WO2023200170A1 - 안전성이 개선된 각형 이차전지 - Google Patents
안전성이 개선된 각형 이차전지 Download PDFInfo
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- WO2023200170A1 WO2023200170A1 PCT/KR2023/004513 KR2023004513W WO2023200170A1 WO 2023200170 A1 WO2023200170 A1 WO 2023200170A1 KR 2023004513 W KR2023004513 W KR 2023004513W WO 2023200170 A1 WO2023200170 A1 WO 2023200170A1
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- 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
- 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
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the 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
- H01M50/55—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
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
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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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
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- 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 prismatic secondary battery with improved safety by preventing internal slip of the electrode assembly.
- 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.
- the positive and negative tabs of the electrode assembly stored in the square secondary battery are respectively bonded to electrode leads and then connected to the positive and negative terminals on the case.
- the case accommodating the electrode assembly has some extra space depending on the space for the electrical connection of the electrode assembly and the required amount of electrolyte to be injected. Therefore, the electrode assembly inside the case may be shaken or slip (slip phenomenon) due to external shock.
- prismatic secondary batteries used in hybrid vehicles or electric vehicles frequently experience slippage due to impacts while driving.
- Structural support of the electrode assembly is mainly provided by the positive and negative tabs (electrode tabs) connected to the positive and negative terminals. For this reason, if a slip phenomenon occurs in the electrode assembly, various problems may occur, such as a short circuit due to electrical contact or stress concentrated on the electrode tab, causing the tab to tear.
- Patent Document 001 Korean Patent No. 10-0929034 (announced on November 20, 2009)
- the purpose of the present invention is to prevent the electrode assembly stored inside a square secondary battery from causing a slip phenomenon during use.
- the present invention relates to a prismatic secondary battery having an electrode assembly having a stack structure in which unit cells are stacked.
- the electrode assembly is electrically connected to each of the positive and negative terminals provided on the case of the prismatic secondary battery. It has a positive electrode tab and a negative electrode tab connected to each other, and a positive electrode dummy tab and a negative electrode dummy tab that are electrically separated from the positive electrode terminal and the negative electrode terminal.
- the anode dummy tab and the cathode dummy tab are fixed to the case and support the electrode assembly.
- the positive terminal and the negative electrode terminal are disposed together on one side of the case, and the positive electrode dummy tab and the negative electrode dummy tab are located on an opposite side facing the side on which the positive terminal and the negative terminal are disposed together. It is fixed.
- each pair of the positive electrode tab, the positive electrode dummy tab, and the negative electrode tab and the negative electrode dummy tab may be aligned to be located on a straight line crossing the one surface and the opposing surface.
- each pair of the positive electrode tab, the positive electrode dummy tab, and the negative electrode tab and the negative electrode dummy tab may be arranged to be offset from each other along a direction crossing the one surface and the opposing surface.
- the positive electrode tab and the negative electrode dummy tab, and each pair of the negative electrode tab and the positive electrode dummy tab may be aligned to be located on a straight line crossing the one surface and the opposite surface.
- the positive electrode terminal and the negative electrode terminal are separately disposed on two opposing sides of the case, the positive electrode dummy tab is fixed to the surface on which the positive terminal is disposed, and the negative electrode terminal is fixed to the surface on which the positive terminal is disposed. A dummy tab is fixed to the surface where the negative terminal is disposed.
- the positive electrode terminal and the negative electrode terminal are separately disposed on two opposite sides of the case, the positive electrode dummy tab is fixed to the surface on which the negative terminal is disposed, and the negative electrode dummy tab is connected to the positive terminal. It may be fixed to the surface on which it is placed.
- the positive electrode dummy tab and the negative electrode dummy tab may be aligned to be located on a straight line crossing the two opposing surfaces.
- one of the positive and negative dummy tabs may be electrically insulated from the case.
- a dummy tab that is electrically insulated from the case may be fixed to an insulator installed on the inner surface of the case.
- the insulator has a tab insertion groove, and the dummy tab can be inserted into and fixed to the tab insertion groove.
- a dummy tab that is not electrically insulated from the case may be welded to the inner surface of the case.
- At least one of the positive electrode dummy tab and the negative electrode dummy tab may be provided in plural numbers.
- the rectangular secondary battery of the present invention having the above configuration includes a positive electrode dummy tab and a negative electrode dummy tab on opposite sides of the positive electrode tab and the negative electrode tab in the electrode assembly, and the positive electrode dummy tab and the negative electrode dummy tab are fixed to the case.
- the electrode assembly is fixed in both directions within the case, improving the support structure.
- the slip phenomenon of the electrode assembly stored inside the square secondary battery during use is suppressed, preventing various problems such as short circuits or tearing of tabs due to electrical contact. By preventing this, the safety of the secondary battery is greatly improved.
- FIG. 1 is a diagram showing the external appearance of a square secondary battery according to an embodiment of the present invention.
- FIG. 2 is a diagram illustrating an electrode assembly stored in the square secondary battery of FIG. 1.
- FIG. 3 is a diagram showing the support structure of the electrode assembly in the square secondary battery of FIG. 1.
- FIG. 4 is a diagram showing another electrode assembly in one embodiment of the present invention.
- FIG. 5 is a diagram showing another electrode assembly in one embodiment of the present invention.
- Figure 6 is a diagram showing the external appearance of a square secondary battery according to another embodiment of the present invention.
- FIG. 7 is a diagram illustrating an electrode assembly stored in the square secondary battery of FIG. 6.
- FIG. 8 is a diagram showing the support structure of the electrode assembly in the square secondary battery of FIG. 6.
- FIG. 9 is a diagram showing another electrode assembly according to another embodiment of the present invention.
- Figure 10 shows another embodiment of a one-way electrode assembly.
- FIG. 11 shows another embodiment of a bidirectional electrode assembly.
- the present invention relates to a prismatic secondary battery having an electrode assembly having a stack structure in which unit cells are stacked.
- the electrode assembly is electrically connected to each of the positive and negative terminals provided on the case of the prismatic secondary battery. It has a positive electrode tab and a negative electrode tab connected to each other, and a positive electrode dummy tab and a negative electrode dummy tab that are electrically separated from the positive electrode terminal and the negative electrode terminal.
- the anode dummy tab and the cathode dummy tab are fixed to the case and support the electrode assembly.
- the rectangular secondary battery of the present invention is provided with a positive electrode dummy tab and a negative electrode dummy tab on opposite sides of the positive electrode tab and the negative electrode tab in the electrode assembly, and the positive electrode dummy tab and the negative electrode dummy tab are fixed to the case. Accordingly, the support structure of the electrode assembly is improved as it is fixed in both directions within the case, and as a result, the slip phenomenon of the electrode assembly stored inside the square secondary battery during use is suppressed, preventing various types of damage, such as short circuits or tearing of tabs due to electrical contact. By preventing problems, the safety of secondary batteries is greatly improved.
- FIG. 1 is a diagram showing the external appearance of a prismatic secondary battery 100 according to a first embodiment of the present invention
- FIG. 2 is a diagram illustrating the electrode assembly 200 stored in the prismatic secondary battery 100 of FIG. 1. am.
- the prismatic secondary battery 100 in the first embodiment relates to a one-way secondary battery in which the positive terminal 120 and the negative terminal 130 are disposed together on one side of the case 110, in the example shown, on the upper side.
- the electrode assembly 200 which has a stack structure in which unit cells are stacked, is sealed and stored in the case 110.
- a unit cell refers to a cell composed of a unit structure of cathode/separator/cathode, and one electrode assembly 200 is formed by stacking a plurality of unit cells. The general configuration of the unit cell is explained as follows.
- the positive electrode includes a positive electrode current collector and a positive electrode active material applied on one or both sides of the positive electrode current collector. At one end of the positive electrode current collector in the width direction, there is an uncoated area where the positive electrode active material is not applied.
- the positive electrode tab 210 is formed by performing notching (punching) processing on the uncoated area.
- the negative electrode includes a negative electrode current collector and a negative electrode active material applied on one or both sides of the negative electrode current collector. At one end of the negative electrode current collector in the width direction, there is an uncoated area where the negative electrode active material is not applied. Likewise, the uncoated portion of the cathode functions as the cathode tab 220.
- the positive electrode tab 210 and the negative electrode tab 220 in the first embodiment are located at the same end along the width direction of the electrode assembly 200, that is, the height direction of the square secondary battery 100.
- the positive electrode tab 210 and the negative electrode tab 220 extend toward the upper surface of the square secondary battery 100, and the positive tab 210 and the negative electrode tab 220 are connected to the case of the square secondary battery 100. It is electrically connected to the positive electrode terminal 120 and the negative terminal 130 provided on (110), respectively.
- the positive electrode active material coated on the positive electrode current collector and the electrode active material coated on the negative electrode current collector can be used without limitation as long as they are active materials known in the art.
- the positive electrode active material has the general formula A[AxMy]O2+z (A includes at least one element of Li, Na, and K; M includes Ni, Co, Mn, Ca, Mg, Al, Ti, Si, Contains at least one element selected from 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 includes an alkali metal compound Contains one or more elements; may be 0 ⁇ x ⁇ 1).
- the positive electrode active material has the general formula LiaM1xFe1xM2yP1yM3zO4z
- M1 includes at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg and Al
- M2 contains at least one element selected from Ti, Si, Mn, Co, Fe, V, Cr, Mo, Ni, Nd, Al, Mg, Al, As, Sb, Si, Ge, V and S
- M3 is F 0 ⁇ a ⁇ 2, 0 ⁇ x ⁇ 1, 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1; included in a, x, y, z, M1, M2, and M3
- the stoichiometric coefficients of the components are chosen such that the compound remains electrically neutral), or Li3M2(PO4)3 [M is from Ti, Si, Mn, Fe, Co, V, Cr, Mo, Ni, Al, Mg and Al. It may be lithium
- the positive electrode active material may include primary particles and/or secondary particles in which primary particles are aggregated.
- the negative electrode active material may be carbon material, lithium metal or lithium metal compound, silicon or silicon compound, tin or tin compound, etc.
- Metal oxides such as TiO2 and SnO2 with a potential of less than 2V can also be used as negative electrode active materials.
- carbon materials both low-crystalline carbon and high-crystalline carbon can be used.
- the separator interposed between the anode and the cathode is a porous polymer film, for example, a polyolefin polymer such as ethylene homopolymer, propylene homopolymer, ethylene/butene copolymer, ethylene/hexene copolymer, ethylene/methacrylate copolymer, etc.
- the porous polymer film prepared can be used alone or by stacking them.
- the separator may be a conventional porous nonwoven fabric, for example, a nonwoven fabric made of high melting point glass fiber, polyethylene terephthalate fiber, etc.
- At least one surface of the separator may include a coating layer of inorganic particles. It is also possible that the separator 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)O3(PZT), Pb1xLaxZr1yTiyO3(PLZT), PB(Mg3Nb2/3)O3PbTiO3(PMNPT), BaTiO3, hafnia(HfO2), SrTiO3, TiO2, Al2O3, It may include at least one material selected from the group consisting of ZrO2, SnO2, CeO2, MgO, CaO, ZnO, and Y2O3.
- the electrolyte that forms the electrolyte solution in which the electrode assembly 200 is impregnated may be a salt having a structure such as A+B-.
- A+ includes alkali metal cations such as Li+, Na+, and K+, or ions made of a combination thereof.
- B- is F-, Cl-, Br-, I-, NO3-, N(CN)2-, BF4-, ClO4-, AlO4-, AlCl4-, PF6-, SbF6-, AsF6-, BF2C2O4-, BC4O8-, (CF3)2PF4-, (CF3)3PF3-, (CF3)4PF2-, (CF3)5PF-, (CF3)6P-, CF3SO3-, C4F9SO3-, CF3CF2SO3-, (CF3SO2)2N-, (FSO2) )2N-, CF3CF2(CF3)2CO-, (CF3SO2)2CH-, (SF5)3C-, (CF3SO2)3C-, CF3(CF2)7SO3-, CF3CO2-, CH3CO2-, SCN- and (CF3CF2SO2)2N- It contains one or more anions selected from the group consisting of.
- 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
- the electrode assembly 200 in the first embodiment is electrically connected to the positive electrode terminal 120 and the negative terminal 130 provided on the case 110 of the square secondary battery 100, respectively.
- a positive electrode tab 210 and a negative electrode tab 220 are provided, and a positive electrode dummy tab 230 and a negative electrode dummy tab 240 are electrically separated from the positive electrode terminal 120 and the negative electrode terminal 130. do.
- the positive electrode dummy tab 230 and the negative electrode dummy tab 240 are formed on opposite uncoated areas opposite the uncoated area where the positive electrode tab 210 and the negative electrode tab 220 are formed.
- the positive electrode tab 210 and the negative electrode tab 220 are disposed at opposite ends of the electrode assembly 200, that is, at the top of the electrode assembly 200 in the drawing, while the positive electrode dummy tab 230 and the negative electrode dummy tab 240 are disposed at the bottom of the electrode assembly 200.
- FIG. 3 is a diagram illustrating the support structure of the electrode assembly 200 in the square secondary battery 100 of FIG. 1.
- the positive electrode tab 210 and the negative electrode tab 220 are fixed to the positive terminal 120 and the negative terminal 130 on the upper surface of the case 110 by welding, and the positive electrode dummy tab 230 and the negative electrode are The dummy tab 240 is fixed to the bottom of the case 110.
- both the upper and lower sides of the electrode assembly 200 are fixed to the case 110. More specifically, the positive electrode tab 210, the negative electrode tab 220, and the positive electrode dummy tab 230 and negative electrode dummy tab 240 form a four-point support structure that secures the electrode assembly 200 to the case 110. .
- the four-point support structure is a structure that exerts strong support against external disturbances.
- the electrode assembly 200 supported at four points suppresses the slip phenomenon during use, preventing short circuits or tearing of the electrode tabs 210 and 220 due to electrical contact. Various problems such as these are prevented, and through this, the safety of the square secondary battery 100 is greatly improved.
- the positive electrode dummy tab 230 and the negative electrode dummy tab 240 are formed integrally with the positive and negative electrodes of the electrode assembly 200, when the case 110 has polarity, at least Either dummy tab 230 or 240 needs to be electrically insulated from case 110. That is, when the case 110 is electrically positive, the negative dummy tab 240 must be electrically insulated from the case 110, and conversely, when the case 110 is electrically negative, the positive electrode dummy tab 230 must be electrically insulated from the case 110. This will have to be insulated. Also, since the case 110 is electrically neutral, the dummy tabs 230 and 240 do not necessarily need to be insulated from the case 110.
- FIG. 3 exemplarily shows a case where the case 110 is electrically negative, for example, grounded, and the positive dummy tab 230 is fixed to the insulator 300 installed on the inner surface of the case 110.
- the anode dummy tab 230 fixed to the case 110 via the insulator 300 is electrically separated from the case 110.
- the insulator 300 has a tab insertion groove 310, and the anode dummy tab 230 can be inserted into the tab insertion groove 310 of the insulator 300 and fixed by pressing it.
- the negative electrode dummy tab 240 can also be fixed to the case 110 using the insulator 300, and since it is not necessarily insulated from the electrically negative case 110, the negative electrode dummy tab ( Of course, it is also possible for 240) to be directly welded and fixed to the inner surface of the case 110.
- FIG. 4 is a diagram illustrating another electrode assembly 200 according to an embodiment of the present invention
- FIG. 5 is a diagram illustrating another electrode assembly 200 according to an embodiment of the present invention.
- Figures 4 and 5 show that the arrangement relationship of the positive electrode dummy tab 230 and the negative electrode dummy tab 240 with respect to the positive electrode tab 210 and the negative electrode cap can be configured in various ways, and 4 of the electrode assembly 200 The point support structure remains the same.
- each pair of the positive electrode tab 210, the positive electrode dummy tab 230, and the negative electrode tab 220 and the negative electrode dummy tab 240 are straight lines crossing one side and the opposite side of the electrode assembly 200. , In other words, it is aligned to be located on a straight line crossing the height direction of the case 110 (width direction of the electrode assembly). That is, the positive electrode dummy tab 230 faces the positive electrode tab 210, and the negative electrode dummy tab 240 faces the negative electrode tab 220.
- each pair of the positive electrode tab 210 and the positive electrode dummy tab 230, and the negative electrode tab 220 and the negative electrode dummy tab 240 crosses one side and the opposite side. They are offset from each other along the direction. That is, the electrode assembly 200 of FIG. 4 is one in which the opposing structures of the positive electrode dummy tab 230 and the negative electrode dummy tab 240 with respect to the positive electrode tab 210 and the negative electrode tab 220 are arranged to be offset.
- FIG. 5 is a modification of FIG. 2 in which each pair of the positive electrode tab 210 and the negative electrode dummy tab 240, and the negative electrode tab 220 and the positive electrode dummy tab 230 have one side and the opposite side of the electrode assembly 200. It is aligned so that it lies on a straight line that crosses it. That is, the negative electrode dummy tab 240 faces the positive electrode tab 210, and the positive electrode dummy tab 230 faces the negative electrode tab 220.
- the dummy tab (210) faces each electrode tab (210, 220). It shows that the type (polarity) of 230, 240) is not limited to the embodiment of FIG. 2.
- FIG. 6 is a diagram showing the external appearance of a prismatic secondary battery 100 according to a second embodiment of the present invention
- FIG. 7 is a diagram illustrating the electrode assembly 200 stored in the prismatic secondary battery 100 of FIG. 6. am.
- the second embodiment of the present invention relates to a prismatic secondary battery 100 in which the positive terminal 120 and the negative terminal 130 are separately disposed on two opposing sides of the case 110. , Accordingly, the arrangement of the dummy tabs 230 and 240 of the electrode assembly 200 in which unit cells are stacked is also different from that of the first embodiment.
- the second embodiment of the present invention will be described focusing on the configuration that is different from the above-described first embodiment.
- the positive electrode tab 210 and the negative electrode tab 220 are also arranged separately at both left and right ends of the electrode assembly 200, corresponding to the positive electrode terminal 120 and the negative electrode terminal 130 arranged separately on opposite sides. . Additionally, the positive electrode dummy tab 230 is fixed to the surface on which the positive electrode terminal 120 is disposed, while the negative electrode dummy tab 240 is fixed to the surface on which the negative terminal 130 is disposed.
- the positive electrode tab 210 and the positive electrode dummy tab 230 are disposed together on one side (left side based on the drawing) of the case 110, and the negative electrode tab ( 220 and the negative electrode dummy tab 240 are arranged together on the opposite side (right side in the drawing) of the case 110.
- the positions of the electrode tabs 210 and 220 and the dummy tabs 230 and 240 provided on the electrode assembly 200 are changed, but as shown in FIG.
- the four-point support structure of the electrode assembly 200 is maintained as is, and either the anode dummy tab 230 or the cathode dummy tab 240 (230 or 240) is connected to the case 110.
- FIG. 9 is a diagram showing another electrode assembly 200 in the second embodiment of the present invention.
- the positive electrode dummy tab 230 is fixed to the surface where the negative electrode terminal 130 is disposed, while the negative electrode dummy tab 240 is fixed to the surface where the positive terminal 120 is disposed. That is, in the electrode assembly 200 of FIG. 9, the positive electrode tab 210 and the negative electrode dummy tab 240 are disposed together on one side (left side in the drawing) of the case 110, and the negative electrode tab 220 and the positive electrode dummy tab 240 are disposed together on one side of the case 110 (left side in the drawing).
- the tabs 230 are arranged together on the opposite side (right side in the drawing) of the case 110. In other words, if the four-point support structure of the electrode assembly 200 is maintained, the protruding positions of the positive electrode dummy tab 230 and the negative electrode dummy tab 240 may not be very important.
- the positive electrode dummy tab 230 and the negative electrode dummy tab 240 may be aligned to be positioned on a straight line crossing two opposing surfaces, that is, the two surfaces on which the positive electrode tab 210 and the negative electrode tab 220 are disposed to face each other. there is.
- the positive electrode dummy tab 230 and the negative electrode dummy tab 240 may also be arranged to face each other exactly.
- first and second embodiments described electrode assemblies suitable for application to one-way secondary batteries and two-way secondary batteries, respectively.
- one positive electrode dummy tab and one negative electrode dummy tab are provided. It was explained as an example. However, in order to further strengthen the support structure of the electrode assembly in the square secondary battery, a plurality of dummy tabs may be provided, and the third embodiment relates to this.
- FIG. 10 shows a unidirectional electrode assembly in which the anode tab 210 and the cathode tab 220 are disposed together on the top of the electrode assembly 200.
- the anode dummy tab 230 and the cathode The dummy tabs 240 may be provided in plural numbers (two in the illustrated example).
- the support structure of the electrode assembly 200 can be further strengthened by the plurality of dummy tabs 230 and 240.
- FIG. 11 shows a third embodiment of a bidirectional electrode assembly in which the anode tab 210 and the cathode tab 220 are disposed separately on two opposing surfaces of the electrode assembly 200, where the anode tab A plurality of positive electrode dummy tabs 230 arranged on the same surface as 210 and a plurality of negative electrode dummy tabs 240 arranged on the same surface as the negative electrode tab 220 are provided.
- the configuration of the insulator 300 and the tab insertion groove 310 described in the first and second embodiments can be equally applied to the third embodiment.
- 10 and 11 show that both the anode dummy tab 230 and the cathode dummy tab 240 are provided in plural and in the same number, but this is only an example, and the anode dummy tab 230 ) and the negative electrode dummy tab 240 may be provided in plurality, and the number may also be different.
- Electrode assembly 210 Anode tab
- cathode tab 230 anode dummy tab
- cathode dummy tab 300 insulator
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Abstract
Description
Claims (14)
- 단위 셀이 적층된 스택 구조의 전극 조립체를 구비한 각형 이차전지에 있어서,상기 전극 조립체는,상기 각형 이차전지의 케이스 상에 구비된 양극 단자와 음극 단자에 각각 전기적으로 연결되는 양극 탭 및 음극 탭과,상기 양극 단자와 음극 단자에 대해 전기적으로 분리된 양극 더미 탭과 음극 더미 탭을 구비하는 것을 특징으로 하는 각형 이차전지.
- 제1항에 있어서,상기 양극 더미 탭과 음극 더미 탭은,상기 케이스에 대해 고정되어 상기 전극 조립체를 지지하는 것을 특징으로 하는 각형 이차전지.
- 제2항에 있어서,상기 양극 단자와 음극 단자는 상기 케이스의 일면에 함께 배치되고,상기 양극 더미 탭과 음극 더미 탭은 상기 양극 단자와 음극 단자가 함께 배치된 일면과 마주보는 대향면에 고정되는 것을 특징으로 하는 각형 이차전지.
- 제3항에 있어서,상기 양극 탭과 양극 더미 탭, 그리고 상기 음극 탭과 음극 더미 탭의 각 쌍은 상기 일면과 대향면을 가로지르는 직선 위에 위치하도록 정렬된 것을 특징으로 하는 각형 이차전지.
- 제3항에 있어서,상기 양극 탭과 양극 더미 탭, 그리고 상기 음극 탭과 음극 더미 탭의 각 쌍은 상기 일면과 대향면을 가로지르는 방향을 따라 서로 어긋나게 배치되는 것을 특징으로 하는 각형 이차전지.
- 제5항에 있어서,상기 양극 탭과 음극 더미 탭, 그리고 상기 음극 탭과 양극 더미 탭의 각 쌍은 상기 일면과 대향면을 가로지르는 직선 위에 위치하도록 정렬된 것을 특징으로 하는 각형 이차전지.
- 제2항에 있어서,상기 양극 단자와 음극 단자는 상기 케이스의 서로 대향하는 두 개의 면에 각각 분리되어 배치되고,상기 양극 더미 탭은 상기 양극 단자가 배치되는 면에 고정되는 한편, 상기 음극 더미 탭은 상기 음극 단자가 배치되는 면에 고정되는 것을 특징으로 하는 각형 이차전지.
- 제2항에 있어서,상기 양극 단자와 음극 단자는 상기 케이스의 서로 대향하는 두 개의 면에 각각 분리되어 배치되고,상기 양극 더미 탭은 상기 음극 단자가 배치되는 면에 고정되는 한편, 상기 음극 더미 탭은 상기 양극 단자가 배치되는 면에 고정되는 것을 특징으로 하는 각형 이차전지.
- 제7항 또는 제8항에 있어서,상기 양극 더미 탭과 상기 음극 더미 탭은 상기 두 개의 대향면을 가로지르는 직선 위에 위치하도록 정렬된 것을 특징으로 하는 각형 이차전지.
- 제2항에 있어서,상기 양극 더미 탭과 음극 더미 탭 중 어느 하나의 더미 탭은 상기 케이스에 대해 전기적으로 절연되는 것을 특징으로 하는 각형 이차전지.
- 제10항에 있어서,상기 케이스에 대해 전기적으로 절연되는 더미 탭은, 상기 케이스의 내면에 설치된 절연체에 고정되는 것을 특징으로 하는 각형 이차전지.
- 제11항에 있어서,상기 절연체는 탭 삽입홈을 구비하고,상기 더미 탭은 상기 탭 삽입홈에 삽입되어 고정되는 것을 특징으로 하는 각형 이차전지.
- 제11항에 있어서,상기 케이스에 대해 전기적으로 절연되지 않는 더미 탭은, 상기 케이스의 내면에 용접되는 것을 특징으로 하는 각형 이차전지.
- 제1항에 있어서,상기 양극 더미 탭과 음극 더미 탭 중의 적어도 어느 하나는 복수 개로 구비되는 것을 특징으로 하는 각형 이차전지.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
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| US18/572,115 US20240291117A1 (en) | 2022-04-11 | 2023-04-04 | Prismatic secondary battery having improved safety |
| EP23788522.3A EP4336646A4 (en) | 2022-04-11 | 2023-04-04 | ENHANCED SAFETY PRISMATIC RECHARGEABLE BATTERY |
| JP2023578821A JP7827366B2 (ja) | 2022-04-11 | 2023-04-04 | 安全性が改善された角型二次電池 |
| CN202380012418.1A CN117529846A (zh) | 2022-04-11 | 2023-04-04 | 改进了安全性的方形二次电池 |
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| KR20220044302 | 2022-04-11 | ||
| KR10-2022-0044302 | 2022-04-11 | ||
| KR1020230043523A KR102758611B1 (ko) | 2022-04-11 | 2023-04-03 | 안전성이 개선된 각형 이차전지 |
| KR10-2023-0043523 | 2023-04-03 |
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| PCT/KR2023/004513 Ceased WO2023200170A1 (ko) | 2022-04-11 | 2023-04-04 | 안전성이 개선된 각형 이차전지 |
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| US (1) | US20240291117A1 (ko) |
| EP (1) | EP4336646A4 (ko) |
| JP (1) | JP7827366B2 (ko) |
| KR (1) | KR102839979B1 (ko) |
| WO (1) | WO2023200170A1 (ko) |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP4336646A1 (en) | 2024-03-13 |
| EP4336646A4 (en) | 2025-06-04 |
| KR102839979B1 (ko) | 2025-07-29 |
| KR20240156993A (ko) | 2024-10-31 |
| JP7827366B2 (ja) | 2026-03-10 |
| JP2024524970A (ja) | 2024-07-09 |
| US20240291117A1 (en) | 2024-08-29 |
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