Abstract: The present disclosure provides an angular battery with enhanced protection of an electrode body. The present disclosure provides an angular battery including an electrode body and a battery case that accommodates the electrode body. The battery case is configured of a substantially U-shaped case body that has a rectangular bottom surface and a pair of long side surfaces provided integrally with the bottom surface and facing each other, and a substantially U-shaped lid body having an upper lid facing the bottom surface and a pair of short side surfaces provided integrally with the upper lid and facing each other. The electrode body is attached to the lid body. In the angular battery, the case body and the lid are joined to each other to form a state in which the electrode body is accommodated inside the battery case.

Abstract: A square battery includes a battery case containing therein an electrode body. The battery case includes a case main body having a square shape substantially in the form of a cuboid having an open side surface and a lid bonded to the case main body so as to close an opening of the case main body. The case main body includes a rectangular bottom surface portion, a pair of wider surface portions facing each other, and a pair of narrower surface portions facing each other. The wider surface portion and the narrower surface portion adjacent to each other are bonded together. In the opening of the case main body, an inner side of a corner portion between the wider surface portion and the narrower surface portion adjacent to each other has an R-shape, and an outer edge of the lid is welded to the inner side of the corner portion.

Abstract: The present disclosure provides a battery case that is formed by joining two battery case members to each other to improve the mechanical strength at a joined portion of the members. The battery case disclosed herein is a hexahedral box-shaped battery case including two rectangular wide faces, three rectangular side walls that are present between the two wide faces, and an opening part. The battery case is characterized in that the joined portion is included along the circumference (three sides) of the battery case.

Abstract: The present disclosure provides a method for manufacturing an angular battery having improved insertability of an electrode body. According to the present disclosure, there is provided a method for manufacturing an angular battery including a battery case that has a rectangular bottom surface and a pair of long side surfaces having, as one side thereof, a long side of the rectangular bottom surface and facing each other, and an electrode body that is accommodated in the battery case and wide surfaces facing the long side surfaces.

Abstract: The present disclosure provides an angular battery with enhanced protection of an electrode body. The present disclosure provides an angular battery including an electrode body and a battery case that accommodates the electrode body. The battery case is configured of a substantially U-shaped case body that has a rectangular bottom surface and a pair of long side surfaces provided integrally with the bottom surface and facing each other, and a substantially U-shaped lid body having an upper lid facing the bottom surface and a pair of short side surfaces provided integrally with the upper lid and facing each other. The electrode body is attached to the lid body. In the angular battery, the case body and the lid are joined to each other to form a state in which the electrode body is accommodated inside the battery case.

Abstract: An inspection method for a secondary battery according to the invention includes: a first aging treatment process for performing aging treatment on the secondary battery that has initially been charged at a first temperature; a first voltage measurement process; a second aging treatment process for performing the aging treatment on the secondary battery at a second temperature; a second voltage measurement process; a self-discharge amount computation process; a non-temperature dependent failure determination process for determining non-temperature dependent failure that does not depend on a relationship between a self-discharge amount and a temperature in accordance with the measured self-discharge amount; and a temperature dependent failure determination process for determining temperature dependent failure that depends on the relationship between the self-discharge amount and the temperature in accordance with the self-discharge amount, temperature dependency of which is suppressed.

Abstract: An inspection method of a secondary battery according to the present invention includes: a charging step of charging an inspection target cell to a predetermined voltage set in advance; a voltage drop amount calculation step of calculating an amount of a voltage drop due to discharge by discharging the inspection target cell at a voltage of not more than the predetermined voltage; a non-defective product determination step of determining that the inspection target cell is a non-defective product, when the voltage drop amount is a threshold or less; and an aging step of performing aging after the non-defective product determination step.

Abstract: An initial charging method for a lithium-ion battery according to this embodiment includes preparing a cell having a positive electrode, a negative electrode, and an electrolyte and charging the cell by using voltages based on the amount of change in a capacity of the cell per unit voltage as a specified voltage.

Abstract: An inspection method for a secondary battery according to the invention includes: a first aging treatment process for performing aging treatment on the secondary battery that has initially been charged at a first temperature; a first voltage measurement process; a second aging treatment process for performing the aging treatment on the secondary battery at a second temperature; a second voltage measurement process; a self-discharge amount computation process; a non-temperature dependent failure determination process for determining non-temperature dependent failure that does not depend on a relationship between a self-discharge amount and a temperature in accordance with the measured self-discharge amount; and a temperature dependent failure determination process for determining temperature dependent failure that depends on the relationship between the self-discharge amount and the temperature in accordance with the self-discharge amount, temperature dependency of which is suppressed.

Abstract: An inspection method of a secondary battery according to the present invention includes: a charging step of charging an inspection target cell to a predetermined voltage set in advance; a voltage drop amount calculation step of calculating an amount of a voltage drop due to discharge by discharging the inspection target cell at a voltage of not more than the predetermined voltage; a non-defective product determination step of determining that the inspection target cell is a non-defective product, when the voltage drop amount is a threshold or less; and an aging step of performing aging after the non-defective product determination step.

Abstract: An initial charging method for a lithium-ion battery according to this embodiment includes preparing a cell having a positive electrode, a negative electrode, and an electrolyte and charging the cell by using voltages based on the amount of change in a capacity of the cell per unit voltage as a specified voltage.