Abstract: A safety estimation device for batteries includes a parameter acquirer that acquires a design parameter of a battery, a calculator that calculates voltage behavior of the battery from the design parameter, based on a machine-learned logical model, and an outputter that outputs the voltage behavior as information about safety regarding heat generation of the battery.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode includes an opposing region that opposes the positive electrode with the separator disposed therebetween and a non-opposing region that does not oppose the positive electrode but opposes the separator. In the case that the discharge cut-off voltage of the nonaqueous electrolyte secondary battery is in the range of 2.5 V to 3.0 V, a part of the non-opposing region adjacent to a boundary between the opposing region and the non-opposing region has an electric potential plateau in the range of ?0.02 V to +0.02 V relative to a negative electrode potential in the opposing region.

Abstract: A safety estimation device for batteries includes a parameter acquirer that acquires a design parameter of a battery, a calculator that calculates voltage behavior of the battery from the design parameter, based on a machine-learned logical model, and an outputter that outputs the voltage behavior as information about safety regarding heat generation of the battery.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode including a positive electrode mix layer, a negative electrode including a negative electrode mix layer, and a nonaqueous electrolyte containing a nonaqueous solvent. A surface of the negative electrode mix layer is provided with grooves. The nonaqueous electrolyte contains 10 volume percent or more of a fluorinated solvent with respect to the volume of the nonaqueous solvent and has a viscosity (25° C.) of 3.50 mPa·s or more as measured with a differential pressure viscometer.

Abstract: This invention provides a lithium secondary battery which degrades less upon high-rate charge/discharge cycles (thus durable). The lithium secondary battery comprises positive electrode 10 having positive electrode active material layer 14, negative electrode 20 having negative electrode active material layer 24, organic porous material layer 32 placed between positive electrode active material layer 14 and negative electrode active material layer 24, inorganic porous material layer 34 placed between organic porous material layer 32 and negative electrode active material layer 24. Inorganic porous material layer 34 comprises an inorganic filler that does not store lithium at a potential higher than the lithium-storing potential of the negative electrode active material layer, and a Li absorber that irreversibly stores lithium at a potential higher than the lithium-storing potential.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode including a positive electrode mix layer, a negative electrode including a negative electrode mix layer, and a nonaqueous electrolyte containing a nonaqueous solvent. A surface of the negative electrode mix layer is provided with grooves. The nonaqueous electrolyte contains 10 volume percent or more of a fluorinated solvent with respect to the volume of the nonaqueous solvent and has a viscosity (25° C.) of 3.50 mPa·s or more as measured with a differential pressure viscometer.

Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The negative electrode includes an opposing region that opposes the positive electrode with the separator disposed therebetween and a non-opposing region that does not oppose the positive electrode but opposes the separator. In the case that the discharge cut-off voltage of the nonaqueous electrolyte secondary battery is in the range of 2.5 V to 3.0 V, a part of the non-opposing region adjacent to a boundary between the opposing region and the non-opposing region has an electric potential plateau in the range of ?0.02 V to +0.02 V relative to a negative electrode potential in the opposing region.

Abstract: The nonaqueous electrolyte secondary battery of the present invention includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode contains a positive electrode active material composed of a lithium-containing transition metal oxide having a layered crystal structure. The negative electrode contains a negative electrode active material composed of a Ti-based oxide and an additive composed of fluorinated carbon that reacts with lithium at a more noble potential as compared to the negative electrode active material. In the nonaqueous electrolyte secondary battery of the present invention, the battery voltage reaches a discharge cut-off voltage by a potential change in the negative electrode.

Abstract: A laminated battery provided with an electricity-producing element and an outer case. The electricity-producing element contains a positive electrode, a negative electrode, and an electrolyte. The outer case comprises two sheets of laminating film and includes the following: a containing section that contains the electricity-producing element; and a sealing section that is formed around the edge of the containing section by bonding the sheets of laminating film to each other. Corners are formed along the boundary between the containing section and the sealing section, and an adhesive resin layer in the sealing section is thicker in corner regions near the aforementioned corners than in other regions.

Abstract: A nonaqueous electrolyte secondary battery is provided with: a positive electrode; a negative electrode that contains lithium titanate; a separator that is interposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte that contains an electrolyte salt and a nonaqueous solvent. The nonaqueous solvent contains propylene carbonate, a chain carbonate A represented by general formula R1OCOOR2 (wherein each of R1 and R2 represents an alkyl group having 2 or more carbon atoms), and a chain carbonate B represented by general formula R3OCOOR4 (wherein R3 represents a methyl group and R4 represents an alkyl group). The volume fraction of the propylene carbonate in the nonaqueous solvent is within the range of 25-33% by volume; the volume fraction of the chain carbonate A in the nonaqueous solvent is within the range of 65-74% by volume; and the volume fraction of the chain carbonate B in the nonaqueous solvent is within the range of 1-10% by volume.

Abstract: A negative electrode-regulated non-aqueous electrolyte secondary battery comprises a negative electrode having a negative electrode active material layer, a positive electrode having a positive electrode active material layer, a separator interposed between the positive electrode and the negative electrode, and a non-aqueous electrolyte and stops charging as a result of the voltage drop of the negative electrode. In the non-aqueous electrolyte secondary battery, the size of the negative electrode active material layer is larger than the size of the positive electrode active material layer. The positive electrode active material layer contains a lithium-nickel composite oxide (A) represented by the general formula LiNixM1-xO2 (where 0.7?x<1 and M is one or more metals) and a lithium-nickel composite oxide (B) represented by the general formula LiNixCoyM1-x-yO2 (where 0<x?0.5, 0<y<1, and M is one or more metals except Co).

Abstract: A nonaqueous electrolyte secondary battery is provided with: a positive electrode; a negative electrode that contains lithium titanate; a separator that is interposed between the positive electrode and the negative electrode; and a nonaqueous electrolyte that contains an electrolyte salt and a nonaqueous solvent. The nonaqueous solvent contains propylene carbonate, a chain carbonate A represented by general formula R1OCOOR2 (wherein each of R1 and R2 represents an alkyl group having 2 or more carbon atoms), and a chain carbonate B represented by general formula R3OCOOR4 (wherein R3 represents a methyl group and R4 represents an alkyl group). The volume fraction of the propylene carbonate in the nonaqueous solvent is within the range of 25-33% by volume; the volume fraction of the chain carbonate A in the nonaqueous solvent is within the range of 65-74% by volume; and the volume fraction of the chain carbonate B in the nonaqueous solvent is within the range of 1-10% by volume.

Abstract: A laminated battery provided with an electricity-producing element and an outer case. The electricity-producing element contains a positive electrode, a negative electrode, and an electrolyte. The outer case comprises two sheets of laminating film and includes the following: a containing section that contains the electricity-producing element; and a sealing section that is formed around the edge of the containing section by bonding the sheets of laminating film to each other. Corners are formed along the boundary between the containing section and the sealing section, and an adhesive resin layer in the sealing section is thicker in corner regions near the aforementioned corners than in other regions.

Abstract: A negative electrode of a lithium secondary battery has a negative electrode active material including at least one element of silicon and tin. Capacities of the positive electrode and the negative electrode of the lithium secondary battery are set as follows. In a completely charged state of the lithium secondary battery charged by a predetermined charging method, the positive electrode active material and the negative electrode active material are in a first partially charged state, respectively. In a completely discharged state of the lithium secondary battery discharged by a predetermined discharging method, the negative electrode active material is in a second partially charged state.

Abstract: This invention provides a lithium secondary battery which degrades less upon high-rate charge/discharge cycles (thus durable). The lithium secondary battery comprises positive electrode 10 having positive electrode active material layer 14, negative electrode 20 having negative electrode active material layer 24, organic porous material layer 32 placed between positive electrode active material layer 14 and negative electrode active material layer 24, inorganic porous material layer 34 placed between organic porous material layer 32 and negative electrode active material layer 24. Inorganic porous material layer 34 comprises an inorganic filler that does not store lithium at a potential higher than the lithium-storing potential of the negative electrode active material layer, and a Li absorber that irreversibly stores lithium at a potential higher than the lithium storing potential.

Abstract: The nonaqueous electrolyte secondary battery of the present invention includes a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. The positive electrode contains a positive electrode active material composed of a lithium-containing transition metal oxide having a layered crystal structure. The negative electrode contains a negative electrode active material composed of a Ti-based oxide and an additive composed of fluorinated carbon that reacts with lithium at a more noble potential as compared to the negative electrode active material. In the nonaqueous electrolyte secondary battery of the present invention, the battery voltage reaches a discharge cut-off voltage by a potential change in the negative electrode.

Abstract: Disclosed is a non-aqueous electrolyte secondary battery comprising a positive electrode containing a nickel-containing lithium composite oxide, a negative electrode containing graphite, and a non-aqueous electrolyte. The cut-off voltage of charge of this non-aqueous electrolyte secondary battery is 4.25 to 4.6 V. The negative electrode contains an additive that reacts with lithium at a potential higher than the potential of graphite. The ratio A/B of a positive electrode capacity A based on the weight of the nickel-containing lithium composite oxide and the cut-off voltage of charge relative to a weight B of the graphite contained in a portion of a negative electrode material mixture layer opposing to a positive electrode material mixture layer is 300 to 340 mAh/g, and the irreversible capacity C of the positive electrode and the irreversible capacity D of the negative electrode in the portion opposing to the positive electrode satisfies C?D.

Abstract: A non-aqueous electrolyte secondary battery has at least negative electrode, a positive electrode, and a separator between the positive electrode and negative electrode. Negative electrode has columnar first negative electrode active materials that are discretely formed on the outer peripheral surface of negative electrode current collector in the winding direction and can reversibly insert and extract lithium ions, and columnar second negative electrode active materials discretely formed on the inner peripheral surface. The positive electrode has positive electrode mixture layers containing a positive electrode active material capable of reversibly inserting and extracting lithium ions, on both surfaces of a positive electrode current collector. The difference between the porosity generated between first negative electrode active materials in negative electrode and that generated between the second negative electrode active materials in winding is set within 1.1%.

Abstract: A portable power source system including a battery pack housing at least one secondary battery, wherein first and second internal terminals for connecting to a pair of external terminals are provided inside the battery pack, and two or more operations in different operating directions are required to connect the external terminals to the internal terminals. The battery pack includes external terminal inserting portions for inserting the external terminals, and the two or more operations include a first operation including inserting the external terminals into the external terminal inserting portions and a second operation in a direction different from that of the first operation.

Abstract: A portable power source system including a battery pack housing at least one secondary battery, wherein first and second internal terminals for connecting to a pair of external terminals are provided inside the battery pack, and two or more operations in different operating directions are required to connect the external terminals to the internal terminals. The battery pack includes external terminal inserting portions for inserting the external terminals, and the two or more operations include a first operation including inserting the external terminals into the external terminal inserting portions and a second operation in a direction different from that of the first operation.