WO2011002064A1 - Batterie stratifiée - Google Patents

Batterie stratifiée Download PDF

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Publication number
WO2011002064A1
WO2011002064A1 PCT/JP2010/061266 JP2010061266W WO2011002064A1 WO 2011002064 A1 WO2011002064 A1 WO 2011002064A1 JP 2010061266 W JP2010061266 W JP 2010061266W WO 2011002064 A1 WO2011002064 A1 WO 2011002064A1
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WIPO (PCT)
Prior art keywords
positive electrode
negative electrode
external terminal
negative
positive
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PCT/JP2010/061266
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English (en)
Japanese (ja)
Inventor
川合徹夫
有島康夫
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日立マクセル株式会社
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Publication of WO2011002064A1 publication Critical patent/WO2011002064A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • 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
    • 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
    • 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
    • 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
    • H01M50/564—Terminals characterised by their manufacturing process
    • H01M50/566—Terminals characterised by their manufacturing process by welding, soldering or brazing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present invention relates to a laminated battery including a laminated electrode body having a large number of layers and a wound electrode body having a large number of turns.
  • the electrode is made thinner and the electrode reaction area is increased. It is effective.
  • Examples of the large battery include a battery using a laminated electrode body in which a positive electrode having a positive electrode mixture layer on the surface of a current collector and a negative electrode having a negative electrode mixture layer on the surface of the current collector are stacked via a separator. In some cases, the number of stacked positive and negative electrodes is increased (for example, Patent Document 1). Also, a battery using a wound electrode body in which a positive electrode having a positive electrode mixture layer on the surface of a current collector and a negative electrode having a negative electrode mixture layer on the surface of the current collector are stacked with a separator and wound in a spiral shape. In the case of (2), an example in which the number of windings is increased is mentioned (for example, Patent Document 2).
  • the large battery often uses a laminate film outer package made of a metal laminate film because of its advantage of high degree of freedom in shape and light weight.
  • the current collection from the electrode of the battery as described above is to make a part of the current collector a plain part without forming a positive electrode mixture layer or a negative electrode mixture layer, and such a point as a current collecting tab and an external terminal.
  • the connection is performed by welding (ultrasonic welding or the like).
  • the thickness of the electrode body inevitably increases. Therefore, the current collecting tab related to the electrode having a distance from the external terminal needs to be routed over a long distance for connection to the external terminal, and in this case, a large tension is applied to the current collecting tab, resulting in damage. There is a fear. For this reason, usually, measures are taken to reduce the tension applied to the current collecting tab by, for example, drawing the current collecting tab along the electrode end face. In this case, however, the current collecting tab is very long. As a result, the internal resistance of the battery increases.
  • a large number of current collecting tabs are stacked and welded to an external terminal. The reliability of the welded portion between the tab and the external terminal is also lowered.
  • the present invention has been made in view of the above circumstances, and includes a laminated electrode body with a large number of laminated layers and a wound electrode body with a large number of turns, has high reliability, and has a high degree of freedom in the position where an external terminal is drawn out.
  • a laminated battery is provided.
  • the laminate type battery of the present invention is a laminate type battery comprising an electrode body formed by laminating a positive electrode and a negative electrode with a separator interposed therebetween, and a laminate film exterior body containing the electrode body, wherein the electrode body Comprises a plurality of positive electrode tabs and a plurality of negative electrode tabs, and the plurality of positive electrode tabs are divided into a plurality of sets to form a plurality of positive electrode tab laminates, and the plurality of negative electrodes The tabs are divided into a plurality of groups and laminated to form a plurality of negative electrode tab laminates, and each of the positive electrode tab laminates is connected to a different positive external terminal, and each of the negative electrode tab laminates Are respectively connected to different negative external terminals, and the positive external terminals and the negative external terminals are electrically connected to each other.
  • FIG. 1 is a plan view schematically showing an example of a laminated battery of the present invention.
  • FIG. 2 is a plan view schematically showing another example of the laminated battery of the present invention.
  • FIG. 3 is an example of a cross-sectional view of an essential part taken along line II in FIG. 1 or line II-II in FIG.
  • FIG. 4 is another example of a cross-sectional view of the main part taken along the line II in FIG. 1 or the line II-II in FIG.
  • the laminated battery of the present invention includes an electrode body formed by laminating a positive electrode and a negative electrode with a separator interposed therebetween, and a laminate film exterior body containing the electrode body.
  • the electrode body includes a plurality of positive electrode tabs and a plurality of negative electrode tabs, and the plurality of positive electrode tabs are divided into a plurality of sets to form a plurality of positive electrode tab laminates,
  • the plurality of negative electrode tabs are divided into a plurality of groups and stacked to form a plurality of negative electrode tab laminates.
  • the positive electrode tab laminates are connected to different positive external terminals
  • the negative tab laminates are connected to different negative external terminals
  • the positive external terminals and the negative external terminals are connected to each other. The two are electrically connected to each other.
  • the laminated battery of the present invention can provide a laminated battery having high reliability and a high degree of freedom in the position where the external terminal is pulled out by having the above-described configuration.
  • FIG. 1 is a plan view schematically showing an example of a laminated battery of the present invention.
  • the electrode body and the electrolytic solution are accommodated in a rectangular laminated film outer package 2 in a plan view.
  • the positive external terminal 3 and the negative external terminal 4 are drawn from the same side of the laminate film outer package 2.
  • Laminate film outer package 2 is formed of a metal laminate film having a heat-sealing resin layer on the inner surface of the battery. More specifically, for example, two metal laminate films are stacked to form a laminate film exterior body 2, and the outer periphery of the laminate film exterior body 2 is heat-sealed in a state where the electrode body and the electrolytic solution are housed inside. As a result, the inside is sealed.
  • FIG. 2 is a plan view schematically showing another example of the laminated battery of the present invention.
  • the laminated battery 1 shown in FIG. 2 is the same as the laminated battery shown in FIG. 1 except that the positive electrode external terminal 3 and the negative electrode external terminal 4 are drawn out from the opposite sides of the laminate film outer package 2. It is the same composition.
  • FIG. 3 shows an example of a sectional view taken along the line II in FIG. 1 or the line II-II in FIG.
  • FIG. 3 is an example of a laminated battery 1 having a laminated electrode body in which a plurality of sheet-like positive electrodes 5 and a plurality of sheet-like negative electrodes 6 are laminated via separators 7.
  • each layer of the metal laminate film constituting the laminate film outer package 2 is not distinguished, and the positive electrode mixture layer and the current collector of the sheet-like positive electrode 5, and The negative electrode mixture layer and the current collector of the sheet-like negative electrode 6 are not distinguished.
  • FIG. 4 described later the same applies to FIG. 4 described later.
  • the plurality of sheet-like positive electrodes 5 have a positive electrode mixture layer formed on one side or both sides of the current collector, and a part of the current collector (right end side in FIG. 3). In this way, the positive electrode mixture layer is not formed, and a positive electrode tab is formed, and the positive electrode tabs of each sheet-like positive electrode 5 are divided into two sets and stacked to form positive electrode tab laminates 5a and 5b.
  • the positive electrode tab laminate 5a is connected to the positive electrode external terminal 3a
  • the positive electrode tab laminate 5b is connected to the positive electrode external terminal 3b.
  • the plurality of sheet-like negative electrodes 6 have a negative electrode mixture layer formed on one side or both sides of the current collector, and a negative electrode mixture on a part of the current collector.
  • the agent layer is not formed to be a negative electrode tab, and the negative electrode tabs of each sheet-like negative electrode 6 are divided into two sets and laminated to form two negative electrode tab laminates. Each negative electrode tab laminate is connected to a different negative external terminal.
  • the total number of the sheet-like positive electrode and the sheet-like negative electrode in the laminated electrode body is 20 or more.
  • the positive and negative current collecting tabs may be damaged when connected to external terminals (welding), and the connection between the current collecting tabs and external terminals may be insufficient. Reliability degradation can occur.
  • a positive electrode tab laminate in which a plurality of sheet-like positive electrode tabs are laminated is divided into a plurality of pieces, and each positive electrode tab laminate is provided as a separate positive electrode external terminal.
  • the positive electrode external terminals are pulled out to the outside of the laminate film exterior body while being electrically connected to each other at least either inside or outside of the laminate film exterior body by connecting and overlapping each positive electrode external terminal.
  • the negative electrode tab laminate in which the negative electrode tabs are laminated is divided into a plurality of sheet-like negative electrodes, and each negative electrode tab laminate is divided into a separate negative electrode.
  • the laminated battery of the present invention while increasing the number of electrodes related to the laminated electrode body, in one positive electrode tab laminated body or one negative electrode tab laminated body, the number of laminated positive electrode tabs and negative electrode tabs is reduced, and The number of positive electrode tabs and the number of negative electrode tabs connected to one positive electrode external terminal or one negative electrode external terminal can be reduced. Therefore, the welding strength between the positive electrode tab laminate and the positive electrode external terminal and the welding strength between the negative electrode tab laminate and the negative electrode external terminal can be increased, and the electrical connection therebetween can be improved.
  • the distance between the sheet-like positive electrode and the positive electrode external terminal and the distance between the sheet-like negative electrode and the negative electrode external terminal are shortened as much as possible. It is possible to suppress damage during battery manufacturing and increase in resistance due to the long tab distance. In the laminated battery of the present invention, high reliability can be secured by these actions.
  • a plurality of positive electrode external terminals and negative electrode external terminals are used, and each of them is electrically connected to at least one of the inside and the outside of the laminate film exterior body.
  • each positive electrode external terminal and each negative electrode external terminal A method of superposing each inside a laminate film outer package is mentioned.
  • Each positive external terminal is overlapped inside the laminate film exterior body, and each negative electrode external terminal is overlapped inside the laminate film exterior body, and these are pulled out from the laminate film exterior body, for example, in plan view 1, that is, for example, without increasing the lateral length of the positive electrode external terminal or the negative electrode external terminal shown in FIG. 1, the total cross-sectional area of the positive electrode external terminal or the total cross-sectional area of the negative electrode external terminal Can be increased.
  • the laminate type battery of the present invention as described above, for example, in a plan view of the positive external terminal and the negative external terminal, by selecting the electrical connection method between the positive external terminals and the electrical connection method between the negative external terminals. Without increasing the width, the total cross-sectional area of the positive external terminal and the total cross-sectional area of the negative external terminal can be increased and, as described above, welded to one positive external terminal or one negative external terminal. Since the number of stacked positive electrode tab laminates and negative electrode tab laminates can be reduced, the reliability of the welded portion can be improved. Therefore, the laminated battery of the present invention can discharge a large current and has a high degree of freedom in the position where the external terminal is drawn from the laminated film outer package without impairing high reliability.
  • the number of positive electrode tab laminates and negative electrode tab laminates may be plural and is at least 2 but usually 5 or less and 4 or less. Preferably, it is 3 or less. In consideration of the reliability of the weld location, the number of positive electrode tabs in one positive electrode tab laminate is preferably 5 to 60, and the number of negative electrode tabs in one negative tab laminate is 5 Preferably it is ⁇ 60.
  • FIG. 4 shows another example of a cross-sectional view of the main part taken along the line II in FIG. 1 or the line II-II in FIG.
  • FIG. 4 shows a wound electrode body (with a transverse cross section) in which a continuous sheet-like positive electrode 5 and a continuous sheet-like negative electrode 6 are laminated via a separator 7 and wound in a spiral shape.
  • This is an example of a laminated battery 1 having a substantially oval wound electrode body.
  • the substantially oval wound electrode body includes an oval wound electrode body.
  • FIG. 4 in order to facilitate understanding of each component, between the laminate film outer package 2 and the outermost peripheral portion (positive electrode current collector 51) of the wound electrode body, and the winding center of the wound electrode body. A gap is made in the portion (negative electrode current collector 61).
  • the sheet-like positive electrode 5 has a positive electrode mixture layer formed on one side or both sides of the current collector, and the end in the width direction of the current collector (the right end side in FIG. 4). )
  • the plurality of positive electrode tabs are laminated in two sets on the substantially oval flat portion of the wound electrode body to form a positive electrode tab laminate. 5a and 5b are formed.
  • the positive electrode tab laminate 5a is connected to the positive electrode external terminal 3a
  • the positive electrode tab laminate 5b is connected to the positive electrode external terminal 3b.
  • the sheet-like negative electrode 6 has a negative electrode mixture layer formed on one side or both sides of the current collector, and the current collector is opposite to the positive electrode tab.
  • a plurality of negative electrode tabs are formed without forming a negative electrode mixture layer at the end in the width direction, and the plurality of negative electrode tabs are divided into two sets and stacked in a substantially oval flat portion of the wound electrode body.
  • two negative electrode tab laminates are formed. Each negative electrode tab laminate is connected to a different negative external terminal.
  • the outermost peripheral portion is a sheet-like positive electrode (positive electrode current collector 51 in which a positive electrode mixture layer is not formed), and the winding center portion is a sheet-like negative electrode ( A negative electrode current collector 61) in which a negative electrode mixture layer is not formed.
  • the number of turns in the wound electrode body is 10 or more, and also in this case, in the case of the battery having the laminated electrode body having a large number of layers.
  • the positive electrode tab laminate in which the positive electrode tabs of the sheet-like positive electrode are laminated is divided into a plurality of parts, and each positive electrode tab laminate is divided into a separate positive electrode external
  • the positive external terminals are electrically connected to each other at least one of the inside and the outside of the laminate film exterior body and pulled out to the outside of the laminate film exterior body.
  • the negative electrode tab laminated body in which the negative electrode tabs are laminated is divided into a plurality of pieces, and each negative electrode tab laminated body is separated from each other.
  • the negative electrode external terminals are connected to each other, and the respective negative electrode external terminals are overlapped, so that the negative electrode external terminals are electrically connected to each other at least one of the inside and the outside of the laminate film exterior body. Pull out to the outside. Therefore, as in the case of a battery having a laminated electrode body, it is possible to discharge a large current and to increase the degree of freedom in the position of drawing out an external terminal from the laminate film exterior body while ensuring high reliability.
  • the number of positive electrode tab laminates and negative electrode tab laminates may be plural, as in the case of a battery having a laminated electrode body, and is at least 2 or more. However, it is usually 5 or less, preferably 4 or less, and more preferably 3 or less. In consideration of the reliability of the weld location, the number of positive electrode tabs in one positive electrode tab laminate is preferably 5 to 60, and the number of negative electrode tabs in one negative tab laminate is 5 Preferably it is ⁇ 60.
  • the method of overlapping both inside and outside of the laminate film outer package is a stable connection part. Although it is preferable from a viewpoint of property, it may be electrically connected by overlapping only inside the laminated film outer package or only outside the laminated body.
  • a plurality of positive external terminals and a plurality of negative external terminals are arranged so as to be arranged side by side in a plan view without overlapping each other, and at least one of the inside and the outside of the laminated film exterior body, each via a lead body etc.
  • the positive external terminal and each negative external terminal may be electrically connected to each other.
  • the positive electrode external terminal and the negative electrode external terminal in the laminated battery of the present invention may be taken out from different sides of the outer periphery of the laminate film outer package, respectively, but a plurality of stacked positive electrodes
  • the external terminal and the plurality of stacked negative electrode external terminals may be drawn to the outside from the same side of the laminate film exterior body.
  • a plurality of positive external terminals are stacked and a plurality of negative external terminals are stacked as shown in FIG.
  • the positive electrode external terminal 3 connected in this manner and the negative electrode external terminal 4 connected in a stacked manner are drawn out from the same side of the laminate film outer package. It is advantageous to increase the energy density by reducing the area of the heat seal portion around the outside.
  • the side where the external terminal of the laminate film outer body is taken out is normally formed with a heat seal portion wider than the side where the external terminal is not taken out so that the sealing performance does not deteriorate, and the positive external terminal and the negative external terminal Are pulled out from the same side of the laminate film outer package, the overall area of the heat seal portion can be reduced.
  • the positive electrode external terminal connected in a stacked manner and the negative electrode external member connected in a stacked manner are connected. It is more preferable that the terminal is drawn out from the other side of the laminated film outer package, and as shown in FIG. 2, the side where the positive electrode external terminal 3 in the rectangular laminated film outer package is drawn out to the outside. More preferably, the negative electrode external terminal 4 is led out to the outside from the side opposite to.
  • the sheet-like positive electrode constituting the laminate type battery of the present invention includes, for example, a layer (positive electrode mixture layer) made of a positive electrode mixture containing a positive electrode active material, a conductive additive and a binder, on one side or both sides of a current collector. Can be used.
  • the positive electrode active material for example, when the laminated battery of the present invention is a lithium ion secondary battery, an active material capable of occluding and releasing lithium ions is used.
  • a positive electrode active material for example, a layered structure represented by Li 1 + x MO 2 ( ⁇ 0.1 ⁇ x ⁇ 0.1, M: Co, Ni, Mn, Al, Mg, etc.) Lithium-containing transition metal oxide, LiMn 2 O 4 and spinel-type lithium manganese oxide obtained by substituting some of its elements with other elements, LiMPO 4 (M: Co, Ni, Mn, Fe, etc.) Type compounds and the like.
  • lithium-containing transition metal oxide having a layered structure examples include LiCoO 2 and LiNi 1-x Co xy Al y O 2 (0.1 ⁇ x ⁇ 0.3, 0.01 ⁇ y ⁇ 0. 2) and other oxides containing at least Co, Ni and Mn (LiMn 1/3 Ni 1/3 Co 1/3 O 2 , LiMn 5/12 Ni 5/12 Co 1/6 O 2 , LiNi 3 / 5 Mn 1/5 Co 1/5 O 2 etc.).
  • the positive electrode current collector an aluminum foil or an aluminum alloy foil is suitable.
  • the thickness of the positive electrode current collector is preferably 0.01 to 0.02 mm, for example, although it depends on the size and capacity of the battery.
  • PVDF polyvinylidene fluoride
  • a paste-like or slurry-like composition uniformly dispersed using a solvent such as N-methyl-2-pyrrolidone (NMP) is prepared, and this composition is applied onto a positive electrode current collector and dried.
  • NMP N-methyl-2-pyrrolidone
  • the binder may be dissolved in a solvent.
  • the manufacturing method of the positive electrode according to the present invention is not limited to the above method, and other methods may be adopted.
  • the thickness of the positive electrode mixture layer in the sheet-like positive electrode is preferably 30 to 100 ⁇ m per side.
  • the content of each component in the positive electrode mixture layer is preferably positive electrode active material: 90 to 98% by mass, conductive assistant: 1 to 5% by mass, and binder: 1 to 5% by mass.
  • the positive electrode external terminal used in the laminated battery of the present invention is preferably made of aluminum or an aluminum alloy from the viewpoint of ease of connection with the equipment used.
  • the thickness per one positive electrode external terminal is preferably 50 ⁇ m or more. That is, by setting the thickness of the positive external terminal to 50 ⁇ m or more, it is possible to prevent cutting during welding of the positive external terminal and to prevent tearing due to pulling and bending.
  • the thickness of each positive electrode external terminal is preferably 300 ⁇ m or less, and the total thickness (total thickness of all positive electrode external terminals) is preferably 600 ⁇ m or less. It is possible to prevent a gap in the thickness direction from occurring in the heat seal portion of the exterior body.
  • the positive electrode external terminals may be heat-sealed via an adhesive layer 8, and the positive electrode external terminal may be a laminate film, for example.
  • the adhesive layer 8 may be provided in advance at a location that is scheduled to be located in the heat seal portion of the exterior body.
  • the metal laminate film constituting the laminate film exterior body has the same kind of resin as the constituent resin (thermal fusion resin) of the thermal fusion resin layer provided on the inner surface of the battery. preferable.
  • the sheet-like positive electrode and the positive electrode external terminal may be connected by directly connecting a positive electrode tab (positive electrode tab laminate) constituted by a sheet-shaped positive electrode current collector and a positive electrode external terminal.
  • the positive electrode tab (positive electrode tab laminate) of the sheet-like positive electrode and the positive electrode external terminal can be connected via an aluminum lead body.
  • the thickness of the aluminum lead body is preferably 50 to 300 ⁇ m, like the positive external terminal.
  • Such a lead body is preferably used when the aluminum foil as the positive electrode current collector is particularly thin and the strength is insufficient for direct connection with the positive electrode external terminal.
  • Examples of the method of connecting the positive electrode tab (positive electrode tab laminate) in the sheet-like positive electrode or the aluminum lead body connected to the positive electrode tab and the positive electrode external terminal include resistance welding, ultrasonic welding, laser welding, caulking, Various methods such as a method using a conductive adhesive can be adopted, but ultrasonic welding is particularly suitable.
  • the laminated battery of the present invention for example, when the laminated battery of the present invention is a lithium ion secondary battery, one containing an active material capable of inserting and extracting lithium ions is used.
  • examples of such negative electrode active materials include lithium ions such as graphite, pyrolytic carbons, cokes, glassy carbons, organic polymer compound fired bodies, mesocarbon microbeads (MCMB), and carbon fibers.
  • lithium ions such as graphite, pyrolytic carbons, cokes, glassy carbons, organic polymer compound fired bodies, mesocarbon microbeads (MCMB), and carbon fibers.
  • MCMB mesocarbon microbeads
  • One type or a mixture of two or more types of carbon-based materials that can be occluded and released are used.
  • lithium metal such as an element such as Si, Sn, Ge, Bi, Sb, In and an alloy thereof, lithium-containing nitride, or lithium oxide
  • lithium metal or lithium / aluminum alloy can also be used as the negative electrode active material.
  • Conductive aids carbon materials and the like exemplified as the conductive aid for the positive electrode
  • binders mixed binders of rubber binders such as PVDF and styrene butadiene rubber (SBR)) and carboxymethyl cellulose (CMC) Etc.] or the like
  • a negative electrode mixture prepared by appropriately forming a molded body (negative electrode mixture layer) using the current collector as a core material, or laminating the above-mentioned various alloys and lithium metal foils on the surface of the current collector A thing etc. are used as a sheet-like negative electrode.
  • a negative electrode mixture containing the negative electrode active material, the binder, and a conductive auxiliary agent such as graphite, acetylene black, and carbon black if necessary, A paste-like or slurry-like composition uniformly dispersed using a solvent such as NMP is prepared, and this composition is applied onto a negative electrode current collector and dried, and if necessary, a negative electrode mixture is obtained by pressing.
  • a method of adjusting the thickness and density of the layer can be employed.
  • the binder may be dissolved in a solvent.
  • the method for producing the sheet-like negative electrode according to the present invention is not limited to the above method, and other methods may be adopted.
  • the current collector for the negative electrode a copper foil is suitable.
  • the thickness of the negative electrode current collector is preferably 0.05 to 0.02 mm, for example, although it depends on the size and capacity of the battery.
  • the thickness of the negative electrode mixture layer in the sheet-like negative electrode is preferably 30 to 100 ⁇ m per side.
  • the content of each component in the negative electrode mixture layer is preferably 90 to 98% by mass of the negative electrode active material and 1 to 5% by mass of the binder. Further, when a conductive additive is used for the negative electrode, the content of the conductive additive in the negative electrode mixture layer is preferably 1 to 5% by mass.
  • the negative electrode external terminal used in the laminated battery of the present invention nickel, nickel-plated copper, nickel-copper clad metal plate, foil, ribbon or the like is preferable. Moreover, it is preferable that the thickness per said negative electrode external terminal is 50 micrometers or more similarly to a positive electrode external terminal. That is, by setting the thickness of the negative electrode external terminal to 50 ⁇ m or more, it is possible to prevent cutting during welding of the negative electrode external terminal and to prevent tearing due to pulling and bending.
  • the thickness of each negative external terminal is preferably 300 ⁇ m or less, and the total thickness (total The total thickness of the negative external terminals) is preferably 600 ⁇ m or less.
  • the adhesive layer 9 may be provided in advance at a location that is scheduled to be located in the heat seal portion of the laminate film exterior body.
  • the metal laminate film constituting the laminate film exterior body is a constituent resin (thermal fusion resin) of the heat fusion resin layer on the inner surface of the battery. Those having the same type of resin as the resin) are preferred.
  • the connection between the sheet-like negative electrode and the negative electrode external terminal may be performed by directly connecting the negative electrode tab (negative electrode tab laminate) constituted by the sheet-like negative electrode current collector and the negative electrode external terminal.
  • the negative electrode tab (negative electrode tab laminate) of the sheet-like negative electrode and the negative electrode external terminal can be connected via a copper lead body.
  • the thickness of the copper lead body is preferably 50 to 300 ⁇ m, like the negative electrode external terminal.
  • Such a lead body is preferably used when the copper foil as the negative electrode current collector is particularly thin and the strength is insufficient for direct connection with the negative electrode external terminal.
  • connection method between the negative electrode tab (negative electrode tab laminate) or the copper lead connected to the negative electrode tab and the negative electrode external terminal in the sheet negative electrode examples include resistance welding, ultrasonic welding, laser welding, caulking, and conductive. Various methods such as a method using an adhesive may be employed, but ultrasonic welding is particularly suitable.
  • Examples of the separator used in the laminate type battery of the present invention include polyethylene, polypropylene, a fusion of polyethylene and polypropylene, a porous film made of polyethylene terephthalate, polybutylene terephthalate, and the like, and a nonwoven fabric.
  • the thickness of the separator is preferably 10 to 50 ⁇ m, and the porosity is preferably 30 to 70%.
  • the effect which prevents a short circuit can be improved and the reliability of a battery can be improved more by using several separators, such as overlapping a porous film and a nonwoven fabric.
  • the laminated battery of the present invention when the laminated battery of the present invention is a lithium ion secondary battery, for example, ethylene carbonate (EC), propylene carbonate (PC), ⁇ -butyrolactone (BL), etc.
  • Dissolve solutes such as LiPF 6 and LiBF 4 in high dielectric constant solvents and organic solvents such as linear solvents such as dimethyl carbonate (DMC), diethyl carbonate (DEC), and methyl ethyl carbonate (EMC).
  • Solution non-aqueous electrolyte
  • PVDF a rubber-based material, an alicyclic epoxy, an oxetane-based material having a three-dimensional cross-linked structure, or the like may be mixed and solidified into the above solution to obtain a polymer electrolyte.
  • the laminate film exterior body of the laminate type battery of the present invention is composed of a metal laminate film.
  • a metal laminate film having a three-layer structure composed of an exterior resin layer / a metal layer / a heat-welding resin layer is used.
  • the exterior resin layer in the metal laminate film can be formed from, for example, a nylon film (nylon 66 film, etc.), a polyester film (PET film, etc.), and the metal layer can be formed from, for example, an aluminum film, a stainless steel film, or the like.
  • the heat-weldable resin layer can be formed from, for example, a modified polyolefin film (such as a modified polyolefin ionomer film).
  • the exterior resin layer preferably has a thickness of 20 to 100 ⁇ m
  • the metal layer preferably has a thickness of 10 to 150 ⁇ m
  • the heat-fusible resin layer has a thickness of 20 to It is preferable that it is 100 micrometers.
  • the shape is not particularly limited, and if necessary, in plan view, such as a triangle, quadrangle, pentagon, hexagon, heptagon, octagon, etc. Although various shapes can be taken, a quadrangle (rectangle or square) is common in plan view. However, in the case of a battery having a wound electrode body, a rectangular laminate film exterior body is used in plan view.
  • Example 1 ⁇ Preparation of positive electrode> 96 parts by mass of LiCoO 2 as a positive electrode active material, 2 parts by mass of acetylene black as a conductive additive, and 2 parts by mass of PVDF as a binder were mixed, and NMP was further added to prepare a positive electrode mixture-containing paste. .
  • the obtained positive electrode mixture-containing paste was applied to both surfaces of a current collector made of an aluminum foil having a thickness of 15 ⁇ m, dried, and then subjected to a press treatment to form a positive electrode mixture layer, whereby a sheet-like positive electrode was obtained. .
  • the thickness of the positive electrode mixture layer of the obtained sheet-like positive electrode was 60 ⁇ m per one side of the current collector.
  • the obtained sheet-like positive electrode was cut into a shape in which a portion where the positive electrode mixture layer was formed had a width of 105 mm and a length of 200 mm, and also included an exposed portion of a positive electrode current collector that became a positive electrode tab.
  • a negative electrode active material-containing paste was prepared by adding and mixing SBR: 1.5 parts by mass and CMC: 0.5 parts by mass to graphite: 98 parts by mass of the negative electrode active material and further adding water.
  • the obtained negative electrode mixture-containing paste was applied to both sides of a current collector made of a copper foil having a thickness of 10 ⁇ m, dried, and then subjected to a press treatment to form a negative electrode mixture layer, whereby a sheet-like negative electrode was obtained. .
  • the thickness of the negative electrode mixture layer of the obtained sheet-like negative electrode was 60 ⁇ m per one side of the current collector.
  • the obtained sheet-like negative electrode was cut into a shape in which a portion where the negative electrode mixture layer was formed had a width of 110 mm and a length of 205 mm, and also included an exposed portion of a negative electrode current collector that became a negative electrode tab.
  • the positive electrode tab related to the sheet-shaped positive electrode and the negative electrode tab related to the sheet-shaped negative electrode were arranged to be located on the same side. Further, both ends of the laminated electrode body were laminated so as to be negative electrodes.
  • the positive electrode tab laminate in which the positive electrode tabs for the upper 25 sheets are stacked is ultrasonically welded to the positive electrode external terminal, and the lower 25 positive electrode tabs are stacked.
  • the positive electrode tab laminate was ultrasonically welded to another positive electrode external terminal.
  • the negative electrode tab laminated body in which the negative electrode tabs for the upper 25 sheets were stacked was ultrasonically welded to the negative electrode external terminal, and the negative electrode tabs for the lower 26 sheets were stacked.
  • the negative electrode tab laminate was ultrasonically welded to another negative electrode external terminal.
  • Two aluminum plates with a length of 30 mm, a width of 20 mm, and a thickness of 0.2 mm were used for the positive electrode external terminal, and two copper plates with a length of 30 mm, a width of 20 mm, and a thickness of 0.2 mm were used for the negative electrode external terminal. Used.
  • the positive electrode external terminals and the negative electrode external terminals were overlapped and electrically connected by welding the entire surfaces in contact with each other using an ultrasonic welding machine.
  • the positive electrode external terminal and the negative electrode external terminal have a resin constituting the heat-weldable resin layer of the laminate film exterior body on both surfaces of the location that is expected to be located in the heat seal portion of the laminate film exterior body described below.
  • An adhesive layer composed of the same modified polyolefin was disposed.
  • the laminated electrode body on the modified polyolefin layer in one metal laminate film a part of the positive external terminal and a part of the negative external terminal protrude from the same side of the metal laminate film as shown in FIG.
  • the modified polyolefin layer side of the other metal laminate film is placed on top of it, and the three sides where the external terminals are not exposed are heat-sealed to form a laminate film outer package, which is vacuumed at 70 ° C. for 15 hours. Dried. Thereafter, a non-aqueous electrolyte was injected from one side of the laminate film outer package that was not sealed, and one side that was not sealed was heat-sealed in a reduced pressure state to obtain a laminated lithium ion secondary battery.
  • non-aqueous electrolyte a solution in which LiPF 6 was dissolved at a concentration of 1.0 mol / L in a solvent in which EC and DEC were mixed at a volume ratio of 1: 3 was used.
  • the width of the heat seal of the laminate film outer package was 10 mm.
  • the laminated lithium ion secondary battery is aged for 24 hours, then charged for 1 hour at a current value of 0.1 C, and then constant current-constant voltage charging (constant current charging: The chemical conversion treatment was performed by carrying out 0.5C, constant voltage charging: 4.2V).
  • Example 2 In the same manner as in Example 1, a positive electrode mixture layer was formed on both surfaces of the positive electrode current collector, had a width of 200 mm, had an exposed portion of the positive electrode current collector serving as a positive electrode tab at one end in the width direction, and was long A long sheet-like positive electrode having a length of 6 m having an exposed portion of the positive electrode current collector at both ends in the scale direction was produced.
  • a negative electrode mixture layer is formed on both surfaces of the negative electrode current collector, the width is 205 mm, the exposed portion of the negative electrode current collector serving as a negative electrode tab is provided at one end in the width direction, and A long sheet-like negative electrode having a length of 6.1 m having an exposed portion of the negative electrode current collector at both ends in the scale direction was produced.
  • One sheet-like positive electrode and one sheet-like negative electrode are passed through a polyolefin microporous film having a thickness of 25 ⁇ m as a separator, and a positive electrode tab relating to the sheet-like positive electrode and a negative electrode tab relating to the sheet-like negative electrode, However, they were overlapped so as to be on the other end face side of the electrode body and wound in a spiral shape (the number of windings was 25) and crushed to obtain a wound electrode body having a substantially oval cross section.
  • the positive electrode tab stack in which one positive electrode tab is stacked in the minor axis direction with the major axis in the cross section of the wound electrode body sandwiched therebetween.
  • the body was ultrasonically welded to the positive electrode external terminal, and a positive electrode tab laminate in which the other 25 positive electrode tabs were stacked in the minor axis direction was ultrasonically welded to another positive electrode external terminal.
  • a negative electrode tab laminate in which 25 negative electrode tabs are stacked in the minor axis direction with the major axis in the cross section of the wound electrode body interposed therebetween. was welded ultrasonically to the negative electrode external terminal, and a negative electrode tab laminate in which the other 26 negative electrode tabs were stacked in the minor axis direction was ultrasonically welded to another negative electrode external terminal.
  • the positive electrode external terminal and negative electrode external terminal as those used in Example 1 were used, and each positive external terminal and each negative external terminal were electrically connected in the same manner as in Example 1.
  • the positive electrode external terminal and the negative electrode external terminal include a resin that forms a heat-welding resin layer of the laminate film exterior body on both sides of a location that is expected to be located in the heat seal portion of the laminate film exterior body.
  • An adhesive layer composed of the same modified polyolefin was disposed.
  • a laminated lithium ion secondary battery was produced in the same manner as in Example 1 except that the above wound electrode body was used in place of the laminated electrode body, and the lead-out positions of the positive and negative external terminals were as shown in FIG. .
  • Example 3 It is composed of the same modified polyolefin as the resin that constitutes the heat-welding resin layer of the laminate film exterior body on both surfaces of the positive electrode external terminal and the negative electrode external terminal that are planned to be located in the heat seal portion of the laminate film exterior body.
  • a laminated lithium ion secondary battery was produced in the same manner as in Example 1 except that no adhesive layer was provided.
  • the positive electrode tab laminate in which 25 positive electrode tabs are stacked in the short axis direction across the major axis in the cross section of the wound electrode body, and the other A positive electrode tab laminated body in which 25 positive electrode tabs are stacked in the minor axis direction is disposed on different surfaces of the same positive electrode external terminal as one positive electrode external terminal used in Example 1, and ultrasonic waves Welded.
  • a negative electrode tab laminate in which the other 26 negative electrode tabs are stacked in the minor axis direction are arranged on different surfaces of the same negative electrode external terminal as the one negative electrode external terminal used in Example 1.
  • a laminated lithium ion secondary battery was produced in the same manner as in Example 2 except that ultrasonic welding was performed.
  • the length of the positive electrode external terminal was changed to 40 mm, and among the positive electrode tabs of the sheet-like positive electrode related to the wound electrode body, one positive electrode tab of 25 sheets was shortened across the major axis in the cross section of the wound electrode body.
  • the positive electrode tab laminated body stacked in the axial direction and the positive electrode tab laminated body obtained by stacking the other 25 positive electrode tabs in the short axis direction are the same as one positive external terminal used in the first embodiment.
  • the positive electrode tab laminate and the negative electrode tab laminate were divided into a plurality of parts, and the positive electrode tab laminate and the negative electrode tab laminate were welded to different external terminals. It can be seen that the positive electrode tab laminate, the negative electrode tab laminate, and the positive and negative external terminals can be welded well, and the internal resistance under each condition is small and has high reliability.
  • the adhesive layer is arranged between the positive electrode external terminal and the negative electrode external terminal and the laminate film outer package, whereas in the battery of Example 3, the adhesive layer is not arranged. .
  • the battery of Example 1 has a smaller increase in internal resistance and the sealing reliability of the laminate film outer package. Is seen to be improved.
  • the reliability of the battery can be further enhanced although there is an increase in cost due to the adhesive layer and an increase in manufacturing steps.
  • the positive electrode tab laminate divided into two parts is welded to another part of one positive external terminal, and the negative electrode divided into two using a long negative external terminal Even in the battery of Comparative Example 3 in which the tab laminate was welded to another portion of one negative electrode external terminal, the positive electrode tab laminate, the negative electrode tab laminate, and the positive and negative external terminals were welded twice each.
  • the positive and negative external terminals have to be lengthened and more welding points have to be taken, the volume of the battery is increased, and the degree of freedom in arranging the external terminals is further reduced.
  • the resistance of the current collecting portion also increased as both the positive and negative electrode tabs and the external terminals became longer.
  • the laminate type battery of the present invention is a conventionally known laminate type battery, particularly a laminate type battery, such as a power source application for various electronic devices, including applications requiring high output and high capacity batteries such as automobile applications. It can be used for the same applications as various applications in which lithium ion secondary batteries are used.

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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)
  • Sealing Battery Cases Or Jackets (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention porte sur une batterie stratifiée qui comprend : un corps d'électrode formé par empilement d'électrodes positives et d'électrodes négatives avec des séparateurs intercalés entre elles ; et un boîtier extérieur en film stratifié, qui contient le corps d'électrode. Le corps d'électrode comprend une pluralité de pattes d'électrode positive et une pluralité de pattes d'électrode négative. La pluralité de pattes d'électrode positive sont divisées en une pluralité de groupes puis empilées l'une sur l'autre, pour former une pluralité de stratifiés de pattes d'électrode positive. La pluralité de pattes d'électrode négative sont divisées en une pluralité de groupes puis empilées l'une sur l'autre, pour former une pluralité de stratifiés de pattes d'électrode négative. Les stratifiés de pattes d'électrode positive respectifs sont connectés à différentes bornes externes d'électrode positive. Les stratifiés de pattes d'électrode négative respectifs sont connectés à différentes bornes externes d'électrode négative. Les bornes externes d'électrode positive sont électriquement connectées l'une à l'autre, et les bornes externes d'électrode négative sont électriquement connectées l'une à l'autre.
PCT/JP2010/061266 2009-07-01 2010-07-01 Batterie stratifiée WO2011002064A1 (fr)

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JP2015512131A (ja) * 2012-04-16 2015-04-23 エルジー・ケム・リミテッド 正極と負極の溶接部位の形状が異なる電極組立体及びそれを含む二次電池
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CN111293268A (zh) * 2018-12-10 2020-06-16 丰田自动车株式会社 电池
CN113381132A (zh) * 2021-06-03 2021-09-10 珠海冠宇电池股份有限公司 一种多极耳电芯和电池
CN113644389A (zh) * 2020-04-27 2021-11-12 北京小米移动软件有限公司 电池模组及其制作方法
CN114094285A (zh) * 2021-11-15 2022-02-25 蜂巢能源科技有限公司 一种单侧极柱长电池及电能存储装置
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JP6678989B2 (ja) 2015-11-12 2020-04-15 株式会社ｅ−Ｇｌｅ 非水電解液二次電池セル及びこれを用いた組電池
JP7108358B2 (ja) * 2017-01-31 2022-07-28 古河電池株式会社 非水電解質二次電池
JP2020149798A (ja) * 2019-03-11 2020-09-17 積水化学工業株式会社 積層型電池および積層型電池の製造方法
JP7412928B2 (ja) 2019-09-09 2024-01-15 セイコーインスツル株式会社 電気化学セル
JP7210519B2 (ja) 2020-10-27 2023-01-23 本田技研工業株式会社 電池セル及び電池モジュール
JP7498994B1 (ja) 2023-06-20 2024-06-13 ＴｅｒａＷａｔｔ Ｔｅｃｈｎｏｌｏｇｙ株式会社 リチウム２次電池

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US9774060B2 (en) 2012-02-07 2017-09-26 Lg Chem, Ltd. Method for manufacturing battery cell of novel structure
JP2015512131A (ja) * 2012-04-16 2015-04-23 エルジー・ケム・リミテッド 正極と負極の溶接部位の形状が異なる電極組立体及びそれを含む二次電池
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CN111293268A (zh) * 2018-12-10 2020-06-16 丰田自动车株式会社 电池
CN111293268B (zh) * 2018-12-10 2022-03-15 丰田自动车株式会社 电池
CN113644389A (zh) * 2020-04-27 2021-11-12 北京小米移动软件有限公司 电池模组及其制作方法
CN114824689A (zh) * 2021-01-20 2022-07-29 Fdk株式会社 层压型蓄电元件
CN114824689B (zh) * 2021-01-20 2024-06-04 Fdk株式会社 层压型蓄电元件
CN113381132A (zh) * 2021-06-03 2021-09-10 珠海冠宇电池股份有限公司 一种多极耳电芯和电池
CN113381132B (zh) * 2021-06-03 2023-03-14 珠海冠宇电池股份有限公司 一种多极耳电芯和电池
CN114094285A (zh) * 2021-11-15 2022-02-25 蜂巢能源科技有限公司 一种单侧极柱长电池及电能存储装置
CN114094285B (zh) * 2021-11-15 2023-06-27 蜂巢能源科技有限公司 一种单侧极柱长电池及电能存储装置

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