Patent ID: 11962043
Assignee: ZHUHAI COSMX BATTERY CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC H  B  Y | IPC B  H

Claim 9:
10. A manufacturing method of a battery, comprising:
providing electrodes, tabs and a separator, wherein each of the electrodes has a coating zone and an empty foil zone;
for each pair of an electrode and a tab, attaching the empty foil zone of the electrode to the tab; performing by using a laser welding device, pulse dot welding from a surface of the empty foil zone facing away from the tab to form a plurality of dot-shaped welding marks arranged at intervals; each of the dot-shaped welding marks comprising a concave part and an annular convex part surrounding a periphery of the concave part; a surface of the tab facing away from the empty foil zone has having no welding mark, wherein the plurality of dot-shaped welding marks are arranged in an array; and a number of the dot-shaped welding marks is between 150 and 800; and a minimum distance between a dot-shaped welding mark and the coating zone is larger than 1 mm; a height of the annular convex part is within 30 μm; a depth of the concave part is smaller than a sum of thicknesses of the empty foil zone and the tab; and a bottom surface of the concave part has a central convex part, and a height of the central convex part is smaller than a depth of the concave part;
processing the electrodes welded with the tabs and a separator together to form a battery cell; and
assembling the battery cell into a housing to form the battery.