Provided is a method for manufacturing an electrochemical device with which it is possible to solve a problem due to edge lifting occurring when an electrode terminal and an uncoated part are joined, and to inhibit an exterior container from being damaged from the inside. In a method for manufacturing an electrochemical device, an electrode assembly 17 that has two types of electrodes 2, 3 stacked with separators 4 interposed therebetween is accommodated in an exterior container, both electrodes 2, 3 having a coated part in which active material layers 10, 12 are formed on a collector 9, 11 and an uncoated part in which the active material layers 10, 12 are not formed. Said method includes a step for stacking and joining an electrode terminal and an aggregation of uncoated parts in which the two types of electrodes 2, 3 overlap each other by type, a step for pressing the joint between the electrode terminal and the aggregation of the uncoated parts after the joining step, and a step for accommodating the electrode assembly 17 in the exterior container, which comprises a flexible film, after the pressing step.

Method for manufacturing electrochemical device

To prevent generation of a hole penetrating an outer can when welding a lead to the outer can and to obtain a stable welding strength in a manufacturing method of a sealed battery.SOLUTION: A manufacturing method of a sealed battery includes a welding step of welding a negative electrode lead 26 to an outer can 50 by irradiating the negative electrode lead with an energy beam from the outside of the outer can. The welding step includes: a first irradiation step of irradiating a portion where the negative electrode lead 26 faces an internal side of the outer can via an inner surface, on an outer surface of the outer can, with a first energy beam which is controlled in such a manner that a first fusion part 56 which is a fusion mark is stored inside of the outer can; and a second irradiation step of irradiating the inside of a portion where the first fusion part is exposed, on the outer surface of the outer can with a second energy beam which is controlled in such a manner that a second fusion part which is a fusion mark is formed from the outer surface of the outer can to the inside of the negative electrode lead 26 after the first irradiation step.SELECTED DRAWING: Figure 1

Manufacturing method for sealed battery, and sealed battery

A method for producing an electrode assembly includes a step of ultrasonically welding an exposed portion where the surface of an electrode current collector is exposed and an electrode lead to each other. The ultrasonic welding is performed, while the exposed portion of the electrode current collector and the electrode lead are stacked on each other, with an ultrasonic horn pressed against a resin sheet disposed on the exposed portion or the electrode lead. The resin sheet includes a sheet base material and an adhesive layer formed on one surface of the base material and is bonded to a portion of the exposed portion that is to be in contact with the ultrasonic horn or to a portion of the electrode lead that is to be in contact with the ultrasonic horn.

Method for producing electrode assembly and method for producing nonaqueous electrolyte secondary battery

A method for manufacturing an electrode body is provided with a step of performing ultrasonic welding of an exposed part, for which the surface of an electrode collector is exposed, with an electrode lead. The ultrasonic welding is performed in a state with the exposed part of the electrode collector and the electrode lead overlapping, and an ultrasonic horn pressed against the exposed part or the electrode lead with a resin sheet interposed therebetween. The resin sheet has a sheet base material, and an adhesive layer formed on one surface of the base material, and is adhered to the portion of the exposed part or the electrode lead that the ultrasonic horn contacts.

Method for manufacturing electrode body, and method for manufacturing nonaqueous electrolyte secondary battery

The purpose of the present invention is to obtain a square-shaped secondary battery having high productivity and reliability. A secondary battery according to the present invention includes: a power storage element having a positive-electrode tab group consisting of a plurality of positive-electrode tabs and having a negative-electrode tab group consisting of a plurality of negative-electrode tabs, the positive-electrode tab group and the negative-electrode tab group projecting from an edge on one side; positive-electrode leads that are connected to the positive-electrode tab group; and negative-electrode leads that are connected to the negative-electrode tab group. The positive-electrode tab group and the negative-electrode tab group are disposed separately from each other, the positive-electrode tab group is sandwiched by the positive-electrode leads, and the negative-electrode tab group is sandwiched by the negative-electrode leads.

Square-shaped secondary battery

A battery includes a power generation component including a positive electrode, a negative electrode, and an electrolyte, and a battery case accommodating the power generation component. The negative electrode includes a first lead (17) having a single layer structure whose main component is nickel, and a second lead (18) having a layered structure including a Ni layer (18a) whose main component is nickel and a Cu layer (18b) whose main component is copper. The battery includes a layered portion (35) formed of the leads that are superposed such that the Ni layer (18a) of the second lead (18) faces the first lead (17). Part of the layered portion (35) is welded to an inner surface of the battery case with the first lead (17) at the layered portion (35) being disposed on a battery case side.

Battery and method of manufacturing battery

A sealed cell (20) includes an electrode body (22) and a bottomed cylindrical outer casing can (50) that accommodates the electrode body The outer casing can is formed by nickel-plated iron, and a lead connected to one of a cathode and an anode and the outer casing can are welded by a welding part (54) formed from the outside surface of the outer casing can toward the lead The welding part (54)is formed by traces of fusion and has a first layer (56) and a second layer (58) having a higher nickel concentration than the first layer (56) The first layer (56) is formed from the lead through tothe inside of the outer casing can, the second layer (58) is formed so as to adjoin the first layer (56) on the outside surface side of the outer casing can, and the whole of the first layer (56) iscovered with the second layer (58) when the welding part is viewed from the outside of the outer casing can

Sealed cell and method for manufacturing same

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Battery and method of manufacturing battery

Sealed cell and method for manufacturing same

Manufacturing method for sealed battery, and sealed battery