WO2023122881A1 - 电池及包含其的电子装置 - Google Patents

电池及包含其的电子装置 Download PDF

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Publication number
WO2023122881A1
WO2023122881A1 PCT/CN2021/141633 CN2021141633W WO2023122881A1 WO 2023122881 A1 WO2023122881 A1 WO 2023122881A1 CN 2021141633 W CN2021141633 W CN 2021141633W WO 2023122881 A1 WO2023122881 A1 WO 2023122881A1
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WO
WIPO (PCT)
Prior art keywords
pole piece
layer
wall
battery according
electrode assembly
Prior art date
Application number
PCT/CN2021/141633
Other languages
English (en)
French (fr)
Inventor
李勇
肖良针
曾巧
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 PCT/CN2021/141633 priority Critical patent/WO2023122881A1/zh
Priority to CN202180034146.6A priority patent/CN115668575A/zh
Publication of WO2023122881A1 publication Critical patent/WO2023122881A1/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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of energy storage devices, in particular to a battery and an electronic device including the battery.
  • Lithium-ion batteries have many advantages such as high energy density, long cycle life, high nominal voltage, low self-discharge rate, small size, and light weight, and have a wide range of applications in the field of consumer electronics. With the rapid development of electric vehicles and mobile electronic devices in recent years, people have higher and higher demands on the energy density, service life, and manufacturing efficiency of batteries. Therefore, the structure of batteries needs to be continuously optimized.
  • An object of the present application is to propose a battery which can increase the service life of the casing.
  • the first aspect of the present application provides a battery, including an electrode assembly and a casing for accommodating the electrode assembly.
  • the electrode assembly includes a pole piece and a first layer comprising an insulating material.
  • the pole piece includes a positive pole piece and a negative pole piece, the first layer is arranged between the positive pole piece and the negative pole piece, the negative pole piece is located at the outermost layer of the pole piece, and the negative pole piece includes a first side extending along a first direction and a second side extending along the second direction, the first direction is perpendicular to the second direction, the first side is connected to the second side through the third side, and the first side intersects with the third side to form a first intersection point.
  • the casing includes a first metal layer and a second layer including a polymer material arranged in a stack, and the second layer is arranged closer to the electrode assembly relative to the first metal layer.
  • the casing also includes a first wall, a second wall and a third wall connected to each other, the first wall and the second wall are connected through the first arc wall, and the first wall and the third wall are connected through the second arc wall , the second wall and the third wall are connected by the third arc wall, the arc radius of the first arc wall is R 1 , the arc radius of the second arc wall is R 2 , the first arc wall
  • the line connecting the midpoints of each place, the line connecting the midpoints of the second arc wall and the line connecting the midpoints of the third arc wall intersect to form a second intersection point.
  • the electrode assembly further includes a first surface and a second surface oppositely disposed in a third direction, and the third direction is perpendicular to the first direction and the second direction.
  • the projection of the second intersection point on the first surface or the second surface of the electrode assembly where the part of the first intersection point is located on the negative electrode sheet is the third intersection point, and the distance L between the third intersection point and the first intersection point satisfies the relationship L ⁇ 0.8(R 1 +R 2 ).
  • the present application forms a notch-like structure by setting a third side at the corner position of the end end of the negative pole piece, so that the angle at the end end of the negative pole piece is far away from the corner position of the housing; and the corner position of the housing
  • the projection (third intersection point O') formed by the center of the sphere on the first surface or the second surface of the electrode assembly where the end end of the negative pole piece is located satisfies the relationship with the first intersection point A at the corner of the end end of the negative pole piece Formula L ⁇ 0.8(R 1 +R 2 ), which can reduce the risk of the negative pole piece piercing the second layer of the shell, thereby reducing the risk of the first metal layer of the shell being in contact with the negative pole piece or the electrolyte, improving Corrosion, improve the service life of the shell.
  • connection between the third side and the first side and the connection between the third side and the second side are arc-shaped transition connections.
  • the included angle at the junction of the third side and the first side is an obtuse angle or an acute angle
  • the included angle at the junction of the third side and the second side is an obtuse angle or an acute angle
  • one of the connection between the third side and the first side and the connection between the third side and the second side is an arc transition connection
  • the included angle of the other is an obtuse angle or an acute angle
  • the third side includes at least one of a curve and a straight line.
  • the negative electrode sheet, the first layer and the positive electrode sheet are stacked and wound to form an electrode assembly
  • the electrode assembly further includes a first planar portion and a second planar portion oppositely arranged in the third direction and connected to A first curved portion and a second curved portion disposed opposite to each other in the first direction between the first planar portion and the second planar portion.
  • the end end of the negative pole piece is located in the first bending portion, so that the angle at the corner position of the end end of the negative pole piece can be far away from the corner position of the casing, so that the negative pole piece can be lowered. Risk of piercing the second layer of the casing.
  • the ending end of the positive pole piece is located at the first bent portion.
  • the end end of the first layer is located at the first bend.
  • the first intersection point is located on the first planar portion.
  • the first layer is located at the outermost layer of the electrode assembly, and the electrode assembly further includes a third layer comprising an insulating material, the third layer is connected to the first layer and located at the first bending portion.
  • the electrode assembly can be firmly connected to the casing.
  • the surface of the first layer is covered with a coating.
  • the coating By setting the coating, the safety performance and mechanical performance of the first layer can be improved, which contributes to the improvement of corrosion.
  • the negative electrode sheet includes a second metal layer, a first conductive material layer, and a second conductive material layer, the second metal layer includes a first surface and a second surface oppositely arranged, and the negative electrode sheet further includes In the winding direction of the electrode assembly opposite to the starting end and the ending end, the first conductive material layer is continuously arranged on the first surface from the starting end of the negative electrode sheet to the ending end of the negative electrode sheet, and the second conductive material layer is arranged from the negative electrode to the ending end of the negative electrode sheet.
  • the starting end of the pole piece is continuously arranged on the second surface to the ending end of the negative pole piece.
  • the negative electrode sheet further includes a plurality of negative electrode tabs extending from one side of the second metal layer.
  • the negative pole piece further includes a first adapter piece, and a plurality of negative pole tabs are bent in the casing to form a first tab group, and the first tab group is connected to the first adapter piece, An end of the first adapter piece away from the first tab group protrudes out of the casing.
  • the positive electrode sheet includes a third metal layer, a third conductive material layer, and a fourth conductive material layer
  • the third metal layer includes a third surface and a fourth surface oppositely arranged
  • the positive electrode sheet further includes In the winding direction of the electrode assembly opposite to the starting end and the ending end, the third conductive material layer is continuously arranged on the third surface from the starting end of the positive electrode sheet to the ending end of the positive electrode sheet
  • the fourth conductive material layer is arranged on the third surface from the positive electrode sheet to the end end of the positive electrode sheet.
  • the starting end of the pole piece is continuously arranged on the fourth surface to the ending end of the positive pole piece.
  • the positive pole piece includes a plurality of positive tabs extending from one side of the third metal layer.
  • the positive pole piece further includes a second adapter piece, and a plurality of positive pole tabs are bent in the casing to form a second tab group, and the second tab group is connected to the second adapter piece, An end of the second adapter piece away from the second tab group protrudes out of the casing.
  • the shell has a thickness ranging from 80 ⁇ m to 150 ⁇ m.
  • the first metal layer includes aluminum
  • the polymer material includes polyethylene, polypropylene, ethylene propylene copolymer, polyethylene modified material or polypropylene modified material.
  • the second metal layer comprises copper.
  • the second aspect of the present application further provides an electronic device, including the above-mentioned battery.
  • FIG. 1 is a schematic diagram of a battery provided by an embodiment of the present application.
  • Fig. 2 is a schematic partial cross-sectional view of the casing of the battery shown in Fig. 1 along II-II;
  • Fig. 3 is a schematic cross-sectional view along III-III of the electrode assembly of the battery shown in Fig. 1;
  • Figure 4 is a partial top view of part A-A of the battery shown in Figure 1;
  • 5A is a top view of the negative pole piece of the electrode assembly shown in FIG. 3;
  • 5B is a schematic cross-sectional view of the negative pole piece of the electrode assembly shown in FIG. 3;
  • Figure 6 is a schematic cross-sectional view of the battery shown in Figure 1 along IV-IV;
  • FIG. 7A is a top view of the positive pole piece of the electrode assembly shown in FIG. 3;
  • FIG. 7B is a schematic cross-sectional view of the positive pole piece of the electrode assembly shown in FIG. 3;
  • Fig. 8 is a schematic cross-sectional view of the battery shown in Fig. 1 along VIII-VIII;
  • Fig. 9A is a schematic cross-sectional view of an electrode assembly provided by another embodiment of the present application, and the cross-sectional schematic view is taken in the same direction as III-III in Fig. 1;
  • Fig. 9B is a top view of the negative pole piece of the electrode assembly provided by another embodiment of the present application.
  • Fig. 9C is a top view of the negative pole piece of the electrode assembly provided by another embodiment of the present application.
  • Fig. 9D is a top view of the negative pole piece of the electrode assembly provided by another embodiment of the present application.
  • Fig. 10 is a partial top view of a battery provided by another embodiment of the present application, and the position of the part shown in the partial top view in the battery shown in Fig. 10 is the same as that of part A-A in Fig. 1;
  • Fig. 11 is a partial top view of a battery provided by another embodiment of the present application, and the position of the part shown in the partial top view in the battery shown in Fig. 11 is the same as that of part A-A in Fig. 1;
  • Fig. 12A is a partial top view of a battery provided in another embodiment of the present application, and the parts shown in the partial top view are in the same position as the A-A part in Fig. 1 in the battery shown in Fig. 12A;
  • Fig. 12B is a partial top view of the battery provided by another embodiment of the present application, and the part shown in the partial top view is in the same position as the part A-A in Fig. 1 in the battery shown in Fig. 12B;
  • Fig. 12C is a top view of the positive pole piece of the electrode assembly provided by another embodiment of the present application.
  • FIG. 13 is a schematic diagram of an electronic device provided by an embodiment of the present application.
  • FIG. 14 is a partial top view of the battery provided in Comparative Example 1 of the present application. The parts shown in the partial top view are located in the same position as A-A in FIG. 1 in the battery shown in FIG. 14 .
  • Second plane part 103 Second plane part 103
  • Second Wall 202 Second Wall 202
  • the third metal layer 121 is the third metal layer 121 .
  • the third side 121a is a first side of the third side 121a.
  • the third layer 30 is the third layer 30
  • an embodiment of the present application provides a battery 100 , including an electrode assembly 10 , an electrolyte (not shown), and a casing 20 for accommodating the electrode assembly 10 and the electrolyte.
  • the first adapter piece 136 and the second adapter piece 126 of the electrode assembly 10 protrude from one end of the casing 20 to connect with external components.
  • the casing 20 may include a second layer 21 , a first metal layer 22 and a fourth layer 23 which are sequentially stacked.
  • the second layer 21 is disposed closer to the electrode assembly 10 relative to the first metal layer 22 .
  • the fourth layer 23 is located on the outermost side of the casing 20 and is exposed to the external environment.
  • the material of the second layer 21 may be any material suitable for contacting and accommodating the electrode assembly 10 in the art.
  • the second layer 21 comprises a polymer material, which may be polyethylene, polypropylene, ethylene propylene copolymer, polyethylene modified material or polypropylene modified material.
  • the first metal layer 22 contains aluminum.
  • the material of the first metal layer 22 can be a material with suitable strength including aluminum, such as aluminum.
  • the material of the fourth layer 23 can be any suitable material that is in contact with the external environment, such as, but not limited to, nylon.
  • the electrode assembly 10 includes pole pieces and a first layer 11 .
  • the pole piece includes a positive pole piece 12 and a negative pole piece 13 , and the first layer 11 is disposed between the positive pole piece 12 and the negative pole piece 13 .
  • the positive electrode sheet 12 , the first layer 11 and the negative electrode sheet 13 are stacked along the third direction Z and then wound around the second direction Y to form the electrode assembly 10 , and the winding center of the electrode assembly 10 is M.
  • the third direction Z refers to the direction perpendicular to one surface of the first adapter sheet 136 or the second adapter sheet 126, and is also the stacking direction of the positive electrode sheet 12, the first layer 11 and the negative electrode sheet 13;
  • the second direction Y refers to the direction in which the first adapter piece 136 or the second adapter piece 126 extends out of the housing, and the second direction Y is perpendicular to the third direction Z.
  • the pole pieces include alternately stacked multi-layer negative pole pieces 13 and multi-layer positive pole pieces 12, wherein the outermost layer of the pole piece is a layer of negative pole piece 13, and the outer surface of the pole piece is The surface of one layer of negative electrode sheet 13.
  • the first layer 11 is located at the outermost layer of the electrode assembly 10, so as to isolate the negative electrode sheet 13 and the housing 20 located at the outermost layer of the electrode sheet, and lower the negative electrode sheet 13.
  • the risk of contact with the casing 20 can be protected, and the negative electrode sheet 13 located on the outermost layer of the electrode sheet can be protected from being exposed to the electrolyte, so as to reduce the risk of the electrolyte corroding the negative electrode sheet 13 .
  • the positive electrode tab 12 may be located at the outermost layer of the electrode assembly 10 .
  • the edge of the negative electrode sheet 13 exceeds the edge of the positive electrode sheet to reduce the risk of lithium deposition.
  • the electrode assembly 10 includes a plurality of first planar parts 101 and a plurality of second planar parts 103 located on opposite sides of the winding center M in the third direction Z, and a plurality of second planar parts 103 located on opposite sides of the winding center M in the first direction X.
  • Both the first planar portion 101 and the second planar portion 103 are connected to the first curved portion 102 and the second curved portion 104 .
  • the first direction X is perpendicular to the second direction Y and the third direction Z.
  • the electrode assembly 10 also includes a first surface 105 and a second surface 106 oppositely disposed in the third direction Z.
  • the first surface 105 is composed of the surface of the outermost first planar portion 101 located on the upper side of the winding center M, the surface of the outermost first curved portion 102 located on the upper side of the winding center M, and the surface of the outermost first curved portion 102 located on the upper side of the winding center M.
  • the surface of the outermost second curved portion 104 is composed of the surface of the outermost first planar portion 101 located on the lower side of the winding center M, the outermost first planar portion 101 located on the lower side of the winding center M
  • the surface of the curved portion 102 and the surface of the outermost second curved portion 104 located below the winding center M are configured.
  • the first boundary line 11A between the first planar portion 101 and the first curved portion 102 located on the outermost side of the electrode assembly 10 is located on the innermost side of the electrode assembly 10 and on the side of the winding center M in the first direction X.
  • the bent edge (the left side in FIG. 3 ) extends in the third direction Z where the dotted line AA intersects with the first surface 105 .
  • the second boundary line 11B between the second flat portion 103 on the outermost side of the electrode assembly 10 and the first curved portion 102 is located on the innermost side of the electrode assembly 10 and on the side of the winding center M in the first direction X.
  • the bent edge (the left side in FIG. 3 ) extends in the third direction Z where the dotted line AA intersects with the second surface 106 .
  • the third boundary line 11C between the first planar portion 101 and the second curved portion 104 located on the outermost side of the electrode assembly 10 is located on the innermost side of the electrode assembly 10 and on the side of the winding center M in the first direction X.
  • the bent edge (the right side in FIG.
  • the fourth boundary line 11D between the outermost second flat portion 103 and the second curved portion 104 of the electrode assembly 10 is located on the innermost side of the electrode assembly 10 and on the side of the winding center M in the first direction X.
  • the bent edge (the right side in FIG. 3 ) extends in the third direction Z where the dotted line BB intersects with the second surface 106 .
  • the fourth boundary lines 11D between the two bent portions 102 are respectively located at four corners of the electrode assembly 10 .
  • An angular position B-B of the electrode assembly 10 is shown in FIG. 3 . Referring to FIG. 1 and FIG. 3 , the corner B-B of the electrode assembly 10 is opposite to the corner A-A of the casing 20 .
  • the first layer 11 includes an opposite starting end 11a and an ending end 11b
  • the positive electrode sheet 12 includes an opposite starting end 12a and an ending end 12b
  • the negative electrode sheet 13 includes an opposing starting end 11a and an ending end 11b.
  • the winding direction W refers to the direction of winding around the second direction Y
  • the starting end refers to the position of the first layer 11, the positive electrode sheet 12 or the negative electrode sheet 13 in the winding direction W.
  • the end at the start position and the end end refer to the end of the first layer 11 , the positive pole piece 12 or the negative pole piece 13 at the winding end position in the winding direction W.
  • the ending end 11 b of the first layer 11 and the ending end 13 b of the negative pole piece 13 are located at the first bent portion 102
  • the ending end 12 b of the positive pole piece 12 is located at the first planar portion 101 .
  • the negative electrode sheet 13 includes a first side 13c extending along the first direction X and a second side 13d extending along the second direction Y.
  • the first side 13c and the second side 13d are connected by the third side 13e, and the first intersection A is formed by the intersection of the first side 13c and the third side 13e.
  • the second side 13d is also the ending end 13b of the negative pole piece 13
  • the third side 13e is located at the corner of the ending end 13b of the negative pole piece 13 .
  • the angle ⁇ between the third side 13e and the first side 13c and the angle ⁇ between the third side 13e and the second side 13d are both acute angles.
  • the third side 13e is a concave curve.
  • the housing 20 further includes a first wall 201 , a second wall 202 and a third wall 203 connected to each other.
  • the first wall 201 is perpendicular to the third direction Z
  • the second wall 202 is perpendicular to the second direction Y
  • the third wall 203 is perpendicular to the first direction X.
  • the first wall 201 and the second wall 202 are connected by the first arc wall 211
  • the first wall 201 and the third wall 203 are connected by the second arc wall 212
  • the second wall 202 and the third wall 203 are connected by The third arc walls 213 are connected.
  • the arc radius of the first arc wall 211 is R 1
  • the arc radius of the second arc wall 212 is R 2
  • the connection line L3 intersects at the second intersection point O.
  • the second intersection point O is the spherical center of the angular position AA of the housing 20 , which is located at a thinner position on the first metal layer 22 in the housing 20 .
  • the projection of the second intersection point O on the first surface 105 or the second surface 106 of the electrode assembly 10 where the part of the negative electrode sheet 13 with the first intersection point A is located is the third intersection point O′.
  • the part of the negative electrode sheet 13 with the first intersection point A refers to the part of the negative electrode sheet 13 from its end 13b to the first intersection point A, which can be located on the first surface 105 and/or the first intersection point A. on the two surfaces 106 .
  • the third intersection point O′ refers to the projection of the second intersection point O on the surface closer to the first intersection point A among the first surface 105 and the second surface 106 .
  • the distance L between the third intersection point O' and the first intersection point A satisfies the relationship L ⁇ 0.8(R 1 +R 2 ).
  • the extension line of the first side 13c and the extension line of the second side 13d intersect to form a virtual intersection point A′, and the virtual intersection point A′ is opposite to the corner position of the housing 20 .
  • the connection between the third side 13e and the first side 13c and the second side 13d can be kept away from the corner of the housing 20; and the distance between the third intersection O' and the first intersection A can be made L satisfies the relational expression L ⁇ 0.8(R 1 +R 2 ), which can reduce the risk of the negative pole piece 13 piercing the second layer 21 of the shell 20, thereby reducing the contact between the first metal layer 22 of the shell 20 and the electrolyte or the negative electrode.
  • a notch-like structure is formed at the corner position of the negative electrode sheet 13, and the notch-shaped structure can be used as a cutting mark in the process of using the negative electrode sheet coil to produce the negative electrode sheet, reducing the Risk of defective products (such as tab misalignment) caused by wrong cutting position.
  • the negative electrode sheet 13 includes a second metal layer 131 , a first conductive material layer 132 and a second conductive material layer 133 .
  • the second metal layer 131 includes a first surface 131a and a second surface 131b oppositely disposed.
  • the first conductive material layer 132 is continuously disposed on the first surface 131a
  • the second conductive material layer 133 is continuously disposed on the second surface 131b.
  • the conductive material can be continuously coated on the first surface 131a and the second surface 131b of the second metal layer 131, which improves the manufacturing efficiency.
  • Both the first conductive material layer 132 and the second conductive material layer 133 function as active layers, which can be selected from at least one of graphite-based materials, alloy-based materials, lithium metal and alloys thereof.
  • the graphite-based material can be selected from at least one of artificial graphite and natural graphite; the alloy-based material can be selected from at least one of silicon, silicon oxide, tin, and titanium sulfide.
  • the second metal layer 131 has the function of collecting current, which may include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, At least one of Si, Ge, Sb, Pb, In, Zn and combinations thereof.
  • the second metal layer 131 includes copper.
  • the positive pole piece 12 includes a third metal layer 121 , a third conductive material layer 122 and a fourth conductive material layer 123 .
  • the third metal layer 121 includes a third surface 121a and a fourth surface 121b oppositely disposed.
  • the third conductive material layer 122 is continuously disposed on the third surface 121a
  • the fourth conductive material layer 123 is continuously disposed on the fourth surface 121b.
  • the conductive material is continuously coated on the third surface 121 a and the fourth surface 121 b of the third metal layer 121 , which improves the manufacturing efficiency.
  • Both the third conductive material layer 122 and the fourth conductive material layer 123 have an active layer effect, which may include lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium iron phosphate, lithium manganese iron phosphate, phosphoric acid lithium At least one of lithium vanadium, lithium vanadyl phosphate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate and combinations thereof.
  • the third metal layer 121 has the function of current collection, which may include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, At least one of Si, Ge, Sb, Pb, In, Zn and combinations thereof.
  • the first layer 11 is used to prevent direct contact between the positive pole piece 12 and the negative pole piece 13 , thereby reducing the risk of contact short circuit between the first conductive layer 111 and the second conductive layer 112 .
  • the first layer 11 contains an insulating material.
  • the insulating material can be selected from at least one of polypropylene, polyethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polymethyl methacrylate or polyethylene glycol.
  • the first layer 11 may be a barrier film.
  • the material of the first layer 11 is polyethylene, and the thickness of the first layer 11 ranges from 14 ⁇ m to 25 ⁇ m. In some other embodiments, the material of the first layer 11 is polypropylene, and the thickness of the first layer 11 ranges from 5 ⁇ m to 12 ⁇ m. The thicker the first layer 11 is, the more it helps to improve corrosion, and the distance L between the third intersection O' and the first intersection A will have a weaker effect on corrosion.
  • the electrode assembly 10 further includes a third layer 30 .
  • the third layer 30 is connected to the first layer 11 and located at the first bending portion 102 .
  • the third layer 30 is used to connect the first layer 11 and the second layer of the case to fix the electrode assembly 10 on the case.
  • the third layer 30 includes an insulating material, and the insulating material may include at least one of acrylic, polyurethane, rubber, and silicone. In other embodiments, the third layer 30 may be located on the first planar portion 101 or the second curved portion 104 .
  • the surface of the first layer 11 is covered with a coating 40 .
  • the coating 40 can be an inorganic coating or an organic coating.
  • the inorganic coating includes inorganic particles and a binder.
  • the inorganic particles can be at least one of aluminum oxide, silicon dioxide, titanium dioxide, zirconium dioxide, cerium oxide, calcium oxide, calcium carbonate and barium titanate;
  • the binder can be styrene-butadiene polymerized polyvinylidene fluoride, polyvinylpyrrolidone, vinylidene fluoride-hexafluoropropylene polymer, polyacrylonitrile, sodium carboxymethyl cellulose, butadiene-acrylonitrile polymer, polyacrylic acid, polymethyl acrylate, poly At least one of ethyl acrylate and polyacrylic-styrene polymer.
  • Organic coatings can be polyvinylidene fluoride, polyvinylpyrrolidone, vinylidene fluoride-hexafluoropropylene polymer, polyacrylonitrile, sodium carboxymethyl cellulose, sodium polyacrylate, butadiene-acrylonitrile polymer, ethyl acetate At least one of ester, polyacrylic acid, polymethyl acrylate, polyethyl acrylate and polyacrylic acid-styrene polymer.
  • the coating 40 the safety performance and mechanical performance of the first layer 11 can be improved, which helps to improve corrosion.
  • the number of layers of the coating 40 on the surface of the first layer 11 is one or two.
  • the influence of the distance L between the third intersection point O' and the first intersection point A on corrosion becomes weaker.
  • the shell has a thickness in the range of 80 ⁇ m to 150 ⁇ m. The thicker the shell, the more it helps to improve the corrosion, and the distance L between the third intersection O' and the first intersection A will have a weaker effect on corrosion.
  • the negative pole piece 13 further includes a fourth side 13f and a fifth side 13g, the fourth side 13f is parallel to the first side 13c, and the fifth side 13g is parallel to the second side 13d.
  • the fifth side 13g is vertically connected to the first side 13c and the fourth side 13f, and the second side 13d is vertically connected to the fourth side 13f.
  • the fifth side 13g serves as the starting end 13a of the negative electrode sheet 13 .
  • the first side 13c may be vertically connected to the second side 13d
  • the second side 13d may be connected to the fourth side 13f through the third side 13e.
  • the first conductive material layer 132 is disposed on the first surface 131a of the second metal layer 131, and is continuously disposed from the starting end 13a to the ending end 13b in the fourth direction X'.
  • the second conductive material layer 133 is disposed on the second surface 131b of the second metal layer 131, and is continuously disposed from the starting end 13a to the ending end 13b in the fourth direction X'.
  • the fourth direction X' is perpendicular to the second direction Y and the third direction Z, which is the extension direction of the negative electrode sheet 13 before winding.
  • the negative pole piece 13 further includes a plurality of negative pole tabs 134 and a first adapter piece 136 .
  • a plurality of negative tabs 134 extend from one side of the second metal layer 131 and protrude from the first side 13 c of the negative tab 13 .
  • a plurality of negative tabs 134 are arranged at intervals.
  • a plurality of negative tabs 134 are bent inside the housing 20 to form a first tab set 135 .
  • the plurality of negative tabs 134 are formed by cutting the edge of the second metal layer 131 .
  • the first tab set 135 is connected to the first adapter piece 136 .
  • the first tab set 135 can be, but not limited to, connected to the first adapter piece 136 by welding. An end of the first adapter piece 136 away from the first tab set 135 protrudes out of the housing 20 to connect to external components.
  • the first adapter piece 136 may include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, At least one of Pb, In, Zn and combinations thereof.
  • the positive pole piece 12 includes a sixth side 12c and a seventh side 12d extending along the fourth direction X' parallel to each other, and an eighth side 12e and a seventh side extending along the second direction Y and parallel to each other.
  • the eighth side 12e serves as the ending end 12b of the positive pole piece 12
  • the ninth side 12f serves as the starting end 12a of the positive pole piece 12 .
  • the sixth side 12c is vertically connected to both the eighth side 12e and the ninth side 12f
  • the seventh side 12d is vertically connected to both the eighth side 12e and the ninth side 12f.
  • the third conductive material layer 122 is disposed on the third surface 121a of the third metal layer 121, and is continuously disposed in the fourth direction X' from the starting end 12a to the ending end 12b.
  • the fourth conductive material layer 123 is disposed on the fourth surface 121b of the third metal layer 121, and is continuously disposed from the starting end 12a to the ending end 12b in the fourth direction X'.
  • the positive pole piece 12 further includes a plurality of positive pole tabs 124 and a second adapter piece 126 .
  • a plurality of positive tabs 124 extend from one side of the third metal layer 121 and protrude from the sixth side 12c. In the fourth direction X', a plurality of positive tabs 124 are arranged at intervals.
  • a plurality of positive tabs 124 are bent inside the casing to form a second tab set 125 . In this embodiment, the plurality of positive tabs 124 are formed by cutting the edge of the third metal layer 121 .
  • the second tab set 125 is connected to the second adapter piece 126 .
  • the second adapter piece 126 can be connected with the second adapter piece 126 by but not limited to welding. An end of the second adapter piece 126 away from the second tab set 125 protrudes out of the housing 20 to connect to external components.
  • the second adapter piece 126 may include Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, At least one of Pb, In, Zn and combinations thereof.
  • the ending end 11 b of the first layer 11 , the ending end 13 b of the negative pole piece 13 and the ending end 12 b of the positive pole piece 12 are all located at the first bending portion 102 .
  • the ending end 11b of the first layer 11, the ending end 13b of the negative pole piece 13, and the ending end 12b of the positive pole piece 12 can be respectively located at the first bending portion 102 and the second bending portion 104, or both can be located at The second curved portion 104 .
  • the negative electrode sheet 13 includes two third sides 13e.
  • One of the third sides 13e connects the first side 13c and the second side 13d, and the other third side 13e connects the second side 13d and the fourth side 13f.
  • notch-like structures are formed at the two corners of the end end 13b of the negative pole piece 13 .
  • the negative electrode sheet 13 includes three third sides 13e.
  • One of the third sides 13e connects the first side 13c and the second side 13d, one third side 13e connects the second side 13d and the fourth side 13f, and the other third side 13e connects the first side 13c and the fifth side 13g.
  • a notch-like structure is formed at two corners of the ending end 13b of the negative pole piece 13 and one corner of the starting end 13a of the negative pole piece 13 .
  • the negative electrode sheet 13 includes four third sides 13e.
  • One of the third sides 13e connects the first side 13c and the second side 13d
  • one third side 13e connects the second side 13d and the fourth side 13f
  • one third side 13e connects the first side 13c and the fifth side 13g
  • the other A third side 13e connects the fifth side 13g and the fourth side 13f.
  • the third side 13e is a curve composed of a concave curve and a convex curve.
  • the connection between the third side 13e and the first side 13c is an arc transition, and the angle ⁇ between the third side 13e and the second side 13d is an acute angle.
  • the two third sides 13e respectively form two included angles (acute angles) between the first side 13c and the second side 13d, and between the fourth side 13f and the second side 13d.
  • the connection between the third side 13e and the second side 13d may be an arc transition, and the angle ⁇ between the connection between the third side 13e and the first side 13c may be an acute angle.
  • the third side 13e is a straight line.
  • the included angle ⁇ between the third side 13e and the first side 13c is an obtuse angle
  • the included angle ⁇ between the third side 13e and the second side 13d is an acute angle.
  • two third sides 13e are obtuse angles and two are acute angles.
  • the range of the obtuse angle is greater than 90° and less than or equal to 150°.
  • the third side 13e can be a straight line and a straight line or a line segment formed by a straight line and a curved line
  • the angle ⁇ between the third side 13e and the first side 13c can be an acute angle
  • the third side 13e and the second side The included angle ⁇ at the junction of the sides 13d can be an obtuse angle.
  • the third side 13e is an arc line
  • the connection between the third side 13e and the first side 13c and the connection between the third side 13e and the second side 13d are arc transitions.
  • the third side 13e and the first side 13c and the second side 13d are all arc-shaped transitions, even if the distance L between the third intersection point O' and the first intersection point A does not satisfy the relational expression L ⁇ 0.8 (R 1 +R 2 ), the corrosion situation can also be improved.
  • the first intersection A formed by the intersection of the first side 13 c and the third side 13 e is located on the first plane portion 101 .
  • the terminal end 13b of the negative pole piece 13 is located at the first bent portion 102
  • the third side 13e extends from the first bent portion 102 to the first planar portion 101.
  • both the terminal end 13 b of the negative pole piece 13 and the first intersection point A can be located at the first planar portion 101 .
  • the positive pole piece 12 further includes a tenth side 12g.
  • the sixth side 12c is connected to the seventh side 12d via the tenth side 12g.
  • the tenth side 12g includes at least one of a straight line and a curved line.
  • the positive pole piece 12 may include a plurality of tenth sides 12g, the sixth side 12c and the seventh side 12d may be connected to the eighth side 12e and the ninth side 12f through the tenth side 12g, Thus, notch-like structures are formed at each corner of the positive electrode sheet 12 .
  • the embodiment of the present application also provides an electronic device 200 , and the electronic device 200 includes a main body 220 and a battery 100 .
  • the battery 100 is accommodated in the main body 220 .
  • the electronic device 200 can be one of a mobile phone, a tablet, and an electronic reader.
  • the electronic device 200 is a mobile phone as an example.
  • the battery 100 is disposed in the mobile phone to provide power for the mobile phone.
  • the main body 220 is a mobile phone structure. It can be understood that, in other embodiments, the electronic device 200 may also have other structures, and is not limited to the above-mentioned mobile phone, tablet, and electronic reader.
  • the present application forms a notch-like structure by setting a third side at the corner position of the end end of the negative pole piece, so that the angle (obtuse angle or acute angle) at the end end of the negative pole piece is far away from the corner position of the housing; and the shell
  • An intersection point A satisfies the relationship L ⁇ 0.8(R 1 +R 2 ), which can reduce the risk of the negative pole piece piercing the second layer of the shell, thereby reducing the contact between the first metal layer of the shell and the negative pole piece or the electrolyte.
  • the notch-shaped structure formed at the corner position of the end end of the negative electrode sheet can be used as a cutting mark, which is helpful for identification and positioning during the cutting process, so as to facilitate the division of the negative electrode sheet coil into parts during production and manufacturing. Multiple negative electrodes for finished batteries.
  • the finished battery as shown in Figure 14 is obtained.
  • the difference between the battery 100 shown in FIG. 14 and the battery 100 shown in FIG. 4 is that the first side A directly intersects the first side 13 c and the second side 13 d.
  • the first side 13c and the fourth side are vertically connected to the second side 13d respectively, that is, two right angles are formed at two corner positions of the second side 13d.
  • the finished battery as shown in Figure 10 is obtained.
  • Corrosion test test the voltage difference between the first adapter piece and the first metal layer of the battery sample. When the voltage difference is greater than or equal to 0.6V, the probability of corrosion is high, and it is judged that the corrosion test fails; when the voltage difference is less than At 0.6V, it is determined that the corrosion test has passed.
  • X/1000 means that among the 1000 samples tested, the number of failed corrosion tests is X.

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Abstract

一种电池，包括极片和收容极片的壳体。极片包括位于最外层的负极极片，负极极片包括沿相互垂直方向延伸的第一边和第二边，第三边连接第一边和第二边，第一边与第三边相交形成第一交点。壳体包括相互连接的第一壁、第二壁和第三壁，第一壁和第二壁通过第一圆弧壁相连接，第一壁和第三壁通过第二圆弧壁相连接，第二壁和第三壁之间通过第三圆弧壁相连接，第一圆弧壁的圆弧半径为R 1，第二圆弧壁的圆弧半径为R 2，第一圆弧壁各处的中点连线、第二圆弧壁各处的中点连线以及第三圆弧壁各处的中点连线相交形成第二交点，第二交点在电极组件的第一表面的投影为第三交点，第三交点与第一交点之间的距离L满足关系式L≥0.8(R 1+R 2)。

Description

电池及包含其的电子装置 技术领域
本申请涉及储能装置领域，尤其是涉及一种电池及包括所述电池的电子装置。
背景技术
锂离子电池具有能量密度大、循环寿命长、标称电压高、自放电率低、体积小、重量轻等许多优点，在消费电子领域具有广泛的应用。随着近年来电动汽车和可移动电子设备的高速发展，人们对电池的能量密度、使用寿命、制造效率等相关需求越来越高，为此，电池的结构需要不断进行优化。
发明内容
本申请的一个目的在于提出一种电池，其可提高壳体的使用寿命。
本申请第一方面提供一种电池，包括电极组件和收容电极组件的壳体。电极组件包括极片和包含绝缘材料的第一层。极片包括正极极片和负极极片，第一层设置于正极极片和负极极片之间，负极极片位于极片的最外层，负极极片包括沿第一方向延伸的第一边以及沿第二方向延伸的第二边，第一方向与第二方向相垂直，第一边通过第三边与第二边相连接，第一边与第三边相交形成第一交点。壳体包括层叠设置的第一金属层和包含聚合物材料的第二层，第二层相对于第一金属层靠近电极组件设置。壳体还包括相互连接的第一壁、第二壁和第三壁，第一壁和第二壁通过第一圆弧壁相连接，第一壁和第三壁通过第二圆弧壁相连接，第二壁和第三壁之间通过第三圆弧壁相连接，第一圆弧壁的圆弧半径为R 1，第二圆弧壁的圆弧半径为R 2，第一圆弧壁各处的中点连线、第二圆弧壁各处的中点连线以及第三圆弧壁各处的中点连线相交形成第二交点。电极组件还包括在第三方向上相对设置的第一表面和第二表面，第三方向与第一方向和第二方向相垂直。第二交点在负极极片上设有第一交点的部分所在电极组件的第一表面或第二表面上的投影为第三交点，第三交点与第一交点之间的距离L满足关系式L≥0.8(R 1+R 2)。
本申请通过在负极极片的结束端的边角位置处设置第三边，形成缺口状结构，使得位于负极极片的结束端处的夹角远 离壳体的角位；且壳体的角位的球面中心在负极极片的结束端所在的电极组件的第一表面或第二表面上形成的投影(第三交点O’)与位于负极极片的结束端的边角处的第一交点A满足关系式L≥0.8(R 1+R 2)，可降低负极极片刺穿壳体的第二层的风险，从而降低壳体的第一金属层与负极极片或电解液相接触的风险，改善腐蚀情况，提高壳体的使用寿命。
根据本申请的一些实施例，第三边与第一边的连接处以及第三边与第二边的连接处均为弧形过渡连接。
根据本申请的一些实施例，第三边与第一边的连接处的夹角为钝角或锐角，第三边与第二边的连接处的夹角为钝角或锐角。
根据本申请的一些实施例，第三边与第一边的连接处以及第三边与第二边的连接处中的一者为弧形过渡连接，其另一者的夹角为钝角或锐角。
根据本申请的一些实施例，第三边包括曲线和直线中的至少一者。
根据本申请的一些实施例，负极极片、第一层和正极极片堆叠后卷绕形成电极组件，电极组件还包括在第三方向上相对设置的第一平面部和第二平面部以及连接于第一平面部和第二平面部之间且在第一方向上相对设置的第一弯曲部和第二弯曲部。
根据本申请的一些实施例，所负极极片的结束端位于第一弯曲部中，使得位于负极极片的结束端的边角位置的夹角可远离壳体的角位，从而可降低负极极片刺穿壳体的第二层的风险。
根据本申请的一些实施例，正极极片的结束端位于第一弯曲部。
根据本申请的一些实施例，第一层的结束端位于第一弯曲部。
根据本申请的一些实施例，第一交点位于第一平面部。
根据本申请的一些实施例，第一层位于电极组件的最外层，电极组件还包括包含绝缘材料的第三层，第三层与第一层相连接并位于第一弯曲部。通过设置第三层，可将电极组件牢固连接于壳体上。
根据本申请的一些实施例，第一层的表面覆盖有涂层。通过设置涂层，可提高第一层的安全性能和机械性能，有助于改善腐蚀。
根据本申请的一些实施例，负极极片包括第二金属层、第一导电材料层和第二导电材料层，第二金属层包括相对设置的 第一面和第二面，负极极片还包括在电极组件的卷绕方向上相对设置的起始端和结束端，第一导电材料层从负极极片的起始端到负极极片的结束端连续设置于第一面，第二导电材料层从负极极片的起始端到负极极片的结束端连续设置于第二面。
根据本申请的一些实施例，负极极片还包括自第二金属层的一侧延伸形成的多个负极极耳。
根据本申请的一些实施例，负极极片还包括第一转接片，多个负极极耳在壳体内弯折形成第一极耳组，第一极耳组与第一转接片相连接，第一转接片远离第一极耳组的一端伸出壳体外。
根据本申请的一些实施例，正极极片包括第三金属层、第三导电材料层和第四导电材料层，第三金属层包括相对设置的第三面和第四面，正极极片还包括在电极组件的卷绕方向上相对设置的起始端和结束端，第三导电材料层从正极极片的起始端到正极极片的结束端连续设置于第三面，第四导电材料层从正极极片的起始端到正极极片的结束端连续设置于第四面。
根据本申请的一些实施例，正极极片包括自第三金属层的一侧延伸形成的多个正极极耳。
根据本申请的一些实施例，正极极片还包括第二转接片，多个正极极耳在壳体内弯折形成第二极耳组，第二极耳组与第二转接片相连接，第二转接片远离第二极耳组的一端伸出壳体外。
根据本申请的一些实施例，壳体的厚度范围为80μm至150μm。
根据本申请的一些实施例，第一金属层包含铝，聚合物材料包括聚乙烯、聚丙烯、乙烯丙烯共聚物、聚乙烯改性材料或聚丙烯改性材料。
根据本申请的一些实施例，第二金属层包含铜。
本申请第二方面还提供一种电子装置，包括上述电池。
附图说明
本申请的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解，其中：
图1为本申请一实施例提供的电池的示意图；
图2为图1所示电池的壳体沿II-II的局部截面示意图；
图3为图1所示电池的电极组件沿III-III的截面示意图；
图4为图1所示电池的A-A部分的局部俯视图；
图5A为图3所示电极组件的负极极片的俯视图；
图5B为图3所示电极组件的负极极片的截面示意图；
图6为图1所示电池沿IV-IV的截面示意图；
图7A为图3所示电极组件的正极极片的俯视图；
图7B为图3所示电极组件的正极极片的截面示意图；
图8为图1所示电池沿VIII-VIII的截面示意图；
图9A为本申请另一实施例提供的电极组件的截面示意图，该截面示意图的截取方向与图1中的III-III的截取方向相同；
图9B为本申请另一实施例提供的电极组件的负极极片的俯视图；
图9C为本申请又一实施例提供的电极组件的负极极片的俯视图；
图9D为本申请又一实施例提供的电极组件的负极极片的俯视图；
图10为本申请另一实施例提供的电池的局部俯视图，该局部俯视图所示的部分在图10所表示的电池中所处的位置与图1中的A-A部分所处的位置相同；
图11为本申请又一实施例提供的电池的局部俯视图，该局部俯视图所示的部分在图11所表示的电池中所处的位置与图1中的A-A部分所处的位置相同；
图12A为本申请又一实施例提供的电池的局部俯视图，该局部俯视图所示的部分在图12A所表示的电池中所处的位置与图1中的A-A部分所处的位置相同；
图12B为本申请又一实施例提供的电池的局部俯视图，该局部俯视图所示的部分在图12B所表示的电池中所处的位置与图1中的A-A部分所处的位置相同；
图12C为本申请另一实施例提供的电极组件的正极极片的俯视图；
图13为本申请一实施例提供的电子装置的示意图；
图14为本申请对比例1提供的电池的局部俯视图，该局部俯视图所示的部分在图14所表示的电池中所处的位置与图1中的A-A部分所处的位置相同。
主要元件符号说明
电池                            100
电极组件                        10
壳体                            20
第二层                          21
第一金属层                      22
第四层                           23
第一层                           11
正极极片                         12
负极极片                         13
第一表面                         105
第二表面                         106
第一弯曲部                       102
第二弯曲部                       104
第一平面部                       101
第二平面部                       103
起始端                           11a、12a、13a
结束端                           11b、12b、13b
第一边                           13c
第二边                           13d
第三边                           13e
第四边                           13f
第五边                           13g
第一壁                           201
第二壁                           202
第三壁                           203
第一圆弧壁                       211
第二圆弧壁                       212
第三圆弧壁                       213
第二金属层                       131
第一导电材料层                   132
第二导电材料层                   133
第一面                           131a
第二面                           131b
第三金属层                       121
第三导电材料层                   122
第四导电材料层                   123
第三面                           121a
第四面                           121b
第三层                           30
涂层                             40
负极极耳                         134
第一转接片                       136
第一极耳组                       135
正极极耳                        124
第二转接片                      126
第二极耳组                      125
电子装置                        200
主体                            220
第一分界线                      11A
第二分界线                      11B
第三分界线                      11C
第四分界线                      11D
第六边                          12c
第七边                          12d
第八边                          12e
第九边                          12f
第十边                          12g
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。
请参阅1及图2，本申请一实施例提供一种电池100，包括电极组件10、电解液(图未示)以及收容电极组件10和电解液的壳体20。电极组件10的第一转接片136和第二转接片126从壳体20的一端伸出，以连接外部元件。壳体20可以包括依次层叠设置的第二层21、第一金属层22和第四层23。第二层21相对于第一金属层22靠近电极组件10设置。第四层23位于壳体20的最外侧，暴露于外界环境中。
第二层21的材料可为本领域中适于接触且容纳电极组件10的任何材料。在一些实施例中，第二层21包含聚合物材料，聚合物材料可为聚乙烯、聚丙烯、乙烯丙烯共聚物、聚乙烯改性材料或聚丙烯改性材料。第一金属层22包含铝。第一金属层22的材料可为铝等包含铝的具有合适强度的材料。第四层23的材料可为任意的合适与外部环境接触的材料，例如，但不限于尼龙。
请参阅图3，电极组件10包括极片和第一层11。极片包括正极极片12和负极极片13，第一层11设置于正极极片12和负极极片13之间。正极极片12、第一层11和负极极片13沿第三方向Z堆叠后绕第二方向Y卷绕形成电极组件10，电极组件10的卷绕中心为M。本申请中，第三方向Z指的垂直于第一转接片136或第二转接片126的一个表面的方向，也是正极极片12、第一层11和负极极片13的堆叠方向；第二方向Y指的是第一转接片136或第二转接片126延伸出壳体的方向，第二方向Y与第三方向Z相垂直。沿第三方向Z观察，极片包括 交替堆叠设置的多层负极极片13和多层正极极片12，其中，极片的最外层为一层负极极片13，极片的外表面为一层负极极片13的表面。在一些实施例中，沿第三方向Z观察，第一层11位于电极组件10的最外层，以隔离位于极片的最外层的负极极片13和壳体20，降低负极极片13与壳体20接触的风险，并能够保护位于极片的最外层的负极极片13使其不暴露在电解液中，以降低电解液腐蚀负极极片13的风险。在一些实施例中，沿第三方向Z观察，正极极片12可位于电极组件10的最外层。沿第二方向Y，负极极片13的边缘超出正极极片的边缘，以减少析锂的风险。
电极组件10包括在第三方向Z上位于卷绕中心M相对两侧的多个第一平面部101和多个第二平面部103以及在第一方向X上位于卷绕中心M相对两侧的多个第一弯曲部102和多个第二弯曲部104。第一平面部101及第二平面部103均与第一弯曲部102和第二弯曲部104相连接。本申请中，第一方向X与第二方向Y和第三方向Z相垂直。图3中，多个第一平面部101和多个第二平面部103分布于卷绕中心M的上下两侧，多个第一弯曲部102和多个第二弯曲部104分布于卷绕中心M的左右两侧。电极组件10还包括在第三方向Z上相对设置的第一表面105和第二表面106。第一表面105由位于卷绕中心M上侧的最外侧的第一平面部101的表面、位于卷绕中心M上侧的最外侧的第一弯曲部102的表面和位于卷绕中心M上侧的最外侧的第二弯曲部104的表面构成，第二表面106由位于卷绕中心M下侧的最外侧的第一平面部101的表面、位于卷绕中心M下侧的最外侧的第一弯曲部102的表面和位于卷绕中心M下侧的最外侧的第二弯曲部104的表面构成。位于电极组件10的最外侧的第一平面部101与第一弯曲部102之间的第一分界线11A为位于电极组件10的最内侧且位于卷绕中心M在第一方向X上的一侧(图3中的左侧)的弯折边在第三方向Z上延伸形成的虚线AA与第一表面105相交的部分。位于电极组件10的最外侧的第二平面部103与第一弯曲部102之间的第二分界线11B为位于电极组件10的最内侧且位于卷绕中心M在第一方向X上的一侧(图3中的左侧)的弯折边在第三方向Z上延伸形成的虚线AA与第二表面106相交的部分。位于电极组件10的最外侧的第一平面部101与第二弯曲部104之间的第三分界线11C为位于电极组件10的最内侧且位于卷绕中心M在第一方向X上的一侧(图3中的右侧)的弯折边在第三方向Z上延伸形成的虚线BB与第一表面105相交的部分。位于电极 组件10的最外侧的第二平面部103与第二弯曲部104之间的第四分界线11D为位于电极组件10的最内侧且位于卷绕中心M在第一方向X上的一侧(图3中的右侧)的弯折边在第三方向Z上延伸形成的虚线BB与第二表面106相交的部分。位于电极组件10的最外侧的第一平面部101与第一弯曲部102之间的第一分界线11A、位于电极组件10的最外侧的第二平面部103与第一弯曲部102之间的第二分界线11B、位于电极组件10的最外侧的第一平面部101与第二弯曲部104之间的第三分界线11C、以及位于电极组件10的最外侧的第二平面部103与第二弯曲部102之间的第四分界线11D分别位于电极组件10的四个角位处。图3中示出了电极组件10的一个角位B-B。请参阅图1和图3，电极组件10的角位B-B与壳体20的角位A-A相对。
在电极组件10的卷绕方向W上，第一层11包括相对设置的起始端11a和结束端11b，正极极片12包括相对设置的起始端12a和结束端12b，负极极片13包括相对设置的起始端13a和结束端13b。本申请中，卷绕方向W指的是绕第二方向Y进行卷绕的方向，起始端指的是第一层11、正极极片12或负极极片13在卷绕方向W上位于卷绕开始位置处的一端，结束端指的是第一层11、正极极片12或负极极片13在卷绕方向W上位于卷绕结束位置处的一端。本实施例中，第一层11的结束端11b及负极极片13的结束端13b位于第一弯曲部102，正极极片12的结束端12b位于第一平面部101。通过将负极极片13的结束端13b设置于第一弯曲部102，使得负极极片13的结束端13b的边角可离开壳体20的角位A-A，可降低负极极片13的结束端13b的边角刺穿壳体的第二层的风险，从而降低壳体20的第一金属层22与电解液或负极极片13相接触的风险，降低第一金属层22与电解液发生反应腐蚀的风险，或降低第一金属层22与负极极片13接触后因电位不同而在电解液的浸润下发生腐蚀的风险，进而提高壳体20的使用寿命。
请参阅图4，图4中，第一层被省略，负极极片13位于电极组件10的最外层。负极极片13包括沿第一方向X延伸的第一边13c以及沿第二方向Y延伸的第二边13d。第一边13c和第二边13d通过第三边13e相连接，第一边13c与第三边13e相交形成第一交点A。其中，第二边13d同时为负极极片13的结束端13b，第三边13e位于负极极片13的结束端13b的边角位置处。第三边13e与第一边13c的连接处的夹角α以及第三边13e与第二边13d的连接处的夹角β均为锐角。本实施例 中，第三边13e为内凹曲线。
请参阅图1和图4，壳体20还包括相互连接的第一壁201、第二壁202和第三壁203。第一壁201与第三方向Z相垂直，第二壁202与第二方向Y相垂直，第三壁203与第一方向X相垂直。第一壁201和第二壁202之间通过第一圆弧壁211相连接，第一壁201和第三壁203通过第二圆弧壁212相连接，第二壁202和第三壁203通过第三圆弧壁213相连接。第一圆弧壁211的圆弧半径为R 1，第二圆弧壁212的圆弧半径为R 2。第一圆弧壁211上各圆弧边的中点连线L1、第二圆弧壁212上各圆弧边的中点连线L2与第三圆弧壁213上各圆弧边的中点连线L3相交于第二交点O。第二交点O为壳体20的角位A-A的球面中心，其位于壳体20中的第一金属层22上较薄的位置处。第二交点O在负极极片13设有第一交点A的部分所在的电极组件10的第一表面105或第二表面106上的投影为第三交点O’。本一些实施例中，负极极片13设有第一交点A的部分指的是负极极片13上自其结束端13b至第一交点A的部分，其可位于第一表面105及/或第二表面106上。在一些实施例中，第三交点O’指第二交点O在第一表面105和第二表面106中更靠近所述第一交点A的表面上的投影。第三交点O’与第一交点A之间的距离L满足关系式L≥0.8(R 1+R 2)。
第一边13c的延长线和第二边13d的延长线相交形成虚拟交点A’，虚拟交点A’与壳体20的角位相对。通过设置第三边13e，可使第三边13e与第一边13c和第二边13d的连接处远离壳体20的角位；且使第三交点O’与第一交点A之间的距离L满足关系式L≥0.8(R 1+R 2)，可降低负极极片13刺穿壳体20的第二层21的风险，从而降低壳体20的第一金属层22与电解液或负极极片13相接触的风险，降低第一金属层22与电解液发生反应腐蚀的风险，或降低第一金属层22与负极极片13接触后因电位不同而在电解液的浸润下发生腐蚀的风险，进而提高壳体20的使用寿命。另外，通过设置第三边13e，在负极极片13的边角位置形成缺口状结构，该缺口状结构可在利用负极极片卷料生产负极极片的过程中用作裁切标记，降低因裁切位置错误而导致的产品不良(例如极耳错位)的风险。
请参阅图3，负极极片13包括第二金属层131、第一导电材料层132和第二导电材料层133。第二金属层131包括相对设置的第一面131a和第二面131b。沿卷绕方向W，第一导电材料层132连续设置于第一面131a，第二导电材料层133连续设置于第二面131b。制造时，导电材料可连续涂布于第二金属 层131的第一面131a和第二面131b，提高了制造效率。第一导电材料层132和第二导电材料层133均具有活性层作用，其可选自石墨类材料、合金类材料、锂金属及其合金中的至少一种。石墨类材料可选自人造石墨、天然石墨中的至少一种；合金类材料可选自硅、氧化硅、锡、硫化钛中的至少一种。第二金属层131具有集流的功能，其可包括Ni、Ti、Cu、Ag、Au、Pt、Fe、Co、Cr、W、Mo、Al、Mg、K、Na、Ca、Sr、Ba、Si、Ge、Sb、Pb、In、Zn及其组合物中的至少一种。本实施例中，第二金属层131包括铜。
正极极片12包括第三金属层121、第三导电材料层122和第四导电材料层123。第三金属层121包括相对设置的第三面121a和第四面121b。沿卷绕方向W，第三导电材料层122连续设置于第三面121a，第四导电材料层123连续设置于第四面121b。制造时，导电材料连续涂布于，导电材料可连续涂布于第三金属层121的第三面121a和第四面121b，提高了制造效率。第三导电材料层122和第四导电材料层123均具有活性层作用，其可包括钴酸锂、锰酸锂、镍酸锂、镍钴锰酸锂、磷酸铁锂、磷酸锰铁锂、磷酸钒锂、磷酸钒氧锂、富锂锰基材料、镍钴铝酸锂及其组合物中的至少一种。第三金属层121具有集流的功能，其可包括Ni、Ti、Cu、Ag、Au、Pt、Fe、Co、Cr、W、Mo、Al、Mg、K、Na、Ca、Sr、Ba、Si、Ge、Sb、Pb、In、Zn及其组合物中的至少一种。
第一层11用于防止正极极片12和负极极片13直接接触，从而降低第一导电层111和第二导电层112发生接触短路的风险。第一层11包含绝缘材料。绝缘材料可选自聚丙烯、聚乙烯、聚偏二氟乙烯、偏二氟乙烯-六氟丙烯共聚物、聚甲基丙烯酸甲酯或聚乙二醇中至少一种。第一层11可以是隔离膜。
在一些实施例中，第一层11的材质为聚乙烯，第一层11的厚度范围为14μm至25μm。在另一些实施例中，第一层11的材质为聚丙烯，第一层11的厚度范围为5μm至12μm。第一层11的厚度越厚，越有助于改善腐蚀，第三交点O’与第一交点A之间的距离L对腐蚀的影响会变弱。
在一些实施例中，电极组件10还包括第三层30。第三层30与第一层11连接，并位于第一弯曲部102。第三层30用于连接第一层11和壳体的第二层，以将电极组件10固定于壳体上。第三层30包括绝缘材料，绝缘材料可包括丙烯酸酯、聚氨酯、橡胶及硅胶中的至少一种。在其他实施例中，第三层30可位于第一平面部101或第二弯曲部104。
在一些实施例中，第一层11的表面覆盖有涂层40。涂层40可为无机物涂层或有机物涂层。无机物涂层包括无机物颗粒和粘接剂。无机颗粒可为三氧化二铝、二氧化硅、二氧化钛、二氧化锆、二氧化铈、氧化钙、碳酸钙和钛酸钡中的至少一种；粘接剂可为苯乙烯-丁二烯聚合物、聚偏氟乙烯、聚乙烯吡咯烷酮、偏氟乙烯-六氟丙烯聚合物、聚丙烯腈、羧甲基纤维素钠、丁二烯-丙烯腈聚合物、聚丙烯酸、聚丙烯酸甲酯、聚丙烯酸乙酯和聚丙烯酸-苯乙烯聚合物中的至少一种。有机物涂层可为聚偏氟乙烯、聚乙烯吡咯烷酮、偏氟乙烯-六氟丙烯聚合物、聚丙烯腈、羧甲基纤维素钠、聚丙烯酸钠、丁二烯-丙烯腈聚合物、乙酸乙酯、聚丙烯酸、聚丙烯酸甲酯、聚丙烯酸乙酯和聚丙烯酸-苯乙烯聚合物中的至少一种。通过设置涂层40，可提高第一层11的安全性能和机械性能，有助于改善腐蚀。
在一些实施例中，第一层11的表面的涂层40的层数为一层或两层。当涂层40的层数较多时，第三交点O’与第一交点A之间的距离L对腐蚀的影响变弱。
在一些实施例中，壳体的厚度范围为80μm至150μm。壳体越厚，越有助于改善腐蚀，第三交点O’与第一交点A之间的距离L对腐蚀的影响会变弱。
请参阅图5A和图5B，负极极片13还包括第四边13f和第五边13g，第四边13f与第一边13c平行，第五边13g与第二边13d平行。第五边13g与第一边13c和第四边13f均垂直连接，第二边13d与第四边13f垂直连接。第五边13g作为负极极片13的起始端13a。在其他实施方式中，第一边13c可与第二边13d垂直连接，第二边13d可通过第三边13e与第四边13f连接。第一导电材料层132设置于第二金属层131的第一面131a上，并在第四方向X’上从起始端13a连续设置到结束端13b。第二导电材料层133设置于第二金属层131的第二面131b上,并在第四方向X’上从起始端13a连续设置到结束端13b。本申请中，第四方向X’与第二方向Y和第三方向Z相垂直，其为卷绕前的负极极片13的延伸方向。
请参阅图5A、图5B和图6，负极极片13还包括多个负极极耳134和第一转接片136。多个负极极耳134自第二金属层131的一侧延伸形成并自负极极片13的第一边13c突出。在第四方向X’上，多个负极极耳134间隔设置。多个负极极耳134在壳体20内弯折形成第一极耳组135。本实施例中，多个负极极耳134通过裁切第二金属层131的边缘形成。第一极耳组135与第一转接片136相连接。第一极耳组135可以但不限于通过 焊接与第一转接片136相连接。第一转接片136远离第一极耳组135的一端伸出壳体20外，以连接外部元件。第一转接片136可包括Ni、Ti、Cu、Ag、Au、Pt、Fe、Co、Cr、W、Mo、Al、Mg、K、Na、Ca、Sr、Ba、Si、Ge、Sb、Pb、In、Zn及其组合物中的至少一种。
请参阅图7A和图7B，正极极片12包括沿第四方向X’延伸且相互平行的第六边12c和第七边12d以及沿第二方向Y延伸且相互平行的第八边12e和第九边12f。第八边12e作为正极极片12的结束端12b，第九边12f作为正极极片12的起始端12a。第六边12c与第八边12e和第九边12f均垂直连接，第七边12d与第八边12e和第九边12f均垂直连接。第三导电材料层122设置于第三金属层121的第三面121a上，并在第四方向X’上从起始端12a连续设置到结束端12b。第四导电材料层123设置于第三金属层121的第四面121b上，并在第四方向X’上从起始端12a连续设置到结束端12b。
请参阅图7A、图7B和图8，正极极片12还包括多个正极极耳124和第二转接片126。多个正极极耳124自第三金属层121的一侧延伸形成并自所述第六边12c突出。在第四方向X’上，多个正极极耳124间隔设置。多个正极极耳124在壳体内弯折形成第二极耳组125。本实施例中，多个正极极耳124通过裁切第三金属层121的边缘形成。第二极耳组125与第二转接片126相连接。第二转接片126可以但不限于通过焊接与第二转接片126相连接。第二转接片126远离第二极耳组125的一端伸出壳体20外，以连接外部元件。第二转接片126可包括Ni、Ti、Cu、Ag、Au、Pt、Fe、Co、Cr、W、Mo、Al、Mg、K、Na、Ca、Sr、Ba、Si、Ge、Sb、Pb、In、Zn及其组合物中的至少一种。
请参阅图9A，在一些实施例中，第一层11的结束端11b、负极极片13的结束端13b以及正极极片12的结束端12b均位于第一弯曲部102。在其他实施例中，第一层11的结束端11b、负极极片13的结束端13b以及正极极片12的结束端12b可分别位于第一弯曲部102和第二弯曲部104，或者均位于第二弯曲部104。
请参阅图9B，在一些实施例中，负极极片13包括两个第三边13e。其中一个第三边13e连接第一边13c和第二边13d，另一个第三边13e连接第二边13d和第四边13f。通过设置两个第三边13e，在负极极片13的结束端13b的两个边角位置处均形成缺口状结构。
请参阅图9C，在一些实施例中，负极极片13包括三个第三边13e。其中一个第三边13e连接第一边13c和第二边13d，一个第三边13e连接第二边13d和第四边13f，另一个第三边13e连接第一边13c和第五边13g。通过设置三个第三边13e，在负极极片13的结束端13b的两个边角位置处以及负极极片13的起始端13a的一个边角位置处均形成缺口状结构。
请参阅图9D，在一些实施例中，负极极片13包括四个第三边13e。其中一个第三边13e连接第一边13c和第二边13d，一个第三边13e连接第二边13d和第四边13f，一个第三边13e连接第一边13c和第五边13g，另一个第三边13e连接第五边13g和第四边13f。通过设置四个第三边13e，在负极极片13的结束端13b的两个边角位置处以及负极极片13的起始端13a的两个边角位置处均形成缺口状结构。
请参阅图10，在一些实施例中，第三边13e为由内凹曲线和外凸曲线构成的曲线。第三边13e与第一边13c的连接处为弧形过渡，第三边13e与第二边13d的连接处的夹角β为锐角。两个第三边13e分别在第一边13c和第二边13d之间、在第四边13f和第二边13d之间形成两个夹角(锐角)。在其他实施例中，第三边13e与第二边13d的连接处可为弧形过渡，第三边13e与第一边13c的连接处的夹角α可为锐角。
请参阅图11，在一些实施例中，第三边13e为直线。第三边13e与第一边13c的连接处的夹角α为钝角，第三边13e与第二边13d的连接处的夹角β均为锐角。两个第三边13e分别在第一边13c和第二边13d之间、在第四边13f和第二边13d之间形成的四个夹角中两个为钝角，两个为锐角。在一些实施例中，该钝角的范围为大于90°且小于或等于150°。在其他实施例中，第三边13e可为直线和直线或直线和曲线构成的线段，第三边13e与第一边13c的连接处的夹角α可为锐角，第三边13e与第二边13d的连接处的夹角β均可为钝角。
请参阅图12A，在一些实施例中，第三边13e为圆弧线，第三边13e与第一边13c的连接处以及第三边13e与第二边13d的连接处均为弧形过渡。当第三边13e与第一边13c和第二边13d之间均为弧形过渡时，即使第三交点O’与第一交点A之间的距离L不满足关系式L≥0.8(R 1+R 2)，腐蚀情况也能够得到改善。
请参阅图12B，在一些实施例中，第一边13c与第三边13e相交形成的第一交点A位于第一平面部101。具体的，负极极片13的结束端13b位于第一弯曲部102，第三边13e自第一弯 曲部102延伸至第一平面部101。在其他实施例中，负极极片13的结束端13b以及第一交点A均可位于第一平面部101。
请参阅图12C，在一些实施例中，正极极片12还包括第十边12g。第六边12c通过第十边12g与第七边12d相连接。第十边12g包括直线和曲线中的至少一种。通过设置第十边12g在正极极片12的边角位置处形成缺口状结构，该缺口状结构可作为正极极片的生产过程中用作裁切标记。在其他实施方式中，正极极片12可包括多个第十边12g，第六边12c和第七边12d各自与第八边12e和第九边12f之间可通过第十边12g相连接，从而在正极极片12的各个边角位置处形成缺口状结构。
请参阅图13，本申请的实施例还提供一种电子装置200，电子装置200包括主体220和电池100。电池100收容于主体220内。电子装置200可为手机、平板、电子阅读器中的一种。
本申请中电子装置200以手机为例，电池100设置于手机内，以向手机提供电量供手机使用，主体220为手机结构。可以理解的是，在其他实施例中，电子装置200还可为其他结构，不限于上述的为手机、平板、电子阅读器。
本申请通过在负极极片的结束端的边角位置处设置第三边，形成缺口状结构，使得位于负极极片的结束端处的夹角(钝角或锐角)远离壳体的角位；且壳体的角位的球面中心在负极极片的结束端所在的电极组件的第一表面或第二表面上形成的投影(第三交点O’)与位于负极极片的结束端的边角处的第一交点A满足关系式L≥0.8(R 1+R 2)，可降低负极极片刺穿壳体的第二层的风险，从而降低壳体的第一金属层与负极极片或电解液相接触的风险，改善腐蚀情况，提高壳体的使用寿命。另外，负极极片的结束端的边角位置处形成的缺口状结构可作为裁切标记，有助于在裁切过程中进行识别定位，以方便在生产制造中将负极极片卷料分割为用于成品电池的多个负极极片。
以下通过具体实施例和对比例对本申请提供的电池的性能进行说明。
实施例1
将电极组件装入壳体，经注液、封装、化成后得到如图10所示的成品电池。其中，第三交点O’与第一交点A之间的距离L满足关系式L＝0.8(R 1+R 2)。
实施例2
将电极组件装入壳体，经注液、封装、化成后得到如图10所示的成品电池。其中，第三交点O’与第一交点A之间的距离L满足关系式L＝1.0(R 1+R 2)。
实施例3
将电极组件装入壳体，经注液、封装、化成后得到如图11所示的成品电池。其中，第三交点O’与第一交点A之间的距离L满足关系式L＝1.0(R1+R2)。
对比例1
将电极组件装入壳体，经注液、封装、化成后得到如图14所示的成品电池。图14所示的电池100与图4所示的电池100的区别在于，第一边13c与第二边13d直接相交形成第一交点A。第一边13c和第四边分别与第二边13d垂直连接，即在第二边13d的两个边角位置处形成两个直角。第三交点O’与第一交点A之间的距离L满足关系式L＝0.4(R 1+R 2)。
对比例2
将电极组件装入壳体，经注液、封装、化成后得到如图10所示的成品电池。其中，第三交点O’与第一交点A之间的距离L满足关系式L＝0.6(R 1+R 2)。
对比例3
将电极组件装入壳体，经注液、封装、化成后得到如图11所示的成品电池。其中，第三交点O’与第一交点A之间的距离L满足关系式L＝0.6(R 1+R 2)。
每组实施例和对比例的电池各取1000个样品进行腐蚀测试。测试结果如表1所示。
腐蚀测试：测试电池样品的第一转接片和第一金属层之间的电压差，当电压差大于或等于0.6V时，出现腐蚀的概率较高，判定腐蚀测试不通过；当电压差小于0.6V时，判定腐蚀测试通过。
表1
  夹角个数 关系式 腐蚀情况
实施例1 2 L＝0.8(R 1+R 2) 0/1000
实施例2 2 L＝1.0(R 1+R 2) 0/1000
实施例3 4 L＝1.0(R 1+R 2) 0/1000
对比例1 2 L＝0.4(R 1+R 2) 150/1000
对比例2 2 L＝0.6(R 1+R 2) 60/1000
对比例3 4 L＝0.6(R 1+R 2) 90/1000
注：X/1000表示测试1000个样品中腐蚀测试不通过的个数为X个。
从表1测试结果可知，对比实施例1-3和对比例1-3，通过设置第三边，并使第三交点O’与第一交点A满足关系式 L≥0.8(R 1+R 2)，可改善腐蚀情况。
以上所揭露的仅为本申请较佳实施方式而已，当然不能以此来限定本申请，因此依本申请所作的等同变化，仍属本申请所涵盖的范围。

Claims (23)

  1. 一种电池，其特征在于，包括：
    电极组件，包括极片和包含绝缘材料的第一层，其中，所述极片包括正极极片和负极极片，所述第一层设置于所述正极极片和所述负极极片之间，所述负极极片位于所述极片的最外层，所述负极极片包括沿第一方向延伸的第一边以及沿第二方向延伸的第二边，所述第一方向与所述第二方向相垂直，所述第一边通过第三边与所述第二边相连接，所述第一边与所述第三边相交形成第一交点；以及
    壳体，收容所述电极组件，其中，所述壳体包括层叠设置的第一金属层和包含聚合物材料的第二层，所述第二层相对于所述第一金属层靠近所述电极组件设置；
    其中，所述壳体还包括相互连接的第一壁、第二壁和第三壁，所述第一壁和所述第二壁通过第一圆弧壁相连接，所述第一壁和所述第三壁通过第二圆弧壁相连接，所述第二壁和所述第三壁之间通过第三圆弧壁相连接，所述第一圆弧壁的圆弧半径为R 1，所述第二圆弧壁的圆弧半径为R 2，所述第一圆弧壁的中点连线、所述第二圆弧壁的中点连线以及所述第三圆弧壁的中点连线相交形成第二交点，所述电极组件还包括在第三方向上相对设置的第一表面和第二表面，所述第三方向与所述第一方向和所述第二方向相垂直，所述第二交点在所述负极极片上设有所述第一交点的部分所在所述电极组件的所述第一表面或所述第二表面上的投影为第三交点，所述第三交点与所述第一交点之间的距离L满足关系式L≥0.8(R 1+R 2)。
  2. 如权利要求1所述的电池，其特征在于，所述第三边与所述第一边的连接处以及所述第三边与所述第二边的连接处均为弧形过渡连接。
  3. 如权利要求1所述的电池，其特征在于，所述第三边与所述第一边的连接处的夹角为钝角或锐角，所述第三边与所述第二边的连接处的夹角为钝角或锐角。
  4. 如权利要求1所述的电池，其特征在于，所述第三边与所述第一边的连接处以及所述第三边与所述第二边的连接处中的一者为弧形过渡连接，其另一者的夹角为钝角或锐角。
  5. 如权利要求1所述的电池，其特征在于，所述第三边包括曲线和直线中的至少一者。
  6. 如权利要求1所述的电池，其特征在于，所述负极极片、所述第一层和所述正极极片堆叠后卷绕形成所述电极组件，所述电极组件还包括在第三方向上相对设置的第一平面部和第二 平面部以及连接于所述第一平面部和所述第二平面部之间且在所述第一方向上相对设置的第一弯曲部和第二弯曲部。
  7. 如权利要求6所述的电池，其特征在于，在卷绕方向上，所述第二边为结束端。
  8. 如权利要求6所述的电池，其特征在于，所述负极极片的结束端位于第一弯曲部。
  9. 如权利要求6所述的电池，其特征在于，所述正极极片的结束端位于第一弯曲部。
  10. 如权利要求6所述的电池，其特征在于，所述第一层的结束端位于第一弯曲部。
  11. 如权利要求6所述的电池，其特征在于，所述第一交点位于第一平面部。
  12. 如权利要求6所述的电池，其特征在于，所述第一层位于所述电极组件的最外层，所述电极组件还包括包含绝缘材料的第三层，所述第三层与所述第一层相连接并位于第一弯曲部。
  13. 如权利要求11所述的电池，其特征在于，所述第一层的表面覆盖有涂层。
  14. 如权利要求1所述的电池，其特征在于，所述负极极片包括第二金属层、第一导电材料层和第二导电材料层，所述第二金属层包括相对设置的第一面和第二面，所述负极极片还包括在所述电极组件的卷绕方向上相对设置的起始端和结束端，所述第一导电材料层从所述负极极片的起始端到所述负极极片的结束端连续设置于所述第一面，所述第二导电材料层从所述负极极片的起始端到所述负极极片的结束端连续设置于所述第二面。
  15. 如权利要求14所述的电池，其特征在于，所述负极极片还包括自所述第二金属层的一侧延伸形成的多个负极极耳。
  16. 如权利要求15所述的电池，其特征在于，所述负极极片还包括第一转接片，所述多个负极极耳在所述壳体内弯折形成第一极耳组，所述第一极耳组与所述第一转接片相连接，所述第一转接片远离所述第一极耳组的一端伸出所述壳体外。
  17. 如权利要求14所述的电池，其特征在于，所述第二金属层包含铜。
  18. 如权利要求1所述的电池，其特征在于，所述正极极片包括第三金属层、第三导电材料层和第四导电材料层，所述第三金属层包括相对设置的第三面和第四面，所述正极极片还包括在所述电极组件的卷绕方向上相对设置的起始端和结束端，所述第三导电材料层从所述正极极片的起始端到所述正极极片 的结束端连续设置于所述第三面，所述第四导电材料层从所述正极极片的起始端到所述正极极片的结束端连续设置于所述第四面。
  19. 如权利要求18所述的电池，其特征在于，所述正极极片包括自所述第三金属层的一侧延伸形成的多个正极极耳。
  20. 如权利要求19所述的电池，其特征在于，所述正极极片还包括第二转接片，所述多个正极极耳在所述壳体内弯折形成第二极耳组，所述第二极耳组与所述第二转接片相连接，所述第二转接片远离所述第二极耳组的一端伸出所述壳体外。
  21. 如权利要求1所述的电池，其特征在于，所述壳体的厚度范围为80μm至150μm。
  22. 如权利要求1所述的电池，其特征在于，所述第一金属层包含铝，所述聚合物材料包括聚乙烯、聚丙烯、乙烯丙烯共聚物、聚乙烯改性材料或聚丙烯改性材料。
  23. 一种电子装置，其特征在于，包括如权利要求1至22中任一项所述的电池。
PCT/CN2021/141633 2021-12-27 2021-12-27 电池及包含其的电子装置 WO2023122881A1 (zh)

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