Abstract: In a lithium ion secondary battery element, a positive electrode and a negative electrode are overlapped on each other so that a positive electrode active material layer with a generally rectangular shape in the positive electrode and a negative electrode active material layer with a generally rectangular shape in the negative electrode are overlapped on each other substantially perfectly and a positive electrode active material non-applied part of the positive electrode and a negative electrode active material non-applied part of the negative electrode are positioned on opposing sides of the rectangle. A border part between the negative electrode active material applied part and the negative electrode active material non-applied part is positioned closer to a peripheral side of a negative electrode current collector than a peripheral part of a positive electrode current collector.

Abstract: A stacked battery includes: a power generation element in which a plurality of electrodes and a plurality of separators are alternately stacked; an exterior member in which the power generation element is accommodated together with an electrolytic solution; and a bonding portion configured to bond an outermost layer of the power generation element and an inner side of the exterior member, wherein when the power generation element is viewed in a plan view from a stacking direction in which the electrodes and the separators are stacked, the bonding portion is located outside an effective region contributing to power generation in the power generation element and has a shape in which an outer peripheral edge of the bonding portion is continuous over an entire circumference of the bonding portion.

Abstract: In a lithium ion secondary battery element, a positive electrode and a negative electrode are overlapped on each other so that a positive electrode active material layer with a generally rectangular shape in the positive electrode and a negative electrode active material layer with a generally rectangular shape in the negative electrode are overlapped on each other substantially perfectly and a positive electrode active material non-applied part of the positive electrode and a negative electrode active material non-applied part of the negative electrode are positioned on opposing sides of the rectangle. A border part between the negative electrode active material applied part and the negative electrode active material non-applied part is positioned closer to a peripheral side of a negative electrode current collector than a peripheral part of a positive electrode current collector.

Abstract: [Problem] Provided are a stacked battery capable of improving a volume energy density while maintaining impact resistance, and a battery module includes a stacked battery. [Solution] The stacked battery 100 includes a power generation element 40 in which a plurality of electrodes 10, 20 and a plurality of separators 30 are alternately stacked, an exterior member 50 configured to accommodate the power generation element, first bonding portions 61 configured to bond the electrodes and the separators, and second bonding portions 62 configured to bond outermost layers 40a of the power generation element and an inner side 50a of the exterior member. The exterior member includes a joint portion 52 where peripheral edge portions 51 of the exterior member are overlapped and joined.

Abstract: A stacked battery includes: a power generation element in which a plurality of electrodes and a plurality of separators are alternately stacked; an exterior member in which the power generation element is accommodated together with an electrolytic solution; and a bonding portion configured to bond an outermost layer of the power generation element and an inner side of the exterior member, wherein when the power generation element is viewed in a plan view from a stacking direction in which the electrodes and the separators are stacked, the bonding portion is located outside an effective region contributing to power generation in the power generation element and has a shape in which an outer peripheral edge of the bonding portion is continuous over an entire circumference of the bonding portion.

Abstract: A lithium ion secondary battery includes: an electrode multilayer body including a plurality of electrodes stacked with a plurality of separators interposed therebetween; and a package. An end of each of the plurality of separators of the electrode multilayer body housed in the package projects from each of the plurality of electrodes. The plurality of separators includes a first separator, and a second separator which is disposed inside of the first separator and whose projecting amount of an end is smaller than that of the first separator. The end of the first separator is in contact with an inner surface of the packaging film or an inner surface of the separator located outside of the first separator, the end of the first separator is curved further inside than a virtual extension plane of an outer surface of the second separator.

Abstract: Provided is a lithium ion secondary battery which is provided with an appropriate amount of electrolytic solution and which has a long lifetime. The lithium ion secondary battery is provided with: a power generating element including a positive electrode and a negative electrode which are laminated via a separator; an electrolytic solution; and a package in which the power generating element and the electrolytic solution are disposed. A thickness obtained by subtracting a thickness of the package from a thickness of the lithium ion secondary battery is not less than 1.05 times and not more than 1.15 times a thickness of the power generating element in a state in which the electrolytic solution is not included.

Abstract: A lithium ion secondary battery according to an embodiment of the present disclosure includes: a positive electrode extending along a first direction; a negative electrode extending along the first direction and disposed opposite to the positive electrode along a second direction orthogonal to the first direction; and a separator with a crosslinked structure, extending along the first direction and provided between the positive electrode and the negative electrode. The separator includes an opposite region opposite to the positive electrode and the negative electrode along the second direction, and a surplus region not opposite to the positive electrode and/or the negative electrode along the second direction, and the surplus region has lower porosity than the opposite region.

Abstract: A method for inspecting a battery, comprising: a first withstanding voltage determination step of housing an electrode laminate within a package and applying a first voltage between a positive electrode terminal and a negative electrode terminal to perform a first withstanding voltage determination in a state in which an electrolyte solution is not poured in the package; and a second withstanding voltage determination step of applying a second voltage which is higher than the first voltage between the positive electrode terminal or the negative electrode terminal and metallic layers of pair of laminate films to perform a second withstanding voltage determination in the state in which the electrolyte solution is not poured in the package.

Abstract: A secondary battery has a flat shape and houses a power generation element together with an electrolyte solution inside an exterior body. A terminal includes: a terminal main body including a nickel plane containing nickel on at least a surface thereof; an anticorrosive layer covering at least a part of the nickel plane that is more on the inside of the exterior body than a held portion; and a resin layer covering at least the held portion of a surface of the anticorrosive layer and having an internal extension portion extending from the held portion to the inside of the exterior body.

Abstract: Provided is a lithium ion secondary battery that includes a package housing a positive electrode, a negative electrode, a separator, and an electrolyte solution. In the lithium ion secondary battery: the package including a stack including a metal base material, an acid modified polypropylene layer, and a polypropylene layer stacked sequentially; the polypropylene layer forms an inner surface of the package; the package includes a heat-sealed portion and a non-sealed portion; and the thickness of one acid modified polypropylene layer included in the heat-sealed portion is smaller than a half of the thickness of the polypropylene layer included in the heat-sealed portion.

Abstract: A lithium ion secondary battery includes: an electrode multilayer body including a plurality of electrodes stacked with a plurality of separators interposed therebetween; and a package. An end of each of the plurality of separators of the electrode multilayer body housed in the package projects from each of the plurality of electrodes. The plurality of separators includes a first separator, and a second separator which is disposed inside of the first separator and whose projecting amount of an end is smaller than that of the first separator. The end of the first separator is in contact with an inner surface of the packaging film or an inner surface of the separator located outside of the first separator, the end of the first separator is curved further inside than a virtual extension plane of an outer surface of the second separator.

Abstract: A lithium ion secondary battery according to an embodiment of the present disclosure includes: a positive electrode extending along a first direction; a negative electrode extending along the first direction and disposed opposite to the positive electrode along a second direction orthogonal to the first direction; and a separator with a crosslinked structure, extending along the first direction and provided between the positive electrode and the negative electrode. The separator includes an opposite region opposite to the positive electrode and the negative electrode along the second direction, and a surplus region not opposite to the positive electrode and/or the negative electrode along the second direction, and the surplus region has lower porosity than the opposite region.

Abstract: A secondary battery has a flat shape and houses a power generation element together with an electrolyte solution inside an exterior body. A terminal includes: a terminal main body including a nickel plane containing nickel on at least a surface thereof; an anticorrosive layer covering at least a part of the nickel plane that is more on the inside of the exterior body than a held portion; and a resin layer covering at least the held portion of a surface of the anticorrosive layer and having an internal extension portion extending from the held portion to the inside of the exterior body.

Abstract: A method for inspecting a battery, comprising: a first withstanding voltage determination step of housing an electrode laminate within a package and applying a first voltage between a positive electrode terminal and a negative electrode terminal to perform a first withstanding voltage determination in a state in which an electrolyte solution is not poured in the package; and a second withstanding voltage determination step of applying a second voltage which is higher than the first voltage between the positive electrode terminal or the negative electrode terminal and metallic layers of pair of laminate films to perform a second withstanding voltage determination in the state in which the electrolyte solution is not poured in the package.