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

Claim 0:
1. A battery, comprising a housing and a battery cell accommodated in the housing, wherein
the battery cell comprises electrodes and tabs, wherein each of the electrodes comprises a current collector and an active material layer, the current collector comprises a coating zone coated with the active material layer and an empty foil zone not coated with the active material layer, an end of a tab overlaps the empty foil zone and the tab and the empty foil zone are fixedly connected by laser welding;
a surface of the empty foil zone facing away from the tab has a plurality of dot-shaped welding marks arranged at intervals, and each of the dot-shaped welding marks comprises a concave part and an annular convex part surrounding a periphery of the concave part; and
a surface of the tab facing away from the empty foil zone has 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;
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.