Abstract: A highly reliable prismatic secondary battery with a current interruption mechanism that is unlikely to be damaged even if the battery is subjected to shock due to vibration, falling, etc. A second insulating member that has a through-hole is disposed between an inversion plate and the first region of a positive electrode collector, and through the through-hole the first region of the positive electrode collector is electrically connected to the inversion plat. First to third projections to formed around the through-hole formed in the second insulating member fit respectively into first to third openings formed in the first region of the positive electrode collector, and the diameters of their apexes are widened, thus forming first to third fixing portions. Thereby, the second insulating member is robustly joined to the first region of the positive electrode collector.

Abstract: Disclosed is a highly reliable prismatic secondary battery with a current interruption mechanism that is unlikely to be damaged even if the battery is subjected to shock due to vibration, falling, etc. A second insulating member that has a through-hole is disposed between an inversion plate and the first region of a positive electrode collector, and through the through-hole the first region of the positive electrode collector is electrically connected to the inversion plate. First to third projections to formed around the through-hole formed in the second insulating member fit respectively into first to third openings formed in the first region of the positive electrode collector, and the diameters of their apexes are widened, thus forming first to third fixing portions. Thereby, the second insulating member is robustly joined to the first region of the positive electrode collector.

Abstract: The positive electrode substrate exposed portions or the negative electrode substrate exposed portions, or both, of an electrode assembly is split into two groups, and therebetween is disposed an intermediate member made of a resin material and holding one or more connecting conductive members. Collector members for the substrate exposed portions split into two groups is electrically joined by a resistance welding method to the substrate exposed portions split into two groups, together with the connecting conductive member(s) of the intermediate member. The resin material portion of the intermediate member protrudes, in the extension direction of the substrate exposed portions split into two groups, beyond the ends of the substrate exposed portions split into two groups and the ends of the collector member to a prismatic outer can. This structure enables enhanced resistance between the substrate exposed portions and the collector member and curbs variation in the welding strength.

Abstract: A current interruption mechanism for prismatic secondary battery includes a tubular conductive member electrically connected to a positive electrode external terminal, an inversion plate, and a positive electrode collector connected to the inversion plate. The positive electrode collector has a first region that is parallel to a sealing body and a second region that is connected to a positive electrode plate. The boundaries between the first and second regions are disposed further outward than the inner surface of the tubular conductive member, and at least one of the edge portions, other than the boundaries between the first region and second region, is located further outward than the inner surface of the tubular portion of the conductive member. The current interruption mechanism is unlikely to be damaged even if the battery is subjected to shock due to vibration, falling, etc.

Abstract: A high-reliability prismatic secondary battery with a current interruption mechanism that is unlikely to be damaged even if the battery is subjected to shock is provided. The prismatic secondary battery includes a second insulating member having a first through-hole, the second insulating member being arranged between a first region of a positive electrode collector and an inversion plate. The first region of the positive electrode collector and the inversion plate are electrically connected to each other through the first through-hole. The second insulating member has a plurality of fixing pawl portions. The fixing pawl portions are hooked and fixed to a fixing portion formed on the outer surface side of the conductive member.

Abstract: The positive electrode substrate exposed portions or the negative electrode substrate exposed portions, or both, of an electrode assembly is split into two groups, and therebetween is disposed an intermediate member made of a resin material and holding one or more connecting conductive members. Collector members for the substrate exposed portions split into two groups is electrically joined by a resistance welding method to the substrate exposed portions split into two groups, together with the connecting conductive member(s) of the intermediate member. The resin material portion of the intermediate member protrudes, in the extension direction of the substrate exposed portions split into two groups, beyond the ends of the substrate exposed portions split into two groups and the ends of the collector member to a prismatic outer can. This structure enables enhanced resistance between the substrate exposed portions and the collector member and curbs variation in the welding strength.

Abstract: A prismatic nonaqueous electrolyte secondary battery includes a flat winding electrode assembly formed by winding an elongated positive and negative electrodes with an elongated separator interposed therebetween, and an outer body storing the flat winding electrode assembly and a nonaqueous electrolyte. The positive electrode includes a positive electrode substrate exposed portion formed along a longitudinal direction. The negative electrode includes a negative electrode substrate exposed portion formed along a longitudinal direction. The nonaqueous electrolyte contains at least one of a lithium salt having an oxalate complex as an anion and lithium difluorophosphate (LiPF2O2) at the time of making the nonaqueous electrolyte secondary battery. The flat winding electrode assembly has eight or more layers of a winding portion formed only of the separator in its central portion.

Abstract: In a prismatic sealed secondary battery provided with an outer can made of a metal, the ability of inserting the electrode assembly into the outer can is improved to restrain the displacement and damages of the insulation member when inserting the electrode assembly into the outer can. The prismatic sealed secondary battery of the present invention includes an insulation member having a bottomed box shape which is a shape obtained by eliminating the upper surface from the surfaces of a hexahedron having a cuboid form, wherein each width of at least a pair of side surfaces facing each other in the insulation member is smaller than the width of the electrode assembly facing the pair of side surfaces.

Abstract: A nonaqueous secondary battery includes a current cutoff mechanism that cuts off a current in a short period of time in response to a rise in pressure inside a battery outer body in at least one of a conductive path through which a current is taken out from a positive electrode plate to outside of the battery and a conductive path through which a current is taken out from a negative electrode plate to outside of the battery. At least one type selected from an oligomer containing a cyclohexyl group and a phenyl group, a modified product of the oligomer containing a cyclohexyl group and a phenyl group, a polymer containing a cyclohexyl group and a phenyl group, and a modified product of the polymer containing a cyclohexyl group and a phenyl group is present on the surface of the positive electrode plate.

Abstract: A nonaqueous electrolyte secondary battery includes: an electrode assembly including positive and negative electrode plates; a nonaqueous electrolyte; an outer body; and a current interruption mechanism being provided on at least one of a conductive pathway between the positive electrode plate and a positive electrode external terminal and a conductive pathway between the negative electrode plate and a negative electrode external terminal. The nonaqueous electrolyte contains an overcharge inhibitor. The positive electrode active material layer has a specific surface area of 1.3 m2/g or less. The positive electrode active material layer has a total surface area of 41 m2/g or less with respect to the total mass of the overcharge inhibitor in the nonaqueous electrolyte. Thus the battery can increase a battery internal pressure inside the outer body in a short period of time to activate the current interruption mechanism to interrupt the conductive pathway if the battery is overcharged.

Abstract: Disclosed is a non-aqueous electrolyte secondary cell excellent in capacity retention rate and I-V characteristics after repeated cycles. The secondary cell contains a negative electrode active material containing scaly graphite particles and coated graphite particles. The coated graphite particles contain graphite particles and a coating layer coating the surfaces of the graphite particles. The coating layer contains amorphous carbon particles and an amorphous carbon layer. It is preferable that the negative electrode active material contain 1 to 6% by mass of the scaly graphite particles and that the graphite particles, the amorphous carbon particles, and the amorphous carbon layer be in a mass ratio of 100:?:? where 1???10, 1???10, and ??1.34?.

Abstract: To provide a high-capacity non-aqueous electrolyte secondary battery with superior output characteristics and durability. The present invention is a non-aqueous electrolyte secondary battery including a negative electrode and a non-aqueous electrolyte, the non-aqueous electrolyte secondary battery characterized in that the non-aqueous electrolyte includes lithium bis(oxalato)borate, the negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core, and the negative electrode active material is graphite particles having a D90/D10 ratio of three or more, D10 being the 10% particle size and D90 being the 90% particle size in a cumulative particle size distribution of the volume standard of the graphite particles.

Abstract: To provide with high productivity a non-aqueous electrolyte secondary battery having high capacity and superior low temperature characteristics. The present invention is a non-aqueous electrolyte secondary battery including a positive electrode and a non-aqueous electrolyte containing a non-aqueous solvent, the non-aqueous electrolyte secondary battery characterized in that the non-aqueous solvent includes 30 to 70 vol % ethylene carbonate at 25° C. and 1 atm, the non-aqueous electrolyte includes a total of 0.01 to 0.10 mol/L lithium difluorophosphate and/or lithium monofluorophosphate, and the packing density of the positive electrode active material layer is from 2.0 to 2.8 g/ml.

Abstract: To provide with high productivity a non-aqueous electrolyte secondary battery having superior battery characteristics and a high capacity. The present invention is a non-aqueous electrolyte secondary battery including a battery assembly having a negative electrode, a positive electrode and a separator, as well as a non-aqueous electrolyte. In this non-aqueous electrolyte secondary battery, the non-aqueous electrolyte includes lithium bis(oxalato)borate, the negative electrode has a negative electrode core and a negative electrode active material layer formed on the negative electrode core, the packing density of the negative electrode active material layer is from 1.1 g/ml to 1.38 g/ml, and the battery capacity of the non-aqueous electrolyte secondary battery is equal to or greater than 21 Ah.

Abstract: A nonaqueous electrolyte secondary battery includes: a stacked electrode assembly formed by stacking a plurality of layers of a positive electrode plate and a plurality of layers of a negative electrode plate with a separator interposed therebetween; a nonaqueous electrolyte formed by dissolving LiPF6 at 1.5 mol/L into a mixed solvent of EC, EMC, and DMC; and an aluminum laminated outer body that stores the stacked electrode assembly and into which the electrolyte is poured. The ratio of the EC, the EMC, and the DMC is 36% by volume, 31% by volume, and 33% by volume, respectively, to the total amount of the mixed solvent. The nonaqueous electrolyte contains LiPF2O2.

Abstract: A nonaqueous electrolyte secondary battery according to an embodiment of the present invention includes an electrode assembly and a nonaqueous electrolyte. The electrode assembly is formed by winding a positive electrode, a negative electrode, and a separator. The negative electrode is opposed to the positive electrode. The separator is disposed between the positive electrode and the negative electrode. The capacity of the battery is not less than 4 Ah. The number of stacked layers of the positive electrode in a section that includes the center of the nonaqueous electrolyte secondary battery is not less than 50. The positive and negative electrode opposed capacity ratio is 1.1 to 1.4. The nonaqueous electrolyte contains lithium difluorophosphate.

Abstract: A stacked electrode assembly is arranged inside an aluminum laminated outer body. At least one of a positive electrode terminal and a negative electrode terminal satisfies Formula (1) below. A nonaqueous electrolyte contains LiBOB and/or a boron-containing substance derived from LiBOB. The battery has a capacity of 10 Ah or larger. The sectional area of the terminal (mm2)/a current value of 1.0 It (A)?0.

Abstract: To provide a non-aqueous electrolyte secondary battery having high capacity and superior safety and cycle characteristics. The present invention is a non-aqueous electrolyte secondary battery including an electrode assembly and a non-aqueous electrolyte, the electrode assembly having a positive electrode, a negative electrode and a separator separating the positive electrode and the negative electrode, the non-aqueous electrolyte secondary battery characterized in that the separator has a three-layer laminated structure, the melting point of the middle layer being lower than either of the two outer layers, and the non-aqueous electrolyte including lithium bis(oxalato)borate.

Abstract: In a prismatic nonaqueous electrolyte secondary battery, a flat winding electrode assembly and a nonaqueous electrolyte are housed in a prismatic outer body. A positive electrode includes a positive electrode substrate exposed portion formed along the longitudinal direction. A negative electrode includes a negative electrode substrate exposed portion formed along the longitudinal direction. The nonaqueous electrolyte contains a lithium salt having an oxalate complex as an anion at the time of making the nonaqueous electrolyte secondary battery. The area of the negative electrode substrate exposed portion is 700 cm2 or more. The area of the positive electrode substrate exposed portion is 500 cm2 or more. The area of the negative electrode substrate exposed portion is larger than the area of the positive electrode substrate exposed portion.

Abstract: To provide a high-capacity non-aqueous electrolyte secondary battery having superior cycle properties and safety. The present invention is a non-aqueous electrolyte secondary battery including electrode cores and a non-aqueous electrolyte containing a non-aqueous solvent, the positive electrode having a positive electrode active material layer formed on the positive electrode core, and the negative electrode having a negative electrode active material layer formed on the negative electrode core. In this non-aqueous electrolyte secondary battery, the non-aqueous solvent includes 25 to 40 vol % ethylene carbonate at 25° C.