US20020006543A1 - Nonaqueous electrolyte battery - Google Patents

Nonaqueous electrolyte battery Download PDF

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Publication number
US20020006543A1
US20020006543A1 US09/249,502 US24950299A US2002006543A1 US 20020006543 A1 US20020006543 A1 US 20020006543A1 US 24950299 A US24950299 A US 24950299A US 2002006543 A1 US2002006543 A1 US 2002006543A1
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Prior art keywords
electrode
positive
negative
exposed portion
collector
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US09/249,502
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Inventor
Ken Segawa
Shigeru Fujita
Hideaki Ojima
Takashi Tomita
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Sony Corp
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Sony Corp
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Assigned to SONY CORPORATION reassignment SONY CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUJITA, SHIGERU, OJIMA, HIDEAKI, SEGAWA, KEN, TOMITA, TAKASHI
Publication of US20020006543A1 publication Critical patent/US20020006543A1/en
Priority to US10/156,283 priority Critical patent/US7527892B2/en
Abandoned legal-status Critical Current

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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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/48—Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • 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
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • 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
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
    • H01M10/643—Cylindrical cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
    • 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
    • H01M50/30—Arrangements for facilitating escape of gases
    • H01M50/342—Non-re-sealable arrangements
    • 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 nonaqueous electrolyte battery containing nonaqueous solvent as solvent of an electrolyte thereof.
  • a lithium secondary battery containing nonaqueous electrolyte incorporates a positive electrode which is usually constituted by applying, to aluminum foil, metal oxide and the like serving as an active material for the positive electrode.
  • a negative electrode of the battery is constituted by crimping, to copper foil, lithium serving as an active material for the negative electrode.
  • a separator constituted by a finely-porous film made of polyethylene is disposed between the two electrodes obtained as described above.
  • a coil constituted by winding and stacking the obtained structure is accommodated in a can made of stainless steel and serving as an external electrode (for example, an external negative electrode).
  • the above-mentioned lithium secondary battery has characteristics of a large capacity, high voltage and a large output. If the circuit or the like under abnormal conditions causes the positive electrode and the negative electrode of the battery to be short-circuited, the temperature of the battery is undesirably raised. To prevent rise in the temperature of the battery, a variety of protective means, such as a temperature fuse, an electric current fuse and a PTC device are provided for the battery. In addition, a safety valve for preventing rise in the pressure in the battery is provided.
  • an object of the present invention is to provide a nonaqueous electrolyte battery which is capable of minimizing damage thereof even if the battery is crushed by dint of pressure.
  • a nonaqueous electrolyte battery comprising: a spirally coil formed by, through a separator, winding a positive electrode which incorporates an elongated positive-electrode collector having two sides on each of which an active material for the positive electrode has been formed and a negative electrode which incorporates an elongated negative-electrode collector having two sides on each of which an active material for the negative electrode has been formed, wherein the positive electrode has a lengthwise directional end which has two sides each of which is provided with a positive-electrode-collector exposed portion in which a positive-electrode collector is exposed, the negative electrode has a lengthwise directional end which has two sides each of which is provided with a negative-electrode-collector exposed portion in which a negative-electrode collector is exposed, and the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion cover the coil one or more times through the separator
  • the nonaqueous electrolyte battery according to the present invention incorporates the coil covered with the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion. Therefore, even if the battery is crushed with pressure, the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion are first short-circuited.
  • the nonaqueous electrolyte battery according to the present invention enables heat produced by dint of short circuit between the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion to be diffused. Therefore, any critical influence is exerted on the active materials for the electrodes. As a result, damage of the overall body of the battery can be prevented.
  • FIG. 1 is a vertical cross sectional view showing an example of the structure of a nonaqueous electrolyte battery according to the present invention
  • FIG. 2 is a perspective view showing an example of the structure of a positive electrode
  • FIG. 3 is a perspective view showing an example of the structure of a negative electrode
  • FIG. 4 is a lateral cross sectional view showing an example of the structure of a coil.
  • FIG. 5 is a lateral cross sectional view showing circle A shown in FIG. 4.
  • FIG. 1 is a vertical cross sectional view showing an example of the structure of a nonaqueous electrolyte battery according to the present invention.
  • the nonaqueous electrolyte battery 1 incorporates a spirally coil 5 constituted by, in a hermetic state, winding an elongated positive electrode 2 and an elongated negative electrode 3 through separators 4 a and 4 b.
  • the spirally coil 5 is accommodated in a battery can 6 .
  • the positive electrode 2 has a positive-electrode collector 7 having two sides on each of which a positive-electrode active material layer 8 is formed.
  • a positive electrode mix is prepared. It is preferable that the material for the positive electrode contain Li in a sufficiently large quantity.
  • a composite metal oxide and an interlayer compound containing Li are suitable materials, the composite metal oxide being composed of lithium expressed by, for example, LiMO 2 (where M is at least one type of a material selected from Co, Ni, Mn, Fe, Al, V and Ti) and transition metal.
  • the conductive material for imparting conductivity to the positive electrode and the binder for joining the material for the positive electrode to the positive electrode collector may be conventional materials.
  • the conductive material may be graphite or carbon black, while the binder may be made of fluororesin, such as polyvinylidene fluoride.
  • the positive electrode mix is dispersed in N-methyl-2-pyrolidone so as to be slurried.
  • the slurry positive-electrode mix is uniformly applied to each of the two surfaces of aluminum foil which will be formed into a positive-electrode collector 7 and which has a thickness of, for example 20 ⁇ m, and then it is dried.
  • a positive-electrode active material layer 8 is formed so that the positive electrode 2 is manufactured.
  • the positive electrode 2 has a positive-electrode-collector exposed portion 9 formed at a lengthwise directional end thereof.
  • the positive-electrode-collector exposed portion 9 has two surfaces on each of which the positive-electrode active material layer 8 is not formed so that the positive-electrode collector 7 is exposed.
  • the end portion formed into the positive-electrode-collector exposed portion 9 serves as an outer portion of the spirally coil 5 formed by the winding operation.
  • the positive-electrode-collector exposed portion 9 covers the spirally coil 5 at least one time. Assuming that the outer diameter of the spirally coil 5 is d, length L 1 of the positive-electrode-collector exposed portion 9 is ⁇ d or longer.
  • the negative electrode 3 incorporates the negative-electrode collector 10 which has two surfaces on each of which a negative-electrode active material 11 is formed.
  • the negative electrode 3 is manufactured by bonding, for example, metal lithium foil which serves as a negative-electrode active material 11 to copper foil which serves as the negative-electrode collector 10 and which has a thickness of, for example, 10 ⁇ m.
  • the negative electrode 3 may be a structure obtained by applying, to the negative-electrode collector 10 , a material for a negative electrode, which permits doping/dedoping of lithium ions, and the binder.
  • the material for the negative electrode may be, for example, a carbon material.
  • the carbon material is exemplified by thermal decomposition carbon, cokes (pitch cokes, needle cokes, petroleum cokes or the like), graphite, vitreous carbon, a calcinated organic polymer compound (a material obtained by calcinating phenol resin, furan resin or the like), carbon fiber and active carbon.
  • the material for the negative electrode may be crystalline or amorphous metal oxide which permits doping/dedoping of lithium ions, as well as the carbon material.
  • the binder for joining the material for the negative electrode to the negative-electrode collector may be a conventional material.
  • the binder may be fluororesin, such as polyvinylidene fluoride.
  • the negative electrode 3 has a negative-electrode-collector exposed portion 12 formed at a lengthwise directional end thereof.
  • the negative-electrode-collector exposed portion 12 has two surfaces on each of which the negative-electrode active material 1 is not formed so that the negative-electrode collector 10 is exposed.
  • the end portion formed into the negative-electrode-collector exposed portion 12 serves as an outer portion of the spirally coil 5 formed by the winding operation.
  • the negative-electrode-collector exposed portion 12 covers the spirally coil 5 at least one time. Assuming that the outer diameter of the spirally coil 5 is d, length L 2 of the negative-electrode-collector exposed portion 12 is ⁇ d or longer.
  • the spirally coil 5 is formed by spirally winding a member formed by stacking, in this sequential order, the positive electrode 2 , the separator 4 a, the negative electrode 3 and the separator 4 b.
  • Each of the separators 4 a and 4 b is made of an insulating material having a relatively high specific heat.
  • Each of the separators 4 a and 4 b is constituted by a finely-porous polypropylene film having a thickness of about 25 ⁇ m.
  • the separator is not limited particularly.
  • the separator may be woven fabrics, unwoven fabrics or a finely porous film made of synthetic resin or the like.
  • a finely-porous film made of polyolefin is a preferred material from viewpoints of realizing a required thickness, strength of the formed film and resistance of the film.
  • any one of a polyethylene finely-porous film, a polypropylene finely-porous film, a finely-porous film and their mixture may be employed.
  • FIG. 4 is a lateral cross sectional view showing an example of the structure of the spirally coil 5 .
  • FIG. 5 is an enlarged view showing circle A shown in FIG. 4.
  • the spirally coil 5 is covered with the positive-electrode-collector exposed portion 9 and the negative-electrode-collector exposed portion 12 one or more times. Moreover, the outermost portion of the spirally coil 5 is formed into the separator 4 b.
  • the negative electrode 3 of the spirally coil 5 is positioned outer than the positive electrode 2 . Moreover, it is preferable that the negative-electrode-collector exposed portion 12 covers the positive-electrode-collector exposed portion 9 . Since the negative electrode 3 is positioned outer than the positive electrode 2 , short circuit in the battery can be prevented as described later.
  • the nonaqueous electrolyte battery 1 has the structure that the spirally coil 5 is accommodated in the battery can 6 , as shown in FIG. 1.
  • an insulating plate 13 is inserted into the bottom of the battery can 6 made of, for example, iron and previously plated with nickel.
  • the spirally coil 5 is accommodated.
  • an end of a positive-electrode lead 15 made of, for example, aluminum is joined to the positive electrode 2 .
  • Another end of the positive-electrode lead 15 is electrically connected to a battery cover 17 through a current-interrupting thin plate 16 .
  • the current-interrupting thin plate 16 interrupts an electric current to correspond to the internal pressure of the battery.
  • the battery cover 17 and the positive electrode 2 are electrically conducted to each other so as to be formed into the external positive electrode of the nonaqueous electrolyte battery 1 .
  • the negative electrode 3 of the spirally coil 5 is positioned outer than the positive electrode 2 . Therefore, short circuit between the battery can 6 electrically conducted to the negative electrode 3 and the positive electrode 2 occurring in the battery can be prevented even if the separator 4 b which is the outermost element of the spirally coil 5 is curled up. As a result, the manufacturing yield can be improved.
  • a nonaqueous electrolyte is injected into the battery can 6 .
  • the nonaqueous electrolyte is prepared by dissolving LiPF 6 , which is an electrolyte, in mixed solvent prepared by mixing 50 vol % of propylene carbonate, which is organic solvent, and 50 vol % di-methoxyehtane.
  • the dissolving ratio with respect to the mixed solvent is 1 mol/l.
  • the organic solvent which is not limited particularly, is exemplified by propylene carbonate, ethylene carbonate, 1,2-dimethoxyethane, 1,2-diethoxyethane, diethylcarbonate, ⁇ -butyrolactone, tetrahydrofuran, 1,3-dioxolane, 4-methyl-1,3-dioxolane, diethylether, sulfolane, methylsulfolane, acetonitrile and propionitrile.
  • the foregoing material is used solely or two or more types of the materials are used as mixed solvent.
  • the electrolyte which is not limited particularly, is exemplified by LiClO 4 , LiAsF 6 , LiPF 6 , LiBF 4 , LiB (C 6 H 5 ) 4 , LiCl, LiBr, LiSO 3 CH 3 and LiSO 3 CF 3 .
  • the battery can 6 is crimped through an insulating sealing gasket 18 applied with asphalt so that the battery cover 17 is secured.
  • the cylindrical nonaqueous electrolyte battery 1 can be manufactured.
  • the nonaqueous electrolyte battery 1 has a center pin 19 which is connected to the positive-electrode lead 15 and the negative-electrode lead 14 .
  • a safety valve unit 20 for removing gas in the battery if the pressure in the battery is raised to a level higher than a predetermined level is provided for the nonaqueous electrolyte battery 1 .
  • a PTC (Positive Temperature Coefficient) device 21 for preventing rise in the temperature in the battery is provided for the nonaqueous electrolyte battery 1 .
  • the positive-electrode-collector exposed portion 9 and the negative-electrode-collector exposed portion 12 are, at the outer periphery of the spirally coil 5 , short-circuited initially.
  • the short circuit between the positive-electrode-collector exposed portion 9 and the negative-electrode-collector exposed portion 12 occurs at a position apart from the positive-electrode active material layer 8 and the negative-electrode active material 11 .
  • separators 4 a and 4 b each having a relatively high specific heat are disposed around the position at which the short circuit has taken place.
  • the positive-electrode-collector exposed portion 9 or that of the negative-electrode-collector exposed portion 12 cannot cover the spirally coil 5 one or more times. A state in which the spirally coil 5 is not covered by the positive-electrode-collector exposed portion 9 and the negative-electrode-collector exposed portion 12 one or more times will now be described.
  • the positive-electrode-collector exposed portion 9 or the negative-electrode-collector exposed portion 12 is provided for only one side, short circuit between the positive-electrode-collector exposed portion 9 and the negative-electrode-collector exposed portion 12 cannot be caused to take place at a position sufficiently apart from the active material for the electrode. Therefore, an adverse influence on the active material for the electrode cannot be minimized.
  • the electrode-collector exposed portions are disposed on the two sides of the electrodes and their lengths are made to be ⁇ d or longer.
  • the safety of the nonaqueous electrolyte battery 1 can furthermore be improved.
  • the present invention is not limited to this.
  • the present invention may be applied to a nonaqueous electrolyte battery as well as the lithium secondary battery.
  • Nonaqueous electrolyte batteries having the above-mentioned structure were manufactured so as to be subjected to pressure crush tests.
  • the positive-electrode mix was dispersed in N-methyl-2-pyrolidone so as to be slurried.
  • the slurry was uniformly applied to the two sides of aluminum foil which served as a positive electrode collector and which had a thickness of 20 ⁇ m. Then, the slurry was dried, and then aluminum foil was compressed and molded by a roll pressing machine. Thus, the positive electrode was manufactured.
  • the active material layer for the positive electrode was not formed on either of the two sides at an end of the positive electrode. Therefore, the positive-electrode-collector exposed portion in which the positive electrode collector was exposed was formed. The length of the positive-electrode-collector exposed portion was made to be ⁇ d.
  • the negative electrode was manufactured by applying metal lithium foil which was an active material for the negative electrode to copper foil which was a negative-electrode collector and which had a thickness of 10 ⁇ m.
  • the active material layer for the negative electrode was not formed on either of the two sides at an end of the negative electrode. Therefore, the negative-electrode-collector exposed portion in which the negative-electrode collector was exposed was formed. The length of the negative-electrode-collector exposed portion was made to be ⁇ d.
  • the positive electrode, the separator, the negative electrode and the separator were sequentially hermetically stacked in this sequential order. Then, the stacked structure was spirally wound plural times so that a coil was constituted.
  • the separator was made of finely-porous polypropylene film having a thickness of 25 ⁇ m.
  • an insulating plate is inserted into the bottom of a battery can previously plated with nickel and made of iron. Then, the above-mentioned coil was accommodated in the battery can. To collect electric currents of the negative electrode, an end of the negative-electrode lead was crimped to the negative electrode. Another end of the negative-electrode lead was welded to the battery can.
  • an end of a positive-electrode lead made of aluminum is joined to the positive electrode. Another end of the positive-electrode lead was electrically connected to the battery cover through a current-interrupting thin plate.
  • a nonaqueous electrolyte was injected into the battery can.
  • the nonaqueous electrolyte was prepared by dissolving LiPF 6 in mixed solvent prepared by mixing 50 vol % of propylene carbonate and 50 vol % di-methoxyehtane.
  • the dissolving ratio with respect to the mixed solvent was 1 mol/l.
  • the battery can was crimped through an insulating sealing gasket applied with asphalt so that the battery cover was secured.
  • a cylindrical nonaqueous electrolyte battery having a diameter of about 18 mm and a height of about 65 mm was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the length of each of the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion was made to be 2 ⁇ d. Thus, a nonaqueous electrolyte battery was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the positive-electrode-collector exposed portion was not provided for the positive electrode and the negative-electrode-collector exposed portion was not provided for the negative electrode. Thus, a nonaqueous electrolyte battery was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the positive-electrode-collector exposed portion was provided for only either side of the positive electrode. Thus, a nonaqueous electrolyte battery was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the negative-electrode-collector exposed portion was not provided for the negative electrode. Thus, a nonaqueous electrolyte battery was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the length of each of the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion was made to be 0.5 ⁇ d. Thus, a nonaqueous electrolyte battery was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the length of the positive-electrode-collector exposed portion was made to be 0.5 ⁇ d and that of the negative-electrode-collector exposed portion was made to be ⁇ d. Thus, a nonaqueous electrolyte battery was manufactured.
  • a process similar to that according to Example 1 was performed except for a structure that the length of the positive-electrode-collector exposed portion was made to be ⁇ d and that of the negative-electrode-collector exposed portion was made to be 0.5 ⁇ d. Thus, a nonaqueous electrolyte battery was manufactured.
  • a predetermined number of the thus-manufactured nonaqueous electrolyte batteries according to Examples 1 and 2 and Comparative Examples 1 to 7 were prepared.
  • Each of the nonaqueous electrolyte batteries were charged/discharged 100 cycles in a voltage range from 1.5 V to 3.0 V. Then, the nonaqueous electrolyte battery was charged to 3.0 V, and then a pressure crush test was performed.
  • the nonaqueous electrolyte batteries according to Comparative Examples 1 to 3 incorporated the electrodes having no electrode-collector exposed portion, only either of the electrodes provided with the electrode-collector exposed portion or an electrode having the electrode-collector exposed portion provided for either surface thereof.
  • a portion of the foregoing nonaqueous electrolyte batteries encountered damage, such as heat and/or smoke, of the overall bodies of the batteries.
  • nonaqueous electrolyte batteries according to Examples 1 and 2 and having the structure that the electrode-collector exposed portion was provided for each of the two sides of the two electrodes were free from damage, such as heat and/or smoke, of the overall bodies of the batteries.
  • the structure that the electrode-collector exposed portions were provided for the two sides of the two electrodes improved the safety of the nonaqueous electrolyte battery.
  • the nonaqueous electrolyte batteries according to Comparative Examples 1 and 5 to 7 each having the structure that the length of the electrode-collector exposed portion was shorter than ⁇ d encountered damage, such as heat and smoke, of the overall bodies of the batteries.
  • the nonaqueous electrolyte batteries according to Examples 1 and 2 each having the structure that the length of the electrode-collector exposed portion is longer than ⁇ d were free from any damage of the overall bodies of the batteries.
  • the nonaqueous electrolyte battery according to the present invention is structured such that short circuit takes place between the positive-electrode-collector exposed portion and the negative-electrode-collector exposed portion provided on the two sides of the electrodes. Therefore, heat can be diffused. As a result, any critical influence is not exerted on the active materials for the positive electrode and the negative electrode. Moreover, heat and smoke can be prevented.
  • the nonaqueous electrolyte battery according to the present invention has the structure that the electrode-collector exposed portions are provided for the two sides of the two electrodes. Moreover, the electrode-collector exposed portion covers the coil one or more times. Therefore, heat and smoke which are produced when the battery has been crushed can furthermore satisfactorily be prevented.

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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)
  • Inorganic Chemistry (AREA)
  • Secondary Cells (AREA)
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US09/249,502 1998-02-13 1999-02-12 Nonaqueous electrolyte battery Abandoned US20020006543A1 (en)

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US10/156,283 US7527892B2 (en) 1998-02-13 2002-05-28 Nonaqueous electrolyte battery having exposed electrode collector portions

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JP3182098A JPH11233149A (ja) 1998-02-13 1998-02-13 非水電解液電池
JPP10-031820 1998-02-13

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US20080026288A1 (en) * 2006-07-26 2008-01-31 Eveready Battery Company, Inc. Electrochemical cell with positive container
US20100273036A1 (en) * 2006-10-17 2010-10-28 Eveready Battery Company, Inc. Lithium-Iron Disulfide Cell Design with Core Reinforcement
US20170207494A1 (en) * 2016-01-19 2017-07-20 Gs Yuasa International Ltd. Negative electrode plate, energy storage device, method for manufacturing negative electrode plate, and method for manufacturing energy storage device

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EP2315300B1 (de) * 1999-09-30 2017-07-19 Sony Corporation Festelektrolytzelle
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JP5132206B2 (ja) * 2007-06-28 2013-01-30 三洋電機株式会社 非水電解質電池用セパレータの評価方法
JP7125658B2 (ja) * 2019-09-26 2022-08-25 トヨタ自動車株式会社 非水電解質二次電池
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US20030091893A1 (en) * 2001-10-18 2003-05-15 Quallion Llc Electrical battery assembly and method of manufacture
US7070881B2 (en) 2001-10-18 2006-07-04 Quallion Llc Electrical battery assembly and method of manufacture
US20060246346A1 (en) * 2001-10-18 2006-11-02 Clay Kishiyama Electrical battery assembly and method of manufacture
US7410726B2 (en) 2001-10-18 2008-08-12 Quallion Llc Electrical battery assembly and method of manufacture
US20080026288A1 (en) * 2006-07-26 2008-01-31 Eveready Battery Company, Inc. Electrochemical cell with positive container
US20100273036A1 (en) * 2006-10-17 2010-10-28 Eveready Battery Company, Inc. Lithium-Iron Disulfide Cell Design with Core Reinforcement
US20170207494A1 (en) * 2016-01-19 2017-07-20 Gs Yuasa International Ltd. Negative electrode plate, energy storage device, method for manufacturing negative electrode plate, and method for manufacturing energy storage device
US10511063B2 (en) * 2016-01-19 2019-12-17 Gs Yuasa International Ltd. Negative electrode plate, energy storage device, method for manufacturing negative electrode plate, and method for manufacturing energy storage device

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DE69937078D1 (de) 2007-10-25
KR19990072664A (ko) 1999-09-27
TW410486B (en) 2000-11-01
KR100321946B1 (ko) 2002-02-04
US7527892B2 (en) 2009-05-05
EP0936690B1 (de) 2007-09-12
JPH11233149A (ja) 1999-08-27
EP0936690A3 (de) 2004-01-21
CN1226755A (zh) 1999-08-25
DE69937078T2 (de) 2008-06-12
EP0936690A2 (de) 1999-08-18
US20020182484A1 (en) 2002-12-05

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