A method of manufacturing a secondary battery includes manufacturing an electrode assembly by winding a first electrode, a second electrode, and a separator together; attaching a tape to cover an outermost edge portion of the electrode assembly; accommodating the electrode assembly in a battery casing having an open end; and removing the tape attached to the electrode assembly from the electrode assembly. The tape includes a first portion attached to the electrode assembly, and a second portion extending from the first portion in a first direction towards the open end of the battery casing. In the removing the tape, the tape is removed by pulling the second portion.

According to the present disclosure, a secondary battery in which precipitation of metallic lithium can be inhibited more appropriately is provided. The secondary battery disclosed here includes a flat wound electrode body. The wound electrode body has a pair of curved portions and a flat portion. In addition, a positive electrode starting end portion inside the wound electrode body has a first region extending along the flat portion. On the other hand, a negative electrode starting end portion inside the wound electrode body has a second region extending along the flat portion, a folded portion folded back along a first curved portion, and a third region extending from the folded portion along the flat portion. In addition, in the wound electrode body, an electrode starting end stacked portion in which the first region, the second region, and the third region overlap each other is formed in a part of the flat portion, and a positive electrode terminating end portion and a negative electrode terminating end portion are disposed in the first curved portion. According to such a configuration, a local pressing failure and non-uniform heat generation distribution can be appropriately prevented, and the precipitation of metallic lithium can be inhibited.

A method of adhering a tape to a rechargeable battery is provided. The method includes contacting one surface of a rechargeable battery with an attachment surface of a tape via an attachment roller interposed therebetween, rotating the attachment roller in a first direction to adhere the tape to the one surface of the rechargeable battery maintaining a rotation of the attachment roller while moving the rechargeable battery in the direction away from the attachment roller to linearly contact the tape and one surface of the rechargeable battery and cutting the tape.

A notification determinator determines whether or not an inspection result of a winding body indicates defective on the basis of whether or not continuous positions of a first end surface and a second end surface indicated by first group data and second group data are separated from reference positions by a predetermined distance or more. In a case where the inspection result of the winding body indicates defective, a notification determinator performs a notification that inspection in an inspection machine is not performed normally, and outputs information indicating that a cause of the defect is a take-out chuck of an inspection machine or any of a plurality of winding cores to a display for maintenance.

An electrode assembly, a battery cell, a battery, and an electric device are described. The electrode assembly includes a first electrode plate, a second electrode plate, and a first insulation layer, the first electrode plate and the second electrode plate being wound to form the electrode assembly, where a winding terminating end of the first electrode plate exceeds a winding terminating end of the second electrode plate by at least half a turn so that the first electrode plate entirely covers an outer surface of an outermost turn of the second electrode plate, and the first insulation layer being applied on an outer surface of an outermost turn of the first electrode plate. According to this application, the terminating end of the first electrode plate is set to exceed the second electrode plate by at least half a turn.

Provided are a winding shaft, a cell manufacturing apparatus, and a cell manufacturing method. The winding shaft is used for winding plates and includes: a winding shaft body including a first winding surface; an adjustment member configured to be mounted to the winding shaft body and movable simultaneously in an axial direction of the winding shaft and in a radial direction of the winding shaft, where the adjustment member includes a second winding surface, and the first winding surface and the second winding surface are configured to wind the plates jointly; and an actuator configured to drive the adjustment member to move to change a relative position of the second winding surface with respect to the first winding surface, so as to change a winding circumference of the winding shaft. The winding shaft of the present application can reduce the possibility of or the amount of misalignment between the tabs.

According to the present disclosure, the breakage of an exterior body due to rising deformation of an electrode terminal can be prevented. The manufacturing method herein disclosed includes the steps of: bringing a lower surface of a terminal connecting part into contact with a first terminal, and bringing an upper surface of the terminal connecting part into contact with a second terminal; interposing the terminal connecting part, the first terminal, and the second terminal between a horn and an anvil, and carrying out ultrasonic welding; and accommodating the electrode body into the exterior body. Such a manufacturing method is characterized in that a width dimension of the horn is longer than a width dimension of the second terminal, and a width dimension of the anvil is longer than the width dimension of the second terminal. This can prevent rising deformation of the electrode terminal, and can prevent breakage of the exterior body by the deformed electrode terminal.

A deviation correction apparatus includes a width detecting apparatus configured to detect a width of a coating layer of an electrode plate, a processor communicatively connected with the width detecting apparatus and configured to determine a centerline position of the electrode plate based on the width of the coating layer, and a deviation correction mechanism configured to perform deviation correction for the electrode plate based on the centerline position of the electrode plate and a preset standard centerline position.

Provided are an electrode assembly, a method and system for manufacturing the same, a battery cell, a battery, and an electric apparatus. The electrode assembly includes an electrode member wound along a winding direction, the electrode member includes an electrode body, and the electrode body includes an insulating matrix and a conductive layer disposed on the insulating matrix; and the conductive layer includes a first part coated with an active substance layer and a second part coated with no active substance layer; the second part is provided in a quantity of N, and the N second parts are spaced apart in the winding direction; and in the winding direction, distance between the M.sup.th and (M-1).sup.th second parts is L1., and distance between the M.sup.th and (M+1).sup.th second parts is L2, where both N and M are positive integers, 2 ≤ M ≤ N-1, and 0.95 < L2/L1 < 1.05.

A method of manufacturing a dry electrode sheet for a secondary battery includes providing a dry electrode composition comprising an active electrode material and a binder, calendering the dry electrode composition with a calender roll and forming a first electrode sheet, cutting the first electrode sheet into two or more pieces, and laminating and then calendering the cut first electrode sheet.