Abstract: A method for manufacturing a lithium ion secondary battery, the lithium ion secondary battery including a positive electrode and a negative electrode disposed with a separator sandwiched therebetween and contained together with an electrolytic solution in an outer case including a flexible film, wherein the quantity of dissolved nitrogen in the electrolytic solution in injecting the electrolytic solution into the outer case is 100 ?g/mL or less.

Abstract: A control system for a lithium secondary battery measures a voltage V of a negative electrode that uses silicon oxide as a negative electrode active material, with respect to a lithium reference electrode and a discharge capacity Q of the lithium secondary battery during discharge of the lithium secondary battery; generates a V?dQ/dV curve representing a relationship between dQ/dV, which is a proportion of an amount of change dQ in the discharge capacity Q to an amount of change dV in the voltage V, and the voltage V; calculates an intensity ratio of two peaks appearing on the V?dQ/dV curve for two voltage values in the voltage V; and senses a state of the negative electrode utilizing the intensity ratio.

Abstract: The object of the present invention is to provide a battery pack that can reduce the thickness of the entire battery while ensuring that the film-packaged batteries adhere to each other. The battery pack of the present invention includes: film-packaged battery assembly 12 of multiple laminated film-packaged batteries 12, each film-packaged battery including power generation element 11 and film-wrapping 12 forming an interior space 13 that can house power generation element 11 along with electrolyte; and, at least one fixing member 3 that faces the side face of film-packaged battery assembly 2. Film wrapping 12 includes casing part 14 that forms interior space 13 and sealing part 15 that extends from casing part 14 to fixing member 3 to seal interior space 13. Sealing part 15 is inserted in slit 4 that is formed in fixing member 3 and that is fixed therein to fixing member 3.

Abstract: To provide a battery pack less subject to vibration, shock, or the like and stable in characteristics. A battery pack includes a unit battery obtained by accommodating, in a casing film, a battery element in which positive and negative electrodes are stacked via separators, the unit battery having a sealing portion obtained by sealing opposing synthetic resin layers formed on inner surface of the casing film; and a lithium ion secondary battery stacked body obtained by stacking a plurality of the unit batteries and winding a fixing tape therearound. A sealing surface of the sealing portion is substantially parallel to a unit battery stacking surface, and an end surface of the sealing portion is brought into contact with the fixing tape.

Abstract: A measurement unit (200) measures voltages and currents of battery cells (100). A battery control unit (400) calculates a present estimation value of a residual capacity of the battery cells (100) by integrating the currents. The voltages of the battery cells (100) are set to a reference voltage value V1 serving as a trigger of a process of correcting the estimation value of the residual capacity and an alarm voltage value Va which is a voltage higher than the reference voltage value. In addition, the battery control unit (400) continues discharge of all the battery cells (100), as it is, when an alarm condition in which a voltage of a minimum capacity cell is equal to or less than the alarm voltage value is not satisfied, and outputs a first signal when the voltage of the minimum capacity cell satisfies the alarm condition.

Abstract: A method for producing a negative electrode for a lithium ion battery comprising heat-treating a negative electrode active material layer that is placed on a negative electrode current collector and includes a carbon material as a negative electrode active material and a binder until dry, and placing the layer under a hydrogen-containing atmosphere.

Abstract: A lithium ion secondary battery including: a positive electrode including a positive electrode active material capable of intercalating and deintercalating a lithium ion; a negative electrode including a negative electrode active material capable of intercalating and deintercalating a lithium ion; and a non-aqueous electrolytic solution, wherein the positive electrode active material includes a Mn-based spinel-type composite oxide and an additional active material, and the content of the Mn-based spinel-type composite oxide based on the whole of the positive electrode active material is 60% by mass or less, and the negative electrode active material includes a first graphite particle containing natural graphite and a second graphite particle containing artificial graphite, and the content of the second graphite particle based on the sum total of the first graphite particle and the second graphite particle is in the range of 1 to 30% by mass.

Abstract: A graphite-based negative electrode active material including a first graphite particle being spheroidized and a second graphite particle having a roundness lower than the roundness of the first graphite particle, wherein the content of the second graphite particle based on the sum of the first graphite particle and the second graphite particle is in the range of 1 to 30% by mass, the ratio of a median particle diameter (D50) to a particle diameter at 5 cumulative % (D5), D50/D5, in a cumulative distribution of the first graphite particle is smaller than the ratio of a median particle diameter (D50) to a particle diameter at 5 cumulative % (D5), D50/D5, in a cumulative distribution of the second graphite particle, and the tap density in saturation of the particle mixture of the first graphite particle and the second graphite particle is higher than both the tap density in saturation of the first graphite particle and the tap density in saturation of the second graphite particle.

Abstract: An authenticator (5, 11) is compatible with a plurality of authentication systems to authenticate an external device connected with a connection terminal (OUT, ID), and the authenticator executes authentication processes by the plurality of authentication systems in order, and permits transfer of electric power between the external device and a secondary battery part (1) when any one of authentication processes is successful.

Abstract: A battery pack (10) includes a plurality of battery cells (100), a measurement unit (measurement unit (200)), and a battery control unit (battery control unit (400)). The plurality of battery cells 100 are connected in series to each other. The measurement unit (200) measures voltages of the battery cells (100). The battery control unit (400) controls discharge of the battery cells (100) on the basis of the voltages measured by the measurement unit (200). In addition, when the battery cells (100) perform the discharge, the battery control unit (400) specifies a minimum voltage cell in which the voltage is lowest on the basis of the voltages measured by the measurement unit (200). Further, before the minimum voltage cell is over-discharged, the battery control unit (400) outputs a first signal for reducing a discharge current in the discharge.

Abstract: Secondary battery 1 includes: battery electrode assembly 5 that has a quadrangular planar shape, and includes a positive electrode and a negative electrode laminated with a separator interposed therebetween; and an exterior container that is formed of flexible films 7, and contains battery electrode assembly 5. The exterior container has recessed emboss portion 8 that contains battery electrode assembly 5 therein. Four corners 4a of an outer peripheral portion of battery electrode assembly 5 are either folded to be contained inside emboss portion 8, or inserted between flexible films 7 outside emboss portion 8. A length of at least one side among four sides forming the quadrangular planar shape of battery electrode assembly 5 is shorter than an inner dimension of emboss portion 8 in the direction in which the one side extends.

Abstract: Provided is a battery pack that is unlikely to be affected by vibration, shock, or the like, and has stable characteristics. A battery pack includes a battery module 300 that is made by stacking battery holding bodies 200 on which film-covered batteries are placed with positive- and negative-electrode pull-out tabs being taken out from the same side in such a way that sides from which the positive- and negative-electrode pull-out tabs are pulled out are aligned with each other, wherein: an extension tab connected each of the tabs is pulled out from a battery holding body in such a way as to extend in a direction perpendicular to a direction of the pull-out tab and in a direction opposite to the other pull-out tab; and the extension tabs are each bent along a side surface in a direction perpendicular to a battery stacking surface, and are stacked up and electrically connected.

Abstract: To provide a lithium ion secondary battery that is less likely affected by vibration, shock, or the like. A stacked lithium ion secondary battery is characterized in that separators, which are stacked with positive and negative electrodes, are a flat bag or flat tube with at least one side of an outer periphery thereof intermittently heat-sealed; the heat-sealed side is provided with concave and convex portions made up of straight lines or curves or a combination of straight lines and curves; the outer periphery of the separator made with the concave and convex portions is positioned outside the outer periphery of the negative electrode along with the concave and convex portions; and the outer periphery of the negative electrode is positioned outside the outer periphery of the positive electrode housed in the bag-shape or tubular separator.

Abstract: Provided is a battery in which collector foil is unlikely to break. In a lithium-ion secondary battery, as for a distance from a connection section between a positive electrode tab and the positive electrode terminal to a boundary section between applying and non-applying sections of positive-electrode active material in a direction perpendicular to a stacking direction, compared with a reference positive electrode having the boundary section that is located farthest to the connection section by straight-line distance, a layer of a positive electrode that is stacked in such a way as to be farthest from the reference positive electrode has a smaller distance from a boundary of the applying and non-applying sections of the positive-electrode active material to a connection section with the positive electrode tab in a direction perpendicular to a stacking direction.

Abstract: A graphite-based active material including: a first composite particle including a first graphite core particle and a first non-graphite-based carbon material covering the surface of the first graphite core particle; and a second composite particle including a second graphite core particle and a second non-graphite-based carbon material covering the surface of the second graphite core particle, wherein the mass fraction of the second non-graphite-based carbon material in the second composite particle, mass fraction B, is 5% by mass or more and more than the mass fraction of the first non-graphite-based carbon material in the first composite particle, mass fraction A, and the proportion of the second composite particle to the total of the first composite particle and the second composite particle is 1% by mass or more.

Abstract: An exemplary embodiment provides a lithium ion secondary battery using a high energy type anode, which enables long-life operation thereof. A secondary battery according to an exemplary embodiment comprises an electrode element in which a cathode and an anode are oppositely disposed, an electrolytic solution, and an outer packaging body which encloses the electrode element and the electrolytic solution inside; wherein the anode is formed by binding an anode active material, which comprises carbon material (a) that can absorb and desorb a lithium ion, metal (b) that can be alloyed with lithium, and metal oxide (c) that can absorb and desorb a lithium ion, to an anode collector with an anode binder; and wherein the electrolytic solution comprises a liquid medium which is hard to generate carbon dioxide at a concentration of 10 to 80 vol %.

Abstract: There is provided a lithium ion battery having high flame retardancy and good cycle characteristics on a long-term basis.

Abstract: The purpose of the present invention is to provide a lithium-ion battery that exhibits excellent long-term life properties, does not suffer from rapid capacity degradation, and exhibits excellent charging/discharging characteristics in low-temperature environments. The present invention is directed to a negative electrode for a lithium ion battery, which comprises a negative electrode active material containing a graphite or an amorphous carbon, conductive additives containing a graphite, and a binder; and a lithium ion battery comprising this negative electrode. The negative electrode is characterized in that the negative electrode active material has a spherical or massive shape; the conductive additives have a platy shape; and part of an edge surface of the conductive additives contacts a surface of the negative electrode active material.

Abstract: A non-aqueous electrolyte secondary battery includes a negative electrode in which a negative electrode active material layer is formed on a negative electrode collector, and a positive electrode laminated on the negative electrode through a separator, in which a positive electrode active material layer is formed on a positive electrode collector. The positive electrode active material layer on a surface of a positive electrode tab drawn from the positive electrode collector has a region which extends in a drawing direction of the positive electrode tab, exceeding a leading end line of a vertically projected negative electrode active material layer opposed to the positive electrode active material layer and in which an existing amount of the positive electrode active material layer is reduced toward its leading end portion.

Abstract: A controller (130) reads out a voltage value correlated with the ambient temperature of a battery (200) measured by a temperature measurer (110) from a storage device (120), so that a charger (140) charges the battery (200) at the voltage value read out by the controller (130).