WO2023015518A1 - 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
WO2023015518A1
WO2023015518A1 PCT/CN2021/112219 CN2021112219W WO2023015518A1 WO 2023015518 A1 WO2023015518 A1 WO 2023015518A1 CN 2021112219 W CN2021112219 W CN 2021112219W WO 2023015518 A1 WO2023015518 A1 WO 2023015518A1
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WO
WIPO (PCT)
Prior art keywords
layer
battery according
electrode assembly
lithium
region
Prior art date
Application number
PCT/CN2021/112219
Other languages
English (en)
French (fr)
Inventor
董宇洋
闫东阳
曾巧
Original Assignee
宁德新能源科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德新能源科技有限公司 filed Critical 宁德新能源科技有限公司
Priority to CN202180010258.8A priority Critical patent/CN115023856A/zh
Priority to PCT/CN2021/112219 priority patent/WO2023015518A1/zh
Publication of WO2023015518A1 publication Critical patent/WO2023015518A1/zh
Priority to US18/437,277 priority patent/US20240178434A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/598—Guarantee labels
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4221—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells with battery type recognition
    • 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
    • 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
    • H01M50/105—Pouches or flexible bags
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/534—Electrode connections inside a battery casing characterised by the material of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the field of energy storage devices, in particular to a battery and an electronic device including the battery.
  • terminal equipment using electric energy as a functional means is developing in a mobile and portable direction. If the battery of the terminal device is abnormal during use, the user will go to the after-sales service of the terminal device to replace the battery. Both the user and the manufacturer need to find out the reason for the abnormality of the battery. Therefore, the battery has a unique identification code to facilitate troubleshooting and traceability. .
  • the identification code of the traditional battery is located on the packaging shell of the battery, but the battery may encounter collisions and frictions during use, which will cause the identification code to be unrecognizable.
  • An object of the present application is to provide a battery that can prevent the phenomenon that the identification part cannot be recognized due to external force.
  • Some embodiments of the present application provide a battery, including an electrode assembly, and the electrode assembly includes a stack and a second layer.
  • the stack part includes a first conductive layer, a second conductive layer, and a first layer including an insulating material disposed between the first conductive layer and the second conductive layer.
  • the stack is arranged in a rolled configuration and further includes a first surface and a first end.
  • the thickness direction of the electrode assembly is defined as a first direction, viewed along the first direction, the first surface has a first region located on the first side of the first end, and a second region located on the second side of the first end. area. In a second direction perpendicular to the first direction, the first side and the second side are located on opposite sides of the first end portion. In the winding direction of the stack, the second region is closer to the first end than the first region.
  • the second layer covers at least a part of the first end portion and is connected with the first area and the second area, and the second layer is provided with an identification
  • the identification part is arranged on the electrode assembly instead of the casing, which can reduce the risk of the identification part being indistinguishable due to external forces such as external impact and friction of the battery.
  • the second layer viewed along the first direction, includes a first portion overlapping the first region and a second portion overlapping the second region, and the identification portion is disposed on the second end in a manner away from the first end portion. At least one of the first part and the second part.
  • the identification part is disposed on the one with a larger area of the first part and the second part.
  • the marking part is arranged on the first part or the second part with a larger area of the second layer, and the one with a larger area is not easy to detach from the surface of the stack part under the action of an external force, thereby reducing the contamination caused by the detachment of the second layer from the electrode assembly. risk of deformation.
  • the identification part is disposed on the one with the smaller area of the first part and the second part.
  • the identification portion covers at least a part of the first end portion.
  • the stack viewed along the first direction, in the second direction, has a third end and a fourth end opposite to the third end; viewed along the first direction, the second layer Arranged from the third end to the fourth end.
  • the stacking portion viewed along the first direction, in a third direction perpendicular to the first direction and the second direction, the stacking portion has a fifth end portion and a sixth end portion located on the opposite side of the fifth end portion ; Viewed along the first direction, the second layer is arranged away from the fifth end and the sixth end.
  • the second layer in the third direction, has a seventh end on the side of the fifth end and an eighth end on the opposite side of the seventh end and on the side of the sixth end , in the third direction, the distance from the fifth end to the seventh end is shorter than the distance from the sixth end to the eighth end.
  • the electrode assembly further includes a first metal plate, the first metal plate is connected to the first conductive layer, and viewed along the first direction, the first metal plate has an overlapping portion with the fifth end.
  • the distance from the first end to the third end is longer than the distance from the first end to the fourth end.
  • the stacking part further includes a first curved part, a second curved part located on the opposite side of the first curved part in the second direction, and a second curved part located at the first curved part and the second curved part when viewed along the first direction.
  • the first surface portion between the two portions and the second surface portion located between the first curved portion and the second curved portion and facing the opposite side of the first surface portion when viewed along the first direction.
  • the second layer is in continuous contact with the first surface portion, the first curved portion and the second curved portion. Extending the second layer from the first surface portion to the first curved portion and the second curved portion can improve the adhesion between the second layer and the stacked portion.
  • the second layer is in continuous contact with the first surface portion, the first curved portion, the second curved portion, and the second surface portion.
  • the marking part in the winding direction of the stacking part, is arranged away from the first bending part and the second bending part, so that the marking part can be displayed more clearly.
  • the stacking portion viewed along the first direction, has a third end portion in the second direction and a fourth end portion on the opposite side of the third end portion, and the stacking portion has a third end portion opposite to the third end portion.
  • the third direction perpendicular to the direction has a fifth end and a sixth end on the opposite side of the fifth end.
  • the electrode assembly viewed along the first direction, includes a third layer comprising an insulating material, the third layer is connected to the first surface and has an overlapping portion with the sixth end, and in the third direction, The third floor is set away from the second floor.
  • the third layer is in continuous contact with the first surface portion and the second surface portion.
  • the third layer is in continuous contact with the first surface part and the second surface part, and can compress the stack part in the first direction, reducing the risk of displacement of the first conductive layer, the second conductive layer or the first layer.
  • the third layer has a ninth end in the third direction and a tenth end located on the opposite side of the ninth end
  • the second layer has a seventh end in the third direction and a tenth end located in the seventh end.
  • the distance from the eighth end to the ninth end is different from the distance from the ninth end to the tenth end.
  • the distance from the eighth end to the ninth end is shorter than the distance from the ninth end to the tenth end.
  • the first conductive layer includes a first current collector and a first active material layer.
  • the first current collector includes Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si , Ge, Sb, Pb, In, Zn and their composition at least one, the first active material layer includes lithium cobaltate, lithium manganate, lithium nickelate, lithium nickel cobalt manganate, lithium iron phosphate, manganese phosphate At least one of lithium iron, lithium vanadium phosphate, lithium vanadyl phosphate, lithium-rich manganese-based materials, lithium nickel cobalt aluminate, lithium titanate, and combinations thereof.
  • the electrode assembly further includes a second metal plate, the second metal plate is welded to the outermost second conductive layer in the winding structure formed by winding the stacking part, the second metal plate and the second Soldering marks are formed between the conductive layers, and the stacked portion further includes a second surface opposite to the first surface, the second surface is provided with a fourth layer, and when viewed from the first direction, the fourth layer covers the soldering marks.
  • the fourth layer separates the welding mark and the shell, and suppresses the phenomenon that the weld mark burr pierces the shell.
  • the battery further includes a case accommodating the electrode assembly.
  • At least a portion of the surface of the inner side of the casing facing the electrode assembly has a conductive material.
  • An embodiment of the present application also provides an electronic device, including any battery described above.
  • Fig. 1 is a side view of a battery provided by an embodiment of the present application
  • Fig. 2 is a side view of the electrode assembly of the battery shown in Fig. 1;
  • Fig. 3 is a schematic front view of the battery shown in Fig. 1;
  • FIG. 4 is a schematic front view of the electrode assembly shown in FIG. 2;
  • Figure 5 is a schematic view of the back of the electrode assembly shown in Figure 2;
  • Fig. 6 is a sectional view along V-V of the electrode assembly shown in Fig. 2;
  • Fig. 7 is a left view of the electrode assembly shown in Fig. 2;
  • Figure 8 is a right view of the electrode assembly shown in Figure 2;
  • FIG. 9 is a schematic front view of an electrode assembly according to another embodiment of the present application.
  • FIG. 10 is a schematic front view of an electrode assembly according to another embodiment of the present application.
  • FIG. 11 is a schematic front view of an electrode assembly according to another embodiment of the present application.
  • FIG. 12 is a schematic front view of an electrode assembly according to another embodiment of the present application.
  • FIG. 13 is a schematic front view of an electrode assembly according to another embodiment of the present application.
  • FIG. 14 is a schematic front view of an electrode assembly according to another embodiment of the present application.
  • FIG. 15 is a schematic diagram of the reverse side of an electrode assembly according to another embodiment of the present application.
  • FIG. 16 is a schematic view of the reverse side of an electrode assembly according to another embodiment of the present application.
  • Fig. 17 is a side view of an electrode assembly according to another embodiment of the present application.
  • Figure 18 is a schematic front view of the electrode assembly shown in Figure 17;
  • Figure 19 is a schematic view of the reverse side of the electrode assembly shown in Figure 17;
  • Fig. 20 is a schematic cross-sectional view after the first conductive layer of the electrode assembly shown in Fig. 6 is expanded;
  • Fig. 21a is a schematic cross-sectional view after the second conductive layer of the electrode assembly shown in Fig. 6 is expanded;
  • Fig. 21b is a bottom view after the second conductive layer of the electrode assembly shown in Fig. 6 is expanded;
  • Fig. 22 is a schematic diagram of the reverse side of an electrode assembly according to another embodiment of the present application.
  • FIG. 23 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • the second layer 12 is the first layer 12
  • the third layer 17 is the third layer 17
  • the second active material layer 112b is the second active material layer 112b
  • the third side 41a is the third side 41a
  • the X direction refers to the thickness direction of the stacked portion.
  • the Y direction refers to a direction extending from the second region of the first surface to the first region perpendicular to the X direction.
  • the Z direction refers to the extending direction of the first metal plate itself perpendicular to the X direction.
  • an embodiment of the present application provides a battery 100 , including an electrode assembly 10 and a casing 20 for accommodating the electrode assembly 10 .
  • the first metal plate 101 and the second metal plate 102 of the electrode assembly 10 protrude from one end of the case 20 to connect external elements.
  • at least a portion of the inner surface of the case 20 facing the electrode assembly 10 may have a conductive material to improve the mechanical strength of the case 20 .
  • the casing 20 may be a metal casing, such as a steel casing or an aluminum casing.
  • the casing 20 may also be a packaging bag obtained by packaging with a packaging film, that is, the battery 100 is a pouch battery.
  • the electrode assembly 10 includes a stacked part 11 and a second layer 12 .
  • the stack part 11 includes a first conductive layer 111 , a second conductive layer 112 and a first layer 113 disposed between the first conductive layer 111 and the second conductive layer 112 .
  • the first layer 113 is used to prevent direct contact between the first conductive layer 111 and the second conductive layer 112 , thereby reducing the risk of contact short circuit between the first conductive layer 111 and the second conductive layer 112 .
  • the first layer 113 comprises an insulating material selected from at least one of polypropylene, polyethylene, polyvinylidene fluoride, vinylidene fluoride-hexafluoropropylene copolymer, polymethyl methacrylate or polyethylene glycol. kind.
  • the stack portion 11 is arranged in a rolled configuration.
  • the stacking part 11 includes a first surface 110, a first end 11a, a second end 11b (see FIG. 5).
  • the second layer 12 is connected to the first surface 110 .
  • the first end portion 11 a is an end portion of the first conductive layer 111 , the second conductive layer 112 or the first layer 113 located on the outermost side of the winding structure exposed to the outside of the winding structure when viewed along the winding direction.
  • the second conductive layer 112 is located at the outermost side of the winding structure, that is, the first end 11 a is the end of the second conductive layer 112 exposed outside the winding structure when viewed along the winding direction.
  • the second conductive layer 112 is a negative electrode
  • the first conductive layer 111 is a positive electrode.
  • the first surface 110 has a first region 110a located on the first side Y1 of the first end portion 11a in the Y direction and a second region 110a of the first end portion 11a opposite to the first side Y1 in the Y direction.
  • the second area 110b on both sides Y2.
  • the second region 110b is closer to the first end portion 11a than the first region 110a.
  • the second layer 12 is sheet-like, covers at least a part of the first end portion 11a and is connected to the first region 110a and the second region 110b.
  • the surface of the second layer 12 includes a first portion 121 overlapping the first region 110a and a second portion 122 overlapping the second region 110b when viewed along the X direction.
  • One of the first part 121 and the second part 122 with a larger area is provided with a marking part 30 , and the marking part 30 is set away from the first end part 11a.
  • the area of the second part 122 is larger than that of the first part 121 , and the identification part 30 is provided on the second part 122 in a manner of being separated from the first end part 11 a.
  • the area of the first part 121 is larger than that of the second part 122 , and the identification part 30 is provided on the first part 121 in a manner of being away from the first end part 11 a.
  • the larger one of the first portion 121 and the second portion 122 has stronger adhesion to the first surface 110 , and the larger one has a lower probability of detachment under the action of an external force. Disposing the marking portion 30 on the one with the larger area can reduce the risk of fouling and deformation caused by the second layer 12 detaching from the first surface 110 .
  • the identification part 30 is disposed on the one of the first part 121 and the second part 122 with a smaller area away from the first end part 11a. Referring to FIG. 11 , the area of the first portion 121 is smaller than the area of the second portion 122 , and the identification portion 30 is disposed on the first portion 121 away from the first end portion 11 a. Referring to FIG. 13 , the area of the second portion 122 is smaller than that of the first portion 121 , and the identification portion 30 is disposed on the second portion 122 away from the first end portion 11 a. In other embodiments, please refer to FIG. 12 , the identification part 30 is provided on the first part 121 and the second part 122, and covers at least a part of the first end part 11a.
  • the second layer 12 comprises insulating material, the insulating material is selected from at least one of polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin or polyurethane .
  • the identification part 30 is a combination of one or more of patterns, letters, numbers, characters, one-dimensional barcodes, two-dimensional codes, three-dimensional codes, entry labels and electronic labels.
  • the identification part 30 is used to express identification information.
  • the identification information expressed by the identification part 30 may include at least one of battery type and/or model, manufacturer and/or wholesaler, batch number, production date or service life.
  • the identification part 30 can be formed by one or more methods of printing, surface treatment, and pasting.
  • the stacked portion 11 has a third end portion 11c and a fourth end portion 11d on the opposite side of the third end portion 11c in the Y direction, and the second layer 12 is from the third end portion 11c to the fourth end portion 11d configuration.
  • the first conductive layer 111 has a fifth end portion 11 e in the Z direction and a sixth end portion 11 f on the opposite side of the fifth end portion 11 e when viewed in the X direction.
  • the first layer 113 has a first side 113a in the Z direction and is located at the first The second side (not shown) opposite to the side 113a, the first side 113a and the second side extend beyond the fifth end portion 11e and the sixth end portion 11f respectively.
  • the second layer 12 is arranged away from the fifth end portion 11 e and the sixth end portion 11 f.
  • the second layer 12 has a seventh end portion 12a on the side of the fifth end portion 11e and an eighth end portion 12b on the opposite side of the seventh end portion 12a and on the side of the sixth end portion 11f.
  • the distance D1 from the fifth end portion 11 e to the seventh end portion 12 a is shorter than the distance D2 from the sixth end portion 11 f to the eighth end portion 12 b.
  • the distance D3 from the first end portion 11a to the third end portion 11c is longer than the distance D4 from the first end portion 11a to the fourth end portion 11d.
  • the first metal plate 101 is connected to the first conductive layer 111 and passes through one end of the housing 20 to connect to external elements.
  • the second metal plate 102 is connected to the second conductive layer 112 and passes out from the same end of the casing 20 as opposed to the first metal plate 101 to connect to external elements. Both the first metal plate 101 and the second metal plate 102 have overlapping portions with the fifth end portion 11e when viewed along the X direction.
  • the stacking portion 11 also has a first curved portion 115, a second curved portion 116 located on the opposite side of the first curved portion 115 in the Y direction, and a second curved portion 116 located at the first curved portion 115 and the second curved portion when viewed along the X direction.
  • the junction of the outermost first curved portion 115 of the stacked portion 11 arranged in a rolled structure and the outermost first surface portion 117 of the stacked portion 11 is the first end 11A.
  • the first end 11A is the ending part of the curve on the second side Y2 in FIG. 6 in the winding direction, and the first end 11A is also the innermost part of the electrode assembly 10 and the bending edge on the second side Y2 in the X direction.
  • the junction of the second curved portion 116 located at the outermost side of the stacking portion 11 and the first surface portion 117 located at the outermost side of the stacking portion 11 is the second end 11B.
  • the second end 11B is the starting part of the curve located on the first side Y1 in FIG.
  • the junction of the outermost first curved portion 115 of the stacking portion 11 and the outermost second surface portion 118 of the stacking portion 11 is the third end 11C.
  • the third end 11C is the starting part of the curve located on the second side Y2 in FIG.
  • the junction of the outermost second curved portion 116 of the stacking portion 11 and the outermost second surface portion 118 of the stacking portion 11 is 11D.
  • the fourth end 11D is the ending part of the curve located on the first side Y1 in FIG.
  • the first end 11A is aligned with the third end 11C
  • the second end 11B is aligned with the fourth end 11D.
  • the second layer 12 is in continuous contact with the first surface portion 117 , the first curved portion 115 and the second curved portion 116 .
  • the first surface portion 117 overlaps with the first surface 110
  • the first surface 110 and the first curved portion 115 have a first overlapping area 14a
  • the first surface 110 and the second curved portion 116 There is a second overlapping region 14b.
  • the second layer 12 covers at least a part of any one of the first surface portion 117, the first overlapping region 14a, and the second overlapping region 14b.
  • the marking part 30 is arranged away from the first end 11A and the second end 11B, that is, the marking part is arranged away from the first bending part 115 and the second bending part 116 in the winding direction, In order to make the identification part 30 display more clearly.
  • the second layer 12 is configured from the first end 11A and covers a part of the first curved portion 115 .
  • the second layer 12 when viewed along the Y direction, can be configured from the first end 11A to the third end 11C, or the second layer 12 is not connected to the first bending portion 115 .
  • the second layer 12 viewed along the Y direction, in the X direction, is disposed from the second end 11B and covers a part of the second curved portion 116 .
  • the second layer 12 when viewed along the Y direction, can be configured from the second end 11B to the fourth end 11D, or the second layer 12 is not connected to the second bending portion 116 .
  • the second layer 12 covers a part of the first surface 110 along the Y direction.
  • the second layer 12 has an eleventh end portion 12c on the side of the third end portion 11c in the Y direction and a first end portion 12c on the opposite side of the eleventh end portion 12c and on the side of the fourth end portion 11d.
  • the twelfth end portion 12d, the eleventh end portion 12c is located away from the third end portion 11c, and the twelfth end portion 12d is located away from the fourth end portion 11d.
  • one of the eleventh end portion 12c and the twelfth end portion 12d may be disposed away from the corresponding third end portion 11c or fourth end portion 11d, and the other may be arranged with The respective third end portions 11c or fourth end portions 11d meet.
  • the distance D5 between the eleventh end portion 12c and the third end portion 11c is equal to the distance D6 between the twelfth end portion 12d and the fourth end portion 11d, and the eleventh end portion 12c and the fourth end portion 11d are equal.
  • Twelve end portions 12d are disposed away from the first end 11A and the second end 11B, respectively.
  • the second layer 12 has an overlapping portion with the sixth end portion 11f.
  • the eighth end 12b overlaps the sixth end 11f.
  • the second layer 12 is arranged from the sixth end portion 11f in the Z direction, and is provided away from the fifth end portion 11de.
  • the second layer 12 is also connected to the second surface portion 118 .
  • the second surface portion 118 overlaps the second surface 120
  • the second surface 120 and the first curved portion 115 have a third overlapping area 14c
  • the second surface 120 and the second curved portion 116 have a fourth overlapping area 14d.
  • the second layer 12 also covers a part of the third overlapping region 14c and the second surface portion 118 in the Y direction.
  • the second layer 12 also covers the third overlapping region 14 c , the second surface portion 118 and the fourth overlapping region 14 d in the Y direction.
  • the electrode assembly 10 further includes a third layer 17 .
  • the third layer 17 is in the form of a sheet.
  • the third layer 17 is connected to the first surface 110, is disposed away from the second layer 12, has an overlapping portion with the sixth end portion 11f, and has an overlapping portion with the first end portion 11a.
  • the first end portion 11a is further secured, and the risk of deformation caused by the second region 110b detaching from the first region 110a can be reduced.
  • the third layer 17 has a ninth end portion 17 a and a tenth end portion 17 b on the opposite side of the ninth end portion 17 a in the Z direction.
  • the distance D7 from the eighth end portion 12b to the ninth end portion 17a is different from the distance D8 from the ninth end portion 17a to the tenth end portion 17b. In some embodiments, the distance D7 from the eighth end 12b to the ninth end 17a is shorter than the distance D8 from the ninth end 17a to the tenth end 17b.
  • the third layer 17 comprises an insulating material selected from at least one of polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin and polyurethane .
  • the third layer 17 is continuous with the first surface portion 117 and the second surface portion 118 .
  • the third layer 17 is in continuous contact with the first surface part 117 and the second surface part 118, so that the stack part 11 is pressed against the X direction, and the first conductive layer, the second conductive layer or the first conductive layer of the stack part 11 can be reduced. Risk of deformation due to displacement of layers.
  • the first conductive layer 111 includes a first current collector 111 a and a first active material layer 111 b.
  • the first current collector 111a includes a first surface 31a and a second surface 31b oppositely disposed. Both the first surface 31a and the second surface 31b include a region provided with the first active material layer 111b and a region away from the first active material layer 111b.
  • the first current collector 111a includes Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, At least one of In, Zn and combinations thereof.
  • the first active material layer 111b includes lithium cobalt oxide, lithium manganese oxide, lithium nickel oxide, lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium manganese iron phosphate, lithium vanadium phosphate, lithium vanadium oxyphosphate, lithium-rich manganese-based materials, nickel At least one of lithium cobalt aluminum oxide and its composition.
  • Areas of the first surface 31 a and the second surface 31 b away from the first active material layer 111 b are provided with fifth layers 18 , and each fifth layer 18 is connected to the first active material layer 111 b.
  • the fifth layer 18 covers the junction of the first active material layer 11b and the first conductive layer 111, which can prevent direct contact between the first conductive layer 111 and the second conductive layer 112 caused by the detachment of the first active material layer 11b, and prevent short circuit .
  • the first metal plate 101 is welded to the area where the second surface 31b is away from the first active material layer 111b.
  • a first solder mark (not shown) is formed between the first metal plate 101 and the second surface 31b.
  • the fifth layer 18 includes an insulating material, which is at least one selected from polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin or polyurethane.
  • the second conductive layer 112 includes a second current collector 112 a and a second active material layer 112 b.
  • the second current collector 112a includes a third surface 41a and a fourth surface 41b oppositely disposed. Both the third surface 41a and the fourth surface 41b include a region where the second active material layer 112b is provided and a region away from the second active material layer 112b.
  • One end of the second current collector 112a is the first end 11a, and the second region 110b is closer to the first end than the first region 110a when viewed along the winding direction of the stack (winding along the Y direction). 11a.
  • the second current collector 112a includes Ni, Ti, Cu, Ag, Au, Pt, Fe, Co, Cr, W, Mo, Al, Mg, K, Na, Ca, Sr, Ba, Si, Ge, Sb, Pb, At least one of In, Zn and combinations thereof.
  • the second active material layer 112b may 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 plate 102 is welded to the area where the third surface 41a is separated from the first active material layer 111b.
  • the fourth layer 19 includes an insulating material, which is at least one selected from polyethylene, polypropylene, phenolic resin, melamine resin, unsaturated polyester resin, epoxy resin, silicone resin or polyurethane.
  • a second solder mark 105 is formed between the second metal plate 102 and the third surface 41 a.
  • the second metal plate 102 is connected to the second conductive layer 112 located on the outermost side of the winding structure formed by the stacked part 11 , so that the soldering burr of the second soldering mark 105 may penetrate the shell.
  • One of the fourth layers 19 is disposed on the second surface 120 . Viewed along the X direction, the fourth layer 19 covers the second solder mark 105 to separate the second solder mark 105 from the casing, reducing problems caused by solder print burrs. Please refer to FIG.
  • the fourth layer 19 covers the second surface portion 118 in the Y direction, and covers a part of the second surface portion 118 in the Z direction, and the fourth layer 19 leaves The third layer 17 is provided.
  • the embodiment of the present application further provides an electronic device 200 , and the electronic device 200 includes a display screen 210 , a main body 220 and a battery 100 .
  • the display screen 210 is installed on the main body 220 , and the battery 100 is accommodated in the main body 220 .
  • the identification portion 30 of the battery 100 can be observed.
  • the identification part 30 is set facing a part of the area on the main body 220 opposite to the display screen 210.
  • 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 marking part 30 is provided on the second layer 12 On the first part 121 or the second part 122 with a larger area, the one with a larger area is less likely to detach from the surface of the stacking part 11 under the action of an external force, thereby reducing the risk of fouling and deformation caused by detachment of the second layer 12 .
  • the electrode assembly 10 as shown in FIG. 11 is used, put into the casing, and the finished battery is obtained after liquid injection, packaging and formation.
  • the identification part 30 is located on the first part 121 with a smaller area.
  • the electrode assembly 10 shown in FIG. 13 is used, put into a casing, and a finished battery is obtained after liquid injection, packaging, and formation.
  • the identification part 30 is located on the second part 122 with a smaller area.
  • the electrode assembly 10 as shown in Fig. 12 is used, put into the casing, and the finished battery is obtained after liquid injection, packaging and formation.
  • the marking part 30 covers a part of the first end part 11a.
  • the electrode assembly 10 as shown in FIG. 10 is used, put into the casing, and the finished battery is obtained after liquid injection, packaging, and formation.
  • the identification part 30 is located on the first part 121 with a larger area.
  • the electrode assembly 10 as shown in FIG. 4 is used, put into the casing 20 (see FIG. 3 ), and the finished battery is obtained after liquid injection, packaging, and formation.
  • the identification part 30 is located on the second part 122 with a larger area.
  • Example 5 Prepare the same electrode assembly 10 as in Example 5, put it into a casing, and obtain a finished battery after liquid injection, packaging, and formation. The difference is that the identification part 30 is located on the outer surface of the casing.
  • the marking part 30 provided on the outer surface of the housing may have the same or similar structure as the marking part provided in Embodiments 1 to 5, and may be provided by the same or similar method, and may be used for recording information.
  • Drop test put the battery sample into the jig, and perform 10 drop tests at a height of 1.8m. Count the amount of defacement on the marking part, and the judgment standard for defacement is: observe the marking part after the test, if it is unrecognizable, it is considered as defaced.
  • Cycle test charge the battery sample at 0.2C constant current to 4.45V, constant voltage charge to 0.05C, and then discharge at 0.2C to 3V. This charge-discharge cycle flow was repeated 1000 times. Count the number of deformation of the marking part. The judgment standard of deformation is: select a direction of the plane where the marking part is located, and compare the size of the marking part in this direction before and after the cycle test. If the growth rate of the size after the cycle test is ⁇ 3%, it is considered to be deformed. .
  • X/20 means that among the 20 samples tested, the number of marked parts that are stained or deformed is X.
  • the marking part is arranged on the outer surface of the casing, and the probability of the marking part being stained in the drop test is relatively large; while the marking part is arranged on the electrode inside the casing The surface of the component and the identification part are less likely to be fouled.
  • the marking part is arranged on the larger one of the overlapping parts of the second layer and the first region or the second region, and in the charging and discharging cycle process of the battery, it can have a smaller The deformation probability of the logo part.

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  • Secondary Cells (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

本申请公开了一种电池，包括电极组件。电极组件包括堆叠部和第二层。堆叠部包括第一导电层、第二导电层和配置于第一导电层和第二导电层之间的第一层。堆叠部设置为卷绕结构且还包括第一表面和第一端部，第二层与堆叠部的第一表面相连接。定义电极组件的厚度方向为第一方向，沿第一方向观察，第一表面具有位于第一端部的第一侧的第一区域以及位于第一端部的第二侧的第二区域。在与第一方向相垂直的第二方向上，第一侧和第二侧位于第一端部的相对的两侧。沿堆叠部的卷绕方向观察，第二区域比第一区域更接近第一端部。第二层覆盖第一端部的至少一部分并与第一区域和第二区域相连接。第二层设有标识部。

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
当前以电能为功能手段的终端设备正往可移动、可携带的方向发展。如果终端设备的电池在使用过程中出现异常，用户会到终端设备的售后处更换电池，用户及厂商都有找到电池出现异常的原因的需求，因此电池有唯一的标识码可以便于问题排查及追溯。传统电池的标识码位于电池的包装壳体上，但电池在使用过程中可能发生碰撞摩擦等现象，由此会造成标识码无法辨认的问题。
发明内容
本申请的一个目的在于提出一种电池，其可抑制因外力导致标识部无法辨认的现象发生。
本申请一些实施例提供一种电池，包括电极组件，电极组件包括堆叠部和第二层。堆叠部包括第一导电层、第二导电层和配置于第一导电层和第二导电层之间包含绝缘材料的第一层。堆叠部设置为卷绕结构且还包括第一表面和第一端部。定义所述电极组件的厚度方向为第一方向，沿第一方向观察，第一表面具有位于第一端部的第一侧的第一区域，以及位于第一端部的第二侧的第二区域。在与第一方向相垂直的第二方向上，第一侧和第二侧位于第一端部的相对的两侧。在堆叠部的卷绕方向上，第二区域比第一区域更接近第一端部。第二层覆盖第一端部的至少一部分并与第一区域和第二区域相连接，第二层设有标识部。
本申请将标识部设置在电极组件上而非壳体上，可降低因电池外部撞击摩擦等外力导致标识部无法辨别的风险。
根据本申请的一些实施例，沿第一方向观察，第二层包括与第一区域重叠的第一部分和与第二区域重叠的第二部分，标识部以离开第一端部的方式设置于第一部分和第二部分中至少一者上。
根据本申请的一些实施例，标识部设置于第一部分和第二部分中面积较大的一者。将标识部设置第二层的面积较大的第一部分或第二部分上，面积较大的一者在外力作用下不易脱离堆叠部的表面，从而降低因第二层脱离电极组件而导致的污损变形的风险。
根据本申请的一些实施例，标识部设置于第一部分和第二部分中面积较小的一者。
根据本申请的一些实施例，沿第一方向观察，标识部覆盖第一端部的至少一部分。
根据本申请的一些实施例，沿第一方向观察，在第二方向上，堆叠部具有第三端部和位于第三端部对侧的第四端部；沿第一方向观察，第二层自第三端部至第四端部配置。通过将第二层自第三端部至第四端部配置，增大了第二层和第一表面的接触面积，提高了第二层与第一表面的粘接力。
根据本申请的一些实施例，沿第一方向观察，在与第一方向和第二方向相垂直的第三方向上，堆叠部具有第五端部和位于第五端部对侧的第六端部；沿第一方向观察，第二层以离开第五端部和第六端部的方式设置。
根据本申请的一些实施例，在第三方向上，第二层具有位于第五端部一侧的第七端部和位于第七端部对侧且位于第六端部一侧的第八端部，在第三方向上，第五端部至第七端部的距离比第六端部至第八端部的距离短。
根据本申请的一些实施例，电极组件还包括第一金属板，第一金属 板与第一导电层相连接，沿第一方向观察，第一金属板与第五端部具有重叠的部分。
根据本申请的一些实施例，沿第二方向，第一端部至第三端部的距离比第一端部至第四端部的距离长。
根据本申请的一些实施例，堆叠部还具备第一弯曲部、在第二方向上位于第一弯曲部对侧的第二弯曲部、沿第一方向观察时位于第一弯曲部和第二弯曲部之间的第一表面部以及沿第一方向观察时位于第一弯曲部和第二弯曲部之间且面向第一表面部的反面的第二表面部。
根据本申请的一些实施例，第二层与第一表面部、第一弯曲部以及第二弯曲部连续相接。将第二层自第一表面部延伸到第一弯曲部和第二弯曲部，可提高第二层与堆叠部的粘接力。
根据本申请的一些实施例，第二层与第一表面部、第一弯曲部、第二弯曲部以及第二表面部连续相接。
根据本申请的一些实施例，在堆叠部的卷绕方向上，标识部以离开第一弯曲部和第二弯曲部的方式设置，以使标识部显示得更清楚。
根据本申请的一些实施例，沿第一方向观察，堆叠部在第二方向上具有第三端部以及位于第三端部对侧的第四端部，堆叠部在与第一方向和第二方向相垂直的第三方向上具有第五端部和位于第五端部对侧的第六端部。
根据本申请的一些实施例，沿第一方向观察，电极组件包括包含绝缘材料的第三层，第三层与第一表面相连接并与第六端部具有重叠的部分，在第三方向上，第三层以离开第二层的方式设置。
根据本申请的一些实施例，第三层与第一表面部和第二表面部连续相接。第三层与第一表面部和第二表面部连续相接，可在第一方向上压紧堆叠部，降低第一导电层、第二导电层或第一层发生移位的风险。
根据本申请的一些实施例，第三层在第三方向上具备第九端部和位于第九端部对侧的第十端部，第二层在第三方向上具有第七端部和位于第七端部对侧且位于第十端部一侧的第八端部，在第三方向上，第八端部到第九端部的距离与第九端部到第十端部的距离不同。
根据本申请的一些实施例，第八端部到第九端部的距离比第九端部到第十端部的距离短。
根据本申请的一些实施例，第一导电层包括第一集流体和第一活性物质层。
根据本申请的一些实施例，第一集流体包括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，第一活性物质层包括钴酸锂、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、钛酸锂及其组合物中的至少一种。
根据本申请的一些实施例，电极组件还包括第二金属板，第二金属板焊接于在堆叠部卷绕形成的卷绕结构中位于最外侧的第二导电层，第二金属板与第二导电层之间形成有焊印，堆叠部还包括位于第一表面对侧的第二表面，第二表面设置有第四层，在从第一方向观察时，第四层覆盖焊印。第四层隔开焊印和壳体，抑制焊印毛刺刺穿壳体的现象发生。
根据本申请的一些实施例，电池还包括容纳电极组件的壳体。
根据本申请的一些实施例，壳体内侧面向电极组件的表面的至少一部分具有导电材料。
本申请一实施例还提供一种电子装置，包括上述任一种电池。
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侧视图；
图2为图1所示的电池的电极组件的侧视图；
图3为图1所示电池的正面示意图；
图4为图2所示的电极组件的正面示意图；
图5为图2所示的电极组件的背面示意图；
图6为图2所示的电极组件沿V-V的剖视图；
图7为图2所示的电极组件的左视图；
图8为图2所示的电极组件的右视图；
图9为本申请另一实施例的电极组件的正面示意图；
图10为本申请另一实施例的电极组件的正面示意图；
图11为本申请另一实施例的电极组件的正面示意图；
图12为本申请另一实施例的电极组件的正面示意图；
图13为本申请另一实施例的电极组件的正面示意图；
图14为本申请另一实施例的电极组件的正面示意图；
图15为本申请另一实施例的电极组件的反面示意图；
图16为本申请另一实施例的电极组件的反面示意图；
图17为本申请另一实施例的电极组件的侧视图；
图18为图17所示电极组件的正面示意图；
图19为图17所示电极组件的反面示意图；
图20为图6所示电极组件的第一导电层展开后的截面示意图；
图21a为图6所示电极组件的第二导电层展开后的截面示意图；
图21b为图6所示电极组件的第二导电层展开后的仰视图；
图22为本申请另一实施例的电极组件的反面示意图；
图23为本申请一实施例提供的电子装置的结构示意图。
主要元件符号说明
电池                                   100
电极组件                               10
壳体                                   20
第一金属板                             101
第二金属板                             102
堆叠部                                 11
第二层                                 12
第一导电层                             111
第二导电层                             112
第一层                                 113
第一表面                               110
第一端部                               11a
第二端部                               11b
第二表面                               120
第一区域                               110a
第二区域                               110b
第一部分                               121
第二部分                               122
标识部                                 30
第三端部                               11c
第四端部                               11d
第五端部                               11e
第六端部                               11f
第七端部                               12a
第八端部                               12b
第一弯曲部                             115
第二弯曲部                             116
第一表面部                             117
第二表面部                             118
第一端                                 11A
第二端                                 11B
第三端                                11C
第四端                                11D
第一重叠区域                          14a
第二重叠区域                          14b
第三重叠区域                          14c
第四重叠区域                          14d
第三层                                17
第九端部                              17a
第十端部                              17b
第一集流体                            111a
第一活性物质层                        111b
第一面                                31a
第二面                                31b
第五层                                18
第二集流体                            112a
第二活性物质层                        112b
第三面                                41a
第四面                                41b
第二焊印                              105
第四层                                19
电子装置                              200
显示屏                                210
第一侧边                              113a
主体                                  220
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。
本申请中，X方向(第一方向)指的是堆叠部的厚度方向。Y方向(第二方向)指的是与X方向相垂直的自第一表面的第二区域向第一区域延伸的方向。Z方向(第三方向)指的是与X方向相垂直的第一金属板自身的延伸方向。
请参阅图1和图2，本申请一实施例提供一种电池100，包括电极组件10以及容纳电极组件10的壳体20。电极组件10的第一金属板101和第二金属板102从壳体20的一端伸出，以连接外部元件。在一些实施例中，壳体20内侧面向电极组件10的表面的至少一部分可以具有导电材料，以提高壳体20的机械强度。壳体20可以为金属壳体，例如可以为钢壳或铝壳等。在另一些实施例中，壳体20还可以为采用封装膜封装得到的包装袋，即电池100为软包电池。
请参阅图2、图4和图6，电极组件10包括堆叠部11和第二层12。堆叠部11包括第一导电层111、第二导电层112和配置于第一导电层111和第二导电层112之间的第一层113。第一层113用于防止第一导电层111和第二导电层112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113包含绝缘材料，该绝缘材料选自聚丙烯、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。堆叠部11设置为卷绕结构。
堆叠部11包括第一表面110、第一端部11a、位于第一端部11a对侧的第二端部11b(参图5)和位于第一表面110对侧的第二表面120(参图5)。第二层12与第一表面110相连接。第一端部11a为位于卷绕结构的最外侧的第一导电层111、第二导电层112或第一层113沿卷绕方向观察时暴露于卷绕结构外的一个端部。图6中，第二导电层112位于卷绕结构的最外侧，即第一端部11a为第二导电层112沿卷绕方向观察时暴露于卷绕结构外的端部。本实施例中，第二导电层112为负极，第一导电层111为正极。
沿X方向观察，第一表面110具有在Y方向上位于第一端部11a的第一侧Y1的第一区域110a以及在Y方向上位于第一侧Y1对侧的第一端部11a的第二侧Y2的第二区域110b。在沿堆叠部的卷绕方向观察时，第二区域110b比第一区域110a更接近第一端部11a。第二层12为片状，其覆盖第一端部11a的至少一部分并与第一区域110a和第二区域110b相连接。第二层12的表面包括在沿X方向观察时与第一区域110a重叠的第一部分121和与第二区域110b重叠的第二部分122。第一部分121和第二部分122中面积较大的一者上设有标识部30，且标识部30离开第一端部11a设置。图4中，第二部分122的面积大于第一部分121的面积，标识部30以离开第一端部11a的方式设在第二部分122上。图10中，第一部分121的面积大于第二部分122的面积，标识部30以离开第一端部11a的方式设在第一部分121上。第一部分121和第二部分122中面积较大的一者与第一表面110的粘接力更强，在外力作用下，面积较大的一者发生脱离的几率更小。将标识部30设在面积较大的一者上，可降低因第二层12脱离第一表面110而导致的污损变形的风险。
在一些实施例中，标识部30离开第一端部11a设置在第一部分121和第二部分122中面积较小的一者上。请参阅图11，第一部分121的面积小于第二部分122的面积，标识部30离开第一端部11a设在第一部分121上。请参阅图13，第二部分122的面积小于第一部分121的面积，标识部30离开第一端部11a设在第二部分122上。在另一些实施方式中，请参阅图12，标识部30设在第一部分121和第二部分122上，并 覆盖第一端部11a的至少一部分。
在一些实施例中，第二层12包含绝缘材料，该绝缘材料选自聚乙烯、聚丙烯、酚醛树脂、三聚氰胺树脂、不饱和聚酯树脂、环氧树脂、有机硅树脂或聚氨酯中至少一种。
在一些实施例中，标识部30是图案、字母、数字、文字、一维条码、二维码、三维码、词条标签及电子标签中的一种或多种的组合。标识部30用于表达标识信息。标识部30表达的标识信息可以包括电池的种类和/或型号、生产商和/或批发商、批号、生产日期或使用寿命中的至少一个。标识部30可通过打印、表面处理、粘贴中的一种或多种方式形成。
沿X方向观察，堆叠部11在Y方向上具有第三端部11c和位于第三端部11c对侧的第四端部11d，第二层12自第三端部11c至第四端部11d配置。在沿X方向观察时，第一导电层111在Z方向上具有第五端部11e和位于第五端部11e对侧的第六端部11f。在Z方向上，第五端部11e和第六端部11f分别超出第二导电层在Z方向上的两个端部，第一层113在Z方向上具有第一侧边113a和位于第一侧边113a对侧的第二侧边(图未示)，第一侧边113a和第二侧边分别超出第五端部11e和第六端部11f。沿X方向观察，第二层12离开第五端部11e和第六端部11f设置。在Z方向上，第二层12具有位于第五端部11e一侧的第七端部12a和位于第七端部12a对侧且位于第六端部11f一侧的第八端部12b，第五端部11e和第七端部12a以及第六端部11f和第八端部12b之间分别具有预设距离。在一些实施例中，在Z方向上，第五端部11e至第七端部12a的距离D1比第六端部11f至第八端部12b的距离D2短。在一些实施例中，在Y方向上，第一端部11a至第三端部11c的距离D3比第一端部11a至第四端部11d的距离D4长。
第一金属板101与第一导电层111相连接，并从壳体20的一端穿出，以连接外部元件。第二金属板102与第二导电层112相连接，并相对第一金属板101从壳体20的同一端穿出，以连接外部元件。沿X方向观察时，第一金属板101和第二金属板102均与第五端部11e具有重叠部分。
请参阅图6，堆叠部11还具备第一弯曲部115、在Y方向上位于第一弯曲部115对侧的第二弯曲部116、沿X方向观察时位于第一弯曲部115和第二弯曲部116之间的第一表面部117以及沿X方向观察时位于第一弯曲部115和第二弯曲部116之间且面向第一表面部117的反面的第二表面部118。位于设置为卷绕结构的堆叠部11的最外侧的第一弯曲部115和位于堆叠部11的最外侧的第一表面部117的连接处为第一端11A。第一端11A为图6中位于第二侧Y2的曲线在卷绕方向上的收尾部分，第一端11A也为位于电极组件10的最内部且位于第二侧Y2的弯折边在X方向上延伸形成的虚线AA与第一表面110相交的部分。位于堆叠部11的最外侧的第二弯曲部116和位于堆叠部11的最外侧的第一表面部117的连接处为第二端11B。第二端11B为图6中位于第一侧Y1的曲线在卷绕方向上的起始部分，第二端11B也为位于电极组件10的最内部且位于第一侧Y1的弯折边在X方向上延伸形成的虚线BB与第一表面110相交的部分。位于堆叠部11的最外侧的第一弯曲部115和位于堆叠部11的最外侧的第二表面部118的连接处为第三端11C。第三端11C为图6中位于第二侧Y2的曲线在卷绕方向上的起始部分，第三端11C也为位于电极组件10的最内部且位于第二侧Y2的弯折边在X方向上延伸形成的虚线AA与第二表面120相交的部分。位于堆叠部11的最外侧的第二弯曲部116和位于堆叠部11的最外侧的第二表面部118的连接处为11D。第四端11D为图6中位于第一侧Y1的曲线在卷绕方向上的收尾部分，第四端11D也为位于电极组件10的最内部且位于第一侧Y1的弯折边在X方向上延伸形成的虚线BB与第二表面120相交的部分。在X方向上，第一端11A和第三端11C相对齐，第二端 11B和第四端11D相对齐。第二层12与第一表面部117、第一弯曲部115和第二弯曲部116连续相接。请参阅图4，沿X方向观察，第一表面部117与第一表面110相重叠，第一表面110与第一弯曲部115具有第一重叠区域14a，第一表面110与第二弯曲部116具有第二重叠区域14b。第二层12覆盖第一表面部117、第一重叠区域14a和第二重叠区域14b中任一者的至少一部分。沿Y方向观察，标识部30以离开所述第一端11A和所述第二端11B的方式设置，即使得标识部在卷绕方向上离开第一弯曲部115和第二弯曲部116设置，以使标识部30显示得更清楚。
请参阅图7，沿Y方向观察，第二层12自第一端11A配置，并覆盖第一弯曲部115的一部分。在一些实施例中，在沿Y方向观察时，第二层12可自第一端11A至第三端11C配置，或者第二层12不与第一弯曲部115相连接。请参阅图8，沿Y方向观察，在X方向上，第二层12自第二端11B配置，并覆盖第二弯曲部116的一部分。在一些实施例中，在沿Y方向观察时，第二层12可自第二端11B至第四端11D配置，或者第二层12不与第二弯曲部116相连接。
请参阅图9，在一些实施例中，沿X方向观察，第二层12在Y方向上覆盖第一表面110的一部分。沿X方向观察，第二层12在Y方向上具有位于第三端部11c一侧的第十一端部12c和位于第十一端部12c对侧且位于第四端部11d一侧的第十二端部12d，第十一端部12c离开第三端部11c设置，且第十二端部12d离开第四端部11d设置。在其他实施方式中，沿X方向观察，第十一端部12c和第十二端部12d中的一者可离开相应的第三端部11c或第四端部11d设置，另一者可与相应的第三端部11c或第四端部11d相接。图9中，第十一端部12c与第三端部11c之间的距离D5和第十二端部12d与第四端部11d之间的距离D6相等，且第十一端部12c和第十二端部12d分别离开第一端11A和第二端11B设置。
请参阅图13，在一些实施例中，沿X方向观察，第二层12与第六端部11f具有重叠的部分。第八端部12b与第六端部11f相重叠。沿X方向观察，第二层12在Z方向上自第六端部11f配置，并离开第五端部11de设置。通过增大第二层12的面积，可提高第二层12与第一表面110之间的附着力，可降低第二层12脱离第一表面110的风险。
请参阅图14，第二层12还与第二表面部118相连接。沿X方向观察，第二表面部118与第二表面120相重叠，第二表面120与第一弯曲部115具有第三重叠区域14c，第二表面120与第二弯曲部116具有第四重叠区域14d。沿X方向观察，第二层12在Y方向上还覆盖第三重叠区域14c和第二表面部118的一部分。在一些实施例中，请参阅图15，沿X方向观察，第二层12在Y方向上还覆盖第三重叠区域14c、第二表面部118和第四重叠区域14d。
请参阅图16、图17和图18，电极组件10还包括第三层17。第三层17为片状。第三层17与第一表面110相连接，离开第二层12设置，与第六端部11f具有重叠的部分，并与第一端部11a具有重叠的部分。通过设置第三层17，进一步紧固第一端部11a，可降低因第二区域110b脱离第一区域110a而导致的变形的风险。沿X方向观察，第三层17在Z方向上具有第九端部17a和位于第九端部17a对侧的第十端部17b。在Z方向上，第八端部12b到第九端部17a的距离D7与第九端部17a到第十端部17b的距离D8不同。在一些实施例中，第八端部12b到第九端部17a的距离D7比第九端部17a到第十端部17b的距离D8短。
在一些实施例中，第三层17包含绝缘材料，该绝缘材料选自聚乙烯、聚丙烯、酚醛树脂、三聚氰胺树脂、不饱和聚酯树脂、环氧树脂、有机硅树脂和聚氨酯中至少一种。
在一些实施例中，第三层17与第一表面部117和第二表面部118连续相接。第三层17与第一表面部117和第二表面部118连续相接， 从而在X方向上压紧堆叠部11，可降低因堆叠部11的第一导电层、第二导电层或第一层发生位移而引起变形的风险。
请参阅图6和图19，第一导电层111包括第一集流体111a和第一活性物质层111b。第一集流体111a包括相对设置的第一面31a和第二面31b。第一面31a和第二面31b均包括设有第一活性物质层111b的区域和离开第一活性物质层111b的区域。第一集流体111a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。第一活性物质层111b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。
第一面31a和第二面31b离开第一活性物质层111b的区域均设置有第五层18，每个第五层18均与第一活性物质层111b相连接。第五层18覆盖第一活性物质层11b和第一导电层111的交界处，可防止因第一活性物质层11b脱落而导致的第一导电层111和第二导电层112直接接触，防止短路。第一金属板101焊接于第二面31b离开第一活性物质层111b的区域。第一金属板101和第二面31b之间形成有第一焊印(图未示)。其中一个第五层18设置在第二面31b上并覆盖第一金属板101和第一焊印，另一个第五层18设置在第一面31a上并覆盖第一面31a上与第一焊印的位置相对的区域，以抑制因焊印毛刺导致刺穿第一层113的现象发生，防止第一导电层111和第二导电层112接触短路。第五层18包含绝缘材料，该绝缘材料选自聚乙烯、聚丙烯、酚醛树脂、三聚氰胺树脂、不饱和聚酯树脂、环氧树脂、有机硅树脂或聚氨酯中至少一种。
请参阅图6、图21a和图21b，第二导电层112包括第二集流体112a和第二活性物质层112b。第二集流体112a包括相对设置的第三面41a和第四面41b。第三面41a和第四面41b均包括设有第二活性物质层112b的区域和离开第二活性物质层112b的区域。第二集流体112a的一个端部为第一端部11a，在沿堆叠部的卷绕方向(沿Y方向进行卷绕)观察时，第二区域110b比第一区域110a更接近第一端部11a。第二集流体112a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。第二活性物质层112b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。第二金属板102焊接于第三面41a离开第一活性物质层111b的区域。第三面41a和第四面41b上与第二金属板102相对应的区域均设置有第四层19。第四层19包括绝缘材料，该绝缘材料选自聚乙烯、聚丙烯、酚醛树脂、三聚氰胺树脂、不饱和聚酯树脂、环氧树脂、有机硅树脂或聚氨酯中至少一种。
请参阅图5和图6，第二金属板102和第三面41a之间形成有第二焊印105。第二金属板102与位于堆叠部11形成的卷绕结构的最外侧的第二导电层112相连接，由此导致第二焊印105的焊印毛刺可能刺穿壳体。其中一个第四层19设置于第二表面120上。沿X方向观察，第四层19覆盖第二焊印105，以隔开第二焊印105和壳体，降低因焊印毛刺导致的问题。请参阅图22，在其他实施例中，沿X方向观察，第四层19在Y方向上覆盖第二表面部118，并在Z方向上覆盖第二表面部118的一部分，第四层19离开第三层17设置。通过增大第四层19和第二表面部118的重叠面积，可提高电极组件10厚度的平整性。
请参阅图23，本申请的实施例还提供一种电子装置200，电子装置200包括显示屏210、主体220和电池100。显示屏210安装于主体220上，电池100收容于主体220内。从与显示屏210相垂直的方向观察时，可观察到电池100的标识部30。在一些实施例中，标识部30面向主体 220上位于显示屏210对侧的部分区域设置。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。
本申请通过将标识部30设置在容纳于壳体20中的电极组件10上，可抑制因电池100外部撞击摩擦等外力导致标识部无法辨别的现象发生；且将标识部30设置第二层12的面积较大的第一部分121或第二部分122上，面积较大的一者在外力作用下不易脱离堆叠部11的表面，从而降低因第二层12脱离而导致的污损变形的风险。
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
采用如图11所示的电极组件10，装入壳体，经注液、封装、化成后得到成品电池。其中，标识部30位于具有较小面积的第一部分121上。
实施例2
采用如图13所示的电极组件10，装入壳体，经注液、封装、化成后得到成品电池。其中，标识部30位于具有较小面积的第二部分122上。
实施例3
采用如图12所示的电极组件10，装入壳体，经注液、封装、化成后得到成品电池。其中，标识部30覆盖第一端部11a的一部分。
实施例4
采用如图10所示的电极组件10，装入壳体，经注液、封装、化成后得到成品电池。其中，标识部30位于具有较大面积的第一部分121上。
实施例5
采用如图4所示的电极组件10，装入壳体20(参图3)，经注液、封装、化成后得到成品电池。其中，标识部30位于具有较大面积的第二部分122上。
对比例1
制备与实施例5同样的电极组件10，装入壳体，经注液、封装、化成后得到成品电池。不同之处在于，标识部30位于壳体外表面。
本申请中，在壳体外表面设置的标识部30与实施例1至5中设置的标识部可以具有相同或类似的结构，可以通过相同或类似的方法设置，可以用于记录信息。
取对比例的电池20个样品进行跌落测试。
每组实施例的电池各取20个样品进行跌落测试和循环测试。测试结果如表1所示。
跌落测试：将电池样品装入夹具中，在1.8m高度进行10次跌落测试，。统计标识部污损的数量，污损的判断标准为：观察测试后的标识部，如不可辨认，则认为污损。
循环测试：将电池样品以0.2C恒流充电至4.45V，恒压充电至0.05C，然后以0.2C放电至3V。重复此种充放电循环流程1000次。统计标识部变形的数量，变形的判断标准为：选取标识部所在平面的一个方向，对比循环测试前后标识部在此方向上的尺寸，如循环测试后的尺寸增长率≥3％，则认为变形。
表1
Figure PCTCN2021112219-appb-000001
注：X/20表示测试20个样品中标识部污损或变形的个数为X个。
从表1测试结果可知，对比实施例1至5和对比例1，将标识部设置在壳体外表面，在跌落测试中标识部污损的概率较大；而将标识部设置在壳体内的电极组件表面，标识部污损概率较小。
对比实施例1至5可知，将标识部设置在第二层与第一区域或第二区域重叠的部分中面积较大的一者上，在电池的充放电循环过程中，可以具有较小的标识部变形概率。
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 (25)

  1. 一种电池，包括电极组件，所述电极组件包括堆叠部和第二层，所述堆叠部包括第一导电层、第二导电层和配置于所述第一导电层和第二导电层之间且包含绝缘材料的第一层，其特征在于，
    所述堆叠部设置为卷绕结构且还包括第一表面和第一端部；
    定义所述电极组件的厚度方向为第一方向，沿所述第一方向观察，所述第一表面具有位于所述第一端部的第一侧的第一区域以及位于所述第一端部的第二侧的第二区域，在与所述第一方向相垂直的第二方向上，所述第一侧和所述第二侧位于所述第一端部的相对的两侧，在所述堆叠部的卷绕方向上，所述第二区域比所述第一区域更接近所述第一端部；
    所述第二层覆盖所述第一端部的至少一部分并与所述第一区域和所述第二区域相连接，所述第二层设有标识部。
  2. 如权利要求1所述的电池，其特征在于，沿所述第一方向观察，所述第二层包括与所述第一区域重叠的第一部分和与所述第二区域重叠的第二部分，所述标识部以离开所述第一端部的方式设置于所述第一部分或所述第二部分中至少一者上。
  3. 如权利要求2所述的电池，其特征在于，所述标识部设置于所述第一部分和所述第二部分中面积较大的一者。
  4. 如权利要求2所述的电池，其特征在于，所述标识部设置于第一部分和第二部分中面积较小的一者。
  5. 如权利要求1所述的电池，其特征在于，沿所述第一方向观察，所述标识部覆盖所述第一端部的至少一部分。
  6. 如权利要求1所述的电池，其特征在于，沿所述第一方向观察，在所述第二方向上，所述堆叠部具有第三端部和位于所述第三端部对侧的第四端部；
    沿所述第一方向观察，所述第二层自所述第三端部至所述第四端部配置。
  7. 如权利要求1所述的电池，其特征在于，沿所述第一方向观察，在与所述第一方向和所述第二方向相垂直的第三方向上，所述堆叠部具有第五端部和位于所述第五端部对侧的第六端部；
    沿所述第一方向观察，所述第二层以离开所述第五端部和所述第六端部的方式设置。
  8. 如权利要求7所述的电池，其特征在于，在所述第三方向上，所述第二层具有位于所述第五端部一侧的第七端部和位于所述第七端部对侧且位于所述第六端部一侧的第八端部；
    在所述第三方向上，所述第五端部至所述第七端部的距离比所述第六端部至所述第八端部的距离短。
  9. 如权利要求7所述的电池，其特征在于，所述电极组件还包括第一金属板，所述第一金属板与所述第一导电层相连接，沿所述第一方向观察，所述第一金属板与所述第五端部具有重叠的部分。
  10. 如权利要求6所述的电池，其特征在于，沿所述第二方向，所述第一端部至所述第三端部的距离比所述第一端部至所述第四端部的距离长。
  11. 如权利要求1所述的电池，其特征在于，所述堆叠部还具备第一弯曲部、在所述第二方向上位于所述第一弯曲部对侧的第二弯曲部、沿所述第一方向观察时位于所述第一弯曲部和所述第二弯曲部之间的第一表面部以及沿所述第一方向观察时位于所述第一弯曲部和所述第二弯曲部之间且面向所述第一表面部的反面的第二表面部。
  12. 如权利要求11所述的电池，其特征在于，所述第二层与所述第一表面部、所述第一弯曲部以及所述第二弯曲部连续相接。
  13. 如权利要求11所述的电池，其特征在于，所述第二层与所述第一表面部、所述第一弯曲部、所述第二弯曲部以及所述第二表面部连续 相接。
  14. 如权利要求12或13所述的电池，其特征在于，在所述堆叠部的卷绕方向上，所述标识部以离开所述第一弯曲部和所述第二弯曲部的方式设置。
  15. 如权利要求11所述的电池，其特征在于，沿所述第一方向观察，所述堆叠部在所述第二方向上具有第三端部以及位于所述第三端部对侧的第四端部，所述堆叠部在与所述第一方向和所述第二方向相垂直的第三方向上具有第五端部和位于所述第五端部对侧的第六端部。
  16. 如权利要求15所述的电池，其特征在于，沿所述第一方向观察，所述电极组件包括包含绝缘材料的第三层，所述第三层与所述第一表面相连接并与所述第六端部具有重叠的部分，在所述第三方向上，所述第三层以离开所述第二层的方式设置。
  17. 如权利要求16所述的电池，其特征在于，所述第三层与所述第一表面部和所述第二表面部连续相接。
  18. 如权利要求17所述的电池，其特征在于，所述第三层在所述第三方向上具备第九端部和位于所述第九端部对侧的第十端部，所述第二层在所述第三方向上具有第七端部和位于所述第七端部对侧且位于所述第十端部一侧的第八端部，在所述第三方向上，所述第八端部到所述第九端部的距离与所述第九端部到所述第十端部的距离不同。
  19. 如权利要求18所述的电池，其特征在于，所述第八端部到所述第九端部的距离比所述第九端部到所述第十端部的距离短。
  20. 如权利要求1所述的电池，其特征在于，所述第一导电层包括第一集流体和第一活性物质层。
  21. 如权利要求20所述的电池，其特征在于，所述第一集流体包括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，所述第一活性物质层包括钴酸锂、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、钛酸锂及其组合物中的至少一种。
  22. 如权利要求1所述的电池，其特征在于，所述电极组件还包括第二金属板，所述第二金属板焊接于在所述堆叠部卷绕形成的卷绕结构中位于最外侧的第二导电层，所述第二金属板与所述第二导电层之间形成有焊印，所述堆叠部还包括位于所述第一表面对侧的第二表面，所述第二表面设置有第四层，从所述第一方向观察，所述第四层覆盖所述焊印。
  23. 如权利要求1所述的电池，其特征在于，所述电池还包括容纳所述电极组件的壳体。
  24. 如权利要求23所述的电池，其特征在于，所述壳体内侧面向所述电极组件的表面的至少一部分具有导电材料。
  25. 一种电子装置，其特征在于，所述电子装置包括如权利要求1至24中任一项所述的电池。
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JP2000251866A (ja) * 1999-03-01 2000-09-14 Sanyo Electric Co Ltd リチウムイオン電池
CN1518157A (zh) * 2003-01-18 2004-08-04 ����Sdi��ʽ���� 电池单元以及采用了该单元的锂二次电池
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