第一胶层30和/或第二胶层40与第一区域10e处隔离膜13的粘接性。
请参阅图16，在一些实施例中，第二部分32和第二胶层40之间与第一极耳20和第二极耳60相离的区域中，第二部分32和第二胶层40相互连接并朝向第一侧面10a弯折设置。且部分第一胶层30和/或第二胶层40与第一区域10e处非极耳区的隔离膜13相粘接来提高第一胶层30和/或第二胶层40与该处隔离膜13的粘接面积，进一步提高电芯100的安全性。
在一些实施例中，第一胶层30由高粘性亚克力体系绿胶或者聚苯乙烯异戊二烯共聚物体系金色胶纸制成，第一胶层30的厚度范围为10μm至30μm。
在一些实施例中，第一胶层30的厚度为10μm、11μm、12μm、13μm、14μm、15μm、16μm、17μm、19μm、19μm、20μm、21μm、22μm、23μm、24μm、25μm、26μm、27μm、29μm、29μm、30μm等中的一种。
在一些实施例中，第二胶层40由高粘性亚克力体系绿胶或者聚苯乙烯异戊二烯共聚物体系胶纸制成，第二胶层40的厚度范围为10μm至30μm。
在一些实施例中，第二胶层40的厚度为10μm、11μm、12μm、13μm、14μm、15μm、16μm、17μm、19μm、19μm、20μm、21μm、22μm、23μm、24μm、25μm、26μm、27μm、29μm、29μm、30μm等中的一种。
在一些实施例中，第九胶层77由苯乙烯一异戊二烯一苯乙烯热熔双面胶制成。
请参阅图17，本申请还提供一种电池200，包括壳体(图未示)，电池200还包括上述任一实施例中任一种电芯100，电芯100设置在壳体内，能提高电池200的安全性。在一些实施例中，电池200还包括保护板(图未示)，电芯100和保护板均设于壳体中，电芯100连接于保护板，保护板用于监控并管理电池200中的电芯100。
请继续参阅图17，本申请还提供一种用电设备300，用电设备300包括上述任一实施例中的电池200，能提高用电设备300安全性。用电设备300可以为手机、平板电脑等电子设备，或电动汽车等移动设备。
上述电芯100中，以及设有电芯100的电池200和用电设备300中，第一胶层30使位于第一区域10e处的隔离膜13与第一侧面10a形成一个整体，第二胶层40使位于第一端面10c处的部分隔离膜13与第二侧面10b形成一个整体，以降低电芯100在跌落过程中第一端面10c处的隔离膜13向内收缩而造成电芯100发生短路的风险，提高电芯100的安全性。
另外，本领域技术人员还可在本申请精神内做其它变化，当然，这些依据本申请精神所做的变化，都应包含在本申请所公开的范围。

Claims (16)

  1. 一种电芯，包括电极组件和第一极耳，所述电极组件包括第一极片、第二极片和设置在所述第一极片与所述第二极片之间的隔离膜，所述电极组件的外表面包括沿第一方向相对设置的第一侧面和第二侧面、以及沿第二方向相对设置的第一端面和第二端面；
    所述第一极耳的一端电连接于所述第一极片，所述第一极耳的另一端从所述第一端面伸出；
    所述第一极耳包括第一表面和第二表面，所述第一表面朝向所述第一侧面，所述第二表面背离所述第一侧面，所述第一端面包括第一区域，所述第一区域位于所述第一表面和所述第一侧面之间；
    其特征在于：所述电芯还包括：
    第一胶层，粘贴于所述第一区域并从所述第一区域延伸至所述第一侧面，且部分所述第一胶层与位于所述第一区域处的所述隔离膜粘接；和
    第二胶层，粘接于所述第二表面的至少部分并从所述第二表面延伸至所述第二侧面，且部分所述第二胶层与位于所述第一端面处的所述隔离膜粘接。
  2. 如权利要求1所述的电芯，其特征在于：第三方向垂直于所述第一方向和所述第二方向，沿所述第三方向，所述第一胶层的宽度与所述电极组件宽度的比值范围为3/4至6/5；和/或，所述第二胶层的宽度与所述电极组件宽度的比值范围为3/4至6/5。
  3. 如权利要求1所述的电芯，其特征在于：所述第一胶层包括第一部分和与所述第一部分连接的第二部分，所述第一部分分别粘接在所述第一侧面和所述第一区域，沿所述第一方向，所述第二部分的部分粘接在所述第一表面。
  4. 如权利要求1或2所述的电芯，其特征在于：所述电极组件还包括沿第三方向相对设置的第三侧面和第四侧面，在所述第三方向，所述第一胶层相对应的两端分别延伸至与所述第三侧面和所述第四侧面齐平。
  5. 如权利要求4所述的电芯，其特征在于：所述第一胶层还包括第三部分和第四部分，所述第三部分粘接于所述第三侧面，所述第四部分粘接于所述第四侧 面。
  6. 如权利要求1所述的电芯，其特征在于：所述第一极耳伸出所述第一端面的部分从所述第二侧面朝向所述第一侧面弯折设置。
  7. 如权利要求3所述的电芯，其特征在于：所述电芯还包括收容所述电极组件的包装袋和第一极耳引线，所述第一极耳引线的一端设置在所述第一表面或所述第二表面，所述第一极耳引线的另一端延伸至所述包装袋外；所述第二部分的部分粘接在所述第一极耳引线的表面，或所述第二胶层部分粘接在所述第一极耳引线的表面。
  8. 如权利要求1所述的电芯，其特征在于：所述电芯还包括第二极耳，所述第二极耳一端电连接于所述电极组件，所述第二极耳的另一端从所述第一端面伸出；所述第二极耳包括第三表面和第四表面，所述第三表面朝向所述第一侧面，所述第四表面背离所述的第一侧面，所述第一端面包括第二区域，所述第二区域位于所述第三表面和所述第一侧面之间，
    所述第一胶层还从所述第一区域延伸至所述第二区域，且部分所述第一胶层与位于所述第二区域处的隔离膜粘接，所述第二胶层还粘接于所述第四表面的至少部分。
  9. 如权利要求8所述的电芯，其特征在于：所述电芯还包括第二极耳引线，所述第二极耳引线的一端设置在所述第三表面或所述第四表面，所述第一胶层部分粘接在所述第二极耳引线的表面，或所述第二胶层部分粘接在所述第二极耳引线的表面。
  10. 如权利要求1或3所述的电芯，其特征在于：所述电芯还包括粘接在所述第一表面的第三胶层。
  11. 如权利要求10所述的电芯，其特征在于：所述电芯还包括部分粘接在所述第一极耳引线表面的第四胶层，且所述第四胶层一部分设于所述第一表面和所述第三胶层之间，所述第四胶层的至少部分还连接于所述第三胶层。
  12. 如权利要求10所述的电芯，其特征在于：所述电芯还包括部分粘接在所述第二表面的第五胶层，且所述第五胶层一部分设于所述第二表面和所述第二胶层之间，且所述第五胶层的至少部分粘接于所述第二胶层。
  13. 如权利要求1所述的电芯，其特征在于：所述电芯还包括第六胶层，所述第六胶层粘接于所述第二端面并从所述第二端面分别延伸至所述第一侧面和所述第二侧面，第三方向垂直于所述第一方向和所述第二方向，沿所述第三方向，所述第六胶层的宽度为所述电极组件的宽度的3/4至6/5。
  14. 如权利要求1所述的电芯，其特征在于：所述电极组件通过所述第一极片、所述隔离膜和所述第二极片卷绕设置或叠片设置，所述第一极耳包括多个第一极耳单元，各个所述第一极耳单元的一端与所述电极组件的每一层所述第一极片连接，所述多个第一极耳单元的另一端焊接在一起。
  15. 一种电池，包括壳体，其特征在于：所述电池还包括如权利要求1至14中任一项所述的电芯，所述电芯设置在所述壳体内。
  16. 一种用电设备，其特征在于：所述用电设备包括如权利要求15所述的电池。
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