WO2023195730A1 - 안전성이 개선된 각형 이차전지 - Google Patents
안전성이 개선된 각형 이차전지 Download PDFInfo
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- WO2023195730A1 WO2023195730A1 PCT/KR2023/004505 KR2023004505W WO2023195730A1 WO 2023195730 A1 WO2023195730 A1 WO 2023195730A1 KR 2023004505 W KR2023004505 W KR 2023004505W WO 2023195730 A1 WO2023195730 A1 WO 2023195730A1
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- foil
- electrode assembly
- electrode
- tab
- separator
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- 229910006404 SnO 2 Inorganic materials 0.000 description 2
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- 230000000694 effects Effects 0.000 description 2
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- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
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- 230000035939 shock Effects 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910016467 AlCl 4 Inorganic materials 0.000 description 1
- 229910017008 AsF 6 Inorganic materials 0.000 description 1
- 229910020366 ClO 4 Inorganic materials 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XTHFKEDIFFGKHM-UHFFFAOYSA-N Dimethoxyethane Chemical compound COCCOC XTHFKEDIFFGKHM-UHFFFAOYSA-N 0.000 description 1
- 229910020213 PB(Mg3Nb2/3)O3-PbTiO3 Inorganic materials 0.000 description 1
- 229910020210 Pb(Mg3Nb2/3)O3—PbTiO3 Inorganic materials 0.000 description 1
- 229910018286 SbF 6 Inorganic materials 0.000 description 1
- 229910002367 SrTiO Inorganic materials 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- GEIAQOFPUVMAGM-UHFFFAOYSA-N ZrO Inorganic materials [Zr]=O GEIAQOFPUVMAGM-UHFFFAOYSA-N 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001339 alkali metal compounds Chemical class 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
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- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 150000003606 tin compounds Chemical class 0.000 description 1
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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
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
-
- 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
-
- 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 disclosed invention relates to a prismatic secondary battery with improved safety by preventing damage to the outer separator of the electrode assembly or explosion of the electrode assembly due to external shock.
- secondary batteries can be recharged and have been extensively researched and developed in recent years due to their small size and high capacity.
- Secondary batteries are classified into coin-shaped batteries, cylindrical batteries, square-shaped batteries, and pouch-shaped batteries, depending on the shape of the battery case.
- the electrode assembly mounted inside the battery case in a secondary battery is a power generating element capable of charging and discharging consisting of a stacked structure of electrodes and a separator.
- the electrode assembly is a jellyroll type in which a sheet-like positive and negative electrode coated with an active material is wound with a separator interposed therebetween, a stack type in which a plurality of positive electrodes and negative electrodes are sequentially stacked with a separator interposed, and It can be roughly classified into the Stack & Folding type, in which stacked unit cells are wound with a long length of separation film.
- a secondary battery including a prismatic case that is, a prismatic secondary battery, encloses a completed electrode assembly in a case with an open surface.
- the outermost separator of the electrode assembly may be damaged by the edges of the case. Additionally, during use of a square secondary battery, the outermost separator of the electrode assembly may be damaged as a result of an impact being applied to the case, causing deformation, or an object such as a nail penetrating the case.
- Patent Document 001 Korean Patent Publication No. 10-2018-0085132 (published on July 26, 2018)
- the purpose of the present invention is to provide a prismatic secondary battery with improved safety that can prevent various hazards such as internal short circuits and explosions caused by damage to the outermost separator of an electrode assembly in which a plurality of unit cells are stacked in a stack structure. there is.
- the present invention relates to an electrode assembly in which a plurality of unit cells with a separator interposed between an anode and a cathode are stacked in a stack structure.
- the outermost part of the electrode assembly includes a positive electrode foil, a negative electrode foil, and the positive electrode.
- a protective stack layer in which a separator is laminated is provided between the foil and the cathode foil and on the outside thereof.
- the protective stack layer forms a structure in which a cathode foil, a separator, an anode foil, and a separator are laminated in that order when the outermost electrode of the electrode assembly is the anode.
- the protective stack layer has a structure in which a positive electrode foil, a separator, a negative electrode foil, and a separator are laminated in that order.
- the protective stack layer may be provided on both outermost sides of the electrode assembly.
- the size of the protective stack layer may be no smaller than the size of the outermost unit cell of the electrode assembly.
- the positive electrode foil and the negative electrode foil each have a positive electrode foil tab and a negative electrode foil tab
- the positive electrode foil tab is electrically connected to the positive electrode tab of the electrode assembly
- the negative electrode foil tab is It may be electrically connected to the cathode tab of the electrode assembly.
- the protective stack layer buffers internal short circuits occurring in the electrode assembly.
- the present invention relates to a case having at least one surface forming an opening; and an electrode assembly in which a plurality of unit cells with a separator interposed between an anode and a cathode are stacked in a stack structure and stored in the case; and the electrode.
- a cap plate including a positive and negative terminal electrically connected to the positive and negative tabs of the assembly and joined to seal the opening of the case; and an electrolyte filled in the case to impregnate the electrode assembly, and a protective stack layer including a positive electrode foil and a negative electrode foil on the outermost side of the electrode assembly, and a separator layer between and outside the positive electrode foil and the negative electrode foil, respectively.
- the positive electrode foil and the negative electrode foil each have a positive electrode foil tab and a negative electrode foil tab, the positive electrode foil tab is electrically connected to the positive electrode tab of the electrode assembly, and the negative electrode foil tab is connected to the positive electrode tab of the electrode assembly.
- a rectangular secondary battery electrically connected to a negative electrode tab is provided.
- the protective stack layer has a structure in which a cathode foil, a separator, an anode foil, and a separator are laminated in that order.
- the protective stack layer has a structure in which a positive electrode foil, a separator, a negative electrode foil, and a separator are laminated in that order.
- the size of the protective stack layer may be no smaller than the size of the outermost unit cell of the electrode assembly.
- the protective stack layer buffers internal short circuits occurring in the electrode assembly.
- the laminated structure of the anode foil, cathode foil, and separator of the protective stack layer provided on the outermost layer of the electrode assembly serves to prevent physical damage to the electrode assembly. Accordingly, the protective stack layer prevents damage to the outermost separator during the process of inserting the electrode assembly into the case, or damage to the electrode assembly due to needle penetration, compression, impact, etc.
- the protective stack layer is a pair of positive and negative electrode foils, and is electrically connected to the positive and negative terminals of the cap plate, so that when an electric short occurs in the electrode assembly, the electrode assembly coated with the active material Compared to the anode and cathode, the protective stack layer reacts first and buffers the internal short. Accordingly, the present invention greatly reduces the risk of fire or explosion due to damage to the electrode assembly due to internal short circuit or thermal runaway of the electrode assembly by using the protective stack layer.
- FIG. 1 is a diagram showing a unit cell with a separator interposed between an anode and a cathode.
- FIG. 2 is a diagram illustrating an electrode assembly in which a plurality of unit cells of FIG. 1 are stacked in a stack structure.
- Figure 3 is a diagram showing an electrode assembly provided with a protective stack layer according to one embodiment of the present invention.
- Figure 4 is a diagram showing an electrode assembly provided with a protective stack layer according to another embodiment of the present invention.
- FIG. 5 is a diagram showing an example of a prismatic secondary battery including the electrode assembly of FIG. 3.
- FIG. 6 is a diagram showing an example of a prismatic secondary battery including the electrode assembly of FIG. 4.
- the present invention relates to an electrode assembly in which a plurality of unit cells with a separator interposed between an anode and a cathode are stacked in a stack structure.
- the outermost part of the electrode assembly includes a positive electrode foil, a negative electrode foil, and the positive electrode.
- a protective stack layer in which a separator is laminated is provided between the foil and the cathode foil and on the outside thereof.
- the electrode assembly of the present invention has various risks of internal short and explosion caused by damage to the outermost separator during the process of insertion into the case, or damage to the outermost separator by needle penetration, compression, impact, etc. This can be prevented with a protective stack layer.
- the anode foil and the cathode foil of the protective stack layer each have an anode foil tab and a cathode foil tab, the anode foil tab is electrically connected to the anode tab of the electrode assembly, and the cathode foil tab may be electrically connected to the negative electrode tab of the electrode assembly.
- the protective stack layer reacts to an internal short occurring in the electrode assembly before the plurality of unit cells and buffers the electrical shock. Accordingly, the electrode assembly of the present invention exhibits strong durability against mechanical damage as well as electrical damage.
- FIG. 1 is a diagram showing a unit cell 10 with a separator 40 interposed between the anode 20 and the cathode 30, and FIG. 2 shows a plurality of unit cells 10 of FIG. 1 stacked in a stack structure. This is a diagram showing the electrode assembly 100.
- the unit cell 10 shown is a full cell, and a separator 40 is interposed between the anode 20 and the cathode 30.
- the positive electrode 20 includes a positive electrode current collector 22 and a positive electrode active material 24 applied on one or both sides of the positive electrode current collector 22.
- An uncoated area 26 in which the positive electrode active material 24 is not applied exists at one end of the positive electrode current collector 22 in the width direction.
- the positive electrode tab 110 is formed by performing notching (punching) processing on the uncoated portion 26.
- the negative electrode 30 includes a negative electrode current collector 32 and a negative electrode active material 34 applied on one or both sides of the negative electrode current collector 32.
- An uncoated area 36 in which the negative electrode active material 34 is not applied exists at one end of the negative electrode current collector 32 in the width direction.
- the negative electrode uncoated portion 36 functions as the negative electrode tab 120.
- the positive electrode active material 24 coated on the positive electrode current collector 22 and the electrode active material coated on the negative electrode current collector 32 may be used without limitation as long as they are active materials known in the art.
- the positive electrode active material 24 has the general formula A[A , Al, Ti, Si, Fe, Mo, V, Zr, Zn, Cu, Al, Mo, Sc, Zr, Ru, and Cr; x ⁇ 0, 1 ⁇ x+y ⁇ 2, 0.1 ⁇ z ⁇ 2; the stoichiometric coefficients of the components included in x, y, z and M are selected so that the compound remains electrically neutral.
- the positive electrode active material 24 is an alkali metal compound xLiM 1 O 2 (1x)Li 2 M 2 O 3 disclosed in US6,677,082, US6,680,143, etc.
- M 1 is at least one element having an average oxidation state of 3
- M 2 may include at least one element having an average oxidation state of 4; 0 ⁇ x ⁇ 1).
- the positive electrode active material 24 has the general formula Li a M 1 x Fe 1x M 2 y P 1y M 3 z O 4z (M 1 is Ti, Si, Mn, Co, Fe, V, Cr, Mo , Ni, Nd, Al, Mg and Al; M 2 includes Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Contains at least one element selected from Sb, Si, Ge, V and S; M 3 includes a halogen element optionally including F; 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1; the stoichiometric coefficients of the components included in a, x, y, z, M 1 , M 2 , and M 3 are chosen to ensure that the compound remains electrically neutral, or ) 3 [M includes at least one element selected from Ti, Si, Mn, Fe, Co, V, Cr, Mo
- the positive electrode active material 24 may include primary particles and/or secondary particles in which primary particles are aggregated.
- the negative electrode active material 34 may be made of carbon material, lithium metal or a lithium metal compound, silicon or a silicon compound, tin or a tin compound, etc.
- Metal oxides such as TiO 2 and SnO 2 with a potential of less than 2V can also be used as the negative electrode active material 34.
- carbon materials both low-crystalline carbon and high-crystalline carbon can be used.
- the separator 40 interposed between the anode 20 and the cathode 30 is a porous polymer film, for example, ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, ethylene/metabolite.
- Porous polymer films made of polyolefin-based polymers such as acrylate copolymers can be used alone or by laminating them.
- the separator 40 may use a typical porous non-woven fabric, for example, a non-woven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, etc.
- At least one surface of the separator 40 may include a coating layer of inorganic particles. It is also possible that the separator 40 itself is made of a coating layer of inorganic particles. The particles constituting the coating layer may have a structure combined with a binder such that an interstitial volume exists between adjacent particles.
- the inorganic particles may be made of an inorganic material with a dielectric constant of 5 or more.
- the inorganic particles include Pb(Zr,Ti)O 3 (PZT), Pb 1x La x Zr 1y Ti y O 3 (PLZT), PB(Mg 3 Nb 2/3 )O 3 PbTiO 3 ( PMNPT), BaTiO 3 , hafnia(HfO 2 ), SrTiO 3 , TiO 2 , Al 2 O 3 , ZrO 2 , SnO 2 , CeO 2 , MgO, CaO, ZnO and Y 2 O 3 At least one selected from the group consisting of May contain substances.
- the electrolyte forming the electrolyte solution 530 in which the electrode assembly 100 is impregnated may be a salt having a structure such as A + B - .
- a + includes alkali metal cations such as Li + , Na + , K + or ions consisting of a combination thereof.
- B - is F - , Cl - , Br - , I - , NO 3 - , N(CN) 2 - , BF 4 - , ClO 4 - , AlO 4 - , AlCl 4 - , PF 6 - , SbF 6 - , AsF 6 - , BF 2 C 2 O 4 - , BC 4 O 8 - , (CF 3 ) 2 PF 4 - , (CF 3 ) 3 PF 3 - , (CF 3 ) 4 PF 2 - , (CF 3 ) 5 PF - , (CF 3 ) 6 P - , CF 3 SO 3 - , C 4 F 9 SO 3 - , CF 3 CF 2 SO 3 - , (CF 3 SO 2 ) 2 N - , (FSO 2 ) 2 N - , CF 3 CF 2 (CF 3 ) 2 CO - , (CF 3 SO 2 ) 2 CH
- the electrolyte can also be used by dissolving it in an organic solvent.
- Organic solvents include propylene carbonate (PC), ethylene carbonate (EC), diethyl carbonate (DEC), dimethyl carbonate (DMC), and dipropyl carbonate (DPC). , dimethyl sulfoxide, acetonitrile, dimethoxyethane, diethoxyethane, tetrahydrofuran, N-methyl-2-pyrrolidone (N-methyl- 2-pyrrolidone (NMP), ethyl methyl carbonate (EMC), gamma butyrolactone ( ⁇ -butyrolactone), or mixtures thereof may be used.
- PC propylene carbonate
- EC ethylene carbonate
- DEC diethyl carbonate
- DMC dimethyl carbonate
- DPC dipropyl carbonate
- dimethyl sulfoxide acetonitrile
- dimethoxyethane dimethoxyethane
- FIG. 2 shows an electrode assembly 100 in which a plurality of unit cells 10 having the above configuration are stacked in a stack structure.
- the electrode assembly 100 of FIG. 2 is a bicell having an anode/separator/cathode/separator/anode structure, and may also have a cathode/separator/anode/separator/cathode structure.
- the bicell shown in FIG. The capacity of the electrode assembly 100 can be further expanded by stacking.
- FIG. 3 is a diagram illustrating an electrode assembly 100 provided with a protective stack layer 200 according to an embodiment of the present invention.
- the protective stack layer 200 is a laminated structure provided on the outermost part of the electrode assembly 100, between and on the outside of the anode foil 210 and the cathode foil 220, and the anode foil 210 and the cathode foil 220.
- Each separator 40 forms a stacked structure.
- the positive electrode foil 210 forming the protective stack layer 200 is a metal corresponding to the positive electrode current collector 22 on which the positive electrode active material 24 is not applied.
- the material of the positive electrode foil 210 may be the same as that of the positive electrode current collector 22.
- the positive electrode foil 210 and the positive electrode current collector 22 may be made of aluminum.
- the negative electrode foil 220 is a metal corresponding to the negative electrode current collector 32 on which the negative electrode active material 34 is not applied, and the material of the negative electrode foil 220 may be the same as that of the negative electrode current collector 32.
- the negative electrode foil 220 and the negative electrode current collector 32 may be made of copper.
- the laminated structure of the anode foil 210, the cathode foil 220, and the separator 40 of the protective stack layer 200 serves to prevent physical damage to the outermost layer of the electrode assembly 100. That is, the protective stack layer ( 200) is prevented. Accordingly, it may be desirable that the size of the protective stack layer 200 is not smaller than the size of the outermost unit cell 10 of the electrode assembly 100.
- the electrode assembly 100 of FIG. 3 is a case where the outermost electrode is the anode 20, and the protective stack layer 200 is the cathode foil 220, the separator 40, the anode foil 210, and the separator 40. It forms a sequentially layered structure.
- the electrode assembly 100 of FIG. 4 is a case in which the outermost electrode is the cathode 30, and has a structure in which the anode foil 210, the separator 40, the cathode foil 220, and the separator 40 are stacked in that order.
- the protective stack layer 200 may be provided on both outermost sides of the electrode assembly 100.
- the electrode assembly 100 always has a pair of anode foil 210 and cathode foil 220, although the stacking order varies depending on the polarity of the outermost electrode. It is being achieved. This is to enable the protective stack layer 200 of the present invention to function not only as a mechanical barrier but also as an electrical barrier. This will be explained in detail in the relevant section.
- FIG. 5 is a diagram showing an example of a prismatic secondary battery 500 including the electrode assembly 100 of FIG. 3, and FIG. 6 is an example of a prismatic secondary battery 500 including the electrode assembly 100 of FIG. 4. This is a drawing showing.
- the illustrated prismatic secondary battery 500 exemplifies the case where the above-described electrode assembly 100 is applied to the prismatic secondary battery 500.
- the prismatic secondary battery 500 includes a case 510 having an opening on at least one side, the electrode assembly 100 described above, and electrically connected to the positive electrode tab 110 and the negative electrode tab 120 of the electrode assembly 100.
- a cap plate 520 having a positive terminal 522 and a negative terminal 524 and joined to seal the opening of the case 510, and an electrolyte 530 filled in the case 510 to impregnate the electrode assembly 100. ) includes.
- a protective stack layer 200 is provided at the outermost part of the electrode assembly 100, and the anode foil 210 and the cathode foil 220 constituting the protective stack layer 200 are the anode foil tab 212 and the cathode foil, respectively. It is provided with a tab 222. Additionally, the anode foil tab 212 is electrically connected to the anode tab 110 of the electrode assembly 100, and the cathode foil tab 222 is electrically connected to the cathode tab 120 of the electrode assembly 100. do.
- the positive electrode foil tab 212 and the negative electrode foil tab 222 of the protective stack layer 200 are connected to the cap plate 520 together with the positive electrode tab 110 and the negative electrode tab 120 of the electrode assembly 100, respectively. It is connected to the positive terminal 522 and the negative terminal 524.
- the positive electrode foil tab 212 and the positive electrode tab 110 are welded together to the positive lead 523
- the negative foil tab 222 and the negative electrode tab 120 are welded together to the negative lead 525. It is done.
- the protective stack layer 200 is electrically connected to the electrode assembly 100, but since no active material is applied to the positive electrode foil 210 and the negative electrode foil 220 of the protective stack layer 200, the prismatic secondary battery It is not directly involved in the charging and discharging of (500).
- the protective stack layer 200 includes a pair of anode foil 210 and cathode foil 220 and is electrically connected to the anode terminal 522 and cathode terminal 524 of the cap plate 520, When an electric short circuit occurs in the electrode assembly 100, the protective stack layer 200 reacts first compared to the anode 20 and cathode 30 of the electrode assembly 100 coated with the active material to buffer the internal short circuit. .
- the protection stack layer 200 electrically connected to the positive electrode terminal 522 and the negative terminal 524 prevents damage to the electrode assembly 100 due to an internal short, fire or explosion due to thermal runaway of the electrode assembly 100. The risk is greatly reduced.
- unit cell 20 anode
- electrode assembly 110 anode tab
- cathode tab 200 protective stack layer
- cathode foil 222 cathode foil tab
- cap plate 522 positive terminal
- cathode lead 530 electrolyte
- the present invention is a useful technology for improving and improving the safety of secondary batteries.
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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)
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
Description
Claims (12)
- 양극과 음극 사이에 분리막이 개재된 복수의 단위 셀이 스택 구조로 적층된 전극 조립체에 있어서,상기 전극 조립체의 최외곽에는, 양극 포일과 음극 포일, 그리고 상기 양극 포일과 음극 포일 사이 및 외곽에 각각 분리막이 적층된 보호 스택층이 구비되는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 보호 스택층은,상기 전극 조립체의 최외곽 전극이 양극인 경우에,음극 포일, 분리막, 양극 포일, 분리막의 순서로 적층된 구조를 이루는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 보호 스택층은,상기 전극 조립체의 최외곽 전극이 음극인 경우에,양극 포일, 분리막, 음극 포일, 분리막의 순서로 적층된 구조를 이루는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 보호 스택층은 상기 전극 조립체의 양쪽 최외곽에 모두 구비되는 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 보호 스택층의 크기는 상기 전극 조립체의 최외곽 단위 셀의 크기보다 작지 않은 것을 특징으로 하는 전극 조립체.
- 제1항에 있어서,상기 양극 포일과 음극 포일은 각각 양극 포일 탭과 음극 포일 탭을 구비하고,상기 양극 포일 탭은 상기 전극 조립체의 양극 탭에 대해 전기적으로 연결되며, 상기 음극 포일 탭은 상기 전극 조립체의 음극 탭에 대해 전기적으로 연결되는 것을 특징으로 하는 전극 조립체.
- 제6항에 있어서,상기 보호 스택층은,상기 전극 조립체에서 발생한 내부 쇼트를 완충하는 것을 특징으로 하는 전극 조립체.
- 적어도 어느 일면이 개구부를 형성하는 케이스;양극과 음극 사이에 분리막이 개재된 복수의 단위 셀이 스택 구조로 적층되어 있고, 상기 케이스 안에 수납되는 전극 조립체;상기 전극 조립체의 양극 탭과 음극 탭에 전기적으로 연결된 양극 단자와 음극 단자를 포함하고, 상기 케이스의 개구부를 밀봉하도록 접합되는 캡 플레이트; 및상기 전극 조립체를 함침히도록 상기 케이스에 충진되는 전해액;을 포함하고,상기 전극 조립체의 최외곽에는, 양극 포일과 음극 포일, 그리고 상기 양극 포일과 음극 포일 사이 및 외곽에 각각 분리막이 적층된 보호 스택층이 구비되며,상기 양극 포일과 음극 포일은 각각 양극 포일 탭과 음극 포일 탭을 구비하고,상기 양극 포일 탭은 상기 전극 조립체의 양극 탭에 대해 전기적으로 연결되며, 상기 음극 포일 탭은 상기 전극 조립체의 음극 탭에 대해 전기적으로 연결되는, 각형 이차전지.
- 제8항에 있어서,상기 보호 스택층은,상기 전극 조립체의 최외곽 전극이 양극인 경우에,음극 포일, 분리막, 양극 포일, 분리막의 순서로 적층된 구조를 이루는 것을 특징으로 하는 각형 이차전지.
- 제8항에 있어서,상기 보호 스택층은,상기 전극 조립체의 최외곽 전극이 음극인 경우에,양극 포일, 분리막, 음극 포일, 분리막의 순서로 적층된 구조를 이루는 것을 특징으로 하는 각형 이차전지.
- 제8항에 있어서,상기 보호 스택층의 크기는 상기 전극 조립체의 최외곽 단위 셀의 크기보다 작지 않은 것을 특징으로 하는 각형 이차전지.
- 제8항에 있어서,상기 보호 스택층은,상기 전극 조립체에서 발생한 내부 쇼트를 완충하는 것을 특징으로 하는 각형 이차전지.
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CN202380012140.8A CN117425998A (zh) | 2022-04-05 | 2023-04-04 | 具有改进的稳定性的棱柱形二次电池 |
EP23784954.2A EP4329043A1 (en) | 2022-04-05 | 2023-04-04 | Prismatic secondary battery having improved stability |
JP2023574682A JP2024520715A (ja) | 2022-04-05 | 2023-04-04 | 安全性が改善された角型二次電池 |
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US6680143B2 (en) | 2000-06-22 | 2004-01-20 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
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JP2016152170A (ja) * | 2015-02-18 | 2016-08-22 | 日立オートモティブシステムズ株式会社 | 角形二次電池及びその製造方法 |
KR20180100526A (ko) * | 2015-03-18 | 2018-09-11 | 도요타지도샤가부시키가이샤 | 비수 전해질 이차 전지 |
KR20190050928A (ko) * | 2017-11-03 | 2019-05-14 | 어드밴스드 배터리 컨셉츠, 엘엘씨 | 바이폴라 배터리 조립체 |
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KR102225091B1 (ko) | 2017-01-18 | 2021-03-09 | 주식회사 엘지화학 | 고용량화를 위한 분리막 구조를 가진 전극조립체 및 이를 포함하는 전지셀 |
-
2022
- 2022-04-05 KR KR1020220042011A patent/KR20230143300A/ko unknown
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- 2023-04-04 CN CN202380012140.8A patent/CN117425998A/zh active Pending
- 2023-04-04 WO PCT/KR2023/004505 patent/WO2023195730A1/ko active Application Filing
- 2023-04-04 EP EP23784954.2A patent/EP4329043A1/en active Pending
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Patent Citations (7)
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US6677082B2 (en) | 2000-06-22 | 2004-01-13 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
US6680143B2 (en) | 2000-06-22 | 2004-01-20 | The University Of Chicago | Lithium metal oxide electrodes for lithium cells and batteries |
US20100136411A1 (en) * | 2008-07-14 | 2010-06-03 | A123 Systems, Inc. | Prismatic Cell With Outer Electrode Layers Coated On A Single Side |
KR20140062568A (ko) * | 2012-11-12 | 2014-05-26 | 주식회사 엘지화학 | 상하 대칭 구조를 갖는 전극 조립체, 상기 전극 조립체를 포함하는 이차 전지, 전지팩 및 디바이스 |
JP2016152170A (ja) * | 2015-02-18 | 2016-08-22 | 日立オートモティブシステムズ株式会社 | 角形二次電池及びその製造方法 |
KR20180100526A (ko) * | 2015-03-18 | 2018-09-11 | 도요타지도샤가부시키가이샤 | 비수 전해질 이차 전지 |
KR20190050928A (ko) * | 2017-11-03 | 2019-05-14 | 어드밴스드 배터리 컨셉츠, 엘엘씨 | 바이폴라 배터리 조립체 |
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JP2024520715A (ja) | 2024-05-24 |
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KR20230143300A (ko) | 2023-10-12 |
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