WO2016064100A1 - Accumulateur à structure d'éléments étagés - Google Patents

Accumulateur à structure d'éléments étagés Download PDF

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Publication number
WO2016064100A1
WO2016064100A1 PCT/KR2015/010150 KR2015010150W WO2016064100A1 WO 2016064100 A1 WO2016064100 A1 WO 2016064100A1 KR 2015010150 W KR2015010150 W KR 2015010150W WO 2016064100 A1 WO2016064100 A1 WO 2016064100A1
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WIPO (PCT)
Prior art keywords
pocketing
electrode assembly
positive electrode
secondary battery
cell structure
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PCT/KR2015/010150
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English (en)
Korean (ko)
Inventor
김경준
김인중
정영호
최승호
Original Assignee
주식회사 루트제이드
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Publication of WO2016064100A1 publication Critical patent/WO2016064100A1/fr

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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
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • 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
    • 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
    • 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
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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 invention relates to a secondary battery having a step cell structure, and more particularly, to a lithium ion secondary battery having a step cell structure configured to make maximum use of a storage space in an electronic device in which the secondary battery is mounted or accommodated.
  • This lithium-ion secondary battery is rapidly becoming a new energy source of portable electronic devices in recent years because of its relatively high energy density and charge / discharge life per unit weight compared with conventional aqueous secondary batteries such as nickel-cadmium and nickel-hydrogen. It replaces existing battery.
  • conventional aqueous secondary batteries such as nickel-cadmium and nickel-hydrogen. It replaces existing battery.
  • lithium ion secondary batteries do not satisfy such demands at present.
  • the present applicant has developed a secondary battery using a pocketed electrode body in order to solve this problem, and Korean Patent Nos. 10-1168651 and 10-0337707 filed and registered by the present applicant have been developed. Disclosed is a lithium ion secondary battery and a manufacturing technology using the prepared electrode body.
  • the lithium ion secondary battery using the pocketing electrode body has a typical shape such as a coin type, a flat type such as a button type or a button type, or a pouch type. Since it is common to manufacture, there is still a problem that a secondary battery having a typical shape cannot be used when the shape or shape of the electronic device in which the secondary battery is used is changed.
  • the secondary battery since the existing secondary battery does not effectively utilize the remaining space, the secondary battery may have a satisfactory level to be applied to a curved electronic device or an electronic device having an uneven portion space in terms of battery capacity and usage time. It doesn't come
  • the present applicant has a form and structure which can increase the battery capacity or use time of the secondary battery by efficiently utilizing the remaining space of the storage space, and can impose restrictions on the form of the electronic device in which the secondary battery is used. It is intended to propose a lithium ion secondary battery having a stepped cell structure.
  • the present invention in order to solve the above problems, to maximize the storage space of the electronic device in which the secondary battery is stored without degrading the performance of the battery, and also can be used compatible with the shape of the storage space, A secondary battery having a step cell structure can be provided.
  • a lithium ion secondary battery having a step cell structure includes: a first electrode assembly in which a plurality of first pocketing positive electrodes and first negative electrodes having the same size are alternately stacked; And a plurality of second pocketing anodes and a second cathode body having the same size are alternately stacked, and formed to have a size smaller than that of the first electrode assembly, and is provided above or below the first electrode assembly. And a second electrode assembly, wherein the first electrode assembly may be larger than the second electrode assembly.
  • a third pocketing anode body having the same size as the first pocketing anode body is stacked on the uppermost end of the first electrode assembly, and the anode plate of the third pocketing anode body is the same as or smaller than the cathode plate of the second cathode body. It may be formed, and may be formed smaller than the positive plate of the first pocketing positive electrode.
  • the first pocketing positive electrode, the second pocketing positive electrode, and the third pocketing positive electrode may include: a positive electrode plate having a coating layer of a lithium or lithium metal composite oxide as a positive electrode active material and a plain protrusion; A pair of separators covering both surfaces of the positive electrode plate while exposing only the plain protrusion; And an insulating polymer film positioned between the pair of separators at an entire circumference or a part of the circumference of the positive electrode plate and bonded to the pair of separators.
  • the first negative electrode body and the second negative electrode body may include a negative electrode plate having a carbonaceous negative electrode active material coating layer capable of occluding and releasing lithium and a plain protrusion.
  • the punching space shapes of the insulating polymer film of the first pocketing anode body and the third pocketing anode body may be the same.
  • the size or area of the punching space formed in the insulating polymer film of the third pocketing anode may be the same as or smaller than the size or area of the punching space formed in the insulating polymer film of the first pocketing anode.
  • the edge of the positive electrode plate of the third pocketing positive electrode is formed inwardly than the edge of the negative electrode plate of the second negative electrode body, and the positive electrode plate of the third pocketing positive electrode is larger than the edge of the positive electrode plate of the first pocketing positive electrode. It may be formed so that the edge is inward.
  • the distance between the cathode plate and the insulating polymer film may be equally formed.
  • the first cathode body may be disposed at upper and lower ends of the first electrode assembly, and the second cathode body may be disposed at upper and lower ends of the second electrode assembly, respectively.
  • a carbonaceous negative electrode active material coating layer capable of absorbing and releasing lithium may be formed in the first negative electrode body disposed on the upper and lower ends of the first electrode assembly and the second negative electrode body respectively disposed on the upper and lower ends of the second electrode assembly.
  • the negative electrode active material coating layer may include a bottom surface of the first cathode body disposed on the top of the first electrode assembly, an upper surface of the first cathode body disposed on the bottom of the first electrode assembly, and a second electrode assembly of the second electrode assembly. It may be formed on the bottom surface of the second cathode body disposed on the upper end and the top surface of the second cathode body disposed on the lower end of the second electrode assembly.
  • a positioning member for guiding a stacking position of the second electrode assembly stacked above or below the first electrode assembly may be provided at an upper side or a lower side of the first electrode assembly.
  • the positioning member may be a through hole through which the second electrode assembly may pass.
  • a secondary battery having a step cell structure includes a secondary battery accommodating space or an electronic component of an electronic device having a plurality of electrode assemblies having different sizes, stacked in multiple stages, and having a curved curved space. Since the height according to the arrangement may be accommodated in the secondary battery storage space of the electronic device having the uneven portion, it is possible to make the most of the secondary battery storage space in the electronic device.
  • the secondary battery having a step cell structure according to an embodiment of the present invention can maximize the remaining space of the secondary battery storage space of the electronic device, thereby increasing battery capacity and battery usage time.
  • the secondary battery having the step cell structure according to the embodiment of the present invention does not limit the secondary battery storage space of the electronic device to an existing square or cylinder, the electronic device can be designed in various designs. .
  • FIG. 1 is an exploded perspective view of a secondary battery having a step cell structure according to an embodiment of the present invention.
  • Figure 2 is a perspective view of a secondary battery having a step cell structure according to an embodiment of the present invention.
  • FIG. 3 is a cross-sectional view of the secondary battery illustrated in FIG. 2 viewed in the direction of arrow A-A '.
  • FIG. 4 is a plan view of a first pocketing anode according to an embodiment of the present invention.
  • FIG. 5 is a plan view of a third pocketing anode according to an embodiment of the present invention.
  • FIG. 6 is a plan view of a second pocketing anode according to an embodiment of the present invention.
  • FIG. 7 is a view from above of a state in which a second cathode body is stacked on a third pocketing anode body shown in FIG. 3;
  • FIG. 8 is a cross-sectional view illustrating a state in which the width of the insulating polymer film of the third pocketing anode shown in FIG. 3 is increased.
  • FIG. 9 is a plan view of the third pocketing anode shown in FIG. 7; FIG.
  • FIG. 10 is a view as viewed from above of a second cathode body laminated on the third pocketing anode body shown in FIG. 7; FIG.
  • FIG. 11 is a reference diagram showing a state in which a secondary battery having a step cell structure according to an embodiment of the present invention is inserted into a secondary battery accommodation space of an electronic device having a curved shape.
  • FIG. 12 is a cross-sectional view of a secondary battery having a step cell structure according to another embodiment of the present invention.
  • FIG. 13 is a perspective view showing a state in which the second electrode assembly is laminated on the first electrode assembly by the positioning member according to the embodiment of the present invention.
  • FIG. 14 is a cross-sectional view showing a second electrode assembly according to an embodiment of the present invention is guided by the positioning member laminated to the first electrode assembly.
  • the secondary battery 100 having a step cell structure according to an embodiment of the present invention includes a lithium ion secondary battery, but is not limited to the lithium ion secondary battery.
  • the secondary battery 100 according to the embodiment of the present invention is a lithium ion secondary battery will be described as an example.
  • the secondary battery 100 having a step cell structure includes a structure in which a plurality of electrode assemblies having different sizes are stacked in a vertical direction or in multiple stages.
  • a case in which two electrode assemblies having different sizes are stacked on top of each other will be described as an example.
  • the secondary battery 100 includes a first electrode assembly 130 in which a plurality of first pocketing anodes 110 and first cathode bodies 120 having the same size are alternately stacked. ; The plurality of second pocketing anodes 140 and the second cathode body 150 having the same size are alternately stacked and have a size smaller than that of the first electrode assembly 130. A second electrode assembly 160 provided on the assembly 130; And a third pocketing anode body 170 stacked on the top of the first electrode assembly 130 and having the same size as the first pocketing anode body 110.
  • the positive electrode plate 171 of the sieve 170 may be formed to be the same as or smaller than the negative electrode plate 151 of the second negative electrode body 150, and may be smaller than the positive electrode plate 111 of the first pocketing positive electrode body 110. have.
  • the third pocketing anode body 170 is disposed between the first electrode assembly 130 and the second electrode assembly 160, and thus, the third pocketing anode body 170 is in contact with the third pocketing anode body 170.
  • the first cathode body 120 and the second cathode body 150 may naturally be disposed at an uppermost end of the first electrode assembly 130 and at a lower end of the second electrode assembly 160.
  • the electrical resistance of the relatively smaller electrode assembly 160 among the first electrode assembly 130 and the second electrode assembly 160 is smaller than the electrical resistance of the relatively large electrode assembly 130. This is because the relatively small electrode assembly 160 is likely to degenerate first to lose its function as a battery, and the electrode assembly 130 having a large function maintenance period as a battery by reducing the electrical resistance of the small electrode assembly 160 is large. You can keep it similar to
  • the first pocketing positive electrode 110, the second pocketing positive electrode 140, and the third pocketing positive electrode 170 are lithium or lithium metal as positive electrode active materials.
  • Positive electrode plates 111, 141, and 171 having a coating layer of the composite oxide and plain protrusions 111a, 141a, and 171a;
  • a pair of separators 112, 142, and 172 covering both surfaces of the positive electrode plates 111, 141, and 171 while exposing only the plain protrusions 111a, 141a, and 171a;
  • an insulating layer disposed between the pair of separators 112, 142, and 172 at the entire circumference or a part of the circumference of the positive electrode plates 111, 141, and 171 and bonded to the pair of separators 112, 142, and 172.
  • It may include a polymer film (114, 144, 174).
  • the insulating polymer film (114, 144, 174) is a polyolefin resin film, polyester resin film, polystyrene resin film, polyimide film, polyamide film, fluorocarbon resin film, ABS film, polyacrylic film, It may include any one selected from the group consisting of acetal-based film, polycarbonate film.
  • the insulating polymer film 114, 144, 174 is a hot melt adhesive material composed of ethylene vinyl acetate, ethylene ethyl acetate, ethylene acrylic acid compound, ionomer compound, polyethylene, polyvinyl acetate, polyvinyl butyral It is preferred to include any one of the adhesive components selected from the group.
  • the punching spaces 115, 145, and 175 of the insulating polymer films 114, 144, and 174 are spaces in which the positive electrode plates 111, 141, and 171 are accommodated, and the positive electrode plates 111, 141, and 171 are spaced at regular intervals. It may be formed larger than the size of the positive electrode plate (111, 141, 171) to be accommodated with.
  • the punching spaces 115, 145, and 175 may be formed in various shapes as long as a condition that may include a circumference or a part of the circumference of the positive electrode plates 111, 141, and 171 is satisfied.
  • the positive electrode plates 111, 141, and 171 are formed in a rectangular shape having the plain protrusions 111a, 141a, and 171a.
  • the punching spaces 115, 145, and 175 of the insulating line polymer films 114, 144, and 174 may be formed in a shape including the entire circumference of the positive electrode plates 111, 141, and 171.
  • Insulation of the insulating polymer film 114 of the first pocketing anode body 110 and the insulating polymer film 144 of the second pocketing anode body 140 and the third pocketing anode body 170 is performed.
  • the punching spaces 115, 145, and 175 formed in the polymer film 174 may have the same shape.
  • the area of the punching space 175 formed in the insulating polymer film 174 of the third pocketing anode body 170 is the first pocketing anode body 110.
  • the insulating polymer film 114 may be formed to have the same area as the punching space 115.
  • the punching formed on the third pocketing anode body 170 is performed.
  • the area of the space 175 is the same as the area of the punching space 115 formed in the first pocketing anode body 110, the positive electrode plate 171 and the insulating polymer film 174 of the third pocketing anode body 170 are provided.
  • the gap d1 may be formed longer or larger than the gap d2 formed between the positive electrode plate 111 and the insulating polymer film 114 of the first pocketing anode body 110.
  • the third space is measured. Since the insulating polymer film 174 used for the pocketing anode 170 and the insulating polymer film 114 used for the first pocketing anode 110 are compatible with each other in the same shape, the insulating polymer film In the process of manufacturing (114, 174) there is an advantage that does not need to separately prepare a production line of the polymer film.
  • the space formed by the gap d1 between the positive electrode plate 171 of the third pocketing positive electrode 170 and the insulating polymer film 174 is the positive electrode plate 111 of the first pocketing positive electrode 110. Since it is larger than the space formed by the interval d2 between the insulating polymer film 174 and the gap d1 between the positive electrode plate 171 of the third pocketing anode body 170 and the insulating polymer film 174.
  • the pair of separators 172 partitioning the formed space may be deformed, thereby degrading the performance of the battery.
  • the separation membrane 172 is the cathode plate 171 or the gap between the anode plate 171 and the insulating line polymer film 174 is larger than the first pocketing anode body 110.
  • the separator 172 may be struck at an interval between the positive electrode plate 171 and the insulating polymer film 174 without being supported by the insulating polymer film 174.
  • the area or size of the punching space 175 formed in the insulating polymer film 174 of the third pocketing anode body 170 may be determined by the first pocketing anode body ( The gap between the positive electrode plate 171 of the third pocketing anode body 170 and the insulating polymer film 174 is formed smaller than the area or size of the punching space 115 partitioned by the insulating polymer film 114 of 110. d1) or area may be reduced.
  • the width d3 of the plain protrusion 171a of the third pocketing anode body 170 is defined by the first pocketing anode body 110 and the second pocketing. It is preferable that the widths d4 and d5 of the plain protrusions 111a and 141a of the positive electrode body 140 are the same.
  • the first negative electrode body 120 and the second negative electrode body 150 may have a carbonaceous negative electrode active material coating layer capable of occluding and releasing lithium, and the plain protrusions 121a and 151a (see FIGS. 1 and 2).
  • the negative electrode plates 121 and 151 may be included.
  • the negative electrode plate 121 of the first negative electrode body 120 has the same size as the separator 112 of the first pocketing positive electrode body 110, and thus, the edge of the negative electrode plate 121 has a first pocket. It may be coincident with the edges of the remaining portions except for the plain protrusion 111a of the casting anode body 110. That is, the negative electrode plate 121 of the first negative electrode body 120 is formed to have the same size and shape as the first pocketing positive electrode body 110.
  • the negative electrode plate 121 of the first negative electrode body 120 may be configured to stably occlude lithium ions emitted from the positive electrode plate 111 of the first pocketing positive electrode body 110. It is essential to form larger than size.
  • the plain protrusion 121a of the negative electrode plate 121 is spaced apart from the plain protrusion 111a of the first pocketing positive electrode 110 and the plain protrusion 171a of the third pocketing positive electrode 170. It may be formed or disposed at another location, such as a location or an opposite location.
  • the negative electrode plate 151 of the second negative electrode body 150 has the same size as the separator 142 of the second pocketing positive electrode 140, and thus, the edge of the negative electrode plate 151 has the second pocket. It may coincide with the edges of the remaining portions except for the plain protrusion 141a of the anode anode 140. That is, the negative electrode plate 151 of the second negative electrode body 150 is formed to have the same size and shape as the second pocketing positive electrode body 140.
  • the negative electrode plate 151 of the second negative electrode body 150 has the second pocketing positive electrode body (2) to stably occlude lithium ions emitted from the positive electrode plate 141 of the second pocketing positive electrode body 140. It is necessary to form larger than the size of the positive electrode plate 141 of 140.
  • the plain protrusion 151a of the negative electrode plate 151 may be disposed at a position spaced apart from or opposite to the plain protrusion 141a of the second pocketing positive electrode 140, and may be disposed on the opposite side of the first cathode body 120.
  • the negative electrode plate 121 may be stacked in alignment with the plain protrusion.
  • the negative electrode plate 151 of the second negative electrode body 150 may be formed to be the same as or larger than the size of the positive electrode plate 171 of the third pocketing positive electrode 170.
  • the third pocketing anode 170 positioned at the top of the first electrode assembly 130 is positioned at the bottom of the second electrode assembly 150.
  • the anode plate 171 covers the entire area of the anode plate 171 of the third pocketing anode body 170 while the cathode plate 151 of the second cathode body 150 covers the entire area. It is possible to stably occlude lithium ions emitted from the.
  • the third pocketing anode body 170 may be included in the first electrode assembly 130.
  • the secondary battery 100 having the step cell structure according to the exemplary embodiment of the present invention having the above configuration as illustrated in FIG. 11, a plurality of electrode assemblies 130 and 150 having different sizes are arranged in multiple stages. Since the secondary battery accommodating space 200 of the electronic device having a curved curved space or shape stacked above and below or the height according to the arrangement of the electronic components may be accommodated in the secondary battery accommodating space of the electronic device having the uneven parts, In addition, the secondary battery storage space in the electronic device can be utilized to the maximum.
  • the secondary battery 200 having the step cell structure according to another embodiment of the present invention is similar to the secondary battery 100 having the step cell structure according to the embodiment of the present invention.
  • the electrode assembly 130 ′ and the second electrode assembly 160 ′ may be included.
  • the secondary battery 200 having the step cell structure according to another embodiment of the present invention may include a plurality of pocketing anodes constituting the first electrode assembly 130 ′ and the second electrode assembly 160 ′ ( 110 ', 140') and the negative electrode bodies 120 ', 150' are different from the secondary battery 100 having the step cell structure according to the embodiment of the present invention.
  • the electrode assemblies 130 'and 160' having different sizes may be stacked up and down without having the third pocketing anode body 170 described in the embodiment.
  • the secondary battery 200 having the step cell structure according to another embodiment of the present invention, as shown in Figure 12, a plurality of first pocketing positive electrode body 110 'and the first cathode having the same size.
  • the plurality of second pocketing anodes 140 ′ and the second cathode body 150 ′ having the same size are alternately stacked and have a size smaller than that of the first electrode assembly 130.
  • a second electrode assembly 160 ' provided at an upper side or a lower side of the first electrode assembly 130', and formed at upper and lower ends of the first electrode assembly 130 'and the second electrode assembly 160'.
  • the first cathode body 120 ′ and the second cathode body 150 ′ may be further disposed.
  • the first electrode assembly 130 ′ and the second electrode assembly 160 ′ may include the first electrode assembly 130 and the first electrode assembly 130 of the secondary battery 100 having a step cell structure according to an embodiment of the present invention. Since the structure of the two-electrode assembly 160 is substantially the same, a detailed description of the same parts will be omitted below.
  • the first cathode body 120 ′ disposed at the top and bottom of the first electrode assembly 130 ′ and the second cathode body 150 ′ disposed at the top and bottom of the second electrode assembly 160 ′ are disposed in the first electrode assembly 130 ′.
  • the first electrode assembly 130 and the second electrode of the secondary battery 100 having a step cell structure according to an embodiment of the present invention is that a carbonaceous negative electrode active material capable of occluding and releasing lithium is coated or coated on only one surface thereof. Is different from assembly 160.
  • the first cathode body 120 ′ and the first electrode having the same polarity at the uppermost end of the first electrode assembly 130 ′ and the lowest end of the second electrode assembly 160 ′.
  • the second cathode body 150 ′ is disposed, and accordingly, is disposed at the top of the first electrode assembly 130 ′ in the stacking process of the first electrode assembly 130 ′ and the second electrode assembly 160 ′. Since the first cathode body 120 ′ and the second cathode body 150 ′ disposed at the bottom of the first electrode assembly 130 ′ are in contact with each other, the first cathode body 120 ′ and the first cathode body 120 ′ are in contact with each other.
  • the anode active material does not need to be coated or coated on the surface where the second cathode body 150 ′ contacts each other.
  • first cathode body 120 ′ disposed at the bottom end of the first electrode assembly 130 ′ and the second cathode body 150 ′ disposed at the top of the second electrode assembly 160 ′ may be formed. Since it is in contact with the secondary battery casing (not shown), the anode active material does not need to be coated or coated on the surface in contact with the secondary battery casing.
  • the bottom of the first cathode body 120 ′ disposed on the top of the first electrode assembly 130 ′ and the bottom of the first electrode assembly 130 ′ of the first cathode body 120 ′ is disposed.
  • the negative electrode active material is coated or coated only on the top surface, and is disposed on the bottom surface of the second cathode body 120 ′ disposed on the top of the second electrode assembly 160 ′ and the bottom of the second electrode assembly 130 ′. Since the negative electrode active material is coated or coated only on the upper surface of the second negative electrode body 120 ′, the material cost required to manufacture the first electrode assembly 130 ′ and the second electrode assembly 160 ′ may be reduced. have.
  • the secondary battery 200 having the step cell structure according to another embodiment of the present invention is different from the secondary battery 100 having the step cell structure according to the embodiment of the present invention. Since the first electrode assembly 130 ′ and the second electrode assembly 160 ′ may be stacked without having a 170, the first pocketing anode constituting the first electrode assembly 130 ′ ( The size of the positive electrode plates 111 'of the 110' may be maintained the same, and the size of the positive electrode plates 141 'of the second pocketing positive electrode 140' constituting the second electrode assembly 160 'may be maintained.
  • the size of the plurality of positive electrode plates 111 'constituting the first electrode assembly 130' or the plurality of positive electrode plates 141 'constituting the second electrode assembly 160' It is not necessary to manufacture different separate positive electrode plates. Accordingly, a production line installed to manufacture positive electrode plates having different sizes may be reduced, and thus, manufacturing cost of a secondary battery having a step cell structure may be reduced.
  • first cathode body 120 ′ positioned at the top of the first electrode assembly 130 ′ and the second cathode body 150 ′ positioned at the bottom of the second electrode assembly 160 ′ are separated from each other. It may also be formed integrally.
  • the secondary batteries 100 and 200 having the step cell structure according to one or more embodiments of the present invention may have the second electrode assembly 160 and 160 ′. Is stacked on top of the first electrode assembly (130, 130 '), the second electrode assembly (160, 160') is to be placed at a predetermined position with respect to the first electrode assembly (130, 130 '). It may further include a positioning member 300 to enable.
  • FIGS. 13 and 14 illustrate that the positioning member 300 is applied to the secondary battery 100 having a step cell structure according to an embodiment of the present invention, but is not limited thereto. It may be applied to the secondary battery 200 having the step cell structure according to another embodiment of the present invention.
  • the positioning member 300 may be stacked on the upper side of the first electrode assembly 130 while forming a through hole 310 through which the second electrode assembly 160 may pass.
  • the overall shape of the positioning member 300 is preferably the same as that of the first electrode assembly 130. That is, the length and width directions of the positioning member 300 are preferably the same as the length and width directions of the first electrode assembly 130 as shown in FIG. 13.
  • the position of the positioning member 300 placed on the upper side of the first electrode assembly 130 must be constant and accurate so that the second electrode assembly 160 can be placed on the upper side of the first electrode assembly 130. This is because it can be laminated at a set position.
  • the positioning member 300 may not be the same as the outer shape of the first electrode assembly 130.
  • the position of the through hole 310 formed in the positioning member 300 may be changed according to the stacking position of the second electrode assembly 160 placed on the first electrode assembly 130.
  • the size of the through hole 310 is preferably the same as the size of the second electrode assembly 160. That is, the through hole 310 may be formed so that the second electrode assembly 160 does not move while the second electrode assembly 160 is seated inside the through hole 310.
  • the positioning member 300 may be made of an insulating film, tape or plastic synthetic resin material.
  • the positioning member 300 configured as described above is stacked above the first electrode assembly 130 to guide the stacking position of the second electrode assembly 160 stacked on the first electrode assembly 130. Since the second electrode assembly 160 may be stacked at a predetermined position with respect to the first electrode assembly 130, the operation may be easily and accurately performed.
  • the secondary batteries 100 and 200 having the step cell structure according to the embodiment of the present invention and the other embodiments can maximize the remaining space of the secondary battery storage space of the electronic device, the battery capacity and the battery use time are Can be increased.
  • the secondary batteries 100 and 200 having the step cell structure according to one embodiment and the other embodiment of the present invention do not limit the secondary battery storage space of the electronic device to the existing hexahedron shape, square shape or cylindrical shape, Electronic devices can be designed in various designs.
  • the present invention can be applied to a variety of electronic devices such as smartphones, cameras, notebooks, and can be sold to consumers or sold separately along with the electronic devices.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Secondary Cells (AREA)

Abstract

La présente invention concerne un accumulateur à structure d'éléments étagés et, plus particulièrement, un accumulateur à structure d'éléments étagés qui est conçu pour utiliser au maximum un espace de stockage à l'intérieur d'un dispositif électronique dans lequel est logé un accumulateur. Une pluralité d'ensembles électrodes de tailles différentes sont empilés sur plusieurs étages, et peuvent être logés dans un espace de stockage d'accumulateur d'un dispositif électronique comportant un espace de type surface incurvée se présentant sous la forme d'une courbe, ou dans un espace de stockage d'accumulateur d'un dispositif électronique présentant une partie asymétrique due à une différence de hauteur selon l'agencement des composants électroniques. Il est ainsi possible d'utiliser au maximum un espace de stockage d'accumulateur à l'intérieur d'un dispositif électronique. En outre, étant donné que l'espace restant de l'espace de stockage de l'accumulateur d'un dispositif électronique de la présente invention est utilisé à son maximum, il est possible d'augmenter la capacité et le temps d'utilisation d'un accumulateur.
PCT/KR2015/010150 2014-10-21 2015-09-25 Accumulateur à structure d'éléments étagés WO2016064100A1 (fr)

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KR10-2014-0142519 2014-10-21
KR1020140142519A KR101628892B1 (ko) 2014-10-21 2014-10-21 스텝 셀 구조를 가지는 이차전지

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US10826039B2 (en) 2016-08-12 2020-11-03 Lg Chem, Ltd. Electrode assembly including electrode and separator partially bonded to each other
KR102164003B1 (ko) * 2018-11-19 2020-10-12 삼성에스디아이 주식회사 전극 조립체 및 그의 제조 방법
KR102193741B1 (ko) * 2019-07-09 2020-12-21 주식회사 루트제이드 단위셀을 포함하는 전극조립체, 이의 제조 방법 및 이를 포함하는 리튬이차전지
KR20240054791A (ko) * 2022-10-19 2024-04-26 주식회사 엘지에너지솔루션 공정성이 개선된 전극 조립체 제조 방법 및 이를 사용하여 제조된 전극 조립체

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KR20160046523A (ko) 2016-04-29

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