Abstract: The present disclosure relates to the field of battery technologies, and more particularly, to a battery cell, a battery, an electric apparatus, a welding method, and a welding device. The battery cell includes: an end cover having an injection hole defined thereon; and a seal sealingly connected to the injection hole. A first weld segment and a second weld segment are formed between the seal and the end cover. An annular weld seam of the seal is formed by enclosing with at least a part of the first weld segment and at least a part of the second weld segment together. The first weld segment is formed by continuous laser light. The second weld segment is formed by pulsed laser light.

Abstract: This application relates to an end cover, an end cover assembly, a battery cell, a battery, and an electric apparatus. The end cover includes a cover body, the cover body having an electrolyte injection hole running through two sides in a thickness direction of the cover body, the electrolyte injection hole including a first hole section and a second hole section that are opened top-down in the thickness direction of the cover body, and the first hole section and the second hole section being connected at two ends in close proximity to each other. The first hole section is configured to accommodate an electrolyte injection nozzle, at least a part of a hole wall fits with an outer wall of the electrolyte injection nozzle to form an overflow prevention zone, and the overflow prevention zone is located above an electrolyte injection port in the electrolyte injection nozzle.

Abstract: Provided is an electrode plate, an electrode assembly, a battery cell, a battery, and an electric device. The electrode plate includes: a body portion having a surface at least partially coated with an active material; a tab portion arranged on at least one side of the body portion and connected to the body portion; and an opening penetrating the tab portion in a thickness direction of the tab portion. The opening has a first end and a second end that are sequentially arranged away from the body portion. The opening extends from the first end to the second end along a predetermined path. In the electrode plate of embodiments of the present disclosure, an occurrence of folding of the tab portion of the electrode plate during manufacturing can be reduced, avoiding an insufficient overcurrent area of the tab portion.

Abstract: A battery end cover assembly includes an end cover having a liquid injection hole penetrating along a first direction. The liquid injection hole includes a first hole segment and a second hole segment divided along the first direction; the cross-sectional area of the first hole segment is larger than the cross-sectional area of the second hole segment; a stepped surface is formed between the first hole segment and the second hole segment; and the stepped surface includes a first inclined surface inclined toward the second hole segment along the first direction.

Abstract: An end cap assembly includes an end cap, a first sealing member and a second sealing member. The end cap includes a cap body. The cap body includes a cap portion and a filling table, and has a filling hole penetrating the cap portion and the filling table. The first sealing member is blocked in the filling hole, and the second sealing member has a first sealing portion and a second sealing portion connected to each other. The first sealing portion covers the side of the first sealing member that faces away from the interior of the battery cell, the second sealing portion is bent toward the interior of the battery cell relative to the first sealing portion, and is sealingly connected to an outer peripheral side wall of the filling table.

Abstract: Provided are a battery cover plate assembly, including: a cover plate provided with a filling port; and a sealing pin for sealing the filling port; wherein the sealing pin includes a main body portion and a welding portion, and the welding portion is located at a periphery of the main body portion and extends from the main body portion toward an outer circumferential side; and the cover plate is provided with a second recess and a first recess, which are sequentially arranged from the inside to the outside at a periphery of the filling port, the main body portion is located in the second recess, and the welding portion is welded to a bottom surface of the first recess. According to the present application, the main body portion is located in the second recess, and the welding portion is welded to the bottom surface of the first recess.

Abstract: A tab welded structure includes a conductive member and a tab formed by stacking a plurality of layers of pieces in a first direction. The conductive member is welded to the tab to form a fused area. The fused area includes a first fused portion and a second fused portion. The first fused portion extends from the tab into the conductive member in the first direction. The second fused portion is demarcated from the first fused portion, the second fused portion is located at a side portion of the first fused portion, and the second fused portion is configured to be connected to the first fused portion and the tab.

Abstract: Embodiments provide a top cover assembly of a battery, a battery, and an electric apparatus, which can optimize the processing technology of batteries so as to improve the performance of batteries. The top cover assembly of the battery includes a top cover plate ; poles disposed on the top cover plate, each of which includes a first welding zone ; and adapting pieces configured to be electrically connected to the poles, where the adapting piece includes a second welding zone, and the second welding zone is configured to be correspondingly welded to the first welding zone to implement electrical connection; where both the first welding zone and the second welding zone are disposed obliquely with respect to a plane in which the top cover plate is located.

Abstract: 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.