Abstract: A cylindrical lithium ion battery in which an electrode group formed by winding a positive electrode and a negative electrode is housed in a battery case is disclosed. A sealing plate seals an opening of the battery case. An insulating plate having a plurality of openings is provided on a side of the electrode group closer to the sealing plate. The plurality of openings include a first hole with a largest opening area, and a plurality of second holes with opening areas smaller than the opening area of the first hole. An opening ratio of the first hole is 12% or more and 40% or less; a sum of opening ratios of the second holes is 0.3% or more and 10% or less; and a total opening ratio of all the openings is 20% or more and 50% or less.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode 4 including a positive electrode current collector and a positive electrode mixture layer containing a positive electrode active material and a binder, the positive electrode mixture layer being provided on the positive electrode current collector; a negative electrode 5; a porous insulating layer 6 interposed between the positive electrode 4 and the negative electrode 5; and a nonaqueous electrolyte. The positive electrode 4 has a tensile extension percentage of equal to or higher than 3.0%. The positive electrode current collector is made of aluminium containing iron. In this manner, the tensile extension percentage of the positive electrode is increased without a decrease in capacity of the nonaqueous electrolyte secondary battery. Accordingly, even when the nonaqueous electrolyte secondary battery is destroyed by crush, occurrence of short-circuit in the nonaqueous electrolyte secondary battery can be suppressed.

Abstract: Disclosed is a non-aqueous electrolyte secondary battery including a positive electrode, a negative electrode, a non-aqueous electrolyte, and a battery case containing them. The negative electrode includes SiOx where 0.5<x<1.5, and a carbon material. The non-aqueous electrolyte includes a halogenated cyclic carbonate. A ratio of mass b of the halogenated cyclic carbonate included in the non-aqueous electrolyte to mass a of the SiOx included in the negative electrode satisfies 0.001<b/a<3. A percentage of the SiOx to the total of the SiOx and the carbon material included in the negative electrode is preferably more than or equal to 3 mass % and less than 40 mass %.

Abstract: Provided is a non-aqueous electrolyte secondary battery having a high capacity and an improved cycle life. The battery includes an electrode group and a non-aqueous electrolyte, and has a volume energy density of 650 Wh/L or more. The electrode group includes wound positive and negative electrodes with a separator interposed therebetween. The positive and negative electrodes each include a current collector and a material mixture layer adhering thereto. The positive and negative electrode material mixture layers each have a porosity Pp of 22% or less and porosity Pn of 25% or less. The ratio VE/VT of a volume VE of the electrolyte to a total VT of the pore volumes of the positive and negative electrode material mixture layers, and the separator is 1 to 1.5. The difference between contact angles CAp and CAn of the positive and negative electrodes with respect to the non-aqueous electrolyte is 23° or less.

Abstract: In a wound electrode group, a positive electrode 10 includes positive electrode active material layers formed on both surfaces of a band-like positive electrode current collector, and a negative electrode includes negative electrode active material layers on both surfaces of a band-like negative electrode current collector. Charge capacity of the negative electrode falls within a range of 83-99% of theoretical capacity of the negative electrode in a full charge state of a nonaqueous electrolyte secondary battery. An active material mass M1 per unit area of a negative electrode active material layer formed on an outer circumference of the negative electrode current collector, and an active material mass M2 per unit area of a negative electrode active material layer formed on an inner circumference satisfy a relational expression of M1/M2<(R1+t/2)/(R1?t/2), where the electrode group has an innermost diameter of R1, and the negative electrode has a thickness of t.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode (5), a negative electrode (6) and a porous insulation layer (7). The positive electrode (5) includes a positive electrode current collector (51) and a positive electrode mixture layer (52), and the negative electrode (6) includes a negative electrode current collector (61) and a negative electrode active material layer (62). After charging the nonaqueous electrolyte secondary battery, when a surface of the positive electrode mixture layer (52) and a surface of the negative electrode active material layer (62) are brought in contact with each other, terminals are provided, respectively, on the positive electrode current collector (51) and the negative electrode current collector (62) and a resistance value between the terminals is measured, the resistance value is 1.6 ?·cm2 or more.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode 4 including a positive electrode current collector and a positive electrode material mixture layer containing a positive electrode active material and a binder and provided on the positive electrode current collector; a negative electrode 5; a porous insulating layer 6 interposed between the positive electrode 4 and the negative electrode 5; and a nonaqueous electrolyte. The positive electrode current collector contains aluminium. The positive electrode current collector has an average crystal grain size of 1.0 ?m or more.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode 4 including a positive electrode current collector and a positive electrode mixture layer including a positive electrode active material and a binder, the positive electrode mixture layer being provided on the positive electrode current collector, a negative electrode 5, a porous insulating layer 6 interposed between the positive electrode 4 and the negative electrode 5, and a nonaqueous electrolyte. The tensile extension of the positive electrode 4 is equal to or higher than 3.0%. The charge end voltage in normal operation of the nonaqueous electrolyte secondary battery is equal to or higher than 4.3 V.

Abstract: A nonaqueous electrolyte secondary battery has a positive electrode including an active material of complex oxides capable of storing and emitting lithium ions, a negative electrode, a separator, and an electrolytic solution made of a nonaqueous solvent. A discharge curve of this battery when being discharged with a constant power has two or more points of step-like flections near the end of electrical discharge in a range of 5% to 20% of a discharge capacity thereof as determined from an initial discharge voltage in a state of full charge to a discharge-end voltage.

Abstract: A nonaqueous electrolyte secondary battery comprising a positive electrode 5, a negative electrode 6, a separator 7 and a nonaqueous electrolyte, wherein a material mixture layer containing an active material and a binder is formed on a surface of a current collector 51 of at least one of the positive electrode 5 and the negative electrode 6. The material mixture layer includes a first layer 52 and a second layer 53 which are different in volume ratio of the binder to the active material. The volume ratio (A) of the binder in the first layer 52 in contact with the surface of the current collector 51 is lower than the volume ratio (B) of the binder in the second layer 53.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode 4; a negative electrode 6; a separator 5; and a battery case 1 in which an electrode plate group 7 including the positive electrode 4 and the negative electrode 6 spirally wound or stacked with the separator 5 interposed therebetween is stored with an electrolyte. In the nonaqueous electrolyte secondary battery, after charging, when the separator 5 is removed to bring a surface of the positive electrode mixture layer and a surface of the negative electrode mixture layer in contact with each other, terminals are respectively provided on the positive electrode current collector and the negative electrode current collector and a resistance value between the terminals is measured, the resistance value is 1.6 ?·cm2 or more, and the battery case 1 is electrically insulated from the positive electrode 4 and the negative electrode 6.

Abstract: A nonaqueous electrolyte secondary battery includes an electrode group 8 including a positive electrode 4 including a positive electrode current collector 4A and a positive electrode active material formed on the positive electrode current collector 4A, a negative electrode 5 including a negative electrode current collector 5A and a negative electrode active material formed on the negative electrode current collector 5A, and a porous insulating layer 6, the electrode group 8 being formed by winding or stacking the positive electrode 4 and the negative electrode 5 with the porous insulating layer 6 interposed. The positive electrode 4 has a tensile extension equal to or higher than 3.0%. The porous insulating layer 6 is made of a material containing aramid resin. Hence, even when the nonaqueous electrolyte secondary battery is destroyed by crush, occurrence of an internal short circuit in the battery can be prevented, thereby suppressing abnormal heat generation caused by an internal short circuit.

Abstract: A discharge controller includes a secondary battery, a switch section for opening/closing a discharge path from the secondary battery to a load, a voltage detector for detecting a terminal voltage of the secondary battery, and a cut-off voltage control section for controlling the switch section to be opened when the terminal voltage as detected by the voltage detector is not more than a predetermined cut-off voltage of discharge VE, while measuring an amount of decrease per unit time of the terminal voltage as detected by the voltage detector to set the cut-off voltage of discharge VE to a lower voltage, for a larger amount of decrease per unit time of the terminal voltage as detected by the voltage detector.

Abstract: A nonaqueous electrolyte secondary battery includes: a positive electrode 1; and a negative electrode 2. When the battery is charged in an environment of 25° C. at a constant current of 0.7 C until a voltage value reaches 4.2 V, and is charged at a constant voltage of 4.2 V until a current value decreases to 0.05 C, capacity of the electrode per unit area is 3.5 mAh/cm2 to 7.0 mAh/cm2, both inclusive, and charge capacity of the negative electrode active material is 300 mAh/g to 330 mAh/g, both inclusive. Internal resistance of the battery is controlled in such a manner that the voltage value reaches 4.2 V when the battery is charged to 50% to 85%, both inclusive, of standard capacity in the environment of 25° C. at the constant current of 0.7 C.

Abstract: A nonaqueous electrolyte secondary battery includes an electrode group (8) including a positive electrode (4) in which a positive electrode material mixture layer (4B) is provided on a positive electrode current collector (4A), a negative electrode (5) in which a negative electrode material mixture layer (5B) is provided on a negative electrode current collector (5A), and a porous insulating film (6). The positive electrode (4) and the negative electrode (5) are wound with the porous insulating layer (6) interposed. The positive electrode material mixture layer (4B) is provided on at least one of opposite surfaces of the positive electrode current collector (4A) located inside in a radial direction of the electrode group (8). The positive electrode material mixture layer (4B) has a porosity of 20% or lower.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode (4), a negative electrode (5), a porous insulating layer (6), and a nonaqueous electrolyte. In the positive electrode (4), a positive electrode mixture layer (4B) is provided on at least one surface of a positive electrode current collector (4A). A tensile extension percentage of the positive electrode (4) is 3.0% or more. The positive electrode current collector (4A) contains iron. A porosity of the positive electrode mixture layer (4B) is 17% or less.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode 4 including a positive electrode current collector and a positive electrode mixture layer including a positive electrode active material and a binder, the positive electrode mixture layer being provided on the positive electrode current collector, a negative electrode 5, a porous insulating layer 6 interposed between the positive electrode 4 and the negative electrode 5, and a nonaqueous electrolyte. The tensile extension of the positive electrode 4 is equal to or higher than 3.0%. The charge end voltage in normal operation of the nonaqueous electrolyte secondary battery is equal to or higher than 4.3 V.

Abstract: Disclosed is an electrode used in a wound electrode assembly, the electrode including: a current collector; a first material mixture layer including a first active material, which is formed on one surface of the current collector; and a second material mixture layer including a second active material, which is formed on the other surface of the current collector. When an electrode assembly is assembled, the first material mixture layer is wound in a manner such that it is positioned on the outer side of the second material mixture layer. In a part corresponding to a predetermined region of a cross section of said electrode assembly perpendicular to the winding axis thereof, the radius of curvature of the predetermined region being 3.0×10?3 m or less, the capacity per unit volume of the first material mixture layer is higher than the capacity per unit volume of the second material mixture layer.

Abstract: A non-aqueous electrolyte battery has a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode has a high-capacity positive electrode portion with a plate area per capacity of smaller than 200 cm2/Ah, and a high-power positive electrode portion with a plate area per capacity of 200 cm2/Ah or larger. The non-aqueous electrolyte battery is advantageous in providing a battery, with use of a single kind of non-aqueous electrolyte battery, which simultaneously satisfies the requirements on high-capacity characteristics capable of performing a long-term continuous discharge, and on high-power characteristics capable of performing a pulse discharge at a large current, without using a hybrid power supply unit which has multiple kinds of batteries and requires a complex control system.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode (4), a negative electrode (5), and a porous insulating layer (6). The porous insulating layer (6) is provided between the positive electrode (4) and the negative electrode (5). A tensile extension percentage of the positive electrode (4) is 3% or more. In other words, a positive electrode current collector (4A) contains an aluminum particle whose average particle size is 1 ?m or more. A positive electrode mixture layer (4B) is provided on at least one surface of the positive electrode current collector (4A), and contains a positive electrode active material and an organic material whose melting point or softening point is higher than 200° C.