WO2014038891A1 - Secondary battery - Google Patents

Secondary battery Download PDF

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Publication number
WO2014038891A1
WO2014038891A1 PCT/KR2013/008079 KR2013008079W WO2014038891A1 WO 2014038891 A1 WO2014038891 A1 WO 2014038891A1 KR 2013008079 W KR2013008079 W KR 2013008079W WO 2014038891 A1 WO2014038891 A1 WO 2014038891A1
Authority
WO
WIPO (PCT)
Prior art keywords
inner sealing
sealing part
secondary battery
electrode assemblies
predetermined distance
Prior art date
Application number
PCT/KR2013/008079
Other languages
French (fr)
Korean (ko)
Inventor
공명철
Original Assignee
에스케이이노베이션 주식회사
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 에스케이이노베이션 주식회사 filed Critical 에스케이이노베이션 주식회사
Publication of WO2014038891A1 publication Critical patent/WO2014038891A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M10/02—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/124—Primary casings; Jackets or wrappings characterised by the material having a layered structure
    • 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
    • H01M50/183—Sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/55—Terminals characterised by the disposition of the terminals on the cells on the same side of the cell
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • H01M50/557—Plate-shaped terminals
    • 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

Definitions

  • the present invention relates to a secondary battery.
  • the battery pack is built in.
  • automobiles using motors such as hybrid vehicles (HVs) and electric vehicles (EVs) have been developed and produced, and these vehicles also have built-in battery packs capable of driving the motors.
  • the above-described battery pack is provided with at least one battery for outputting a predetermined level of voltage in order to drive an electric / storage device or a vehicle for a predetermined time.
  • battery packs adopt a secondary battery capable of charging / discharging in recent years.
  • Representative secondary batteries include lithium secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.
  • lithium secondary batteries have been researched and developed since the early 1970s, and in 1990, lithium ion batteries using carbon as a negative electrode instead of lithium metal were developed.
  • the lithium secondary battery has been used for more than 500 cycles and has a short charging time of 1 to 2 hours. It is characterized by the highest sales elongation among secondary batteries and a light weight of about 30 to 40% as compared to nickel-hydrogen batteries.
  • the lithium secondary battery has the highest unit cell voltage (3.0 to 3.7V) and excellent energy density among the existing secondary batteries, and may have characteristics optimized for mobile devices.
  • the lithium secondary battery is generally classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte.
  • a battery using a liquid electrolyte is called a lithium ion battery
  • a battery using a polymer electrolyte is called a lithium polymer battery.
  • the exterior material of the lithium secondary battery may be formed in various kinds, and typical types of exterior materials include cylindrical, prismatic, and pouches.
  • an electrode assembly including a cathode plate, a cathode plate, and a separator interposed therebetween is stacked or wound.
  • the secondary battery according to the prior art is provided with one electrode assembly (electrode group) in one exterior material.
  • one electrode assembly electrode group
  • the conventional technology since the conventional technology has only one electrode assembly (electrode group) inside one exterior material, there is a limit in increasing the production amount, and there is a problem in that there is a deviation between the produced secondary batteries.
  • Patent Document 1 KR2008-0070206 A
  • the present invention is to solve the above-described problems of the prior art, an aspect of the present invention is provided with a plurality of electrode assemblies in one outer material, the first inner sealing portion and the second spaced apart a predetermined distance between the adjacent electrode assembly An inner sealing part is formed to provide a secondary battery that can cut or fold between the first and second inner sealing parts.
  • a plurality of electrode assemblies including a positive electrode plate, a negative electrode plate, and a separator are accommodated therein, and a plurality of electrode assemblies are disposed therein, and the first electrode assembly is disposed between adjacent electrode assemblies to separate the plurality of electrode assemblies.
  • an exterior member having an inner sealing part and a second inner sealing part, wherein the first inner sealing part and the second inner sealing part are formed to be spaced apart from each other by the adjacent electrode assembly.
  • the first inner sealing portion and the second inner sealing portion spaced apart from each other by a predetermined distance between the adjacent electrode assemblies are folded.
  • the gap between the first inner sealing portion and the second inner sealing portion spaced a predetermined distance between the adjacent electrode assembly is cut.
  • the packaging material is a pouch.
  • the packaging material is formed by laminating in order of an adhesive layer, a metal layer, and an insulating layer.
  • the packaging material is heat-sealed to form the first inner sealing part and the second inner sealing part.
  • the electrode assembly is two, the first inner sealing portion and the second inner sealing portion is formed to be spaced apart a predetermined distance between the adjacent electrode assembly.
  • the electrode assembly is three, the first inner sealing portion and the second inner sealing portion so that a predetermined distance spaced between the adjacent electrode assembly of the three electrode assembly. Is formed.
  • the electrode assembly is four, and the first inner sealing portion and the second inner sealing portion so as to be spaced apart a predetermined distance between the adjacent electrode assembly of the four electrode assembly. Is formed.
  • the positive electrode tab is bonded to the positive electrode plate and protrudes to the outside of the packaging material and the negative electrode tab is bonded to the negative electrode plate and further protrudes to the outside of the packaging material.
  • the positive electrode tab and the negative electrode tab protrude to one side of the packaging material.
  • the positive electrode tab protrudes to one side of the packaging material
  • the negative electrode tab protrudes to the other side of the packaging material
  • a method of manufacturing a secondary battery includes (A) preparing a plurality of electrode assemblies and an exterior material including a positive electrode plate, a negative electrode plate, and a separator, and (B) accommodating a plurality of the electrode assemblies in the interior of the exterior material.
  • the method may include forming a first inner sealing part and a second inner sealing part between adjacent electrode assemblies to separate the plurality of electrode assemblies from the outer cover material, wherein the first inner sealing part and the second inner sealing part are formed. It is formed to be spaced apart a predetermined distance between the adjacent electrode assembly.
  • the packaging material is a pouch.
  • the packaging material is formed by laminating in order of an adhesive layer, a metal layer, and an insulating layer.
  • the outer material is heat-sealed to form the first inner sealing part and the second inner sealing part.
  • the electrode assembly in the step (A), is two, in the step (B), the first to be spaced apart a predetermined distance between the adjacent electrode assembly A 1st inner sealing part and the said 2nd inner sealing part are formed.
  • the electrode assembly in the step (A), is three, in the step (B), between the adjacent electrode assembly of the three electrode assembly.
  • the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance.
  • the electrode assembly in the step (A), is four, in the step (B), between the adjacent electrode assembly of the four electrode assembly.
  • the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance.
  • the method further includes a positive electrode tab bonded to the positive electrode plate and protruding to the outside of the packaging material, and a negative electrode tab bonded to the negative electrode plate and protruding to the outside of the packaging material.
  • the positive electrode tab and the negative electrode tab protrude to one side of the packaging material.
  • the positive electrode tab protrudes to one side of the packaging material
  • the negative electrode tab protrudes to the other side of the packaging material
  • a plurality of electrode assemblies are provided in one packaging material, and a first inner sealing part and a second inner sealing part spaced apart by a predetermined distance between adjacent electrode assemblies are formed to fold between the first and second inner sealing parts.
  • the secondary battery can be easily stacked.
  • by cutting the spaced apart between the first and second inner sealing portion it is possible to assemble a plurality of secondary batteries at one time, thereby increasing the productivity, there is an advantage that can reduce the deviation between the produced secondary battery.
  • 1 to 2 is a plan view of a secondary battery according to an embodiment of the present invention
  • FIGS. 1 and 2 are exploded perspective views of the secondary battery illustrated in FIGS. 1 and 2;
  • FIG. 5 is a perspective view of the electrode assembly shown in FIG.
  • 6 to 11 is a view showing a manufacturing method of a secondary battery according to an embodiment of the present invention in the process order, and
  • FIG. 12 to 19 are perspective views illustrating a process of folding or cutting a modified example of the secondary battery illustrated in FIG. 9.
  • FIG. 1 to 2 is a plan view of a secondary battery according to an embodiment of the present invention
  • Figures 3 to 4 is an exploded perspective view of the secondary battery shown in Figures 1 to 2
  • Figure 5 is an electrode assembly shown in Figure 1 Perspective view.
  • the secondary battery 100 includes a plurality of electrode assemblies 110 including a cathode plate 113, an anode plate 115, and a separator 117.
  • the outer material having a first inner sealing portion (135a) and the second inner sealing portion (135b) formed between the adjacent electrode assembly 110 to separate the plurality of electrode assembly (110) 130, and the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110.
  • the electrode assembly 110 includes a positive electrode plate 113, a negative electrode plate 115, and a separator 117.
  • the electrode assembly 110 may be a winding type in which the positive electrode plate 113, the negative electrode plate 115, and the separator 117 are wound in a jelly-roll, or may be a stacked type. have.
  • the electrode assembly 110 according to the present embodiment is illustrated in the drawing as a winding type, it may be a stacked type.
  • the positive electrode plate 113 is a slurry for the positive electrode to which the positive electrode active material is added to the positive electrode current collector
  • the negative electrode plate 115 is a negative electrode slurry to which the negative electrode active material is added to the negative electrode current collector
  • the separator 117 Is interposed between the positive electrode plate 113 and the negative electrode plate 115.
  • the positive electrode plate 113 stores / discharges electrons generated by the removal / insertion of lithium ions into the crystal structure, and becomes a source of lithium, which is a source of electrical energy.
  • the positive electrode plate 113 should have high energy density, stable crystal structure (to prevent change of the crystal structure during battery charging / discharging), and chemical stability (to be stable to high potential and organic electrolyte).
  • the positive electrode plate 113 should be reversible in the electrode reaction, and have a particle shape of a certain form to facilitate the manufacture.
  • the positive electrode active material of the positive electrode plate 113 includes lithium cobalt oxide (LiCoO 2 ), a lithium metal oxide (LiMO 2 ) having a layered structure such as a ternary structure, and lithium manganese oxide (LiMn). 2 O 4) it is olivine (olivine) based material (LiMPO 4), such as spinel-based material typified (LiM 2 O 4), or lithium iron phosphate (LiFePO 4) can be used as, but not limited to this.
  • the negative electrode plate 115 allows a current to flow in an external circuit while reversibly occlude / discharge lithium ions from the positive electrode plate 113. At this time, the negative electrode plate 115 should have a large lithium ion occlusion capacity, have a high charge and discharge efficiency and excellent reversibility, and needs to have a fast electrode chemical reaction rate.
  • the negative electrode active material of the negative electrode plate 115 may be a carbon (C) -based material, Si, Sn, tin oxide, composite tin alloys, or transition metal oxides. Or lithium metal oxide may be used, but is not limited thereto.
  • the separator 117 is a separator to prevent electrical short between the positive electrode plate 113 and the negative electrode plate 115, the microporous membrane of polyolefin resin such as polyethylene (PE) or polypropylene (PP) Can be used.
  • PE polyethylene
  • PP polypropylene
  • the positive electrode plate 113 may be provided with a positive electrode non-coating portion is not coated with a positive electrode slurry on the positive electrode current collector, and similar to the positive electrode plate 113, the negative electrode plate 115 is provided with a negative electrode non-coated portion is not coated with a negative electrode slurry Can be.
  • the positive electrode tab 120a and the negative electrode tab 120b of a predetermined length are respectively bonded to the positive electrode non-coating portion and the negative electrode non-coating portion by welding, and the positive electrode tab 120a and the negative electrode tab 120b are sealed in an outer packaging material 130. It may protrude outward. At this time, both the positive electrode tab 120a and the negative electrode tab 120b may protrude to one side of the exterior member 130 (see FIG.
  • the positive electrode tab 120a and the negative electrode tab 120b may protrude in one direction (same direction) of the exterior member 130.
  • the scope of the present invention is not necessarily limited thereto, and the positive electrode tab 120a may protrude to one side of the exterior member 130 and the negative electrode tab 120b may protrude to the other side of the exterior member 130 (FIG. 2). Reference). That is, the positive electrode tab 120a and the negative electrode tab 120b may protrude in both directions (counter directions) of the exterior member 130.
  • an insulating tape 125 may be provided on the positive electrode tab 120a and the negative electrode tab 120b.
  • the insulating tape 125 may extend the outside of the positive electrode tab 120a and the negative electrode tab 120b at a portion where the positive electrode tab 120a and the negative electrode tab 120b overlap with the outer sealing part 133 of the exterior member 130. It is formed to wrap. The insulating tape 125 may not only electrically insulate the positive electrode tab 120a and the negative electrode tab 120b from the exterior member 130, but also improve the sealing property of the exterior member 130 and prevent leakage.
  • the electrolyte may be charged into the exterior material 130 in a liquid state, the separator 117 may serve as an electrolyte. Alternatively, the electrolyte may be filled into the exterior material 130 in a liquid state, and then a polymerizable component may be added to finally make the electrolyte in a polymer state.
  • the secondary battery 100 is provided with a plurality of electrode assemblies 110 is accommodated in one of the exterior material 130, the details thereof will be described later.
  • the exterior material 130 serves to receive a plurality of electrode assemblies 110.
  • the exterior material 130 may be a pouch (Pouch) is made of aluminum, as shown in Figures 3 to 4, it may be formed in a substantially rectangular parallelepiped shape.
  • the exterior material 130 may include a container 131 in which the electrode assembly 110 is accommodated together with the electrolyte and a cover 132 covering the open top surface of the container 131.
  • the exterior member 130 has an outer side of the edge of the container 131 and the edge of the cover 132 in a state in which the positive electrode tab 120a and the negative electrode tab 120b of the electrode assembly 110 accommodated therein protrude to the outside.
  • the sealing part 133 may be formed and sealed.
  • the exterior member 130 may be sealed by forming a first inner sealing part 135a and a second inner sealing part 135b between adjacent electrode assemblies 110 to separate the plurality of electrode assemblies 110.
  • the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110.
  • the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110, between the first and second inner sealing parts 135a and 135b.
  • the non-sealing region 137 by cutting the non-sealing region 137, a plurality of secondary batteries 100 may be assembled at a time, thereby increasing productivity and reducing variations between the produced secondary batteries 100 (FIG. 11). Reference).
  • the sealed part such as the first and second inner sealing parts 135a and 135b, the unstretched polypropylene (CPP) or polypropylene (Polypropylene, PP), etc.
  • a crack may occur and a problem of lowering insulation resistance may occur.
  • the non-sealing region 137 provided between the first and second inner sealing parts 135a and 135b instead of the first and second inner sealing parts 135a and 135b.
  • 6 to 11 are views illustrating a method of manufacturing a secondary battery according to an embodiment of the present invention in the order of process.
  • the method of manufacturing the secondary battery 100 includes (A) a plurality of electrode assemblies including the positive electrode plate 113, the negative electrode plate 115, and the separator 117 ( (B) accommodating a plurality of electrode assemblies 110 in the interior of the exterior material 130, and adjacent electrodes to separate the plurality of electrode assemblies 110 from the exterior material 130. Forming a first inner sealing portion 135a and a second inner sealing portion 135b between the assembly 110, wherein the first inner sealing portion 135a and the second inner sealing portion 135b are adjacent to each other. It is formed to be spaced apart a predetermined distance between the electrode assembly 110.
  • the electrode assembly 110 may be a winding type (refer to FIG. 5) or a stacked type (stack type) in which the positive electrode plate 113, the negative electrode plate 115, and the separator 117 are wound.
  • the positive electrode tabs 120a and the negative electrode tabs 120b may be bonded to the positive electrode plate 113 and the negative electrode plate 115, respectively, and the positive electrode tab 120a and the negative electrode tab 120b may be finally sealed. It may protrude outward.
  • both the positive electrode tab 120a and the negative electrode tab 120b protrude to one side of the exterior member 130, but the positive electrode tab 120a protrudes to one side of the exterior member 130 and the negative electrode tab 120b is the exterior member 130. ) May protrude to the other side (see FIG. 4).
  • the exterior member 130 serves to accommodate a plurality of electrode assembly 110, it may be a pouch (Pouch).
  • the exterior material 130 may include a container 131 in which the electrode assembly 110 is accommodated together with the electrolyte and a cover 132 covering the open top surface of the container 131.
  • the outer sealing part 133 and the first and second inner sealing parts 135a and 135b are formed in the exterior member 130 to accommodate the plurality of electrode assemblies 110 in the exterior member 130.
  • the outer sealing part 133 is formed on the edge of the container 131 and the edge of the cover 132. Can be formed to seal.
  • the exterior member 130 may form and seal the first inner sealing part 135a and the second inner sealing part 135b between adjacent electrode assemblies 110 to separate the plurality of electrode assemblies 110.
  • the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110.
  • the exterior member 130 may include an adhesive layer 130a formed of unstretched polypropylene (CPP) or polypropylene (Polypropylene, PP), a metal layer formed of aluminum, or the like ( 130b) and the insulating layer 130c formed of polyethylene terephthalate (PET) resin or nylon resin.
  • the adhesive layer 130a serves to seal the exterior material 130 to each other to seal each other
  • the metal layer 130b serves to block air, gas or moisture
  • the insulating layer 130c has insulation property with the outside. It has a role to secure.
  • heat and pressure are applied by applying heat and pressure to the heating unit 140, a heating block or a heating jig.
  • the adhesive layer (130a) of the exterior material 130 is melted by the heat provided by the heating means 140 to increase the degree of freedom of flow, hardening through the cooling process, the outer sealing portion 133 and the first and second inner sealing
  • the portions 135a and 135b are formed. Meanwhile, as illustrated in FIG.
  • the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between two adjacent electrode assemblies 110. As such, since the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110, the first inner sealing part 135a and the second inner sealing part. There is an unsealed region 137 (unsealed region) between the 135b.
  • the secondary battery 100 may be folded or cut.
  • the non-sealing region 137 existing between the first inner sealing portion 135a and the second inner sealing portion 135b spaced a predetermined distance may be folded.
  • the non-sealing region 137 existing between the first inner sealing portion 135a and the second inner sealing portion 135b spaced a predetermined distance may be cut.
  • the two secondary batteries 100 can be assembled at a time, thereby increasing productivity and reducing the deviation between the produced secondary batteries.
  • the non-sealing region 137 provided between the first and second inner sealing parts 135a and 135b, not the first and second inner sealing parts 135a and 135b, may be folded or cut. This does not occur and the insulation resistance can be prevented from falling.
  • FIG. 9 illustrates that the two electrode assemblies 110 are accommodated in one exterior member 130, but the scope of the present invention is not limited thereto, and three or more interior components of one exterior member 130 are provided.
  • the electrode assembly 110 may be accommodated.
  • 12 to 19 are perspective views illustrating a process of folding or cutting a modified example of the secondary battery illustrated in FIG. 9. Referring to this, a configuration of accommodating three or more electrode assemblies 110 in one exterior member 130 is described. Let's take a look.
  • three electrode assemblies 110 may be provided in one exterior material 130 side by side in one direction.
  • the first inner sealing part 135a and the second inner sealing part may be provided.
  • the 135b may be formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110 among the three electrode assemblies 110.
  • two non-sealing regions 137 exist, and as illustrated in FIG. 13, the secondary battery 200 is three-layered by folding the zigzag based on the two non-sealing regions 137. Can be stacked.
  • FIG. 14 by cutting the two non-sealing regions 137, three secondary batteries 200 may be assembled at a time.
  • four electrode assemblies 110 may be provided in one exterior material 130 side by side in one direction.
  • the first inner sealing part 135a and the second inner sealing part 135b may be provided.
  • three non-sealing regions 137 exist, and as illustrated in FIG. 16, the secondary battery 300 is folded into four layers by folding the zigzag based on the three non-sealing regions 137. Can be stacked.
  • FIG. 17 by cutting three non-sealing regions 137, four secondary batteries 300 may be assembled at a time.
  • the plurality of electrode assemblies 110 are not necessarily provided side by side in one direction in one exterior material 130.
  • a total of four electrode assemblies 110 may be provided in one exterior material 130, two in one direction and another in the one direction (vertical to one direction).
  • two non-sealing regions 137 exist, and as illustrated in FIG. 19, four secondary batteries 400 may be assembled at a time by cutting two non-sealing regions 137.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The present invention relates to a secondary battery. The secondary battery (100), according to the present invention, comprises: a plurality of electrode assemblies (110) including cathode plates (113), anode plates (115), and separators (117); and a cladding (130) which accommodates the plurality of electrode assemblies (110) therein, and which has a first inner-side sealing unit (135a) and a second inner-side sealing unit (135b) between adjacent electrode assemblies (110) so as to separate the plurality of electrode assemblies (110), wherein the two of the first inner-side sealing unit (135a) and the second inner-side sealing unit (135b) are formed in order to be separated from each other at a predetermined distance between the adjacent electrode assemblies (110).

Description

이차전지Secondary battery
[관련출원의 상호참조][Cross References of Related Applications]
본 출원은 2012년 9월 6일 출원된 한국특허 출원번호 제10-2012-0098954호를 우선권 주장하고 있으며, 상기 특허 문헌의 내용은 참조를 위해 본 발명에 모두 포함된다This application claims priority to Korean Patent Application No. 10-2012-0098954, filed September 6, 2012, the contents of which are incorporated by reference in their entirety for reference.
본 발명은 이차전지에 관한 것이다.The present invention relates to a secondary battery.
최근, 휴대전화, 노트북 컴퓨터, 캠코더 등의 컴팩트(Compact)하고 경량화된 전기/전자장치들이 활발하게 개발 및 생산되고 있고, 이러한 전기/저장장치는 별도의 전원이 구비되지 않은 장소에서도 작동할 수 있도록 전지 팩을 내장하고 있다. 또한, 하이브리드 자동차(HV, Hybrid Vehicles), 전기 자동차(EV, Electric Vehicles) 등의 모터를 이용하는 자동차가 개발 및 생산되고 있고, 이러한 자동차에도 모터를 구동시킬 수 있는 전지 팩을 내장하고 있다. 상술한 전지 팩은 일정시간 동안 전기/저장장치 또는 자동차를 구동시키기 위해서 소정 레벨의 전압을 출력시킬 수 있도록 적어도 하나의 전지가 구비하고 있다.Recently, compact and lightweight electric / electronic devices such as mobile phones, notebook computers, and camcorders have been actively developed and produced, and such electric / storage devices can be operated in places where no separate power source is provided. The battery pack is built in. In addition, automobiles using motors such as hybrid vehicles (HVs) and electric vehicles (EVs) have been developed and produced, and these vehicles also have built-in battery packs capable of driving the motors. The above-described battery pack is provided with at least one battery for outputting a predetermined level of voltage in order to drive an electric / storage device or a vehicle for a predetermined time.
경제적을 측면을 고려하여, 최근 전지 팩은 충전/방전이 가능한 이차전지를 채용하고 있다. 이차전지는 대표적으로 니켈-카드뮴(Ni-Cd) 전지, 니켈-수소(Ni-MH) 전지 및 리튬(Li) 전지, 리튬 이온(Li-ion) 전지 등의 리튬 이차전지 등이 존재한다.In consideration of economical aspects, battery packs adopt a secondary battery capable of charging / discharging in recent years. Representative secondary batteries include lithium secondary batteries such as nickel-cadmium (Ni-Cd) batteries, nickel-hydrogen (Ni-MH) batteries, lithium (Li) batteries, and lithium ion (Li-ion) batteries.
이중, 리튬 이차전지는 1970년대 초부터 연구개발이 진행되었고, 1990년 리튬금속 대신 탄소를 음극으로 이용한 리튬 이온전지가 개발되면서 실용화되었으며, 500회 이상의 사이클 수명과 1 내지 2시간의 짧은 충전시간을 특징으로 하여 이차전지 중 가장 판매 신장률이 높고 니켈-수소 전지에 비해서 30 내지 40% 정도 가벼워 경량화가 가능하다. 또한, 리튬 이차전지는 현존하는 이차전지 중 단위전지 전압(3.0 내지 3.7V)이 가장 높고 에너지밀도가 우수하여, 이동기기에 최적화된 특성을 가질 수 있다.Among them, lithium secondary batteries have been researched and developed since the early 1970s, and in 1990, lithium ion batteries using carbon as a negative electrode instead of lithium metal were developed. The lithium secondary battery has been used for more than 500 cycles and has a short charging time of 1 to 2 hours. It is characterized by the highest sales elongation among secondary batteries and a light weight of about 30 to 40% as compared to nickel-hydrogen batteries. In addition, the lithium secondary battery has the highest unit cell voltage (3.0 to 3.7V) and excellent energy density among the existing secondary batteries, and may have characteristics optimized for mobile devices.
이러한 리튬 이차전지는 일반적으로 전해액의 종류에 따라 액체 전해질 전지와 고분자 전해질 전지로 분류되며, 액체 전해질을 사용하는 전지를 리튬 이온전지라 하고, 고분자 전해질을 사용하는 전지를 리튬 폴리머전지라 한다. 또한, 리튬 이차전지의 외장재는 여러가지 종류로 형성될 수 있고, 대표적인 외장재의 종류로는 원통형(Cylindrical), 각형(Prismatic), 파우치(Pouch) 등이 있다. 상기 리튬 이차전지의 외장재 내부에는 양극판, 음극판 및 그 사이에 개재되는 세퍼레이터(Separator)가 적층되거나 권취된 전극조립체가 구비된다.The lithium secondary battery is generally classified into a liquid electrolyte battery and a polymer electrolyte battery according to the type of electrolyte. A battery using a liquid electrolyte is called a lithium ion battery, and a battery using a polymer electrolyte is called a lithium polymer battery. In addition, the exterior material of the lithium secondary battery may be formed in various kinds, and typical types of exterior materials include cylindrical, prismatic, and pouches. In the exterior of the lithium secondary battery, an electrode assembly including a cathode plate, a cathode plate, and a separator interposed therebetween is stacked or wound.
그런데, 종래기술에 따른 이차전지는 하기 선행기술문헌의 특허문헌에 개시된 바와 같이, 하나의 외장재 내부에 하나의 전극조립체(전극군)가 구비된다. 이와 같이, 종래기술은 하나의 외장재 내부에 하나의 전극조립체(전극군)만 존재하므로, 생산량을 증가시키는데 한계가 있고, 생산한 이차전지 사이의 편차가 존재하는 문제점이 존재한다.By the way, the secondary battery according to the prior art, as disclosed in the patent document of the following prior art document, is provided with one electrode assembly (electrode group) in one exterior material. As described above, since the conventional technology has only one electrode assembly (electrode group) inside one exterior material, there is a limit in increasing the production amount, and there is a problem in that there is a deviation between the produced secondary batteries.
[선행기술문헌][Preceding technical literature]
[특허문헌][Patent Documents]
(특허문헌 1) KR2008-0070206 A (Patent Document 1) KR2008-0070206 A
본 발명은 상술한 종래기술의 문제점을 해결하기 위한 것으로, 본 발명의 일 측면은 하나의 외장재에 다수의 전극조립체를 구비하고, 인접한 전극조립체 사이에 소정거리 이격된 제1 내측 실링부와 제2 내측 실링부를 형성하여, 제1,2 내측 실링부 사이를 자르거나 접을 수 있는 이차전지를 제공하기 위한 것이다.The present invention is to solve the above-described problems of the prior art, an aspect of the present invention is provided with a plurality of electrode assemblies in one outer material, the first inner sealing portion and the second spaced apart a predetermined distance between the adjacent electrode assembly An inner sealing part is formed to provide a secondary battery that can cut or fold between the first and second inner sealing parts.
본 발명의 실시예에 따른 이차전지는 양극판, 음극판 및 세퍼레이터를 포함하는 다수의 전극조립체 및 다수의 상기 전극조립체를 내부에 수용하되, 다수의 상기 전극조립체가 분리되도록 인접한 상기 전극조립체 사이에 제1 내측 실링부와 제2 내측 실링부가 형성된 외장재를 포함하고, 상기 제1 내측 실링부와 상기 제2 내측 실링부는 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성된다.In the secondary battery according to the embodiment of the present invention, a plurality of electrode assemblies including a positive electrode plate, a negative electrode plate, and a separator are accommodated therein, and a plurality of electrode assemblies are disposed therein, and the first electrode assembly is disposed between adjacent electrode assemblies to separate the plurality of electrode assemblies. And an exterior member having an inner sealing part and a second inner sealing part, wherein the first inner sealing part and the second inner sealing part are formed to be spaced apart from each other by the adjacent electrode assembly.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이는 접힌다.In addition, in the secondary battery according to the embodiment of the present invention, the first inner sealing portion and the second inner sealing portion spaced apart from each other by a predetermined distance between the adjacent electrode assemblies are folded.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이는 잘린다.In addition, in the secondary battery according to the embodiment of the present invention, the gap between the first inner sealing portion and the second inner sealing portion spaced a predetermined distance between the adjacent electrode assembly is cut.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 외장재는 파우치이다.In addition, in the secondary battery according to an embodiment of the present invention, the packaging material is a pouch.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 외장재는 접착층, 금속층 및 절연층 순으로 적층되어 형성된다.In addition, in the secondary battery according to an embodiment of the present invention, the packaging material is formed by laminating in order of an adhesive layer, a metal layer, and an insulating layer.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 외장재는 열융착시켜 상기 제1 내측 실링부와 상기 제2 내측 실링부가 형성된다.In addition, in the secondary battery according to the embodiment of the present invention, the packaging material is heat-sealed to form the first inner sealing part and the second inner sealing part.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 전극조립체는 2개이고, 상기 제1 내측 실링부와 상기 제2 내측 실링부는 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성된다.In addition, in the secondary battery according to the embodiment of the present invention, the electrode assembly is two, the first inner sealing portion and the second inner sealing portion is formed to be spaced apart a predetermined distance between the adjacent electrode assembly.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 전극조립체는 3개이고, 상기 제1 내측 실링부와 상기 제2 내측 실링부는 3개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성된다.In addition, in the secondary battery according to the embodiment of the present invention, the electrode assembly is three, the first inner sealing portion and the second inner sealing portion so that a predetermined distance spaced between the adjacent electrode assembly of the three electrode assembly. Is formed.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 전극조립체는 4개이고, 상기 제1 내측 실링부와 상기 제2 내측 실링부는 4개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성된다.In addition, in the secondary battery according to the embodiment of the present invention, the electrode assembly is four, and the first inner sealing portion and the second inner sealing portion so as to be spaced apart a predetermined distance between the adjacent electrode assembly of the four electrode assembly. Is formed.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 양극판에 접합되어 상기 외장재의 외측으로 돌출된 양극탭 및 상기 음극판에 접합되어 상기 외장재의 외측으로 돌출된 음극탭을 더 포함한다.In addition, in the secondary battery according to the embodiment of the present invention, the positive electrode tab is bonded to the positive electrode plate and protrudes to the outside of the packaging material and the negative electrode tab is bonded to the negative electrode plate and further protrudes to the outside of the packaging material.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 양극탭과 상기 음극탭은 상기 외장재의 일측으로 돌출된다.In addition, in the secondary battery according to the embodiment of the present invention, the positive electrode tab and the negative electrode tab protrude to one side of the packaging material.
또한, 본 발명의 실시예에 따른 이차전지에 있어서, 상기 양극탭은 상기 외장재의 일측으로 돌출되고, 상기 음극탭은 상기 외장재의 타측으로 돌출된다.In addition, in the secondary battery according to the embodiment of the present invention, the positive electrode tab protrudes to one side of the packaging material, and the negative electrode tab protrudes to the other side of the packaging material.
본 발명의 실시예에 따른 이차전지의 제조방법은 (A) 양극판, 음극판 및 세퍼레이터를 포함하는 다수의 전극조립체와 외장재를 준비하는 단계 및 (B) 상기 외장재의 내부에 다수의 상기 전극조립체를 수용하되, 상기 외장재 중 다수의 상기 전극조립체를 분리하도록 인접한 상기 전극조립체 사이에 제1 내측 실링부와 제2 내측 실링부를 형성하는 단계를 포함하고, 상기 제1 내측 실링부와 상기 제2 내측 실링부는 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성된다.According to an embodiment of the present invention, a method of manufacturing a secondary battery includes (A) preparing a plurality of electrode assemblies and an exterior material including a positive electrode plate, a negative electrode plate, and a separator, and (B) accommodating a plurality of the electrode assemblies in the interior of the exterior material. The method may include forming a first inner sealing part and a second inner sealing part between adjacent electrode assemblies to separate the plurality of electrode assemblies from the outer cover material, wherein the first inner sealing part and the second inner sealing part are formed. It is formed to be spaced apart a predetermined distance between the adjacent electrode assembly.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 (B) 단계 이후에, 인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이를 접는 단계를 더 포함한다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, after the step (B), between the first inner sealing portion and the second inner sealing portion spaced a predetermined distance between the adjacent electrode assembly. It further comprises a folding step.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 (B) 단계 이후에, 인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이를 자르는 단계를 더 포함한다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, after the step (B), between the first inner sealing portion and the second inner sealing portion spaced a predetermined distance between the adjacent electrode assembly. It further includes a cutting step.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 외장재는 파우치이다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, the packaging material is a pouch.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 외장재는 접착층, 금속층 및 절연층 순으로 적층되어 형성된다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, the packaging material is formed by laminating in order of an adhesive layer, a metal layer, and an insulating layer.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 (B) 단계에서, 상기 외장재를 열융착시켜 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성한다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, in the step (B), the outer material is heat-sealed to form the first inner sealing part and the second inner sealing part.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 (A) 단계에서, 상기 전극조립체는 2개이고, 상기 (B) 단계에서, 인접한 상기 전극조립체 사이에 소정거리 이격되도록 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성한다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, in the step (A), the electrode assembly is two, in the step (B), the first to be spaced apart a predetermined distance between the adjacent electrode assembly A 1st inner sealing part and the said 2nd inner sealing part are formed.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 (A) 단계에서, 상기 전극조립체는 3개이고, 상기 (B) 단계에서, 3개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성한다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, in the step (A), the electrode assembly is three, in the step (B), between the adjacent electrode assembly of the three electrode assembly. The first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 (A) 단계에서, 상기 전극조립체는 4개이고, 상기 (B) 단계에서, 4개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성한다.In the method of manufacturing a secondary battery according to an embodiment of the present invention, in the step (A), the electrode assembly is four, in the step (B), between the adjacent electrode assembly of the four electrode assembly. The first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 양극판에 접합되어 상기 외장재의 외측으로 돌출된 양극탭 및 상기 음극판에 접합되어 상기 외장재의 외측으로 돌출된 음극탭을 더 포함한다.Further, in the method of manufacturing a secondary battery according to an embodiment of the present invention, the method further includes a positive electrode tab bonded to the positive electrode plate and protruding to the outside of the packaging material, and a negative electrode tab bonded to the negative electrode plate and protruding to the outside of the packaging material. .
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 양극탭과 상기 음극탭은 상기 외장재의 일측으로 돌출된다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, the positive electrode tab and the negative electrode tab protrude to one side of the packaging material.
또한, 본 발명의 실시예에 따른 이차전지의 제조방법에 있어서, 상기 양극탭은 상기 외장재의 일측으로 돌출되고, 상기 음극탭은 상기 외장재의 타측으로 돌출된다.In addition, in the method of manufacturing a secondary battery according to an embodiment of the present invention, the positive electrode tab protrudes to one side of the packaging material, and the negative electrode tab protrudes to the other side of the packaging material.
본 발명의 특징 및 이점들은 첨부도면에 의거한 다음의 상세한 설명으로 더욱 명백해질 것이다.The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.
이에 앞서 본 명세서 및 청구범위에 사용된 용어나 단어는 통상적이고 사전적인 의미로 해석되어서는 아니되며, 발명자가 그 자신의 발명을 가장 최선의 방법으로 설명하기 위해 용어의 개념을 적절하게 정의할 수 있다는 원칙에 입각하여 본 발명의 기술적 사상에 부합되는 의미와 개념으로 해석되어야만 한다. Prior to this, the terms or words used in this specification and claims are not to be interpreted in a conventional and dictionary sense, and the inventors may appropriately define the concept of terms in order to best describe their own invention. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention based on the principle that the present invention.
본 발명에 따르면, 하나의 외장재에 다수의 전극조립체를 구비하고, 인접한 전극조립체 사이에 소정거리 이격된 제1 내측 실링부와 제2 내측 실링부를 형성하여, 제1,2 내측 실링부 사이를 접음으로써, 이차전지를 용이하게 스택킹(Stacking)할 수 있는 효과가 있다. 또한, 이격된 제1,2 내측 실링부 사이를 자름으로써, 다수의 이차전지를 한번에 조립할 수 있고 그에 따라 생산성이 뛰어나고, 생산한 이차전지 사이의 편차를 줄일 수 있는 장점이 있다.According to the present invention, a plurality of electrode assemblies are provided in one packaging material, and a first inner sealing part and a second inner sealing part spaced apart by a predetermined distance between adjacent electrode assemblies are formed to fold between the first and second inner sealing parts. As a result, the secondary battery can be easily stacked. In addition, by cutting the spaced apart between the first and second inner sealing portion, it is possible to assemble a plurality of secondary batteries at one time, thereby increasing the productivity, there is an advantage that can reduce the deviation between the produced secondary battery.
도 1 내지 도 2는 본 발명의 실시예에 따른 이차전지의 평면도,1 to 2 is a plan view of a secondary battery according to an embodiment of the present invention,
도 3 내지 도 4는 도 1 내지 도 2에 도시된 이차전지의 분해사시도,3 to 4 are exploded perspective views of the secondary battery illustrated in FIGS. 1 and 2;
도 5는 도 1에 도시된 전극조립체의 사시도,5 is a perspective view of the electrode assembly shown in FIG.
도 6 내지 도 11는 본 발명의 실시예에 따른 이차전지의 제조방법을 공정순서대로 도시한 도면, 및6 to 11 is a view showing a manufacturing method of a secondary battery according to an embodiment of the present invention in the process order, and
도 12 내지 도 19는 도 9에 도시된 이차전지의 변형예가 접히거나 잘리는 과정을 도시한 사시도이다.12 to 19 are perspective views illustrating a process of folding or cutting a modified example of the secondary battery illustrated in FIG. 9.
본 발명의 목적, 특정한 장점들 및 신규한 특징들은 첨부된 도면들과 연관되어지는 이하의 상세한 설명과 바람직한 실시예들로부터 더욱 명백해질 것이다. 본 명세서에서 각 도면의 구성요소들에 참조번호를 부가함에 있어서, 동일한 구성 요소들에 한해서는 비록 다른 도면상에 표시되더라도 가능한 한 동일한 번호를 가지도록 하고 있음에 유의하여야 한다. 또한, "제1", "제2" 등의 용어는 하나의 구성요소를 다른 구성요소로부터 구별하기 위해 사용되는 것으로, 구성요소가 상기 용어들에 의해 제한되는 것은 아니다. 이하, 본 발명을 설명함에 있어서, 본 발명의 요지를 불필요하게 흐릴 수 있는 관련된 공지 기술에 대한 상세한 설명은 생략한다.The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and the preferred embodiments associated with the accompanying drawings. In the present specification, in adding reference numerals to the components of each drawing, it should be noted that the same components as possible, even if displayed on different drawings have the same number as possible. In addition, terms such as “first” and “second” are used to distinguish one component from another component, and the component is not limited by the terms. In the following description, detailed descriptions of related well-known techniques that may unnecessarily obscure the subject matter of the present invention will be omitted.
이하, 첨부된 도면을 참조하여 본 발명의 바람직한 실시형태를 상세히 설명하기로 한다.Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
도 1 내지 도 2는 본 발명의 실시예에 따른 이차전지의 평면도이고, 도 3 내지 도 4는 도 1 내지 도 2에 도시된 이차전지의 분해사시도이며, 도 5는 도 1에 도시된 전극조립체의 사시도이다.1 to 2 is a plan view of a secondary battery according to an embodiment of the present invention, Figures 3 to 4 is an exploded perspective view of the secondary battery shown in Figures 1 to 2, Figure 5 is an electrode assembly shown in Figure 1 Perspective view.
도 1 내지 도 4에 도시된 바와 같이, 본 실시예에 따른 이차전지(100)는 양극판(113), 음극판(115) 및 세퍼레이터(117, Separator)를 포함하는 다수의 전극조립체(110), 다수의 전극조립체(110)를 내부에 수용하되, 다수의 전극조립체(110)가 분리되도록 인접한 전극조립체(110) 사이에 제1 내측 실링부(135a)와 제2 내측 실링부(135b)가 형성된 외장재(130)를 포함하고, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성된다.As shown in FIGS. 1 to 4, the secondary battery 100 according to the present embodiment includes a plurality of electrode assemblies 110 including a cathode plate 113, an anode plate 115, and a separator 117. To accommodate the electrode assembly 110 of the inside, the outer material having a first inner sealing portion (135a) and the second inner sealing portion (135b) formed between the adjacent electrode assembly 110 to separate the plurality of electrode assembly (110) 130, and the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110.
상기 전극조립체(110)는 도 5에 도시된 바와 같이 양극판(113), 음극판(115) 및 세퍼레이터(117)를 포함한다. 여기서, 전극조립체(110)는 양극판(113)과 음극판(115) 및 세퍼레이터(117)가 젤리-롤(Jelly-Roll)로 권취된 타입(Winding Type)이거나, 적층된 타입(Stack Type)일 수 있다. 본 실시예에 따른 전극조립체(110)는 권취된 타입(Winding Type)으로 도면에 도시되었으나, 적층된 타입(Stack Type)일 수도 있음은 물론이다. 구체적으로, 양극판(113)은 양극 집전체에 양극 활물질이 첨가된 양극용 슬러리가 도포된 것이고, 음극판(115)은 음극 집전체에 음극 활물질이 첨가된 음극용 슬러리가 도포된 것이며, 세퍼레이터(117)는 양극판(113)과 음극판(115)의 사이에 개재된 것이다. 여기서, 양극판(113)은 결정구조 내에 리튬 이온의 탈/삽입에 의해서 발생되는 전자를 저장/배출하고, 전기에너지의 원천인 리튬의 원천(Source)이 된다. 상기 양극판(113)은 높은 에너지밀도, 안정적인 결정구조(전지 충/방전시 결정구조의 변화 방지를 위함), 화학적 안정성(높은 전위 및 유기 전해액에 대해 안정적이기 위함)을 가져야 한다. 또한, 양극판(113)은 전극반응이 가역적이어야 하며, 제조가 용이하도록 일정형태의 입자상을 가져야 한다. 이러한 양극판(113)의 특성을 고려할 때, 양극판(113)의 양극 활물질로는 코발트산리튬(LiCoO2), 3원계 등의 층상계 구조의 리튬금속산화물(LiMO2)을 비롯하여 리튬망간산화물(LiMn2O4)로 대표되는 스피넬계 재료(LiM2O4), 또는 인산철리튬(LiFePO4) 같은 올리빈(Olivine)계 재료(LiMPO4)가 이용될 수 있지만, 이에 한정되는 것은 아니다. 또한, 양극판(113)의 양극 집전체로는 알루미늄이 이용될 수 있다. 한편, 음극판(115)은 양극판(113)에서 나온 리튬 이온을 가역적으로 흡장/방출하면서 외부회로에 전류를 흐르게 한다. 이때, 음극판(115)은 리튬 이온 흡장 능력이 커야하고, 높은 충방전 효율과 우수한 가역성을 가져야 하며, 전극화학반응 속도가 빠를 필요성이 있다. 이러한 음극판(115)의 특성을 고려할 때, 음극판(115)의 음극 활물질로는 탄소(C) 계열 물질, Si, Sn, 틴 옥사이드(Tin Oxide), 틴 합금 복합체(Composite Tin Alloys), 전이 금속 산화물 또는 리튬 금속 산화물 등이 이용될 수 있지만, 이에 한정되는 것은 아니다. 또한, 음극판(115)의 음극 집전체로는 구리 또는 니켈이 이용될 수 있다. 한편, 세퍼레이터(117)는 양극판(113)과 음극판(115) 사이에 전기적 단락을 방지하는 격리막으로, 폴리에틸렌(PE) 또는 폴리프로필렌(PP) 등의 폴리오레핀계(Polyolefin) 수지의 미세다공막이 이용될 수 있다.As shown in FIG. 5, the electrode assembly 110 includes a positive electrode plate 113, a negative electrode plate 115, and a separator 117. Here, the electrode assembly 110 may be a winding type in which the positive electrode plate 113, the negative electrode plate 115, and the separator 117 are wound in a jelly-roll, or may be a stacked type. have. Although the electrode assembly 110 according to the present embodiment is illustrated in the drawing as a winding type, it may be a stacked type. Specifically, the positive electrode plate 113 is a slurry for the positive electrode to which the positive electrode active material is added to the positive electrode current collector, the negative electrode plate 115 is a negative electrode slurry to which the negative electrode active material is added to the negative electrode current collector, and the separator 117 ) Is interposed between the positive electrode plate 113 and the negative electrode plate 115. Here, the positive electrode plate 113 stores / discharges electrons generated by the removal / insertion of lithium ions into the crystal structure, and becomes a source of lithium, which is a source of electrical energy. The positive electrode plate 113 should have high energy density, stable crystal structure (to prevent change of the crystal structure during battery charging / discharging), and chemical stability (to be stable to high potential and organic electrolyte). In addition, the positive electrode plate 113 should be reversible in the electrode reaction, and have a particle shape of a certain form to facilitate the manufacture. In consideration of the characteristics of the positive electrode plate 113, the positive electrode active material of the positive electrode plate 113 includes lithium cobalt oxide (LiCoO 2 ), a lithium metal oxide (LiMO 2 ) having a layered structure such as a ternary structure, and lithium manganese oxide (LiMn). 2 O 4) it is olivine (olivine) based material (LiMPO 4), such as spinel-based material typified (LiM 2 O 4), or lithium iron phosphate (LiFePO 4) can be used as, but not limited to this. In addition, aluminum may be used as the positive electrode current collector of the positive electrode plate 113. On the other hand, the negative electrode plate 115 allows a current to flow in an external circuit while reversibly occlude / discharge lithium ions from the positive electrode plate 113. At this time, the negative electrode plate 115 should have a large lithium ion occlusion capacity, have a high charge and discharge efficiency and excellent reversibility, and needs to have a fast electrode chemical reaction rate. In consideration of the characteristics of the negative electrode plate 115, the negative electrode active material of the negative electrode plate 115 may be a carbon (C) -based material, Si, Sn, tin oxide, composite tin alloys, or transition metal oxides. Or lithium metal oxide may be used, but is not limited thereto. In addition, copper or nickel may be used as the negative electrode current collector of the negative electrode plate 115. On the other hand, the separator 117 is a separator to prevent electrical short between the positive electrode plate 113 and the negative electrode plate 115, the microporous membrane of polyolefin resin such as polyethylene (PE) or polypropylene (PP) Can be used.
또한, 양극판(113)은 양극 집전체에 양극용 슬러리가 도포되지 않은 양극 무지부가 구비될 수 있고, 양극판(113)과 유사하게, 음극판(115)은 음극용 슬러리가 도포되지 않은 음극 무지부가 구비될 수 있다. 상술한 양극 무지부와 음극 무지부에는 각각 소정 길이의 양극탭(120a)과 음극탭(120b)이 용접 등으로 접합되며, 양극탭(120a)과 음극탭(120b)은 밀봉된 외장재(130)의 외측으로 돌출될 수 있다. 이때, 양극탭(120a)과 음극탭(120b)은 모두 외장재(130)의 일측으로 돌출될 수 있다(도 1 참조). 즉, 양극탭(120a)과 음극탭(120b)은 외장재(130)의 단방향(동일방향)으로 돌출될 수 있는 것이다. 다만, 본 발명의 권리범위는 반드시 이에 한정되는 것은 아니고, 양극탭(120a)은 외장재(130)의 일측으로 돌출되고 음극탭(120b)은 외장재(130)의 타측으로 돌출될 수 있다(도 2 참조). 즉, 양극탭(120a)과 음극탭(120b)은 외장재(130)의 양방향(반대방향)으로 돌출될 수도 있는 것이다. 추가적으로, 양극탭(120a)과 음극탭(120b)에는 절연 테이프(125)가 구비될 수 있다. 여기서, 절연 테이프(125)는 양극탭(120a) 및 음극탭(120b)이 외장재(130)의 외측 실링부(133)와 겹쳐지는 부분에서 양극탭(120a)과 음극탭(120b)의 외측을 감싸도록 형성된다. 절연 테이프(125)는 양극탭(120a)과 음극탭(120b)을 외장재(130)와 전기적으로 절연시킬 뿐만 아니라, 외장재(130)의 밀봉성을 향상시키고 누액을 방지할 수 있다. 한편, 본 실시예에 따른 이차전지(100)는 전지의 종류에 따라, 전해질이 액체 상태로 외장재(130) 내부에 충전될 수 있고, 세퍼레이터(117)가 전해질의 역할을 할 수도 있다. 또는, 전해질을 액체 상태로 외장재(130) 내부에 충전한 다음 폴리머화될 수 있는 성분을 첨가하여 최종적으로 폴리머 상태의 전해질이 되도록 할 수도 있다.In addition, the positive electrode plate 113 may be provided with a positive electrode non-coating portion is not coated with a positive electrode slurry on the positive electrode current collector, and similar to the positive electrode plate 113, the negative electrode plate 115 is provided with a negative electrode non-coated portion is not coated with a negative electrode slurry Can be. The positive electrode tab 120a and the negative electrode tab 120b of a predetermined length are respectively bonded to the positive electrode non-coating portion and the negative electrode non-coating portion by welding, and the positive electrode tab 120a and the negative electrode tab 120b are sealed in an outer packaging material 130. It may protrude outward. At this time, both the positive electrode tab 120a and the negative electrode tab 120b may protrude to one side of the exterior member 130 (see FIG. 1). That is, the positive electrode tab 120a and the negative electrode tab 120b may protrude in one direction (same direction) of the exterior member 130. However, the scope of the present invention is not necessarily limited thereto, and the positive electrode tab 120a may protrude to one side of the exterior member 130 and the negative electrode tab 120b may protrude to the other side of the exterior member 130 (FIG. 2). Reference). That is, the positive electrode tab 120a and the negative electrode tab 120b may protrude in both directions (counter directions) of the exterior member 130. In addition, an insulating tape 125 may be provided on the positive electrode tab 120a and the negative electrode tab 120b. In this case, the insulating tape 125 may extend the outside of the positive electrode tab 120a and the negative electrode tab 120b at a portion where the positive electrode tab 120a and the negative electrode tab 120b overlap with the outer sealing part 133 of the exterior member 130. It is formed to wrap. The insulating tape 125 may not only electrically insulate the positive electrode tab 120a and the negative electrode tab 120b from the exterior member 130, but also improve the sealing property of the exterior member 130 and prevent leakage. On the other hand, according to the secondary battery 100 according to the present embodiment, the electrolyte may be charged into the exterior material 130 in a liquid state, the separator 117 may serve as an electrolyte. Alternatively, the electrolyte may be filled into the exterior material 130 in a liquid state, and then a polymerizable component may be added to finally make the electrolyte in a polymer state.
또한, 본 실시예에 따른 이차전지(100)는 전극조립체(110)가 다수가 구비되어 하나의 외장재(130)의 내부에 수용되는데, 이에 관련된 상세한 내용은 후술하도록 한다.In addition, the secondary battery 100 according to the present embodiment is provided with a plurality of electrode assemblies 110 is accommodated in one of the exterior material 130, the details thereof will be described later.
상기 외장재(130)는 다수의 전극조립체(110)를 수용하는 역할을 한다. 여기서, 외장재(130)는 재질이 알루미늄인 파우치(Pouch)일 수 있고, 도 3 내지 도 4에 도시된 바와 같이, 대략 직육면체의 형상으로 형성될 수 있다. 이러한 외장재(130)는 전극조립체(110)가 전해질과 함께 내부에 수용되는 용기(131)와 용기(131)의 개방된 상면을 덮어주는 커버(132)를 포함할 수 있다. 이때, 외장재(130)는 내부에 수용된 전극조립체(110)의 양극탭(120a)과 음극탭(120b)이 외부로 돌출된 상태에서, 용기(131)의 테두리와 커버(132)의 테두리에 외측 실링부(133)를 형성하여 밀봉시킬 수 있다. 또한, 외장재(130)는 다수의 전극조립체(110)가 분리되도록 인접한 전극조립체(110) 사이에 제1 내측 실링부(135a)와 제2 내측 실링부(135b)가 형성되어 밀봉될 수 있다. 이때, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성된다. 이와 같이, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)가 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성되므로, 제1,2 내측 실링부(135a, 135b) 사이에는 비실링 영역(137, 실링되지 않은 영역)이 존재한다. 이러한 비실링 영역(137)은 접음으로써, 이차전지(100)를 용이하게 스택킹(Stacking)할 수 있는 효과가 있다(도 10 참조). 또는, 비실링 영역(137)을 자름으로써, 다수의 이차전지(100)를 한번에 조립할 수 있고 그에 따라 생산성이 뛰어나고, 생산한 이차전지(100) 사이의 편차를 줄일 수 있는 장점이 있다(도 11 참조). 한편, 제1,2 내측 실링부(135a, 135b)와 같이 실링된 부분을 접거나 자르는 경우, 고온의 실링으로 딱딱해진 무연신 폴리프로필렌(Casted Polypropylene, CPP) 또는 폴리프로필렌(Polypropylene, PP) 등에 크랙(Crack)이 발생하여 절연저항이 저하되는 문제점이 발생할 수 있다. 하지만, 본 실시예에 따른 이차전지(100)는 제1,2 내측 실링부(135a, 135b)가 아닌 제1,2 내측 실링부(135a, 135b)의 사이에 구비된 비실링 영역(137)을 접거나 자름으로써, 상술한 바와 같이 크랙이 발생하지 않아 절연저항이 저하되는 문제점을 방지할 수 있다.The exterior material 130 serves to receive a plurality of electrode assemblies 110. Here, the exterior material 130 may be a pouch (Pouch) is made of aluminum, as shown in Figures 3 to 4, it may be formed in a substantially rectangular parallelepiped shape. The exterior material 130 may include a container 131 in which the electrode assembly 110 is accommodated together with the electrolyte and a cover 132 covering the open top surface of the container 131. At this time, the exterior member 130 has an outer side of the edge of the container 131 and the edge of the cover 132 in a state in which the positive electrode tab 120a and the negative electrode tab 120b of the electrode assembly 110 accommodated therein protrude to the outside. The sealing part 133 may be formed and sealed. In addition, the exterior member 130 may be sealed by forming a first inner sealing part 135a and a second inner sealing part 135b between adjacent electrode assemblies 110 to separate the plurality of electrode assemblies 110. In this case, the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110. As such, since the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110, between the first and second inner sealing parts 135a and 135b. There is an unsealed region 137 (unsealed region). By folding the non-sealing region 137, the secondary battery 100 can be easily stacked (see FIG. 10). Alternatively, by cutting the non-sealing region 137, a plurality of secondary batteries 100 may be assembled at a time, thereby increasing productivity and reducing variations between the produced secondary batteries 100 (FIG. 11). Reference). On the other hand, when folding or cutting the sealed part such as the first and second inner sealing parts 135a and 135b, the unstretched polypropylene (CPP) or polypropylene (Polypropylene, PP), etc. A crack may occur and a problem of lowering insulation resistance may occur. However, in the secondary battery 100 according to the present exemplary embodiment, the non-sealing region 137 provided between the first and second inner sealing parts 135a and 135b instead of the first and second inner sealing parts 135a and 135b. By folding or cutting off, it is possible to prevent the problem that the crack does not occur as described above and the insulation resistance is lowered.
도 6 내지 도 11는 본 발명의 실시예에 따른 이차전지의 제조방법을 공정순서대로 도시한 도면이다.6 to 11 are views illustrating a method of manufacturing a secondary battery according to an embodiment of the present invention in the order of process.
도 6 내지 도 11에 도시된 바와 같이, 본 실시예에 따른 이차전지(100)의 제조방법은 (A) 양극판(113), 음극판(115) 및 세퍼레이터(117)를 포함하는 다수의 전극조립체(110)와 외장재(130)를 준비하는 단계 및 (B) 외장재(130)의 내부에 다수의 전극조립체(110)를 수용하되, 외장재(130) 중 다수의 전극조립체(110)를 분리하도록 인접한 전극조립체(110) 사이에 제1 내측 실링부(135a)와 제2 내측 실링부(135b)를 형성하는 단계를 포함하고, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성된다.6 to 11, the method of manufacturing the secondary battery 100 according to the present embodiment includes (A) a plurality of electrode assemblies including the positive electrode plate 113, the negative electrode plate 115, and the separator 117 ( (B) accommodating a plurality of electrode assemblies 110 in the interior of the exterior material 130, and adjacent electrodes to separate the plurality of electrode assemblies 110 from the exterior material 130. Forming a first inner sealing portion 135a and a second inner sealing portion 135b between the assembly 110, wherein the first inner sealing portion 135a and the second inner sealing portion 135b are adjacent to each other. It is formed to be spaced apart a predetermined distance between the electrode assembly 110.
우선, 도 6에 도시된 바와 같이, 다수의 전극조립체(110)와 외장재(130)를 준비하는 단계이다. 여기서, 전극조립체(110)는 양극판(113)과 음극판(115) 및 세퍼레이터(117)가 권취된 타입(Winding Type)이거나(도 5 참조), 적층된 타입(Stack Type)일 수 있다. 또한, 양극판(113)과 음극판(115)에는 각각 양극탭(120a)과 음극탭(120b)이 접합될 수 있고, 양극탭(120a)과 음극탭(120b)은 최종적으로 밀봉된 외장재(130)의 외측으로 돌출될 수 있다. 도면상, 양극탭(120a)과 음극탭(120b)은 모두 외장재(130)의 일측으로 돌출되었지만, 양극탭(120a)은 외장재(130)의 일측으로 돌출되고 음극탭(120b)은 외장재(130)의 타측으로 돌출될 수 있다(도 4 참조).First, as shown in FIG. 6, a plurality of electrode assemblies 110 and an exterior member 130 are prepared. Here, the electrode assembly 110 may be a winding type (refer to FIG. 5) or a stacked type (stack type) in which the positive electrode plate 113, the negative electrode plate 115, and the separator 117 are wound. In addition, the positive electrode tabs 120a and the negative electrode tabs 120b may be bonded to the positive electrode plate 113 and the negative electrode plate 115, respectively, and the positive electrode tab 120a and the negative electrode tab 120b may be finally sealed. It may protrude outward. In the drawing, both the positive electrode tab 120a and the negative electrode tab 120b protrude to one side of the exterior member 130, but the positive electrode tab 120a protrudes to one side of the exterior member 130 and the negative electrode tab 120b is the exterior member 130. ) May protrude to the other side (see FIG. 4).
한편, 상기 외장재(130)는 다수의 전극조립체(110)를 수용하는 역할을 하는 것으로, 파우치(Pouch)일 수 있다. 이러한 외장재(130)는 전극조립체(110)가 전해질과 함께 내부에 수용되는 용기(131)와 용기(131)의 개방된 상면을 덮어주는 커버(132)를 포함할 수 있다.On the other hand, the exterior member 130 serves to accommodate a plurality of electrode assembly 110, it may be a pouch (Pouch). The exterior material 130 may include a container 131 in which the electrode assembly 110 is accommodated together with the electrolyte and a cover 132 covering the open top surface of the container 131.
다음, 외장재(130)에 외측 실링부(133)와 제1,2 내측 실링부(135a, 135b)를 형성하여, 외장재(130)의 내부에 다수의 전극조립체(110)를 수용하는 단계이다. 구체적으로, 도 9에 도시된 바와 같이, 다수의 전극조립체(110)를 용기(131)의 내부에 배치한 후, 용기(131)의 테두리와 커버(132)의 테두리에 외측 실링부(133)를 형성하여 밀봉할 수 있다. 또한, 외장재(130)는 다수의 전극조립체(110)가 분리되도록 인접한 전극조립체(110) 사이에 제1 내측 실링부(135a)와 제2 내측 실링부(135b)를 형성하여 밀봉할 수 있다. 이때, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성된다. 이하, 외측 실링부(133)와 제1,2 내측 실링부(135a, 135b)를 형성하는 과정을 구체적으로 살펴보도록 한다. 우선, 도 7 내지 도 8에 도시된 바와 같이, 외장재(130)는 무연신 폴리프로필렌(Casted Polypropylene, CPP) 또는 폴리프로필렌(Polypropylene, PP) 등으로 형성된 접착층(130a), 알루미늄 등으로 형성된 금속층(130b) 및 폴리에틸렌테레프탈레이트(Polyethyleneterephthalate, PET) 수지나 나일론(Nylon) 수지 등으로 형성된 절연층(130c) 순으로 적층되어 형성될 수 있다. 여기서, 접착층(130a)은 외장재(130)를 상호간 접착시켜 밀봉시키는 역할을 하고, 금속층(130b)은 공기, 가스 또는 습기 등을 차단하는 역할을 하며, 절연층(130c)은 외부와의 절연성을 확보하는 역할을 한다. 이러한 외장재(130)를 밀봉시키는 공정을 구체적으로 살펴보면, 도 7에 도시된 바와 같이, 외측 실링부(133)와 제1,2 내측 실링부(135a, 135b)가 형성될 부분의 두 접착층(130a)을 대면시킨다. 이후, 도 8에 도시된 바와 같이, 가열수단(140, 히팅 블록(Heating block) 또는 히팅 지그(Heating jig))으로 열과 압력을 가하여 열융착시킨다. 이때, 외장재(130)의 접착층(130a)은 가열수단(140)에서 제공된 열에 의해서 용융상태가 되어 유동 자유도가 증대되고, 식힘 공정을 거쳐 경화되면서 외측 실링부(133)와 제1,2 내측 실링부(135a, 135b)가 형성된다. 한편, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 도 9에 도시된 바와 같이, 인접한 2개의 전극조립체(110) 사이에 소정거리 이격되도록 형성된다. 이와 같이, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)가 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성되므로, 제1 내측 실링부(135a)와 제2 내측 실링부(135b) 사이에는 비실링 영역(137, 실링되지 않은 영역)이 존재한다.Next, the outer sealing part 133 and the first and second inner sealing parts 135a and 135b are formed in the exterior member 130 to accommodate the plurality of electrode assemblies 110 in the exterior member 130. Specifically, as shown in FIG. 9, after the plurality of electrode assemblies 110 are disposed in the interior of the container 131, the outer sealing part 133 is formed on the edge of the container 131 and the edge of the cover 132. Can be formed to seal. In addition, the exterior member 130 may form and seal the first inner sealing part 135a and the second inner sealing part 135b between adjacent electrode assemblies 110 to separate the plurality of electrode assemblies 110. In this case, the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110. Hereinafter, a process of forming the outer sealing part 133 and the first and second inner sealing parts 135a and 135b will be described in detail. First, as shown in FIGS. 7 to 8, the exterior member 130 may include an adhesive layer 130a formed of unstretched polypropylene (CPP) or polypropylene (Polypropylene, PP), a metal layer formed of aluminum, or the like ( 130b) and the insulating layer 130c formed of polyethylene terephthalate (PET) resin or nylon resin. Here, the adhesive layer 130a serves to seal the exterior material 130 to each other to seal each other, the metal layer 130b serves to block air, gas or moisture, and the insulating layer 130c has insulation property with the outside. It has a role to secure. Looking at the process of sealing the packaging material 130 in detail, as shown in Figure 7, the outer sealing portion 133 and the first and second inner sealing portion (135a, 135b) to form the two adhesive layers 130a Face to face). Thereafter, as shown in FIG. 8, heat and pressure are applied by applying heat and pressure to the heating unit 140, a heating block or a heating jig. At this time, the adhesive layer (130a) of the exterior material 130 is melted by the heat provided by the heating means 140 to increase the degree of freedom of flow, hardening through the cooling process, the outer sealing portion 133 and the first and second inner sealing The portions 135a and 135b are formed. Meanwhile, as illustrated in FIG. 9, the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between two adjacent electrode assemblies 110. As such, since the first inner sealing part 135a and the second inner sealing part 135b are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110, the first inner sealing part 135a and the second inner sealing part. There is an unsealed region 137 (unsealed region) between the 135b.
다음, 이차전지(100)를 접거나 자를 수 있다. 구체적으로, 도 10에 도시된 바와 같이, 소정거리 이격된 제1 내측 실링부(135a)와 제2 내측 실링부(135b) 사이에 존재하는 비실링 영역(137)은 접힐 수 있다. 비실링 영역(137)을 접음으로써, 이차전지(100)를 용이하게 스택킹(Stacking)할 수 있는 효과가 있다. 또는, 도 11에 도시된 바와 같이, 소정거리 이격된 제1 내측 실링부(135a)와 제2 내측 실링부(135b) 사이에 존재하는 비실링 영역(137)은 잘릴 수 있다. 비실링 영역(137)을 자름으로써, 2개의 이차전지(100)를 한번에 조립할 수 있고 그에 따라 생산성이 뛰어나고, 생산한 이차전지 사이의 편차를 줄일 수 있는 장점이 있다. 한편, 비실링 영역(137)이 아닌 제1,2 내측 실링부(135a, 135b)를 접거나 자르면, 고온의 실링으로 딱딱해진 무연신 폴리프로필렌(Casted Polypropylene, CPP) 또는 폴리프로필렌(Polypropylene, PP) 등에 크랙(Crack)이 발생하여 절연저항이 떨어질 우려가 있다. 하지만, 본 실시예에서는 제1,2 내측 실링부(135a, 135b)가 아닌 제1,2 내측 실링부(135a, 135b)의 사이에 구비된 비실링 영역(137)을 접거나 자르므로, 크랙이 발생하지 않아 절연저항이 떨어지는 것을 방지할 수 있다.Next, the secondary battery 100 may be folded or cut. In detail, as illustrated in FIG. 10, the non-sealing region 137 existing between the first inner sealing portion 135a and the second inner sealing portion 135b spaced a predetermined distance may be folded. By folding the non-sealing region 137, there is an effect that the secondary battery 100 can be easily stacked. Alternatively, as shown in FIG. 11, the non-sealing region 137 existing between the first inner sealing portion 135a and the second inner sealing portion 135b spaced a predetermined distance may be cut. By cutting the non-sealing region 137, the two secondary batteries 100 can be assembled at a time, thereby increasing productivity and reducing the deviation between the produced secondary batteries. Meanwhile, when the first and second inner sealing parts 135a and 135b, not the non-sealing area 137, are folded or cut, unstretched polypropylene (CPP) or polypropylene (Polypropylene, PP) hardened by high temperature sealing There is a risk of cracking and the like, resulting in a drop in insulation resistance. However, in the present exemplary embodiment, the non-sealing region 137 provided between the first and second inner sealing parts 135a and 135b, not the first and second inner sealing parts 135a and 135b, may be folded or cut. This does not occur and the insulation resistance can be prevented from falling.
도 9는 하나의 외장재(130) 내부에 2개의 전극조립체(110)를 수용한 것을 기준으로 도시하였지만, 본 발명의 권리범위는 이에 한정되는 것은 아니고, 하나의 외장재(130) 내부에 3개 이상의 전극조립체(110)를 수용할 수 있다. 도 12 내지 도 19는 도 9에 도시된 이차전지의 변형예가 접히거나 잘리는 과정을 도시한 사시도로, 이를 참조하여 하나의 외장재(130) 내부에 3개 이상의 전극조립체(110)를 수용하는 구성을 살펴보도록 한다.FIG. 9 illustrates that the two electrode assemblies 110 are accommodated in one exterior member 130, but the scope of the present invention is not limited thereto, and three or more interior components of one exterior member 130 are provided. The electrode assembly 110 may be accommodated. 12 to 19 are perspective views illustrating a process of folding or cutting a modified example of the secondary battery illustrated in FIG. 9. Referring to this, a configuration of accommodating three or more electrode assemblies 110 in one exterior member 130 is described. Let's take a look.
예를 들어, 도 12에 도시된 바와 같이, 하나의 외장재(130) 내부에 전극조립체(110)는 일방향으로 나란히 3개가 구비될 수 있고, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 3개의 전극조립체(110) 중 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성될 수 있다. 이 경우, 비실링 영역(137)은 2개가 존재하고, 도 13에 도시된 바와 같이, 2개의 비실링 영역(137)을 기준으로 지그재그(Zigzag)로 접음으로써, 이차전지(200)를 3층으로 스택킹할 수 있다. 또는, 도 14에 도시된 바와 같이, 2개의 비실링 영역(137)을 자름으로써, 3개의 이차전지(200)를 한번에 조립할 수 있다.For example, as shown in FIG. 12, three electrode assemblies 110 may be provided in one exterior material 130 side by side in one direction. The first inner sealing part 135a and the second inner sealing part may be provided. The 135b may be formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies 110 among the three electrode assemblies 110. In this case, two non-sealing regions 137 exist, and as illustrated in FIG. 13, the secondary battery 200 is three-layered by folding the zigzag based on the two non-sealing regions 137. Can be stacked. Alternatively, as shown in FIG. 14, by cutting the two non-sealing regions 137, three secondary batteries 200 may be assembled at a time.
또한, 도 15에 도시된 바와 같이, 하나의 외장재(130) 내부에 전극조립체(110)는 일방향으로 나란히 4개가 구비될 수 있고, 제1 내측 실링부(135a)와 제2 내측 실링부(135b)는 4개의 전극조립체(110) 중 인접한 전극조립체(110) 사이에 소정거리 이격되도록 형성될 수 있다. 이 경우, 비실링 영역(137)은 3개가 존재하고, 도 16에 도시된 바와 같이, 3개의 비실링 영역(137)을 기준으로 지그재그(Zigzag)로 접음으로써, 이차전지(300)를 4층으로 스택킹할 수 있다. 또는, 도 17에 도시된 바와 같이, 3개의 비실링 영역(137)을 자름으로써, 4개의 이차전지(300)를 한번에 조립할 수 있다.In addition, as shown in FIG. 15, four electrode assemblies 110 may be provided in one exterior material 130 side by side in one direction. The first inner sealing part 135a and the second inner sealing part 135b may be provided. ) May be formed to be spaced a predetermined distance between the adjacent electrode assembly 110 of the four electrode assembly 110. In this case, three non-sealing regions 137 exist, and as illustrated in FIG. 16, the secondary battery 300 is folded into four layers by folding the zigzag based on the three non-sealing regions 137. Can be stacked. Alternatively, as shown in FIG. 17, by cutting three non-sealing regions 137, four secondary batteries 300 may be assembled at a time.
한편, 다수의 전극조립체(110)는 반드시 하나의 외장재(130) 내부에 일방향으로 나란히 구비되어야 하는 것은 아니다. 예를 들어, 도 18에 도시된 바와 같이, 하나의 외장재(130) 내부에 전극조립체(110)는 일방향으로 일방향과 타방향(일방향에 수직방향)으로 각각 나란히 2개씩 총 4개가 구비될 수 있다. 이 경우, 비실링 영역(137)은 2개가 존재하고, 도 19에 도시된 바와 같이, 2개의 비실링 영역(137)을 자름으로써, 4개의 이차전지(400)를 한번에 조립할 수 있다.On the other hand, the plurality of electrode assemblies 110 are not necessarily provided side by side in one direction in one exterior material 130. For example, as shown in FIG. 18, a total of four electrode assemblies 110 may be provided in one exterior material 130, two in one direction and another in the one direction (vertical to one direction). . In this case, two non-sealing regions 137 exist, and as illustrated in FIG. 19, four secondary batteries 400 may be assembled at a time by cutting two non-sealing regions 137.
이상 본 발명을 구체적인 실시예를 통하여 상세히 설명하였으나, 이는 본 발명을 구체적으로 설명하기 위한 것으로, 본 발명은 이에 한정되지 않으며, 본 발명의 기술적 사상 내에서 당 분야의 통상의 지식을 가진 자에 의해 그 변형이나 개량이 가능함이 명백하다.Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto, and should be understood by those skilled in the art within the technical spirit of the present invention. It is obvious that modifications and improvements are possible.
본 발명의 단순한 변형 내지 변경은 모두 본 발명의 영역에 속하는 것으로 본 발명의 구체적인 보호 범위는 첨부된 특허청구범위에 의하여 명확해질 것이다.All simple modifications and variations of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be apparent from the appended claims.
[부호의 설명][Description of the code]
100, 200, 300, 400: 이차전지 100, 200, 300, 400: secondary battery
110: 전극조립체110: electrode assembly
113: 양극판 113: positive plate
115: 음극판115: negative electrode plate
117: 세퍼레이터 117: separator
120a: 양극탭120a: positive electrode tab
120b: 음극탭 120b: negative electrode tab
125: 절연 테이프125: insulating tape
130: 외장재 130: exterior material
130a: 접착층130a: adhesive layer
130b: 금속층 130b: metal layer
130c: 절연층130c: insulation layer
131: 용기 131: Courage
132: 커버132: cover
133: 외측 실링부 133: outer sealing part
135a: 제1 내측 실링부135a: first inner sealing part
135b: 제2 내측 실링부 135b: second inner sealing part
137: 비실링 영역137: unsealed area
140: 가열수단140: heating means

Claims (24)

  1. 양극판, 음극판 및 세퍼레이터를 포함하는 다수의 전극조립체; 및A plurality of electrode assemblies including a positive electrode plate, a negative electrode plate, and a separator; And
    다수의 상기 전극조립체를 내부에 수용하되, 다수의 상기 전극조립체가 분리되도록 인접한 상기 전극조립체 사이에 제1 내측 실링부와 제2 내측 실링부가 형성된 외장재;An exterior member accommodating a plurality of electrode assemblies therein, wherein a first inner sealing part and a second inner sealing part are formed between the adjacent electrode assemblies to separate the plurality of electrode assemblies;
    를 포함하고,Including,
    상기 제1 내측 실링부와 상기 제2 내측 실링부는 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성되는 이차전지.And the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies.
  2. 청구항 1에 있어서,The method according to claim 1,
    인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이는 접히는 이차전지.The secondary battery is folded between the first inner sealing portion and the second inner sealing portion spaced a predetermined distance between the adjacent electrode assembly.
  3. 청구항 1에 있어서,The method according to claim 1,
    인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이는 잘리는 이차전지.The secondary battery is cut between the first inner sealing portion and the second inner sealing portion spaced apart by a predetermined distance between the adjacent electrode assembly.
  4. 청구항 1에 있어서,The method according to claim 1,
    상기 외장재는 파우치인 이차전지.The exterior material is a pouch secondary battery.
  5. 청구항 4에 있어서,The method according to claim 4,
    상기 외장재는 접착층, 금속층 및 절연층 순으로 적층되어 형성된 이차전지.The exterior material is a secondary battery formed by laminating in order of an adhesive layer, a metal layer and an insulating layer.
  6. 청구항 1에 있어서,The method according to claim 1,
    상기 외장재는 열융착시켜 상기 제1 내측 실링부와 상기 제2 내측 실링부가 형성되는 이차전지.The exterior material is heat-sealed so that the first inner sealing portion and the second inner sealing portion are formed.
  7. 청구항 1에 있어서,The method according to claim 1,
    상기 전극조립체는 2개이고,The electrode assembly is two,
    상기 제1 내측 실링부와 상기 제2 내측 실링부는 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성되는 이차전지.And the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies.
  8. 청구항 1에 있어서,The method according to claim 1,
    상기 전극조립체는 3개이고,The electrode assembly is three,
    상기 제1 내측 실링부와 상기 제2 내측 실링부는 3개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성되는 이차전지.And the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies among the three electrode assemblies.
  9. 청구항 1에 있어서,The method according to claim 1,
    상기 전극조립체는 4개이고,The electrode assembly is four,
    상기 제1 내측 실링부와 상기 제2 내측 실링부는 4개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성되는 이차전지.The first inner sealing portion and the second inner sealing portion is a secondary battery formed to be spaced apart a predetermined distance between the adjacent electrode assembly of the four electrode assembly.
  10. 청구항 1에 있어서,The method according to claim 1,
    상기 양극판에 접합되어 상기 외장재의 외측으로 돌출된 양극탭; 및A positive electrode tab bonded to the positive plate to protrude outwardly of the packaging material; And
    상기 음극판에 접합되어 상기 외장재의 외측으로 돌출된 음극탭;A negative electrode tab bonded to the negative electrode plate and protruding to the outside of the packaging material;
    을 더 포함하는 이차전지.Secondary battery comprising more.
  11. 청구항 10에 있어서,The method according to claim 10,
    상기 양극탭과 상기 음극탭은 상기 외장재의 일측으로 돌출된 이차전지.The positive electrode tab and the negative electrode tab protrudes to one side of the packaging material.
  12. 청구항 10에 있어서,The method according to claim 10,
    상기 양극탭은 상기 외장재의 일측으로 돌출되고, 상기 음극탭은 상기 외장재의 타측으로 돌출된 이차전지.The positive electrode tab protrudes to one side of the packaging material, and the negative electrode tab protrudes to the other side of the packaging material.
  13. (A) 양극판, 음극판 및 세퍼레이터를 포함하는 다수의 전극조립체와 외장재를 준비하는 단계; 및(A) preparing a plurality of electrode assemblies and exterior materials including a positive electrode plate, a negative electrode plate, and a separator; And
    (B) 상기 외장재의 내부에 다수의 상기 전극조립체를 수용하되, 상기 외장재 중 다수의 상기 전극조립체를 분리하도록 인접한 상기 전극조립체 사이에 제1 내측 실링부와 제2 내측 실링부를 형성하는 단계;(B) accommodating a plurality of electrode assemblies in the exterior member, and forming a first inner sealing portion and a second inner sealing portion between adjacent electrode assemblies to separate the plurality of electrode assemblies from the exterior member;
    를 포함하고,Including,
    상기 제1 내측 실링부와 상기 제2 내측 실링부는 인접한 상기 전극조립체 사이에 소정거리 이격되도록 형성되는 이차전지의 제조방법.And the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance between the adjacent electrode assemblies.
  14. 청구항 13에 있어서,The method according to claim 13,
    상기 (B) 단계 이후에,After the step (B),
    인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이를 접는 단계;Folding between the first inner sealing part and the second inner sealing part spaced a predetermined distance apart from the adjacent electrode assembly;
    를 더 포함하는 이차전지의 제조방법.Method of manufacturing a secondary battery further comprising.
  15. 청구항 13에 있어서,The method according to claim 13,
    상기 (B) 단계 이후에,After the step (B),
    인접한 상기 전극조립체 사이에 소정거리 이격된 상기 제1 내측 실링부와 상기 제2 내측 실링부 사이를 자르는 단계;Cutting between the first inner sealing part and the second inner sealing part spaced apart by a predetermined distance between the adjacent electrode assemblies;
    를 더 포함하는 이차전지의 제조방법.Method of manufacturing a secondary battery further comprising.
  16. 청구항 13에 있어서,The method according to claim 13,
    상기 외장재는 파우치인 이차전지의 제조방법.The packaging material is a pouch secondary battery manufacturing method.
  17. 청구항 16에 있어서,The method according to claim 16,
    상기 외장재는 접착층, 금속층 및 절연층 순으로 적층되어 형성된 이차전지의 제조방법.The exterior material is a method of manufacturing a secondary battery formed by laminating in order of an adhesive layer, a metal layer and an insulating layer.
  18. 청구항 13에 있어서,The method according to claim 13,
    상기 (B) 단계에서,In the step (B),
    상기 외장재를 열융착시켜 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성하는 이차전지의 제조방법.The method of manufacturing a secondary battery by thermally bonding the packaging material to form the first inner sealing part and the second inner sealing part.
  19. 청구항 13에 있어서,The method according to claim 13,
    상기 (A) 단계에서,In the step (A),
    상기 전극조립체는 2개이고,The electrode assembly is two,
    상기 (B) 단계에서,In the step (B),
    인접한 상기 전극조립체 사이에 소정거리 이격되도록 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성하는 이차전지의 제조방법.The method of claim 2, wherein the first inner sealing part and the second inner sealing part are formed to be spaced apart from each other by the adjacent electrode assembly.
  20. 청구항 13에 있어서,The method according to claim 13,
    상기 (A) 단계에서,In the step (A),
    상기 전극조립체는 3개이고,The electrode assembly is three,
    상기 (B) 단계에서,In the step (B),
    3개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성하는 이차전지의 제조방법.The method of claim 2, wherein the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance between adjacent electrode assemblies among the three electrode assemblies.
  21. 청구항 13에 있어서,The method according to claim 13,
    상기 (A) 단계에서,In the step (A),
    상기 전극조립체는 4개이고,The electrode assembly is four,
    상기 (B) 단계에서,In the step (B),
    4개의 상기 전극조립체 중 인접한 상기 전극조립체 사이에 소정거리 이격되도록 상기 제1 내측 실링부와 상기 제2 내측 실링부를 형성하는 이차전지의 제조방법.The method of claim 2, wherein the first inner sealing part and the second inner sealing part are formed to be spaced apart by a predetermined distance between adjacent electrode assemblies among the four electrode assemblies.
  22. 청구항 13에 있어서,The method according to claim 13,
    상기 양극판에 접합되어 상기 외장재의 외측으로 돌출된 양극탭; 및A positive electrode tab bonded to the positive plate to protrude outwardly of the packaging material; And
    상기 음극판에 접합되어 상기 외장재의 외측으로 돌출된 음극탭;A negative electrode tab bonded to the negative electrode plate and protruding to the outside of the packaging material;
    을 더 포함하는 이차전지의 제조방법.Method of manufacturing a secondary battery further comprising.
  23. 청구항 22에 있어서,The method according to claim 22,
    상기 양극탭과 상기 음극탭은 상기 외장재의 일측으로 돌출된 이차전지의 제조방법.The positive electrode tab and the negative electrode tab is a manufacturing method of a secondary battery protruding to one side of the packaging material.
  24. 청구항 22에 있어서,The method according to claim 22,
    상기 양극탭은 상기 외장재의 일측으로 돌출되고, 상기 음극탭은 상기 외장재의 타측으로 돌출된 이차전지의 제조방법.The positive electrode tab protrudes to one side of the packaging material, the negative electrode tab is a manufacturing method of a secondary battery protruding to the other side of the packaging material.
PCT/KR2013/008079 2012-09-06 2013-09-06 Secondary battery WO2014038891A1 (en)

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