Disclosed are a wound electrode assembly, and a method and manufacturing apparatus for manufacturing the wound electrode assembly. The wound electrode assembly includes an electrode sheet. The electrode sheet includes a winding ending section, the winding ending section is provided with a plurality of first tabs, the plurality of first tabs are laminated, and among the two adjacent first tabs, a width of the first tab close to a winding center of the wound electrode assembly is greater than a width of the first tab away from the winding center. Among the two adjacent first tabs, a width of the first tab close to the winding center is greater than a width of the first tab away from the winding center. After the winding ending section is wound, the amount of misalignment between the two adjacent first tabs is reduced.

Various arrangements for compressing a cylindrical battery cell are presented herein. The cylindrical battery cell may be wrapped in a buffer material. The buffer material may then be compressed using a compression mechanism. The buffer material may uniformly distribute pressure applied to the buffer material to a curved sidewall of the cylindrical battery cell.

A tape attachment apparatus includes a tape supply unit configured to provide a tape to be attached to a tip of an electrode roll, a tape attachment unit configured to attach the tape provided by the tape supply unit to the electrode roll, and a frame configured to allow the tape attachment unit to be mounted to the frame. A tape attachment process to prevent unwinding of the electrode roll is automatically performed.

An embodiment of the present disclosure provides a non-stop constant-speed efficient winding machine for separator, and relates to the technical field of lithium ion cell manufacturing. The non-stop constant-speed efficient winding machine for separator includes a base plate, an electrode feeding mechanism, a winding mechanism, a separator cutting mechanism, and a separator compounding mechanism. The winding mechanism includes a winding head and three winding needles rotatably provided on the winding head. By additionally providing the separator compounding mechanism between the electrode feeding mechanism and the winding mechanism, thermal compounding of the separator is realized, and through rolling separator cutting of the separator cutting mechanism, the separator cutting is realized. The winding needle located at the winding position can adsorb a separator end after the cutting, and wind the separator end on an outer circumferential surface of the corresponding winding needle.

Embodiments provide an electrode assembly, a battery cell, a battery, an electrical apparatus, and a manufacturing method and device. In those embodiments, the electrode assembly includes: an electrode plate, including a main portion and at least one protruding portion. The main portion includes a metal substrate and an active material layer coated on a surface of the metal substrate. The protruding portion is connected to the metal substrate. The metal substrate protrudes along a length direction of the electrode assembly. Along a thickness direction of the electrode assembly, a size of at least a part of the protruding portion is greater than a size of the metal substrate. The electrode assembly according to the Embodiments aims to solve a technical problem of severe heat emission of a tab.

An electrochemical cell includes a cell housing and an electrode assembly disposed in the cell housing. The electrode assembly includes an electrode pair that is arranged to form a winding having a polygonal spiral wound shape in which a radius of the corner portions of each turn of the winding is constant, regardless of the number of turns. In addition, a length of the linear portions of one turn of the winding is different than a length of the linear portions of another turn of the winding. Since each turn of the winding includes the corner portions having a desired radius, the volumetric efficiency of the electrode assembly including the winding within a cell housing is improved relative to some cells that use conventional windings. An apparatus and method of forming a polygonal spiral wound winding are disclosed.

The embodiments of the application provide an electrode assembly and a manufacturing method and manufacturing system therefor, a battery cell and a battery. The electrode assembly includes a negative pole piece and a positive pole piece, the negative pole piece and the positive pole piece are wound to form a winding structure including a bending region and a straight region. Both the negative pole piece and the positive pole piece include a plurality of bent portions located in the bent area and a plurality of straight portions located in the straight area. At least one of the bent portions of the positive pole piece is a first bent portion, and/or at least one of the bent portions of the negative pole piece is a second bent portion.

A tray assembly for loading a battery cap includes at least one first tray having a top surface, in which first grooves are provided, and a bottom surface, in which second grooves are provided, and at least one second tray having a top surface, in which third grooves are defined, and a bottom surface, in which fourth grooves are defined and disposed above or below the first tray. When the first tray is disposed above the second tray, each of the second grooves and each of the third grooves communicate with each other to provide a communication space. When the first tray is disposed below the second tray, each of the first grooves and each of the fourth grooves communicate with each other to provide a communication space. The battery cap is mounted in an erect state in the communication space provided by the first tray and the second tray.

A winding device includes a mandrel for winding the electrode laminate, the mandrel having a first end and a second end opposite the first end; a first rotation driver located at the first end of the mandrel to rotate the mandrel; and a second rotation driver located at the second end of the mandrel to rotate the mandrel.

Embodiments provide a battery cell, a battery, an electric apparatus, and a manufacturing method and system of battery cell. In those embodiments, the battery cell includes a housing, an electrode assembly, and an end cover assembly. The housing provides an opening. The electrode assembly is disposed in the housing. The electrode assembly includes a body portion and a tab. The tab extends from an end of the body portion to the opening. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator. The first electrode plate and the second electrode plate each have a coated area and an uncoated area. A part of the electrode assembly corresponding to the coated areas of the first electrode plate and the second electrode plate is the body portion. The uncoated area of the first electrode plate or the second electrode plate forms the tab.