WO2016064100A1 - Secondary battery having stepped cell structure - Google Patents

Secondary battery having stepped cell structure Download PDF

Info

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
Authority
WO
WIPO (PCT)
Prior art keywords
pocketing
electrode assembly
positive electrode
secondary battery
cell structure
Prior art date
Application number
PCT/KR2015/010150
Other languages
French (fr)
Korean (ko)
Inventor
김경준
김인중
정영호
최승호
Original Assignee
주식회사 루트제이드
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 주식회사 루트제이드 filed Critical 주식회사 루트제이드
Publication of WO2016064100A1 publication Critical patent/WO2016064100A1/en

Links

Images

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
    • H01M10/05—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.

Landscapes

  • 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

The present invention relates to a secondary battery having a stepped cell structure and, more particularly, to a secondary battery having a stepped cell structure, which is configured to maximally utilize a storage space inside an electronic device in which a secondary battery is accommodated. A plurality of electrode assemblies having different sizes are accumulated in multiple stages, and can be accommodated in a secondary battery storage space of an electronic device having a curved surface type space in the form of a curve, or in a secondary battery storage space of an electronic device having an uneven portion due to a height difference according to the arrangement of electronic components. Thus, it is possible to maximally utilize a secondary battery storage space inside an electronic device. Also, since the remaining space of the secondary battery storage space of an electronic device of the present invention is maximally utilized, it is possible to increase the capacity and usage time of a battery.

Description

스텝 셀 구조를 가지는 이차전지Secondary Battery with Step Cell Structure
본 발명은 스텝 셀 구조를 가지는 이차전지에 관한 것으로서, 구체적으로는 이차전지가 장착되거나 수용되는 전자기기 내의 수납공간을 최대한 활용할 수 있도록 구성된 스텝 셀 구조를 가지는 리튬이온 이차전지에 관한 것이다.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.
휴대전화, 캠코더, 노트북 컴퓨터 등의 휴대용 전자기기 시장이 확대되고 다양화됨에 따라 재충전이 가능한 전원공급용 이차 전지에 대한 수요도 확대되고 있다. 휴대용 전자기기의 소형화, 경량화, 고성능화 및 다기능화는 전력원으로 사용되는 이차 전지의 에너지 저장밀도의 계속적인 향상을 요구하고 있다. 따라서, 이를 충족하기 위한 다년간의 연구결과, 현재 리튬의 가역적인 삽입, 방출이 가능한 탄소음극과 리튬의 가역적인 삽입, 방출이 가능한 양극물질을 채용한 리튬이온 이차 전지가 등장하였다. As the market for portable electronic devices such as mobile phones, camcorders, and notebook computers expands and diversifies, demand for rechargeable rechargeable batteries is increasing. Miniaturization, weight reduction, high performance, and multifunctionality of portable electronic devices require continuous improvement of energy storage density of secondary batteries used as power sources. Accordingly, as a result of many years of research to satisfy this problem, a lithium ion secondary battery employing a carbon cathode capable of reversible insertion and release of lithium and a cathode material capable of reversible insertion and release of lithium has emerged.
이 리튬이온 이차 전지는, 기존의 니켈-카드뮴 및 니켈-수소와 같은 수용액계 이차 전지와 비교할 경우, 단위무게당 에너지 밀도 및 충방전 수명이 상대적으로 크기 때문에 최근 휴대용 전자기기의 새로운 에너지원으로 급속히 기존 전지를 대치하고 있다. 그러나, 휴대용 전자기기의 급속한 발전과 다변화에 따라 더 높은 에너지 밀도와 다양한 규격의 전지 선택에 대한 요구가 급증하고 있는 바, 현재 리튬이온 이차 전지는 이와 같은 요구를 충족시켜 주지는 못하고 있는 실정이다. 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. However, with the rapid development and diversification of portable electronic devices, the demand for higher energy density and battery selection of various standards has rapidly increased, and thus, lithium ion secondary batteries do not satisfy such demands at present.
특히, 전자기기의 급속한 박형화와 소형화는 얇은 두께의 박형 리튬이온 이차 전지에 대한 수요를 급속히 확대시키고 있는 반면, 기존의 원통형이나 각형 리튬이온 이차 전지의 조립방법을 그대로 채용하는 경우, 박형화에 따르는 부피당 에너지 밀도의 하락이 지나치게 큰 편이다. 따라서, 부피당 에너지 밀도가 높은 박형 리튬이온 이차 전지의 개발은 다양한 휴대용 전자기기의 소형화, 경량화, 박형화를 이룩하는 데 필수적이라고 판단된다.In particular, while the rapid thinning and miniaturization of electronic devices are rapidly expanding the demand for thinner, thinner lithium ion secondary batteries, if the conventional method of assembling the cylindrical or square lithium ion secondary batteries is adopted as it is, The drop in energy density is too large. Therefore, development of a thin lithium ion secondary battery having a high energy density per volume is considered essential for achieving miniaturization, weight reduction, and thickness reduction of various portable electronic devices.
따라서, 본 출원인은, 이러한 문제를 해결하기 위해 포켓팅된 전극체를 이용한 이차전지를 개발하였으며, 본 출원인에 의해 출원되어 등록된 한국등록특허 제10-1168651호 및 제10-0337707호에는 포켓팅된 전극체를 이용한 리튬이온 이차전지 및 제조기술이 개시되어 있다.Accordingly, 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.
상기 선행특허들은 위의 문제점을 어느 정도 해결하였으나, 포켓팅 전극체를 이용한 리튬이온 이차전지는, 코인(coin)형, 버튼(button)형 등의 편평형 또는 파우치 형태 등의 외장 케이스가 전형적인 형상으로 제조되는 것이 일반적이기 때문에, 이차전지가 사용되는 전자기기의 모양이나 형태가 바뀌면 전형적인 형상의 이차전지가 사용되지 못한다는 문제점은 여전히 남아 있다.Although the prior patents have solved the above problems to some extent, 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.
최근에 와서 전자기기의 디자인은 소비자의 선택기준에서 큰 비중을 차지하기 때문에, 근래에는 세련되고 미려한 형상의 곡면형 전자기기들이 많이 출시되고 있는 실정이다.Recently, since the design of electronic devices takes a large part in consumer's selection criteria, a lot of stylish and beautiful curved electronic devices have been released in recent years.
그러나, 기존의 이차전지가 상기 곡면형 전자기기나, 또는, 전자부품들에 의해 필연적으로 요철부 공간이 형성되는 전자기기에 수납될 경우, 전자기기 내의 이차전지 수납공간에 상기 이차전지가 채우지 못하는 잔여공간이 남아있게 된다.However, when a conventional secondary battery is accommodated in the curved electronic device, or an electronic device inevitably formed by the uneven part space by the electronic components, the secondary battery cannot fill the secondary battery storage space in the electronic device. Remaining space will remain.
이에 따라, 기존의 이차전지는, 상기 잔여공간을 효율적으로 활용하지 못하기 때문에, 전지용량이나 사용시간 면에서 곡면형 전자기기나 요철부 공간을 갖는 전자기기에 적용되어 사용되기에는 만족할 만한 수준에 이르지 못한다.Accordingly, 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
따라서, 본 출원인은, 상기 수납공간의 잔여공간을 효율적으로 활용하여 이차전지의 전지용량이나 사용시간을 늘릴 수 있고 이차전지가 사용되는 전자기기의 형태에 대한 제약을 줄 수 있는 형태와 구조를 가지도록 스텝 셀 구조(stepped cell structure)를 가지는 리튬이온 이차전지를 제안하고자 한다.Accordingly, 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.
본 발명은 상기와 같은 문제점을 해결하기 위하여, 전지의 성능을 저하시키지 않은 상태로 이차전지가 수납되는 전자기기의 수납공간을 최대한 활용하고, 또한, 상기 수납공간의 형상에 호환되어 사용될 수 있는, 스텝 셀 구조를 가지는 이차전지를 제공할 수 있다.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.
본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 리튬이온 이차전지는, 동일한 크기를 가지는 복수개의 제1 포켓팅 양극체와 제1음극체가 교대로 적층되는 제1전극조립체; 및 동일한 크기를 가지는 복수개의 제2 포켓팅 양극체와 제2음극체가 교대로 적층되며, 상기 제1전극조립체의 크기보다 작은 크기를 가지도록 형성되고 상기 제1전극조립체의 상측 또는 하측에 마련되는 제2전극조립체;를 포함하며, 상기 제1전극조립체는 상기 제2전극조립체 보다 크게 형성될 수 있다.According to one or more exemplary embodiments, 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.
상기 제1전극조립체의 최상단에는 상기 제1 포켓팅 양극체와 동일한 크기를 가지는 제3 포켓팅 양극체가 적층되고, 상기 제3 포켓팅 양극체의 양극판은 상기 제2 음극체의 음극판과 동일하거나 작게 형성되고, 상기 제1 포켓팅 양극체의 양극판 보다 작게 형성될 수 있다.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.
상기 제1 포켓팅 양극체와 상기 제2 포켓팅 양극체 및 상기 제3 포켓팅 양극체는, 양극 활물질인 리튬 또는 리튬 금속 복합 산화물의 코팅층 및 무지 돌출부를 가지는 양극판; 상기 무지 돌출부만을 노출시키면서 상기 양극판의 양면을 피복하는 한 쌍의 분리막; 및 상기 양극판의 전체 둘레 또는 둘레의 일부에서 상기 한 쌍의 분리막 사이에 위치하여 상기 한 쌍의 분리막에 접착되는 절연성 고분자 필름;을 포함할 수 있다.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.
상기 제1음극체 및 상기 제2음극체는, 리튬을 흡장, 방출할 수 있는 탄소질 음극 활물질 코팅층 및 무지 돌출부를 가지는 음극판을 포함할 수 있다.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.
상기 제1 포켓팅 양극체와 상기 제3 포켓팅 양극체의 상기 절연성 고분자 필름의 타발공간 형상은 서로 동일하게 형성될 수 있다.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.
상기 제3 포켓팅 양극체의 절연성 고분자 필름에 형성된 상기 타발공간의 크기 또는 면적은 상기 제1 포켓팅 양극체의 절연성 고분자 필름에 형성된 상기 타발공간의 크기 또는 면적과 동일하거나 작게 형성될 수 있다.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.
상기 제2음극체의 음극판의 가장자리 보다 상기 제3 포켓팅 양극체의 양극판의 가장자리가 안쪽에 있도록 형성되며, 상기 제1 포켓팅 양극체의 양극판의 가장자리 보다 상기 제3포켓팅 양극체의 양극판의 가장자리가 안쪽에 있도록 형성될 수 있다.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.
상기 제1포켓팅 양극체, 상기 제2포켓팅 양극체 및 상기 제3포켓팅 양극체에서 상기 양극판과 상기 절연성 고분자 필름 사이의 간격은 동일하게 형성될 수 있다.In the first pocketing anode body, the second pocketing anode body, and the third pocketing anode body, the distance between the cathode plate and the insulating polymer film may be equally formed.
상기 제1전극조립체의 상단 및 하단에는 상기 제1음극체가 각각 배치되고,상기 제2전극조립체의 상단 및 하단에는 상기 제2음극체가 각각 배치될 수 있다.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.
상기 제1전극조립체의 상단 및 하단에 배치되는 제1음극체와 상기 제2전극조립체의 상단 및 하단에 각각 배치되는 상기 제2음극체에는 리튬을 흡장, 방출할 수 있는 탄소질 음극 활물질 코팅층이 형성되며, 상기 음극 활물질 코팅층은, 상기 제1전극조립체의 상단에 배치되는 제1음극체의 밑면 및 상기 제1전극조립체의 하단에 배치되는 제1음극체의 윗면과, 상기 제2전극조립체의 상단에 배치되는 제2음극체의 밑면 및 상기 제2전극조립체의 하단에 배치되는 제2음극체의 윗면에 형성 될 수 있다.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.
상기 제1전극조립체의 상측 또는 하측에는 상기 제1전극조립체의 상측 또는 하측에 적층되는 상기 제2전극조립체의 적층위치를 안내하는 위치결정부재가 마련될 수 있다.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.
상기 위치결정부재에는 상기 제2전극조립체가 통과될 수 있는 통공이 될 수 있다.The positioning member may be a through hole through which the second electrode assembly may pass.
본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지는, 크기가 서로 상이한 복수개의 전극조립체가 다단으로 적층되어 커브 형상의 곡면형 공간을 가지는 전자기기의 이차전지 수납공간이나, 전자부품의 배열에 따른 높낮이에 의하여 요철부를 가지는 전자기기의 이차전지 수납공간에 수용될 수 있으므로, 전자기기 내의 이차전지 수납공간을 최대한 활용할 수 있다.A secondary battery having a step cell structure according to an embodiment of the present invention 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.
또한, 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지는, 전자기기의 이차전지 수납공간의 잔여공간을 최대한 활용할 수 있으므로, 전지용량 및 전지사용시간을 늘릴 수 있다.In addition, 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.
또한, 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지는, 전자기기의 이차전지 수납공간을 기존의 각형이나 원통형으로 한정하지 않기 때문에, 전자기기를 다양한 디자인으로 설계 가능하게 할 수 있다.In addition, since 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. .
도 1은 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지의 분리 사시도.1 is an exploded perspective view of a secondary battery having a step cell structure according to an embodiment of the present invention.
도 2는 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지의 결합 사시도.Figure 2 is a perspective view of a secondary battery having a step cell structure according to an embodiment of the present invention.
도 3은 도 2에 도시된 이차전지를 A-A' 방향으로 절단하여 화살표 방향에서 바라본 단면도. 3 is a cross-sectional view of the secondary battery illustrated in FIG. 2 viewed in the direction of arrow A-A '.
도 4는 본 발명의 일 실시예에 따른 제1 포켓팅 양극체의 평면도.4 is a plan view of a first pocketing anode according to an embodiment of the present invention.
도 5는 본 발명의 일 실시예에 따른 제3 포켓팅 양극체의 평면도.5 is a plan view of a third pocketing anode according to an embodiment of the present invention.
도 6은 본 발명의 일 실시예에 따른 제2 포켓팅 양극체의 평면도.6 is a plan view of a second pocketing anode according to an embodiment of the present invention.
도 7은 도 3에 도시된 제3 포켓팅 양극체에 제2음극체가 적층된 모습을 위에서 바라본 도면.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.
도 8은 도 3에 도시된 제3 포켓팅 양극체의 절연성 고분자 필름의 폭이 늘어난 상태를 보여주는 단면도.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.
도 9은 도 7에 도시된 제3 포켓팅 양극체의 평면도.FIG. 9 is a plan view of the third pocketing anode shown in FIG. 7; FIG.
도 10은 도 7에 도시된 제3 포켓팅 양극체에 제2음극체가 적층된 모습을 위에서 바라본 도면.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.
도 11은 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지가 곡면형상을 가지는 전자기기의 이차전지 수납공간에 삽입된 모습을 보여주는 참고도.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.
도 12는 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지의 단면도.12 is a cross-sectional view of a secondary battery having a step cell structure according to another embodiment of the present invention.
도 13은 본 발명의 실시예에 따른 위치결정부재에 의해 제2전극조립체를 제1전극조립체에 적층하는 모습을 보여주는 사시도.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.
도 14는 본 발명의 실시예에 따른 제2전극조립체가 위치결정부재에 의해 안내되어 제1전극조립체에 적층된 모습을 보여주는 단면도.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.
본 발명의 이점 및 특징, 그리고 그것들을 달성하는 방법은 첨부되는 도면과 함께 상세하게 후술되어 있는 실시예들을 참조하면 명확해질 것이다.Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings.
그러나, 본 발명은 이하에서 개시되는 실시예들에 한정되는 것이 아니라 서로 다른 다양한 형태로 구현될 것이며, 단지 본 실시예들은 본 발명의 개시가 완전하도록 하며, 본 발명이 속하는 기술분야에서 통상의 지식을 가진 자에게 발명의 범주를 완전하게 알려주기 위해 제공되는 것이며, 본 발명은 청구항의 범주에 의해 정의될 뿐이다.However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, only the present embodiments to make the disclosure of the present invention complete, and common knowledge in the art to which the present invention pertains. It is provided to fully inform the person having the scope of the invention, which is defined only by the scope of the claims.
참고로, 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)는 리튬이온 이차전지(Lithium Ion Secondary Battery)를 포함하되 리튬이온 이차전지에 국한되는 것은 아니다. 이하에서는 설명의 편의를 위해 본 발명의 실시예에 따른 이차전지(100)가 리튬이온 이차전지인 경우를 예로 들어 설명한다.For reference, 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. Hereinafter, for convenience of description, the case where the secondary battery 100 according to the embodiment of the present invention is a lithium ion secondary battery will be described as an example.
도 1 내지 도 3에 도시된 바와 같이, 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)는, 서로 상이한 크기를 가지는 복수개의 전극조립체가 상하방향 또는 다단으로 적층되는 구조 내지 형태를 가지며, 본 발명의 실시예에서는 서로 상이한 크기를 가지는 두 개의 전극조립체가 서로 상하로 적층되는 경우를 예로 들어 설명한다.1 to 3, the secondary battery 100 having a step cell structure according to an embodiment of the present invention includes a structure in which a plurality of electrode assemblies having different sizes are stacked in a vertical direction or in multiple stages. In the exemplary embodiment of the present invention, a case in which two electrode assemblies having different sizes are stacked on top of each other will be described as an example.
본 발명의 일 실시예에 따른 이차전지(100)는, 동일한 크기를 가지는 복수개의 제1 포켓팅 양극체(110)와 제1음극체(120)가 교대로 적층되는 제1전극조립체(130); 동일한 크기를 가지는 복수개의 제2 포켓팅 양극체(140)와 제2음극체(150)가 교대로 적층되며, 상기 제1전극조립체(130)의 크기보다 작은 크기를 가진 상태로 상기 제1전극조립체(130)의 상측에 마련되는 제2전극조립체(160); 및 상기 제1전극조립체(130)의 최상단에 적층되며, 상기 제1 포켓팅 양극체(110)와 동일한 크기를 가지는 제3 포켓팅 양극체(170);를 포함하고, 상기 제3 포켓팅 양극체(170)의 양극판(171)은 상기 제2음극체(150)의 음극판(151)과 동일하거나 작게 형성되고, 상기 제1 포켓팅 양극체(110)의 양극판(111) 보다는 작게 형성될 수 있다.The secondary battery 100 according to an embodiment of the present invention 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.
상기 제3 포켓팅 양극체(170)는 상기 제1전극조립체(130)와 상기 제2전극조립체(160)사이에 배치되며, 이에 따라, 상기 제3 포켓팅 양극체(170)와 접하는 상기 제1전극조립체(130)의 최상단과, 상기 제2전극조립체(160)의 최하단에는 당연히 제1음극체(120)와 제2음극체(150)가 각각 배치될 수 있다.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.
제1전극조립체(130)와 제2전극조립체(160) 중에서 상대적으로 작은 전극조립체(160)의 전기저항이 상대적으로 큰 전극조립체(130)의 전기저항 보다 작은 것이 바람직하다. 왜냐하면, 상대적으로 크기가 작은 전극조립체(160)가 먼저 퇴화하여 전지로서의 기능을 상실할 가능성이 큰데, 작은 전극조립체(160)의 전기저항을 작게 하여 전지로서의 기능유지 기간을 큰 전극조립체(130)와 비슷하게 유지할 수 있다.It is preferable that 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
상기 제1 포켓팅 양극체(110)와 제2 포켓팅 양극체(140) 및 제3 포켓팅 양극체(170)는, 도 4 내지 도 6에 도시된 바와 같이, 양극 활물질인 리튬 또는 리튬 금속 복합 산화물의 코팅층 및 무지 돌출부(111a, 141a, 171a)를 가지는 양극판(111, 141, 171); 상기 무지 돌출부(111a, 141a, 171a)만을 노출시키면서 상기 양극판(111, 141, 171)의 양면을 피복하는 한 쌍의 분리막(112, 142, 172); 및 상기 양극판(111, 141, 171)의 전체 둘레 또는 둘레의 일부에서 상기 한 쌍의 분리막(112, 142, 172) 사이에 위치하여 상기 한 쌍의 분리막(112, 142, 172)에 접착되는 절연성 고분자 필름(114, 144, 174)을 포함할 수 있다.As shown in FIGS. 4 to 6, 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; And 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).
상기 절연성 고분자 필름(114, 144, 174)은 폴리 올레핀 수지 필름, 폴리 에스테르 수지 필름, 폴리 스티렌 수지 필름, 폴리 이미드 필름, 폴리 아마이드 필름, 플로로 카본 수지 필름, 에비에스 필름, 폴리 아크릴계 필름, 아세탈 계 필름, 폴리 카보네이트 필름으로 구성된 군으로부터 선택된 어느 하나를 포함할 수 있다. 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.
또한, 절연성 고분자 필름(114, 144, 174)은 에틸렌비닐아세테이트, 에틸렌 에틸 아세테이트, 에틸렌 아크릴릭 애시드 계 화합물, 아이오노머계 화합물, 폴리 에틸렌, 폴리 비닐 아세테이트, 폴리 비닐 뷰티랄로 구성된 고온 용융형 접착물질군으로부터 선택된 어느 하나의 접착 성분을 포함하는 것이 바람직하다.In addition, 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.
상기 절연성 고분자 필름(114, 144, 174)의 타발공간(115, 145, 175)은, 상기 양극판(111, 141, 171)이 수납되는 공간이며, 상기 양극판(111, 141, 171)이 일정 간격을 가지고 수납될 수 있도록 상기 양극판(111, 141, 171)의 크기보다 크게 형성될 수 있다.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.
그리고, 상기 타발공간(115, 145, 175)은, 상기 양극판(111, 141, 171)의 둘레 또는 둘레의 일부를 포함할 수 있는 조건만 만족하면 다양한 형상으로 형성될 수 있다.In addition, 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.
참고로, 본 발명의 실시예에서는, 도 4 내지 도 6에 도시된 바와 같이, 상기 양극판(111, 141, 171)이 무지 돌출부(111a, 141a, 171a)를 가지는 직사각형의 형상으로 형성되며, 상기 절연선 고분자 필름(114, 144, 174)의 타발공간(115, 145, 175)은 상기 양극판(111, 141, 171)의 전체 둘레를 포함하는 형상으로 형성될 수 있다.For reference, in the embodiment of the present invention, as shown in FIGS. 4 to 6, 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.
그리고, 상기 제1 포켓팅 양극체(110)의 절연성 고분자 필름(114)과 상기 제2 포켓팅 양극체(140)의 절연성 고분자 필름(144) 및 상기 제3 포켓팅 양극체(170)의 절연성 고분자 필름(174)에 형성되는 타발공간(115, 145, 175)은 서로 동일한 형상을 가질 수 있다.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.
그리고, 도 4 및 도 5에 도시된 바와 같이, 상기 제3 포켓팅 양극체(170)의 절연성 고분자 필름(174)에 형성되는 타발공간(175) 면적은 상기 제1 포켓팅 양극체(110)의 절연성 고분자 필름(114)이 구획하는 타발공간(115) 면적과 동일하게 형성될 수 있다.4 and 5, 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.
상기 제3 포켓팅 양극체(170)의 양극판(171) 크기는 상기 제1 포켓팅 양극체(110)의 양극판(111) 크기보다 작기 때문에, 상기 제3 포켓팅 양극체(170)에 형성된 타발공간(175) 면적이 상기 제1 포켓팅 양극체(110)에 형성된 타발공간(115) 면적과 동일할 경우, 상기 제3 포켓팅 양극체(170)의 양극판(171)과 절연성 고분자 필름(174) 사이에 형성되는 간격(d1)은 상기 제1 포켓팅 양극체(110)의 양극판(111)과 절연성 고분자 필름(114) 사이에 형성되는 간격(d2) 보다 길거나 크게 형성될 수 있다.Since the size of the positive electrode plate 171 of the third pocketing anode body 170 is smaller than the size of the positive electrode plate 111 of the first pocketing anode body 110, the punching formed on the third pocketing anode body 170 is performed. When 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.
그리고, 상기 제3 포켓팅 양극체(170)의 타발공간(175) 면적 또는 크기가 상기 제1 포켓팅 양극체(110)의 타발공간(115) 면적 또는 크기와 동일할 경우에는, 상기 제3 포켓팅 양극체(170)에 사용되는 절연성 고분자 필름(174)과 상기 제1 포켓팅 양극체(110)에 사용되는 절연성 고분자 필름(114)은 서로 동일한 형상으로서 호환 가능하기 때문에, 상기 절연성 고분자 필름(114, 174)을 제조하는 과정에서 고분자 필름의 생산라인을 별도로 마련하지 않아도 되는 장점이 있다.When the area or the size of the punching space 175 of the third pocketing anode body 170 is the same as the area or the size of the punching space 115 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.
그러나, 상기 제 3 포켓팅 양극체(170)의 양극판(171)과 절연성 고분자 필름(174)의 간격(d1)에 의해 형성되는 공간은, 제1 포켓팅 양극체(110)의 양극판(111)과 절연성 고분자 필름(174)의 간격(d2)에 의해 형성되는 공간보다 크기 때문에, 상기 제3 포켓팅 양극체(170)의 양극판(171)과 절연성 고분자 필름(174)의 간격(d1)에 의해 형성되는 공간을 구획하는 한 쌍의 분리막(172)이 변형될 수 있고 이에 따라, 전지의 성능이 저하될 수 있다. 즉, 제3 포켓팅 양극체(170)의 경우 양극판(171)과 절연선 고분자 필름(174) 사이의 간격이 제1 포켓팅 양극체(110) 보다 크기 때문에 분리막(172)이 양극판(171) 또는 절연성 고분자 필름(174)에 의해서 지지되지 못하고 양극판(171)과 절연성 고분자 필름(174) 사이의 간격으로 분리막(172)이 쳐질 수도 있다.However, 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. That is, in the case of the third pocketing anode body 170, 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.
따라서, 도 8 및 도 9에 도시된 바와 같이, 상기 제3 포켓팅 양극체(170)의 절연성 고분자 필름(174)에 형성되는 타발공간(175) 면적 또는 크기를 상기 제1 포켓팅 양극체(110)의 절연성 고분자 필름(114)이 구획하는 타발공간(115) 면적 또는 크기보다 작게 형성하여 상기 제3 포켓팅 양극체(170)의 양극판(171)과 절연성 고분자 필름(174) 사이의 간격(d1) 또는 면적을 줄일 수도 있다.Therefore, as illustrated in FIGS. 8 and 9, 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.
그리고, 도 4 내지 도 6에 도시된 바와 같이, 상기 제3 포켓팅 양극체(170)의 무지 돌출부(171a)의 폭(d3)은 상기 제1 포켓팅 양극체(110) 및 제2 포켓팅 양극체(140)의 무지 돌출부(111a, 141a)의 폭(d4, d5)과 동일한 것이 바람직하다.4 to 6, 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.
또한, 상기 제3 포켓팅 양극체(170)의 양극판(171)에서 돌출된 무지 돌출부(171a)의 돌출길이(d6)는, 상기 제1 포켓팅 양극체(110)의 양극판(111)에서 돌출된 무지 돌출부(111a)의 돌출길이(d7)와 동일하거나 길고, 상기 제2 포켓팅 양극체(140)의 양극판(141)에서 돌출된 무지 돌출부(141a)의 돌출길이(d8)와 동일하거나 작을 수 있다.In addition, the protruding length d6 of the plain protrusion 171a protruding from the positive electrode plate 171 of the third pocketing positive electrode 170 protrudes from the positive electrode plate 111 of the first pocketing positive electrode 110. Is equal to or longer than the protruding length d7 of the plain protrusion 111a, and is equal to or smaller than the protruding length d8 of the plain protrusion 141a protruding from the positive electrode plate 141 of the second pocketing anode body 140. Can be.
이에 따라, 상기 제1 포켓팅 양극체(110)의 무지 돌출부(111a)와 상기 제2 포켓팅 양극체(140)의 무지 돌출부(141a) 및 상기 제3 포켓팅 양극체(170)의 무지 돌출부(171a)는, 도 1 및 도 2에 도시된 바와 같이, 서로 동일한 폭을 가진 상태로 정렬되어 적층될 수 있다.Accordingly, the plain protrusion 111a of the first pocketing anode body 110, the plain protrusion 141a of the second pocketing anode body 140, and the plain protrusion of the third pocketing anode body 170. 1 and 2, as illustrated in FIGS. 1 and 2, the 171a may be aligned and stacked in a state having the same width as each other.
그리고, 상기 제1음극체(120) 및 제2음극체(150)는, 리튬을 흡장, 방출할 수 있는 탄소질 음극 활물질 코팅층 및 무지 돌출부(121a, 151a, 도 1 및 도 2 참조)를 가지는 음극판(121, 151)을 포함할 수 있다.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.
상기 제1음극체(120)의 음극판(121)은 상기 제1 포켓팅 양극체(110)의 분리막(112)과 동일한 크기를 가지며, 이에 따라, 상기 음극판(121)의 테두리는 상기 제1 포켓팅 양극체(110)의 무지 돌출부(111a)를 제외한 나머지 부위의 테두리와 일치될 수 있다. 즉, 제1음극체(120)의 음극판(121)은 제1포켓팅 양극체(110)와 동일한 크기 및 모양을 가지도록 형성된다.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.
그리고, 상기 제1음극체(120)의 음극판(121)은, 상기 제1 포켓팅 양극체(110)의 양극판에(111)에서 방출하는 리튬이온을 안정적으로 흡장시키기 위해 상기 양극판(111)의 크기보다 크게 형성되는 것이 필수적이다.In addition, 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.
그리고, 상기 음극판(121)의 무지 돌출부(121a)는 상기 제1 포켓팅 양극체(110)의 무지 돌출부(111a) 및 상기 제3 포켓팅 양극체(170)의 무지 돌출부(171a)와 이격된 위치 또는 반대 위치 등 다른 위치에 형성되거나 배치될 수 있다.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.
상기 제2음극체(150)의 음극판(151)은 상기 제2 포켓팅 양극체(140)의 분리막(142)과 동일한 크기를 가지며, 이에 따라, 상기 음극판(151)의 테두리는 상기 제2 포켓팅 양극체(140)의 무지 돌출부(141a)를 제외한 나머지 부위의 테두리와 일치될 수 있다. 즉, 제2음극체(150)의 음극판(151)은 제2포켓팅 양극체(140)와 동일한 크기 및 모양을 가지도록 형성된다.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.
그리고, 상기 제2음극체(150)의 음극판(151)은 상기 제2 포켓팅 양극체(140)의 양극판(141)에서 방출하는 리튬이온을 안정적으로 흡장시키기 위해 상기 제2 포켓팅 양극체(140)의 양극판(141)의 크기보다 크게 형성되는 것이 필수적이다.In addition, 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.
또한, 상기 음극판(151)의 무지 돌출부(151a)는 상기 제2 포켓팅 양극체(140)의 무지 돌출부(141a)와 이격된 위치 또는 반대 위치에 배치되고, 상기 제1음극체(120)의 음극판(121) 무지 돌출부와 정렬되어 적층될 수 있다.In addition, 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.
또한, 상기 제2음극체(150)의 음극판(151)은, 전술한 바와 같이, 상기 제3 포켓팅 양극체(170)의 양극판(171) 크기와 동일하거나 크게 형성되는 것이 바람직하다.In addition, as described above, 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.
따라서, 도 7 및 도 10에 도시된 바와 같이, 상기 제1전극조립체(130)의 최상단에 위치되는 제3 포켓팅 양극체(170)에 상기 제2전극조립체(150)의 최하단에 위치되는 제2음극체(150)가 적층되면, 상기 제2음극체(150)의 음극판(151)이 상기 제3 포켓팅 양극체(170)의 양극판(171)의 전체 면적을 가리면서 상기 양극판(171)에서 방출하는 리튬이온을 안정적으로 흡장할 수 있다.Therefore, as illustrated in FIGS. 7 and 10, 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. When the two cathode bodies 150 are stacked, 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.
한편, 제3포켓팅 양극체(170)는 제1전극조립체(130)에 포함될 수도 있다.Meanwhile, the third pocketing anode body 170 may be included in the first electrode assembly 130.
상기와 같은 구성을 가지는 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)는, 도 11에 도시된 바와 같이, 크기가 서로 상이한 복수개의 전극조립체(130, 150)가 다단으로 상하에 적층되어 커브 형상의 곡면형 공간 또는 모양을 가지는 전자기기의 이차전지 수납공간(200)이나, 전자부품의 배열에 따른 높낮이에 의하여 요철부를 가지는 전자기기의 이차전지 수납공간에 수용될 수 있으므로, 전자기기 내의 이차전지 수납공간을 최대한 활용할 수 있다.In 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.
이하, 도 12를 참조하여 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(200)가 설명된다.Hereinafter, a secondary battery 200 having a step cell structure according to another embodiment of the present invention will be described with reference to FIG. 12.
도 12에 도시된 바와 같이, 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(200)는, 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)와 마찬가지로 제1전극조립체(130')와 제2전극조립체(160')를 포함할 수 있다.As shown in FIG. 12, 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.
다만, 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(200)는, 상기 제1전극조립체(130') 및 제2전극조립체(160')를 구성하는 복수개의 포켓팅 양극체(110', 140') 및 음극체(120', 150') 간의 배치관계가 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)와는 상이하며, 이 배치관계로 인하여 본 발명의 일 실시예에서 설명되었던 제3포켓팅 양극체(170)를 구비하지 않고도 서로 다른 크기를 갖는 전극조립체(130', 160')를 상하로 적층시킬 수 있다.However, 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.
즉, 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(200)는, 도 12에 도시된 바와 같이, 동일한 크기를 가지는 복수개의 제1포켓팅 양극체(110')와 제1음극체(120')가 교대로 적층되는 제1전극조립체(130'); 동일한 크기를 가지는 복수개의 제2 포켓팅 양극체(140')와 제2음극체(150')가 교대로 적층되며, 상기 제1전극조립체(130)의 크기보다 작은 크기를 가진 상태로 상기 제1전극조립체(130')의 상측 또는 하측에 마련되는 제2전극조립체(160')를 포함하며, 상기 제1전극조립체(130')와 상기 제2전극조립체(160')의 상단 및 하단에는 상기 제1음극체(120')와 상기 제2음극체(150')가 각각 배치되는 것을 더 포함할 수 있다.That is, 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. A first electrode assembly 130 'in which sieves 120' 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. And 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.
참고로, 상기 제1전극조립체(130') 및 제2전극조립체(160')는 본 발명의 일실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)의 제1전극조립체(130) 및 제2전극조립체(160)의 구성과 대부분 동일하므로 이하에서는 동일부분에 대한 구체적인 설명이 생략된다.For reference, 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.
상기 제1전극조립체(130')의 상단 및 하단에 배치되는 제1음극체(120')와 상기 제2전극조립체(160')의 상단 및 하단에 배치되는 제2음극체(150')에는 리튬을 흡장, 방출할 수 있는 탄소질 음극 활물질이 일면에만 도포되거나 코팅된다는 점이 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)의 제1전극조립체(130) 및 제2전극조립체(160)와 상이하다.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.
즉, 도 12에 도시된 바와 같이, 상기 제1전극조립체(130')의 최상단과 상기 제2전극조립체(160')의 최하단에는 동일한 극성을 가지는 상기 제1음극체(120')와 상기 제2음극체(150')가 각각 배치되며, 이에 따라, 상기 제1전극조립체(130')와 상기 제2전극조립체(160')의 적층과정에서 상기 제1전극조립체(130')의 최상단에 배치된 제1음극체(120')와 상기 제1전극조립체(130')의 최하단에 배치된 제2음극체(150')가 서로 접촉되기 때문에, 상기 제1음극체(120')와 상기 제2음극체(150')가 서로 접촉되는 면에는 음극 활물질이 도포되거나 코팅될 필요가 없다.That is, as shown in FIG. 12, 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.
아울러, 상기 제1전극조립체(130')의 최하단에 배치된 제1음극체(120')와 상기 제2전극조립체(160')의 최상단에 배치된 제2음극체(150')의 일면은 도시되지 않은 이차전지 케이싱과 접촉되기 때문에, 상기 이차전지 케이싱과 접촉되는 면에도 음극 활물질이 도포되거나 코팅될 필요가 없다.In addition, one surface of the 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.
따라서, 상기 제1전극조립체(130')의 상단에 배치되는 제1음극체(120')의 밑면 및 상기 제1전극조립체(130')의 하단에 배치되는 제1음극체(120')의 윗면에만 음극 활물질이 도포되거나 코팅되고, 또한, 상기 제2전극조립체(160')의 상단에 배치되는 제2음극체(120')의 밑면 및 상기 제2전극조립체(130')의 하단에 배치되는 제2음극체(120')의 윗면에만 음극 활물질이 도포되거나 코팅되므로, 상기 제1전극조립체(130')와 상기 제2전극조립체(160')를 제조하는 데 필요한 재료비용이 절감될 수 있다.Therefore, 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.
더욱이, 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(200)는, 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)와는 달리 상기 제3포켓팅 양극체(170)를 구비하지 않고도 상기 제1전극조립체(130')와 상기 제2전극조립체(160')를 적층시킬 수 있으므로, 상기 제1전극조립체(130')를 구성하는 제1포켓팅 양극체(110')의 양극판(111')들 크기를 동일하게 유지할 수 있고, 또한, 상기 제2전극조립체(160')를 구성하는 제2포켓팅 양극체(140')의 양극판(141')들 크기를 동일하게 유지할 수 있어서, 상기 제1전극조립체(130')를 구성하는 복수개의 양극판(111')들 또는 상기 제2전극조립체(160')를 구성하는 복수개의 양극판(141')들 크기와는 상이한 별도의 양극판을 제조할 필요가 없다. 이에 따라, 서로 다른 크기를 갖는 양극판을 제조하기 위하여 설치되는 생산라인이 줄어들어 결국 스텝 셀 구조를 가지는 이차전지의 제조비용이 절감될 수 있다.Furthermore, 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. And the same size, 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.
한편, 제1전극조립체(130')의 최상단에 위치하는 제1음극체(120')와 제2전극조립체(160')의 최하단에 위치하는 제2음극체(150')는 분리 형성될 뿐만 아니라 일체로 형성될 수도 있다.Meanwhile, the 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.
또한, 본 발명의 일 실시예 및 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100, 200)는, 도 13 및 도 14에 도시된 바와 같이, 상기 제2전극조립체(160, 160')가 상기 제1전극조립체(130, 130')의 상측에 적층될 시에, 상기 제2전극조립체(160, 160')가 상기 제1전극조립체(130, 130')에 대하여 기 설정된 위치에 놓여질 수 있도록 하는 위치결정부재(300)를 더 포함할 수 있다.In addition, as shown in FIGS. 13 and 14, 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.
참고로, 도 13 및 도 14에는 상기 위치결정부재(300)가 본 발명의 일 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100)에 적용되는 것으로 도시되어 있으나, 이에 한정되는 것은 아니고, 본 발명의 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(200)에 적용될 수도 있다.For reference, 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.
상기 위치결정부재(300)는, 상기 제2전극조립체(160)가 통과될 수 있는 통공(310)을 형성한 채로 상기 제1전극조립체(130)의 상측에 적층될 수 있다.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.
그리고, 상기 위치결정부재(300)의 전체적은 외형은 상기 제1전극조립체(130)의 외형과 동일한 것이 바람직하다. 즉, 상기 위치결정부재(300)의 길이방향 및 폭방향 길이는 도 13에 도시된 바와 같이, 상기 제1전극조립체(130)의 길이 및 폭방향 길이와 동일한 것이 바람직하다.In addition, 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.
왜냐하면, 상기 제1전극조립체(130)의 상측에 놓여지는 상기 위치결정부재(300)의 위치가 일정하고 정확해야 상기 제2전극조립체(160)를 상기 제1전극조립체(130)의 상측에서 기 설정된 위치에 적층할 수 있기 때문이다. 다만, 위치결정부재(300)가 제1전극조립체(130)의 외형과 동일하지 않아도 무방하다.This is because 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. However, the positioning member 300 may not be the same as the outer shape of the first electrode assembly 130.
그리고, 상기 위치결정부재(300)에 형성되는 통공(310)의 위치는 상기 제1전극조립체(130)에 놓여지는 상기 제2전극조립체(160)의 적층위치에 따라 변경될 수 있다. 통공(310)의 크기는 제2전극조립체(160)의 크기와 동일하게 형성되는 것이 바람직하다. 즉, 제2전극조립체(160)가 통공(310)의 내부에 안착된 상태에서 제2전극조립체(160)가 움직이지 않도록 통공(310)이 형성되는 것이 바람직하다.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.
한편, 상기 위치결정부재(300)는, 절연성 재질의 필름, 테이프 또는 플라스틱 합성수지 재질 등으로 제작될 수 있다.On the other hand, the positioning member 300 may be made of an insulating film, tape or plastic synthetic resin material.
이에 따라, 상기와 같이 구성된 위치결정부재(300)는 상기 제1전극조립체(130)의 상측에 적층되어 상기 제1전극조립체(130)에 적층되는 제2전극조립체(160)의 적층위치를 안내할 수 있으므로, 상기 제2전극조립체(160)가 상기 제1전극조립체(130)에 대하여 기 설정된 위치에 적층시키는 작업이 간편하고 정확하게 수행될 수 있다.Accordingly, 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.
또한, 본 발명의 일 실시예 및 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100, 200)는, 전자기기의 이차전지 수납공간의 잔여공간을 최대한 활용할 수 있으므로, 전지용량 및 전지사용시간을 늘릴 수 있다.In addition, since 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.
또한, 본 발명의 일 실시예 및 다른 실시예에 따른 스텝 셀 구조를 가지는 이차전지(100, 200)는, 전자기기의 이차전지 수납공간을 기존의 육면체모양, 각형이나 원통형으로 한정하지 않기 때문에, 전자기기를 다양한 디자인으로 설계 가능하게 할 수 있다.In addition, since 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.
지금까지 본 발명에 따른 구체적인 일 실시예에 관하여 설명하였으나, 본 발명의 범위에서 벗어나지 않는 한도 내에서는 여러 가지 변형이 가능함은 물론이다.One specific embodiment according to the present invention has been described so far, but various modifications are possible without departing from the scope of the present invention.
그러므로, 본 발명의 범위는 설명된 실시예에 국한되어 정해져서는 안되며, 후술하는 특허 청구의 범위뿐 아니라 이 특허 청구의 범위와 균등한 것들에 의해 정해져야 한다.Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by the equivalents of the claims.
본 발명은 스마트폰, 카메라, 노트북 등 다양한 전자기기에 적용될 수 있으며, 전자기기와 함께 소비자에게 판매되거나 별도로 판매될 수 있다.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.

Claims (12)

  1. 동일한 크기를 가지는 복수개의 제1 포켓팅 양극체와 제1음극체가 교대로 적층되는 제1전극조립체; 및A first electrode assembly in which a plurality of first pocketing anode bodies and first cathode bodies having the same size are alternately stacked; And
    동일한 크기를 가지는 복수개의 제2 포켓팅 양극체와 제2음극체가 교대로 적층되며, 상기 제1전극조립체의 크기보다 작은 크기를 가지도록 형성되고 상기 제1전극조립체의 상측 또는 하측에 마련되는 제2전극조립체;를 포함하며,A plurality of second pocketing anodes and a second cathode body having the same size, which are alternately stacked, and formed to have a size smaller than that of the first electrode assembly and provided on the upper side or the lower side of the first electrode assembly; It includes; two-electrode assembly,
    상기 제1전극조립체는 상기 제2전극조립체 보다 크게 형성된 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.The first electrode assembly is a secondary battery having a step cell structure, characterized in that formed larger than the second electrode assembly.
  2. 제 1 항에 있어서,The method of claim 1,
    상기 제1전극조립체의 최상단에는 상기 제1 포켓팅 양극체와 동일한 크기를 가지는 제3 포켓팅 양극체가 적층되고,A third pocketing anode body having the same size as the first pocketing anode body is stacked on the top end of the first electrode assembly,
    상기 제3 포켓팅 양극체의 양극판은 상기 제2 음극체의 음극판과 동일하거나 작게 형성되고, 상기 제1 포켓팅 양극체의 양극판 보다 작게 형성된 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.The secondary battery having a step cell structure, wherein the positive electrode plate of the third pocketing positive electrode body is formed the same as or smaller than the negative electrode plate of the second negative electrode body and smaller than the positive electrode plate of the first pocketing positive electrode body.
  3. 제 2 항에 있어서,The method of claim 2,
    상기 제1 포켓팅 양극체와 상기 제2 포켓팅 양극체 및 상기 제3 포켓팅 양극체는,The first pocketing anode body, the second pocketing anode body and the third pocketing anode body,
    양극 활물질인 리튬 또는 리튬 금속 복합 산화물의 코팅층 및 무지 돌출부를 가지는 양극판;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;
    상기 무지 돌출부만을 노출시키면서 상기 양극판의 양면을 피복하는 한 쌍의 분리막; 및A pair of separators covering both surfaces of the positive electrode plate while exposing only the plain protrusion; And
    상기 양극판의 전체 둘레 또는 둘레의 일부에서 상기 한 쌍의 분리막 사이에 위치하여 상기 한 쌍의 분리막에 접착되는 절연성 고분자 필름;을 포함하는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.And an insulating polymer film positioned between the pair of separators in the entire circumference or a portion of the circumference of the positive electrode plate and bonded to the pair of separators.
  4. 제 3 항에 있어서,The method of claim 3, wherein
    상기 제1음극체 및 상기 제2음극체는,The first cathode body and the second cathode body,
    리튬을 흡장, 방출할 수 있는 탄소질 음극 활물질 코팅층 및 무지 돌출부를 가지는 음극판을 포함하는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.A secondary battery having a step-cell structure, comprising a negative electrode plate having a carbonaceous negative electrode active material coating layer capable of occluding and releasing lithium and a plain protrusion.
  5. 제 3 항에 있어서,The method of claim 3, wherein
    상기 제1 포켓팅 양극체와 상기 제3 포켓팅 양극체의 상기 절연성 고분자 필름의 타발공간 형상은 서로 동일하게 형성되는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.Secondary battery having a step-cell structure, characterized in that the punching space shape of the insulating polymer film of the first pocketing positive electrode and the third pocketing positive electrode are formed to be the same.
  6. 제 3 항에 있어서,The method of claim 3, wherein
    상기 제3 포켓팅 양극체의 절연성 고분자 필름에 형성된 상기 타발공간의 크기 또는 면적은 상기 제1 포켓팅 양극체의 절연성 고분자 필름에 형성된 상기 타발공간의 크기 또는 면적과 동일하거나 작게 형성된 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.The size or area of the punching space formed in the insulating polymer film of the third pocketing anode body is characterized in that it is formed equal to or smaller than the size or area of the punching space formed in the insulating polymer film of the first pocketing anode body. Secondary battery having a step cell structure.
  7. 제 3 항에 있어서,The method of claim 3, wherein
    상기 제2음극체의 음극판의 가장자리 보다 상기 제3 포켓팅 양극체의 양극판의 가장자리가 안쪽에 있도록 형성되며,The edge of the positive plate of the third pocketing positive electrode is formed inward than the edge of the negative plate of the second negative electrode,
    상기 제1 포켓팅 양극체의 양극판의 가장자리 보다 상기 제3포켓팅 양극체의 양극판의 가장자리가 안쪽에 있도록 형성된 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.The secondary battery having a step cell structure, characterized in that the edge of the positive electrode plate of the third pocketing positive electrode is located inward than the edge of the positive electrode plate of the first pocketing positive electrode.
  8. 제 3 항에 있어서,The method of claim 3, wherein
    상기 제1포켓팅 양극체, 상기 제2포켓팅 양극체 및 상기 제3포켓팅 양극체에서 상기 양극판과 상기 절연성 고분자 필름 사이의 간격은 동일하게 형성된 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.In the first pocketing positive electrode, the second pocketing positive electrode and the third pocketing positive electrode, the secondary cell having a step cell structure, characterized in that the interval between the positive electrode plate and the insulating polymer film is formed equally.
  9. 제 1 항에 있어서,The method of claim 1,
    상기 제1전극조립체의 상단 및 하단에는 제1음극체가 각각 배치되고, 상기 제2전극조립체의 상단 및 하단에는 제2음극체가 각각 배치되는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.Secondary batteries having a step cell structure, characterized in that the first cathode body is disposed on the upper and lower ends of the first electrode assembly, respectively, and the second cathode body is disposed on the upper and lower ends of the second electrode assembly.
  10. 제 9 항에 있어서,The method of claim 9,
    상기 제1전극조립체의 상단 및 하단에 배치되는 제1음극체와 상기 제2전극조립체의 상단 및 하단에 각각 배치되는 상기 제2음극체에는 리튬을 흡장, 방출할 수 있는 탄소질 음극 활물질 코팅층이 형성되며,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. Formed,
    상기 음극 활물질 코팅층은, The negative electrode active material coating layer,
    상기 제1전극조립체의 상단에 배치되는 제1음극체의 밑면 및 상기 제1전극조립체의 하단에 배치되는 제1음극체의 윗면과,A bottom surface of the first cathode body disposed on the top of the first electrode assembly and an upper surface of the first cathode body disposed on the bottom of the first electrode assembly;
    상기 제2전극조립체의 상단에 배치되는 제2음극체의 밑면 및 상기 제2전극조립체의 하단에 배치되는 제2음극체의 윗면에 형성되는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.The secondary battery having a step cell structure, characterized in that formed on the bottom surface of the second cathode body disposed on the upper end of the second electrode assembly and the top surface of the second cathode body disposed on the bottom of the second electrode assembly.
  11. 제 1 항에 있어서,The method of claim 1,
    상기 제1전극조립체의 상측 또는 하측에는 상기 제1전극조립체의 상측 또는 하측에 적층되는 상기 제2전극조립체의 적층위치를 안내하는 위치결정부재가 마련되는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.Secondary battery having a step cell structure, characterized in that the positioning member for guiding the stacking position of the second electrode assembly stacked on the upper or lower side of the first electrode assembly is provided on the upper or lower side of the first electrode assembly. .
  12. 제 11 항에 있어서,The method of claim 11,
    상기 위치결정부재에는 상기 제2전극조립체가 통과될 수 있는 통공이 형성되는 것을 특징으로 하는 스텝 셀 구조를 가지는 이차전지.The secondary battery having a step cell structure, characterized in that the positioning member is formed with a through hole through which the second electrode assembly can pass.
PCT/KR2015/010150 2014-10-21 2015-09-25 Secondary battery having stepped cell structure WO2016064100A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2014-0142519 2014-10-21
KR1020140142519A KR101628892B1 (en) 2014-10-21 2014-10-21 Secondary battery having stepped cell structure

Publications (1)

Publication Number Publication Date
WO2016064100A1 true WO2016064100A1 (en) 2016-04-28

Family

ID=55761098

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2015/010150 WO2016064100A1 (en) 2014-10-21 2015-09-25 Secondary battery having stepped cell structure

Country Status (2)

Country Link
KR (1) KR101628892B1 (en)
WO (1) WO2016064100A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10826039B2 (en) 2016-08-12 2020-11-03 Lg Chem, Ltd. Electrode assembly including electrode and separator partially bonded to each other
KR102164003B1 (en) * 2018-11-19 2020-10-12 삼성에스디아이 주식회사 Electrode assembly and method of manufacturing the same
KR102193741B1 (en) * 2019-07-09 2020-12-21 주식회사 루트제이드 Electrode assembly comprising unit cells, method of manufacturing the same and lithium secondary battery comprising the same
KR20240054791A (en) * 2022-10-19 2024-04-26 주식회사 엘지에너지솔루션 Electrode assembly manufacturing method with improved processability and electrode assembly manufactured by using the same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010086415A (en) * 2000-09-25 2001-09-12 정근창 Pocketed electrode plate for use in lithium ion secondary battery, its manufacturing method and lithium ion secondary battery using the same
KR20110138719A (en) * 2010-06-21 2011-12-28 김영덕 Pocketed electrode plate, electrode assembly and lithium secondary battery using thereof
KR20140087966A (en) * 2012-12-28 2014-07-09 주식회사 엘지화학 Pouch Type Secondary Battery and Device Comprising the Same
KR20140101510A (en) * 2013-02-08 2014-08-20 주식회사 엘지화학 Stepwise Cell Assembly
KR20140113319A (en) * 2013-03-15 2014-09-24 주식회사 엘지화학 Electrode assembly, battery cell and device comprising the same

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010086415A (en) * 2000-09-25 2001-09-12 정근창 Pocketed electrode plate for use in lithium ion secondary battery, its manufacturing method and lithium ion secondary battery using the same
KR20110138719A (en) * 2010-06-21 2011-12-28 김영덕 Pocketed electrode plate, electrode assembly and lithium secondary battery using thereof
KR20140087966A (en) * 2012-12-28 2014-07-09 주식회사 엘지화학 Pouch Type Secondary Battery and Device Comprising the Same
KR20140101510A (en) * 2013-02-08 2014-08-20 주식회사 엘지화학 Stepwise Cell Assembly
KR20140113319A (en) * 2013-03-15 2014-09-24 주식회사 엘지화학 Electrode assembly, battery cell and device comprising the same

Also Published As

Publication number Publication date
KR20160046523A (en) 2016-04-29
KR101628892B1 (en) 2016-06-09

Similar Documents

Publication Publication Date Title
WO2017052041A1 (en) Battery module and battery pack comprising same
WO2013168980A1 (en) Battery pack having amorphous structure
WO2014137112A1 (en) Battery cell comprising stepped structure
WO2014081193A1 (en) Secondary battery module
WO2013069953A1 (en) Battery cell having a novel structure
WO2015080465A1 (en) Battery pack
WO2013100643A1 (en) Electrode assembly and secondary battery using same
WO2015186912A1 (en) Secondary battery frame and battery module comprising same
WO2015141920A1 (en) Battery cell having asymmetric and indented structure
WO2017061746A1 (en) Battery module
WO2016064100A1 (en) Secondary battery having stepped cell structure
WO2015005652A1 (en) Electrode assembly, and battery and device comprising same
WO2014137017A1 (en) Electrode assembly having rounded corners
WO2014042398A1 (en) Wrapping electrode body and method for manufacturing same
WO2014042397A2 (en) Wrapped electrode assembly and method for manufacturing same
WO2015122594A1 (en) Battery cell comprising wrinkle preventing member
WO2013151233A1 (en) Battery cell
WO2016056764A1 (en) Electrode assembly wound in both directions, and lithium secondary battery comprising same
WO2016204467A1 (en) Lithium ion secondary battery
WO2013065942A1 (en) Battery cell and battery module including the same
WO2014003361A1 (en) Easily assembled all-in-one secondary battery module
WO2022071759A1 (en) Secondary battery and device including same
WO2016068544A1 (en) Electrode assembly comprising bi-cells and full-cell, and secondary battery comprising same
WO2021075710A1 (en) Secondary battery and device comprising same
WO2020171376A1 (en) Unit cell and manufacturing method therefor

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15851872

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15851872

Country of ref document: EP

Kind code of ref document: A1